loncom/lond - diff

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Diff for /loncom/lond between versions 1.198 and 1.531

-version 1.198, 2004/06/17 22:37:52
+version 1.531, 2017/02/07 18:14:13
  Line 31
  use strict;
  use lib '/home/httpd/lib/perl/';
+ use LONCAPA;
  use LONCAPA::Configuration;
+ use LONCAPA::Lond;
  use IO::Socket;
  use IO::File;
  #use Apache::File;
- use Symbol;
  use POSIX;
  use Crypt::IDEA;
- use LWP::UserAgent();
+ use HTTP::Request;
+ use Digest::MD5 qw(md5_hex);
  use GDBM_File;
- use Authen::Krb4;
  use Authen::Krb5;
- use lib '/home/httpd/lib/perl/';
  use localauth;
  use localenroll;
+ use localstudentphoto;
  use File::Copy;
- use LONCAPA::ConfigFileEdit;
+ use File::Find;
  use LONCAPA::lonlocal;
  use LONCAPA::lonssl;
+ use Fcntl qw(:flock);
+ use Apache::lonnet;
+ use Mail::Send;
+ use Crypt::Eksblowfish::Bcrypt;
+ use Digest::SHA;
+ use Encode;
+ use LONCAPA::LWPReq;
- my $DEBUG = 11;		       # Non zero to enable debug log entries.
+ my $DEBUG = 0;		       # Non zero to enable debug log entries.
  my $status='';
  my $lastlog='';
  my $VERSION='$Revision$'; #' stupid emacs
  my $remoteVERSION;
- my $currenthostid;
+ my $currenthostid="default";
  my $currentdomainid;
  my $client;
  my $clientip;			# IP address of client.
- my $clientdns;			# DNS name of client.
  my $clientname;			# LonCAPA name of client.
+ my $clientversion;              # LonCAPA version running on client.
+ my $clienthomedom;              # LonCAPA domain of homeID for client.
+ my $clientintdom;               # LonCAPA "internet domain" for client.
+ my $clientsameinst;             # LonCAPA "internet domain" same for
+                                 # this host and client.
+ my $clientremoteok;             # Client allowed to host domain's users.
+                                 # (version constraints ignored), not set
+                                 # if this host and client share "internet domain".
+ my %clientprohibited;           # Actions prohibited on client;
  my $server;
- my $thisserver;			# DNS of us.
  my $keymode;
+ my $cipher;			# Cipher key negotiated with client
+ my $tmpsnum = 0;		# Id of tmpputs.
  #
  #   Connection type is:
  #      client                   - All client actions are allowed
- Line 80  my $keymode;
+ Line 98  my $keymode;
  my $ConnectionType;
- my %hostid;			# ID's for hosts in cluster by ip.
- my %hostdom;			# LonCAPA domain for hosts in cluster.
- my %hostip;			# IPs for hosts in cluster.
- my %hostdns;			# ID's of hosts looked up by DNS name.
  my %managers;			# Ip -> manager names
  my %perlvar;			# Will have the apache conf defined perl vars.
+ my $dist;
+ #
+ #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
+ #    Each element of the hash contains a reference to an array that contains:
+ #          A reference to a sub that executes the request corresponding to the keyword.
+ #          A flag that is true if the request must be encoded to be acceptable.
+ #          A mask with bits as follows:
+ #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
+ #                      MANAGER_OK   - Set when the function is allowed to manager clients.
+ #
+ my $CLIENT_OK  = 1;
+ my $MANAGER_OK = 2;
+ my %Dispatcher;
  #
  #  The array below are password error strings."
  #
  my $lastpwderror    = 13;		# Largest error number from lcpasswd.
  my @passwderrors = ("ok",
- 		   "lcpasswd must be run as user 'www'",
+ 		   "pwchange_failure - lcpasswd must be run as user 'www'",
- 		   "lcpasswd got incorrect number of arguments",
+ 		   "pwchange_failure - lcpasswd got incorrect number of arguments",
- 		   "lcpasswd did not get the right nubmer of input text lines",
+ 		   "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
- 		   "lcpasswd too many simultaneous pwd changes in progress",
+ 		   "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
- 		   "lcpasswd User does not exist.",
+ 		   "pwchange_failure - lcpasswd User does not exist.",
- 		   "lcpasswd Incorrect current passwd",
+ 		   "pwchange_failure - lcpasswd Incorrect current passwd",
- 		   "lcpasswd Unable to su to root.",
+ 		   "pwchange_failure - lcpasswd Unable to su to root.",
- 		   "lcpasswd Cannot set new passwd.",
+ 		   "pwchange_failure - lcpasswd Cannot set new passwd.",
- 		   "lcpasswd Username has invalid characters",
+ 		   "pwchange_failure - lcpasswd Username has invalid characters",
- 		   "lcpasswd Invalid characters in password",
+ 		   "pwchange_failure - lcpasswd Invalid characters in password",
- 		    "11", "12",
+ 		   "pwchange_failure - lcpasswd User already exists",
- 		    "lcpasswd Password mismatch");
+                    "pwchange_failure - lcpasswd Something went wrong with user addition.",
+ 		   "pwchange_failure - lcpasswd Password mismatch",
+ 		   "pwchange_failure - lcpasswd Error filename is invalid");
- #  The array below are lcuseradd error strings.:
- my $lastadderror = 13;
+ # This array are the errors from lcinstallfile:
- my @adderrors    = ("ok",
- 		    "User ID mismatch, lcuseradd must run as user www",
+ my @installerrors = ("ok",
- 		    "lcuseradd Incorrect number of command line parameters must be 3",
+ 		     "Initial user id of client not that of www",
- 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
+ 		     "Usage error, not enough command line arguments",
- 		    "lcuseradd Too many other simultaneous pwd changes in progress",
+ 		     "Source filename does not exist",
- 		    "lcuseradd User does not exist",
+ 		     "Destination filename does not exist",
- 		    "lcuseradd Unable to make www member of users's group",
+ 		     "Some file operation failed",
- 		    "lcuseradd Unable to su to root",
+ 		     "Invalid table filename."
- 		    "lcuseradd Unable to set password",
+ 		     );
- 		    "lcuseradd Usrname has invalid characters",
- 		    "lcuseradd Password has an invalid character",
+ #
- 		    "lcuseradd User already exists",
+ # The %trust hash classifies commands according to type of trust
- 		    "lcuseradd Could not add user.",
+ # required for execution of the command.
- 		    "lcuseradd Password mismatch");
+ #
+ # When clients from a different institution request execution of a
+ # particular command, the trust settings for that institution set
+ # for this domain (or default domain for a multi-domain server) will
+ # be checked to see if running the command is allowed.
+ #
+ # Trust types which depend on the "Trust" domain configuration
+ # for the machine's default domain are:
+ #
+ # content   ("Access to this domain's content by others")
+ # shared    ("Access to other domain's content by this domain")
+ # enroll    ("Enrollment in this domain's courses by others")
+ # coaurem   ("Co-author roles for this domain's users elsewhere")
+ # domroles  ("Domain roles in this domain assignable to others")
+ # catalog   ("Course Catalog for this domain displayed elsewhere")
+ # reqcrs    ("Requests for creation of courses in this domain by others")
+ # msg       ("Users in other domains can send messages to this domain")
+ #
+ # Trust type which depends on the User Session Hosting (remote)
+ # domain configuration for machine's default domain is: "remote".
+ #
+ # Trust types which depend on contents of manager.tab in
+ # /home/httpd/lonTabs is: "manageronly".
+ #
+ # Trust type which requires client to share the same LON-CAPA
+ # "internet domain" (i.e., same institution as this server) is:
+ # "institutiononly".
+ #
+ my %trust = (
+                auth => {remote => 1},
+                autocreatepassword => {remote => 1},
+                autocrsreqchecks => {remote => 1, reqcrs => 1},
+                autocrsrequpdate => {remote => 1},
+                autocrsreqvalidation => {remote => 1},
+                autogetsections => {remote => 1},
+                autoinstcodedefaults => {remote => 1, catalog => 1},
+                autoinstcodeformat => {remote => 1, catalog => 1},
+                autonewcourse => {remote => 1, reqcrs => 1},
+                autophotocheck => {remote => 1, enroll => 1},
+                autophotochoice => {remote => 1},
+                autophotopermission => {remote => 1, enroll => 1},
+                autopossibleinstcodes => {remote => 1, reqcrs => 1},
+                autoretrieve => {remote => 1, enroll => 1, catalog => 1},
+                autorun => {remote => 1, enroll => 1, reqcrs => 1},
+                autovalidateclass_sec => {catalog => 1},
+                autovalidatecourse => {remote => 1, enroll => 1},
+                autovalidateinstcode => {domroles => 1, remote => 1, enroll => 1},
+                changeuserauth => {remote => 1, domroles => 1},
+                chatretr => {remote => 1, enroll => 1},
+                chatsend => {remote => 1, enroll => 1},
+                courseiddump => {remote => 1, domroles => 1, enroll => 1},
+                courseidput => {remote => 1, domroles => 1, enroll => 1},
+                courseidputhash => {remote => 1, domroles => 1, enroll => 1},
+                courselastaccess => {remote => 1, domroles => 1, enroll => 1},
+                currentauth => {remote => 1, domroles => 1, enroll => 1},
+                currentdump => {remote => 1, enroll => 1},
+                currentversion => {remote=> 1, content => 1},
+                dcmaildump => {remote => 1, domroles => 1},
+                dcmailput => {remote => 1, domroles => 1},
+                del => {remote => 1, domroles => 1, enroll => 1, content => 1},
+                deldom => {remote => 1, domroles => 1}, # not currently used
+                devalidatecache => {institutiononly => 1},
+                domroleput => {remote => 1, enroll => 1},
+                domrolesdump => {remote => 1, catalog => 1},
+                du => {remote => 1, enroll => 1},
+                du2 => {remote => 1, enroll => 1},
+                dump => {remote => 1, enroll => 1, domroles => 1},
+                edit => {institutiononly => 1},  #not used currently
+                eget => {remote => 1, domroles => 1, enroll => 1}, #not used currently
+                ekey => {}, #not used currently
+                exit => {anywhere => 1},
+                fetchuserfile => {remote => 1, enroll => 1},
+                get => {remote => 1, domroles => 1, enroll => 1},
+                getdom => {anywhere => 1},
+                home => {anywhere => 1},
+                iddel => {remote => 1, enroll => 1},
+                idget => {remote => 1, enroll => 1},
+                idput => {remote => 1, domroles => 1, enroll => 1},
+                inc => {remote => 1, enroll => 1},
+                init => {anywhere => 1},
+                inst_usertypes => {remote => 1, domroles => 1, enroll => 1},
+                instemailrules => {remote => 1, domroles => 1},
+                instidrulecheck => {remote => 1, domroles => 1,},
+                instidrules => {remote => 1, domroles => 1,},
+                instrulecheck => {remote => 1, enroll => 1, reqcrs => 1, domroles => 1},
+                instselfcreatecheck => {institutiononly => 1},
+                instuserrules => {remote => 1, enroll => 1, reqcrs => 1, domroles => 1},
+                keys => {remote => 1,},
+                load => {anywhere => 1},
+                log => {anywhere => 1},
+                ls => {remote => 1, enroll => 1, content => 1,},
+                ls2 => {remote => 1, enroll => 1, content => 1,},
+                ls3 => {remote => 1, enroll => 1, content => 1,},
+                makeuser => {remote => 1, enroll => 1, domroles => 1,},
+                mkdiruserfile => {remote => 1, enroll => 1,},
+                newput => {remote => 1, enroll => 1, reqcrs => 1, domroles => 1,},
+                passwd => {remote => 1},
+                ping => {anywhere => 1},
+                pong => {anywhere => 1},
+                pushfile => {manageronly => 1},
+                put => {remote => 1, enroll => 1, domroles => 1, msg => 1, content => 1, shared => 1},
+                putdom => {remote => 1, domroles => 1,},
+                putstore => {remote => 1, enroll => 1},
+                queryreply => {anywhere => 1},
+                querysend => {anywhere => 1},
+                quit => {anywhere => 1},
+                readlonnetglobal => {institutiononly => 1},
+                reinit => {manageronly => 1}, #not used currently
+                removeuserfile => {remote => 1, enroll => 1},
+                renameuserfile => {remote => 1,},
+                restore => {remote => 1, enroll => 1, reqcrs => 1,},
+                rolesdel => {remote => 1, enroll => 1, domroles => 1, coaurem => 1},
+                rolesput => {remote => 1, enroll => 1, domroles => 1, coaurem => 1},
+                servercerts => {institutiononly => 1},
+                serverdistarch => {anywhere => 1},
+                serverhomeID => {anywhere => 1},
+                serverloncaparev => {anywhere => 1},
+                servertimezone => {remote => 1, enroll => 1},
+                setannounce => {remote => 1, domroles => 1},
+                sethost => {anywhere => 1},
+                store => {remote => 1, enroll => 1, reqcrs => 1,},
+                studentphoto => {remote => 1, enroll => 1},
+                sub => {content => 1,},
+                tmpdel => {anywhere => 1},
+                tmpget => {anywhere => 1},
+                tmpput => {anywhere => 1},
+                tokenauthuserfile => {anywhere => 1},
+                unsub => {content => 1,},
+                update => {shared => 1},
+                updateclickers => {remote => 1},
+                userhassession => {anywhere => 1},
+                userload => {anywhere => 1},
+                version => {anywhere => 1}, #not used
+             );
+ #
+ #   Statistics that are maintained and dislayed in the status line.
+ #
+ my $Transactions = 0;		# Number of attempted transactions.
+ my $Failures     = 0;		# Number of transcations failed.
+ #   ResetStatistics:
+ #      Resets the statistics counters:
+ #
+ sub ResetStatistics {
+     $Transactions = 0;
+     $Failures     = 0;
+ }
  #------------------------------------------------------------------------
  #
- Line 141  my @adderrors    = ("ok",
+ Line 317  my @adderrors    = ("ok",
  #   $Socket      - Socket open on client.
  #   $initcmd     - The full text of the init command.
  #
- # Implicit inputs:
- #    $clientdns  - The DNS name of the remote client.
- #    $thisserver - Our DNS name.
- #
  # Returns:
  #     IDEA session key on success.
  #     undef on failure.
  #
  sub LocalConnection {
      my ($Socket, $initcmd) = @_;
-     Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
+     Debug("Attempting local connection: $initcmd client: $clientip");
-     if($clientdns ne $thisserver) {
+     if($clientip ne "127.0.0.1") {
  	&logthis('<font color="red"> LocalConnection rejecting non local: '
- 		 ."$clientdns ne $thisserver </font>");
+ 		 ."$clientip ne 127.0.0.1 </font>");
  	close $Socket;
  	return undef;
-     }
+     }  else {
-     else {
  	chomp($initcmd);	# Get rid of \n in filename.
  	my ($init, $type, $name) = split(/:/, $initcmd);
  	Debug(" Init command: $init $type $name ");
- Line 289  sub InsecureConnection {
+ Line 460  sub InsecureConnection {
      $answer    =~s/\W//g;
      if($challenge eq $answer) {
  	return 1;
-     }
+     } else {
-     else {
  	logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
  	&status("No challenge reqply");
  	return 0;
- Line 298  sub InsecureConnection {
+ Line 468  sub InsecureConnection {
  }
  #
+ #   Safely execute a command (as long as it's not a shel command and doesn
+ #   not require/rely on shell escapes.   The function operates by doing a
+ #   a pipe based fork and capturing stdout and stderr  from the pipe.
+ #
+ # Formal Parameters:
+ #     $line                    - A line of text to be executed as a command.
+ # Returns:
+ #     The output from that command.  If the output is multiline the caller
+ #     must know how to split up the output.
+ #
+ #
+ sub execute_command {
+     my ($line)    = @_;
+     my @words     = split(/\s/, $line);	# Bust the command up into words.
+     my $output    = "";
+     my $pid = open(CHILD, "-|");
+     if($pid) {			# Parent process
+ 	Debug("In parent process for execute_command");
+ 	my @data = <CHILD>;	# Read the child's outupt...
+ 	close CHILD;
+ 	foreach my $output_line (@data) {
+ 	    Debug("Adding $output_line");
+ 	    $output .= $output_line; # Presumably has a \n on it.
+ 	}
+     } else {			# Child process
+ 	close (STDERR);
+ 	open  (STDERR, ">&STDOUT");# Combine stderr, and stdout...
+ 	exec(@words);		# won't return.
+     }
+     return $output;
+ }
  #   GetCertificate: Given a transaction that requires a certificate,
  #   this function will extract the certificate from the transaction
  #   request.  Note that at this point, the only concept of a certificate
- Line 337  sub isClient {
+ Line 542  sub isClient {
  #                     - This allows dynamic changes to the manager table
  #                       without the need to signal to the lond.
  #
  sub ReadManagerTable {
+     &Debug("Reading manager table");
      #   Clean out the old table first..
     foreach my $key (keys %managers) {
- Line 348  sub ReadManagerTable {
+ Line 553  sub ReadManagerTable {
     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
     if (!open (MANAGERS, $tablename)) {
-       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
+        my $hostname = &Apache::lonnet::hostname($perlvar{'lonHostID'});
-       return;
+        if (&Apache::lonnet::is_LC_dns($hostname)) {
+            &logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
+        }
+        return;
     }
     while(my $host = <MANAGERS>) {
        chomp($host);
        if ($host =~ "^#") {                  # Comment line.
-          logthis('<font color="green"> Skipping line: '. "$host</font>\n");
           next;
        }
-       if (!defined $hostip{$host}) { # This is a non cluster member
+       if (!defined &Apache::lonnet::get_host_ip($host)) { # This is a non cluster member
  	    #  The entry is of the form:
  	    #    cluname:hostname
  	    #  cluname - A 'cluster hostname' is needed in order to negotiate
- Line 375  sub ReadManagerTable {
+ Line 582  sub ReadManagerTable {
           }
        } else {
           logthis('<font color="green"> existing host'." $host</font>\n");
-          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
+          $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if cluster memeber
        }
     }
  }
- Line 407  sub CopyFile {
+ Line 614  sub CopyFile {
      my ($oldfile, $newfile) = @_;
-     #  The file must exist:
+     if (! copy($oldfile,$newfile)) {
+         return 0;
-     if(-e $oldfile) {
- 	 # Read the old file.
- 	my $oldfh = IO::File->new("< $oldfile");
- 	if(!$oldfh) {
- 	    return 0;
- 	}
- 	my @contents = <$oldfh>;  # Suck in the entire file.
- 	# write the backup file:
- 	my $newfh = IO::File->new("> $newfile");
- 	if(!(defined $newfh)){
- 	    return 0;
- 	}
- 	my $lines = scalar @contents;
- 	for (my $i =0; $i < $lines; $i++) {
- 	    print $newfh ($contents[$i]);
- 	}
- 	$oldfh->close;
- 	$newfh->close;
- 	chmod(0660, $newfile);
- 	return 1;
-     } else {
- 	return 0;
      }
+     chmod(0660, $newfile);
+     return 1;
  }
  #
  #  Host files are passed out with externally visible host IPs.
- Line 464  sub AdjustHostContents {
+ Line 643  sub AdjustHostContents {
      my $adjusted;
      my $me        = $perlvar{'lonHostID'};
-  foreach my $line (split(/\n/,$contents)) {
+     foreach my $line (split(/\n/,$contents)) {
- 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
+ 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/) ||
+              ($line =~ /^\s*\^/))) {
  	    chomp($line);
  	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
  	    if ($id eq $me) {
-           my $ip = gethostbyname($name);
+ 		my $ip = gethostbyname($name);
-           my $ipnew = inet_ntoa($ip);
+ 		my $ipnew = inet_ntoa($ip);
-          $ip = $ipnew;
+ 		$ip = $ipnew;
  		#  Reconstruct the host line and append to adjusted:
- 		   my $newline = "$id:$domain:$role:$name:$ip";
+ 		my $newline = "$id:$domain:$role:$name:$ip";
- 		   if($maxcon ne "") { # Not all hosts have loncnew tuning params
+ 		if($maxcon ne "") { # Not all hosts have loncnew tuning params
- 		     $newline .= ":$maxcon:$idleto:$mincon";
+ 		    $newline .= ":$maxcon:$idleto:$mincon";
- 		   }
+ 		}
- 		   $adjusted .= $newline."\n";
+ 		$adjusted .= $newline."\n";
-       } else {		# Not me, pass unmodified.
+ 	    } else {		# Not me, pass unmodified.
- 		   $adjusted .= $line."\n";
+ 		$adjusted .= $line."\n";
-       }
+ 	    }
  	} else {                  # Blank or comment never re-written.
  	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
  	}
-  }
+     }
-  return $adjusted;
+     return $adjusted;
  }
  #
  #   InstallFile: Called to install an administrative file:
- #       - The file is created with <name>.tmp
+ #       - The file is created int a temp directory called <name>.tmp
- #       - The <name>.tmp file is then mv'd to <name>
+ #       - lcinstall file is called to install the file.
- #   This lugubrious procedure is done to ensure that we are never without
+ #         since the web app has no direct write access to the table directory
- #   a valid, even if dated, version of the file regardless of who crashes
- #   and when the crash occurs.
  #
  #  Parameters:
  #       Name of the file
- Line 503  sub AdjustHostContents {
+ Line 681  sub AdjustHostContents {
  #  Return:
  #      nonzero - success.
  #      0       - failure and $! has an errno.
+ # Assumptions:
+ #    File installtion is a relatively infrequent
  #
  sub InstallFile {
      my ($Filename, $Contents) = @_;
-     my $TempFile = $Filename.".tmp";
+ #     my $TempFile = $Filename.".tmp";
+     my $exedir = $perlvar{'lonDaemons'};
+     my $tmpdir = $exedir.'/tmp/';
+     my $TempFile = $tmpdir."TempTableFile.tmp";
      #  Open the file for write:
- Line 521  sub InstallFile {
+ Line 704  sub InstallFile {
      print $fh ($Contents);
      $fh->close;			# In case we ever have a filesystem w. locking
-     chmod(0660, $TempFile);
+     chmod(0664, $TempFile);	# Everyone can write it.
-     # Now we can move install the file in position.
+     # Use lcinstall file to put the file in the table directory...
-     move($TempFile, $Filename);
+     &Debug("Opening pipe to $exedir/lcinstallfile $TempFile $Filename");
+     my $pf = IO::File->new("| $exedir/lcinstallfile   $TempFile $Filename > $exedir/logs/lcinstallfile.log");
+     close $pf;
+     my $err = $?;
+     &Debug("Status is $err");
+     if ($err != 0) {
+ 	my $msg = $err;
+ 	if ($err < @installerrors) {
+ 	    $msg = $installerrors[$err];
+ 	}
+ 	&logthis("Install failed for table file $Filename : $msg");
+ 	return 0;
+     }
+     # Remove the temp file:
+     unlink($TempFile);
      return 1;
  }
- Line 533  sub InstallFile {
+ Line 732  sub InstallFile {
  #
  #   ConfigFileFromSelector: converts a configuration file selector
- #                 (one of host or domain at this point) into a
+ #                 into a configuration file pathname.
- #                 configuration file pathname.
+ #                 Supports the following file selectors:
+ #                 hosts, domain, dns_hosts, dns_domain
+ #
  #
  #  Parameters:
  #      selector  - Configuration file selector.
- Line 546  sub ConfigFileFromSelector {
+ Line 747  sub ConfigFileFromSelector {
      my $tablefile;
      my $tabledir = $perlvar{'lonTabDir'}.'/';
-     if ($selector eq "hosts") {
+     if (($selector eq "hosts") || ($selector eq "domain") ||
- 	$tablefile = $tabledir."hosts.tab";
+         ($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
-     } elsif ($selector eq "domain") {
+ 	$tablefile =  $tabledir.$selector.'.tab';
- 	$tablefile = $tabledir."domain.tab";
-     } else {
- 	return undef;
      }
      return $tablefile;
  }
  #
  #   PushFile:  Called to do an administrative push of a file.
- Line 572  sub ConfigFileFromSelector {
+ Line 769  sub ConfigFileFromSelector {
  #     String to send to client ("ok" or "refused" if bad file).
  #
  sub PushFile {
      my $request = shift;
      my ($command, $filename, $contents) = split(":", $request, 3);
+     &Debug("PushFile");
      #  At this point in time, pushes for only the following tables are
      #  supported:
      #   hosts.tab  ($filename eq host).
      #   domain.tab ($filename eq domain).
+     #   dns_hosts.tab ($filename eq dns_host).
+     #   dns_domain.tab ($filename eq dns_domain).
      # Construct the destination filename or reject the request.
      #
      # lonManage is supposed to ensure this, however this session could be
- Line 590  sub PushFile {
+ Line 790  sub PushFile {
      if(! (defined $tablefile)) {
  	return "refused";
      }
-     #
-     # >copy< the old table to the backup table
-     #        don't rename in case system crashes/reboots etc. in the time
-     #        window between a rename and write.
-     #
-     my $backupfile = $tablefile;
-     $backupfile    =~ s/\.tab$/.old/;
-     if(!CopyFile($tablefile, $backupfile)) {
- 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
- 	return "error:$!";
-     }
-     &logthis('<font color="green"> Pushfile: backed up '
- 	    .$tablefile." to $backupfile</font>");
      #  If the file being pushed is the host file, we adjust the entry for ourself so that the
      #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
      #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a
- Line 612  sub PushFile {
+ Line 799  sub PushFile {
      if($filename eq "host") {
  	$contents = AdjustHostContents($contents);
+     } elsif ($filename eq 'dns_host' || $filename eq 'dns_domain') {
+         if ($contents eq '') {
+             &logthis('<font color="red"> Pushfile: unable to install '
+                     .$tablefile." - no data received from push. </font>");
+             return 'error: push had no data';
+         }
+         if (&Apache::lonnet::get_host_ip($clientname)) {
+             my $clienthost = &Apache::lonnet::hostname($clientname);
+             if ($managers{$clientip} eq $clientname) {
+                 my $clientprotocol = $Apache::lonnet::protocol{$clientname};
+                 $clientprotocol = 'http' if ($clientprotocol ne 'https');
+                 my $url = '/adm/'.$filename;
+                 $url =~ s{_}{/};
+                 my $request=new HTTP::Request('GET',"$clientprotocol://$clienthost$url");
+                 my $response = LONCAPA::LWPReq::makerequest($clientname,$request,'',\%perlvar,60,0);
+                 if ($response->is_error()) {
+                     &logthis('<font color="red"> Pushfile: unable to install '
+                             .$tablefile." - error attempting to pull data. </font>");
+                     return 'error: pull failed';
+                 } else {
+                     my $result = $response->content;
+                     chomp($result);
+                     unless ($result eq $contents) {
+                         &logthis('<font color="red"> Pushfile: unable to install '
+                                 .$tablefile." - pushed data and pulled data differ. </font>");
+                         my $pushleng = length($contents);
+                         my $pullleng = length($result);
+                         if ($pushleng != $pullleng) {
+                             return "error: $pushleng vs $pullleng bytes";
+                         } else {
+                             return "error: mismatch push and pull";
+                         }
+                     }
+                 }
+             }
+         }
      }
      #  Install the new file:
+     &logthis("Installing new $tablefile contents:\n$contents");
      if(!InstallFile($tablefile, $contents)) {
  	&logthis('<font color="red"> Pushfile: unable to install '
  	 .$tablefile." $! </font>");
  	return "error:$!";
-     }
+     } else {
-     else {
  	&logthis('<font color="green"> Installed new '.$tablefile
- 		 ."</font>");
+ 		 ." - transaction by: $clientname ($clientip)</font>");
+         my $adminmail = $perlvar{'lonAdmEMail'};
+         my $admindom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
+         if ($admindom ne '') {
+             my %domconfig =
+                 &Apache::lonnet::get_dom('configuration',['contacts'],$admindom);
+             if (ref($domconfig{'contacts'}) eq 'HASH') {
+                 if ($domconfig{'contacts'}{'adminemail'} ne '') {
+                     $adminmail = $domconfig{'contacts'}{'adminemail'};
+                 }
+             }
+         }
+         if ($adminmail =~ /^[^\@]+\@[^\@]+$/) {
+             my $msg = new Mail::Send;
+             $msg->to($adminmail);
+             $msg->subject('LON-CAPA DNS update on '.$perlvar{'lonHostID'});
+             $msg->add('Content-type','text/plain; charset=UTF-8');
+             if (my $fh = $msg->open()) {
+                 print $fh 'Update to '.$tablefile.' from Cluster Manager '.
+                           "$clientname ($clientip)\n";
+                 $fh->close;
+             }
+         }
      }
      #  Indicate success:
      return "ok";
- Line 797  sub AdjustOurHost {
+ Line 1040  sub AdjustOurHost {
      #   Use the config line to get my hostname.
      #   Use gethostbyname to translate that into an IP address.
      #
-     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
+     my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
-     my $BinaryIp = gethostbyname($name);
-     my $ip       = inet_ntoa($ip);
      #
      #  Reassemble the config line from the elements in the list.
      #  Note that if the loncnew items were not present before, they will
      #  be now even if they would be empty
      #
      my $newConfigLine = $id;
-     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
+     foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) {
  	$newConfigLine .= ":".$item;
      }
      #  Replace the line:
- Line 852  sub EditFile {
+ Line 1093  sub EditFile {
      #  Split the command into it's pieces:  edit:filetype:script
-     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
+     my ($cmd, $filetype, $script) = split(/:/, $request,3);	# : in script
      #  Check the pre-coditions for success:
-     if($request != "edit") {	# Something is amiss afoot alack.
+     if($cmd != "edit") {	# Something is amiss afoot alack.
  	return "error:edit request detected, but request != 'edit'\n";
      }
      if( ($filetype ne "hosts")  &&
- Line 900  sub EditFile {
+ Line 1141  sub EditFile {
      return "ok\n";
  }
+ #   read_profile
  #
- #  Convert an error return code from lcpasswd to a string value.
+ #   Returns a set of specific entries from a user's profile file.
+ #   this is a utility function that is used by both get_profile_entry and
+ #   get_profile_entry_encrypted.
  #
- sub lcpasswdstrerror {
+ # Parameters:
-     my $ErrorCode = shift;
+ #    udom       - Domain in which the user exists.
-     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
+ #    uname      - User's account name (loncapa account)
- 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
+ #    namespace  - The profile namespace to open.
+ #    what       - A set of & separated queries.
+ # Returns:
+ #    If all ok: - The string that needs to be shipped back to the user.
+ #    If failure - A string that starts with error: followed by the failure
+ #                 reason.. note that this probabyl gets shipped back to the
+ #                 user as well.
+ #
+ sub read_profile {
+     my ($udom, $uname, $namespace, $what) = @_;
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+         my @queries=split(/\&/,$what);
+         if ($namespace eq 'roles') {
+             @queries = map { &unescape($_); } @queries;
+         }
+         my $qresult='';
+ 	for (my $i=0;$i<=$#queries;$i++) {
+ 	    $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
+ 	}
+ 	$qresult=~s/\&$//;              # Remove trailing & from last lookup.
+ 	if (&untie_user_hash($hashref)) {
+ 	    return $qresult;
+ 	} else {
+ 	    return "error: ".($!+0)." untie (GDBM) Failed";
+ 	}
      } else {
- 	return $passwderrors[$ErrorCode];
+ 	if ($!+0 == 2) {
+ 	    return "error:No such file or GDBM reported bad block error";
+ 	} else {
+ 	    return "error: ".($!+0)." tie (GDBM) Failed";
+ 	}
+     }
+ }
+ #--------------------- Request Handlers --------------------------------------------
+ #
+ #   By convention each request handler registers itself prior to the sub
+ #   declaration:
+ #
+ #++
+ #
+ #  Handles ping requests.
+ #  Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host we are
+ #                       known as.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub ping_handler {
+     my ($cmd, $tail, $client) = @_;
+     Debug("$cmd $tail $client .. $currenthostid:");
+     Reply( $client,\$currenthostid,"$cmd:$tail");
+     return 1;
+ }
+ &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
+ #++
+ #
+ # Handles pong requests.  Pong replies with our current host id, and
+ #                         the results of a ping sent to us via our lonc.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host we are
+ #                       connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub pong_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $reply=&Apache::lonnet::reply("ping",$clientname);
+     &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
+ #++
+ #      Called to establish an encrypted session key with the remote client.
+ #      Note that with secure lond, in most cases this function is never
+ #      invoked.  Instead, the secure session key is established either
+ #      via a local file that's locked down tight and only lives for a short
+ #      time, or via an ssl tunnel...and is generated from a bunch-o-random
+ #      bits from /dev/urandom, rather than the predictable pattern used by
+ #      by this sub.  This sub is only used in the old-style insecure
+ #      key negotiation.
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the host we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Implicit Outputs:
+ #      Reply information is sent to the client.
+ #      $cipher is set with a reference to a new IDEA encryption object.
+ #
+ sub establish_key_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $buildkey=time.$$.int(rand 100000);
+     $buildkey=~tr/1-6/A-F/;
+     $buildkey=int(rand 100000).$buildkey.int(rand 100000);
+     my $key=$currenthostid.$clientname;
+     $key=~tr/a-z/A-Z/;
+     $key=~tr/G-P/0-9/;
+     $key=~tr/Q-Z/0-9/;
+     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
+     $key=substr($key,0,32);
+     my $cipherkey=pack("H32",$key);
+     $cipher=new IDEA $cipherkey;
+     &Reply($replyfd, \$buildkey, "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("ekey", \&establish_key_handler, 0, 1,1);
+ #     Handler for the load command.  Returns the current system load average
+ #     to the requestor.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the host we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit.
+ #  Side effects:
+ #      Reply information is sent to the client.
+ sub load_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+    # Get the load average from /proc/loadavg and calculate it as a percentage of
+    # the allowed load limit as set by the perl global variable lonLoadLim
+     my $loadavg;
+     my $loadfile=IO::File->new('/proc/loadavg');
+     $loadavg=<$loadfile>;
+     $loadavg =~ s/\s.*//g;                      # Extract the first field only.
+     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
+     &Reply( $replyfd, \$loadpercent, "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("load", \&load_handler, 0, 1, 0);
+ #
+ #   Process the userload request.  This sub returns to the client the current
+ #  user load average.  It can be invoked either by clients or managers.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Implicit Inputs:
+ #      $currenthostid - Global variable that carries the name of the host
+ #                       known as.
+ #      $clientname    - Global variable that carries the name of the host we're connected to.
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit inputs:
+ #     whatever the userload() function requires.
+ #  Implicit outputs:
+ #     the reply is written to the client.
+ #
+ sub user_load_handler {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $userloadpercent=&Apache::lonnet::userload();
+     &Reply($replyfd, \$userloadpercent, "$cmd:$tail");
+     return 1;
+ }
+ &register_handler("userload", \&user_load_handler, 0, 1, 0);
+ #   Process a request for the authorization type of a user:
+ #   (userauth).
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $replyfd- File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit outputs:
+ #    The user authorization type is written to the client.
