check_snmp_qnap_volumes

#!/bin/bash
#
#    Program : check_snmp_qnap_disks
#            :
#     Author : Jason Rivers <jason@jasonrivers.co.uk>
#            :
#    Purpose : Nagios plugin to return Information about Disks in a QNAP NAS
#            :
# Parameters : --help
#            : --version
#            :
#    Returns : Standard Nagios status_* codes
#            :
#    Licence : GPL
#
#      Notes : See --help for details
#============:==============================================================

#set -x

STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

EXITCODE=$STATE_UNKNOWN

OID_NUMBER_OF_VOLUMES=".1.3.6.1.4.1.24681.1.2.16.0"

OID_MODEL_NUMBER=".1.3.6.1.4.1.24681.1.2.12"
OID_VOLUMES=".1.3.6.1.4.1.24681.1.2.17"
OID_VOLUMES_SIZE=".1.3.6.1.4.1.24681.1.2.17.1.4"
OID_VOLUMES_FREE=".1.3.6.1.4.1.24681.1.2.17.1.5"
OID_VOLUMES_NAME=".1.3.6.1.4.1.24681.1.2.17.1.2"

SNMPWALK=/usr/bin/snmpwalk
SNMPGET=/usr/bin/snmpget
SNMP_COMMUNITY="public"
SNMP_VERSION="2c"
WARNING=20
CRITICAL=10

while getopts H:v:C:w:c:hV:D OPT
do
  case "$OPT" in
    H) REMOTE_HOSTNAME="$OPTARG" ;;
    v) SNMP_VERSION="$OPTARG" ;;
    C) SNMP_COMMUNITY="$OPTARG" ;;
    w) WARNING=$OPTARG ;;
    c) CRITICAL=$OPTARG ;;
    h) print_help
       exit "$STATE_UNKNOWN" ;;
    V) print_version
       exit "$STATE_UNKNOWN";;
    D) DEBUG=true ;;
   esac
done



TOTAL_VOLUMES=`$SNMPWALK -c $SNMP_COMMUNITY -v $SNMP_VERSION $REMOTE_HOSTNAME $OID_NUMBER_OF_VOLUMES -Oav | sed 's/INTEGER: //'`
VOLUME=1

if [ "$DEBUG" ]; then
	echo "DEBUG: TOTAL_VOLUMES: $TOTAL_VOLUMES"
fi

SizeInMB () {

	SIZE=$1
	COMP=$2

	case $COMP in 
		"TB")
			SIZE=$(echo "${SIZE} *1024 * 1024" | bc )
			;;
		"GB")
			SIZE=$(echo "${SIZE} * 1024" | bc)
			;;
	esac

	echo $SIZE
}

while [ ${VOLUME} -le ${TOTAL_VOLUMES} ]; do
	VOLUME_NAME=`$SNMPWALK -c $SNMP_COMMUNITY -v $SNMP_VERSION $REMOTE_HOSTNAME ${OID_VOLUMES_NAME}.${VOLUME} -Oav | sed 's/STRING: "\[//;s/\]"//;s/,//' | awk '{print $2}'`
	VOLUME_SIZE=`$SNMPWALK -c $SNMP_COMMUNITY -v $SNMP_VERSION $REMOTE_HOSTNAME ${OID_VOLUMES_SIZE}.${VOLUME} -Oav | sed 's/STRING: "//;s/"//'`
	VOLUME_FREE=`$SNMPWALK -c $SNMP_COMMUNITY -v $SNMP_VERSION $REMOTE_HOSTNAME ${OID_VOLUMES_FREE}.${VOLUME} -Oav | sed 's/STRING: "//;s/"//'`

	## ignore dumb volumes
	if ! [ "${VOLUME_SIZE}" = "0.00 KB" ]; then
		SIZE_COMP=$(echo ${VOLUME_SIZE} | awk '{print $NF}')
		FREE_COMP=$(echo ${VOLUME_FREE} | awk '{print $NF}')
		VOLUME_SIZE_COMP=$(echo $VOLUME_SIZE | awk '{print $1}')
		VOLUME_FREE_COMP=$(echo $VOLUME_FREE | awk '{print $1}')

		VOLUME_SIZE=$(SizeInMB ${VOLUME_SIZE_COMP} ${SIZE_COMP})
		VOLUME_FREE=$(SizeInMB ${VOLUME_FREE_COMP} ${FREE_COMP})
		VOLUME_USED=$(echo "$VOLUME_SIZE - $VOLUME_FREE" | bc)

		VOLUME_PERCENT_USED=$(awk "BEGIN { pc=100*${VOLUME_USED}/${VOLUME_SIZE}; i=int(pc); print (pc-i<0.5)?i:i+1 }")
		VOLUME_PERCENT_FREE=$(awk "BEGIN { pc=100*${VOLUME_FREE}/${VOLUME_SIZE}; i=int(pc); print (pc-i<0.5)?i:i+1 }")
		if ! [ "$EXITCODE" = "$STATE_CRITICAL" ]; then
			if [ $VOLUME_PERCENT_FREE -le $WARNING ]; then
				EXITCODE=$STATE_WARNING
			fi
			if [ $VOLUME_PERCENT_FREE -le $CRITICAL ]; then
				EXITCODE=$STATE_CRITICAL
			fi
		fi

		
		if [ "$DEBUG" ]; then

			echo "DEBUG: VOLUME_NAME: ${VOLUME_NAME}"
			echo "DEBUG: VOLUME_SIZE: ${VOLUME_SIZE}"
			echo "DEBUG: VOLUME_FREE: ${VOLUME_FREE}"
			echo "DEBUG: VOLUME_USED: ${VOLUME_USED}"
			echo "DEBUG: VOLUME_PERCENT_USED: ${VOLUME_PERCENT_USED}"
			echo "DEBUG: VOLUME_PERCENT_FREE: ${VOLUME_PERCENT_FREE}"
		fi

		if [ "$PERFDATA" = "" ]; then
			PERFDATA="${VOLUME_NAME}=${VOLUME_PERCENT_USED};${WARNING};${CRITICAL};0;100"
			MESSAGE="${VOLUME_NAME}=${VOLUME_PERCENT_USED}%";
		else
			PERFDATA="${PERFDATA}, ${VOLUME_NAME}=${VOLUME_PERCENT_USED};${WARNING};${CRITICAL};0;100"
			MESSAGE="${MESSAGE}, ${VOLUME_NAME}=${VOLUME_PERCENT_USED}%";
		fi
	else
		if [ "$DEBUG" ]; then
			echo "DEBUG: IGNORING ${VOLUME_NAME}"
		fi
	fi
	
	let VOLUME=${VOLUME}+1


done

if [ $EXITCODE = $STATE_WARNING ];then
	EXITCODE=$STATE_WARNING
	EXITMSG="WARNING: Volume usage"
elif [ $EXITCODE = $STATE_CRITICAL ];then
	EXITCODE=$STATE_CRITICAL
	EXITMSG="CRITICAL: Volume usage"
else 
	EXITCODE=$STATE_OK
	EXITMSG="OK: Volume usage"
fi

if [ "$DEBUG" ]; then
	echo "DEBUG: PERFDATA: ${PERFDATA}"
	echo "exiting with $EXITCODE"
fi

echo "${EXITMSG} ${MESSAGE} | ${PERFDATA}"
exit $EXITCODE