#!/usr/bin/python

def __run__(params):
    file = '/etc/network/interfaces'
    string = 'gateway'
    count_file = open(file, 'r').read().count(string)
    count_gw = 0
    # Python's 'netifaces' module only has the concept of
    # 'gateways' on newer versions. Read /proc/net/route instead 
    with open('/proc/net/route') as f:
        for line in f:
            fields = line.strip().split()
            if fields[1] == '00000000':
                count_gw = count_gw + 1

    if count_file > 1:
        return [2, "CRITICAL - More than 1 '%s' on '%s'" % (string, file)]
    if count_gw > 1: 
        return [2, "CRITICAL - More than 1 gateway configured"]
    else:
        return [0, "OK - No duplicated gateway found"]