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  +   ˆl–äY>”ªh¥8 …q·®4ê˜´oÈ„BÛ_†I|¥+ÈÇ +“    /*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


#ifndef DNS_REQUEST_H
#define DNS_REQUEST_H 1

/*****
 ***** Module Info
 *****/

/*! \file dns/request.h
 *
 * \brief
 * The request module provides simple request/response services useful for
 * sending SOA queries, DNS Notify messages, and dynamic update requests.
 *
 * MP:
 *\li	The module ensures appropriate synchronization of data structures it
 *	creates and manipulates.
 *
 * Resources:
 *\li	TBS
 *
 * Security:
 *\li	No anticipated impact.
 */

#include <isc/lang.h>
#include <isc/event.h>

#include <dns/types.h>

#define DNS_REQUESTOPT_TCP 0x00000001U
#define DNS_REQUESTOPT_CASE 0x00000002U
#define DNS_REQUESTOPT_FIXEDID 0x00000004U
#define DNS_REQUESTOPT_SHARE 0x00000008U

typedef struct dns_requestevent {
	ISC_EVENT_COMMON(struct dns_requestevent);
	isc_result_t result;
	dns_request_t *request;
} dns_requestevent_t;

ISC_LANG_BEGINDECLS

isc_result_t
dns_requestmgr_create(isc_mem_t *mctx, isc_timermgr_t *timermgr,
		      isc_socketmgr_t *socketmgr, isc_taskmgr_t *taskmgr,
		      dns_dispatchmgr_t *dispatchmgr,
		      dns_dispatch_t *dispatchv4, dns_dispatch_t *dispatchv6,
		      dns_requestmgr_t **requestmgrp);
/*%<
 * Create a request manager.
 *
 * Requires:
 *
 *\li	'mctx' is a valid memory context.
 *
 *\li	'timermgr' is a valid timer manager.
 *
 *\li	'socketmgr' is a valid socket manager.
 *
 *\li	'taskmgr' is a valid task manager.
 *
 *\li	'dispatchv4' is a valid dispatcher with an IPv4 UDP socket, or is NULL.
 *
 *\li	'dispatchv6' is a valid dispatcher with an IPv6 UDP socket, or is NULL.
 *
 *\li	requestmgrp != NULL && *requestmgrp == NULL
 *
 * Ensures:
 *
 *\li	On success, *requestmgrp is a valid request manager.
 *
 * Returns:
 *
 *\li	ISC_R_SUCCESS
 *
 *\li	Any other result indicates failure.
 */

void
dns_requestmgr_whenshutdown(dns_requestmgr_t *requestmgr, isc_task_t *task,
			    isc_event_t **eventp);
/*%<
 * Send '*eventp' to 'task' when 'requestmgr' has completed shutdown.
 *
 * Notes:
 *
 *\li	It is not safe to detach the last reference to 'requestmgr' until
 *	shutdown is complete.
 *
 * Requires:
 *
 *\li	'requestmgr' is a valid request manager.
 *
 *\li	'task' is a valid task.
 *
 *\li	*eventp is a valid event.
 *
 * Ensures:
 *
 *\li	*eventp == NULL.
 */

void
dns_requestmgr_shutdown(dns_requestmgr_t *requestmgr);
/*%<
 * Start the shutdown process for 'requestmgr'.
 *
 * Notes:
 *
 *\li	This call has no effect if the request manager is already shutting
 *	down.
 *
 * Requires:
 *
 *\li	'requestmgr' is a valid requestmgr.
 */

void
dns_requestmgr_attach(dns_requestmgr_t *source, dns_requestmgr_t **targetp);
/*%<
 *	Attach to the request manager.  dns_requestmgr_shutdown() must not
 *	have been called on 'source' prior to calling dns_requestmgr_attach().
 *
 * Requires:
 *
 *\li	'source' is a valid requestmgr.
 *
 *\li	'targetp' to be non NULL and '*targetp' to be NULL.
 */

void
dns_requestmgr_detach(dns_requestmgr_t **requestmgrp);
/*%<
 *	Detach from the given requestmgr.  If this is the final detach
 *	requestmgr will be destroyed.  dns_requestmgr_shutdown() must
 *	be called before the final detach.
 *
 * Requires:
 *
 *\li	'*requestmgrp' is a valid requestmgr.
 *
 * Ensures:
 *\li	'*requestmgrp' is NULL.
 */

isc_result_t
dns_request_create(dns_requestmgr_t *requestmgr, dns_message_t *message,
		   isc_sockaddr_t *address, unsigned int options,
		   dns_tsigkey_t *key,
		   unsigned int timeout, isc_task_t *task,
		   isc_taskaction_t action, void *arg,
		   dns_request_t **requestp);
/*%<
 * Create and send a request.
 *
 * Notes:
 *
 *\li	'message' will be rendered and sent to 'address'.  If the
 *	#DNS_REQUESTOPT_TCP option i