Port Check with Nagios

Multiple Port Check Plugin for Nagios

#!/bin/bash
#
# Usage: .//check_system_pp
#
# Discription:
# This plugin determine whether the server
# is running properly. It will check the following:
# * Are all the required TCP/IP ports open or not?
#
# Created:      25.12.2011 (IN)
#
#
#

##################################################################################
##
#
# Ports to check

PORT1="21"
PORT2="22"
PORT3="53"
PORT4="80"

##################################################################################

PATH="/usr/bin:/usr/sbin:/bin:/sbin"

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

print_gpl() {
    echo "This program is free software; you can redistribute it and/or modify"
    echo "it under the terms of the GNU General Public License as published by"
    echo "the Free Software Foundation; either version 2 of the License, or"
    echo "(at your option) any later version."
    echo ""
    echo "This program is distributed in the hope that it will be useful,"
    echo "but WITHOUT ANY WARRANTY; without even the implied warranty of"
    echo "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the"
    echo "GNU General Public License for more details."
    echo ""
    echo "You should have received a copy of the GNU General Public License"
    echo "along with this program; if not, write to the Free Software"
    echo "Nilesh Kumar, New delhi 110067, India"
}

print_help(){
        echo "System process and port check script for Nagios."
        echo "Tested on RHE3/4/5/6, CentOS 4/5/6, Fedora 4, Solaris 9"
        echo ""
        echo "Usage: ./check_system_pp"
        echo "Website: http://www.nagiosexchange.org"
        echo ""
    print_gpl
}

while test -n "$1"
do
        case "$1" in
          *) print_help; exit $STATE_OK;;
        esac
done

check_port1()
{
        PORTS="0"
        ERROR_PORTS=""
        for NUM in `echo $PORT1`; do
                if [ `nmap 127.0.0.1 --system-dns | grep -w $NUM | grep -v grep | wc -l` -lt 1 ]; then
                        PORTS=1
                        ERROR_PORTS="$ERROR_PORTS""$NUM ";
                fi
        done

        if [ $PORTS -eq "1" ]; then
                exit_port1=$STATE_CRITICAL
        elif [ $PORTS -eq "0" ]; then
        exit_port1=$STATE_OK
    fi
}
check_port1

check_port2()
{
        PORTS="0"
        ERROR_PORTS=""
        for NUM in `echo $PORT2`; do
                if [ `nmap 127.0.0.1 --system-dns | grep -w $NUM | grep -v grep | wc -l` -lt 1 ]; then
                        PORTS=1
                        ERROR_PORTS="$ERROR_PORTS""$NUM ";
                fi
        done

        if [ $PORTS -eq "1" ]; then
                exit_port2=$STATE_CRITICAL
        elif [ $PORTS -eq "0" ]; then
        exit_port2=$STATE_OK
    fi
}
check_port2

check_port3()
{
        PORTS="0"
        ERROR_PORTS=""
        for NUM in `echo $PORT3`; do
                if [ `nmap 127.0.0.1 --system-dns | grep -w $NUM | grep -v grep | wc -l` -lt 1 ]; then
                        PORTS=1
                        ERROR_PORTS="$ERROR_PORTS""$NUM ";
                fi
        done

        if [ $PORTS -eq "1" ]; then
                exit_port3=$STATE_CRITICAL
        elif [ $PORTS -eq "0" ]; then
        exit_port3=$STATE_OK
    fi
}
check_port3

check_port4()
{
        PORTS="0"
        ERROR_PORTS=""
        for NUM in `echo $PORT4`; do
                if [ `nmap 127.0.0.1 --system-dns | grep -w $NUM | grep -v grep | wc -l` -lt 1 ]; then
                        PORTS=1
                        ERROR_PORTS="$ERROR_PORTS""$NUM ";
                fi
        done

        if [ $PORTS -eq "1" ]; then
                exit_port4=$STATE_CRITICAL
        elif [ $PORTS -eq "0" ]; then
        exit_port4=$STATE_OK
    fi
}
check_port4

port_exit1=`expr $exit_port1`
port_exit2=`expr $exit_port2`
port_exit3=`expr $exit_port3`
port_exit4=`expr $exit_port4`

#
if [ $port_exit1 -eq "0" ]; then
    p1u=$PORT1,; else
    p1d=$PORT1,
fi
#
if [ $port_exit2 -eq "0" ]; then
    p2u=$PORT2,; else
    p2d=$PORT2,
fi
#
if [ $port_exit3 -eq "0" ]; then
    p3u=$PORT3,; else
    p3d=$PORT3,
fi
#
if [ $port_exit4 -eq "0" ]; then
    p4u=$PORT4; else
    p4d=$PORT4
fi
#

UP=`echo $p1u $p2u $p3u $p4u`
DOWN=`echo $p1d $p2d $p3d $p4d`

final_exit=`expr $exit_port1 + $exit_port2 + $exit_port3 + $exit_port4`

if [ $final_exit -eq "0" ]; then
    echo "Port $p1u $p2u $p3u $p4u UP and no any port DOWN"
    exitstatus=$STATE_OK
elif [ $final_exit -eq "1" ]; then
    echo "Port $p1u $p2u $p3u $p4u UP and Port $p1d $p2d $p3d $p4d DOWN"
    exitstatus=$STATE_WARNING
elif [ $final_exit -ge "1" ]; then
    echo "Port $p1u $p2u $p3u $p4u UP and Port $p1d $p2d $p3d $p4d DOWN"
    exitstatus=$STATE_CRITICAL
fi

exit $exitstatus