1 /* 2 * daemon/worker.c - worker that handles a pending list of requests. 3 * 4 * Copyright (c) 2007, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file implements the worker that handles callbacks on events, for 40 * pending requests. 41 */ 42 #include "config.h" 43 #include "util/log.h" 44 #include "util/net_help.h" 45 #include "util/random.h" 46 #include "daemon/worker.h" 47 #include "daemon/daemon.h" 48 #include "daemon/remote.h" 49 #include "daemon/acl_list.h" 50 #include "util/netevent.h" 51 #include "util/config_file.h" 52 #include "util/module.h" 53 #include "util/regional.h" 54 #include "util/storage/slabhash.h" 55 #include "services/listen_dnsport.h" 56 #include "services/outside_network.h" 57 #include "services/outbound_list.h" 58 #include "services/cache/rrset.h" 59 #include "services/cache/infra.h" 60 #include "services/cache/dns.h" 61 #include "services/authzone.h" 62 #include "services/mesh.h" 63 #include "services/localzone.h" 64 #include "services/rpz.h" 65 #include "util/data/msgparse.h" 66 #include "util/data/msgencode.h" 67 #include "util/data/dname.h" 68 #include "util/fptr_wlist.h" 69 #include "util/tube.h" 70 #include "util/edns.h" 71 #include "iterator/iter_fwd.h" 72 #include "iterator/iter_hints.h" 73 #include "iterator/iter_utils.h" 74 #include "validator/autotrust.h" 75 #include "validator/val_anchor.h" 76 #include "respip/respip.h" 77 #include "libunbound/context.h" 78 #include "libunbound/libworker.h" 79 #include "sldns/sbuffer.h" 80 #include "sldns/wire2str.h" 81 #include "util/shm_side/shm_main.h" 82 #include "dnscrypt/dnscrypt.h" 83 #include "dnstap/dtstream.h" 84 85 #ifdef HAVE_SYS_TYPES_H 86 # include <sys/types.h> 87 #endif 88 #ifdef HAVE_NETDB_H 89 #include <netdb.h> 90 #endif 91 #include <signal.h> 92 #ifdef UB_ON_WINDOWS 93 #include "winrc/win_svc.h" 94 #endif 95 96 /** Size of an UDP datagram */ 97 #define NORMAL_UDP_SIZE 512 /* bytes */ 98 /** ratelimit for error responses */ 99 #define ERROR_RATELIMIT 100 /* qps */ 100 101 /** 102 * seconds to add to prefetch leeway. This is a TTL that expires old rrsets 103 * earlier than they should in order to put the new update into the cache. 104 * This additional value is to make sure that if not all TTLs are equal in 105 * the message to be updated(and replaced), that rrsets with up to this much 106 * extra TTL are also replaced. This means that the resulting new message 107 * will have (most likely) this TTL at least, avoiding very small 'split 108 * second' TTLs due to operators choosing relative primes for TTLs (or so). 109 * Also has to be at least one to break ties (and overwrite cached entry). 110 */ 111 #define PREFETCH_EXPIRY_ADD 60 112 113 /** Report on memory usage by this thread and global */ 114 static void 115 worker_mem_report(struct worker* ATTR_UNUSED(worker), 116 struct serviced_query* ATTR_UNUSED(cur_serv)) 117 { 118 #ifdef UNBOUND_ALLOC_STATS 119 /* measure memory leakage */ 120 extern size_t unbound_mem_alloc, unbound_mem_freed; 121 /* debug func in validator module */ 122 size_t total, front, back, mesh, msg, rrset, infra, ac, superac; 123 size_t me, iter, val, anch; 124 int i; 125 #ifdef CLIENT_SUBNET 126 size_t subnet = 0; 127 #endif /* CLIENT_SUBNET */ 128 if(verbosity < VERB_ALGO) 129 return; 130 front = listen_get_mem(worker->front); 131 back = outnet_get_mem(worker->back); 132 msg = slabhash_get_mem(worker->env.msg_cache); 133 rrset = slabhash_get_mem(&worker->env.rrset_cache->table); 134 infra = infra_get_mem(worker->env.infra_cache); 135 mesh = mesh_get_mem(worker->env.mesh); 136 ac = alloc_get_mem(&worker->alloc); 137 superac = alloc_get_mem(&worker->daemon->superalloc); 138 anch = anchors_get_mem(worker->env.anchors); 139 iter = 0; 140 val = 0; 141 for(i=0; i<worker->env.mesh->mods.num; i++) { 142 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh-> 143 mods.mod[i]->get_mem)); 144 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0) 145 val += (*worker->env.mesh->mods.mod[i]->get_mem) 146 (&worker->env, i); 147 #ifdef CLIENT_SUBNET 148 else if(strcmp(worker->env.mesh->mods.mod[i]->name, 149 "subnetcache")==0) 150 subnet += (*worker->env.mesh->mods.mod[i]->get_mem) 151 (&worker->env, i); 152 #endif /* CLIENT_SUBNET */ 153 else iter += (*worker->env.mesh->mods.mod[i]->get_mem) 154 (&worker->env, i); 155 } 156 me = sizeof(*worker) + sizeof(*worker->base) + sizeof(*worker->comsig) 157 + comm_point_get_mem(worker->cmd_com) 158 + sizeof(worker->rndstate) 159 + regional_get_mem(worker->scratchpad) 160 + sizeof(*worker->env.scratch_buffer) 161 + sldns_buffer_capacity(worker->env.scratch_buffer) 162 + forwards_get_mem(worker->env.fwds) 163 + hints_get_mem(worker->env.hints); 164 if(worker->thread_num == 0) 165 me += acl_list_get_mem(worker->daemon->acl); 166 if(cur_serv) { 167 me += serviced_get_mem(cur_serv); 168 } 169 total = front+back+mesh+msg+rrset+infra+iter+val+ac+superac+me; 170 #ifdef CLIENT_SUBNET 171 total += subnet; 172 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u " 173 "rrset=%u infra=%u iter=%u val=%u subnet=%u anchors=%u " 174 "alloccache=%u globalalloccache=%u me=%u", 175 (unsigned)total, (unsigned)front, (unsigned)back, 176 (unsigned)mesh, (unsigned)msg, (unsigned)rrset, (unsigned)infra, 177 (unsigned)iter, (unsigned)val, 178 (unsigned)subnet, (unsigned)anch, (unsigned)ac, 179 (unsigned)superac, (unsigned)me); 180 #else /* no CLIENT_SUBNET */ 181 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u " 182 "rrset=%u infra=%u iter=%u val=%u anchors=%u " 183 "alloccache=%u globalalloccache=%u me=%u", 184 (unsigned)total, (unsigned)front, (unsigned)back, 185 (unsigned)mesh, (unsigned)msg, (unsigned)rrset, 186 (unsigned)infra, (unsigned)iter, (unsigned)val, (unsigned)anch, 187 (unsigned)ac, (unsigned)superac, (unsigned)me); 188 #endif /* CLIENT_SUBNET */ 189 log_info("Total heap memory estimate: %u total-alloc: %u " 190 "total-free: %u", (unsigned)total, 191 (unsigned)unbound_mem_alloc, (unsigned)unbound_mem_freed); 192 #else /* no UNBOUND_ALLOC_STATS */ 193 size_t val = 0; 194 #ifdef CLIENT_SUBNET 195 size_t subnet = 0; 196 #endif /* CLIENT_SUBNET */ 197 int i; 198 if(verbosity < VERB_QUERY) 199 return; 200 for(i=0; i<worker->env.mesh->mods.num; i++) { 201 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh-> 202 mods.mod[i]->get_mem)); 203 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0) 204 val += (*worker->env.mesh->mods.mod[i]->get_mem) 205 (&worker->env, i); 206 #ifdef CLIENT_SUBNET 207 else if(strcmp(worker->env.mesh->mods.mod[i]->name, 208 "subnetcache")==0) 209 subnet += (*worker->env.mesh->mods.mod[i]->get_mem) 210 (&worker->env, i); 211 #endif /* CLIENT_SUBNET */ 212 } 213 #ifdef CLIENT_SUBNET 214 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u " 215 "subnet=%u", 216 (unsigned)slabhash_get_mem(worker->env.msg_cache), 217 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table), 218 (unsigned)infra_get_mem(worker->env.infra_cache), 219 (unsigned)val, (unsigned)subnet); 220 #else /* no CLIENT_SUBNET */ 221 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u", 222 (unsigned)slabhash_get_mem(worker->env.msg_cache), 223 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table), 224 (unsigned)infra_get_mem(worker->env.infra_cache), 225 (unsigned)val); 226 #endif /* CLIENT_SUBNET */ 227 #endif /* UNBOUND_ALLOC_STATS */ 228 } 229 230 void 231 worker_send_cmd(struct worker* worker, enum worker_commands cmd) 232 { 233 uint32_t c = (uint32_t)htonl(cmd); 234 if(!tube_write_msg(worker->cmd, (uint8_t*)&c, sizeof(c), 0)) { 235 log_err("worker send cmd %d failed", (int)cmd); 236 } 237 } 238 239 int 240 worker_handle_service_reply(struct comm_point* c, void* arg, int error, 241 struct comm_reply* reply_info) 242 { 243 struct outbound_entry* e = (struct outbound_entry*)arg; 244 struct worker* worker = e->qstate->env->worker; 245 struct serviced_query *sq = e->qsent; 246 247 verbose(VERB_ALGO, "worker svcd callback for qstate %p", e->qstate); 248 if(error != 0) { 249 mesh_report_reply(worker->env.mesh, e, reply_info, error); 250 worker_mem_report(worker, sq); 251 return 0; 252 } 253 /* sanity check. */ 254 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer)) 255 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) != 256 LDNS_PACKET_QUERY 257 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) { 258 /* error becomes timeout for the module as if this reply 259 * never arrived. */ 260 verbose(VERB_ALGO, "worker: bad reply handled as timeout"); 261 mesh_report_reply(worker->env.mesh, e, reply_info, 262 NETEVENT_TIMEOUT); 263 worker_mem_report(worker, sq); 264 return 0; 265 } 266 mesh_report_reply(worker->env.mesh, e, reply_info, NETEVENT_NOERROR); 267 worker_mem_report(worker, sq); 268 return 0; 269 } 270 271 /** ratelimit error replies 272 * @param worker: the worker struct with ratelimit counter 273 * @param err: error code that would be wanted. 274 * @return value of err if okay, or -1 if it should be discarded instead. 275 */ 276 static int 277 worker_err_ratelimit(struct worker* worker, int err) 278 { 279 if(worker->err_limit_time == *worker->env.now) { 280 /* see if limit is exceeded for this second */ 281 if(worker->err_limit_count++ > ERROR_RATELIMIT) 282 return -1; 283 } else { 284 /* new second, new limits */ 285 worker->err_limit_time = *worker->env.now; 286 worker->err_limit_count = 1; 287 } 288 return err; 289 } 290 291 /** check request sanity. 292 * @param pkt: the wire packet to examine for sanity. 293 * @param worker: parameters for checking. 294 * @return error code, 0 OK, or -1 discard. 