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: tdb $
# $Id: ihost.pl,v 1.45 2001/12/18 06:07:00 tdb 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
             $ostype
             @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;

# work out our platform, if we can.
$ostype = `uname -s`;
chomp $ostype;
$ostype = "unknown" if not defined $ostype;

# 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 $ostype` if -x "$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(grep(!/^$/, grep(/^packet\./, @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 "";
        return $xmltemp if not defined $curline;
        chomp $curline;
        # dealing with nest (or attributes)
        if($curline =~ /^$curlevel([^\.\s]+\.)/) {
            $curtag=$1;
            if($curline =~ /^$curlevel$curtag([^\.\s]+)\s+(.*)$/) {
                $xmltemp .= &make_xml("$curlevel$curtag", $curline);
            }
            elsif($curline =~ /^$curlevel$curtag(attributes)\.([^\.\s]+)\s+(.*)$/) {
                $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 $xmltemp;
            }
        }
        # dealing with value
        elsif($curline =~ /^$curlevel([^\.\s]+)\s+(.*)$/) {
            $curtag=$1;
            $xmltemp=$2;           
            my($nextline) = $data[0]; chomp $nextline if defined $nextline;
            if(defined $nextline && ($nextline =~ /^$curlevel$curtag\./ || $nextline =~ /^$curlevel$curtag\s+/)) {
                $curline = ""; 
            }
            else {
                $xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
                return $xmltemp;
            }
        }
        # dealing with a null value
        elsif($curline =~ /^$curlevel([^\.\s]+)$/) {
            # simply adding a space makes the above elsif deal with it :)
            # just level with an empty tag in the XML
            $curline .= " ";
        }
        # failing all that, skip the line
        else {
            $curline = "";
        }
    }
}
Revision:	1.46
Committed:	Mon Mar 11 13:34:24 2002 UTC (22 years, 6 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.45:	+11 -1 lines
Log Message:	If data is given from an ihost plugin with just a tag name, ihost loops forever. An example of such a line is "packet.testlevel.test". This commit fixes this by taking advantage of a kludge :) If the above line was infact "packet.testlevel.test " it would be parsed, albeit creating an empty nest of XML: "<packet><testlevel><test></test></testlevel></packet>". Seeing as this is probably what was intended we just add a space to the end of the offending line and have another go at parsing it :) Also, to further ensure this doesn't happen in future, a catchall statement has been added to drop any lines which don't seem to make sense.
#	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	1.44	# $Author: tdb $
11	tdb	1.46	# $Id: ihost.pl,v 1.45 2001/12/18 06:07:00 tdb 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	1.44	$ostype
37	tdb	1.37	@data
38	pjm2	1.1	);
39
40			if (@ARGV != 2) {
41			die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n";
42			}
43
44			$filter_manager_addr = $ARGV[0];
45			$filter_manager_port = $ARGV[1];
46
47			$seq_no = 1;
48	pjm2	1.33	$retry_wait = 60;
49	pjm2	1.1
50	tdb	1.44	# work out our platform, if we can.
51			$ostype = `uname -s`;
52			chomp $ostype;
53			$ostype = "unknown" if not defined $ostype;
54
55	tdb	1.25	# write our PID to a file
56	tdb	1.41	# use home dir by default
57	tdb	1.42	#$pidfile = $ENV{"HOME"};
58	tdb	1.41	# or drop it in /var/tmp if we can't find HOME
59			$pidfile = "/var/tmp" if not defined $pidfile;
60			$pidfile .= "/.ihost.pid";
61	tdb	1.25	&write_pid();
62
63	pjm2	1.1	&tcp_configure();
64			&send_udp_packet();
65
66			$last_udp_time = time;
67			$last_tcp_time = time;
68			while (1) {
69	pjm2	1.9	my($time) = time;
70			if ($time >= $last_udp_time + $udp_update_time) {
71	pjm2	1.1	&send_udp_packet();
72	pjm2	1.9	$last_udp_time = $time;
73	pjm2	1.1	}
74	pjm2	1.9	if ($time >= $last_tcp_time + $tcp_update_time) {
75	pjm2	1.1	&send_tcp_heartbeat();
76	pjm2	1.9	$last_tcp_time = $time;
77	pjm2	1.1	}
78	pjm2	1.9	my($next_udp) = $udp_update_time - $time + $last_udp_time;
79			my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
80			my($delay);
81			if ($next_udp < $next_tcp) {
82			$delay = $next_udp
83			}
84			else {
85			$delay = $next_tcp;
86			}
87	tdb	1.35	sleep $delay;
88	pjm2	1.1	}
89
90	tdb	1.25	# we'll probably never get here...
