contrib/unbound/libunbound/libworker.c

   1 /*
   2  * libunbound/worker.c - worker thread or process that resolves
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file contains the worker process or thread that performs
  40  * the DNS resolving and validation. The worker is called by a procedure
  41  * and if in the background continues until exit, if in the foreground
  42  * returns from the procedure when done.
  43  */
  44 #include "config.h"
  45 #ifdef HAVE_SSL
  46 #include <openssl/ssl.h>
  47 #endif
  48 #include "libunbound/libworker.h"
  49 #include "libunbound/context.h"
  50 #include "libunbound/unbound.h"
  51 #include "libunbound/worker.h"
  52 #include "libunbound/unbound-event.h"
  53 #include "services/outside_network.h"
  54 #include "services/mesh.h"
  55 #include "services/localzone.h"
  56 #include "services/cache/rrset.h"
  57 #include "services/outbound_list.h"
  58 #include "services/authzone.h"
  59 #include "util/fptr_wlist.h"
  60 #include "util/module.h"
  61 #include "util/regional.h"
  62 #include "util/random.h"
  63 #include "util/config_file.h"
  64 #include "util/netevent.h"
  65 #include "util/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 #include "sldns/sbuffer.h"
  75 #include "sldns/str2wire.h"
  76
  77 /** handle new query command for bg worker */
  78 static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len);
  79
  80 /** delete libworker env */
  81 static void
  82 libworker_delete_env(struct libworker* w)
  83 {
  84         if(w->env) {
  85                 outside_network_quit_prepare(w->back);
  86                 mesh_delete(w->env->mesh);
  87                 context_release_alloc(w->ctx, w->env->alloc,
  88                         !w->is_bg || w->is_bg_thread);
  89                 sldns_buffer_free(w->env->scratch_buffer);
  90                 regional_destroy(w->env->scratch);
  91                 forwards_delete(w->env->fwds);
  92                 hints_delete(w->env->hints);
  93                 ub_randfree(w->env->rnd);
  94                 free(w->env);
  95         }
  96 #ifdef HAVE_SSL
  97         SSL_CTX_free(w->sslctx);
  98 #endif
  99         outside_network_delete(w->back);
 100 }
 101
 102 /** delete libworker struct */
 103 static void
 104 libworker_delete(struct libworker* w)
 105 {
 106         if(!w) return;
 107         libworker_delete_env(w);
 108         comm_base_delete(w->base);
 109         free(w);
 110 }
 111
 112 void
 113 libworker_delete_event(struct libworker* w)
 114 {
 115         if(!w) return;
 116         libworker_delete_env(w);
 117         comm_base_delete_no_base(w->base);
 118         free(w);
 119 }
 120
 121 /** setup fresh libworker struct */
 122 static struct libworker*
 123 libworker_setup(struct ub_ctx* ctx, int is_bg, struct ub_event_base* eb)
 124 {
 125         unsigned int seed;
 126         struct libworker* w = (struct libworker*)calloc(1, sizeof(*w));
 127         struct config_file* cfg = ctx->env->cfg;
 128         int* ports;
 129         int numports;
 130         if(!w) return NULL;
 131         w->is_bg = is_bg;
 132         w->ctx = ctx;
 133         w->env = (struct module_env*)malloc(sizeof(*w->env));
 134         if(!w->env) {
 135                 free(w);
 136                 return NULL;
 137         }
 138         *w->env = *ctx->env;
 139         w->env->alloc = context_obtain_alloc(ctx, !w->is_bg || w->is_bg_thread);
 140         if(!w->env->alloc) {
 141                 libworker_delete(w);
 142                 return NULL;
 143         }
 144         w->thread_num = w->env->alloc->thread_num;
 145         alloc_set_id_cleanup(w->env->alloc, &libworker_alloc_cleanup, w);
 146         if(!w->is_bg || w->is_bg_thread) {
 147                 lock_basic_lock(&ctx->cfglock);
 148         }
 149         w->env->scratch = regional_create_custom(cfg->msg_buffer_size);
 150         w->env->scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size);
 151         w->env->fwds = forwards_create();
 152         if(w->env->fwds && !forwards_apply_cfg(w->env->fwds, cfg)) {
 153                 forwards_delete(w->env->fwds);
 154                 w->env->fwds = NULL;
 155         }
 156         w->env->hints = hints_create();
 157         if(w->env->hints && !hints_apply_cfg(w->env->hints, cfg)) {
 158                 hints_delete(w->env->hints);
 159                 w->env->hints = NULL;
 160         }
 161         if(cfg->ssl_upstream || (cfg->tls_cert_bundle && cfg->tls_cert_bundle[0]) || cfg->tls_win_cert) {
 162                 w->sslctx = connect_sslctx_create(NULL, NULL,
 163                         cfg->tls_cert_bundle, cfg->tls_win_cert);
 164                 if(!w->sslctx) {
 165                         /* to make the setup fail after unlock */
 166                         hints_delete(w->env->hints);
 167                         w->env->hints = NULL;
 168                 }
 169         }
 170         if(!w->is_bg || w->is_bg_thread) {
 171                 lock_basic_unlock(&ctx->cfglock);
 172         }