295 */ 296 static int 297 worker_check_request(sldns_buffer* pkt, struct worker* worker) 298 { 299 if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) { 300 verbose(VERB_QUERY, "request too short, discarded"); 301 return -1; 302 } 303 if(sldns_buffer_limit(pkt) > NORMAL_UDP_SIZE && 304 worker->daemon->cfg->harden_large_queries) { 305 verbose(VERB_QUERY, "request too large, discarded"); 306 return -1; 307 } 308 if(LDNS_QR_WIRE(sldns_buffer_begin(pkt))) { 309 verbose(VERB_QUERY, "request has QR bit on, discarded"); 310 return -1; 311 } 312 if(LDNS_TC_WIRE(sldns_buffer_begin(pkt))) { 313 LDNS_TC_CLR(sldns_buffer_begin(pkt)); 314 verbose(VERB_QUERY, "request bad, has TC bit on"); 315 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 316 } 317 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY && 318 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY) { 319 verbose(VERB_QUERY, "request unknown opcode %d", 320 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt))); 321 return worker_err_ratelimit(worker, LDNS_RCODE_NOTIMPL); 322 } 323 if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1) { 324 verbose(VERB_QUERY, "request wrong nr qd=%d", 325 LDNS_QDCOUNT(sldns_buffer_begin(pkt))); 326 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 327 } 328 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 0 && 329 (LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 1 || 330 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY)) { 331 verbose(VERB_QUERY, "request wrong nr an=%d", 332 LDNS_ANCOUNT(sldns_buffer_begin(pkt))); 333 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 334 } 335 if(LDNS_NSCOUNT(sldns_buffer_begin(pkt)) != 0) { 336 verbose(VERB_QUERY, "request wrong nr ns=%d", 337 LDNS_NSCOUNT(sldns_buffer_begin(pkt))); 338 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 339 } 340 if(LDNS_ARCOUNT(sldns_buffer_begin(pkt)) > 1) { 341 verbose(VERB_QUERY, "request wrong nr ar=%d", 342 LDNS_ARCOUNT(sldns_buffer_begin(pkt))); 343 return worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 344 } 345 return 0; 346 } 347 348 void 349 worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), uint8_t* msg, 350 size_t len, int error, void* arg) 351 { 352 struct worker* worker = (struct worker*)arg; 353 enum worker_commands cmd; 354 if(error != NETEVENT_NOERROR) { 355 free(msg); 356 if(error == NETEVENT_CLOSED) 357 comm_base_exit(worker->base); 358 else log_info("control event: %d", error); 359 return; 360 } 361 if(len != sizeof(uint32_t)) { 362 fatal_exit("bad control msg length %d", (int)len); 363 } 364 cmd = sldns_read_uint32(msg); 365 free(msg); 366 switch(cmd) { 367 case worker_cmd_quit: 368 verbose(VERB_ALGO, "got control cmd quit"); 369 comm_base_exit(worker->base); 370 break; 371 case worker_cmd_stats: 372 verbose(VERB_ALGO, "got control cmd stats"); 373 server_stats_reply(worker, 1); 374 break; 375 case worker_cmd_stats_noreset: 376 verbose(VERB_ALGO, "got control cmd stats_noreset"); 377 server_stats_reply(worker, 0); 378 break; 379 case worker_cmd_remote: 380 verbose(VERB_ALGO, "got control cmd remote"); 381 daemon_remote_exec(worker); 382 break; 383 default: 384 log_err("bad command %d", (int)cmd); 385 break; 386 } 387 } 388 389 /** check if a delegation is secure */ 390 static enum sec_status 391 check_delegation_secure(struct reply_info *rep) 392 { 393 /* return smallest security status */ 394 size_t i; 395 enum sec_status sec = sec_status_secure; 396 enum sec_status s; 397 size_t num = rep->an_numrrsets + rep->ns_numrrsets; 398 /* check if answer and authority are OK */ 399 for(i=0; i<num; i++) { 400 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data) 401 ->security; 402 if(s < sec) 403 sec = s; 404 } 405 /* in additional, only unchecked triggers revalidation */ 406 for(i=num; i<rep->rrset_count; i++) { 407 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data) 408 ->security; 409 if(s == sec_status_unchecked) 410 return s; 411 } 412 return sec; 413 } 414 415 /** remove nonsecure from a delegation referral additional section */ 416 static void 417 deleg_remove_nonsecure_additional(struct reply_info* rep) 418 { 419 /* we can simply edit it, since we are working in the scratch region */ 420 size_t i; 421 enum sec_status s; 422 423 for(i = rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) { 424 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data) 425 ->security; 426 if(s != sec_status_secure) { 427 memmove(rep->rrsets+i, rep->rrsets+i+1, 428 sizeof(struct ub_packed_rrset_key*)* 429 (rep->rrset_count - i - 1)); 430 rep->ar_numrrsets--; 431 rep->rrset_count--; 432 i--; 433 } 434 } 435 } 436 437 /** answer nonrecursive query from the cache */ 438 static int 439 answer_norec_from_cache(struct worker* worker, struct query_info* qinfo, 440 uint16_t id, uint16_t flags, struct comm_reply* repinfo, 441 struct edns_data* edns) 442 { 443 /* for a nonrecursive query return either: 444 * o an error (servfail; we try to avoid this) 445 * o a delegation (closest we have; this routine tries that) 446 * o the answer (checked by answer_from_cache) 447 * 448 * So, grab a delegation from the rrset cache. 449 * Then check if it needs validation, if so, this routine fails, 450 * so that iterator can prime and validator can verify rrsets. 451 */ 452 uint16_t udpsize = edns->udp_size; 453 int secure = 0; 454 time_t timenow = *worker->env.now; 455 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd) 456 && worker->env.need_to_validate; 457 struct dns_msg *msg = NULL; 458 struct delegpt *dp; 459 460 dp = dns_cache_find_delegation(&worker->env, qinfo->qname, 461 qinfo->qname_len, qinfo->qtype, qinfo->qclass, 462 worker->scratchpad, &msg, timenow); 463 if(!dp) { /* no delegation, need to reprime */ 464 return 0; 465 } 466 /* In case we have a local alias, copy it into the delegation message. 467 * Shallow copy should be fine, as we'll be done with msg in this 468 * function. */ 469 msg->qinfo.local_alias = qinfo->local_alias; 470 if(must_validate) { 471 switch(check_delegation_secure(msg->rep)) { 472 case sec_status_unchecked: 473 /* some rrsets have not been verified yet, go and 474 * let validator do that */ 475 return 0; 476 case sec_status_bogus: 477 case sec_status_secure_sentinel_fail: 478 /* some rrsets are bogus, reply servfail */ 479 edns->edns_version = EDNS_ADVERTISED_VERSION; 480 edns->udp_size = EDNS_ADVERTISED_SIZE; 481 edns->ext_rcode = 0; 482 edns->bits &= EDNS_DO; 483 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, 484 msg->rep, LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad, 485 worker->env.now_tv)) 486 return 0; 487 /* TODO store the reason for the bogus reply in cache 488 * and implement in here instead of the hardcoded EDE */ 489 if (worker->env.cfg->ede) { 490 EDNS_OPT_LIST_APPEND_EDE(&edns->opt_list_out, 491 worker->scratchpad, LDNS_EDE_DNSSEC_BOGUS, ""); 492 } 493 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 494 &msg->qinfo, id, flags, edns); 495 if(worker->stats.extended) { 496 worker->stats.ans_bogus++; 497 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL]++; 498 } 499 return 1; 500 case sec_status_secure: 501 /* all rrsets are secure */ 502 /* remove non-secure rrsets from the add. section*/ 503 if(worker->env.cfg->val_clean_additional) 504 deleg_remove_nonsecure_additional(msg->rep); 505 secure = 1; 506 break; 507 case sec_status_indeterminate: 508 case sec_status_insecure: 509 default: 510 /* not secure */ 511 secure = 0; 512 break; 513 } 514 } 515 /* return this delegation from the cache */ 516 edns->edns_version = EDNS_ADVERTISED_VERSION; 517 edns->udp_size = EDNS_ADVERTISED_SIZE; 518 edns->ext_rcode = 0; 519 edns->bits &= EDNS_DO; 520 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, msg->rep, 521 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad, 522 worker->env.now_tv)) 523 return 0; 524 msg->rep->flags |= BIT_QR|BIT_RA; 525 if(!reply_info_answer_encode(&msg->qinfo, msg->rep, id, flags, 526 repinfo->c->buffer, 0, 1, worker->scratchpad, 527 udpsize, edns, (int)(edns->bits & EDNS_DO), secure)) { 528 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL, 529 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad, 530 worker->env.now_tv)) 531 edns->opt_list_inplace_cb_out = NULL; 532 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 533 &msg->qinfo, id, flags, edns); 534 } 535 if(worker->stats.extended) { 536 if(secure) worker->stats.ans_secure++; 537 server_stats_insrcode(&worker->stats, repinfo->c->buffer); 538 } 539 return 1; 540 } 541 542 /** Apply, if applicable, a response IP action to a cached answer. 543 * If the answer is rewritten as a result of an action, '*encode_repp' will 544 * point to the reply info containing the modified answer. '*encode_repp' will 545 * be intact otherwise. 546 * It returns 1 on success, 0 otherwise. */ 547 static int 548 apply_respip_action(struct worker* worker, const struct query_info* qinfo, 549 struct respip_client_info* cinfo, struct reply_info* rep, 550 struct comm_reply* repinfo, struct ub_packed_rrset_key** alias_rrset, 551 struct reply_info** encode_repp, struct auth_zones* az) 552 { 553 struct respip_action_info actinfo = {0, 0, 0, 0, NULL, 0, NULL}; 554 actinfo.action = respip_none; 555 556 if(qinfo->qtype != LDNS_RR_TYPE_A && 557 qinfo->qtype != LDNS_RR_TYPE_AAAA && 558 qinfo->qtype != LDNS_RR_TYPE_ANY) 559 return 1; 560 561 if(!respip_rewrite_reply(qinfo, cinfo, rep, encode_repp, &actinfo, 562 alias_rrset, 0, worker->scratchpad, az, NULL)) 563 return 0; 564 565 /* xxx_deny actions mean dropping the reply, unless the original reply 566 * was redirected to response-ip data. */ 567 if((actinfo.action == respip_deny || 568 actinfo.action == respip_inform_deny) && 569 *encode_repp == rep) 570 *encode_repp = NULL; 571 572 /* If address info is returned, it means the action should be an 573 * 'inform' variant and the information should be logged. */ 574 if(actinfo.addrinfo) { 575 respip_inform_print(&actinfo, qinfo->qname, 576 qinfo->qtype, qinfo->qclass, qinfo->local_alias, 577 repinfo); 578 579 if(worker->stats.extended && actinfo.rpz_used) { 580 if(actinfo.rpz_disabled) 581 worker->stats.rpz_action[RPZ_DISABLED_ACTION]++; 582 if(actinfo.rpz_cname_override) 583 worker->stats.rpz_action[RPZ_CNAME_OVERRIDE_ACTION]++; 584 else 585 worker->stats.rpz_action[ 586 respip_action_to_rpz_action(actinfo.action)]++; 587 } 588 } 589 590 return 1; 591 } 592 593 /** answer query from the cache. 