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"
83 #ifdef HAVE_SYS_TYPES_H
84 # include <sys/types.h>
91 #include "winrc/win_svc.h"
94 /** Size of an UDP datagram */
95 #define NORMAL_UDP_SIZE 512 /* bytes */
96 /** ratelimit for error responses */
97 #define ERROR_RATELIMIT 100 /* qps */
100 * seconds to add to prefetch leeway. This is a TTL that expires old rrsets
101 * earlier than they should in order to put the new update into the cache.
102 * This additional value is to make sure that if not all TTLs are equal in
103 * the message to be updated(and replaced), that rrsets with up to this much
104 * extra TTL are also replaced. This means that the resulting new message
105 * will have (most likely) this TTL at least, avoiding very small 'split
106 * second' TTLs due to operators choosing relative primes for TTLs (or so).
107 * Also has to be at least one to break ties (and overwrite cached entry).
109 #define PREFETCH_EXPIRY_ADD 60
111 /** Report on memory usage by this thread and global */
113 worker_mem_report(struct worker* ATTR_UNUSED(worker),
114 struct serviced_query* ATTR_UNUSED(cur_serv))
116 #ifdef UNBOUND_ALLOC_STATS
117 /* measure memory leakage */
118 extern size_t unbound_mem_alloc, unbound_mem_freed;
119 /* debug func in validator module */
120 size_t total, front, back, mesh, msg, rrset, infra, ac, superac;
121 size_t me, iter, val, anch;
125 #endif /* CLIENT_SUBNET */
126 if(verbosity < VERB_ALGO)
128 front = listen_get_mem(worker->front);
129 back = outnet_get_mem(worker->back);
130 msg = slabhash_get_mem(worker->env.msg_cache);
131 rrset = slabhash_get_mem(&worker->env.rrset_cache->table);
132 infra = infra_get_mem(worker->env.infra_cache);
133 mesh = mesh_get_mem(worker->env.mesh);
134 ac = alloc_get_mem(&worker->alloc);
135 superac = alloc_get_mem(&worker->daemon->superalloc);
136 anch = anchors_get_mem(worker->env.anchors);
139 for(i=0; i<worker->env.mesh->mods.num; i++) {
140 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
141 mods.mod[i]->get_mem));
142 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
143 val += (*worker->env.mesh->mods.mod[i]->get_mem)
146 else if(strcmp(worker->env.mesh->mods.mod[i]->name,
148 subnet += (*worker->env.mesh->mods.mod[i]->get_mem)
150 #endif /* CLIENT_SUBNET */
151 else iter += (*worker->env.mesh->mods.mod[i]->get_mem)
154 me = sizeof(*worker) + sizeof(*worker->base) + sizeof(*worker->comsig)
155 + comm_point_get_mem(worker->cmd_com)
156 + sizeof(worker->rndstate)
157 + regional_get_mem(worker->scratchpad)
158 + sizeof(*worker->env.scratch_buffer)
159 + sldns_buffer_capacity(worker->env.scratch_buffer)
160 + forwards_get_mem(worker->env.fwds)
161 + hints_get_mem(worker->env.hints);
162 if(worker->thread_num == 0)
163 me += acl_list_get_mem(worker->daemon->acl);
165 me += serviced_get_mem(cur_serv);
167 total = front+back+mesh+msg+rrset+infra+iter+val+ac+superac+me;
170 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u "
171 "rrset=%u infra=%u iter=%u val=%u subnet=%u anchors=%u "
172 "alloccache=%u globalalloccache=%u me=%u",
173 (unsigned)total, (unsigned)front, (unsigned)back,
174 (unsigned)mesh, (unsigned)msg, (unsigned)rrset, (unsigned)infra,
175 (unsigned)iter, (unsigned)val,
176 (unsigned)subnet, (unsigned)anch, (unsigned)ac,
177 (unsigned)superac, (unsigned)me);
178 #else /* no CLIENT_SUBNET */
179 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u "
180 "rrset=%u infra=%u iter=%u val=%u anchors=%u "
181 "alloccache=%u globalalloccache=%u me=%u",
182 (unsigned)total, (unsigned)front, (unsigned)back,
183 (unsigned)mesh, (unsigned)msg, (unsigned)rrset,
184 (unsigned)infra, (unsigned)iter, (unsigned)val, (unsigned)anch,
185 (unsigned)ac, (unsigned)superac, (unsigned)me);
186 #endif /* CLIENT_SUBNET */
187 log_info("Total heap memory estimate: %u total-alloc: %u "
188 "total-free: %u", (unsigned)total,
189 (unsigned)unbound_mem_alloc, (unsigned)unbound_mem_freed);
190 #else /* no UNBOUND_ALLOC_STATS */
194 #endif /* CLIENT_SUBNET */
196 if(verbosity < VERB_QUERY)
198 for(i=0; i<worker->env.mesh->mods.num; i++) {
199 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
200 mods.mod[i]->get_mem));
201 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
202 val += (*worker->env.mesh->mods.mod[i]->get_mem)
205 else if(strcmp(worker->env.mesh->mods.mod[i]->name,
207 subnet += (*worker->env.mesh->mods.mod[i]->get_mem)
209 #endif /* CLIENT_SUBNET */
212 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u "
214 (unsigned)slabhash_get_mem(worker->env.msg_cache),
215 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table),
216 (unsigned)infra_get_mem(worker->env.infra_cache),
217 (unsigned)val, (unsigned)subnet);
218 #else /* no CLIENT_SUBNET */
219 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u",
220 (unsigned)slabhash_get_mem(worker->env.msg_cache),
221 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table),
222 (unsigned)infra_get_mem(worker->env.infra_cache),
224 #endif /* CLIENT_SUBNET */
225 #endif /* UNBOUND_ALLOC_STATS */
229 worker_send_cmd(struct worker* worker, enum worker_commands cmd)
231 uint32_t c = (uint32_t)htonl(cmd);
232 if(!tube_write_msg(worker->cmd, (uint8_t*)&c, sizeof(c), 0)) {
233 log_err("worker send cmd %d failed", (int)cmd);
238 worker_handle_reply(struct comm_point* c, void* arg, int error,
239 struct comm_reply* reply_info)
241 struct module_qstate* q = (struct module_qstate*)arg;
242 struct worker* worker = q->env->worker;
243 struct outbound_entry e;
248 mesh_report_reply(worker->env.mesh, &e, reply_info, error);
249 worker_mem_report(worker, NULL);
253 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
254 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
256 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
257 /* error becomes timeout for the module as if this reply
259 mesh_report_reply(worker->env.mesh, &e, reply_info,
261 worker_mem_report(worker, NULL);
264 mesh_report_reply(worker->env.mesh, &e, reply_info, NETEVENT_NOERROR);
265 worker_mem_report(worker, NULL);
270 worker_handle_service_reply(struct comm_point* c, void* arg, int error,
271 struct comm_reply* reply_info)
273 struct outbound_entry* e = (struct outbound_entry*)arg;
274 struct worker* worker = e->qstate->env->worker;
275 struct serviced_query *sq = e->qsent;
277 verbose(VERB_ALGO, "worker svcd callback for qstate %p", e->qstate);
279 mesh_report_reply(worker->env.mesh, e, reply_info, error);
280 worker_mem_report(worker, sq);
284 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
285 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
287 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
288 /* error becomes timeout for the module as if this reply
290 verbose(VERB_ALGO, "worker: bad reply handled as timeout");
291 mesh_report_reply(worker->env.mesh, e, reply_info,
293 worker_mem_report(worker, sq);
296 mesh_report_reply(worker->env.mesh, e, reply_info, NETEVENT_NOERROR);
297 worker_mem_report(worker, sq);
301 /** ratelimit error replies
302 * @param worker: the worker struct with ratelimit counter
303 * @param err: error code that would be wanted.
304 * @return value of err if okay, or -1 if it should be discarded instead.
307 worker_err_ratelimit(struct worker* worker, int err)
309 if(worker->err_limit_time == *worker->env.now) {
310 /* see if limit is exceeded for this second */
311 if(worker->err_limit_count++ > ERROR_RATELIMIT)
314 /* new second, new limits */
315 worker->err_limit_time = *worker->env.now;
316 worker->err_limit_count = 1;
321 /** check request sanity.
322 * @param pkt: the wire packet to examine for sanity.
323 * @param worker: parameters for checking.
324 * @return error code, 0 OK, or -1 discard.
