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Diff for /loncom/auth/lonauth.pm between versions 1.134 and 1.142

version 1.134, 2014/04/30 21:51:30 version 1.142, 2017/02/17 14:34:21
Line 1 Line 1
 # The LearningOnline Network  # The LearningOnline Network
 # User Authentication Module  # User Authentication Module
 #  #
 # $Id$  # $Id$
 #  #
 # Copyright Michigan State University Board of Trustees  # Copyright Michigan State University Board of Trustees
 #  #
 # This file is part of the LearningOnline Network with CAPA (LON-CAPA).  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 #  #
 # LON-CAPA is free software; you can redistribute it and/or modify  # 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  # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2 of the License, or  # the Free Software Foundation; either version 2 of the License, or
 # (at your option) any later version.  # (at your option) any later version.
 #  #
 # LON-CAPA is distributed in the hope that it will be useful,  # LON-CAPA is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of  # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.  # GNU General Public License for more details.
 #  #
 # You should have received a copy of the GNU General Public License  # You should have received a copy of the GNU General Public License
 # along with LON-CAPA; if not, write to the Free Software  # along with LON-CAPA; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #  #
 # /home/httpd/html/adm/gpl.txt  # /home/httpd/html/adm/gpl.txt
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
   
 package Apache::lonauth;  package Apache::lonauth;
   
 use strict;  use strict;
 use LONCAPA;  use LONCAPA qw(:DEFAULT :match);
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
 use CGI qw(:standard);  use CGI qw(:standard);
 use DynaLoader; # for Crypt::DES version  use DynaLoader; # for Crypt::DES version
 use Crypt::DES;  use Crypt::DES;
 use Apache::loncommon();  use Apache::loncommon();
 use Apache::lonnet;  use Apache::lonnet;
 use Apache::lonmenu();  use Apache::lonmenu();
 use Apache::createaccount;  use Apache::createaccount;
 use Fcntl qw(:flock);  use Fcntl qw(:flock);
 use Apache::lonlocal;  use Apache::lonlocal;
 use Apache::File();  use Apache::File();
 use HTML::Entities;  use HTML::Entities;
     
 # ------------------------------------------------------------ Successful login  # ------------------------------------------------------------ Successful login
 sub success {  sub success {
     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,      my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
  $form) = @_;   $form) = @_;
   
 # ------------------------------------------------------------ Get cookie ready  # ------------------------------------------------------------ Get cookie ready
     my $cookie =      my $cookie =
  &Apache::loncommon::init_user_environment($r, $username, $domain,   &Apache::loncommon::init_user_environment($r, $username, $domain,
   $authhost, $form,    $authhost, $form,
   {'extra_env' => $extra_env,});    {'extra_env' => $extra_env,});
   
     my $public=($username eq 'public' && $domain eq 'public');      my $public=($username eq 'public' && $domain eq 'public');
   
     if ($public or $lowerurl eq 'noredirect') { return $cookie; }      if ($public or $lowerurl eq 'noredirect') { return $cookie; }
   
 # -------------------------------------------------------------------- Log this  # -------------------------------------------------------------------- Log this
   
     &Apache::lonnet::log($domain,$username,$authhost,      &Apache::lonnet::log($domain,$username,$authhost,
                          "Login $ENV{'REMOTE_ADDR'}");                           "Login $ENV{'REMOTE_ADDR'}");
   
 # ------------------------------------------------- Check for critical messages  # ------------------------------------------------- Check for critical messages
   
     my @what=&Apache::lonnet::dump('critical',$domain,$username);      my @what=&Apache::lonnet::dump('critical',$domain,$username);
     if ($what[0]) {      if ($what[0]) {
  if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {   if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
     $lowerurl='/adm/email?critical=display';      $lowerurl='/adm/email?critical=display';
         }          }
     }      }
   
