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, &libworker_alloc_cleanup, w,
 236                 cfg->do_udp || cfg->udp_upstream_without_downstream, 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->add_sub = &mesh_add_sub;
 255         w->env->kill_sub = &mesh_state_delete;
 256         w->env->detect_cycle = &mesh_detect_cycle;
 257         comm_base_timept(w->base, &w->env->now, &w->env->now_tv);
 258         return w;
 259 }
 260
 261 struct libworker* libworker_create_event(struct ub_ctx* ctx,
 262         struct ub_event_base* eb)
 263 {
 264         return libworker_setup(ctx, 0, eb);
 265 }
 266
 267 /** handle cancel command for bg worker */
 268 static void
 269 handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len)
 270 {
 271         struct ctx_query* q;
 272         if(w->is_bg_thread) {
 273                 lock_basic_lock(&w->ctx->cfglock);
 274                 q = context_deserialize_cancel(w->ctx, buf, len);
 275                 lock_basic_unlock(&w->ctx->cfglock);
 276         } else {
 277                 q = context_deserialize_cancel(w->ctx, buf, len);
 278         }
 279         if(!q) {
 280                 /* probably simply lookup failed, i.e. the message had been
 281                  * processed and answered before the cancel arrived */
 282                 return;
 283         }
 284         q->cancelled = 1;
 285         free(buf);
 286 }
 287
 288 /** do control command coming into bg server */
 289 static void
 290 libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len)
 291 {
 292         switch(context_serial_getcmd(msg, len)) {
 293                 default:
 294                 case UB_LIBCMD_ANSWER:
 295                         log_err("unknown command for bg worker %d",
 296                                 (int)context_serial_getcmd(msg, len));
 297                         /* and fall through to quit */
 298                         /* fallthrough */
 299                 case UB_LIBCMD_QUIT:
 300                         free(msg);
 301                         comm_base_exit(w->base);
 302                         break;
 303                 case UB_LIBCMD_NEWQUERY:
 304                         handle_newq(w, msg, len);
 305                         break;
 306                 case UB_LIBCMD_CANCEL:
 307                         handle_cancel(w, msg, len);
 308                         break;
 309         }
 310 }
 311
 312 /** handle control command coming into server */
 313 void
 314 libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 315         uint8_t* msg, size_t len, int err, void* arg)
 316 {
 317         struct libworker* w = (struct libworker*)arg;
 318
 319         if(err != 0) {
 320                 free(msg);
 321                 /* it is of no use to go on, exit */
 322                 comm_base_exit(w->base);
 323                 return;
 324         }
 325         libworker_do_cmd(w, msg, len); /* also frees the buf */
 326 }
 327
 328 /** the background thread func */
 329 static void*
 330 libworker_dobg(void* arg)
 331 {
 332         /* setup */
 333         uint32_t m;
 334         struct libworker* w = (struct libworker*)arg;
 335         struct ub_ctx* ctx;
 336         if(!w) {
 337                 log_err("libunbound bg worker init failed, nomem");
 338                 return NULL;
 339         }
 340         ctx = w->ctx;
 341         log_thread_set(&w->thread_num);
 342 #ifdef THREADS_DISABLED
 343         /* we are forked */
 344         w->is_bg_thread = 0;
 345         /* close non-used parts of the pipes */
 346         tube_close_write(ctx->qq_pipe);
 347         tube_close_read(ctx->rr_pipe);
 348 #endif
 349         if(!tube_setup_bg_listen(ctx->qq_pipe, w->base,
 350                 libworker_handle_control_cmd, w)) {
 351                 log_err("libunbound bg worker init failed, no bglisten");
 352                 return NULL;
 353         }
 354         if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) {
 355                 log_err("libunbound bg worker init failed, no bgwrite");
 356                 return NULL;
 357         }
 358
 359         /* do the work */
 360         comm_base_dispatch(w->base);
 361
 362         /* cleanup */
 363         m = UB_LIBCMD_QUIT;
 364         tube_remove_bg_listen(w->ctx->qq_pipe);
