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 LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * 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 #include <ldns/dname.h> 46 #include <ldns/wire2host.h> 47 #ifdef HAVE_SSL 48 #include <openssl/ssl.h> 49 #endif 50 #include "libunbound/libworker.h" 51 #include "libunbound/context.h" 52 #include "libunbound/unbound.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 "util/module.h" 59 #include "util/regional.h" 60 #include "util/random.h" 61 #include "util/config_file.h" 62 #include "util/netevent.h" 63 #include "util/storage/lookup3.h" 64 #include "util/storage/slabhash.h" 65 #include "util/net_help.h" 66 #include "util/data/dname.h" 67 #include "util/data/msgreply.h" 68 #include "util/data/msgencode.h" 69 #include "util/tube.h" 70 #include "iterator/iter_fwd.h" 71 #include "iterator/iter_hints.h" 72 73 /** handle new query command for bg worker */ 74 static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len); 75 76 /** delete libworker struct */ 77 static void 78 libworker_delete(struct libworker* w) 79 { 80 if(!w) return; 81 if(w->env) { 82 outside_network_quit_prepare(w->back); 83 mesh_delete(w->env->mesh); 84 context_release_alloc(w->ctx, w->env->alloc, 85 !w->is_bg || w->is_bg_thread); 86 ldns_buffer_free(w->env->scratch_buffer); 87 regional_destroy(w->env->scratch); 88 forwards_delete(w->env->fwds); 89 hints_delete(w->env->hints); 90 ub_randfree(w->env->rnd); 91 free(w->env); 92 } 93 #ifdef HAVE_SSL 94 SSL_CTX_free(w->sslctx); 95 #endif 96 outside_network_delete(w->back); 97 comm_base_delete(w->base); 98 free(w); 99 } 100 101 /** setup fresh libworker struct */ 102 static struct libworker* 103 libworker_setup(struct ub_ctx* ctx, int is_bg) 104 { 105 unsigned int seed; 106 struct libworker* w = (struct libworker*)calloc(1, sizeof(*w)); 107 struct config_file* cfg = ctx->env->cfg; 108 int* ports; 109 int numports; 110 if(!w) return NULL; 111 w->is_bg = is_bg; 112 w->ctx = ctx; 113 w->env = (struct module_env*)malloc(sizeof(*w->env)); 114 if(!w->env) { 115 free(w); 116 return NULL; 117 } 118 *w->env = *ctx->env; 119 w->env->alloc = context_obtain_alloc(ctx, !w->is_bg || w->is_bg_thread); 120 if(!w->env->alloc) { 121 libworker_delete(w); 122 return NULL; 123 } 124 w->thread_num = w->env->alloc->thread_num; 125 alloc_set_id_cleanup(w->env->alloc, &libworker_alloc_cleanup, w); 126 if(!w->is_bg || w->is_bg_thread) { 127 lock_basic_lock(&ctx->cfglock); 128 } 129 w->env->scratch = regional_create_custom(cfg->msg_buffer_size); 130 w->env->scratch_buffer = ldns_buffer_new(cfg->msg_buffer_size); 131 w->env->fwds = forwards_create(); 132 if(w->env->fwds && !forwards_apply_cfg(w->env->fwds, cfg)) { 133 forwards_delete(w->env->fwds); 134 w->env->fwds = NULL; 135 } 136 w->env->hints = hints_create(); 137 if(w->env->hints && !hints_apply_cfg(w->env->hints, cfg)) { 138 hints_delete(w->env->hints); 139 w->env->hints = NULL; 140 } 141 if(cfg->ssl_upstream) { 142 w->sslctx = connect_sslctx_create(NULL, NULL, NULL); 143 if(!w->sslctx) { 144 /* to make the setup fail after unlock */ 145 hints_delete(w->env->hints); 146 w->env->hints = NULL; 147 } 148 } 149 if(!w->is_bg || w->is_bg_thread) { 150 lock_basic_unlock(&ctx->cfglock); 151 } 152 if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds || 153 !w->env->hints) { 154 libworker_delete(w); 155 return NULL; 156 } 157 w->env->worker = (struct worker*)w; 158 w->env->probe_timer = NULL; 159 seed = (unsigned int)time(NULL) ^ (unsigned int)getpid() ^ 160 (((unsigned int)w->thread_num)<<17); 161 seed ^= (unsigned int)w->env->alloc->next_id; 162 if(!w->is_bg || w->is_bg_thread) { 163 lock_basic_lock(&ctx->cfglock); 164 } 165 if(!