wimlib.net Git - wimlib/blob - src/win32_capture.c

   1 /*
   2  * win32_capture.c - Windows-specific code for capturing files into a WIM image.
   3  */
   4
   5 /*
   6  * Copyright (C) 2013 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/endianness.h"
  34 #include "wimlib/error.h"
  35 #include "wimlib/lookup_table.h"
  36 #include "wimlib/paths.h"
  37 #include "wimlib/reparse.h"
  38
  39 #ifdef WITH_NTDLL
  40 #  include <winternl.h>
  41 #  include <ntstatus.h>
  42
  43 NTSTATUS WINAPI
  44 NtQuerySecurityObject(HANDLE handle,
  45                       SECURITY_INFORMATION SecurityInformation,
  46                       PSECURITY_DESCRIPTOR SecurityDescriptor,
  47                       ULONG Length,
  48                       PULONG LengthNeeded);
  49 #endif
  50
  51 #define MAX_GET_SD_ACCESS_DENIED_WARNINGS 1
  52 #define MAX_GET_SACL_PRIV_NOTHELD_WARNINGS 1
  53 #define MAX_CAPTURE_LONG_PATH_WARNINGS 5
  54
  55 struct win32_capture_state {
  56         unsigned long num_get_sd_access_denied;
  57         unsigned long num_get_sacl_priv_notheld;
  58         unsigned long num_long_path_warnings;
  59 };
  60
  61
  62 static const wchar_t *capture_access_denied_msg =
  63 L"         If you are not running this program as the administrator, you may\n"
  64  "         need to do so, so that all data and metadata can be backed up.\n"
  65  "         Otherwise, there may be no way to access the desired data or\n"
  66  "         metadata without taking ownership of the file or directory.\n"
  67  ;
  68
  69 int
  70 read_win32_file_prefix(const struct wim_lookup_table_entry *lte,
  71                        u64 size,
  72                        consume_data_callback_t cb,
  73                        void *ctx_or_buf,
  74                        int _ignored_flags)
  75 {
  76         int ret = 0;
  77         void *out_buf;
  78         DWORD err;
  79         u64 bytes_remaining;
  80
  81         HANDLE hFile = win32_open_file_data_only(lte->file_on_disk);
  82         if (hFile == INVALID_HANDLE_VALUE) {
  83                 err = GetLastError();
  84                 ERROR("Failed to open \"%ls\"", lte->file_on_disk);
  85                 win32_error(err);
  86                 return WIMLIB_ERR_OPEN;
  87         }
  88
  89         if (cb)
  90                 out_buf = alloca(WIM_CHUNK_SIZE);
  91         else
  92                 out_buf = ctx_or_buf;
  93
  94         bytes_remaining = size;
  95         while (bytes_remaining) {
  96                 DWORD bytesToRead, bytesRead;
  97
  98                 bytesToRead = min(WIM_CHUNK_SIZE, bytes_remaining);
  99                 if (!ReadFile(hFile, out_buf, bytesToRead, &bytesRead, NULL) ||
 100                     bytesRead != bytesToRead)
 101                 {
 102                         err = GetLastError();
 103                         ERROR("Failed to read data from \"%ls\"", lte->file_on_disk);
 104                         win32_error(err);
 105                         ret = WIMLIB_ERR_READ;
 106                         break;
 107                 }
 108                 bytes_remaining -= bytesRead;
 109                 if (cb) {
 110                         ret = (*cb)(out_buf, bytesRead, ctx_or_buf);
 111                         if (ret)
 112                                 break;
 113                 } else {
 114                         out_buf += bytesRead;
 115                 }
 116         }
 117         CloseHandle(hFile);
 118         return ret;
 119 }
 120
 121 struct win32_encrypted_read_ctx {
 122         consume_data_callback_t read_prefix_cb;
 123         void *read_prefix_ctx_or_buf;
 124         int wimlib_err_code;
 125         void *buf;
 126         size_t buf_filled;
 127         u64 bytes_remaining;
 128 };
 129
 130 static DWORD WINAPI
 131 win32_encrypted_export_cb(unsigned char *_data, void *_ctx, unsigned long len)
 132 {
 133         const void *data = _data;
 134         struct win32_encrypted_read_ctx *ctx = _ctx;
 135         int ret;
 136
 137         DEBUG("len = %lu", len);
 138         if (ctx->read_prefix_cb) {
 139                 /* The length of the buffer passed to the ReadEncryptedFileRaw()
 140                  * export callback is undocumented, so we assume it may be of
 141                  * arbitrary size. */
 142                 size_t bytes_to_buffer = min(ctx->bytes_remaining - ctx->buf_filled,
 143                                              len);
 144                 while (bytes_to_buffer) {
 145                         size_t bytes_to_copy_to_buf =
 146                                 min(bytes_to_buffer, WIM_CHUNK_SIZE - ctx->buf_filled);
 147
 148                         memcpy(ctx->buf + ctx->buf_filled, data,
 149                                bytes_to_copy_to_buf);
 150                         ctx->buf_filled += bytes_to_copy_to_buf;
 151                         data += bytes_to_copy_to_buf;
 152                         bytes_to_buffer -= bytes_to_copy_to_buf;
 153
 154                         if (ctx->buf_filled == WIM_CHUNK_SIZE ||
 155                             ctx->buf_filled == ctx->bytes_remaining)
 156                         {
 157                                 ret = (*ctx->read_prefix_cb)(ctx->buf,
 158                                                              ctx->buf_filled,
 159                                                              ctx->read_prefix_ctx_or_buf);
 160                                 if (ret) {
 161                                         ctx->wimlib_err_code = ret;
 162                                         /* Shouldn't matter what error code is returned
 163                                          * here, as long as it isn't ERROR_SUCCESS. */
 164                                         return ERROR_READ_FAULT;
 165                                 }
 166                                 ctx->bytes_remaining -= ctx->buf_filled;
 167                                 ctx->buf_filled = 0;
 168                         }
 169                 }
 170         } else {
 171                 size_t len_to_copy = min(len, ctx->bytes_remaining);
