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|
/*
ldb database library
Copyright (C) Simo Sorce 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 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 server side sort control module
*
* Description: this module sorts the results of a search
*
* Author: Simo Sorce
*/
#include "includes.h"
#include "ldb/include/includes.h"
struct opaque {
struct ldb_context *ldb;
const struct ldb_attrib_handler *h;
const char *attribute;
int reverse;
int result;
};
struct sort_context {
struct ldb_module *module;
void *up_context;
int (*up_callback)(struct ldb_context *, void *, struct ldb_reply *);
char *attributeName;
char *orderingRule;
int reverse;
struct ldb_request *req;
struct ldb_message **msgs;
char **referrals;
struct ldb_control **controls;
int num_msgs;
int num_refs;
const struct ldb_attrib_handler *h;
int sort_result;
};
static struct ldb_handle *init_handle(void *mem_ctx, struct ldb_module *module,
void *context,
int (*callback)(struct ldb_context *, void *, struct ldb_reply *))
{
struct sort_context *ac;
struct ldb_handle *h;
h = talloc_zero(mem_ctx, struct ldb_handle);
if (h == NULL) {
ldb_set_errstring(module->ldb, talloc_asprintf(module, "Out of Memory"));
return NULL;
}
h->module = module;
ac = talloc_zero(h, struct sort_context);
if (ac == NULL) {
ldb_set_errstring(module->ldb, talloc_asprintf(module, "Out of Memory"));
talloc_free(h);
return NULL;
}
h->private_data = (void *)ac;
h->state = LDB_ASYNC_INIT;
h->status = LDB_SUCCESS;
ac->module = module;
ac->up_context = context;
ac->up_callback = callback;
return h;
}
static int build_response(void *mem_ctx, struct ldb_control ***ctrls, int result, const char *desc)
{
struct ldb_control **controls;
struct ldb_sort_resp_control *resp;
int i;
if (*ctrls) {
controls = *ctrls;
for (i = 0; controls[i]; i++);
controls = talloc_realloc(mem_ctx, controls, struct ldb_control *, i + 2);
} else {
i = 0;
controls = talloc_array(mem_ctx, struct ldb_control *, 2);
}
if (! controls )
return LDB_ERR_OPERATIONS_ERROR;
*ctrls = controls;
controls[i+1] = NULL;
controls[i] = talloc(controls, struct ldb_control);
if (! controls[i] )
return LDB_ERR_OPERATIONS_ERROR;
controls[i]->oid = LDB_CONTROL_SORT_RESP_OID;
controls[i]->critical = 0;
resp = talloc(controls[i], struct ldb_sort_resp_control);
if (! resp )
return LDB_ERR_OPERATIONS_ERROR;
resp->result = result;
resp->attr_desc = talloc_strdup(resp, desc);
if (! resp->attr_desc )
return LDB_ERR_OPERATIONS_ERROR;
controls[i]->data = resp;
return LDB_SUCCESS;
}
static int sort_compare(struct ldb_message **msg1, struct ldb_message **msg2, void *opaque)
{
struct sort_context *ac = talloc_get_type(opaque, struct sort_context);
struct ldb_message_element *el1, *el2;
if (ac->sort_result != 0) {
/* an error occurred previously,
* let's exit the sorting by returning always 0 */
return 0;
}
el1 = ldb_msg_find_element(*msg1, ac->attributeName);
el2 = ldb_msg_find_element(*msg2, ac->attributeName);
if (!el1 || !el2) {
/* the attribute was not found return and
* set an error */
ac->sort_result = 53;
return 0;
}
if (ac->reverse)
return ac->h->comparison_fn(ac->module->ldb, ac, &el2->values[0], &el1->values[0]);
return ac->h->comparison_fn(ac->module->ldb, ac, &el1->values[0], &el2->values[0]);
}
static int server_sort_search_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
