Annotation of loncom/cgi/takeoffline.pl, revision 1.8
1.1 www 1: #!/usr/bin/perl
1.3 raeburn 2: $|=1;
1.1 www 3: # Take machine offline, reroute traffic
4: #
1.8 ! raeburn 5: # $Id: takeoffline.pl,v 1.7 2010/03/22 20:11:15 droeschl Exp $
1.1 www 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29:
1.3 raeburn 30: use strict;
31: use lib '/home/httpd/lib/perl/';
32: use Apache::lonlocal;
1.5 raeburn 33: use Apache::loncommon;
1.8 ! raeburn 34: use Apache::lonnet;
1.3 raeburn 35: use LONCAPA::loncgi;
1.4 raeburn 36: use LONCAPA::lonauthcgi;
1.3 raeburn 37:
38: print "Content-type: text/html\n\n";
39:
40: &main();
41:
42: sub main {
1.4 raeburn 43: if (!&LONCAPA::lonauthcgi::check_ipbased_access('takeoffline')) {
1.3 raeburn 44: if (!&LONCAPA::loncgi::check_cookie_and_load_env()) {
45: &Apache::lonlocal::get_language_handle();
46: print(&LONCAPA::loncgi::missing_cookie_msg());
47: return;
48: }
49:
1.4 raeburn 50: if (!&LONCAPA::lonauthcgi::can_view('takeoffline')) {
1.3 raeburn 51: &Apache::lonlocal::get_language_handle();
1.4 raeburn 52: print(&LONCAPA::lonauthcgi::unauthorized_msg('takeoffline'));
1.3 raeburn 53: return;
54: }
55: }
1.5 raeburn 56: &Apache::lonlocal::get_language_handle();
57:
58: if ($ENV{'QUERY_STRING'} =~ /^phase\=two\&?(.*)$/) {
59: my $reroute = $1;
1.7 droeschl 60: print &Apache::loncommon::start_page('Take Offline');
1.5 raeburn 61: &phasetwo($reroute);
62: } else {
63: my $js = <<ENDJS;
64: <script type="text/javascript">
1.8 ! raeburn 65: // <![CDATA[
1.5 raeburn 66:
67: function setphase(form) {
68: var subaction = '/cgi-bin/takeoffline.pl?phase=two';
69: form.action = subaction+'&'+form.rerouteto.options[form.rerouteto.selectedIndex].value;
70: form.submit();
71: }
72:
1.8 ! raeburn 73: // ]]>
1.5 raeburn 74: </script>
75: ENDJS
1.7 droeschl 76: print &Apache::loncommon::start_page('Take Offline',$js);
1.5 raeburn 77: &phaseone();
78: }
79: print &Apache::loncommon::end_page();
80: return;
81: }
82:
83: sub phaseone {
84: print '<h2>'.&Apache::lonlocal::mt('Take Offline').'</h2>';
85: my ($is_dc,@okmachines,%servers);
86: my @poss_domains = &Apache::lonnet::current_machine_domains();
87: foreach my $dom (@poss_domains) {
88: if ($Apache::lonnet::env{'request.role'} eq "dc./$dom/") {
89: $is_dc = 1;
90: }
91: my %domconfig = &Apache::lonnet::get_dom('configuration',['serverstatuses'],$dom);
92: if (ref($domconfig{'serverstatuses'}) eq 'HASH') {
93: if (ref($domconfig{'serverstatuses'}{'takeonline'}) eq 'HASH') {
94: if ($domconfig{'serverstatuses'}{'takeonline'}{'machines'} ne '') {
95: @okmachines = split(/,/,$domconfig{'serverstatuses'}{'takeonline'}{'machines'});
96: }
97: }
98: }
99: %{$servers{$dom}} = &Apache::lonnet::get_servers($dom);
100: }
101: my $ip = $ENV{'REMOTE_ADDR'};
102: my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
1.8 ! raeburn 103: print '<p>'.&mt("When a LON-CAPA server is 'taken offline' using this utility, the standard log-in page will be replaced with one of the following:").'</p>'.
1.5 raeburn 104: '<ul><li>'.&mt('A page which automatically performs a redirect to another server in your domain - the server must be specified below.').'</li>'.
