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#!/usr/bin/perl -w |
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|
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# ----------------------------------------------------------- |
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# Perl i-scream Host. |
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# http://www.i-scream.org.uk |
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# |
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# An all-in-one script to act as an i-scream host on |
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# a typical Unix/Linux box. |
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# |
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# $Author: tdb1 $ |
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# $Id: ihost.pl,v 1.38 2001/11/19 15:07:56 tdb1 Exp $ |
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#------------------------------------------------------------ |
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|
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$| = 1; |
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|
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use strict; |
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use IO::Socket; |
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use Sys::Hostname; |
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|
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use vars qw ( |
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$filter_manager_addr |
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$filter_manager_port |
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$seq_no |
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$udp_update_time |
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$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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@data |
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); |
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|
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if (@ARGV != 2) { |
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die "Usage: ihost.pl [i-scream filter manager] [TCP port]\n"; |
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} |
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|
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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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$retry_wait = 60; |
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|
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# write our PID to a file |
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$pidfile = "/var/tmp/ihost.pid"; |
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&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; |
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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); |
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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!"; |
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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($sock); |
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|
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print "Configuration finished sucessfully!\n"; |
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last; |
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} |
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return; |
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} |
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|
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|
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#----------------------------------------------------------------------- |
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# send_udp_packet |
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# Sends a UDP packet to an i-scream filter. |
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# The packet contains XML markup describing some of the machine's state. |
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# Receipt of UDP packets is not guaranteed. |
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#----------------------------------------------------------------------- |
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sub send_udp_packet() { |
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|
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my($plugins_dir) = "plugins"; |
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|
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opendir PLUGINS, $plugins_dir; |
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my(@plugins) = readdir PLUGINS; |
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foreach my $plugin (@plugins) { |
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push @data, `$plugins_dir/$plugin` if -x "$plugins_dir/$plugin" && -f "$plugins_dir/$plugin"; |
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} |
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|
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# get some extra data |
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my($date) = time; |
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my($ip); |
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$ip = inet_ntoa(scalar(gethostbyname(hostname())) || 'localhost') or $ip = 'localhost'; |
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|
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# add some extra data to the array |
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push(@data, "packet.attributes.seq_no=$seq_no"); |
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push(@data, "packet.attributes.machine_name=$fqdn"); |
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push(@data, "packet.attributes.date=$date"); |
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push(@data, "packet.attributes.type=data"); |
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push(@data, "packet.attributes.ip=$ip"); |
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|
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# sort the data |
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@data = sort(@data); |
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|
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# turn the array into some nice XML |
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my($xml) = &make_xml("", ""); |
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|
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my($sock) = new IO::Socket::INET ( |
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PeerPort => $udp_port, |
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PeerAddr => $filter_addr, |
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Proto => 'udp' |
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) or die "Could not send UDP: $!\n"; |
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|
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print $sock $xml or die "Could not send UDP packet: $!\n"; |
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close($sock); |
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$seq_no++; |
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print "-"; |
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|
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return; |
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} |
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|
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|
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#----------------------------------------------------------------------- |
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# send_tcp_heartbeat |
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# Establishes a TCP connection to an i-scream filter. |
