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   1 /*
   2  * win32_capture.c - Windows-specific code for capturing files into a WIM image.
   3  */
   4
   5 /*
   6  * Copyright (C) 2013, 2014 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef __WIN32__
  25
  26 #ifdef HAVE_CONFIG_H
  27 #  include "config.h"
  28 #endif
  29
  30 #include "wimlib/win32_common.h"
  31
  32 #include "wimlib/capture.h"
  33 #include "wimlib/dentry.h"
  34 #include "wimlib/encoding.h"
  35 #include "wimlib/endianness.h"
  36 #include "wimlib/error.h"
  37 #include "wimlib/lookup_table.h"
  38 #include "wimlib/paths.h"
  39 #include "wimlib/reparse.h"
  40
  41 #define MAX_GET_SD_ACCESS_DENIED_WARNINGS 1
  42 #define MAX_GET_SACL_PRIV_NOTHELD_WARNINGS 1
  43 #define MAX_CAPTURE_LONG_PATH_WARNINGS 5
  44
  45 struct win32_capture_state {
  46         unsigned long num_get_sd_access_denied;
  47         unsigned long num_get_sacl_priv_notheld;
  48         unsigned long num_long_path_warnings;
  49 };
  50
  51
  52 int
  53 read_win32_file_prefix(const struct wim_lookup_table_entry *lte,
  54                        u64 size,
  55                        consume_data_callback_t cb,
  56                        void *cb_ctx)
  57 {
  58         int ret = 0;
  59         u64 bytes_remaining;
  60         u8 buf[BUFFER_SIZE];
  61
  62         HANDLE hFile = win32_open_existing_file(lte->file_on_disk,
  63                                                 FILE_READ_DATA);
  64         if (hFile == INVALID_HANDLE_VALUE) {
  65                 set_errno_from_GetLastError();
  66                 ERROR_WITH_ERRNO("Failed to open \"%ls\"", lte->file_on_disk);
  67                 return WIMLIB_ERR_OPEN;
  68         }
  69
  70         bytes_remaining = size;
  71         while (bytes_remaining) {
  72                 DWORD bytesToRead, bytesRead;
  73
  74                 bytesToRead = min(sizeof(buf), bytes_remaining);
  75                 if (!ReadFile(hFile, buf, bytesToRead, &bytesRead, NULL) ||
  76                     bytesRead != bytesToRead)
  77                 {
  78                         set_errno_from_GetLastError();
  79                         ERROR_WITH_ERRNO("Failed to read data from \"%ls\"",
  80                                          lte->file_on_disk);
  81                         ret = WIMLIB_ERR_READ;
  82                         break;
  83                 }
  84                 bytes_remaining -= bytesRead;
  85                 ret = (*cb)(buf, bytesRead, cb_ctx);
  86                 if (ret)
  87                         break;
  88         }
  89         CloseHandle(hFile);
  90         return ret;
  91 }
  92
  93 struct win32_encrypted_read_ctx {
  94         consume_data_callback_t read_prefix_cb;
  95         void *read_prefix_ctx;
  96         int wimlib_err_code;
  97         u64 bytes_remaining;
  98 };
  99
 100 static DWORD WINAPI
 101 win32_encrypted_export_cb(unsigned char *data, void *_ctx, unsigned long len)
 102 {
 103         struct win32_encrypted_read_ctx *ctx = _ctx;
 104         int ret;
 105         size_t bytes_to_consume = min(len, ctx->bytes_remaining);
 106
 107         if (bytes_to_consume == 0)
 108                 return ERROR_SUCCESS;
 109
 110         ret = (*ctx->read_prefix_cb)(data, bytes_to_consume, ctx->read_prefix_ctx);
 111         if (ret) {
 112                 ctx->wimlib_err_code = ret;
 113                 /* Shouldn't matter what error code is returned here, as long as
 114                  * it isn't ERROR_SUCCESS.  */
 115                 return ERROR_READ_FAULT;
 116         }
 117         ctx->bytes_remaining -= bytes_to_consume;
 118         return ERROR_SUCCESS;
 119 }
 120
 121 int
 122 read_win32_encrypted_file_prefix(const struct wim_lookup_table_entry *lte,
 123                                  u64 size,
 124                                  consume_data_callback_t cb,
 125                                  void *cb_ctx)
 126 {
 127         struct win32_encrypted_read_ctx export_ctx;
 128         DWORD err;
 129         void *file_ctx;
 130         int ret;
 131
 132         DEBUG("Reading %"PRIu64" bytes from encrypted file \"%ls\"",
 133               size, lte->file_on_disk);
 134
 135         export_ctx.read_prefix_cb = cb;
 136         export_ctx.read_prefix_ctx = cb_ctx;
 137         export_ctx.wimlib_err_code = 0;
 138         export_ctx.bytes_remaining = size;
 139
 140         err = OpenEncryptedFileRaw(lte->file_on_disk, 0, &file_ctx);
 141         if (err != ERROR_SUCCESS) {
 142                 set_errno_from_win32_error(err);
 143                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 144                                  "for raw read", lte->file_on_disk);
 145                 return WIMLIB_ERR_OPEN;
 146         }
 147         err = ReadEncryptedFileRaw(win32_encrypted_export_cb,
 148                                    &export_ctx, file_ctx);
 149         if (err != ERROR_SUCCESS) {
 150                 set_errno_from_win32_error(err);
 151                 ERROR_WITH_ERRNO("Failed to read encrypted file \"%ls\"",
 152                                  lte->file_on_disk);
 153                 ret = export_ctx.wimlib_err_code;
 154                 if (ret == 0)
 155                         ret = WIMLIB_ERR_READ;
 156         } else if (export_ctx.bytes_remaining != 0) {
 157                 ERROR("Only could read %"PRIu64" of %"PRIu64" bytes from "
 158                       "encryted file \"%ls\"",
 159                       size - export_ctx.bytes_remaining, size,
 160                       lte->file_on_disk);
 161                 ret = WIMLIB_ERR_READ;
 162         } else {
 163                 ret = 0;
 164         }
 165         CloseEncryptedFileRaw(file_ctx);
 166         return ret;
 167 }
 168
 169
 170 static u64
 171 FILETIME_to_u64(const FILETIME *ft)
 172 {
 173         return ((u64)ft->dwHighDateTime << 32) | (u64)ft->dwLowDateTime;
 174 }
 175
 176 /* Load the short name of a file into a WIM dentry.
