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/proxy_protocol.h" 70 #include "util/tube.h" 71 #include "util/edns.h" 72 #include "util/timeval_func.h" 73 #include "iterator/iter_fwd.h" 74 #include "iterator/iter_hints.h" 75 #include "iterator/iter_utils.h" 76 #include "validator/autotrust.h" 77 #include "validator/val_anchor.h" 78 #include "respip/respip.h" 79 #include "libunbound/context.h" 80 #include "libunbound/libworker.h" 81 #include "sldns/sbuffer.h" 82 #include "sldns/wire2str.h" 83 #include "util/shm_side/shm_main.h" 84 #include "dnscrypt/dnscrypt.h" 85 #include "dnstap/dtstream.h" 86 87 #ifdef HAVE_SYS_TYPES_H 88 # include <sys/types.h> 89 #endif 90 #ifdef HAVE_NETDB_H 91 #include <netdb.h> 92 #endif 93 #include <signal.h> 94 #ifdef UB_ON_WINDOWS 95 #include "winrc/win_svc.h" 96 #endif 97 98 /** Size of an UDP datagram */ 99 #define NORMAL_UDP_SIZE 512 /* bytes */ 100 /** ratelimit for error responses */ 101 #define ERROR_RATELIMIT 100 /* qps */ 102 103 /** 104 * seconds to add to prefetch leeway. This is a TTL that expires old rrsets 105 * earlier than they should in order to put the new update into the cache. 106 * This additional value is to make sure that if not all TTLs are equal in 107 * the message to be updated(and replaced), that rrsets with up to this much 108 * extra TTL are also replaced. This means that the resulting new message 109 * will have (most likely) this TTL at least, avoiding very small 'split 110 * second' TTLs due to operators choosing relative primes for TTLs (or so). 111 * Also has to be at least one to break ties (and overwrite cached entry). 112 */ 113 #define PREFETCH_EXPIRY_ADD 60 114 115 /** Report on memory usage by this thread and global */ 116 static void 117 worker_mem_report(struct worker* ATTR_UNUSED(worker), 118 struct serviced_query* ATTR_UNUSED(cur_serv)) 119 { 120 #ifdef UNBOUND_ALLOC_STATS 121 /* measure memory leakage */ 122 extern size_t unbound_mem_alloc, unbound_mem_freed; 123 /* debug func in validator module */ 124 size_t total, front, back, mesh, msg, rrset, infra, ac, superac; 125 size_t me, iter, val, anch; 126 int i; 127 #ifdef CLIENT_SUBNET 128 size_t subnet = 0; 129 #endif /* CLIENT_SUBNET */ 130 if(verbosity < VERB_ALGO) 131 return; 132 front = listen_get_mem(worker->front); 133 back = outnet_get_mem(worker->back); 134 msg = slabhash_get_mem(worker->env.msg_cache); 135 rrset = slabhash_get_mem(&worker->env.rrset_cache->table); 136 infra = infra_get_mem(worker->env.infra_cache); 137 mesh = mesh_get_mem(worker->env.mesh); 138 ac = alloc_get_mem(worker->alloc); 139 superac = alloc_get_mem(&worker->daemon->superalloc); 140 anch = anchors_get_mem(worker->env.anchors); 141 iter = 0; 142 val = 0; 143 for(i=0; i<worker->env.mesh->mods.num; i++) { 144 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh-> 145 mods.mod[i]->get_mem)); 146 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0) 147 val += (*worker->env.mesh->mods.mod[i]->get_mem) 148 (&worker->env, i); 149 #ifdef CLIENT_SUBNET 150 else if(strcmp(worker->env.mesh->mods.mod[i]->name, 151 "subnetcache")==0) 152 subnet += (*worker->env.mesh->mods.mod[i]->get_mem) 153 (&worker->env, i); 154 #endif /* CLIENT_SUBNET */ 155 else iter += (*worker->env.mesh->mods.mod[i]->get_mem) 156 (&worker->env, i); 157 } 158 me = sizeof(*worker) + sizeof(*worker->base) + sizeof(*worker->comsig) 159 + comm_point_get_mem(worker->cmd_com) 160 + sizeof(worker->rndstate) 161 + regional_get_mem(worker->scratchpad) 162 + sizeof(*worker->env.scratch_buffer) 163 + sldns_buffer_capacity(worker->env.scratch_buffer); 164 if(worker->daemon->env->fwds) 165 log_info("forwards=%u", (unsigned)forwards_get_mem(worker->env.fwds)); 166 if(worker->daemon->env->hints) 167 log_info("hints=%u", (unsigned)hints_get_mem(worker->env.hints)); 168 if(worker->thread_num == 0) 169 me += acl_list_get_mem(worker->daemon->acl); 170 if(cur_serv) { 171 me += serviced_get_mem(cur_serv); 172 } 173 total = front+back+mesh+msg+rrset+infra+iter+val+ac+superac+me; 174 #ifdef CLIENT_SUBNET 175 total += subnet; 176 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u " 177 "rrset=%u infra=%u iter=%u val=%u subnet=%u anchors=%u " 178 "alloccache=%u globalalloccache=%u me=%u", 179 (unsigned)total, (unsigned)front, (unsigned)back, 180 (unsigned)mesh, (unsigned)msg, (unsigned)rrset, (unsigned)infra, 181 (unsigned)iter, (unsigned)val, 182 (unsigned)subnet, (unsigned)anch, (unsigned)ac, 183 (unsigned)superac, (unsigned)me); 184 #else /* no CLIENT_SUBNET */ 185 log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u " 186 "rrset=%u infra=%u iter=%u val=%u anchors=%u " 187 "alloccache=%u globalalloccache=%u me=%u", 188 (unsigned)total, (unsigned)front, (unsigned)back, 189 (unsigned)mesh, (unsigned)msg, (unsigned)rrset, 190 (unsigned)infra, (unsigned)iter, (unsigned)val, (unsigned)anch, 191 (unsigned)ac, (unsigned)superac, (unsigned)me); 192 #endif /* CLIENT_SUBNET */ 193 log_info("Total heap memory estimate: %u total-alloc: %u " 194 "total-free: %u", (unsigned)total, 195 (unsigned)unbound_mem_alloc, (unsigned)unbound_mem_freed); 196 #else /* no UNBOUND_ALLOC_STATS */ 197 size_t val = 0; 198 #ifdef CLIENT_SUBNET 199 size_t subnet = 0; 200 #endif /* CLIENT_SUBNET */ 201 int i; 202 if(verbosity < VERB_QUERY) 203 return; 204 for(i=0; i<worker->env.mesh->mods.num; i++) { 205 fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh-> 206 mods.mod[i]->get_mem)); 207 if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0) 208 val += (*worker->env.mesh->mods.mod[i]->get_mem) 209 (&worker->env, i); 210 #ifdef CLIENT_SUBNET 211 else if(strcmp(worker->env.mesh->mods.mod[i]->name, 212 "subnetcache")==0) 213 subnet += (*worker->env.mesh->mods.mod[i]->get_mem) 214 (&worker->env, i); 215 #endif /* CLIENT_SUBNET */ 216 } 217 #ifdef CLIENT_SUBNET 218 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u " 219 "subnet=%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), 223 (unsigned)val, (unsigned)subnet); 224 #else /* no CLIENT_SUBNET */ 225 verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u", 226 (unsigned)slabhash_get_mem(worker->env.msg_cache), 227 (unsigned)slabhash_get_mem(&worker->env.rrset_cache->table), 228 (unsigned)infra_get_mem(worker->env.infra_cache), 229 (unsigned)val); 230 #endif /* CLIENT_SUBNET */ 231 #endif /* UNBOUND_ALLOC_STATS */ 232 } 233 234 void 235 worker_send_cmd(struct worker* worker, enum worker_commands cmd) 236 { 237 uint32_t c = (uint32_t)htonl(cmd); 238 if(!tube_write_msg(worker->cmd, (uint8_t*)&c, sizeof(c), 0)) { 239 log_err("worker send cmd %d failed", (int)cmd); 240 } 241 } 242 243 int 244 worker_handle_service_reply(struct comm_point* c, void* arg, int error, 245 struct comm_reply* reply_info) 246 { 247 struct outbound_entry* e = (struct outbound_entry*)arg; 248 struct worker* worker = e->qstate->env->worker; 249 struct serviced_query *sq = e->qsent; 250 251 verbose(VERB_ALGO, "worker svcd callback for qstate %p", e->qstate); 252 if(error != 0) { 253 mesh_report_reply(worker->env.mesh, e, reply_info, error); 254 worker_mem_report(worker, sq); 255 return 0; 256 } 257 /* sanity check. */ 258 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer)) 259 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) != 260 LDNS_PACKET_QUERY 261 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) { 262 /* error becomes timeout for the module as if this reply 263 * never arrived. */ 264 verbose(VERB_ALGO, "worker: bad reply handled as timeout"); 265 mesh_report_reply(worker->env.mesh, e, reply_info, 266 NETEVENT_TIMEOUT); 267 worker_mem_report(worker, sq); 268 return 0; 269 } 270 mesh_report_reply(worker->env.mesh, e, reply_info, NETEVENT_NOERROR); 271 worker_mem_report(worker, sq); 272 return 0; 273 } 274 275 /** ratelimit error replies 276 * @param worker: the worker struct with ratelimit counter 277 * @param err: error code that would be wanted. 278 * @return value of err if okay, or -1 if it should be discarded instead. 279 */ 280 static int 281 worker_err_ratelimit(struct worker* worker, int err) 282 { 283 if(worker->err_limit_time == *worker->env.now) { 284 /* see if limit is exceeded for this second */ 285 if(worker->err_limit_count++ > ERROR_RATELIMIT) 286 return -1; 287 } else { 288 /* new second, new limits */ 289 worker->err_limit_time = *worker->env.now; 290 worker->err_limit_count = 1; 291 } 292 return err; 293 } 294 295 /** 296 * Structure holding the result of the worker_check_request function. 297 * Based on configuration it could be called up to four times; ideally should 298 * be called once. 299 */ 300 struct check_request_result { 301 int checked; 302 int value; 303 }; 304 /** check request sanity. 305 * @param pkt: the wire packet to examine for sanity. 306 * @param worker: parameters for checking. 307 * @param out: struct to update with the result. 308 */ 309 static void 310 worker_check_request(sldns_buffer* pkt, struct worker* worker, 311 struct check_request_result* out) 312 { 313 if(out->checked) return; 314 out->checked = 1; 315 if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) { 316 verbose(VERB_QUERY, "request too short, discarded"); 317 out->value = -1; 318 return; 319 } 320 if(sldns_buffer_limit(pkt) > NORMAL_UDP_SIZE && 321 worker->daemon->cfg->harden_large_queries) { 322 verbose(VERB_QUERY, "request too large, discarded"); 323 out->value = -1; 324 return; 325 } 326 if(LDNS_QR_WIRE(sldns_buffer_begin(pkt))) { 327 verbose(VERB_QUERY, "request has QR bit on, discarded"); 328 out->value = -1; 329 return; 330 } 331 if(LDNS_TC_WIRE(sldns_buffer_begin(pkt))) { 332 LDNS_TC_CLR(sldns_buffer_begin(pkt)); 333 verbose(VERB_QUERY, "request bad, has TC bit on"); 334 out->value = worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 335 return; 336 } 337 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY && 338 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY) { 339 verbose(VERB_QUERY, "request unknown opcode %d", 340 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt))); 341 out->value = worker_err_ratelimit(worker, LDNS_RCODE_NOTIMPL); 342 return; 343 } 344 if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1) { 345 verbose(VERB_QUERY, "request wrong nr qd=%d", 346 LDNS_QDCOUNT(sldns_buffer_begin(pkt))); 347 out->value = worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 348 return; 349 } 350 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 0 && 351 (LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 1 || 352 LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_NOTIFY)) { 353 verbose(VERB_QUERY, "request wrong nr an=%d", 354 LDNS_ANCOUNT(sldns_buffer_begin(pkt))); 355 out->value = worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 356 return; 357 } 358 if(LDNS_NSCOUNT(sldns_buffer_begin(pkt)) != 0) { 359 verbose(VERB_QUERY, "request wrong nr ns=%d", 360 LDNS_NSCOUNT(sldns_buffer_begin(pkt))); 361 out->value = worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 362 return; 363 } 364 if(LDNS_ARCOUNT(sldns_buffer_begin(pkt)) > 1) { 365 verbose(VERB_QUERY, "request wrong nr ar=%d", 366 LDNS_ARCOUNT(sldns_buffer_begin(pkt))); 367 out->value = worker_err_ratelimit(worker, LDNS_RCODE_FORMERR); 368 return; 369 } 370 out->value = 0; 371 return; 372 } 373 374 /** 375 * Send fast-reload acknowledgement to the mainthread in one byte. 376 * This signals that this worker has received the previous command. 377 * The worker is waiting if that is after a reload_stop command. 