Munin contributed plugins

#!/bin/bash

#

# Show noise and signal levels of wifi enabled devices.

# Author: Nicolai Langfeldt, janl@linprolno

# Modifications: Sebastián Cruz, crux@lugmen.org.ar

# License: GPL v. 2

#

#%# family=auto

#%# capabilities=autoconf

PNWL=/proc/net/wireless

do_fetch () {

    awk -F'[ :]*' '/:/ {

                gsub(/\. /," ",$0); # Remove periods with no decimals after

	        print $2"_noise.value "$6;

	        print $2"_signal.value "$5;

	}' $PNWL

}

do_config () {

    echo "graph_title WiFi signal and noise"

    echo "graph_args --base 1000 -u 0"

    echo "graph_vlabel dB"

    echo "graph_category network"

    echo "graph_info This graph shows the noise and singal levels of your WiFi devices"

    awk -F'[ :]*' '/:/ {

	        print $2"_noise.label Noise "$2;

	        print $2"_signal.label Signal "$2;

	}' $PNWL

}

do_autoconf () {

    if [ ! -f $PNWL ] ; then

	echo "no (no $PNWL)"

	exit 1

    fi

    if [ ! -r $PNWL ] ; then

	echo "no (could not read $PNWL)"

	exit 1

    fi

    if grep -qs : $PNWL ; then

	echo yes

	exit 0

    fi

    echo "no (no devices in $PNWL)"

    exit 1

}

case $1 in

    config|autoconf)

        eval do_$1

	exit 0;;

    '')

        do_fetch

	exit 0;;

esac