unsigned long no_security_descriptors;
/* Number of files for which we couldn't set the short name. */
- unsigned long num_short_name_failures;
+ unsigned long num_set_short_name_failures;
+
+ /* Number of files for which we couldn't remove the short name. */
+ unsigned long num_remove_short_name_failures;
/* Have we tried to enable short name support on the target volume yet?
*/
path_max = compute_path_max(dentry_list);
- /* Add some extra for building Win32 paths for the file encryption APIs
- * ... */
- path_max += 2 + (ctx->target_ntpath.Length / sizeof(wchar_t));
+ /* Add some extra for building Win32 paths for the file encryption APIs,
+ * and ensure we have at least enough to potentially use a 8.3 name for
+ * the last component. */
+ path_max += max(2 + (ctx->target_ntpath.Length / sizeof(wchar_t)),
+ 8 + 1 + 3);
ctx->pathbuf.MaximumLength = path_max * sizeof(wchar_t);
ctx->pathbuf.Buffer = MALLOC(ctx->pathbuf.MaximumLength);
return false;
}
+static NTSTATUS
+remove_conflicting_short_name(const struct wim_dentry *dentry, struct win32_apply_ctx *ctx)
+{
+ wchar_t *name;
+ wchar_t *end;
+ NTSTATUS status;
+ HANDLE h;
+ size_t bufsize = offsetof(FILE_NAME_INFORMATION, FileName) +
+ (13 * sizeof(wchar_t));
+ u8 buf[bufsize] _aligned_attribute(8);
+ bool retried = false;
+ FILE_NAME_INFORMATION *info = (FILE_NAME_INFORMATION *)buf;
+
+ memset(buf, 0, bufsize);
+
+ /* Build the path with the short name. */
+ name = &ctx->pathbuf.Buffer[ctx->pathbuf.Length / sizeof(wchar_t)];
+ while (name != ctx->pathbuf.Buffer && *(name - 1) != L'\\')
+ name--;
+ end = mempcpy(name, dentry->short_name, dentry->short_name_nbytes);
+ ctx->pathbuf.Length = ((u8 *)end - (u8 *)ctx->pathbuf.Buffer);
+
+ /* Open the conflicting file (by short name). */
+ status = (*func_NtOpenFile)(&h, GENERIC_WRITE | DELETE,
+ &ctx->attr, &ctx->iosb,
+ FILE_SHARE_VALID_FLAGS,
+ FILE_OPEN_REPARSE_POINT | FILE_OPEN_FOR_BACKUP_INTENT);
+ if (!NT_SUCCESS(status)) {
+ WARNING("Can't open \"%ls\" (status=0x%08"PRIx32")",
+ current_path(ctx), (u32)status);
+ goto out;
+ }
+
+#if 0
+ WARNING("Overriding conflicting short name; path=\"%ls\"",
+ current_path(ctx));
+#endif
+
+ /* Try to remove the short name on the conflicting file. */
+
+retry:
+ status = (*func_NtSetInformationFile)(h, &ctx->iosb, info, bufsize,
+ FileShortNameInformation);
+
+ if (status == STATUS_INVALID_PARAMETER && !retried) {
+
+ /* Microsoft forgot to make it possible to remove short names
+ * until Windows 7. Oops. Use a random short name instead. */
+
+ info->FileNameLength = 12 * sizeof(wchar_t);
+ for (int i = 0; i < 8; i++)
+ info->FileName[i] = 'A' + (rand() % 26);
+ info->FileName[8] = L'.';
+ info->FileName[9] = L'W';
+ info->FileName[10] = L'L';
+ info->FileName[11] = L'B';
+ info->FileName[12] = L'\0';
+ retried = true;
+ goto retry;
+ }
+ (*func_NtClose)(h);
+out:
+ build_extraction_path(dentry, ctx);
+ return status;
+}
+
/* Set the short name on the open file @h which has been created at the location
* indicated by @dentry.
*
u8 buf[bufsize] _aligned_attribute(8);
FILE_NAME_INFORMATION *info = (FILE_NAME_INFORMATION *)buf;
NTSTATUS status;
+ bool tried_to_remove_existing = false;
memset(buf, 0, bufsize);
}
}
+ /*
+ * Short names can conflict in several cases:
+ *
+ * - a file being extracted has a short name conflicting with an
+ * existing file
+ *
+ * - a file being extracted has a short name conflicting with another
+ * file being extracted (possible, but shouldn't happen)
+ *
+ * - a file being extracted has a short name that conflicts with the
+ * automatically generated short name of a file we previously
+ * extracted, but failed to set the short name for. Sounds unlikely,
+ * but this actually does happen fairly often on versions of Windows
+ * prior to Windows 7 because they do not support removing short names
+ * from files.
+ */
+ if (unlikely(status == STATUS_OBJECT_NAME_COLLISION) &&
+ dentry->short_name_nbytes && !tried_to_remove_existing)
+ {
+ tried_to_remove_existing = true;
+ status = remove_conflicting_short_name(dentry, ctx);
+ if (NT_SUCCESS(status))
+ goto retry;
+ }
+
/* By default, failure to set short names is not an error (since short
* names aren't too important anymore...). */
if (!(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_STRICT_SHORT_NAMES)) {
- ctx->num_short_name_failures++;
+ if (dentry->short_name_nbytes)
+ ctx->num_set_short_name_failures++;
+ else
+ ctx->num_remove_short_name_failures++;
return 0;
}
static void
do_warnings(const struct win32_apply_ctx *ctx)
{
- if (ctx->partial_security_descriptors == 0 &&
- ctx->no_security_descriptors == 0 &&
- ctx->num_short_name_failures == 0)
+ if (ctx->partial_security_descriptors == 0
+ && ctx->no_security_descriptors == 0
+ && ctx->num_set_short_name_failures == 0
+ #if 0
+ && ctx->num_remove_short_name_failures == 0
+ #endif
+ )
return;
WARNING("Extraction to \"%ls\" complete, but with one or more warnings:",
ctx->common.target);
- if (ctx->num_short_name_failures) {
+ if (ctx->num_set_short_name_failures) {
WARNING("- Could not set short names on %lu files or directories",
- ctx->num_short_name_failures);
+ ctx->num_set_short_name_failures);
+ }
+#if 0
+ if (ctx->num_remove_short_name_failures) {
+ WARNING("- Could not remove short names on %lu files or directories"
+ " (This is expected on Vista and earlier)",
+ ctx->num_remove_short_name_failures);
}
+#endif
if (ctx->partial_security_descriptors) {
WARNING("- Could only partially set the security descriptor\n"
" on %lu files or directories.",
git://wimlib.net / wimlib / commitdiff