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 "util/fptr_wlist.h" 59 #include "util/module.h" 60 #include "util/regional.h" 61 #include "util/random.h" 62 #include "util/config_file.h" 63 #include "util/netevent.h" 64 #include "util/storage/lookup3.h" 65 #include "util/storage/slabhash.h" 66 #include "util/net_help.h" 67 #include "util/data/dname.h" 68 #include "util/data/msgreply.h" 69 #include "util/data/msgencode.h" 70 #include "util/tube.h" 71 #include "iterator/iter_fwd.h" 72 #include "iterator/iter_hints.h" 73 #include "sldns/sbuffer.h" 74 #include "sldns/str2wire.h" 75 76 /** handle new query command for bg worker */ 77 static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len); 78 79 /** delete libworker env */ 80 static void 81 libworker_delete_env(struct libworker* w) 82 { 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 sldns_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 } 100 101 /** delete libworker struct */ 102 static void 103 libworker_delete(struct libworker* w) 104 { 105 if(!w) return; 106 libworker_delete_env(w); 107 comm_base_delete(w->base); 108 free(w); 109 } 110 111 void 112 libworker_delete_event(struct libworker* w) 113 { 114 if(!w) return; 115 libworker_delete_env(w); 116 comm_base_delete_no_base(w->base); 117 free(w); 118 } 119 120 /** setup fresh libworker struct */ 121 static struct libworker* 122 libworker_setup(struct ub_ctx* ctx, int is_bg, struct event_base* eb) 123 { 124 unsigned int seed; 125 struct libworker* w = (struct libworker*)calloc(1, sizeof(*w)); 126 struct config_file* cfg = ctx->env->cfg; 127 int* ports; 128 int numports; 129 if(!w) return NULL; 130 w->is_bg = is_bg; 131 w->ctx = ctx; 132 w->env = (struct module_env*)malloc(sizeof(*w->env)); 133 if(!w->env) { 134 free(w); 135 return NULL; 136 } 137 *w->env = *ctx->env; 138 w->env->alloc = context_obtain_alloc(ctx, !w->is_bg || w->is_bg_thread); 139 if(!w->env->alloc) { 140 libworker_delete(w); 141 return NULL; 142 } 143 w->thread_num = w->env->alloc->thread_num; 144 alloc_set_id_cleanup(w->env->alloc, &libworker_alloc_cleanup, w); 145 if(!w->is_bg || w->is_bg_thread) { 146 lock_basic_lock(&ctx->cfglock); 147 } 148 w->env->scratch = regional_create_custom(cfg->msg_buffer_size); 149 w->env->scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size); 150 w->env->fwds = forwards_create(); 151 if(w->env->fwds && !forwards_apply_cfg(w->env->fwds, cfg)) { 152 forwards_delete(w->env->fwds); 153 w->env->fwds = NULL; 154 } 155 w->env->hints = hints_create(); 156 if(w->env->hints && !hints_apply_cfg(w->env->hints, cfg)) { 157 hints_delete(w->env->hints); 158 w->env->hints = NULL; 159 } 160 if(cfg->ssl_upstream) { 161 w->sslctx = connect_sslctx_create(NULL, NULL, NULL); 162 if(!w->sslctx) { 163 /* to make the setup fail after unlock */ 164 hints_delete(w->env->hints); 165 w->env->hints = NULL; 166 } 167 } 168 if(!w->is_bg || w->is_bg_thread) { 169 lock_basic_unlock(&ctx->cfglock); 170 } 171 if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds || 172 !w->env->hints) { 173 libworker_delete(w); 174 return NULL; 175 } 176 w->env->worker = (struct worker*)w; 177 w->env->probe_timer = NULL; 178 seed = (unsigned int)time(NULL) ^ (unsigned int)getpid() ^ 179 (((unsigned int)w->thread_num)<<17); 180 seed ^= (unsigned int)w->env->alloc->next_id; 181 if(!w->is_bg || w->is_bg_thread) { 182 lock_basic_lock(&ctx->cfglock); 183 } 184 if(!