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On 04 Oct 2008 Pieter posted a dns implementation for U-Boot. http://www.mail-archive.com/u-boot-users@lists.sourceforge.net/msg10216.html > > DNS can be enabled by setting CFG_CMD_DNS. After performing a query, > the serverip environment var is updated. > > Probably there are some cosmetic issues with the patch. Unfortunatly I > do not have the time to correct these. So if anybody else likes DNS > support in U-Boot and has the time, feel free to patch it in the main tree. Here it is again - slightly modified & smaller: - update to 2009-06 (Pieter's patch was for U-Boot 1.2.0) - README.dns is added - syntax is changed (now takes a third option, the env var to store the result in) - add a random port() function in net.c - sort Makefile in ./net/Makefile - dns just returns unless a env var is given - run through checkpatch, and clean up style issues - remove packet from stack - cleaned up some comments - failure returns much faster (if server responds, don't wait for timeout) - use built in functions (memcpy) rather than byte copy. Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Pieter Voorthuijsen <pieter.voorthuijsen@prodrive.nl> Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
40 lines
974 B
C
40 lines
974 B
C
/*
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* (C) Masami Komiya <mkomiya@sonare.it> 2005
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* Copyright 2009, Robin Getz <rgetz@blackfin.uclinux.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or (at
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* your option) any later version.
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*/
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#ifndef __DNS_H__
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#define __DNS_H__
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#define DNS_SERVICE_PORT 53
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#define DNS_TIMEOUT 10000UL
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/* http://en.wikipedia.org/wiki/List_of_DNS_record_types */
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enum dns_query_type {
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DNS_A_RECORD = 0x01,
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DNS_CNAME_RECORD = 0x05,
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DNS_MX_RECORD = 0x0f,
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};
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/*
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* DNS network packet
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*/
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struct header {
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uint16_t tid; /* Transaction ID */
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uint16_t flags; /* Flags */
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uint16_t nqueries; /* Questions */
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uint16_t nanswers; /* Answers */
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uint16_t nauth; /* Authority PRs */
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uint16_t nother; /* Other PRs */
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unsigned char data[1]; /* Data, variable length */
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};
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extern void DnsStart(void); /* Begin DNS */
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#endif
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