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diff --git a/source3/lib/tdb_validate.h b/source3/lib/tdb_validate.h
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+++ b/source3/lib/tdb_validate.h
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+/*
+ * Unix SMB/CIFS implementation.
+ *
+ * A general tdb content validation mechanism
+ *
+ * Copyright (C) Michael Adam      2007
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TDB_VALIDATE_H__
+#define __TDB_VALIDATE_H__
+
+#include "lib/replace/replace.h"
+#include <tdb.h>
+
+/**
+ * Flag field for keeping track of the status of a validation.
+ */
+struct tdb_validation_status {
+	bool tdb_error;
+	bool bad_freelist;
+	bool bad_entry;
+	bool unknown_key;
+	bool success;
+};
+
+/**
+ * Callback function type for the validation mechanism.
+ */
+typedef int (*tdb_validate_data_func)(TDB_CONTEXT *the_tdb, TDB_DATA kbuf,
+				      TDB_DATA dbuf, void *state);
+
+/**
+ * tdb validation function.
+ * returns 0 if tdb is ok, != 0 if it isn't.
+ * this function expects an opened tdb.
+ */
+int tdb_validate(struct tdb_context *tdb,
+		 tdb_validate_data_func validate_fn);
+
+/**
+ * tdb validation function.
+ * returns 0 if tdb is ok, != 0 if it isn't.
+ * This is a wrapper around the actual validation function that
+ * opens and closes the tdb.
+ */
+int tdb_validate_open(const char *tdb_path,
+		      tdb_validate_data_func validate_fn);
+
+/**
+ * validation function with backup handling:
+ *
+ *  - calls tdb_validate
+ *  - if the tdb is ok, create a backup "name.bak", possibly moving
+ *    existing backup to name.bak.old,
+ *    return 0 (success) even if the backup fails
+ *  - if the tdb is corrupt:
+ *    - move the tdb to "name.corrupt"
+ *    - check if there is valid backup.
+ *      if so, restore the backup.
+ *      if restore is successful, return 0 (success),
+ *    - otherwise return -1 (failure)
+ */
+int tdb_validate_and_backup(const char *tdb_path,
+			    tdb_validate_data_func validate_fn);
+
+#endif /* __TDB_VALIDATE_H__ */