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#!/bin/sh
###############################################
#
# Nagios script to check Exim mail queue status
#
# Copyright 2007, 2008 Ian Yates
#
# NOTE: Depending on your config, the nagios user will probably be 
#       needed to be added to the exim group for this script to function correctly
# 
# See usage for command line switches
# 
# You need to add the following to /etc/sudoers:
# nagios  ALL=NOPASSWD:/usr/local/exim/bin/exim
#
# Created: 2006-07-31 (i.yates@uea.ac.uk)
# Updated: 2007-04-30 (i.yates@uea.ac.uk) - Linux/sudo tweaks
# Updated: 2008-03-26 (i.yates@uea.ac.uk) - Fixed bug in critical/warning level checking which could result in erroneous results.
# Updated: 2008-11-27 (i.yates@uea.ac.uk) - Added GPLv3 licence
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
# 
###############################################

. /usr/lib64/nagios/plugins/utils.sh


VERSION="1.3"

EXIM=/usr/sbin/exim
SUDO=/usr/bin/sudo

FLAG_VERBOSE=FALSE
LEVEL_WARN=""
LEVEL_CRIT=""
RESULT=""
EXIT_STATUS=$STATE_OK


###############################################
#
## FUNCTIONS 
#

## Print usage
usage() {
	echo " check_eximq $VERSION - Nagios Exim mail queue check script"
	echo ""
	echo " Usage: check_eximq -w <warning queue size> -c <critical queue size> [ -v ] [ -h ]"
	echo ""
	echo "		 -w  Queue size at which a warning is triggered"
	echo "		 -c  Queue size at which a critical is triggered"
	echo "		 -v  Verbose output (ignored for now)"
	echo "		 -h  Show this page"
	echo ""
}
 
## Process command line options
doopts() {
	if ( `test 0 -lt $#` )
	then
		while getopts w:c:vh myarg "$@"
		do
			case $myarg in
				h|\?)
					usage
					exit;;
				w)
					LEVEL_WARN=$OPTARG;;
				c)
					LEVEL_CRIT=$OPTARG;;
				v)
					FLAG_VERBOSE=TRUE;;
				*)	# Default
					usage
					exit;;
			esac
		done
	else
		usage
		exit
	fi
}


# Write output and return result
theend() {
	echo $RESULT
	exit $EXIT_STATUS
}


#
## END FUNCTIONS 
#

#############################################
#
## MAIN 
#


# Handle command line options
doopts $@

# Do the do
OUTPUT=`$SUDO $EXIM -bpc`
if test -z "$OUTPUT" ; then
	RESULT="WARNING - query returned no output!"
	EXIT_STATUS=$STATE_WARNING
else
	if test "$OUTPUT" -lt "$LEVEL_WARN" ; then
		RESULT="OK - $OUTPUT messages in the queue"
		EXIT_STATUS=$STATE_OK
	else
		if test "$OUTPUT" -ge "$LEVEL_CRIT" ; then 
			RESULT="CRITICAL - $OUTPUT messages in the queue"
			EXIT_STATUS=$STATE_CRITICAL
		else
			if test "$OUTPUT" -ge "$LEVEL_WARN" ; then 
				RESULT="WARNING - $OUTPUT messages in the queue"
				EXIT_STATUS=$STATE_WARNING
			fi
		fi
	fi
fi

# Quit and return information and exit status
theend