/*
* Linux block devices helpers
*
- * Copyright (C) 2018-2021 Red Hat, Inc. All rights reserved.
- * Copyright (C) 2018-2021 Ondrej Kozina
+ * Copyright (C) 2018-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2018-2023 Ondrej Kozina
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
#endif
#include <uuid/uuid.h>
-#define DM_UUID_LEN 129
-#define DM_BY_ID_PREFIX "dm-uuid-"
-#define DM_BY_ID_PREFIX_LEN 8
-#define DM_UUID_PREFIX "CRYPT-"
-#define DM_UUID_PREFIX_LEN 6
#define UUID_LEN 37 /* 36 + \0, libuuid ... */
static int dm_prepare_uuid(const char *type, const char *uuid, char *buf, size_t buflen)
}
}
- snprintf(buf, buflen, DM_UUID_PREFIX "%s%s%s%s",
- type ?: "", type ? "-" : "",
- uuid2[0] ? uuid2 : "", uuid2[0] ? "-" : "");
+ if (snprintf(buf, buflen, DM_UUID_PREFIX "%s%s%s%s",
+ type ?: "", type ? "-" : "",
+ uuid2[0] ? uuid2 : "", uuid2[0] ? "-" : "") < 0)
+ return 0;
return 1;
}
/* return number of holders in general, if matched dm_uuid prefix it's returned via dm_name */
/* negative value is error */
-static int lookup_holder_dm_name(const char *dm_uuid, size_t max_len, dev_t devno, char *dm_name, size_t dm_name_length)
+static int lookup_holder_dm_name(const char *dm_uuid, dev_t devno, char **r_dm_name)
{
struct dirent *entry;
- char dm_subpath[PATH_MAX], data_dev_dir[PATH_MAX], uuid[max_len];
+ char dm_subpath[PATH_MAX], data_dev_dir[PATH_MAX], uuid[DM_UUID_LEN], dm_name[PATH_MAX] = {};
ssize_t s;
struct stat st;
int dmfd, fd, len, r = 0; /* not found */
DIR *dir;
- if (!dm_name || !dm_name_length)
+ if (!r_dm_name)
return -EINVAL;
- *dm_name = '\0';
-
len = snprintf(data_dev_dir, PATH_MAX, "/sys/dev/block/%u:%u/holders", major(devno), minor(devno));
if (len < 0 || len >= PATH_MAX)
return -EINVAL;
}
/* reads binary data */
- s = read_buffer(fd, uuid, max_len - 1);
+ s = read_buffer(fd, uuid, sizeof(uuid) - 1);
close(fd);
uuid[s > 0 ? s : 0] = '\0';
if (!strncmp(uuid, dm_uuid, strlen(dm_uuid)))
}
/* reads binary data */
- s = read_buffer(fd, dm_name, dm_name_length - 1);
+ s = read_buffer(fd, dm_name, sizeof(dm_name));
close(fd);
close(dmfd);
if (s > 1) {
dm_name[s-1] = '\0';
log_dbg("Found dm device %s", dm_name);
+ if (!(*r_dm_name = strdup(dm_name)))
+ return -ENOMEM;
}
}
}
int tools_lookup_crypt_device(struct crypt_device *cd, const char *type,
- const char *data_device_path, char *name, size_t name_length)
+ const char *data_device_path, char **r_name)
{
- int r;
char *c;
struct stat st;
char dev_uuid[DM_UUID_LEN + DM_BY_ID_PREFIX_LEN] = DM_BY_ID_PREFIX;
if (!S_ISBLK(st.st_mode))
return -ENOTBLK;
- r = lookup_holder_dm_name(dev_uuid + DM_BY_ID_PREFIX_LEN, DM_UUID_LEN,
- st.st_rdev, name, name_length);
+ return lookup_holder_dm_name(dev_uuid + DM_BY_ID_PREFIX_LEN, st.st_rdev, r_name);
+}
+
+static void report_partition(const char *value, const char *device, bool batch_mode)
+{
+ if (batch_mode)
+ log_dbg("Device %s already contains a '%s' partition signature.", device, value);
+ else
+ log_std(_("WARNING: Device %s already contains a '%s' partition signature.\n"), device, value);
+}
+
+static void report_superblock(const char *value, const char *device, bool batch_mode)
+{
+ if (batch_mode)
+ log_dbg("Device %s already contains a '%s' superblock signature.", device, value);
+ else
+ log_std(_("WARNING: Device %s already contains a '%s' superblock signature.\n"), device, value);
+}
+
+int tools_detect_signatures(const char *device, tools_probe_filter_info filter,
+ size_t *count,bool batch_mode)
+{
+ int r;
+ size_t tmp_count;
+ struct blkid_handle *h;
+ blk_probe_status pr;
+
+ if (!count)
+ count = &tmp_count;
+
+ *count = 0;
+
+ if (!blk_supported()) {
+ log_dbg("Blkid support disabled.");
+ return 0;
+ }
+
+ if ((r = blk_init_by_path(&h, device))) {
