2 * daemon/worker.c - worker that handles a pending list of requests.
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 implements the worker that handles callbacks on events, for
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 "validator/autotrust.h"
74 #include "validator/val_anchor.h"
75 #include "respip/respip.h"
76 #include "libunbound/context.h"
77 #include "libunbound/libworker.h"
78 #include "sldns/sbuffer.h"
79 #include "sldns/wire2str.h"
80 #include "util/shm_side/shm_main.h"
81 #include "dnscrypt/dnscrypt.h"
82 #include "dnstap/dtstream.h"
84 #ifdef HAVE_SYS_TYPES_H
85 # include <sys/types.h>
92 #include "winrc/win_svc.h"
95 /** Size of an UDP datagram */
96 #define NORMAL_UDP_SIZE 512 /* bytes */
97 /** ratelimit for error responses */
98 #define ERROR_RATELIMIT 100 /* qps */
101 * seconds to add to prefetch leeway. This is a TTL that expires old rrsets
102 * earlier than they should in order to put the new update into the cache.
103 * This additional value is to make sure that if not all TTLs are equal in
104 * the message to be updated(and replaced), that rrsets with up to this much
105 * extra TTL are also replaced. This means that the resulting new message
106 * will have (most likely) this TTL at least, avoiding very small 'split
107 * second' TTLs due to operators choosing relative primes for TTLs (or so).
108 * Also has to be at least one to break ties (and overwrite cached entry).
110 #define PREFETCH_EXPIRY_ADD 60
112 /** Report on memory usage by this thread and global */
114 worker_mem_report(struct worker* ATTR_UNUSED(worker),
115 struct serviced_query* ATTR_UNUSED(cur_serv))
117 #ifdef UNBOUND_ALLOC_STATS
118 /* measure memory leakage */
119 extern size_t unbound_mem_alloc, unbound_mem_freed;
120 /* debug func in validator module */
121 size_t total, front, back, mesh, msg, rrset, infra, ac, superac;
122 size_t me, iter, val, anch;
126 #endif /* CLIENT_SUBNET */
127 if(verbosity < VERB_ALGO)
129 front = listen_get_mem(worker->front);
130 back = outnet_get_mem(worker->back);
131 msg = slabhash_get_mem(worker->env.msg_cache);
132 rrset = slabhash_get_mem(&worker->env.rrset_cache->table);
133 infra = infra_get_mem(worker->env.infra_cache);
134 mesh = mesh_get_mem(worker->env.mesh);
135 ac = alloc_get_mem(&worker->alloc);
136 superac = alloc_get_mem(&worker->daemon->superalloc);
137 anch = anchors_get_mem(worker->env.anchors);
140 for(i=0; i<worker->env.mesh->mods.num; i++) {
141 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
142 mods.mod[i]->get_mem));
143 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
144 val += (*worker->env.mesh->mods.mod[i]->get_mem)
147 else if(strcmp(worker->env.mesh->mods.mod[i]->name,
149 subnet += (*worker->env.mesh->mods.mod[i]->get_mem)
151 #endif /* CLIENT_SUBNET */
152 else iter += (*worker->env.mesh->mods.mod[i]->get_mem)
155 me = sizeof(*worker) + sizeof(*worker->base) + sizeof(*worker->comsig)
156 + comm_point_get_mem(worker->cmd_com)
157 + sizeof(worker->rndstate)
158 + regional_get_mem(worker->scratchpad)
159 + sizeof(*worker->env.scratch_buffer)
160 + sldns_buffer_capacity(worker->env.scratch_buffer)
161 + forwards_get_mem(worker->env.fwds)
162 + hints_get_mem(worker->env.hints);
163 if(worker->thread_num == 0)
164 me += acl_list_get_mem(worker->daemon->acl);
166 me += serviced_get_mem(cur_serv);
168 total = front+back+mesh+msg+rrset+infra+iter+val+ac+superac+me;
171 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u "
172 "rrset=%u infra=%u iter=%u val=%u subnet=%u anchors=%u "
173 "alloccache=%u globalalloccache=%u me=%u",
174 (unsigned)total, (unsigned)front, (unsigned)back,
175 (unsigned)mesh, (unsigned)msg, (unsigned)rrset, (unsigned)infra,
176 (unsigned)iter, (unsigned)val,
177 (unsigned)subnet, (unsigned)anch, (unsigned)ac,
178 (unsigned)superac, (unsigned)me);
179 #else /* no CLIENT_SUBNET */
180 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u "
181 "rrset=%u infra=%u iter=%u val=%u anchors=%u "
182 "alloccache=%u globalalloccache=%u me=%u",
183 (unsigned)total, (unsigned)front, (unsigned)back,
184 (unsigned)mesh, (unsigned)msg, (unsigned)rrset,
185 (unsigned)infra, (unsigned)iter, (unsigned)val, (unsigned)anch,
186 (unsigned)ac, (unsigned)superac, (unsigned)me);
187 #endif /* CLIENT_SUBNET */
188 log_info("Total heap memory estimate: %u total-alloc: %u "
189 "total-free: %u", (unsigned)total,
190 (unsigned)unbound_mem_alloc, (unsigned)unbound_mem_freed);
191 #else /* no UNBOUND_ALLOC_STATS */
195 #endif /* CLIENT_SUBNET */
197 if(verbosity < VERB_QUERY)
199 for(i=0; i<worker->env.mesh->mods.num; i++) {
200 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
201 mods.mod[i]->get_mem));
202 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
203 val += (*worker->env.mesh->mods.mod[i]->get_mem)
206 else if(strcmp(worker->env.mesh->mods.mod[i]->name,
208 subnet += (*worker->env.mesh->mods.mod[i]->get_mem)
210 #endif /* CLIENT_SUBNET */
213 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u "
215 (unsigned)slabhash_get_mem(worker->env.msg_cache),
216 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table),
217 (unsigned)infra_get_mem(worker->env.infra_cache),
218 (unsigned)val, (unsigned)subnet);
219 #else /* no CLIENT_SUBNET */
220 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u",
221 (unsigned)slabhash_get_mem(worker->env.msg_cache),
222 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table),
223 (unsigned)infra_get_mem(worker->env.infra_cache),
225 #endif /* CLIENT_SUBNET */
226 #endif /* UNBOUND_ALLOC_STATS */
230 worker_send_cmd(struct worker* worker, enum worker_commands cmd)
232 uint32_t c = (uint32_t)htonl(cmd);
233 if(!tube_write_msg(worker->cmd, (uint8_t*)&c, sizeof(c), 0)) {
234 log_err("worker send cmd %d failed", (int)cmd);
239 worker_handle_reply(struct comm_point* c, void* arg, int error,
240 struct comm_reply* reply_info)
242 struct module_qstate* q = (struct module_qstate*)arg;
243 struct worker* worker = q->env->worker;
244 struct outbound_entry e;
249 mesh_report_reply(worker->env.mesh, &e, reply_info, error);
250 worker_mem_report(worker, NULL);
254 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
255 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
257 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
258 /* error becomes timeout for the module as if this reply
260 mesh_report_reply(worker->env.mesh, &e, reply_info,
262 worker_mem_report(worker, NULL);
265 mesh_report_reply(worker->env.mesh, &e, reply_info, NETEVENT_NOERROR);
266 worker_mem_report(worker, NULL);
271 worker_handle_service_reply(struct comm_point* c, void* arg, int error,
272 struct comm_reply* reply_info)
274 struct outbound_entry* e = (struct outbound_entry*)arg;
275 struct worker* worker = e->qstate->env->worker;
276 struct serviced_query *sq = e->qsent;
278 verbose(VERB_ALGO, "worker svcd callback for qstate %p", e->qstate);
280 mesh_report_reply(worker->env.mesh, e, reply_info, error);
281 worker_mem_report(worker, sq);
285 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
286 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
288 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
289 /* error becomes timeout for the module as if this reply
291 verbose(VERB_ALGO, "worker: bad reply handled as timeout");
292 mesh_report_reply(worker->env.mesh, e, reply_info,
294 worker_mem_report(worker, sq);
297 mesh_report_reply(worker->env.mesh, e, reply_info, NETEVENT_NOERROR);
298 worker_mem_report(worker, sq);
302 /** ratelimit error replies
303 * @param worker: the worker struct with ratelimit counter
304 * @param err: error code that would be wanted.
305 * @return value of err if okay, or -1 if it should be discarded instead.
308 worker_err_ratelimit(struct worker* worker, int err)
310 if(worker->err_limit_time == *worker->env.now) {
311 /* see if limit is exceeded for this second */
312 if(worker->err_limit_count++ > ERROR_RATELIMIT)
315 /* new second, new limits */
316 worker->err_limit_time = *worker->env.now;
317 worker->err_limit_count = 1;
322 /** check request sanity.
323 * @param pkt: the wire packet to examine for sanity.
324 * @param worker: parameters for checking.
325 * @return error code, 0 OK, or -1 discard.
