FM / dns

/usr/include/dns

Name	Size	Mode	Actions
acl.h	6432	0644	edit dl rm
adb.h	18372	0644	edit dl rm
byaddr.h	4513	0644	edit dl rm
cache.h	7591	0644	edit dl rm
callbacks.h	2240	0644	edit dl rm
cert.h	1987	0644	edit dl rm
compress.h	6224	0644	edit dl rm
db.h	41302	0644	edit dl rm
dbiterator.h	7871	0644	edit dl rm
dbtable.h	3691	0644	edit dl rm
diff.h	7628	0644	edit dl rm
dispatch.h	13566	0644	edit dl rm
dlz.h	11152	0644	edit dl rm
dnssec.h	11101	0644	edit dl rm
ds.h	1912	0644	edit dl rm
dynamic_db.h	1892	0644	edit dl rm
enumclass.h	1787	0644	edit dl rm
enumtype.h	6729	0644	edit dl rm
events.h	3959	0644	edit dl rm
fixedname.h	2237	0644	edit dl rm
forward.h	3605	0644	edit dl rm
iptable.h	1922	0644	edit dl rm
journal.h	8473	0644	edit dl rm
keyflags.h	1803	0644	edit dl rm
keytable.h	10212	0644	edit dl rm
keyvalues.h	4318	0644	edit dl rm
lib.h	1718	0644	edit dl rm
log.h	4143	0644	edit dl rm
master.h	9396	0644	edit dl rm
masterdump.h	9657	0644	edit dl rm
message.h	37972	0644	edit dl rm
name.h	35862	0644	edit dl rm
ncache.h	5184	0644	edit dl rm
nsec.h	2328	0644	edit dl rm
peer.h	5437	0644	edit dl rm
portlist.h	2539	0644	edit dl rm
private.h	1912	0644	edit dl rm
rbt.h	34526	0644	edit dl rm
rcode.h	3003	0644	edit dl rm
rdata.h	21333	0644	edit dl rm
rdataclass.h	2317	0644	edit dl rm
rdatalist.h	2895	0644	edit dl rm
rdataset.h	19824	0644	edit dl rm
rdatasetiter.h	4455	0644	edit dl rm
rdataslab.h	4679	0644	edit dl rm
rdatastruct.h	77858	0644	edit dl rm
rdatatype.h	2371	0644	edit dl rm
request.h	10448	0644	edit dl rm
resolver.h	16248	0644	edit dl rm
result.h	8493	0644	edit dl rm
rootns.h	1429	0644	edit dl rm
rpz.h	5438	0644	edit dl rm
rrl.h	6995	0644	edit dl rm
sdb.h	7341	0644	edit dl rm
sdlz.h	14440	0644	edit dl rm
secalg.h	2235	0644	edit dl rm
secproto.h	2082	0644	edit dl rm
soa.h	2750	0644	edit dl rm
ssu.h	6773	0644	edit dl rm
tcpmsg.h	3649	0644	edit dl rm
time.h	2093	0644	edit dl rm
tkey.h	8145	0644	edit dl rm
tsig.h	8727	0644	edit dl rm
ttl.h	2126	0644	edit dl rm
types.h	12295	0644	edit dl rm
validator.h	7524	0644	edit dl rm
version.h	1207	0644	edit dl rm
view.h	29037	0644	edit dl rm
xfrin.h	3130	0644	edit dl rm
zone.h	46200	0644	edit dl rm
zonekey.h	1283	0644	edit dl rm
zt.h	4644	0644	edit dl rm

Edit: /usr/include/dns/resolver.h (16248B)

/*
 * Copyright (C) 2004-2011  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: resolver.h,v 1.67.86.2 2011-02-28 01:20:02 tbox Exp $ */

#ifndef DNS_RESOLVER_H
#define DNS_RESOLVER_H 1

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

/*! \file dns/resolver.h
 *
 * \brief
 * This is the BIND 9 resolver, the module responsible for resolving DNS
 * requests by iteratively querying authoritative servers and following
 * referrals.  This is a "full resolver", not to be confused with
 * the stub resolvers most people associate with the word "resolver".
 * The full resolver is part of the caching name server or resolver
 * daemon the stub resolver talks to.
 *
 * MP:
 *\li	The module ensures appropriate synchronization of data structures it
 *	creates and manipulates.
 *
 * Reliability:
 *\li	No anticipated impact.
 *
 * Resources:
 *\li	TBS
 *
 * Security:
 *\li	No anticipated impact.
 *
 * Standards:
 *\li	RFCs:	1034, 1035, 2181, TBS
 *\li	Drafts:	TBS
 */

