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