328 worker_check_request(sldns_buffer* pkt, struct worker* worker)
330 if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) {
331 verbose(VERB_QUERY, "request too short, discarded");
334 if(sldns_buffer_limit(pkt) > NORMAL_UDP_SIZE &&
335 worker->daemon->cfg->harden_large_queries) {
336 verbose(VERB_QUERY, "request too large, discarded");
339 if(LDNS_QR_WIRE(sldns_buffer_begin(pkt))) {
340 verbose(VERB_QUERY, "request has QR bit on, discarded");
343 if(LDNS_TC_WIRE(sldns_buffer_begin(pkt))) {
344 LDNS_TC_CLR(sldns_buffer_begin(pkt));
345 verbose(VERB_QUERY, "request bad, has TC bit on");
346 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
348 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY &&
349 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY) {
350 verbose(VERB_QUERY, "request unknown opcode %d",
351 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)));
352 return worker_err_ratelimit(worker, LDNS_RCODE_NOTIMPL);
354 if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1) {
355 verbose(VERB_QUERY, "request wrong nr qd=%d",
356 LDNS_QDCOUNT(sldns_buffer_begin(pkt)));
357 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
359 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 0 &&
360 (LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 1 ||
361 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY)) {
362 verbose(VERB_QUERY, "request wrong nr an=%d",
363 LDNS_ANCOUNT(sldns_buffer_begin(pkt)));
364 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
366 if(LDNS_NSCOUNT(sldns_buffer_begin(pkt)) != 0) {
367 verbose(VERB_QUERY, "request wrong nr ns=%d",
368 LDNS_NSCOUNT(sldns_buffer_begin(pkt)));
369 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
371 if(LDNS_ARCOUNT(sldns_buffer_begin(pkt)) > 1) {
372 verbose(VERB_QUERY, "request wrong nr ar=%d",
373 LDNS_ARCOUNT(sldns_buffer_begin(pkt)));
374 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
380 worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), uint8_t* msg,
381 size_t len, int error, void* arg)
383 struct worker* worker = (struct worker*)arg;
384 enum worker_commands cmd;
385 if(error != NETEVENT_NOERROR) {
387 if(error == NETEVENT_CLOSED)
388 comm_base_exit(worker->base);
389 else log_info("control event: %d", error);
392 if(len != sizeof(uint32_t)) {
393 fatal_exit("bad control msg length %d", (int)len);
395 cmd = sldns_read_uint32(msg);
398 case worker_cmd_quit:
399 verbose(VERB_ALGO, "got control cmd quit");
400 comm_base_exit(worker->base);
402 case worker_cmd_stats:
403 verbose(VERB_ALGO, "got control cmd stats");
404 server_stats_reply(worker, 1);
406 case worker_cmd_stats_noreset:
407 verbose(VERB_ALGO, "got control cmd stats_noreset");
408 server_stats_reply(worker, 0);
410 case worker_cmd_remote:
411 verbose(VERB_ALGO, "got control cmd remote");
412 daemon_remote_exec(worker);
415 log_err("bad command %d", (int)cmd);
420 /** check if a delegation is secure */
421 static enum sec_status
422 check_delegation_secure(struct reply_info *rep)
424 /* return smallest security status */
426 enum sec_status sec = sec_status_secure;
428 size_t num = rep->an_numrrsets + rep->ns_numrrsets;
429 /* check if answer and authority are OK */
430 for(i=0; i<num; i++) {
431 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
436 /* in additional, only unchecked triggers revalidation */
437 for(i=num; i<rep->rrset_count; i++) {
438 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
440 if(s == sec_status_unchecked)
446 /** remove nonsecure from a delegation referral additional section */
448 deleg_remove_nonsecure_additional(struct reply_info* rep)
450 /* we can simply edit it, since we are working in the scratch region */
454 for(i = rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
455 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
457 if(s != sec_status_secure) {
458 memmove(rep->rrsets+i, rep->rrsets+i+1,
459 sizeof(struct ub_packed_rrset_key*)*
460 (rep->rrset_count - i - 1));
468 /** answer nonrecursive query from the cache */
470 answer_norec_from_cache(struct worker* worker, struct query_info* qinfo,
471 uint16_t id, uint16_t flags, struct comm_reply* repinfo,
472 struct edns_data* edns)
474 /* for a nonrecursive query return either:
475 * o an error (servfail; we try to avoid this)
476 * o a delegation (closest we have; this routine tries that)
477 * o the answer (checked by answer_from_cache)
479 * So, grab a delegation from the rrset cache.
480 * Then check if it needs validation, if so, this routine fails,
481 * so that iterator can prime and validator can verify rrsets.
483 struct edns_data edns_bak;
484 uint16_t udpsize = edns->udp_size;
486 time_t timenow = *worker->env.now;
487 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
488 && worker->env.need_to_validate;
489 struct dns_msg *msg = NULL;
492 dp = dns_cache_find_delegation(&worker->env, qinfo->qname,
493 qinfo->qname_len, qinfo->qtype, qinfo->qclass,
494 worker->scratchpad, &msg, timenow);
495 if(!dp) { /* no delegation, need to reprime */
498 /* In case we have a local alias, copy it into the delegation message.
499 * Shallow copy should be fine, as we'll be done with msg in this
501 msg->qinfo.local_alias = qinfo->local_alias;
503 switch(check_delegation_secure(msg->rep)) {
504 case sec_status_unchecked:
505 /* some rrsets have not been verified yet, go and
506 * let validator do that */
508 case sec_status_bogus:
509 case sec_status_secure_sentinel_fail:
510 /* some rrsets are bogus, reply servfail */
511 edns->edns_version = EDNS_ADVERTISED_VERSION;
512 edns->udp_size = EDNS_ADVERTISED_SIZE;
514 edns->bits &= EDNS_DO;
515 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL,
516 msg->rep, LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
518 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
519 &msg->qinfo, id, flags, edns);
520 if(worker->stats.extended) {
521 worker->stats.ans_bogus++;
522 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL]++;
525 case sec_status_secure:
526 /* all rrsets are secure */
527 /* remove non-secure rrsets from the add. section*/
528 if(worker->env.cfg->val_clean_additional)
529 deleg_remove_nonsecure_additional(msg->rep);
532 case sec_status_indeterminate:
533 case sec_status_insecure:
540 /* return this delegation from the cache */
542 edns->edns_version = EDNS_ADVERTISED_VERSION;
543 edns->udp_size = EDNS_ADVERTISED_SIZE;
545 edns->bits &= EDNS_DO;
546 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, msg->rep,
547 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad))
549 msg->rep->flags |= BIT_QR|BIT_RA;
550 if(!apply_edns_options(edns, &edns_bak, worker->env.cfg,
551 repinfo->c, worker->scratchpad) ||
552 !reply_info_answer_encode(&msg->qinfo, msg->rep, id, flags,
553 repinfo->c->buffer, 0, 1, worker->scratchpad,
554 udpsize, edns, (int)(edns->bits & EDNS_DO), secure)) {
555 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL,
556 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
557 edns->opt_list = NULL;
558 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
559 &msg->qinfo, id, flags, edns);
561 if(worker->stats.extended) {
562 if(secure) worker->stats.ans_secure++;
563 server_stats_insrcode(&worker->stats, repinfo->c->buffer);
568 /** Apply, if applicable, a response IP action to a cached answer.
569 * If the answer is rewritten as a result of an action, '*encode_repp' will
570 * point to the reply info containing the modified answer. '*encode_repp' will
571 * be intact otherwise.
572 * It returns 1 on success, 0 otherwise. */
574 apply_respip_action(struct worker* worker, const struct query_info* qinfo,
575 struct respip_client_info* cinfo, struct reply_info* rep,
576 struct comm_reply* repinfo, struct ub_packed_rrset_key** alias_rrset,
577 struct reply_info** encode_repp, struct auth_zones* az)
579 struct respip_action_info actinfo = {0};
580 actinfo.action = respip_none;
582 if(qinfo->qtype != LDNS_RR_TYPE_A &&
583 qinfo->qtype != LDNS_RR_TYPE_AAAA &&
584 qinfo->qtype != LDNS_RR_TYPE_ANY)
587 if(!respip_rewrite_reply(qinfo, cinfo, rep, encode_repp, &actinfo,
588 alias_rrset, 0, worker->scratchpad, az))
591 /* xxx_deny actions mean dropping the reply, unless the original reply
592 * was redirected to response-ip data. */
593 if((actinfo.action == respip_deny ||
594 actinfo.action == respip_inform_deny) &&
598 /* If address info is returned, it means the action should be an
599 * 'inform' variant and the information should be logged. */
600 if(actinfo.addrinfo) {
601 respip_inform_print(&actinfo, qinfo->qname,
602 qinfo->qtype, qinfo->qclass, qinfo->local_alias,
605 if(worker->stats.extended && actinfo.rpz_used) {
606 if(actinfo.rpz_disabled)
607 worker->stats.rpz_action[RPZ_DISABLED_ACTION]++;
608 if(actinfo.rpz_cname_override)
609 worker->stats.rpz_action[RPZ_CNAME_OVERRIDE_ACTION]++;
611 worker->stats.rpz_action[
612 respip_action_to_rpz_action(actinfo.action)]++;
619 /** answer query from the cache.
