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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.
   6  */
   7
   8 /*
   9  * Copyright (C) 2012 Eric Biggers
  10  *
  11  * This file is part of wimlib, a library for working with WIM files.
  12  *
  13  * wimlib is free software; you can redistribute it and/or modify it under the
  14  * terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 3 of the License, or (at your option)
  16  * any later version.
  17  *
  18  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  19  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  20  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  21  * details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  25  */
  26
  27 #include "config.h"
  28 #include "wimlib_internal.h"
  29
  30
  31 #ifdef WITH_NTFS_3G
  32 #include "dentry.h"
  33 #include "lookup_table.h"
  34 #include "io.h"
  35 #include <ntfs-3g/layout.h>
  36 #include <ntfs-3g/acls.h>
  37 #include <ntfs-3g/attrib.h>
  38 #include <ntfs-3g/misc.h>
  39 #include <ntfs-3g/reparse.h>
  40 #include <ntfs-3g/security.h>
  41 #include <ntfs-3g/volume.h>
  42 #include <stdlib.h>
  43 #include <unistd.h>
  44 #include <errno.h>
  45
  46 #ifndef WITH_NEW_NTFS_3G
  47 extern int ntfs_get_inode_security(ntfs_inode *ni, u32 selection, char *buf,
  48                                    u32 buflen, u32 *psize);
  49
  50 extern u32 ntfs_get_inode_attributes(ntfs_inode *ni);
  51 #endif
  52
  53 /* Structure that allows searching the security descriptors by SHA1 message
  54  * digest. */
  55 struct sd_set {
  56         struct wim_security_data *sd;
  57         struct sd_node *root;
  58 };
  59
  60 /* Binary tree node of security descriptors, indexed by the @hash field. */
  61 struct sd_node {
  62         int security_id;
  63         u8 hash[SHA1_HASH_SIZE];
  64         struct sd_node *left;
  65         struct sd_node *right;
  66 };
  67
  68 static void free_sd_tree(struct sd_node *root)
  69 {
  70         if (root) {
  71                 free_sd_tree(root->left);
  72                 free_sd_tree(root->right);
  73                 FREE(root);
  74         }
  75 }
  76 /* Frees a security descriptor index set. */
  77 static void destroy_sd_set(struct sd_set *sd_set)
  78 {
  79         free_sd_tree(sd_set->root);
  80 }
  81
  82 /* Inserts a a new node into the security descriptor index tree. */
  83 static void insert_sd_node(struct sd_node *new, struct sd_node *root)
  84 {
  85         int cmp = hashes_cmp(new->hash, root->hash);
  86         if (cmp < 0) {
  87                 if (root->left)
  88                         insert_sd_node(new, root->left);
  89                 else
  90                         root->left = new;
  91         } else if (cmp > 0) {
  92                 if (root->right)
  93                         insert_sd_node(new, root->right);
  94                 else
  95                         root->right = new;
  96         } else {
  97                 wimlib_assert(0);
  98         }
  99 }
 100
 101 /* Returns the security ID of the security data having a SHA1 message digest of
 102  * @hash in the security descriptor index tree rooted at @root.
 103  *
 104  * If not found, return -1. */
 105 static int lookup_sd(const u8 hash[SHA1_HASH_SIZE], struct sd_node *root)
 106 {
 107         int cmp;
 108         if (!root)
 109                 return -1;
 110         cmp = hashes_cmp(hash, root->hash);
 111         if (cmp < 0)
 112                 return lookup_sd(hash, root->left);
 113         else if (cmp > 0)
 114                 return lookup_sd(hash, root->right);
 115         else
 116                 return root->security_id;
 117 }
 118
 119 /*
 120  * Adds a security descriptor to the indexed security descriptor set as well as
 121  * the corresponding `struct wim_security_data', and returns the new security
 122  * ID; or, if there is an existing security descriptor that is the same, return
 123  * the security ID for it.  If a new security descriptor cannot be allocated,
 124  * return -1.
 125  */
 126 static int sd_set_add_sd(struct sd_set *sd_set, const char descriptor[],
 127                          size_t size)
 128 {
 129         u8 hash[SHA1_HASH_SIZE];
 130         int security_id;
 131         struct sd_node *new;
 132         u8 **descriptors;
 133         u64 *sizes;
 134         u8 *descr_copy;
 135         struct wim_security_data *sd;
 136
 137         sha1_buffer((const u8*)descriptor, size, hash);
 138
 139         security_id = lookup_sd(hash, sd_set->root);
 140         if (security_id >= 0)
 141                 return security_id;
 142
 143         new = MALLOC(sizeof(*new));
 144         if (!new)
 145                 goto out;
 146         descr_copy = MALLOC(size);
 147         if (!descr_copy)
 148                 goto out_free_node;
 149
 150         sd = sd_set->sd;
 151
 152         memcpy(descr_copy, descriptor, size);
 153         new->security_id = sd->num_entries;
 154         new->left = NULL;
 155         new->right = NULL;
 156         copy_hash(new->hash, hash);
 157
 158
 159         descriptors = REALLOC(sd->descriptors,
 160                               (sd->num_entries + 1) * sizeof(sd->descriptors[0]));
 161         if (!descriptors)
 162                 goto out_free_descr;
 163         sd->descriptors = descriptors;
 164         sizes = REALLOC(sd->sizes,
 165                         (sd->num_entries + 1) * sizeof(sd->sizes[0]));
 166         if (!sizes)
 167                 goto out_free_descr;
 168         sd->sizes = sizes;
 169         sd->descriptors[sd->num_entries] = descr_copy;
 170         sd->sizes[sd->num_entries] = size;
 171         sd->num_entries++;
 172         DEBUG("There are now %d security descriptors", sd->num_entries);
 173         sd->total_length += size + sizeof(sd->sizes[0]);
 174
 175         if (sd_set->root)
 176                 insert_sd_node(new, sd_set->root);
 177         else
 178                 sd_set->root = new;
 179         return new->security_id;
 180 out_free_descr:
 181         FREE(descr_copy);
 182 out_free_node:
 183         FREE(new);
 184 out:
 185         return -1;
 186 }
 187
 188 static inline ntfschar *attr_record_name(ATTR_RECORD *ar)
 189 {
 190         return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
 191 }
 192
 193 /* Calculates the SHA1 message digest of a NTFS attribute.
 194  *
 195  * @ni:  The NTFS inode containing the attribute.
 196  * @ar:  The ATTR_RECORD describing the attribute.
 197  * @md:  If successful, the returned SHA1 message digest.
 198  * @reparse_tag_ret:    Optional pointer into which the first 4 bytes of the
 199  *                              attribute will be written (to get the reparse
 200  *                              point ID)
 201  *
 202  * Return 0 on success or nonzero on error.
 203  */
 204 static int ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
 205                              u8 md[SHA1_HASH_SIZE],
 206                              u32 *reparse_tag_ret)
 207 {
 208         s64 pos = 0;
 209         s64 bytes_remaining;
 210         char buf[4096];
 211         ntfs_attr *na;
 212         SHA_CTX ctx;
 213
 214         na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
 215                             ar->name_length);
 216         if (!na) {
 217                 ERROR_WITH_ERRNO("Failed to open NTFS attribute");
 218                 return WIMLIB_ERR_NTFS_3G;
 219         }
 220
 221         bytes_remaining = na->data_size;
 222         sha1_init(&ctx);
 223
 224         DEBUG2("Calculating SHA1 message digest (%"PRIu64" bytes)",
 225                bytes_remaining);
 226
 227         while (bytes_remaining) {
 228                 s64 to_read = min(bytes_remaining, sizeof(buf));
 229                 if (ntfs_attr_pread(na, pos, to_read, buf) != to_read) {
 230                         ERROR_WITH_ERRNO("Error reading NTFS attribute");
 231                         return WIMLIB_ERR_NTFS_3G;
 232                 }
 233                 if (bytes_remaining == na->data_size && reparse_tag_ret)
 234                         *reparse_tag_ret = le32_to_cpu(*(u32*)buf);
 235                 sha1_update(&ctx, buf, to_read);
 236                 pos += to_read;
 237                 bytes_remaining -= to_read;
 238         }
 239         sha1_final(md, &ctx);
 240         ntfs_attr_close(na);
 241         return 0;
 242 }
 243
 244 /* Load the streams from a WIM file or reparse point in the NTFS volume into the
 245  * WIM lookup table */
 246 static int capture_ntfs_streams(struct dentry *dentry, ntfs_inode *ni,
 247                                 char path[], size_t path_len,
 248                                 struct lookup_table *lookup_table,
 249                                 ntfs_volume **ntfs_vol_p,
 250                                 ATTR_TYPES type)
 251 {
 252
 253         ntfs_attr_search_ctx *actx;
 254         u8 attr_hash[SHA1_HASH_SIZE];
 255         struct ntfs_location *ntfs_loc = NULL;
 256         int ret = 0;
 257         struct lookup_table_entry *lte;
 258
 259         DEBUG2("Capturing NTFS data streams from `%s'", path);
 260
 261         /* Get context to search the streams of the NTFS file. */
 262         actx = ntfs_attr_get_search_ctx(ni, NULL);
 263         if (!actx) {
 264                 ERROR_WITH_ERRNO("Cannot get NTFS attribute search "
 265                                  "context");
 266                 return WIMLIB_ERR_NTFS_3G;
 267         }
 268
 269         /* Capture each data stream or reparse data stream. */
 270         while (!ntfs_attr_lookup(type, NULL, 0,
 271                                  CASE_SENSITIVE, 0, NULL, 0, actx))
 272         {
 273                 char *stream_name_utf8;
 274                 size_t stream_name_utf16_len;
 275                 u32 reparse_tag;
 276                 u64 data_size = ntfs_get_attribute_value_length(actx->attr);
 277                 u64 name_length = actx->attr->name_length;
 278
 279                 if (data_size == 0) {
 280                         if (errno != 0) {
 281                                 ERROR_WITH_ERRNO("Failed to get size of attribute of "
 282                                                  "`%s'", path);
 283                                 ret = WIMLIB_ERR_NTFS_3G;
 284                                 goto out_put_actx;
 285                         }
 286                         /* Empty stream.  No lookup table entry is needed. */
 287                         lte = NULL;
 288                 } else {
 289                         if (type == AT_REPARSE_POINT && data_size < 8) {
 290                                 ERROR("`%s': reparse point buffer too small");
 291                                 ret = WIMLIB_ERR_NTFS_3G;
 292                                 goto out_put_actx;
 293                         }
 294                         /* Checksum the stream. */
 295                         ret = ntfs_attr_sha1sum(ni, actx->attr, attr_hash, &reparse_tag);
 296                         if (ret != 0)
 297                                 goto out_put_actx;
 298
 299                         /* Make a lookup table entry for the stream, or use an existing
