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, 9 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.
#	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: pjm2 $
13	# $Id: ihost.pl,v 1.11 2001/02/01 09:10:52 pjm2 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	);
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	$last_tcp_time = time;
51	while (1) {
52	my($time) = time;
53	if ($time >= $last_udp_time + $udp_update_time) {
54	&send_udp_packet();
55	$last_udp_time = $time;
56	}
57	if ($time >= $last_tcp_time + $tcp_update_time) {
58	&send_tcp_heartbeat();
59	$last_tcp_time = $time;
60	}
61	my($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 $delay`;
71	}
72
73	exit(0);
74
75
76	#-----------------------------------------------------------------------
77	# tcp_configure
78	# Establishes a TCP connection to the specified i-scream filter manager.
79	# The host then requests details from the server, such as the intervals
80	# at which to send UDP packets.
81	#-----------------------------------------------------------------------
82	sub tcp_configure() {
83
84	my($sock) = new IO::Socket::INET(
85	PeerAddr => $filter_manager_addr,
86	PeerPort => $filter_manager_port,
87	Proto => 'tcp'
88	);
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
96	# Now run through the configuration process...
97	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	print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
114
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	print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n";
133
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($sock);
164
165	print "Configuration finished sucessfully!\n";
166
167	return;
168	}
169
170
171
172
173	#-----------------------------------------------------------------------
174	# send_udp_packet
175	# Sends a UDP packet to an i-scream filter.
176	# The packet contains XML markup describing some of the machine's state.
177	# Receipt of UDP packets is not guaranteed.
178	#-----------------------------------------------------------------------
179	sub send_udp_packet() {
180
181	my(@statgrab) = `./statgrab.pl`;
182	my(%packet);
183	for (my($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	$hostname =~ s/\..*$//g;
206	`cat /etc/resolv.conf` =~ /domain\s+([^\s]+)/;
207	my($domainname) = $1;
208	my($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	# [Note that the server rejects UDP packets that are
214	# larger than 8196 bytes]
215	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>$packet{"packet.os.version"}</version>
229	<uptime>$packet{"packet.os.uptime"}</uptime>
230	</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	# Make the packet smaller by stripping out newlines and leading spaces.
263	$xml =~ s/\n\s*//g;
264
265	my($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	$seq_no++;
274	print "-";
275
276	return;
277	}
278
279
280
281
282	#-----------------------------------------------------------------------
283	# send_tcp_heartbeat
284	# Establishes a TCP connection to an i-scream filter.
285	# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
286	#-----------------------------------------------------------------------
287	sub send_tcp_heartbeat() {
288
289	my($sock) = new IO::Socket::INET(
290	PeerAddr => $filter_addr,
291	PeerPort => $tcp_port,
292	Proto => 'tcp'
293	);
294	if (!defined $sock) {
295	print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
296	return;
297	}
298
299	# Now run through the configuration process.
300	my($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
355	return;
356	}