1 /*
2 * daemon/worker.c - worker that handles a pending list of requests.
3 *
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
5 *
6 * This software is open source.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 *
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.
18 *
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.
22 *
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.
34 */
35
36 /**
37 * \file
38 *
39 * This file implements the worker that handles callbacks on events, for
40 * pending requests.
41 */
42 #include "config.h"
43 #include "util/log.h"
44 #include "util/net_help.h"
45 #include "util/random.h"
46 #include "daemon/worker.h"
47 #include "daemon/daemon.h"
48 #include "daemon/remote.h"
49 #include "daemon/acl_list.h"
50 #include "util/netevent.h"
51 #include "util/config_file.h"
52 #include "util/module.h"
53 #include "util/regional.h"
54 #include "util/storage/slabhash.h"
55 #include "services/listen_dnsport.h"
56 #include "services/outside_network.h"
57 #include "services/outbound_list.h"
58 #include "services/cache/rrset.h"
59 #include "services/cache/infra.h"
60 #include "services/cache/dns.h"
61 #include "services/authzone.h"
62 #include "services/mesh.h"
63 #include "services/localzone.h"
64 #include "services/rpz.h"
65 #include "util/data/msgparse.h"
66 #include "util/data/msgencode.h"
67 #include "util/data/dname.h"
68 #include "util/fptr_wlist.h"
69 #include "util/tube.h"
70 #include "util/edns.h"
71 #include "iterator/iter_fwd.h"
72 #include "iterator/iter_hints.h"
73 #include "iterator/iter_utils.h"
74 #include "validator/autotrust.h"
75 #include "validator/val_anchor.h"
76 #include "respip/respip.h"
77 #include "libunbound/context.h"
78 #include "libunbound/libworker.h"
79 #include "sldns/sbuffer.h"
80 #include "sldns/wire2str.h"
81 #include "util/shm_side/shm_main.h"
82 #include "dnscrypt/dnscrypt.h"
83 #include "dnstap/dtstream.h"
84
85 #ifdef HAVE_SYS_TYPES_H
86 # include <sys/types.h>
87 #endif
88 #ifdef HAVE_NETDB_H
89 #include <netdb.h>
90 #endif
91 #include <signal.h>
92 #ifdef UB_ON_WINDOWS
93 #include "winrc/win_svc.h"
94 #endif
95
96 /** Size of an UDP datagram */
97 #define NORMAL_UDP_SIZE 512 /* bytes */
98 /** ratelimit for error responses */
99 #define ERROR_RATELIMIT 100 /* qps */
100
101 /**
102 * seconds to add to prefetch leeway. This is a TTL that expires old rrsets
103 * earlier than they should in order to put the new update into the cache.
104 * This additional value is to make sure that if not all TTLs are equal in
105 * the message to be updated(and replaced), that rrsets with up to this much
106 * extra TTL are also replaced. This means that the resulting new message
107 * will have (most likely) this TTL at least, avoiding very small 'split
108 * second' TTLs due to operators choosing relative primes for TTLs (or so).
109 * Also has to be at least one to break ties (and overwrite cached entry).
110 */
111 #define PREFETCH_EXPIRY_ADD 60
112
113 /** Report on memory usage by this thread and global */
114 static void
worker_mem_report(struct worker * ATTR_UNUSED (worker),struct serviced_query * ATTR_UNUSED (cur_serv))115 worker_mem_report(struct worker* ATTR_UNUSED(worker),
116 struct serviced_query* ATTR_UNUSED(cur_serv))
117 {
118 #ifdef UNBOUND_ALLOC_STATS
119 /* measure memory leakage */
120 extern size_t unbound_mem_alloc, unbound_mem_freed;
121 /* debug func in validator module */
122 size_t total, front, back, mesh, msg, rrset, infra, ac, superac;
123 size_t me, iter, val, anch;
124 int i;
125 #ifdef CLIENT_SUBNET
126 size_t subnet = 0;
127 #endif /* CLIENT_SUBNET */
128 if(verbosity < VERB_ALGO)
129 return;
130 front = listen_get_mem(worker->front);
131 back = outnet_get_mem(worker->back);
132 msg = slabhash_get_mem(worker->env.msg_cache);
133 rrset = slabhash_get_mem(&worker->env.rrset_cache->table);
134 infra = infra_get_mem(worker->env.infra_cache);
135 mesh = mesh_get_mem(worker->env.mesh);
136 ac = alloc_get_mem(&worker->alloc);
137 superac = alloc_get_mem(&worker->daemon->superalloc);
138 anch = anchors_get_mem(worker->env.anchors);
139 iter = 0;
140 val = 0;
141 for(i=0; i<worker->env.mesh->mods.num; i++) {
142 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
143 mods.mod[i]->get_mem));
144 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
145 val += (*worker->env.mesh->mods.mod[i]->get_mem)
146 (&worker->env, i);
147 #ifdef CLIENT_SUBNET
148 else if(strcmp(worker->env.mesh->mods.mod[i]->name,
149 "subnetcache")==0)
150 subnet += (*worker->env.mesh->mods.mod[i]->get_mem)
151 (&worker->env, i);
152 #endif /* CLIENT_SUBNET */
153 else iter += (*worker->env.mesh->mods.mod[i]->get_mem)
154 (&worker->env, i);
155 }
156 me = sizeof(*worker) + sizeof(*worker->base) + sizeof(*worker->comsig)
157 + comm_point_get_mem(worker->cmd_com)
158 + sizeof(worker->rndstate)
159 + regional_get_mem(worker->scratchpad)
160 + sizeof(*worker->env.scratch_buffer)
161 + sldns_buffer_capacity(worker->env.scratch_buffer)
162 + forwards_get_mem(worker->env.fwds)
163 + hints_get_mem(worker->env.hints);
164 if(worker->thread_num == 0)
165 me += acl_list_get_mem(worker->daemon->acl);
166 if(cur_serv) {
167 me += serviced_get_mem(cur_serv);
168 }
169 total = front+back+mesh+msg+rrset+infra+iter+val+ac+superac+me;
170 #ifdef CLIENT_SUBNET
171 total += subnet;
172 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u "
173 "rrset=%u infra=%u iter=%u val=%u subnet=%u anchors=%u "
174 "alloccache=%u globalalloccache=%u me=%u",
175 (unsigned)total, (unsigned)front, (unsigned)back,
176 (unsigned)mesh, (unsigned)msg, (unsigned)rrset, (unsigned)infra,
177 (unsigned)iter, (unsigned)val,
178 (unsigned)subnet, (unsigned)anch, (unsigned)ac,
179 (unsigned)superac, (unsigned)me);
180 #else /* no CLIENT_SUBNET */
181 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u "
182 "rrset=%u infra=%u iter=%u val=%u anchors=%u "
183 "alloccache=%u globalalloccache=%u me=%u",
184 (unsigned)total, (unsigned)front, (unsigned)back,
185 (unsigned)mesh, (unsigned)msg, (unsigned)rrset,
186 (unsigned)infra, (unsigned)iter, (unsigned)val, (unsigned)anch,
187 (unsigned)ac, (unsigned)superac, (unsigned)me);
188 #endif /* CLIENT_SUBNET */
189 log_info("Total heap memory estimate: %u total-alloc: %u "
190 "total-free: %u", (unsigned)total,
191 (unsigned)unbound_mem_alloc, (unsigned)unbound_mem_freed);
192 #else /* no UNBOUND_ALLOC_STATS */
193 size_t val = 0;
194 #ifdef CLIENT_SUBNET
195 size_t subnet = 0;
196 #endif /* CLIENT_SUBNET */
197 int i;
198 if(verbosity < VERB_QUERY)
199 return;
200 for(i=0; i<worker->env.mesh->mods.num; i++) {
201 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
202 mods.mod[i]->get_mem));
203 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
204 val += (*worker->env.mesh->mods.mod[i]->get_mem)
205 (&worker->env, i);
206 #ifdef CLIENT_SUBNET
207 else if(strcmp(worker->env.mesh->mods.mod[i]->name,
208 "subnetcache")==0)
209 subnet += (*worker->env.mesh->mods.mod[i]->get_mem)
210 (&worker->env, i);
211 #endif /* CLIENT_SUBNET */
212 }
213 #ifdef CLIENT_SUBNET
214 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u "
215 "subnet=%u",
216 (unsigned)slabhash_get_mem(worker->env.msg_cache),
217 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table),
218 (unsigned)infra_get_mem(worker->env.infra_cache),
219 (unsigned)val, (unsigned)subnet);
220 #else /* no CLIENT_SUBNET */
221 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u",
222 (unsigned)slabhash_get_mem(worker->env.msg_cache),
223 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table),
224 (unsigned)infra_get_mem(worker->env.infra_cache),
225 (unsigned)val);
226 #endif /* CLIENT_SUBNET */
227 #endif /* UNBOUND_ALLOC_STATS */
228 }
229
230 void
worker_send_cmd(struct worker * worker,enum worker_commands cmd)231 worker_send_cmd(struct worker* worker, enum worker_commands cmd)
232 {
233 uint32_t c = (uint32_t)htonl(cmd);
234 if(!tube_write_msg(worker->cmd, (uint8_t*)&c, sizeof(c), 0)) {
235 log_err("worker send cmd %d failed", (int)cmd);
236 }
237 }
238
239 int
worker_handle_service_reply(struct comm_point * c,void * arg,int error,struct comm_reply * reply_info)240 worker_handle_service_reply(struct comm_point* c, void* arg, int error,
241 struct comm_reply* reply_info)
242 {
243 struct outbound_entry* e = (struct outbound_entry*)arg;
244 struct worker* worker = e->qstate->env->worker;
245 struct serviced_query *sq = e->qsent;
246
247 verbose(VERB_ALGO, "worker svcd callback for qstate %p", e->qstate);
248 if(error != 0) {
249 mesh_report_reply(worker->env.mesh, e, reply_info, error);
250 worker_mem_report(worker, sq);
251 return 0;
252 }
253 /* sanity check. */
254 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
255 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
256 LDNS_PACKET_QUERY
257 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
258 /* error becomes timeout for the module as if this reply
259 * never arrived. */
260 verbose(VERB_ALGO, "worker: bad reply handled as timeout");
261 mesh_report_reply(worker->env.mesh, e, reply_info,
262 NETEVENT_TIMEOUT);
263 worker_mem_report(worker, sq);
264 return 0;
265 }
266 mesh_report_reply(worker->env.mesh, e, reply_info, NETEVENT_NOERROR);
267 worker_mem_report(worker, sq);
268 return 0;
269 }
270
271 /** ratelimit error replies
272 * @param worker: the worker struct with ratelimit counter
273 * @param err: error code that would be wanted.
274 * @return value of err if okay, or -1 if it should be discarded instead.
275 */
276 static int
worker_err_ratelimit(struct worker * worker,int err)277 worker_err_ratelimit(struct worker* worker, int err)
278 {
279 if(worker->err_limit_time == *worker->env.now) {
280 /* see if limit is exceeded for this second */
281 if(worker->err_limit_count++ > ERROR_RATELIMIT)
282 return -1;
283 } else {
284 /* new second, new limits */
285 worker->err_limit_time = *worker->env.now;
286 worker->err_limit_count = 1;
287 }
288 return err;
289 }
290
291 /** check request sanity.
292 * @param pkt: the wire packet to examine for sanity.
293 * @param worker: parameters for checking.
294 * @return error code, 0 OK, or -1 discard.
