+++ /dev/null
-/*
- * edd_id - naming of BIOS disk devices via EDD
- *
- * Copyright (C) 2005 John Hull <John_Hull@Dell.com>
- * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
- *
- * 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, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE 1
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <ctype.h>
-#include <string.h>
-#include <errno.h>
-#include <dirent.h>
-#include <stdint.h>
-
-#include "libudev.h"
-#include "libudev-private.h"
-
-static void log_fn(struct udev *udev, int priority,
- const char *file, int line, const char *fn,
- const char *format, va_list args)
-{
- vsyslog(priority, format, args);
-}
-
-int main(int argc, char *argv[])
-{
- struct udev *udev;
- const char *node = NULL;
- int i;
- int export = 0;
- uint32_t disk_id;
- uint16_t mbr_valid;
- struct dirent *dent;
- int disk_fd;
- int sysfs_fd;
- DIR *dir = NULL;
- int rc = 1;
- char filename[UTIL_PATH_SIZE];
- char match[UTIL_PATH_SIZE];
-
- udev = udev_new();
- if (udev == NULL)
- goto exit;
-
- udev_log_init("edd_id");
- udev_set_log_fn(udev, log_fn);
-
- for (i = 1 ; i < argc; i++) {
- char *arg = argv[i];
-
- if (strcmp(arg, "--export") == 0) {
- export = 1;
- } else
- node = arg;
- }
- if (node == NULL) {
- err(udev, "no node specified\n");
- fprintf(stderr, "no node specified\n");
- goto exit;
- }
-
- /* check for kernel support */
- util_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev), "/firmware/edd", NULL);
- dir = opendir(filename);
- if (dir == NULL) {
- info(udev, "no kernel EDD support\n");
- fprintf(stderr, "no kernel EDD support\n");
- rc = 2;
- goto exit;
- }
-
- disk_fd = open(node, O_RDONLY);
- if (disk_fd < 0) {
- info(udev, "unable to open '%s'\n", node);
- fprintf(stderr, "unable to open '%s'\n", node);
- rc = 3;
- goto closedir;
- }
-
- /* check for valid MBR signature */
- if (lseek(disk_fd, 510, SEEK_SET) < 0) {
- info(udev, "seek to MBR validity failed '%s'\n", node);
- rc = 4;
- goto close;
- }
- if (read(disk_fd, &mbr_valid, sizeof(mbr_valid)) != sizeof(mbr_valid)) {
- info(udev, "read MBR validity failed '%s'\n", node);
- rc = 5;
- goto close;
- }
- if (mbr_valid != 0xAA55) {
- fprintf(stderr, "no valid MBR signature '%s'\n", node);
- info(udev, "no valid MBR signature '%s'\n", node);
- rc=6;
- goto close;
- }
-
- /* read EDD signature */
- if (lseek(disk_fd, 440, SEEK_SET) < 0) {
- info(udev, "seek to signature failed '%s'\n", node);
- rc = 7;
- goto close;
- }
- if (read(disk_fd, &disk_id, sizeof(disk_id)) != sizeof(disk_id)) {
- info(udev, "read signature failed '%s'\n", node);
- rc = 8;
- goto close;
- }
- /* all zero is invalid */
- info(udev, "read id 0x%08x from '%s'\n", disk_id, node);
- if (disk_id == 0) {
- fprintf(stderr, "no EDD signature '%s'\n", node);
- info(udev, "'%s' signature is zero\n", node);
- rc = 9;
- goto close;
- }
-
- /* lookup signature in sysfs to determine the name */
- match[0] = '\0';
- for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- char sysfs_id_buf[256];
- uint32_t sysfs_id;
- ssize_t size;
-
- if (dent->d_name[0] == '.')
- continue;
-
- util_strscpyl(filename, sizeof(filename), dent->d_name, "/mbr_signature", NULL);
- sysfs_fd = openat(dirfd(dir), filename, O_RDONLY);
- if (sysfs_fd < 0) {
- info(udev, "unable to open sysfs '%s'\n", filename);
- continue;
- }
-
- size = read(sysfs_fd, sysfs_id_buf, sizeof(sysfs_id_buf)-1);
- close(sysfs_fd);
- if (size <= 0) {
- info(udev, "read sysfs '%s' failed\n", filename);
- continue;
- }
- sysfs_id_buf[size] = '\0';
- info(udev, "read '%s' from '%s'\n", sysfs_id_buf, filename);
- sysfs_id = strtoul(sysfs_id_buf, NULL, 16);
-
- /* look for matching value, that appears only once */
- if (disk_id == sysfs_id) {
- if (match[0] == '\0') {
- /* store id */
- util_strscpy(match, sizeof(match), dent->d_name);
- } else {
- /* error, same signature for another device */
- info(udev, "'%s' does not have a unique signature\n", node);
- fprintf(stderr, "'%s' does not have a unique signature\n", node);
- rc = 10;
- goto exit;
- }
- }
- }
-
- if (match[0] != '\0') {
- if (export)
- printf("ID_EDD=%s\n", match);
- else
- printf("%s\n", match);
- rc = 0;
- }
-
-close:
- close(disk_fd);
-closedir:
- closedir(dir);
-exit:
- udev_unref(udev);
- udev_log_close();
- return rc;
-}
projects / systemd / commitdiff