contrib/cryptsetup/lib/libdevmapper.c

   1 #include <machine/inttypes.h>
   2 #include <sys/ioctl.h>
   3 #include <sys/param.h>
   4 #include <sys/stat.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include <stdlib.h>
   8 #include <dirent.h>
   9 #include <errno.h>
  10 #include <libdm.h>
  11 #include <fcntl.h>
  12 #include <uuid.h>
  13
  14 #include "internal.h"
  15 #include "luks.h"
  16
  17 #define DEVICE_DIR              "/dev"
  18 #define DM_UUID_LEN             129
  19 #define DM_UUID_PREFIX          "CRYPT-"
  20 #define DM_UUID_PREFIX_LEN      6
  21 #define DM_CRYPT_TARGET         "crypt"
  22 #define RETRY_COUNT             5
  23
  24 /* Set if dm-crypt version was probed */
  25 static int _dm_crypt_checked = 0;
  26 static int _dm_crypt_wipe_key_supported = 0;
  27
  28 static int _dm_use_count = 0;
  29 static struct crypt_device *_context = NULL;
  30
  31 /* Compatibility for old device-mapper without udev support */
  32 #ifndef HAVE_DM_TASK_SET_COOKIE
  33 #define CRYPT_TEMP_UDEV_FLAGS   0
  34 #else
  35 #define CRYPT_TEMP_UDEV_FLAGS   DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG | \
  36                                 DM_UDEV_DISABLE_DISK_RULES_FLAG | \
  37                                 DM_UDEV_DISABLE_OTHER_RULES_FLAG
  38 #endif
  39
  40 static int _dm_use_udev()
  41 {
  42 #ifdef USE_UDEV /* cannot be enabled if devmapper is too old */
  43         return dm_udev_get_sync_support();
  44 #else
  45         return 0;
  46 #endif
  47 }
  48
  49 static void set_dm_error(int level, const char *file, int line,
  50                          const char *f, ...)
  51 {
  52         char *msg = NULL;
  53         va_list va;
  54
  55         va_start(va, f);
  56         if (vasprintf(&msg, f, va) > 0) {
  57                 if (level < 4) {
  58                         log_err(_context, msg);
  59                         log_err(_context, "\n");
  60                 } else
  61                         log_dbg(msg);
  62         }
  63         free(msg);
  64         va_end(va);
  65 }
  66
  67 static int _dm_simple(int task, const char *name, int udev_wait);
  68
  69 static void _dm_set_crypt_compat(int maj, int min, int patch)
  70 {
  71         log_dbg("Detected dm-crypt target of version %i.%i.%i.", maj, min, patch);
  72
  73         if (maj >= 1 && min >=2)
  74                 _dm_crypt_wipe_key_supported = 1;
  75         else
  76                 log_dbg("Suspend and resume disabled, no wipe key support.");
  77
  78         _dm_crypt_checked = 1;
  79 }
  80
  81 static int _dm_check_versions(void)
  82 {
  83         struct dm_task *dmt;
  84         struct dm_versions *target, *last_target;
  85
  86         if (_dm_crypt_checked)
  87                 return 1;
  88
  89         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
  90                 return 0;
  91
  92         if (!dm_task_run(dmt)) {
  93                 dm_task_destroy(dmt);
  94                 return 0;
  95         }
  96
  97         target = dm_task_get_versions(dmt);
  98         do {
  99                 last_target = target;
 100                 if (!strcmp(DM_CRYPT_TARGET, target->name)) {
 101                         _dm_set_crypt_compat((int)target->version[0],
 102                                              (int)target->version[1],
 103                                              (int)target->version[2]);
 104                 }
 105                 target = (void *) target + target->next;
 106         } while (last_target != target);
 107
 108         dm_task_destroy(dmt);
 109         return 1;
 110 }
 111
 112 int dm_init(struct crypt_device *context, int check_kernel)
 113 {
 114         if (!_dm_use_count++) {
 115                 log_dbg("Initialising device-mapper backend%s, UDEV is %sabled.",
 116                         check_kernel ? "" : " (NO kernel check requested)",
 117                         _dm_use_udev() ? "en" : "dis");
 118                 if (check_kernel && !_dm_check_versions()) {
 119                         log_err(context, _("Cannot initialize device-mapper. Is dm kernel module loaded?\n"));
 120                         return -1;
