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Async DNS server

Future plans:
    - Better config file format maybe
    - Make sure to differentiate between different classes
    - notice truncation bit

Important: No additional processing is done on some of the record types.
This violates the most basic RFC and is just plain annoying
for resolvers to deal with.  Fix it.

@author: Jp Calderone
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    @ivar cache: A L{Cache<twisted.names.cache.CacheResolver>} instance whose
        C{cacheResult} method is called when a response is received from one of
        C{clients}. Defaults to L{None} if no caches are specified. See
        C{caches} of L{__init__} for more details.
    @type cache: L{Cache<twisted.names.cache.CacheResolver>} or L{None}

    @ivar canRecurse: A flag indicating whether this server is capable of
        performing recursive DNS resolution.
    @type canRecurse: L{bool}

    @ivar resolver: A L{resolve.ResolverChain} containing an ordered list of
        C{authorities}, C{caches} and C{clients} to which queries will be
        dispatched.
    @type resolver: L{resolve.ResolverChain}

    @ivar verbose: See L{__init__}

    @ivar connections: A list of all the connected L{DNSProtocol} instances
        using this object as their controller.
    @type connections: C{list} of L{DNSProtocol} instances

    @ivar protocol: A callable used for building a DNS stream protocol. Called
        by L{DNSServerFactory.buildProtocol} and passed the L{DNSServerFactory}
        instance as the one and only positional argument.  Defaults to
        L{dns.DNSProtocol}.
    @type protocol: L{IProtocolFactory} constructor

    @ivar _messageFactory: A response message constructor with an initializer
         signature matching L{dns.Message.__init__}.
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    NrcCsng}|dur|�|�|dur|�|�|dur|�|�||_t�|�|_||_|r2|d|_g|_dS)a�
        @param authorities: Resolvers which provide authoritative answers.
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            answers. The first cache instance is assigned to
            C{DNSServerFactory.cache} and its C{cacheResult} method will be
            called when a response is received from one of C{clients}.
        @type caches: L{list} of L{Cache<twisted.names.cache.CacheResolver>} instances

        @param clients: Resolvers which are capable of performing recursive DNS
            lookups.
        @type clients: L{list} of L{IResolver} providers

        @param verbose: An integer controlling the verbosity of logging of
            queries and responses. Default is C{0} which means no logging. Set
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        @param message: The DNS message to be sent.
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        Generate a L{Message} instance suitable for use as the response to
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        the response, if supplied.

        The C{recAv} flag will be set on the response if the C{canRecurse} flag
        on this L{DNSServerFactory} is set to L{True}.

        The C{auth} flag will be set on the response if *any* of the supplied
        C{answers} have their C{auth} flag set to L{True}.

        The response will have the same C{maxSize} as the request.

        Additionally, the response will have a C{timeReceived} attribute whose
        value is that of the original request and the

        @see: L{dns._responseFromMessage}

        @param message: The request message
        @type message: L{Message}

        @param rCode: The response code which will be assigned to the response.
        @type message: L{int}

        @param answers: An optional list of answer records which will be
            assigned to the response.
        @type answers: L{list} of L{dns.RRHeader}

        @param authority: An optional list of authority records which will be
            assigned to the response.
        @type authority: L{list} of L{dns.RRHeader}

        @param additional: An optional list of additional records which will be
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        @return: A response L{Message} instance.
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        A callback used by L{DNSServerFactory.handleQuery} for handling the
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        with the resolved answer, authority and additional records.

        Marks the response message as authoritative if any of the resolved
        answers are found to be authoritative.

        The resolved answers count will be logged if C{DNSServerFactory.verbose}
        is C{>1}.

        @param response: Answer records, authority records and additional records
        @type response: L{tuple} of L{list} of L{dns.RRHeader} instances

        @param protocol: The DNS protocol instance to which to send a response
            message.
        @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol}

        @param message: The original DNS query message for which a response
            message will be constructed.
        @type message: L{dns.Message}

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        A callback used by L{DNSServerFactory.handleQuery} for handling deferred
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        An error message will be logged if C{DNSServerFactory.verbose} is C{>1}.

        @param failure: The reason for the failed resolution (as reported by
            C{self.resolver.query}).
        @type failure: L{Failure<twisted.python.failure.Failure>}

        @param protocol: The DNS protocol instance to which to send a response
            message.
        @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol}

        @param message: The original DNS query message for which a response
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        L{DNSServerFactory.gotResolverError} to the resulting deferred.

        Note: Multiple queries in a single message are not supported because
        there is no standard way to respond with multiple rCodes, auth,
        etc. This is consistent with other DNS server implementations. See
        U{http://tools.ietf.org/html/draft-ietf-dnsext-edns1-03} for a proposed
        solution.

        @param protocol: The DNS protocol instance to which to send a response
            message.
        @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol}

        @param message: The original DNS query message for which a response
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        @param address: The address to which the response message will be sent
            or L{None} if C{protocol} is a stream protocol.
        @type address: L{tuple} or L{None}

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        Override in a subclass.

        @param protocol: The DNS protocol instance to which to send a response
            message.
        @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol}

        @param message: The original DNS query message for which a response
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            message.
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        @param message: The original DNS query message for which a response
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        @type message: L{dns.Message}

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        @param protocol: The DNS protocol instance to which to send a response
            message.
        @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol}

        @param message: The original DNS query message for which a response
            message will be constructed.
        @type message: L{dns.Message}

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        protocol and origin address. If it returns L{False}, a C{dns.EREFUSED}
        response is sent back to the client.

        Otherwise the received message is dispatched to one of
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        L{DNSServerFactory.handleStatus}, L{DNSServerFactory.handleNotify}, or
        L{DNSServerFactory.handleOther} depending on the I{OPCODE} of the
        received message.

        If C{DNSServerFactory.verbose} is C{>0} all received messages will be
        logged in more or less detail depending on the value of C{verbose}.

        @param message: The DNS message that was received.
        @type message: L{dns.Message}

        @param proto: The DNS protocol instance which received the message
        @type proto: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol}

        @param address: The address from which the message was received. Only
            provided for messages received by datagram protocols. The origin of
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        @param message: The DNS message that was received.
        @type message: L{dns.Message}

        @param protocol: The DNS protocol instance which received the message
        @type protocol: L{dns.DNSDatagramProtocol} or L{dns.DNSProtocol}

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            provided for messages received by datagram protocols. The origin of
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            protocol C{transport} attribute.
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