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 regional_free_all(worker->scratchpad); 1711 comm_point_drop_reply(repinfo); 1712 return 0; 1713 } 1714 } 1715 1716 /* "if, else if" sequence below deals with downstream DNS Cookies */ 1717 if(acl != acl_allow_cookie) 1718 ; /* pass; No cookie downstream processing whatsoever */ 1719 1720 else if(edns.cookie_valid) 1721 ; /* pass; Valid cookie is good! */ 1722 1723 else if(c->type != comm_udp) 1724 ; /* pass; Stateful transport */ 1725 1726 else if(edns.cookie_present) { 1727 /* Cookie present, but not valid: Cookie was bad! */ 1728 extended_error_encode(c->buffer, 1729 LDNS_EXT_RCODE_BADCOOKIE, &qinfo, 1730 *(uint16_t*)(void *) 1731 sldns_buffer_begin(c->buffer), 1732 sldns_buffer_read_u16_at(c->buffer, 2), 1733 0, &edns); 1734 regional_free_all(worker->scratchpad); 1735 goto send_reply; 1736 } else { 1737 /* Cookie required, but no cookie present on UDP */ 1738 verbose(VERB_ALGO, "worker request: " 1739 "need cookie or stateful transport"); 1740 log_addr(VERB_ALGO, "from",&repinfo->remote_addr 1741 , repinfo->remote_addrlen); 1742 EDNS_OPT_LIST_APPEND_EDE(&edns.opt_list_out, 1743 worker->scratchpad, LDNS_EDE_OTHER, 1744 "DNS Cookie needed for UDP replies"); 1745 error_encode(c->buffer, 1746 (LDNS_RCODE_REFUSED|BIT_TC), &qinfo, 1747 *(uint16_t*)(void *) 1748 sldns_buffer_begin(c->buffer), 1749 sldns_buffer_read_u16_at(c->buffer, 2), 1750 &edns); 1751 regional_free_all(worker->scratchpad); 1752 goto send_reply; 1753 } 1754 1755 if(edns.udp_size > worker->daemon->cfg->max_udp_size && 1756 c->type == comm_udp) { 1757 verbose(VERB_QUERY, 1758 "worker request: max UDP reply size modified" 1759 " (%d to max-udp-size)", (int)edns.udp_size); 1760 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1761 repinfo->client_addrlen); 1762 edns.udp_size = worker->daemon->cfg->max_udp_size; 1763 } 1764 if(edns.udp_size < LDNS_HEADER_SIZE) { 1765 verbose(VERB_ALGO, "worker request: edns is too small."); 1766 log_addr(VERB_CLIENT, "from", &repinfo->client_addr, 1767 repinfo->client_addrlen); 1768 LDNS_QR_SET(sldns_buffer_begin(c->buffer)); 1769 LDNS_TC_SET(sldns_buffer_begin(c->buffer)); 1770 LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), 1771 LDNS_RCODE_SERVFAIL); 1772 sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE); 1773 sldns_buffer_write_at(c->buffer, 4, 1774 (uint8_t*)"\0\0\0\0\0\0\0\0", 8); 1775 sldns_buffer_flip(c->buffer); 1776 regional_free_all(worker->scratchpad); 1777 goto send_reply; 1778 } 1779 if(worker->stats.extended) 1780 server_stats_insquery(&worker->stats, c, qinfo.qtype, 1781 qinfo.qclass, &edns, repinfo); 1782 if(c->type != comm_udp) 1783 edns.udp_size = 65535; /* max size for TCP replies */ 1784 if(qinfo.qclass == LDNS_RR_CLASS_CH && answer_chaos(worker, &qinfo, 1785 &edns, repinfo, c->buffer)) { 1786 regional_free_all(worker->scratchpad); 1787 goto send_reply; 1788 } 1789 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) == 1790 LDNS_PACKET_NOTIFY) { 1791 answer_notify(worker, &qinfo, &edns, c->buffer, 1792 &repinfo->client_addr, repinfo->client_addrlen); 1793 regional_free_all(worker->scratchpad); 1794 goto send_reply; 1795 } 1796 if(local_zones_answer(worker->daemon->local_zones, &worker->env, &qinfo, 1797 &edns, c->buffer, worker->scratchpad, repinfo, acladdr->taglist, 1798 acladdr->taglen, acladdr->tag_actions, 1799 acladdr->tag_actions_size, acladdr->tag_datas, 1800 acladdr->tag_datas_size, worker->daemon->cfg->tagname, 1801 worker->daemon->cfg->num_tags, acladdr->view)) { 1802 regional_free_all(worker->scratchpad); 1803 if(sldns_buffer_limit(c->buffer) == 0) { 1804 comm_point_drop_reply(repinfo); 1805 return 0; 1806 } 1807 goto send_reply; 1808 } 1809 if(worker->env.auth_zones && 1810 rpz_callback_from_worker_request(worker->env.auth_zones, 