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Add DNS support

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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>
This commit is contained in:
Robin Getz
2009-07-20 14:53:54 -04:00
committed by Ben Warren
parent 88ad3fd91c
commit 1a32bf4188
7 changed files with 401 additions and 3 deletions
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29
net/net.c
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@@ -92,6 +92,9 @@
#if defined(CONFIG_CDP_VERSION)
#include <timestamp.h>
#endif
#if defined(CONFIG_CMD_DNS)
#include "dns.h"
#endif
#if defined(CONFIG_CMD_NET)
@@ -291,6 +294,9 @@ NetInitLoop(proto_t protocol)
NetServerIP = getenv_IPaddr ("serverip");
NetOurNativeVLAN = getenv_VLAN("nvlan");
NetOurVLAN = getenv_VLAN("vlan");
#if defined(CONFIG_CMD_DNS)
NetOurDNSIP = getenv_IPaddr("dnsip");
#endif
env_changed_id = env_id;
}
@@ -425,6 +431,11 @@ restart:
case SNTP:
SntpStart();
break;
#endif
#if defined(CONFIG_CMD_DNS)
case DNS:
DnsStart();
break;
#endif
default:
break;
@@ -1518,6 +1529,14 @@ static int net_check_prereq (proto_t protocol)
}
goto common;
#endif
#if defined(CONFIG_CMD_DNS)
case DNS:
if (NetOurDNSIP == 0) {
puts("*** ERROR: DNS server address not given\n");
return 1;
}
goto common;
#endif
#if defined(CONFIG_CMD_NFS)
case NFS:
#endif
@@ -1681,6 +1700,16 @@ void copy_filename (char *dst, char *src, int size)
#endif
#if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
/*
* make port a little random, but use something trivial to compute
*/
unsigned int random_port(void)
{
return 1024 + (get_timer(0) % 0x8000);;
}
#endif
void ip_to_string (IPaddr_t x, char *s)
{
x = ntohl (x);