src/veritysetup.c

   1 /*
   2  * veritysetup - setup cryptographic volumes for dm-verity
   3  *
   4  * Copyright (C) 2012-2021 Red Hat, Inc. All rights reserved.
   5  * Copyright (C) 2012-2021 Milan Broz
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "cryptsetup.h"
  23
  24 #define PACKAGE_VERITY "veritysetup"
  25
  26 static char *opt_fec_device = NULL;
  27 static char *opt_hash_algorithm = NULL;
  28 static char *opt_salt = NULL;
  29 static char *opt_uuid = NULL;
  30 static char *opt_root_hash_signature = NULL;
  31
  32 static int opt_use_superblock = 1;
  33 static int opt_fec_roots = DEFAULT_VERITY_FEC_ROOTS;
  34 static int opt_hash_type = 1;
  35 static int opt_data_block_size = DEFAULT_VERITY_DATA_BLOCK;
  36 static int opt_hash_block_size = DEFAULT_VERITY_HASH_BLOCK;
  37 static uint64_t data_blocks = 0;
  38 static uint64_t hash_offset = 0;
  39 static uint64_t fec_offset = 0;
  40 static int opt_restart_on_corruption = 0;
  41 static int opt_panic_on_corruption = 0;
  42 static int opt_ignore_corruption = 0;
  43 static int opt_ignore_zero_blocks = 0;
  44 static int opt_check_at_most_once = 0;
  45
  46 static const char **action_argv;
  47 static int action_argc;
  48
  49 void tools_cleanup(void)
  50 {
  51         FREE_AND_NULL(opt_fec_device);
  52         FREE_AND_NULL(opt_hash_algorithm);
  53         FREE_AND_NULL(opt_salt);
  54         FREE_AND_NULL(opt_uuid);
  55         FREE_AND_NULL(opt_root_hash_signature);
  56 }
  57
  58 static int _prepare_format(struct crypt_params_verity *params,
  59                            const char *data_device,
  60                            uint32_t flags)
  61 {
  62         char *salt = NULL;
  63         int len;
  64
  65         params->hash_name = opt_hash_algorithm ?: DEFAULT_VERITY_HASH;
  66         params->data_device = data_device;
  67         params->fec_device = opt_fec_device;
  68         params->fec_roots = opt_fec_roots;
  69
  70         if (opt_salt && !strcmp(opt_salt, "-")) {
  71                 params->salt_size = 0;
  72                 params->salt = NULL;
  73         } else if (opt_salt) {
  74                 len = crypt_hex_to_bytes(opt_salt, &salt, 0);
  75                 if (len < 0) {
  76                         log_err(_("Invalid salt string specified."));
  77                         return -EINVAL;
  78                 }
  79                 params->salt_size = len;
  80                 params->salt = salt;
  81         } else {
  82                 params->salt_size = DEFAULT_VERITY_SALT_SIZE;
  83                 params->salt = NULL;
  84         }
  85
  86         params->data_block_size = opt_data_block_size;
  87         params->hash_block_size = opt_hash_block_size;
  88         params->data_size = data_blocks;
  89         params->hash_area_offset = hash_offset;
  90         params->fec_area_offset = fec_offset;
  91         params->hash_type = opt_hash_type;
  92         params->flags = flags;
  93
  94         return 0;
  95 }
  96
  97 static int action_format(int arg)
  98 {
  99         struct crypt_device *cd = NULL;
 100         struct crypt_params_verity params = {};
 101         uint32_t flags = CRYPT_VERITY_CREATE_HASH;
 102         int r;
 103
 104         /* Try to create hash image if doesn't exist */
 105         r = open(action_argv[1], O_WRONLY | O_EXCL | O_CREAT, S_IRUSR | S_IWUSR);
 106         if (r < 0 && errno != EEXIST) {
 107                 log_err(_("Cannot create hash image %s for writing."), action_argv[1]);
 108                 return -EINVAL;
 109         } else if (r >= 0) {
 110                 log_dbg("Created hash image %s.", action_argv[1]);
 111                 close(r);
 112         }
 113         /* Try to create FEC image if doesn't exist */
 114         if (opt_fec_device) {
 115                 r = open(opt_fec_device, O_WRONLY | O_EXCL | O_CREAT, S_IRUSR | S_IWUSR);
 116                 if (r < 0 && errno != EEXIST) {
 117                         log_err(_("Cannot create FEC image %s for writing."), opt_fec_device);
 118                         return -EINVAL;
 119                 } else if (r >= 0) {
 120                         log_dbg("Created FEC image %s.", opt_fec_device);
 121                         close(r);
 122                 }
 123         }
 124
