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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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$tcp_port |
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$filter_addr |
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$file_list |
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$fqdn |
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$pidfile |
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); |
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|
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if (@ARGV != 2) { |
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|
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$seq_no = 1; |
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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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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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|
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# we'll probably never get here... |
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`rm -f $pidfile`; |
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exit(0); |
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|
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|
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#----------------------------------------------------------------------- |
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# tcp_configure |
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# Establishes a TCP connection to the specified i-scream filter manager. |
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# The host then requests details from the server, such as the intervals |
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# at which to send UDP packets. |
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#----------------------------------------------------------------------- |
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sub tcp_configure() { |
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my($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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) 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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print "Program ended.\n"; |
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exit(1); |
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} |
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|
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die "Could not connect to the i-scream filter manager: $!\n" unless $sock; |
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|
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# Now run through the configuration process. |
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# Now run through the configuration process... |
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my($response); |
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print $sock "STARTCONFIG\n"; |
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print "File list obtained: $file_list\n"; |
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print $sock "FQDN\n"; |
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$response = <$sock>; |
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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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chop $response; |
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|
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print $sock "FILTER\n"; |
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$response = <$sock>; |
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unless (defined($response)) { |
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print "Failed: Could not get a filter address from the filter manager.\n"; |
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exit(1); |
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} |
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chop $response; |
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$response =~ /(.*);(.*);(.*)/; |
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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: $response\n"; |
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exit(1); |
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} |
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print "Got filter data ($filter_addr, $udp_port, $tcp_port)\n"; |
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close($sock); |
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print "Configuration finished sucessfully!\n"; |
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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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# 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} = $2; |
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} |
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my($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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$disk_info .= qq/<name>$packet{"packet.disk.p$i.attributes.name"}<\/name>/; |
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$disk_info .= qq/<kbytes>$packet{"packet.disk.p$i.attributes.kbytes"}<\/kbytes>/; |
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$disk_info .= qq/<used>$packet{"packet.disk.p$i.attributes.used"}<\/used>/; |
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$disk_info .= qq/<avail>$packet{"packet.disk.p$i.attributes.avail"}<\/avail>/; |
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$disk_info .= qq/<mount>$packet{"packet.disk.p$i.attributes.mount"}<\/mount>/; |
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$disk_info .= "</p$i>"; |
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$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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my($hostname) = hostname(); |
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$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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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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<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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<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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|
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EOF |
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# Make the packet smaller by stripping out newlines and leading spaces. |
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$xml =~ s/\n\s*//g; |
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< |
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> |
|
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my($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 "Socket: $!\n"; |
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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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$seq_no++; |
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print "-"; |
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+ |
|
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return; |
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} |
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|
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+ |
|
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+ |
|
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|
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#----------------------------------------------------------------------- |
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# send_tcp_heartbeat |
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# Establishes a TCP connection to an i-scream filter. |
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+ |
# The heartbeat is used as a guaranteed "I'm alive" delivery mechanism. |
| 304 |
+ |
#----------------------------------------------------------------------- |
| 305 |
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sub send_tcp_heartbeat() { |
| 306 |
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|
| 307 |
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my($sock) = new IO::Socket::INET( |
| 308 |
|
PeerAddr => $filter_addr, |
| 309 |
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PeerPort => $tcp_port, |
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|
Proto => 'tcp' |
| 311 |
< |
) or die "Could not perform heartbeat via TCP: $!\n"; |
| 311 |
> |
) or return; |
| 312 |
> |
if (!defined $sock) { |
| 313 |
> |
print "IHOST WARNING: Failed to deliver a heartbeat to the i-scream filter.\n"; |
| 314 |
> |
return; |
| 315 |
> |
} |
| 316 |
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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); |
| 319 |
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|
| 320 |
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print $sock "HEARTBEAT\n"; |
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$response = <$sock>; |
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+ |
return if (!defined $response); |
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chop $response; |
| 324 |
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if (!$response eq "OK") { |
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close($sock); |
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|
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print $sock "CONFIG\n"; |
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$response = <$sock>; |
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+ |
return if (!defined $response); |
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chop $response; |
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if (!$response eq "OK") { |
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close($sock); |
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|
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print $sock "$file_list\n"; |
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$response = <$sock>; |
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+ |
return if (!defined $response); |
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chop $response; |
| 344 |
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if (!$response eq "OK") { |
| 345 |
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close($sock); |
| 349 |
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|
| 350 |
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print $sock "$last_modified\n"; |
| 351 |
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$response = <$sock>; |
| 352 |
+ |
return if (!defined $response); |
| 353 |
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chop $response; |
| 354 |
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if ($response eq "ERROR") { |
| 355 |
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close($sock); |
| 364 |
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|
| 365 |
|
print $sock "ENDHEARTBEAT\n"; |
| 366 |
|
$response = <$sock>; |
| 367 |
+ |
return if (!defined $response); |
| 368 |
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chop $response; |
| 369 |
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if (!$response eq "OK") { |
| 370 |
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close($sock); |
| 374 |
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|
| 375 |
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close($sock); |
| 376 |
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print "^"; |
| 377 |
+ |
|
| 378 |
+ |
return; |
| 379 |
+ |
} |
| 380 |
+ |
|
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#----------------------------------------------------------------------- |
| 382 |
+ |
# write_pid |
| 383 |
+ |
# Writes the PID (process ID) of this instance to $pidfile. |
| 384 |
+ |
# This is then used by a seperate script to check (and restart) ihost. |
| 385 |
+ |
#----------------------------------------------------------------------- |
| 386 |
+ |
sub write_pid() { |
| 387 |
+ |
open PID, ">$pidfile"; |
| 388 |
+ |
print PID $$; |
| 389 |
+ |
close PID; |
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+ |
|
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+ |
return; |
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} |
