2 * util/data/packed_rrset.h - data storage for a set of resource records.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
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39 * This file contains the data storage for RRsets.
42 #ifndef UTIL_DATA_PACKED_RRSET_H
43 #define UTIL_DATA_PACKED_RRSET_H
44 #include "util/storage/lruhash.h"
48 /** type used to uniquely identify rrsets. Cannot be reused without
49 * clearing the cache. */
50 typedef uint64_t rrset_id_t;
52 /** this rrset is NSEC and is at zone apex (at child side of zonecut) */
53 #define PACKED_RRSET_NSEC_AT_APEX 0x1
54 /** this rrset is A/AAAA and is in-zone-glue (from parent side of zonecut) */
55 #define PACKED_RRSET_PARENT_SIDE 0x2
56 /** this rrset is SOA and has the negative ttl (from nxdomain or nodata),
57 * this is set on SOA rrsets in the authority section, to keep its TTL separate
58 * from the SOA in the answer section from a direct SOA query or ANY query. */
59 #define PACKED_RRSET_SOA_NEG 0x4
62 * The identifying information for an RRset.
64 struct packed_rrset_key {
66 * The domain name. If not null (for id=0) it is allocated, and
67 * contains the wireformat domain name.
68 * This dname is not canonicalized.
72 * Length of the domain name, including last 0 root octet.
76 * Flags. 32bit to be easy for hashing:
77 * o PACKED_RRSET_NSEC_AT_APEX
78 * o PACKED_RRSET_PARENT_SIDE
79 * o PACKED_RRSET_SOA_NEG
82 /** the rrset type in network format */
84 /** the rrset class in network format */
89 * This structure contains an RRset. A set of resource records that
90 * share the same domain name, type and class.
92 * Due to memory management and threading, the key structure cannot be
93 * deleted, although the data can be. The id can be set to 0 to store and the
94 * structure can be recycled with a new id.
96 struct ub_packed_rrset_key {
98 * entry into hashtable. Note the lock is never destroyed,
99 * even when this key is retired to the cache.
100 * the data pointer (if not null) points to a struct packed_rrset.
102 struct lruhash_entry entry;
104 * the ID of this rrset. unique, based on threadid + sequenceno.
105 * ids are not reused, except after flushing the cache.
106 * zero is an unused entry, and never a valid id.
107 * Check this value after getting entry.lock.
108 * The other values in this struct may only be altered after changing
109 * the id (which needs a writelock on entry.lock).
112 /** key data: dname, type and class */
113 struct packed_rrset_key rk;
117 * RRset trustworthiness. Bigger value is more trust. RFC 2181.
118 * The rrset_trust_add_noAA, rrset_trust_auth_noAA, rrset_trust_add_AA,
119 * are mentioned as the same trustworthiness in 2181, but split up here
120 * for ease of processing.
122 * rrset_trust_nonauth_ans_AA, rrset_trust_ans_noAA
123 * are also mentioned as the same trustworthiness in 2181, but split up here
124 * for ease of processing.
126 * Added trust_none for a sane initial value, smaller than anything else.
127 * Added validated and ultimate trust for keys and rrsig validated content.
130 /** initial value for trust */
131 rrset_trust_none = 0,
132 /** Additional information from non-authoritative answers */
133 rrset_trust_add_noAA,
134 /** Data from the authority section of a non-authoritative answer */
135 rrset_trust_auth_noAA,
136 /** Additional information from an authoritative answer */
138 /** non-authoritative data from the answer section of authoritative
140 rrset_trust_nonauth_ans_AA,
141 /** Data from the answer section of a non-authoritative answer */
142 rrset_trust_ans_noAA,
143 /** Glue from a primary zone, or glue from a zone transfer */
145 /** Data from the authority section of an authoritative answer */
147 /** The authoritative data included in the answer section of an
148 * authoritative reply */
150 /** Data from a zone transfer, other than glue */
151 rrset_trust_sec_noglue,
152 /** Data from a primary zone file, other than glue data */
153 rrset_trust_prim_noglue,
154 /** DNSSEC(rfc4034) validated with trusted keys */
155 rrset_trust_validated,
156 /** ultimately trusted, no more trust is possible;
157 * trusted keys from the unbound configuration setup. */
162 * Security status from validation for data.
163 * The order is significant; more secure, more proven later.
