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 1.41 2001/11/20 12:47:03 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
# use home dir by default
#$pidfile = $ENV{"HOME"};
# or drop it in /var/tmp if we can't find HOME
$pidfile = "/var/tmp" if not defined $pidfile;
$pidfile .= "/.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(1) {
        $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:	1.42
Committed:	Wed Nov 21 10:08:20 2001 UTC (22 years, 10 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.41:	+2 -2 lines
Log Message:	This change has been rolled back. It caused no end of problems for us because our home directories are NFS mounted - so the PID file was the same on a whole block of our hosts... which meant the PID checking really didn't want to work :) Not to mention the problems introduced with the NFS going funny at times ;) <sigh>
#	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	1.42	# $Id: ihost.pl,v 1.41 2001/11/20 12:47:03 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	$retry_wait = 60;
48	pjm2	1.1
49	tdb	1.25	# write our PID to a file
50	tdb	1.41	# use home dir by default
51	tdb	1.42	#$pidfile = $ENV{"HOME"};
52	tdb	1.41	# or drop it in /var/tmp if we can't find HOME
53			$pidfile = "/var/tmp" if not defined $pidfile;
54			$pidfile .= "/.ihost.pid";
55	tdb	1.25	&write_pid();
56
57	pjm2	1.1	&tcp_configure();
58			&send_udp_packet();
59
60			$last_udp_time = time;
61			$last_tcp_time = time;
62			while (1) {
63	pjm2	1.9	my($time) = time;
64			if ($time >= $last_udp_time + $udp_update_time) {
65	pjm2	1.1	&send_udp_packet();
66	pjm2	1.9	$last_udp_time = $time;
67	pjm2	1.1	}
68	pjm2	1.9	if ($time >= $last_tcp_time + $tcp_update_time) {
69	pjm2	1.1	&send_tcp_heartbeat();
70	pjm2	1.9	$last_tcp_time = $time;
71	pjm2	1.1	}
72	pjm2	1.9	my($next_udp) = $udp_update_time - $time + $last_udp_time;
73			my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
74			my($delay);
75			if ($next_udp < $next_tcp) {
76			$delay = $next_udp
77			}
78			else {
79			$delay = $next_tcp;
80			}
81	tdb	1.35	sleep $delay;
82	pjm2	1.1	}
83
84	tdb	1.25	# we'll probably never get here...
85			`rm -f $pidfile`;
86	pjm2	1.1	exit(0);
87
88	pjm2	1.12
89			#-----------------------------------------------------------------------
90	pjm2	1.28	# wait_then_retry
91			# Waits for the period of time specified in $retry_wait, then attempts
92			# to reconfigure with the server.
93			#-----------------------------------------------------------------------
94			sub wait_then_retry() {
95			print "Will retry configuration with filter manager in $retry_wait seconds.\n";
96	tdb	1.35	sleep $retry_wait;
97	pjm2	1.28	}
98
99
100			#-----------------------------------------------------------------------
101	pjm2	1.12	# tcp_configure
102			# Establishes a TCP connection to the specified i-scream filter manager.
103			# The host then requests details from the server, such as the intervals
104			# at which to send UDP packets.
105			#-----------------------------------------------------------------------
106	pjm2	1.1	sub tcp_configure() {
107
108	pjm2	1.31	while (1) {
109	pjm2	1.28	my($sock) = new IO::Socket::INET(
110			PeerAddr => $filter_manager_addr,
111			PeerPort => $filter_manager_port,
112			Proto => 'tcp'
113			) or die "Cannot connect!";
114			if (!defined $sock) {
115			print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
116			print "Please check that there is an i-scream server at this address.\n";
117			wait_then_retry();
118			next;
119			}
120
121			# Now run through the configuration process...
