#!/usr/bin/perl
# $Id: lonhttpd,v 1.15 2007/07/11 18:48:20 albertel Exp $

$VERSION = "1.3.2 (Demonic/Linux/LON-CAPA Derivative $Revison$)";

# HTTPi Hypertext Tiny Truncated Process Implementation
# Copyright 1999-2001 Cameron Kaiser # All rights reserved
# Please read LICENSE # Do not strip this copyright message.
#
# LON-CAPA: find httpi license and readme at CVS loncom/license
#

use lib '/home/httpd/lib/perl/';
use LONCAPA::Configuration();
%loncapavar=%{&LONCAPA::Configuration::read_conf('loncapa.conf')};
$port_to_use=$loncapavar{'lonhttpdPort'};
if (!defined($port_to_use)) {
    $port_to_use='8080';
}

# The main server is running on 80, so exit in this case
if ($port_to_use eq '80') { die('Apache is already on Port 80'); }

%system_content_types =
	("html" => "text/html",
	 "htm" => "text/html",
	 "wml" => "text/vnd.wap.wml",
	 "wbmp" => "image/vnd.wap.wbmp",
	 "wbm" => "image/vnd.wap.wbmp",
	 "xbm" => "image/x-xbitmap",
	 "pdf" => "application/pdf",
	 "fdf" => "application/vnd.fdf",
	 "bin" => "application/octet-stream",
	 "class" => "application/octet-stream",
	 "jar" => "application/octet-stream",
	 "js" => "application/x-javascript",
	 "lnk" => "application/x-hyperlink",
	 "wav" => "audio/x-wav",
	 "mp3" => "audio/x-mpeg",
	 "tif" => "image/tiff",
	 "tiff" => "image/tiff",
	 "mid" => "audio/x-midi",
	 "txt" => "text/plain",
	 "gif" => "image/gif",
	 "sit" => "application/x-stuffit",
	 "zip" => "application/x-zip-compressed",
	 "lzh" => "application/octet-stream",
	 "lha" => "application/octet-stream",
	 "gz"  => "application/x-gzip",
	 "mov" => "movie/quicktime",
	 "mpeg" => "video/mpeg",
	 "mpg" => "video/mpeg",
	 "jpeg" => "image/jpeg",
	 "jpg" => "image/jpeg",
         "png" => "image/png");

$logfile = "/home/httpd/perl/logs/lonhttpd.log";

# Write out PID

$pidfile="/home/httpd/perl/logs/lonhttpd.pid";

if (-e $pidfile) {
   open(LFH,"$pidfile");
   my $pide=<LFH>;
   chomp($pide);
   close(LFH);
   if (kill 0 => $pide) { die "already running"; }
}

$path = "/home/httpd/html";
$sockaddr = 'S n a4 x8';


%content_types =
	("html" => "text/html",
	 "htm" => "text/html");
%restrictions =
	("/"        => "#.##",  # deny everything
         "/res/adm" => ".###",  # allow /res/adm
         "/adm"     => ".###",  # allow /adm
	 "/status"  => ".####lonadm:oeRooOvb3HtpI");
		# See documentation for interpreting this string.

