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/*
ldb database library
Copyright (C) Simo Sorce 2004-2006
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
Copyright (C) Andrew Tridgell 2005
** 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 3 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, 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/include/ldb_includes.h"
#include "librpc/gen_ndr/ndr_misc.h"
static struct ldb_message_element *objectguid_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 objectguid_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;
enum ndr_err_code ndr_err;
int ret;
time_t t = time(NULL);
ldb_debug(module->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);
}
if ((attribute = objectguid_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();
ndr_err = ndr_push_struct_blob(&v, msg, &guid,
(ndr_push_flags_fn_t)ndr_push_GUID);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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 objectguid_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, "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);
}
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 objectguid_ops = {
.name = "objectguid",
.add = objectguid_add,
.modify = objectguid_modify,
};
int objectguid_module_init(void)
{
return ldb_register_module(&objectguid_ops);
}
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