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

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

ISC_LANG_BEGINDECLS

/*%
 * A dns_fetchevent_t is sent when a 'fetch' completes.  Any of 'db',
 * 'node', 'rdataset', and 'sigrdataset' may be bound.  It is the
 * receiver's responsibility to detach before freeing the event.
 * \brief
 * 'rdataset', 'sigrdataset', 'client' and 'id' are the values that were
 * supplied when dns_resolver_createfetch() was called.  They are returned
 *  to the caller so that they may be freed.
 */
typedef struct dns_fetchevent {
	ISC_EVENT_COMMON(struct dns_fetchevent);
	dns_fetch_t *			fetch;
	isc_result_t			result;
	dns_rdatatype_t			qtype;
	dns_db_t *			db;
	dns_dbnode_t *			node;
	dns_rdataset_t *		rdataset;
	dns_rdataset_t *		sigrdataset;
	dns_fixedname_t			foundname;
	isc_sockaddr_t *		client;
	dns_messageid_t			id;
	isc_result_t			vresult;
} dns_fetchevent_t;

/*
 * Options that modify how a 'fetch' is done.
 */
#define DNS_FETCHOPT_TCP		0x01	     /*%< Use TCP. */
#define DNS_FETCHOPT_UNSHARED		0x02	     /*%< See below. */
#define DNS_FETCHOPT_RECURSIVE		0x04	     /*%< Set RD? */
#define DNS_FETCHOPT_NOEDNS0		0x08	     /*%< Do not use EDNS. */
#define DNS_FETCHOPT_FORWARDONLY	0x10	     /*%< Only use forwarders. */
#define DNS_FETCHOPT_NOVALIDATE		0x20	     /*%< Disable validation. */
#define DNS_FETCHOPT_EDNS512		0x40	     /*%< Advertise a 512 byte
							  UDP buffer. */
#define DNS_FETCHOPT_WANTNSID           0x80         /*%< Request NSID */

#define	DNS_FETCHOPT_EDNSVERSIONSET	0x00800000
#define	DNS_FETCHOPT_EDNSVERSIONMASK	0xff000000
#define	DNS_FETCHOPT_EDNSVERSIONSHIFT	24

/*
 * Upper bounds of class of query RTT (ms).  Corresponds to
 * dns_resstatscounter_queryrttX statistics counters.
 */
#define DNS_RESOLVER_QRYRTTCLASS0	10
#define DNS_RESOLVER_QRYRTTCLASS0STR	"10"
#define DNS_RESOLVER_QRYRTTCLASS1	100
#define DNS_RESOLVER_QRYRTTCLASS1STR	"100"
#define DNS_RESOLVER_QRYRTTCLASS2	500
#define DNS_RESOLVER_QRYRTTCLASS2STR	"500"
#define DNS_RESOLVER_QRYRTTCLASS3	800
#define DNS_RESOLVER_QRYRTTCLASS3STR	"800"
#define DNS_RESOLVER_QRYRTTCLASS4	1600
#define DNS_RESOLVER_QRYRTTCLASS4STR	"1600"

/*
 * XXXRTH  Should this API be made semi-private?  (I.e.
 * _dns_resolver_create()).
 */

#define DNS_RESOLVER_CHECKNAMES		0x01
#define DNS_RESOLVER_CHECKNAMESFAIL	0x02

isc_result_t
dns_resolver_create(dns_view_t *view,
		    isc_taskmgr_t *taskmgr, unsigned int ntasks,
		    isc_socketmgr_t *socketmgr,
		    isc_timermgr_t *timermgr,
		    unsigned int options,
		    dns_dispatchmgr_t *dispatchmgr,
		    dns_dispatch_t *dispatchv4,
		    dns_dispatch_t *dispatchv6,
		    dns_resolver_t **resp);

