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Diff for /loncom/auth/lonauth.pm between versions 1.121.2.10 and 1.142

version 1.121.2.10, 2014/04/06 13:52:36 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 $windowinfo=&Apache::lonmenu::open($env{'browser.os'});      my $brcrum = [{'href' => '',
     my $startupremote=&Apache::lonmenu::startupremote($destination);                     'text' => 'Successful Login'},];
     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);      my $args = {'bread_crumbs' => $brcrum,};
     my $setflags=&Apache::lonmenu::setflags();      unless ((defined($form->{role})) || (defined($form->{symb}))) {
     my $maincall=&Apache::lonmenu::maincall();          my $update=$env{'user.update.time'};
     my $brcrum = [{'href' => '',          if (!$update) {
                    'text' => 'Successful Login'},];              $update = $env{'user.login.time'};
     my $start_page=&Apache::loncommon::start_page('Successful Login',          }
                                                   $startupremote,          my %roles_in_env;
                                                   {'no_inline_link' => 1,          my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
                                                    'bread_crumbs' => $brcrum,});          if ($showcount == 1) {
     my $end_page  =&Apache::loncommon::end_page();              foreach my $rolecode (keys(%roles_in_env)) {
                   my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
     my $continuelink;                  if ($cid) {
     if ($env{'environment.remote'} eq 'off') {                      my %coursedescription =
  $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';                          &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
     }                      if ($coursedescription{'type'} eq 'Placement') {
 # ------------------------------------------------- Output for successful login                          $args->{'crstype'} = 'Placement';
                       }
     &Apache::loncommon::content_type($r,'text/html');                      last;
     $r->header_out('Set-cookie' => $cookie);                  }
     $r->send_http_header;              }
           }
     my %lt=&Apache::lonlocal::texthash(      }
        'wel' => 'Welcome',      my $start_page=&Apache::loncommon::start_page('Successful Login',
        'pro' => 'Login problems?',                                                    $header,$args);
        );      my $end_page  =&Apache::loncommon::end_page();
     my $loginhelp = &loginhelpdisplay($domain);  
     if ($loginhelp) {   my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
         $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';  # ------------------------------------------------- Output for successful login
     }  
       &Apache::loncommon::content_type($r,'text/html');
     my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');       $r->header_out('Set-cookie' => $cookie);
     $r->print(<<ENDSUCCESS);      $r->send_http_header;
 $start_page  
 $setflags      my %lt=&Apache::lonlocal::texthash(
 $windowinfo         'wel' => 'Welcome',
 <h1>$lt{'wel'}</h1>         'pro' => 'Login problems?',
 $welcome         );
 $loginhelp      my $loginhelp = &loginhelpdisplay($domain);
 $remoteinfo      if ($loginhelp) {
 $maincall          $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
 $continuelink      }
 $end_page  
 ENDSUCCESS      my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
 }      $r->print(<<ENDSUCCESS);
   $start_page
 # --------------------------------------------------------------- Failed login!  $windowinfo
   <h1>$lt{'wel'}</h1>
 sub failed {  $welcome
     my ($r,$message,$form) = @_;  $loginhelp
     (undef,undef,undef,my $clientmathml,my $clientunicode) =  $continuelink
         &Apache::loncommon::decode_user_agent();  $end_page
     my $args = {};  ENDSUCCESS
     if ($clientunicode && !$clientmathml) {      return;
