Munin contributed plugins

#!/usr/bin/env python3

# Copyright 2020 Nathaniel Clark <nathaniel.clark@misrule.us>

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU Library General Public License as published by

# the Free Software Foundation; version 2 only

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU Library General Public License for more details.

#

# You should have received a copy of the GNU Library General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#

"""

=head1 NAME

arris-sb6183 - Health monitoring plugin for Arris SB6183 Cable Modem

=head1 DESCRIPTION

This provides the following multigraphs:

* upstream and downstream power levels

* downstream signal to noise ratio

* downstream error counts

The values are retrieved from the cable modem's status web pages at

192.168.100.1. So, this plugin must be installed on a munin node

which can access those pages.

=head1 CONFIGURATION

Make sure 192.168.100.1 is accessible through your firewall.

To have this register with munin as it's own host set the "env.hostname" in config.

Also ensure that the hostname set is listed in munin.conf.

[arris*]

env.hostname modem

=head1 TESTING

Developed and tested with:

firmware:         D30CM-OSPREY-2.4.0.1-GA-02-NOSH

hardware version: 1

=head1 VERSION

0.0.1

=head1 AUTHOR

Nathaniel Clark <nathaniel.clark@misrule.us>

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=contrib

 #%# capabilities=autoconf

=cut

"""

import re

import os

import sys

from urllib import request

HOSTNAME = os.getenv("hostname", None)

URL = "http://192.168.100.1/RgConnect.asp"

UPCOUNT = 4

DOWNCOUNT = 16

if len(sys.argv) == 2:

    if sys.argv[1] == "config":

        if HOSTNAME:

            print("host_name {0}\n".format(HOSTNAME))

        # POWER

        print("multigraph arris_power")

        print("graph_title Arris Power (dBmV)")

        print("graph_vlabel Power (dBmV)")

        print("graph_category network")

        for i in range(1, DOWNCOUNT + 1):

            print("down_{0}.label Down Ch {1}".format(i, i))

            print("down_{0}.type GAUGE".format(i))

            print("down_{0}.draw LINE1".format(i))

        for i in range(1, UPCOUNT + 1):

            print("up_{0}.label Up Ch {1}".format(i, i))

            print("up_{0}.type GAUGE".format(i))

            print("up_{0}.draw LINE1".format(i))

        for i in range(1, DOWNCOUNT + 1):

            name = "down_{0}".format(i)

            print("\nmultigraph arris_power.{0}".format(name))

            print("graph_title Downstream Power for Channel {0} (dBmV)".format(i))

            print("graph_category network")

            print("power.label dBmV")

            print("power.type GAUGE")

            print("power.draw LINE1")

        for i in range(1, UPCOUNT + 1):

            name = "up_{0}".format(i)

            print("\nmultigraph arris_power.{0}".format(name))

            print("graph_title Upstream Power for Channel {0} (dBmV)".format(i))

            print("graph_category network")

            print("power.label dBmV")

            print("power.type GAUGE")

            print("power.draw LINE1")

        # SNR

        print("\nmultigraph arris_snr")

        print("graph_title Arris Signal-to-Noise Ratio (dB)")

        print("graph_vlabel SNR (dB)")

        print("graph_category network")

        for i in range(1, DOWNCOUNT + 1):

            print("down_{0}.label Ch {1}".format(i, i))

            print("down_{0}.type GAUGE".format(i))

            print("down_{0}.draw LINE1".format(i))

        for i in range(1, DOWNCOUNT + 1):

            name = "down_{0}".format(i)

            print("\nmultigraph arris_snr.{0}".format(name))

            print("graph_title SNR on Channel {0} (dB)".format(i))

            print("graph_vlabel SNR (dB)")

            print("graph_category network")

            print("snr.label dB")

            print("snr.type GAUGE")

            print("snr.draw LINE1")