/*%<
 * Create a resolver.
 *
 * Notes:
 *
 *\li	Generally, applications should not create a resolver directly, but
 *	should instead call dns_view_createresolver().
 *
 * Requires:
 *
 *\li	'view' is a valid view.
 *
 *\li	'taskmgr' is a valid task manager.
 *
 *\li	'ntasks' > 0.
 *
 *\li	'socketmgr' is a valid socket manager.
 *
 *\li	'timermgr' is a valid timer 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	resp != NULL && *resp == NULL.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS				On success.
 *
 *\li	Anything else				Failure.
 */

void
dns_resolver_freeze(dns_resolver_t *res);
/*%<
 * Freeze resolver.
 *
 * Notes:
 *
 *\li	Certain configuration changes cannot be made after the resolver
 *	is frozen.  Fetches cannot be created until the resolver is frozen.
 *
 * Requires:
 *
 *\li	'res' is a valid resolver.
 *
 * Ensures:
 *
 *\li	'res' is frozen.
 */

void
dns_resolver_prime(dns_resolver_t *res);
/*%<
 * Prime resolver.
 *
 * Notes:
 *
 *\li	Resolvers which have a forwarding policy other than dns_fwdpolicy_only
 *	need to be primed with the root nameservers, otherwise the root
 *	nameserver hints data may be used indefinitely.  This function requests
 *	that the resolver start a priming fetch, if it isn't already priming.
 *
 * Requires:
 *
 *\li	'res' is a valid, frozen resolver.
 */

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

void
dns_resolver_shutdown(dns_resolver_t *res);
/*%<
 * Start the shutdown process for 'res'.
 *
 * Notes:
 *
 *\li	This call has no effect if the resolver is already shutting down.
 *
 * Requires:
 *
 *\li	'res' is a valid resolver.
 */

void
dns_resolver_attach(dns_resolver_t *source, dns_resolver_t **targetp);

void
dns_resolver_detach(dns_resolver_t **resp);

isc_result_t
dns_resolver_createfetch(dns_resolver_t *res, dns_name_t *name,
			 dns_rdatatype_t type,
			 dns_name_t *domain, dns_rdataset_t *nameservers,
			 dns_forwarders_t *forwarders,
			 unsigned int options, isc_task_t *task,
			 isc_taskaction_t action, void *arg,
			 dns_rdataset_t *rdataset,
			 dns_rdataset_t *sigrdataset,
			 dns_fetch_t **fetchp);

isc_result_t
dns_resolver_createfetch2(dns_resolver_t *res, dns_name_t *name,
			  dns_rdatatype_t type,
			  dns_name_t *domain, dns_rdataset_t *nameservers,
			  dns_forwarders_t *forwarders,
			  isc_sockaddr_t *client, isc_uint16_t id,
			  unsigned int options, isc_task_t *task,
			  isc_taskaction_t action, void *arg,
			  dns_rdataset_t *rdataset,
			  dns_rdataset_t *sigrdataset,
			  dns_fetch_t **fetchp);
isc_result_t
dns_resolver_createfetch3(dns_resolver_t *res, dns_name_t *name,
			  dns_rdatatype_t type,
			  dns_name_t *domain, dns_rdataset_t *nameservers,
			  dns_forwarders_t *forwarders,
			  isc_sockaddr_t *client, isc_uint16_t id,
			  unsigned int options, unsigned int depth,
			  isc_counter_t *qc, isc_task_t *task,
			  isc_taskaction_t action, void *arg,
			  dns_rdataset_t *rdataset,
			  dns_rdataset_t *sigrdataset,
			  dns_fetch_t **fetchp);
/*%<
 * Recurse to answer a question.
 *
 * Notes:
 *
 *\li	This call starts a query for 'name', type 'type'.
 *
 *\li	The 'domain' is a parent domain of 'name' for which
 *	a set of name servers 'nameservers' is known.  If no
 *	such name server information is available, set
 * 	'domain' and 'nameservers' to NULL.
 *
 *\li	'forwarders' is unimplemented, and subject to change when
 *	we figure out how selective forwarding will work.
 *
 *\li	When the fetch completes (successfully or otherwise), a
 *	#DNS_EVENT_FETCHDONE event with action 'action' and arg 'arg' will be
 *	posted to 'task'.
 *
 *\li	The values of 'rdataset' and 'sigrdataset' will be returned in
 *	the FETCHDONE event.
 *
 *\li	'client' and 'id' are used for duplicate query detection.  '*client'
 *	must remain stable until after 'action' has been called or
 *	dns_resolver_cancelfetch() is called.
 *
 * Requires:
 *
 *\li	'res' is a valid resolver that has been frozen.
 *
 *\li	'name' is a valid name.
 *
 *\li	'type' is not a meta type other than ANY.
 *
 *\li	'domain' is a valid name or NULL.
 *
 *\li	'nameservers' is a valid NS rdataset (whose owner name is 'domain')
 *	iff. 'domain' is not NULL.
 *
 *\li	'forwarders' is NULL.
 *
 *\li	'client' is a valid sockaddr or NULL.
 *
 *\li	'options' contains valid options.
 *
 *\li	'rdataset' is a valid, disassociated rdataset.
 *
 *\li	'sigrdataset' is NULL, or is a valid, disassociated rdataset.
 *
 *\li	fetchp != NULL && *fetchp == NULL.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS					Success
 *\li	#DNS_R_DUPLICATE
 *\li	#DNS_R_DROP
 *
 *\li	Many other values are possible, all of which indicate failure.
 */