         $args = {'browser.unicode' => 1};  }
     }  
   # --------------------------------------------------------------- Failed login!
     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);  
     my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});  sub failed {
     my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});      my ($r,$message,$form) = @_;
     if (&Apache::lonnet::domain($udom,'description') eq '') {      (undef,undef,undef,my $clientmathml,my $clientunicode) =
         undef($udom);          &Apache::loncommon::decode_user_agent();
     }      my $args = {};
     my $retry = '/adm/login';      if ($clientunicode && !$clientmathml) {
     if ($uname eq $form->{'uname'}) {          $args = {'browser.unicode' => 1};
         $retry .= '?username='.$uname;      }
     }  
     if ($udom) {      my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
         $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
     }      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
     if (exists($form->{role})) {      if (&Apache::lonnet::domain($udom,'description') eq '') {
         my $role = &Apache::loncommon::cleanup_html($form->{role});          undef($udom);
         if ($role ne '') {      }
             $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;      my $retry = '/adm/login';
         }      if ($uname eq $form->{'uname'}) {
     }          $retry .= '?username='.$uname;
     if (exists($form->{symb})) {      }
         my $symb = &Apache::loncommon::cleanup_html($form->{symb});      if ($udom) {
         if ($symb ne '') {          $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
             $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;      }
         }      if (exists($form->{role})) {
     }          my $role = &Apache::loncommon::cleanup_html($form->{role});
     my $end_page = &Apache::loncommon::end_page();          if ($role ne '') {
     &Apache::loncommon::content_type($r,'text/html');              $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
     $r->send_http_header;          }
     my @actions =      }
          (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));      if (exists($form->{symb})) {
     my $loginhelp = &loginhelpdisplay($udom);          my $symb = &Apache::loncommon::cleanup_html($form->{symb});
     if ($loginhelp) {          if ($symb ne '') {
         push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
     }          }
     #FIXME: link to helpdesk might be added here      }
       my $end_page = &Apache::loncommon::end_page();
     $r->print(      &Apache::loncommon::content_type($r,'text/html');
        $start_page      $r->send_http_header;
       .'<h2>'.&mt('Sorry ...').'</h2>'      my @actions =
       .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'           (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
       .&Apache::lonhtmlcommon::actionbox(\@actions)      my $loginhelp = &loginhelpdisplay($udom);
       .$end_page      if ($loginhelp) {
     );          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
  }      }
       #FIXME: link to helpdesk might be added here
 # ------------------------------------------------------------------ Rerouting!  
       $r->print(
 sub reroute {         $start_page
     my ($r) = @_;        .'<h2>'.&mt('Sorry ...').'</h2>'
     &Apache::loncommon::content_type($r,'text/html');        .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
     $r->send_http_header;        .&Apache::lonhtmlcommon::actionbox(\@actions)
     my $msg='<b>'.&mt('Sorry ...').'</b><br />'        .$end_page
            .&mt('Please [_1]log in again[_2].');      );
     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});   }
 }  
   # ------------------------------------------------------------------ Rerouting!
 # ---------------------------------------------------------------- Main handler  
   sub reroute {
 sub handler {      my ($r) = @_;
     my $r = shift;      &Apache::loncommon::content_type($r,'text/html');
     my $londocroot = $r->dir_config('lonDocRoot');      $r->send_http_header;
     my $form;      my $msg='<b>'.&mt('Sorry ...').'</b><br />'
 # Are we re-routing?             .&mt('Please [_1]log in again[_2].');
     if (-e "$londocroot/lon-status/reroute.txt") {      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
  &reroute($r);  }
  return OK;  
     }  # ---------------------------------------------------------------- Main handler
   
     &Apache::lonlocal::get_language_handle($r);  sub handler {
       my $r = shift;
 # -------------------------------- Prevent users from attempting to login twice      my $londocroot = $r->dir_config('lonDocRoot');
     my $handle = &Apache::lonnet::check_for_valid_session($r);  # Are we re-routing?
