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         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 || (cfg->tls_cert_bundle && cfg->tls_cert_bundle[0]) || cfg->tls_win_cert) {
 161                 w->sslctx = connect_sslctx_create(NULL, NULL,
 162                         cfg->tls_cert_bundle, cfg->tls_win_cert);
 163                 if(!w->sslctx) {
 164                         /* to make the setup fail after unlock */
 165                         hints_delete(w->env->hints);
 166                         w->env->hints = NULL;
 167                 }
 168         }
 169         if(!w->is_bg || w->is_bg_thread) {
 170                 lock_basic_unlock(&ctx->cfglock);
 171         }
 172         if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds ||
 173                 !w->env->hints) {
 174                 libworker_delete(w);
 175                 return NULL;
 176         }
 177         w->env->worker = (struct worker*)w;
 178         w->env->probe_timer = NULL;
 179         if(!w->is_bg || w->is_bg_thread) {
 180                 lock_basic_lock(&ctx->cfglock);
 181         }
 182         if(!(w->env->rnd = ub_initstate(ctx->seed_rnd))) {
 183                 if(!w->is_bg || w->is_bg_thread) {
 184                         lock_basic_unlock(&ctx->cfglock);
 185                 }
 186                 libworker_delete(w);
 187                 return NULL;
 188         }
 189         if(!w->is_bg || w->is_bg_thread) {
 190                 lock_basic_unlock(&ctx->cfglock);
 191         }
 192         if(1) {
 193                 /* primitive lockout for threading: if it overwrites another
 194                  * thread it is like wiping the cache (which is likely empty
 195                  * at the start) */
 196                 /* note we are holding the ctx lock in normal threaded
 197                  * cases so that is solved properly, it is only for many ctx
 198                  * in different threads that this may clash */
 199                 static int done_raninit = 0;
 200                 if(!done_raninit) {
 201                         done_raninit = 1;
 202                         hash_set_raninit((uint32_t)ub_random(w->env->rnd));
 203                 }
 204         }
 205
 206         if(eb)
 207                 w->base = comm_base_create_event(eb);
 208         else    w->base = comm_base_create(0);
 209         if(!w->base) {
 210                 libworker_delete(w);
 211                 return NULL;
 212         }
 213         w->env->worker_base = w->base;
 214         if(!w->is_bg || w->is_bg_thread) {
 215                 lock_basic_lock(&ctx->cfglock);
 216         }
 217         numports = cfg_condense_ports(cfg, &ports);
 218         if(numports == 0) {
 219                 if(!w->is_bg || w->is_bg_thread) {
 220                         lock_basic_unlock(&ctx->cfglock);
 221                 }
 222                 libworker_delete(w);
 223                 return NULL;
 224         }
 225         w->back = outside_network_create(w->base, cfg->msg_buffer_size,
 226                 (size_t)cfg->outgoing_num_ports, cfg->out_ifs,
 227                 cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6,
 228                 cfg->do_tcp?cfg->outgoing_num_tcp:0,
 229                 w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id,
 230                 ports, numports, cfg->unwanted_threshold,
 231                 cfg->outgoing_tcp_mss, &libworker_alloc_cleanup, w,
 232                 cfg->do_udp || cfg->udp_upstream_without_downstream, w->sslctx,
 233                 cfg->delay_close, NULL);
 234         w->env->outnet = w->back;
 235         if(!w->is_bg || w->is_bg_thread) {
 236                 lock_basic_unlock(&ctx->cfglock);
 237         }
 238         free(ports);
 239         if(!w->back) {
 240                 libworker_delete(w);
 241                 return NULL;
 242         }
 243         w->env->mesh = mesh_create(&ctx->mods, w->env);
 244         if(!w->env->mesh) {
 245                 libworker_delete(w);
 246                 return NULL;
 247         }
 248         w->env->send_query = &libworker_send_query;
 249         w->env->detach_subs = &mesh_detach_subs;
 250         w->env->attach_sub = &mesh_attach_sub;
 251         w->env->add_sub = &mesh_add_sub;
 252         w->env->kill_sub = &mesh_state_delete;
 253         w->env->detect_cycle = &mesh_detect_cycle;
 254         comm_base_timept(w->base, &w->env->now, &w->env->now_tv);
 255         return w;
 256 }
 257
 258 struct libworker* libworker_create_event(struct ub_ctx* ctx,
