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.  You may adapt the data-gathering
# methods as you see fit.
#  - pjm2@ukc.ac.uk
#
# $Author: pjm2 $
# $Id: ihost.pl,v 1.34 2001/03/22 08:53:59 pjm2 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
            );

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(@statgrab) = `./statgrab.pl`;
    my(%packet);
    for (my($i) = 0; $i <= $#statgrab; $i++) {
        $statgrab[$i] =~ /^([^\s]*) (.*)$/;
        $packet{$1} = $2;
    }
    
    my($date) = time;
    
    my($disk_info) = "<disk>";
    my($i) = 0;
    while (defined $packet{"packet.disk.p$i.attributes.mount"}) {
        $disk_info .= "<p$i";
        $disk_info .= " name=\"" . $packet{"packet.disk.p$i.attributes.name"} . "\"";
        $disk_info .= " kbytes=\"" . $packet{"packet.disk.p$i.attributes.kbytes"} . "\"";
        $disk_info .= " used=\"" . $packet{"packet.disk.p$i.attributes.used"} . "\"";
        $disk_info .= " avail=\"" . $packet{"packet.disk.p$i.attributes.avail"} . "\"";
        $disk_info .= " mount=\"" . $packet{"packet.disk.p$i.attributes.mount"} . "\"";
        $disk_info .= "></p$i>";
        ++$i;
    }
    $disk_info .= "</disk>";

    my($ip);
    $ip = inet_ntoa(scalar(gethostbyname(hostname())) || 'localhost') or $ip = 'localhost';

    # Build the XML packet this way, as we can clearly
    # see the structure and contents... I like this ;-)
    # [Note that the server rejects UDP packets that are
    # larger than 8196 bytes]
    my($xml) = <<EOF;
    
<packet seq_no="$seq_no" machine_name="$fqdn" date="$date" type="data" ip="$ip">
    <load>
        <load1>$packet{"packet.load.load1"}</load1>
        <load5>$packet{"packet.load.load5"}</load5>
        <load15>$packet{"packet.load.load15"}</load15>
    </load>
    <os>
        <name>$packet{"packet.os.name"}</name>
        <release>$packet{"packet.os.release"}</release>
        <platform>$packet{"packet.os.platform"}</platform>
        <sysname>$packet{"packet.os.sysname"}</sysname>
        <version>$packet{"packet.os.version"}</version>
        <uptime>$packet{"packet.os.uptime"}</uptime>
    </os>
    <users>
        <count>$packet{"packet.users.count"}</count>
        <list>$packet{"packet.users.list"}</list>
    </users>
    <processes>
        <total>$packet{"packet.processes.total"}</total>
        <sleeping>$packet{"packet.processes.sleeping"}</sleeping>
        <zombie>$packet{"packet.processes.zombie"}</zombie>
        <stopped>$packet{"packet.processes.stopped"}</stopped>
        <cpu>$packet{"packet.processes.cpu"}</cpu>
    </processes>
    <cpu>
        <idle>$packet{"packet.cpu.idle"}</idle>
        <user>$packet{"packet.cpu.user"}</user>
        <kernel>$packet{"packet.cpu.kernel"}</kernel>
        <iowait>$packet{"packet.cpu.iowait"}</iowait>
        <swap>$packet{"packet.cpu.swap"}</swap>
    </cpu>
    <memory>
        <total>$packet{"packet.memory.total"}</total>
        <free>$packet{"packet.memory.free"}</free>
    </memory>
    <swap>
        <total>$packet{"packet.swap.total"}</total>
        <free>$packet{"packet.swap.free"}</free>
    </swap>
    $disk_info
</packet>