1811 &worker->env, &qinfo, &edns, c->buffer, worker->scratchpad, 1812 repinfo, acladdr->taglist, acladdr->taglen, &worker->stats, 1813 &rpz_passthru)) { 1814 regional_free_all(worker->scratchpad); 1815 if(sldns_buffer_limit(c->buffer) == 0) { 1816 comm_point_drop_reply(repinfo); 1817 return 0; 1818 } 1819 goto send_reply; 1820 } 1821 if(worker->env.auth_zones && 1822 auth_zones_downstream_answer(worker->env.auth_zones, 1823 &worker->env, &qinfo, &edns, repinfo, c->buffer, 1824 worker->scratchpad)) { 1825 regional_free_all(worker->scratchpad); 1826 if(sldns_buffer_limit(c->buffer) == 0) { 1827 comm_point_drop_reply(repinfo); 1828 return 0; 1829 } 1830 /* set RA for everyone that can have recursion (based on 1831 * access control list) */ 1832 if(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer)) && 1833 acl != acl_deny_non_local && acl != acl_refuse_non_local) 1834 LDNS_RA_SET(sldns_buffer_begin(c->buffer)); 1835 goto send_reply; 1836 } 1837 1838 /* We've looked in our local zones. If the answer isn't there, we 1839 * might need to bail out based on ACLs now. */ 1840 if((ret=deny_refuse_non_local(c, acl, worker, repinfo, acladdr, 1841 worker->env.cfg->ede, &check_result)) != -1) 1842 { 1843 regional_free_all(worker->scratchpad); 1844 if(ret == 1) 1845 goto send_reply; 1846 return ret; 1847 } 1848 1849 /* If this request does not have the recursion bit set, verify 1850 * ACLs allow the recursion bit to be treated as set. */ 1851 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) && 1852 acl == acl_allow_setrd ) { 1853 LDNS_RD_SET(sldns_buffer_begin(c->buffer)); 1854 } 1855 1856 /* If this request does not have the recursion bit set, verify 1857 * ACLs allow the snooping. */ 1858 if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) && 1859 acl != acl_allow_snoop ) { 1860 if(worker->env.cfg->ede) { 1861 EDNS_OPT_LIST_APPEND_EDE(&edns.opt_list_out, 1862 worker->scratchpad, LDNS_EDE_NOT_AUTHORITATIVE, ""); 1863 } 1864 error_encode(c->buffer, LDNS_RCODE_REFUSED, &qinfo, 1865 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1866 sldns_buffer_read_u16_at(c->buffer, 2), &edns); 1867 regional_free_all(worker->scratchpad); 1868 log_addr(VERB_ALGO, "refused nonrec (cache snoop) query from", 1869 &repinfo->client_addr, repinfo->client_addrlen); 1870 1871 goto send_reply; 1872 } 1873 1874 /* If we've found a local alias, replace the qname with the alias 1875 * target before resolving it. */ 1876 if(qinfo.local_alias) { 1877 if(!local_alias_shallow_copy_qname(qinfo.local_alias, &qinfo.qname, 1878 &qinfo.qname_len)) { 1879 regional_free_all(worker->scratchpad); 1880 return 0; /* drop it */ 1881 } 1882 } 1883 1884 /* If we may apply IP-based actions to the answer, build the client 1885 * information. As this can be expensive, skip it if there is 1886 * absolutely no possibility of it. */ 1887 if((worker->daemon->use_response_ip || worker->daemon->use_rpz) && 1888 (qinfo.qtype == LDNS_RR_TYPE_A || 1889 qinfo.qtype == LDNS_RR_TYPE_AAAA || 1890 qinfo.qtype == LDNS_RR_TYPE_ANY)) { 1891 cinfo_tmp.taglist = acladdr->taglist; 1892 cinfo_tmp.taglen = acladdr->taglen; 1893 cinfo_tmp.tag_actions = acladdr->tag_actions; 1894 cinfo_tmp.tag_actions_size = acladdr->tag_actions_size; 1895 cinfo_tmp.tag_datas = acladdr->tag_datas; 1896 cinfo_tmp.tag_datas_size = acladdr->tag_datas_size; 1897 cinfo_tmp.view = acladdr->view; 1898 cinfo_tmp.view_name = NULL; 1899 cinfo = &cinfo_tmp; 1900 } 1901 1902 /* Keep the original edns list around. The pointer could change if there is 1903 * a cached answer (through the inplace callback function there). 1904 * No need to actually copy the contents as they shouldn't change. 