 125         if ((r = crypt_init(&cd, action_argv[1])))
 126                 goto out;
 127
 128         if (!opt_use_superblock)
 129                 flags |= CRYPT_VERITY_NO_HEADER;
 130
 131         r = _prepare_format(&params, action_argv[0], flags);
 132         if (r < 0)
 133                 goto out;
 134
 135         r = crypt_format(cd, CRYPT_VERITY, NULL, NULL, opt_uuid, NULL, 0, &params);
 136         if (!r)
 137                 crypt_dump(cd);
 138 out:
 139         crypt_free(cd);
 140         free(CONST_CAST(char*)params.salt);
 141         return r;
 142 }
 143
 144 static int _activate(const char *dm_device,
 145                       const char *data_device,
 146                       const char *hash_device,
 147                       const char *root_hash,
 148                       uint32_t flags)
 149 {
 150         struct crypt_device *cd = NULL;
 151         struct crypt_params_verity params = {};
 152         uint32_t activate_flags = CRYPT_ACTIVATE_READONLY;
 153         char *root_hash_bytes = NULL;
 154         ssize_t hash_size;
 155         struct stat st;
 156         char *signature = NULL;
 157         int signature_size = 0, r;
 158
 159         if ((r = crypt_init_data_device(&cd, hash_device, data_device)))
 160                 goto out;
 161
 162         if (opt_ignore_corruption)
 163                 activate_flags |= CRYPT_ACTIVATE_IGNORE_CORRUPTION;
 164         if (opt_restart_on_corruption)
 165                 activate_flags |= CRYPT_ACTIVATE_RESTART_ON_CORRUPTION;
 166         if (opt_panic_on_corruption)
 167                 activate_flags |= CRYPT_ACTIVATE_PANIC_ON_CORRUPTION;
 168         if (opt_ignore_zero_blocks)
 169                 activate_flags |= CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS;
 170         if (opt_check_at_most_once)
 171                 activate_flags |= CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE;
 172
 173         if (opt_use_superblock) {
 174                 params.flags = flags;
 175                 params.hash_area_offset = hash_offset;
 176                 params.fec_area_offset = fec_offset;
 177                 params.fec_device = opt_fec_device;
 178                 params.fec_roots = opt_fec_roots;
 179                 r = crypt_load(cd, CRYPT_VERITY, &params);
 180         } else {
 181                 r = _prepare_format(&params, data_device, flags | CRYPT_VERITY_NO_HEADER);
 182                 if (r < 0)
 183                         goto out;
 184                 r = crypt_format(cd, CRYPT_VERITY, NULL, NULL, NULL, NULL, 0, &params);
 185         }
 186         if (r < 0)
 187                 goto out;
 188
 189         hash_size = crypt_get_volume_key_size(cd);
 190         if (crypt_hex_to_bytes(root_hash, &root_hash_bytes, 0) != hash_size) {
 191                 log_err(_("Invalid root hash string specified."));
 192                 r = -EINVAL;
 193                 goto out;
 194         }
 195
 196         if (opt_root_hash_signature) {
 197                 // FIXME: check max file size
 198                 if (stat(opt_root_hash_signature, &st) || !S_ISREG(st.st_mode) || !st.st_size) {
 199                         log_err(_("Invalid signature file %s."), opt_root_hash_signature);
 200                         r = -EINVAL;
 201                         goto out;
 202                 }
 203                 signature_size = st.st_size;
 204                 r = tools_read_mk(opt_root_hash_signature, &signature, signature_size);
 205                 if (r < 0) {
 206                         log_err(_("Cannot read signature file %s."), opt_root_hash_signature);
 207                         goto out;
 208                 }
 209         }
 210         r = crypt_activate_by_signed_key(cd, dm_device,
 211                                          root_hash_bytes,
 212                                          hash_size,
 213                                          signature, signature_size,
 214                                          activate_flags);
 215 out:
 216         crypt_safe_free(signature);
 217         crypt_free(cd);
 218         free(root_hash_bytes);
 219         free(CONST_CAST(char*)params.salt);
 220         return r;
 221 }
 222
 223 static int action_open(int arg)
 224 {
 225         return _activate(action_argv[1],
