check_iscsi

#!/bin/bash
# 
# Plugin to check the iscsi status
# I may write an sh compatable version of this if requested. Right now it requires Bash >= v3
# You can find the lastest version of my nagios checks here: https://github.com/hugme/Nag_checks
VERSION="version 1.0.0"
MOD="05-09-2013"
# 
##########################################################

ISCSI_CHECK="/sbin/iscsiadm -m session"

##########################################################
# We call them functions because they're fun
##########################################################

print_help() {
cat << EOF
ISCSI Plugin for Nagios
Version: $VERSION
Last Modified: $MOD

You can use the ip address or the IQN to look for a session. If you have multiple paths your IQN could possibly be the same so it's suggested to use the IP address or assign a different IQN for each path. There is no warning and no need to set a critical, if it's working your OK, if it's not working your critical. You can request a number of sessions from iscsi.

Usage: check_iscsi -i [IP ADDRESS] -q [IQN] (-c [total sessions])

Options:
 -i [IP address]	The IP address of the iscsi server you're checking
 -q [IQN code]		The IQN code of the iscsi path you're checking
 -c [count]		The number of sessions matching your criteria (not required)

EOF
	}

invalid_type() {
	echo "\nInvalid $1\n"
	print_help
	exit 3
	}

##############################################
## Suck in the user input
##############################################


while test -n "$1"; do
	case $1 in
		--help) print_help ; exit 0 ;;
		-h) print_help ; exit 0 ;;
		-i) IP_ADD=$2; shift ;;
		-q) IQN=$2 ;;
		-c) TOTAL=$2 ;;
	esac
	shift
done

[[ -z $TOTAL ]] && TOTAL=1

##############################################
## Check user input
##############################################

[[ -z $IP_ADD && -z $IQN ]] && ERROR="Either an IP Address or an IQN are required"
[[ ${#IP_ADD} -gt 16 ]] && ERROR="The IP address is too long"
[[ ${#IQN} -gt 128 ]] && ERROR="The IQN address is too long - ${#IQN}"

[[ ! -z $ERROR ]] && {
	echo "Syntax error"
	echo $ERROR
	exit 3
	}

##############################################
## Do the work
## check the iscsiadm command
## grab the lines we need
## Print the information
##############################################

COUNT=0
while read _ _ TEST_ADDRESS TEST_IQN _ ; do
	[[ $IP_ADD == ${TEST_ADDRESS%%:*} || $IQN == $TEST_IQN ]] && ((COUNT++))
done< <($ISCSI_CHECK)

[[ $COUNT == $TOTAL ]] && {
	[[ ! -z $IP_ADD ]] && {
	echo "OK - Host is logged into iSCSI IP address $IP_ADD"
	} || {
	echo "OK - Host is logged into $COUNT port on $IQN"
	}
	exit 0
} || {
	echo "CRITICAL - Total sessions are $COUNT and should be $TOTAL for $IP_ADD $IQN"
	exit 2
}