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diff --git a/contrib/check_ica_master_browser.pl b/contrib/check_ica_master_browser.pl
--- /dev/null
@@ -0,0 +1,229 @@
+#!/usr/bin/perl -w
+
+# $Id$
+
+# $Log$
+# Revision 1.1 2005/01/25 09:09:33 stanleyhopcroft
+# New plugin - checks that ICA master browser is what it should be (important for firewalled dialup)
+#
+
+use strict ;
+
+use IO::Socket;
+use IO::Select;
+use Getopt::Long ;
+
+use lib qw(/usr/local/nagios/libexec) ;
+use utils qw(%ERRORS &print_revision &support &usage);
+use packet_utils qw(&pdump &tethereal) ;
+
+my $PROGNAME = 'check_ica_master_browser' ;
+
+# You might have to change this...
+
+my $PACKET_TIMEOUT = 1;
+ # Number of seconds to wait for further UDP packets
+my $TEST_COUNT = 2;
+ # Number of datagrams sent without reply
+my $BUFFER_SIZE = 1500;
+ # buffer size used for 'recv' calls.
+my $ICA_PORT = 1604;
+ # what port ICA runs on. Unlikely to change.
+
+# End user config.
+
+my ($debug, $preferred_master, $bcast_addr, $ica_browser, $timeout) ;
+
+Getopt::Long::Configure('bundling', 'no_ignore_case');
+GetOptions
+ ("V|version" => \&version,
+ "h|help" => \&help,
+ "v|verbose" => \$debug,
+ "B|broadcast_addr:s" => \$bcast_addr,
+ "I|ica_browser:s" => \$ica_browser,
+ "P|preferred_master:s" => \$preferred_master,
+ "T|Packet_timeout:i" => \$timeout,
+) ;
+
+
+my $broadcast_addr = $1 if $bcast_addr and $bcast_addr =~ m#(\d+\.\d+\.\d+\.\d+)# ;
+usage("Invalid broadcast address: $bcast_addr")
+ if $bcast_addr and not defined($broadcast_addr) ;
+
+usage("You must provide either the name of an ICA browser or the broadcast address of the subnet containing them\n")
+ unless ($ica_browser or $broadcast_addr) ;
+
+usage("You must provide the name or address of a preferred ICA master browser\n")
+ unless ($preferred_master) ;
+
+my $preferred_master_n = $preferred_master =~ m#(\d+\.\d+\.\d+\.\d+)#
+ ? $preferred_master
+ : inet_ntoa(scalar gethostbyname($preferred_master)) ;
+
+my $Timeout = $timeout || $PACKET_TIMEOUT ;
+
+ # Definitions of query strings. Change at your own risk :)
+ # this info was gathered with tcpdump whilst trying to use an ICA client,
+ # so I'm not 100% sure of what each value is.
+
+my $bcast_helo = &tethereal(<<'End_of_Tethereal_trace', '1e') ;
+0020 ff ff 04 d6 06 44 00 26 4a 76 1e 00 01 30 02 fd .....D.&Jv...0..
+0030 a8 e3 00 02 f5 95 9f f5 30 07 00 00 00 00 00 00 ........0.......
+0040 00 00 00 00 00 00 01 00 ........
+End_of_Tethereal_trace
+
+my $direct_helo = &tethereal(<<'End_of_Tethereal_trace', '20') ;
+0020 64 17 05 0f 06 44 00 28 ab b5 20 00 01 30 02 fd d....D.(.. ..0..
+0030 a8 e3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
+0040 00 00 00 00 00 00 00 00 00 00 ........
+End_of_Tethereal_trace
+
+my $Udp = IO::Socket::INET->new( Proto => 'udp' )
+ || die "Socket failure: $!";
+
+ # select is here to allow us to set timeouts on the connections. Otherwise they
+ # just 'stop' until a server appears.
+
+my $select = IO::Select->new($Udp)
+ || die "Select failure: $!";
+
+$Udp->sockopt(SO_BROADCAST, 1 );
+
+my ($remote_host, $buff, $destination, $raddr, $rport, $rhost, @remote_response);
+my ($query_message, $send_addr, $this_test) ;
+
+$buff = '';
+$this_test = 0;
+
+ # If there is no response to the first helo packet it will be resent
+ # up to $TEST_COUNT (see at the top).
