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#!/usr/bin/perl -w |
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|
| 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 |
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# |
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# $Author: pjm2 $ |
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# $Id: ihost.pl,v 1.34 2001/03/22 08:53:59 pjm2 Exp $ |
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#------------------------------------------------------------ |
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|
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$| = 1; |
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|
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use strict; |
| 19 |
use IO::Socket; |
| 20 |
use Sys::Hostname; |
| 21 |
|
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use vars qw ( |
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$filter_manager_addr |
| 24 |
$filter_manager_port |
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$seq_no |
| 26 |
$udp_update_time |
| 27 |
$tcp_update_time |
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$last_udp_time |
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$last_tcp_time |
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$last_modified |
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$udp_port |
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$tcp_port |
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$filter_addr |
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$file_list |
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$fqdn |
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$pidfile |
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$retry_wait |
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); |
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|
| 40 |
if (@ARGV != 2) { |
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die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n"; |
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} |
| 43 |
|
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$filter_manager_addr = $ARGV[0]; |
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$filter_manager_port = $ARGV[1]; |
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|
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$seq_no = 1; |
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$retry_wait = 60; |
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|
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# write our PID to a file |
| 51 |
$pidfile = "/var/tmp/ihost.pid"; |
| 52 |
&write_pid(); |
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|
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&tcp_configure(); |
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&send_udp_packet(); |
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|
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$last_udp_time = time; |
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$last_tcp_time = time; |
| 59 |
while (1) { |
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my($time) = time; |
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if ($time >= $last_udp_time + $udp_update_time) { |
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&send_udp_packet(); |
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$last_udp_time = $time; |
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} |
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if ($time >= $last_tcp_time + $tcp_update_time) { |
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&send_tcp_heartbeat(); |
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$last_tcp_time = $time; |
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} |
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my($next_udp) = $udp_update_time - $time + $last_udp_time; |
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my($next_tcp) = $tcp_update_time - $time + $last_tcp_time; |
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my($delay); |
| 72 |
if ($next_udp < $next_tcp) { |
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$delay = $next_udp |
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} |
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else { |
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$delay = $next_tcp; |
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} |
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sleep $delay; |
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} |
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|
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# we'll probably never get here... |
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`rm -f $pidfile`; |
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exit(0); |
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|
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|
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#----------------------------------------------------------------------- |
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# wait_then_retry |
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# Waits for the period of time specified in $retry_wait, then attempts |
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# to reconfigure with the server. |
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#----------------------------------------------------------------------- |
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sub wait_then_retry() { |
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print "Will retry configuration with filter manager in $retry_wait seconds.\n"; |
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sleep $retry_wait; |
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} |
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|
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|
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#----------------------------------------------------------------------- |
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# tcp_configure |
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# Establishes a TCP connection to the specified i-scream filter manager. |
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# The host then requests details from the server, such as the intervals |
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# at which to send UDP packets. |
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#----------------------------------------------------------------------- |
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sub tcp_configure() { |
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|
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while (1) { |
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my($sock) = new IO::Socket::INET( |
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PeerAddr => $filter_manager_addr, |
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PeerPort => $filter_manager_port, |
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Proto => 'tcp' |
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) or die "Cannot connect!"; |
| 111 |
if (!defined $sock) { |
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print "IHOST ERROR: Could not connect to $filter_manager_addr:$filter_manager_port.\n"; |
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print "Please check that there is an i-scream server at this address.\n"; |
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wait_then_retry(); |
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next; |
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} |
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|
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# Now run through the configuration process... |
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my($response); |
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|
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print $sock "STARTCONFIG\n"; |
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$response = <$sock>; |
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if ($response && !($response eq "OK\n")) { |