 365         tube_remove_bg_write(w->ctx->rr_pipe);
 366         libworker_delete(w);
 367         (void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m,
 368                 (uint32_t)sizeof(m), 0);
 369 #ifdef THREADS_DISABLED
 370         /* close pipes from forked process before exit */
 371         tube_close_read(ctx->qq_pipe);
 372         tube_close_write(ctx->rr_pipe);
 373 #endif
 374         return NULL;
 375 }
 376
 377 int libworker_bg(struct ub_ctx* ctx)
 378 {
 379         struct libworker* w;
 380         /* fork or threadcreate */
 381         lock_basic_lock(&ctx->cfglock);
 382         if(ctx->dothread) {
 383                 lock_basic_unlock(&ctx->cfglock);
 384                 w = libworker_setup(ctx, 1, NULL);
 385                 if(!w) return UB_NOMEM;
 386                 w->is_bg_thread = 1;
 387 #ifdef ENABLE_LOCK_CHECKS
 388                 w->thread_num = 1; /* for nicer DEBUG checklocks */
 389 #endif
 390                 ub_thread_create(&ctx->bg_tid, libworker_dobg, w);
 391         } else {
 392                 lock_basic_unlock(&ctx->cfglock);
 393 #ifndef HAVE_FORK
 394                 /* no fork on windows */
 395                 return UB_FORKFAIL;
 396 #else /* HAVE_FORK */
 397                 switch((ctx->bg_pid=fork())) {
 398                         case 0:
 399                                 w = libworker_setup(ctx, 1, NULL);
 400                                 if(!w) fatal_exit("out of memory");
 401                                 /* close non-used parts of the pipes */
 402                                 tube_close_write(ctx->qq_pipe);
 403                                 tube_close_read(ctx->rr_pipe);
 404                                 (void)libworker_dobg(w);
 405                                 exit(0);
 406                                 break;
 407                         case -1:
 408                                 return UB_FORKFAIL;
 409                         default:
 410                                 /* close non-used parts, so that the worker
 411                                  * bgprocess gets 'pipe closed' when the
 412                                  * main process exits */
 413                                 tube_close_read(ctx->qq_pipe);
 414                                 tube_close_write(ctx->rr_pipe);
 415                                 break;
 416                 }
 417 #endif /* HAVE_FORK */
 418         }
 419         return UB_NOERROR;
 420 }
 421
 422 /** get msg reply struct (in temp region) */
 423 static struct reply_info*
 424 parse_reply(sldns_buffer* pkt, struct regional* region, struct query_info* qi)
 425 {
 426         struct reply_info* rep;
 427         struct msg_parse* msg;
 428         if(!(msg = regional_alloc(region, sizeof(*msg)))) {
 429                 return NULL;
 430         }
 431         memset(msg, 0, sizeof(*msg));
 432         sldns_buffer_set_position(pkt, 0);
 433         if(parse_packet(pkt, msg, region) != 0)
 434                 return 0;
 435         if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) {
 436                 return 0;
 437         }
 438         return rep;
 439 }
 440
 441 /** insert canonname */
 442 static int
 443 fill_canon(struct ub_result* res, uint8_t* s)
 444 {
 445         char buf[255+2];
 446         dname_str(s, buf);
 447         res->canonname = strdup(buf);
 448         return res->canonname != 0;
 449 }
 450
 451 /** fill data into result */
 452 static int
 453 fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer,
 454         uint8_t* finalcname, struct query_info* rq, struct reply_info* rep)
 455 {
 456         size_t i;
 457         struct packed_rrset_data* data;
 458         res->ttl = 0;
 459         if(!answer) {
 460                 if(finalcname) {
 461                         if(!fill_canon(res, finalcname))
 462                                 return 0; /* out of memory */
 463                 }
 464                 if(rep->rrset_count != 0)
 465                         res->ttl = (int)rep->ttl;
 466                 res->data = (char**)calloc(1, sizeof(char*));
 467                 res->len = (int*)calloc(1, sizeof(int));
 468                 return (res->data && res->len);
 469         }
 470         data = (struct packed_rrset_data*)answer->entry.data;
