#!/bin/sh

: << =cut

=head1 NAME

if_err_ - Wildcard plugin to monitor errors on 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-auto/if_err_ \
        /etc/munin/node.d/if_err_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_err_}

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 ierrors | awk -F: '$1 != "unix" && $3 != "mac" { print $3 }'
		exit 0
	else
		exit 1
	fi
fi

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

	echo "graph_order ierrors oerrors collisions"
	echo "graph_title Interface $INTERFACE errors & collisions"
	echo 'graph_args --base 1000'
	echo 'graph_vlabel events / ${graph_period}'
	echo 'graph_category network'
	echo 'ierrors.label Input Errors'
        echo 'ierrors.type COUNTER'
        echo 'ierrors.max 2000000000'
	print_warning ierrors
	print_critical ierrors
        echo 'oerrors.label Output Errors'
	echo 'oerrors.type COUNTER'
        echo 'oerrors.max 2000000000'
	print_warning oerrors
	print_critical oerrors
        echo 'collisions.label Collisions'
	echo 'collisions.type COUNTER'
        echo 'collisions.max 2000000000'
	print_warning collisions
	print_critical collisions
	exit 0
fi

kstat -p -n $INTERFACE -s '/^([io]errors|collisions)$/' | awk -F: '
$1 != "unix" {
	split($4, four, "\t")
	print four[1] ".value", four[2]
}'
