#!/usr/bin/perl
# -*- perl -*-
#
# andrew ryder - atr@mrcoffee.org
# motorola surfboard cablemodems (4100 + 4200 from what I know - most likely
# more since Motorola uses many of the same settings/chipsets across cablemodems
# 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 modems ip, generally
# 192.168.100.1 and grabs a html file and parses it. I use this to 
# see how good my cable connection. good if you have choices in your area 
# requires lwp::perl package.
#
#%# family=contrib

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_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";
}