378 * Or the worker has briefly processed the event itself, and in doing so 379 * released data pointers to old config, after a reload_poll command. 380 */ 381 static void 382 worker_send_reload_ack(struct worker* worker) 383 { 384 /* If this is clipped to 8 bits because thread_num>255, then that 385 * is not a problem, the receiver counts the number of bytes received. 386 * The number is informative only. */ 387 uint8_t c = (uint8_t)worker->thread_num; 388 ssize_t ret; 389 while(1) { 390 ret = send(worker->daemon->fast_reload_thread->commreload[1], 391 (void*)&c, 1, 0); 392 if(ret == -1) { 393 if( 394 #ifndef USE_WINSOCK 395 errno == EINTR || errno == EAGAIN 396 # ifdef EWOULDBLOCK 397 || errno == EWOULDBLOCK 398 # endif 399 #else 400 WSAGetLastError() == WSAEINTR || 401 WSAGetLastError() == WSAEINPROGRESS || 402 WSAGetLastError() == WSAEWOULDBLOCK 403 #endif 404 ) 405 continue; /* Try again. */ 406 log_err("worker reload ack reply: send failed: %s", 407 sock_strerror(errno)); 408 break; 409 } 410 break; 411 } 412 } 413 414 /** stop and wait to resume the worker */ 415 static void 416 worker_stop_and_wait(struct worker* worker) 417 { 418 uint8_t* buf = NULL; 419 uint32_t len = 0, cmd; 420 worker_send_reload_ack(worker); 421 /* wait for reload */ 422 if(!tube_read_msg(worker->cmd, &buf, &len, 0)) { 423 log_err("worker reload read reply failed"); 424 return; 425 } 426 if(len != sizeof(uint32_t)) { 427 log_err("worker reload reply, bad control msg length %d", 428 (int)len); 429 free(buf); 430 return; 431 } 432 cmd = sldns_read_uint32(buf); 433 free(buf); 434 if(cmd == worker_cmd_quit) { 435 /* quit anyway */ 436 verbose(VERB_ALGO, "reload reply, control cmd quit"); 437 comm_base_exit(worker->base); 438 return; 439 } 440 if(cmd != worker_cmd_reload_start) { 441 log_err("worker reload reply, wrong reply command"); 442 } 443 if(worker->daemon->fast_reload_drop_mesh) { 444 verbose(VERB_ALGO, "worker: drop mesh queries after reload"); 445 mesh_delete_all(worker->env.mesh); 446 } 447 fast_reload_worker_pickup_changes(worker); 448 worker_send_reload_ack(worker); 449 verbose(VERB_ALGO, "worker resume after reload"); 450 } 451 452 void 453 worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), uint8_t* msg, 454 size_t len, int error, void* arg) 455 { 456 struct worker* worker = (struct worker*)arg; 457 enum worker_commands cmd; 458 if(error != NETEVENT_NOERROR) { 459 free(msg); 460 if(error == NETEVENT_CLOSED) 461 comm_base_exit(worker->base); 462 else log_info("control event: %d", error); 463 return; 464 } 465 if(len != sizeof(uint32_t)) { 466 fatal_exit("bad control msg length %d", (int)len); 467 } 468 cmd = sldns_read_uint32(msg); 469 free(msg); 470 switch(cmd) { 471 case worker_cmd_quit: 472 verbose(VERB_ALGO, "got control cmd quit"); 473 comm_base_exit(worker->base); 474 break; 475 case worker_cmd_stats: 476 verbose(VERB_ALGO, "got control cmd stats"); 477 server_stats_reply(worker, 1); 478 break; 479 case worker_cmd_stats_noreset: 480 verbose(VERB_ALGO, "got control cmd stats_noreset"); 481 server_stats_reply(worker, 0); 482 break; 483 case worker_cmd_remote: 484 verbose(VERB_ALGO, "got control cmd remote"); 485 daemon_remote_exec(worker); 486 break; 487 case worker_cmd_reload_stop: 488 verbose(VERB_ALGO, "got control cmd reload_stop"); 489 worker_stop_and_wait(worker); 490 break; 491 case worker_cmd_reload_poll: 492 verbose(VERB_ALGO, "got control cmd reload_poll"); 493 fast_reload_worker_pickup_changes(worker); 494 worker_send_reload_ack(worker); 495 break; 496 default: 497 log_err("bad command %d", (int)cmd); 498 break; 499 } 500 } 501 502 /** check if a delegation is secure */ 503 static enum sec_status 504 check_delegation_secure(struct reply_info *rep) 505 { 506 /* return smallest security status */ 507 size_t i; 508 enum sec_status sec = sec_status_secure; 509 enum sec_status s; 510 size_t num = rep->an_numrrsets + rep->ns_numrrsets; 511 /* check if answer and authority are OK */ 512 for(i=0; i<num; i++) { 513 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data) 514 ->security; 515 if(s < sec) 516 sec = s; 517 } 518 /* in additional, only unchecked triggers revalidation */ 519 for(i=num; i<rep->rrset_count; i++) { 520 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data) 521 ->security; 522 if(s == sec_status_unchecked) 523 return s; 524 } 525 return sec; 526 } 527 528 /** remove nonsecure from a delegation referral additional section */ 529 static void 530 deleg_remove_nonsecure_additional(struct reply_info* rep) 531 { 532 /* we can simply edit it, since we are working in the scratch region */ 533 size_t i; 534 enum sec_status s; 535 536 for(i = rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) { 537 s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data) 538 ->security; 539 if(s != sec_status_secure) { 540 memmove(rep->rrsets+i, rep->rrsets+i+1, 541 sizeof(struct ub_packed_rrset_key*)* 542 (rep->rrset_count - i - 1)); 543 rep->ar_numrrsets--; 544 rep->rrset_count--; 545 i--; 546 } 547 } 548 } 549 550 /** answer nonrecursive query from the cache */ 551 static int 552 answer_norec_from_cache(struct worker* worker, struct query_info* qinfo, 553 uint16_t id, uint16_t flags, struct comm_reply* repinfo, 554 struct edns_data* edns) 555 { 556 /* for a nonrecursive query return either: 557 * o an error (servfail; we try to avoid this) 558 * o a delegation (closest we have; this routine tries that) 559 * o the answer (checked by answer_from_cache) 560 * 561 * So, grab a delegation from the rrset cache. 562 * Then check if it needs validation, if so, this routine fails, 563 * so that iterator can prime and validator can verify rrsets. 564 */ 565 uint16_t udpsize = edns->udp_size; 566 int secure = 0; 567 time_t timenow = *worker->env.now; 568 int has_cd_bit = (flags&BIT_CD); 569 int must_validate = (!has_cd_bit || worker->env.cfg->ignore_cd) 570 && worker->env.need_to_validate; 571 struct dns_msg *msg = NULL; 572 struct delegpt *dp; 573 574 dp = dns_cache_find_delegation(&worker->env, qinfo->qname, 575 qinfo->qname_len, qinfo->qtype, qinfo->qclass, 576 worker->scratchpad, &msg, timenow, 0, NULL, 0); 577 if(!dp) { /* no delegation, need to reprime */ 578 return 0; 579 } 580 /* In case we have a local alias, copy it into the delegation message. 581 * Shallow copy should be fine, as we'll be done with msg in this 582 * function. */ 583 msg->qinfo.local_alias = qinfo->local_alias; 584 if(must_validate) { 585 switch(check_delegation_secure(msg->rep)) { 586 case sec_status_unchecked: 587 /* some rrsets have not been verified yet, go and 588 * let validator do that */ 589 return 0; 590 case sec_status_bogus: 591 case sec_status_secure_sentinel_fail: 592 /* some rrsets are bogus, reply servfail */ 593 edns->edns_version = EDNS_ADVERTISED_VERSION; 594 edns->udp_size = EDNS_ADVERTISED_SIZE; 595 edns->ext_rcode = 0; 596 edns->bits &= EDNS_DO; 597 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, 598 msg->rep, LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad, 599 worker->env.now_tv)) 600 return 0; 601 /* Attach the cached EDE (RFC8914) */ 602 if(worker->env.cfg->ede && 603 msg->rep->reason_bogus != LDNS_EDE_NONE) { 604 edns_opt_list_append_ede(&edns->opt_list_out, 605 worker->scratchpad, msg->rep->reason_bogus, 606 msg->rep->reason_bogus_str); 607 } 608 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 609 &msg->qinfo, id, flags, edns); 610 if(worker->stats.extended) { 611 worker->stats.ans_bogus++; 612 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL]++; 613 } 614 return 1; 615 case sec_status_secure: 616 /* all rrsets are secure */ 617 /* remove non-secure rrsets from the add. section*/ 618 if(worker->env.cfg->val_clean_additional) 619 deleg_remove_nonsecure_additional(msg->rep); 620 secure = 1; 621 break; 622 case sec_status_indeterminate: 623 case sec_status_insecure: 624 default: 625 /* not secure */ 626 secure = 0; 627 break; 628 } 629 } 630 /* return this delegation from the cache */ 631 edns->edns_version = EDNS_ADVERTISED_VERSION; 632 edns->udp_size = EDNS_ADVERTISED_SIZE; 633 edns->ext_rcode = 0; 634 edns->bits &= EDNS_DO; 635 if(worker->env.cfg->disable_edns_do && (edns->bits & EDNS_DO)) 636 edns->edns_present = 0; 637 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, msg->rep, 638 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad, 639 worker->env.now_tv)) 640 return 0; 641 msg->rep->flags |= BIT_QR|BIT_RA; 642 /* Attach the cached EDE (RFC8914) if CD bit is set and the answer is 643 * bogus. */ 644 if(worker->env.cfg->ede && has_cd_bit && 645 (check_delegation_secure(msg->rep) == sec_status_bogus || 646 check_delegation_secure(msg->rep) == sec_status_secure_sentinel_fail) && 647 msg->rep->reason_bogus != LDNS_EDE_NONE) { 648 edns_opt_list_append_ede(&edns->opt_list_out, 649 worker->scratchpad, msg->rep->reason_bogus, 650 msg->rep->reason_bogus_str); 651 } 652 if(!reply_info_answer_encode(&msg->qinfo, msg->rep, id, flags, 653 repinfo->c->buffer, 0, 1, worker->scratchpad, 654 udpsize, edns, (int)(edns->bits & EDNS_DO), secure)) { 655 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, NULL, 656 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad, 657 worker->env.now_tv)) 658 edns->opt_list_inplace_cb_out = NULL; 659 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 660 &msg->qinfo, id, flags, edns); 661 } 662 if(worker->stats.extended) { 663 if(secure) worker->stats.ans_secure++; 664 server_stats_insrcode(&worker->stats, repinfo->c->buffer); 665 } 666 return 1; 667 } 668 669 /** Apply, if applicable, a response IP action to a cached answer. 670 * If the answer is rewritten as a result of an action, '*encode_repp' will 671 * point to the reply info containing the modified answer. '*encode_repp' will 672 * be intact otherwise. 673 * It returns 1 on success, 0 otherwise. */ 674 static int 675 apply_respip_action(struct worker* worker, const struct query_info* qinfo, 676 struct respip_client_info* cinfo, struct reply_info* rep, 677 struct sockaddr_storage* addr, socklen_t addrlen, 678 struct ub_packed_rrset_key** alias_rrset, 679 struct reply_info** encode_repp, struct auth_zones* az) 680 { 681 struct respip_action_info actinfo = {0, 0, 0, 0, NULL, 0, NULL}; 682 actinfo.action = respip_none; 683 684 if(qinfo->qtype != LDNS_RR_TYPE_A && 685 qinfo->qtype != LDNS_RR_TYPE_AAAA && 686 qinfo->qtype != LDNS_RR_TYPE_ANY) 687 return 1; 688 689 if(!respip_rewrite_reply(qinfo, cinfo, rep, encode_repp, &actinfo, 690 alias_rrset, 0, worker->scratchpad, az, NULL, 691 worker->env.views, worker->env.respip_set)) 692 return 0; 693 694 /* xxx_deny actions mean dropping the reply, unless the original reply 695 * was redirected to response-ip data. */ 696 if(actinfo.action == respip_always_deny || 697 ((actinfo.action == respip_deny || 698 actinfo.action == respip_inform_deny) && 699 *encode_repp == rep)) 700 *encode_repp = NULL; 701 702 /* If address info is returned, it means the action should be an 703 * 'inform' variant and the information should be logged. */ 704 if(actinfo.addrinfo) { 705 respip_inform_print(&actinfo, qinfo->qname, 706 qinfo->qtype, qinfo->qclass, qinfo->local_alias, 707 addr, addrlen); 708 709 if(worker->stats.extended && actinfo.rpz_used) { 710 if(actinfo.rpz_disabled) 711 worker->stats.rpz_action[RPZ_DISABLED_ACTION]++; 712 if(actinfo.rpz_cname_override) 713 worker->stats.rpz_action[RPZ_CNAME_OVERRIDE_ACTION]++; 714 else 715 worker->stats.rpz_action[ 716 respip_action_to_rpz_action(actinfo.action)]++; 717 } 718 } 719 720 return 1; 721 } 722 723 /** answer query from the cache. 