* extract_image.c
*
* Support for extracting WIM files.
- *
- * This code does NOT contain any filesystem-specific features. In particular,
- * security information (i.e. file permissions) and alternate data streams are
- * ignored, except possibly to read an alternate data stream that contains
- * symbolic link data.
*/
/*
#include "config.h"
-#include <dirent.h>
+#if defined(__CYGWIN__) || defined(__WIN32__)
+# include <windows.h>
+# ifdef ERROR
+# undef ERROR
+# endif
+# include <wchar.h>
+#else
+# include <dirent.h>
+# ifdef HAVE_UTIME_H
+# include <utime.h>
+# endif
+# include "timestamp.h"
+# include <sys/time.h>
+#endif
+
#include <errno.h>
#include <fcntl.h>
+#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
-#include <stdlib.h>
-#include <sys/time.h>
-
-#ifdef HAVE_UTIME_H
-#include <utime.h>
-#endif
#include <unistd.h>
#include "dentry.h"
#include "lookup_table.h"
-#include "timestamp.h"
#include "wimlib_internal.h"
#include "xml.h"
#include <ntfs-3g/volume.h>
#endif
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+
+#if defined(__WIN32__)
+# define swprintf _snwprintf
+# define mkdir(path, mode) (!CreateDirectoryA(path, NULL))
+#endif
+
+#if defined(__CYGWIN__) || defined(__WIN32__)
+
+static int win32_set_reparse_data(HANDLE h,
+ u32 reparse_tag,
+ const struct wim_lookup_table_entry *lte,
+ const wchar_t *path)
+{
+ int ret;
+ u8 *buf;
+ size_t len;
+
+ if (!lte) {
+ WARNING("\"%ls\" is marked as a reparse point but had no reparse data",
+ path);
+ return 0;
+ }
+ len = wim_resource_size(lte);
+ if (len > 16 * 1024 - 8) {
+ WARNING("\"%ls\": reparse data too long!", path);
+ return 0;
+ }
+
+ /* The WIM stream omits the ReparseTag and ReparseDataLength fields, so
+ * leave 8 bytes of space for them at the beginning of the buffer, then
+ * set them manually. */
+ buf = alloca(len + 8);
+ ret = read_full_wim_resource(lte, buf + 8, 0);
+ if (ret)
+ return ret;
+ *(u32*)(buf + 0) = reparse_tag;
+ *(u16*)(buf + 4) = len;
+ *(u16*)(buf + 6) = 0;
+
+ /* Set the reparse data on the open file using the
+ * FSCTL_SET_REPARSE_POINT ioctl.
+ *
+ * There are contradictions in Microsoft's documentation for this:
+ *
+ * "If hDevice was opened without specifying FILE_FLAG_OVERLAPPED,
+ * lpOverlapped is ignored."
+ *
+ * --- So setting lpOverlapped to NULL is okay since it's ignored.
+ *
+ * "If lpOverlapped is NULL, lpBytesReturned cannot be NULL. Even when an
+ * operation returns no output data and lpOutBuffer is NULL,
+ * DeviceIoControl makes use of lpBytesReturned. After such an
+ * operation, the value of lpBytesReturned is meaningless."
+ *
+ * --- So lpOverlapped not really ignored, as it affects another
+ * parameter. This is the actual behavior: lpBytesReturned must be
+ * specified, even though lpBytesReturned is documented as:
+ *
+ * "Not used with this operation; set to NULL."
