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
36