libworker.c revision 296415
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 */ 77static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len); 78 79/** delete libworker env */ 80static void 81libworker_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 */ 102static void 103libworker_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 111void 112libworker_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 */ 121static struct libworker* 122libworker_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 cfg->outgoing_tcp_mss, 236 &libworker_alloc_cleanup, w, cfg->do_udp, w->sslctx, 237 cfg->delay_close, NULL); 238 if(!w->is_bg || w->is_bg_thread) { 239 lock_basic_unlock(&ctx->cfglock); 240 } 241 free(ports); 242 if(!w->back) { 243 libworker_delete(w); 244 return NULL; 245 } 246 w->env->mesh = mesh_create(&ctx->mods, w->env); 247 if(!w->env->mesh) { 248 libworker_delete(w); 249 return NULL; 250 } 251 w->env->send_query = &libworker_send_query; 252 w->env->detach_subs = &mesh_detach_subs; 253 w->env->attach_sub = &mesh_attach_sub; 254 w->env->kill_sub = &mesh_state_delete; 255 w->env->detect_cycle = &mesh_detect_cycle; 256 comm_base_timept(w->base, &w->env->now, &w->env->now_tv); 257 return w; 258} 259 260struct libworker* libworker_create_event(struct ub_ctx* ctx, 261 struct event_base* eb) 262{ 263 return libworker_setup(ctx, 0, eb); 264} 265 266/** handle cancel command for bg worker */ 267static void 268handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len) 269{ 270 struct ctx_query* q; 271 if(w->is_bg_thread) { 272 lock_basic_lock(&w->ctx->cfglock); 273 q = context_deserialize_cancel(w->ctx, buf, len); 274 lock_basic_unlock(&w->ctx->cfglock); 275 } else { 276 q = context_deserialize_cancel(w->ctx, buf, len); 277 } 278 if(!q) { 279 /* probably simply lookup failed, i.e. the message had been 280 * processed and answered before the cancel arrived */ 281 return; 282 } 283 q->cancelled = 1; 284 free(buf); 285} 286 287/** do control command coming into bg server */ 288static void 289libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len) 290{ 291 switch(context_serial_getcmd(msg, len)) { 292 default: 293 case UB_LIBCMD_ANSWER: 294 log_err("unknown command for bg worker %d", 295 (int)context_serial_getcmd(msg, len)); 296 /* and fall through to quit */ 297 case UB_LIBCMD_QUIT: 298 free(msg); 299 comm_base_exit(w->base); 300 break; 301 case UB_LIBCMD_NEWQUERY: 302 handle_newq(w, msg, len); 303 break; 304 case UB_LIBCMD_CANCEL: 305 handle_cancel(w, msg, len); 306 break; 307 } 308} 309 310/** handle control command coming into server */ 311void 312libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 313 uint8_t* msg, size_t len, int err, void* arg) 314{ 315 struct libworker* w = (struct libworker*)arg; 316 317 if(err != 0) { 318 free(msg); 319 /* it is of no use to go on, exit */ 320 comm_base_exit(w->base); 321 return; 322 } 323 libworker_do_cmd(w, msg, len); /* also frees the buf */ 324} 325 326/** the background thread func */ 327static void* 328libworker_dobg(void* arg) 329{ 330 /* setup */ 331 uint32_t m; 332 struct libworker* w = (struct libworker*)arg; 333 struct ub_ctx* ctx; 334 if(!w) { 335 log_err("libunbound bg worker init failed, nomem"); 336 return NULL; 337 } 338 ctx = w->ctx; 339 log_thread_set(&w->thread_num); 340#ifdef THREADS_DISABLED 341 /* we are forked */ 342 w->is_bg_thread = 0; 343 /* close non-used parts of the pipes */ 344 tube_close_write(ctx->qq_pipe); 345 tube_close_read(ctx->rr_pipe); 346#endif 347 if(!tube_setup_bg_listen(ctx->qq_pipe, w->base, 348 libworker_handle_control_cmd, w)) { 349 log_err("libunbound bg worker init failed, no bglisten"); 350 return NULL; 351 } 352 if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) { 353 log_err("libunbound bg worker init failed, no bgwrite"); 354 return NULL; 355 } 356 357 /* do