 177  *
 178  * If we can't read the short filename for some reason, we just ignore the error
 179  * and assume the file has no short name.  This shouldn't be an issue, since the
 180  * short names are essentially obsolete anyway.
 181  */
 182 static int
 183 win32_get_short_name(HANDLE hFile, struct wim_dentry *dentry)
 184 {
 185
 186         /* It's not any harder to just make the NtQueryInformationFile() system
 187          * call ourselves, and it saves a dumb call to FindFirstFile() which of
 188          * course has to create its own handle.  */
 189         NTSTATUS status;
 190         IO_STATUS_BLOCK io_status;
 191         u8 buf[128] _aligned_attribute(8);
 192         const FILE_NAME_INFORMATION *info;
 193
 194         status = (*func_NtQueryInformationFile)(hFile, &io_status, buf, sizeof(buf),
 195                                                 FileAlternateNameInformation);
 196         info = (const FILE_NAME_INFORMATION*)buf;
 197         if (NT_SUCCESS(status) && info->FileNameLength != 0) {
 198                 dentry->short_name = utf16le_dupz(info->FileName,
 199                                                   info->FileNameLength);
 200                 if (!dentry->short_name)
 201                         return WIMLIB_ERR_NOMEM;
 202                 dentry->short_name_nbytes = info->FileNameLength;
 203         }
 204         return 0;
 205 }
 206
 207 static int
 208 win32_get_security_descriptor(HANDLE hFile,
 209                               const wchar_t *path,
 210                               struct wim_inode *inode,
 211                               struct wim_sd_set *sd_set,
 212                               struct win32_capture_state *state,
 213                               int add_flags)
 214 {
 215         SECURITY_INFORMATION requestedInformation;
 216         u8 _buf[4096];
 217         u8 *buf;
 218         size_t bufsize;
 219         DWORD lenNeeded;
 220         NTSTATUS status;
 221         int ret;
 222
 223         requestedInformation = DACL_SECURITY_INFORMATION |
 224                                SACL_SECURITY_INFORMATION |
 225                                OWNER_SECURITY_INFORMATION |
 226                                GROUP_SECURITY_INFORMATION;
 227         buf = _buf;
 228         bufsize = sizeof(_buf);
 229
 230         /*
 231          * We need the file's security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 232          * format, and we currently have a handle opened with as many relevant
 233          * permissions as possible.  At this point, on Windows there are a number of
 234          * options for reading a file's security descriptor:
 235          *
 236          * GetFileSecurity():  This takes in a path and returns the
 237          * SECURITY_DESCRIPTOR_RELATIVE.  Problem: this uses an internal handle, not
 238          * ours, and the handle created internally doesn't specify
 239          * FILE_FLAG_BACKUP_SEMANTICS.  Therefore there can be access denied errors on
 240          * some files and directories, even when running as the Administrator.
 241          *
 242          * GetSecurityInfo():  This takes in a handle and returns the security
 243          * descriptor split into a bunch of different parts.  This should work, but it's
 244          * dumb because we have to put the security descriptor back together again.
 245          *
 246          * BackupRead():  This can read the security descriptor, but this is a
 247          * difficult-to-use API, probably only works as the Administrator, and the
 248          * format of the returned data is not well documented.
 249          *
 250          * NtQuerySecurityObject():  This is exactly what we need, as it takes in a
 251          * handle and returns the security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 252          * format.  Only problem is that it's a ntdll function and therefore not
 253          * officially part of the Win32 API.  Oh well.
 254          */
 255         while (!(NT_SUCCESS(status = (*func_NtQuerySecurityObject)(hFile,
 256                                                                    requestedInformation,
 257                                                                    (PSECURITY_DESCRIPTOR)buf,
 258                                                                    bufsize,
 259                                                                    &lenNeeded))))
 260         {
 261                 switch (status) {
 262                 case STATUS_BUFFER_OVERFLOW:
 263                         wimlib_assert(buf == _buf);
 264                         buf = MALLOC(lenNeeded);
 265                         if (!buf)
 266                                 return WIMLIB_ERR_NOMEM;
 267                         bufsize = lenNeeded;
 268                         break;
 269                 case STATUS_PRIVILEGE_NOT_HELD:
 270                 case STATUS_ACCESS_DENIED:
 271                         if (add_flags & WIMLIB_ADD_FLAG_STRICT_ACLS) {
 272                 default:
 273                                 set_errno_from_nt_status(status);
 274                                 ERROR_WITH_ERRNO("\"%ls\": Failed to "
 275                                                  "read security descriptor", path);
 276                                 ret = WIMLIB_ERR_READ;
 277                                 goto out_free_buf;
 278                         }
 279                         if (requestedInformation & SACL_SECURITY_INFORMATION) {
 280                                 state->num_get_sacl_priv_notheld++;
 281                                 requestedInformation &= ~SACL_SECURITY_INFORMATION;
 282                                 break;
 283                         }
 284                         state->num_get_sd_access_denied++;
 285                         ret = 0;
 286                         goto out_free_buf;
 287                 }
 288         }
 289
 290         inode->i_security_id = sd_set_add_sd(sd_set, buf, lenNeeded);
 291         if (inode->i_security_id < 0)
 292                 ret = WIMLIB_ERR_NOMEM;
 293         else
 294                 ret = 0;
 295 out_free_buf:
 296         if (buf != _buf)
 297                 FREE(buf);
 298         return ret;
 299 }
 300
 301 static int
 302 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 303                                   wchar_t *path,
 304                                   size_t path_num_chars,
 305                                   struct add_image_params *params,
 306                                   struct win32_capture_state *state,
 307                                   unsigned vol_flags);
 308
 309 /* Reads the directory entries of directory and recursively calls
 310  * win32_build_dentry_tree() on them.  */
 311 static int
 312 win32_recurse_directory(HANDLE hDir,
 313                         wchar_t *dir_path,
 314                         size_t dir_path_num_chars,
 315                         struct wim_dentry *root,
 316                         struct add_image_params *params,
 317                         struct win32_capture_state *state,
 318                         unsigned vol_flags)
 319 {
 320         int ret;
 321
 322         DEBUG("Recurse to directory \"%ls\"", dir_path);
 323
 324         /* Using NtQueryDirectoryFile() we can re-use the same open handle,
 325          * which we opened with FILE_FLAG_BACKUP_SEMANTICS.  */
 326
 327         NTSTATUS status;
 328         IO_STATUS_BLOCK io_status;
 329         const size_t bufsize = 8192;
 330         void *buf;
 331
 332         buf = MALLOC(bufsize);
 333         if (!buf)
 334                 return WIMLIB_ERR_NOMEM;
 335
 336         while (NT_SUCCESS(status = (*func_NtQueryDirectoryFile)(hDir, NULL, NULL, NULL,
 337                                                                 &io_status, buf, bufsize,
 338                                                                 FileNamesInformation,
 339                                                                 FALSE, NULL, FALSE)))
 340         {
 341                 const FILE_NAMES_INFORMATION *info = buf;
 342                 for (;;) {
 343                         if (!(info->FileNameLength == 2 && info->FileName[0] == L'.') &&
 344                             !(info->FileNameLength == 4 && info->FileName[0] == L'.' &&
 345                                                            info->FileName[1] == L'.'))