1905 * Used while prefetching and subnet is enabled. */ 1906 original_edns_list = edns.opt_list_in; 1907 lookup_cache: 1908 /* Lookup the cache. In case we chase an intermediate CNAME chain 1909 * this is a two-pass operation, and lookup_qinfo is different for 1910 * each pass. We should still pass the original qinfo to 1911 * answer_from_cache(), however, since it's used to build the reply. */ 1912 if(!edns_bypass_cache_stage(edns.opt_list_in, &worker->env)) { 1913 is_expired_answer = 0; 1914 is_secure_answer = 0; 1915 h = query_info_hash(lookup_qinfo, sldns_buffer_read_u16_at(c->buffer, 2)); 1916 if((e=slabhash_lookup(worker->env.msg_cache, h, lookup_qinfo, 0))) { 1917 struct reply_info* rep = (struct reply_info*)e->data; 1918 /* answer from cache - we have acquired a readlock on it */ 1919 if(answer_from_cache(worker, &qinfo, cinfo, &need_drop, 1920 &is_expired_answer, &is_secure_answer, 1921 &alias_rrset, &partial_rep, rep, 1922 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1923 sldns_buffer_read_u16_at(c->buffer, 2), repinfo, 1924 &edns)) { 1925 /* prefetch it if the prefetch TTL expired. 1926 * Note that if there is more than one pass 1927 * its qname must be that used for cache 1928 * lookup. */ 1929 if((worker->env.cfg->prefetch && 1930 rep->prefetch_ttl <= *worker->env.now) || 1931 (worker->env.cfg->serve_expired && 1932 rep->ttl < *worker->env.now && 1933 !(*worker->env.now < rep->serve_expired_norec_ttl))) { 1934 time_t leeway = rep->ttl - *worker->env.now; 1935 if(rep->ttl < *worker->env.now) 1936 leeway = 0; 1937 lock_rw_unlock(&e->lock); 1938 1939 reply_and_prefetch(worker, lookup_qinfo, 1940 sldns_buffer_read_u16_at(c->buffer, 2), 1941 repinfo, leeway, 1942 (partial_rep || need_drop), 1943 rpz_passthru, 1944 original_edns_list); 1945 if(!partial_rep) { 1946 rc = 0; 1947 regional_free_all(worker->scratchpad); 1948 goto send_reply_rc; 1949 } 1950 } else if(!partial_rep) { 1951 lock_rw_unlock(&e->lock); 1952 regional_free_all(worker->scratchpad); 1953 goto send_reply; 1954 } else { 1955 /* Note that we've already released the 1956 * lock if we're here after prefetch. */ 1957 lock_rw_unlock(&e->lock); 1958 } 1959 /* We've found a partial reply ending with an 1960 * alias. Replace the lookup qinfo for the 1961 * alias target and lookup the cache again to 1962 * (possibly) complete the reply. As we're 1963 * passing the "base" reply, there will be no 1964 * more alias chasing. */ 1965 memset(&qinfo_tmp, 0, sizeof(qinfo_tmp)); 1966 get_cname_target(alias_rrset, &qinfo_tmp.qname, 1967 &qinfo_tmp.qname_len); 1968 if(!qinfo_tmp.qname) { 1969 log_err("unexpected: invalid answer alias"); 1970 regional_free_all(worker->scratchpad); 1971 return 0; /* drop query */ 1972 } 1973 qinfo_tmp.qtype = qinfo.qtype; 1974 qinfo_tmp.qclass = qinfo.qclass; 1975 lookup_qinfo = &qinfo_tmp; 1976 goto lookup_cache; 1977 } 1978 verbose(VERB_ALGO, "answer from the cache failed"); 1979 lock_rw_unlock(&e->lock); 1980 } 1981 1982 if(!LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) { 1983 if(answer_norec_from_cache(worker, &qinfo, 1984 *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 1985 sldns_buffer_read_u16_at(c->buffer, 2), repinfo, 1986 &edns)) { 1987 regional_free_all(worker->scratchpad); 1988 goto send_reply; 1989 } 1990 verbose(VERB_ALGO, "answer norec from cache -- " 1991 "need to validate or not primed"); 1992 } 1993 } 1994 sldns_buffer_rewind(c->buffer); 1995 server_stats_querymiss(&worker->stats, worker); 1996 1997 if(verbosity >= VERB_CLIENT) { 1998 if(c->type == comm_udp) 1999 log_addr(VERB_CLIENT, "udp request from", 2000 &repinfo->client_addr, repinfo->client_addrlen); 2001 else log_addr(VERB_CLIENT, "tcp request from", 2002 &repinfo->client_addr, repinfo->client_addrlen); 2003 } 2004 2005 /* grab a work request structure for this new request */ 2006 mesh_new_client(worker->env.mesh, &qinfo, cinfo, 2007 sldns_buffer_read_u16_at(c->buffer, 2), 2008 &edns, repinfo, *(uint16_t*)(void *)sldns_buffer_begin(c->buffer), 2009 rpz_passthru); 2010 regional_free_all(worker->scratchpad); 2011 worker_mem_report(worker, NULL); 2012 return 0; 2013 2014 send_reply: 2015 rc = 1; 2016 send_reply_rc: 2017 if(need_drop) { 2018 comm_point_drop_reply(repinfo); 2019 return 0; 2020 } 2021 if(is_expired_answer) { 2022 worker->stats.ans_expired++; 2023 } 2024 server_stats_insrcode(&worker->stats, c->buffer); 2025 if(worker->stats.extended) { 2026 if(is_secure_answer) worker->stats.ans_secure++; 2027 } 2028 #ifdef USE_DNSTAP 2029 /* 2030 * sending src (client)/dst (local service) addresses over DNSTAP from send_reply code label (when we serviced local zone for ex.) 2031 */ 2032 if(worker->dtenv.log_client_response_messages && rc !=0) { 2033 log_addr(VERB_ALGO, "from local addr", (void*)repinfo->c->socket->addr, repinfo->c->socket->addrlen); 2034 log_addr(VERB_ALGO, "response to client", &repinfo->client_addr, repinfo->client_addrlen); 2035 dt_msg_send_client_response(&worker->dtenv, &repinfo->client_addr, (void*)repinfo->c->socket->addr, c->type, c->ssl, c->buffer); 2036 } 2037 #endif 2038 if(worker->env.cfg->log_replies) 2039 { 2040 struct timeval tv; 2041 memset(&tv, 0, sizeof(tv)); 2042 if(qinfo.local_alias && qinfo.local_alias->rrset && 2043 qinfo.local_alias->rrset->rk.dname) { 2044 /* log original qname, before the local alias was 2045 * used to resolve that CNAME to something else */ 2046 qinfo.qname = qinfo.local_alias->rrset->rk.dname; 2047 log_reply_info(NO_VERBOSE, &qinfo, 2048 &repinfo->client_addr, repinfo->client_addrlen, 2049 tv, 1, c->buffer, 2050 (worker->env.cfg->log_destaddr?(void*)repinfo->c->socket->addr:NULL), 2051 c->type, c->ssl); 2052 } else { 2053 log_reply_info(NO_VERBOSE, &qinfo, 2054 &repinfo->client_addr, repinfo->client_addrlen, 2055 tv, 1, c->buffer, 2056 (worker->env.cfg->log_destaddr?(void*)repinfo->c->socket->addr:NULL), 2057 c->type, c->ssl); 2058 } 2059 } 2060 #ifdef USE_DNSCRYPT 2061 if(!dnsc_handle_uncurved_request(repinfo)) { 2062 return 0; 2063 } 2064 #endif 2065 return rc; 2066 } 2067 2068 void 2069 worker_sighandler(int sig, void* arg) 2070 { 2071 /* note that log, print, syscalls here give race conditions. 2072 * And cause hangups if the log-lock is held by the application. */ 2073 struct worker* worker = (struct worker*)arg; 2074 switch(sig) { 2075 #ifdef SIGHUP 2076 case SIGHUP: 2077 comm_base_exit(worker->base); 2078 break; 2079 #endif 2080 #ifdef SIGBREAK 2081 case SIGBREAK: 2082 #endif 2083 case SIGINT: 2084 worker->need_to_exit = 1; 2085 comm_base_exit(worker->base); 2086 break; 2087 #ifdef SIGQUIT 2088 case SIGQUIT: 2089 worker->need_to_exit = 1; 2090 comm_base_exit(worker->base); 2091 break; 2092 #endif 2093 case SIGTERM: 2094 worker->need_to_exit = 1; 2095 comm_base_exit(worker->base); 2096 break; 2097 default: 2098 /* unknown signal, ignored */ 2099 break; 2100 } 2101 } 2102 2103 /** restart statistics timer for worker, if enabled */ 2104 static void 2105 worker_restart_timer(struct worker* worker) 2106 { 2107 if(worker->env.cfg->stat_interval > 0) { 2108 struct timeval tv; 2109 #ifndef S_SPLINT_S 2110 tv.tv_sec = worker->env.cfg->stat_interval; 2111 tv.tv_usec = 0; 2112 #endif 2113 comm_timer_set(worker->stat_timer, &tv); 2114 } 2115 } 2116 2117 void worker_stat_timer_cb(void* arg) 2118 { 2119 struct worker* worker = (struct worker*)arg; 2120 server_stats_log(&worker->stats, worker, worker->thread_num); 2121 mesh_stats(worker->env.mesh, "mesh has"); 2122 worker_mem_report(worker, NULL); 2123 /* SHM is enabled, process data to SHM */ 2124 if (worker->daemon->cfg->shm_enable) { 2125 shm_main_run(worker); 2126 } 2127 if(!worker->daemon->cfg->stat_cumulative) { 2128 worker_stats_clear(worker); 2129 } 2130 /* start next timer */ 2131 worker_restart_timer(worker); 