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/adb.h (18372B)

/*
 * Copyright (C) 2004-2008, 2011  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2003  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: adb.h,v 1.85.594.3 2011-12-05 16:58:08 each Exp $ */

#ifndef DNS_ADB_H
#define DNS_ADB_H 1

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

/*! \file dns/adb.h
 *\brief
 * DNS Address Database
 *
 * This module implements an address database (ADB) for mapping a name
 * to an isc_sockaddr_t. It also provides statistical information on
 * how good that address might be.
 *
 * A client will pass in a dns_name_t, and the ADB will walk through
 * the rdataset looking up addresses associated with the name.  If it
 * is found on the internal lists, a structure is filled in with the
 * address information and stats for found addresses.
 *
 * If the name cannot be found on the internal lists, a new entry will
 * be created for a name if all the information needed can be found
 * in the zone table or cache.  This new address will then be returned.
 *
 * If a request must be made to remote servers to satisfy a name lookup,
 * this module will start fetches to try to complete these addresses.  When
 * at least one more completes, an event is sent to the caller.  If none of
 * them resolve before the fetch times out, an event indicating this is
 * sent instead.
 *
 * Records are stored internally until a timer expires. The timer is the
 * smaller of the TTL or signature validity period.
 *
 * Lameness is stored per <qname,qtype> tuple, and this data hangs off each
 * address field.  When an address is marked lame for a given tuple the address
 * will not be returned to a caller.
 *
 *
 * MP:
 *
 *\li	The ADB takes care of all necessary locking.
 *
 *\li	Only the task which initiated the name lookup can cancel the lookup.
 *
 *
 * Security:
 *
 *\li	None, since all data stored is required to be pre-filtered.
 *	(Cache needs to be sane, fetches return bounds-checked and sanity-
 *       checked data, caller passes a good dns_name_t for the zone, etc)
 */

/***
 *** Imports
 ***/

#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/sockaddr.h>

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

ISC_LANG_BEGINDECLS

/***
 *** Magic number checks
 ***/

#define DNS_ADBFIND_MAGIC	  ISC_MAGIC('a','d','b','H')
#define DNS_ADBFIND_VALID(x)	  ISC_MAGIC_VALID(x, DNS_ADBFIND_MAGIC)
#define DNS_ADBADDRINFO_MAGIC	  ISC_MAGIC('a','d','A','I')
#define DNS_ADBADDRINFO_VALID(x)  ISC_MAGIC_VALID(x, DNS_ADBADDRINFO_MAGIC)

/***
 *** TYPES
 ***/

typedef struct dns_adbname		dns_adbname_t;

/*!
 *\brief
 * Represents a lookup for a single name.
 *
 * On return, the client can safely use "list", and can reorder the list.
 * Items may not be _deleted_ from this list, however, or added to it
 * other than by using the dns_adb_*() API.
 */
struct dns_adbfind {
	/* Public */
	unsigned int			magic;		/*%< RO: magic */
	dns_adbaddrinfolist_t		list;		/*%< RO: list of addrs */
	unsigned int			query_pending;	/*%< RO: partial list */
	unsigned int			partial_result;	/*%< RO: addrs missing */
	unsigned int			options;	/*%< RO: options */
	isc_result_t			result_v4;	/*%< RO: v4 result */
	isc_result_t			result_v6;	/*%< RO: v6 result */
	ISC_LINK(dns_adbfind_t)		publink;	/*%< RW: client use */

/* Private */
	isc_mutex_t			lock;		/* locks all below */
	in_port_t			port;
	int				name_bucket;
	unsigned int			flags;
	dns_adbname_t		       *adbname;
	dns_adb_t		       *adb;
	isc_event_t			event;
	ISC_LINK(dns_adbfind_t)		plink;
};