 471         if(query_dname_compare(rq->qname, answer->rk.dname) != 0) {
 472                 if(!fill_canon(res, answer->rk.dname))
 473                         return 0; /* out of memory */
 474         } else  res->canonname = NULL;
 475         res->data = (char**)calloc(data->count+1, sizeof(char*));
 476         res->len = (int*)calloc(data->count+1, sizeof(int));
 477         if(!res->data || !res->len)
 478                 return 0; /* out of memory */
 479         for(i=0; i<data->count; i++) {
 480                 /* remove rdlength from rdata */
 481                 res->len[i] = (int)(data->rr_len[i] - 2);
 482                 res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]);
 483                 if(!res->data[i])
 484                         return 0; /* out of memory */
 485         }
 486         /* ttl for positive answers, from CNAME and answer RRs */
 487         if(data->count != 0) {
 488                 size_t j;
 489                 res->ttl = (int)data->ttl;
 490                 for(j=0; j<rep->an_numrrsets; j++) {
 491                         struct packed_rrset_data* d =
 492                                 (struct packed_rrset_data*)rep->rrsets[j]->
 493                                 entry.data;
 494                         if((int)d->ttl < res->ttl)
 495                                 res->ttl = (int)d->ttl;
 496                 }
 497         }
 498         /* ttl for negative answers */
 499         if(data->count == 0 && rep->rrset_count != 0)
 500                 res->ttl = (int)rep->ttl;
 501         res->data[data->count] = NULL;
 502         res->len[data->count] = 0;
 503         return 1;
 504 }
 505
 506 /** fill result from parsed message, on error fills servfail */
 507 void
 508 libworker_enter_result(struct ub_result* res, sldns_buffer* buf,
 509         struct regional* temp, enum sec_status msg_security)
 510 {
 511         struct query_info rq;
 512         struct reply_info* rep;
 513         res->rcode = LDNS_RCODE_SERVFAIL;
 514         rep = parse_reply(buf, temp, &rq);
 515         if(!rep) {
 516                 log_err("cannot parse buf");
 517                 return; /* error parsing buf, or out of memory */
 518         }
 519         if(!fill_res(res, reply_find_answer_rrset(&rq, rep),
 520                 reply_find_final_cname_target(&rq, rep), &rq, rep))
 521                 return; /* out of memory */
 522         /* rcode, havedata, nxdomain, secure, bogus */
 523         res->rcode = (int)FLAGS_GET_RCODE(rep->flags);
 524         if(res->data && res->data[0])
 525                 res->havedata = 1;
 526         if(res->rcode == LDNS_RCODE_NXDOMAIN)
 527                 res->nxdomain = 1;
 528         if(msg_security == sec_status_secure)
 529                 res->secure = 1;
 530         if(msg_security == sec_status_bogus)
 531                 res->bogus = 1;
 532 }
 533
 534 /** fillup fg results */
 535 static void
 536 libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf,
 537         enum sec_status s, char* why_bogus)
 538 {
 539         if(why_bogus)
 540                 q->res->why_bogus = strdup(why_bogus);
 541         if(rcode != 0) {
 542                 q->res->rcode = rcode;
 543                 q->msg_security = s;
 544                 return;
 545         }
 546
 547         q->res->rcode = LDNS_RCODE_SERVFAIL;
 548         q->msg_security = 0;
 549         q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf));
 550         q->msg_len = sldns_buffer_limit(buf);
 551         if(!q->msg) {
 552                 return; /* the error is in the rcode */
 553         }
 554
 555         /* canonname and results */
 556         q->msg_security = s;
 557         libworker_enter_result(q->res, buf, q->w->env->scratch, s);
 558 }
 559
 560 void
 561 libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 562         char* why_bogus)
 563 {
 564         struct ctx_query* q = (struct ctx_query*)arg;
 565         /* fg query is done; exit comm base */
 566         comm_base_exit(q->w->base);
 567
 568         libworker_fillup_fg(q, rcode, buf, s, why_bogus);
 569 }
 570
 571 /** setup qinfo and edns */
 572 static int
 573 setup_qinfo_edns(struct libworker* w, struct ctx_query* q,
 574         struct query_info* qinfo, struct edns_data* edns)
 575 {
