#include <sdns.h>

Public Attributes
uint16_t	id
	RFC1035: 16-bit identifier.

uint8_t	qr:1
	RFC1035: one bit if the msg is query(0) or response(1)

uint8_t	opcode:4
	RFC1035: 4-bit specifies the kind of query in the message.

uint8_t	aa:1
	RFC1035: 1-bit if this is an authoritative answer.

uint8_t	tc:1
	RFC1035: 1-bit TrunCation.

uint8_t	rd:1
	RFC1035: Recursion Desired.

uint8_t	ra:1
	RFC1035: Recursion Available.

uint8_t	z:1
	RFC1035: Reserved for future use.

uint8_t	AD:1
	RFC2535: Section 6.1: authentic data.

uint8_t	CD:1
	RFC2535: Section 6.1: checking disabled.

uint8_t	rcode:4
	RFC1035: Response code.

uint16_t	qdcount
	RFC1035: Number of entries in question section.

uint16_t	ancount
	RFC1035: Number of entries in answer section.

uint16_t	nscount
	RFC1035: Number of entries in authority section.

uint16_t	arcount
	RFC1035: Number of entries in additional section.

Detailed Description

Structure of the DNS packet header based on RFC1035 Section 4.1.1

                                    1  1  1  1  1  1
    0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  |                      ID                       |
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  |QR|   Opcode  |AA|TC|RD|RA|Z |AD|CD|   RCODE   |
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  |                    QDCOUNT                    |
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  |                    ANCOUNT                    |
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  |                    NSCOUNT                    |
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  |                    ARCOUNT                    |
  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

The header is exactly 12 bytes and it's always the same.

Although QDCOUNT can be > 1 but most DNS resolvers return FormError if QDCOUNT > 1

The documentation for this struct was generated from the following file:

include/sdns.h

Public Attributes

Detailed Description