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   1 /*
   2  * ntfs-capture.c
   3  *
   4  * Capture a WIM image from a NTFS volume.  We capture everything we can,
   5  * including security data and alternate data streams.  There should be no loss
   6  * of information.
   7  */
   8
   9 /*
  10  * Copyright (C) 2012 Eric Biggers
  11  *
  12  * This file is part of wimlib, a library for working with WIM files.
  13  *
  14  * wimlib is free software; you can redistribute it and/or modify it under the
  15  * terms of the GNU Lesser General Public License as published by the Free
  16  * Software Foundation; either version 2.1 of the License, or (at your option)
  17  * any later version.
  18  *
  19  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  20  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  21  * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  22  * details.
  23  *
  24  * You should have received a copy of the GNU Lesser General Public License
  25  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  26  */
  27
  28 #include "config.h"
  29 #include "wimlib_internal.h"
  30
  31
  32 #ifdef WITH_NTFS_3G
  33 #include "dentry.h"
  34 #include "lookup_table.h"
  35 #include "io.h"
  36 #include <ntfs-3g/layout.h>
  37 #include <ntfs-3g/acls.h>
  38 #include <ntfs-3g/attrib.h>
  39 #include <ntfs-3g/misc.h>
  40 #include <ntfs-3g/reparse.h>
  41 #include <ntfs-3g/security.h>
  42 #include <ntfs-3g/volume.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45
  46 extern int ntfs_inode_get_security(ntfs_inode *ni, u32 selection, char *buf,
  47                                    u32 buflen, u32 *psize);
  48
  49 extern int ntfs_inode_get_attributes(ntfs_inode *ni);
  50
  51 /* Structure that allows searching the security descriptors by SHA1 message
  52  * digest. */
  53 struct sd_set {
  54         struct wim_security_data *sd;
  55         struct sd_node *root;
  56 };
  57
  58 /* Binary tree node of security descriptors, indexed by the @hash field. */
  59 struct sd_node {
  60         int security_id;
  61         u8 hash[SHA1_HASH_SIZE];
  62         struct sd_node *left;
  63         struct sd_node *right;
  64 };
  65
  66 static void free_sd_tree(struct sd_node *root)
  67 {
  68         if (root) {
  69                 free_sd_tree(root->left);
  70                 free_sd_tree(root->right);
  71                 FREE(root);
  72         }
  73 }
  74 /* Frees a security descriptor index set. */
  75 static void destroy_sd_set(struct sd_set *sd_set)
  76 {
  77         free_sd_tree(sd_set->root);
  78 }
  79
  80 /* Inserts a a new node into the security descriptor index tree. */
  81 static void insert_sd_node(struct sd_node *new, struct sd_node *root)
  82 {
  83         int cmp = hashes_cmp(new->hash, root->hash);
  84         if (cmp < 0) {
  85                 if (root->left)
  86                         insert_sd_node(new, root->left);
  87                 else
  88                         root->left = new;
  89         } else if (cmp > 0) {
  90                 if (root->right)
  91                         insert_sd_node(new, root->right);
  92                 else
  93                         root->right = new;
  94         } else {
  95                 wimlib_assert(0);
  96         }
  97 }
  98
  99 /* Returns the security ID of the security data having a SHA1 message digest of
 100  * @hash in the security descriptor index tree rooted at @root.
 101  *
 102  * If not found, return -1. */
 103 static int lookup_sd(const u8 hash[SHA1_HASH_SIZE], struct sd_node *root)
 104 {
 105         int cmp;
 106         if (!root)
 107                 return -1;
 108         cmp = hashes_cmp(hash, root->hash);
 109         if (cmp < 0)
 110                 return lookup_sd(hash, root->left);
 111         else if (cmp > 0)
 112                 return lookup_sd(hash, root->right);
 113         else
 114                 return root->security_id;
 115 }
 116
 117 /*
 118  * Adds a security descriptor to the indexed security descriptor set as well as
 119  * the corresponding `struct wim_security_data', and returns the new security
 120  * ID; or, if there is an existing security descriptor that is the same, return
 121  * the security ID for it.  If a new security descriptor cannot be allocated,
 122  * return -1.
