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 1.22 2001/03/01 10:49:27 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
            );

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;

&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`;
}

exit(0);


#-----------------------------------------------------------------------
# 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() {
    
    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";
        print "Program ended.\n";
        exit(1);
    }

    # Now run through the configuration process...
    my($response);
    
    print $sock "STARTCONFIG\n";
    $response = <$sock>;
    if (!chop $response eq "OK") {
        print "The i-scream server rejected the STARTCONFIG command.  Terminated.";
        exit(1);
    }

    print "Config started okay.\n";
    
    print $sock "LASTMODIFIED\n";
    $response = <$sock>;
    chop $response;
    $last_modified = $response;
    
    print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";

    print $sock "FILELIST\n";
    $response = <$sock>;
    chop $response;
    $file_list = $response;

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

    print $sock "FQDN\n";
    $response = <$sock>;
    chop $response;
    $fqdn = $response;

    print "FQDN returned: $fqdn\n";

    print $sock "UDPUpdateTime\n";
    $response = <$sock>;
    chop $response;
    $udp_update_time = $response;

    print $sock "TCPUpdateTime\n";
    $response = <$sock>;
    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>;
    chomp $response;
    if (!$response eq "OK") {
        print "ENDCONFIG command to server failed.  Terminated.\n";
        exit(1);
    }

    print "Config ended.\n";
    
    print $sock "FILTER\n";
    $response = <$sock>;
    chop $response;
    $response =~ /(.*);(.*);(.*)/;
    ($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
    
    print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";

    print $sock "END\n";
    $response = <$sock>;
    chop $response;
    if ($response eq "OK") {
        print "Host successfully configured via TCP.\n"
    }
    else {
        print "The server failed the host configuration on the END command.";
        exit(1);
    }
    
    close($sock);

    print "Configuration finished sucessfully!\n";
    
    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) = inet_ntoa(scalar(gethostbyname(hostname())) || '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.
#-----------------------------------------------------------------------
sub send_tcp_heartbeat() {

    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";
        return;
    }

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

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

    print $sock "$file_list\n";
    $response = <$sock>;
    return if (!defined $response);
    chop $response;
    if (!$response eq "OK") {
        close($sock);
        print "Server gave wrong response to file list: $response\n";
        return;
    }
    
    print $sock "$last_modified\n";
    $response = <$sock>;
    return if (!defined $response);
    chop $response;
    if ($response eq "ERROR") {
        close($sock);
        &tcp_configure();
        return;
    }
    if (!$response eq "OK") {
        close($sock);
        print "Server gave wrong response to HEARTBEAT: $response\n";
        return;
    }
    
    print $sock "ENDHEARTBEAT\n";
    $response = <$sock>;
    return if (!defined $response);
    chop $response;
    if (!$response eq "OK") {
        close($sock);
        print "Server gave wrong response to ENDHEARTBEAT: $response\n";
        return;
    }
    
    close($sock);
    print "^";
    
