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/*
ldb database library
Copyright (C) Simo Sorce 2005
Copyright (C) Stefa Metzmacher <metze@samba.org> 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 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 deleted objects control module
*
* Description: this module hides deleted objects, and returns them if the control is there
*
* Author: Stefan Metzmacher
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_errors.h"
#include "ldb/include/ldb_private.h"
#include "dsdb/samdb/samdb.h"
/* search */
struct show_deleted_search_request {
struct ldb_module *module;
void *up_context;
int (*up_callback)(struct ldb_context *, void *, struct ldb_reply *);
bool remove_from_msg;
};
static int show_deleted_search_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
{
struct show_deleted_search_request *ar;
ar = talloc_get_type(context, struct show_deleted_search_request);
if (ares->type == LDB_REPLY_ENTRY) {
bool isDeleted;
isDeleted = ldb_msg_find_attr_as_bool(ares->message, "isDeleted", false);
if (isDeleted) {
goto skip_deleted;
}
if (ar->remove_from_msg) {
ldb_msg_remove_attr(ares->message, "isDeleted");
}
}
return ar->up_callback(ldb, ar->up_context, ares);
skip_deleted:
talloc_free(ares);
return LDB_SUCCESS;
}
static int show_deleted_search(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_control *control;
struct ldb_control **saved_controls;
struct show_deleted_search_request *ar;
struct ldb_request *down_req;
char **new_attrs;
uint32_t num_attrs = 0;
uint32_t i;
int ret;
/* check if there's a show deleted control */
control = ldb_request_get_control(req, LDB_CONTROL_SHOW_DELETED_OID);
/* copy the request for modification */
down_req = talloc(req, struct ldb_request);
if (down_req == NULL) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
/* copy the request */
*down_req = *req;
/* if a control is there remove if from the modified request */
if (control && !save_controls(control, down_req, &saved_controls)) {
return LDB_ERR_OPERATIONS_ERROR;
}
/* if we had a control, then just go on to the next request as we have nothing to hide */
if (control) {
goto next_request;
}
ar = talloc(down_req, struct show_deleted_search_request);
if (ar == NULL) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
ar->module = module;
ar->up_context = req->context;
ar->up_callback = req->callback;
ar->remove_from_msg = true;
/* check if attrs only is specified, in that case check wether we need to modify them */
if (down_req->op.search.attrs) {
for (i=0; (down_req->op.search.attrs && down_req->op.search.attrs[i]); i++) {
num_attrs++;
if (strcasecmp(down_req->op.search.attrs[i], "*") == 0) {
ar->remove_from_msg = false;
} else if (strcasecmp(down_req->op.search.attrs[i], "isDeleted") == 0) {
ar->remove_from_msg = false;
}
}
} else {
ar->remove_from_msg = false;
}
if (ar->remove_from_msg) {
new_attrs = talloc_array(down_req, char *, num_attrs + 2);
if (!new_attrs) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
for (i=0; i < num_attrs; i++) {
new_attrs[i] = discard_const_p(char, down_req->op.search.attrs[i]);
}
new_attrs[i] = talloc_strdup(new_attrs, "isDeleted");
if (!new_attrs[i]) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
new_attrs[i+1] = NULL;
down_req->op.search.attrs = (const char * const *)new_attrs;
}
down_req->context = ar;
down_req->callback = show_deleted_search_callback;
ldb_set_timeout_from_prev_req(module->ldb, req, down_req);
next_request:
/* perform the search */
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 int show_deleted_init(struct ldb_module *module)
{
struct ldb_request *req;
int ret;
req = talloc(module, struct ldb_request);
if (req == NULL) {
return LDB_ERR_OPERATIONS_ERROR;
}
req->operation = LDB_REQ_REGISTER_CONTROL;
req->op.reg_control.oid = LDB_CONTROL_SHOW_DELETED_OID;
req->controls = NULL;
ret = ldb_request(module->ldb, req);
if (ret != LDB_SUCCESS) {
ldb_debug(module->ldb, LDB_DEBUG_ERROR, "show_deleted: Unable to register control with rootdse!\n");
talloc_free(req);
return LDB_ERR_OPERATIONS_ERROR;
}
talloc_free(req);
return ldb_next_init(module);
}
static const struct ldb_module_ops show_deleted_ops = {
.name = "show_deleted",
.search = show_deleted_search,
.init_context = show_deleted_init
};
int ldb_show_deleted_init(void)
{
return ldb_register_module(&show_deleted_ops);
}
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