 259         struct ub_event_base* eb)
 260 {
 261         return libworker_setup(ctx, 0, eb);
 262 }
 263
 264 /** handle cancel command for bg worker */
 265 static void
 266 handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len)
 267 {
 268         struct ctx_query* q;
 269         if(w->is_bg_thread) {
 270                 lock_basic_lock(&w->ctx->cfglock);
 271                 q = context_deserialize_cancel(w->ctx, buf, len);
 272                 lock_basic_unlock(&w->ctx->cfglock);
 273         } else {
 274                 q = context_deserialize_cancel(w->ctx, buf, len);
 275         }
 276         if(!q) {
 277                 /* probably simply lookup failed, i.e. the message had been
 278                  * processed and answered before the cancel arrived */
 279                 return;
 280         }
 281         q->cancelled = 1;
 282         free(buf);
 283 }
 284
 285 /** do control command coming into bg server */
 286 static void
 287 libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len)
 288 {
 289         switch(context_serial_getcmd(msg, len)) {
 290                 default:
 291                 case UB_LIBCMD_ANSWER:
 292                         log_err("unknown command for bg worker %d",
 293                                 (int)context_serial_getcmd(msg, len));
 294                         /* and fall through to quit */
 295                         /* fallthrough */
 296                 case UB_LIBCMD_QUIT:
 297                         free(msg);
 298                         comm_base_exit(w->base);
 299                         break;
 300                 case UB_LIBCMD_NEWQUERY:
 301                         handle_newq(w, msg, len);
 302                         break;
 303                 case UB_LIBCMD_CANCEL:
 304                         handle_cancel(w, msg, len);
 305                         break;
 306         }
 307 }
 308
 309 /** handle control command coming into server */
 310 void
 311 libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 312         uint8_t* msg, size_t len, int err, void* arg)
 313 {
 314         struct libworker* w = (struct libworker*)arg;
 315
 316         if(err != 0) {
 317                 free(msg);
 318                 /* it is of no use to go on, exit */
 319                 comm_base_exit(w->base);
 320                 return;
 321         }
 322         libworker_do_cmd(w, msg, len); /* also frees the buf */
 323 }
 324
 325 /** the background thread func */
 326 static void*
 327 libworker_dobg(void* arg)
 328 {
 329         /* setup */
 330         uint32_t m;
 331         struct libworker* w = (struct libworker*)arg;
 332         struct ub_ctx* ctx;
 333         if(!w) {
 334                 log_err("libunbound bg worker init failed, nomem");
 335                 return NULL;
 336         }
 337         ctx = w->ctx;
 338         log_thread_set(&w->thread_num);
 339 #ifdef THREADS_DISABLED
 340         /* we are forked */
 341         w->is_bg_thread = 0;
 342         /* close non-used parts of the pipes */
 343         tube_close_write(ctx->qq_pipe);
 344         tube_close_read(ctx->rr_pipe);
 345 #endif
 346         if(!tube_setup_bg_listen(ctx->qq_pipe, w->base,
 347                 libworker_handle_control_cmd, w)) {
 348                 log_err("libunbound bg worker init failed, no bglisten");
 349                 return NULL;
 350         }
 351         if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) {
 352                 log_err("libunbound bg worker init failed, no bgwrite");
 353                 return NULL;
 354         }
 355
 356         /* do the work */
 357         comm_base_dispatch(w->base);
 358
 359         /* cleanup */
 360         m = UB_LIBCMD_QUIT;
 361         w->want_quit = 1;
 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
 375 int 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 /** insert canonname */
 421 static int
 422 fill_canon(struct ub_result* res, uint8_t* s)
 423 {
 424         char buf[255+2];
 425         dname_str(s, buf);
 426         res->canonname = strdup(buf);
 427         return res->canonname != 0;
 428 }
 429
 430 /** fill data into result */
 431 static int
 432 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer,
 433         uint8_t* finalcname, struct query_info* rq, struct reply_info* rep)
 434 {
 435         size_t i;
 436         struct packed_rrset_data* data;
 437         res->ttl = 0;
 438         if(!answer) {
 439                 if(finalcname) {
 440                         if(!fill_canon(res, finalcname))
 441                                 return 0; /* out of memory */