724 * Normally, the answer message will be built in repinfo->c->buffer; if the 725 * answer is supposed to be suppressed or the answer is supposed to be an 726 * incomplete CNAME chain, the buffer is explicitly cleared to signal the 727 * caller as such. In the latter case *partial_rep will point to the incomplete 728 * reply, and this function is (possibly) supposed to be called again with that 729 * *partial_rep value to complete the chain. In addition, if the query should 730 * be completely dropped, '*need_drop' will be set to 1. */ 731 static int 732 answer_from_cache(struct worker* worker, struct query_info* qinfo, 733 struct respip_client_info* cinfo, int* need_drop, int* is_expired_answer, 734 int* is_secure_answer, struct ub_packed_rrset_key** alias_rrset, 735 struct reply_info** partial_repp, 736 struct reply_info* rep, uint16_t id, uint16_t flags, 737 struct comm_reply* repinfo, struct edns_data* edns) 738 { 739 time_t timenow = *worker->env.now; 740 uint16_t udpsize = edns->udp_size; 741 struct reply_info* encode_rep = rep; 742 struct reply_info* partial_rep = *partial_repp; 743 int has_cd_bit = (flags&BIT_CD); 744 int must_validate = (!has_cd_bit || worker->env.cfg->ignore_cd) 745 && worker->env.need_to_validate; 746 *partial_repp = NULL; /* avoid accidental further pass */ 747 748 /* Check TTL */ 749 if(rep->ttl < timenow) { 750 /* Check if we need to serve expired now */ 751 if(worker->env.cfg->serve_expired && 752 /* if serve-expired-client-timeout is set, serve 753 * an expired record without attempting recursion 754 * if the serve_expired_norec_ttl is set for the record 755 * as we know that recursion is currently failing. */ 756 (!worker->env.cfg->serve_expired_client_timeout || 757 timenow < rep->serve_expired_norec_ttl) 758 #ifdef USE_CACHEDB 759 && !(worker->env.cachedb_enabled && 760 worker->env.cfg->cachedb_check_when_serve_expired) 761 #endif 762 ) { 763 if(!reply_info_can_answer_expired(rep, timenow)) 764 return 0; 765 if(!rrset_array_lock(rep->ref, rep->rrset_count, 0)) 766 return 0; 767 *is_expired_answer = 1; 768 } else { 769 /* the rrsets may have been updated in the meantime. 770 * we will refetch the message format from the 771 * authoritative server 772 */ 773 return 0; 774 } 775 } else { 776 if(!rrset_array_lock(rep->ref, rep->rrset_count, timenow)) 777 return 0; 778 } 779 /* locked and ids and ttls are OK. */ 780 781 /* check CNAME chain (if any) */ 782 if(rep->an_numrrsets > 0 && (rep->rrsets[0]->rk.type == 783 htons(LDNS_RR_TYPE_CNAME) || rep->rrsets[0]->rk.type == 784 htons(LDNS_RR_TYPE_DNAME))) { 785 if(!reply_check_cname_chain(qinfo, rep)) { 786 /* cname chain invalid, redo iterator steps */ 787 verbose(VERB_ALGO, "Cache reply: cname chain broken"); 788 goto bail_out; 789 } 790 } 791 /* check security status of the cached answer */ 792 if(must_validate && (rep->security == sec_status_bogus || 793 rep->security == sec_status_secure_sentinel_fail)) { 794 /* BAD cached */ 795 edns->edns_version = EDNS_ADVERTISED_VERSION; 796 edns->udp_size = EDNS_ADVERTISED_SIZE; 797 edns->ext_rcode = 0; 798 edns->bits &= EDNS_DO; 799 if(worker->env.cfg->disable_edns_do && (edns->bits & EDNS_DO)) 800 edns->edns_present = 0; 801 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, NULL, rep, 802 LDNS_RCODE_SERVFAIL, edns, repinfo, worker->scratchpad, 803 worker->env.now_tv)) 804 goto bail_out; 805 /* Attach the cached EDE (RFC8914) */ 806 if(worker->env.cfg->ede && rep->reason_bogus != LDNS_EDE_NONE) { 807 edns_opt_list_append_ede(&edns->opt_list_out, 808 worker->scratchpad, rep->reason_bogus, 809 rep->reason_bogus_str); 810 } 811 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 812 qinfo, id, flags, edns); 813 rrset_array_unlock_touch(worker->env.rrset_cache, 814 worker->scratchpad, rep->ref, rep->rrset_count); 815 if(worker->stats.extended) { 816 worker->stats.ans_bogus ++; 817 worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL] ++; 818 } 819 return 1; 820 } else if(rep->security == sec_status_unchecked && must_validate) { 821 verbose(VERB_ALGO, "Cache reply: unchecked entry needs " 822 "validation"); 823 goto bail_out; /* need to validate cache entry first */ 824 } else if(rep->security == sec_status_secure) { 825 if(reply_all_rrsets_secure(rep)) { 826 *is_secure_answer = 1; 827 } else { 828 if(must_validate) { 829 verbose(VERB_ALGO, "Cache reply: secure entry" 830 " changed status"); 831 goto bail_out; /* rrset changed, re-verify */ 832 } 833 *is_secure_answer = 0; 834 } 835 } else *is_secure_answer = 0; 836 837 edns->edns_version = EDNS_ADVERTISED_VERSION; 838 edns->udp_size = EDNS_ADVERTISED_SIZE; 839 edns->ext_rcode = 0; 840 edns->bits &= EDNS_DO; 841 if(worker->env.cfg->disable_edns_do && (edns->bits & EDNS_DO)) 842 edns->edns_present = 0; 843 *alias_rrset = NULL; /* avoid confusion if caller set it to non-NULL */ 844 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) && 845 !partial_rep && !apply_respip_action(worker, qinfo, cinfo, rep, 846 &repinfo->client_addr, repinfo->client_addrlen, alias_rrset, 847 &encode_rep, worker->env.auth_zones)) { 848 goto bail_out; 849 } else if(partial_rep && 850 !respip_merge_cname(partial_rep, qinfo, rep, cinfo, 851 must_validate, &encode_rep, worker->scratchpad, 852 worker->env.auth_zones, worker->env.views, 853 worker->env.respip_set)) { 854 goto bail_out; 855 } 856 if(encode_rep != rep) { 857 /* if rewritten, it can't be considered "secure" */ 858 *is_secure_answer = 0; 859 } 860 if(!encode_rep || *alias_rrset) { 861 if(!encode_rep) 862 *need_drop = 1; 863 else { 864 /* If a partial CNAME chain is found, we first need to 865 * make a copy of the reply in the scratchpad so we 866 * can release the locks and lookup the cache again. */ 867 *partial_repp = reply_info_copy(encode_rep, NULL, 868 worker->scratchpad); 869 if(!*partial_repp) 870 goto bail_out; 871 } 872 } else { 873 if(*is_expired_answer == 1 && 874 worker->env.cfg->ede_serve_expired && worker->env.cfg->ede) { 875 EDNS_OPT_LIST_APPEND_EDE(&edns->opt_list_out, 876 worker->scratchpad, LDNS_EDE_STALE_ANSWER, ""); 877 } 878 /* Attach the cached EDE (RFC8914) if CD bit is set and the 879 * answer is bogus. */ 880 if(*is_secure_answer == 0 && 881 worker->env.cfg->ede && has_cd_bit && 882 encode_rep->reason_bogus != LDNS_EDE_NONE) { 883 edns_opt_list_append_ede(&edns->opt_list_out, 884 worker->scratchpad, encode_rep->reason_bogus, 885 encode_rep->reason_bogus_str); 886 } 887 if(!inplace_cb_reply_cache_call(&worker->env, qinfo, NULL, encode_rep, 888 (int)(flags&LDNS_RCODE_MASK), edns, repinfo, worker->scratchpad, 889 worker->env.now_tv)) 890 goto bail_out; 891 if(!reply_info_answer_encode(qinfo, encode_rep, id, flags, 892 repinfo->c->buffer, timenow, 1, worker->scratchpad, 893 udpsize, edns, (int)(edns->bits & EDNS_DO), 894 *is_secure_answer)) { 895 if(!inplace_cb_reply_servfail_call(&worker->env, qinfo, 896 NULL, NULL, LDNS_RCODE_SERVFAIL, edns, repinfo, 897 worker->scratchpad, worker->env.now_tv)) 898 edns->opt_list_inplace_cb_out = NULL; 899 error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL, 900 qinfo, id, flags, edns); 901 } 902 } 903 /* cannot send the reply right now, because blocking network syscall 904 * is bad while holding locks. */ 905 rrset_array_unlock_touch(worker->env.rrset_cache, worker->scratchpad, 906 rep->ref, rep->rrset_count); 907 /* go and return this buffer to the client */ 908 return 1; 909 910 bail_out: 911 rrset_array_unlock_touch(worker->env.rrset_cache, 912 worker->scratchpad, rep->ref, rep->rrset_count); 913 return 0; 914 } 915 916 /** Reply to client and perform prefetch to keep cache up to date. */ 917 static void 918 reply_and_prefetch(struct worker* worker, struct query_info* qinfo, 919 uint16_t flags, struct comm_reply* repinfo, time_t leeway, int noreply, 920 int rpz_passthru, struct edns_option* opt_list) 921 { 922 (void)opt_list; 923 /* first send answer to client to keep its latency 924 * as small as a cachereply */ 925 if(!noreply) { 926 if(repinfo->c->tcp_req_info) { 927 sldns_buffer_copy( 928 repinfo->c->tcp_req_info->spool_buffer, 929 repinfo->c->buffer); 930 } 931 comm_point_send_reply(repinfo); 932 } 933 server_stats_prefetch(&worker->stats, worker); 934 #ifdef CLIENT_SUBNET 935 /* Check if the subnet module is enabled. In that case pass over the 936 * comm_reply information for ECS generation later. The mesh states are 937 * unique when subnet is enabled. */ 938 if(modstack_find(&worker->env.mesh->mods, "subnetcache") != -1 939 && worker->env.unique_mesh) { 940 mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway + 941 PREFETCH_EXPIRY_ADD, rpz_passthru, 942 &repinfo->client_addr, opt_list); 943 return; 944 } 945 #endif 946 /* create the prefetch in the mesh as a normal lookup without 947 * client addrs waiting, which has the cache blacklisted (to bypass 948 * the cache and go to the network for the data). */ 949 /* this (potentially) runs the mesh for the new query */ 950 mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway + 951 PREFETCH_EXPIRY_ADD, rpz_passthru, NULL, NULL); 952 } 953 954 /** 955 * Fill CH class answer into buffer. Keeps query. 956 * @param pkt: buffer 957 * @param str: string to put into text record (<255). 958 * array of strings, every string becomes a text record. 959 * @param num: number of strings in array. 960 * @param edns: edns reply information. 961 * @param worker: worker with scratch region. 962 * @param repinfo: reply information for a communication point. 963 */ 964 static void 965 chaos_replystr(sldns_buffer* pkt, char** str, int num, struct edns_data* edns, 966 struct worker* worker, struct comm_reply* repinfo) 967 { 968 int i; 969 unsigned int rd = LDNS_RD_WIRE(sldns_buffer_begin(pkt)); 970 unsigned int cd = LDNS_CD_WIRE(sldns_buffer_begin(pkt)); 971 size_t udpsize = edns->udp_size; 972 edns->edns_version = EDNS_ADVERTISED_VERSION; 973 edns->udp_size = EDNS_ADVERTISED_SIZE; 974 edns->bits &= EDNS_DO; 975 if(!inplace_cb_reply_local_call(&worker->env, NULL, NULL, NULL, 976 LDNS_RCODE_NOERROR, edns, repinfo, worker->scratchpad, 977 worker->env.now_tv)) 978 edns->opt_list_inplace_cb_out = NULL; 979 sldns_buffer_clear(pkt); 980 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip id */ 981 sldns_buffer_write_u16(pkt, (uint16_t)(BIT_QR|BIT_RA)); 982 if(rd) LDNS_RD_SET(sldns_buffer_begin(pkt)); 983 if(cd) LDNS_CD_SET(sldns_buffer_begin(pkt)); 984 sldns_buffer_write_u16(pkt, 1); /* qdcount */ 985 sldns_buffer_write_u16(pkt, (uint16_t)num); /* ancount */ 986 sldns_buffer_write_u16(pkt, 0); /* nscount */ 987 sldns_buffer_write_u16(pkt, 0); /* arcount */ 988 (void)query_dname_len(pkt); /* skip qname */ 989 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qtype */ 990 sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qclass */ 991 for(i=0; i<num; i++) { 992 size_t len = strlen(str[i]); 993 if(len>255) len=255; /* cap size of TXT record */ 994 if(sldns_buffer_position(pkt)+2+2+2+4+2+1+len+ 995 calc_edns_field_size(edns) > udpsize) { 996 sldns_buffer_write_u16_at(pkt, 6, i); /* ANCOUNT */ 997 LDNS_TC_SET(sldns_buffer_begin(pkt)); 998 break; 999 } 1000 sldns_buffer_write_u16(pkt, 0xc00c); /* compr ptr to query */ 1001 sldns_buffer_write_u16(pkt, LDNS_RR_TYPE_TXT); 1002 sldns_buffer_write_u16(pkt, LDNS_RR_CLASS_CH); 1003 sldns_buffer_write_u32(pkt, 0); /* TTL */ 1004 sldns_buffer_write_u16(pkt, sizeof(uint8_t) + len); 1005 sldns_buffer_write_u8(pkt, len); 1006 sldns_buffer_write(pkt, str[i], len); 1007 } 1008 sldns_buffer_flip(pkt); 1009 if(sldns_buffer_capacity(pkt) >= 1010 sldns_buffer_limit(pkt)+calc_edns_field_size(edns)) 1011 attach_edns_record(pkt, edns); 1012 } 1013 1014 /** Reply with one string */ 1015 static void 1016 chaos_replyonestr(sldns_buffer* pkt, const char* str, struct edns_data* edns, 1017 struct worker* worker, struct comm_reply* repinfo) 1018 { 1019 chaos_replystr(pkt, (char**)&str, 1, edns, worker, repinfo); 1020 } 1021 1022 /** 1023 * Create CH class trustanchor answer. 