Struct trust_dns_proto::op::message::Message

pub struct Message { /* fields omitted */ }

The basic request and response datastructure, used for all DNS protocols.

RFC 1035, DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION, November 1987

4.1. Format

All communications inside of the domain protocol are carried in a single
format called a message.  The top level format of message is divided
into 5 sections (some of which are empty in certain cases) shown below:

    +--------------------------+
    |        Header            |
    +--------------------------+
    |  Question / Zone         | the question for the name server
    +--------------------------+
    |   Answer  / Prerequisite | RRs answering the question
    +--------------------------+
    | Authority / Update       | RRs pointing toward an authority
    +--------------------------+
    |      Additional          | RRs holding additional information
    +--------------------------+

The header section is always present.  The header includes fields that
specify which of the remaining sections are present, and also specify
whether the message is a query or a response, a standard query or some
other opcode, etc.

The names of the sections after the header are derived from their use in
standard queries.  The question section contains fields that describe a
question to a name server.  These fields are a query type (QTYPE), a
query class (QCLASS), and a query domain name (QNAME).  The last three
sections have the same format: a possibly empty list of concatenated
resource records (RRs).  The answer section contains RRs that answer the
question; the authority section contains RRs that point toward an
authoritative name server; the additional records section contains RRs
which relate to the query, but are not strictly answers for the
question.

By default Message is a Query. Use the Message::as_update() to create and update, or Message::new_update()

Methods

impl Message

pub fn new() -> Self

Returns a new "empty" Message

pub fn error_msg(     id: u16,     op_code: OpCode,     response_code: ResponseCode ) -> Message

Returns a Message constructed with error details to return to a client

Arguments

• id - message id should match the request message id
• op_code - operation of the request
• response_code - the error code for the response

pub fn truncate(&self) -> Self

Truncates a Message, this blindly removes all response fields and sets trucation to true

pub fn set_id(&mut self, id: u16) -> &mut Self

see Header::set_id

pub fn set_message_type(&mut self, message_type: MessageType) -> &mut Self

see Header::set_message_type

pub fn set_op_code(&mut self, op_code: OpCode) -> &mut Self

see Header::set_op_code

pub fn set_authoritative(&mut self, authoritative: bool) -> &mut Self

see Header::set_authoritative

pub fn set_truncated(&mut self, truncated: bool) -> &mut Self

see Header::set_truncated

pub fn set_recursion_desired(&mut self, recursion_desired: bool) -> &mut Self

see Header::set_recursion_desired

pub fn set_recursion_available(     &mut self,     recursion_available: bool ) -> &mut Self

see Header::set_recursion_available

pub fn set_authentic_data(&mut self, authentic_data: bool) -> &mut Self

see Header::set_authentic_data

pub fn set_checking_disabled(&mut self, checking_disabled: bool) -> &mut Self

see Header::set_checking_disabled

pub fn set_response_code(&mut self, response_code: ResponseCode) -> &mut Self

see Header::set_response_code

pub fn add_query(&mut self, query: Query) -> &mut Self

Add a query to the Message, either the query response from the server, or the request Query.

pub fn add_queries<Q, I>(&mut self, queries: Q) -> &mut Self where     Q: IntoIterator<Item = Query, IntoIter = I>,     I: Iterator<Item = Query>,

Adds an iterator over a set of Queries to be added to the message

pub fn add_answer(&mut self, record: Record) -> &mut Self

Add an answer to the Message

pub fn add_answers<R, I>(&mut self, records: R) -> &mut Self where     R: IntoIterator<Item = Record, IntoIter = I>,     I: Iterator<Item = Record>,

Add all the records from the iterator to the answers section of the Message

pub fn insert_answers(&mut self, records: Vec<Record>)

Sets the answers to the specified set of Records.

Panics

Will panic if answer records are already associated to the message.

pub fn add_name_server(&mut self, record: Record) -> &mut Self

Add a name server record to the Message

pub fn add_name_servers<R, I>(&mut self, records: R) -> &mut Self where     R: IntoIterator<Item = Record, IntoIter = I>,     I: Iterator<Item = Record>,

Add all the records in the Iterator to the name server section of the message

pub fn insert_name_servers(&mut self, records: Vec<Record>)

Sets the name_servers to the specified set of Records.

Panics

Will panic if name_servers records are already associated to the message.

pub fn add_additional(&mut self, record: Record) -> &mut Self

A an addtional Record to the message

pub fn insert_additionals(&mut self, records: Vec<Record>)

Sets the additional to the specified set of Records.

Panics

Will panic if additional records are already associated to the message.

pub fn set_edns(&mut self, edns: Edns) -> &mut Self

Add the EDNS section the the Message

pub fn id(&self) -> u16

see Header::id()

pub fn message_type(&self) -> MessageType

see Header::message_type()

pub fn op_code(&self) -> OpCode

see Header::op_code()

pub fn authoritative(&self) -> bool

see Header::authoritative()

pub fn truncated(&self) -> bool

see Header::truncated()

pub fn recursion_desired(&self) -> bool

see Header::recursion_desired()

pub fn recursion_available(&self) -> bool

see Header::recursion_available()

pub fn authentic_data(&self) -> bool

see Header::authentic_data()

pub fn checking_disabled(&self) -> bool

see Header::checking_disabled()

pub fn response_code(&self) -> ResponseCode

Return value

The ResponseCode, if this is an EDNS message then this will join the section from the OPT record to create the EDNS ResponseCode

pub fn queries(&self) -> &[Query]

Question        Carries the query name and other query parameters.

pub fn answers(&self) -> &[Record]

Answer          Carries RRs which directly answer the query.

