2 * unbound.h - unbound validating resolver public API
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 * This file contains functions to resolve DNS queries and
40 * validate the answers. Synchonously 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-existance 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 * TTL for the result, in seconds. If the security is bogus, then
208 * you also cannot trust this value.
214 * Callback for results of async queries.
215 * The readable function definition looks like:
216 * void my_callback(void* my_arg, int err, struct ub_result* result);
218 * void* my_arg: your pointer to a (struct of) data of your choice,
220 * int err: if 0 all is OK, otherwise an error occured and no results
222 * struct result: pointer to more detailed result structure.
223 * This structure is allocated on the heap and needs to be
224 * freed with ub_resolve_free(result);
226 typedef void (*ub_callback_type)(void*, int, struct ub_result*);
229 * Create a resolving and validation context.
230 * The information from /etc/resolv.conf and /etc/hosts is not utilised by
231 * default. Use ub_ctx_resolvconf and ub_ctx_hosts to read them.
232 * @return a new context. default initialisation.
233 * returns NULL on error.
235 struct ub_ctx* ub_ctx_create(void);
238 * Destroy a validation context and free all its resources.
239 * Outstanding async queries are killed and callbacks are not called for them.
240 * @param ctx: context to delete.
242 void ub_ctx_delete(struct ub_ctx* ctx);
245 * Set an option for the context.
246 * @param ctx: context.
247 * @param opt: option name from the unbound.conf config file format.
248 * (not all settings applicable). The name includes the trailing ':'
249 * for example ub_ctx_set_option(ctx, "logfile:", "mylog.txt");
250 * This is a power-users interface that lets you specify all sorts
252 * For some specific options, such as adding trust anchors, special
254 * @param val: value of the option.
255 * @return: 0 if OK, else error.
257 int ub_ctx_set_option(struct ub_ctx* ctx, const char* opt, const char* val);
260 * Get an option from the context.
261 * @param ctx: context.
262 * @param opt: option name from the unbound.conf config file format.
263 * (not all settings applicable). The name excludes the trailing ':'
264 * for example ub_ctx_get_option(ctx, "logfile", &result);
265 * This is a power-users interface that lets you specify all sorts
267 * @param str: the string is malloced and returned here. NULL on error.
268 * The caller must free() the string. In cases with multiple
269 * entries (auto-trust-anchor-file), a newline delimited list is
270 * returned in the string.
271 * @return 0 if OK else an error code (malloc failure, syntax error).
273 int ub_ctx_get_option(struct ub_ctx* ctx, const char* opt, char** str);
276 * setup configuration for the given context.
277 * @param ctx: context.
278 * @param fname: unbound config file (not all settings applicable).
279 * This is a power-users interface that lets you specify all sorts
281 * For some specific options, such as adding trust anchors, special
283 * @return: 0 if OK, else error.
285 int ub_ctx_config(struct ub_ctx* ctx, const char* fname);
288 * Set machine to forward DNS queries to, the caching resolver to use.
289 * IP4 or IP6 address. Forwards all DNS requests to that machine, which
290 * is expected to run a recursive resolver. If the proxy is not
291 * DNSSEC-capable, validation may fail. Can be called several times, in
292 * that case the addresses are used as backup servers.
294 * To read the list of nameservers from /etc/resolv.conf (from DHCP or so),
295 * use the call ub_ctx_resolvconf.
297 * @param ctx: context.
298 * At this time it is only possible to set configuration before the
299 * first resolve is done.
300 * @param addr: address, IP4 or IP6 in string format.
301 * If the addr is NULL, forwarding is disabled.
302 * @return 0 if OK, else error.
304 int ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr);
307 * Add a stub zone, with given address to send to. This is for custom
308 * root hints or pointing to a local authoritative dns server.
309 * For dns resolvers and the 'DHCP DNS' ip address, use ub_ctx_set_fwd.
310 * This is similar to a stub-zone entry in unbound.conf.
