Firewall on Demand

from django import template

from django.utils.safestring import mark_safe

from django.utils.encoding import force_unicode

import socket

register = template.Library()

@register.filter

def tofqdn(value):

    try:

        fqdn = socket.getfqdn(value)

        if fqdn == value:

            return False

        else:

            return fqdn

    except socket.gaierror:

        return False