 300                          * one if there's already an identical stream. */
 301                         lte = __lookup_resource(lookup_table, attr_hash);
 302                         ret = WIMLIB_ERR_NOMEM;
 303                         if (lte) {
 304                                 lte->refcnt++;
 305                         } else {
 306                                 ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
 307                                 if (!ntfs_loc)
 308                                         goto out_put_actx;
 309                                 ntfs_loc->ntfs_vol_p = ntfs_vol_p;
 310                                 ntfs_loc->path_utf8 = MALLOC(path_len + 1);
 311                                 if (!ntfs_loc->path_utf8)
 312                                         goto out_free_ntfs_loc;
 313                                 memcpy(ntfs_loc->path_utf8, path, path_len + 1);
 314                                 if (name_length) {
 315                                         ntfs_loc->stream_name_utf16 = MALLOC(name_length * 2);
 316                                         if (!ntfs_loc->stream_name_utf16)
 317                                                 goto out_free_ntfs_loc;
 318                                         memcpy(ntfs_loc->stream_name_utf16,
 319                                                attr_record_name(actx->attr),
 320                                                actx->attr->name_length * 2);
 321                                         ntfs_loc->stream_name_utf16_num_chars = name_length;
 322                                 }
 323
 324                                 lte = new_lookup_table_entry();
 325                                 if (!lte)
 326                                         goto out_free_ntfs_loc;
 327                                 lte->ntfs_loc = ntfs_loc;
 328                                 lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
 329                                 if (type == AT_REPARSE_POINT) {
 330                                         dentry->reparse_tag = reparse_tag;
 331                                         ntfs_loc->is_reparse_point = true;
 332                                         lte->resource_entry.original_size = data_size - 8;
 333                                         lte->resource_entry.size = data_size - 8;
 334                                 } else {
 335                                         ntfs_loc->is_reparse_point = false;
 336                                         lte->resource_entry.original_size = data_size;
 337                                         lte->resource_entry.size = data_size;
 338                                 }
 339                                 ntfs_loc = NULL;
 340                                 DEBUG("Add resource for `%s' (size = %zu)",
 341                                       dentry->file_name_utf8,
 342                                       lte->resource_entry.original_size);
 343                                 copy_hash(lte->hash, attr_hash);
 344                                 lookup_table_insert(lookup_table, lte);
 345                         }
 346                 }
 347                 if (name_length == 0) {
 348                         /* Unnamed data stream.  Put the reference to it in the
 349                          * dentry. */
 350                         if (dentry->lte) {
 351                                 ERROR("Found two un-named data streams for "
 352                                       "`%s'", path);
 353                                 ret = WIMLIB_ERR_NTFS_3G;
 354                                 goto out_free_lte;
 355                         }
 356                         dentry->lte = lte;
 357                 } else {
 358                         /* Named data stream.  Put the reference to it in the
 359                          * alternate data stream entries */
 360                         struct ads_entry *new_ads_entry;
 361                         size_t stream_name_utf8_len;
 362                         stream_name_utf8 = utf16_to_utf8((const char*)attr_record_name(actx->attr),
 363                                                          name_length * 2,
 364                                                          &stream_name_utf8_len);
 365                         if (!stream_name_utf8)