 173         if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds ||
 174                 !w->env->hints) {
 175                 libworker_delete(w);
 176                 return NULL;
 177         }
 178         w->env->worker = (struct worker*)w;
 179         w->env->probe_timer = NULL;
 180         seed = (unsigned int)time(NULL) ^ (unsigned int)getpid() ^
 181                 (((unsigned int)w->thread_num)<<17);
 182         seed ^= (unsigned int)w->env->alloc->next_id;
 183         if(!w->is_bg || w->is_bg_thread) {
 184                 lock_basic_lock(&ctx->cfglock);
 185         }
 186         if(!(w->env->rnd = ub_initstate(seed, ctx->seed_rnd))) {
 187                 if(!w->is_bg || w->is_bg_thread) {
 188                         lock_basic_unlock(&ctx->cfglock);
 189                 }
 190                 seed = 0;
 191                 libworker_delete(w);
 192                 return NULL;
 193         }
 194         if(!w->is_bg || w->is_bg_thread) {
 195                 lock_basic_unlock(&ctx->cfglock);
 196         }
 197         if(1) {
 198                 /* primitive lockout for threading: if it overwrites another
 199                  * thread it is like wiping the cache (which is likely empty
 200                  * at the start) */
 201                 /* note we are holding the ctx lock in normal threaded
 202                  * cases so that is solved properly, it is only for many ctx
 203                  * in different threads that this may clash */
 204                 static int done_raninit = 0;
 205                 if(!done_raninit) {
 206                         done_raninit = 1;
 207                         hash_set_raninit((uint32_t)ub_random(w->env->rnd));
 208                 }
 209         }
 210         seed = 0;
 211
 212         if(eb)
 213                 w->base = comm_base_create_event(eb);
 214         else    w->base = comm_base_create(0);
 215         if(!w->base) {
 216                 libworker_delete(w);
 217                 return NULL;
 218         }
 219         w->env->worker_base = w->base;
 220         if(!w->is_bg || w->is_bg_thread) {
 221                 lock_basic_lock(&ctx->cfglock);
 222         }
 223         numports = cfg_condense_ports(cfg, &ports);
 224         if(numports == 0) {
 225                 int locked = !w->is_bg || w->is_bg_thread;
 226                 libworker_delete(w);
 227                 if(locked) {
 228                         lock_basic_unlock(&ctx->cfglock);
 229                 }
 230                 return NULL;
 231         }
 232         w->back = outside_network_create(w->base, cfg->msg_buffer_size,
 233                 (size_t)cfg->outgoing_num_ports, cfg->out_ifs,
 234                 cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6,
 235                 cfg->do_tcp?cfg->outgoing_num_tcp:0,
 236                 w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id,
 237                 ports, numports, cfg->unwanted_threshold,
 238                 cfg->outgoing_tcp_mss, &libworker_alloc_cleanup, w,
 239                 cfg->do_udp || cfg->udp_upstream_without_downstream, w->sslctx,
 240                 cfg->delay_close, NULL);
 241         w->env->outnet = w->back;
 242         if(!w->is_bg || w->is_bg_thread) {
 243                 lock_basic_unlock(&ctx->cfglock);
 244         }
 245         free(ports);
 246         if(!w->back) {
 247                 libworker_delete(w);
 248                 return NULL;
 249         }
 250         w->env->mesh = mesh_create(&ctx->mods, w->env);
 251         if(!w->env->mesh) {
 252                 libworker_delete(w);
 253                 return NULL;
 254         }
 255         w->env->send_query = &libworker_send_query;
 256         w->env->detach_subs = &mesh_detach_subs;
 257         w->env->attach_sub = &mesh_attach_sub;
 258         w->env->add_sub = &mesh_add_sub;
 259         w->env->kill_sub = &mesh_state_delete;
 260         w->env->detect_cycle = &mesh_detect_cycle;
 261         comm_base_timept(w->base, &w->env->now, &w->env->now_tv);
 262         return w;
 263 }
 264
 265 struct libworker* libworker_create_event(struct ub_ctx* ctx,
 266         struct ub_event_base* eb)
 267 {
 268         return libworker_setup(ctx, 0, eb);
 269 }
 270
 271 /** handle cancel command for bg worker */
 272 static void
 273 handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len)
 274 {
 275         struct ctx_query* q;
 276         if(w->is_bg_thread) {
 277                 lock_basic_lock(&w->ctx->cfglock);
 278                 q = context_deserialize_cancel(w->ctx, buf, len);
 279                 lock_basic_unlock(&w->ctx->cfglock);
 280         } else {
 281                 q = context_deserialize_cancel(w->ctx, buf, len);
 282         }
 283         if(!q) {
 284                 /* probably simply lookup failed, i.e. the message had been
 285                  * processed and answered before the cancel arrived */
 286                 return;
 287         }
 288         q->cancelled = 1;
