#!/usr/bin/python
#    ldd - DNS implementation in Python
#    Copyright (C) 2006 Fredrik Tolf <fredrik@dolda2000.com>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


import os
import sys
import getopt
import socket
import signal
import imp
import logging

from ldd import server

cfname = "/etc/lddd/conf"
port = 53
daemonize = True
opts, args = getopt.getopt(sys.argv[1:], "ndc:p:")
for o, a in opts:
    if o == "-d":
        logging.basicConfig(level = logging.DEBUG)
        daemonize = False
    if o == "-c":
        cfname = a
    if o == "-n":
        daemonize = False
    if o == "-p":
        port = int(a)

logger = logging.getLogger("ldd.daemon")

def diehandler(signum, frame):
    global alive
    alive = False

for sig in [getattr(signal, "SIG" + s) for s in ["INT", "TERM"]]:
    signal.signal(sig, diehandler)

srv = server.dnsserver()

cf = open(cfname, "r")
cmod = imp.load_module("servconf", cf, cfname, ("", "r", imp.PY_SOURCE))
cf.close()

cmod.setup(srv)
if(len(srv.sockets) < 1):
    sk = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
    sk.bind(("", port))
    srv.addsock(socket.AF_INET6, sk)
logger.info("config OK, starting server")

alive = True
srv.start()

if daemonize:
    if(os.fork() != 0):
        sys.exit(0)
    os.chdir("/")

while alive:
    signal.pause()
logger.info("terminating")
srv.stop()