mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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2755f37266
git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@529 36d66b0a-2a48-0410-832c-cd162a569da5
143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/*
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* devname - search for device name
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*
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* Copyright (C) 2004, Christophe Saout <christophe@saout.de>
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* Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
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* Copyright (C) 2009-2011, Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <string.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "internal.h"
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#define DEVICE_DIR "/dev"
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static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
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{
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struct dirent *entry;
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struct stat st;
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char *ptr;
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char *result = NULL;
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DIR *dir;
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int space;
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/* Ignore strange nested directories */
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if (dir_level > max_level)
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return NULL;
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path[PATH_MAX - 1] = '\0';
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ptr = path + strlen(path);
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*ptr++ = '/';
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*ptr = '\0';
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space = PATH_MAX - (ptr - path);
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dir = opendir(path);
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if (!dir)
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return NULL;
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while((entry = readdir(dir))) {
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if (entry->d_name[0] == '.' ||
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!strncmp(entry->d_name, "..", 2))
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continue;
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strncpy(ptr, entry->d_name, space);
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if (stat(path, &st) < 0)
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continue;
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if (S_ISDIR(st.st_mode)) {
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result = __lookup_dev(path, dev, dir_level + 1, max_level);
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if (result)
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break;
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} else if (S_ISBLK(st.st_mode)) {
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/* workaround: ignore dm-X devices, these are internal kernel names */
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if (dir_level == 0 && !strncmp(entry->d_name, "dm-", 3))
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continue;
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if (st.st_rdev == dev) {
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result = strdup(path);
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break;
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}
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}
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}
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closedir(dir);
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return result;
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}
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static char *lookup_dev_old(const char *dev_id)
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{
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int major, minor;
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dev_t dev;
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char *result = NULL, buf[PATH_MAX + 1];
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if (sscanf(dev_id, "%d:%d", &major, &minor) != 2)
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return NULL;
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dev = makedev(major, minor);
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strncpy(buf, DEVICE_DIR, PATH_MAX);
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buf[PATH_MAX] = '\0';
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/* First try low level device */
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if ((result = __lookup_dev(buf, dev, 0, 0)))
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return result;
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/* If it is dm, try DM dir */
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if (dm_is_dm_device(major)) {
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strncpy(buf, dm_get_dir(), PATH_MAX);
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if ((result = __lookup_dev(buf, dev, 0, 0)))
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return result;
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}
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strncpy(buf, DEVICE_DIR, PATH_MAX);
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result = __lookup_dev(buf, dev, 0, 4);
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/* If not found, return NULL */
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return result;
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}
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char *crypt_lookup_dev(const char *dev_id)
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{
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char link[PATH_MAX], path[PATH_MAX], *devname;
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struct stat st;
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ssize_t len;
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if (snprintf(path, sizeof(path), "/sys/dev/block/%s", dev_id) < 0)
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return NULL;
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len = readlink(path, link, sizeof(link));
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if (len < 0) {
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if (stat("/sys/dev/block", &st) < 0)
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return lookup_dev_old(dev_id);
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return NULL;
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}
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link[len] = '\0';
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devname = strrchr(link, '/');
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if (!devname)
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return NULL;
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devname++;
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if (!strncmp(devname, "dm-", 3))
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return dm_device_path(dev_id);
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if (snprintf(path, sizeof(path), "/dev/%s", devname) < 0)
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return NULL;
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return strdup(path);
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}
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