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- if the file doesn't exist return NOT_FOUND rather thaen letting it
  end up loggin the error message in the webserver error logs

    1: # The LearningOnline Network
    2: # Access Handler for File Transfers
    3: #
    4: # $Id: lonracc.pm,v 1.19 2007/02/01 06:31:33 albertel Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: 
   29: package Apache::lonracc;
   30: 
   31: use strict;
   32: use Apache::Constants qw(:common :remotehost);
   33: use Apache::lonnet;
   34: use Apache::File();
   35: use IO::Socket;
   36: 
   37: sub subscribed {
   38:     my ($filename,$id) = @_;
   39: 
   40:     return 0 if (-e "$filename.subscription");
   41: 
   42:     my $hostname=$Apache::lonnet::hostname{$id};
   43:     my (undef,undef,undef,undef,$ip) = gethostbyname($hostname);
   44:     
   45:     return 0 if (length($ip) != 4);
   46: 
   47:     $ip=inet_ntoa($ip);
   48: 
   49:     my $expr='^'.quotemeta($id).':'.quotemeta($ip).':';
   50: 
   51:     my $found=0;
   52:     if (my $sh=Apache::File->new("$filename.subscription")) {
   53: 	while (my $subline=<$sh>) { if ($subline =~ /$expr/) { $found=1; } }
   54: 	$sh->close();
   55:     }
   56:     return $found;
   57: }
   58: 
   59: sub handler {
   60:     my $r = shift;
   61: 
   62:     my $filename=$r->filename;
   63:     if (!-e $filename) {
   64: 	return NOT_FOUND;
   65:     }
   66: 
   67:     my $reqhost = $r->get_remote_host(REMOTE_NOLOOKUP);
   68:     my %iphost=&Apache::lonnet::get_iphost();
   69:     my $hostids=$iphost{$reqhost};
   70:     if (!$hostids && $reqhost ne '127.0.0.1' ) {
   71: 	$r->log_reason("Unable to find a host for ".
   72: 		       $r->get_remote_host(REMOTE_NOLOOKUP));
   73: 	return FORBIDDEN;
   74:     }
   75:     if ($reqhost eq '127.0.0.1') {
   76: 	return OK;
   77:     }
   78:     my $return;
   79:     my @ids;
   80: 
   81:     foreach my $id (@{$hostids}) {
   82: 	my $uri =$r->uri;
   83: 	if (($filename=~/\.meta$/) ||
   84: 	    ($uri=~m|^/raw/uploaded|) ||
   85: 	    (-e "$filename.$id") ||
   86: 	    &subscribed($filename,$id) ) {
   87: 	    return OK;
   88: 	} else {
   89: 	    $return=FORBIDDEN;
   90: 	    push(@ids,$id);
   91: 	}
   92:     }
   93:     if ($return == FORBIDDEN) {
   94: 	$r->log_reason(join(':',@ids)." not subscribed", $r->filename);
   95: 	return FORBIDDEN;
   96:     }
   97:     $r->log_reason("Invalid request for file transfer from $reqhost", 
   98:                    $r->filename); 
   99:     return FORBIDDEN;
  100: }
  101: 
  102: 1;
  103: __END__
  104: 
  105: =head1 NAME
  106: 
  107: Apache::lonracc - Access Handler for File Transfers
  108: 
  109: =head1 SYNOPSIS
  110: 
  111: Invoked by /etc/httpd/conf/loncapa.conf:
  112: 
  113:  <LocationMatch "^/raw.*">
  114:  PerlAccessHandler Apache::lonracc
  115:  </LocationMatch>
  116: 
  117: =head1 INTRODUCTION
  118: 
  119: This module enables authentication for file transfers and works
  120: against the /res tree.
  121: 
  122: Only lond invokes the /raw namespace through its subscribe function.
  123: 
  124: This is part of the LearningOnline Network with CAPA project
  125: described at http://www.lon-capa.org.
  126: 
  127: =head1 HANDLER SUBROUTINE
  128: 
  129: This routine is called by Apache and mod_perl.
  130: 
  131: =over 4
  132: 
  133: =item *
  134: 
  135: Determine requesting host
  136: 
  137: =item *
  138: 
  139: See whether or not the requesting host is subscribed.
  140: 
  141: =item *
  142: 
  143: Respond with status of request and make log entry in case of unallowed
  144: access.
  145: 
  146: =back
  147: 
  148: =cut
  149: 
  150: 
  151: 
  152: 
  153: 
  154: 
  155: