2 * win32_apply.c - Windows-specific code for applying files from a WIM image.
6 * Copyright (C) 2013, 2014 Eric Biggers
8 * This file is part of wimlib, a library for working with WIM files.
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)
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
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/.
30 #include "wimlib/win32_common.h"
32 #include "wimlib/apply.h"
33 #include "wimlib/capture.h" /* for mangle_pat() and match_pattern_list() */
34 #include "wimlib/dentry.h"
35 #include "wimlib/error.h"
36 #include "wimlib/lookup_table.h"
37 #include "wimlib/metadata.h"
38 #include "wimlib/reparse.h"
39 #include "wimlib/textfile.h"
40 #include "wimlib/xml.h"
41 #include "wimlib/wimboot.h"
43 struct win32_apply_ctx {
45 /* Extract flags, the pointer to the WIMStruct, etc. */
46 struct apply_ctx common;
48 /* WIMBoot information, only filled in if WIMLIB_EXTRACT_FLAG_WIMBOOT
52 struct string_set *prepopulate_pats;
53 void *mem_prepopulate_pats;
54 u8 wim_lookup_table_hash[SHA1_HASH_SIZE];
58 /* Open handle to the target directory */
61 /* NT namespace path to the target directory (buffer allocated) */
62 UNICODE_STRING target_ntpath;
64 /* Temporary buffer for building paths (buffer allocated) */
65 UNICODE_STRING pathbuf;
67 /* Object attributes to reuse for opening files in the target directory.
68 * (attr.ObjectName == &pathbuf) and (attr.RootDirectory == h_target).
70 OBJECT_ATTRIBUTES attr;
72 /* Temporary I/O status block for system calls */
75 /* Allocated buffer for creating "printable" paths from our
76 * target-relative NT paths */
77 wchar_t *print_buffer;
79 /* Allocated buffer for reading stream data when it cannot be extracted
83 /* Pointer to the next byte in @data_buffer to fill */
86 /* Size allocated in @data_buffer */
87 size_t data_buffer_size;
89 /* Current offset in the raw encrypted file being written */
90 size_t encrypted_offset;
92 /* Current size of the raw encrypted file being written */
93 size_t encrypted_size;
95 /* Temporary buffer for reparse data */
96 struct reparse_buffer_disk rpbuf;
98 /* Temporary buffer for reparse data of "fixed" absolute symbolic links
100 struct reparse_buffer_disk rpfixbuf;
102 /* Array of open handles to filesystem streams currently being written
104 HANDLE open_handles[MAX_OPEN_STREAMS];
106 /* Number of handles in @open_handles currently open (filled in from the
107 * beginning of the array) */
108 unsigned num_open_handles;
110 /* List of dentries, joined by @tmp_list, that need to have reparse data
111 * extracted as soon as the whole stream has been read into
113 struct list_head reparse_dentries;
115 /* List of dentries, joined by @tmp_list, that need to have raw
116 * encrypted data extracted as soon as the whole stream has been read
117 * into @data_buffer. */
118 struct list_head encrypted_dentries;
120 /* Number of files for which we didn't have permission to set the full
121 * security descriptor. */
122 unsigned long partial_security_descriptors;
124 /* Number of files for which we didn't have permission to set any part
125 * of the security descriptor. */
126 unsigned long no_security_descriptors;
128 /* Number of files for which we couldn't set the short name. */
129 unsigned long num_short_name_failures;
131 /* Have we tried to enable short name support on the target volume yet?
133 bool tried_to_enable_short_names;
136 /* Get the drive letter from a Windows path, or return the null character if the
137 * path is relative. */
139 get_drive_letter(const wchar_t *path)
141 /* Skip \\?\ prefix */
142 if (!wcsncmp(path, L"\\\\?\\", 4))
145 /* Return drive letter if valid */
146 if (((path[0] >= L'a' && path[0] <= L'z') ||
147 (path[0] >= L'A' && path[0] <= L'Z')) && path[1] == L':')
154 get_vol_flags(const wchar_t *target, DWORD *vol_flags_ret,
155 bool *short_names_supported_ret)
157 wchar_t filesystem_name[MAX_PATH + 1];
159 wchar_t *volume = NULL;
162 *short_names_supported_ret = false;
164 drive[0] = get_drive_letter(target);
172 if (!GetVolumeInformation(volume, NULL, 0, NULL, NULL,
173 vol_flags_ret, filesystem_name,
174 ARRAY_LEN(filesystem_name)))
176 DWORD err = GetLastError();
177 set_errno_from_win32_error(err);
178 WARNING_WITH_ERRNO("Failed to get volume information for "
179 "\"%ls\" (err=%"PRIu32")",
184 if (wcsstr(filesystem_name, L"NTFS")) {
185 /* FILE_SUPPORTS_HARD_LINKS is only supported on Windows 7 and
186 * later. Force it on anyway if filesystem is NTFS. */
187 *vol_flags_ret |= FILE_SUPPORTS_HARD_LINKS;
189 /* There's no volume flag for short names, but according to the
190 * MS documentation they are only user-settable on NTFS. */
191 *short_names_supported_ret = true;
196 win32_get_supported_features(const wchar_t *target,
197 struct wim_features *supported_features)
200 bool short_names_supported;
202 /* Query the features of the target volume. */
204 get_vol_flags(target, &vol_flags, &short_names_supported);
206 supported_features->archive_files = 1;
207 supported_features->hidden_files = 1;
208 supported_features->system_files = 1;
210 if (vol_flags & FILE_FILE_COMPRESSION)
211 supported_features->compressed_files = 1;
213 if (vol_flags & FILE_SUPPORTS_ENCRYPTION) {
214 supported_features->encrypted_files = 1;
215 supported_features->encrypted_directories = 1;
218 supported_features->not_context_indexed_files = 1;
220 /* Don't do anything with FILE_SUPPORTS_SPARSE_FILES. */
222 if (vol_flags & FILE_NAMED_STREAMS)
223 supported_features->named_data_streams = 1;
225 if (vol_flags & FILE_SUPPORTS_HARD_LINKS)
226 supported_features->hard_links = 1;
228 if (vol_flags & FILE_SUPPORTS_REPARSE_POINTS)
229 supported_features->reparse_points = 1;
231 if (vol_flags & FILE_PERSISTENT_ACLS)
232 supported_features->security_descriptors = 1;
234 if (short_names_supported)
235 supported_features->short_names = 1;
237 supported_features->timestamps = 1;
239 /* Note: Windows does not support case sensitive filenames! At least
240 * not without changing the registry and rebooting... */
245 /* Load the patterns from [PrepopulateList] of WimBootCompress.ini in the WIM
246 * image being extracted. */
248 load_prepopulate_pats(struct win32_apply_ctx *ctx)
250 const wchar_t *path = L"\\Windows\\System32\\WimBootCompress.ini";
251 struct wim_dentry *dentry;
252 struct wim_lookup_table_entry *lte;
255 struct string_set *s;
257 struct text_file_section sec;
259 dentry = get_dentry(ctx->common.wim, path, WIMLIB_CASE_INSENSITIVE);
261 (dentry->d_inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY |
262 FILE_ATTRIBUTE_REPARSE_POINT |
263 FILE_ATTRIBUTE_ENCRYPTED)) ||
264 !(lte = inode_unnamed_lte(dentry->d_inode, ctx->common.wim->lookup_table)))
266 WARNING("%ls does not exist in WIM image!", path);
267 return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
270 ret = read_full_stream_into_alloc_buf(lte, &buf);
274 s = CALLOC(1, sizeof(struct string_set));
277 return WIMLIB_ERR_NOMEM;
280 sec.name = T("PrepopulateList");
283 ret = do_load_text_file(path, buf, lte->size, &mem, &sec, 1,
284 LOAD_TEXT_FILE_REMOVE_QUOTES |
285 LOAD_TEXT_FILE_NO_WARNINGS,
287 BUILD_BUG_ON(OS_PREFERRED_PATH_SEPARATOR != WIM_PATH_SEPARATOR);
293 ctx->wimboot.prepopulate_pats = s;
294 ctx->wimboot.mem_prepopulate_pats = mem;
298 /* Returns %true if the path to @dentry matches a pattern in [PrepopulateList]
299 * of WimBootCompress.ini. Otherwise returns %false.
