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 "libunbound/worker.h" 54 #include "services/outside_network.h" 55 #include "services/mesh.h" 56 #include "services/localzone.h" 57 #include "services/cache/rrset.h" 58 #include "services/outbound_list.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/storage/lookup3.h" 66 #include "util/storage/slabhash.h" 67 #include "util/net_help.h" 68 #include "util/data/dname.h" 69 #include "util/data/msgreply.h" 70 #include "util/data/msgencode.h" 71 #include "util/tube.h" 72 #include "iterator/iter_fwd.h" 73 #include "iterator/iter_hints.h" 74 75 /** handle new query command for bg worker */ 76 static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len); 77 78 /** delete libworker struct */ 79 static void 80 libworker_delete(struct libworker* w) 81 { 82 if(!w) return; 83 if(w->env) { 84 outside_network_quit_prepare(w->back); 85 mesh_delete(w->env->mesh); 86 context_release_alloc(w->ctx, w->env->alloc, 87 !w->is_bg || w->is_bg_thread); 88 ldns_buffer_free(w->env->scratch_buffer); 89 regional_destroy(w->env->scratch); 90 forwards_delete(w->env->fwds); 91 hints_delete(w->env->hints); 92 ub_randfree(w->env->rnd); 93 free(w->env); 94 } 95 #ifdef HAVE_SSL 96 SSL_CTX_free(w->sslctx); 97 #endif 98 outside_network_delete(w->back); 99 comm_base_delete(w->base); 100 free(w); 101 } 102 103 /** setup fresh libworker struct */ 104 static struct libworker* 105 libworker_setup(struct ub_ctx* ctx, int is_bg) 106 { 107 unsigned int seed; 108 struct libworker* w = (struct libworker*)calloc(1, sizeof(*w)); 109 struct config_file* cfg = ctx->env->cfg; 110 int* ports; 111 int numports; 112 if(!w) return NULL; 113 w->is_bg = is_bg; 114 w->ctx = ctx; 115 w->env = (struct module_env*)malloc(sizeof(*w->env)); 116 if(!w->env) { 117 free(w); 118 return NULL; 119 } 120 *w->env = *ctx->env; 121 w->env->alloc = context_obtain_alloc(ctx, !w->is_bg || w->is_bg_thread); 122 if(!w->env->alloc) { 123 libworker_delete(w); 124 return NULL; 125 } 126 w->thread_num = w->env->alloc->thread_num; 127 alloc_set_id_cleanup(w->env->alloc, &libworker_alloc_cleanup, w); 128 if(!w->is_bg || w->is_bg_thread) { 129 lock_basic_lock(&ctx->cfglock); 130 } 131 w->env->scratch = regional_create_custom(cfg->msg_buffer_size); 132 w->env->scratch_buffer = ldns_buffer_new(cfg->msg_buffer_size); 133 w->env->fwds = forwards_create(); 134 if(w->env->fwds && !forwards_apply_cfg(w->env->fwds, cfg)) { 135 forwards_delete(w->env->fwds); 136 w->env->fwds = NULL; 137 } 138 w->env->hints = hints_create(); 139 if(w->env->hints && !hints_apply_cfg(w->env->hints, cfg)) { 140 hints_delete(w->env->hints); 141 w->env->hints = NULL; 142 } 143 if(cfg->ssl_upstream) { 144 w->sslctx = connect_sslctx_create(NULL, NULL, NULL); 145 if(!w->sslctx) { 146 /* to make the setup fail after unlock */ 147 hints_delete(w->env->hints); 148 w->env->hints = NULL; 149 } 150 } 151 if(!w->is_bg || w->is_bg_thread) { 152 lock_basic_unlock(&ctx->cfglock); 153 } 154 if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds || 155 !w->env->hints) { 156 libworker_delete(w); 157 return NULL; 158 } 159 w->env->worker = (struct worker*)w; 160 w->env->probe_timer = NULL; 161 seed = (unsigned int)time(NULL) ^ (unsigned int)getpid() ^ 162 (((unsigned int)w->thread_num)<<17); 163 seed ^= (unsigned int)w->env->alloc->next_id; 164 if(!w->is_bg || w->is_bg_thread) { 165 lock_basic_lock(&ctx->cfglock); 166 } 167 if(!(w->env->rnd = ub_initstate(seed, ctx->seed_rnd))) { 168 if(!w->is_bg || w->is_bg_thread) { 169 lock_basic_unlock(&ctx->cfglock); 170 } 171 seed = 0; 172 libworker_delete(w); 173 return NULL; 174 } 175 if(!w->is_bg || w->is_bg_thread) { 176 lock_basic_unlock(&ctx->cfglock); 177 } 178 if(1) { 179 /* primitive lockout for threading: if it overwrites another 180 * thread it is like wiping the cache (which is likely empty 181 * at the start) */ 182 /* note we are holding the ctx lock in normal threaded 183 * cases so that is solved properly, it is only for many ctx 184 * in different threads that this may clash */ 185 static int done_raninit = 0; 186 if(!done_raninit) { 187 done_raninit = 1; 188 hash_set_raninit((uint32_t)ub_random(w->env->rnd)); 189 } 190 } 191 seed = 0; 192 193 w->base = comm_base_create(0); 194 if(!w->base) { 195 libworker_delete(w); 196 return NULL; 197 } 198 if(!w->is_bg || w->is_bg_thread) { 199 lock_basic_lock(&ctx->cfglock); 200 } 201 numports = cfg_condense_ports(cfg, &ports); 202 if(numports == 0) { 203 libworker_delete(w); 204 return NULL; 205 } 206 w->back = outside_network_create(w->base, cfg->msg_buffer_size, 207 (size_t)cfg->outgoing_num_ports, cfg->out_ifs, 208 cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6, 209 cfg->do_tcp?cfg->outgoing_num_tcp:0, 210 w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id, 211 ports, numports, cfg->unwanted_threshold, 212 &libworker_alloc_cleanup, w, cfg->do_udp, w->sslctx); 213 if(!w->is_bg || w->is_bg_thread) { 214 lock_basic_unlock(&ctx->cfglock); 215 } 216 free(ports); 217 if(!w->back) { 218 libworker_delete(w); 219 return NULL; 220 } 221 w->env->mesh = mesh_create(&ctx->mods, w->env); 222 if(!w->env->mesh) { 223 libworker_delete(w); 224 return NULL; 225 } 226 w->env->send_query = &libworker_send_query; 227 w->env->detach_subs = &mesh_detach_subs; 228 w->env->attach_sub = &mesh_attach_sub; 229 w->env->kill_sub = &mesh_state_delete; 230 w->env->detect_cycle = &mesh_detect_cycle; 231 comm_base_timept(w->base, &w->env->now, &w->env->now_tv); 232 return w; 233 } 234 235 /** handle cancel command for bg worker */ 236 static void 237 handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len) 238 { 239 struct ctx_query* q; 240 if(w->is_bg_thread) { 241 lock_basic_lock(&w->ctx->cfglock); 242 q = context_deserialize_cancel(w->ctx, buf, len); 243 lock_basic_unlock(&w->ctx->cfglock); 244 } else { 245 q = context_deserialize_cancel(w->ctx, buf, len); 246 } 247 if(!q) { 248 /* probably simply lookup failed, i.e. the message had been 249 * processed and answered before the cancel arrived */ 250 return; 251 } 252 q->cancelled = 1; 253 free(buf); 254 } 255 256 /** do control command coming into bg server */ 257 static void 258 libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len) 259 { 260 switch(context_serial_getcmd(msg, len)) { 261 default: 262 case UB_LIBCMD_ANSWER: 263 log_err("unknown command for bg worker %d", 264 (int)context_serial_getcmd(msg, len)); 265 /* and fall through to quit */ 266 case UB_LIBCMD_QUIT: 267 free(msg); 268 comm_base_exit(w->base); 269 break; 270 case UB_LIBCMD_NEWQUERY: 271 handle_newq(w, msg, len); 272 break; 273 case UB_LIBCMD_CANCEL: 274 handle_cancel(w, msg, len); 275 break; 276 } 277 } 278 279 /** handle control command coming into server */ 280 void 281 libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 282 uint8_t* msg, size_t len, int err, void* arg) 283 { 284 struct libworker* w = (struct libworker*)arg; 285 286 if(err != 0) { 287 free(msg); 288 /* it is of no use to go on, exit */ 289 comm_base_exit(w->base); 290 return; 291 } 292 libworker_do_cmd(w, msg, len); /* also frees the buf */ 293 } 294 295 /** the background thread func */ 296 static void* 297 libworker_dobg(void* arg) 298 { 299 /* setup */ 300 uint32_t m; 301 struct libworker* w = (struct