1 /*
2  * (C) Masami Komiya <mkomiya@sonare.it> 2005
3  *  Copyright 2009, Robin Getz <rgetz@blackfin.uclinux.org>
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation; either version 2, or (at
8  * your option) any later version.
9  */
10 
11 #ifndef __DNS_H__
12 #define __DNS_H__
13 
14 #define DNS_SERVICE_PORT 53
15 #define DNS_TIMEOUT      10000UL
16 
17 /* http://en.wikipedia.org/wiki/List_of_DNS_record_types */
18 enum dns_query_type {
19 	DNS_A_RECORD = 0x01,
20 	DNS_CNAME_RECORD = 0x05,
21 	DNS_MX_RECORD = 0x0f,
22 };
23 
24 /*
25  * DNS network packet
26  */
27 struct header {
28 	uint16_t	tid;		/* Transaction ID */
29 	uint16_t	flags;		/* Flags */
30 	uint16_t	nqueries;	/* Questions */
31 	uint16_t	nanswers;	/* Answers */
32 	uint16_t	nauth;		/* Authority PRs */
33 	uint16_t	nother;		/* Other PRs */
34 	unsigned char	data[1];	/* Data, variable length */
35 };
36 
37 extern void DnsStart(void);		/* Begin DNS */
38 
39 #endif
40