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#!/usr/bin/env python2
""" A recursive DNS server
This module provides a recursive DNS server. You will have to implement this
server using the algorithm described in section 4.3.2 of RFC 1034.
"""
from threading import Thread
class RequestHandler(Thread):
""" A handler for requests to the DNS server """
def __init__(self):
""" Initialize the handler thread """
super(RequestHandler, self).__init__()
self.daemon = True
def run(self):
""" Run the handler thread """
# TODO: Handle DNS request
pass
class Server(object):
""" A recursive DNS server """
def __init__(self, port, caching, ttl):
""" Initialize the server
Args:
port (int): port that server is listening on
caching (bool): server uses resolver with caching if true
ttl (int): ttl for records (if > 0) of cache
"""
self.caching = caching
self.ttl = ttl
self.port = port
self.done = False
# TODO: create socket
def serve(self):
""" Start serving request """
# TODO: start listening
while not self.done:
# TODO: receive request and open handler
pass
def shutdown(self):
""" Shutdown the server """
self.done = True
# TODO: shutdown socket
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