(w->env->rnd = ub_initstate(seed, ctx->seed_rnd))) { 185 if(!w->is_bg || w->is_bg_thread) { 186 lock_basic_unlock(&ctx->cfglock); 187 } 188 seed = 0; 189 libworker_delete(w); 190 return NULL; 191 } 192 if(!w->is_bg || w->is_bg_thread) { 193 lock_basic_unlock(&ctx->cfglock); 194 } 195 if(1) { 196 /* primitive lockout for threading: if it overwrites another 197 * thread it is like wiping the cache (which is likely empty 198 * at the start) */ 199 /* note we are holding the ctx lock in normal threaded 200 * cases so that is solved properly, it is only for many ctx 201 * in different threads that this may clash */ 202 static int done_raninit = 0; 203 if(!done_raninit) { 204 done_raninit = 1; 205 hash_set_raninit((uint32_t)ub_random(w->env->rnd)); 206 } 207 } 208 seed = 0; 209 210 if(eb) 211 w->base = comm_base_create_event(eb); 212 else w->base = comm_base_create(0); 213 if(!w->base) { 214 libworker_delete(w); 215 return NULL; 216 } 217 if(!w->is_bg || w->is_bg_thread) { 218 lock_basic_lock(&ctx->cfglock); 219 } 220 numports = cfg_condense_ports(cfg, &ports); 221 if(numports == 0) { 222 int locked = !w->is_bg || w->is_bg_thread; 223 libworker_delete(w); 224 if(locked) { 225 lock_basic_unlock(&ctx->cfglock); 226 } 227 return NULL; 228 } 229 w->back = outside_network_create(w->base, cfg->msg_buffer_size, 230 (size_t)cfg->outgoing_num_ports, cfg->out_ifs, 231 cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6, 232 cfg->do_tcp?cfg->outgoing_num_tcp:0, 233 w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id, 234 ports, numports, cfg->unwanted_threshold, 235 &libworker_alloc_cleanup, w, cfg->do_udp, w->sslctx, 236 cfg->delay_close, NULL); 237 if(!w->is_bg || w->is_bg_thread) { 238 lock_basic_unlock(&ctx->cfglock); 239 } 240 free(ports); 241 if(!w->back) { 242 libworker_delete(w); 243 return NULL; 244 } 245 w->env->mesh = mesh_create(&ctx->mods, w->env); 246 if(!w->env->mesh) { 247 libworker_delete(w); 248 return NULL; 249 } 250 w->env->send_query = &libworker_send_query; 251 w->env->detach_subs = &mesh_detach_subs; 252 w->env->attach_sub = &mesh_attach_sub; 253 w->env->kill_sub = &mesh_state_delete; 254 w->env->detect_cycle = &mesh_detect_cycle; 255 comm_base_timept(w->base, &w->env->now, &w->env->now_tv); 256 return w; 257 } 258 259 struct libworker* libworker_create_event(struct ub_ctx* ctx, 260 struct event_base* eb) 261 { 262 return libworker_setup(ctx, 0, eb); 263 } 264 265 /** handle cancel command for bg worker */ 266 static void 267 handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len) 268 { 269 struct ctx_query* q; 270 if(w->is_bg_thread) { 271 lock_basic_lock(&w->ctx->cfglock); 272 q = context_deserialize_cancel(w->ctx, buf, len); 273 lock_basic_unlock(&w->ctx->cfglock); 274 } else { 275 q = context_deserialize_cancel(w->ctx, buf, len); 276 } 277 if(!q) { 278 /* probably simply lookup failed, i.e. the message had been 279 * processed and answered before the cancel arrived */ 280 return; 281 } 282 q->cancelled = 1; 283 free(buf); 284 } 285 286 /** do control command coming into bg server */ 287 static void 288 libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len) 289 { 290 switch(context_serial_getcmd(msg, len)) { 291 default: 292 case UB_LIBCMD_ANSWER: 293 log_err("unknown command for bg worker %d", 294 (int)context_serial_getcmd(msg, len)); 295 /* and fall through to quit */ 296 case UB_LIBCMD_QUIT: 297 free(msg); 298 comm_base_exit(w->base); 299 break; 300 case UB_LIBCMD_NEWQUERY: 301 handle_newq(w, msg, len); 302 