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: tdb1 $
# $Id: ihost.pl,v 1.25 2001/03/12 23:20:43 tdb1 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
            );

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;

# 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);


#-----------------------------------------------------------------------
# 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>;
    unless (defined($response)) {
        print "Failed: Could not get a filter address from the filter manager.\n";
        exit(1);
    }
    chop $response;
    $response =~ /(.*);(.*);(.*)/;
    ($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";
        exit(1);
    }
    
    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;
}

#-----------------------------------------------------------------------
# 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:	1.26
Committed:	Mon Mar 12 23:51:15 2001 UTC (23 years, 7 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.25:	+3 -3 lines
Log Message:	Changed the path of the PID file... it didn't work so well when the ihost directory is on a shared file store :)
#	Content
1	#!/usr/bin/perl -w
2
3	# -----------------------------------------------------------
4	# Perl i-scream Host.
5	# http://www.i-scream.org.uk
6	#
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	# $Author: tdb1 $
13	# $Id: ihost.pl,v 1.25 2001/03/12 23:20:43 tdb1 Exp $
14	#------------------------------------------------------------
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	$fqdn
36	$pidfile
37	);
38
39	if (@ARGV != 2) {
40	die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n";
41	}
42
43	$filter_manager_addr = $ARGV[0];
44	$filter_manager_port = $ARGV[1];
45
46	$seq_no = 1;
47
48	# write our PID to a file
49	$pidfile = "/var/tmp/ihost.pid";
50	&write_pid();
51
52	&tcp_configure();
53	&send_udp_packet();
54
55	$last_udp_time = time;
56	$last_tcp_time = time;
57	while (1) {
58	my($time) = time;
59	if ($time >= $last_udp_time + $udp_update_time) {
60	&send_udp_packet();
61	$last_udp_time = $time;
62	}
63	if ($time >= $last_tcp_time + $tcp_update_time) {
64	&send_tcp_heartbeat();
65	$last_tcp_time = $time;
66	}
67	my($next_udp) = $udp_update_time - $time + $last_udp_time;
68	my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
69	my($delay);
70	if ($next_udp < $next_tcp) {
71	$delay = $next_udp
72	}
73	else {
74	$delay = $next_tcp;
75	}
76	`sleep $delay`;
77	}
78
79	# we'll probably never get here...
80	`rm -f $pidfile`;
81	exit(0);
82
83
84	#-----------------------------------------------------------------------
85	# tcp_configure
86	# Establishes a TCP connection to the specified i-scream filter manager.
87	# The host then requests details from the server, such as the intervals
88	# at which to send UDP packets.
89	#-----------------------------------------------------------------------
90	sub tcp_configure() {
91
92	my($sock) = new IO::Socket::INET(
93	PeerAddr => $filter_manager_addr,
94	PeerPort => $filter_manager_port,
95	Proto => 'tcp'
96	) or die "Cannot connect!";
97	if (!defined $sock) {
98	print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
99	print "Please check that there is an i-scream server at this address.\n";
100	print "Program ended.\n";
101	exit(1);
102	}
103
104	# Now run through the configuration process...
105	my($response);
106
107	print $sock "STARTCONFIG\n";
108	$response = <$sock>;
109	if (!chop $response eq "OK") {
110	print "The i-scream server rejected the STARTCONFIG command. Terminated.";
111	exit(1);
112	}
113
114	print "Config started okay.\n";
115
116	print $sock "LASTMODIFIED\n";
117	$response = <$sock>;
118	chop $response;
119	$last_modified = $response;
120
121	print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
122
123	print $sock "FILELIST\n";
