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- Read from the filesystem instead of using LWP request when current server
  is an "authoritative" server in hosts.tab, to prevent delays on Apache
  reload for standalone machines.

    1: # The LearningOnline Network with CAPA
    2: # A debugging harness.
    3: #
    4: # $Id: londns.pm,v 1.7 2021/06/06 23:14:18 raeburn 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: 
   30: package Apache::londns;
   31: 
   32: use strict;
   33: use LONCAPA;
   34: use Apache::Constants qw(:common :http :remotehost);
   35: use Apache::lonnet;
   36: 
   37: sub serve_file {
   38:     my ($r,$dir,$file,$type)=@_;
   39:     if (($dir eq '') || ($file eq '')) {
   40:         return FORBIDDEN;
   41:     }
   42:     if (open(my $config,"<","$dir/$file")) {
   43:         my $contents = join('',<$config>);
   44:         close($config);
   45:         $r->content_type($type);
   46:         $r->send_http_header;
   47:         return OK if $r->header_only;
   48:         $r->print($contents);
   49:         return OK;
   50:     } else {
   51:         return FORBIDDEN;
   52:     }
   53: }
   54: 
   55: sub handler {
   56:     my ($r) = @_;
   57: 
   58:     my $reqhost = $r->get_remote_host(REMOTE_NOLOOKUP);
   59:     my @hostids= &Apache::lonnet::get_hosts_from_ip($reqhost);
   60:     if (!@hostids && $reqhost ne '127.0.0.1' ) {
   61:         $r->log_reason("Unable to find a host for ".
   62:                        $r->get_remote_host(REMOTE_NOLOOKUP));
   63:         return FORBIDDEN;
   64:     }
   65: 
   66:     my $command = (split('/',$r->uri))[3];
   67:     my ($dir,$file) = &Apache::lonnet::parse_getdns_url($command,$r->uri);
   68:     my %types = (
   69:                     hosts      => 'loncapa/hosts',
   70:                     domain     => 'loncapa/domain',
   71:                     checksums  => 'loncapa/versions',
   72:                     loncapaCRL => 'application/x-pem-file',
   73:                 );
   74:     if (exists($types{$command})) {
   75:         return &serve_file($r,$dir,$file,$types{$command});
   76:     }
   77:     return FORBIDDEN;
   78: }
   79: 
   80: 
   81: 1;