91			`rm -f $pidfile`;
92	pjm2	1.1	exit(0);
93
94	pjm2	1.12
95			#-----------------------------------------------------------------------
96	pjm2	1.28	# wait_then_retry
97			# Waits for the period of time specified in $retry_wait, then attempts
98			# to reconfigure with the server.
99			#-----------------------------------------------------------------------
100			sub wait_then_retry() {
101			print "Will retry configuration with filter manager in $retry_wait seconds.\n";
102	tdb	1.35	sleep $retry_wait;
103	pjm2	1.28	}
104
105
106			#-----------------------------------------------------------------------
107	pjm2	1.12	# tcp_configure
108			# Establishes a TCP connection to the specified i-scream filter manager.
109			# The host then requests details from the server, such as the intervals
110			# at which to send UDP packets.
111			#-----------------------------------------------------------------------
112	pjm2	1.1	sub tcp_configure() {
113
114	pjm2	1.31	while (1) {
115	pjm2	1.28	my($sock) = new IO::Socket::INET(
116			PeerAddr => $filter_manager_addr,
117			PeerPort => $filter_manager_port,
118			Proto => 'tcp'
119			) or die "Cannot connect!";
120			if (!defined $sock) {
121			print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
122			print "Please check that there is an i-scream server at this address.\n";
123			wait_then_retry();
124			next;
125			}
126
127			# Now run through the configuration process...
128			my($response);
129
130			print $sock "STARTCONFIG\n";
131			$response = <$sock>;
132	pjm2	1.32	if ($response && !($response eq "OK\n")) {
133			print "The i-scream server rejected the STARTCONFIG command.\n";
134	pjm2	1.28	close($sock);
135			wait_then_retry();
136			next;
137			}
138
139			print "Config started okay.\n";
140
141			print $sock "LASTMODIFIED\n";
142			$response = <$sock>;
143	pjm2	1.32	if (!$response) {
144			print "The i-scream server did not return anything for the LASTMODIFIED command.\n";
145			close($sock);
146			wait_then_retry();
147			next;
148			}
149	pjm2	1.28	chop $response;
150			$last_modified = $response;
151
152			print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
153
154			print $sock "FILELIST\n";
155			$response = <$sock>;
156	pjm2	1.32	if (!$response) {
157			print "The i-scream server did not provide a configuration file list.\n";
158			close($sock);
159			wait_then_retry();
160			next;
161			}
162	pjm2	1.28	chop $response;
163			$file_list = $response;
164
165			print "File list obtained: $file_list\n";
166
167			print $sock "FQDN\n";
168			$response = <$sock>;
169	pjm2	1.32	if (!$response) {
170			print "The i-scream server did not tell us our FQDN.\n";
171			close($sock);
172			wait_then_retry();
173			next;
174			}
175	pjm2	1.28	chop $response;
176			$fqdn = $response;
177
178			print "FQDN returned: $fqdn\n";
179
180			print $sock "UDPUpdateTime\n";
181			$response = <$sock>;
182	pjm2	1.32	if (!$response) {
183			print "The i-scream server did not give us a UDPUpdateTime.\n";
184			close($sock);
185			wait_then_retry();
186			next;
187			}
188	pjm2	1.28	chop $response;
189			$udp_update_time = $response;
190
191			print $sock "TCPUpdateTime\n";
192			$response = <$sock>;
193	pjm2	1.32	if (!$response) {
194			print "The i-scream server did not give us a TCPUpdateTime.\n";
195			close($sock);
196			wait_then_retry();
197			next;
198			}
199	pjm2	1.28	chop $response;
200			$tcp_update_time = $response;
201
202			print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
203
204			print $sock "ENDCONFIG\n";
205			$response = <$sock>;
206	pjm2	1.32	if ($response && !($response eq "OK\n")) {
207	pjm2	1.28	print "ENDCONFIG command to server failed. Terminated.\n";
208			close($sock);
209			wait_then_retry();
210			next;
211			}
212
213			print "Config ended.\n";
214
215			print $sock "FILTER\n";
216			$response = <$sock>;
217	pjm2	1.32	if (!$response) {
218	pjm2	1.28	print "Failed: Could not get a filter address from the filter manager.\n";
219			close($sock);
220			wait_then_retry();
221			next;
222			}
223			chop $response;
224	pjm2	1.32	$response =~ /^(.);(.);(.*)/;
225	pjm2	1.28	if ($response eq "ERROR") {
226			print "There are no active configured filters for your host.\n";
227			close($sock);
228			wait_then_retry();
229			next;
230			}
231			($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
232			unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) {
233			print "Failed: Filter address response from server did not make sense: $response\n";
234			close($sock);
235			wait_then_retry();
236			next;
237			}
238
239			print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
240
241			print $sock "END\n";
242			$response = <$sock>;
243	pjm2	1.32	if ($response && ($response eq "OK\n")) {
244	pjm2	1.28	print "Host successfully configured via TCP.\n"
245			}
246			else {
247	pjm2	1.32	print "The server failed the host configuration on the END command.\n";
248	pjm2	1.28	close($sock);
249			wait_then_retry();
250			next;
251			}
252	pjm2	1.1
253	pjm2	1.28	close($sock);
254	pjm2	1.1
255	pjm2	1.28	print "Configuration finished sucessfully!\n";
256			last;
257	pjm2	1.1	}
258	pjm2	1.12	return;
259	pjm2	1.1	}
260
261	pjm2	1.12
262			#-----------------------------------------------------------------------
263			# send_udp_packet
264			# Sends a UDP packet to an i-scream filter.