 442                 }
 443                 if(rep->rrset_count != 0)
 444                         res->ttl = (int)rep->ttl;
 445                 res->data = (char**)calloc(1, sizeof(char*));
 446                 res->len = (int*)calloc(1, sizeof(int));
 447                 return (res->data && res->len);
 448         }
 449         data = (struct packed_rrset_data*)answer->entry.data;
 450         if(query_dname_compare(rq->qname, answer->rk.dname) != 0) {
 451                 if(!fill_canon(res, answer->rk.dname))
 452                         return 0; /* out of memory */
 453         } else  res->canonname = NULL;
 454         res->data = (char**)calloc(data->count+1, sizeof(char*));
 455         res->len = (int*)calloc(data->count+1, sizeof(int));
 456         if(!res->data || !res->len)
 457                 return 0; /* out of memory */
 458         for(i=0; i<data->count; i++) {
 459                 /* remove rdlength from rdata */
 460                 res->len[i] = (int)(data->rr_len[i] - 2);
 461                 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]);
 462                 if(!res->data[i])
 463                         return 0; /* out of memory */
 464         }
 465         /* ttl for positive answers, from CNAME and answer RRs */
 466         if(data->count != 0) {
 467                 size_t j;
 468                 res->ttl = (int)data->ttl;
 469                 for(j=0; j<rep->an_numrrsets; j++) {
 470                         struct packed_rrset_data* d =
 471                                 (struct packed_rrset_data*)rep->rrsets[j]->
 472                                 entry.data;
 473                         if((int)d->ttl < res->ttl)
 474                                 res->ttl = (int)d->ttl;
 475                 }
 476         }
 477         /* ttl for negative answers */
 478         if(data->count == 0 && rep->rrset_count != 0)
 479                 res->ttl = (int)rep->ttl;
 480         res->data[data->count] = NULL;
 481         res->len[data->count] = 0;
 482         return 1;
 483 }
 484
 485 /** fill result from parsed message, on error fills servfail */
 486 void
 487 libworker_enter_result(struct ub_result* res, sldns_buffer* buf,
 488         struct regional* temp, enum sec_status msg_security)
 489 {
 490         struct query_info rq;
 491         struct reply_info* rep;
 492         res->rcode = LDNS_RCODE_SERVFAIL;
 493         rep = parse_reply_in_temp_region(buf, temp, &rq);
 494         if(!rep) {
 495                 log_err("cannot parse buf");
 496                 return; /* error parsing buf, or out of memory */
 497         }
 498         if(!fill_res(res, reply_find_answer_rrset(&rq, rep),
 499                 reply_find_final_cname_target(&rq, rep), &rq, rep))
 500                 return; /* out of memory */
 501         /* rcode, havedata, nxdomain, secure, bogus */
 502         res->rcode = (int)FLAGS_GET_RCODE(rep->flags);
 503         if(res->data && res->data[0])
 504                 res->havedata = 1;
 505         if(res->rcode == LDNS_RCODE_NXDOMAIN)
 506                 res->nxdomain = 1;
 507         if(msg_security == sec_status_secure)
 508                 res->secure = 1;
 509         if(msg_security == sec_status_bogus ||
 510                 msg_security == sec_status_secure_sentinel_fail)
 511                 res->bogus = 1;
 512 }
 513
 514 /** fillup fg results */
 515 static void
 516 libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf,
 517         enum sec_status s, char* why_bogus, int was_ratelimited)
 518 {
 519         q->res->was_ratelimited = was_ratelimited;
 520         if(why_bogus)
 521                 q->res->why_bogus = strdup(why_bogus);
 522         if(rcode != 0) {
 523                 q->res->rcode = rcode;
 524                 q->msg_security = s;
 525                 return;
 526         }
 527
 528         q->res->rcode = LDNS_RCODE_SERVFAIL;
 529         q->msg_security = sec_status_unchecked;
 530         q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf));
 531         q->msg_len = sldns_buffer_limit(buf);
 532         if(!q->msg) {
 533                 return; /* the error is in the rcode */
 534         }
 535
 536         /* canonname and results */
 537         q->msg_security = s;
 538         libworker_enter_result(q->res, buf, q->w->env->scratch, s);
 539 }
 540
 541 void
 542 libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 543         char* why_bogus, int was_ratelimited)
 544 {
 545         struct ctx_query* q = (struct ctx_query*)arg;