 346                         {
 347                                 wchar_t *p;
 348                                 struct wim_dentry *child;
 349
 350                                 p = dir_path + dir_path_num_chars;
 351                                 *p++ = L'\\';
 352                                 p = wmempcpy(p, info->FileName,
 353                                              info->FileNameLength / 2);
 354                                 *p = '\0';
 355
 356                                 ret = win32_build_dentry_tree_recursive(
 357                                                                 &child,
 358                                                                 dir_path,
 359                                                                 p - dir_path,
 360                                                                 params,
 361                                                                 state,
 362                                                                 vol_flags);
 363
 364                                 dir_path[dir_path_num_chars] = L'\0';
 365
 366                                 if (ret)
 367                                         goto out_free_buf;
 368                                 if (child)
 369                                         dentry_add_child(root, child);
 370                         }
 371                         if (info->NextEntryOffset == 0)
 372                                 break;
 373                         info = (const FILE_NAMES_INFORMATION *)
 374                                         ((const u8 *)info + info->NextEntryOffset);
 375                 }
 376         }
 377
 378         if (status != STATUS_NO_MORE_FILES) {
 379                 set_errno_from_nt_status(status);
 380                 ERROR_WITH_ERRNO("Failed to read directory \"%ls\"", dir_path);
 381                 ret = WIMLIB_ERR_READ;
 382         }
 383 out_free_buf:
 384         FREE(buf);
 385         return ret;
 386 }
 387
 388 /* Reparse point fixup status code */
 389 enum rp_status {
 390         /* Reparse point corresponded to an absolute symbolic link or junction
 391          * point that pointed outside the directory tree being captured, and
 392          * therefore was excluded. */
 393         RP_EXCLUDED       = 0x0,
 394
 395         /* Reparse point was not fixed as it was either a relative symbolic
 396          * link, a mount point, or something else we could not understand. */
 397         RP_NOT_FIXED      = 0x1,
 398
 399         /* Reparse point corresponded to an absolute symbolic link or junction
 400          * point that pointed inside the directory tree being captured, where
 401          * the target was specified by a "full" \??\ prefixed path, and
 402          * therefore was fixed to be relative to the root of the directory tree
 403          * being captured. */
 404         RP_FIXED_FULLPATH = 0x2,
 405
 406         /* Same as RP_FIXED_FULLPATH, except the absolute link target did not
 407          * have the \??\ prefix.  It may have begun with a drive letter though.
 408          * */
 409         RP_FIXED_ABSPATH  = 0x4,
 410
 411         /* Either RP_FIXED_FULLPATH or RP_FIXED_ABSPATH. */
 412         RP_FIXED          = RP_FIXED_FULLPATH | RP_FIXED_ABSPATH,
 413 };
 414
 415 /* Given the "substitute name" target of a Windows reparse point, try doing a
 416  * fixup where we change it to be absolute relative to the root of the directory
 417  * tree being captured.
 418  *
 419  * Note that this is only executed when WIMLIB_ADD_FLAG_RPFIX has been
 420  * set.
 421  *
 422  * @capture_root_ino and @capture_root_dev indicate the inode number and device
 423  * of the root of the directory tree being captured.  They are meant to identify
 424  * this directory (as an alternative to its actual path, which could potentially
 425  * be reached via multiple destinations due to other symbolic links).  This may
 426  * not work properly on FAT, which doesn't seem to supply proper inode numbers
 427  * or file IDs.  However, FAT doesn't support reparse points so this function
 428  * wouldn't even be called anyway.
