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efivars_sysfs.c

/*
  efivars_sysfs.[ch] - Manipulates EFI variables as exported in /sys/firmware/efi/vars

  Copyright (C) 2001,2003 Dell Computer Corporation <Matt_Domsch@dell.com>

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#define _FILE_OFFSET_BITS 64

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <fcntl.h>

#include "efi.h"
#include "efichar.h"
#include "efibootmgr.h"
#include "efivars_sysfs.h"

static efi_status_t
sysfs_read_variable(const char *name, efi_variable_t *var)
{
      char filename[PATH_MAX];
      int fd;
      size_t readsize;
      char buffer[PATH_MAX+40];
      if (!name || !var) return EFI_INVALID_PARAMETER;
      memset(buffer, 0, sizeof(buffer));

      snprintf(filename, PATH_MAX-1, "%s/%s/raw_var", SYSFS_DIR_EFI_VARS,name);
      fd = open(filename, O_RDONLY);
      if (fd == -1) {
            return EFI_NOT_FOUND;
      }
      readsize = read(fd, var, sizeof(*var));
      if (readsize != sizeof(*var)) {
            close(fd);
            return EFI_INVALID_PARAMETER;
      }
      close(fd);
      return var->Status;
}

static efi_status_t
sysfs_write_variable(const char *filename, efi_variable_t *var)
{
      int fd;
      size_t writesize;
      char buffer[PATH_MAX+40];

      if (!filename || !var) return EFI_INVALID_PARAMETER;
      memset(buffer, 0, sizeof(buffer));

      fd = open(filename, O_WRONLY);
      if (fd == -1) {
            return EFI_INVALID_PARAMETER;
      }
      writesize = write(fd, var, sizeof(*var));
      if (writesize != sizeof(*var)) {
            close(fd);
            return EFI_INVALID_PARAMETER;
      }
      close(fd);
      return EFI_SUCCESS;
}


static efi_status_t
sysfs_edit_variable(const char *name, efi_variable_t *var)
{
      char filename[PATH_MAX];
      if (!var) return EFI_INVALID_PARAMETER;
      snprintf(filename, PATH_MAX-1, "%s/%s/raw_var", SYSFS_DIR_EFI_VARS,name);
      return sysfs_write_variable(filename, var);
}

static efi_status_t
sysfs_create_variable(efi_variable_t *var)
{
      char filename[PATH_MAX];
      if (!var) return EFI_INVALID_PARAMETER;
      snprintf(filename, PATH_MAX-1, "%s/%s", SYSFS_DIR_EFI_VARS,"new_var");
      return sysfs_write_variable(filename, var);
}

static efi_status_t
sysfs_delete_variable(efi_variable_t *var)
{
      char filename[PATH_MAX];
      if (!var) return EFI_INVALID_PARAMETER;
      snprintf(filename, PATH_MAX-1, "%s/%s", SYSFS_DIR_EFI_VARS,"del_var");
      return sysfs_write_variable(filename, var);
}

struct efivar_kernel_calls sysfs_kernel_calls = {
      .read = sysfs_read_variable,
      .edit = sysfs_edit_variable,
      .create = sysfs_create_variable,
      .delete = sysfs_delete_variable,
      .path = SYSFS_DIR_EFI_VARS,
};

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