/*
 * _INET:
 * _INET6:
 *	return addresses of that type.
 *
 * _EMPTYEVENT:
 *	Only schedule an event if no addresses are known.
 *	Must set _WANTEVENT for this to be meaningful.
 *
 * _WANTEVENT:
 *	An event is desired.  Check this bit in the returned find to see
 *	if one will actually be generated.
 *
 * _AVOIDFETCHES:
 *	If set, fetches will not be generated unless no addresses are
 *	available in any of the address families requested.
 *
 * _STARTATZONE:
 *	Fetches will start using the closest zone data or use the root servers.
 *	This is useful for reestablishing glue that has expired.
 *
 * _GLUEOK:
 * _HINTOK:
 *	Glue or hints are ok.  These are used when matching names already
 *	in the adb, and when dns databases are searched.
 *
 * _RETURNLAME:
 *	Return lame servers in a find, so that all addresses are returned.
 *
 * _LAMEPRUNED:
 *	At least one address was omitted from the list because it was lame.
 *	This bit will NEVER be set if _RETURNLAME is set in the createfind().
 */
/*% Return addresses of type INET. */
#define DNS_ADBFIND_INET		0x00000001
/*% Return addresses of type INET6. */
#define DNS_ADBFIND_INET6		0x00000002
#define DNS_ADBFIND_ADDRESSMASK		0x00000003
/*%
 *      Only schedule an event if no addresses are known.
 *      Must set _WANTEVENT for this to be meaningful.
 */
#define DNS_ADBFIND_EMPTYEVENT		0x00000004
/*%
 *	An event is desired.  Check this bit in the returned find to see
 *	if one will actually be generated.
 */
#define DNS_ADBFIND_WANTEVENT		0x00000008
/*%
 *	If set, fetches will not be generated unless no addresses are
 *	available in any of the address families requested.
 */
#define DNS_ADBFIND_AVOIDFETCHES	0x00000010
/*%
 *	Fetches will start using the closest zone data or use the root servers.
 *	This is useful for reestablishing glue that has expired.
 */
#define DNS_ADBFIND_STARTATZONE		0x00000020
/*%
 *	Glue or hints are ok.  These are used when matching names already
 *	in the adb, and when dns databases are searched.
 */
#define DNS_ADBFIND_GLUEOK		0x00000040
/*%
 *	Glue or hints are ok.  These are used when matching names already
 *	in the adb, and when dns databases are searched.
 */
#define DNS_ADBFIND_HINTOK		0x00000080
/*%
 *	Return lame servers in a find, so that all addresses are returned.
 */
#define DNS_ADBFIND_RETURNLAME		0x00000100
/*%
 *      Only schedule an event if no addresses are known.
 *      Must set _WANTEVENT for this to be meaningful.
 */
#define DNS_ADBFIND_LAMEPRUNED		0x00000200
/*%
 *	Don't perform a fetch even if there are no address records available.
 */
#define DNS_ADBFIND_NOFETCH		0x00000800

/*%
 * The answers to queries come back as a list of these.
 */
struct dns_adbaddrinfo {
	unsigned int			magic;		/*%< private */

isc_sockaddr_t			sockaddr;	/*%< [rw] */
	unsigned int			srtt;		/*%< [rw] microseconds */
	unsigned int			flags;		/*%< [rw] */
	dns_adbentry_t		       *entry;		/*%< private */
	ISC_LINK(dns_adbaddrinfo_t)	publink;
};

/*!<
 * The event sent to the caller task is just a plain old isc_event_t.  It
 * contains no data other than a simple status, passed in the "type" field
 * to indicate that another address resolved, or all partially resolved
 * addresses have failed to resolve.
 *
 * "sender" is the dns_adbfind_t used to issue this query.
 *
 * This is simply a standard event, with the "type" set to:
 *
 *\li	#DNS_EVENT_ADBMOREADDRESSES   -- another address resolved.
 *\li	#DNS_EVENT_ADBNOMOREADDRESSES -- all pending addresses failed,
 *					were canceled, or otherwise will
 *					not be usable.
 *\li	#DNS_EVENT_ADBCANCELED	     -- The request was canceled by a
 *					3rd party.
 *\li	#DNS_EVENT_ADBNAMEDELETED     -- The name was deleted, so this request
 *					was canceled.
 *
 * In each of these cases, the addresses returned by the initial call
 * to dns_adb_createfind() can still be used until they are no longer needed.
 */

