check_pf_state_table

#!/bin/sh

if [ "$1" = "-w" ] && [ "$2" -gt "0" ] && [ "$3" = "-c" ] && [ "$4" -gt "0" ] ; then
        WARN=$2
        CRIT=$4
STATES=`pfctl -si | grep "current entries" | awk '{ print $3 }'`
LIMIT=`pfctl -sm | grep states | awk '{ print $4 }'`
#PERC=`echo "$((($STATES*100)/$LIMIT))"|bc`
PERC=`expr $STATES \* 100 / $LIMIT`

#echo $PERC
#echo $PERC2

if [ $PERC -lt $WARN ]; then
        MSG="OK"
        STATUS="0"
elif [ $PERC -ge $CRIT ]; then
        MSG="CRITICAL"
        STATUS="2"
elif [ $PERC -ge $WARN ]; then
        MSG="WARNING"
        STATUS="1"
fi
echo "$MSG - PF state table: $STATES ( $PERC% full - limit: $LIMIT) | current_states=$STATES;state_limit=$LIMIT;percent_used=$PERC"
exit $STATUS

else
        echo "check_pf_state_table.sh - Nagios Plugin for checking state table"
        echo ""
        echo "Usage:    check_pf_state_table.sh -w <warnlevel> -c <critlevel>"
        exit 3
fi