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 1.47 2002/03/21 17:57:13 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
             $key
             @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_tcp_heartbeat();
&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 || $response eq "ERROR\n") {
            print "The i-scream server did not provide the LASTMODIFIED value.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chomp $response;
        $last_modified = $response;
    
        print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";

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

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

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

        print "FQDN returned: $fqdn\n";

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

        print $sock "TCPUpdateTime\n";
        $response = <$sock>;
        if (!$response || $response eq "ERROR\n") {
            print "The i-scream server did not give us a TCPUpdateTime.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        chomp $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;
        }
        chomp $response;
        if ($response eq "ERROR") {
            print "There are no active configured filters for your host.\n";
            close($sock);
            wait_then_retry();
            next;
        }
        $response =~ /^(.*);(.*);(.*)/;
        ($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");
    push(@data, "packet.attributes.key $key");
    
    # 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 "KEY\n";
    $key = <$sock>;
    
    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:	1.48
Committed:	Sat May 11 17:20:07 2002 UTC (22 years, 6 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.47:	+14 -14 lines
Log Message:	Now conforms more strictly to the protocol spec. Also uses chomp instead of chop to strip the \n from server messages - it seems safer.
#	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	1.48	# $Id: ihost.pl,v 1.47 2002/03/21 17:57:13 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	1.47	$key
38	tdb	1.37	@data
39	pjm2	1.1	);
40
41			if (@ARGV != 2) {
42			die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n";
43			}
44
45			$filter_manager_addr = $ARGV[0];
46			$filter_manager_port = $ARGV[1];
47
48			$seq_no = 1;
49	pjm2	1.33	$retry_wait = 60;
50	pjm2	1.1
51	tdb	1.44	# work out our platform, if we can.
52			$ostype = `uname -s`;
53			chomp $ostype;
54			$ostype = "unknown" if not defined $ostype;
55
56	tdb	1.25	# write our PID to a file
57	tdb	1.41	# use home dir by default
58	tdb	1.42	#$pidfile = $ENV{"HOME"};
59	tdb	1.41	# or drop it in /var/tmp if we can't find HOME
60			$pidfile = "/var/tmp" if not defined $pidfile;
61			$pidfile .= "/.ihost.pid";
62	tdb	1.25	&write_pid();
63
64	pjm2	1.1	&tcp_configure();
65	tdb	1.47	&send_tcp_heartbeat();
66	pjm2	1.1	&send_udp_packet();
67
68			$last_udp_time = time;
69			$last_tcp_time = time;
70			while (1) {
71	pjm2	1.9	my($time) = time;
72			if ($time >= $last_udp_time + $udp_update_time) {
73	pjm2	1.1	&send_udp_packet();
74	pjm2	1.9	$last_udp_time = $time;
75	pjm2	1.1	}
76	pjm2	1.9	if ($time >= $last_tcp_time + $tcp_update_time) {
77	pjm2	1.1	&send_tcp_heartbeat();
78	pjm2	1.9	$last_tcp_time = $time;
79	pjm2	1.1	}
80	pjm2	1.9	my($next_udp) = $udp_update_time - $time + $last_udp_time;
81			my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
82			my($delay);
83			if ($next_udp < $next_tcp) {
84			$delay = $next_udp
85			}
86			else {
87			$delay = $next_tcp;
88			}
89	tdb	1.35	sleep $delay;
90	pjm2	1.1	}
91
92	tdb	1.25	# we'll probably never get here...
93			`rm -f $pidfile`;
94	pjm2	1.1	exit(0);
95
96	pjm2	1.12
97			#-----------------------------------------------------------------------
98	pjm2	1.28	# wait_then_retry
99			# Waits for the period of time specified in $retry_wait, then attempts
100			# to reconfigure with the server.
