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path: root/project2/proj2_s4498062/dns_server.py
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#!/usr/bin/env python2

""" DNS server

This script contains the code for starting a DNS server.
"""

import dns.server


def main():
    """DNS server"""
    # Parse arguments
    import argparse
    parser = argparse.ArgumentParser(description="DNS Server")
    parser.add_argument(
        "-c", "--caching", action="store_true",
        help="Enable caching")
    parser.add_argument(
        "-t", "--ttl", metavar="time", type=int, default=0,
        help="TTL value of cached entries (if > 0)")
    parser.add_argument(
        "-p", "--port", type=int, default=5353,
        help="Port which server listens on")
    args = parser.parse_args()

    # Start server
    server = dns.server.Server(args.port, args.caching, args.ttl)
    server.parse_zone_file('named.root')

    try:
        server.serve()
    except KeyboardInterrupt:
        server.shutdown()
        print

if __name__ == "__main__":
    main()