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) {
 162                 w->sslctx = connect_sslctx_create(NULL, NULL,
 163                         cfg->tls_cert_bundle);
 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         tube_remove_bg_listen(w->ctx->qq_pipe);
 369         tube_remove_bg_write(w->ctx->rr_pipe);
 370         libworker_delete(w);
 371         (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m,
 372                 (uint32_t)sizeof(m), 0);
 373 #ifdef THREADS_DISABLED
 374         /* close pipes from forked process before exit */
 375         tube_close_read(ctx->qq_pipe);
 376         tube_close_write(ctx->rr_pipe);
 377 #endif
 378         return NULL;
 379 }
 380
 381 int libworker_bg(struct ub_ctx* ctx)
 382 {
 383         struct libworker* w;
 384         /* fork or threadcreate */
 385         lock_basic_lock(&ctx->cfglock);
 386         if(ctx->dothread) {
 387                 lock_basic_unlock(&ctx->cfglock);
 388                 w = libworker_setup(ctx, 1, NULL);
 389                 if(!w) return UB_NOMEM;
 390                 w->is_bg_thread = 1;
 391 #ifdef ENABLE_LOCK_CHECKS
 392                 w->thread_num = 1; /* for nicer DEBUG checklocks */
 393 #endif
 394                 ub_thread_create(&ctx->bg_tid, libworker_dobg, w);
 395         } else {
 396                 lock_basic_unlock(&ctx->cfglock);
 397 #ifndef HAVE_FORK
 398                 /* no fork on windows */
 399                 return UB_FORKFAIL;
 400 #else /* HAVE_FORK */
 401                 switch((ctx->bg_pid=fork())) {
 402                         case 0:
 403                                 w = libworker_setup(ctx, 1, NULL);
 404                                 if(!w) fatal_exit("out of memory");
 405                                 /* close non-used parts of the pipes */
 406                                 tube_close_write(ctx->qq_pipe);
 407                                 tube_close_read(ctx->rr_pipe);
 408                                 (void)libworker_dobg(w);
 409                                 exit(0);
 410                                 break;
 411                         case -1:
 412                                 return UB_FORKFAIL;
 413                         default:
 414                                 /* close non-used parts, so that the worker
 415                                  * bgprocess gets 'pipe closed' when the
 416                                  * main process exits */
 417                                 tube_close_read(ctx->qq_pipe);
 418                                 tube_close_write(ctx->rr_pipe);
 419                                 break;
 420                 }
 421 #endif /* HAVE_FORK */
 422         }
 423         return UB_NOERROR;
 424 }
 425
 426 /** insert canonname */
 427 static int
 428 fill_canon(struct ub_result* res, uint8_t* s)
 429 {
 430         char buf[255+2];
 431         dname_str(s, buf);
 432         res->canonname = strdup(buf);
 433         return res->canonname != 0;
 434 }
 435
 436 /** fill data into result */
 437 static int
 438 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer,
 439         uint8_t* finalcname, struct query_info* rq, struct reply_info* rep)
 440 {
 441         size_t i;
 442         struct packed_rrset_data* data;
 443         res->ttl = 0;
 444         if(!answer) {
 445                 if(finalcname) {
 446                         if(!fill_canon(res, finalcname))
 447                                 return 0; /* out of memory */
 448                 }
 449                 if(rep->rrset_count != 0)
 450                         res->ttl = (int)rep->ttl;
 451                 res->data = (char**)calloc(1, sizeof(char*));
 452                 res->len = (int*)calloc(1, sizeof(int));
 453                 return (res->data && res->len);
 454         }
 455         data = (struct packed_rrset_data*)answer->entry.data;
 456         if(query_dname_compare(rq->qname, answer->rk.dname) != 0) {
 457                 if(!fill_canon(res, answer->rk.dname))
 458                         return 0; /* out of memory */
 459         } else  res->canonname = NULL;
 460         res->data = (char**)calloc(data->count+1, sizeof(char*));
 461         res->len = (int*)calloc(data->count+1, sizeof(int));
 462         if(!res->data || !res->len)
 463                 return 0; /* out of memory */
 464         for(i=0; i<data->count; i++) {
 465                 /* remove rdlength from rdata */
 466                 res->len[i] = (int)(data->rr_len[i] - 2);
 467                 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]);
 468                 if(!res->data[i])
 469                         return 0; /* out of memory */
 470         }
 471         /* ttl for positive answers, from CNAME and answer RRs */
 472         if(data->count != 0) {
 473                 size_t j;
 474                 res->ttl = (int)data->ttl;
