# The LearningOnline Network
# Login Screen
#
# $Id: lonlogin.pm,v 1.34 2003/02/18 21:11:17 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();
sub handler {
my $r = shift;
$r->content_type('text/html');
&Apache::loncommon::no_cache($r);
$r->send_http_header;
return OK if $r->header_only;
&Apache::loncommon::get_unprocessed_cgi
($ENV{'QUERY_STRING'},['interface','username','domain','firsturl']);
# ----------------------------------------------------------- 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 $iconpath= 'http://'.$ENV{'HTTP_HOST'}.':8080'.
$r->dir_config('lonIconsURL');
my $domain = $r->dir_config('lonDefDomain');
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');
# --------------------------------------------- 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;
# ------------------------------------------------------- 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 (($role eq 'access') && ($loadpercent>100.0)) {
$otherserver=Apache::lonnet::spareserver($loadpercent);
}
# -------------------------------------------------------- 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:
$spares
If the problem persists, please contact $servadm.