+ */
+ DWORD bytesReturned;
+ if (!DeviceIoControl(h, FSCTL_SET_REPARSE_POINT, buf, len + 8,
+ NULL, 0,
+ &bytesReturned /* lpBytesReturned */,
+ NULL /* lpOverlapped */))
+ {
+ DWORD err = GetLastError();
+ ERROR("Failed to set reparse data on \"%ls\"", path);
+ win32_error(err);
+ return WIMLIB_ERR_WRITE;
+ }
+ return 0;
+}
+
+
+static int win32_extract_chunk(const u8 *buf, size_t len, u64 offset, void *arg)
+{
+ HANDLE hStream = arg;
+
+ DWORD nbytes_written;
+ wimlib_assert(len <= 0xffffffff);
+
+ if (!WriteFile(hStream, buf, len, &nbytes_written, NULL) ||
+ nbytes_written != len)
+ {
+ DWORD err = GetLastError();
+ ERROR("WriteFile(): write error");
+ win32_error(err);
+ return WIMLIB_ERR_WRITE;
+ }
+ return 0;
+}
+
+static int do_win32_extract_stream(HANDLE hStream, struct wim_lookup_table_entry *lte)
+{
+ return extract_wim_resource(lte, wim_resource_size(lte),
+ win32_extract_chunk, hStream);
+}
+
+static int win32_extract_stream(const struct wim_inode *inode,
+ const wchar_t *path,
+ const wchar_t *stream_name_utf16,
+ struct wim_lookup_table_entry *lte)
+{
+ wchar_t *stream_path;
+ HANDLE h;
+ int ret;
+ DWORD err;
+ DWORD creationDisposition = CREATE_ALWAYS;
+
+ if (stream_name_utf16) {
+ /* Named stream. Create a buffer that contains the UTF-16LE
+ * string [./]@path:@stream_name_utf16. This is needed to
+ * create and open the stream using CreateFileW(). I'm not
+ * aware of any other APIs to do this. Note: the '$DATA' suffix
+ * seems to be unneeded. Additional note: a "./" prefix needs
+ * to be added when the path is not absolute to avoid ambiguity
+ * with drive letters. */
+ size_t stream_path_nchars;
+ size_t path_nchars;
+ size_t stream_name_nchars;
+ const wchar_t *prefix;
+
+ path_nchars = wcslen(path);
+ stream_name_nchars = wcslen(stream_name_utf16);
+ stream_path_nchars = path_nchars + 1 + stream_name_nchars;
+ if (path[0] != L'/' && path[0] != L'\\') {
+ prefix = L"./";
+ stream_path_nchars += 2;
+ } else {
+ prefix = L"";
+ }
+ stream_path = alloca((stream_path_nchars + 1) * sizeof(wchar_t));
+ swprintf(stream_path, stream_path_nchars + 1, L"%ls%ls:%ls",
+ prefix, path, stream_name_utf16);
+ } else {
+ /* Unnamed stream; its path is just the path to the file itself.
+ * */
+ stream_path = (wchar_t*)path;
+
+ /* Directories must be created with CreateDirectoryW(). Then
+ * the call to CreateFileW() will merely open the directory that
+ * was already created rather than creating a new file. */
+ if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
+ if (!CreateDirectoryW(stream_path, NULL)) {
+ err = GetLastError();
+ if (err != ERROR_ALREADY_EXISTS) {
+ ERROR("Failed to create directory \"%ls\"",
+ stream_path);
+ win32_error(err);
+ ret = WIMLIB_ERR_MKDIR;
+ goto fail;
+ }
+ }
+ DEBUG("Created directory \"%ls\"", stream_path);
+ if (!(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
+ ret = 0;
+ goto out;
+ }
+ creationDisposition = OPEN_EXISTING;
+ }
+ }
+
+ DEBUG("Opening \"%ls\"", stream_path);
+ h = CreateFileW(stream_path,
+ GENERIC_WRITE | WRITE_OWNER | WRITE_DAC | ACCESS_SYSTEM_SECURITY,
+ 0,
+ NULL,
+ creationDisposition,
+ FILE_FLAG_OPEN_REPARSE_POINT |
+ FILE_FLAG_BACKUP_SEMANTICS |
+ inode->i_attributes,
+ NULL);
+ if (h == INVALID_HANDLE_VALUE) {
+ err = GetLastError();
+ ERROR("Failed to create \"%ls\"", stream_path);
+ win32_error(err);
+ ret = WIMLIB_ERR_OPEN;
+ goto fail;
+ }
+
+ if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT &&
+ stream_name_utf16 == NULL)
+ {
+ DEBUG("Setting reparse data on \"%ls\"", path);
+ ret = win32_set_reparse_data(h, inode->i_reparse_tag, lte, path);
+ if (ret)
+ goto fail_close_handle;
+ } else {
+ if (lte) {
+ DEBUG("Extracting \"%ls\" (len = %"PRIu64")",
+ stream_path, wim_resource_size(lte));
+ ret = do_win32_extract_stream(h, lte);
+ if (ret)
+ goto fail_close_handle;
+ }
+ }
+
+ DEBUG("Closing \"%ls\"", stream_path);
+ if (!CloseHandle(h)) {
+ err = GetLastError();
+ ERROR("Failed to close \"%ls\"", stream_path);
+ win32_error(err);
+ ret = WIMLIB_ERR_WRITE;
+ goto fail;
+ }
+ ret = 0;
+ goto out;
+fail_close_handle:
+ CloseHandle(h);
+fail:
+ ERROR("Error extracting %ls", stream_path);
+out:
+ return ret;
+}
+
+/*
+ * Creates a file, directory, or reparse point and extracts all streams to it
+ * (unnamed data stream and/or reparse point stream, plus any alternate data
+ * streams). This in Win32-specific code.
+ *
+ * @inode: WIM inode for this file or directory.
+ * @path: UTF-16LE external path to extract the inode to.
+ *
+ * Returns 0 on success; nonzero on failure.
+ */
+static int win32_extract_streams(struct wim_inode *inode,
+ const wchar_t *path, u64 *completed_bytes_p)
+{
+ struct wim_lookup_table_entry *unnamed_lte;
+ int ret;
+
+ unnamed_lte = inode_unnamed_lte_resolved(inode);
+ ret = win32_extract_stream(inode, path, NULL, unnamed_lte);
+ if (ret)
+ goto out;
+ if (unnamed_lte)
+ *completed_bytes_p += wim_resource_size(unnamed_lte);
+ for (u16 i = 0; i < inode->i_num_ads; i++) {
+ const struct wim_ads_entry *ads_entry = &inode->i_ads_entries[i];
+ if (ads_entry->stream_name_len != 0) {
+ /* Skip special UNIX data entries (see documentation for
+ * WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) */
+ if (ads_entry->stream_name_len == WIMLIB_UNIX_DATA_TAG_LEN
+ && !memcmp(ads_entry->stream_name_utf8,
+ WIMLIB_UNIX_DATA_TAG,
+ WIMLIB_UNIX_DATA_TAG_LEN))
+ continue;
+ ret = win32_extract_stream(inode,
+ path,
+ (const wchar_t*)ads_entry->stream_name,
+ ads_entry->lte);
+ if (ret)
+ break;
+ if (ads_entry->lte)
+ *completed_bytes_p += wim_resource_size(ads_entry->lte);
+ }
+ }
+out:
+ return ret;
+}
+
+/*
+ * Sets the security descriptor on an extracted file. This is Win32-specific
+ * code.
+ *
+ * @inode: The WIM inode that was extracted and has a security descriptor.
+ * @path: UTF-16LE external path that the inode was extracted to.
+ * @sd: Security data for the WIM image.
+ *
+ * Returns 0 on success; nonzero on failure.