 123  */
 124 static int sd_set_add_sd(struct sd_set *sd_set, const u8 *descriptor,
 125                          size_t size)
 126 {
 127         u8 hash[SHA1_HASH_SIZE];
 128         int security_id;
 129         struct sd_node *new;
 130         u8 **descriptors;
 131         u64 *sizes;
 132         u8 *descr_copy;
 133         struct wim_security_data *sd;
 134
 135         sha1_buffer(descriptor, size, hash);
 136         security_id = lookup_sd(hash, sd_set->root);
 137         if (security_id >= 0)
 138                 return security_id;
 139
 140         new = MALLOC(sizeof(*new));
 141         if (!new)
 142                 goto out;
 143         descr_copy = MALLOC(size);
 144         if (!descr_copy)
 145                 goto out_free_node;
 146
 147         sd = sd_set->sd;
 148
 149         memcpy(descr_copy, descriptor, size);
 150         new->security_id = sd->num_entries;
 151         new->left = NULL;
 152         new->right = NULL;
 153         copy_hash(new->hash, hash);
 154
 155
 156         descriptors = REALLOC(sd->descriptors,
 157                               (sd->num_entries + 1) * sizeof(sd->descriptors[0]));
 158         if (!descriptors)
 159                 goto out_free_descr;
 160         sd->descriptors = descriptors;
 161         sizes = REALLOC(sd->sizes,
 162                         (sd->num_entries + 1) * sizeof(sd->sizes[0]));
 163         if (!sizes)
 164                 goto out_free_descr;
 165         sd->sizes = sizes;
 166         sd->descriptors[sd->num_entries] = descr_copy;
 167         sd->sizes[sd->num_entries] = size;
 168         sd->num_entries++;
 169         sd->total_length += size + sizeof(sd->sizes[0]);
 170
 171         if (sd_set->root)
 172                 insert_sd_node(sd_set->root, new);
 173         else
 174                 sd_set->root = new;
 175         return new->security_id;
 176 out_free_descr:
 177         FREE(descr_copy);
 178 out_free_node:
 179         FREE(new);
 180 out:
 181         return -1;
 182 }
 183
 184 static inline ntfschar *attr_record_name(ATTR_RECORD *ar)
 185 {
 186         return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
 187 }
 188
 189 /* Calculates the SHA1 message digest of a NTFS attribute.
 190  *
 191  * @ni:  The NTFS inode containing the attribute.
 192  * @ar:  The ATTR_RECORD describing the attribute.
 193  * @md:  If successful, the returned SHA1 message digest.
 194  *
 195  * Return 0 on success or nonzero on error.
 196  */
 197 static int ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
 198                              u8 md[SHA1_HASH_SIZE])
 199 {
 200         s64 pos = 0;
 201         s64 bytes_remaining;
 202         char buf[4096];
 203         ntfs_attr *na;
 204         SHA_CTX ctx;
 205
 206         na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
 207                             ar->name_length);
 208         if (!na) {
 209                 ERROR_WITH_ERRNO("Failed to open NTFS attribute");
 210                 return WIMLIB_ERR_NTFS_3G;
 211         }
 212
 213         bytes_remaining = na->data_size;
 214         sha1_init(&ctx);
 215
 216         DEBUG("Calculating SHA1 message digest (%"PRIu64" bytes)",
 217                         bytes_remaining);
 218
 219         while (bytes_remaining) {
 220                 s64 to_read = min(bytes_remaining, sizeof(buf));
 221                 if (ntfs_attr_pread(na, pos, to_read, buf) != to_read) {
 222                         ERROR_WITH_ERRNO("Error reading NTFS attribute");
 223                         return WIMLIB_ERR_NTFS_3G;
 224                 }
 225                 sha1_update(&ctx, buf, to_read);
 226                 pos += to_read;
 227                 bytes_remaining -= to_read;
 228         }
 229         sha1_final(md, &ctx);
 230         ntfs_attr_close(na);
 231         return 0;
 232 }
 233
 234 /* Load the streams from a WIM file or reparse point in the NTFS volume into the
 235  * WIM lookup table */
 236 static int capture_ntfs_streams(struct dentry *dentry, ntfs_inode *ni,
 237                                 char path[], size_t path_len,
 238                                 struct lookup_table *lookup_table,
 239                                 ntfs_volume **ntfs_vol_p,
 240                                 ATTR_TYPES type)
 241 {
