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 "util/fptr_wlist.h"
  59 #include "util/module.h"
  60 #include "util/regional.h"
  61 #include "util/random.h"
  62 #include "util/config_file.h"
  63 #include "util/netevent.h"
  64 #include "util/storage/lookup3.h"
  65 #include "util/storage/slabhash.h"
  66 #include "util/net_help.h"
  67 #include "util/data/dname.h"
  68 #include "util/data/msgreply.h"
  69 #include "util/data/msgencode.h"
  70 #include "util/tube.h"
  71 #include "iterator/iter_fwd.h"
  72 #include "iterator/iter_hints.h"
  73 #include "ldns/sbuffer.h"
  74 #include "ldns/str2wire.h"
  75
  76 /** handle new query command for bg worker */
  77 static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len);
  78
  79 /** delete libworker env */
  80 static void
  81 libworker_delete_env(struct libworker* w)
  82 {
  83         if(w->env) {
  84                 outside_network_quit_prepare(w->back);
  85                 mesh_delete(w->env->mesh);
  86                 context_release_alloc(w->ctx, w->env->alloc,
  87                         !w->is_bg || w->is_bg_thread);
  88                 sldns_buffer_free(w->env->scratch_buffer);
  89                 regional_destroy(w->env->scratch);
  90                 forwards_delete(w->env->fwds);
  91                 hints_delete(w->env->hints);
  92                 ub_randfree(w->env->rnd);
  93                 free(w->env);
  94         }
  95 #ifdef HAVE_SSL
  96         SSL_CTX_free(w->sslctx);
  97 #endif
  98         outside_network_delete(w->back);
  99 }
 100
 101 /** delete libworker struct */
 102 static void
 103 libworker_delete(struct libworker* w)
 104 {
 105         if(!w) return;
 106         libworker_delete_env(w);
 107         comm_base_delete(w->base);
 108         free(w);
 109 }
 110
 111 void
 112 libworker_delete_event(struct libworker* w)
 113 {
 114         if(!w) return;
 115         libworker_delete_env(w);
 116         comm_base_delete_no_base(w->base);
 117         free(w);
 118 }
 119
 120 /** setup fresh libworker struct */
 121 static struct libworker*
 122 libworker_setup(struct ub_ctx* ctx, int is_bg, struct event_base* eb)
 123 {
 124         unsigned int seed;
 125         struct libworker* w = (struct libworker*)calloc(1, sizeof(*w));
 126         struct config_file* cfg = ctx->env->cfg;
 127         int* ports;
 128         int numports;
 129         if(!w) return NULL;
 130         w->is_bg = is_bg;
 131         w->ctx = ctx;
 132         w->env = (struct module_env*)malloc(sizeof(*w->env));
 133         if(!w->env) {
 134                 free(w);
 135                 return NULL;
 136         }
 137         *w->env = *ctx->env;
 138         w->env->alloc = context_obtain_alloc(ctx, !w->is_bg || w->is_bg_thread);
 139         if(!w->env->alloc) {
 140                 libworker_delete(w);
 141                 return NULL;
 142         }
 143         w->thread_num = w->env->alloc->thread_num;
 144         alloc_set_id_cleanup(w->env->alloc, &libworker_alloc_cleanup, w);
 145         if(!w->is_bg || w->is_bg_thread) {
 146                 lock_basic_lock(&ctx->cfglock);
 147         }
 148         w->env->scratch = regional_create_custom(cfg->msg_buffer_size);
 149         w->env->scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size);
 150         w->env->fwds = forwards_create();
 151         if(w->env->fwds && !forwards_apply_cfg(w->env->fwds, cfg)) {
 152                 forwards_delete(w->env->fwds);
 153                 w->env->fwds = NULL;
 154         }
 155         w->env->hints = hints_create();
 156         if(w->env->hints && !hints_apply_cfg(w->env->hints, cfg)) {
 157                 hints_delete(w->env->hints);
 158                 w->env->hints = NULL;
 159         }
 160         if(cfg->ssl_upstream) {
 161                 w->sslctx = connect_sslctx_create(NULL, NULL, NULL);
 162                 if(!w->sslctx) {
 163                         /* to make the setup fail after unlock */
 164                         hints_delete(w->env->hints);
 165                         w->env->hints = NULL;
 166                 }
 167         }
 168         if(!w->is_bg || w->is_bg_thread) {
 169                 lock_basic_unlock(&ctx->cfglock);
 170         }
 171         if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds ||
 172                 !w->env->hints) {
 173                 libworker_delete(w);
 174                 return NULL;
 175         }
 176         w->env->worker = (struct worker*)w;
 177         w->env->probe_timer = NULL;
 178         seed = (unsigned int)time(NULL) ^ (unsigned int)getpid() ^
 179                 (((unsigned int)w->thread_num)<<17);