295 */
296 static int
worker_check_request(sldns_buffer * pkt,struct worker * worker)297 worker_check_request(sldns_buffer* pkt, struct worker* worker)
298 {
299 if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) {
300 verbose(VERB_QUERY, "request too short, discarded");
301 return -1;
302 }
303 if(sldns_buffer_limit(pkt) > NORMAL_UDP_SIZE &&
304 worker->daemon->cfg->harden_large_queries) {
305 verbose(VERB_QUERY, "request too large, discarded");
306 return -1;
307 }
308 if(LDNS_QR_WIRE(sldns_buffer_begin(pkt))) {
309 verbose(VERB_QUERY, "request has QR bit on, discarded");
310 return -1;
311 }
312 if(LDNS_TC_WIRE(sldns_buffer_begin(pkt))) {
313 LDNS_TC_CLR(sldns_buffer_begin(pkt));
314 verbose(VERB_QUERY, "request bad, has TC bit on");
315 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
316 }
317 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY &&
318 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY) {
319 verbose(VERB_QUERY, "request unknown opcode %d",
320 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)));
321 return worker_err_ratelimit(worker, LDNS_RCODE_NOTIMPL);
322 }
323 if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1) {
324 verbose(VERB_QUERY, "request wrong nr qd=%d",
325 LDNS_QDCOUNT(sldns_buffer_begin(pkt)));
326 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
327 }
328 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 0 &&
329 (LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 1 ||
330 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY)) {
331 verbose(VERB_QUERY, "request wrong nr an=%d",
332 LDNS_ANCOUNT(sldns_buffer_begin(pkt)));
333 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
334 }
335 if(LDNS_NSCOUNT(sldns_buffer_begin(pkt)) != 0) {
336 verbose(VERB_QUERY, "request wrong nr ns=%d",
337 LDNS_NSCOUNT(sldns_buffer_begin(pkt)));
338 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
339 }
340 if(LDNS_ARCOUNT(sldns_buffer_begin(pkt)) > 1) {
341 verbose(VERB_QUERY, "request wrong nr ar=%d",
342 LDNS_ARCOUNT(sldns_buffer_begin(pkt)));
343 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
344 }
345 return 0;
346 }
347
348 void
worker_handle_control_cmd(struct tube * ATTR_UNUSED (tube),uint8_t * msg,size_t len,int error,void * arg)349 worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), uint8_t* msg,
350 size_t len, int error, void* arg)
351 {
352 struct worker* worker = (struct worker*)arg;
353 enum worker_commands cmd;
354 if(error != NETEVENT_NOERROR) {
355 free(msg);
356 if(error == NETEVENT_CLOSED)
357 comm_base_exit(worker->base);
358 else log_info("control event: %d", error);
359 return;
360 }
361 if(len != sizeof(uint32_t)) {
362 fatal_exit("bad control msg length %d", (int)len);
363 }
364 cmd = sldns_read_uint32(msg);
365 free(msg);
366 switch(cmd) {
367 case worker_cmd_quit:
368 verbose(VERB_ALGO, "got control cmd quit");
369 comm_base_exit(worker->base);
370 break;
371 case worker_cmd_stats:
372 verbose(VERB_ALGO, "got control cmd stats");
373 server_stats_reply(worker, 1);
374 break;
375 case worker_cmd_stats_noreset:
376 verbose(VERB_ALGO, "got control cmd stats_noreset");
377 server_stats_reply(worker, 0);
378 break;
379 case worker_cmd_remote:
380 verbose(VERB_ALGO, "got control cmd remote");
381 daemon_remote_exec(worker);
382 break;
383 default:
384 log_err("bad command %d", (int)cmd);
385 break;
386 }
387 }
388
389 /** check if a delegation is secure */
390 static enum sec_status
check_delegation_secure(struct reply_info * rep)391 check_delegation_secure(struct reply_info *rep)
392 {
393 /* return smallest security status */
394 size_t i;
395 enum sec_status sec = sec_status_secure;
396 enum sec_status s;
397 size_t num = rep->an_numrrsets + rep->ns_numrrsets;
398 /* check if answer and authority are OK */
399 for(i=0; i<num; i++) {
400 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
401 ->security;
402 if(s < sec)
403 sec = s;
404 }
405 /* in additional, only unchecked triggers revalidation */
406 for(i=num; i<rep->rrset_count; i++) {
407 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
408 ->security;
409 if(s == sec_status_unchecked)
410 return s;
411 }
412 return sec;
413 }
414
415 /** remove nonsecure from a delegation referral additional section */
416 static void
deleg_remove_nonsecure_additional(struct reply_info * rep)417 deleg_remove_nonsecure_additional(struct reply_info* rep)
418 {
419 /* we can simply edit it, since we are working in the scratch region */
420 size_t i;
421 enum sec_status s;
422
423 for(i = rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
424 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
425 ->security;
426 if(s != sec_status_secure) {
427 memmove(rep->rrsets+i, rep->rrsets+i+1,
428 sizeof(struct ub_packed_rrset_key*)*
429 (rep->rrset_count - i - 1));
430 rep->ar_numrrsets--;
431 rep->rrset_count--;
432 i--;
433 }
434 }
435 }
436
437 /** answer nonrecursive query from the cache */
438 static int
answer_norec_from_cache(struct worker * worker,struct query_info * qinfo,uint16_t id,uint16_t flags,struct comm_reply * repinfo,struct edns_data * edns)439 answer_norec_from_cache(struct worker* worker, struct query_info* qinfo,
440 uint16_t id, uint16_t flags, struct comm_reply* repinfo,
441 struct edns_data* edns)
442 {
443 /* for a nonrecursive query return either:
444 * o an error (servfail; we try to avoid this)
445 * o a delegation (closest we have; this routine tries that)
446 * o the answer (checked by answer_from_cache)
447 *
448 * So, grab a delegation from the rrset cache.
449 * Then check if it needs validation, if so, this routine fails,
450 * so that iterator can prime and validator can verify rrsets.
451 */
452 uint16_t udpsize = edns->udp_size;
453 int secure = 0;
454 time_t timenow = *worker->env.now;
455 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
456 && worker->env.need_to_validate;
457 struct dns_msg *msg = NULL;
458 struct delegpt *dp;
459
460 dp = dns_cache_find_delegation(&worker->env, qinfo->qname,
461 qinfo->qname_len, qinfo->qtype, qinfo->qclass,
462 worker->scratchpad, &msg, timenow);
463 if(!dp) { /* no delegation, need to reprime */
464 return 0;
465 }
466 /* In case we have a local alias, copy it into the delegation message.
467 * Shallow copy should be fine, as we'll be done with msg in this
468 * function. */
469 msg->qinfo.local_alias = qinfo->local_alias;
470 if(must_validate) {
471 switch(check_delegation_secure(msg->rep)) {
472 case sec_status_unchecked:
473 /* some rrsets have not been verified yet, go and
474 * let validator do that */
475 return 0;
476 case sec_status_bogus:
477 case sec_status_secure_sentinel_fail:
478 /* some rrsets are bogus, reply servfail */
479 edns->edns_version = EDNS_ADVERTISED_VERSION;
480 edns->udp_size = EDNS_ADVERTISED_SIZE;
481 edns->ext_rcode = 0;
482 edns->bits &= EDNS_DO;
483 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL,
484 msg->rep, LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad,
485 worker->env.now_tv))
486 return 0;
487 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
488 &msg->qinfo, id, flags, edns);
489 if(worker->stats.extended) {
490 worker->stats.ans_bogus++;
491 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL]++;
492 }
493 return 1;
494 case sec_status_secure:
495 /* all rrsets are secure */
496 /* remove non-secure rrsets from the add. section*/
497 if(worker->env.cfg->val_clean_additional)
498 deleg_remove_nonsecure_additional(msg->rep);
499 secure = 1;
500 break;
501 case sec_status_indeterminate:
502 case sec_status_insecure:
503 default:
504 /* not secure */
505 secure = 0;
506 break;
507 }
508 }
509 /* return this delegation from the cache */
510 edns->edns_version = EDNS_ADVERTISED_VERSION;
511 edns->udp_size = EDNS_ADVERTISED_SIZE;
512 edns->ext_rcode = 0;
513 edns->bits &= EDNS_DO;
514 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, msg->rep,
515 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad,
516 worker->env.now_tv))
517 return 0;
518 msg->rep->flags |= BIT_QR|BIT_RA;
519 if(!reply_info_answer_encode(&msg->qinfo, msg->rep, id, flags,
520 repinfo->c->buffer, 0, 1, worker->scratchpad,
521 udpsize, edns, (int)(edns->bits & EDNS_DO), secure)) {
522 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL,
523 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad,
524 worker->env.now_tv))
525 edns->opt_list_inplace_cb_out = NULL;
526 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
527 &msg->qinfo, id, flags, edns);
528 }
529 if(worker->stats.extended) {
530 if(secure) worker->stats.ans_secure++;
531 server_stats_insrcode(&worker->stats, repinfo->c->buffer);
532 }
533 return 1;
534 }
535
536 /** Apply, if applicable, a response IP action to a cached answer.
537 * If the answer is rewritten as a result of an action, '*encode_repp' will
538 * point to the reply info containing the modified answer. '*encode_repp' will
539 * be intact otherwise.
540 * It returns 1 on success, 0 otherwise. */
541 static int
apply_respip_action(struct worker * worker,const struct query_info * qinfo,struct respip_client_info * cinfo,struct reply_info * rep,struct comm_reply * repinfo,struct ub_packed_rrset_key ** alias_rrset,struct reply_info ** encode_repp,struct auth_zones * az)542 apply_respip_action(struct worker* worker, const struct query_info* qinfo,
543 struct respip_client_info* cinfo, struct reply_info* rep,
544 struct comm_reply* repinfo, struct ub_packed_rrset_key** alias_rrset,
545 struct reply_info** encode_repp, struct auth_zones* az)
546 {
547 struct respip_action_info actinfo = {0, 0, 0, 0, NULL, 0, NULL};
548 actinfo.action = respip_none;
549
550 if(qinfo->qtype != LDNS_RR_TYPE_A &&
551 qinfo->qtype != LDNS_RR_TYPE_AAAA &&
552 qinfo->qtype != LDNS_RR_TYPE_ANY)
553 return 1;
554
555 if(!respip_rewrite_reply(qinfo, cinfo, rep, encode_repp, &actinfo,
556 alias_rrset, 0, worker->scratchpad, az))
557 return 0;
558
559 /* xxx_deny actions mean dropping the reply, unless the original reply
560 * was redirected to response-ip data. */
561 if((actinfo.action == respip_deny ||
562 actinfo.action == respip_inform_deny) &&
563 *encode_repp == rep)
564 *encode_repp = NULL;
565
566 /* If address info is returned, it means the action should be an
567 * 'inform' variant and the information should be logged. */
568 if(actinfo.addrinfo) {
569 respip_inform_print(&actinfo, qinfo->qname,
570 qinfo->qtype, qinfo->qclass, qinfo->local_alias,
571 repinfo);
572
573 if(worker->stats.extended && actinfo.rpz_used) {
574 if(actinfo.rpz_disabled)
575 worker->stats.rpz_action[RPZ_DISABLED_ACTION]++;
576 if(actinfo.rpz_cname_override)
577 worker->stats.rpz_action[RPZ_CNAME_OVERRIDE_ACTION]++;
578 else
579 worker->stats.rpz_action[
580 respip_action_to_rpz_action(actinfo.action)]++;
581 }
582 }
583
584 return 1;
585 }
586
587 /** answer query from the cache.
