--- loncom/cgi/ping.pl	2002/09/09 14:18:56	1.3
+++ loncom/cgi/ping.pl	2008/11/28 20:50:25	1.7
@@ -1,42 +1,55 @@
 #!/usr/bin/perl
-
-# The LearningOnline Network with CAPA
 # ping cgi-script
+# $Id: ping.pl,v 1.7 2008/11/28 20:50:25 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;
 $|=1;
 
 use lib '/home/httpd/lib/perl/';
-use LONCAPA::Configuration;
+use Apache::lonnet;
+use LONCAPA::loncgi;
 
-use IO::File;
-use IO::Socket;
+print("Content-type: text/plain\n\n");
 
-# -------------------------------------------------- Non-critical communication
-sub reply {
-    my ($cmd,$server)=@_;
-    my $peerfile="$perlvar{'lonSockDir'}/$server";
-    my $client=IO::Socket::UNIX->new(Peer    =>"$peerfile",
-                                     Type    => SOCK_STREAM,
-                                     Timeout => 10)
-       or return "con_lost";
-    print $client "$cmd\n";
-    my $answer=<$client>;
-    chomp($answer);
-    if (!$answer) { $answer="con_lost"; }
-    return $answer;
-}
+&main();
 
+sub main {
+    if (!&LONCAPA::loncgi::check_ipbased_access('ping')) {
+        if (!&LONCAPA::loncgi::check_cookie_and_load_env()) {
+            return;
+        }
 
-# --------------------- Read loncapa.conf (and by default loncapa_apache.conf).
-my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
-my %perlvar=%{$perlvarref};
-undef $perlvarref; # remove since sensitive and not needed
-delete $perlvar{'lonReceipt'}; # remove since sensitive and not needed
-delete $perlvar{'lonSqlAccess'}; # remove since sensitive and not needed
+        if (!&LONCAPA::loncgi::can_view('ping')) {
+            return;
+        }
+    }
 
-$testhost=$ENV{'QUERY_STRING'};
-$testhost=~s/\W//g;
+    my $testhost=$ENV{'QUERY_STRING'};
+    $testhost=~s/\W//g;
 
-print "Content-type: text/plain\n\n".
-      &reply('ping',$testhost)."\n";
+    print &Apache::lonnet::reply('ping',$testhost)."\n";
+    return;
+}