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normal/main: Search for specific config files for netboot

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This patch implements a search for a specific configuration when the config
file is on a remoteserver. It uses the following order:
   1) DHCP client UUID option.
   2) MAC address (in lower case hexadecimal with dash separators);
   3) IP (in upper case hexadecimal) or IPv6;
   4) The original grub.cfg file.

This procedure is similar to what is used by pxelinux and yaboot:
http://www.syslinux.org/wiki/index.php/PXELINUX#config

It is enabled by default but can be disabled by setting the environment
variable "feature_net_search_cfg" to "n" in an embedded configuration.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=873406

Signed-off-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Paulo Flabiano Smorigo 2020-01-22 12:01:55 +01:00 • committed by Daniel Kiper
parent febc761e67
commit cb2f15c544
3 changed files with 155 additions and 4 deletions
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26
grub-core/normal/main.c
View file

@ -18,6 +18,7 @@
*/
#include <grub/kernel.h>
#include <grub/net.h>
#include <grub/normal.h>
#include <grub/dl.h>
#include <grub/misc.h>
@ -323,10 +324,27 @@ grub_cmd_normal (struct grub_command *cmd __attribute__ ((unused)),
prefix = grub_env_get ("prefix");
if (prefix)
{
config = grub_xasprintf ("%s/grub.cfg", prefix);
if (! config)
goto quit;
{
grub_size_t config_len;
int disable_net_search = 0;
const char *net_search_cfg;
config_len = grub_strlen (prefix) +
sizeof ("/grub.cfg-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX");
config = grub_malloc (config_len);
if (!config)
goto quit;
grub_snprintf (config, config_len, "%s/grub.cfg", prefix);
net_search_cfg = grub_env_get ("feature_net_search_cfg");
if (net_search_cfg && net_search_cfg[0] == 'n')
disable_net_search = 1;
if (grub_strncmp (prefix + 1, "tftp", sizeof ("tftp") - 1) == 0 &&
!disable_net_search)
grub_net_search_config_file (config);
grub_enter_normal_mode (config);
grub_free (config);