301 * @dentry must have had its full path calculated. */
303 in_prepopulate_list(struct wim_dentry *dentry,
304 const struct win32_apply_ctx *ctx)
306 const struct string_set *pats = ctx->wimboot.prepopulate_pats;
308 if (!pats || !pats->num_strings)
311 return match_pattern_list(dentry->_full_path,
312 wcslen(dentry->_full_path), pats);
315 /* Calculates the SHA-1 message digest of the WIM's lookup table. */
317 hash_lookup_table(WIMStruct *wim, u8 hash[SHA1_HASH_SIZE])
319 return wim_reshdr_to_hash(&wim->hdr.lookup_table_reshdr, wim, hash);
322 /* Prepare for doing a "WIMBoot" extraction by loading patterns from
323 * [PrepopulateList] of WimBootCompress.ini and allocating a WOF data source ID
324 * on the target volume. */
326 start_wimboot_extraction(struct win32_apply_ctx *ctx)
329 WIMStruct *wim = ctx->common.wim;
331 ret = load_prepopulate_pats(ctx);
332 if (ret == WIMLIB_ERR_NOMEM)
335 if (!wim_info_get_wimboot(wim->wim_info, wim->current_image))
336 WARNING("Image is not marked as WIMBoot compatible!");
338 ret = hash_lookup_table(ctx->common.wim,
339 ctx->wimboot.wim_lookup_table_hash);
343 return wimboot_alloc_data_source_id(wim->filename,
347 &ctx->wimboot.data_source_id,
348 &ctx->wimboot.wof_running);
352 build_win32_extraction_path(const struct wim_dentry *dentry,
353 struct win32_apply_ctx *ctx);
355 /* Sets WimBoot=1 in the extracted SYSTEM registry hive.
357 * WIMGAPI does this, and it's possible that it's important.
358 * But I don't know exactly what this value means to Windows. */
360 end_wimboot_extraction(struct win32_apply_ctx *ctx)
362 struct wim_dentry *dentry;
363 wchar_t subkeyname[32];
369 dentry = get_dentry(ctx->common.wim, L"\\Windows\\System32\\config\\SYSTEM",
370 WIMLIB_CASE_INSENSITIVE);
372 if (!dentry || !will_extract_dentry(dentry))
375 if (!will_extract_dentry(wim_get_current_root_dentry(ctx->common.wim)))
378 /* Not bothering to use the native routines (e.g. NtLoadKey()) for this.
379 * If this doesn't work, you probably also have many other problems. */
381 build_win32_extraction_path(dentry, ctx);
383 randomize_char_array_with_alnum(subkeyname, 20);
384 subkeyname[20] = L'\0';
386 res = RegLoadKey(HKEY_LOCAL_MACHINE, subkeyname, ctx->pathbuf.Buffer);
390 wcscpy(&subkeyname[20], L"\\Setup");
392 res = RegCreateKeyEx(HKEY_LOCAL_MACHINE, subkeyname, 0, NULL,
393 REG_OPTION_BACKUP_RESTORE, 0, NULL, &key, NULL);
399 res = RegSetValueEx(key, L"WimBoot", 0, REG_DWORD,
400 (const BYTE *)&value, sizeof(DWORD));
404 res = RegFlushKey(key);
407 res2 = RegCloseKey(key);
411 subkeyname[20] = L'\0';
412 RegUnLoadKey(HKEY_LOCAL_MACHINE, subkeyname);
416 set_errno_from_win32_error(res);
417 WARNING_WITH_ERRNO("Failed to set \\Setup: dword \"WimBoot\"=1 value "
418 "in registry hive \"%ls\" (err=%"PRIu32")",
419 ctx->pathbuf.Buffer, (u32)res);
425 /* Returns the number of wide characters needed to represent the path to the
426 * specified @dentry, relative to the target directory, when extracted.
428 * Does not include null terminator (not needed for NtCreateFile). */
430 dentry_extraction_path_length(const struct wim_dentry *dentry)
433 const struct wim_dentry *d;
437 len += d->d_extraction_name_nchars + 1;
439 } while (!dentry_is_root(d) && will_extract_dentry(d));
441 return --len; /* No leading slash */
444 /* Returns the length of the longest string that might need to be appended to
445 * the path to an alias of an inode to open or create a named data stream.
447 * If the inode has no named data streams, this will be 0. Otherwise, this will
448 * be 1 plus the length of the longest-named data stream, since the data stream
449 * name must be separated from the path by the ':' character. */
451 inode_longest_named_data_stream_spec(const struct wim_inode *inode)
454 for (u16 i = 0; i < inode->i_num_ads; i++) {
455 size_t len = inode->i_ads_entries[i].stream_name_nbytes;
460 max = 1 + (max / sizeof(wchar_t));
464 /* Find the length, in wide characters, of the longest path needed for
465 * extraction of any file in @dentry_list relative to the target directory.
467 * Accounts for named data streams, but does not include null terminator (not
468 * needed for NtCreateFile). */
470 compute_path_max(struct list_head *dentry_list)
473 const struct wim_dentry *dentry;
475 list_for_each_entry(dentry, dentry_list, d_extraction_list_node) {
478 len = dentry_extraction_path_length(dentry);
480 /* Account for named data streams */
481 len += inode_longest_named_data_stream_spec(dentry->d_inode);
490 /* Build the path at which to extract the @dentry, relative to the target
493 * The path is saved in ctx->pathbuf. */
495 build_extraction_path(const struct wim_dentry *dentry,
496 struct win32_apply_ctx *ctx)
500 const struct wim_dentry *d;
502 len = dentry_extraction_path_length(dentry);
504 ctx->pathbuf.Length = len * sizeof(wchar_t);
505 p = ctx->pathbuf.Buffer + len;
507 !dentry_is_root(d->d_parent) && will_extract_dentry(d->d_parent);
510 p -= d->d_extraction_name_nchars;
511 wmemcpy(p, d->d_extraction_name, d->d_extraction_name_nchars);
514 /* No leading slash */
515 p -= d->d_extraction_name_nchars;
516 wmemcpy(p, d->d_extraction_name, d->d_extraction_name_nchars);
519 /* Build the path at which to extract the @dentry, relative to the target
520 * directory, adding the suffix for a named data stream.
522 * The path is saved in ctx->pathbuf. */
524 build_extraction_path_with_ads(const struct wim_dentry *dentry,
525 struct win32_apply_ctx *ctx,
526 const wchar_t *stream_name,
527 size_t stream_name_nchars)
531 build_extraction_path(dentry, ctx);
533 /* Add :NAME for named data stream */
534 p = ctx->pathbuf.Buffer + (ctx->pathbuf.Length / sizeof(wchar_t));
536 wmemcpy(p, stream_name, stream_name_nchars);
537 ctx->pathbuf.Length += (1 + stream_name_nchars) * sizeof(wchar_t);
540 /* Build the Win32 namespace path to the specified @dentry when extracted.
542 * The path is saved in ctx->pathbuf and will be null terminated.
544 * XXX: We could get rid of this if it wasn't needed for the file encryption
545 * APIs, and the registry manipulation in WIMBoot mode. */
547 build_win32_extraction_path(const struct wim_dentry *dentry,
548 struct win32_apply_ctx *ctx)
550 build_extraction_path(dentry, ctx);
552 /* Prepend target_ntpath to our relative path, then change \??\ into \\?\ */
554 memmove(ctx->pathbuf.Buffer +
555 (ctx->target_ntpath.Length / sizeof(wchar_t)) + 1,
556 ctx->pathbuf.Buffer, ctx->pathbuf.Length);
557 memcpy(ctx->pathbuf.Buffer, ctx->target_ntpath.Buffer,
558 ctx->target_ntpath.Length);
559 ctx->pathbuf.Buffer[ctx->target_ntpath.Length / sizeof(wchar_t)] = L'\\';
560 ctx->pathbuf.Length += ctx->target_ntpath.Length + sizeof(wchar_t);
561 ctx->pathbuf.Buffer[ctx->pathbuf.Length / sizeof(wchar_t)] = L'\0';
563 wimlib_assert(ctx->pathbuf.Length >= 4 * sizeof(wchar_t) &&
564 !wmemcmp(ctx->pathbuf.Buffer, L"\\??\\", 4));
566 ctx->pathbuf.Buffer[1] = L'\\';
570 /* Returns a "printable" representation of the last relative NT path that was
571 * constructed with build_extraction_path() or build_extraction_path_with_ads().
573 * This will be overwritten by the next call to this function. */
574 static const wchar_t *
575 current_path(struct win32_apply_ctx *ctx)
577 wchar_t *p = ctx->print_buffer;
579 p = wmempcpy(p, ctx->common.target, ctx->common.target_nchars);
581 p = wmempcpy(p, ctx->pathbuf.Buffer, ctx->pathbuf.Length / sizeof(wchar_t));
583 return ctx->print_buffer;
587 * Ensures the target directory exists and opens a handle to it, in preparation
588 * of using paths relative to it.
