2 * iterator/iter_delegpt.h - delegation point with NS and address information.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
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39 * This file implements the Delegation Point. It contains a list of name servers
40 * and their addresses if known.
43 #ifndef ITERATOR_ITER_DELEGPT_H
44 #define ITERATOR_ITER_DELEGPT_H
50 struct ub_packed_rrset_key;
51 struct msgreply_entry;
55 * For a domain name, the NS rrset, and the A and AAAA records for those.
58 /** the domain name of the delegation point. */
60 /** length of the delegation point name */
62 /** number of labels in delegation point */
65 /** the nameservers, names from the NS RRset rdata. */
66 struct delegpt_ns* nslist;
67 /** the target addresses for delegation */
68 struct delegpt_addr* target_list;
69 /** the list of usable targets; subset of target_list
70 * the items in this list are not part of the result list. */
71 struct delegpt_addr* usable_list;
72 /** the list of returned targets; subset of target_list */
73 struct delegpt_addr* result_list;
75 /** if true, the NS RRset was bogus. All info is bad. */
77 /** if true, the parent-side NS record has been applied:
78 * its names have been added and their addresses can follow later.
79 * Also true if the delegationpoint was created from a delegation
80 * message and thus contains the parent-side-info already. */
81 uint8_t has_parent_side_NS;
82 /** for assertions on type of delegpt */
84 /** use SSL for upstream query */
89 * Nameservers for a delegation point.
93 struct delegpt_ns* next;
94 /** name of nameserver */
99 * If the name has been resolved. false if not queried for yet.
100 * true if the A, AAAA queries have been generated.
101 * marked true if those queries fail.
102 * and marked true if got4 and got6 are both true.
105 /** if the ipv4 address is in the delegpt */
107 /** if the ipv6 address is in the delegpt */
110 * If the name is parent-side only and thus dispreferred.
111 * Its addresses become dispreferred as well
114 /** if the parent-side ipv4 address has been looked up (last resort).
115 * Also enabled if a parent-side cache entry exists, or a parent-side
116 * negative-cache entry exists. */
118 /** if the parent-side ipv6 address has been looked up (last resort).
119 * Also enabled if a parent-side cache entry exists, or a parent-side
120 * negative-cache entry exists. */
125 * Address of target nameserver in delegation point.
127 struct delegpt_addr {
128 /** next delegation point in results */
129 struct delegpt_addr* next_result;
130 /** next delegation point in usable list */
131 struct delegpt_addr* next_usable;
132 /** next delegation point in all targets list */
133 struct delegpt_addr* next_target;
135 /** delegation point address */
136 struct sockaddr_storage addr;
137 /** length of addr */
139 /** number of attempts for this addr */
141 /** rtt stored here in the selection algorithm */
143 /** if true, the A or AAAA RR was bogus, so this address is bad.
144 * Also check the dp->bogus to see if everything is bogus. */
146 /** if true, this address is dispreferred: it is a lame IP address */
148 /** if the address is dnsseclame, but this cannot be cached, this
149 * option is useful to mark the address dnsseclame.
150 * This value is not copied in addr-copy and dp-copy. */
155 * Create new delegation point.
156 * @param regional: where to allocate it.
157 * @return new delegation point or NULL on error.
159 struct delegpt* delegpt_create(struct regional* regional);
162 * Create a copy of a delegation point.
163 * @param dp: delegation point to copy.
164 * @param regional: where to allocate it.
165 * @return new delegation point or NULL on error.
167 struct delegpt* delegpt_copy(struct delegpt* dp, struct regional* regional);
170 * Set name of delegation point.
171 * @param dp: delegation point.
172 * @param regional: where to allocate the name copy.
173 * @param name: name to use.
174 * @return false on error.
176 int delegpt_set_name(struct delegpt* dp, struct regional* regional,
180 * Add a name to the delegation point.
181 * @param dp: delegation point.
182 * @param regional: where to allocate the info.
183 * @param name: domain name in wire format.
184 * @param lame: name is lame, disprefer it.
185 * @return false on error.
187 int delegpt_add_ns(struct delegpt* dp, struct regional* regional,
188 uint8_t* name, uint8_t lame);
191 * Add NS rrset; calls add_ns repeatedly.
