#!/usr/bin/bash
# -*- sh -*-

: << =cut

=head1 NAME

if_ - Wildcard plugin to monitor traffic network interfaces

=head1 CONFIGURATION

=head2 ENVIRONMENT VARIABLES

This plugin does not use environment variables

=head2 WILDCARD PLUGIN

This is a wildcard plugin. To monitor an interface, link
if_<interface> to this file. E.g.

  ln -s /usr/share/munin/plugins/if_ \
        /etc/munin/node.d/if_eth0

...will monitor eth0.

Any device found in /usr/bin/kstat can be monitored.

=head1 AUTHOR

Unknown author

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf suggest

=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

INTERFACE=${0##*/if_}

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

if [ "$1" = "suggest" ]; then
	if [ -x /usr/bin/kstat ]; then
		kstat -p -s rbytes64 | awk -F: '{ print $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 'rbytes.label received'
	echo 'rbytes.type DERIVE'
	echo 'rbytes.graph no'
	echo 'rbytes.cdef rbytes,8,*'
	echo 'rbytes.min 0'
	print_warning rbytes
	print_critical rbytes
	echo 'obytes.label bps'
	echo 'obytes.type DERIVE'
	echo 'obytes.negative rbytes'
	echo 'obytes.cdef obytes,8,*'
	echo 'obytes.min 0'
	print_warning obytes
	print_critical obytes
	exit 0
fi

kstat -C -c net -n $INTERFACE -s rbytes64 | sed 's/.*\(.bytes\)64./\1.value /'
kstat -C -c net -n $INTERFACE -s obytes64 | sed 's/.*\(.bytes\)64./\1.value /'