1/* 2 * libunbound/worker.c - worker thread or process that resolves 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 contains the worker process or thread that performs 40 * the DNS resolving and validation. The worker is called by a procedure 41 * and if in the background continues until exit, if in the foreground 42 * returns from the procedure when done. 43 */ 44#include "config.h" 45#ifdef HAVE_SSL 46#include <openssl/ssl.h> 47#endif 48#include "libunbound/libworker.h" 49#include "libunbound/context.h" 50#include "libunbound/unbound.h" 51#include "libunbound/worker.h" 52#include "libunbound/unbound-event.h" 53#include "services/outside_network.h" 54#include "services/mesh.h" 55#include "services/localzone.h" 56#include "services/cache/rrset.h" 57#include "services/outbound_list.h" 58#include "services/authzone.h" 59#include "util/fptr_wlist.h" 60#include "util/module.h" 61#include "util/regional.h" 62#include "util/random.h" 63#include "util/config_file.h" 64#include "util/netevent.h" 65#include "util/proxy_protocol.h" 66#include "util/storage/lookup3.h" 67#include "util/storage/slabhash.h" 68#include "util/net_help.h" 69#include "util/data/dname.h" 70#include "util/data/msgreply.h" 71#include "util/data/msgencode.h" 72#include "util/tube.h" 73#include "iterator/iter_fwd.h" 74#include "iterator/iter_hints.h" 75#include "sldns/sbuffer.h" 76#include "sldns/str2wire.h" 77#ifdef USE_DNSTAP 78#include "dnstap/dtstream.h" 79#endif 80 81#ifdef HAVE_TARGETCONDITIONALS_H 82#include <TargetConditionals.h> 83#endif 84 85#if (defined(TARGET_OS_TV) && TARGET_OS_TV) || (defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) 86#undef HAVE_FORK 87#endif 88 89/** handle new query command for bg worker */ 90static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len); 91 92/** delete libworker env */ 93static void 94libworker_delete_env(struct libworker* w) 95{ 96 if(w->env) { 97 outside_network_quit_prepare(w->back); 98 mesh_delete(w->env->mesh); 99 context_release_alloc(w->ctx, w->env->alloc, 100 !w->is_bg || w->is_bg_thread); 101 sldns_buffer_free(w->env->scratch_buffer); 102 regional_destroy(w->env->scratch); 103 forwards_delete(w->env->fwds); 104 hints_delete(w->env->hints); 105 ub_randfree(w->env->rnd); 106 free(w->env); 107 } 108#ifdef HAVE_SSL 109 SSL_CTX_free(w->sslctx); 110#endif 111 outside_network_delete(w->back); 112} 113 114/** delete libworker struct */ 115static void 116libworker_delete(struct libworker* w) 117{ 118 if(!w) return; 119 libworker_delete_env(w); 120 comm_base_delete(w->base); 121 free(w); 122} 123 124void 125libworker_delete_event(struct libworker* w) 126{ 127 if(!w) return; 128 libworker_delete_env(w); 129 comm_base_delete_no_base(w->base); 130 free(w); 131} 132 133/** setup fresh libworker struct */ 134static struct libworker* 135libworker_setup(struct ub_ctx* ctx, int is_bg, struct ub_event_base* eb) 136{ 137 struct libworker* w = (struct libworker*)calloc(1, sizeof(*w)); 138 struct config_file* cfg = ctx->env->cfg; 139 int* ports; 140 int numports; 141 if(!w) return NULL; 142 w->is_bg = is_bg; 143 w->ctx = ctx; 144 w->env = (struct module_env*)malloc(sizeof(*w->env)); 145 if(!w->env) { 146 free(w); 147 return NULL; 148 } 149 *w->env = *ctx->env; 150 w->env->alloc = context_obtain_alloc(ctx, !w->is_bg || w->is_bg_thread); 151 if(!w->env->alloc) { 152 libworker_delete(w); 153 return NULL; 154 } 155 w->thread_num = w->env->alloc->thread_num; 156 alloc_set_id_cleanup(w->env->alloc, &libworker_alloc_cleanup, w); 157 if(!w->is_bg || w->is_bg_thread) { 158 lock_basic_lock(&ctx->cfglock); 159 } 160 w->env->scratch = regional_create_custom(cfg->msg_buffer_size); 161 w->env->scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size); 162 w->env->fwds = forwards_create(); 163 if(w->env->fwds && !forwards_apply_cfg(w->env->fwds, cfg)) { 164 forwards_delete(w->env->fwds); 165 w->env->fwds = NULL; 166 } 167 w->env->hints = hints_create(); 168 if(w->env->hints && !hints_apply_cfg(w->env->hints, cfg)) { 169 hints_delete(w->env->hints); 170 w->env->hints = NULL; 171 } 172#ifdef HAVE_SSL 173 w->sslctx = connect_sslctx_create(NULL, NULL, 174 cfg->tls_cert_bundle, cfg->tls_win_cert); 175 if(!w->sslctx) { 176 /* to make the setup fail after unlock */ 177 hints_delete(w->env->hints); 178 w->env->hints = NULL; 179 } 180#endif 181 if(!w->is_bg || w->is_bg_thread) { 182 lock_basic_unlock(&ctx->cfglock); 183 } 184 if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds || 185 !w->env->hints) { 186 libworker_delete(w); 187 return NULL; 188 } 189 w->env->worker = (struct worker*)w; 190 w->env->probe_timer = NULL; 191 if(!w->is_bg || w->is_bg_thread) { 192 lock_basic_lock(&ctx->cfglock); 193 } 194 if(!(w->env->rnd = ub_initstate(ctx->seed_rnd))) { 195 if(!w->is_bg || w->is_bg_thread) { 196 lock_basic_unlock(&ctx->cfglock); 197 } 198 libworker_delete(w); 199 return NULL; 200 } 201 if(!w->is_bg || w->is_bg_thread) { 202 lock_basic_unlock(&ctx->cfglock); 203 } 204 if(1) { 205 /* primitive lockout for threading: if it overwrites another 206 * thread it is like wiping the cache (which is likely empty 207 * at the start) */ 208 /* note we are holding the ctx lock in normal threaded 209 * cases so that is solved properly, it is only for many ctx 210 * in different threads that this may clash */ 211 static int done_raninit = 0; 212 if(!done_raninit) { 213 done_raninit = 1; 214 hash_set_raninit((uint32_t)ub_random(w->env->rnd)); 215 } 216 } 217 218 if(eb) 219 w->base = comm_base_create_event(eb); 220 else w->base = comm_base_create(0); 221 if(!w->base) { 222 libworker_delete(w); 223 return NULL; 224 } 225 w->env->worker_base = w->base; 226 if(!w->is_bg || w->is_bg_thread) { 227 lock_basic_lock(&ctx->cfglock); 228 } 229 numports = cfg_condense_ports(cfg, &ports); 230 if(numports == 0) { 231 if(!w->is_bg || w->is_bg_thread) { 232 lock_basic_unlock(&ctx->cfglock); 233 } 234 libworker_delete(w); 235 return NULL; 236 } 237 w->back = outside_network_create(w->base, cfg->msg_buffer_size, 238 (size_t)cfg->outgoing_num_ports, cfg->out_ifs, 239 cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6, 240 cfg->do_tcp?cfg->outgoing_num_tcp:0, cfg->ip_dscp, 241 w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id, 242 ports, numports, cfg->unwanted_threshold, 243 cfg->outgoing_tcp_mss, &libworker_alloc_cleanup, w, 244 cfg->do_udp || cfg->udp_upstream_without_downstream, w->sslctx, 245 cfg->delay_close, cfg->tls_use_sni, NULL, cfg->udp_connect, 246 cfg->max_reuse_tcp_queries, cfg->tcp_reuse_timeout, 247 cfg->tcp_auth_query_timeout); 248 w->env->outnet = w->back; 249 if(!w->is_bg || w->is_bg_thread) { 250 lock_basic_unlock(&ctx->cfglock); 251 } 252 free(ports); 253 if(!w->back) { 254 libworker_delete(w); 255 return NULL; 256 } 257 w->env->mesh = mesh_create(&ctx->mods, w->env); 258 if(!w->env->mesh) { 259 libworker_delete(w); 260 return NULL; 261 } 262 w->env->send_query = &libworker_send_query; 263 w->env->detach_subs = &mesh_detach_subs; 264 w->env->attach_sub = &mesh_attach_sub; 265 w->env->add_sub = &mesh_add_sub; 266 w->env->kill_sub = &mesh_state_delete; 267 w->env->detect_cycle = &mesh_detect_cycle; 268 comm_base_timept(w->base, &w->env->now, &w->env->now_tv); 269 pp_init(&sldns_write_uint16, &sldns_write_uint32); 270 return w; 271} 272 273struct libworker* libworker_create_event(struct ub_ctx* ctx, 274 struct ub_event_base* eb) 275{ 276 return libworker_setup(ctx, 0, eb); 277} 278 279/** handle cancel command for bg worker */ 280static void 281handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len) 282{ 283 struct ctx_query* q; 284 if(w->is_bg_thread) { 