     if ($handle ne '') {      if (-e "$londocroot/lon-status/reroute.txt") {
         my $lonidsdir=$r->dir_config('lonIDsDir');   &reroute($r);
         if ($handle=~/^publicuser\_/) {   return OK;
 # For "public user" - remove it, we apparently really want to login      }
             unlink($r->dir_config('lonIDsDir')."/$handle.id");  
         } else {      &Apache::lonlocal::get_language_handle($r);
 # Indeed, a valid token is found  
             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);  # -------------------------------- Prevent users from attempting to login twice
     &Apache::loncommon::content_type($r,'text/html');      my $handle = &Apache::lonnet::check_for_valid_session($r);
     $r->send_http_header;      if ($handle ne '') {
     my $start_page =           my $lonidsdir=$r->dir_config('lonIDsDir');
         &Apache::loncommon::start_page('Already logged in');          if ($handle=~/^publicuser\_/) {
     my $end_page =   # For "public user" - remove it, we apparently really want to login
         &Apache::loncommon::end_page();              unlink($r->dir_config('lonIDsDir')."/$handle.id");
             my $dest = '/adm/roles';          } else {
             if ($env{'form.firsturl'} ne '') {  # Indeed, a valid token is found
                 $dest = $env{'form.firsturl'};              &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
             }      &Apache::loncommon::content_type($r,'text/html');
             $r->print(      $r->send_http_header;
                $start_page      my $start_page =
               .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'          &Apache::loncommon::start_page('Already logged in');
               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'      my $end_page =
                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')          &Apache::loncommon::end_page();
               .'</p>'              my $dest = '/adm/roles';
               .$end_page              if ($env{'form.firsturl'} ne '') {
             );                  $dest = $env{'form.firsturl'};
             return OK;              }
         }              $r->print(
     }                 $start_page
                 .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
 # ---------------------------------------------------- No valid token, continue                .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
                       ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
                 .'</p>'
     my $buffer;                .$end_page
     if ($r->header_in('Content-length') > 0) {              );
  $r->read($buffer,$r->header_in('Content-length'),0);              return OK;
     }          }
     my %form;      }
     foreach my $pair (split(/&/,$buffer)) {  
        my ($name,$value) = split(/=/,$pair);  # ---------------------------------------------------- No valid token, continue
        $value =~ tr/+/ /;  
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;  
        $form{$name}=$value;      my $buffer;
     }      if ($r->header_in('Content-length') > 0) {
    $r->read($buffer,$r->header_in('Content-length'),0);
     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {      }
  &failed($r,'Username, password and domain need to be specified.',      my %form;
  \%form);      foreach my $pair (split(/&/,$buffer)) {
         return OK;         my ($name,$value) = split(/=/,$pair);
     }         $value =~ tr/+/ /;
          $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
 # split user logging in and "su"-user         $form{$name}=$value;
       }
     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});  
     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});      if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});   &failed($r,'Username, password and domain need to be specified.',
     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});   \%form);
           return OK;
     my $role   = $r->dir_config('lonRole');      }
     my $domain = $r->dir_config('lonDefDomain');  
     my $prodir = $r->dir_config('lonUsersDir');  # split user logging in and "su"-user
     my $contact_name = &mt('LON-CAPA helpdesk');  
       ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
 # ---------------------------------------- Get the information from login token      $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
       $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},      $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
                                       $form{'serverid'});  
       my $role   = $r->dir_config('lonRole');
     my %sessiondata;      my $domain = $r->dir_config('lonDefDomain');
     if ($form{'iptoken'}) {      my $prodir = $r->dir_config('lonUsersDir');
         %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});      my $contact_name = &mt('LON-CAPA helpdesk');
         my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});  
     }  # ---------------------------------------- Get the information from login token
   
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||       my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
         ($tmpinfo eq 'no_such_host')) {                                        $form{'serverid'});
  &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);  
         return OK;      if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
     } else {          ($tmpinfo eq 'no_such_host')) {
  my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},   &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
    $form{'serverid'});          return OK;
         if ( $reply ne 'ok' ) {      } else {