 289         free(buf);
 290 }
 291
 292 /** do control command coming into bg server */
 293 static void
 294 libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len)
 295 {
 296         switch(context_serial_getcmd(msg, len)) {
 297                 default:
 298                 case UB_LIBCMD_ANSWER:
 299                         log_err("unknown command for bg worker %d",
 300                                 (int)context_serial_getcmd(msg, len));
 301                         /* and fall through to quit */
 302                         /* fallthrough */
 303                 case UB_LIBCMD_QUIT:
 304                         free(msg);
 305                         comm_base_exit(w->base);
 306                         break;
 307                 case UB_LIBCMD_NEWQUERY:
 308                         handle_newq(w, msg, len);
 309                         break;
 310                 case UB_LIBCMD_CANCEL:
 311                         handle_cancel(w, msg, len);
 312                         break;
 313         }
 314 }
 315
 316 /** handle control command coming into server */
 317 void
 318 libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 319         uint8_t* msg, size_t len, int err, void* arg)
 320 {
 321         struct libworker* w = (struct libworker*)arg;
 322
 323         if(err != 0) {
 324                 free(msg);
 325                 /* it is of no use to go on, exit */
 326                 comm_base_exit(w->base);
 327                 return;
 328         }
 329         libworker_do_cmd(w, msg, len); /* also frees the buf */
 330 }
 331
 332 /** the background thread func */
 333 static void*
 334 libworker_dobg(void* arg)
 335 {
 336         /* setup */
 337         uint32_t m;
 338         struct libworker* w = (struct libworker*)arg;
 339         struct ub_ctx* ctx;
 340         if(!w) {
 341                 log_err("libunbound bg worker init failed, nomem");
 342                 return NULL;
 343         }
 344         ctx = w->ctx;
 345         log_thread_set(&w->thread_num);
 346 #ifdef THREADS_DISABLED
 347         /* we are forked */
 348         w->is_bg_thread = 0;
 349         /* close non-used parts of the pipes */
 350         tube_close_write(ctx->qq_pipe);
 351         tube_close_read(ctx->rr_pipe);
 352 #endif
 353         if(!tube_setup_bg_listen(ctx->qq_pipe, w->base,
 354                 libworker_handle_control_cmd, w)) {
 355                 log_err("libunbound bg worker init failed, no bglisten");
 356                 return NULL;
 357         }
 358         if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) {
 359                 log_err("libunbound bg worker init failed, no bgwrite");
 360                 return NULL;
 361         }
 362
 363         /* do the work */
 364         comm_base_dispatch(w->base);
 365
 366         /* cleanup */
 367         m = UB_LIBCMD_QUIT;
 368         w->want_quit = 1;
 369         tube_remove_bg_listen(w->ctx->qq_pipe);
 370         tube_remove_bg_write(w->ctx->rr_pipe);
 371         libworker_delete(w);
 372         (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m,
 373                 (uint32_t)sizeof(m), 0);
 374 #ifdef THREADS_DISABLED
 375         /* close pipes from forked process before exit */
 376         tube_close_read(ctx->qq_pipe);
 377         tube_close_write(ctx->rr_pipe);
 378 #endif
 379         return NULL;
 380 }
 381
 382 int libworker_bg(struct ub_ctx* ctx)
 383 {
 384         struct libworker* w;
 385         /* fork or threadcreate */
 386         lock_basic_lock(&ctx->cfglock);
 387         if(ctx->dothread) {
 388                 lock_basic_unlock(&ctx->cfglock);
 389                 w = libworker_setup(ctx, 1, NULL);
 390                 if(!w) return UB_NOMEM;
 391                 w->is_bg_thread = 1;
 392 #ifdef ENABLE_LOCK_CHECKS
 393                 w->thread_num = 1; /* for nicer DEBUG checklocks */
 394 #endif
 395                 ub_thread_create(&ctx->bg_tid, libworker_dobg, w);
 396         } else {
 397                 lock_basic_unlock(&ctx->cfglock);
 398 #ifndef HAVE_FORK
 399                 /* no fork on windows */
 400                 return UB_FORKFAIL;
 401 #else /* HAVE_FORK */
 402                 switch((ctx->bg_pid=fork())) {
 403                         case 0:
 404                                 w = libworker_setup(ctx, 1, NULL);
 405                                 if(!w) fatal_exit("out of memory");
 406                                 /* close non-used parts of the pipes */
 407                                 tube_close_write(ctx->qq_pipe);
 408                                 tube_close_read(ctx->rr_pipe);
 409                                 (void)libworker_dobg(w);
 410                                 exit(0);
 411                                 break;
 412                         case -1:
 413                                 return UB_FORKFAIL;
 414                         default:
 415                                 /* close non-used parts, so that the worker
