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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 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 #define MAX_GET_SD_ACCESS_DENIED_WARNINGS 1
  40 #define MAX_GET_SACL_PRIV_NOTHELD_WARNINGS 1
  41 #define MAX_CAPTURE_LONG_PATH_WARNINGS 5
  42
  43 struct win32_capture_state {
  44         unsigned long num_get_sd_access_denied;
  45         unsigned long num_get_sacl_priv_notheld;
  46         unsigned long num_long_path_warnings;
  47 };
  48
  49
  50 static const wchar_t *capture_access_denied_msg =
  51 L"         If you are not running this program as the administrator, you may\n"
  52  "         need to do so, so that all data and metadata can be backed up.\n"
  53  "         Otherwise, there may be no way to access the desired data or\n"
  54  "         metadata without taking ownership of the file or directory.\n"
  55  ;
  56
  57 int
  58 read_win32_file_prefix(const struct wim_lookup_table_entry *lte,
  59                        u64 size,
  60                        consume_data_callback_t cb,
  61                        void *cb_ctx)
  62 {
  63         int ret = 0;
  64         u64 bytes_remaining;
  65         u8 buf[BUFFER_SIZE];
  66
  67         HANDLE hFile = win32_open_existing_file(lte->file_on_disk,
  68                                                 FILE_READ_DATA);
  69         if (hFile == INVALID_HANDLE_VALUE) {
  70                 set_errno_from_GetLastError();
  71                 ERROR_WITH_ERRNO("Failed to open \"%ls\"", lte->file_on_disk);
  72                 return WIMLIB_ERR_OPEN;
  73         }
  74
  75         bytes_remaining = size;
  76         while (bytes_remaining) {
  77                 DWORD bytesToRead, bytesRead;
  78
  79                 bytesToRead = min(sizeof(buf), bytes_remaining);
  80                 if (!ReadFile(hFile, buf, bytesToRead, &bytesRead, NULL) ||
  81                     bytesRead != bytesToRead)
  82                 {
  83                         set_errno_from_GetLastError();
  84                         ERROR_WITH_ERRNO("Failed to read data from \"%ls\"",
  85                                          lte->file_on_disk);
  86                         ret = WIMLIB_ERR_READ;
  87                         break;
  88                 }
  89                 bytes_remaining -= bytesRead;
  90                 ret = (*cb)(buf, bytesRead, cb_ctx);
  91                 if (ret)
  92                         break;
  93         }
  94 out_close_handle:
  95         CloseHandle(hFile);
  96         return ret;
  97 }
  98
  99 struct win32_encrypted_read_ctx {
 100         consume_data_callback_t read_prefix_cb;
 101         void *read_prefix_ctx;
 102         int wimlib_err_code;
 103         u64 bytes_remaining;
 104 };
 105
 106 static DWORD WINAPI
 107 win32_encrypted_export_cb(unsigned char *data, void *_ctx, unsigned long len)
 108 {
 109         struct win32_encrypted_read_ctx *ctx = _ctx;
 110         int ret;
 111         size_t bytes_to_consume = min(len, ctx->bytes_remaining);
 112
 113         if (bytes_to_consume == 0)
 114                 return ERROR_SUCCESS;
 115
 116         ret = (*ctx->read_prefix_cb)(data, bytes_to_consume, ctx->read_prefix_ctx);
 117         if (ret) {
 118                 ctx->wimlib_err_code = ret;
 119                 /* Shouldn't matter what error code is returned here, as long as
 120                  * it isn't ERROR_SUCCESS.  */
 121                 return ERROR_READ_FAULT;
 122         }
 123         ctx->bytes_remaining -= bytes_to_consume;
 124         return ERROR_SUCCESS;
 125 }
 126
 127 int
 128 read_win32_encrypted_file_prefix(const struct wim_lookup_table_entry *lte,
 129                                  u64 size,
 130                                  consume_data_callback_t cb,
 131                                  void *cb_ctx)
 132 {
 133         struct win32_encrypted_read_ctx export_ctx;
 134         DWORD err;
 135         void *file_ctx;
 136         int ret;
 137
 138         DEBUG("Reading %"PRIu64" bytes from encryted file \"%ls\"",
 139               size, lte->file_on_disk);
 140
 141         export_ctx.read_prefix_cb = cb;
 142         export_ctx.read_prefix_ctx = cb_ctx;
 143         export_ctx.wimlib_err_code = 0;
 144         export_ctx.bytes_remaining = size;
 145
 146         err = OpenEncryptedFileRaw(lte->file_on_disk, 0, &file_ctx);
 147         if (err != ERROR_SUCCESS) {
 148                 set_errno_from_win32_error(err);
 149                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 150                                  "for raw read", lte->file_on_disk);
 151                 return WIMLIB_ERR_OPEN;
 152         }
 153         err = ReadEncryptedFileRaw(win32_encrypted_export_cb,
 154                                    &export_ctx, file_ctx);
 155         if (err != ERROR_SUCCESS) {
 156                 set_errno_from_win32_error(err);
 157                 ERROR_WITH_ERRNO("Failed to read encrypted file \"%ls\"",
 158                                  lte->file_on_disk);
 159                 ret = export_ctx.wimlib_err_code;
 160                 if (ret == 0)
 161                         ret = WIMLIB_ERR_READ;
 162         } else if (export_ctx.bytes_remaining != 0) {
 163                 ERROR("Only could read %"PRIu64" of %"PRIu64" bytes from "
 164                       "encryted file \"%ls\"",
 165                       size - export_ctx.bytes_remaining, size,
 166                       lte->file_on_disk);
 167                 ret = WIMLIB_ERR_READ;
 168         } else {
 169                 ret = 0;
 170         }
 171         CloseEncryptedFileRaw(file_ctx);
 172         return ret;
 173 }
 174
 175
 176 static u64
 177 FILETIME_to_u64(const FILETIME *ft)
 178 {
 179         return ((u64)ft->dwHighDateTime << 32) | (u64)ft->dwLowDateTime;
 180 }
 181
 182 /* Load the short name of a file into a WIM dentry.
 183  *
 184  * If we can't read the short filename for some reason, we just ignore the error
 185  * and assume the file has no short name.  This shouldn't be an issue, since the
 186  * short names are essentially obsolete anyway.
