Struct simple_dns::PacketHeader

pub struct PacketHeader {

    pub id: u16,
    pub query: bool,
    pub opcode: OPCODE,
    pub authoritative_answer: bool,
    pub truncated: bool,
    pub recursion_desired: bool,
    pub recursion_available: bool,
    pub response_code: RCODE,
    pub questions_count: u16,
    pub answers_count: u16,
    pub name_servers_count: u16,
    pub additional_records_count: u16,
    pub authentic_data: bool,
    pub checking_disabled: bool,
}

Contains general information about the packet

Fields

id: u16

The identification of the packet, must be defined when querying

query: bool

Indicates if this packet is a query or a response.

opcode: OPCODE

Indicates the type of query in this packet

authoritative_answer: bool

Authoritative Answer - this bit is valid in responses,
and specifies that the responding name server is an authority for the domain name in question section.

truncated: bool

TrunCation - specifies that this message was truncated due to
length greater than that permitted on the transmission channel.

recursion_desired: bool

Recursion Desired may be set in a query andis copied into the response.
If RD is set, it directs the name server to pursue the query recursively.
Recursive query support is optional.

recursion_available: bool

Recursion Available is set or cleared in a response.
It denotes whether recursive query support is available in the name server.

response_code: RCODE

RCODE indicates the response code for this packet

questions_count: u16

Indicate the number of questions in the packet

answers_count: u16

Indicate the number of answers in the packet

name_servers_count: u16

Indicate the number of name servers resource records in the packet

additional_records_count: u16

Indicate the number of additional records in the packet

authentic_data: bool

checking_disabled: bool

Implementations

impl PacketHeader

pub fn new_query(id: u16, recursion_desired: bool) -> Self

Creates a new header for a query packet

pub fn new_reply(id: u16, opcode: OPCODE) -> Self

Creates a new header for a reply packet

pub fn parse(data: &[u8]) -> Result<Self>

Parse a slice of 12 bytes into a Packet header

pub fn write_to(&self, buffer: &mut [u8])

Writes this header to a buffer of 12 bytes

pub fn id(buffer: &[u8]) -> u16

Returns the packet id from the header buffer

pub fn read_questions(buffer: &[u8]) -> u16

Returns the questions count from the header buffer

pub fn write_questions(buffer: &mut [u8], question_count: u16)

Writes the questions count in the header buffer

pub fn read_answers(buffer: &[u8]) -> u16

Returns the answers count from the header buffer

pub fn write_answers(buffer: &mut [u8], answers_count: u16)

Writes the answers count in the header buffer

pub fn read_name_servers(buffer: &[u8]) -> u16

Returns the name servers count from the header buffer

pub fn write_name_servers(buffer: &mut [u8], name_servers_count: u16)

Writes the name servers count in the header buffer

pub fn read_additional_records(buffer: &[u8]) -> u16

Returns the additional records from the header buffer

pub fn write_additional_records(
    buffer: &mut [u8],
    additional_records_count: u16
)

Writes the additional records count in the header buffer

Trait Implementations

impl Debug for PacketHeader

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

Formats the value using the given formatter.