1024 * @param pkt: buffer 1025 * @param edns: edns reply information. 1026 * @param w: worker with scratch region. 1027 * @param repinfo: reply information for a communication point. 1028 */ 1029 static void 1030 chaos_trustanchor(sldns_buffer* pkt, struct edns_data* edns, struct worker* w, 1031 struct comm_reply* repinfo) 1032 { 1033 #define TA_RESPONSE_MAX_TXT 16 /* max number of TXT records */ 1034 #define TA_RESPONSE_MAX_TAGS 32 /* max number of tags printed per zone */ 1035 char* str_array[TA_RESPONSE_MAX_TXT]; 1036 uint16_t tags[TA_RESPONSE_MAX_TAGS]; 1037 int num = 0; 1038 struct trust_anchor* ta; 1039 1040 if(!w->env.need_to_validate) { 1041 /* no validator module, reply no trustanchors */ 1042 chaos_replystr(pkt, NULL, 0, edns, w, repinfo); 1043 return; 1044 } 1045 1046 /* fill the string with contents */ 1047 lock_basic_lock(&w->env.anchors->lock); 1048 RBTREE_FOR(ta, struct trust_anchor*, w->env.anchors->tree) { 1049 char* str; 1050 size_t i, numtag, str_len = 255; 1051 if(num == TA_RESPONSE_MAX_TXT) continue; 1052 str = (char*)regional_alloc(w->scratchpad, str_len); 1053 if(!str) continue; 1054 lock_basic_lock(&ta->lock); 1055 numtag = anchor_list_keytags(ta, tags, TA_RESPONSE_MAX_TAGS); 1056 if(numtag == 0) { 1057 /* empty, insecure point */ 1058 lock_basic_unlock(&ta->lock); 1059 continue; 1060 } 1061 str_array[num] = str; 1062 num++; 1063 1064 /* spool name of anchor */ 1065 (void)sldns_wire2str_dname_buf(ta->name, ta->namelen, str, str_len); 1066 str_len -= strlen(str); str += strlen(str); 1067 /* spool tags */ 1068 for(i=0; i<numtag; i++) { 1069 snprintf(str, str_len, " %u", (unsigned)tags[i]); 1070 str_len -= strlen(str); str += strlen(str); 1071 } 1072 lock_basic_unlock(&ta->lock); 1073 } 1074 lock_basic_unlock(&w->env.anchors->lock); 1075 1076 chaos_replystr(pkt, str_array, num, edns, w, repinfo); 1077 regional_free_all(w->scratchpad); 1078 } 1079 1080 /** 1081 * Answer CH class queries. 1082 * @param w: worker 1083 * @param qinfo: query info. Pointer into packet buffer. 1084 * @param edns: edns info from query. 1085 * @param repinfo: reply information for a communication point. 1086 * @param pkt: packet buffer. 1087 * @return: true if a reply is to be sent. 1088 */ 1089 static int 1090 answer_chaos(struct worker* w, struct query_info* qinfo, 1091 struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* pkt) 1092 { 1093 struct config_file* cfg = w->env.cfg; 1094 if(qinfo->qtype != LDNS_RR_TYPE_ANY && qinfo->qtype != LDNS_RR_TYPE_TXT) 1095 return 0; 1096 if(query_dname_compare(qinfo->qname, 1097 (uint8_t*)"\002id\006server") == 0 || 1098 query_dname_compare(qinfo->qname, 1099 (uint8_t*)"\010hostname\004bind") == 0) 1100 { 1101 if(cfg->hide_identity) 1102 return 0; 1103 if(cfg->identity==NULL || cfg->identity[0]==0) { 1104 char buf[MAXHOSTNAMELEN+1]; 1105 if (gethostname(buf, MAXHOSTNAMELEN) == 0) { 1106 buf[MAXHOSTNAMELEN] = 0; 1107 chaos_replyonestr(pkt, buf, edns, w, repinfo); 1108 } else { 1109 log_err("gethostname: %s", strerror(errno)); 1110 chaos_replyonestr(pkt, "no hostname", edns, w, repinfo); 1111 } 1112 } 1113 else chaos_replyonestr(pkt, cfg->identity, edns, w, repinfo); 1114 return 1; 1115 } 1116 if(query_dname_compare(qinfo->qname, 1117 (uint8_t*)"\007version\006server") == 0 || 1118 query_dname_compare(qinfo->qname, 1119 (uint8_t*)"\007version\004bind") == 0) 1120 { 1121 if(cfg->hide_version) 1122 return 0; 1123 if(cfg->version==NULL || cfg->version[0]==0) 1124 chaos_replyonestr(pkt, PACKAGE_STRING, edns, w, repinfo); 1125 else chaos_replyonestr(pkt, cfg->version, edns, w, repinfo); 1126 return 1; 1127 } 1128 if(query_dname_compare(qinfo->qname, 1129 (uint8_t*)"\013trustanchor\007unbound") == 0) 1130 { 1131 if(cfg->hide_trustanchor) 1132 return 0; 1133 chaos_trustanchor(pkt, edns, w, repinfo); 1134 return 1; 1135 } 1136 1137 return 0; 1138 } 1139 1140 /** 1141 * Answer notify queries. These are notifies for authoritative zones, 1142 * the reply is an ack that the notify has been received. We need to check 1143 * access permission here. 1144 * @param w: worker 1145 * @param qinfo: query info. Pointer into packet buffer. 1146 * @param edns: edns info from query. 1147 * @param addr: client address. 1148 * @param addrlen: client address length. 1149 * @param pkt: packet buffer. 1150 */ 1151 static void 1152 answer_notify(struct worker* w, struct query_info* qinfo, 1153 struct edns_data* edns, sldns_buffer* pkt, 1154 struct sockaddr_storage* addr, socklen_t addrlen) 1155 { 1156 int refused = 0; 1157 int rcode = LDNS_RCODE_NOERROR; 1158 uint32_t serial = 0; 1159 int has_serial; 1160 if(!w->env.auth_zones) return; 1161 has_serial = auth_zone_parse_notify_serial(pkt, &serial); 1162 if(auth_zones_notify(w->env.auth_zones, &w->env, qinfo->qname, 1163 qinfo->qname_len, qinfo->qclass, addr, 1164 addrlen, has_serial, serial, &refused)) { 1165 rcode = LDNS_RCODE_NOERROR; 1166 } else { 1167 if(refused) 1168 rcode = LDNS_RCODE_REFUSED; 1169 else rcode = LDNS_RCODE_SERVFAIL; 1170 } 1171 1172 if(verbosity >= VERB_DETAIL) { 1173 char buf[380]; 1174 char zname[LDNS_MAX_DOMAINLEN]; 1175 char sr[25]; 1176 dname_str(qinfo->qname, zname); 1177 sr[0]=0; 1178 if(has_serial) 1179 snprintf(sr, sizeof(sr), "serial %u ", 1180 (unsigned)serial); 1181 if(rcode == LDNS_RCODE_REFUSED) 1182 snprintf(buf, sizeof(buf), 1183 "refused NOTIFY %sfor %s from", sr, zname); 1184 else if(rcode == LDNS_RCODE_SERVFAIL) 1185 snprintf(buf, sizeof(buf), 1186 "servfail for NOTIFY %sfor %s from", sr, zname); 1187 else snprintf(buf, sizeof(buf), 1188 "received NOTIFY %sfor %s from", sr, zname); 1189 log_addr(VERB_DETAIL, buf, addr, addrlen); 1190 } 1191 edns->edns_version = EDNS_ADVERTISED_VERSION; 1192 edns->udp_size = EDNS_ADVERTISED_SIZE; 1193 edns->ext_rcode = 0; 1194 edns->bits &= EDNS_DO; 1195 error_encode(pkt, rcode, qinfo, 1196 *(uint16_t*)(void *)sldns_buffer_begin(pkt), 1197 sldns_buffer_read_u16_at(pkt, 2), edns); 1198 LDNS_OPCODE_SET(sldns_buffer_begin(pkt), LDNS_PACKET_NOTIFY); 1199 } 1200 1201 static int 1202 deny_refuse(struct comm_point* c, enum acl_access acl, 1203 enum acl_access deny, enum acl_access refuse, 1204 struct worker* worker, struct comm_reply* repinfo, 1205 struct acl_addr* acladdr, int ede, 1206 struct check_request_result* check_result) 1207 { 1208 if(acl == deny) { 1209 if(verbosity >= VERB_ALGO) { 1210 log_acl_action("dropped", &repinfo->client_addr, 1211 repinfo->client_addrlen, acl, acladdr); 1212 log_buf(VERB_ALGO, "dropped", c->buffer); 1213 } 1214 comm_point_drop_reply(repinfo); 1215 if(worker->stats.extended) 1216 worker->stats.unwanted_queries++; 1217 return 0; 1218 } else if(acl == refuse) { 1219 size_t opt_rr_mark; 1220 1221 if(verbosity >= VERB_ALGO) { 1222 log_acl_action("refused", &repinfo->client_addr, 1223 repinfo->client_addrlen, acl, acladdr); 1224 log_buf(VERB_ALGO, "refuse", c->buffer); 1225 } 1226 1227 if(worker->stats.extended) 1228 worker->stats.unwanted_queries++; 1229 worker_check_request(c->buffer, worker, check_result); 1230 if(check_result->value != 0) { 1231 if(check_result->value != -1) { 1232 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1233 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1234 check_result->value); 1235 return 1; 1236 } 1237 comm_point_drop_reply(repinfo); 1238 return 0; 1239 } 1240 /* worker_check_request() above guarantees that the buffer contains at 1241 * least a header and that qdcount == 1 1242 */ 1243 log_assert(sldns_buffer_limit(c->buffer) >= LDNS_HEADER_SIZE 1244 && LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) == 1); 1245 1246 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); /* skip header */ 1247 1248 /* check additional section is present and that we respond with EDEs */ 1249 if(LDNS_ARCOUNT(sldns_buffer_begin(c->buffer)) != 1 1250 || !ede) { 1251 LDNS_QDCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1252 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1253 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1254 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1255 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1256 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1257 LDNS_RCODE_REFUSED); 1258 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1259 sldns_buffer_flip(c->buffer); 1260 return 1; 1261 } 1262 1263 if (!query_dname_len(c->buffer)) { 1264 LDNS_QDCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1265 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1266 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1267 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1268 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1269 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1270 LDNS_RCODE_FORMERR); 1271 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1272 sldns_buffer_flip(c->buffer); 1273 return 1; 1274 } 1275 /* space available for query type and class? */ 1276 if (sldns_buffer_remaining(c->buffer) < 2 * sizeof(uint16_t)) { 1277 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1278 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1279 LDNS_RCODE_FORMERR); 1280 LDNS_QDCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1281 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1282 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1283 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1284 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1285 sldns_buffer_flip(c->buffer); 1286 return 1; 1287 } 1288 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1289 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1290 LDNS_RCODE_REFUSED); 1291 1292 sldns_buffer_skip(c->buffer, (ssize_t)sizeof(uint16_t)); /* skip qtype */ 1293 1294 sldns_buffer_skip(c->buffer, (ssize_t)sizeof(uint16_t)); /* skip qclass */ 1295 1296 /* The OPT RR to be returned should come directly after 1297 * the query, so mark this spot. 1298 */ 1299 opt_rr_mark = sldns_buffer_position(c->buffer); 1300 1301 /* Skip through the RR records */ 1302 if(LDNS_ANCOUNT(sldns_buffer_begin(c->buffer)) != 0 || 1303 LDNS_NSCOUNT(sldns_buffer_begin(c->buffer)) != 0) { 1304 if(!skip_pkt_rrs(c->buffer, 1305 ((int)LDNS_ANCOUNT(sldns_buffer_begin(c->buffer)))+ 1306 ((int)LDNS_NSCOUNT(sldns_buffer_begin(c->buffer))))) { 1307 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1308 LDNS_RCODE_FORMERR); 1309 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1310 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1311 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1312 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1313 sldns_buffer_flip(c->buffer); 1314 return 1; 1315 } 1316 } 1317 /* Do we have a valid OPT RR here? If not return REFUSED (could be a valid TSIG or something so no FORMERR) */ 1318 /* domain name must be the root of length 1. */ 1319 if(sldns_buffer_remaining(c->buffer) < 1 || *sldns_buffer_current(c->buffer) != 0) { 1320 