 # ------------------------------------------------------------ Get cookie ready  # ------------------------------------------------------------ Get cookie ready
     $cookie="lonID=$cookie; path=/";      $cookie="lonID=$cookie; path=/; HttpOnly";
 # -------------------------------------------------------- Menu script and info  # -------------------------------------------------------- Menu script and info
     my $destination = $lowerurl;      my $destination = $lowerurl;
   
     if (defined($form->{role})) {      if (defined($form->{role})) {
         my $envkey = 'user.role.'.$form->{role};          my $envkey = 'user.role.'.$form->{role};
         my $now=time;          my $now=time;
         my $then=$env{'user.login.time'};          my $then=$env{'user.login.time'};
         my $refresh=$env{'user.refresh.time'};          my $refresh=$env{'user.refresh.time'};
         my $update=$env{'user.update.time'};          my $update=$env{'user.update.time'};
         if (!$update) {          if (!$update) {
             $update = $then;              $update = $then;
         }          }
         if (exists($env{$envkey})) {          if (exists($env{$envkey})) {
             my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);              my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
             &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,              &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
                                          \$trolecode,\$tstatus,\$tstart,\$tend);                                           \$trolecode,\$tstatus,\$tstart,\$tend);
             if ($tstatus eq 'is') {              if ($tstatus eq 'is') {
                 $destination  .= ($destination =~ /\?/) ? '&' : '?';                  $destination  .= ($destination =~ /\?/) ? '&' : '?';
                 my $newrole = &HTML::Entities::encode($form->{role},'"<>&');                  my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
                 $destination .= 'selectrole=1&'.$newrole.'=1';                  $destination .= 'selectrole=1&'.$newrole.'=1';
             }              }
         }          }
     }      }
     if (defined($form->{symb})) {      if (defined($form->{symb})) {
         my $destsymb = $form->{symb};          my $destsymb = $form->{symb};
         $destination  .= ($destination =~ /\?/) ? '&' : '?';          $destination  .= ($destination =~ /\?/) ? '&' : '?';
         if ($destsymb =~ /___/) {          if ($destsymb =~ /___/) {
             # FIXME Need to deal with encrypted symbs and urls as needed.              # FIXME Need to deal with encrypted symbs and urls as needed.
             my ($map,$resid,$desturl)=split(/___/,$destsymb);              my ($map,$resid,$desturl)=split(/___/,$destsymb);
             unless ($desturl=~/^(adm|editupload|public)/) {              $desturl = &Apache::lonnet::clutter($desturl);
                 $desturl = &Apache::lonnet::clutter($desturl);              $desturl = &HTML::Entities::encode($desturl,'"<>&');
             }              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
             $desturl = &HTML::Entities::encode($desturl,'"<>&');              $destination .= 'destinationurl='.$desturl.
             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');                              '&destsymb='.$destsymb;
             $destination .= 'destinationurl='.$desturl.          } else {
                             '&destsymb='.$destsymb;              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
         } else {              $destination .= 'destinationurl='.$destsymb;
             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');          }
             $destination .= 'destinationurl='.$destsymb;      }
         }      if ($destination =~ m{^/adm/roles}) {
     }          $destination  .= ($destination =~ /\?/) ? '&' : '?';
     if ($destination =~ m{^/adm/roles}) {          $destination .= 'source=login';
         $destination  .= ($destination =~ /\?/) ? '&' : '?';      }
         $destination .= 'source=login';  
     }      my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
       my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
     my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');      my $brcrum = [{'href' => '',
     my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';                     'text' => 'Successful Login'},];
     my $brcrum = [{'href' => '',      my $args = {'bread_crumbs' => $brcrum,};
                    'text' => 'Successful Login'},];      unless ((defined($form->{role})) || (defined($form->{symb}))) {
     my $start_page=&Apache::loncommon::start_page('Successful Login',          my $update=$env{'user.update.time'};
                                                   $header,          if (!$update) {
                                                   {'bread_crumbs' => $brcrum,});              $update = $env{'user.login.time'};
     my $end_page  =&Apache::loncommon::end_page();          }
           my %roles_in_env;
  my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';          my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