             &failed($r,'Session could not be opened.',\%form);   my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
     &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");     $form{'serverid'});
     return OK;          if ( $reply ne 'ok' ) {
  }              &failed($r,'Session could not be opened.',\%form);
     }      &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
       return OK;
     if (!&Apache::lonnet::domain($form{'udom'})) {   }
         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);      }
         return OK;  
     }      if (!&Apache::lonnet::domain($form{'udom'})) {
           &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);          return OK;
     if ($rolestr) {      }
         $rolestr = &unescape($rolestr);  
     }      my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
     if ($symbstr) {      if ($rolestr) {
         $symbstr= &unescape($symbstr);          $rolestr = &unescape($rolestr);
     }      }
     if ($rolestr =~ /^role=/) {      if ($symbstr) {
         (undef,$form{'role'}) = split('=',$rolestr);          $symbstr= &unescape($symbstr);
     }      }
     if ($symbstr =~ /^symb=/) {       if ($iptokenstr) {
         (undef,$form{'symb'}) = split('=',$symbstr);          $iptokenstr = &unescape($iptokenstr);
     }      }
       if ($rolestr =~ /^role=/) {
     my $keybin=pack("H16",$key);          (undef,$form{'role'}) = split('=',$rolestr);
       }
     my $cipher;      if ($symbstr =~ /^symb=/) {
     if ($Crypt::DES::VERSION>=2.03) {          (undef,$form{'symb'}) = split('=',$symbstr);
  $cipher=new Crypt::DES $keybin;      }
     }      if ($iptokenstr =~ /^iptoken=/) {
     else {          (undef,$form{'iptoken'}) = split('=',$iptokenstr);
  $cipher=new DES $keybin;      }
     }  
     my $upass='';      my $upass = $ENV{HTTPS} ? $form{'upass0'}
     for (my $i=0;$i<=2;$i++) {          : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
  my $chunk=  
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));  # ---------------------------------------------------------------- Authenticate
   
  $chunk.=      my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));      my ($cancreate,$statustocreate) =
           &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
  $chunk=substr($chunk,1,ord(substr($chunk,0,1)));      my $defaultauth;
  $upass.=$chunk;      if (ref($cancreate) eq 'ARRAY') {
     }          if (grep(/^login$/,@{$cancreate})) {
               $defaultauth = 1;
 # ---------------------------------------------------------------- Authenticate          }
       }
     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});      my $clientcancheckhost = 1;
     my ($cancreate,$statustocreate) =      my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});                                                $form{'udom'},$defaultauth,
     my $defaultauth;                                                $clientcancheckhost);
     if (ref($cancreate) eq 'ARRAY') {     
         if (grep(/^login$/,@{$cancreate})) {  # --------------------------------------------------------------------- Failed?
             $defaultauth = 1;  
         }      if ($authhost eq 'no_host') {
     }   &failed($r,'Username and/or password could not be authenticated.',
     my $clientcancheckhost = 1;   \%form);
     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,          return OK;
                                               $form{'udom'},$defaultauth,      } elsif ($authhost eq 'no_account_on_host') {
                                               $clientcancheckhost);          if ($defaultauth) {
                   my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
 # --------------------------------------------------------------------- Failed?              unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
                   return OK;
     if ($authhost eq 'no_host') {              }
  &failed($r,'Username and/or password could not be authenticated.',              my $start_page =
  \%form);                  &Apache::loncommon::start_page('Create a user account in LON-CAPA');
         return OK;              my $lonhost = $r->dir_config('lonHostID');
     } elsif ($authhost eq 'no_account_on_host') {              my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
         if ($defaultauth) {              my $contacts =
             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');                  &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {                                                          $form{'udom'},$origmail);
                 return OK;              my ($contact_email) = split(',',$contacts);
             }              my $output =
             my $start_page =                   &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
                 &Apache::loncommon::start_page('Create a user account in LON-CAPA',                                                         $domdesc,'',$lonhost,
                                                '',{'no_inline_link'   => 1,});                                                         $contact_email,$contact_name,
             my $lonhost = $r->dir_config('lonHostID');                                                         undef,$statustocreate);
             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};              &Apache::loncommon::content_type($r,'text/html');
             my $contacts =               $r->send_http_header;
                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',              &Apache::createaccount::print_header($r,$start_page);
                                                         $form{'udom'},$origmail);              $r->print('<h3>'.&mt('Account creation').'</h3>'.
