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/*
ldb database library
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
Copyright (C) Andrew Tridgell 2005
Copyright (C) Simo Sorce 2004-2008
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/>.
*/
/*
* Name: ldb
*
* Component: ldb objectguid module
*
* Description: add a unique objectGUID onto every new record
*
* Author: Simo Sorce
*/
#include "includes.h"
#include "ldb_module.h"
#include "dsdb/samdb/samdb.h"
#include "dsdb/samdb/ldb_modules/util.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "param/param.h"
/*
add a time element to a record
*/
static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
{
char *s;
int ret;
if (ldb_msg_find_element(msg, attr) != NULL) {
return LDB_SUCCESS;
}
s = ldb_timestring(msg, t);
if (s == NULL) {
return LDB_ERR_OPERATIONS_ERROR;
}
/* always set as replace. This works because on add ops, the flag
is ignored */
ret = ldb_msg_append_string(msg, attr, s, LDB_FLAG_MOD_REPLACE);
if (ret != LDB_SUCCESS) {
return ret;
}
return LDB_SUCCESS;
}
/*
add a uint64_t element to a record
*/
static int add_uint64_element(struct ldb_context *ldb, struct ldb_message *msg,
const char *attr, uint64_t v)
{
int ret;
if (ldb_msg_find_element(msg, attr) != NULL) {
return LDB_SUCCESS;
}
/* always set as replace. This works because on add ops, the flag
is ignored */
ret = samdb_msg_append_uint64(ldb, msg, msg, attr, v, LDB_FLAG_MOD_REPLACE);
if (ret != LDB_SUCCESS) {
return ret;
}
return LDB_SUCCESS;
}
struct og_context {
struct ldb_module *module;
struct ldb_request *req;
};
/* add_record: add objectGUID and timestamp attributes */
static int objectguid_add(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb;
struct ldb_request *down_req;
struct ldb_message *msg;
struct ldb_message_element *el;
struct GUID guid;
uint64_t seq_num;
int ret;
time_t t = time(NULL);
struct og_context *ac;
ldb = ldb_module_get_ctx(module);
ldb_debug(ldb, LDB_DEBUG_TRACE, "objectguid_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);
}
el = ldb_msg_find_element(req->op.add.message, "objectGUID");
if (el != NULL) {
ldb_set_errstring(ldb,
"objectguid: objectGUID must not be specified!");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
ac = talloc(req, struct og_context);
if (ac == NULL) {
return ldb_oom(ldb);
}
ac->module = module;
ac->req = req;
/* we have to copy the message as the caller might have it as a const */
msg = ldb_msg_copy_shallow(ac, req->op.add.message);
if (msg == NULL) {
talloc_free(ac);
return ldb_operr(ldb);
}
/* a new GUID */
guid = GUID_random();
ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
if (ret != LDB_SUCCESS) {
return ret;
}
if (add_time_element(msg, "whenCreated", t) != LDB_SUCCESS ||
add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
return ldb_operr(ldb);
}
/* Get a sequence number from the backend */
ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
if (ret == LDB_SUCCESS) {
if (add_uint64_element(ldb, msg, "uSNCreated",
seq_num) != LDB_SUCCESS ||
add_uint64_element(ldb, msg, "uSNChanged",
seq_num) != LDB_SUCCESS) {
return ldb_operr(ldb);
}
}
ret = ldb_build_add_req(&down_req, ldb, ac,
msg,
req->controls,
req, dsdb_next_callback,
req);
LDB_REQ_SET_LOCATION(down_req);
if (ret != LDB_SUCCESS) {
return ret;
}
/* go on with the call chain */
return ldb_next_request(module, down_req);
}
/* modify_record: update timestamps */
static int objectguid_modify(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb;
struct ldb_request *down_req;
struct ldb_message *msg;
struct ldb_message_element *el;
int ret;
time_t t = time(NULL);
uint64_t seq_num;
struct og_context *ac;
ldb = ldb_module_get_ctx(module);
ldb_debug(ldb, LDB_DEBUG_TRACE, "objectguid_modify_record\n");
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.mod.message->dn)) {
return ldb_next_request(module, req);
}
el = ldb_msg_find_element(req->op.mod.message, "objectGUID");
if (el != NULL) {
ldb_set_errstring(ldb,
"objectguid: objectGUID must not be specified!");
return LDB_ERR_CONSTRAINT_VIOLATION;
}
ac = talloc(req, struct og_context);
if (ac == NULL) {
return ldb_oom(ldb);
}
ac->module = module;
ac->req = req;
/* we have to copy the message as the caller might have it as a const */
msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
if (msg == NULL) {
return ldb_operr(ldb);
}
if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
return ldb_operr(ldb);
}
/* Get a sequence number from the backend */
ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
if (ret == LDB_SUCCESS) {
if (add_uint64_element(ldb, msg, "uSNChanged",
seq_num) != LDB_SUCCESS) {
return ldb_operr(ldb);
}
}
ret = ldb_build_mod_req(&down_req, ldb, ac,
msg,
req->controls,
req, dsdb_next_callback,
req);
LDB_REQ_SET_LOCATION(down_req);
if (ret != LDB_SUCCESS) {
return ret;
}
/* go on with the call chain */
return ldb_next_request(module, down_req);
}
static const struct ldb_module_ops ldb_objectguid_module_ops = {
.name = "objectguid",
.add = objectguid_add,
.modify = objectguid_modify
};
int ldb_objectguid_module_init(const char *version)
{
LDB_MODULE_CHECK_VERSION(version);
return ldb_register_module(&ldb_objectguid_module_ops);
}
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