 187  */
 188 static int
 189 win32_get_short_name(HANDLE hFile, const wchar_t *path, struct wim_dentry *dentry)
 190 {
 191
 192         /* It's not any harder to just make the NtQueryInformationFile() system
 193          * call ourselves, and it saves a dumb call to FindFirstFile() which of
 194          * course has to create its own handle.  */
 195 #ifdef WITH_NTDLL
 196         if (func_NtQueryInformationFile) {
 197                 NTSTATUS status;
 198                 IO_STATUS_BLOCK io_status;
 199                 u8 buf[128] _aligned_attribute(8);
 200                 const FILE_NAME_INFORMATION *info;
 201
 202                 status = (*func_NtQueryInformationFile)(hFile, &io_status, buf, sizeof(buf),
 203                                                         FileAlternateNameInformation);
 204                 info = (const FILE_NAME_INFORMATION*)buf;
 205                 if (status == STATUS_SUCCESS && info->FileNameLength != 0) {
 206                         dentry->short_name = MALLOC(info->FileNameLength + 2);
 207                         if (!dentry->short_name)
 208                                 return WIMLIB_ERR_NOMEM;
 209                         memcpy(dentry->short_name, info->FileName,
 210                                info->FileNameLength);
 211                         dentry->short_name[info->FileNameLength / 2] = L'\0';
 212                         dentry->short_name_nbytes = info->FileNameLength;
 213                 }
 214                 return 0;
 215         }
 216 #endif
 217
 218         WIN32_FIND_DATAW dat;
 219         HANDLE hFind;
 220         int ret = 0;
 221
 222         hFind = FindFirstFile(path, &dat);
 223         if (hFind != INVALID_HANDLE_VALUE) {
 224                 if (dat.cAlternateFileName[0] != L'\0') {
 225                         DEBUG("\"%ls\": short name \"%ls\"", path, dat.cAlternateFileName);
 226                         size_t short_name_nbytes = wcslen(dat.cAlternateFileName) *
 227                                                    sizeof(wchar_t);
 228                         size_t n = short_name_nbytes + sizeof(wchar_t);
 229                         dentry->short_name = MALLOC(n);
 230                         if (dentry->short_name) {
 231                                 memcpy(dentry->short_name, dat.cAlternateFileName, n);
 232                                 dentry->short_name_nbytes = short_name_nbytes;
 233                         } else {
 234                                 ret = WIMLIB_ERR_NOMEM;
 235                         }
 236                 }
 237                 FindClose(hFind);
 238         }
 239         return ret;
 240 }
 241
 242 /*
 243  * win32_query_security_descriptor() - Query a file's security descriptor
 244  *
 245  * We need the file's security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 246  * format, and we currently have a handle opened with as many relevant
 247  * permissions as possible.  At this point, on Windows there are a number of
 248  * options for reading a file's security descriptor:
 249  *
 250  * GetFileSecurity():  This takes in a path and returns the
 251  * SECURITY_DESCRIPTOR_RELATIVE.  Problem: this uses an internal handle, not
 252  * ours, and the handle created internally doesn't specify
 253  * FILE_FLAG_BACKUP_SEMANTICS.  Therefore there can be access denied errors on
 254  * some files and directories, even when running as the Administrator.
 255  *
 256  * GetSecurityInfo():  This takes in a handle and returns the security
 257  * descriptor split into a bunch of different parts.  This should work, but it's
 258  * dumb because we have to put the security descriptor back together again.
 259  *
 260  * BackupRead():  This can read the security descriptor, but this is a
 261  * difficult-to-use API, probably only works as the Administrator, and the
 262  * format of the returned data is not well documented.
 263  *
 264  * NtQuerySecurityObject():  This is exactly what we need, as it takes in a
 265  * handle and returns the security descriptor in SECURITY_DESCRIPTOR_RELATIVE
 266  * format.  Only problem is that it's a ntdll function and therefore not
 267  * officially part of the Win32 API.  Oh well.
 268  */
 269 static DWORD
 270 win32_query_security_descriptor(HANDLE hFile, const wchar_t *path,
 271                                 SECURITY_INFORMATION requestedInformation,
 272                                 SECURITY_DESCRIPTOR *buf,
 273                                 DWORD bufsize, DWORD *lengthNeeded)
 274 {
 275 #ifdef WITH_NTDLL
 276         if (func_NtQuerySecurityObject) {
 277                 NTSTATUS status;
 278
 279                 status = (*func_NtQuerySecurityObject)(hFile,
 280                                                        requestedInformation, buf,
 281                                                        bufsize, lengthNeeded);
 282                 /* Since it queries an already-open handle, NtQuerySecurityObject()
 283                  * apparently returns STATUS_ACCESS_DENIED rather than
 284                  * STATUS_PRIVILEGE_NOT_HELD.  */
 285                 if (status == STATUS_ACCESS_DENIED)
 286                         return ERROR_PRIVILEGE_NOT_HELD;
 287                 else
 288                         return (*func_RtlNtStatusToDosError)(status);
 289         }
 290 #endif
 291         if (GetFileSecurity(path, requestedInformation, buf,
 292                             bufsize, lengthNeeded))
 293                 return ERROR_SUCCESS;
 294         else
 295                 return GetLastError();
 296 }
 297
 298 static int
 299 win32_get_security_descriptor(HANDLE hFile,
 300                               const wchar_t *path,
 301                               struct wim_inode *inode,
 302                               struct wim_sd_set *sd_set,
 303                               struct win32_capture_state *state,
 304                               int add_flags)
 305 {
 306         SECURITY_INFORMATION requestedInformation;
 307         u8 _buf[4096];
 308         u8 *buf;
 309         size_t bufsize;
 310         DWORD lenNeeded;
 311         DWORD err;
 312         int ret;
 313
 314         requestedInformation = DACL_SECURITY_INFORMATION |
 315                                SACL_SECURITY_INFORMATION |
 316                                OWNER_SECURITY_INFORMATION |
 317                                GROUP_SECURITY_INFORMATION;
 318         buf = _buf;
 319         bufsize = sizeof(_buf);
 320         for (;;) {
 321                 err = win32_query_security_descriptor(hFile, path,
 322                                                       requestedInformation,
 323                                                       (SECURITY_DESCRIPTOR*)buf,
 324                                                       bufsize, &lenNeeded);
 325                 switch (err) {
 326                 case ERROR_SUCCESS:
 327                         goto have_descriptor;
 328                 case ERROR_INSUFFICIENT_BUFFER:
 329                         wimlib_assert(buf == _buf);
 330                         buf = MALLOC(lenNeeded);
 331                         if (!buf)
 332                                 return WIMLIB_ERR_NOMEM;
 333                         bufsize = lenNeeded;
 334                         break;
 335                 case ERROR_PRIVILEGE_NOT_HELD:
 336                         if (add_flags & WIMLIB_ADD_FLAG_STRICT_ACLS)
 337                                 goto fail;
 338                         if (requestedInformation & SACL_SECURITY_INFORMATION) {
 339                                 state->num_get_sacl_priv_notheld++;
 340                                 requestedInformation &= ~SACL_SECURITY_INFORMATION;
 341                                 break;
 342                         }
 343                         /* Fall through */
 344                 case ERROR_ACCESS_DENIED:
 345                         if (add_flags & WIMLIB_ADD_FLAG_STRICT_ACLS)
 346                                 goto fail;
 347                         state->num_get_sd_access_denied++;
 348                         ret = 0;
 349                         goto out_free_buf;
 350                 default:
 351                 fail:
 352                         set_errno_from_win32_error(err);
 353                         ERROR_WITH_ERRNO("Failed to read security descriptor of \"%ls\"", path);
 354                         ret = WIMLIB_ERR_READ;
 355                         goto out_free_buf;
 356                 }
 357         }
 358
 359 have_descriptor:
 360         inode->i_security_id = sd_set_add_sd(sd_set, buf, lenNeeded);
 361         if (inode->i_security_id < 0)
 362                 ret = WIMLIB_ERR_NOMEM;
 363         else
 364                 ret = 0;
 365 out_free_buf:
 366         if (buf != _buf)
 367                 FREE(buf);
 368         return ret;
 369 }
 370
 371 static int
 372 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 373                                   wchar_t *path,
 374                                   size_t path_num_chars,
 375                                   struct add_image_params *params,
 376                                   struct win32_capture_state *state,
