2 * Copyright (C) 2004-2012 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
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18 /* $Id: rdataset.h,v 1.72 2011/06/08 22:13:51 each Exp $ */
20 #ifndef DNS_RDATASET_H
21 #define DNS_RDATASET_H 1
27 /*! \file dns/rdataset.h
29 * A DNS rdataset is a handle that can be associated with a collection of
30 * rdata all having a common owner name, class, and type.
32 * The dns_rdataset_t type is like a "virtual class". To actually use
33 * rdatasets, an implementation of the method suite (e.g. "slabbed rdata") is
36 * XXX <more> XXX
39 *\li Clients of this module must impose any required synchronization.
42 *\li No anticipated impact.
48 *\li No anticipated impact.
55 #include <isc/magic.h>
56 #include <isc/stdtime.h>
58 #include <dns/types.h>
59 #include <dns/rdatastruct.h>
64 dns_rdatasetadditional_fromauth,
65 dns_rdatasetadditional_fromcache,
66 dns_rdatasetadditional_fromglue
67 } dns_rdatasetadditional_t;
69 typedef struct dns_rdatasetmethods {
70 void (*disassociate)(dns_rdataset_t *rdataset);
71 isc_result_t (*first)(dns_rdataset_t *rdataset);
72 isc_result_t (*next)(dns_rdataset_t *rdataset);
73 void (*current)(dns_rdataset_t *rdataset,
75 void (*clone)(dns_rdataset_t *source,
76 dns_rdataset_t *target);
77 unsigned int (*count)(dns_rdataset_t *rdataset);
78 isc_result_t (*addnoqname)(dns_rdataset_t *rdataset,
80 isc_result_t (*getnoqname)(dns_rdataset_t *rdataset,
83 dns_rdataset_t *negsig);
84 isc_result_t (*addclosest)(dns_rdataset_t *rdataset,
86 isc_result_t (*getclosest)(dns_rdataset_t *rdataset,
89 dns_rdataset_t *negsig);
90 isc_result_t (*getadditional)(dns_rdataset_t *rdataset,
91 dns_rdatasetadditional_t type,
92 dns_rdatatype_t qtype,
96 dns_dbversion_t **versionp,
101 isc_result_t (*setadditional)(dns_rdataset_t *rdataset,
102 dns_rdatasetadditional_t type,
103 dns_rdatatype_t qtype,
104 dns_acache_t *acache,
107 dns_dbversion_t *version,
110 isc_result_t (*putadditional)(dns_acache_t *acache,
111 dns_rdataset_t *rdataset,
112 dns_rdatasetadditional_t type,
113 dns_rdatatype_t qtype);
114 void (*settrust)(dns_rdataset_t *rdataset,
116 void (*expire)(dns_rdataset_t *rdataset);
117 } dns_rdatasetmethods_t;
119 #define DNS_RDATASET_MAGIC ISC_MAGIC('D','N','S','R')
120 #define DNS_RDATASET_VALID(set) ISC_MAGIC_VALID(set, DNS_RDATASET_MAGIC)
123 * Direct use of this structure by clients is strongly discouraged, except
124 * for the 'link' field which may be used however the client wishes. The
125 * 'private', 'current', and 'index' fields MUST NOT be changed by clients.
126 * rdataset implementations may change any of the fields.
128 struct dns_rdataset {
129 unsigned int magic; /* XXX ? */
130 dns_rdatasetmethods_t * methods;
131 ISC_LINK(dns_rdataset_t) link;
133 * XXX do we need these, or should they be retrieved by methods?
134 * Leaning towards the latter, since they are not frequently required
135 * once you have the rdataset.
137 dns_rdataclass_t rdclass;
138 dns_rdatatype_t type;
141 dns_rdatatype_t covers;
145 unsigned int attributes;
147 * the counter provides the starting point in the "cyclic" order.
148 * The value ISC_UINT32_MAX has a special meaning of "picking up a
149 * random value." in order to take care of databases that do not
150 * increment the counter.
