2 * Copyright (C) 2004-2012, 2014 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
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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_REQUIRED 0x00010000
203 #define DNS_RDATASETATTR_REQUIREDGLUE DNS_RDATASETATTR_REQUIRED
204 #define DNS_RDATASETATTR_LOADORDER 0x00020000
205 #define DNS_RDATASETATTR_RESIGN 0x00040000
206 #define DNS_RDATASETATTR_CLOSEST 0x00080000
207 #define DNS_RDATASETATTR_OPTOUT 0x00100000 /*%< OPTOUT proof */
208 #define DNS_RDATASETATTR_NEGATIVE 0x00200000
212 * Omit DNSSEC records when rendering ncache records.
214 #define DNS_RDATASETTOWIRE_OMITDNSSEC 0x0001
217 dns_rdataset_init(dns_rdataset_t *rdataset);
219 * Make 'rdataset' a valid, disassociated rdataset.
222 *\li 'rdataset' is not NULL.
225 *\li 'rdataset' is a valid, disassociated rdataset.
229 dns_rdataset_invalidate(dns_rdataset_t *rdataset);
231 * Invalidate 'rdataset'.
234 *\li 'rdataset' is a valid, disassociated rdataset.
237 *\li If assertion checking is enabled, future attempts to use 'rdataset'
238 * without initializing it will cause an assertion failure.
242 dns_rdataset_disassociate(dns_rdataset_t *rdataset);
244 * Disassociate 'rdataset' from its rdata, allowing it to be reused.
247 *\li The client must ensure it has no references to rdata in the rdataset
248 * before disassociating.
251 *\li 'rdataset' is a valid, associated rdataset.
254 *\li 'rdataset' is a valid, disassociated rdataset.
258 dns_rdataset_isassociated(dns_rdataset_t *rdataset);
260 * Is 'rdataset' associated?
263 *\li 'rdataset' is a valid rdataset.
266 *\li #ISC_TRUE 'rdataset' is associated.
267 *\li #ISC_FALSE 'rdataset' is not associated.
271 dns_rdataset_makequestion(dns_rdataset_t *rdataset, dns_rdataclass_t rdclass,
272 dns_rdatatype_t type);
274 * Make 'rdataset' a valid, associated, question rdataset, with a
275 * question class of 'rdclass' and type 'type'.
278 *\li Question rdatasets have a class and type, but no rdata.
281 *\li 'rdataset' is a valid, disassociated rdataset.
284 *\li 'rdataset' is a valid, associated, question rdataset.
288 dns_rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target);
290 * Make 'target' refer to the same rdataset as 'source'.
293 *\li 'source' is a valid, associated rdataset.
295 *\li 'target' is a valid, dissociated rdataset.
298 *\li 'target' references the same rdataset as 'source'.
302 dns_rdataset_count(dns_rdataset_t *rdataset);
304 * Return the number of records in 'rdataset'.
307 *\li 'rdataset' is a valid, associated rdataset.
310 *\li The number of records in 'rdataset'.
314 dns_rdataset_first(dns_rdataset_t *rdataset);
316 * Move the rdata cursor to the first rdata in the rdataset (if any).
319 *\li 'rdataset' is a valid, associated rdataset.
323 *\li #ISC_R_NOMORE There are no rdata in the set.
327 dns_rdataset_next(dns_rdataset_t *rdataset);
329 * Move the rdata cursor to the next rdata in the rdataset (if any).
332 *\li 'rdataset' is a valid, associated rdataset.
336 *\li #ISC_R_NOMORE There are no more rdata in the set.
340 dns_rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata);
342 * Make 'rdata' refer to the current rdata.
346 *\li The data returned in 'rdata' is valid for the life of the
347 * rdataset; in particular, subsequent changes in the cursor position
348 * do not invalidate 'rdata'.
351 *\li 'rdataset' is a valid, associated rdataset.
353 *\li The rdata cursor of 'rdataset' is at a valid location (i.e. the
354 * result of last call to a cursor movement command was ISC_R_SUCCESS).
357 *\li 'rdata' refers to the rdata at the rdata cursor location of
362 dns_rdataset_totext(dns_rdataset_t *rdataset,
363 dns_name_t *owner_name,
364 isc_boolean_t omit_final_dot,
365 isc_boolean_t question,
366 isc_buffer_t *target);
368 * Convert 'rdataset' to text format, storing the result in 'target'.
371 *\li The rdata cursor position will be changed.
373 *\li The 'question' flag should normally be #ISC_FALSE. If it is
374 * #ISC_TRUE, the TTL and rdata fields are not printed. This is
375 * for use when printing an rdata representing a question section.