        # ERRORS

        print("\nmultigraph arris_error")

        print("graph_title Arris Channel Errors")

        print("graph_category network")

        print("graph_args --base 1000")

        print("graph_vlabel errors/sec")

        print("graph_category network")

        print("corr.label Corrected")

        print("corr.type DERIVE")

        print("corr.min 0")

        print("uncr.label Uncorrectable")

        print("uncr.type DERIVE")

        print("uncr.min 0")

        print("uncr.warning 1")

        for i in range(1, DOWNCOUNT + 1):

            name = "down_{0}".format(i)

            print("\nmultigraph arris_error.{0}".format(name))

            print("graph_title Channel {0} Errors".format(i))

            print("graph_args --base 1000")

            print("graph_vlabel errors/sec")

            print("graph_category network")

            print("corr.label Correctable")

            print("corr.type DERIVE")

            print("corr.min 0")

            print("uncr.label Uncorrectable")

            print("uncr.type DERIVE")

            print("uncr.min 0")

            print("uncr.warning 1")

        sys.exit(0)

    if sys.argv[1] == "autoconfig":

        try:

            from lxml import html

            resp = request.urlopen(URL)

        except ImportError:

            print("no (missing lxml module)")

        except OSError:

            print("no (no router)")

        else:

            if resp.status == 200:

                print("yes")

            else:

                print("no (Bad status code: %d)" % page.status_code)

        sys.exit(0)

from lxml import html

rxblank = re.compile(r"[\x00\n\r\t ]+", re.MULTILINE)

rxcomment = re.compile(r"<!--.*?-->")

rxscript = re.compile(r"<script.*?</script>", re.MULTILINE)

resp = request.urlopen(URL)

data = rxscript.sub(

    "",

    rxcomment.sub(

        "",

        rxblank.sub(" ", "".join(map(lambda x: x.decode("utf-8"), resp.readlines()))),

    ),

)

dom = html.fromstring(data)

arr = dom.xpath('//table[contains(@class, "simpleTable")]')

downstream = arr[1]

upstream = arr[2]

trs = downstream.findall("tr")

# drop title

trs.pop(0)

headings = ["".join(x.itertext()).strip() for x in trs.pop(0).findall("td")]

# ['Channel', 'Lock Status', 'Modulation', 'Channel ID', 'Frequency', 'Power', 'SNR', 'Corrected', 'Uncorrectables']

# Summation Graphs

correct = 0

uncorr = 0

power = {"up": ["U"] * UPCOUNT, "down": ["U"] * DOWNCOUNT}

snr = ["U"] * DOWNCOUNT

for row in trs:

    data = dict(

        zip(headings, ["".join(x.itertext()).strip() for x in row.findall("td")])

    )

    uncorr += int(data["Uncorrectables"])

    correct += int(data["Corrected"])

    channel = int(data["Channel"])

    print("multigraph arris_power.down_{0}".format(channel))

    value = data["Power"].split(" ")[0]

    print("power.value {0}".format(value))

    power["down"][channel - 1] = value

    print("multigraph arris_snr.down_{0}".format(channel))

    value = data["SNR"].split(" ")[0]

    print("snr.value {0}".format(value))

    snr[channel - 1] = value

    print("multigraph arris_error.down_{0}".format(channel))

    print("corr.value {0}".format(data["Corrected"]))

    print("uncr.value {0}".format(data["Uncorrectables"]))

# Fill missing

for i in range(len(trs), DOWNCOUNT):

    print("multigraph arris_power.down_{0}".format(i + 1))

    print("power.value U")

    print("multigraph arris_snr.down_{0}".format(i + 1))

    print("snr.value U")

    print("multigraph arris_error.down_{0}".format(i + 1))

    print("corr.value U")

    print("uncr.value U")

print("multigraph arris_error")

print("corr.value {0}".format(correct))

print("uncr.value {0}".format(uncorr))

print("multigraph arris_snr")

for i in range(0, DOWNCOUNT):

    print("down_{0}.value {1}".format(i + 1, snr[i]))

trs = upstream.findall("tr")

# drop title

trs.pop(0)

headings = ["".join(x.itertext()).strip() for x in trs.pop(0).findall("td")]

# ['Channel', 'Lock Status', 'US Channel Type', 'Channel ID', 'Symbol Rate', 'Frequency', 'Power']

for row in trs:

    data = dict(

        zip(headings, ["".join(x.itertext()).strip() for x in row.findall("td")])

    )

    channel = int(data["Channel"])

    print("multigraph arris_power.up_{0}".format(channel))

    value = data["Power"].split(" ")[0]

    print("power.value {0}".format(value))

    power["up"][channel - 1] = value

# Fill missing

for i in range(len(trs), UPCOUNT):

    print("multigraph arris_power.up_{0}".format(i + 1))

    print("power.value U")

print("multigraph arris_power")

for i in range(0, DOWNCOUNT):

    print("down_{0}.value {1}".format(i + 1, power["down"][i]))

for i in range(0, UPCOUNT):

    print("up_{0}.value {1}".format(i + 1, power["up"][i]))