/*
- * win32_common.c - Windows code common to applying and capturing images, as
- * well as replacements for various functions not available on Windows, such as
- * fsync().
+ * win32_common.c - Windows code common to applying and capturing images.
*/
/*
#ifdef __WIN32__
-#include <shlwapi.h> /* for PathMatchSpecW() */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include <errno.h>
-#include <pthread.h>
-#include "win32_common.h"
+#include "wimlib/win32_common.h"
+
+#include "wimlib/assert.h"
+#include "wimlib/error.h"
+#include "wimlib/util.h"
#ifdef ENABLE_ERROR_MESSAGES
void
}
void
-set_errno_from_GetLastError()
+set_errno_from_GetLastError(void)
{
errno = win32_error_to_errno(GetLastError());
}
-/* Replacement for POSIX fsync() */
-int
-fsync(int fd)
-{
- HANDLE h;
-
- h = (HANDLE)_get_osfhandle(fd);
- if (h == INVALID_HANDLE_VALUE)
- goto err;
- if (!FlushFileBuffers(h))
- goto err_set_errno;
- return 0;
-err_set_errno:
- set_errno_from_GetLastError();
-err:
- return -1;
-}
-
-/* Use the Win32 API to get the number of processors */
-unsigned
-win32_get_number_of_processors()
-{
- SYSTEM_INFO sysinfo;
- GetSystemInfo(&sysinfo);
- return sysinfo.dwNumberOfProcessors;
-}
-
-/* Replacement for POSIX-2008 realpath(). Warning: partial functionality only
- * (resolved_path must be NULL). Also I highly doubt that GetFullPathName
- * really does the right thing under all circumstances. */
-wchar_t *
-realpath(const wchar_t *path, wchar_t *resolved_path)
+/* Given a Windows-style path, return the number of characters of the prefix
+ * that specify the path to the root directory of a drive, or return 0 if the
+ * drive is relative (or at least on the current drive, in the case of
+ * absolute-but-not-really-absolute paths like \Windows\System32) */
+static size_t
+win32_path_drive_spec_len(const wchar_t *path)
{
- DWORD ret;
- DWORD err;
- wimlib_assert(resolved_path == NULL);
-
- ret = GetFullPathNameW(path, 0, NULL, NULL);
- if (!ret) {
- err = GetLastError();
- goto fail_win32;
- }
-
- resolved_path = TMALLOC(ret);
- if (!resolved_path)
- goto out;
- ret = GetFullPathNameW(path, ret, resolved_path, NULL);
- if (!ret) {
- err = GetLastError();
- free(resolved_path);
- resolved_path = NULL;
- goto fail_win32;
- }
- goto out;
-fail_win32:
- errno = win32_error_to_errno(err);
-out:
- return resolved_path;
-}
-
-/* rename() on Windows fails if the destination file exists. And we need to
- * make it work on wide characters. Fix it. */
-int
-win32_rename_replacement(const wchar_t *oldpath, const wchar_t *newpath)
-{
- if (MoveFileExW(oldpath, newpath, MOVEFILE_REPLACE_EXISTING)) {
- return 0;
+ size_t n = 0;
+
+ if (!wcsncmp(path, L"\\\\?\\", 4)) {
+ /* \\?\-prefixed path. Check for following drive letter and
+ * path separator. */
+ if (path[4] != L'\0' && path[5] == L':' &&
+ is_any_path_separator(path[6]))
+ n = 7;
} else {
- set_errno_from_GetLastError();
- return -1;
+ /* Not a \\?\-prefixed path. Check for an initial drive letter
+ * and path separator. */
+ if (path[0] != L'\0' && path[1] == L':' &&
+ is_any_path_separator(path[2]))
+ n = 3;
}
+ /* Include any additional path separators.*/
+ if (n > 0)
+ while (is_any_path_separator(path[n]))
+ n++;
+ return n;
}
-/* Replacement for POSIX fnmatch() (partial functionality only) */
-int