EOF

    # Make the packet smaller by stripping out newlines and leading spaces.
    $xml =~ s/\n\s*//g;

    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;
}
Revision:	1.35
Committed:	Wed Nov 14 14:17:12 2001 UTC (23 years ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.34:	+3 -3 lines
Log Message:	Use the builtin sleep function of perl, at Paul's suggestion.
#	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			# a typical Unix/Linux box. You may adapt the data-gathering
9			# methods as you see fit.
10			# - pjm2@ukc.ac.uk
11			#
12	pjm2	1.28	# $Author: pjm2 $
13	tdb	1.35	# $Id: ihost.pl,v 1.34 2001/03/22 08:53:59 pjm2 Exp $
14	pjm2	1.1	#------------------------------------------------------------
15
16			$\| = 1;
17
18			use strict;
19			use IO::Socket;
20			use Sys::Hostname;
21
22			use vars qw (
23			$filter_manager_addr
24			$filter_manager_port
25			$seq_no
26			$udp_update_time
27			$tcp_update_time
28			$last_udp_time
29			$last_tcp_time
30			$last_modified
31			$udp_port
32			$tcp_port
33			$filter_addr
34			$file_list
35	pjm2	1.17	$fqdn
36	tdb	1.25	$pidfile
37	pjm2	1.28	$retry_wait
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	1.25	# write our PID to a file
51	tdb	1.26	$pidfile = "/var/tmp/ihost.pid";
52	tdb	1.25	&write_pid();
53
54	pjm2	1.1	&tcp_configure();
55			&send_udp_packet();
56
57			$last_udp_time = time;
58			$last_tcp_time = time;
59			while (1) {
60	pjm2	1.9	my($time) = time;
61			if ($time >= $last_udp_time + $udp_update_time) {
62	pjm2	1.1	&send_udp_packet();
63	pjm2	1.9	$last_udp_time = $time;
64	pjm2	1.1	}
65	pjm2	1.9	if ($time >= $last_tcp_time + $tcp_update_time) {
66	pjm2	1.1	&send_tcp_heartbeat();
67	pjm2	1.9	$last_tcp_time = $time;
68	pjm2	1.1	}
69	pjm2	1.9	my($next_udp) = $udp_update_time - $time + $last_udp_time;
70			my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
71			my($delay);
72			if ($next_udp < $next_tcp) {
73			$delay = $next_udp
74			}
75			else {
76			$delay = $next_tcp;
77			}
78	tdb	1.35	sleep $delay;
79	pjm2	1.1	}
80
81	tdb	1.25	# we'll probably never get here...
82			`rm -f $pidfile`;
83	pjm2	1.1	exit(0);
84
85	pjm2	1.12
86			#-----------------------------------------------------------------------
87	pjm2	1.28	# wait_then_retry
88			# Waits for the period of time specified in $retry_wait, then attempts
89			# to reconfigure with the server.
90			#-----------------------------------------------------------------------
91			sub wait_then_retry() {
92			print "Will retry configuration with filter manager in $retry_wait seconds.\n";
93	tdb	1.35	sleep $retry_wait;
94	pjm2	1.28	}
95
96
97			#-----------------------------------------------------------------------
98	pjm2	1.12	# tcp_configure
99			# Establishes a TCP connection to the specified i-scream filter manager.
100			# The host then requests details from the server, such as the intervals
101			# at which to send UDP packets.
102			#-----------------------------------------------------------------------
103	pjm2	1.1	sub tcp_configure() {
104
105	pjm2	1.31	while (1) {
106	pjm2	1.28	my($sock) = new IO::Socket::INET(
107			PeerAddr => $filter_manager_addr,
108			PeerPort => $filter_manager_port,
109			Proto => 'tcp'
110			) or die "Cannot connect!";
111			if (!defined $sock) {
112			print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
113			print "Please check that there is an i-scream server at this address.\n";
114			wait_then_retry();
115			next;
116			}
117
118			# Now run through the configuration process...
119			my($response);
120