 172                 ctx->read_prefix_ctx_or_buf = mempcpy(ctx->read_prefix_ctx_or_buf,
 173                                                       data,
 174                                                       len_to_copy);
 175                 ctx->bytes_remaining -= len_to_copy;
 176         }
 177         return ERROR_SUCCESS;
 178 }
 179
 180 int
 181 read_win32_encrypted_file_prefix(const struct wim_lookup_table_entry *lte,
 182                                  u64 size,
 183                                  consume_data_callback_t cb,
 184                                  void *ctx_or_buf,
 185                                  int _ignored_flags)
 186 {
 187         struct win32_encrypted_read_ctx export_ctx;
 188         DWORD err;
 189         void *file_ctx;
 190         int ret;
 191
 192         DEBUG("Reading %"PRIu64" bytes from encryted file \"%ls\"",
 193               size, lte->file_on_disk);
 194
 195         export_ctx.read_prefix_cb = cb;
 196         export_ctx.read_prefix_ctx_or_buf = ctx_or_buf;
 197         export_ctx.wimlib_err_code = 0;
 198         if (cb) {
 199                 export_ctx.buf = MALLOC(WIM_CHUNK_SIZE);
 200                 if (!export_ctx.buf)
 201                         return WIMLIB_ERR_NOMEM;
 202         } else {
 203                 export_ctx.buf = NULL;
 204         }
 205         export_ctx.buf_filled = 0;
 206         export_ctx.bytes_remaining = size;
 207
 208         err = OpenEncryptedFileRawW(lte->file_on_disk, 0, &file_ctx);
 209         if (err != ERROR_SUCCESS) {
 210                 ERROR("Failed to open encrypted file \"%ls\" for raw read",
 211                       lte->file_on_disk);
 212                 win32_error(err);
 213                 ret = WIMLIB_ERR_OPEN;
 214                 goto out_free_buf;
 215         }
 216         err = ReadEncryptedFileRaw(win32_encrypted_export_cb,
 217                                    &export_ctx, file_ctx);
 218         if (err != ERROR_SUCCESS) {
 219                 ERROR("Failed to read encrypted file \"%ls\"",
 220                       lte->file_on_disk);
 221                 win32_error(err);
 222                 ret = export_ctx.wimlib_err_code;
 223                 if (ret == 0)
 224                         ret = WIMLIB_ERR_READ;
 225         } else if (export_ctx.bytes_remaining != 0) {
 226                 ERROR("Only could read %"PRIu64" of %"PRIu64" bytes from "
 227                       "encryted file \"%ls\"",
 228                       size - export_ctx.bytes_remaining, size,
 229                       lte->file_on_disk);
 230                 ret = WIMLIB_ERR_READ;
 231         } else {
 232                 ret = 0;
 233         }
 234         CloseEncryptedFileRaw(file_ctx);
 235 out_free_buf:
 236         FREE(export_ctx.buf);
 237         return ret;
 238 }
 239
 240
 241 static u64
 242 FILETIME_to_u64(const FILETIME *ft)
 243 {
 244         return ((u64)ft->dwHighDateTime << 32) | (u64)ft->dwLowDateTime;
 245 }
 246
 247 static int
 248 win32_get_short_name(struct wim_dentry *dentry, const wchar_t *path)
 249 {
 250         WIN32_FIND_DATAW dat;
 251         HANDLE hFind;
 252         int ret = 0;
 253
 254         /* If we can't read the short filename for some reason, we just ignore
 255          * the error and assume the file has no short name.  I don't think this
 256          * should be an issue, since the short names are essentially obsolete
 257          * anyway. */
 258         hFind = FindFirstFileW(path, &dat);
 259         if (hFind != INVALID_HANDLE_VALUE) {
 260                 if (dat.cAlternateFileName[0] != L'\0') {
 261                         DEBUG("\"%ls\": short name \"%ls\"", path, dat.cAlternateFileName);
 262                         size_t short_name_nbytes = wcslen(dat.cAlternateFileName) *
 263                                                    sizeof(wchar_t);
 264                         size_t n = short_name_nbytes + sizeof(wchar_t);
 265                         dentry->short_name = MALLOC(n);
 266                         if (dentry->short_name) {
 267                                 memcpy(dentry->short_name, dat.cAlternateFileName, n);
 268                                 dentry->short_name_nbytes = short_name_nbytes;
 269                         } else {
 270                                 ret = WIMLIB_ERR_NOMEM;
 271                         }
 272                 }
 273                 FindClose(hFind);
 274         }
 275         return ret;
 276 }
 277
 278 /*
 279  * win32_query_security_descriptor() - Query a file's security descriptor
 280  *
 281  * We need the file's security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 282  * relative format, and we currently have a handle opened with as many relevant
 283  * permissions as possible.  At this point, on Windows there are a number of
 284  * options for reading a file's security descriptor:
 285  *
 286  * GetFileSecurity():  This takes in a path and returns the
 287  * SECURITY_DESCRIPTOR_RELATIVE.  Problem: this uses an internal handle, not
 288  * ours, and the handle created internally doesn't specify
 289  * FILE_FLAG_BACKUP_SEMANTICS.  Therefore there can be access denied errors on
 290  * some files and directories, even when running as the Administrator.
 291  *
 292  * GetSecurityInfo():  This takes in a handle and returns the security
 293  * descriptor split into a bunch of different parts.  This should work, but it's
 294  * dumb because we have to put the security descriptor back together again.
 295  *
 296  * BackupRead():  This can read the security descriptor, but this is a
 297  * difficult-to-use API, probably only works as the Administrator, and the
 298  * format of the returned data is not well documented.
 299  *
 300  * NtQuerySecurityObject():  This is exactly what we need, as it takes in a
 301  * handle and returns the security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 302  * format.  Only problem is that it's a ntdll function and therefore not
 303  * officially part of the Win32 API.  Oh well.