$headers = <<"EOF";
Server: HTTPi/$VERSION
MIME-Version: 1.0
EOF

%virtual_files =
	(
"/adm/lonLCDfont/0.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/0.gif" ] ,
"/adm/lonLCDfont/1.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/1.gif" ] ,
"/adm/lonLCDfont/2.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/2.gif" ] ,
"/adm/lonLCDfont/3.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/3.gif" ] ,
"/adm/lonLCDfont/4.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/4.gif" ] ,
"/adm/lonLCDfont/5.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/5.gif" ] ,
"/adm/lonLCDfont/6.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/6.gif" ] ,
"/adm/lonLCDfont/7.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/7.gif" ] ,
"/adm/lonLCDfont/8.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/8.gif" ] ,
"/adm/lonLCDfont/9.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/9.gif" ] ,
"/adm/lonLCDfont/a.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/a.gif" ] ,
"/adm/lonLCDfont/b.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/b.gif" ] ,
"/adm/lonLCDfont/c.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/c.gif" ] ,
"/adm/lonLCDfont/d.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/d.gif" ] ,
"/adm/lonLCDfont/e.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/e.gif" ] ,
"/adm/lonLCDfont/f.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/f.gif" ] ,
"/adm/lonLCDfont/g.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/g.gif" ] ,
"/adm/lonLCDfont/h.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/h.gif" ] ,
"/adm/lonLCDfont/i.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/i.gif" ] ,
"/adm/lonLCDfont/j.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/j.gif" ] ,
"/adm/lonLCDfont/k.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/k.gif" ] ,
"/adm/lonLCDfont/l.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/l.gif" ] ,
"/adm/lonLCDfont/m.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/m.gif" ] ,
"/adm/lonLCDfont/n.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/n.gif" ] ,
"/adm/lonLCDfont/o.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/o.gif" ] ,
"/adm/lonLCDfont/p.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/p.gif" ] ,
"/adm/lonLCDfont/q.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/q.gif" ] ,
"/adm/lonLCDfont/r.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/r.gif" ] ,
"/adm/lonLCDfont/s.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/s.gif" ] ,
"/adm/lonLCDfont/t.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/t.gif" ] ,
"/adm/lonLCDfont/u.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/u.gif" ] ,
"/adm/lonLCDfont/v.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/v.gif" ] ,
"/adm/lonLCDfont/w.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/w.gif" ] ,
"/adm/lonLCDfont/x.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/x.gif" ] ,
"/adm/lonLCDfont/y.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/y.gif" ] ,
"/adm/lonLCDfont/z.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/z.gif" ] ,
"/adm/lonLCDfont/colon.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/colon.gif" ] ,
"/adm/lonLCDfont/slash.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/slash.gif" ] ,
"/adm/lonLCDfont/hyphen.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/hyphen.gif" ] ,
"/adm/lonLCDfont/space.gif" => [ "image/gif", "FILE",
		"/home/httpd/html/adm/lonLCDfont/space.gif" ] ,
	);

%content_types = (%system_content_types, %content_types);
undef %system_content_types;

while (($file, $arrayref) = each(%virtual_files)) {
	my ($mime, $type, $block) = (@{ $arrayref });
	next if ($type ne 'FILE');
	if(open(S, "$block")) {
		$j = $/; undef $/; $virtual_files{$file}->[2] = scalar(<S>);
		$/ = $j; close(S);
	} else {
		warn "while getting virtual file $file: $!\n";
		map_delete(%virtual_files, $file);
	}
}
if ($pid = fork()) { exit; }

#
# Store parent PID
#

open (PIDSAVE,">$pidfile");
print PIDSAVE "$$\n";
close(PIDSAVE);

$0 = "lonhttpd: (dhttpi) binding port ...";
$bindthis = pack($sockaddr, 2, $port_to_use,
		 pack('l', chr(0).chr(0).chr(0).chr(0)));
socket(S, 2, 1, 6);
setsockopt(S, 1, 2, 1);
bind(S, $bindthis) || die("$0: while binding port $port_to_use:\n\"$!\"\n");
listen(S, 128);
$0 = "lonhttpd: (dhttpi) connected and waiting ANY:$port_to_use";

$statiosuptime = time();

###############################################################
# WHITE HATS ONLY BELOW THIS POINT -- SEE DOCUMENTATION FIRST #
###############################################################

sub sock_to_host {
	local($sock) = getpeername(STDIN);

	return (undef, undef, undef) if (!$sock);
	local($AFC, $port, $thataddr, $zero) = unpack($sockaddr, $sock);
	local($ip) = join('.', unpack("C4", $thataddr));
	return ($ip, $port, $ip);
}

sub htsponse {
	($currentcode, $currentstring) = (@_);
	return if (0+$httpver < 1);
	local($what) = <<"EOF";
HTTP/$httpver $currentcode $currentstring
${headers}Date: $rfcdate
EOF
	$what =~ s/\n/\r\n/g;
	print stdout $what;
	&hthead("Connection: close") if (0+$httpver > 1);
}

sub hthead {
	local($header, $term) = (@_);
	return if (0+$httpver < 1);
	print stdout "$header\r\n" , ($term) ? "\r\n" : "";
}

sub htcontent {
	local($what, $ctype, $mode) = (@_);
	($contentlength) = $mode || length($what);
	&hthead("Content-Length: $contentlength");
	&hthead("Content-Type: $ctype", 1);
	return if ($method eq 'HEAD' || $mode);
	print stdout $what;
}