 475                 for(j=0; j<rep->an_numrrsets; j++) {
 476                         struct packed_rrset_data* d =
 477                                 (struct packed_rrset_data*)rep->rrsets[j]->
 478                                 entry.data;
 479                         if((int)d->ttl < res->ttl)
 480                                 res->ttl = (int)d->ttl;
 481                 }
 482         }
 483         /* ttl for negative answers */
 484         if(data->count == 0 && rep->rrset_count != 0)
 485                 res->ttl = (int)rep->ttl;
 486         res->data[data->count] = NULL;
 487         res->len[data->count] = 0;
 488         return 1;
 489 }
 490
 491 /** fill result from parsed message, on error fills servfail */
 492 void
 493 libworker_enter_result(struct ub_result* res, sldns_buffer* buf,
 494         struct regional* temp, enum sec_status msg_security)
 495 {
 496         struct query_info rq;
 497         struct reply_info* rep;
 498         res->rcode = LDNS_RCODE_SERVFAIL;
 499         rep = parse_reply_in_temp_region(buf, temp, &rq);
 500         if(!rep) {
 501                 log_err("cannot parse buf");
 502                 return; /* error parsing buf, or out of memory */
 503         }
 504         if(!fill_res(res, reply_find_answer_rrset(&rq, rep),
 505                 reply_find_final_cname_target(&rq, rep), &rq, rep))
 506                 return; /* out of memory */
 507         /* rcode, havedata, nxdomain, secure, bogus */
 508         res->rcode = (int)FLAGS_GET_RCODE(rep->flags);
 509         if(res->data && res->data[0])
 510                 res->havedata = 1;
 511         if(res->rcode == LDNS_RCODE_NXDOMAIN)
 512                 res->nxdomain = 1;
 513         if(msg_security == sec_status_secure)
 514                 res->secure = 1;
 515         if(msg_security == sec_status_bogus)
 516                 res->bogus = 1;
 517 }
 518
 519 /** fillup fg results */
 520 static void
 521 libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf,
 522         enum sec_status s, char* why_bogus)
 523 {
 524         if(why_bogus)
 525                 q->res->why_bogus = strdup(why_bogus);
 526         if(rcode != 0) {
 527                 q->res->rcode = rcode;
 528                 q->msg_security = s;
 529                 return;
 530         }
 531
 532         q->res->rcode = LDNS_RCODE_SERVFAIL;
 533         q->msg_security = 0;
 534         q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf));
 535         q->msg_len = sldns_buffer_limit(buf);
 536         if(!q->msg) {
 537                 return; /* the error is in the rcode */
 538         }
 539
 540         /* canonname and results */
 541         q->msg_security = s;
 542         libworker_enter_result(q->res, buf, q->w->env->scratch, s);
 543 }
 544
 545 void
 546 libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 547         char* why_bogus)
 548 {
 549         struct ctx_query* q = (struct ctx_query*)arg;
 550         /* fg query is done; exit comm base */
 551         comm_base_exit(q->w->base);
 552
 553         libworker_fillup_fg(q, rcode, buf, s, why_bogus);
 554 }
 555
 556 /** setup qinfo and edns */
 557 static int
 558 setup_qinfo_edns(struct libworker* w, struct ctx_query* q,
 559         struct query_info* qinfo, struct edns_data* edns)
 560 {
 561         qinfo->qtype = (uint16_t)q->res->qtype;
 562         qinfo->qclass = (uint16_t)q->res->qclass;
 563         qinfo->local_alias = NULL;
 564         qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len);
 565         if(!qinfo->qname) {
 566                 return 0;
 567         }
 568         qinfo->local_alias = NULL;
 569         edns->edns_present = 1;
 570         edns->ext_rcode = 0;
 571         edns->edns_version = 0;
 572         edns->bits = EDNS_DO;
 573         edns->opt_list = NULL;
 574         if(sldns_buffer_capacity(w->back->udp_buff) < 65535)
 575                 edns->udp_size = (uint16_t)sldns_buffer_capacity(
 576                         w->back->udp_buff);
 577         else    edns->udp_size = 65535;
 578         return 1;
 579 }
 580
 581 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)
 582 {
 583         struct libworker* w = libworker_setup(ctx, 0, NULL);
 584         uint16_t qflags, qid;
 585         struct query_info qinfo;
 586         struct edns_data edns;
 587         if(!w)
 588                 return UB_INITFAIL;
 589         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 590                 libworker_delete(w);
 591                 return UB_SYNTAX;
 592         }
 593         qid = 0;
 594         qflags = BIT_RD;
 595         q->w = w;
 596         /* see if there is a fixed answer */
 597         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 598         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 599         if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns,
