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 1.11 2001/02/01 09:10:52 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
            );

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'
                                    );
    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 "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>";
        $disk_info .= qq/<name>$packet{"packet.disk.p$i.attributes.name"}<\/name>/;
        $disk_info .= qq/<kbytes>$packet{"packet.disk.p$i.attributes.kbytes"}<\/kbytes>/;
        $disk_info .= qq/<used>$packet{"packet.disk.p$i.attributes.used"}<\/used>/;
        $disk_info .= qq/<avail>$packet{"packet.disk.p$i.attributes.avail"}<\/avail>/;
        $disk_info .= qq/<mount>$packet{"packet.disk.p$i.attributes.mount"}<\/mount>/;
        $disk_info .= "</p$i>";
        ++$i;
    }
    $disk_info .= "</disk>";

    my($hostname) = hostname();
    $hostname =~ s/\..*$//g;
    `cat /etc/resolv.conf` =~ /domain\s+([^\s]+)/;
    my($domainname) = $1;
    my($machine_name) = "$hostname.$domainname";
    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="$seq_no" machine_name="$machine_name" 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.real"}</total>
        <free>$packet{"packet.memory.free"}</free>
    </memory>
    <swap>
        <total>$packet{"packet.memory.swap_total"}</total>
        <free>$packet{"packet.memory.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 "Socket: $!\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'
                                    );
    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>;
    chop $response;
    if (!$response eq "OK") {
        close($sock);
        print "Server gave wrong response to HEARTBEAT: $response\n";
        return;
    }
    
    print $sock "CONFIG\n";
    $response = <$sock>;
    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>;
    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>;
    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>;
    chop $response;
    if (!$response eq "OK") {
        close($sock);
        print "Server gave wrong response to ENDHEARTBEAT: $response\n";
        return;
    }
    
    close($sock);
    print "^";
    