154 * This RRSIG RRset should be re-generated around this time.
155 * Only valid if DNS_RDATASETATTR_RESIGN is set in attributes.
157 isc_stdtime_t resign;
160 * These are for use by the rdataset implementation, and MUST NOT
161 * be changed by clients.
166 unsigned int privateuint4;
175 * \def DNS_RDATASETATTR_RENDERED
176 * Used by message.c to indicate that the rdataset was rendered.
178 * \def DNS_RDATASETATTR_TTLADJUSTED
179 * Used by message.c to indicate that the rdataset's rdata had differing
180 * TTL values, and the rdataset->ttl holds the smallest.
182 * \def DNS_RDATASETATTR_LOADORDER
183 * Output the RRset in load order.
186 #define DNS_RDATASETATTR_QUESTION 0x00000001
187 #define DNS_RDATASETATTR_RENDERED 0x00000002 /*%< Used by message.c */
188 #define DNS_RDATASETATTR_ANSWERED 0x00000004 /*%< Used by server. */
189 #define DNS_RDATASETATTR_CACHE 0x00000008 /*%< Used by resolver. */
190 #define DNS_RDATASETATTR_ANSWER 0x00000010 /*%< Used by resolver. */
191 #define DNS_RDATASETATTR_ANSWERSIG 0x00000020 /*%< Used by resolver. */
192 #define DNS_RDATASETATTR_EXTERNAL 0x00000040 /*%< Used by resolver. */
193 #define DNS_RDATASETATTR_NCACHE 0x00000080 /*%< Used by resolver. */
194 #define DNS_RDATASETATTR_CHAINING 0x00000100 /*%< Used by resolver. */
195 #define DNS_RDATASETATTR_TTLADJUSTED 0x00000200 /*%< Used by message.c */
196 #define DNS_RDATASETATTR_FIXEDORDER 0x00000400
197 #define DNS_RDATASETATTR_RANDOMIZE 0x00000800
198 #define DNS_RDATASETATTR_CHASE 0x00001000 /*%< Used by resolver. */
199 #define DNS_RDATASETATTR_NXDOMAIN 0x00002000
200 #define DNS_RDATASETATTR_NOQNAME 0x00004000
201 #define DNS_RDATASETATTR_CHECKNAMES 0x00008000 /*%< Used by resolver. */
202 #define DNS_RDATASETATTR_REQUIREDGLUE 0x00010000
203 #define DNS_RDATASETATTR_LOADORDER 0x00020000
204 #define DNS_RDATASETATTR_RESIGN 0x00040000
205 #define DNS_RDATASETATTR_CLOSEST 0x00080000
206 #define DNS_RDATASETATTR_OPTOUT 0x00100000 /*%< OPTOUT proof */
207 #define DNS_RDATASETATTR_NEGATIVE 0x00200000
211 * Omit DNSSEC records when rendering ncache records.
213 #define DNS_RDATASETTOWIRE_OMITDNSSEC 0x0001
216 dns_rdataset_init(dns_rdataset_t *rdataset);
218 * Make 'rdataset' a valid, disassociated rdataset.
221 *\li 'rdataset' is not NULL.
224 *\li 'rdataset' is a valid, disassociated rdataset.
228 dns_rdataset_invalidate(dns_rdataset_t *rdataset);
230 * Invalidate 'rdataset'.
233 *\li 'rdataset' is a valid, disassociated rdataset.
236 *\li If assertion checking is enabled, future attempts to use 'rdataset'
237 * without initializing it will cause an assertion failure.
241 dns_rdataset_disassociate(dns_rdataset_t *rdataset);
243 * Disassociate 'rdataset' from its rdata, allowing it to be reused.
246 *\li The client must ensure it has no references to rdata in the rdataset
247 * before disassociating.
250 *\li 'rdataset' is a valid, associated rdataset.
253 *\li 'rdataset' is a valid, disassociated rdataset.
257 dns_rdataset_isassociated(dns_rdataset_t *rdataset);
259 * Is 'rdataset' associated?