             my ($contact_email) = split(',',$contacts);                         &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
             my $output =                         $output.&Apache::loncommon::end_page());
                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},              return OK;
                                                        $domdesc,'',$lonhost,          } else {
                                                        $contact_email,$contact_name,              &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
                                                        undef,$statustocreate);              return OK;
             &Apache::loncommon::content_type($r,'text/html');          }
             $r->send_http_header;      }
             &Apache::createaccount::print_header($r,$start_page);  
             $r->print('<h3>'.&mt('Account creation').'</h3>'.      if (($firsturl eq '') ||
                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.   ($firsturl=~/^\/adm\/(logout|remote)/)) {
                       $output.&Apache::loncommon::end_page());   $firsturl='/adm/roles';
             return OK;      }
         } else {  
             &failed($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);      my $hosthere;
             return OK;      if ($form{'iptoken'}) {
         }          my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
     }          my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
           if (($sessiondata{'domain'} eq $form{'udom'}) &&
     if (($firsturl eq '') ||               ($sessiondata{'username'} eq $form{'uname'})) {
  ($firsturl=~/^\/adm\/(logout|remote)/)) {              $hosthere = 1;
  $firsturl='/adm/roles';          }
     }      }
   
     my $hosthere;  # --------------------------------- Are we attempting to login as somebody else?
     if ($form{'iptoken'}) {      if ($form{'suname'}) {
         if (($sessiondata{'domain'} eq $form{'udom'}) &&  # ------------ see if the original user has enough privileges to pull this stunt
             ($sessiondata{'username'} eq $form{'uname'})) {   if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
             $hosthere = 1;  # ---------------------------------------------------- see if the su-user exists
         }      unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
     }   eq 'no_host') {
    &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
 # --------------------------------- Are we attempting to login as somebody else?  # ------------------------------ see if the su-user is not too highly privileged
     if ($form{'suname'}) {   unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
 # ------------ see if the original user has enough privileges to pull this stunt  # -------------------------------------------------------- actually switch users
  if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {      &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
 # ---------------------------------------------------- see if the su-user exists   ' logging in as '.$form{'suname'});
     unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})      $form{'uname'}=$form{'suname'};
  eq 'no_host') {   } else {
  &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));      &Apache::lonnet::logthis('Attempted switch user to privileged user');
 # ------------------------------ see if the su-user is not too highly privileged   }
  unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {      }
 # -------------------------------------------------------- actually switch users   } else {
     &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.      &Apache::lonnet::logthis('Non-privileged user attempting switch user');
  ' logging in as '.$form{'suname'});   }
     $form{'uname'}=$form{'suname'};      }
  } else {  
     &Apache::lonnet::logthis('Attempted switch user to privileged user');      my ($is_balancer,$otherserver);
  }  
     }      unless ($hosthere) {
  } else {          ($is_balancer,$otherserver) =
     &Apache::lonnet::logthis('Non-privileged user attempting switch user');              &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
  }          if ($is_balancer) {
     }              if ($otherserver eq '') {
                   my $lowest_load;
     my ($is_balancer,$otherserver);                  ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
                   if ($lowest_load > 100) {
     unless ($hosthere) {                      $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$form{'udom'});
         ($is_balancer,$otherserver) =                  }
             &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});              }
     }              if ($otherserver ne '') {
                   my @hosts = &Apache::lonnet::current_machine_ids();
     if ($is_balancer) {                  if (grep(/^\Q$otherserver\E$/,@hosts)) {
         if (!$otherserver) {                       $hosthere = $otherserver;
             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});                  }
         }              }
         if ($otherserver) {          }
             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,      }
                      \%form);  
             my $switchto = '/adm/switchserver?otherserver='.$otherserver;      if (($is_balancer) && (!$hosthere)) {
             if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {          if ($otherserver) {
                 $switchto .= '&origurl='.$firsturl;              &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
             }                       \%form);
             if ($form{'role'}) {              my $switchto = '/adm/switchserver?otherserver='.$otherserver;
                 $switchto .= '&role='.$form{'role'};              if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
             }                  $switchto .= '&origurl='.$firsturl;
             if ($form{'symb'}) {              }
                 $switchto .= '&symb='.$form{'symb'};              if ($form{'role'}) {
             }                  $switchto .= '&role='.$form{'role'};
             $r->internal_redirect($switchto);              }
         } else {              if ($form{'symb'}) {
             $r->print(&noswitch());                  $switchto .= '&symb='.$form{'symb'};
