FM / dns

/usr/include/bind9/dns

Name	Size	Mode	Actions
acache.h	14232	0644	edit dl rm
acl.h	7242	0644	edit dl rm
adb.h	22595	0644	edit dl rm
badcache.h	3369	0644	edit dl rm
bit.h	807	0644	edit dl rm
byaddr.h	4002	0644	edit dl rm
cache.h	8643	0644	edit dl rm
callbacks.h	2271	0644	edit dl rm
catz.h	11833	0644	edit dl rm
cert.h	1466	0644	edit dl rm
client.h	22042	0644	edit dl rm
clientinfo.h	2006	0644	edit dl rm
compress.h	6646	0644	edit dl rm
db.h	47061	0644	edit dl rm
dbiterator.h	7422	0644	edit dl rm
dbtable.h	3165	0644	edit dl rm
diff.h	6980	0644	edit dl rm
dispatch.h	16427	0644	edit dl rm
dlz.h	10618	0644	edit dl rm
dlz_dlopen.h	4677	0644	edit dl rm
dns64.h	5635	0644	edit dl rm
dnssec.h	12371	0644	edit dl rm
dnstap.h	9364	0644	edit dl rm
ds.h	1225	0644	edit dl rm
dsdigest.h	1722	0644	edit dl rm
dyndb.h	4835	0644	edit dl rm
ecdb.h	809	0644	edit dl rm
edns.h	722	0644	edit dl rm
enumclass.h	1220	0644	edit dl rm
enumtype.h	8300	0644	edit dl rm
events.h	4059	0644	edit dl rm
fixedname.h	1663	0644	edit dl rm
forward.h	3452	0644	edit dl rm
geoip.h	2792	0644	edit dl rm
ipkeylist.h	2186	0644	edit dl rm
iptable.h	1621	0644	edit dl rm
journal.h	8227	0644	edit dl rm
keydata.h	1059	0644	edit dl rm
keyflags.h	1278	0644	edit dl rm
keytable.h	9462	0644	edit dl rm
keyvalues.h	4159	0644	edit dl rm
lib.h	1192	0644	edit dl rm
log.h	3964	0644	edit dl rm
lookup.h	2924	0644	edit dl rm
master.h	11289	0644	edit dl rm
masterdump.h	12647	0644	edit dl rm
message.h	39023	0644	edit dl rm
name.h	37115	0644	edit dl rm
ncache.h	4929	0644	edit dl rm
nsec.h	3397	0644	edit dl rm
nsec3.h	8032	0644	edit dl rm
nta.h	4548	0644	edit dl rm
opcode.h	1007	0644	edit dl rm
order.h	1999	0644	edit dl rm
peer.h	5966	0644	edit dl rm
portlist.h	2101	0644	edit dl rm
private.h	1935	0644	edit dl rm
rbt.h	40618	0644	edit dl rm
rcode.h	2481	0644	edit dl rm
rdata.h	21613	0644	edit dl rm
rdataclass.h	2257	0644	edit dl rm
rdatalist.h	2569	0644	edit dl rm
rdataset.h	21536	0644	edit dl rm
rdatasetiter.h	3926	0644	edit dl rm
rdataslab.h	4528	0644	edit dl rm
rdatastruct.h	61584	0644	edit dl rm
rdatatype.h	2298	0644	edit dl rm
request.h	11156	0644	edit dl rm
resolver.h	20227	0644	edit dl rm
result.h	9284	0644	edit dl rm
rootns.h	892	0644	edit dl rm
rpz.h	10335	0644	edit dl rm
rriterator.h	4230	0644	edit dl rm
rrl.h	6640	0644	edit dl rm
sdb.h	7224	0644	edit dl rm
sdlz.h	14214	0644	edit dl rm
secalg.h	1706	0644	edit dl rm
secproto.h	1557	0644	edit dl rm
soa.h	2186	0644	edit dl rm
ssu.h	8308	0644	edit dl rm
stats.h	13451	0644	edit dl rm
tcpmsg.h	3145	0644	edit dl rm
time.h	1695	0644	edit dl rm
timer.h	1051	0644	edit dl rm
tkey.h	7631	0644	edit dl rm
tsec.h	2949	0644	edit dl rm
tsig.h	8384	0644	edit dl rm
ttl.h	1945	0644	edit dl rm
types.h	14212	0644	edit dl rm
update.h	1653	0644	edit dl rm
validator.h	7161	0644	edit dl rm
version.h	868	0644	edit dl rm
view.h	35274	0644	edit dl rm
xfrin.h	2924	0644	edit dl rm
zone.h	60864	0644	edit dl rm
zonekey.h	777	0644	edit dl rm
zt.h	5562	0644	edit dl rm