/****
 **** FUNCTIONS
 ****/

isc_result_t
dns_adb_create(isc_mem_t *mem, dns_view_t *view, isc_timermgr_t *tmgr,
	       isc_taskmgr_t *taskmgr, dns_adb_t **newadb);
/*%<
 * Create a new ADB.
 *
 * Notes:
 *
 *\li	Generally, applications should not create an ADB directly, but
 *	should instead call dns_view_createresolver().
 *
 * Requires:
 *
 *\li	'mem' must be a valid memory context.
 *
 *\li	'view' be a pointer to a valid view.
 *
 *\li	'tmgr' be a pointer to a valid timer manager.
 *
 *\li	'taskmgr' be a pointer to a valid task manager.
 *
 *\li	'newadb' != NULL && '*newadb' == NULL.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS	after happiness.
 *\li	#ISC_R_NOMEMORY	after resource allocation failure.
 */

void
dns_adb_attach(dns_adb_t *adb, dns_adb_t **adbp);
/*%
 * Attach to an 'adb' to 'adbp'.
 *
 * Requires:
 *\li	'adb' to be a valid dns_adb_t, created via dns_adb_create().
 *\li	'adbp' to be a valid pointer to a *dns_adb_t which is initialized
 *	to NULL.
 */

void
dns_adb_detach(dns_adb_t **adb);
/*%
 * Delete the ADB. Sets *ADB to NULL. Cancels any outstanding requests.
 *
 * Requires:
 *
 *\li	'adb' be non-NULL and '*adb' be a valid dns_adb_t, created via
 *	dns_adb_create().
 */

void
dns_adb_whenshutdown(dns_adb_t *adb, isc_task_t *task, isc_event_t **eventp);
/*%
 * Send '*eventp' to 'task' when 'adb' has shutdown.
 *
 * Requires:
 *
 *\li	'*adb' is a valid dns_adb_t.
 *
 *\li	eventp != NULL && *eventp is a valid event.
 *
 * Ensures:
 *
 *\li	*eventp == NULL
 *
 *\li	The event's sender field is set to the value of adb when the event
 *	is sent.
 */

void
dns_adb_shutdown(dns_adb_t *adb);
/*%<
 * Shutdown 'adb'.
 *
 * Requires:
 *
 * \li	'*adb' is a valid dns_adb_t.
 */

