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