 180         seed ^= (unsigned int)w->env->alloc->next_id;
 181         if(!w->is_bg || w->is_bg_thread) {
 182                 lock_basic_lock(&ctx->cfglock);
 183         }
 184         if(!(w->env->rnd = ub_initstate(seed, ctx->seed_rnd))) {
 185                 if(!w->is_bg || w->is_bg_thread) {
 186                         lock_basic_unlock(&ctx->cfglock);
 187                 }
 188                 seed = 0;
 189                 libworker_delete(w);
 190                 return NULL;
 191         }
 192         if(!w->is_bg || w->is_bg_thread) {
 193                 lock_basic_unlock(&ctx->cfglock);
 194         }
 195         if(1) {
 196                 /* primitive lockout for threading: if it overwrites another
 197                  * thread it is like wiping the cache (which is likely empty
 198                  * at the start) */
 199                 /* note we are holding the ctx lock in normal threaded
 200                  * cases so that is solved properly, it is only for many ctx
 201                  * in different threads that this may clash */
 202                 static int done_raninit = 0;
 203                 if(!done_raninit) {
 204                         done_raninit = 1;
 205                         hash_set_raninit((uint32_t)ub_random(w->env->rnd));
 206                 }
 207         }
 208         seed = 0;
 209
 210         if(eb)
 211                 w->base = comm_base_create_event(eb);
 212         else    w->base = comm_base_create(0);
 213         if(!w->base) {
 214                 libworker_delete(w);
 215                 return NULL;
 216         }
 217         if(!w->is_bg || w->is_bg_thread) {
 218                 lock_basic_lock(&ctx->cfglock);
 219         }
 220         numports = cfg_condense_ports(cfg, &ports);
 221         if(numports == 0) {
 222                 int locked = !w->is_bg || w->is_bg_thread;
 223                 libworker_delete(w);
 224                 if(locked) {
 225                         lock_basic_unlock(&ctx->cfglock);
 226                 }
 227                 return NULL;
 228         }
 229         w->back = outside_network_create(w->base, cfg->msg_buffer_size,
 230                 (size_t)cfg->outgoing_num_ports, cfg->out_ifs,
 231                 cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6,
 232                 cfg->do_tcp?cfg->outgoing_num_tcp:0,
 233                 w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id,
 234                 ports, numports, cfg->unwanted_threshold,
 235                 &libworker_alloc_cleanup, w, cfg->do_udp, w->sslctx,
 236                 cfg->delay_close, NULL);
 237         if(!w->is_bg || w->is_bg_thread) {
 238                 lock_basic_unlock(&ctx->cfglock);
 239         }
 240         free(ports);
 241         if(!w->back) {
 242                 libworker_delete(w);
 243                 return NULL;
 244         }
 245         w->env->mesh = mesh_create(&ctx->mods, w->env);
 246         if(!w->env->mesh) {
 247                 libworker_delete(w);
 248                 return NULL;
 249         }
 250         w->env->send_query = &libworker_send_query;
 251         w->env->detach_subs = &mesh_detach_subs;
 252         w->env->attach_sub = &mesh_attach_sub;
 253         w->env->kill_sub = &mesh_state_delete;
 254         w->env->detect_cycle = &mesh_detect_cycle;
 255         comm_base_timept(w->base, &w->env->now, &w->env->now_tv);
 256         return w;
 257 }
 258
 259 struct libworker* libworker_create_event(struct ub_ctx* ctx,
 260         struct event_base* eb)
 261 {
 262         return libworker_setup(ctx, 0, eb);
 263 }
 264
 265 /** handle cancel command for bg worker */
 266 static void
 267 handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len)
 268 {
 269         struct ctx_query* q;
 270         if(w->is_bg_thread) {
 271                 lock_basic_lock(&w->ctx->cfglock);
 272                 q = context_deserialize_cancel(w->ctx, buf, len);
 273                 lock_basic_unlock(&w->ctx->cfglock);
 274         } else {
 275                 q = context_deserialize_cancel(w->ctx, buf, len);
 276         }
 277         if(!q) {
 278                 /* probably simply lookup failed, i.e. the message had been
 279                  * processed and answered before the cancel arrived */
 280                 return;
 281         }
 282         q->cancelled = 1;
 283         free(buf);
 284 }
 285
 286 /** do control command coming into bg server */
 287 static void
 288 libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len)
 289 {
 290         switch(context_serial_getcmd(msg, len)) {
 291                 default:
 292                 case UB_LIBCMD_ANSWER:
 293                         log_err("unknown command for bg worker %d",
 294                                 (int)context_serial_getcmd(msg, len));
 295                         /* and fall through to quit */
 296                 case UB_LIBCMD_QUIT:
 297                         free(msg);
 298                         comm_base_exit(w->base);
 299                         break;
 300                 case UB_LIBCMD_NEWQUERY:
 301                         handle_newq(w, msg, len);
 302                         break;
 303                 case UB_LIBCMD_CANCEL:
 304                         handle_cancel(w, msg, len);
 305                         break;
 306         }
 307 }
 308
 309 /** handle control command coming into server */
 310 void
 311 libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 312         uint8_t* msg, size_t len, int err, void* arg)
 313 {
 314         struct libworker* w = (struct libworker*)arg;
 315
 316         if(err != 0) {
 317                 free(msg);
 318                 /* it is of no use to go on, exit */
 319                 comm_base_exit(w->base);
 320                 return;
 321         }
 322         libworker_do_cmd(w, msg, len); /* also frees the buf */
 323 }
 324
 325 /** the background thread func */
 326 static void*
 327 libworker_dobg(void* arg)
 328 {
 329         /* setup */
 330         uint32_t m;
 331         struct libworker* w = (struct libworker*)arg;
 332         struct ub_ctx* ctx;
 333         if(!w) {
 334                 log_err("libunbound bg worker init failed, nomem");
 335                 return NULL;
 336         }
 337         ctx = w->ctx;
 338         log_thread_set(&w->thread_num);
 339 #ifdef THREADS_DISABLED
 340         /* we are forked */
 341         w->is_bg_thread = 0;
 342         /* close non-used parts of the pipes */
 343         tube_close_write(ctx->qq_pipe);
 344         tube_close_read(ctx->rr_pipe);
 345 #endif
 346         if(!tube_setup_bg_listen(ctx->qq_pipe, w->base,
 347                 libworker_handle_control_cmd, w)) {
 348                 log_err("libunbound bg worker init failed, no bglisten");
 349                 return NULL;
 350         }
 351         if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) {
 352                 log_err("libunbound bg worker init failed, no bgwrite");
 353                 return NULL;
 354         }
 355
 356         /* do the work */
 357         comm_base_dispatch(w->base);
 358
 359         /* cleanup */
 360         m = UB_LIBCMD_QUIT;
 361         tube_remove_bg_listen(w->ctx->qq_pipe);
 362         tube_remove_bg_write(w->ctx->rr_pipe);
 363         libworker_delete(w);
 364         (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m,
 365                 (uint32_t)sizeof(m), 0);
 366 #ifdef THREADS_DISABLED
 367         /* close pipes from forked process before exit */
 368         tube_close_read(ctx->qq_pipe);
 369         tube_close_write(ctx->rr_pipe);
 370 #endif
 371         return NULL;
 372 }
 373
 374 int libworker_bg(struct ub_ctx* ctx)
 375 {
 376         struct libworker* w;
 377         /* fork or threadcreate */
 378         lock_basic_lock(&ctx->cfglock);
 379         if(ctx->dothread) {
 380                 lock_basic_unlock(&ctx->cfglock);
 381                 w = libworker_setup(ctx, 1, NULL);
 382                 if(!w) return UB_NOMEM;
 383                 w->is_bg_thread = 1;
 384 #ifdef ENABLE_LOCK_CHECKS
 385                 w->thread_num = 1; /* for nicer DEBUG checklocks */
 386 #endif
 387                 ub_thread_create(&ctx->bg_tid, libworker_dobg, w);
 388         } else {
 389                 lock_basic_unlock(&ctx->cfglock);
 390 #ifndef HAVE_FORK
 391                 /* no fork on windows */
 392                 return UB_FORKFAIL;
 393 #else /* HAVE_FORK */
 394                 switch((ctx->bg_pid=fork())) {
 395                         case 0:
 396                                 w = libworker_setup(ctx, 1, NULL);
 397                                 if(!w) fatal_exit("out of memory");
 398                                 /* close non-used parts of the pipes */
 399                                 tube_close_write(ctx->qq_pipe);
 400                                 tube_close_read(ctx->rr_pipe);
 401                                 (void)libworker_dobg(w);
 402                                 exit(0);
 403                                 break;
 404                         case -1:
 405                                 return UB_FORKFAIL;
 406                         default:
 407                                 /* close non-used parts, so that the worker
 408                                  * bgprocess gets 'pipe closed' when the
 409                                  * main process exits */