+ #
+ sub user_authorization_type {
+     my ($cmd, $tail, $replyfd) = @_;
+     my $userinput = "$cmd:$tail";
+     #  Pull the domain and username out of the command tail.
+     # and call get_auth_type to determine the authentication type.
+     my ($udom,$uname)=split(/:/,$tail);
+     my $result = &get_auth_type($udom, $uname);
+     if($result eq "nouser") {
+ 	&Failure( $replyfd, "unknown_user\n", $userinput);
+     } else {
+ 	#
+ 	# We only want to pass the second field from get_auth_type
+ 	# for ^krb.. otherwise we'll be handing out the encrypted
+ 	# password for internals e.g.
+ 	#
+ 	my ($type,$otherinfo) = split(/:/,$result);
+ 	if($type =~ /^krb/) {
+ 	    $type = $result;
+ 	} else {
+             $type .= ':';
+         }
+ 	&Reply( $replyfd, \$type, $userinput);
+     }
+     return 1;
+ }
+ &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
+ #   Process a request by a manager to push a hosts or domain table
+ #   to us.  We pick apart the command and pass it on to the subs
+ #   that already exist to do this.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ # Implicit Output:
+ #    a reply is written to the client.
+ sub push_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     &Debug("In push file handler");
+     my $userinput = "$cmd:$tail";
+     # At this time we only know that the IP of our partner is a valid manager
+     # the code below is a hook to do further authentication (e.g. to resolve
+     # spoofing).
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	&Debug("Valid manager: $client");
+ 	# Now presumably we have the bona fides of both the peer host and the
+ 	# process making the request.
+ 	my $reply = &PushFile($userinput);
+ 	&Reply($client, \$reply, $userinput);
+     } else {
+ 	&logthis("push_file_handler $client is not valid");
+ 	&Failure( $client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
+ # The du_handler routine should be considered obsolete and is retained
+ # for communication with legacy servers.  Please see the du2_handler.
+ #
+ #   du  - list the disk usage of a directory recursively.
+ #
+ #   note: stolen code from the ls file handler
+ #   under construction by Rick Banghart
+ #    .
+ # Parameters:
+ #    $cmd        - The command that dispatched us (du).
+ #    $ududir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub du_handler {
+     my ($cmd, $ududir, $client) = @_;
+     ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
+     my $userinput = "$cmd:$ududir";
+     if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
+ 	&Failure($client,"refused\n","$cmd:$ududir");
+ 	return 1;
+     }
+     #  Since $ududir could have some nasties in it,
+     #  we will require that ududir is a valid
+     #  directory.  Just in case someone tries to
+     #  slip us a  line like .;(cd /home/httpd rm -rf*)
+     #  etc.
+     #
+     if (-d $ududir) {
+ 	my $total_size=0;
+ 	my $code=sub {
+ 	    if ($_=~/\.\d+\./) { return;}
+ 	    if ($_=~/\.meta$/) { return;}
+ 	    if (-d $_)         { return;}
+ 	    $total_size+=(stat($_))[7];
+ 	};
+ 	chdir($ududir);
+ 	find($code,$ududir);
+ 	$total_size=int($total_size/1024);
+ 	&Reply($client,\$total_size,"$cmd:$ududir");
+     } else {
+ 	&Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
+     }
+     return 1;
+ }
+ &register_handler("du", \&du_handler, 0, 1, 0);
+ # Please also see the du_handler, which is obsoleted by du2.
+ # du2_handler differs from du_handler in that required path to directory
+ # provided by &propath() is prepended in the handler instead of on the
+ # client side.
+ #
+ #   du2  - list the disk usage of a directory recursively.
+ #
+ # Parameters:
+ #    $cmd        - The command that dispatched us (du).
+ #    $tail       - The tail of the request that invoked us.
+ #                  $tail is a : separated list of the following:
+ #                   - $ududir - directory path to list (before prepending)
+ #                   - $getpropath = 1 if &propath() should prepend
+ #                   - $uname - username to use for &propath or user dir
+ #                   - $udom - domain to use for &propath or user dir
+ #                   All are escaped.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to $client.
+ #
+ sub du2_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($ududir,$getpropath,$uname,$udom) = map { &unescape($_) } (split(/:/, $tail));
+     my $userinput = "$cmd:$tail";
+     if (($ududir=~/\.\./) || (($ududir!~m|^/home/httpd/|) && (!$getpropath))) {
+         &Failure($client,"refused\n","$cmd:$tail");
+         return 1;
+     }
+     if ($getpropath) {
+         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
+             $ududir = &propath($udom,$uname).'/'.$ududir;
+         } else {
+             &Failure($client,"refused\n","$cmd:$tail");
+             return 1;
+         }
+     }
+     #  Since $ududir could have some nasties in it,
+     #  we will require that ududir is a valid
+     #  directory.  Just in case someone tries to
+     #  slip us a  line like .;(cd /home/httpd rm -rf*)
+     #  etc.
+     #
+     if (-d $ududir) {
+         my $total_size=0;
+         my $code=sub {
+             if ($_=~/\.\d+\./) { return;}
+             if ($_=~/\.meta$/) { return;}
+             if (-d $_)         { return;}
+             $total_size+=(stat($_))[7];
+         };
+         chdir($ududir);
+         find($code,$ududir);
+         $total_size=int($total_size/1024);
+         &Reply($client,\$total_size,"$cmd:$ududir");
+     } else {
+         &Failure($client, "bad_directory:$ududir\n","$cmd:$tail");
+     }
+     return 1;
+ }
+ &register_handler("du2", \&du2_handler, 0, 1, 0);
+ #
+ # The ls_handler routine should be considered obsolete and is retained
+ # for communication with legacy servers.  Please see the ls3_handler.
+ #
+ #   ls  - list the contents of a directory.  For each file in the
+ #    selected directory the filename followed by the full output of
+ #    the stat function is returned.  The returned info for each
+ #    file are separated by ':'.  The stat fields are separated by &'s.
+ #
+ #    If the requested path contains /../ or is:
+ #
+ #    1. for a directory, and the path does not begin with one of:
+ #        (a) /home/httpd/html/res/<domain>
+ #        (b) /home/httpd/html/res/userfiles/
+ #        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
+ #    or is:
+ #
+ #    2. for a file, and the path (after prepending) does not begin with:
+ #    /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+ #
+ #    the response will be "refused".
+ #
+ # Parameters:
+ #    $cmd        - The command that dispatched us (ls).
+ #    $ulsdir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub ls_handler {
+     # obsoleted by ls2_handler
+     my ($cmd, $ulsdir, $client) = @_;
+     my $userinput = "$cmd:$ulsdir";
+     my $obs;
+     my $rights;
+     my $ulsout='';
+     my $ulsfn;
+     if ($ulsdir =~m{/\.\./}) {
+         &Failure($client,"refused\n",$userinput);
+         return 1;
+     }
+     if (-e $ulsdir) {
+ 	if(-d $ulsdir) {
+             unless (($ulsdir =~ m{/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                     ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/userfiles/})) {
+                 &Failure($client,"refused\n",$userinput);
+                 return 1;
+             }
+ 	    if (opendir(LSDIR,$ulsdir)) {
+ 		while ($ulsfn=readdir(LSDIR)) {
+ 		    undef($obs);
+ 		    undef($rights);
+ 		    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+ 		    #We do some obsolete checking here
+ 		    if(-e $ulsdir.'/'.$ulsfn.".meta") {
+ 			open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+ 			my @obsolete=<FILE>;
+ 			foreach my $obsolete (@obsolete) {
+ 			    if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
+ 			    if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
+ 			}
+ 		    }
+ 		    $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
+ 		    if($obs eq '1') { $ulsout.="&1"; }
+ 		    else { $ulsout.="&0"; }
+ 		    if($rights eq '1') { $ulsout.="&1:"; }
+ 		    else { $ulsout.="&0:"; }
+ 		}
+ 		closedir(LSDIR);
+ 	    }
+ 	} else {
+             unless ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/}) {
+                 &Failure($client,"refused\n",$userinput);
+                 return 1;
+             }
+ 	    my @ulsstats=stat($ulsdir);
+ 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+ 	}
+     } else {
+ 	$ulsout='no_such_dir';
+     }
+     if ($ulsout eq '') { $ulsout='empty'; }
+     &Reply($client, \$ulsout, $userinput); # This supports debug logging.
+     return 1;
+ }
+ &register_handler("ls", \&ls_handler, 0, 1, 0);
+ # The ls2_handler routine should be considered obsolete and is retained
+ # for communication with legacy servers.  Please see the ls3_handler.
+ # Please also see the ls_handler, which was itself obsoleted by ls2.
+ # ls2_handler differs from ls_handler in that it escapes its return
+ # values before concatenating them together with ':'s.
+ #
+ #   ls2  - list the contents of a directory.  For each file in the
+ #    selected directory the filename followed by the full output of
+ #    the stat function is returned.  The returned info for each
+ #    file are separated by ':'.  The stat fields are separated by &'s.
+ #
+ #    If the requested path contains /../ or is:
+ #
+ #    1. for a directory, and the path does not begin with one of:
+ #        (a) /home/httpd/html/res/<domain>
+ #        (b) /home/httpd/html/res/userfiles/
+ #        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
+ #    or is:
+ #
+ #    2. for a file, and the path (after prepending) does not begin with:
+ #    /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+ #
+ #    the response will be "refused".
+ #
+ # Parameters:
+ #    $cmd        - The command that dispatched us (ls).
+ #    $ulsdir     - The directory path to list... I'm not sure what this
+ #                  is relative as things like ls:. return e.g.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to  $client.
+ #
+ sub ls2_handler {
+     my ($cmd, $ulsdir, $client) = @_;
+     my $userinput = "$cmd:$ulsdir";
+     my $obs;
+     my $rights;
+     my $ulsout='';
+     my $ulsfn;
+     if ($ulsdir =~m{/\.\./}) {
+         &Failure($client,"refused\n",$userinput);
+         return 1;
+     }
+     if (-e $ulsdir) {
+         if(-d $ulsdir) {
+             unless (($ulsdir =~ m{/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                     ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/userfiles/})) {
+                 &Failure($client,"refused\n","$userinput");
+                 return 1;
+             }
+             if (opendir(LSDIR,$ulsdir)) {
+                 while ($ulsfn=readdir(LSDIR)) {
+                     undef($obs);
+ 		    undef($rights);
+                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+                     #We do some obsolete checking here
+                     if(-e $ulsdir.'/'.$ulsfn.".meta") {
+                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+                         my @obsolete=<FILE>;
+                         foreach my $obsolete (@obsolete) {
+                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
+                             if($obsolete =~ m|(<copyright>)(default)|) {
+                                 $rights = 1;
+                             }
+                         }
+                     }
+                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
+                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     $ulsout.= &escape($tmp).':';
+                 }
+                 closedir(LSDIR);
+             }
+         } else {
+             unless ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/}) {
+                 &Failure($client,"refused\n",$userinput);
+                 return 1;
+             }
+             my @ulsstats=stat($ulsdir);
+             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+         }
+     } else {
+         $ulsout='no_such_dir';
+    }
+    if ($ulsout eq '') { $ulsout='empty'; }
+    &Reply($client, \$ulsout, $userinput); # This supports debug logging.
+    return 1;
+ }
+ &register_handler("ls2", \&ls2_handler, 0, 1, 0);
+ #
+ #   ls3  - list the contents of a directory.  For each file in the
+ #    selected directory the filename followed by the full output of
+ #    the stat function is returned.  The returned info for each
+ #    file are separated by ':'.  The stat fields are separated by &'s.
+ #
+ #    If the requested path (after prepending) contains /../ or is:
+ #
+ #    1. for a directory, and the path does not begin with one of:
+ #        (a) /home/httpd/html/res/<domain>
+ #        (b) /home/httpd/html/res/userfiles/
+ #        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
+ #        (d) /home/httpd/html/priv/<domain>/ and client is the homeserver
+ #
+ #    or is:
+ #
+ #    2. for a file, and the path (after prepending) does not begin with:
+ #    /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+ #
+ #    the response will be "refused".
+ #
+ # Parameters:
+ #    $cmd        - The command that dispatched us (ls).
+ #    $tail       - The tail of the request that invoked us.
+ #                  $tail is a : separated list of the following:
+ #                   - $ulsdir - directory path to list (before prepending)
+ #                   - $getpropath = 1 if &propath() should prepend
+ #                   - $getuserdir = 1 if path to user dir in lonUsers should
+ #                                     prepend
+ #                   - $alternate_root - path to prepend
+ #                   - $uname - username to use for &propath or user dir
+ #                   - $udom - domain to use for &propath or user dir
+ #            All of these except $getpropath and &getuserdir are escaped.
+ #                  no_such_dir.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #     1 - indicating that the daemon should not disconnect.
+ # Side Effects:
+ #   The reply is written to $client.
+ #
+ sub ls3_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($ulsdir,$getpropath,$getuserdir,$alternate_root,$uname,$udom) =
+         split(/:/,$tail);
+     if (defined($ulsdir)) {
+         $ulsdir = &unescape($ulsdir);
+     }
+     if (defined($alternate_root)) {
+         $alternate_root = &unescape($alternate_root);
+     }
+     if (defined($uname)) {
+         $uname = &unescape($uname);
+     }
+     if (defined($udom)) {
+         $udom = &unescape($udom);
+     }
+     my $dir_root = $perlvar{'lonDocRoot'};
+     if (($getpropath) || ($getuserdir)) {
+         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
+             $dir_root = &propath($udom,$uname);
+             $dir_root =~ s/\/$//;
+         } else {
+             &Failure($client,"refused\n",$userinput);
+             return 1;
+         }
+     } elsif ($alternate_root ne '') {
+         $dir_root = $alternate_root;
+     }
+     if (($dir_root ne '') && ($dir_root ne '/')) {
+         if ($ulsdir =~ /^\//) {
+             $ulsdir = $dir_root.$ulsdir;
+         } else {
+             $ulsdir = $dir_root.'/'.$ulsdir;
+         }
+     }
+     if ($ulsdir =~m{/\.\./}) {
+         &Failure($client,"refused\n",$userinput);
+         return 1;
+     }
+     my $islocal;
+     my @machine_ids = &Apache::lonnet::current_machine_ids();
+     if (grep(/^\Q$clientname\E$/,@machine_ids)) {
+         $islocal = 1;
+     }
+     my $obs;
+     my $rights;
+     my $ulsout='';
+     my $ulsfn;
+     if (-e $ulsdir) {
+         if(-d $ulsdir) {
+             unless (($getpropath) || ($getuserdir) ||
+                     ($ulsdir =~ m{/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                     ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/userfiles/}) ||
+                     (($ulsdir =~ m{/home/httpd/html/priv/$LONCAPA::match_domain/}) && ($islocal))) {
+                 &Failure($client,"refused\n",$userinput);
+                 return 1;
+             }
+             if (opendir(LSDIR,$ulsdir)) {
+                 while ($ulsfn=readdir(LSDIR)) {
+                     undef($obs);
+                     undef($rights);
+                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
+                     #We do some obsolete checking here
+                     if(-e $ulsdir.'/'.$ulsfn.".meta") {
+                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
+                         my @obsolete=<FILE>;
+                         foreach my $obsolete (@obsolete) {
+                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
+                             if($obsolete =~ m|(<copyright>)(default)|) {
+                                 $rights = 1;
+                             }
+                         }
+                     }
+                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
+                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
+                     $ulsout.= &escape($tmp).':';
+                 }
+                 closedir(LSDIR);
+             }
+         } else {
+             unless (($getpropath) || ($getuserdir) ||
+                     ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/})) {
+                 &Failure($client,"refused\n",$userinput);
+                 return 1;
+             }
+             my @ulsstats=stat($ulsdir);
+             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
+         }
+     } else {
+         $ulsout='no_such_dir';
+     }
+     if ($ulsout eq '') { $ulsout='empty'; }
+     &Reply($client, \$ulsout, $userinput); # This supports debug logging.
+     return 1;
+ }
+ &register_handler("ls3", \&ls3_handler, 0, 1, 0);
+ sub read_lonnet_global {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $requested = &Apache::lonnet::thaw_unescape($tail);
+     my $result;
+     my %packagevars = (
+                         spareid => \%Apache::lonnet::spareid,
+                         perlvar => \%Apache::lonnet::perlvar,
+                       );
+     my %limit_to = (
+                     perlvar => {
+                                  lonOtherAuthen  => 1,
+                                  lonBalancer     => 1,
+                                  lonVersion      => 1,
+                                  lonAdmEMail     => 1,
+                                  lonSupportEMail => 1,
+                                  lonSysEMail     => 1,
+                                  lonHostID       => 1,
+                                  lonRole         => 1,
+                                  lonDefDomain    => 1,
+                                  lonLoadLim      => 1,
+                                  lonUserLoadLim  => 1,
+                                }
+                   );
+     if (ref($requested) eq 'HASH') {
+         foreach my $what (keys(%{$requested})) {
+             my $response;
+             my $items = {};
+             if (exists($packagevars{$what})) {
+                 if (ref($limit_to{$what}) eq 'HASH') {
+                     foreach my $varname (keys(%{$packagevars{$what}})) {
+                         if ($limit_to{$what}{$varname}) {
+                             $items->{$varname} = $packagevars{$what}{$varname};
+                         }
+                     }
+                 } else {
+                     $items = $packagevars{$what};
+                 }
+                 if ($what eq 'perlvar') {
+                     if (!exists($packagevars{$what}{'lonBalancer'})) {
+                         if ($dist =~ /^(centos|rhes|fedora|scientific)/) {
+                             my $othervarref=LONCAPA::Configuration::read_conf('httpd.conf');
+                             if (ref($othervarref) eq 'HASH') {
+                                 $items->{'lonBalancer'} = $othervarref->{'lonBalancer'};
+                             }
+                         }
+                     }
+                 }
+                 $response = &Apache::lonnet::freeze_escape($items);
+             }
+             $result .= &escape($what).'='.$response.'&';
+         }
+     }
+     $result =~ s/\&$//;
+     &Reply($client,\$result,$userinput);
+     return 1;
+ }
+ &register_handler("readlonnetglobal", \&read_lonnet_global, 0, 1, 0);
+ sub server_devalidatecache_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $items = &unescape($tail);
+     my @cached = split(/\&/,$items);
+     foreach my $key (@cached) {
+         if ($key =~ /:/) {
+             my ($name,$id) = map { &unescape($_); } split(/:/,$key);
+             &Apache::lonnet::devalidate_cache_new($name,$id);
+         }
+     }
+     my $result = 'ok';
+     &Reply($client,\$result,$userinput);
+     return 1;
+ }
+ &register_handler("devalidatecache", \&server_devalidatecache_handler, 0, 1, 0);
+ sub server_timezone_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $timezone;
+     my $clockfile = '/etc/sysconfig/clock'; # Fedora/CentOS/SuSE
+     my $tzfile = '/etc/timezone'; # Debian/Ubuntu
+     if (-e $clockfile) {
+         if (open(my $fh,"<$clockfile")) {
+             while (<$fh>) {
+                 next if (/^[\#\s]/);
+                 if (/^(?:TIME)?ZONE\s*=\s*['"]?\s*([\w\/]+)/) {
+                     $timezone = $1;
+                     last;
+                 }
+             }
+             close($fh);
+         }
+     } elsif (-e $tzfile) {
+         if (open(my $fh,"<$tzfile")) {
+             $timezone = <$fh>;
+             close($fh);
+             chomp($timezone);
+             if ($timezone =~ m{^Etc/(\w+)$}) {
+                 $timezone = $1;
+             }
+         }
+     }
+     &Reply($client,\$timezone,$userinput); # This supports debug logging.
+     return 1;
+ }
+ &register_handler("servertimezone", \&server_timezone_handler, 0, 1, 0);
+ sub server_loncaparev_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     &Reply($client,\$perlvar{'lonVersion'},$userinput);
+     return 1;
+ }
+ &register_handler("serverloncaparev", \&server_loncaparev_handler, 0, 1, 0);
+ sub server_homeID_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     &Reply($client,\$perlvar{'lonHostID'},$userinput);
+     return 1;
+ }
+ &register_handler("serverhomeID", \&server_homeID_handler, 0, 1, 0);
+ sub server_distarch_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $reply = &distro_and_arch();
+     &Reply($client,\$reply,$userinput);
+     return 1;
+ }
+ &register_handler("serverdistarch", \&server_distarch_handler, 0, 1, 0);
+ sub server_certs_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $result;
+     my $result = &LONCAPA::Lond::server_certs(\%perlvar);
+     &Reply($client,\$result,$userinput);
+     return;
+ }
+ &register_handler("servercerts", \&server_certs_handler, 0, 1, 0);
+ #   Process a reinit request.  Reinit requests that either
+ #   lonc or lond be reinitialized so that an updated
+ #   host.tab or domain.tab can be processed.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ #  Implicit output:
+ #     a reply is sent to the client.
+ #
+ sub reinit_process_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	chomp($userinput);
+ 	my $reply = &ReinitProcess($userinput);
+ 	&Reply( $client,  \$reply, $userinput);
+     } else {
+ 	&Failure( $client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
+ #  Process the editing script for a table edit operation.
+ #  the editing operation must be encrypted and requested by
+ #  a manager host.
+ #
+ # Parameters:
+ #      $cmd    - the actual keyword that invoked us.
+ #      $tail   - the tail of the request that invoked us.
+ #      $client - File descriptor connected to the client
+ #  Returns:
+ #      1       - Ok to continue processing.
+ #      0       - Program should exit
+ #  Implicit output:
+ #     a reply is sent to the client.
+ #
+ sub edit_table_handler {
+     my ($command, $tail, $client) = @_;
+     my $userinput = "$command:$tail";
+     my $cert = &GetCertificate($userinput);
+     if(&ValidManager($cert)) {
+ 	my($filetype, $script) = split(/:/, $tail);
+ 	if (($filetype eq "hosts") ||
+ 	    ($filetype eq "domain")) {
+ 	    if($script ne "") {
+ 		&Reply($client,              # BUGBUG - EditFile
+ 		      &EditFile($userinput), #   could fail.
+ 		      $userinput);
+ 	    } else {
+ 		&Failure($client,"refused\n",$userinput);
+ 	    }
+ 	} else {
+ 	    &Failure($client,"refused\n",$userinput);
+ 	}
+     } else {
+ 	&Failure($client,"refused\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("edit", \&edit_table_handler, 1, 0, 1);
+ #
+ #   Authenticate a user against the LonCAPA authentication
+ #   database.  Note that there are several authentication
+ #   possibilities:
+ #   - unix     - The user can be authenticated against the unix
+ #                password file.
+ #   - internal - The user can be authenticated against a purely
+ #                internal per user password file.
+ #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
+ #                ticket granting authority.
+ #   - user     - The person tailoring LonCAPA can supply a user authentication
+ #                mechanism that is per system.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub authenticate_handler {
+     my ($cmd, $tail, $client) = @_;
+     #  Regenerate the full input line
+     my $userinput  = $cmd.":".$tail;
+     #  udom    - User's domain.
+     #  uname   - Username.
+     #  upass   - User's password.
+     #  checkdefauth - Pass to validate_user() to try authentication
+     #                 with default auth type(s) if no user account.
+     #  clientcancheckhost - Passed by clients with functionality in lonauth.pm
+     #                       to check if session can be hosted.
+     my ($udom, $uname, $upass, $checkdefauth, $clientcancheckhost)=split(/:/,$tail);
+     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass,  checkdefauth = $checkdefauth");
+     chomp($upass);
+     $upass=&unescape($upass);
+     my $pwdcorrect = &validate_user($udom,$uname,$upass,$checkdefauth);
+     if($pwdcorrect) {
+         my $canhost = 1;
+         unless ($clientcancheckhost) {
+             my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+             my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+             my @intdoms;
+             my $internet_names = &Apache::lonnet::get_internet_names($clientname);
+             if (ref($internet_names) eq 'ARRAY') {
+                 @intdoms = @{$internet_names};
+             }
+             unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
+                 my ($remote,$hosted);
+                 my $remotesession = &get_usersession_config($udom,'remotesession');
+                 if (ref($remotesession) eq 'HASH') {
+                     $remote = $remotesession->{'remote'};
+                 }
+                 my $hostedsession = &get_usersession_config($clienthomedom,'hostedsession');
+                 if (ref($hostedsession) eq 'HASH') {
+                     $hosted = $hostedsession->{'hosted'};
+                 }
+                 $canhost = &Apache::lonnet::can_host_session($udom,$clientname,
+                                                              $clientversion,
+                                                              $remote,$hosted);
+             }
+         }
+         if ($canhost) {
+             &Reply( $client, "authorized\n", $userinput);
+         } else {
+             &Reply( $client, "not_allowed_to_host\n", $userinput);
+         }
+ 	#
+ 	#  Bad credentials: Failed to authorize
+ 	#
+     } else {
+ 	&Failure( $client, "non_authorized\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("auth", \&authenticate_handler, 1, 1, 0);
+ #
+ #   Change a user's password.  Note that this function is complicated by
+ #   the fact that a user may be authenticated in more than one way:
+ #   At present, we are not able to change the password for all types of
+ #   authentication methods.  Only for:
+ #      unix    - unix password or shadow passoword style authentication.
+ #      local   - Locally written authentication mechanism.
+ #   For now, kerb4 and kerb5 password changes are not supported and result
+ #   in an error.
+ # FUTURE WORK:
+ #    Support kerberos passwd changes?
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ sub change_password_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
+     #
+     #  udom  - user's domain.
+     #  uname - Username.
+     #  upass - Current password.
+     #  npass - New password.
+     #  context - Context in which this was called
+     #            (preferences or reset_by_email).
+     #  lonhost - HostID of server where request originated
+     my ($udom,$uname,$upass,$npass,$context,$lonhost)=split(/:/,$tail);
+     $upass=&unescape($upass);
+     $npass=&unescape($npass);
+     &Debug("Trying to change password for $uname");
+     # First require that the user can be authenticated with their
+     # old password unless context was 'reset_by_email':
+     my ($validated,$failure);
+     if ($context eq 'reset_by_email') {
+         if ($lonhost eq '') {
+             $failure = 'invalid_client';
+         } else {
+             $validated = 1;
+         }
+     } else {
+         $validated = &validate_user($udom, $uname, $upass);
+     }
+     if($validated) {
+ 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
+ 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
+ 	if ($howpwd eq 'internal') {
+ 	    &Debug("internal auth");
+             my $ncpass = &hash_passwd($udom,$npass);
+ 	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
+ 		my $msg="Result of password change for $uname: pwchange_success";
+                 if ($lonhost) {
+                     $msg .= " - request originated from: $lonhost";
+                 }
+                 &logthis($msg);
+                 &update_passwd_history($uname,$udom,$howpwd,$context);
+ 		&Reply($client, "ok\n", $userinput);
+ 	    } else {
+ 		&logthis("Unable to open $uname passwd "
+ 			 ."to change password");
+ 		&Failure( $client, "non_authorized\n",$userinput);
+ 	    }
+ 	} elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
+ 	    my $result = &change_unix_password($uname, $npass);
+             if ($result eq 'ok') {
+                 &update_passwd_history($uname,$udom,$howpwd,$context);
+              }
+ 	    &logthis("Result of password change for $uname: ".
+ 		     $result);
+ 	    &Reply($client, \$result, $userinput);
+ 	} else {
+ 	    # this just means that the current password mode is not
+ 	    # one we know how to change (e.g the kerberos auth modes or
+ 	    # locally written auth handler).
+ 	    #
+ 	    &Failure( $client, "auth_mode_error\n", $userinput);
+ 	}
+     } else {
+ 	if ($failure eq '') {
+ 	    $failure = 'non_authorized';
+ 	}
+ 	&Failure( $client, "$failure\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("passwd", \&change_password_handler, 1, 1, 0);
+ sub hash_passwd {
+     my ($domain,$plainpass,@rest) = @_;
+     my ($salt,$cost);
+     if (@rest) {
+         $cost = $rest[0];
+         # salt is first 22 characters, base-64 encoded by bcrypt
+         my $plainsalt = substr($rest[1],0,22);
+         $salt = Crypt::Eksblowfish::Bcrypt::de_base64($plainsalt);
+     } else {
+         my $defaultcost;
+         my %domconfig =
+             &Apache::lonnet::get_dom('configuration',['password'],$domain);
+         if (ref($domconfig{'password'}) eq 'HASH') {
+             $defaultcost = $domconfig{'password'}{'cost'};
+         }
+         if (($defaultcost eq '') || ($defaultcost =~ /D/)) {
+             $cost = 10;
+         } else {
+             $cost = $defaultcost;
+         }
+         # Generate random 16-octet base64 salt
+         $salt = "";
+         $salt .= pack("C", int rand(256)) for 1..16;
+     }
+     my $hash = &Crypt::Eksblowfish::Bcrypt::bcrypt_hash({
+         key_nul => 1,
+         cost    => $cost,
+         salt    => $salt,
+     }, Digest::SHA::sha512(Encode::encode('UTF-8',$plainpass)));
+     my $result = join("!", "", "bcrypt", sprintf("%02d",$cost),
+                 &Crypt::Eksblowfish::Bcrypt::en_base64($salt).
+                 &Crypt::Eksblowfish::Bcrypt::en_base64($hash));
+     return $result;
+ }
+ #
+ #   Create a new user.  User in this case means a lon-capa user.
+ #   The user must either already exist in some authentication realm
+ #   like kerberos or the /etc/passwd.  If not, a user completely local to
+ #   this loncapa system is created.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ sub add_user_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
+     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
+     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
+     if($udom eq $currentdomainid) { # Reject new users for other domains...
+ 	my $oldumask=umask(0077);
+ 	chomp($npass);
+ 	$npass=&unescape($npass);
+ 	my $passfilename  = &password_path($udom, $uname);
+ 	&Debug("Password file created will be:".$passfilename);
+ 	if (-e $passfilename) {
+ 	    &Failure( $client, "already_exists\n", $userinput);
+ 	} else {
+ 	    my $fperror='';
+ 	    if (!&mkpath($passfilename)) {
+ 		$fperror="error: ".($!+0)." mkdir failed while attempting "
+ 		    ."makeuser";
+ 	    }
+ 	    unless ($fperror) {
+ 		my $result=&make_passwd_file($uname,$udom,$umode,$npass,
+                                              $passfilename,'makeuser');
+ 		&Reply($client,\$result, $userinput);     #BUGBUG - could be fail
+ 	    } else {
+ 		&Failure($client, \$fperror, $userinput);
+ 	    }
+ 	}
+ 	umask($oldumask);
+     }  else {
+ 	&Failure($client, "not_right_domain\n",
+ 		$userinput);	# Even if we are multihomed.
+     }
+     return 1;
+ }
+ &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
+ #
+ #   Change the authentication method of a user.  Note that this may
+ #   also implicitly change the user's password if, for example, the user is
+ #   joining an existing authentication realm.  Known authentication realms at
+ #   this time are:
+ #    internal   - Purely internal password file (only loncapa knows this user)
+ #    local      - Institutionally written authentication module.
+ #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
+ #    kerb4      - kerberos version 4
+ #    kerb5      - kerberos version 5
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ # NOTE:
+ #   This is also used to change the authentication credential values (e.g. passwd).
+ #
+ #
+ sub change_authentication_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = "$cmd:$tail";              # Reconstruct user input.
+     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
+     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
+     if ($udom ne $currentdomainid) {
+ 	&Failure( $client, "not_right_domain\n", $client);
+     } else {
+ 	chomp($npass);
+ 	$npass=&unescape($npass);
+ 	my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
+ 	my $passfilename = &password_path($udom, $uname);
+ 	if ($passfilename) {	# Not allowed to create a new user!!
+ 	    # If just changing the unix passwd. need to arrange to run
+ 	    # passwd since otherwise make_passwd_file will fail as
+ 	    # creation of unix authenticated users is no longer supported
+             # except from the command line, when running make_domain_coordinator.pl
+ 	    if(($oldauth =~/^unix/) && ($umode eq "unix")) {
+ 		my $result = &change_unix_password($uname, $npass);
+ 		&logthis("Result of password change for $uname: ".$result);
+ 		if ($result eq "ok") {
+                     &update_passwd_history($uname,$udom,$umode,'changeuserauth');
+ 		    &Reply($client, \$result);
+ 		} else {
+ 		    &Failure($client, \$result);
+ 		}
+ 	    } else {
+ 		my $result=&make_passwd_file($uname,$udom,$umode,$npass,
+                                              $passfilename,'changeuserauth');
+ 		#
+ 		#  If the current auth mode is internal, and the old auth mode was
+ 		#  unix, or krb*,  and the user is an author for this domain,
+ 		#  re-run manage_permissions for that role in order to be able
+ 		#  to take ownership of the construction space back to www:www
+ 		#
+ 		&Reply($client, \$result, $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
+ sub update_passwd_history {
+     my ($uname,$udom,$umode,$context) = @_;
+     my $proname=&propath($udom,$uname);
+     my $now = time;
+     if (open(my $fh,">>$proname/passwd.log")) {
+         print $fh "$now:$umode:$context\n";
+         close($fh);
+     }
+     return;
+ }
+ #
+ #   Determines if this is the home server for a user.  The home server
+ #   for a user will have his/her lon-capa passwd file.  Therefore all we need
+ #   to do is determine if this file exists.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub is_home_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = "$cmd:$tail";
+     my ($udom,$uname)=split(/:/,$tail);
+     chomp($uname);
+     my $passfile = &password_filename($udom, $uname);
+     if($passfile) {
+ 	&Reply( $client, "found\n", $userinput);
+     } else {
+ 	&Failure($client, "not_found\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("home", \&is_home_handler, 0,1,0);
+ #
+ #   Process an update request for a resource.
+ #   A resource has been modified that we hold a subscription to.
+ #   If the resource is not local, then we must update, or at least invalidate our
+ #   cached copy of the resource.
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ # Implicit inputs:
+ #    The authentication systems describe above have their own forms of implicit
+ #    input into the authentication process that are described above.
+ #
+ sub update_resource_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $fname= $tail;		# This allows interactive testing
+     my $ownership=ishome($fname);
+     if ($ownership eq 'not_owner') {
+ 	if (-e $fname) {
+             # Delete preview file, if exists
+             unlink("$fname.tmp");
+             # Get usage stats
+ 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
+ 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
+ 	    my $now=time;
+ 	    my $since=$now-$atime;
+             # If the file has not been used within lonExpire seconds,
+             # unsubscribe from it and delete local copy
+ 	    if ($since>$perlvar{'lonExpire'}) {
+ 		my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
+ 		&devalidate_meta_cache($fname);
+ 		unlink("$fname");
+ 		unlink("$fname.meta");
+ 	    } else {
+             # Yes, this is in active use. Get a fresh copy. Since it might be in
+             # very active use and huge (like a movie), copy it to "in.transfer" filename first.
+ 		my $transname="$fname.in.transfer";
+ 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
+ 		my $response;
+ # FIXME: cannot replicate files that take more than two minutes to transfer?
+ #		alarm(120);
+ # FIXME: this should use the LWP mechanism, not internal alarms.
