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 */
86 /** delegpt from authoritative zone that is locally hosted */
93 * Nameservers for a delegation point.
97 struct delegpt_ns* next;
98 /** name of nameserver */
100 /** length of name */
103 * If the name has been resolved. false if not queried for yet.
104 * true if the A, AAAA queries have been generated.
105 * marked true if those queries fail.
106 * and marked true if got4 and got6 are both true.
109 /** if the ipv4 address is in the delegpt */
111 /** if the ipv6 address is in the delegpt */
114 * If the name is parent-side only and thus dispreferred.
115 * Its addresses become dispreferred as well
118 /** if the parent-side ipv4 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. */
122 /** if the parent-side ipv6 address has been looked up (last resort).
123 * Also enabled if a parent-side cache entry exists, or a parent-side
124 * negative-cache entry exists. */
129 * Address of target nameserver in delegation point.
131 struct delegpt_addr {
132 /** next delegation point in results */
133 struct delegpt_addr* next_result;
134 /** next delegation point in usable list */
135 struct delegpt_addr* next_usable;
136 /** next delegation point in all targets list */
137 struct delegpt_addr* next_target;
139 /** delegation point address */
140 struct sockaddr_storage addr;
141 /** length of addr */
143 /** number of attempts for this addr */
145 /** rtt stored here in the selection algorithm */
147 /** if true, the A or AAAA RR was bogus, so this address is bad.
148 * Also check the dp->bogus to see if everything is bogus. */
150 /** if true, this address is dispreferred: it is a lame IP address */
152 /** if the address is dnsseclame, but this cannot be cached, this
153 * option is useful to mark the address dnsseclame.
154 * This value is not copied in addr-copy and dp-copy. */
156 /** the TLS authentication name, (if not NULL) to use. */
161 * Create new delegation point.
162 * @param regional: where to allocate it.
163 * @return new delegation point or NULL on error.
165 struct delegpt* delegpt_create(struct regional* regional);
168 * Create a copy of a delegation point.
169 * @param dp: delegation point to copy.
170 * @param regional: where to allocate it.
171 * @return new delegation point or NULL on error.
173 struct delegpt* delegpt_copy(struct delegpt* dp, struct regional* regional);
176 * Set name of delegation point.
177 * @param dp: delegation point.
178 * @param regional: where to allocate the name copy.
179 * @param name: name to use.
180 * @return false on error.
182 int delegpt_set_name(struct delegpt* dp, struct regional* regional,
186 * Add a name to the delegation point.
187 * @param dp: delegation point.
188 * @param regional: where to allocate the info.
189 * @param name: domain name in wire format.
190 * @param lame: name is lame, disprefer it.
191 * @return false on error.
193 int delegpt_add_ns(struct delegpt* dp, struct regional* regional,
194 uint8_t* name, uint8_t lame);
197 * Add NS rrset; calls add_ns repeatedly.
198 * @param dp: delegation point.
199 * @param regional: where to allocate the info.
200 * @param ns_rrset: NS rrset.
201 * @param lame: rrset is lame, disprefer it.
202 * @return 0 on alloc error.
204 int delegpt_rrset_add_ns(struct delegpt* dp, struct regional* regional,
205 struct ub_packed_rrset_key* ns_rrset, uint8_t lame);
208 * Add target address to the delegation point.
209 * @param dp: delegation point.
210 * @param regional: where to allocate the info.
211 * @param name: name for which target was found (must be in nslist).
212 * This name is marked resolved.
213 * @param namelen: length of name.
214 * @param addr: the address.
215 * @param addrlen: the length of addr.
216 * @param bogus: security status for the address, pass true if bogus.
217 * @param lame: address is lame.
218 * @return false on error.
220 int delegpt_add_target(struct delegpt* dp, struct regional* regional,
221 uint8_t* name, size_t namelen, struct sockaddr_storage* addr,
222 socklen_t addrlen, uint8_t bogus, uint8_t lame);
225 * Add A RRset to delegpt.
226 * @param dp: delegation point.
227 * @param regional: where to allocate the info.
228 * @param rrset: RRset A to add.
229 * @param lame: rrset is lame, disprefer it.
230 * @return 0 on alloc error.
232 int delegpt_add_rrset_A(struct delegpt* dp, struct regional* regional,
233 struct ub_packed_rrset_key* rrset, uint8_t lame);
236 * Add AAAA RRset to delegpt.
237 * @param dp: delegation point.
238 * @param regional: where to allocate the info.
239 * @param rrset: RRset AAAA to add.
240 * @param lame: rrset is lame, disprefer it.
241 * @return 0 on alloc error.
243 int delegpt_add_rrset_AAAA(struct delegpt* dp, struct regional* regional,
244 struct ub_packed_rrset_key* rrset, uint8_t lame);
247 * Add any RRset to delegpt.
248 * Does not check for duplicates added.
249 * @param dp: delegation point.
250 * @param regional: where to allocate the info.
251 * @param rrset: RRset to add, NS, A, AAAA.
252 * @param lame: rrset is lame, disprefer it.
253 * @return 0 on alloc error.
255 int delegpt_add_rrset(struct delegpt* dp, struct regional* regional,
256 struct ub_packed_rrset_key* rrset, uint8_t lame);
259 * Add address to the delegation point. No servername is associated or checked.
260 * @param dp: delegation point.
261 * @param regional: where to allocate the info.
262 * @param addr: the address.
263 * @param addrlen: the length of addr.
264 * @param bogus: if address is bogus.
265 * @param lame: if address is lame.
266 * @param tls_auth_name: TLS authentication name (or NULL).
267 * @return false on error.