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print "The i-scream server rejected the STARTCONFIG command.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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|
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print "Config started okay.\n"; |
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|
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print $sock "LASTMODIFIED\n"; |
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$response = <$sock>; |
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if (!$response) { |
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print "The i-scream server did not return anything for the LASTMODIFIED command.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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chop $response; |
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$last_modified = $response; |
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|
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print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n"; |
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|
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print $sock "FILELIST\n"; |
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$response = <$sock>; |
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if (!$response) { |
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print "The i-scream server did not provide a configuration file list.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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chop $response; |
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$file_list = $response; |
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|
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print "File list obtained: $file_list\n"; |
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|
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print $sock "FQDN\n"; |
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$response = <$sock>; |
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if (!$response) { |
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print "The i-scream server did not tell us our FQDN.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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chop $response; |
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$fqdn = $response; |
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|
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print "FQDN returned: $fqdn\n"; |
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|
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print $sock "UDPUpdateTime\n"; |
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$response = <$sock>; |
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if (!$response) { |
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print "The i-scream server did not give us a UDPUpdateTime.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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chop $response; |
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$udp_update_time = $response; |
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|
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print $sock "TCPUpdateTime\n"; |
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$response = <$sock>; |
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if (!$response) { |
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print "The i-scream server did not give us a TCPUpdateTime.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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chop $response; |
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$tcp_update_time = $response; |
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|
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print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n"; |
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|
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print $sock "ENDCONFIG\n"; |
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$response = <$sock>; |
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if ($response && !($response eq "OK\n")) { |
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print "ENDCONFIG command to server failed. Terminated.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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|
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print "Config ended.\n"; |
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|
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print $sock "FILTER\n"; |
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$response = <$sock>; |
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if (!$response) { |
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print "Failed: Could not get a filter address from the filter manager.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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chop $response; |
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$response =~ /^(.*);(.*);(.*)/; |
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if ($response eq "ERROR") { |
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print "There are no active configured filters for your host.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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($filter_addr, $udp_port, $tcp_port) = ($1, $2, $3); |
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unless (defined($filter_addr) && defined($udp_port) && defined($tcp_port)) { |
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print "Failed: Filter address response from server did not make sense: $response\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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|
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print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n"; |
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|
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print $sock "END\n"; |
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$response = <$sock>; |
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if ($response && ($response eq "OK\n")) { |
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print "Host successfully configured via TCP.\n" |
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} |
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else { |
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print "The server failed the host configuration on the END command.\n"; |
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close($sock); |
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wait_then_retry(); |
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next; |
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} |
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|
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close($sock); |
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|
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print "Configuration finished sucessfully!\n"; |
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last; |
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} |
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return; |
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} |
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|
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|
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|
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|
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#----------------------------------------------------------------------- |
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# send_udp_packet |
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# Sends a UDP packet to an i-scream filter. |
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# The packet contains XML markup describing some of the machine's state. |
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# Receipt of UDP packets is not guaranteed. |
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#----------------------------------------------------------------------- |
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sub send_udp_packet() { |
