Re: Obtaining the MAC address of the boot NIC for a PXE boot

[Vladimir 'φ-coder/phcoder' Serbinenko]

Patch for net_default_*. Please test.

=== modified file 'grub-core/net/bootp.c'
--- grub-core/net/bootp.c       2013-01-20 13:24:47 +0000
+++ grub-core/net/bootp.c       2013-05-04 21:16:02 +0000
@@ -211,6 +211,9 @@
       grub_print_error ();
     }
 
+  if (is_def)
+    grub_env_set ("net_default_interface", name);
+
   if (device && !*device && bp->server_ip)
     {
       *device = grub_xasprintf ("tftp,%d.%d.%d.%d",

=== modified file 'grub-core/net/net.c'
--- grub-core/net/net.c 2013-01-21 01:33:46 +0000
+++ grub-core/net/net.c 2013-05-04 21:13:29 +0000
@@ -1,6 +1,6 @@
 /*
  *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 2010,2011  Free Software Foundation, Inc.
+ *  Copyright (C) 2010,2011,2012,2013  Free Software Foundation, Inc.
  *
  *  GRUB is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -813,6 +813,65 @@
   return grub_net_default_server ? : "";
 }
 
+static const char *
+defip_get_env (struct grub_env_var *var __attribute__ ((unused)),
+              const char *val)
+{
+  const char *intf = grub_env_get ("net_default_interface");
+  const char *ret = NULL;
+  if (intf)
+    {
+      char *buf = grub_xasprintf ("net_%s_ip", intf);
+      ret = grub_env_get (buf);
+      grub_free (buf);
+    }
+  return ret;
+}
+
+static char *
+defip_set_env (struct grub_env_var *var __attribute__ ((unused)),
+              const char *val)
+{
+  const char *intf = grub_env_get ("net_default_interface");
+  if (intf)
+    {
+      char *buf = grub_xasprintf ("net_%s_ip", intf);
+      grub_env_set (buf, val);
+      grub_free (buf);
+    }
+  return NULL;
+}
+
+
+static const char *
+defmac_get_env (struct grub_env_var *var __attribute__ ((unused)),
+              const char *val)
+{
+  const char *intf = grub_env_get ("net_default_interface");
+  const char *ret = NULL;
+  if (intf)
+    {
+      char *buf = grub_xasprintf ("net_%s_mac", intf);
+      ret = grub_env_get (buf);
+      grub_free (buf);
+    }
+  return ret;
+}
+
+static char *
+defmac_set_env (struct grub_env_var *var __attribute__ ((unused)),
+              const char *val)
+{
+  const char *intf = grub_env_get ("net_default_interface");
+  if (intf)
+    {
+      char *buf = grub_xasprintf ("net_%s_mac", intf);
+      grub_env_set (buf, val);
+      grub_free (buf);
+    }
+  return NULL;
+}
+
 
 static void
 grub_net_network_level_interface_register (struct 
grub_net_network_level_interface *inter)
@@ -1560,6 +1619,10 @@
                               defserver_set_env);
   grub_register_variable_hook ("pxe_default_server", defserver_get_env,
                               defserver_set_env);
+  grub_register_variable_hook ("net_default_ip", defip_get_env,
+                              defip_set_env);
+  grub_register_variable_hook ("net_default_mac", defmac_get_env,
+                              defmac_set_env);
 
   cmd_addaddr = grub_register_command ("net_add_addr", grub_cmd_addaddr,
                                        /* TRANSLATORS: HWADDRESS stands for

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