121			print $sock "STARTCONFIG\n";
122			$response = <$sock>;
123	pjm2	1.32	if ($response && !($response eq "OK\n")) {
124			print "The i-scream server rejected the STARTCONFIG command.\n";
125	pjm2	1.28	close($sock);
126			wait_then_retry();
127			next;
128			}
129
130			print "Config started okay.\n";
131
132			print $sock "LASTMODIFIED\n";
133			$response = <$sock>;
134	pjm2	1.32	if (!$response) {
135			print "The i-scream server did not return anything for the LASTMODIFIED command.\n";
136			close($sock);
137			wait_then_retry();
138			next;
139			}
140	pjm2	1.28	chop $response;
141			$last_modified = $response;
142
143			print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
144
145			print $sock "FILELIST\n";
146			$response = <$sock>;
147	pjm2	1.32	if (!$response) {
148			print "The i-scream server did not provide a configuration file list.\n";
149			close($sock);
150			wait_then_retry();
151			next;
152			}
153	pjm2	1.28	chop $response;
154			$file_list = $response;
155
156			print "File list obtained: $file_list\n";
157
158			print $sock "FQDN\n";
159			$response = <$sock>;
160	pjm2	1.32	if (!$response) {
161			print "The i-scream server did not tell us our FQDN.\n";
162			close($sock);
163			wait_then_retry();
164			next;
165			}
166	pjm2	1.28	chop $response;
167			$fqdn = $response;
168
169			print "FQDN returned: $fqdn\n";
170
171			print $sock "UDPUpdateTime\n";
172			$response = <$sock>;
173	pjm2	1.32	if (!$response) {
174			print "The i-scream server did not give us a UDPUpdateTime.\n";
175			close($sock);
176			wait_then_retry();
177			next;
178			}
179	pjm2	1.28	chop $response;
180			$udp_update_time = $response;
181
182			print $sock "TCPUpdateTime\n";
183			$response = <$sock>;
184	pjm2	1.32	if (!$response) {
185			print "The i-scream server did not give us a TCPUpdateTime.\n";
186			close($sock);
187			wait_then_retry();
188			next;
189			}
190	pjm2	1.28	chop $response;
191			$tcp_update_time = $response;
192
193			print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
194
195			print $sock "ENDCONFIG\n";
196			$response = <$sock>;
197	pjm2	1.32	if ($response && !($response eq "OK\n")) {
198	pjm2	1.28	print "ENDCONFIG command to server failed. Terminated.\n";
199			close($sock);
200			wait_then_retry();
201			next;
202			}
203
204			print "Config ended.\n";
205
206			print $sock "FILTER\n";
207			$response = <$sock>;
208	pjm2	1.32	if (!$response) {
209	pjm2	1.28	print "Failed: Could not get a filter address from the filter manager.\n";
210			close($sock);
211			wait_then_retry();
212			next;
213			}
214			chop $response;
215	pjm2	1.32	$response =~ /^(.);(.);(.*)/;
216	pjm2	1.28	if ($response eq "ERROR") {
217			print "There are no active configured filters for your host.\n";
218			close($sock);
219			wait_then_retry();
220			next;
221			}
222			($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
223			unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) {
224			print "Failed: Filter address response from server did not make sense: $response\n";
225			close($sock);
226			wait_then_retry();
227			next;
228			}
229
230			print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
231
232			print $sock "END\n";
233			$response = <$sock>;
234	pjm2	1.32	if ($response && ($response eq "OK\n")) {
235	pjm2	1.28	print "Host successfully configured via TCP.\n"
236			}
237			else {
238	pjm2	1.32	print "The server failed the host configuration on the END command.\n";
239	pjm2	1.28	close($sock);
240			wait_then_retry();
241			next;
242			}
243	pjm2	1.1
244	pjm2	1.28	close($sock);