 304  */
 305 static DWORD
 306 win32_query_security_descriptor(HANDLE hFile, const wchar_t *path,
 307                                 SECURITY_INFORMATION requestedInformation,
 308                                 PSECURITY_DESCRIPTOR *buf,
 309                                 DWORD bufsize, DWORD *lengthNeeded)
 310 {
 311 #ifdef WITH_NTDLL
 312         NTSTATUS status;
 313
 314         status = NtQuerySecurityObject(hFile, requestedInformation, buf,
 315                                        bufsize, lengthNeeded);
 316         /* Since it queries an already-open handle, NtQuerySecurityObject()
 317          * apparently returns STATUS_ACCESS_DENIED rather than
 318          * STATUS_PRIVILEGE_NOT_HELD.  */
 319         if (status == STATUS_ACCESS_DENIED)
 320                 return ERROR_PRIVILEGE_NOT_HELD;
 321         else
 322                 return RtlNtStatusToDosError(status);
 323 #else
 324         if (GetFileSecurity(path, requestedInformation, buf,
 325                             bufsize, lengthNeeded))
 326                 return ERROR_SUCCESS;
 327         else
 328                 return GetLastError();
 329 #endif
 330 }
 331
 332 static int
 333 win32_get_security_descriptor(HANDLE hFile,
 334                               const wchar_t *path,
 335                               struct wim_inode *inode,
 336                               struct wim_sd_set *sd_set,
 337                               struct win32_capture_state *state,
 338                               int add_flags)
 339 {
 340         SECURITY_INFORMATION requestedInformation;
 341         u8 _buf[1];
 342         u8 *buf;
 343         size_t bufsize;
 344         DWORD lenNeeded;
 345         DWORD err;
 346         int ret;
 347
 348         requestedInformation = DACL_SECURITY_INFORMATION |
 349                                SACL_SECURITY_INFORMATION |
 350                                OWNER_SECURITY_INFORMATION |
 351                                GROUP_SECURITY_INFORMATION;
 352         buf = _buf;
 353         bufsize = sizeof(_buf);
 354         for (;;) {
 355                 err = win32_query_security_descriptor(hFile, path,
 356                                                       requestedInformation,
 357                                                       (PSECURITY_DESCRIPTOR)buf,
 358                                                       bufsize, &lenNeeded);
 359                 switch (err) {
 360                 case ERROR_SUCCESS:
 361                         goto have_descriptor;
 362                 case ERROR_INSUFFICIENT_BUFFER:
 363                         wimlib_assert(buf == _buf);
 364                         buf = MALLOC(lenNeeded);
 365                         if (!buf)
 366                                 return WIMLIB_ERR_NOMEM;
 367                         bufsize = lenNeeded;
 368                         break;
 369                 case ERROR_PRIVILEGE_NOT_HELD:
 370                         if (add_flags & WIMLIB_ADD_FLAG_STRICT_ACLS)
 371                                 goto fail;
 372                         if (requestedInformation & SACL_SECURITY_INFORMATION) {
 373                                 state->num_get_sacl_priv_notheld++;
 374                                 requestedInformation &= ~SACL_SECURITY_INFORMATION;
 375                                 break;
 376                         }
 377                         /* Fall through */
 378                 case ERROR_ACCESS_DENIED:
 379                         if (add_flags & WIMLIB_ADD_FLAG_STRICT_ACLS)
 380                                 goto fail;
 381                         state->num_get_sd_access_denied++;
 382                         ret = 0;
 383                         goto out_free_buf;
 384                 default:
 385                 fail:
 386                         errno = win32_error_to_errno(err);
 387                         ERROR("Failed to read security descriptor of \"%ls\"", path);
 388                         ret = WIMLIB_ERR_READ;
 389                         goto out_free_buf;
 390                 }
 391         }
 392
 393 have_descriptor:
 394         inode->i_security_id = sd_set_add_sd(sd_set, buf, lenNeeded);
 395         if (inode->i_security_id < 0) {
 396                 ret = WIMLIB_ERR_NOMEM;
 397                 goto out_free_buf;
 398         }
 399         ret = 0;
 400 out_free_buf:
 401         if (buf != _buf)
 402                 FREE(buf);
 403         return ret;
 404 }
 405
 406 static int
 407 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 408                                   wchar_t *path,
 409                                   size_t path_num_chars,
 410                                   struct add_image_params *params,
 411                                   struct win32_capture_state *state,
 412                                   unsigned vol_flags);
 413
 414 /* Reads the directory entries of directory using a Win32 API and recursively
 415  * calls win32_build_dentry_tree() on them. */
 416 static int
 417 win32_recurse_directory(struct wim_dentry *root,
 418                         wchar_t *dir_path,
 419                         size_t dir_path_num_chars,
 420                         struct add_image_params *params,
 421                         struct win32_capture_state *state,
 422                         unsigned vol_flags)
 423 {
 424         WIN32_FIND_DATAW dat;
 425         HANDLE hFind;
 426         DWORD err;
 427         int ret;
 428
 429         DEBUG("Recurse to directory \"%ls\"", dir_path);
 430
 431         /* Begin reading the directory by calling FindFirstFileW.  Unlike UNIX
 432          * opendir(), FindFirstFileW has file globbing built into it.  But this
 433          * isn't what we actually want, so just add a dummy glob to get all
 434          * entries. */
 435         dir_path[dir_path_num_chars] = OS_PREFERRED_PATH_SEPARATOR;
 436         dir_path[dir_path_num_chars + 1] = L'*';
 437         dir_path[dir_path_num_chars + 2] = L'\0';
 438         hFind = FindFirstFileW(dir_path, &dat);
 439         dir_path[dir_path_num_chars] = L'\0';
 440
 441         if (hFind == INVALID_HANDLE_VALUE) {
 442                 err = GetLastError();
 443                 if (err == ERROR_FILE_NOT_FOUND) {
 444                         return 0;
 445                 } else {
 446                         ERROR("Failed to read directory \"%ls\"", dir_path);
 447                         win32_error(err);
 448                         return WIMLIB_ERR_READ;
 449                 }
 450         }
 451         ret = 0;
 452         do {
 453                 /* Skip . and .. entries */
 454                 if (dat.cFileName[0] == L'.' &&
 455                     (dat.cFileName[1] == L'\0' ||
 456                      (dat.cFileName[1] == L'.' &&
 457                       dat.cFileName[2] == L'\0')))
 458                         continue;
 459                 size_t filename_len = wcslen(dat.cFileName);
 460
 461                 dir_path[dir_path_num_chars] = OS_PREFERRED_PATH_SEPARATOR;
 462                 wmemcpy(dir_path + dir_path_num_chars + 1,
 463                         dat.cFileName,
 464                         filename_len + 1);
 465
 466                 struct wim_dentry *child;
 467                 size_t path_len = dir_path_num_chars + 1 + filename_len;
 468                 ret = win32_build_dentry_tree_recursive(&child,
 469                                                         dir_path,
 470                                                         path_len,
 471                                                         params,
 472                                                         state,
 473                                                         vol_flags);
 474                 dir_path[dir_path_num_chars] = L'\0';
 475                 if (ret)
 476                         goto out_find_close;
 477                 if (child)
 478                         dentry_add_child(root, child);
 479         } while (FindNextFileW(hFind, &dat));
 480         err = GetLastError();
 481         if (err != ERROR_NO_MORE_FILES) {
 482                 ERROR("Failed to read directory \"%ls\"", dir_path);
 483                 win32_error(err);
 484                 if (ret == 0)
 485                         ret = WIMLIB_ERR_READ;
 486         }
 487 out_find_close:
 488         FindClose(hFind);
 489         return ret;
 490 }
 491
 492 /* Reparse point fixup status code */
 493 enum rp_status {
 494         /* Reparse point corresponded to an absolute symbolic link or junction
 495          * point that pointed outside the directory tree being captured, and
 496          * therefore was excluded. */
 497         RP_EXCLUDED       = 0x0,
 498
 499         /* Reparse point was not fixed as it was either a relative symbolic
 500          * link, a mount point, or something else we could not understand. */
 501         RP_NOT_FIXED      = 0x1,
 502
 503         /* Reparse point corresponded to an absolute symbolic link or junction
 504          * point that pointed inside the directory tree being captured, where
 505          * the target was specified by a "full" \??\ prefixed path, and
 506          * therefore was fixed to be relative to the root of the directory tree
 507          * being captured. */
 508         RP_FIXED_FULLPATH = 0x2,
 509
 510         /* Same as RP_FIXED_FULLPATH, except the absolute link target did not
 511          * have the \??\ prefix.  It may have begun with a drive letter though.
 512          * */
 513         RP_FIXED_ABSPATH  = 0x4,
 514
 515         /* Either RP_FIXED_FULLPATH or RP_FIXED_ABSPATH. */
 516         RP_FIXED          = RP_FIXED_FULLPATH | RP_FIXED_ABSPATH,
 517 };
 518
 519 /* Given the "substitute name" target of a Windows reparse point, try doing a
 520  * fixup where we change it to be absolute relative to the root of the directory
 521  * tree being captured.