262 *\li 'rdataset' is a valid rdataset.
265 *\li #ISC_TRUE 'rdataset' is associated.
266 *\li #ISC_FALSE 'rdataset' is not associated.
270 dns_rdataset_makequestion(dns_rdataset_t *rdataset, dns_rdataclass_t rdclass,
271 dns_rdatatype_t type);
273 * Make 'rdataset' a valid, associated, question rdataset, with a
274 * question class of 'rdclass' and type 'type'.
277 *\li Question rdatasets have a class and type, but no rdata.
280 *\li 'rdataset' is a valid, disassociated rdataset.
283 *\li 'rdataset' is a valid, associated, question rdataset.
287 dns_rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target);
289 * Make 'target' refer to the same rdataset as 'source'.
292 *\li 'source' is a valid, associated rdataset.
294 *\li 'target' is a valid, dissociated rdataset.
297 *\li 'target' references the same rdataset as 'source'.
301 dns_rdataset_count(dns_rdataset_t *rdataset);
303 * Return the number of records in 'rdataset'.
306 *\li 'rdataset' is a valid, associated rdataset.
309 *\li The number of records in 'rdataset'.
313 dns_rdataset_first(dns_rdataset_t *rdataset);
315 * Move the rdata cursor to the first rdata in the rdataset (if any).
318 *\li 'rdataset' is a valid, associated rdataset.
322 *\li #ISC_R_NOMORE There are no rdata in the set.
326 dns_rdataset_next(dns_rdataset_t *rdataset);
328 * Move the rdata cursor to the next rdata in the rdataset (if any).
331 *\li 'rdataset' is a valid, associated rdataset.
335 *\li #ISC_R_NOMORE There are no more rdata in the set.
339 dns_rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata);
341 * Make 'rdata' refer to the current rdata.
345 *\li The data returned in 'rdata' is valid for the life of the
346 * rdataset; in particular, subsequent changes in the cursor position
347 * do not invalidate 'rdata'.
350 *\li 'rdataset' is a valid, associated rdataset.
352 *\li The rdata cursor of 'rdataset' is at a valid location (i.e. the
353 * result of last call to a cursor movement command was ISC_R_SUCCESS).
356 *\li 'rdata' refers to the rdata at the rdata cursor location of
361 dns_rdataset_totext(dns_rdataset_t *rdataset,
362 dns_name_t *owner_name,
363 isc_boolean_t omit_final_dot,
364 isc_boolean_t question,
365 isc_buffer_t *target);
367 * Convert 'rdataset' to text format, storing the result in 'target'.
370 *\li The rdata cursor position will be changed.
372 *\li The 'question' flag should normally be #ISC_FALSE. If it is
373 * #ISC_TRUE, the TTL and rdata fields are not printed. This is
374 * for use when printing an rdata representing a question section.
376 *\li This interface is deprecated; use dns_master_rdatasettottext()
377 * and/or dns_master_questiontotext() instead.
380 *\li 'rdataset' is a valid rdataset.
382 *\li 'rdataset' is not empty.
386 dns_rdataset_towire(dns_rdataset_t *rdataset,
387 dns_name_t *owner_name,
388 dns_compress_t *cctx,
389 isc_buffer_t *target,
390 unsigned int options,
391 unsigned int *countp);
393 * Convert 'rdataset' to wire format, compressing names as specified
394 * in 'cctx', and storing the result in 'target'.
397 *\li The rdata cursor position will be changed.
399 *\li The number of RRs added to target will be added to *countp.
402 *\li 'rdataset' is a valid rdataset.
404 *\li 'rdataset' is not empty.
406 *\li 'countp' is a valid pointer.
409 *\li On a return of ISC_R_SUCCESS, 'target' contains a wire format
410 * for the data contained in 'rdataset'. Any error return leaves
411 * the buffer unchanged.