245	pjm2	1.1
246	pjm2	1.28	print "Configuration finished sucessfully!\n";
247			last;
248	pjm2	1.1	}
249	pjm2	1.12	return;
250	pjm2	1.1	}
251
252	pjm2	1.12
253
254
255			#-----------------------------------------------------------------------
256			# send_udp_packet
257			# Sends a UDP packet to an i-scream filter.
258			# The packet contains XML markup describing some of the machine's state.
259			# Receipt of UDP packets is not guaranteed.
260			#-----------------------------------------------------------------------
261	pjm2	1.1	sub send_udp_packet() {
262
263			my(@statgrab) = `./statgrab.pl`;
264			my(%packet);
265	pjm2	1.13	for (my($i) = 0; $i <= $#statgrab; $i++) {
266	pjm2	1.1	$statgrab[$i] =~ /^([^\s]) (.)$/;
267			$packet{$1} = $2;
268			}
269
270			my($date) = time;
271
272			my($disk_info) = "<disk>";
273			my($i) = 0;
274			while (defined $packet{"packet.disk.p$i.attributes.mount"}) {
275	pjm2	1.15	$disk_info .= "<p$i";
276			$disk_info .= " name=\"" . $packet{"packet.disk.p$i.attributes.name"} . "\"";
277			$disk_info .= " kbytes=\"" . $packet{"packet.disk.p$i.attributes.kbytes"} . "\"";
278			$disk_info .= " used=\"" . $packet{"packet.disk.p$i.attributes.used"} . "\"";
279			$disk_info .= " avail=\"" . $packet{"packet.disk.p$i.attributes.avail"} . "\"";
280			$disk_info .= " mount=\"" . $packet{"packet.disk.p$i.attributes.mount"} . "\"";
281			$disk_info .= "></p$i>";
282	pjm2	1.1	++$i;
283			}
284			$disk_info .= "</disk>";
285	pjm2	1.13
286	pjm2	1.33	my($ip);
287			$ip = inet_ntoa(scalar(gethostbyname(hostname())) \|\| 'localhost') or $ip = 'localhost';
288	pjm2	1.1
289			# Build the XML packet this way, as we can clearly
290			# see the structure and contents... I like this ;-)
291	pjm2	1.12	# [Note that the server rejects UDP packets that are
292			# larger than 8196 bytes]
293	pjm2	1.1	my($xml) = <<EOF;
294
295	tdb	1.19	<packet seq_no="$seq_no" machine_name="$fqdn" date="$date" type="data" ip="$ip">
296	pjm2	1.1	<load>
297			<load1>$packet{"packet.load.load1"}</load1>
298			<load5>$packet{"packet.load.load5"}</load5>
299			<load15>$packet{"packet.load.load15"}</load15>
300			</load>
301			<os>
302			<name>$packet{"packet.os.name"}</name>
303			<release>$packet{"packet.os.release"}</release>
304			<platform>$packet{"packet.os.platform"}</platform>
305			<sysname>$packet{"packet.os.sysname"}</sysname>
306			<version>$packet{"packet.os.version"}</version>
307	tdb	1.10	<uptime>$packet{"packet.os.uptime"}</uptime>
308	pjm2	1.1	</os>
309			<users>
310			<count>$packet{"packet.users.count"}</count>
311			<list>$packet{"packet.users.list"}</list>
312			</users>
313			<processes>
314			<total>$packet{"packet.processes.total"}</total>
315			<sleeping>$packet{"packet.processes.sleeping"}</sleeping>
316			<zombie>$packet{"packet.processes.zombie"}</zombie>
317			<stopped>$packet{"packet.processes.stopped"}</stopped>
318			<cpu>$packet{"packet.processes.cpu"}</cpu>
319			</processes>
320			<cpu>
321			<idle>$packet{"packet.cpu.idle"}</idle>
322			<user>$packet{"packet.cpu.user"}</user>
323			<kernel>$packet{"packet.cpu.kernel"}</kernel>
324			<iowait>$packet{"packet.cpu.iowait"}</iowait>
325			<swap>$packet{"packet.cpu.swap"}</swap>
326			</cpu>
327			<memory>
328	pjm2	1.13	<total>$packet{"packet.memory.total"}</total>
329	pjm2	1.1	<free>$packet{"packet.memory.free"}</free>
330			</memory>
331			<swap>
332	pjm2	1.13	<total>$packet{"packet.swap.total"}</total>
333			<free>$packet{"packet.swap.free"}</free>
334	pjm2	1.1	</swap>
335			$disk_info
336			</packet>
337
338			EOF