         }              }
         return OK;              $r->internal_redirect($switchto);
     } else {          } else {
         if (!&check_can_host($r,\%form,$authhost)) {              $r->print(&noswitch());
             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});          }
             if ($otherserver) {          return OK;
                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,      } else {
                          \%form);          if (!&check_can_host($r,\%form,$authhost)) {
                 my $switchto = '/adm/switchserver?otherserver='.$otherserver;              my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
                 if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {              if ($otherserver) {
                     $switchto .= '&origurl='.$firsturl;                  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                 }                           \%form);
                 if ($form{'role'}) {                  my $switchto = '/adm/switchserver?otherserver='.$otherserver;
                     $switchto .= '&role='.$form{'role'};                  if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                 }                      $switchto .= '&origurl='.$firsturl;
                 if ($form{'symb'}) {                  }
                     $switchto .= '&symb='.$form{'symb'};                  if ($form{'role'}) {
                 }                      $switchto .= '&role='.$form{'role'};
                 $r->internal_redirect($switchto);                  }
             } else {                  if ($form{'symb'}) {
                 $r->print(&noswitch());                      $switchto .= '&symb='.$form{'symb'};
             }                  }
             return OK;                  $r->internal_redirect($switchto);
         }              } else {
                   $r->print(&noswitch());
 # ------------------------------------------------------- Do the load balancing              }
               return OK;
 # ---------------------------------------------------------- Determine own load          }
         my $loadlim = $r->dir_config('lonLoadLim');  
         my $loadavg;  # ------------------------------------------------------- Do the load balancing
         {  
             my $loadfile=Apache::File->new('/proc/loadavg');  # ---------------------------------------------------------- Determine own load
             $loadavg=<$loadfile>;          my $loadlim = $r->dir_config('lonLoadLim');
         }          my $loadavg;
         $loadavg =~ s/\s.*//g;          {
         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);              my $loadfile=Apache::File->new('/proc/loadavg');
         my $userloadpercent=&Apache::lonnet::userload();              $loadavg=<$loadfile>;
           }
 # ---------------------------------------------------------- Are we overloaded?          $loadavg =~ s/\s.*//g;
         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {          my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});          my $userloadpercent=&Apache::lonnet::userload();
             if (!$unloaded) {  
                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});  # ---------------------------------------------------------- Are we overloaded?
             }          if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
             if ($unloaded) {              my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',              if (!$unloaded) {
                          undef,\%form);                  ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);              }
                 return OK;              if ($unloaded) {
             }                  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
         }                           undef,\%form);
         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,                  $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
                  \%form);                  return OK;
         return OK;              }
     }          }
 }          if (($is_balancer) && ($hosthere)) {
               $form{'noloadbalance'} = $hosthere;
 sub check_can_host {          }
     my ($r,$form,$authhost,$domdesc) = @_;          &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
     return unless (ref($form) eq 'HASH');                   \%form);
     my $canhost = 1;          return OK;
     my $lonhost = $r->dir_config('lonHostID');      }
     my $udom = $form->{'udom'};  }
     my @intdoms;  
     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);  sub check_can_host {
     if (ref($internet_names) eq 'ARRAY') {      my ($r,$form,$authhost,$domdesc) = @_;
         @intdoms = @{$internet_names};      return unless (ref($form) eq 'HASH');
     }      my $canhost = 1;
     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');      my $lonhost = $r->dir_config('lonHostID');
     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);      my $udom = $form->{'udom'};
     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {      my @intdoms;
         my $machine_dom = &Apache::lonnet::host_domain($lonhost);      my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
         my $hostname = &Apache::lonnet::hostname($lonhost);      if (ref($internet_names) eq 'ARRAY') {
         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);          @intdoms = @{$internet_names};
         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);      }
         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);      my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);      my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
         my $loncaparev;      unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
         if ($authhost eq 'no_account_on_host') {          my $machine_dom = &Apache::lonnet::host_domain($lonhost);
             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);          my $hostname = &Apache::lonnet::hostname($lonhost);
         } else {          my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);          my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
         }          my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,          my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