+ */
+static int win32_set_security_data(const struct wim_inode *inode,
+ const wchar_t *path,
+ const struct wim_security_data *sd)
+{
+ SECURITY_INFORMATION securityInformation = DACL_SECURITY_INFORMATION |
+ SACL_SECURITY_INFORMATION |
+ OWNER_SECURITY_INFORMATION |
+ GROUP_SECURITY_INFORMATION;
+ if (!SetFileSecurityW(path, securityInformation,
+ (PSECURITY_DESCRIPTOR)sd->descriptors[inode->i_security_id]))
+ {
+ DWORD err = GetLastError();
+ ERROR("Can't set security descriptor on \"%ls\"", path);
+ win32_error(err);
+ return WIMLIB_ERR_WRITE;
+ }
+ return 0;
+}
+
+#else /* __CYGWIN__ || __WIN32__ */
static int extract_regular_file_linked(struct wim_dentry *dentry,
const char *output_path,
struct apply_args *args,
return 0;
}
+#endif /* !(__CYGWIN__ || __WIN32__) */
+
static int extract_directory(struct wim_dentry *dentry,
const char *output_path, bool is_root)
{
return WIMLIB_ERR_MKDIR;
}
dir_exists:
+ ret = 0;
+#if !defined(__CYGWIN__) && !defined(__WIN32__)
if (dentry) {
struct wimlib_unix_data unix_data;
ret = inode_get_unix_data(dentry->d_inode, &unix_data, NULL);
ret = 0;
else
ret = dir_apply_unix_data(output_path, &unix_data);
- } else {
- ret = 0;
}
+#endif
return ret;
}
struct apply_args *args = arg;
struct wim_inode *inode = dentry->d_inode;
size_t len;
+ char *output_path;
len = strlen(args->target);
- char output_path[len + dentry->full_path_utf8_len + 1];
- memcpy(output_path, args->target, len);
- memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
- output_path[len + dentry->full_path_utf8_len] = '\0';
+ if (dentry_is_root(dentry)) {
+ output_path = (char*)args->target;
+ } else {
+ output_path = alloca(len + dentry->full_path_utf8_len + 1);
+ memcpy(output_path, args->target, len);
+ memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
+ output_path[len + dentry->full_path_utf8_len] = '\0';
+ len += dentry->full_path_utf8_len;
+ }
+#if defined(__CYGWIN__) || defined(__WIN32__)
+ char *utf16_path;
+ size_t utf16_path_len;
+ DWORD err;
+ int ret;
+ ret = utf8_to_utf16(output_path, len, &utf16_path, &utf16_path_len);
+ if (ret)
+ return ret;
+
+ if (inode->i_nlink > 1 && inode->i_extracted_file != NULL) {
+ /* Linked file, with another name already extracted. Create a
+ * hard link. */
+ DEBUG("Creating hard link \"%ls => %ls\"",
+ (const wchar_t*)utf16_path,
+ (const wchar_t*)inode->i_extracted_file);
+ if (!CreateHardLinkW((const wchar_t*)utf16_path,
+ (const wchar_t*)inode->i_extracted_file,
+ NULL))
+ {
+ err = GetLastError();
+ ERROR("Can't create hard link \"%ls => %ls\"",
+ (const wchar_t*)utf16_path,
+ (const wchar_t*)inode->i_extracted_file);
+ ret = WIMLIB_ERR_LINK;
+ win32_error(err);
+ }
+ } else {
+ /* Create the file, directory, or reparse point, and extract the
+ * data streams. */
+ ret = win32_extract_streams(inode, (const wchar_t*)utf16_path,
+ &args->progress.extract.completed_bytes);
+ if (ret)
+ goto out_free_utf16_path;
+
+ /* Set security descriptor if present */
+ if (inode->i_security_id != -1) {
+ DEBUG("Setting security descriptor %d on %s",
+ inode->i_security_id, output_path);
+ ret = win32_set_security_data(inode,
+ (const wchar_t*)utf16_path,
+ wim_const_security_data(args->w));
+ if (ret)
+ goto out_free_utf16_path;
+ }
+ if (inode->i_nlink > 1) {
+ /* Save extracted path for a later call to
+ * CreateHardLinkW() if this inode has multiple links.