+                 alarm(1200);
+ 		{
+ 		    my $request=new HTTP::Request('GET',"$remoteurl");
+                     $response=&LONCAPA::LWPReq::makerequest($clientname,$request,$transname,\%perlvar,1200,0,1);
+ 		}
+ 		alarm(0);
+ 		if ($response->is_error()) {
+ # FIXME: we should probably clean up here instead of just whine
+ 		    unlink($transname);
+ 		    my $message=$response->status_line;
+ 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
+ 		} else {
+ 		    if ($remoteurl!~/\.meta$/) {
+ # FIXME: isn't there an internal LWP mechanism for this?
+ 			alarm(120);
+ 			{
+ 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
+                             my $mresponse = &LONCAPA::LWPReq::makerequest($clientname,$mrequest,$fname.'.meta',\%perlvar,120,0,1);
+ 			    if ($mresponse->is_error()) {
+ 				unlink($fname.'.meta');
+ 			    }
+ 			}
+ 			alarm(0);
+ 		    }
+                     # we successfully transfered, copy file over to real name
+ 		    rename($transname,$fname);
+ 		    &devalidate_meta_cache($fname);
+ 		}
+ 	    }
+ 	    &Reply( $client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "not_found\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "rejected\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("update", \&update_resource_handler, 0 ,1, 0);
+ sub devalidate_meta_cache {
+     my ($url) = @_;
+     use Cache::Memcached;
+     my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
+     $url = &Apache::lonnet::declutter($url);
+     $url =~ s-\.meta$--;
+     my $id = &escape('meta:'.$url);
+     $memcache->delete($id);
+ }
+ #
+ #   Fetch a user file from a remote server to the user's home directory
+ #   userfiles subdir.
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub fetch_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $fname           = $tail;
+     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     my $udir=&propath($udom,$uname).'/userfiles';
+     unless (-e $udir) {
+ 	mkdir($udir,0770);
+     }
+     Debug("fetch user file for $fname");
+     if (-e $udir) {
+ 	$ufile=~s/^[\.\~]+//;
+ 	# IF necessary, create the path right down to the file.
+ 	# Note that any regular files in the way of this path are
+ 	# wiped out to deal with some earlier folly of mine.
+ 	if (!&mkpath($udir.'/'.$ufile)) {
+ 	    &Failure($client, "unable_to_create\n", $userinput);
+ 	}
+ 	my $destname=$udir.'/'.$ufile;
+ 	my $transname=$udir.'/'.$ufile.'.in.transit';
+         my $clientprotocol=$Apache::lonnet::protocol{$clientname};
+         $clientprotocol = 'http' if ($clientprotocol ne 'https');
+ 	my $clienthost = &Apache::lonnet::hostname($clientname);
+ 	my $remoteurl=$clientprotocol.'://'.$clienthost.'/userfiles/'.$fname;
+ 	my $response;
+ 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
+ 	alarm(1200);
+ 	{
+ 	    my $request=new HTTP::Request('GET',"$remoteurl");
+             my $verifycert = 1;
+             my @machine_ids = &Apache::lonnet::current_machine_ids();
+             if (grep(/^\Q$clientname\E$/,@machine_ids)) {
+                 $verifycert = 0;
+             }
+             $response = &LONCAPA::LWPReq::makerequest($clientname,$request,$transname,\%perlvar,1200,$verifycert);
+ 	}
+ 	alarm(0);
+ 	if ($response->is_error()) {
+ 	    unlink($transname);
+ 	    my $message=$response->status_line;
+ 	    &logthis("LWP GET: $message for $fname ($remoteurl)");
+ 	    &Failure($client, "failed\n", $userinput);
+ 	} else {
+ 	    Debug("Renaming $transname to $destname");
+ 	    if (!rename($transname,$destname)) {
+ 		&logthis("Unable to move $transname to $destname");
+ 		unlink($transname);
+ 		&Failure($client, "failed\n", $userinput);
+ 	    } else {
+                 if ($fname =~ /^default.+\.(page|sequence)$/) {
+                     my ($major,$minor) = split(/\./,$clientversion);
+                     if (($major < 2) || ($major == 2 && $minor < 11)) {
+                         my $now = time;
+                         &Apache::lonnet::do_cache_new('crschange',$udom.'_'.$uname,$now,600);
+                         my $key = &escape('internal.contentchange');
+                         my $what = "$key=$now";
+                         my $hashref = &tie_user_hash($udom,$uname,'environment',
+                                                      &GDBM_WRCREAT(),"P",$what);
+                         if ($hashref) {
+                             $hashref->{$key}=$now;
+                             if (!&untie_user_hash($hashref)) {
+                                 &logthis("error: ".($!+0)." untie (GDBM) failed ".
+                                          "when updating internal.contentchange");
+                             }
+                         }
+                     }
+                 }
+ 		&Reply($client, "ok\n", $userinput);
+ 	    }
+ 	}
+     } else {
+ 	&Failure($client, "not_home\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
+ #
+ #   Remove a file from a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
+ #
+ # Returns:
+ #    1    - Continue processing.
+ sub remove_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
+     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     if ($ufile =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse
+ 	# to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $file=$udir.'/userfiles/'.$ufile;
+ 	    if (-e $file) {
+ 		#
+ 		#   If the file is a regular file unlink is fine...
+ 		#   However it's possible the client wants a dir
+ 		#   removed, in which case rmdir is more appropriate.
+ 		#   Note: rmdir will only remove an empty directory.
+ 		#
+ 	        if (-f $file){
+ 		    unlink($file);
+                     # for html files remove the associated .bak file
+                     # which may have been created by the editor.
+                     if ($ufile =~ m{^((docs|supplemental)/(?:\d+|default)/\d+(?:|/.+)/)[^/]+\.x?html?$}i) {
+                         my $path = $1;
+                         if (-e $file.'.bak') {
+                             unlink($file.'.bak');
+                         }
+                     }
+ 		} elsif(-d $file) {
+ 		    rmdir($file);
+ 		}
+ 		if (-e $file) {
+ 		    #  File is still there after we deleted it ?!?
+ 		    &Failure($client, "failed\n", "$cmd:$tail");
+ 		} else {
+ 		    &Reply($client, "ok\n", "$cmd:$tail");
+ 		}
+ 	    } else {
+ 		&Failure($client, "not_found\n", "$cmd:$tail");
+ 	    }
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
+ #
+ #   make a directory in a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
+ #
+ # Returns:
+ #    1    - Continue processing.
+ sub mkdir_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
+     $dir=&unescape($dir);
+     my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
+     if ($ufile =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse
+ 	# to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $newdir=$udir.'/userfiles/'.$ufile.'/';
+ 	    if (!&mkpath($newdir)) {
+ 		&Failure($client, "failed\n", "$cmd:$tail");
+ 	    }
+ 	    &Reply($client, "ok\n", "$cmd:$tail");
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
      }
+     return 1;
  }
+ &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
  #
- # Convert an error return code from lcuseradd to a string value:
+ #   rename a file in a user's home directory userfiles subdirectory.
+ # Parameters:
+ #    cmd   - the Lond request keyword that got us here.
+ #    tail  - the part of the command past the keyword.
+ #    client- File descriptor connected with the client.
  #
- sub lcuseraddstrerror {
+ # Returns:
+ #    1    - Continue processing.
+ sub rename_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($udom,$uname,$old,$new) = split(/:/, $tail);
+     $old=&unescape($old);
+     $new=&unescape($new);
+     if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
+ 	# any files paths with /../ in them refuse to deal with
+ 	&Failure($client, "refused\n", "$cmd:$tail");
+     } else {
+ 	my $udir = &propath($udom,$uname);
+ 	if (-e $udir) {
+ 	    my $oldfile=$udir.'/userfiles/'.$old;
+ 	    my $newfile=$udir.'/userfiles/'.$new;
+ 	    if (-e $newfile) {
+ 		&Failure($client, "exists\n", "$cmd:$tail");
+ 	    } elsif (! -e $oldfile) {
+ 		&Failure($client, "not_found\n", "$cmd:$tail");
+ 	    } else {
+ 		if (!rename($oldfile,$newfile)) {
+ 		    &Failure($client, "failed\n", "$cmd:$tail");
+ 		} else {
+ 		    &Reply($client, "ok\n", "$cmd:$tail");
+ 		}
+ 	    }
+ 	} else {
+ 	    &Failure($client, "not_home\n", "$cmd:$tail");
+ 	}
+     }
+     return 1;
+ }
+ &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
+ #
+ #  Checks if the specified user has an active session on the server
+ #  return ok if so, not_found if not
+ #
+ # Parameters:
+ #   cmd      - The request keyword that dispatched to tus.
+ #   tail     - The tail of the request (colon separated parameters).
+ #   client   - Filehandle open on the client.
+ # Return:
+ #    1.
+ sub user_has_session_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($udom, $uname) = map { &unescape($_) } (split(/:/, $tail));
+     opendir(DIR,$perlvar{'lonIDsDir'});
+     my $filename;
+     while ($filename=readdir(DIR)) {
+ 	last if ($filename=~/^\Q$uname\E_\d+_\Q$udom\E_/);
+     }
+     if ($filename) {
+ 	&Reply($client, "ok\n", "$cmd:$tail");
+     } else {
+ 	&Failure($client, "not_found\n", "$cmd:$tail");
+     }
+     return 1;
+ }
+ &register_handler("userhassession", \&user_has_session_handler, 0,1,0);
+ #
+ #  Authenticate access to a user file by checking that the token the user's
+ #  passed also exists in their session file
+ #
+ # Parameters:
+ #   cmd      - The request keyword that dispatched to tus.
+ #   tail     - The tail of the request (colon separated parameters).
+ #   client   - Filehandle open on the client.
+ # Return:
+ #    1.
+ sub token_auth_user_file_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($fname, $session) = split(/:/, $tail);
+     chomp($session);
+     my $reply="non_auth";
+     my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
+     if (open(ENVIN,"$file")) {
+ 	flock(ENVIN,LOCK_SH);
+ 	tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640);
+ 	if (exists($disk_env{"userfile.$fname"})) {
+ 	    $reply="ok";
+ 	} else {
+ 	    foreach my $envname (keys(%disk_env)) {
+ 		if ($envname=~ m|^userfile\.\Q$fname\E|) {
+ 		    $reply="ok";
+ 		    last;
+ 		}
+ 	    }
+ 	}
+ 	untie(%disk_env);
+ 	close(ENVIN);
+ 	&Reply($client, \$reply, "$cmd:$tail");
+     } else {
+ 	&Failure($client, "invalid_token\n", "$cmd:$tail");
+     }
+     return 1;
+ }
+ &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
+ #
+ #   Unsubscribe from a resource.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub unsubscribe_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($fname) = split(/:/,$tail); # Split in case there's extrs.
+     &Debug("Unsubscribing $fname");
+     if (-e $fname) {
+ 	&Debug("Exists");
+ 	&Reply($client, &unsub($fname,$clientip), $userinput);
+     } else {
+ 	&Failure($client, "not_found\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
+ #   Subscribe to a resource
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub subscribe_handler {
+     my ($cmd, $tail, $client)= @_;
+     my $userinput  = "$cmd:$tail";
+     &Reply( $client, &subscribe($userinput,$clientip), $userinput);
+     return 1;
+ }
+ &register_handler("sub", \&subscribe_handler, 0, 1, 0);
+ #
+ #   Determine the latest version of a resource (it looks for the highest
+ #   past version and then returns that +1)
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #                 (Should consist of an absolute path to a file)
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub current_version_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my $fname   = $tail;
+     &Reply( $client, &currentversion($fname)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
+ #  Make an entry in a user's activity log.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub activity_log_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($udom,$uname,$what)=split(/:/,$tail);
+     chomp($what);
+     my $proname=&propath($udom,$uname);
+     my $now=time;
+     my $hfh;
+     if ($hfh=IO::File->new(">>$proname/activity.log")) {
+ 	print $hfh "$now:$clientname:$what\n";
+ 	&Reply( $client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)." IO::File->new Failed "
+ 		 ."while attempting log\n",
+ 		 $userinput);
+     }
+     return 1;
+ }
+ &register_handler("log", \&activity_log_handler, 0, 1, 0);
+ #
+ #   Put a namespace entry in a user profile hash.
+ #   My druthers would be for this to be an encrypted interaction too.
+ #   anything that might be an inadvertent covert channel about either
+ #   user authentication or user personal information....
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub put_user_profile_entry {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
+     if ($namespace ne 'roles') {
+ 	chomp($what);
+ 	my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				  &GDBM_WRCREAT(),"P",$what);
+ 	if($hashref) {
+ 	    my @pairs=split(/\&/,$what);
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+ 		$hashref->{$key}=$value;
+ 	    }
+ 	    if (&untie_user_hash($hashref)) {
+ 		&Reply( $client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ 			"while attempting put\n",
+ 			$userinput);
+ 	    }
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting put\n", $userinput);
+ 	}
+     } else {
+         &Failure( $client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
+ #   Put a piece of new data in hash, returns error if entry already exists
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub newput_user_profile_entry {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
+     if ($namespace eq 'roles') {
+         &Failure( $client, "refused\n", $userinput);
+ 	return 1;
+     }
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(),"N",$what);
+     if(!$hashref) {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		  "while attempting put\n", $userinput);
+ 	return 1;
+     }
+     my @pairs=split(/\&/,$what);
+     foreach my $pair (@pairs) {
+ 	my ($key,$value)=split(/=/,$pair);
+ 	if (exists($hashref->{$key})) {
+             if (!&untie_user_hash($hashref)) {
+                 &logthis("error: ".($!+0)." untie (GDBM) failed ".
+                          "while attempting newput - early out as key exists");
+             }
+             &Failure($client, "key_exists: ".$key."\n",$userinput);
+             return 1;
+ 	}
+     }
+     foreach my $pair (@pairs) {
+ 	my ($key,$value)=split(/=/,$pair);
+ 	$hashref->{$key}=$value;
+     }
+     if (&untie_user_hash($hashref)) {
+ 	&Reply( $client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ 		 "while attempting put\n",
+ 		 $userinput);
+     }
+     return 1;
+ }
+ &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
+ #
+ #   Increment a profile entry in the user history file.
+ #   The history contains keyword value pairs.  In this case,
+ #   The value itself is a pair of numbers.  The first, the current value
+ #   the second an increment that this function applies to the current
+ #   value.
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #
+ sub increment_user_value_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput   = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
+     if ($namespace ne 'roles') {
+         chomp($what);
+ 	my $hashref = &tie_user_hash($udom, $uname,
+ 				     $namespace, &GDBM_WRCREAT(),
+ 				     "P",$what);
+ 	if ($hashref) {
+ 	    my @pairs=split(/\&/,$what);
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+                 $value = &unescape($value);
+ 		# We could check that we have a number...
+ 		if (! defined($value) || $value eq '') {
+ 		    $value = 1;
+ 		}
+ 		$hashref->{$key}+=$value;
+                 if ($namespace eq 'nohist_resourcetracker') {
+                     if ($hashref->{$key} < 0) {
+                         $hashref->{$key} = 0;
+                     }
+                 }
+ 	    }
+ 	    if (&untie_user_hash($hashref)) {
+ 		&Reply( $client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+ 			 "while attempting inc\n", $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting inc\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
+ #
+ #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
+ #   Each 'role' a user has implies a set of permissions.  Adding a new role
+ #   for a person grants the permissions packaged with that role
+ #   to that user when the role is selected.
+ #
+ # Parameters:
+ #    $cmd       - The command string (rolesput).
+ #    $tail      - The remainder of the request line.  For rolesput this
+ #                 consists of a colon separated list that contains:
+ #                 The domain and user that is granting the role (logged).
+ #                 The domain and user that is getting the role.
+ #                 The roles being granted as a set of & separated pairs.
+ #                 each pair a key value pair.
+ #    $client    - File descriptor connected to the client.
+ # Returns:
+ #     0         - If the daemon should exit
+ #     1         - To continue processing.
+ #
+ #
+ sub roles_put_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = "$cmd:$tail";
+     my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
+     my $namespace='roles';
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(), "P",
+ 				 "$exedom:$exeuser:$what");
+     #
+     #  Log the attempt to set a role.  The {}'s here ensure that the file
+     #  handle is open for the minimal amount of time.  Since the flush
+     #  is done on close this improves the chances the log will be an un-
+     #  corrupted ordered thing.
+     if ($hashref) {
+ 	my $pass_entry = &get_auth_type($udom, $uname);
+ 	my ($auth_type,$pwd)  = split(/:/, $pass_entry);
+ 	$auth_type = $auth_type.":";
+ 	my @pairs=split(/\&/,$what);
+ 	foreach my $pair (@pairs) {
+ 	    my ($key,$value)=split(/=/,$pair);
+ 	    &manage_permissions($key, $udom, $uname,
+ 			       $auth_type);
+ 	    $hashref->{$key}=$value;
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting rolesput\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting rolesput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
+ #
+ #   Deletes (removes) a role for a user.   This is equivalent to removing
+ #  a permissions package associated with the role from the user's profile.
+ #
+ # Parameters:
+ #     $cmd                 - The command (rolesdel)
+ #     $tail                - The remainder of the request line. This consists
+ #                             of:
+ #                             The domain and user requesting the change (logged)
+ #                             The domain and user being changed.
+ #                             The roles being revoked.  These are shipped to us
+ #                             as a bunch of & separated role name keywords.
+ #     $client              - The file handle open on the client.
+ # Returns:
+ #     1                    - Continue processing
+ #     0                    - Exit.
+ #
+ sub roles_delete_handler {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput    = "$cmd:$tail";
+     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
+     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
+ 	   "what = ".$what);
+     my $namespace='roles';
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(), "D",
+ 				 "$exedom:$exeuser:$what");
+     if ($hashref) {
+ 	my @rolekeys=split(/\&/,$what);
+ 	foreach my $key (@rolekeys) {
+ 	    delete $hashref->{$key};
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting rolesdel\n", $userinput);
+ 	}
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting rolesdel\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
+ # Unencrypted get from a user's profile database.  See
+ # GetProfileEntryEncrypted for a version that does end-to-end encryption.
+ # This function retrieves a keyed item from a specific named database in the
+ # user's directory.
+ #
+ # Parameters:
+ #   $cmd             - Command request keyword (get).
+ #   $tail            - Tail of the command.  This is a colon separated list
+ #                      consisting of the domain and username that uniquely
+ #                      identifies the profile,
+ #                      The 'namespace' which selects the gdbm file to
+ #                      do the lookup in,
+ #                      & separated list of keys to lookup.  Note that
+ #                      the values are returned as an & separated list too.
+ #   $client          - File descriptor open on the client.
+ # Returns:
+ #   1       - Continue processing.
+ #   0       - Exit.
+ #
+ sub get_profile_entry {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput= "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+     chomp($what);
+     my $replystring = read_profile($udom, $uname, $namespace, $what);
+     my ($first) = split(/:/,$replystring);
+     if($first ne "error") {
+ 	&Reply($client, \$replystring, $userinput);
+     } else {
+ 	&Failure($client, $replystring." while attempting get\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("get", \&get_profile_entry, 0,1,0);
+ #
+ #  Process the encrypted get request.  Note that the request is sent
+ #  in clear, but the reply is encrypted.  This is a small covert channel:
+ #  information about the sensitive keys is given to the snooper.  Just not
+ #  information about the values of the sensitive key.  Hmm if I wanted to
+ #  know these I'd snoop for the egets. Get the profile item names from them
+ #  and then issue a get for them since there's no enforcement of the
+ #  requirement of an encrypted get for particular profile items.  If I
+ #  were re-doing this, I'd force the request to be encrypted as well as the
+ #  reply.  I'd also just enforce encrypted transactions for all gets since
+ #  that would prevent any covert channel snooping.
+ #
+ #  Parameters:
+ #     $cmd               - Command keyword of request (eget).
+ #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
+ #     $client            - File open on the client.
+ #  Returns:
+ #     1      - Continue processing
+ #     0      - server should exit.
+ sub get_profile_entry_encrypted {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+     chomp($what);
+     my $qresult = read_profile($udom, $uname, $namespace, $what);
+     my ($first) = split(/:/, $qresult);
+     if($first ne "error") {
+ 	if ($cipher) {
+ 	    my $cmdlength=length($qresult);
+ 	    $qresult.="         ";
+ 	    my $encqresult='';
+ 	    for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+ 		$encqresult.= unpack("H16",
+ 				     $cipher->encrypt(substr($qresult,
+ 							     $encidx,
+)));
+ 	    }
+ 	    &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
+ 	} else {
+ 		&Failure( $client, "error:no_key\n", $userinput);
+ 	    }
+     } else {
+ 	&Failure($client, "$qresult while attempting eget\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
+ #
+ #   Deletes a key in a user profile database.
+ #
+ #   Parameters:
+ #       $cmd                  - Command keyword (del).
+ #       $tail                 - Command tail.  IN this case a colon
+ #                               separated list containing:
+ #                               The domain and user that identifies uniquely
+ #                               the identity of the user.
+ #                               The profile namespace (name of the profile
+ #                               database file).
+ #                               & separated list of keywords to delete.
+ #       $client              - File open on client socket.
+ # Returns:
+ #     1   - Continue processing
+ #     0   - Exit server.
+ #
+ #
+ sub delete_profile_entry {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "cmd:$tail";
+     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
+     chomp($what);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_WRCREAT(),
+ 				 "D",$what);
+     if ($hashref) {
+         my @keys=split(/\&/,$what);
+ 	foreach my $key (@keys) {
+ 	    delete($hashref->{$key});
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting del\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting del\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("del", \&delete_profile_entry, 0, 1, 0);
+ #
+ #  List the set of keys that are defined in a profile database file.
+ #  A successful reply from this will contain an & separated list of
+ #  the keys.
+ # Parameters:
+ #     $cmd              - Command request (keys).
+ #     $tail             - Remainder of the request, a colon separated
+ #                         list containing domain/user that identifies the
+ #                         user being queried, and the database namespace
+ #                         (database filename essentially).
+ #     $client           - File open on the client.
+ #  Returns:
+ #    1    - Continue processing.
+ #    0    - Exit the server.
+ #
+ sub get_profile_keys {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace)=split(/:/,$tail);
+     my $qresult='';
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				  &GDBM_READER());
+     if ($hashref) {
+ 	foreach my $key (keys %$hashref) {
+ 	    $qresult.="$key&";
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply($client, \$qresult, $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting keys\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting keys\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("keys", \&get_profile_keys, 0, 1, 0);
+ #
+ #   Dump the contents of a user profile database.
+ #   Note that this constitutes a very large covert channel too since
+ #   the dump will return sensitive information that is not encrypted.
+ #   The naive security assumption is that the session negotiation ensures
+ #   our client is trusted and I don't believe that's assured at present.
+ #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
+ #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
+ #
+ #  Parameters:
+ #     $cmd           - The command request keyword (currentdump).
+ #     $tail          - Remainder of the request, consisting of a colon
+ #                      separated list that has the domain/username and
+ #                      the namespace to dump (database file).
+ #     $client        - file open on the remote client.
+ # Returns:
+ #     1    - Continue processing.
+ #     0    - Exit the server.
+ #
+ sub dump_profile_database {
+     my ($cmd, $tail, $client) = @_;
+     my $res = LONCAPA::Lond::dump_profile_database($tail);
+     if ($res =~ /^error:/) {
+         Failure($client, \$res, "$cmd:$tail");
+     } else {
+         Reply($client, \$res, "$cmd:$tail");
+     }
+     return 1;
+     #TODO remove
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace) = split(/:/,$tail);
+     my $hashref = &tie_user_hash($udom, $uname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+ 	# Structure of %data:
+ 	# $data{$symb}->{$parameter}=$value;
+ 	# $data{$symb}->{'v.'.$parameter}=$version;
+ 	# since $parameter will be unescaped, we do not
+  	# have to worry about silly parameter names...
+         my $qresult='';
+ 	my %data = ();                     # A hash of anonymous hashes..
+ 	while (my ($key,$value) = each(%$hashref)) {
+ 	    my ($v,$symb,$param) = split(/:/,$key);
+ 	    next if ($v eq 'version' || $symb eq 'keys');
+ 	    next if (exists($data{$symb}) &&
+ 		     exists($data{$symb}->{$param}) &&
+ 		     $data{$symb}->{'v.'.$param} > $v);
+ 	    $data{$symb}->{$param}=$value;
+ 	    $data{$symb}->{'v.'.$param}=$v;
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    while (my ($symb,$param_hash) = each(%data)) {
+ 		while(my ($param,$value) = each (%$param_hash)){
+ 		    next if ($param =~ /^v\./);       # Ignore versions...
+ 		    #
+ 		    #   Just dump the symb=value pairs separated by &
+ 		    #
+ 		    $qresult.=$symb.':'.$param.'='.$value.'&';
+ 		}
+ 	    }
+ 	    chop($qresult);
+ 	    &Reply($client , \$qresult, $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting currentdump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting currentdump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
+ #
+ #   Dump a profile database with an optional regular expression
+ #   to match against the keys.  In this dump, no effort is made
+ #   to separate symb from version information. Presumably the
+ #   databases that are dumped by this command are of a different
+ #   structure.  Need to look at this and improve the documentation of
+ #   both this and the currentdump handler.
+ # Parameters:
+ #    $cmd                     - The command keyword.
+ #    $tail                    - All of the characters after the $cmd:
+ #                               These are expected to be a colon
+ #                               separated list containing:
+ #                               domain/user - identifying the user.
+ #                               namespace   - identifying the database.
+ #                               regexp      - optional regular expression
+ #                                             that is matched against
+ #                                             database keywords to do
+ #                                             selective dumps.
+ #                               range       - optional range of entries
+ #                                             e.g., 10-20 would return the
+ #                                             10th to 19th items, etc.
+ #   $client                   - Channel open on the client.
+ # Returns:
+ #    1    - Continue processing.
+ # Side effects:
+ #    response is written to $client.
+ #
+ sub dump_with_regexp {
+     my ($cmd, $tail, $client) = @_;
+     my $res = LONCAPA::Lond::dump_with_regexp($tail, $clientversion);
+     if ($res =~ /^error:/) {
+         Failure($client, \$res, "$cmd:$tail");
+     } else {
+         Reply($client, \$res, "$cmd:$tail");
+     }
+     return 1;
+ }
+ &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
+ #  Store a set of key=value pairs associated with a versioned name.
+ #
+ #  Parameters:
+ #    $cmd                - Request command keyword.
+ #    $tail               - Tail of the request.  This is a colon
+ #                          separated list containing:
+ #                          domain/user - User and authentication domain.
+ #                          namespace   - Name of the database being modified
+ #                          rid         - Resource keyword to modify.
+ #                          what        - new value associated with rid.
+ #                          laststore   - (optional) version=timestamp
+ #                                        for most recent transaction for rid
+ #                                        in namespace, when cstore was called
+ #
+ #    $client             - Socket open on the client.
+ #
+ #
+ #  Returns:
+ #      1 (keep on processing).
+ #  Side-Effects:
+ #    Writes to the client
+ #    Successful storage will cause either 'ok', or, if $laststore was included
+ #    in the tail of the request, and the version number for the last transaction
+ #    is larger than the version in $laststore, delay:$numtrans , where $numtrans
+ #    is the number of store evevnts recorded for rid in namespace since
+ #    lonnet::store() was called by the client.
+ #
+ sub store_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     chomp($tail);
+     my ($udom,$uname,$namespace,$rid,$what,$laststore) =split(/:/,$tail);
+     if ($namespace ne 'roles') {
+ 	my @pairs=split(/\&/,$what);
+ 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
+ 				       &GDBM_WRCREAT(), "S",
+ 				       "$rid:$what");
+ 	if ($hashref) {
+ 	    my $now = time;
+             my $numtrans;
+             if ($laststore) {
+                 my ($previousversion,$previoustime) = split(/\=/,$laststore);
+                 my ($lastversion,$lasttime) = (0,0);
+                 $lastversion = $hashref->{"version:$rid"};
+                 if ($lastversion) {
+                     $lasttime = $hashref->{"$lastversion:$rid:timestamp"};
+                 }
+                 if (($previousversion) && ($previousversion !~ /\D/)) {
+                     if (($lastversion > $previousversion) && ($lasttime >= $previoustime)) {
+                         $numtrans = $lastversion - $previousversion;
+                     }
+                 } elsif ($lastversion) {
+                     $numtrans = $lastversion;
+                 }
+                 if ($numtrans) {
+                     $numtrans =~ s/D//g;
+                 }
+             }
+ 	    $hashref->{"version:$rid"}++;
+ 	    my $version=$hashref->{"version:$rid"};
+ 	    my $allkeys='';
+ 	    foreach my $pair (@pairs) {
+ 		my ($key,$value)=split(/=/,$pair);
+ 		$allkeys.=$key.':';
+ 		$hashref->{"$version:$rid:$key"}=$value;
+ 	    }
+ 	    $hashref->{"$version:$rid:timestamp"}=$now;
+ 	    $allkeys.='timestamp';
+ 	    $hashref->{"$version:keys:$rid"}=$allkeys;
+ 	    if (&untie_user_hash($hashref)) {
+                 my $msg = 'ok';
+                 if ($numtrans) {
+                     $msg = 'delay:'.$numtrans;
+                 }
+ 		&Reply($client, "$msg\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 			"while attempting store\n", $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting store\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("store", \&store_handler, 0, 1, 0);
+ #  Modify a set of key=value pairs associated with a versioned name.
+ #
+ #  Parameters:
+ #    $cmd                - Request command keyword.
+ #    $tail               - Tail of the request.  This is a colon
+ #                          separated list containing:
+ #                          domain/user - User and authentication domain.
+ #                          namespace   - Name of the database being modified
+ #                          rid         - Resource keyword to modify.
+ #                          v           - Version item to modify
+ #                          what        - new value associated with rid.
+ #
+ #    $client             - Socket open on the client.
+ #
+ #
+ #  Returns:
+ #      1 (keep on processing).
+ #  Side-Effects:
+ #    Writes to the client
+ sub putstore_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
+     if ($namespace ne 'roles') {
+ 	chomp($what);
+ 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
+ 				       &GDBM_WRCREAT(), "M",
+ 				       "$rid:$v:$what");
+ 	if ($hashref) {
+ 	    my $now = time;
+ 	    my %data = &hash_extract($what);
+ 	    my @allkeys;
+ 	    while (my($key,$value) = each(%data)) {
+ 		push(@allkeys,$key);
+ 		$hashref->{"$v:$rid:$key"} = $value;
+ 	    }
+ 	    my $allkeys = join(':',@allkeys);
+ 	    $hashref->{"$v:keys:$rid"}=$allkeys;
+ 	    if (&untie_user_hash($hashref)) {
+ 		&Reply($client, "ok\n", $userinput);
+ 	    } else {
+ 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 			"while attempting store\n", $userinput);
+ 	    }
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		     "while attempting store\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "refused\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("putstore", \&putstore_handler, 0, 1, 0);
+ sub hash_extract {
+     my ($str)=@_;
+     my %hash;
+     foreach my $pair (split(/\&/,$str)) {
+ 	my ($key,$value)=split(/=/,$pair);
+ 	$hash{$key}=$value;
+     }
+     return (%hash);
+ }
+ sub hash_to_str {
+     my ($hash_ref)=@_;
+     my $str;
+     foreach my $key (keys(%$hash_ref)) {
+ 	$str.=$key.'='.$hash_ref->{$key}.'&';
+     }
+     $str=~s/\&$//;
+     return $str;
+ }
+ #
+ #  Dump out all versions of a resource that has key=value pairs associated
+ # with it for each version.  These resources are built up via the store
+ # command.
+ #
+ #  Parameters:
+ #     $cmd               - Command keyword.
+ #     $tail              - Remainder of the request which consists of:
+ #                          domain/user   - User and auth. domain.
+ #                          namespace     - name of resource database.
+ #                          rid           - Resource id.
+ #    $client             - socket open on the client.
+ #
+ # Returns:
+ #      1  indicating the caller should not yet exit.
+ # Side-effects:
+ #   Writes a reply to the client.
+ #   The reply is a string of the following shape:
+ #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
+ #    Where the 1 above represents version 1.
+ #    this continues for all pairs of keys in all versions.
+ #
+ #
+ #
+ #
+ sub restore_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
+     my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
+     $namespace=~s/\//\_/g;
+     $namespace = &LONCAPA::clean_username($namespace);
+     chomp($rid);
+     my $qresult='';
+     my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
+     if ($hashref) {
+ 	my $version=$hashref->{"version:$rid"};
+ 	$qresult.="version=$version&";
+ 	my $scope;
+ 	for ($scope=1;$scope<=$version;$scope++) {
+ 	    my $vkeys=$hashref->{"$scope:keys:$rid"};
+ 	    my @keys=split(/:/,$vkeys);
+ 	    my $key;
+ 	    $qresult.="$scope:keys=$vkeys&";
+ 	    foreach $key (@keys) {
+ 		$qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
+ 	    }
+ 	}
+ 	if (&untie_user_hash($hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply( $client, \$qresult, $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting restore\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting restore\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("restore", \&restore_handler, 0,1,0);
+ #
+ #   Add a chat message to a synchronous discussion board.
+ #
+ # Parameters:
+ #    $cmd                - Request keyword.
+ #    $tail               - Tail of the command. A colon separated list
+ #                          containing:
+ #                          cdom    - Domain on which the chat board lives
+ #                          cnum    - Course containing the chat board.
+ #                          newpost - Body of the posting.
+ #                          group   - Optional group, if chat board is only
+ #                                    accessible in a group within the course
+ #   $client              - Socket open on the client.
+ # Returns:
+ #   1    - Indicating caller should keep on processing.
+ #
+ # Side-effects:
+ #   writes a reply to the client.
+ #
+ #
+ sub send_chat_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
+     &chat_add($cdom,$cnum,$newpost,$group);
+     &Reply($client, "ok\n", $userinput);
+     return 1;
+ }
+ &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
+ #
+ #   Retrieve the set of chat messages from a discussion board.
+ #
+ #  Parameters:
+ #    $cmd             - Command keyword that initiated the request.
+ #    $tail            - Remainder of the request after the command
+ #                       keyword.  In this case a colon separated list of
+ #                       chat domain    - Which discussion board.
+ #                       chat id        - Discussion thread(?)
+ #                       domain/user    - Authentication domain and username
+ #                                        of the requesting person.
+ #                       group          - Optional course group containing
+ #                                        the board.
+ #   $client           - Socket open on the client program.
+ # Returns:
+ #    1     - continue processing
+ # Side effects:
+ #    Response is written to the client.
+ #
+ sub retrieve_chat_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
+     my $reply='';
+     foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
+ 	$reply.=&escape($_).':';
+     }
+     $reply=~s/\:$//;
+     &Reply($client, \$reply, $userinput);
+     return 1;
+ }
+ &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
+ #
+ #  Initiate a query of an sql database.  SQL query repsonses get put in
+ #  a file for later retrieval.  This prevents sql query results from
+ #  bottlenecking the system.  Note that with loncnew, perhaps this is
+ #  less of an issue since multiple outstanding requests can be concurrently
+ #  serviced.