+ log_err(_("Failed to initialize device signature probes."));
+ return -EINVAL;
+ }
+
+ switch (filter) {
+ case PRB_FILTER_LUKS:
+ if (blk_superblocks_filter_luks(h)) {
+ r = -EINVAL;
+ goto out;
+ }
+ /* fall-through */
+ case PRB_FILTER_NONE:
+ blk_set_chains_for_full_print(h);
+ break;
+ case PRB_ONLY_LUKS:
+ blk_set_chains_for_fast_detection(h);
+ if (blk_superblocks_only_luks(h)) {
+ r = -EINVAL;
+ goto out;
+ }
+ }
+
+ while ((pr = blk_probe(h)) < PRB_EMPTY) {
+ if (blk_is_partition(h))
+ report_partition(blk_get_partition_type(h), device, batch_mode);
+ else if (blk_is_superblock(h))
+ report_superblock(blk_get_superblock_type(h), device, batch_mode);
+ else {
+ log_dbg("Internal tools_detect_signatures() error.");
+ r = -EINVAL;
+ goto out;
+ }
+ (*count)++;
+ }
+
+ if (pr == PRB_FAIL)
+ r = -EINVAL;
+out:
+ blk_free(h);
return r;
}
+
+int tools_wipe_all_signatures(const char *path, bool exclusive, bool only_luks)
+{
+ int fd, flags, r;
+ blk_probe_status pr;
+ struct stat st;
+ struct blkid_handle *h = NULL;
+
+ if (!blk_supported()) {
+ log_dbg("Blkid support disabled.");
+ return 0;
+ }
+
+ if (stat(path, &st)) {
+ log_err(_("Failed to stat device %s."), path);
+ return -EINVAL;
+ }
+
+ flags = O_RDWR;
+ if (S_ISBLK(st.st_mode) && exclusive)
+ flags |= O_EXCL;
+
+ /* better than opening regular file with O_EXCL (undefined) */
+ /* coverity[toctou] */
+ fd = open(path, flags); /* lgtm[cpp/toctou-race-condition] */
+ if (fd < 0) {
+ if (errno == EBUSY)
+ log_err(_("Cannot exclusively open %s, device in use."), path);
+ else
+ log_err(_("Failed to open file %s in read/write mode."), path);
+ return -EINVAL;
+ }
+
+ if ((r = blk_init_by_fd(&h, fd))) {
+ log_err(_("Failed to initialize device signature probes."));
+ r = -EINVAL;
+ goto out;
+ }
+
+ blk_set_chains_for_wipes(h);
+ if (only_luks && (r = blk_superblocks_only_luks(h))) {
+ r = -EINVAL;
+ goto out;
+ }
+
+ while ((pr = blk_probe(h)) < PRB_EMPTY) {
+ if (blk_is_partition(h))
+ log_verbose(_("Existing '%s' partition signature on device %s will be wiped."),
+ blk_get_partition_type(h), path);
+ if (blk_is_superblock(h))
+ log_verbose(_("Existing '%s' superblock signature on device %s will be wiped."),
+ blk_get_superblock_type(h), path);
+ if (blk_do_wipe(h) || fsync(fd)) {
+ log_err(_("Failed to wipe device signature."));
+ r = -EINVAL;
+ goto out;
+ }
+ }
+
+ if (pr != PRB_EMPTY) {
+ log_err(_("Failed to probe device %s for a signature."), path);
+ r = -EINVAL;
+ }
+out:
+ close(fd);
+ blk_free(h);
+ return r;
+}
+
+int tools_superblock_block_size(const char *device, char *sb_name, size_t sb_name_len, unsigned *r_block_size)
+{
+ struct blkid_handle *h;
+ const char *name;
+ int r = 0;
+
+ if (!r_block_size || !sb_name || sb_name_len < 1)
+ return -EINVAL;
+
+ if (!blk_supported()) {
+ log_dbg("Blkid support disabled.");
+ return 0;
+ }
+
+ if ((r = blk_init_by_path(&h, device))) {
+ log_err(_("Failed to initialize device signature probes."));
+ return -EINVAL;
+ }
+
+ blk_set_chains_for_superblocks(h);
+
+ switch (blk_probe(h)) {
+ case PRB_OK:
+ *r_block_size = blk_get_block_size(h);
+ if (!*r_block_size) /* same as not-found */
+ break;
+
+ if (!(name = blk_get_superblock_type(h))) {
+ r = -EINVAL;
+ break;
+ }
+
+ /* we don't mind truncating */
+ strncpy(sb_name, name, sb_name_len - 1);
+ sb_name[sb_name_len-1] = '\0';
+
+ log_dbg("Detected superblock %s on device %s (block size: %u).", sb_name, device, *r_block_size);
+ r = 1;
+ /* fall-through */
+ case PRB_EMPTY:
+ break;
+ default:
+ r = -EINVAL;
+ }
+
+ blk_free(h);
+
+ return r;
+}
+
+bool tools_blkid_supported(void)
+{
+ return blk_supported() != 0;
+}
projects / platform / upstream / cryptsetup.git / blobdiff