 546         /* fg query is done; exit comm base */
 547         comm_base_exit(q->w->base);
 548
 549         libworker_fillup_fg(q, rcode, buf, s, why_bogus, was_ratelimited);
 550 }
 551
 552 /** setup qinfo and edns */
 553 static int
 554 setup_qinfo_edns(struct libworker* w, struct ctx_query* q,
 555         struct query_info* qinfo, struct edns_data* edns)
 556 {
 557         qinfo->qtype = (uint16_t)q->res->qtype;
 558         qinfo->qclass = (uint16_t)q->res->qclass;
 559         qinfo->local_alias = NULL;
 560         qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len);
 561         if(!qinfo->qname) {
 562                 return 0;
 563         }
 564         edns->edns_present = 1;
 565         edns->ext_rcode = 0;
 566         edns->edns_version = 0;
 567         edns->bits = EDNS_DO;
 568         edns->opt_list = NULL;
 569         if(sldns_buffer_capacity(w->back->udp_buff) < 65535)
 570                 edns->udp_size = (uint16_t)sldns_buffer_capacity(
 571                         w->back->udp_buff);
 572         else    edns->udp_size = 65535;
 573         return 1;
 574 }
 575
 576 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)
 577 {
 578         struct libworker* w = libworker_setup(ctx, 0, NULL);
 579         uint16_t qflags, qid;
 580         struct query_info qinfo;
 581         struct edns_data edns;
 582         if(!w)
 583                 return UB_INITFAIL;
 584         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 585                 libworker_delete(w);
 586                 return UB_SYNTAX;
 587         }
 588         qid = 0;
 589         qflags = BIT_RD;
 590         q->w = w;
 591         /* see if there is a fixed answer */
 592         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 593         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 594         if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns,
 595                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 596                 NULL, 0, NULL, 0, NULL)) {
 597                 regional_free_all(w->env->scratch);
 598                 libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
 599                         w->back->udp_buff, sec_status_insecure, NULL, 0);
 600                 libworker_delete(w);
 601                 free(qinfo.qname);
 602                 return UB_NOERROR;
 603         }
 604         if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones,
 605                 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) {
 606                 regional_free_all(w->env->scratch);
 607                 libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
 608                         w->back->udp_buff, sec_status_insecure, NULL, 0);
 609                 libworker_delete(w);
 610                 free(qinfo.qname);
 611                 return UB_NOERROR;
 612         }
 613         /* process new query */
 614         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 615                 w->back->udp_buff, qid, libworker_fg_done_cb, q)) {
 616                 free(qinfo.qname);
 617                 return UB_NOMEM;
 618         }
 619         free(qinfo.qname);
 620
 621         /* wait for reply */
 622         comm_base_dispatch(w->base);
 623
 624         libworker_delete(w);
 625         return UB_NOERROR;
 626 }
 627
 628 void
 629 libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf,
 630         enum sec_status s, char* why_bogus, int was_ratelimited)
 631 {
 632         struct ctx_query* q = (struct ctx_query*)arg;
 633         ub_event_callback_type cb = q->cb_event;
 634         void* cb_arg = q->cb_arg;
 635         int cancelled = q->cancelled;
 636
 637         /* delete it now */
 638         struct ub_ctx* ctx = q->w->ctx;
 639         lock_basic_lock(&ctx->cfglock);
 640         (void)rbtree_delete(&ctx->queries, q->node.key);
 641         ctx->num_async--;
 642         context_query_delete(q);
 643         lock_basic_unlock(&ctx->cfglock);
 644
 645         if(!cancelled) {
 646                 /* call callback */
 647                 int sec = 0;
 648                 if(s == sec_status_bogus)
 649                         sec = 1;
 650                 else if(s == sec_status_secure)
 651                         sec = 2;
 652                 (*cb)(cb_arg, rcode, (buf?(void*)sldns_buffer_begin(buf):NULL),
 653                         (buf?(int)sldns_buffer_limit(buf):0), sec, why_bogus, was_ratelimited);
 654         }
 655 }
 656
 657 int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,
 658         int* async_id)
 659 {