 # ------------------------------------------------- Output for successful login          if ($showcount == 1) {
               foreach my $rolecode (keys(%roles_in_env)) {
     &Apache::loncommon::content_type($r,'text/html');                  my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
     $r->header_out('Set-cookie' => $cookie);                  if ($cid) {
     $r->send_http_header;                      my %coursedescription =
                           &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
     my %lt=&Apache::lonlocal::texthash(                      if ($coursedescription{'type'} eq 'Placement') {
        'wel' => 'Welcome',                          $args->{'crstype'} = 'Placement';
        'pro' => 'Login problems?',                      }
        );                      last;
     my $loginhelp = &loginhelpdisplay($domain);                  }
     if ($loginhelp) {              }
         $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';          }
     }      }
       my $start_page=&Apache::loncommon::start_page('Successful Login',
     my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');                                                     $header,$args);
     $r->print(<<ENDSUCCESS);      my $end_page  =&Apache::loncommon::end_page();
 $start_page  
 $windowinfo   my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
 <h1>$lt{'wel'}</h1>  # ------------------------------------------------- Output for successful login
 $welcome  
 $loginhelp      &Apache::loncommon::content_type($r,'text/html');
 $continuelink      $r->header_out('Set-cookie' => $cookie);
 $end_page      $r->send_http_header;
 ENDSUCCESS  
     return;      my %lt=&Apache::lonlocal::texthash(
 }         'wel' => 'Welcome',
          'pro' => 'Login problems?',
 # --------------------------------------------------------------- Failed login!         );
       my $loginhelp = &loginhelpdisplay($domain);
 sub failed {      if ($loginhelp) {
     my ($r,$message,$form) = @_;          $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
     (undef,undef,undef,my $clientmathml,my $clientunicode) =      }
         &Apache::loncommon::decode_user_agent();  
     my $args = {};      my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
     if ($clientunicode && !$clientmathml) {      $r->print(<<ENDSUCCESS);
         $args = {'browser.unicode' => 1};  $start_page
     }  $windowinfo
   <h1>$lt{'wel'}</h1>
     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);  $welcome
     my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});  $loginhelp
     my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});  $continuelink
     if (&Apache::lonnet::domain($udom,'description') eq '') {  $end_page
         undef($udom);  ENDSUCCESS
     }      return;
     my $retry = '/adm/login';  }
     if ($uname eq $form->{'uname'}) {  
         $retry .= '?username='.$uname;  # --------------------------------------------------------------- Failed login!
     }  
     if ($udom) {  sub failed {
         $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;      my ($r,$message,$form) = @_;
     }      (undef,undef,undef,my $clientmathml,my $clientunicode) =
     if (exists($form->{role})) {          &Apache::loncommon::decode_user_agent();
         my $role = &Apache::loncommon::cleanup_html($form->{role});      my $args = {};
         if ($role ne '') {      if ($clientunicode && !$clientmathml) {
             $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;          $args = {'browser.unicode' => 1};
         }      }
     }  
     if (exists($form->{symb})) {      my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
         my $symb = &Apache::loncommon::cleanup_html($form->{symb});      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
         if ($symb ne '') {      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
             $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;      if (&Apache::lonnet::domain($udom,'description') eq '') {
         }          undef($udom);
     }      }
     my $end_page = &Apache::loncommon::end_page();      my $retry = '/adm/login';
     &Apache::loncommon::content_type($r,'text/html');      if ($uname eq $form->{'uname'}) {
     $r->send_http_header;          $retry .= '?username='.$uname;
     my @actions =      }
          (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));      if ($udom) {
     my $loginhelp = &loginhelpdisplay($udom);          $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
     if ($loginhelp) {      }
         push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');      if (exists($form->{role})) {
     }          my $role = &Apache::loncommon::cleanup_html($form->{role});
     #FIXME: link to helpdesk might be added here          if ($role ne '') {
               $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
     $r->print(          }
        $start_page      }
       .'<h2>'.&mt('Sorry ...').'</h2>'      if (exists($form->{symb})) {
       .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'          my $symb = &Apache::loncommon::cleanup_html($form->{symb});
       .&Apache::lonhtmlcommon::actionbox(\@actions)          if ($symb ne '') {
       .$end_page              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