620 * Normally, the answer message will be built in repinfo->c->buffer; if the
621 * answer is supposed to be suppressed or the answer is supposed to be an
622 * incomplete CNAME chain, the buffer is explicitly cleared to signal the
623 * caller as such. In the latter case *partial_rep will point to the incomplete
624 * reply, and this function is (possibly) supposed to be called again with that
625 * *partial_rep value to complete the chain. In addition, if the query should
626 * be completely dropped, '*need_drop' will be set to 1. */
628 answer_from_cache(struct worker* worker, struct query_info* qinfo,
629 struct respip_client_info* cinfo, int* need_drop, int* is_expired_answer,
630 int* is_secure_answer, struct ub_packed_rrset_key** alias_rrset,
631 struct reply_info** partial_repp,
632 struct reply_info* rep, uint16_t id, uint16_t flags,
633 struct comm_reply* repinfo, struct edns_data* edns)
635 struct edns_data edns_bak;
636 time_t timenow = *worker->env.now;
637 uint16_t udpsize = edns->udp_size;
638 struct reply_info* encode_rep = rep;
639 struct reply_info* partial_rep = *partial_repp;
640 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
641 && worker->env.need_to_validate;
642 *partial_repp = NULL; /* avoid accidental further pass */
645 if(rep->ttl < timenow) {
646 /* Check if we need to serve expired now */
647 if(worker->env.cfg->serve_expired &&
648 !worker->env.cfg->serve_expired_client_timeout) {
649 if(worker->env.cfg->serve_expired_ttl &&
650 rep->serve_expired_ttl < timenow)
652 if(!rrset_array_lock(rep->ref, rep->rrset_count, 0))
654 *is_expired_answer = 1;
656 /* the rrsets may have been updated in the meantime.
657 * we will refetch the message format from the
658 * authoritative server
663 if(!rrset_array_lock(rep->ref, rep->rrset_count, timenow))
666 /* locked and ids and ttls are OK. */
668 /* check CNAME chain (if any) */
669 if(rep->an_numrrsets > 0 && (rep->rrsets[0]->rk.type ==
670 htons(LDNS_RR_TYPE_CNAME) || rep->rrsets[0]->rk.type ==
671 htons(LDNS_RR_TYPE_DNAME))) {
672 if(!reply_check_cname_chain(qinfo, rep)) {
673 /* cname chain invalid, redo iterator steps */
674 verbose(VERB_ALGO, "Cache reply: cname chain broken");
678 /* check security status of the cached answer */
679 if(must_validate && (rep->security == sec_status_bogus ||
680 rep->security == sec_status_secure_sentinel_fail)) {
682 edns->edns_version = EDNS_ADVERTISED_VERSION;
683 edns->udp_size = EDNS_ADVERTISED_SIZE;
685 edns->bits &= EDNS_DO;
686 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, rep,
687 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
689 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
690 qinfo, id, flags, edns);
691 rrset_array_unlock_touch(worker->env.rrset_cache,
692 worker->scratchpad, rep->ref, rep->rrset_count);
693 if(worker->stats.extended) {
694 worker->stats.ans_bogus ++;
695 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL] ++;
698 } else if(rep->security == sec_status_unchecked && must_validate) {
699 verbose(VERB_ALGO, "Cache reply: unchecked entry needs "
701 goto bail_out; /* need to validate cache entry first */
702 } else if(rep->security == sec_status_secure) {
703 if(reply_all_rrsets_secure(rep)) {
704 *is_secure_answer = 1;
707 verbose(VERB_ALGO, "Cache reply: secure entry"
709 goto bail_out; /* rrset changed, re-verify */
711 *is_secure_answer = 0;
713 } else *is_secure_answer = 0;
716 edns->edns_version = EDNS_ADVERTISED_VERSION;
717 edns->udp_size = EDNS_ADVERTISED_SIZE;
719 edns->bits &= EDNS_DO;
720 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, rep,
721 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad))
723 *alias_rrset = NULL; /* avoid confusion if caller set it to non-NULL */
724 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) &&
725 !partial_rep && !apply_respip_action(worker, qinfo, cinfo, rep,
726 repinfo, alias_rrset,
727 &encode_rep, worker->env.auth_zones)) {
729 } else if(partial_rep &&
730 !respip_merge_cname(partial_rep, qinfo, rep, cinfo,
731 must_validate, &encode_rep, worker->scratchpad,
732 worker->env.auth_zones)) {
735 if(encode_rep != rep) {
736 /* if rewritten, it can't be considered "secure" */
737 *is_secure_answer = 0;
739 if(!encode_rep || *alias_rrset) {
743 /* If a partial CNAME chain is found, we first need to
744 * make a copy of the reply in the scratchpad so we
745 * can release the locks and lookup the cache again. */
746 *partial_repp = reply_info_copy(encode_rep, NULL,
751 } else if(!apply_edns_options(edns, &edns_bak, worker->env.cfg,
752 repinfo->c, worker->scratchpad) ||
753 !reply_info_answer_encode(qinfo, encode_rep, id, flags,
754 repinfo->c->buffer, timenow, 1, worker->scratchpad,
755 udpsize, edns, (int)(edns->bits & EDNS_DO), *is_secure_answer)) {
756 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL,
757 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
758 edns->opt_list = NULL;
759 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
760 qinfo, id, flags, edns);
762 /* cannot send the reply right now, because blocking network syscall
763 * is bad while holding locks. */
764 rrset_array_unlock_touch(worker->env.rrset_cache, worker->scratchpad,
765 rep->ref, rep->rrset_count);
766 /* go and return this buffer to the client */
770 rrset_array_unlock_touch(worker->env.rrset_cache,
771 worker->scratchpad, rep->ref, rep->rrset_count);
775 /** Reply to client and perform prefetch to keep cache up to date. */
777 reply_and_prefetch(struct worker* worker, struct query_info* qinfo,
778 uint16_t flags, struct comm_reply* repinfo, time_t leeway, int noreply)
780 /* first send answer to client to keep its latency
781 * as small as a cachereply */
783 if(repinfo->c->tcp_req_info) {
785 repinfo->c->tcp_req_info->spool_buffer,
788 comm_point_send_reply(repinfo);
790 server_stats_prefetch(&worker->stats, worker);
792 /* create the prefetch in the mesh as a normal lookup without
793 * client addrs waiting, which has the cache blacklisted (to bypass
794 * the cache and go to the network for the data). */
795 /* this (potentially) runs the mesh for the new query */
796 mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway +
797 PREFETCH_EXPIRY_ADD);
801 * Fill CH class answer into buffer. Keeps query.
803 * @param str: string to put into text record (<255).
804 * array of strings, every string becomes a text record.
805 * @param num: number of strings in array.
806 * @param edns: edns reply information.
807 * @param worker: worker with scratch region.
808 * @param repinfo: reply information for a communication point.
811 chaos_replystr(sldns_buffer* pkt, char** str, int num, struct edns_data* edns,
812 struct worker* worker, struct comm_reply* repinfo)
815 unsigned int rd = LDNS_RD_WIRE(sldns_buffer_begin(pkt));
816 unsigned int cd = LDNS_CD_WIRE(sldns_buffer_begin(pkt));
817 sldns_buffer_clear(pkt);
818 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip id */
819 sldns_buffer_write_u16(pkt, (uint16_t)(BIT_QR|BIT_RA));
820 if(rd) LDNS_RD_SET(sldns_buffer_begin(pkt));
821 if(cd) LDNS_CD_SET(sldns_buffer_begin(pkt));
822 sldns_buffer_write_u16(pkt, 1); /* qdcount */
823 sldns_buffer_write_u16(pkt, (uint16_t)num); /* ancount */
824 sldns_buffer_write_u16(pkt, 0); /* nscount */
825 sldns_buffer_write_u16(pkt, 0); /* arcount */
826 (void)query_dname_len(pkt); /* skip qname */
827 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qtype */
828 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qclass */
829 for(i=0; i<num; i++) {
830 size_t len = strlen(str[i]);
831 if(len>255) len=255; /* cap size of TXT record */
832 sldns_buffer_write_u16(pkt, 0xc00c); /* compr ptr to query */
833 sldns_buffer_write_u16(pkt, LDNS_RR_TYPE_TXT);
834 sldns_buffer_write_u16(pkt, LDNS_RR_CLASS_CH);
835 sldns_buffer_write_u32(pkt, 0); /* TTL */
836 sldns_buffer_write_u16(pkt, sizeof(uint8_t) + len);
837 sldns_buffer_write_u8(pkt, len);
838 sldns_buffer_write(pkt, str[i], len);
840 sldns_buffer_flip(pkt);
841 edns->edns_version = EDNS_ADVERTISED_VERSION;
842 edns->udp_size = EDNS_ADVERTISED_SIZE;
843 edns->bits &= EDNS_DO;
844 if(!inplace_cb_reply_local_call(&worker->env, NULL, NULL, NULL,
845 LDNS_RCODE_NOERROR, edns, repinfo, worker->scratchpad))
846 edns->opt_list = NULL;
847 if(sldns_buffer_capacity(pkt) >=
848 sldns_buffer_limit(pkt)+calc_edns_field_size(edns))
849 attach_edns_record(pkt, edns);
852 /** Reply with one string */
854 chaos_replyonestr(sldns_buffer* pkt, const char* str, struct edns_data* edns,
855 struct worker* worker, struct comm_reply* repinfo)
857 chaos_replystr(pkt, (char**)&str, 1, edns, worker, repinfo);
861 * Create CH class trustanchor answer.