sub log {
 	if (open(J, ">>$logfile")) {
		local $q = $address . (($variables) ? "?$variables" : "");
		$contentlength += 0;
		$contentlength = 0 if ($method eq 'HEAD');
		local ($hostname, $port, $ip) = &sock_to_host();
		$hostname = $hostname || "-";
		$httpuser = $httpuser || "-";
		print J <<"EOF";
$hostname - $httpuser [$date] "$method $q HTTP/$httpver" $currentcode $contentlength "$httpref" "$httpua"
EOF
		close(J); }
	}


sub bye { exit; }

sub goodbye { unlink($pidfile); exit; }

sub dead {
	&htsponse(500, "Server Error");
	&hterror("Server Error", <<"EOF");
While handling a request for resource $address, the server crashed. Please
attempt to notify the administrators.
<p>Useful(?) debugging information:
<pre>
@_
</pre>
EOF
	&log; unlink($pidfile); exit;
}

$SIG{'__DIE__'} = \&dead;
$SIG{'ALRM'} = \&bye;
$SIG{'TERM'} = $SIG{'INT'} = \&goodbye;

sub master {
	$0 = "lonhttpd: (dhttpi) handling request";
# $sock = getpeername(STDIN);
$rfcdate = scalar gmtime;
($dow, $mon, $dt, $tm, $yr) = ($rfcdate =~
	m/(...) (...) (..) (..:..:..) (....)/);
$dt += 0; $yr += 0;
$rfcdate = "$dow, $dt $mon $yr $tm GMT";
$date = scalar localtime;
($dow, $mon, $dt, $tm, $yr) = ($date =~
	m/(...) (...) (..) (..:..:..) (....)/);
$dt += 0;
$dt = substr("0$dt", length("0$dt") - 2, 2);
$date = "$dt/$mon/$yr:$tm +0000"; 

select(STDOUT); $|=1; $address = 0; 
alarm 1;
while (<STDIN>) {
	if(/^([A-Z]+)\s+(\S+)\s+(\S*)/) {
		$method = $1;
		$address = $2; 
		$httpver = $3;
		$httpref = '';
		$httpua = '';
		$httpver = ($httpver =~ m#HTTP/([0-9]\.[0-9]+)#) ?
			($1) : (0.9);
		$address =~ s#^http://[^/]+/#/#;
		next unless ($httpver < 1);
	} else {
		s/[\r\l\n\s]+$//;
		(/^Host: (.+)/i) && ($httphost = $1) && ($httphost =~
			s/:\d+$//);
		(/^Referer: (.+)/i) && ($httpref = $1);
		(/^User-agent: (.+)/i) && ($httpua = $1);
		(/^Content-length: (\d+)/i) && ($ENV{'CONTENT_LENGTH'} =
			$httpcl = $1);
		(/^Content-type: (.+)/i) && ($ENV{'CONTENT_TYPE'} =
			$httpct = $1);
		(/^Expect: /) && ($expect = 1);
		(/^Authorization: Basic (.+)/i) && ($httprawu = $1);
		(/^Range: (.+)/i) && ($ENV{'CONTENT_RANGE'} = $1);
		next unless (/^$/);
	}
	if ($expect) {
		&htsponse(417, "Expectation Failed");
		&hterror("Expectation Failed",
			"The server does not support this method.");
		&log; exit;
	}
	if (!$address || (0+$httpver > 1 && !$httphost)) {
		&htsponse(400, "Bad Request");
		&hterror("Bad Request",
			"The server cannot understand your request.");
		&log; exit;
	}
	if ($method !~ /^(GET|HEAD|POST)$/) {
