Struct DnsLayer 

pub struct DnsLayer {
    pub index: LayerIndex,
}

DNS layer — a zero-copy view into the packet buffer.

Provides lazy field access for all DNS header fields and on-demand parsing of question/RR sections.

Fields

index: LayerIndex

Implementations

impl DnsLayer

pub fn new(start: usize, end: usize) -> Self

Create a new DnsLayer from start/end offsets.

pub fn id(&self, buf: &[u8]) -> Result<u16, FieldError>

Transaction ID.

pub fn qr(&self, buf: &[u8]) -> Result<bool, FieldError>

QR flag: false=query, true=response.

pub fn opcode(&self, buf: &[u8]) -> Result<u8, FieldError>

Operation code (4 bits).

pub fn aa(&self, buf: &[u8]) -> Result<bool, FieldError>

Authoritative Answer flag.

pub fn tc(&self, buf: &[u8]) -> Result<bool, FieldError>

Truncation flag.

pub fn rd(&self, buf: &[u8]) -> Result<bool, FieldError>

Recursion Desired flag.

pub fn ra(&self, buf: &[u8]) -> Result<bool, FieldError>

Recursion Available flag.

pub fn z(&self, buf: &[u8]) -> Result<bool, FieldError>

Reserved flag (Z).

pub fn ad(&self, buf: &[u8]) -> Result<bool, FieldError>

Authenticated Data flag (DNSSEC).

pub fn cd(&self, buf: &[u8]) -> Result<bool, FieldError>

Checking Disabled flag (DNSSEC).

pub fn rcode(&self, buf: &[u8]) -> Result<u8, FieldError>

Response code (4 bits).

pub fn qdcount(&self, buf: &[u8]) -> Result<u16, FieldError>

Question count.

pub fn ancount(&self, buf: &[u8]) -> Result<u16, FieldError>

Answer count.

pub fn nscount(&self, buf: &[u8]) -> Result<u16, FieldError>

Authority count.

pub fn arcount(&self, buf: &[u8]) -> Result<u16, FieldError>

Additional count.

pub fn questions(&self, buf: &[u8]) -> Result<Vec<DnsQuestion>, FieldError>

Parse all questions from the packet.

pub fn answers_rr( &self, buf: &[u8], ) -> Result<Vec<DnsResourceRecord>, FieldError>

Parse all answer RRs from the packet.

pub fn authorities( &self, buf: &[u8], ) -> Result<Vec<DnsResourceRecord>, FieldError>

Parse all authority RRs from the packet.

pub fn additionals( &self, buf: &[u8], ) -> Result<Vec<DnsResourceRecord>, FieldError>

Parse all additional RRs from the packet.

pub fn parse_all( &self, buf: &[u8], ) -> Result<(Vec<DnsQuestion>, Vec<DnsResourceRecord>, Vec<DnsResourceRecord>, Vec<DnsResourceRecord>), FieldError>

Parse all sections at once.

pub fn get_field( &self, buf: &[u8], name: &str, ) -> Option<Result<FieldValue, FieldError>>

Get a field value by name.

pub fn set_field( &self, buf: &mut [u8], name: &str, value: FieldValue, ) -> Option<Result<(), FieldError>>

Set a field value by name.

pub fn field_names() -> &'static [&'static str]

Get the list of field names.

Trait Implementations

impl Clone for DnsLayer

fn clone(&self) -> DnsLayer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DnsLayer

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

Formats the value using the given formatter.

impl Layer for DnsLayer

fn kind(&self) -> LayerKind

Get the kind of this layer

fn summary(&self, buf: &[u8]) -> String

Get a human-readable summary of this layer

fn header_len(&self, buf: &[u8]) -> usize

Get the header length for this layer

fn hashret(&self, buf: &[u8]) -> Vec<u8>

Compute a hash for packet matching.

fn field_names(&self) -> &'static [&'static str]

Get the list of field names for this layer

fn answers(&self, _data: &[u8], _other: &Self, _other_data: &[u8]) -> bool

Check if this packet answers another packet.

fn extract_padding<'a>(&self, data: &'a [u8]) -> (&'a [u8], &'a [u8])

Extract padding from the packet.