863 * @param edns: edns reply information.
864 * @param w: worker with scratch region.
865 * @param repinfo: reply information for a communication point.
868 chaos_trustanchor(sldns_buffer* pkt, struct edns_data* edns, struct worker* w,
869 struct comm_reply* repinfo)
871 #define TA_RESPONSE_MAX_TXT 16 /* max number of TXT records */
872 #define TA_RESPONSE_MAX_TAGS 32 /* max number of tags printed per zone */
873 char* str_array[TA_RESPONSE_MAX_TXT];
874 uint16_t tags[TA_RESPONSE_MAX_TAGS];
876 struct trust_anchor* ta;
878 if(!w->env.need_to_validate) {
879 /* no validator module, reply no trustanchors */
880 chaos_replystr(pkt, NULL, 0, edns, w, repinfo);
884 /* fill the string with contents */
885 lock_basic_lock(&w->env.anchors->lock);
886 RBTREE_FOR(ta, struct trust_anchor*, w->env.anchors->tree) {
888 size_t i, numtag, str_len = 255;
889 if(num == TA_RESPONSE_MAX_TXT) continue;
890 str = (char*)regional_alloc(w->scratchpad, str_len);
892 lock_basic_lock(&ta->lock);
893 numtag = anchor_list_keytags(ta, tags, TA_RESPONSE_MAX_TAGS);
895 /* empty, insecure point */
896 lock_basic_unlock(&ta->lock);
899 str_array[num] = str;
902 /* spool name of anchor */
903 (void)sldns_wire2str_dname_buf(ta->name, ta->namelen, str, str_len);
904 str_len -= strlen(str); str += strlen(str);
906 for(i=0; i<numtag; i++) {
907 snprintf(str, str_len, " %u", (unsigned)tags[i]);
908 str_len -= strlen(str); str += strlen(str);
910 lock_basic_unlock(&ta->lock);
912 lock_basic_unlock(&w->env.anchors->lock);
914 chaos_replystr(pkt, str_array, num, edns, w, repinfo);
915 regional_free_all(w->scratchpad);
919 * Answer CH class queries.
921 * @param qinfo: query info. Pointer into packet buffer.
922 * @param edns: edns info from query.
923 * @param repinfo: reply information for a communication point.
924 * @param pkt: packet buffer.
925 * @return: true if a reply is to be sent.
928 answer_chaos(struct worker* w, struct query_info* qinfo,
929 struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* pkt)
931 struct config_file* cfg = w->env.cfg;
932 if(qinfo->qtype != LDNS_RR_TYPE_ANY && qinfo->qtype != LDNS_RR_TYPE_TXT)
934 if(query_dname_compare(qinfo->qname,
935 (uint8_t*)"\002id\006server") == 0 ||
936 query_dname_compare(qinfo->qname,
937 (uint8_t*)"\010hostname\004bind") == 0)
939 if(cfg->hide_identity)
941 if(cfg->identity==NULL || cfg->identity[0]==0) {
942 char buf[MAXHOSTNAMELEN+1];
943 if (gethostname(buf, MAXHOSTNAMELEN) == 0) {
944 buf[MAXHOSTNAMELEN] = 0;
945 chaos_replyonestr(pkt, buf, edns, w, repinfo);
947 log_err("gethostname: %s", strerror(errno));
948 chaos_replyonestr(pkt, "no hostname", edns, w, repinfo);
951 else chaos_replyonestr(pkt, cfg->identity, edns, w, repinfo);
954 if(query_dname_compare(qinfo->qname,
955 (uint8_t*)"\007version\006server") == 0 ||
956 query_dname_compare(qinfo->qname,
957 (uint8_t*)"\007version\004bind") == 0)
959 if(cfg->hide_version)
961 if(cfg->version==NULL || cfg->version[0]==0)
962 chaos_replyonestr(pkt, PACKAGE_STRING, edns, w, repinfo);
963 else chaos_replyonestr(pkt, cfg->version, edns, w, repinfo);
966 if(query_dname_compare(qinfo->qname,
967 (uint8_t*)"\013trustanchor\007unbound") == 0)
969 if(cfg->hide_trustanchor)
971 chaos_trustanchor(pkt, edns, w, repinfo);
979 * Answer notify queries. These are notifies for authoritative zones,
980 * the reply is an ack that the notify has been received. We need to check
981 * access permission here.
983 * @param qinfo: query info. Pointer into packet buffer.
984 * @param edns: edns info from query.
985 * @param repinfo: reply info with source address.
986 * @param pkt: packet buffer.
989 answer_notify(struct worker* w, struct query_info* qinfo,
990 struct edns_data* edns, sldns_buffer* pkt, struct comm_reply* repinfo)
993 int rcode = LDNS_RCODE_NOERROR;
996 if(!w->env.auth_zones) return;
997 has_serial = auth_zone_parse_notify_serial(pkt, &serial);
998 if(auth_zones_notify(w->env.auth_zones, &w->env, qinfo->qname,
999 qinfo->qname_len, qinfo->qclass, &repinfo->addr,
1000 repinfo->addrlen, has_serial, serial, &refused)) {
1001 rcode = LDNS_RCODE_NOERROR;
1004 rcode = LDNS_RCODE_REFUSED;
1005 else rcode = LDNS_RCODE_SERVFAIL;
1008 if(verbosity >= VERB_DETAIL) {
1012 dname_str(qinfo->qname, zname);
1015 snprintf(sr, sizeof(sr), "serial %u ",
1017 if(rcode == LDNS_RCODE_REFUSED)
1018 snprintf(buf, sizeof(buf),
1019 "refused NOTIFY %sfor %s from", sr, zname);
1020 else if(rcode == LDNS_RCODE_SERVFAIL)
1021 snprintf(buf, sizeof(buf),
1022 "servfail for NOTIFY %sfor %s from", sr, zname);
1023 else snprintf(buf, sizeof(buf),
1024 "received NOTIFY %sfor %s from", sr, zname);
1025 log_addr(VERB_DETAIL, buf, &repinfo->addr, repinfo->addrlen);
1027 edns->edns_version = EDNS_ADVERTISED_VERSION;
1028 edns->udp_size = EDNS_ADVERTISED_SIZE;
1029 edns->ext_rcode = 0;
1030 edns->bits &= EDNS_DO;
1031 edns->opt_list = NULL;
1032 error_encode(pkt, rcode, qinfo,
1033 *(uint16_t*)(void *)sldns_buffer_begin(pkt),
1034 sldns_buffer_read_u16_at(pkt, 2), edns);
1035 LDNS_OPCODE_SET(sldns_buffer_begin(pkt), LDNS_PACKET_NOTIFY);
1039 deny_refuse(struct comm_point* c, enum acl_access acl,
1040 enum acl_access deny, enum acl_access refuse,
1041 struct worker* worker, struct comm_reply* repinfo)
1044 comm_point_drop_reply(repinfo);
1045 if(worker->stats.extended)
1046 worker->stats.unwanted_queries++;
1048 } else if(acl == refuse) {
1049 log_addr(VERB_ALGO, "refused query from",
1050 &repinfo->addr, repinfo->addrlen);
1051 log_buf(VERB_ALGO, "refuse", c->buffer);
1052 if(worker->stats.extended)
1053 worker->stats.unwanted_queries++;
1054 if(worker_check_request(c->buffer, worker) == -1) {
1055 comm_point_drop_reply(repinfo);
1056 return 0; /* discard this */
1058 sldns_buffer_set_limit(c->buffer, LDNS_HEADER_SIZE);
1059 sldns_buffer_write_at(c->buffer, 4,
1060 (uint8_t*)"\0\0\0\0\0\0\0\0", 8);
1061 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1062 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1063 LDNS_RCODE_REFUSED);
1064 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE);
1065 sldns_buffer_flip(c->buffer);
1073 deny_refuse_all(struct comm_point* c, enum acl_access acl,
1074 struct worker* worker, struct comm_reply* repinfo)
1076 return deny_refuse(c, acl, acl_deny, acl_refuse, worker, repinfo);
1080 deny_refuse_non_local(struct comm_point* c, enum acl_access acl,
1081 struct worker* worker, struct comm_reply* repinfo)
1083 return deny_refuse(c, acl, acl_deny_non_local, acl_refuse_non_local, worker, repinfo);
1087 worker_handle_request(struct comm_point* c, void* arg, int error,
1088 struct comm_reply* repinfo)
1090 struct worker* worker = (struct worker*)arg;
1093 struct lruhash_entry* e;
1094 struct query_info qinfo;
1095 struct edns_data edns;
1096 enum acl_access acl;
1097 struct acl_addr* acladdr;
1100 int is_expired_answer = 0;
1101 int is_secure_answer = 0;
1102 /* We might have to chase a CNAME chain internally, in which case
1103 * we'll have up to two replies and combine them to build a complete
1104 * answer. These variables control this case. */
1105 struct ub_packed_rrset_key* alias_rrset = NULL;