591 prepare_target(struct list_head *dentry_list, struct win32_apply_ctx *ctx)
597 /* Open handle to the target directory (possibly creating it). */
599 ret = win32_path_to_nt_path(ctx->common.target, &ctx->target_ntpath);
603 ctx->attr.Length = sizeof(ctx->attr);
604 ctx->attr.ObjectName = &ctx->target_ntpath;
606 status = (*func_NtCreateFile)(&ctx->h_target,
612 FILE_SHARE_VALID_FLAGS,
614 FILE_DIRECTORY_FILE |
615 FILE_OPEN_REPARSE_POINT |
616 FILE_OPEN_FOR_BACKUP_INTENT,
620 if (!NT_SUCCESS(status)) {
621 set_errno_from_nt_status(status);
622 ERROR_WITH_ERRNO("Can't open or create directory \"%ls\" "
623 "(status=0x%08"PRIx32")",
624 ctx->common.target, (u32)status);
625 return WIMLIB_ERR_OPENDIR;
628 path_max = compute_path_max(dentry_list);
630 /* Add some extra for building Win32 paths for the file encryption APIs
632 path_max += 2 + (ctx->target_ntpath.Length / sizeof(wchar_t));
634 ctx->pathbuf.MaximumLength = path_max * sizeof(wchar_t);
635 ctx->pathbuf.Buffer = MALLOC(ctx->pathbuf.MaximumLength);
636 if (!ctx->pathbuf.Buffer)
637 return WIMLIB_ERR_NOMEM;
639 ctx->attr.RootDirectory = ctx->h_target;
640 ctx->attr.ObjectName = &ctx->pathbuf;
642 ctx->print_buffer = MALLOC((ctx->common.target_nchars + 1 + path_max + 1) *
644 if (!ctx->print_buffer)
645 return WIMLIB_ERR_NOMEM;
650 /* When creating an inode that will have a short (DOS) name, we create it using
651 * the long name associated with the short name. This ensures that the short
652 * name gets associated with the correct long name. */
653 static const struct wim_dentry *
654 first_extraction_alias(const struct wim_inode *inode)
656 const struct list_head *next = inode->i_extraction_aliases.next;
657 const struct wim_dentry *dentry;
660 dentry = list_entry(next, struct wim_dentry,
661 d_extraction_alias_node);
662 if (dentry_has_short_name(dentry))
665 } while (next != &inode->i_extraction_aliases);
670 * Set or clear FILE_ATTRIBUTE_COMPRESSED if the inherited value is different
671 * from the desired value.
673 * Note that you can NOT override the inherited value of
674 * FILE_ATTRIBUTE_COMPRESSED directly with NtCreateFile().
677 adjust_compression_attribute(HANDLE h, const struct wim_dentry *dentry,
678 struct win32_apply_ctx *ctx)
680 const bool compressed = (dentry->d_inode->i_attributes &
681 FILE_ATTRIBUTE_COMPRESSED);
683 if (ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES)
686 if (!ctx->common.supported_features.compressed_files)
689 FILE_BASIC_INFORMATION info;
691 USHORT compression_state;
693 /* Get current attributes */
694 status = (*func_NtQueryInformationFile)(h, &ctx->iosb,
696 FileBasicInformation);
697 if (NT_SUCCESS(status) &&
698 compressed == !!(info.FileAttributes & FILE_ATTRIBUTE_COMPRESSED))
700 /* Nothing needs to be done. */
704 /* Set the new compression state */
707 compression_state = COMPRESSION_FORMAT_DEFAULT;
709 compression_state = COMPRESSION_FORMAT_NONE;
711 status = (*func_NtFsControlFile)(h,
716 FSCTL_SET_COMPRESSION,
721 if (NT_SUCCESS(status))
724 set_errno_from_nt_status(status);
725 ERROR_WITH_ERRNO("Can't %s compression attribute on \"%ls\" "
726 "(status=0x%08"PRIx32")",
727 (compressed ? "set" : "clear"),
728 current_path(ctx), status);
729 return WIMLIB_ERR_SET_ATTRIBUTES;
733 * Clear FILE_ATTRIBUTE_ENCRYPTED if the file or directory is not supposed to be
736 * You can provide FILE_ATTRIBUTE_ENCRYPTED to NtCreateFile() to set it on the
737 * created file. However, the file or directory will otherwise default to the
738 * encryption state of the parent directory. This function works around this
739 * limitation by using DecryptFile() to remove FILE_ATTRIBUTE_ENCRYPTED on files
740 * (and directories) that are not supposed to have it set.
742 * Regardless of whether it succeeds or fails, this function may close the
743 * handle to the file. If it does, it sets it to NULL.
746 maybe_clear_encryption_attribute(HANDLE *h_ptr, const struct wim_dentry *dentry,
747 struct win32_apply_ctx *ctx)
749 if (dentry->d_inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED)
752 if (ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES)
755 if (!ctx->common.supported_features.encrypted_files)
758 FILE_BASIC_INFORMATION info;
762 /* Get current attributes */
763 status = (*func_NtQueryInformationFile)(*h_ptr, &ctx->iosb,
765 FileBasicInformation);
766 if (NT_SUCCESS(status) &&
767 !(info.FileAttributes & FILE_ATTRIBUTE_ENCRYPTED))
769 /* Nothing needs to be done. */
773 /* Set the new encryption state */
775 /* Due to Windows' crappy file encryption APIs, we need to close the
776 * handle to the file so we don't get ERROR_SHARING_VIOLATION. We also
777 * hack together a Win32 path, although we will use the \\?\ prefix so
778 * it will actually be a NT path in disguise... */
779 (*func_NtClose)(*h_ptr);
782 build_win32_extraction_path(dentry, ctx);
784 bret = DecryptFile(ctx->pathbuf.Buffer, 0);
786 /* Restore the NT namespace path */
787 build_extraction_path(dentry, ctx);
790 DWORD err = GetLastError();
791 set_errno_from_win32_error(err);
792 ERROR_WITH_ERRNO("Can't decrypt file \"%ls\" (err=%"PRIu32")",
793 current_path(ctx), (u32)err);
794 return WIMLIB_ERR_SET_ATTRIBUTES;
799 /* Try to enable short name support on the target volume. If successful, return
800 * true. If unsuccessful, issue a warning and return false. */
802 try_to_enable_short_names(const wchar_t *volume)
805 FILE_FS_PERSISTENT_VOLUME_INFORMATION info;
809 h = CreateFile(volume, GENERIC_WRITE,
810 FILE_SHARE_VALID_FLAGS, NULL, OPEN_EXISTING,
811 FILE_FLAG_BACKUP_SEMANTICS, NULL);
812 if (h == INVALID_HANDLE_VALUE)
815 info.VolumeFlags = 0;
816 info.FlagMask = PERSISTENT_VOLUME_STATE_SHORT_NAME_CREATION_DISABLED;
820 bret = DeviceIoControl(h, FSCTL_SET_PERSISTENT_VOLUME_STATE,
821 &info, sizeof(info), NULL, 0,
822 &bytesReturned, NULL);
831 WARNING("Failed to enable short name support on %ls "
832 "(err=%"PRIu32")", volume + 4, (u32)GetLastError());
836 /* Set the short name on the open file @h which has been created at the location
837 * indicated by @dentry.
839 * Note that this may add, change, or remove the short name.
841 * @h must be opened with DELETE access.
843 * Returns 0 or WIMLIB_ERR_SET_SHORT_NAME. The latter only happens in
844 * STRICT_SHORT_NAMES mode.
847 set_short_name(HANDLE h, const struct wim_dentry *dentry,
848 struct win32_apply_ctx *ctx)
851 if (!ctx->common.supported_features.short_names)
855 * Note: The size of the FILE_NAME_INFORMATION buffer must be such that
856 * FileName contains at least 2 wide characters (4 bytes). Otherwise,
857 * NtSetInformationFile() will return STATUS_INFO_LENGTH_MISMATCH. This
858 * is despite the fact that FileNameLength can validly be 0 or 2 bytes,
859 * with the former case being removing the existing short name if
860 * present, rather than setting one.
862 * FileName seemingly does not, however, need to be null-terminated in
866 size_t bufsize = offsetof(FILE_NAME_INFORMATION, FileName) +
867 max(dentry->short_name_nbytes, 2 * sizeof(wchar_t));
868 u8 buf[bufsize] _aligned_attribute(8);
869 FILE_NAME_INFORMATION *info = (FILE_NAME_INFORMATION *)buf;
872 info->FileNameLength = dentry->short_name_nbytes;
873 memcpy(info->FileName, dentry->short_name, dentry->short_name_nbytes);
877 status = (*func_NtSetInformationFile)(h, &ctx->iosb, info, bufsize,
878 FileShortNameInformation);
879 if (NT_SUCCESS(status))
882 if (status == STATUS_SHORT_NAMES_NOT_ENABLED_ON_VOLUME) {
883 if (dentry->short_name_nbytes == 0)
885 if (!ctx->tried_to_enable_short_names) {
889 ctx->tried_to_enable_short_names = true;
891 ret = win32_get_drive_path(ctx->common.target,
895 if (try_to_enable_short_names(volume))
900 /* By default, failure to set short names is not an error (since short
901 * names aren't too important anymore...). */
902 if (!(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES)) {
903 ctx->num_short_name_failures++;
907 if (status == STATUS_SHORT_NAMES_NOT_ENABLED_ON_VOLUME) {
908 ERROR("Can't set short name when short "
909 "names are not enabled on the volume!");
911 ERROR("Can't set short name on \"%ls\" (status=0x%08"PRIx32")",
912 current_path(ctx), (u32)status);
914 return WIMLIB_ERR_SET_SHORT_NAME;
918 * A wrapper around NtCreateFile() to make it slightly more usable...
919 * This uses the path currently constructed in ctx->pathbuf.
921 * Also, we always specify FILE_OPEN_FOR_BACKUP_INTENT and
922 * FILE_OPEN_REPARSE_POINT.
925 do_create_file(PHANDLE FileHandle,
926 ACCESS_MASK DesiredAccess,
927 PLARGE_INTEGER AllocationSize,
928 ULONG FileAttributes,
929 ULONG CreateDisposition,
931 struct win32_apply_ctx *ctx)
933 return (*func_NtCreateFile)(FileHandle,
939 FILE_SHARE_VALID_FLAGS,
942 FILE_OPEN_FOR_BACKUP_INTENT |
943 FILE_OPEN_REPARSE_POINT,
948 /* Like do_create_file(), but builds the extraction path of the @dentry first.
951 create_file(PHANDLE FileHandle,
952 ACCESS_MASK DesiredAccess,
953 PLARGE_INTEGER AllocationSize,
954 ULONG FileAttributes,
955 ULONG CreateDisposition,
957 const struct wim_dentry *dentry,
958 struct win32_apply_ctx *ctx)
960 build_extraction_path(dentry, ctx);
961 return do_create_file(FileHandle,
970 /* Create empty named data streams.
972 * Since these won't have 'struct wim_lookup_table_entry's, they won't show up
973 * in the call to extract_stream_list(). Hence the need for the special case.
976 create_any_empty_ads(const struct wim_dentry *dentry,
977 struct win32_apply_ctx *ctx)
979 const struct wim_inode *inode = dentry->d_inode;
980 LARGE_INTEGER allocation_size;
981 bool path_modified = false;
984 if (!ctx->common.supported_features.named_data_streams)
987 for (u16 i = 0; i < inode->i_num_ads; i++) {
988 const struct wim_ads_entry *entry;
992 entry = &inode->i_ads_entries[i];
995 if (!entry->stream_name_nbytes)
1002 /* Probably setting the allocation size to 0 has no effect, but
1003 * we might as well try. */
1004 allocation_size.QuadPart = 0;
1006 build_extraction_path_with_ads(dentry, ctx,
1008 entry->stream_name_nbytes /
1010 path_modified = true;
1011 status = do_create_file(&h, FILE_WRITE_DATA, &allocation_size,
1012 0, FILE_SUPERSEDE, 0, ctx);
1013 if (!NT_SUCCESS(status)) {
1014 set_errno_from_nt_status(status);
1015 ERROR_WITH_ERRNO("Can't create \"%ls\" "
1016 "(status=0x%08"PRIx32")",
1017 current_path(ctx), (u32)status);
1018 ret = WIMLIB_ERR_OPEN;
1023 /* Restore the path to the dentry itself */
1025 build_extraction_path(dentry, ctx);
1030 * Creates the directory named by @dentry, or uses an existing directory at that
1031 * location. If necessary, sets the short name and/or fixes compression and
1032 * encryption attributes.
1034 * Returns 0, WIMLIB_ERR_MKDIR, or WIMLIB_ERR_SET_SHORT_NAME.
1037 create_directory(const struct wim_dentry *dentry,
1038 struct win32_apply_ctx *ctx)
1045 /* Special attributes:
1047 * Use FILE_ATTRIBUTE_ENCRYPTED if the directory needs to have it set.
1048 * This doesn't work for FILE_ATTRIBUTE_COMPRESSED (unfortunately).
1050 * Don't specify FILE_ATTRIBUTE_DIRECTORY; it gets set anyway as a
1051 * result of the FILE_DIRECTORY_FILE option. */
1052 attrib = (dentry->d_inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED);
1054 /* DELETE is needed for set_short_name().
1055 * GENERIC_READ and GENERIC_WRITE are needed for
1056 * adjust_compression_attribute(). */
1057 status = create_file(&h, GENERIC_READ | GENERIC_WRITE | DELETE, NULL,
1058 attrib, FILE_OPEN_IF, FILE_DIRECTORY_FILE,
1060 if (!NT_SUCCESS(status)) {
1061 set_errno_from_nt_status(status);
1062 ERROR_WITH_ERRNO("Can't create directory \"%ls\" "
1063 "(status=0x%08"PRIx32")",
1064 current_path(ctx), (u32)status);
1065 return WIMLIB_ERR_MKDIR;
1068 ret = set_short_name(h, dentry, ctx);
1071 ret = adjust_compression_attribute(h, dentry, ctx);
1074 ret = maybe_clear_encryption_attribute(&h, dentry, ctx);
1075 /* May close the handle!!! */
1083 * Create all the directories being extracted, other than the target directory
1086 * Note: we don't honor directory hard links. However, we don't allow them to
1087 * exist in WIM images anyway (see inode_fixup.c).
1090 create_directories(struct list_head *dentry_list,
1091 struct win32_apply_ctx *ctx)
1093 const struct wim_dentry *dentry;
1096 list_for_each_entry(dentry, dentry_list, d_extraction_list_node) {
1098 if (!(dentry->d_inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY))
1101 /* Note: Here we include files with
1102 * FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_REPARSE_POINT, but we
1103 * wait until later to actually set the reparse data. */
1105 /* If the root dentry is being extracted, it was already done so
1106 * in prepare_target(). */
1107 if (dentry_is_root(dentry))
1110 ret = create_directory(dentry, ctx);
1114 ret = create_any_empty_ads(dentry, ctx);
1118 ret = report_file_created(&ctx->common);
1126 * Creates the nondirectory file named by @dentry.
1128 * On success, returns an open handle to the file in @h_ret, with GENERIC_READ,
1129 * GENERIC_WRITE, and DELETE access. Also, the path to the file will be saved
1130 * in ctx->pathbuf. On failure, returns WIMLIB_ERR_OPEN.
1133 create_nondirectory_inode(HANDLE *h_ret, const struct wim_dentry *dentry,
1134 struct win32_apply_ctx *ctx)
1136 const struct wim_inode *inode;
1139 bool retried = false;
1141 inode = dentry->d_inode;
1143 /* If the file already exists and has FILE_ATTRIBUTE_SYSTEM and/or
1144 * FILE_ATTRIBUTE_HIDDEN, these must be specified in order to supersede
1147 * Normally the user shouldn't be trying to overwrite such files anyway,
1148 * but we at least provide FILE_ATTRIBUTE_SYSTEM and
1149 * FILE_ATTRIBUTE_HIDDEN if the WIM inode has those attributes so that
1150 * we catch the case where the user extracts the same files to the same
1151 * location more than one time.
1153 * Also specify FILE_ATTRIBUTE_ENCRYPTED if the file needs to be
1156 * In NO_ATTRIBUTES mode just don't specify any attributes at all.