 660         struct libworker* w = ctx->event_worker;
 661         uint16_t qflags, qid;
 662         struct query_info qinfo;
 663         struct edns_data edns;
 664         if(!w)
 665                 return UB_INITFAIL;
 666         if(!setup_qinfo_edns(w, q, &qinfo, &edns))
 667                 return UB_SYNTAX;
 668         qid = 0;
 669         qflags = BIT_RD;
 670         q->w = w;
 671         /* see if there is a fixed answer */
 672         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 673         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 674         if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns,
 675                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 676                 NULL, 0, NULL, 0, NULL)) {
 677                 regional_free_all(w->env->scratch);
 678                 free(qinfo.qname);
 679                 libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
 680                         w->back->udp_buff, sec_status_insecure, NULL, 0);
 681                 return UB_NOERROR;
 682         }
 683         if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones,
 684                 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) {
 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         /* process new query */
 692         if(async_id)
 693                 *async_id = q->querynum;
 694         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 695                 w->back->udp_buff, qid, libworker_event_done_cb, q)) {
 696                 free(qinfo.qname);
 697                 return UB_NOMEM;
 698         }
 699         free(qinfo.qname);
 700         return UB_NOERROR;
 701 }
 702
 703 /** add result to the bg worker result queue */
 704 static void
 705 add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt,
 706         int err, char* reason, int was_ratelimited)
 707 {
 708         uint8_t* msg = NULL;
 709         uint32_t len = 0;
 710
 711         if(w->want_quit) {
 712                 context_query_delete(q);
 713                 return;
 714         }
 715         /* serialize and delete unneeded q */
 716         if(w->is_bg_thread) {
 717                 lock_basic_lock(&w->ctx->cfglock);
 718                 if(reason)
 719                         q->res->why_bogus = strdup(reason);
 720                 q->res->was_ratelimited = was_ratelimited;
 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, NULL, &len);
 726                         } else {
 727                                 msg = context_serialize_answer(q, err, NULL, &len);
 728                         }
 729                 } else {
 730                         msg = context_serialize_answer(q, err, NULL, &len);
 731                 }
 732                 lock_basic_unlock(&w->ctx->cfglock);
 733         } else {
 734                 if(reason)
 735                         q->res->why_bogus = strdup(reason);
 736                 q->res->was_ratelimited = was_ratelimited;
 737                 msg = context_serialize_answer(q, err, pkt, &len);
 738                 (void)rbtree_delete(&w->ctx->queries, q->node.key);
 739                 w->ctx->num_async--;
 740                 context_query_delete(q);
 741         }
 742
 743         if(!msg) {
 744                 log_err("out of memory for async answer");
 745                 return;
 746         }
 747         if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) {
 748                 log_err("out of memory for async answer");
 749                 return;
 750         }
 751 }
 752
 753 void
 754 libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 755         char* why_bogus, int was_ratelimited)
 756 {
 757         struct ctx_query* q = (struct ctx_query*)arg;
 758
 759         if(q->cancelled || q->w->back->want_to_quit) {
 760                 if(q->w->is_bg_thread) {
 761                         /* delete it now */
 762                         struct ub_ctx* ctx = q->w->ctx;
 763                         lock_basic_lock(&ctx->cfglock);
 764                         (void)rbtree_delete(&ctx->queries, q->node.key);
 765                         ctx->num_async--;
 766                         context_query_delete(q);
 767                         lock_basic_unlock(&ctx->cfglock);
 768                 }
 769                 /* cancelled, do not give answer */
 770                 return;
 771         }
 772         q->msg_security = s;
 773         if(!buf) {
 774                 buf = q->w->env->scratch_buffer;
 775         }
 776         if(rcode != 0) {