    return;
}
Revision:	1.12
Committed:	Thu Feb 1 09:24:54 2001 UTC (23 years, 7 months ago) by pjm2
Content type:	text/plain
Branch:	MAIN
Changes since 1.11:	+37 -3 lines
Log Message:	Tidied up the code a little, added explicit returns in the subroutines, a couple more comments where it was deemed necessary.
#	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	1.12	# $Author: pjm2 $
13			# $Id: ihost.pl,v 1.11 2001/02/01 09:10:52 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			);
36
37			if (@ARGV != 2) {
38			die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n";
39			}
40
41			$filter_manager_addr = $ARGV[0];
42			$filter_manager_port = $ARGV[1];
43
44			$seq_no = 1;
45
46			&tcp_configure();
47			&send_udp_packet();
48
49			$last_udp_time = time;
50			$last_tcp_time = time;
51			while (1) {
52	pjm2	1.9	my($time) = time;
53			if ($time >= $last_udp_time + $udp_update_time) {
54	pjm2	1.1	&send_udp_packet();
55	pjm2	1.9	$last_udp_time = $time;
56	pjm2	1.1	}
57	pjm2	1.9	if ($time >= $last_tcp_time + $tcp_update_time) {
58	pjm2	1.1	&send_tcp_heartbeat();
59	pjm2	1.9	$last_tcp_time = $time;
60	pjm2	1.1	}
61	pjm2	1.9	my($next_udp) = $udp_update_time - $time + $last_udp_time;
62			my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
63			my($delay);
64			if ($next_udp < $next_tcp) {
65			$delay = $next_udp
66			}
67			else {
68			$delay = $next_tcp;
69			}
70			`sleep $delay`;
71	pjm2	1.1	}
72
73			exit(0);
74
75	pjm2	1.12
76			#-----------------------------------------------------------------------
77			# tcp_configure
78			# Establishes a TCP connection to the specified i-scream filter manager.
79			# The host then requests details from the server, such as the intervals
80			# at which to send UDP packets.
81			#-----------------------------------------------------------------------
82	pjm2	1.1	sub tcp_configure() {
83
84			my($sock) = new IO::Socket::INET(
85			PeerAddr => $filter_manager_addr,
86			PeerPort => $filter_manager_port,
87			Proto => 'tcp'
88	pjm2	1.11	);
89			if (!defined $sock) {
90			print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
91			print "Please check that there is an i-scream server at this address.\n";
92			print "Program ended.\n";
93			exit(1);
94			}
95	pjm2	1.1
96	pjm2	1.12	# Now run through the configuration process...
97	pjm2	1.1	my($response);
98
99			print $sock "STARTCONFIG\n";
100			$response = <$sock>;
101			if (!chop $response eq "OK") {
102			print "The i-scream server rejected the STARTCONFIG command. Terminated.";
103			exit(1);
104			}
105
106			print "Config started okay.\n";
107
108			print $sock "LASTMODIFIED\n";
109			$response = <$sock>;
110			chop $response;
111			$last_modified = $response;
112
113	pjm2	1.7	print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
114	pjm2	1.1
115			print $sock "FILELIST\n";
116			$response = <$sock>;
117			chop $response;
118			$file_list = $response;
119
120			print "File list obtained: $file_list\n";
121
122			print $sock "UDPUpdateTime\n";
123			$response = <$sock>;
124			chop $response;
125			$udp_update_time = $response;
126
127			print $sock "TCPUpdateTime\n";
128			$response = <$sock>;
129			chop $response;
130			$tcp_update_time = $response;
131
132	pjm2	1.7	print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
133	pjm2	1.1
134			print $sock "ENDCONFIG\n";
135			$response = <$sock>;
136			chomp $response;
137			if (!$response eq "OK") {
138			print "ENDCONFIG command to server failed. Terminated.\n";
139			exit(1);
140			}
141
142			print "Config ended.\n";
143
144			print $sock "FILTER\n";
145			$response = <$sock>;
146			chop $response;
147			$response =~ /(.);(.);(.*)/;
148			($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
149
150			print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
151
152			print $sock "END\n";
153			$response = <$sock>;
154			chop $response;
155			if ($response eq "OK") {
156			print "Host successfully configured via TCP.\n"
157			}
158			else {
159			print "The server failed the host configuration on the END command.";
160			exit(1);
161			}
162
163			close($sock);
164
165			print "Configuration finished sucessfully!\n";
166	pjm2	1.12
167			return;
168	pjm2	1.1	}
169
170	pjm2	1.12
171
172
173			#-----------------------------------------------------------------------
174			# send_udp_packet
175			# Sends a UDP packet to an i-scream filter.
176			# The packet contains XML markup describing some of the machine's state.
177			# Receipt of UDP packets is not guaranteed.
178			#-----------------------------------------------------------------------
179	pjm2	1.1	sub send_udp_packet() {
180
181			my(@statgrab) = `./statgrab.pl`;
182			my(%packet);
183			for (my($i) = 0; $i < $#statgrab; $i++) {
184			$statgrab[$i] =~ /^([^\s]) (.)$/;
185			$packet{$1} = $2;
186			}
187
188			my($date) = time;
189
190			my($disk_info) = "<disk>";
191			my($i) = 0;
192			while (defined $packet{"packet.disk.p$i.attributes.mount"}) {
193			$disk_info .= "<p$i>";
194			$disk_info .= qq/<name>$packet{"packet.disk.p$i.attributes.name"}<\/name>/;
