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

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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On 05.05.2013 07:17, Andrey Borzenkov wrote:

> В Sat, 04 May 2013 23:19:50 +0200
> Vladimir 'φ-coder/phcoder' Serbinenko <phcoder@gmail.com> пишет:
> 
>> 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);
> 
> This will crash if grub_xasprintf fails.
> 

Right, thanks. This patch was actually meant to just show the principle.
Fixed this and another problem with it, tested and now comitting.

>> +      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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