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#!/usr/local/bin/perl -w |
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#!/usr/bin/perl -w |
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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. You may adapt the data-gathering |
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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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if (time >= $last_udp_time + $udp_update_time) { |
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my($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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$last_udp_time = $time; |
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} |
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if (time >= $last_tcp_time + $tcp_update_time) { |
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if ($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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$last_tcp_time = $time; |
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} |
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`sleep 1`; |
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my($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 $delay`; |
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} |
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exit(0); |
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#----------------------------------------------------------------------- |
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# tcp_configure |
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# Establishes a TCP connection to the specified i-scream filter manager. |
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# The host then requests details from the server, such as the intervals |
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# at which to send UDP packets. |
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#----------------------------------------------------------------------- |
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sub tcp_configure() { |
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my($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 "Could not perform configuration via TCP: $!\n"; |
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); |
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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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print "Program ended.\n"; |
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exit(1); |
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} |
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die "Could not connect to the i-scream filter manager: $!\n" unless $sock; |
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# Now run through the configuration process. |
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# Now run through the configuration process... |
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my($response); |
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print $sock "STARTCONFIG\n"; |
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chop $response; |
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$last_modified = $response; |
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print "Config last modified: ". scalar localtime $last_modified . "\n"; |
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print "Config last modified: ". (scalar localtime $last_modified/1000) . "\n"; |
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print $sock "FILELIST\n"; |
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$response = <$sock>; |
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chop $response; |
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$tcp_update_time = $response; |
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print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time.\n"; |
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print "UDP packet period: $udp_update_time seconds.\nTCP heartbeat period: $tcp_update_time seconds.\n"; |
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print $sock "ENDCONFIG\n"; |
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$response = <$sock>; |
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close($sock); |
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print "Configuration finished sucessfully!\n"; |
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return; |
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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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my(@statgrab) = `./statgrab.pl`; |
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my(%packet); |
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for (my($i) = 0; $i < $#statgrab; $i++) { |
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for (my($i) = 0; $i <= $#statgrab; $i++) { |
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$statgrab[$i] =~ /^([^\s]*) (.*)$/; |
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$packet{$1} = $2; |
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} |
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} |
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$disk_info .= "</disk>"; |
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print "$disk_info\n"; |
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my($hostname) = hostname(); |
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($hostname = $hostname) =~ /^([^\.]*?)/; |
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print $hostname; |
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my($domainname) = `cat /etc/resolv.conf`; |
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$domainname =~ s/domain\s*([^\s]*?)/$1/; |
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$hostname =~ s/\..*$//g; |
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`cat /etc/resolv.conf` =~ /domain\s+([^\s]+)/; |
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my($domainname) = $1; |
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my($machine_name) = "$hostname.$domainname"; |
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my($ip) = inet_ntoa(scalar(gethostbyname($hostname)) || 'localhost'); |
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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($xml) = <<EOF; |
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<packet seq_no="$seq_no" machine_name="$machine_name" date="$date" type="data" ip="$ip"> |
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<platform>$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> |
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<swap>$packet{"packet.cpu.swap"}</swap> |
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</cpu> |
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<memory> |
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<total>$packet{"packet.memory.real"}</total> |
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<total>$packet{"packet.memory.total"}</total> |
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<free>$packet{"packet.memory.free"}</free> |
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</memory> |
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<swap> |
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<total>$packet{"packet.memory.swap_total"}</total> |
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<free>$packet{"packet.memory.swap_free"}</free> |
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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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$disk_info |
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</packet> |
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EOF |
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# Make the packet smaller by stripping out newlines and leading spaces. |
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$xml =~ s/\n\s*//g; |
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my($sock) = new IO::Socket::INET ( |
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close($sock); |
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$seq_no++; |
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print "-"; |
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return; |
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} |
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#----------------------------------------------------------------------- |
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# send_tcp_heartbeat |
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# Establishes a TCP connection to an i-scream filter. |
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# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism. |
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#----------------------------------------------------------------------- |
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sub send_tcp_heartbeat() { |
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my($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 die "Could not perform heartbeat via TCP: $!\n"; |
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); |
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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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return; |
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} |
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die "Could not connect to the i-scream filter: $!\n" unless $sock; |
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# Now run through the configuration process. |
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my($response); |
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close($sock); |
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print "^"; |
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return; |
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} |