594 * Normally, the answer message will be built in repinfo->c->buffer; if the 595 * answer is supposed to be suppressed or the answer is supposed to be an 596 * incomplete CNAME chain, the buffer is explicitly cleared to signal the 597 * caller as such. In the latter case *partial_rep will point to the incomplete 598 * reply, and this function is (possibly) supposed to be called again with that 599 * *partial_rep value to complete the chain. In addition, if the query should 600 * be completely dropped, '*need_drop' will be set to 1. */ 601 static int 602 answer_from_cache(struct worker* worker, struct query_info* qinfo, 603 struct respip_client_info* cinfo, int* need_drop, int* is_expired_answer, 604 int* is_secure_answer, struct ub_packed_rrset_key** alias_rrset, 605 struct reply_info** partial_repp, 606 struct reply_info* rep, uint16_t id, uint16_t flags, 607 struct comm_reply* repinfo, struct edns_data* edns) 608 { 609 time_t timenow = *worker->env.now; 610 uint16_t udpsize = edns->udp_size; 611 struct reply_info* encode_rep = rep; 612 struct reply_info* partial_rep = *partial_repp; 613 int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd) 614 && worker->env.need_to_validate; 615 *partial_repp = NULL; /* avoid accidental further pass */ 616 617 /* Check TTL */ 618 if(rep->ttl < timenow) { 619 /* Check if we need to serve expired now */ 620 if(worker->env.cfg->serve_expired && 621 !worker->env.cfg->serve_expired_client_timeout) { 622 if(worker->env.cfg->serve_expired_ttl && 623 rep->serve_expired_ttl < timenow) 624 return 0; 625 if(!rrset_array_lock(rep->ref, rep->rrset_count, 0)) 626 return 0; 627 *is_expired_answer = 1; 628 } else { 629 /* the rrsets may have been updated in the meantime. 630 * we will refetch the message format from the 631 * authoritative server 632 */ 633 return 0; 634 } 635 } else { 636 if(!rrset_array_lock(rep->ref, rep->rrset_count, timenow)) 637 return 0; 638 } 639 /* locked and ids and ttls are OK. */ 640 641 /* check CNAME chain (if any) */ 642 if(rep->an_numrrsets > 0 && (rep->rrsets[0]->rk.type == 643 htons(LDNS_RR_TYPE_CNAME) || rep->rrsets[0]->rk.type == 644 htons(LDNS_RR_TYPE_DNAME))) { 645 if(!reply_check_cname_chain(qinfo, rep)) { 646 /* cname chain invalid, redo iterator steps */ 647 verbose(VERB_ALGO, "Cache reply: cname chain broken"); 648 goto bail_out; 649 } 650 } 651 /* check security status of the cached answer */ 652 if(must_validate && (rep->security == sec_status_bogus || 653 rep->security == sec_status_secure_sentinel_fail)) { 654 /* BAD cached */ 655 edns->edns_version = EDNS_ADVERTISED_VERSION; 656 edns->udp_size = EDNS_ADVERTISED_SIZE; 657 edns->ext_rcode = 0; 658 edns->bits &= EDNS_DO; 659 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, rep, 660 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad, 661 worker->env.now_tv)) 662 goto bail_out; 663 /* TODO store the reason for the bogus reply in cache 664 * and implement in here instead of the hardcoded EDE */ 665 if (worker->env.cfg->ede) { 666 EDNS_OPT_LIST_APPEND_EDE(&edns->opt_list_out, 667 worker->scratchpad, LDNS_EDE_DNSSEC_BOGUS, ""); 668 } 669 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 670 qinfo, id, flags, edns); 671 rrset_array_unlock_touch(worker->env.rrset_cache, 672 worker->scratchpad, rep->ref, rep->rrset_count); 673 if(worker->stats.extended) { 674 worker->stats.ans_bogus ++; 675 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL] ++; 676 } 677 return 1; 678 } else if(rep->security == sec_status_unchecked && must_validate) { 679 verbose(VERB_ALGO, "Cache reply: unchecked entry needs " 680 "validation"); 681 goto bail_out; /* need to validate cache entry first */ 682 } else if(rep->security == sec_status_secure) { 683 if(reply_all_rrsets_secure(rep)) { 684 *is_secure_answer = 1; 685 } else { 686 if(must_validate) { 687 verbose(VERB_ALGO, "Cache reply: secure entry" 688 " changed status"); 689 goto bail_out; /* rrset changed, re-verify */ 690 } 691 *is_secure_answer = 0; 692 } 693 } else *is_secure_answer = 0; 694 695 edns->edns_version = EDNS_ADVERTISED_VERSION; 696 edns->udp_size = EDNS_ADVERTISED_SIZE; 697 edns->ext_rcode = 0; 698 edns->bits &= EDNS_DO; 699 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, rep, 700 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad, 701 worker->env.now_tv)) 702 goto bail_out; 703 *alias_rrset = NULL; /* avoid confusion if caller set it to non-NULL */ 704 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) && 705 !partial_rep && !apply_respip_action(worker, qinfo, cinfo, rep, 706 repinfo, alias_rrset, 707 &encode_rep, worker->env.auth_zones)) { 708 goto bail_out; 709 } else if(partial_rep && 710 !respip_merge_cname(partial_rep, qinfo, rep, cinfo, 711 must_validate, &encode_rep, worker->scratchpad, 712 worker->env.auth_zones)) { 713 goto bail_out; 714 } 715 if(encode_rep != rep) { 716 /* if rewritten, it can't be considered "secure" */ 717 *is_secure_answer = 0; 718 } 719 if(!encode_rep || *alias_rrset) { 720 if(!encode_rep) 721 *need_drop = 1; 722 else { 723 /* If a partial CNAME chain is found, we first need to 724 * make a copy of the reply in the scratchpad so we 725 * can release the locks and lookup the cache again. */ 726 *partial_repp = reply_info_copy(encode_rep, NULL, 727 worker->scratchpad); 728 if(!*partial_repp) 729 goto bail_out; 730 } 731 } else { 732 /* We don't check the global ede as this is a warning, not 733 * an error */ 734 if (*is_expired_answer == 1 && 735 worker->env.cfg->ede_serve_expired && worker->env.cfg->ede) { 736 EDNS_OPT_LIST_APPEND_EDE(&edns->opt_list_out, 737 worker->scratchpad, LDNS_EDE_STALE_ANSWER, ""); 738 } 739 if(!reply_info_answer_encode(qinfo, encode_rep, id, flags, 740 repinfo->c->buffer, timenow, 1, worker->scratchpad, 741 udpsize, edns, (int)(edns->bits & EDNS_DO), 742 *is_secure_answer)) { 743 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, 744 NULL, NULL, LDNS_RCODE_SERVFAIL, edns, repinfo, 745 worker->scratchpad, worker->env.now_tv)) 746 edns->opt_list_inplace_cb_out = NULL; 747 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 748 qinfo, id, flags, edns); 749 } 750 } 751 /* cannot send the reply right now, because blocking network syscall 752 * is bad while holding locks. */ 753 rrset_array_unlock_touch(worker->env.rrset_cache, worker->scratchpad, 754 rep->ref, rep->rrset_count); 755 /* go and return this buffer to the client */ 756 return 1; 757 758 bail_out: 759 rrset_array_unlock_touch(worker->env.rrset_cache, 760 worker->scratchpad, rep->ref, rep->rrset_count); 761 return 0; 762 } 763 764 /** Reply to client and perform prefetch to keep cache up to date. */ 765 static void 766 reply_and_prefetch(struct worker* worker, struct query_info* qinfo, 767 uint16_t flags, struct comm_reply* repinfo, time_t leeway, int noreply, 768 int rpz_passthru, struct edns_option* opt_list) 769 { 770 (void)opt_list; 771 /* first send answer to client to keep its latency 772 * as small as a cachereply */ 773 if(!noreply) { 774 if(repinfo->c->tcp_req_info) { 775 sldns_buffer_copy( 776 repinfo->c->tcp_req_info->spool_buffer, 777 repinfo->c->buffer); 778 } 779 comm_point_send_reply(repinfo); 780 } 781 server_stats_prefetch(&worker->stats, worker); 782 #ifdef CLIENT_SUBNET 783 /* Check if the subnet module is enabled. In that case pass over the 784 * comm_reply information for ECS generation later. The mesh states are 785 * unique when subnet is enabled. */ 786 if(modstack_find(&worker->env.mesh->mods, "subnetcache") != -1 787 && worker->env.unique_mesh) { 788 mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway + 789 PREFETCH_EXPIRY_ADD, rpz_passthru, repinfo, opt_list); 790 return; 791 } 792 #endif 793 /* create the prefetch in the mesh as a normal lookup without 794 * client addrs waiting, which has the cache blacklisted (to bypass 795 * the cache and go to the network for the data). */ 796 /* this (potentially) runs the mesh for the new query */ 797 mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway + 798 PREFETCH_EXPIRY_ADD, rpz_passthru, NULL, NULL); 799 } 800 801 /** 802 * Fill CH class answer into buffer. Keeps query. 803 * @param pkt: buffer 804 * @param str: string to put into text record (<255). 805 * array of strings, every string becomes a text record. 806 * @param num: number of strings in array. 807 * @param edns: edns reply information. 808 * @param worker: worker with scratch region. 809 * @param repinfo: reply information for a communication point. 810 */ 811 static void 812 chaos_replystr(sldns_buffer* pkt, char** str, int num, struct edns_data* edns, 813 struct worker* worker, struct comm_reply* repinfo) 814 { 815 int i; 816 unsigned int rd = LDNS_RD_WIRE(sldns_buffer_begin(pkt)); 817 unsigned int cd = LDNS_CD_WIRE(sldns_buffer_begin(pkt)); 818 size_t udpsize = edns->udp_size; 819 edns->edns_version = EDNS_ADVERTISED_VERSION; 820 edns->udp_size = EDNS_ADVERTISED_SIZE; 821 edns->bits &= EDNS_DO; 822 if(!inplace_cb_reply_local_call(&worker->env, NULL, NULL, NULL, 823 LDNS_RCODE_NOERROR, edns, repinfo, worker->scratchpad, 824 worker->env.now_tv)) 825 edns->opt_list_inplace_cb_out = NULL; 826 sldns_buffer_clear(pkt); 827 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip id */ 828 sldns_buffer_write_u16(pkt, (uint16_t)(BIT_QR|BIT_RA)); 829 if(rd) LDNS_RD_SET(sldns_buffer_begin(pkt)); 830 if(cd) LDNS_CD_SET(sldns_buffer_begin(pkt)); 831 sldns_buffer_write_u16(pkt, 1); /* qdcount */ 832 sldns_buffer_write_u16(pkt, (uint16_t)num); /* ancount */ 833 sldns_buffer_write_u16(pkt, 0); /* nscount */ 834 sldns_buffer_write_u16(pkt, 0); /* arcount */ 835 (void)query_dname_len(pkt); /* skip qname */ 836 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qtype */ 837 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qclass */ 838 for(i=0; i<num; i++) { 839 size_t len = strlen(str[i]); 840 if(len>255) len=255; /* cap size of TXT record */ 841 if(sldns_buffer_position(pkt)+2+2+2+4+2+1+len+ 842 calc_edns_field_size(edns) > udpsize) { 843 sldns_buffer_write_u16_at(pkt, 6, i); /* ANCOUNT */ 844 LDNS_TC_SET(sldns_buffer_begin(pkt)); 845 break; 846 } 847 sldns_buffer_write_u16(pkt, 0xc00c); /* compr ptr to query */ 848 sldns_buffer_write_u16(pkt, LDNS_RR_TYPE_TXT); 849 sldns_buffer_write_u16(pkt, LDNS_RR_CLASS_CH); 850 sldns_buffer_write_u32(pkt, 0); /* TTL */ 851 sldns_buffer_write_u16(pkt, sizeof(uint8_t) + len); 852 sldns_buffer_write_u8(pkt, len); 853 sldns_buffer_write(pkt, str[i], len); 854 } 855 sldns_buffer_flip(pkt); 856 if(sldns_buffer_capacity(pkt) >= 857 sldns_buffer_limit(pkt)+calc_edns_field_size(edns)) 858 attach_edns_record(pkt, edns); 859 } 860 861 /** Reply with one string */ 862 static void 863 chaos_replyonestr(sldns_buffer* pkt, const char* str, struct edns_data* edns, 864 struct worker* worker, struct comm_reply* repinfo) 865 { 866 chaos_replystr(pkt, (char**)&str, 1, edns, worker, repinfo); 867 } 868 869 /** 870 * Create CH class trustanchor answer. 