 377                                   unsigned vol_flags);
 378
 379 /* Reads the directory entries of directory and recursively calls
 380  * win32_build_dentry_tree() on them.  */
 381 static int
 382 win32_recurse_directory(HANDLE hDir,
 383                         wchar_t *dir_path,
 384                         size_t dir_path_num_chars,
 385                         struct wim_dentry *root,
 386                         struct add_image_params *params,
 387                         struct win32_capture_state *state,
 388                         unsigned vol_flags)
 389 {
 390         int ret;
 391
 392         DEBUG("Recurse to directory \"%ls\"", dir_path);
 393
 394         /* Using NtQueryDirectoryFile() we can re-use the same open handle,
 395          * which we opened with FILE_FLAG_BACKUP_SEMANTICS (probably not the
 396          * case for the FindFirstFile() API; it's not documented).  */
 397 #ifdef WITH_NTDLL
 398         if (!func_NtQueryDirectoryFile)
 399                 goto use_FindFirstFile;
 400
 401         NTSTATUS status;
 402         IO_STATUS_BLOCK io_status;
 403         const size_t bufsize = 8192;
 404         u8 *buf;
 405         BOOL restartScan = TRUE;
 406         const FILE_NAMES_INFORMATION *info;
 407
 408         buf = MALLOC(bufsize);
 409         if (!buf)
 410                 return WIMLIB_ERR_NOMEM;
 411         for (;;) {
 412                 status = (*func_NtQueryDirectoryFile)(hDir, NULL, NULL, NULL,
 413                                                       &io_status, buf, bufsize,
 414                                                       FileNamesInformation,
 415                                                       FALSE, NULL, restartScan);
 416                 restartScan = FALSE;
 417                 if (status != STATUS_SUCCESS) {
 418                         if (status == STATUS_NO_MORE_FILES ||
 419                             status == STATUS_NO_MORE_ENTRIES ||
 420                             status == STATUS_NO_MORE_MATCHES) {
 421                                 ret = 0;
 422                         } else if (status == STATUS_NOT_IMPLEMENTED ||
 423                                    status == STATUS_NOT_SUPPORTED ||
 424                                    status == STATUS_INVALID_INFO_CLASS) {
 425                                 FREE(buf);
 426                                 goto use_FindFirstFile;
 427                         } else {
 428                                 set_errno_from_nt_status(status);
 429                                 ERROR_WITH_ERRNO("Failed to read directory "
 430                                                  "\"%ls\"", dir_path);
 431                                 ret = WIMLIB_ERR_READ;
 432                         }
 433                         goto out_free_buf;
 434                 }
 435                 wimlib_assert(io_status.Information != 0);
 436                 info = (const FILE_NAMES_INFORMATION*)buf;
 437                 for (;;) {
 438                         if (!(info->FileNameLength == 2 && info->FileName[0] == L'.') &&
 439                             !(info->FileNameLength == 4 && info->FileName[0] == L'.' &&
 440                                                            info->FileName[1] == L'.'))
 441                         {
 442                                 wchar_t *p;
 443                                 struct wim_dentry *child;
 444
 445                                 p = dir_path + dir_path_num_chars;
 446                                 *p++ = L'\\';
 447                                 p = wmempcpy(p, info->FileName,
 448                                              info->FileNameLength / 2);
 449                                 *p = '\0';
 450
 451                                 ret = win32_build_dentry_tree_recursive(
 452                                                                 &child,
 453                                                                 dir_path,
 454                                                                 p - dir_path,
 455                                                                 params,
 456                                                                 state,
 457                                                                 vol_flags);
 458
 459                                 dir_path[dir_path_num_chars] = L'\0';
 460
 461                                 if (ret)
 462                                         goto out_free_buf;
 463                                 if (child)
 464                                         dentry_add_child(root, child);
 465                         }
 466                         if (info->NextEntryOffset == 0)
 467                                 break;
 468                         info = (const FILE_NAMES_INFORMATION*)
 469                                         ((const u8*)info + info->NextEntryOffset);
 470                 }
 471         }
 472 out_free_buf:
 473         FREE(buf);
 474         return ret;
 475 #endif
 476
 477 use_FindFirstFile:
 478         ;
 479         WIN32_FIND_DATAW dat;
 480         HANDLE hFind;
 481         DWORD err;
 482
 483         /* Begin reading the directory by calling FindFirstFileW.  Unlike UNIX
 484          * opendir(), FindFirstFileW has file globbing built into it.  But this
 485          * isn't what we actually want, so just add a dummy glob to get all
 486          * entries. */
 487         dir_path[dir_path_num_chars] = OS_PREFERRED_PATH_SEPARATOR;
 488         dir_path[dir_path_num_chars + 1] = L'*';
 489         dir_path[dir_path_num_chars + 2] = L'\0';
 490         hFind = FindFirstFile(dir_path, &dat);
 491         dir_path[dir_path_num_chars] = L'\0';
 492
 493         if (hFind == INVALID_HANDLE_VALUE) {
 494                 err = GetLastError();
 495                 if (err == ERROR_FILE_NOT_FOUND) {
 496                         return 0;
 497                 } else {
 498                         set_errno_from_win32_error(err);
 499                         ERROR_WITH_ERRNO("Failed to read directory \"%ls\"",
 500                                          dir_path);
 501                         return WIMLIB_ERR_READ;
 502                 }
 503         }
 504         ret = 0;
 505         do {
 506                 /* Skip . and .. entries */
 507                 if (dat.cFileName[0] == L'.' &&
 508                     (dat.cFileName[1] == L'\0' ||
 509                      (dat.cFileName[1] == L'.' &&
 510                       dat.cFileName[2] == L'\0')))
 511                         continue;
 512                 size_t filename_len = wcslen(dat.cFileName);
 513
 514                 dir_path[dir_path_num_chars] = OS_PREFERRED_PATH_SEPARATOR;
 515                 wmemcpy(dir_path + dir_path_num_chars + 1,
 516                         dat.cFileName,
 517                         filename_len + 1);
 518
 519                 struct wim_dentry *child;
 520                 size_t path_len = dir_path_num_chars + 1 + filename_len;
 521                 ret = win32_build_dentry_tree_recursive(&child,
 522                                                         dir_path,
 523                                                         path_len,
 524                                                         params,
 525                                                         state,
 526                                                         vol_flags);
 527                 dir_path[dir_path_num_chars] = L'\0';
 528                 if (ret)
 529                         goto out_find_close;
 530                 if (child)
 531                         dentry_add_child(root, child);
 532         } while (FindNextFile(hFind, &dat));
 533         err = GetLastError();
 534         if (err != ERROR_NO_MORE_FILES) {
 535                 set_errno_from_win32_error(err);
 536                 ERROR_WITH_ERRNO("Failed to read directory \"%ls\"", dir_path);
 537                 if (ret == 0)
 538                         ret = WIMLIB_ERR_READ;
 539         }
 540 out_find_close:
 541         FindClose(hFind);
 542         return ret;
 543 }
 544
 545 /* Reparse point fixup status code */
 546 enum rp_status {
 547         /* Reparse point corresponded to an absolute symbolic link or junction
 548          * point that pointed outside the directory tree being captured, and
 549          * therefore was excluded. */
 550         RP_EXCLUDED       = 0x0,
 551
 552         /* Reparse point was not fixed as it was either a relative symbolic
 553          * link, a mount point, or something else we could not understand. */
 554         RP_NOT_FIXED      = 0x1,
 555
 556         /* Reparse point corresponded to an absolute symbolic link or junction
 557          * point that pointed inside the directory tree being captured, where
 558          * the target was specified by a "full" \??\ prefixed path, and
 559          * therefore was fixed to be relative to the root of the directory tree
 560          * being captured. */
 561         RP_FIXED_FULLPATH = 0x2,
 562
 563         /* Same as RP_FIXED_FULLPATH, except the absolute link target did not
 564          * have the \??\ prefix.  It may have begun with a drive letter though.