 576         qinfo->qtype = (uint16_t)q->res->qtype;
 577         qinfo->qclass = (uint16_t)q->res->qclass;
 578         qinfo->local_alias = NULL;
 579         qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len);
 580         if(!qinfo->qname) {
 581                 return 0;
 582         }
 583         qinfo->local_alias = NULL;
 584         edns->edns_present = 1;
 585         edns->ext_rcode = 0;
 586         edns->edns_version = 0;
 587         edns->bits = EDNS_DO;
 588         edns->opt_list = NULL;
 589         if(sldns_buffer_capacity(w->back->udp_buff) < 65535)
 590                 edns->udp_size = (uint16_t)sldns_buffer_capacity(
 591                         w->back->udp_buff);
 592         else    edns->udp_size = 65535;
 593         return 1;
 594 }
 595
 596 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)
 597 {
 598         struct libworker* w = libworker_setup(ctx, 0, NULL);
 599         uint16_t qflags, qid;
 600         struct query_info qinfo;
 601         struct edns_data edns;
 602         if(!w)
 603                 return UB_INITFAIL;
 604         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 605                 libworker_delete(w);
 606                 return UB_SYNTAX;
 607         }
 608         qid = 0;
 609         qflags = BIT_RD;
 610         q->w = w;
 611         /* see if there is a fixed answer */
 612         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 613         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 614         if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns,
 615                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 616                 NULL, 0, NULL, 0, NULL)) {
 617                 regional_free_all(w->env->scratch);
 618                 libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
 619                         w->back->udp_buff, sec_status_insecure, NULL);
 620                 libworker_delete(w);
 621                 free(qinfo.qname);
 622                 return UB_NOERROR;
 623         }
 624         /* process new query */
 625         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 626                 w->back->udp_buff, qid, libworker_fg_done_cb, q)) {
 627                 free(qinfo.qname);
 628                 return UB_NOMEM;
 629         }
 630         free(qinfo.qname);
 631
 632         /* wait for reply */
 633         comm_base_dispatch(w->base);
 634
 635         libworker_delete(w);
 636         return UB_NOERROR;
 637 }
 638
 639 void
 640 libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf,
 641         enum sec_status s, char* why_bogus)
 642 {
 643         struct ctx_query* q = (struct ctx_query*)arg;
 644         ub_event_callback_type cb = (ub_event_callback_type)q->cb;
 645         void* cb_arg = q->cb_arg;
 646         int cancelled = q->cancelled;
 647
 648         /* delete it now */
 649         struct ub_ctx* ctx = q->w->ctx;
 650         lock_basic_lock(&ctx->cfglock);
 651         (void)rbtree_delete(&ctx->queries, q->node.key);
 652         ctx->num_async--;
 653         context_query_delete(q);
 654         lock_basic_unlock(&ctx->cfglock);
 655
 656         if(!cancelled) {
 657                 /* call callback */
 658                 int sec = 0;
 659                 if(s == sec_status_bogus)
 660                         sec = 1;
 661                 else if(s == sec_status_secure)
 662                         sec = 2;
 663                 (*cb)(cb_arg, rcode, (void*)sldns_buffer_begin(buf),
 664                         (int)sldns_buffer_limit(buf), sec, why_bogus);
 665         }
 666 }
 667
 668 int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,
 669         int* async_id)
 670 {
 671         struct libworker* w = ctx->event_worker;
 672         uint16_t qflags, qid;
 673         struct query_info qinfo;
 674         struct edns_data edns;
 675         if(!w)
 676                 return UB_INITFAIL;
 677         if(!setup_qinfo_edns(w, q, &qinfo, &edns))
 678                 return UB_SYNTAX;
 679         qid = 0;
 680         qflags = BIT_RD;
 681         q->w = w;
 682         /* see if there is a fixed answer */
 683         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 684         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 685         if(local_zones_answer(ctx->local_zones, w->env, &qinfo, &edns,