Edit: /usr/include/bind9/dns/client.h (22042B)

/*
 * 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 https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef DNS_CLIENT_H
#define DNS_CLIENT_H 1

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

/*! \file
 *
 * \brief
 * The DNS client module provides convenient programming interfaces to various
 * DNS services, such as name resolution with or without DNSSEC validation or
 * dynamic DNS update.  This module is primarily expected to be used by other
 * applications than BIND9-related ones that need such advanced DNS features.
 *
 * MP:
 *\li	In the typical usage of this module, application threads will not share
 *	the same data structures created and manipulated in this module.
 *	However, the module still ensures appropriate synchronization of such
 *	data structures.
 *
 * Resources:
 *\li	TBS
 *
 * Security:
 *\li	This module does not handle any low-level data directly, and so no
 *	security issue specific to this module is anticipated.
 */

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

#include <dns/tsig.h>
#include <dns/types.h>

#include <dst/dst.h>

typedef enum {
	updateop_none = 0,
	updateop_add = 1,
	updateop_delete = 2,
	updateop_exist = 3,
	updateop_notexist = 4,
	updateop_max = 5
} dns_client_updateop_t;

ISC_LANG_BEGINDECLS

/***
 *** Types
 ***/

/*%
 * Optional flags for dns_client_create(x).
 */
/*%< Enable caching resolution results (experimental). */
#define DNS_CLIENTCREATEOPT_USECACHE	0x8000

/*%
 * Optional flags for dns_client_(start)resolve.
 */
/*%< Do not return DNSSEC data (e.g. RRSIGS) with response. */
#define DNS_CLIENTRESOPT_NODNSSEC	0x01
/*%< Allow running external context. */
#define DNS_CLIENTRESOPT_ALLOWRUN	0x02
/*%< Don't validate responses. */
#define DNS_CLIENTRESOPT_NOVALIDATE	0x04
/*%< Don't set the CD flag on upstream queries. */
#define DNS_CLIENTRESOPT_NOCDFLAG	0x08
/*%< Use TCP transport. */
#define DNS_CLIENTRESOPT_TCP		0x10

/*%
 * Optional flags for dns_client_(start)request.
 */
/*%< Allow running external context. */
#define DNS_CLIENTREQOPT_ALLOWRUN	0x01
/*%< Use TCP transport. */
#define DNS_CLIENTREQOPT_TCP		0x02

/*%
 * Optional flags for dns_client_(start)update.
 */
/*%< Allow running external context. */
#define DNS_CLIENTUPDOPT_ALLOWRUN	0x01
/*%< Use TCP transport. */
#define DNS_CLIENTUPDOPT_TCP		0x02

/*%
 * A dns_clientresevent_t is sent when name resolution performed by a client
 * completes.  'result' stores the result code of the entire resolution
 * procedure.  'vresult' specifically stores the result code of DNSSEC
 * validation if it is performed.  When name resolution successfully completes,
 * 'answerlist' is typically non empty, containing answer names along with
 * RRsets.  It is the receiver's responsibility to free this list by calling
 * dns_client_freeresanswer() before freeing the event structure.
 */
typedef struct dns_clientresevent {
	ISC_EVENT_COMMON(struct dns_clientresevent);
	isc_result_t	result;
	isc_result_t	vresult;
	dns_namelist_t	answerlist;
} dns_clientresevent_t;		/* too long? */

/*%
 * Status of a dynamic update procedure.
 */
typedef enum {
	dns_clientupdatestate_prepare,	/*%< no updates have been sent */
	dns_clientupdatestate_sent,	/*%< updates were sent, no response */
	dns_clientupdatestate_done	/*%< update was sent and succeeded */
} dns_clientupdatestate_t;

/*%
 * A dns_clientreqevent_t is sent when a DNS request is completed by a client.
 * 'result' stores the result code of the entire transaction.
 * If the transaction is successfully completed but the response packet cannot
 * be parsed, 'result' will store the result code of dns_message_parse().
 * If the response packet is received, 'rmessage' will contain the response
 * message, whether it is successfully parsed or not.
 */
typedef struct dns_clientreqevent {
	ISC_EVENT_COMMON(struct dns_clientreqevent);
	isc_result_t	result;
	dns_message_t	*rmessage;
} dns_clientreqevent_t;		/* too long? */