124	$response = <$sock>;
125	chop $response;
126	$file_list = $response;
127
128	print "File list obtained: $file_list\n";
129
130	print $sock "FQDN\n";
131	$response = <$sock>;
132	chop $response;
133	$fqdn = $response;
134
135	print "FQDN returned: $fqdn\n";
136
137	print $sock "UDPUpdateTime\n";
138	$response = <$sock>;
139	chop $response;
140	$udp_update_time = $response;
141
142	print $sock "TCPUpdateTime\n";
143	$response = <$sock>;
144	chop $response;
145	$tcp_update_time = $response;
146
147	print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
148
149	print $sock "ENDCONFIG\n";
150	$response = <$sock>;
151	chomp $response;
152	if (!$response eq "OK") {
153	print "ENDCONFIG command to server failed. Terminated.\n";
154	exit(1);
155	}
156
157	print "Config ended.\n";
158
159	print $sock "FILTER\n";
160	$response = <$sock>;
161	unless (defined($response)) {
162	print "Failed: Could not get a filter address from the filter manager.\n";
163	exit(1);
164	}
165	chop $response;
166	$response =~ /(.);(.);(.*)/;
167	($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
168	unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) {
169	print "Failed: Filter address response from server did not make sense: $response\n";
170	exit(1);
171	}
172
173	print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
174
175	print $sock "END\n";
176	$response = <$sock>;
177	chop $response;
178	if ($response eq "OK") {
179	print "Host successfully configured via TCP.\n"
180	}
181	else {
182	print "The server failed the host configuration on the END command.";
183	exit(1);
184	}
185
186	close($sock);
187
188	print "Configuration finished sucessfully!\n";
189
190	return;
191	}
192
193
194
195
196	#-----------------------------------------------------------------------
197	# send_udp_packet
198	# Sends a UDP packet to an i-scream filter.
199	# The packet contains XML markup describing some of the machine's state.
200	# Receipt of UDP packets is not guaranteed.
201	#-----------------------------------------------------------------------
202	sub send_udp_packet() {
203
204	my(@statgrab) = `./statgrab.pl`;
205	my(%packet);
206	for (my($i) = 0; $i <= $#statgrab; $i++) {
207	$statgrab[$i] =~ /^([^\s]) (.)$/;
208	$packet{$1} = $2;
209	}
210
211	my($date) = time;
212
213	my($disk_info) = "<disk>";
214	my($i) = 0;
215	while (defined $packet{"packet.disk.p$i.attributes.mount"}) {
216	$disk_info .= "<p$i";
217	$disk_info .= " name=\"" . $packet{"packet.disk.p$i.attributes.name"} . "\"";
218	$disk_info .= " kbytes=\"" . $packet{"packet.disk.p$i.attributes.kbytes"} . "\"";
219	$disk_info .= " used=\"" . $packet{"packet.disk.p$i.attributes.used"} . "\"";
220	$disk_info .= " avail=\"" . $packet{"packet.disk.p$i.attributes.avail"} . "\"";
221	$disk_info .= " mount=\"" . $packet{"packet.disk.p$i.attributes.mount"} . "\"";
222	$disk_info .= "></p$i>";
223	++$i;
224	}
225	$disk_info .= "</disk>";
226
227	my($ip) = inet_ntoa(scalar(gethostbyname(hostname())) \|\| 'localhost');
228
229	# Build the XML packet this way, as we can clearly
230	# see the structure and contents... I like this ;-)
231	# [Note that the server rejects UDP packets that are
232	# larger than 8196 bytes]
233	my($xml) = <<EOF;
234
235	<packet seq_no="$seq_no" machine_name="$fqdn" date="$date" type="data" ip="$ip">
236	<load>
237	<load1>$packet{"packet.load.load1"}</load1>
238	<load5>$packet{"packet.load.load5"}</load5>
239	<load15>$packet{"packet.load.load15"}</load15>
240	</load>
241	<os>
242	<name>$packet{"packet.os.name"}</name>
243	<release>$packet{"packet.os.release"}</release>
244	<platform>$packet{"packet.os.platform"}</platform>
245	<sysname>$packet{"packet.os.sysname"}</sysname>
246	<version>$packet{"packet.os.version"}</version>
247	<uptime>$packet{"packet.os.uptime"}</uptime>
248	</os>
249	<users>
