twisted.names.dns._EDNSMessage : API documentation

An EDNS message.

Designed for compatibility with Message but with a narrower public interface.

Most importantly, _EDNSMessage.fromStr will interpret and remove OPT records that are present in the additional records section.

The OPT records are used to populate certain EDNS specific attributes.

_EDNSMessage.toStr will add suitable OPT records to the additional section to represent the extended EDNS information.

See Also https://tools.ietf.org/html/rfc6891

Instance Variable	id	See `__init__`
Instance Variable	answer	See `__init__`
Instance Variable	opCode	See `__init__`
Instance Variable	auth	See `__init__`
Instance Variable	trunc	See `__init__`
Instance Variable	recDes	See `__init__`
Instance Variable	recAv	See `__init__`
Instance Variable	rCode	See `__init__`
Instance Variable	ednsVersion	See `__init__`
Instance Variable	dnssecOK	See `__init__`
Instance Variable	authenticData	See `__init__`
Instance Variable	checkingDisabled	See `__init__`
Instance Variable	maxSize	See `__init__`
Instance Variable	queries	See `__init__`
Instance Variable	answers	See `__init__`
Instance Variable	authority	See `__init__`
Instance Variable	additional	See `__init__`
Method	__init__	Construct a new `_EDNSMessage`
Method	__repr__	Undocumented
Method	toStr	Encode to wire format by first converting to a standard `dns.Message`.
Method	fromStr	Decode from wire format, saving flags, values and records to this `_EDNSMessage` instance in place.
Instance Variable	_messageFactory	A constructor of `Message` instances. Called by `_toMessage` and `_fromMessage`.
Method	_toMessage	Convert to a standard `dns.Message`.
Class Method	_fromMessage	`Construct and return a new L(_EDNSMessage} whose attributes and records are derived from the attributes and records of C{message} (a L{Message} instance)`

Inherited from FancyEqMixin:

Method	__eq__	Undocumented
Method	__ne__	Undocumented

id =

See __init__

answer =

See __init__

opCode =

See __init__

auth =

See __init__

trunc =

See __init__

recDes =

See __init__

recAv =

See __init__

rCode =

See __init__

ednsVersion =

See __init__

dnssecOK =

See __init__

authenticData =

See __init__

checkingDisabled =

See __init__

maxSize =

See __init__

queries =

See __init__

answers =

See __init__

authority =

See __init__

additional =

See __init__

_messageFactory =

A constructor of Message instances. Called by _toMessage and _fromMessage.

def __init__(self, id=0, answer=False, opCode=OP_QUERY, auth=False, trunc=False, recDes=False, recAv=False, rCode=0, ednsVersion=0, dnssecOK=False, authenticData=False, checkingDisabled=False, maxSize=512, queries=None, answers=None, authority=None, additional=None): (source)

Construct a new L{_EDNSMessage}

@see U{RFC1035 section-4.1.1<https://tools.ietf.org/html/rfc1035#section-4.1.1>}
@see U{RFC2535 section-6.1<https://tools.ietf.org/html/rfc2535#section-6.1>}
@see U{RFC3225 section-3<https://tools.ietf.org/html/rfc3225#section-3>}
@see U{RFC6891 section-6.1.3<https://tools.ietf.org/html/rfc6891#section-6.1.3>}

@param id: A 16 bit identifier assigned by the program that generates
    any kind of query.  This identifier is copied the corresponding
    reply and can be used by the requester to match up replies to
    outstanding queries.
@type id: L{int}

@param answer: A one bit field that specifies whether this message is a
    query (0), or a response (1).
@type answer: L{bool}

@param opCode: A four bit field that specifies kind of query in this
    message.  This value is set by the originator of a query and copied
    into the response.
@type opCode: L{int}

@param auth: Authoritative Answer - this bit is valid in responses, and
    specifies that the responding name server is an authority for the
    domain name in question section.
@type auth: L{bool}