588 * Normally, the answer message will be built in repinfo->c->buffer; if the
589 * answer is supposed to be suppressed or the answer is supposed to be an
590 * incomplete CNAME chain, the buffer is explicitly cleared to signal the
591 * caller as such. In the latter case *partial_rep will point to the incomplete
592 * reply, and this function is (possibly) supposed to be called again with that
593 * *partial_rep value to complete the chain. In addition, if the query should
594 * be completely dropped, '*need_drop' will be set to 1. */
595 static int
answer_from_cache(struct worker * worker,struct query_info * qinfo,struct respip_client_info * cinfo,int * need_drop,int * is_expired_answer,int * is_secure_answer,struct ub_packed_rrset_key ** alias_rrset,struct reply_info ** partial_repp,struct reply_info * rep,uint16_t id,uint16_t flags,struct comm_reply * repinfo,struct edns_data * edns)596 answer_from_cache(struct worker* worker, struct query_info* qinfo,
597 struct respip_client_info* cinfo, int* need_drop, int* is_expired_answer,
598 int* is_secure_answer, struct ub_packed_rrset_key** alias_rrset,
599 struct reply_info** partial_repp,
600 struct reply_info* rep, uint16_t id, uint16_t flags,
601 struct comm_reply* repinfo, struct edns_data* edns)
602 {
603 time_t timenow = *worker->env.now;
604 uint16_t udpsize = edns->udp_size;
605 struct reply_info* encode_rep = rep;
606 struct reply_info* partial_rep = *partial_repp;
607 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
608 && worker->env.need_to_validate;
609 *partial_repp = NULL; /* avoid accidental further pass */
610
611 /* Check TTL */
612 if(rep->ttl < timenow) {
613 /* Check if we need to serve expired now */
614 if(worker->env.cfg->serve_expired &&
615 !worker->env.cfg->serve_expired_client_timeout) {
616 if(worker->env.cfg->serve_expired_ttl &&
617 rep->serve_expired_ttl < timenow)
618 return 0;
619 if(!rrset_array_lock(rep->ref, rep->rrset_count, 0))
620 return 0;
621 *is_expired_answer = 1;
622 } else {
623 /* the rrsets may have been updated in the meantime.
624 * we will refetch the message format from the
625 * authoritative server
626 */
627 return 0;
628 }
629 } else {
630 if(!rrset_array_lock(rep->ref, rep->rrset_count, timenow))
631 return 0;
632 }
633 /* locked and ids and ttls are OK. */
634
635 /* check CNAME chain (if any) */
636 if(rep->an_numrrsets > 0 && (rep->rrsets[0]->rk.type ==
637 htons(LDNS_RR_TYPE_CNAME) || rep->rrsets[0]->rk.type ==
638 htons(LDNS_RR_TYPE_DNAME))) {
639 if(!reply_check_cname_chain(qinfo, rep)) {
640 /* cname chain invalid, redo iterator steps */
641 verbose(VERB_ALGO, "Cache reply: cname chain broken");
642 goto bail_out;
643 }
644 }
645 /* check security status of the cached answer */
646 if(must_validate && (rep->security == sec_status_bogus ||
647 rep->security == sec_status_secure_sentinel_fail)) {
648 /* BAD cached */
649 edns->edns_version = EDNS_ADVERTISED_VERSION;
650 edns->udp_size = EDNS_ADVERTISED_SIZE;
651 edns->ext_rcode = 0;
652 edns->bits &= EDNS_DO;
653 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, rep,
654 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad,
655 worker->env.now_tv))
656 goto bail_out;
657 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
658 qinfo, id, flags, edns);
659 rrset_array_unlock_touch(worker->env.rrset_cache,
660 worker->scratchpad, rep->ref, rep->rrset_count);
661 if(worker->stats.extended) {
662 worker->stats.ans_bogus ++;
663 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL] ++;
664 }
665 return 1;
666 } else if(rep->security == sec_status_unchecked && must_validate) {
667 verbose(VERB_ALGO, "Cache reply: unchecked entry needs "
668 "validation");
669 goto bail_out; /* need to validate cache entry first */
670 } else if(rep->security == sec_status_secure) {
671 if(reply_all_rrsets_secure(rep)) {
672 *is_secure_answer = 1;
673 } else {
674 if(must_validate) {
675 verbose(VERB_ALGO, "Cache reply: secure entry"
676 " changed status");
677 goto bail_out; /* rrset changed, re-verify */
678 }
679 *is_secure_answer = 0;
680 }
681 } else *is_secure_answer = 0;
682
683 edns->edns_version = EDNS_ADVERTISED_VERSION;
684 edns->udp_size = EDNS_ADVERTISED_SIZE;
685 edns->ext_rcode = 0;
686 edns->bits &= EDNS_DO;
687 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, rep,
688 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad,
689 worker->env.now_tv))
690 goto bail_out;
691 *alias_rrset = NULL; /* avoid confusion if caller set it to non-NULL */
692 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) &&
693 !partial_rep && !apply_respip_action(worker, qinfo, cinfo, rep,
694 repinfo, alias_rrset,
695 &encode_rep, worker->env.auth_zones)) {
696 goto bail_out;
697 } else if(partial_rep &&
698 !respip_merge_cname(partial_rep, qinfo, rep, cinfo,
699 must_validate, &encode_rep, worker->scratchpad,
700 worker->env.auth_zones)) {
701 goto bail_out;
702 }
703 if(encode_rep != rep) {
704 /* if rewritten, it can't be considered "secure" */
705 *is_secure_answer = 0;
706 }
707 if(!encode_rep || *alias_rrset) {
708 if(!encode_rep)
709 *need_drop = 1;
710 else {
711 /* If a partial CNAME chain is found, we first need to
712 * make a copy of the reply in the scratchpad so we
713 * can release the locks and lookup the cache again. */
714 *partial_repp = reply_info_copy(encode_rep, NULL,
715 worker->scratchpad);
716 if(!*partial_repp)
717 goto bail_out;
718 }
719 } else if(!reply_info_answer_encode(qinfo, encode_rep, id, flags,
720 repinfo->c->buffer, timenow, 1, worker->scratchpad,
721 udpsize, edns, (int)(edns->bits & EDNS_DO), *is_secure_answer)) {
722 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL,
723 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad,
724 worker->env.now_tv))
725 edns->opt_list_inplace_cb_out = NULL;
726 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
727 qinfo, id, flags, edns);
728 }
729 /* cannot send the reply right now, because blocking network syscall
730 * is bad while holding locks. */
731 rrset_array_unlock_touch(worker->env.rrset_cache, worker->scratchpad,
732 rep->ref, rep->rrset_count);
733 /* go and return this buffer to the client */
734 return 1;
735
736 bail_out:
737 rrset_array_unlock_touch(worker->env.rrset_cache,
738 worker->scratchpad, rep->ref, rep->rrset_count);
739 return 0;
740 }
741
742 /** Reply to client and perform prefetch to keep cache up to date. */
743 static void
reply_and_prefetch(struct worker * worker,struct query_info * qinfo,uint16_t flags,struct comm_reply * repinfo,time_t leeway,int noreply)744 reply_and_prefetch(struct worker* worker, struct query_info* qinfo,
745 uint16_t flags, struct comm_reply* repinfo, time_t leeway, int noreply)
746 {
747 /* first send answer to client to keep its latency
748 * as small as a cachereply */
749 if(!noreply) {
750 if(repinfo->c->tcp_req_info) {
751 sldns_buffer_copy(
752 repinfo->c->tcp_req_info->spool_buffer,
753 repinfo->c->buffer);
754 }
755 comm_point_send_reply(repinfo);
756 }
757 server_stats_prefetch(&worker->stats, worker);
758
759 /* create the prefetch in the mesh as a normal lookup without
760 * client addrs waiting, which has the cache blacklisted (to bypass
761 * the cache and go to the network for the data). */
762 /* this (potentially) runs the mesh for the new query */
763 mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway +
764 PREFETCH_EXPIRY_ADD);
765 }
766
767 /**
768 * Fill CH class answer into buffer. Keeps query.
769 * @param pkt: buffer
770 * @param str: string to put into text record (<255).
771 * array of strings, every string becomes a text record.
772 * @param num: number of strings in array.
773 * @param edns: edns reply information.
774 * @param worker: worker with scratch region.
775 * @param repinfo: reply information for a communication point.
776 */
777 static void
chaos_replystr(sldns_buffer * pkt,char ** str,int num,struct edns_data * edns,struct worker * worker,struct comm_reply * repinfo)778 chaos_replystr(sldns_buffer* pkt, char** str, int num, struct edns_data* edns,
779 struct worker* worker, struct comm_reply* repinfo)
780 {
781 int i;
782 unsigned int rd = LDNS_RD_WIRE(sldns_buffer_begin(pkt));
783 unsigned int cd = LDNS_CD_WIRE(sldns_buffer_begin(pkt));
784 size_t udpsize = edns->udp_size;
785 edns->edns_version = EDNS_ADVERTISED_VERSION;
786 edns->udp_size = EDNS_ADVERTISED_SIZE;
787 edns->bits &= EDNS_DO;
788 if(!inplace_cb_reply_local_call(&worker->env, NULL, NULL, NULL,
789 LDNS_RCODE_NOERROR, edns, repinfo, worker->scratchpad,
790 worker->env.now_tv))
791 edns->opt_list_inplace_cb_out = NULL;
792 sldns_buffer_clear(pkt);
793 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip id */
794 sldns_buffer_write_u16(pkt, (uint16_t)(BIT_QR|BIT_RA));
795 if(rd) LDNS_RD_SET(sldns_buffer_begin(pkt));
796 if(cd) LDNS_CD_SET(sldns_buffer_begin(pkt));
797 sldns_buffer_write_u16(pkt, 1); /* qdcount */
798 sldns_buffer_write_u16(pkt, (uint16_t)num); /* ancount */
799 sldns_buffer_write_u16(pkt, 0); /* nscount */
800 sldns_buffer_write_u16(pkt, 0); /* arcount */
801 (void)query_dname_len(pkt); /* skip qname */
802 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qtype */
803 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qclass */
804 for(i=0; i<num; i++) {
805 size_t len = strlen(str[i]);
806 if(len>255) len=255; /* cap size of TXT record */
807 if(sldns_buffer_position(pkt)+2+2+2+4+2+1+len+
808 calc_edns_field_size(edns) > udpsize) {
809 sldns_buffer_write_u16_at(pkt, 6, i); /* ANCOUNT */
810 LDNS_TC_SET(sldns_buffer_begin(pkt));
811 break;
812 }
813 sldns_buffer_write_u16(pkt, 0xc00c); /* compr ptr to query */
814 sldns_buffer_write_u16(pkt, LDNS_RR_TYPE_TXT);
815 sldns_buffer_write_u16(pkt, LDNS_RR_CLASS_CH);
816 sldns_buffer_write_u32(pkt, 0); /* TTL */
817 sldns_buffer_write_u16(pkt, sizeof(uint8_t) + len);
818 sldns_buffer_write_u8(pkt, len);
819 sldns_buffer_write(pkt, str[i], len);
820 }
821 sldns_buffer_flip(pkt);
822 if(sldns_buffer_capacity(pkt) >=
823 sldns_buffer_limit(pkt)+calc_edns_field_size(edns))
824 attach_edns_record(pkt, edns);
825 }
826
827 /** Reply with one string */
828 static void
chaos_replyonestr(sldns_buffer * pkt,const char * str,struct edns_data * edns,struct worker * worker,struct comm_reply * repinfo)829 chaos_replyonestr(sldns_buffer* pkt, const char* str, struct edns_data* edns,
830 struct worker* worker, struct comm_reply* repinfo)
831 {
832 chaos_replystr(pkt, (char**)&str, 1, edns, worker, repinfo);
833 }
834
835 /**
836 * Create CH class trustanchor answer.