the work */ 358 comm_base_dispatch(w->base); 359 360 /* cleanup */ 361 m = UB_LIBCMD_QUIT; 362 tube_remove_bg_listen(w->ctx->qq_pipe); 363 tube_remove_bg_write(w->ctx->rr_pipe); 364 libworker_delete(w); 365 (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m, 366 (uint32_t)sizeof(m), 0); 367#ifdef THREADS_DISABLED 368 /* close pipes from forked process before exit */ 369 tube_close_read(ctx->qq_pipe); 370 tube_close_write(ctx->rr_pipe); 371#endif 372 return NULL; 373} 374 375int libworker_bg(struct ub_ctx* ctx) 376{ 377 struct libworker* w; 378 /* fork or threadcreate */ 379 lock_basic_lock(&ctx->cfglock); 380 if(ctx->dothread) { 381 lock_basic_unlock(&ctx->cfglock); 382 w = libworker_setup(ctx, 1, NULL); 383 if(!w) return UB_NOMEM; 384 w->is_bg_thread = 1; 385#ifdef ENABLE_LOCK_CHECKS 386 w->thread_num = 1; /* for nicer DEBUG checklocks */ 387#endif 388 ub_thread_create(&ctx->bg_tid, libworker_dobg, w); 389 } else { 390 lock_basic_unlock(&ctx->cfglock); 391#ifndef HAVE_FORK 392 /* no fork on windows */ 393 return UB_FORKFAIL; 394#else /* HAVE_FORK */ 395 switch((ctx->bg_pid=fork())) { 396 case 0: 397 w = libworker_setup(ctx, 1, NULL); 398 if(!w) fatal_exit("out of memory"); 399 /* close non-used parts of the pipes */ 400 tube_close_write(ctx->qq_pipe); 401 tube_close_read(ctx->rr_pipe); 402 (void)libworker_dobg(w); 403 exit(0); 404 break; 405 case -1: 406 return UB_FORKFAIL; 407 default: 408 /* close non-used parts, so that the worker 409 * bgprocess gets 'pipe closed' when the 410 * main process exits */ 411 tube_close_read(ctx->qq_pipe); 412 tube_close_write(ctx->rr_pipe); 413 break; 414 } 415#endif /* HAVE_FORK */ 416 } 417 return UB_NOERROR; 418} 419 420/** get msg reply struct (in temp region) */ 421static struct reply_info* 422parse_reply(sldns_buffer* pkt, struct regional* region, struct query_info* qi) 423{ 424 struct reply_info* rep; 425 struct msg_parse* msg; 426 if(!(msg = regional_alloc(region, sizeof(*msg)))) { 427 return NULL; 428 } 429 memset(msg, 0, sizeof(*msg)); 430 sldns_buffer_set_position(pkt, 0); 431 if(parse_packet(pkt, msg, region) != 0) 432 return 0; 433 if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) { 434 return 0; 435 } 436 return rep; 437} 438 439/** insert canonname */ 440static int 441fill_canon(struct ub_result* res, uint8_t* s) 442{ 443 char buf[255+2]; 444 dname_str(s, buf); 445 res->canonname = strdup(buf); 446 return res->canonname != 0; 447} 448 449/** fill data into result */ 450static int 451fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer, 452 uint8_t* finalcname, struct query_info* rq, struct reply_info* rep) 453{ 454 size_t i; 455 struct packed_rrset_data* data; 456 res->ttl = 0; 457 if(!answer) { 458 if(finalcname) { 459 if(!fill_canon(res, finalcname)) 460 return 0; /* out of memory */ 461 } 462 if(rep->rrset_count != 0) 463 res->ttl = (int)rep->ttl; 464 res->data = (char**)calloc(1, sizeof(char*)); 465 res->len = (int*)calloc(1, sizeof(int)); 466 return (res->data && res->len); 467 } 468 data = (struct packed_rrset_data*)answer->entry.data; 469 if(query_dname_compare(rq->qname, answer->rk.dname) != 0) { 470 if(!fill_canon(res, answer->rk.dname)) 471 return 0; /* out of memory */ 472 } else res->canonname = NULL; 473 res->data = (char**)calloc(data->count+1, sizeof(char*)); 474 res->len = (int*)calloc(data->count+1, sizeof(int)); 475 if(!res->data || !res->len) 476 return 0; /* out of memory */ 477 for(i=0; i<data->count; i++) { 478 /* remove rdlength from rdata */ 479 res->len[i] = (int)(data->rr_len[i] - 2); 480 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]); 481 if(!res->data[i]) 482 return 0; /* out of memory */ 483 } 484 /* ttl for positive answers, from CNAME and answer RRs */ 485 if(data->count != 0) { 486 size_t j; 487 res->ttl = (int)data->ttl; 488 for(j=0; j<rep->an_numrrsets; j++) { 489 struct