(w->env->rnd = ub_initstate(seed, ctx->seed_rnd))) { 166 if(!w->is_bg || w->is_bg_thread) { 167 lock_basic_unlock(&ctx->cfglock); 168 } 169 seed = 0; 170 libworker_delete(w); 171 return NULL; 172 } 173 if(!w->is_bg || w->is_bg_thread) { 174 lock_basic_unlock(&ctx->cfglock); 175 } 176 if(1) { 177 /* primitive lockout for threading: if it overwrites another 178 * thread it is like wiping the cache (which is likely empty 179 * at the start) */ 180 /* note we are holding the ctx lock in normal threaded 181 * cases so that is solved properly, it is only for many ctx 182 * in different threads that this may clash */ 183 static int done_raninit = 0; 184 if(!done_raninit) { 185 done_raninit = 1; 186 hash_set_raninit((uint32_t)ub_random(w->env->rnd)); 187 } 188 } 189 seed = 0; 190 191 w->base = comm_base_create(0); 192 if(!w->base) { 193 libworker_delete(w); 194 return NULL; 195 } 196 if(!w->is_bg || w->is_bg_thread) { 197 lock_basic_lock(&ctx->cfglock); 198 } 199 numports = cfg_condense_ports(cfg, &ports); 200 if(numports == 0) { 201 libworker_delete(w); 202 return NULL; 203 } 204 w->back = outside_network_create(w->base, cfg->msg_buffer_size, 205 (size_t)cfg->outgoing_num_ports, cfg->out_ifs, 206 cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6, 207 cfg->do_tcp?cfg->outgoing_num_tcp:0, 208 w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id, 209 ports, numports, cfg->unwanted_threshold, 210 &libworker_alloc_cleanup, w, cfg->do_udp, w->sslctx); 211 if(!w->is_bg || w->is_bg_thread) { 212 lock_basic_unlock(&ctx->cfglock); 213 } 214 free(ports); 215 if(!w->back) { 216 libworker_delete(w); 217 return NULL; 218 } 219 w->env->mesh = mesh_create(&ctx->mods, w->env); 220 if(!w->env->mesh) { 221 libworker_delete(w); 222 return NULL; 223 } 224 w->env->send_query = &libworker_send_query; 225 w->env->detach_subs = &mesh_detach_subs; 226 w->env->attach_sub = &mesh_attach_sub; 227 w->env->kill_sub = &mesh_state_delete; 228 w->env->detect_cycle = &mesh_detect_cycle; 229 comm_base_timept(w->base, &w->env->now, &w->env->now_tv); 230 return w; 231 } 232 233 /** handle cancel command for bg worker */ 234 static void 235 handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len) 236 { 237 struct ctx_query* q; 238 if(w->is_bg_thread) { 239 lock_basic_lock(&w->ctx->cfglock); 240 q = context_deserialize_cancel(w->ctx, buf, len); 241 lock_basic_unlock(&w->ctx->cfglock); 242 } else { 243 q = context_deserialize_cancel(w->ctx, buf, len); 244 } 245 if(!q) { 246 /* probably simply lookup failed, i.e. the message had been 247 * processed and answered before the cancel arrived */ 248 return; 249 } 250 q->cancelled = 1; 251 free(buf); 252 } 253 254 /** do control command coming into bg server */ 255 static void 256 libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len) 257 { 258 switch(context_serial_getcmd(msg, len)) { 259 default: 260 case UB_LIBCMD_ANSWER: 261 log_err("unknown command for bg worker %d", 262 (int)context_serial_getcmd(msg, len)); 263 /* and fall through to quit */ 264 case UB_LIBCMD_QUIT: 265 free(msg); 266 comm_base_exit(w->base); 267 break; 268 case UB_LIBCMD_NEWQUERY: 269 handle_newq(w, msg, len); 270 break; 271 case UB_LIBCMD_CANCEL: 272 handle_cancel(w, msg, len); 273 break; 274 } 275 } 276 277 /** handle control command coming into server */ 278 void 279 libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 280 uint8_t* msg, size_t len, int err, void* arg) 281 { 282 struct libworker* w = (struct libworker*)arg; 283 284 if(err != 0) { 285 free(msg); 286 /* it is of no use to go on, exit */ 287 comm_base_exit(w->base); 288 return; 289 } 290 