 429  */
 430 static enum rp_status
 431 win32_capture_maybe_rpfix_target(wchar_t *target, u16 *target_nbytes_p,
 432                                  u64 capture_root_ino, u64 capture_root_dev,
 433                                  u32 rptag)
 434 {
 435         u16 target_nchars = *target_nbytes_p / 2;
 436         size_t stripped_chars;
 437         wchar_t *orig_target;
 438         int ret;
 439
 440         ret = parse_substitute_name(target, *target_nbytes_p, rptag);
 441         if (ret < 0)
 442                 return RP_NOT_FIXED;
 443         stripped_chars = ret;
 444         if (stripped_chars)
 445                 stripped_chars -= 2;
 446         target[target_nchars] = L'\0';
 447         orig_target = target;
 448         target = capture_fixup_absolute_symlink(target + stripped_chars,
 449                                                 capture_root_ino, capture_root_dev);
 450         if (!target)
 451                 return RP_EXCLUDED;
 452         target_nchars = wcslen(target);
 453         wmemmove(orig_target + stripped_chars, target, target_nchars + 1);
 454         *target_nbytes_p = (target_nchars + stripped_chars) * sizeof(wchar_t);
 455         DEBUG("Fixed reparse point (new target: \"%ls\")", orig_target);
 456         if (stripped_chars)
 457                 return RP_FIXED_FULLPATH;
 458         else
 459                 return RP_FIXED_ABSPATH;
 460 }
 461
 462 /* Returns: `enum rp_status' value on success; negative WIMLIB_ERR_* value on
 463  * failure. */
 464 static int
 465 win32_capture_try_rpfix(u8 *rpbuf, u16 *rpbuflen_p,
 466                         u64 capture_root_ino, u64 capture_root_dev,
 467                         const wchar_t *path, struct add_image_params *params)
 468 {
 469         struct reparse_data rpdata;
 470         int ret;
 471         enum rp_status rp_status;
 472
 473         ret = parse_reparse_data(rpbuf, *rpbuflen_p, &rpdata);
 474         if (ret)
 475                 return -ret;
 476
 477         rp_status = win32_capture_maybe_rpfix_target(rpdata.substitute_name,
 478                                                      &rpdata.substitute_name_nbytes,
 479                                                      capture_root_ino,
 480                                                      capture_root_dev,
 481                                                      le32_to_cpu(*(le32*)rpbuf));
 482         if (rp_status & RP_FIXED) {
 483                 wimlib_assert(rpdata.substitute_name_nbytes % 2 == 0);
 484                 utf16lechar substitute_name_copy[rpdata.substitute_name_nbytes / 2];
 485                 wmemcpy(substitute_name_copy, rpdata.substitute_name,
 486                         rpdata.substitute_name_nbytes / 2);
 487                 rpdata.substitute_name = substitute_name_copy;
 488                 rpdata.print_name = substitute_name_copy;
 489                 rpdata.print_name_nbytes = rpdata.substitute_name_nbytes;
 490                 if (rp_status == RP_FIXED_FULLPATH) {
 491                         /* "full path", meaning \??\ prefixed.  We should not
 492                          * include this prefix in the print name, as it is
 493                          * apparently meant for the filesystem driver only. */
 494                         rpdata.print_name += 4;
 495                         rpdata.print_name_nbytes -= 8;
 496                 }
 497                 ret = make_reparse_buffer(&rpdata, rpbuf, rpbuflen_p);
 498                 if (ret == 0)
 499                         ret = rp_status;
 500                 else
 501                         ret = -ret;
 502         } else {
 503                 if (rp_status == RP_EXCLUDED) {
 504                         /* Ignoring absolute symbolic link or junction point
 505                          * that points out of the tree to be captured.  */
 506                         size_t print_name_nchars = rpdata.print_name_nbytes / 2;
 507                         wchar_t print_name0[print_name_nchars + 1];
 508                         print_name0[print_name_nchars] = L'\0';
 509                         wmemcpy(print_name0, rpdata.print_name, print_name_nchars);
 510
 511                         params->progress.scan.cur_path = path;
 512                         params->progress.scan.symlink_target = print_name0;
 513                         do_capture_progress(params,
 514                                             WIMLIB_SCAN_DENTRY_EXCLUDED_SYMLINK,
 515                                             NULL);
 516                 }
 517                 ret = rp_status;
 518         }
 519         return ret;
 520 }
 521
 522 /*
 523  * Loads the reparse point data from a reparse point into memory, optionally
 524  * fixing the targets of absolute symbolic links and junction points to be
 525  * relative to the root of capture.
 526  *
 527  * @hFile:  Open handle to the reparse point.
 528  * @path:   Path to the reparse point.  Used for error messages only.
 529  * @params: Additional parameters, including whether to do reparse point fixups
 530  *          or not.
 531  * @rpbuf:  Buffer of length at least REPARSE_POINT_MAX_SIZE bytes into which
 532  *          the reparse point buffer will be loaded.
 533  * @rpbuflen_ret:  On success, the length of the reparse point buffer in bytes
 534  *                 is written to this location.
 535  *
 536  * Returns:
 537  *      On success, returns an `enum rp_status' value that indicates if and/or
 538  *      how the reparse point fixup was done.
 539  *
 540  *      On failure, returns a negative value that is a negated WIMLIB_ERR_*
 541  *      code.
 542  */
 543 static int
 544 win32_get_reparse_data(HANDLE hFile, const wchar_t *path,
 545                        struct add_image_params *params,
 546                        u8 *rpbuf, u16 *rpbuflen_ret)
 547 {
 548         DWORD bytesReturned;
 549         u32 reparse_tag;
 550         int ret;
 551         u16 rpbuflen;
 552
 553         DEBUG("Loading reparse data from \"%ls\"", path);
 554         if (!DeviceIoControl(hFile, FSCTL_GET_REPARSE_POINT,
 555                              NULL, /* "Not used with this operation; set to NULL" */
 556                              0, /* "Not used with this operation; set to 0" */
 557                              rpbuf, /* "A pointer to a buffer that
 558                                                    receives the reparse point data */
 559                              REPARSE_POINT_MAX_SIZE, /* "The size of the output
 560                                                         buffer, in bytes */
 561                              &bytesReturned,
 562                              NULL))
 563         {
 564                 set_errno_from_GetLastError();
 565                 ERROR_WITH_ERRNO("Failed to get reparse data of \"%ls\"", path);
 566                 return -WIMLIB_ERR_READ;
 567         }
 568         if (bytesReturned < 8 || bytesReturned > REPARSE_POINT_MAX_SIZE) {
 569                 ERROR("Reparse data on \"%ls\" is invalid", path);
 570                 return -WIMLIB_ERR_INVALID_REPARSE_DATA;
 571         }
 572
 573         rpbuflen = bytesReturned;
 574         reparse_tag = le32_to_cpu(*(le32*)rpbuf);
 575         if (params->add_flags & WIMLIB_ADD_FLAG_RPFIX &&
 576             (reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
 577              reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT))
 578         {
 579                 /* Try doing reparse point fixup */
 580                 ret = win32_capture_try_rpfix(rpbuf,
 581                                               &rpbuflen,
 582                                               params->capture_root_ino,
 583                                               params->capture_root_dev,
 584                                               path,
 585                                               params);
 586         } else {
 587                 ret = RP_NOT_FIXED;
 588         }
 589         *rpbuflen_ret = rpbuflen;
 590         return ret;
 591 }
 592
 593 static DWORD WINAPI
 594 win32_tally_encrypted_size_cb(unsigned char *_data, void *_size_ret,
 595                               unsigned long len)
 596 {
 597         *(u64*)_size_ret += len;
 598         return ERROR_SUCCESS;
 599 }
 600
 601 static int
 602 win32_get_encrypted_file_size(const wchar_t *path, u64 *size_ret)
 603 {
 604         DWORD err;
 605         void *file_ctx;
 606         int ret;
 607
 608         err = OpenEncryptedFileRaw(path, 0, &file_ctx);
 609         if (err != ERROR_SUCCESS) {
 610                 set_errno_from_win32_error(err);
 611                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 612                                  "for raw read", path);
 613                 return WIMLIB_ERR_OPEN;
 614         }
 615         *size_ret = 0;
 616         err = ReadEncryptedFileRaw(win32_tally_encrypted_size_cb,
 617                                    size_ret, file_ctx);
 618         if (err != ERROR_SUCCESS) {
 619                 set_errno_from_win32_error(err);
 620                 ERROR_WITH_ERRNO("Failed to read raw encrypted data from "
 621                                  "\"%ls\"", path);
 622                 ret = WIMLIB_ERR_READ;
 623         } else {
 624                 ret = 0;
 625         }
 626         CloseEncryptedFileRaw(file_ctx);
 627         return ret;
 628 }
 629
 630 /* Scans an unnamed or named stream of a Win32 file (not a reparse point
 631  * stream); calculates its SHA1 message digest and either creates a `struct
 632  * wim_lookup_table_entry' in memory for it, or uses an existing 'struct
 633  * wim_lookup_table_entry' for an identical stream.