packed_rrset_data* d = 490 (struct packed_rrset_data*)rep->rrsets[j]-> 491 entry.data; 492 if((int)d->ttl < res->ttl) 493 res->ttl = (int)d->ttl; 494 } 495 } 496 /* ttl for negative answers */ 497 if(data->count == 0 && rep->rrset_count != 0) 498 res->ttl = (int)rep->ttl; 499 res->data[data->count] = NULL; 500 res->len[data->count] = 0; 501 return 1; 502} 503 504/** fill result from parsed message, on error fills servfail */ 505void 506libworker_enter_result(struct ub_result* res, sldns_buffer* buf, 507 struct regional* temp, enum sec_status msg_security) 508{ 509 struct query_info rq; 510 struct reply_info* rep; 511 res->rcode = LDNS_RCODE_SERVFAIL; 512 rep = parse_reply(buf, temp, &rq); 513 if(!rep) { 514 log_err("cannot parse buf"); 515 return; /* error parsing buf, or out of memory */ 516 } 517 if(!fill_res(res, reply_find_answer_rrset(&rq, rep), 518 reply_find_final_cname_target(&rq, rep), &rq, rep)) 519 return; /* out of memory */ 520 /* rcode, havedata, nxdomain, secure, bogus */ 521 res->rcode = (int)FLAGS_GET_RCODE(rep->flags); 522 if(res->data && res->data[0]) 523 res->havedata = 1; 524 if(res->rcode == LDNS_RCODE_NXDOMAIN) 525 res->nxdomain = 1; 526 if(msg_security == sec_status_secure) 527 res->secure = 1; 528 if(msg_security == sec_status_bogus) 529 res->bogus = 1; 530} 531 532/** fillup fg results */ 533static void 534libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf, 535 enum sec_status s, char* why_bogus) 536{ 537 if(why_bogus) 538 q->res->why_bogus = strdup(why_bogus); 539 if(rcode != 0) { 540 q->res->rcode = rcode; 541 q->msg_security = s; 542 return; 543 } 544 545 q->res->rcode = LDNS_RCODE_SERVFAIL; 546 q->msg_security = 0; 547 q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf)); 548 q->msg_len = sldns_buffer_limit(buf); 549 if(!q->msg) { 550 return; /* the error is in the rcode */ 551 } 552 553 /* canonname and results */ 554 q->msg_security = s; 555 libworker_enter_result(q->res, buf, q->w->env->scratch, s); 556} 557 558void 559libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s, 560 char* why_bogus) 561{ 562 struct ctx_query* q = (struct ctx_query*)arg; 563 /* fg query is done; exit comm base */ 564 comm_base_exit(q->w->base); 565 566 libworker_fillup_fg(q, rcode, buf, s, why_bogus); 567} 568 569/** setup qinfo and edns */ 570static int 571setup_qinfo_edns(struct libworker* w, struct ctx_query* q, 572 struct query_info* qinfo, struct edns_data* edns) 573{ 574 qinfo->qtype = (uint16_t)q->res->qtype; 575 qinfo->qclass = (uint16_t)q->res->qclass; 576 qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len); 577 if(!qinfo->qname) { 578 return 0; 579 } 580 edns->edns_present = 1; 581 edns->ext_rcode = 0; 582 edns->edns_version = 0; 583 edns->bits = EDNS_DO; 584 if(sldns_buffer_capacity(w->back->udp_buff) < 65535) 585 edns->udp_size = (uint16_t)sldns_buffer_capacity( 586 w->back->udp_buff); 587 else edns->udp_size = 65535; 588 return 1; 589} 590 591int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q) 592{ 593 struct libworker* w = libworker_setup(ctx, 0, NULL); 594 uint16_t qflags, qid; 595 struct query_info qinfo; 596 struct edns_data edns; 597 if(!w) 598 return UB_INITFAIL; 599 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 600 libworker_delete(w); 601 return UB_SYNTAX; 602 } 603 qid = 0; 604 qflags = BIT_RD; 605 q->w = w; 606 /* see if there is a fixed answer */ 607 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 608 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 609 if(local_zones_answer(ctx->local_zones, &qinfo, &edns, 610 w->back->udp_buff, w->env->scratch, NULL)) { 611 regional_free_all(w->env->scratch); 612 libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 613 w->back->udp_buff, sec_status_insecure, NULL); 614 libworker_delete(w); 615 free(qinfo.qname); 616 return UB_NOERROR; 617 } 618 /* process