# The LearningOnline Network
# Login Screen
#
# $Id: lonlogin.pm,v 1.54 2003/09/21 20:06:36 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14,
# 1/14/00,5/29,5/30,6/1,6/29,7/1,11/9,
# 1/17/01 Gerd Kortemeyer
#
# 2/7/02,2/8,2/12,2/14,2/15,2/19 Josh Brunskole
#
# 7/10/02 Jeremy Bowers
package Apache::lonlogin;
use strict;
use Apache::Constants qw(:common);
use Apache::File ();
use Apache::lonnet();
use Apache::loncommon();
use Apache::lonauth();
use Apache::lonlocal;
sub handler {
my $r = shift;
&Apache::loncommon::no_cache($r);
&Apache::lonlocal::get_language_handle($r);
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
return OK if $r->header_only;
# Are we re-routing?
if (-e '/home/httpd/html/lon-status/reroute.txt') {
&Apache::lonauth::reroute($r);
return OK;
}
&Apache::loncommon::get_unprocessed_cgi
($ENV{'QUERY_STRING'}.'&'.$ENV{'request.querystring'},
['interface','username','domain','firsturl','localpath','localres']);
# ----------------------------------------------------------- Process Interface
$ENV{'form.interface'}=~s/\W//g;
my $textbrowsers=$r->dir_config('lonTextBrowsers');
my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
foreach (split(/\:/,$textbrowsers)) {
if ($httpbrowser=~/$_/i) {
$ENV{'form.interface'}='textual';
}
}
my $fullgraph=($ENV{'form.interface'} ne 'textual');
my $port_to_use=$r->dir_config('lonhttpdPort');
if (!defined($port_to_use)) {
$port_to_use='8080';
}
my $iconpath= 'http://'.$ENV{'HTTP_HOST'}.':'.$port_to_use.
$r->dir_config('lonIconsURL');
my $domain = $r->dir_config('lonDefDomain');
if (($ENV{'form.domain'}) &&
($Apache::lonnet::domaindescription{$ENV{'form.domain'}})) {
$domain=$ENV{'form.domain'};
}
my $role = $r->dir_config('lonRole');
my $loadlim = $r->dir_config('lonLoadLim');
my $servadm = $r->dir_config('lonAdmEMail');
my $sysadm = $r->dir_config('lonSysEMail');
my $lonhost = $r->dir_config('lonHostID');
my $tabdir = $r->dir_config('lonTabDir');
my $include = $r->dir_config('lonIncludes');
my $expire = $r->dir_config('lonExpire');
my $version = $r->dir_config('lonVersion');
# --------------------------------------------- Default values for login fields
my $authusername=($ENV{'form.username'}?$ENV{'form.username'}:'');
my $authdomain=($ENV{'form.domain'}?$ENV{'form.domain'}:$domain);
# ---------------------------------------------------------- Determine own load
my $loadavg;
{
my $loadfile=Apache::File->new('/proc/loadavg');
$loadavg=<$loadfile>;
}
$loadavg =~ s/\s.*//g;
my $loadpercent=100*$loadavg/$loadlim;
my $userloadpercent=&Apache::lonnet::userload();
# ------------------------------------------------------- Do the load balancing
my $otherserver='http://'.$ENV{'SERVER_NAME'};
my $firsturl=
($ENV{'request.firsturl'}?$ENV{'request.firsturl'}:$ENV{'form.firsturl'});
# ---------------------------------------- Are we access server and overloaded?
if (($role eq 'access') &&
(($userloadpercent>100.0)||($loadpercent>100.0))) {
my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent);
if ($unloaded) { $otherserver=$unloaded; }
}
# ----------------------------------------------------------- Get announcements
my $announcements=&Apache::lonnet::getannounce();
# -------------------------------------------------------- Set login parameters
my @hexstr=('0','1','2','3','4','5','6','7',
'8','9','a','b','c','d','e','f');
my $lkey='';
for (0..7) {
$lkey.=$hexstr[rand(15)];
}
my $ukey='';
for (0..7) {
$ukey.=$hexstr[rand(15)];
}
my $lextkey=hex($lkey);
if ($lextkey>2147483647) { $lextkey-=4294967296; }
my $uextkey=hex($ukey);
if ($uextkey>2147483647) { $uextkey-=4294967296; }
# -------------------------------------------------------- Store away log token
my $logtoken=Apache::lonnet::reply(
'tmpput:'.$ukey.$lkey.'&'.$firsturl,
$lonhost);
# ------------------- If we cannot talk to ourselves, we are in serious trouble
if ($logtoken eq 'con_lost') {
my $spares='';
foreach (keys %Apache::lonnet::hostname) {
if ($_ ne $lonhost) {
$spares.=' '.
$Apache::lonnet::hostname{$_}.'';
if ($Apache::lonnet::spareid{$_}) {
$spares.=' (preferred)';
}
}
}
$r->print(<The LearningOnline Network with CAPA
This LON-CAPA server is temporarily not available for login
Please attempt to login to one of the following servers: