2 * services/localzone.h - local zones authority service.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
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39 * This file contains functions to enable local zone authority service.
42 #ifndef SERVICES_LOCALZONE_H
43 #define SERVICES_LOCALZONE_H
44 #include "util/rbtree.h"
45 #include "util/locks.h"
46 #include "util/storage/dnstree.h"
47 #include "util/module.h"
48 #include "services/view.h"
49 struct packed_rrset_data;
50 struct ub_packed_rrset_key;
57 struct config_strlist;
61 * This type determines processing for queries that did not match
62 * local-data directly.
65 /** unset type, used for unset tag_action elements */
69 /** answer with error */
71 /** answer nxdomain or nodata */
73 /** resolve normally */
74 local_zone_transparent,
75 /** do not block types at localdata names */
76 local_zone_typetransparent,
77 /** answer with data at zone apex */
79 /** remove default AS112 blocking contents for zone
80 * nodefault is used in config not during service. */
82 /** log client address, but no block (transparent) */
84 /** log client address, and block (drop) */
85 local_zone_inform_deny,
86 /** resolve normally, even when there is local data */
87 local_zone_always_transparent,
88 /** answer with error, even when there is local data */
89 local_zone_always_refuse,
90 /** answer with nxdomain, even when there is local data */
91 local_zone_always_nxdomain,
92 /** answer not from the view, but global or no-answer */
97 * Authoritative local zones storage, shared.
100 /** lock on the localzone tree */
102 /** rbtree of struct local_zone */
107 * Local zone. A locally served authoritative zone.
110 /** rbtree node, key is name and class */
112 /** parent zone, if any. */
113 struct local_zone* parent;
115 /** zone name, in uncompressed wireformat */
117 /** length of zone name */
119 /** number of labels in zone name */
121 /** the class of this zone.
122 * uses 'dclass' to not conflict with c++ keyword class. */
125 /** lock on the data in the structure
126 * For the node, parent, name, namelen, namelabs, dclass, you
127 * need to also hold the zones_tree lock to change them (or to
128 * delete this zone) */
131 /** how to process zone */
132 enum localzone_type type;
135 /** length of the taglist (in bytes) */
137 /** netblock addr_tree with struct local_zone_override information
138 * or NULL if there are no override elements */
139 struct rbtree_type* override_tree;
141 /** in this region the zone's data is allocated.
142 * the struct local_zone itself is malloced. */
143 struct regional* region;
144 /** local data for this zone
145 * rbtree of struct local_data */
147 /** if data contains zone apex SOA data, this is a ptr to it. */
148 struct ub_packed_rrset_key* soa;
152 * Local data. One domain name, and the RRs to go with it.
155 /** rbtree node, key is name only */
159 /** length of name */
161 /** number of labels in name */
163 /** the data rrsets, with different types, linked list.
164 * If this list is NULL, the node is an empty non-terminal. */
165 struct local_rrset* rrsets;
173 struct local_rrset* next;
174 /** RRset data item */
175 struct ub_packed_rrset_key* rrset;
179 * Local zone override information
181 struct local_zone_override {
182 /** node in addrtree */
183 struct addr_tree_node node;
184 /** override for local zone type */
185 enum localzone_type type;
189 * Create local zones storage
190 * @return new struct or NULL on error.
192 struct local_zones* local_zones_create(void);
195 * Delete local zones storage
196 * @param zones: to delete.
198 void local_zones_delete(struct local_zones* zones);
201 * Apply config settings; setup the local authoritative data.
202 * Takes care of locking.
203 * @param zones: is set up.
204 * @param cfg: config data.
205 * @return false on error.
207 int local_zones_apply_cfg(struct local_zones* zones, struct config_file* cfg);
210 * Compare two local_zone entries in rbtree. Sort hierarchical but not
214 * @return: -1, 0, +1 comparison value.
