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/usr/local/nagios/libexec/check_netstat_conn -p <port>

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#!/bin/sh
# 
# check_netstat_conn - Check listening ports using netstat utility
#
# Author:	Aaron Eidt ([email protected])
#

STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4

PROGRAM="check_netstat_conn"

usage () {
	printf "\n%s - Check port using netstat utility\n" $0
	printf "$Id: $PROGRAM 1 2013-07-08 $"
	printf "\nUsage: %s: -p\n\n" $0
}


port=

while getopts p: o
do
	case $o in
		p)
			port="$OPTARG"
			;;
		?)
			usage
			exit ${STATE_UNKNOWN}
			;;
	esac
done

if [ x$port = x ]; then
	usage
	exit ${STATE_UNKNOWN}
fi

$ENV{PATH}=$ENV{PATH}:/usr/local/nagios/libexec/
NETSTAT=`which netstat`

if [ ! -e $NETSTAT ]; then
	echo "CANNOT FIND NETSTAT!"
	exit ${STATE_UNKNOWN}
fi

result=`$NETSTAT -an | grep :$port`
num_conn=`echo $result | wc -l`

if [ `echo $result | egrep -c 'LISTEN|ESTABLISHED'` -gt 1 ]; then
	echo "OK: There are $num_conn established or listening connections on port $port"
	exit ${STATE_OK}
fi

echo "CRITICAL: There are NO established or listening connections on port $port"
exit ${STATE_CRITICAL}