Nagios Plugin for IPTABLES Monitoring

Greetings!

Could someone send me nagios plugin which is tested and works well for monitoring IPTABLES in Linux.

I have tested below script but it is not returning correct output to nagios server.

If I execute script manually, it shows correct output...

But if I execute via  ./check_nrpe - H localhost -c check_iptables,  it shows wrong output.



Below is my plugin
------------------------------

#!/bin/bash
set -x

IPT='/sbin/iptables'
GREP='/bin/grep'
AWK='/bin/awk'
EXPR='/usr/bin/expr'
WC='/usr/bin/wc'
A='/usr/bin/sudo'

E_SUCCESS="0"
E_CRITICAL="2"
E_UNKNOWN="3"

CHAINS=`$A $IPT -nvL | $GREP 'Chain' | $AWK '{ print $2 }'| $GREP Cid | $WC -l`

                if [ $CHAINS -ne 0 ] ; then
                        echo "Firewall is running!"
                        exit ${E_SUCCESS}

                elif [ $CHAINS -eq 0 ] ; then
                        echo "Firewall is not running"
                        exit ${E_CRITICAL}
                fi

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