2132 } 2133 2134 void worker_probe_timer_cb(void* arg) 2135 { 2136 struct worker* worker = (struct worker*)arg; 2137 struct timeval tv; 2138 #ifndef S_SPLINT_S 2139 tv.tv_sec = (time_t)autr_probe_timer(&worker->env); 2140 tv.tv_usec = 0; 2141 #endif 2142 if(tv.tv_sec != 0) 2143 comm_timer_set(worker->env.probe_timer, &tv); 2144 } 2145 2146 struct worker* 2147 worker_create(struct daemon* daemon, int id, int* ports, int n) 2148 { 2149 unsigned int seed; 2150 struct worker* worker = (struct worker*)calloc(1, 2151 sizeof(struct worker)); 2152 if(!worker) 2153 return NULL; 2154 worker->numports = n; 2155 worker->ports = (int*)memdup(ports, sizeof(int)*n); 2156 if(!worker->ports) { 2157 free(worker); 2158 return NULL; 2159 } 2160 worker->daemon = daemon; 2161 worker->thread_num = id; 2162 if(!(worker->cmd = tube_create())) { 2163 free(worker->ports); 2164 free(worker); 2165 return NULL; 2166 } 2167 /* create random state here to avoid locking trouble in RAND_bytes */ 2168 if(!(worker->rndstate = ub_initstate(daemon->rand))) { 2169 log_err("could not init random numbers."); 2170 tube_delete(worker->cmd); 2171 free(worker->ports); 2172 free(worker); 2173 return NULL; 2174 } 2175 explicit_bzero(&seed, sizeof(seed)); 2176 return worker; 2177 } 2178 2179 int 2180 worker_init(struct worker* worker, struct config_file *cfg, 2181 struct listen_port* ports, int do_sigs) 2182 { 2183 #ifdef USE_DNSTAP 2184 struct dt_env* dtenv = &worker->dtenv; 2185 #else 2186 void* dtenv = NULL; 2187 #endif 2188 #ifdef HAVE_GETTID 2189 worker->thread_tid = gettid(); 2190 #endif 2191 worker->need_to_exit = 0; 2192 worker->base = comm_base_create(do_sigs); 2193 if(!worker->base) { 2194 log_err("could not create event handling base"); 2195 worker_delete(worker); 2196 return 0; 2197 } 2198 comm_base_set_slow_accept_handlers(worker->base, &worker_stop_accept, 2199 &worker_start_accept, worker); 2200 if(do_sigs) { 2201 #ifdef SIGHUP 2202 ub_thread_sig_unblock(SIGHUP); 2203 #endif 2204 #ifdef SIGBREAK 2205 ub_thread_sig_unblock(SIGBREAK); 2206 #endif 2207 ub_thread_sig_unblock(SIGINT); 2208 #ifdef SIGQUIT 2209 ub_thread_sig_unblock(SIGQUIT); 2210 #endif 2211 ub_thread_sig_unblock(SIGTERM); 2212 #ifndef LIBEVENT_SIGNAL_PROBLEM 2213 worker->comsig = comm_signal_create(worker->base, 2214 worker_sighandler, worker); 2215 if(!worker->comsig 2216 #ifdef SIGHUP 2217 || !comm_signal_bind(worker->comsig, SIGHUP) 2218 #endif 2219 #ifdef SIGQUIT 2220 || !comm_signal_bind(worker->comsig, SIGQUIT) 2221 #endif 2222 || !comm_signal_bind(worker->comsig, SIGTERM) 2223 #ifdef SIGBREAK 2224 || !comm_signal_bind(worker->comsig, SIGBREAK) 2225 #endif 2226 || !comm_signal_bind(worker->comsig, SIGINT)) { 2227 log_err("could not create signal handlers"); 2228 worker_delete(worker); 2229 return 0; 2230 } 2231 #endif /* LIBEVENT_SIGNAL_PROBLEM */ 2232 if(!daemon_remote_open_accept(worker->daemon->rc, 2233 worker->daemon->rc_ports, worker)) { 2234 worker_delete(worker); 2235 return 0; 2236 } 2237 #ifdef UB_ON_WINDOWS 2238 wsvc_setup_worker(worker); 2239 #endif /* UB_ON_WINDOWS */ 2240 } else { /* !do_sigs */ 2241 worker->comsig = NULL; 2242 } 2243 #ifdef USE_DNSTAP 2244 if(cfg->dnstap) { 2245 log_assert(worker->daemon->dtenv != NULL); 2246 memcpy(&worker->dtenv, worker->daemon->dtenv, sizeof(struct dt_env)); 2247 if(!dt_init(&worker->dtenv, worker->base)) 2248 fatal_exit("dt_init failed"); 2249 } 2250 #endif 2251 worker->front = listen_create(worker->base, ports, 2252 cfg->msg_buffer_size, (int)cfg->incoming_num_tcp, 2253 cfg->do_tcp_keepalive 2254 ? cfg->tcp_keepalive_timeout 2255 : cfg->tcp_idle_timeout, 2256 cfg->harden_large_queries, cfg->http_max_streams, 2257 cfg->http_endpoint, cfg->http_notls_downstream, 2258 worker->daemon->tcl, worker->daemon->listen_dot_sslctx, 2259 