--- loncom/configuration/Firewall.pm	2010/12/30 18:40:29	1.7
+++ loncom/configuration/Firewall.pm	2011/02/25 19:41:59	1.8
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Firewall configuration to allow internal LON-CAPA communication between servers   
 #
-# $Id: Firewall.pm,v 1.7 2010/12/30 18:40:29 raeburn Exp $
+# $Id: Firewall.pm,v 1.8 2011/02/25 19:41:59 raeburn Exp $
 #
 # The LearningOnline Network with CAPA
 #
@@ -371,20 +371,26 @@ sub get_fw_chains {
     my ($iptables) = @_;
     my @fw_chains;
     my $suse_config = "/etc/sysconfig/SuSEfirewall2";
+    my $ubuntu_config = "/etc/ufw/ufw.conf";
     if (-e $suse_config) {
         push(@fw_chains,'input_ext');
     } else {
-        if (!-e '/etc/sysconfig/iptables') {
-            if (!-e '/var/lib/iptables') {
-                print("Unable to find iptables file containing static definitions\n");
+        my @posschains;
+        if (-e $ubuntu_config) {
+            @posschains = ('ufw-user-input','INPUT');
+        } else {
+            @posschains = ('RH-Firewall-1-INPUT','INPUT');
+            if (!-e '/etc/sysconfig/iptables') {
+                if (!-e '/var/lib/iptables') {
+                    print("Unable to find iptables file containing static definitions\n");
+                }
+                push(@fw_chains,'RH-Firewall-1-INPUT'); 
             }
-            push(@fw_chains,'RH-Firewall-1-INPUT'); 
         }
         if ($iptables eq '') {
             $iptables = &get_pathto_iptables();
         }
         my %counts;
-        my @posschains = ('RH-Firewall-1-INPUT','INPUT');
         if (open(PIPE,"$iptables -L -n |")) {
             while(<PIPE>) {
                 foreach my $chain (@posschains) {
@@ -397,7 +403,9 @@ sub get_fw_chains {
         }
         foreach my $fw_chain (@posschains) {
             if ($counts{$fw_chain}) {
-                push(@fw_chains,$fw_chain);
+                unless(grep(/^\Q$fw_chain\E$/,@fw_chains)) {
+                    push(@fw_chains,$fw_chain);
+                }
             }
         }
     }