break; 303 case UB_LIBCMD_CANCEL: 304 handle_cancel(w, msg, len); 305 break; 306 } 307 } 308 309 /** handle control command coming into server */ 310 void 311 libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 312 uint8_t* msg, size_t len, int err, void* arg) 313 { 314 struct libworker* w = (struct libworker*)arg; 315 316 if(err != 0) { 317 free(msg); 318 /* it is of no use to go on, exit */ 319 comm_base_exit(w->base); 320 return; 321 } 322 libworker_do_cmd(w, msg, len); /* also frees the buf */ 323 } 324 325 /** the background thread func */ 326 static void* 327 libworker_dobg(void* arg) 328 { 329 /* setup */ 330 uint32_t m; 331 struct libworker* w = (struct libworker*)arg; 332 struct ub_ctx* ctx; 333 if(!w) { 334 log_err("libunbound bg worker init failed, nomem"); 335 return NULL; 336 } 337 ctx = w->ctx; 338 log_thread_set(&w->thread_num); 339 #ifdef THREADS_DISABLED 340 /* we are forked */ 341 w->is_bg_thread = 0; 342 /* close non-used parts of the pipes */ 343 tube_close_write(ctx->qq_pipe); 344 tube_close_read(ctx->rr_pipe); 345 #endif 346 if(!tube_setup_bg_listen(ctx->qq_pipe, w->base, 347 libworker_handle_control_cmd, w)) { 348 log_err("libunbound bg worker init failed, no bglisten"); 349 return NULL; 350 } 351 if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) { 352 log_err("libunbound bg worker init failed, no bgwrite"); 353 return NULL; 354 } 355 356 /* do the work */ 357 comm_base_dispatch(w->base); 358 359 /* cleanup */ 360 m = UB_LIBCMD_QUIT; 361 tube_remove_bg_listen(w->ctx->qq_pipe); 362 tube_remove_bg_write(w->ctx->rr_pipe); 363 libworker_delete(w); 364 (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m, 365 (uint32_t)sizeof(m), 0); 366 #ifdef THREADS_DISABLED 367 /* close pipes from forked process before exit */ 368 tube_close_read(ctx->qq_pipe); 369 tube_close_write(ctx->rr_pipe); 370 #endif 371 return NULL; 372 } 373 374 int libworker_bg(struct ub_ctx* ctx) 375 { 376 struct libworker* w; 377 /* fork or threadcreate */ 378 lock_basic_lock(&ctx->cfglock); 379 if(ctx->dothread) { 380 lock_basic_unlock(&ctx->cfglock); 381 w = libworker_setup(ctx, 1, NULL); 382 if(!w) return UB_NOMEM; 383 w->is_bg_thread = 1; 384 #ifdef ENABLE_LOCK_CHECKS 385 w->thread_num = 1; /* for nicer DEBUG checklocks */ 386 #endif 387 ub_thread_create(&ctx->bg_tid, libworker_dobg, w); 388 } else { 389 lock_basic_unlock(&ctx->cfglock); 390 #ifndef HAVE_FORK 391 /* no fork on windows */ 392 return UB_FORKFAIL; 393 #else /* HAVE_FORK */ 394 switch((ctx->bg_pid=fork())) { 395 case 0: 396 w = libworker_setup(ctx, 1, NULL); 397 if(!w) fatal_exit("out of memory"); 398 /* close non-used parts of the pipes */ 399 tube_close_write(ctx->qq_pipe); 400 tube_close_read(ctx->rr_pipe); 401 (void)libworker_dobg(w); 402 exit(0); 403 break; 404 case -1: 405 return UB_FORKFAIL; 406 default: 407 /* close non-used parts, so that the worker 408 * bgprocess gets 'pipe closed' when the 409 * main process exits */ 410 tube_close_read(ctx->qq_pipe); 411 tube_close_write(ctx->rr_pipe); 412 break; 413 } 414 #endif /* HAVE_FORK */ 415 } 416 return UB_NOERROR; 417 } 418 419 /** get msg reply struct (in temp region) */ 420 static struct reply_info* 421 parse_reply(sldns_buffer* pkt, struct regional* region, struct query_info* qi) 422 { 423 struct reply_info* rep; 424 struct msg_parse* msg; 425 if(!