 565          * */
 566         RP_FIXED_ABSPATH  = 0x4,
 567
 568         /* Either RP_FIXED_FULLPATH or RP_FIXED_ABSPATH. */
 569         RP_FIXED          = RP_FIXED_FULLPATH | RP_FIXED_ABSPATH,
 570 };
 571
 572 /* Given the "substitute name" target of a Windows reparse point, try doing a
 573  * fixup where we change it to be absolute relative to the root of the directory
 574  * tree being captured.
 575  *
 576  * Note that this is only executed when WIMLIB_ADD_FLAG_RPFIX has been
 577  * set.
 578  *
 579  * @capture_root_ino and @capture_root_dev indicate the inode number and device
 580  * of the root of the directory tree being captured.  They are meant to identify
 581  * this directory (as an alternative to its actual path, which could potentially
 582  * be reached via multiple destinations due to other symbolic links).  This may
 583  * not work properly on FAT, which doesn't seem to supply proper inode numbers
 584  * or file IDs.  However, FAT doesn't support reparse points so this function
 585  * wouldn't even be called anyway.
 586  */
 587 static enum rp_status
 588 win32_capture_maybe_rpfix_target(wchar_t *target, u16 *target_nbytes_p,
 589                                  u64 capture_root_ino, u64 capture_root_dev,
 590                                  u32 rptag)
 591 {
 592         u16 target_nchars = *target_nbytes_p / 2;
 593         size_t stripped_chars;
 594         wchar_t *orig_target;
 595         int ret;
 596
 597         ret = parse_substitute_name(target, *target_nbytes_p, rptag);
 598         if (ret < 0)
 599                 return RP_NOT_FIXED;
 600         stripped_chars = ret;
 601         if (stripped_chars)
 602                 stripped_chars -= 2;
 603         target[target_nchars] = L'\0';
 604         orig_target = target;
 605         target = capture_fixup_absolute_symlink(target + stripped_chars,
 606                                                 capture_root_ino, capture_root_dev);
 607         if (!target)
 608                 return RP_EXCLUDED;
 609         target_nchars = wcslen(target);
 610         wmemmove(orig_target + stripped_chars, target, target_nchars + 1);
 611         *target_nbytes_p = (target_nchars + stripped_chars) * sizeof(wchar_t);
 612         DEBUG("Fixed reparse point (new target: \"%ls\")", orig_target);
 613         if (stripped_chars)
 614                 return RP_FIXED_FULLPATH;
 615         else
 616                 return RP_FIXED_ABSPATH;
 617 }
 618
 619 /* Returns: `enum rp_status' value on success; negative WIMLIB_ERR_* value on
 620  * failure. */
 621 static int
 622 win32_capture_try_rpfix(u8 *rpbuf, u16 *rpbuflen_p,
 623                         u64 capture_root_ino, u64 capture_root_dev,
 624                         const wchar_t *path)
 625 {
 626         struct reparse_data rpdata;
 627         int ret;
 628         enum rp_status rp_status;
 629
 630         ret = parse_reparse_data(rpbuf, *rpbuflen_p, &rpdata);
 631         if (ret)
 632                 return -ret;
 633
 634         rp_status = win32_capture_maybe_rpfix_target(rpdata.substitute_name,
 635                                                      &rpdata.substitute_name_nbytes,
 636                                                      capture_root_ino,
 637                                                      capture_root_dev,
 638                                                      le32_to_cpu(*(le32*)rpbuf));
 639         if (rp_status & RP_FIXED) {
 640                 wimlib_assert(rpdata.substitute_name_nbytes % 2 == 0);
 641                 utf16lechar substitute_name_copy[rpdata.substitute_name_nbytes / 2];
 642                 wmemcpy(substitute_name_copy, rpdata.substitute_name,
 643                         rpdata.substitute_name_nbytes / 2);
 644                 rpdata.substitute_name = substitute_name_copy;
 645                 rpdata.print_name = substitute_name_copy;
 646                 rpdata.print_name_nbytes = rpdata.substitute_name_nbytes;
 647                 if (rp_status == RP_FIXED_FULLPATH) {
 648                         /* "full path", meaning \??\ prefixed.  We should not
 649                          * include this prefix in the print name, as it is
 650                          * apparently meant for the filesystem driver only. */
 651                         rpdata.print_name += 4;
 652                         rpdata.print_name_nbytes -= 8;
 653                 }
 654                 ret = make_reparse_buffer(&rpdata, rpbuf, rpbuflen_p);
 655                 if (ret == 0)
 656                         ret = rp_status;
 657                 else
 658                         ret = -ret;
 659         } else {
 660                 if (rp_status == RP_EXCLUDED) {
 661                         size_t print_name_nchars = rpdata.print_name_nbytes / 2;
 662                         wchar_t print_name0[print_name_nchars + 1];
 663                         print_name0[print_name_nchars] = L'\0';
 664                         wmemcpy(print_name0, rpdata.print_name, print_name_nchars);
 665                         WARNING("Ignoring %ls pointing out of capture directory:\n"
 666                                 "          \"%ls\" -> \"%ls\"\n"
 667                                 "          (Use --norpfix to capture all symbolic links "
 668                                 "and junction points as-is)",
 669                                 (rpdata.rptag == WIM_IO_REPARSE_TAG_SYMLINK) ?
 670                                         L"absolute symbolic link" : L"junction point",
 671                                 path, print_name0);
 672                 }
 673                 ret = rp_status;
 674         }
 675         return ret;
 676 }
 677
 678 /*
 679  * Loads the reparse point data from a reparse point into memory, optionally
 680  * fixing the targets of absolute symbolic links and junction points to be
 681  * relative to the root of capture.
 682  *
 683  * @hFile:  Open handle to the reparse point.
 684  * @path:   Path to the reparse point.  Used for error messages only.
 685  * @params: Additional parameters, including whether to do reparse point fixups
 686  *          or not.
 687  * @rpbuf:  Buffer of length at least REPARSE_POINT_MAX_SIZE bytes into which
 688  *          the reparse point buffer will be loaded.
 689  * @rpbuflen_ret:  On success, the length of the reparse point buffer in bytes
 690  *                 is written to this location.
 691  *
 692  * Returns:
 693  *      On success, returns an `enum rp_status' value that indicates if and/or
 694  *      how the reparse point fixup was done.
 695  *
 696  *      On failure, returns a negative value that is a negated WIMLIB_ERR_*
 697  *      code.