libworker*)arg; 302 struct ub_ctx* ctx; 303 if(!w) { 304 log_err("libunbound bg worker init failed, nomem"); 305 return NULL; 306 } 307 ctx = w->ctx; 308 log_thread_set(&w->thread_num); 309 #ifdef THREADS_DISABLED 310 /* we are forked */ 311 w->is_bg_thread = 0; 312 /* close non-used parts of the pipes */ 313 tube_close_write(ctx->qq_pipe); 314 tube_close_read(ctx->rr_pipe); 315 #endif 316 if(!tube_setup_bg_listen(ctx->qq_pipe, w->base, 317 libworker_handle_control_cmd, w)) { 318 log_err("libunbound bg worker init failed, no bglisten"); 319 return NULL; 320 } 321 if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) { 322 log_err("libunbound bg worker init failed, no bgwrite"); 323 return NULL; 324 } 325 326 /* do the work */ 327 comm_base_dispatch(w->base); 328 329 /* cleanup */ 330 m = UB_LIBCMD_QUIT; 331 tube_remove_bg_listen(w->ctx->qq_pipe); 332 tube_remove_bg_write(w->ctx->rr_pipe); 333 libworker_delete(w); 334 (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m, 335 (uint32_t)sizeof(m), 0); 336 #ifdef THREADS_DISABLED 337 /* close pipes from forked process before exit */ 338 tube_close_read(ctx->qq_pipe); 339 tube_close_write(ctx->rr_pipe); 340 #endif 341 return NULL; 342 } 343 344 int libworker_bg(struct ub_ctx* ctx) 345 { 346 struct libworker* w; 347 /* fork or threadcreate */ 348 lock_basic_lock(&ctx->cfglock); 349 if(ctx->dothread) { 350 lock_basic_unlock(&ctx->cfglock); 351 w = libworker_setup(ctx, 1); 352 if(!w) return UB_NOMEM; 353 w->is_bg_thread = 1; 354 #ifdef ENABLE_LOCK_CHECKS 355 w->thread_num = 1; /* for nicer DEBUG checklocks */ 356 #endif 357 ub_thread_create(&ctx->bg_tid, libworker_dobg, w); 358 } else { 359 lock_basic_unlock(&ctx->cfglock); 360 #ifndef HAVE_FORK 361 /* no fork on windows */ 362 return UB_FORKFAIL; 363 #else /* HAVE_FORK */ 364 switch((ctx->bg_pid=fork())) { 365 case 0: 366 w = libworker_setup(ctx, 1); 367 if(!w) fatal_exit("out of memory"); 368 /* close non-used parts of the pipes */ 369 tube_close_write(ctx->qq_pipe); 370 tube_close_read(ctx->rr_pipe); 371 (void)libworker_dobg(w); 372 exit(0); 373 break; 374 case -1: 375 return UB_FORKFAIL; 376 default: 377 break; 378 } 379 #endif /* HAVE_FORK */ 380 } 381 return UB_NOERROR; 382 } 383 384 /** get msg reply struct (in temp region) */ 385 static struct reply_info* 386 parse_reply(ldns_buffer* pkt, struct regional* region, struct query_info* qi) 387 { 388 struct reply_info* rep; 389 struct msg_parse* msg; 390 if(!(msg = regional_alloc(region, sizeof(*msg)))) { 391 return NULL; 392 } 393 memset(msg, 0, sizeof(*msg)); 394 ldns_buffer_set_position(pkt, 0); 395 if(parse_packet(pkt, msg, region) != 0) 396 return 0; 397 if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) { 398 return 0; 399 } 400 return rep; 401 } 402 403 /** insert canonname */ 404 static int 405 fill_canon(struct ub_result* res, uint8_t* s) 406 { 407 char buf[255+2]; 408 dname_str(s, buf); 409 res->canonname = strdup(buf); 410 return res->canonname != 0; 411 } 412 413 /** fill data into result */ 414 static int 415 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer, 416 uint8_t* finalcname, struct query_info* rq, struct reply_info* rep) 417 { 418 size_t i; 419 struct packed_rrset_data* data; 420 res->ttl = 0; 421 if(!answer) { 422 if(finalcname) { 423 if(!fill_canon(res, finalcname)) 424 return 0; /* out of memory */ 425 } 426 if(rep->rrset_count != 0) 427 res->ttl = (int)rep->ttl; 428 res->data = (char**)calloc(1, sizeof(char*)); 429 res->len = (int*)calloc(1, sizeof(int)); 430 return (res->data && res->len); 431 } 432 data = (struct packed_rrset_data*)answer->entry.data; 433 