 121                 }
 122                 if (getuid() || geteuid())
 123                         log_dbg(("WARNING: Running as a non-root user. Functionality may be unavailable."));
 124                 dm_log_init(set_dm_error);
 125                 dm_log_init_verbose(10);
 126         }
 127
 128         // FIXME: global context is not safe
 129         if (context)
 130                 _context = context;
 131
 132         return 1;       /* unsafe memory */
 133 }
 134
 135 void dm_exit(void)
 136 {
 137         if (_dm_use_count && (!--_dm_use_count)) {
 138                 log_dbg("Releasing device-mapper backend.");
 139                 dm_log_init_verbose(0);
 140                 dm_log_init(NULL);
 141                 dm_lib_release();
 142                 _context = NULL;
 143         }
 144 }
 145
 146 static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
 147 {
 148         struct dirent *entry;
 149         struct stat st;
 150         char *ptr;
 151         char *result = NULL;
 152         DIR *dir;
 153         int space;
 154
 155         /* Ignore strange nested directories */
 156         if (dir_level > max_level)
 157                 return NULL;
 158
 159         path[PATH_MAX - 1] = '\0';
 160         ptr = path + strlen(path);
 161         *ptr++ = '/';
 162         *ptr = '\0';
 163         space = PATH_MAX - (ptr - path);
 164
 165         dir = opendir(path);
 166         if (!dir)
 167                 return NULL;
 168
 169         while((entry = readdir(dir))) {
 170                 if (entry->d_name[0] == '.' ||
 171                     !strncmp(entry->d_name, "..", 2))
 172                         continue;
 173
 174                 strncpy(ptr, entry->d_name, space);
 175                 if (stat(path, &st) < 0)
 176                         continue;
 177
 178                 if (S_ISDIR(st.st_mode)) {
 179                         result = __lookup_dev(path, dev, dir_level + 1, max_level);
 180                         if (result)
 181                                 break;
 182                 } else if (S_ISBLK(st.st_mode)) {
 183                         /* workaround: ignore dm-X devices, these are internal kernel names */
 184                         if (dir_level == 0 && !strncmp(entry->d_name, "dm-", 3))
 185                                 continue;
 186                         if (st.st_rdev == dev) {
 187                                 result = strdup(path);
 188                                 break;
 189                         }
 190                 }
 191         }
 192
 193         closedir(dir);
 194         return result;
 195 }
 196
 197 static char *lookup_dev(const char *dev_id)
 198 {
 199         uint32_t major, minor;
 200         dev_t dev;
 201         char *result = NULL, buf[PATH_MAX + 1];
 202
 203         if (sscanf(dev_id, "%" PRIu32 ":%" PRIu32, &major, &minor) != 2)
 204                 return NULL;
 205
 206         dev = makedev(major, minor);
 207         strncpy(buf, DEVICE_DIR, PATH_MAX);
 208         buf[PATH_MAX] = '\0';
 209
 210         /* First try low level device */
 211         if ((result = __lookup_dev(buf, dev, 0, 0)))
 212                 return result;
 213
 214         /* If it is dm, try DM dir  */
 215         if (dm_is_dm_major(major)) {
 216                 strncpy(buf, dm_dir(), PATH_MAX);
 217                 if ((result = __lookup_dev(buf, dev, 0, 0)))
 218                         return result;
 219         }
 220
 221         strncpy(buf, DEVICE_DIR, PATH_MAX);
 222         result = __lookup_dev(buf, dev, 0, 4);
 223
 224         /* If not found, return NULL */
 225         return result;
 226 }
 227
 228 static int _dev_read_ahead(const char *dev, uint32_t *read_ahead)
 229 {
 230         int fd, r = 0;
 231         long read_ahead_long;
 232
 233         if ((fd = open(dev, O_RDONLY)) < 0)
 234                 return 0;
 235
 236         r = 0;
 237         //r = ioctl(fd, BLKRAGET, &read_ahead_long) ? 0 : 1;
 238         close(fd);
 239
 240         if (r)
 241                 *read_ahead = (uint32_t) read_ahead_long;
 242
 243         return r;
 244 }
 245
 246 static void hex_key(char *hexkey, size_t key_size, const char *key)