worker->daemon->listen_doh_sslctx, 2260 worker->daemon->listen_quic_sslctx, 2261 dtenv, worker->daemon->doq_table, worker->env.rnd, 2262 cfg, worker_handle_request, worker); 2263 if(!worker->front) { 2264 log_err("could not create listening sockets"); 2265 worker_delete(worker); 2266 return 0; 2267 } 2268 worker->back = outside_network_create(worker->base, 2269 cfg->msg_buffer_size, (size_t)cfg->outgoing_num_ports, 2270 cfg->out_ifs, cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6, 2271 cfg->do_tcp?cfg->outgoing_num_tcp:0, cfg->ip_dscp, 2272 worker->daemon->env->infra_cache, worker->rndstate, 2273 cfg->use_caps_bits_for_id, worker->ports, worker->numports, 2274 cfg->unwanted_threshold, cfg->outgoing_tcp_mss, 2275 &worker_alloc_cleanup, worker, 2276 cfg->do_udp || cfg->udp_upstream_without_downstream, 2277 worker->daemon->connect_dot_sslctx, cfg->delay_close, 2278 cfg->tls_use_sni, dtenv, cfg->udp_connect, 2279 cfg->max_reuse_tcp_queries, cfg->tcp_reuse_timeout, 2280 cfg->tcp_auth_query_timeout); 2281 if(!worker->back) { 2282 log_err("could not create outgoing sockets"); 2283 worker_delete(worker); 2284 return 0; 2285 } 2286 iterator_set_ip46_support(&worker->daemon->mods, worker->daemon->env, 2287 worker->back); 2288 /* start listening to commands */ 2289 if(!tube_setup_bg_listen(worker->cmd, worker->base, 2290 &worker_handle_control_cmd, worker)) { 2291 log_err("could not create control compt."); 2292 worker_delete(worker); 2293 return 0; 2294 } 2295 worker->stat_timer = comm_timer_create(worker->base, 2296 worker_stat_timer_cb, worker); 2297 if(!worker->stat_timer) { 2298 log_err("could not create statistics timer"); 2299 } 2300 2301 /* we use the msg_buffer_size as a good estimate for what the 2302 * user wants for memory usage sizes */ 2303 worker->scratchpad = regional_create_custom(cfg->msg_buffer_size); 2304 if(!worker->scratchpad) { 2305 log_err("malloc failure"); 2306 worker_delete(worker); 2307 return 0; 2308 } 2309 2310 server_stats_init(&worker->stats, cfg); 2311 worker->alloc = worker->daemon->worker_allocs[worker->thread_num]; 2312 alloc_set_id_cleanup(worker->alloc, &worker_alloc_cleanup, worker); 2313 worker->env = *worker->daemon->env; 2314 comm_base_timept(worker->base, &worker->env.now, &worker->env.now_tv); 2315 worker->env.worker = worker; 2316 worker->env.worker_base = worker->base; 2317 worker->env.send_query = &worker_send_query; 2318 worker->env.alloc = worker->alloc; 2319 worker->env.outnet = worker->back; 2320 worker->env.rnd = worker->rndstate; 2321 /* If case prefetch is triggered, the corresponding mesh will clear 2322 * the scratchpad for the module env in the middle of request handling. 2323 * It would be prone to a use-after-free kind of bug, so we avoid 2324 * sharing it with worker's own scratchpad at the cost of having 2325 * one more pad per worker. */ 2326 worker->env.scratch = regional_create_custom(cfg->msg_buffer_size); 2327 if(!worker->env.scratch) { 2328 log_err("malloc failure"); 2329 worker_delete(worker); 2330 return 0; 2331 } 2332 worker->env.mesh = mesh_create(&worker->daemon->mods, &worker->env); 2333 if(!worker->env.mesh) { 2334 log_err("malloc failure"); 2335 worker_delete(worker); 2336 return 0; 2337 } 2338 /* Pass on daemon variables that we would need in the mesh area */ 2339 worker->env.mesh->use_response_ip = worker->daemon->use_response_ip; 2340 worker->env.mesh->use_rpz = worker->daemon->use_rpz; 2341 2342 worker->env.detach_subs = &mesh_detach_subs; 2343 worker->env.attach_sub = &mesh_attach_sub; 2344 worker->env.add_sub = &mesh_add_sub; 2345 worker->env.kill_sub = &mesh_state_delete; 2346 worker->env.detect_cycle = &mesh_detect_cycle; 2347 worker->env.scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size); 2348 if(!worker->env.scratch_buffer) { 2349 log_err("malloc failure"); 