if(query_dname_compare(rq->qname, answer->rk.dname) != 0) { 434 if(!fill_canon(res, answer->rk.dname)) 435 return 0; /* out of memory */ 436 } else res->canonname = NULL; 437 res->data = (char**)calloc(data->count+1, sizeof(char*)); 438 res->len = (int*)calloc(data->count+1, sizeof(int)); 439 if(!res->data || !res->len) 440 return 0; /* out of memory */ 441 for(i=0; i<data->count; i++) { 442 /* remove rdlength from rdata */ 443 res->len[i] = (int)(data->rr_len[i] - 2); 444 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]); 445 if(!res->data[i]) 446 return 0; /* out of memory */ 447 } 448 /* ttl for positive answers, from CNAME and answer RRs */ 449 if(data->count != 0) { 450 size_t j; 451 res->ttl = (int)data->ttl; 452 for(j=0; j<rep->an_numrrsets; j++) { 453 struct packed_rrset_data* d = 454 (struct packed_rrset_data*)rep->rrsets[j]-> 455 entry.data; 456 if((int)d->ttl < res->ttl) 457 res->ttl = (int)d->ttl; 458 } 459 } 460 /* ttl for negative answers */ 461 if(data->count == 0 && rep->rrset_count != 0) 462 res->ttl = (int)rep->ttl; 463 res->data[data->count] = NULL; 464 res->len[data->count] = 0; 465 return 1; 466 } 467 468 /** fill result from parsed message, on error fills servfail */ 469 void 470 libworker_enter_result(struct ub_result* res, ldns_buffer* buf, 471 struct regional* temp, enum sec_status msg_security) 472 { 473 struct query_info rq; 474 struct reply_info* rep; 475 res->rcode = LDNS_RCODE_SERVFAIL; 476 rep = parse_reply(buf, temp, &rq); 477 if(!rep) { 478 log_err("cannot parse buf"); 479 return; /* error parsing buf, or out of memory */ 480 } 481 if(!fill_res(res, reply_find_answer_rrset(&rq, rep), 482 reply_find_final_cname_target(&rq, rep), &rq, rep)) 483 return; /* out of memory */ 484 /* rcode, havedata, nxdomain, secure, bogus */ 485 res->rcode = (int)FLAGS_GET_RCODE(rep->flags); 486 if(res->data && res->data[0]) 487 res->havedata = 1; 488 if(res->rcode == LDNS_RCODE_NXDOMAIN) 489 res->nxdomain = 1; 490 if(msg_security == sec_status_secure) 491 res->secure = 1; 492 if(msg_security == sec_status_bogus) 493 res->bogus = 1; 494 } 495 496 /** fillup fg results */ 497 static void 498 libworker_fillup_fg(struct ctx_query* q, int rcode, ldns_buffer* buf, 499 enum sec_status s, char* why_bogus) 500 { 501 if(why_bogus) 502 q->res->why_bogus = strdup(why_bogus); 503 if(rcode != 0) { 504 q->res->rcode = rcode; 505 q->msg_security = s; 506 return; 507 } 508 509 q->res->rcode = LDNS_RCODE_SERVFAIL; 510 q->msg_security = 0; 511 q->msg = memdup(ldns_buffer_begin(buf), ldns_buffer_limit(buf)); 512 q->msg_len = ldns_buffer_limit(buf); 513 if(!q->msg) { 514 return; /* the error is in the rcode */ 515 } 516 517 /* canonname and results */ 518 q->msg_security = s; 519 libworker_enter_result(q->res, buf, q->w->env->scratch, s); 520 } 521 522 void 523 libworker_fg_done_cb(void* arg, int rcode, ldns_buffer* buf, enum sec_status s, 524 char* why_bogus) 525 { 526 struct ctx_query* q = (struct ctx_query*)arg; 527 /* fg query is done; exit comm base */ 528 comm_base_exit(q->w->base); 529 530 libworker_fillup_fg(q, rcode, buf, s, why_bogus); 531 } 532 533 /** setup qinfo and edns */ 534 static int 535 setup_qinfo_edns(struct libworker* w, struct ctx_query* q, 536 struct query_info* qinfo, struct edns_data* edns) 537 { 538 ldns_rdf* rdf; 539 qinfo->qtype = (uint16_t)q->res->qtype; 540 qinfo->qclass = (uint16_t)q->res->qclass; 541 rdf = ldns_dname_new_frm_str(q->res->qname); 542 if(!rdf) { 543 return 0; 544 } 545 #ifdef UNBOUND_ALLOC_LITE 546 qinfo->qname = memdup(ldns_rdf_data(rdf), ldns_rdf_size(rdf)); 547 qinfo->qname_len = ldns_rdf_size(rdf); 548 ldns_rdf_deep_free(rdf); 549 