isc_result_t
dns_adb_createfind(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
		   void *arg, dns_name_t *name, dns_name_t *qname,
		   dns_rdatatype_t qtype, unsigned int options,
		   isc_stdtime_t now, dns_name_t *target,
		   in_port_t port, dns_adbfind_t **find);
isc_result_t
dns_adb_createfind2(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
		    void *arg, dns_name_t *name, dns_name_t *qname,
		    dns_rdatatype_t qtype, unsigned int options,
		    isc_stdtime_t now, dns_name_t *target, in_port_t port,
		    unsigned int depth, isc_counter_t *qc,
		    dns_adbfind_t **find);
/*%<
 * Main interface for clients. The adb will look up the name given in
 * "name" and will build up a list of found addresses, and perhaps start
 * internal fetches to resolve names that are unknown currently.
 *
 * If other addresses resolve after this call completes, an event will
 * be sent to the <task, taskaction, arg> with the sender of that event
 * set to a pointer to the dns_adbfind_t returned by this function.
 *
 * If no events will be generated, the *find->result_v4 and/or result_v6
 * members may be examined for address lookup status.  The usual #ISC_R_SUCCESS,
 * #ISC_R_FAILURE, #DNS_R_NXDOMAIN, and #DNS_R_NXRRSET are returned, along with
 * #ISC_R_NOTFOUND meaning the ADB has not _yet_ found the values.  In this
 * latter case, retrying may produce more addresses.
 *
 * If events will be returned, the result_v[46] members are only valid
 * when that event is actually returned.
 *
 * The list of addresses returned is unordered.  The caller must impose
 * any ordering required.  The list will not contain "known bad" addresses,
 * however.  For instance, it will not return hosts that are known to be
 * lame for the zone in question.
 *
 * The caller cannot (directly) modify the contents of the address list's
 * fields other than the "link" field.  All values can be read at any
 * time, however.
 *
 * The "now" parameter is used only for determining which entries that
 * have a specific time to live or expire time should be removed from
 * the running database.  If specified as zero, the current time will
 * be retrieved and used.
 *
 * If 'target' is not NULL and 'name' is an alias (i.e. the name is
 * CNAME'd or DNAME'd to another name), then 'target' will be updated with
 * the domain name that 'name' is aliased to.
 *
 * All addresses returned will have the sockaddr's port set to 'port.'
 * The caller may change them directly in the dns_adbaddrinfo_t since
 * they are copies of the internal address only.
 *
 * XXXMLG  Document options, especially the flags which control how
 *         events are sent.
 *
 * Requires:
 *
 *\li	*adb be a valid isc_adb_t object.
 *
 *\li	If events are to be sent, *task be a valid task,
 *	and isc_taskaction_t != NULL.
 *
 *\li	*name is a valid dns_name_t.
 *
 *\li	qname != NULL and *qname be a valid dns_name_t.
 *
 *\li	target == NULL or target is a valid name with a buffer.
 *
 *\li	find != NULL && *find == NULL.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS	Addresses might have been returned, and events will be
 *			delivered for unresolved addresses.
 *\li	#ISC_R_NOMORE	Addresses might have been returned, but no events
 *			will ever be posted for this context.  This is only
 *			returned if task != NULL.
 *\li	#ISC_R_NOMEMORY	insufficient resources
 *\li	#DNS_R_ALIAS	'name' is an alias for another name.
 *
 * Calls, and returns error codes from:
 *
 *\li	isc_stdtime_get()
 *
 * Notes:
 *
 *\li	No internal reference to "name" exists after this function
 *	returns.
 */

void
dns_adb_cancelfind(dns_adbfind_t *find);
/*%<
 * Cancels the find, and sends the event off to the caller.
 *
 * It is an error to call dns_adb_cancelfind() on a find where
 * no event is wanted, or will ever be sent.
 *
 * Note:
 *
 *\li	It is possible that the real completion event was posted just
 *	before the dns_adb_cancelfind() call was made.  In this case,
 *	dns_adb_cancelfind() will do nothing.  The event callback needs
 *	to be prepared to find this situation (i.e. result is valid but
 *	the caller expects it to be canceled).
 *
 * Requires:
 *
 *\li	'find' be a valid dns_adbfind_t pointer.
 *
 *\li	events would have been posted to the task.  This can be checked
 *	with (find->options & DNS_ADBFIND_WANTEVENT).
 *
 * Ensures:
 *
 *\li	The event was posted to the task.
 */

void
dns_adb_destroyfind(dns_adbfind_t **find);
/*%<
 * Destroys the find reference.
 *
 * Note:
 *
 *\li	This can only be called after the event was delivered for a
 *	find.  Additionally, the event MUST have been freed via
 *	isc_event_free() BEFORE this function is called.
 *
 * Requires:
 *
 *\li	'find' != NULL and *find be valid dns_adbfind_t pointer.
 *
 * Ensures:
 *
 *\li	No "address found" events will be posted to the originating task
 *	after this function returns.
 */

void
dns_adb_dump(dns_adb_t *adb, FILE *f);
/*%<
 * This function is only used for debugging.  It will dump as much of the
 * state of the running system as possible.
 *
 * Requires:
 *
 *\li	adb be valid.
 *
 *\li	f != NULL, and is a file open for writing.
 */

void
dns_adb_dumpfind(dns_adbfind_t *find, FILE *f);
/*%<
 * This function is only used for debugging.  Dump the data associated
 * with a find.
 *
 * Requires:
 *
 *\li	find is valid.
 *
 * \li	f != NULL, and is a file open for writing.
 */

isc_result_t
dns_adb_marklame(dns_adb_t *adb, dns_adbaddrinfo_t *addr, dns_name_t *qname,
		 dns_rdatatype_t type, isc_stdtime_t expire_time);
/*%<
 * Mark the given address as lame for the <qname,qtype>.  expire_time should
 * be set to the time when the entry should expire.  That is, if it is to
 * expire 10 minutes in the future, it should set it to (now + 10 * 60).
 *
 * Requires:
 *
 *\li	adb be valid.
 *
 *\li	addr be valid.
 *
 *\li	qname be the qname used in the dns_adb_createfind() call.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS		-- all is well.
 *\li	#ISC_R_NOMEMORY		-- could not mark address as lame.
 */