837 * @param pkt: buffer
838 * @param edns: edns reply information.
839 * @param w: worker with scratch region.
840 * @param repinfo: reply information for a communication point.
841 */
842 static void
chaos_trustanchor(sldns_buffer * pkt,struct edns_data * edns,struct worker * w,struct comm_reply * repinfo)843 chaos_trustanchor(sldns_buffer* pkt, struct edns_data* edns, struct worker* w,
844 struct comm_reply* repinfo)
845 {
846 #define TA_RESPONSE_MAX_TXT 16 /* max number of TXT records */
847 #define TA_RESPONSE_MAX_TAGS 32 /* max number of tags printed per zone */
848 char* str_array[TA_RESPONSE_MAX_TXT];
849 uint16_t tags[TA_RESPONSE_MAX_TAGS];
850 int num = 0;
851 struct trust_anchor* ta;
852
853 if(!w->env.need_to_validate) {
854 /* no validator module, reply no trustanchors */
855 chaos_replystr(pkt, NULL, 0, edns, w, repinfo);
856 return;
857 }
858
859 /* fill the string with contents */
860 lock_basic_lock(&w->env.anchors->lock);
861 RBTREE_FOR(ta, struct trust_anchor*, w->env.anchors->tree) {
862 char* str;
863 size_t i, numtag, str_len = 255;
864 if(num == TA_RESPONSE_MAX_TXT) continue;
865 str = (char*)regional_alloc(w->scratchpad, str_len);
866 if(!str) continue;
867 lock_basic_lock(&ta->lock);
868 numtag = anchor_list_keytags(ta, tags, TA_RESPONSE_MAX_TAGS);
869 if(numtag == 0) {
870 /* empty, insecure point */
871 lock_basic_unlock(&ta->lock);
872 continue;
873 }
874 str_array[num] = str;
875 num++;
876
877 /* spool name of anchor */
878 (void)sldns_wire2str_dname_buf(ta->name, ta->namelen, str, str_len);
879 str_len -= strlen(str); str += strlen(str);
880 /* spool tags */
881 for(i=0; i<numtag; i++) {
882 snprintf(str, str_len, " %u", (unsigned)tags[i]);
883 str_len -= strlen(str); str += strlen(str);
884 }
885 lock_basic_unlock(&ta->lock);
886 }
887 lock_basic_unlock(&w->env.anchors->lock);
888
889 chaos_replystr(pkt, str_array, num, edns, w, repinfo);
890 regional_free_all(w->scratchpad);
891 }
892
893 /**
894 * Answer CH class queries.
895 * @param w: worker
896 * @param qinfo: query info. Pointer into packet buffer.
897 * @param edns: edns info from query.
898 * @param repinfo: reply information for a communication point.
899 * @param pkt: packet buffer.
900 * @return: true if a reply is to be sent.
901 */
902 static int
answer_chaos(struct worker * w,struct query_info * qinfo,struct edns_data * edns,struct comm_reply * repinfo,sldns_buffer * pkt)903 answer_chaos(struct worker* w, struct query_info* qinfo,
904 struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* pkt)
905 {
906 struct config_file* cfg = w->env.cfg;
907 if(qinfo->qtype != LDNS_RR_TYPE_ANY && qinfo->qtype != LDNS_RR_TYPE_TXT)
908 return 0;
909 if(query_dname_compare(qinfo->qname,
910 (uint8_t*)"\002id\006server") == 0 ||
911 query_dname_compare(qinfo->qname,
912 (uint8_t*)"\010hostname\004bind") == 0)
913 {
914 if(cfg->hide_identity)
915 return 0;
916 if(cfg->identity==NULL || cfg->identity[0]==0) {
917 char buf[MAXHOSTNAMELEN+1];
918 if (gethostname(buf, MAXHOSTNAMELEN) == 0) {
919 buf[MAXHOSTNAMELEN] = 0;
920 chaos_replyonestr(pkt, buf, edns, w, repinfo);
921 } else {
922 log_err("gethostname: %s", strerror(errno));
923 chaos_replyonestr(pkt, "no hostname", edns, w, repinfo);
924 }
925 }
926 else chaos_replyonestr(pkt, cfg->identity, edns, w, repinfo);
927 return 1;
928 }
929 if(query_dname_compare(qinfo->qname,
930 (uint8_t*)"\007version\006server") == 0 ||
931 query_dname_compare(qinfo->qname,
932 (uint8_t*)"\007version\004bind") == 0)
933 {
934 if(cfg->hide_version)
935 return 0;
936 if(cfg->version==NULL || cfg->version[0]==0)
937 chaos_replyonestr(pkt, PACKAGE_STRING, edns, w, repinfo);
938 else chaos_replyonestr(pkt, cfg->version, edns, w, repinfo);
939 return 1;
940 }
941 if(query_dname_compare(qinfo->qname,
942 (uint8_t*)"\013trustanchor\007unbound") == 0)
943 {
944 if(cfg->hide_trustanchor)
945 return 0;
946 chaos_trustanchor(pkt, edns, w, repinfo);
947 return 1;
948 }
949
950 return 0;
951 }
952
953 /**
954 * Answer notify queries. These are notifies for authoritative zones,
955 * the reply is an ack that the notify has been received. We need to check
956 * access permission here.
957 * @param w: worker
958 * @param qinfo: query info. Pointer into packet buffer.
959 * @param edns: edns info from query.
960 * @param repinfo: reply info with source address.
961 * @param pkt: packet buffer.
962 */
963 static void
answer_notify(struct worker * w,struct query_info * qinfo,struct edns_data * edns,sldns_buffer * pkt,struct comm_reply * repinfo)964 answer_notify(struct worker* w, struct query_info* qinfo,
965 struct edns_data* edns, sldns_buffer* pkt, struct comm_reply* repinfo)
966 {
967 int refused = 0;
968 int rcode = LDNS_RCODE_NOERROR;
969 uint32_t serial = 0;
970 int has_serial;
971 if(!w->env.auth_zones) return;
972 has_serial = auth_zone_parse_notify_serial(pkt, &serial);
973 if(auth_zones_notify(w->env.auth_zones, &w->env, qinfo->qname,
974 qinfo->qname_len, qinfo->qclass, &repinfo->addr,
975 repinfo->addrlen, has_serial, serial, &refused)) {
976 rcode = LDNS_RCODE_NOERROR;
977 } else {
978 if(refused)
979 rcode = LDNS_RCODE_REFUSED;
980 else rcode = LDNS_RCODE_SERVFAIL;
981 }
982
983 if(verbosity >= VERB_DETAIL) {
984 char buf[380];
985 char zname[255+1];
986 char sr[25];
987 dname_str(qinfo->qname, zname);
988 sr[0]=0;
989 if(has_serial)
990 snprintf(sr, sizeof(sr), "serial %u ",
991 (unsigned)serial);
992 if(rcode == LDNS_RCODE_REFUSED)
993 snprintf(buf, sizeof(buf),
994 "refused NOTIFY %sfor %s from", sr, zname);
995 else if(rcode == LDNS_RCODE_SERVFAIL)
996 snprintf(buf, sizeof(buf),
997 "servfail for NOTIFY %sfor %s from", sr, zname);
998 else snprintf(buf, sizeof(buf),
999 "received NOTIFY %sfor %s from", sr, zname);
1000 log_addr(VERB_DETAIL, buf, &repinfo->addr, repinfo->addrlen);
1001 }
1002 edns->edns_version = EDNS_ADVERTISED_VERSION;
1003 edns->udp_size = EDNS_ADVERTISED_SIZE;
1004 edns->ext_rcode = 0;
1005 edns->bits &= EDNS_DO;
1006 error_encode(pkt, rcode, qinfo,
1007 *(uint16_t*)(void *)sldns_buffer_begin(pkt),
1008 sldns_buffer_read_u16_at(pkt, 2), edns);
1009 LDNS_OPCODE_SET(sldns_buffer_begin(pkt), LDNS_PACKET_NOTIFY);
1010 }
1011
1012 static int
deny_refuse(struct comm_point * c,enum acl_access acl,enum acl_access deny,enum acl_access refuse,struct worker * worker,struct comm_reply * repinfo)1013 deny_refuse(struct comm_point* c, enum acl_access acl,
1014 enum acl_access deny, enum acl_access refuse,
1015 struct worker* worker, struct comm_reply* repinfo)
1016 {
1017 if(acl == deny) {
1018 comm_point_drop_reply(repinfo);
1019 if(worker->stats.extended)
1020 worker->stats.unwanted_queries++;
1021 return 0;
1022 } else if(acl == refuse) {
1023 log_addr(VERB_ALGO, "refused query from",
1024 &repinfo->addr, repinfo->addrlen);
1025 log_buf(VERB_ALGO, "refuse", c->buffer);
1026 if(worker->stats.extended)
1027 worker->stats.unwanted_queries++;
1028 if(worker_check_request(c->buffer, worker) == -1) {
1029 comm_point_drop_reply(repinfo);
1030 return 0; /* discard this */
1031 }
1032 sldns_buffer_set_limit(c->buffer, LDNS_HEADER_SIZE);
1033 sldns_buffer_write_at(c->buffer, 4,
1034 (uint8_t*)"\0\0\0\0\0\0\0\0", 8);
1035 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1036 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1037 LDNS_RCODE_REFUSED);
1038 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE);
1039 sldns_buffer_flip(c->buffer);
1040 return 1;
1041 }
1042
1043 return -1;
1044 }
1045
1046 static int
deny_refuse_all(struct comm_point * c,enum acl_access acl,struct worker * worker,struct comm_reply * repinfo)1047 deny_refuse_all(struct comm_point* c, enum acl_access acl,
1048 struct worker* worker, struct comm_reply* repinfo)
1049 {
1050 return deny_refuse(c, acl, acl_deny, acl_refuse, worker, repinfo);
1051 }
1052
1053 static int
deny_refuse_non_local(struct comm_point * c,enum acl_access acl,struct worker * worker,struct comm_reply * repinfo)1054 deny_refuse_non_local(struct comm_point* c, enum acl_access acl,
1055 struct worker* worker, struct comm_reply* repinfo)
1056 {
1057 return deny_refuse(c, acl, acl_deny_non_local, acl_refuse_non_local, worker, repinfo);
1058 }
1059
1060 int
worker_handle_request(struct comm_point * c,void * arg,int error,struct comm_reply * repinfo)1061 worker_handle_request(struct comm_point* c, void* arg, int error,
1062 struct comm_reply* repinfo)
1063 {
1064 struct worker* worker = (struct worker*)arg;
1065 int ret;
1066 hashvalue_type h;
1067 struct lruhash_entry* e;
1068 struct query_info qinfo;
1069 struct edns_data edns;
1070 enum acl_access acl;
1071 struct acl_addr* acladdr;
1072 int rc = 0;
1073 int need_drop = 0;
1074 int is_expired_answer = 0;
1075 int is_secure_answer = 0;
1076 /* We might have to chase a CNAME chain internally, in which case
1077 * we'll have up to two replies and combine them to build a complete
1078 * answer. These variables control this case. */
1079 struct ub_packed_rrset_key* alias_rrset = NULL;
1080 struct reply_info* partial_rep = NULL;
1081 struct query_info* lookup_qinfo = &qinfo;
1082 struct query_info qinfo_tmp; /* placeholder for lookup_qinfo */
1083 struct respip_client_info* cinfo = NULL, cinfo_tmp;
1084 memset(&qinfo, 0, sizeof(qinfo));
1085
1086 if((error != NETEVENT_NOERROR && error != NETEVENT_DONE)|| !repinfo) {
1087 /* some bad tcp query DNS formats give these error calls */
1088 verbose(VERB_ALGO, "handle request called with err=%d", error);
1089 return 0;
1090 }
1091 #ifdef USE_DNSCRYPT
1092 repinfo->max_udp_size = worker->daemon->cfg->max_udp_size;
