Annotation of loncom/cgi/takeoffline.pl, revision 1.6
1.1 www 1: #!/usr/bin/perl
1.3 raeburn 2: $|=1;
1.1 www 3: # Take machine offline, reroute traffic
4: #
1.6 ! bisitz 5: # $Id: takeoffline.pl,v 1.5 2009/01/06 08:08:44 raeburn 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;
1.3 raeburn 34: use LONCAPA::loncgi;
1.4 raeburn 35: use LONCAPA::lonauthcgi;
1.3 raeburn 36:
37: print "Content-type: text/html\n\n";
38:
39: &main();
40:
41: sub main {
1.4 raeburn 42: if (!&LONCAPA::lonauthcgi::check_ipbased_access('takeoffline')) {
1.3 raeburn 43: if (!&LONCAPA::loncgi::check_cookie_and_load_env()) {
44: &Apache::lonlocal::get_language_handle();
45: print(&LONCAPA::loncgi::missing_cookie_msg());
46: return;
47: }
48:
1.4 raeburn 49: if (!&LONCAPA::lonauthcgi::can_view('takeoffline')) {
1.3 raeburn 50: &Apache::lonlocal::get_language_handle();
1.4 raeburn 51: print(&LONCAPA::lonauthcgi::unauthorized_msg('takeoffline'));
1.3 raeburn 52: return;
53: }
54: }
1.5 raeburn 55: &Apache::lonlocal::get_language_handle();
56:
57: if ($ENV{'QUERY_STRING'} =~ /^phase\=two\&?(.*)$/) {
58: my $reroute = $1;
59: print &Apache::loncommon::start_page('Take Offline','',
60: {'no_inline_link' => 1,});
61: &phasetwo($reroute);
62: } else {
63: my $js = <<ENDJS;
64: <script type="text/javascript">
65:
66: function setphase(form) {
67: var subaction = '/cgi-bin/takeoffline.pl?phase=two';
68: form.action = subaction+'&'+form.rerouteto.options[form.rerouteto.selectedIndex].value;
69: form.submit();
70: }
71:
72: </script>
73: ENDJS
74: print &Apache::loncommon::start_page('Take Offline',$js,
75: {'no_inline_link' => 1,});
76: &phaseone();
77: }
78: print &Apache::loncommon::end_page();
79: return;
80: }
81:
82: sub phaseone {
83: # print '<html><body bgcolor="#FFFFFF">
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 = $Apache::lonnet::perlvar{'lonHostID'};
103: print '<p>'.&mt("When a LON-CAPA server is 'taken offline' using this utility, the standard log-in page will be replaced with one of the following:").
104: '<ul><li>'.&mt('A page which automatically performs a redirect to another server in your domain - the server must be specified below.').'</li>'.
105: '<li>'.&mt('A page which announces that this LON-CAPA server is offline.').'</li></ul></p>';
106: print '<p>'.&mt("Once a server is offline, the [_1]'take online'[_2] utility can be used to reverse this, but you should verify that you will still be able to access that script once the server is in an offline state.",'<a href="/cgi-bin/takeonline.pl">','</a>').'</p>';
107: print '<p>'.&mt("In common with other Domain Status pages the 'take online' script is accessible from certain IP addresses:").'<ul>'.
108: '<li>'.&mt('The loopback device - 127.0.0.1 (localhost) - for times when you are web browsing from the server itself.').'</li>'.
109: '<li>'.&mt("Specified IP addresses set via the configuration for [_1]Access to Server Status Pages[_2] for domain(s) hosted on the server.",'<a href="/adm/domainprefs?phase=display&actions=serverstatuses">','</a>').'</li></ul><p>'.
110: &mt("Once the server is offline you will not be able to log-in directly to select a Domain Coordinator role to use the 'Take online' script, unless IP-based controls provide your access.").'<br />'.&mt("However, you will be able to log-in to a different server in the LON-CAPA network, select a Domain Coordinator role in this server's domain, and then use: [_1] to migrate you session to this machine.","<br /><tt>/adm/switchserver?otherserver=$lonhost</tt>").'<br /></p><p><hr /></p>';
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: }
124: print '<p><hr /></p><p><form method="post" name="takeoffline" onSubmit="javascript:setphase(this);">';
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) {
134: $selchk = 'selected="selected"';
135: }
136: $options .=
137: "<option value=\"$hostid&$domain\" $selchk>"."\n".