269 int delegpt_add_addr(struct delegpt* dp, struct regional* regional,
270 struct sockaddr_storage* addr, socklen_t addrlen,
271 uint8_t bogus, uint8_t lame, char* tls_auth_name);
274 * Find NS record in name list of delegation point.
275 * @param dp: delegation point.
276 * @param name: name of nameserver to look for, uncompressed wireformat.
277 * @param namelen: length of name.
278 * @return the ns structure or NULL if not found.
280 struct delegpt_ns* delegpt_find_ns(struct delegpt* dp, uint8_t* name,
284 * Find address record in total list of delegation point.
285 * @param dp: delegation point.
286 * @param addr: address
287 * @param addrlen: length of addr
288 * @return the addr structure or NULL if not found.
290 struct delegpt_addr* delegpt_find_addr(struct delegpt* dp,
291 struct sockaddr_storage* addr, socklen_t addrlen);
294 * Print the delegation point to the log. For debugging.
295 * @param v: verbosity value that is needed to emit to log.
296 * @param dp: delegation point.
298 void delegpt_log(enum verbosity_value v, struct delegpt* dp);
300 /** count NS and number missing for logging */
301 void delegpt_count_ns(struct delegpt* dp, size_t* numns, size_t* missing);
303 /** count addresses, and number in result and available lists, for logging */
304 void delegpt_count_addr(struct delegpt* dp, size_t* numaddr, size_t* numres,
308 * Add all usable targets to the result list.
309 * @param dp: delegation point.
311 void delegpt_add_unused_targets(struct delegpt* dp);
314 * Count number of missing targets. These are ns names with no resolved flag.
315 * @param dp: delegation point.
316 * @return number of missing targets (or 0).
318 size_t delegpt_count_missing_targets(struct delegpt* dp);
320 /** count total number of targets in dp */
321 size_t delegpt_count_targets(struct delegpt* dp);
324 * Create new delegation point from a dns message
326 * Note that this method does not actually test to see if the message is an
327 * actual referral. It really is just checking to see if it can construct a
328 * delegation point, so the message could be of some other type (some ANSWER
329 * messages, some CNAME messages, generally.) Note that the resulting
330 * DelegationPoint will contain targets for all "relevant" glue (i.e.,
331 * address records whose ownernames match the target of one of the NS
332 * records), so if policy dictates that some glue should be discarded beyond
333 * that, discard it before calling this method. Note that this method will
334 * find "glue" in either the ADDITIONAL section or the ANSWER section.
336 * @param msg: the dns message, referral.
337 * @param regional: where to allocate delegation point.
338 * @return new delegation point or NULL on alloc error, or if the
339 * message was not appropriate.
341 struct delegpt* delegpt_from_message(struct dns_msg* msg,
342 struct regional* regional);
345 * Add negative message to delegation point.
346 * @param dp: delegation point.
347 * @param msg: the message added, marks off A or AAAA from an NS entry.
349 void delegpt_add_neg_msg(struct delegpt* dp, struct msgreply_entry* msg);
352 * Register the fact that there is no ipv6 and thus AAAAs are not going
353 * to be queried for or be useful.
354 * @param dp: the delegation point. Updated to reflect no ipv6.
356 void delegpt_no_ipv6(struct delegpt* dp);
359 * Register the fact that there is no ipv4 and thus As are not going
360 * to be queried for or be useful.
361 * @param dp: the delegation point. Updated to reflect no ipv4.
363 void delegpt_no_ipv4(struct delegpt* dp);
366 * create malloced delegation point, with the given name
367 * @param name: uncompressed wireformat of delegpt name.
368 * @return NULL on alloc failure
370 struct delegpt* delegpt_create_mlc(uint8_t* name);
373 * free malloced delegation point.
374 * @param dp: must have been created with delegpt_create_mlc, free'd.
376 void delegpt_free_mlc(struct delegpt* dp);
379 * Set name of delegation point.
380 * @param dp: delegation point. malloced.
381 * @param name: name to use.
382 * @return false on error.
384 int delegpt_set_name_mlc(struct delegpt* dp, uint8_t* name);
387 * add a name to malloced delegation point.
388 * @param dp: must have been created with delegpt_create_mlc.
389 * @param name: the name to add.
390 * @param lame: the name is lame, disprefer.
391 * @return false on error.
393 int delegpt_add_ns_mlc(struct delegpt* dp, uint8_t* name, uint8_t lame);
396 * add an address to a malloced delegation point.
397 * @param dp: must have been created with delegpt_create_mlc.
398 * @param addr: the address.
399 * @param addrlen: the length of addr.
400 * @param bogus: if address is bogus.
401 * @param lame: if address is lame.
402 * @param tls_auth_name: TLS authentication name (or NULL).
403 * @return false on error.
405 int delegpt_add_addr_mlc(struct delegpt* dp, struct sockaddr_storage* addr,
406 socklen_t addrlen, uint8_t bogus, uint8_t lame, char* tls_auth_name);
409 * Add target address to the delegation point.
410 * @param dp: must have been created with delegpt_create_mlc.
411 * @param name: name for which target was found (must be in nslist).
412 * This name is marked resolved.
413 * @param namelen: length of name.
414 * @param addr: the address.
415 * @param addrlen: the length of addr.
416 * @param bogus: security status for the address, pass true if bogus.
417 * @param lame: address is lame.
418 * @return false on error.
420 int delegpt_add_target_mlc(struct delegpt* dp, uint8_t* name, size_t namelen,
421 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t bogus,
424 /** get memory in use by dp */
425 size_t delegpt_get_mem(struct delegpt* dp);
427 #endif /* ITERATOR_ITER_DELEGPT_H */