#!/usr/bin/python

# modem:
#
# * uptime
#
# 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.
#
# To install, place this plugin in the node's plugins directory,
# /etc/munin/plugins and restart munin-node.
#
# Developed and tested with:
# firmware:         D30CM-OSPREY-2.4.0.1-GA-02-NOSH
# hardware version: 1
#
# Copyright 2020 Nathaniel Clark <nathaniel.clark@misrule.us>

"""
=head1 NAME

arris-sb6183_uptime - Uptime monitoring for Arris SB6183 Cable Modem

=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 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
import requests
from lxml import html


URL = os.getenv("url", "http://192.168.100.1/RgSwInfo.asp")
HOSTNAME = os.getenv("hostname", None)

if len(sys.argv) == 2:
    if sys.argv[1] == "config":
        print("host_name {0}".format(HOSTNAME))

        # POWER
        print(
            """graph_title Modem Uptime
graph_category system
graph_args --base 1000 -l 0
graph_vlabel uptime in days
graph_scale no
graph_category system
graph_info This graph shows the number of days that the the host is up and running so far.
uptime.label uptime
uptime.info The system uptime itself in days.
uptime.draw AREA
"""
        )
        sys.exit(0)

    if sys.argv[1] == "autoconfig":
        try:
            page = requests.get(URL)
        except:
            print("no (no router)")
        else:
            if page.status_code == 200:
                print("yes")
            else:
                print("no (Bad status code: %d)" % page.status_code)
        sys.exit(0)

rxblank = re.compile(r"[\x00\n\r\t ]+", re.MULTILINE)
rxcomment = re.compile(r"<!--.*?-->")
rxscript = re.compile(r"<script.*?</script>", re.MULTILINE)

page = requests.get(URL)
data = rxscript.sub("", rxcomment.sub("", rxblank.sub(" ", page.text)))
dom = html.fromstring(data)

arr = dom.xpath('//table[contains(@class, "simpleTable")]')
trs = arr[1].findall("tr")
# drop title
trs.pop(0)

date = "".join(trs[0].findall("td")[1].itertext()).strip()

arr = date.split(" ")
rx = re.compile(r"[hms]")
days = int(arr[0])
hms = rx.sub("", arr[2]).split(":")

seconds = ((days * 24 + int(hms[0])) * 60 + int(hms[1])) * 60 + int(hms[2])
print("uptime.value {0}".format(seconds / 86400.0))