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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, 2013 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 #include <ntfs-3g/endians.h>
  31 #include <ntfs-3g/types.h>
  32
  33 #include "buffer_io.h"
  34 #include "dentry.h"
  35 #include "lookup_table.h"
  36 #include "security.h"
  37 #include "wimlib_internal.h"
  38
  39 #include <ntfs-3g/layout.h>
  40 #include <ntfs-3g/acls.h>
  41 #include <ntfs-3g/attrib.h>
  42 #include <ntfs-3g/misc.h>
  43 #include <ntfs-3g/reparse.h>
  44 #include <ntfs-3g/security.h> /* ntfs-3g/security.h before ntfs-3g/xattrs.h */
  45 #include <ntfs-3g/xattrs.h>
  46 #include <ntfs-3g/volume.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49 #include <errno.h>
  50
  51 #ifdef HAVE_ALLOCA_H
  52 #include <alloca.h>
  53 #endif
  54
  55 static inline ntfschar *attr_record_name(ATTR_RECORD *ar)
  56 {
  57         return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
  58 }
  59
  60 /* Calculates the SHA1 message digest of a NTFS attribute.
  61  *
  62  * @ni:  The NTFS inode containing the attribute.
  63  * @ar:  The ATTR_RECORD describing the attribute.
  64  * @md:  If successful, the returned SHA1 message digest.
  65  * @reparse_tag_ret:    Optional pointer into which the first 4 bytes of the
  66  *                              attribute will be written (to get the reparse
  67  *                              point ID)
  68  *
  69  * Return 0 on success or nonzero on error.
  70  */
  71 static int ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
  72                              u8 md[SHA1_HASH_SIZE],
  73                              bool is_reparse_point,
  74                              u32 *reparse_tag_ret)
  75 {
  76         s64 pos = 0;
  77         s64 bytes_remaining;
  78         char buf[BUFFER_SIZE];
  79         ntfs_attr *na;
  80         SHA_CTX ctx;
  81
  82         na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
  83                             ar->name_length);
  84         if (!na) {
  85                 ERROR_WITH_ERRNO("Failed to open NTFS attribute");
  86                 return WIMLIB_ERR_NTFS_3G;
  87         }
  88
  89         bytes_remaining = na->data_size;
  90
  91         if (is_reparse_point) {
  92                 if (ntfs_attr_pread(na, 0, 8, buf) != 8)
  93                         goto out_error;
  94                 *reparse_tag_ret = le32_to_cpu(*(u32*)buf);
  95                 DEBUG("ReparseTag = %#x", *reparse_tag_ret);
  96                 pos = 8;
  97                 bytes_remaining -= 8;
  98         }
  99
 100         sha1_init(&ctx);
 101         while (bytes_remaining) {
 102                 s64 to_read = min(bytes_remaining, sizeof(buf));
 103                 if (ntfs_attr_pread(na, pos, to_read, buf) != to_read)
 104                         goto out_error;
 105                 sha1_update(&ctx, buf, to_read);
 106                 pos += to_read;
 107                 bytes_remaining -= to_read;
 108         }
 109         sha1_final(md, &ctx);
 110         ntfs_attr_close(na);
 111         return 0;
 112 out_error:
 113         ERROR_WITH_ERRNO("Error reading NTFS attribute");
 114         return WIMLIB_ERR_NTFS_3G;
 115 }
 116
 117 /* Load the streams from a file or reparse point in the NTFS volume into the WIM
 118  * lookup table */
 119 static int capture_ntfs_streams(struct wim_dentry *dentry, ntfs_inode *ni,
 120                                 char path[], size_t path_len,
 121                                 struct wim_lookup_table *lookup_table,
 122                                 ntfs_volume **ntfs_vol_p,
 123                                 ATTR_TYPES type)
 124 {
 125         ntfs_attr_search_ctx *actx;
 126         u8 attr_hash[SHA1_HASH_SIZE];
 127         struct ntfs_location *ntfs_loc = NULL;
 128         int ret = 0;
 129         struct wim_lookup_table_entry *lte;
 130
 131         DEBUG2("Capturing NTFS data streams from `%s'", path);
 132
 133         /* Get context to search the streams of the NTFS file. */
 134         actx = ntfs_attr_get_search_ctx(ni, NULL);
 135         if (!actx) {
 136                 ERROR_WITH_ERRNO("Cannot get NTFS attribute search "
 137                                  "context");
 138                 return WIMLIB_ERR_NTFS_3G;
 139         }
 140