(msg = regional_alloc(region, sizeof(*msg)))) { 426 return NULL; 427 } 428 memset(msg, 0, sizeof(*msg)); 429 sldns_buffer_set_position(pkt, 0); 430 if(parse_packet(pkt, msg, region) != 0) 431 return 0; 432 if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) { 433 return 0; 434 } 435 return rep; 436 } 437 438 /** insert canonname */ 439 static int 440 fill_canon(struct ub_result* res, uint8_t* s) 441 { 442 char buf[255+2]; 443 dname_str(s, buf); 444 res->canonname = strdup(buf); 445 return res->canonname != 0; 446 } 447 448 /** fill data into result */ 449 static int 450 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer, 451 uint8_t* finalcname, struct query_info* rq, struct reply_info* rep) 452 { 453 size_t i; 454 struct packed_rrset_data* data; 455 res->ttl = 0; 456 if(!answer) { 457 if(finalcname) { 458 if(!fill_canon(res, finalcname)) 459 return 0; /* out of memory */ 460 } 461 if(rep->rrset_count != 0) 462 res->ttl = (int)rep->ttl; 463 res->data = (char**)calloc(1, sizeof(char*)); 464 res->len = (int*)calloc(1, sizeof(int)); 465 return (res->data && res->len); 466 } 467 data = (struct packed_rrset_data*)answer->entry.data; 468 if(query_dname_compare(rq->qname, answer->rk.dname) != 0) { 469 if(!fill_canon(res, answer->rk.dname)) 470 return 0; /* out of memory */ 471 } else res->canonname = NULL; 472 res->data = (char**)calloc(data->count+1, sizeof(char*)); 473 res->len = (int*)calloc(data->count+1, sizeof(int)); 474 if(!res->data || !res->len) 475 return 0; /* out of memory */ 476 for(i=0; i<data->count; i++) { 477 /* remove rdlength from rdata */ 478 res->len[i] = (int)(data->rr_len[i] - 2); 479 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]); 480 if(!res->data[i]) 481 return 0; /* out of memory */ 482 } 483 /* ttl for positive answers, from CNAME and answer RRs */ 484 if(data->count != 0) { 485 size_t j; 486 res->ttl = (int)data->ttl; 487 for(j=0; j<rep->an_numrrsets; j++) { 488 struct packed_rrset_data* d = 489 (struct packed_rrset_data*)rep->rrsets[j]-> 490 entry.data; 491 if((int)d->ttl < res->ttl) 492 res->ttl = (int)d->ttl; 493 } 494 } 495 /* ttl for negative answers */ 496 if(data->count == 0 && rep->rrset_count != 0) 497 res->ttl = (int)rep->ttl; 498 res->data[data->count] = NULL; 499 res->len[data->count] = 0; 500 return 1; 501 } 502 503 /** fill result from parsed message, on error fills servfail */ 504 void 505 libworker_enter_result(struct ub_result* res, sldns_buffer* buf, 506 struct regional* temp, enum sec_status msg_security) 507 { 508 struct query_info rq; 509 struct reply_info* rep; 510 res->rcode = LDNS_RCODE_SERVFAIL; 511 rep = parse_reply(buf, temp, &rq); 512 if(!rep) { 513 log_err("cannot parse buf"); 514 return; /* error parsing buf, or out of memory */ 515 } 516 if(!fill_res(res, reply_find_answer_rrset(&rq, rep), 517 reply_find_final_cname_target(&rq, rep), &rq, rep)) 518 return; /* out of memory */ 519 /* rcode, havedata, nxdomain, secure, bogus */ 520 res->rcode = (int)FLAGS_GET_RCODE(rep->flags); 521 if(res->data && res->data[0]) 522 res->havedata = 1; 523 if(res->rcode == LDNS_RCODE_NXDOMAIN) 524 res->nxdomain = 1; 525 if(msg_security == sec_status_secure) 526 res->secure = 1; 527 if(msg_security == sec_status_bogus) 528 res->bogus = 1; 529 } 530 531 /** fillup fg results */ 532 static void 533 libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf, 534 enum sec_status s, char* why_bogus) 535 { 536 if(why_bogus) 537 q->res->why_bogus = strdup(why_bogus); 538 if(rcode != 0) { 539 q->res->rcode = rcode; 540 q->msg_security = s; 541 return; 542 } 543 544 q->res->rcode = LDNS_RCODE_SERVFAIL; 545 q->msg_security = 0; 546 q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf)); 547 q->msg_len = sldns_buffer_limit(buf); 548 if(!q->msg) { 549 return; /* the error is in the rcode */ 550 } 551 552 /* canonname and results */ 553 q->msg_security = s; 554 libworker_enter_result(q->res, buf, q->w->env->scratch, s); 555 } 556 557 void 558 libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s, 559 char* why_bogus) 560 { 561 struct ctx_query* q = (struct ctx_query*)arg; 562 /* fg query is done; exit comm base */ 563 comm_base_exit(q->w->base); 564 565 libworker_fillup_fg(q, rcode, buf, s, why_bogus); 566 } 567 568 /** setup qinfo and edns */ 569 static int 570 setup_qinfo_edns(struct libworker* w, struct ctx_query* q, 571 struct query_info* qinfo, struct edns_data* edns) 572 { 573 qinfo->qtype = (uint16_t)q->res->qtype; 574 qinfo->qclass = (uint16_t)q->res->qclass; 575 qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len); 576 if(!qinfo->qname) { 577 return 0; 578 } 579 edns->edns_present = 1; 580 edns->ext_rcode = 0; 581 edns->edns_version = 0; 582 edns->bits = EDNS_DO; 583 if(sldns_buffer_capacity(w->back->udp_buff) < 65535) 584 edns->udp_size = (uint16_t)sldns_buffer_capacity( 585 w->back->udp_buff); 586 else edns->udp_size = 65535; 587 return 1; 588 } 589 590 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q) 591 { 592 struct libworker* w = libworker_setup(ctx, 0, NULL); 593 uint16_t qflags, qid; 594 struct query_info qinfo; 595 struct edns_data edns; 596 if(!w) 597 return UB_INITFAIL; 598 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 599 libworker_delete(w); 600 return UB_SYNTAX; 601 } 602 qid = 0; 603 qflags = BIT_RD; 604 q->w = w; 605 /* see if there is a fixed answer */ 606 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 607 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 608 if(local_zones_answer(ctx->local_zones, &qinfo, &edns, 609 w->back->udp_buff, w->env->scratch, NULL)) { 610 regional_free_all(w->env->scratch); 611 libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 612 w->back->udp_buff, sec_status_insecure, NULL); 613 libworker_delete(w); 614 free(qinfo.qname); 615 return UB_NOERROR; 616 } 617 /* process new query */ 618 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 619 w->back->udp_buff, qid, libworker_fg_done_cb, q)) { 620 free(qinfo.qname); 621 return UB_NOMEM; 622 } 623 free(qinfo.qname); 624 625 /* wait for reply */ 626 comm_base_dispatch(w->base); 627 628 libworker_delete(w); 629 return UB_NOERROR; 630 } 631 632 void 633 libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf, 634 enum sec_status s, char* why_bogus) 635 { 636 struct ctx_query* q = (struct ctx_query*)arg; 637 ub_event_callback_t cb = (ub_event_callback_t)q->cb; 638 void* cb_arg = q->cb_arg; 639 int cancelled = q->cancelled; 640 641 /* delete it now */ 642 struct ub_ctx* ctx = q->w->ctx; 643 lock_basic_lock(&ctx->cfglock); 644 (void)rbtree_delete(&ctx->queries, q->node.key); 645 ctx->num_async--; 646 context_query_delete(q); 647 lock_basic_unlock(&ctx->cfglock); 648 649 if(!cancelled) { 650 /* call callback */ 651 int sec = 0; 652 if(s == sec_status_bogus) 653 sec = 1; 654 else if(s == sec_status_secure) 655 sec = 2; 656 (*cb)(cb_arg, rcode, (void*)sldns_buffer_begin(buf), 657 (int)sldns_buffer_limit(buf), sec, why_bogus); 658 } 659 } 660 661 int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q, 662 int* async_id) 663 { 664 