#!/bin/bash

SURILOG=$(tac /var/log/suricata/stats.log | grep kernel | head -4)
declare RESULT=($SURILOG)

CURRENTDROP=${RESULT[4]}
PASTDROP=${RESULT[14]}
DROPPED=$(($CURRENTDROP - $PASTDROP))

CURRENTPACKETS=${RESULT[9]}
PASTPACKETS=${RESULT[19]}
TOTAL=$(($CURRENTPACKETS - $PASTPACKETS))

LOSS=$(echo $DROPPED $TOTAL / p | dc)
echo "suridrop drop=$LOSS"