[BACK]Return to takeoffline.pl CVS log [TXT] [DIR] Up to [LON-CAPA] / loncom / cgi
File:  [LON-CAPA] / loncom / cgi / takeoffline.pl
Revision 1.6.12.1: download - view: text, annotated - select for diffs
Wed Mar 11 03:33:22 2015 UTC (9 years, 2 months ago) by raeburn
Branches: version_2_11_X
CVS tags: version_2_11_4_uiuc, version_2_11_4_msu, version_2_11_4, version_2_11_3_uiuc, version_2_11_3_msu, version_2_11_3, version_2_11_2_uiuc, version_2_11_2_msu, version_2_11_2_educog, version_2_11_2, version_2_11_1
Diff to branchpoint 1.6: preferred, colored
- For 2.11
  Backport 1.8

#!/usr/bin/perl
$|=1;
# Take machine offline, reroute traffic
#
# $Id: takeoffline.pl,v 1.6.12.1 2015/03/11 03:33:22 raeburn 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/
#

use strict;
use lib '/home/httpd/lib/perl/';
use Apache::lonlocal;
use Apache::loncommon;
use Apache::lonnet;
use LONCAPA::loncgi;
use LONCAPA::lonauthcgi;

print "Content-type: text/html\n\n";

&main();

sub main {
    if (!&LONCAPA::lonauthcgi::check_ipbased_access('takeoffline')) {
        if (!&LONCAPA::loncgi::check_cookie_and_load_env()) {
            &Apache::lonlocal::get_language_handle();
            print(&LONCAPA::loncgi::missing_cookie_msg());
            return;
        }

        if (!&LONCAPA::lonauthcgi::can_view('takeoffline')) {
            &Apache::lonlocal::get_language_handle();
            print(&LONCAPA::lonauthcgi::unauthorized_msg('takeoffline'));
            return;
        }
    }
    &Apache::lonlocal::get_language_handle();

    if ($ENV{'QUERY_STRING'} =~ /^phase\=two\&?(.*)$/) {
        my $reroute = $1;
        print &Apache::loncommon::start_page('Take Offline','',
                                             {'no_inline_link'   => 1,});
        &phasetwo($reroute);
    } else {
        my $js = <<ENDJS;
<script type="text/javascript">
// <![CDATA[

function setphase(form) {
    var subaction = '/cgi-bin/takeoffline.pl?phase=two';
    form.action = subaction+'&'+form.rerouteto.options[form.rerouteto.selectedIndex].value;
    form.submit();
}

// ]]>
</script>
ENDJS
        print &Apache::loncommon::start_page('Take Offline',$js,
                                             {'no_inline_link'   => 1,});
        &phaseone();
    }
    print &Apache::loncommon::end_page();
    return;
}

sub phaseone {
    print '<h2>'.&Apache::lonlocal::mt('Take Offline').'</h2>';
    my ($is_dc,@okmachines,%servers);
    my @poss_domains = &Apache::lonnet::current_machine_domains();
    foreach my $dom (@poss_domains) {
        if ($Apache::lonnet::env{'request.role'} eq "dc./$dom/") {
            $is_dc = 1;
        }
        my %domconfig = &Apache::lonnet::get_dom('configuration',['serverstatuses'],$dom);
        if (ref($domconfig{'serverstatuses'}) eq 'HASH') {
            if (ref($domconfig{'serverstatuses'}{'takeonline'}) eq 'HASH') {
                if ($domconfig{'serverstatuses'}{'takeonline'}{'machines'} ne '') {
                    @okmachines = split(/,/,$domconfig{'serverstatuses'}{'takeonline'}{'machines'});
                }
            }
        }
        %{$servers{$dom}} = &Apache::lonnet::get_servers($dom);
    }
    my $ip = $ENV{'REMOTE_ADDR'};
    my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
    print '<p>'.&mt("When a LON-CAPA server is 'taken offline' using this utility, the standard log-in page will be replaced with one of the following:").'</p>'.
          '<ul><li>'.&mt('A page which automatically performs a redirect to another server in your domain - the server must be specified below.').'</li>'.
              '<li>'.&mt('A page which announces that this LON-CAPA server is offline.').'</li></ul>';
    print '<p>'.&mt("Once a server is offline, the [_1]'take online'[_2] utility can be used to reverse this, but you should verify that you will still be able to access that script once the server is in an offline state.",'<a href="/cgi-bin/takeonline.pl">','</a>').'</p>';
    print '<p>'.&mt("In common with other Domain Status pages the 'take online' script is accessible from certain IP addresses:").'</p><ul>'.
          '<li>'.&mt('The loopback device - 127.0.0.1 (localhost) - for times when you are web browsing from the server itself.').'</li>'.
          '<li>'.&mt("Specified IP addresses set via the configuration for [_1]Access to Server Status Pages[_2] for domain(s) hosted on the server.",'<a href="/adm/domainprefs?phase=display&amp;actions=serverstatuses">','</a>').'</li></ul><p>'.
          &mt("Once the server is offline you will not be able to log-in directly to select a Domain Coordinator role to use the 'Take online' script, unless IP-based controls provide your access.").'<br />'.&mt("However, you will be able to log-in to a different server in the LON-CAPA network, select a Domain Coordinator role in this server's domain, and then use: [_1] to migrate you session to this machine.","<br /><tt>/adm/switchserver?otherserver=$lonhost</tt>").'<br /></p><hr />';
    if ($ip eq '127.0.0.1') {
        print '<div class="LC_info">'.&mt('You are accessing this page from the loopback device.').'</div>';
    } elsif (!@okmachines) {
        print '<div class="LC_warning">'.&mt("IP-based access to the 'take online' page is currently unavailable, as no IP addresses have been specified.").'</div>';
    } elsif (!grep(/^\Q$ip\E$/,@okmachines)) {
        print '<div class="LC_warning">'.&mt("Your current IP [_1] is not among those configured to have IP-based access to the 'take online' utility.",$ip).'</div>';
    } else {
        print '<div class="LC_info">'.&mt("Your current IP [_1] is configured to have IP-based access to the 'take online' utility.",$ip).'</div>';
    }
    my (%allhosts,$otherserver,$domain);
    if ($ENV{'QUERY_STRING'}) {
        ($otherserver,$domain)=split(/\&/,$ENV{'QUERY_STRING'});
    }
    print '<hr /><form method="post" name="takeoffline" onsubmit="javascript:setphase(this);" action="">';