/*%
 * A dns_clientupdateevent_t is sent when dynamic update performed by a client
 * completes.  'result' stores the result code of the entire update procedure.
 * 'state' specifies the status of the update procedure when this event is
 * sent.  This can be used as a hint by the receiver to determine whether
 * the update attempt was ever made.  In particular, if the state is
 * dns_clientupdatestate_prepare, the receiver can be sure that the requested
 * update was not applied.
 */
typedef struct dns_clientupdateevent {
	ISC_EVENT_COMMON(struct dns_clientupdateevent);
	isc_result_t		result;
	dns_clientupdatestate_t	state;
} dns_clientupdateevent_t;	/* too long? */

isc_result_t
dns_client_create(dns_client_t **clientp, unsigned int options);

isc_result_t
dns_client_createx(isc_mem_t *mctx, isc_appctx_t *actx, isc_taskmgr_t *taskmgr,
		   isc_socketmgr_t *socketmgr, isc_timermgr_t *timermgr,
		   unsigned int options, dns_client_t **clientp);

isc_result_t
dns_client_createx2(isc_mem_t *mctx, isc_appctx_t *actx,
	   isc_taskmgr_t *taskmgr, isc_socketmgr_t *socketmgr,
	   isc_timermgr_t *timermgr, unsigned int options,
	   dns_client_t **clientp,
	   isc_sockaddr_t *localaddr4, isc_sockaddr_t *localaddr6);
/*%<
 * Create a DNS client.  These functions create a new client object with
 * minimal internal resources such as the default 'view' for the IN class and
 * IPv4/IPv6 dispatches for the view.
 *
 * dns_client_createx() takes 'manager' arguments so that the caller can
 * control the behavior of the client through the underlying event framework.
 * On the other hand, dns_client_create() simplifies the interface and creates
 * the managers internally.  A DNS client object created via
 * dns_client_create() is expected to be used by an application that only needs
 * simple synchronous services or by a thread-based application.
 *
 * dns_client_createx2 takes two additional parameters, 'localaddr4' and
 * 'localaddr6', to specify the local address to use for each family. If
 * both are set to NULL, then wildcard addresses will be used for both
 * families. If only one is NULL, then the other address will be used
 * as the local address, and the other protocol family will not be used.
 *
 * If the DNS_CLIENTCREATEOPT_USECACHE flag is set in 'options',
 * dns_client_create(x) will create a cache database with the view.
 *
 * Requires:
 *
 *\li	'mctx' is a valid memory context.
 *
 *\li	'actx' is a valid application context.
 *
 *\li	'taskmgr' is a valid task manager.
 *
 *\li	'socketmgr' is a valid socket manager.
 *
 *\li	'timermgr' is a valid timer manager.
 *
 *\li	clientp != NULL && *clientp == NULL.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

void
dns_client_destroy(dns_client_t **clientp);
/*%<
 * Destroy 'client'.
 *
 * Requires:
 *
 *\li	'*clientp' is a valid client.
 *
 * Ensures:
 *
 *\li	*clientp == NULL.
 */

isc_result_t
dns_client_setservers(dns_client_t *client, dns_rdataclass_t rdclass,
		      dns_name_t *name_space, isc_sockaddrlist_t *addrs);
/*%<
 * Specify a list of addresses of recursive name servers that the client will
 * use for name resolution.  A view for the 'rdclass' class must be created
 * beforehand.  If 'name_space' is non NULL, the specified server will be used
 * if and only if the query name is a subdomain of 'name_space'.  When servers
 * for multiple 'name_space's are provided, and a query name is covered by
 * more than one 'name_space', the servers for the best (longest) matching
 * name_space will be used.  If 'name_space' is NULL, it works as if
 * dns_rootname (.) were specified.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 *\li	'name_space' is NULL or a valid name.
 *
 *\li	'addrs' != NULL.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

isc_result_t
dns_client_clearservers(dns_client_t *client, dns_rdataclass_t rdclass,
			dns_name_t *name_space);
/*%<
 * Remove configured recursive name servers for the 'rdclass' and 'name_space'
 * from the client.  See the description of dns_client_setservers() for
 * the requirements about 'rdclass' and 'name_space'.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 *\li	'name_space' is NULL or a valid name.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