312 * @param ctx: context.
313 * It is only possible to set configuration before the
314 * first resolve is done.
315 * @param zone: name of the zone, string.
316 * @param addr: address, IP4 or IP6 in string format.
317 * The addr is added to the list of stub-addresses if the entry exists.
318 * If the addr is NULL the stub entry is removed.
319 * @param isprime: set to true to set stub-prime to yes for the stub.
320 * For local authoritative servers, people usually set it to false,
321 * For root hints it should be set to true.
322 * @return 0 if OK, else error.
324 int ub_ctx_set_stub(struct ub_ctx* ctx, const char* zone, const char* addr,
328 * Read list of nameservers to use from the filename given.
329 * Usually "/etc/resolv.conf". Uses those nameservers as caching proxies.
330 * If they do not support DNSSEC, validation may fail.
332 * Only nameservers are picked up, the searchdomain, ndots and other
333 * settings from resolv.conf(5) are ignored.
335 * @param ctx: context.
336 * At this time it is only possible to set configuration before the
337 * first resolve is done.
338 * @param fname: file name string. If NULL "/etc/resolv.conf" is used.
339 * @return 0 if OK, else error.
341 int ub_ctx_resolvconf(struct ub_ctx* ctx, const char* fname);
344 * Read list of hosts from the filename given.
345 * Usually "/etc/hosts".
346 * These addresses are not flagged as DNSSEC secure when queried for.
348 * @param ctx: context.
349 * At this time it is only possible to set configuration before the
350 * first resolve is done.
351 * @param fname: file name string. If NULL "/etc/hosts" is used.
352 * @return 0 if OK, else error.
354 int ub_ctx_hosts(struct ub_ctx* ctx, const char* fname);
357 * Add a trust anchor to the given context.
358 * The trust anchor is a string, on one line, that holds a valid DNSKEY or
360 * @param ctx: context.
361 * At this time it is only possible to add trusted keys before the
362 * first resolve is done.
363 * @param ta: string, with zone-format RR on one line.
364 * [domainname] [TTL optional] [type] [class optional] [rdata contents]
365 * @return 0 if OK, else error.
367 int ub_ctx_add_ta(struct ub_ctx* ctx, const char* ta);
370 * Add trust anchors to the given context.
371 * Pass name of a file with DS and DNSKEY records (like from dig or drill).
372 * @param ctx: context.
373 * At this time it is only possible to add trusted keys before the
374 * first resolve is done.
375 * @param fname: filename of file with keyfile with trust anchors.
376 * @return 0 if OK, else error.
378 int ub_ctx_add_ta_file(struct ub_ctx* ctx, const char* fname);
381 * Add trust anchor to the given context that is tracked with RFC5011
382 * automated trust anchor maintenance. The file is written to when the
383 * trust anchor is changed.
384 * Pass the name of a file that was output from eg. unbound-anchor,
385 * or you can start it by providing a trusted DNSKEY or DS record on one
387 * @param ctx: context.
388 * At this time it is only possible to add trusted keys before the
389 * first resolve is done.
390 * @param fname: filename of file with trust anchor.
391 * @return 0 if OK, else error.
393 int ub_ctx_add_ta_autr(struct ub_ctx* ctx, const char* fname);
396 * Add trust anchors to the given context.
397 * Pass the name of a bind-style config file with trusted-keys{}.
398 * @param ctx: context.
399 * At this time it is only possible to add trusted keys before the
400 * first resolve is done.
401 * @param fname: filename of file with bind-style config entries with trust
403 * @return 0 if OK, else error.
405 int ub_ctx_trustedkeys(struct ub_ctx* ctx, const char* fname);
408 * Set debug output (and error output) to the specified stream.
409 * Pass NULL to disable. Default is stderr.
410 * @param ctx: context.
411 * @param out: FILE* out file stream to log to.
412 * Type void* to avoid stdio dependency of this header file.