+ * */
+ inode->i_extracted_file = utf16_path;
+ goto out;
+ }
+ }
+out_free_utf16_path:
+ FREE(utf16_path);
+out:
+ return ret;
+#else
if (inode_is_symlink(inode))
return extract_symlink(dentry, args, output_path);
else if (inode_is_directory(inode))
output_path, false);
else
return extract_regular_file(dentry, args, output_path);
+#endif
}
/* Apply timestamps to an extracted file or directory */
static int apply_dentry_timestamps_normal(struct wim_dentry *dentry, void *arg)
{
struct apply_args *args = arg;
- size_t len = strlen(args->target);
- char output_path[len + dentry->full_path_utf8_len + 1];
- const struct wim_inode *inode = dentry->d_inode;
+ size_t len;
+ char *output_path;
int ret;
+ const struct wim_inode *inode = dentry->d_inode;
+
+ len = strlen(args->target);
+ if (dentry_is_root(dentry)) {
+ output_path = (char*)args->target;
+ } else {
+ output_path = alloca(len + dentry->full_path_utf8_len + 1);
+ memcpy(output_path, args->target, len);
+ memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
+ output_path[len + dentry->full_path_utf8_len] = '\0';
+ len += dentry->full_path_utf8_len;
+ }
- memcpy(output_path, args->target, len);
- memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
- output_path[len + dentry->full_path_utf8_len] = '\0';
+#if defined(__CYGWIN__) || defined(__WIN32__)
+ /* Win32 */
+ char *utf16_path;
+ size_t utf16_path_len;
+ DWORD err;
+ HANDLE h;
+
+ ret = utf8_to_utf16(output_path, len, &utf16_path, &utf16_path_len);
+ if (ret)
+ return ret;
+
+ DEBUG("Opening \"%s\" to set timestamps", output_path);
+ h = CreateFileW((const wchar_t*)utf16_path,
+ GENERIC_WRITE | WRITE_OWNER | WRITE_DAC | ACCESS_SYSTEM_SECURITY,
+ FILE_SHARE_READ,
+ NULL,
+ OPEN_EXISTING,
+ FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
+ NULL);
+
+ if (h == INVALID_HANDLE_VALUE)
+ err = GetLastError();
+ FREE(utf16_path);
+ if (h == INVALID_HANDLE_VALUE)
+ goto fail;
+
+ FILETIME creationTime = {.dwLowDateTime = inode->i_creation_time & 0xffffffff,
+ .dwHighDateTime = inode->i_creation_time >> 32};
+ FILETIME lastAccessTime = {.dwLowDateTime = inode->i_last_access_time & 0xffffffff,
+ .dwHighDateTime = inode->i_last_access_time >> 32};
+ FILETIME lastWriteTime = {.dwLowDateTime = inode->i_last_write_time & 0xffffffff,
+ .dwHighDateTime = inode->i_last_write_time >> 32};
+
+ DEBUG("Calling SetFileTime() on \"%s\"", output_path);
+ if (!SetFileTime(h, &creationTime, &lastAccessTime, &lastWriteTime)) {
+ err = GetLastError();
+ CloseHandle(h);
+ goto fail;
+ }
+ DEBUG("Closing \"%s\"", output_path);
+ if (!CloseHandle(h)) {
+ err = GetLastError();
+ goto fail;
+ }
+ goto out;
+fail:
+ /* Only warn if setting timestamps failed. */
+ WARNING("Can't set timestamps on \"%s\"", output_path);
+ win32_error(err);
+out:
+ return 0;
+#else
+ /* UNIX */
/* Convert the WIM timestamps, which are accurate to 100 nanoseconds,
* into struct timeval's. */
}
}
return 0;
+#endif
}
/* Extract a dentry if it hasn't already been extracted, and either the dentry
== (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
return WIMLIB_ERR_INVALID_PARAM;
+#if defined(__CYGWIN__) || defined(__WIN32__)
+ if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
+ ERROR("Extracting UNIX data is not supported on Windows");
+ return WIMLIB_ERR_INVALID_PARAM;
+ }
+ if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) {
+ ERROR("Linked extraction modes are not supported on Windows");
+ return WIMLIB_ERR_INVALID_PARAM;
+ }
+#endif
+
if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
#ifdef WITH_NTFS_3G
if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))) {
w->lookup_table = joined_tab;
}
+#if defined(__CYGWIN__) || defined(__WIN32__)
+ win32_acquire_privilege(SE_RESTORE_NAME);
+ win32_acquire_privilege(SE_SECURITY_NAME);
+ win32_acquire_privilege(SE_TAKE_OWNERSHIP_NAME);
+#endif
if (image == WIMLIB_ALL_IMAGES) {
extract_flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
ret = extract_all_images(w, target, extract_flags,
ret = extract_single_image(w, image, target, extract_flags,
progress_func);
}
+#if defined(__CYGWIN__) || defined(__WIN32__)
+ win32_release_privilege(SE_RESTORE_NAME);
+ win32_release_privilege(SE_SECURITY_NAME);
+ win32_release_privilege(SE_TAKE_OWNERSHIP_NAME);
+#endif
if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
WIMLIB_EXTRACT_FLAG_HARDLINK))
git://wimlib.net / wimlib / blobdiff