101			#-----------------------------------------------------------------------
102			sub wait_then_retry() {
103			print "Will retry configuration with filter manager in $retry_wait seconds.\n";
104	tdb	1.35	sleep $retry_wait;
105	pjm2	1.28	}
106
107
108			#-----------------------------------------------------------------------
109	pjm2	1.12	# tcp_configure
110			# Establishes a TCP connection to the specified i-scream filter manager.
111			# The host then requests details from the server, such as the intervals
112			# at which to send UDP packets.
113			#-----------------------------------------------------------------------
114	pjm2	1.1	sub tcp_configure() {
115
116	pjm2	1.31	while (1) {
117	pjm2	1.28	my($sock) = new IO::Socket::INET(
118			PeerAddr => $filter_manager_addr,
119			PeerPort => $filter_manager_port,
120			Proto => 'tcp'
121			) or die "Cannot connect!";
122			if (!defined $sock) {
123			print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
124			print "Please check that there is an i-scream server at this address.\n";
125			wait_then_retry();
126			next;
127			}
128
129			# Now run through the configuration process...
130			my($response);
131
132			print $sock "STARTCONFIG\n";
133			$response = <$sock>;
134	pjm2	1.32	if ($response && !($response eq "OK\n")) {
135			print "The i-scream server rejected the STARTCONFIG command.\n";
136	pjm2	1.28	close($sock);
137			wait_then_retry();
138			next;
139			}
140
141			print "Config started okay.\n";
142
143			print $sock "LASTMODIFIED\n";
144			$response = <$sock>;
145	tdb	1.48	if (!$response \|\| $response eq "ERROR\n") {
146			print "The i-scream server did not provide the LASTMODIFIED value.\n";
147	pjm2	1.32	close($sock);
148			wait_then_retry();
149			next;
150			}
151	tdb	1.48	chomp $response;
152	pjm2	1.28	$last_modified = $response;
153
154			print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
155
156			print $sock "FILELIST\n";
157			$response = <$sock>;
158	tdb	1.48	if (!$response \|\| $response eq "ERROR\n") {
159	pjm2	1.32	print "The i-scream server did not provide a configuration file list.\n";
160			close($sock);
161			wait_then_retry();
162			next;
163			}
164	tdb	1.48	chomp $response;
165	pjm2	1.28	$file_list = $response;
166
167			print "File list obtained: $file_list\n";
168
169			print $sock "FQDN\n";
170			$response = <$sock>;
171	tdb	1.48	if (!$response \|\| $response eq "ERROR\n") {
172	pjm2	1.32	print "The i-scream server did not tell us our FQDN.\n";
173			close($sock);
174			wait_then_retry();
175			next;
176			}
177	tdb	1.48	chomp $response;
178	pjm2	1.28	$fqdn = $response;
179
180			print "FQDN returned: $fqdn\n";
181
182			print $sock "UDPUpdateTime\n";
183			$response = <$sock>;
184	tdb	1.48	if (!$response \|\| $response eq "ERROR\n") {
185	pjm2	1.32	print "The i-scream server did not give us a UDPUpdateTime.\n";
186			close($sock);
187			wait_then_retry();
188			next;
189			}
190	tdb	1.48	chomp $response;
191	pjm2	1.28	$udp_update_time = $response;
192
193			print $sock "TCPUpdateTime\n";
194			$response = <$sock>;
195	tdb	1.48	if (!$response \|\| $response eq "ERROR\n") {
196	pjm2	1.32	print "The i-scream server did not give us a TCPUpdateTime.\n";
197			close($sock);
198			wait_then_retry();
199			next;
200			}
201	tdb	1.48	chomp $response;
202	pjm2	1.28	$tcp_update_time = $response;
203
204			print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
205
206			print $sock "ENDCONFIG\n";
207			$response = <$sock>;
208	pjm2	1.32	if ($response && !($response eq "OK\n")) {
209	pjm2	1.28	print "ENDCONFIG command to server failed. Terminated.\n";
210			close($sock);
211			wait_then_retry();
212			next;
213			}
214
215			print "Config ended.\n";
216
217			print $sock "FILTER\n";
218			$response = <$sock>;
219	pjm2	1.32	if (!$response) {
220	pjm2	1.28	print "Failed: Could not get a filter address from the filter manager.\n";
221			close($sock);
222			wait_then_retry();
223			next;
224			}
225	tdb	1.48	chomp $response;
226	pjm2	1.28	if ($response eq "ERROR") {