122			my($response);
123
124			print $sock "STARTCONFIG\n";
125			$response = <$sock>;
126	pjm2	1.32	if ($response && !($response eq "OK\n")) {
127			print "The i-scream server rejected the STARTCONFIG command.\n";
128	pjm2	1.28	close($sock);
129			wait_then_retry();
130			next;
131			}
132
133			print "Config started okay.\n";
134
135			print $sock "LASTMODIFIED\n";
136			$response = <$sock>;
137	pjm2	1.32	if (!$response) {
138			print "The i-scream server did not return anything for the LASTMODIFIED command.\n";
139			close($sock);
140			wait_then_retry();
141			next;
142			}
143	pjm2	1.28	chop $response;
144			$last_modified = $response;
145
146			print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
147
148			print $sock "FILELIST\n";
149			$response = <$sock>;
150	pjm2	1.32	if (!$response) {
151			print "The i-scream server did not provide a configuration file list.\n";
152			close($sock);
153			wait_then_retry();
154			next;
155			}
156	pjm2	1.28	chop $response;
157			$file_list = $response;
158
159			print "File list obtained: $file_list\n";
160
161			print $sock "FQDN\n";
162			$response = <$sock>;
163	pjm2	1.32	if (!$response) {
164			print "The i-scream server did not tell us our FQDN.\n";
165			close($sock);
166			wait_then_retry();
167			next;
168			}
169	pjm2	1.28	chop $response;
170			$fqdn = $response;
171
172			print "FQDN returned: $fqdn\n";
173
174			print $sock "UDPUpdateTime\n";
175			$response = <$sock>;
176	pjm2	1.32	if (!$response) {
177			print "The i-scream server did not give us a UDPUpdateTime.\n";
178			close($sock);
179			wait_then_retry();
180			next;
181			}
182	pjm2	1.28	chop $response;
183			$udp_update_time = $response;
184
185			print $sock "TCPUpdateTime\n";
186			$response = <$sock>;
187	pjm2	1.32	if (!$response) {
188			print "The i-scream server did not give us a TCPUpdateTime.\n";
189			close($sock);
190			wait_then_retry();
191			next;
192			}
193	pjm2	1.28	chop $response;
194			$tcp_update_time = $response;
195
196			print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
197
198			print $sock "ENDCONFIG\n";
199			$response = <$sock>;
200	pjm2	1.32	if ($response && !($response eq "OK\n")) {
201	pjm2	1.28	print "ENDCONFIG command to server failed. Terminated.\n";
202			close($sock);
203			wait_then_retry();
204			next;
205			}
206
207			print "Config ended.\n";
208
209			print $sock "FILTER\n";
210			$response = <$sock>;
211	pjm2	1.32	if (!$response) {
212	pjm2	1.28	print "Failed: Could not get a filter address from the filter manager.\n";
213			close($sock);
214			wait_then_retry();
215			next;
216			}
217			chop $response;
218	pjm2	1.32	$response =~ /^(.);(.);(.*)/;
219	pjm2	1.28	if ($response eq "ERROR") {
220			print "There are no active configured filters for your host.\n";
221			close($sock);
222			wait_then_retry();
223			next;
224			}
225			($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
226			unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) {
227			print "Failed: Filter address response from server did not make sense: $response\n";
228			close($sock);
229			wait_then_retry();
230			next;
231			}
232
233			print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
234
235			print $sock "END\n";
236			$response = <$sock>;
237	pjm2	1.32	if ($response && ($response eq "OK\n")) {
238	pjm2	1.28	print "Host successfully configured via TCP.\n"
239			}
240			else {
241	pjm2	1.32	print "The server failed the host configuration on the END command.\n";
242	pjm2	1.28	close($sock);
243			wait_then_retry();
244			next;
245			}
246	pjm2	1.1
247	pjm2	1.28	close($sock);
248	pjm2	1.1
249	pjm2	1.28	print "Configuration finished sucessfully!\n";
250			last;
251	pjm2	1.1	}
252	pjm2	1.12	return;
253	pjm2	1.1	}
254
255	pjm2	1.12
256			#-----------------------------------------------------------------------
257			# send_udp_packet
258			# Sends a UDP packet to an i-scream filter.
259			# The packet contains XML markup describing some of the machine's state.
260			# Receipt of UDP packets is not guaranteed.
261			#-----------------------------------------------------------------------
262	pjm2	1.1	sub send_udp_packet() {
263
264	tdb	1.37	my($plugins_dir) = "plugins";
265
266			opendir PLUGINS, $plugins_dir;
267			my(@plugins) = readdir PLUGINS;
268			foreach my $plugin (@plugins) {
269			push @data, `$plugins_dir/$plugin` if -x "$plugins_dir/$plugin" && -f "$plugins_dir/$plugin";
270			}
271	pjm2	1.1
272	tdb	1.36	# get some extra data
273	pjm2	1.1	my($date) = time;
274	pjm2	1.33	my($ip);
275			$ip = inet_ntoa(scalar(gethostbyname(hostname())) \|\| 'localhost') or $ip = 'localhost';
276	tdb	1.36
277			# add some extra data to the array
278	tdb	1.37	push(@data, "packet.attributes.seq_no=$seq_no");
279			push(@data, "packet.attributes.machine_name=$fqdn");
280			push(@data, "packet.attributes.date=$date");
281			push(@data, "packet.attributes.type=data");
282			push(@data, "packet.attributes.ip=$ip");
283	tdb	1.39
284			# sort the data
285			@data = sort(@data);
286	tdb	1.36
287			# turn the array into some nice XML
288			my($xml) = &make_xml("", "");
289
290	pjm2	1.1	my($sock) = new IO::Socket::INET (
291			PeerPort => $udp_port,
292			PeerAddr => $filter_addr,
293			Proto => 'udp'
294	pjm2	1.21	) or die "Could not send UDP: $!\n";
295	tdb	1.36
296	pjm2	1.1	print $sock $xml or die "Could not send UDP packet: $!\n";
297			close($sock);
298			$seq_no++;
299	tdb	1.38	print "-";
300	pjm2	1.12
301			return;
302	pjm2	1.1	}
303
304	pjm2	1.12
305			#-----------------------------------------------------------------------
306			# send_tcp_heartbeat
307			# Establishes a TCP connection to an i-scream filter.
