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/*
ldb database library
Copyright (C) Simo Sorce 2004-2008
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
Copyright (C) Andrew Tridgell 2005
Copyright (C) Stefan Metzmacher <metze@samba.org> 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/>.
*/
/*
* Name: ldb
*
* Component: ldb instancetype module
*
* Description: add an instanceType onto every new record
*
* Author: Andrew Bartlett
*/
#include "includes.h"
#include "ldb.h"
#include "ldb_module.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "dsdb/samdb/samdb.h"
#include "../libds/common/flags.h"
#include "dsdb/samdb/ldb_modules/util.h"
/* add_record: add instancetype attribute */
static int instancetype_add(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb = ldb_module_get_ctx(module);
struct ldb_request *down_req;
struct ldb_message *msg;
struct ldb_message_element *el;
uint32_t instanceType;
int ret;
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.add.message->dn)) {
return ldb_next_request(module, req);
}
ldb_debug(ldb, LDB_DEBUG_TRACE, "instancetype_add\n");
el = ldb_msg_find_element(req->op.add.message, "instanceType");
if (el != NULL) {
if (el->num_values != 1) {
ldb_set_errstring(ldb, "instancetype: the 'instanceType' attribute is single-valued!");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
instanceType = ldb_msg_find_attr_as_uint(req->op.add.message,
"instanceType", 0);
if (!(instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
/*
* If we have no NC add operation (no TYPE_IS_NC_HEAD)
* then "instanceType" can only be "0" or "TYPE_WRITE".
*/
if ((instanceType != 0) &&
((instanceType & INSTANCE_TYPE_WRITE) == 0)) {
ldb_set_errstring(ldb, "instancetype: if TYPE_IS_NC_HEAD wasn't set, then only TYPE_WRITE or 0 are allowed!");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
} else {
/*
* If we have a NC add operation then we need also the
* "TYPE_WRITE" flag in order to succeed,
* unless this NC is not instantiated
*/
if (!(instanceType & INSTANCE_TYPE_WRITE)) {
ldb_set_errstring(ldb, "instancetype: if TYPE_IS_NC_HEAD was set, then also TYPE_WRITE is requested!");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
}
/* we did only tests, so proceed with the original request */
return ldb_next_request(module, req);
}
/* we have to copy the message as the caller might have it as a const */
msg = ldb_msg_copy_shallow(req, req->op.add.message);
if (msg == NULL) {
return ldb_oom(ldb);
}
/*
* TODO: calculate correct instance type
*/
instanceType = INSTANCE_TYPE_WRITE;
ret = samdb_msg_add_uint(ldb, msg, msg, "instanceType", instanceType);
if (ret != LDB_SUCCESS) {
return ret;
}
ret = ldb_build_add_req(&down_req, ldb, req,
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);
}
/* deny instancetype modification */
static int instancetype_mod(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb = ldb_module_get_ctx(module);
struct ldb_message_element *el;
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.mod.message->dn)) {
return ldb_next_request(module, req);
}
ldb_debug(ldb, LDB_DEBUG_TRACE, "instancetype_mod\n");
el = ldb_msg_find_element(req->op.mod.message, "instanceType");
if (el != NULL) {
/* Except to allow dbcheck to fix things, this must never be modified */
if (!ldb_request_get_control(req, DSDB_CONTROL_DBCHECK)) {
ldb_set_errstring(ldb, "instancetype: the 'instanceType' attribute can never be changed!");
return LDB_ERR_CONSTRAINT_VIOLATION;
}
}
return ldb_next_request(module, req);
}
static const struct ldb_module_ops ldb_instancetype_module_ops = {
.name = "instancetype",
.add = instancetype_add,
.modify = instancetype_mod
};
int ldb_instancetype_module_init(const char *version)
{
LDB_MODULE_CHECK_VERSION(version);
return ldb_register_module(&ldb_instancetype_module_ops);
}
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