1093 if(!dnsc_handle_curved_request(worker->daemon->dnscenv, repinfo)) {
1094 worker->stats.num_query_dnscrypt_crypted_malformed++;
1095 return 0;
1096 }
1097 if(c->dnscrypt && !repinfo->is_dnscrypted) {
1098 char buf[LDNS_MAX_DOMAINLEN+1];
1099 /* Check if this is unencrypted and asking for certs */
1100 if(worker_check_request(c->buffer, worker) != 0) {
1101 verbose(VERB_ALGO,
1102 "dnscrypt: worker check request: bad query.");
1103 log_addr(VERB_CLIENT,"from",&repinfo->addr,
1104 repinfo->addrlen);
1105 comm_point_drop_reply(repinfo);
1106 return 0;
1107 }
1108 if(!query_info_parse(&qinfo, c->buffer)) {
1109 verbose(VERB_ALGO,
1110 "dnscrypt: worker parse request: formerror.");
1111 log_addr(VERB_CLIENT, "from", &repinfo->addr,
1112 repinfo->addrlen);
1113 comm_point_drop_reply(repinfo);
1114 return 0;
1115 }
1116 dname_str(qinfo.qname, buf);
1117 if(!(qinfo.qtype == LDNS_RR_TYPE_TXT &&
1118 strcasecmp(buf,
1119 worker->daemon->dnscenv->provider_name) == 0)) {
1120 verbose(VERB_ALGO,
1121 "dnscrypt: not TXT \"%s\". Received: %s \"%s\"",
1122 worker->daemon->dnscenv->provider_name,
1123 sldns_rr_descript(qinfo.qtype)->_name,
1124 buf);
1125 comm_point_drop_reply(repinfo);
1126 worker->stats.num_query_dnscrypt_cleartext++;
1127 return 0;
1128 }
1129 worker->stats.num_query_dnscrypt_cert++;
1130 sldns_buffer_rewind(c->buffer);
1131 } else if(c->dnscrypt && repinfo->is_dnscrypted) {
1132 worker->stats.num_query_dnscrypt_crypted++;
1133 }
1134 #endif
1135 #ifdef USE_DNSTAP
1136 /*
1137 * sending src (client)/dst (local service) addresses over DNSTAP from incoming request handler
1138 */
1139 if(worker->dtenv.log_client_query_messages) {
1140 log_addr(VERB_ALGO, "request from client", &repinfo->addr, repinfo->addrlen);
1141 log_addr(VERB_ALGO, "to local addr", (void*)repinfo->c->socket->addr->ai_addr, repinfo->c->socket->addr->ai_addrlen);
1142 dt_msg_send_client_query(&worker->dtenv, &repinfo->addr, (void*)repinfo->c->socket->addr->ai_addr, c->type, c->buffer);
1143 }
1144 #endif
1145 acladdr = acl_addr_lookup(worker->daemon->acl, &repinfo->addr,
1146 repinfo->addrlen);
1147 acl = acl_get_control(acladdr);
1148 if((ret=deny_refuse_all(c, acl, worker, repinfo)) != -1)
1149 {
1150 if(ret == 1)
1151 goto send_reply;
1152 return ret;
1153 }
1154 if((ret=worker_check_request(c->buffer, worker)) != 0) {
1155 verbose(VERB_ALGO, "worker check request: bad query.");
1156 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1157 if(ret != -1) {
1158 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1159 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
1160 return 1;
1161 }
1162 comm_point_drop_reply(repinfo);
1163 return 0;
1164 }
1165
1166 worker->stats.num_queries++;
1167
1168 /* check if this query should be dropped based on source ip rate limiting */
1169 if(!infra_ip_ratelimit_inc(worker->env.infra_cache, repinfo,
1170 *worker->env.now, c->buffer)) {
1171 /* See if we are passed through with slip factor */
1172 if(worker->env.cfg->ip_ratelimit_factor != 0 &&
1173 ub_random_max(worker->env.rnd,
1174 worker->env.cfg->ip_ratelimit_factor) == 0) {
1175
1176 char addrbuf[128];
1177 addr_to_str(&repinfo->addr, repinfo->addrlen,
1178 addrbuf, sizeof(addrbuf));
1179 verbose(VERB_QUERY, "ip_ratelimit allowed through for ip address %s because of slip in ip_ratelimit_factor",
1180 addrbuf);
1181 } else {
1182 worker->stats.num_queries_ip_ratelimited++;
1183 comm_point_drop_reply(repinfo);
1184 return 0;
1185 }
1186 }
1187
1188 /* see if query is in the cache */
1189 if(!query_info_parse(&qinfo, c->buffer)) {
1190 verbose(VERB_ALGO, "worker parse request: formerror.");
1191 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1192 memset(&qinfo, 0, sizeof(qinfo)); /* zero qinfo.qname */
1193 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) {
1194 comm_point_drop_reply(repinfo);
1195 return 0;
1196 }
1197 sldns_buffer_rewind(c->buffer);
1198 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1199 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1200 LDNS_RCODE_FORMERR);
1201 goto send_reply;
1202 }
1203 if(worker->env.cfg->log_queries) {
1204 char ip[128];
1205 addr_to_str(&repinfo->addr, repinfo->addrlen, ip, sizeof(ip));
1206 log_query_in(ip, qinfo.qname, qinfo.qtype, qinfo.qclass);
1207 }
1208 if(qinfo.qtype == LDNS_RR_TYPE_AXFR ||
1209 qinfo.qtype == LDNS_RR_TYPE_IXFR) {
1210 verbose(VERB_ALGO, "worker request: refused zone transfer.");
1211 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1212 sldns_buffer_rewind(c->buffer);
1213 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1214 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1215 LDNS_RCODE_REFUSED);
1216 if(worker->stats.extended) {
1217 worker->stats.qtype[qinfo.qtype]++;
1218 }
1219 goto send_reply;
1220 }
1221 if(qinfo.qtype == LDNS_RR_TYPE_OPT ||
1222 qinfo.qtype == LDNS_RR_TYPE_TSIG ||
1223 qinfo.qtype == LDNS_RR_TYPE_TKEY ||
1224 qinfo.qtype == LDNS_RR_TYPE_MAILA ||
1225 qinfo.qtype == LDNS_RR_TYPE_MAILB ||
1226 (qinfo.qtype >= 128 && qinfo.qtype <= 248)) {
1227 verbose(VERB_ALGO, "worker request: formerror for meta-type.");
1228 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1229 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) {
1230 comm_point_drop_reply(repinfo);
1231 return 0;
1232 }
1233 sldns_buffer_rewind(c->buffer);
1234 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1235 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1236 LDNS_RCODE_FORMERR);
1237 if(worker->stats.extended) {
1238 worker->stats.qtype[qinfo.qtype]++;
1239 }
1240 goto send_reply;
1241 }
1242 if((ret=parse_edns_from_query_pkt(c->buffer, &edns, worker->env.cfg, c,
1243 worker->scratchpad)) != 0) {
1244 struct edns_data reply_edns;
1245 verbose(VERB_ALGO, "worker parse edns: formerror.");
1246 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1247 memset(&reply_edns, 0, sizeof(reply_edns));
1248 reply_edns.edns_present = 1;
1249 reply_edns.udp_size = EDNS_ADVERTISED_SIZE;
1250 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
1251 error_encode(c->buffer, ret, &qinfo,
1252 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1253 sldns_buffer_read_u16_at(c->buffer, 2), &reply_edns);
1254 regional_free_all(worker->scratchpad);
1255 goto send_reply;
1256 }
1257 if(edns.edns_present) {
1258 if(edns.edns_version != 0) {
1259 edns.ext_rcode = (uint8_t)(EDNS_RCODE_BADVERS>>4);
1260 edns.edns_version = EDNS_ADVERTISED_VERSION;
1261 edns.udp_size = EDNS_ADVERTISED_SIZE;
1262 edns.bits &= EDNS_DO;
1263 edns.opt_list_in = NULL;
1264 edns.opt_list_out = NULL;
1265 edns.opt_list_inplace_cb_out = NULL;
1266 edns.padding_block_size = 0;
1267 verbose(VERB_ALGO, "query with bad edns version.");
1268 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1269 error_encode(c->buffer, EDNS_RCODE_BADVERS&0xf, &qinfo,
1270 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1271 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1272 if(sldns_buffer_capacity(c->buffer) >=
1273 sldns_buffer_limit(c->buffer)+calc_edns_field_size(&edns))
1274 attach_edns_record(c->buffer, &edns);
1275 regional_free_all(worker->scratchpad);
1276 goto send_reply;
1277 }
1278 if(edns.udp_size < NORMAL_UDP_SIZE &&
1279 worker->daemon->cfg->harden_short_bufsize) {
1280 verbose(VERB_QUERY, "worker request: EDNS bufsize %d ignored",
1281 (int)edns.udp_size);
1282 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1283 edns.udp_size = NORMAL_UDP_SIZE;
1284 }
1285 }
1286 if(edns.udp_size > worker->daemon->cfg->max_udp_size &&
1287 c->type == comm_udp) {
1288 verbose(VERB_QUERY,
1289 "worker request: max UDP reply size modified"
1290 " (%d to max-udp-size)", (int)edns.udp_size);
1291 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1292 edns.udp_size = worker->daemon->cfg->max_udp_size;
1293 }
1294 if(edns.udp_size < LDNS_HEADER_SIZE) {
1295 verbose(VERB_ALGO, "worker request: edns is too small.");
1296 log_addr(VERB_CLIENT, "from", &repinfo->addr, repinfo->addrlen);
1297 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1298 LDNS_TC_SET(sldns_buffer_begin(c->buffer));
1299 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1300 LDNS_RCODE_SERVFAIL);
1301 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE);
1302 sldns_buffer_write_at(c->buffer, 4,
1303 (uint8_t*)"\0\0\0\0\0\0\0\0", 8);
1304 sldns_buffer_flip(c->buffer);
1305 regional_free_all(worker->scratchpad);
1306 goto send_reply;
1307 }
1308 if(worker->stats.extended)
1309 server_stats_insquery(&worker->stats, c, qinfo.qtype,
1310 qinfo.qclass, &edns, repinfo);
1311 if(c->type != comm_udp)
1312 edns.udp_size = 65535; /* max size for TCP replies */
1313 if(qinfo.qclass == LDNS_RR_CLASS_CH && answer_chaos(worker, &qinfo,
1314 &edns, repinfo, c->buffer)) {
1315 regional_free_all(worker->scratchpad);
1316 goto send_reply;
1317 }
1318 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
1319 LDNS_PACKET_NOTIFY) {
1320 answer_notify(worker, &qinfo, &edns, c->buffer, repinfo);
1321 regional_free_all(worker->scratchpad);
1322 goto send_reply;
1323 }
1324 if(local_zones_answer(worker->daemon->local_zones, &worker->env, &qinfo,
1325 &edns, c->buffer, worker->scratchpad, repinfo, acladdr->taglist,
1326 acladdr->taglen, acladdr->tag_actions,
1327 acladdr->tag_actions_size, acladdr->tag_datas,
1328 acladdr->tag_datas_size, worker->daemon->cfg->tagname,
1329 worker->daemon->cfg->num_tags, acladdr->view)) {
1330 regional_free_all(worker->scratchpad);
1331 if(sldns_buffer_limit(c->buffer) == 0) {
1332 comm_point_drop_reply(repinfo);