227			print "There are no active configured filters for your host.\n";
228			close($sock);
229			wait_then_retry();
230			next;
231			}
232	tdb	1.48	$response =~ /^(.);(.);(.*)/;
233	pjm2	1.28	($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
234			unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) {
235			print "Failed: Filter address response from server did not make sense: $response\n";
236			close($sock);
237			wait_then_retry();
238			next;
239			}
240
241			print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
242
243			print $sock "END\n";
244			$response = <$sock>;
245	pjm2	1.32	if ($response && ($response eq "OK\n")) {
246	pjm2	1.28	print "Host successfully configured via TCP.\n"
247			}
248			else {
249	pjm2	1.32	print "The server failed the host configuration on the END command.\n";
250	pjm2	1.28	close($sock);
251			wait_then_retry();
252			next;
253			}
254	pjm2	1.1
255	pjm2	1.28	close($sock);
256	pjm2	1.1
257	pjm2	1.28	print "Configuration finished sucessfully!\n";
258			last;
259	pjm2	1.1	}
260	pjm2	1.12	return;
261	pjm2	1.1	}
262
263	pjm2	1.12
264			#-----------------------------------------------------------------------
265			# send_udp_packet
266			# Sends a UDP packet to an i-scream filter.
267			# The packet contains XML markup describing some of the machine's state.
268			# Receipt of UDP packets is not guaranteed.
269			#-----------------------------------------------------------------------
270	pjm2	1.1	sub send_udp_packet() {
271
272	tdb	1.37	my($plugins_dir) = "plugins";
273
274			opendir PLUGINS, $plugins_dir;
275			my(@plugins) = readdir PLUGINS;
276			foreach my $plugin (@plugins) {
277	tdb	1.44	push @data, `$plugins_dir/$plugin $ostype` if -x "$plugins_dir/$plugin" && -f "$plugins_dir/$plugin";
278	tdb	1.37	}
279	pjm2	1.1
280	tdb	1.36	# get some extra data
281	pjm2	1.1	my($date) = time;
282	pjm2	1.33	my($ip);
283			$ip = inet_ntoa(scalar(gethostbyname(hostname())) \|\| 'localhost') or $ip = 'localhost';
284	tdb	1.36
285			# add some extra data to the array
286	tdb	1.43	push(@data, "packet.attributes.seq_no $seq_no");
287			push(@data, "packet.attributes.machine_name $fqdn");
288			push(@data, "packet.attributes.date $date");
289			push(@data, "packet.attributes.type data");
290			push(@data, "packet.attributes.ip $ip");
291	tdb	1.47	push(@data, "packet.attributes.key $key");
292	tdb	1.39
293			# sort the data
294	tdb	1.43	@data = sort(grep(!/^$/, grep(/^packet\./, @data)));
295
296	tdb	1.36	# turn the array into some nice XML
297			my($xml) = &make_xml("", "");
298	tdb	1.43
299	pjm2	1.1	my($sock) = new IO::Socket::INET (
300			PeerPort => $udp_port,
301			PeerAddr => $filter_addr,
302			Proto => 'udp'
303	pjm2	1.21	) or die "Could not send UDP: $!\n";
304	tdb	1.36
305	pjm2	1.1	print $sock $xml or die "Could not send UDP packet: $!\n";
306			close($sock);
307			$seq_no++;
308	tdb	1.38	print "-";
309	pjm2	1.12
310			return;
311	pjm2	1.1	}
312
313	pjm2	1.12
314			#-----------------------------------------------------------------------
315			# send_tcp_heartbeat
316			# Establishes a TCP connection to an i-scream filter.
317			# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
318	pjm2	1.34	# If we need to reconfigure, then we complete the heartbeat before
319			# doing so.
320	pjm2	1.12	#-----------------------------------------------------------------------
321	pjm2	1.1	sub send_tcp_heartbeat() {
322
323	pjm2	1.34	my ($doReconfigure) = 0;
324
325	pjm2	1.1	my($sock) = new IO::Socket::INET(
326			PeerAddr => $filter_addr,
327			PeerPort => $tcp_port,
328			Proto => 'tcp'
329	pjm2	1.21	) or return;
330	pjm2	1.11	if (!defined $sock) {
331			print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
332	pjm2	1.27	&tcp_configure();
333	pjm2	1.11	return;
334			}
335	pjm2	1.1
336			# Now run through the configuration process.
337			my($response);
338
339			print $sock "HEARTBEAT\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 HEARTBEAT: $response\n";
344	pjm2	1.27	&tcp_configure();
345	pjm2	1.1	return;
