--- loncom/lond	2011/06/12 00:08:01	1.467.2.4
+++ loncom/lond	2011/05/13 02:58:02	1.472
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.467.2.4 2011/06/12 00:08:01 raeburn Exp $
+# $Id: lond,v 1.472 2011/05/13 02:58:02 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -15,6 +15,7 @@
 #
 # 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.
 #
@@ -59,7 +60,7 @@ my $DEBUG = 0;		       # Non zero to ena
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.467.2.4 $'; #' stupid emacs
+my $VERSION='$Revision: 1.472 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -420,8 +421,7 @@ sub ReadManagerTable {
 
    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
    if (!open (MANAGERS, $tablename)) {
-       my $hostname = &Apache::lonnet::hostname($perlvar{'lonHostID'});
-       if (&Apache::lonnet::is_LC_dns($hostname)) {
+       if (&loncapa_dns_server()) {
            &logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
        }
        return;
@@ -600,8 +600,8 @@ sub InstallFile {
 #
 #   ConfigFileFromSelector: converts a configuration file selector
 #                 into a configuration file pathname.
-#                 Supports the following file selectors:
-#                 hosts, domain, dns_hosts, dns_domain
+#                 Supports the following file selectors: 
+#                 hosts, domain, dns_hosts, dns_domain  
 #
 #
 #  Parameters:
@@ -614,12 +614,11 @@ sub ConfigFileFromSelector {
     my $tablefile;
 
     my $tabledir = $perlvar{'lonTabDir'}.'/';
-    if (($selector eq "hosts") || ($selector eq "domain") ||
+    if (($selector eq "hosts") || ($selector eq "domain") || 
         ($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
-        $tablefile =  $tabledir.$selector.'.tab';
+	$tablefile =  $tabledir.$selector.'.tab';
     }
     return $tablefile;
-
 }
 #
 #   PushFile:  Called to do an administrative push of a file.
@@ -646,7 +645,7 @@ sub PushFile {
     #   hosts.tab  ($filename eq host).
     #   domain.tab ($filename eq domain).
     #   dns_hosts.tab ($filename eq dns_host).
-    #   dns_domain.tab ($filename eq dns_domain).
+    #   dns_domain.tab ($filename eq dns_domain). 
     # Construct the destination filename or reject the request.
     #
     # lonManage is supposed to ensure this, however this session could be
@@ -677,8 +676,8 @@ sub PushFile {
 	 .$tablefile." $! </font>");
 	return "error:$!";
     } else {
-        &logthis('<font color="green"> Installed new '.$tablefile
-                 ." - transaction by: $clientname ($clientip)</font>");
+	&logthis('<font color="green"> Installed new '.$tablefile
+		 ."</font>");
         my $adminmail = $perlvar{'lonAdmEMail'};
         my $admindom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
         if ($admindom ne '') {
@@ -692,12 +691,16 @@ sub PushFile {
         }
         if ($adminmail =~ /^[^\@]+\@[^\@]+$/) {
             my $msg = new Mail::Send;
+            my $senderaddress =  $perlvar{'lonSysEMail'};
             $msg->to($adminmail);
             $msg->subject('LON-CAPA DNS update on '.$perlvar{'lonHostID'});
+            if ($senderaddress) {
+                 $msg->add('From',$senderaddress);
+            }
             $msg->add('Content-type','text/plain; charset=UTF-8');
             if (my $fh = $msg->open()) {
                 print $fh 'Update to '.$tablefile.' from Cluster Manager '.
-                          "$clientname ($clientip)\n";
+                          $client."\n";
                 $fh->close;
             }
         }
@@ -709,6 +712,25 @@ sub PushFile {
 
 }
 
+sub loncapa_dns_server {
+    my $lonhost = &Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
+    my $hoststable = "$perlvar{'lonTabDir'}/hosts.tab";
+    my $is_dns_server;
+    if (!open(HOSTS,"<$hoststable")) {
+        &logthis('<font color="yellow">Could not open hosts.tab to check for LON-CAPA DNS servers.</font>');
+        while (my $host = <HOSTS>) {
+            chomp($host);
+            $host =~ s/(^\s+|\s+$)//g;
+            if ($host =~ /^\Q^$lonhost\E/) {
+                $is_dns_server = 1;
+                last;
+            }
+        }
+        close(HOSTS);
+    }
+    return $is_dns_server;
+}
+
 #
 #  Called to re-init either lonc or lond.
 #
@@ -5038,7 +5060,7 @@ sub validate_course_owner_handler {
     my ($cmd, $tail, $client)  = @_;
     my $userinput = "$cmd:$tail";
     my ($inst_course_id, $owner, $cdom, $coowners) = split(/:/, $tail);
-
+    
     $owner = &unescape($owner);
     $coowners = &unescape($coowners);
     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom,$coowners);
@@ -6029,7 +6051,7 @@ if (-e $pidfile) {
 $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                                 Type      => SOCK_STREAM,
                                 Proto     => 'tcp',
-                                ReuseAddr => 1,
+                                ReuseAddr     => 1,
                                 Listen    => 10 )
   or die "making socket: $@\n";
 
@@ -6092,12 +6114,9 @@ sub HUPSMAN {                      # sig
 #  a setuid perl script that can be root for us to do this job.
 #
 sub ReloadApache {
-    if (&LONCAPA::try_to_lock('/tmp/lock_apachereload')) {
-        my $execdir = $perlvar{'lonDaemons'};
-        my $script  = $execdir."/apachereload";
-        system($script);
-        unlink('/tmp/lock_apachereload'); #  Remove the lock file.
-    }
+    my $execdir = $perlvar{'lonDaemons'};
+    my $script  = $execdir."/apachereload";
+    system($script);
 }
 
 #
@@ -6364,10 +6383,8 @@ my %iphost = &Apache::lonnet::get_iphost
 my $dist=`$perlvar{'lonDaemons'}/distprobe`;
 
 my $arch = `uname -i`;
-chomp($arch);
 if ($arch eq 'unknown') {
     $arch = `uname -m`;
-    chomp($arch);
 }
 
 # --------------------------------------------------------------
@@ -6436,13 +6453,12 @@ sub make_new_child {
                                 #don't get intercepted
         $SIG{USR1}= \&logstatus;
         $SIG{ALRM}= \&timeout;
-
-        #
-        # Block sigpipe as it gets thrownon socket disconnect and we want to
-        # deal with that as a read faiure instead.
-        #
-        my $blockset = POSIX::SigSet->new(SIGPIPE);
-        sigprocmask(SIG_BLOCK, $blockset);
+	#
+	# Block sigpipe as it gets thrownon socket disconnect and we want to 
+	# deal with that as a read faiure instead.
+	#
+	my $blockset = POSIX::SigSet->new(SIGPIPE);
+	sigprocmask(SIG_BLOCK, $blockset);
 
         $lastlog='Forked ';
         $status='Forked';