1106 struct reply_info* partial_rep = NULL;
1107 struct query_info* lookup_qinfo = &qinfo;
1108 struct query_info qinfo_tmp; /* placeholder for lookup_qinfo */
1109 struct respip_client_info* cinfo = NULL, cinfo_tmp;
1110 memset(&qinfo, 0, sizeof(qinfo));
1112 if(error != NETEVENT_NOERROR || !repinfo) {
1113 /* some bad tcp query DNS formats give these error calls */
1114 verbose(VERB_ALGO, "handle request called with err=%d", error);
1118 repinfo->max_udp_size = worker->daemon->cfg->max_udp_size;
1119 if(!dnsc_handle_curved_request(worker->daemon->dnscenv, repinfo)) {
1120 worker->stats.num_query_dnscrypt_crypted_malformed++;
1123 if(c->dnscrypt && !repinfo->is_dnscrypted) {
1124 char buf[LDNS_MAX_DOMAINLEN+1];
1125 /* Check if this is unencrypted and asking for certs */
1126 if(worker_check_request(c->buffer, worker) != 0) {
1128 "dnscrypt: worker check request: bad query.");
1129 log_addr(VERB_CLIENT,"from",&repinfo->addr,
1131 comm_point_drop_reply(repinfo);
1134 if(!query_info_parse(&qinfo, c->buffer)) {
1136 "dnscrypt: worker parse request: formerror.");
1137 log_addr(VERB_CLIENT, "from", &repinfo->addr,
1139 comm_point_drop_reply(repinfo);
1142 dname_str(qinfo.qname, buf);
1143 if(!(qinfo.qtype == LDNS_RR_TYPE_TXT &&
1145 worker->daemon->dnscenv->provider_name) == 0)) {
1147 "dnscrypt: not TXT \"%s\". Received: %s \"%s\"",
1148 worker->daemon->dnscenv->provider_name,
1149 sldns_rr_descript(qinfo.qtype)->_name,
1151 comm_point_drop_reply(repinfo);
1152 worker->stats.num_query_dnscrypt_cleartext++;
1155 worker->stats.num_query_dnscrypt_cert++;
1156 sldns_buffer_rewind(c->buffer);
1157 } else if(c->dnscrypt && repinfo->is_dnscrypted) {
1158 worker->stats.num_query_dnscrypt_crypted++;
1162 if(worker->dtenv.log_client_query_messages)
1163 dt_msg_send_client_query(&worker->dtenv, &repinfo->addr, c->type,
1166 acladdr = acl_addr_lookup(worker->daemon->acl, &repinfo->addr,
1168 acl = acl_get_control(acladdr);
1169 if((ret=deny_refuse_all(c, acl, worker, repinfo)) != -1)
1175 if((ret=worker_check_request(c->buffer, worker)) != 0) {
1176 verbose(VERB_ALGO, "worker check request: bad query.");
1177 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1179 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1180 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
1183 comm_point_drop_reply(repinfo);
1187 worker->stats.num_queries++;
1189 /* check if this query should be dropped based on source ip rate limiting */
1190 if(!infra_ip_ratelimit_inc(worker->env.infra_cache, repinfo,
1191 *worker->env.now, c->buffer)) {
1192 /* See if we are passed through with slip factor */
1193 if(worker->env.cfg->ip_ratelimit_factor != 0 &&
1194 ub_random_max(worker->env.rnd,
1195 worker->env.cfg->ip_ratelimit_factor) == 0) {
1198 addr_to_str(&repinfo->addr, repinfo->addrlen,
1199 addrbuf, sizeof(addrbuf));
1200 verbose(VERB_QUERY, "ip_ratelimit allowed through for ip address %s because of slip in ip_ratelimit_factor",
1203 worker->stats.num_queries_ip_ratelimited++;
1204 comm_point_drop_reply(repinfo);
1209 /* see if query is in the cache */
1210 if(!query_info_parse(&qinfo, c->buffer)) {
1211 verbose(VERB_ALGO, "worker parse request: formerror.");
1212 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1213 memset(&qinfo, 0, sizeof(qinfo)); /* zero qinfo.qname */
1214 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) {
1215 comm_point_drop_reply(repinfo);
1218 sldns_buffer_rewind(c->buffer);
1219 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1220 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1221 LDNS_RCODE_FORMERR);
1222 server_stats_insrcode(&worker->stats, c->buffer);
1225 if(worker->env.cfg->log_queries) {
1227 addr_to_str(&repinfo->addr, repinfo->addrlen, ip, sizeof(ip));
1228 log_query_in(ip, qinfo.qname, qinfo.qtype, qinfo.qclass);
1230 if(qinfo.qtype == LDNS_RR_TYPE_AXFR ||
1231 qinfo.qtype == LDNS_RR_TYPE_IXFR) {
1232 verbose(VERB_ALGO, "worker request: refused zone transfer.");
1233 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1234 sldns_buffer_rewind(c->buffer);
1235 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1236 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1237 LDNS_RCODE_REFUSED);
1238 if(worker->stats.extended) {
1239 worker->stats.qtype[qinfo.qtype]++;
1240 server_stats_insrcode(&worker->stats, c->buffer);
1244 if(qinfo.qtype == LDNS_RR_TYPE_OPT ||
1245 qinfo.qtype == LDNS_RR_TYPE_TSIG ||
1246 qinfo.qtype == LDNS_RR_TYPE_TKEY ||
1247 qinfo.qtype == LDNS_RR_TYPE_MAILA ||
1248 qinfo.qtype == LDNS_RR_TYPE_MAILB ||
1249 (qinfo.qtype >= 128 && qinfo.qtype <= 248)) {
1250 verbose(VERB_ALGO, "worker request: formerror for meta-type.");
1251 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1252 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) {
1253 comm_point_drop_reply(repinfo);
1256 sldns_buffer_rewind(c->buffer);
1257 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1258 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1259 LDNS_RCODE_FORMERR);
1260 if(worker->stats.extended) {
1261 worker->stats.qtype[qinfo.qtype]++;
1262 server_stats_insrcode(&worker->stats, c->buffer);
1266 if((ret=parse_edns_from_pkt(c->buffer, &edns, worker->scratchpad)) != 0) {
1267 struct edns_data reply_edns;
1268 verbose(VERB_ALGO, "worker parse edns: formerror.");
1269 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1270 memset(&reply_edns, 0, sizeof(reply_edns));
1271 reply_edns.edns_present = 1;
1272 reply_edns.udp_size = EDNS_ADVERTISED_SIZE;
1273 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
1274 error_encode(c->buffer, ret, &qinfo,
1275 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1276 sldns_buffer_read_u16_at(c->buffer, 2), &reply_edns);
1277 regional_free_all(worker->scratchpad);
1278 server_stats_insrcode(&worker->stats, c->buffer);
1281 if(edns.edns_present) {
1282 struct edns_option* edns_opt;
1283 if(edns.edns_version != 0) {
1284 edns.ext_rcode = (uint8_t)(EDNS_RCODE_BADVERS>>4);
1285 edns.edns_version = EDNS_ADVERTISED_VERSION;
1286 edns.udp_size = EDNS_ADVERTISED_SIZE;
1287 edns.bits &= EDNS_DO;
1288 edns.opt_list = NULL;
1289 verbose(VERB_ALGO, "query with bad edns version.");
1290 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1291 error_encode(c->buffer, EDNS_RCODE_BADVERS&0xf, &qinfo,
1292 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1293 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1294 if(sldns_buffer_capacity(c->buffer) >=
1295 sldns_buffer_limit(c->buffer)+calc_edns_field_size(&edns))
1296 attach_edns_record(c->buffer, &edns);
1297 regional_free_all(worker->scratchpad);
1300 if(edns.udp_size < NORMAL_UDP_SIZE &&
1301 worker->daemon->cfg->harden_short_bufsize) {
1302 verbose(VERB_QUERY, "worker request: EDNS bufsize %d ignored",
1303 (int)edns.udp_size);
1304 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1305 edns.udp_size = NORMAL_UDP_SIZE;
1307 if(c->type != comm_udp) {
1308 edns_opt = edns_opt_list_find(edns.opt_list, LDNS_EDNS_KEEPALIVE);
1309 if(edns_opt && edns_opt->opt_len > 0) {
1311 edns.edns_version = EDNS_ADVERTISED_VERSION;
