#!/bin/sh
# -*- sh -*-
#
# Wildcard-plugin to monitor network interfaces. To monitor an
# interface, link if_packets_<interface> to this file. E.g.
#
#    ln -s /usr/share/munin/node/plugins-auto/if_packets_ /etc/munin/node.d/if_packets_eth0
#
# ...will monitor eth0.
#
# To aggregate all network interfaces on the system (except lo0),
# link if_packets_aggregated to this file.
#
# 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=${0##*if_packets_}

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

if [ "$1" = "suggest" ]; then
	if [ -x /sbin/ifconfig ]
	then
		ifconfig -l | sed -Ee 's/[[:<:]](pfsync|faith|pf(log|sync)|lo|plip|carp|enc|fwe)[^ ]*//g' | xargs -n 1 echo
		exit 0
	elif [ -x /usr/bin/netstat ]; then
		netstat -i -b -n | sed -n -e '/^faith/d' -e '/^lo[0-9]/d' -e '/^pf(log|sync)/d' -e '/<Link#[0-9]*>/s/\** .*//p'
		exit 0
	else
		exit 1
	fi
fi

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

	echo "graph_order rpackets opackets"
	echo "graph_title Interface $INTERFACE pps"
	echo 'graph_args --base 1000'
	echo 'graph_vlabel packets per ${graph_period} in (-) / out (+)'
	echo 'graph_category network'
	echo "graph_info This graph shows the packets counter of the $INTERFACE network interface. Please note that the traffic is shown in packets per second."
	echo 'rpackets.label received'
	echo 'rpackets.type COUNTER'
	echo 'rpackets.graph no'

	echo 'rpackets.min 0'
	echo 'opackets.label pps'
	echo 'opackets.type COUNTER'
	echo 'opackets.negative rpackets'

	echo 'opackets.min 0'
	echo "opackets.info Packets sent (+) and received (-) on the $INTERFACE network interface."
	exit 0
fi

if [ "$INTERFACE" = "aggregated" ]; then
	/usr/bin/netstat -i -b -n | grep -v '^lo' | awk '
BEGIN { rsum = 0; osum = 0; }
/<Link#[0-9]*>/ {
	if (NF == 10) {
		rsum += $4; osum += $7;
	} else if (NF == 11) {
		if ($4 ~ /:/) {
			rsum += $5; osum += $8;
		} else {
			rsum += $4; osum += $8;
		}
	} else { # NF == 12
		rsum += $6; osum += $9;
	}
}
END {
	printf "rpackets.value %i\n", rsum;
	printf "opackets.value %i\n", osum;
}'

else
	/usr/bin/netstat -i -b -n -I $INTERFACE | awk '
/<Link#[0-9]*>/ {
	if (NF == 10) {
		print "rpackets.value", $4;
		print "opackets.value", $7;
	} else if (NF == 11) {
		if ($4 ~ /:/) {
			print "rpackets.value", $5;
			print "opackets.value", $8;
		} else {
			print "rpackets.value", $4;
			print "opackets.value", $8;
		}
	} else { # NF == 12
		print "rpackets.value", $5;
		print "opackets.value", $9;
	}
}'
fi