 247 {
 248         int i;
 249
 250         for(i = 0; i < key_size; i++)
 251                 sprintf(&hexkey[i * 2], "%02x", (unsigned char)key[i]);
 252 }
 253
 254 static char *get_params(const char *device, uint64_t skip, uint64_t offset,
 255                         const char *cipher, size_t key_size, const char *key)
 256 {
 257         char *params;
 258         char *hexkey;
 259
 260         hexkey = safe_alloc(key_size * 2 + 1);
 261         if (!hexkey)
 262                 return NULL;
 263
 264         hex_key(hexkey, key_size, key);
 265
 266         params = safe_alloc(strlen(hexkey) + strlen(cipher) + strlen(device) + 64);
 267         if (!params)
 268                 goto out;
 269
 270         sprintf(params, "%s %s %" PRIu64 " %s %" PRIu64,
 271                 cipher, hexkey, skip, device, offset);
 272
 273 out:
 274         safe_free(hexkey);
 275         return params;
 276 }
 277
 278 /* DM helpers */
 279 static int _dm_simple(int task, const char *name, int udev_wait)
 280 {
 281         int r = 0;
 282         struct dm_task *dmt;
 283         uint32_t cookie = 0;
 284
 285         if (!_dm_use_udev())
 286                 udev_wait = 0;
 287
 288         if (!(dmt = dm_task_create(task)))
 289                 return 0;
 290
 291         if (name && !dm_task_set_name(dmt, name))
 292                 goto out;
 293
 294         if (udev_wait && !dm_task_set_cookie(dmt, &cookie, 0))
 295                 goto out;
 296
 297         r = dm_task_run(dmt);
 298
 299         if (udev_wait)
 300                 (void)dm_udev_wait(cookie);
 301
 302       out:
 303         dm_task_destroy(dmt);
 304         return r;
 305 }
 306
 307 static int _error_device(const char *name, size_t size)
 308 {
 309         struct dm_task *dmt;
 310         int r = 0;
 311
 312         if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
 313                 return 0;
 314
 315         if (!dm_task_set_name(dmt, name))
 316                 goto error;
 317
 318         if (!dm_task_add_target(dmt, UINT64_C(0), size, "error", ""))
 319                 goto error;
 320
 321         if (!dm_task_set_ro(dmt))
 322                 goto error;
 323
 324         if (!dm_task_no_open_count(dmt))
 325                 goto error;
 326
 327         if (!dm_task_run(dmt))
 328                 goto error;
 329
 330         if (!_dm_simple(DM_DEVICE_RESUME, name, 1)) {
 331                 _dm_simple(DM_DEVICE_CLEAR, name, 0);
 332                 goto error;
 333         }
 334
 335         r = 1;
 336
 337 error:
 338         dm_task_destroy(dmt);
 339         return r;
 340 }
 341
 342 int dm_remove_device(const char *name, int force, uint64_t size)
 343 {
 344         int r = -EINVAL;
 345         int retries = force ? RETRY_COUNT : 1;
 346         int error_target = 0;
 347
 348         if (!name || (force && !size))
 349                 return -EINVAL;
 350
 351         do {
 352                 r = _dm_simple(DM_DEVICE_REMOVE, name, 1) ? 0 : -EINVAL;
 353                 if (--retries && r) {
 354                         log_dbg("WARNING: other process locked internal device %s, %s.",
 355                                 name, retries ? "retrying remove" : "giving up");
 356                         if (force && (crypt_get_debug_level() == CRYPT_LOG_DEBUG))
 357                                 debug_processes_using_device(name);
 358                         sleep(1);
 359                         if (force && !error_target) {
 360                                 /* If force flag is set, replace device with error, read-only target.
 361                                  * it should stop processes from reading it and also removed underlying
 362                                  * device from mapping, so it is usable again.
 363                                  * Force flag should be used only for temporary devices, which are
 364                                  * intended to work inside cryptsetup only!
 365                                  * Anyway, if some process try to read temporary cryptsetup device,
 366                                  * it is bug - no other process should try touch it (e.g. udev).
