contrib/unbound/daemon/daemon.c

   1 /*
   2  * daemon/daemon.c - collection of workers that handles requests.
   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  * The daemon consists of global settings and a number of workers.
  40  */
  41
  42 #include "config.h"
  43 #ifdef HAVE_OPENSSL_ERR_H
  44 #include <openssl/err.h>
  45 #endif
  46
  47 #ifdef HAVE_OPENSSL_RAND_H
  48 #include <openssl/rand.h>
  49 #endif
  50
  51 #ifdef HAVE_OPENSSL_CONF_H
  52 #include <openssl/conf.h>
  53 #endif
  54
  55 #ifdef HAVE_OPENSSL_ENGINE_H
  56 #include <openssl/engine.h>
  57 #endif
  58
  59 #ifdef HAVE_TIME_H
  60 #include <time.h>
  61 #endif
  62 #include <sys/time.h>
  63
  64 #ifdef HAVE_NSS
  65 /* nss3 */
  66 #include "nss.h"
  67 #endif
  68
  69 #include "daemon/daemon.h"
  70 #include "daemon/worker.h"
  71 #include "daemon/remote.h"
  72 #include "daemon/acl_list.h"
  73 #include "util/log.h"
  74 #include "util/config_file.h"
  75 #include "util/data/msgreply.h"
  76 #include "util/shm_side/shm_main.h"
  77 #include "util/storage/lookup3.h"
  78 #include "util/storage/slabhash.h"
  79 #include "services/listen_dnsport.h"
  80 #include "services/cache/rrset.h"
  81 #include "services/cache/infra.h"
  82 #include "services/localzone.h"
  83 #include "services/view.h"
  84 #include "services/modstack.h"
  85 #include "util/module.h"
  86 #include "util/random.h"
  87 #include "util/tube.h"
  88 #include "util/net_help.h"
  89 #include "sldns/keyraw.h"
  90 #include "respip/respip.h"
  91 #include <signal.h>
  92
  93 #ifdef HAVE_SYSTEMD
  94 #include <systemd/sd-daemon.h>
  95 #endif
  96
  97 /** How many quit requests happened. */
  98 static int sig_record_quit = 0;
  99 /** How many reload requests happened. */
 100 static int sig_record_reload = 0;
 101
 102 #if HAVE_DECL_SSL_COMP_GET_COMPRESSION_METHODS
 103 /** cleaner ssl memory freeup */
 104 static void* comp_meth = NULL;
 105 #endif
 106 #ifdef LEX_HAS_YYLEX_DESTROY
 107 /** remove buffers for parsing and init */
 108 int ub_c_lex_destroy(void);
 109 #endif
 110
 111 /** used when no other sighandling happens, so we don't die
 112   * when multiple signals in quick succession are sent to us.
 113   * @param sig: signal number.
 114   * @return signal handler return type (void or int).
 115   */
 116 static RETSIGTYPE record_sigh(int sig)
 117 {
 118 #ifdef LIBEVENT_SIGNAL_PROBLEM
 119         /* cannot log, verbose here because locks may be held */
 120         /* quit on signal, no cleanup and statistics,
 121            because installed libevent version is not threadsafe */
 122         exit(0);
 123 #endif
 124         switch(sig)
 125         {
 126                 case SIGTERM:
 127 #ifdef SIGQUIT
 128                 case SIGQUIT:
 129 #endif
 130 #ifdef SIGBREAK
 131                 case SIGBREAK:
 132 #endif
 133                 case SIGINT:
 134                         sig_record_quit++;
 135                         break;
 136 #ifdef SIGHUP
 137                 case SIGHUP:
 138                         sig_record_reload++;
 139                         break;
 140 #endif
 141 #ifdef SIGPIPE
 142                 case SIGPIPE:
 143                         break;
 144 #endif
 145                 default:
 146                         /* ignoring signal */
 147                         break;
 148         }
 149 }
 150
 151 /**
 152  * Signal handling during the time when netevent is disabled.
 153  * Stores signals to replay later.
 154  */
 155 static void
 156 signal_handling_record(void)
 157 {
 158         if( signal(SIGTERM, record_sigh) == SIG_ERR ||
 159 #ifdef SIGQUIT
 160                 signal(SIGQUIT, record_sigh) == SIG_ERR ||
 161 #endif
 162 #ifdef SIGBREAK
 163                 signal(SIGBREAK, record_sigh) == SIG_ERR ||
 164 #endif
 165 #ifdef SIGHUP
 166                 signal(SIGHUP, record_sigh) == SIG_ERR ||
 167 #endif
 168 #ifdef SIGPIPE
 169                 signal(SIGPIPE, SIG_IGN) == SIG_ERR ||
 170 #endif
 171                 signal(SIGINT, record_sigh) == SIG_ERR
 172                 )
 173                 log_err("install sighandler: %s", strerror(errno));
 174 }
 175
 176 /**
 177  * Replay old signals.
 178  * @param wrk: worker that handles signals.