     );          }
  }      }
       my $end_page = &Apache::loncommon::end_page();
 # ------------------------------------------------------------------ Rerouting!      &Apache::loncommon::content_type($r,'text/html');
       $r->send_http_header;
 sub reroute {      my @actions =
     my ($r) = @_;           (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
     &Apache::loncommon::content_type($r,'text/html');      my $loginhelp = &loginhelpdisplay($udom);
     $r->send_http_header;      if ($loginhelp) {
     my $msg='<b>'.&mt('Sorry ...').'</b><br />'          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
            .&mt('Please [_1]log in again[_2].');      }
     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});      #FIXME: link to helpdesk might be added here
 }  
       $r->print(
 # ---------------------------------------------------------------- Main handler         $start_page
         .'<h2>'.&mt('Sorry ...').'</h2>'
 sub handler {        .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
     my $r = shift;        .&Apache::lonhtmlcommon::actionbox(\@actions)
     my $londocroot = $r->dir_config('lonDocRoot');        .$end_page
     my $form;      );
 # Are we re-routing?   }
     if (-e "$londocroot/lon-status/reroute.txt") {  
  &reroute($r);  # ------------------------------------------------------------------ Rerouting!
  return OK;  
     }  sub reroute {
       my ($r) = @_;
     &Apache::lonlocal::get_language_handle($r);      &Apache::loncommon::content_type($r,'text/html');
       $r->send_http_header;
 # -------------------------------- Prevent users from attempting to login twice      my $msg='<b>'.&mt('Sorry ...').'</b><br />'
     my $handle = &Apache::lonnet::check_for_valid_session($r);             .&mt('Please [_1]log in again[_2].');
     if ($handle ne '') {      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
         my $lonidsdir=$r->dir_config('lonIDsDir');  }
         if ($handle=~/^publicuser\_/) {  
 # For "public user" - remove it, we apparently really want to login  # ---------------------------------------------------------------- Main handler
             unlink($r->dir_config('lonIDsDir')."/$handle.id");  
         } else {  sub handler {
 # Indeed, a valid token is found      my $r = shift;
             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);      my $londocroot = $r->dir_config('lonDocRoot');
     &Apache::loncommon::content_type($r,'text/html');  # Are we re-routing?
     $r->send_http_header;      if (-e "$londocroot/lon-status/reroute.txt") {
     my $start_page =    &reroute($r);
         &Apache::loncommon::start_page('Already logged in');   return OK;
     my $end_page =       }
         &Apache::loncommon::end_page();  
             my $dest = '/adm/roles';      &Apache::lonlocal::get_language_handle($r);
             if ($env{'form.firsturl'} ne '') {  
                 $dest = $env{'form.firsturl'};  # -------------------------------- Prevent users from attempting to login twice
             }      my $handle = &Apache::lonnet::check_for_valid_session($r);
             $r->print(      if ($handle ne '') {
                $start_page          my $lonidsdir=$r->dir_config('lonIDsDir');
               .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'          if ($handle=~/^publicuser\_/) {
               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'  # For "public user" - remove it, we apparently really want to login
                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')              unlink($r->dir_config('lonIDsDir')."/$handle.id");
               .'</p>'          } else {
               .$end_page  # Indeed, a valid token is found
             );              &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
             return OK;      &Apache::loncommon::content_type($r,'text/html');
         }      $r->send_http_header;
     }      my $start_page =
           &Apache::loncommon::start_page('Already logged in');
 # ---------------------------------------------------- No valid token, continue      my $end_page =
           &Apache::loncommon::end_page();
               my $dest = '/adm/roles';
     my $buffer;              if ($env{'form.firsturl'} ne '') {
     if ($r->header_in('Content-length') > 0) {                  $dest = $env{'form.firsturl'};
  $r->read($buffer,$r->header_in('Content-length'),0);              }
     }              $r->print(
     my %form;                 $start_page
     foreach my $pair (split(/&/,$buffer)) {                .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
        my ($name,$value) = split(/=/,$pair);                .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
        $value =~ tr/+/ /;                      ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;                .'</p>'
        $form{$name}=$value;                .$end_page
     }              );
               return OK;
     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {          }
  &failed($r,'Username, password and domain need to be specified.',      }
  \%form);  
         return OK;  # ---------------------------------------------------- No valid token, continue
     }  
   