1312 edns.udp_size = EDNS_ADVERTISED_SIZE;
1313 edns.bits &= EDNS_DO;
1314 edns.opt_list = NULL;
1315 verbose(VERB_ALGO, "query with bad edns keepalive.");
1316 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1317 error_encode(c->buffer, LDNS_RCODE_FORMERR, &qinfo,
1318 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1319 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1320 if(sldns_buffer_capacity(c->buffer) >=
1321 sldns_buffer_limit(c->buffer)+calc_edns_field_size(&edns))
1322 attach_edns_record(c->buffer, &edns);
1323 regional_free_all(worker->scratchpad);
1328 if(edns.udp_size > worker->daemon->cfg->max_udp_size &&
1329 c->type == comm_udp) {
1331 "worker request: max UDP reply size modified"
1332 " (%d to max-udp-size)", (int)edns.udp_size);
1333 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1334 edns.udp_size = worker->daemon->cfg->max_udp_size;
1336 if(edns.udp_size < LDNS_HEADER_SIZE) {
1337 verbose(VERB_ALGO, "worker request: edns is too small.");
1338 log_addr(VERB_CLIENT, "from", &repinfo->addr, repinfo->addrlen);
1339 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1340 LDNS_TC_SET(sldns_buffer_begin(c->buffer));
1341 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1342 LDNS_RCODE_SERVFAIL);
1343 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE);
1344 sldns_buffer_write_at(c->buffer, 4,
1345 (uint8_t*)"\0\0\0\0\0\0\0\0", 8);
1346 sldns_buffer_flip(c->buffer);
1347 regional_free_all(worker->scratchpad);
1350 if(worker->stats.extended)
1351 server_stats_insquery(&worker->stats, c, qinfo.qtype,
1352 qinfo.qclass, &edns, repinfo);
1353 if(c->type != comm_udp)
1354 edns.udp_size = 65535; /* max size for TCP replies */
1355 if(qinfo.qclass == LDNS_RR_CLASS_CH && answer_chaos(worker, &qinfo,
1356 &edns, repinfo, c->buffer)) {
1357 server_stats_insrcode(&worker->stats, c->buffer);
1358 regional_free_all(worker->scratchpad);
1361 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
1362 LDNS_PACKET_NOTIFY) {
1363 answer_notify(worker, &qinfo, &edns, c->buffer, repinfo);
1364 regional_free_all(worker->scratchpad);
1367 if(local_zones_answer(worker->daemon->local_zones, &worker->env, &qinfo,
1368 &edns, c->buffer, worker->scratchpad, repinfo, acladdr->taglist,
1369 acladdr->taglen, acladdr->tag_actions,
1370 acladdr->tag_actions_size, acladdr->tag_datas,
1371 acladdr->tag_datas_size, worker->daemon->cfg->tagname,
1372 worker->daemon->cfg->num_tags, acladdr->view)) {
1373 regional_free_all(worker->scratchpad);
1374 if(sldns_buffer_limit(c->buffer) == 0) {
1375 comm_point_drop_reply(repinfo);
1378 server_stats_insrcode(&worker->stats, c->buffer);
1381 if(worker->env.auth_zones &&
1382 rpz_apply_qname_trigger(worker->env.auth_zones,
1383 &worker->env, &qinfo, &edns, c->buffer, worker->scratchpad,
1384 repinfo, acladdr->taglist, acladdr->taglen, &worker->stats)) {
1385 regional_free_all(worker->scratchpad);
1386 if(sldns_buffer_limit(c->buffer) == 0) {
1387 comm_point_drop_reply(repinfo);
1390 server_stats_insrcode(&worker->stats, c->buffer);
1393 if(worker->env.auth_zones &&
1394 auth_zones_answer(worker->env.auth_zones, &worker->env,
1395 &qinfo, &edns, repinfo, c->buffer, worker->scratchpad)) {
1396 regional_free_all(worker->scratchpad);
1397 if(sldns_buffer_limit(c->buffer) == 0) {
1398 comm_point_drop_reply(repinfo);
1401 /* set RA for everyone that can have recursion (based on
1402 * access control list) */
1403 if(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer)) &&
1404 acl != acl_deny_non_local && acl != acl_refuse_non_local)
1405 LDNS_RA_SET(sldns_buffer_begin(c->buffer));
1406 server_stats_insrcode(&worker->stats, c->buffer);
1410 /* We've looked in our local zones. If the answer isn't there, we
1411 * might need to bail out based on ACLs now. */
1412 if((ret=deny_refuse_non_local(c, acl, worker, repinfo)) != -1)
1414 regional_free_all(worker->scratchpad);
1420 /* If this request does not have the recursion bit set, verify
1421 * ACLs allow the recursion bit to be treated as set. */
1422 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) &&
1423 acl == acl_allow_setrd ) {
1424 LDNS_RD_SET(sldns_buffer_begin(c->buffer));
1427 /* If this request does not have the recursion bit set, verify
1428 * ACLs allow the snooping. */
1429 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) &&
1430 acl != acl_allow_snoop ) {
1431 error_encode(c->buffer, LDNS_RCODE_REFUSED, &qinfo,
1432 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1433 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1434 regional_free_all(worker->scratchpad);
1435 server_stats_insrcode(&worker->stats, c->buffer);
1436 log_addr(VERB_ALGO, "refused nonrec (cache snoop) query from",
1437 &repinfo->addr, repinfo->addrlen);
1441 /* If we've found a local alias, replace the qname with the alias
1442 * target before resolving it. */
1443 if(qinfo.local_alias) {
1444 struct ub_packed_rrset_key* rrset = qinfo.local_alias->rrset;
1445 struct packed_rrset_data* d = rrset->entry.data;
1447 /* Sanity check: our current implementation only supports
1448 * a single CNAME RRset as a local alias. */
1449 if(qinfo.local_alias->next ||
1450 rrset->rk.type != htons(LDNS_RR_TYPE_CNAME) ||
1452 log_err("assumption failure: unexpected local alias");
1453 regional_free_all(worker->scratchpad);
1454 return 0; /* drop it */
1456 qinfo.qname = d->rr_data[0] + 2;
1457 qinfo.qname_len = d->rr_len[0] - 2;
1460 /* If we may apply IP-based actions to the answer, build the client
1461 * information. As this can be expensive, skip it if there is
1462 * absolutely no possibility of it. */
1463 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) &&
1464 (qinfo.qtype == LDNS_RR_TYPE_A ||
1465 qinfo.qtype == LDNS_RR_TYPE_AAAA ||
1466 qinfo.qtype == LDNS_RR_TYPE_ANY)) {
1467 cinfo_tmp.taglist = acladdr->taglist;
1468 cinfo_tmp.taglen = acladdr->taglen;
1469 cinfo_tmp.tag_actions = acladdr->tag_actions;
1470 cinfo_tmp.tag_actions_size = acladdr->tag_actions_size;
1471 cinfo_tmp.tag_datas = acladdr->tag_datas;
1472 cinfo_tmp.tag_datas_size = acladdr->tag_datas_size;
1473 cinfo_tmp.view = acladdr->view;
1474 cinfo_tmp.respip_set = worker->daemon->respip_set;
1479 /* Lookup the cache. In case we chase an intermediate CNAME chain
1480 * this is a two-pass operation, and lookup_qinfo is different for
1481 * each pass. We should still pass the original qinfo to
1482 * answer_from_cache(), however, since it's used to build the reply. */
1483 if(!edns_bypass_cache_stage(edns.opt_list, &worker->env)) {
1484 is_expired_answer = 0;
1485 is_secure_answer = 0;
1486 h = query_info_hash(lookup_qinfo, sldns_buffer_read_u16_at(c->buffer, 2));
1487 if((e=slabhash_lookup(worker->env.msg_cache, h, lookup_qinfo, 0))) {
1488 /* answer from cache - we have acquired a readlock on it */
1489 if(answer_from_cache(worker, &qinfo,
1490 cinfo, &need_drop, &is_expired_answer, &is_secure_answer,
1491 &alias_rrset, &partial_rep, (struct reply_info*)e->data,
1492 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1493 sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
1495 /* prefetch it if the prefetch TTL expired.