 226                          action_argv[0],
 227                          action_argv[2],
 228                          action_argv[3],
 229                          opt_root_hash_signature ? CRYPT_VERITY_ROOT_HASH_SIGNATURE : 0);
 230 }
 231
 232 static int action_verify(int arg)
 233 {
 234         return _activate(NULL,
 235                          action_argv[0],
 236                          action_argv[1],
 237                          action_argv[2],
 238                          CRYPT_VERITY_CHECK_HASH);
 239 }
 240
 241 static int action_close(int arg)
 242 {
 243         struct crypt_device *cd = NULL;
 244         int r;
 245
 246         r = crypt_init_by_name(&cd, action_argv[0]);
 247         if (r == 0)
 248                 r = crypt_deactivate(cd, action_argv[0]);
 249
 250         crypt_free(cd);
 251         return r;
 252 }
 253
 254 static int action_status(int arg)
 255 {
 256         crypt_status_info ci;
 257         struct crypt_active_device cad;
 258         struct crypt_params_verity vp = {};
 259         struct crypt_device *cd = NULL;
 260         struct stat st;
 261         char *backing_file, *root_hash;
 262         size_t root_hash_size;
 263         unsigned i, path = 0;
 264         int r = 0;
 265
 266         /* perhaps a path, not a dm device name */
 267         if (strchr(action_argv[0], '/') && !stat(action_argv[0], &st))
 268                 path = 1;
 269
 270         ci = crypt_status(NULL, action_argv[0]);
 271         switch (ci) {
 272         case CRYPT_INVALID:
 273                 r = -EINVAL;
 274                 break;
 275         case CRYPT_INACTIVE:
 276                 if (path)
 277                         log_std("%s is inactive.\n", action_argv[0]);
 278                 else
 279                         log_std("%s/%s is inactive.\n", crypt_get_dir(), action_argv[0]);
 280                 r = -ENODEV;
 281                 break;
 282         case CRYPT_ACTIVE:
 283         case CRYPT_BUSY:
 284                 if (path)
 285                         log_std("%s is active%s.\n", action_argv[0],
 286                                 ci == CRYPT_BUSY ? " and is in use" : "");
 287                 else
 288                         log_std("%s/%s is active%s.\n", crypt_get_dir(), action_argv[0],
 289                                 ci == CRYPT_BUSY ? " and is in use" : "");
 290
 291                 r = crypt_init_by_name_and_header(&cd, action_argv[0], NULL);
 292                 if (r < 0)
 293                         goto out;
 294
 295                 log_std("  type:        %s\n", crypt_get_type(cd) ?: "n/a");
 296
 297                 r = crypt_get_active_device(cd, action_argv[0], &cad);
 298                 if (r < 0)
 299                         goto out;
 300
 301                 /* Print only VERITY type devices */
 302                 r = crypt_get_verity_info(cd, &vp);
 303                 if (r < 0)
 304                         goto out;
 305
 306                 log_std("  status:      %s%s\n",
 307                         cad.flags & CRYPT_ACTIVATE_CORRUPTED ? "corrupted" : "verified",
 308                         vp.flags & CRYPT_VERITY_ROOT_HASH_SIGNATURE ? " (with signature)" : "");
 309
 310                 log_std("  hash type:   %u\n", vp.hash_type);
 311                 log_std("  data block:  %u\n", vp.data_block_size);
 312                 log_std("  hash block:  %u\n", vp.hash_block_size);
 313                 log_std("  hash name:   %s\n", vp.hash_name);
 314                 log_std("  salt:        ");
 315                 if (vp.salt_size)
 316                         for(i = 0; i < vp.salt_size; i++)
 317                                 log_std("%02hhx", (const char)vp.salt[i]);
 318                 else
 319                         log_std("-");
 320                 log_std("\n");
 321
 322                 log_std("  data device: %s\n", vp.data_device);
 323                 if ((backing_file = crypt_loop_backing_file(vp.data_device))) {
 324                         log_std("  data loop:   %s\n", backing_file);
 325                         free(backing_file);
 326                 }
 327                 log_std("  size:        %" PRIu64 " sectors\n", cad.size);
 328                 log_std("  mode:        %s\n", cad.flags & CRYPT_ACTIVATE_READONLY ?