413 * @return 0 if OK, else error.
415 int ub_ctx_debugout(struct ub_ctx* ctx, void* out);
418 * Set debug verbosity for the context
419 * Output is directed to stderr.
420 * @param ctx: context.
421 * @param d: debug level, 0 is off, 1 is very minimal, 2 is detailed,
423 * @return 0 if OK, else error.
425 int ub_ctx_debuglevel(struct ub_ctx* ctx, int d);
428 * Set a context behaviour for asynchronous action.
429 * @param ctx: context.
430 * @param dothread: if true, enables threading and a call to resolve_async()
431 * creates a thread to handle work in the background.
432 * If false, a process is forked to handle work in the background.
433 * Changes to this setting after async() calls have been made have
434 * no effect (delete and re-create the context to change).
435 * @return 0 if OK, else error.
437 int ub_ctx_async(struct ub_ctx* ctx, int dothread);
440 * Poll a context to see if it has any new results
441 * Do not poll in a loop, instead extract the fd below to poll for readiness,
442 * and then check, or wait using the wait routine.
443 * @param ctx: context.
444 * @return: 0 if nothing to read, or nonzero if a result is available.
445 * If nonzero, call ctx_process() to do callbacks.
447 int ub_poll(struct ub_ctx* ctx);
450 * Wait for a context to finish with results. Calls ub_process() after
451 * the wait for you. After the wait, there are no more outstanding
452 * asynchronous queries.
453 * @param ctx: context.
454 * @return: 0 if OK, else error.
456 int ub_wait(struct ub_ctx* ctx);
459 * Get file descriptor. Wait for it to become readable, at this point
460 * answers are returned from the asynchronous validating resolver.
461 * Then call the ub_process to continue processing.
462 * This routine works immediately after context creation, the fd
464 * @param ctx: context.
465 * @return: -1 on error, or file descriptor to use select(2) with.
467 int ub_fd(struct ub_ctx* ctx);
470 * Call this routine to continue processing results from the validating
471 * resolver (when the fd becomes readable).
472 * Will perform necessary callbacks.
473 * @param ctx: context
474 * @return: 0 if OK, else error.
476 int ub_process(struct ub_ctx* ctx);
479 * Perform resolution and validation of the target name.
480 * @param ctx: context.
481 * The context is finalized, and can no longer accept config changes.
482 * @param name: domain name in text format (a zero terminated text string).
483 * @param rrtype: type of RR in host order, 1 is A (address).
484 * @param rrclass: class of RR in host order, 1 is IN (for internet).
485 * @param result: the result data is returned in a newly allocated result
486 * structure. May be NULL on return, return value is set to an error
487 * in that case (out of memory).
488 * @return 0 if OK, else error.
490 int ub_resolve(struct ub_ctx* ctx, const char* name, int rrtype,
491 int rrclass, struct ub_result** result);
494 * Perform resolution and validation of the target name.
495 * Asynchronous, after a while, the callback will be called with your
496 * data and the result.
497 * @param ctx: context.
498 * If no thread or process has been created yet to perform the
499 * work in the background, it is created now.
500 * The context is finalized, and can no longer accept config changes.
501 * @param name: domain name in text format (a string).
502 * @param rrtype: type of RR in host order, 1 is A.
503 * @param rrclass: class of RR in host order, 1 is IN (for internet).
504 * @param mydata: this data is your own data (you can pass NULL),
505 * and is passed on to the callback function.
506 * @param callback: this is called on completion of the resolution.
508 * void callback(void* mydata, int err, struct ub_result* result)
509 * with mydata: the same as passed here, you may pass NULL,
510 * with err: is 0 when a result has been found.
511 * with result: a newly allocated result structure.
512 * The result may be NULL, in that case err is set.
514 * If an error happens during processing, your callback will be called
515 * with error set to a nonzero value (and result==NULL).