-fnmatch(const wchar_t *pattern, const wchar_t *string, int flags)
-{
- if (PathMatchSpecW(string, pattern))
- return 0;
- else
- return FNM_NOMATCH;
-}
-
-/* truncate() replacement */
-int
-win32_truncate_replacement(const wchar_t *path, off_t size)
-{
- DWORD err = NO_ERROR;
- LARGE_INTEGER liOffset;
-
- HANDLE h = win32_open_existing_file(path, GENERIC_WRITE);
- if (h == INVALID_HANDLE_VALUE)
- goto fail;
-
- liOffset.QuadPart = size;
- if (!SetFilePointerEx(h, liOffset, NULL, FILE_BEGIN))
- goto fail_close_handle;
-
- if (!SetEndOfFile(h))
- goto fail_close_handle;
- CloseHandle(h);
- return 0;
-
-fail_close_handle:
- err = GetLastError();
- CloseHandle(h);
-fail:
- if (err == NO_ERROR)
- err = GetLastError();
- errno = win32_error_to_errno(err);
- return -1;
-}
-
-
-/* This really could be replaced with _wcserror_s, but this doesn't seem to
- * actually be available in MSVCRT.DLL on Windows XP (perhaps it's statically
- * linked in by Visual Studio...?). */
-extern int
-win32_strerror_r_replacement(int errnum, wchar_t *buf, size_t buflen)
+bool
+win32_path_is_root_of_drive(const wchar_t *path)
{
- static pthread_mutex_t strerror_lock = PTHREAD_MUTEX_INITIALIZER;
+ size_t drive_spec_len;
+ wchar_t full_path[32768];
+ DWORD ret;
- pthread_mutex_lock(&strerror_lock);
- mbstowcs(buf, strerror(errnum), buflen);
- buf[buflen - 1] = '\0';
- pthread_mutex_unlock(&strerror_lock);
- return 0;
-}
+ ret = GetFullPathName(path, ARRAY_LEN(full_path), full_path, NULL);
+ if (ret > 0 && ret < ARRAY_LEN(full_path))
+ path = full_path;
-static int
-do_pread_or_pwrite(int fd, void *buf, size_t count, off_t offset,
- bool is_pwrite)
-{
- HANDLE h;
- LARGE_INTEGER orig_offset;
- DWORD bytes_read_or_written;
- LARGE_INTEGER relative_offset;
- OVERLAPPED overlapped;
- BOOL bret;
+ /* Explicit drive letter and path separator? */
+ drive_spec_len = win32_path_drive_spec_len(path);
+ if (drive_spec_len > 0 && path[drive_spec_len] == L'\0')
+ return true;
- wimlib_assert(count <= 0xffffffff);
-
- h = (HANDLE)_get_osfhandle(fd);
- if (h == INVALID_HANDLE_VALUE)
- goto err;
-
- /* Get original position */
- relative_offset.QuadPart = 0;
- if (!SetFilePointerEx(h, relative_offset, &orig_offset, FILE_CURRENT))
- goto err_set_errno;
-
- memset(&overlapped, 0, sizeof(overlapped));
- overlapped.Offset = offset;
- overlapped.OffsetHigh = offset >> 32;
-
- /* Do the read or write at the specified offset */
- if (is_pwrite)
- bret = WriteFile(h, buf, count, &bytes_read_or_written, &overlapped);
- else
- bret = ReadFile(h, buf, count, &bytes_read_or_written, &overlapped);
- if (!bret)
- goto err_set_errno;
-
- /* Restore the original position */
- if (!SetFilePointerEx(h, orig_offset, NULL, FILE_BEGIN))
- goto err_set_errno;
-
- return bytes_read_or_written;
-err_set_errno:
- set_errno_from_GetLastError();
-err:
- return -1;
+ /* All path separators? */
+ for (const wchar_t *p = path; *p != L'\0'; p++)
+ if (!is_any_path_separator(*p))
+ return false;
+ return true;
}
-/* Dumb Windows implementation of pread(). It temporarily changes the file
- * offset, so it is not safe to use with readers/writers on the same file
- * descriptor. */
-extern ssize_t
-win32_pread(int fd, void *buf, size_t count, off_t offset)
-{
- return do_pread_or_pwrite(fd, buf, count, offset, false);
-}
-
-/* Dumb Windows implementation of pwrite(). It temporarily changes the file
- * offset, so it is not safe to use with readers/writers on the same file
- * descriptor. */
-extern ssize_t
-win32_pwrite(int fd, const void *buf, size_t count, off_t offset)
-{
- return do_pread_or_pwrite(fd, (void*)buf, count, offset, true);
-}
-
-/* Dumb Windows implementation of writev(). It writes the vectors one at a
- * time. */
-extern ssize_t
-win32_writev(int fd, const struct iovec *iov, int iovcnt)
-{
- ssize_t total_bytes_written = 0;
-
- if (iovcnt <= 0) {
- errno = EINVAL;
- return -1;
- }
- for (int i = 0; i < iovcnt; i++) {
- ssize_t bytes_written;
-
- bytes_written = write(fd, iov[i].iov_base, iov[i].iov_len);
- if (bytes_written >= 0)
- total_bytes_written += bytes_written;
- if (bytes_written != iov[i].iov_len) {
- if (total_bytes_written == 0)
- total_bytes_written = -1;
- break;
- }
- }
- return total_bytes_written;
-}
/* Given a path, which may not yet exist, get a set of flags that describe the
* features of the volume the path is on. */
int
-win32_get_vol_flags(const wchar_t *path, unsigned *vol_flags_ret)
+win32_get_vol_flags(const wchar_t *path, unsigned *vol_flags_ret,
+ bool *supports_SetFileShortName_ret)
{
wchar_t *volume;
BOOL bret;
DWORD vol_flags;
+ size_t drive_spec_len;
+ wchar_t filesystem_name[MAX_PATH + 1];
- if (path[0] != L'\0' && path[0] != L'\\' &&
- path[0] != L'/' && path[1] == L':')
- {
- /* Path starts with a drive letter; use it. */
- volume = alloca(4 * sizeof(wchar_t));
- volume[0] = path[0];
- volume[1] = path[1];
- volume[2] = L'\\';
- volume[3] = L'\0';
- } else {
+ if (supports_SetFileShortName_ret)
+ *supports_SetFileShortName_ret = false;
+
+ drive_spec_len = win32_path_drive_spec_len(path);
+
+ if (drive_spec_len == 0)
+ if (path[0] != L'\0' && path[1] == L':') /* Drive-relative path? */
+ drive_spec_len = 2;
+
+ if (drive_spec_len == 0) {
/* Path does not start with a drive letter; use the volume of
* the current working directory. */
volume = NULL;
+ } else {
+ /* Path starts with a drive letter (or \\?\ followed by a drive
+ * letter); use it. */
+ volume = alloca((drive_spec_len + 2) * sizeof(wchar_t));
+ wmemcpy(volume, path, drive_spec_len);
+ /* Add trailing backslash in case this was a drive-relative
+ * path. */
+ volume[drive_spec_len] = L'\\';
+ volume[drive_spec_len + 1] = L'\0';
}
- bret = GetVolumeInformationW(volume, /* lpRootPathName */
- NULL, /* lpVolumeNameBuffer */
- 0, /* nVolumeNameSize */
- NULL, /* lpVolumeSerialNumber */
- NULL, /* lpMaximumComponentLength */
- &vol_flags, /* lpFileSystemFlags */
- NULL, /* lpFileSystemNameBuffer */
- 0); /* nFileSystemNameSize */
+ bret = GetVolumeInformation(
+ volume, /* lpRootPathName */
+ NULL, /* lpVolumeNameBuffer */
+ 0, /* nVolumeNameSize */
+ NULL, /* lpVolumeSerialNumber */
+ NULL, /* lpMaximumComponentLength */
+ &vol_flags, /* lpFileSystemFlags */
+ filesystem_name, /* lpFileSystemNameBuffer */
+ ARRAY_LEN(filesystem_name)); /* nFileSystemNameSize */
if (!bret) {
DWORD err = GetLastError();
WARNING("Failed to get volume information for path \"%ls\"", path);
win32_error(err);
vol_flags = 0xffffffff;
+ goto out;
}
+ if (wcsstr(filesystem_name, L"NTFS")) {
+ /* FILE_SUPPORTS_HARD_LINKS is only supported on Windows 7 and later.