 600                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 601                 NULL, 0, NULL, 0, NULL)) {
 602                 regional_free_all(w->env->scratch);
 603                 libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
 604                         w->back->udp_buff, sec_status_insecure, NULL);
 605                 libworker_delete(w);
 606                 free(qinfo.qname);
 607                 return UB_NOERROR;
 608         }
 609         if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones,
 610                 w->env, &qinfo, &edns, w->back->udp_buff, w->env->scratch)) {
 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
 633 void
 634 libworker_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_type cb = (ub_event_callback_type)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
 662 int 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, w->env, &qinfo, &edns,
 680                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 681                 NULL, 0, NULL, 0, NULL)) {
 682                 regional_free_all(w->env->scratch);
 683                 free(qinfo.qname);
 684                 libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
 685                         w->back->udp_buff, sec_status_insecure, NULL);
 686                 return UB_NOERROR;
 687         }
 688         if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones,
 689                 w->env, &qinfo, &edns, w->back->udp_buff, w->env->scratch)) {
 690                 regional_free_all(w->env->scratch);
 691                 free(qinfo.qname);
 692                 libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
 693                         w->back->udp_buff, sec_status_insecure, NULL);
 694                 return UB_NOERROR;
 695         }
 696         /* process new query */
 697         if(async_id)
 698                 *async_id = q->querynum;
 699         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 700                 w->back->udp_buff, qid, libworker_event_done_cb, q)) {
 701                 free(qinfo.qname);
 702                 return UB_NOMEM;
 703         }
 704         free(qinfo.qname);
 705         return UB_NOERROR;
 706 }
 707
 708 /** add result to the bg worker result queue */
 709 static void
 710 add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt,
 711         int err, char* reason)
 712 {
 713         uint8_t* msg = NULL;
 714         uint32_t len = 0;
 715
 716         /* serialize and delete unneeded q */
 717         if(w->is_bg_thread) {
 718                 lock_basic_lock(&w->ctx->cfglock);
 719                 if(reason)
 720                         q->res->why_bogus = strdup(reason);
 721                 if(pkt) {
 722                         q->msg_len = sldns_buffer_remaining(pkt);
 723                         q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len);
 724                         if(!q->msg)
 725                                 msg = context_serialize_answer(q, UB_NOMEM,
 726                                 NULL, &len);
 727                         else    msg = context_serialize_answer(q, err,
 728                                 NULL, &len);
 729                 } else msg = context_serialize_answer(q, err, NULL, &len);
 730                 lock_basic_unlock(&w->ctx->cfglock);
 731         } else {
 732                 if(reason)
 733                         q->res->why_bogus = strdup(reason);
 734                 msg = context_serialize_answer(q, err, pkt, &len);
 735                 (void)rbtree_delete(&w->ctx->queries, q->node.key);
 736                 w->ctx->num_async--;
 737                 context_query_delete(q);
 738         }
 739
 740         if(!msg) {
 741                 log_err("out of memory for async answer");
 742                 return;
 743         }
 744         if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) {
 745                 log_err("out of memory for async answer");
 746                 return;
 747         }
 748 }
 749
 750 void
 751 libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 752         char* why_bogus)
 753 {
 754         struct ctx_query* q = (struct ctx_query*)arg;
 755
 756         if(q->cancelled || q->w->back->want_to_quit) {
 757                 if(q->w->is_bg_thread) {
 758                         /* delete it now */
 759                         struct ub_ctx* ctx = q->w->ctx;
 760                         lock_basic_lock(&ctx->cfglock);
 761                         (void)rbtree_delete(&ctx->queries, q->node.key);
 762                         ctx->num_async--;
 763                         context_query_delete(q);
 764                         lock_basic_unlock(&ctx->cfglock);
 765                 }
 766                 /* cancelled, do not give answer */
 767                 return;
 768         }
 769         q->msg_security = s;
