2 * unbound.h - unbound validating resolver public API
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39 * This file contains functions to resolve DNS queries and
40 * validate the answers. Synchronously and asynchronously.
42 * Several ways to use this interface from an application wishing
43 * to perform (validated) DNS lookups.
46 * ctx = ub_ctx_create();
47 * err = ub_ctx_add_ta(ctx, "...");
48 * err = ub_ctx_add_ta(ctx, "...");
50 * ... call ub_ctx_delete(ctx); when you want to stop.
52 * Application not threaded. Blocking.
53 * int err = ub_resolve(ctx, "www.example.com", ...
54 * if(err) fprintf(stderr, "lookup error: %s\n", ub_strerror(err));
57 * Application not threaded. Non-blocking ('asynchronous').
58 * err = ub_resolve_async(ctx, "www.example.com", ... my_callback);
59 * ... application resumes processing ...
60 * ... and when either ub_poll(ctx) is true
61 * ... or when the file descriptor ub_fd(ctx) is readable,
62 * ... or whenever, the app calls ...
64 * ... if no result is ready, the app resumes processing above,
65 * ... or process() calls my_callback() with results.
67 * ... if the application has nothing more to do, wait for answer
70 * Application threaded. Blocking.
71 * Blocking, same as above. The current thread does the work.
72 * Multiple threads can use the *same context*, each does work and uses
73 * shared cache data from the context.
75 * Application threaded. Non-blocking ('asynchronous').
76 * ... setup threaded-asynchronous config option
77 * err = ub_ctx_async(ctx, 1);
78 * ... same as async for non-threaded
79 * ... the callbacks are called in the thread that calls process(ctx)
81 * Openssl needs to have locking in place, and the application must set
82 * it up, because a mere library cannot do this, use the calls
83 * CRYPTO_set_id_callback and CRYPTO_set_locking_callback.
85 * If no threading is compiled in, the above async example uses fork(2) to
86 * create a process to perform the work. The forked process exits when the
87 * calling process exits, or ctx_delete() is called.
88 * Otherwise, for asynchronous with threading, a worker thread is created.
90 * The blocking calls use shared ctx-cache when threaded. Thus
91 * ub_resolve() and ub_resolve_async() && ub_wait() are
92 * not the same. The first makes the current thread do the work, setting
93 * up buffers, etc, to perform the work (but using shared cache data).
94 * The second calls another worker thread (or process) to perform the work.
95 * And no buffers need to be set up, but a context-switch happens.
104 /** the version of this header file */
105 #define UNBOUND_VERSION_MAJOR @UNBOUND_VERSION_MAJOR@
106 #define UNBOUND_VERSION_MINOR @UNBOUND_VERSION_MINOR@
107 #define UNBOUND_VERSION_MICRO @UNBOUND_VERSION_MICRO@
110 * The validation context is created to hold the resolver status,
111 * validation keys and a small cache (containing messages, rrsets,
112 * roundtrip times, trusted keys, lameness information).
114 * Its contents are internally defined.
119 * The validation and resolution results.
120 * Allocated by the resolver, and need to be freed by the application
121 * with ub_resolve_free().
124 /** The original question, name text string. */
126 /** the type asked for */
128 /** the class asked for */
132 * a list of network order DNS rdata items, terminated with a
133 * NULL pointer, so that data[0] is the first result entry,
134 * data[1] the second, and the last entry is NULL.
135 * If there was no data, data[0] is NULL.
139 /** the length in bytes of the data items, len[i] for data[i] */
143 * canonical name for the result (the final cname).
144 * zero terminated string.
145 * May be NULL if no canonical name exists.
150 * DNS RCODE for the result. May contain additional error code if
151 * there was no data due to an error. 0 (NOERROR) if okay.
156 * The DNS answer packet. Network formatted. Can contain DNSSEC types.
159 /** length of the answer packet in octets. */
163 * If there is any data, this is true.
164 * If false, there was no data (nxdomain may be true, rcode can be set).
169 * If there was no data, and the domain did not exist, this is true.
170 * If it is false, and there was no data, then the domain name
171 * is purported to exist, but the requested data type is not available.
176 * True, if the result is validated securely.
177 * False, if validation failed or domain queried has no security info.
179 * It is possible to get a result with no data (havedata is false),
180 * and secure is true. This means that the non-existence of the data
181 * was cryptographically proven (with signatures).
186 * If the result was not secure (secure==0), and this result is due
187 * to a security failure, bogus is true.
188 * This means the data has been actively tampered with, signatures
189 * failed, expected signatures were not present, timestamps on
190 * signatures were out of date and so on.
192 * If !secure and !bogus, this can happen if the data is not secure
193 * because security is disabled for that domain name.
194 * This means the data is from a domain where data is not signed.
199 * If the result is bogus this contains a string (zero terminated)
200 * that describes the failure. There may be other errors as well
201 * as the one described, the description may not be perfectly accurate.
202 * Is NULL if the result is not bogus.
207 * If the query or one of its subqueries was ratelimited. Useful if
208 * ratelimiting is enabled and answer to the client is SERVFAIL as a
214 * TTL for the result, in seconds. If the security is bogus, then
215 * you also cannot trust this value.
221 * Callback for results of async queries.
222 * The readable function definition looks like:
223 * void my_callback(void* my_arg, int err, struct ub_result* result);
225 * void* my_arg: your pointer to a (struct of) data of your choice,
227 * int err: if 0 all is OK, otherwise an error occurred and no results
229 * struct result: pointer to more detailed result structure.
230 * This structure is allocated on the heap and needs to be
231 * freed with ub_resolve_free(result);
233 typedef void (*ub_callback_type)(void*, int, struct ub_result*);
236 * The error constants
241 /** socket operation. Set to -1, so that if an error from _fd() is
242 * passed (-1) it gives a socket error. */
248 /** DNS service failed */
252 /** cfg change after finalize() */
254 /** initialization failed (bad settings) */
256 /** error in pipe communication with async bg worker */
258 /** error reading from file (resolv.conf) */
260 /** error async_id does not exist or result already been delivered */
265 * Create a resolving and validation context.
266 * The information from /etc/resolv.conf and /etc/hosts is not utilised by
267 * default. Use ub_ctx_resolvconf and ub_ctx_hosts to read them.
268 * @return a new context. default initialisation.
269 * returns NULL on error.
271 struct ub_ctx* ub_ctx_create(void);
274 * Destroy a validation context and free all its resources.
275 * Outstanding async queries are killed and callbacks are not called for them.
276 * @param ctx: context to delete.
278 void ub_ctx_delete(struct ub_ctx* ctx);
281 * Set an option for the context.
282 * @param ctx: context.
283 * @param opt: option name from the unbound.conf config file format.
284 * (not all settings applicable). The name includes the trailing ':'
285 * for example ub_ctx_set_option(ctx, "logfile:", "mylog.txt");
286 * This is a power-users interface that lets you specify all sorts
288 * For some specific options, such as adding trust anchors, special
290 * @param val: value of the option.
291 * @return: 0 if OK, else error.
293 int ub_ctx_set_option(struct ub_ctx* ctx, const char* opt, const char* val);
296 * Get an option from the context.
297 * @param ctx: context.
298 * @param opt: option name from the unbound.conf config file format.
299 * (not all settings applicable). The name excludes the trailing ':'
300 * for example ub_ctx_get_option(ctx, "logfile", &result);
301 * This is a power-users interface that lets you specify all sorts
303 * @param str: the string is malloced and returned here. NULL on error.
304 * The caller must free() the string. In cases with multiple
305 * entries (auto-trust-anchor-file), a newline delimited list is
306 * returned in the string.
307 * @return 0 if OK else an error code (malloc failure, syntax error).
309 int ub_ctx_get_option(struct ub_ctx* ctx, const char* opt, char** str);
312 * setup configuration for the given context.
313 * @param ctx: context.
314 * @param fname: unbound config file (not all settings applicable).
315 * This is a power-users interface that lets you specify all sorts
317 * For some specific options, such as adding trust anchors, special
319 * @return: 0 if OK, else error.
321 int ub_ctx_config(struct ub_ctx* ctx, const char* fname);
324 * Set machine to forward DNS queries to, the caching resolver to use.
325 * IP4 or IP6 address. Forwards all DNS requests to that machine, which
326 * is expected to run a recursive resolver. If the proxy is not
327 * DNSSEC-capable, validation may fail. Can be called several times, in
328 * that case the addresses are used as backup servers.
330 * To read the list of nameservers from /etc/resolv.conf (from DHCP or so),
331 * use the call ub_ctx_resolvconf.
333 * @param ctx: context.
334 * At this time it is only possible to set configuration before the
335 * first resolve is done.
336 * @param addr: address, IP4 or IP6 in string format.
337 * If the addr is NULL, forwarding is disabled.
338 * @return 0 if OK, else error.
340 int ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr);
343 * Use DNS over TLS to send queries to machines set with ub_ctx_set_fwd().
345 * @param ctx: context.
346 * At this time it is only possible to set configuration before the
347 * first resolve is done.
348 * @param tls: enable or disable DNS over TLS
349 * @return 0 if OK, else error.
351 int ub_ctx_set_tls(struct ub_ctx* ctx, int tls);
354 * Add a stub zone, with given address to send to. This is for custom
355 * root hints or pointing to a local authoritative dns server.
356 * For dns resolvers and the 'DHCP DNS' ip address, use ub_ctx_set_fwd.
357 * This is similar to a stub-zone entry in unbound.conf.
359 * @param ctx: context.
360 * It is only possible to set configuration before the
361 * first resolve is done.
362 * @param zone: name of the zone, string.
363 * @param addr: address, IP4 or IP6 in string format.
364 * The addr is added to the list of stub-addresses if the entry exists.
365 * If the addr is NULL the stub entry is removed.
366 * @param isprime: set to true to set stub-prime to yes for the stub.
367 * For local authoritative servers, people usually set it to false,
368 * For root hints it should be set to true.
369 * @return 0 if OK, else error.
371 int ub_ctx_set_stub(struct ub_ctx* ctx, const char* zone, const char* addr,
375 * Read list of nameservers to use from the filename given.
376 * Usually "/etc/resolv.conf". Uses those nameservers as caching proxies.
377 * If they do not support DNSSEC, validation may fail.
379 * Only nameservers are picked up, the searchdomain, ndots and other
380 * settings from resolv.conf(5) are ignored.
382 * @param ctx: context.
383 * At this time it is only possible to set configuration before the
384 * first resolve is done.
385 * @param fname: file name string. If NULL "/etc/resolv.conf" is used.
386 * @return 0 if OK, else error.
388 int ub_ctx_resolvconf(struct ub_ctx* ctx, const char* fname);
391 * Read list of hosts from the filename given.
392 * Usually "/etc/hosts".
393 * These addresses are not flagged as DNSSEC secure when queried for.
395 * @param ctx: context.
396 * At this time it is only possible to set configuration before the
397 * first resolve is done.
398 * @param fname: file name string. If NULL "/etc/hosts" is used.
399 * @return 0 if OK, else error.
401 int ub_ctx_hosts(struct ub_ctx* ctx, const char* fname);
404 * Add a trust anchor to the given context.
405 * The trust anchor is a string, on one line, that holds a valid DNSKEY or
407 * @param ctx: context.
408 * At this time it is only possible to add trusted keys before the
409 * first resolve is done.
410 * @param ta: string, with zone-format RR on one line.
411 * [domainname] [TTL optional] [type] [class optional] [rdata contents]
412 * @return 0 if OK, else error.
414 int ub_ctx_add_ta(struct ub_ctx* ctx, const char* ta);
417 * Add trust anchors to the given context.
418 * Pass name of a file with DS and DNSKEY records (like from dig or drill).
419 * @param ctx: context.
420 * At this time it is only possible to add trusted keys before the
421 * first resolve is done.
422 * @param fname: filename of file with keyfile with trust anchors.
423 * @return 0 if OK, else error.
425 int ub_ctx_add_ta_file(struct ub_ctx* ctx, const char* fname);
428 * Add trust anchor to the given context that is tracked with RFC5011
429 * automated trust anchor maintenance. The file is written to when the
430 * trust anchor is changed.
431 * Pass the name of a file that was output from eg. unbound-anchor,
432 * or you can start it by providing a trusted DNSKEY or DS record on one
434 * @param ctx: context.
435 * At this time it is only possible to add trusted keys before the
436 * first resolve is done.
437 * @param fname: filename of file with trust anchor.
438 * @return 0 if OK, else error.
440 int ub_ctx_add_ta_autr(struct ub_ctx* ctx, const char* fname);
443 * Add trust anchors to the given context.
444 * Pass the name of a bind-style config file with trusted-keys{}.
445 * @param ctx: context.
446 * At this time it is only possible to add trusted keys before the
447 * first resolve is done.
448 * @param fname: filename of file with bind-style config entries with trust
450 * @return 0 if OK, else error.
452 int ub_ctx_trustedkeys(struct ub_ctx* ctx, const char* fname);
455 * Set debug output (and error output) to the specified stream.
456 * Pass NULL to disable. Default is stderr.
457 * @param ctx: context.
458 * @param out: FILE* out file stream to log to.
459 * Type void* to avoid stdio dependency of this header file.
460 * @return 0 if OK, else error.
462 int ub_ctx_debugout(struct ub_ctx* ctx, void* out);
465 * Set debug verbosity for the context
466 * Output is directed to stderr.
467 * @param ctx: context.
468 * @param d: debug level, 0 is off, 1 is very minimal, 2 is detailed,
470 * @return 0 if OK, else error.
472 int ub_ctx_debuglevel(struct ub_ctx* ctx, int d);
475 * Set a context behaviour for asynchronous action.
476 * @param ctx: context.
477 * @param dothread: if true, enables threading and a call to resolve_async()
478 * creates a thread to handle work in the background.
479 * If false, a process is forked to handle work in the background.
480 * Changes to this setting after async() calls have been made have
481 * no effect (delete and re-create the context to change).
482 * @return 0 if OK, else error.
484 int ub_ctx_async(struct ub_ctx* ctx, int dothread);
487 * Poll a context to see if it has any new results
488 * Do not poll in a loop, instead extract the fd below to poll for readiness,
489 * and then check, or wait using the wait routine.
490 * @param ctx: context.
491 * @return: 0 if nothing to read, or nonzero if a result is available.
492 * If nonzero, call ctx_process() to do callbacks.
494 int ub_poll(struct ub_ctx* ctx);
497 * Wait for a context to finish with results. Calls ub_process() after
498 * the wait for you. After the wait, there are no more outstanding
499 * asynchronous queries.
500 * @param ctx: context.
501 * @return: 0 if OK, else error.
503 int ub_wait(struct ub_ctx* ctx);
506 * Get file descriptor. Wait for it to become readable, at this point
507 * answers are returned from the asynchronous validating resolver.
508 * Then call the ub_process to continue processing.
509 * This routine works immediately after context creation, the fd
511 * @param ctx: context.
512 * @return: -1 on error, or file descriptor to use select(2) with.
514 int ub_fd(struct ub_ctx* ctx);
517 * Call this routine to continue processing results from the validating
518 * resolver (when the fd becomes readable).
519 * Will perform necessary callbacks.
520 * @param ctx: context
521 * @return: 0 if OK, else error.
523 int ub_process(struct ub_ctx* ctx);
526 * Perform resolution and validation of the target name.
527 * @param ctx: context.
528 * The context is finalized, and can no longer accept config changes.
529 * @param name: domain name in text format (a zero terminated text string).
530 * @param rrtype: type of RR in host order, 1 is A (address).
531 * @param rrclass: class of RR in host order, 1 is IN (for internet).
532 * @param result: the result data is returned in a newly allocated result
533 * structure. May be NULL on return, return value is set to an error
534 * in that case (out of memory).
535 * @return 0 if OK, else error.
537 int ub_resolve(struct ub_ctx* ctx, const char* name, int rrtype,
538 int rrclass, struct ub_result** result);
541 * Perform resolution and validation of the target name.
542 * Asynchronous, after a while, the callback will be called with your
543 * data and the result.
544 * @param ctx: context.
545 * If no thread or process has been created yet to perform the
546 * work in the background, it is created now.
547 * The context is finalized, and can no longer accept config changes.
548 * @param name: domain name in text format (a string).
549 * @param rrtype: type of RR in host order, 1 is A.
550 * @param rrclass: class of RR in host order, 1 is IN (for internet).
551 * @param mydata: this data is your own data (you can pass NULL),
552 * and is passed on to the callback function.
553 * @param callback: this is called on completion of the resolution.
555 * void callback(void* mydata, int err, struct ub_result* result)
556 * with mydata: the same as passed here, you may pass NULL,
557 * with err: is 0 when a result has been found.
558 * with result: a newly allocated result structure.
559 * The result may be NULL, in that case err is set.
561 * If an error happens during processing, your callback will be called
562 * with error set to a nonzero value (and result==NULL).
563 * @param async_id: if you pass a non-NULL value, an identifier number is
564 * returned for the query as it is in progress. It can be used to
566 * @return 0 if OK, else error.
568 int ub_resolve_async(struct ub_ctx* ctx, const char* name, int rrtype,
569 int rrclass, void* mydata, ub_callback_type callback, int* async_id);
572 * Cancel an async query in progress.
573 * Its callback will not be called.
575 * @param ctx: context.
576 * @param async_id: which query to cancel.
577 * @return 0 if OK, else error.
578 * This routine can return an error if the async_id passed does not exist
579 * or has already been delivered. If another thread is processing results
580 * at the same time, the result may be delivered at the same time and the
581 * cancel fails with an error. Also the cancel can fail due to a system
582 * error, no memory or socket failures.
584 int ub_cancel(struct ub_ctx* ctx, int async_id);
587 * Free storage associated with a result structure.
588 * @param result: to free
590 void ub_resolve_free(struct ub_result* result);
593 * Convert error value to a human readable string.
594 * @param err: error code from one of the libunbound functions.
595 * The error codes are from the type enum ub_ctx_err.
596 * @return pointer to constant text string, zero terminated.
598 const char* ub_strerror(int err);
601 * Debug routine. Print the local zone information to debug output.
602 * @param ctx: context. Is finalized by the routine.
603 * @return 0 if OK, else error.
605 int ub_ctx_print_local_zones(struct ub_ctx* ctx);
608 * Add a new zone with the zonetype to the local authority info of the
610 * @param ctx: context. Is finalized by the routine.
611 * @param zone_name: name of the zone in text, "example.com"
612 * If it already exists, the type is updated.
613 * @param zone_type: type of the zone (like for unbound.conf) in text.
614 * @return 0 if OK, else error.
616 int ub_ctx_zone_add(struct ub_ctx* ctx, const char *zone_name,
617 const char *zone_type);
620 * Remove zone from local authority info of the library.
621 * @param ctx: context. Is finalized by the routine.
622 * @param zone_name: name of the zone in text, "example.com"
623 * If it does not exist, nothing happens.
624 * @return 0 if OK, else error.
626 int ub_ctx_zone_remove(struct ub_ctx* ctx, const char *zone_name);
629 * Add localdata to the library local authority info.
630 * Similar to local-data config statement.
631 * @param ctx: context. Is finalized by the routine.
632 * @param data: the resource record in text format, for example
633 * "www.example.com IN A 127.0.0.1"
634 * @return 0 if OK, else error.
636 int ub_ctx_data_add(struct ub_ctx* ctx, const char *data);
639 * Remove localdata from the library local authority info.
640 * @param ctx: context. Is finalized by the routine.
641 * @param data: the name to delete all data from, like "www.example.com".
642 * @return 0 if OK, else error.
644 int ub_ctx_data_remove(struct ub_ctx* ctx, const char *data);
647 * Get a version string from the libunbound implementation.
648 * @return a static constant string with the version number.
650 const char* ub_version(void);
653 * Some global statistics that are not in struct stats_info,
654 * this struct is shared on a shm segment (shm-key in unbound.conf)
656 struct ub_shm_stat_info {
660 long long now_sec, now_usec;
661 long long up_sec, up_usec;
662 long long elapsed_sec, elapsed_usec;
673 long long dnscrypt_shared_secret;
674 long long dnscrypt_nonce;
679 /** number of qtype that is stored for in array */
680 #define UB_STATS_QTYPE_NUM 256
681 /** number of qclass that is stored for in array */
682 #define UB_STATS_QCLASS_NUM 256
683 /** number of rcodes in stats */
684 #define UB_STATS_RCODE_NUM 16
685 /** number of opcodes in stats */
686 #define UB_STATS_OPCODE_NUM 16
687 /** number of histogram buckets */
688 #define UB_STATS_BUCKET_NUM 40
689 /** number of RPZ actions */
690 #define UB_STATS_RPZ_ACTION_NUM 10
692 /** per worker statistics. */
693 struct ub_server_stats {
694 /** number of queries from clients received. */
695 long long num_queries;
696 /** number of queries that have been dropped/ratelimited by ip. */
697 long long num_queries_ip_ratelimited;
698 /** number of queries with a valid DNS Cookie. */
699 long long num_queries_cookie_valid;
700 /** number of queries with only the client part of the DNS Cookie. */
701 long long num_queries_cookie_client;
702 /** number of queries with invalid DNS Cookie. */
703 long long num_queries_cookie_invalid;
704 /** number of queries that had a cache-miss. */
705 long long num_queries_missed_cache;
706 /** number of prefetch queries - cachehits with prefetch */
707 long long num_queries_prefetch;
708 /** number of queries which are too late to process */
709 long long num_queries_timed_out;
710 /** the longest wait time in the queue */
711 long long max_query_time_us;
713 * Sum of the querylistsize of the worker for
714 * every query that missed cache. To calculate average.
716 long long sum_query_list_size;
717 /** max value of query list size reached. */
718 long long max_query_list_size;
720 /** Extended stats below (bool) */
724 long long qtype[UB_STATS_QTYPE_NUM];
725 /** bigger qtype values not in array */
728 long long qclass[UB_STATS_QCLASS_NUM];
729 /** bigger qclass values not in array */
730 long long qclass_big;
732 long long qopcode[UB_STATS_OPCODE_NUM];
733 /** number of queries over TCP */
735 /** number of outgoing queries over TCP */
736 long long qtcp_outgoing;
737 /** number of outgoing queries over UDP */
738 long long qudp_outgoing;
739 /** number of queries over (DNS over) TLS */
741 /** number of queries over (DNS over) HTTPS */
743 /** number of queries over IPv6 */
745 /** number of queries with QR bit */
747 /** number of queries with AA bit */
749 /** number of queries with TC bit */
751 /** number of queries with RD bit */
753 /** number of queries with RA bit */
755 /** number of queries with Z bit */
757 /** number of queries with AD bit */
759 /** number of queries with CD bit */
761 /** number of queries with EDNS OPT record */
763 /** number of queries with EDNS with DO flag */
766 long long ans_rcode[UB_STATS_RCODE_NUM];
767 /** answers with pseudo rcode 'nodata' */
768 long long ans_rcode_nodata;
769 /** answers that were secure (AD) */
770 long long ans_secure;
771 /** answers that were bogus (withheld as SERVFAIL) */
773 /** rrsets marked bogus by validator */
774 long long rrset_bogus;
775 /** number of queries that have been ratelimited by domain recursion. */
776 long long queries_ratelimited;
777 /** unwanted traffic received on server-facing ports */
778 long long unwanted_replies;
779 /** unwanted traffic received on client-facing ports */
780 long long unwanted_queries;
781 /** usage of tcp accept list */
782 long long tcp_accept_usage;
783 /** expired answers served from cache */
784 long long ans_expired;
785 /** histogram data exported to array
786 * if the array is the same size, no data is lost, and
787 * if all histograms are same size (is so by default) then
788 * adding up works well. */
789 long long hist[UB_STATS_BUCKET_NUM];
791 /** number of message cache entries */
792 long long msg_cache_count;
793 /** number of rrset cache entries */
794 long long rrset_cache_count;
795 /** number of infra cache entries */
796 long long infra_cache_count;
797 /** number of key cache entries */
798 long long key_cache_count;
800 /** maximum number of collisions in the msg cache */
801 long long msg_cache_max_collisions;
802 /** maximum number of collisions in the rrset cache */
803 long long rrset_cache_max_collisions;
805 /** number of queries that used dnscrypt */
806 long long num_query_dnscrypt_crypted;
807 /** number of queries that queried dnscrypt certificates */
808 long long num_query_dnscrypt_cert;
809 /** number of queries in clear text and not asking for the certificates */
810 long long num_query_dnscrypt_cleartext;
811 /** number of malformed encrypted queries */
812 long long num_query_dnscrypt_crypted_malformed;
813 /** number of queries which did not have a shared secret in cache */
814 long long num_query_dnscrypt_secret_missed_cache;
815 /** number of dnscrypt shared secret cache entries */
816 long long shared_secret_cache_count;
817 /** number of queries which are replays */
818 long long num_query_dnscrypt_replay;
819 /** number of dnscrypt nonces cache entries */
820 long long nonce_cache_count;
821 /** number of queries for unbound's auth_zones, upstream query */
822 long long num_query_authzone_up;
823 /** number of queries for unbound's auth_zones, downstream answers */
824 long long num_query_authzone_down;
825 /** number of times neg cache records were used to generate NOERROR
827 long long num_neg_cache_noerror;
828 /** number of times neg cache records were used to generate NXDOMAIN
830 long long num_neg_cache_nxdomain;
831 /** number of queries answered from edns-subnet specific data */
832 long long num_query_subnet;
833 /** number of queries answered from edns-subnet specific data, and
834 * the answer was from the edns-subnet cache. */
835 long long num_query_subnet_cache;
836 /** number of queries served from cachedb */
837 long long num_query_cachedb;
838 /** number of bytes in the stream wait buffers */
839 long long mem_stream_wait;
840 /** number of bytes in the HTTP2 query buffers */
841 long long mem_http2_query_buffer;
842 /** number of bytes in the HTTP2 response buffers */
843 long long mem_http2_response_buffer;
844 /** number of TLS connection resume */
845 long long qtls_resume;
846 /** RPZ action stats */
847 long long rpz_action[UB_STATS_RPZ_ACTION_NUM];
851 * Statistics to send over the control pipe when asked
852 * This struct is made to be memcopied, sent in binary.
853 * shm mapped with (number+1) at num_threads+1, with first as total
855 struct ub_stats_info {
856 /** the thread stats */
857 struct ub_server_stats svr;
859 /** mesh stats: current number of states */
860 long long mesh_num_states;
861 /** mesh stats: current number of reply (user) states */
862 long long mesh_num_reply_states;
863 /** mesh stats: number of reply states overwritten with a new one */
864 long long mesh_jostled;
865 /** mesh stats: number of incoming queries dropped */
866 long long mesh_dropped;
867 /** mesh stats: replies sent */
868 long long mesh_replies_sent;
869 /** mesh stats: sum of waiting times for the replies */
870 long long mesh_replies_sum_wait_sec, mesh_replies_sum_wait_usec;
871 /** mesh stats: median of waiting times for replies (in sec) */
872 double mesh_time_median;
879 #endif /* UB_UNBOUND_H */