 329                                            "readonly" : "read/write");
 330
 331                 log_std("  hash device: %s\n", vp.hash_device);
 332                 if ((backing_file = crypt_loop_backing_file(vp.hash_device))) {
 333                         log_std("  hash loop:   %s\n", backing_file);
 334                         free(backing_file);
 335                 }
 336                 log_std("  hash offset: %" PRIu64 " sectors\n",
 337                         vp.hash_area_offset * vp.hash_block_size / 512);
 338
 339                 if (vp.fec_device) {
 340                         log_std("  FEC device:  %s\n", vp.fec_device);
 341                         if ((backing_file = crypt_loop_backing_file(opt_fec_device))) {
 342                                 log_std("  FEC loop:    %s\n", backing_file);
 343                                 free(backing_file);
 344                         }
 345                         log_std("  FEC offset:  %" PRIu64 " sectors\n",
 346                                 vp.fec_area_offset * vp.hash_block_size / 512);
 347                         log_std("  FEC roots:   %u\n", vp.fec_roots);
 348                 }
 349
 350                 root_hash_size = crypt_get_volume_key_size(cd);
 351                 if (root_hash_size > 0 && (root_hash = malloc(root_hash_size))) {
 352                         r = crypt_volume_key_get(cd, CRYPT_ANY_SLOT, root_hash, &root_hash_size, NULL, 0);
 353                         if (!r) {
 354                                 log_std("  root hash:   ");
 355                                 for (i = 0; i < root_hash_size; i++)
 356                                         log_std("%02hhx", (const char)root_hash[i]);
 357                                 log_std("\n");
 358                         }
 359                         free(root_hash);
 360                 }
 361
 362                 if (cad.flags & (CRYPT_ACTIVATE_IGNORE_CORRUPTION|
 363                                  CRYPT_ACTIVATE_RESTART_ON_CORRUPTION|
 364                                  CRYPT_ACTIVATE_PANIC_ON_CORRUPTION|
 365                                  CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS|
 366                                  CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE))
 367                         log_std("  flags:       %s%s%s%s%s\n",
 368                                 (cad.flags & CRYPT_ACTIVATE_IGNORE_CORRUPTION) ? "ignore_corruption " : "",
 369                                 (cad.flags & CRYPT_ACTIVATE_RESTART_ON_CORRUPTION) ? "restart_on_corruption " : "",
 370                                 (cad.flags & CRYPT_ACTIVATE_PANIC_ON_CORRUPTION) ? "panic_on_corruption " : "",
 371                                 (cad.flags & CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS) ? "ignore_zero_blocks " : "",
 372                                 (cad.flags & CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE) ? "check_at_most_once" : "");
 373         }
 374 out:
 375         crypt_free(cd);
 376         if (r == -ENOTSUP)
 377                 r = 0;
 378         return r;
 379 }
 380
 381 static int action_dump(int arg)
 382 {
 383         struct crypt_device *cd = NULL;
 384         struct crypt_params_verity params = {};
 385         int r;
 386
 387         if ((r = crypt_init(&cd, action_argv[0])))
 388                 return r;
 389
 390         params.hash_area_offset = hash_offset;
 391         params.fec_area_offset = fec_offset;
 392         r = crypt_load(cd, CRYPT_VERITY, &params);
 393         if (!r)
 394                 crypt_dump(cd);
 395         crypt_free(cd);
 396         return r;
 397 }
 398
 399 static struct action_type {
 400         const char *type;
 401         int (*handler)(int);
 402         int required_action_argc;
 403         const char *arg_desc;
 404         const char *desc;
 405 } action_types[] = {
 406         { "format",     action_format, 2, N_("<data_device> <hash_device>"),N_("format device") },
 407         { "verify",     action_verify, 3, N_("<data_device> <hash_device> <root_hash>"),N_("verify device") },