 770         if(!buf)
 771                 buf = q->w->env->scratch_buffer;
 772         if(rcode != 0) {
 773                 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL);
 774         }
 775         add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus);
 776 }
 777
 778
 779 /** handle new query command for bg worker */
 780 static void
 781 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len)
 782 {
 783         uint16_t qflags, qid;
 784         struct query_info qinfo;
 785         struct edns_data edns;
 786         struct ctx_query* q;
 787         if(w->is_bg_thread) {
 788                 lock_basic_lock(&w->ctx->cfglock);
 789                 q = context_lookup_new_query(w->ctx, buf, len);
 790                 lock_basic_unlock(&w->ctx->cfglock);
 791         } else {
 792                 q = context_deserialize_new_query(w->ctx, buf, len);
 793         }
 794         free(buf);
 795         if(!q) {
 796                 log_err("failed to deserialize newq");
 797                 return;
 798         }
 799         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 800                 add_bg_result(w, q, NULL, UB_SYNTAX, NULL);
 801                 return;
 802         }
 803         qid = 0;
 804         qflags = BIT_RD;
 805         /* see if there is a fixed answer */
 806         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 807         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 808         if(local_zones_answer(w->ctx->local_zones, w->env, &qinfo, &edns,
 809                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 810                 NULL, 0, NULL, 0, NULL)) {
 811                 regional_free_all(w->env->scratch);
 812                 q->msg_security = sec_status_insecure;
 813                 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL);
 814                 free(qinfo.qname);
 815                 return;
 816         }
 817         if(w->ctx->env->auth_zones && auth_zones_answer(w->ctx->env->auth_zones,
 818                 w->env, &qinfo, &edns, w->back->udp_buff, w->env->scratch)) {
 819                 regional_free_all(w->env->scratch);
 820                 q->msg_security = sec_status_insecure;
 821                 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL);
 822                 free(qinfo.qname);
 823                 return;
 824         }
 825         q->w = w;
 826         /* process new query */
 827         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 828                 w->back->udp_buff, qid, libworker_bg_done_cb, q)) {
 829                 add_bg_result(w, q, NULL, UB_NOMEM, NULL);
 830         }
 831         free(qinfo.qname);
 832 }
 833
 834 void libworker_alloc_cleanup(void* arg)
 835 {
 836         struct libworker* w = (struct libworker*)arg;
 837         slabhash_clear(&w->env->rrset_cache->table);
 838         slabhash_clear(w->env->msg_cache);
 839 }
 840
 841 struct outbound_entry* libworker_send_query(struct query_info* qinfo,
 842         uint16_t flags, int dnssec, int want_dnssec, int nocaps,
 843         struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
 844         size_t zonelen, int ssl_upstream, struct module_qstate* q)
 845 {
 846         struct libworker* w = (struct libworker*)q->env->worker;
 847         struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
 848                 q->region, sizeof(*e));
 849         if(!e)
 850                 return NULL;
 851         e->qstate = q;
 852         e->qsent = outnet_serviced_query(w->back, qinfo, flags, dnssec,
 853                 want_dnssec, nocaps, q->env->cfg->tcp_upstream, ssl_upstream,
 854                 addr, addrlen, zone, zonelen, q, libworker_handle_service_reply,
 855                 e, w->back->udp_buff, q->env);
 856         if(!e->qsent) {
 857                 return NULL;
 858         }
 859         return e;
 860 }
 861
 862 int
 863 libworker_handle_reply(struct comm_point* c, void* arg, int error,
 864         struct comm_reply* reply_info)
 865 {
 866         struct module_qstate* q = (struct module_qstate*)arg;
 867         struct libworker* lw = (struct libworker*)q->env->worker;
 868         struct outbound_entry e;
 869         e.qstate = q;
 870         e.qsent = NULL;
 871
 872         if(error != 0) {
 873                 mesh_report_reply(lw->env->mesh, &e, reply_info, error);
 874                 return 0;
 875         }
 876         /* sanity check. */
 877         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 878                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 879                         LDNS_PACKET_QUERY
 880                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 881                 /* error becomes timeout for the module as if this reply
 882                  * never arrived. */
 883                 mesh_report_reply(lw->env->mesh, &e, reply_info,