libworker_do_cmd(w, msg, len); /* also frees the buf */ 291 } 292 293 /** the background thread func */ 294 static void* 295 libworker_dobg(void* arg) 296 { 297 /* setup */ 298 uint32_t m; 299 struct libworker* w = (struct libworker*)arg; 300 struct ub_ctx* ctx; 301 if(!w) { 302 log_err("libunbound bg worker init failed, nomem"); 303 return NULL; 304 } 305 ctx = w->ctx; 306 log_thread_set(&w->thread_num); 307 #ifdef THREADS_DISABLED 308 /* we are forked */ 309 w->is_bg_thread = 0; 310 /* close non-used parts of the pipes */ 311 tube_close_write(ctx->qq_pipe); 312 tube_close_read(ctx->rr_pipe); 313 #endif 314 if(!tube_setup_bg_listen(ctx->qq_pipe, w->base, 315 libworker_handle_control_cmd, w)) { 316 log_err("libunbound bg worker init failed, no bglisten"); 317 return NULL; 318 } 319 if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) { 320 log_err("libunbound bg worker init failed, no bgwrite"); 321 return NULL; 322 } 323 324 /* do the work */ 325 comm_base_dispatch(w->base); 326 327 /* cleanup */ 328 m = UB_LIBCMD_QUIT; 329 tube_remove_bg_listen(w->ctx->qq_pipe); 330 tube_remove_bg_write(w->ctx->rr_pipe); 331 libworker_delete(w); 332 (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m, 333 (uint32_t)sizeof(m), 0); 334 #ifdef THREADS_DISABLED 335 /* close pipes from forked process before exit */ 336 tube_close_read(ctx->qq_pipe); 337 tube_close_write(ctx->rr_pipe); 338 #endif 339 return NULL; 340 } 341 342 int libworker_bg(struct ub_ctx* ctx) 343 { 344 struct libworker* w; 345 /* fork or threadcreate */ 346 lock_basic_lock(&ctx->cfglock); 347 if(ctx->dothread) { 348 lock_basic_unlock(&ctx->cfglock); 349 w = libworker_setup(ctx, 1); 350 if(!w) return UB_NOMEM; 351 w->is_bg_thread = 1; 352 #ifdef ENABLE_LOCK_CHECKS 353 w->thread_num = 1; /* for nicer DEBUG checklocks */ 354 #endif 355 ub_thread_create(&ctx->bg_tid, libworker_dobg, w); 356 } else { 357 lock_basic_unlock(&ctx->cfglock); 358 #ifndef HAVE_FORK 359 /* no fork on windows */ 360 return UB_FORKFAIL; 361 #else /* HAVE_FORK */ 362 switch((ctx->bg_pid=fork())) { 363 case 0: 364 w = libworker_setup(ctx, 1); 365 if(!w) fatal_exit("out of memory"); 366 /* close non-used parts of the pipes */ 367 tube_close_write(ctx->qq_pipe); 368 tube_close_read(ctx->rr_pipe); 369 (void)libworker_dobg(w); 370 exit(0); 371 break; 372 case -1: 373 return UB_FORKFAIL; 374 default: 375 break; 376 } 377 #endif /* HAVE_FORK */ 378 } 379 return UB_NOERROR; 380 } 381 382 /** get msg reply struct (in temp region) */ 383 static struct reply_info* 384 parse_reply(ldns_buffer* pkt, struct regional* region, struct query_info* qi) 385 { 386 struct reply_info* rep; 387 struct msg_parse* msg; 388 if(!(msg = regional_alloc(region, sizeof(*msg)))) { 389 return NULL; 390 } 391 memset(msg, 0, sizeof(*msg)); 392 ldns_buffer_set_position(pkt, 0); 393 if(parse_packet(pkt, msg, region) != 0) 394 return 0; 395 if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) { 396 return 0; 397 } 398 return rep; 399 } 400 401 /** insert canonname */ 402 static int 403 fill_canon(struct ub_result* res, uint8_t* s) 404 { 405 char buf[255+2]; 406 dname_str(s, buf); 407 res->canonname = strdup(buf); 408 return res->canonname != 0; 409 } 410 411 /** fill data into result */ 412 static int 413 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer, 414 uint8_t* finalcname, struct query_info* rq, struct reply_info* rep) 415 { 416 size_t i; 417 struct packed_rrset_data* data; 418 res->ttl = 0; 419 if(!answer) { 420 if(finalcname) { 421 if(!fill_canon(res, finalcname)) 422 return 0; /* out of memory */ 423 } 424 if(rep->rrset_count != 0) 425 res->ttl = (int)rep->ttl; 426 res->data = (char**)calloc(1, sizeof(char*)); 427 res->len = (int*)calloc(1, sizeof(int)); 428 return (res->data && res->len); 429 } 430 data = (struct packed_rrset_data*)answer->entry.data; 431 if(query_dname_compare(rq->qname, answer->rk.dname) != 0) { 432 if(!fill_canon(res, answer->rk.dname)) 433 return 0; /* out of memory */ 434 } else res->canonname = NULL; 435 res->data = (char**)calloc(data->count+1, sizeof(char*)); 436 res->len = (int*)calloc(data->count+1, sizeof(int)); 437 if(!res->data || !res->len) 438 return 0; /* out of memory */ 439 for(i=0; i<data->count; i++) { 440 /* remove rdlength from rdata */ 441 res->len[i] = (int)(data->rr_len[i] - 2); 442 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]); 443 if(!res->data[i]) 444 return 0; /* out of memory */ 445 } 446 /* ttl for positive answers, from CNAME and answer RRs */ 447 if(data->count != 0) { 448 size_t j; 449 res->ttl = (int)data->ttl; 450 for(j=0; j<rep->an_numrrsets; j++) { 451 struct packed_rrset_data* d = 452 (struct packed_rrset_data*)rep->rrsets[j]-> 453 entry.data; 454 if((int)d->ttl < res->ttl) 455 res->ttl = (int)d->ttl; 456 } 457 } 458 /* ttl for negative answers */ 459 if(data->count == 0 && rep->rrset_count != 0) 460 res->ttl = (int)rep->ttl; 461 res->data[data->count] = NULL; 462 res->len[data->count] = 0; 463 return 1; 464 } 465 466 /** fill result from parsed message, on error fills servfail */ 467 void 468 libworker_enter_result(struct ub_result* res, ldns_buffer* buf, 469 struct regional* temp, enum sec_status msg_security) 470 { 471 struct query_info rq; 472 struct reply_info* rep; 473 res->rcode = LDNS_RCODE_SERVFAIL; 474 rep = parse_reply(buf, temp, &rq); 475 if(!rep) { 476 log_err("cannot parse buf"); 477 return; /* error parsing buf, or out of memory */ 478 } 479 if(!fill_res(res, reply_find_answer_rrset(&rq, rep), 480 reply_find_final_cname_target(&rq, rep), &rq, rep)) 481 return; /* out of memory */ 482 /* rcode, havedata, nxdomain, secure, bogus */ 483 res->rcode = (int)FLAGS_GET_RCODE(rep->flags); 484 if(res->data && res->data[0]) 485 res->havedata = 1; 486 if(res->rcode == LDNS_RCODE_NXDOMAIN) 487 res->nxdomain = 1; 488 if(msg_security == sec_status_secure) 489 res->secure = 1; 490 if(msg_security == sec_status_bogus) 491 res->bogus = 1; 492 } 493 494 /** fillup fg results */ 495 static void 496 libworker_fillup_fg(struct ctx_query* q, int rcode, ldns_buffer* buf, 497 enum sec_status s, char* why_bogus) 498 { 499 if(why_bogus) 500 q->res->why_bogus = strdup(why_bogus); 501 if(rcode != 0) { 502 q->res->rcode = rcode; 503 q->msg_security = s; 504 return; 505 } 506 507 q->res->rcode = LDNS_RCODE_SERVFAIL; 508 q->msg_security = 0; 509 q->msg = memdup(ldns_buffer_begin(buf), ldns_buffer_limit(buf)); 510 q->msg_len = ldns_buffer_limit(buf); 511 if(!q->msg) { 512 return; /* the error is in the rcode */ 513 } 514 515 /* canonname and results */ 516 q->msg_security = s; 517 libworker_enter_result(q->res, buf, q->w->env->scratch, s); 518 } 519 520 void 521 libworker_fg_done_cb(void* arg, int rcode, ldns_buffer* buf, enum sec_status s, 522 char* why_bogus) 523 { 524 struct ctx_query* q = (struct ctx_query*)arg; 525 /* fg query is done; exit comm base */ 526 comm_base_exit(q->w->base); 527 528 libworker_fillup_fg(q, rcode, buf, s, why_bogus); 529 } 530 531 /** setup qinfo and edns */ 532 static int 533 setup_qinfo_edns(struct libworker* w, struct ctx_query* q, 534 struct query_info* qinfo, struct edns_data* edns) 535 { 536 ldns_rdf* rdf; 537 qinfo->qtype = (uint16_t)q->res->qtype; 538 qinfo->qclass = (uint16_t)q->res->qclass; 539 rdf = ldns_dname_new_frm_str(q->res->qname); 540 if(!rdf) { 541 return 0; 542 } 543 #ifdef