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159 lines
5.3 KiB
Perl
Executable file
159 lines
5.3 KiB
Perl
Executable file
#!/usr/bin/perl -w
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#
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# Copyright (C) 2006 Lars Strand
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#
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# Munin plugin to monitor network connection by use of SNMP.
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# Based on snmp__df plugin.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2 dated June,
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# 1991.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# $Log$
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#
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#%# family=snmpauto
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#%# capabilities=snmpconf
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use strict;
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use Net::SNMP;
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my $DEBUG = 0;
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my $host = $ENV{host} || undef;
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my $port = $ENV{port} || 161;
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my $community = $ENV{community} || "public";
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my $response;
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my %tcpStates = ( 1 => [0, "GAUGE", "closed", "Connections waiting for a termination request acknowledgment from the remote TCP."],
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2 => [0, "GAUGE", "listen", "Connections waiting for a request from any remote TCP and port."],
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3 => [0, "GAUGE", "synSent", "Connections waiting for a matching request after having sent a connection request."],
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4 => [0, "GAUGE", "synReceived", "Connections waiting for a confirming request acknowledgment after having both received and sent a connection request."],
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5 => [0, "GAUGE", "established", "Connections opened and data received can be delivered to the user. The normal state for the data transfer phase of the connection."],
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6 => [0, "GAUGE", "finWait1", "Connections waiting for a termination request from the remote TCP, or an acknowledgment of the connection termination request previously sent."],
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7 => [0, "GAUGE", "finWait2", "Connections waiting for a termination request from the remote TCP."],
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8 => [0, "GAUGE", "closeWait", "Connections waiting for a termination request from the local user."],
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9 => [0, "GAUGE", "lastAck", "Connections waiting for an acknowledgment of the termination request previously sent to the remote TCP (which includes an acknowledgment of its connection termination request)."],
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10 => [0, "GAUGE", "closing", "Connections waiting for a termination request acknowledgment from the remote TCP."],
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11 => [0, "GAUGE", "timeWait", "Connections waiting for enough time to pass to be sure the remote TCP received the acknowledgment of its termination request."],
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12 => [0, "GAUGE", "deleteTCP", "Connections terminated by a SNMP Managment Station (put)"]
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);
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if (defined $ARGV[0] and $ARGV[0] eq "snmpconf")
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{
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print "require 1.3.6.1.2.1.6.13.1.1. [0-9]\n";
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exit 0;
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}
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if ($0 =~ /^(?:|.*\/)snmp_([^_]+)_netstat$/)
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{
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$host = $1;
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if ($host =~ /^([^:]+):(\d+)$/)
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{
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$host = $1;
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$port = $2;
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}
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}
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elsif (!defined($host))
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{
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print "# Debug: $0 -- $1\n" if $DEBUG;
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die "# Error: couldn't understand what I'm supposed to monitor.";
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}
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if (defined $ARGV[0] and $ARGV[0] eq "config")
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{
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print "host_name $host\n";
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print "graph_title Netstat\n";
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print "graph_args -l 0 --base 1000\n";
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print "graph_period seconds\n";
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print "graph_category network\n";
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print "graph_order closed listen synSent synReceived established finWait1 finWait2 closeWait lastAck closing timeWait deleteTCP\n";
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print "graph_vlabel active connection\n";
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print "graph_info This graph shows the TCP activity of all the network interfaces combined.\n";
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foreach my $state (keys %tcpStates) {
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print "$tcpStates{$state}[2].label $tcpStates{$state}[2]\n";
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print "$tcpStates{$state}[2].type $tcpStates{$state}[1]\n";
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print "$tcpStates{$state}[2].max 50000\n";
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print "$tcpStates{$state}[2].min 0\n";
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print "$tcpStates{$state}[2].info $tcpStates{$state}[3]\n";
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}
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exit 0;
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}
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my $tcpConnState = "1.3.6.1.2.1.6.13.1.1.";
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my ($session, $error) = Net::SNMP->session(
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-hostname => $host,
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-community => $community,
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-port => $port
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);
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if (!defined ($session))
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{
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die "Croaking: $error";
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}
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my $connections = get_by_regex($session, $tcpConnState, "[1-9]");
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# the values
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while (my ($id, $state) = each(%$connections)) {
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$tcpStates{$state}[0] += 1;
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}
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foreach my $state (keys %tcpStates) {
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print "$tcpStates{$state}[2].value $tcpStates{$state}[0]\n";
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}
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sub get_by_regex
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{
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my $handle = shift;
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my $oid = shift;
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my $regex = shift;
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my $result = {};
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my $num = 0;
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my $ret = $oid . "0";
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my $response;
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print "# Starting browse of $oid...\n" if $DEBUG;
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while (1)
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{
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if ($num == 0)
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{
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print "# Checking for $ret...\n" if $DEBUG;
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$response = $handle->get_request ($ret);
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}
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if ($num or !defined $response)
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{
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print "# Checking for sibling of $ret...\n" if $DEBUG;
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$response = $handle->get_next_request ($ret);
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}
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if (!$response)
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{
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return undef;
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}
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my @keys = keys %$response;
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$ret = $keys[0];
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print "# Analyzing $ret (compared to $oid)...\n" if $DEBUG;
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last unless ($ret =~ /^$oid/);
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$num++;
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next unless ($response->{$ret} =~ /$regex/);
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@keys = split (/\./, $ret);
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$result->{$keys[-1]} = $response->{$ret};;
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print "# Index $num: ", $keys[-1], " (", $response->{$ret}, ")\n" if $DEBUG;
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};
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return $result;
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}
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