1158 if (ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES) {
1161 attrib = (inode->i_attributes & (FILE_ATTRIBUTE_SYSTEM |
1162 FILE_ATTRIBUTE_HIDDEN |
1163 FILE_ATTRIBUTE_ENCRYPTED));
1165 build_extraction_path(dentry, ctx);
1167 status = do_create_file(h_ret, GENERIC_READ | GENERIC_WRITE | DELETE,
1168 NULL, attrib, FILE_SUPERSEDE,
1169 FILE_NON_DIRECTORY_FILE, ctx);
1170 if (NT_SUCCESS(status)) {
1173 ret = adjust_compression_attribute(*h_ret, dentry, ctx);
1175 (*func_NtClose)(*h_ret);
1179 ret = maybe_clear_encryption_attribute(h_ret, dentry, ctx);
1180 /* May close the handle!!! */
1184 (*func_NtClose)(*h_ret);
1189 /* Re-open the handle so that we can return it on
1191 status = do_create_file(h_ret,
1193 GENERIC_WRITE | DELETE,
1195 FILE_NON_DIRECTORY_FILE, ctx);
1196 if (!NT_SUCCESS(status))
1200 ret = create_any_empty_ads(dentry, ctx);
1202 (*func_NtClose)(*h_ret);
1208 if (status == STATUS_ACCESS_DENIED && !retried) {
1209 /* We also can't supersede an existing file that has
1210 * FILE_ATTRIBUTE_READONLY set; doing so causes NtCreateFile()
1211 * to return STATUS_ACCESS_DENIED . The only workaround seems
1212 * to be to explicitly remove FILE_ATTRIBUTE_READONLY on the
1213 * existing file, then try again. */
1215 FILE_BASIC_INFORMATION info;
1218 status = do_create_file(&h, FILE_WRITE_ATTRIBUTES, NULL, 0,
1219 FILE_OPEN, FILE_NON_DIRECTORY_FILE, ctx);
1220 if (!NT_SUCCESS(status))
1223 memset(&info, 0, sizeof(info));
1224 info.FileAttributes = FILE_ATTRIBUTE_NORMAL;
1226 status = (*func_NtSetInformationFile)(h, &ctx->iosb,
1227 &info, sizeof(info),
1228 FileBasicInformation);
1230 if (!NT_SUCCESS(status))
1236 set_errno_from_nt_status(status);
1237 ERROR_WITH_ERRNO("Can't create file \"%ls\" (status=0x%08"PRIx32")",
1238 current_path(ctx), (u32)status);
1239 return WIMLIB_ERR_OPEN;
1242 /* Creates a hard link at the location named by @dentry to the file represented
1243 * by the open handle @h. Or, if the target volume does not support hard links,
1244 * create a separate file instead. */
1246 create_link(HANDLE h, const struct wim_dentry *dentry,
1247 struct win32_apply_ctx *ctx)
1249 if (ctx->common.supported_features.hard_links) {
1251 build_extraction_path(dentry, ctx);
1253 size_t bufsize = offsetof(FILE_LINK_INFORMATION, FileName) +
1254 ctx->pathbuf.Length + sizeof(wchar_t);
1255 u8 buf[bufsize] _aligned_attribute(8);
1256 FILE_LINK_INFORMATION *info = (FILE_LINK_INFORMATION *)buf;
1259 info->ReplaceIfExists = TRUE;
1260 info->RootDirectory = ctx->attr.RootDirectory;
1261 info->FileNameLength = ctx->pathbuf.Length;
1262 memcpy(info->FileName, ctx->pathbuf.Buffer, ctx->pathbuf.Length);
1263 info->FileName[info->FileNameLength / 2] = L'\0';
1265 /* Note: the null terminator isn't actually necessary,
1266 * but if you don't add the extra character, you get
1267 * STATUS_INFO_LENGTH_MISMATCH when FileNameLength
1268 * happens to be 2 */
1270 status = (*func_NtSetInformationFile)(h, &ctx->iosb,
1272 FileLinkInformation);
1273 if (NT_SUCCESS(status))
1275 ERROR("Failed to create link \"%ls\" (status=0x%08"PRIx32")",
1276 current_path(ctx), (u32)status);
1277 return WIMLIB_ERR_LINK;
1282 ret = create_nondirectory_inode(&h2, dentry, ctx);
1286 (*func_NtClose)(h2);
1291 /* Given an inode (represented by the open handle @h) for which one link has
1292 * been created (named by @first_dentry), create the other links.
1294 * Or, if the target volume does not support hard links, create separate files.
1296 * Note: This uses ctx->pathbuf and does not reset it.
1299 create_links(HANDLE h, const struct wim_dentry *first_dentry,
1300 struct win32_apply_ctx *ctx)
1302 const struct wim_inode *inode;
1303 const struct list_head *next;
1304 const struct wim_dentry *dentry;
1307 inode = first_dentry->d_inode;
1308 next = inode->i_extraction_aliases.next;
1310 dentry = list_entry(next, struct wim_dentry,
1311 d_extraction_alias_node);
1312 if (dentry != first_dentry) {
1313 ret = create_link(h, dentry, ctx);
1318 } while (next != &inode->i_extraction_aliases);
1322 /* Create a nondirectory file, including all links. */
1324 create_nondirectory(const struct wim_inode *inode, struct win32_apply_ctx *ctx)
1326 const struct wim_dentry *first_dentry;
1330 first_dentry = first_extraction_alias(inode);
1332 /* Create first link. */
1333 ret = create_nondirectory_inode(&h, first_dentry, ctx);
1337 /* Set short name. */
1338 ret = set_short_name(h, first_dentry, ctx);
1340 /* Create additional links, OR if hard links are not supported just
1341 * create more files. */
1343 ret = create_links(h, first_dentry, ctx);
1349 /* Create all the nondirectory files being extracted, including all aliases
1352 create_nondirectories(struct list_head *dentry_list, struct win32_apply_ctx *ctx)
1354 const struct wim_dentry *dentry;
1355 const struct wim_inode *inode;
1358 list_for_each_entry(dentry, dentry_list, d_extraction_list_node) {
1359 inode = dentry->d_inode;
1360 if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY)
1362 /* Call create_nondirectory() only once per inode */
1363 if (dentry != inode_first_extraction_dentry(inode))
1365 ret = create_nondirectory(inode, ctx);
1368 ret = report_file_created(&ctx->common);
1376 close_handles(struct win32_apply_ctx *ctx)
1378 for (unsigned i = 0; i < ctx->num_open_handles; i++)
1379 (*func_NtClose)(ctx->open_handles[i]);
1382 /* Prepare to read the next stream, which has size @stream_size, into an
1383 * in-memory buffer. */
1385 prepare_data_buffer(struct win32_apply_ctx *ctx, u64 stream_size)
1387 if (stream_size > ctx->data_buffer_size) {
1388 /* Larger buffer needed. */
1390 if ((size_t)stream_size != stream_size)
1391 return WIMLIB_ERR_NOMEM;
1392 new_buffer = REALLOC(ctx->data_buffer, stream_size);
1394 return WIMLIB_ERR_NOMEM;
1395 ctx->data_buffer = new_buffer;
1396 ctx->data_buffer_size = stream_size;
1398 /* On the first call this changes data_buffer_ptr from NULL, which tells
1399 * extract_chunk() that the data buffer needs to be filled while reading
1400 * the stream data. */
1401 ctx->data_buffer_ptr = ctx->data_buffer;
1406 begin_extract_stream_instance(const struct wim_lookup_table_entry *stream,
1407 struct wim_dentry *dentry,
1408 const wchar_t *stream_name,
1409 struct win32_apply_ctx *ctx)
1411 const struct wim_inode *inode = dentry->d_inode;
1412 size_t stream_name_nchars = 0;
1413 FILE_ALLOCATION_INFORMATION alloc_info;
1417 if (unlikely(stream_name))
1418 stream_name_nchars = wcslen(stream_name);
1420 if (unlikely(stream_name_nchars)) {
1421 build_extraction_path_with_ads(dentry, ctx,
1422 stream_name, stream_name_nchars);
1424 build_extraction_path(dentry, ctx);
1427 /* Reparse point? */
1428 if (unlikely(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT)
1429 && (stream_name_nchars == 0))
1431 if (!ctx->common.supported_features.reparse_points)
1434 /* We can't write the reparse stream directly; we must set it
1435 * with FSCTL_SET_REPARSE_POINT, which requires that all the
1436 * data be available. So, stage the data in a buffer. */
1438 list_add_tail(&dentry->tmp_list, &ctx->reparse_dentries);
1439 return prepare_data_buffer(ctx, stream->size);
1442 /* Encrypted file? */
1443 if (unlikely(inode->i_attributes & FILE_ATTRIBUTE_ENCRYPTED)
1444 && (stream_name_nchars == 0))
1446 if (!ctx->common.supported_features.encrypted_files)
1449 /* We can't write encrypted file streams directly; we must use
1450 * WriteEncryptedFileRaw(), which requires providing the data
1451 * through a callback function. This can't easily be combined
1452 * with our own callback-based approach.
1454 * The current workaround is to simply read the stream into
1455 * memory and write the encrypted file from that.