 634  *
 635  * @path:               Path to the file (UTF-16LE).
 636  *
 637  * @path_num_chars:     Number of 2-byte characters in @path.
 638  *
 639  * @inode:              WIM inode to save the stream into.
 640  *
 641  * @unhashed_streams:   List of unhashed streams that have been added to the WIM
 642  *                      image.
 643  *
 644  * @dat:                A `WIN32_FIND_STREAM_DATA' structure that specifies the
 645  *                      stream name.
 646  *
 647  * Returns 0 on success; nonzero on failure.
 648  */
 649 static int
 650 win32_capture_stream(const wchar_t *path,
 651                      size_t path_num_chars,
 652                      struct wim_inode *inode,
 653                      struct list_head *unhashed_streams,
 654                      WIN32_FIND_STREAM_DATA *dat)
 655 {
 656         struct wim_ads_entry *ads_entry;
 657         struct wim_lookup_table_entry *lte;
 658         int ret;
 659         wchar_t *stream_name, *colon;
 660         size_t stream_name_nchars;
 661         bool is_named_stream;
 662         wchar_t *spath;
 663         size_t spath_nchars;
 664         size_t spath_buf_nbytes;
 665         const wchar_t *relpath_prefix;
 666         const wchar_t *colonchar;
 667
 668         DEBUG("Capture \"%ls\" stream \"%ls\"", path, dat->cStreamName);
 669
 670         /* The stream name should be returned as :NAME:TYPE */
 671         stream_name = dat->cStreamName;
 672         if (*stream_name != L':')
 673                 goto out_invalid_stream_name;
 674         stream_name += 1;
 675         colon = wcschr(stream_name, L':');
 676         if (colon == NULL)
 677                 goto out_invalid_stream_name;
 678
 679         if (wcscmp(colon + 1, L"$DATA")) {
 680                 /* Not a DATA stream */
 681                 ret = 0;
 682                 goto out;
 683         }
 684
 685         *colon = '\0';
 686
 687         stream_name_nchars = colon - stream_name;
 688         is_named_stream = (stream_name_nchars != 0);
 689
 690         if (is_named_stream) {
 691                 /* Allocate an ADS entry for the named stream. */
 692                 ads_entry = inode_add_ads_utf16le(inode, stream_name,
 693                                                   stream_name_nchars * sizeof(wchar_t));
 694                 if (!ads_entry) {
 695                         ret = WIMLIB_ERR_NOMEM;
 696                         goto out;
 697                 }
 698         }
 699
 700         /* If zero length stream, no lookup table entry needed. */
 701         if ((u64)dat->StreamSize.QuadPart == 0) {
 702                 ret = 0;
 703                 goto out;
 704         }
 705
 706         /* Create a UTF-16LE string @spath that gives the filename, then a
 707          * colon, then the stream name.  Or, if it's an unnamed stream, just the
 708          * filename.  It is MALLOC()'ed so that it can be saved in the
 709          * wim_lookup_table_entry if needed.
 710          *
 711          * As yet another special case, relative paths need to be changed to
 712          * begin with an explicit "./" so that, for example, a file t:ads, where
 713          * :ads is the part we added, is not interpreted as a file on the t:
 714          * drive. */
 715         spath_nchars = path_num_chars;
 716         relpath_prefix = L"";
 717         colonchar = L"";
 718         if (is_named_stream) {
 719                 spath_nchars += 1 + stream_name_nchars;
 720                 colonchar = L":";
 721                 if (path_num_chars == 1 && !is_any_path_separator(path[0])) {
 722                         spath_nchars += 2;
 723                         static const wchar_t _relpath_prefix[] =
 724                                 {L'.', OS_PREFERRED_PATH_SEPARATOR, L'\0'};
 725                         relpath_prefix = _relpath_prefix;
 726                 }
 727         }
 728
 729         spath_buf_nbytes = (spath_nchars + 1) * sizeof(wchar_t);
 730         spath = MALLOC(spath_buf_nbytes);
 731
 732         tsprintf(spath, L"%ls%ls%ls%ls",
 733                  relpath_prefix, path, colonchar, stream_name);
 734
 735         /* Make a new wim_lookup_table_entry */
 736         lte = new_lookup_table_entry();
 737         if (!lte) {
 738                 ret = WIMLIB_ERR_NOMEM;
 739                 goto out_free_spath;
 740         }
 741         lte->file_on_disk = spath;
 742         spath = NULL;
 743         if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED && !is_named_stream) {
 744                 u64 encrypted_size;
 745                 lte->resource_location = RESOURCE_WIN32_ENCRYPTED;
 746                 ret = win32_get_encrypted_file_size(path, &encrypted_size);
 747                 if (ret)
 748                         goto out_free_spath;
 749                 lte->size = encrypted_size;
 750         } else {
 751                 lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 752                 lte->size = (u64)dat->StreamSize.QuadPart;
 753         }
 754
 755         u32 stream_id;
 756         if (is_named_stream) {
 757                 stream_id = ads_entry->stream_id;
 758                 ads_entry->lte = lte;
 759         } else {
 760                 stream_id = 0;
 761                 inode->i_lte = lte;
 762         }
 763         add_unhashed_stream(lte, inode, stream_id, unhashed_streams);
 764         ret = 0;
 765 out_free_spath:
 766         FREE(spath);
 767 out:
 768         return ret;
 769 out_invalid_stream_name:
 770         ERROR("Invalid stream name: \"%ls:%ls\"", path, dat->cStreamName);
 771         ret = WIMLIB_ERR_READ;
 772         goto out;
 773 }
 774
 775 /* Load information about the streams of an open file into a WIM inode.