                                                      $udomdefaults{'remotesessions'},          my $loncaparev;
                                                      $defdomdefaults{'hostedsessions'});          if ($authhost eq 'no_account_on_host') {
     }              $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
     unless ($canhost) {          } else {
         if ($authhost eq 'no_account_on_host') {              $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
             my $checkloginvia = 1;          }
             my ($login_host,$hostname) =           $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                 &Apache::lonnet::choose_server($udom,$checkloginvia);                                                       $udomdefaults{'remotesessions'},
             &Apache::loncommon::content_type($r,'text/html');                                                       $defdomdefaults{'hostedsessions'});
             $r->send_http_header;      }
             if ($login_host ne '') {      unless ($canhost) {
                 my $protocol = $Apache::lonnet::protocol{$login_host};          if ($authhost eq 'no_account_on_host') {
                 $protocol = 'http' if ($protocol ne 'https');              my $checkloginvia = 1;
                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';              my ($login_host,$hostname) =
                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').                  &Apache::lonnet::choose_server($udom,$checkloginvia);
                           '<h3>'.&mt('Account creation').'</h3>'.              &Apache::loncommon::content_type($r,'text/html');
                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.              $r->send_http_header;
                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.              if ($login_host ne '') {
                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').                  my $protocol = $Apache::lonnet::protocol{$login_host};
                           &Apache::loncommon::end_page());                  $protocol = 'http' if ($protocol ne 'https');
             } else {                  my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').                  $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
                           '<h3>'.&mt('Account creation unavailable').'</h3>'.                            '<h3>'.&mt('Account creation').'</h3>'.
                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.                            &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.                            '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
                           &Apache::loncommon::end_page());                            '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
             }                            &Apache::loncommon::end_page());
         } else {              } else {
             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,                  $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                      $form);                            '<h3>'.&mt('Account creation unavailable').'</h3>'.
             my ($otherserver) = &Apache::lonnet::choose_server($udom);                            &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);                            '<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());
     }              }
     return $canhost;          } else {
 }              &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
                        $form);
 sub noswitch {              my ($otherserver) = &Apache::lonnet::choose_server($udom);
     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').              $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
                  '<h3>'.&mt('Session unavailable').'</h3>'.          }
                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.      }
                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.      return $canhost;
                  &Apache::loncommon::end_page();  }
     return $result;  
 }  sub noswitch {
       my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
 sub loginhelpdisplay {                   '<h3>'.&mt('Session unavailable').'</h3>'.
     my ($authdomain) = @_;                   &mt('This LON-CAPA server is unable to host your session.').'<br />'.
     my $login_help = 1;                   '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
     my $lang = &Apache::lonlocal::current_language();                   &Apache::loncommon::end_page();
     if ($login_help) {      return $result;
         my $dom = $authdomain;  }
         if ($dom eq '') {  
             $dom = &Apache::lonnet::default_login_domain();  sub loginhelpdisplay {
         }      my ($authdomain) = @_;
         my %domconfhash = &Apache::loncommon::get_domainconf($dom);      my $login_help = 1;
         my $loginhelp_url;      my $lang = &Apache::lonlocal::current_language();
         if ($lang) {      if ($login_help) {
             $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};          my $dom = $authdomain;
             if ($loginhelp_url ne '') {          if ($dom eq '') {
                 return $loginhelp_url;              $dom = &Apache::lonnet::default_login_domain();
             }          }
         }          my %domconfhash = &Apache::loncommon::get_domainconf($dom);
         $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};          my $loginhelp_url;
         if ($loginhelp_url ne '') {          if ($lang) {
             return $loginhelp_url;              $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
         } else {              if ($loginhelp_url ne '') {
             return '/adm/loginproblems.html';                  return $loginhelp_url;
         }              }
     }          }
     return;          $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
 }          if ($loginhelp_url ne '') {
               return $loginhelp_url;
 1;          } else {
 __END__              return '/adm/loginproblems.html';
           }
       }
       return;
   }
   
   1;
   __END__
   
   
Removed from v.1.121.2.10  
changed lines
  Added in v.1.142

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