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root/i-scream/projects/cms/source/host/ihost-perl/ihost.pl

Comparing projects/cms/source/host/ihost-perl/ihost.pl (file contents):
Revision 1.19 by tdb, Wed Feb 28 10:52:16 2001 UTC vs.
Revision 1.35 by tdb, Wed Nov 14 14:17:12 2001 UTC

#	Line 33 | Line 33 | use vars qw (
33		$filter_addr
34		$file_list
35		$fqdn
36	+	$pidfile
37	+	$retry_wait
38		);
39
40		if (@ARGV != 2) {
#	Line 43 | Line 45 | $filter_manager_addr = $ARGV[0];
45		$filter_manager_port = $ARGV[1];
46
47		$seq_no = 1;
48	+	$retry_wait = 60;
49
50	+	# write our PID to a file
51	+	$pidfile = "/var/tmp/ihost.pid";
52	+	&write_pid();
53	+
54		&tcp_configure();
55		&send_udp_packet();
56
#	Line 68 | Line 75 | while (1) {
75		else {
76		$delay = $next_tcp;
77		}
78	<	`sleep $delay`;
78	>	sleep $delay;
79		}
80
81	+	# we'll probably never get here...
82	+	`rm -f $pidfile`;
83		exit(0);
84
85
86		#-----------------------------------------------------------------------
87	+	# 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	+	sleep $retry_wait;
94	+	}
95	+
96	+
97	+	#-----------------------------------------------------------------------
98		# tcp_configure
99		# Establishes a TCP connection to the specified i-scream filter manager.
100		# The host then requests details from the server, such as the intervals
#	Line 82 | Line 102 | exit(0);
102		#-----------------------------------------------------------------------
103		sub tcp_configure() {
104
105	<	my($sock) = new IO::Socket::INET(
106	<	PeerAddr => $filter_manager_addr,
107	<	PeerPort => $filter_manager_port,
108	<	Proto => 'tcp'
109	<	);
110	<	if (!defined $sock) {
111	<	print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n";
112	<	print "Please check that there is an i-scream server at this address.\n";
113	<	print "Program ended.\n";
114	<	exit(1);
115	<	}
105	>	while (1) {
106	>	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($response);
118	>	# Now run through the configuration process...
119	>	my($response);
120
121	<	print $sock "STARTCONFIG\n";
122	<	$response = <$sock>;
123	<	if (!chop $response eq "OK") {
124	<	print "The i-scream server rejected the STARTCONFIG command.  Terminated.";
125	<	exit(1);
126	<	}
121	>	print $sock "STARTCONFIG\n";
122	>	$response = <$sock>;
123	>	if ($response && !($response eq "OK\n")) {
124	>	print "The i-scream server rejected the STARTCONFIG command.\n";
125	>	close($sock);
126	>	wait_then_retry();
127	>	next;
128	>	}
129
130	<	print "Config started okay.\n";
130	>	print "Config started okay.\n";
131
132	<	print $sock "LASTMODIFIED\n";
133	<	$response = <$sock>;
134	<	chop $response;
135	<	$last_modified = $response;
132	>	print $sock "LASTMODIFIED\n";
133	>	$response = <$sock>;
134	>	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	>	chop $response;
141	>	$last_modified = $response;
142
143	<	print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
143	>	print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n";
144
145	<	print $sock "FILELIST\n";
146	<	$response = <$sock>;
147	<	chop $response;
148	<	$file_list = $response;
145	>	print $sock "FILELIST\n";
146	>	$response = <$sock>;
147	>	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	>	chop $response;
154	>	$file_list = $response;
155
156	<	print "File list obtained: $file_list\n";
156	>	print "File list obtained: $file_list\n";
157
158	<	print $sock "FQDN\n";
159	<	$response = <$sock>;
160	<	chop $response;
161	<	$fqdn = $response;
158	>	print $sock "FQDN\n";
159	>	$response = <$sock>;
160	>	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	>	chop $response;
167	>	$fqdn = $response;
168
169	<	print "FQDN returned: $fqdn\n";
169	>	print "FQDN returned: $fqdn\n";
170
171	<	print $sock "UDPUpdateTime\n";
172	<	$response = <$sock>;
173	<	chop $response;
174	<	$udp_update_time = $response;
171	>	print $sock "UDPUpdateTime\n";
172	>	$response = <$sock>;
173	>	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	>	chop $response;
180	>	$udp_update_time = $response;
181
182	<	print $sock "TCPUpdateTime\n";
183	<	$response = <$sock>;
184	<	chop $response;
185	<	$tcp_update_time = $response;
182	>	print $sock "TCPUpdateTime\n";
183	>	$response = <$sock>;
184	>	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	>	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";
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	<	chomp $response;
198	<	if (!$response eq "OK") {
199	<	print "ENDCONFIG command to server failed.  Terminated.\n";
200	<	exit(1);
201	<	}
195	>	print $sock "ENDCONFIG\n";
196	>	$response = <$sock>;
197	>	if ($response && !($response eq "OK\n")) {
198	>	print "ENDCONFIG command to server failed.  Terminated.\n";
199	>	close($sock);
200	>	wait_then_retry();
201	>	next;
202	>	}
203
204	<	print "Config ended.\n";
204	>	print "Config ended.\n";
205
206	<	print $sock "FILTER\n";
