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root/i-scream/projects/cms/source/host/ihost-perl/ihost.pl
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Comparing projects/cms/source/host/ihost-perl/ihost.pl (file contents):
Revision 1.2 by pjm2, Fri Jan 26 17:26:11 2001 UTC vs.
Revision 1.32 by pjm2, Fri Mar 16 18:25:59 2001 UTC

# Line 1 | Line 1
1 < #!/usr/local/bin/perl -w
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
# Line 31 | Line 32 | use vars qw (
32               $tcp_port
33               $filter_addr
34               $file_list
35 +             $fqdn
36 +             $pidfile
37 +             $retry_wait
38              );
39  
40   if (@ARGV != 2) {
# Line 41 | Line 45 | $filter_manager_addr = $ARGV[0];
45   $filter_manager_port = $ARGV[1];
46  
47   $seq_no = 1;
48 + $retry_wait = 6;
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  
57   $last_udp_time = time;
58   $last_tcp_time = time;
59   while (1) {
60 <    if (time >= $last_udp_time + $udp_update_time) {
60 >    my($time) = time;
61 >    if ($time >= $last_udp_time + $udp_update_time) {
62          &send_udp_packet();
63 <        $last_udp_time = time;
63 >        $last_udp_time = $time;
64      }
65 <    if (time >= $last_tcp_time + $tcp_update_time) {
65 >    if ($time >= $last_tcp_time + $tcp_update_time) {
66          &send_tcp_heartbeat();
67 <        $last_tcp_time = time;
67 >        $last_tcp_time = $time;
68      }
69 <    `sleep 1`;
69 >    my($next_udp) = $udp_update_time - $time + $last_udp_time;
70 >    my($next_tcp) = $tcp_update_time - $time + $last_tcp_time;
71 >    my($delay);
72 >    if ($next_udp < $next_tcp) {
73 >        $delay = $next_udp
74 >    }
75 >    else {
76 >        $delay = $next_tcp;
77 >    }
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 $retry_wait`;
94 + }
95 +
96 +
97 + #-----------------------------------------------------------------------
98 + # tcp_configure
99 + # Establishes a TCP connection to the specified i-scream filter manager.
100 + # The host then requests details from the server, such as the intervals
101 + # at which to send UDP packets.
102 + #-----------------------------------------------------------------------
103   sub tcp_configure() {
104      
105 <    my($sock) = new IO::Socket::INET(
106 <                                     PeerAddr => $filter_manager_addr,
107 <                                     PeerPort => $filter_manager_port,
108 <                                     Proto => 'tcp'
109 <                                    ) or die "Could not perform configuration via TCP: $!\n";
105 >    while (1) {
106 >        my($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 <    die "Could not connect to the i-scream filter manager: $!\n" unless $sock;
119 <
74 <    # Now run through the configuration process.
75 <    my($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 . "\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 "UDPUpdateTime\n";
159 <    $response = <$sock>;
160 <    chop $response;
161 <    $udp_update_time = $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 $sock "TCPUpdateTime\n";
170 <    $response = <$sock>;
171 <    chop $response;
172 <    $tcp_update_time = $response;
169 >        print "FQDN returned: $fqdn\n";
170 >
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 >        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.\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($sock);
245  
246 <    print "Configuration finished sucessfully!\n";
246 >        print "Configuration finished sucessfully!\n";
247 >        last;
248 >    }
249 >    return;
250   }
251  
252 +
253 +
254 +
255 + #-----------------------------------------------------------------------
256 + # send_udp_packet
257 + # Sends a UDP packet to an i-scream filter.
258 + # The packet contains XML markup describing some of the machine's state.
259 + # Receipt of UDP packets is not guaranteed.
