--- /dev/null
+/*
+ ldb database library
+
+ Copyright (C) Simo Sorce 2004-2006
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+ Copyright (C) Andrew Tridgell 2005
+ Copyright (C) Stefan Metzmacher 2007
+
+ ** NOTE! The following LGPL license applies to the ldb
+ ** library. This does NOT imply that all of Samba is released
+ ** under the LGPL
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+/*
+ * Name: ldb
+ *
+ * Component: ldb repl_meta_data module
+ *
+ * Description: - add a unique objectGUID onto every new record,
+ * - handle whenCreated, whenChanged timestamps
+ * - handle uSNCreated, uSNChanged numbers
+ * - handle replPropertyMetaData attribute
+ *
+ * Author: Simo Sorce
+ * Author: Stefan Metzmacher
+ */
+
+#include "includes.h"
+#include "ldb/include/includes.h"
+#include "librpc/gen_ndr/ndr_misc.h"
+
+static struct ldb_message_element *replmd_find_attribute(const struct ldb_message *msg, const char *name)
+{
+ int i;
+
+ for (i = 0; i < msg->num_elements; i++) {
+ if (ldb_attr_cmp(name, msg->elements[i].name) == 0) {
+ return &msg->elements[i];
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ add a time element to a record
+*/
+static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
+{
+ struct ldb_message_element *el;
+ char *s;
+
+ if (ldb_msg_find_element(msg, attr) != NULL) {
+ return 0;
+ }
+
+ s = ldb_timestring(msg, t);
+ if (s == NULL) {
+ return -1;
+ }
+
+ if (ldb_msg_add_string(msg, attr, s) != 0) {
+ return -1;
+ }
+
+ el = ldb_msg_find_element(msg, attr);
+ /* always set as replace. This works because on add ops, the flag
+ is ignored */
+ el->flags = LDB_FLAG_MOD_REPLACE;
+
+ return 0;
+}
+
+/*
+ add a uint64_t element to a record
+*/
+static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
+{
+ struct ldb_message_element *el;
+
+ if (ldb_msg_find_element(msg, attr) != NULL) {
+ return 0;
+ }
+
+ if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != 0) {
+ return -1;
+ }
+
+ el = ldb_msg_find_element(msg, attr);
+ /* always set as replace. This works because on add ops, the flag
+ is ignored */
+ el->flags = LDB_FLAG_MOD_REPLACE;
+
+ return 0;
+}
+
+/* add_record: add objectGUID attribute */
+static int replmd_add(struct ldb_module *module, struct ldb_request *req)
+{
+ struct ldb_request *down_req;
+ struct ldb_message_element *attribute;
+ struct ldb_message *msg;
+ struct ldb_val v;
+ struct GUID guid;
+ uint64_t seq_num;
+ NTSTATUS nt_status;
+ int ret;
+ time_t t = time(NULL);
+
+ ldb_debug(module->ldb, LDB_DEBUG_TRACE, "replmd_add_record\n");
+
+ /* do not manipulate our control entries */
+ if (ldb_dn_is_special(req->op.add.message->dn)) {
+ return ldb_next_request(module, req);
+ }
+
+ if ((attribute = replmd_find_attribute(req->op.add.message, "objectGUID")) != NULL ) {
+ return ldb_next_request(module, req);
+ }
+
+ down_req = talloc(req, struct ldb_request);
+ if (down_req == NULL) {
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ *down_req = *req;
+
+ /* we have to copy the message as the caller might have it as a const */
+ down_req->op.add.message = msg = ldb_msg_copy_shallow(down_req, req->op.add.message);
+ if (msg == NULL) {
+ talloc_free(down_req);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ /* a new GUID */
+ guid = GUID_random();
+
+ nt_status = ndr_push_struct_blob(&v, msg, &guid,
+ (ndr_push_flags_fn_t)ndr_push_GUID);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(down_req);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ ret = ldb_msg_add_value(msg, "objectGUID", &v, NULL);
+ if (ret) {
+ talloc_free(down_req);
+ return ret;
+ }
+
+ if (add_time_element(msg, "whenCreated", t) != 0 ||
+ add_time_element(msg, "whenChanged", t) != 0) {
+ talloc_free(down_req);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ /* Get a sequence number from the backend */
+ ret = ldb_sequence_number(module->ldb, LDB_SEQ_NEXT, &seq_num);
+ if (ret == LDB_SUCCESS) {
+ if (add_uint64_element(msg, "uSNCreated", seq_num) != 0 ||
+ add_uint64_element(msg, "uSNChanged", seq_num) != 0) {
+ talloc_free(down_req);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+ }
+
+ ldb_set_timeout_from_prev_req(module->ldb, req, down_req);
+
+ /* go on with the call chain */
+ ret = ldb_next_request(module, down_req);
+
+ /* do not free down_req as the call results may be linked to it,
+ * it will be freed when the upper level request get freed */
+ if (ret == LDB_SUCCESS) {
+ req->handle = down_req->handle;
+ }
+
+ return ret;
+}
+
+/* modify_record: update timestamps */
+static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
+{
+ struct ldb_request *down_req;
+ struct ldb_message *msg;
+ int ret;
+ time_t t = time(NULL);
+ uint64_t seq_num;
+
+ ldb_debug(module->ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
+
+ /* do not manipulate our control entries */
+ if (ldb_dn_is_special(req->op.add.message->dn)) {
+ return ldb_next_request(module, req);
+ }
+
+ down_req = talloc(req, struct ldb_request);
+ if (down_req == NULL) {
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ *down_req = *req;
+
+ /* we have to copy the message as the caller might have it as a const */
+ down_req->op.mod.message = msg = ldb_msg_copy_shallow(down_req, req->op.mod.message);
+ if (msg == NULL) {
+ talloc_free(down_req);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ if (add_time_element(msg, "whenChanged", t) != 0) {
+ talloc_free(down_req);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ /* Get a sequence number from the backend */
+ ret = ldb_sequence_number(module->ldb, LDB_SEQ_NEXT, &seq_num);
+ if (ret == LDB_SUCCESS) {
+ if (add_uint64_element(msg, "uSNChanged", seq_num) != 0) {
+ talloc_free(down_req);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+ }
+
+ ldb_set_timeout_from_prev_req(module->ldb, req, down_req);
+
+ /* go on with the call chain */
+ ret = ldb_next_request(module, down_req);
+
+ /* do not free down_req as the call results may be linked to it,
+ * it will be freed when the upper level request get freed */
+ if (ret == LDB_SUCCESS) {
+ req->handle = down_req->handle;
+ }
+
+ return ret;
+}
+
+static const struct ldb_module_ops replmd_ops = {
+ .name = "repl_meta_data",
+ .add = replmd_add,
+ .modify = replmd_modify,
+};
+
+int repl_meta_data_module_init(void)
+{
+ return ldb_register_module(&replmd_ops);
+}
git.samba.org / amitay / samba.git / commitdiff