###WIP### Check internet and change default routes if three sites are down.

check_internet.py

#!/usr/bin/env python
import urllib2
import subprocess
import commands

debug = 1 


def open_url(url):
    try:
        response=urllib2.urlopen(url,timeout=5)
        return True
    except urllib2.URLError as err: 
        return False

def parse_route():
    output =  commands.getstatusoutput('ip -o route get 4.2.2.2 from default')
    output = output[1].split(" ")
    return  output[2]


if debug == 0:
    url_1 = open_url("http://www.google.com.br")
    url_2 = open_url("http://www.uol.com.br")
    url_3 = open_url("http://www.amazon.com")
elif debug == 1:
    url_1 = open_url("http://thissiteshouldfail.com/")
    url_2 = open_url("http://thissiteshouldfail.com/")
    url_3 = open_url("http://thissiteshouldfail.com/")
else:
    url_1 = open_url("http://www.google.com.br")
    url_2 = open_url("http://www.uol.com.br")
    url_3 = open_url("http://thissiteshouldfail.com")

if url_1 or url_2 or url_3:
    print "Must return ok to monitoring software"
else:
    #Need finish this in a nice and beautiful way ;)
    route = parse_route()
    route_del = "ip route del %s " %(route )
    route_add = "ip route add 192.168.0.9 default"
    print "commands.getstatusoutput(route_del)" 
    print "commands.getstatusoutput(route_add)"
    print "Must return change to monitoring software"