{
struct sort_context *ac = NULL;
if (!context || !ares) {
ldb_set_errstring(ldb, talloc_asprintf(ldb, "NULL Context or Result in callback"));
goto error;
}
ac = talloc_get_type(context, struct sort_context);
if (ares->type == LDB_REPLY_ENTRY) {
ac->msgs = talloc_realloc(ac, ac->msgs, struct ldb_message *, ac->num_msgs + 2);
if (! ac->msgs) {
goto error;
}
ac->msgs[ac->num_msgs + 1] = NULL;
ac->msgs[ac->num_msgs] = talloc_steal(ac->msgs, ares->message);
if (! ac->msgs[ac->num_msgs]) {
goto error;
}
ac->num_msgs++;
}
if (ares->type == LDB_REPLY_REFERRAL) {
ac->referrals = talloc_realloc(ac, ac->referrals, char *, ac->num_refs + 2);
if (! ac->referrals) {
goto error;
}
ac->referrals[ac->num_refs + 1] = NULL;
ac->referrals[ac->num_refs] = talloc_steal(ac->referrals, ares->referral);
if (! ac->referrals[ac->num_refs]) {
goto error;
}
ac->num_refs++;
}
if (ares->type == LDB_REPLY_DONE) {
if (ares->controls) {
ac->controls = talloc_steal(ac, ares->controls);
if (! ac->controls) {
goto error;
}
}
}
talloc_free(ares);
return LDB_SUCCESS;
error:
talloc_free(ares);
return LDB_ERR_OPERATIONS_ERROR;
}
static int server_sort_search(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_control *control;
struct ldb_server_sort_control **sort_ctrls;
struct ldb_control **saved_controls;
struct sort_context *ac;
struct ldb_handle *h;
int ret;
/* check if there's a paged request control */
control = get_control_from_list(req->controls, LDB_CONTROL_SERVER_SORT_OID);
if (control == NULL) {
/* not found go on */
return ldb_next_request(module, req);
}
req->async.handle = NULL;
if (!req->async.callback || !req->async.context) {
ldb_set_errstring(module->ldb, talloc_asprintf(module, "Async interface called with NULL callback function or NULL context"));
return LDB_ERR_OPERATIONS_ERROR;
}
h = init_handle(req, module, req->async.context, req->async.callback);
if (!h) {
return LDB_ERR_OPERATIONS_ERROR;
}
ac = talloc_get_type(h->private_data, struct sort_context);
sort_ctrls = talloc_get_type(control->data, struct ldb_server_sort_control *);
if (!sort_ctrls) {
return LDB_ERR_PROTOCOL_ERROR;
}
/* FIXME: we do not support more than one attribute for sorting right now */
/* FIXME: we need to check if the attribute type exist or return an error */
if (sort_ctrls[1] != NULL) {
if (control->critical) {
struct ldb_reply *ares;
ares = talloc_zero(req, struct ldb_reply);
if (!ares)
return LDB_ERR_OPERATIONS_ERROR;
/* 53 = unwilling to perform */
ares->type = LDB_REPLY_DONE;
if ((ret = build_response(ares, &ares->controls, 53, "sort control is not complete yet")) != LDB_SUCCESS) {
return ret;
}
h->status = LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
h->state = LDB_ASYNC_DONE;
ret = ac->up_callback(module->ldb, ac->up_context, ares);
return ret;
} else {
/* just pass the call down and don't do any sorting */
ldb_next_request(module, req);
}
}
ac->attributeName = sort_ctrls[0]->attributeName;
ac->orderingRule = sort_ctrls[0]->orderingRule;
ac->reverse = sort_ctrls[0]->reverse;
ac->req = talloc(req, struct ldb_request);
if (!ac->req)
return LDB_ERR_OPERATIONS_ERROR;
ac->req->operation = req->operation;
ac->req->op.search.base = req->op.search.base;
ac->req->op.search.scope = req->op.search.scope;
ac->req->op.search.tree = req->op.search.tree;
ac->req->op.search.attrs = req->op.search.attrs;