rdf = 0; 550 #else 551 qinfo->qname = ldns_rdf_data(rdf); 552 qinfo->qname_len = ldns_rdf_size(rdf); 553 #endif 554 edns->edns_present = 1; 555 edns->ext_rcode = 0; 556 edns->edns_version = 0; 557 edns->bits = EDNS_DO; 558 if(ldns_buffer_capacity(w->back->udp_buff) < 65535) 559 edns->udp_size = (uint16_t)ldns_buffer_capacity( 560 w->back->udp_buff); 561 else edns->udp_size = 65535; 562 ldns_rdf_free(rdf); 563 return 1; 564 } 565 566 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q) 567 { 568 struct libworker* w = libworker_setup(ctx, 0); 569 uint16_t qflags, qid; 570 struct query_info qinfo; 571 struct edns_data edns; 572 if(!w) 573 return UB_INITFAIL; 574 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 575 libworker_delete(w); 576 return UB_SYNTAX; 577 } 578 qid = 0; 579 qflags = BIT_RD; 580 q->w = w; 581 /* see if there is a fixed answer */ 582 ldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 583 ldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 584 if(local_zones_answer(ctx->local_zones, &qinfo, &edns, 585 w->back->udp_buff, w->env->scratch)) { 586 regional_free_all(w->env->scratch); 587 libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 588 w->back->udp_buff, sec_status_insecure, NULL); 589 libworker_delete(w); 590 free(qinfo.qname); 591 return UB_NOERROR; 592 } 593 /* process new query */ 594 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 595 w->back->udp_buff, qid, libworker_fg_done_cb, q)) { 596 free(qinfo.qname); 597 return UB_NOMEM; 598 } 599 free(qinfo.qname); 600 601 /* wait for reply */ 602 comm_base_dispatch(w->base); 603 604 libworker_delete(w); 605 return UB_NOERROR; 606 } 607 608 /** add result to the bg worker result queue */ 609 static void 610 add_bg_result(struct libworker* w, struct ctx_query* q, ldns_buffer* pkt, 611 int err, char* reason) 612 { 613 uint8_t* msg = NULL; 614 uint32_t len = 0; 615 616 /* serialize and delete unneeded q */ 617 if(w->is_bg_thread) { 618 lock_basic_lock(&w->ctx->cfglock); 619 if(reason) 620 q->res->why_bogus = strdup(reason); 621 if(pkt) { 622 q->msg_len = ldns_buffer_remaining(pkt); 623 q->msg = memdup(ldns_buffer_begin(pkt), q->msg_len); 624 if(!q->msg) 625 msg = context_serialize_answer(q, UB_NOMEM, 626 NULL, &len); 627 else msg = context_serialize_answer(q, err, 628 NULL, &len); 629 } else msg = context_serialize_answer(q, err, NULL, &len); 630 lock_basic_unlock(&w->ctx->cfglock); 631 } else { 632 if(reason) 633 q->res->why_bogus = strdup(reason); 634 msg = context_serialize_answer(q, err, pkt, &len); 635 (void)rbtree_delete(&w->ctx->queries, q->node.key); 636 w->ctx->num_async--; 637 context_query_delete(q); 638 } 639 640 if(!msg) { 641 log_err("out of memory for async answer"); 642 return; 643 } 644 if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) { 645 log_err("out of memory for async answer"); 646 return; 647 } 648 } 649 650 void 651 libworker_bg_done_cb(void* arg, int rcode, ldns_buffer* buf, enum sec_status s, 652 char* why_bogus) 653 { 654 struct ctx_query* q = (struct ctx_query*)arg; 655 656 if(q->cancelled) { 657 if(q->w->is_bg_thread) { 658 /* delete it now */ 659 struct ub_ctx* ctx = q->w->ctx; 660 lock_basic_lock(&ctx->cfglock); 661 (void)rbtree_delete(&ctx->queries, q->node.key); 662 ctx->num_async--; 663 context_query_delete(q); 664 lock_basic_unlock(&ctx->cfglock); 665 } 666 /* cancelled, do not give answer */ 667 return; 668 } 669 q->msg_security = s; 670 if(!buf) 671 buf = q->w->env->scratch_buffer; 672 if(rcode != 0) { 673 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL); 674 } 675 add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus); 