 416                                  * bgprocess gets 'pipe closed' when the
 417                                  * main process exits */
 418                                 tube_close_read(ctx->qq_pipe);
 419                                 tube_close_write(ctx->rr_pipe);
 420                                 break;
 421                 }
 422 #endif /* HAVE_FORK */
 423         }
 424         return UB_NOERROR;
 425 }
 426
 427 /** insert canonname */
 428 static int
 429 fill_canon(struct ub_result* res, uint8_t* s)
 430 {
 431         char buf[255+2];
 432         dname_str(s, buf);
 433         res->canonname = strdup(buf);
 434         return res->canonname != 0;
 435 }
 436
 437 /** fill data into result */
 438 static int
 439 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer,
 440         uint8_t* finalcname, struct query_info* rq, struct reply_info* rep)
 441 {
 442         size_t i;
 443         struct packed_rrset_data* data;
 444         res->ttl = 0;
 445         if(!answer) {
 446                 if(finalcname) {
 447                         if(!fill_canon(res, finalcname))
 448                                 return 0; /* out of memory */
 449                 }
 450                 if(rep->rrset_count != 0)
 451                         res->ttl = (int)rep->ttl;
 452                 res->data = (char**)calloc(1, sizeof(char*));
 453                 res->len = (int*)calloc(1, sizeof(int));
 454                 return (res->data && res->len);
 455         }
 456         data = (struct packed_rrset_data*)answer->entry.data;
 457         if(query_dname_compare(rq->qname, answer->rk.dname) != 0) {
 458                 if(!fill_canon(res, answer->rk.dname))
 459                         return 0; /* out of memory */
 460         } else  res->canonname = NULL;
 461         res->data = (char**)calloc(data->count+1, sizeof(char*));
 462         res->len = (int*)calloc(data->count+1, sizeof(int));
 463         if(!res->data || !res->len)
 464                 return 0; /* out of memory */
 465         for(i=0; i<data->count; i++) {
 466                 /* remove rdlength from rdata */
 467                 res->len[i] = (int)(data->rr_len[i] - 2);
 468                 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]);
 469                 if(!res->data[i])
 470                         return 0; /* out of memory */
 471         }
 472         /* ttl for positive answers, from CNAME and answer RRs */
 473         if(data->count != 0) {
 474                 size_t j;
 475                 res->ttl = (int)data->ttl;
 476                 for(j=0; j<rep->an_numrrsets; j++) {
 477                         struct packed_rrset_data* d =
 478                                 (struct packed_rrset_data*)rep->rrsets[j]->
 479                                 entry.data;
 480                         if((int)d->ttl < res->ttl)
 481                                 res->ttl = (int)d->ttl;
 482                 }
 483         }
 484         /* ttl for negative answers */
 485         if(data->count == 0 && rep->rrset_count != 0)
 486                 res->ttl = (int)rep->ttl;
 487         res->data[data->count] = NULL;
 488         res->len[data->count] = 0;
 489         return 1;
 490 }
 491
 492 /** fill result from parsed message, on error fills servfail */
 493 void
 494 libworker_enter_result(struct ub_result* res, sldns_buffer* buf,
 495         struct regional* temp, enum sec_status msg_security)
 496 {
 497         struct query_info rq;
 498         struct reply_info* rep;
 499         res->rcode = LDNS_RCODE_SERVFAIL;
 500         rep = parse_reply_in_temp_region(buf, temp, &rq);
 501         if(!rep) {
 502                 log_err("cannot parse buf");
 503                 return; /* error parsing buf, or out of memory */
 504         }
 505         if(!fill_res(res, reply_find_answer_rrset(&rq, rep),
 506                 reply_find_final_cname_target(&rq, rep), &rq, rep))
 507                 return; /* out of memory */
 508         /* rcode, havedata, nxdomain, secure, bogus */
 509         res->rcode = (int)FLAGS_GET_RCODE(rep->flags);
 510         if(res->data && res->data[0])
 511                 res->havedata = 1;
 512         if(res->rcode == LDNS_RCODE_NXDOMAIN)
 513                 res->nxdomain = 1;
 514         if(msg_security == sec_status_secure)
 515                 res->secure = 1;
 516         if(msg_security == sec_status_bogus ||
 517                 msg_security == sec_status_secure_sentinel_fail)
 518                 res->bogus = 1;
 519 }
 520
 521 /** fillup fg results */
 522 static void
 523 libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf,
 524         enum sec_status s, char* why_bogus, int was_ratelimited)
 525 {
 526         q->res->was_ratelimited = was_ratelimited;
 527         if(why_bogus)
 528                 q->res->why_bogus = strdup(why_bogus);
 529         if(rcode != 0) {
 530                 q->res->rcode = rcode;
 531                 q->msg_security = s;
 532                 return;
 533         }
 534