 410                                 tube_close_read(ctx->qq_pipe);
 411                                 tube_close_write(ctx->rr_pipe);
 412                                 break;
 413                 }
 414 #endif /* HAVE_FORK */
 415         }
 416         return UB_NOERROR;
 417 }
 418
 419 /** get msg reply struct (in temp region) */
 420 static struct reply_info*
 421 parse_reply(sldns_buffer* pkt, struct regional* region, struct query_info* qi)
 422 {
 423         struct reply_info* rep;
 424         struct msg_parse* msg;
 425         if(!(msg = regional_alloc(region, sizeof(*msg)))) {
 426                 return NULL;
 427         }
 428         memset(msg, 0, sizeof(*msg));
 429         sldns_buffer_set_position(pkt, 0);
 430         if(parse_packet(pkt, msg, region) != 0)
 431                 return 0;
 432         if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) {
 433                 return 0;
 434         }
 435         return rep;
 436 }
 437
 438 /** insert canonname */
 439 static int
 440 fill_canon(struct ub_result* res, uint8_t* s)
 441 {
 442         char buf[255+2];
 443         dname_str(s, buf);
 444         res->canonname = strdup(buf);
 445         return res->canonname != 0;
 446 }
 447
 448 /** fill data into result */
 449 static int
 450 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer,
 451         uint8_t* finalcname, struct query_info* rq, struct reply_info* rep)
 452 {
 453         size_t i;
 454         struct packed_rrset_data* data;
 455         res->ttl = 0;
 456         if(!answer) {
 457                 if(finalcname) {
 458                         if(!fill_canon(res, finalcname))
 459                                 return 0; /* out of memory */
 460                 }
 461                 if(rep->rrset_count != 0)
 462                         res->ttl = (int)rep->ttl;
 463                 res->data = (char**)calloc(1, sizeof(char*));
 464                 res->len = (int*)calloc(1, sizeof(int));
 465                 return (res->data && res->len);
 466         }
 467         data = (struct packed_rrset_data*)answer->entry.data;
 468         if(query_dname_compare(rq->qname, answer->rk.dname) != 0) {
 469                 if(!fill_canon(res, answer->rk.dname))
 470                         return 0; /* out of memory */
 471         } else  res->canonname = NULL;
 472         res->data = (char**)calloc(data->count+1, sizeof(char*));
 473         res->len = (int*)calloc(data->count+1, sizeof(int));
 474         if(!res->data || !res->len)
 475                 return 0; /* out of memory */
 476         for(i=0; i<data->count; i++) {
 477                 /* remove rdlength from rdata */
 478                 res->len[i] = (int)(data->rr_len[i] - 2);
 479                 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]);
 480                 if(!res->data[i])
 481                         return 0; /* out of memory */
 482         }
 483         /* ttl for positive answers, from CNAME and answer RRs */
 484         if(data->count != 0) {
 485                 size_t j;
 486                 res->ttl = (int)data->ttl;
 487                 for(j=0; j<rep->an_numrrsets; j++) {
 488                         struct packed_rrset_data* d =
 489                                 (struct packed_rrset_data*)rep->rrsets[j]->
 490                                 entry.data;
 491                         if((int)d->ttl < res->ttl)
 492                                 res->ttl = (int)d->ttl;
 493                 }
 494         }
 495         /* ttl for negative answers */
 496         if(data->count == 0 && rep->rrset_count != 0)
 497                 res->ttl = (int)rep->ttl;
 498         res->data[data->count] = NULL;
 499         res->len[data->count] = 0;
 500         return 1;
 501 }
 502
 503 /** fill result from parsed message, on error fills servfail */
 504 void
 505 libworker_enter_result(struct ub_result* res, sldns_buffer* buf,
 506         struct regional* temp, enum sec_status msg_security)
 507 {
 508         struct query_info rq;
 509         struct reply_info* rep;
 510         res->rcode = LDNS_RCODE_SERVFAIL;
 511         rep = parse_reply(buf, temp, &rq);
 512         if(!rep) {
 513                 log_err("cannot parse buf");
 514                 return; /* error parsing buf, or out of memory */
 515         }
 516         if(!fill_res(res, reply_find_answer_rrset(&rq, rep),
 517                 reply_find_final_cname_target(&rq, rep), &rq, rep))
 518                 return; /* out of memory */
 519         /* rcode, havedata, nxdomain, secure, bogus */
 520         res->rcode = (int)FLAGS_GET_RCODE(rep->flags);
 521         if(res->data && res->data[0])