new query */ 619 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 620 w->back->udp_buff, qid, libworker_fg_done_cb, q)) { 621 free(qinfo.qname); 622 return UB_NOMEM; 623 } 624 free(qinfo.qname); 625 626 /* wait for reply */ 627 comm_base_dispatch(w->base); 628 629 libworker_delete(w); 630 return UB_NOERROR; 631} 632 633void 634libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf, 635 enum sec_status s, char* why_bogus) 636{ 637 struct ctx_query* q = (struct ctx_query*)arg; 638 ub_event_callback_t cb = (ub_event_callback_t)q->cb; 639 void* cb_arg = q->cb_arg; 640 int cancelled = q->cancelled; 641 642 /* delete it now */ 643 struct ub_ctx* ctx = q->w->ctx; 644 lock_basic_lock(&ctx->cfglock); 645 (void)rbtree_delete(&ctx->queries, q->node.key); 646 ctx->num_async--; 647 context_query_delete(q); 648 lock_basic_unlock(&ctx->cfglock); 649 650 if(!cancelled) { 651 /* call callback */ 652 int sec = 0; 653 if(s == sec_status_bogus) 654 sec = 1; 655 else if(s == sec_status_secure) 656 sec = 2; 657 (*cb)(cb_arg, rcode, (void*)sldns_buffer_begin(buf), 658 (int)sldns_buffer_limit(buf), sec, why_bogus); 659 } 660} 661 662int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q, 663 int* async_id) 664{ 665 struct libworker* w = ctx->event_worker; 666 uint16_t qflags, qid; 667 struct query_info qinfo; 668 struct edns_data edns; 669 if(!w) 670 return UB_INITFAIL; 671 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) 672 return UB_SYNTAX; 673 qid = 0; 674 qflags = BIT_RD; 675 q->w = w; 676 /* see if there is a fixed answer */ 677 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 678 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 679 if(local_zones_answer(ctx->local_zones, &qinfo, &edns, 680 w->back->udp_buff, w->env->scratch, NULL)) { 681 regional_free_all(w->env->scratch); 682 free(qinfo.qname); 683 libworker_event_done_cb(q, LDNS_RCODE_NOERROR, 684 w->back->udp_buff, sec_status_insecure, NULL); 685 return UB_NOERROR; 686 } 687 /* process new query */ 688 if(async_id) 689 *async_id = q->querynum; 690 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 691 w->back->udp_buff, qid, libworker_event_done_cb, q)) { 692 free(qinfo.qname); 693 return UB_NOMEM; 694 } 695 free(qinfo.qname); 696 return UB_NOERROR; 697} 698 699/** add result to the bg worker result queue */ 700static void 701add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt, 702 int err, char* reason) 703{ 704 uint8_t* msg = NULL; 705 uint32_t len = 0; 706 707 /* serialize and delete unneeded q */ 708 if(w->is_bg_thread) { 709 lock_basic_lock(&w->ctx->cfglock); 710 if(reason) 711 q->res->why_bogus = strdup(reason); 712 if(pkt) { 713 q->msg_len = sldns_buffer_remaining(pkt); 714 q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len); 715 if(!q->msg) 716 msg = context_serialize_answer(q, UB_NOMEM, 717 NULL, &len); 718 else msg = context_serialize_answer(q, err, 719 NULL, &len); 720 } else msg = context_serialize_answer(q, err, NULL, &len); 721 lock_basic_unlock(&w->ctx->cfglock); 722 } else { 723 if(reason) 724 q->res->why_bogus = strdup(reason); 725 msg = context_serialize_answer(q, err, pkt, &len); 726 (void)rbtree_delete(&w->ctx->queries, q->node.key); 727 w->ctx->num_async--; 728 context_query_delete(q); 729 } 730 731 if(!msg) { 732 log_err("out of memory for async answer"); 733 return; 734 } 735 if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) { 736 log_err("out of memory for async answer"); 737 return; 738 } 739} 740 741void 742libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s, 743 char* why_bogus) 744{ 745 struct ctx_query* q = (struct ctx_query*)arg; 746 747 if(q->cancelled) { 748 if(q->w->is_bg_thread) { 749 /* delete it now */ 750 struct ub_ctx* ctx = q->w->ctx; 751 lock_basic_lock(&ctx->cfglock); 752 (void)rbtree_delete(&ctx->queries, q->node.key); 753 ctx->num_async--; 754 