Struct trust_dns::op::message::Message
[−]
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pub struct Message { // some 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
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fn new() -> Self
fn truncate(&self) -> Self
fn id(&mut self, id: u16) -> &mut Self
fn message_type(&mut self, message_type: MessageType) -> &mut Self
fn op_code(&mut self, op_code: OpCode) -> &mut Self
fn authoritative(&mut self, authoritative: bool) -> &mut Self
fn truncated(&mut self, truncated: bool) -> &mut Self
fn recursion_desired(&mut self, recursion_desired: bool) -> &mut Self
fn recursion_available(&mut self, recursion_available: bool) -> &mut Self
fn authentic_data(&mut self, authentic_data: bool) -> &mut Self
fn checking_disabled(&mut self, checking_disabled: bool) -> &mut Self
fn response_code(&mut self, response_code: ResponseCode) -> &mut Self
fn add_query(&mut self, query: Query) -> &mut Self
fn add_all_queries(&mut self, queries: &[Query]) -> &mut Self
fn add_answer(&mut self, record: Record) -> &mut Self
fn add_all_answers(&mut self, vector: &[&Record]) -> &mut Self
fn add_name_server(&mut self, record: Record) -> &mut Self
fn add_all_name_servers(&mut self, vector: &[&Record]) -> &mut Self
fn add_additional(&mut self, record: Record) -> &mut Self
fn set_edns(&mut self, edns: Edns)
fn add_sig0(&mut self, record: Record) -> &mut Self
fn get_id(&self) -> u16
see Header::get_id()
fn get_message_type(&self) -> MessageType
see Header::get_message_type()
fn get_op_code(&self) -> OpCode
see Header::get_op_code()
fn is_authoritative(&self) -> bool
see Header::is_authoritative()
fn is_truncated(&self) -> bool
see Header::is_truncated()
fn is_recursion_desired(&self) -> bool
see Header::is_recursion_desired()
fn is_recursion_available(&self) -> bool
see Header::is_recursion_available()
fn is_authentic_data(&self) -> bool
see Header::is_authentic_data()
fn is_checking_disabled(&self) -> bool
see Header::is_checking_disabled()
fn get_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
fn get_queries(&self) -> &[Query]
Question Carries the query name and other query parameters.
fn get_answers(&self) -> &[Record]
Answer Carries RRs which directly answer the query.
fn get_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.
fn get_additional(&self) -> &[Record]
Additional Carries RRs which may be helpful in using the RRs in the
other sections.
fn get_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.
fn get_max_payload(&self) -> u16
Return value
the max payload value as it's defined in the EDNS section.
fn get_version(&self) -> u8
Return value
the version as defined in the EDNS record
Trait Implementations
impl PartialEq for Message
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fn eq(&self, __arg_0: &Message) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Message) -> bool
This method tests for !=
.
impl Debug for Message
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impl UpdateMessage for Message
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to reduce errors in using the Message struct as an Update, this will do the call throughs to properly do that.
fn get_id(&self) -> u16
fn add_zone(&mut self, query: Query)
fn add_pre_requisite(&mut self, record: Record)
fn add_all_pre_requisites(&mut self, vector: &[&Record])
fn add_update(&mut self, record: Record)
fn add_all_updates(&mut self, vector: &[&Record])
fn add_additional(&mut self, record: Record)
fn get_zones(&self) -> &[Query]
fn get_pre_requisites(&self) -> &[Record]
fn get_updates(&self) -> &[Record]
fn get_additional(&self) -> &[Record]
fn get_sig0(&self) -> &[Record]
This is used to authenticate update messages. Read more