 408         { "open",       action_open,   4, N_("<data_device> <name> <hash_device> <root_hash>"),N_("open device as <name>") },
 409         { "close",      action_close,  1, N_("<name>"),N_("close device (remove mapping)") },
 410         { "status",     action_status, 1, N_("<name>"),N_("show active device status") },
 411         { "dump",       action_dump,   1, N_("<hash_device>"),N_("show on-disk information") },
 412         { NULL, NULL, 0, NULL, NULL }
 413 };
 414
 415 static void help(poptContext popt_context,
 416                  enum poptCallbackReason reason __attribute__((unused)),
 417                  struct poptOption *key,
 418                  const char *arg __attribute__((unused)),
 419                  void *data __attribute__((unused)))
 420 {
 421         struct action_type *action;
 422
 423         if (key->shortName == '?') {
 424                 log_std("%s %s\n", PACKAGE_VERITY, PACKAGE_VERSION);
 425                 poptPrintHelp(popt_context, stdout, 0);
 426                 log_std(_("\n"
 427                          "<action> is one of:\n"));
 428                 for(action = action_types; action->type; action++)
 429                         log_std("\t%s %s - %s\n", action->type, _(action->arg_desc), _(action->desc));
 430                 log_std(_("\n"
 431                          "<name> is the device to create under %s\n"
 432                          "<data_device> is the data device\n"
 433                          "<hash_device> is the device containing verification data\n"
 434                          "<root_hash> hash of the root node on <hash_device>\n"),
 435                         crypt_get_dir());
 436
 437                 log_std(_("\nDefault compiled-in dm-verity parameters:\n"
 438                          "\tHash: %s, Data block (bytes): %u, "
 439                          "Hash block (bytes): %u, Salt size: %u, Hash format: %u\n"),
 440                         DEFAULT_VERITY_HASH, DEFAULT_VERITY_DATA_BLOCK,
 441                         DEFAULT_VERITY_HASH_BLOCK, DEFAULT_VERITY_SALT_SIZE,
 442                         1);
 443                 tools_cleanup();
 444                 poptFreeContext(popt_context);
 445                 exit(EXIT_SUCCESS);
 446         } else if (key->shortName == 'V') {
 447                 log_std("%s %s\n", PACKAGE_VERITY, PACKAGE_VERSION);
 448                 tools_cleanup();
 449                 poptFreeContext(popt_context);
 450                 exit(EXIT_SUCCESS);
 451         } else
 452                 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
 453 }
 454
 455 static int run_action(struct action_type *action)
 456 {
 457         int r;
 458
 459         log_dbg("Running command %s.", action->type);
 460
 461         r = action->handler(0);
 462
 463         show_status(r);
 464         return translate_errno(r);
 465 }
 466
 467 int main(int argc, const char **argv)
 468 {
 469         static const char *null_action_argv[] = {NULL};
 470         static struct poptOption popt_help_options[] = {
 471                 { NULL,    '\0', POPT_ARG_CALLBACK, help, 0, NULL,                         NULL },
 472                 { "help",  '?',  POPT_ARG_NONE,     NULL, 0, N_("Show this help message"), NULL },
 473                 { "usage", '\0', POPT_ARG_NONE,     NULL, 0, N_("Display brief usage"),    NULL },
 474                 { "version",'V', POPT_ARG_NONE,     NULL, 0, N_("Print package version"),  NULL },
 475                 POPT_TABLEEND
 476         };
 477         static struct poptOption popt_options[] = {
 478                 { NULL,              '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
 479                 { "verbose",         'v',  POPT_ARG_NONE, &opt_verbose,      0, N_("Shows more detailed error messages"), NULL },
 480                 { "debug",           '\0', POPT_ARG_NONE, &opt_debug,        0, N_("Show debug messages"), NULL },
 481                 { "no-superblock",   0,    POPT_ARG_VAL,  &opt_use_superblock,   0, N_("Do not use verity superblock"), NULL },
