#!/usr/bin/perl
# -*- perl -*-

=head1 NAME

surfboard - Plugin to monitor surfboard cable modems

=head1 CONFIGURATION

No configuration

=head1 NOTES

This plugin monitors Motorola Surfboard cable modems, models 4100 and
4200. Most likely more models are compatible since Motorola uses many
of the same settings/chipsets across cable modems.

I know this will not work on Toshiba ones since they use a different
url and page.

This is real simple: it goes to your cable modem's IP address,
generally 192.168.100.1, grabs a HTML file, and parses it.

I use this to see how good my cable connection is. Good if you have
choices in your area.

Requires libwww-perl.

=head1 AUTHOR

Andrew Ryder <atr@mrcoffee.org>

=head1 LICENSE

GPLv2

=head1 BUGS

Needs work, some variables used in the plugin should be made into
configuration environment variables.

=head1 MAGIC MARKERS

 #%# family=contrib

=cut

use LWP::Simple;
use strict;

my $sb4200_url = "http://192.168.100.1/signaldata.html";
my $url = get($sb4200_url);
my $chunk = undef;
my $snr = undef;
my $powerleveld = undef;
my $powerlevelu = undef;

if ($ARGV[0] and $ARGV[0] eq "config") {
    print "graph_title Surfboard Statistics\n";
    print "graph_category network\n";
    print "graph_order snr downstream upstream\n";
    print "graph_vlabel surfboard statistics\n";
    print "snr.label SnR dB\n";
    print "snr.draw LINE\n";
    print "downstream.label Power down dBmV\n";
    print "downstream.draw LINE\n";
    print "upstream.label Power up dBmV\n";
    print "upstream.draw LINE\n";

    exit 0;
}

while ($url =~ m{>Downstream(.*?)line\.gif}gs) {
    $chunk = $1;
    $chunk =~ s/\n//gs;
    ($snr,$powerleveld,$powerlevelu) =
        $chunk =~ m{Ratio<\/TD><TD>(.*?)\sdB.*?Power\sLevel<\/TD><TD>(.*?)dBmV.*Power\sLevel<\/TD><TD>(.*?)dBmV}i
        or next;

    # Munin up to 1.2.5/1.3.3 is intolerant of trailing space in values
    $snr =~ s/\s+$//;
    $powerleveld =~ s/\s+$//;
    $powerlevelu =~ s/\s+$//;

    print "snr.value $snr\n";
    print "downstream.value $powerleveld\n";
    print "upstream.value $powerlevelu\n";
}