413 *\li *countp has been incremented by the number of RRs added to
417 *\li #ISC_R_SUCCESS - all ok
418 *\li #ISC_R_NOSPACE - 'target' doesn't have enough room
420 *\li Any error returned by dns_rdata_towire(), dns_rdataset_next(),
425 dns_rdataset_towiresorted(dns_rdataset_t *rdataset,
426 const dns_name_t *owner_name,
427 dns_compress_t *cctx,
428 isc_buffer_t *target,
429 dns_rdatasetorderfunc_t order,
430 const void *order_arg,
431 unsigned int options,
432 unsigned int *countp);
434 * Like dns_rdataset_towire(), but sorting the rdatasets according to
435 * the integer value returned by 'order' when called with the rdataset
436 * and 'order_arg' as arguments.
439 *\li All the requirements of dns_rdataset_towire(), and
440 * that order_arg is NULL if and only if order is NULL.
444 dns_rdataset_towirepartial(dns_rdataset_t *rdataset,
445 const dns_name_t *owner_name,
446 dns_compress_t *cctx,
447 isc_buffer_t *target,
448 dns_rdatasetorderfunc_t order,
449 const void *order_arg,
450 unsigned int options,
451 unsigned int *countp,
454 * Like dns_rdataset_towiresorted() except that a partial rdataset
458 *\li All the requirements of dns_rdataset_towiresorted().
459 * If 'state' is non NULL then the current position in the
460 * rdataset will be remembered if the rdataset in not
461 * completely written and should be passed on on subsequent
462 * calls (NOT CURRENTLY IMPLEMENTED).
465 *\li #ISC_R_SUCCESS if all of the records were written.
466 *\li #ISC_R_NOSPACE if unable to fit in all of the records. *countp
467 * will be updated to reflect the number of records
472 dns_rdataset_additionaldata(dns_rdataset_t *rdataset,
473 dns_additionaldatafunc_t add, void *arg);
475 * For each rdata in rdataset, call 'add' for each name and type in the
476 * rdata which is subject to additional section processing.
480 *\li 'rdataset' is a valid, non-question rdataset.
482 *\li 'add' is a valid dns_additionaldatafunc_t
486 *\li If successful, dns_rdata_additionaldata() will have been called for
487 * each rdata in 'rdataset'.
489 *\li If a call to dns_rdata_additionaldata() is not successful, the
490 * result returned will be the result of dns_rdataset_additionaldata().
496 *\li Any error that dns_rdata_additionaldata() can return.
500 dns_rdataset_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
501 dns_rdataset_t *neg, dns_rdataset_t *negsig);
503 * Return the noqname proof for this record.
506 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_NOQNAME to be set.
507 *\li 'name' to be valid.
508 *\li 'neg' and 'negsig' to be valid and not associated.
512 dns_rdataset_addnoqname(dns_rdataset_t *rdataset, dns_name_t *name);
514 * Associate a noqname proof with this record.
515 * Sets #DNS_RDATASETATTR_NOQNAME if successful.
516 * Adjusts the 'rdataset->ttl' to minimum of the 'rdataset->ttl' and
517 * the 'nsec'/'nsec3' and 'rrsig(nsec)'/'rrsig(nsec3)' ttl.
520 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_NOQNAME to be set.
521 *\li 'name' to be valid and have NSEC or NSEC3 and associated RRSIG
526 dns_rdataset_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
527 dns_rdataset_t *nsec, dns_rdataset_t *nsecsig);
529 * Return the closest encloser for this record.
532 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_CLOSEST to be set.
533 *\li 'name' to be valid.
534 *\li 'nsec' and 'nsecsig' to be valid and not associated.
538 dns_rdataset_addclosest(dns_rdataset_t *rdataset, dns_name_t *name);
540 * Associate a closest encloset proof with this record.
541 * Sets #DNS_RDATASETATTR_CLOSEST if successful.
542 * Adjusts the 'rdataset->ttl' to minimum of the 'rdataset->ttl' and
543 * the 'nsec' and 'rrsig(nsec)' ttl.
546 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_CLOSEST to be set.