ac->req->controls = req->controls;
/* save it locally and remove it from the list */
/* we do not need to replace them later as we
* are keeping the original req intact */
if (!save_controls(control, ac->req, &saved_controls)) {
return LDB_ERR_OPERATIONS_ERROR;
}
ac->req->async.context = ac;
ac->req->async.callback = server_sort_search_callback;
ldb_set_timeout_from_prev_req(module->ldb, req, ac->req);
req->async.handle = h;
return ldb_next_request(module, ac->req);
}
static int server_sort_results(struct ldb_handle *handle)
{
struct sort_context *ac;
struct ldb_reply *ares;
int i, ret;
ac = talloc_get_type(handle->private_data, struct sort_context);
ac->h = ldb_attrib_handler(ac->module->ldb, ac->attributeName);
ac->sort_result = 0;
ldb_qsort(ac->msgs, ac->num_msgs,
sizeof(struct ldb_message *),
ac, (ldb_qsort_cmp_fn_t)sort_compare);
for (i = 0; i < ac->num_msgs; i++) {
ares = talloc_zero(ac, struct ldb_reply);
if (!ares) {
handle->status = LDB_ERR_OPERATIONS_ERROR;
return handle->status;
}
ares->type = LDB_REPLY_ENTRY;
ares->message = talloc_steal(ares, ac->msgs[i]);
handle->status = ac->up_callback(ac->module->ldb, ac->up_context, ares);
if (handle->status != LDB_SUCCESS) {
return handle->status;
}
}
for (i = 0; i < ac->num_refs; i++) {
ares = talloc_zero(ac, struct ldb_reply);
if (!ares) {
handle->status = LDB_ERR_OPERATIONS_ERROR;
return handle->status;
}
ares->type = LDB_REPLY_REFERRAL;
ares->referral = talloc_steal(ares, ac->referrals[i]);
handle->status = ac->up_callback(ac->module->ldb, ac->up_context, ares);
if (handle->status != LDB_SUCCESS) {
return handle->status;
}
}
ares = talloc_zero(ac, struct ldb_reply);
if (!ares) {
handle->status = LDB_ERR_OPERATIONS_ERROR;
return handle->status;
}
ares->type = LDB_REPLY_DONE;
ares->controls = talloc_steal(ares, ac->controls);
handle->status = ac->up_callback(ac->module->ldb, ac->up_context, ares);
if (handle->status != LDB_SUCCESS) {
return handle->status;
}
if ((ret = build_response(ac, &ac->controls, ac->sort_result, "sort control is not complete yet")) != LDB_SUCCESS) {
return ret;
}
return LDB_SUCCESS;
}
static int server_sort_wait(struct ldb_handle *handle, enum ldb_wait_type type)
{
struct sort_context *ac;
int ret;
if (!handle || !handle->private_data) {
return LDB_ERR_OPERATIONS_ERROR;
}
ac = talloc_get_type(handle->private_data, struct sort_context);
ret = ldb_wait(ac->req->async.handle, type);
if (ret != LDB_SUCCESS) {
handle->status = ret;
return ret;
}
handle->state = ac->req->async.handle->state;
handle->status = ac->req->async.handle->status;
if (handle->status != LDB_SUCCESS) {
return handle->status;
}
if (handle->state == LDB_ASYNC_DONE) {
ret = server_sort_results(handle);
}
return ret;
}
static int server_sort_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_SERVER_SORT_OID;
req->controls = NULL;
ret = ldb_request(module->ldb, req);
if (ret != LDB_SUCCESS) {
ldb_debug(module->ldb, LDB_DEBUG_ERROR, "server_sort: Unable to register control with rootdse!\n");
talloc_free(req);
return LDB_ERR_OTHER;
}
talloc_free(req);
return ldb_next_init(module);
}
static const struct ldb_module_ops server_sort_ops = {
.name = "server_sort",
.search = server_sort_search,
.wait = server_sort_wait,
.init_context = server_sort_init
};
int ldb_sort_init(void)
{
return ldb_register_module(&server_sort_ops);
}
|