285 lock_basic_lock(&w->ctx->cfglock); 286 q = context_deserialize_cancel(w->ctx, buf, len); 287 lock_basic_unlock(&w->ctx->cfglock); 288 } else { 289 q = context_deserialize_cancel(w->ctx, buf, len); 290 } 291 if(!q) { 292 /* probably simply lookup failed, i.e. the message had been 293 * processed and answered before the cancel arrived */ 294 return; 295 } 296 q->cancelled = 1; 297 free(buf); 298} 299 300/** do control command coming into bg server */ 301static void 302libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len) 303{ 304 switch(context_serial_getcmd(msg, len)) { 305 default: 306 case UB_LIBCMD_ANSWER: 307 log_err("unknown command for bg worker %d", 308 (int)context_serial_getcmd(msg, len)); 309 /* and fall through to quit */ 310 /* fallthrough */ 311 case UB_LIBCMD_QUIT: 312 free(msg); 313 comm_base_exit(w->base); 314 break; 315 case UB_LIBCMD_NEWQUERY: 316 handle_newq(w, msg, len); 317 break; 318 case UB_LIBCMD_CANCEL: 319 handle_cancel(w, msg, len); 320 break; 321 } 322} 323 324/** handle control command coming into server */ 325void 326libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 327 uint8_t* msg, size_t len, int err, void* arg) 328{ 329 struct libworker* w = (struct libworker*)arg; 330 331 if(err != 0) { 332 free(msg); 333 /* it is of no use to go on, exit */ 334 comm_base_exit(w->base); 335 return; 336 } 337 libworker_do_cmd(w, msg, len); /* also frees the buf */ 338} 339 340/** the background thread func */ 341static void* 342libworker_dobg(void* arg) 343{ 344 /* setup */ 345 uint32_t m; 346 struct libworker* w = (struct libworker*)arg; 347 struct ub_ctx* ctx; 348 if(!w) { 349 log_err("libunbound bg worker init failed, nomem"); 350 return NULL; 351 } 352 ctx = w->ctx; 353 log_thread_set(&w->thread_num); 354#ifdef THREADS_DISABLED 355 /* we are forked */ 356 w->is_bg_thread = 0; 357 /* close non-used parts of the pipes */ 358 tube_close_write(ctx->qq_pipe); 359 tube_close_read(ctx->rr_pipe); 360#endif 361 if(!tube_setup_bg_listen(ctx->qq_pipe, w->base, 362 libworker_handle_control_cmd, w)) { 363 log_err("libunbound bg worker init failed, no bglisten"); 364 return NULL; 365 } 366 if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) { 367 log_err("libunbound bg worker init failed, no bgwrite"); 368 return NULL; 369 } 370 371 /* do the work */ 372 comm_base_dispatch(w->base); 373 374 /* cleanup */ 375 m = UB_LIBCMD_QUIT; 376 w->want_quit = 1; 377 tube_remove_bg_listen(w->ctx->qq_pipe); 378 tube_remove_bg_write(w->ctx->rr_pipe); 379 libworker_delete(w); 380 (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m, 381 (uint32_t)sizeof(m), 0); 382#ifdef THREADS_DISABLED 383 /* close pipes from forked process before exit */ 384 tube_close_read(ctx->qq_pipe); 385 tube_close_write(ctx->rr_pipe); 386#endif 387 return NULL; 388} 389 390int libworker_bg(struct ub_ctx* ctx) 391{ 392 struct libworker* w; 393 /* fork or threadcreate */ 394 lock_basic_lock(&ctx->cfglock); 395 if(ctx->dothread) { 396 lock_basic_unlock(&ctx->cfglock); 397 w = libworker_setup(ctx, 1, NULL); 398 if(!w) return UB_NOMEM; 399 w->is_bg_thread = 1; 400 ctx->thread_worker = w; 401#ifdef ENABLE_LOCK_CHECKS 402 w->thread_num = 1; /* for nicer DEBUG checklocks */ 403#endif 404 ub_thread_create(&ctx->bg_tid, libworker_dobg, w); 405 } else { 406 lock_basic_unlock(&ctx->cfglock); 407#ifndef HAVE_FORK 408 /* no fork on windows */ 409 return UB_FORKFAIL; 410#else /* HAVE_FORK */ 411 switch((ctx->bg_pid=fork())) { 412 case 0: 413 w = libworker_setup(ctx, 1, NULL); 414 if(!w) fatal_exit("out of memory"); 415 /* close non-used parts of the pipes */ 416 tube_close_write(ctx->qq_pipe); 417 tube_close_read(ctx->rr_pipe); 418 (void)libworker_dobg(w); 419 exit(0); 420 break; 421 case -1: 422 return UB_FORKFAIL; 423 default: 424 /* close