327 worker_check_request(sldns_buffer* pkt, struct worker* worker)
329 if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) {
330 verbose(VERB_QUERY, "request too short, discarded");
333 if(sldns_buffer_limit(pkt) > NORMAL_UDP_SIZE &&
334 worker->daemon->cfg->harden_large_queries) {
335 verbose(VERB_QUERY, "request too large, discarded");
338 if(LDNS_QR_WIRE(sldns_buffer_begin(pkt))) {
339 verbose(VERB_QUERY, "request has QR bit on, discarded");
342 if(LDNS_TC_WIRE(sldns_buffer_begin(pkt))) {
343 LDNS_TC_CLR(sldns_buffer_begin(pkt));
344 verbose(VERB_QUERY, "request bad, has TC bit on");
345 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
347 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY &&
348 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY) {
349 verbose(VERB_QUERY, "request unknown opcode %d",
350 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)));
351 return worker_err_ratelimit(worker, LDNS_RCODE_NOTIMPL);
353 if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1) {
354 verbose(VERB_QUERY, "request wrong nr qd=%d",
355 LDNS_QDCOUNT(sldns_buffer_begin(pkt)));
356 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
358 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 0 &&
359 (LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 1 ||
360 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY)) {
361 verbose(VERB_QUERY, "request wrong nr an=%d",
362 LDNS_ANCOUNT(sldns_buffer_begin(pkt)));
363 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
365 if(LDNS_NSCOUNT(sldns_buffer_begin(pkt)) != 0) {
366 verbose(VERB_QUERY, "request wrong nr ns=%d",
367 LDNS_NSCOUNT(sldns_buffer_begin(pkt)));
368 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
370 if(LDNS_ARCOUNT(sldns_buffer_begin(pkt)) > 1) {
371 verbose(VERB_QUERY, "request wrong nr ar=%d",
372 LDNS_ARCOUNT(sldns_buffer_begin(pkt)));
373 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR);
379 worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), uint8_t* msg,
380 size_t len, int error, void* arg)
382 struct worker* worker = (struct worker*)arg;
383 enum worker_commands cmd;
384 if(error != NETEVENT_NOERROR) {
386 if(error == NETEVENT_CLOSED)
387 comm_base_exit(worker->base);
388 else log_info("control event: %d", error);
391 if(len != sizeof(uint32_t)) {
392 fatal_exit("bad control msg length %d", (int)len);
394 cmd = sldns_read_uint32(msg);
397 case worker_cmd_quit:
398 verbose(VERB_ALGO, "got control cmd quit");
399 comm_base_exit(worker->base);
401 case worker_cmd_stats:
402 verbose(VERB_ALGO, "got control cmd stats");
403 server_stats_reply(worker, 1);
405 case worker_cmd_stats_noreset:
406 verbose(VERB_ALGO, "got control cmd stats_noreset");
407 server_stats_reply(worker, 0);
409 case worker_cmd_remote:
410 verbose(VERB_ALGO, "got control cmd remote");
411 daemon_remote_exec(worker);
414 log_err("bad command %d", (int)cmd);
419 /** check if a delegation is secure */
420 static enum sec_status
421 check_delegation_secure(struct reply_info *rep)
423 /* return smallest security status */
425 enum sec_status sec = sec_status_secure;
427 size_t num = rep->an_numrrsets + rep->ns_numrrsets;
428 /* check if answer and authority are OK */
429 for(i=0; i<num; i++) {
430 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
435 /* in additional, only unchecked triggers revalidation */
436 for(i=num; i<rep->rrset_count; i++) {
437 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
439 if(s == sec_status_unchecked)
445 /** remove nonsecure from a delegation referral additional section */
447 deleg_remove_nonsecure_additional(struct reply_info* rep)
449 /* we can simply edit it, since we are working in the scratch region */
453 for(i = rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
454 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
456 if(s != sec_status_secure) {
457 memmove(rep->rrsets+i, rep->rrsets+i+1,
458 sizeof(struct ub_packed_rrset_key*)*
459 (rep->rrset_count - i - 1));
467 /** answer nonrecursive query from the cache */
469 answer_norec_from_cache(struct worker* worker, struct query_info* qinfo,
470 uint16_t id, uint16_t flags, struct comm_reply* repinfo,
471 struct edns_data* edns)
473 /* for a nonrecursive query return either:
474 * o an error (servfail; we try to avoid this)
475 * o a delegation (closest we have; this routine tries that)
476 * o the answer (checked by answer_from_cache)
478 * So, grab a delegation from the rrset cache.
479 * Then check if it needs validation, if so, this routine fails,
480 * so that iterator can prime and validator can verify rrsets.
482 struct edns_data edns_bak;
483 uint16_t udpsize = edns->udp_size;
485 time_t timenow = *worker->env.now;
486 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
487 && worker->env.need_to_validate;
488 struct dns_msg *msg = NULL;
491 dp = dns_cache_find_delegation(&worker->env, qinfo->qname,
492 qinfo->qname_len, qinfo->qtype, qinfo->qclass,
493 worker->scratchpad, &msg, timenow);
494 if(!dp) { /* no delegation, need to reprime */
497 /* In case we have a local alias, copy it into the delegation message.
498 * Shallow copy should be fine, as we'll be done with msg in this
500 msg->qinfo.local_alias = qinfo->local_alias;
502 switch(check_delegation_secure(msg->rep)) {
503 case sec_status_unchecked:
504 /* some rrsets have not been verified yet, go and
505 * let validator do that */
507 case sec_status_bogus:
508 case sec_status_secure_sentinel_fail:
509 /* some rrsets are bogus, reply servfail */
510 edns->edns_version = EDNS_ADVERTISED_VERSION;
511 edns->udp_size = EDNS_ADVERTISED_SIZE;
513 edns->bits &= EDNS_DO;
514 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL,
515 msg->rep, LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
517 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
518 &msg->qinfo, id, flags, edns);
519 if(worker->stats.extended) {
520 worker->stats.ans_bogus++;
521 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL]++;
524 case sec_status_secure:
525 /* all rrsets are secure */
526 /* remove non-secure rrsets from the add. section*/
527 if(worker->env.cfg->val_clean_additional)
528 deleg_remove_nonsecure_additional(msg->rep);
531 case sec_status_indeterminate:
532 case sec_status_insecure:
539 /* return this delegation from the cache */
541 edns->edns_version = EDNS_ADVERTISED_VERSION;
542 edns->udp_size = EDNS_ADVERTISED_SIZE;
544 edns->bits &= EDNS_DO;
545 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, msg->rep,
546 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad))
548 msg->rep->flags |= BIT_QR|BIT_RA;
549 if(!apply_edns_options(edns, &edns_bak, worker->env.cfg,
550 repinfo->c, worker->scratchpad) ||
551 !reply_info_answer_encode(&msg->qinfo, msg->rep, id, flags,
552 repinfo->c->buffer, 0, 1, worker->scratchpad,
553 udpsize, edns, (int)(edns->bits & EDNS_DO), secure)) {
554 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL,
555 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
556 edns->opt_list = NULL;
557 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
558 &msg->qinfo, id, flags, edns);
560 if(worker->stats.extended) {
561 if(secure) worker->stats.ans_secure++;
562 server_stats_insrcode(&worker->stats, repinfo->c->buffer);
567 /** Apply, if applicable, a response IP action to a cached answer.
568 * If the answer is rewritten as a result of an action, '*encode_repp' will
569 * point to the reply info containing the modified answer. '*encode_repp' will
570 * be intact otherwise.
571 * It returns 1 on success, 0 otherwise. */
573 apply_respip_action(struct worker* worker, const struct query_info* qinfo,
574 struct respip_client_info* cinfo, struct reply_info* rep,
575 struct comm_reply* repinfo, struct ub_packed_rrset_key** alias_rrset,
576 struct reply_info** encode_repp, struct auth_zones* az)
578 struct respip_action_info actinfo = {0};
579 actinfo.action = respip_none;
581 if(qinfo->qtype != LDNS_RR_TYPE_A &&
582 qinfo->qtype != LDNS_RR_TYPE_AAAA &&
583 qinfo->qtype != LDNS_RR_TYPE_ANY)
586 if(!respip_rewrite_reply(qinfo, cinfo, rep, encode_repp, &actinfo,
587 alias_rrset, 0, worker->scratchpad, az))
590 /* xxx_deny actions mean dropping the reply, unless the original reply
591 * was redirected to response-ip data. */
592 if((actinfo.action == respip_deny ||
593 actinfo.action == respip_inform_deny) &&
597 /* If address info is returned, it means the action should be an
598 * 'inform' variant and the information should be logged. */
599 if(actinfo.addrinfo) {
600 respip_inform_print(&actinfo, qinfo->qname,
601 qinfo->qtype, qinfo->qclass, qinfo->local_alias,
604 if(worker->stats.extended && actinfo.rpz_used) {
605 if(actinfo.rpz_disabled)
606 worker->stats.rpz_action[RPZ_DISABLED_ACTION]++;
607 if(actinfo.rpz_cname_override)
608 worker->stats.rpz_action[RPZ_CNAME_OVERRIDE_ACTION]++;
610 worker->stats.rpz_action[
611 respip_action_to_rpz_action(actinfo.action)]++;
618 /** answer query from the cache.