207	<	$response = <$sock>;
208	<	chop $response;
209	<	$response =~ /(.*);(.*);(.*)/;
210	<	($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3);
206	>	print $sock "FILTER\n";
207	>	$response = <$sock>;
208	>	if (!$response) {
209	>	print "Failed: Could not get a filter address from the filter manager.\n";
210	>	close($sock);
211	>	wait_then_retry();
212	>	next;
213	>	}
214	>	chop $response;
215	>	$response =~ /^(.*);(.*);(.*)/;
216	>	if ($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, $tcp_port)\n";
230	>	print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n";
231
232	<	print $sock "END\n";
233	<	$response = <$sock>;
234	<	chop $response;
235	<	if ($response eq "OK") {
236	<	print "Host successfully configured via TCP.\n"
237	<	}
238	<	else {
239	<	print "The server failed the host configuration on the END command.";
240	<	exit(1);
241	<	}
232	>	print $sock "END\n";
233	>	$response = <$sock>;
234	>	if ($response && ($response eq "OK\n")) {
235	>	print "Host successfully configured via TCP.\n"
236	>	}
237	>	else {
238	>	print "The server failed the host configuration on the END command.\n";
239	>	close($sock);
240	>	wait_then_retry();
241	>	next;
242	>	}
243
244	<	close($sock);
244	>	close($sock);
245
246	<	print "Configuration finished sucessfully!\n";
247	<
246	>	print "Configuration finished sucessfully!\n";
247	>	last;
248	>	}
249		return;
250		}
251
#	Line 209 | Line 283 | sub send_udp_packet() {
283		}
284		$disk_info .= "</disk>";
285
286	<	my($ip) = inet_ntoa(scalar(gethostbyname(hostname())) || 'localhost');
286	>	my($ip);
287	>	$ip = inet_ntoa(scalar(gethostbyname(hostname())) || 'localhost') or $ip = 'localhost';
288
289		# Build the XML packet this way, as we can clearly
290		# see the structure and contents... I like this ;-)
#	Line 265 | Line 340 | EOF
340		# Make the packet smaller by stripping out newlines and leading spaces.
341		$xml =~ s/\n\s*//g;
342
268	–	print $xml;
269	–
343		my($sock) = new IO::Socket::INET (
344		PeerPort => $udp_port,
345		PeerAddr => $filter_addr,
346		Proto => 'udp'
347	<	) or die "Socket: $!\n";
347	>	) or die "Could not send UDP: $!\n";
348
349		print $sock $xml or die "Could not send UDP packet: $!\n";
350		close($sock);
#	Line 288 | Line 361 | print $xml;
361		# send_tcp_heartbeat
362		# Establishes a TCP connection to an i-scream filter.
363		# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
364	+	# If we need to reconfigure, then we complete the heartbeat before
365	+	# doing so.
366		#-----------------------------------------------------------------------
367		sub send_tcp_heartbeat() {
368
369	+	my ($doReconfigure) = 0;
370	+
371		my($sock) = new IO::Socket::INET(
372		PeerAddr => $filter_addr,
373		PeerPort => $tcp_port,
374		Proto => 'tcp'
375	<	);
375	>	) or return;
376		if (!defined $sock) {
377		print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
378	+	&tcp_configure();
379		return;
380		}
381
#	Line 306 | Line 384 | sub send_tcp_heartbeat() {
384
385		print $sock "HEARTBEAT\n";
386		$response = <$sock>;
387	<	chop $response;
310	<	if (!$response eq "OK") {
387	>	if (!$response eq "OK\n") {
388		close($sock);
389		print "Server gave wrong response to HEARTBEAT: $response\n";
390	+	&tcp_configure();
391		return;
392		}
393
394		print $sock "CONFIG\n";
395		$response = <$sock>;
396	<	chop $response;
319	<	if (!$response eq "OK") {
396	>	if (!$response eq "OK\n") {
397		close($sock);
398		print "Server gave wrong response to CONFIG: $response\n";
399	+	&tcp_configure();
400		return;
401		}
402
403		print $sock "$file_list\n";
404		$response = <$sock>;
405	<	chop $response;
328	<	if (!$response eq "OK") {
405	>	if (!$response eq "OK\n") {
406		close($sock);
407		print "Server gave wrong response to file list: $response\n";
408	+	&tcp_configure();
409		return;
410		}
411
412		print $sock "$last_modified\n";
413		$response = <$sock>;
414	<	chop $response;
337	<	if ($response eq "ERROR") {
414	>	if ($response eq "ERROR\n") {
415		close($sock);
416	<	&tcp_configure();
417	<	return;
416	>	print "Server configuration changed.  Reconfiguring with filter manager.\n";
417	>	$doReconfigure = 1;
418		}
419	<	if (!$response eq "OK") {
419	>	if (!$response eq "OK\n") {
420		close($sock);
421		print "Server gave wrong response to HEARTBEAT: $response\n";
422	+	&tcp_configure();
423		return;
424		}
425
426		print $sock "ENDHEARTBEAT\n";
427		$response = <$sock>;
428	<	chop $response;
351	<	if (!$response eq "OK") {
428	>	if (!$response eq "OK\n") {
429		close($sock);
430		print "Server gave wrong response to ENDHEARTBEAT: $response\n";
431	+	&tcp_configure();
432		return;
433		}
434
435		close($sock);
436		print "^";
437	+
438	+	&tcp_configure() if $doReconfigure;
439	+
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
453		return;
454		}

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