int ldb_kv_search_base(struct ldb_module *module,
		       TALLOC_CTX *mem_ctx,
		       struct ldb_dn *dn,
		       struct ldb_dn **ret_dn)
{
	int exists;
	int ret;
	struct ldb_message *msg = NULL;

	if (ldb_dn_is_null(dn)) {
		return LDB_ERR_NO_SUCH_OBJECT;
	}

	/*
	 * We can't use tdb_exists() directly on a key when the TDB
	 * key is the GUID one, not the DN based one.  So we just do a
	 * normal search and avoid most of the allocation with the
	 * LDB_UNPACK_DATA_FLAG_NO_ATTRS flag
	 */
	msg = ldb_msg_new(module);
	if (msg == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ret = ldb_kv_search_dn1(module, dn, msg, LDB_UNPACK_DATA_FLAG_NO_ATTRS);
	if (ret == LDB_SUCCESS) {
		const char *dn_linearized
			= ldb_dn_get_linearized(dn);
		const char *msg_dn_linearized
			= ldb_dn_get_linearized(msg->dn);

		if (strcmp(dn_linearized, msg_dn_linearized) == 0) {
			/*
			 * Re-use the full incoming DN for
			 * subtree checks
			 */
			*ret_dn = dn;
		} else {
			/*
			 * Use the string DN from the unpack, so that
			 * we have a case-exact match of the base
			 */
			*ret_dn = talloc_steal(mem_ctx, msg->dn);
		}
		exists = true;
	} else if (ret == LDB_ERR_NO_SUCH_OBJECT) {
		exists = false;
	} else {
		talloc_free(msg);
		return ret;
	}
	talloc_free(msg);
	if (exists) {
		return LDB_SUCCESS;
	}
	return LDB_ERR_NO_SUCH_OBJECT;
}
int ldb_kv_search_base(struct ldb_module *module,
		       TALLOC_CTX *mem_ctx,
		       struct ldb_dn *dn,
		       struct ldb_dn **ret_dn)
{
	int exists;
	int ret;
	struct ldb_message *msg = NULL;

	if (ldb_dn_is_null(dn)) {
		return LDB_ERR_NO_SUCH_OBJECT;
	}

	 
	msg = ldb_msg_new(module);
	if (msg == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ret = ldb_kv_search_dn1(module, dn, msg, LDB_UNPACK_DATA_FLAG_NO_ATTRS);
	if (ret == LDB_SUCCESS) {
		const char *dn_linearized
			= ldb_dn_get_linearized(dn);
		const char *msg_dn_linearized
			= ldb_dn_get_linearized(msg->dn);

		if (strcmp(dn_linearized, msg_dn_linearized) == 0) {
			 
			*ret_dn = dn;
		} else {
			 
			*ret_dn = talloc_steal(mem_ctx, msg->dn);
		}
		exists = true;
	} else if (ret == LDB_ERR_NO_SUCH_OBJECT) {
		exists = false;
	} else {
		talloc_free(msg);
		return ret;
	}
	talloc_free(msg);
	if (exists) {
		return LDB_SUCCESS;
	}
	return LDB_ERR_NO_SUCH_OBJECT;
}