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 <rgetz@blackfin.uclinux.org>
Signed-off-by: Pieter Voorthuijsen <pieter.voorthuijsen@prodrive.nl>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/net/net.c b/net/net.c
index e215fd8..4bbe531 100644
--- a/net/net.c
+++ b/net/net.c
@@ -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 @@
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;
}
@@ -426,6 +432,11 @@
SntpStart();
break;
#endif
+#if defined(CONFIG_CMD_DNS)
+ case DNS:
+ DnsStart();
+ break;
+#endif
default:
break;
}
@@ -1518,6 +1529,14 @@
}
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 @@
#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);