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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
  28 #include "config.h"
  29
  30 #ifdef WITH_NTFS_3G
  31 #include <ntfs-3g/endians.h>
  32 #include <ntfs-3g/types.h>
  33 #endif
  34
  35 #include "wimlib_internal.h"
  36
  37
  38 #ifdef WITH_NTFS_3G
  39 #include "dentry.h"
  40 #include "lookup_table.h"
  41 #include "io.h"
  42 #include <ntfs-3g/layout.h>
  43 #include <ntfs-3g/acls.h>
  44 #include <ntfs-3g/attrib.h>
  45 #include <ntfs-3g/misc.h>
  46 #include <ntfs-3g/reparse.h>
  47 #include <ntfs-3g/security.h> /* security.h before xattrs.h */
  48 #include <ntfs-3g/xattrs.h>
  49 #include <ntfs-3g/volume.h>
  50 #include <stdlib.h>
  51 #include <unistd.h>
  52 #include <errno.h>
  53
  54 /* Structure that allows searching the security descriptors by SHA1 message
  55  * digest. */
  56 struct sd_set {
  57         struct wim_security_data *sd;
  58         struct sd_node *root;
  59 };
  60
  61 /* Binary tree node of security descriptors, indexed by the @hash field. */
  62 struct sd_node {
  63         int security_id;
  64         u8 hash[SHA1_HASH_SIZE];
  65         struct sd_node *left;
  66         struct sd_node *right;
  67 };
  68
  69 static void free_sd_tree(struct sd_node *root)
  70 {
  71         if (root) {
  72                 free_sd_tree(root->left);
  73                 free_sd_tree(root->right);
  74                 FREE(root);
  75         }
  76 }
  77 /* Frees a security descriptor index set. */
  78 static void destroy_sd_set(struct sd_set *sd_set)
  79 {
  80         free_sd_tree(sd_set->root);
  81 }
  82
  83 /* Inserts a a new node into the security descriptor index tree. */
  84 static void insert_sd_node(struct sd_node *new, struct sd_node *root)
  85 {
  86         int cmp = hashes_cmp(new->hash, root->hash);
  87         if (cmp < 0) {
  88                 if (root->left)
  89                         insert_sd_node(new, root->left);
  90                 else
  91                         root->left = new;
  92         } else if (cmp > 0) {
  93                 if (root->right)
  94                         insert_sd_node(new, root->right);
  95                 else
  96                         root->right = new;
  97         } else {
  98                 wimlib_assert(0);
  99         }
 100 }
 101
 102 /* Returns the security ID of the security data having a SHA1 message digest of
 103  * @hash in the security descriptor index tree rooted at @root.
 104  *
 105  * If not found, return -1. */
 106 static int lookup_sd(const u8 hash[SHA1_HASH_SIZE], struct sd_node *root)
 107 {
 108         int cmp;
 109         if (!root)
 110                 return -1;
 111         cmp = hashes_cmp(hash, root->hash);
 112         if (cmp < 0)
 113                 return lookup_sd(hash, root->left);
 114         else if (cmp > 0)
 115                 return lookup_sd(hash, root->right);
 116         else
 117                 return root->security_id;
 118 }
 119
 120 /*
 121  * Adds a security descriptor to the indexed security descriptor set as well as
 122  * the corresponding `struct wim_security_data', and returns the new security
 123  * ID; or, if there is an existing security descriptor that is the same, return
 124  * the security ID for it.  If a new security descriptor cannot be allocated,
 125  * return -1.