 482                 { "format",          0,    POPT_ARG_INT,  &opt_hash_type,        0, N_("Format type (1 - normal, 0 - original Chrome OS)"), N_("number") },
 483                 { "data-block-size", 0,    POPT_ARG_INT,  &opt_data_block_size,  0, N_("Block size on the data device"), N_("bytes") },
 484                 { "hash-block-size", 0,    POPT_ARG_INT,  &opt_hash_block_size,  0, N_("Block size on the hash device"), N_("bytes") },
 485                 { "fec-roots",       0,    POPT_ARG_INT,  &opt_fec_roots,        0, N_("FEC parity bytes"), N_("bytes") },
 486                 { "data-blocks",     0,    POPT_ARG_STRING, NULL,       1, N_("The number of blocks in the data file"), N_("blocks") },
 487                 { "fec-device",      0,    POPT_ARG_STRING, &opt_fec_device,     0, N_("Path to device with error correction data"), N_("path") },
 488                 { "hash-offset",     0,    POPT_ARG_STRING, NULL,       2, N_("Starting offset on the hash device"), N_("bytes") },
 489                 { "fec-offset",      0,    POPT_ARG_STRING, NULL,       3, N_("Starting offset on the FEC device"), N_("bytes") },
 490                 { "hash",            'h',  POPT_ARG_STRING, &opt_hash_algorithm, 0, N_("Hash algorithm"), N_("string") },
 491                 { "salt",            's',  POPT_ARG_STRING, &opt_salt,    0, N_("Salt"), N_("hex string") },
 492                 { "uuid",            '\0', POPT_ARG_STRING, &opt_uuid,       0, N_("UUID for device to use"), NULL },
 493                 { "root-hash-signature",'\0', POPT_ARG_STRING, &opt_root_hash_signature,  0, N_("Path to root hash signature file"), NULL },
 494                 { "restart-on-corruption", 0,POPT_ARG_NONE,&opt_restart_on_corruption, 0, N_("Restart kernel if corruption is detected"), NULL },
 495                 { "panic-on-corruption", 0,POPT_ARG_NONE, &opt_panic_on_corruption, 0, N_("Panic kernel if corruption is detected"), NULL },
 496                 { "ignore-corruption", 0,  POPT_ARG_NONE, &opt_ignore_corruption,  0, N_("Ignore corruption, log it only"), NULL },
 497                 { "ignore-zero-blocks", 0, POPT_ARG_NONE, &opt_ignore_zero_blocks, 0, N_("Do not verify zeroed blocks"), NULL },
 498                 { "check-at-most-once", 0, POPT_ARG_NONE, &opt_check_at_most_once, 0, N_("Verify data block only the first time it is read"), NULL },
 499                 POPT_TABLEEND
 500         };
 501
 502         poptContext popt_context;
 503         struct action_type *action;
 504         const char *aname;
 505         int r;
 506
 507         crypt_set_log_callback(NULL, tool_log, NULL);
 508
 509         setlocale(LC_ALL, "");
 510         bindtextdomain(PACKAGE, LOCALEDIR);
 511         textdomain(PACKAGE);
 512
 513         popt_context = poptGetContext("verity", argc, argv, popt_options, 0);
 514         poptSetOtherOptionHelp(popt_context,
 515                                _("[OPTION...] <action> <action-specific>"));
 516
 517         while((r = poptGetNextOpt(popt_context)) > 0) {
 518                 unsigned long long ull_value;
 519                 char *endp, *str = poptGetOptArg(popt_context);
 520
 521                 errno = 0;
 522                 ull_value = strtoull(str, &endp, 10);
 523                 if (*endp || !*str || !isdigit(*str) ||
 524                     (errno == ERANGE && ull_value == ULLONG_MAX) ||
 525                     (errno != 0 && ull_value == 0))
 526                         r = POPT_ERROR_BADNUMBER;
 527
 528                 free(str);
 529
 530                 switch(r) {
 531                         case 1:
 532                                 data_blocks = ull_value;
 533                                 break;
 534                         case 2:
 535                                 hash_offset = ull_value;
 536                                 break;
 537                         case 3:
 538                                 fec_offset = ull_value;
 539                                 break;
 540                 }
 541