    return;
}
Revision:	1.23
Committed:	Thu Mar 1 18:53:42 2001 UTC (24 years, 8 months ago) by pjm2
Content type:	text/plain
Branch:	MAIN
Changes since 1.22:	+11 -6 lines
Log Message:	Changed the way in which the host behaves when the server goes down mid-heartbeat. It shouldn't complain; it will just silently withdraw.
#	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	1.22	# $Author: pjm2 $
13	pjm2	1.23	# $Id: ihost.pl,v 1.22 2001/03/01 10:49:27 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	pjm2	1.1	);
37
38			if (@ARGV != 2) {
39			die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n";
40			}
41
42			$filter_manager_addr = $ARGV[0];
43			$filter_manager_port = $ARGV[1];
44
45			$seq_no = 1;
46
47			&tcp_configure();
48			&send_udp_packet();
49
50			$last_udp_time = time;
51			$last_tcp_time = time;
52			while (1) {
53	pjm2	1.9	my($time) = time;
54			if ($time >= $last_udp_time + $udp_update_time) {
55	pjm2	1.1	&send_udp_packet();
56	pjm2	1.9	$last_udp_time = $time;
57	pjm2	1.1	}
58	pjm2	1.9	if ($time >= $last_tcp_time + $tcp_update_time) {
59	pjm2	1.1	&send_tcp_heartbeat();
60	pjm2	1.9	$last_tcp_time = $time;
61	pjm2	1.1	}
62	pjm2	1.9	my($next_udp) = $udp_update_time - $time + $last_udp_time;
63			my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
64			my($delay);
65			if ($next_udp < $next_tcp) {
66			$delay = $next_udp
67			}
68			else {
69			$delay = $next_tcp;
70			}
71			`sleep $delay`;
72	pjm2	1.1	}
73
74			exit(0);
75
76	pjm2	1.12
77			#-----------------------------------------------------------------------
78			# tcp_configure
79			# Establishes a TCP connection to the specified i-scream filter manager.
80			# The host then requests details from the server, such as the intervals
81			# at which to send UDP packets.
82			#-----------------------------------------------------------------------
83	pjm2	1.1	sub tcp_configure() {
84
85			my($sock) = new IO::Socket::INET(
86			PeerAddr => $filter_manager_addr,
87			PeerPort => $filter_manager_port,
88			Proto => 'tcp'
89	pjm2	1.21	) or die "Cannot connect!";
90	pjm2	1.11	if (!defined $sock) {
91			print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
92			print "Please check that there is an i-scream server at this address.\n";
93			print "Program ended.\n";
94			exit(1);
95			}
96	pjm2	1.1
97	pjm2	1.12	# Now run through the configuration process...
98	pjm2	1.1	my($response);
99
100			print $sock "STARTCONFIG\n";
101			$response = <$sock>;
102			if (!chop $response eq "OK") {
103			print "The i-scream server rejected the STARTCONFIG command. Terminated.";
104			exit(1);
105			}
106
107			print "Config started okay.\n";
108
109			print $sock "LASTMODIFIED\n";
110			$response = <$sock>;
111			chop $response;
112			$last_modified = $response;
113
114	pjm2	1.7	print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
115	pjm2	1.1
116			print $sock "FILELIST\n";
117			$response = <$sock>;
118			chop $response;
119			$file_list = $response;
120
121			print "File list obtained: $file_list\n";
122	pjm2	1.17
123			print $sock "FQDN\n";
124			$response = <$sock>;
125			chop $response;
126			$fqdn = $response;
127
128			print "FQDN returned: $fqdn\n";
129	pjm2	1.1
130			print $sock "UDPUpdateTime\n";
131			$response = <$sock>;
132			chop $response;
133			$udp_update_time = $response;
134
135			print $sock "TCPUpdateTime\n";
136			$response = <$sock>;
137			chop $response;
138			$tcp_update_time = $response;
139
140	pjm2	1.7	print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
141	pjm2	1.1
142			print $sock "ENDCONFIG\n";
143			$response = <$sock>;
144			chomp $response;
145			if (!$response eq "OK") {
146			print "ENDCONFIG command to server failed. Terminated.\n";
147			exit(1);
148			}
149
150			print "Config ended.\n";
151
152			print $sock "FILTER\n";
153			$response = <$sock>;
154			chop $response;
155			$response =~ /(.);(.);(.*)/;
156			($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
157
158			print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
159
160			print $sock "END\n";
161			$response = <$sock>;
162			chop $response;
163			if ($response eq "OK") {
164			print "Host successfully configured via TCP.\n"
165			}
166			else {
167			print "The server failed the host configuration on the END command.";
168			exit(1);
169			}
170
171			close($sock);
172
173			print "Configuration finished sucessfully!\n";
174	pjm2	1.12
175			return;
176	pjm2	1.1	}
177
178	pjm2	1.12
179
180
181			#-----------------------------------------------------------------------
182			# send_udp_packet
183			# Sends a UDP packet to an i-scream filter.
184			# The packet contains XML markup describing some of the machine's state.
185			# Receipt of UDP packets is not guaranteed.
186			#-----------------------------------------------------------------------
187	pjm2	1.1	sub send_udp_packet() {
188
189			my(@statgrab) = `./statgrab.pl`;
190			my(%packet);
191	pjm2	1.13	for (my($i) = 0; $i <= $#statgrab; $i++) {
192	pjm2	1.1	$statgrab[$i] =~ /^([^\s]) (.)$/;
193			$packet{$1} = $2;
194			}
195
196			my($date) = time;
197
198			my($disk_info) = "<disk>";
199			my($i) = 0;
200			while (defined $packet{"packet.disk.p$i.attributes.mount"}) {
201	pjm2	1.15	$disk_info .= "<p$i";
202			$disk_info .= " name=\"" . $packet{"packet.disk.p$i.attributes.name"} . "\"";