2350 worker_delete(worker); 2351 return 0; 2352 } 2353 /* one probe timer per process -- if we have 5011 anchors */ 2354 if(autr_get_num_anchors(worker->env.anchors) > 0 2355 #ifndef THREADS_DISABLED 2356 && worker->thread_num == 0 2357 #endif 2358 ) { 2359 struct timeval tv; 2360 tv.tv_sec = 0; 2361 tv.tv_usec = 0; 2362 worker->env.probe_timer = comm_timer_create(worker->base, 2363 worker_probe_timer_cb, worker); 2364 if(!worker->env.probe_timer) { 2365 log_err("could not create 5011-probe timer"); 2366 } else { 2367 /* let timer fire, then it can reset itself */ 2368 comm_timer_set(worker->env.probe_timer, &tv); 2369 } 2370 } 2371 /* zone transfer tasks, setup once per process, if any */ 2372 if(worker->env.auth_zones 2373 #ifndef THREADS_DISABLED 2374 && worker->thread_num == 0 2375 #endif 2376 ) { 2377 auth_xfer_pickup_initial(worker->env.auth_zones, &worker->env); 2378 auth_zones_pickup_zonemd_verify(worker->env.auth_zones, 2379 &worker->env); 2380 } 2381 #ifdef USE_DNSTAP 2382 if(worker->daemon->cfg->dnstap 2383 #ifndef THREADS_DISABLED 2384 && worker->thread_num == 0 2385 #endif 2386 ) { 2387 if(!dt_io_thread_start(dtenv->dtio, comm_base_internal( 2388 worker->base), worker->daemon->num)) { 2389 log_err("could not start dnstap io thread"); 2390 worker_delete(worker); 2391 return 0; 2392 } 2393 } 2394 #endif /* USE_DNSTAP */ 2395 worker_mem_report(worker, NULL); 2396 /* if statistics enabled start timer */ 2397 if(worker->env.cfg->stat_interval > 0) { 2398 verbose(VERB_ALGO, "set statistics interval %d secs", 2399 worker->env.cfg->stat_interval); 2400 worker_restart_timer(worker); 2401 } 2402 pp_init(&sldns_write_uint16, &sldns_write_uint32); 2403 return 1; 2404 } 2405 2406 void 2407 worker_work(struct worker* worker) 2408 { 2409 comm_base_dispatch(worker->base); 2410 } 2411 2412 void 2413 worker_delete(struct worker* worker) 2414 { 2415 if(!worker) 2416 return; 2417 if(worker->env.mesh && verbosity >= VERB_OPS) { 2418 server_stats_log(&worker->stats, worker, worker->thread_num); 2419 mesh_stats(worker->env.mesh, "mesh has"); 2420 worker_mem_report(worker, NULL); 2421 } 2422 outside_network_quit_prepare(worker->back); 2423 mesh_delete(worker->env.mesh); 2424 sldns_buffer_free(worker->env.scratch_buffer); 2425 listen_delete(worker->front); 2426 outside_network_delete(worker->back); 2427 comm_signal_delete(worker->comsig); 2428 tube_delete(worker->cmd); 2429 comm_timer_delete(worker->stat_timer); 2430 comm_timer_delete(worker->env.probe_timer); 2431 free(worker->ports); 2432 if(worker->thread_num == 0) { 2433 #ifdef UB_ON_WINDOWS 2434 wsvc_desetup_worker(worker); 2435 #endif /* UB_ON_WINDOWS */ 2436 } 2437 #ifdef USE_DNSTAP 2438 if(worker->daemon->cfg->dnstap 2439 #ifndef THREADS_DISABLED 2440 && worker->thread_num == 0 2441 #endif 2442 ) { 2443 dt_io_thread_stop(worker->dtenv.dtio); 2444 } 2445 dt_deinit(&worker->dtenv); 2446 #endif /* USE_DNSTAP */ 2447 comm_base_delete(worker->base); 2448 ub_randfree(worker->rndstate); 2449 /* don't touch worker->alloc, as it's maintained in daemon */ 2450 regional_destroy(worker->env.scratch); 2451 regional_destroy(worker->scratchpad); 2452 free(worker); 2453 } 2454 2455 struct outbound_entry* 2456 worker_send_query(struct query_info* qinfo, uint16_t flags, int dnssec, 2457 int want_dnssec, int nocaps, int check_ratelimit, 2458 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone, 2459 size_t zonelen, int tcp_upstream, int ssl_upstream, char* tls_auth_name, 2460 struct module_qstate* q, int* was_ratelimited) 2461 { 2462 struct worker* worker = q->env->worker; 2463 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 2464 q->region, sizeof(*e)); 2465 if(!e) 2466 return NULL; 2467 e->qstate = q; 2468 e->qsent = outnet_serviced_query(worker->back, qinfo, flags, dnssec, 2469 