1333 return 0;
1334 }
1335 goto send_reply;
1336 }
1337 if(worker->env.auth_zones &&
1338 rpz_callback_from_worker_request(worker->env.auth_zones,
1339 &worker->env, &qinfo, &edns, c->buffer, worker->scratchpad,
1340 repinfo, acladdr->taglist, acladdr->taglen, &worker->stats)) {
1341 regional_free_all(worker->scratchpad);
1342 if(sldns_buffer_limit(c->buffer) == 0) {
1343 comm_point_drop_reply(repinfo);
1344 return 0;
1345 }
1346 goto send_reply;
1347 }
1348 if(worker->env.auth_zones &&
1349 auth_zones_answer(worker->env.auth_zones, &worker->env,
1350 &qinfo, &edns, repinfo, c->buffer, worker->scratchpad)) {
1351 regional_free_all(worker->scratchpad);
1352 if(sldns_buffer_limit(c->buffer) == 0) {
1353 comm_point_drop_reply(repinfo);
1354 return 0;
1355 }
1356 /* set RA for everyone that can have recursion (based on
1357 * access control list) */
1358 if(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer)) &&
1359 acl != acl_deny_non_local && acl != acl_refuse_non_local)
1360 LDNS_RA_SET(sldns_buffer_begin(c->buffer));
1361 goto send_reply;
1362 }
1363
1364 /* We've looked in our local zones. If the answer isn't there, we
1365 * might need to bail out based on ACLs now. */
1366 if((ret=deny_refuse_non_local(c, acl, worker, repinfo)) != -1)
1367 {
1368 regional_free_all(worker->scratchpad);
1369 if(ret == 1)
1370 goto send_reply;
1371 return ret;
1372 }
1373
1374 /* If this request does not have the recursion bit set, verify
1375 * ACLs allow the recursion bit to be treated as set. */
1376 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) &&
1377 acl == acl_allow_setrd ) {
1378 LDNS_RD_SET(sldns_buffer_begin(c->buffer));
1379 }
1380
1381 /* If this request does not have the recursion bit set, verify
1382 * ACLs allow the snooping. */
1383 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) &&
1384 acl != acl_allow_snoop ) {
1385 error_encode(c->buffer, LDNS_RCODE_REFUSED, &qinfo,
1386 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1387 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1388 regional_free_all(worker->scratchpad);
1389 log_addr(VERB_ALGO, "refused nonrec (cache snoop) query from",
1390 &repinfo->addr, repinfo->addrlen);
1391 goto send_reply;
1392 }
1393
1394 /* If we've found a local alias, replace the qname with the alias
1395 * target before resolving it. */
1396 if(qinfo.local_alias) {
1397 struct ub_packed_rrset_key* rrset = qinfo.local_alias->rrset;
1398 struct packed_rrset_data* d = rrset->entry.data;
1399
1400 /* Sanity check: our current implementation only supports
1401 * a single CNAME RRset as a local alias. */
1402 if(qinfo.local_alias->next ||
1403 rrset->rk.type != htons(LDNS_RR_TYPE_CNAME) ||
1404 d->count != 1) {
1405 log_err("assumption failure: unexpected local alias");
1406 regional_free_all(worker->scratchpad);
1407 return 0; /* drop it */
1408 }
1409 qinfo.qname = d->rr_data[0] + 2;
1410 qinfo.qname_len = d->rr_len[0] - 2;
1411 }
1412
1413 /* If we may apply IP-based actions to the answer, build the client
1414 * information. As this can be expensive, skip it if there is
1415 * absolutely no possibility of it. */
1416 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) &&
1417 (qinfo.qtype == LDNS_RR_TYPE_A ||
1418 qinfo.qtype == LDNS_RR_TYPE_AAAA ||
1419 qinfo.qtype == LDNS_RR_TYPE_ANY)) {
1420 cinfo_tmp.taglist = acladdr->taglist;
1421 cinfo_tmp.taglen = acladdr->taglen;
1422 cinfo_tmp.tag_actions = acladdr->tag_actions;
1423 cinfo_tmp.tag_actions_size = acladdr->tag_actions_size;
1424 cinfo_tmp.tag_datas = acladdr->tag_datas;
1425 cinfo_tmp.tag_datas_size = acladdr->tag_datas_size;
1426 cinfo_tmp.view = acladdr->view;
1427 cinfo_tmp.respip_set = worker->daemon->respip_set;
1428 cinfo = &cinfo_tmp;
1429 }
1430
1431 lookup_cache:
1432 /* Lookup the cache. In case we chase an intermediate CNAME chain
1433 * this is a two-pass operation, and lookup_qinfo is different for
1434 * each pass. We should still pass the original qinfo to
1435 * answer_from_cache(), however, since it's used to build the reply. */
1436 if(!edns_bypass_cache_stage(edns.opt_list_in, &worker->env)) {
1437 is_expired_answer = 0;
1438 is_secure_answer = 0;
1439 h = query_info_hash(lookup_qinfo, sldns_buffer_read_u16_at(c->buffer, 2));
1440 if((e=slabhash_lookup(worker->env.msg_cache, h, lookup_qinfo, 0))) {
1441 /* answer from cache - we have acquired a readlock on it */
1442 if(answer_from_cache(worker, &qinfo,
1443 cinfo, &need_drop, &is_expired_answer, &is_secure_answer,
1444 &alias_rrset, &partial_rep, (struct reply_info*)e->data,
1445 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1446 sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
1447 &edns)) {
1448 /* prefetch it if the prefetch TTL expired.
1449 * Note that if there is more than one pass
1450 * its qname must be that used for cache
1451 * lookup. */
1452 if((worker->env.cfg->prefetch && *worker->env.now >=
1453 ((struct reply_info*)e->data)->prefetch_ttl) ||
1454 (worker->env.cfg->serve_expired &&
1455 *worker->env.now >= ((struct reply_info*)e->data)->ttl)) {
1456
1457 time_t leeway = ((struct reply_info*)e->
1458 data)->ttl - *worker->env.now;
1459 if(((struct reply_info*)e->data)->ttl
1460 < *worker->env.now)
1461 leeway = 0;
1462 lock_rw_unlock(&e->lock);
1463 reply_and_prefetch(worker, lookup_qinfo,
1464 sldns_buffer_read_u16_at(c->buffer, 2),
1465 repinfo, leeway,
1466 (partial_rep || need_drop));
1467 if(!partial_rep) {
1468 rc = 0;
1469 regional_free_all(worker->scratchpad);
1470 goto send_reply_rc;
1471 }
1472 } else if(!partial_rep) {
1473 lock_rw_unlock(&e->lock);
1474 regional_free_all(worker->scratchpad);
1475 goto send_reply;
1476 } else {
1477 /* Note that we've already released the
1478 * lock if we're here after prefetch. */
1479 lock_rw_unlock(&e->lock);
1480 }
1481 /* We've found a partial reply ending with an
1482 * alias. Replace the lookup qinfo for the
1483 * alias target and lookup the cache again to
1484 * (possibly) complete the reply. As we're
1485 * passing the "base" reply, there will be no
1486 * more alias chasing. */
1487 memset(&qinfo_tmp, 0, sizeof(qinfo_tmp));
1488 get_cname_target(alias_rrset, &qinfo_tmp.qname,
1489 &qinfo_tmp.qname_len);
1490 if(!qinfo_tmp.qname) {
1491 log_err("unexpected: invalid answer alias");
1492 regional_free_all(worker->scratchpad);
1493 return 0; /* drop query */
1494 }
1495 qinfo_tmp.qtype = qinfo.qtype;
1496 qinfo_tmp.qclass = qinfo.qclass;
1497 lookup_qinfo = &qinfo_tmp;
1498 goto lookup_cache;
1499 }
1500 verbose(VERB_ALGO, "answer from the cache failed");
1501 lock_rw_unlock(&e->lock);
1502 }
1503 if(!LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) {
1504 if(answer_norec_from_cache(worker, &qinfo,
1505 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1506 sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
1507 &edns)) {
1508 regional_free_all(worker->scratchpad);
1509 goto send_reply;
1510 }
1511 verbose(VERB_ALGO, "answer norec from cache -- "
1512 "need to validate or not primed");
1513 }
1514 }
1515 sldns_buffer_rewind(c->buffer);
1516 server_stats_querymiss(&worker->stats, worker);
1517
1518 if(verbosity >= VERB_CLIENT) {
1519 if(c->type == comm_udp)
1520 log_addr(VERB_CLIENT, "udp request from",
1521 &repinfo->addr, repinfo->addrlen);
1522 else log_addr(VERB_CLIENT, "tcp request from",
1523 &repinfo->addr, repinfo->addrlen);
1524 }
1525
1526 /* grab a work request structure for this new request */
1527 mesh_new_client(worker->env.mesh, &qinfo, cinfo,
1528 sldns_buffer_read_u16_at(c->buffer, 2),
1529 &edns, repinfo, *(uint16_t*)(void *)sldns_buffer_begin(c->buffer));
1530 regional_free_all(worker->scratchpad);
1531 worker_mem_report(worker, NULL);
1532 return 0;
1533
1534 send_reply:
1535 rc = 1;
1536 send_reply_rc:
1537 if(need_drop) {
1538 comm_point_drop_reply(repinfo);
1539 return 0;
1540 }
1541 if(is_expired_answer) {
1542 worker->stats.ans_expired++;
1543 }
1544 server_stats_insrcode(&worker->stats, c->buffer);
1545 if(worker->stats.extended) {
1546 if(is_secure_answer) worker->stats.ans_secure++;
1547 }
1548 #ifdef USE_DNSTAP
1549 /*
1550 * sending src (client)/dst (local service) addresses over DNSTAP from send_reply code label (when we serviced local zone for ex.)
1551 */
1552 if(worker->dtenv.log_client_response_messages) {
1553 log_addr(VERB_ALGO, "from local addr", (void*)repinfo->c->socket->addr->ai_addr, repinfo->c->socket->addr->ai_addrlen);
1554 log_addr(VERB_ALGO, "response to client", &repinfo->addr, repinfo->addrlen);
1555 dt_msg_send_client_response(&worker->dtenv, &repinfo->addr, (void*)repinfo->c->socket->addr->ai_addr, c->type, c->buffer);
1556 }
1557 #endif
1558 if(worker->env.cfg->log_replies)
1559 {
1560 struct timeval tv;
1561 memset(&tv, 0, sizeof(tv));
1562 if(qinfo.local_alias && qinfo.local_alias->rrset &&
1563 qinfo.local_alias->rrset->rk.dname) {
1564 /* log original qname, before the local alias was
1565 * used to resolve that CNAME to something else */
1566 qinfo.qname = qinfo.local_alias->rrset->rk.dname;
1567 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen,
1568 tv, 1, c->buffer);
1569 } else {
1570 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen,
1571 tv, 1, c->buffer);
1572 }
1573 }
1574 #ifdef USE_DNSCRYPT
1575 if(!dnsc_handle_uncurved_request(repinfo)) {
1576 return 0;
1577 }
1578 #endif
1579 return rc;
1580 }
1581
1582 void
worker_sighandler(int sig,void * arg)1583 worker_sighandler(int sig, void* arg)
1584 {
1585 /* note that log, print, syscalls here give race conditions.