265			# The packet contains XML markup describing some of the machine's state.
266			# Receipt of UDP packets is not guaranteed.
267			#-----------------------------------------------------------------------
268	pjm2	1.1	sub send_udp_packet() {
269
270	tdb	1.37	my($plugins_dir) = "plugins";
271
272			opendir PLUGINS, $plugins_dir;
273			my(@plugins) = readdir PLUGINS;
274			foreach my $plugin (@plugins) {
275	tdb	1.44	push @data, `$plugins_dir/$plugin $ostype` if -x "$plugins_dir/$plugin" && -f "$plugins_dir/$plugin";
276	tdb	1.37	}
277	pjm2	1.1
278	tdb	1.36	# get some extra data
279	pjm2	1.1	my($date) = time;
280	pjm2	1.33	my($ip);
281			$ip = inet_ntoa(scalar(gethostbyname(hostname())) \|\| 'localhost') or $ip = 'localhost';
282	tdb	1.36
283			# add some extra data to the array
284	tdb	1.43	push(@data, "packet.attributes.seq_no $seq_no");
285			push(@data, "packet.attributes.machine_name $fqdn");
286			push(@data, "packet.attributes.date $date");
287			push(@data, "packet.attributes.type data");
288			push(@data, "packet.attributes.ip $ip");
289	tdb	1.39
290			# sort the data
291	tdb	1.43	@data = sort(grep(!/^$/, grep(/^packet\./, @data)));
292
293	tdb	1.36	# turn the array into some nice XML
294			my($xml) = &make_xml("", "");
295	tdb	1.43
296	pjm2	1.1	my($sock) = new IO::Socket::INET (
297			PeerPort => $udp_port,
298			PeerAddr => $filter_addr,
299			Proto => 'udp'
300	pjm2	1.21	) or die "Could not send UDP: $!\n";
301	tdb	1.36
302	pjm2	1.1	print $sock $xml or die "Could not send UDP packet: $!\n";
303			close($sock);
304			$seq_no++;
305	tdb	1.38	print "-";
306	pjm2	1.12
307			return;
308	pjm2	1.1	}
309
310	pjm2	1.12
311			#-----------------------------------------------------------------------
312			# send_tcp_heartbeat
313			# Establishes a TCP connection to an i-scream filter.
314			# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
315	pjm2	1.34	# If we need to reconfigure, then we complete the heartbeat before
316			# doing so.
317	pjm2	1.12	#-----------------------------------------------------------------------
318	pjm2	1.1	sub send_tcp_heartbeat() {
319
320	pjm2	1.34	my ($doReconfigure) = 0;
321
322	pjm2	1.1	my($sock) = new IO::Socket::INET(
323			PeerAddr => $filter_addr,
324			PeerPort => $tcp_port,
325			Proto => 'tcp'
326	pjm2	1.21	) or return;
327	pjm2	1.11	if (!defined $sock) {
328			print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
329	pjm2	1.27	&tcp_configure();
330	pjm2	1.11	return;
331			}
332	pjm2	1.1
333			# Now run through the configuration process.