 126  */
 127 static int sd_set_add_sd(struct sd_set *sd_set, const char descriptor[],
 128                          size_t size)
 129 {
 130         u8 hash[SHA1_HASH_SIZE];
 131         int security_id;
 132         struct sd_node *new;
 133         u8 **descriptors;
 134         u64 *sizes;
 135         u8 *descr_copy;
 136         struct wim_security_data *sd;
 137
 138         sha1_buffer((const u8*)descriptor, size, hash);
 139
 140         security_id = lookup_sd(hash, sd_set->root);
 141         if (security_id >= 0)
 142                 return security_id;
 143
 144         new = MALLOC(sizeof(*new));
 145         if (!new)
 146                 goto out;
 147         descr_copy = MALLOC(size);
 148         if (!descr_copy)
 149                 goto out_free_node;
 150
 151         sd = sd_set->sd;
 152
 153         memcpy(descr_copy, descriptor, size);
 154         new->security_id = sd->num_entries;
 155         new->left = NULL;
 156         new->right = NULL;
 157         copy_hash(new->hash, hash);
 158
 159
 160         descriptors = REALLOC(sd->descriptors,
 161                               (sd->num_entries + 1) * sizeof(sd->descriptors[0]));
 162         if (!descriptors)
 163                 goto out_free_descr;
 164         sd->descriptors = descriptors;
 165         sizes = REALLOC(sd->sizes,
 166                         (sd->num_entries + 1) * sizeof(sd->sizes[0]));
 167         if (!sizes)
 168                 goto out_free_descr;
 169         sd->sizes = sizes;
 170         sd->descriptors[sd->num_entries] = descr_copy;
 171         sd->sizes[sd->num_entries] = size;
 172         sd->num_entries++;
 173         DEBUG("There are now %d security descriptors", sd->num_entries);
 174         sd->total_length += size + sizeof(sd->sizes[0]);
 175
 176         if (sd_set->root)
 177                 insert_sd_node(new, sd_set->root);
 178         else
 179                 sd_set->root = new;
 180         return new->security_id;
 181 out_free_descr:
 182         FREE(descr_copy);
 183 out_free_node:
 184         FREE(new);
 185 out:
 186         return -1;
 187 }
 188
 189 static inline ntfschar *attr_record_name(ATTR_RECORD *ar)
 190 {
 191         return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
 192 }
 193
 194 /* Calculates the SHA1 message digest of a NTFS attribute.
 195  *
 196  * @ni:  The NTFS inode containing the attribute.
 197  * @ar:  The ATTR_RECORD describing the attribute.
 198  * @md:  If successful, the returned SHA1 message digest.
 199  * @reparse_tag_ret:    Optional pointer into which the first 4 bytes of the
 200  *                              attribute will be written (to get the reparse
 201  *                              point ID)
 202  *
 203  * Return 0 on success or nonzero on error.
 204  */
 205 static int ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
 206                              u8 md[SHA1_HASH_SIZE],
 207                              u32 *reparse_tag_ret)
 208 {
 209         s64 pos = 0;
 210         s64 bytes_remaining;
 211         char buf[4096];
 212         ntfs_attr *na;
 213         SHA_CTX ctx;
 214
 215         na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
 216                             ar->name_length);
 217         if (!na) {
 218                 ERROR_WITH_ERRNO("Failed to open NTFS attribute");
 219                 return WIMLIB_ERR_NTFS_3G;
 220         }
 221
 222         bytes_remaining = na->data_size;
 223         sha1_init(&ctx);
 224
 225         DEBUG2("Calculating SHA1 message digest (%"PRIu64" bytes)",
 226                bytes_remaining);
 227
 228         while (bytes_remaining) {
 229                 s64 to_read = min(bytes_remaining, sizeof(buf));
 230                 if (ntfs_attr_pread(na, pos, to_read, buf) != to_read) {
 231                         ERROR_WITH_ERRNO("Error reading NTFS attribute");
 232                         return WIMLIB_ERR_NTFS_3G;
 233                 }
 234                 if (bytes_remaining == na->data_size && reparse_tag_ret)
 235                         *reparse_tag_ret = le32_to_cpu(*(u32*)buf);
 236                 sha1_update(&ctx, buf, to_read);
 237                 pos += to_read;
 238                 bytes_remaining -= to_read;
 239         }
 240         sha1_final(md, &ctx);
 241         ntfs_attr_close(na);
 242         return 0;
 243 }
 244
 245 /* Load the streams from a WIM file or reparse point in the NTFS volume into the
 246  * WIM lookup table */
 247 static int capture_ntfs_streams(struct dentry *dentry, ntfs_inode *ni,
 248                                 char path[], size_t path_len,
 249                                 struct lookup_table *lookup_table,
 250                                 ntfs_volume **ntfs_vol_p,
 251                                 ATTR_TYPES type)
 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                 u32 reparse_tag;
