#!/bin/sh
###############################################
#
# Nagios script to check network I/O status
#
# See usage for command line switches
# 
# NOTE: Because of the method of gathering information, bytes/s values are calculated here, so no wanring/critical values can be set to trigger. 
#       Consequently, this check plugin always returns OK.
#       This plugin is a means of returning stats to nagios for graphing (recommend DERIVE graph in RRD)
#
# Created: 2007-09-06 (i.yates@uea.ac.uk)
# Updated: 2007-09-06 (i.yates@uea.ac.uk)
#
###############################################

. /usr/local/nagios/libexec/utils.sh


VERSION="1.0"

IFCONFIG=/sbin/ifconfig
GREP=/bin/grep
CUT=/bin/cut

FLAG_VERBOSE=FALSE
INTERFACE=""
LEVEL_WARN="0"
LEVEL_CRIT="0"
RESULT=""
EXIT_STATUS=$STATE_OK



###############################################
#
## FUNCTIONS 
#

## Print usage
usage() {
	echo " check_netio $VERSION - Nagios network I/O check script"
	echo ""
	echo " Usage: check_netio {-i} [ -v ] [ -h ]"
	echo ""
	echo "		 -i  Interface to check (e.g. eth0)"
	echo "		 -v  Verbose output (ignored for now)"
	echo "		 -h  Show this page"
	echo ""
}
 
## Process command line options
doopts() {
	if ( `test 0 -lt $#` )
	then
		while getopts i:vh myarg "$@"
		do
			case $myarg in
				h|\?)
					usage
					exit;;
				i)
					INTERFACE=$OPTARG;;
				v)
					FLAG_VERBOSE=TRUE;;
				*)	# Default
					usage
					exit;;
			esac
		done
	else
		usage
		exit
	fi
}


# Write output and return result
theend() {
	echo $RESULT
	exit $EXIT_STATUS
}


#
## END FUNCTIONS 
#

#############################################
#
## MAIN 
#


# Handle command line options
doopts $@

# Do the do

BYTES_RX=`$IFCONFIG $INTERFACE | $GREP 'bytes' | $CUT -d":" -f2 | $CUT -d" " -f1`
BYTES_TX=`$IFCONFIG $INTERFACE | $GREP 'bytes' | $CUT -d":" -f3 | $CUT -d" " -f1`

RESULT="NETIO OK - $INTERFACE: RX=$BYTES_RX, TX=$BYTES_TX"

# Quit and return information and exit status
theend