 522  *
 523  * Note that this is only executed when WIMLIB_ADD_FLAG_RPFIX has been
 524  * set.
 525  *
 526  * @capture_root_ino and @capture_root_dev indicate the inode number and device
 527  * of the root of the directory tree being captured.  They are meant to identify
 528  * this directory (as an alternative to its actual path, which could potentially
 529  * be reached via multiple destinations due to other symbolic links).  This may
 530  * not work properly on FAT, which doesn't seem to supply proper inode numbers
 531  * or file IDs.  However, FAT doesn't support reparse points so this function
 532  * wouldn't even be called anyway.
 533  */
 534 static enum rp_status
 535 win32_capture_maybe_rpfix_target(wchar_t *target, u16 *target_nbytes_p,
 536                                  u64 capture_root_ino, u64 capture_root_dev,
 537                                  u32 rptag)
 538 {
 539         u16 target_nchars = *target_nbytes_p / 2;
 540         size_t stripped_chars;
 541         wchar_t *orig_target;
 542         int ret;
 543
 544         ret = parse_substitute_name(target, *target_nbytes_p, rptag);
 545         if (ret < 0)
 546                 return RP_NOT_FIXED;
 547         stripped_chars = ret;
 548         if (stripped_chars)
 549                 stripped_chars -= 2;
 550         target[target_nchars] = L'\0';
 551         orig_target = target;
 552         target = capture_fixup_absolute_symlink(target + stripped_chars,
 553                                                 capture_root_ino, capture_root_dev);
 554         if (!target)
 555                 return RP_EXCLUDED;
 556         target_nchars = wcslen(target);
 557         wmemmove(orig_target + stripped_chars, target, target_nchars + 1);
 558         *target_nbytes_p = (target_nchars + stripped_chars) * sizeof(wchar_t);
 559         DEBUG("Fixed reparse point (new target: \"%ls\")", orig_target);
 560         if (stripped_chars)
 561                 return RP_FIXED_FULLPATH;
 562         else
 563                 return RP_FIXED_ABSPATH;
 564 }
 565
 566 /* Returns: `enum rp_status' value on success; negative WIMLIB_ERR_* value on
 567  * failure. */
 568 static int
 569 win32_capture_try_rpfix(u8 *rpbuf, u16 *rpbuflen_p,
 570                         u64 capture_root_ino, u64 capture_root_dev,
 571                         const wchar_t *path)
 572 {
 573         struct reparse_data rpdata;
 574         int ret;
 575         enum rp_status rp_status;
 576
 577         ret = parse_reparse_data(rpbuf, *rpbuflen_p, &rpdata);
 578         if (ret)
 579                 return -ret;
 580
 581         rp_status = win32_capture_maybe_rpfix_target(rpdata.substitute_name,
 582                                                      &rpdata.substitute_name_nbytes,
 583                                                      capture_root_ino,
 584                                                      capture_root_dev,
 585                                                      le32_to_cpu(*(le32*)rpbuf));
 586         if (rp_status & RP_FIXED) {
 587                 wimlib_assert(rpdata.substitute_name_nbytes % 2 == 0);
 588                 utf16lechar substitute_name_copy[rpdata.substitute_name_nbytes / 2];
 589                 wmemcpy(substitute_name_copy, rpdata.substitute_name,
 590                         rpdata.substitute_name_nbytes / 2);
 591                 rpdata.substitute_name = substitute_name_copy;
 592                 rpdata.print_name = substitute_name_copy;
 593                 rpdata.print_name_nbytes = rpdata.substitute_name_nbytes;
 594                 if (rp_status == RP_FIXED_FULLPATH) {
 595                         /* "full path", meaning \??\ prefixed.  We should not
 596                          * include this prefix in the print name, as it is
 597                          * apparently meant for the filesystem driver only. */
 598                         rpdata.print_name += 4;
 599                         rpdata.print_name_nbytes -= 8;
 600                 }
 601                 ret = make_reparse_buffer(&rpdata, rpbuf, rpbuflen_p);
 602                 if (ret == 0)
 603                         ret = rp_status;
 604                 else
 605                         ret = -ret;
 606         } else {
 607                 if (rp_status == RP_EXCLUDED) {
 608                         size_t print_name_nchars = rpdata.print_name_nbytes / 2;
 609                         wchar_t print_name0[print_name_nchars + 1];
 610                         print_name0[print_name_nchars] = L'\0';
 611                         wmemcpy(print_name0, rpdata.print_name, print_name_nchars);
 612                         WARNING("Ignoring %ls pointing out of capture directory:\n"
 613                                 "          \"%ls\" -> \"%ls\"\n"
 614                                 "          (Use --norpfix to capture all symbolic links "
 615                                 "and junction points as-is)",
 616                                 (rpdata.rptag == WIM_IO_REPARSE_TAG_SYMLINK) ?
 617                                         L"absolute symbolic link" : L"junction point",
 618                                 path, print_name0);
 619                 }
 620                 ret = rp_status;
 621         }
 622         return ret;
 623 }
 624
 625 /*
 626  * Loads the reparse point data from a reparse point into memory, optionally
 627  * fixing the targets of absolute symbolic links and junction points to be
 628  * relative to the root of capture.
 629  *
 630  * @hFile:  Open handle to the reparse point.
 631  * @path:   Path to the reparse point.  Used for error messages only.
 632  * @params: Additional parameters, including whether to do reparse point fixups
 633  *          or not.
 634  * @rpbuf:  Buffer of length at least REPARSE_POINT_MAX_SIZE bytes into which
 635  *          the reparse point buffer will be loaded.
 636  * @rpbuflen_ret:  On success, the length of the reparse point buffer in bytes
 637  *                 is written to this location.
 638  *
 639  * Returns:
 640  *      On success, returns an `enum rp_status' value that indicates if and/or
 641  *      how the reparse point fixup was done.
 642  *
 643  *      On failure, returns a negative value that is a negated WIMLIB_ERR_*
 644  *      code.