 141         /* Capture each data stream or reparse data stream. */
 142         while (!ntfs_attr_lookup(type, NULL, 0,
 143                                  CASE_SENSITIVE, 0, NULL, 0, actx))
 144         {
 145                 char *stream_name_utf8;
 146                 u32 reparse_tag;
 147                 u64 data_size = ntfs_get_attribute_value_length(actx->attr);
 148                 u64 name_length = actx->attr->name_length;
 149
 150                 if (data_size == 0) {
 151                         if (errno != 0) {
 152                                 ERROR_WITH_ERRNO("Failed to get size of attribute of "
 153                                                  "`%s'", path);
 154                                 ret = WIMLIB_ERR_NTFS_3G;
 155                                 goto out_put_actx;
 156                         }
 157                         /* Empty stream.  No lookup table entry is needed. */
 158                         lte = NULL;
 159                 } else {
 160                         if (type == AT_REPARSE_POINT && data_size < 8) {
 161                                 ERROR("`%s': reparse point buffer too small",
 162                                       path);
 163                                 ret = WIMLIB_ERR_NTFS_3G;
 164                                 goto out_put_actx;
 165                         }
 166                         /* Checksum the stream. */
 167                         ret = ntfs_attr_sha1sum(ni, actx->attr, attr_hash,
 168                                                 type == AT_REPARSE_POINT, &reparse_tag);
 169                         if (ret != 0)
 170                                 goto out_put_actx;
 171
 172                         if (type == AT_REPARSE_POINT)
 173                                 dentry->d_inode->i_reparse_tag = reparse_tag;
 174
 175                         /* Make a lookup table entry for the stream, or use an existing
 176                          * one if there's already an identical stream. */
 177                         lte = __lookup_resource(lookup_table, attr_hash);
 178                         ret = WIMLIB_ERR_NOMEM;
 179                         if (lte) {
 180                                 lte->refcnt++;
 181                         } else {
 182                                 ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
 183                                 if (!ntfs_loc)
 184                                         goto out_put_actx;
 185                                 ntfs_loc->ntfs_vol_p = ntfs_vol_p;
 186                                 ntfs_loc->path_utf8 = MALLOC(path_len + 1);
 187                                 if (!ntfs_loc->path_utf8)
 188                                         goto out_free_ntfs_loc;
 189                                 memcpy(ntfs_loc->path_utf8, path, path_len + 1);
 190                                 if (name_length) {
 191                                         ntfs_loc->stream_name_utf16 = MALLOC(name_length * 2);
 192                                         if (!ntfs_loc->stream_name_utf16)
 193                                                 goto out_free_ntfs_loc;
 194                                         memcpy(ntfs_loc->stream_name_utf16,
 195                                                attr_record_name(actx->attr),
 196                                                actx->attr->name_length * 2);
 197                                         ntfs_loc->stream_name_utf16_num_chars = name_length;
 198                                 }
 199
 200                                 lte = new_lookup_table_entry();
 201                                 if (!lte)
 202                                         goto out_free_ntfs_loc;
 203                                 lte->ntfs_loc = ntfs_loc;
 204                                 lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
 205                                 if (type == AT_REPARSE_POINT) {
 206                                         ntfs_loc->is_reparse_point = true;
 207                                         lte->resource_entry.original_size = data_size - 8;
 208                                         lte->resource_entry.size = data_size - 8;
 209                                 } else {
 210                                         ntfs_loc->is_reparse_point = false;