195			$disk_info .= qq/<kbytes>$packet{"packet.disk.p$i.attributes.kbytes"}<\/kbytes>/;
196			$disk_info .= qq/<used>$packet{"packet.disk.p$i.attributes.used"}<\/used>/;
197			$disk_info .= qq/<avail>$packet{"packet.disk.p$i.attributes.avail"}<\/avail>/;
198			$disk_info .= qq/<mount>$packet{"packet.disk.p$i.attributes.mount"}<\/mount>/;
199			$disk_info .= "</p$i>";
200			++$i;
201			}
202			$disk_info .= "</disk>";
203
204			my($hostname) = hostname();
205	pjm2	1.4	$hostname =~ s/\..*$//g;
206	pjm2	1.8	`cat /etc/resolv.conf` =~ /domain\s+([^\s]+)/;
207			my($domainname) = $1;
208	pjm2	1.1	my($machine_name) = "$hostname.$domainname";
209			my($ip) = inet_ntoa(scalar(gethostbyname($hostname)) \|\| 'localhost');
210
211			# Build the XML packet this way, as we can clearly
212			# see the structure and contents... I like this ;-)
213	pjm2	1.12	# [Note that the server rejects UDP packets that are
214			# larger than 8196 bytes]
215	pjm2	1.1	my($xml) = <<EOF;
216
217			<packet seq_no="$seq_no" machine_name="$machine_name" date="$date" type="data" ip="$ip">
218			<load>
219			<load1>$packet{"packet.load.load1"}</load1>
220			<load5>$packet{"packet.load.load5"}</load5>
221			<load15>$packet{"packet.load.load15"}</load15>
222			</load>
223			<os>
224			<name>$packet{"packet.os.name"}</name>
225			<release>$packet{"packet.os.release"}</release>
226			<platform>$packet{"packet.os.platform"}</platform>
227			<sysname>$packet{"packet.os.sysname"}</sysname>
228			<version>$packet{"packet.os.version"}</version>
229	tdb	1.10	<uptime>$packet{"packet.os.uptime"}</uptime>
230	pjm2	1.1	</os>
231			<users>
232			<count>$packet{"packet.users.count"}</count>
233			<list>$packet{"packet.users.list"}</list>
234			</users>
235			<processes>
236			<total>$packet{"packet.processes.total"}</total>
237			<sleeping>$packet{"packet.processes.sleeping"}</sleeping>
238			<zombie>$packet{"packet.processes.zombie"}</zombie>
239			<stopped>$packet{"packet.processes.stopped"}</stopped>
240			<cpu>$packet{"packet.processes.cpu"}</cpu>
241			</processes>
242			<cpu>
243			<idle>$packet{"packet.cpu.idle"}</idle>
244			<user>$packet{"packet.cpu.user"}</user>
245			<kernel>$packet{"packet.cpu.kernel"}</kernel>
246			<iowait>$packet{"packet.cpu.iowait"}</iowait>
247			<swap>$packet{"packet.cpu.swap"}</swap>
248			</cpu>
249			<memory>
250			<total>$packet{"packet.memory.real"}</total>
251			<free>$packet{"packet.memory.free"}</free>
252			</memory>
253			<swap>
254			<total>$packet{"packet.memory.swap_total"}</total>
255			<free>$packet{"packet.memory.swap_free"}</free>
256			</swap>
257			$disk_info
258			</packet>
259
260			EOF
261
262	pjm2	1.12	# Make the packet smaller by stripping out newlines and leading spaces.
263	pjm2	1.1	$xml =~ s/\n\s*//g;
264
265			my($sock) = new IO::Socket::INET (
266			PeerPort => $udp_port,
267			PeerAddr => $filter_addr,
268			Proto => 'udp'
269			) or die "Socket: $!\n";
270
271			print $sock $xml or die "Could not send UDP packet: $!\n";
272			close($sock);
273			$seq_no++;
274			print "-";
275	pjm2	1.12
276			return;
277	pjm2	1.1	}
278
279	pjm2	1.12
280
281
282			#-----------------------------------------------------------------------
283			# send_tcp_heartbeat
284			# Establishes a TCP connection to an i-scream filter.
285			# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
286			#-----------------------------------------------------------------------
287	pjm2	1.1	sub send_tcp_heartbeat() {
288
289			my($sock) = new IO::Socket::INET(
290			PeerAddr => $filter_addr,
291			PeerPort => $tcp_port,
292			Proto => 'tcp'
293	pjm2	1.11	);
294			if (!defined $sock) {
295			print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
296			return;
297			}
298	pjm2	1.1
299			# Now run through the configuration process.
300			my($response);
301
302			print $sock "HEARTBEAT\n";
303			$response = <$sock>;
304			chop $response;
305			if (!$response eq "OK") {
306			close($sock);
307			print "Server gave wrong response to HEARTBEAT: $response\n";
308			return;
309			}
310
311			print $sock "CONFIG\n";
312			$response = <$sock>;
313			chop $response;
314			if (!$response eq "OK") {
315			close($sock);
316			print "Server gave wrong response to CONFIG: $response\n";
317			return;
318			}
319
320			print $sock "$file_list\n";
321			$response = <$sock>;
322			chop $response;
323			if (!$response eq "OK") {
324			close($sock);
325			print "Server gave wrong response to file list: $response\n";
326			return;
327			}
328
329			print $sock "$last_modified\n";
330			$response = <$sock>;
331			chop $response;
332			if ($response eq "ERROR") {
333			close($sock);
334			&tcp_configure();
335			return;
336			}
337			if (!$response eq "OK") {
338			close($sock);
339			print "Server gave wrong response to HEARTBEAT: $response\n";
340			return;
341			}
342
343			print $sock "ENDHEARTBEAT\n";
344			$response = <$sock>;
345			chop $response;
346			if (!$response eq "OK") {
347			close($sock);
348			print "Server gave wrong response to ENDHEARTBEAT: $response\n";
349			return;
350			}
351
352			close($sock);
353			print "^";
354	pjm2	1.12
355			return;
356	pjm2	1.1	}