 # split user logging in and "su"-user      my $buffer;
       if ($r->header_in('Content-length') > 0) {
     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});   $r->read($buffer,$r->header_in('Content-length'),0);
     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});      }
     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});      my %form;
     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});      foreach my $pair (split(/&/,$buffer)) {
          my ($name,$value) = split(/=/,$pair);
     my $role   = $r->dir_config('lonRole');         $value =~ tr/+/ /;
     my $domain = $r->dir_config('lonDefDomain');         $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
     my $prodir = $r->dir_config('lonUsersDir');         $form{$name}=$value;
     my $contact_name = &mt('LON-CAPA helpdesk');      }
   
 # ---------------------------------------- Get the information from login token      if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
    &failed($r,'Username, password and domain need to be specified.',
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},   \%form);
                                       $form{'serverid'});          return OK;
       }
     my %sessiondata;  
     if ($form{'iptoken'}) {  # split user logging in and "su"-user
         %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});  
         my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});      ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
     }      $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
       $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||       $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
         ($tmpinfo eq 'no_such_host')) {  
  &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);      my $role   = $r->dir_config('lonRole');
         return OK;      my $domain = $r->dir_config('lonDefDomain');
     } else {      my $prodir = $r->dir_config('lonUsersDir');
  my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},      my $contact_name = &mt('LON-CAPA helpdesk');
    $form{'serverid'});  
         if ( $reply ne 'ok' ) {  # ---------------------------------------- Get the information from login token
             &failed($r,'Session could not be opened.',\%form);  
     &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");      my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
     return OK;                                        $form{'serverid'});
  }  
     }      if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
           ($tmpinfo eq 'no_such_host')) {
     if (!&Apache::lonnet::domain($form{'udom'})) {   &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);          return OK;
         return OK;      } else {
     }   my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
      $form{'serverid'});
     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);          if ( $reply ne 'ok' ) {
     if ($rolestr) {              &failed($r,'Session could not be opened.',\%form);
         $rolestr = &unescape($rolestr);      &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
     }      return OK;
     if ($symbstr) {   }
         $symbstr= &unescape($symbstr);      }
     }  
     if ($rolestr =~ /^role=/) {      if (!&Apache::lonnet::domain($form{'udom'})) {
         (undef,$form{'role'}) = split('=',$rolestr);          &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
     }          return OK;
     if ($symbstr =~ /^symb=/) {       }
         (undef,$form{'symb'}) = split('=',$symbstr);  
     }      my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
       if ($rolestr) {
     my $keybin=pack("H16",$key);          $rolestr = &unescape($rolestr);
       }
     my $cipher;      if ($symbstr) {
     if ($Crypt::DES::VERSION>=2.03) {          $symbstr= &unescape($symbstr);
  $cipher=new Crypt::DES $keybin;      }
     }      if ($iptokenstr) {
     else {          $iptokenstr = &unescape($iptokenstr);
  $cipher=new DES $keybin;      }
     }      if ($rolestr =~ /^role=/) {
     my $upass='';          (undef,$form{'role'}) = split('=',$rolestr);
     for (my $i=0;$i<=2;$i++) {      }
  my $chunk=      if ($symbstr =~ /^symb=/) {
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));          (undef,$form{'symb'}) = split('=',$symbstr);
       }
  $chunk.=      if ($iptokenstr =~ /^iptoken=/) {
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));          (undef,$form{'iptoken'}) = split('=',$iptokenstr);
       }
  $chunk=substr($chunk,1,ord(substr($chunk,0,1)));  
  $upass.=$chunk;      my $upass = $ENV{HTTPS} ? $form{'upass0'}
     }          : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
   
 # ---------------------------------------------------------------- Authenticate  # ---------------------------------------------------------------- Authenticate
   
     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});      my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
     my ($cancreate,$statustocreate) =      my ($cancreate,$statustocreate) =
         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});          &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
     my $defaultauth;      my $defaultauth;
     if (ref($cancreate) eq 'ARRAY') {      if (ref($cancreate) eq 'ARRAY') {
         if (grep(/^login$/,@{$cancreate})) {          if (grep(/^login$/,@{$cancreate})) {
             $defaultauth = 1;              $defaultauth = 1;
         }          }
     }      }
     my $clientcancheckhost = 1;      my $clientcancheckhost = 1;
     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,      my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
                                               $form{'udom'},$defaultauth,                                                $form{'udom'},$defaultauth,
                                               $clientcancheckhost);                                                $clientcancheckhost);
          
 # --------------------------------------------------------------------- Failed?  # --------------------------------------------------------------------- Failed?
   