619 * Normally, the answer message will be built in repinfo->c->buffer; if the
620 * answer is supposed to be suppressed or the answer is supposed to be an
621 * incomplete CNAME chain, the buffer is explicitly cleared to signal the
622 * caller as such. In the latter case *partial_rep will point to the incomplete
623 * reply, and this function is (possibly) supposed to be called again with that
624 * *partial_rep value to complete the chain. In addition, if the query should
625 * be completely dropped, '*need_drop' will be set to 1. */
627 answer_from_cache(struct worker* worker, struct query_info* qinfo,
628 struct respip_client_info* cinfo, int* need_drop, int* is_expired_answer,
629 int* is_secure_answer, struct ub_packed_rrset_key** alias_rrset,
630 struct reply_info** partial_repp,
631 struct reply_info* rep, uint16_t id, uint16_t flags,
632 struct comm_reply* repinfo, struct edns_data* edns)
634 struct edns_data edns_bak;
635 time_t timenow = *worker->env.now;
636 uint16_t udpsize = edns->udp_size;
637 struct reply_info* encode_rep = rep;
638 struct reply_info* partial_rep = *partial_repp;
639 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
640 && worker->env.need_to_validate;
641 *partial_repp = NULL; /* avoid accidental further pass */
644 if(rep->ttl < timenow) {
645 /* Check if we need to serve expired now */
646 if(worker->env.cfg->serve_expired &&
647 !worker->env.cfg->serve_expired_client_timeout) {
648 if(worker->env.cfg->serve_expired_ttl &&
649 rep->serve_expired_ttl < timenow)
651 if(!rrset_array_lock(rep->ref, rep->rrset_count, 0))
653 *is_expired_answer = 1;
655 /* the rrsets may have been updated in the meantime.
656 * we will refetch the message format from the
657 * authoritative server
662 if(!rrset_array_lock(rep->ref, rep->rrset_count, timenow))
665 /* locked and ids and ttls are OK. */
667 /* check CNAME chain (if any) */
668 if(rep->an_numrrsets > 0 && (rep->rrsets[0]->rk.type ==
669 htons(LDNS_RR_TYPE_CNAME) || rep->rrsets[0]->rk.type ==
670 htons(LDNS_RR_TYPE_DNAME))) {
671 if(!reply_check_cname_chain(qinfo, rep)) {
672 /* cname chain invalid, redo iterator steps */
673 verbose(VERB_ALGO, "Cache reply: cname chain broken");
677 /* check security status of the cached answer */
678 if(must_validate && (rep->security == sec_status_bogus ||
679 rep->security == sec_status_secure_sentinel_fail)) {
681 edns->edns_version = EDNS_ADVERTISED_VERSION;
682 edns->udp_size = EDNS_ADVERTISED_SIZE;
684 edns->bits &= EDNS_DO;
685 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, rep,
686 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
688 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
689 qinfo, id, flags, edns);
690 rrset_array_unlock_touch(worker->env.rrset_cache,
691 worker->scratchpad, rep->ref, rep->rrset_count);
692 if(worker->stats.extended) {
693 worker->stats.ans_bogus ++;
694 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL] ++;
697 } else if(rep->security == sec_status_unchecked && must_validate) {
698 verbose(VERB_ALGO, "Cache reply: unchecked entry needs "
700 goto bail_out; /* need to validate cache entry first */
701 } else if(rep->security == sec_status_secure) {
702 if(reply_all_rrsets_secure(rep)) {
703 *is_secure_answer = 1;
706 verbose(VERB_ALGO, "Cache reply: secure entry"
708 goto bail_out; /* rrset changed, re-verify */
710 *is_secure_answer = 0;
712 } else *is_secure_answer = 0;
715 edns->edns_version = EDNS_ADVERTISED_VERSION;
716 edns->udp_size = EDNS_ADVERTISED_SIZE;
718 edns->bits &= EDNS_DO;
719 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, rep,
720 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad))
722 *alias_rrset = NULL; /* avoid confusion if caller set it to non-NULL */
723 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) &&
724 !partial_rep && !apply_respip_action(worker, qinfo, cinfo, rep,
725 repinfo, alias_rrset,
726 &encode_rep, worker->env.auth_zones)) {
728 } else if(partial_rep &&
729 !respip_merge_cname(partial_rep, qinfo, rep, cinfo,
730 must_validate, &encode_rep, worker->scratchpad,
731 worker->env.auth_zones)) {
734 if(encode_rep != rep) {
735 /* if rewritten, it can't be considered "secure" */
736 *is_secure_answer = 0;
738 if(!encode_rep || *alias_rrset) {
742 /* If a partial CNAME chain is found, we first need to
743 * make a copy of the reply in the scratchpad so we
744 * can release the locks and lookup the cache again. */
745 *partial_repp = reply_info_copy(encode_rep, NULL,
750 } else if(!apply_edns_options(edns, &edns_bak, worker->env.cfg,
751 repinfo->c, worker->scratchpad) ||
752 !reply_info_answer_encode(qinfo, encode_rep, id, flags,
753 repinfo->c->buffer, timenow, 1, worker->scratchpad,
754 udpsize, edns, (int)(edns->bits & EDNS_DO), *is_secure_answer)) {
755 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL,
756 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad))
757 edns->opt_list = NULL;
758 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
759 qinfo, id, flags, edns);
761 /* cannot send the reply right now, because blocking network syscall
762 * is bad while holding locks. */
763 rrset_array_unlock_touch(worker->env.rrset_cache, worker->scratchpad,
764 rep->ref, rep->rrset_count);
765 /* go and return this buffer to the client */
769 rrset_array_unlock_touch(worker->env.rrset_cache,
770 worker->scratchpad, rep->ref, rep->rrset_count);
774 /** Reply to client and perform prefetch to keep cache up to date. */
776 reply_and_prefetch(struct worker* worker, struct query_info* qinfo,
777 uint16_t flags, struct comm_reply* repinfo, time_t leeway, int noreply)
779 /* first send answer to client to keep its latency
780 * as small as a cachereply */
782 if(repinfo->c->tcp_req_info) {
784 repinfo->c->tcp_req_info->spool_buffer,
787 comm_point_send_reply(repinfo);
789 server_stats_prefetch(&worker->stats, worker);
791 /* create the prefetch in the mesh as a normal lookup without
792 * client addrs waiting, which has the cache blacklisted (to bypass
793 * the cache and go to the network for the data). */
794 /* this (potentially) runs the mesh for the new query */
795 mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway +
796 PREFETCH_EXPIRY_ADD);
800 * Fill CH class answer into buffer. Keeps query.
802 * @param str: string to put into text record (<255).
803 * array of strings, every string becomes a text record.
804 * @param num: number of strings in array.
805 * @param edns: edns reply information.
806 * @param worker: worker with scratch region.
807 * @param repinfo: reply information for a communication point.
810 chaos_replystr(sldns_buffer* pkt, char** str, int num, struct edns_data* edns,
811 struct worker* worker, struct comm_reply* repinfo)
814 unsigned int rd = LDNS_RD_WIRE(sldns_buffer_begin(pkt));
815 unsigned int cd = LDNS_CD_WIRE(sldns_buffer_begin(pkt));
816 sldns_buffer_clear(pkt);
817 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip id */
818 sldns_buffer_write_u16(pkt, (uint16_t)(BIT_QR|BIT_RA));
819 if(rd) LDNS_RD_SET(sldns_buffer_begin(pkt));
820 if(cd) LDNS_CD_SET(sldns_buffer_begin(pkt));
821 sldns_buffer_write_u16(pkt, 1); /* qdcount */
822 sldns_buffer_write_u16(pkt, (uint16_t)num); /* ancount */
823 sldns_buffer_write_u16(pkt, 0); /* nscount */
824 sldns_buffer_write_u16(pkt, 0); /* arcount */
825 (void)query_dname_len(pkt); /* skip qname */
826 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qtype */
827 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qclass */
828 for(i=0; i<num; i++) {
829 size_t len = strlen(str[i]);
830 if(len>255) len=255; /* cap size of TXT record */
831 sldns_buffer_write_u16(pkt, 0xc00c); /* compr ptr to query */
832 sldns_buffer_write_u16(pkt, LDNS_RR_TYPE_TXT);
833 sldns_buffer_write_u16(pkt, LDNS_RR_CLASS_CH);
834 sldns_buffer_write_u32(pkt, 0); /* TTL */
835 sldns_buffer_write_u16(pkt, sizeof(uint8_t) + len);
836 sldns_buffer_write_u8(pkt, len);
837 sldns_buffer_write(pkt, str[i], len);
839 sldns_buffer_flip(pkt);
840 edns->edns_version = EDNS_ADVERTISED_VERSION;
841 edns->udp_size = EDNS_ADVERTISED_SIZE;
842 edns->bits &= EDNS_DO;
843 if(!inplace_cb_reply_local_call(&worker->env, NULL, NULL, NULL,
844 LDNS_RCODE_NOERROR, edns, repinfo, worker->scratchpad))
845 edns->opt_list = NULL;
846 if(sldns_buffer_capacity(pkt) >=
847 sldns_buffer_limit(pkt)+calc_edns_field_size(edns))
848 attach_edns_record(pkt, edns);
851 /** Reply with one string */
853 chaos_replyonestr(sldns_buffer* pkt, const char* str, struct edns_data* edns,
854 struct worker* worker, struct comm_reply* repinfo)
856 chaos_replystr(pkt, (char**)&str, 1, edns, worker, repinfo);
860 * Create CH class trustanchor answer.