 777                 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL);
 778         }
 779         add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus, was_ratelimited);
 780 }
 781
 782
 783 /** handle new query command for bg worker */
 784 static void
 785 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len)
 786 {
 787         uint16_t qflags, qid;
 788         struct query_info qinfo;
 789         struct edns_data edns;
 790         struct ctx_query* q;
 791         if(w->is_bg_thread) {
 792                 lock_basic_lock(&w->ctx->cfglock);
 793                 q = context_lookup_new_query(w->ctx, buf, len);
 794                 lock_basic_unlock(&w->ctx->cfglock);
 795         } else {
 796                 q = context_deserialize_new_query(w->ctx, buf, len);
 797         }
 798         free(buf);
 799         if(!q) {
 800                 log_err("failed to deserialize newq");
 801                 return;
 802         }
 803         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 804                 add_bg_result(w, q, NULL, UB_SYNTAX, NULL, 0);
 805                 return;
 806         }
 807         qid = 0;
 808         qflags = BIT_RD;
 809         /* see if there is a fixed answer */
 810         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 811         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 812         if(local_zones_answer(w->ctx->local_zones, w->env, &qinfo, &edns,
 813                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 814                 NULL, 0, NULL, 0, NULL)) {
 815                 regional_free_all(w->env->scratch);
 816                 q->msg_security = sec_status_insecure;
 817                 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL, 0);
 818                 free(qinfo.qname);
 819                 return;
 820         }
 821         if(w->ctx->env->auth_zones && auth_zones_answer(w->ctx->env->auth_zones,
 822                 w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) {
 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         q->w = w;
 830         /* process new query */
 831         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 832                 w->back->udp_buff, qid, libworker_bg_done_cb, q)) {
 833                 add_bg_result(w, q, NULL, UB_NOMEM, NULL, 0);
 834         }
 835         free(qinfo.qname);
 836 }
 837
 838 void libworker_alloc_cleanup(void* arg)
 839 {
 840         struct libworker* w = (struct libworker*)arg;
 841         slabhash_clear(&w->env->rrset_cache->table);
 842         slabhash_clear(w->env->msg_cache);
 843 }
 844
 845 struct outbound_entry* libworker_send_query(struct query_info* qinfo,
 846         uint16_t flags, int dnssec, int want_dnssec, int nocaps,
 847         struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
 848         size_t zonelen, int ssl_upstream, char* tls_auth_name,
 849         struct module_qstate* q)
 850 {
 851         struct libworker* w = (struct libworker*)q->env->worker;
 852         struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
 853                 q->region, sizeof(*e));
 854         if(!e)
 855                 return NULL;
 856         e->qstate = q;
 857         e->qsent = outnet_serviced_query(w->back, qinfo, flags, dnssec,
 858                 want_dnssec, nocaps, q->env->cfg->tcp_upstream, ssl_upstream,
 859                 tls_auth_name, addr, addrlen, zone, zonelen, q,
 860                 libworker_handle_service_reply, e, w->back->udp_buff, q->env);
 861         if(!e->qsent) {
 862                 return NULL;
 863         }
 864         return e;
 865 }
 866
 867 int
 868 libworker_handle_reply(struct comm_point* c, void* arg, int error,
 869         struct comm_reply* reply_info)
 870 {
 871         struct module_qstate* q = (struct module_qstate*)arg;
 872         struct libworker* lw = (struct libworker*)q->env->worker;
 873         struct outbound_entry e;
 874         e.qstate = q;
 875         e.qsent = NULL;
 876
 877         if(error != 0) {
 878                 mesh_report_reply(lw->env->mesh, &e, reply_info, error);
 879                 return 0;
 880         }
 881         /* sanity check. */
 882         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 883                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 884                         LDNS_PACKET_QUERY
 885                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 886                 /* error becomes timeout for the module as if this reply
 887                  * never arrived. */