non-used parts, so that the worker 425 * bgprocess gets 'pipe closed' when the 426 * main process exits */ 427 tube_close_read(ctx->qq_pipe); 428 tube_close_write(ctx->rr_pipe); 429 break; 430 } 431#endif /* HAVE_FORK */ 432 } 433 return UB_NOERROR; 434} 435 436/** insert canonname */ 437static int 438fill_canon(struct ub_result* res, uint8_t* s) 439{ 440 char buf[255+2]; 441 dname_str(s, buf); 442 res->canonname = strdup(buf); 443 return res->canonname != 0; 444} 445 446/** fill data into result */ 447static int 448fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer, 449 uint8_t* finalcname, struct query_info* rq, struct reply_info* rep) 450{ 451 size_t i; 452 struct packed_rrset_data* data; 453 res->ttl = 0; 454 if(!answer) { 455 if(finalcname) { 456 if(!fill_canon(res, finalcname)) 457 return 0; /* out of memory */ 458 } 459 if(rep->rrset_count != 0) 460 res->ttl = (int)rep->ttl; 461 res->data = (char**)calloc(1, sizeof(char*)); 462 if(!res->data) 463 return 0; /* out of memory */ 464 res->len = (int*)calloc(1, sizeof(int)); 465 if(!res->len) { 466 free(res->data); 467 res->data = NULL; 468 return 0; /* out of memory */ 469 } 470 return 1; 471 } 472 data = (struct packed_rrset_data*)answer->entry.data; 473 if(query_dname_compare(rq->qname, answer->rk.dname) != 0) { 474 if(!fill_canon(res, answer->rk.dname)) 475 return 0; /* out of memory */ 476 } else res->canonname = NULL; 477 res->data = (char**)calloc(data->count+1, sizeof(char*)); 478 if(!res->data) 479 return 0; /* out of memory */ 480 res->len = (int*)calloc(data->count+1, sizeof(int)); 481 if(!res->len) { 482 free(res->data); 483 res->data = NULL; 484 return 0; /* out of memory */ 485 } 486 for(i=0; i<data->count; i++) { 487 /* remove rdlength from rdata */ 488 res->len[i] = (int)(data->rr_len[i] - 2); 489 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]); 490 if(!res->data[i]) { 491 size_t j; 492 for(j=0; j<i; j++) { 493 free(res->data[j]); 494 res->data[j] = NULL; 495 } 496 free(res->data); 497 res->data = NULL; 498 free(res->len); 499 res->len = NULL; 500 return 0; /* out of memory */ 501 } 502 } 503 /* ttl for positive answers, from CNAME and answer RRs */ 504 if(data->count != 0) { 505 size_t j; 506 res->ttl = (int)data->ttl; 507 for(j=0; j<rep->an_numrrsets; j++) { 508 struct packed_rrset_data* d = 509 (struct packed_rrset_data*)rep->rrsets[j]-> 510 entry.data; 511 if((int)d->ttl < res->ttl) 512 res->ttl = (int)d->ttl; 513 } 514 } 515 /* ttl for negative answers */ 516 if(data->count == 0 && rep->rrset_count != 0) 517 res->ttl = (int)rep->ttl; 518 res->data[data->count] = NULL; 519 res->len[data->count] = 0; 520 return 1; 521} 522 523/** fill result from parsed message, on error fills servfail */ 524void 525libworker_enter_result(struct ub_result* res, sldns_buffer* buf, 526 struct regional* temp, enum sec_status msg_security) 527{ 528 struct query_info rq; 529 struct reply_info* rep; 530 res->rcode = LDNS_RCODE_SERVFAIL; 531 rep = parse_reply_in_temp_region(buf, temp, &rq); 532 if(!rep) { 533 log_err("cannot parse buf"); 534 return; /* error parsing buf, or out of memory */ 535 } 536 if(!fill_res(res, reply_find_answer_rrset(&rq, rep), 537 reply_find_final_cname_target(&rq, rep), &rq, rep)) 538 return; /* out of memory */ 539 /* rcode, havedata, nxdomain, secure, bogus */ 540 res->rcode = (int)FLAGS_GET_RCODE(rep->flags); 541 if(res->data && res->data[0]) 542 res->havedata = 1; 543 if(res->rcode == LDNS_RCODE_NXDOMAIN) 544 res->nxdomain = 1; 545 if(msg_security == sec_status_secure) 546 res->secure = 1; 547 if(msg_security == sec_status_bogus || 548 msg_security == sec_status_secure_sentinel_fail) 549 res->bogus = 1; 550} 551 552/** fillup fg results */ 553static void 554libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf, 555 enum sec_status