 367                                  */
 368                                 _error_device(name, size);
 369                                 error_target = 1;
 370                         }
 371                 }
 372         } while (r == -EINVAL && retries);
 373
 374         dm_task_update_nodes();
 375
 376         return r;
 377 }
 378
 379 #define UUID_LEN 37 /* 36 + \0, libuuid ... */
 380 /*
 381  * UUID has format: CRYPT-<devicetype>-[<uuid>-]<device name>
 382  * CRYPT-PLAIN-name
 383  * CRYPT-LUKS1-00000000000000000000000000000000-name
 384  * CRYPT-TEMP-name
 385  */
 386 static void dm_prepare_uuid(const char *name, const char *type, const char *uuid, char *buf, size_t buflen)
 387 {
 388         char *ptr, uuid2[UUID_LEN] = {0};
 389         uuid_t uu;
 390         int i = 0;
 391         uint32_t ret;
 392
 393         /* Remove '-' chars */
 394         if (uuid) {
 395                 uuid_from_string(uuid, &uu, &ret);
 396                 if (ret != uuid_s_ok) {
 397                         printf("error in uuid_from_string(%s), err = %d\n", uuid, ret);
 398                         for (ptr = uuid2, i = 0; i < UUID_LEN; i++) {
 399                                 if (uuid[i] != '-') {
 400                                         *ptr = uuid[i];
 401                                         ptr++;
 402                                 }
 403                         }
 404                 }
 405         }
 406
 407         i = snprintf(buf, buflen, DM_UUID_PREFIX "%s%s%s%s%s",
 408                 type ?: "", type ? "-" : "",
 409                 uuid2[0] ? uuid2 : "", uuid2[0] ? "-" : "",
 410                 name);
 411
 412         log_dbg("DM-UUID is %s", buf);
 413         if (i >= buflen)
 414                 log_err(NULL, _("DM-UUID for device %s was truncated.\n"), name);
 415 }
 416
 417 int dm_create_device(const char *name,
 418                      const char *device,
 419                      const char *cipher,
 420                      const char *type,
 421                      const char *uuid,
 422                      uint64_t size,
 423                      uint64_t skip,
 424                      uint64_t offset,
 425                      size_t key_size,
 426                      const char *key,
 427                      int read_only,
 428                      int reload)
 429 {
 430         struct dm_task *dmt = NULL;
 431         struct dm_info dmi;
 432         char *params = NULL;
 433         char *error = NULL;
 434         char dev_uuid[DM_UUID_LEN] = {0};
 435         int r = -EINVAL;
 436         uint32_t read_ahead = 0;
 437         uint32_t cookie = 0;
 438         uint16_t udev_flags = 0;
 439
 440         params = get_params(device, skip, offset, cipher, key_size, key);
 441         if (!params)
 442                 goto out_no_removal;
 443
 444         if (type && !strncmp(type, "TEMP", 4))
 445                 udev_flags = CRYPT_TEMP_UDEV_FLAGS;
 446
 447         /* All devices must have DM_UUID, only resize on old device is exception */
 448         if (reload) {
 449                 if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
 450                         goto out_no_removal;
 451
 452                 if (!dm_task_set_name(dmt, name))
 453                         goto out_no_removal;
 454         } else {
 455                 dm_prepare_uuid(name, type, uuid, dev_uuid, sizeof(dev_uuid));
 456
 457                 if (!(dmt = dm_task_create(DM_DEVICE_CREATE)))
 458                         goto out_no_removal;
 459
 460                 if (!dm_task_set_name(dmt, name))
 461                         goto out_no_removal;
 462
 463                 if (!dm_task_set_uuid(dmt, dev_uuid))
 464                         goto out_no_removal;
 465
 466                 if (_dm_use_udev() && !dm_task_set_cookie(dmt, &cookie, udev_flags))
 467                         goto out_no_removal;
 468         }
 469
 470         if (read_only && !dm_task_set_ro(dmt))
 471                 goto out_no_removal;
 472         if (!dm_task_add_target(dmt, 0, size, DM_CRYPT_TARGET, params))
 473                 goto out_no_removal;
 474
 475 #ifdef DM_READ_AHEAD_MINIMUM_FLAG
 476         if (_dev_read_ahead(device, &read_ahead) &&
 477             !dm_task_set_read_ahead(dmt, read_ahead, DM_READ_AHEAD_MINIMUM_FLAG))
 478                 goto out_no_removal;
 479 #endif
 480
 481         if (!dm_task_run(dmt))
 482                 goto out_no_removal;