 698  */
 699 static int
 700 win32_get_reparse_data(HANDLE hFile, const wchar_t *path,
 701                        struct add_image_params *params,
 702                        u8 *rpbuf, u16 *rpbuflen_ret)
 703 {
 704         DWORD bytesReturned;
 705         u32 reparse_tag;
 706         int ret;
 707         u16 rpbuflen;
 708
 709         DEBUG("Loading reparse data from \"%ls\"", path);
 710         if (!DeviceIoControl(hFile, FSCTL_GET_REPARSE_POINT,
 711                              NULL, /* "Not used with this operation; set to NULL" */
 712                              0, /* "Not used with this operation; set to 0" */
 713                              rpbuf, /* "A pointer to a buffer that
 714                                                    receives the reparse point data */
 715                              REPARSE_POINT_MAX_SIZE, /* "The size of the output
 716                                                         buffer, in bytes */
 717                              &bytesReturned,
 718                              NULL))
 719         {
 720                 set_errno_from_GetLastError();
 721                 ERROR_WITH_ERRNO("Failed to get reparse data of \"%ls\"", path);
 722                 return -WIMLIB_ERR_READ;
 723         }
 724         if (bytesReturned < 8 || bytesReturned > REPARSE_POINT_MAX_SIZE) {
 725                 ERROR("Reparse data on \"%ls\" is invalid", path);
 726                 return -WIMLIB_ERR_INVALID_REPARSE_DATA;
 727         }
 728
 729         rpbuflen = bytesReturned;
 730         reparse_tag = le32_to_cpu(*(le32*)rpbuf);
 731         if (params->add_flags & WIMLIB_ADD_FLAG_RPFIX &&
 732             (reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
 733              reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT))
 734         {
 735                 /* Try doing reparse point fixup */
 736                 ret = win32_capture_try_rpfix(rpbuf,
 737                                               &rpbuflen,
 738                                               params->capture_root_ino,
 739                                               params->capture_root_dev,
 740                                               path);
 741         } else {
 742                 ret = RP_NOT_FIXED;
 743         }
 744         *rpbuflen_ret = rpbuflen;
 745         return ret;
 746 }
 747
 748 static DWORD WINAPI
 749 win32_tally_encrypted_size_cb(unsigned char *_data, void *_size_ret,
 750                               unsigned long len)
 751 {
 752         *(u64*)_size_ret += len;
 753         return ERROR_SUCCESS;
 754 }
 755
 756 static int
 757 win32_get_encrypted_file_size(const wchar_t *path, u64 *size_ret)
 758 {
 759         DWORD err;
 760         void *file_ctx;
 761         int ret;
 762
 763         err = OpenEncryptedFileRaw(path, 0, &file_ctx);
 764         if (err != ERROR_SUCCESS) {
 765                 set_errno_from_win32_error(err);
 766                 ERROR_WITH_ERRNO("Failed to open encrypted file \"%ls\" "
 767                                  "for raw read", path);
 768                 return WIMLIB_ERR_OPEN;
 769         }
 770         *size_ret = 0;
 771         err = ReadEncryptedFileRaw(win32_tally_encrypted_size_cb,
 772                                    size_ret, file_ctx);
 773         if (err != ERROR_SUCCESS) {
 774                 set_errno_from_win32_error(err);
 775                 ERROR_WITH_ERRNO("Failed to read raw encrypted data from "
 776                                  "\"%ls\"", path);
 777                 ret = WIMLIB_ERR_READ;
 778         } else {
 779                 ret = 0;
 780         }
 781         CloseEncryptedFileRaw(file_ctx);
 782         return ret;
 783 }
 784
 785 /* Scans an unnamed or named stream of a Win32 file (not a reparse point
 786  * stream); calculates its SHA1 message digest and either creates a `struct
 787  * wim_lookup_table_entry' in memory for it, or uses an existing 'struct
 788  * wim_lookup_table_entry' for an identical stream.
 789  *
 790  * @path:               Path to the file (UTF-16LE).
 791  *
 792  * @path_num_chars:     Number of 2-byte characters in @path.
 793  *
 794  * @inode:              WIM inode to save the stream into.
 795  *
 796  * @lookup_table:       Stream lookup table for the WIM.
 797  *
 798  * @dat:                A `WIN32_FIND_STREAM_DATA' structure that specifies the
 799  *                      stream name.
 800  *
 801  * Returns 0 on success; nonzero on failure.
 802  */
 803 static int
 804 win32_capture_stream(const wchar_t *path,
 805                      size_t path_num_chars,
 806                      struct wim_inode *inode,
 807                      struct wim_lookup_table *lookup_table,
 808                      WIN32_FIND_STREAM_DATA *dat)
 809 {
 810         struct wim_ads_entry *ads_entry;
 811         struct wim_lookup_table_entry *lte;
 812         int ret;
 813         wchar_t *stream_name, *colon;
 814         size_t stream_name_nchars;
 815         bool is_named_stream;
 816         wchar_t *spath;
 817         size_t spath_nchars;
 818         size_t spath_buf_nbytes;
 819         const wchar_t *relpath_prefix;
 820         const wchar_t *colonchar;
 821
 822         DEBUG("Capture \"%ls\" stream \"%ls\"", path, dat->cStreamName);
 823
 824         /* The stream name should be returned as :NAME:TYPE */
 825         stream_name = dat->cStreamName;
 826         if (*stream_name != L':')
 827                 goto out_invalid_stream_name;
 828         stream_name += 1;
 829         colon = wcschr(stream_name, L':');
 830         if (colon == NULL)
 831                 goto out_invalid_stream_name;
 832
 833         if (wcscmp(colon + 1, L"$DATA")) {
 834                 /* Not a DATA stream */
 835                 ret = 0;
 836                 goto out;
 837         }
 838
 839         *colon = '\0';
 840
 841         stream_name_nchars = colon - stream_name;
 842         is_named_stream = (stream_name_nchars != 0);
 843
 844         if (is_named_stream) {
 845                 /* Allocate an ADS entry for the named stream. */
 846                 ads_entry = inode_add_ads_utf16le(inode, stream_name,
 847                                                   stream_name_nchars * sizeof(wchar_t));
 848                 if (!ads_entry) {
 849                         ret = WIMLIB_ERR_NOMEM;
 850                         goto out;
 851                 }
 852         }
 853
 854         /* If zero length stream, no lookup table entry needed. */
 855         if ((u64)dat->StreamSize.QuadPart == 0) {
 856                 ret = 0;
 857                 goto out;
 858         }
 859
 860         /* Create a UTF-16LE string @spath that gives the filename, then a
 861          * colon, then the stream name.  Or, if it's an unnamed stream, just the
 862          * filename.  It is MALLOC()'ed so that it can be saved in the
 863          * wim_lookup_table_entry if needed.