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1321 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1322 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1323 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1324 sldns_buffer_flip(c->buffer); 1325 return 1; 1326 } else { 1327 sldns_buffer_skip(c->buffer, 1); /* skip root label */ 1328 } 1329 if(sldns_buffer_remaining(c->buffer) < 2 || 1330 sldns_buffer_read_u16(c->buffer) != LDNS_RR_TYPE_OPT) { 1331 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1332 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1333 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1334 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1335 sldns_buffer_flip(c->buffer); 1336 return 1; 1337 } 1338 /* Write OPT RR directly after the query, 1339 * so without the (possibly skipped) Answer and NS RRs 1340 */ 1341 LDNS_ANCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1342 LDNS_NSCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1343 sldns_buffer_clear(c->buffer); /* reset write limit */ 1344 sldns_buffer_set_position(c->buffer, opt_rr_mark); 1345 1346 /* Check if OPT record can be written 1347 * 17 == root label (1) + RR type (2) + UDP Size (2) 1348 * + Fields (4) + rdata len (2) + EDE Option code (2) 1349 * + EDE Option length (2) + EDE info-code (2) 1350 */ 1351 if (sldns_buffer_available(c->buffer, 17) == 0) { 1352 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 0); 1353 sldns_buffer_flip(c->buffer); 1354 return 1; 1355 } 1356 1357 LDNS_ARCOUNT_SET(sldns_buffer_begin(c->buffer), 1); 1358 1359 /* root label */ 1360 sldns_buffer_write_u8(c->buffer, 0); 1361 sldns_buffer_write_u16(c->buffer, LDNS_RR_TYPE_OPT); 1362 sldns_buffer_write_u16(c->buffer, EDNS_ADVERTISED_SIZE); 1363 1364 /* write OPT Record TTL Field */ 1365 sldns_buffer_write_u32(c->buffer, 0); 1366 1367 /* write rdata len: EDE option + length + info-code */ 1368 sldns_buffer_write_u16(c->buffer, 6); 1369 1370 /* write OPTIONS; add EDE option code */ 1371 sldns_buffer_write_u16(c->buffer, LDNS_EDNS_EDE); 1372 1373 /* write single EDE option length (for just 1 info-code) */ 1374 sldns_buffer_write_u16(c->buffer, 2); 1375 1376 /* write single EDE info-code */ 1377 sldns_buffer_write_u16(c->buffer, LDNS_EDE_PROHIBITED); 1378 1379 sldns_buffer_flip(c->buffer); 1380 1381 verbose(VERB_ALGO, "attached EDE code: %d", LDNS_EDE_PROHIBITED); 1382 1383 return 1; 1384 1385 } 1386 1387 return -1; 1388 } 1389 1390 static int 1391 deny_refuse_all(struct comm_point* c, enum acl_access* acl, 1392 struct worker* worker, struct comm_reply* repinfo, 1393 struct acl_addr** acladdr, int ede, int check_proxy, 1394 struct check_request_result* check_result) 1395 { 1396 if(check_proxy) { 1397 *acladdr = acl_addr_lookup(worker->daemon->acl, 1398 &repinfo->remote_addr, repinfo->remote_addrlen); 1399 } else { 1400 *acladdr = acl_addr_lookup(worker->daemon->acl, 1401 &repinfo->client_addr, repinfo->client_addrlen); 1402 } 1403 /* If there is no ACL based on client IP use the interface ACL. */ 1404 if(!(*acladdr) && c->socket) { 1405 *acladdr = c->socket->acl; 1406 } 1407 *acl = acl_get_control(*acladdr); 1408 return deny_refuse(c, *acl, acl_deny, acl_refuse, worker, repinfo, 1409 *acladdr, ede, check_result); 1410 } 1411 1412 static int 1413 deny_refuse_non_local(struct comm_point* c, enum acl_access acl, 1414 struct worker* worker, struct comm_reply* repinfo, 1415 struct acl_addr* acladdr, int ede, 1416 struct check_request_result* check_result) 1417 { 1418 return deny_refuse(c, acl, acl_deny_non_local, acl_refuse_non_local, 1419 worker, repinfo, acladdr, ede, check_result); 1420 } 1421 1422 /* Check if the query is blocked by source IP rate limiting. 1423 * Returns 1 if it passes the check, 0 otherwise. */ 1424 static int 1425 check_ip_ratelimit(struct worker* worker, struct sockaddr_storage* addr, 1426 socklen_t addrlen, int has_cookie, sldns_buffer* pkt) 1427 { 1428 if(!infra_ip_ratelimit_inc(worker->env.infra_cache, addr, addrlen, 1429 *worker->env.now, has_cookie, 1430 worker->env.cfg->ip_ratelimit_backoff, pkt)) { 1431 /* See if we can pass through with slip factor */ 1432 if(!has_cookie && worker->env.cfg->ip_ratelimit_factor != 0 && 1433 ub_random_max(worker->env.rnd, 1434 worker->env.cfg->ip_ratelimit_factor) == 0) { 1435 char addrbuf[128]; 1436 addr_to_str(addr, addrlen, addrbuf, sizeof(addrbuf)); 1437 verbose(VERB_QUERY, "ip_ratelimit allowed through for " 1438 "ip address %s because of slip in " 1439 "ip_ratelimit_factor", addrbuf); 1440 return 1; 1441 } 1442 return 0; 1443 } 1444 return 1; 1445 } 1446 1447 int 1448 worker_handle_request(struct comm_point* c, void* arg, int error, 1449 struct comm_reply* repinfo) 1450 { 1451 struct worker* worker = (struct worker*)arg; 1452 int ret; 1453 hashvalue_type h; 1454 struct lruhash_entry* e; 1455 struct query_info qinfo; 1456 struct edns_data edns; 1457 struct edns_option* original_edns_list = NULL; 1458 enum acl_access acl; 1459 struct acl_addr* acladdr; 1460 int pre_edns_ip_ratelimit = 1; 1461 int rc = 0; 1462 int need_drop = 0; 1463 int is_expired_answer = 0; 1464 int is_secure_answer = 0; 1465 int rpz_passthru = 0; 1466 long long wait_queue_time = 0; 1467 /* We might have to chase a CNAME chain internally, in which case 1468 * we'll have up to two replies and combine them to build a complete 1469 * answer. These variables control this case. */ 1470 struct ub_packed_rrset_key* alias_rrset = NULL; 1471 struct reply_info* partial_rep = NULL; 1472 struct query_info* lookup_qinfo = &qinfo; 1473 struct query_info qinfo_tmp; /* placeholder for lookup_qinfo */ 1474 struct respip_client_info* cinfo = NULL, cinfo_tmp; 1475 struct timeval wait_time; 1476 struct check_request_result check_result = {0,0}; 1477 memset(&qinfo, 0, sizeof(qinfo)); 1478 1479 if((error != NETEVENT_NOERROR && error != NETEVENT_DONE)|| !repinfo) { 1480 /* some bad tcp query DNS formats give these error calls */ 1481 verbose(VERB_ALGO, "handle request called with err=%d", error); 1482 return 0; 1483 } 1484 1485 if (worker->env.cfg->sock_queue_timeout && timeval_isset(&c->recv_tv)) { 1486 timeval_subtract(&wait_time, worker->env.now_tv, &c->recv_tv); 1487 wait_queue_time = wait_time.tv_sec * 1000000 + wait_time.tv_usec; 1488 if (worker->stats.max_query_time_us < wait_queue_time) 1489 worker->stats.max_query_time_us = wait_queue_time; 1490 if(wait_queue_time > 1491 (long long)(worker->env.cfg->sock_queue_timeout * 1000000)) { 1492 /* count and drop queries that were sitting in the socket queue too long */ 1493 worker->stats.num_queries_timed_out++; 1494 return 0; 1495 } 1496 } 1497 1498 #ifdef USE_DNSCRYPT 1499 repinfo->max_udp_size = worker->daemon->cfg->max_udp_size; 1500 if(!dnsc_handle_curved_request(worker->daemon->dnscenv, repinfo)) { 1501 worker->stats.num_query_dnscrypt_crypted_malformed++; 1502 return 0; 1503 } 1504 if(c->dnscrypt && !repinfo->is_dnscrypted) { 1505 char buf[LDNS_MAX_DOMAINLEN]; 1506 /* Check if this is unencrypted and asking for certs */ 1507 worker_check_request(c->buffer, worker, &check_result); 1508 if(check_result.value != 0) { 1509 verbose(VERB_ALGO, 1510 "dnscrypt: worker check request: bad query."); 1511 log_addr(VERB_CLIENT,"from",&repinfo->client_addr, 1512 repinfo->client_addrlen); 1513 comm_point_drop_reply(repinfo); 1514 return 0; 1515 } 1516 if(!query_info_parse(&qinfo, c->buffer)) { 1517 verbose(VERB_ALGO, 1518 "dnscrypt: worker parse request: formerror."); 1519 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1520 repinfo->client_addrlen); 1521 comm_point_drop_reply(repinfo); 1522 return 0; 1523 } 1524 dname_str(qinfo.qname, buf); 1525 if(!(qinfo.qtype == LDNS_RR_TYPE_TXT && 1526 strcasecmp(buf, 1527 worker->daemon->dnscenv->provider_name) == 0)) { 1528 verbose(VERB_ALGO, 1529 "dnscrypt: not TXT \"%s\". Received: %s \"%s\"", 1530 worker->daemon->dnscenv->provider_name, 1531 sldns_rr_descript(qinfo.qtype)->_name, 1532 buf); 1533 comm_point_drop_reply(repinfo); 1534 worker->stats.num_query_dnscrypt_cleartext++; 1535 return 0; 1536 } 1537 worker->stats.num_query_dnscrypt_cert++; 1538 sldns_buffer_rewind(c->buffer); 1539 } else if(c->dnscrypt && repinfo->is_dnscrypted) { 1540 worker->stats.num_query_dnscrypt_crypted++; 1541 } 1542 #endif 1543 #ifdef USE_DNSTAP 1544 /* 1545 * sending src (client)/dst (local service) addresses over DNSTAP from incoming request handler 1546 */ 1547 if(worker->dtenv.log_client_query_messages) { 1548 log_addr(VERB_ALGO, "request from client", &repinfo->client_addr, repinfo->client_addrlen); 1549 log_addr(VERB_ALGO, "to local addr", (void*)repinfo->c->socket->addr, repinfo->c->socket->addrlen); 1550 dt_msg_send_client_query(&worker->dtenv, &repinfo->client_addr, (void*)repinfo->c->socket->addr, c->type, c->ssl, c->buffer, 1551 ((worker->env.cfg->sock_queue_timeout && timeval_isset(&c->recv_tv))?&c->recv_tv:NULL)); 1552 } 1553 #endif 1554 /* Check deny/refuse ACLs */ 1555 if(repinfo->is_proxied) { 1556 if((ret=deny_refuse_all(c, &acl, worker, repinfo, &acladdr, 1557 worker->env.cfg->ede, 1, &check_result)) != -1) { 1558 if(ret == 1) 1559 goto send_reply; 1560 return ret; 1561 } 1562 } 1563 if((ret=deny_refuse_all(c, &acl, worker, repinfo, &acladdr, 1564 worker->env.cfg->ede, 0, &check_result)) != -1) { 1565 if(ret == 1) 1566 goto send_reply; 1567 return ret; 1568 } 1569 1570 worker_check_request(c->buffer, worker, &check_result); 1571 if(check_result.value != 0) { 1572 verbose(VERB_ALGO, "worker check request: bad query."); 1573 log_addr(VERB_CLIENT,"from",&repinfo->client_addr, repinfo->client_addrlen); 1574 if(check_result.value != -1) { 1575 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1576 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1577 check_result.value); 1578 return 1; 1579 } 1580 comm_point_drop_reply(repinfo); 1581 return 0; 1582 } 1583 1584 worker->stats.num_queries++; 1585 pre_edns_ip_ratelimit = !worker->env.cfg->do_answer_cookie 1586 || sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE 1587 || LDNS_ARCOUNT(sldns_buffer_begin(c->buffer)) == 0; 1588 1589 /* If the IP rate limiting check needs extra EDNS information (e.g., 1590 * DNS Cookies) postpone the check until after EDNS is parsed. */ 1591 if(pre_edns_ip_ratelimit) { 1592 /* NOTE: we always check the repinfo->client_address. 