+ * Force it on anyway if filesystem is NTFS. */
+ vol_flags |= FILE_SUPPORTS_HARD_LINKS;
+
+ if (supports_SetFileShortName_ret)
+ *supports_SetFileShortName_ret = true;
+ }
+
+out:
DEBUG("using vol_flags = %x", vol_flags);
*vol_flags_ret = vol_flags;
return 0;
}
+static bool
+win32_modify_privilege(const wchar_t *privilege, bool enable)
+{
+ HANDLE hToken;
+ LUID luid;
+ TOKEN_PRIVILEGES newState;
+ bool ret = FALSE;
+
+ if (!OpenProcessToken(GetCurrentProcess(),
+ TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
+ &hToken))
+ goto out;
+
+ if (!LookupPrivilegeValue(NULL, privilege, &luid))
+ goto out_close_handle;
+
+ newState.PrivilegeCount = 1;
+ newState.Privileges[0].Luid = luid;
+ newState.Privileges[0].Attributes = (enable ? SE_PRIVILEGE_ENABLED : 0);
+ SetLastError(ERROR_SUCCESS);
+ ret = AdjustTokenPrivileges(hToken, FALSE, &newState, 0, NULL, NULL);
+ if (ret && GetLastError() == ERROR_NOT_ALL_ASSIGNED)
+ ret = FALSE;
+out_close_handle:
+ CloseHandle(hToken);
+out:
+ return ret;
+}
+
+static bool
+win32_modify_capture_privileges(bool enable)
+{
+ return win32_modify_privilege(SE_BACKUP_NAME, enable)
+ && win32_modify_privilege(SE_SECURITY_NAME, enable);
+}
+
+static bool
+win32_modify_apply_privileges(bool enable)
+{
+ return win32_modify_privilege(SE_RESTORE_NAME, enable)
+ && win32_modify_privilege(SE_SECURITY_NAME, enable)
+ && win32_modify_privilege(SE_TAKE_OWNERSHIP_NAME, enable);
+}
+
+static void
+win32_release_capture_and_apply_privileges(void)
+{
+ win32_modify_capture_privileges(false);
+ win32_modify_apply_privileges(false);
+}
+
HANDLE
win32_open_existing_file(const wchar_t *path, DWORD dwDesiredAccess)
{
return win32_open_existing_file(path, FILE_READ_DATA);
}
+#ifndef WITH_NTDLL
/* Pointers to functions that are not available on all targetted versions of
* Windows (XP and later). NOTE: The WINAPI annotations seem to be important; I
* assume it specifies a certain calling convention. */
/* Vista and later */
BOOL (WINAPI *win32func_FindNextStreamW)(HANDLE hFindStream,
LPVOID lpFindStreamData) = NULL;
+#endif /* !WITH_NTDLL */
+
+/* Vista and later */
+BOOL (WINAPI *win32func_CreateSymbolicLinkW)(const wchar_t *lpSymlinkFileName,
+ const wchar_t *lpTargetFileName,
+ DWORD dwFlags) = NULL;
static OSVERSIONINFO windows_version_info = {
.dwOSVersionInfoSize = sizeof(OSVERSIONINFO),
static HMODULE hKernel32 = NULL;
+static bool acquired_privileges = false;
+
bool
windows_version_is_at_least(unsigned major, unsigned minor)
{
windows_version_info.dwMinorVersion >= minor);
}
-/* Try to dynamically load some functions */
-void
-win32_global_init()
+/* One-time initialization for Windows capture/apply code. */
+int
+win32_global_init(int init_flags)
{
- DWORD err;
-
- if (hKernel32 == NULL) {
- DEBUG("Loading Kernel32.dll");
- hKernel32 = LoadLibraryW(L"Kernel32.dll");
- if (hKernel32 == NULL) {
- err = GetLastError();
- WARNING("Can't load Kernel32.dll");
- win32_error(err);
- }
+ /* Try to acquire useful privileges. */
+ if (!(init_flags & WIMLIB_INIT_FLAG_DONT_ACQUIRE_PRIVILEGES)) {
+ if (!win32_modify_capture_privileges(true))
+ if (init_flags & WIMLIB_INIT_FLAG_STRICT_CAPTURE_PRIVILEGES)
+ goto insufficient_privileges;
+ if (!win32_modify_apply_privileges(true))
+ if (init_flags & WIMLIB_INIT_FLAG_STRICT_APPLY_PRIVILEGES)
+ goto insufficient_privileges;
+ acquired_privileges = true;
}
+ /* Get Windows version information. */
+ GetVersionEx(&windows_version_info);
+
+ /* Try to dynamically load some functions. */
+ if (hKernel32 == NULL)
+ hKernel32 = LoadLibrary(L"Kernel32.dll");
+
if (hKernel32) {
+ #ifndef WITH_NTDLL
win32func_FindFirstStreamW = (void*)GetProcAddress(hKernel32,
"FindFirstStreamW");
if (win32func_FindFirstStreamW) {
if (!win32func_FindNextStreamW)
win32func_FindFirstStreamW = NULL;
}
+ #endif /* !WITH_NTDLL */
+ win32func_CreateSymbolicLinkW = (void*)GetProcAddress(hKernel32,
+ "CreateSymbolicLinkW");
}
+ return 0;
- GetVersionEx(&windows_version_info);
+insufficient_privileges:
+ win32_release_capture_and_apply_privileges();
+ return WIMLIB_ERR_INSUFFICIENT_PRIVILEGES;
}
void
-win32_global_cleanup()
+win32_global_cleanup(void)
{
+ if (acquired_privileges)
+ win32_release_capture_and_apply_privileges();
if (hKernel32 != NULL) {
- DEBUG("Closing Kernel32.dll");
FreeLibrary(hKernel32);
hKernel32 = NULL;
}
git://wimlib.net / wimlib / blobdiff