From 1a32bf41881b5dbe3119cb77a33572b4d462cabf Mon Sep 17 00:00:00 2001 From: Robin Getz Date: Mon, 20 Jul 2009 14:53:54 -0400 Subject: Add DNS support 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 Signed-off-by: Pieter Voorthuijsen Signed-off-by: Ben Warren --- net/dns.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 net/dns.h (limited to 'net/dns.h') diff --git a/net/dns.h b/net/dns.h new file mode 100644 index 0000000000..277c093ed3 --- /dev/null +++ b/net/dns.h @@ -0,0 +1,39 @@ +/* + * (C) Masami Komiya 2005 + * Copyright 2009, Robin Getz + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2, or (at + * your option) any later version. + */ + +#ifndef __DNS_H__ +#define __DNS_H__ + +#define DNS_SERVICE_PORT 53 +#define DNS_TIMEOUT 10000UL + +/* http://en.wikipedia.org/wiki/List_of_DNS_record_types */ +enum dns_query_type { + DNS_A_RECORD = 0x01, + DNS_CNAME_RECORD = 0x05, + DNS_MX_RECORD = 0x0f, +}; + +/* + * DNS network packet + */ +struct header { + uint16_t tid; /* Transaction ID */ + uint16_t flags; /* Flags */ + uint16_t nqueries; /* Questions */ + uint16_t nanswers; /* Answers */ + uint16_t nauth; /* Authority PRs */ + uint16_t nother; /* Other PRs */ + unsigned char data[1]; /* Data, variable length */ +}; + +extern void DnsStart(void); /* Begin DNS */ + +#endif -- cgit v1.2.1