UNBOUND_ALLOC_LITE 544 qinfo->qname = memdup(ldns_rdf_data(rdf), ldns_rdf_size(rdf)); 545 qinfo->qname_len = ldns_rdf_size(rdf); 546 ldns_rdf_deep_free(rdf); 547 rdf = 0; 548 #else 549 qinfo->qname = ldns_rdf_data(rdf); 550 qinfo->qname_len = ldns_rdf_size(rdf); 551 #endif 552 edns->edns_present = 1; 553 edns->ext_rcode = 0; 554 edns->edns_version = 0; 555 edns->bits = EDNS_DO; 556 if(ldns_buffer_capacity(w->back->udp_buff) < 65535) 557 edns->udp_size = (uint16_t)ldns_buffer_capacity( 558 w->back->udp_buff); 559 else edns->udp_size = 65535; 560 ldns_rdf_free(rdf); 561 return 1; 562 } 563 564 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q) 565 { 566 struct libworker* w = libworker_setup(ctx, 0); 567 uint16_t qflags, qid; 568 struct query_info qinfo; 569 struct edns_data edns; 570 if(!w) 571 return UB_INITFAIL; 572 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 573 libworker_delete(w); 574 return UB_SYNTAX; 575 } 576 qid = 0; 577 qflags = BIT_RD; 578 q->w = w; 579 /* see if there is a fixed answer */ 580 ldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 581 ldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 582 if(local_zones_answer(ctx->local_zones, &qinfo, &edns, 583 w->back->udp_buff, w->env->scratch)) { 584 regional_free_all(w->env->scratch); 585 libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 586 w->back->udp_buff, sec_status_insecure, NULL); 587 libworker_delete(w); 588 free(qinfo.qname); 589 return UB_NOERROR; 590 } 591 /* process new query */ 592 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 593 w->back->udp_buff, qid, libworker_fg_done_cb, q)) { 594 free(qinfo.qname); 595 return UB_NOMEM; 596 } 597 free(qinfo.qname); 598 599 /* wait for reply */ 600 comm_base_dispatch(w->base); 601 602 libworker_delete(w); 603 return UB_NOERROR; 604 } 605 606 /** add result to the bg worker result queue */ 607 static void 608 add_bg_result(struct libworker* w, struct ctx_query* q, ldns_buffer* pkt, 609 int err, char* reason) 610 { 611 uint8_t* msg = NULL; 612 uint32_t len = 0; 613 614 /* serialize and delete unneeded q */ 615 if(w->is_bg_thread) { 616 lock_basic_lock(&w->ctx->cfglock); 617 if(reason) 618 q->res->why_bogus = strdup(reason); 619 if(pkt) { 620 q->msg_len = ldns_buffer_remaining(pkt); 621 q->msg = memdup(ldns_buffer_begin(pkt), q->msg_len); 622 if(!q->msg) 623 msg = context_serialize_answer(q, UB_NOMEM, 624 NULL, &len); 625 else msg = context_serialize_answer(q, err, 626 NULL, &len); 627 } else msg = context_serialize_answer(q, err, NULL, &len); 628 lock_basic_unlock(&w->ctx->cfglock); 629 } else { 630 if(reason) 631 q->res->why_bogus = strdup(reason); 632 msg = context_serialize_answer(q, err, pkt, &len); 633 (void)rbtree_delete(&w->ctx->queries, q->node.key); 634 w->ctx->num_async--; 635 context_query_delete(q); 636 } 637 638 if(!msg) { 639 log_err("out of memory for async answer"); 640 return; 641 } 642 if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) { 643 log_err("out of memory for async answer"); 644 return; 645 } 646 } 647 648 void 649 libworker_bg_done_cb(void* arg, int rcode, ldns_buffer* buf, enum sec_status s, 650 char* why_bogus) 651 { 652 struct ctx_query* q = (struct ctx_query*)arg; 653 654 if(q->cancelled) { 655 if(q->w->is_bg_thread) { 656 /* delete it now */ 657 struct ub_ctx* ctx = q->w->ctx; 658 lock_basic_lock(&ctx->cfglock); 659 (void)rbtree_delete(&ctx->queries, q->node.key); 660 ctx->num_async--; 661 context_query_delete(q); 662 lock_basic_unlock(&ctx->cfglock); 663 } 664 /* cancelled, do not give answer */ 665 return; 666 } 667 q->msg_security = s; 668 if(!buf) 669 buf = q->w->env->scratch_buffer; 670 if(rcode != 0) { 671 