    my $options;
    if ($domain) {
        if (grep(/^\Q$domain\E$/,keys(%servers))) {
            if (ref($servers{$domain}) eq 'HASH') {
                foreach my $hostid (sort(keys(%{$servers{$domain}}))) {
                    next if ($hostid eq $lonhost);
                    my $selchk = '';
                    if ($otherserver eq $hostid) {
                        $selchk = ' selected="selected"';
                    }
                    $options .=
                        "<option value=\"$hostid&amp;$domain\"$selchk>$servers{$domain}{$hostid}</option>\n";
                }
            }
        }
    }
    foreach my $dom (sort(keys(%servers))) {
        next if (($domain) && ($dom eq $domain));
        if (ref($servers{$dom}) eq 'HASH') {
            foreach my $hostid (sort(keys(%{$servers{$dom}}))) {
                next if ($hostid eq $lonhost);
                next if(defined($allhosts{$hostid}));
                $allhosts{$hostid} = 1;
                my $selchk = '';
                if ($otherserver eq $hostid) {
                    $selchk = ' selected="selected"';
                }
                $options .=
                    "<option value=\"$hostid&amp;$dom\"$selchk>$servers{$dom}{$hostid}</option>\n";
            }
        }
    }
    if ($options) {
        print &mt('Optional: choose another server in your domain, to which to redirect log-ins: ').
              '<select name="rerouteto">'."\n".
              ' <option value="">'.&mt('Please select').'</option>'."\n".
              $options.'</select>'."\n";
    } else {
        print &mt('There are no other servers in your domain to which to redirect logins.');
    }
    print '<br /><br /><input type="submit" name="offline" value="Take Offline" />'."\n".
          '</form>'."\n";
}

sub phasetwo {
    my ($reroute) = @_;
    print '<h2>'.&Apache::lonlocal::mt('Take Offline').'</h2>';
    my $statusmsg;
    if ($reroute ne '') {
        my ($otherserver,$domain)=split(/\&/,$reroute);
        my $otherhostname = &reroute($otherserver,$domain);
        if ($otherhostname ne '') {
            print &Apache::lonlocal::mt('Rerouting to [_1]',$otherhostname);
            $statusmsg = "status=rerouting&server=$otherserver&domain=$domain&time=".time.
                         "by=$Apache::lonnet::env{'user.name'}:$Apache::lonnet::env{'user.domain'}";
        }
    } else {
        if (&dead()) {
            print &Apache::lonlocal::mt('No reroute server given, taking completely offline.');
            $statusmsg = 'status=offline&time='.time."by=$Apache::lonnet::env{'user.name'}:$Apache::lonnet::env{'user.domain'}"
        }
    }
    if ($statusmsg) {
        if (open (STATUS,'>/home/httpd/html/lon-status/reroute.txt')) {
            print STATUS "$statusmsg\n";
            close(STATUS);
        } else {
            print &Apache::lonlocal::mt('Logging of status change to [_1] failed.','<tt>/home/httpd/html/lon-status/reroute.txt</tt>'); 
        }
    }
}

sub dead {
    if (open (OUT,'>/home/httpd/html/index.html')) {
        print OUT &Apache::lonlocal::mt('This LON-CAPA server is currently offline.');
        close(OUT);
        return 'ok';
    }
    return;
}

sub reroute {
    my ($otherserver,$domain) = @_;
    my $otherhostname = &Apache::lonnet::hostname($otherserver);
    my $protocol = $Apache::lonnet::protocol{$otherserver};
    $protocol = 'http' if ($protocol ne 'https');
    if ($otherhostname ne '') {
        if (open (OUT,'>/home/httpd/html/index.html')) {
            print OUT (<<ENDNEWINDEX);
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
  <title>Welcome to the LearningOnline Network with CAPA</title>
  <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
  <meta http-equiv="refresh" content="0.5; url=$protocol://$otherhostname/adm/login?domain=$domain">
  <meta http-equiv="pragma" content="no-cache" />
 </head>
 <body style="background-color:#004400; margin: 0px;">
  <img src="/adm/lonIcons/header.gif" alt="loncapa banner" />
<p style="color:#ffffff">Connecting to 
<a href="$protocol://$otherhostname/adm/login?domain=$domain" style="color:#ffffff">$protocol://$otherhostname/</a></p>
</body>
</html>
ENDNEWINDEX
            close(OUT);
            return $otherhostname;
        }
    }
    return;
}
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.