 864          *
 865          * As yet another special case, relative paths need to be changed to
 866          * begin with an explicit "./" so that, for example, a file t:ads, where
 867          * :ads is the part we added, is not interpreted as a file on the t:
 868          * drive. */
 869         spath_nchars = path_num_chars;
 870         relpath_prefix = L"";
 871         colonchar = L"";
 872         if (is_named_stream) {
 873                 spath_nchars += 1 + stream_name_nchars;
 874                 colonchar = L":";
 875                 if (path_num_chars == 1 && !is_any_path_separator(path[0])) {
 876                         spath_nchars += 2;
 877                         static const wchar_t _relpath_prefix[] =
 878                                 {L'.', OS_PREFERRED_PATH_SEPARATOR, L'\0'};
 879                         relpath_prefix = _relpath_prefix;
 880                 }
 881         }
 882
 883         spath_buf_nbytes = (spath_nchars + 1) * sizeof(wchar_t);
 884         spath = MALLOC(spath_buf_nbytes);
 885
 886         tsprintf(spath, L"%ls%ls%ls%ls",
 887                  relpath_prefix, path, colonchar, stream_name);
 888
 889         /* Make a new wim_lookup_table_entry */
 890         lte = new_lookup_table_entry();
 891         if (!lte) {
 892                 ret = WIMLIB_ERR_NOMEM;
 893                 goto out_free_spath;
 894         }
 895         lte->file_on_disk = spath;
 896         spath = NULL;
 897         if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED && !is_named_stream) {
 898                 u64 encrypted_size;
 899                 lte->resource_location = RESOURCE_WIN32_ENCRYPTED;
 900                 ret = win32_get_encrypted_file_size(path, &encrypted_size);
 901                 if (ret)
 902                         goto out_free_spath;
 903                 lte->size = encrypted_size;
 904         } else {
 905                 lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 906                 lte->size = (u64)dat->StreamSize.QuadPart;
 907         }
 908
 909         u32 stream_id;
 910         if (is_named_stream) {
 911                 stream_id = ads_entry->stream_id;
 912                 ads_entry->lte = lte;
 913         } else {
 914                 stream_id = 0;
 915                 inode->i_lte = lte;
 916         }
 917         lookup_table_insert_unhashed(lookup_table, lte, inode, stream_id);
 918         ret = 0;
 919 out_free_spath:
 920         FREE(spath);
 921 out:
 922         return ret;
 923 out_invalid_stream_name:
 924         ERROR("Invalid stream name: \"%ls:%ls\"", path, dat->cStreamName);
 925         ret = WIMLIB_ERR_READ;
 926         goto out;
 927 }
 928
 929 /* Load information about the streams of an open file into a WIM inode.
 930  *
 931  * By default, we use the NtQueryInformationFile() system call instead of
 932  * FindFirstStream() and FindNextStream().  This is done for two reasons:
 933  *
 934  * - FindFirstStream() opens its own handle to the file or directory and
 935  *   apparently does so without specifying FILE_FLAG_BACKUP_SEMANTICS, thereby
 936  *   causing access denied errors on certain files (even when running as the
 937  *   Administrator).
 938  * - FindFirstStream() and FindNextStream() is only available on Windows Vista
 939  *   and later, whereas the stream support in NtQueryInformationFile() was
 940  *   already present in Windows XP.
 941  */
 942 static int
 943 win32_capture_streams(HANDLE *hFile_p,
 944                       const wchar_t *path,
 945                       size_t path_num_chars,
 946                       struct wim_inode *inode,
 947                       struct wim_lookup_table *lookup_table,
 948                       u64 file_size,
 949                       unsigned vol_flags)
 950 {
 951         WIN32_FIND_STREAM_DATA dat;
 952         int ret;
 953 #ifdef WITH_NTDLL
 954         u8 _buf[8192] _aligned_attribute(8);
 955         u8 *buf;
 956         size_t bufsize;
 957         IO_STATUS_BLOCK io_status;
 958         NTSTATUS status;
 959         const FILE_STREAM_INFORMATION *info;
 960 #endif
 961         HANDLE hFind;
 962         DWORD err;
 963
 964         DEBUG("Capturing streams from \"%ls\"", path);
 965
 966         if (!(vol_flags & FILE_NAMED_STREAMS))
 967                 goto unnamed_only;
 968
 969 #ifdef WITH_NTDLL
 970         if (!func_NtQueryInformationFile)
 971                 goto use_FindFirstStream;
 972
 973         buf = _buf;
 974         bufsize = sizeof(_buf);
 975
 976         /* Get a buffer containing the stream information.  */
 977         for (;;) {
 978                 status = (*func_NtQueryInformationFile)(*hFile_p, &io_status,
 979                                                         buf, bufsize,
 980                                                         FileStreamInformation);
 981                 if (status == STATUS_SUCCESS) {
 982                         break;
 983                 } else if (status == STATUS_BUFFER_OVERFLOW) {
 984                         u8 *newbuf;
 985
 986                         bufsize *= 2;
 987                         if (buf == _buf)
 988                                 newbuf = MALLOC(bufsize);
 989                         else
 990                                 newbuf = REALLOC(buf, bufsize);
 991
 992                         if (!newbuf) {
 993                                 ret = WIMLIB_ERR_NOMEM;
 994                                 goto out_free_buf;
 995                         }
 996                         buf = newbuf;
 997                 } else if (status == STATUS_NOT_IMPLEMENTED ||
 998                            status == STATUS_NOT_SUPPORTED ||
 999                            status == STATUS_INVALID_INFO_CLASS) {
1000                         goto use_FindFirstStream;
1001                 } else {
1002                         set_errno_from_nt_status(status);
1003                         ERROR_WITH_ERRNO("Failed to read streams of %ls", path);
1004                         ret = WIMLIB_ERR_READ;
1005                         goto out_free_buf;
1006                 }
1007         }
1008
1009         if (io_status.Information == 0) {
1010                 /* No stream information.  */
1011                 ret = 0;
1012                 goto out_free_buf;
1013         }
1014
1015         if (inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED) {
1016                 /* OpenEncryptedFileRaw() seems to fail with
1017                  * ERROR_SHARING_VIOLATION if there are any handles opened to
1018                  * the file.  */
1019                 CloseHandle(*hFile_p);
1020                 *hFile_p = INVALID_HANDLE_VALUE;
1021         }
1022
1023         /* Parse one or more stream information structures.  */
1024         info = (const FILE_STREAM_INFORMATION*)buf;
1025         for (;;) {
1026                 if (info->StreamNameLength <= sizeof(dat.cStreamName) - 2) {
1027                         dat.StreamSize = info->StreamSize;
1028                         memcpy(dat.cStreamName, info->StreamName, info->StreamNameLength);
1029                         dat.cStreamName[info->StreamNameLength / 2] = L'\0';
1030
1031                         /* Capture the stream.  */
1032                         ret = win32_capture_stream(path, path_num_chars, inode,
1033                                                    lookup_table, &dat);
1034                         if (ret)
1035                                 goto out_free_buf;
1036                 }
1037                 if (info->NextEntryOffset == 0) {
1038                         /* No more stream information.  */
1039                         ret = 0;
1040                         break;
1041                 }
1042                 /* Advance to next stream information.  */