 888                 mesh_report_reply(lw->env->mesh, &e, reply_info,
 889                         NETEVENT_TIMEOUT);
 890                 return 0;
 891         }
 892         mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR);
 893         return 0;
 894 }
 895
 896 int
 897 libworker_handle_service_reply(struct comm_point* c, void* arg, int error,
 898         struct comm_reply* reply_info)
 899 {
 900         struct outbound_entry* e = (struct outbound_entry*)arg;
 901         struct libworker* lw = (struct libworker*)e->qstate->env->worker;
 902
 903         if(error != 0) {
 904                 mesh_report_reply(lw->env->mesh, e, reply_info, error);
 905                 return 0;
 906         }
 907         /* sanity check. */
 908         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 909                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 910                         LDNS_PACKET_QUERY
 911                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 912                 /* error becomes timeout for the module as if this reply
 913                  * never arrived. */
 914                 mesh_report_reply(lw->env->mesh, e, reply_info,
 915                         NETEVENT_TIMEOUT);
 916                 return 0;
 917         }
 918         mesh_report_reply(lw->env->mesh,  e, reply_info, NETEVENT_NOERROR);
 919         return 0;
 920 }
 921
 922 /* --- fake callbacks for fptr_wlist to work --- */
 923 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 924         uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
 925         int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
 926 {
 927         log_assert(0);
 928 }
 929
 930 int worker_handle_request(struct comm_point* ATTR_UNUSED(c),
 931         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 932         struct comm_reply* ATTR_UNUSED(repinfo))
 933 {
 934         log_assert(0);
 935         return 0;
 936 }
 937
 938 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c),
 939         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 940         struct comm_reply* ATTR_UNUSED(reply_info))
 941 {
 942         log_assert(0);
 943         return 0;
 944 }
 945
 946 int worker_handle_service_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 remote_accept_callback(struct comm_point* ATTR_UNUSED(c),
 955         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 956         struct comm_reply* ATTR_UNUSED(repinfo))
 957 {
 958         log_assert(0);
 959         return 0;
 960 }
 961
 962 int remote_control_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 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg))
 971 {
 972         log_assert(0);
 973 }
 974
 975 struct outbound_entry* worker_send_query(struct query_info* ATTR_UNUSED(qinfo),
 976         uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec),
 977         int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps),
 978         struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen),
 979         uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen),
 980         int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name),
 981         struct module_qstate* ATTR_UNUSED(q))
 982 {
 983         log_assert(0);
 984         return 0;
 985 }
 986
 987 void
 988 worker_alloc_cleanup(void* ATTR_UNUSED(arg))
 989 {
 990         log_assert(0);
 991 }
 992
 993 void worker_stat_timer_cb(void* ATTR_UNUSED(arg))
 994 {
 995         log_assert(0);
 996 }
 997
 998 void worker_probe_timer_cb(void* ATTR_UNUSED(arg))
 999 {
1000         log_assert(0);
1001 }
1002
1003 void worker_start_accept(void* ATTR_UNUSED(arg))
1004 {
1005         log_assert(0);
1006 }
1007
1008 void worker_stop_accept(void* ATTR_UNUSED(arg))
1009 {
1010         log_assert(0);
1011 }
1012
1013 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
1014 {
1015         log_assert(0);
1016         return 0;
1017 }
1018
1019 int
1020 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1021 {
1022         log_assert(0);
1023         return 0;
1024 }
1025
1026 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1027 {
1028         log_assert(0);
1029         return 0;
1030 }
1031
1032 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg))
1033 {
1034         log_assert(0);
1035 }
1036
1037 #ifdef UB_ON_WINDOWS
1038 void
1039 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void*
1040         ATTR_UNUSED(arg)) {
1041         log_assert(0);
1042 }
1043
1044 void
1045 wsvc_cron_cb(void* ATTR_UNUSED(arg))
1046 {
1047         log_assert(0);
1048 }
1049 #endif /* UB_ON_WINDOWS */