Struct OptHeader

pub struct OptHeader { /* private fields */ }

The header of an OPT record.

The OPT record reappropriates the record header for encoding some basic information. This type provides access to this information. It consists of the record header with the exception of the final rdlen field.

This is so that OptBuilder can safely deref to this type.

Implementations

impl OptHeader

pub fn for_record_slice(slice: &[u8]) -> &OptHeader

Returns a reference to an OPT header pointing into a record’s octets.

pub fn for_record_slice_mut(slice: &mut [u8]) -> &mut OptHeader

Returns a mutable reference pointing into a record’s octets.

pub fn udp_payload_size(&self) -> u16

Returns the UDP payload size.

Through this field a sender of a message can signal the maximum size of UDP payload the sender is able to handle when receiving messages. This value refers to the abilities of the sender’s DNS implementation, not such things as network MTUs. Which means that the largest UDP payload that can actually be sent back to the sender may be smaller.

pub fn set_udp_payload_size(&mut self, value: u16)

Sets the UDP payload size value.

pub fn rcode(&self, header: Header) -> OptRcode

Returns the extended rcode.

Some of the bits of the rcode are stored in the regular message header. Such a header needs to be passed to the method.

pub fn set_rcode(&mut self, rcode: OptRcode)

Sets the extend rcode of the OPT header.

This method only sets the upper bits of the rcode. The lower bits need to be set in the message header.

pub fn version(&self) -> u8

Returns the EDNS version of the OPT header.

Only EDNS version 0 is currently defined.

pub fn set_version(&mut self, version: u8)

Sets the EDNS version of the OPT header.

pub fn dnssec_ok(&self) -> bool

Returns the value of the DNSSEC OK (DO) bit.

By setting this bit, a resolver indicates that it is interested in also receiving the DNSSEC-related resource records necessary to validate an answer. The bit and the related procedures are defined in RFC 3225.

pub fn set_dnssec_ok(&mut self, value: bool)

Sets the DNSSEC OK (DO) bit to the given value.

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

Trait Implementations

impl Clone for OptHeader

fn clone(&self) -> OptHeader

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for OptHeader

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

Formats the value using the given formatter.

impl Default for OptHeader

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for OptHeader

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

impl Eq for OptHeader

impl StructuralPartialEq for OptHeader