 275                 u64 data_size = ntfs_get_attribute_value_length(actx->attr);
 276                 u64 name_length = actx->attr->name_length;
 277
 278                 if (data_size == 0) {
 279                         if (errno != 0) {
 280                                 ERROR_WITH_ERRNO("Failed to get size of attribute of "
 281                                                  "`%s'", path);
 282                                 ret = WIMLIB_ERR_NTFS_3G;
 283                                 goto out_put_actx;
 284                         }
 285                         /* Empty stream.  No lookup table entry is needed. */
 286                         lte = NULL;
 287                 } else {
 288                         if (type == AT_REPARSE_POINT && data_size < 8) {
 289                                 ERROR("`%s': reparse point buffer too small",
 290                                       path);
 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->d_inode->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's inode. */
 350                         if (dentry->d_inode->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->d_inode->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 = inode_add_ads(dentry->d_inode, 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 *dir_ni,
 410                                  ntfs_inode *ni, char path[], size_t path_len,
 411                                  int name_type,
 412                                  struct lookup_table *lookup_table,
 413                                  struct sd_set *sd_set,
 414                                  const struct capture_config *config,
 415                                  ntfs_volume **ntfs_vol_p,
 416                                  int flags);
 417
 418 static int wim_ntfs_capture_filldir(void *dirent, const ntfschar *name,
 419                                     const int name_len, const int name_type,
 420                                     const s64 pos, const MFT_REF mref,
 421                                     const unsigned dt_type)
 422 {
 423         struct readdir_ctx *ctx;
 424         size_t utf8_name_len;
 425         char *utf8_name;
 426         struct dentry *child = NULL;
 427         int ret;
 428         size_t path_len;
 429
 430         if (name_type == FILE_NAME_DOS)
 431                 return 0;
 432
 433         ret = -1;
 434
 435         utf8_name = utf16_to_utf8((const char*)name, name_len * 2,
 436                                   &utf8_name_len);
 437         if (!utf8_name)
 438                 goto out;
 439
 440         if (utf8_name[0] == '.' &&
 441              (utf8_name[1] == '\0' ||
 442               (utf8_name[1] == '.' && utf8_name[2] == '\0'))) {
 443                 ret = 0;
 444                 goto out_free_utf8_name;
 445         }
 446
 447         ctx = dirent;
 448
 449         ntfs_inode *ni = ntfs_inode_open(ctx->dir_ni->vol, mref);
 450         if (!ni) {
 451                 ERROR_WITH_ERRNO("Failed to open NTFS inode");
 452                 goto out_free_utf8_name;
 453         }
 454         path_len = ctx->path_len;
 455         if (path_len != 1)
 456                 ctx->path[path_len++] = '/';
 457         memcpy(ctx->path + path_len, utf8_name, utf8_name_len + 1);
 458         path_len += utf8_name_len;
 459         ret = build_dentry_tree_ntfs_recursive(&child, ctx->dir_ni,
 460                                                ni, ctx->path, path_len, name_type,
 461                                                ctx->lookup_table, ctx->sd_set,
 462                                                ctx->config, ctx->ntfs_vol_p,
 463                                                ctx->flags);
 464
 465         if (child)
 466                 dentry_add_child(ctx->parent, child);
 467
 468         ntfs_inode_close(ni);
 469 out_free_utf8_name:
 470         FREE(utf8_name);
 471 out:
 472         return ret;
 473 }
 474
 475 static int change_dentry_short_name(struct dentry *dentry,
 476                                     const char short_name_utf8[],
 477                                     int short_name_utf8_len)
 478 {
 479         size_t short_name_utf16_len;
 480         char *short_name_utf16;
 481         short_name_utf16 = utf8_to_utf16(short_name_utf8, short_name_utf8_len,
 482                                          &short_name_utf16_len);
 483         if (!short_name_utf16) {
 484                 ERROR_WITH_ERRNO("Failed to convert short name to UTF-16");
 485                 return WIMLIB_ERR_NOMEM;
 486         }
 487         dentry->short_name = short_name_utf16;
 488         dentry->short_name_len = short_name_utf16_len;
 489         return 0;
 490 }
 491
 492 /* Recursively build a WIM dentry tree corresponding to a NTFS volume.
 493  * At the same time, update the WIM lookup table with lookup table entries for
 494  * the NTFS streams, and build an array of security descriptors.