862 * @param edns: edns reply information.
863 * @param w: worker with scratch region.
864 * @param repinfo: reply information for a communication point.
867 chaos_trustanchor(sldns_buffer* pkt, struct edns_data* edns, struct worker* w,
868 struct comm_reply* repinfo)
870 #define TA_RESPONSE_MAX_TXT 16 /* max number of TXT records */
871 #define TA_RESPONSE_MAX_TAGS 32 /* max number of tags printed per zone */
872 char* str_array[TA_RESPONSE_MAX_TXT];
873 uint16_t tags[TA_RESPONSE_MAX_TAGS];
875 struct trust_anchor* ta;
877 if(!w->env.need_to_validate) {
878 /* no validator module, reply no trustanchors */
879 chaos_replystr(pkt, NULL, 0, edns, w, repinfo);
883 /* fill the string with contents */
884 lock_basic_lock(&w->env.anchors->lock);
885 RBTREE_FOR(ta, struct trust_anchor*, w->env.anchors->tree) {
887 size_t i, numtag, str_len = 255;
888 if(num == TA_RESPONSE_MAX_TXT) continue;
889 str = (char*)regional_alloc(w->scratchpad, str_len);
891 lock_basic_lock(&ta->lock);
892 numtag = anchor_list_keytags(ta, tags, TA_RESPONSE_MAX_TAGS);
894 /* empty, insecure point */
895 lock_basic_unlock(&ta->lock);
898 str_array[num] = str;
901 /* spool name of anchor */
902 (void)sldns_wire2str_dname_buf(ta->name, ta->namelen, str, str_len);
903 str_len -= strlen(str); str += strlen(str);
905 for(i=0; i<numtag; i++) {
906 snprintf(str, str_len, " %u", (unsigned)tags[i]);
907 str_len -= strlen(str); str += strlen(str);
909 lock_basic_unlock(&ta->lock);
911 lock_basic_unlock(&w->env.anchors->lock);
913 chaos_replystr(pkt, str_array, num, edns, w, repinfo);
914 regional_free_all(w->scratchpad);
918 * Answer CH class queries.
920 * @param qinfo: query info. Pointer into packet buffer.
921 * @param edns: edns info from query.
922 * @param repinfo: reply information for a communication point.
923 * @param pkt: packet buffer.
924 * @return: true if a reply is to be sent.
927 answer_chaos(struct worker* w, struct query_info* qinfo,
928 struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* pkt)
930 struct config_file* cfg = w->env.cfg;
931 if(qinfo->qtype != LDNS_RR_TYPE_ANY && qinfo->qtype != LDNS_RR_TYPE_TXT)
933 if(query_dname_compare(qinfo->qname,
934 (uint8_t*)"\002id\006server") == 0 ||
935 query_dname_compare(qinfo->qname,
936 (uint8_t*)"\010hostname\004bind") == 0)
938 if(cfg->hide_identity)
940 if(cfg->identity==NULL || cfg->identity[0]==0) {
941 char buf[MAXHOSTNAMELEN+1];
942 if (gethostname(buf, MAXHOSTNAMELEN) == 0) {
943 buf[MAXHOSTNAMELEN] = 0;
944 chaos_replyonestr(pkt, buf, edns, w, repinfo);
946 log_err("gethostname: %s", strerror(errno));
947 chaos_replyonestr(pkt, "no hostname", edns, w, repinfo);
950 else chaos_replyonestr(pkt, cfg->identity, edns, w, repinfo);
953 if(query_dname_compare(qinfo->qname,
954 (uint8_t*)"\007version\006server") == 0 ||
955 query_dname_compare(qinfo->qname,
956 (uint8_t*)"\007version\004bind") == 0)
958 if(cfg->hide_version)
960 if(cfg->version==NULL || cfg->version[0]==0)
961 chaos_replyonestr(pkt, PACKAGE_STRING, edns, w, repinfo);
962 else chaos_replyonestr(pkt, cfg->version, edns, w, repinfo);
965 if(query_dname_compare(qinfo->qname,
966 (uint8_t*)"\013trustanchor\007unbound") == 0)
968 if(cfg->hide_trustanchor)
970 chaos_trustanchor(pkt, edns, w, repinfo);
978 * Answer notify queries. These are notifies for authoritative zones,
979 * the reply is an ack that the notify has been received. We need to check
980 * access permission here.
982 * @param qinfo: query info. Pointer into packet buffer.
983 * @param edns: edns info from query.
984 * @param repinfo: reply info with source address.
985 * @param pkt: packet buffer.
988 answer_notify(struct worker* w, struct query_info* qinfo,
989 struct edns_data* edns, sldns_buffer* pkt, struct comm_reply* repinfo)
992 int rcode = LDNS_RCODE_NOERROR;
995 if(!w->env.auth_zones) return;
996 has_serial = auth_zone_parse_notify_serial(pkt, &serial);
997 if(auth_zones_notify(w->env.auth_zones, &w->env, qinfo->qname,
998 qinfo->qname_len, qinfo->qclass, &repinfo->addr,
999 repinfo->addrlen, has_serial, serial, &refused)) {
1000 rcode = LDNS_RCODE_NOERROR;
1003 rcode = LDNS_RCODE_REFUSED;
1004 else rcode = LDNS_RCODE_SERVFAIL;
1007 if(verbosity >= VERB_DETAIL) {
1011 dname_str(qinfo->qname, zname);
1014 snprintf(sr, sizeof(sr), "serial %u ",
1016 if(rcode == LDNS_RCODE_REFUSED)
1017 snprintf(buf, sizeof(buf),
1018 "refused NOTIFY %sfor %s from", sr, zname);
1019 else if(rcode == LDNS_RCODE_SERVFAIL)
1020 snprintf(buf, sizeof(buf),
1021 "servfail for NOTIFY %sfor %s from", sr, zname);
1022 else snprintf(buf, sizeof(buf),
1023 "received NOTIFY %sfor %s from", sr, zname);
1024 log_addr(VERB_DETAIL, buf, &repinfo->addr, repinfo->addrlen);
1026 edns->edns_version = EDNS_ADVERTISED_VERSION;
1027 edns->udp_size = EDNS_ADVERTISED_SIZE;
1028 edns->ext_rcode = 0;
1029 edns->bits &= EDNS_DO;
1030 edns->opt_list = NULL;
1031 error_encode(pkt, rcode, qinfo,
1032 *(uint16_t*)(void *)sldns_buffer_begin(pkt),
1033 sldns_buffer_read_u16_at(pkt, 2), edns);
1034 LDNS_OPCODE_SET(sldns_buffer_begin(pkt), LDNS_PACKET_NOTIFY);
1038 deny_refuse(struct comm_point* c, enum acl_access acl,
1039 enum acl_access deny, enum acl_access refuse,
1040 struct worker* worker, struct comm_reply* repinfo)
1043 comm_point_drop_reply(repinfo);
1044 if(worker->stats.extended)
1045 worker->stats.unwanted_queries++;
1047 } else if(acl == refuse) {
1048 log_addr(VERB_ALGO, "refused query from",
1049 &repinfo->addr, repinfo->addrlen);
1050 log_buf(VERB_ALGO, "refuse", c->buffer);
1051 if(worker->stats.extended)
1052 worker->stats.unwanted_queries++;
1053 if(worker_check_request(c->buffer, worker) == -1) {
1054 comm_point_drop_reply(repinfo);
1055 return 0; /* discard this */
1057 sldns_buffer_set_limit(c->buffer, LDNS_HEADER_SIZE);
1058 sldns_buffer_write_at(c->buffer, 4,
1059 (uint8_t*)"\0\0\0\0\0\0\0\0", 8);
1060 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1061 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1062 LDNS_RCODE_REFUSED);
1063 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE);
1064 sldns_buffer_flip(c->buffer);
1072 deny_refuse_all(struct comm_point* c, enum acl_access acl,
1073 struct worker* worker, struct comm_reply* repinfo)
1075 return deny_refuse(c, acl, acl_deny, acl_refuse, worker, repinfo);
1079 deny_refuse_non_local(struct comm_point* c, enum acl_access acl,
1080 struct worker* worker, struct comm_reply* repinfo)
1082 return deny_refuse(c, acl, acl_deny_non_local, acl_refuse_non_local, worker, repinfo);
1086 worker_handle_request(struct comm_point* c, void* arg, int error,
1087 struct comm_reply* repinfo)
1089 struct worker* worker = (struct worker*)arg;
1092 struct lruhash_entry* e;
1093 struct query_info qinfo;
1094 struct edns_data edns;
1095 enum acl_access acl;
1096 struct acl_addr* acladdr;
1099 int is_expired_answer = 0;
1100 int is_secure_answer = 0;
1101 /* We might have to chase a CNAME chain internally, in which case
1102 * we'll have up to two replies and combine them to build a complete
1103 * answer. These variables control this case. */