871 * @param pkt: buffer 872 * @param edns: edns reply information. 873 * @param w: worker with scratch region. 874 * @param repinfo: reply information for a communication point. 875 */ 876 static void 877 chaos_trustanchor(sldns_buffer* pkt, struct edns_data* edns, struct worker* w, 878 struct comm_reply* repinfo) 879 { 880 #define TA_RESPONSE_MAX_TXT 16 /* max number of TXT records */ 881 #define TA_RESPONSE_MAX_TAGS 32 /* max number of tags printed per zone */ 882 char* str_array[TA_RESPONSE_MAX_TXT]; 883 uint16_t tags[TA_RESPONSE_MAX_TAGS]; 884 int num = 0; 885 struct trust_anchor* ta; 886 887 if(!w->env.need_to_validate) { 888 /* no validator module, reply no trustanchors */ 889 chaos_replystr(pkt, NULL, 0, edns, w, repinfo); 890 return; 891 } 892 893 /* fill the string with contents */ 894 lock_basic_lock(&w->env.anchors->lock); 895 RBTREE_FOR(ta, struct trust_anchor*, w->env.anchors->tree) { 896 char* str; 897 size_t i, numtag, str_len = 255; 898 if(num == TA_RESPONSE_MAX_TXT) continue; 899 str = (char*)regional_alloc(w->scratchpad, str_len); 900 if(!str) continue; 901 lock_basic_lock(&ta->lock); 902 numtag = anchor_list_keytags(ta, tags, TA_RESPONSE_MAX_TAGS); 903 if(numtag == 0) { 904 /* empty, insecure point */ 905 lock_basic_unlock(&ta->lock); 906 continue; 907 } 908 str_array[num] = str; 909 num++; 910 911 /* spool name of anchor */ 912 (void)sldns_wire2str_dname_buf(ta->name, ta->namelen, str, str_len); 913 str_len -= strlen(str); str += strlen(str); 914 /* spool tags */ 915 for(i=0; i<numtag; i++) { 916 snprintf(str, str_len, " %u", (unsigned)tags[i]); 917 str_len -= strlen(str); str += strlen(str); 918 } 919 lock_basic_unlock(&ta->lock); 920 } 921 lock_basic_unlock(&w->env.anchors->lock); 922 923 chaos_replystr(pkt, str_array, num, edns, w, repinfo); 924 regional_free_all(w->scratchpad); 925 } 926 927 /** 928 * Answer CH class queries. 929 * @param w: worker 930 * @param qinfo: query info. Pointer into packet buffer. 931 * @param edns: edns info from query. 932 * @param repinfo: reply information for a communication point. 933 * @param pkt: packet buffer. 934 * @return: true if a reply is to be sent. 935 */ 936 static int 937 answer_chaos(struct worker* w, struct query_info* qinfo, 938 struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* pkt) 939 { 940 struct config_file* cfg = w->env.cfg; 941 if(qinfo->qtype != LDNS_RR_TYPE_ANY && qinfo->qtype != LDNS_RR_TYPE_TXT) 942 return 0; 943 if(query_dname_compare(qinfo->qname, 944 (uint8_t*)"\002id\006server") == 0 || 945 query_dname_compare(qinfo->qname, 946 (uint8_t*)"\010hostname\004bind") == 0) 947 { 948 if(cfg->hide_identity) 949 return 0; 950 if(cfg->identity==NULL || cfg->identity[0]==0) { 951 char buf[MAXHOSTNAMELEN+1]; 952 if (gethostname(buf, MAXHOSTNAMELEN) == 0) { 953 buf[MAXHOSTNAMELEN] = 0; 954 chaos_replyonestr(pkt, buf, edns, w, repinfo); 955 } else { 956 log_err("gethostname: %s", strerror(errno)); 957 chaos_replyonestr(pkt, "no hostname", edns, w, repinfo); 958 } 959 } 960 else chaos_replyonestr(pkt, cfg->identity, edns, w, repinfo); 961 return 1; 962 } 963 if(query_dname_compare(qinfo->qname, 964 (uint8_t*)"\007version\006server") == 0 || 965 query_dname_compare(qinfo->qname, 966 (uint8_t*)"\007version\004bind") == 0) 967 { 968 if(cfg->hide_version) 969 return 0; 970 if(cfg->version==NULL || cfg->version[0]==0) 971 chaos_replyonestr(pkt, PACKAGE_STRING, edns, w, repinfo); 972 else chaos_replyonestr(pkt, cfg->version, edns, w, repinfo); 973 return 1; 974 } 975 if(query_dname_compare(qinfo->qname, 976 (uint8_t*)"\013trustanchor\007unbound") == 0) 977 { 978 if(cfg->hide_trustanchor) 979 return 0; 980 chaos_trustanchor(pkt, edns, w, repinfo); 981 return 1; 982 } 983 984 return 0; 985 } 986 987 /** 988 * Answer notify queries. These are notifies for authoritative zones, 989 * the reply is an ack that the notify has been received. We need to check 990 * access permission here. 991 * @param w: worker 992 * @param qinfo: query info. Pointer into packet buffer. 993 * @param edns: edns info from query. 994 * @param repinfo: reply info with source address. 995 * @param pkt: packet buffer. 996 */ 997 static void 998 answer_notify(struct worker* w, struct query_info* qinfo, 999 struct edns_data* edns, sldns_buffer* pkt, struct comm_reply* repinfo) 1000 { 1001 int refused = 0; 1002 int rcode = LDNS_RCODE_NOERROR; 1003 uint32_t serial = 0; 1004 int has_serial; 1005 if(!w->env.auth_zones) return; 1006 has_serial = auth_zone_parse_notify_serial(pkt, &serial); 1007 if(auth_zones_notify(w->env.auth_zones, &w->env, qinfo->qname, 1008 qinfo->qname_len, qinfo->qclass, &repinfo->addr, 1009 repinfo->addrlen, has_serial, serial, &refused)) { 1010 rcode = LDNS_RCODE_NOERROR; 1011 } else { 1012 if(refused) 1013 rcode = LDNS_RCODE_REFUSED; 1014 else rcode = LDNS_RCODE_SERVFAIL; 1015 } 1016 1017 if(verbosity >= VERB_DETAIL) { 1018 char buf[380]; 1019 char zname[255+1]; 1020 char sr[25]; 1021 dname_str(qinfo->qname, zname); 1022 sr[0]=0; 1023 if(has_serial) 1024 snprintf(sr, sizeof(sr), "serial %u ", 1025 (unsigned)serial); 1026 if(rcode == LDNS_RCODE_REFUSED) 1027 snprintf(buf, sizeof(buf), 1028 "refused NOTIFY %sfor %s from", sr, zname); 1029 else if(rcode == LDNS_RCODE_SERVFAIL) 1030 snprintf(buf, sizeof(buf), 1031 "servfail for NOTIFY %sfor %s from", sr, zname); 1032 else snprintf(buf, sizeof(buf), 1033 "received NOTIFY %sfor %s from", sr, zname); 1034 log_addr(VERB_DETAIL, buf, &repinfo->addr, repinfo->addrlen); 1035 } 1036 edns->edns_version = EDNS_ADVERTISED_VERSION; 1037 edns->udp_size = EDNS_ADVERTISED_SIZE; 1038 edns->ext_rcode = 0; 1039 edns->bits &= EDNS_DO; 1040 error_encode(pkt, rcode, qinfo, 1041 *(uint16_t*)(void *)sldns_buffer_begin(pkt), 1042 sldns_buffer_read_u16_at(pkt, 2), edns); 1043 LDNS_OPCODE_SET(sldns_buffer_begin(pkt), LDNS_PACKET_NOTIFY); 1044 } 1045 1046 static int 1047 deny_refuse(struct comm_point* c, enum acl_access acl, 1048 enum acl_access deny, enum acl_access refuse, 1049 struct worker* worker, struct comm_reply* repinfo, 1050 struct acl_addr* acladdr, int ede) 1051 { 1052 if(acl == deny) { 1053 if(verbosity >= VERB_ALGO) { 1054 log_acl_action("dropped", &repinfo->addr, 1055 repinfo->addrlen, acl, acladdr); 1056 log_buf(VERB_ALGO, "dropped", c->buffer); 1057 } 1058 comm_point_drop_reply(repinfo); 1059 if(worker->stats.extended) 1060 worker->stats.unwanted_queries++; 1061 return 0; 1062 } else if(acl == refuse) { 1063 size_t opt_rr_mark; 1064 1065 if(verbosity >= VERB_ALGO) { 1066 log_acl_action("refused", &repinfo->addr, 1067 repinfo->addrlen, acl, acladdr); 1068 log_buf(VERB_ALGO, "refuse", c->buffer); 1069 } 1070 1071 if(worker->stats.extended) 1072 worker->stats.unwanted_queries++; 1073 if(worker_check_request(c->buffer, worker) == -1) { 1074 comm_point_drop_reply(repinfo); 1075 return 0; /* discard this */ 1076 } 1077 /* worker_check_request() above guarantees that the buffer contains at 1078 * least a header and that qdcount == 1 1079 */ 1080 log_assert(sldns_buffer_limit(c->buffer) >= LDNS_HEADER_SIZE 1081 && LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) == 1); 1082 1083 sldns_buffer_skip(c->buffer, LDNS_HEADER_SIZE); /* skip header */ 1084 1085 /* check additional section is present and that we respond with EDEs */ 1086 if(LDNS_ARCOUNT(sldns_buffer_begin(c->buffer)) != 1 1087 || !ede) { 1088 LDNS_QDCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1089 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1090 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1091 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1092 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1093 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1094 LDNS_RCODE_REFUSED); 1095 sldns_buffer_flip(c->buffer); 1096 return 1; 1097 } 1098 1099 if (!query_dname_len(c->buffer)) { 1100 LDNS_QDCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1101 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1102 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1103 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1104 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1105 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1106 LDNS_RCODE_FORMERR); 1107 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1108 sldns_buffer_flip(c->buffer); 1109 return 1; 1110 } 1111 /* space available for query type and class? */ 1112 if (sldns_buffer_remaining(c->buffer) < 2 * sizeof(uint16_t)) { 1113 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1114 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1115 LDNS_RCODE_FORMERR); 1116 LDNS_QDCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1117 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1118 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1119 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1120 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1121 sldns_buffer_flip(c->buffer); 1122 return 1; 1123 } 1124 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1125 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1126 LDNS_RCODE_REFUSED); 1127 1128 sldns_buffer_skip(c->buffer, (ssize_t)sizeof(uint16_t)); /* skip qtype */ 1129 1130 sldns_buffer_skip(c->buffer, (ssize_t)sizeof(uint16_t)); /* skip qclass */ 1131 1132 /* The OPT RR to be returned should come directly after 1133 * the query, so mark this spot. 1134 */ 1135 opt_rr_mark = sldns_buffer_position(c->buffer); 1136 1137 /* Skip through the RR records */ 1138 if(LDNS_ANCOUNT(sldns_buffer_begin(c->buffer)) != 0 || 1139 LDNS_NSCOUNT(sldns_buffer_begin(c->buffer)) != 0) { 1140 if(!skip_pkt_rrs(c->buffer, 1141 ((int)LDNS_ANCOUNT(sldns_buffer_begin(c->buffer)))+ 1142 ((int)LDNS_NSCOUNT(sldns_buffer_begin(c->buffer))))) { 1143 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1144 LDNS_RCODE_FORMERR); 1145 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1146 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1147 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1148 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1149 sldns_buffer_flip(c->buffer); 1150 return 1; 1151 } 1152 } 1153 /* Do we have a valid OPT RR here? If not return REFUSED (could be a valid TSIG or something so no FORMERR) */ 