host/ihost-perl/ihost.pl

#!/usr/bin/perl -w

# -----------------------------------------------------------
# Perl i-scream Host.
# http://www.i-scream.org.uk
#
# An all-in-one script to act as an i-scream host on
# a typical Unix/Linux box.
#
# $Author: tdb1 $
# $Id: ihost.pl,v 1.38 2001/11/19 15:07:56 tdb1 Exp $
#------------------------------------------------------------

$| = 1;

use strict;
use IO::Socket;
use Sys::Hostname;

use vars qw (
             $filter_manager_addr
             $filter_manager_port
             $seq_no
             $udp_update_time
             $tcp_update_time
             $last_udp_time
             $last_tcp_time
             $last_modified
             $udp_port
             $tcp_port
             $filter_addr
             $file_list
             $fqdn
             $pidfile
             $retry_wait
             @data
            );

if (@ARGV != 2) {
    die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n";
}

$filter_manager_addr = $ARGV[0];
$filter_manager_port = $ARGV[1];

$seq_no = 1;
$retry_wait = 60;

# write our PID to a file
$pidfile = "/var/tmp/ihost.pid";
&write_pid();

&tcp_configure();
&send_udp_packet();

$last_udp_time = time;
$last_tcp_time = time;
while (1) {
    my($time) = time;
    if ($time >= $last_udp_time + $udp_update_time) {
        &send_udp_packet();
        $last_udp_time = $time;
    }
    if ($time >= $last_tcp_time + $tcp_update_time) {
        &send_tcp_heartbeat();
        $last_tcp_time = $time;
    }
    my($next_udp) = $udp_update_time - $time + $last_udp_time;
    my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
    my($delay);
    if ($next_udp < $next_tcp) {
        $delay = $next_udp
    }
    else {
        $delay = $next_tcp;
    }
    sleep $delay;
}

# we'll probably never get here...
`rm -f $pidfile`;
exit(0);


#-----------------------------------------------------------------------
# wait_then_retry
# Waits for the period of time specified in $retry_wait, then attempts
# to reconfigure with the server.
#-----------------------------------------------------------------------
sub wait_then_retry() {
    print "Will retry configuration with filter manager in $retry_wait seconds.\n";
    sleep $retry_wait;
}


#-----------------------------------------------------------------------
# tcp_configure
# Establishes a TCP connection to the specified i-scream filter manager.
# The host then requests details from the server, such as the intervals
# at which to send UDP packets.
#-----------------------------------------------------------------------
sub tcp_configure() {
    
    while (1) {
        my($sock) = new IO::Socket::INET(
                                         PeerAddr => $filter_manager_addr,
                                         PeerPort => $filter_manager_port,
                                         Proto => 'tcp'
                                        ) or die "Cannot connect!";
        if (!defined $sock) {
            print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
            print "Please check that there is an i-scream server at this address.\n";
            wait_then_retry();
            next;
        }

        # Now run through the configuration process...
        my($response);
    
        print $sock "STARTCONFIG\n";
        $response = <$sock>;
        if ($response && !($response eq "OK\n")) {
            print "The i-scream server rejected the STARTCONFIG command.\n";
            close($sock);
            wait_then_retry();
            next;
        }

        print "Config started okay.\n";
    
        print $sock "LASTMODIFIED\n";
        $response = <$sock>;
        if (!$response) {
            print "The i-scream server did not return anything for the LASTMODIFIED command.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chop $response;
        $last_modified = $response;
    
        print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";

        print $sock "FILELIST\n";
        $response = <$sock>;
        if (!$response) {
            print "The i-scream server did not provide a configuration file list.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chop $response;
        $file_list = $response;

        print "File list obtained: $file_list\n";

        print $sock "FQDN\n";
        $response = <$sock>;
        if (!$response) {
            print "The i-scream server did not tell us our FQDN.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chop $response;
        $fqdn = $response;

        print "FQDN returned: $fqdn\n";

        print $sock "UDPUpdateTime\n";
        $response = <$sock>;
        if (!$response) {
            print "The i-scream server did not give us a UDPUpdateTime.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chop $response;
        $udp_update_time = $response;

        print $sock "TCPUpdateTime\n";
        $response = <$sock>;
        if (!$response) {
            print "The i-scream server did not give us a TCPUpdateTime.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chop $response;
        $tcp_update_time = $response;
    
        print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";