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL); 672 } 673 add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus); 674 } 675 676 677 /** handle new query command for bg worker */ 678 static void 679 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len) 680 { 681 uint16_t qflags, qid; 682 struct query_info qinfo; 683 struct edns_data edns; 684 struct ctx_query* q; 685 if(w->is_bg_thread) { 686 lock_basic_lock(&w->ctx->cfglock); 687 q = context_lookup_new_query(w->ctx, buf, len); 688 lock_basic_unlock(&w->ctx->cfglock); 689 } else { 690 q = context_deserialize_new_query(w->ctx, buf, len); 691 } 692 free(buf); 693 if(!q) { 694 log_err("failed to deserialize newq"); 695 return; 696 } 697 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 698 add_bg_result(w, q, NULL, UB_SYNTAX, NULL); 699 return; 700 } 701 qid = 0; 702 qflags = BIT_RD; 703 /* see if there is a fixed answer */ 704 ldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 705 ldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 706 if(local_zones_answer(w->ctx->local_zones, &qinfo, &edns, 707 w->back->udp_buff, w->env->scratch)) { 708 regional_free_all(w->env->scratch); 709 q->msg_security = sec_status_insecure; 710 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL); 711 free(qinfo.qname); 712 return; 713 } 714 q->w = w; 715 /* process new query */ 716 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 717 w->back->udp_buff, qid, libworker_bg_done_cb, q)) { 718 add_bg_result(w, q, NULL, UB_NOMEM, NULL); 719 } 720 free(qinfo.qname); 721 } 722 723 void libworker_alloc_cleanup(void* arg) 724 { 725 struct libworker* w = (struct libworker*)arg; 726 slabhash_clear(&w->env->rrset_cache->table); 727 slabhash_clear(w->env->msg_cache); 728 } 729 730 struct outbound_entry* libworker_send_query(uint8_t* qname, size_t qnamelen, 731 uint16_t qtype, uint16_t qclass, uint16_t flags, int dnssec, 732 int want_dnssec, struct sockaddr_storage* addr, socklen_t addrlen, 733 uint8_t* zone, size_t zonelen, struct module_qstate* q) 734 { 735 struct libworker* w = (struct libworker*)q->env->worker; 736 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 737 q->region, sizeof(*e)); 738 if(!e) 739 return NULL; 740 e->qstate = q; 741 e->qsent = outnet_serviced_query(w->back, qname, 742 qnamelen, qtype, qclass, flags, dnssec, want_dnssec, 743 q->env->cfg->tcp_upstream, q->env->cfg->ssl_upstream, addr, 744 addrlen, zone, zonelen, libworker_handle_service_reply, e, 745 w->back->udp_buff); 746 if(!e->qsent) { 747 return NULL; 748 } 749 return e; 750 } 751 752 int 753 libworker_handle_reply(struct comm_point* c, void* arg, int error, 754 struct comm_reply* reply_info) 755 { 756 struct module_qstate* q = (struct module_qstate*)arg; 757 struct libworker* lw = (struct libworker*)q->env->worker; 758 struct outbound_entry e; 759 e.qstate = q; 760 e.qsent = NULL; 761 762 if(error != 0) { 763 mesh_report_reply(lw->env->mesh, &e, reply_info, error); 764 return 0; 765 } 766 /* sanity check. */ 767 if(!LDNS_QR_WIRE(ldns_buffer_begin(c->buffer)) 768 || LDNS_OPCODE_WIRE(ldns_buffer_begin(c->buffer)) != 769 LDNS_PACKET_QUERY 770 || LDNS_QDCOUNT(ldns_buffer_begin(c->buffer)) > 1) { 771 /* error becomes timeout for the module as if this reply 772 * never arrived. */ 773 mesh_report_reply(lw->env->mesh, &e, reply_info, 774 NETEVENT_TIMEOUT); 775 return 0; 776 } 777 mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR); 778 return 0; 779 } 780 781 int 782 libworker_handle_service_reply(struct comm_point* c, void* arg, int error, 783 struct comm_reply* reply_info) 784 { 785 struct outbound_entry* e = (struct outbound_entry*)arg; 786 struct libworker* lw = (struct libworker*)e->qstate->env->worker; 787 788 if(error != 0) { 789 mesh_report_reply(lw->env->mesh, e, reply_info, error); 790 return 0; 791 } 792 /* sanity check. */ 793 if(!LDNS_QR_WIRE(ldns_buffer_begin(c->buffer)) 794 || LDNS_OPCODE_WIRE(ldns_buffer_begin(c->buffer)) != 795 LDNS_PACKET_QUERY 796 || LDNS_QDCOUNT(ldns_buffer_begin(c->buffer)) > 1) { 797 /* error becomes timeout for the module as if this reply 798 * never arrived. */ 799 mesh_report_reply(lw->env->mesh, e, reply_info, 800 NETEVENT_TIMEOUT); 801 return 0; 802 } 803 mesh_report_reply(lw->env->mesh, e, reply_info, NETEVENT_NOERROR); 804 return 0; 805 } 806 807 /* --- fake callbacks for fptr_wlist to work --- */ 808 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 809 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 810 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 811 { 812 log_assert(0); 813 } 814 815 int worker_handle_request(struct comm_point* ATTR_UNUSED(c), 816 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 817 struct comm_reply* ATTR_UNUSED(repinfo)) 818 { 819 log_assert(0); 820 return 0; 821 } 822 823 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c), 824 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 825 struct comm_reply* ATTR_UNUSED(reply_info)) 826 { 827 log_assert(0); 828 return 0; 829 } 830 831 int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 832 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 833 struct comm_reply* ATTR_UNUSED(reply_info)) 834 { 835 log_assert(0); 836 return 0; 837 } 838 839 int remote_accept_callback(struct comm_point* ATTR_UNUSED(c), 840 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 841 struct comm_reply* ATTR_UNUSED(repinfo)) 842 { 843 log_assert(0); 844 return 0; 845 } 846 847 int remote_control_callback(struct comm_point* ATTR_UNUSED(c), 848 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 849 struct comm_reply* ATTR_UNUSED(repinfo)) 850 { 851 log_assert(0); 852 return 0; 853 } 854 855 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg)) 856 { 857 log_assert(0); 858 } 859 860 struct outbound_entry* worker_send_query(uint8_t* ATTR_UNUSED(qname), 861 size_t ATTR_UNUSED(qnamelen), uint16_t ATTR_UNUSED(qtype), 862 uint16_t ATTR_UNUSED(qclass), uint16_t ATTR_UNUSED(flags), 863 int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec), 864 struct sockaddr_storage* ATTR_UNUSED(addr), 865 socklen_t ATTR_UNUSED(addrlen), struct module_qstate* ATTR_UNUSED(q)) 866 { 867 log_assert(0); 868 return 0; 869 } 870 871 void 872 worker_alloc_cleanup(void* ATTR_UNUSED(arg)) 873 { 874 log_assert(0); 875 } 876 877 void worker_stat_timer_cb(void* ATTR_UNUSED(arg)) 878 { 879 log_assert(0); 880 } 881 882 void worker_probe_timer_cb(void* ATTR_UNUSED(arg)) 883 { 884 log_assert(0); 885 } 886 887 void worker_start_accept(void* ATTR_UNUSED(arg)) 888 { 889 log_assert(0); 890 } 891 892 void worker_stop_accept(void* ATTR_UNUSED(arg)) 893 { 894 log_assert(0); 895 } 896 897 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 898 { 899 log_assert(0); 900 return 0; 901 } 902 903 int 904 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 905 { 906 log_assert(0); 907 return 0; 908 } 909 910 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 911 { 912 log_assert(0); 913 return 0; 914 } 915 916 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg)) 917 { 918 log_assert(0); 919 } 920 921 #ifdef UB_ON_WINDOWS 922 void 923 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void* 924 ATTR_UNUSED(arg)) { 925 log_assert(0); 926 } 927 928 void 929 wsvc_cron_cb(void* ATTR_UNUSED(arg)) 930 { 931 log_assert(0); 932 } 933 #endif /* UB_ON_WINDOWS */ 934