 483
 484         if (reload) {
 485                 dm_task_destroy(dmt);
 486                 if (!(dmt = dm_task_create(DM_DEVICE_RESUME)))
 487                         goto out;
 488                 if (!dm_task_set_name(dmt, name))
 489                         goto out;
 490                 if (uuid && !dm_task_set_uuid(dmt, dev_uuid))
 491                         goto out;
 492                 if (_dm_use_udev() && !dm_task_set_cookie(dmt, &cookie, udev_flags))
 493                         goto out;
 494                 if (!dm_task_run(dmt))
 495                         goto out;
 496         }
 497
 498         if (!dm_task_get_info(dmt, &dmi))
 499                 goto out;
 500
 501         r = 0;
 502 out:
 503         if (_dm_use_udev()) {
 504                 (void)dm_udev_wait(cookie);
 505                 cookie = 0;
 506         }
 507
 508         if (r < 0 && !reload) {
 509                 if (get_error())
 510                         error = strdup(get_error());
 511
 512                 dm_remove_device(name, 0, 0);
 513
 514                 if (error) {
 515                         set_error(error);
 516                         free(error);
 517                 }
 518         }
 519
 520 out_no_removal:
 521         if (cookie && _dm_use_udev())
 522                 (void)dm_udev_wait(cookie);
 523
 524         if (params)
 525                 safe_free(params);
 526         if (dmt)
 527                 dm_task_destroy(dmt);
 528
 529         dm_task_update_nodes();
 530         return r;
 531 }
 532
 533 int dm_status_device(const char *name)
 534 {
 535         struct dm_task *dmt;
 536         struct dm_info dmi;
 537         uint64_t start, length;
 538         char *target_type, *params;
 539         void *next = NULL;
 540         int r = -EINVAL;
 541
 542         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 543                 return -EINVAL;
 544
 545         if (!dm_task_set_name(dmt, name)) {
 546                 r = -EINVAL;
 547                 goto out;
 548         }
 549
 550         if (!dm_task_run(dmt)) {
 551                 r = -EINVAL;
 552                 goto out;
 553         }
 554
 555         if (!dm_task_get_info(dmt, &dmi)) {
 556                 r = -EINVAL;
 557                 goto out;
 558         }
 559
 560         if (!dmi.exists) {
 561                 r = -ENODEV;
 562                 goto out;
 563         }
 564
 565         next = dm_get_next_target(dmt, next, &start, &length,
 566                                   &target_type, &params);
 567         if (!target_type || strcmp(target_type, DM_CRYPT_TARGET) != 0 ||
 568             start != 0 || next)
 569                 r = -EINVAL;
 570         else
 571                 r = (dmi.open_count > 0);
 572 out:
 573         if (dmt)
 574                 dm_task_destroy(dmt);
 575
 576         return r;
 577 }
 578
 579 int dm_query_device(const char *name,
 580                     char **device,
 581                     uint64_t *size,
 582                     uint64_t *skip,
 583                     uint64_t *offset,
 584                     char **cipher,
 585                     int *key_size,
 586                     char **key,
 587                     int *read_only,
 588                     int *suspended,
 589                     char **uuid)
 590 {
 591         struct dm_task *dmt;
 592         struct dm_info dmi;
 593         uint64_t start, length, val64;
 594         char *target_type, *params, *rcipher, *key_, *rdevice, *endp, buffer[3], *tmp_uuid;
 595         void *next = NULL;
 596         int i, r = -EINVAL;
 597
 598         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 599                 goto out;
 600         if (!dm_task_set_name(dmt, name))
 601                 goto out;
 602         r = -ENODEV;
 603         if (!dm_task_run(dmt))
 604                 goto out;
 605
 606         r = -EINVAL;
 607         if (!dm_task_get_info(dmt, &dmi))
 608                 goto out;
 609
 610         if (!dmi.exists) {
 611                 r = -ENODEV;
 612                 goto out;
 613         }
 614
 615         next = dm_get_next_target(dmt, next, &start, &length,
 616                                   &target_type, &params);
 617         if (!target_type || strcmp(target_type, DM_CRYPT_TARGET) != 0 ||
 618             start != 0 || next)
 619                 goto out;
 620
 621         if (size)
 622                 *size = length;
 623