1457 * TODO: This isn't sufficient for extremely large encrypted
1458 * files. Perhaps we should create an extra thread to write
1460 list_add_tail(&dentry->tmp_list, &ctx->encrypted_dentries);
1461 return prepare_data_buffer(ctx, stream->size);
1464 /* Extracting unnamed data stream in WIMBoot mode? */
1465 if (unlikely(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_WIMBOOT)
1466 && (stream_name_nchars == 0)
1467 && (stream->resource_location == RESOURCE_IN_WIM)
1468 && (stream->rspec->wim == ctx->common.wim)
1469 && (stream->size == stream->rspec->uncompressed_size))
1471 int ret = calculate_dentry_full_path(dentry);
1474 if (in_prepopulate_list(dentry, ctx)) {
1475 union wimlib_progress_info info;
1477 info.wimboot_exclude.path_in_wim = dentry->_full_path;
1478 info.wimboot_exclude.extraction_path = current_path(ctx);
1480 ret = call_progress(ctx->common.progfunc,
1481 WIMLIB_PROGRESS_MSG_WIMBOOT_EXCLUDE,
1482 &info, ctx->common.progctx);
1483 FREE(dentry->_full_path);
1484 dentry->_full_path = NULL;
1487 /* Go on and open the file for normal extraction. */
1489 FREE(dentry->_full_path);
1490 dentry->_full_path = NULL;
1491 return wimboot_set_pointer(&ctx->attr,
1494 ctx->wimboot.data_source_id,
1495 ctx->wimboot.wim_lookup_table_hash,
1496 ctx->wimboot.wof_running);
1500 if (ctx->num_open_handles == MAX_OPEN_STREAMS) {
1501 /* XXX: Fix this. But because of the checks in
1502 * extract_stream_list(), this can now only happen on a
1503 * filesystem that does not support hard links. */
1504 ERROR("Can't extract data: too many open files!");
1505 return WIMLIB_ERR_UNSUPPORTED;
1508 /* Open a new handle */
1509 status = do_create_file(&h,
1510 FILE_WRITE_DATA | SYNCHRONIZE,
1511 NULL, 0, FILE_OPEN_IF,
1512 FILE_SEQUENTIAL_ONLY |
1513 FILE_SYNCHRONOUS_IO_NONALERT,
1515 if (!NT_SUCCESS(status)) {
1516 set_errno_from_nt_status(status);
1517 ERROR_WITH_ERRNO("Can't open \"%ls\" for writing "
1518 "(status=0x%08"PRIx32")",
1519 current_path(ctx), (u32)status);
1520 return WIMLIB_ERR_OPEN;
1523 ctx->open_handles[ctx->num_open_handles++] = h;
1525 /* Allocate space for the data. */
1526 alloc_info.AllocationSize.QuadPart = stream->size;
1527 (*func_NtSetInformationFile)(h, &ctx->iosb,
1528 &alloc_info, sizeof(alloc_info),
1529 FileAllocationInformation);
1533 /* Set the reparse data @rpbuf of length @rpbuflen on the extracted file
1534 * corresponding to the WIM dentry @dentry. */
1536 do_set_reparse_data(const struct wim_dentry *dentry,
1537 const void *rpbuf, u16 rpbuflen,
1538 struct win32_apply_ctx *ctx)
1543 status = create_file(&h, GENERIC_WRITE, NULL,
1544 0, FILE_OPEN, 0, dentry, ctx);
1545 if (!NT_SUCCESS(status))
1548 status = (*func_NtFsControlFile)(h, NULL, NULL, NULL,
1549 &ctx->iosb, FSCTL_SET_REPARSE_POINT,
1550 (void *)rpbuf, rpbuflen,
1554 if (NT_SUCCESS(status))
1557 /* On Windows, by default only the Administrator can create symbolic
1558 * links for some reason. By default we just issue a warning if this
1559 * appears to be the problem. Use WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS
1560 * to get a hard error. */
1561 if (!(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_SYMLINKS)
1562 && (status == STATUS_PRIVILEGE_NOT_HELD ||
1563 status == STATUS_ACCESS_DENIED)
1564 && (dentry->d_inode->i_reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
1565 dentry->d_inode->i_reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT))
1567 WARNING("Can't create symbolic link \"%ls\"! \n"
1568 " (Need Administrator rights, or at least "
1570 " SeCreateSymbolicLink privilege.)",
1576 set_errno_from_nt_status(status);
1577 ERROR_WITH_ERRNO("Can't set reparse data on \"%ls\" "
1578 "(status=0x%08"PRIx32")",
1579 current_path(ctx), (u32)status);
1580 return WIMLIB_ERR_SET_REPARSE_DATA;
1583 /* Given a Windows NT namespace path, such as \??\e:\Windows\System32, return a
1584 * pointer to the suffix of the path that begins with the device directly, such
1585 * as e:\Windows\System32. */
1586 static const wchar_t *
1587 skip_nt_toplevel_component(const wchar_t *path, size_t path_nchars)
1589 static const wchar_t * const dirs[] = {
1594 size_t first_dir_len = 0;
1595 const wchar_t * const end = path + path_nchars;
1597 for (size_t i = 0; i < ARRAY_LEN(dirs); i++) {
1598 size_t len = wcslen(dirs[i]);
1599 if (len <= (end - path) && !wcsnicmp(path, dirs[i], len)) {
1600 first_dir_len = len;
1604 if (first_dir_len == 0)
1606 path += first_dir_len;
1607 while (path != end && *path == L'\\')
1612 /* Given a Windows NT namespace path, such as \??\e:\Windows\System32, return a
1613 * pointer to the suffix of the path that is device-relative, such as
1616 * The path has an explicit length and is not necessarily null terminated.
1618 * If the path just something like \??\e: then the returned pointer will point
1619 * just past the colon. In this case the length of the result will be 0
1621 static const wchar_t *
1622 get_device_relative_path(const wchar_t *path, size_t path_nchars)
1624 const wchar_t * const orig_path = path;
1625 const wchar_t * const end = path + path_nchars;
1627 path = skip_nt_toplevel_component(path, path_nchars);
1628 if (path == orig_path)
1631 path = wmemchr(path, L'\\', (end - path));
1636 } while (path != end && *path == L'\\');
1641 * Given a reparse point buffer for a symbolic link or junction, adjust its
1642 * contents so that the target of the link is consistent with the new location
1646 try_rpfix(u8 *rpbuf, u16 *rpbuflen_p, struct win32_apply_ctx *ctx)
1648 struct reparse_data rpdata;
1649 size_t orig_subst_name_nchars;
1650 const wchar_t *relpath;
1651 size_t relpath_nchars;
1652 size_t target_ntpath_nchars;
1653 size_t fixed_subst_name_nchars;
1654 const wchar_t *fixed_print_name;
1655 size_t fixed_print_name_nchars;
1657 if (parse_reparse_data(rpbuf, *rpbuflen_p, &rpdata)) {
1658 /* Do nothing if the reparse data is invalid. */
1662 if (rpdata.rptag == WIM_IO_REPARSE_TAG_SYMLINK &&
1663 (rpdata.rpflags & SYMBOLIC_LINK_RELATIVE))
1665 /* Do nothing if it's a relative symbolic link. */
1669 /* Build the new substitute name from the NT namespace path to the
1670 * target directory, then a path separator, then the "device relative"
1671 * part of the old substitute name. */
1673 orig_subst_name_nchars = rpdata.substitute_name_nbytes / sizeof(wchar_t);
1675 relpath = get_device_relative_path(rpdata.substitute_name,
1676 orig_subst_name_nchars);
1677 relpath_nchars = orig_subst_name_nchars -
1678 (relpath - rpdata.substitute_name);
1680 target_ntpath_nchars = ctx->target_ntpath.Length / sizeof(wchar_t);
1682 fixed_subst_name_nchars = target_ntpath_nchars;
1684 fixed_subst_name_nchars += 1 + relpath_nchars;
1685 wchar_t fixed_subst_name[fixed_subst_name_nchars];
1687 wmemcpy(fixed_subst_name, ctx->target_ntpath.Buffer,
1688 target_ntpath_nchars);
1689 if (relpath_nchars) {
1690 fixed_subst_name[target_ntpath_nchars] = L'\\';
1691 wmemcpy(&fixed_subst_name[target_ntpath_nchars + 1],
1692 relpath, relpath_nchars);
1694 /* Doesn't need to be null-terminated. */
1696 /* Print name should be Win32, but not all NT names can even be
1697 * translated to Win32 names. But we can at least delete the top-level
1698 * directory, such as \??\, and this will have the expected result in
1699 * the usual case. */
1700 fixed_print_name = skip_nt_toplevel_component(fixed_subst_name,
1701 fixed_subst_name_nchars);
1702 fixed_print_name_nchars = fixed_subst_name_nchars - (fixed_print_name -
1705 rpdata.substitute_name = fixed_subst_name;
1706 rpdata.substitute_name_nbytes = fixed_subst_name_nchars * sizeof(wchar_t);
1707 rpdata.print_name = (wchar_t *)fixed_print_name;