1586 * And cause hangups if the log-lock is held by the application. */
1587 struct worker* worker = (struct worker*)arg;
1588 switch(sig) {
1589 #ifdef SIGHUP
1590 case SIGHUP:
1591 comm_base_exit(worker->base);
1592 break;
1593 #endif
1594 case SIGINT:
1595 worker->need_to_exit = 1;
1596 comm_base_exit(worker->base);
1597 break;
1598 #ifdef SIGQUIT
1599 case SIGQUIT:
1600 worker->need_to_exit = 1;
1601 comm_base_exit(worker->base);
1602 break;
1603 #endif
1604 case SIGTERM:
1605 worker->need_to_exit = 1;
1606 comm_base_exit(worker->base);
1607 break;
1608 default:
1609 /* unknown signal, ignored */
1610 break;
1611 }
1612 }
1613
1614 /** restart statistics timer for worker, if enabled */
1615 static void
worker_restart_timer(struct worker * worker)1616 worker_restart_timer(struct worker* worker)
1617 {
1618 if(worker->env.cfg->stat_interval > 0) {
1619 struct timeval tv;
1620 #ifndef S_SPLINT_S
1621 tv.tv_sec = worker->env.cfg->stat_interval;
1622 tv.tv_usec = 0;
1623 #endif
1624 comm_timer_set(worker->stat_timer, &tv);
1625 }
1626 }
1627
worker_stat_timer_cb(void * arg)1628 void worker_stat_timer_cb(void* arg)
1629 {
1630 struct worker* worker = (struct worker*)arg;
1631 server_stats_log(&worker->stats, worker, worker->thread_num);
1632 mesh_stats(worker->env.mesh, "mesh has");
1633 worker_mem_report(worker, NULL);
1634 /* SHM is enabled, process data to SHM */
1635 if (worker->daemon->cfg->shm_enable) {
1636 shm_main_run(worker);
1637 }
1638 if(!worker->daemon->cfg->stat_cumulative) {
1639 worker_stats_clear(worker);
1640 }
1641 /* start next timer */
1642 worker_restart_timer(worker);
1643 }
1644
worker_probe_timer_cb(void * arg)1645 void worker_probe_timer_cb(void* arg)
1646 {
1647 struct worker* worker = (struct worker*)arg;
1648 struct timeval tv;
1649 #ifndef S_SPLINT_S
1650 tv.tv_sec = (time_t)autr_probe_timer(&worker->env);
1651 tv.tv_usec = 0;
1652 #endif
1653 if(tv.tv_sec != 0)
1654 comm_timer_set(worker->env.probe_timer, &tv);
1655 }
1656
1657 struct worker*
worker_create(struct daemon * daemon,int id,int * ports,int n)1658 worker_create(struct daemon* daemon, int id, int* ports, int n)
1659 {
1660 unsigned int seed;
1661 struct worker* worker = (struct worker*)calloc(1,
1662 sizeof(struct worker));
1663 if(!worker)
1664 return NULL;
1665 worker->numports = n;
1666 worker->ports = (int*)memdup(ports, sizeof(int)*n);
1667 if(!worker->ports) {
1668 free(worker);
1669 return NULL;
1670 }
1671 worker->daemon = daemon;
1672 worker->thread_num = id;
1673 if(!(worker->cmd = tube_create())) {
1674 free(worker->ports);
1675 free(worker);
1676 return NULL;
1677 }
1678 /* create random state here to avoid locking trouble in RAND_bytes */
1679 if(!(worker->rndstate = ub_initstate(daemon->rand))) {
1680 log_err("could not init random numbers.");
1681 tube_delete(worker->cmd);
1682 free(worker->ports);
1683 free(worker);
1684 return NULL;
1685 }
1686 explicit_bzero(&seed, sizeof(seed));
1687 return worker;
1688 }
1689
1690 int
worker_init(struct worker * worker,struct config_file * cfg,struct listen_port * ports,int do_sigs)1691 worker_init(struct worker* worker, struct config_file *cfg,
1692 struct listen_port* ports, int do_sigs)
1693 {
1694 #ifdef USE_DNSTAP
1695 struct dt_env* dtenv = &worker->dtenv;
1696 #else
1697 void* dtenv = NULL;
1698 #endif
1699 worker->need_to_exit = 0;
1700 worker->base = comm_base_create(do_sigs);
1701 if(!worker->base) {
1702 log_err("could not create event handling base");
1703 worker_delete(worker);
1704 return 0;
1705 }
1706 comm_base_set_slow_accept_handlers(worker->base, &worker_stop_accept,
1707 &worker_start_accept, worker);
1708 if(do_sigs) {
1709 #ifdef SIGHUP
1710 ub_thread_sig_unblock(SIGHUP);
1711 #endif
1712 ub_thread_sig_unblock(SIGINT);
1713 #ifdef SIGQUIT
1714 ub_thread_sig_unblock(SIGQUIT);
1715 #endif
1716 ub_thread_sig_unblock(SIGTERM);
1717 #ifndef LIBEVENT_SIGNAL_PROBLEM
1718 worker->comsig = comm_signal_create(worker->base,
1719 worker_sighandler, worker);
1720 if(!worker->comsig
1721 #ifdef SIGHUP
1722 || !comm_signal_bind(worker->comsig, SIGHUP)
1723 #endif
1724 #ifdef SIGQUIT
1725 || !comm_signal_bind(worker->comsig, SIGQUIT)
1726 #endif
1727 || !comm_signal_bind(worker->comsig, SIGTERM)
1728 || !comm_signal_bind(worker->comsig, SIGINT)) {
1729 log_err("could not create signal handlers");
1730 worker_delete(worker);
1731 return 0;
1732 }
1733 #endif /* LIBEVENT_SIGNAL_PROBLEM */
1734 if(!daemon_remote_open_accept(worker->daemon->rc,
1735 worker->daemon->rc_ports, worker)) {
1736 worker_delete(worker);
1737 return 0;
1738 }
1739 #ifdef UB_ON_WINDOWS
1740 wsvc_setup_worker(worker);
1741 #endif /* UB_ON_WINDOWS */
1742 } else { /* !do_sigs */
1743 worker->comsig = NULL;
1744 }
1745 #ifdef USE_DNSTAP
1746 if(cfg->dnstap) {
1747 log_assert(worker->daemon->dtenv != NULL);
1748 memcpy(&worker->dtenv, worker->daemon->dtenv, sizeof(struct dt_env));
1749 if(!dt_init(&worker->dtenv, worker->base))
1750 fatal_exit("dt_init failed");
1751 }
1752 #endif
1753 worker->front = listen_create(worker->base, ports,
1754 cfg->msg_buffer_size, (int)cfg->incoming_num_tcp,
1755 cfg->do_tcp_keepalive
1756 ? cfg->tcp_keepalive_timeout
1757 : cfg->tcp_idle_timeout,
1758 cfg->harden_large_queries, cfg->http_max_streams,
1759 cfg->http_endpoint, cfg->http_notls_downstream,
1760 worker->daemon->tcl, worker->daemon->listen_sslctx,
1761 dtenv, worker_handle_request, worker);
1762 if(!worker->front) {
1763 log_err("could not create listening sockets");
1764 worker_delete(worker);
1765 return 0;
1766 }
1767 worker->back = outside_network_create(worker->base,
1768 cfg->msg_buffer_size, (size_t)cfg->outgoing_num_ports,
1769 cfg->out_ifs, cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6,
1770 cfg->do_tcp?cfg->outgoing_num_tcp:0, cfg->ip_dscp,
1771 worker->daemon->env->infra_cache, worker->rndstate,
1772 cfg->use_caps_bits_for_id, worker->ports, worker->numports,
1773 cfg->unwanted_threshold, cfg->outgoing_tcp_mss,
1774 &worker_alloc_cleanup, worker,
1775 cfg->do_udp || cfg->udp_upstream_without_downstream,
1776 worker->daemon->connect_sslctx, cfg->delay_close,
1777 cfg->tls_use_sni, dtenv, cfg->udp_connect,
1778 cfg->max_reuse_tcp_queries, cfg->tcp_reuse_timeout,
1779 cfg->tcp_auth_query_timeout);
1780 if(!worker->back) {
1781 log_err("could not create outgoing sockets");
1782 worker_delete(worker);
1783 return 0;
1784 }
1785 iterator_set_ip46_support(&worker->daemon->mods, worker->daemon->env,
1786 worker->back);
1787 /* start listening to commands */
1788 if(!tube_setup_bg_listen(worker->cmd, worker->base,
1789 &worker_handle_control_cmd, worker)) {
1790 log_err("could not create control compt.");
1791 worker_delete(worker);
1792 return 0;
1793 }
1794 worker->stat_timer = comm_timer_create(worker->base,
1795 worker_stat_timer_cb, worker);
1796 if(!worker->stat_timer) {
1797 log_err("could not create statistics timer");
1798 }
1799
1800 /* we use the msg_buffer_size as a good estimate for what the
1801 * user wants for memory usage sizes */
1802 worker->scratchpad = regional_create_custom(cfg->msg_buffer_size);
1803 if(!worker->scratchpad) {
1804 log_err("malloc failure");
1805 worker_delete(worker);
1806 return 0;
1807 }
1808
1809 server_stats_init(&worker->stats, cfg);
1810 alloc_init(&worker->alloc, &worker->daemon->superalloc,
1811 worker->thread_num);
1812 alloc_set_id_cleanup(&worker->alloc, &worker_alloc_cleanup, worker);
1813 worker->env = *worker->daemon->env;
1814 comm_base_timept(worker->base, &worker->env.now, &worker->env.now_tv);
1815 worker->env.worker = worker;
1816 worker->env.worker_base = worker->base;
1817 worker->env.send_query = &worker_send_query;
1818 worker->env.alloc = &worker->alloc;
1819 worker->env.outnet = worker->back;
1820 worker->env.rnd = worker->rndstate;
1821 /* If case prefetch is triggered, the corresponding mesh will clear
1822 * the scratchpad for the module env in the middle of request handling.