 366                                 goto out_free_lte;
 367                         new_ads_entry = dentry_add_ads(dentry, stream_name_utf8);
 368                         FREE(stream_name_utf8);
 369                         if (!new_ads_entry)
 370                                 goto out_free_lte;
 371
 372                         wimlib_assert(new_ads_entry->stream_name_len == name_length * 2);
 373
 374                         new_ads_entry->lte = lte;
 375                 }
 376         }
 377         ret = 0;
 378         goto out_put_actx;
 379 out_free_lte:
 380         free_lookup_table_entry(lte);
 381 out_free_ntfs_loc:
 382         if (ntfs_loc) {
 383                 FREE(ntfs_loc->path_utf8);
 384                 FREE(ntfs_loc->stream_name_utf16);
 385                 FREE(ntfs_loc);
 386         }
 387 out_put_actx:
 388         ntfs_attr_put_search_ctx(actx);
 389         if (ret == 0)
 390                 DEBUG2("Successfully captured NTFS streams from `%s'", path);
 391         else
 392                 ERROR("Failed to capture NTFS streams from `%s", path);
 393         return ret;
 394 }
 395
 396 struct readdir_ctx {
 397         struct dentry       *parent;
 398         ntfs_inode          *dir_ni;
 399         char                *path;
 400         size_t               path_len;
 401         struct lookup_table *lookup_table;
 402         struct sd_set       *sd_set;
 403         const struct capture_config *config;
 404         ntfs_volume        **ntfs_vol_p;
 405         int                  flags;
 406 };
 407
 408 static int
 409 build_dentry_tree_ntfs_recursive(struct dentry **root_p, ntfs_inode *ni,
 410                                  char path[], size_t path_len,
 411                                  struct lookup_table *lookup_table,
 412                                  struct sd_set *sd_set,
 413                                  const struct capture_config *config,
 414                                  ntfs_volume **ntfs_vol_p,
 415                                  int flags);
 416
 417 static int wim_ntfs_capture_filldir(void *dirent, const ntfschar *name,
 418                                     const int name_len, const int name_type,
 419                                     const s64 pos, const MFT_REF mref,
 420                                     const unsigned dt_type)
 421 {
 422         struct readdir_ctx *ctx;
 423         size_t utf8_name_len;
 424         char *utf8_name;
 425         struct dentry *child = NULL;
 426         int ret;
 427         size_t path_len;
 428
 429         if (name_type == FILE_NAME_DOS)
 430                 return 0;
 431
 432         ret = -1;
 433
 434         utf8_name = utf16_to_utf8((const char*)name, name_len * 2,
 435                                   &utf8_name_len);
 436         if (!utf8_name)
 437                 goto out;
 438
 439         if (utf8_name[0] == '.' &&
 440              (utf8_name[1] == '\0' ||
 441               (utf8_name[1] == '.' && utf8_name[2] == '\0'))) {
 442                 ret = 0;
 443                 goto out_free_utf8_name;
 444         }
 445
 446         ctx = dirent;
 447
 448         ntfs_inode *ni = ntfs_inode_open(ctx->dir_ni->vol, mref);
 449         if (!ni) {
 450                 ERROR_WITH_ERRNO("Failed to open NTFS inode");
 451                 ret = 1;
 452         }
 453         path_len = ctx->path_len;
 454         if (path_len != 1)
 455                 ctx->path[path_len++] = '/';
 456         memcpy(ctx->path + path_len, utf8_name, utf8_name_len + 1);
 457         path_len += utf8_name_len;
 458         ret = build_dentry_tree_ntfs_recursive(&child, ni, ctx->path, path_len,
 459                                                ctx->lookup_table, ctx->sd_set,
 460                                                ctx->config, ctx->ntfs_vol_p,
 461                                                ctx->flags);
 462
 463         if (child)
 464                 link_dentry(child, ctx->parent);
 465
 466         ntfs_inode_close(ni);
 467 out_free_utf8_name:
 468         FREE(utf8_name);
 469 out:
 470         return ret;
 471 }
 472
 473 /* Recursively build a WIM dentry tree corresponding to a NTFS volume.
 474  * At the same time, update the WIM lookup table with lookup table entries for
 475  * the NTFS streams, and build an array of security descriptors.