+ #
+ #  Parameters:
+ #     $cmd       - COmmand keyword that initiated the request.
+ #     $tail      - Remainder of the command after the keyword.
+ #                  For this function, this consists of a query and
+ #                  3 arguments that are self-documentingly labelled
+ #                  in the original arg1, arg2, arg3.
+ #     $client    - Socket open on the client.
+ # Return:
+ #    1   - Indicating processing should continue.
+ # Side-effects:
+ #    a reply is written to $client.
+ #
+ sub send_query_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
+     $query=~s/\n*$//g;
+     &Reply($client, "". &sql_reply("$clientname\&$query".
+ 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
+ 	  $userinput);
+     return 1;
+ }
+ &register_handler("querysend", \&send_query_handler, 0, 1, 0);
+ #
+ #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
+ #   The query is submitted via a "querysend" transaction.
+ #   There it is passed on to the lonsql daemon, queued and issued to
+ #   mysql.
+ #     This transaction is invoked when the sql transaction is complete
+ #   it stores the query results in flie and indicates query completion.
+ #   presumably local software then fetches this response... I'm guessing
+ #   the sequence is: lonc does a querysend, we ask lonsql to do it.
+ #   lonsql on completion of the query interacts with the lond of our
+ #   client to do a query reply storing two files:
+ #    - id     - The results of the query.
+ #    - id.end - Indicating the transaction completed.
+ #    NOTE: id is a unique id assigned to the query and querysend time.
+ # Parameters:
+ #    $cmd        - Command keyword that initiated this request.
+ #    $tail       - Remainder of the tail.  In this case that's a colon
+ #                  separated list containing the query Id and the
+ #                  results of the query.
+ #    $client     - Socket open on the client.
+ # Return:
+ #    1           - Indicating that we should continue processing.
+ # Side effects:
+ #    ok written to the client.
+ #
+ sub reply_query_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($id,$reply)=split(/:/,$tail);
+     my $store;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new(">$execdir/tmp/$id")) {
+ 	$reply=~s/\&/\n/g;
+ 	print $store $reply;
+ 	close $store;
+ 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
+ 	print $store2 "done\n";
+ 	close $store2;
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)
+ 		." IO::File->new Failed ".
+ 		"while attempting queryreply\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
+ #
+ #  Process the courseidput request.  Not quite sure what this means
+ #  at the system level sense.  It appears a gdbm file in the
+ #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
+ #  a set of entries made in that database.
+ #
+ # Parameters:
+ #   $cmd      - The command keyword that initiated this request.
+ #   $tail     - Tail of the command.  In this case consists of a colon
+ #               separated list contaning the domain to apply this to and
+ #               an ampersand separated list of keyword=value pairs.
+ #               Each value is a colon separated list that includes:
+ #               description, institutional code and course owner.
+ #               For backward compatibility with versions included
+ #               in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
+ #               code and/or course owner are preserved from the existing
+ #               record when writing a new record in response to 1.1 or
+ #               1.2 implementations of lonnet::flushcourselogs().
+ #
+ #   $client   - Socket open on the client.
+ # Returns:
+ #   1    - indicating that processing should continue
+ #
+ # Side effects:
+ #   reply is written to the client.
+ #
+ sub put_course_id_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom, $what) = split(/:/, $tail,2);
+     chomp($what);
+     my $now=time;
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+ 	foreach my $pair (@pairs) {
+             my ($key,$courseinfo) = split(/=/,$pair,2);
+             $courseinfo =~ s/=/:/g;
+             if (defined($hashref->{$key})) {
+                 my $value = &Apache::lonnet::thaw_unescape($hashref->{$key});
+                 if (ref($value) eq 'HASH') {
+                     my @items = ('description','inst_code','owner','type');
+                     my @new_items = split(/:/,$courseinfo,-1);
+                     my %storehash;
+                     for (my $i=0; $i<@new_items; $i++) {
+                         $storehash{$items[$i]} = &unescape($new_items[$i]);
+                     }
+                     $hashref->{$key} =
+                         &Apache::lonnet::freeze_escape(\%storehash);
+                     my $unesc_key = &unescape($key);
+                     $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
+                     next;
+                 }
+             }
+             my @current_items = split(/:/,$hashref->{$key},-1);
+             shift(@current_items); # remove description
+             pop(@current_items);   # remove last access
+             my $numcurrent = scalar(@current_items);
+             if ($numcurrent > 3) {
+                 $numcurrent = 3;
+             }
+             my @new_items = split(/:/,$courseinfo,-1);
+             my $numnew = scalar(@new_items);
+             if ($numcurrent > 0) {
+                 if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2
+                     for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
+                         $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
+                     }
+                 }
+             }
+             $hashref->{$key}=$courseinfo.':'.$now;
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    &Reply( $client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)
+ 		     ." untie(GDBM) Failed ".
+ 		     "while attempting courseidput\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)
+ 		 ." tie(GDBM) Failed ".
+ 		 "while attempting courseidput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
+ sub put_course_id_hash_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$mode,$what) = split(/:/, $tail,3);
+     chomp($what);
+     my $now=time;
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+         foreach my $pair (@pairs) {
+             my ($key,$value)=split(/=/,$pair);
+             my $unesc_key = &unescape($key);
+             if ($mode ne 'timeonly') {
+                 if (!defined($hashref->{&escape('lasttime:'.$unesc_key)})) {
+                     my $curritems = &Apache::lonnet::thaw_unescape($key);
+                     if (ref($curritems) ne 'HASH') {
+                         my @current_items = split(/:/,$hashref->{$key},-1);
+                         my $lasttime = pop(@current_items);
+                         $hashref->{&escape('lasttime:'.$unesc_key)} = $lasttime;
+                     } else {
+                         $hashref->{&escape('lasttime:'.$unesc_key)} = '';
+                     }
+                 }
+                 $hashref->{$key} = $value;
+             }
+             if ($mode ne 'notime') {
+                 $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
+             }
+         }
+         if (&untie_domain_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                      "while attempting courseidputhash\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting courseidputhash\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseidputhash", \&put_course_id_hash_handler, 0, 1, 0);
+ #  Retrieves the value of a course id resource keyword pattern
+ #  defined since a starting date.  Both the starting date and the
+ #  keyword pattern are optional.  If the starting date is not supplied it
+ #  is treated as the beginning of time.  If the pattern is not found,
+ #  it is treatred as "." matching everything.
+ #
+ #  Parameters:
+ #     $cmd     - Command keyword that resulted in us being dispatched.
+ #     $tail    - The remainder of the command that, in this case, consists
+ #                of a colon separated list of:
+ #                 domain   - The domain in which the course database is
+ #                            defined.
+ #                 since    - Optional parameter describing the minimum
+ #                            time of definition(?) of the resources that
+ #                            will match the dump.
+ #                 description - regular expression that is used to filter
+ #                            the dump.  Only keywords matching this regexp
+ #                            will be used.
+ #                 institutional code - optional supplied code to filter
+ #                            the dump. Only courses with an institutional code
+ #                            that match the supplied code will be returned.
+ #                 owner    - optional supplied username and domain of owner to
+ #                            filter the dump.  Only courses for which the course
+ #                            owner matches the supplied username and/or domain
+ #                            will be returned. Pre-2.2.0 legacy entries from
+ #                            nohist_courseiddump will only contain usernames.
+ #                 type     - optional parameter for selection
+ #                 regexp_ok - if 1 or -1 allow the supplied institutional code
+ #                            filter to behave as a regular expression:
+ #	                      1 will not exclude the course if the instcode matches the RE
+ #                            -1 will exclude the course if the instcode matches the RE
+ #                 rtn_as_hash - whether to return the information available for
+ #                            each matched item as a frozen hash of all
+ #                            key, value pairs in the item's hash, or as a
+ #                            colon-separated list of (in order) description,
+ #                            institutional code, and course owner.
+ #                 selfenrollonly - filter by courses allowing self-enrollment
+ #                                  now or in the future (selfenrollonly = 1).
+ #                 catfilter - filter by course category, assigned to a course
+ #                             using manually defined categories (i.e., not
+ #                             self-cataloging based on on institutional code).
+ #                 showhidden - include course in results even if course
+ #                              was set to be excluded from course catalog (DC only).
+ #                 caller -  if set to 'coursecatalog', courses set to be hidden
+ #                           from course catalog will be excluded from results (unless
+ #                           overridden by "showhidden".
+ #                 cloner - escaped username:domain of course cloner (if picking course to
+ #                          clone).
+ #                 cc_clone_list - escaped comma separated list of courses for which
+ #                                 course cloner has active CC role (and so can clone
+ #                                 automatically).
+ #                 cloneonly - filter by courses for which cloner has rights to clone.
+ #                 createdbefore - include courses for which creation date preceeded this date.
+ #                 createdafter - include courses for which creation date followed this date.
+ #                 creationcontext - include courses created in specified context
+ #
+ #                 domcloner - flag to indicate if user can create CCs in course's domain.
+ #                             If so, ability to clone course is automatic.
+ #                 hasuniquecode - filter by courses for which a six character unique code has
+ #                                 been set.
+ #
+ #     $client  - The socket open on the client.
+ # Returns:
+ #    1     - Continue processing.
+ # Side Effects:
+ #   a reply is written to $client.
+ sub dump_course_id_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $res = LONCAPA::Lond::dump_course_id_handler($tail);
+     if ($res =~ /^error:/) {
+         Failure($client, \$res, "$cmd:$tail");
+     } else {
+         Reply($client, \$res, "$cmd:$tail");
+     }
+     return 1;
+     #TODO remove
+     my $userinput = "$cmd:$tail";
+     my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
+         $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
+         $caller,$cloner,$cc_clone_list,$cloneonly,$createdbefore,$createdafter,
+         $creationcontext,$domcloner,$hasuniquecode) =split(/:/,$tail);
+     my $now = time;
+     my ($cloneruname,$clonerudom,%cc_clone);
+     if (defined($description)) {
+ 	$description=&unescape($description);
+     } else {
+ 	$description='.';
+     }
+     if (defined($instcodefilter)) {
+         $instcodefilter=&unescape($instcodefilter);
+     } else {
+         $instcodefilter='.';
+     }
+     my ($ownerunamefilter,$ownerdomfilter);
+     if (defined($ownerfilter)) {
+         $ownerfilter=&unescape($ownerfilter);
+         if ($ownerfilter ne '.' && defined($ownerfilter)) {
+             if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
+                  $ownerunamefilter = $1;
+                  $ownerdomfilter = $2;
+             } else {
+                 $ownerunamefilter = $ownerfilter;
+                 $ownerdomfilter = '';
+             }
+         }
+     } else {
+         $ownerfilter='.';
+     }
+     if (defined($coursefilter)) {
+         $coursefilter=&unescape($coursefilter);
+     } else {
+         $coursefilter='.';
+     }
+     if (defined($typefilter)) {
+         $typefilter=&unescape($typefilter);
+     } else {
+         $typefilter='.';
+     }
+     if (defined($regexp_ok)) {
+         $regexp_ok=&unescape($regexp_ok);
+     }
+     if (defined($catfilter)) {
+         $catfilter=&unescape($catfilter);
+     }
+     if (defined($cloner)) {
+         $cloner = &unescape($cloner);
+         ($cloneruname,$clonerudom) = ($cloner =~ /^($LONCAPA::match_username):($LONCAPA::match_domain)$/);
+     }
+     if (defined($cc_clone_list)) {
+         $cc_clone_list = &unescape($cc_clone_list);
+         my @cc_cloners = split('&',$cc_clone_list);
+         foreach my $cid (@cc_cloners) {
+             my ($clonedom,$clonenum) = split(':',$cid);
+             next if ($clonedom ne $udom);
+             $cc_clone{$clonedom.'_'.$clonenum} = 1;
+         }
+     }
+     if ($createdbefore ne '') {
+         $createdbefore = &unescape($createdbefore);
+     } else {
+        $createdbefore = 0;
+     }
+     if ($createdafter ne '') {
+         $createdafter = &unescape($createdafter);
+     } else {
+         $createdafter = 0;
+     }
+     if ($creationcontext ne '') {
+         $creationcontext = &unescape($creationcontext);
+     } else {
+         $creationcontext = '.';
+     }
+     unless ($hasuniquecode) {
+         $hasuniquecode = '.';
+     }
+     my $unpack = 1;
+     if ($description eq '.' && $instcodefilter eq '.' && $ownerfilter eq '.' &&
+         $typefilter eq '.') {
+         $unpack = 0;
+     }
+     if (!defined($since)) { $since=0; }
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+ 	while (my ($key,$value) = each(%$hashref)) {
+             my ($unesc_key,$lasttime_key,$lasttime,$is_hash,%val,
+                 %unesc_val,$selfenroll_end,$selfenroll_types,$created,
+                 $context);
+             $unesc_key = &unescape($key);
+             if ($unesc_key =~ /^lasttime:/) {
+                 next;
+             } else {
+                 $lasttime_key = &escape('lasttime:'.$unesc_key);
+             }
+             if ($hashref->{$lasttime_key} ne '') {
+                 $lasttime = $hashref->{$lasttime_key};
+                 next if ($lasttime<$since);
+             }
+             my ($canclone,$valchange);
+             my $items = &Apache::lonnet::thaw_unescape($value);
+             if (ref($items) eq 'HASH') {
+                 if ($hashref->{$lasttime_key} eq '') {
+                     next if ($since > 1);
+                 }
+                 $is_hash =  1;
+                 if ($domcloner) {
+                     $canclone = 1;
+                 } elsif (defined($clonerudom)) {
+                     if ($items->{'cloners'}) {
+                         my @cloneable = split(',',$items->{'cloners'});
+                         if (@cloneable) {
+                             if (grep(/^\*$/,@cloneable))  {
+                                 $canclone = 1;
+                             } elsif (grep(/^\*:\Q$clonerudom\E$/,@cloneable)) {
+                                 $canclone = 1;
+                             } elsif (grep(/^\Q$cloneruname\E:\Q$clonerudom\E$/,@cloneable)) {
+                                 $canclone = 1;
+                             }
+                         }
+                         unless ($canclone) {
+                             if ($cloneruname ne '' && $clonerudom ne '') {
+                                 if ($cc_clone{$unesc_key}) {
+                                     $canclone = 1;
+                                     $items->{'cloners'} .= ','.$cloneruname.':'.
+                                                            $clonerudom;
+                                     $valchange = 1;
+                                 }
+                             }
+                         }
+                     } elsif (defined($cloneruname)) {
+                         if ($cc_clone{$unesc_key}) {
+                             $canclone = 1;
+                             $items->{'cloners'} = $cloneruname.':'.$clonerudom;
+                             $valchange = 1;
+                         }
+                         unless ($canclone) {
+                             if ($items->{'owner'} =~ /:/) {
+                                 if ($items->{'owner'} eq $cloner) {
+                                     $canclone = 1;
+                                 }
+                             } elsif ($cloner eq $items->{'owner'}.':'.$udom) {
+                                 $canclone = 1;
+                             }
+                             if ($canclone) {
+                                 $items->{'cloners'} = $cloneruname.':'.$clonerudom;
+                                 $valchange = 1;
+                             }
+                         }
+                     }
+                 }
+                 if ($unpack || !$rtn_as_hash) {
+                     $unesc_val{'descr'} = $items->{'description'};
+                     $unesc_val{'inst_code'} = $items->{'inst_code'};
+                     $unesc_val{'owner'} = $items->{'owner'};
+                     $unesc_val{'type'} = $items->{'type'};
+                     $unesc_val{'cloners'} = $items->{'cloners'};
+                     $unesc_val{'created'} = $items->{'created'};
+                     $unesc_val{'context'} = $items->{'context'};
+                 }
+                 $selfenroll_types = $items->{'selfenroll_types'};
+                 $selfenroll_end = $items->{'selfenroll_end_date'};
+                 $created = $items->{'created'};
+                 $context = $items->{'context'};
+                 if ($hasuniquecode ne '.') {
+                     next unless ($items->{'uniquecode'});
+                 }
+                 if ($selfenrollonly) {
+                     next if (!$selfenroll_types);
+                     if (($selfenroll_end > 0) && ($selfenroll_end <= $now)) {
+                         next;
+                     }
+                 }
+                 if ($creationcontext ne '.') {
+                     next if (($context ne '') && ($context ne $creationcontext));
+                 }
+                 if ($createdbefore > 0) {
+                     next if (($created eq '') || ($created > $createdbefore));
+                 }
+                 if ($createdafter > 0) {
+                     next if (($created eq '') || ($created <= $createdafter));
+                 }
+                 if ($catfilter ne '') {
+                     next if ($items->{'categories'} eq '');
+                     my @categories = split('&',$items->{'categories'});
+                     next if (@categories == 0);
+                     my @subcats = split('&',$catfilter);
+                     my $matchcat = 0;
+                     foreach my $cat (@categories) {
+                         if (grep(/^\Q$cat\E$/,@subcats)) {
+                             $matchcat = 1;
+                             last;
+                         }
+                     }
+                     next if (!$matchcat);
+                 }
+                 if ($caller eq 'coursecatalog') {
+                     if ($items->{'hidefromcat'} eq 'yes') {
+                         next if !$showhidden;
+                     }
+                 }
+             } else {
+                 next if ($catfilter ne '');
+                 next if ($selfenrollonly);
+                 next if ($createdbefore || $createdafter);
+                 next if ($creationcontext ne '.');
+                 if ((defined($clonerudom)) && (defined($cloneruname)))  {
+                     if ($cc_clone{$unesc_key}) {
+                         $canclone = 1;
+                         $val{'cloners'} = &escape($cloneruname.':'.$clonerudom);
+                     }
+                 }
+                 $is_hash =  0;
+                 my @courseitems = split(/:/,$value);
+                 $lasttime = pop(@courseitems);
+                 if ($hashref->{$lasttime_key} eq '') {
+                     next if ($lasttime<$since);
+                 }
+ 	        ($val{'descr'},$val{'inst_code'},$val{'owner'},$val{'type'}) = @courseitems;
+             }
+             if ($cloneonly) {
+                next unless ($canclone);
+             }
+             my $match = 1;
+ 	    if ($description ne '.') {
+                 if (!$is_hash) {
+                     $unesc_val{'descr'} = &unescape($val{'descr'});
+                 }
+                 if (eval{$unesc_val{'descr'} !~ /\Q$description\E/i}) {
+                     $match = 0;
+                 }
+             }
+             if ($instcodefilter ne '.') {
+                 if (!$is_hash) {
+                     $unesc_val{'inst_code'} = &unescape($val{'inst_code'});
+                 }
+                 if ($regexp_ok == 1) {
+                     if (eval{$unesc_val{'inst_code'} !~ /$instcodefilter/}) {
+                         $match = 0;
+                     }
+                 } elsif ($regexp_ok == -1) {
+                     if (eval{$unesc_val{'inst_code'} =~ /$instcodefilter/}) {
+                         $match = 0;
+                     }
+                 } else {
+                     if (eval{$unesc_val{'inst_code'} !~ /\Q$instcodefilter\E/i}) {
+                         $match = 0;
+                     }
+                 }
+ 	    }
+             if ($ownerfilter ne '.') {
+                 if (!$is_hash) {
+                     $unesc_val{'owner'} = &unescape($val{'owner'});
+                 }
+                 if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
+                     if ($unesc_val{'owner'} =~ /:/) {
+                         if (eval{$unesc_val{'owner'} !~
+                              /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i}) {
+                             $match = 0;
+                         }
+                     } else {
+                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
+                             $match = 0;
+                         }
+                     }
+                 } elsif ($ownerunamefilter ne '') {
+                     if ($unesc_val{'owner'} =~ /:/) {
+                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E:[^:]+$/i}) {
+                              $match = 0;
+                         }
+                     } else {
+                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
+                             $match = 0;
+                         }
+                     }
+                 } elsif ($ownerdomfilter ne '') {
+                     if ($unesc_val{'owner'} =~ /:/) {
+                         if (eval{$unesc_val{'owner'} !~ /^[^:]+:\Q$ownerdomfilter\E/}) {
+                              $match = 0;
+                         }
+                     } else {
+                         if ($ownerdomfilter ne $udom) {
+                             $match = 0;
+                         }
+                     }
+                 }
+             }
+             if ($coursefilter ne '.') {
+                 if (eval{$unesc_key !~ /^$udom(_)\Q$coursefilter\E$/}) {
+                     $match = 0;
+                 }
+             }
+             if ($typefilter ne '.') {
+                 if (!$is_hash) {
+                     $unesc_val{'type'} = &unescape($val{'type'});
+                 }
+                 if ($unesc_val{'type'} eq '') {
+                     if ($typefilter ne 'Course') {
+                         $match = 0;
+                     }
+                 } else {
+                     if (eval{$unesc_val{'type'} !~ /^\Q$typefilter\E$/}) {
+                         $match = 0;
+                     }
+                 }
+             }
+             if ($match == 1) {
+                 if ($rtn_as_hash) {
+                     if ($is_hash) {
+                         if ($valchange) {
+                             my $newvalue = &Apache::lonnet::freeze_escape($items);
+                             $qresult.=$key.'='.$newvalue.'&';
+                         } else {
+                             $qresult.=$key.'='.$value.'&';
+                         }
+                     } else {
+                         my %rtnhash = ( 'description' => &unescape($val{'descr'}),
+                                         'inst_code' => &unescape($val{'inst_code'}),
+                                         'owner'     => &unescape($val{'owner'}),
+                                         'type'      => &unescape($val{'type'}),
+                                         'cloners'   => &unescape($val{'cloners'}),
+                                       );
+                         my $items = &Apache::lonnet::freeze_escape(\%rtnhash);
+                         $qresult.=$key.'='.$items.'&';
+                     }
+                 } else {
+                     if ($is_hash) {
+                         $qresult .= $key.'='.&escape($unesc_val{'descr'}).':'.
+                                     &escape($unesc_val{'inst_code'}).':'.
+                                     &escape($unesc_val{'owner'}).'&';
+                     } else {
+                         $qresult .= $key.'='.$val{'descr'}.':'.$val{'inst_code'}.
+                                     ':'.$val{'owner'}.'&';
+                     }
+                 }
+             }
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    chop($qresult);
+ 	    &Reply($client, \$qresult, $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		    "while attempting courseiddump\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		"while attempting courseiddump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
+ sub course_lastaccess_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum) = split(':',$tail);
+     my (%lastaccess,$qresult);
+     my $hashref = &tie_domain_hash($cdom, "nohist_courseids", &GDBM_WRCREAT());
+     if ($hashref) {
+         while (my ($key,$value) = each(%$hashref)) {
+             my ($unesc_key,$lasttime);
+             $unesc_key = &unescape($key);
+             if ($cnum) {
+                 next unless ($unesc_key =~ /\Q$cdom\E_\Q$cnum\E$/);
+             }
+             if ($unesc_key =~ /^lasttime:($LONCAPA::match_domain\_$LONCAPA::match_courseid)/) {
+                 $lastaccess{$1} = $value;
+             } else {
+                 my $items = &Apache::lonnet::thaw_unescape($value);
+                 if (ref($items) eq 'HASH') {
+                     unless ($lastaccess{$unesc_key}) {
+                         $lastaccess{$unesc_key} = '';
+                     }
+                 } else {
+                     my @courseitems = split(':',$value);
+                     $lastaccess{$unesc_key} = pop(@courseitems);
+                 }
+             }
+         }
+         foreach my $cid (sort(keys(%lastaccess))) {
+             $qresult.=&escape($cid).'='.$lastaccess{$cid}.'&';
+         }
+         if (&untie_domain_hash($hashref)) {
+             if ($qresult) {
+                 chop($qresult);
+             }
+             &Reply($client, \$qresult, $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                     "while attempting lastacourseaccess\n", $userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting lastcourseaccess\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("courselastaccess",\&course_lastaccess_handler, 0, 1, 0);
+ #
+ # Puts an unencrypted entry in a namespace db file at the domain level
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     0        - Requested to exit, caller should shut down.
+ #     1        - Continue processing.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub put_domain_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$namespace,$what) =split(/:/,$tail,3);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
+                                    "P", $what);
+     if ($hashref) {
+         foreach my $pair (@pairs) {
+             my ($key,$value)=split(/=/,$pair);
+             $hashref->{$key}=$value;
+         }
+         if (&untie_domain_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                      "while attempting putdom\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting putdom\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
+ # Updates one or more entries in clickers.db file at the domain level
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #                In this case a colon separated list containing:
+ #                (a) the domain for which we are updating the entries,
+ #                (b) the action required -- add or del -- and
+ #                (c) a &-separated list of entries to add or delete.
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     1        - Continue processing.
+ #     0        - Requested to exit, caller should shut down.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub update_clickers {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$action,$what) =split(/:/,$tail,3);
+     chomp($what);
+     my $hashref = &tie_domain_hash($udom, "clickers", &GDBM_WRCREAT(),
+                                  "U","$action:$what");
+     if (!$hashref) {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting updateclickers\n", $userinput);
+         return 1;
+     }
+     my @pairs=split(/\&/,$what);
+     foreach my $pair (@pairs) {
+         my ($key,$value)=split(/=/,$pair);
+         if ($action eq 'add') {
+             if (exists($hashref->{$key})) {
+                 my @newvals = split(/,/,&unescape($value));
+                 my @currvals = split(/,/,&unescape($hashref->{$key}));
+                 my @merged = sort(keys(%{{map { $_ => 1 } (@newvals,@currvals)}}));
+                 $hashref->{$key}=&escape(join(',',@merged));
+             } else {
+                 $hashref->{$key}=$value;
+             }
+         } elsif ($action eq 'del') {
+             if (exists($hashref->{$key})) {
+                 my %current;
+                 map { $current{$_} = 1; } split(/,/,&unescape($hashref->{$key}));
+                 map { delete($current{$_}); } split(/,/,&unescape($value));
+                 if (keys(%current)) {
+                     $hashref->{$key}=&escape(join(',',sort(keys(%current))));
+                 } else {
+                     delete($hashref->{$key});
+                 }
+             }
+         }
+     }
+     if (&untie_user_hash($hashref)) {
+         &Reply( $client, "ok\n", $userinput);
+     } else {
+         &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+                  "while attempting put\n",
+                  $userinput);
+     }
+     return 1;
+ }
+ &register_handler("updateclickers", \&update_clickers, 0, 1, 0);
+ # Deletes one or more entries in a namespace db file at the domain level
+ #
+ # Parameters:
+ #    $cmd      - The command that got us here.
+ #    $tail     - Tail of the command (remaining parameters).
+ #                In this case a colon separated list containing:
+ #                (a) the domain for which we are deleting the entries,
+ #                (b) &-separated list of keys to delete.
+ #    $client   - File descriptor connected to client.
+ # Returns
+ #     1        - Continue processing.
+ #     0        - Requested to exit, caller should shut down.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub del_domain_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$namespace,$what)=split(/:/,$tail,3);
+     chomp($what);
+     my $hashref = &tie_domain_hash($udom,$namespace,&GDBM_WRCREAT(),
+                                    "D", $what);
+     if ($hashref) {
+         my @keys=split(/\&/,$what);
+         foreach my $key (@keys) {
+             delete($hashref->{$key});
+         }
+         if (&untie_user_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                     "while attempting deldom\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                  "while attempting deldom\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("deldom", \&del_domain_handler, 0, 1, 0);
+ # Unencrypted get from the namespace database file at the domain level.
+ # This function retrieves a keyed item from a specific named database in the
+ # domain directory.
+ #
+ # Parameters:
+ #   $cmd             - Command request keyword (get).
+ #   $tail            - Tail of the command.  This is a colon separated list
+ #                      consisting of the domain and the 'namespace'
+ #                      which selects the gdbm file to do the lookup in,
+ #                      & separated list of keys to lookup.  Note that
+ #                      the values are returned as an & separated list too.
+ #   $client          - File descriptor open on the client.
+ # Returns:
+ #   1       - Continue processing.
+ #   0       - Exit.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub get_domain_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$client:$tail";
+     my ($udom,$namespace,$what)=split(/:/,$tail,3);
+     chomp($what);
+     my @queries=split(/\&/,$what);
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
+     if ($hashref) {
+         for (my $i=0;$i<=$#queries;$i++) {
+             $qresult.="$hashref->{$queries[$i]}&";
+         }
+         if (&untie_domain_hash($hashref)) {
+             $qresult=~s/\&$//;
+             &Reply($client, \$qresult, $userinput);
+         } else {
+             &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+                       "while attempting getdom\n",$userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                  "while attempting getdom\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
+ #
+ #  Puts an id to a domains id database.
+ #
+ #  Parameters:
+ #   $cmd     - The command that triggered us.
+ #   $tail    - Remainder of the request other than the command. This is a
+ #              colon separated list containing:
+ #              $domain  - The domain for which we are writing the id.
+ #              $pairs  - The id info to write... this is and & separated list
+ #                        of keyword=value.
+ #   $client  - Socket open on the client.
+ #  Returns:
+ #    1   - Continue processing.
+ #  Side effects:
+ #     reply is written to $client.
+ #
+ sub put_id_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
+ 				   "P", $what);
+     if ($hashref) {
+ 	foreach my $pair (@pairs) {
+ 	    my ($key,$value)=split(/=/,$pair);
+ 	    $hashref->{$key}=$value;
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    &Reply($client, "ok\n", $userinput);
+ 	} else {
+ 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		     "while attempting idput\n", $userinput);
+ 	}
+     } else {
+ 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		  "while attempting idput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("idput", \&put_id_handler, 0, 1, 0);
+ #
+ #  Retrieves a set of id values from the id database.
+ #  Returns an & separated list of results, one for each requested id to the
+ #  client.
+ #
+ # Parameters:
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose id table we dump
+ #               ids      Consists of an & separated list of
+ #                        id keywords whose values will be fetched.
+ #                        nonexisting keywords will have an empty value.
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects:
+ #   An & separated list of results is written to $client.
+ #
+ sub get_id_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$client:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my @queries=split(/\&/,$what);
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
+     if ($hashref) {
+ 	for (my $i=0;$i<=$#queries;$i++) {
+ 	    $qresult.="$hashref->{$queries[$i]}&";
+ 	}
+ 	if (&untie_domain_hash($hashref)) {
+ 	    $qresult=~s/\&$//;
+ 	    &Reply($client, \$qresult, $userinput);
+ 	} else {
+ 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
+ 		      "while attempting idget\n",$userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+ 		 "while attempting idget\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("idget", \&get_id_handler, 0, 1, 0);
+ #   Deletes one or more ids in a domain's id database.
+ #
+ #   Parameters:
+ #       $cmd                  - Command keyword (iddel).
+ #       $tail                 - Command tail.  In this case a colon
+ #                               separated list containing:
+ #                               The domain for which we are deleting the id(s).
+ #                               &-separated list of id(s) to delete.
+ #       $client               - File open on client socket.
+ # Returns:
+ #     1   - Continue processing
+ #     0   - Exit server.
+ #
+ #
+ sub del_id_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
+                                    "D", $what);
+     if ($hashref) {
+         my @keys=split(/\&/,$what);
+         foreach my $key (@keys) {
+             delete($hashref->{$key});
+         }
+         if (&untie_user_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                     "while attempting iddel\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                  "while attempting iddel\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("iddel", \&del_id_handler, 0, 1, 0);
+ #
+ # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose dcmail we are recording
+ #               email    Consists of key=value pair
+ #                        where key is unique msgid
+ #                        and value is message (in XML)
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply is written to $client.
+ #
+ sub put_dcmail_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
+     if ($hashref) {
+         my ($key,$value)=split(/=/,$what);
+         $hashref->{$key}=$value;
+     }
+     if (&untie_domain_hash($hashref)) {
+         &Reply($client, "ok\n", $userinput);
+     } else {
+         &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                  "while attempting dcmailput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
+ #
+ # Retrieves broadcast e-mail from nohist_dcmail database
+ # Returns to client an & separated list of key=value pairs,
+ # where key is msgid and value is message information.
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose dcmail table we dump
+ #               startfilter - beginning of time window
+ #               endfilter - end of time window
+ #               sendersfilter - & separated list of username:domain
+ #                 for senders to search for.
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply (& separated list of msgid=messageinfo pairs) is
+ #     written to $client.
+ #
+ sub dump_dcmail_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
+     chomp($sendersfilter);
+     my @senders = ();
+     if (defined($startfilter)) {
+         $startfilter=&unescape($startfilter);
+     } else {
+         $startfilter='.';
+     }
+     if (defined($endfilter)) {
+         $endfilter=&unescape($endfilter);
+     } else {
+         $endfilter='.';
+     }
+     if (defined($sendersfilter)) {
+         $sendersfilter=&unescape($sendersfilter);
+ 	@senders = map { &unescape($_) } split(/\&/,$sendersfilter);
+     }
+     my $qresult='';
+     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
+     if ($hashref) {
+         while (my ($key,$value) = each(%$hashref)) {
+             my $match = 1;
+             my ($timestamp,$subj,$uname,$udom) =
+ 		split(/:/,&unescape(&unescape($key)),5); # yes, twice really
+             $subj = &unescape($subj);
+             unless ($startfilter eq '.' || !defined($startfilter)) {
+                 if ($timestamp < $startfilter) {
+                     $match = 0;
+                 }
+             }
+             unless ($endfilter eq '.' || !defined($endfilter)) {
+                 if ($timestamp > $endfilter) {
+                     $match = 0;
+                 }
+             }
+             unless (@senders < 1) {
+                 unless (grep/^$uname:$udom$/,@senders) {
+                     $match = 0;
+                 }
+             }
+             if ($match == 1) {
+                 $qresult.=$key.'='.$value.'&';
+             }
+         }
+         if (&untie_domain_hash($hashref)) {
+             chop($qresult);
+             &Reply($client, \$qresult, $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                     "while attempting dcmaildump\n", $userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting dcmaildump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
+ #
+ # Puts domain roles in nohist_domainroles database
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose roles we are recording
+ #               role -   Consists of key=value pair
+ #                        where key is unique role
+ #                        and value is start/end date information
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply is written to $client.
+ #
+ sub put_domainroles_handler {
+     my ($cmd,$tail,$client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$what)=split(/:/,$tail);
+     chomp($what);
+     my @pairs=split(/\&/,$what);
+     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
+     if ($hashref) {
+         foreach my $pair (@pairs) {
+             my ($key,$value)=split(/=/,$pair);
+             $hashref->{$key}=$value;
+         }
+         if (&untie_domain_hash($hashref)) {
+             &Reply($client, "ok\n", $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                      "while attempting domroleput\n", $userinput);
+         }
+     } else {
+         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                   "while attempting domroleput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
+ #
+ # Retrieves domain roles from nohist_domainroles database
+ # Returns to client an & separated list of key=value pairs,
+ # where key is role and value is start and end date information.
+ #
+ # Parameters
+ #   $cmd       - Command keyword that caused us to be dispatched.
+ #   $tail      - Tail of the command.  Consists of a colon separated:
+ #               domain - the domain whose domain roles table we dump
+ #   $client    - Socket open on the client.
+ #
+ # Returns:
+ #    1 - indicating processing should continue.
+ # Side effects
+ #     reply (& separated list of role=start/end info pairs) is
+ #     written to $client.