250	<count>$packet{"packet.users.count"}</count>
251	<list>$packet{"packet.users.list"}</list>
252	</users>
253	<processes>
254	<total>$packet{"packet.processes.total"}</total>
255	<sleeping>$packet{"packet.processes.sleeping"}</sleeping>
256	<zombie>$packet{"packet.processes.zombie"}</zombie>
257	<stopped>$packet{"packet.processes.stopped"}</stopped>
258	<cpu>$packet{"packet.processes.cpu"}</cpu>
259	</processes>
260	<cpu>
261	<idle>$packet{"packet.cpu.idle"}</idle>
262	<user>$packet{"packet.cpu.user"}</user>
263	<kernel>$packet{"packet.cpu.kernel"}</kernel>
264	<iowait>$packet{"packet.cpu.iowait"}</iowait>
265	<swap>$packet{"packet.cpu.swap"}</swap>
266	</cpu>
267	<memory>
268	<total>$packet{"packet.memory.total"}</total>
269	<free>$packet{"packet.memory.free"}</free>
270	</memory>
271	<swap>
272	<total>$packet{"packet.swap.total"}</total>
273	<free>$packet{"packet.swap.free"}</free>
274	</swap>
275	$disk_info
276	</packet>
277
278	EOF
279
280	# Make the packet smaller by stripping out newlines and leading spaces.
281	$xml =~ s/\n\s*//g;
282
283	my($sock) = new IO::Socket::INET (
284	PeerPort => $udp_port,
285	PeerAddr => $filter_addr,
286	Proto => 'udp'
287	) or die "Could not send UDP: $!\n";
288
289	print $sock $xml or die "Could not send UDP packet: $!\n";
290	close($sock);
291	$seq_no++;
292	print "-";
293
294	return;
295	}
296
297
298
299
300	#-----------------------------------------------------------------------
301	# send_tcp_heartbeat
302	# Establishes a TCP connection to an i-scream filter.
303	# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
304	#-----------------------------------------------------------------------
305	sub send_tcp_heartbeat() {
306
307	my($sock) = new IO::Socket::INET(
308	PeerAddr => $filter_addr,
309	PeerPort => $tcp_port,
310	Proto => 'tcp'
311	) or return;
312	if (!defined $sock) {
313	print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
314	return;
315	}
316
317	# Now run through the configuration process.
318	my($response);
319
320	print $sock "HEARTBEAT\n";
321	$response = <$sock>;
322	return if (!defined $response);
323	chop $response;
324	if (!$response eq "OK") {
325	close($sock);
326	print "Server gave wrong response to HEARTBEAT: $response\n";
327	return;
328	}
329
330	print $sock "CONFIG\n";
331	$response = <$sock>;
332	return if (!defined $response);
333	chop $response;
334	if (!$response eq "OK") {
335	close($sock);
336	print "Server gave wrong response to CONFIG: $response\n";
337	return;
338	}
339
340	print $sock "$file_list\n";
341	$response = <$sock>;
342	return if (!defined $response);
343	chop $response;
344	if (!$response eq "OK") {
345	close($sock);
346	print "Server gave wrong response to file list: $response\n";
347	return;
348	}
349
350	print $sock "$last_modified\n";
351	$response = <$sock>;
352	return if (!defined $response);
353	chop $response;
354	if ($response eq "ERROR") {
355	close($sock);
356	&tcp_configure();
357	return;
358	}
359	if (!$response eq "OK") {
360	close($sock);
361	print "Server gave wrong response to HEARTBEAT: $response\n";
362	return;
363	}
364
365	print $sock "ENDHEARTBEAT\n";
366	$response = <$sock>;
367	return if (!defined $response);
368	chop $response;
369	if (!$response eq "OK") {
370	close($sock);
371	print "Server gave wrong response to ENDHEARTBEAT: $response\n";
372	return;
373	}
374
375	close($sock);
376	print "^";
377
378	return;
379	}
380
381	#-----------------------------------------------------------------------
382	# write_pid
383	# Writes the PID (process ID) of this instance to $pidfile.
384	# This is then used by a seperate script to check (and restart) ihost.
385	#-----------------------------------------------------------------------
386	sub write_pid() {
387	open PID, ">$pidfile";
388	print PID $$;
389	close PID;
390
391	return;
392	}