1.8 ! raeburn 105: '<li>'.&mt('A page which announces that this LON-CAPA server is offline.').'</li></ul>';
1.5 raeburn 106: print '<p>'.&mt("Once a server is offline, the [_1]'take online'[_2] utility can be used to reverse this, but you should verify that you will still be able to access that script once the server is in an offline state.",'<a href="/cgi-bin/takeonline.pl">','</a>').'</p>';
1.8 ! raeburn 107: print '<p>'.&mt("In common with other Domain Status pages the 'take online' script is accessible from certain IP addresses:").'</p><ul>'.
1.5 raeburn 108: '<li>'.&mt('The loopback device - 127.0.0.1 (localhost) - for times when you are web browsing from the server itself.').'</li>'.
1.8 ! raeburn 109: '<li>'.&mt("Specified IP addresses set via the configuration for [_1]Access to Server Status Pages[_2] for domain(s) hosted on the server.",'<a href="/adm/domainprefs?phase=display&actions=serverstatuses">','</a>').'</li></ul><p>'.
! 110: &mt("Once the server is offline you will not be able to log-in directly to select a Domain Coordinator role to use the 'Take online' script, unless IP-based controls provide your access.").'<br />'.&mt("However, you will be able to log-in to a different server in the LON-CAPA network, select a Domain Coordinator role in this server's domain, and then use: [_1] to migrate you session to this machine.","<br /><tt>/adm/switchserver?otherserver=$lonhost</tt>").'<br /></p><hr />';
1.5 raeburn 111: if ($ip eq '127.0.0.1') {
112: print '<div class="LC_info">'.&mt('You are accessing this page from the loopback device.').'</div>';
113: } elsif (!@okmachines) {
114: print '<div class="LC_warning">'.&mt("IP-based access to the 'take online' page is currently unavailable, as no IP addresses have been specified.").'</div>';
115: } elsif (!grep(/^\Q$ip\E$/,@okmachines)) {
116: print '<div class="LC_warning">'.&mt("Your current IP [_1] is not among those configured to have IP-based access to the 'take online' utility.",$ip).'</div>';
117: } else {
118: print '<div class="LC_info">'.&mt("Your current IP [_1] is configured to have IP-based access to the 'take online' utility.",$ip).'</div>';
119: }
120: my (%allhosts,$otherserver,$domain);
121: if ($ENV{'QUERY_STRING'}) {
122: ($otherserver,$domain)=split(/\&/,$ENV{'QUERY_STRING'});
123: }
1.8 ! raeburn 124: print '<hr /><form method="post" name="takeoffline" onsubmit="javascript:setphase(this);" action="">';
1.3 raeburn 125:
1.5 raeburn 126: my $options;
127: if ($domain) {
128: if (grep(/^\Q$domain\E$/,keys(%servers))) {
129: if (ref($servers{$domain}) eq 'HASH') {
130: foreach my $hostid (sort(keys(%{$servers{$domain}}))) {
131: next if ($hostid eq $lonhost);
132: my $selchk = '';
133: if ($otherserver eq $hostid) {
1.8 ! raeburn 134: $selchk = ' selected="selected"';
1.5 raeburn 135: }
136: $options .=
1.8 ! raeburn 137: "<option value=\"$hostid&$domain\"$selchk>$servers{$domain}{$hostid}</option>\n";
1.5 raeburn 138: }
139: }
140: }
141: }
142: foreach my $dom (sort(keys(%servers))) {
143: next if (($domain) && ($dom eq $domain));
144: if (ref($servers{$dom}) eq 'HASH') {
145: foreach my $hostid (sort(keys(%{$servers{$dom}}))) {
146: next if ($hostid eq $lonhost);
147: next if(defined($allhosts{$hostid}));
148: $allhosts{$hostid} = 1;
149: my $selchk = '';
150: if ($otherserver eq $hostid) {
1.8 ! raeburn 151: $selchk = ' selected="selected"';
1.5 raeburn 152: }
1.8 ! raeburn 153: $options .=
! 154: "<option value=\"$hostid&$dom\"$selchk>$servers{$dom}{$hostid}</option>\n";
1.5 raeburn 155: }
156: }
157: }
158: if ($options) {
159: print &mt('Optional: choose another server in your domain, to which to redirect log-ins: ').