+ #
+ sub dump_domainroles_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
+     chomp($rolesfilter);
+     my @roles = ();
+     if (defined($startfilter)) {
+         $startfilter=&unescape($startfilter);
+     } else {
+         $startfilter='.';
+     }
+     if (defined($endfilter)) {
+         $endfilter=&unescape($endfilter);
+     } else {
+         $endfilter='.';
+     }
+     if (defined($rolesfilter)) {
+         $rolesfilter=&unescape($rolesfilter);
+ 	@roles = split(/\&/,$rolesfilter);
+     }
+     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
+     if ($hashref) {
+         my $qresult = '';
+         while (my ($key,$value) = each(%$hashref)) {
+             my $match = 1;
+             my ($end,$start) = split(/:/,&unescape($value));
+             my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
+             unless (@roles < 1) {
+                 unless (grep/^\Q$trole\E$/,@roles) {
+                     $match = 0;
+                     next;
+                 }
+             }
+             unless ($startfilter eq '.' || !defined($startfilter)) {
+                 if ((defined($start)) && ($start >= $startfilter)) {
+                     $match = 0;
+                     next;
+                 }
+             }
+             unless ($endfilter eq '.' || !defined($endfilter)) {
+                 if ((defined($end)) && (($end > 0) && ($end <= $endfilter))) {
+                     $match = 0;
+                     next;
+                 }
+             }
+             if ($match == 1) {
+                 $qresult.=$key.'='.$value.'&';
+             }
+         }
+         if (&untie_domain_hash($hashref)) {
+             chop($qresult);
+             &Reply($client, \$qresult, $userinput);
+         } else {
+             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                     "while attempting domrolesdump\n", $userinput);
+         }
+     } else {
+         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting domrolesdump\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
+ #  Process the tmpput command I'm not sure what this does.. Seems to
+ #  create a file in the lonDaemons/tmp directory of the form $id.tmp
+ # where Id is the client's ip concatenated with a sequence number.
+ # The file will contain some value that is passed in.  Is this e.g.
+ # a login token?
+ #
+ # Parameters:
+ #    $cmd     - The command that got us dispatched.
+ #    $tail    - The remainder of the request following $cmd:
+ #               In this case this will be the contents of the file.
+ #    $client  - Socket connected to the client.
+ # Returns:
+ #    1 indicating processing can continue.
+ # Side effects:
+ #   A file is created in the local filesystem.
+ #   A reply is sent to the client.
+ sub tmp_put_handler {
+     my ($cmd, $what, $client) = @_;
+     my $userinput = "$cmd:$what";	# Reconstruct for logging.
+     my ($record,$context) = split(/:/,$what);
+     if ($context ne '') {
+         chomp($context);
+         $context = &unescape($context);
+     }
+     my ($id,$store);
+     $tmpsnum++;
+     if (($context eq 'resetpw') || ($context eq 'createaccount')) {
+         $id = &md5_hex(&md5_hex(time.{}.rand().$$));
+     } else {
+         $id = $$.'_'.$clientip.'_'.$tmpsnum;
+     }
+     $id=~s/\W/\_/g;
+     $record=~s/\n//g;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
+ 	print $store $record;
+ 	close $store;
+ 	&Reply($client, \$id, $userinput);
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
+ 		  "while attempting tmpput\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
+ #   Processes the tmpget command.  This command returns the contents
+ #  of a temporary resource file(?) created via tmpput.
+ #
+ # Paramters:
+ #    $cmd      - Command that got us dispatched.
+ #    $id       - Tail of the command, contain the id of the resource
+ #                we want to fetch.
+ #    $client   - socket open on the client.
+ # Return:
+ #    1         - Inidcating processing can continue.
+ # Side effects:
+ #   A reply is sent to the client.
+ #
+ sub tmp_get_handler {
+     my ($cmd, $id, $client) = @_;
+     my $userinput = "$cmd:$id";
+     $id=~s/\W/\_/g;
+     my $store;
+     my $execdir=$perlvar{'lonDaemons'};
+     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
+ 	my $reply=<$store>;
+ 	&Reply( $client, \$reply, $userinput);
+ 	close $store;
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
+ 		  "while attempting tmpget\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
+ #
+ #  Process the tmpdel command.  This command deletes a temp resource
+ #  created by the tmpput command.
+ #
+ # Parameters:
+ #   $cmd      - Command that got us here.
+ #   $id       - Id of the temporary resource created.
+ #   $client   - socket open on the client process.
+ #
+ # Returns:
+ #   1     - Indicating processing should continue.
+ # Side Effects:
+ #   A file is deleted
+ #   A reply is sent to the client.
+ sub tmp_del_handler {
+     my ($cmd, $id, $client) = @_;
+     my $userinput= "$cmd:$id";
+     chomp($id);
+     $id=~s/\W/\_/g;
+     my $execdir=$perlvar{'lonDaemons'};
+     if (unlink("$execdir/tmp/$id.tmp")) {
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
+ 		  "while attempting tmpdel\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
+ #
+ #   Processes the setannounce command.  This command
+ #   creates a file named announce.txt in the top directory of
+ #   the documentn root and sets its contents.  The announce.txt file is
+ #   printed in its entirety at the LonCAPA login page.  Note:
+ #   once the announcement.txt fileis created it cannot be deleted.
+ #   However, setting the contents of the file to empty removes the
+ #   announcement from the login page of loncapa so who cares.
+ #
+ # Parameters:
+ #    $cmd          - The command that got us dispatched.
+ #    $announcement - The text of the announcement.
+ #    $client       - Socket open on the client process.
+ # Retunrns:
+ #   1             - Indicating request processing should continue
+ # Side Effects:
+ #   The file {DocRoot}/announcement.txt is created.
+ #   A reply is sent to $client.
+ #
+ sub set_announce_handler {
+     my ($cmd, $announcement, $client) = @_;
+     my $userinput    = "$cmd:$announcement";
+     chomp($announcement);
+     $announcement=&unescape($announcement);
+     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
+ 				'/announcement.txt')) {
+ 	print $store $announcement;
+ 	close $store;
+ 	&Reply($client, "ok\n", $userinput);
+     } else {
+ 	&Failure($client, "error: ".($!+0)."\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
+ #
+ #  Return the version of the daemon.  This can be used to determine
+ #  the compatibility of cross version installations or, alternatively to
+ #  simply know who's out of date and who isn't.  Note that the version
+ #  is returned concatenated with the tail.
+ # Parameters:
+ #   $cmd        - the request that dispatched to us.
+ #   $tail       - Tail of the request (client's version?).
+ #   $client     - Socket open on the client.
+ #Returns:
+ #   1 - continue processing requests.
+ # Side Effects:
+ #   Replies with version to $client.
+ sub get_version_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput  = $cmd.$tail;
+     &Reply($client, &version($userinput)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("version", \&get_version_handler, 0, 1, 0);
+ #  Set the current host and domain.  This is used to support
+ #  multihomed systems.  Each IP of the system, or even separate daemons
+ #  on the same IP can be treated as handling a separate lonCAPA virtual
+ #  machine.  This command selects the virtual lonCAPA.  The client always
+ #  knows the right one since it is lonc and it is selecting the domain/system
+ #  from the hosts.tab file.
+ # Parameters:
+ #    $cmd      - Command that dispatched us.
+ #    $tail     - Tail of the command (domain/host requested).
+ #    $socket   - Socket open on the client.
+ #
+ # Returns:
+ #     1   - Indicates the program should continue to process requests.
+ # Side-effects:
+ #     The default domain/system context is modified for this daemon.
+ #     a reply is sent to the client.
+ #
+ sub set_virtual_host_handler {
+     my ($cmd, $tail, $socket) = @_;
+     my $userinput  ="$cmd:$tail";
+     &Reply($client, &sethost($userinput)."\n", $userinput);
+     return 1;
+ }
+ &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
+ #  Process a request to exit:
+ #   - "bye" is sent to the client.
+ #   - The client socket is shutdown and closed.
+ #   - We indicate to the caller that we should exit.
+ # Formal Parameters:
+ #   $cmd                - The command that got us here.
+ #   $tail               - Tail of the command (empty).
+ #   $client             - Socket open on the tail.
+ # Returns:
+ #   0      - Indicating the program should exit!!
+ #
+ sub exit_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     &logthis("Client $clientip ($clientname) hanging up: $userinput");
+     &Reply($client, "bye\n", $userinput);
+     $client->shutdown(2);        # shutdown the socket forcibly.
+     $client->close();
+     return 0;
+ }
+ &register_handler("exit", \&exit_handler, 0,1,1);
+ &register_handler("init", \&exit_handler, 0,1,1);
+ &register_handler("quit", \&exit_handler, 0,1,1);
+ #  Determine if auto-enrollment is enabled.
+ #  Note that the original had what I believe to be a defect.
+ #  The original returned 0 if the requestor was not a registerd client.
+ #  It should return "refused".
+ # Formal Parameters:
+ #   $cmd       - The command that invoked us.
+ #   $tail      - The tail of the command (Extra command parameters.
+ #   $client    - The socket open on the client that issued the request.
+ # Returns:
+ #    1         - Indicating processing should continue.
+ #
+ sub enrollment_enabled_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = $cmd.":".$tail; # For logging purposes.
+     my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
+     my $outcome  = &localenroll::run($cdom);
+     &Reply($client, \$outcome, $userinput);
+     return 1;
+ }
+ &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
+ #
+ #   Validate an institutional code used for a LON-CAPA course.
+ #
+ # Formal Parameters:
+ #   $cmd          - The command request that got us dispatched.
+ #   $tail         - The tail of the command.  In this case,
+ #                   this is a colon separated set of words that will be split
+ #                   into:
+ #                        $dom      - The domain for which the check of
+ #                                    institutional course code will occur.
+ #
+ #                        $instcode - The institutional code for the course
+ #                                    being requested, or validated for rights
+ #                                    to request.
+ #
+ #                        $owner    - The course requestor (who will be the
+ #                                    course owner, in the form username:domain
+ #
+ #   $client       - Socket open on the client.
+ # Returns:
+ #    1           - Indicating processing should continue.
+ #
+ sub validate_instcode_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($dom,$instcode,$owner) = split(/:/, $tail);
+     $instcode = &unescape($instcode);
+     $owner = &unescape($owner);
+     my ($outcome,$description,$credits) =
+         &localenroll::validate_instcode($dom,$instcode,$owner);
+     my $result = &escape($outcome).'&'.&escape($description).'&'.
+                  &escape($credits);
+     &Reply($client, \$result, $userinput);
+     return 1;
+ }
+ &register_handler("autovalidateinstcode", \&validate_instcode_handler, 0, 1, 0);
+ #   Get the official sections for which auto-enrollment is possible.
+ #   Since the admin people won't know about 'unofficial sections'
+ #   we cannot auto-enroll on them.
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched here.
+ #    $tail    - The remainder of the request.  In our case this
+ #               will be split into:
+ #               $coursecode   - The course name from the admin point of view.
+ #               $cdom         - The course's domain(?).
+ #    $client  - Socket open on the client.
+ # Returns:
+ #    1    - Indiciting processing should continue.
+ #
+ sub get_sections_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($coursecode, $cdom) = split(/:/, $tail);
+     my @secs = &localenroll::get_sections($coursecode,$cdom);
+     my $seclist = &escape(join(':',@secs));
+     &Reply($client, \$seclist, $userinput);
+     return 1;
+ }
+ &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
+ #   Validate the owner of a new course section.
+ #
+ # Formal Parameters:
+ #   $cmd      - Command that got us dispatched.
+ #   $tail     - the remainder of the command.  For us this consists of a
+ #               colon separated string containing:
+ #                  $inst    - Course Id from the institutions point of view.
+ #                  $owner   - Proposed owner of the course.
+ #                  $cdom    - Domain of the course (from the institutions
+ #                             point of view?)..
+ #   $client   - Socket open on the client.
+ #
+ # Returns:
+ #   1        - Processing should continue.
+ #
+ sub validate_course_owner_handler {
+     my ($cmd, $tail, $client)  = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_course_id, $owner, $cdom, $coowners) = split(/:/, $tail);
+     $owner = &unescape($owner);
+     $coowners = &unescape($coowners);
+     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom,$coowners);
+     &Reply($client, \$outcome, $userinput);
+     return 1;
+ }
+ &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
+ #
+ #   Validate a course section in the official schedule of classes
+ #   from the institutions point of view (part of autoenrollment).
+ #
+ # Formal Parameters:
+ #   $cmd          - The command request that got us dispatched.
+ #   $tail         - The tail of the command.  In this case,
+ #                   this is a colon separated set of words that will be split
+ #                   into:
+ #                        $inst_course_id - The course/section id from the
+ #                                          institutions point of view.
+ #                        $cdom           - The domain from the institutions
+ #                                          point of view.
+ #   $client       - Socket open on the client.
+ # Returns:
+ #    1           - Indicating processing should continue.
+ #
+ sub validate_course_section_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_course_id, $cdom) = split(/:/, $tail);
+     my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
+     &Reply($client, \$outcome, $userinput);
+     return 1;
+ }
+ &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
+ #
+ #   Validate course owner's access to enrollment data for specific class section.
+ #
+ #
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - The tail of the command.   In this case this is a colon separated
+ #               set of words that will be split into:
+ #               $inst_class  - Institutional code for the specific class section
+ #               $courseowner - The escaped username:domain of the course owner
+ #               $cdom        - The domain of the course from the institution's
+ #                              point of view.
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ #
+ sub validate_class_access_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($inst_class,$ownerlist,$cdom) = split(/:/, $tail);
+     my $owners = &unescape($ownerlist);
+     my $outcome;
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$outcome=&localenroll::check_section($inst_class,$owners,$cdom);
+     };
+     &Reply($client,\$outcome, $userinput);
+     return 1;
+ }
+ &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
+ #
+ #   Create a password for a new LON-CAPA user added by auto-enrollment.
+ #   Only used for case where authentication method for new user is localauth
+ #
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - The tail of the command.   In this case this is a colon separated
+ #               set of words that will be split into:
+ #               $authparam - An authentication parameter (localauth parameter).
+ #               $cdom      - The domain of the course from the institution's
+ #                            point of view.
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ #
+ sub create_auto_enroll_password_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($authparam, $cdom) = split(/:/, $userinput);
+     my ($create_passwd,$authchk);
+     ($authparam,
+      $create_passwd,
+      $authchk) = &localenroll::create_password($authparam,$cdom);
+     &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
+ 	   $userinput);
+     return 1;
+ }
+ &register_handler("autocreatepassword", \&create_auto_enroll_password_handler,
+, 1, 0);
+ sub auto_export_grades_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$info,$data) = split(/:/,$tail);
+     my $inforef = &Apache::lonnet::thaw_unescape($info);
+     my $dataref = &Apache::lonnet::thaw_unescape($data);
+     my ($outcome,$result);;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         my %rtnhash;
+         $outcome=&localenroll::export_grades($cdom,$cnum,$inforef,$dataref,\%rtnhash);
+         if ($outcome eq 'ok') {
+             foreach my $key (keys(%rtnhash)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rtnhash{$key}).'&';
+             }
+             $result =~ s/\&$//;
+         }
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             if ($cipher) {
+                 my $cmdlength=length($result);
+                 $result.="         ";
+                 my $encresult='';
+                 for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+                     $encresult.= unpack("H16",
+                                         $cipher->encrypt(substr($result,
+                                                                 $encidx,
+)));
+                 }
+                 &Reply( $client, "enc:$cmdlength:$encresult\n", $userinput);
+             } else {
+                 &Failure( $client, "error:no_key\n", $userinput);
+             }
+         } else {
+             &Reply($client, "$outcome\n", $userinput);
+         }
+     } else {
+         &Failure($client,"export_error\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autoexportgrades", \&auto_export_grades_handler,
+, 1, 0);
+ #   Retrieve and remove temporary files created by/during autoenrollment.
+ #
+ # Formal Parameters:
+ #    $cmd      - The command that got us dispatched.
+ #    $tail     - The tail of the command.  In our case this is a colon
+ #                separated list that will be split into:
+ #                $filename - The name of the file to retrieve.
+ #                            The filename is given as a path relative to
+ #                            the LonCAPA temp file directory.
+ #    $client   - Socket open on the client.
+ #
+ # Returns:
+ #   1     - Continue processing.
+ sub retrieve_auto_file_handler {
+     my ($cmd, $tail, $client)    = @_;
+     my $userinput                = "cmd:$tail";
+     my ($filename)   = split(/:/, $tail);
+     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
+     if ($filename =~m{/\.\./}) {
+         &Failure($client, "refused\n", $userinput);
+     } elsif ($filename !~ /^$LONCAPA::match_domain\_$LONCAPA::match_courseid\_.+_classlist\.xml$/) {
+         &Failure($client, "refused\n", $userinput);
+     } elsif ( (-e $source) && ($filename ne '') ) {
+ 	my $reply = '';
+ 	if (open(my $fh,$source)) {
+ 	    while (<$fh>) {
+ 		chomp($_);
+ 		$_ =~ s/^\s+//g;
+ 		$_ =~ s/\s+$//g;
+ 		$reply .= $_;
+ 	    }
+ 	    close($fh);
+ 	    &Reply($client, &escape($reply)."\n", $userinput);
+ #   Does this have to be uncommented??!?  (RF).
+ #
+ #                                unlink($source);
+ 	} else {
+ 	    &Failure($client, "error\n", $userinput);
+ 	}
+     } else {
+ 	&Failure($client, "error\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
+ sub crsreq_checks_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my $dom = $tail;
+     my $result;
+     my @reqtypes = ('official','unofficial','community','textbook','placement');
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         my %validations;
+         my $response = &localenroll::crsreq_checks($dom,\@reqtypes,
+                                                    \%validations);
+         if ($response eq 'ok') {
+             foreach my $key (keys(%validations)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($validations{$key}).'&';
+             }
+             $result =~ s/\&$//;
+         } else {
+             $result = 'error';
+         }
+     };
+     if (!$@) {
+         &Reply($client, \$result, $userinput);
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autocrsreqchecks", \&crsreq_checks_handler, 0, 1, 0);
+ sub validate_crsreq_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($dom,$owner,$crstype,$inststatuslist,$instcode,$instseclist,$customdata) = split(/:/, $tail);
+     $instcode = &unescape($instcode);
+     $owner = &unescape($owner);
+     $crstype = &unescape($crstype);
+     $inststatuslist = &unescape($inststatuslist);
+     $instcode = &unescape($instcode);
+     $instseclist = &unescape($instseclist);
+     my $custominfo = &Apache::lonnet::thaw_unescape($customdata);
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::validate_crsreq($dom,$owner,$crstype,
+                                                  $inststatuslist,$instcode,
+                                                  $instseclist,$custominfo);
+     };
+     if (!$@) {
+         &Reply($client, \$outcome, $userinput);
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autocrsreqvalidation", \&validate_crsreq_handler, 0, 1, 0);
+ sub crsreq_update_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput = "$cmd:$tail";
+     my ($cdom,$cnum,$crstype,$action,$ownername,$ownerdomain,$fullname,$title,$code,
+         $accessstart,$accessend,$infohashref) =
+         split(/:/, $tail);
+     $crstype = &unescape($crstype);
+     $action = &unescape($action);
+     $ownername = &unescape($ownername);
+     $ownerdomain = &unescape($ownerdomain);
+     $fullname = &unescape($fullname);
+     $title = &unescape($title);
+     $code = &unescape($code);
+     $accessstart = &unescape($accessstart);
+     $accessend = &unescape($accessend);
+     my $incoming = &Apache::lonnet::thaw_unescape($infohashref);
+     my ($result,$outcome);
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         my %rtnhash;
+         $outcome = &localenroll::crsreq_updates($cdom,$cnum,$crstype,$action,
+                                                 $ownername,$ownerdomain,$fullname,
+                                                 $title,$code,$accessstart,$accessend,
+                                                 $incoming,\%rtnhash);
+         if ($outcome eq 'ok') {
+             my @posskeys = qw(createdweb createdmsg createdcustomized createdactions queuedweb queuedmsg formitems reviewweb validationjs onload javascript);
+             foreach my $key (keys(%rtnhash)) {
+                 if (grep(/^\Q$key\E/,@posskeys)) {
+                     $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rtnhash{$key}).'&';
+                 }
+             }
+             $result =~ s/\&$//;
+         }
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             &Reply($client, \$result, $userinput);
+         } else {
+             &Reply($client, "format_error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autocrsrequpdate", \&crsreq_update_handler, 0, 1, 0);
+ #
+ #   Read and retrieve institutional code format (for support form).
+ # Formal Parameters:
+ #    $cmd        - Command that dispatched us.
+ #    $tail       - Tail of the command.  In this case it conatins
+ #                  the course domain and the coursename.
+ #    $client     - Socket open on the client.
+ # Returns:
+ #    1     - Continue processing.
+ #
+ sub get_institutional_code_format_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $reply;
+     my($cdom,$course) = split(/:/,$tail);
+     my @pairs = split/\&/,$course;
+     my %instcodes = ();
+     my %codes = ();
+     my @codetitles = ();
+     my %cat_titles = ();
+     my %cat_order = ();
+     foreach (@pairs) {
+ 	my ($key,$value) = split/=/,$_;
+ 	$instcodes{&unescape($key)} = &unescape($value);
+     }
+     my $formatreply = &localenroll::instcode_format($cdom,
+ 						    \%instcodes,
+ 						    \%codes,
+ 						    \@codetitles,
+ 						    \%cat_titles,
+ 						    \%cat_order);
+     if ($formatreply eq 'ok') {
+ 	my $codes_str = &Apache::lonnet::hash2str(%codes);
+ 	my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
+ 	my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
+ 	my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
+ 	&Reply($client,
+ 	       $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
+ 	       .$cat_order_str."\n",
+ 	       $userinput);
+     } else {
+ 	# this else branch added by RF since if not ok, lonc will
+ 	# hang waiting on reply until timeout.
+ 	#
+ 	&Reply($client, "format_error\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("autoinstcodeformat",
+ 		  \&get_institutional_code_format_handler,0,1,0);
+ sub get_institutional_defaults_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = $tail;
+     my %defaults_hash;
+     my @code_order;
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
+                                                    \@code_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             while (my ($key,$value) = each(%defaults_hash)) {
+                 $result.=&escape($key).'='.&escape($value).'&';
+             }
+             $result .= 'code_order='.&escape(join('&',@code_order));
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("autoinstcodedefaults",
+                   \&get_institutional_defaults_handler,0,1,0);
+ sub get_possible_instcodes_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $reply;
+     my $cdom = $tail;
+     my (@codetitles,%cat_titles,%cat_order,@code_order);
+     my $formatreply = &localenroll::possible_instcodes($cdom,
+                                                        \@codetitles,
+                                                        \%cat_titles,
+                                                        \%cat_order,
+                                                        \@code_order);
+     if ($formatreply eq 'ok') {
+         my $result = join('&',map {&escape($_);} (@codetitles)).':';
+         $result .= join('&',map {&escape($_);} (@code_order)).':';
+         foreach my $key (keys(%cat_titles)) {
+             $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($cat_titles{$key}).'&';
+         }
+         $result =~ s/\&$//;
+         $result .= ':';
+         foreach my $key (keys(%cat_order)) {
+             $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($cat_order{$key}).'&';
+         }
+         $result =~ s/\&$//;
+         &Reply($client,\$result,$userinput);
+     } else {
+         &Reply($client, "format_error\n", $userinput);
+     }
+     return 1;
+ }
+ &register_handler("autopossibleinstcodes",
+                   \&get_possible_instcodes_handler,0,1,0);
+ sub get_institutional_user_rules {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = &unescape($tail);
+     my (%rules_hash,@rules_order);
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::username_rules($dom,\%rules_hash,\@rules_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result;
+             foreach my $key (keys(%rules_hash)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
+             }
+             $result =~ s/\&$//;
+             $result .= ':';
+             if (@rules_order > 0) {
+                 foreach my $item (@rules_order) {
+                     $result .= &escape($item).'&';
+                 }
+             }
+             $result =~ s/\&$//;
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instuserrules",\&get_institutional_user_rules,0,1,0);
+ sub get_institutional_id_rules {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = &unescape($tail);
+     my (%rules_hash,@rules_order);
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::id_rules($dom,\%rules_hash,\@rules_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result;
+             foreach my $key (keys(%rules_hash)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
+             }
+             $result =~ s/\&$//;
+             $result .= ':';
+             if (@rules_order > 0) {
+                 foreach my $item (@rules_order) {
+                     $result .= &escape($item).'&';
+                 }
+             }
+             $result =~ s/\&$//;
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instidrules",\&get_institutional_id_rules,0,1,0);
+ sub get_institutional_selfcreate_rules {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $dom = &unescape($tail);
+     my (%rules_hash,@rules_order);
+     my $outcome;
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::selfcreate_rules($dom,\%rules_hash,\@rules_order);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result;
+             foreach my $key (keys(%rules_hash)) {
+                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
+             }
+             $result =~ s/\&$//;
+             $result .= ':';
+             if (@rules_order > 0) {
+                 foreach my $item (@rules_order) {
+                     $result .= &escape($item).'&';
+                 }
+             }
+             $result =~ s/\&$//;
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instemailrules",\&get_institutional_selfcreate_rules,0,1,0);
+ sub institutional_username_check {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my %rulecheck;
+     my $outcome;
+     my ($udom,$uname,@rules) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $uname = &unescape($uname);
+     @rules = map {&unescape($_);} (@rules);
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::username_check($udom,$uname,\@rules,\%rulecheck);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             foreach my $key (keys(%rulecheck)) {
+                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
+             }
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instrulecheck",\&institutional_username_check,0,1,0);
+ sub institutional_id_check {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my %rulecheck;
+     my $outcome;
+     my ($udom,$id,@rules) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $id = &unescape($id);
+     @rules = map {&unescape($_);} (@rules);
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::id_check($udom,$id,\@rules,\%rulecheck);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             foreach my $key (keys(%rulecheck)) {
+                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
+             }
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instidrulecheck",\&institutional_id_check,0,1,0);
+ sub institutional_selfcreate_check {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my %rulecheck;
+     my $outcome;
+     my ($udom,$email,@rules) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $email = &unescape($email);
+     @rules = map {&unescape($_);} (@rules);
+     eval {
+         local($SIG{__DIE__})='DEFAULT';
+         $outcome = &localenroll::selfcreate_check($udom,$email,\@rules,\%rulecheck);
+     };
+     if (!$@) {
+         if ($outcome eq 'ok') {
+             my $result='';
+             foreach my $key (keys(%rulecheck)) {
+                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
+             }
+             &Reply($client,\$result,$userinput);
+         } else {
+             &Reply($client,"error\n", $userinput);
+         }
+     } else {
+         &Failure($client,"unknown_cmd\n",$userinput);
+     }
+ }
+ &register_handler("instselfcreatecheck",\&institutional_selfcreate_check,0,1,0);
+ # Get domain specific conditions for import of student photographs to a course
+ #
+ # Retrieves information from photo_permission subroutine in localenroll.
+ # Returns outcome (ok) if no processing errors, and whether course owner is
+ # required to accept conditions of use (yes/no).
+ #
+ #
+ sub photo_permission_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my $cdom = $tail;
+     my ($perm_reqd,$conditions);
+     my $outcome;
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
+ 						  \$conditions);
+     };
+     if (!$@) {
+ 	&Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
+ 	       $userinput);
+     } else {
+ 	&Failure($client,"unknown_cmd\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
+ #
+ # Checks if student photo is available for a user in the domain, in the user's
+ # directory (in /userfiles/internal/studentphoto.jpg).
+ # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
+ # the student's photo.
+ sub photo_check_handler {
+     my ($cmd, $tail, $client)   = @_;
+     my $userinput               = "$cmd:$tail";
+     my ($udom,$uname,$pid) = split(/:/,$tail);
+     $udom = &unescape($udom);
+     $uname = &unescape($uname);
+     $pid = &unescape($pid);
+     my $path=&propath($udom,$uname).'/userfiles/internal/';
+     if (!-e $path) {
+         &mkpath($path);
+     }
+     my $response;
+     my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
+     $result .= ':'.$response;
+     &Reply($client, &escape($result)."\n",$userinput);
+     return 1;
+ }
+ &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
+ #
+ # Retrieve information from localenroll about whether to provide a button
+ # for users who have enbled import of student photos to initiate an
+ # update of photo files for registered students. Also include
+ # comment to display alongside button.
+ sub photo_choice_handler {
+     my ($cmd, $tail, $client) = @_;
+     my $userinput             = "$cmd:$tail";
+     my $cdom                  = &unescape($tail);
+     my ($update,$comment);
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	($update,$comment)    = &localenroll::manager_photo_update($cdom);
+     };
+     if (!$@) {
+ 	&Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
+     } else {
+ 	&Failure($client,"unknown_cmd\n",$userinput);
+     }
+     return 1;
+ }
+ &register_handler("autophotochoice",\&photo_choice_handler,0,1,0);
+ #
+ # Gets a student's photo to exist (in the correct image type) in the user's
+ # directory.
+ # Formal Parameters:
+ #    $cmd     - The command request that got us dispatched.
+ #    $tail    - A colon separated set of words that will be split into:
+ #               $domain - student's domain
+ #               $uname  - student username
+ #               $type   - image type desired
+ #    $client  - The socket open on the client.
+ # Returns:
+ #    1 - continue processing.
+ sub student_photo_handler {
+     my ($cmd, $tail, $client) = @_;
+     my ($domain,$uname,$ext,$type) = split(/:/, $tail);
+     my $path=&propath($domain,$uname). '/userfiles/internal/';
+     my $filename = 'studentphoto.'.$ext;
+     if ($type eq 'thumbnail') {
+         $filename = 'studentphoto_tn.'.$ext;
+     }
+     if (-e $path.$filename) {
+ 	&Reply($client,"ok\n","$cmd:$tail");
+ 	return 1;
+     }
+     &mkpath($path);
+     my $file;
+     if ($type eq 'thumbnail') {
+ 	eval {
+ 	    local($SIG{__DIE__})='DEFAULT';
+ 	    $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
+ 	};
+     } else {
+         $file=&localstudentphoto::fetch($domain,$uname);
+     }
+     if (!$file) {
+ 	&Failure($client,"unavailable\n","$cmd:$tail");
+ 	return 1;
+     }
+     if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
+     if (-e $path.$filename) {
+ 	&Reply($client,"ok\n","$cmd:$tail");
+ 	return 1;
+     }
+     &Failure($client,"unable_to_convert\n","$cmd:$tail");
+     return 1;
+ }
+ &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
+ sub inst_usertypes_handler {
+     my ($cmd, $domain, $client) = @_;
+     my $res;
+     my $userinput = $cmd.":".$domain; # For logging purposes.
+     my (%typeshash,@order,$result);
+     eval {
+ 	local($SIG{__DIE__})='DEFAULT';
+ 	$result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
+     };
+     if ($result eq 'ok') {
+         if (keys(%typeshash) > 0) {
+             foreach my $key (keys(%typeshash)) {
+                 $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
+             }
+         }
+         $res=~s/\&$//;
+         $res .= ':';
+         if (@order > 0) {
+             foreach my $item (@order) {
+                 $res .= &escape($item).'&';
+             }
+         }
+         $res=~s/\&$//;
+     }
+     &Reply($client, \$res, $userinput);
+     return 1;
+ }
+ &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
+ # mkpath makes all directories for a file, expects an absolute path with a
+ # file or a trailing / if just a dir is passed
+ # returns 1 on success 0 on failure
+ sub mkpath {
+     my ($file)=@_;
+     my @parts=split(/\//,$file,-1);
+     my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
+     for (my $i=3;$i<= ($#parts-1);$i++) {
+ 	$now.='/'.$parts[$i];
+ 	if (!-e $now) {
+ 	    if  (!mkdir($now,0770)) { return 0; }
+ 	}
+     }
+     return 1;
+ }
+ #---------------------------------------------------------------
+ #
+ #   Getting, decoding and dispatching requests:
+ #
+ #
+ #   Get a Request:
+ #   Gets a Request message from the client.  The transaction
+ #   is defined as a 'line' of text.  We remove the new line
+ #   from the text line.
+ #
+ sub get_request {
+     my $input = <$client>;
+     chomp($input);
+     &Debug("get_request: Request = $input\n");
+     &status('Processing '.$clientname.':'.$input);
+     return $input;
+ }
+ #---------------------------------------------------------------
+ #
+ #  Process a request.  This sub should shrink as each action
+ #  gets farmed out into a separat sub that is registered
+ #  with the dispatch hash.
+ #
+ # Parameters:
+ #    user_input   - The request received from the client (lonc).
+ #
+ # Returns:
+ #    true to keep processing, false if caller should exit.
+ #
+ sub process_request {
+     my ($userinput) = @_; # Easier for now to break style than to
+                           # fix all the userinput -> user_input.
+     my $wasenc    = 0;		# True if request was encrypted.
+ # ------------------------------------------------------------ See if encrypted
+     # for command
+     # sethost:<server>
+     # <command>:<args>
+     #   we just send it to the processor
+     # for
+     # sethost:<server>:<command>:<args>
+     #  we do the implict set host and then do the command
+     if ($userinput =~ /^sethost:/) {
+ 	(my $cmd,my $newid,$userinput) = split(':',$userinput,3);
+ 	if (defined($userinput)) {
+ 	    &sethost("$cmd:$newid");
+ 	} else {
+ 	    $userinput = "$cmd:$newid";
+ 	}
+     }
+     if ($userinput =~ /^enc/) {
+ 	$userinput = decipher($userinput);
+ 	$wasenc=1;
+ 	if(!$userinput) {	# Cipher not defined.
+ 	    &Failure($client, "error: Encrypted data without negotated key\n");
+ 	    return 0;
+ 	}
+     }
+     Debug("process_request: $userinput\n");
+     #
+     #   The 'correct way' to add a command to lond is now to
+     #   write a sub to execute it and Add it to the command dispatch
+     #   hash via a call to register_handler..  The comments to that
+     #   sub should give you enough to go on to show how to do this
+     #   along with the examples that are building up as this code
+     #   is getting refactored.   Until all branches of the
+     #   if/elseif monster below have been factored out into
+     #   separate procesor subs, if the dispatch hash is missing
+     #   the command keyword, we will fall through to the remainder
+     #   of the if/else chain below in order to keep this thing in
+     #   working order throughout the transmogrification.
+     my ($command, $tail) = split(/:/, $userinput, 2);
+     chomp($command);
+     chomp($tail);
+     $tail =~ s/(\r)//;		# This helps people debugging with e.g. telnet.
+     $command =~ s/(\r)//;	# And this too for parameterless commands.
+     if(!$tail) {
+ 	$tail ="";		# defined but blank.
