partition.c

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	/* Figure out which partition it is under */
	/* Skip the lot if 'data' isn't here yet (initialistion) */
	for (i=0; data && data->partitions && data->partitions[i]; i++) {
		struct ldb_module *next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
		
		ret = ldb_next_end_trans(next);
		talloc_free(next);
		if (ret != LDB_SUCCESS) {
			ret2 = ret;
		}
	}

	if (ret != LDB_SUCCESS) {
		/* Back it out, if it fails on one */
		for (i=0; data && data->partitions && data->partitions[i]; i++) {
			struct ldb_module *next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
			ldb_next_del_trans(next);
			talloc_free(next);
		}
	}
	return ret;
}

/* delete a transaction */
static int partition_del_trans(struct ldb_module *module)
{
	int i, ret, ret2 = LDB_SUCCESS;
	struct partition_private_data *data = talloc_get_type(module->private_data, 
							      struct partition_private_data);
	ret = ldb_next_del_trans(module);
	if (ret != LDB_SUCCESS) {
		ret2 = ret;
	}

	/* Look at base DN */
	/* Figure out which partition it is under */
	/* Skip the lot if 'data' isn't here yet (initialistion) */
	for (i=0; data && data->partitions && data->partitions[i]; i++) {
		struct ldb_module *next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
		
		ret = ldb_next_del_trans(next);
		talloc_free(next);
		if (ret != LDB_SUCCESS) {
			ret2 = ret;
		}
	}
	return ret2;
}

static int partition_sequence_number(struct ldb_module *module, struct ldb_request *req)
{
	int i, ret;
	uint64_t seq_number = 0;
	uint64_t timestamp_sequence = 0;
	uint64_t timestamp = 0;
	struct partition_private_data *data = talloc_get_type(module->private_data, 
							      struct partition_private_data);

	switch (req->op.seq_num.type) {
	case LDB_SEQ_NEXT:
	case LDB_SEQ_HIGHEST_SEQ:
	       	ret = ldb_next_request(module, req);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
		if (req->op.seq_num.flags & LDB_SEQ_TIMESTAMP_SEQUENCE) {
			timestamp_sequence = req->op.seq_num.seq_num;
		} else {
			seq_number = seq_number + req->op.seq_num.seq_num;
		}

		/* Look at base DN */
		/* Figure out which partition it is under */
		/* Skip the lot if 'data' isn't here yet (initialistion) */
		for (i=0; data && data->partitions && data->partitions[i]; i++) {
			struct ldb_module *next = make_module_for_next_request(req, module->ldb, data->partitions[i]->module);
			
			ret = ldb_next_request(next, req);
			talloc_free(next);
			if (ret != LDB_SUCCESS) {
				return ret;
			}
			if (req->op.seq_num.flags & LDB_SEQ_TIMESTAMP_SEQUENCE) {
				timestamp_sequence = MAX(timestamp_sequence, req->op.seq_num.seq_num);
			} else {
				seq_number = seq_number + req->op.seq_num.seq_num;
			}
		}
		/* fall though */
	case LDB_SEQ_HIGHEST_TIMESTAMP:
	{
		struct ldb_request *date_req = talloc(req, struct ldb_request);
		if (!date_req) {
			return LDB_ERR_OPERATIONS_ERROR;
		}
		*date_req = *req;
		date_req->op.seq_num.flags = LDB_SEQ_HIGHEST_TIMESTAMP;

		ret = ldb_next_request(module, date_req);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
		timestamp = date_req->op.seq_num.seq_num;
		
		/* Look at base DN */
		/* Figure out which partition it is under */
		/* Skip the lot if 'data' isn't here yet (initialistion) */
		for (i=0; data && data->partitions && data->partitions[i]; i++) {
			struct ldb_module *next = make_module_for_next_request(req, module->ldb, data->partitions[i]->module);
			
			ret = ldb_next_request(next, date_req);
			talloc_free(next);
			if (ret != LDB_SUCCESS) {
				return ret;
			}
			timestamp = MAX(timestamp, date_req->op.seq_num.seq_num);
		}
		break;
	}
	}

	switch (req->op.seq_num.flags) {
	case LDB_SEQ_NEXT:
	case LDB_SEQ_HIGHEST_SEQ:
		
		req->op.seq_num.flags = 0;