1104 struct ub_packed_rrset_key* alias_rrset = NULL;
1105 struct reply_info* partial_rep = NULL;
1106 struct query_info* lookup_qinfo = &qinfo;
1107 struct query_info qinfo_tmp; /* placeholder for lookup_qinfo */
1108 struct respip_client_info* cinfo = NULL, cinfo_tmp;
1109 memset(&qinfo, 0, sizeof(qinfo));
1111 if(error != NETEVENT_NOERROR || !repinfo) {
1112 /* some bad tcp query DNS formats give these error calls */
1113 verbose(VERB_ALGO, "handle request called with err=%d", error);
1117 repinfo->max_udp_size = worker->daemon->cfg->max_udp_size;
1118 if(!dnsc_handle_curved_request(worker->daemon->dnscenv, repinfo)) {
1119 worker->stats.num_query_dnscrypt_crypted_malformed++;
1122 if(c->dnscrypt && !repinfo->is_dnscrypted) {
1123 char buf[LDNS_MAX_DOMAINLEN+1];
1124 /* Check if this is unencrypted and asking for certs */
1125 if(worker_check_request(c->buffer, worker) != 0) {
1127 "dnscrypt: worker check request: bad query.");
1128 log_addr(VERB_CLIENT,"from",&repinfo->addr,
1130 comm_point_drop_reply(repinfo);
1133 if(!query_info_parse(&qinfo, c->buffer)) {
1135 "dnscrypt: worker parse request: formerror.");
1136 log_addr(VERB_CLIENT, "from", &repinfo->addr,
1138 comm_point_drop_reply(repinfo);
1141 dname_str(qinfo.qname, buf);
1142 if(!(qinfo.qtype == LDNS_RR_TYPE_TXT &&
1144 worker->daemon->dnscenv->provider_name) == 0)) {
1146 "dnscrypt: not TXT \"%s\". Received: %s \"%s\"",
1147 worker->daemon->dnscenv->provider_name,
1148 sldns_rr_descript(qinfo.qtype)->_name,
1150 comm_point_drop_reply(repinfo);
1151 worker->stats.num_query_dnscrypt_cleartext++;
1154 worker->stats.num_query_dnscrypt_cert++;
1155 sldns_buffer_rewind(c->buffer);
1156 } else if(c->dnscrypt && repinfo->is_dnscrypted) {
1157 worker->stats.num_query_dnscrypt_crypted++;
1161 if(worker->dtenv.log_client_query_messages)
1162 dt_msg_send_client_query(&worker->dtenv, &repinfo->addr, c->type,
1165 acladdr = acl_addr_lookup(worker->daemon->acl, &repinfo->addr,
1167 acl = acl_get_control(acladdr);
1168 if((ret=deny_refuse_all(c, acl, worker, repinfo)) != -1)
1174 if((ret=worker_check_request(c->buffer, worker)) != 0) {
1175 verbose(VERB_ALGO, "worker check request: bad query.");
1176 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1178 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1179 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
1182 comm_point_drop_reply(repinfo);
1186 worker->stats.num_queries++;
1188 /* check if this query should be dropped based on source ip rate limiting */
1189 if(!infra_ip_ratelimit_inc(worker->env.infra_cache, repinfo,
1190 *worker->env.now, c->buffer)) {
1191 /* See if we are passed through with slip factor */
1192 if(worker->env.cfg->ip_ratelimit_factor != 0 &&
1193 ub_random_max(worker->env.rnd,
1194 worker->env.cfg->ip_ratelimit_factor) == 0) {
1197 addr_to_str(&repinfo->addr, repinfo->addrlen,
1198 addrbuf, sizeof(addrbuf));
1199 verbose(VERB_QUERY, "ip_ratelimit allowed through for ip address %s because of slip in ip_ratelimit_factor",
1202 worker->stats.num_queries_ip_ratelimited++;
1203 comm_point_drop_reply(repinfo);
1208 /* see if query is in the cache */
1209 if(!query_info_parse(&qinfo, c->buffer)) {
1210 verbose(VERB_ALGO, "worker parse request: formerror.");
1211 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1212 memset(&qinfo, 0, sizeof(qinfo)); /* zero qinfo.qname */
1213 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) {
1214 comm_point_drop_reply(repinfo);
1217 sldns_buffer_rewind(c->buffer);
1218 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1219 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1220 LDNS_RCODE_FORMERR);
1221 server_stats_insrcode(&worker->stats, c->buffer);
1224 if(worker->env.cfg->log_queries) {
1226 addr_to_str(&repinfo->addr, repinfo->addrlen, ip, sizeof(ip));
1227 log_query_in(ip, qinfo.qname, qinfo.qtype, qinfo.qclass);
1229 if(qinfo.qtype == LDNS_RR_TYPE_AXFR ||
1230 qinfo.qtype == LDNS_RR_TYPE_IXFR) {
1231 verbose(VERB_ALGO, "worker request: refused zone transfer.");
1232 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
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_REFUSED);
1237 if(worker->stats.extended) {
1238 worker->stats.qtype[qinfo.qtype]++;
1239 server_stats_insrcode(&worker->stats, c->buffer);
1243 if(qinfo.qtype == LDNS_RR_TYPE_OPT ||
1244 qinfo.qtype == LDNS_RR_TYPE_TSIG ||
1245 qinfo.qtype == LDNS_RR_TYPE_TKEY ||
1246 qinfo.qtype == LDNS_RR_TYPE_MAILA ||
1247 qinfo.qtype == LDNS_RR_TYPE_MAILB ||
1248 (qinfo.qtype >= 128 && qinfo.qtype <= 248)) {
1249 verbose(VERB_ALGO, "worker request: formerror for meta-type.");
1250 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1251 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) {
1252 comm_point_drop_reply(repinfo);
1255 sldns_buffer_rewind(c->buffer);
1256 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1257 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1258 LDNS_RCODE_FORMERR);
1259 if(worker->stats.extended) {
1260 worker->stats.qtype[qinfo.qtype]++;
1261 server_stats_insrcode(&worker->stats, c->buffer);
1265 if((ret=parse_edns_from_pkt(c->buffer, &edns, worker->scratchpad)) != 0) {
1266 struct edns_data reply_edns;
1267 verbose(VERB_ALGO, "worker parse edns: formerror.");
1268 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1269 memset(&reply_edns, 0, sizeof(reply_edns));
1270 reply_edns.edns_present = 1;
1271 reply_edns.udp_size = EDNS_ADVERTISED_SIZE;
1272 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
1273 error_encode(c->buffer, ret, &qinfo,
1274 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1275 sldns_buffer_read_u16_at(c->buffer, 2), &reply_edns);
1276 regional_free_all(worker->scratchpad);
1277 server_stats_insrcode(&worker->stats, c->buffer);
1280 if(edns.edns_present) {
1281 struct edns_option* edns_opt;
1282 if(edns.edns_version != 0) {
1283 edns.ext_rcode = (uint8_t)(EDNS_RCODE_BADVERS>>4);
1284 edns.edns_version = EDNS_ADVERTISED_VERSION;
1285 edns.udp_size = EDNS_ADVERTISED_SIZE;
1286 edns.bits &= EDNS_DO;
1287 edns.opt_list = NULL;
1288 verbose(VERB_ALGO, "query with bad edns version.");
1289 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1290 error_encode(c->buffer, EDNS_RCODE_BADVERS&0xf, &qinfo,
1291 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1292 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1293 if(sldns_buffer_capacity(c->buffer) >=
1294 sldns_buffer_limit(c->buffer)+calc_edns_field_size(&edns))
1295 attach_edns_record(c->buffer, &edns);
1296 regional_free_all(worker->scratchpad);
1299 if(edns.udp_size < NORMAL_UDP_SIZE &&
1300 worker->daemon->cfg->harden_short_bufsize) {
1301 verbose(VERB_QUERY, "worker request: EDNS bufsize %d ignored",
1302 (int)edns.udp_size);
1303 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1304 edns.udp_size = NORMAL_UDP_SIZE;
1306 if(c->type != comm_udp) {
1307 edns_opt = edns_opt_list_find(edns.opt_list, LDNS_EDNS_KEEPALIVE);
1308 if(edns_opt && edns_opt->opt_len > 0) {
1310 edns.edns_version = EDNS_ADVERTISED_VERSION;
1311 edns.udp_size = EDNS_ADVERTISED_SIZE;