     if ($authhost eq 'no_host') {      if ($authhost eq 'no_host') {
  &failed($r,'Username and/or password could not be authenticated.',   &failed($r,'Username and/or password could not be authenticated.',
  \%form);   \%form);
         return OK;          return OK;
     } elsif ($authhost eq 'no_account_on_host') {      } elsif ($authhost eq 'no_account_on_host') {
         if ($defaultauth) {          if ($defaultauth) {
             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');              my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {              unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
                 return OK;                  return OK;
             }              }
             my $start_page =               my $start_page =
                 &Apache::loncommon::start_page('Create a user account in LON-CAPA');                  &Apache::loncommon::start_page('Create a user account in LON-CAPA');
             my $lonhost = $r->dir_config('lonHostID');              my $lonhost = $r->dir_config('lonHostID');
             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};              my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
             my $contacts =               my $contacts =
                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',                  &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
                                                         $form{'udom'},$origmail);                                                          $form{'udom'},$origmail);
             my ($contact_email) = split(',',$contacts);               my ($contact_email) = split(',',$contacts);
             my $output =               my $output =
                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},                  &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
                                                        $domdesc,'',$lonhost,                                                         $domdesc,'',$lonhost,
                                                        $contact_email,$contact_name,                                                         $contact_email,$contact_name,
                                                        undef,$statustocreate);                                                         undef,$statustocreate);
             &Apache::loncommon::content_type($r,'text/html');              &Apache::loncommon::content_type($r,'text/html');
             $r->send_http_header;              $r->send_http_header;
             &Apache::createaccount::print_header($r,$start_page);              &Apache::createaccount::print_header($r,$start_page);
             $r->print('<h3>'.&mt('Account creation').'</h3>'.              $r->print('<h3>'.&mt('Account creation').'</h3>'.
                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.                        &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
                       $output.&Apache::loncommon::end_page());                        $output.&Apache::loncommon::end_page());
             return OK;              return OK;
         } else {          } else {
             &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);              &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
             return OK;              return OK;
         }          }
     }      }
   
     if (($firsturl eq '') ||       if (($firsturl eq '') ||
  ($firsturl=~/^\/adm\/(logout|remote)/)) {   ($firsturl=~/^\/adm\/(logout|remote)/)) {
  $firsturl='/adm/roles';   $firsturl='/adm/roles';
     }      }
   
     my $hosthere;      my $hosthere;
     if ($form{'iptoken'}) {      if ($form{'iptoken'}) {
         if (($sessiondata{'domain'} eq $form{'udom'}) &&          my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
             ($sessiondata{'username'} eq $form{'uname'})) {          my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
             $hosthere = 1;          if (($sessiondata{'domain'} eq $form{'udom'}) &&
         }              ($sessiondata{'username'} eq $form{'uname'})) {
     }              $hosthere = 1;
           }
 # --------------------------------- Are we attempting to login as somebody else?      }
     if ($form{'suname'}) {  
 # ------------ see if the original user has enough privileges to pull this stunt  # --------------------------------- Are we attempting to login as somebody else?
  if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {      if ($form{'suname'}) {
 # ---------------------------------------------------- see if the su-user exists  # ------------ see if the original user has enough privileges to pull this stunt
     unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})   if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
  eq 'no_host') {  # ---------------------------------------------------- see if the su-user exists
  &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));      unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
 # ------------------------------ see if the su-user is not too highly privileged   eq 'no_host') {
  unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {   &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
 # -------------------------------------------------------- actually switch users  # ------------------------------ see if the su-user is not too highly privileged
     &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.   unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
  ' logging in as '.$form{'suname'});  # -------------------------------------------------------- actually switch users
     $form{'uname'}=$form{'suname'};      &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
  } else {   ' logging in as '.$form{'suname'});
     &Apache::lonnet::logthis('Attempted switch user to privileged user');      $form{'uname'}=$form{'suname'};
  }   } else {
     }      &Apache::lonnet::logthis('Attempted switch user to privileged user');
  } else {   }
     &Apache::lonnet::logthis('Non-privileged user attempting switch user');      }
  }   } else {
     }      &Apache::lonnet::logthis('Non-privileged user attempting switch user');
    }
     my ($is_balancer,$otherserver);      }
   