 211                                         lte->resource_entry.original_size = data_size;
 212                                         lte->resource_entry.size = data_size;
 213                                 }
 214                                 ntfs_loc = NULL;
 215                                 DEBUG("Add resource for `%s' (size = %"PRIu64")",
 216                                       dentry->file_name_utf8,
 217                                       lte->resource_entry.original_size);
 218                                 copy_hash(lte->hash, attr_hash);
 219                                 lookup_table_insert(lookup_table, lte);
 220                         }
 221                 }
 222                 if (name_length == 0) {
 223                         /* Unnamed data stream.  Put the reference to it in the
 224                          * dentry's inode. */
 225                 #if 0
 226                         if (dentry->d_inode->i_lte) {
 227                                 ERROR("Found two un-named data streams for "
 228                                       "`%s'", path);
 229                                 ret = WIMLIB_ERR_NTFS_3G;
 230                                 goto out_free_lte;
 231                         }
 232                         dentry->d_inode->i_lte = lte;
 233                 #else
 234                         if (dentry->d_inode->i_lte) {
 235                                 WARNING("Found two un-named data streams for "
 236                                         "`%s'", path);
 237                                 free_lookup_table_entry(lte);
 238                         } else {
 239                                 dentry->d_inode->i_lte = lte;
 240                         }
 241                 #endif
 242                 } else {
 243                         /* Named data stream.  Put the reference to it in the
 244                          * alternate data stream entries */
 245                         struct wim_ads_entry *new_ads_entry;
 246                         size_t stream_name_utf8_len;
 247
 248                         ret = utf16_to_utf8((const char*)attr_record_name(actx->attr),
 249                                             name_length * 2,
 250                                             &stream_name_utf8,
 251                                             &stream_name_utf8_len);
 252                         if (ret != 0)
 253                                 goto out_free_lte;
 254                         new_ads_entry = inode_add_ads(dentry->d_inode, stream_name_utf8);
 255                         FREE(stream_name_utf8);
 256                         if (!new_ads_entry)
 257                                 goto out_free_lte;
 258
 259                         wimlib_assert(new_ads_entry->stream_name_len == name_length * 2);
 260
 261                         new_ads_entry->lte = lte;
 262                 }
 263         }
 264         ret = 0;
 265         goto out_put_actx;
 266 out_free_lte:
 267         free_lookup_table_entry(lte);
 268 out_free_ntfs_loc:
 269         if (ntfs_loc) {
 270                 FREE(ntfs_loc->path_utf8);
 271                 FREE(ntfs_loc->stream_name_utf16);
 272                 FREE(ntfs_loc);
 273         }
 274 out_put_actx:
 275         ntfs_attr_put_search_ctx(actx);
 276         if (ret == 0)
 277                 DEBUG2("Successfully captured NTFS streams from `%s'", path);
 278         else
 279                 ERROR("Failed to capture NTFS streams from `%s", path);
 280         return ret;
 281 }
 282
 283 /* Red-black tree that maps NTFS inode numbers to DOS names */
 284 struct dos_name_map {
 285         struct rb_root rb_root;
 286 };
 287
 288 struct dos_name_node {
 289         struct rb_node rb_node;
 290         char dos_name[24];
 291         int name_len_bytes;
 292         u64 ntfs_ino;
 293 };
 294
 295 /* Inserts a new DOS name into the map */
 296 static int insert_dos_name(struct dos_name_map *map,
 297                            const ntfschar *dos_name, int name_len,
 298                            u64 ntfs_ino)
 299 {
 300         struct dos_name_node *new_node;
 301         struct rb_node **p;
 302         struct rb_root *root;
 303         struct rb_node *rb_parent;
 304
 305         DEBUG("DOS name_len = %d", name_len);
 306         new_node = MALLOC(sizeof(struct dos_name_node));