 535         q->res->rcode = LDNS_RCODE_SERVFAIL;
 536         q->msg_security = 0;
 537         q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf));
 538         q->msg_len = sldns_buffer_limit(buf);
 539         if(!q->msg) {
 540                 return; /* the error is in the rcode */
 541         }
 542
 543         /* canonname and results */
 544         q->msg_security = s;
 545         libworker_enter_result(q->res, buf, q->w->env->scratch, s);
 546 }
 547
 548 void
 549 libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 550         char* why_bogus, int was_ratelimited)
 551 {
 552         struct ctx_query* q = (struct ctx_query*)arg;
 553         /* fg query is done; exit comm base */
 554         comm_base_exit(q->w->base);
 555
 556         libworker_fillup_fg(q, rcode, buf, s, why_bogus, was_ratelimited);
 557 }
 558
 559 /** setup qinfo and edns */
 560 static int
 561 setup_qinfo_edns(struct libworker* w, struct ctx_query* q,
 562         struct query_info* qinfo, struct edns_data* edns)
 563 {
 564         qinfo->qtype = (uint16_t)q->res->qtype;
 565         qinfo->qclass = (uint16_t)q->res->qclass;
 566         qinfo->local_alias = NULL;
 567         qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len);
 568         if(!qinfo->qname) {
 569                 return 0;
 570         }
 571         qinfo->local_alias = NULL;
 572         edns->edns_present = 1;
 573         edns->ext_rcode = 0;
 574         edns->edns_version = 0;
 575         edns->bits = EDNS_DO;
 576         edns->opt_list = NULL;
 577         if(sldns_buffer_capacity(w->back->udp_buff) < 65535)
 578                 edns->udp_size = (uint16_t)sldns_buffer_capacity(
 579                         w->back->udp_buff);
 580         else    edns->udp_size = 65535;
 581         return 1;
 582 }
 583
 584 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)
 585 {
 586         struct libworker* w = libworker_setup(ctx, 0, NULL);
 587         uint16_t qflags, qid;
 588         struct query_info qinfo;
 589         struct edns_data edns;
 590         if(!w)
 591                 return UB_INITFAIL;
 592         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 593                 libworker_delete(w);
 594                 return UB_SYNTAX;
 595         }
 596         qid = 0;
 597         qflags = BIT_RD;
 598         q->w = w;
 599         /* see if there is a fixed answer */
 600         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 601         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 602         if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns,
 603                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 604                 NULL, 0, NULL, 0, NULL)) {
 605                 regional_free_all(w->env->scratch);
 606                 libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
 607                         w->back->udp_buff, sec_status_insecure, NULL, 0);
 608                 libworker_delete(w);
 609                 free(qinfo.qname);
 610                 return UB_NOERROR;
 611         }
 612         if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones,
 613                 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) {
 614                 regional_free_all(w->env->scratch);
 615                 libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
 616                         w->back->udp_buff, sec_status_insecure, NULL, 0);
 617                 libworker_delete(w);
 618                 free(qinfo.qname);
 619                 return UB_NOERROR;
 620         }
 621         /* process new query */
 622         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 623                 w->back->udp_buff, qid, libworker_fg_done_cb, q)) {
 624                 free(qinfo.qname);
 625                 return UB_NOMEM;
 626         }
 627         free(qinfo.qname);
 628
 629         /* wait for reply */
 630         comm_base_dispatch(w->base);
 631
 632         libworker_delete(w);
 633         return UB_NOERROR;
 634 }
 635
 636 void
 637 libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf,
 638         enum sec_status s, char* why_bogus, int was_ratelimited)
 639 {
 640         struct ctx_query* q = (struct ctx_query*)arg;
 641         ub_event_callback_type cb = q->cb_event;
 642         void* cb_arg = q->cb_arg;
 643         int cancelled = q->cancelled;
 644
 645         /* delete it now */
 646         struct ub_ctx* ctx = q->w->ctx;
 647         lock_basic_lock(&ctx->cfglock);
 648         (void)rbtree_delete(&ctx->queries, q->node.key);
 649         ctx->num_async--;
 650         context_query_delete(q);
 651         lock_basic_unlock(&ctx->cfglock);
 652
 653         if(!cancelled) {
 654                 /* call callback */
 655                 int sec = 0;
 656                 if(s == sec_status_bogus)
 657                         sec = 1;
 658                 else if(s == sec_status_secure)
 659                         sec = 2;
 660                 (*cb)(cb_arg, rcode, (void*)sldns_buffer_begin(buf),
