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