pub fn take_answers(&mut self) -> Vec<Record>

Removes all the answers from the Message

pub fn name_servers(&self) -> &[Record]

Authority       Carries RRs which describe other authoritative servers.
                May optionally carry the SOA RR for the authoritative
                data in the answer section.

pub fn take_name_servers(&mut self) -> Vec<Record>

Remove the name servers from the Message

pub fn additionals(&self) -> &[Record]

Additional      Carries RRs which may be helpful in using the RRs in the
                other sections.

pub fn take_additionals(&mut self) -> Vec<Record>

Remove the additional Records from the Message

pub fn edns(&self) -> Option<&Edns>

RFC 6891, EDNS(0) Extensions, April 2013

6.1.1.  Basic Elements

 An OPT pseudo-RR (sometimes called a meta-RR) MAY be added to the
 additional data section of a request.

 The OPT RR has RR type 41.

 If an OPT record is present in a received request, compliant
 responders MUST include an OPT record in their respective responses.

 An OPT record does not carry any DNS data.  It is used only to
 contain control information pertaining to the question-and-answer
 sequence of a specific transaction.  OPT RRs MUST NOT be cached,
 forwarded, or stored in or loaded from master files.

 The OPT RR MAY be placed anywhere within the additional data section.
 When an OPT RR is included within any DNS message, it MUST be the
 only OPT RR in that message.  If a query message with more than one
 OPT RR is received, a FORMERR (RCODE=1) MUST be returned.  The
 placement flexibility for the OPT RR does not override the need for
 the TSIG or SIG(0) RRs to be the last in the additional section
 whenever they are present.

Return value

Returns the EDNS record if it was found in the additional section.

pub fn edns_mut(&mut self) -> &mut Edns

If edns is_none, this will create a new default Edns.

pub fn max_payload(&self) -> u16

Return value

the max payload value as it's defined in the EDNS section.

pub fn version(&self) -> u8

Return value

the version as defined in the EDNS record

pub fn sig0(&self) -> &[Record]

RFC 2535, Domain Name System Security Extensions, March 1999

A DNS request may be optionally signed by including one or more SIGs
 at the end of the query. Such SIGs are identified by having a "type
 covered" field of zero. They sign the preceding DNS request message
 including DNS header but not including the IP header or any request
 SIGs at the end and before the request RR counts have been adjusted
 for the inclusions of any request SIG(s).

Return value

The sig0, i.e. signed record, for verifying the sending and package integrity

pub fn read_queries(     decoder: &mut BinDecoder,     count: usize ) -> ProtoResult<Vec<Query>>

Attempts to read the specified number of Querys

pub fn read_records(     decoder: &mut BinDecoder,     count: usize,     is_additional: bool ) -> ProtoResult<(Vec<Record>, Option<Edns>, Vec<Record>)>

Attempts to read the specified number of records

Returns

This returns a tuple of first standard Records, then a possibly associated Edns, and then finally any optionally associated SIG0 records.

pub fn from_vec(buffer: &[u8]) -> ProtoResult<Message>

Decodes a message from the buffer.

pub fn to_vec(&self) -> Result<Vec<u8>, ProtoError>

Encodes the Message into a buffer

pub fn finalize<MF: MessageFinalizer>(     &mut self,     finalizer: &MF,     inception_time: u32 ) -> ProtoResult<()>

Finalize the message prior to sending.

Subsequent to calling this, the Message should not change.

Trait Implementations

impl Clone for Message

fn clone(&self) -> Message

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Message

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl PartialEq for Message

fn eq(&self, other: &Message) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Message) -> bool

This method tests for !=.

impl Default for Message

fn default() -> Message

Returns the "default value" for a type.

impl EncodableMessage for Message

fn header(&self) -> &Header

The Header associated with this Message

fn queries_len(&self) -> usize

return the length of the set of queries

fn emit_queries(&self, encoder: &mut BinEncoder) -> ProtoResult<()>

Emit the queries section of the EncodableMessage, if there are none, it's acceptable to return Ok(())

fn answers_len(&self) -> usize

return the length of the set of queries

fn emit_answers(&self, encoder: &mut BinEncoder) -> ProtoResult<()>

Emit the answers section of the EncodableMessage, if there are none, it's acceptable to return Ok(())

fn name_servers_len(&self) -> usize

return the length of the set of queries

fn emit_name_servers(&self, encoder: &mut BinEncoder) -> ProtoResult<()>

Emit the name_servers section of the EncodableMessage, if there are none, it's acceptable to return Ok(())

fn additionals_len(&self) -> usize

return the length of the set of queries

fn emit_additionals(&self, encoder: &mut BinEncoder) -> ProtoResult<()>

Emit the additionals section of the EncodableMessage, if there are none, it's acceptable to return Ok(())

fn edns(&self) -> Option<&Edns>

Extended DNS options associated with this message

fn sig0(&self) -> &[Record]

Any SIG0 records for signed messages

fn update_header_counts(&self, include_sig0: bool) -> Header

Returns a new Header with accurate counts for each Message section

impl<'r> BinDecodable<'r> for Message

fn read(decoder: &mut BinDecoder<'r>) -> ProtoResult<Self>

Read the type from the stream

fn from_bytes(bytes: &'r [u8]) -> ProtoResult<Self>

Returns the object in binary form

impl Into<DnsRequest> for Message

fn into(self) -> DnsRequest

Performs the conversion.

impl From<DnsResponse> for Message

fn from(response: DnsResponse) -> Message

Performs the conversion.

impl From<Message> for DnsResponse

fn from(message: Message) -> DnsResponse

Performs the conversion.