#!/bin/bash

# Exit-Codes:
# 0 = $STATE_OK
# 1 = $STATE_WARNING
# 2 = $STATE_CRITICAL
# 3 = $STATE_UNKNOWN


if [[ -z $1 ]] ; then
	echo "Usage: $0 <netdev>"
	exit 3
fi

DEV=$1
RET=0

if [[ -d /sys/class/net/$DEV ]] ; then
	LINKING=`cat /sys/class/net/$DEV/operstate`
	if [[ "$LINKING" == "up" ]] ; then
		echo -n " $DEV up"
		SPEED=`cat /sys/class/net/$DEV/speed`
		if [[ -n $SPEED ]] ; then
			echo -n " $SPEED"
		fi
	else
		echo -n " $DEV down"
		[[ $RET -lt 2 ]] && RET=2
	fi
else
	echo -n "$DEV Not found in sysfs"
	RET=2
fi

echo
exit $RET