346			}
347
348			print $sock "CONFIG\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 CONFIG: $response\n";
353	pjm2	1.27	&tcp_configure();
354	pjm2	1.1	return;
355			}
356
357			print $sock "$file_list\n";
358			$response = <$sock>;
359	pjm2	1.32	if (!$response eq "OK\n") {
360	pjm2	1.1	close($sock);
361			print "Server gave wrong response to file list: $response\n";
362	pjm2	1.27	&tcp_configure();
363	pjm2	1.1	return;
364			}
365
366			print $sock "$last_modified\n";
367			$response = <$sock>;
368	pjm2	1.32	if ($response eq "ERROR\n") {
369	pjm2	1.1	close($sock);
370	pjm2	1.27	print "Server configuration changed. Reconfiguring with filter manager.\n";
371	pjm2	1.34	$doReconfigure = 1;
372	pjm2	1.1	}
373	pjm2	1.32	if (!$response eq "OK\n") {
374	pjm2	1.1	close($sock);
375			print "Server gave wrong response to HEARTBEAT: $response\n";
376	pjm2	1.27	&tcp_configure();
377	pjm2	1.1	return;
378			}
379	tdb	1.47
380			print $sock "KEY\n";
381			$key = <$sock>;
382	pjm2	1.1
383			print $sock "ENDHEARTBEAT\n";
384	pjm2	1.23	$response = <$sock>;
385	pjm2	1.32	if (!$response eq "OK\n") {
386	pjm2	1.1	close($sock);
387			print "Server gave wrong response to ENDHEARTBEAT: $response\n";
388	pjm2	1.27	&tcp_configure();
389	pjm2	1.1	return;
390			}
391
392			close($sock);
393			print "^";
394	pjm2	1.34
395			&tcp_configure() if $doReconfigure;
396	tdb	1.25
397			return;
398			}
399
400	tdb	1.36
401	tdb	1.25	#-----------------------------------------------------------------------
402			# write_pid
403			# Writes the PID (process ID) of this instance to $pidfile.
404			# This is then used by a seperate script to check (and restart) ihost.
405			#-----------------------------------------------------------------------
406			sub write_pid() {
407			open PID, ">$pidfile";
408			print PID $$;
409			close PID;
410	pjm2	1.12
411			return;
412	tdb	1.36	}
413
414			#-----------------------------------------------------------------------
415			# make_xml
416	tdb	1.37	# Turns an array of plugins data into an XML string.
417	tdb	1.36	#-----------------------------------------------------------------------
418			sub make_xml() {
419			my($curlevel, $curline) = @_;
420			my($xmltemp) = ""; my($curtag) = ""; my($attributes) = "";
421	tdb	1.40	while(1) {
422	tdb	1.43	$curline = shift(@data) if $curline eq "";
423			return $xmltemp if not defined $curline;
424			chomp $curline;
425			# dealing with nest (or attributes)
426	tdb	1.36	if($curline =~ /^$curlevel([^\.\s]+\.)/) {
427			$curtag=$1;
428	tdb	1.43	if($curline =~ /^$curlevel$curtag([^\.\s]+)\s+(.*)$/) {
429			$xmltemp .= &make_xml("$curlevel$curtag", $curline);
430			}
431			elsif($curline =~ /^$curlevel$curtag(attributes)\.([^\.\s]+)\s+(.*)$/) {
432			$attributes .= " $2=\"$3\"";
433			}
434			else {
435			$xmltemp .= &make_xml("$curlevel$curtag", $curline);
436			}
437			my($nextline) = $data[0]; chomp $nextline if defined $nextline;
438	tdb	1.45	$curtag =~ s/(.*)\./$1/;
439			if((defined $nextline) && ($nextline =~ /^$curlevel$curtag\./)) {
440	tdb	1.43	$curline = "";
441			}
442			else {
443			$xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
444			return $xmltemp;
445			}
446	tdb	1.36	}
447	tdb	1.43	# dealing with value
448			elsif($curline =~ /^$curlevel([^\.\s]+)\s+(.*)$/) {
449			$curtag=$1;
450			$xmltemp=$2;
451			my($nextline) = $data[0]; chomp $nextline if defined $nextline;
452			if(defined $nextline && ($nextline =~ /^$curlevel$curtag\./ \|\| $nextline =~ /^$curlevel$curtag\s+/)) {
453			$curline = "";
454			}
455			else {
456			$xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq "";
457			return $xmltemp;
458			}
459	tdb	1.36	}
460	tdb	1.46	# dealing with a null value
461			elsif($curline =~ /^$curlevel([^\.\s]+)$/) {
462			# simply adding a space makes the above elsif deal with it :)
463			# just level with an empty tag in the XML
464			$curline .= " ";
465			}
466			# failing all that, skip the line
467			else {
468			$curline = "";
469			}
470	tdb	1.36	}
471	pjm2	1.1	}