 307         if (!new_node)
 308                 return -1;
 309
 310         /* DOS names are supposed to be 12 characters max (that's 24 bytes,
 311          * assuming 2-byte ntfs characters) */
 312         wimlib_assert(name_len * sizeof(ntfschar) <= sizeof(new_node->dos_name));
 313
 314         /* Initialize the DOS name, DOS name length, and NTFS inode number of
 315          * the red-black tree node */
 316         memcpy(new_node->dos_name, dos_name, name_len * sizeof(ntfschar));
 317         new_node->name_len_bytes = name_len * sizeof(ntfschar);
 318         new_node->ntfs_ino = ntfs_ino;
 319
 320         /* Insert the red-black tree node */
 321         root = &map->rb_root;
 322         p = &root->rb_node;
 323         rb_parent = NULL;
 324         while (*p) {
 325                 struct dos_name_node *this;
 326
 327                 this = container_of(*p, struct dos_name_node, rb_node);
 328                 rb_parent = *p;
 329                 if (new_node->ntfs_ino < this->ntfs_ino)
 330                         p = &((*p)->rb_left);
 331                 else if (new_node->ntfs_ino > this->ntfs_ino)
 332                         p = &((*p)->rb_right);
 333                 else {
 334                         /* This should be impossible since a NTFS inode cannot
 335                          * have multiple DOS names, and we only should get each
 336                          * DOS name entry once from the ntfs_readdir() calls. */
 337                         ERROR("NTFS inode %"PRIu64" has multiple DOS names",
 338                               ntfs_ino);
 339                         return -1;
 340                 }
 341         }
 342         rb_link_node(&new_node->rb_node, rb_parent, p);
 343         rb_insert_color(&new_node->rb_node, root);
 344         DEBUG("Inserted DOS name for inode %"PRIu64, ntfs_ino);
 345         return 0;
 346 }
 347
 348 /* Returns a structure that contains the DOS name and its length for a NTFS
 349  * inode, or NULL if the inode has no DOS name. */
 350 static struct dos_name_node *
 351 lookup_dos_name(const struct dos_name_map *map, u64 ntfs_ino)
 352 {
 353         struct rb_node *node = map->rb_root.rb_node;
 354         while (node) {
 355                 struct dos_name_node *this;
 356                 this = container_of(node, struct dos_name_node, rb_node);
 357                 if (ntfs_ino < this->ntfs_ino)
 358                         node = node->rb_left;
 359                 else if (ntfs_ino > this->ntfs_ino)
 360                         node = node->rb_right;
 361                 else
 362                         return this;
 363         }
 364         return NULL;
 365 }
 366
 367 static int set_dentry_dos_name(struct wim_dentry *dentry, void *arg)
 368 {
 369         const struct dos_name_map *map = arg;
 370         const struct dos_name_node *node;
 371
 372         if (dentry->is_win32_name) {
 373                 node = lookup_dos_name(map, dentry->d_inode->i_ino);
 374                 if (node) {
 375                         dentry->short_name = MALLOC(node->name_len_bytes);
 376                         if (!dentry->short_name)
 377                                 return WIMLIB_ERR_NOMEM;
 378                         memcpy(dentry->short_name, node->dos_name,
 379                                node->name_len_bytes);
 380                         dentry->short_name_len = node->name_len_bytes;
 381                         DEBUG("Assigned DOS name to ino %"PRIu64,
 382                               dentry->d_inode->i_ino);
 383                 } else {
 384                         WARNING("NTFS inode %"PRIu64" has Win32 name with no "
 385                                 "corresponding DOS name",
 386                                 dentry->d_inode->i_ino);
 387                 }
 388         }
 389         return 0;
 390 }
 391
 392 static void free_dos_name_tree(struct rb_node *node) {
 393         if (node) {
 394                 free_dos_name_tree(node->rb_left);
 395                 free_dos_name_tree(node->rb_right);
 396                 FREE(container_of(node, struct dos_name_node, rb_node));
 397         }
 398 }
 399
 400 static void destroy_dos_name_map(struct dos_name_map *map)
 401 {
 402         free_dos_name_tree(map->rb_root.rb_node);
 403 }
 404
 405 struct readdir_ctx {
