Execute passed command if IP present on machine (cluster util)

cmdvip.py

#!/usr/bin/env python
__author__ = 'Giorgio Crivellari'
__version__ = "0.1"

import os
import sys
import re
import subprocess
import socket
from subprocess import call


def checkLocalIPs(ip):
    """
    Return True if passed IP is on local machine
    :rtype : Boolean
    """
    ret = []
    co = subprocess.Popen(['ifconfig'], stdout=subprocess.PIPE)
    ifconfig = co.stdout.read()
    ip_regex = re.compile(
        '((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-4]|2[0-5][0-9]|[01]?[0-9][0-9]?))')
    for match in ip_regex.findall(ifconfig, re.MULTILINE):
        if ip in match[0]: return True
    return False


if __name__ == "__main__":
    if len(sys.argv) < 2:
        sys.stderr.write("CMDVIP execute passed command only when VIP is assigned on a local network interface.\n\n"
                "Usage:\n\t"
                "cmdvip <VIP> <COMMAND>\n"
        )
        sys.exit(1)

    if os.getuid() != 0:
        sys.stderr.write("User must have root privileges to check network interfaces")

    hostname = sys.argv[1]
    command = sys.argv[2:]

    try:
        addr = socket.gethostbyname(hostname)
    except socket.gaierror, ex:
        sys.stderr.write("VIP %s has no resolution." % hostname)
        sys.exit(2)

    if checkLocalIPs(addr):
        #call(command)
		os.startfile(command)
    sys.exit(0)