1593 * IP ratelimiting is implicitly disabled for proxies. */ 1594 if(!check_ip_ratelimit(worker, &repinfo->client_addr, 1595 repinfo->client_addrlen, 0, c->buffer)) { 1596 worker->stats.num_queries_ip_ratelimited++; 1597 comm_point_drop_reply(repinfo); 1598 return 0; 1599 } 1600 } 1601 1602 if(!query_info_parse(&qinfo, c->buffer)) { 1603 verbose(VERB_ALGO, "worker parse request: formerror."); 1604 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1605 repinfo->client_addrlen); 1606 memset(&qinfo, 0, sizeof(qinfo)); /* zero qinfo.qname */ 1607 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) { 1608 comm_point_drop_reply(repinfo); 1609 return 0; 1610 } 1611 sldns_buffer_rewind(c->buffer); 1612 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1613 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1614 LDNS_RCODE_FORMERR); 1615 goto send_reply; 1616 } 1617 if(worker->env.cfg->log_queries) { 1618 char ip[128]; 1619 addr_to_str(&repinfo->client_addr, repinfo->client_addrlen, ip, sizeof(ip)); 1620 log_query_in(ip, qinfo.qname, qinfo.qtype, qinfo.qclass); 1621 } 1622 if(qinfo.qtype == LDNS_RR_TYPE_AXFR || 1623 qinfo.qtype == LDNS_RR_TYPE_IXFR) { 1624 verbose(VERB_ALGO, "worker request: refused zone transfer."); 1625 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1626 repinfo->client_addrlen); 1627 sldns_buffer_rewind(c->buffer); 1628 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1629 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1630 LDNS_RCODE_REFUSED); 1631 if(worker->stats.extended) { 1632 worker->stats.qtype[qinfo.qtype]++; 1633 } 1634 goto send_reply; 1635 } 1636 if(qinfo.qtype == LDNS_RR_TYPE_OPT || 1637 qinfo.qtype == LDNS_RR_TYPE_TSIG || 1638 qinfo.qtype == LDNS_RR_TYPE_TKEY || 1639 qinfo.qtype == LDNS_RR_TYPE_MAILA || 1640 qinfo.qtype == LDNS_RR_TYPE_MAILB || 1641 (qinfo.qtype >= 128 && qinfo.qtype <= 248)) { 1642 verbose(VERB_ALGO, "worker request: formerror for meta-type."); 1643 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1644 repinfo->client_addrlen); 1645 if(worker_err_ratelimit(worker, LDNS_RCODE_FORMERR) == -1) { 1646 comm_point_drop_reply(repinfo); 1647 return 0; 1648 } 1649 sldns_buffer_rewind(c->buffer); 1650 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1651 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1652 LDNS_RCODE_FORMERR); 1653 if(worker->stats.extended) { 1654 worker->stats.qtype[qinfo.qtype]++; 1655 } 1656 goto send_reply; 1657 } 1658 if((ret=parse_edns_from_query_pkt( 1659 c->buffer, &edns, worker->env.cfg, c, repinfo, 1660 (worker->env.now ? *worker->env.now : time(NULL)), 1661 worker->scratchpad, 1662 worker->daemon->cookie_secrets)) != 0) { 1663 struct edns_data reply_edns; 1664 verbose(VERB_ALGO, "worker parse edns: formerror."); 1665 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1666 repinfo->client_addrlen); 1667 memset(&reply_edns, 0, sizeof(reply_edns)); 1668 reply_edns.edns_present = 1; 1669 error_encode(c->buffer, ret, &qinfo, 1670 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1671 sldns_buffer_read_u16_at(c->buffer, 2), &reply_edns); 1672 regional_free_all(worker->scratchpad); 1673 goto send_reply; 1674 } 1675 if(edns.edns_present) { 1676 if(edns.edns_version != 0) { 1677 edns.opt_list_in = NULL; 1678 edns.opt_list_out = NULL; 1679 edns.opt_list_inplace_cb_out = NULL; 1680 verbose(VERB_ALGO, "query with bad edns version."); 1681 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1682 repinfo->client_addrlen); 1683 extended_error_encode(c->buffer, EDNS_RCODE_BADVERS, &qinfo, 1684 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1685 sldns_buffer_read_u16_at(c->buffer, 2), 0, &edns); 1686 regional_free_all(worker->scratchpad); 1687 goto send_reply; 1688 } 1689 if(edns.udp_size < NORMAL_UDP_SIZE && 1690 worker->daemon->cfg->harden_short_bufsize) { 1691 verbose(VERB_QUERY, "worker request: EDNS bufsize %d ignored", 1692 (int)edns.udp_size); 1693 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1694 repinfo->client_addrlen); 1695 edns.udp_size = NORMAL_UDP_SIZE; 1696 } 1697 } 1698 1699 /* Get stats for cookies */ 1700 server_stats_downstream_cookie(&worker->stats, &edns); 1701 1702 /* If the IP rate limiting check was postponed, check now. */ 1703 if(!pre_edns_ip_ratelimit) { 1704 /* NOTE: we always check the repinfo->client_address. 1705 * IP ratelimiting is implicitly disabled for proxies. */ 1706 if(!check_ip_ratelimit(worker, &repinfo->client_addr, 1707 repinfo->client_addrlen, edns.cookie_valid, 1708 c->buffer)) { 1709 worker->stats.num_queries_ip_ratelimited++; 1710 comm_point_drop_reply(repinfo); 1711 return 0; 1712 } 1713 } 1714 1715 /* "if, else if" sequence below deals with downstream DNS Cookies */ 1716 if(acl != acl_allow_cookie) 1717 ; /* pass; No cookie downstream processing whatsoever */ 1718 1719 else if(edns.cookie_valid) 1720 ; /* pass; Valid cookie is good! */ 1721 1722 else if(c->type != comm_udp) 1723 ; /* pass; Stateful transport */ 1724 1725 else if(edns.cookie_present) { 1726 /* Cookie present, but not valid: Cookie was bad! */ 1727 extended_error_encode(c->buffer, 1728 LDNS_EXT_RCODE_BADCOOKIE, &qinfo, 1729 *(uint16_t*)(void *) 1730 sldns_buffer_begin(c->buffer), 1731 sldns_buffer_read_u16_at(c->buffer, 2), 1732 0, &edns); 1733 regional_free_all(worker->scratchpad); 1734 goto send_reply; 1735 } else { 1736 /* Cookie required, but no cookie present on UDP */ 1737 verbose(VERB_ALGO, "worker request: " 1738 "need cookie or stateful transport"); 1739 log_addr(VERB_ALGO, "from",&repinfo->remote_addr 1740 , repinfo->remote_addrlen); 1741 EDNS_OPT_LIST_APPEND_EDE(&edns.opt_list_out, 1742 worker->scratchpad, LDNS_EDE_OTHER, 1743 "DNS Cookie needed for UDP replies"); 1744 error_encode(c->buffer, 1745 (LDNS_RCODE_REFUSED|BIT_TC), &qinfo, 1746 *(uint16_t*)(void *) 1747 sldns_buffer_begin(c->buffer), 1748 sldns_buffer_read_u16_at(c->buffer, 2), 1749 &edns); 1750 regional_free_all(worker->scratchpad); 1751 goto send_reply; 1752 } 1753 1754 if(edns.udp_size > worker->daemon->cfg->max_udp_size && 1755 c->type == comm_udp) { 1756 verbose(VERB_QUERY, 1757 "worker request: max UDP reply size modified" 1758 " (%d to max-udp-size)", (int)edns.udp_size); 1759 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1760 repinfo->client_addrlen); 1761 edns.udp_size = worker->daemon->cfg->max_udp_size; 1762 } 1763 if(edns.udp_size < LDNS_HEADER_SIZE) { 1764 verbose(VERB_ALGO, "worker request: edns is too small."); 1765 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1766 repinfo->client_addrlen); 1767 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1768 LDNS_TC_SET(sldns_buffer_begin(c->buffer)); 1769 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1770 LDNS_RCODE_SERVFAIL); 1771 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1772 sldns_buffer_write_at(c->buffer, 4, 1773 (uint8_t*)"\0\0\0\0\0\0\0\0", 8); 1774 sldns_buffer_flip(c->buffer); 1775 regional_free_all(worker->scratchpad); 1776 goto send_reply; 1777 } 1778 if(worker->stats.extended) 1779 server_stats_insquery(&worker->stats, c, qinfo.qtype, 1780 qinfo.qclass, &edns, repinfo); 1781 if(c->type != comm_udp) 1782 edns.udp_size = 65535; /* max size for TCP replies */ 1783 if(qinfo.qclass == LDNS_RR_CLASS_CH && answer_chaos(worker, &qinfo, 1784 &edns, repinfo, c->buffer)) { 1785 regional_free_all(worker->scratchpad); 1786 goto send_reply; 1787 } 1788 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) == 1789 LDNS_PACKET_NOTIFY) { 1790 answer_notify(worker, &qinfo, &edns, c->buffer, 1791 &repinfo->client_addr, repinfo->client_addrlen); 1792 regional_free_all(worker->scratchpad); 1793 goto send_reply; 1794 } 1795 if(local_zones_answer(worker->daemon->local_zones, &worker->env, &qinfo, 1796 &edns, c->buffer, worker->scratchpad, repinfo, acladdr->taglist, 1797 acladdr->taglen, acladdr->tag_actions, 1798 acladdr->tag_actions_size, acladdr->tag_datas, 1799 acladdr->tag_datas_size, worker->daemon->cfg->tagname, 1800 worker->daemon->cfg->num_tags, acladdr->view)) { 1801 regional_free_all(worker->scratchpad); 1802 if(sldns_buffer_limit(c->buffer) == 0) { 1803 comm_point_drop_reply(repinfo); 1804 return 0; 1805 } 1806 goto send_reply; 1807 } 1808 if(worker->env.auth_zones && 1809 rpz_callback_from_worker_request(worker->env.auth_zones, 1810 &worker->env, &qinfo, &edns, c->buffer, worker->scratchpad, 1811 repinfo, acladdr->taglist, acladdr->taglen, &worker->stats, 1812 &rpz_passthru)) { 1813 regional_free_all(worker->scratchpad); 1814 if(sldns_buffer_limit(c->buffer) == 0) { 1815 comm_point_drop_reply(repinfo); 1816 return 0; 1817 } 1818 goto send_reply; 1819 } 1820 if(worker->env.auth_zones && 1821 auth_zones_answer(worker->env.auth_zones, &worker->env, 1822 &qinfo, &edns, repinfo, c->buffer, worker->scratchpad)) { 1823 regional_free_all(worker->scratchpad); 1824 if(sldns_buffer_limit(c->buffer) == 0) { 1825 comm_point_drop_reply(repinfo); 1826 return 0; 1827 } 1828 /* set RA for everyone that can have recursion (based on 1829 * access control list) */ 1830 if(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer)) && 1831 acl != acl_deny_non_local && acl != acl_refuse_non_local) 1832 LDNS_RA_SET(sldns_buffer_begin(c->buffer)); 1833 goto send_reply; 1834 } 1835 1836 /* We've looked in our local zones. If the answer isn't there, we 1837 * might need to bail out based on ACLs now. */ 1838 if((ret=deny_refuse_non_local(c, acl, worker, repinfo, acladdr, 1839 worker->env.cfg->ede, &check_result)) != -1) 1840 { 1841 regional_free_all(worker->scratchpad); 1842 if(ret == 1) 1843 goto send_reply; 1844 return ret; 1845 } 1846 1847 /* If this request does not have the recursion bit set, verify 1848 * ACLs allow the recursion bit to be treated as set. */ 1849 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) && 1850 acl == acl_allow_setrd ) { 1851 LDNS_RD_SET(sldns_buffer_begin(c->buffer)); 1852 } 1853 1854 /* If this request does not have the recursion bit set, verify 1855 * ACLs allow the snooping. */ 1856 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) && 1857 acl != acl_allow_snoop ) { 1858 if(worker->env.cfg->ede) { 1859 EDNS_OPT_LIST_APPEND_EDE(&edns.opt_list_out, 1860 worker->scratchpad, LDNS_EDE_NOT_AUTHORITATIVE, ""); 1861 } 1862 error_encode(c->buffer, LDNS_RCODE_REFUSED, &qinfo, 1863 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1864 sldns_buffer_read_u16_at(c->buffer, 2), &edns); 1865 regional_free_all(worker->scratchpad); 1866 log_addr(VERB_ALGO, "refused nonrec (cache snoop) query from", 1867 &repinfo->client_addr, repinfo->client_addrlen); 1868 1869 goto send_reply; 1870 } 1871 1872 /* If we've found a local alias, replace the qname with the alias 1873 * target before resolving it. */ 1874 if(qinfo.local_alias) { 1875 struct ub_packed_rrset_key* rrset = qinfo.local_alias->rrset; 1876 struct packed_rrset_data* d = rrset->entry.data; 1877 1878 /* Sanity check: our current implementation only supports 1879 * a single CNAME RRset as a local alias. */ 1880 if(qinfo.local_alias->next || 1881 rrset->rk.type != htons(LDNS_RR_TYPE_CNAME) || 1882 d->count != 1) { 1883 log_err("assumption failure: unexpected local alias"); 1884 regional_free_all(worker->scratchpad); 1885 return 0; /* drop it */ 1886 } 1887 qinfo.qname = d->rr_data[0] + 2; 1888 qinfo.qname_len = d->rr_len[0] - 2; 1889 } 1890 1891 /* If we may apply IP-based actions to the answer, build the client 1892 * information. As this can be expensive, skip it if there is 1893 * absolutely no possibility of it. */ 1894 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) && 1895 (qinfo.qtype == LDNS_RR_TYPE_A || 1896 qinfo.qtype == LDNS_RR_TYPE_AAAA || 1897 qinfo.qtype == LDNS_RR_TYPE_ANY)) { 1898 cinfo_tmp.taglist = acladdr->taglist; 1899 cinfo_tmp.taglen = acladdr->taglen; 1900 cinfo_tmp.tag_actions = acladdr->tag_actions; 1901 cinfo_tmp.tag_actions_size = acladdr->tag_actions_size; 1902 cinfo_tmp.tag_datas = acladdr->tag_datas; 1903 cinfo_tmp.tag_datas_size = acladdr->tag_datas_size; 1904 cinfo_tmp.view = acladdr->view; 1905 cinfo_tmp.view_name = NULL; 1906 cinfo = &cinfo_tmp; 1907 } 1908 1909 /* Keep the original edns list around. The pointer could change if there is 1910 * a cached answer (through the inplace callback function there). 1911 * No need to actually copy the contents as they shouldn't change. 