 645  */
 646 static int
 647 win32_get_reparse_data(HANDLE hFile, const wchar_t *path,
 648                        struct add_image_params *params,
 649                        u8 *rpbuf, u16 *rpbuflen_ret)
 650 {
 651         DWORD bytesReturned;
 652         u32 reparse_tag;
 653         int ret;
 654         u16 rpbuflen;
 655
 656         DEBUG("Loading reparse data from \"%ls\"", path);
 657         if (!DeviceIoControl(hFile, FSCTL_GET_REPARSE_POINT,
 658                              NULL, /* "Not used with this operation; set to NULL" */
 659                              0, /* "Not used with this operation; set to 0" */
 660                              rpbuf, /* "A pointer to a buffer that
 661                                                    receives the reparse point data */
 662                              REPARSE_POINT_MAX_SIZE, /* "The size of the output
 663                                                         buffer, in bytes */
 664                              &bytesReturned,
 665                              NULL))
 666         {
 667                 DWORD err = GetLastError();
 668                 ERROR("Failed to get reparse data of \"%ls\"", path);
 669                 win32_error(err);
 670                 return -WIMLIB_ERR_READ;
 671         }
 672         if (bytesReturned < 8 || bytesReturned > REPARSE_POINT_MAX_SIZE) {
 673                 ERROR("Reparse data on \"%ls\" is invalid", path);
 674                 return -WIMLIB_ERR_INVALID_REPARSE_DATA;
 675         }
 676
 677         rpbuflen = bytesReturned;
 678         reparse_tag = le32_to_cpu(*(le32*)rpbuf);
 679         if (params->add_flags & WIMLIB_ADD_FLAG_RPFIX &&
 680             (reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
 681              reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT))
 682         {
 683                 /* Try doing reparse point fixup */
 684                 ret = win32_capture_try_rpfix(rpbuf,
 685                                               &rpbuflen,
 686                                               params->capture_root_ino,
 687                                               params->capture_root_dev,
 688                                               path);
 689         } else {
 690                 ret = RP_NOT_FIXED;
 691         }
 692         *rpbuflen_ret = rpbuflen;
 693         return ret;
 694 }
 695
 696 static DWORD WINAPI
 697 win32_tally_encrypted_size_cb(unsigned char *_data, void *_ctx,
 698                               unsigned long len)
 699 {
 700         *(u64*)_ctx += len;
 701         return ERROR_SUCCESS;
 702 }
 703
 704 static int
 705 win32_get_encrypted_file_size(const wchar_t *path, u64 *size_ret)
 706 {
 707         DWORD err;
 708         void *file_ctx;
 709         int ret;
 710
 711         *size_ret = 0;
 712         err = OpenEncryptedFileRawW(path, 0, &file_ctx);
 713         if (err != ERROR_SUCCESS) {
 714                 ERROR("Failed to open encrypted file \"%ls\" for raw read", path);
 715                 win32_error(err);
 716                 return WIMLIB_ERR_OPEN;
 717         }
 718         err = ReadEncryptedFileRaw(win32_tally_encrypted_size_cb,
 719                                    size_ret, file_ctx);
 720         if (err != ERROR_SUCCESS) {
 721                 ERROR("Failed to read raw encrypted data from \"%ls\"", path);
 722                 win32_error(err);
 723                 ret = WIMLIB_ERR_READ;
 724         } else {
 725                 ret = 0;
 726         }
 727         CloseEncryptedFileRaw(file_ctx);
 728         return ret;
 729 }
 730
 731 /* Scans an unnamed or named stream of a Win32 file (not a reparse point
 732  * stream); calculates its SHA1 message digest and either creates a `struct
 733  * wim_lookup_table_entry' in memory for it, or uses an existing 'struct
 734  * wim_lookup_table_entry' for an identical stream.
 735  *
 736  * @path:               Path to the file (UTF-16LE).
 737  *
 738  * @path_num_chars:     Number of 2-byte characters in @path.
 739  *
 740  * @inode:              WIM inode to save the stream into.
 741  *
 742  * @lookup_table:       Stream lookup table for the WIM.
 743  *
 744  * @dat:                A `WIN32_FIND_STREAM_DATA' structure that specifies the
 745  *                      stream name.
 746  *
 747  * Returns 0 on success; nonzero on failure.
 748  */
 749 static int
 750 win32_capture_stream(const wchar_t *path,
 751                      size_t path_num_chars,
 752                      struct wim_inode *inode,
 753                      struct wim_lookup_table *lookup_table,
 754                      WIN32_FIND_STREAM_DATA *dat)
 755 {
 756         struct wim_ads_entry *ads_entry;
 757         struct wim_lookup_table_entry *lte;
 758         int ret;
 759         wchar_t *stream_name, *colon;
 760         size_t stream_name_nchars;
 761         bool is_named_stream;
 762         wchar_t *spath;
 763         size_t spath_nchars;
 764         size_t spath_buf_nbytes;
 765         const wchar_t *relpath_prefix;
 766         const wchar_t *colonchar;
 767
 768         DEBUG("Capture \"%ls\" stream \"%ls\"", path, dat->cStreamName);
 769
 770         /* The stream name should be returned as :NAME:TYPE */
 771         stream_name = dat->cStreamName;
 772         if (*stream_name != L':')
 773                 goto out_invalid_stream_name;
 774         stream_name += 1;
 775         colon = wcschr(stream_name, L':');
 776         if (colon == NULL)
 777                 goto out_invalid_stream_name;
 778
 779         if (wcscmp(colon + 1, L"$DATA")) {
 780                 /* Not a DATA stream */
 781                 ret = 0;
 782                 goto out;
 783         }
 784
 785         *colon = '\0';
 786
 787         stream_name_nchars = colon - stream_name;
 788         is_named_stream = (stream_name_nchars != 0);
 789
 790         if (is_named_stream) {
 791                 /* Allocate an ADS entry for the named stream. */
 792                 ads_entry = inode_add_ads_utf16le(inode, stream_name,
 793                                                   stream_name_nchars * sizeof(wchar_t));
 794                 if (!ads_entry) {
 795                         ret = WIMLIB_ERR_NOMEM;
 796                         goto out;
 797                 }
 798         }
 799
 800         /* If zero length stream, no lookup table entry needed. */
 801         if ((u64)dat->StreamSize.QuadPart == 0) {
 802                 ret = 0;
 803                 goto out;
 804         }
 805
 806         /* Create a UTF-16LE string @spath that gives the filename, then a
 807          * colon, then the stream name.  Or, if it's an unnamed stream, just the
 808          * filename.  It is MALLOC()'ed so that it can be saved in the
 809          * wim_lookup_table_entry if needed.