 242
 243         ntfs_attr_search_ctx *actx;
 244         u8 attr_hash[SHA1_HASH_SIZE];
 245         struct ntfs_location *ntfs_loc;
 246         struct lookup_table_entry *lte;
 247         int ret = 0;
 248
 249         DEBUG("Capturing NTFS data streams from `%s'", path);
 250
 251         /* Get context to search the streams of the NTFS file. */
 252         actx = ntfs_attr_get_search_ctx(ni, NULL);
 253         if (!actx) {
 254                 ERROR_WITH_ERRNO("Cannot get attribute search "
 255                                  "context");
 256                 return WIMLIB_ERR_NTFS_3G;
 257         }
 258
 259         /* Capture each data stream or reparse data stream. */
 260         while (!ntfs_attr_lookup(type, NULL, 0,
 261                                  CASE_SENSITIVE, 0, NULL, 0, actx))
 262         {
 263                 char *stream_name_utf8;
 264                 size_t stream_name_utf16_len;
 265
 266                 /* Checksum the stream. */
 267                 ret = ntfs_attr_sha1sum(ni, actx->attr, attr_hash);
 268                 if (ret != 0)
 269                         goto out_put_actx;
 270
 271                 /* Make a lookup table entry for the stream, or use an existing
 272                  * one if there's already an identical stream. */
 273                 lte = __lookup_resource(lookup_table, attr_hash);
 274                 ret = WIMLIB_ERR_NOMEM;
 275                 if (lte) {
 276                         lte->refcnt++;
 277                 } else {
 278                         struct ntfs_location *ntfs_loc;
 279
 280                         ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
 281                         if (!ntfs_loc)
 282                                 goto out_put_actx;
 283                         ntfs_loc->ntfs_vol_p = ntfs_vol_p;
 284                         ntfs_loc->path_utf8 = MALLOC(path_len + 1);
 285                         if (!ntfs_loc->path_utf8)
 286                                 goto out_free_ntfs_loc;
 287                         memcpy(ntfs_loc->path_utf8, path, path_len + 1);
 288                         ntfs_loc->stream_name_utf16 = MALLOC(actx->attr->name_length * 2);
 289                         if (!ntfs_loc->stream_name_utf16)
 290                                 goto out_free_ntfs_loc;
 291                         memcpy(ntfs_loc->stream_name_utf16,
 292                                attr_record_name(actx->attr),
 293                                actx->attr->name_length * 2);
 294
 295                         ntfs_loc->stream_name_utf16_num_chars = actx->attr->name_length;
 296                         ntfs_loc->is_reparse_point = (type == AT_REPARSE_POINT);
 297                         lte = new_lookup_table_entry();
 298                         if (!lte)
 299                                 goto out_free_ntfs_loc;
 300                         lte->ntfs_loc = ntfs_loc;
 301                         lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
 302                         lte->resource_entry.original_size = actx->attr->data_size;
 303                         lte->resource_entry.size = actx->attr->data_size;
 304                         DEBUG("Add resource for `%s' (size = %zu)",
 305                                 dentry->file_name_utf8,
 306                                 lte->resource_entry.original_size);
 307                         copy_hash(lte->hash, attr_hash);
 308                         lookup_table_insert(lookup_table, lte);
 309                 }
 310                 if (actx->attr->name_length == 0) {
 311                         if (dentry->lte) {
 312                                 ERROR("Found two un-named data streams for "
 313                                       "`%s'", path);
 314                                 ret = WIMLIB_ERR_NTFS_3G;
 315                                 goto out_free_lte;
 316                         }
 317                         dentry->lte = lte;
 318                 } else {
 319                         struct ads_entry *new_ads_entry;
 320                         stream_name_utf8 = utf16_to_utf8((const u8*)attr_record_name(actx->attr),
 321                                                          actx->attr->name_length,
 322                                                          &stream_name_utf16_len);