 686                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 687                 NULL, 0, NULL, 0, NULL)) {
 688                 regional_free_all(w->env->scratch);
 689                 free(qinfo.qname);
 690                 libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
 691                         w->back->udp_buff, sec_status_insecure, NULL);
 692                 return UB_NOERROR;
 693         }
 694         /* process new query */
 695         if(async_id)
 696                 *async_id = q->querynum;
 697         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 698                 w->back->udp_buff, qid, libworker_event_done_cb, q)) {
 699                 free(qinfo.qname);
 700                 return UB_NOMEM;
 701         }
 702         free(qinfo.qname);
 703         return UB_NOERROR;
 704 }
 705
 706 /** add result to the bg worker result queue */
 707 static void
 708 add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt,
 709         int err, char* reason)
 710 {
 711         uint8_t* msg = NULL;
 712         uint32_t len = 0;
 713
 714         /* serialize and delete unneeded q */
 715         if(w->is_bg_thread) {
 716                 lock_basic_lock(&w->ctx->cfglock);
 717                 if(reason)
 718                         q->res->why_bogus = strdup(reason);
 719                 if(pkt) {
 720                         q->msg_len = sldns_buffer_remaining(pkt);
 721                         q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len);
 722                         if(!q->msg)
 723                                 msg = context_serialize_answer(q, UB_NOMEM,
 724                                 NULL, &len);
 725                         else    msg = context_serialize_answer(q, err,
 726                                 NULL, &len);
 727                 } else msg = context_serialize_answer(q, err, NULL, &len);
 728                 lock_basic_unlock(&w->ctx->cfglock);
 729         } else {
 730                 if(reason)
 731                         q->res->why_bogus = strdup(reason);
 732                 msg = context_serialize_answer(q, err, pkt, &len);
 733                 (void)rbtree_delete(&w->ctx->queries, q->node.key);
 734                 w->ctx->num_async--;
 735                 context_query_delete(q);
 736         }
 737
 738         if(!msg) {
 739                 log_err("out of memory for async answer");
 740                 return;
 741         }
 742         if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) {
 743                 log_err("out of memory for async answer");
 744                 return;
 745         }
 746 }
 747
 748 void
 749 libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
 750         char* why_bogus)
 751 {
 752         struct ctx_query* q = (struct ctx_query*)arg;
 753
 754         if(q->cancelled || q->w->back->want_to_quit) {
 755                 if(q->w->is_bg_thread) {
 756                         /* delete it now */
 757                         struct ub_ctx* ctx = q->w->ctx;
 758                         lock_basic_lock(&ctx->cfglock);
 759                         (void)rbtree_delete(&ctx->queries, q->node.key);
 760                         ctx->num_async--;
 761                         context_query_delete(q);
 762                         lock_basic_unlock(&ctx->cfglock);
 763                 }
 764                 /* cancelled, do not give answer */
 765                 return;
 766         }
 767         q->msg_security = s;
 768         if(!buf)
 769                 buf = q->w->env->scratch_buffer;
 770         if(rcode != 0) {
 771                 error_encode(buf, rcode, NULL, 0, BIT_RD, NULL);
 772         }
 773         add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus);
 774 }
 775
 776
 777 /** handle new query command for bg worker */
 778 static void
 779 handle_newq(struct libworker* w, uint8_t* buf, uint32_t len)
 780 {
 781         uint16_t qflags, qid;
 782         struct query_info qinfo;
 783         struct edns_data edns;
 784         struct ctx_query* q;
 785         if(w->is_bg_thread) {
 786                 lock_basic_lock(&w->ctx->cfglock);
 787                 q = context_lookup_new_query(w->ctx, buf, len);
 788                 lock_basic_unlock(&w->ctx->cfglock);