339
340	pjm2	1.12	# Make the packet smaller by stripping out newlines and leading spaces.
341	pjm2	1.1	$xml =~ s/\n\s*//g;
342	tdb	1.19
343	pjm2	1.1	my($sock) = new IO::Socket::INET (
344			PeerPort => $udp_port,
345			PeerAddr => $filter_addr,
346			Proto => 'udp'
347	pjm2	1.21	) or die "Could not send UDP: $!\n";
348	pjm2	1.1
349			print $sock $xml or die "Could not send UDP packet: $!\n";
350			close($sock);
351			$seq_no++;
352			print "-";
353	pjm2	1.12
354			return;
355	pjm2	1.1	}
356
357	pjm2	1.12
358
359
360			#-----------------------------------------------------------------------
361			# send_tcp_heartbeat
362			# Establishes a TCP connection to an i-scream filter.
363			# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
364	pjm2	1.34	# If we need to reconfigure, then we complete the heartbeat before
365			# doing so.
366	pjm2	1.12	#-----------------------------------------------------------------------
367	pjm2	1.1	sub send_tcp_heartbeat() {
368
369	pjm2	1.34	my ($doReconfigure) = 0;
370
371	pjm2	1.1	my($sock) = new IO::Socket::INET(
372			PeerAddr => $filter_addr,
373			PeerPort => $tcp_port,
374			Proto => 'tcp'
375	pjm2	1.21	) or return;
376	pjm2	1.11	if (!defined $sock) {
377			print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
378	pjm2	1.27	&tcp_configure();
379	pjm2	1.11	return;
380			}
381	pjm2	1.1
382			# Now run through the configuration process.
383			my($response);
384
385			print $sock "HEARTBEAT\n";
386			$response = <$sock>;
387	pjm2	1.32	if (!$response eq "OK\n") {
388	pjm2	1.1	close($sock);
389			print "Server gave wrong response to HEARTBEAT: $response\n";
390	pjm2	1.27	&tcp_configure();
391	pjm2	1.1	return;
392			}
393
394			print $sock "CONFIG\n";
395			$response = <$sock>;
396	pjm2	1.32	if (!$response eq "OK\n") {
397	pjm2	1.1	close($sock);
398			print "Server gave wrong response to CONFIG: $response\n";
399	pjm2	1.27	&tcp_configure();
400	pjm2	1.1	return;
401			}
402
403			print $sock "$file_list\n";
404			$response = <$sock>;
405	pjm2	1.32	if (!$response eq "OK\n") {
406	pjm2	1.1	close($sock);
407			print "Server gave wrong response to file list: $response\n";
408	pjm2	1.27	&tcp_configure();
409	pjm2	1.1	return;
410			}
411
412			print $sock "$last_modified\n";
413			$response = <$sock>;
414	pjm2	1.32	if ($response eq "ERROR\n") {
415	pjm2	1.1	close($sock);
416	pjm2	1.27	print "Server configuration changed. Reconfiguring with filter manager.\n";
417	pjm2	1.34	$doReconfigure = 1;
418	pjm2	1.1	}
419	pjm2	1.32	if (!$response eq "OK\n") {
420	pjm2	1.1	close($sock);
421			print "Server gave wrong response to HEARTBEAT: $response\n";
422	pjm2	1.27	&tcp_configure();
423	pjm2	1.1	return;
424			}
425
426			print $sock "ENDHEARTBEAT\n";
427	pjm2	1.23	$response = <$sock>;
428	pjm2	1.32	if (!$response eq "OK\n") {
429	pjm2	1.1	close($sock);
430			print "Server gave wrong response to ENDHEARTBEAT: $response\n";
431	pjm2	1.27	&tcp_configure();
432	pjm2	1.1	return;
433			}
434
435			close($sock);
436			print "^";
437	pjm2	1.34
438			&tcp_configure() if $doReconfigure;
439	tdb	1.25
440			return;
441			}
442
443			#-----------------------------------------------------------------------
444			# write_pid
445			# Writes the PID (process ID) of this instance to $pidfile.
446			# This is then used by a seperate script to check (and restart) ihost.
447			#-----------------------------------------------------------------------
448			sub write_pid() {
449			open PID, ">$pidfile";
450			print PID $$;
451			close PID;
452	pjm2	1.12
453			return;
454	pjm2	1.1	}