context_query_delete(q); 755 lock_basic_unlock(&ctx->cfglock); 756 } 757 /* cancelled, do not give answer */ 758 return; 759 } 760 q->msg_security = s; 761 if(!buf) 762 buf = q->w->env->scratch_buffer; 763 if(rcode != 0) { 764 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL); 765 } 766 add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus); 767} 768 769 770/** handle new query command for bg worker */ 771static void 772handle_newq(struct libworker* w, uint8_t* buf, uint32_t len) 773{ 774 uint16_t qflags, qid; 775 struct query_info qinfo; 776 struct edns_data edns; 777 struct ctx_query* q; 778 if(w->is_bg_thread) { 779 lock_basic_lock(&w->ctx->cfglock); 780 q = context_lookup_new_query(w->ctx, buf, len); 781 lock_basic_unlock(&w->ctx->cfglock); 782 } else { 783 q = context_deserialize_new_query(w->ctx, buf, len); 784 } 785 free(buf); 786 if(!q) { 787 log_err("failed to deserialize newq"); 788 return; 789 } 790 if(!setup_qinfo_edns(w, q, &qinfo, &edns)) { 791 add_bg_result(w, q, NULL, UB_SYNTAX, NULL); 792 return; 793 } 794 qid = 0; 795 qflags = BIT_RD; 796 /* see if there is a fixed answer */ 797 sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid); 798 sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags); 799 if(local_zones_answer(w->ctx->local_zones, &qinfo, &edns, 800 w->back->udp_buff, w->env->scratch, NULL)) { 801 regional_free_all(w->env->scratch); 802 q->msg_security = sec_status_insecure; 803 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL); 804 free(qinfo.qname); 805 return; 806 } 807 q->w = w; 808 /* process new query */ 809 if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns, 810 w->back->udp_buff, qid, libworker_bg_done_cb, q)) { 811 add_bg_result(w, q, NULL, UB_NOMEM, NULL); 812 } 813 free(qinfo.qname); 814} 815 816void libworker_alloc_cleanup(void* arg) 817{ 818 struct libworker* w = (struct libworker*)arg; 819 slabhash_clear(&w->env->rrset_cache->table); 820 slabhash_clear(w->env->msg_cache); 821} 822 823struct outbound_entry* libworker_send_query(uint8_t* qname, size_t qnamelen, 824 uint16_t qtype, uint16_t qclass, uint16_t flags, int dnssec, 825 int want_dnssec, int nocaps, struct sockaddr_storage* addr, 826 socklen_t addrlen, uint8_t* zone, size_t zonelen, 827 struct module_qstate* q) 828{ 829 struct libworker* w = (struct libworker*)q->env->worker; 830 struct outbound_entry* e = (struct outbound_entry*)regional_alloc( 831 q->region, sizeof(*e)); 832 if(!e) 833 return NULL; 834 e->qstate = q; 835 e->qsent = outnet_serviced_query(w->back, qname, 836 qnamelen, qtype, qclass, flags, dnssec, want_dnssec, nocaps, 837 q->env->cfg->tcp_upstream, q->env->cfg->ssl_upstream, addr, 838 addrlen, zone, zonelen, libworker_handle_service_reply, e, 839 w->back->udp_buff); 840 if(!e->qsent) { 841 return NULL; 842 } 843 return e; 844} 845 846int 847libworker_handle_reply(struct comm_point* c, void* arg, int error, 848 struct comm_reply* reply_info) 849{ 850 struct module_qstate* q = (struct module_qstate*)arg; 851 struct libworker* lw = (struct libworker*)q->env->worker; 852 struct outbound_entry e; 853 e.qstate = q; 854 e.qsent = NULL; 855 856 if(error != 0) { 857 mesh_report_reply(lw->env->mesh, &e, reply_info, error); 858 return 0; 859 } 860 /* sanity check. */ 861 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer)) 862 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) != 863 LDNS_PACKET_QUERY 864 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) { 865 /* error becomes timeout for the module as if this reply 866 * never arrived. */ 867 mesh_report_reply(lw->env->mesh, &e, reply_info, 868 NETEVENT_TIMEOUT); 869 return 0; 870 } 871 mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR); 872 return 0; 873} 874 875int 876libworker_handle_service_reply(struct comm_point* c, void* arg, int error, 877 struct comm_reply* reply_info) 