s, char* why_bogus, int was_ratelimited) 556{ 557 q->res->was_ratelimited = was_ratelimited; 558 if(why_bogus) 559 q->res->why_bogus = strdup(why_bogus); 560 if(rcode != 0) { 561 q->res->rcode = rcode; 562 q->msg_security = s; 563 return; 564 } 565 566 q->res->rcode = LDNS_RCODE_SERVFAIL; 567 q->msg_security = sec_status_unchecked; 568 q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf)); 569 q->msg_len = sldns_buffer_limit(buf); 570 if(!q->msg) { 571 return; /* the error is in the rcode */ 572 } 573 574 /* canonname and results */ 575 q->msg_security = s; 576 libworker_enter_result(q->res, buf, q->w->env->scratch, s); 577} 578 579void 580libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s, 581 char* why_bogus, int was_ratelimited) 582{ 583 struct ctx_query* q = (struct ctx_query*)arg; 584 /* fg query is done; exit comm base */ 585 comm_base_exit(q->w->base); 586 587 libworker_fillup_fg(q, rcode, buf, s, why_bogus, was_ratelimited); 588} 589 590/** setup qinfo and edns */ 591static int 592setup_qinfo_edns(struct libworker* w, struct ctx_query* q, 593 struct query_info* qinfo, struct edns_data* edns) 594{ 595 qinfo->qtype = (uint16_t)q->res->qtype; 596 qinfo->qclass = (uint16_t)q->res->qclass; 597 qinfo->local_alias = NULL; 598 qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len); 599 if(!qinfo->qname) { 600 return 0; 601 } 602 edns->edns_present = 1; 603 edns->ext_rcode = 0; 604 edns->edns_version = 0; 605 edns->bits = EDNS_DO; 606 edns->opt_list_in = NULL; 607 edns->opt_list_out = NULL; 608 edns->opt_list_inplace_cb_out = NULL; 609 edns->padding_block_size = 0; 610 edns->cookie_present = 0; 611 edns->cookie_valid = 0; 612 if(sldns_buffer_capacity(w->back->udp_buff) < 65535) 613 edns->udp_size = (uint16_t)sldns_buffer_capacity( 614 w->back->udp_buff); 615 else edns->udp_size = 65535; 616 return 1; 617} 618 619int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q) 620{ 621 struct libworker* w = libworker_setup(ctx, 0, NULL); 622 uint16_t qflags, qid; 623 struct query_info qinfo; 624 struct edns_data edns; 625 if(!w) 626 return UB_INITFAIL; 627 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 628 libworker_delete(w); 629 return UB_SYNTAX; 630 } 631 qid = 0; 632 qflags = BIT_RD; 633 q->w = w; 634 /* see if there is a fixed answer */ 635 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 636 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 637 if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns, 638 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0, 639 NULL, 0, NULL, 0, NULL)) { 640 regional_free_all(w->env->scratch); 641 libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 642 w->back->udp_buff, sec_status_insecure, NULL, 0); 643 libworker_delete(w); 644 free(qinfo.qname); 645 return UB_NOERROR; 646 } 647 if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones, 648 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) { 649 regional_free_all(w->env->scratch); 650 libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 651 w->back->udp_buff, sec_status_insecure, NULL, 0); 652 libworker_delete(w); 653 free(qinfo.qname); 654 return UB_NOERROR; 655 } 656 /* process new query */ 657 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 658 w->back->udp_buff, qid, libworker_fg_done_cb, q, 0)) { 659 free(qinfo.qname); 660 return UB_NOMEM; 661 } 662 free(qinfo.qname); 663 664 /* wait for reply */ 665 comm_base_dispatch(w->base); 666 667 libworker_delete(w); 668 return UB_NOERROR; 669} 670 671void 672libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf, 673 enum sec_status s, char* why_bogus, int was_ratelimited) 674{ 675 struct ctx_query* q = (struct ctx_query*)arg; 676 ub_event_callback_type cb = q->cb_event; 677 void* cb_arg = q->cb_arg; 678 int cancelled = q->cancelled; 679 680 /* delete it now */ 681 struct ub_ctx* ctx = q->w->ctx; 682 lock_basic_lock(&ctx->cfglock); 683 (void)rbtree_delete(&ctx->queries, q->node.key); 684 ctx->num_async--; 685 context_query_delete(q); 686 lock_basic_unlock(&ctx->cfglock); 687 688 if(!cancelled) { 689 /* call callback */ 690 int sec = 0; 691 if(s == sec_status_bogus) 692 sec = 1; 693 else if(s == sec_status_secure) 694 sec = 2; 695 (*cb)(cb_arg, rcode, (buf?