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#!/bin/sh

# Check CARP status on BSD machines

# - Works with either no parameter on standard configurations (slave has an advskew > 0)

# - Possible to override expected state definition with -M/-B flags

#

# Author : Stephane LAPIE <stephane.lapie@asahinet.com>

cd `dirname $0`

DIR=`pwd`

SCRIPT=`basename $0`

usage()

{

	echo "Usage: $0 [-h] [-B|-M] [NIC]"

	echo "	-B : Expects the NICs to be in BACKUP mode"

	echo "	-M : Expects the NICs to be in MASTER mode"

	echo "	If no NICs are specified, all currently CARP enabled ones will be checked"

	exit 3

}

exit_nagios()

{

	case $1 in

		0)

			echo "OK - $2"

			;;

		1)

			echo "WARNING - $2"

			;;

		2)

			echo "CRITICAL - $2"

			;;

		*)

			echo "UNKNOWN - $2"

			;;

	esac

}

###############################################################################

# Check OS

OS=`uname -s`

if ! (echo "$OS" | grep -E "FreeBSD|OpenBSD" >/dev/null) ; then

	echo "UNKNOWN - OS '$OS' not supported by this script"

	exit 3

fi

###############################################################################

# Check if CARP is used

CARP_OUTPUT=`ifconfig | grep "carp:"`

if [ -z "$CARP_OUTPUT" ] ; then

	exit_nagios 3 "No NIC is CARP enabled"

fi

###############################################################################

# Parse arguments

OK_MODE=ADVSKEW

NG_MODE=""

GETOPT_TEMP=`getopt MBh "$@"`

eval set -- "$GETOPT_TEMP"

while true ; do

	case "$1" in

		-M)

			OK_MODE=MASTER;

			NG_MODE=BACKUP;

			shift

			;;

		-B)

			OK_MODE=BACKUP;

			NG_MODE=MASTER;

			shift

			;;

		-h)

			usage

			;;

		--) shift ; break ;;

		*) echo "Internal error!"; exit 3 ;;

	esac

done

###############################################################################

# Check NIC list

NIC_LIST=`ifconfig -l`

NICS="$@"

# If no NIC was specified only keep the CARP enabled ones

if [ -z "$NICS" ] ; then

	for nic in $NIC_LIST ; do

		if (ifconfig $nic | grep "carp:" >/dev/null) ; then

			NICS="$NICS $nic"

		fi

	done

fi

return_code=0 # Default to OK

return_msg="CARP Status :"

# Check status of each CARP enabled NIC

for nic in $NICS ; do

	carp_output=`ifconfig $nic | grep "carp:" | tr -d '\t'`

	# carp: MASTER vhid 232 advbase 1 advskew 0

	# carp: BACKUP vhid 232 advbase 1 advskew 100

	carp_status=`echo "$carp_output" | sed 's/^carp: //;s/ .*//'`

	# MASTER

	# BACKUP

	if [ -z "$carp_status" ] ; then # NIC was not CARP enabled ?

		return_msg="${return_msg} ${nic} is not CARP enabled"

		if [ "$return_code" -lt 3 ] ; then return_code=3 ; fi

	else

		carp_advskew=`echo "$carp_output" | sed 's/.* advskew \([0-9][0-9]*\)/\1/'`

		# advskew 0 -> should be MASTER

		# advskew > 0 -> should be BACKUP

		return_msg="${return_msg} ${nic} is ${carp_status}"

		case $OK_MODE in

			MASTER|BACKUP)

				if [ "$carp_status" == "$OK_MODE" ] ; then

					return_msg="${return_msg} (OK)"

				elif [ "$carp_status" == "$NG_MODE" ] ; then

					return_msg="${return_msg} (CRITICAL)"

					if [ "$return_code" -lt 2 ] ; then return_code=2 ; fi

				else

					return_msg="${return_msg} (UNKNOWN)"

					if [ "$return_code" -lt 3 ] ; then return_code=3 ; fi

				fi

				;;

			ADVSKEW)

				if [ "$carp_advskew" -eq 0 ] ; then # advskew > 0, should be BACKUP

					if [ "$carp_status" = "MASTER" ] ; then

						return_msg="${return_msg} (OK)"

					elif [ "$carp_status" = "BACKUP" ] ; then

						return_msg="${return_msg} (CRITICAL)"

						if [ "$return_code" -lt 2 ] ; then return_code=2 ; fi

					else

						return_msg="${return_msg} (UNKNOWN)"

						if [ "$return_code" -lt 3 ] ; then return_code=3 ; fi

					fi

				else

					if [ "$carp_status" = "BACKUP" ] ; then

						return_msg="${return_msg} (OK)"

					elif [ "$carp_status" = "MASTER" ] ; then

						return_msg="${return_msg} (CRITICAL)"

						if [ "$return_code" -lt 2 ] ; then return_code=2 ; fi

					else

						return_msg="${return_msg} (UNKNOWN)"

						if [ "$return_code" -lt 3 ] ; then return_code=3 ; fi

					fi

				fi

				;;

		esac

	fi

	return_msg="${return_msg};"

done

exit_nagios "$return_code" "$return_msg"