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|
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my(@statgrab) = `./statgrab.pl`; |
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my(%packet); |
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for (my($i) = 0; $i <= $#statgrab; $i++) { |
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$statgrab[$i] =~ /^([^\s]*) (.*)$/; |
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$packet{$1} = $2; |
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} |
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|
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my($date) = time; |
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|
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my($disk_info) = "<disk>"; |
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my($i) = 0; |
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while (defined $packet{"packet.disk.p$i.attributes.mount"}) { |
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$disk_info .= "<p$i"; |
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$disk_info .= " name=\"" . $packet{"packet.disk.p$i.attributes.name"} . "\""; |
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$disk_info .= " kbytes=\"" . $packet{"packet.disk.p$i.attributes.kbytes"} . "\""; |
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$disk_info .= " used=\"" . $packet{"packet.disk.p$i.attributes.used"} . "\""; |
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$disk_info .= " avail=\"" . $packet{"packet.disk.p$i.attributes.avail"} . "\""; |
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$disk_info .= " mount=\"" . $packet{"packet.disk.p$i.attributes.mount"} . "\""; |
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$disk_info .= "></p$i>"; |
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++$i; |
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} |
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$disk_info .= "</disk>"; |
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|
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my($ip); |
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$ip = inet_ntoa(scalar(gethostbyname(hostname())) || 'localhost') or $ip = 'localhost'; |
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|
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# Build the XML packet this way, as we can clearly |
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# see the structure and contents... I like this ;-) |
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# [Note that the server rejects UDP packets that are |
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# larger than 8196 bytes] |
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my($xml) = <<EOF; |
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|
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<packet seq_no="$seq_no" machine_name="$fqdn" date="$date" type="data" ip="$ip"> |
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<load> |
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<load1>$packet{"packet.load.load1"}</load1> |
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<load5>$packet{"packet.load.load5"}</load5> |
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<load15>$packet{"packet.load.load15"}</load15> |
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</load> |
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<os> |
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<name>$packet{"packet.os.name"}</name> |
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<release>$packet{"packet.os.release"}</release> |
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<platform>$packet{"packet.os.platform"}</platform> |
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<sysname>$packet{"packet.os.sysname"}</sysname> |
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<version>$packet{"packet.os.version"}</version> |
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<uptime>$packet{"packet.os.uptime"}</uptime> |
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</os> |
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<users> |
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<count>$packet{"packet.users.count"}</count> |
| 311 |
<list>$packet{"packet.users.list"}</list> |
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</users> |
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<processes> |
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<total>$packet{"packet.processes.total"}</total> |
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<sleeping>$packet{"packet.processes.sleeping"}</sleeping> |
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<zombie>$packet{"packet.processes.zombie"}</zombie> |
| 317 |
<stopped>$packet{"packet.processes.stopped"}</stopped> |
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<cpu>$packet{"packet.processes.cpu"}</cpu> |
| 319 |
</processes> |
| 320 |
<cpu> |
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<idle>$packet{"packet.cpu.idle"}</idle> |
| 322 |
<user>$packet{"packet.cpu.user"}</user> |
| 323 |
<kernel>$packet{"packet.cpu.kernel"}</kernel> |
| 324 |
<iowait>$packet{"packet.cpu.iowait"}</iowait> |
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<swap>$packet{"packet.cpu.swap"}</swap> |
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</cpu> |
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<memory> |
| 328 |
<total>$packet{"packet.memory.total"}</total> |
| 329 |
<free>$packet{"packet.memory.free"}</free> |
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</memory> |
| 331 |
<swap> |
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<total>$packet{"packet.swap.total"}</total> |
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<free>$packet{"packet.swap.free"}</free> |
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</swap> |
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$disk_info |
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</packet> |
| 337 |
|
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EOF |
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|
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# Make the packet smaller by stripping out newlines and leading spaces. |
| 341 |
$xml =~ s/\n\s*//g; |
| 342 |
|
| 343 |
my($sock) = new IO::Socket::INET ( |
| 344 |
PeerPort => $udp_port, |
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PeerAddr => $filter_addr, |
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Proto => 'udp' |
| 347 |
) or die "Could not send UDP: $!\n"; |
| 348 |
|
| 349 |
print $sock $xml or die "Could not send UDP packet: $!\n"; |
| 350 |
close($sock); |
| 351 |
$seq_no++; |
| 352 |
print "-"; |
| 353 |
|
| 354 |
return; |
| 355 |
} |
| 356 |
|
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|
| 358 |
|
| 359 |
|
| 360 |
#----------------------------------------------------------------------- |
| 361 |
# send_tcp_heartbeat |
| 362 |
# Establishes a TCP connection to an i-scream filter. |
| 363 |
# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism. |
| 364 |
# If we need to reconfigure, then we complete the heartbeat before |
| 365 |
# doing so. |
| 366 |
#----------------------------------------------------------------------- |
| 367 |
sub send_tcp_heartbeat() { |
| 368 |
|
| 369 |
my ($doReconfigure) = 0; |
| 370 |
|
| 371 |
my($sock) = new IO::Socket::INET( |
| 372 |
PeerAddr => $filter_addr, |
| 373 |
PeerPort => $tcp_port, |
| 374 |
Proto => 'tcp' |
| 375 |
) or return; |
| 376 |
if (!defined $sock) { |
| 377 |
print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n"; |
| 378 |
&tcp_configure(); |
| 379 |
return; |
| 380 |
} |
| 381 |
|
| 382 |
# Now run through the configuration process. |
| 383 |
my($response); |
| 384 |
|
| 385 |
print $sock "HEARTBEAT\n"; |
| 386 |
$response = <$sock>; |
| 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 |
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 |
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 |
if ($response eq "ERROR\n") { |
| 415 |
close($sock); |
| 416 |
print "Server configuration changed. Reconfiguring with filter manager.\n"; |
| 417 |
$doReconfigure = 1; |
| 418 |
} |
| 419 |
if (!$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 |
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 |
} |