1823 * It would be prone to a use-after-free kind of bug, so we avoid
1824 * sharing it with worker's own scratchpad at the cost of having
1825 * one more pad per worker. */
1826 worker->env.scratch = regional_create_custom(cfg->msg_buffer_size);
1827 if(!worker->env.scratch) {
1828 log_err("malloc failure");
1829 worker_delete(worker);
1830 return 0;
1831 }
1832 worker->env.mesh = mesh_create(&worker->daemon->mods, &worker->env);
1833 if(!worker->env.mesh) {
1834 log_err("malloc failure");
1835 worker_delete(worker);
1836 return 0;
1837 }
1838 /* Pass on daemon variables that we would need in the mesh area */
1839 worker->env.mesh->use_response_ip = worker->daemon->use_response_ip;
1840 worker->env.mesh->use_rpz = worker->daemon->use_rpz;
1841
1842 worker->env.detach_subs = &mesh_detach_subs;
1843 worker->env.attach_sub = &mesh_attach_sub;
1844 worker->env.add_sub = &mesh_add_sub;
1845 worker->env.kill_sub = &mesh_state_delete;
1846 worker->env.detect_cycle = &mesh_detect_cycle;
1847 worker->env.scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size);
1848 if(!worker->env.scratch_buffer) {
1849 log_err("malloc failure");
1850 worker_delete(worker);
1851 return 0;
1852 }
1853 if(!(worker->env.fwds = forwards_create()) ||
1854 !forwards_apply_cfg(worker->env.fwds, cfg)) {
1855 log_err("Could not set forward zones");
1856 worker_delete(worker);
1857 return 0;
1858 }
1859 if(!(worker->env.hints = hints_create()) ||
1860 !hints_apply_cfg(worker->env.hints, cfg)) {
1861 log_err("Could not set root or stub hints");
1862 worker_delete(worker);
1863 return 0;
1864 }
1865 /* one probe timer per process -- if we have 5011 anchors */
1866 if(autr_get_num_anchors(worker->env.anchors) > 0
1867 #ifndef THREADS_DISABLED
1868 && worker->thread_num == 0
1869 #endif
1870 ) {
1871 struct timeval tv;
1872 tv.tv_sec = 0;
1873 tv.tv_usec = 0;
1874 worker->env.probe_timer = comm_timer_create(worker->base,
1875 worker_probe_timer_cb, worker);
1876 if(!worker->env.probe_timer) {
1877 log_err("could not create 5011-probe timer");
1878 } else {
1879 /* let timer fire, then it can reset itself */
1880 comm_timer_set(worker->env.probe_timer, &tv);
1881 }
1882 }
1883 /* zone transfer tasks, setup once per process, if any */
1884 if(worker->env.auth_zones
1885 #ifndef THREADS_DISABLED
1886 && worker->thread_num == 0
1887 #endif
1888 ) {
1889 auth_xfer_pickup_initial(worker->env.auth_zones, &worker->env);
1890 auth_zones_pickup_zonemd_verify(worker->env.auth_zones,
1891 &worker->env);
1892 }
1893 #ifdef USE_DNSTAP
1894 if(worker->daemon->cfg->dnstap
1895 #ifndef THREADS_DISABLED
1896 && worker->thread_num == 0
1897 #endif
1898 ) {
1899 if(!dt_io_thread_start(dtenv->dtio, comm_base_internal(
1900 worker->base), worker->daemon->num)) {
1901 log_err("could not start dnstap io thread");
1902 worker_delete(worker);
1903 return 0;
1904 }
1905 }
1906 #endif /* USE_DNSTAP */
1907 worker_mem_report(worker, NULL);
1908 /* if statistics enabled start timer */
1909 if(worker->env.cfg->stat_interval > 0) {
1910 verbose(VERB_ALGO, "set statistics interval %d secs",
1911 worker->env.cfg->stat_interval);
1912 worker_restart_timer(worker);
1913 }
1914 return 1;
1915 }
1916
1917 void
worker_work(struct worker * worker)1918 worker_work(struct worker* worker)
1919 {
1920 comm_base_dispatch(worker->base);
1921 }
1922
1923 void
worker_delete(struct worker * worker)1924 worker_delete(struct worker* worker)
1925 {
1926 if(!worker)
1927 return;
1928 if(worker->env.mesh && verbosity >= VERB_OPS) {
1929 server_stats_log(&worker->stats, worker, worker->thread_num);
1930 mesh_stats(worker->env.mesh, "mesh has");
1931 worker_mem_report(worker, NULL);
1932 }
1933 outside_network_quit_prepare(worker->back);
1934 mesh_delete(worker->env.mesh);
1935 sldns_buffer_free(worker->env.scratch_buffer);
1936 forwards_delete(worker->env.fwds);
1937 hints_delete(worker->env.hints);
1938 listen_delete(worker->front);
1939 outside_network_delete(worker->back);
1940 comm_signal_delete(worker->comsig);
1941 tube_delete(worker->cmd);
1942 comm_timer_delete(worker->stat_timer);
1943 comm_timer_delete(worker->env.probe_timer);
1944 free(worker->ports);
1945 if(worker->thread_num == 0) {
1946 #ifdef UB_ON_WINDOWS
1947 wsvc_desetup_worker(worker);
1948 #endif /* UB_ON_WINDOWS */
1949 }
1950 #ifdef USE_DNSTAP
1951 if(worker->daemon->cfg->dnstap
1952 #ifndef THREADS_DISABLED
1953 && worker->thread_num == 0
1954 #endif
1955 ) {
1956 dt_io_thread_stop(worker->dtenv.dtio);
1957 }
1958 dt_deinit(&worker->dtenv);
1959 #endif /* USE_DNSTAP */
1960 comm_base_delete(worker->base);
1961 ub_randfree(worker->rndstate);
1962 alloc_clear(&worker->alloc);
1963 regional_destroy(worker->env.scratch);
1964 regional_destroy(worker->scratchpad);
1965 free(worker);
1966 }
1967
1968 struct outbound_entry*
worker_send_query(struct query_info * qinfo,uint16_t flags,int dnssec,int want_dnssec,int nocaps,struct sockaddr_storage * addr,socklen_t addrlen,uint8_t * zone,size_t zonelen,int tcp_upstream,int ssl_upstream,char * tls_auth_name,struct module_qstate * q)1969 worker_send_query(struct query_info* qinfo, uint16_t flags, int dnssec,
1970 int want_dnssec, int nocaps, struct sockaddr_storage* addr,
1971 socklen_t addrlen, uint8_t* zone, size_t zonelen, int tcp_upstream,
1972 int ssl_upstream, char* tls_auth_name, struct module_qstate* q)
1973 {
1974 struct worker* worker = q->env->worker;
1975 struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
1976 q->region, sizeof(*e));
1977 if(!e)
1978 return NULL;
1979 e->qstate = q;
1980 e->qsent = outnet_serviced_query(worker->back, qinfo, flags, dnssec,
1981 want_dnssec, nocaps, tcp_upstream,
1982 ssl_upstream, tls_auth_name, addr, addrlen, zone, zonelen, q,
1983 worker_handle_service_reply, e, worker->back->udp_buff, q->env);
1984 if(!e->qsent) {
1985 return NULL;
1986 }
1987 return e;
1988 }
1989
1990 void
worker_alloc_cleanup(void * arg)1991 worker_alloc_cleanup(void* arg)
1992 {
1993 struct worker* worker = (struct worker*)arg;
1994 slabhash_clear(&worker->env.rrset_cache->table);
1995 slabhash_clear(worker->env.msg_cache);
1996 }
1997
worker_stats_clear(struct worker * worker)1998 void worker_stats_clear(struct worker* worker)
1999 {
2000 server_stats_init(&worker->stats, worker->env.cfg);
2001 mesh_stats_clear(worker->env.mesh);
2002 worker->back->unwanted_replies = 0;
2003 worker->back->num_tcp_outgoing = 0;
2004 }
2005
worker_start_accept(void * arg)2006 void worker_start_accept(void* arg)
2007 {
2008 struct worker* worker = (struct worker*)arg;
2009 listen_start_accept(worker->front);
2010 if(worker->thread_num == 0)
2011 daemon_remote_start_accept(worker->daemon->rc);
2012 }
2013
worker_stop_accept(void * arg)2014 void worker_stop_accept(void* arg)
2015 {
2016 struct worker* worker = (struct worker*)arg;
2017 listen_stop_accept(worker->front);
2018 if(worker->thread_num == 0)
2019 daemon_remote_stop_accept(worker->daemon->rc);
2020 }
2021
2022 /* --- fake callbacks for fptr_wlist to work --- */
libworker_send_query(struct query_info * ATTR_UNUSED (qinfo),uint16_t ATTR_UNUSED (flags),int ATTR_UNUSED (dnssec),int ATTR_UNUSED (want_dnssec),int ATTR_UNUSED (nocaps),struct sockaddr_storage * ATTR_UNUSED (addr),socklen_t ATTR_UNUSED (addrlen),uint8_t * ATTR_UNUSED (zone),size_t ATTR_UNUSED (zonelen),int ATTR_UNUSED (tcp_upstream),int ATTR_UNUSED (ssl_upstream),char * ATTR_UNUSED (tls_auth_name),struct module_qstate * ATTR_UNUSED (q))2023 struct outbound_entry* libworker_send_query(
2024 struct query_info* ATTR_UNUSED(qinfo),
2025 uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec),
2026 int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps),
2027 struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen),
2028 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream),
2029 int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name),
2030 struct module_qstate* ATTR_UNUSED(q))
2031 {
2032 log_assert(0);
2033 return 0;
2034 }
2035
libworker_handle_service_reply(struct comm_point * ATTR_UNUSED (c),void * ATTR_UNUSED (arg),int ATTR_UNUSED (error),struct comm_reply * ATTR_UNUSED (reply_info))2036 int libworker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
2037 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
2038 struct comm_reply* ATTR_UNUSED(reply_info))
2039 {
2040 log_assert(0);
2041 return 0;
2042 }
2043
libworker_handle_control_cmd(struct tube * ATTR_UNUSED (tube),uint8_t * ATTR_UNUSED (buffer),size_t ATTR_UNUSED (len),int ATTR_UNUSED (error),void * ATTR_UNUSED (arg))2044 void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
2045 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
2046 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
2047 {
2048 log_assert(0);
2049 }
2050
libworker_fg_done_cb(void * ATTR_UNUSED (arg),int ATTR_UNUSED (rcode),sldns_buffer * ATTR_UNUSED (buf),enum sec_status ATTR_UNUSED (s),char * ATTR_UNUSED (why_bogus),int ATTR_UNUSED (was_ratelimited))2051 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2052 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2053 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2054 {
2055 log_assert(0);
2056 }
2057
libworker_bg_done_cb(void * ATTR_UNUSED (arg),int ATTR_UNUSED (rcode),sldns_buffer * ATTR_UNUSED (buf),enum sec_status ATTR_UNUSED (s),char * ATTR_UNUSED (why_bogus),int ATTR_UNUSED (was_ratelimited))2058 void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2059 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2060 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2061 {
2062 log_assert(0);
2063 }
2064
libworker_event_done_cb(void * ATTR_UNUSED (arg),int ATTR_UNUSED (rcode),sldns_buffer * ATTR_UNUSED (buf),enum sec_status ATTR_UNUSED (s),char * ATTR_UNUSED (why_bogus),int ATTR_UNUSED (was_ratelimited))2065 void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2066 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2067 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2068 {
2069 log_assert(0);
2070 }
2071
context_query_cmp(const void * ATTR_UNUSED (a),const void * ATTR_UNUSED (b))2072 int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
2073 {
2074 log_assert(0);
2075 return 0;
2076 }
2077
order_lock_cmp(const void * ATTR_UNUSED (e1),const void * ATTR_UNUSED (e2))2078 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
2079 {
2080 log_assert(0);
2081 return 0;
2082 }
2083
codeline_cmp(const void * ATTR_UNUSED (a),const void * ATTR_UNUSED (b))2084 int codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
2085 {
2086 log_assert(0);
2087 return 0;
2088 }
2089
2090 #ifdef USE_DNSTAP
dtio_tap_callback(int ATTR_UNUSED (fd),short ATTR_UNUSED (ev),void * ATTR_UNUSED (arg))2091 void dtio_tap_callback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev),
2092 void* ATTR_UNUSED(arg))
2093 {
2094 log_assert(0);
2095 }
2096 #endif
2097
2098 #ifdef USE_DNSTAP
dtio_mainfdcallback(int ATTR_UNUSED (fd),short ATTR_UNUSED (ev),void * ATTR_UNUSED (arg))2099 void dtio_mainfdcallback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev),
2100 void* ATTR_UNUSED(arg))
2101 {
2102 log_assert(0);
2103 }
2104 #endif
2105