struct libworker* w = ctx->event_worker; 665 uint16_t qflags, qid; 666 struct query_info qinfo; 667 struct edns_data edns; 668 if(!w) 669 return UB_INITFAIL; 670 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) 671 return UB_SYNTAX; 672 qid = 0; 673 qflags = BIT_RD; 674 q->w = w; 675 /* see if there is a fixed answer */ 676 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 677 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 678 if(local_zones_answer(ctx->local_zones, &qinfo, &edns, 679 w->back->udp_buff, w->env->scratch, NULL)) { 680 regional_free_all(w->env->scratch); 681 free(qinfo.qname); 682 libworker_event_done_cb(q, LDNS_RCODE_NOERROR, 683 w->back->udp_buff, sec_status_insecure, NULL); 684 return UB_NOERROR; 685 } 686 /* process new query */ 687 if(async_id) 688 *async_id = q->querynum; 689 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 690 w->back->udp_buff, qid, libworker_event_done_cb, q)) { 691 free(qinfo.qname); 692 return UB_NOMEM; 693 } 694 free(qinfo.qname); 695 return UB_NOERROR; 696 } 697 698 /** add result to the bg worker result queue */ 699 static void 700 add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt, 701 int err, char* reason) 702 { 703 uint8_t* msg = NULL; 704 uint32_t len = 0; 705 706 /* serialize and delete unneeded q */ 707 if(w->is_bg_thread) { 708 lock_basic_lock(&w->ctx->cfglock); 709 if(reason) 710 q->res->why_bogus = strdup(reason); 711 if(pkt) { 712 q->msg_len = sldns_buffer_remaining(pkt); 713 q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len); 714 if(!q->msg) 715 msg = context_serialize_answer(q, UB_NOMEM, 716 NULL, &len); 717 else msg = context_serialize_answer(q, err, 718 NULL, &len); 719 } else msg = context_serialize_answer(q, err, NULL, &len); 720 lock_basic_unlock(&w->ctx->cfglock); 721 } else { 722 if(reason) 723 q->res->why_bogus = strdup(reason); 724 msg = context_serialize_answer(q, err, pkt, &len); 725 (void)rbtree_delete(&w->ctx->queries, q->node.key); 726 w->ctx->num_async--; 727 context_query_delete(q); 728 } 729 730 if(!msg) { 731 log_err("out of memory for async answer"); 732 return; 733 } 734 if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) { 735 log_err("out of memory for async answer"); 736 return; 737 } 738 } 739 740 void 741 libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s, 742 char* why_bogus) 743 { 744 struct ctx_query* q = (struct ctx_query*)arg; 745 746 if(q->cancelled) { 747 if(q->w->is_bg_thread) { 748 /* delete it now */ 749 struct ub_ctx* ctx = q->w->ctx; 750 lock_basic_lock(&ctx->cfglock); 751 (void)rbtree_delete(&ctx->queries, q->node.key); 752 ctx->num_async--; 753 context_query_delete(q); 754 lock_basic_unlock(&ctx->cfglock); 755 } 756 /* cancelled, do not give answer */ 757 return; 758 } 759 q->msg_security = s; 760 if(!buf) 761 buf = q->w->env->scratch_buffer; 762 if(rcode != 0) { 763 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL); 764 } 765 add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus); 766 } 767 768 769 /** handle new query command for bg worker */ 770 static void 771 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len) 772 { 773 uint16_t qflags, qid; 774 struct query_info qinfo; 775 struct edns_data edns; 776 struct ctx_query* q; 777 if(w->is_bg_thread) { 778 lock_basic_lock(&w->ctx->cfglock); 779 q = context_lookup_new_query(w->ctx, buf, len); 780 lock_basic_unlock(&w->ctx->cfglock); 781 } else { 782 q = context_deserialize_new_query(w->ctx, buf, len); 