1154 /* domain name must be the root of length 1. */ 1155 if(sldns_buffer_remaining(c->buffer) < 1 || *sldns_buffer_current(c->buffer) != 0) { 1156 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1157 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1158 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1159 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1160 sldns_buffer_flip(c->buffer); 1161 return 1; 1162 } else { 1163 sldns_buffer_skip(c->buffer, 1); /* skip root label */ 1164 } 1165 if(sldns_buffer_remaining(c->buffer) < 2 || 1166 sldns_buffer_read_u16(c->buffer) != LDNS_RR_TYPE_OPT) { 1167 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1168 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1169 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1170 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1171 sldns_buffer_flip(c->buffer); 1172 return 1; 1173 } 1174 /* Write OPT RR directly after the query, 1175 * so without the (possibly skipped) Answer and NS RRs 1176 */ 1177 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1178 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1179 sldns_buffer_clear(c->buffer); /* reset write limit */ 1180 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1181 1182 /* Check if OPT record can be written 1183 * 17 == root label (1) + RR type (2) + UDP Size (2) 1184 * + Fields (4) + rdata len (2) + EDE Option code (2) 1185 * + EDE Option length (2) + EDE info-code (2) 1186 */ 1187 if (sldns_buffer_available(c->buffer, 17) == 0) { 1188 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1189 sldns_buffer_flip(c->buffer); 1190 return 1; 1191 } 1192 1193 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 1); 1194 1195 /* root label */ 1196 sldns_buffer_write_u8(c->buffer, 0); 1197 sldns_buffer_write_u16(c->buffer, LDNS_RR_TYPE_OPT); 1198 sldns_buffer_write_u16(c->buffer, EDNS_ADVERTISED_SIZE); 1199 1200 /* write OPT Record TTL Field */ 1201 sldns_buffer_write_u32(c->buffer, 0); 1202 1203 /* write rdata len: EDE option + length + info-code */ 1204 sldns_buffer_write_u16(c->buffer, 6); 1205 1206 /* write OPTIONS; add EDE option code */ 1207 sldns_buffer_write_u16(c->buffer, LDNS_EDNS_EDE); 1208 1209 /* write single EDE option length (for just 1 info-code) */ 1210 sldns_buffer_write_u16(c->buffer, 2); 1211 1212 /* write single EDE info-code */ 1213 sldns_buffer_write_u16(c->buffer, LDNS_EDE_PROHIBITED); 1214 1215 sldns_buffer_flip(c->buffer); 1216 1217 verbose(VERB_ALGO, "attached EDE code: %d", LDNS_EDE_PROHIBITED); 1218 1219 return 1; 1220 1221 } 1222 1223 return -1; 1224 } 1225 1226 static int 1227 deny_refuse_all(struct comm_point* c, enum acl_access acl, 1228 struct worker* worker, struct comm_reply* repinfo, 1229 struct acl_addr* acladdr, int ede) 1230 { 1231 return deny_refuse(c, acl, acl_deny, acl_refuse, worker, repinfo, 1232 acladdr, ede); 1233 } 1234 1235 static int 1236 deny_refuse_non_local(struct comm_point* c, enum acl_access acl, 1237 struct worker* worker, struct comm_reply* repinfo, 1238 struct acl_addr* acladdr, int ede) 1239 { 1240 return deny_refuse(c, acl, acl_deny_non_local, acl_refuse_non_local, 1241 worker, repinfo, acladdr, ede); 1242 } 1243 1244 int 1245 worker_handle_request(struct comm_point* c, void* arg, int error, 1246 struct comm_reply* repinfo) 1247 { 1248 struct worker* worker = (struct worker*)arg; 1249 int ret; 1250 hashvalue_type h; 1251 struct lruhash_entry* e; 1252 struct query_info qinfo; 1253 struct edns_data edns; 1254 struct edns_option* original_edns_list = NULL; 1255 enum acl_access acl; 1256 struct acl_addr* acladdr; 1257 int rc = 0; 1258 int need_drop = 0; 1259 int is_expired_answer = 0; 1260 int is_secure_answer = 0; 1261 int rpz_passthru = 0; 1262 /* We might have to chase a CNAME chain internally, in which case 1263 * we'll have up to two replies and combine them to build a complete 1264 * answer. These variables control this case. */ 1265 struct ub_packed_rrset_key* alias_rrset = NULL; 1266 struct reply_info* partial_rep = NULL; 1267 struct query_info* lookup_qinfo = &qinfo; 1268 struct query_info qinfo_tmp; /* placeholder for lookup_qinfo */ 1269 struct respip_client_info* cinfo = NULL, cinfo_tmp; 1270 memset(&qinfo, 0, sizeof(qinfo)); 1271 1272 if((error != NETEVENT_NOERROR && error != NETEVENT_DONE)|| !repinfo) { 1273 /* some bad tcp query DNS formats give these error calls */ 1274 verbose(VERB_ALGO, "handle request called with err=%d", error); 1275 return 0; 1276 } 1277 #ifdef USE_DNSCRYPT 1278 repinfo->max_udp_size = worker->daemon->cfg->max_udp_size; 1279 if(!dnsc_handle_curved_request(worker->daemon->dnscenv, repinfo)) { 1280 worker->stats.num_query_dnscrypt_crypted_malformed++; 1281 return 0; 1282 } 1283 if(c->dnscrypt && !repinfo->is_dnscrypted) { 1284 char buf[LDNS_MAX_DOMAINLEN+1]; 1285 /* Check if this is unencrypted and asking for certs */ 1286 if(worker_check_request(c->buffer, worker) != 0) { 1287 verbose(VERB_ALGO, 1288 "dnscrypt: worker check request: bad query."); 1289 log_addr(VERB_CLIENT,"from",&repinfo->addr, 1290 repinfo->addrlen); 1291 comm_point_drop_reply(repinfo); 1292 return 0; 1293 } 1294 if(!query_info_parse(&qinfo, c->buffer)) { 1295 verbose(VERB_ALGO, 1296 "dnscrypt: worker parse request: formerror."); 1297 log_addr(VERB_CLIENT, "from", &repinfo->addr, 1298 repinfo->addrlen); 1299 comm_point_drop_reply(repinfo); 1300 return 0; 1301 } 1302 dname_str(qinfo.qname, buf); 1303 if(!(qinfo.qtype == LDNS_RR_TYPE_TXT && 1304 strcasecmp(buf, 1305 worker->daemon->dnscenv->provider_name) == 0)) { 1306 verbose(VERB_ALGO, 1307 "dnscrypt: not TXT \"%s\". Received: %s \"%s\"", 1308 worker->daemon->dnscenv->provider_name, 1309 sldns_rr_descript(qinfo.qtype)->_name, 1310 buf); 1311 comm_point_drop_reply(repinfo); 1312 worker->stats.num_query_dnscrypt_cleartext++; 1313 return 0; 1314 } 1315 worker->stats.num_query_dnscrypt_cert++; 1316 sldns_buffer_rewind(c->buffer); 1317 } else if(c->dnscrypt && repinfo->is_dnscrypted) { 1318 worker->stats.num_query_dnscrypt_crypted++; 1319 } 1320 #endif 1321 #ifdef USE_DNSTAP 1322 /* 1323 * sending src (client)/dst (local service) addresses over DNSTAP from incoming request handler 1324 */ 1325 if(worker->dtenv.log_client_query_messages) { 1326 log_addr(VERB_ALGO, "request from client", &repinfo->addr, repinfo->addrlen); 1327 log_addr(VERB_ALGO, "to local addr", (void*)repinfo->c->socket->addr->ai_addr, repinfo->c->socket->addr->ai_addrlen); 1328 dt_msg_send_client_query(&worker->dtenv, &repinfo->addr, (void*)repinfo->c->socket->addr->ai_addr, c->type, c->buffer); 1329 } 1330 #endif 1331 acladdr = acl_addr_lookup(worker->daemon->acl, &repinfo->addr, 1332 repinfo->addrlen); 1333 acl = acl_get_control(acladdr); 1334 1335 if((ret=deny_refuse_all(c, acl, worker, repinfo, acladdr, 1336 worker->env.cfg->ede)) != -1) 1337 { 1338 if(ret == 1) 1339 goto send_reply; 1340 return ret; 1341 } 1342 if((ret=worker_check_request(c->buffer, worker)) != 0) { 1343 verbose(VERB_ALGO, "worker check request: bad query."); 1344 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1345 if(ret != -1) { 1346 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1347 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret); 1348 return 1; 1349 } 1350 comm_point_drop_reply(repinfo); 1351 return 0; 1352 } 1353 1354 worker->stats.num_queries++; 1355 1356 /* check if this query should be dropped based on source ip rate limiting */ 1357 if(!infra_ip_ratelimit_inc(worker->env.infra_cache, repinfo, 1358 *worker->env.now, 1359 worker->env.cfg->ip_ratelimit_backoff, c->buffer)) { 1360 /* See if we are passed through with slip factor */ 1361 if(worker->env.cfg->ip_ratelimit_factor != 0 && 1362 ub_random_max(worker->env.rnd, 1363 worker->env.cfg->ip_ratelimit_factor) == 0) { 1364 1365 char addrbuf[128]; 1366 addr_to_str(&repinfo->addr, repinfo->addrlen, 1367 addrbuf, sizeof(addrbuf)); 1368 verbose(VERB_QUERY, "ip_ratelimit allowed through for ip address %s because of slip in ip_ratelimit_factor", 1369 addrbuf); 1370 } else { 1371 worker->stats.num_queries_ip_ratelimited++; 1372 comm_point_drop_reply(repinfo); 1373 return 0; 1374 } 1375 } 1376 1377 /* see if query is in the cache */ 1378 if(!query_info_parse(&qinfo, c->buffer)) { 1379 verbose(VERB_ALGO, "worker parse request: formerror."); 1380 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1381 memset(&qinfo, 0, sizeof(qinfo)); /* zero qinfo.qname */ 1382 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) { 1383 comm_point_drop_reply(repinfo); 1384 return 0; 1385 } 1386 sldns_buffer_rewind(c->buffer); 1387 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1388 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1389 LDNS_RCODE_FORMERR); 1390 goto send_reply; 1391 } 1392 if(worker->env.cfg->log_queries) { 1393 char ip[128]; 1394 addr_to_str(&repinfo->addr, repinfo->addrlen, ip, sizeof(ip)); 1395 log_query_in(ip, qinfo.qname, qinfo.qtype, qinfo.qclass); 1396 } 1397 if(qinfo.qtype == LDNS_RR_TYPE_AXFR || 1398 qinfo.qtype == LDNS_RR_TYPE_IXFR) { 1399 verbose(VERB_ALGO, "worker request: refused zone transfer."); 1400 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1401 sldns_buffer_rewind(c->buffer); 1402 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1403 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1404 LDNS_RCODE_REFUSED); 1405 if(worker->stats.extended) { 1406 worker->stats.qtype[qinfo.qtype]++; 1407 } 1408 goto send_reply; 1409 } 1410 if(qinfo.qtype == LDNS_RR_TYPE_OPT || 1411 qinfo.qtype == LDNS_RR_TYPE_TSIG || 1412 qinfo.qtype == LDNS_RR_TYPE_TKEY || 1413 qinfo.qtype == LDNS_RR_TYPE_MAILA || 1414 qinfo.qtype == LDNS_RR_TYPE_MAILB || 1415 (qinfo.qtype >= 128 && qinfo.qtype <= 248)) { 1416 verbose(VERB_ALGO, "worker request: formerror for meta-type."); 1417 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1418 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) { 1419 comm_point_drop_reply(repinfo); 1420 return 0; 1421 } 1422 sldns_buffer_rewind(c->buffer); 1423 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1424 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1425 LDNS_RCODE_FORMERR); 1426 if(worker->stats.extended) { 1427 worker->stats.qtype[qinfo.qtype]++; 1428 } 1429 goto send_reply; 1430 } 1431 if((ret=parse_edns_from_query_pkt(c->buffer, &edns, worker->env.cfg, c, 