1312 edns.bits &= EDNS_DO;
1313 edns.opt_list = NULL;
1314 verbose(VERB_ALGO, "query with bad edns keepalive.");
1315 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1316 error_encode(c->buffer, LDNS_RCODE_FORMERR, &qinfo,
1317 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1318 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1319 if(sldns_buffer_capacity(c->buffer) >=
1320 sldns_buffer_limit(c->buffer)+calc_edns_field_size(&edns))
1321 attach_edns_record(c->buffer, &edns);
1322 regional_free_all(worker->scratchpad);
1327 if(edns.udp_size > worker->daemon->cfg->max_udp_size &&
1328 c->type == comm_udp) {
1330 "worker request: max UDP reply size modified"
1331 " (%d to max-udp-size)", (int)edns.udp_size);
1332 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
1333 edns.udp_size = worker->daemon->cfg->max_udp_size;
1335 if(edns.udp_size < LDNS_HEADER_SIZE) {
1336 verbose(VERB_ALGO, "worker request: edns is too small.");
1337 log_addr(VERB_CLIENT, "from", &repinfo->addr, repinfo->addrlen);
1338 LDNS_QR_SET(sldns_buffer_begin(c->buffer));
1339 LDNS_TC_SET(sldns_buffer_begin(c->buffer));
1340 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
1341 LDNS_RCODE_SERVFAIL);
1342 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE);
1343 sldns_buffer_write_at(c->buffer, 4,
1344 (uint8_t*)"\0\0\0\0\0\0\0\0", 8);
1345 sldns_buffer_flip(c->buffer);
1346 regional_free_all(worker->scratchpad);
1349 if(worker->stats.extended)
1350 server_stats_insquery(&worker->stats, c, qinfo.qtype,
1351 qinfo.qclass, &edns, repinfo);
1352 if(c->type != comm_udp)
1353 edns.udp_size = 65535; /* max size for TCP replies */
1354 if(qinfo.qclass == LDNS_RR_CLASS_CH && answer_chaos(worker, &qinfo,
1355 &edns, repinfo, c->buffer)) {
1356 server_stats_insrcode(&worker->stats, c->buffer);
1357 regional_free_all(worker->scratchpad);
1360 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
1361 LDNS_PACKET_NOTIFY) {
1362 answer_notify(worker, &qinfo, &edns, c->buffer, repinfo);
1363 regional_free_all(worker->scratchpad);
1366 if(local_zones_answer(worker->daemon->local_zones, &worker->env, &qinfo,
1367 &edns, c->buffer, worker->scratchpad, repinfo, acladdr->taglist,
1368 acladdr->taglen, acladdr->tag_actions,
1369 acladdr->tag_actions_size, acladdr->tag_datas,
1370 acladdr->tag_datas_size, worker->daemon->cfg->tagname,
1371 worker->daemon->cfg->num_tags, acladdr->view)) {
1372 regional_free_all(worker->scratchpad);
1373 if(sldns_buffer_limit(c->buffer) == 0) {
1374 comm_point_drop_reply(repinfo);
1377 server_stats_insrcode(&worker->stats, c->buffer);
1380 if(worker->env.auth_zones &&
1381 rpz_apply_qname_trigger(worker->env.auth_zones,
1382 &worker->env, &qinfo, &edns, c->buffer, worker->scratchpad,
1383 repinfo, acladdr->taglist, acladdr->taglen, &worker->stats)) {
1384 regional_free_all(worker->scratchpad);
1385 if(sldns_buffer_limit(c->buffer) == 0) {
1386 comm_point_drop_reply(repinfo);
1389 server_stats_insrcode(&worker->stats, c->buffer);
1392 if(worker->env.auth_zones &&
1393 auth_zones_answer(worker->env.auth_zones, &worker->env,
1394 &qinfo, &edns, repinfo, c->buffer, worker->scratchpad)) {
1395 regional_free_all(worker->scratchpad);
1396 if(sldns_buffer_limit(c->buffer) == 0) {
1397 comm_point_drop_reply(repinfo);
1400 /* set RA for everyone that can have recursion (based on
1401 * access control list) */
1402 if(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer)) &&
1403 acl != acl_deny_non_local && acl != acl_refuse_non_local)
1404 LDNS_RA_SET(sldns_buffer_begin(c->buffer));
1405 server_stats_insrcode(&worker->stats, c->buffer);
1409 /* We've looked in our local zones. If the answer isn't there, we
1410 * might need to bail out based on ACLs now. */
1411 if((ret=deny_refuse_non_local(c, acl, worker, repinfo)) != -1)
1413 regional_free_all(worker->scratchpad);
1419 /* If this request does not have the recursion bit set, verify
1420 * ACLs allow the recursion bit to be treated as set. */
1421 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) &&
1422 acl == acl_allow_setrd ) {
1423 LDNS_RD_SET(sldns_buffer_begin(c->buffer));
1426 /* If this request does not have the recursion bit set, verify
1427 * ACLs allow the snooping. */
1428 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) &&
1429 acl != acl_allow_snoop ) {
1430 error_encode(c->buffer, LDNS_RCODE_REFUSED, &qinfo,
1431 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1432 sldns_buffer_read_u16_at(c->buffer, 2), NULL);
1433 regional_free_all(worker->scratchpad);
1434 server_stats_insrcode(&worker->stats, c->buffer);
1435 log_addr(VERB_ALGO, "refused nonrec (cache snoop) query from",
1436 &repinfo->addr, repinfo->addrlen);
1440 /* If we've found a local alias, replace the qname with the alias
1441 * target before resolving it. */
1442 if(qinfo.local_alias) {
1443 struct ub_packed_rrset_key* rrset = qinfo.local_alias->rrset;
1444 struct packed_rrset_data* d = rrset->entry.data;
1446 /* Sanity check: our current implementation only supports
1447 * a single CNAME RRset as a local alias. */
1448 if(qinfo.local_alias->next ||
1449 rrset->rk.type != htons(LDNS_RR_TYPE_CNAME) ||
1451 log_err("assumption failure: unexpected local alias");
1452 regional_free_all(worker->scratchpad);
1453 return 0; /* drop it */
1455 qinfo.qname = d->rr_data[0] + 2;
1456 qinfo.qname_len = d->rr_len[0] - 2;
1459 /* If we may apply IP-based actions to the answer, build the client
1460 * information. As this can be expensive, skip it if there is
1461 * absolutely no possibility of it. */
1462 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) &&
1463 (qinfo.qtype == LDNS_RR_TYPE_A ||
1464 qinfo.qtype == LDNS_RR_TYPE_AAAA ||
1465 qinfo.qtype == LDNS_RR_TYPE_ANY)) {
1466 cinfo_tmp.taglist = acladdr->taglist;
1467 cinfo_tmp.taglen = acladdr->taglen;
1468 cinfo_tmp.tag_actions = acladdr->tag_actions;
1469 cinfo_tmp.tag_actions_size = acladdr->tag_actions_size;
1470 cinfo_tmp.tag_datas = acladdr->tag_datas;
1471 cinfo_tmp.tag_datas_size = acladdr->tag_datas_size;
1472 cinfo_tmp.view = acladdr->view;
1473 cinfo_tmp.respip_set = worker->daemon->respip_set;
1478 /* Lookup the cache. In case we chase an intermediate CNAME chain
1479 * this is a two-pass operation, and lookup_qinfo is different for
1480 * each pass. We should still pass the original qinfo to
1481 * answer_from_cache(), however, since it's used to build the reply. */
1482 if(!edns_bypass_cache_stage(edns.opt_list, &worker->env)) {
1483 is_expired_answer = 0;
1484 is_secure_answer = 0;
1485 h = query_info_hash(lookup_qinfo, sldns_buffer_read_u16_at(c->buffer, 2));
1486 if((e=slabhash_lookup(worker->env.msg_cache, h, lookup_qinfo, 0))) {
1487 /* answer from cache - we have acquired a readlock on it */
1488 if(answer_from_cache(worker, &qinfo,
1489 cinfo, &need_drop, &is_expired_answer, &is_secure_answer,
1490 &alias_rrset, &partial_rep, (struct reply_info*)e->data,
1491 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1492 sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
1494 /* prefetch it if the prefetch TTL expired.