166 /** UNCHECKED means that object has yet to be validated. */
167 sec_status_unchecked = 0,
168 /** BOGUS means that the object (RRset or message) failed to validate
169 * (according to local policy), but should have validated. */
171 /** INDETERMINATE means that the object is insecure, but not
172 * authoritatively so. Generally this means that the RRset is not
173 * below a configured trust anchor. */
174 sec_status_indeterminate,
175 /** INSECURE means that the object is authoritatively known to be
176 * insecure. Generally this means that this RRset is below a trust
177 * anchor, but also below a verified, insecure delegation. */
179 /** SECURE means that the object (RRset or message) validated
180 * according to local policy. */
187 * The data is packed, stored contiguously in memory.
190 * o rr_len size_t array
191 * o rr_data uint8_t* array
192 * o rr_ttl time_t array (after size_t and ptrs because those may be
193 * 64bit and this array before those would make them unaligned).
194 * Since the stuff before is 32/64bit, rr_ttl is 32 bit aligned.
195 * o rr_data rdata wireformats
196 * o rrsig_data rdata wireformat(s)
198 * Rdata is stored in wireformat. The dname is stored in wireformat.
199 * TTLs are stored as absolute values (and could be expired).
201 * RRSIGs are stored in the arrays after the regular rrs.
203 * You need the packed_rrset_key to know dname, type, class of the
204 * resource records in this RRset. (if signed the rrsig gives the type too).
206 * On the wire an RR is:
207 * name, type, class, ttl, rdlength, rdata.
208 * So we need to send the following per RR:
209 * key.dname, ttl, rr_data[i].
210 * since key.dname ends with type and class.
211 * and rr_data starts with the rdlength.
212 * the ttl value to send changes due to time.
214 struct packed_rrset_data {
215 /** TTL (in seconds like time()) of the rrset.
216 * Same for all RRs see rfc2181(5.2). */
218 /** number of rrs. */
220 /** number of rrsigs, if 0 no rrsigs */
222 /** the trustworthiness of the rrset data */
223 enum rrset_trust trust;
224 /** security status of the rrset data */
225 enum sec_status security;
226 /** length of every rr's rdata, rr_len[i] is size of rr_data[i]. */
228 /** ttl of every rr. rr_ttl[i] ttl of rr i. */
231 * Array of pointers to every rr's rdata.
232 * The rr_data[i] rdata is stored in uncompressed wireformat.
233 * The first uint16_t of rr_data[i] is network format rdlength.
235 * rr_data[count] to rr_data[count+rrsig_count] contain the rrsig data.
241 * An RRset can be represented using both key and data together.
242 * Split into key and data structures to simplify implementation of
245 struct packed_rrset {
246 /** domain name, type and class */
247 struct packed_rrset_key* k;
248 /** ttl, count and rdatas (and rrsig) */
249 struct packed_rrset_data* d;
253 * list of packed rrsets
255 struct packed_rrset_list {
257 struct packed_rrset_list* next;
258 /** rrset key and data */
259 struct packed_rrset rrset;
263 * Delete packed rrset key and data, not entered in hashtables yet.
264 * Used during parsing.
265 * @param pkey: rrset key structure with locks, key and data pointers.
266 * @param alloc: where to return the unfree-able key structure.
268 void ub_packed_rrset_parsedelete(struct ub_packed_rrset_key* pkey,
269 struct alloc_cache* alloc);
272 * Memory size of rrset data. RRset data must be filled in correctly.
273 * @param data: data to examine.
274 * @return size in bytes.
276 size_t packed_rrset_sizeof(struct packed_rrset_data* data);
279 * Get TTL of rrset. RRset data must be filled in correctly.
280 * @param key: rrset key, with data to examine.
283 time_t ub_packed_rrset_ttl(struct ub_packed_rrset_key* key);
286 * Calculate memory size of rrset entry. For hash table usage.
287 * @param key: struct ub_packed_rrset_key*.
288 * @param data: struct packed_rrset_data*.
289 * @return size in bytes.
291 size_t ub_rrset_sizefunc(void* key, void* data);
294 * compares two rrset keys.
295 * @param k1: struct ub_packed_rrset_key*.
296 * @param k2: struct ub_packed_rrset_key*.
297 * @return 0 if equal.
299 int ub_rrset_compare(void* k1, void* k2);
302 * compare two rrset data structures.
303 * Compared rdata and rrsigdata, not the trust or ttl value.
304 * @param d1: data to compare.
305 * @param d2: data to compare.
306 * @return 1 if equal.