308			# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
309	pjm2	1.34	# If we need to reconfigure, then we complete the heartbeat before
310			# doing so.
311	pjm2	1.12	#-----------------------------------------------------------------------
312	pjm2	1.1	sub send_tcp_heartbeat() {
313
314	pjm2	1.34	my ($doReconfigure) = 0;
315
316	pjm2	1.1	my($sock) = new IO::Socket::INET(
317			PeerAddr => $filter_addr,
318			PeerPort => $tcp_port,
319			Proto => 'tcp'
320	pjm2	1.21	) or return;
321	pjm2	1.11	if (!defined $sock) {
322			print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
323	pjm2	1.27	&tcp_configure();
324	pjm2	1.11	return;
325			}
326	pjm2	1.1
327			# Now run through the configuration process.
328			my($response);
329
330			print $sock "HEARTBEAT\n";
331			$response = <$sock>;
332	pjm2	1.32	if (!$response eq "OK\n") {
333	pjm2	1.1	close($sock);
334			print "Server gave wrong response to HEARTBEAT: $response\n";
335	pjm2	1.27	&tcp_configure();
336	pjm2	1.1	return;
337			}
338
339			print $sock "CONFIG\n";
340			$response = <$sock>;
341	pjm2	1.32	if (!$response eq "OK\n") {
342	pjm2	1.1	close($sock);
343			print "Server gave wrong response to CONFIG: $response\n";
344	pjm2	1.27	&tcp_configure();
345	pjm2	1.1	return;
346			}
347
348			print $sock "$file_list\n";
349			$response = <$sock>;
350	pjm2	1.32	if (!$response eq "OK\n") {
351	pjm2	1.1	close($sock);
352			print "Server gave wrong response to file list: $response\n";
353	pjm2	1.27	&tcp_configure();
354	pjm2	1.1	return;
355			}
356
357			print $sock "$last_modified\n";
358			$response = <$sock>;
359	pjm2	1.32	if ($response eq "ERROR\n") {
360	pjm2	1.1	close($sock);
361	pjm2	1.27	print "Server configuration changed. Reconfiguring with filter manager.\n";
362	pjm2	1.34	$doReconfigure = 1;
363	pjm2	1.1	}
364	pjm2	1.32	if (!$response eq "OK\n") {
365	pjm2	1.1	close($sock);
366			print "Server gave wrong response to HEARTBEAT: $response\n";
367	pjm2	1.27	&tcp_configure();
368	pjm2	1.1	return;
369			}
370
371			print $sock "ENDHEARTBEAT\n";
372	pjm2	1.23	$response = <$sock>;
373	pjm2	1.32	if (!$response eq "OK\n") {
374	pjm2	1.1	close($sock);
375			print "Server gave wrong response to ENDHEARTBEAT: $response\n";
376	pjm2	1.27	&tcp_configure();
377	pjm2	1.1	return;
378			}
379
380			close($sock);
381			print "^";
382	pjm2	1.34
383			&tcp_configure() if $doReconfigure;
384	tdb	1.25
385			return;
386			}
387
388	tdb	1.36
389	tdb	1.25	#-----------------------------------------------------------------------
390			# write_pid
391			# Writes the PID (process ID) of this instance to $pidfile.
392			# This is then used by a seperate script to check (and restart) ihost.
393			#-----------------------------------------------------------------------
394			sub write_pid() {
395			open PID, ">$pidfile";
396			print PID $$;
397			close PID;
398	pjm2	1.12
399			return;
400	tdb	1.36	}
401
402			#-----------------------------------------------------------------------
403			# make_xml
404	tdb	1.37	# Turns an array of plugins data into an XML string.
405	tdb	1.36	#-----------------------------------------------------------------------
406			sub make_xml() {
407			my($curlevel, $curline) = @_;
408			my($xmltemp) = ""; my($curtag) = ""; my($attributes) = "";
409	tdb	1.40	while(1) {
410	tdb	1.37	$curline = shift(@data) if $curline eq ""; chomp $curline;
411	tdb	1.36	if($curline =~ /^$curlevel([^\.\s]+\.)/) {
412			$curtag=$1;
413			}
414			if($curline =~ /^$curlevel$curtag([^\.\s]+)\s+(.*)$/) {
415			$xmltemp .= "<$1$attributes>$2</$1>";
416			}
417			elsif($curline =~ /^$curlevel$curtag(attributes)\.([^\.=]+)=(.*)$/) {
418			$attributes .= " $2=\"$3\"";
419			}
420			else {
421			$xmltemp .= &make_xml("$curlevel$curtag", $curline);
422			}
423	tdb	1.37	my($nextline) = $data[0]; chomp $nextline if defined $nextline;
424	tdb	1.36	$curtag =~ s/(.*)\./$1/;
425	tdb	1.40	if((defined $nextline) && ($nextline =~ /^$curlevel$curtag\./)) {
426	tdb	1.36	$curline = "";
427			}
428			else {
429			$xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
430			return $xmltemp;
431			}
432			}
433	pjm2	1.1	}