     unless ($hosthere) {      my ($is_balancer,$otherserver);
         ($is_balancer,$otherserver) =  
             &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});      unless ($hosthere) {
     }          ($is_balancer,$otherserver) =
               &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
     if ($is_balancer) {          if ($is_balancer) {
         if (!$otherserver) {               if ($otherserver eq '') {
             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});                  my $lowest_load;
         }                  ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
         if ($otherserver) {                  if ($lowest_load > 100) {
             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,                      $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$form{'udom'});
                      \%form);                  }
             my $switchto = '/adm/switchserver?otherserver='.$otherserver;              }
             if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {              if ($otherserver ne '') {
                 $switchto .= '&origurl='.$firsturl;                  my @hosts = &Apache::lonnet::current_machine_ids();
             }                  if (grep(/^\Q$otherserver\E$/,@hosts)) {
             if ($form{'role'}) {                      $hosthere = $otherserver;
                 $switchto .= '&role='.$form{'role'};                  }
             }              }
             if ($form{'symb'}) {          }
                 $switchto .= '&symb='.$form{'symb'};      }
             }  
             $r->internal_redirect($switchto);      if (($is_balancer) && (!$hosthere)) {
         } else {          if ($otherserver) {
             $r->print(&noswitch());              &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
         }                       \%form);
         return OK;              my $switchto = '/adm/switchserver?otherserver='.$otherserver;
     } else {              if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
         if (!&check_can_host($r,\%form,$authhost)) {                  $switchto .= '&origurl='.$firsturl;
             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});              }
             if ($otherserver) {              if ($form{'role'}) {
                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,                  $switchto .= '&role='.$form{'role'};
                          \%form);              }
                 my $switchto = '/adm/switchserver?otherserver='.$otherserver;              if ($form{'symb'}) {
                 if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {                  $switchto .= '&symb='.$form{'symb'};
                     $switchto .= '&origurl='.$firsturl;              }
                 }              $r->internal_redirect($switchto);
                 if ($form{'role'}) {          } else {
                     $switchto .= '&role='.$form{'role'};              $r->print(&noswitch());
                 }          }
                 if ($form{'symb'}) {          return OK;
                     $switchto .= '&symb='.$form{'symb'};      } else {
                 }          if (!&check_can_host($r,\%form,$authhost)) {
                 $r->internal_redirect($switchto);              my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
             } else {              if ($otherserver) {
                 $r->print(&noswitch());                  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
             }                           \%form);
             return OK;                  my $switchto = '/adm/switchserver?otherserver='.$otherserver;
         }                  if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                       $switchto .= '&origurl='.$firsturl;
 # ------------------------------------------------------- Do the load balancing                  }
                   if ($form{'role'}) {
 # ---------------------------------------------------------- Determine own load                      $switchto .= '&role='.$form{'role'};
         my $loadlim = $r->dir_config('lonLoadLim');                  }
         my $loadavg;                  if ($form{'symb'}) {
         {                      $switchto .= '&symb='.$form{'symb'};
             my $loadfile=Apache::File->new('/proc/loadavg');                  }
             $loadavg=<$loadfile>;                  $r->internal_redirect($switchto);
         }              } else {
         $loadavg =~ s/\s.*//g;                  $r->print(&noswitch());
         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);              }
         my $userloadpercent=&Apache::lonnet::userload();              return OK;
           }
 # ---------------------------------------------------------- Are we overloaded?  
         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {  # ------------------------------------------------------- Do the load balancing
             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});  
             if (!$unloaded) {  # ---------------------------------------------------------- Determine own load
                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});          my $loadlim = $r->dir_config('lonLoadLim');
             }          my $loadavg;
             if ($unloaded) {          {
                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',              my $loadfile=Apache::File->new('/proc/loadavg');
                          undef,\%form);              $loadavg=<$loadfile>;
                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);          }
                 return OK;          $loadavg =~ s/\s.*//g;
             }          my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
         }          my $userloadpercent=&Apache::lonnet::userload();
         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,  
                  \%form);  # ---------------------------------------------------------- Are we overloaded?
         return OK;          if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
     }              my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
 }              if (!$unloaded) {
                   ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
 sub check_can_host {              }
     my ($r,$form,$authhost,$domdesc) = @_;              if ($unloaded) {
     return unless (ref($form) eq 'HASH');                  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
     my $canhost = 1;                           undef,\%form);
     my $lonhost = $r->dir_config('lonHostID');                  $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
     my $udom = $form->{'udom'};                  return OK;
     my @intdoms;              }
     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);          }
     if (ref($internet_names) eq 'ARRAY') {          if (($is_balancer) && ($hosthere)) {
         @intdoms = @{$internet_names};              $form{'noloadbalance'} = $hosthere;
     }          }
     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');          &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);                   \%form);
     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {          return OK;
         my $machine_dom = &Apache::lonnet::host_domain($lonhost);      }
         my $hostname = &Apache::lonnet::hostname($lonhost);  }
         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);  
         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);  sub check_can_host {