 522                 res->havedata = 1;
 523         if(res->rcode == LDNS_RCODE_NXDOMAIN)
 524                 res->nxdomain = 1;
 525         if(msg_security == sec_status_secure)
 526                 res->secure = 1;
 527         if(msg_security == sec_status_bogus)
 528                 res->bogus = 1;
 529 }
 530
 531 /** fillup fg results */
 532 static void
 533 libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf,
 534         enum sec_status s, char* why_bogus)
 535 {
 536         if(why_bogus)
 537                 q->res->why_bogus = strdup(why_bogus);
 538         if(rcode != 0) {
 539                 q->res->rcode = rcode;
 540                 q->msg_security = s;
 541                 return;
 542         }
 543
 544         q->res->rcode = LDNS_RCODE_SERVFAIL;
 545         q->msg_security = 0;
 546         q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf));
 547         q->msg_len = sldns_buffer_limit(buf);
 548         if(!q->msg) {
 549                 return; /* the error is in the rcode */
 550         }
 551
 552         /* canonname and results */
 553         q->msg_security = s;
 554         libworker_enter_result(q->res, buf, q->w->env->scratch, s);
 555 }
 556
 557 void
 558 libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 559         char* why_bogus)
 560 {
 561         struct ctx_query* q = (struct ctx_query*)arg;
 562         /* fg query is done; exit comm base */
 563         comm_base_exit(q->w->base);
 564
 565         libworker_fillup_fg(q, rcode, buf, s, why_bogus);
 566 }
 567
 568 /** setup qinfo and edns */
 569 static int
 570 setup_qinfo_edns(struct libworker* w, struct ctx_query* q,
 571         struct query_info* qinfo, struct edns_data* edns)
 572 {
 573         qinfo->qtype = (uint16_t)q->res->qtype;
 574         qinfo->qclass = (uint16_t)q->res->qclass;
 575         qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len);
 576         if(!qinfo->qname) {
 577                 return 0;
 578         }
 579         edns->edns_present = 1;
 580         edns->ext_rcode = 0;
 581         edns->edns_version = 0;
 582         edns->bits = EDNS_DO;
 583         if(sldns_buffer_capacity(w->back->udp_buff) < 65535)
 584                 edns->udp_size = (uint16_t)sldns_buffer_capacity(
 585                         w->back->udp_buff);
 586         else    edns->udp_size = 65535;
 587         return 1;
 588 }
 589
 590 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)
 591 {
 592         struct libworker* w = libworker_setup(ctx, 0, NULL);
 593         uint16_t qflags, qid;
 594         struct query_info qinfo;
 595         struct edns_data edns;
 596         if(!w)
 597                 return UB_INITFAIL;
 598         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 599                 libworker_delete(w);
 600                 return UB_SYNTAX;
 601         }
 602         qid = 0;
 603         qflags = BIT_RD;
 604         q->w = w;
 605         /* see if there is a fixed answer */
 606         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 607         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 608         if(local_zones_answer(ctx->local_zones, &qinfo, &edns,
 609                 w->back->udp_buff, w->env->scratch, NULL)) {
 610                 regional_free_all(w->env->scratch);
 611                 libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
 612                         w->back->udp_buff, sec_status_insecure, NULL);
 613                 libworker_delete(w);
 614                 free(qinfo.qname);
 615                 return UB_NOERROR;
 616         }
 617         /* process new query */
 618         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 619                 w->back->udp_buff, qid, libworker_fg_done_cb, q)) {
 620                 free(qinfo.qname);
 621                 return UB_NOMEM;
 622         }
 623         free(qinfo.qname);
 624
 625         /* wait for reply */
 626         comm_base_dispatch(w->base);
 627
 628         libworker_delete(w);
 629         return UB_NOERROR;
 630 }
 631
 632 void
 633 libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf,
 634         enum sec_status s, char* why_bogus)
 635 {
 636         struct ctx_query* q = (struct ctx_query*)arg;
 637         ub_event_callback_t cb = (ub_event_callback_t)q->cb;
 638         void* cb_arg = q->cb_arg;
 639         int cancelled = q->cancelled;
 640
 641         /* delete it now */
 642         struct ub_ctx* ctx = q->w->ctx;
 643         lock_basic_lock(&ctx->cfglock);
 644         (void)rbtree_delete(&ctx->queries, q->node.key);
 645         ctx->num_async--;
 646         context_query_delete(q);