		/* Has someone above set a timebase sequence? */
		if (timestamp_sequence) {
			req->op.seq_num.seq_num = (((unsigned long long)timestamp << 24) | (seq_number & 0xFFFFFF));
		} else {
			req->op.seq_num.seq_num = seq_number;
		}

		if (timestamp_sequence > req->op.seq_num.seq_num) {
			req->op.seq_num.seq_num = timestamp_sequence;
			req->op.seq_num.flags |= LDB_SEQ_TIMESTAMP_SEQUENCE;
		}

		req->op.seq_num.flags |= LDB_SEQ_GLOBAL_SEQUENCE;
		break;
	case LDB_SEQ_HIGHEST_TIMESTAMP:
		req->op.seq_num.seq_num = timestamp;
		break;
	}

	switch (req->op.seq_num.flags) {
	case LDB_SEQ_NEXT:
		req->op.seq_num.seq_num++;
	}
	return LDB_SUCCESS;
}

static int partition_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
{
	struct dsdb_extended_replicated_objects *ext;

	ext = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
	if (!ext) {
		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "partition_extended_replicated_objects: invalid extended data\n");
		return LDB_ERR_PROTOCOL_ERROR;
	}

	if (ext->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
		ldb_debug(module->ldb, LDB_DEBUG_FATAL, "partition_extended_replicated_objects: extended data invalid version [%u != %u]\n",
			  ext->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
		return LDB_ERR_PROTOCOL_ERROR;
	}

	return partition_replicate(module, req, ext->partition_dn);
}

/* extended */
static int partition_extended(struct ldb_module *module, struct ldb_request *req)
{
	struct partition_context *ac;

	if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
		return partition_extended_replicated_objects(module, req);
	}

	/* 
	 * as the extended operation has no dn
	 * we need to send it to all partitions
	 */

	ac = partition_init_handle(req, module);
	if (!ac) {
		return LDB_ERR_OPERATIONS_ERROR;
	}
			
	return partition_send_all(module, ac, req);
}

static int sort_compare(void *void1,
			void *void2, void *opaque)
{
	struct dsdb_control_current_partition **pp1 = 
		(struct dsdb_control_current_partition **)void1;
	struct dsdb_control_current_partition **pp2 = 
		(struct dsdb_control_current_partition **)void2;
	struct dsdb_control_current_partition *partition1 = talloc_get_type(*pp1,
							    struct dsdb_control_current_partition);
	struct dsdb_control_current_partition *partition2 = talloc_get_type(*pp2,
							    struct dsdb_control_current_partition);

	return ldb_dn_compare(partition1->dn, partition2->dn);
}

static int partition_init(struct ldb_module *module)
{
	int ret, i;
	TALLOC_CTX *mem_ctx = talloc_new(module);
	const char *attrs[] = { "partition", "replicateEntries", "modules", NULL };
	struct ldb_result *res;
	struct ldb_message *msg;
	struct ldb_message_element *partition_attributes;
	struct ldb_message_element *replicate_attributes;
	struct ldb_message_element *modules_attributes;

	struct partition_private_data *data;

	if (!mem_ctx) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	data = talloc(mem_ctx, struct partition_private_data);
	if (data == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ret = ldb_search(module->ldb, ldb_dn_new(mem_ctx, module->ldb, "@PARTITION"),
			 LDB_SCOPE_BASE,
			 NULL, attrs,
			 &res);
	if (ret != LDB_SUCCESS) {
		talloc_free(mem_ctx);
		return ret;
	}
	talloc_steal(mem_ctx, res);
	if (res->count == 0) {
		talloc_free(mem_ctx);
		return ldb_next_init(module);
	}

	if (res->count > 1) {
		talloc_free(mem_ctx);
		return LDB_ERR_CONSTRAINT_VIOLATION;
	}

	msg = res->msgs[0];

