Enum domain::base::iana::class::Class

pub enum Class {
    In,
    Ch,
    Hs,
    None,
    Any,
    Int(u16),
}

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.

Variants

In

Internet (IN).

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

Ch

Chaosnet (CH).

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

Hs

Hesiod (HS).

A system information protocol part of MIT's Project Athena.",

None

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.",

Any

Query class * (ANY).

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

Int(u16)

A raw value given through its integer.

Implementations

impl Class

pub fn from_int(value: u16) -> Self

Returns a value from its raw integer value.

pub 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 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.

impl Class

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

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 Compose for Class

fn compose<T: OctetsBuilder>(&self, target: &mut T) -> Result<(), ShortBuf>

Appends the concrete representation of the value to the target.

fn compose_canonical<T: OctetsBuilder>(
    &self,
    target: &mut T
) -> Result<(), ShortBuf>

Appends the canonical representation of the value to the target.

impl Copy for Class

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 Eq for Class

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

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

Performs the conversion.

impl From<Class> for u16

fn from(value: Class) -> Self

Performs the conversion.

impl From<u16> for Class

fn from(value: u16) -> Self

Performs the conversion.

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, 

Feeds a slice of this type into the given [Hasher].

impl Ord for Class

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

This method returns an [Ordering] between self and other.

#[must_use]fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl<Ref: AsRef<[u8]>> Parse<Ref> for Class

fn parse(parser: &mut Parser<Ref>) -> Result<Self, ParseError>

Extracts a value from the beginning of parser.

fn skip(parser: &mut Parser<Ref>) -> Result<(), ParseError>

Skips over a value of this type at the beginning of parser.

impl PartialEq<Class> for Class

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

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

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<Class> for u16

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

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

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<u16> for Class

fn eq(&self, other: &u16) -> bool

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

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialOrd<Class> for Class

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

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

#[must_use]fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]fn le(&self, other: &Rhs) -> bool

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

#[must_use]fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]fn ge(&self, other: &Rhs) -> bool

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

impl PartialOrd<Class> for u16

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

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

#[must_use]fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]fn le(&self, other: &Rhs) -> bool

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

#[must_use]fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]fn ge(&self, other: &Rhs) -> bool

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

impl PartialOrd<u16> for Class

fn partial_cmp(&self, other: &u16) -> Option<Ordering>

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

#[must_use]fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]fn le(&self, other: &Rhs) -> bool

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

#[must_use]fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]fn ge(&self, other: &Rhs) -> bool

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