 776  *
 777  * We use the NtQueryInformationFile() system call instead of FindFirstStream()
 778  * and FindNextStream().  This is done for two reasons:
 779  *
 780  * - FindFirstStream() opens its own handle to the file or directory and
 781  *   apparently does so without specifying FILE_FLAG_BACKUP_SEMANTICS, thereby
 782  *   causing access denied errors on certain files (even when running as the
 783  *   Administrator).
 784  * - FindFirstStream() and FindNextStream() is only available on Windows Vista
 785  *   and later, whereas the stream support in NtQueryInformationFile() was
 786  *   already present in Windows XP.
 787  */
 788 static int
 789 win32_capture_streams(HANDLE *hFile_p,
 790                       const wchar_t *path,
 791                       size_t path_num_chars,
 792                       struct wim_inode *inode,
 793                       struct list_head *unhashed_streams,
 794                       u64 file_size,
 795                       unsigned vol_flags)
 796 {
 797         int ret;
 798         u8 _buf[8192] _aligned_attribute(8);
 799         u8 *buf;
 800         size_t bufsize;
 801         IO_STATUS_BLOCK io_status;
 802         NTSTATUS status;
 803         const FILE_STREAM_INFORMATION *info;
 804
 805         DEBUG("Capturing streams from \"%ls\"", path);
 806
 807         buf = _buf;
 808         bufsize = sizeof(_buf);
 809
 810         if (!(vol_flags & FILE_NAMED_STREAMS))
 811                 goto unnamed_only;
 812
 813         /* Get a buffer containing the stream information.  */
 814         while (!NT_SUCCESS(status = (*func_NtQueryInformationFile)(*hFile_p,
 815                                                                    &io_status,
 816                                                                    buf,
 817                                                                    bufsize,
 818                                                                    FileStreamInformation)))
 819         {
 820
 821                 switch (status) {
 822                 case STATUS_BUFFER_OVERFLOW:
 823                         {
 824                                 u8 *newbuf;
 825
 826                                 bufsize *= 2;
 827                                 if (buf == _buf)
 828                                         newbuf = MALLOC(bufsize);
 829                                 else
 830                                         newbuf = REALLOC(buf, bufsize);
 831                                 if (!newbuf) {
 832                                         ret = WIMLIB_ERR_NOMEM;
 833                                         goto out_free_buf;
 834                                 }
 835                                 buf = newbuf;
 836                         }
 837                         break;
 838                 case STATUS_NOT_IMPLEMENTED:
 839                 case STATUS_NOT_SUPPORTED:
 840                 case STATUS_INVALID_INFO_CLASS:
 841                         goto unnamed_only;
 842                 default:
 843                         set_errno_from_nt_status(status);
 844                         ERROR_WITH_ERRNO("\"%ls\": Failed to query "
 845                                          "stream information", path);
 846                         ret = WIMLIB_ERR_READ;
 847                         goto out_free_buf;
 848                 }
 849         }
 850
 851         if (io_status.Information == 0) {
 852                 /* No stream information.  */
 853                 ret = 0;
 854                 goto out_free_buf;
 855         }
 856
 857         if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED) {
 858                 /* OpenEncryptedFileRaw() seems to fail with
 859                  * ERROR_SHARING_VIOLATION if there are any handles opened to
 860                  * the file.  */
 861                 CloseHandle(*hFile_p);
 862                 *hFile_p = INVALID_HANDLE_VALUE;
 863         }
 864
 865         /* Parse one or more stream information structures.  */
 866         info = (const FILE_STREAM_INFORMATION *)buf;
 867         for (;;) {
 868                 WIN32_FIND_STREAM_DATA dat;
 869
 870                 if (info->StreamNameLength <= sizeof(dat.cStreamName) - 2) {
 871                         dat.StreamSize = info->StreamSize;
 872                         memcpy(dat.cStreamName, info->StreamName, info->StreamNameLength);
 873                         dat.cStreamName[info->StreamNameLength / 2] = L'\0';
 874
 875                         /* Capture the stream.  */
 876                         ret = win32_capture_stream(path, path_num_chars, inode,
 877                                                    unhashed_streams, &dat);
 878                         if (ret)
 879                                 goto out_free_buf;
 880                 }
 881                 if (info->NextEntryOffset == 0) {
 882                         /* No more stream information.  */
 883                         break;
 884                 }
 885                 /* Advance to next stream information.  */
 886                 info = (const FILE_STREAM_INFORMATION *)
 887                                 ((const u8 *)info + info->NextEntryOffset);
 888         }
 889         ret = 0;
 890         goto out_free_buf;
 891
 892 unnamed_only:
 893         /* The volume does not support named streams.  Only capture the unnamed
 894          * data stream. */
 895         DEBUG("Only capturing unnamed data stream");
 896         if (inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY |
 897                                    FILE_ATTRIBUTE_REPARSE_POINT))
 898         {
 899                 ret = 0;
 900                 goto out_free_buf;
 901         }
 902
 903         {
 904                 WIN32_FIND_STREAM_DATA dat;
 905
 906                 wcscpy(dat.cStreamName, L"::$DATA");
 907                 dat.StreamSize.QuadPart = file_size;
 908                 ret = win32_capture_stream(path, path_num_chars,
 909                                            inode, unhashed_streams, &dat);
 910         }
 911 out_free_buf:
 912         /* Free buffer if allocated on heap.  */
 913         if (buf != _buf)
 914                 FREE(buf);
 915         return ret;
 916 }
 917
 918 static int
 919 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 920                                   wchar_t *path,
 921                                   size_t path_num_chars,
 922                                   struct add_image_params *params,
 923                                   struct win32_capture_state *state,
 924                                   unsigned vol_flags)
 925 {
 926         struct wim_dentry *root = NULL;