 810          *
 811          * As yet another special case, relative paths need to be changed to
 812          * begin with an explicit "./" so that, for example, a file t:ads, where
 813          * :ads is the part we added, is not interpreted as a file on the t:
 814          * drive. */
 815         spath_nchars = path_num_chars;
 816         relpath_prefix = L"";
 817         colonchar = L"";
 818         if (is_named_stream) {
 819                 spath_nchars += 1 + stream_name_nchars;
 820                 colonchar = L":";
 821                 if (path_num_chars == 1 && !is_any_path_separator(path[0])) {
 822                         spath_nchars += 2;
 823                         static const wchar_t _relpath_prefix[] =
 824                                 {L'.', OS_PREFERRED_PATH_SEPARATOR, L'\0'};
 825                         relpath_prefix = _relpath_prefix;
 826                 }
 827         }
 828
 829         spath_buf_nbytes = (spath_nchars + 1) * sizeof(wchar_t);
 830         spath = MALLOC(spath_buf_nbytes);
 831
 832         swprintf(spath, L"%ls%ls%ls%ls",
 833                  relpath_prefix, path, colonchar, stream_name);
 834
 835         /* Make a new wim_lookup_table_entry */
 836         lte = new_lookup_table_entry();
 837         if (!lte) {
 838                 ret = WIMLIB_ERR_NOMEM;
 839                 goto out_free_spath;
 840         }
 841         lte->file_on_disk = spath;
 842         spath = NULL;
 843         if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED && !is_named_stream) {
 844                 u64 encrypted_size;
 845                 lte->resource_location = RESOURCE_WIN32_ENCRYPTED;
 846                 ret = win32_get_encrypted_file_size(path, &encrypted_size);
 847                 if (ret)
 848                         goto out_free_spath;
 849                 lte->resource_entry.original_size = encrypted_size;
 850         } else {
 851                 lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 852                 lte->resource_entry.original_size = (u64)dat->StreamSize.QuadPart;
 853         }
 854
 855         u32 stream_id;
 856         if (is_named_stream) {
 857                 stream_id = ads_entry->stream_id;
 858                 ads_entry->lte = lte;
 859         } else {
 860                 stream_id = 0;
 861                 inode->i_lte = lte;
 862         }
 863         lookup_table_insert_unhashed(lookup_table, lte, inode, stream_id);
 864         ret = 0;
 865 out_free_spath:
 866         FREE(spath);
 867 out:
 868         return ret;
 869 out_invalid_stream_name:
 870         ERROR("Invalid stream name: \"%ls:%ls\"", path, dat->cStreamName);
 871         ret = WIMLIB_ERR_READ;
 872         goto out;
 873 }
 874
 875 /* Load information about the streams of an open file into a WIM inode.
 876  *
 877  * By default, we use the NtQueryInformationFile() system call instead of
 878  * FindFirstStream() and FindNextStream().  This is done for two reasons:
 879  *
 880  * - FindFirstStream() opens its own handle to the file or directory and
 881  *   apparently does so without specifying FILE_FLAG_BACKUP_SEMANTICS, thereby
 882  *   causing access denied errors on certain files (even when running as the
 883  *   Administrator).
 884  * - FindFirstStream() and FindNextStream() is only available on Windows Vista
 885  *   and later, whereas the stream support in NtQueryInformationFile() was
 886  *   already present in Windows XP.
 887  */
 888 static int
 889 win32_capture_streams(HANDLE hFile,
 890                       const wchar_t *path,
 891                       size_t path_num_chars,
 892                       struct wim_inode *inode,
 893                       struct wim_lookup_table *lookup_table,
 894                       u64 file_size,
 895                       unsigned vol_flags)
 896 {
 897         WIN32_FIND_STREAM_DATA dat;
 898         int ret;
 899 #ifdef WITH_NTDLL
 900         u8 _buf[8192] _aligned_attribute(8);
 901         u8 *buf;
 902         size_t bufsize;
 903         IO_STATUS_BLOCK io_status;
 904         NTSTATUS status;
 905         const FILE_STREAM_INFORMATION *info;
 906 #else
 907         HANDLE hFind;
 908         DWORD err;
 909 #endif
 910
 911         DEBUG("Capturing streams from \"%ls\"", path);
 912
 913         if (!(vol_flags & FILE_NAMED_STREAMS))
 914                 goto unnamed_only;
 915 #ifndef WITH_NTDLL
 916         if (win32func_FindFirstStreamW == NULL)
 917                 goto unnamed_only;
 918 #endif
 919
 920 #ifdef WITH_NTDLL
 921         buf = _buf;
 922         bufsize = sizeof(_buf);
 923
 924         /* Get a buffer containing the stream information.  */
 925         for (;;) {
 926                 status = NtQueryInformationFile(hFile, &io_status, buf, bufsize,
 927                                                 FileStreamInformation);
 928                 if (status == STATUS_SUCCESS) {
 929                         break;
 930                 } else if (status == STATUS_BUFFER_OVERFLOW) {
 931                         u8 *newbuf;
 932
 933                         bufsize *= 2;
 934                         if (buf == _buf)
 935                                 newbuf = MALLOC(bufsize);
 936                         else
 937                                 newbuf = REALLOC(buf, bufsize);
 938
 939                         if (!newbuf) {
 940                                 ret = WIMLIB_ERR_NOMEM;
 941                                 goto out_free_buf;
 942                         }
 943                         buf = newbuf;
 944                 } else {
 945                         errno = win32_error_to_errno(RtlNtStatusToDosError(status));
 946                         ERROR_WITH_ERRNO("Failed to read streams of %ls", path);
 947                         ret = WIMLIB_ERR_READ;
 948                         goto out_free_buf;
 949                 }
 950         }
 951
 952         if (io_status.Information == 0) {
 953                 /* No stream information.  */
 954                 ret = 0;
 955                 goto out_free_buf;
 956         }
 957
 958         /* Parse one or more stream information structures.  */
 959         info = (const FILE_STREAM_INFORMATION*)buf;
 960         for (;;) {
 961                 if (info->StreamNameLength <= sizeof(dat.cStreamName) - 2) {
 962                         dat.StreamSize = info->StreamSize;
 963                         memcpy(dat.cStreamName, info->StreamName, info->StreamNameLength);
 964                         dat.cStreamName[info->StreamNameLength / 2] = L'\0';
 965
 966                         /* Capture the stream.  */
 967                         ret = win32_capture_stream(path, path_num_chars, inode,
 968                                                    lookup_table, &dat);
 969                         if (ret)
 970                                 goto out_free_buf;
 971                 }
 972                 if (info->NextEntryOffset == 0) {
 973                         /* No more stream information.  */
 974                         ret = 0;
 975                         break;
 976                 }
 977                 /* Advance to next stream information.  */
 978                 info = (const FILE_STREAM_INFORMATION*)
 979                                 ((const u8*)info + info->NextEntryOffset);
 980         }
 981 out_free_buf:
 982         /* Free buffer if allocated on heap.  */
 983         if (buf != _buf)
 984                 FREE(buf);
 985         return ret;