 661                         (int)sldns_buffer_limit(buf), sec, why_bogus, was_ratelimited);
 662         }
 663 }
 664
 665 int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,
 666         int* async_id)
 667 {
 668         struct libworker* w = ctx->event_worker;
 669         uint16_t qflags, qid;
 670         struct query_info qinfo;
 671         struct edns_data edns;
 672         if(!w)
 673                 return UB_INITFAIL;
 674         if(!setup_qinfo_edns(w, q, &qinfo, &edns))
 675                 return UB_SYNTAX;
 676         qid = 0;
 677         qflags = BIT_RD;
 678         q->w = w;
 679         /* see if there is a fixed answer */
 680         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 681         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 682         if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns,
 683                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 684                 NULL, 0, NULL, 0, NULL)) {
 685                 regional_free_all(w->env->scratch);
 686                 free(qinfo.qname);
 687                 libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
 688                         w->back->udp_buff, sec_status_insecure, NULL, 0);
 689                 return UB_NOERROR;
 690         }
 691         if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones,
 692                 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) {
 693                 regional_free_all(w->env->scratch);
 694                 free(qinfo.qname);
 695                 libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
 696                         w->back->udp_buff, sec_status_insecure, NULL, 0);
 697                 return UB_NOERROR;
 698         }
 699         /* process new query */
 700         if(async_id)
 701                 *async_id = q->querynum;
 702         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 703                 w->back->udp_buff, qid, libworker_event_done_cb, q)) {
 704                 free(qinfo.qname);
 705                 return UB_NOMEM;
 706         }
 707         free(qinfo.qname);
 708         return UB_NOERROR;
 709 }
 710
 711 /** add result to the bg worker result queue */
 712 static void
 713 add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt,
 714         int err, char* reason, int was_ratelimited)
 715 {
 716         uint8_t* msg = NULL;
 717         uint32_t len = 0;
 718
 719         if(w->want_quit) {
 720                 context_query_delete(q);
 721                 return;
 722         }
 723         /* serialize and delete unneeded q */
 724         if(w->is_bg_thread) {
 725                 lock_basic_lock(&w->ctx->cfglock);
 726                 if(reason)
 727                         q->res->why_bogus = strdup(reason);
 728                 q->res->was_ratelimited = was_ratelimited;
 729                 if(pkt) {
 730                         q->msg_len = sldns_buffer_remaining(pkt);
 731                         q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len);
 732                         if(!q->msg) {
 733                                 msg = context_serialize_answer(q, UB_NOMEM, NULL, &len);
 734                         } else {
 735                                 msg = context_serialize_answer(q, err, NULL, &len);
 736                         }
 737                 } else {
 738                         msg = context_serialize_answer(q, err, NULL, &len);
 739                 }
 740                 lock_basic_unlock(&w->ctx->cfglock);
 741         } else {
 742                 if(reason)
 743                         q->res->why_bogus = strdup(reason);
 744                 q->res->was_ratelimited = was_ratelimited;
 745                 msg = context_serialize_answer(q, err, pkt, &len);
 746                 (void)rbtree_delete(&w->ctx->queries, q->node.key);
 747                 w->ctx->num_async--;
 748                 context_query_delete(q);
 749         }
 750
 751         if(!msg) {
 752                 log_err("out of memory for async answer");
 753                 return;
 754         }
 755         if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) {
 756                 log_err("out of memory for async answer");
 757                 return;
 758         }
 759 }
 760
 761 void
 762 libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 763         char* why_bogus, int was_ratelimited)
 764 {
 765         struct ctx_query* q = (struct ctx_query*)arg;
 766
 767         if(q->cancelled || q->w->back->want_to_quit) {
 768                 if(q->w->is_bg_thread) {
 769                         /* delete it now */
 770                         struct ub_ctx* ctx = q->w->ctx;
 771                         lock_basic_lock(&ctx->cfglock);
 772                         (void)rbtree_delete(&ctx->queries, q->node.key);
 773                         ctx->num_async--;
 774                         context_query_delete(q);
 775                         lock_basic_unlock(&ctx->cfglock);