 406         struct wim_dentry *parent;
 407         ntfs_inode *dir_ni;
 408         char *path;
 409         size_t path_len;
 410         struct wim_lookup_table *lookup_table;
 411         struct sd_set *sd_set;
 412         struct dos_name_map *dos_name_map;
 413         const struct capture_config *config;
 414         ntfs_volume **ntfs_vol_p;
 415         int add_image_flags;
 416         wimlib_progress_func_t progress_func;
 417 };
 418
 419 static int
 420 build_dentry_tree_ntfs_recursive(struct wim_dentry **root_p, ntfs_inode *dir_ni,
 421                                  ntfs_inode *ni, char path[], size_t path_len,
 422                                  int name_type,
 423                                  struct wim_lookup_table *lookup_table,
 424                                  struct sd_set *sd_set,
 425                                  const struct capture_config *config,
 426                                  ntfs_volume **ntfs_vol_p,
 427                                  int add_image_flags,
 428                                  wimlib_progress_func_t progress_func);
 429
 430 static int wim_ntfs_capture_filldir(void *dirent, const ntfschar *name,
 431                                     const int name_len, const int name_type,
 432                                     const s64 pos, const MFT_REF mref,
 433                                     const unsigned dt_type)
 434 {
 435         struct readdir_ctx *ctx;
 436         size_t utf8_name_len;
 437         char *utf8_name;
 438         struct wim_dentry *child;
 439         int ret;
 440         size_t path_len;
 441
 442         ctx = dirent;
 443         if (name_type & FILE_NAME_DOS) {
 444                 /* If this is the entry for a DOS name, store it for later. */
 445                 ret = insert_dos_name(ctx->dos_name_map, name,
 446                                       name_len, mref & MFT_REF_MASK_CPU);
 447
 448                 /* Return now if an error occurred or if this is just a DOS name
 449                  * and not a Win32+DOS name. */
 450                 if (ret != 0 || name_type == FILE_NAME_DOS)
 451                         return ret;
 452         }
 453         ret = utf16_to_utf8((const char*)name, name_len * 2,
 454                             &utf8_name, &utf8_name_len);
 455         if (ret != 0)
 456                 return -1;
 457
 458         if (utf8_name[0] == '.' &&
 459              (utf8_name[1] == '\0' ||
 460               (utf8_name[1] == '.' && utf8_name[2] == '\0'))) {
 461                 /* . or .. entries
 462                  *
 463                  * note: name_type is POSIX for these, so DOS names will not
 464                  * have been inserted for them.  */
 465                 ret = 0;
 466                 goto out_free_utf8_name;
 467         }
 468
 469         /* Open the inode for this directory entry and recursively capture the
 470          * directory tree rooted at it */
 471         ntfs_inode *ni = ntfs_inode_open(ctx->dir_ni->vol, mref);
 472         if (!ni) {
 473                 ERROR_WITH_ERRNO("Failed to open NTFS inode");
 474                 goto out_free_utf8_name;
 475         }
 476         path_len = ctx->path_len;
 477         if (path_len != 1)
 478                 ctx->path[path_len++] = '/';
 479         memcpy(ctx->path + path_len, utf8_name, utf8_name_len + 1);
 480         path_len += utf8_name_len;
 481         child = NULL;
 482         ret = build_dentry_tree_ntfs_recursive(&child, ctx->dir_ni,
 483                                                ni, ctx->path, path_len, name_type,
 484                                                ctx->lookup_table, ctx->sd_set,
 485                                                ctx->config, ctx->ntfs_vol_p,
 486                                                ctx->add_image_flags,
 487                                                ctx->progress_func);
 488         if (child)
 489                 dentry_add_child(ctx->parent, child);
 490         ntfs_inode_close(ni);
 491 out_free_utf8_name:
 492         FREE(utf8_name);
 493         return ret;
 494 }
 495
 496 /* Recursively build a WIM dentry tree corresponding to a NTFS volume.
 497  * At the same time, update the WIM lookup table with lookup table entries for
 498  * the NTFS streams, and build an array of security descriptors.