 986
 987 #else /* WITH_NTDLL */
 988         hFind = win32func_FindFirstStreamW(path, FindStreamInfoStandard, &dat, 0);
 989         if (hFind == INVALID_HANDLE_VALUE) {
 990                 err = GetLastError();
 991                 if (err == ERROR_CALL_NOT_IMPLEMENTED)
 992                         goto unnamed_only;
 993
 994                 /* Seems legal for this to return ERROR_HANDLE_EOF on reparse
 995                  * points and directories */
 996                 if ((inode->i_attributes &
 997                     (FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_DIRECTORY))
 998                     && err == ERROR_HANDLE_EOF)
 999                 {
1000                         DEBUG("ERROR_HANDLE_EOF (ok)");
1001                         return 0;
1002                 } else {
1003                         if (err == ERROR_ACCESS_DENIED) {
1004                                 WARNING("Failed to look up data streams "
1005                                         "of \"%ls\": Access denied!\n%ls",
1006                                         path, capture_access_denied_msg);
1007                                 return 0;
1008                         } else {
1009                                 ERROR("Failed to look up data streams "
1010                                       "of \"%ls\"", path);
1011                                 win32_error(err);
1012                                 return WIMLIB_ERR_READ;
1013                         }
1014                 }
1015         }
1016         do {
1017                 ret = win32_capture_stream(path,
1018                                            path_num_chars,
1019                                            inode, lookup_table,
1020                                            &dat);
1021                 if (ret)
1022                         goto out_find_close;
1023         } while (win32func_FindNextStreamW(hFind, &dat));
1024         err = GetLastError();
1025         if (err != ERROR_HANDLE_EOF) {
1026                 ERROR("Win32 API: Error reading data streams from \"%ls\"", path);
1027                 win32_error(err);
1028                 ret = WIMLIB_ERR_READ;
1029         }
1030 out_find_close:
1031         FindClose(hFind);
1032         return ret;
1033 #endif /* !WITH_NTDLL */
1034
1035 unnamed_only:
1036         /* FindFirstStreamW() API is not available, or the volume does not
1037          * support named streams.  Only capture the unnamed data stream. */
1038         DEBUG("Only capturing unnamed data stream");
1039         if (!(inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY |
1040                                      FILE_ATTRIBUTE_REPARSE_POINT)))
1041         {
1042                 wcscpy(dat.cStreamName, L"::$DATA");
1043                 dat.StreamSize.QuadPart = file_size;
1044                 ret = win32_capture_stream(path,
1045                                            path_num_chars,
1046                                            inode, lookup_table,
1047                                            &dat);
1048                 if (ret)
1049                         return ret;
1050         }
1051         return ret;
1052 }
1053
1054 static int
1055 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
1056                                   wchar_t *path,
1057                                   size_t path_num_chars,
1058                                   struct add_image_params *params,
1059                                   struct win32_capture_state *state,
1060                                   unsigned vol_flags)
1061 {
1062         struct wim_dentry *root = NULL;
1063         struct wim_inode *inode;
1064         DWORD err;
1065         u64 file_size;
1066         int ret;
1067         u8 *rpbuf;
1068         u16 rpbuflen;
1069         u16 not_rpfixed;
1070         HANDLE hFile;
1071         DWORD desiredAccess;
1072
1073         params->progress.scan.cur_path = path;
1074
1075         if (exclude_path(path, path_num_chars, params->config, true)) {
1076                 if (params->add_flags & WIMLIB_ADD_FLAG_ROOT) {
1077                         ERROR("Cannot exclude the root directory from capture");
1078                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
1079                         goto out;
1080                 }
1081                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_EXCLUDED);
1082                 ret = 0;
1083                 goto out;
1084         }
1085
1086 #if 0
1087         if (path_num_chars >= 4 &&
1088             !wmemcmp(path, L"\\\\?\\", 4) &&
1089             path_num_chars + 1 - 4 > MAX_PATH &&
1090             state->num_long_path_warnings < MAX_CAPTURE_LONG_PATH_WARNINGS)
1091         {
1092                 WARNING("Path \"%ls\" exceeds MAX_PATH", path);
1093                 if (++state->num_long_path_warnings == MAX_CAPTURE_LONG_PATH_WARNINGS)
1094                         WARNING("Suppressing further warnings about long paths.");
1095         }
1096 #endif
1097
1098         do_capture_progress(params, WIMLIB_SCAN_DENTRY_OK);
1099
1100         desiredAccess = FILE_READ_DATA | FILE_READ_ATTRIBUTES |
1101                         READ_CONTROL | ACCESS_SYSTEM_SECURITY;
1102 again:
1103         hFile = win32_open_existing_file(path, desiredAccess);
1104         if (hFile == INVALID_HANDLE_VALUE) {
1105                 err = GetLastError();
1106                 if (err == ERROR_ACCESS_DENIED || err == ERROR_PRIVILEGE_NOT_HELD) {
1107                         if (desiredAccess & ACCESS_SYSTEM_SECURITY) {
1108                                 desiredAccess &= ~ACCESS_SYSTEM_SECURITY;
1109                                 goto again;
1110                         }
1111                         if (desiredAccess & READ_CONTROL) {
1112                                 desiredAccess &= ~READ_CONTROL;
1113                                 goto again;
1114                         }
1115                 }
1116                 set_errno_from_GetLastError();
1117                 ERROR_WITH_ERRNO("Failed to open \"%ls\" for reading", path);
1118                 ret = WIMLIB_ERR_OPEN;
1119                 goto out;
1120         }
1121
1122         BY_HANDLE_FILE_INFORMATION file_info;
1123         if (!GetFileInformationByHandle(hFile, &file_info)) {
1124                 set_errno_from_GetLastError();
1125                 ERROR_WITH_ERRNO("Failed to get file information for \"%ls\"",
1126                                  path);
1127                 ret = WIMLIB_ERR_STAT;
1128                 goto out_close_handle;
1129         }
1130
1131         if (file_info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1132                 rpbuf = alloca(REPARSE_POINT_MAX_SIZE);
1133                 ret = win32_get_reparse_data(hFile, path, params,
1134                                              rpbuf, &rpbuflen);
1135                 if (ret < 0) {
1136                         /* WIMLIB_ERR_* (inverted) */
1137                         ret = -ret;
1138                         goto out_close_handle;
1139                 } else if (ret & RP_FIXED) {
1140                         not_rpfixed = 0;
1141                 } else if (ret == RP_EXCLUDED) {
1142                         ret = 0;
1143                         goto out_close_handle;
1144                 } else {
1145                         not_rpfixed = 1;
1146                 }
1147         }
1148
1149         /* Create a WIM dentry with an associated inode, which may be shared.