+     }
+     &Debug("Command received: $command, encoded = $wasenc");
+     if(defined $Dispatcher{$command}) {
+ 	my $dispatch_info = $Dispatcher{$command};
+ 	my $handler       = $$dispatch_info[0];
+ 	my $need_encode   = $$dispatch_info[1];
+ 	my $client_types  = $$dispatch_info[2];
+ 	Debug("Matched dispatch hash: mustencode: $need_encode "
+ 	      ."ClientType $client_types");
+ 	#  Validate the request:
+ 	my $ok = 1;
+ 	my $requesterprivs = 0;
+ 	if(&isClient()) {
+ 	    $requesterprivs |= $CLIENT_OK;
+ 	}
+ 	if(&isManager()) {
+ 	    $requesterprivs |= $MANAGER_OK;
+ 	}
+ 	if($need_encode && (!$wasenc)) {
+ 	    Debug("Must encode but wasn't: $need_encode $wasenc");
+ 	    $ok = 0;
+ 	}
+ 	if(($client_types & $requesterprivs) == 0) {
+ 	    Debug("Client not privileged to do this operation");
+ 	    $ok = 0;
+ 	}
+         if ($ok) {
+             if (ref($trust{$command}) eq 'HASH') {
+                 my $donechecks;
+                 if ($trust{$command}{'anywhere'}) {
+                    $donechecks = 1;
+                 } elsif ($trust{$command}{'manageronly'}) {
+                     unless (&isManager()) {
+                         $ok = 0;
+                     }
+                     $donechecks = 1;
+                 } elsif ($trust{$command}{'institutiononly'}) {
+                     unless ($clientsameinst) {
+                         $ok = 0;
+                     }
+                     $donechecks = 1;
+                 } elsif ($clientsameinst) {
+                     $donechecks = 1;
+                 }
+                 unless ($donechecks) {
+                     foreach my $rule (keys(%{$trust{$command}})) {
+                         next if ($rule eq 'remote');
+                         if ($trust{$command}{$rule}) {
+                             if ($clientprohibited{$rule}) {
+                                 $ok = 0;
+                             } else {
+                                 $ok = 1;
+                                 $donechecks = 1;
+                                 last;
+                             }
+                         }
+                     }
+                 }
+                 unless ($donechecks) {
+                     if ($trust{$command}{'remote'}) {
+                         if ($clientremoteok) {
+                             $ok = 1;
+                         } else {
+                             $ok = 0;
+                         }
+                     }
+                 }
+             }
+         }
+ 	if($ok) {
+ 	    Debug("Dispatching to handler $command $tail");
+ 	    my $keep_going = &$handler($command, $tail, $client);
+ 	    return $keep_going;
+ 	} else {
+ 	    Debug("Refusing to dispatch because client did not match requirements");
+ 	    Failure($client, "refused\n", $userinput);
+ 	    return 1;
+ 	}
+     }
+     print $client "unknown_cmd\n";
+ # -------------------------------------------------------------------- complete
+     Debug("process_request - returning 1");
+     return 1;
+ }
+ #
+ #   Decipher encoded traffic
+ #  Parameters:
+ #     input      - Encoded data.
+ #  Returns:
+ #     Decoded data or undef if encryption key was not yet negotiated.
+ #  Implicit input:
+ #     cipher  - This global holds the negotiated encryption key.
+ #
+ sub decipher {
+     my ($input)  = @_;
+     my $output = '';
+     if($cipher) {
+ 	my($enc, $enclength, $encinput) = split(/:/, $input);
+ 	for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
+ 	    $output .=
+ 		$cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
+ 	}
+ 	return substr($output, 0, $enclength);
+     } else {
+ 	return undef;
+     }
+ }
+ #
+ #   Register a command processor.  This function is invoked to register a sub
+ #   to process a request.  Once registered, the ProcessRequest sub can automatically
+ #   dispatch requests to an appropriate sub, and do the top level validity checking
+ #   as well:
+ #    - Is the keyword recognized.
+ #    - Is the proper client type attempting the request.
+ #    - Is the request encrypted if it has to be.
+ #   Parameters:
+ #    $request_name         - Name of the request being registered.
+ #                           This is the command request that will match
+ #                           against the hash keywords to lookup the information
+ #                           associated with the dispatch information.
+ #    $procedure           - Reference to a sub to call to process the request.
+ #                           All subs get called as follows:
+ #                             Procedure($cmd, $tail, $replyfd, $key)
+ #                             $cmd    - the actual keyword that invoked us.
+ #                             $tail   - the tail of the request that invoked us.
+ #                             $replyfd- File descriptor connected to the client
+ #    $must_encode          - True if the request must be encoded to be good.
+ #    $client_ok            - True if it's ok for a client to request this.
+ #    $manager_ok           - True if it's ok for a manager to request this.
+ # Side effects:
+ #      - On success, the Dispatcher hash has an entry added for the key $RequestName
+ #      - On failure, the program will die as it's a bad internal bug to try to
+ #        register a duplicate command handler.
+ #
+ sub register_handler {
+     my ($request_name,$procedure,$must_encode,	$client_ok,$manager_ok)   = @_;
+     #  Don't allow duplication#
+     if (defined $Dispatcher{$request_name}) {
+ 	die "Attempting to define a duplicate request handler for $request_name\n";
+     }
+     #   Build the client type mask:
+     my $client_type_mask = 0;
+     if($client_ok) {
+ 	$client_type_mask  |= $CLIENT_OK;
+     }
+     if($manager_ok) {
+ 	$client_type_mask  |= $MANAGER_OK;
+     }
+     #  Enter the hash:
+     my @entry = ($procedure, $must_encode, $client_type_mask);
+     $Dispatcher{$request_name} = \@entry;
+ }
+ #------------------------------------------------------------------
+ #
+ #  Convert an error return code from lcpasswd to a string value.
+ #
+ sub lcpasswdstrerror {
      my $ErrorCode = shift;
-     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
+     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
- 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
+ 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
      } else {
- 	return $adderrors[$ErrorCode];
+ 	return $passwderrors[$ErrorCode];
      }
  }
- Line 931  sub catchexception {
+ Line 6657  sub catchexception {
      $SIG{__DIE__}='DEFAULT';
      &status("Catching exception");
      &logthis("<font color='red'>CRITICAL: "
-      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
+      ."ABNORMAL EXIT. Child $$ for server ".$perlvar{'lonHostID'}." died through "
       ."a crash with this error msg->[$error]</font>");
      &logthis('Famous last words: '.$status.' - '.$lastlog);
      if ($client) { print $client "error: $error\n"; }
      $server->close();
      die($error);
  }
  sub timeout {
      &status("Handling Timeout");
      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
- Line 946  sub timeout {
+ Line 6671  sub timeout {
  }
  # -------------------------------- Set signal handlers to record abnormal exits
  $SIG{'QUIT'}=\&catchexception;
  $SIG{__DIE__}=\&catchexception;
- Line 984  if (-e $pidfile) {
+ Line 6710  if (-e $pidfile) {
  $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                                  Type      => SOCK_STREAM,
                                  Proto     => 'tcp',
-                                 Reuse     => 1,
+                                 ReuseAddr     => 1,
                                  Listen    => 10 )
    or die "making socket: $@\n";
- Line 1042  sub HUPSMAN {                      # sig
+ Line 6768  sub HUPSMAN {                      # sig
  }
  #
- #    Kill off hashes that describe the host table prior to re-reading it.
- #    Hashes affected are:
- #       %hostid, %hostdom %hostip %hostdns.
- #
- sub KillHostHashes {
-     foreach my $key (keys %hostid) {
- 	delete $hostid{$key};
-     }
-     foreach my $key (keys %hostdom) {
- 	delete $hostdom{$key};
-     }
-     foreach my $key (keys %hostip) {
- 	delete $hostip{$key};
-     }
-     foreach my $key (keys %hostdns) {
- 	delete $hostdns{$key};
-     }
- }
- #
- #   Read in the host table from file and distribute it into the various hashes:
- #
- #    - %hostid  -  Indexed by IP, the loncapa hostname.
- #    - %hostdom -  Indexed by  loncapa hostname, the domain.
- #    - %hostip  -  Indexed by hostid, the Ip address of the host.
- sub ReadHostTable {
-     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
-     my $myloncapaname = $perlvar{'lonHostID'};
-     Debug("My loncapa name is : $myloncapaname");
-     while (my $configline=<CONFIG>) {
- 	if (!($configline =~ /^\s*\#/)) {
- 	    my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
- 	    chomp($ip); $ip=~s/\D+$//;
- 	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
- 	    $hostdom{$id}=$domain;    # LonCAPA domain name of host.
- 	    $hostip{$id}=$ip;	      # IP address of host.
- 	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
- 	    if ($id eq $perlvar{'lonHostID'}) {
- 		Debug("Found me in the host table: $name");
- 		$thisserver=$name;
- 	    }
- 	}
-     }
-     close(CONFIG);
- }
- #
  #  Reload the Apache daemon's state.
  #  This is done by invoking /home/httpd/perl/apachereload
  #  a setuid perl script that can be root for us to do this job.
  #
  sub ReloadApache {
-     my $execdir = $perlvar{'lonDaemons'};
+ # --------------------------- Handle case of another apachereload process (locking)
-     my $script  = $execdir."/apachereload";
+     if (&LONCAPA::try_to_lock('/tmp/lock_apachereload')) {
-     system($script);
+         my $execdir = $perlvar{'lonDaemons'};
+         my $script  = $execdir."/apachereload";
+         system($script);
+         unlink('/tmp/lock_apachereload'); #  Remove the lock file.
+     }
  }
  #
- Line 1119  sub UpdateHosts {
+ Line 6802  sub UpdateHosts {
      #  either dropped or changed hosts.  Note that the re-read of the table
      #  will take care of new and changed hosts as connections come into being.
+     &Apache::lonnet::reset_hosts_info();
-     KillHostHashes;
+     foreach my $child (keys(%children)) {
-     ReadHostTable;
-     foreach my $child (keys %children) {
  	my $childip = $children{$child};
- 	if(!$hostid{$childip}) {
+ 	if ($childip ne '127.0.0.1'
+ 	    && !defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
  	    logthis('<font color="blue"> UpdateHosts killing child '
  		    ." $child for ip $childip </font>");
  	    kill('INT', $child);
- Line 1146  sub checkchildren {
+ Line 6828  sub checkchildren {
      &logthis('Going to check on the children');
      my $docdir=$perlvar{'lonDocRoot'};
      foreach (sort keys %children) {
- 	sleep 1;
+ 	#sleep 1;
          unless (kill 'USR1' => $_) {
  	    &logthis ('Child '.$_.' is dead');
              &logstatus($$.' is dead');
+ 	    delete($children{$_});
          }
      }
      sleep 5;
-     $SIG{ALRM} = sub { die "timeout" };
+     $SIG{ALRM} = sub { Debug("timeout");
+ 		       die "timeout";  };
      $SIG{__DIE__} = 'DEFAULT';
      &status("Checking on the children (waiting for reports)");
      foreach (sort keys %children) {
- Line 1167  sub checkchildren {
+ Line 6851  sub checkchildren {
  	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
  	    #$execdir=$perlvar{'lonDaemons'};
  	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
+ 	    delete($children{$_});
  	    alarm(0);
  	  }
          }
- Line 1174  sub checkchildren {
+ Line 6859  sub checkchildren {
      $SIG{ALRM} = 'DEFAULT';
      $SIG{__DIE__} = \&catchexception;
      &status("Finished checking children");
+     &logthis('Finished Checking children');
  }
  # --------------------------------------------------------------------- Logging
- Line 1204  sub Debug {
+ Line 6890  sub Debug {
  #     reply   - Text to send to client.
  #     request - Original request from client.
  #
+ #NOTE $reply must be terminated by exactly *one* \n. If $reply is a reference
+ #this is done automatically ($$reply must not contain any \n in this case).
+ #If $reply is a string the caller has to ensure this.
  sub Reply {
      my ($fd, $reply, $request) = @_;
+     if (ref($reply)) {
+ 	print $fd $$reply;
+ 	print $fd "\n";
+ 	if ($DEBUG) { Debug("Request was $request  Reply was $$reply"); }
+     } else {
+ 	print $fd $reply;
+ 	if ($DEBUG) { Debug("Request was $request  Reply was $reply"); }
+     }
+     $Transactions++;
+ }
-     print $fd $reply;
-     Debug("Request was $request  Reply was $reply");
+ #
+ #    Sub to report a failure.
+ #    This function:
+ #     -   Increments the failure statistic counters.
+ #     -   Invokes Reply to send the error message to the client.
+ # Parameters:
+ #    fd       - File descriptor open on the client
+ #    reply    - Reply text to emit.
+ #    request  - The original request message (used by Reply
+ #               to debug if that's enabled.
+ # Implicit outputs:
+ #    $Failures- The number of failures is incremented.
+ #    Reply (invoked here) sends a message to the
+ #    client:
+ #
+ sub Failure {
+     my $fd      = shift;
+     my $reply   = shift;
+     my $request = shift;
+     $Failures++;
+     Reply($fd, $reply, $request);      # That's simple eh?
  }
  # ------------------------------------------------------------------ Log status
- Line 1218  sub logstatus {
+ Line 6936  sub logstatus {
      &status("Doing logging");
      my $docdir=$perlvar{'lonDocRoot'};
      {
-     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
-     print $fh $$."\t".$clientname."\t".$currenthostid."\t"
- 	.$status."\t".$lastlog."\t $keymode\n";
-     $fh->close();
-     }
-     &status("Finished londstatus.txt");
-     {
  	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
          print $fh $status."\n".$lastlog."\n".time."\n$keymode";
          $fh->close();
      }
+     &status("Finished $$.txt");
+     {
+ 	open(LOG,">>$docdir/lon-status/londstatus.txt");
+ 	flock(LOG,LOCK_EX);
+ 	print LOG $$."\t".$clientname."\t".$currenthostid."\t"
+ 	    .$status."\t".$lastlog."\t $keymode\n";
+ 	flock(LOG,LOCK_UN);
+ 	close(LOG);
+     }
      &status("Finished logging");
  }
  sub initnewstatus {
      my $docdir=$perlvar{'lonDocRoot'};
      my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
-     my $now=time;
+     my $now=time();
      my $local=localtime($now);
      print $fh "LOND status $local - parent $$\n\n";
      opendir(DIR,"$docdir/lon-status/londchld");
- Line 1255  sub status {
+ Line 6975  sub status {
      $0='lond: '.$what.' '.$local;
  }
- # -------------------------------------------------------- Escape Special Chars
- sub escape {
-     my $str=shift;
-     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
-     return $str;
- }
- # ----------------------------------------------------- Un-Escape Special Chars
- sub unescape {
-     my $str=shift;
-     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
-     return $str;
- }
- # ----------------------------------------------------------- Send USR1 to lonc
- sub reconlonc {
-     my $peerfile=shift;
-     &logthis("Trying to reconnect for $peerfile");
-     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
-     if (my $fh=IO::File->new("$loncfile")) {
- 	my $loncpid=<$fh>;
-         chomp($loncpid);
-         if (kill 0 => $loncpid) {
- 	    &logthis("lonc at pid $loncpid responding, sending USR1");
-             kill USR1 => $loncpid;
-         } else {
- 	    &logthis(
-               "<font color='red'>CRITICAL: "
-              ."lonc at pid $loncpid not responding, giving up</font>");
-         }
-     } else {
-       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
-     }
- }
- # -------------------------------------------------- Non-critical communication
- sub subreply {
-     my ($cmd,$server)=@_;
-     my $peerfile="$perlvar{'lonSockDir'}/$server";
-     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
-                                       Type    => SOCK_STREAM,
-                                       Timeout => 10)
-        or return "con_lost";
-     print $sclient "$cmd\n";
-     my $answer=<$sclient>;
-     chomp($answer);
-     if (!$answer) { $answer="con_lost"; }
-     return $answer;
- }
- sub reply {
-   my ($cmd,$server)=@_;
-   my $answer;
-   if ($server ne $currenthostid) {
-     $answer=subreply($cmd,$server);
-     if ($answer eq 'con_lost') {
- 	$answer=subreply("ping",$server);
-         if ($answer ne $server) {
- 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
-            &reconlonc("$perlvar{'lonSockDir'}/$server");
-         }
-         $answer=subreply($cmd,$server);
-     }
-   } else {
-     $answer='self_reply';
-   }
-   return $answer;
- }
  # -------------------------------------------------------------- Talk to lonsql
- sub sqlreply {
+ sub sql_reply {
      my ($cmd)=@_;
-     my $answer=subsqlreply($cmd);
+     my $answer=&sub_sql_reply($cmd);
-     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
+     if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
      return $answer;
  }
- sub subsqlreply {
+ sub sub_sql_reply {
      my ($cmd)=@_;
      my $unixsock="mysqlsock";
      my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
- Line 1345  sub subsqlreply {
+ Line 6992  sub subsqlreply {
                                        Type    => SOCK_STREAM,
                                        Timeout => 10)
         or return "con_lost";
-     print $sclient "$cmd\n";
+     print $sclient "$cmd:$currentdomainid\n";
      my $answer=<$sclient>;
      chomp($answer);
      if (!$answer) { $answer="con_lost"; }
      return $answer;
  }
- # -------------------------------------------- Return path to profile directory
- sub propath {
-     my ($udom,$uname)=@_;
-     $udom=~s/\W//g;
-     $uname=~s/\W//g;
-     my $subdir=$uname.'__';
-     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
-     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
-     return $proname;
- }
  # --------------------------------------- Is this the home server of an author?
  sub ishome {
- Line 1408  $SIG{USR1} = \&checkchildren;
+ Line 7043  $SIG{USR1} = \&checkchildren;
  $SIG{USR2} = \&UpdateHosts;
  #  Read the host hashes:
+ &Apache::lonnet::load_hosts_tab();
+ my %iphost = &Apache::lonnet::get_iphost(1);
+ $dist=`$perlvar{'lonDaemons'}/distprobe`;
- ReadHostTable;
+ my $arch = `uname -i`;
+ chomp($arch);
+ if ($arch eq 'unknown') {
+     $arch = `uname -m`;
+     chomp($arch);
+ }
  # --------------------------------------------------------------
  #   Accept connections.  When a connection comes in, it is validated
- Line 1426  while (1) {
+ Line 7070  while (1) {
  sub make_new_child {
      my $pid;
-     my $cipher;
+ #    my $cipher;     # Now global
      my $sigset;
      $client = shift;
- Line 1457  sub make_new_child {
+ Line 7101  sub make_new_child {
      if (defined($iaddr)) {
  	$clientip  = inet_ntoa($iaddr);
  	Debug("Connected with $clientip");
- 	$clientdns = gethostbyaddr($iaddr, AF_INET);
- 	Debug("Connected with $clientdns by name");
      } else {
  	&logthis("Unable to determine clientip");
  	$clientip='Unavailable';
- Line 1470  sub make_new_child {
+ Line 7112  sub make_new_child {
              or die "Can't unblock SIGINT for fork: $!\n";
          $children{$pid} = $clientip;
          &status('Started child '.$pid);
+ 	close($client);
          return;
      } else {
          # Child can *not* return from this subroutine.
- Line 1478  sub make_new_child {
+ Line 7121  sub make_new_child {
                                  #don't get intercepted
          $SIG{USR1}= \&logstatus;
          $SIG{ALRM}= \&timeout;
+ 	#
+ 	# Block sigpipe as it gets thrownon socket disconnect and we want to
+ 	# deal with that as a read faiure instead.
+ 	#
+ 	my $blockset = POSIX::SigSet->new(SIGPIPE);
+ 	sigprocmask(SIG_BLOCK, $blockset);
          $lastlog='Forked ';
          $status='Forked';
- Line 1485  sub make_new_child {
+ Line 7135  sub make_new_child {
          sigprocmask(SIG_UNBLOCK, $sigset)
              or die "Can't unblock SIGINT for fork: $!\n";
-         my $tmpsnum=0;
+ #        my $tmpsnum=0;            # Now global
  #---------------------------------------------------- kerberos 5 initialization
          &Authen::Krb5::init_context();
-         &Authen::Krb5::init_ets();
+         my $no_ets;
+         if ($dist =~ /^(?:centos|rhes|scientific)(\d+)$/) {
+             if ($1 >= 7) {
+                 $no_ets = 1;
+             }
+         } elsif ($dist =~ /^suse(\d+\.\d+)$/) {
+             if (($1 eq '9.3') || ($1 >= 12.2)) {
+                 $no_ets = 1;
+             }
+         } elsif ($dist =~ /^sles(\d+)$/) {
+             if ($1 > 11) {
+                 $no_ets = 1;
+             }
+         } elsif ($dist =~ /^fedora(\d+)$/) {
+             if ($1 < 7) {
+                 $no_ets = 1;
+             }
+         }
+         unless ($no_ets) {
+ 	    &Authen::Krb5::init_ets();
+ 	}
  	&status('Accepted connection');
  # =============================================================================
- Line 1496  sub make_new_child {
+ Line 7167  sub make_new_child {
  # -----------------------------------------------------------------------------
  	# see if we know client and 'check' for spoof IP by ineffective challenge
- 	ReadManagerTable;	# May also be a manager!!
+ 	my $outsideip=$clientip;
+ 	if ($clientip eq '127.0.0.1') {
- 	my $clientrec=($hostid{$clientip}     ne undef);
+ 	    $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
- 	my $ismanager=($managers{$clientip}    ne undef);
+ 	}
- 	$clientname  = "[unknonwn]";
+ 	&ReadManagerTable();
+ 	my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
+ 	my $ismanager=($managers{$outsideip}    ne undef);
+ 	$clientname  = "[unknown]";
  	if($clientrec) {	# Establish client type.
  	    $ConnectionType = "client";
- 	    $clientname = $hostid{$clientip};
+ 	    $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
  	    if($ismanager) {
  		$ConnectionType = "both";
  	    }
  	} else {
  	    $ConnectionType = "manager";
- 	    $clientname = $managers{$clientip};
+ 	    $clientname = $managers{$outsideip};
  	}
  	my $clientok;
- Line 1522  sub make_new_child {
+ Line 7196  sub make_new_child {
  	    my $remotereq=<$client>;
  	    chomp($remotereq);
  	    Debug("Got init: $remotereq");
- 	    my $inikeyword = split(/:/, $remotereq);
  	    if ($remotereq =~ /^init/) {
  		&sethost("sethost:$perlvar{'lonHostID'}");
  		#
  		#  If the remote is attempting a local init... give that a try:
  		#
- 		my ($i, $inittype) = split(/:/, $remotereq);
+ 		(my $i, my $inittype, $clientversion) = split(/:/, $remotereq);
+         # For LON-CAPA 2.9, the  client session will have sent its LON-CAPA
+         # version when initiating the connection. For LON-CAPA 2.8 and older,
+         # the version is retrieved from the global %loncaparevs in lonnet.pm.
+         # $clientversion contains path to keyfile if $inittype eq 'local'
+         # it's overridden below in this case
+         $clientversion ||= $Apache::lonnet::loncaparevs{$clientname};
  		# If the connection type is ssl, but I didn't get my
  		# certificate files yet, then I'll drop  back to
- Line 1543  sub make_new_child {
+ Line 7223  sub make_new_child {
  			$inittype = ""; # This forces insecure attempt.
  			&logthis("<font color=\"blue\"> Certificates not "
  				 ."installed -- trying insecure auth</font>");
- 		    }
+ 		    } else {	# SSL certificates are in place so
- 		    else {	# SSL certificates are in place so
  		    }		# Leave the inittype alone.
  		}
  		if($inittype eq "local") {
+                     $clientversion = $perlvar{'lonVersion'};
  		    my $key = LocalConnection($client, $remotereq);
  		    if($key) {
  			Debug("Got local key $key");
- Line 1556  sub make_new_child {
+ Line 7236  sub make_new_child {
  			my $cipherkey = pack("H32", $key);
  			$cipher       = new IDEA($cipherkey);
  			print $client "ok:local\n";
- 			&logthis('<font color="green"'
+ 			&logthis('<font color="green">'
  				 . "Successful local authentication </font>");
  			$keymode = "local"
  		    } else {
- Line 1611  sub make_new_child {
+ Line 7291  sub make_new_child {
  	if ($clientok) {
  # ---------------- New known client connecting, could mean machine online again
+ 	    if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip
- 	    foreach my $id (keys(%hostip)) {
+ 		&& $clientip ne '127.0.0.1') {
- 		if ($hostip{$id} ne $clientip ||
+ 		&Apache::lonnet::reconlonc($clientname);
- 		    $hostip{$currenthostid} eq $clientip) {
- 		    # no need to try to do recon's to myself
- 		    next;
- 		}
- 		&reconlonc("$perlvar{'lonSockDir'}/$id");
  	    }
  	    &logthis("<font color='green'>Established connection: $clientname</font>");
  	    &status('Will listen to '.$clientname);
  # ------------------------------------------------------------ Process requests
- 	    while (my $userinput=<$client>) {
+ 	    my $keep_going = 1;
-                 chomp($userinput);
+ 	    my $user_input;
- 		Debug("Request = $userinput\n");
+             my $clienthost = &Apache::lonnet::hostname($clientname);
-                 &status('Processing '.$clientname.': '.$userinput);
+             my $clientserverhomeID = &Apache::lonnet::get_server_homeID($clienthost);
-                 my $wasenc=0;
+             $clienthomedom = &Apache::lonnet::host_domain($clientserverhomeID);
-                 alarm(120);
+             $clientintdom = &Apache::lonnet::internet_dom($clientserverhomeID);
- # ------------------------------------------------------------ See if encrypted
+             $clientsameinst = 0;
- 		if ($userinput =~ /^enc/) {
+             if ($clientintdom ne '') {
- 		    if ($cipher) {
+                 my $internet_names = &Apache::lonnet::get_internet_names($currenthostid);
- 			my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
+                 if (ref($internet_names) eq 'ARRAY') {
- 			$userinput='';
+                     if (grep(/^\Q$clientintdom\E$/,@{$internet_names})) {
- 			for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
+                         $clientsameinst = 1;
- 			    $userinput.=
+                     }
- 				$cipher->decrypt(
+                 }
- 						 pack("H16",substr($encinput,$encidx,16))
- 						 );
- 			}
- 			$userinput=substr($userinput,0,$cmdlength);
- 			$wasenc=1;
- 		    }
- 		}
- # ------------------------------------------------------------- Normal commands
- # ------------------------------------------------------------------------ ping
- 		if ($userinput =~ /^ping/) {	# client only
- 		    if(isClient) {
- 			print $client "$currenthostid\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ pong
- 		}elsif ($userinput =~ /^pong/) { # client only
- 		    if(isClient) {
- 			my $reply=&reply("ping",$clientname);
- 			print $client "$currenthostid:$reply\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ ekey
- 		} elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
- 		    my $buildkey=time.$$.int(rand 100000);
- 		    $buildkey=~tr/1-6/A-F/;
- 		    $buildkey=int(rand 100000).$buildkey.int(rand 100000);
- 		    my $key=$currenthostid.$clientname;
- 		    $key=~tr/a-z/A-Z/;
- 		    $key=~tr/G-P/0-9/;
- 		    $key=~tr/Q-Z/0-9/;
- 		    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
- 		    $key=substr($key,0,32);
- 		    my $cipherkey=pack("H32",$key);
- 		    $cipher=new IDEA $cipherkey;
- 		    print $client "$buildkey\n";
- # ------------------------------------------------------------------------ load
- 		} elsif ($userinput =~ /^load/) { # client only
- 		    if (isClient) {
- 			my $loadavg;
- 			{
- 			    my $loadfile=IO::File->new('/proc/loadavg');
- 			    $loadavg=<$loadfile>;
- 			}
- 			$loadavg =~ s/\s.*//g;
- 			my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
- 			print $client "$loadpercent\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- userload
- 		} elsif ($userinput =~ /^userload/) { # client only
- 		    if(isClient) {
- 			my $userloadpercent=&userload();
- 			print $client "$userloadpercent\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- #
- #        Transactions requiring encryption:
- #
- # ----------------------------------------------------------------- currentauth
- 		} elsif ($userinput =~ /^currentauth/) {
- 		    if (($wasenc==1)  && isClient) { # Encoded & client only.
- 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
- 			my $result = GetAuthType($udom, $uname);
- 			if($result eq "nouser") {
- 			    print $client "unknown_user\n";
- 			}
- 			else {
- 			    print $client "$result\n"
- 			    }
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- #--------------------------------------------------------------------- pushfile
- 		} elsif($userinput =~ /^pushfile/) {	# encoded & manager.
- 		    if(($wasenc == 1) && isManager) {
- 			my $cert = GetCertificate($userinput);
- 			if(ValidManager($cert)) {
- 			    my $reply = PushFile($userinput);
- 			    print $client "$reply\n";
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- #--------------------------------------------------------------------- reinit
- 		} elsif($userinput =~ /^reinit/) { # Encoded and manager
- 			if (($wasenc == 1) && isManager) {
- 				my $cert = GetCertificate($userinput);
- 				if(ValidManager($cert)) {
- 					chomp($userinput);
- 					my $reply = ReinitProcess($userinput);
- 					print $client  "$reply\n";
- 				} else {
- 					 print $client "refused\n";
- 				}
- 			} else {
- 				Reply($client, "refused\n", $userinput);
- 			}
- #------------------------------------------------------------------------- edit
- 		    } elsif ($userinput =~ /^edit/) {    # encoded and manager:
- 			if(($wasenc ==1) && (isManager)) {
- 			    my $cert = GetCertificate($userinput);
- 			    if(ValidManager($cert)) {
-                my($command, $filetype, $script) = split(/:/, $userinput);
-                if (($filetype eq "hosts") || ($filetype eq "domain")) {
-                   if($script ne "") {
- 		      Reply($client, EditFile($userinput));
-                   } else {
-                      Reply($client,"refused\n",$userinput);
-                   }
-                } else {
-                   Reply($client,"refused\n",$userinput);
-                }
-             } else {
-                Reply($client,"refused\n",$userinput);
              }
-          } else {
+             $clientremoteok = 0;
- 	     Reply($client,"refused\n",$userinput);
+             unless ($clientsameinst) {
- 	 }
+                 $clientremoteok = 1;
- # ------------------------------------------------------------------------ auth
+                 my $defdom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
- 		    } elsif ($userinput =~ /^auth/) { # Encoded and client only.
+                 %clientprohibited = &get_prohibited($defdom);
- 		    if (($wasenc==1) && isClient) {
+                 if ($clientintdom) {
- 			my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
+                     my $remsessconf = &get_usersession_config($defdom,'remotesession');
- 			chomp($upass);
+                     if (ref($remsessconf) eq 'HASH') {
- 			$upass=unescape($upass);
+                         if (ref($remsessconf->{'remote'}) eq 'HASH') {
- 			my $proname=propath($udom,$uname);
+                             if (ref($remsessconf->{'remote'}->{'excludedomain'}) eq 'ARRAY') {
- 			my $passfilename="$proname/passwd";
+                                 if (grep(/^\Q$clientintdom\E$/,@{$remsessconf->{'remote'}->{'excludedomain'}})) {
- 			if (-e $passfilename) {
+                                     $clientremoteok = 0;
- 			    my $pf = IO::File->new($passfilename);
- 			    my $realpasswd=<$pf>;
- 			    chomp($realpasswd);
- 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
- 			    my $pwdcorrect=0;
- 			    if ($howpwd eq 'internal') {
- 				&Debug("Internal auth");
- 				$pwdcorrect=
- 				    (crypt($upass,$contentpwd) eq $contentpwd);
- 			    } elsif ($howpwd eq 'unix') {
- 				&Debug("Unix auth");
- 				if((getpwnam($uname))[1] eq "") { #no such user!
- 				    $pwdcorrect = 0;
- 				} else {
- 				    $contentpwd=(getpwnam($uname))[1];
- 				    my $pwauth_path="/usr/local/sbin/pwauth";
- 				    unless ($contentpwd eq 'x') {
- 					$pwdcorrect=
- 					    (crypt($upass,$contentpwd) eq
- 					     $contentpwd);
- 				    }
- 				    elsif (-e $pwauth_path) {
- 					open PWAUTH, "|$pwauth_path" or
- 					    die "Cannot invoke authentication";
- 					print PWAUTH "$uname\n$upass\n";
- 					close PWAUTH;
- 					$pwdcorrect=!$?;
- 				    }
- 				}
- 			    } elsif ($howpwd eq 'krb4') {
- 				my $null=pack("C",0);
- 				unless ($upass=~/$null/) {
- 				    my $krb4_error = &Authen::Krb4::get_pw_in_tkt
- 					($uname,"",$contentpwd,'krbtgt',
- 					 $contentpwd,1,$upass);
- 				    if (!$krb4_error) {
- 					$pwdcorrect = 1;
- 				    } else {
- 					$pwdcorrect=0;
- 					# log error if it is not a bad password
- 					if ($krb4_error != 62) {
- 					    &logthis('krb4:'.$uname.','.
- 						     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
- 					}
- 				    }
- 				}
- 			    } elsif ($howpwd eq 'krb5') {
- 				my $null=pack("C",0);
- 				unless ($upass=~/$null/) {
- 				    my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
- 				    my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
- 				    my $krbserver=&Authen::Krb5::parse_name($krbservice);
- 				    my $credentials=&Authen::Krb5::cc_default();
- 				    $credentials->initialize($krbclient);
- 				    my $krbreturn =
- 					&Authen::Krb5::get_in_tkt_with_password(
- 										$krbclient,$krbserver,$upass,$credentials);
- #				  unless ($krbreturn) {
- #				      &logthis("Krb5 Error: ".
- #					       &Authen::Krb5::error());
- #				  }
- 				    $pwdcorrect = ($krbreturn == 1);
- 				} else { $pwdcorrect=0; }
- 			    } elsif ($howpwd eq 'localauth') {
- 				$pwdcorrect=&localauth::localauth($uname,$upass,
- 								  $contentpwd);
- 			    }
- 			    if ($pwdcorrect) {
- 				print $client "authorized\n";
- 			    } else {
- 				print $client "non_authorized\n";
- 			    }
- 			} else {
- 			    print $client "unknown_user\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- passwd
- 		} elsif ($userinput =~ /^passwd/) { # encoded and client
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
- 			chomp($npass);
- 			$upass=&unescape($upass);
- 			$npass=&unescape($npass);
- 			&Debug("Trying to change password for $uname");
- 			my $proname=propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			if (-e $passfilename) {
- 			    my $realpasswd;
- 			    { my $pf = IO::File->new($passfilename);
- 			      $realpasswd=<$pf>; }
- 			    chomp($realpasswd);
- 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
- 			    if ($howpwd eq 'internal') {
- 				&Debug("internal auth");
- 				if (crypt($upass,$contentpwd) eq $contentpwd) {
- 				    my $salt=time;
- 				    $salt=substr($salt,6,2);
- 				    my $ncpass=crypt($npass,$salt);
- 				    {
- 					my $pf;
- 					if ($pf = IO::File->new(">$passfilename")) {
- 					    print $pf "internal:$ncpass\n";
- 					    &logthis("Result of password change for $uname: pwchange_success");
- 					    print $client "ok\n";
- 					} else {
- 					    &logthis("Unable to open $uname passwd to change password");
- 					    print $client "non_authorized\n";
- 					}
- 				    }
- 				} else {
- 				    print $client "non_authorized\n";
- 				}
- 			    } elsif ($howpwd eq 'unix') {
- 				# Unix means we have to access /etc/password
- 				# one way or another.