1496 * Note that if there is more than one pass
1497 * its qname must be that used for cache
1499 if((worker->env.cfg->prefetch && *worker->env.now >=
1500 ((struct reply_info*)e->data)->prefetch_ttl) ||
1501 (worker->env.cfg->serve_expired &&
1502 *worker->env.now >= ((struct reply_info*)e->data)->ttl)) {
1504 time_t leeway = ((struct reply_info*)e->
1505 data)->ttl - *worker->env.now;
1506 if(((struct reply_info*)e->data)->ttl
1509 lock_rw_unlock(&e->lock);
1510 reply_and_prefetch(worker, lookup_qinfo,
1511 sldns_buffer_read_u16_at(c->buffer, 2),
1513 (partial_rep || need_drop));
1516 regional_free_all(worker->scratchpad);
1519 } else if(!partial_rep) {
1520 lock_rw_unlock(&e->lock);
1521 regional_free_all(worker->scratchpad);
1524 /* Note that we've already released the
1525 * lock if we're here after prefetch. */
1526 lock_rw_unlock(&e->lock);
1528 /* We've found a partial reply ending with an
1529 * alias. Replace the lookup qinfo for the
1530 * alias target and lookup the cache again to
1531 * (possibly) complete the reply. As we're
1532 * passing the "base" reply, there will be no
1533 * more alias chasing. */
1534 memset(&qinfo_tmp, 0, sizeof(qinfo_tmp));
1535 get_cname_target(alias_rrset, &qinfo_tmp.qname,
1536 &qinfo_tmp.qname_len);
1537 if(!qinfo_tmp.qname) {
1538 log_err("unexpected: invalid answer alias");
1539 regional_free_all(worker->scratchpad);
1540 return 0; /* drop query */
1542 qinfo_tmp.qtype = qinfo.qtype;
1543 qinfo_tmp.qclass = qinfo.qclass;
1544 lookup_qinfo = &qinfo_tmp;
1547 verbose(VERB_ALGO, "answer from the cache failed");
1548 lock_rw_unlock(&e->lock);
1550 if(!LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) {
1551 if(answer_norec_from_cache(worker, &qinfo,
1552 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1553 sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
1555 regional_free_all(worker->scratchpad);
1558 verbose(VERB_ALGO, "answer norec from cache -- "
1559 "need to validate or not primed");
1562 sldns_buffer_rewind(c->buffer);
1563 server_stats_querymiss(&worker->stats, worker);
1565 if(verbosity >= VERB_CLIENT) {
1566 if(c->type == comm_udp)
1567 log_addr(VERB_CLIENT, "udp request from",
1568 &repinfo->addr, repinfo->addrlen);
1569 else log_addr(VERB_CLIENT, "tcp request from",
1570 &repinfo->addr, repinfo->addrlen);
1573 /* grab a work request structure for this new request */
1574 mesh_new_client(worker->env.mesh, &qinfo, cinfo,
1575 sldns_buffer_read_u16_at(c->buffer, 2),
1576 &edns, repinfo, *(uint16_t*)(void *)sldns_buffer_begin(c->buffer));
1577 regional_free_all(worker->scratchpad);
1578 worker_mem_report(worker, NULL);
1585 comm_point_drop_reply(repinfo);
1588 if(is_expired_answer) {
1589 worker->stats.ans_expired++;
1591 if(worker->stats.extended) {
1592 if(is_secure_answer) worker->stats.ans_secure++;
1593 server_stats_insrcode(&worker->stats, repinfo->c->buffer);
1596 if(worker->dtenv.log_client_response_messages)
1597 dt_msg_send_client_response(&worker->dtenv, &repinfo->addr,
1598 c->type, c->buffer);
1600 if(worker->env.cfg->log_replies)
1603 memset(&tv, 0, sizeof(tv));
1604 if(qinfo.local_alias && qinfo.local_alias->rrset &&
1605 qinfo.local_alias->rrset->rk.dname) {
1606 /* log original qname, before the local alias was
1607 * used to resolve that CNAME to something else */
1608 qinfo.qname = qinfo.local_alias->rrset->rk.dname;
1609 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen,
1612 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen,
1617 if(!dnsc_handle_uncurved_request(repinfo)) {
1625 worker_sighandler(int sig, void* arg)
1627 /* note that log, print, syscalls here give race conditions.
1628 * And cause hangups if the log-lock is held by the application. */
1629 struct worker* worker = (struct worker*)arg;
1633 comm_base_exit(worker->base);
1637 worker->need_to_exit = 1;
1638 comm_base_exit(worker->base);
1642 worker->need_to_exit = 1;
1643 comm_base_exit(worker->base);
1647 worker->need_to_exit = 1;
1648 comm_base_exit(worker->base);
1651 /* unknown signal, ignored */
1656 /** restart statistics timer for worker, if enabled */
1658 worker_restart_timer(struct worker* worker)
1660 if(worker->env.cfg->stat_interval > 0) {
1663 tv.tv_sec = worker->env.cfg->stat_interval;
1666 comm_timer_set(worker->stat_timer, &tv);
1670 void worker_stat_timer_cb(void* arg)
1672 struct worker* worker = (struct worker*)arg;
1673 server_stats_log(&worker->stats, worker, worker->thread_num);
1674 mesh_stats(worker->env.mesh, "mesh has");
1675 worker_mem_report(worker, NULL);
1676 /* SHM is enabled, process data to SHM */
1677 if (worker->daemon->cfg->shm_enable) {
1678 shm_main_run(worker);
1680 if(!worker->daemon->cfg->stat_cumulative) {
1681 worker_stats_clear(worker);
1683 /* start next timer */
1684 worker_restart_timer(worker);
1687 void worker_probe_timer_cb(void* arg)
1689 struct worker* worker = (struct worker*)arg;
1692 tv.tv_sec = (time_t)autr_probe_timer(&worker->env);
1696 comm_timer_set(worker->env.probe_timer, &tv);
1700 worker_create(struct daemon* daemon, int id, int* ports, int n)
1703 struct worker* worker = (struct worker*)calloc(1,
1704 sizeof(struct worker));
1707 worker->numports = n;
1708 worker->ports = (int*)memdup(ports, sizeof(int)*n);
1709 if(!worker->ports) {
1713 worker->daemon = daemon;
1714 worker->thread_num = id;
1715 if(!(worker->cmd = tube_create())) {
1716 free(worker->ports);
1720 /* create random state here to avoid locking trouble in RAND_bytes */
1721 if(!(worker->rndstate = ub_initstate(daemon->rand))) {
1722 log_err("could not init random numbers.");
1723 tube_delete(worker->cmd);
1724 free(worker->ports);
1728 explicit_bzero(&seed, sizeof(seed));
1730 if(daemon->cfg->dnstap) {
1731 log_assert(daemon->dtenv != NULL);
1732 memcpy(&worker->dtenv, daemon->dtenv, sizeof(struct dt_env));
1733 if(!dt_init(&worker->dtenv))
1734 fatal_exit("dt_init failed");
1741 worker_init(struct worker* worker, struct config_file *cfg,
1742 struct listen_port* ports, int do_sigs)
1745 struct dt_env* dtenv = &worker->dtenv;
1749 worker->need_to_exit = 0;
1750 worker->base = comm_base_create(do_sigs);
1752 log_err("could not create event handling base");
1753 worker_delete(worker);
1756 comm_base_set_slow_accept_handlers(worker->base, &worker_stop_accept,
1757 &worker_start_accept, worker);
1760 ub_thread_sig_unblock(SIGHUP);
1762 ub_thread_sig_unblock(SIGINT);
1764 ub_thread_sig_unblock(SIGQUIT);
1766 ub_thread_sig_unblock(SIGTERM);
1767 #ifndef LIBEVENT_SIGNAL_PROBLEM
1768 worker->comsig = comm_signal_create(worker->base,
1769 worker_sighandler, worker);
1772 || !comm_signal_bind(worker->comsig, SIGHUP)
1775 || !comm_signal_bind(worker->comsig, SIGQUIT)
1777 || !comm_signal_bind(worker->comsig, SIGTERM)
1778 || !comm_signal_bind(worker->comsig, SIGINT)) {
1779 log_err("could not create signal handlers");
1780 worker_delete(worker);
1783 #endif /* LIBEVENT_SIGNAL_PROBLEM */
1784 if(!daemon_remote_open_accept(worker->daemon->rc,
1785 worker->daemon->rc_ports, worker)) {
1786 worker_delete(worker);
1789 #ifdef UB_ON_WINDOWS
1790 wsvc_setup_worker(worker);
1791 #endif /* UB_ON_WINDOWS */
1792 } else { /* !do_sigs */
1793 worker->comsig = NULL;
1795 worker->front = listen_create(worker->base, ports,
1796 cfg->msg_buffer_size, (int)cfg->incoming_num_tcp,
1797 cfg->do_tcp_keepalive
1798 ? cfg->tcp_keepalive_timeout
1799 : cfg->tcp_idle_timeout,
1800 worker->daemon->tcl,
1801 worker->daemon->listen_sslctx,
1802 dtenv, worker_handle_request, worker);
1803 if(!worker->front) {
1804 log_err("could not create listening sockets");
1805 worker_delete(worker);
1808 worker->back = outside_network_create(worker->base,
1809 cfg->msg_buffer_size, (size_t)cfg->outgoing_num_ports,
1810 cfg->out_ifs, cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6,
1811 cfg->do_tcp?cfg->outgoing_num_tcp:0, cfg->ip_dscp,
1812 worker->daemon->env->infra_cache, worker->rndstate,
1813 cfg->use_caps_bits_for_id, worker->ports, worker->numports,
1814 cfg->unwanted_threshold, cfg->outgoing_tcp_mss,
1815 &worker_alloc_cleanup, worker,
1816 cfg->do_udp || cfg->udp_upstream_without_downstream,
1817 worker->daemon->connect_sslctx, cfg->delay_close,
1818 cfg->tls_use_sni, dtenv);
1820 log_err("could not create outgoing sockets");
1821 worker_delete(worker);
1824 /* start listening to commands */
1825 if(!tube_setup_bg_listen(worker->cmd, worker->base,
1826 &worker_handle_control_cmd, worker)) {
1827 log_err("could not create control compt.");
1828 worker_delete(worker);
1831 worker->stat_timer = comm_timer_create(worker->base,
1832 worker_stat_timer_cb, worker);
1833 if(!worker->stat_timer) {
1834 log_err("could not create statistics timer");
1837 /* we use the msg_buffer_size as a good estimate for what the
1838 * user wants for memory usage sizes */
1839 worker->scratchpad = regional_create_custom(cfg->msg_buffer_size);
1840 if(!worker->scratchpad) {
1841 log_err("malloc failure");
1842 worker_delete(worker);
1846 server_stats_init(&worker->stats, cfg);
1847 alloc_init(&worker->alloc, &worker->daemon->superalloc,
1848 worker->thread_num);
1849 alloc_set_id_cleanup(&worker->alloc, &worker_alloc_cleanup, worker);
1850 worker->env = *worker->daemon->env;
1851 comm_base_timept(worker->base, &worker->env.now, &worker->env.now_tv);
1852 worker->env.worker = worker;
1853 worker->env.worker_base = worker->base;
1854 worker->env.send_query = &worker_send_query;
1855 worker->env.alloc = &worker->alloc;
1856 worker->env.outnet = worker->back;
1857 worker->env.rnd = worker->rndstate;
1858 /* If case prefetch is triggered, the corresponding mesh will clear
1859 * the scratchpad for the module env in the middle of request handling.
