2 * services/authzone.h - authoritative zone that is locally hosted.
4 * Copyright (c) 2017, NLnet Labs. All rights reserved.
6 * This software is open source.
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39 * This file contains the functions for an authority zone. This zone
40 * is queried by the iterator, just like a stub or forward zone, but then
41 * the data is locally held.
44 #ifndef SERVICES_AUTHZONE_H
45 #define SERVICES_AUTHZONE_H
46 #include "util/rbtree.h"
47 #include "util/locks.h"
48 #include "services/mesh.h"
49 struct ub_packed_rrset_key;
62 struct auth_nextprobe;
69 * Authoritative zones, shared.
72 /** lock on the authzone trees */
74 /** rbtree of struct auth_zone */
76 /** rbtree of struct auth_xfer */
78 /** do we have downstream enabled */
80 /** number of queries upstream */
82 /** number of queries downstream */
83 size_t num_query_down;
87 * Auth zone. Authoritative data, that is fetched from instead of sending
88 * packets to the internet.
91 /** rbtree node, key is name and class */
94 /** zone name, in uncompressed wireformat */
96 /** length of zone name */
98 /** number of labels in zone name */
100 /** the class of this zone, in host byteorder.
101 * uses 'dclass' to not conflict with c++ keyword class. */
104 /** lock on the data in the structure
105 * For the node, parent, name, namelen, namelabs, dclass, you
106 * need to also hold the zones_tree lock to change them (or to
107 * delete this zone) */
110 /** auth data for this zone
111 * rbtree of struct auth_data */
114 /** zonefile name (or NULL for no zonefile) */
116 /** fallback to the internet on failure or ttl-expiry of auth zone */
117 int fallback_enabled;
118 /** the zone has expired (enabled by the xfer worker), fallback
119 * happens if that option is enabled. */
121 /** zone is a slave zone (it has masters) */
123 /** for downstream: this zone answers queries towards the downstream
126 /** for upstream: this zone answers queries that unbound intends to
129 /** zone has been deleted */
131 /** deletelist pointer, unused normally except during delete */
132 struct auth_zone* delete_next;
136 * Auth data. One domain name, and the RRs to go with it.
139 /** rbtree node, key is name only */
143 /** length of name */
145 /** number of labels in name */
147 /** the data rrsets, with different types, linked list.
148 * if the list if NULL the node would be an empty non-terminal,
149 * but in this data structure such nodes that represent an empty
150 * non-terminal are not needed; they just don't exist.
152 struct auth_rrset* rrsets;
160 struct auth_rrset* next;
161 /** RR type in host byteorder */
163 /** RRset data item */
164 struct packed_rrset_data* data;
168 * Authoritative zone transfer structure.
169 * Create and destroy needs the auth_zones* biglock.
170 * The structure consists of different tasks. Each can be unowned (-1) or
171 * owner by a worker (worker-num). A worker can pick up a task and then do
172 * it. This means the events (timeouts, sockets) are for that worker.
174 * (move this to tasks).
175 * They don't have locks themselves, the worker (that owns it) uses it,
176 * also as part of callbacks, hence it has separate zonename pointers for
177 * lookup in the main zonetree. If the zone has no transfers, this
178 * structure is not created.
181 /** rbtree node, key is name and class */
184 /** lock on this structure, and on the workernum elements of the
185 * tasks. First hold the tree-lock in auth_zones, find the auth_xfer,
186 * lock this lock. Then a worker can reassign itself to fill up
188 * Once it has the task assigned to it, the worker can access the
189 * other elements of the task structure without a lock, because that
190 * is necessary for the eventloop and callbacks from that. */
191 lock_basic_type lock;
193 /** zone name, in uncompressed wireformat */
195 /** length of zone name */
197 /** number of labels in zone name */
199 /** the class of this zone, in host byteorder.
200 * uses 'dclass' to not conflict with c++ keyword class. */
203 /** task to wait for next-probe-timeout,
204 * once timeouted, see if a SOA probe is needed, or already
206 struct auth_nextprobe* task_nextprobe;
208 /** task for SOA probe. Check if the zone can be updated */
209 struct auth_probe* task_probe;
211 /** Task for transfer. Transferring and updating the zone. This
212 * includes trying (potentially) several upstream masters. Downloading
213 * and storing the zone */
214 struct auth_transfer* task_transfer;
216 /** a notify was received, but a zone transfer or probe was already
218 * However, the zone transfer could signal a newer serial number.