isc_result_t
dns_client_setdlv(dns_client_t *client, dns_rdataclass_t rdclass,
		  const char *dlvname);
/*%<
 * Specify a name to use for DNSSEC lookaside validation.
 * If a trusted key has been added for that name, then DLV will be
 * used during validation.  If 'dlvname' is NULL, then DLV will no
 * longer be used for this client.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

isc_result_t
dns_client_resolve(dns_client_t *client, dns_name_t *name,
		   dns_rdataclass_t rdclass, dns_rdatatype_t type,
		   unsigned int options, dns_namelist_t *namelist);

isc_result_t
dns_client_startresolve(dns_client_t *client, dns_name_t *name,
			dns_rdataclass_t rdclass, dns_rdatatype_t type,
			unsigned int options, isc_task_t *task,
			isc_taskaction_t action, void *arg,
			dns_clientrestrans_t **transp);
/*%<
 * Perform name resolution for 'name', 'rdclass', and 'type'.
 *
 * If any trusted keys are configured and the query name is considered to
 * belong to a secure zone, these functions also validate the responses
 * using DNSSEC by default.  If the DNS_CLIENTRESOPT_NOVALIDATE flag is set
 * in 'options', DNSSEC validation is disabled regardless of the configured
 * trusted keys or the query name. With DNS_CLIENTRESOPT_NODNSSEC
 * DNSSEC data is not returned with response. DNS_CLIENTRESOPT_NOCDFLAG
 * disables the CD flag on queries, DNS_CLIENTRESOPT_TCP switches to
 * the TCP (vs. UDP) transport.
 *
 * dns_client_resolve() provides a synchronous service.  This function starts
 * name resolution internally and blocks until it completes.  On success,
 * 'namelist' will contain a list of answer names, each of which has
 * corresponding RRsets.  The caller must provide a valid empty list, and
 * is responsible for freeing the list content via dns_client_freeresanswer().
 * If the name resolution fails due to an error in DNSSEC validation,
 * dns_client_resolve() returns the result code indicating the validation
 * error. Otherwise, it returns the result code of the entire resolution
 * process, either success or failure.
 *
 * It is typically expected that the client object passed to
 * dns_client_resolve() was created via dns_client_create() and has its own
 * managers and contexts.  However, if the DNS_CLIENTRESOPT_ALLOWRUN flag is
 * set in 'options', this function performs the synchronous service even if
 * it does not have its own manager and context structures.
 *
 * dns_client_startresolve() is an asynchronous version of dns_client_resolve()
 * and does not block.  When name resolution is completed, 'action' will be
 * called with the argument of a 'dns_clientresevent_t' object, which contains
 * the resulting list of answer names (on success).  On return, '*transp' is
 * set to an opaque transaction ID so that the caller can cancel this
 * resolution process.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 *\li	'addrs' != NULL.
 *
 *\li	'name' is a valid name.
 *
 *\li	'namelist' != NULL and is not empty.
 *
 *\li	'task' is a valid task.
 *
 *\li	'transp' != NULL && *transp == NULL;
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

void
dns_client_cancelresolve(dns_clientrestrans_t *trans);
/*%<
 * Cancel an ongoing resolution procedure started via
 * dns_client_startresolve().
 *
 * Notes:
 *
 *\li	If the resolution procedure has not completed, post its CLIENTRESDONE
 *	event with a result code of #ISC_R_CANCELED.
 *
 * Requires:
 *
 *\li	'trans' is a valid transaction ID.
 */

void
dns_client_destroyrestrans(dns_clientrestrans_t **transp);
/*%<
 * Destroy name resolution transaction state identified by '*transp'.
 *
 * Requires:
 *
 *\li	'*transp' is a valid transaction ID.
 *
 *\li	The caller has received the CLIENTRESDONE event (either because the
 *	resolution completed or because dns_client_cancelresolve() was called).
 *
 * Ensures:
 *
 *\li	*transp == NULL.
 */

void
dns_client_freeresanswer(dns_client_t *client, dns_namelist_t *namelist);
/*%<
 * Free resources allocated for the content of 'namelist'.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 *\li	'namelist' != NULL.
 */

isc_result_t
dns_client_addtrustedkey(dns_client_t *client, dns_rdataclass_t rdclass,
			 dns_name_t *keyname, isc_buffer_t *keydatabuf);
/*%<
 * Add a DNSSEC trusted key for the 'rdclass' class.  A view for the 'rdclass'
 * class must be created beforehand.  'keyname' is the DNS name of the key,
 * and 'keydatabuf' stores the resource data of the key.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 *\li	'keyname' is a valid name.
 *
 *\li	'keydatabuf' is a valid buffer.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