308 int rrsetdata_equal(struct packed_rrset_data* d1, struct packed_rrset_data* d2);
311 * Old key to be deleted. RRset keys are recycled via alloc.
312 * The id is set to 0. So that other threads, after acquiring a lock always
313 * get the correct value, in this case the 0 deleted-special value.
314 * @param key: struct ub_packed_rrset_key*.
315 * @param userdata: alloc structure to use for recycling.
317 void ub_rrset_key_delete(void* key, void* userdata);
320 * Old data to be deleted.
321 * @param data: what to delete.
322 * @param userdata: user data ptr.
324 void rrset_data_delete(void* data, void* userdata);
327 * Calculate hash value for a packed rrset key.
328 * @param key: the rrset key with name, type, class, flags.
329 * @return hash value.
331 hashvalue_t rrset_key_hash(struct packed_rrset_key* key);
334 * Fixup pointers in fixed data packed_rrset_data blob.
335 * After a memcpy of the data for example. Will set internal pointers right.
336 * @param data: rrset data structure. Otherwise correctly filled in.
338 void packed_rrset_ptr_fixup(struct packed_rrset_data* data);
341 * Fixup TTLs in fixed data packed_rrset_data blob.
342 * @param data: rrset data structure. Otherwise correctly filled in.
343 * @param add: how many seconds to add, pass time(0) for example.
345 void packed_rrset_ttl_add(struct packed_rrset_data* data, time_t add);
348 * Utility procedure to extract CNAME target name from its rdata.
349 * Failsafes; it will change passed dname to a valid dname or do nothing.
350 * @param rrset: the rrset structure. Must be a CNAME.
351 * Only first RR is used (multiple RRs are technically illegal anyway).
352 * Also works on type DNAME. Returns target name.
353 * @param dname: this pointer is updated to point into the cname rdata.
354 * If a failsafe fails, nothing happens to the pointer (such as the
355 * rdata was not a valid dname, not a CNAME, ...).
356 * @param dname_len: length of dname is returned.
358 void get_cname_target(struct ub_packed_rrset_key* rrset, uint8_t** dname,
362 * Get a printable string for a rrset trust value
363 * @param s: rrset trust value
364 * @return printable string.
366 const char* rrset_trust_to_string(enum rrset_trust s);
369 * Get a printable string for a security status value
370 * @param s: security status
371 * @return printable string.
373 const char* sec_status_to_string(enum sec_status s);
376 * Print string with neat domain name, type, class from rrset.
377 * @param v: at what verbosity level to print this.
378 * @param str: string of message.
379 * @param rrset: structure with name, type and class.
381 void log_rrset_key(enum verbosity_value v, const char* str,
382 struct ub_packed_rrset_key* rrset);
385 * Convert RR from RRset to string.
386 * @param rrset: structure with data.
387 * @param i: index of rr or RRSIG.
388 * @param now: time that is subtracted from ttl before printout. Can be 0.
389 * @param dest: destination string buffer. Must be nonNULL.
390 * @param dest_len: length of dest buffer (>0).
391 * @return false on failure.
393 int packed_rr_to_string(struct ub_packed_rrset_key* rrset, size_t i,
394 time_t now, char* dest, size_t dest_len);
397 * Print the string with prefix, one rr per line.
398 * @param v: at what verbosity level to print this.
399 * @param str: string of message.
400 * @param rrset: with name, and rdata, and rrsigs.
402 void log_packed_rrset(enum verbosity_value v, const char* str,
403 struct ub_packed_rrset_key* rrset);
406 * Allocate rrset in region - no more locks needed
407 * @param key: a (just from rrset cache looked up) rrset key + valid,
408 * packed data record.
409 * @param region: where to alloc the copy
410 * @param now: adjust the TTLs to be relative (subtract from all TTLs).
411 * @return new region-alloced rrset key or NULL on alloc failure.
413 struct ub_packed_rrset_key* packed_rrset_copy_region(
414 struct ub_packed_rrset_key* key, struct regional* region,
418 * Allocate rrset with malloc (from region or you are holding the lock).
419 * @param key: key with data entry.
420 * @param alloc: alloc_cache to create rrset_keys
421 * @param now: adjust the TTLs to be absolute (add to all TTLs).
422 * @return new region-alloced rrset key or NULL on alloc failure.
424 struct ub_packed_rrset_key* packed_rrset_copy_alloc(
425 struct ub_packed_rrset_key* key, struct alloc_cache* alloc,
428 #endif /* UTIL_DATA_PACKED_RRSET_H */