 776                 }
 777                 /* cancelled, do not give answer */
 778                 return;
 779         }
 780         q->msg_security = s;
 781         if(!buf) {
 782                 buf = q->w->env->scratch_buffer;
 783         }
 784         if(rcode != 0) {
 785                 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL);
 786         }
 787         add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus, was_ratelimited);
 788 }
 789
 790
 791 /** handle new query command for bg worker */
 792 static void
 793 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len)
 794 {
 795         uint16_t qflags, qid;
 796         struct query_info qinfo;
 797         struct edns_data edns;
 798         struct ctx_query* q;
 799         if(w->is_bg_thread) {
 800                 lock_basic_lock(&w->ctx->cfglock);
 801                 q = context_lookup_new_query(w->ctx, buf, len);
 802                 lock_basic_unlock(&w->ctx->cfglock);
 803         } else {
 804                 q = context_deserialize_new_query(w->ctx, buf, len);
 805         }
 806         free(buf);
 807         if(!q) {
 808                 log_err("failed to deserialize newq");
 809                 return;
 810         }
 811         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 812                 add_bg_result(w, q, NULL, UB_SYNTAX, NULL, 0);
 813                 return;
 814         }
 815         qid = 0;
 816         qflags = BIT_RD;
 817         /* see if there is a fixed answer */
 818         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 819         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 820         if(local_zones_answer(w->ctx->local_zones, w->env, &qinfo, &edns,
 821                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 822                 NULL, 0, NULL, 0, NULL)) {
 823                 regional_free_all(w->env->scratch);
 824                 q->msg_security = sec_status_insecure;
 825                 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL, 0);
 826                 free(qinfo.qname);
 827                 return;
 828         }
 829         if(w->ctx->env->auth_zones && auth_zones_answer(w->ctx->env->auth_zones,
 830                 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) {
 831                 regional_free_all(w->env->scratch);
 832                 q->msg_security = sec_status_insecure;
 833                 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL, 0);
 834                 free(qinfo.qname);
 835                 return;
 836         }
 837         q->w = w;
 838         /* process new query */
 839         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 840                 w->back->udp_buff, qid, libworker_bg_done_cb, q)) {
 841                 add_bg_result(w, q, NULL, UB_NOMEM, NULL, 0);
 842         }
 843         free(qinfo.qname);
 844 }
 845
 846 void libworker_alloc_cleanup(void* arg)
 847 {
 848         struct libworker* w = (struct libworker*)arg;
 849         slabhash_clear(&w->env->rrset_cache->table);
 850         slabhash_clear(w->env->msg_cache);
 851 }
 852
 853 struct outbound_entry* libworker_send_query(struct query_info* qinfo,
 854         uint16_t flags, int dnssec, int want_dnssec, int nocaps,
 855         struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
 856         size_t zonelen, int ssl_upstream, char* tls_auth_name,
 857         struct module_qstate* q)
 858 {
 859         struct libworker* w = (struct libworker*)q->env->worker;
 860         struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
 861                 q->region, sizeof(*e));
 862         if(!e)
 863                 return NULL;
 864         e->qstate = q;
 865         e->qsent = outnet_serviced_query(w->back, qinfo, flags, dnssec,
 866                 want_dnssec, nocaps, q->env->cfg->tcp_upstream, ssl_upstream,
 867                 tls_auth_name, addr, addrlen, zone, zonelen, q,
 868                 libworker_handle_service_reply, e, w->back->udp_buff, q->env);
 869         if(!e->qsent) {
 870                 return NULL;
 871         }
 872         return e;
 873 }
 874
 875 int
 876 libworker_handle_reply(struct comm_point* c, void* arg, int error,
 877         struct comm_reply* reply_info)
 878 {
 879         struct module_qstate* q = (struct module_qstate*)arg;
 880         struct libworker* lw = (struct libworker*)q->env->worker;
 881         struct outbound_entry e;
 882         e.qstate = q;
 883         e.qsent = NULL;
 884
 885         if(error != 0) {
 886                 mesh_report_reply(lw->env->mesh, &e, reply_info, error);
 887                 return 0;
 888         }
 889         /* sanity check. */
 890         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 891                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 892                         LDNS_PACKET_QUERY
 893                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 894                 /* error becomes timeout for the module as if this reply