 495  */
 496 static int build_dentry_tree_ntfs_recursive(struct dentry **root_p,
 497                                             ntfs_inode *dir_ni,
 498                                             ntfs_inode *ni,
 499                                             char path[],
 500                                             size_t path_len,
 501                                             int name_type,
 502                                             struct lookup_table *lookup_table,
 503                                             struct sd_set *sd_set,
 504                                             const struct capture_config *config,
 505                                             ntfs_volume **ntfs_vol_p,
 506                                             int flags)
 507 {
 508         u32 attributes;
 509         int mrec_flags;
 510         int ret;
 511         char dos_name_utf8[64];
 512         struct dentry *root;
 513
 514         mrec_flags = ni->mrec->flags;
 515         struct SECURITY_CONTEXT ctx;
 516         memset(&ctx, 0, sizeof(ctx));
 517         ctx.vol = ni->vol;
 518         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ATTRIB,
 519                                          ni, dir_ni, (char *)&attributes,
 520                                          sizeof(u32));
 521         if (ret != 4) {
 522                 ERROR_WITH_ERRNO("Failed to get NTFS attributes from `%s'",
 523                                  path);
 524                 return WIMLIB_ERR_NTFS_3G;
 525         }
 526
 527         if (exclude_path(path, config, false)) {
 528                 if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE) {
 529                         const char *file_type;
 530                         if (attributes & MFT_RECORD_IS_DIRECTORY)
 531                                 file_type = "directory";
 532                         else
 533                                 file_type = "file";
 534                         printf("Excluding %s `%s' from capture\n",
 535                                file_type, path);
 536                 }
 537                 *root_p = NULL;
 538                 return 0;
 539         }
 540
 541         if (flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 542                 printf("Scanning `%s'\n", path);
 543
 544         root = new_dentry_with_timeless_inode(path_basename(path));
 545         if (!root)
 546                 return WIMLIB_ERR_NOMEM;
 547         *root_p = root;
 548
 549         if (dir_ni && (name_type == FILE_NAME_WIN32_AND_DOS
 550                        || name_type == FILE_NAME_WIN32))
 551         {
 552                 ret = ntfs_get_ntfs_dos_name(ni, dir_ni, dos_name_utf8,
 553                                              sizeof(dos_name_utf8));
 554                 if (ret > 0) {
 555                         DEBUG("Changing short name of `%s'", path);
 556                         ret = change_dentry_short_name(root, dos_name_utf8,
 557                                                        ret);
 558                         if (ret != 0)
 559                                 return ret;
 560                 } else {
 561                 #ifdef ENODATA
 562                         if (errno != ENODATA) {
 563                                 ERROR_WITH_ERRNO("Error getting DOS name "
 564                                                  "of `%s'", path);
 565                                 return WIMLIB_ERR_NTFS_3G;
 566                         }
 567                 #endif
 568                 }
 569         }
 570
 571         root->d_inode->creation_time    = le64_to_cpu(ni->creation_time);
 572         root->d_inode->last_write_time  = le64_to_cpu(ni->last_data_change_time);
 573         root->d_inode->last_access_time = le64_to_cpu(ni->last_access_time);
 574         root->d_inode->attributes       = le32_to_cpu(attributes);
 575         root->d_inode->ino              = ni->mft_no;
 576         root->d_inode->resolved         = true;
 577
 578         if (attributes & FILE_ATTR_REPARSE_POINT) {
 579                 /* Junction point, symbolic link, or other reparse point */
 580                 ret = capture_ntfs_streams(root, ni, path, path_len,
 581                                            lookup_table, ntfs_vol_p,
 582                                            AT_REPARSE_POINT);
 583         } else if (mrec_flags & MFT_RECORD_IS_DIRECTORY) {
 584
 585                 /* Normal directory */
 586                 s64 pos = 0;
 587                 struct readdir_ctx ctx = {
 588                         .parent       = root,
 589                         .dir_ni       = ni,
 590                         .path         = path,
 591                         .path_len     = path_len,
 592                         .lookup_table = lookup_table,
 593                         .sd_set       = sd_set,
 594                         .config       = config,
 595                         .ntfs_vol_p   = ntfs_vol_p,
 596                         .flags        = flags,
 597                 };
 598                 ret = ntfs_readdir(ni, &pos, &ctx, wim_ntfs_capture_filldir);
 599                 if (ret != 0) {
 600                         ERROR_WITH_ERRNO("ntfs_readdir()");
 601                         ret = WIMLIB_ERR_NTFS_3G;
 602                 }
 603         } else {
 604                 /* Normal file */
 605                 ret = capture_ntfs_streams(root, ni, path, path_len,
 606                                            lookup_table, ntfs_vol_p,
 607                                            AT_DATA);
 608         }
 609         if (ret != 0)
 610                 return ret;
 611
 612         char _sd[1];
 613         char *sd = _sd;
 614         errno = 0;
 615         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 616                                          ni, dir_ni, sd,