1912 * Used while prefetching and subnet is enabled. */ 1913 original_edns_list = edns.opt_list_in; 1914 lookup_cache: 1915 /* Lookup the cache. In case we chase an intermediate CNAME chain 1916 * this is a two-pass operation, and lookup_qinfo is different for 1917 * each pass. We should still pass the original qinfo to 1918 * answer_from_cache(), however, since it's used to build the reply. */ 1919 if(!edns_bypass_cache_stage(edns.opt_list_in, &worker->env)) { 1920 is_expired_answer = 0; 1921 is_secure_answer = 0; 1922 h = query_info_hash(lookup_qinfo, sldns_buffer_read_u16_at(c->buffer, 2)); 1923 if((e=slabhash_lookup(worker->env.msg_cache, h, lookup_qinfo, 0))) { 1924 struct reply_info* rep = (struct reply_info*)e->data; 1925 /* answer from cache - we have acquired a readlock on it */ 1926 if(answer_from_cache(worker, &qinfo, cinfo, &need_drop, 1927 &is_expired_answer, &is_secure_answer, 1928 &alias_rrset, &partial_rep, rep, 1929 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1930 sldns_buffer_read_u16_at(c->buffer, 2), repinfo, 1931 &edns)) { 1932 /* prefetch it if the prefetch TTL expired. 1933 * Note that if there is more than one pass 1934 * its qname must be that used for cache 1935 * lookup. */ 1936 if((worker->env.cfg->prefetch && 1937 rep->prefetch_ttl <= *worker->env.now) || 1938 (worker->env.cfg->serve_expired && 1939 rep->ttl < *worker->env.now && 1940 !(*worker->env.now < rep->serve_expired_norec_ttl))) { 1941 time_t leeway = rep->ttl - *worker->env.now; 1942 if(rep->ttl < *worker->env.now) 1943 leeway = 0; 1944 lock_rw_unlock(&e->lock); 1945 1946 reply_and_prefetch(worker, lookup_qinfo, 1947 sldns_buffer_read_u16_at(c->buffer, 2), 1948 repinfo, leeway, 1949 (partial_rep || need_drop), 1950 rpz_passthru, 1951 original_edns_list); 1952 if(!partial_rep) { 1953 rc = 0; 1954 regional_free_all(worker->scratchpad); 1955 goto send_reply_rc; 1956 } 1957 } else if(!partial_rep) { 1958 lock_rw_unlock(&e->lock); 1959 regional_free_all(worker->scratchpad); 1960 goto send_reply; 1961 } else { 1962 /* Note that we've already released the 1963 * lock if we're here after prefetch. */ 1964 lock_rw_unlock(&e->lock); 1965 } 1966 /* We've found a partial reply ending with an 1967 * alias. Replace the lookup qinfo for the 1968 * alias target and lookup the cache again to 1969 * (possibly) complete the reply. As we're 1970 * passing the "base" reply, there will be no 1971 * more alias chasing. */ 1972 memset(&qinfo_tmp, 0, sizeof(qinfo_tmp)); 1973 get_cname_target(alias_rrset, &qinfo_tmp.qname, 1974 &qinfo_tmp.qname_len); 1975 if(!qinfo_tmp.qname) { 1976 log_err("unexpected: invalid answer alias"); 1977 regional_free_all(worker->scratchpad); 1978 return 0; /* drop query */ 1979 } 1980 qinfo_tmp.qtype = qinfo.qtype; 1981 qinfo_tmp.qclass = qinfo.qclass; 1982 lookup_qinfo = &qinfo_tmp; 1983 goto lookup_cache; 1984 } 1985 verbose(VERB_ALGO, "answer from the cache failed"); 1986 lock_rw_unlock(&e->lock); 1987 } 1988 1989 if(!LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) { 1990 if(answer_norec_from_cache(worker, &qinfo, 1991 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1992 sldns_buffer_read_u16_at(c->buffer, 2), repinfo, 1993 &edns)) { 1994 regional_free_all(worker->scratchpad); 1995 goto send_reply; 1996 } 1997 verbose(VERB_ALGO, "answer norec from cache -- " 1998 "need to validate or not primed"); 1999 } 2000 } 2001 sldns_buffer_rewind(c->buffer); 2002 server_stats_querymiss(&worker->stats, worker); 2003 2004 if(verbosity >= VERB_CLIENT) { 2005 if(c->type == comm_udp) 2006 log_addr(VERB_CLIENT, "udp request from", 2007 &repinfo->client_addr, repinfo->client_addrlen); 2008 else log_addr(VERB_CLIENT, "tcp request from", 2009 &repinfo->client_addr, repinfo->client_addrlen); 2010 } 2011 2012 /* grab a work request structure for this new request */ 2013 mesh_new_client(worker->env.mesh, &qinfo, cinfo, 2014 sldns_buffer_read_u16_at(c->buffer, 2), 2015 &edns, repinfo, *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 2016 rpz_passthru); 2017 regional_free_all(worker->scratchpad); 2018 worker_mem_report(worker, NULL); 2019 return 0; 2020 2021 send_reply: 2022 rc = 1; 2023 send_reply_rc: 2024 if(need_drop) { 2025 comm_point_drop_reply(repinfo); 2026 return 0; 2027 } 2028 if(is_expired_answer) { 2029 worker->stats.ans_expired++; 2030 } 2031 server_stats_insrcode(&worker->stats, c->buffer); 2032 if(worker->stats.extended) { 2033 if(is_secure_answer) worker->stats.ans_secure++; 2034 } 2035 #ifdef USE_DNSTAP 2036 /* 2037 * sending src (client)/dst (local service) addresses over DNSTAP from send_reply code label (when we serviced local zone for ex.) 2038 */ 2039 if(worker->dtenv.log_client_response_messages && rc !=0) { 2040 log_addr(VERB_ALGO, "from local addr", (void*)repinfo->c->socket->addr, repinfo->c->socket->addrlen); 2041 log_addr(VERB_ALGO, "response to client", &repinfo->client_addr, repinfo->client_addrlen); 2042 dt_msg_send_client_response(&worker->dtenv, &repinfo->client_addr, (void*)repinfo->c->socket->addr, c->type, c->ssl, c->buffer); 2043 } 2044 #endif 2045 if(worker->env.cfg->log_replies) 2046 { 2047 struct timeval tv; 2048 memset(&tv, 0, sizeof(tv)); 2049 if(qinfo.local_alias && qinfo.local_alias->rrset && 2050 qinfo.local_alias->rrset->rk.dname) { 2051 /* log original qname, before the local alias was 2052 * used to resolve that CNAME to something else */ 2053 qinfo.qname = qinfo.local_alias->rrset->rk.dname; 2054 log_reply_info(NO_VERBOSE, &qinfo, 2055 &repinfo->client_addr, repinfo->client_addrlen, 2056 tv, 1, c->buffer, 2057 (worker->env.cfg->log_destaddr?(void*)repinfo->c->socket->addr:NULL), 2058 c->type, c->ssl); 2059 } else { 2060 log_reply_info(NO_VERBOSE, &qinfo, 2061 &repinfo->client_addr, repinfo->client_addrlen, 2062 tv, 1, c->buffer, 2063 (worker->env.cfg->log_destaddr?(void*)repinfo->c->socket->addr:NULL), 2064 c->type, c->ssl); 2065 } 2066 } 2067 #ifdef USE_DNSCRYPT 2068 if(!dnsc_handle_uncurved_request(repinfo)) { 2069 return 0; 2070 } 2071 #endif 2072 return rc; 2073 } 2074 2075 void 2076 worker_sighandler(int sig, void* arg) 2077 { 2078 /* note that log, print, syscalls here give race conditions. 2079 * And cause hangups if the log-lock is held by the application. */ 2080 struct worker* worker = (struct worker*)arg; 2081 switch(sig) { 2082 #ifdef SIGHUP 2083 case SIGHUP: 2084 comm_base_exit(worker->base); 2085 break; 2086 #endif 2087 #ifdef SIGBREAK 2088 case SIGBREAK: 2089 #endif 2090 case SIGINT: 2091 worker->need_to_exit = 1; 2092 comm_base_exit(worker->base); 2093 break; 2094 #ifdef SIGQUIT 2095 case SIGQUIT: 2096 worker->need_to_exit = 1; 2097 comm_base_exit(worker->base); 2098 break; 2099 #endif 2100 case SIGTERM: 2101 worker->need_to_exit = 1; 2102 comm_base_exit(worker->base); 2103 break; 2104 default: 2105 /* unknown signal, ignored */ 2106 break; 2107 } 2108 } 2109 2110 /** restart statistics timer for worker, if enabled */ 2111 static void 2112 worker_restart_timer(struct worker* worker) 2113 { 2114 if(worker->env.cfg->stat_interval > 0) { 2115 struct timeval tv; 2116 #ifndef S_SPLINT_S 2117 tv.tv_sec = worker->env.cfg->stat_interval; 2118 tv.tv_usec = 0; 2119 #endif 2120 comm_timer_set(worker->stat_timer, &tv); 2121 } 2122 } 2123 2124 void worker_stat_timer_cb(void* arg) 2125 { 2126 struct worker* worker = (struct worker*)arg; 2127 server_stats_log(&worker->stats, worker, worker->thread_num); 2128 mesh_stats(worker->env.mesh, "mesh has"); 2129 worker_mem_report(worker, NULL); 2130 /* SHM is enabled, process data to SHM */ 2131 if (worker->daemon->cfg->shm_enable) { 2132 shm_main_run(worker); 2133 } 2134 if(!worker->daemon->cfg->stat_cumulative) { 2135 worker_stats_clear(worker); 2136 } 2137 /* start next timer */ 2138 worker_restart_timer(worker); 2139 } 2140 2141 void worker_probe_timer_cb(void* arg) 2142 { 2143 struct worker* worker = (struct worker*)arg; 2144 struct timeval tv; 2145 #ifndef S_SPLINT_S 2146 tv.tv_sec = (time_t)autr_probe_timer(&worker->env); 2147 tv.tv_usec = 0; 2148 #endif 2149 if(tv.tv_sec != 0) 2150 comm_timer_set(worker->env.probe_timer, &tv); 2151 } 2152 2153 struct worker* 2154 worker_create(struct daemon* daemon, int id, int* ports, int n) 2155 { 2156 unsigned int seed; 2157 struct worker* worker = (struct worker*)calloc(1, 2158 sizeof(struct worker)); 2159 if(!worker) 2160 return NULL; 2161 worker->numports = n; 2162 worker->ports = (int*)memdup(ports, sizeof(int)*n); 2163 if(!worker->ports) { 2164 free(worker); 2165 return NULL; 2166 } 2167 worker->daemon = daemon; 2168 worker->thread_num = id; 2169 if(!(worker->cmd = tube_create())) { 2170 free(worker->ports); 2171 free(worker); 2172 return NULL; 2173 } 2174 /* create random state here to avoid locking trouble in RAND_bytes */ 2175 if(!(worker->rndstate = ub_initstate(daemon->rand))) { 2176 log_err("could not init random numbers."); 2177 tube_delete(worker->cmd); 2178 free(worker->ports); 2179 free(worker); 2180 return NULL; 2181 } 2182 explicit_bzero(&seed, sizeof(seed)); 2183 return worker; 2184 } 2185 2186 int 2187 worker_init(struct worker* worker, struct config_file *cfg, 2188 struct listen_port* ports, int do_sigs) 2189 { 2190 #ifdef USE_DNSTAP 2191 struct dt_env* dtenv = &worker->dtenv; 2192 #else 2193 void* dtenv = NULL; 2194 #endif 2195 #ifdef HAVE_GETTID 2196 worker->thread_tid = gettid(); 2197 #endif 2198 worker->need_to_exit = 0; 2199 worker->base = comm_base_create(do_sigs); 2200 if(!worker->base) { 2201 log_err("could not create event handling base"); 2202 worker_delete(worker); 2203 return 0; 2204 } 2205 comm_base_set_slow_accept_handlers(worker->base, &worker_stop_accept, 2206 &worker_start_accept, worker); 2207 if(do_sigs) { 2208 #ifdef SIGHUP 2209 ub_thread_sig_unblock(SIGHUP); 2210 #endif 2211 #ifdef SIGBREAK 2212 ub_thread_sig_unblock(SIGBREAK); 2213 #endif 2214 ub_thread_sig_unblock(SIGINT); 2215 #ifdef SIGQUIT 2216 ub_thread_sig_unblock(SIGQUIT); 2217 #endif 2218 ub_thread_sig_unblock(SIGTERM); 2219 #ifndef LIBEVENT_SIGNAL_PROBLEM 2220 worker->comsig = comm_signal_create(worker->base, 2221 worker_sighandler, worker); 2222 if(!worker->comsig 2223 #ifdef SIGHUP 2224 || !comm_signal_bind(worker->comsig, SIGHUP) 2225 #endif 2226 #ifdef SIGQUIT 2227 || !comm_signal_bind(worker->comsig, SIGQUIT) 2228 #endif 2229 || !comm_signal_bind(worker->comsig, SIGTERM) 2230 #ifdef SIGBREAK 2231 || !comm_signal_bind(worker->comsig, SIGBREAK) 2232 #endif 2233 || !comm_signal_bind(worker->comsig, SIGINT)) { 2234 log_err("could not create signal handlers"); 2235 worker_delete(worker); 2236 return 0; 2237 } 2238 #endif /* LIBEVENT_SIGNAL_PROBLEM */ 2239 if(!daemon_remote_open_accept(worker->daemon->rc, 2240 worker->daemon->rc_ports, worker)) { 2241 worker_delete(worker); 2242 return 0; 2243 } 2244 #ifdef UB_ON_WINDOWS 2245 wsvc_setup_worker(worker); 2246 #endif /* UB_ON_WINDOWS */ 2247 } else { /* !do_sigs */ 2248 worker->comsig = NULL; 2249 } 2250 #ifdef USE_DNSTAP 2251 if(cfg->dnstap) { 2252 log_assert(worker->daemon->dtenv != NULL); 2253 memcpy(&worker->dtenv, worker->daemon->dtenv, sizeof(struct dt_env)); 2254 if(!dt_init(&worker->dtenv, worker->base)) 2255 fatal_exit("dt_init failed"); 2256 } 2257 #endif 2258 worker->front = listen_create(worker->base, ports, 2259 cfg->msg_buffer_size, (int)cfg->incoming_num_tcp, 2260 cfg->do_tcp_keepalive 2261 ? cfg->tcp_keepalive_timeout 2262 : cfg->tcp_idle_timeout, 2263 cfg->harden_large_queries, cfg->http_max_streams, 2264 cfg->http_endpoint, cfg->http_notls_downstream, 2265 worker->daemon->tcl, worker->daemon->listen_dot_sslctx, 2266 worker->daemon->listen_doh_sslctx, 2267 worker->daemon->listen_quic_sslctx, 2268 dtenv, worker->daemon->doq_table, worker->env.rnd, 2269 cfg, worker_handle_request, worker); 2270 if(!worker->front) { 2271 log_err("could not create listening sockets"); 2272 worker_delete(worker); 