#!/bin/sh
#
# Wildcard-plugin to monitor network interfaces. To monitor an
# interface, link if_<interface> to this file. E.g.
#
#    ln -s /usr/local/libexec/munin/plugins/if_errcoll_ /etc/munin/plugins/if_errcoll_eth0
#
# ...will monitor eth0.
#
# Any device found in /usr/bin/netstat can be monitored.
#
# Magic markers (optional - used by munin-config and some installation
# scripts):
#
#%# family=auto
#%# capabilities=autoconf suggest


INTERFACE=`basename $0 | sed 's/^if_errcoll_//g'`

if [ "$1" = "autoconf" ]; then
	if [ -x /usr/bin/netstat ]; then
		echo yes
		exit 0
	else
		echo "no (/usr/bin/netstat not found)"
		exit 1
	fi
fi

if [ "$1" = "suggest" ]; then
	if [ -x /usr/bin/netstat ]; then
		netstat -i -b -n | sed -n -e '/^faith/d' -e '/^lo[0-9]/d' -e '/^pflog/d' -e '/<Link>/s/\** .*//p'
		exit 0
	else
		exit 1
	fi
fi

if [ "$1" = "config" ]; then
	echo "graph_order ierrors oerrors collisions"
	echo "graph_title $INTERFACE Errors & Collisions"
	echo 'graph_args --base 1000'
	echo 'graph_vlabel events / ${graph_period}'
	echo 'graph_category network'
	echo "graph_info This graph shows the amount of errors and collisions on the $INTERFACE network interface."
	echo 'ierrors.label Input Errors'
        echo 'ierrors.type COUNTER'
        echo 'oerrors.label Output Errors'
	echo 'oerrors.type COUNTER'
        echo 'collisions.label Collisions'
	echo 'collisions.type COUNTER'
	exit 0
fi;

/usr/bin/netstat -i -n -I $INTERFACE | awk '
/<Link>/ {
	if (NF == 8) {
		print "ierrors.value", $5;
		print "oerrors.value", $7;
		print "collisions.value", $8;
	} else {
		print "ierrors.value", $6;
		print "oerrors.value", $8;
		print "collisions.value", $9;
	}
}'