219 * The serial number of that notify is saved below. The transfer and
220 * probe tasks should check this once done to see if they need to
221 * restart the transfer task for the newer notify serial.
222 * Hold the lock to access this member (and the serial).
225 /** true if the notify_received has a serial number */
226 int notify_has_serial;
227 /** serial number of the notify */
228 uint32_t notify_serial;
229 /** the list of masters for checking notifies. This list is
230 * empty on start, and a copy of the list from the probe_task when
231 * it is done looking them up. */
232 struct auth_master* allow_notify_list;
234 /* protected by the lock on the structure, information about
235 * the loaded authority zone. */
236 /** is the zone currently considered expired? after expiry also older
237 * serial numbers are allowed (not just newer) */
239 /** do we have a zone (if 0, no zone data at all) */
242 /** current serial (from SOA), if we have no zone, 0 */
244 /** retry time (from SOA), time to wait with next_probe
245 * if no master responds */
247 /** refresh time (from SOA), time to wait with next_probe
248 * if everything is fine */
250 /** expiry time (from SOA), time until zone data is not considered
251 * valid any more, if no master responds within this time, either
252 * with the current zone or a new zone. */
255 /** zone lease start time (start+expiry is expiration time).
256 * this is renewed every SOA probe and transfer. On zone load
257 * from zonefile it is also set (with probe set soon to check) */
262 * The next probe task.
263 * This task consists of waiting for the probetimeout. It is a task because
264 * it needs an event in the eventtable. Once the timeout has passed, that
265 * worker can (potentially) become the auth_probe worker, or if another worker
266 * is already doing that, do nothing. Tasks becomes unowned.
267 * The probe worker, if it detects nothing has to be done picks up this task,
270 struct auth_nextprobe {
271 /* Worker pointer. NULL means unowned. */
272 struct worker* worker;
273 /* module env for this task */
274 struct module_env* env;
276 /** increasing backoff for failures */
278 /** Timeout for next probe (for SOA) */
280 /** timeout callback for next_probe or expiry(if that is sooner).
281 * it is on the worker's event_base */
282 struct comm_timer* timer;
287 * Send a SOA UDP query to see if the zone needs to be updated (or similar,
288 * potential, HTTP probe query) and check serial number.
289 * If yes, start the auth_transfer task. If no, make sure auth_nextprobe
290 * timeout wait task is running.
291 * Needs to be a task, because the UDP query needs an event entry.
292 * This task could also be started by eg. a NOTIFY being received, even though
293 * another worker is performing the nextprobe task (and that worker keeps
294 * waiting uninterrupted).
297 /* Worker pointer. NULL means unowned. */
298 struct worker* worker;
299 /* module env for this task */
300 struct module_env* env;
302 /** list of upstream masters for this zone, from config */
303 struct auth_master* masters;
305 /** for the hostname lookups, which master is current */
306 struct auth_master* lookup_target;
307 /** are we looking up A or AAAA, first A, then AAAA (if ip6 enabled) */
309 /** we only want to do lookups for making config work (for notify),
310 * don't proceed with UDP SOA probe queries */
312 /** we have seen a new lease this scan, because one of the masters
313 * replied with the current SOA serial version */
316 /** once notified, or the timeout has been reached. a scan starts. */
317 /** the scan specific target (notify source), or NULL if none */
318 struct auth_master* scan_specific;
319 /** scan tries all the upstream masters. the scan current target.
320 * or NULL if not working on sequential scan */
321 struct auth_master* scan_target;
322 /** if not NULL, the specific addr for the current master */
323 struct auth_addr* scan_addr;
325 /** dns id of packet in flight */
327 /** the SOA probe udp event.
328 * on the workers event base. */
329 struct comm_point* cp;
330 /** timeout for packets.
331 * on the workers event base. */
332 struct comm_timer* timer;
333 /** timeout in msec */
339 * Once done, make sure the nextprobe waiting task is running, whether done
340 * with failure or success. If failure, use shorter timeout for wait time.