        print $sock "ENDCONFIG\n";
        $response = <$sock>;
        if ($response && !($response eq "OK\n")) {
            print "ENDCONFIG command to server failed.  Terminated.\n";
            close($sock);
            wait_then_retry();
            next;
        }

        print "Config ended.\n";
    
        print $sock "FILTER\n";
        $response = <$sock>;
        if (!$response) {
            print "Failed: Could not get a filter address from the filter manager.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chop $response;
        $response =~ /^(.*);(.*);(.*)/;
        if ($response eq "ERROR") {
            print "There are no active configured filters for your host.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        ($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
        unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) {
            print "Failed: Filter address response from server did not make sense: $response\n";
            close($sock);
            wait_then_retry();
            next;
        }
    
        print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";

        print $sock "END\n";
        $response = <$sock>;
        if ($response && ($response eq "OK\n")) {
            print "Host successfully configured via TCP.\n"
        }
        else {
            print "The server failed the host configuration on the END command.\n";
            close($sock);
            wait_then_retry();
            next;
        }
    
        close($sock);

        print "Configuration finished sucessfully!\n";
        last;
    }
    return;
}


#-----------------------------------------------------------------------
# send_udp_packet
# Sends a UDP packet to an i-scream filter.
# The packet contains XML markup describing some of the machine's state.
# Receipt of UDP packets is not guaranteed.
#-----------------------------------------------------------------------
sub send_udp_packet() {

    my($plugins_dir) = "plugins";
    
    opendir PLUGINS, $plugins_dir;
    my(@plugins) = readdir PLUGINS;
    foreach my $plugin (@plugins) {
        push @data, `$plugins_dir/$plugin` if -x "$plugins_dir/$plugin" && -f "$plugins_dir/$plugin";
    }
    
    # get some extra data
    my($date) = time;
    my($ip);
    $ip = inet_ntoa(scalar(gethostbyname(hostname())) || 'localhost') or $ip = 'localhost';
    
    # add some extra data to the array
    push(@data, "packet.attributes.seq_no=$seq_no");
    push(@data, "packet.attributes.machine_name=$fqdn");
    push(@data, "packet.attributes.date=$date");
    push(@data, "packet.attributes.type=data");
    push(@data, "packet.attributes.ip=$ip");
    
    # sort the data
    @data = sort(@data);
    
    # turn the array into some nice XML
    my($xml) = &make_xml("", "");
    
    my($sock) = new IO::Socket::INET (
                                      PeerPort => $udp_port,
                                      PeerAddr => $filter_addr,
                                      Proto => 'udp'
                                     ) or die "Could not send UDP: $!\n";
    
    print $sock $xml or die "Could not send UDP packet: $!\n";
    close($sock);
    $seq_no++;
    print "-";
    
    return;
}


#-----------------------------------------------------------------------
# send_tcp_heartbeat
# Establishes a TCP connection to an i-scream filter.
# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
# If we need to reconfigure, then we complete the heartbeat before
# doing so.
#-----------------------------------------------------------------------
sub send_tcp_heartbeat() {

    my ($doReconfigure) = 0;

    my($sock) = new IO::Socket::INET(
                                     PeerAddr => $filter_addr,
                                     PeerPort => $tcp_port,
                                     Proto => 'tcp'
                                    ) or return;
    if (!defined $sock) {
        print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
        &tcp_configure();
        return;
    }

    # Now run through the configuration process.
    my($response);

    print $sock "HEARTBEAT\n";
    $response = <$sock>;
    if (!$response eq "OK\n") {
        close($sock);
        print "Server gave wrong response to HEARTBEAT: $response\n";
        &tcp_configure();
        return;
    }
    
    print $sock "CONFIG\n";
    $response = <$sock>;
    if (!$response eq "OK\n") {
        close($sock);
        print "Server gave wrong response to CONFIG: $response\n";
        &tcp_configure();
        return;
    }

    print $sock "$file_list\n";
    $response = <$sock>;
    if (!$response eq "OK\n") {
        close($sock);
        print "Server gave wrong response to file list: $response\n";
        &tcp_configure();
        return;
    }
    
    print $sock "$last_modified\n";
    $response = <$sock>;
    if ($response eq "ERROR\n") {
        close($sock);
        print "Server configuration changed.  Reconfiguring with filter manager.\n";
        $doReconfigure = 1;
    }
    if (!$response eq "OK\n") {
        close($sock);
        print "Server gave wrong response to HEARTBEAT: $response\n";
        &tcp_configure();
        return;
    }
    
    print $sock "ENDHEARTBEAT\n";
    $response = <$sock>;
    if (!$response eq "OK\n") {
        close($sock);
        print "Server gave wrong response to ENDHEARTBEAT: $response\n";
        &tcp_configure();
        return;
    }
    
    close($sock);
    print "^";
    