1860 * It would be prone to a use-after-free kind of bug, so we avoid
1861 * sharing it with worker's own scratchpad at the cost of having
1862 * one more pad per worker. */
1863 worker->env.scratch = regional_create_custom(cfg->msg_buffer_size);
1864 if(!worker->env.scratch) {
1865 log_err("malloc failure");
1866 worker_delete(worker);
1869 worker->env.mesh = mesh_create(&worker->daemon->mods, &worker->env);
1870 /* Pass on daemon variables that we would need in the mesh area */
1871 worker->env.mesh->use_response_ip = worker->daemon->use_response_ip;
1872 worker->env.mesh->use_rpz = worker->daemon->use_rpz;
1874 worker->env.detach_subs = &mesh_detach_subs;
1875 worker->env.attach_sub = &mesh_attach_sub;
1876 worker->env.add_sub = &mesh_add_sub;
1877 worker->env.kill_sub = &mesh_state_delete;
1878 worker->env.detect_cycle = &mesh_detect_cycle;
1879 worker->env.scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size);
1880 if(!(worker->env.fwds = forwards_create()) ||
1881 !forwards_apply_cfg(worker->env.fwds, cfg)) {
1882 log_err("Could not set forward zones");
1883 worker_delete(worker);
1886 if(!(worker->env.hints = hints_create()) ||
1887 !hints_apply_cfg(worker->env.hints, cfg)) {
1888 log_err("Could not set root or stub hints");
1889 worker_delete(worker);
1892 /* one probe timer per process -- if we have 5011 anchors */
1893 if(autr_get_num_anchors(worker->env.anchors) > 0
1894 #ifndef THREADS_DISABLED
1895 && worker->thread_num == 0
1901 worker->env.probe_timer = comm_timer_create(worker->base,
1902 worker_probe_timer_cb, worker);
1903 if(!worker->env.probe_timer) {
1904 log_err("could not create 5011-probe timer");
1906 /* let timer fire, then it can reset itself */
1907 comm_timer_set(worker->env.probe_timer, &tv);
1910 /* zone transfer tasks, setup once per process, if any */
1911 if(worker->env.auth_zones
1912 #ifndef THREADS_DISABLED
1913 && worker->thread_num == 0
1916 auth_xfer_pickup_initial(worker->env.auth_zones, &worker->env);
1919 if(worker->daemon->cfg->dnstap
1920 #ifndef THREADS_DISABLED
1921 && worker->thread_num == 0
1924 if(!dt_io_thread_start(dtenv->dtio, comm_base_internal(
1925 worker->base), worker->daemon->num)) {
1926 log_err("could not start dnstap io thread");
1927 worker_delete(worker);
1931 #endif /* USE_DNSTAP */
1932 if(!worker->env.mesh || !worker->env.scratch_buffer) {
1933 worker_delete(worker);
1936 worker_mem_report(worker, NULL);
1937 /* if statistics enabled start timer */
1938 if(worker->env.cfg->stat_interval > 0) {
1939 verbose(VERB_ALGO, "set statistics interval %d secs",
1940 worker->env.cfg->stat_interval);
1941 worker_restart_timer(worker);
1947 worker_work(struct worker* worker)
1949 comm_base_dispatch(worker->base);
1953 worker_delete(struct worker* worker)
1957 if(worker->env.mesh && verbosity >= VERB_OPS) {
1958 server_stats_log(&worker->stats, worker, worker->thread_num);
1959 mesh_stats(worker->env.mesh, "mesh has");
1960 worker_mem_report(worker, NULL);
1962 outside_network_quit_prepare(worker->back);
1963 mesh_delete(worker->env.mesh);
1964 sldns_buffer_free(worker->env.scratch_buffer);
1965 forwards_delete(worker->env.fwds);
1966 hints_delete(worker->env.hints);
1967 listen_delete(worker->front);
1968 outside_network_delete(worker->back);
1969 comm_signal_delete(worker->comsig);
1970 tube_delete(worker->cmd);
1971 comm_timer_delete(worker->stat_timer);
1972 comm_timer_delete(worker->env.probe_timer);
1973 free(worker->ports);
1974 if(worker->thread_num == 0) {
1975 #ifdef UB_ON_WINDOWS
1976 wsvc_desetup_worker(worker);
1977 #endif /* UB_ON_WINDOWS */
1980 if(worker->daemon->cfg->dnstap
1981 #ifndef THREADS_DISABLED
1982 && worker->thread_num == 0
1985 dt_io_thread_stop(worker->dtenv.dtio);
1987 dt_deinit(&worker->dtenv);
1988 #endif /* USE_DNSTAP */
1989 comm_base_delete(worker->base);
1990 ub_randfree(worker->rndstate);
1991 alloc_clear(&worker->alloc);
1992 regional_destroy(worker->env.scratch);
1993 regional_destroy(worker->scratchpad);
1997 struct outbound_entry*
1998 worker_send_query(struct query_info* qinfo, uint16_t flags, int dnssec,
1999 int want_dnssec, int nocaps, struct sockaddr_storage* addr,
2000 socklen_t addrlen, uint8_t* zone, size_t zonelen, int ssl_upstream,
2001 char* tls_auth_name, struct module_qstate* q)
2003 struct worker* worker = q->env->worker;
2004 struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
2005 q->region, sizeof(*e));
2009 e->qsent = outnet_serviced_query(worker->back, qinfo, flags, dnssec,
2010 want_dnssec, nocaps, q->env->cfg->tcp_upstream,
2011 ssl_upstream, tls_auth_name, addr, addrlen, zone, zonelen, q,
2012 worker_handle_service_reply, e, worker->back->udp_buff, q->env);
2020 worker_alloc_cleanup(void* arg)
2022 struct worker* worker = (struct worker*)arg;
2023 slabhash_clear(&worker->env.rrset_cache->table);
2024 slabhash_clear(worker->env.msg_cache);
2027 void worker_stats_clear(struct worker* worker)
2029 server_stats_init(&worker->stats, worker->env.cfg);
2030 mesh_stats_clear(worker->env.mesh);
2031 worker->back->unwanted_replies = 0;
2032 worker->back->num_tcp_outgoing = 0;
2035 void worker_start_accept(void* arg)
2037 struct worker* worker = (struct worker*)arg;
2038 listen_start_accept(worker->front);
2039 if(worker->thread_num == 0)
2040 daemon_remote_start_accept(worker->daemon->rc);
2043 void worker_stop_accept(void* arg)
2045 struct worker* worker = (struct worker*)arg;
2046 listen_stop_accept(worker->front);
2047 if(worker->thread_num == 0)
2048 daemon_remote_stop_accept(worker->daemon->rc);
2051 /* --- fake callbacks for fptr_wlist to work --- */
2052 struct outbound_entry* libworker_send_query(
2053 struct query_info* ATTR_UNUSED(qinfo),
2054 uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec),
2055 int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps),
2056 struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen),
2057 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen),
2058 int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name),
2059 struct module_qstate* ATTR_UNUSED(q))
2065 int libworker_handle_reply(struct comm_point* ATTR_UNUSED(c),
2066 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
2067 struct comm_reply* ATTR_UNUSED(reply_info))
2073 int libworker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
2074 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
2075 struct comm_reply* ATTR_UNUSED(reply_info))
2081 void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
2082 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
2083 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
2088 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2089 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2090 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2095 void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2096 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2097 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2102 void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2103 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2104 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2109 int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
2115 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
2121 int codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
2128 void dtio_tap_callback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev),
2129 void* ATTR_UNUSED(arg))
2136 void dtio_mainfdcallback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev),
2137 void* ATTR_UNUSED(arg))