+/*
+ efivars_procfs.[ch] - Manipulates EFI variables as exported in /proc/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_procfs.h"
+
+static efi_status_t
+procfs_read_variable(const char *name, efi_variable_t *var)
+{
+ char filename[PATH_MAX];
+ int fd;
+ size_t readsize;
+ if (!name || !var) return EFI_INVALID_PARAMETER;
+
+ snprintf(filename, PATH_MAX-1, "%s/%s", PROCFS_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;
+}
+
+/**
+ * select_variable_names()
+ * @d - dirent to compare against
+ *
+ * This ignores "." and ".." entries, and selects all others.
+ */
+
+static int
+select_variable_names(const struct dirent *d)
+{
+ if (!strcmp(d->d_name, ".") ||
+ !strcmp(d->d_name, ".."))
+ return 0;
+ return 1;
+}
+
+/**
+ * find_write_victim()
+ * @var - variable to be written
+ * @file - name of file to open for writing @var is returned.
+ *
+ * This ignores "." and ".." entries, and selects all others.
+ */
+static char *
+find_write_victim(efi_variable_t *var, char file[PATH_MAX])
+{
+ struct dirent **namelist = NULL;
+ int i, n, found=0;
+ char testname[PATH_MAX], *p;
+
+ memset(testname, 0, sizeof(testname));
+ n = scandir(PROCFS_DIR_EFI_VARS, &namelist,
+ select_variable_names, alphasort);
+ if (n < 0)
+ return NULL;
+
+ p = testname;
+ efichar_to_char(p, var->VariableName, PATH_MAX);
+ p += strlen(p);
+ p += sprintf(p, "-");
+ efi_guid_unparse(&var->VendorGuid, p);
+
+ for (i=0; i<n; i++) {
+ if (namelist[i] &&
+ strncmp(testname, namelist[i]->d_name, sizeof(testname))) {
+ found++;
+ sprintf(file, "%s/%s", PROCFS_DIR_EFI_VARS,
+ namelist[i]->d_name);
+ break;
+ }
+ }
+
+ while (n--) {
+ if (namelist[n]) {
+ free(namelist[n]);
+ namelist[n] = NULL;
+ }
+ }
+ free(namelist);
+
+ if (!found) return NULL;
+ return file;
+}
+
+
+static efi_status_t
+procfs_write_variable(efi_variable_t *var)
+{
+ int fd;
+ size_t writesize;
+ char buffer[PATH_MAX], name[PATH_MAX], *p = NULL;
+
+ if (!var) return EFI_INVALID_PARAMETER;
+ memset(buffer, 0, sizeof(buffer));
+ memset(name, 0, sizeof(name));
+
+ p = find_write_victim(var, name);
+ if (!p) return EFI_INVALID_PARAMETER;
+
+ fd = open(name, O_WRONLY);
+ if (fd == -1) {
+ sprintf(buffer, "write_variable():open(%s)", name);
+ perror(buffer);
+ 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
+procfs_delete_variable(efi_variable_t *var)
+{
+ if (!var) return EFI_INVALID_PARAMETER;
+ var->DataSize = 0;
+ var->Attributes = 0;
+ return procfs_write_variable(var);
+
+}
+
+static efi_status_t
+procfs_edit_variable(const char *unused, efi_variable_t *var)
+{
+ if (!var) return EFI_INVALID_PARAMETER;
+ return procfs_write_variable(var);
+
+}
+
+struct efivar_kernel_calls procfs_kernel_calls = {
+ .read = procfs_read_variable,
+ .edit = procfs_edit_variable,
+ .create = procfs_write_variable,
+ .delete = procfs_delete_variable,
+ .path = PROCFS_DIR_EFI_VARS,
+};