1043                 info = (const FILE_STREAM_INFORMATION*)
1044                                 ((const u8*)info + info->NextEntryOffset);
1045         }
1046 out_free_buf:
1047         /* Free buffer if allocated on heap.  */
1048         if (buf != _buf)
1049                 FREE(buf);
1050         return ret;
1051 #endif /* WITH_NTDLL */
1052
1053 use_FindFirstStream:
1054         if (win32func_FindFirstStreamW == NULL)
1055                 goto unnamed_only;
1056         hFind = win32func_FindFirstStreamW(path, FindStreamInfoStandard, &dat, 0);
1057         if (hFind == INVALID_HANDLE_VALUE) {
1058                 err = GetLastError();
1059                 if (err == ERROR_CALL_NOT_IMPLEMENTED ||
1060                     err == ERROR_NOT_SUPPORTED ||
1061                     err == ERROR_INVALID_FUNCTION ||
1062                     err == ERROR_INVALID_PARAMETER)
1063                         goto unnamed_only;
1064
1065                 /* Seems legal for this to return ERROR_HANDLE_EOF on reparse
1066                  * points and directories */
1067                 if ((inode->i_attributes &
1068                     (FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_DIRECTORY))
1069                     && err == ERROR_HANDLE_EOF)
1070                 {
1071                         DEBUG("ERROR_HANDLE_EOF (ok)");
1072                         return 0;
1073                 } else {
1074                         if (err == ERROR_ACCESS_DENIED) {
1075                                 WARNING("Failed to look up data streams "
1076                                         "of \"%ls\": Access denied!\n%ls",
1077                                         path, capture_access_denied_msg);
1078                                 return 0;
1079                         } else {
1080                                 set_errno_from_win32_error(err);
1081                                 ERROR_WITH_ERRNO("Failed to look up data streams "
1082                                                  "of \"%ls\"", path);
1083                                 return WIMLIB_ERR_READ;
1084                         }
1085                 }
1086         }
1087         do {
1088                 ret = win32_capture_stream(path,
1089                                            path_num_chars,
1090                                            inode, lookup_table,
1091                                            &dat);
1092                 if (ret)
1093                         goto out_find_close;
1094         } while (win32func_FindNextStreamW(hFind, &dat));
1095         err = GetLastError();
1096         if (err != ERROR_HANDLE_EOF) {
1097                 set_errno_from_win32_error(err);
1098                 ERROR_WITH_ERRNO("Error reading data streams from "
1099                                  "\"%ls\"", path);
1100                 ret = WIMLIB_ERR_READ;
1101         }
1102 out_find_close:
1103         FindClose(hFind);
1104         return ret;
1105
1106 unnamed_only:
1107         /* FindFirstStream() API is not available, or the volume does not
1108          * support named streams.  Only capture the unnamed data stream. */
1109         DEBUG("Only capturing unnamed data stream");
1110         if (inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY |
1111                                    FILE_ATTRIBUTE_REPARSE_POINT))
1112                 return 0;
1113
1114         wcscpy(dat.cStreamName, L"::$DATA");
1115         dat.StreamSize.QuadPart = file_size;
1116         return win32_capture_stream(path, path_num_chars,
1117                                     inode, lookup_table, &dat);
1118 }
1119
1120 static int
1121 win32_build_dentry_tree_recursive(struct wim_dentry **root_ret,
1122                                   wchar_t *path,
1123                                   size_t path_num_chars,
1124                                   struct add_image_params *params,
1125                                   struct win32_capture_state *state,
1126                                   unsigned vol_flags)
1127 {
1128         struct wim_dentry *root = NULL;
1129         struct wim_inode *inode = NULL;
1130         DWORD err;
1131         u64 file_size;
1132         int ret;
1133         u8 *rpbuf;
1134         u16 rpbuflen;
1135         u16 not_rpfixed;
1136         HANDLE hFile = INVALID_HANDLE_VALUE;
1137         DWORD desiredAccess;
1138
1139
1140         if (exclude_path(path, path_num_chars, params->config, true)) {
1141                 if (params->add_flags & WIMLIB_ADD_FLAG_ROOT) {
1142                         ERROR("Cannot exclude the root directory from capture");
1143                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
1144                         goto out;
1145                 }
1146                 ret = 0;
1147                 goto out_progress;
1148         }
1149
1150 #if 0
1151         if (path_num_chars >= 4 &&
1152             !wmemcmp(path, L"\\\\?\\", 4) &&
1153             path_num_chars + 1 - 4 > MAX_PATH &&
1154             state->num_long_path_warnings < MAX_CAPTURE_LONG_PATH_WARNINGS)
1155         {
1156                 WARNING("Path \"%ls\" exceeds MAX_PATH", path);
1157                 if (++state->num_long_path_warnings == MAX_CAPTURE_LONG_PATH_WARNINGS)
1158                         WARNING("Suppressing further warnings about long paths.");
1159         }
1160 #endif
1161
1162         desiredAccess = FILE_READ_DATA | FILE_READ_ATTRIBUTES |
1163                         READ_CONTROL | ACCESS_SYSTEM_SECURITY;
1164 again:
1165         hFile = win32_open_existing_file(path, desiredAccess);
1166         if (hFile == INVALID_HANDLE_VALUE) {
1167                 err = GetLastError();
1168                 if (err == ERROR_ACCESS_DENIED || err == ERROR_PRIVILEGE_NOT_HELD) {
1169                         if (desiredAccess & ACCESS_SYSTEM_SECURITY) {
1170                                 desiredAccess &= ~ACCESS_SYSTEM_SECURITY;
1171                                 goto again;
1172                         }
1173                         if (desiredAccess & READ_CONTROL) {
1174                                 desiredAccess &= ~READ_CONTROL;
1175                                 goto again;
1176                         }
1177                 }
1178                 set_errno_from_GetLastError();
1179                 ERROR_WITH_ERRNO("Failed to open \"%ls\" for reading", path);
1180                 ret = WIMLIB_ERR_OPEN;
1181                 goto out;
1182         }
1183
1184         BY_HANDLE_FILE_INFORMATION file_info;
1185         if (!GetFileInformationByHandle(hFile, &file_info)) {
1186                 set_errno_from_GetLastError();
1187                 ERROR_WITH_ERRNO("Failed to get file information for \"%ls\"",
1188                                  path);
1189                 ret = WIMLIB_ERR_STAT;
1190                 goto out;
1191         }
1192
1193         if (file_info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1194                 rpbuf = alloca(REPARSE_POINT_MAX_SIZE);
1195                 ret = win32_get_reparse_data(hFile, path, params,
1196                                              rpbuf, &rpbuflen);
1197                 if (ret < 0) {
1198                         /* WIMLIB_ERR_* (inverted) */
1199                         ret = -ret;
1200                         goto out;
1201                 } else if (ret & RP_FIXED) {
1202                         not_rpfixed = 0;
1203                 } else if (ret == RP_EXCLUDED) {
1204                         ret = 0;
1205                         goto out_progress;
1206                 } else {
1207                         not_rpfixed = 1;
1208                 }
1209         }
1210
1211         /* Create a WIM dentry with an associated inode, which may be shared.