783 } 784 free(buf); 785 if(!q) { 786 log_err("failed to deserialize newq"); 787 return; 788 } 789 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 790 add_bg_result(w, q, NULL, UB_SYNTAX, NULL); 791 return; 792 } 793 qid = 0; 794 qflags = BIT_RD; 795 /* see if there is a fixed answer */ 796 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 797 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 798 if(local_zones_answer(w->ctx->local_zones, &qinfo, &edns, 799 w->back->udp_buff, w->env->scratch, NULL)) { 800 regional_free_all(w->env->scratch); 801 q->msg_security = sec_status_insecure; 802 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL); 803 free(qinfo.qname); 804 return; 805 } 806 q->w = w; 807 /* process new query */ 808 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 809 w->back->udp_buff, qid, libworker_bg_done_cb, q)) { 810 add_bg_result(w, q, NULL, UB_NOMEM, NULL); 811 } 812 free(qinfo.qname); 813 } 814 815 void libworker_alloc_cleanup(void* arg) 816 { 817 struct libworker* w = (struct libworker*)arg; 818 slabhash_clear(&w->env->rrset_cache->table); 819 slabhash_clear(w->env->msg_cache); 820 } 821 822 struct outbound_entry* libworker_send_query(uint8_t* qname, size_t qnamelen, 823 uint16_t qtype, uint16_t qclass, uint16_t flags, int dnssec, 824 int want_dnssec, int nocaps, struct sockaddr_storage* addr, 825 socklen_t addrlen, uint8_t* zone, size_t zonelen, 826 struct module_qstate* q) 827 { 828 struct libworker* w = (struct libworker*)q->env->worker; 829 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 830 q->region, sizeof(*e)); 831 if(!e) 832 return NULL; 833 e->qstate = q; 834 e->qsent = outnet_serviced_query(w->back, qname, 835 qnamelen, qtype, qclass, flags, dnssec, want_dnssec, nocaps, 836 q->env->cfg->tcp_upstream, q->env->cfg->ssl_upstream, addr, 837 addrlen, zone, zonelen, libworker_handle_service_reply, e, 838 w->back->udp_buff); 839 if(!e->qsent) { 840 return NULL; 841 } 842 return e; 843 } 844 845 int 846 libworker_handle_reply(struct comm_point* c, void* arg, int error, 847 struct comm_reply* reply_info) 848 { 849 struct module_qstate* q = (struct module_qstate*)arg; 850 struct libworker* lw = (struct libworker*)q->env->worker; 851 struct outbound_entry e; 852 e.qstate = q; 853 e.qsent = NULL; 854 855 if(error != 0) { 856 mesh_report_reply(lw->env->mesh, &e, reply_info, error); 857 return 0; 858 } 859 /* sanity check. */ 860 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer)) 861 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) != 862 LDNS_PACKET_QUERY 863 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) { 864 /* error becomes timeout for the module as if this reply 865 * never arrived. */ 866 mesh_report_reply(lw->env->mesh, &e, reply_info, 867 NETEVENT_TIMEOUT); 868 return 0; 869 } 870 mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR); 871 return 0; 872 } 873 874 int 875 libworker_handle_service_reply(struct comm_point* c, void* arg, int error, 876 struct comm_reply* reply_info) 877 { 878 struct outbound_entry* e = (struct outbound_entry*)arg; 879 struct libworker* lw = (struct libworker*)e->qstate->env->worker; 880 881 if(error != 0) { 882 mesh_report_reply(lw->env->mesh, e, reply_info, error); 883 return 0; 884 } 885 /* sanity check. */ 886 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer)) 887 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) != 888 LDNS_PACKET_QUERY 889 