138: "$hostid ".&mt('Domain: [_1], Hostname: [_2]',$domain,$servers{$domain}{$hostid}).'</option>'."\n";
139: }
140: }
141: }
142: }
143: foreach my $dom (sort(keys(%servers))) {
144: next if (($domain) && ($dom eq $domain));
145: if (ref($servers{$dom}) eq 'HASH') {
146: foreach my $hostid (sort(keys(%{$servers{$dom}}))) {
147: next if ($hostid eq $lonhost);
148: next if(defined($allhosts{$hostid}));
149: $allhosts{$hostid} = 1;
150: my $selchk = '';
151: if ($otherserver eq $hostid) {
152: $selchk = 'selected="selected"';
153: }
154: $options .=
155: "<option value=\"$hostid&$dom\" $selchk>".
156: $hostid.'</option>';
157: }
158: }
159: }
160: if ($options) {
161: print &mt('Optional: choose another server in your domain, to which to redirect log-ins: ').
162: '<select name="rerouteto">'."\n".
163: ' <option value="">'.&mt('Please select').'</option>'."\n".
164: $options.'</select>'."\n";
165: } else {
166: print &mt('There are no other servers in your domain to which to redirect logins.');
167: }
168: print '<br /><br /><input type="submit" name="offline" value="Take Offline" />'."\n".
169: '</form>'."\n";
170: }
1.3 raeburn 171:
1.5 raeburn 172: sub phasetwo {
173: my ($reroute) = @_;
174: print '<h2>'.&Apache::lonlocal::mt('Take Offline').'</h2>';
1.3 raeburn 175: my $statusmsg;
1.5 raeburn 176: if ($reroute) {
177: my ($otherserver,$domain)=split(/\&/,$reroute);
1.3 raeburn 178: if (&reroute($otherserver,$domain)) {
179: print &Apache::lonlocal::mt('Rerouting to [_1]',$otherserver);
180: $statusmsg = "status=rerouting&server=$otherserver&domain=$domain&time=".time.
181: "by=$Apache::lonnet::env{'user.name'}:$Apache::lonnet::env{'user.domain'}";
182: }
183: } else {
184: if (&dead()) {
185: print &Apache::lonlocal::mt('No reroute server given, taking completely offline.');
186: $statusmsg = 'status=offline&time='.time."by=$Apache::lonnet::env{'user.name'}:$Apache::lonnet::env{'user.domain'}"
187: }
188: }
189: if ($statusmsg) {
190: if (open (STATUS,'>/home/httpd/html/lon-status/reroute.txt')) {
191: print STATUS "$statusmsg\n";
192: close(STATUS);
193: } else {
1.5 raeburn 194: print &Apache::lonlocal::mt('Logging of status change to [_1] failed.','<tt>/home/httpd/html/lon-status/reroute.txt</tt>');
1.3 raeburn 195: }
196: }
1.1 www 197: }
198:
199: sub dead {
1.3 raeburn 200: if (open (OUT,'>/home/httpd/html/index.html')) {
201: print OUT &Apache::lonlocal::mt('This LON-CAPA server is currently offline.');
202: close(OUT);
203: return 'ok';
204: }
205: return;
1.1 www 206: }
207:
208: sub reroute {
1.3 raeburn 209: my ($otherserver,$domain) = @_;
210: if (open (OUT,'>/home/httpd/html/index.html')) {
211: print OUT (<<ENDNEWINDEX);
1.1 www 212: <html>
213: <head>
214: <title>Welcome to the LearningOnline Network with CAPA</title>
1.2 www 215: <meta HTTP-EQUIV="Refresh" CONTENT="0.5; url=http://$otherserver/adm/login?domain=$domain">
1.1 www 216: </head>
1.6 ! bisitz 217: <body style="background-color:"#004400"; margin: 0px;">
1.1 www 218: <img src="/adm/lonIcons/header.gif" />
219: <p><font color="#FFFFFF">Connecting to
1.2 www 220: <a href="http://$otherserver/adm/login?domain=$domain"><font color="#FFFFFF">http://$otherserver/</font></a></font></p>
1.1 www 221: </body>
222: </html>
223: ENDNEWINDEX
1.3 raeburn 224: close(OUT);
225: return 'ok';
226: }
227: return;
1.1 www 228: }
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