1432 worker->scratchpad)) != 0) { 1433 struct edns_data reply_edns; 1434 verbose(VERB_ALGO, "worker parse edns: formerror."); 1435 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1436 memset(&reply_edns, 0, sizeof(reply_edns)); 1437 reply_edns.edns_present = 1; 1438 reply_edns.udp_size = EDNS_ADVERTISED_SIZE; 1439 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret); 1440 error_encode(c->buffer, ret, &qinfo, 1441 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1442 sldns_buffer_read_u16_at(c->buffer, 2), &reply_edns); 1443 regional_free_all(worker->scratchpad); 1444 goto send_reply; 1445 } 1446 if(edns.edns_present) { 1447 if(edns.edns_version != 0) { 1448 edns.ext_rcode = (uint8_t)(EDNS_RCODE_BADVERS>>4); 1449 edns.edns_version = EDNS_ADVERTISED_VERSION; 1450 edns.udp_size = EDNS_ADVERTISED_SIZE; 1451 edns.bits &= EDNS_DO; 1452 edns.opt_list_in = NULL; 1453 edns.opt_list_out = NULL; 1454 edns.opt_list_inplace_cb_out = NULL; 1455 edns.padding_block_size = 0; 1456 verbose(VERB_ALGO, "query with bad edns version."); 1457 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1458 error_encode(c->buffer, EDNS_RCODE_BADVERS&0xf, &qinfo, 1459 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1460 sldns_buffer_read_u16_at(c->buffer, 2), NULL); 1461 if(sldns_buffer_capacity(c->buffer) >= 1462 sldns_buffer_limit(c->buffer)+calc_edns_field_size(&edns)) 1463 attach_edns_record(c->buffer, &edns); 1464 regional_free_all(worker->scratchpad); 1465 goto send_reply; 1466 } 1467 if(edns.udp_size < NORMAL_UDP_SIZE && 1468 worker->daemon->cfg->harden_short_bufsize) { 1469 verbose(VERB_QUERY, "worker request: EDNS bufsize %d ignored", 1470 (int)edns.udp_size); 1471 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1472 edns.udp_size = NORMAL_UDP_SIZE; 1473 } 1474 } 1475 if(edns.udp_size > worker->daemon->cfg->max_udp_size && 1476 c->type == comm_udp) { 1477 verbose(VERB_QUERY, 1478 "worker request: max UDP reply size modified" 1479 " (%d to max-udp-size)", (int)edns.udp_size); 1480 log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen); 1481 edns.udp_size = worker->daemon->cfg->max_udp_size; 1482 } 1483 if(edns.udp_size < LDNS_HEADER_SIZE) { 1484 verbose(VERB_ALGO, "worker request: edns is too small."); 1485 log_addr(VERB_CLIENT, "from", &repinfo->addr, repinfo->addrlen); 1486 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1487 LDNS_TC_SET(sldns_buffer_begin(c->buffer)); 1488 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1489 LDNS_RCODE_SERVFAIL); 1490 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1491 sldns_buffer_write_at(c->buffer, 4, 1492 (uint8_t*)"\0\0\0\0\0\0\0\0", 8); 1493 sldns_buffer_flip(c->buffer); 1494 regional_free_all(worker->scratchpad); 1495 goto send_reply; 1496 } 1497 if(worker->stats.extended) 1498 server_stats_insquery(&worker->stats, c, qinfo.qtype, 1499 qinfo.qclass, &edns, repinfo); 1500 if(c->type != comm_udp) 1501 edns.udp_size = 65535; /* max size for TCP replies */ 1502 if(qinfo.qclass == LDNS_RR_CLASS_CH && answer_chaos(worker, &qinfo, 1503 &edns, repinfo, c->buffer)) { 1504 regional_free_all(worker->scratchpad); 1505 goto send_reply; 1506 } 1507 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) == 1508 LDNS_PACKET_NOTIFY) { 1509 answer_notify(worker, &qinfo, &edns, c->buffer, repinfo); 1510 regional_free_all(worker->scratchpad); 1511 goto send_reply; 1512 } 1513 if(local_zones_answer(worker->daemon->local_zones, &worker->env, &qinfo, 1514 &edns, c->buffer, worker->scratchpad, repinfo, acladdr->taglist, 1515 acladdr->taglen, acladdr->tag_actions, 1516 acladdr->tag_actions_size, acladdr->tag_datas, 1517 acladdr->tag_datas_size, worker->daemon->cfg->tagname, 1518 worker->daemon->cfg->num_tags, acladdr->view)) { 1519 regional_free_all(worker->scratchpad); 1520 if(sldns_buffer_limit(c->buffer) == 0) { 1521 comm_point_drop_reply(repinfo); 1522 return 0; 1523 } 1524 goto send_reply; 1525 } 1526 if(worker->env.auth_zones && 1527 rpz_callback_from_worker_request(worker->env.auth_zones, 1528 &worker->env, &qinfo, &edns, c->buffer, worker->scratchpad, 1529 repinfo, acladdr->taglist, acladdr->taglen, &worker->stats, 1530 &rpz_passthru)) { 1531 regional_free_all(worker->scratchpad); 1532 if(sldns_buffer_limit(c->buffer) == 0) { 1533 comm_point_drop_reply(repinfo); 1534 return 0; 1535 } 1536 goto send_reply; 1537 } 1538 if(worker->env.auth_zones && 1539 auth_zones_answer(worker->env.auth_zones, &worker->env, 1540 &qinfo, &edns, repinfo, c->buffer, worker->scratchpad)) { 1541 regional_free_all(worker->scratchpad); 1542 if(sldns_buffer_limit(c->buffer) == 0) { 1543 comm_point_drop_reply(repinfo); 1544 return 0; 1545 } 1546 /* set RA for everyone that can have recursion (based on 1547 * access control list) */ 1548 if(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer)) && 1549 acl != acl_deny_non_local && acl != acl_refuse_non_local) 1550 LDNS_RA_SET(sldns_buffer_begin(c->buffer)); 1551 goto send_reply; 1552 } 1553 1554 /* We've looked in our local zones. If the answer isn't there, we 1555 * might need to bail out based on ACLs now. */ 1556 if((ret=deny_refuse_non_local(c, acl, worker, repinfo, acladdr, 1557 worker->env.cfg->ede)) != -1) 1558 { 1559 regional_free_all(worker->scratchpad); 1560 if(ret == 1) 1561 goto send_reply; 1562 return ret; 1563 } 1564 1565 /* If this request does not have the recursion bit set, verify 1566 * ACLs allow the recursion bit to be treated as set. */ 1567 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) && 1568 acl == acl_allow_setrd ) { 1569 LDNS_RD_SET(sldns_buffer_begin(c->buffer)); 1570 } 1571 1572 /* If this request does not have the recursion bit set, verify 1573 * ACLs allow the snooping. */ 1574 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) && 1575 acl != acl_allow_snoop ) { 1576 if (worker->env.cfg->ede) { 1577 EDNS_OPT_LIST_APPEND_EDE(&edns.opt_list_out, 1578 worker->scratchpad, LDNS_EDE_NOT_AUTHORITATIVE, ""); 1579 } 1580 error_encode(c->buffer, LDNS_RCODE_REFUSED, &qinfo, 1581 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1582 sldns_buffer_read_u16_at(c->buffer, 2), &edns); 1583 regional_free_all(worker->scratchpad); 1584 log_addr(VERB_ALGO, "refused nonrec (cache snoop) query from", 1585 &repinfo->addr, repinfo->addrlen); 1586 1587 goto send_reply; 1588 } 1589 1590 /* If we've found a local alias, replace the qname with the alias 1591 * target before resolving it. */ 1592 if(qinfo.local_alias) { 1593 struct ub_packed_rrset_key* rrset = qinfo.local_alias->rrset; 1594 struct packed_rrset_data* d = rrset->entry.data; 1595 1596 /* Sanity check: our current implementation only supports 1597 * a single CNAME RRset as a local alias. */ 1598 if(qinfo.local_alias->next || 1599 rrset->rk.type != htons(LDNS_RR_TYPE_CNAME) || 1600 d->count != 1) { 1601 log_err("assumption failure: unexpected local alias"); 1602 regional_free_all(worker->scratchpad); 1603 return 0; /* drop it */ 1604 } 1605 qinfo.qname = d->rr_data[0] + 2; 1606 qinfo.qname_len = d->rr_len[0] - 2; 1607 } 1608 1609 /* If we may apply IP-based actions to the answer, build the client 1610 * information. As this can be expensive, skip it if there is 1611 * absolutely no possibility of it. */ 1612 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) && 1613 (qinfo.qtype == LDNS_RR_TYPE_A || 1614 qinfo.qtype == LDNS_RR_TYPE_AAAA || 1615 qinfo.qtype == LDNS_RR_TYPE_ANY)) { 1616 cinfo_tmp.taglist = acladdr->taglist; 1617 cinfo_tmp.taglen = acladdr->taglen; 1618 cinfo_tmp.tag_actions = acladdr->tag_actions; 1619 cinfo_tmp.tag_actions_size = acladdr->tag_actions_size; 1620 cinfo_tmp.tag_datas = acladdr->tag_datas; 1621 cinfo_tmp.tag_datas_size = acladdr->tag_datas_size; 1622 cinfo_tmp.view = acladdr->view; 1623 cinfo_tmp.respip_set = worker->daemon->respip_set; 1624 cinfo = &cinfo_tmp; 1625 } 1626 1627 /* Keep the original edns list around. The pointer could change if there is 1628 * a cached answer (through the inplace callback function there). 1629 * No need to actually copy the contents as they shouldn't change. 1630 * Used while prefetching and subnet is enabled. */ 1631 original_edns_list = edns.opt_list_in; 1632 lookup_cache: 1633 /* Lookup the cache. In case we chase an intermediate CNAME chain 1634 * this is a two-pass operation, and lookup_qinfo is different for 1635 * each pass. We should still pass the original qinfo to 1636 * answer_from_cache(), however, since it's used to build the reply. */ 1637 if(!edns_bypass_cache_stage(edns.opt_list_in, &worker->env)) { 1638 is_expired_answer = 0; 1639 is_secure_answer = 0; 1640 h = query_info_hash(lookup_qinfo, sldns_buffer_read_u16_at(c->buffer, 2)); 1641 if((e=slabhash_lookup(worker->env.msg_cache, h, lookup_qinfo, 0))) { 1642 /* answer from cache - we have acquired a readlock on it */ 1643 if(answer_from_cache(worker, &qinfo, 1644 cinfo, &need_drop, &is_expired_answer, &is_secure_answer, 1645 &alias_rrset, &partial_rep, (struct reply_info*)e->data, 1646 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1647 sldns_buffer_read_u16_at(c->buffer, 2), repinfo, 1648 &edns)) { 1649 /* prefetch it if the prefetch TTL expired. 