	partition_attributes = ldb_msg_find_element(msg, "partition");
	if (!partition_attributes) {
		ldb_set_errstring(module->ldb, "partition_init: no partitions specified");
		talloc_free(mem_ctx);
		return LDB_ERR_CONSTRAINT_VIOLATION;
	}
	data->partitions = talloc_array(data, struct dsdb_control_current_partition *, partition_attributes->num_values + 1);
	if (!data->partitions) {
		talloc_free(mem_ctx);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	for (i=0; i < partition_attributes->num_values; i++) {
		char *base = talloc_strdup(data->partitions, (char *)partition_attributes->values[i].data);
		char *p = strchr(base, ':');
		if (!p) {
			ldb_asprintf_errstring(module->ldb, 
						"partition_init: "
						"invalid form for partition record (missing ':'): %s", base);
			talloc_free(mem_ctx);
			return LDB_ERR_CONSTRAINT_VIOLATION;
		}
		p[0] = '\0';
		p++;
		if (!p[0]) {
			ldb_asprintf_errstring(module->ldb, 
						"partition_init: "
						"invalid form for partition record (missing backend database): %s", base);
			talloc_free(mem_ctx);
			return LDB_ERR_CONSTRAINT_VIOLATION;
		}
		data->partitions[i] = talloc(data->partitions, struct dsdb_control_current_partition);
		if (!data->partitions[i]) {
			talloc_free(mem_ctx);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		data->partitions[i]->version = DSDB_CONTROL_CURRENT_PARTITION_VERSION;

		data->partitions[i]->dn = ldb_dn_new(data->partitions[i], module->ldb, base);
		if (!data->partitions[i]->dn) {
			ldb_asprintf_errstring(module->ldb, 
						"partition_init: invalid DN in partition record: %s", base);
			talloc_free(mem_ctx);
			return LDB_ERR_CONSTRAINT_VIOLATION;
		}

		data->partitions[i]->backend = samdb_relative_path(module->ldb, 
								   data->partitions[i], 
								   p);
		if (!data->partitions[i]->backend) {
			ldb_asprintf_errstring(module->ldb, 
						"partition_init: unable to determine an relative path for partition: %s", base);
			talloc_free(mem_ctx);			
		}
		ret = ldb_connect_backend(module->ldb, data->partitions[i]->backend, NULL, &data->partitions[i]->module);
		if (ret != LDB_SUCCESS) {
			talloc_free(mem_ctx);
			return ret;
		}
	}
	data->partitions[i] = NULL;

	/* sort these into order, most to least specific */
	ldb_qsort(data->partitions, partition_attributes->num_values, sizeof(*data->partitions), 
		  module->ldb, sort_compare);

	for (i=0; data->partitions[i]; i++) {
		struct ldb_request *req;
		req = talloc_zero(mem_ctx, struct ldb_request);
		if (req == NULL) {
			ldb_debug(module->ldb, LDB_DEBUG_ERROR, "partition: Out of memory!\n");
			talloc_free(mem_ctx);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		
		req->operation = LDB_REQ_REGISTER_PARTITION;
		req->op.reg_partition.dn = data->partitions[i]->dn;
		
		ret = ldb_request(module->ldb, req);
		if (ret != LDB_SUCCESS) {
			ldb_debug(module->ldb, LDB_DEBUG_ERROR, "partition: Unable to register partition with rootdse!\n");
			talloc_free(mem_ctx);
			return LDB_ERR_OTHER;
		}
		talloc_free(req);
	}

	replicate_attributes = ldb_msg_find_element(msg, "replicateEntries");
	if (!replicate_attributes) {
		data->replicate = NULL;
	} else {
		data->replicate = talloc_array(data, struct ldb_dn *, replicate_attributes->num_values + 1);
		if (!data->replicate) {
			talloc_free(mem_ctx);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		
		for (i=0; i < replicate_attributes->num_values; i++) {
			data->replicate[i] = ldb_dn_new(data->replicate, module->ldb, (const char *)replicate_attributes->values[i].data);
			if (!ldb_dn_validate(data->replicate[i])) {
				ldb_asprintf_errstring(module->ldb, 
							"partition_init: "
							"invalid DN in partition replicate record: %s", 
							replicate_attributes->values[i].data);
				talloc_free(mem_ctx);
				return LDB_ERR_CONSTRAINT_VIOLATION;
			}
		}
		data->replicate[i] = NULL;
	}