1212          *
1213          * However, we need to explicitly check for directories and files with
1214          * only 1 link and refuse to hard link them.  This is because Windows
1215          * has a bug where it can return duplicate File IDs for files and
1216          * directories on the FAT filesystem. */
1217         ret = inode_table_new_dentry(&params->inode_table,
1218                                      path_basename_with_len(path, path_num_chars),
1219                                      ((u64)file_info.nFileIndexHigh << 32) |
1220                                          (u64)file_info.nFileIndexLow,
1221                                      file_info.dwVolumeSerialNumber,
1222                                      (file_info.nNumberOfLinks <= 1 ||
1223                                         (file_info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)),
1224                                      &root);
1225         if (ret)
1226                 goto out;
1227
1228         ret = win32_get_short_name(hFile, path, root);
1229         if (ret)
1230                 goto out;
1231
1232         inode = root->d_inode;
1233
1234         if (inode->i_nlink > 1) {
1235                 /* Shared inode; nothing more to do */
1236                 goto out_progress;
1237         }
1238
1239         inode->i_attributes = file_info.dwFileAttributes;
1240         inode->i_creation_time = FILETIME_to_u64(&file_info.ftCreationTime);
1241         inode->i_last_write_time = FILETIME_to_u64(&file_info.ftLastWriteTime);
1242         inode->i_last_access_time = FILETIME_to_u64(&file_info.ftLastAccessTime);
1243         inode->i_resolved = 1;
1244
1245         params->add_flags &= ~WIMLIB_ADD_FLAG_ROOT;
1246
1247         if (!(params->add_flags & WIMLIB_ADD_FLAG_NO_ACLS)
1248             && (vol_flags & FILE_PERSISTENT_ACLS))
1249         {
1250                 ret = win32_get_security_descriptor(hFile, path, inode,
1251                                                     &params->sd_set, state,
1252                                                     params->add_flags);
1253                 if (ret)
1254                         goto out;
1255         }
1256
1257         file_size = ((u64)file_info.nFileSizeHigh << 32) |
1258                      (u64)file_info.nFileSizeLow;
1259
1260
1261         /* Capture the unnamed data stream (only should be present for regular
1262          * files) and any alternate data streams. */
1263         ret = win32_capture_streams(&hFile,
1264                                     path,
1265                                     path_num_chars,
1266                                     inode,
1267                                     params->lookup_table,
1268                                     file_size,
1269                                     vol_flags);
1270         if (ret)
1271                 goto out;
1272
1273         if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1274                 /* Reparse point: set the reparse data (which we read already)
1275                  * */
1276                 inode->i_not_rpfixed = not_rpfixed;
1277                 inode->i_reparse_tag = le32_to_cpu(*(le32*)rpbuf);
1278                 ret = inode_set_unnamed_stream(inode, rpbuf + 8, rpbuflen - 8,
1279                                                params->lookup_table);
1280         } else if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
1281                 /* Directory (not a reparse point) --- recurse to children */
1282
1283                 if (hFile == INVALID_HANDLE_VALUE) {
1284                         /* Re-open handle that was closed to read raw encrypted
1285                          * data.  */
1286                         hFile = win32_open_existing_file(path, FILE_READ_DATA);
1287                         if (hFile == INVALID_HANDLE_VALUE) {
1288                                 set_errno_from_GetLastError();
1289                                 ERROR_WITH_ERRNO("Failed to reopen \"%ls\"",
1290                                                  path);
1291                                 ret = WIMLIB_ERR_OPEN;
1292                                 goto out;
1293                         }
1294                 }
1295                 ret = win32_recurse_directory(hFile,
1296                                               path,
1297                                               path_num_chars,
1298                                               root,
1299                                               params,
1300                                               state,
1301                                               vol_flags);
1302         }
1303         if (ret)
1304                 goto out;
1305
1306         path[path_num_chars] = '\0';
1307 out_progress:
1308         params->progress.scan.cur_path = path;
1309         if (root == NULL)
1310                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_EXCLUDED, NULL);
1311         else
1312                 do_capture_progress(params, WIMLIB_SCAN_DENTRY_OK, inode);
1313 out:
1314         if (hFile != INVALID_HANDLE_VALUE)
1315                 CloseHandle(hFile);
1316         if (ret == 0)
1317                 *root_ret = root;
1318         else
1319                 free_dentry_tree(root, params->lookup_table);
1320         return ret;
1321 }
1322
1323 static void
1324 win32_do_capture_warnings(const wchar_t *path,
1325                           const struct win32_capture_state *state,
1326                           int add_flags)
1327 {
1328         if (state->num_get_sacl_priv_notheld == 0 &&
1329             state->num_get_sd_access_denied == 0)
1330                 return;
1331
1332         WARNING("Scan of \"%ls\" complete, but with one or more warnings:", path);
1333         if (state->num_get_sacl_priv_notheld != 0) {
1334                 WARNING("- Could not capture SACL (System Access Control List)\n"
1335                         "            on %lu files or directories.",
1336                         state->num_get_sacl_priv_notheld);
1337         }
1338         if (state->num_get_sd_access_denied != 0) {
1339                 WARNING("- Could not capture security descriptor at all\n"
1340                         "            on %lu files or directories.",
1341                         state->num_get_sd_access_denied);
1342         }
1343         WARNING("To fully capture all security descriptors, run the program\n"
1344                 "          with Administrator rights.");
1345 }
1346
1347 #define WINDOWS_NT_MAX_PATH 32768
1348
1349 /* Win32 version of capturing a directory tree */
1350 int
1351 win32_build_dentry_tree(struct wim_dentry **root_ret,
1352                         const wchar_t *root_disk_path,
1353                         struct add_image_params *params)
1354 {
1355         size_t path_nchars;
1356         wchar_t *path;
1357         int ret;
1358         struct win32_capture_state state;
1359         unsigned vol_flags;
1360         DWORD dret;
1361         bool need_prefix_free = false;
1362
1363         if (!win32func_FindFirstStreamW
1364 #ifdef WITH_NTDLL
1365             && !func_NtQueryInformationFile
1366 #endif
1367            )
1368         {
1369                 WARNING("Running on Windows XP or earlier; "
1370                         "alternate data streams will not be captured.");
1371         }
1372
1373         path_nchars = wcslen(root_disk_path);
1374         if (path_nchars > WINDOWS_NT_MAX_PATH)
1375                 return WIMLIB_ERR_INVALID_PARAM;
1376
1377         ret = win32_get_file_and_vol_ids(root_disk_path,
1378                                          &params->capture_root_ino,
1379                                          &params->capture_root_dev);
1380         if (ret) {
1381                 ERROR_WITH_ERRNO("Can't open %ls", root_disk_path);
1382                 return ret;
1383         }
1384
1385         win32_get_vol_flags(root_disk_path, &vol_flags, NULL);
1386
1387         /* WARNING: There is no check for overflow later when this buffer is
1388          * being used!  But it's as long as the maximum path length understood
1389          * by Windows NT (which is NOT the same as MAX_PATH). */
1390         path = MALLOC(WINDOWS_NT_MAX_PATH * sizeof(wchar_t));
1391         if (!path)
1392                 return WIMLIB_ERR_NOMEM;
1393
1394         /* Work around defective behavior in Windows where paths longer than 260
1395          * characters are not supported by default; instead they need to be
1396          * turned into absolute paths and prefixed with "\\?\".  */
1397
1398         if (wcsncmp(root_disk_path, L"\\\\?\\", 4)) {
1399                 dret = GetFullPathName(root_disk_path, WINDOWS_NT_MAX_PATH - 4,
1400                                        &path[4], NULL);
1401
1402                 if (dret == 0 || dret >= WINDOWS_NT_MAX_PATH - 4) {
1403                         WARNING("Can't get full path name for \"%ls\"", root_disk_path);
1404                         wmemcpy(path, root_disk_path, path_nchars + 1);
1405                 } else {
1406                         wmemcpy(path, L"\\\\?\\", 4);
1407                         path_nchars = 4 + dret;
1408                         /* Update pattern prefix */
1409                         if (params->config != NULL)
1410                         {
1411                                 params->config->_prefix = TSTRDUP(path);
1412                                 params->config->_prefix_num_tchars = path_nchars;
1413                                 if (params->config->_prefix == NULL)
1414                                 {
1415                                         ret = WIMLIB_ERR_NOMEM;
1416                                         goto out_free_path;
1417                                 }
1418                                 need_prefix_free = true;
1419                         }
1420                 }
1421         } else {
1422                 wmemcpy(path, root_disk_path, path_nchars + 1);
1423         }
1424
1425         memset(&state, 0, sizeof(state));
1426         ret = win32_build_dentry_tree_recursive(root_ret, path,
1427                                                 path_nchars, params,
1428                                                 &state, vol_flags);
1429         if (need_prefix_free)
1430                 FREE(params->config->_prefix);
1431 out_free_path:
1432         FREE(path);
1433         if (ret == 0)
1434                 win32_do_capture_warnings(root_disk_path, &state, params->add_flags);
1435         return ret;
1436 }
1437
1438 #endif /* __WIN32__ */