r12733: Merge ldap/ldb controls into main tree

There's still lot of work to do but the patch is stable
enough to be pushed into the main samba4 tree.

Simo.
(This used to be commit 77125feaff252cab44d26593093a9c211c846ce8)

1 files changed, 296 insertions, 0 deletions

diff --git a/source4/lib/ldb/modules/paged_results.c b/source4/lib/ldb/modules/paged_results.c
new file mode 100644
index 0000000000..31b73d2ae4
--- /dev/null
+++ b/source4/lib/ldb/modules/paged_results.c
@@ -0,0 +1,296 @@
+/* 
+   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 paged results control module
+ *
+ *  Description: this module caches a complete search and sends back
+ *  		 results in chunks as asked by the client
+ *
+ *  Author: Simo Sorce
+ */
+
+#include "includes.h"
+#include "ldb/include/ldb.h"
+#include "ldb/include/ldb_errors.h"
+#include "ldb/include/ldb_private.h"
+
+#include <time.h>
+
+struct results_store {
+	char *cookie;
+	time_t timestamp;
+	int num_sent;
+	struct ldb_result *result;
+	struct results_store *prev;
+	struct results_store *next;
+};
+
+struct private_data {
+
+	int next_free_id;
+	struct results_store *store;
+	
+};
+
+
+static struct results_store *new_store(struct private_data *priv)
+{
+	struct results_store *new;
+	int new_id = priv->next_free_id++;
+
+	/* TODO: we should have a limit on the number of
+	 * outstanding paged searches
+	 */
+
+	new = talloc(priv, struct results_store);
+	if (!new) return NULL;
+
+	new->cookie = talloc_asprintf(new, "%d", new_id);
+	if (!new->cookie) {
+		talloc_free(new);
+		return NULL;
+	}
+
+	new->timestamp = time(NULL);
+
+	new->num_sent = 0;
+	new->result = NULL;
+
+	/* put this entry as first */
+	new->prev = NULL;
+	new->next = priv->store;
+	if (priv->store != NULL) priv->store->prev = new;
+	priv->store = new;
+
+	return new;
+}
+
+static void remove_store(struct results_store *store)
+{
+	if (store->prev) {
+		store->prev->next = store->next;
+	}
+	if (store->next) {
+		store->next->prev = store->prev;
+	}
+	talloc_free(store);
+}
+
+/* search */
+static int paged_search(struct ldb_module *module, struct ldb_request *req)
+{
+	struct private_data *private_data = talloc_get_type(module->private_data, struct private_data);
+	struct results_store *current = NULL;
+	struct ldb_result *paged_result;
+	struct ldb_control **saved_controls;
+	struct ldb_control *control;
+	struct ldb_paged_control *paged_ctrl;
+	struct ldb_paged_control *paged_ret;
+	int i, ret;
+
+	/* check if there's a paged request control */
+	control = get_control_from_list(req->controls, LDB_CONTROL_PAGED_RESULTS_OID);
+
+	if (control == NULL) {
+		/* not found go on */
+		return ldb_next_request(module, req);
+	}
+
+	paged_ctrl = talloc_get_type(control->data, struct ldb_paged_control);
+
+	/* check if it is a continuation search the store */
+	if (paged_ctrl->cookie_len != 0) {
+		for (current = private_data->store; current; current = current->next) {
+			if (strcmp(current->cookie, paged_ctrl->cookie) == 0) {
+				current->timestamp = time(NULL);
+				break;
+			}
+		}
+		if (current == NULL) {
+			return LDB_ERR_UNWILLING_TO_PERFORM;
+		}
+	}
+
+	/* is this a brand new paged request ? */
+	if (current == NULL) {
+
+		/* save controls list and remove this one from the list */
+		if (!save_controls(control, req, &saved_controls)) {
+			return LDB_ERR_OTHER;
+		}
+
+		/* perform the search */
+		ret = ldb_next_request(module, req);
+
+		/* restore original controls list */
+		if (req->controls) talloc_free(req->controls);
+		req->controls = saved_controls;
+
+		if (ret != LDB_SUCCESS) {
+			return ret;
+		}
+
+		/* create a new entry in the cache */
+		current = new_store(private_data);
+		if (!current) {
+			return LDB_ERR_OTHER;
+		}
+
+		/* steal the search result */
+		current->result = talloc_steal(current, req->op.search.res);
+		req->op.search.res = NULL;
+	}
+
+	/* create a container for the next batch of results */
+	paged_result = talloc(current, struct ldb_result);
+	if (!paged_result) {
+		return LDB_ERR_OTHER;
+	}
+	paged_result->count = 0;
+	paged_result->msgs = NULL;
+	paged_result->controls = NULL;
+
+	/* check if it is an abandon */
+	if (paged_ctrl->size == 0) {
+		req->op.search.res = talloc_steal(private_data, paged_result);
+		remove_store(current);
+		return LDB_SUCCESS;
+	}
+
+	/* return a batch of results */
+		
+	paged_result->controls = talloc_array(paged_result, struct ldb_control *, 2);
+	if (!paged_result->controls) {
+		talloc_free(paged_result);
+		return LDB_ERR_OTHER;
+	}
+
+	paged_result->controls[0] = talloc(paged_result->controls, struct ldb_control);
+	if (!paged_result->controls[0]) {
+		talloc_free(paged_result);
+		return LDB_ERR_OTHER;
+	}
+	paged_result->controls[0]->oid = talloc_strdup(paged_result->controls[0], LDB_CONTROL_PAGED_RESULTS_OID);
+	paged_result->controls[0]->critical = 0;
+	paged_result->controls[1] = NULL;
+
+	paged_ret = talloc(paged_result->controls[0], struct ldb_paged_control);
+	if (!paged_ret) {
+		talloc_free(paged_result);
+		return LDB_ERR_OTHER;
+	}
+	paged_result->controls[0]->data = paged_ret;
+
+	if (paged_ctrl->size >= current->result->count) {
+		paged_ret->size = 0;
+		paged_ret->cookie = NULL;
+		paged_ret->cookie_len = 0;
+		paged_result->count = current->result->count;
+		current->result->count = 0;
+	} else {
+		paged_ret->size = current->result->count;
+		paged_ret->cookie = talloc_strdup(paged_ret, current->cookie);
+		paged_ret->cookie_len = strlen(paged_ret->cookie) + 1;
+		paged_result->count = paged_ctrl->size;
+		current->result->count -= paged_ctrl->size;
+	}
+
+	paged_result->msgs = talloc_array(paged_result, struct ldb_message *, paged_result->count + 1);
+	if (!paged_result->msgs) {
+		talloc_free(paged_result);
+		return LDB_ERR_OTHER;
+	}
+	for (i = 0; i < paged_result->count; i++) {
+		paged_result->msgs[i] = talloc_steal(paged_result->msgs, current->result->msgs[current->num_sent + i]);
+	}
+	current->num_sent += paged_result->count;
+	paged_result->msgs[paged_result->count] = NULL;
+
+	req->op.search.res = paged_result;
+
+	return LDB_SUCCESS;	
+}
+
+static int paged_request(struct ldb_module *module, struct ldb_request *req)
+{
+	switch (req->operation) {
+
+	case LDB_REQ_SEARCH:
+		return paged_search(module, req);
+
+	default:
+		return ldb_next_request(module, req);
+
+	}
+}
+
+static const struct ldb_module_ops paged_ops = {
+	.name		   = "paged_results",
+	.request      	   = paged_request,
+};
+
+struct ldb_module *paged_results_module_init(struct ldb_context *ldb, int stage, const char *options[])
+{
+	struct ldb_module *ctx;
+	struct private_data *data;
+
+	if (stage == LDB_MODULES_INIT_STAGE_2) {
+		struct ldb_request request;
+		int ret;
+
+		request.operation = LDB_REQ_REGISTER;
+		request.op.reg.oid = LDB_CONTROL_PAGED_RESULTS_OID;
+		request.controls = NULL;
+
+		ret = ldb_request(ldb, &request);
+		if (ret != LDB_SUCCESS) {
+			ldb_debug(ldb, LDB_DEBUG_ERROR, "paged_request: Unable to register control with rootdse!\n");
+		}
+
+		return NULL;
+	}
+
+	ctx = talloc(ldb, struct ldb_module);
+	if (!ctx)
+		return NULL;
+
+	data = talloc(ctx, struct private_data);
+	if (data == NULL) {
+		talloc_free(ctx);
+		return NULL;
+	}
+
+	data->next_free_id = 1;
+	data->store = NULL;
+	ctx->private_data = data;
+
+	ctx->ldb = ldb;
+	ctx->prev = ctx->next = NULL;
+	ctx->ops = &paged_ops;
+
+	return ctx;
+}