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) { 890 /* error becomes timeout for the module as if this reply 891 * never arrived. */ 892 mesh_report_reply(lw->env->mesh, e, reply_info, 893 NETEVENT_TIMEOUT); 894 return 0; 895 } 896 mesh_report_reply(lw->env->mesh, e, reply_info, NETEVENT_NOERROR); 897 return 0; 898 } 899 900 /* --- fake callbacks for fptr_wlist to work --- */ 901 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 902 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 903 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 904 { 905 log_assert(0); 906 } 907 908 int worker_handle_request(struct comm_point* ATTR_UNUSED(c), 909 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 910 struct comm_reply* ATTR_UNUSED(repinfo)) 911 { 912 log_assert(0); 913 return 0; 914 } 915 916 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c), 917 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 918 struct comm_reply* ATTR_UNUSED(reply_info)) 919 { 920 log_assert(0); 921 return 0; 922 } 923 924 int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 925 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 926 struct comm_reply* ATTR_UNUSED(reply_info)) 927 { 928 log_assert(0); 929 return 0; 930 } 931 932 int remote_accept_callback(struct comm_point* ATTR_UNUSED(c), 933 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 934 struct comm_reply* ATTR_UNUSED(repinfo)) 935 { 936 log_assert(0); 937 return 0; 938 } 939 940 int remote_control_callback(struct comm_point* ATTR_UNUSED(c), 941 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 942 struct comm_reply* ATTR_UNUSED(repinfo)) 943 { 944 log_assert(0); 945 return 0; 946 } 947 948 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg)) 949 { 950 log_assert(0); 951 } 952 953 struct outbound_entry* worker_send_query(uint8_t* ATTR_UNUSED(qname), 954 size_t ATTR_UNUSED(qnamelen), uint16_t ATTR_UNUSED(qtype), 955 uint16_t ATTR_UNUSED(qclass), uint16_t ATTR_UNUSED(flags), 956 int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec), 957 int ATTR_UNUSED(nocaps), struct sockaddr_storage* ATTR_UNUSED(addr), 958 socklen_t ATTR_UNUSED(addrlen), uint8_t* ATTR_UNUSED(zone), 959 size_t ATTR_UNUSED(zonelen), struct module_qstate* ATTR_UNUSED(q)) 960 { 961 log_assert(0); 962 return 0; 963 } 964 965 void 966 worker_alloc_cleanup(void* ATTR_UNUSED(arg)) 967 { 968 log_assert(0); 969 } 970 971 void worker_stat_timer_cb(void* ATTR_UNUSED(arg)) 972 { 973 log_assert(0); 974 } 975 976 void worker_probe_timer_cb(void* ATTR_UNUSED(arg)) 977 { 978 log_assert(0); 979 } 980 981 void worker_start_accept(void* ATTR_UNUSED(arg)) 982 { 983 log_assert(0); 984 } 985 986 void worker_stop_accept(void* ATTR_UNUSED(arg)) 987 { 988 log_assert(0); 989 } 990 991 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 992 { 993 log_assert(0); 994 return 0; 995 } 996 997 int 998 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 999 { 1000 log_assert(0); 1001 return 0; 1002 } 1003 1004 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 1005 { 1006 log_assert(0); 1007 return 0; 1008 } 1009 1010 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg)) 1011 { 1012 log_assert(0); 1013 } 1014 1015 #ifdef UB_ON_WINDOWS 1016 void 1017 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void* 1018 ATTR_UNUSED(arg)) { 1019 log_assert(0); 1020 } 1021 1022 void 1023 wsvc_cron_cb(void* ATTR_UNUSED(arg)) 1024 { 1025 log_assert(0); 1026 } 1027 #endif /* UB_ON_WINDOWS */ 1028