1650 * Note that if there is more than one pass 1651 * its qname must be that used for cache 1652 * lookup. */ 1653 if((worker->env.cfg->prefetch && *worker->env.now >= 1654 ((struct reply_info*)e->data)->prefetch_ttl) || 1655 (worker->env.cfg->serve_expired && 1656 *worker->env.now >= ((struct reply_info*)e->data)->ttl)) { 1657 1658 time_t leeway = ((struct reply_info*)e-> 1659 data)->ttl - *worker->env.now; 1660 if(((struct reply_info*)e->data)->ttl 1661 < *worker->env.now) 1662 leeway = 0; 1663 lock_rw_unlock(&e->lock); 1664 1665 reply_and_prefetch(worker, lookup_qinfo, 1666 sldns_buffer_read_u16_at(c->buffer, 2), 1667 repinfo, leeway, 1668 (partial_rep || need_drop), 1669 rpz_passthru, 1670 original_edns_list); 1671 if(!partial_rep) { 1672 rc = 0; 1673 regional_free_all(worker->scratchpad); 1674 goto send_reply_rc; 1675 } 1676 } else if(!partial_rep) { 1677 lock_rw_unlock(&e->lock); 1678 regional_free_all(worker->scratchpad); 1679 goto send_reply; 1680 } else { 1681 /* Note that we've already released the 1682 * lock if we're here after prefetch. */ 1683 lock_rw_unlock(&e->lock); 1684 } 1685 /* We've found a partial reply ending with an 1686 * alias. Replace the lookup qinfo for the 1687 * alias target and lookup the cache again to 1688 * (possibly) complete the reply. As we're 1689 * passing the "base" reply, there will be no 1690 * more alias chasing. */ 1691 memset(&qinfo_tmp, 0, sizeof(qinfo_tmp)); 1692 get_cname_target(alias_rrset, &qinfo_tmp.qname, 1693 &qinfo_tmp.qname_len); 1694 if(!qinfo_tmp.qname) { 1695 log_err("unexpected: invalid answer alias"); 1696 regional_free_all(worker->scratchpad); 1697 return 0; /* drop query */ 1698 } 1699 qinfo_tmp.qtype = qinfo.qtype; 1700 qinfo_tmp.qclass = qinfo.qclass; 1701 lookup_qinfo = &qinfo_tmp; 1702 goto lookup_cache; 1703 } 1704 verbose(VERB_ALGO, "answer from the cache failed"); 1705 lock_rw_unlock(&e->lock); 1706 } 1707 1708 if(!LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) { 1709 if(answer_norec_from_cache(worker, &qinfo, 1710 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1711 sldns_buffer_read_u16_at(c->buffer, 2), repinfo, 1712 &edns)) { 1713 regional_free_all(worker->scratchpad); 1714 goto send_reply; 1715 } 1716 verbose(VERB_ALGO, "answer norec from cache -- " 1717 "need to validate or not primed"); 1718 } 1719 } 1720 sldns_buffer_rewind(c->buffer); 1721 server_stats_querymiss(&worker->stats, worker); 1722 1723 if(verbosity >= VERB_CLIENT) { 1724 if(c->type == comm_udp) 1725 log_addr(VERB_CLIENT, "udp request from", 1726 &repinfo->addr, repinfo->addrlen); 1727 else log_addr(VERB_CLIENT, "tcp request from", 1728 &repinfo->addr, repinfo->addrlen); 1729 } 1730 1731 /* grab a work request structure for this new request */ 1732 mesh_new_client(worker->env.mesh, &qinfo, cinfo, 1733 sldns_buffer_read_u16_at(c->buffer, 2), 1734 &edns, repinfo, *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1735 rpz_passthru); 1736 regional_free_all(worker->scratchpad); 1737 worker_mem_report(worker, NULL); 1738 return 0; 1739 1740 send_reply: 1741 rc = 1; 1742 send_reply_rc: 1743 if(need_drop) { 1744 comm_point_drop_reply(repinfo); 1745 return 0; 1746 } 1747 if(is_expired_answer) { 1748 worker->stats.ans_expired++; 1749 } 1750 server_stats_insrcode(&worker->stats, c->buffer); 1751 if(worker->stats.extended) { 1752 if(is_secure_answer) worker->stats.ans_secure++; 1753 } 1754 #ifdef USE_DNSTAP 1755 /* 1756 * sending src (client)/dst (local service) addresses over DNSTAP from send_reply code label (when we serviced local zone for ex.) 1757 */ 1758 if(worker->dtenv.log_client_response_messages) { 1759 log_addr(VERB_ALGO, "from local addr", (void*)repinfo->c->socket->addr->ai_addr, repinfo->c->socket->addr->ai_addrlen); 1760 log_addr(VERB_ALGO, "response to client", &repinfo->addr, repinfo->addrlen); 1761 dt_msg_send_client_response(&worker->dtenv, &repinfo->addr, (void*)repinfo->c->socket->addr->ai_addr, c->type, c->buffer); 1762 } 1763 #endif 1764 if(worker->env.cfg->log_replies) 1765 { 1766 struct timeval tv; 1767 memset(&tv, 0, sizeof(tv)); 1768 if(qinfo.local_alias && qinfo.local_alias->rrset && 1769 qinfo.local_alias->rrset->rk.dname) { 1770 /* log original qname, before the local alias was 1771 * used to resolve that CNAME to something else */ 1772 qinfo.qname = qinfo.local_alias->rrset->rk.dname; 1773 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen, 1774 tv, 1, c->buffer); 1775 } else { 1776 log_reply_info(NO_VERBOSE, &qinfo, &repinfo->addr, repinfo->addrlen, 1777 tv, 1, c->buffer); 1778 } 1779 } 1780 #ifdef USE_DNSCRYPT 1781 if(!dnsc_handle_uncurved_request(repinfo)) { 1782 return 0; 1783 } 1784 #endif 1785 return rc; 1786 } 1787 1788 void 1789 worker_sighandler(int sig, void* arg) 1790 { 1791 /* note that log, print, syscalls here give race conditions. 1792 * And cause hangups if the log-lock is held by the application. */ 1793 struct worker* worker = (struct worker*)arg; 1794 switch(sig) { 1795 #ifdef SIGHUP 1796 case SIGHUP: 1797 comm_base_exit(worker->base); 1798 break; 1799 #endif 1800 #ifdef SIGBREAK 1801 case SIGBREAK: 1802 #endif 1803 case SIGINT: 1804 worker->need_to_exit = 1; 1805 comm_base_exit(worker->base); 1806 break; 1807 #ifdef SIGQUIT 1808 case SIGQUIT: 1809 worker->need_to_exit = 1; 1810 comm_base_exit(worker->base); 1811 break; 1812 #endif 1813 case SIGTERM: 1814 worker->need_to_exit = 1; 1815 comm_base_exit(worker->base); 1816 break; 1817 default: 1818 /* unknown signal, ignored */ 1819 break; 1820 } 1821 } 1822 1823 /** restart statistics timer for worker, if enabled */ 1824 static void 1825 worker_restart_timer(struct worker* worker) 1826 { 1827 if(worker->env.cfg->stat_interval > 0) { 1828 struct timeval tv; 1829 #ifndef S_SPLINT_S 1830 tv.tv_sec = worker->env.cfg->stat_interval; 1831 tv.tv_usec = 0; 1832 #endif 1833 comm_timer_set(worker->stat_timer, &tv); 1834 } 1835 } 1836 1837 void worker_stat_timer_cb(void* arg) 1838 { 1839 struct worker* worker = (struct worker*)arg; 1840 server_stats_log(&worker->stats, worker, worker->thread_num); 1841 mesh_stats(worker->env.mesh, "mesh has"); 1842 worker_mem_report(worker, NULL); 1843 /* SHM is enabled, process data to SHM */ 1844 if (worker->daemon->cfg->shm_enable) { 1845 shm_main_run(worker); 1846 } 1847 if(!worker->daemon->cfg->stat_cumulative) { 1848 worker_stats_clear(worker); 1849 } 1850 /* start next timer */ 1851 worker_restart_timer(worker); 1852 } 1853 1854 void worker_probe_timer_cb(void* arg) 1855 { 1856 struct worker* worker = (struct worker*)arg; 1857 struct timeval tv; 1858 #ifndef S_SPLINT_S 1859 tv.tv_sec = (time_t)autr_probe_timer(&worker->env); 1860 tv.tv_usec = 0; 1861 #endif 1862 if(tv.tv_sec != 0) 1863 comm_timer_set(worker->env.probe_timer, &tv); 1864 } 1865 1866 struct worker* 1867 worker_create(struct daemon* daemon, int id, int* ports, int n) 1868 { 1869 unsigned int seed; 1870 struct worker* worker = (struct worker*)calloc(1, 1871 sizeof(struct worker)); 1872 if(!worker) 1873 return NULL; 1874 worker->numports = n; 1875 worker->ports = (int*)memdup(ports, sizeof(int)*n); 1876 if(!worker->ports) { 1877 free(worker); 1878 return NULL; 1879 } 1880 worker->daemon = daemon; 1881 worker->thread_num = id; 1882 if(!(worker->cmd = tube_create())) { 1883 free(worker->ports); 1884 free(worker); 1885 return NULL; 1886 } 1887 /* create random state here to avoid locking trouble in RAND_bytes */ 1888 if(!(worker->rndstate = ub_initstate(daemon->rand))) { 1889 log_err("could not init random numbers."); 1890 tube_delete(worker->cmd); 1891 free(worker->ports); 1892 free(worker); 1893 return NULL; 1894 } 1895 explicit_bzero(&seed, sizeof(seed)); 1896 return worker; 1897 } 1898 1899 int 1900 worker_init(struct worker* worker, struct config_file *cfg, 1901 struct listen_port* ports, int do_sigs) 1902 { 1903 #ifdef USE_DNSTAP 1904 struct dt_env* dtenv = &worker->dtenv; 1905 #else 1906 void* dtenv = NULL; 1907 #endif 1908 worker->need_to_exit = 0; 1909 worker->base = comm_base_create(do_sigs); 1910 if(!worker->base) { 1911 log_err("could not create event handling base"); 1912 worker_delete(worker); 1913 return 0; 1914 } 1915 comm_base_set_slow_accept_handlers(worker->base, &worker_stop_accept, 1916 &worker_start_accept, worker); 1917 if(do_sigs) { 1918 #ifdef SIGHUP 1919 ub_thread_sig_unblock(SIGHUP); 1920 #endif 1921 #ifdef SIGBREAK 1922 ub_thread_sig_unblock(SIGBREAK); 1923 #endif 1924 ub_thread_sig_unblock(SIGINT); 1925 #ifdef SIGQUIT 1926 ub_thread_sig_unblock(SIGQUIT); 1927 #endif 1928 ub_thread_sig_unblock(SIGTERM); 1929 #ifndef LIBEVENT_SIGNAL_PROBLEM 1930 worker->comsig = comm_signal_create(worker->base, 1931 worker_sighandler, worker); 1932 if(!worker->comsig 1933 #ifdef SIGHUP 1934 || !comm_signal_bind(worker->comsig, SIGHUP) 1935 #endif 1936 #ifdef SIGQUIT 1937 || !comm_signal_bind(worker->comsig, SIGQUIT) 1938 #endif 1939 || !comm_signal_bind(worker->comsig, SIGTERM) 1940 #ifdef SIGBREAK 1941 || !comm_signal_bind(worker->comsig, SIGBREAK) 1942 #endif 1943 || !comm_signal_bind(worker->comsig, SIGINT)) { 1944 log_err("could not create signal handlers"); 1945 worker_delete(worker); 1946 return 0; 1947 } 1948 #endif /* LIBEVENT_SIGNAL_PROBLEM */ 1949 if(!daemon_remote_open_accept(worker->daemon->rc, 1950 worker->daemon->rc_ports, worker)) { 1951 worker_delete(worker); 1952 return 0; 1953 } 1954 #ifdef UB_ON_WINDOWS 1955 wsvc_setup_worker(worker); 1956 #endif /* UB_ON_WINDOWS */ 1957 } else { /* !do_sigs */ 1958 worker->comsig = NULL; 1959 } 1960 #ifdef USE_DNSTAP 1961 if(cfg->dnstap) { 1962 log_assert(worker->daemon->dtenv != NULL); 1963 memcpy(&worker->dtenv, worker->daemon->dtenv, sizeof(struct dt_env)); 1964 if(!dt_init(&worker->dtenv, worker->base)) 1965 fatal_exit("dt_init failed"); 1966 } 1967 #endif 1968 worker->front = listen_create(worker->base, ports, 1969 cfg->msg_buffer_size, (int)cfg->incoming_num_tcp, 1970 cfg->do_tcp_keepalive 1971 ? cfg->tcp_keepalive_timeout 1972 : cfg->tcp_idle_timeout, 1973 cfg->harden_large_queries, cfg->http_max_streams, 1974 cfg->http_endpoint, cfg->http_notls_downstream, 1975 worker->daemon->tcl, worker->daemon->listen_sslctx, 1976 dtenv, worker_handle_request, worker); 1977 if(!worker->front) { 1978 log_err("could not create listening sockets"); 1979 worker_delete(worker); 1980 return 0; 1981 } 1982 worker->back = outside_network_create(worker->base, 1983 cfg->msg_buffer_size, (size_t)cfg->outgoing_num_ports, 1984 cfg->out_ifs, cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6, 1985 cfg->do_tcp?cfg->outgoing_num_tcp:0, cfg->ip_dscp, 1986 worker->daemon->env->infra_cache, worker->rndstate, 1987 cfg->use_caps_bits_for_id, worker->ports, worker->numports, 1988 cfg->unwanted_threshold, cfg->outgoing_tcp_mss, 1989 &worker_alloc_cleanup, worker, 1990 cfg->do_udp || cfg->udp_upstream_without_downstream, 1991 worker->daemon->connect_sslctx, cfg->delay_close, 1992 cfg->tls_use_sni, dtenv, cfg->udp_connect, 1993 cfg->max_reuse_tcp_queries, cfg->tcp_reuse_timeout, 1994 cfg->tcp_auth_query_timeout); 1995 if(!worker->back) { 1996 log_err("could not create outgoing sockets"); 1997 worker_delete(worker); 1998 return 0; 1999 } 2000 iterator_set_ip46_support(&worker->daemon->mods, worker->daemon->env, 2001 worker->back); 2002 /* start listening to commands */ 2003 if(!tube_setup_bg_listen(worker->cmd, worker->base, 2004 &worker_handle_control_cmd, worker)) { 2005 log_err("could not create control compt."); 2006 worker_delete(worker); 2007 return 0; 2008 } 2009 worker->stat_timer = comm_timer_create(worker->base, 2010 worker_stat_timer_cb, worker); 2011 if(!worker->stat_timer) { 2012 log_err("could not create statistics timer"); 2013 } 2014 2015 /* we use the msg_buffer_size as a good estimate for what the 2016 * user wants for memory usage sizes */ 2017 worker->scratchpad = regional_create_custom(cfg->msg_buffer_size); 2018 if(!worker->scratchpad) { 2019 log_err("malloc failure"); 2020 worker_delete(worker); 2021 return 0; 2022 } 2023 2024 server_stats_init(&worker->stats, cfg); 2025 alloc_init(&worker->alloc, &worker->daemon->superalloc, 2026 worker->thread_num); 2027 alloc_set_id_cleanup(&worker->alloc, &worker_alloc_cleanup, worker); 2028 worker->env = *worker->daemon->env; 2029 comm_base_timept(worker->base, &worker->env.now, &worker->env.now_tv); 2030 worker->env.worker = worker; 2031 worker->env.worker_base = worker->base; 2032 worker->env.send_query = &worker_send_query; 2033 worker->env.alloc = &worker->alloc; 2034 worker->env.outnet = worker->back; 2035 worker->env.rnd = worker->rndstate; 2036 /* If case prefetch is triggered, the corresponding mesh will clear 2037 * the scratchpad for the module env in the middle of request handling. 