 476  */
 477 static int build_dentry_tree_ntfs_recursive(struct dentry **root_p,
 478                                             ntfs_inode *ni,
 479                                             char path[],
 480                                             size_t path_len,
 481                                             struct lookup_table *lookup_table,
 482                                             struct sd_set *sd_set,
 483                                             const struct capture_config *config,
 484                                             ntfs_volume **ntfs_vol_p,
 485                                             int flags)
 486 {
 487         u32 attributes;
 488         int mrec_flags;
 489         u32 sd_size = 0;
 490         int ret = 0;
 491         struct dentry *root;
 492
 493         mrec_flags = ni->mrec->flags;
 494         attributes = ntfs_get_inode_attributes(ni);
 495
 496         if (exclude_path(path, config, false)) {
 497                 if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE) {
 498                         const char *file_type;
 499                         if (attributes & MFT_RECORD_IS_DIRECTORY)
 500                                 file_type = "directory";
 501                         else
 502                                 file_type = "file";
 503                         printf("Excluding %s `%s' from capture\n",
 504                                file_type, path);
 505                 }
 506                 *root_p = NULL;
 507                 return 0;
 508         }
 509
 510         if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 511                 printf("Scanning `%s'\n", path);
 512
 513         root = new_dentry(path_basename(path));
 514         if (!root)
 515                 return WIMLIB_ERR_NOMEM;
 516
 517         *root_p = root;
 518         root->creation_time    = le64_to_cpu(ni->creation_time);
 519         root->last_write_time  = le64_to_cpu(ni->last_data_change_time);
 520         root->last_access_time = le64_to_cpu(ni->last_access_time);
 521         root->attributes       = le32_to_cpu(attributes);
 522         root->link_group_id    = ni->mft_no;
 523         root->resolved         = true;
 524
 525         if (attributes & FILE_ATTR_REPARSE_POINT) {
 526                 /* Junction point, symbolic link, or other reparse point */
 527                 ret = capture_ntfs_streams(root, ni, path, path_len,
 528                                            lookup_table, ntfs_vol_p,
 529                                            AT_REPARSE_POINT);
 530         } else if (mrec_flags & MFT_RECORD_IS_DIRECTORY) {
 531
 532                 /* Normal directory */
 533                 s64 pos = 0;
 534                 struct readdir_ctx ctx = {
 535                         .parent       = root,
 536                         .dir_ni       = ni,
 537                         .path         = path,
 538                         .path_len     = path_len,
 539                         .lookup_table = lookup_table,
 540                         .sd_set       = sd_set,
 541                         .config       = config,
 542                         .ntfs_vol_p   = ntfs_vol_p,
 543                         .flags        = flags,
 544                 };
 545                 ret = ntfs_readdir(ni, &pos, &ctx, wim_ntfs_capture_filldir);
 546                 if (ret != 0) {
 547                         ERROR_WITH_ERRNO("ntfs_readdir()");
 548                         ret = WIMLIB_ERR_NTFS_3G;
 549                 }
 550         } else {
 551                 /* Normal file */
 552                 ret = capture_ntfs_streams(root, ni, path, path_len,
 553                                            lookup_table, ntfs_vol_p,
 554                                            AT_DATA);
 555         }
 556         if (ret != 0)
 557                 return ret;
 558
 559         ret = ntfs_get_inode_security(ni,
 560                                       OWNER_SECURITY_INFORMATION |
 561                                       GROUP_SECURITY_INFORMATION |
 562                                       DACL_SECURITY_INFORMATION  |
 563                                       SACL_SECURITY_INFORMATION,
 564                                       NULL, 0, &sd_size);
 565         char sd[sd_size];
 566         ret = ntfs_get_inode_security(ni,
 567                                       OWNER_SECURITY_INFORMATION |
 568                                       GROUP_SECURITY_INFORMATION |
 569                                       DACL_SECURITY_INFORMATION  |
 570                                       SACL_SECURITY_INFORMATION,
 571                                       sd, sd_size, &sd_size);
 572         if (ret == 0) {
 573                 ERROR_WITH_ERRNO("Failed to get security information from "
 574                                  "`%s'", path);
 575                 ret = WIMLIB_ERR_NTFS_3G;
 576         } else {
 577                 if (ret > 0) {
 578                         /*print_security_descriptor(sd, sd_size);*/
 579                         root->security_id = sd_set_add_sd(sd_set, sd, sd_size);
 580                         if (root->security_id == -1) {