260 + #-----------------------------------------------------------------------
261   sub send_udp_packet() {
262  
263      my(@statgrab) = `./statgrab.pl`;
264      my(%packet);
265 <    for (my($i) = 0; $i < $#statgrab; $i++) {
265 >    for (my($i) = 0; $i <= $#statgrab; $i++) {
266          $statgrab[$i] =~ /^([^\s]*) (.*)$/;
267          $packet{$1} = $2;
268      }
# Line 157 | Line 272 | sub send_udp_packet() {
272      my($disk_info) = "<disk>";
273      my($i) = 0;
274      while (defined $packet{"packet.disk.p$i.attributes.mount"}) {
275 <        $disk_info .= "<p$i>";
276 <        $disk_info .= qq/<name>$packet{"packet.disk.p$i.attributes.name"}<\/name>/;
277 <        $disk_info .= qq/<kbytes>$packet{"packet.disk.p$i.attributes.kbytes"}<\/kbytes>/;
278 <        $disk_info .= qq/<used>$packet{"packet.disk.p$i.attributes.used"}<\/used>/;
279 <        $disk_info .= qq/<avail>$packet{"packet.disk.p$i.attributes.avail"}<\/avail>/;
280 <        $disk_info .= qq/<mount>$packet{"packet.disk.p$i.attributes.mount"}<\/mount>/;
281 <        $disk_info .= "</p$i>";
275 >        $disk_info .= "<p$i";
276 >        $disk_info .= " name=\"" . $packet{"packet.disk.p$i.attributes.name"} . "\"";
277 >        $disk_info .= " kbytes=\"" . $packet{"packet.disk.p$i.attributes.kbytes"} . "\"";
278 >        $disk_info .= " used=\"" . $packet{"packet.disk.p$i.attributes.used"} . "\"";
279 >        $disk_info .= " avail=\"" . $packet{"packet.disk.p$i.attributes.avail"} . "\"";
280 >        $disk_info .= " mount=\"" . $packet{"packet.disk.p$i.attributes.mount"} . "\"";
281 >        $disk_info .= "></p$i>";
282          ++$i;
283      }
284      $disk_info .= "</disk>";
285  
286 <    my($hostname) = hostname();
172 <    $hostname =~ s/^([^\.]*?).*$/$1/;
173 <    my($domainname) = `cat /etc/resolv.conf`;
174 <    $domainname =~ s/domain\s*([^\s]*?)/$1/;
175 <    my($machine_name) = "$hostname.$domainname";
176 <    my($ip) = inet_ntoa(scalar(gethostbyname($hostname)) || 'localhost');
286 >    my($ip) = inet_ntoa(scalar(gethostbyname(hostname())) || 'localhost');
287  
288      # Build the XML packet this way, as we can clearly
289      # see the structure and contents... I like this ;-)
290 +    # [Note that the server rejects UDP packets that are
291 +    # larger than 8196 bytes]
292      my($xml) = <<EOF;
293      
294 < <packet seq_no="$seq_no" machine_name="$machine_name" date="$date" type="data" ip="$ip">
294 > <packet seq_no="$seq_no" machine_name="$fqdn" date="$date" type="data" ip="$ip">
295      <load>
296          <load1>$packet{"packet.load.load1"}</load1>
297          <load5>$packet{"packet.load.load5"}</load5>
# Line 191 | Line 303 | sub send_udp_packet() {
303          <platform>$packet{"packet.os.platform"}</platform>
304          <sysname>$packet{"packet.os.sysname"}</sysname>
305          <version>$packet{"packet.os.version"}</version>
306 +        <uptime>$packet{"packet.os.uptime"}</uptime>
307      </os>
308      <users>
309          <count>$packet{"packet.users.count"}</count>
# Line 211 | Line 324 | sub send_udp_packet() {
324          <swap>$packet{"packet.cpu.swap"}</swap>
325      </cpu>
326      <memory>
327 <        <total>$packet{"packet.memory.real"}</total>
327 >        <total>$packet{"packet.memory.total"}</total>
328          <free>$packet{"packet.memory.free"}</free>
329      </memory>
330      <swap>
331 <        <total>$packet{"packet.memory.swap_total"}</total>
332 <        <free>$packet{"packet.memory.swap_free"}</free>
331 >        <total>$packet{"packet.swap.total"}</total>
332 >        <free>$packet{"packet.swap.free"}</free>
333      </swap>
334      $disk_info
335   </packet>
336  
337   EOF
338  
339 +    # Make the packet smaller by stripping out newlines and leading spaces.