377 *\li This interface is deprecated; use dns_master_rdatasettottext()
378 * and/or dns_master_questiontotext() instead.
381 *\li 'rdataset' is a valid rdataset.
383 *\li 'rdataset' is not empty.
387 dns_rdataset_towire(dns_rdataset_t *rdataset,
388 dns_name_t *owner_name,
389 dns_compress_t *cctx,
390 isc_buffer_t *target,
391 unsigned int options,
392 unsigned int *countp);
394 * Convert 'rdataset' to wire format, compressing names as specified
395 * in 'cctx', and storing the result in 'target'.
398 *\li The rdata cursor position will be changed.
400 *\li The number of RRs added to target will be added to *countp.
403 *\li 'rdataset' is a valid rdataset.
405 *\li 'rdataset' is not empty.
407 *\li 'countp' is a valid pointer.
410 *\li On a return of ISC_R_SUCCESS, 'target' contains a wire format
411 * for the data contained in 'rdataset'. Any error return leaves
412 * the buffer unchanged.
414 *\li *countp has been incremented by the number of RRs added to
418 *\li #ISC_R_SUCCESS - all ok
419 *\li #ISC_R_NOSPACE - 'target' doesn't have enough room
421 *\li Any error returned by dns_rdata_towire(), dns_rdataset_next(),
426 dns_rdataset_towiresorted(dns_rdataset_t *rdataset,
427 const dns_name_t *owner_name,
428 dns_compress_t *cctx,
429 isc_buffer_t *target,
430 dns_rdatasetorderfunc_t order,
431 const void *order_arg,
432 unsigned int options,
433 unsigned int *countp);
435 * Like dns_rdataset_towire(), but sorting the rdatasets according to
436 * the integer value returned by 'order' when called with the rdataset
437 * and 'order_arg' as arguments.
440 *\li All the requirements of dns_rdataset_towire(), and
441 * that order_arg is NULL if and only if order is NULL.
445 dns_rdataset_towirepartial(dns_rdataset_t *rdataset,
446 const dns_name_t *owner_name,
447 dns_compress_t *cctx,
448 isc_buffer_t *target,
449 dns_rdatasetorderfunc_t order,
450 const void *order_arg,
451 unsigned int options,
452 unsigned int *countp,
455 * Like dns_rdataset_towiresorted() except that a partial rdataset
459 *\li All the requirements of dns_rdataset_towiresorted().
460 * If 'state' is non NULL then the current position in the
461 * rdataset will be remembered if the rdataset in not
462 * completely written and should be passed on on subsequent
463 * calls (NOT CURRENTLY IMPLEMENTED).
466 *\li #ISC_R_SUCCESS if all of the records were written.
467 *\li #ISC_R_NOSPACE if unable to fit in all of the records. *countp
468 * will be updated to reflect the number of records
473 dns_rdataset_additionaldata(dns_rdataset_t *rdataset,
474 dns_additionaldatafunc_t add, void *arg);
476 * For each rdata in rdataset, call 'add' for each name and type in the
477 * rdata which is subject to additional section processing.
481 *\li 'rdataset' is a valid, non-question rdataset.
483 *\li 'add' is a valid dns_additionaldatafunc_t
487 *\li If successful, dns_rdata_additionaldata() will have been called for
488 * each rdata in 'rdataset'.
490 *\li If a call to dns_rdata_additionaldata() is not successful, the
491 * result returned will be the result of dns_rdataset_additionaldata().
497 *\li Any error that dns_rdata_additionaldata() can return.
501 dns_rdataset_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
502 dns_rdataset_t *neg, dns_rdataset_t *negsig);
504 * Return the noqname proof for this record.
507 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_NOQNAME to be set.
508 *\li 'name' to be valid.
509 *\li 'neg' and 'negsig' to be valid and not associated.
513 dns_rdataset_addnoqname(dns_rdataset_t *rdataset, dns_name_t *name);
515 * Associate a noqname proof with this record.
516 * Sets #DNS_RDATASETATTR_NOQNAME if successful.
517 * Adjusts the 'rdataset->ttl' to minimum of the 'rdataset->ttl' and
518 * the 'nsec'/'nsec3' and 'rrsig(nsec)'/'rrsig(nsec3)' ttl.
521 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_NOQNAME to be set.
522 *\li 'name' to be valid and have NSEC or NSEC3 and associated RRSIG
527 dns_rdataset_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
528 dns_rdataset_t *nsec, dns_rdataset_t *nsecsig);
530 * Return the closest encloser for this record.
533 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_CLOSEST to be set.