342 struct auth_transfer {
343 /* Worker pointer. NULL means unowned. */
344 struct worker* worker;
345 /* module env for this task */
346 struct module_env* env;
348 /** xfer data that has been transferred, the data is applied
349 * once the transfer has completed correctly */
350 struct auth_chunk* chunks_first;
351 /** last element in chunks list (to append new data at the end) */
352 struct auth_chunk* chunks_last;
354 /** list of upstream masters for this zone, from config */
355 struct auth_master* masters;
357 /** for the hostname lookups, which master is current */
358 struct auth_master* lookup_target;
359 /** are we looking up A or AAAA, first A, then AAAA (if ip6 enabled) */
362 /** once notified, or the timeout has been reached. a scan starts. */
363 /** the scan specific target (notify source), or NULL if none */
364 struct auth_master* scan_specific;
365 /** scan tries all the upstream masters. the scan current target.
366 * or NULL if not working on sequential scan */
367 struct auth_master* scan_target;
368 /** what address we are scanning for the master, or NULL if the
369 * master is in IP format itself */
370 struct auth_addr* scan_addr;
371 /** the zone transfer in progress (or NULL if in scan). It is
372 * from this master */
373 struct auth_master* master;
375 /** failed ixfr transfer, retry with axfr (to the current master),
376 * the IXFR was 'REFUSED', 'SERVFAIL', 'NOTIMPL' or the contents of
377 * the IXFR did not apply cleanly (out of sync, delete of nonexistent
378 * data or add of duplicate data). Flag is cleared once the retry
379 * with axfr is done. */
381 /** we saw an ixfr-indicating timeout, count of them */
382 int ixfr_possible_timeout_count;
383 /** we are doing IXFR right now */
385 /** did we detect the current AXFR/IXFR serial number yet, 0 not yet,
386 * 1 we saw the first, 2 we saw the second, 3 must be last SOA in xfr*/
388 /** number of RRs scanned for AXFR/IXFR detection */
390 /** we are doing an IXFR but we detected an AXFR contents */
392 /** the serial number for the current AXFR/IXFR incoming reply,
393 * for IXFR, the outermost SOA records serial */
394 uint32_t incoming_xfr_serial;
396 /** dns id of AXFR query */
398 /** the transfer (TCP) to the master.
399 * on the workers event base. */
400 struct comm_point* cp;
403 /** list of addresses */
406 struct auth_addr* next;
408 struct sockaddr_storage addr;
413 /** auth zone master upstream, and the config settings for it */
415 /** next master in list */
416 struct auth_master* next;
417 /** master IP address (and port), or hostname, string */
419 /** for http, filename */
421 /** use HTTP for this master */
423 /** use IXFR for this master */
425 /** this is an allow notify member, the master can send notifies
426 * to us, but we don't send SOA probes, or zone transfer from it */
428 /** use ssl for channel */
430 /** the port number (for urls) */
432 /** if the host is a hostname, the list of resolved addrs, if any*/
433 struct auth_addr* list;
436 /** auth zone master zone transfer data chunk */
438 /** next chunk in list */
439 struct auth_chunk* next;
440 /** the data from this chunk, this is what was received.
441 * for an IXFR that means results from comm_net tcp actions,
442 * packets. also for an AXFR. For HTTP a zonefile chunk. */
444 /** length of allocated data */
449 * Create auth zones structure
451 struct auth_zones* auth_zones_create(void);
454 * Apply configuration to auth zones. Reads zonefiles.
455 * @param az: auth zones structure
456 * @param cfg: config to apply.
457 * @param setup: if true, also sets up values in the auth zones structure
458 * @return false on failure.
460 int auth_zones_apply_cfg(struct auth_zones* az, struct config_file* cfg,
463 /** initial pick up of worker timeouts, ties events to worker event loop
464 * @param az: auth zones structure
465 * @param env: worker env, of first worker that receives the events (if any)
468 void auth_xfer_pickup_initial(struct auth_zones* az, struct module_env* env);
471 * Cleanup auth zones. This removes all events from event bases.
472 * Stops the xfr tasks. But leaves zone data.
473 * @param az: auth zones structure.
