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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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2
include/grub/net.h
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@ -569,6 +569,8 @@ grub_net_add_dns_server (const struct grub_net_network_level_address *s);
void
grub_net_remove_dns_server (const struct grub_net_network_level_address *s);
grub_err_t
grub_net_search_config_file (char *config);
extern char *grub_net_default_server;