2038 * It would be prone to a use-after-free kind of bug, so we avoid 2039 * sharing it with worker's own scratchpad at the cost of having 2040 * one more pad per worker. */ 2041 worker->env.scratch = regional_create_custom(cfg->msg_buffer_size); 2042 if(!worker->env.scratch) { 2043 log_err("malloc failure"); 2044 worker_delete(worker); 2045 return 0; 2046 } 2047 worker->env.mesh = mesh_create(&worker->daemon->mods, &worker->env); 2048 if(!worker->env.mesh) { 2049 log_err("malloc failure"); 2050 worker_delete(worker); 2051 return 0; 2052 } 2053 /* Pass on daemon variables that we would need in the mesh area */ 2054 worker->env.mesh->use_response_ip = worker->daemon->use_response_ip; 2055 worker->env.mesh->use_rpz = worker->daemon->use_rpz; 2056 2057 worker->env.detach_subs = &mesh_detach_subs; 2058 worker->env.attach_sub = &mesh_attach_sub; 2059 worker->env.add_sub = &mesh_add_sub; 2060 worker->env.kill_sub = &mesh_state_delete; 2061 worker->env.detect_cycle = &mesh_detect_cycle; 2062 worker->env.scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size); 2063 if(!worker->env.scratch_buffer) { 2064 log_err("malloc failure"); 2065 worker_delete(worker); 2066 return 0; 2067 } 2068 if(!(worker->env.fwds = forwards_create()) || 2069 !forwards_apply_cfg(worker->env.fwds, cfg)) { 2070 log_err("Could not set forward zones"); 2071 worker_delete(worker); 2072 return 0; 2073 } 2074 if(!(worker->env.hints = hints_create()) || 2075 !hints_apply_cfg(worker->env.hints, cfg)) { 2076 log_err("Could not set root or stub hints"); 2077 worker_delete(worker); 2078 return 0; 2079 } 2080 /* one probe timer per process -- if we have 5011 anchors */ 2081 if(autr_get_num_anchors(worker->env.anchors) > 0 2082 #ifndef THREADS_DISABLED 2083 && worker->thread_num == 0 2084 #endif 2085 ) { 2086 struct timeval tv; 2087 tv.tv_sec = 0; 2088 tv.tv_usec = 0; 2089 worker->env.probe_timer = comm_timer_create(worker->base, 2090 worker_probe_timer_cb, worker); 2091 if(!worker->env.probe_timer) { 2092 log_err("could not create 5011-probe timer"); 2093 } else { 2094 /* let timer fire, then it can reset itself */ 2095 comm_timer_set(worker->env.probe_timer, &tv); 2096 } 2097 } 2098 /* zone transfer tasks, setup once per process, if any */ 2099 if(worker->env.auth_zones 2100 #ifndef THREADS_DISABLED 2101 && worker->thread_num == 0 2102 #endif 2103 ) { 2104 auth_xfer_pickup_initial(worker->env.auth_zones, &worker->env); 2105 auth_zones_pickup_zonemd_verify(worker->env.auth_zones, 2106 &worker->env); 2107 } 2108 #ifdef USE_DNSTAP 2109 if(worker->daemon->cfg->dnstap 2110 #ifndef THREADS_DISABLED 2111 && worker->thread_num == 0 2112 #endif 2113 ) { 2114 if(!dt_io_thread_start(dtenv->dtio, comm_base_internal( 2115 worker->base), worker->daemon->num)) { 2116 log_err("could not start dnstap io thread"); 2117 worker_delete(worker); 2118 return 0; 2119 } 2120 } 2121 #endif /* USE_DNSTAP */ 2122 worker_mem_report(worker, NULL); 2123 /* if statistics enabled start timer */ 2124 if(worker->env.cfg->stat_interval > 0) { 2125 verbose(VERB_ALGO, "set statistics interval %d secs", 2126 worker->env.cfg->stat_interval); 2127 worker_restart_timer(worker); 2128 } 2129 return 1; 2130 } 2131 2132 void 2133 worker_work(struct worker* worker) 2134 { 2135 comm_base_dispatch(worker->base); 2136 } 2137 2138 void 2139 worker_delete(struct worker* worker) 2140 { 2141 if(!worker) 2142 return; 2143 if(worker->env.mesh && verbosity >= VERB_OPS) { 2144 server_stats_log(&worker->stats, worker, worker->thread_num); 2145 mesh_stats(worker->env.mesh, "mesh has"); 2146 worker_mem_report(worker, NULL); 2147 } 2148 outside_network_quit_prepare(worker->back); 2149 mesh_delete(worker->env.mesh); 2150 sldns_buffer_free(worker->env.scratch_buffer); 2151 forwards_delete(worker->env.fwds); 2152 hints_delete(worker->env.hints); 2153 listen_delete(worker->front); 2154 outside_network_delete(worker->back); 2155 comm_signal_delete(worker->comsig); 2156 tube_delete(worker->cmd); 2157 comm_timer_delete(worker->stat_timer); 2158 comm_timer_delete(worker->env.probe_timer); 2159 free(worker->ports); 2160 if(worker->thread_num == 0) { 2161 #ifdef UB_ON_WINDOWS 2162 wsvc_desetup_worker(worker); 2163 #endif /* UB_ON_WINDOWS */ 2164 } 2165 #ifdef USE_DNSTAP 2166 if(worker->daemon->cfg->dnstap 2167 #ifndef THREADS_DISABLED 2168 && worker->thread_num == 0 2169 #endif 2170 ) { 2171 dt_io_thread_stop(worker->dtenv.dtio); 2172 } 2173 dt_deinit(&worker->dtenv); 2174 #endif /* USE_DNSTAP */ 2175 comm_base_delete(worker->base); 2176 ub_randfree(worker->rndstate); 2177 alloc_clear(&worker->alloc); 2178 regional_destroy(worker->env.scratch); 2179 regional_destroy(worker->scratchpad); 2180 free(worker); 2181 } 2182 2183 struct outbound_entry* 2184 worker_send_query(struct query_info* qinfo, uint16_t flags, int dnssec, 2185 int want_dnssec, int nocaps, int check_ratelimit, 2186 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone, 2187 size_t zonelen, int tcp_upstream, int ssl_upstream, char* tls_auth_name, 2188 struct module_qstate* q, int* was_ratelimited) 2189 { 2190 struct worker* worker = q->env->worker; 2191 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 2192 q->region, sizeof(*e)); 2193 if(!e) 2194 return NULL; 2195 e->qstate = q; 2196 e->qsent = outnet_serviced_query(worker->back, qinfo, flags, dnssec, 2197 want_dnssec, nocaps, check_ratelimit, tcp_upstream, 2198 ssl_upstream, tls_auth_name, addr, addrlen, zone, zonelen, q, 2199 worker_handle_service_reply, e, worker->back->udp_buff, q->env, 2200 was_ratelimited); 2201 if(!e->qsent) { 2202 return NULL; 2203 } 2204 return e; 2205 } 2206 2207 void 2208 worker_alloc_cleanup(void* arg) 2209 { 2210 struct worker* worker = (struct worker*)arg; 2211 slabhash_clear(&worker->env.rrset_cache->table); 2212 slabhash_clear(worker->env.msg_cache); 2213 } 2214 2215 void worker_stats_clear(struct worker* worker) 2216 { 2217 server_stats_init(&worker->stats, worker->env.cfg); 2218 mesh_stats_clear(worker->env.mesh); 2219 worker->back->unwanted_replies = 0; 2220 worker->back->num_tcp_outgoing = 0; 2221 } 2222 2223 void worker_start_accept(void* arg) 2224 { 2225 struct worker* worker = (struct worker*)arg; 2226 listen_start_accept(worker->front); 2227 if(worker->thread_num == 0) 2228 daemon_remote_start_accept(worker->daemon->rc); 2229 } 2230 2231 void worker_stop_accept(void* arg) 2232 { 2233 struct worker* worker = (struct worker*)arg; 2234 listen_stop_accept(worker->front); 2235 if(worker->thread_num == 0) 2236 daemon_remote_stop_accept(worker->daemon->rc); 2237 } 2238 2239 /* --- fake callbacks for fptr_wlist to work --- */ 2240 struct outbound_entry* libworker_send_query( 2241 struct query_info* ATTR_UNUSED(qinfo), 2242 uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec), 2243 int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps), 2244 int ATTR_UNUSED(check_ratelimit), 2245 struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen), 2246 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream), 2247 int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name), 2248 struct module_qstate* ATTR_UNUSED(q), int* ATTR_UNUSED(was_ratelimited)) 2249 { 2250 log_assert(0); 2251 return 0; 2252 } 2253 2254 int libworker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 2255 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 2256 struct comm_reply* ATTR_UNUSED(reply_info)) 2257 { 2258 log_assert(0); 2259 return 0; 2260 } 2261 2262 void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 2263 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 2264 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 2265 { 2266 log_assert(0); 2267 } 2268 2269 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 2270 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s), 2271 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited)) 2272 { 2273 log_assert(0); 2274 } 2275 2276 void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 2277 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s), 2278 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited)) 2279 { 2280 log_assert(0); 2281 } 2282 2283 void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 2284 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s), 2285 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited)) 2286 { 2287 log_assert(0); 2288 } 2289 2290 int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 2291 { 2292 log_assert(0); 2293 return 0; 2294 } 2295 2296 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 2297 { 2298 log_assert(0); 2299 return 0; 2300 } 2301 2302 int codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 2303 { 2304 log_assert(0); 2305 return 0; 2306 } 2307 2308 #ifdef USE_DNSTAP 2309 void dtio_tap_callback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2310 void* ATTR_UNUSED(arg)) 2311 { 2312 log_assert(0); 2313 } 2314 #endif 2315 2316 #ifdef USE_DNSTAP 2317 void dtio_mainfdcallback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2318 void* ATTR_UNUSED(arg)) 2319 { 2320 log_assert(0); 2321 } 2322 #endif 2323