203			$disk_info .= " kbytes=\"" . $packet{"packet.disk.p$i.attributes.kbytes"} . "\"";
204			$disk_info .= " used=\"" . $packet{"packet.disk.p$i.attributes.used"} . "\"";
205			$disk_info .= " avail=\"" . $packet{"packet.disk.p$i.attributes.avail"} . "\"";
206			$disk_info .= " mount=\"" . $packet{"packet.disk.p$i.attributes.mount"} . "\"";
207			$disk_info .= "></p$i>";
208	pjm2	1.1	++$i;
209			}
210			$disk_info .= "</disk>";
211	pjm2	1.13
212	tdb	1.19	my($ip) = inet_ntoa(scalar(gethostbyname(hostname())) \|\| 'localhost');
213	pjm2	1.1
214			# Build the XML packet this way, as we can clearly
215			# see the structure and contents... I like this ;-)
216	pjm2	1.12	# [Note that the server rejects UDP packets that are
217			# larger than 8196 bytes]
218	pjm2	1.1	my($xml) = <<EOF;
219
220	tdb	1.19	<packet seq_no="$seq_no" machine_name="$fqdn" date="$date" type="data" ip="$ip">
221	pjm2	1.1	<load>
222			<load1>$packet{"packet.load.load1"}</load1>
223			<load5>$packet{"packet.load.load5"}</load5>
224			<load15>$packet{"packet.load.load15"}</load15>
225			</load>
226			<os>
227			<name>$packet{"packet.os.name"}</name>
228			<release>$packet{"packet.os.release"}</release>
229			<platform>$packet{"packet.os.platform"}</platform>
230			<sysname>$packet{"packet.os.sysname"}</sysname>
231			<version>$packet{"packet.os.version"}</version>
232	tdb	1.10	<uptime>$packet{"packet.os.uptime"}</uptime>
233	pjm2	1.1	</os>
234			<users>
235			<count>$packet{"packet.users.count"}</count>
236			<list>$packet{"packet.users.list"}</list>
237			</users>
238			<processes>
239			<total>$packet{"packet.processes.total"}</total>
240			<sleeping>$packet{"packet.processes.sleeping"}</sleeping>
241			<zombie>$packet{"packet.processes.zombie"}</zombie>
242			<stopped>$packet{"packet.processes.stopped"}</stopped>
243			<cpu>$packet{"packet.processes.cpu"}</cpu>
244			</processes>
245			<cpu>
246			<idle>$packet{"packet.cpu.idle"}</idle>
247			<user>$packet{"packet.cpu.user"}</user>
248			<kernel>$packet{"packet.cpu.kernel"}</kernel>
249			<iowait>$packet{"packet.cpu.iowait"}</iowait>
250			<swap>$packet{"packet.cpu.swap"}</swap>
251			</cpu>
252			<memory>
253	pjm2	1.13	<total>$packet{"packet.memory.total"}</total>
254	pjm2	1.1	<free>$packet{"packet.memory.free"}</free>
255			</memory>
256			<swap>
257	pjm2	1.13	<total>$packet{"packet.swap.total"}</total>
258			<free>$packet{"packet.swap.free"}</free>
259	pjm2	1.1	</swap>
260			$disk_info
261			</packet>
262
263			EOF
264
265	pjm2	1.12	# Make the packet smaller by stripping out newlines and leading spaces.
266	pjm2	1.1	$xml =~ s/\n\s*//g;
267	tdb	1.19
268	pjm2	1.1	my($sock) = new IO::Socket::INET (
269			PeerPort => $udp_port,
270			PeerAddr => $filter_addr,
271			Proto => 'udp'
272	pjm2	1.21	) or die "Could not send UDP: $!\n";
273	pjm2	1.1
274			print $sock $xml or die "Could not send UDP packet: $!\n";
275			close($sock);
276			$seq_no++;
277			print "-";
278	pjm2	1.12
279			return;
280	pjm2	1.1	}
281
282	pjm2	1.12
283
284
285			#-----------------------------------------------------------------------
286			# send_tcp_heartbeat
287			# Establishes a TCP connection to an i-scream filter.
288			# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
289			#-----------------------------------------------------------------------
290	pjm2	1.1	sub send_tcp_heartbeat() {
291
292			my($sock) = new IO::Socket::INET(
293			PeerAddr => $filter_addr,
294			PeerPort => $tcp_port,
295			Proto => 'tcp'
296	pjm2	1.21	) or return;
297	pjm2	1.11	if (!defined $sock) {
298			print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
299			return;
300			}
301	pjm2	1.1
302			# Now run through the configuration process.
303			my($response);
304
305			print $sock "HEARTBEAT\n";
306			$response = <$sock>;
307	pjm2	1.23	return if (!defined $response);
308			chop $response;
309	pjm2	1.1	if (!$response eq "OK") {
310			close($sock);
311			print "Server gave wrong response to HEARTBEAT: $response\n";
312			return;
313			}
314
315			print $sock "CONFIG\n";
316			$response = <$sock>;
317	pjm2	1.23	return if (!defined $response);
318			chop $response;
319	pjm2	1.1	if (!$response eq "OK") {
320			close($sock);
321			print "Server gave wrong response to CONFIG: $response\n";
322			return;
323			}
324
325			print $sock "$file_list\n";
326			$response = <$sock>;
327	pjm2	1.23	return if (!defined $response);
328			chop $response;
329	pjm2	1.1	if (!$response eq "OK") {
330			close($sock);
331			print "Server gave wrong response to file list: $response\n";
332			return;
333			}
334
335			print $sock "$last_modified\n";
336			$response = <$sock>;
337	pjm2	1.23	return if (!defined $response);
338			chop $response;
339	pjm2	1.1	if ($response eq "ERROR") {
340			close($sock);
341			&tcp_configure();
342			return;
343			}
344			if (!$response eq "OK") {
345			close($sock);
346			print "Server gave wrong response to HEARTBEAT: $response\n";
347			return;
348			}
349
350			print $sock "ENDHEARTBEAT\n";
351	pjm2	1.23	$response = <$sock>;
352			return if (!defined $response);
353	pjm2	1.1	chop $response;
354			if (!$response eq "OK") {
355			close($sock);
356			print "Server gave wrong response to ENDHEARTBEAT: $response\n";
357			return;
358			}
359
360			close($sock);
361			print "^";
362	pjm2	1.12
363			return;
364	pjm2	1.1	}