160: '<select name="rerouteto">'."\n".
161: ' <option value="">'.&mt('Please select').'</option>'."\n".
162: $options.'</select>'."\n";
163: } else {
164: print &mt('There are no other servers in your domain to which to redirect logins.');
165: }
166: print '<br /><br /><input type="submit" name="offline" value="Take Offline" />'."\n".
167: '</form>'."\n";
168: }
1.3 raeburn 169:
1.5 raeburn 170: sub phasetwo {
171: my ($reroute) = @_;
172: print '<h2>'.&Apache::lonlocal::mt('Take Offline').'</h2>';
1.3 raeburn 173: my $statusmsg;
1.8 ! raeburn 174: if ($reroute ne '') {
1.5 raeburn 175: my ($otherserver,$domain)=split(/\&/,$reroute);
1.8 ! raeburn 176: my $otherhostname = &reroute($otherserver,$domain);
! 177: if ($otherhostname ne '') {
! 178: print &Apache::lonlocal::mt('Rerouting to [_1]',$otherhostname);
1.3 raeburn 179: $statusmsg = "status=rerouting&server=$otherserver&domain=$domain&time=".time.
180: "by=$Apache::lonnet::env{'user.name'}:$Apache::lonnet::env{'user.domain'}";
181: }
182: } else {
183: if (&dead()) {
184: print &Apache::lonlocal::mt('No reroute server given, taking completely offline.');
185: $statusmsg = 'status=offline&time='.time."by=$Apache::lonnet::env{'user.name'}:$Apache::lonnet::env{'user.domain'}"
186: }
187: }
188: if ($statusmsg) {
189: if (open (STATUS,'>/home/httpd/html/lon-status/reroute.txt')) {
190: print STATUS "$statusmsg\n";
191: close(STATUS);
192: } else {
1.5 raeburn 193: print &Apache::lonlocal::mt('Logging of status change to [_1] failed.','<tt>/home/httpd/html/lon-status/reroute.txt</tt>');
1.3 raeburn 194: }
195: }
1.1 www 196: }
197:
198: sub dead {
1.3 raeburn 199: if (open (OUT,'>/home/httpd/html/index.html')) {
200: print OUT &Apache::lonlocal::mt('This LON-CAPA server is currently offline.');
201: close(OUT);
202: return 'ok';
203: }
204: return;
1.1 www 205: }
206:
207: sub reroute {
1.3 raeburn 208: my ($otherserver,$domain) = @_;
1.8 ! raeburn 209: my $otherhostname = &Apache::lonnet::hostname($otherserver);
! 210: my $protocol = $Apache::lonnet::protocol{$otherserver};
! 211: $protocol = 'http' if ($protocol ne 'https');
! 212: if ($otherhostname ne '') {
! 213: if (open (OUT,'>/home/httpd/html/index.html')) {
! 214: print OUT (<<ENDNEWINDEX);
! 215: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
! 216: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
1.1 www 217: <head>
218: <title>Welcome to the LearningOnline Network with CAPA</title>
1.8 ! raeburn 219: <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
! 220: <meta http-equiv="refresh" content="0.5; url=$protocol://$otherhostname/adm/login?domain=$domain">
! 221: <meta http-equiv="pragma" content="no-cache" />
1.1 www 222: </head>
1.8 ! raeburn 223: <body style="background-color:#004400; margin: 0px;">
! 224: <img src="/adm/lonIcons/header.gif" alt="loncapa banner" />
! 225: <p style="color:#ffffff">Connecting to
! 226: <a href="$protocol://$otherhostname/adm/login?domain=$domain" style="color:#ffffff">$protocol://$otherhostname/</a></p>
1.1 www 227: </body>
228: </html>
229: ENDNEWINDEX
1.8 ! raeburn 230: close(OUT);
! 231: return $otherhostname;
! 232: }
1.3 raeburn 233: }
234: return;
1.1 www 235: }
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