516 * @param async_id: if you pass a non-NULL value, an identifier number is
517 * returned for the query as it is in progress. It can be used to
519 * @return 0 if OK, else error.
521 int ub_resolve_async(struct ub_ctx* ctx, const char* name, int rrtype,
522 int rrclass, void* mydata, ub_callback_type callback, int* async_id);
525 * Cancel an async query in progress.
526 * Its callback will not be called.
528 * @param ctx: context.
529 * @param async_id: which query to cancel.
530 * @return 0 if OK, else error.
531 * This routine can return an error if the async_id passed does not exist
532 * or has already been delivered. If another thread is processing results
533 * at the same time, the result may be delivered at the same time and the
534 * cancel fails with an error. Also the cancel can fail due to a system
535 * error, no memory or socket failures.
537 int ub_cancel(struct ub_ctx* ctx, int async_id);
540 * Free storage associated with a result structure.
541 * @param result: to free
543 void ub_resolve_free(struct ub_result* result);
546 * Convert error value to a human readable string.
547 * @param err: error code from one of the libunbound functions.
548 * @return pointer to constant text string, zero terminated.
550 const char* ub_strerror(int err);
553 * Debug routine. Print the local zone information to debug output.
554 * @param ctx: context. Is finalized by the routine.
555 * @return 0 if OK, else error.
557 int ub_ctx_print_local_zones(struct ub_ctx* ctx);
560 * Add a new zone with the zonetype to the local authority info of the
562 * @param ctx: context. Is finalized by the routine.
563 * @param zone_name: name of the zone in text, "example.com"
564 * If it already exists, the type is updated.
565 * @param zone_type: type of the zone (like for unbound.conf) in text.
566 * @return 0 if OK, else error.
568 int ub_ctx_zone_add(struct ub_ctx* ctx, const char *zone_name,
569 const char *zone_type);
572 * Remove zone from local authority info of the library.
573 * @param ctx: context. Is finalized by the routine.
574 * @param zone_name: name of the zone in text, "example.com"
575 * If it does not exist, nothing happens.
576 * @return 0 if OK, else error.
578 int ub_ctx_zone_remove(struct ub_ctx* ctx, const char *zone_name);
581 * Add localdata to the library local authority info.
582 * Similar to local-data config statement.
583 * @param ctx: context. Is finalized by the routine.
584 * @param data: the resource record in text format, for example
585 * "www.example.com IN A 127.0.0.1"
586 * @return 0 if OK, else error.
588 int ub_ctx_data_add(struct ub_ctx* ctx, const char *data);
591 * Remove localdata from the library local authority info.
592 * @param ctx: context. Is finalized by the routine.
593 * @param data: the name to delete all data from, like "www.example.com".
594 * @return 0 if OK, else error.
596 int ub_ctx_data_remove(struct ub_ctx* ctx, const char *data);
599 * Get a version string from the libunbound implementation.
600 * @return a static constant string with the version number.
602 const char* ub_version(void);
605 * Some global statistics that are not in struct stats_info,
606 * this struct is shared on a shm segment (shm-key in unbound.conf)
608 struct ub_shm_stat_info {
612 long long now_sec, now_usec;
613 long long up_sec, up_usec;
614 long long elapsed_sec, elapsed_usec;
628 /** number of qtype that is stored for in array */
629 #define UB_STATS_QTYPE_NUM 256
630 /** number of qclass that is stored for in array */
631 #define UB_STATS_QCLASS_NUM 256
632 /** number of rcodes in stats */
633 #define UB_STATS_RCODE_NUM 16
634 /** number of opcodes in stats */
635 #define UB_STATS_OPCODE_NUM 16
636 /** number of histogram buckets */
637 #define UB_STATS_BUCKET_NUM 40
639 /** per worker statistics. */
640 struct ub_server_stats {
641 /** number of queries from clients received. */
642 long long num_queries;
643 /** number of queries that have been dropped/ratelimited by ip. */
644 long long num_queries_ip_ratelimited;
645 /** number of queries that had a cache-miss. */
646 long long num_queries_missed_cache;
647 /** number of prefetch queries - cachehits with prefetch */
648 long long num_queries_prefetch;
651 * Sum of the querylistsize of the worker for
652 * every query that missed cache. To calculate average.