    &tcp_configure() if $doReconfigure;
    
    return;
}


#-----------------------------------------------------------------------
# write_pid
# Writes the PID (process ID) of this instance to $pidfile.
# This is then used by a seperate script to check (and restart) ihost.
#-----------------------------------------------------------------------
sub write_pid() {
    open PID, ">$pidfile";
    print PID $$;
    close PID;
    
    return;
}

#-----------------------------------------------------------------------
# make_xml
# Turns an array of plugins data into an XML string.
#-----------------------------------------------------------------------
sub make_xml() {
    my($curlevel, $curline) = @_;
    my($xmltemp) = ""; my($curtag) = ""; my($attributes) = "";
    while(true) {
        $curline = shift(@data) if $curline eq ""; chomp $curline;
        if($curline =~ /^$curlevel([^\.\s]+\.)/) {
            $curtag=$1;
        }
        if($curline =~ /^$curlevel$curtag([^\.\s]+)\s+(.*)$/) {
            $xmltemp .= "<$1$attributes>$2</$1>";
        }
        elsif($curline =~ /^$curlevel$curtag(attributes)\.([^\.=]+)=(.*)$/) {
            $attributes .= " $2=\"$3\"";
        }
        else {
            $xmltemp .= &make_xml("$curlevel$curtag", $curline);
        }
        my($nextline) = $data[0]; chomp $nextline if defined $nextline;
        $curtag =~ s/(.*)\./$1/;                
        if(defined $nextline && $nextline =~ /^$curlevel$curtag\./) {
            $curline = "";
        }
        else {
            $xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
            return $xmltemp;
        }
    }
}
Revision:	1.39
Committed:	Mon Nov 19 17:43:00 2001 UTC (23 years ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.38:	+4 -1 lines
Log Message:	Can't believe I left the sort out! The data must be sorted for the XML creation code to work properly.
#	User	Rev	Content
1	pjm2	1.6	#!/usr/bin/perl -w
2	pjm2	1.1
3			# -----------------------------------------------------------
4			# Perl i-scream Host.
5	pjm2	1.12	# http://www.i-scream.org.uk
6	pjm2	1.1	#
7			# An all-in-one script to act as an i-scream host on
8	tdb	1.36	# a typical Unix/Linux box.
9	pjm2	1.1	#
10	tdb	1.36	# $Author: tdb1 $
11	tdb	1.39	# $Id: ihost.pl,v 1.38 2001/11/19 15:07:56 tdb1 Exp $
12	pjm2	1.1	#------------------------------------------------------------
13
14			$\| = 1;
15
16			use strict;
17			use IO::Socket;
18			use Sys::Hostname;
19
20			use vars qw (
21			$filter_manager_addr
22			$filter_manager_port
23			$seq_no
24			$udp_update_time
25			$tcp_update_time
26			$last_udp_time
27			$last_tcp_time
28			$last_modified
29			$udp_port
30			$tcp_port
31			$filter_addr
32			$file_list
33	pjm2	1.17	$fqdn
34	tdb	1.25	$pidfile
35	pjm2	1.28	$retry_wait
36	tdb	1.37	@data
37	pjm2	1.1	);
38
39			if (@ARGV != 2) {
40			die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n";
41			}
42
43			$filter_manager_addr = $ARGV[0];
44			$filter_manager_port = $ARGV[1];
45
46			$seq_no = 1;
47	pjm2	1.33	$retry_wait = 60;
48	pjm2	1.1
49	tdb	1.25	# write our PID to a file
50	tdb	1.26	$pidfile = "/var/tmp/ihost.pid";
51	tdb	1.25	&write_pid();
52
53	pjm2	1.1	&tcp_configure();
54			&send_udp_packet();
55
56			$last_udp_time = time;
57			$last_tcp_time = time;
58			while (1) {
59	pjm2	1.9	my($time) = time;
60			if ($time >= $last_udp_time + $udp_update_time) {
61	pjm2	1.1	&send_udp_packet();
62	pjm2	1.9	$last_udp_time = $time;
63	pjm2	1.1	}
64	pjm2	1.9	if ($time >= $last_tcp_time + $tcp_update_time) {
65	pjm2	1.1	&send_tcp_heartbeat();
66	pjm2	1.9	$last_tcp_time = $time;
67	pjm2	1.1	}
68	pjm2	1.9	my($next_udp) = $udp_update_time - $time + $last_udp_time;
69			my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
70			my($delay);
71			if ($next_udp < $next_tcp) {
