#!/bin/sh
#
# Wildcard-plugin to monitor FreeBSD em(4) and igb(4) network interfaces
# using sysctl dev.em.0.mac_stats 64-bit counters
# To monitor an # interface, link ifem_<interface> to this file. E.g.
#
#    ln -s /usr/share/munin/node/plugins-auto/ifem_ /etc/munin/node.d/ifem_em0
#
# ...will monitor em0.
#
# Magic markers (optional - used by munin-config and some installation
# scripts):
#
#%# family=auto
#%# capabilities=autoconf suggest


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

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

if [ "$1" = "suggest" ]; then
	if [ -x /sbin/sysctl ]; then
		/sbin/sysctl -q dev.em dev.igb | /usr/bin/awk -F '.' '/mac_stats\.total_pkts_recvd/{print $2$3;}'
		exit 0
	else
		exit 1
	fi
fi

if [ "$1" = "config" ]; then

	echo "graph_order rbytes obytes"
	echo "graph_title $INTERFACE traffic"
	echo 'graph_args --base 1000'
	echo 'graph_vlabel bits per ${graph_period} in (-) / out (+)'
	echo 'graph_category network'
	echo "graph_info This graph shows the traffic of the $INTERFACE network interface. Please note that the traffic is shown in bits per second, not bytes."
	echo 'rbytes.label received'
        echo 'rbytes.type COUNTER'
        echo 'rbytes.graph no'
        echo 'rbytes.cdef rbytes,8,*'
        echo 'obytes.label bps'
	echo 'obytes.type COUNTER'
	echo 'obytes.negative rbytes'
	echo 'obytes.cdef obytes,8,*'
	echo "obytes.info Traffic sent (+) and received (-) on the $INTERFACE network interface."
	exit 0
fi

oid=`echo $INTERFACE | sed -E 's/^(em|igb)([0-9]+)$/dev\.\1\.\2\.mac_stats/g'`
rbytes='U'
obytes='U'

while read ev val; do
   case "$ev" in
	"$oid.good_octets_recvd:")
	   rbytes="$val"
	   ;;
        "$oid.good_octets_txd:")
	   obytes="$val"
	   ;;
        "$oid.good_octest_txd:")
	   obytes="$val"
	   ;;
   esac
done << EOF
$(/sbin/sysctl -q $oid 2>/dev/null)
EOF

printf "rbytes.value ${rbytes}\nobytes.value ${obytes}\n"