/*
 * A reasonable default for RTT adjustments
 */
#define DNS_ADB_RTTADJDEFAULT		7	/*%< default scale */
#define DNS_ADB_RTTADJREPLACE		0	/*%< replace with our rtt */
#define DNS_ADB_RTTADJAGE		10	/*%< age this rtt */

void
dns_adb_adjustsrtt(dns_adb_t *adb, dns_adbaddrinfo_t *addr,
		   unsigned int rtt, unsigned int factor);
/*%<
 * Mix the round trip time into the existing smoothed rtt.

* The formula used
 * (where srtt is the existing rtt value, and rtt and factor are arguments to
 * this function):
 *
 *\code
 *	new_srtt = (old_srtt / 10 * factor) + (rtt / 10 * (10 - factor));
 *\endcode
 *
 * XXXRTH  Do we want to publish the formula?  What if we want to change how
 *         this works later on?  Recommend/require that the units are
 *	   microseconds?
 *
 * Requires:
 *
 *\li	adb be valid.
 *
 *\li	addr be valid.
 *
 *\li	0 <= factor <= 10
 *
 * Note:
 *
 *\li	The srtt in addr will be updated to reflect the new global
 *	srtt value.  This may include changes made by others.
 */

void
dns_adb_changeflags(dns_adb_t *adb, dns_adbaddrinfo_t *addr,
		    unsigned int bits, unsigned int mask);
/*%
 * Change Flags.
 *
 * Set the flags as given by:
 *
 *\li	newflags = (oldflags & ~mask) | (bits & mask);
 *
 * Requires:
 *
 *\li	adb be valid.
 *
 *\li	addr be valid.
 */

isc_result_t
dns_adb_findaddrinfo(dns_adb_t *adb, isc_sockaddr_t *sa,
		     dns_adbaddrinfo_t **addrp, isc_stdtime_t now);
/*%<
 * Return a dns_adbaddrinfo_t that is associated with address 'sa'.
 *
 * Requires:
 *
 *\li	adb is valid.
 *
 *\li	sa is valid.
 *
 *\li	addrp != NULL && *addrp == NULL
 *
 * Returns:
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOMEMORY
 *\li	#ISC_R_SHUTTINGDOWN
 */

void
dns_adb_freeaddrinfo(dns_adb_t *adb, dns_adbaddrinfo_t **addrp);
/*%<
 * Free a dns_adbaddrinfo_t allocated by dns_adb_findaddrinfo().
 *
 * Requires:
 *
 *\li	adb is valid.
 *
 *\li	*addrp is a valid dns_adbaddrinfo_t *.
 */

void
dns_adb_flush(dns_adb_t *adb);
/*%<
 * Flushes all cached data from the adb.
 *
 * Requires:
 *\li 	adb is valid.
 */

void
dns_adb_setadbsize(dns_adb_t *adb, isc_uint32_t size);
/*%<
 * Set a target memory size.  If memory usage exceeds the target
 * size entries will be removed before they would have expired on
 * a random basis.
 *
 * If 'size' is 0 then memory usage is unlimited.
 *
 * Requires:
 *\li	'adb' is valid.
 */

void
dns_adb_flushname(dns_adb_t *adb, dns_name_t *name);
/*%<
 * Flush 'name' from the adb cache.
 *
 * Requires:
 *\li	'adb' is valid.
 *\li	'name' is valid.
 */

ISC_LANG_ENDDECLS

#endif /* DNS_ADB_H */

cmd: