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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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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 $sock "STARTCONFIG\n"; |
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close($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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# 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="$ip"> |
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EOF |
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# Make the packet smaller by stripping out newlines and leading spaces. |
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$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 $sock; |
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– |
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# Now run through the configuration process. |
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my($response); |
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close($sock); |
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print "^"; |
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return; |
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} |