72			$delay = $next_udp
73			}
74			else {
75			$delay = $next_tcp;
76			}
77	tdb	1.35	sleep $delay;
78	pjm2	1.1	}
79
80	tdb	1.25	# we'll probably never get here...
81			`rm -f $pidfile`;
82	pjm2	1.1	exit(0);
83
84	pjm2	1.12
85			#-----------------------------------------------------------------------
86	pjm2	1.28	# wait_then_retry
87			# Waits for the period of time specified in $retry_wait, then attempts
88			# to reconfigure with the server.
89			#-----------------------------------------------------------------------
90			sub wait_then_retry() {
91			print "Will retry configuration with filter manager in $retry_wait seconds.\n";
92	tdb	1.35	sleep $retry_wait;
93	pjm2	1.28	}
94
95
96			#-----------------------------------------------------------------------
97	pjm2	1.12	# tcp_configure
98			# Establishes a TCP connection to the specified i-scream filter manager.
99			# The host then requests details from the server, such as the intervals
100			# at which to send UDP packets.
101			#-----------------------------------------------------------------------
102	pjm2	1.1	sub tcp_configure() {
103
104	pjm2	1.31	while (1) {
105	pjm2	1.28	my($sock) = new IO::Socket::INET(
106			PeerAddr => $filter_manager_addr,
107			PeerPort => $filter_manager_port,
108			Proto => 'tcp'
109			) or die "Cannot connect!";
110			if (!defined $sock) {
111			print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
112			print "Please check that there is an i-scream server at this address.\n";
113			wait_then_retry();
114			next;
115			}
116
117			# Now run through the configuration process...
118			my($response);
119
120			print $sock "STARTCONFIG\n";
121			$response = <$sock>;
122	pjm2	1.32	if ($response && !($response eq "OK\n")) {
123			print "The i-scream server rejected the STARTCONFIG command.\n";
124	pjm2	1.28	close($sock);
125			wait_then_retry();
126			next;
127			}
128
129			print "Config started okay.\n";
130
131			print $sock "LASTMODIFIED\n";
132			$response = <$sock>;
133	pjm2	1.32	if (!$response) {
134			print "The i-scream server did not return anything for the LASTMODIFIED command.\n";
135			close($sock);
136			wait_then_retry();
137			next;
138			}
139	pjm2	1.28	chop $response;
140			$last_modified = $response;
141
142			print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
143
144			print $sock "FILELIST\n";
145			$response = <$sock>;
146	pjm2	1.32	if (!$response) {
147			print "The i-scream server did not provide a configuration file list.\n";
148			close($sock);
149			wait_then_retry();
150			next;
151			}
152	pjm2	1.28	chop $response;
153			$file_list = $response;
154
155			print "File list obtained: $file_list\n";
156
157			print $sock "FQDN\n";
158			$response = <$sock>;
159	pjm2	1.32	if (!$response) {
160			print "The i-scream server did not tell us our FQDN.\n";
161			close($sock);
162			wait_then_retry();
163			next;
164			}
165	pjm2	1.28	chop $response;
166			$fqdn = $response;
167
168			print "FQDN returned: $fqdn\n";
169
170			print $sock "UDPUpdateTime\n";
171			$response = <$sock>;
172	pjm2	1.32	if (!$response) {
173			print "The i-scream server did not give us a UDPUpdateTime.\n";
174			close($sock);
175			wait_then_retry();
176			next;
177			}
178	pjm2	1.28	chop $response;
179			$udp_update_time = $response;
180
181			print $sock "TCPUpdateTime\n";
182			$response = <$sock>;
183	pjm2	1.32	if (!$response) {
184			print "The i-scream server did not give us a TCPUpdateTime.\n";
185			close($sock);
186			wait_then_retry();
187			next;
188			}
189	pjm2	1.28	chop $response;
190			$tcp_update_time = $response;
191
192			print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
193
194			print $sock "ENDCONFIG\n";
195			$response = <$sock>;
196	pjm2	1.32	if ($response && !($response eq "OK\n")) {