192 * @param dp: delegation point.
193 * @param regional: where to allocate the info.
194 * @param ns_rrset: NS rrset.
195 * @param lame: rrset is lame, disprefer it.
196 * @return 0 on alloc error.
198 int delegpt_rrset_add_ns(struct delegpt* dp, struct regional* regional,
199 struct ub_packed_rrset_key* ns_rrset, uint8_t lame);
202 * Add target address to the delegation point.
203 * @param dp: delegation point.
204 * @param regional: where to allocate the info.
205 * @param name: name for which target was found (must be in nslist).
206 * This name is marked resolved.
207 * @param namelen: length of name.
208 * @param addr: the address.
209 * @param addrlen: the length of addr.
210 * @param bogus: security status for the address, pass true if bogus.
211 * @param lame: address is lame.
212 * @return false on error.
214 int delegpt_add_target(struct delegpt* dp, struct regional* regional,
215 uint8_t* name, size_t namelen, struct sockaddr_storage* addr,
216 socklen_t addrlen, uint8_t bogus, uint8_t lame);
219 * Add A RRset to delegpt.
220 * @param dp: delegation point.
221 * @param regional: where to allocate the info.
222 * @param rrset: RRset A to add.
223 * @param lame: rrset is lame, disprefer it.
224 * @return 0 on alloc error.
226 int delegpt_add_rrset_A(struct delegpt* dp, struct regional* regional,
227 struct ub_packed_rrset_key* rrset, uint8_t lame);
230 * Add AAAA RRset to delegpt.
231 * @param dp: delegation point.
232 * @param regional: where to allocate the info.
233 * @param rrset: RRset AAAA to add.
234 * @param lame: rrset is lame, disprefer it.
235 * @return 0 on alloc error.
237 int delegpt_add_rrset_AAAA(struct delegpt* dp, struct regional* regional,
238 struct ub_packed_rrset_key* rrset, uint8_t lame);
241 * Add any RRset to delegpt.
242 * Does not check for duplicates added.
243 * @param dp: delegation point.
244 * @param regional: where to allocate the info.
245 * @param rrset: RRset to add, NS, A, AAAA.
246 * @param lame: rrset is lame, disprefer it.
247 * @return 0 on alloc error.
249 int delegpt_add_rrset(struct delegpt* dp, struct regional* regional,
250 struct ub_packed_rrset_key* rrset, uint8_t lame);
253 * Add address to the delegation point. No servername is associated or checked.
254 * @param dp: delegation point.
255 * @param regional: where to allocate the info.
256 * @param addr: the address.
257 * @param addrlen: the length of addr.
258 * @param bogus: if address is bogus.
259 * @param lame: if address is lame.
260 * @return false on error.
262 int delegpt_add_addr(struct delegpt* dp, struct regional* regional,
263 struct sockaddr_storage* addr, socklen_t addrlen,
264 uint8_t bogus, uint8_t lame);
267 * Find NS record in name list of delegation point.
268 * @param dp: delegation point.
269 * @param name: name of nameserver to look for, uncompressed wireformat.
270 * @param namelen: length of name.
271 * @return the ns structure or NULL if not found.
273 struct delegpt_ns* delegpt_find_ns(struct delegpt* dp, uint8_t* name,
277 * Find address record in total list of delegation point.
278 * @param dp: delegation point.
279 * @param addr: address
280 * @param addrlen: length of addr
281 * @return the addr structure or NULL if not found.
283 struct delegpt_addr* delegpt_find_addr(struct delegpt* dp,
284 struct sockaddr_storage* addr, socklen_t addrlen);
287 * Print the delegation point to the log. For debugging.
288 * @param v: verbosity value that is needed to emit to log.
289 * @param dp: delegation point.
291 void delegpt_log(enum verbosity_value v, struct delegpt* dp);
293 /** count NS and number missing for logging */
294 void delegpt_count_ns(struct delegpt* dp, size_t* numns, size_t* missing);
296 /** count addresses, and number in result and available lists, for logging */
297 void delegpt_count_addr(struct delegpt* dp, size_t* numaddr, size_t* numres,
301 * Add all usable targets to the result list.