216 int local_zone_cmp(const void* z1, const void* z2);
219 * Compare two local_data entries in rbtree. Sort canonical.
222 * @return: -1, 0, +1 comparison value.
224 int local_data_cmp(const void* d1, const void* d2);
228 * @param z: to delete.
230 void local_zone_delete(struct local_zone* z);
233 * Lookup zone that contains the given name, class and taglist.
234 * User must lock the tree or result zone.
235 * @param zones: the zones tree
236 * @param name: dname to lookup
237 * @param len: length of name.
238 * @param labs: labelcount of name.
239 * @param dclass: class to lookup.
240 * @param dtype: type to lookup, if type DS a zone higher is used for zonecuts.
241 * @param taglist: taglist to lookup.
242 * @param taglen: lenth of taglist.
243 * @param ignoretags: lookup zone by name and class, regardless the
245 * @return closest local_zone or NULL if no covering zone is found.
247 struct local_zone* local_zones_tags_lookup(struct local_zones* zones,
248 uint8_t* name, size_t len, int labs, uint16_t dclass, uint16_t dtype,
249 uint8_t* taglist, size_t taglen, int ignoretags);
252 * Lookup zone that contains the given name, class.
253 * User must lock the tree or result zone.
254 * @param zones: the zones tree
255 * @param name: dname to lookup
256 * @param len: length of name.
257 * @param labs: labelcount of name.
258 * @param dclass: class to lookup.
259 * @param dtype: type of the record, if type DS then a zone higher up is found
260 * pass 0 to just plain find a zone for a name.
261 * @return closest local_zone or NULL if no covering zone is found.
263 struct local_zone* local_zones_lookup(struct local_zones* zones,
264 uint8_t* name, size_t len, int labs, uint16_t dclass, uint16_t dtype);
267 * Debug helper. Print all zones
268 * Takes care of locking.
269 * @param zones: the zones tree
271 void local_zones_print(struct local_zones* zones);
274 * Answer authoritatively for local zones.
275 * Takes care of locking.
276 * @param zones: the stored zones (shared, read only).
277 * @param env: the module environment.
278 * @param qinfo: query info (parsed).
279 * @param edns: edns info (parsed).
280 * @param buf: buffer with query ID and flags, also for reply.
281 * @param temp: temporary storage region.
282 * @param repinfo: source address for checks. may be NULL.
283 * @param taglist: taglist for checks. May be NULL.
284 * @param taglen: length of the taglist.
285 * @param tagactions: local zone actions for tags. May be NULL.
286 * @param tagactionssize: length of the tagactions.
287 * @param tag_datas: array per tag of strlist with rdata strings. or NULL.
288 * @param tag_datas_size: size of tag_datas array.
289 * @param tagname: array of tag name strings (for debug output).
290 * @param num_tags: number of items in tagname array.
291 * @param view: answer using this view. May be NULL.
292 * @return true if answer is in buffer. false if query is not answered
293 * by authority data. If the reply should be dropped altogether, the return
294 * value is true, but the buffer is cleared (empty).
295 * It can also return true if a non-exact alias answer is found. In this
296 * case qinfo->local_alias points to the corresponding alias RRset but the
297 * answer is NOT encoded in buffer. It's the caller's responsibility to
298 * complete the alias chain (if needed) and encode the final set of answer.
299 * Data pointed to by qinfo->local_alias is allocated in 'temp' or refers to
300 * configuration data. So the caller will need to make a deep copy of it
301 * if it needs to keep it beyond the lifetime of 'temp' or a dynamic update
302 * to local zone data.
304 int local_zones_answer(struct local_zones* zones, struct module_env* env,
305 struct query_info* qinfo, struct edns_data* edns, struct sldns_buffer* buf,
306 struct regional* temp, struct comm_reply* repinfo, uint8_t* taglist,
307 size_t taglen, uint8_t* tagactions, size_t tagactionssize,
308 struct config_strlist** tag_datas, size_t tag_datas_size,
309 char** tagname, int num_tags, struct view* view);
312 * Parse the string into localzone type.
314 * @param str: string to parse
315 * @param t: local zone type returned here.
316 * @return 0 on parse error.
318 int local_zone_str2type(const char* str, enum localzone_type* t);
321 * Print localzone type to a string. Pointer to a constant string.
323 * @param t: local zone type.
324 * @return constant string that describes type.
326 const char* local_zone_type2str(enum localzone_type t);
329 * Find zone that with exactly given name, class.
330 * User must lock the tree or result zone.
331 * @param zones: the zones tree
332 * @param name: dname to lookup
333 * @param len: length of name.
334 * @param labs: labelcount of name.
335 * @param dclass: class to lookup.
336 * @return the exact local_zone or NULL.
338 struct local_zone* local_zones_find(struct local_zones* zones,
339 uint8_t* name, size_t len, int labs, uint16_t dclass);
342 * Add a new zone. Caller must hold the zones lock.
343 * Adjusts the other zones as well (parent pointers) after insertion.
344 * The zone must NOT exist (returns NULL and logs error).
345 * @param zones: the zones tree
346 * @param name: dname to add
347 * @param len: length of name.
348 * @param labs: labelcount of name.
349 * @param dclass: class to add.
351 * @return local_zone or NULL on error, caller must printout memory error.
353 struct local_zone* local_zones_add_zone(struct local_zones* zones,
354 uint8_t* name, size_t len, int labs, uint16_t dclass,
355 enum localzone_type tp);
358 * Delete a zone. Caller must hold the zones lock.
359 * Adjusts the other zones as well (parent pointers) after insertion.
360 * @param zones: the zones tree
361 * @param zone: the zone to delete from tree. Also deletes zone from memory.
363 void local_zones_del_zone(struct local_zones* zones, struct local_zone* zone);
366 * Add RR data into the localzone data.
367 * Looks up the zone, if no covering zone, a transparent zone with the
368 * name of the RR is created.
369 * @param zones: the zones tree. Not locked by caller.
370 * @param rr: string with on RR.
371 * @return false on failure.
373 int local_zones_add_RR(struct local_zones* zones, const char* rr);
376 * Remove data from domain name in the tree.
377 * All types are removed. No effect if zone or name does not exist.
378 * @param zones: zones tree.
379 * @param name: dname to remove
380 * @param len: length of name.
381 * @param labs: labelcount of name.
382 * @param dclass: class to remove.
384 void local_zones_del_data(struct local_zones* zones,
385 uint8_t* name, size_t len, int labs, uint16_t dclass);
389 * Form wireformat from text format domain name.
390 * @param str: the domain name in text "www.example.com"
391 * @param res: resulting wireformat is stored here with malloc.
392 * @param len: length of resulting wireformat.
393 * @param labs: number of labels in resulting wireformat.
394 * @return false on error, syntax or memory. Also logged.
396 int parse_dname(const char* str, uint8_t** res, size_t* len, int* labs);
399 * Find local data tag string match for the given type (in qinfo) in the list.
400 * If found, 'r' will be filled with corresponding rrset information.
401 * @param qinfo: contains name, type, and class for the data
402 * @param list: stores local tag data to be searched
403 * @param r: rrset key to be filled for matched data
404 * @param temp: region to allocate rrset in 'r'
405 * @return 1 if a match is found and rrset is built; otherwise 0 including
408 int local_data_find_tag_datas(const struct query_info* qinfo,
409 struct config_strlist* list, struct ub_packed_rrset_key* r,
410 struct regional* temp);
413 * See if two sets of tag lists (in the form of bitmap) have the same tag that
414 * has an action. If so, '*tag' will be set to the found tag index, and the
415 * corresponding action will be returned in the form of local zone type.
416 * Otherwise the passed type (lzt) will be returned as the default action.
417 * Pointers except tagactions must not be NULL.
418 * @param taglist: 1st list of tags
419 * @param taglen: size of taglist in bytes
420 * @param taglist2: 2nd list of tags
421 * @param taglen2: size of taglist2 in bytes
422 * @param tagactions: local data actions for tags. May be NULL.
423 * @param tagactionssize: length of the tagactions.
424 * @param lzt: default action (local zone type) if no tag action is found.
425 * @param tag: see above.
426 * @param tagname: array of tag name strings (for debug output).
427 * @param num_tags: number of items in tagname array.
428 * @return found tag action or the default action.
430 enum localzone_type local_data_find_tag_action(const uint8_t* taglist,
431 size_t taglen, const uint8_t* taglist2, size_t taglen2,
432 const uint8_t* tagactions, size_t tagactionssize,
433 enum localzone_type lzt, int* tag, char* const* tagname, int num_tags);
436 * Enter defaults to local zone.
437 * @param zones: to add defaults to
438 * @param cfg: containing list of zones to exclude from default set.
439 * @return 1 on success; 0 otherwise.
441 int local_zone_enter_defaults(struct local_zones* zones,
442 struct config_file* cfg);
445 * Parses resource record string into wire format, also returning its field values.
446 * @param str: input resource record
447 * @param nm: domain name field
448 * @param type: record type field
449 * @param dclass: record class field
450 * @param ttl: ttl field
451 * @param rr: buffer for the parsed rr in wire format
452 * @param len: buffer length
453 * @param rdata: rdata field
454 * @param rdata_len: rdata field length
455 * @return 1 on success; 0 otherwise.
457 int rrstr_get_rr_content(const char* str, uint8_t** nm, uint16_t* type,
458 uint16_t* dclass, time_t* ttl, uint8_t* rr, size_t len,
459 uint8_t** rdata, size_t* rdata_len);
462 * Insert specified rdata into the specified resource record.
463 * @param region: allocator
464 * @param pd: data portion of the destination resource record
465 * @param rdata: source rdata
466 * @param rdata_len: source rdata length
467 * @param ttl: time to live
468 * @param rrstr: resource record in text form (for logging)
469 * @return 1 on success; 0 otherwise.
471 int rrset_insert_rr(struct regional* region, struct packed_rrset_data* pd,
472 uint8_t* rdata, size_t rdata_len, time_t ttl, const char* rrstr);
475 * Valid response ip actions for the IP-response-driven-action feature;
476 * defined here instead of in the respip module to enable sharing of enum
477 * values with the localzone_type enum.
478 * Note that these values except 'none' are the same as localzone types of
479 * the 'same semantics'. It's intentional as we use these values via
480 * access-control-tags, which can be shared for both response ip actions and
484 /** no respip action */
485 respip_none = local_zone_unset,
487 respip_deny = local_zone_deny,
488 /** redirect as per provided data */
489 respip_redirect = local_zone_redirect,
490 /** log query source and answer query */
491 respip_inform = local_zone_inform,
492 /** log query source and don't answer query */
493 respip_inform_deny = local_zone_inform_deny,
494 /** resolve normally, even when there is response-ip data */
495 respip_always_transparent = local_zone_always_transparent,
496 /** answer with 'refused' response */
497 respip_always_refuse = local_zone_always_refuse,
498 /** answer with 'no such domain' response */
499 respip_always_nxdomain = local_zone_always_nxdomain,
501 /* The rest of the values are only possible as
502 * access-control-tag-action */
504 /** serves response data (if any), else, drops queries. */
505 respip_refuse = local_zone_refuse,
506 /** serves response data, else, nodata answer. */
507 respip_static = local_zone_static,
508 /** gives response data (if any), else nodata answer. */
509 respip_transparent = local_zone_transparent,
510 /** gives response data (if any), else nodata answer. */
511 respip_typetransparent = local_zone_typetransparent,
514 #endif /* SERVICES_LOCALZONE_H */