475 void auth_zones_cleanup(struct auth_zones* az);
478 * Delete auth zones structure
480 void auth_zones_delete(struct auth_zones* az);
483 * Write auth zone data to file, in zonefile format.
485 int auth_zone_write_file(struct auth_zone* z, const char* fname);
488 * Use auth zones to lookup the answer to a query.
489 * The query is from the iterator. And the auth zones attempts to provide
490 * the answer instead of going to the internet.
492 * @param az: auth zones structure.
493 * @param qinfo: query info to lookup.
494 * @param region: region to use to allocate the reply in.
495 * @param msg: reply is stored here (if one).
496 * @param fallback: if true, fallback to making a query to the internet.
497 * @param dp_nm: name of delegation point to look for. This zone is used
498 * to answer the query.
499 * If the dp_nm is not found, fallback is set to true and false returned.
500 * @param dp_nmlen: length of dp_nm.
501 * @return 0: failure (an error of some sort, like servfail).
502 * if 0 and fallback is true, fallback to the internet.
503 * if 0 and fallback is false, like getting servfail.
504 * If true, an answer is available.
506 int auth_zones_lookup(struct auth_zones* az, struct query_info* qinfo,
507 struct regional* region, struct dns_msg** msg, int* fallback,
508 uint8_t* dp_nm, size_t dp_nmlen);
511 * Answer query from auth zone. Create authoritative answer.
512 * @param az: auth zones structure.
513 * @param env: the module environment.
514 * @param qinfo: query info (parsed).
515 * @param edns: edns info (parsed).
516 * @param buf: buffer with query ID and flags, also for reply.
517 * @param repinfo: reply information for a communication point.
518 * @param temp: temporary storage region.
519 * @return false if not answered
521 int auth_zones_answer(struct auth_zones* az, struct module_env* env,
522 struct query_info* qinfo, struct edns_data* edns,
523 struct comm_reply* repinfo, struct sldns_buffer* buf, struct regional* temp);
526 * Find the auth zone that is above the given qname.
527 * Return NULL when there is no auth_zone above the give name, otherwise
528 * returns the closest auth_zone above the qname that pertains to it.
529 * @param az: auth zones structure.
530 * @param name: query to look up for.
531 * @param name_len: length of name.
532 * @param dclass: class of zone to find.
533 * @return NULL or auth_zone that pertains to the query.
535 struct auth_zone* auth_zones_find_zone(struct auth_zones* az,
536 uint8_t* name, size_t name_len, uint16_t dclass);
538 /** find an auth zone by name (exact match by name or NULL returned) */
539 struct auth_zone* auth_zone_find(struct auth_zones* az, uint8_t* nm,
540 size_t nmlen, uint16_t dclass);
542 /** find an xfer zone by name (exact match by name or NULL returned) */
543 struct auth_xfer* auth_xfer_find(struct auth_zones* az, uint8_t* nm,
544 size_t nmlen, uint16_t dclass);
546 /** create an auth zone. returns wrlocked zone. caller must have wrlock
547 * on az. returns NULL on malloc failure */
548 struct auth_zone* auth_zone_create(struct auth_zones* az, uint8_t* nm,
549 size_t nmlen, uint16_t dclass);
551 /** set auth zone zonefile string. caller must have lock on zone */
552 int auth_zone_set_zonefile(struct auth_zone* z, char* zonefile);
554 /** set auth zone fallback. caller must have lock on zone.
555 * fallbackstr is "yes" or "no". false on parse failure. */
556 int auth_zone_set_fallback(struct auth_zone* z, char* fallbackstr);
558 /** see if the auth zone for the name can fallback
559 * @param az: auth zones
560 * @param nm: name of delegation point.
561 * @param nmlen: length of nm.
562 * @param dclass: class of zone to look for.
563 * @return true if fallback_enabled is true. false if not.
564 * if the zone does not exist, fallback is true (more lenient)
565 * also true if zone does not do upstream requests.
567 int auth_zones_can_fallback(struct auth_zones* az, uint8_t* nm, size_t nmlen,
570 /** process notify for auth zones.
571 * first checks the access list. Then processes the notify. This starts
572 * the probe sequence or it notes the serial number (if any)
573 * @param az: auth zones structure.