(void*)sldns_buffer_begin(buf):NULL), 696 (buf?(int)sldns_buffer_limit(buf):0), sec, why_bogus, was_ratelimited); 697 } 698} 699 700int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q, 701 int* async_id) 702{ 703 struct libworker* w = ctx->event_worker; 704 uint16_t qflags, qid; 705 struct query_info qinfo; 706 struct edns_data edns; 707 if(!w) 708 return UB_INITFAIL; 709 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) 710 return UB_SYNTAX; 711 qid = 0; 712 qflags = BIT_RD; 713 q->w = w; 714 /* see if there is a fixed answer */ 715 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 716 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 717 if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns, 718 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0, 719 NULL, 0, NULL, 0, NULL)) { 720 regional_free_all(w->env->scratch); 721 free(qinfo.qname); 722 libworker_event_done_cb(q, LDNS_RCODE_NOERROR, 723 w->back->udp_buff, sec_status_insecure, NULL, 0); 724 return UB_NOERROR; 725 } 726 if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones, 727 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) { 728 regional_free_all(w->env->scratch); 729 free(qinfo.qname); 730 libworker_event_done_cb(q, LDNS_RCODE_NOERROR, 731 w->back->udp_buff, sec_status_insecure, NULL, 0); 732 return UB_NOERROR; 733 } 734 /* process new query */ 735 if(async_id) 736 *async_id = q->querynum; 737 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 738 w->back->udp_buff, qid, libworker_event_done_cb, q, 0)) { 739 free(qinfo.qname); 740 return UB_NOMEM; 741 } 742 free(qinfo.qname); 743 return UB_NOERROR; 744} 745 746/** add result to the bg worker result queue */ 747static void 748add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt, 749 int err, char* reason, int was_ratelimited) 750{ 751 uint8_t* msg = NULL; 752 uint32_t len = 0; 753 754 if(w->want_quit) { 755 context_query_delete(q); 756 return; 757 } 758 /* serialize and delete unneeded q */ 759 if(w->is_bg_thread) { 760 lock_basic_lock(&w->ctx->cfglock); 761 if(reason) 762 q->res->why_bogus = strdup(reason); 763 q->res->was_ratelimited = was_ratelimited; 764 if(pkt) { 765 q->msg_len = sldns_buffer_remaining(pkt); 766 q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len); 767 if(!q->msg) { 768 msg = context_serialize_answer(q, UB_NOMEM, NULL, &len); 769 } else { 770 msg = context_serialize_answer(q, err, NULL, &len); 771 } 772 } else { 773 msg = context_serialize_answer(q, err, NULL, &len); 774 } 775 lock_basic_unlock(&w->ctx->cfglock); 776 } else { 777 if(reason) 778 q->res->why_bogus = strdup(reason); 779 q->res->was_ratelimited = was_ratelimited; 780 msg = context_serialize_answer(q, err, pkt, &len); 781 (void)rbtree_delete(&w->ctx->queries, q->node.key); 782 w->ctx->num_async--; 783 context_query_delete(q); 784 } 785 786 if(!msg) { 787 log_err("out of memory for async answer"); 788 return; 789 } 790 if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) { 791 log_err("out of memory for async answer"); 792 return; 793 } 794} 795 796void 797libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s, 798 char* why_bogus, int was_ratelimited) 799{ 800 struct ctx_query* q = (struct ctx_query*)arg; 801 802 if(q->cancelled || q->w->back->want_to_quit) { 803 if(q->w->is_bg_thread) { 804 /* delete it now */ 805 struct ub_ctx* ctx = q->w->ctx; 806 