 499  */
 500 static int build_dentry_tree_ntfs_recursive(struct wim_dentry **root_p,
 501                                             ntfs_inode *dir_ni,
 502                                             ntfs_inode *ni,
 503                                             char path[],
 504                                             size_t path_len,
 505                                             int name_type,
 506                                             struct wim_lookup_table *lookup_table,
 507                                             struct sd_set *sd_set,
 508                                             const struct capture_config *config,
 509                                             ntfs_volume **ntfs_vol_p,
 510                                             int add_image_flags,
 511                                             wimlib_progress_func_t progress_func)
 512 {
 513         u32 attributes;
 514         int ret;
 515         struct wim_dentry *root;
 516
 517         if (exclude_path(path, config, false)) {
 518                 /* Exclude a file or directory tree based on the capture
 519                  * configuration file */
 520                 if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 521                     && progress_func)
 522                 {
 523                         union wimlib_progress_info info;
 524                         info.scan.cur_path = path;
 525                         info.scan.excluded = true;
 526                         progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 527                 }
 528                 *root_p = NULL;
 529                 return 0;
 530         }
 531
 532         /* Get file attributes */
 533         struct SECURITY_CONTEXT ctx;
 534         memset(&ctx, 0, sizeof(ctx));
 535         ctx.vol = ni->vol;
 536         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ATTRIB,
 537                                          ni, dir_ni, (char *)&attributes,
 538                                          sizeof(u32));
 539         if (ret != 4) {
 540                 ERROR_WITH_ERRNO("Failed to get NTFS attributes from `%s'",
 541                                  path);
 542                 return WIMLIB_ERR_NTFS_3G;
 543         }
 544
 545         if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 546             && progress_func)
 547         {
 548                 union wimlib_progress_info info;
 549                 info.scan.cur_path = path;
 550                 info.scan.excluded = false;
 551                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 552         }
 553
 554         /* Create the new WIM dentry */
 555         root = new_dentry_with_timeless_inode(path_basename(path));
 556         if (!root) {
 557                 if (errno == EILSEQ)
 558                         return WIMLIB_ERR_INVALID_UTF8_STRING;
 559                 else if (errno == ENOMEM)
 560                         return WIMLIB_ERR_NOMEM;
 561                 else
 562                         return WIMLIB_ERR_ICONV_NOT_AVAILABLE;
 563         }
 564         *root_p = root;
 565
 566         if (name_type & FILE_NAME_WIN32) /* Win32 or Win32+DOS name */
 567                 root->is_win32_name = 1;
 568         root->d_inode->i_creation_time    = le64_to_cpu(ni->creation_time);
 569         root->d_inode->i_last_write_time  = le64_to_cpu(ni->last_data_change_time);
 570         root->d_inode->i_last_access_time = le64_to_cpu(ni->last_access_time);
 571         root->d_inode->i_attributes       = le32_to_cpu(attributes);
 572         root->d_inode->i_ino              = ni->mft_no;
 573         root->d_inode->i_resolved         = 1;
 574
 575         if (attributes & FILE_ATTR_REPARSE_POINT) {
 576                 /* Junction point, symbolic link, or other reparse point */
 577                 ret = capture_ntfs_streams(root, ni, path, path_len,
 578                                            lookup_table, ntfs_vol_p,
 579                                            AT_REPARSE_POINT);
 580         } else if (ni->mrec->flags & MFT_RECORD_IS_DIRECTORY) {
 581
 582                 /* Normal directory */
 583                 s64 pos = 0;
 584                 struct dos_name_map dos_name_map = { .rb_root = {.rb_node = NULL} };
 585                 struct readdir_ctx ctx = {
 586                         .parent          = root,
 587                         .dir_ni          = ni,
 588                         .path            = path,
 589                         .path_len        = path_len,
 590                         .lookup_table    = lookup_table,
 591                         .sd_set          = sd_set,
 592                         .dos_name_map    = &dos_name_map,
 593                         .config          = config,
 594                         .ntfs_vol_p      = ntfs_vol_p,
 595                         .add_image_flags = add_image_flags,
 596                         .progress_func   = progress_func,
 597                 };
 598                 ret = ntfs_readdir(ni, &pos, &ctx, wim_ntfs_capture_filldir);
 599                 if (ret) {
 600                         ERROR_WITH_ERRNO("ntfs_readdir()");
 601                         ret = WIMLIB_ERR_NTFS_3G;
 602                 } else {
 603                         ret = for_dentry_child(root, set_dentry_dos_name,
 604                                                &dos_name_map);
 605                 }
 606                 destroy_dos_name_map(&dos_name_map);