676 } 677 678 679 /** handle new query command for bg worker */ 680 static void 681 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len) 682 { 683 uint16_t qflags, qid; 684 struct query_info qinfo; 685 struct edns_data edns; 686 struct ctx_query* q; 687 if(w->is_bg_thread) { 688 lock_basic_lock(&w->ctx->cfglock); 689 q = context_lookup_new_query(w->ctx, buf, len); 690 lock_basic_unlock(&w->ctx->cfglock); 691 } else { 692 q = context_deserialize_new_query(w->ctx, buf, len); 693 } 694 free(buf); 695 if(!q) { 696 log_err("failed to deserialize newq"); 697 return; 698 } 699 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 700 add_bg_result(w, q, NULL, UB_SYNTAX, NULL); 701 return; 702 } 703 qid = 0; 704 qflags = BIT_RD; 705 /* see if there is a fixed answer */ 706 ldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 707 ldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 708 if(local_zones_answer(w->ctx->local_zones, &qinfo, &edns, 709 w->back->udp_buff, w->env->scratch)) { 710 regional_free_all(w->env->scratch); 711 q->msg_security = sec_status_insecure; 712 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL); 713 free(qinfo.qname); 714 return; 715 } 716 q->w = w; 717 /* process new query */ 718 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 719 w->back->udp_buff, qid, libworker_bg_done_cb, q)) { 720 add_bg_result(w, q, NULL, UB_NOMEM, NULL); 721 } 722 free(qinfo.qname); 723 } 724 725 void libworker_alloc_cleanup(void* arg) 726 { 727 struct libworker* w = (struct libworker*)arg; 728 slabhash_clear(&w->env->rrset_cache->table); 729 slabhash_clear(w->env->msg_cache); 730 } 731 732 struct outbound_entry* libworker_send_query(uint8_t* qname, size_t qnamelen, 733 uint16_t qtype, uint16_t qclass, uint16_t flags, int dnssec, 734 int want_dnssec, struct sockaddr_storage* addr, socklen_t addrlen, 735 uint8_t* zone, size_t zonelen, struct module_qstate* q) 736 { 737 struct libworker* w = (struct libworker*)q->env->worker; 738 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 739 q->region, sizeof(*e)); 740 if(!e) 741 return NULL; 742 e->qstate = q; 743 e->qsent = outnet_serviced_query(w->back, qname, 744 qnamelen, qtype, qclass, flags, dnssec, want_dnssec, 745 q->env->cfg->tcp_upstream, q->env->cfg->ssl_upstream, addr, 746 addrlen, zone, zonelen, libworker_handle_service_reply, e, 747 w->back->udp_buff); 748 if(!e->qsent) { 749 return NULL; 750 } 751 return e; 752 } 753 754 int 755 libworker_handle_reply(struct comm_point* c, void* arg, int error, 756 struct comm_reply* reply_info) 757 { 758 struct module_qstate* q = (struct module_qstate*)arg; 759 struct libworker* lw = (struct libworker*)q->env->worker; 760 struct outbound_entry e; 761 e.qstate = q; 762 e.qsent = NULL; 763 764 if(error != 0) { 765 mesh_report_reply(lw->env->mesh, &e, reply_info, error); 766 return 0; 767 } 768 /* sanity check. */ 769 if(!LDNS_QR_WIRE(ldns_buffer_begin(c->buffer)) 770 || LDNS_OPCODE_WIRE(ldns_buffer_begin(c->buffer)) != 771 LDNS_PACKET_QUERY 772 || LDNS_QDCOUNT(ldns_buffer_begin(c->buffer)) > 1) { 773 /* error becomes timeout for the module as if this reply 774 * never arrived. */ 775 mesh_report_reply(lw->env->mesh, &e, reply_info, 776 NETEVENT_TIMEOUT); 777 return 0; 778 } 779 mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR); 780 return 0; 781 } 782 783 int 784 libworker_handle_service_reply(struct comm_point* c, void* arg, int error, 785 struct comm_reply* reply_info) 786 { 787 struct outbound_entry* e = (struct outbound_entry*)arg; 788 struct libworker* lw = (struct libworker*)e->qstate->env->worker; 789 790 if(error != 0) { 791 