         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);      my ($r,$form,$authhost,$domdesc) = @_;
         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);      return unless (ref($form) eq 'HASH');
         my $loncaparev;      my $canhost = 1;
         if ($authhost eq 'no_account_on_host') {      my $lonhost = $r->dir_config('lonHostID');
             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);      my $udom = $form->{'udom'};
         } else {      my @intdoms;
             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);      my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
         }      if (ref($internet_names) eq 'ARRAY') {
         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,          @intdoms = @{$internet_names};
                                                      $udomdefaults{'remotesessions'},      }
                                                      $defdomdefaults{'hostedsessions'});      my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
     }      my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
     unless ($canhost) {      unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
         if ($authhost eq 'no_account_on_host') {          my $machine_dom = &Apache::lonnet::host_domain($lonhost);
             my $checkloginvia = 1;          my $hostname = &Apache::lonnet::hostname($lonhost);
             my ($login_host,$hostname) =           my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
                 &Apache::lonnet::choose_server($udom,$checkloginvia);          my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
             &Apache::loncommon::content_type($r,'text/html');          my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
             $r->send_http_header;          my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
             if ($login_host ne '') {          my $loncaparev;
                 my $protocol = $Apache::lonnet::protocol{$login_host};          if ($authhost eq 'no_account_on_host') {
                 $protocol = 'http' if ($protocol ne 'https');              $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';          } else {
                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').              $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
                           '<h3>'.&mt('Account creation').'</h3>'.          }
                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.          $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.                                                       $udomdefaults{'remotesessions'},
                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').                                                       $defdomdefaults{'hostedsessions'});
                           &Apache::loncommon::end_page());      }
             } else {      unless ($canhost) {
                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').          if ($authhost eq 'no_account_on_host') {
                           '<h3>'.&mt('Account creation unavailable').'</h3>'.              my $checkloginvia = 1;
                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.              my ($login_host,$hostname) =
                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.                  &Apache::lonnet::choose_server($udom,$checkloginvia);
                           &Apache::loncommon::end_page());              &Apache::loncommon::content_type($r,'text/html');
             }              $r->send_http_header;
         } else {              if ($login_host ne '') {
             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,                  my $protocol = $Apache::lonnet::protocol{$login_host};
                      $form);                  $protocol = 'http' if ($protocol ne 'https');
             my ($otherserver) = &Apache::lonnet::choose_server($udom);                  my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);                  $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
         }                            '<h3>'.&mt('Account creation').'</h3>'.
     }                            &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
     return $canhost;                            '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
 }                            '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
                             &Apache::loncommon::end_page());
 sub noswitch {              } else {
     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').                  $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                  '<h3>'.&mt('Session unavailable').'</h3>'.                            '<h3>'.&mt('Account creation unavailable').'</h3>'.
                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.                            &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.                            '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
                  &Apache::loncommon::end_page();                            &Apache::loncommon::end_page());
     return $result;              }
 }          } else {
               &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
 sub loginhelpdisplay {                       $form);
     my ($authdomain) = @_;              my ($otherserver) = &Apache::lonnet::choose_server($udom);
     my $login_help = 1;              $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
     my $lang = &Apache::lonlocal::current_language();          }
     if ($login_help) {      }
         my $dom = $authdomain;      return $canhost;
         if ($dom eq '') {  }
             $dom = &Apache::lonnet::default_login_domain();  
         }  sub noswitch {
         my %domconfhash = &Apache::loncommon::get_domainconf($dom);      my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
         my $loginhelp_url;                   '<h3>'.&mt('Session unavailable').'</h3>'.
         if ($lang) {                   &mt('This LON-CAPA server is unable to host your session.').'<br />'.
             $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};                   '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
             if ($loginhelp_url ne '') {                   &Apache::loncommon::end_page();
                 return $loginhelp_url;      return $result;
             }  }
         }  
         $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};  sub loginhelpdisplay {
         if ($loginhelp_url ne '') {      my ($authdomain) = @_;
             return $loginhelp_url;      my $login_help = 1;
         } else {      my $lang = &Apache::lonlocal::current_language();
             return '/adm/loginproblems.html';      if ($login_help) {
         }          my $dom = $authdomain;
     }          if ($dom eq '') {
     return;              $dom = &Apache::lonnet::default_login_domain();
 }          }
           my %domconfhash = &Apache::loncommon::get_domainconf($dom);
 1;          my $loginhelp_url;
 __END__          if ($lang) {
               $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
               if ($loginhelp_url ne '') {
                   return $loginhelp_url;
               }
           }
           $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
           if ($loginhelp_url ne '') {
               return $loginhelp_url;
           } else {
               return '/adm/loginproblems.html';
           }
       }
       return;
   }
   
   1;
   __END__
   
   
Removed from v.1.134  
changed lines
  Added in v.1.142

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