 607         } else {
 608                 /* Normal file */
 609                 ret = capture_ntfs_streams(root, ni, path, path_len,
 610                                            lookup_table, ntfs_vol_p,
 611                                            AT_DATA);
 612         }
 613         if (ret != 0)
 614                 return ret;
 615
 616         /* Get security descriptor */
 617         char _sd[1];
 618         char *sd = _sd;
 619         errno = 0;
 620         ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 621                                          ni, dir_ni, sd,
 622                                          sizeof(sd));
 623         if (ret > sizeof(sd)) {
 624                 sd = alloca(ret);
 625                 ret = ntfs_xattr_system_getxattr(&ctx, XATTR_NTFS_ACL,
 626                                                  ni, dir_ni, sd, ret);
 627         }
 628         if (ret > 0) {
 629                 root->d_inode->i_security_id = sd_set_add_sd(sd_set, sd, ret);
 630                 if (root->d_inode->i_security_id == -1) {
 631                         ERROR("Out of memory");
 632                         return WIMLIB_ERR_NOMEM;
 633                 }
 634                 DEBUG("Added security ID = %u for `%s'",
 635                       root->d_inode->i_security_id, path);
 636                 ret = 0;
 637         } else if (ret < 0) {
 638                 ERROR_WITH_ERRNO("Failed to get security information from "
 639                                  "`%s'", path);
 640                 ret = WIMLIB_ERR_NTFS_3G;
 641         } else {
 642                 root->d_inode->i_security_id = -1;
 643                 DEBUG("No security ID for `%s'", path);
 644         }
 645         return ret;
 646 }
 647
 648 int build_dentry_tree_ntfs(struct wim_dentry **root_p,
 649                            const char *device,
 650                            struct wim_lookup_table *lookup_table,
 651                            struct wim_security_data *sd,
 652                            const struct capture_config *config,
 653                            int add_image_flags,
 654                            wimlib_progress_func_t progress_func,
 655                            void *extra_arg)
 656 {
 657         ntfs_volume *vol;
 658         ntfs_inode *root_ni;
 659         int ret;
 660         struct sd_set sd_set = {
 661                 .sd = sd,
 662                 .rb_root = {NULL},
 663         };
 664         ntfs_volume **ntfs_vol_p = extra_arg;
 665
 666         DEBUG("Mounting NTFS volume `%s' read-only", device);
 667
 668 #ifdef HAVE_NTFS_MNT_RDONLY
 669         /* NTFS-3g 2013 */
 670         vol = ntfs_mount(device, NTFS_MNT_RDONLY);
 671 #else
 672         /* NTFS-3g 2011, 2012 */
 673         vol = ntfs_mount(device, MS_RDONLY);
 674 #endif
 675         if (!vol) {
 676                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 677                                  device);
 678                 return WIMLIB_ERR_NTFS_3G;
 679         }
 680         ntfs_open_secure(vol);
 681
 682         /* We don't want to capture the special NTFS files such as $Bitmap.  Not
 683          * to be confused with "hidden" or "system" files which are real files
 684          * that we do need to capture.  */
 685         NVolClearShowSysFiles(vol);
 686
 687         DEBUG("Opening root NTFS dentry");
 688         root_ni = ntfs_inode_open(vol, FILE_root);
 689         if (!root_ni) {
 690                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 691                                  "`%s'", device);
 692                 ret = WIMLIB_ERR_NTFS_3G;
 693                 goto out;
 694         }
 695
 696         /* Currently we assume that all the UTF-8 paths fit into this length and
 697          * there is no check for overflow. */
 698         char *path = MALLOC(32768);
 699         if (!path) {
 700                 ERROR("Could not allocate memory for NTFS pathname");
 701                 ret = WIMLIB_ERR_NOMEM;
 702                 goto out_cleanup;
 703         }
 704
 705         path[0] = '/';
 706         path[1] = '\0';
 707         ret = build_dentry_tree_ntfs_recursive(root_p, NULL, root_ni, path, 1,
 708                                                FILE_NAME_POSIX, lookup_table,
 709                                                &sd_set,
 710                                                config, ntfs_vol_p,
 711                                                add_image_flags,
 712                                                progress_func);
 713 out_cleanup:
 714         FREE(path);
 715         ntfs_inode_close(root_ni);
 716         destroy_sd_set(&sd_set);
 717 out:
 718         ntfs_index_ctx_put(vol->secure_xsii);
 719         ntfs_index_ctx_put(vol->secure_xsdh);
 720         ntfs_inode_close(vol->secure_ni);
 721
 722         if (ret) {
 723                 if (ntfs_umount(vol, FALSE) != 0) {
 724                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'",
 725                                          device);
 726                         if (ret == 0)
 727                                 ret = WIMLIB_ERR_NTFS_3G;
 728                 }
 729         } else {
 730                 /* We need to leave the NTFS volume mounted so that we can read
 731                  * the NTFS files again when we are actually writing the WIM */
 732                 *ntfs_vol_p = vol;
 733         }
 734         return ret;
 735 }