lock_basic_lock(&ctx->cfglock); 807 (void)rbtree_delete(&ctx->queries, q->node.key); 808 ctx->num_async--; 809 context_query_delete(q); 810 lock_basic_unlock(&ctx->cfglock); 811 } 812 /* cancelled, do not give answer */ 813 return; 814 } 815 q->msg_security = s; 816 if(!buf) { 817 buf = q->w->env->scratch_buffer; 818 } 819 if(rcode != 0) { 820 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL); 821 } 822 add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus, was_ratelimited); 823} 824 825 826/** handle new query command for bg worker */ 827static void 828handle_newq(struct libworker* w, uint8_t* buf, uint32_t len) 829{ 830 uint16_t qflags, qid; 831 struct query_info qinfo; 832 struct edns_data edns; 833 struct ctx_query* q; 834 if(w->is_bg_thread) { 835 lock_basic_lock(&w->ctx->cfglock); 836 q = context_lookup_new_query(w->ctx, buf, len); 837 lock_basic_unlock(&w->ctx->cfglock); 838 } else { 839 q = context_deserialize_new_query(w->ctx, buf, len); 840 } 841 free(buf); 842 if(!q) { 843 log_err("failed to deserialize newq"); 844 return; 845 } 846 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 847 add_bg_result(w, q, NULL, UB_SYNTAX, NULL, 0); 848 return; 849 } 850 qid = 0; 851 qflags = BIT_RD; 852 /* see if there is a fixed answer */ 853 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 854 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 855 if(local_zones_answer(w->ctx->local_zones, w->env, &qinfo, &edns, 856 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0, 857 NULL, 0, NULL, 0, NULL)) { 858 regional_free_all(w->env->scratch); 859 q->msg_security = sec_status_insecure; 860 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL, 0); 861 free(qinfo.qname); 862 return; 863 } 864 if(w->ctx->env->auth_zones && auth_zones_answer(w->ctx->env->auth_zones, 865 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) { 866 regional_free_all(w->env->scratch); 867 q->msg_security = sec_status_insecure; 868 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL, 0); 869 free(qinfo.qname); 870 return; 871 } 872 q->w = w; 873 /* process new query */ 874 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 875 w->back->udp_buff, qid, libworker_bg_done_cb, q, 0)) { 876 add_bg_result(w, q, NULL, UB_NOMEM, NULL, 0); 877 } 878 free(qinfo.qname); 879} 880 881void libworker_alloc_cleanup(void* arg) 882{ 883 struct libworker* w = (struct libworker*)arg; 884 slabhash_clear(&w->env->rrset_cache->table); 885 slabhash_clear(w->env->msg_cache); 886} 887 888struct outbound_entry* libworker_send_query(struct query_info* qinfo, 889 uint16_t flags, int dnssec, int want_dnssec, int nocaps, 890 int check_ratelimit, 891 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone, 892 size_t zonelen, int tcp_upstream, int ssl_upstream, char* tls_auth_name, 893 struct module_qstate* q, int* was_ratelimited) 894{ 895 struct libworker* w = (struct libworker*)q->env->worker; 896 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 897 q->region, sizeof(*e)); 898 if(!e) 899 return NULL; 900 e->qstate = q; 901 e->qsent = outnet_serviced_query(w->back, qinfo, flags, dnssec, 902 want_dnssec, nocaps, check_ratelimit, tcp_upstream, ssl_upstream, 903 tls_auth_name, addr, addrlen, zone, zonelen, q, 904 libworker_handle_service_reply, e, w->back->udp_buff, q->env, 905 was_ratelimited); 906 if(!e->qsent) { 907 return NULL; 908 } 909 return e; 910} 911 912int 913libworker_handle_service_reply(struct comm_point* c, void* arg, int error, 914 struct comm_reply* reply_info) 915{ 916 struct outbound_entry* e = (struct outbound_entry*)arg; 917 struct libworker* lw = (struct libworker*)e->qstate->env->worker; 918 919 if(error != 0) { 920 mesh_report_reply(lw->env->mesh, e, reply_info, error); 921 return 0; 922 } 923 /* sanity check. */ 924 