Enum Opcode

pub enum Opcode {
    Query,
    IQuery,
    Status,
    Notify,
    Update,
    Dso,
    Int(u8),
}

DNS OpCodes.

The opcode specifies the kind of query to be performed.

The opcode and its initial set of values are defined in RFC 1035. Additional values have been defined over time. All currently assigned values can be found in the IANA registry. This type is complete as of 2019-12-23.

Variants

Query

A standard query (0).

This query requests all records matching the name, class, and record type given in the query’s question section.

This value is defined in RFC 1035.

IQuery

An inverse query (IQUERY) (1, obsolete).

The idea behind inverse queries was to provide a single answer and ask the DNS for all the questions that would lead to this answer. This kind of query has always been optional, was never widely supported, and has therefore been declared obsolete.

This value was defined in RFC 1035 and obsoleted by RFC 3425.

Status

A server status request (2).

This value is defined in RFC 1035. The status request itself was defined as experimental and ‘to be defined’ in RFC 1034 and seems to never have been mentioned ever again.

Notify

A NOTIFY query (4).

NOTIFY queries allow primary servers to inform secondary servers when a zone has changed.

This value and the NOTIFY query are defined in RFC 1996.

Update

An UPDATE query (5).

The UPDATE query can be used to alter zone content managed by an authoritative server.

This value and the UPDATE query are defined in RFC 2136.

Dso

DNS Stateful operations (DSO) (6).

The DSO query can be used to manage stateful sessions between two DNS endpoints.

This value and the DOS query are defined in RFC 8490.

Int(u8)

A raw value given through its integer.

Implementations

impl Opcode

pub const COMPOSE_LEN: u16 = 1u16

pub const fn from_int(value: u8) -> Self

Returns a value from its raw integer value.

pub const fn to_int(self) -> u8

Returns the raw integer value for a value.

pub fn from_mnemonic(m: &[u8]) -> Option<Self>

Returns a value from a well-defined mnemonic.

pub const fn to_mnemonic(self) -> Option<&'static [u8]>

Returns the mnemonic for this value if there is one.

This will also return a mnemonic if a well-defined variant is hidden in a Int variant.

pub fn parse<'a, Octs: AsRef<[u8]> + ?Sized>( parser: &mut Parser<'a, Octs>, ) -> Result<Self, ParseError>

pub fn compose<Target: OctetsBuilder + ?Sized>( &self, target: &mut Target, ) -> Result<(), Target::AppendError>

impl Opcode

pub fn from_bytes(bytes: &[u8]) -> Option<Self>

impl Opcode

pub fn scan<S: Scanner>(scanner: &mut S) -> Result<Self, S::Error>

Trait Implementations

impl Clone for Opcode

fn clone(&self) -> Opcode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Opcode

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

Formats the value using the given formatter.

impl Display for Opcode

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

Formats the value using the given formatter.

impl<'a> From<&'a Opcode> for u8

fn from(value: &'a Opcode) -> Self

Converts to this type from the input type.

impl From<Opcode> for u8

fn from(value: Opcode) -> Self

Converts to this type from the input type.

impl From<u8> for Opcode

fn from(value: u8) -> Self

Converts to this type from the input type.

impl FromStr for Opcode

type Err = FromStrError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Opcode

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Opcode

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq<Opcode> for u8

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<u8> for Opcode

fn eq(&self, other: &u8) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq for Opcode

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd<Opcode> for u8

fn partial_cmp(&self, other: &Opcode) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<u8> for Opcode

fn partial_cmp(&self, other: &u8) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd for Opcode

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Opcode

impl Eq for Opcode