 647         lock_basic_unlock(&ctx->cfglock);
 648
 649         if(!cancelled) {
 650                 /* call callback */
 651                 int sec = 0;
 652                 if(s == sec_status_bogus)
 653                         sec = 1;
 654                 else if(s == sec_status_secure)
 655                         sec = 2;
 656                 (*cb)(cb_arg, rcode, (void*)sldns_buffer_begin(buf),
 657                         (int)sldns_buffer_limit(buf), sec, why_bogus);
 658         }
 659 }
 660
 661 int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,
 662         int* async_id)
 663 {
 664         struct libworker* w = ctx->event_worker;
 665         uint16_t qflags, qid;
 666         struct query_info qinfo;
 667         struct edns_data edns;
 668         if(!w)
 669                 return UB_INITFAIL;
 670         if(!setup_qinfo_edns(w, q, &qinfo, &edns))
 671                 return UB_SYNTAX;
 672         qid = 0;
 673         qflags = BIT_RD;
 674         q->w = w;
 675         /* see if there is a fixed answer */
 676         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 677         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 678         if(local_zones_answer(ctx->local_zones, &qinfo, &edns,
 679                 w->back->udp_buff, w->env->scratch, NULL)) {
 680                 regional_free_all(w->env->scratch);
 681                 free(qinfo.qname);
 682                 libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
 683                         w->back->udp_buff, sec_status_insecure, NULL);
 684                 return UB_NOERROR;
 685         }
 686         /* process new query */
 687         if(async_id)
 688                 *async_id = q->querynum;
 689         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 690                 w->back->udp_buff, qid, libworker_event_done_cb, q)) {
 691                 free(qinfo.qname);
 692                 return UB_NOMEM;
 693         }
 694         free(qinfo.qname);
 695         return UB_NOERROR;
 696 }
 697
 698 /** add result to the bg worker result queue */
 699 static void
 700 add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt,
 701         int err, char* reason)
 702 {
 703         uint8_t* msg = NULL;
 704         uint32_t len = 0;
 705
 706         /* serialize and delete unneeded q */
 707         if(w->is_bg_thread) {
 708                 lock_basic_lock(&w->ctx->cfglock);
 709                 if(reason)
 710                         q->res->why_bogus = strdup(reason);
 711                 if(pkt) {
 712                         q->msg_len = sldns_buffer_remaining(pkt);
 713                         q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len);
 714                         if(!q->msg)
 715                                 msg = context_serialize_answer(q, UB_NOMEM,
 716                                 NULL, &len);
 717                         else    msg = context_serialize_answer(q, err,
 718                                 NULL, &len);
 719                 } else msg = context_serialize_answer(q, err, NULL, &len);
 720                 lock_basic_unlock(&w->ctx->cfglock);
 721         } else {
 722                 if(reason)
 723                         q->res->why_bogus = strdup(reason);
 724                 msg = context_serialize_answer(q, err, pkt, &len);
 725                 (void)rbtree_delete(&w->ctx->queries, q->node.key);
 726                 w->ctx->num_async--;
 727                 context_query_delete(q);
 728         }
 729
 730         if(!msg) {
 731                 log_err("out of memory for async answer");
 732                 return;
 733         }
 734         if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) {
 735                 log_err("out of memory for async answer");
 736                 return;
 737         }
 738 }
 739
 740 void
 741 libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 742         char* why_bogus)
 743 {
 744         struct ctx_query* q = (struct ctx_query*)arg;
 745
 746         if(q->cancelled) {
 747                 if(q->w->is_bg_thread) {
 748                         /* delete it now */
 749                         struct ub_ctx* ctx = q->w->ctx;
 750                         lock_basic_lock(&ctx->cfglock);
 751                         (void)rbtree_delete(&ctx->queries, q->node.key);
 752                         ctx->num_async--;
 753                         context_query_delete(q);
 754                         lock_basic_unlock(&ctx->cfglock);
 755                 }
 756                 /* cancelled, do not give answer */
 757                 return;
 758         }
 759         q->msg_security = s;
 760         if(!buf)