isc_result_t
dns_client_request(dns_client_t *client, dns_message_t *qmessage,
		   dns_message_t *rmessage, isc_sockaddr_t *server,
		   unsigned int options, unsigned int parseoptions,
		   dns_tsec_t *tsec, unsigned int timeout,
		   unsigned int udptimeout, unsigned int udpretries);

isc_result_t
dns_client_startrequest(dns_client_t *client, dns_message_t *qmessage,
			dns_message_t *rmessage, isc_sockaddr_t *server,
			unsigned int options, unsigned int parseoptions,
			dns_tsec_t *tsec, unsigned int timeout,
			unsigned int udptimeout, unsigned int udpretries,
			isc_task_t *task, isc_taskaction_t action, void *arg,
			dns_clientreqtrans_t **transp);

/*%<
 * Send a DNS request containing a query message 'query' to 'server'.
 *
 * 'parseoptions' will be used when the response packet is parsed, and will be
 * passed to dns_message_parse() via dns_request_getresponse().  See
 * dns_message_parse() for more details.
 *
 * 'tsec' is a transaction security object containing, e.g. a TSIG key for
 * authenticating the request/response transaction.  This is optional and can
 * be NULL, in which case this library performs the transaction  without any
 * transaction authentication.
 *
 * 'timeout', 'udptimeout', and 'udpretries' are passed to
 * dns_request_createvia3().  See dns_request_createvia3() for more details.
 *
 * dns_client_request() provides a synchronous service.  This function sends
 * the request and blocks until a response is received.  On success,
 * 'rmessage' will contain the response message.  The caller must provide a
 * valid initialized message.
 *
 * It is usually expected that the client object passed to
 * dns_client_request() was created via dns_client_create() and has its own
 * managers and contexts.  However, if the DNS_CLIENTREQOPT_ALLOWRUN flag is
 * set in 'options', this function performs the synchronous service even if
 * it does not have its own manager and context structures.
 *
 * dns_client_startrequest() is an asynchronous version of dns_client_request()
 * and does not block.  When the transaction is completed, 'action' will be
 * called with the argument of a 'dns_clientreqevent_t' object, which contains
 * the response message (on success).  On return, '*transp' is set to an opaque
 * transaction ID so that the caller can cancel this request.
 *
 * DNS_CLIENTREQOPT_TCP switches to the TCP (vs. UDP) transport.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 *\li	'qmessage' and 'rmessage' are valid initialized message.
 *
 *\li	'server' is a valid socket address structure.
 *
 *\li	'task' is a valid task.
 *
 *\li	'transp' != NULL && *transp == NULL;
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 *
 *\li	Any result that dns_message_parse() can return.
 */

void
dns_client_cancelrequest(dns_clientreqtrans_t *transp);
/*%<
 * Cancel an ongoing DNS request procedure started via
 * dns_client_startrequest().
 *
 * Notes:
 *
 *\li	If the request procedure has not completed, post its CLIENTREQDONE
 *	event with a result code of #ISC_R_CANCELED.
 *
 * Requires:
 *
 *\li	'trans' is a valid transaction ID.
 */

void
dns_client_destroyreqtrans(dns_clientreqtrans_t **transp);
/*%
 * Destroy DNS request transaction state identified by '*transp'.
 *
 * Requires:
 *
 *\li	'*transp' is a valid transaction ID.
 *
 *\li	The caller has received the CLIENTREQDONE event (either because the
 *	request completed or because dns_client_cancelrequest() was called).
 *
 * Ensures:
 *
 *\li	*transp == NULL.
 */

isc_result_t
dns_client_update(dns_client_t *client, dns_rdataclass_t rdclass,
		  dns_name_t *zonename, dns_namelist_t *prerequisites,
		  dns_namelist_t *updates, isc_sockaddrlist_t *servers,
		  dns_tsec_t *tsec, unsigned int options);