 323                         if (!stream_name_utf8)
 324                                 goto out_free_lte;
 325                         new_ads_entry = dentry_add_ads(dentry, stream_name_utf8);
 326                         FREE(stream_name_utf8);
 327                         if (!new_ads_entry)
 328                                 goto out_free_lte;
 329
 330                         new_ads_entry->lte = lte;
 331                 }
 332         }
 333         ret = 0;
 334         goto out_put_actx;
 335 out_free_lte:
 336         free_lookup_table_entry(lte);
 337 out_free_ntfs_loc:
 338         if (ntfs_loc) {
 339                 FREE(ntfs_loc->path_utf8);
 340                 FREE(ntfs_loc->stream_name_utf16);
 341                 FREE(ntfs_loc);
 342         }
 343 out_put_actx:
 344         ntfs_attr_put_search_ctx(actx);
 345         if (ret == 0)
 346                 DEBUG("Successfully captured NTFS streams from `%s'", path);
 347         else
 348                 DEBUG("Failed to capture NTFS streams from `%s", path);
 349         return ret;
 350 }
 351
 352 struct readdir_ctx {
 353         struct dentry       *parent;
 354         ntfs_inode          *dir_ni;
 355         char                *path;
 356         size_t               path_len;
 357         struct lookup_table *lookup_table;
 358         struct sd_set       *sd_set;
 359         const struct capture_config *config;
 360         ntfs_volume        **ntfs_vol_p;
 361 };
 362
 363 static int
 364 build_dentry_tree_ntfs_recursive(struct dentry **root_p, ntfs_inode *ni,
 365                                  char path[], size_t path_len,
 366                                  struct lookup_table *lookup_table,
 367                                  struct sd_set *sd_set,
 368                                  const struct capture_config *config,
 369                                  ntfs_volume **ntfs_vol_p);
 370
 371 static int wim_ntfs_capture_filldir(void *dirent, const ntfschar *name,
 372                                     const int name_len, const int name_type,
 373                                     const s64 pos, const MFT_REF mref,
 374                                     const unsigned dt_type)
 375 {
 376         struct readdir_ctx *ctx;
 377         size_t utf8_name_len;
 378         char *utf8_name;
 379         struct dentry *child = NULL;
 380         int ret;
 381         size_t path_len;
 382
 383         if (name_type == FILE_NAME_DOS)
 384                 return 0;
 385
 386         ret = -1;
 387
 388         utf8_name = utf16_to_utf8((const u8*)name, name_len * 2,
 389                                   &utf8_name_len);
 390         if (!utf8_name)
 391                 goto out;
 392
 393         if (utf8_name[0] == '.' &&
 394              (utf8_name[1] == '\0' ||
 395               (utf8_name[1] == '.' && utf8_name[2] == '\0'))) {
 396                 DEBUG("Skipping dentry `%s'", utf8_name);
 397                 ret = 0;
 398                 goto out_free_utf8_name;
 399         }
 400
 401         DEBUG("Opening inode for `%s'", utf8_name);
 402
 403         ctx = dirent;
 404
 405         ntfs_inode *ni = ntfs_inode_open(ctx->dir_ni->vol, mref);
 406         if (!ni) {
 407                 ERROR_WITH_ERRNO("Failed to open NTFS inode");
 408                 ret = 1;
 409         }
 410         path_len = ctx->path_len;
 411         if (path_len != 1)
 412                 ctx->path[path_len++] = '/';
 413         memcpy(ctx->path + path_len, utf8_name, utf8_name_len + 1);
 414         path_len += utf8_name_len;
 415         ret = build_dentry_tree_ntfs_recursive(&child, ni, ctx->path, path_len,
 416                                                ctx->lookup_table, ctx->sd_set,
 417                                                ctx->config, ctx->ntfs_vol_p);
 418
 419         if (child) {
 420                 DEBUG("Linking dentry `%s' with parent `%s'",
 421                       child->file_name_utf8, ctx->parent->file_name_utf8);
 422                 link_dentry(child, ctx->parent);
 423         }
 424 out_close_ni:
 425         ntfs_inode_close(ni);
 426 out_free_utf8_name:
 427         FREE(utf8_name);
 428 out:
 429         return ret;
 430 }
 431
 432 /* Recursively build a WIM dentry tree corresponding to a NTFS volume.