 789         } else {
 790                 q = context_deserialize_new_query(w->ctx, buf, len);
 791         }
 792         free(buf);
 793         if(!q) {
 794                 log_err("failed to deserialize newq");
 795                 return;
 796         }
 797         if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
 798                 add_bg_result(w, q, NULL, UB_SYNTAX, NULL);
 799                 return;
 800         }
 801         qid = 0;
 802         qflags = BIT_RD;
 803         /* see if there is a fixed answer */
 804         sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
 805         sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
 806         if(local_zones_answer(w->ctx->local_zones, w->env, &qinfo, &edns,
 807                 w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
 808                 NULL, 0, NULL, 0, NULL)) {
 809                 regional_free_all(w->env->scratch);
 810                 q->msg_security = sec_status_insecure;
 811                 add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL);
 812                 free(qinfo.qname);
 813                 return;
 814         }
 815         q->w = w;
 816         /* process new query */
 817         if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
 818                 w->back->udp_buff, qid, libworker_bg_done_cb, q)) {
 819                 add_bg_result(w, q, NULL, UB_NOMEM, NULL);
 820         }
 821         free(qinfo.qname);
 822 }
 823
 824 void libworker_alloc_cleanup(void* arg)
 825 {
 826         struct libworker* w = (struct libworker*)arg;
 827         slabhash_clear(&w->env->rrset_cache->table);
 828         slabhash_clear(w->env->msg_cache);
 829 }
 830
 831 struct outbound_entry* libworker_send_query(struct query_info* qinfo,
 832         uint16_t flags, int dnssec, int want_dnssec, int nocaps,
 833         struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
 834         size_t zonelen, int ssl_upstream, struct module_qstate* q)
 835 {
 836         struct libworker* w = (struct libworker*)q->env->worker;
 837         struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
 838                 q->region, sizeof(*e));
 839         if(!e)
 840                 return NULL;
 841         e->qstate = q;
 842         e->qsent = outnet_serviced_query(w->back, qinfo, flags, dnssec,
 843                 want_dnssec, nocaps, q->env->cfg->tcp_upstream, ssl_upstream,
 844                 addr, addrlen, zone, zonelen, q, libworker_handle_service_reply,
 845                 e, w->back->udp_buff, q->env);
 846         if(!e->qsent) {
 847                 return NULL;
 848         }
 849         return e;
 850 }
 851
 852 int
 853 libworker_handle_reply(struct comm_point* c, void* arg, int error,
 854         struct comm_reply* reply_info)
 855 {
 856         struct module_qstate* q = (struct module_qstate*)arg;
 857         struct libworker* lw = (struct libworker*)q->env->worker;
 858         struct outbound_entry e;
 859         e.qstate = q;
 860         e.qsent = NULL;
 861
 862         if(error != 0) {
 863                 mesh_report_reply(lw->env->mesh, &e, reply_info, error);
 864                 return 0;
 865         }
 866         /* sanity check. */
 867         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 868                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 869                         LDNS_PACKET_QUERY
 870                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 871                 /* error becomes timeout for the module as if this reply
 872                  * never arrived. */
 873                 mesh_report_reply(lw->env->mesh, &e, reply_info,
 874                         NETEVENT_TIMEOUT);
 875                 return 0;
 876         }
 877         mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR);
 878         return 0;
 879 }
 880
 881 int
 882 libworker_handle_service_reply(struct comm_point* c, void* arg, int error,
 883         struct comm_reply* reply_info)
 884 {
 885         struct outbound_entry* e = (struct outbound_entry*)arg;
 886         struct libworker* lw = (struct libworker*)e->qstate->env->worker;
 887
 888         if(error != 0) {
 889                 mesh_report_reply(lw->env->mesh, e, reply_info, error);
 890                 return 0;