534 *\li 'name' to be valid.
535 *\li 'nsec' and 'nsecsig' to be valid and not associated.
539 dns_rdataset_addclosest(dns_rdataset_t *rdataset, dns_name_t *name);
541 * Associate a closest encloset proof with this record.
542 * Sets #DNS_RDATASETATTR_CLOSEST if successful.
543 * Adjusts the 'rdataset->ttl' to minimum of the 'rdataset->ttl' and
544 * the 'nsec' and 'rrsig(nsec)' ttl.
547 *\li 'rdataset' to be valid and #DNS_RDATASETATTR_CLOSEST to be set.
548 *\li 'name' to be valid and have NSEC3 and RRSIG(NSEC3) rdatasets.
552 dns_rdataset_getadditional(dns_rdataset_t *rdataset,
553 dns_rdatasetadditional_t type,
554 dns_rdatatype_t qtype,
555 dns_acache_t *acache,
558 dns_dbversion_t **versionp,
559 dns_dbnode_t **nodep,
564 * Get cached additional information from the DB node for a particular
565 * 'rdataset.' 'type' is one of dns_rdatasetadditional_fromauth,
566 * dns_rdatasetadditional_fromcache, and dns_rdatasetadditional_fromglue,
567 * which specifies the origin of the information. 'qtype' is intended to
568 * be used for specifying a particular rdata type in the cached information.
571 * \li 'rdataset' is a valid rdataset.
572 * \li 'acache' can be NULL, in which case this function will simply return
574 * \li For the other pointers, see dns_acache_getentry().
577 * \li See dns_acache_getentry().
581 * \li #ISC_R_FAILURE - additional information caching is not supported.
582 * \li #ISC_R_NOTFOUND - the corresponding DB node has not cached additional
583 * information for 'rdataset.'
584 * \li Any error that dns_acache_getentry() can return.
588 dns_rdataset_setadditional(dns_rdataset_t *rdataset,
589 dns_rdatasetadditional_t type,
590 dns_rdatatype_t qtype,
591 dns_acache_t *acache,
594 dns_dbversion_t *version,
598 * Set cached additional information to the DB node for a particular
599 * 'rdataset.' See dns_rdataset_getadditional for the semantics of 'type'
603 * \li 'rdataset' is a valid rdataset.
604 * \li 'acache' can be NULL, in which case this function will simply return
606 * \li For the other pointers, see dns_acache_setentry().
609 * \li See dns_acache_setentry().
613 * \li #ISC_R_FAILURE - additional information caching is not supported.
614 * \li #ISC_R_NOMEMORY
615 * \li Any error that dns_acache_setentry() can return.
619 dns_rdataset_putadditional(dns_acache_t *acache,
620 dns_rdataset_t *rdataset,
621 dns_rdatasetadditional_t type,
622 dns_rdatatype_t qtype);
624 * Discard cached additional information stored in the DB node for a particular
625 * 'rdataset.' See dns_rdataset_getadditional for the semantics of 'type'
629 * \li 'rdataset' is a valid rdataset.
630 * \li 'acache' can be NULL, in which case this function will simply return
634 * \li See dns_acache_cancelentry().
638 * \li #ISC_R_FAILURE - additional information caching is not supported.
639 * \li #ISC_R_NOTFOUND - the corresponding DB node has not cached additional
640 * information for 'rdataset.'
644 dns_rdataset_settrust(dns_rdataset_t *rdataset, dns_trust_t trust);
646 * Set the trust of the 'rdataset' to trust in any in the backing database.
647 * The local trust level of 'rdataset' is also set.
651 dns_rdataset_expire(dns_rdataset_t *rdataset);
653 * Mark the rdataset to be expired in the backing database.
657 dns_rdataset_trimttl(dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
658 dns_rdata_rrsig_t *rrsig, isc_stdtime_t now,
659 isc_boolean_t acceptexpired);
661 * Trim the ttl of 'rdataset' and 'sigrdataset' so that they will expire
662 * at or before 'rrsig->expiretime'. If 'acceptexpired' is true and the
663 * signature has expired or will expire in the next 120 seconds, limit
664 * the ttl to be no more than 120 seconds.
666 * The ttl is further limited by the original ttl as stored in 'rrsig'
667 * and the original ttl values of 'rdataset' and 'sigrdataset'.
670 * \li 'rdataset' is a valid rdataset.
671 * \li 'sigrdataset' is a valid rdataset.
672 * \li 'rrsig' is non NULL.
676 dns_trust_totext(dns_trust_t trust);
678 * Display trust in textual form.
683 #endif /* DNS_RDATASET_H */