1495 * Note that if there is more than one pass
1496 * its qname must be that used for cache
1498 if((worker->env.cfg->prefetch && *worker->env.now >=
1499 ((struct reply_info*)e->data)->prefetch_ttl) ||
1500 (worker->env.cfg->serve_expired &&
1501 *worker->env.now >= ((struct reply_info*)e->data)->ttl)) {
1503 time_t leeway = ((struct reply_info*)e->
1504 data)->ttl - *worker->env.now;
1505 if(((struct reply_info*)e->data)->ttl
1508 lock_rw_unlock(&e->lock);
1509 reply_and_prefetch(worker, lookup_qinfo,
1510 sldns_buffer_read_u16_at(c->buffer, 2),
1512 (partial_rep || need_drop));
1515 regional_free_all(worker->scratchpad);
1518 } else if(!partial_rep) {
1519 lock_rw_unlock(&e->lock);
1520 regional_free_all(worker->scratchpad);
1523 /* Note that we've already released the
1524 * lock if we're here after prefetch. */
1525 lock_rw_unlock(&e->lock);
1527 /* We've found a partial reply ending with an
1528 * alias. Replace the lookup qinfo for the
1529 * alias target and lookup the cache again to
1530 * (possibly) complete the reply. As we're
1531 * passing the "base" reply, there will be no
1532 * more alias chasing. */
1533 memset(&qinfo_tmp, 0, sizeof(qinfo_tmp));
1534 get_cname_target(alias_rrset, &qinfo_tmp.qname,
1535 &qinfo_tmp.qname_len);
1536 if(!qinfo_tmp.qname) {
1537 log_err("unexpected: invalid answer alias");
1538 regional_free_all(worker->scratchpad);
1539 return 0; /* drop query */
1541 qinfo_tmp.qtype = qinfo.qtype;
1542 qinfo_tmp.qclass = qinfo.qclass;
1543 lookup_qinfo = &qinfo_tmp;
1546 verbose(VERB_ALGO, "answer from the cache failed");
1547 lock_rw_unlock(&e->lock);
1549 if(!LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) {
1550 if(answer_norec_from_cache(worker, &qinfo,
1551 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
1552 sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
1554 regional_free_all(worker->scratchpad);
1557 verbose(VERB_ALGO, "answer norec from cache -- "
1558 "need to validate or not primed");
1561 sldns_buffer_rewind(c->buffer);
1562 server_stats_querymiss(&worker->stats, worker);
1564 if(verbosity >= VERB_CLIENT) {
1565 if(c->type == comm_udp)
1566 log_addr(VERB_CLIENT, "udp request from",
1567 &repinfo->addr, repinfo->addrlen);
1568 else log_addr(VERB_CLIENT, "tcp request from",
1569 &repinfo->addr, repinfo->addrlen);
1572 /* grab a work request structure for this new request */
1573 mesh_new_client(worker->env.mesh, &qinfo, cinfo,
1574 sldns_buffer_read_u16_at(c->buffer, 2),
1575 &edns, repinfo, *(uint16_t*)(void *)sldns_buffer_begin(c->buffer));
1576 regional_free_all(worker->scratchpad);
1577 worker_mem_report(worker, NULL);
1584 comm_point_drop_reply(repinfo);
1587 if(is_expired_answer) {
1588 worker->stats.ans_expired++;
1590 if(worker->stats.extended) {
1591 if(is_secure_answer) worker->stats.ans_secure++;
1592 server_stats_insrcode(&worker->stats, repinfo->c->buffer);
1595 if(worker->dtenv.log_client_response_messages)
1596 dt_msg_send_client_response(&worker->dtenv, &repinfo->addr,
1597 c->type, c->buffer);
1599 if(worker->env.cfg->log_replies)
1602 memset(&tv, 0, sizeof(tv));
1603 if(qinfo.local_alias && qinfo.local_alias->rrset &&
1604 qinfo.local_alias->rrset->rk.dname) {
1605 /* log original qname, before the local alias was
1606 * used to resolve that CNAME to something else */
1607 qinfo.qname = qinfo.local_alias->rrset->rk.dname;
1608 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen,
1611 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen,
1616 if(!dnsc_handle_uncurved_request(repinfo)) {
1624 worker_sighandler(int sig, void* arg)
1626 /* note that log, print, syscalls here give race conditions.
1627 * And cause hangups if the log-lock is held by the application. */
1628 struct worker* worker = (struct worker*)arg;
1632 comm_base_exit(worker->base);
1636 worker->need_to_exit = 1;
1637 comm_base_exit(worker->base);
1641 worker->need_to_exit = 1;
1642 comm_base_exit(worker->base);
1646 worker->need_to_exit = 1;
1647 comm_base_exit(worker->base);
1650 /* unknown signal, ignored */
1655 /** restart statistics timer for worker, if enabled */
1657 worker_restart_timer(struct worker* worker)
1659 if(worker->env.cfg->stat_interval > 0) {
1662 tv.tv_sec = worker->env.cfg->stat_interval;
1665 comm_timer_set(worker->stat_timer, &tv);
1669 void worker_stat_timer_cb(void* arg)
1671 struct worker* worker = (struct worker*)arg;
1672 server_stats_log(&worker->stats, worker, worker->thread_num);
1673 mesh_stats(worker->env.mesh, "mesh has");
1674 worker_mem_report(worker, NULL);
1675 /* SHM is enabled, process data to SHM */
1676 if (worker->daemon->cfg->shm_enable) {
1677 shm_main_run(worker);
1679 if(!worker->daemon->cfg->stat_cumulative) {
1680 worker_stats_clear(worker);
1682 /* start next timer */
1683 worker_restart_timer(worker);
1686 void worker_probe_timer_cb(void* arg)
1688 struct worker* worker = (struct worker*)arg;
1691 tv.tv_sec = (time_t)autr_probe_timer(&worker->env);
1695 comm_timer_set(worker->env.probe_timer, &tv);
1699 worker_create(struct daemon* daemon, int id, int* ports, int n)
1702 struct worker* worker = (struct worker*)calloc(1,
1703 sizeof(struct worker));
1706 worker->numports = n;
1707 worker->ports = (int*)memdup(ports, sizeof(int)*n);
1708 if(!worker->ports) {
1712 worker->daemon = daemon;
1713 worker->thread_num = id;
1714 if(!(worker->cmd = tube_create())) {
1715 free(worker->ports);
1719 /* create random state here to avoid locking trouble in RAND_bytes */
1720 if(!(worker->rndstate = ub_initstate(daemon->rand))) {
1721 log_err("could not init random numbers.");
1722 tube_delete(worker->cmd);
1723 free(worker->ports);
1727 explicit_bzero(&seed, sizeof(seed));
1729 if(daemon->cfg->dnstap) {
1730 log_assert(daemon->dtenv != NULL);
1731 memcpy(&worker->dtenv, daemon->dtenv, sizeof(struct dt_env));
1732 if(!dt_init(&worker->dtenv))
1733 fatal_exit("dt_init failed");
1740 worker_init(struct worker* worker, struct config_file *cfg,
1741 struct listen_port* ports, int do_sigs)
1744 struct dt_env* dtenv = &worker->dtenv;
1748 worker->need_to_exit = 0;
1749 worker->base = comm_base_create(do_sigs);
1751 log_err("could not create event handling base");
1752 worker_delete(worker);
1755 comm_base_set_slow_accept_handlers(worker->base, &worker_stop_accept,
1756 &worker_start_accept, worker);
1759 ub_thread_sig_unblock(SIGHUP);
1761 ub_thread_sig_unblock(SIGINT);
1763 ub_thread_sig_unblock(SIGQUIT);
1765 ub_thread_sig_unblock(SIGTERM);
1766 #ifndef LIBEVENT_SIGNAL_PROBLEM
1767 worker->comsig = comm_signal_create(worker->base,
1768 worker_sighandler, worker);
1771 || !comm_signal_bind(worker->comsig, SIGHUP)
1774 || !comm_signal_bind(worker->comsig, SIGQUIT)
1776 || !comm_signal_bind(worker->comsig, SIGTERM)
1777 || !comm_signal_bind(worker->comsig, SIGINT)) {
1778 log_err("could not create signal handlers");
1779 worker_delete(worker);
1782 #endif /* LIBEVENT_SIGNAL_PROBLEM */
1783 if(!daemon_remote_open_accept(worker->daemon->rc,
1784 worker->daemon->rc_ports, worker)) {
1785 worker_delete(worker);
1788 #ifdef UB_ON_WINDOWS
1789 wsvc_setup_worker(worker);
1790 #endif /* UB_ON_WINDOWS */
1791 } else { /* !do_sigs */
1792 worker->comsig = NULL;
1794 worker->front = listen_create(worker->base, ports,
1795 cfg->msg_buffer_size, (int)cfg->incoming_num_tcp,
1796 cfg->do_tcp_keepalive
1797 ? cfg->tcp_keepalive_timeout
1798 : cfg->tcp_idle_timeout,
1799 worker->daemon->tcl,
1800 worker->daemon->listen_sslctx,
1801 dtenv, worker_handle_request, worker);
1802 if(!worker->front) {
1803 log_err("could not create listening sockets");
1804 worker_delete(worker);
1807 worker->back = outside_network_create(worker->base,
1808 cfg->msg_buffer_size, (size_t)cfg->outgoing_num_ports,
1809 cfg->out_ifs, cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6,
1810 cfg->do_tcp?cfg->outgoing_num_tcp:0,
1811 worker->daemon->env->infra_cache, worker->rndstate,
1812 cfg->use_caps_bits_for_id, worker->ports, worker->numports,
1813 cfg->unwanted_threshold, cfg->outgoing_tcp_mss,
1814 &worker_alloc_cleanup, worker,
1815 cfg->do_udp || cfg->udp_upstream_without_downstream,
1816 worker->daemon->connect_sslctx, cfg->delay_close,
1819 log_err("could not create outgoing sockets");
1820 worker_delete(worker);
1823 /* start listening to commands */
1824 if(!tube_setup_bg_listen(worker->cmd, worker->base,
1825 &worker_handle_control_cmd, worker)) {
1826 log_err("could not create control compt.");
1827 worker_delete(worker);
1830 worker->stat_timer = comm_timer_create(worker->base,
1831 worker_stat_timer_cb, worker);
1832 if(!worker->stat_timer) {
1833 log_err("could not create statistics timer");
1836 /* we use the msg_buffer_size as a good estimate for what the
1837 * user wants for memory usage sizes */
1838 worker->scratchpad = regional_create_custom(cfg->msg_buffer_size);
1839 if(!worker->scratchpad) {
1840 log_err("malloc failure");
1841 worker_delete(worker);
1845 server_stats_init(&worker->stats, cfg);
1846 alloc_init(&worker->alloc, &worker->daemon->superalloc,
1847 worker->thread_num);
1848 alloc_set_id_cleanup(&worker->alloc, &worker_alloc_cleanup, worker);
1849 worker->env = *worker->daemon->env;
1850 comm_base_timept(worker->base, &worker->env.now, &worker->env.now_tv);
1851 worker->env.worker = worker;
1852 worker->env.worker_base = worker->base;
1853 worker->env.send_query = &worker_send_query;
1854 worker->env.alloc = &worker->alloc;
1855 worker->env.outnet = worker->back;
1856 worker->env.rnd = worker->rndstate;
1857 /* If case prefetch is triggered, the corresponding mesh will clear
1858 * the scratchpad for the module env in the middle of request handling.
