/* virt-efivars editor.
 * Copyright (C) 2015 Red Hat Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <config.h>

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>

#include <efivar.h>

#define GUID_FORMAT "%08x-%04x-%04x-%04x-%02x%02x%02x%02x%02x%02x"

static void
list_variables (void)
{
  efi_guid_t *guid = NULL;
  char *name = NULL;
  int r;

  while ((r = efi_get_next_variable_name (&guid, &name)) > 0)
    printf (GUID_FORMAT "-%s\n",
            guid->a, guid->b, guid->c, bswap_16 (guid->d),
            guid->e[0], guid->e[1], guid->e[2], guid->e[3],
            guid->e[4], guid->e[5], name);

  if (r < 0) {
    perror ("efi_get_next_variable_name");
    exit (EXIT_FAILURE);
  }
}

static void
add_variable (void)
{
  uint8_t data[] = "rwmjtestdata";

  if (efi_set_variable (efi_guid_redhat, "RWMJTest",
                        data, sizeof data,
                        EFI_VARIABLE_BOOTSERVICE_ACCESS |
                        EFI_VARIABLE_RUNTIME_ACCESS |
                        EFI_VARIABLE_NON_VOLATILE) < 0) {
    perror ("efi_set_variable");
    exit (EXIT_FAILURE);
  }
}

int
main (int argc, char *argv[])
{
  printf ("*** editor running ***\n");

  if (!efi_variables_supported ()) {
    fprintf (stderr, "UEFI variables are not supported!\n");
    exit (EXIT_FAILURE);
  }

  list_variables ();

  add_variable ();

  printf ("*** editor finished ***\n");
  exit (EXIT_SUCCESS);
}