1150          *
1151          * However, we need to explicitly check for directories and files with
1152          * only 1 link and refuse to hard link them.  This is because Windows
1153          * has a bug where it can return duplicate File IDs for files and
1154          * directories on the FAT filesystem. */
1155         ret = inode_table_new_dentry(&params->inode_table,
1156                                      path_basename_with_len(path, path_num_chars),
1157                                      ((u64)file_info.nFileIndexHigh << 32) |
1158                                          (u64)file_info.nFileIndexLow,
1159                                      file_info.dwVolumeSerialNumber,
1160                                      (file_info.nNumberOfLinks <= 1 ||
1161                                         (file_info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)),
1162                                      &root);
1163         if (ret)
1164                 goto out_close_handle;
1165
1166         ret = win32_get_short_name(root, path);
1167         if (ret)
1168                 goto out_close_handle;
1169
1170         inode = root->d_inode;
1171
1172         if (inode->i_nlink > 1) /* Shared inode; nothing more to do */
1173                 goto out_close_handle;
1174
1175         inode->i_attributes = file_info.dwFileAttributes;
1176         inode->i_creation_time = FILETIME_to_u64(&file_info.ftCreationTime);
1177         inode->i_last_write_time = FILETIME_to_u64(&file_info.ftLastWriteTime);
1178         inode->i_last_access_time = FILETIME_to_u64(&file_info.ftLastAccessTime);
1179         inode->i_resolved = 1;
1180
1181         params->add_flags &= ~WIMLIB_ADD_FLAG_ROOT;
1182
1183         if (!(params->add_flags & WIMLIB_ADD_FLAG_NO_ACLS)
1184             && (vol_flags & FILE_PERSISTENT_ACLS))
1185         {
1186                 ret = win32_get_security_descriptor(hFile, path, inode,
1187                                                     &params->sd_set, state,
1188                                                     params->add_flags);
1189                 if (ret)
1190                         goto out_close_handle;
1191         }
1192
1193         file_size = ((u64)file_info.nFileSizeHigh << 32) |
1194                      (u64)file_info.nFileSizeLow;
1195
1196
1197         /* Capture the unnamed data stream (only should be present for regular
1198          * files) and any alternate data streams. */
1199         ret = win32_capture_streams(hFile,
1200                                     path,
1201                                     path_num_chars,
1202                                     inode,
1203                                     params->lookup_table,
1204                                     file_size,
1205                                     vol_flags);
1206         if (ret)
1207                 goto out_close_handle;
1208
1209         CloseHandle(hFile);
1210
1211         if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1212                 /* Reparse point: set the reparse data (which we read already)
1213                  * */
1214                 inode->i_not_rpfixed = not_rpfixed;
1215                 inode->i_reparse_tag = le32_to_cpu(*(le32*)rpbuf);
1216                 ret = inode_set_unnamed_stream(inode, rpbuf + 8, rpbuflen - 8,
1217                                                params->lookup_table);
1218         } else if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
1219                 /* Directory (not a reparse point) --- recurse to children */
1220                 ret = win32_recurse_directory(root,
1221                                               path,
1222                                               path_num_chars,
1223                                               params,
1224                                               state,
1225                                               vol_flags);
1226         }
1227         goto out;
1228 out_close_handle:
1229         CloseHandle(hFile);
1230 out:
1231         if (ret == 0)
1232                 *root_ret = root;
1233         else
1234                 free_dentry_tree(root, params->lookup_table);
1235         return ret;
1236 }
1237
1238 static void
1239 win32_do_capture_warnings(const wchar_t *path,
1240                           const struct win32_capture_state *state,
1241                           int add_flags)
1242 {
1243         if (state->num_get_sacl_priv_notheld == 0 &&
1244             state->num_get_sd_access_denied == 0)
1245                 return;
1246
1247         WARNING("Scan of \"%ls\" complete, but with one or more warnings:", path);
1248         if (state->num_get_sacl_priv_notheld != 0) {
1249                 WARNING("- Could not capture SACL (System Access Control List)\n"
1250                         "            on %lu files or directories.",
1251                         state->num_get_sacl_priv_notheld);
1252         }
1253         if (state->num_get_sd_access_denied != 0) {
1254                 WARNING("- Could not capture security descriptor at all\n"
1255                         "            on %lu files or directories.",
1256                         state->num_get_sd_access_denied);
1257         }
1258         WARNING("To fully capture all security descriptors, run the program\n"
1259                 "          with Administrator rights.");
1260 }
1261
1262 #define WINDOWS_NT_MAX_PATH 32768
1263
1264 /* Win32 version of capturing a directory tree */
1265 int
1266 win32_build_dentry_tree(struct wim_dentry **root_ret,
1267                         const wchar_t *root_disk_path,
1268                         struct add_image_params *params)
1269 {
1270         size_t path_nchars;
1271         wchar_t *path;
1272         int ret;
1273         struct win32_capture_state state;
1274         unsigned vol_flags;
1275         DWORD dret;
1276         bool need_prefix_free = false;
1277
1278 #ifndef WITH_NTDLL
1279         if (!win32func_FindFirstStreamW) {
1280                 WARNING("Running on Windows XP or earlier; "
1281                         "alternate data streams will not be captured.");
1282         }
1283 #endif
1284
1285         path_nchars = wcslen(root_disk_path);
1286         if (path_nchars > WINDOWS_NT_MAX_PATH)
1287                 return WIMLIB_ERR_INVALID_PARAM;
1288
1289         if (GetFileAttributesW(root_disk_path) == INVALID_FILE_ATTRIBUTES &&
1290             GetLastError() == ERROR_FILE_NOT_FOUND)
1291         {
1292                 ERROR("Capture directory \"%ls\" does not exist!",
1293                       root_disk_path);
1294                 return WIMLIB_ERR_OPENDIR;
1295         }
1296
1297         ret = win32_get_file_and_vol_ids(root_disk_path,
1298                                          &params->capture_root_ino,
1299                                          &params->capture_root_dev);
1300         if (ret)
1301                 return ret;
1302
1303         win32_get_vol_flags(root_disk_path, &vol_flags, NULL);
1304
1305         /* WARNING: There is no check for overflow later when this buffer is
1306          * being used!  But it's as long as the maximum path length understood
1307          * by Windows NT (which is NOT the same as MAX_PATH). */
1308         path = MALLOC(WINDOWS_NT_MAX_PATH * sizeof(wchar_t));
1309         if (!path)
1310                 return WIMLIB_ERR_NOMEM;
1311
1312         /* Work around defective behavior in Windows where paths longer than 260
1313          * characters are not supported by default; instead they need to be
1314          * turned into absolute paths and prefixed with "\\?\".  */
1315
1316         if (wcsncmp(root_disk_path, L"\\\\?\\", 4)) {
1317                 dret = GetFullPathName(root_disk_path, WINDOWS_NT_MAX_PATH - 4,
1318                                        &path[4], NULL);
1319
1320                 if (dret == 0 || dret >= WINDOWS_NT_MAX_PATH - 4) {
1321                         WARNING("Can't get full path name for \"%ls\"", root_disk_path);
1322                         wmemcpy(path, root_disk_path, path_nchars + 1);
1323                 } else {
1324                         wmemcpy(path, L"\\\\?\\", 4);
1325                         path_nchars = 4 + dret;
1326                         /* Update pattern prefix */
1327                         if (params->config != NULL)
1328                         {
1329                                 params->config->_prefix = TSTRDUP(path);
1330                                 params->config->_prefix_num_tchars = path_nchars;
1331                                 if (params->config->_prefix == NULL)
1332                                 {
1333                                         ret = WIMLIB_ERR_NOMEM;
1334                                         goto out_free_path;
1335                                 }
1336                                 need_prefix_free = true;
1337                         }
1338                 }
1339         } else {
1340                 wmemcpy(path, root_disk_path, path_nchars + 1);
1341         }
1342
1343         memset(&state, 0, sizeof(state));
1344         ret = win32_build_dentry_tree_recursive(root_ret, path,
1345                                                 path_nchars, params,
1346                                                 &state, vol_flags);
1347         if (need_prefix_free)
1348                 FREE(params->config->_prefix);
1349 out_free_path:
1350         FREE(path);
1351         if (ret == 0)
1352                 win32_do_capture_warnings(root_disk_path, &state, params->add_flags);
1353         return ret;
1354 }
1355
1356 #endif /* __WIN32__ */