 433  * At the same time, update the WIM lookup table with lookup table entries for
 434  * the NTFS streams, and build an array of security descriptors.
 435  */
 436 static int build_dentry_tree_ntfs_recursive(struct dentry **root_p,
 437                                             ntfs_inode *ni,
 438                                             char path[], size_t path_len,
 439                                             struct lookup_table *lookup_table,
 440                                             struct sd_set *sd_set,
 441                                             const struct capture_config *config,
 442                                             ntfs_volume **ntfs_vol_p)
 443 {
 444         u32 attributes;
 445         int mrec_flags;
 446         u32 sd_size;
 447         int ret = 0;
 448         struct dentry *root;
 449
 450         if (exclude_path(path, config, false)) {
 451                 DEBUG("Excluding `%s' from capture", path);
 452                 return 0;
 453         }
 454
 455         DEBUG("Starting recursive capture at path = `%s'", path);
 456         mrec_flags = ni->mrec->flags;
 457         attributes = ntfs_inode_get_attributes(ni);
 458
 459         root = new_dentry(path_basename(path));
 460         if (!root)
 461                 return WIMLIB_ERR_NOMEM;
 462
 463         *root_p = root;
 464         root->creation_time    = le64_to_cpu(ni->creation_time);
 465         root->last_write_time  = le64_to_cpu(ni->last_data_change_time);
 466         root->last_access_time = le64_to_cpu(ni->last_access_time);
 467         root->security_id      = le32_to_cpu(ni->security_id);
 468         root->attributes       = le32_to_cpu(attributes);
 469         root->hard_link        = ni->mft_no;
 470         root->resolved         = true;
 471
 472         if (attributes & FILE_ATTR_REPARSE_POINT) {
 473                 DEBUG("Reparse point `%s'", path);
 474                 /* Junction point, symbolic link, or other reparse point */
 475                 ret = capture_ntfs_streams(root, ni, path, path_len,
 476                                            lookup_table, ntfs_vol_p,
 477                                            AT_REPARSE_POINT);
 478         } else if (mrec_flags & MFT_RECORD_IS_DIRECTORY) {
 479                 DEBUG("Directory `%s'", path);
 480
 481                 /* Normal directory */
 482                 s64 pos = 0;
 483                 struct readdir_ctx ctx = {
 484                         .parent       = root,
 485                         .dir_ni       = ni,
 486                         .path         = path,
 487                         .path_len     = path_len,
 488                         .lookup_table = lookup_table,
 489                         .sd_set       = sd_set,
 490                         .config       = config,
 491                         .ntfs_vol_p   = ntfs_vol_p,
 492                 };
 493                 ret = ntfs_readdir(ni, &pos, &ctx, wim_ntfs_capture_filldir);
 494                 if (ret != 0) {
 495                         ERROR_WITH_ERRNO("ntfs_readdir()");
 496                         ret = WIMLIB_ERR_NTFS_3G;
 497                 }
 498         } else {
 499                 DEBUG("Normal file `%s'", path);
 500                 /* Normal file */
 501                 ret = capture_ntfs_streams(root, ni, path, path_len,
 502                                            lookup_table, ntfs_vol_p,
 503                                            AT_DATA);
 504         }
 505         if (ret != 0)
 506                 return ret;
 507
 508         ret = ntfs_inode_get_security(ni,
 509                                       OWNER_SECURITY_INFORMATION |
 510                                       GROUP_SECURITY_INFORMATION |
 511                                       DACL_SECURITY_INFORMATION  |
 512                                       SACL_SECURITY_INFORMATION,
 513                                       NULL, 0, &sd_size);
 514         u8 sd[sd_size];
 515         ret = ntfs_inode_get_security(ni,
 516                                       OWNER_SECURITY_INFORMATION |
 517                                       GROUP_SECURITY_INFORMATION |
 518                                       DACL_SECURITY_INFORMATION  |
 519                                       SACL_SECURITY_INFORMATION,
 520                                       sd, sd_size, &sd_size);
 521         if (ret == 0) {
 522                 ERROR_WITH_ERRNO("Failed to get security information from "
 523                                  "`%s'", path);
 524                 ret = WIMLIB_ERR_NTFS_3G;
 525         } else {
 526                 if (ret > 0) {