1708 rpdata.print_name_nbytes = fixed_print_name_nchars * sizeof(wchar_t);
1709 make_reparse_buffer(&rpdata, rpbuf, rpbuflen_p);
1712 /* Sets reparse data on the specified file. This handles "fixing" the targets
1713 * of absolute symbolic links and junctions if WIMLIB_EXTRACT_FLAG_RPFIX was
1716 set_reparse_data(const struct wim_dentry *dentry,
1717 const void *_rpbuf, u16 rpbuflen, struct win32_apply_ctx *ctx)
1719 const struct wim_inode *inode = dentry->d_inode;
1720 const void *rpbuf = _rpbuf;
1722 if ((ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_RPFIX)
1723 && !inode->i_not_rpfixed
1724 && (inode->i_reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
1725 inode->i_reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT))
1727 memcpy(&ctx->rpfixbuf, _rpbuf, rpbuflen);
1728 try_rpfix((u8 *)&ctx->rpfixbuf, &rpbuflen, ctx);
1729 rpbuf = &ctx->rpfixbuf;
1731 return do_set_reparse_data(dentry, rpbuf, rpbuflen, ctx);
1735 /* Import the next block of raw encrypted data */
1737 import_encrypted_data(PBYTE pbData, PVOID pvCallbackContext, PULONG Length)
1739 struct win32_apply_ctx *ctx = pvCallbackContext;
1742 copy_len = min(ctx->encrypted_size - ctx->encrypted_offset, *Length);
1743 memcpy(pbData, &ctx->data_buffer[ctx->encrypted_offset], copy_len);
1744 ctx->encrypted_offset += copy_len;
1746 return ERROR_SUCCESS;
1749 /* Write the raw encrypted data to the already-created file corresponding to
1752 * The raw encrypted data is provided in ctx->data_buffer, and its size is
1753 * ctx->encrypted_size. */
1755 extract_encrypted_file(const struct wim_dentry *dentry,
1756 struct win32_apply_ctx *ctx)
1761 /* Temporarily build a Win32 path for OpenEncryptedFileRaw() */
1762 build_win32_extraction_path(dentry, ctx);
1764 err = OpenEncryptedFileRaw(ctx->pathbuf.Buffer,
1765 CREATE_FOR_IMPORT, &rawctx);
1767 /* Restore the NT namespace path */
1768 build_extraction_path(dentry, ctx);
1770 if (err != ERROR_SUCCESS) {
1771 set_errno_from_win32_error(err);
1772 ERROR_WITH_ERRNO("Can't open \"%ls\" for encrypted import "
1773 "(err=%"PRIu32")", current_path(ctx), (u32)err);
1774 return WIMLIB_ERR_OPEN;
1777 ctx->encrypted_offset = 0;
1779 err = WriteEncryptedFileRaw(import_encrypted_data, ctx, rawctx);
1781 CloseEncryptedFileRaw(rawctx);
1783 if (err != ERROR_SUCCESS) {
1784 set_errno_from_win32_error(err);
1785 ERROR_WITH_ERRNO("Can't import encrypted file \"%ls\" "
1786 "(err=%"PRIu32")", current_path(ctx), (u32)err);
1787 return WIMLIB_ERR_WRITE;
1793 /* Called when starting to read a stream for extraction on Windows */
1795 begin_extract_stream(struct wim_lookup_table_entry *stream, void *_ctx)
1797 struct win32_apply_ctx *ctx = _ctx;
1798 const struct stream_owner *owners = stream_owners(stream);
1801 ctx->num_open_handles = 0;
1802 ctx->data_buffer_ptr = NULL;
1803 INIT_LIST_HEAD(&ctx->reparse_dentries);
1804 INIT_LIST_HEAD(&ctx->encrypted_dentries);
1806 for (u32 i = 0; i < stream->out_refcnt; i++) {
1807 const struct wim_inode *inode = owners[i].inode;
1808 const wchar_t *stream_name = owners[i].stream_name;
1809 struct wim_dentry *dentry;
1811 /* A copy of the stream needs to be extracted to @inode. */
1813 if (ctx->common.supported_features.hard_links) {
1814 dentry = inode_first_extraction_dentry(inode);
1815 ret = begin_extract_stream_instance(stream, dentry,
1820 /* Hard links not supported. Extract the stream
1821 * separately to each alias of the inode. */
1822 struct list_head *next;
1824 next = inode->i_extraction_aliases.next;
1826 dentry = list_entry(next, struct wim_dentry,
1827 d_extraction_alias_node);
1828 ret = begin_extract_stream_instance(stream,
1835 } while (next != &inode->i_extraction_aliases);
1846 /* Called when the next chunk of a stream has been read for extraction on
1849 extract_chunk(const void *chunk, size_t size, void *_ctx)
1851 struct win32_apply_ctx *ctx = _ctx;
1853 /* Write the data chunk to each open handle */
1854 for (unsigned i = 0; i < ctx->num_open_handles; i++) {
1855 u8 *bufptr = (u8 *)chunk;
1856 size_t bytes_remaining = size;
1858 while (bytes_remaining) {
1859 ULONG count = min(0xFFFFFFFF, bytes_remaining);
1861 status = (*func_NtWriteFile)(ctx->open_handles[i],
1863 &ctx->iosb, bufptr, count,
1865 if (!NT_SUCCESS(status)) {
1866 set_errno_from_nt_status(status);
1867 ERROR_WITH_ERRNO("Error writing data to target "
1868 "volume (status=0x%08"PRIx32")",
1870 return WIMLIB_ERR_WRITE;
1872 bufptr += ctx->iosb.Information;
1873 bytes_remaining -= ctx->iosb.Information;
1877 /* Copy the data chunk into the buffer (if needed) */
1878 if (ctx->data_buffer_ptr)
1879 ctx->data_buffer_ptr = mempcpy(ctx->data_buffer_ptr,
1884 /* Called when a stream has been fully read for extraction on Windows */
1886 end_extract_stream(struct wim_lookup_table_entry *stream, int status, void *_ctx)
1888 struct win32_apply_ctx *ctx = _ctx;
1890 const struct wim_dentry *dentry;
1897 if (likely(!ctx->data_buffer_ptr))
1900 if (!list_empty(&ctx->reparse_dentries)) {
1901 if (stream->size > REPARSE_DATA_MAX_SIZE) {
1902 dentry = list_first_entry(&ctx->reparse_dentries,
1903 struct wim_dentry, tmp_list);
1904 build_extraction_path(dentry, ctx);
1905 ERROR("Reparse data of \"%ls\" has size "
1906 "%"PRIu64" bytes (exceeds %u bytes)",
1907 current_path(ctx), stream->size,
1908 REPARSE_DATA_MAX_SIZE);
1909 return WIMLIB_ERR_INVALID_REPARSE_DATA;
1911 /* In the WIM format, reparse streams are just the reparse data
1912 * and omit the header. But we can reconstruct the header. */
1913 memcpy(ctx->rpbuf.rpdata, ctx->data_buffer, stream->size);
1914 ctx->rpbuf.rpdatalen = stream->size;
1915 ctx->rpbuf.rpreserved = 0;
1916 list_for_each_entry(dentry, &ctx->reparse_dentries, tmp_list) {
1917 ctx->rpbuf.rptag = dentry->d_inode->i_reparse_tag;
1918 ret = set_reparse_data(dentry, &ctx->rpbuf,
1919 stream->size + REPARSE_DATA_OFFSET,
1926 if (!list_empty(&ctx->encrypted_dentries)) {
1927 ctx->encrypted_size = stream->size;
1928 list_for_each_entry(dentry, &ctx->encrypted_dentries, tmp_list) {
1929 ret = extract_encrypted_file(dentry, ctx);
1938 /* Attributes that can't be set directly */
1939 #define SPECIAL_ATTRIBUTES \
1940 (FILE_ATTRIBUTE_REPARSE_POINT | \
1941 FILE_ATTRIBUTE_DIRECTORY | \
1942 FILE_ATTRIBUTE_ENCRYPTED | \
1943 FILE_ATTRIBUTE_SPARSE_FILE | \
1944 FILE_ATTRIBUTE_COMPRESSED)
1946 /* Set the security descriptor @desc, of @desc_size bytes, on the file with open
1949 set_security_descriptor(HANDLE h, const void *desc,
1950 size_t desc_size, struct win32_apply_ctx *ctx)
1952 SECURITY_INFORMATION info;
1955 /* We really just want to set entire the security descriptor as-is, but
1956 * all available APIs require specifying the specific parts of the
1957 * descriptor being set. Start out by requesting all parts be set. If
1958 * permissions problems are encountered, fall back to omitting some
1959 * parts (first the SACL, then the DACL, then the owner), unless the
1960 * WIMLIB_EXTRACT_FLAG_STRICT_ACLS flag has been enabled. */
1961 info = OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
1962 DACL_SECURITY_INFORMATION | SACL_SECURITY_INFORMATION;
1964 /* Prefer NtSetSecurityObject() to SetFileSecurity(). SetFileSecurity()
1965 * itself necessarily uses NtSetSecurityObject() as the latter is the
1966 * underlying system call for setting security information, but
1967 * SetFileSecurity() opens the handle with NtCreateFile() without
1968 * FILE_OPEN_FILE_BACKUP_INTENT. Hence, access checks are done and due
1969 * to the Windows security model, even a process running as the
1970 * Administrator can have access denied. (Of course, this not mentioned