	/* Make the private data available to any searches the modules may trigger in initialisation */
	module->private_data = data;
	talloc_steal(module, data);
	
	modules_attributes = ldb_msg_find_element(msg, "modules");
	if (modules_attributes) {
		for (i=0; i < modules_attributes->num_values; i++) {
			struct ldb_dn *base_dn;
			int partition_idx;
			struct dsdb_control_current_partition *partition = NULL;
			const char **modules = NULL;

			char *base = talloc_strdup(data->partitions, (char *)modules_attributes->values[i].data);
			char *p = strchr(base, ':');
			if (!p) {
				ldb_asprintf_errstring(module->ldb, 
							"partition_init: "
							"invalid form for partition module record (missing ':'): %s", base);
				talloc_free(mem_ctx);
				return LDB_ERR_CONSTRAINT_VIOLATION;
			}
			p[0] = '\0';
			p++;
			if (!p[0]) {
				ldb_asprintf_errstring(module->ldb, 
							"partition_init: "
							"invalid form for partition module record (missing backend database): %s", base);
				talloc_free(mem_ctx);
				return LDB_ERR_CONSTRAINT_VIOLATION;
			}

			modules = ldb_modules_list_from_string(module->ldb, mem_ctx,
							       p);
			
			base_dn = ldb_dn_new(mem_ctx, module->ldb, base);
			if (!ldb_dn_validate(base_dn)) {
				talloc_free(mem_ctx);
				return LDB_ERR_OPERATIONS_ERROR;
			}
			
			for (partition_idx = 0; data->partitions[partition_idx]; partition_idx++) {
				if (ldb_dn_compare(data->partitions[partition_idx]->dn, base_dn) == 0) {
					partition = data->partitions[partition_idx];
					break;
				}
			}
			
			if (!partition) {
				ldb_asprintf_errstring(module->ldb, 
							"partition_init: "
							"invalid form for partition module record (no such partition): %s", base);
				talloc_free(mem_ctx);
				return LDB_ERR_CONSTRAINT_VIOLATION;
			}
			
			ret = ldb_load_modules_list(module->ldb, modules, partition->module, &partition->module);
			if (ret != LDB_SUCCESS) {
				ldb_asprintf_errstring(module->ldb, 
						       "partition_init: "
						       "loading backend for %s failed: %s", 
						       base, ldb_errstring(module->ldb));
				talloc_free(mem_ctx);
				return ret;
			}
			ret = ldb_init_module_chain(module->ldb, partition->module);
			if (ret != LDB_SUCCESS) {
				ldb_asprintf_errstring(module->ldb, 
						       "partition_init: "
						       "initialising backend for %s failed: %s", 
						       base, ldb_errstring(module->ldb));
				talloc_free(mem_ctx);
				return ret;
			}
		}
	}

	talloc_free(mem_ctx);
	return ldb_next_init(module);
}

static int partition_wait_none(struct ldb_handle *handle) {
	struct partition_context *ac;
	int ret;
	int i;
    
	if (!handle || !handle->private_data) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (handle->state == LDB_ASYNC_DONE) {
		return handle->status;
	}

	handle->state = LDB_ASYNC_PENDING;
	handle->status = LDB_SUCCESS;

	ac = talloc_get_type(handle->private_data, struct partition_context);

	for (i=0; i < ac->num_requests; i++) {
		ret = ldb_wait(ac->down_req[i]->handle, LDB_WAIT_NONE);
		
		if (ret != LDB_SUCCESS) {
			handle->status = ret;
			goto done;
		}
		if (ac->down_req[i]->handle->status != LDB_SUCCESS) {
			handle->status = ac->down_req[i]->handle->status;
			goto done;
		}
		
		if (ac->down_req[i]->handle->state != LDB_ASYNC_DONE) {
			return LDB_SUCCESS;
		}
	}

	ret = LDB_SUCCESS;

done:
	handle->state = LDB_ASYNC_DONE;
	return ret;
}


static int partition_wait_all(struct ldb_handle *handle) {

	int ret;

	while (handle->state != LDB_ASYNC_DONE) {
		ret = partition_wait_none(handle);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	return handle->status;
}

static int partition_wait(struct ldb_handle *handle, enum ldb_wait_type type)
{
	if (type == LDB_WAIT_ALL) {
		return partition_wait_all(handle);
	} else {
		return partition_wait_none(handle);
	}
}

_PUBLIC_ const struct ldb_module_ops ldb_partition_module_ops = {
	.name		   = "partition",
	.init_context	   = partition_init,
	.search            = partition_search,
	.add               = partition_add,
	.modify            = partition_modify,
	.del               = partition_delete,
	.rename            = partition_rename,
	.extended          = partition_extended,
	.sequence_number   = partition_sequence_number,
	.start_transaction = partition_start_trans,
	.end_transaction   = partition_end_trans,
	.del_transaction   = partition_del_trans,
	.wait              = partition_wait
};