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A DNS message.

    @ivar id: The query id; the default is a randomly chosen id.
    @type id: int
    @ivar flags: The DNS flags of the message.  @see: RFC 1035 for an
    explanation of these flags.
    @type flags: int
    @ivar question: The question section.
    @type question: list of dns.rrset.RRset objects
    @ivar answer: The answer section.
    @type answer: list of dns.rrset.RRset objects
    @ivar authority: The authority section.
    @type authority: list of dns.rrset.RRset objects
    @ivar additional: The additional data section.
    @type additional: list of dns.rrset.RRset objects
    @ivar edns: The EDNS level to use.  The default is -1, no Edns.
    @type edns: int
    @ivar ednsflags: The EDNS flags
    @type ednsflags: long
    @ivar payload: The EDNS payload size.  The default is 0.
    @type payload: int
    @ivar options: The EDNS options
    @type options: list of dns.edns.Option objects
    @ivar request_payload: The associated request's EDNS payload size.
    @type request_payload: int
    @ivar keyring: The TSIG keyring to use.  The default is None.
    @type keyring: dict
    @ivar keyname: The TSIG keyname to use.  The default is None.
    @type keyname: dns.name.Name object
    @ivar keyalgorithm: The TSIG algorithm to use; defaults to
    dns.tsig.default_algorithm.  Constants for TSIG algorithms are defined
    in dns.tsig, and the currently implemented algorithms are
    HMAC_MD5, HMAC_SHA1, HMAC_SHA224, HMAC_SHA256, HMAC_SHA384, and
    HMAC_SHA512.
    @type keyalgorithm: string
    @ivar request_mac: The TSIG MAC of the request message associated with
    this message; used when validating TSIG signatures.   @see: RFC 2845 for
    more information on TSIG fields.
    @type request_mac: string
    @ivar fudge: TSIG time fudge; default is 300 seconds.
    @type fudge: int
    @ivar original_id: TSIG original id; defaults to the message's id
    @type original_id: int
    @ivar tsig_error: TSIG error code; default is 0.
    @type tsig_error: int
    @ivar other_data: TSIG other data.
    @type other_data: string
    @ivar mac: The TSIG MAC for this message.
    @type mac: string
    @ivar xfr: Is the message being used to contain the results of a DNS
    zone transfer?  The default is False.
    @type xfr: bool
    @ivar origin: The origin of the zone in messages which are used for
    zone transfers or for DNS dynamic updates.  The default is None.
    @type origin: dns.name.Name object
    @ivar tsig_ctx: The TSIG signature context associated with this
    message.  The default is None.
    @type tsig_ctx: hmac.HMAC object
    @ivar had_tsig: Did the message decoded from wire format have a TSIG
    signature?
    @type had_tsig: bool
    @ivar multi: Is this message part of a multi-message sequence?  The
    default is false.  This variable is used when validating TSIG signatures
    on messages which are part of a zone transfer.
    @type multi: bool
    @ivar first: Is this message standalone, or the first of a multi
    message sequence?  This variable is used when validating TSIG signatures
    on messages which are part of a zone transfer.
    @type first: bool
    @ivar index: An index of rrsets in the message.  The index key is
    (section, name, rdclass, rdtype, covers, deleting).  Indexing can be
    disabled by setting the index to None.
    @type index: dict
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        @type name: dns.name.Name object
        @param rdclass: the class of the RRset
        @type rdclass: int
        @param rdtype: the type of the RRset
        @type rdtype: int
        @param covers: the covers value of the RRset
        @type covers: int
        @param deleting: the deleting value of the RRset
        @type deleting: int
        @param create: If True, create the RRset if it is not found.
        The created RRset is appended to I{section}.
        @type create: bool
        @param force_unique: If True and create is also True, create a
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        @param name: the name of the RRset
        @type name: dns.name.Name object
        @param rdclass: the class of the RRset
        @type rdclass: int
        @param rdtype: the type of the RRset
        @type rdtype: int
        @param covers: the covers value of the RRset
        @type covers: int
        @param deleting: the deleting value of the RRset
        @type deleting: int
        @param create: If True, create the RRset if it is not found.
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        @type create: bool
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        @param max_size: The maximum size of the wire format output; default
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        but a keyname is not, then the key used will be the first key in the
        keyring.  Note that the order of keys in a dictionary is not defined,
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        @type keyname: dns.name.Name or string
        @param fudge: TSIG time fudge; default is 300 seconds.
        @type fudge: int
        @param original_id: TSIG original id; defaults to the message's id
        @type original_id: int
        @param tsig_error: TSIG error code; default is 0.
        @type tsig_error: int
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        EDNS0'.
        @type edns: int or bool or None
        @param ednsflags: EDNS flag values.
        @type ednsflags: int
        @param payload: The EDNS sender's payload field, which is the maximum
        size of UDP datagram the sender can handle.
        @type payload: int
        @param request_payload: The EDNS payload size to use when sending
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    variable contains the offset from the beginning of wire of the next octet
    to be read.
    @type current: int
    @ivar updating: Is the message a dynamic update?
    @type updating: bool
    @ivar one_rr_per_rrset: Put each RR into its own RRset?
    @type one_rr_per_rrset: bool
    @ivar ignore_trailing: Ignore trailing junk at end of request?
    @type ignore_trailing: bool
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											cCsHt|j�}|dkr$t�ntjd|jd �\|j_|j_}}}}d|_t	j
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�}|j	�|S(s)Convert a DNS wire format message into a message
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    I{request_mac} should be set to the MAC of that request.
    @type request_mac: string
    @param xfr: Is this message part of a zone transfer?
    @type xfr: bool
    @param origin: If the message is part of a zone transfer, I{origin}
    should be the origin name of the zone.
    @type origin: dns.name.Name object
    @param tsig_ctx: The ongoing TSIG context, used when validating zone
    transfers.
    @type tsig_ctx: hmac.HMAC object
    @param multi: Is this message part of a multiple message sequence?
    @type multi: bool
    @param first: Is this message standalone, or the first of a multi
    message sequence?
    @type first: bool
    @param question_only: Read only up to the end of the question section?
    @type question_only: bool
    @param one_rr_per_rrset: Put each RR into its own RRset
    @type one_rr_per_rrset: bool
    @param ignore_trailing: Ignore trailing junk at end of request?
    @type ignore_trailing: bool
    @raises ShortHeader: The message is less than 12 octets long.
    @raises TrailingJunk: There were octets in the message past the end
    of the proper DNS message.
    @raises BadEDNS: An OPT record was in the wrong section, or occurred more
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    @raises BadTSIG: A TSIG record was not the last record of the additional
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