1971 * in the MS "documentation".) */
1973 status = (*func_NtSetSecurityObject)(h, info, (PSECURITY_DESCRIPTOR)desc);
1974 if (NT_SUCCESS(status))
1976 /* Failed to set the requested parts of the security descriptor. If the
1977 * error was permissions-related, try to set fewer parts of the security
1978 * descriptor, unless WIMLIB_EXTRACT_FLAG_STRICT_ACLS is enabled. */
1979 if ((status == STATUS_PRIVILEGE_NOT_HELD ||
1980 status == STATUS_ACCESS_DENIED) &&
1981 !(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_ACLS))
1983 if (info & SACL_SECURITY_INFORMATION) {
1984 info &= ~SACL_SECURITY_INFORMATION;
1985 ctx->partial_security_descriptors++;
1988 if (info & DACL_SECURITY_INFORMATION) {
1989 info &= ~DACL_SECURITY_INFORMATION;
1992 if (info & OWNER_SECURITY_INFORMATION) {
1993 info &= ~OWNER_SECURITY_INFORMATION;
1996 /* Nothing left except GROUP, and if we removed it we
1997 * wouldn't have anything at all. */
2000 /* No part of the security descriptor could be set, or
2001 * WIMLIB_EXTRACT_FLAG_STRICT_ACLS is enabled and the full security
2002 * descriptor could not be set. */
2003 if (!(info & SACL_SECURITY_INFORMATION))
2004 ctx->partial_security_descriptors--;
2005 ctx->no_security_descriptors++;
2009 /* Set metadata on the open file @h from the WIM inode @inode. */
2011 do_apply_metadata_to_file(HANDLE h, const struct wim_inode *inode,
2012 struct win32_apply_ctx *ctx)
2014 FILE_BASIC_INFORMATION info;
2017 /* Set security descriptor if present and not in NO_ACLS mode */
2018 if (inode->i_security_id >= 0 &&
2019 !(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_NO_ACLS))
2021 const struct wim_security_data *sd;
2025 sd = wim_get_current_security_data(ctx->common.wim);
2026 desc = sd->descriptors[inode->i_security_id];
2027 desc_size = sd->sizes[inode->i_security_id];
2029 status = set_security_descriptor(h, desc, desc_size, ctx);
2030 if (!NT_SUCCESS(status) &&
2031 (ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_ACLS))
2033 set_errno_from_nt_status(status);
2034 ERROR_WITH_ERRNO("Can't set security descriptor "
2035 "on \"%ls\" (status=0x%08"PRIx32")",
2036 current_path(ctx), (u32)status);
2037 return WIMLIB_ERR_SET_SECURITY;
2041 /* Set attributes and timestamps */
2042 info.CreationTime.QuadPart = inode->i_creation_time;
2043 info.LastAccessTime.QuadPart = inode->i_last_access_time;
2044 info.LastWriteTime.QuadPart = inode->i_last_write_time;
2045 info.ChangeTime.QuadPart = 0;
2046 if (ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_NO_ATTRIBUTES)
2047 info.FileAttributes = 0;
2049 info.FileAttributes = inode->i_attributes & ~SPECIAL_ATTRIBUTES;
2051 status = (*func_NtSetInformationFile)(h, &ctx->iosb,
2052 &info, sizeof(info),
2053 FileBasicInformation);
2054 /* On FAT volumes we get STATUS_INVALID_PARAMETER if we try to set
2055 * attributes on the root directory. (Apparently because FAT doesn't
2056 * actually have a place to store those attributes!) */
2057 if (!NT_SUCCESS(status)
2058 && !(status == STATUS_INVALID_PARAMETER &&
2059 dentry_is_root(inode_first_extraction_dentry(inode))))
2061 set_errno_from_nt_status(status);
2062 ERROR_WITH_ERRNO("Can't set basic metadata on \"%ls\" "
2063 "(status=0x%08"PRIx32")",
2064 current_path(ctx), (u32)status);
2065 return WIMLIB_ERR_SET_ATTRIBUTES;
2072 apply_metadata_to_file(const struct wim_dentry *dentry,
2073 struct win32_apply_ctx *ctx)
2075 const struct wim_inode *inode = dentry->d_inode;
2081 perms = FILE_WRITE_ATTRIBUTES | WRITE_DAC |
2082 WRITE_OWNER | ACCESS_SYSTEM_SECURITY;
2084 build_extraction_path(dentry, ctx);
2086 /* Open a handle with as many relevant permissions as possible. */
2087 while (!NT_SUCCESS(status = do_create_file(&h, perms, NULL,
2088 0, FILE_OPEN, 0, ctx)))
2090 if (status == STATUS_PRIVILEGE_NOT_HELD ||
2091 status == STATUS_ACCESS_DENIED)
2093 if (perms & ACCESS_SYSTEM_SECURITY) {
2094 perms &= ~ACCESS_SYSTEM_SECURITY;
2097 if (perms & WRITE_DAC) {
2098 perms &= ~WRITE_DAC;
2101 if (perms & WRITE_OWNER) {
2102 perms &= ~WRITE_OWNER;
2106 set_errno_from_nt_status(status);
2107 ERROR_WITH_ERRNO("Can't open \"%ls\" to set metadata "
2108 "(status=0x%08"PRIx32")",
2109 current_path(ctx), (u32)status);
2110 return WIMLIB_ERR_OPEN;
2113 ret = do_apply_metadata_to_file(h, inode, ctx);
2121 apply_metadata(struct list_head *dentry_list, struct win32_apply_ctx *ctx)
2123 const struct wim_dentry *dentry;
2126 /* We go in reverse so that metadata is set on all a directory's
2127 * children before the directory itself. This avoids any potential
2128 * problems with attributes, timestamps, or security descriptors. */
2129 list_for_each_entry_reverse(dentry, dentry_list, d_extraction_list_node)
2131 ret = apply_metadata_to_file(dentry, ctx);
2134 ret = report_file_metadata_applied(&ctx->common);
2141 /* Issue warnings about problems during the extraction for which warnings were
2142 * not already issued (due to the high number of potential warnings if we issued
2143 * them per-file). */
2145 do_warnings(const struct win32_apply_ctx *ctx)
2147 if (ctx->partial_security_descriptors == 0 &&
2148 ctx->no_security_descriptors == 0 &&
2149 ctx->num_short_name_failures == 0)
2152 WARNING("Extraction to \"%ls\" complete, but with one or more warnings:",
2153 ctx->common.target);
2154 if (ctx->num_short_name_failures) {
2155 WARNING("- Could not set short names on %lu files or directories",
2156 ctx->num_short_name_failures);
2158 if (ctx->partial_security_descriptors) {
2159 WARNING("- Could only partially set the security descriptor\n"
2160 " on %lu files or directories.",
2161 ctx->partial_security_descriptors);
2163 if (ctx->no_security_descriptors) {
2164 WARNING("- Could not set security descriptor at all\n"
2165 " on %lu files or directories.",
2166 ctx->no_security_descriptors);
2168 if (ctx->partial_security_descriptors || ctx->no_security_descriptors) {
2169 WARNING("To fully restore all security descriptors, run the program\n"
2170 " with Administrator rights.");
2174 /* Extract files from a WIM image to a directory on Windows */
2176 win32_extract(struct list_head *dentry_list, struct apply_ctx *_ctx)
2179 struct win32_apply_ctx *ctx = (struct win32_apply_ctx *)_ctx;
2181 ret = prepare_target(dentry_list, ctx);
2185 if (unlikely(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_WIMBOOT)) {
2186 ret = start_wimboot_extraction(ctx);
2191 reset_file_progress(&ctx->common);
2193 ret = create_directories(dentry_list, ctx);
2197 ret = create_nondirectories(dentry_list, ctx);
2201 struct read_stream_list_callbacks cbs = {
2202 .begin_stream = begin_extract_stream,
2203 .begin_stream_ctx = ctx,
2204 .consume_chunk = extract_chunk,
2205 .consume_chunk_ctx = ctx,
2206 .end_stream = end_extract_stream,
2207 .end_stream_ctx = ctx,
2209 ret = extract_stream_list(&ctx->common, &cbs);
2213 reset_file_progress(&ctx->common);
2215 ret = apply_metadata(dentry_list, ctx);
2219 if (unlikely(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_WIMBOOT)) {
2220 ret = end_wimboot_extraction(ctx);
2228 (*func_NtClose)(ctx->h_target);
2229 if (ctx->target_ntpath.Buffer)
2230 HeapFree(GetProcessHeap(), 0, ctx->target_ntpath.Buffer);
2231 FREE(ctx->pathbuf.Buffer);
2232 FREE(ctx->print_buffer);
2233 if (ctx->wimboot.prepopulate_pats) {
2234 FREE(ctx->wimboot.prepopulate_pats->strings);
2235 FREE(ctx->wimboot.prepopulate_pats);
2237 FREE(ctx->wimboot.mem_prepopulate_pats);
2238 FREE(ctx->data_buffer);
2242 const struct apply_operations win32_apply_ops = {
2244 .get_supported_features = win32_get_supported_features,
2245 .extract = win32_extract,
2246 .context_size = sizeof(struct win32_apply_ctx),
2249 #endif /* __WIN32__ */