- 				# First: Make sure the current password is
- 				#        correct
- 				&Debug("auth is unix");
- 				$contentpwd=(getpwnam($uname))[1];
- 				my $pwdcorrect = "0";
- 				my $pwauth_path="/usr/local/sbin/pwauth";
- 				unless ($contentpwd eq 'x') {
- 				    $pwdcorrect=
- 					(crypt($upass,$contentpwd) eq $contentpwd);
- 				} elsif (-e $pwauth_path) {
- 				    open PWAUTH, "|$pwauth_path" or
- 					die "Cannot invoke authentication";
- 				    print PWAUTH "$uname\n$upass\n";
- 				    close PWAUTH;
- 				    &Debug("exited pwauth with $? ($uname,$upass) ");
- 				    $pwdcorrect=($? == 0);
- 				}
- 				if ($pwdcorrect) {
- 				    my $execdir=$perlvar{'lonDaemons'};
- 				    &Debug("Opening lcpasswd pipeline");
- 				    my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
- 				    print $pf "$uname\n$npass\n$npass\n";
- 				    close $pf;
- 				    my $err = $?;
- 				    my $result = ($err>0 ? 'pwchange_failure'
- 						  : 'ok');
- 				    &logthis("Result of password change for $uname: ".
- 					     &lcpasswdstrerror($?));
- 				    print $client "$result\n";
- 				} else {
- 				    print $client "non_authorized\n";
- 				}
- 			    } else {
- 				print $client "auth_mode_error\n";
- 			    }
- 			} else {
- 			    print $client "unknown_user\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- makeuser
- 		} elsif ($userinput =~ /^makeuser/) { # encoded and client.
- 		    &Debug("Make user received");
- 		    my $oldumask=umask(0077);
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
- 			&Debug("cmd =".$cmd." $udom =".$udom.
- 			       " uname=".$uname);
- 			chomp($npass);
- 			$npass=&unescape($npass);
- 			my $proname=propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			&Debug("Password file created will be:".
- 			       $passfilename);
- 			if (-e $passfilename) {
- 			    print $client "already_exists\n";
- 			} elsif ($udom ne $currentdomainid) {
- 			    print $client "not_right_domain\n";
- 			} else {
- 			    my @fpparts=split(/\//,$proname);
- 			    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
- 			    my $fperror='';
- 			    for (my $i=3;$i<=$#fpparts;$i++) {
- 				$fpnow.='/'.$fpparts[$i];
- 				unless (-e $fpnow) {
- 				    unless (mkdir($fpnow,0777)) {
- 					$fperror="error: ".($!+0)
- 					    ." mkdir failed while attempting "
- 					    ."makeuser";
- 				    }
- 				}
- 			    }
- 			    unless ($fperror) {
- 				my $result=&make_passwd_file($uname, $umode,$npass,
- 							     $passfilename);
- 				print $client $result;
- 			    } else {
- 				print $client "$fperror\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- 		    umask($oldumask);
- # -------------------------------------------------------------- changeuserauth
- 		} elsif ($userinput =~ /^changeuserauth/) { # encoded & client
- 		    &Debug("Changing authorization");
- 		    if (($wasenc==1) && isClient) {
- 			my
- 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
- 			chomp($npass);
- 			&Debug("cmd = ".$cmd." domain= ".$udom.
- 			       "uname =".$uname." umode= ".$umode);
- 			$npass=&unescape($npass);
- 			my $proname=&propath($udom,$uname);
- 			my $passfilename="$proname/passwd";
- 			if ($udom ne $currentdomainid) {
- 			    print $client "not_right_domain\n";
- 			} else {
- 			    my $result=&make_passwd_file($uname, $umode,$npass,
- 							 $passfilename);
- 			    print $client $result;
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ home
- 		} elsif ($userinput =~ /^home/) { # client clear or encoded
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
- 			chomp($uname);
- 			my $proname=propath($udom,$uname);
- 			if (-e $proname) {
- 			    print $client "found\n";
- 			} else {
- 			    print $client "not_found\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- update
- 		} elsif ($userinput =~ /^update/) { # client clear or encoded.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my $ownership=ishome($fname);
- 			if ($ownership eq 'not_owner') {
- 			    if (-e $fname) {
- 				my ($dev,$ino,$mode,$nlink,
- 				    $uid,$gid,$rdev,$size,
- 				    $atime,$mtime,$ctime,
- 				    $blksize,$blocks)=stat($fname);
- 				my $now=time;
- 				my $since=$now-$atime;
- 				if ($since>$perlvar{'lonExpire'}) {
- 				    my $reply=
- 					&reply("unsub:$fname","$clientname");
- 				    unlink("$fname");
- 				} else {
- 				    my $transname="$fname.in.transfer";
- 				    my $remoteurl=
- 					&reply("sub:$fname","$clientname");
- 				    my $response;
- 				    {
- 					my $ua=new LWP::UserAgent;
- 					my $request=new HTTP::Request('GET',"$remoteurl");
- 					$response=$ua->request($request,$transname);
- 				    }
- 				    if ($response->is_error()) {
- 					unlink($transname);
- 					my $message=$response->status_line;
- 					&logthis(
- 						 "LWP GET: $message for $fname ($remoteurl)");
- 				    } else {
- 					if ($remoteurl!~/\.meta$/) {
- 					    my $ua=new LWP::UserAgent;
- 					    my $mrequest=
- 						new HTTP::Request('GET',$remoteurl.'.meta');
- 					    my $mresponse=
- 						$ua->request($mrequest,$fname.'.meta');
- 					    if ($mresponse->is_error()) {
- 						unlink($fname.'.meta');
- 					    }
- 					}
- 					rename($transname,$fname);
- 				    }
- 				}
- 				print $client "ok\n";
- 			    } else {
- 				print $client "not_found\n";
- 			    }
- 			} else {
- 			    print $client "rejected\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------- fetch a user file from a remote server
- 		} elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
- 			my $udir=propath($udom,$uname).'/userfiles';
- 			unless (-e $udir) { mkdir($udir,0770); }
- 			if (-e $udir) {
-                             $ufile=~s/^[\.\~]+//;
-                             my $path = $udir;
-                             if ($ufile =~m|(.+)/([^/]+)$|) {
-                                 my @parts=split('/',$1);
-                                 foreach my $part (@parts) {
-                                     $path .= '/'.$part;
-                                     if ((-e $path)!=1) {
-                                         mkdir($path,0770);
-                                     }
                                  }
                              }
- 			    my $destname=$udir.'/'.$ufile;
+                             if (ref($remsessconf->{'remote'}->{'includedomain'}) eq 'ARRAY') {
- 			    my $transname=$udir.'/'.$ufile.'.in.transit';
+                                 if (grep(/^\Q$clientintdom\E$/,@{$remsessconf->{'remote'}->{'includedomain'}})) {
- 			    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
+                                     $clientremoteok = 1;
- 			    my $response;
+                                 } else {
- 			    {
+                                     $clientremoteok = 0;
- 				my $ua=new LWP::UserAgent;
- 				my $request=new HTTP::Request('GET',"$remoteurl");
- 				$response=$ua->request($request,$transname);
- 			    }
- 			    if ($response->is_error()) {
- 				unlink($transname);
- 				my $message=$response->status_line;
- 				&logthis("LWP GET: $message for $fname ($remoteurl)");
- 				print $client "failed\n";
- 			    } else {
- 				if (!rename($transname,$destname)) {
- 				    &logthis("Unable to move $transname to $destname");
- 				    unlink($transname);
- 				    print $client "failed\n";
- 				} else {
- 				    print $client "ok\n";
- 				}
- 			    }
- 			} else {
- 			    print $client "not_home\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # --------------------------------------------------------- remove a user file
- 		} elsif ($userinput =~ /^removeuserfile/) { # Client clear or enc.
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
- 			&logthis("$udom - $uname - $ufile");
- 			if ($ufile =~m|/\.\./|) {
- 			    # any files paths with /../ in them refuse
-                             # to deal with
- 			    print $client "refused\n";
- 			} else {
- 			    my $udir=propath($udom,$uname);
- 			    if (-e $udir) {
- 				my $file=$udir.'/userfiles/'.$ufile;
- 				if (-e $file) {
- 				    unlink($file);
- 				    if (-e $file) {
- 					print $client "failed\n";
- 				    } else {
- 					print $client "ok\n";
- 				    }
- 				} else {
- 				    print $client "not_found\n";
- 				}
- 			    } else {
- 				print $client "not_home\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------ authenticate access to a user file
- 		} elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
- 		    if(isClient) {
- 			my ($cmd,$fname,$session)=split(/:/,$userinput);
- 			chomp($session);
- 			my $reply='non_auth';
- 			if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
- 				 $session.'.id')) {
- 			    while (my $line=<ENVIN>) {
- 				if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
- 			    }
- 			    close(ENVIN);
- 			    print $client $reply."\n";
- 			} else {
- 			    print $client "invalid_token\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- unsubscribe
- 		} elsif ($userinput =~ /^unsub/) {
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			if (-e $fname) {
- 			    print $client &unsub($fname,$clientip);
- 			} else {
- 			    print $client "not_found\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------- subscribe
- 		} elsif ($userinput =~ /^sub/) {
- 		    if(isClient) {
- 			print $client &subscribe($userinput,$clientip);
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------- current version
- 		} elsif ($userinput =~ /^currentversion/) {
- 		    if(isClient) {
- 			my ($cmd,$fname)=split(/:/,$userinput);
- 			print $client &currentversion($fname)."\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- log
- 		} elsif ($userinput =~ /^log/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			my $proname=propath($udom,$uname);
- 			my $now=time;
- 			{
- 			    my $hfh;
- 			    if ($hfh=IO::File->new(">>$proname/activity.log")) {
- 				print $hfh "$now:$clientname:$what\n";
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." IO::File->new Failed "
- 				    ."while attempting log\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- put
- 		} elsif ($userinput =~ /^put/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if ($namespace ne 'roles') {
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    unless ($namespace=~/^nohist\_/) {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) { print $hfh "P:$now:$what\n"; }
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',
- 				    "$proname/$namespace.db",
- 				    &GDBM_WRCREAT(),0640)) {
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
- 				    $hash{$key}=$value;
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) failed ".
- 					"while attempting put\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting put\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------- inc
- 		} elsif ($userinput =~ /^inc:/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if ($namespace ne 'roles') {
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    unless ($namespace=~/^nohist\_/) {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) { print $hfh "P:$now:$what\n"; }
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',
- 				    "$proname/$namespace.db",
- 				    &GDBM_WRCREAT(),0640)) {
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
-                                     # We could check that we have a number...
-                                     if (! defined($value) || $value eq '') {
-                                         $value = 1;
-                                     }
- 				    $hash{$key}+=$value;
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) failed ".
- 					"while attempting inc\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting inc\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- rolesput
- 		} elsif ($userinput =~ /^rolesput/) {
- 		    if(isClient) {
- 			&Debug("rolesput");
- 			if ($wasenc==1) {
- 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
- 				=split(/:/,$userinput);
- 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
- 				   "user = ".$exeuser." udom=".$udom.
- 				   "what = ".$what);
- 			    my $namespace='roles';
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) {
- 				    print $hfh "P:$now:$exedom:$exeuser:$what\n";
- 				}
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
- 				    &ManagePermissions($key, $udom, $uname,
- 						       &GetAuthType( $udom,
- 								     $uname));
- 				    $hash{$key}=$value;
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) Failed ".
- 					"while attempting rolesput\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting rolesput\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- rolesdel
- 		} elsif ($userinput =~ /^rolesdel/) {
- 		    if(isClient) {
- 			&Debug("rolesdel");
- 			if ($wasenc==1) {
- 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
- 				=split(/:/,$userinput);
- 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
- 				   "user = ".$exeuser." udom=".$udom.
- 				   "what = ".$what);
- 			    my $namespace='roles';
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) {
- 				    print $hfh "D:$now:$exedom:$exeuser:$what\n";
- 				}
- 			    }
- 			    my @rolekeys=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 				foreach my $key (@rolekeys) {
- 				    delete $hash{$key};
- 				}
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) Failed ".
- 					"while attempting rolesdel\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting rolesdel\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- get
- 		} elsif ($userinput =~ /^get/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($what);
- 			my @queries=split(/\&/,$what);
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    for (my $i=0;$i<=$#queries;$i++) {
- 				$qresult.="$hash{$queries[$i]}&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting get\n";
- 			    }
- 			} else {
- 			    if ($!+0 == 2) {
- 				print $client "error:No such file or ".
- 				    "GDBM reported bad block error\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting get\n";
- 			    }
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ eget
- 		} elsif ($userinput =~ /^eget/) {
- 		    if (isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($what);
- 			my @queries=split(/\&/,$what);
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    for (my $i=0;$i<=$#queries;$i++) {
- 				$qresult.="$hash{$queries[$i]}&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				if ($cipher) {
- 				    my $cmdlength=length($qresult);
- 				    $qresult.="         ";
- 				    my $encqresult='';
- 				    for
- 					(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
- 					    $encqresult.=
- 						unpack("H16",
- 						       $cipher->encrypt(substr($qresult,$encidx,8)));
- 					}
- 				    print $client "enc:$cmdlength:$encqresult\n";
- 				} else {
- 				    print $client "error:no_key\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting eget\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting eget\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------- del
- 		} elsif ($userinput =~ /^del/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($what);
- 			my $proname=propath($udom,$uname);
- 			my $now=time;
- 			unless ($namespace=~/^nohist\_/) {
- 			    my $hfh;
- 			    if (
- 				$hfh=IO::File->new(">>$proname/$namespace.hist")
- 				) { print $hfh "D:$now:$what\n"; }
- 			}
- 			my @keys=split(/\&/,$what);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 			    foreach my $key (@keys) {
- 				delete($hash{$key});
- 			    }
- 			    if (untie(%hash)) {
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting del\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting del\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ keys
- 		} elsif ($userinput =~ /^keys/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    foreach my $key (keys %hash) {
- 				$qresult.="$key&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting keys\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting keys\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- dumpcurrent
- 		} elsif ($userinput =~ /^currentdump/) {
- 		    if (isClient) {
- 			my ($cmd,$udom,$uname,$namespace)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			my $qresult='';
- 			my $proname=propath($udom,$uname);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',
- 				"$proname/$namespace.db",
- 				&GDBM_READER(),0640)) {
- 			    # Structure of %data:
- 			    # $data{$symb}->{$parameter}=$value;
- 			    # $data{$symb}->{'v.'.$parameter}=$version;
- 			    # since $parameter will be unescaped, we do not
- 			    # have to worry about silly parameter names...
- 			    my %data = ();
- 			    while (my ($key,$value) = each(%hash)) {
- 				my ($v,$symb,$param) = split(/:/,$key);
- 				next if ($v eq 'version' || $symb eq 'keys');
- 				next if (exists($data{$symb}) &&
- 					 exists($data{$symb}->{$param}) &&
- 					 $data{$symb}->{'v.'.$param} > $v);
- 				$data{$symb}->{$param}=$value;
- 				$data{$symb}->{'v.'.$param}=$v;
- 			    }
- 			    if (untie(%hash)) {
- 				while (my ($symb,$param_hash) = each(%data)) {
- 				    while(my ($param,$value) = each (%$param_hash)){
- 					next if ($param =~ /^v\./);
- 					$qresult.=$symb.':'.$param.'='.$value.'&';
- 				    }
- 				}
- 				chop($qresult);
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting currentdump\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting currentdump\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------------ dump
- 		} elsif ($userinput =~ /^dump/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$regexp)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if (defined($regexp)) {
- 			    $regexp=&unescape($regexp);
- 			} else {
- 			    $regexp='.';
- 			}
- 			my $qresult='';
- 			my $proname=propath($udom,$uname);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			       while (my ($key,$value) = each(%hash)) {
- 				   if ($regexp eq '.') {
- 				       $qresult.=$key.'='.$value.'&';
- 				   } else {
- 				       my $unescapeKey = &unescape($key);
- 				       if (eval('$unescapeKey=~/$regexp/')) {
- 					   $qresult.="$key=$value&";
- 				       }
- 				   }
- 			       }
- 			       if (untie(%hash)) {
- 				   chop($qresult);
- 				   print $client "$qresult\n";
- 			       } else {
- 				   print $client "error: ".($!+0)
- 				       ." untie(GDBM) Failed ".
-                                        "while attempting dump\n";
- 			       }
- 			   } else {
- 			       print $client "error: ".($!+0)
- 				   ." tie(GDBM) Failed ".
- 				   "while attempting dump\n";
- 			   }
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------------- store
- 		} elsif ($userinput =~ /^store/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$rid,$what)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			if ($namespace ne 'roles') {
- 			    chomp($what);
- 			    my $proname=propath($udom,$uname);
- 			    my $now=time;
- 			    unless ($namespace=~/^nohist\_/) {
- 				my $hfh;
- 				if (
- 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
- 				    ) { print $hfh "P:$now:$rid:$what\n"; }
- 			    }
- 			    my @pairs=split(/\&/,$what);
- 			    my %hash;
- 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
- 				my @previouskeys=split(/&/,$hash{"keys:$rid"});
- 				my $key;
- 				$hash{"version:$rid"}++;
- 				my $version=$hash{"version:$rid"};
- 				my $allkeys='';
- 				foreach my $pair (@pairs) {
- 				    my ($key,$value)=split(/=/,$pair);
- 				    $allkeys.=$key.':';
- 				    $hash{"$version:$rid:$key"}=$value;
- 				}
- 				$hash{"$version:$rid:timestamp"}=$now;
- 				$allkeys.='timestamp';
- 				$hash{"$version:keys:$rid"}=$allkeys;
- 				if (untie(%hash)) {
- 				    print $client "ok\n";
- 				} else {
- 				    print $client "error: ".($!+0)
- 					." untie(GDBM) Failed ".
- 					"while attempting store\n";
- 				}
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." tie(GDBM) Failed ".
- 				    "while attempting store\n";
- 			    }
- 			} else {
- 			    print $client "refused\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # --------------------------------------------------------------------- restore
- 		} elsif ($userinput =~ /^restore/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$uname,$namespace,$rid)
- 			    =split(/:/,$userinput);
- 			$namespace=~s/\//\_/g;
- 			$namespace=~s/\W//g;
- 			chomp($rid);
- 			my $proname=propath($udom,$uname);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
- 			    my $version=$hash{"version:$rid"};
- 			    $qresult.="version=$version&";
- 			    my $scope;
- 			    for ($scope=1;$scope<=$version;$scope++) {
- 				my $vkeys=$hash{"$scope:keys:$rid"};
- 				my @keys=split(/:/,$vkeys);
- 				my $key;
- 				$qresult.="$scope:keys=$vkeys&";
- 				foreach $key (@keys) {
- 				    $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
- 				}
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting restore\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting restore\n";
- 			}
- 		    } else  {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- chatsend
- 		} elsif ($userinput =~ /^chatsend/) {
- 		    if(isClient) {
- 			my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
- 			&chatadd($cdom,$cnum,$newpost);
- 			print $client "ok\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------- chatretr
- 		} elsif ($userinput =~ /^chatretr/) {
- 		    if(isClient) {
- 			my
- 			    ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
- 			my $reply='';
- 			foreach (&getchat($cdom,$cnum,$udom,$uname)) {
- 			    $reply.=&escape($_).':';
- 			}
- 			$reply=~s/\:$//;
- 			print $client $reply."\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------- querysend
- 		} elsif ($userinput =~ /^querysend/) {
- 		    if (isClient) {
- 			my ($cmd,$query,
- 			    $arg1,$arg2,$arg3)=split(/\:/,$userinput);
- 			$query=~s/\n*$//g;
- 			print $client "".
- 			    sqlreply("$clientname\&$query".
- 				     "\&$arg1"."\&$arg2"."\&$arg3")."\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------ queryreply
- 		} elsif ($userinput =~ /^queryreply/) {
- 		    if(isClient) {
- 			my ($cmd,$id,$reply)=split(/:/,$userinput);
- 			my $store;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if ($store=IO::File->new(">$execdir/tmp/$id")) {
- 			    $reply=~s/\&/\n/g;
- 			    print $store $reply;
- 			    close $store;
- 			    my $store2=IO::File->new(">$execdir/tmp/$id.end");
- 			    print $store2 "done\n";
- 			    close $store2;
- 			    print $client "ok\n";
- 			}
- 			else {
- 			    print $client "error: ".($!+0)
- 				." IO::File->new Failed ".
- 				"while attempting queryreply\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- courseidput
- 		} elsif ($userinput =~ /^courseidput/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			$udom=~s/\W//g;
- 			my $proname=
- 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
- 			my $now=time;
- 			my @pairs=split(/\&/,$what);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
- 			    foreach my $pair (@pairs) {
- 				my ($key,$value)=split(/=/,$pair);
- 				$hash{$key}=$value.':'.$now;
- 			    }
- 			    if (untie(%hash)) {
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting courseidput\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting courseidput\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------- courseiddump
- 		} elsif ($userinput =~ /^courseiddump/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$since,$description)
- 			    =split(/:/,$userinput);
- 			if (defined($description)) {
- 			    $description=&unescape($description);
- 			} else {
- 			    $description='.';
- 			}
- 			unless (defined($since)) { $since=0; }
- 			my $qresult='';
- 			my $proname=
- 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
- 			    while (my ($key,$value) = each(%hash)) {
- 				my ($descr,$lasttime)=split(/\:/,$value);
- 				if ($lasttime<$since) { next; }
- 				if ($description eq '.') {
- 				    $qresult.=$key.'='.$descr.'&';
- 				} else {
- 				    my $unescapeVal = &unescape($descr);
- 				    if (eval('$unescapeVal=~/\Q$description\E/i')) {
- 					$qresult.="$key=$descr&";
- 				    }
- 				}
- 			    }
- 			    if (untie(%hash)) {
- 				chop($qresult);
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting courseiddump\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting courseiddump\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------------- idput
- 		} elsif ($userinput =~ /^idput/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			$udom=~s/\W//g;
- 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
- 			my $now=time;
- 			{
- 			    my $hfh;
- 			    if (
- 				$hfh=IO::File->new(">>$proname.hist")
- 				) { print $hfh "P:$now:$what\n"; }
- 			}
- 			my @pairs=split(/\&/,$what);
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
- 			    foreach my $pair (@pairs) {
- 				my ($key,$value)=split(/=/,$pair);
- 				$hash{$key}=$value;
- 			    }
- 			    if (untie(%hash)) {
- 				print $client "ok\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting idput\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting idput\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------------- idget
- 		} elsif ($userinput =~ /^idget/) {
- 		    if(isClient) {
- 			my ($cmd,$udom,$what)=split(/:/,$userinput);
- 			chomp($what);
- 			$udom=~s/\W//g;
- 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
- 			my @queries=split(/\&/,$what);
- 			my $qresult='';
- 			my %hash;
- 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
- 			    for (my $i=0;$i<=$#queries;$i++) {
- 				$qresult.="$hash{$queries[$i]}&";
- 			    }
- 			    if (untie(%hash)) {
- 				$qresult=~s/\&$//;
- 				print $client "$qresult\n";
- 			    } else {
- 				print $client "error: ".($!+0)
- 				    ." untie(GDBM) Failed ".
- 				    "while attempting idget\n";
- 			    }
- 			} else {
- 			    print $client "error: ".($!+0)
- 				." tie(GDBM) Failed ".
- 				"while attempting idget\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- tmpput
- 		} elsif ($userinput =~ /^tmpput/) {
- 		    if(isClient) {
- 			my ($cmd,$what)=split(/:/,$userinput);
- 			my $store;
- 			$tmpsnum++;
- 			my $id=$$.'_'.$clientip.'_'.$tmpsnum;
- 			$id=~s/\W/\_/g;
- 			$what=~s/\n//g;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
- 			    print $store $what;
- 			    close $store;
- 			    print $client "$id\n";
- 			}
- 			else {
- 			    print $client "error: ".($!+0)
- 				."IO::File->new Failed ".
- 				"while attempting tmpput\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- tmpget
- 		} elsif ($userinput =~ /^tmpget/) {
- 		    if(isClient) {
- 			my ($cmd,$id)=split(/:/,$userinput);
- 			chomp($id);
- 			$id=~s/\W/\_/g;
- 			my $store;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
- 			    my $reply=<$store>;
- 			    print $client "$reply\n";
- 			    close $store;
- 			}
- 			else {
- 			    print $client "error: ".($!+0)
- 				."IO::File->new Failed ".
- 				"while attempting tmpget\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ---------------------------------------------------------------------- tmpdel
- 		} elsif ($userinput =~ /^tmpdel/) {
- 		    if(isClient) {
- 			my ($cmd,$id)=split(/:/,$userinput);
- 			chomp($id);
- 			$id=~s/\W/\_/g;
- 			my $execdir=$perlvar{'lonDaemons'};
- 			if (unlink("$execdir/tmp/$id.tmp")) {
- 			    print $client "ok\n";
- 			} else {
- 			    print $client "error: ".($!+0)
- 				."Unlink tmp Failed ".
- 				"while attempting tmpdel\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # -------------------------------------------------------------------------- ls
- 		} elsif ($userinput =~ /^ls/) {
- 		    if(isClient) {
- 			my $obs;
- 			my $rights;
- 			my ($cmd,$ulsdir)=split(/:/,$userinput);
- 			my $ulsout='';
- 			my $ulsfn;
- 			if (-e $ulsdir) {
- 			    if(-d $ulsdir) {
- 				if (opendir(LSDIR,$ulsdir)) {
- 				    while ($ulsfn=readdir(LSDIR)) {
- 					undef $obs, $rights;
- 					my @ulsstats=stat($ulsdir.'/'.$ulsfn);
- 					#We do some obsolete checking here
- 					if(-e $ulsdir.'/'.$ulsfn.".meta") {
- 					    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
- 					    my @obsolete=<FILE>;
- 					    foreach my $obsolete (@obsolete) {
- 					        if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
- 						if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
- 					    }
- 					}
- 					$ulsout.=$ulsfn.'&'.join('&',@ulsstats);
- 					if($obs eq '1') { $ulsout.="&1"; }
- 					else { $ulsout.="&0"; }
- 					if($rights eq '1') { $ulsout.="&1:"; }
- 					else { $ulsout.="&0:"; }
- 				    }
- 				    closedir(LSDIR);
- 				}
- 			    } else {
- 				my @ulsstats=stat($ulsdir);
- 				$ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
- 			    }
- 			} else {
- 			    $ulsout='no_such_dir';
- 			}
- 			if ($ulsout eq '') { $ulsout='empty'; }
- 			print $client "$ulsout\n";
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ----------------------------------------------------------------- setannounce
- 		} elsif ($userinput =~ /^setannounce/) {
- 		    if (isClient) {
- 			my ($cmd,$announcement)=split(/:/,$userinput);
- 			chomp($announcement);
- 			$announcement=&unescape($announcement);
- 			if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
- 						    '/announcement.txt')) {
- 			    print $store $announcement;
- 			    close $store;
- 			    print $client "ok\n";
- 			} else {
- 			    print $client "error: ".($!+0)."\n";
- 			}
- 		    } else {
- 			Reply($client, "refused\n", $userinput);
- 		    }
- # ------------------------------------------------------------------ Hanging up
- 		} elsif (($userinput =~ /^exit/) ||
- 			 ($userinput =~ /^init/)) { # no restrictions.
- 		    &logthis(
- 			     "Client $clientip ($clientname) hanging up: $userinput");
- 		    print $client "bye\n";
- 		    $client->shutdown(2);        # shutdown the socket forcibly.
- 		    $client->close();
- 		    last;
- # ---------------------------------- set current host/domain
- 		} elsif ($userinput =~ /^sethost:/) {
- 		    if (isClient) {
- 			print $client &sethost($userinput)."\n";
- 		    } else {
- 			print $client "refused\n";
- 		    }
- #---------------------------------- request file (?) version.
- 		} elsif ($userinput =~/^version:/) {
- 		    if (isClient) {
- 			print $client &version($userinput)."\n";
- 		    } else {
- 			print $client "refused\n";
- 		    }
- #------------------------------- is auto-enrollment enabled?
-                 } elsif ($userinput =~/^autorun:/) {
-                     if (isClient) {
-                         my ($cmd,$cdom) = split(/:/,$userinput);
-                         my $outcome = &localenroll::run($cdom);
-                         print $client "$outcome\n";
-                     } else {
-                         print $client "0\n";
-                     }
- #------------------------------- get official sections (for auto-enrollment).
-                 } elsif ($userinput =~/^autogetsections:/) {
-                     if (isClient) {
-                         my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
-                         my @secs = &localenroll::get_sections($coursecode,$cdom);
-                         my $seclist = &escape(join(':',@secs));
-                         print $client "$seclist\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #----------------------- validate owner of new course section (for auto-enrollment).
-                 } elsif ($userinput =~/^autonewcourse:/) {
-                     if (isClient) {
-                         my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
-                         my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
-                         print $client "$outcome\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #-------------- validate course section in schedule of classes (for auto-enrollment).
-                 } elsif ($userinput =~/^autovalidatecourse:/) {
-                     if (isClient) {
-                         my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
-                         my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
-                         print $client "$outcome\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #--------------------------- create password for new user (for auto-enrollment).
-                 } elsif ($userinput =~/^autocreatepassword:/) {
-                     if (isClient) {
-                         my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
-                         my ($create_passwd,$authchk);
-                         ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
-                         print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
-                     } else {
-                         print $client "refused\n";
-                     }
- #---------------------------  read and remove temporary files (for auto-enrollment).
-                 } elsif ($userinput =~/^autoretrieve:/) {
-                     if (isClient) {
-                         my ($cmd,$filename) = split(/:/,$userinput);
-                         my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
-                         if ( (-e $source) && ($filename ne '') ) {
-                             my $reply = '';
-                             if (open(my $fh,$source)) {
-                                 while (<$fh>) {
-                                     chomp($_);
-                                     $_ =~ s/^\s+//g;
-                                     $_ =~ s/\s+$//g;
-                                     $reply .= $_;
                                  }
-                                 close($fh);
-                                 print $client &escape($reply)."\n";
- #                                unlink($source);
-                             } else {
-                                 print $client "error\n";
                              }
-                         } else {
-                             print $client "error\n";
                          }
-                     } else {
-                         print $client "refused\n";
                      }
- # ------------------------------------------------------------- unknown command
+                 }
+             }
- 		} else {
+ 	    while(($user_input = get_request) && $keep_going) {
- 		    # unknown command
+ 		alarm(120);
- 		    print $client "unknown_cmd\n";
+ 		Debug("Main: Got $user_input\n");
- 		}
+ 		$keep_going = &process_request($user_input);
- # -------------------------------------------------------------------- complete
  		alarm(0);
  		&status('Listening to '.$clientname." ($keymode)");
  	    }
  # --------------------------------------------- client unknown or fishy, refuse
- 	} else {
+ 	}  else {
  	    print $client "refused\n";
  	    $client->close();
  	    &logthis("<font color='blue'>WARNING: "
  		     ."Rejected client $clientip, closing connection</font>");
  	}
      }
  # =============================================================================
- Line 3223  sub make_new_child {
+ Line 7367  sub make_new_child {
      exit;
  }
+ #
+ #   Determine if a user is an author for the indicated domain.
+ #
+ # Parameters:
+ #    domain          - domain to check in .
+ #    user            - Name of user to check.
+ #
+ # Return:
+ #     1             - User is an author for domain.
+ #     0             - User is not an author for domain.
+ sub is_author {
+     my ($domain, $user) = @_;
+     &Debug("is_author: $user @ $domain");
+     my $hashref = &tie_user_hash($domain, $user, "roles",
+ 				 &GDBM_READER());
+     #  Author role should show up as a key /domain/_au
+     my $value;
+     if ($hashref) {
+ 	my $key    = "/$domain/_au";
+ 	if (defined($hashref)) {
+ 	    $value = $hashref->{$key};
+ 	    if(!untie_user_hash($hashref)) {
+ 		return 'error: ' .  ($!+0)." untie (GDBM) Failed";
+ 	    }
+ 	}
+ 	if(defined($value)) {
+ 	    &Debug("$user @ $domain is an author");
+ 	}
+     } else {
+ 	return 'error: '.($!+0)." tie (GDBM) Failed";
+     }
+     return defined($value);
+ }
  #
  #   Checks to see if the input roleput request was to set
- # an author role.  If so, invokes the lchtmldir script to set
+ # an author role.  If so, creates construction space
- # up a correct public_html
  # Parameters:
  #    request   - The request sent to the rolesput subchunk.
  #                We're looking for  /domain/_au
- Line 3236  sub make_new_child {
+ Line 7417  sub make_new_child {
  #    user      - Name of the user for which the role is being put.
  #    authtype  - The authentication type associated with the user.
  #
- sub ManagePermissions
+ sub manage_permissions {
- {
      my ($request, $domain, $user, $authtype) = @_;
      # See if the request is of the form /$domain/_au
-     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
+     if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
- 	my $execdir = $perlvar{'lonDaemons'};
+         my $path=$perlvar{'lonDocRoot'}."/priv/$domain";
- 	my $userhome= "/home/$user" ;
+         unless (-e $path) {
- 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
+            mkdir($path);
- 	system("$execdir/lchtmldir $userhome $user $authtype");
+         }
+         unless (-e $path.'/'.$user) {
+            mkdir($path.'/'.$user);
+         }
      }
  }
+ #
+ #  Return the full path of a user password file, whether it exists or not.
+ # Parameters:
+ #   domain     - Domain in which the password file lives.
+ #   user       - name of the user.
+ # Returns:
+ #    Full passwd path:
  #
- #   GetAuthType - Determines the authorization type of a user in a domain.
+ sub password_path {
+     my ($domain, $user) = @_;
+     return &propath($domain, $user).'/passwd';
+ }
+ #   Password Filename
+ #   Returns the path to a passwd file given domain and user... only if
+ #  it exists.
+ # Parameters:
+ #   domain    - Domain in which to search.
+ #   user      - username.
+ # Returns:
+ #   - If the password file exists returns its path.
+ #   - If the password file does not exist, returns undefined.
+ #
+ sub password_filename {
+     my ($domain, $user) = @_;
+     Debug ("PasswordFilename called: dom = $domain user = $user");
+     my $path  = &password_path($domain, $user);
+     Debug("PasswordFilename got path: $path");
+     if(-e $path) {
+ 	return $path;
+     } else {
+ 	return undef;
+     }
+ }
+ #
+ #   Rewrite the contents of the user's passwd file.
+ #  Parameters:
+ #    domain    - domain of the user.
+ #    name      - User's name.
+ #    contents  - New contents of the file.
+ # Returns:
+ #   0    - Failed.
+ #   1    - Success.
+ #
+ sub rewrite_password_file {
+     my ($domain, $user, $contents) = @_;
+     my $file = &password_filename($domain, $user);
+     if (defined $file) {
+ 	my $pf = IO::File->new(">$file");
+ 	if($pf) {
+ 	    print $pf "$contents\n";
+ 	    return 1;
+ 	} else {
+ 	    return 0;
+ 	}
+     } else {
+ 	return 0;
+     }
+ }
- #     Returns the authorization type or nouser if there is no such user.