 624         rcipher = strsep(&params, " ");
 625         /* cipher */
 626         if (cipher)
 627                 *cipher = strdup(rcipher);
 628
 629         /* skip */
 630         key_ = strsep(&params, " ");
 631         if (!params)
 632                 goto out;
 633         val64 = strtoull(params, &params, 10);
 634         if (*params != ' ')
 635                 goto out;
 636         params++;
 637         if (skip)
 638                 *skip = val64;
 639
 640         /* device */
 641         rdevice = strsep(&params, " ");
 642         if (device)
 643                 *device = lookup_dev(rdevice);
 644
 645         /*offset */
 646         if (!params)
 647                 goto out;
 648         val64 = strtoull(params, &params, 10);
 649         if (*params)
 650                 goto out;
 651         if (offset)
 652                 *offset = val64;
 653
 654         /* key_size */
 655         if (key_size)
 656                 *key_size = strlen(key_) / 2;
 657
 658         /* key */
 659         if (key_size && key) {
 660                 *key = safe_alloc(*key_size);
 661                 if (!*key) {
 662                         r = -ENOMEM;
 663                         goto out;
 664                 }
 665
 666                 buffer[2] = '\0';
 667                 for(i = 0; i < *key_size; i++) {
 668                         memcpy(buffer, &key_[i * 2], 2);
 669                         (*key)[i] = strtoul(buffer, &endp, 16);
 670                         if (endp != &buffer[2]) {
 671                                 safe_free(key);
 672                                 *key = NULL;
 673                                 goto out;
 674                         }
 675                 }
 676         }
 677         memset(key_, 0, strlen(key_));
 678
 679         if (read_only)
 680                 *read_only = dmi.read_only;
 681
 682         if (suspended)
 683                 *suspended = dmi.suspended;
 684
 685         if (uuid && (tmp_uuid = (char*)dm_task_get_uuid(dmt)) &&
 686             !strncmp(tmp_uuid, DM_UUID_PREFIX, DM_UUID_PREFIX_LEN))
 687                 *uuid = strdup(tmp_uuid + DM_UUID_PREFIX_LEN);
 688
 689         r = (dmi.open_count > 0);
 690 out:
 691         if (dmt)
 692                 dm_task_destroy(dmt);
 693
 694         return r;
 695 }
 696
 697 static int _dm_message(const char *name, const char *msg)
 698 {
 699         int r = 0;
 700         struct dm_task *dmt;
 701
 702         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 703                 return 0;
 704
 705         if (name && !dm_task_set_name(dmt, name))
 706                 goto out;
 707
 708         if (!dm_task_set_sector(dmt, (uint64_t) 0))
 709                 goto out;
 710
 711         if (!dm_task_set_message(dmt, msg))
 712                 goto out;
 713
 714         r = dm_task_run(dmt);
 715
 716       out:
 717         dm_task_destroy(dmt);
 718         return r;
 719 }
 720
 721 int dm_suspend_and_wipe_key(const char *name)
 722 {
 723         if (!_dm_check_versions())
 724                 return -ENOTSUP;
 725
 726         if (!_dm_crypt_wipe_key_supported)
 727                 return -ENOTSUP;
 728
 729         if (!_dm_simple(DM_DEVICE_SUSPEND, name, 0))
 730                 return -EINVAL;
 731
 732         if (!_dm_message(name, "key wipe")) {
 733                 _dm_simple(DM_DEVICE_RESUME, name, 1);
 734                 return -EINVAL;
 735         }
 736
 737         return 0;
 738 }
 739
 740 int dm_resume_and_reinstate_key(const char *name,
 741                                 size_t key_size,
 742                                 const char *key)
 743 {
 744         int msg_size = key_size * 2 + 10; // key set <key>
 745         char *msg;
 746         int r = 0;
 747
 748         if (!_dm_check_versions())
 749                 return -ENOTSUP;
 750
 751         if (!_dm_crypt_wipe_key_supported)
 752                 return -ENOTSUP;
 753
 754         msg = safe_alloc(msg_size);
 755         if (!msg)
 756                 return -ENOMEM;
 757
 758         memset(msg, 0, msg_size);
 759         strcpy(msg, "key set ");
 760         hex_key(&msg[8], key_size, key);
 761
 762         if (!_dm_message(name, msg) ||
 763             !_dm_simple(DM_DEVICE_RESUME, name, 1))
 764                 r = -EINVAL;
 765
 766         safe_free(msg);
 767         return r;
 768 }
 769
 770 const char *dm_get_dir(void)
 771 {
 772         return dm_dir();
 773 }