		&htsponse(501, "Illegal Method");
		&hterror("Illegal Method",
			"Only GET, HEAD and POST are supported.");
		&log; exit;
	}
	($address, $variables) = split(/\?/, $address);
	$address =~ s/%([0-9a-fA-F]{2})/pack("H2", $1)/eg;
	$address=~ s#^/?#/#;
	1 while $address =~ s#/\.(/|$)#\1#;
        1 while $address =~ s#/[^/]*/\.\.(/|$)#\1#;
	1 while $address =~ s#^/\.\.(/|$)#\1#;
	$fail = 1;
#
# Heavily customized for LON-CAPA
#
	$address=~s/\/+/\//g;
        if ($address=~/^\/(status|adm\/|res\/adm\/)/) {
            $fail = 0;
        } elsif ($address =~ /^\/res\/([\w\.\-]+)\/\1\-domainconfig\/(logo|domlogo|img)\/[^\/]+$/) {
            $fail = 0;
        }
#
# because existing restriction matrix would not do precedence across rules
#
#	J: foreach(sort { length $a <=> length $b }
#			keys %restrictions) {
#		next if ($address !~ /^$_/);
#		($allowip, $denyip, $allowua, $denyua, $auser) =
#			split(/#/, $restrictions{$_});
#		if ($allowip || $denyip) {
#			($hostname, $port, $ip) = &sock_to_host();
#			($allowip && $ip !~ /$allowip/) && ($fail = 1,
#				last J);
#			($denyip && $ip =~ /$denyip/) && ($fail = 1,
#				last J);
#		}
#		($allowua && $httpua !~ /$allowua/) &&
#			($fail = 2, last J);
#		($denyua && $httpua =~ /$denyua/) &&
#			($fail = 2, last J);
#	}
	if ($fail) {
		&htsponse(403, "Forbidden");
		if ($fail == 1) {
			&hterror("Wrong URL", <<"EOF");
You might want to remove the "<tt>:$port_to_use</tt>" from the web page address (URL).
EOF
			&log; exit;
		} else {
			&hterror("Forbidden (Browser Disallowed)", <<"EOF");
The browser you are using (<i>$httpua</i>) is not capable of or
is not allowed access to this resource.
EOF
			&log; exit;
		}
	}
	if ($auser) {
		$httprawu =~ tr#A-Za-z0-9+/##cd;
		$httprawu =~ tr#A-Za-z0-9+/# -_#;
		$httprawu = unpack("u", pack("c", 32+0.75*length($httprawu))
			. $httprawu);
		($httpuser, $httppw) = split(/:/, $httprawu);
		$fail = 1;
		foreach $user (split(/,/, $auser)) {
			($user, $pw) = split(/:/, $user);
			($fail = 0, last) if ($user eq $httpuser &&
				crypt($httppw, substr($pw, 0, 2)) eq $pw);
		}
		if ($fail) {
			$httpuser = '';
			&htsponse(401, "Authorization Required");
			&hthead("WWW-Authenticate: Basic realm=\"$address\"");
			&hterror("Authorization Required", <<"EOF");
You must provide a username and password to use this resource. Either you
entered this information incorrectly, or your browser does not know how to
present the credentials required.
EOF
			&log; exit;
		}
	}