302 * @param dp: delegation point.
304 void delegpt_add_unused_targets(struct delegpt* dp);
307 * Count number of missing targets. These are ns names with no resolved flag.
308 * @param dp: delegation point.
309 * @return number of missing targets (or 0).
311 size_t delegpt_count_missing_targets(struct delegpt* dp);
313 /** count total number of targets in dp */
314 size_t delegpt_count_targets(struct delegpt* dp);
317 * Create new delegation point from a dns message
319 * Note that this method does not actually test to see if the message is an
320 * actual referral. It really is just checking to see if it can construct a
321 * delegation point, so the message could be of some other type (some ANSWER
322 * messages, some CNAME messages, generally.) Note that the resulting
323 * DelegationPoint will contain targets for all "relevant" glue (i.e.,
324 * address records whose ownernames match the target of one of the NS
325 * records), so if policy dictates that some glue should be discarded beyond
326 * that, discard it before calling this method. Note that this method will
327 * find "glue" in either the ADDITIONAL section or the ANSWER section.
329 * @param msg: the dns message, referral.
330 * @param regional: where to allocate delegation point.
331 * @return new delegation point or NULL on alloc error, or if the
332 * message was not appropriate.
334 struct delegpt* delegpt_from_message(struct dns_msg* msg,
335 struct regional* regional);
338 * Add negative message to delegation point.
339 * @param dp: delegation point.
340 * @param msg: the message added, marks off A or AAAA from an NS entry.
342 void delegpt_add_neg_msg(struct delegpt* dp, struct msgreply_entry* msg);
345 * Register the fact that there is no ipv6 and thus AAAAs are not going
346 * to be queried for or be useful.
347 * @param dp: the delegation point. Updated to reflect no ipv6.
349 void delegpt_no_ipv6(struct delegpt* dp);
352 * Register the fact that there is no ipv4 and thus As are not going
353 * to be queried for or be useful.
354 * @param dp: the delegation point. Updated to reflect no ipv4.
356 void delegpt_no_ipv4(struct delegpt* dp);
359 * create malloced delegation point, with the given name
360 * @param name: uncompressed wireformat of delegpt name.
361 * @return NULL on alloc failure
363 struct delegpt* delegpt_create_mlc(uint8_t* name);
366 * free malloced delegation point.
367 * @param dp: must have been created with delegpt_create_mlc, free'd.
369 void delegpt_free_mlc(struct delegpt* dp);
372 * Set name of delegation point.
373 * @param dp: delegation point. malloced.
374 * @param name: name to use.
375 * @return false on error.
377 int delegpt_set_name_mlc(struct delegpt* dp, uint8_t* name);
380 * add a name to malloced delegation point.
381 * @param dp: must have been created with delegpt_create_mlc.
382 * @param name: the name to add.
383 * @param lame: the name is lame, disprefer.
384 * @return false on error.
386 int delegpt_add_ns_mlc(struct delegpt* dp, uint8_t* name, uint8_t lame);
389 * add an address to a malloced delegation point.
390 * @param dp: must have been created with delegpt_create_mlc.
391 * @param addr: the address.
392 * @param addrlen: the length of addr.
393 * @param bogus: if address is bogus.
394 * @param lame: if address is lame.
395 * @return false on error.
397 int delegpt_add_addr_mlc(struct delegpt* dp, struct sockaddr_storage* addr,
398 socklen_t addrlen, uint8_t bogus, uint8_t lame);
401 * Add target address to the delegation point.
402 * @param dp: must have been created with delegpt_create_mlc.
403 * @param name: name for which target was found (must be in nslist).
404 * This name is marked resolved.
405 * @param namelen: length of name.
406 * @param addr: the address.
407 * @param addrlen: the length of addr.
408 * @param bogus: security status for the address, pass true if bogus.
409 * @param lame: address is lame.
410 * @return false on error.
412 int delegpt_add_target_mlc(struct delegpt* dp, uint8_t* name, size_t namelen,
413 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t bogus,
416 /** get memory in use by dp */
417 size_t delegpt_get_mem(struct delegpt* dp);
419 #endif /* ITERATOR_ITER_DELEGPT_H */