574 * @param env: module env of the worker that is handling the notify. it will
575 * pick up the task probe (or transfer), unless already in progress by
577 * @param nm: name of the zone. Uncompressed. from query.
578 * @param nmlen: length of name.
579 * @param dclass: class of zone.
580 * @param addr: source address of notify
581 * @param addrlen: length of addr.
582 * @param has_serial: if true, the notify has a serial attached.
583 * @param serial: the serial number, if has_serial is true.
584 * @param refused: is set to true on failure to note refused access.
585 * @return fail on failures (refused is false) and when access is
586 * denied (refused is true). True when processed.
588 int auth_zones_notify(struct auth_zones* az, struct module_env* env,
589 uint8_t* nm, size_t nmlen, uint16_t dclass,
590 struct sockaddr_storage* addr, socklen_t addrlen, int has_serial,
591 uint32_t serial, int* refused);
593 /** process notify packet and read serial number from SOA.
594 * returns 0 if no soa record in the notify */
595 int auth_zone_parse_notify_serial(struct sldns_buffer* pkt, uint32_t *serial);
597 /** for the zone and if not already going, starts the probe sequence.
598 * false if zone cannot be found. This is like a notify arrived and was
599 * accepted for that zone. */
600 int auth_zones_startprobesequence(struct auth_zones* az,
601 struct module_env* env, uint8_t* nm, size_t nmlen, uint16_t dclass);
603 /** read auth zone from zonefile. caller must lock zone. false on failure */
604 int auth_zone_read_zonefile(struct auth_zone* z, struct config_file* cfg);
606 /** find serial number of zone or false if none (no SOA record) */
607 int auth_zone_get_serial(struct auth_zone* z, uint32_t* serial);
609 /** compare auth_zones for sorted rbtree */
610 int auth_zone_cmp(const void* z1, const void* z2);
612 /** compare auth_data for sorted rbtree */
613 int auth_data_cmp(const void* z1, const void* z2);
615 /** compare auth_xfer for sorted rbtree */
616 int auth_xfer_cmp(const void* z1, const void* z2);
618 /** Create auth_xfer structure.
619 * Caller must have wrlock on az. Returns locked xfer zone.
620 * @param az: zones structure.
621 * @param z: zone with name and class
622 * @return xfer zone or NULL
624 struct auth_xfer* auth_xfer_create(struct auth_zones* az, struct auth_zone* z);
627 * Set masters in auth xfer structure from config.
628 * @param list: pointer to start of list. The malloced list is returned here.
629 * @param c: the config items to copy over.
630 * @param with_http: if true, http urls are also included, before the masters.
631 * @return false on failure.
633 int xfer_set_masters(struct auth_master** list, struct config_auth* c,
636 /** xfer nextprobe timeout callback, this is part of task_nextprobe */
637 void auth_xfer_timer(void* arg);
639 /** callback for commpoint udp replies to task_probe */
640 int auth_xfer_probe_udp_callback(struct comm_point* c, void* arg, int err,
641 struct comm_reply* repinfo);
642 /** callback for task_transfer tcp connections */
643 int auth_xfer_transfer_tcp_callback(struct comm_point* c, void* arg, int err,
644 struct comm_reply* repinfo);
645 /** callback for task_transfer http connections */
646 int auth_xfer_transfer_http_callback(struct comm_point* c, void* arg, int err,
647 struct comm_reply* repinfo);
648 /** xfer probe timeout callback, part of task_probe */
649 void auth_xfer_probe_timer_callback(void* arg);
650 /** mesh callback for task_probe on lookup of host names */
651 void auth_xfer_probe_lookup_callback(void* arg, int rcode,
652 struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,
653 int was_ratelimited);
654 /** mesh callback for task_transfer on lookup of host names */
655 void auth_xfer_transfer_lookup_callback(void* arg, int rcode,
656 struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,
657 int was_ratelimited);
660 * Compares two 32-bit serial numbers as defined in RFC1982. Returns
661 * <0 if a < b, 0 if a == b, and >0 if a > b. The result is undefined
662 * if a != b but neither is greater or smaller (see RFC1982 section
665 int compare_serial(uint32_t a, uint32_t b);
667 #endif /* SERVICES_AUTHZONE_H */