	alarm 0;

	if ($address eq '/status') {
		&htsponse(200, "OK");
		$contentlength = 0; # kludge
		&log;
		if(open(S, $logfile)) {
			seek(S, -5000, 2);
			undef $/;
			$logsnap = <S>;
			$logsnap =~ s/^[^\n]+\n//s if
				(length($logsnap) > 4999);
			close(S);
		}
		$p = (time() - $statiosuptime);
		$rps = $p/$statiosreq;
		$d = int($p / 86400); $p -= $d * 86400;
		$h = int($p / 3600); $p -= $h * 3600;
		$m = int($p / 60); $s = $p - ($m * 60);
		("0$s" =~ /(\d{2})$/) && ($s = $1);
		("0$m" =~ /(\d{2})$/) && ($m = $1);
		$h +=0; $d += 0;
		$suptime = scalar localtime $statiosuptime;
		&htcontent(<<"EOF", "text/html");
<html>
<head>
<title>
LonHTTPD (HTTPi) Status
</title>
</head>
<body bgcolor = "#ffffff" text = "#000000" vlink = "#0000ff" link = "#0000ff">
<h1>LonHTTPD (HTTPi) Server Status (<code>$VERSION</code>)</h1>
<h3>lonhttpd on port $port_to_use</h3>
<b>Started at:</b> $suptime<br>
<b>Uptime:</b> $d days, $h:$m:$s<br>
<b>Last request time:</b> $statiosltr<p>
<b>Requests received:</b> $statiosreq<br>
<b>Average time between requests:</b> ${rps}s
<p>
<b>Most recent requests:</b>
<form action = "/status" method = "post">
<textarea name = "bletch" rows = "8" cols = "70">
$logsnap
</textarea>
</form>
<hr>
<address>maintained by <a href =
"http://httpi.floodgap.com/">httpi/$VERSION</a></address>
</body>
</html>
EOF
		exit;
	}
	if (defined $virtual_files{$address}) {
		$virt_buffer = 1;
		$mtime = $statiosuptime; # thus always needed
		goto SERVEIT;		# yes, it's bad but it's fast
	}
	$raddress = "$path$address"
	;
	&hterror301("$address/")
		if ($address !~ m#/$# && -d $raddress);
	$raddress = "${raddress}index.html" if (-d $raddress);
	if(!sysopen(S, $raddress, 0)) { &hterror404; } else {
		if (-x $raddress) {
			$currentcode = 100;
			&log;
			if (!$<) {
				($x,$x,$x,$x,$uid,$gid) = stat(S);
				(!$uid || !$gid) &&
					die "executable is root-owned";
				$> = $uid || die "can't set effuid";
				$) = $gid || die "can't set effgid";
			}
			($hostname, $port, $ip) = &sock_to_host() if (!$port);
			$ENV{'REQUEST_METHOD'} = $method;
			$ENV{'SERVER_NAME'} = "localhost";
			$ENV{'SERVER_PROTOCOL'} = "HTTP/$httpver";
			$ENV{'SERVER_SOFTWARE'} = "HTTPi/$VERSION";
			$ENV{'SERVER_PORT'} = "$port_to_use";
			$ENV{'SERVER_URL'} = "http://localhost:$port_to_use/";
			$ENV{'SCRIPT_FILENAME'} = $raddress;
			$ENV{'SCRIPT_NAME'} = $address;
			$ENV{'REMOTE_HOST'} = $hostname;
			$ENV{'REMOTE_ADDR'} = $ip;
			$ENV{'REMOTE_PORT'} = $port;
			$ENV{'QUERY_STRING'} = $variables;
			$ENV{'HTTP_USER_AGENT'} = $httpua;
			$ENV{'HTTP_REFERER'} = $httpref;
			if ($pid = fork()) { exit; } else {
				if ($method eq 'POST') { # needs stdin
					open(W, "|$raddress") || die
						"can't POST to $raddress";
					read(STDIN, $buf, $httpcl);
					print W $buf;
					exit;
				}
				exec "$raddress", "$variables";
				die "exec() returned -1";
			}
		}
		($x,$x,$x,$x,$x,$x,$x,$length,$x,$mtime) = stat(S);
		$ctype = 0;
		foreach(keys %content_types) {
			if ($raddress =~ /\.$_$/i) {
				$ctype = $content_types{$_};
			}
		}
SERVEIT:	$ctype ||= 'text/plain';
		&htsponse(200, "OK");
		$mtime = scalar gmtime $mtime;
		($dow, $mon, $dt, $tm, $yr) =
			($mtime =~ m/(...) (...) (..) (..:..:..) (....)/);
		$dt += 0; $yr += 0;
		&hthead("Last-Modified: $dow, $dt $mon $yr $tm GMT");
		if ($pid = fork()) { exit; }
		if ($virt_buffer) {
			&htcontent($virtual_files{$address}->[2],
				$virtual_files{$address}->[0], 0);
		} else {
			&htcontent("", $ctype, $length);
			unless ($method eq 'HEAD') {
				while(!eof(S)) {
					read(S, $q, 16384);
					print stdout $q;
				}
			}
		}
		alarm 0;
	}
	&log;
	exit;
}

exit;
}


sub hterror {
	local($errstr, $expl) = (@_);
	&htcontent(<<"EOF", "text/html");
<html>
<body>
<h1>$errstr</h1>
$expl
<hr>
<address><a href = "http://httpi.floodgap.com/">httpi/$VERSION</a>
by Cameron Kaiser</address>
</body>
</html>
EOF
	}

sub hterror404 {
	&htsponse(404, "File Not Found");
	&hterror("File Not Found",
		"The resource $address was not found on this system.");
}

sub hterror301 {
	&htsponse(301, "Moved Permanently");
	&hthead("Location: @_");
	&hterror("Resource Moved Permanently",
		"This resource has moved <a href = \"@_\">here</a>.");
	$keep = 0; &log; exit;
}

for (;;) {
	$addr=accept(NS,S);
	$statiosltr = scalar localtime;
	$statiosreq++;
	if ($pid = fork()) {
		$0 = "lonhttpd: (dhttpi) waiting for child process";
		waitpid($pid, 0);
		$0 = "lonhttpd: (dhttpi) on ANY:$port_to_use, last request " .
			scalar localtime;
		close(NS);
	} else {
		$0 = "lonhttpd: (dhttpi) child switching to socket";
		open(STDIN, "<&NS");
		open(STDOUT, ">&NS");
		&master;
		exit;
	}
}
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at 
 root@localhost to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>