X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=lib%2Futils_devpath.c;h=b6c8975dbd08c9e3f78a2ab982f71e81c3fedb73;hb=322b430a2589cdc7985e98a14ec12322b91c9d5e;hp=963785a3c94f185aafe926eb9a40eb9601680469;hpb=ad21d48762fa70838d4ab4fbe8fe2a2e8a4dcef1;p=platform%2Fupstream%2Fcryptsetup.git

diff --git a/lib/utils_devpath.c b/lib/utils_devpath.c
index 963785a..b6c8975 100644
--- a/lib/utils_devpath.c
+++ b/lib/utils_devpath.c
@@ -1,10 +1,10 @@
 /*
  * devname - search for device name
  *
- * Copyright (C) 2004, Jana Saout <jana@saout.de>
- * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
- * Copyright (C) 2009-2013, Milan Broz
+ * Copyright (C) 2004 Jana Saout <jana@saout.de>
+ * Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
+ * Copyright (C) 2009-2020 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2020 Milan Broz
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -26,11 +26,13 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <dirent.h>
-#include <fcntl.h>
 #include <errno.h>
 #include <limits.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#ifdef HAVE_SYS_SYSMACROS_H
+# include <sys/sysmacros.h>     /* for major, minor */
+#endif
 #include "internal.h"
 
 static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
@@ -108,7 +110,7 @@ static char *lookup_dev_old(int major, int minor)
 		return result;
 
 	/* If it is dm, try DM dir  */
-	if (dm_is_dm_device(major, minor)) {
+	if (dm_is_dm_device(major)) {
 		strncpy(buf, dm_get_dir(), PATH_MAX);
 		if ((result = __lookup_dev(buf, dev, 0, 0)))
 			return result;
@@ -276,24 +278,30 @@ char *crypt_get_partition_device(const char *dev_path, uint64_t offset, uint64_t
 		major(st.st_rdev), minor(st.st_rdev)) < 0)
 		return NULL;
 
+	dir = opendir(path);
+	if (!dir)
+		return NULL;
+
 	len = readlink(path, link, sizeof(link) - 1);
-	if (len < 0)
+	if (len < 0) {
+		closedir(dir);
 		return NULL;
+	}
 
 	/* Get top level disk name for sysfs search */
 	link[len] = '\0';
 	devname = strrchr(link, '/');
-	if (!devname)
+	if (!devname) {
+		closedir(dir);
 		return NULL;
+	}
 	devname++;
 
 	/* DM devices do not use kernel partitions. */
-	if (dm_is_dm_kernel_name(devname))
-		return NULL;
-
-	dir = opendir(path);
-	if (!dir)
+	if (dm_is_dm_kernel_name(devname)) {
+		closedir(dir);
 		return NULL;
+	}
 
 	devname_len = strlen(devname);
 	while((entry = readdir(dir))) {
@@ -362,3 +370,88 @@ char *crypt_get_base_device(const char *dev_path)
 	snprintf(part_path, sizeof(part_path), "/dev/%s", devname);
 	return strdup(part_path);
 }
+
+int lookup_by_disk_id(const char *dm_uuid)
+{
+	struct dirent *entry;
+	struct stat st;
+	int r = 0; /* not found */
+	DIR *dir = opendir("/dev/disk/by-id");
+
+	if (!dir)
+		/* map ENOTDIR to ENOENT we'll handle both errors same */
+		return errno == ENOTDIR ? -ENOENT : -errno;
+
+	while ((entry = readdir(dir))) {
+		if (entry->d_name[0] == '.' ||
+		    !strncmp(entry->d_name, "..", 2))
+			continue;
+
+		if (fstatat(dirfd(dir), entry->d_name, &st, AT_SYMLINK_NOFOLLOW)) {
+			r = -EINVAL;
+			break;
+		}
+
+		if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
+			continue;
+
+		if (!strncmp(entry->d_name, dm_uuid, strlen(dm_uuid))) {
+			r = 1;
+			break;
+		}
+	}
+
+	closedir(dir);
+
+	return r;
+}
+
+int lookup_by_sysfs_uuid_field(const char *dm_uuid, size_t max_len)
+{
+	struct dirent *entry;
+	char subpath[PATH_MAX], uuid[max_len];
+	ssize_t s;
+	struct stat st;
+	int fd, len, r = 0; /* not found */
+	DIR *dir = opendir("/sys/block/");
+
+	if (!dir)
+		/* map ENOTDIR to ENOENT we'll handle both errors same */
+		return errno == ENOTDIR ? -ENOENT : -errno;
+
+	while (r != 1 && (entry = readdir(dir))) {
+		if (entry->d_name[0] == '.' ||
+		    !strncmp(entry->d_name, "..", 2))
+			continue;
+
+		len = snprintf(subpath, PATH_MAX, "%s/%s", entry->d_name, "dm/uuid");
+		if (len < 0 || len >= PATH_MAX) {
+			r = -EINVAL;
+			break;
+		}
+
+		/* looking for dm-X/dm/uuid file, symlinks are fine */
+		fd = openat(dirfd(dir), subpath, O_RDONLY | O_CLOEXEC);
+		if (fd < 0)
+			continue;
+
+		if (fstat(fd, &st) || !S_ISREG(st.st_mode)) {
+			close(fd);
+			continue;
+		}
+
+		/* reads binary data */
+		s = read_buffer(fd, uuid, max_len - 1);
+		if (s > 0) {
+			uuid[s] = '\0';
+			if (!strncmp(uuid, dm_uuid, strlen(dm_uuid)))
+				r = 1;
+		}
+
+		close(fd);
+	}
+
+	closedir(dir);
+
+	return r;
+}