@param trunc: Truncation - specifies that this message was truncated due
    to length greater than that permitted on the transmission channel.
@type trunc: L{bool}

@param recDes: Recursion Desired - this bit may be set in a query and is
    copied into the response.  If set, it directs the name server to
    pursue the query recursively. Recursive query support is optional.
@type recDes: L{bool}

@param recAv: Recursion Available - this bit is set or cleared in a
    response, and denotes whether recursive query support is available
    in the name server.
@type recAv: L{bool}

@param rCode: Extended 12-bit RCODE. Derived from the 4 bits defined in
    U{RFC1035 4.1.1<https://tools.ietf.org/html/rfc1035#section-4.1.1>}
    and the upper 8bits defined in U{RFC6891
    6.1.3<https://tools.ietf.org/html/rfc6891#section-6.1.3>}.
@type rCode: L{int}

@param ednsVersion: Indicates the EDNS implementation level. Set to
    L{None} to prevent any EDNS attributes and options being added to
    the encoded byte string.
@type ednsVersion: L{int} or L{None}

@param dnssecOK: DNSSEC OK bit as defined by
    U{RFC3225 3<https://tools.ietf.org/html/rfc3225#section-3>}.
@type dnssecOK: C{bool}

@param authenticData: A flag indicating in a response that all the data
    included in the answer and authority portion of the response has
    been authenticated by the server according to the policies of that
    server.
    See U{RFC2535 section-6.1<https://tools.ietf.org/html/rfc2535#section-6.1>}.
@type authenticData: L{bool}

@param checkingDisabled: A flag indicating in a query that pending
    (non-authenticated) data is acceptable to the resolver sending the
    query.
    See U{RFC2535 section-6.1<https://tools.ietf.org/html/rfc2535#section-6.1>}.
@type authenticData: L{bool}

@param maxSize: The requestor's UDP payload size is the number of octets
    of the largest UDP payload that can be reassembled and delivered in
    the requestor's network stack.
@type maxSize: L{int}

@param queries: The L{list} of L{Query} associated with this message.
@type queries: L{list} of L{Query}

@param answers: The L{list} of answers associated with this message.
@type answers: L{list} of L{RRHeader}

@param authority: The L{list} of authority records associated with this
    message.
@type authority: L{list} of L{RRHeader}

@param additional: The L{list} of additional records associated with
    this message.
@type additional: L{list} of L{RRHeader}

def __repr__(self): (source)

Undocumented

def _toMessage(self): (source)

Convert to a standard dns.Message.

If ednsVersion is not None, an _OPTHeader instance containing all the EDNS specific attributes and options will be appended to the list of additional records.

Returns A dns.Message (type: dns.Message)

def toStr(self): (source)

Encode to wire format by first converting to a standard dns.Message.

Returns A bytes string.

@classmethod
def _fromMessage(cls, message): (source)

Construct and return a new L(_EDNSMessage} whose attributes and records
are derived from the attributes and records of C{message} (a L{Message}
instance)

If present, an I{OPT} record will be extracted from the C{additional}
section and its attributes and options will be used to set the EDNS
specific attributes C{extendedRCODE}, c{ednsVersion}, c{dnssecOK},
c{ednsOptions}.

The C{extendedRCODE} will be combined with C{message.rCode} and assigned
to C{self.rCode}.

@param message: The source L{Message}.
@type message: L{Message}

@return: A new L{_EDNSMessage}
@rtype: L{_EDNSMessage}

def fromStr(self, bytes): (source)

Decode from wire format, saving flags, values and records to this _EDNSMessage instance in place.

Parameters bytes The full byte string to be decoded. (type: bytes)

API Documentation for Twisted, generated by pydoctor at 2016-04-11 10:39:53.

twisted.names.dns._EDNSMessage(tputil.FancyEqMixin, object) class documentation

`twisted.names.dns._EDNSMessage(tputil.FancyEqMixin, object)` class documentation