 761                 buf = q->w->env->scratch_buffer;
 762         if(rcode != 0) {
 763                 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL);
 764         }
 765         add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus);
 766 }
 767
 768
 769 /** handle new query command for bg worker */
 770 static void
 771 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len)
 772 {
 773         uint16_t qflags, qid;
 774         struct query_info qinfo;
 775         struct edns_data edns;
 776         struct ctx_query* q;
 777         if(w->is_bg_thread) {
 778                 lock_basic_lock(&w->ctx->cfglock);
 779                 q = context_lookup_new_query(w->ctx, buf, len);
 780                 lock_basic_unlock(&w->ctx->cfglock);
 781         } else {
 782                 q = context_deserialize_new_query(w->ctx, buf, len);
 783         }
 784         free(buf);
 785         if(!q) {
 786                 log_err("failed to deserialize newq");
 787                 return;
 788         }
 789         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 790                 add_bg_result(w, q, NULL, UB_SYNTAX, NULL);
 791                 return;
 792         }
 793         qid = 0;
 794         qflags = BIT_RD;
 795         /* see if there is a fixed answer */
 796         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 797         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 798         if(local_zones_answer(w->ctx->local_zones, &qinfo, &edns,
 799                 w->back->udp_buff, w->env->scratch, NULL)) {
 800                 regional_free_all(w->env->scratch);
 801                 q->msg_security = sec_status_insecure;
 802                 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL);
 803                 free(qinfo.qname);
 804                 return;
 805         }
 806         q->w = w;
 807         /* process new query */
 808         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 809                 w->back->udp_buff, qid, libworker_bg_done_cb, q)) {
 810                 add_bg_result(w, q, NULL, UB_NOMEM, NULL);
 811         }
 812         free(qinfo.qname);
 813 }
 814
 815 void libworker_alloc_cleanup(void* arg)
 816 {
 817         struct libworker* w = (struct libworker*)arg;
 818         slabhash_clear(&w->env->rrset_cache->table);
 819         slabhash_clear(w->env->msg_cache);
 820 }
 821
 822 struct outbound_entry* libworker_send_query(uint8_t* qname, size_t qnamelen,
 823         uint16_t qtype, uint16_t qclass, uint16_t flags, int dnssec,
 824         int want_dnssec, int nocaps, struct sockaddr_storage* addr,
 825         socklen_t addrlen, uint8_t* zone, size_t zonelen,
 826         struct module_qstate* q)
 827 {
 828         struct libworker* w = (struct libworker*)q->env->worker;
 829         struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
 830                 q->region, sizeof(*e));
 831         if(!e)
 832                 return NULL;
 833         e->qstate = q;
 834         e->qsent = outnet_serviced_query(w->back, qname,
 835                 qnamelen, qtype, qclass, flags, dnssec, want_dnssec, nocaps,
 836                 q->env->cfg->tcp_upstream, q->env->cfg->ssl_upstream, addr,
 837                 addrlen, zone, zonelen, libworker_handle_service_reply, e,
 838                 w->back->udp_buff);
 839         if(!e->qsent) {
 840                 return NULL;
 841         }
 842         return e;
 843 }
 844
 845 int
 846 libworker_handle_reply(struct comm_point* c, void* arg, int error,
 847         struct comm_reply* reply_info)
 848 {
 849         struct module_qstate* q = (struct module_qstate*)arg;
 850         struct libworker* lw = (struct libworker*)q->env->worker;
 851         struct outbound_entry e;
 852         e.qstate = q;
 853         e.qsent = NULL;
 854
 855         if(error != 0) {
 856                 mesh_report_reply(lw->env->mesh, &e, reply_info, error);
 857                 return 0;
 858         }
 859         /* sanity check. */
 860         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 861                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 862                         LDNS_PACKET_QUERY
 863                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 864                 /* error becomes timeout for the module as if this reply
 865                  * never arrived. */
 866                 mesh_report_reply(lw->env->mesh, &e, reply_info,
 867                         NETEVENT_TIMEOUT);
 868                 return 0;
 869         }
 870         mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR);
 871         return 0;
 872 }
 873
 874 int