 527                         /*print_security_descriptor(sd, sd_size);*/
 528                         root->security_id = sd_set_add_sd(sd_set, sd, sd_size);
 529                         DEBUG("Added security ID = %u for `%s'",
 530                               root->security_id, path);
 531                 } else {
 532                         root->security_id = -1;
 533                         DEBUG("No security ID for `%s'", path);
 534                 }
 535                 ret = 0;
 536         }
 537         return ret;
 538 }
 539
 540 static int build_dentry_tree_ntfs(struct dentry **root_p,
 541                                   const char *device,
 542                                   struct lookup_table *lookup_table,
 543                                   struct wim_security_data *sd,
 544                                   const struct capture_config *config,
 545                                   int flags,
 546                                   void *extra_arg)
 547 {
 548         ntfs_volume *vol;
 549         ntfs_inode *root_ni;
 550         int ret = 0;
 551         struct sd_set sd_set;
 552         sd_set.sd = sd;
 553         sd_set.root = NULL;
 554         ntfs_volume **ntfs_vol_p = extra_arg;
 555
 556         DEBUG("Mounting NTFS volume `%s' read-only", device);
 557
 558         vol = ntfs_mount(device, MS_RDONLY);
 559         if (!vol) {
 560                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 561                                  device);
 562                 return WIMLIB_ERR_NTFS_3G;
 563         }
 564
 565         NVolClearShowSysFiles(vol);
 566
 567         DEBUG("Opening root NTFS dentry");
 568         root_ni = ntfs_inode_open(vol, FILE_root);
 569         if (!root_ni) {
 570                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 571                                  "`%s'", device);
 572                 ret = WIMLIB_ERR_NTFS_3G;
 573                 goto out;
 574         }
 575         char *path = MALLOC(32769);
 576         if (!path) {
 577                 ERROR("Could not allocate memory for NTFS pathname");
 578                 goto out_cleanup;
 579         }
 580         path[0] = '/';
 581         path[1] = '\0';
 582         ret = build_dentry_tree_ntfs_recursive(root_p, root_ni, path, 1,
 583                                                lookup_table, &sd_set,
 584                                                config, ntfs_vol_p);
 585 out_cleanup:
 586         FREE(path);
 587         ntfs_inode_close(root_ni);
 588         destroy_sd_set(&sd_set);
 589
 590 out:
 591         if (ret) {
 592                 if (ntfs_umount(vol, FALSE) != 0) {
 593                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'",
 594                                          device);
 595                         if (ret == 0)
 596                                 ret = WIMLIB_ERR_NTFS_3G;
 597                 }
 598         } else {
 599                 *ntfs_vol_p = vol;
 600         }
 601         return ret;
 602 }
 603
 604
 605
 606 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 607                                                 const char *device,
 608                                                 const char *name,
 609                                                 const char *config_str,
 610                                                 size_t config_len,
 611                                                 int flags)
 612 {
 613         if (flags & (WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)) {
 614                 ERROR("Cannot dereference files when capturing directly from NTFS");
 615                 return WIMLIB_ERR_INVALID_PARAM;
 616         }
 617         return do_add_image(w, device, name, config_str, config_len, flags,
 618                             build_dentry_tree_ntfs, &w->ntfs_vol);
 619 }
 620
 621 #else /* WITH_NTFS_3G */
 622 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 623                                                 const char *device,
 624                                                 const char *name,
 625                                                 const char *description,
 626                                                 const char *flags_element,
 627                                                 int flags,
 628                                                 const char *config_str,
 629                                                 size_t config_len)
 630 {
 631         ERROR("wimlib was compiled without support for NTFS-3g, so");
 632         ERROR("we cannot capture a WIM image directly from a NTFS volume");
 633         return WIMLIB_ERR_UNSUPPORTED;
 634 }
 635 #endif /* WITH_NTFS_3G */