net/dns.h

   1 /*
   2  * (C) Masami Komiya <mkomiya@sonare.it> 2005
   3  *  Copyright 2009, Robin Getz <rgetz@blackfin.uclinux.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef __DNS_H__
   9 #define __DNS_H__
  10
  11 #define DNS_SERVICE_PORT 53
  12 #define DNS_TIMEOUT      10000UL
  13
  14 /* http://en.wikipedia.org/wiki/List_of_DNS_record_types */
  15 enum dns_query_type {
  16         DNS_A_RECORD = 0x01,
  17         DNS_CNAME_RECORD = 0x05,
  18         DNS_MX_RECORD = 0x0f,
  19 };
  20
  21 /*
  22  * DNS network packet
  23  */
  24 struct header {
  25         uint16_t        tid;            /* Transaction ID */
  26         uint16_t        flags;          /* Flags */
  27         uint16_t        nqueries;       /* Questions */
  28         uint16_t        nanswers;       /* Answers */
  29         uint16_t        nauth;          /* Authority PRs */
  30         uint16_t        nother;         /* Other PRs */
  31         unsigned char   data[1];        /* Data, variable length */
  32 };
  33
  34 void dns_start(void);           /* Begin DNS */
  35
  36 #endif