 875 libworker_handle_service_reply(struct comm_point* c, void* arg, int error,
 876         struct comm_reply* reply_info)
 877 {
 878         struct outbound_entry* e = (struct outbound_entry*)arg;
 879         struct libworker* lw = (struct libworker*)e->qstate->env->worker;
 880
 881         if(error != 0) {
 882                 mesh_report_reply(lw->env->mesh, e, reply_info, error);
 883                 return 0;
 884         }
 885         /* sanity check. */
 886         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 887                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 888                         LDNS_PACKET_QUERY
 889                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 890                 /* error becomes timeout for the module as if this reply
 891                  * never arrived. */
 892                 mesh_report_reply(lw->env->mesh, e, reply_info,
 893                         NETEVENT_TIMEOUT);
 894                 return 0;
 895         }
 896         mesh_report_reply(lw->env->mesh,  e, reply_info, NETEVENT_NOERROR);
 897         return 0;
 898 }
 899
 900 /* --- fake callbacks for fptr_wlist to work --- */
 901 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 902         uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
 903         int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
 904 {
 905         log_assert(0);
 906 }
 907
 908 int worker_handle_request(struct comm_point* ATTR_UNUSED(c),
 909         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 910         struct comm_reply* ATTR_UNUSED(repinfo))
 911 {
 912         log_assert(0);
 913         return 0;
 914 }
 915
 916 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c),
 917         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 918         struct comm_reply* ATTR_UNUSED(reply_info))
 919 {
 920         log_assert(0);
 921         return 0;
 922 }
 923
 924 int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
 925         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 926         struct comm_reply* ATTR_UNUSED(reply_info))
 927 {
 928         log_assert(0);
 929         return 0;
 930 }
 931
 932 int remote_accept_callback(struct comm_point* ATTR_UNUSED(c),
 933         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 934         struct comm_reply* ATTR_UNUSED(repinfo))
 935 {
 936         log_assert(0);
 937         return 0;
 938 }
 939
 940 int remote_control_callback(struct comm_point* ATTR_UNUSED(c),
 941         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 942         struct comm_reply* ATTR_UNUSED(repinfo))
 943 {
 944         log_assert(0);
 945         return 0;
 946 }
 947
 948 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg))
 949 {
 950         log_assert(0);
 951 }
 952
 953 struct outbound_entry* worker_send_query(uint8_t* ATTR_UNUSED(qname),
 954         size_t ATTR_UNUSED(qnamelen), uint16_t ATTR_UNUSED(qtype),
 955         uint16_t ATTR_UNUSED(qclass), uint16_t ATTR_UNUSED(flags),
 956         int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec),
 957         int ATTR_UNUSED(nocaps), struct sockaddr_storage* ATTR_UNUSED(addr),
 958         socklen_t ATTR_UNUSED(addrlen), uint8_t* ATTR_UNUSED(zone),
 959         size_t ATTR_UNUSED(zonelen), struct module_qstate* ATTR_UNUSED(q))
 960 {
 961         log_assert(0);
 962         return 0;
 963 }
 964
 965 void
 966 worker_alloc_cleanup(void* ATTR_UNUSED(arg))
 967 {
 968         log_assert(0);
 969 }
 970
 971 void worker_stat_timer_cb(void* ATTR_UNUSED(arg))
 972 {
 973         log_assert(0);
 974 }
 975
 976 void worker_probe_timer_cb(void* ATTR_UNUSED(arg))
 977 {
 978         log_assert(0);
 979 }
 980
 981 void worker_start_accept(void* ATTR_UNUSED(arg))
 982 {
 983         log_assert(0);
 984 }
 985
 986 void worker_stop_accept(void* ATTR_UNUSED(arg))
 987 {
 988         log_assert(0);
 989 }
 990
 991 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
 992 {
 993         log_assert(0);
 994         return 0;
 995 }
 996
 997 int
 998 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
 999 {
1000         log_assert(0);
1001         return 0;
1002 }
1003
1004 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1005 {
1006         log_assert(0);
1007         return 0;
1008 }
1009
1010 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg))
1011 {
1012         log_assert(0);
1013 }
1014
1015 #ifdef UB_ON_WINDOWS
1016 void
1017 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void*
1018         ATTR_UNUSED(arg)) {
1019         log_assert(0);
1020 }
1021
1022 void
1023 wsvc_cron_cb(void* ATTR_UNUSED(arg))
1024 {
1025         log_assert(0);
1026 }
1027 #endif /* UB_ON_WINDOWS */