 927         struct wim_inode *inode = NULL;
 928         DWORD err;
 929         u64 file_size;
 930         int ret;
 931         u8 *rpbuf;
 932         u16 rpbuflen;
 933         u16 not_rpfixed;
 934         HANDLE hFile = INVALID_HANDLE_VALUE;
 935         DWORD desiredAccess;
 936
 937
 938         if (should_exclude_path(path + params->capture_root_nchars,
 939                                 path_num_chars - params->capture_root_nchars,
 940                                 params->config))
 941         {
 942                 ret = 0;
 943                 goto out_progress;
 944         }
 945
 946 #if 0
 947         if (path_num_chars >= 4 &&
 948             !wmemcmp(path, L"\\\\?\\", 4) &&
 949             path_num_chars + 1 - 4 > MAX_PATH &&
 950             state->num_long_path_warnings < MAX_CAPTURE_LONG_PATH_WARNINGS)
 951         {
 952                 WARNING("Path \"%ls\" exceeds MAX_PATH", path);
 953                 if (++state->num_long_path_warnings == MAX_CAPTURE_LONG_PATH_WARNINGS)
 954                         WARNING("Suppressing further warnings about long paths.");
 955         }
 956 #endif
 957
 958         desiredAccess = FILE_READ_DATA | FILE_READ_ATTRIBUTES |
 959                         READ_CONTROL | ACCESS_SYSTEM_SECURITY;
 960 again:
 961         hFile = win32_open_existing_file(path, desiredAccess);
 962         if (hFile == INVALID_HANDLE_VALUE) {
 963                 err = GetLastError();
 964                 if (err == ERROR_ACCESS_DENIED || err == ERROR_PRIVILEGE_NOT_HELD) {
 965                         if (desiredAccess & ACCESS_SYSTEM_SECURITY) {
 966                                 desiredAccess &= ~ACCESS_SYSTEM_SECURITY;
 967                                 goto again;
 968                         }
 969                         if (desiredAccess & READ_CONTROL) {
 970                                 desiredAccess &= ~READ_CONTROL;
 971                                 goto again;
 972                         }
 973                 }
 974                 set_errno_from_GetLastError();
 975                 ERROR_WITH_ERRNO("Failed to open \"%ls\" for reading", path);
 976                 ret = WIMLIB_ERR_OPEN;
 977                 goto out;
 978         }
 979
 980         BY_HANDLE_FILE_INFORMATION file_info;
 981         if (!GetFileInformationByHandle(hFile, &file_info)) {
 982                 set_errno_from_GetLastError();
 983                 ERROR_WITH_ERRNO("Failed to get file information for \"%ls\"",
 984                                  path);
 985                 ret = WIMLIB_ERR_STAT;
 986                 goto out;
 987         }
 988
 989         if (file_info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 990                 rpbuf = alloca(REPARSE_POINT_MAX_SIZE);
 991                 ret = win32_get_reparse_data(hFile, path, params,
 992                                              rpbuf, &rpbuflen);
 993                 if (ret < 0) {
 994                         /* WIMLIB_ERR_* (inverted) */
 995                         ret = -ret;
 996                         goto out;
 997                 } else if (ret & RP_FIXED) {
 998                         not_rpfixed = 0;
 999                 } else if (ret == RP_EXCLUDED) {
1000                         ret = 0;
1001                         goto out;
1002                 } else {
1003                         not_rpfixed = 1;
1004                 }
1005         }
1006
1007         /* Create a WIM dentry with an associated inode, which may be shared.
1008          *
1009          * However, we need to explicitly check for directories and files with
1010          * only 1 link and refuse to hard link them.  This is because Windows
1011          * has a bug where it can return duplicate File IDs for files and
1012          * directories on the FAT filesystem. */
1013         ret = inode_table_new_dentry(params->inode_table,
1014                                      path_basename_with_len(path, path_num_chars),
1015                                      ((u64)file_info.nFileIndexHigh << 32) |
1016                                          (u64)file_info.nFileIndexLow,
1017                                      file_info.dwVolumeSerialNumber,
1018                                      (file_info.nNumberOfLinks <= 1 ||
1019                                         (file_info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)),
1020                                      &root);
1021         if (ret)
1022                 goto out;
1023
1024         ret = win32_get_short_name(hFile, root);
1025         if (ret)
1026                 goto out;
1027
1028         inode = root->d_inode;
1029
1030         if (inode->i_nlink > 1) {
1031                 /* Shared inode; nothing more to do */
1032                 goto out_progress;
1033         }
1034
1035         inode->i_attributes = file_info.dwFileAttributes;
1036         inode->i_creation_time = FILETIME_to_u64(&file_info.ftCreationTime);
1037         inode->i_last_write_time = FILETIME_to_u64(&file_info.ftLastWriteTime);
1038         inode->i_last_access_time = FILETIME_to_u64(&file_info.ftLastAccessTime);
1039         inode->i_resolved = 1;
1040
1041         params->add_flags &= ~WIMLIB_ADD_FLAG_ROOT;
1042
1043         if (!(params->add_flags & WIMLIB_ADD_FLAG_NO_ACLS)
1044             && (vol_flags & FILE_PERSISTENT_ACLS))
1045         {
1046                 ret = win32_get_security_descriptor(hFile, path, inode,
1047                                                     params->sd_set, state,
1048                                                     params->add_flags);
1049                 if (ret)
1050                         goto out;
1051         }
1052
1053         file_size = ((u64)file_info.nFileSizeHigh << 32) |
1054                      (u64)file_info.nFileSizeLow;
1055
1056
1057         /* Capture the unnamed data stream (only should be present for regular
1058          * files) and any alternate data streams. */
1059         ret = win32_capture_streams(&hFile,
1060                                     path,
1061                                     path_num_chars,
1062                                     inode,
1063                                     params->unhashed_streams,
1064                                     file_size,
1065                                     vol_flags);
1066         if (ret)
1067                 goto out;
1068
1069         if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1070                 /* Reparse point: set the reparse data (which we read already)
1071                  * */
1072                 inode->i_not_rpfixed = not_rpfixed;
1073                 inode->i_reparse_tag = le32_to_cpu(*(le32*)rpbuf);