 884                         NETEVENT_TIMEOUT);
 885                 return 0;
 886         }
 887         mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR);
 888         return 0;
 889 }
 890
 891 int
 892 libworker_handle_service_reply(struct comm_point* c, void* arg, int error,
 893         struct comm_reply* reply_info)
 894 {
 895         struct outbound_entry* e = (struct outbound_entry*)arg;
 896         struct libworker* lw = (struct libworker*)e->qstate->env->worker;
 897
 898         if(error != 0) {
 899                 mesh_report_reply(lw->env->mesh, e, reply_info, error);
 900                 return 0;
 901         }
 902         /* sanity check. */
 903         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 904                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 905                         LDNS_PACKET_QUERY
 906                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 907                 /* error becomes timeout for the module as if this reply
 908                  * never arrived. */
 909                 mesh_report_reply(lw->env->mesh, e, reply_info,
 910                         NETEVENT_TIMEOUT);
 911                 return 0;
 912         }
 913         mesh_report_reply(lw->env->mesh,  e, reply_info, NETEVENT_NOERROR);
 914         return 0;
 915 }
 916
 917 /* --- fake callbacks for fptr_wlist to work --- */
 918 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 919         uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
 920         int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
 921 {
 922         log_assert(0);
 923 }
 924
 925 int worker_handle_request(struct comm_point* ATTR_UNUSED(c),
 926         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 927         struct comm_reply* ATTR_UNUSED(repinfo))
 928 {
 929         log_assert(0);
 930         return 0;
 931 }
 932
 933 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c),
 934         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 935         struct comm_reply* ATTR_UNUSED(reply_info))
 936 {
 937         log_assert(0);
 938         return 0;
 939 }
 940
 941 int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
 942         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 943         struct comm_reply* ATTR_UNUSED(reply_info))
 944 {
 945         log_assert(0);
 946         return 0;
 947 }
 948
 949 int remote_accept_callback(struct comm_point* ATTR_UNUSED(c),
 950         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 951         struct comm_reply* ATTR_UNUSED(repinfo))
 952 {
 953         log_assert(0);
 954         return 0;
 955 }
 956
 957 int remote_control_callback(struct comm_point* ATTR_UNUSED(c),
 958         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 959         struct comm_reply* ATTR_UNUSED(repinfo))
 960 {
 961         log_assert(0);
 962         return 0;
 963 }
 964
 965 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg))
 966 {
 967         log_assert(0);
 968 }
 969
 970 struct outbound_entry* worker_send_query(struct query_info* ATTR_UNUSED(qinfo),
 971         uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec),
 972         int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps),
 973         struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen),
 974         uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen),
 975         int ATTR_UNUSED(ssl_upstream), struct module_qstate* ATTR_UNUSED(q))
 976 {
 977         log_assert(0);
 978         return 0;
 979 }
 980
 981 void
 982 worker_alloc_cleanup(void* ATTR_UNUSED(arg))
 983 {
 984         log_assert(0);
 985 }
 986
 987 void worker_stat_timer_cb(void* ATTR_UNUSED(arg))
 988 {
 989         log_assert(0);
 990 }
 991
 992 void worker_probe_timer_cb(void* ATTR_UNUSED(arg))
 993 {
 994         log_assert(0);
 995 }
 996
 997 void worker_start_accept(void* ATTR_UNUSED(arg))
 998 {
 999         log_assert(0);
1000 }
1001
1002 void worker_stop_accept(void* ATTR_UNUSED(arg))
1003 {
1004         log_assert(0);
1005 }
1006
1007 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
1008 {
1009         log_assert(0);
1010         return 0;
1011 }
1012
1013 int
1014 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1015 {
1016         log_assert(0);
1017         return 0;
1018 }
1019
1020 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1021 {
1022         log_assert(0);
1023         return 0;
1024 }
1025
1026 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg))
1027 {
1028         log_assert(0);
1029 }
1030
1031 #ifdef UB_ON_WINDOWS
1032 void
1033 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void*
1034         ATTR_UNUSED(arg)) {
1035         log_assert(0);
1036 }
1037
1038 void
1039 wsvc_cron_cb(void* ATTR_UNUSED(arg))
1040 {
1041         log_assert(0);
1042 }
1043 #endif /* UB_ON_WINDOWS */