340      $xml =~ s/\n\s*//g;
341 <    
341 >
342      my($sock) = new IO::Socket::INET (
343                                        PeerPort => $udp_port,
344                                        PeerAddr => $filter_addr,
345                                        Proto => 'udp'
346 <                                     ) or die "Socket: $!\n";
346 >                                     ) or die "Could not send UDP: $!\n";
347  
348      print $sock $xml or die "Could not send UDP packet: $!\n";
349      close($sock);
350      $seq_no++;
351      print "-";
352 +    
353 +    return;
354   }
355  
356 +
357 +
358 +
359 + #-----------------------------------------------------------------------
360 + # send_tcp_heartbeat
361 + # Establishes a TCP connection to an i-scream filter.
362 + # The heartbeat is used as a guaranteed "I'm alive" delivery mechanism.
363 + #-----------------------------------------------------------------------
364   sub send_tcp_heartbeat() {
365  
366      my($sock) = new IO::Socket::INET(
367                                       PeerAddr => $filter_addr,
368                                       PeerPort => $tcp_port,
369                                       Proto => 'tcp'
370 <                                    ) or die "Could not perform heartbeat via TCP: $!\n";
370 >                                    ) or return;
371 >    if (!defined $sock) {
372 >        print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n";
373 >        &tcp_configure();
374 >        return;
375 >    }
376  
248    die "Could not connect to the i-scream filter: $!\n" unless $sock;
249
377      # Now run through the configuration process.
378      my($response);
379  
380      print $sock "HEARTBEAT\n";
381      $response = <$sock>;
382 <    chop $response;
256 <    if (!$response eq "OK") {
382 >    if (!$response eq "OK\n") {
383          close($sock);
384          print "Server gave wrong response to HEARTBEAT: $response\n";
385 +        &tcp_configure();
386          return;
387      }
388      
389      print $sock "CONFIG\n";
390      $response = <$sock>;
391 <    chop $response;
265 <    if (!$response eq "OK") {
391 >    if (!$response eq "OK\n") {
392          close($sock);
393          print "Server gave wrong response to CONFIG: $response\n";
394 +        &tcp_configure();
395          return;
396      }
397  
398      print $sock "$file_list\n";
399      $response = <$sock>;
400 <    chop $response;
274 <    if (!$response eq "OK") {
400 >    if (!$response eq "OK\n") {
401          close($sock);
402          print "Server gave wrong response to file list: $response\n";
403 +        &tcp_configure();
404          return;
405      }
406      
407      print $sock "$last_modified\n";
408      $response = <$sock>;
409 <    chop $response;
283 <    if ($response eq "ERROR") {
409 >    if ($response eq "ERROR\n") {
410          close($sock);
411 +        print "Server configuration changed.  Reconfiguring with filter manager.\n";
412          &tcp_configure();
413          return;
414      }
415 <    if (!$response eq "OK") {
415 >    if (!$response eq "OK\n") {
416          close($sock);
417          print "Server gave wrong response to HEARTBEAT: $response\n";
418 +        &tcp_configure();
419          return;
420      }
421      
422      print $sock "ENDHEARTBEAT\n";
423      $response = <$sock>;
424 <    chop $response;
297 <    if (!$response eq "OK") {
424 >    if (!$response eq "OK\n") {
425          close($sock);
426          print "Server gave wrong response to ENDHEARTBEAT: $response\n";
427 +        &tcp_configure();
428          return;
429      }
430      
431      close($sock);
432      print "^";
433 +    
434 +    return;
435 + }
436 +
437 + #-----------------------------------------------------------------------
438 + # write_pid
439 + # Writes the PID (process ID) of this instance to $pidfile.
440 + # This is then used by a seperate script to check (and restart) ihost.
441 + #-----------------------------------------------------------------------
442 + sub write_pid() {
443 +    open PID, ">$pidfile";
444 +    print PID $$;
445 +    close PID;
446 +    
447 +    return;
448   }

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