2273 return 0; 2274 } 2275 worker->back = outside_network_create(worker->base, 2276 cfg->msg_buffer_size, (size_t)cfg->outgoing_num_ports, 2277 cfg->out_ifs, cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6, 2278 cfg->do_tcp?cfg->outgoing_num_tcp:0, cfg->ip_dscp, 2279 worker->daemon->env->infra_cache, worker->rndstate, 2280 cfg->use_caps_bits_for_id, worker->ports, worker->numports, 2281 cfg->unwanted_threshold, cfg->outgoing_tcp_mss, 2282 &worker_alloc_cleanup, worker, 2283 cfg->do_udp || cfg->udp_upstream_without_downstream, 2284 worker->daemon->connect_dot_sslctx, cfg->delay_close, 2285 cfg->tls_use_sni, dtenv, cfg->udp_connect, 2286 cfg->max_reuse_tcp_queries, cfg->tcp_reuse_timeout, 2287 cfg->tcp_auth_query_timeout); 2288 if(!worker->back) { 2289 log_err("could not create outgoing sockets"); 2290 worker_delete(worker); 2291 return 0; 2292 } 2293 iterator_set_ip46_support(&worker->daemon->mods, worker->daemon->env, 2294 worker->back); 2295 /* start listening to commands */ 2296 if(!tube_setup_bg_listen(worker->cmd, worker->base, 2297 &worker_handle_control_cmd, worker)) { 2298 log_err("could not create control compt."); 2299 worker_delete(worker); 2300 return 0; 2301 } 2302 worker->stat_timer = comm_timer_create(worker->base, 2303 worker_stat_timer_cb, worker); 2304 if(!worker->stat_timer) { 2305 log_err("could not create statistics timer"); 2306 } 2307 2308 /* we use the msg_buffer_size as a good estimate for what the 2309 * user wants for memory usage sizes */ 2310 worker->scratchpad = regional_create_custom(cfg->msg_buffer_size); 2311 if(!worker->scratchpad) { 2312 log_err("malloc failure"); 2313 worker_delete(worker); 2314 return 0; 2315 } 2316 2317 server_stats_init(&worker->stats, cfg); 2318 worker->alloc = worker->daemon->worker_allocs[worker->thread_num]; 2319 alloc_set_id_cleanup(worker->alloc, &worker_alloc_cleanup, worker); 2320 worker->env = *worker->daemon->env; 2321 comm_base_timept(worker->base, &worker->env.now, &worker->env.now_tv); 2322 worker->env.worker = worker; 2323 worker->env.worker_base = worker->base; 2324 worker->env.send_query = &worker_send_query; 2325 worker->env.alloc = worker->alloc; 2326 worker->env.outnet = worker->back; 2327 worker->env.rnd = worker->rndstate; 2328 /* If case prefetch is triggered, the corresponding mesh will clear 2329 * the scratchpad for the module env in the middle of request handling. 2330 * It would be prone to a use-after-free kind of bug, so we avoid 2331 * sharing it with worker's own scratchpad at the cost of having 2332 * one more pad per worker. */ 2333 worker->env.scratch = regional_create_custom(cfg->msg_buffer_size); 2334 if(!worker->env.scratch) { 2335 log_err("malloc failure"); 2336 worker_delete(worker); 2337 return 0; 2338 } 2339 worker->env.mesh = mesh_create(&worker->daemon->mods, &worker->env); 2340 if(!worker->env.mesh) { 2341 log_err("malloc failure"); 2342 worker_delete(worker); 2343 return 0; 2344 } 2345 /* Pass on daemon variables that we would need in the mesh area */ 2346 worker->env.mesh->use_response_ip = worker->daemon->use_response_ip; 2347 worker->env.mesh->use_rpz = worker->daemon->use_rpz; 2348 2349 worker->env.detach_subs = &mesh_detach_subs; 2350 worker->env.attach_sub = &mesh_attach_sub; 2351 worker->env.add_sub = &mesh_add_sub; 2352 worker->env.kill_sub = &mesh_state_delete; 2353 worker->env.detect_cycle = &mesh_detect_cycle; 2354 worker->env.scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size); 2355 if(!worker->env.scratch_buffer) { 2356 log_err("malloc failure"); 2357 worker_delete(worker); 2358 return 0; 2359 } 2360 /* one probe timer per process -- if we have 5011 anchors */ 2361 if(autr_get_num_anchors(worker->env.anchors) > 0 2362 #ifndef THREADS_DISABLED 2363 && worker->thread_num == 0 2364 #endif 2365 ) { 2366 struct timeval tv; 2367 tv.tv_sec = 0; 2368 tv.tv_usec = 0; 2369 worker->env.probe_timer = comm_timer_create(worker->base, 2370 worker_probe_timer_cb, worker); 2371 if(!worker->env.probe_timer) { 2372 log_err("could not create 5011-probe timer"); 2373 } else { 2374 /* let timer fire, then it can reset itself */ 2375 comm_timer_set(worker->env.probe_timer, &tv); 2376 } 2377 } 2378 /* zone transfer tasks, setup once per process, if any */ 2379 if(worker->env.auth_zones 2380 #ifndef THREADS_DISABLED 2381 && worker->thread_num == 0 2382 #endif 2383 ) { 2384 auth_xfer_pickup_initial(worker->env.auth_zones, &worker->env); 2385 auth_zones_pickup_zonemd_verify(worker->env.auth_zones, 2386 &worker->env); 2387 } 2388 #ifdef USE_DNSTAP 2389 if(worker->daemon->cfg->dnstap 2390 #ifndef THREADS_DISABLED 2391 && worker->thread_num == 0 2392 #endif 2393 ) { 2394 if(!dt_io_thread_start(dtenv->dtio, comm_base_internal( 2395 worker->base), worker->daemon->num)) { 2396 log_err("could not start dnstap io thread"); 2397 worker_delete(worker); 2398 return 0; 2399 } 2400 } 2401 #endif /* USE_DNSTAP */ 2402 worker_mem_report(worker, NULL); 2403 /* if statistics enabled start timer */ 2404 if(worker->env.cfg->stat_interval > 0) { 2405 verbose(VERB_ALGO, "set statistics interval %d secs", 2406 worker->env.cfg->stat_interval); 2407 worker_restart_timer(worker); 2408 } 2409 pp_init(&sldns_write_uint16, &sldns_write_uint32); 2410 return 1; 2411 } 2412 2413 void 2414 worker_work(struct worker* worker) 2415 { 2416 comm_base_dispatch(worker->base); 2417 } 2418 2419 void 2420 worker_delete(struct worker* worker) 2421 { 2422 if(!worker) 2423 return; 2424 if(worker->env.mesh && verbosity >= VERB_OPS) { 2425 server_stats_log(&worker->stats, worker, worker->thread_num); 2426 mesh_stats(worker->env.mesh, "mesh has"); 2427 worker_mem_report(worker, NULL); 2428 } 2429 outside_network_quit_prepare(worker->back); 2430 mesh_delete(worker->env.mesh); 2431 sldns_buffer_free(worker->env.scratch_buffer); 2432 listen_delete(worker->front); 2433 outside_network_delete(worker->back); 2434 comm_signal_delete(worker->comsig); 2435 tube_delete(worker->cmd); 2436 comm_timer_delete(worker->stat_timer); 2437 comm_timer_delete(worker->env.probe_timer); 2438 free(worker->ports); 2439 if(worker->thread_num == 0) { 2440 #ifdef UB_ON_WINDOWS 2441 wsvc_desetup_worker(worker); 2442 #endif /* UB_ON_WINDOWS */ 2443 } 2444 #ifdef USE_DNSTAP 2445 if(worker->daemon->cfg->dnstap 2446 #ifndef THREADS_DISABLED 2447 && worker->thread_num == 0 2448 #endif 2449 ) { 2450 dt_io_thread_stop(worker->dtenv.dtio); 2451 } 2452 dt_deinit(&worker->dtenv); 2453 #endif /* USE_DNSTAP */ 2454 comm_base_delete(worker->base); 2455 ub_randfree(worker->rndstate); 2456 /* don't touch worker->alloc, as it's maintained in daemon */ 2457 regional_destroy(worker->env.scratch); 2458 regional_destroy(worker->scratchpad); 2459 free(worker); 2460 } 2461 2462 struct outbound_entry* 2463 worker_send_query(struct query_info* qinfo, uint16_t flags, int dnssec, 2464 int want_dnssec, int nocaps, int check_ratelimit, 2465 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone, 2466 size_t zonelen, int tcp_upstream, int ssl_upstream, char* tls_auth_name, 2467 struct module_qstate* q, int* was_ratelimited) 2468 { 2469 struct worker* worker = q->env->worker; 2470 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 2471 q->region, sizeof(*e)); 2472 if(!e) 2473 return NULL; 2474 e->qstate = q; 2475 e->qsent = outnet_serviced_query(worker->back, qinfo, flags, dnssec, 2476 want_dnssec, nocaps, check_ratelimit, tcp_upstream, 2477 ssl_upstream, tls_auth_name, addr, addrlen, zone, zonelen, q, 2478 worker_handle_service_reply, e, worker->back->udp_buff, q->env, 2479 was_ratelimited); 2480 if(!e->qsent) { 2481 return NULL; 2482 } 2483 return e; 2484 } 2485 2486 void 2487 worker_alloc_cleanup(void* arg) 2488 { 2489 struct worker* worker = (struct worker*)arg; 2490 slabhash_clear(&worker->env.rrset_cache->table); 2491 slabhash_clear(worker->env.msg_cache); 2492 } 2493 2494 void worker_stats_clear(struct worker* worker) 2495 { 2496 server_stats_init(&worker->stats, worker->env.cfg); 2497 mesh_stats_clear(worker->env.mesh); 2498 worker->back->unwanted_replies = 0; 2499 worker->back->num_tcp_outgoing = 0; 2500 worker->back->num_udp_outgoing = 0; 2501 } 2502 2503 void worker_start_accept(void* arg) 2504 { 2505 struct worker* worker = (struct worker*)arg; 2506 listen_start_accept(worker->front); 2507 if(worker->thread_num == 0) 2508 daemon_remote_start_accept(worker->daemon->rc); 2509 } 2510 2511 void worker_stop_accept(void* arg) 2512 { 2513 struct worker* worker = (struct worker*)arg; 2514 listen_stop_accept(worker->front); 2515 if(worker->thread_num == 0) 2516 daemon_remote_stop_accept(worker->daemon->rc); 2517 } 2518 2519 /* --- fake callbacks for fptr_wlist to work --- */ 2520 struct outbound_entry* libworker_send_query( 2521 struct query_info* ATTR_UNUSED(qinfo), 2522 uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec), 2523 int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps), 2524 int ATTR_UNUSED(check_ratelimit), 2525 struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen), 2526 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream), 2527 int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name), 2528 struct module_qstate* ATTR_UNUSED(q), int* ATTR_UNUSED(was_ratelimited)) 2529 { 2530 log_assert(0); 2531 return 0; 2532 } 2533 2534 int libworker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 2535 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 2536 struct comm_reply* ATTR_UNUSED(reply_info)) 2537 { 2538 log_assert(0); 2539 return 0; 2540 } 2541 2542 void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 2543 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 2544 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 2545 { 2546 log_assert(0); 2547 } 2548 2549 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 2550 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s), 2551 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited)) 2552 { 2553 log_assert(0); 2554 } 2555 2556 void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 2557 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s), 2558 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited)) 2559 { 2560 log_assert(0); 2561 } 2562 2563 void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 2564 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s), 2565 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited)) 2566 { 2567 log_assert(0); 2568 } 2569 2570 int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 2571 { 2572 log_assert(0); 2573 return 0; 2574 } 2575 2576 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 2577 { 2578 log_assert(0); 2579 return 0; 2580 } 2581 2582 int codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 2583 { 2584 log_assert(0); 2585 return 0; 2586 } 2587 2588 #ifdef USE_DNSTAP 2589 void dtio_tap_callback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2590 void* ATTR_UNUSED(arg)) 2591 { 2592 log_assert(0); 2593 } 2594 #endif 2595 2596 #ifdef USE_DNSTAP 2597 void dtio_mainfdcallback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2598 void* ATTR_UNUSED(arg)) 2599 { 2600 log_assert(0); 2601 } 2602 #endif 2603 2604 #ifdef HAVE_NGTCP2 2605 void doq_client_event_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2606 void* ATTR_UNUSED(arg)) 2607 { 2608 log_assert(0); 2609 } 2610 #endif 2611 2612 #ifdef HAVE_NGTCP2 2613 void doq_client_timer_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2614 void* ATTR_UNUSED(arg)) 2615 { 2616 log_assert(0); 2617 } 2618 #endif 2619