334			my($response);
335
336			print $sock "HEARTBEAT\n";
337			$response = <$sock>;
338	pjm2	1.32	if (!$response eq "OK\n") {
339	pjm2	1.1	close($sock);
340			print "Server gave wrong response to HEARTBEAT: $response\n";
341	pjm2	1.27	&tcp_configure();
342	pjm2	1.1	return;
343			}
344
345			print $sock "CONFIG\n";
346			$response = <$sock>;
347	pjm2	1.32	if (!$response eq "OK\n") {
348	pjm2	1.1	close($sock);
349			print "Server gave wrong response to CONFIG: $response\n";
350	pjm2	1.27	&tcp_configure();
351	pjm2	1.1	return;
352			}
353
354			print $sock "$file_list\n";
355			$response = <$sock>;
356	pjm2	1.32	if (!$response eq "OK\n") {
357	pjm2	1.1	close($sock);
358			print "Server gave wrong response to file list: $response\n";
359	pjm2	1.27	&tcp_configure();
360	pjm2	1.1	return;
361			}
362
363			print $sock "$last_modified\n";
364			$response = <$sock>;
365	pjm2	1.32	if ($response eq "ERROR\n") {
366	pjm2	1.1	close($sock);
367	pjm2	1.27	print "Server configuration changed. Reconfiguring with filter manager.\n";
368	pjm2	1.34	$doReconfigure = 1;
369	pjm2	1.1	}
370	pjm2	1.32	if (!$response eq "OK\n") {
371	pjm2	1.1	close($sock);
372			print "Server gave wrong response to HEARTBEAT: $response\n";
373	pjm2	1.27	&tcp_configure();
374	pjm2	1.1	return;
375			}
376
377			print $sock "ENDHEARTBEAT\n";
378	pjm2	1.23	$response = <$sock>;
379	pjm2	1.32	if (!$response eq "OK\n") {
380	pjm2	1.1	close($sock);
381			print "Server gave wrong response to ENDHEARTBEAT: $response\n";
382	pjm2	1.27	&tcp_configure();
383	pjm2	1.1	return;
384			}
385
386			close($sock);
387			print "^";
388	pjm2	1.34
389			&tcp_configure() if $doReconfigure;
390	tdb	1.25
391			return;
392			}
393
394	tdb	1.36
395	tdb	1.25	#-----------------------------------------------------------------------
396			# write_pid
397			# Writes the PID (process ID) of this instance to $pidfile.
398			# This is then used by a seperate script to check (and restart) ihost.
399			#-----------------------------------------------------------------------
400			sub write_pid() {
401			open PID, ">$pidfile";
402			print PID $$;
403			close PID;
404	pjm2	1.12
405			return;
406	tdb	1.36	}
407
408			#-----------------------------------------------------------------------
409			# make_xml
410	tdb	1.37	# Turns an array of plugins data into an XML string.
411	tdb	1.36	#-----------------------------------------------------------------------
412			sub make_xml() {
413			my($curlevel, $curline) = @_;
414			my($xmltemp) = ""; my($curtag) = ""; my($attributes) = "";
415	tdb	1.40	while(1) {
416	tdb	1.43	$curline = shift(@data) if $curline eq "";
417			return $xmltemp if not defined $curline;
418			chomp $curline;
419			# dealing with nest (or attributes)
420	tdb	1.36	if($curline =~ /^$curlevel([^\.\s]+\.)/) {
421			$curtag=$1;
422	tdb	1.43	if($curline =~ /^$curlevel$curtag([^\.\s]+)\s+(.*)$/) {
423			$xmltemp .= &make_xml("$curlevel$curtag", $curline);
424			}
425			elsif($curline =~ /^$curlevel$curtag(attributes)\.([^\.\s]+)\s+(.*)$/) {
426			$attributes .= " $2=\"$3\"";
427			}
428			else {
429			$xmltemp .= &make_xml("$curlevel$curtag", $curline);
430			}
431			my($nextline) = $data[0]; chomp $nextline if defined $nextline;
432	tdb	1.45	$curtag =~ s/(.*)\./$1/;
433			if((defined $nextline) && ($nextline =~ /^$curlevel$curtag\./)) {
434	tdb	1.43	$curline = "";
435			}
436			else {
437			$xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
438			return $xmltemp;
439			}
440	tdb	1.36	}
441	tdb	1.43	# dealing with value
442			elsif($curline =~ /^$curlevel([^\.\s]+)\s+(.*)$/) {
443			$curtag=$1;
444			$xmltemp=$2;
445			my($nextline) = $data[0]; chomp $nextline if defined $nextline;
446			if(defined $nextline && ($nextline =~ /^$curlevel$curtag\./ \|\| $nextline =~ /^$curlevel$curtag\s+/)) {
447			$curline = "";
448			}
449			else {
450			$xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
451			return $xmltemp;
452			}
453	tdb	1.36	}
454	tdb	1.46	# dealing with a null value
455			elsif($curline =~ /^$curlevel([^\.\s]+)$/) {
456			# simply adding a space makes the above elsif deal with it :)
457			# just level with an empty tag in the XML
458			$curline .= " ";
459			}
460			# failing all that, skip the line
461			else {
462			$curline = "";
463			}
464	tdb	1.36	}
465	pjm2	1.1	}