Struct Class

pub struct Class(/* private fields */);

DNS CLASSes.

The domain name space is partitioned into separate classes for different network types. That is, each class has its own separate record tree starting at the root. However, in practice, only the IN class is really relevant.

In addition, there are query classes or QCLASSes that are used in questions or UPDATE queries, namely NONE and ANY (or *).

Classes are represented by a 16 bit value. The enum wraps these values.

See RFC 1034 for the introduction of classes, section 3.2 of RFC 6895 for a discussion of the current state of afairs, and the DNS CLASSes IANA registry for an overview of assigned values. This type is complete as of the registry update of 2019-01-28.

Implementations

impl Class

pub const IN: Class = _

Internet (IN).

This class is defined in RFC 1035 and really the only one relevant at all.

pub const CH: Class = _

Chaosnet (CH).

A network protocol developed at MIT in the 1970s. Reused by BIND for built-in server information zones.“,

pub const HS: Class = _

Hesiod (HS).

A system information protocol part of MIT’s Project Athena.“,

pub const NONE: Class = _

Query class None.

Defined in RFC 2136, this class is used in UPDATE queries to require that an RRset does not exist prior to the update.“,

pub const ANY: Class = _

Query class * (ANY).

This class can be used in a query to indicate that records for the given name from any class are requested.“,

impl Class

pub const COMPOSE_LEN: u16 = 2u16

pub const fn from_int(value: u16) -> Self

Returns a value from its raw integer value.

pub const fn to_int(self) -> u16

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 Class

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

impl Class

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

Trait Implementations

impl Clone for Class

fn clone(&self) -> Class

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Class

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

Formats the value using the given formatter.

impl Display for Class

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

Formats the value using the given formatter.

impl<'a> From<&'a Class> for u16

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

Converts to this type from the input type.

impl From<Class> for u16

fn from(value: Class) -> Self

Converts to this type from the input type.

impl From<u16> for Class

fn from(value: u16) -> Self

Converts to this type from the input type.

impl FromStr for Class

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 Class

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 Class

fn cmp(&self, other: &Class) -> 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 for Class

fn eq(&self, other: &Class) -> 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 for Class

fn partial_cmp(&self, other: &Class) -> 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 Class

impl Eq for Class

impl StructuralPartialEq for Class