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# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism. |
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# If we need to reconfigure, then we complete the heartbeat before |
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# doing so. |
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#----------------------------------------------------------------------- |
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sub send_tcp_heartbeat() { |
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|
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my ($doReconfigure) = 0; |
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|
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my($sock) = new IO::Socket::INET( |
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PeerAddr => $filter_addr, |
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PeerPort => $tcp_port, |
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Proto => 'tcp' |
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) or return; |
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if (!defined $sock) { |
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print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n"; |
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&tcp_configure(); |
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return; |
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} |
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|
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# Now run through the configuration process. |
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my($response); |
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|
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print $sock "HEARTBEAT\n"; |
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$response = <$sock>; |
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if (!$response eq "OK\n") { |
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close($sock); |
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print "Server gave wrong response to HEARTBEAT: $response\n"; |
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&tcp_configure(); |
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return; |
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} |
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|
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print $sock "CONFIG\n"; |
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$response = <$sock>; |
| 337 |
if (!$response eq "OK\n") { |
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close($sock); |
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print "Server gave wrong response to CONFIG: $response\n"; |
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&tcp_configure(); |
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return; |
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} |
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|
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print $sock "$file_list\n"; |
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$response = <$sock>; |
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if (!$response eq "OK\n") { |
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close($sock); |
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print "Server gave wrong response to file list: $response\n"; |
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&tcp_configure(); |
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return; |
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} |
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|
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print $sock "$last_modified\n"; |
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$response = <$sock>; |
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if ($response eq "ERROR\n") { |
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close($sock); |
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print "Server configuration changed. Reconfiguring with filter manager.\n"; |
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$doReconfigure = 1; |
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} |
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if (!$response eq "OK\n") { |
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close($sock); |
| 362 |
print "Server gave wrong response to HEARTBEAT: $response\n"; |
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&tcp_configure(); |
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return; |
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} |
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|
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print $sock "ENDHEARTBEAT\n"; |
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$response = <$sock>; |
| 369 |
if (!$response eq "OK\n") { |
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close($sock); |
| 371 |
print "Server gave wrong response to ENDHEARTBEAT: $response\n"; |
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&tcp_configure(); |
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return; |
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} |
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|
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close($sock); |
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print "^"; |
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|
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&tcp_configure() if $doReconfigure; |
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|
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return; |
| 382 |
} |
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|
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|
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#----------------------------------------------------------------------- |
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# write_pid |
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# Writes the PID (process ID) of this instance to $pidfile. |
| 388 |
# This is then used by a seperate script to check (and restart) ihost. |
| 389 |
#----------------------------------------------------------------------- |
| 390 |
sub write_pid() { |
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open PID, ">$pidfile"; |
| 392 |
print PID $$; |
| 393 |
close PID; |
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|
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return; |
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} |
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|
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#----------------------------------------------------------------------- |
| 399 |
# make_xml |
| 400 |
# Turns an array of plugins data into an XML string. |
| 401 |
#----------------------------------------------------------------------- |
| 402 |
sub make_xml() { |
| 403 |
my($curlevel, $curline) = @_; |
| 404 |
my($xmltemp) = ""; my($curtag) = ""; my($attributes) = ""; |
| 405 |
while(true) { |
| 406 |
$curline = shift(@data) if $curline eq ""; chomp $curline; |
| 407 |
if($curline =~ /^$curlevel([^\.\s]+\.)/) { |
| 408 |
$curtag=$1; |
| 409 |
} |
| 410 |
if($curline =~ /^$curlevel$curtag([^\.\s]+)\s+(.*)$/) { |
| 411 |
$xmltemp .= "<$1$attributes>$2</$1>"; |
| 412 |
} |
| 413 |
elsif($curline =~ /^$curlevel$curtag(attributes)\.([^\.=]+)=(.*)$/) { |
| 414 |
$attributes .= " $2=\"$3\""; |
| 415 |
} |
| 416 |
else { |
| 417 |
$xmltemp .= &make_xml("$curlevel$curtag", $curline); |
| 418 |
} |
| 419 |
my($nextline) = $data[0]; chomp $nextline if defined $nextline; |
| 420 |
$curtag =~ s/(.*)\./$1/; |
| 421 |
if(defined $nextline && $nextline =~ /^$curlevel$curtag\./) { |
| 422 |
$curline = ""; |
| 423 |
} |
| 424 |
else { |
| 425 |
$xmltemp = "<$curtag$attributes>$xmltemp</$curtag>" unless $curtag eq ""; |
| 426 |
return $xmltemp; |
| 427 |
} |
| 428 |
} |
| 429 |
} |
