#!/bin/bash
# NFS mount plugin for Nagios
# Written by Tim Gibbon nagios-plugin@chegwin.org
# Last Modified: 29-Sep-2008
#
# Description:
#
# This plugin will check the status of a remote servers NFS shares. Note that
# in the event of nfsd failing and portmap remaining up, showmount will still
# return a list of shares and zero error code. If you are concerned about this
# then do not use this script.
#
# Add the following to /etc/nagios2/conf.d/check_nfsmount.cfg
#define command {
#        command_name check_nfsmount
#        command_line $USER1$/check_nfsmount -H $HOSTADDRESS$
#        }
# Add the following to your main services_nagios2.cfg
#
#define service {
#        hostgroup_name                 	nfs-servers 
#        service_description             NFS
#	check_command                   check_nfsmount
#        use                             generic-service
#	notification_interval           0 ; set > 0 if you want to be renotified
#}
# Add the following to your hostgroups_nagios2.cfg
#define hostgroup {
#	hostgroup_name nfs-servers
#	alias NFS servers
#	members	icybox
#	}





# Location of the showmount command (if not in path)
SHOWMOUNT="/sbin/showmount"


# Don't change anything below here

# Nagios return codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4

if [ ! -x "${SHOWMOUNT}" ]
then
	echo "UNKNOWN: $SHOWMOUNT not found or is not executable by the nagios user"
	exitstatus=$STATE_UNKNOWN
	exit $exitstatus
fi

PROGNAME=`basename $0`

print_usage() {
	echo "Usage: $PROGNAME -H <hostname>"
	echo ""
	echo "Notes:"
	echo "-H: Hostname - Can be a hostname or IP address"
	echo ""
}

print_help() {
	print_usage
	echo ""
	echo "This plugin will check the NFS mounts on a remote (or local with -H localhost) NFS server."
	echo ""
	exit 0
}


#exitstatus=${STATE_UNKNOWN} #default

while test -n "$1"; do
	case "$1" in
		--help)
			print_help
			exit $STATE_OK
			;;
		-h)
			print_help
			exit $STATE_OK
			;;
		-H)
			HOSTNAME=$2
			shift
			;;
		*)
			print_help
			exit $STATE_OK
	esac
	shift
done

# Check arguments for validity
if [ -z ${HOSTNAME} ]
then
	echo "You must specify a hostname (or localhost to test the local system)"
	print_usage
	exitstatus=$STATE_UNKNOWN
	exit $exitstatus
fi

# Run basic showmount and find our status
SHOWMOUNT_OUTPUT=`${SHOWMOUNT} -e ${HOSTNAME} 2>&1`

if [ $? -ne 0 ]
then
exitstatus=${STATE_CRITICAL}
else
exitstatus=${STATE_OK}
fi

# Remove the wildcards as they cause a complete listing of CWD
# Uncomment the following 2 lines if you wish to have a list of shares
# in your Nagios output
#CLEANED_SHOWMOUNT_OUTPUT=`${SHOWMOUNT} -e ${HOSTNAME} 2>&1 | sed -e s/\*//g`
#echo ${CLEANED_SHOWMOUNT_OUTPUT}

exit $exitstatus