net/dns.h

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