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