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer)) 925 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) != 926 LDNS_PACKET_QUERY 927 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) { 928 /* error becomes timeout for the module as if this reply 929 * never arrived. */ 930 mesh_report_reply(lw->env->mesh, e, reply_info, 931 NETEVENT_TIMEOUT); 932 return 0; 933 } 934 mesh_report_reply(lw->env->mesh, e, reply_info, NETEVENT_NOERROR); 935 return 0; 936} 937 938/* --- fake callbacks for fptr_wlist to work --- */ 939void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 940 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 941 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 942{ 943 log_assert(0); 944} 945 946int worker_handle_request(struct comm_point* ATTR_UNUSED(c), 947 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 948 struct comm_reply* ATTR_UNUSED(repinfo)) 949{ 950 log_assert(0); 951 return 0; 952} 953 954int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 955 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 956 struct comm_reply* ATTR_UNUSED(reply_info)) 957{ 958 log_assert(0); 959 return 0; 960} 961 962int remote_accept_callback(struct comm_point* ATTR_UNUSED(c), 963 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 964 struct comm_reply* ATTR_UNUSED(repinfo)) 965{ 966 log_assert(0); 967 return 0; 968} 969 970int remote_control_callback(struct comm_point* ATTR_UNUSED(c), 971 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 972 struct comm_reply* ATTR_UNUSED(repinfo)) 973{ 974 log_assert(0); 975 return 0; 976} 977 978void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg)) 979{ 980 log_assert(0); 981} 982 983struct outbound_entry* worker_send_query(struct query_info* ATTR_UNUSED(qinfo), 984 uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec), 985 int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps), 986 int ATTR_UNUSED(check_ratelimit), 987 struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen), 988 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream), 989 int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name), 990 struct module_qstate* ATTR_UNUSED(q), int* ATTR_UNUSED(was_ratelimited)) 991{ 992 log_assert(0); 993 return 0; 994} 995 996void 997worker_alloc_cleanup(void* ATTR_UNUSED(arg)) 998{ 999 log_assert(0); 1000} 1001 1002void worker_stat_timer_cb(void* ATTR_UNUSED(arg)) 1003{ 1004 log_assert(0); 1005} 1006 1007void worker_probe_timer_cb(void* ATTR_UNUSED(arg)) 1008{ 1009 log_assert(0); 1010} 1011 1012void worker_start_accept(void* ATTR_UNUSED(arg)) 1013{ 1014 log_assert(0); 1015} 1016 1017void worker_stop_accept(void* ATTR_UNUSED(arg)) 1018{ 1019 log_assert(0); 1020} 1021 1022int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 1023{ 1024 log_assert(0); 1025 return 0; 1026} 1027 1028int 1029codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 1030{ 1031 log_assert(0); 1032 return 0; 1033} 1034 1035int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 1036{ 1037 log_assert(0); 1038 return 0; 1039} 1040 1041void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg)) 1042{ 1043 log_assert(0); 1044} 1045 1046#ifdef UB_ON_WINDOWS 1047void 1048worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void* 1049 ATTR_UNUSED(arg)) { 1050 log_assert(0); 1051} 1052 1053void 1054wsvc_cron_cb(void* ATTR_UNUSED(arg)) 1055{ 1056 log_assert(0); 1057} 1058#endif /* UB_ON_WINDOWS */ 1059 1060#ifdef USE_DNSTAP 1061void dtio_tap_callback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 1062 void* ATTR_UNUSED(arg)) 1063{ 1064 log_assert(0); 1065} 1066#endif 1067 1068#ifdef USE_DNSTAP 1069void dtio_mainfdcallback(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), 1070 void* ATTR_UNUSED(arg)) 1071{ 1072 log_assert(0); 1073} 1074#endif 1075