1074                 ret = inode_set_unnamed_stream(inode, rpbuf + 8, rpbuflen - 8,
1075                                                params->lookup_table);
1076         } else if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
1077                 /* Directory (not a reparse point) --- recurse to children */
1078
1079                 if (hFile == INVALID_HANDLE_VALUE) {
1080                         /* Re-open handle that was closed to read raw encrypted
1081                          * data.  */
1082                         hFile = win32_open_existing_file(path, FILE_READ_DATA);
1083                         if (hFile == INVALID_HANDLE_VALUE) {
1084                                 set_errno_from_GetLastError();
1085                                 ERROR_WITH_ERRNO("Failed to reopen \"%ls\"",
1086                                                  path);
1087                                 ret = WIMLIB_ERR_OPEN;
1088                                 goto out;
1089                         }
1090                 }
1091                 ret = win32_recurse_directory(hFile,
1092                                               path,
1093                                               path_num_chars,
1094                                               root,
1095                                               params,
1096                                               state,
1097                                               vol_flags);
1098         }
1099         if (ret)
1100                 goto out;
1101
1102         path[path_num_chars] = '\0';
1103 out_progress:
1104         params->progress.scan.cur_path = path;
1105         if (root == NULL)
1106                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_EXCLUDED, NULL);
1107         else
1108                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_OK, inode);
1109 out:
1110         if (hFile != INVALID_HANDLE_VALUE)
1111                 CloseHandle(hFile);
1112         if (ret == 0)
1113                 *root_ret = root;
1114         else
1115                 free_dentry_tree(root, params->lookup_table);
1116         return ret;
1117 }
1118
1119 static void
1120 win32_do_capture_warnings(const wchar_t *path,
1121                           const struct win32_capture_state *state,
1122                           int add_flags)
1123 {
1124         if (state->num_get_sacl_priv_notheld == 0 &&
1125             state->num_get_sd_access_denied == 0)
1126                 return;
1127
1128         WARNING("Scan of \"%ls\" complete, but with one or more warnings:", path);
1129         if (state->num_get_sacl_priv_notheld != 0) {
1130                 WARNING("- Could not capture SACL (System Access Control List)\n"
1131                         "            on %lu files or directories.",
1132                         state->num_get_sacl_priv_notheld);
1133         }
1134         if (state->num_get_sd_access_denied != 0) {
1135                 WARNING("- Could not capture security descriptor at all\n"
1136                         "            on %lu files or directories.",
1137                         state->num_get_sd_access_denied);
1138         }
1139         WARNING("To fully capture all security descriptors, run the program\n"
1140                 "          with Administrator rights.");
1141 }
1142
1143 #define WINDOWS_NT_MAX_PATH 32768
1144
1145 /* Win32 version of capturing a directory tree */
1146 int
1147 win32_build_dentry_tree(struct wim_dentry **root_ret,
1148                         const wchar_t *root_disk_path,
1149                         struct add_image_params *params)
1150 {
1151         size_t path_nchars;
1152         wchar_t *path;
1153         int ret;
1154         struct win32_capture_state state;
1155         unsigned vol_flags;
1156         DWORD dret;
1157
1158         path_nchars = wcslen(root_disk_path);
1159         if (path_nchars > WINDOWS_NT_MAX_PATH)
1160                 return WIMLIB_ERR_INVALID_PARAM;
1161
1162         ret = win32_get_file_and_vol_ids(root_disk_path,
1163                                          &params->capture_root_ino,
1164                                          &params->capture_root_dev);
1165         if (ret) {
1166                 ERROR_WITH_ERRNO("Can't open %ls", root_disk_path);
1167                 return ret;
1168         }
1169
1170         win32_get_vol_flags(root_disk_path, &vol_flags, NULL);
1171
1172         /* WARNING: There is no check for overflow later when this buffer is
1173          * being used!  But it's as long as the maximum path length understood
1174          * by Windows NT (which is NOT the same as MAX_PATH). */
1175         path = MALLOC((WINDOWS_NT_MAX_PATH + 1) * sizeof(wchar_t));
1176         if (path == NULL)
1177                 return WIMLIB_ERR_NOMEM;
1178
1179         /* Work around defective behavior in Windows where paths longer than 260
1180          * characters are not supported by default; instead they need to be
1181          * turned into absolute paths and prefixed with "\\?\".  */
1182
1183         if (wcsncmp(root_disk_path, L"\\\\?\\", 4)) {
1184                 dret = GetFullPathName(root_disk_path, WINDOWS_NT_MAX_PATH - 3,
1185                                        &path[4], NULL);
1186
1187                 if (dret == 0 || dret >= WINDOWS_NT_MAX_PATH - 3) {
1188                         WARNING("Can't get full path name for \"%ls\"", root_disk_path);
1189                         wmemcpy(path, root_disk_path, path_nchars + 1);
1190                 } else {
1191                         wmemcpy(path, L"\\\\?\\", 4);
1192                         path_nchars = 4 + dret;
1193                 }
1194         } else {
1195                 wmemcpy(path, root_disk_path, path_nchars + 1);
1196         }
1197
1198        /* Strip trailing slashes.  If we don't do this, we may create a path
1199         * with multiple consecutive backslashes, which for some reason causes
1200         * Windows to report that the file cannot be found.  */
1201         while (path_nchars >= 2 &&
1202                path[path_nchars - 1] == L'\\' &&
1203                path[path_nchars - 2] != L':')
1204         {
1205                 path[--path_nchars] = L'\0';
1206         }
1207
1208         params->capture_root_nchars = path_nchars;
1209
1210         memset(&state, 0, sizeof(state));
1211         ret = win32_build_dentry_tree_recursive(root_ret, path,
1212                                                 path_nchars, params,
1213                                                 &state, vol_flags);
1214         FREE(path);
1215         if (ret == 0)
1216                 win32_do_capture_warnings(root_disk_path, &state, params->add_flags);
1217         return ret;
1218 }
1219
1220 #endif /* __WIN32__ */