1859 * It would be prone to a use-after-free kind of bug, so we avoid
1860 * sharing it with worker's own scratchpad at the cost of having
1861 * one more pad per worker. */
1862 worker->env.scratch = regional_create_custom(cfg->msg_buffer_size);
1863 if(!worker->env.scratch) {
1864 log_err("malloc failure");
1865 worker_delete(worker);
1868 worker->env.mesh = mesh_create(&worker->daemon->mods, &worker->env);
1869 /* Pass on daemon variables that we would need in the mesh area */
1870 worker->env.mesh->use_response_ip = worker->daemon->use_response_ip;
1871 worker->env.mesh->use_rpz = worker->daemon->use_rpz;
1873 worker->env.detach_subs = &mesh_detach_subs;
1874 worker->env.attach_sub = &mesh_attach_sub;
1875 worker->env.add_sub = &mesh_add_sub;
1876 worker->env.kill_sub = &mesh_state_delete;
1877 worker->env.detect_cycle = &mesh_detect_cycle;
1878 worker->env.scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size);
1879 if(!(worker->env.fwds = forwards_create()) ||
1880 !forwards_apply_cfg(worker->env.fwds, cfg)) {
1881 log_err("Could not set forward zones");
1882 worker_delete(worker);
1885 if(!(worker->env.hints = hints_create()) ||
1886 !hints_apply_cfg(worker->env.hints, cfg)) {
1887 log_err("Could not set root or stub hints");
1888 worker_delete(worker);
1891 /* one probe timer per process -- if we have 5011 anchors */
1892 if(autr_get_num_anchors(worker->env.anchors) > 0
1893 #ifndef THREADS_DISABLED
1894 && worker->thread_num == 0
1900 worker->env.probe_timer = comm_timer_create(worker->base,
1901 worker_probe_timer_cb, worker);
1902 if(!worker->env.probe_timer) {
1903 log_err("could not create 5011-probe timer");
1905 /* let timer fire, then it can reset itself */
1906 comm_timer_set(worker->env.probe_timer, &tv);
1909 /* zone transfer tasks, setup once per process, if any */
1910 if(worker->env.auth_zones
1911 #ifndef THREADS_DISABLED
1912 && worker->thread_num == 0
1915 auth_xfer_pickup_initial(worker->env.auth_zones, &worker->env);
1917 if(!worker->env.mesh || !worker->env.scratch_buffer) {
1918 worker_delete(worker);
1921 worker_mem_report(worker, NULL);
1922 /* if statistics enabled start timer */
1923 if(worker->env.cfg->stat_interval > 0) {
1924 verbose(VERB_ALGO, "set statistics interval %d secs",
1925 worker->env.cfg->stat_interval);
1926 worker_restart_timer(worker);
1932 worker_work(struct worker* worker)
1934 comm_base_dispatch(worker->base);
1938 worker_delete(struct worker* worker)
1942 if(worker->env.mesh && verbosity >= VERB_OPS) {
1943 server_stats_log(&worker->stats, worker, worker->thread_num);
1944 mesh_stats(worker->env.mesh, "mesh has");
1945 worker_mem_report(worker, NULL);
1947 outside_network_quit_prepare(worker->back);
1948 mesh_delete(worker->env.mesh);
1949 sldns_buffer_free(worker->env.scratch_buffer);
1950 forwards_delete(worker->env.fwds);
1951 hints_delete(worker->env.hints);
1952 listen_delete(worker->front);
1953 outside_network_delete(worker->back);
1954 comm_signal_delete(worker->comsig);
1955 tube_delete(worker->cmd);
1956 comm_timer_delete(worker->stat_timer);
1957 comm_timer_delete(worker->env.probe_timer);
1958 free(worker->ports);
1959 if(worker->thread_num == 0) {
1960 #ifdef UB_ON_WINDOWS
1961 wsvc_desetup_worker(worker);
1962 #endif /* UB_ON_WINDOWS */
1964 comm_base_delete(worker->base);
1965 ub_randfree(worker->rndstate);
1966 alloc_clear(&worker->alloc);
1967 regional_destroy(worker->env.scratch);
1968 regional_destroy(worker->scratchpad);
1972 struct outbound_entry*
1973 worker_send_query(struct query_info* qinfo, uint16_t flags, int dnssec,
1974 int want_dnssec, int nocaps, struct sockaddr_storage* addr,
1975 socklen_t addrlen, uint8_t* zone, size_t zonelen, int ssl_upstream,
1976 char* tls_auth_name, struct module_qstate* q)
1978 struct worker* worker = q->env->worker;
1979 struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
1980 q->region, sizeof(*e));
1984 e->qsent = outnet_serviced_query(worker->back, qinfo, flags, dnssec,
1985 want_dnssec, nocaps, q->env->cfg->tcp_upstream,
1986 ssl_upstream, tls_auth_name, addr, addrlen, zone, zonelen, q,
1987 worker_handle_service_reply, e, worker->back->udp_buff, q->env);
1995 worker_alloc_cleanup(void* arg)
1997 struct worker* worker = (struct worker*)arg;
1998 slabhash_clear(&worker->env.rrset_cache->table);
1999 slabhash_clear(worker->env.msg_cache);
2002 void worker_stats_clear(struct worker* worker)
2004 server_stats_init(&worker->stats, worker->env.cfg);
2005 mesh_stats_clear(worker->env.mesh);
2006 worker->back->unwanted_replies = 0;
2007 worker->back->num_tcp_outgoing = 0;
2010 void worker_start_accept(void* arg)
2012 struct worker* worker = (struct worker*)arg;
2013 listen_start_accept(worker->front);
2014 if(worker->thread_num == 0)
2015 daemon_remote_start_accept(worker->daemon->rc);
2018 void worker_stop_accept(void* arg)
2020 struct worker* worker = (struct worker*)arg;
2021 listen_stop_accept(worker->front);
2022 if(worker->thread_num == 0)
2023 daemon_remote_stop_accept(worker->daemon->rc);
2026 /* --- fake callbacks for fptr_wlist to work --- */
2027 struct outbound_entry* libworker_send_query(
2028 struct query_info* ATTR_UNUSED(qinfo),
2029 uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec),
2030 int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps),
2031 struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen),
2032 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen),
2033 int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name),
2034 struct module_qstate* ATTR_UNUSED(q))
2040 int libworker_handle_reply(struct comm_point* ATTR_UNUSED(c),
2041 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
2042 struct comm_reply* ATTR_UNUSED(reply_info))
2048 int libworker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
2049 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
2050 struct comm_reply* ATTR_UNUSED(reply_info))
2056 void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
2057 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
2058 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
2063 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2064 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2065 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2070 void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2071 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2072 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2077 void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
2078 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
2079 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
2084 int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
2090 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
2096 int codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))