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Lars Strand 2006-11-20 13:39:48 +01:00 committed by Steve Schnepp
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plugins/other/snmp__netstat Executable file
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#!/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;
}