#!/bin/bash

#################################################################
# Creation: Edouard Lamoine
# Last Modification: 18 mai 2015
# This script is checking the localhost postfix queue
#
# WARNING: This plugin won't work properly if Postfix is not running.
#
# USAGE: ./check_postqueue -w WARNING_NUMBER -c CRITICAL_NUMBER
#
# ex: ./check_postqueue -w 5000 -c 10000
#
#################################################################

#Memo for Nagios outputs
#STATE_OK=0
#STATE_WARNING=1
#STATE_CRITICAL=2
#STATE_UNKNOWN=3

while getopts w:c: option
do
case "${option}"
in
w) WARNING=${OPTARG};;
c) CRITICAL=${OPTARG};;
esac
done


if ! ps aux | grep "postfix"|grep -v grep > /dev/null; then
echo "Postfix service is not running, please start Postfix."
exit 3
fi


if [[ ! $WARNING || ! $CRITICAL ]]; then
echo "Error: please specify warning and critical thresholds. ex: ./check_postqueue -w 5000 -c 10000"
exit 3
fi

if [ $WARNING -gt $CRITICAL ]; then
echo "Error: Warning number is greater than Critical number. Please set your input correctly. ex: ./check_postqueue -w 5000 -c 10000"
exit 3
fi

QUEUE=$((postqueue -p | tail -n 1 | cut -d' ' -f5) 2>&- )
QUEUE=${QUEUE//[!0-9]}

if [[ ! $QUEUE ]]; then
QUEUE=0
fi

if [ $QUEUE -gt $CRITICAL ]; then
echo "CRITICAL - $QUEUE mails in Postfix queue"
exit 2
fi

if [ $QUEUE -gt $WARNING ]; then
echo "WARNING - $QUEUE mails in Postfix queue"
exit 1
fi

echo "OK - $QUEUE mails in queue."
exit 0