878{ 879 struct outbound_entry* e = (struct outbound_entry*)arg; 880 struct libworker* lw = (struct libworker*)e->qstate->env->worker; 881 882 if(error != 0) { 883 mesh_report_reply(lw->env->mesh, e, reply_info, error); 884 return 0; 885 } 886 /* sanity check. */ 887 if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer)) 888 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) != 889 LDNS_PACKET_QUERY 890 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) { 891 /* error becomes timeout for the module as if this reply 892 * never arrived. */ 893 mesh_report_reply(lw->env->mesh, e, reply_info, 894 NETEVENT_TIMEOUT); 895 return 0; 896 } 897 mesh_report_reply(lw->env->mesh, e, reply_info, NETEVENT_NOERROR); 898 return 0; 899} 900 901/* --- fake callbacks for fptr_wlist to work --- */ 902void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), 903 uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), 904 int ATTR_UNUSED(error), void* ATTR_UNUSED(arg)) 905{ 906 log_assert(0); 907} 908 909int worker_handle_request(struct comm_point* ATTR_UNUSED(c), 910 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 911 struct comm_reply* ATTR_UNUSED(repinfo)) 912{ 913 log_assert(0); 914 return 0; 915} 916 917int worker_handle_reply(struct comm_point* ATTR_UNUSED(c), 918 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 919 struct comm_reply* ATTR_UNUSED(reply_info)) 920{ 921 log_assert(0); 922 return 0; 923} 924 925int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c), 926 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 927 struct comm_reply* ATTR_UNUSED(reply_info)) 928{ 929 log_assert(0); 930 return 0; 931} 932 933int remote_accept_callback(struct comm_point* ATTR_UNUSED(c), 934 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 935 struct comm_reply* ATTR_UNUSED(repinfo)) 936{ 937 log_assert(0); 938 return 0; 939} 940 941int remote_control_callback(struct comm_point* ATTR_UNUSED(c), 942 void* ATTR_UNUSED(arg), int ATTR_UNUSED(error), 943 struct comm_reply* ATTR_UNUSED(repinfo)) 944{ 945 log_assert(0); 946 return 0; 947} 948 949void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg)) 950{ 951 log_assert(0); 952} 953 954struct outbound_entry* worker_send_query(uint8_t* ATTR_UNUSED(qname), 955 size_t ATTR_UNUSED(qnamelen), uint16_t ATTR_UNUSED(qtype), 956 uint16_t ATTR_UNUSED(qclass), uint16_t ATTR_UNUSED(flags), 957 int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec), 958 int ATTR_UNUSED(nocaps), struct sockaddr_storage* ATTR_UNUSED(addr), 959 socklen_t ATTR_UNUSED(addrlen), uint8_t* ATTR_UNUSED(zone), 960 size_t ATTR_UNUSED(zonelen), struct module_qstate* ATTR_UNUSED(q)) 961{ 962 log_assert(0); 963 return 0; 964} 965 966void 967worker_alloc_cleanup(void* ATTR_UNUSED(arg)) 968{ 969 log_assert(0); 970} 971 972void worker_stat_timer_cb(void* ATTR_UNUSED(arg)) 973{ 974 log_assert(0); 975} 976 977void worker_probe_timer_cb(void* ATTR_UNUSED(arg)) 978{ 979 log_assert(0); 980} 981 982void worker_start_accept(void* ATTR_UNUSED(arg)) 983{ 984 log_assert(0); 985} 986 987void worker_stop_accept(void* ATTR_UNUSED(arg)) 988{ 989 log_assert(0); 990} 991 992int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2)) 993{ 994 log_assert(0); 995 return 0; 996} 997 998int 999codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 1000{ 1001 log_assert(0); 1002 return 0; 1003} 1004 1005int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 1006{ 1007 log_assert(0); 1008 return 0; 1009} 1010 1011void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg)) 1012{ 1013 log_assert(0); 1014} 1015 1016#ifdef UB_ON_WINDOWS 1017void 1018worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void* 1019 ATTR_UNUSED(arg)) { 1020 log_assert(0); 1021} 1022 1023void 1024wsvc_cron_cb(void* ATTR_UNUSED(arg)) 1025{ 1026 log_assert(0); 1027} 1028#endif /* UB_ON_WINDOWS */ 1029