 891         }
 892         /* sanity check. */
 893         if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
 894                 || LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
 895                         LDNS_PACKET_QUERY
 896                 || LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
 897                 /* error becomes timeout for the module as if this reply
 898                  * never arrived. */
 899                 mesh_report_reply(lw->env->mesh, e, reply_info,
 900                         NETEVENT_TIMEOUT);
 901                 return 0;
 902         }
 903         mesh_report_reply(lw->env->mesh,  e, reply_info, NETEVENT_NOERROR);
 904         return 0;
 905 }
 906
 907 /* --- fake callbacks for fptr_wlist to work --- */
 908 void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
 909         uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
 910         int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
 911 {
 912         log_assert(0);
 913 }
 914
 915 int worker_handle_request(struct comm_point* ATTR_UNUSED(c),
 916         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 917         struct comm_reply* ATTR_UNUSED(repinfo))
 918 {
 919         log_assert(0);
 920         return 0;
 921 }
 922
 923 int worker_handle_reply(struct comm_point* ATTR_UNUSED(c),
 924         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 925         struct comm_reply* ATTR_UNUSED(reply_info))
 926 {
 927         log_assert(0);
 928         return 0;
 929 }
 930
 931 int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
 932         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 933         struct comm_reply* ATTR_UNUSED(reply_info))
 934 {
 935         log_assert(0);
 936         return 0;
 937 }
 938
 939 int remote_accept_callback(struct comm_point* ATTR_UNUSED(c),
 940         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 941         struct comm_reply* ATTR_UNUSED(repinfo))
 942 {
 943         log_assert(0);
 944         return 0;
 945 }
 946
 947 int remote_control_callback(struct comm_point* ATTR_UNUSED(c),
 948         void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
 949         struct comm_reply* ATTR_UNUSED(repinfo))
 950 {
 951         log_assert(0);
 952         return 0;
 953 }
 954
 955 void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg))
 956 {
 957         log_assert(0);
 958 }
 959
 960 struct outbound_entry* worker_send_query(struct query_info* ATTR_UNUSED(qinfo),
 961         uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec),
 962         int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps),
 963         struct sockaddr_storage* ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen),
 964         uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen),
 965         int ATTR_UNUSED(ssl_upstream), struct module_qstate* ATTR_UNUSED(q))
 966 {
 967         log_assert(0);
 968         return 0;
 969 }
 970
 971 void
 972 worker_alloc_cleanup(void* ATTR_UNUSED(arg))
 973 {
 974         log_assert(0);
 975 }
 976
 977 void worker_stat_timer_cb(void* ATTR_UNUSED(arg))
 978 {
 979         log_assert(0);
 980 }
 981
 982 void worker_probe_timer_cb(void* ATTR_UNUSED(arg))
 983 {
 984         log_assert(0);
 985 }
 986
 987 void worker_start_accept(void* ATTR_UNUSED(arg))
 988 {
 989         log_assert(0);
 990 }
 991
 992 void worker_stop_accept(void* ATTR_UNUSED(arg))
 993 {
 994         log_assert(0);
 995 }
 996
 997 int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
 998 {
 999         log_assert(0);
1000         return 0;
1001 }
1002
1003 int
1004 codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1005 {
1006         log_assert(0);
1007         return 0;
1008 }
1009
1010 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
1011 {
1012         log_assert(0);
1013         return 0;
1014 }
1015
1016 void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg))
1017 {
1018         log_assert(0);
1019 }
1020
1021 #ifdef UB_ON_WINDOWS
1022 void
1023 worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void*
1024         ATTR_UNUSED(arg)) {
1025         log_assert(0);
1026 }
1027
1028 void
1029 wsvc_cron_cb(void* ATTR_UNUSED(arg))
1030 {
1031         log_assert(0);
1032 }
1033 #endif /* UB_ON_WINDOWS */