isc_result_t
dns_client_startupdate(dns_client_t *client, dns_rdataclass_t rdclass,
		       dns_name_t *zonename, dns_namelist_t *prerequisites,
		       dns_namelist_t *updates, isc_sockaddrlist_t *servers,
		       dns_tsec_t *tsec, unsigned int options,
		       isc_task_t *task, isc_taskaction_t action, void *arg,
		       dns_clientupdatetrans_t **transp);
/*%<
 * Perform DNS dynamic update for 'updates' of the 'rdclass' class with
 * optional 'prerequisites'.
 *
 * 'updates' are a list of names with associated RRsets to be updated.
 *
 * 'prerequisites' are a list of names with associated RRsets corresponding to
 * the prerequisites of the updates.  This is optional and can be NULL, in
 * which case the prerequisite section of the update message will be empty.
 *
 * Both 'updates' and 'prerequisites' must be constructed as specified in
 * RFC2136.
 *
 * 'zonename' is the name of the zone in which the updated names exist.
 * This is optional and can be NULL.  In this case, these functions internally
 * identify the appropriate zone through some queries for the SOA RR starting
 * with the first name in prerequisites or updates.
 *
 * 'servers' is a list of authoritative servers to which the update message
 * should be sent.  This is optional and can be NULL.  In this case, these
 * functions internally identify the appropriate primary server name and its
 * addresses through some queries for the SOA RR (like the case of zonename)
 * and supplemental A/AAAA queries for the server name.
 * Note: The client module generally assumes the given addresses are of the
 * primary server of the corresponding zone.  It will work even if a secondary
 * server address is specified as long as the server allows update forwarding,
 * it is generally discouraged to include secondary server addresses unless
 * there's strong reason to do so.
 *
 * 'tsec' is a transaction security object containing, e.g. a TSIG key for
 * authenticating the update transaction (and the supplemental query/response
 * transactions if the server is specified).  This is optional and can be
 * NULL, in which case the library tries the update without any transaction
 * authentication.
 *
 * It is typically expected that the client object passed to
 * dns_client_update() was created via dns_client_create() and has its own
 * managers and contexts.  However, if the DNS_CLIENTUPDOPT_ALLOWRUN flag is
 * set in 'options', this function performs the synchronous service even if
 * it does not have its own manager and context structures.
 *
 * dns_client_update() provides a synchronous service.  This function blocks
 * until the entire update procedure completes, including the additional
 * queries when necessary.
 *
 * dns_client_startupdate() is an asynchronous version of dns_client_update().
 * It immediately returns (typically with *transp being set to a non-NULL
 * pointer), and performs the update procedure through a set of internal
 * events.  All transactions including the additional query exchanges are
 * performed as a separate event, so none of these events cause blocking
 * operation.  When the update procedure completes, the specified function
 * 'action' will be called with the argument of a 'dns_clientupdateevent_t'
 * structure.  On return, '*transp' is set to an opaque transaction ID so that
 * the caller can cancel this update process.
 *
 * DNS_CLIENTUPDOPT_TCP switches to the TCP (vs. UDP) transport.
 *
 * Requires:
 *
 *\li	'client' is a valid client.
 *
 *\li	'updates' != NULL.
 *
 *\li	'task' is a valid task.
 *
 *\li	'transp' != NULL && *transp == NULL;
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

void
dns_client_cancelupdate(dns_clientupdatetrans_t *trans);
/*%<
 * Cancel an ongoing dynamic update procedure started via
 * dns_client_startupdate().
 *
 * Notes:
 *
 *\li	If the update procedure has not completed, post its UPDATEDONE
 *	event with a result code of #ISC_R_CANCELED.
 *
 * Requires:
 *
 *\li	'trans' is a valid transaction ID.
 */

void
dns_client_destroyupdatetrans(dns_clientupdatetrans_t **transp);
/*%<
 * Destroy dynamic update transaction identified by '*transp'.
 *
 * Requires:
 *
 *\li	'*transp' is a valid transaction ID.
 *
 *\li	The caller has received the UPDATEDONE event (either because the
 *	update completed or because dns_client_cancelupdate() was called).
 *
 * Ensures:
 *
 *\li	*transp == NULL.
 */

isc_result_t
dns_client_updaterec(dns_client_updateop_t op, dns_name_t *owner,
		     dns_rdatatype_t type, dns_rdata_t *source,
		     dns_ttl_t ttl, dns_name_t *target,
		     dns_rdataset_t *rdataset, dns_rdatalist_t *rdatalist,
		     dns_rdata_t *rdata, isc_mem_t *mctx);
/*%<
 * TBD
 */

void
dns_client_freeupdate(dns_name_t **namep);
/*%<
 * TBD
 */

isc_mem_t *
dns_client_mctx(dns_client_t *client);

ISC_LANG_ENDDECLS

#endif /* DNS_CLIENT_H */

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