197	pjm2	1.28	print "ENDCONFIG command to server failed. Terminated.\n";
198			close($sock);
199			wait_then_retry();
200			next;
201			}
202
203			print "Config ended.\n";
204
205			print $sock "FILTER\n";
206			$response = <$sock>;
207	pjm2	1.32	if (!$response) {
208	pjm2	1.28	print "Failed: Could not get a filter address from the filter manager.\n";
209			close($sock);
210			wait_then_retry();
211			next;
212			}
213			chop $response;
214	pjm2	1.32	$response =~ /^(.);(.);(.*)/;
215	pjm2	1.28	if ($response eq "ERROR") {
216			print "There are no active configured filters for your host.\n";
217			close($sock);
218			wait_then_retry();
219			next;
220			}
221			($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
222			unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) {
223			print "Failed: Filter address response from server did not make sense: $response\n";
224			close($sock);
225			wait_then_retry();
226			next;
227			}
228
229			print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
230
231			print $sock "END\n";
232			$response = <$sock>;
233	pjm2	1.32	if ($response && ($response eq "OK\n")) {
234	pjm2	1.28	print "Host successfully configured via TCP.\n"
235			}
236			else {
237	pjm2	1.32	print "The server failed the host configuration on the END command.\n";
238	pjm2	1.28	close($sock);
239			wait_then_retry();
240			next;
241			}
242	pjm2	1.1
243	pjm2	1.28	close($sock);
244	pjm2	1.1
245	pjm2	1.28	print "Configuration finished sucessfully!\n";
246			last;
247	pjm2	1.1	}
248	pjm2	1.12	return;
249	pjm2	1.1	}
250
251	pjm2	1.12
252			#-----------------------------------------------------------------------
253			# send_udp_packet
254			# Sends a UDP packet to an i-scream filter.
255			# The packet contains XML markup describing some of the machine's state.
256			# Receipt of UDP packets is not guaranteed.
257			#-----------------------------------------------------------------------
258	pjm2	1.1	sub send_udp_packet() {
259
260	tdb	1.37	my($plugins_dir) = "plugins";
261
262			opendir PLUGINS, $plugins_dir;
263			my(@plugins) = readdir PLUGINS;
264			foreach my $plugin (@plugins) {
265			push @data, `$plugins_dir/$plugin` if -x "$plugins_dir/$plugin" && -f "$plugins_dir/$plugin";
266			}
267	pjm2	1.1
268	tdb	1.36	# get some extra data
269	pjm2	1.1	my($date) = time;
270	pjm2	1.33	my($ip);
271			$ip = inet_ntoa(scalar(gethostbyname(hostname())) \|\| 'localhost') or $ip = 'localhost';
272	tdb	1.36
273			# add some extra data to the array
274	tdb	1.37	push(@data, "packet.attributes.seq_no=$seq_no");
275			push(@data, "packet.attributes.machine_name=$fqdn");
276			push(@data, "packet.attributes.date=$date");
277			push(@data, "packet.attributes.type=data");
278			push(@data, "packet.attributes.ip=$ip");
279	tdb	1.39
280			# sort the data
281			@data = sort(@data);
282	tdb	1.36
283			# turn the array into some nice XML
284			my($xml) = &make_xml("", "");
285
286	pjm2	1.1	my($sock) = new IO::Socket::INET (
287			PeerPort => $udp_port,
288			PeerAddr => $filter_addr,
289			Proto => 'udp'
290	pjm2	1.21	) or die "Could not send UDP: $!\n";
291	tdb	1.36
292	pjm2	1.1	print $sock $xml or die "Could not send UDP packet: $!\n";
293			close($sock);
294			$seq_no++;
295	tdb	1.38	print "-";
296	pjm2	1.12
297			return;
298	pjm2	1.1	}
299
300	pjm2	1.12
301			#-----------------------------------------------------------------------
302			# send_tcp_heartbeat
303			# Establishes a TCP connection to an i-scream filter.
304			# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
305	pjm2	1.34	# If we need to reconfigure, then we complete the heartbeat before
306			# doing so.
307	pjm2	1.12	#-----------------------------------------------------------------------
308	pjm2	1.1	sub send_tcp_heartbeat() {
309