want_dnssec, nocaps, check_ratelimit, tcp_upstream, 2470 ssl_upstream, tls_auth_name, addr, addrlen, zone, zonelen, q, 2471 worker_handle_service_reply, e, worker->back->udp_buff, q->env, 2472 was_ratelimited); 2473 if(!e->qsent) { 2474 return NULL; 2475 } 2476 return e; 2477 } 2478 2479 void 2480 worker_alloc_cleanup(void* arg) 2481 { 2482 struct worker* worker = (struct worker*)arg; 2483 slabhash_clear(&worker->env.rrset_cache->table); 2484 slabhash_clear(worker->env.msg_cache); 2485 } 2486 2487 void worker_stats_clear(struct worker* worker) 2488 { 2489 server_stats_init(&worker->stats, worker->env.cfg); 2490 mesh_stats_clear(worker->env.mesh); 2491 worker->back->unwanted_replies = 0; 2492 worker->back->num_tcp_outgoing = 0; 2493 worker->back->num_udp_outgoing = 0; 2494 } 2495 2496 void worker_start_accept(void* arg) 2497 { 2498 struct worker* worker = (struct worker*)arg; 2499 listen_start_accept(worker->front); 2500 if(worker->thread_num == 0) 2501 daemon_remote_start_accept(worker->daemon->rc); 2502 } 2503 2504 void worker_stop_accept(void* arg) 2505 { 2506 struct worker* worker = (struct worker*)arg; 2507 listen_stop_accept(worker->front); 2508 if(worker->thread_num == 0) 2509 daemon_remote_stop_accept(worker->daemon->rc); 2510 } 2511 2512 /* --- fake callbacks for fptr_wlist to work --- */ 2513 struct outbound_entry* libworker_send_query( 2514 struct query_info* ATTR_UNUSED(qinfo), 2515 uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec), 2516 int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps), 2517 int ATTR_UNUSED(check_ratelimit), 2518 struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen), 2519 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream), 2520 int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name), 2521 struct module_qstate* ATTR_UNUSED(q), int* ATTR_UNUSED(was_ratelimited)) 2522 { 2523 log_assert(0); 2524 return 0; 2525 } 2526 2527 int libworker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 2528 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 2529 struct comm_reply* ATTR_UNUSED(reply_info)) 2530 { 2531 log_assert(0); 2532 return 0; 2533 } 2534 2535 void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 2536 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 2537 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 2538 { 2539 log_assert(0); 2540 } 2541 2542 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 2543 sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s), 2544 char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited)) 2545 { 2546 log_assert(0); 2547 } 2548 2549 void libworker_bg_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_event_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 int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 2564 { 2565 log_assert(0); 2566 return 0; 2567 } 2568 2569 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 2570 { 2571 log_assert(0); 2572 return 0; 2573 } 2574 2575 int codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 2576 { 2577 log_assert(0); 2578 return 0; 2579 } 2580 2581 #ifdef USE_DNSTAP 2582 void dtio_tap_callback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2583 void* ATTR_UNUSED(arg)) 2584 { 2585 log_assert(0); 2586 } 2587 #endif 2588 2589 #ifdef USE_DNSTAP 2590 void dtio_mainfdcallback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2591 void* ATTR_UNUSED(arg)) 2592 { 2593 log_assert(0); 2594 } 2595 #endif 2596 2597 #ifdef HAVE_NGTCP2 2598 void doq_client_event_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2599 void* ATTR_UNUSED(arg)) 2600 { 2601 log_assert(0); 2602 } 2603 #endif 2604 2605 #ifdef HAVE_NGTCP2 2606 void doq_client_timer_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 2607 void* ATTR_UNUSED(arg)) 2608 { 2609 log_assert(0); 2610 } 2611 #endif 2612