void
dns_resolver_cancelfetch(dns_fetch_t *fetch);
/*%<
 * Cancel 'fetch'.
 *
 * Notes:
 *
 *\li	If 'fetch' has not completed, post its FETCHDONE event with a
 *	result code of #ISC_R_CANCELED.
 *
 * Requires:
 *
 *\li	'fetch' is a valid fetch.
 */

void
dns_resolver_destroyfetch(dns_fetch_t **fetchp);
/*%<
 * Destroy 'fetch'.
 *
 * Requires:
 *
 *\li	'*fetchp' is a valid fetch.
 *
 *\li	The caller has received the FETCHDONE event (either because the
 *	fetch completed or because dns_resolver_cancelfetch() was called).
 *
 * Ensures:
 *
 *\li	*fetchp == NULL.
 */

void
dns_resolver_logfetch(dns_fetch_t *fetch, isc_log_t *lctx,
		      isc_logcategory_t *category, isc_logmodule_t *module,
		      int level, isc_boolean_t duplicateok);
/*%<
 * Dump a log message on internal state at the completion of given 'fetch'.
 * 'lctx', 'category', 'module', and 'level' are used to write the log message.
 * By default, only one log message is written even if the corresponding fetch
 * context serves multiple clients; if 'duplicateok' is true the suppression
 * is disabled and the message can be written every time this function is
 * called.
 *
 * Requires:
 *
 *\li	'fetch' is a valid fetch, and has completed.
 */

dns_dispatchmgr_t *
dns_resolver_dispatchmgr(dns_resolver_t *resolver);

dns_dispatch_t *
dns_resolver_dispatchv4(dns_resolver_t *resolver);

dns_dispatch_t *
dns_resolver_dispatchv6(dns_resolver_t *resolver);

isc_socketmgr_t *
dns_resolver_socketmgr(dns_resolver_t *resolver);

isc_taskmgr_t *
dns_resolver_taskmgr(dns_resolver_t *resolver);

isc_uint32_t
dns_resolver_getlamettl(dns_resolver_t *resolver);
/*%<
 * Get the resolver's lame-ttl.  zero => no lame processing.
 *
 * Requires:
 *\li	'resolver' to be valid.
 */

void
dns_resolver_setlamettl(dns_resolver_t *resolver, isc_uint32_t lame_ttl);
/*%<
 * Set the resolver's lame-ttl.  zero => no lame processing.
 *
 * Requires:
 *\li	'resolver' to be valid.
 */

unsigned int
dns_resolver_nrunning(dns_resolver_t *resolver);
/*%<
 * Return the number of currently running resolutions in this
 * resolver.  This is may be less than the number of outstanding
 * fetches due to multiple identical fetches, or more than the
 * number of of outstanding fetches due to the fact that resolution
 * can continue even though a fetch has been canceled.
 */

isc_result_t
dns_resolver_addalternate(dns_resolver_t *resolver, isc_sockaddr_t *alt,
			  dns_name_t *name, in_port_t port);
/*%<
 * Add alternate addresses to be tried in the event that the nameservers
 * for a zone are not available in the address families supported by the
 * operating system.
 *
 * Require:
 * \li	only one of 'name' or 'alt' to be valid.
 */

void
dns_resolver_setudpsize(dns_resolver_t *resolver, isc_uint16_t udpsize);
/*%<
 * Set the EDNS UDP buffer size advertised by the server.
 */

isc_uint16_t
dns_resolver_getudpsize(dns_resolver_t *resolver);
/*%<
 * Get the current EDNS UDP buffer size.
 */

void
dns_resolver_reset_algorithms(dns_resolver_t *resolver);
/*%<
 * Clear the disabled DNSSEC algorithms.
 */