310	pjm2	1.34	my ($doReconfigure) = 0;
311
312	pjm2	1.1	my($sock) = new IO::Socket::INET(
313			PeerAddr => $filter_addr,
314			PeerPort => $tcp_port,
315			Proto => 'tcp'
316	pjm2	1.21	) or return;
317	pjm2	1.11	if (!defined $sock) {
318			print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
319	pjm2	1.27	&tcp_configure();
320	pjm2	1.11	return;
321			}
322	pjm2	1.1
323			# Now run through the configuration process.
324			my($response);
325
326			print $sock "HEARTBEAT\n";
327			$response = <$sock>;
328	pjm2	1.32	if (!$response eq "OK\n") {
329	pjm2	1.1	close($sock);
330			print "Server gave wrong response to HEARTBEAT: $response\n";
331	pjm2	1.27	&tcp_configure();
332	pjm2	1.1	return;
333			}
334
335			print $sock "CONFIG\n";
336			$response = <$sock>;
337	pjm2	1.32	if (!$response eq "OK\n") {
338	pjm2	1.1	close($sock);
339			print "Server gave wrong response to CONFIG: $response\n";
340	pjm2	1.27	&tcp_configure();
341	pjm2	1.1	return;
342			}
343
344			print $sock "$file_list\n";
345			$response = <$sock>;
346	pjm2	1.32	if (!$response eq "OK\n") {
347	pjm2	1.1	close($sock);
348			print "Server gave wrong response to file list: $response\n";
349	pjm2	1.27	&tcp_configure();
350	pjm2	1.1	return;
351			}
352
353			print $sock "$last_modified\n";
354			$response = <$sock>;
355	pjm2	1.32	if ($response eq "ERROR\n") {
356	pjm2	1.1	close($sock);
357	pjm2	1.27	print "Server configuration changed. Reconfiguring with filter manager.\n";
358	pjm2	1.34	$doReconfigure = 1;
359	pjm2	1.1	}
360	pjm2	1.32	if (!$response eq "OK\n") {
361	pjm2	1.1	close($sock);
362			print "Server gave wrong response to HEARTBEAT: $response\n";
363	pjm2	1.27	&tcp_configure();
364	pjm2	1.1	return;
365			}
366
367			print $sock "ENDHEARTBEAT\n";
368	pjm2	1.23	$response = <$sock>;
369	pjm2	1.32	if (!$response eq "OK\n") {
370	pjm2	1.1	close($sock);
371			print "Server gave wrong response to ENDHEARTBEAT: $response\n";
372	pjm2	1.27	&tcp_configure();
373	pjm2	1.1	return;
374			}
375
376			close($sock);
377			print "^";
378	pjm2	1.34
379			&tcp_configure() if $doReconfigure;
380	tdb	1.25
381			return;
382			}
383
384	tdb	1.36
385	tdb	1.25	#-----------------------------------------------------------------------
386			# write_pid
387			# Writes the PID (process ID) of this instance to $pidfile.
388			# This is then used by a seperate script to check (and restart) ihost.
389			#-----------------------------------------------------------------------
390			sub write_pid() {
391			open PID, ">$pidfile";
392			print PID $$;
393			close PID;
394	pjm2	1.12
395			return;
396	tdb	1.36	}
397
398			#-----------------------------------------------------------------------
399			# make_xml
400	tdb	1.37	# Turns an array of plugins data into an XML string.
401	tdb	1.36	#-----------------------------------------------------------------------
402			sub make_xml() {
403			my($curlevel, $curline) = @_;
404			my($xmltemp) = ""; my($curtag) = ""; my($attributes) = "";
405			while(true) {
406	tdb	1.37	$curline = shift(@data) if $curline eq ""; chomp $curline;
407	tdb	1.36	if($curline =~ /^$curlevel([^\.\s]+\.)/) {
408			$curtag=$1;
409			}
410			if($curline =~ /^$curlevel$curtag([^\.\s]+)\s+(.*)$/) {
411			$xmltemp .= "<$1$attributes>$2</$1>";
412			}
413			elsif($curline =~ /^$curlevel$curtag(attributes)\.([^\.=]+)=(.*)$/) {
414			$attributes .= " $2=\"$3\"";
415			}
416			else {
417			$xmltemp .= &make_xml("$curlevel$curtag", $curline);
418			}
419	tdb	1.37	my($nextline) = $data[0]; chomp $nextline if defined $nextline;
420	tdb	1.36	$curtag =~ s/(.*)\./$1/;
421			if(defined $nextline && $nextline =~ /^$curlevel$curtag\./) {
422			$curline = "";
423			}
424			else {
425			$xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
426			return $xmltemp;
427			}
428			}
429	pjm2	1.1	}