Enum ProtocolMode

pub enum ProtocolMode {
    OnlyV4,
    PreferV4,
    PreferV6,
    OnlyV6,
}

How the recursive resolver should choose which IP address to try for upstream nameservers.

Variants

OnlyV4

Only use IPv4 (e.g. this is an IPv4-only network), rejecting a nameserver if it is only available over IPv6.

PreferV4

If a nameserver is only available over IPv6, use that; but if it is available over both IPv4 and IPv6 (or only IPv4), use the IPv4 address.

PreferV6

If a nameserver is only available over IPv4, use that; but if it is available over both IPv4 and IPv6 (or only IPv6), use the IPv6 address.

OnlyV6

Only use IPv6 (e.g. this is an IPv6-only network), rejecting a nameserver if it is only available over IPv4.

Trait Implementations

impl Clone for ProtocolMode

fn clone(&self) -> ProtocolMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ProtocolMode

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

Formats the value using the given formatter.

impl Display for ProtocolMode

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

Formats the value using the given formatter.

impl FromStr for ProtocolMode

type Err = &'static str

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 ProtocolMode

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 ProtocolMode

fn cmp(&self, other: &ProtocolMode) -> 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 ProtocolMode

fn eq(&self, other: &ProtocolMode) -> 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 ProtocolMode

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

impl Eq for ProtocolMode

impl StructuralPartialEq for ProtocolMode