isc_result_t
dns_resolver_disable_algorithm(dns_resolver_t *resolver, dns_name_t *name,
			       unsigned int alg);
/*%<
 * Mark the give DNSSEC algorithm as disabled and below 'name'.
 * Valid algorithms are less than 256.
 *
 * Returns:
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_RANGE
 *\li	#ISC_R_NOMEMORY
 */

isc_boolean_t
dns_resolver_algorithm_supported(dns_resolver_t *resolver, dns_name_t *name,
				 unsigned int alg);
/*%<
 * Check if the given algorithm is supported by this resolver.
 * This checks if the algorithm has been disabled via
 * dns_resolver_disable_algorithm() then the underlying
 * crypto libraries if not specifically disabled.
 */

isc_boolean_t
dns_resolver_digest_supported(dns_resolver_t *resolver, unsigned int digest_type);
/*%<
 * Is this digest type supported.
 */

void
dns_resolver_resetmustbesecure(dns_resolver_t *resolver);

isc_result_t
dns_resolver_setmustbesecure(dns_resolver_t *resolver, dns_name_t *name,
			     isc_boolean_t value);

isc_boolean_t
dns_resolver_getmustbesecure(dns_resolver_t *resolver, dns_name_t *name);

void
dns_resolver_settimeout(dns_resolver_t *resolver, unsigned int seconds);
/*%<
 * Set the length of time the resolver will work on a query, in seconds.
 *
 * If timeout is 0, the default timeout will be applied.
 *
 * Requires:
 * \li  resolver to be valid.
 */

unsigned int
dns_resolver_gettimeout(dns_resolver_t *resolver);
/*%<
 * Get the current length of time the resolver will work on a query, in seconds.
 *
 * Requires:
 * \li  resolver to be valid.
 */

void
dns_resolver_setclientsperquery(dns_resolver_t *resolver,
				isc_uint32_t min, isc_uint32_t max);

void
dns_resolver_getclientsperquery(dns_resolver_t *resolver, isc_uint32_t *cur,
				isc_uint32_t *min, isc_uint32_t *max);

isc_boolean_t
dns_resolver_getzeronosoattl(dns_resolver_t *resolver);

void
dns_resolver_setzeronosoattl(dns_resolver_t *resolver, isc_boolean_t state);

unsigned int
dns_resolver_getoptions(dns_resolver_t *resolver);

void
dns_resolver_addbadcache(dns_resolver_t *resolver, dns_name_t *name,
			 dns_rdatatype_t type, isc_time_t *expire);
/*%<
 * Add a entry to the bad cache for <name,type> that will expire at 'expire'.
 *
 * Requires:
 * \li	resolver to be valid.
 * \li	name to be valid.
 */

isc_boolean_t
dns_resolver_getbadcache(dns_resolver_t *resolver, dns_name_t *name,
			 dns_rdatatype_t type, isc_time_t *now);
/*%<
 * Check to see if there is a unexpired entry in the bad cache for
 * <name,type>.
 *
 * Requires:
 * \li	resolver to be valid.
 * \li	name to be valid.
 */

void
dns_resolver_flushbadcache(dns_resolver_t *resolver, dns_name_t *name);
/*%<
 * Flush the bad cache of all entries at 'name' if 'name' is non NULL.
 * Flush the entire bad cache if 'name' is NULL.
 *
 * Requires:
 * \li	resolver to be valid.
 */

void
dns_resolver_printbadcache(dns_resolver_t *resolver, FILE *fp);
/*%
 * Print out the contents of the bad cache to 'fp'.
 *
 * Requires:
 * \li	resolver to be valid.
 */

void
dns_resolver_setmaxdepth(dns_resolver_t *resolver, unsigned int maxdepth);
unsigned int
dns_resolver_getmaxdepth(dns_resolver_t *resolver);
/*%
 * Get and set how many NS indirections will be followed when looking for
 * nameserver addresses.
 *
 * Requires:
 * \li	resolver to be valid.
 */

void
dns_resolver_setmaxqueries(dns_resolver_t *resolver, unsigned int queries);
unsigned int
dns_resolver_getmaxqueries(dns_resolver_t *resolver);
/*%
 * Get and set how many iterative queries will be allowed before
 * terminating a recursive query.
 *
 * Requires:
 * \li	resolver to be valid.
 */

ISC_LANG_ENDDECLS

#endif /* DNS_RESOLVER_H */

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