 581                                 ERROR("Out of memory");
 582                                 return WIMLIB_ERR_NOMEM;
 583                         }
 584                         DEBUG("Added security ID = %u for `%s'",
 585                               root->security_id, path);
 586                 } else {
 587                         root->security_id = -1;
 588                         DEBUG("No security ID for `%s'", path);
 589                 }
 590                 ret = 0;
 591         }
 592         return ret;
 593 }
 594
 595 static int build_dentry_tree_ntfs(struct dentry **root_p,
 596                                   const char *device,
 597                                   struct lookup_table *lookup_table,
 598                                   struct wim_security_data *sd,
 599                                   const struct capture_config *config,
 600                                   int flags,
 601                                   void *extra_arg)
 602 {
 603         ntfs_volume *vol;
 604         ntfs_inode *root_ni;
 605         int ret = 0;
 606         struct sd_set sd_set = {
 607                 .sd = sd,
 608                 .root = NULL,
 609         };
 610         ntfs_volume **ntfs_vol_p = extra_arg;
 611
 612         DEBUG("Mounting NTFS volume `%s' read-only", device);
 613
 614         vol = ntfs_mount(device, MS_RDONLY);
 615         if (!vol) {
 616                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 617                                  device);
 618                 return WIMLIB_ERR_NTFS_3G;
 619         }
 620         ntfs_open_secure(vol);
 621
 622         /* We don't want to capture the special NTFS files such as $Bitmap.  Not
 623          * to be confused with "hidden" or "system" files which are real files
 624          * that we do need to capture.  */
 625         NVolClearShowSysFiles(vol);
 626
 627         DEBUG("Opening root NTFS dentry");
 628         root_ni = ntfs_inode_open(vol, FILE_root);
 629         if (!root_ni) {
 630                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 631                                  "`%s'", device);
 632                 ret = WIMLIB_ERR_NTFS_3G;
 633                 goto out;
 634         }
 635
 636         /* Currently we assume that all the UTF-8 paths fit into this length and
 637          * there is no check for overflow. */
 638         char *path = MALLOC(32768);
 639         if (!path) {
 640                 ERROR("Could not allocate memory for NTFS pathname");
 641                 goto out_cleanup;
 642         }
 643
 644         path[0] = '/';
 645         path[1] = '\0';
 646         ret = build_dentry_tree_ntfs_recursive(root_p, root_ni, path, 1,
 647                                                lookup_table, &sd_set,
 648                                                config, ntfs_vol_p, flags);
 649 out_cleanup:
 650         FREE(path);
 651         ntfs_inode_close(root_ni);
 652         destroy_sd_set(&sd_set);
 653
 654 out:
 655         if (ret) {
 656                 if (ntfs_umount(vol, FALSE) != 0) {
 657                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'",
 658                                          device);
 659                         if (ret == 0)
 660                                 ret = WIMLIB_ERR_NTFS_3G;
 661                 }
 662         } else {
 663                 /* We need to leave the NTFS volume mounted so that we can read
 664                  * the NTFS files again when we are actually writing the WIM */
 665                 *ntfs_vol_p = vol;
 666         }
 667         return ret;
 668 }
 669
 670
 671
 672 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 673                                                 const char *device,
 674                                                 const char *name,
 675                                                 const char *config_str,
 676                                                 size_t config_len,
 677                                                 int flags)
 678 {
 679         if (flags & (WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)) {
 680                 ERROR("Cannot dereference files when capturing directly from NTFS");
 681                 return WIMLIB_ERR_INVALID_PARAM;
 682         }
 683         return do_add_image(w, device, name, config_str, config_len, flags,
 684                             build_dentry_tree_ntfs, &w->ntfs_vol);
 685 }
 686
 687 #else /* WITH_NTFS_3G */
 688 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 689                                                 const char *device,
 690                                                 const char *name,
 691                                                 const char *config_str,
 692                                                 size_t config_len,
 693                                                 int flags)
 694 {
 695         ERROR("wimlib was compiled without support for NTFS-3g, so");
 696         ERROR("we cannot capture a WIM image directly from a NTFS volume");
 697         return WIMLIB_ERR_UNSUPPORTED;
 698 }
 699 #endif /* WITH_NTFS_3G */