mesh_report_reply(lw->env->mesh, e, reply_info, error); 792 return 0; 793 } 794 /* sanity check. */ 795 if(!LDNS_QR_WIRE(ldns_buffer_begin(c->buffer)) 796 || LDNS_OPCODE_WIRE(ldns_buffer_begin(c->buffer)) != 797 LDNS_PACKET_QUERY 798 || LDNS_QDCOUNT(ldns_buffer_begin(c->buffer)) > 1) { 799 /* error becomes timeout for the module as if this reply 800 * never arrived. */ 801 mesh_report_reply(lw->env->mesh, e, reply_info, 802 NETEVENT_TIMEOUT); 803 return 0; 804 } 805 mesh_report_reply(lw->env->mesh, e, reply_info, NETEVENT_NOERROR); 806 return 0; 807 } 808 809 /* --- fake callbacks for fptr_wlist to work --- */ 810 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 811 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 812 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 813 { 814 log_assert(0); 815 } 816 817 int worker_handle_request(struct comm_point* ATTR_UNUSED(c), 818 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 819 struct comm_reply* ATTR_UNUSED(repinfo)) 820 { 821 log_assert(0); 822 return 0; 823 } 824 825 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c), 826 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 827 struct comm_reply* ATTR_UNUSED(reply_info)) 828 { 829 log_assert(0); 830 return 0; 831 } 832 833 int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 834 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 835 struct comm_reply* ATTR_UNUSED(reply_info)) 836 { 837 log_assert(0); 838 return 0; 839 } 840 841 int remote_accept_callback(struct comm_point* ATTR_UNUSED(c), 842 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 843 struct comm_reply* ATTR_UNUSED(repinfo)) 844 { 845 log_assert(0); 846 return 0; 847 } 848 849 int remote_control_callback(struct comm_point* ATTR_UNUSED(c), 850 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 851 struct comm_reply* ATTR_UNUSED(repinfo)) 852 { 853 log_assert(0); 854 return 0; 855 } 856 857 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg)) 858 { 859 log_assert(0); 860 } 861 862 struct outbound_entry* worker_send_query(uint8_t* ATTR_UNUSED(qname), 863 size_t ATTR_UNUSED(qnamelen), uint16_t ATTR_UNUSED(qtype), 864 uint16_t ATTR_UNUSED(qclass), uint16_t ATTR_UNUSED(flags), 865 int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec), 866 struct sockaddr_storage* ATTR_UNUSED(addr), 867 socklen_t ATTR_UNUSED(addrlen), uint8_t* ATTR_UNUSED(zone), 868 size_t ATTR_UNUSED(zonelen), struct module_qstate* ATTR_UNUSED(q)) 869 { 870 log_assert(0); 871 return 0; 872 } 873 874 void 875 worker_alloc_cleanup(void* ATTR_UNUSED(arg)) 876 { 877 log_assert(0); 878 } 879 880 void worker_stat_timer_cb(void* ATTR_UNUSED(arg)) 881 { 882 log_assert(0); 883 } 884 885 void worker_probe_timer_cb(void* ATTR_UNUSED(arg)) 886 { 887 log_assert(0); 888 } 889 890 void worker_start_accept(void* ATTR_UNUSED(arg)) 891 { 892 log_assert(0); 893 } 894 895 void worker_stop_accept(void* ATTR_UNUSED(arg)) 896 { 897 log_assert(0); 898 } 899 900 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 901 { 902 log_assert(0); 903 return 0; 904 } 905 906 int 907 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 908 { 909 log_assert(0); 910 return 0; 911 } 912 913 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 914 { 915 log_assert(0); 916 return 0; 917 } 918 919 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg)) 920 { 921 log_assert(0); 922 } 923 924 #ifdef UB_ON_WINDOWS 925 void 926 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void* 927 ATTR_UNUSED(arg)) { 928 log_assert(0); 929 } 930 931 void 932 wsvc_cron_cb(void* ATTR_UNUSED(arg)) 933 { 934 log_assert(0); 935 } 936 #endif /* UB_ON_WINDOWS */ 937