#!/bin/bash
#
# check_swap_sl.sh
#
# Program: Used swap check plugin for Nagios
# License : GPL
# Copyright (c) 2004 Timo Dotzauer (tdotzauer@online.de)
#
# check_swap_sl.sh Version 1.0 2004/08/18 
#
# Description :
#
# This plugin is for check the TotalSwap, CachedSwap and FreeSwap
#
# Usage:
# check_swap_sl -w | --warning <INTEGER> -c | --critical <INTEGER>
# check_swap_sl -h | --help for detailed help
# check_swap_sl -v | --version for version information
# 
# Example:
#
# check_swap_sl -w 131072 -c 225280  
#	This will set warning status if the swap used 128 MB or more and will set cirtical 
#	status if the swap used 220 MB or more.  	
# 
# BUGS : Nothing - at this time ;-)



export st=`cat /proc/meminfo |grep SwapTotal`
export sf=`cat /proc/meminfo |grep SwapFree`
export sc=`cat /proc/meminfo |grep SwapCached`
export sc1=`echo $sc |awk '{print $2}'`
export sf1=`echo $sf |awk '{print $2}'`
export st1=`echo $st |awk '{print $2}'`
if [ -z "$1" ] ; then
echo "Usage:"
echo "check_swap_sl -w | --warning <INTEGER> -c | --critical <INTEGER>"
echo "check_swap_sl -h | --help for detailed help"
echo "check_swap_sl -v | --version for version information"
exit 3
fi
case "$1" in 
	-h|--help)
        echo "This plugin will check the used swap space."
        echo ""
        echo "Required Arguments:"
        echo " -w, --warning INTEGER"
        echo "    Exit with WARNING status if less than INTEGER (kbyte) of swap space are free"
        echo " -c, --critical INTEGER"
        echo "    Exit with CRITICAL status if less than INTEGER (kbyte) of swap space are free"
        echo " -h, --help"
        echo "    Print detailed help screen"
        echo " -v, --version INTEGER.INTEGER or INTERGER:INTEGER:INTEGER"
        echo "    Print version information"
	echo "Warning: Threshold must be INTEGER (kbyte)"
	echo ""
	echo "Usage:"
	echo "check_swap_sl -w | --warning <INTEGER> -c | --critical <INTEGER>"
	echo "check_swap_sl -h | --help for detailed help"
	echo "check_swap_sl -v | --version for version information"
	;;
	-v|--version)
	echo "The nagios plugins come with ABSOLUTELY NO WARRANTY. You may redistribute, "
	echo "copies of the plugins under the terms of the GNU General Public License. "
	echo "This Version was only tested under SuSE Linux." 
	;;
	-w|--warning)
	if [ "$1" = "-w" ] | [ "$1" = "--warning" ] & [ -z "$2" ] ; then 
		echo "Warning: Threshold must be INTEGER (kbyte)"
		echo ""
		echo "Usage:"
		echo "check_swap_sl -w | --warning <INTEGER> -c | --critical <INTEGER>"
		echo "check_swap_sl -h | --help for detailed help"
		echo "check_swap_sl -v | --version for version information"
		exit 3
	fi
	;;
	-c|--critical)
	if [ "$3" = "-c" ] | [ "$3" = "--critical" ] & [ -z "$4" ] ; then 
		echo "Warning: Threshold must be INTEGER (kbyte)"
		echo ""
		echo "Usage:"
		echo "check_swap_sl -w | --warning <INTEGER> -c | --critical <INTEGER>"
		echo "check_swap_sl -h | --help for detailed help"
		echo "check_swap_sl -v | --version for version information"
		exit 3
	fi
	;;
	*)
		if [ "$1"x != "x" ] ; then 
		echo "Unknown argument. Usage check_swap_sl -h for detailed information."
		exit 3
		fi
	;;
esac
if [ "$2" = "-c" ] ; then
	echo "Unknown warning value: $2."
	exit 3
fi
if [ -z $4 ] ; then
	echo "Unknown critical value: $4."
	exit 3
fi
if [ "$st1" -le "$2" ] ; then
	echo "ERROR: Warning value can not higher than Total Swap."
	exit 3
fi
if [ "$st1" -le "$4" ] ; then
	echo "ERROR: Critical value can not higher than Total Swap."
	exit 3
fi
if [ $sc1 -ge $2 ] ; then
	echo "SWAP WARNING: Total: $st1  Cached: $sc1  Free: $sf1 "
	exit 2
fi 
if [ -z $4 ] ; then
	echo "Unknown critical value: $4."
	exit 3
fi

if [ $2 -ge $4 ] ; then
	echo "ERROR: Warning value can not lower or equal than critical value"
	exit 3
fi
if [ $sc1 -ge $2 ] ; then
	echo "SWAP CRITICAL: Total: $st1  Cached: $sc1  Free: $sf1 "
	exit 2
fi
echo "SWAP OK: Total: $st1  Cached: $sc1  Free: $sf1 "
exit 0