547 *\li 'name' to be valid and have NSEC3 and RRSIG(NSEC3) rdatasets.
551 dns_rdataset_getadditional(dns_rdataset_t *rdataset,
552 dns_rdatasetadditional_t type,
553 dns_rdatatype_t qtype,
554 dns_acache_t *acache,
557 dns_dbversion_t **versionp,
558 dns_dbnode_t **nodep,
563 * Get cached additional information from the DB node for a particular
564 * 'rdataset.' 'type' is one of dns_rdatasetadditional_fromauth,
565 * dns_rdatasetadditional_fromcache, and dns_rdatasetadditional_fromglue,
566 * which specifies the origin of the information. 'qtype' is intended to
567 * be used for specifying a particular rdata type in the cached information.
570 * \li 'rdataset' is a valid rdataset.
571 * \li 'acache' can be NULL, in which case this function will simply return
573 * \li For the other pointers, see dns_acache_getentry().
576 * \li See dns_acache_getentry().
580 * \li #ISC_R_FAILURE - additional information caching is not supported.
581 * \li #ISC_R_NOTFOUND - the corresponding DB node has not cached additional
582 * information for 'rdataset.'
583 * \li Any error that dns_acache_getentry() can return.
587 dns_rdataset_setadditional(dns_rdataset_t *rdataset,
588 dns_rdatasetadditional_t type,
589 dns_rdatatype_t qtype,
590 dns_acache_t *acache,
593 dns_dbversion_t *version,
597 * Set cached additional information to the DB node for a particular
598 * 'rdataset.' See dns_rdataset_getadditional for the semantics of 'type'
602 * \li 'rdataset' is a valid rdataset.
603 * \li 'acache' can be NULL, in which case this function will simply return
605 * \li For the other pointers, see dns_acache_setentry().
608 * \li See dns_acache_setentry().
612 * \li #ISC_R_FAILURE - additional information caching is not supported.
613 * \li #ISC_R_NOMEMORY
614 * \li Any error that dns_acache_setentry() can return.
618 dns_rdataset_putadditional(dns_acache_t *acache,
619 dns_rdataset_t *rdataset,
620 dns_rdatasetadditional_t type,
621 dns_rdatatype_t qtype);
623 * Discard cached additional information stored in the DB node for a particular
624 * 'rdataset.' See dns_rdataset_getadditional for the semantics of 'type'
628 * \li 'rdataset' is a valid rdataset.
629 * \li 'acache' can be NULL, in which case this function will simply return
633 * \li See dns_acache_cancelentry().
637 * \li #ISC_R_FAILURE - additional information caching is not supported.
638 * \li #ISC_R_NOTFOUND - the corresponding DB node has not cached additional
639 * information for 'rdataset.'
643 dns_rdataset_settrust(dns_rdataset_t *rdataset, dns_trust_t trust);
645 * Set the trust of the 'rdataset' to trust in any in the backing database.
646 * The local trust level of 'rdataset' is also set.
650 dns_rdataset_expire(dns_rdataset_t *rdataset);
652 * Mark the rdataset to be expired in the backing database.
656 dns_rdataset_trimttl(dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
657 dns_rdata_rrsig_t *rrsig, isc_stdtime_t now,
658 isc_boolean_t acceptexpired);
660 * Trim the ttl of 'rdataset' and 'sigrdataset' so that they will expire
661 * at or before 'rrsig->expiretime'. If 'acceptexpired' is true and the
662 * signature has expired or will expire in the next 120 seconds, limit
663 * the ttl to be no more than 120 seconds.
665 * The ttl is further limited by the original ttl as stored in 'rrsig'
666 * and the original ttl values of 'rdataset' and 'sigrdataset'.
669 * \li 'rdataset' is a valid rdataset.
670 * \li 'sigrdataset' is a valid rdataset.
671 * \li 'rrsig' is non NULL.
675 dns_trust_totext(dns_trust_t trust);
677 * Display trust in textual form.
682 #endif /* DNS_RDATASET_H */