654 long long sum_query_list_size;
655 /** max value of query list size reached. */
656 long long max_query_list_size;
658 /** Extended stats below (bool) */
662 long long qtype[UB_STATS_QTYPE_NUM];
663 /** bigger qtype values not in array */
666 long long qclass[UB_STATS_QCLASS_NUM];
667 /** bigger qclass values not in array */
668 long long qclass_big;
670 long long qopcode[UB_STATS_OPCODE_NUM];
671 /** number of queries over TCP */
673 /** number of outgoing queries over TCP */
674 long long qtcp_outgoing;
675 /** number of queries over IPv6 */
677 /** number of queries with QR bit */
679 /** number of queries with AA bit */
681 /** number of queries with TC bit */
683 /** number of queries with RD bit */
685 /** number of queries with RA bit */
687 /** number of queries with Z bit */
689 /** number of queries with AD bit */
691 /** number of queries with CD bit */
693 /** number of queries with EDNS OPT record */
695 /** number of queries with EDNS with DO flag */
698 long long ans_rcode[UB_STATS_RCODE_NUM];
699 /** answers with pseudo rcode 'nodata' */
700 long long ans_rcode_nodata;
701 /** answers that were secure (AD) */
702 long long ans_secure;
703 /** answers that were bogus (withheld as SERVFAIL) */
705 /** rrsets marked bogus by validator */
706 long long rrset_bogus;
707 /** unwanted traffic received on server-facing ports */
708 long long unwanted_replies;
709 /** unwanted traffic received on client-facing ports */
710 long long unwanted_queries;
711 /** usage of tcp accept list */
712 long long tcp_accept_usage;
713 /** answers served from expired cache */
714 long long zero_ttl_responses;
715 /** histogram data exported to array
716 * if the array is the same size, no data is lost, and
717 * if all histograms are same size (is so by default) then
718 * adding up works well. */
719 long long hist[UB_STATS_BUCKET_NUM];
721 /** number of message cache entries */
722 long long msg_cache_count;
723 /** number of rrset cache entries */
724 long long rrset_cache_count;
725 /** number of infra cache entries */
726 long long infra_cache_count;
727 /** number of key cache entries */
728 long long key_cache_count;
730 /** number of queries that used dnscrypt */
731 long long num_query_dnscrypt_crypted;
732 /** number of queries that queried dnscrypt certificates */
733 long long num_query_dnscrypt_cert;
734 /** number of queries in clear text and not asking for the certificates */
735 long long num_query_dnscrypt_cleartext;
736 /** number of malformed encrypted queries */
737 long long num_query_dnscrypt_crypted_malformed;
741 * Statistics to send over the control pipe when asked
742 * This struct is made to be memcpied, sent in binary.
743 * shm mapped with (number+1) at num_threads+1, with first as total
745 struct ub_stats_info {
746 /** the thread stats */
747 struct ub_server_stats svr;
749 /** mesh stats: current number of states */
750 long long mesh_num_states;
751 /** mesh stats: current number of reply (user) states */
752 long long mesh_num_reply_states;
753 /** mesh stats: number of reply states overwritten with a new one */
754 long long mesh_jostled;
755 /** mesh stats: number of incoming queries dropped */
756 long long mesh_dropped;
757 /** mesh stats: replies sent */
758 long long mesh_replies_sent;
759 /** mesh stats: sum of waiting times for the replies */
760 long long mesh_replies_sum_wait_sec, mesh_replies_sum_wait_usec;
761 /** mesh stats: median of waiting times for replies (in sec) */
762 double mesh_time_median;
769 #endif /* _UB_UNBOUND_H */