 617                                          sizeof(sd));
 618         if (ret > sizeof(sd)) {
 619                 sd = alloca(ret);
 620                 ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 621                                                  ni, dir_ni, sd, ret);
 622         }
 623         if (ret > 0) {
 624                 root->d_inode->security_id = sd_set_add_sd(sd_set, sd, ret);
 625                 if (root->d_inode->security_id == -1) {
 626                         ERROR("Out of memory");
 627                         return WIMLIB_ERR_NOMEM;
 628                 }
 629                 DEBUG("Added security ID = %u for `%s'",
 630                       root->d_inode->security_id, path);
 631                 ret = 0;
 632         } else if (ret < 0) {
 633                 ERROR_WITH_ERRNO("Failed to get security information from "
 634                                  "`%s'", path);
 635                 ret = WIMLIB_ERR_NTFS_3G;
 636         } else {
 637                 root->d_inode->security_id = -1;
 638                 DEBUG("No security ID for `%s'", path);
 639         }
 640         return ret;
 641 }
 642
 643 static int build_dentry_tree_ntfs(struct dentry **root_p,
 644                                   const char *device,
 645                                   struct lookup_table *lookup_table,
 646                                   struct wim_security_data *sd,
 647                                   const struct capture_config *config,
 648                                   int flags,
 649                                   void *extra_arg)
 650 {
 651         ntfs_volume *vol;
 652         ntfs_inode *root_ni;
 653         int ret = 0;
 654         struct sd_set sd_set = {
 655                 .sd = sd,
 656                 .root = NULL,
 657         };
 658         ntfs_volume **ntfs_vol_p = extra_arg;
 659
 660         DEBUG("Mounting NTFS volume `%s' read-only", device);
 661
 662         vol = ntfs_mount(device, MS_RDONLY);
 663         if (!vol) {
 664                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 665                                  device);
 666                 return WIMLIB_ERR_NTFS_3G;
 667         }
 668         ntfs_open_secure(vol);
 669
 670         /* We don't want to capture the special NTFS files such as $Bitmap.  Not
 671          * to be confused with "hidden" or "system" files which are real files
 672          * that we do need to capture.  */
 673         NVolClearShowSysFiles(vol);
 674
 675         DEBUG("Opening root NTFS dentry");
 676         root_ni = ntfs_inode_open(vol, FILE_root);
 677         if (!root_ni) {
 678                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 679                                  "`%s'", device);
 680                 ret = WIMLIB_ERR_NTFS_3G;
 681                 goto out;
 682         }
 683
 684         /* Currently we assume that all the UTF-8 paths fit into this length and
 685          * there is no check for overflow. */
 686         char *path = MALLOC(32768);
 687         if (!path) {
 688                 ERROR("Could not allocate memory for NTFS pathname");
 689                 goto out_cleanup;
 690         }
 691
 692         path[0] = '/';
 693         path[1] = '\0';
 694         ret = build_dentry_tree_ntfs_recursive(root_p, NULL, root_ni, path, 1,
 695                                                FILE_NAME_POSIX, lookup_table,
 696                                                &sd_set, config, ntfs_vol_p,
 697                                                flags);
 698 out_cleanup:
 699         FREE(path);
 700         ntfs_inode_close(root_ni);
 701         destroy_sd_set(&sd_set);
 702
 703 out:
 704         if (ret) {
 705                 if (ntfs_umount(vol, FALSE) != 0) {
 706                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'",
 707                                          device);
 708                         if (ret == 0)
 709                                 ret = WIMLIB_ERR_NTFS_3G;
 710                 }
 711         } else {
 712                 /* We need to leave the NTFS volume mounted so that we can read
 713                  * the NTFS files again when we are actually writing the WIM */
 714                 *ntfs_vol_p = vol;
 715         }
 716         return ret;
 717 }
 718
 719
 720
 721 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 722                                                 const char *device,
 723                                                 const char *name,
 724                                                 const char *config_str,
 725                                                 size_t config_len,
 726                                                 int flags)
 727 {
 728         if (flags & (WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)) {
 729                 ERROR("Cannot dereference files when capturing directly from NTFS");
 730                 return WIMLIB_ERR_INVALID_PARAM;
 731         }
 732         return do_add_image(w, device, name, config_str, config_len, flags,
 733                             build_dentry_tree_ntfs, &w->ntfs_vol);
 734 }
 735
 736 #else /* WITH_NTFS_3G */
 737 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 738                                                 const char *device,
 739                                                 const char *name,
 740                                                 const char *config_str,
 741                                                 size_t config_len,
 742                                                 int flags)
 743 {
 744         ERROR("wimlib was compiled without support for NTFS-3g, so");
 745         ERROR("we cannot capture a WIM image directly from a NTFS volume");
 746         return WIMLIB_ERR_UNSUPPORTED;
 747 }
 748 #endif /* WITH_NTFS_3G */