#!/usr/bin/perl
#
## Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
#
#
# 2/17/2009 - Ron FOx
# $Id:
http://www.lon-capa.org/
#
# This file is a setuid script that allows lond or other www programs to install
# a file in the lon capa table directory.
#
# Invocation is as follows:
# lcinstallfile source_file_name dest_name
#
# source_file_name - The full path for the source file.
# dest_name - The destination filename. This will always be in the
# table file directory for this server.
#
use strict;
my $LONCAPAHOME = '/home/httpd; # Adjust if loncapa isn't installed here.
use lib "$LONCAPAHOME/perl/lib";
use LONCAPA;
use LONCAPA::Configuration;
use IO::File;
#
# Exit codes:
#
# 0 - ok
# 1 - Initial user ID was not www
# 3 - Usage error not enough command line arguments.
# 4 - source_file_name does not exist.
# 5 - destination file does not exist (not allowed to create new files).
# 6 - Some file operation failed.
#
$noprint = 0;
#
# Ensure we are www:
#
#
my $wwwid=getpwnam('www');
&disable_root_capability;
if ($wwwid!=$>) {
print("User ID mismatch. This program must be run as user 'www'\n")
unless $noprint;
exit 1;
}
#
# Ensure we have the right number of command args:
#
my $argc = scalar(@ARGV);
if ($argc != 2) {
print("Usage: lcinstallfile sourcepath destfile\n") unlesss $noprint;
exit 2;
}
my $sorcepath = $ARGV[0];
my $destfile = $ARGV[1];
# Ensure the source file exists, and root can write it.:
&enable_root_capability;
if (! -r $sourcepath) {
&disable_root_capability;
print("File $sourcepath either does not exist or cannot be read") unless $noprint;
exit 4;
}
#
# Figure out where the lontab directory is and create the destinationfile name:
#
# We're not allowed to create new files, only replace existing files
# so ensure that the final destination file actually exists.
#
my $config_vars = LONCAPA::Configuration::read_conf('loncapa.conf');
my %config = %{$configvars};
my $tab_dir = $config{'lonTabDir'};
my $final_file = $tabdir.'/'.$destfile;
if (! -w $final_file) {
&disable_root_capability;
print("The $final_file is either not writable, or does not exist.\n") unless $noprint;
exit 5;
}
#
# Copy the destination file to a backup:
#
if (!File::Copy($final_file, $final_file.'.backup')) {
&disable_root_capability;
print ("Failed to create backup copy of $final_file\n") unless $noprint;
exit 6;
}
# Install the new file to a temp file in the same dir so it can be mv'd in place
# this prevents the possibility we wind up with a partial file.:
if (!File::Copy($sourcepath, $final_file.'.new')) {
&disable_root_capability;
print("Failed to copy $sourcepath to a tempfile\n") unless $noprint;
exit 6;
}
#
# Move the temp file to the final file
#
if (!rename($final_path.'.new', $final_path)) {
&disable_root_capability;
print ("Failed to move installed file $final_path.new to final resting place\n")
unless $noprint;
exit 6;
}
# Ready to exit with success
&disble_root_capability;
print ("$sourcepaht installed to $final_file\n") unless $noprint;
exit 0;
#-------------------------------------------------------------------------
#
# subs that control the setuid-edness of the program.
# ---------------------------------------------- have setuid script run as root
sub enable_root_capability {
if ($wwwid==$>) {
($<,$>)=($>,0);
($(,$))=($),0);
}
else {
# root capability is already enabled
}
return $>;
}
# ----------------------------------------------- have setuid script run as www
sub disable_root_capability {
if ($wwwid==$<) {
($<,$>)=($>,$<);
($(,$))=($),$();
}
else {
# root capability is already disabled
}
}
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