 542                 if (r < 0)
 543                         break;
 544         }
 545
 546         if (r < -1)
 547                 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
 548                       poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
 549
 550         if (!(aname = poptGetArg(popt_context)))
 551                 usage(popt_context, EXIT_FAILURE, _("Argument <action> missing."),
 552                       poptGetInvocationName(popt_context));
 553
 554         action_argc = 0;
 555         action_argv = poptGetArgs(popt_context);
 556         /* Make return values of poptGetArgs more consistent in case of remaining argc = 0 */
 557         if(!action_argv)
 558                 action_argv = null_action_argv;
 559
 560         /* Count args, somewhat unnice, change? */
 561         while(action_argv[action_argc] != NULL)
 562                 action_argc++;
 563
 564         /* Handle aliases */
 565         if (!strcmp(aname, "create") && action_argc > 1) {
 566                 /* create command had historically switched arguments */
 567                 if (action_argv[0] && action_argv[1]) {
 568                         const char *tmp = action_argv[0];
 569                         action_argv[0] = action_argv[1];
 570                         action_argv[1] = tmp;
 571                 }
 572                 aname = "open";
 573         } else if (!strcmp(aname, "remove")) {
 574                 aname = "close";
 575         }
 576
 577         for (action = action_types; action->type; action++)
 578                 if (strcmp(action->type, aname) == 0)
 579                         break;
 580
 581         if (!action->type)
 582                 usage(popt_context, EXIT_FAILURE, _("Unknown action."),
 583                       poptGetInvocationName(popt_context));
 584
 585         if (action_argc < action->required_action_argc) {
 586                 char buf[128];
 587                 snprintf(buf, 128,_("%s: requires %s as arguments"), action->type, action->arg_desc);
 588                 usage(popt_context, EXIT_FAILURE, buf,
 589                       poptGetInvocationName(popt_context));
 590         }
 591
 592         if (opt_data_block_size < 0 || opt_hash_block_size < 0 || opt_hash_type < 0) {
 593                 usage(popt_context, EXIT_FAILURE,
 594                       _("Negative number for option not permitted."),
 595                       poptGetInvocationName(popt_context));
 596         }
 597
 598         if ((opt_ignore_corruption || opt_restart_on_corruption || opt_ignore_zero_blocks) && strcmp(aname, "open"))
 599                 usage(popt_context, EXIT_FAILURE,
 600                 _("Option --ignore-corruption, --restart-on-corruption or --ignore-zero-blocks is allowed only for open operation."),
 601                 poptGetInvocationName(popt_context));
 602
 603         if (opt_root_hash_signature && strcmp(aname, "open"))
 604                 usage(popt_context, EXIT_FAILURE,
 605                 _("Option --root-hash-signature can be used only for open operation."),
 606                 poptGetInvocationName(popt_context));
 607
 608         if (opt_ignore_corruption && opt_restart_on_corruption)
 609                 usage(popt_context, EXIT_FAILURE,
 610                 _("Option --ignore-corruption and --restart-on-corruption cannot be used together."),
 611                 poptGetInvocationName(popt_context));
 612
 613         if (opt_panic_on_corruption && opt_restart_on_corruption)
 614                 usage(popt_context, EXIT_FAILURE,
 615                 _("Option --panic-on-corruption and --restart-on-corruption cannot be used together."),
 616                 poptGetInvocationName(popt_context));
 617
 618         if (opt_debug) {
 619                 opt_verbose = 1;
 620                 crypt_set_debug_level(-1);
 621                 dbg_version_and_cmd(argc, argv);
 622         }
 623
 624         r = run_action(action);
 625         tools_cleanup();
 626         poptFreeContext(popt_context);
 627         return r;
 628 }