 895                  * never arrived. */
 896                 mesh_report_reply(lw->env->mesh, &e, reply_info,
 897                         NETEVENT_TIMEOUT);
 898                 return 0;
 899         }
 900         mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR);
 901         return 0;
 902 }
 903
 904 int
 905 libworker_handle_service_reply(struct comm_point* c, void* arg, int error,
 906         struct comm_reply* reply_info)
 907 {
 908         struct outbound_entry* e = (struct outbound_entry*)arg;
 909         struct libworker* lw = (struct libworker*)e->qstate->env->worker;
 910
 911         if(error != 0) {
 912                 mesh_report_reply(lw->env->mesh, e, reply_info, error);
 913                 return 0;
 914         }
 915         /* sanity check. */
 916         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 917                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 918                         LDNS_PACKET_QUERY
 919                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 920                 /* error becomes timeout for the module as if this reply
 921                  * never arrived. */
 922                 mesh_report_reply(lw->env->mesh, e, reply_info,
 923                         NETEVENT_TIMEOUT);
 924                 return 0;
 925         }
 926         mesh_report_reply(lw->env->mesh,  e, reply_info, NETEVENT_NOERROR);
 927         return 0;
 928 }
 929
 930 /* --- fake callbacks for fptr_wlist to work --- */
 931 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 932         uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
 933         int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
 934 {
 935         log_assert(0);
 936 }
 937
 938 int worker_handle_request(struct comm_point* ATTR_UNUSED(c),
 939         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 940         struct comm_reply* ATTR_UNUSED(repinfo))
 941 {
 942         log_assert(0);
 943         return 0;
 944 }
 945
 946 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c),
 947         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 948         struct comm_reply* ATTR_UNUSED(reply_info))
 949 {
 950         log_assert(0);
 951         return 0;
 952 }
 953
 954 int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
 955         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 956         struct comm_reply* ATTR_UNUSED(reply_info))
 957 {
 958         log_assert(0);
 959         return 0;
 960 }
 961
 962 int remote_accept_callback(struct comm_point* ATTR_UNUSED(c),
 963         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 964         struct comm_reply* ATTR_UNUSED(repinfo))
 965 {
 966         log_assert(0);
 967         return 0;
 968 }
 969
 970 int remote_control_callback(struct comm_point* ATTR_UNUSED(c),
 971         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 972         struct comm_reply* ATTR_UNUSED(repinfo))
 973 {
 974         log_assert(0);
 975         return 0;
 976 }
 977
 978 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg))
 979 {
 980         log_assert(0);
 981 }
 982
 983 struct outbound_entry* worker_send_query(struct query_info* ATTR_UNUSED(qinfo),
 984         uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec),
 985         int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps),
 986         struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen),
 987         uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen),
 988         int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name),
 989         struct module_qstate* ATTR_UNUSED(q))
 990 {
 991         log_assert(0);
 992         return 0;
 993 }
 994
 995 void
 996 worker_alloc_cleanup(void* ATTR_UNUSED(arg))
 997 {
 998         log_assert(0);
 999 }
1000
1001 void worker_stat_timer_cb(void* ATTR_UNUSED(arg))
1002 {
1003         log_assert(0);
1004 }
1005
1006 void worker_probe_timer_cb(void* ATTR_UNUSED(arg))
1007 {
1008         log_assert(0);
1009 }
1010
1011 void worker_start_accept(void* ATTR_UNUSED(arg))
1012 {
1013         log_assert(0);
1014 }
1015
1016 void worker_stop_accept(void* ATTR_UNUSED(arg))
1017 {
1018         log_assert(0);
1019 }
1020
1021 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
1022 {
1023         log_assert(0);
1024         return 0;
1025 }
1026
1027 int
1028 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1029 {
1030         log_assert(0);
1031         return 0;
1032 }
1033
1034 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1035 {
1036         log_assert(0);
1037         return 0;
1038 }
1039
1040 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg))
1041 {
1042         log_assert(0);
1043 }
1044
1045 #ifdef UB_ON_WINDOWS
1046 void
1047 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void*
1048         ATTR_UNUSED(arg)) {
1049         log_assert(0);
1050 }
1051
1052 void
1053 wsvc_cron_cb(void* ATTR_UNUSED(arg))
1054 {
1055         log_assert(0);
1056 }
1057 #endif /* UB_ON_WINDOWS */