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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