  #
- sub GetAuthType
+ #   get_auth_type - Determines the authorization type of a user in a domain.
- {
+ #     Returns the authorization type or nouser if there is no such user.
+ #
+ sub get_auth_type {
      my ($domain, $user)  = @_;
-     Debug("GetAuthType( $domain, $user ) \n");
+     Debug("get_auth_type( $domain, $user ) \n");
      my $proname    = &propath($domain, $user);
      my $passwdfile = "$proname/passwd";
      if( -e $passwdfile ) {
- Line 3269  sub GetAuthType
+ Line 7515  sub GetAuthType
  	Debug("Password info = $realpassword\n");
  	my ($authtype, $contentpwd) = split(/:/, $realpassword);
  	Debug("Authtype = $authtype, content = $contentpwd\n");
- 	my $availinfo = '';
+ 	return "$authtype:$contentpwd";
- 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
+     } else {
- 	    $availinfo = $contentpwd;
+ 	Debug("Returning nouser");
+ 	return "nouser";
+     }
+ }
+ #
+ #  Validate a user given their domain, name and password.  This utility
+ #  function is used by both  AuthenticateHandler and ChangePasswordHandler
+ #  to validate the login credentials of a user.
+ # Parameters:
+ #    $domain    - The domain being logged into (this is required due to
+ #                 the capability for multihomed systems.
+ #    $user      - The name of the user being validated.
+ #    $password  - The user's propoposed password.
+ #
+ # Returns:
+ #     1        - The domain,user,pasword triplet corresponds to a valid
+ #                user.
+ #     0        - The domain,user,password triplet is not a valid user.
+ #
+ sub validate_user {
+     my ($domain, $user, $password, $checkdefauth) = @_;
+     # Why negative ~pi you may well ask?  Well this function is about
+     # authentication, and therefore very important to get right.
+     # I've initialized the flag that determines whether or not I've
+     # validated correctly to a value it's not supposed to get.
+     # At the end of this function. I'll ensure that it's not still that
+     # value so we don't just wind up returning some accidental value
+     # as a result of executing an unforseen code path that
+     # did not set $validated.  At the end of valid execution paths,
+     # validated shoule be 1 for success or 0 for failuer.
+     my $validated = -3.14159;
+     #  How we authenticate is determined by the type of authentication
+     #  the user has been assigned.  If the authentication type is
+     #  "nouser", the user does not exist so we will return 0.
+     my $contents = &get_auth_type($domain, $user);
+     my ($howpwd, $contentpwd) = split(/:/, $contents);
+     my $null = pack("C",0);	# Used by kerberos auth types.
+     if ($howpwd eq 'nouser') {
+         if ($checkdefauth) {
+             my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
+             if ($domdefaults{'auth_def'} eq 'localauth') {
+                 $howpwd = $domdefaults{'auth_def'};
+                 $contentpwd = $domdefaults{'auth_arg_def'};
+             } elsif ((($domdefaults{'auth_def'} eq 'krb4') ||
+                       ($domdefaults{'auth_def'} eq 'krb5')) &&
+                      ($domdefaults{'auth_arg_def'} ne '')) {
+                 $howpwd = $domdefaults{'auth_def'};
+                 $contentpwd = $domdefaults{'auth_arg_def'};
+             }
+         }
+     }
+     if ($howpwd ne 'nouser') {
+ 	if($howpwd eq "internal") { # Encrypted is in local password file.
+             if (length($contentpwd) == 13) {
+                 $validated = (crypt($password,$contentpwd) eq $contentpwd);
+                 if ($validated) {
+                     my $ncpass = &hash_passwd($domain,$password);
+                     if (&rewrite_password_file($domain,$user,"$howpwd:$ncpass")) {
+                         &update_passwd_history($user,$domain,$howpwd,'conversion');
+                         &logthis("Validated password hashed with bcrypt for $user:$domain");
+                     }
+                 }
+             } else {
+                 $validated = &check_internal_passwd($password,$contentpwd,$domain);
+             }
  	}
+ 	elsif ($howpwd eq "unix") { # User is a normal unix user.
+ 	    $contentpwd = (getpwnam($user))[1];
+ 	    if($contentpwd) {
+ 		if($contentpwd eq 'x') { # Shadow password file...
+ 		    my $pwauth_path = "/usr/local/sbin/pwauth";
+ 		    open PWAUTH,  "|$pwauth_path" or
+ 			die "Cannot invoke authentication";
+ 		    print PWAUTH "$user\n$password\n";
+ 		    close PWAUTH;
+ 		    $validated = ! $?;
+ 		} else { 	         # Passwords in /etc/passwd.
+ 		    $validated = (crypt($password,
+ 					$contentpwd) eq $contentpwd);
+ 		}
+ 	    } else {
+ 		$validated = 0;
+ 	    }
+ 	} elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
+             my $checkwithkrb5 = 0;
+             if ($dist =~/^fedora(\d+)$/) {
+                 if ($1 > 11) {
+                     $checkwithkrb5 = 1;
+                 }
+             } elsif ($dist =~ /^suse([\d.]+)$/) {
+                 if ($1 > 11.1) {
+                     $checkwithkrb5 = 1;
+                 }
+             }
+             if ($checkwithkrb5) {
+                 $validated = &krb5_authen($password,$null,$user,$contentpwd);
+             } else {
+                 $validated = &krb4_authen($password,$null,$user,$contentpwd);
+             }
+ 	} elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
+             $validated = &krb5_authen($password,$null,$user,$contentpwd);
+ 	} elsif ($howpwd eq "localauth") {
+ 	    #  Authenticate via installation specific authentcation method:
+ 	    $validated = &localauth::localauth($user,
+ 					       $password,
+ 					       $contentpwd,
+ 					       $domain);
+ 	    if ($validated < 0) {
+ 		&logthis("localauth for $contentpwd $user:$domain returned a $validated");
+ 		$validated = 0;
+ 	    }
+ 	} else {			# Unrecognized auth is also bad.
+ 	    $validated = 0;
+ 	}
+     } else {
+ 	$validated = 0;
+     }
+     #
+     #  $validated has the correct stat of the authentication:
+     #
- 	return "$authtype:$availinfo";
+     unless ($validated != -3.14159) {
+ 	#  I >really really< want to know if this happens.
+ 	#  since it indicates that user authentication is badly
+ 	#  broken in some code path.
+         #
+ 	die "ValidateUser - failed to set the value of validated $domain, $user $password";
+     }
+     return $validated;
+ }
+ sub check_internal_passwd {
+     my ($plainpass,$stored,$domain) = @_;
+     my (undef,$method,@rest) = split(/!/,$stored);
+     if ($method eq "bcrypt") {
+         my $result = &hash_passwd($domain,$plainpass,@rest);
+         if ($result ne $stored) {
+             return 0;
+         }
+         # Upgrade to a larger number of rounds if necessary
+         my $defaultcost;
+         my %domconfig =
+             &Apache::lonnet::get_dom('configuration',['password'],$domain);
+         if (ref($domconfig{'password'}) eq 'HASH') {
+             $defaultcost = $domconfig{'password'}{'cost'};
+         }
+         if (($defaultcost eq '') || ($defaultcost =~ /D/)) {
+             $defaultcost = 10;
+         }
+         return 1 unless($rest[0]<$defaultcost);
      }
-     else {
+     return 0;
- 	Debug("Returning nouser");
+ }
- 	return "nouser";
+ sub get_last_authchg {
+     my ($domain,$user) = @_;
+     my $lastmod;
+     my $logname = &propath($domain,$user).'/passwd.log';
+     if (-e "$logname") {
+         $lastmod = (stat("$logname"))[9];
+     }
+     return $lastmod;
+ }
+ sub krb4_authen {
+     my ($password,$null,$user,$contentpwd) = @_;
+     my $validated = 0;
+     if (!($password =~ /$null/) ) {  # Null password not allowed.
+         eval {
+             require Authen::Krb4;
+         };
+         if (!$@) {
+             my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
+                                                        "",
+                                                        $contentpwd,,
+                                                        'krbtgt',
+                                                        $contentpwd,
+,
+                                                        $password);
+             if(!$k4error) {
+                 $validated = 1;
+             } else {
+                 $validated = 0;
+                 &logthis('krb4: '.$user.', '.$contentpwd.', '.
+                           &Authen::Krb4::get_err_txt($Authen::Krb4::error));
+             }
+         } else {
+             $validated = krb5_authen($password,$null,$user,$contentpwd);
+         }
      }
+     return $validated;
+ }
+ sub krb5_authen {
+     my ($password,$null,$user,$contentpwd) = @_;
+     my $validated = 0;
+     if(!($password =~ /$null/)) { # Null password not allowed.
+         my $krbclient = &Authen::Krb5::parse_name($user.'@'
+                                                   .$contentpwd);
+         my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
+         my $krbserver  = &Authen::Krb5::parse_name($krbservice);
+         my $credentials= &Authen::Krb5::cc_default();
+         $credentials->initialize(&Authen::Krb5::parse_name($user.'@'
+                                                             .$contentpwd));
+         my $krbreturn;
+         if (exists(&Authen::Krb5::get_init_creds_password)) {
+             $krbreturn =
+                 &Authen::Krb5::get_init_creds_password($krbclient,$password,
+                                                           $krbservice);
+             $validated = (ref($krbreturn) eq 'Authen::Krb5::Creds');
+         } else {
+             $krbreturn  =
+                 &Authen::Krb5::get_in_tkt_with_password($krbclient,$krbserver,
+                                                          $password,$credentials);
+             $validated = ($krbreturn == 1);
+         }
+         if (!$validated) {
+             &logthis('krb5: '.$user.', '.$contentpwd.', '.
+                      &Authen::Krb5::error());
+         }
+     }
+     return $validated;
  }
  sub addline {
      my ($fname,$hostid,$ip,$newline)=@_;
      my $contents;
      my $found=0;
-     my $expr='^'.$hostid.':'.$ip.':';
+     my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
-     $expr =~ s/\./\\\./g;
      my $sh;
      if ($sh=IO::File->new("$fname.subscription")) {
  	while (my $subline=<$sh>) {
- Line 3302  sub addline {
+ Line 7768  sub addline {
      return $found;
  }
- sub getchat {
+ sub get_chat {
-     my ($cdom,$cname,$udom,$uname)=@_;
+     my ($cdom,$cname,$udom,$uname,$group)=@_;
-     my %hash;
-     my $proname=&propath($cdom,$cname);
      my @entries=();
-     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
+     my $namespace = 'nohist_chatroom';
- 	    &GDBM_READER(),0640)) {
+     my $namespace_inroom = 'nohist_inchatroom';
- 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
+     if ($group ne '') {
- 	untie %hash;
+         $namespace .= '_'.$group;
+         $namespace_inroom .= '_'.$group;
+     }
+     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
+ 				 &GDBM_READER());
+     if ($hashref) {
+ 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
+ 	&untie_user_hash($hashref);
      }
      my @participants=();
      my $cutoff=time-60;
-     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
+     $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
- 	    &GDBM_WRCREAT(),0640)) {
+ 			      &GDBM_WRCREAT());
-         $hash{$uname.':'.$udom}=time;
+     if ($hashref) {
-         foreach (sort keys %hash) {
+         $hashref->{$uname.':'.$udom}=time;
- 	    if ($hash{$_}>$cutoff) {
+         foreach my $user (sort(keys(%$hashref))) {
- 		$participants[$#participants+1]='active_participant:'.$_;
+ 	    if ($hashref->{$user}>$cutoff) {
+ 		push(@participants, 'active_participant:'.$user);
              }
          }
-         untie %hash;
+         &untie_user_hash($hashref);
      }
      return (@participants,@entries);
  }
- sub chatadd {
+ sub chat_add {
-     my ($cdom,$cname,$newchat)=@_;
+     my ($cdom,$cname,$newchat,$group)=@_;
-     my %hash;
-     my $proname=&propath($cdom,$cname);
      my @entries=();
      my $time=time;
-     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
+     my $namespace = 'nohist_chatroom';
- 	    &GDBM_WRCREAT(),0640)) {
+     my $logfile = 'chatroom.log';
- 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
+     if ($group ne '') {
+         $namespace .= '_'.$group;
+         $logfile = 'chatroom_'.$group.'.log';
+     }
+     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
+ 				 &GDBM_WRCREAT());
+     if ($hashref) {
+ 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
  	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
  	my ($thentime,$idnum)=split(/\_/,$lastid);
  	my $newid=$time.'_000000';
- Line 3345  sub chatadd {
+ Line 7823  sub chatadd {
  	    $idnum=substr('000000'.$idnum,-6,6);
  	    $newid=$time.'_'.$idnum;
  	}
- 	$hash{$newid}=$newchat;
+ 	$hashref->{$newid}=$newchat;
  	my $expired=$time-3600;
- 	foreach (keys %hash) {
+ 	foreach my $comment (keys(%$hashref)) {
- 	    my ($thistime)=($_=~/(\d+)\_/);
+ 	    my ($thistime) = ($comment=~/(\d+)\_/);
  	    if ($thistime<$expired) {
- 		delete $hash{$_};
+ 		delete $hashref->{$comment};
  	    }
  	}
- 	untie %hash;
+ 	{
-     }
+ 	    my $proname=&propath($cdom,$cname);
-     {
+ 	    if (open(CHATLOG,">>$proname/$logfile")) {
- 	my $hfh;
+ 		print CHATLOG ("$time:".&unescape($newchat)."\n");
- 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
+ 	    }
- 	    print $hfh "$time:".&unescape($newchat)."\n";
+ 	    close(CHATLOG);
  	}
+ 	&untie_user_hash($hashref);
      }
  }
- Line 3448  sub thisversion {
+ Line 7927  sub thisversion {
  sub subscribe {
      my ($userinput,$clientip)=@_;
      my $result;
-     my ($cmd,$fname)=split(/:/,$userinput);
+     my ($cmd,$fname)=split(/:/,$userinput,2);
      my $ownership=&ishome($fname);
      if ($ownership eq 'owner') {
  # explitly asking for the current version?
- Line 3481  sub subscribe {
+ Line 7960  sub subscribe {
                  # the metadata
  		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
  		$fname=~s/\/home\/httpd\/html\/res/raw/;
- 		$fname="http://$thisserver/".$fname;
+                 my $protocol = $Apache::lonnet::protocol{$perlvar{'lonHostID'}};
+                 $protocol = 'http' if ($protocol ne 'https');
+ 		$fname=$protocol.'://'.&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
  		$result="$fname\n";
  	    }
  	} else {
- Line 3492  sub subscribe {
+ Line 7973  sub subscribe {
      }
      return $result;
  }
+ #  Change the passwd of a unix user.  The caller must have
+ #  first verified that the user is a loncapa user.
+ #
+ # Parameters:
+ #    user      - Unix user name to change.
+ #    pass      - New password for the user.
+ # Returns:
+ #    ok    - if success
+ #    other - Some meaningfule error message string.
+ # NOTE:
+ #    invokes a setuid script to change the passwd.
+ sub change_unix_password {
+     my ($user, $pass) = @_;
+     &Debug("change_unix_password");
+     my $execdir=$perlvar{'lonDaemons'};
+     &Debug("Opening lcpasswd pipeline");
+     my $pf = IO::File->new("|$execdir/lcpasswd > "
+ 			   ."$perlvar{'lonDaemons'}"
+ 			   ."/logs/lcpasswd.log");
+     print $pf "$user\n$pass\n$pass\n";
+     close $pf;
+     my $err = $?;
+     return ($err < @passwderrors) ? $passwderrors[$err] :
+ 	"pwchange_falure - unknown error";
+ }
  sub make_passwd_file {
-     my ($uname, $umode,$npass,$passfilename)=@_;
+     my ($uname,$udom,$umode,$npass,$passfilename,$action)=@_;
-     my $result="ok\n";
+     my $result="ok";
      if ($umode eq 'krb4' or $umode eq 'krb5') {
  	{
  	    my $pf = IO::File->new(">$passfilename");
- 	    print $pf "$umode:$npass\n";
+ 	    if ($pf) {
+ 		print $pf "$umode:$npass\n";
+                 &update_passwd_history($uname,$udom,$umode,$action);
+ 	    } else {
+ 		$result = "pass_file_failed_error";
+ 	    }
  	}
      } elsif ($umode eq 'internal') {
- 	my $salt=time;
+         my $ncpass = &hash_passwd($udom,$npass);
- 	$salt=substr($salt,6,2);
- 	my $ncpass=crypt($npass,$salt);
  	{
  	    &Debug("Creating internal auth");
  	    my $pf = IO::File->new(">$passfilename");
- 	    print $pf "internal:$ncpass\n";
+ 	    if($pf) {
+ 		print $pf "internal:$ncpass\n";
+                 &update_passwd_history($uname,$udom,$umode,$action);
+ 	    } else {
+ 		$result = "pass_file_failed_error";
+ 	    }
  	}
      } elsif ($umode eq 'localauth') {
  	{
  	    my $pf = IO::File->new(">$passfilename");
- 	    print $pf "localauth:$npass\n";
+ 	    if($pf) {
- 	}
+ 		print $pf "localauth:$npass\n";
-     } elsif ($umode eq 'unix') {
+                 &update_passwd_history($uname,$udom,$umode,$action);
- 	{
+ 	    } else {
- 	    #
+ 		$result = "pass_file_failed_error";
- 	    #  Don't allow the creation of privileged accounts!!! that would
- 	    #  be real bad!!!
- 	    #
- 	    my $uid = getpwnam($uname);
- 	    if((defined $uid) && ($uid == 0)) {
- 		&logthis(">>>Attempted to create privilged account blocked");
- 		return "no_priv_account_error\n";
- 	    }
- 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
- 	    {
- 		&Debug("Executing external: ".$execpath);
- 		&Debug("user  = ".$uname.", Password =". $npass);
- 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
- 		print $se "$uname\n";
- 		print $se "$npass\n";
- 		print $se "$npass\n";
- 	    }
- 	    my $useraddok = $?;
- 	    if($useraddok > 0) {
- 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
  	    }
- 	    my $pf = IO::File->new(">$passfilename");
- 	    print $pf "unix:\n";
  	}
+     } elsif ($umode eq 'unix') {
+ 	&logthis(">>>Attempt to create unix account blocked -- unix auth not available for new users.");
+ 	$result="no_new_unix_accounts";
      } elsif ($umode eq 'none') {
  	{
- 	    my $pf = IO::File->new(">$passfilename");
+ 	    my $pf = IO::File->new("> $passfilename");
- 	    print $pf "none:\n";
+ 	    if($pf) {
+ 		print $pf "none:\n";
+ 	    } else {
+ 		$result = "pass_file_failed_error";
+ 	    }
  	}
      } else {
- 	$result="auth_mode_error\n";
+ 	$result="auth_mode_error";
      }
      return $result;
  }
+ sub convert_photo {
+     my ($start,$dest)=@_;
+     system("convert $start $dest");
+ }
  sub sethost {
      my ($remotereq) = @_;
      my (undef,$hostid)=split(/:/,$remotereq);
+     # ignore sethost if we are already correct
+     if ($hostid eq $currenthostid) {
+ 	return 'ok';
+     }
      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
-     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
+     if (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'})
+ 	eq &Apache::lonnet::get_host_ip($hostid)) {
  	$currenthostid  =$hostid;
- 	$currentdomainid=$hostdom{$hostid};
+ 	$currentdomainid=&Apache::lonnet::host_domain($hostid);
- 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
+ #	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
      } else {
  	&logthis("Requested host id $hostid not an alias of ".
  		 $perlvar{'lonHostID'}." refusing connection");
- Line 3576  sub version {
+ Line 8089  sub version {
      return "version:$VERSION";
  }
- #There is a copy of this in lonnet.pm
+ sub get_usersession_config {
- sub userload {
+     my ($dom,$name) = @_;
-     my $numusers=0;
+     my ($usersessionconf,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
-     {
+     if (defined($cached)) {
- 	opendir(LONIDS,$perlvar{'lonIDsDir'});
+         return $usersessionconf;
- 	my $filename;
+     } else {
- 	my $curtime=time;
+         my %domconfig = &Apache::lonnet::get_dom('configuration',['usersessions'],$dom);
- 	while ($filename=readdir(LONIDS)) {
+         &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'usersessions'},3600);
- 	    if ($filename eq '.' || $filename eq '..') {next;}
+         return $domconfig{'usersessions'};
- 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
+     }
- 	    if ($curtime-$mtime < 1800) { $numusers++; }
+     return;
- 	}
+ }
- 	closedir(LONIDS);
-     }
+ sub get_prohibited {
-     my $userloadpercent=0;
+     my ($dom) = @_;
-     my $maxuserload=$perlvar{'lonUserLoadLim'};
+     my $name = 'trust';
-     if ($maxuserload) {
+     my ($trustconfig,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
- 	$userloadpercent=100*$numusers/$maxuserload;
+     unless (defined($cached)) {
+         my %domconfig = &Apache::lonnet::get_dom('configuration',['trust'],$dom);
+         &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'trust'},3600);
+         $trustconfig = $domconfig{'trust'};
+     }
+     my %prohibited;
+     if (ref($trustconfig)) {
+         foreach my $prefix (keys(%{$trustconfig})) {
+             if (ref($trustconfig->{$prefix}) eq 'HASH') {
+                 my $reject;
+                 if (ref($trustconfig->{$prefix}->{'exc'}) eq 'ARRAY') {
+                     if (grep(/^\Q$clientintdom\E$/,@{$trustconfig->{$prefix}->{'exc'}})) {
+                         $reject = 1;
+                     }
+                 }
+                 if (ref($trustconfig->{$prefix}->{'inc'}) eq 'ARRAY') {
+                     if (grep(/^\Q$clientintdom\E$/,@{$trustconfig->{$prefix}->{'inc'}})) {
+                         $reject = 0;
+                     } else {
+                         $reject = 1;
+                     }
+                 }
+                 if ($reject) {
+                     $prohibited{$prefix} = 1;
+                 }
+             }
+         }
      }
-     $userloadpercent=sprintf("%.2f",$userloadpercent);
+     return %prohibited;
-     return $userloadpercent;
  }
+ sub distro_and_arch {
+     return $dist.':'.$arch;
+ }
  # ----------------------------------- POD (plain old documentation, CPAN style)
- Line 3779  Allow for a password to be set.
+ Line 8320  Allow for a password to be set.
  Make a user.
- =item passwd
+ =item changeuserauth
  Allow for authentication mechanism and password to be changed.
- Line 3868  for each student, defined perhaps by the
+ Line 8409  for each student, defined perhaps by the
  Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
  for each student, defined perhaps by the institutional Registrar.)
+ =item iddel
+ Deletes one or more ids in a domain's id database.
  =item tmpput
  Accept and store information in temporary space.
- Line 3915  to the client, and the connection is clo
+ Line 8460  to the client, and the connection is clo
  IO::Socket
  IO::File
  Apache::File
- Symbol
  POSIX
  Crypt::IDEA
  LWP::UserAgent()
- Line 3925  Authen::Krb5
+ Line 8469  Authen::Krb5
  =head1 COREQUISITES
+ none
  =head1 OSNAMES
  linux
- Line 3934  linux
+ Line 8480  linux
  Server/Process
  =cut
+ =pod
+ =head1 LOG MESSAGES
+ The messages below can be emitted in the lond log.  This log is located
+ in ~httpd/perl/logs/lond.log  Many log messages have HTML encapsulation
+ to provide coloring if examined from inside a web page. Some do not.
+ Where color is used, the colors are; Red for sometihhng to get excited
+ about and to follow up on. Yellow for something to keep an eye on to
+ be sure it does not get worse, Green,and Blue for informational items.
+ In the discussions below, sometimes reference is made to ~httpd
+ when describing file locations.  There isn't really an httpd
+ user, however there is an httpd directory that gets installed in the
+ place that user home directories go.  On linux, this is usually
+ (always?) /home/httpd.
+ Some messages are colorless.  These are usually (not always)
+ Green/Blue color level messages.
+ =over 2
+ =item (Red)  LocalConnection rejecting non local: <ip> ne 127.0.0.1
+ A local connection negotiation was attempted by
+ a host whose IP address was not 127.0.0.1.
+ The socket is closed and the child will exit.
+ lond has three ways to establish an encyrption
+ key with a client:
+ =over 2
+ =item local
+ The key is written and read from a file.
+ This is only valid for connections from localhost.
+ =item insecure
+ The key is generated by the server and
+ transmitted to the client.
+ =item  ssl (secure)
+ An ssl connection is negotiated with the client,
+ the key is generated by the server and sent to the
+ client across this ssl connection before the
+ ssl connectionis terminated and clear text
+ transmission resumes.
+ =back
+ =item (Red) LocalConnection: caller is insane! init = <init> and type = <type>
+ The client is local but has not sent an initialization
+ string that is the literal "init:local"  The connection
+ is closed and the child exits.
+ =item Red CRITICAL Can't get key file <error>
+ SSL key negotiation is being attempted but the call to
+ lonssl::KeyFile  failed.  This usually means that the
+ configuration file is not correctly defining or protecting
+ the directories/files lonCertificateDirectory or
+ lonnetPrivateKey
+ <error> is a string that describes the reason that
+ the key file could not be located.
+ =item (Red) CRITICAL  Can't get certificates <error>
+ SSL key negotiation failed because we were not able to retrives our certificate
+ or the CA's certificate in the call to lonssl::CertificateFile
+ <error> is the textual reason this failed.  Usual reasons:
+ =over 2
+ =item Apache config file for loncapa  incorrect:
+ one of the variables
+ lonCertificateDirectory, lonnetCertificateAuthority, or lonnetCertificate
+ undefined or incorrect
+ =item Permission error:
+ The directory pointed to by lonCertificateDirectory is not readable by lond
+ =item Permission error:
+ Files in the directory pointed to by lonCertificateDirectory are not readable by lond.
+ =item Installation error:
+ Either the certificate authority file or the certificate have not
+ been installed in lonCertificateDirectory.
+ =item (Red) CRITICAL SSL Socket promotion failed:  <err>
+ The promotion of the connection from plaintext to SSL failed
+ <err> is the reason for the failure.  There are two
+ system calls involved in the promotion (one of which failed),
+ a dup to produce
+ a second fd on the raw socket over which the encrypted data
+ will flow and IO::SOcket::SSL->new_from_fd which creates
+ the SSL connection on the duped fd.
+ =item (Blue)   WARNING client did not respond to challenge
+ This occurs on an insecure (non SSL) connection negotiation request.
+ lond generates some number from the time, the PID and sends it to
+ the client.  The client must respond by echoing this information back.
+ If the client does not do so, that's a violation of the challenge
+ protocols and the connection will be failed.
+ =item (Red) No manager table. Nobody can manage!!
+ lond has the concept of privileged hosts that
+ can perform remote management function such
+ as update the hosts.tab.   The manager hosts
+ are described in the
+ ~httpd/lonTabs/managers.tab file.
+ this message is logged if this file is missing.
+ =item (Green) Registering manager <dnsname> as <cluster_name> with <ipaddress>
+ Reports the successful parse and registration
+ of a specific manager.
+ =item Green existing host <clustername:dnsname>
+ The manager host is already defined in the hosts.tab
+ the information in that table, rather than the info in the
+ manager table will be used to determine the manager's ip.
+ =item (Red) Unable to craete <filename>
+ lond has been asked to create new versions of an administrative
+ file (by a manager).  When this is done, the new file is created
+ in a temp file and then renamed into place so that there are always
+ usable administrative files, even if the update fails.  This failure
+ message means that the temp file could not be created.
+ The update is abandoned, and the old file is available for use.
+ =item (Green) CopyFile from <oldname> to <newname> failed
+ In an update of administrative files, the copy of the existing file to a
+ backup file failed.  The installation of the new file may still succeed,
+ but there will not be a back up file to rever to (this should probably
+ be yellow).
+ =item (Green) Pushfile: backed up <oldname> to <newname>
+ See above, the backup of the old administrative file succeeded.
+ =item (Red)  Pushfile: Unable to install <filename> <reason>
+ The new administrative file could not be installed.  In this case,
+ the old administrative file is still in use.
+ =item (Green) Installed new < filename>.
+ The new administrative file was successfullly installed.
+ =item (Red) Reinitializing lond pid=<pid>
+ The lonc child process <pid> will be sent a USR2
+ signal.
+ =item (Red) Reinitializing self
+ We've been asked to re-read our administrative files,and
+ are doing so.
+ =item (Yellow) error:Invalid process identifier <ident>
+ A reinit command was received, but the target part of the
+ command was not valid.  It must be either
+ 'lond' or 'lonc' but was <ident>
+ =item (Green) isValideditCommand checking: Command = <command> Key = <key> newline = <newline>
+ Checking to see if lond has been handed a valid edit
+ command.  It is possible the edit command is not valid
+ in that case there are no log messages to indicate that.
+ =item Result of password change for  <username> pwchange_success
+ The password for <username> was
+ successfully changed.
+ =item Unable to open <user> passwd to change password
+ Could not rewrite the
+ internal password file for a user
+ =item Result of password change for <user> : <result>
+ A unix password change for <user> was attempted
+ and the pipe returned <result>
+ =item LWP GET: <message> for <fname> (<remoteurl>)
+ The lightweight process fetch for a resource failed
+ with <message> the local filename that should
+ have existed/been created was  <fname> the
+ corresponding URI: <remoteurl>  This is emitted in several
+ places.
+ =item Unable to move <transname> to <destname>
+ From fetch_user_file_handler - the user file was replicated but could not
+ be mv'd to its final location.
+ =item Looking for <domain> <username>
+ From user_has_session_handler - This should be a Debug call instead
+ it indicates lond is about to check whether the specified user has a
+ session active on the specified domain on the local host.
+ =item Client <ip> (<name>) hanging up: <input>
+ lond has been asked to exit by its client.  The <ip> and <name> identify the
+ client systemand <input> is the full exit command sent to the server.
+ =item Red CRITICAL: ABNORMAL EXIT. child <pid> for server <hostname> died through a crass with this error->[<message>].
+ A lond child terminated.  NOte that this termination can also occur when the
+ child receives the QUIT or DIE signals.  <pid> is the process id of the child,
+ <hostname> the host lond is working for, and <message> the reason the child died
+ to the best of our ability to get it (I would guess that any numeric value
+ represents and errno value).  This is immediately followed by
+ =item  Famous last words: Catching exception - <log>
+ Where log is some recent information about the state of the child.
+ =item Red CRITICAL: TIME OUT <pid>
+ Some timeout occured for server <pid>.  THis is normally a timeout on an LWP
+ doing an HTTP::GET.
+ =item child <pid> died
+ The reaper caught a SIGCHILD for the lond child process <pid>
+ This should be modified to also display the IP of the dying child
+ $children{$pid}
+ =item Unknown child 0 died
+ A child died but the wait for it returned a pid of zero which really should not
+ ever happen.
+ =item Child <which> - <pid> looks like we missed it's death
+ When a sigchild is received, the reaper process checks all children to see if they are
+ alive.  If children are dying quite quickly, the lack of signal queuing can mean
+ that a signal hearalds the death of more than one child.  If so this message indicates
+ which other one died. <which> is the ip of a dead child
+ =item Free socket: <shutdownretval>
+ The HUNTSMAN sub was called due to a SIGINT in a child process.  The socket is being shutdown.
+ for whatever reason, <shutdownretval> is printed but in fact shutdown() is not documented
+ to return anything. This is followed by:
+ =item Red CRITICAL: Shutting down
+ Just prior to exit.
+ =item Free socket: <shutdownretval>
+ The HUPSMAN sub was called due to a SIGHUP.  all children get killsed, and lond execs itself.
+ This is followed by:
+ =item (Red) CRITICAL: Restarting
+ lond is about to exec itself to restart.
+ =item (Blue) Updating connections
+ (In response to a USR2).  All the children (except the one for localhost)
+ are about to be killed, the hosts tab reread, and Apache reloaded via apachereload.
+ =item (Blue) UpdateHosts killing child <pid> for ip <ip>
+ Due to USR2 as above.
+ =item (Green) keeping child for ip <ip> (pid = <pid>)
+ In response to USR2 as above, the child indicated is not being restarted because
+ it's assumed that we'll always need a child for the localhost.
+ =item Going to check on the children
+ Parent is about to check on the health of the child processes.
+ Note that this is in response to a USR1 sent to the parent lond.
+ there may be one or more of the next two messages:
+ =item <pid> is dead
+ A child that we have in our child hash as alive has evidently died.
+ =item  Child <pid> did not respond
+ In the health check the child <pid> did not update/produce a pid_.txt
+ file when sent it's USR1 signal.  That process is killed with a 9 signal, as it's
+ assumed to be hung in some un-fixable way.
+ =item Finished checking children
+ Master processs's USR1 processing is cojmplete.
+ =item (Red) CRITICAL: ------- Starting ------
+ (There are more '-'s on either side).  Lond has forked itself off to
+ form a new session and is about to start actual initialization.
+ =item (Green) Attempting to start child (<client>)
+ Started a new child process for <client>.  Client is IO::Socket object
+ connected to the child.  This was as a result of a TCP/IP connection from a client.
+ =item Unable to determine who caller was, getpeername returned nothing
+ In child process initialization.  either getpeername returned undef or
+ a zero sized object was returned.  Processing continues, but in my opinion,
+ this should be cause for the child to exit.
+ =item Unable to determine clientip
+ In child process initialization.  The peer address from getpeername was not defined.
+ The client address is stored as "Unavailable" and processing continues.
+ =item (Yellow) INFO: Connection <ip> <name> connection type = <type>
+ In child initialization.  A good connectionw as received from <ip>.
+ =over 2
+ =item <name>
+ is the name of the client from hosts.tab.
+ =item <type>
+ Is the connection type which is either
+ =over 2
+ =item manager
+ The connection is from a manager node, not in hosts.tab
+ =item client
+ the connection is from a non-manager in the hosts.tab
+ =item both
+ The connection is from a manager in the hosts.tab.
+ =back
+ =back
+ =item (Blue) Certificates not installed -- trying insecure auth
+ One of the certificate file, key file or
+ certificate authority file could not be found for a client attempting
+ SSL connection intiation.  COnnection will be attemptied in in-secure mode.
+ (this would be a system with an up to date lond that has not gotten a
+ certificate from us).
+ =item (Green)  Successful local authentication
+ A local connection successfully negotiated the encryption key.
+ In this case the IDEA key is in a file (that is hopefully well protected).
+ =item (Green) Successful ssl authentication with <client>
+ The client (<client> is the peer's name in hosts.tab), has successfully
+ negotiated an SSL connection with this child process.
+ =item (Green) Successful insecure authentication with <client>
+ The client has successfully negotiated an  insecure connection withthe child process.
+ =item (Yellow) Attempted insecure connection disallowed
+ The client attempted and failed to successfully negotiate a successful insecure
+ connection.  This can happen either because the variable londAllowInsecure is false
+ or undefined, or becuse the child did not successfully echo back the challenge
+ string.
+ =back
+ =back
+ =cut

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