+
+$query_message = $broadcast_addr ? $bcast_helo : $direct_helo ;
+$destination = $broadcast_addr ? $broadcast_addr: $ica_browser ;
+$send_addr = sockaddr_in($ICA_PORT, inet_aton($destination) ) ;
+
+while ( ++$this_test <= $TEST_COUNT && !$buff ) {
+
+ print "Sending helo datagram. datagram number: ", $this_test, "\n"
+ if $debug ;
+
+ print "Querying $destination for master browser\n"
+ if $debug ;
+ &pdump($query_message)
+ if $debug ;
+ $Udp->send($query_message, 0, $send_addr );
+ if ( $select->can_read($Timeout) ) {
+ $remote_host = $Udp->recv($buff, $BUFFER_SIZE, 0 );
+ }
+
+ last
+ if $buff ;
+ sleep 1 ;
+
+}
+
+ # Ok we've looped several times, looking for a response. If we don't have one
+ # yet, we simply mark the whole lot as being unavailable.
+
+unless ( $buff ) {
+ print "Failed. No response to helo datagram (master browser query) from $destination.\n" ;
+ exit $ERRORS{CRITICAL} ;
+}
+
+($rport, $raddr) = sockaddr_in( $remote_host );
+$rhost = gethostbyaddr( $raddr, AF_INET );
+my @tmpbuf = unpack('C*', $buff );
+if ( $debug ) {
+ print "$rhost:$rport responded with: ",length($buff), " bytes\n";
+ &pdump($buff) ;
+}
+
+ # Now we have a response, then we need to figure out the master browser, and
+ # query it for published applications...
+
+my $master_browser = join '.', @tmpbuf[32..35] ;
+my ($master_browser_a) = gethostbyaddr(inet_aton($master_browser), AF_INET) =~ /^(\w+?)\./ ;
+
+ # Ok should probably error check this, because it's remotely possible
+ # that a server response might be completely wrong...
+
+print "Master browser = $master_browser_a/$master_browser\n"
+ if $debug ;
+
+$send_addr = sockaddr_in($ICA_PORT, inet_aton($master_browser));
+
+my $subject_clause = $bcast_addr ? "of the \"$destination\" subnet" : "known to ICA server \"$destination\"" ;
+
+if ( $master_browser eq $preferred_master_n ) {
+ print "Preferred master browser \"$preferred_master\" __is__ the master browser (\"$master_browser_a/$master_browser\") $subject_clause.\n" ;
+ exit $ERRORS{OK} ;
+} else {
+ print "\"\u$preferred_master\" is __not__ the master browser (\"$master_browser_a/$master_browser\") $subject_clause: remote clients (dialup) may not find Published applications from Master Browser.\n" ;
+ exit $ERRORS{CRITICAL} ;
+}
+
+close $Udp;
+
+
+sub print_usage () {
+ print "Usage: $PROGNAME (-B <broadcast_address>| -I <citrix_server>) - P <preferred_master_browser>" ;
+}
+
+sub print_help () {
+ print_revision($PROGNAME,'$Revision$ ');
+ print "Copyright (c) 2002 Ed Rolison/Tom De Blende/S Hopcroft
+
+Perl Check Citrix Master Browser plugin for Nagios.
+
+Returns OK if the Citrix master browser is that given by the -P option.
+
+The plugin works by
+ If the -B option is specified, sends a broadcast helo to find the address of the Citrix master browser in the specified subnet.
+ return critical if there is no reply;
+ Else if the -I option is specified
+ send a direct helo to the specified server until there is a response (containing the address of the Citrix master browser)
+
+
+ return Critical if the response does not contain the address of the 'preferred master browser' (-P option).
+ return OK
+
+ How ICA Clients Use the Master ICA Browser.
+
+Citrix ICA Clients must locate the master browser to get the address of a server or published application.
+
+The Citrix ICA Client can locate the master browser by sending out broadcast packets, or,
+if the address of a Citrix server is specified in the Citrix ICA Client or in an ICA file,
+the ICA Client locates the master browser by sending directed packets to the specified address.
+The ICA Client requests the address of the ICA master browser from the Citrix server.
+
+";
+ print_usage();
+ print '
+-B, --broadcast_address:STRING
+ The broadcast address that should contain Citrix master browser. This option takes precedence over -I.
+-I, --ica_browser:STRING
+ Optional name or address of an ICA server that could be the master browser (used when broadcast not possible).
+-P, --preferred_master:STRING
+ Name or address of the ICA server that _should_ be the master browser.
+ Required.
+-T, --packet-timeout:INTEGER
+ Time to wait for UDP packets (default 1 sec).
+-v, --verbose
+ Debugging output.
+-h, --help
+ This stuff.
+
+';
+ support();
+}
+
+sub version () {
+ print_revision($PROGNAME,'$Revision$ ');
+ exit $ERRORS{'OK'};
+}
+
+sub help () {
+ print_help();
+ exit $ERRORS{'OK'};
+}
+