 179  */
 180 static void
 181 signal_handling_playback(struct worker* wrk)
 182 {
 183 #ifdef SIGHUP
 184         if(sig_record_reload) {
 185 # ifdef HAVE_SYSTEMD
 186                 sd_notify(0, "RELOADING=1");
 187 # endif
 188                 worker_sighandler(SIGHUP, wrk);
 189 # ifdef HAVE_SYSTEMD
 190                 sd_notify(0, "READY=1");
 191 # endif
 192         }
 193 #endif
 194         if(sig_record_quit)
 195                 worker_sighandler(SIGTERM, wrk);
 196         sig_record_quit = 0;
 197         sig_record_reload = 0;
 198 }
 199
 200 struct daemon*
 201 daemon_init(void)
 202 {
 203         struct daemon* daemon = (struct daemon*)calloc(1,
 204                 sizeof(struct daemon));
 205 #ifdef USE_WINSOCK
 206         int r;
 207         WSADATA wsa_data;
 208 #endif
 209         if(!daemon)
 210                 return NULL;
 211 #ifdef USE_WINSOCK
 212         r = WSAStartup(MAKEWORD(2,2), &wsa_data);
 213         if(r != 0) {
 214                 fatal_exit("could not init winsock. WSAStartup: %s",
 215                         wsa_strerror(r));
 216         }
 217 #endif /* USE_WINSOCK */
 218         signal_handling_record();
 219         checklock_start();
 220 #ifdef HAVE_SSL
 221 #  ifdef HAVE_ERR_LOAD_CRYPTO_STRINGS
 222         ERR_load_crypto_strings();
 223 #  endif
 224 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
 225         ERR_load_SSL_strings();
 226 #endif
 227 #  ifdef USE_GOST
 228         (void)sldns_key_EVP_load_gost_id();
 229 #  endif
 230 #  if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO)
 231         OpenSSL_add_all_algorithms();
 232 #  else
 233         OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
 234                 | OPENSSL_INIT_ADD_ALL_DIGESTS
 235                 | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 236 #  endif
 237 #  if HAVE_DECL_SSL_COMP_GET_COMPRESSION_METHODS
 238         /* grab the COMP method ptr because openssl leaks it */
 239         comp_meth = (void*)SSL_COMP_get_compression_methods();
 240 #  endif
 241 #  if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
 242         (void)SSL_library_init();
 243 #  else
 244         (void)OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
 245 #  endif
 246 #  if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
 247         if(!ub_openssl_lock_init())
 248                 fatal_exit("could not init openssl locks");
 249 #  endif
 250 #elif defined(HAVE_NSS)
 251         if(NSS_NoDB_Init(NULL) != SECSuccess)
 252                 fatal_exit("could not init NSS");
 253 #endif /* HAVE_SSL or HAVE_NSS */
 254 #ifdef HAVE_TZSET
 255         /* init timezone info while we are not chrooted yet */
 256         tzset();
 257 #endif
 258         /* open /dev/random if needed */
 259         ub_systemseed((unsigned)time(NULL)^(unsigned)getpid()^0xe67);
 260         daemon->need_to_exit = 0;
 261         modstack_init(&daemon->mods);
 262         if(!(daemon->env = (struct module_env*)calloc(1,
 263                 sizeof(*daemon->env)))) {
 264                 free(daemon);
 265                 return NULL;
 266         }
 267         /* init edns_known_options */
 268         if(!edns_known_options_init(daemon->env)) {
 269                 free(daemon->env);
 270                 free(daemon);
 271                 return NULL;
 272         }
 273         alloc_init(&daemon->superalloc, NULL, 0);
 274         daemon->acl = acl_list_create();
 275         if(!daemon->acl) {
 276                 edns_known_options_delete(daemon->env);
 277                 free(daemon->env);
 278                 free(daemon);
 279                 return NULL;
 280         }
 281         if(gettimeofday(&daemon->time_boot, NULL) < 0)
 282                 log_err("gettimeofday: %s", strerror(errno));
 283         daemon->time_last_stat = daemon->time_boot;
 284         return daemon;
 285 }
 286
 287 int
 288 daemon_open_shared_ports(struct daemon* daemon)
 289 {
 290         log_assert(daemon);
 291         if(daemon->cfg->port != daemon->listening_port) {
 292                 size_t i;
 293                 struct listen_port* p0;
 294                 daemon->reuseport = 0;
 295                 /* free and close old ports */
 296                 if(daemon->ports != NULL) {
 297                         for(i=0; i<daemon->num_ports; i++)
 298                                 listening_ports_free(daemon->ports[i]);
 299                         free(daemon->ports);
 300                         daemon->ports = NULL;
 301                 }
 302                 /* see if we want to reuseport */
 303 #ifdef SO_REUSEPORT
 304                 if(daemon->cfg->so_reuseport && daemon->cfg->num_threads > 0)
 305                         daemon->reuseport = 1;
 306 #endif
 307                 /* try to use reuseport */
 308                 p0 = listening_ports_open(daemon->cfg, &daemon->reuseport);
 309                 if(!p0) {
 310                         listening_ports_free(p0);
 311                         return 0;
 312                 }
 313                 if(daemon->reuseport) {
 314                         /* reuseport was successful, allocate for it */
 315                         daemon->num_ports = (size_t)daemon->cfg->num_threads;
 316                 } else {
 317                         /* do the normal, singleportslist thing,
 318                          * reuseport not enabled or did not work */
 319                         daemon->num_ports = 1;
 320                 }
 321                 if(!(daemon->ports = (struct listen_port**)calloc(
 322                         daemon->num_ports, sizeof(*daemon->ports)))) {
 323                         listening_ports_free(p0);
 324                         return 0;
 325                 }
 326                 daemon->ports[0] = p0;
 327                 if(daemon->reuseport) {
 328                         /* continue to use reuseport */
 329                         for(i=1; i<daemon->num_ports; i++) {
 330                                 if(!(daemon->ports[i]=
 331                                         listening_ports_open(daemon->cfg,
 332                                                 &daemon->reuseport))
 333                                         || !daemon->reuseport ) {
 334                                         for(i=0; i<daemon->num_ports; i++)
 335                                                 listening_ports_free(daemon->ports[i]);
 336                                         free(daemon->ports);
 337                                         daemon->ports = NULL;
 338                                         return 0;
 339                                 }
 340                         }
 341                 }
 342                 daemon->listening_port = daemon->cfg->port;
 343         }
 344         if(!daemon->cfg->remote_control_enable && daemon->rc_port) {
 345                 listening_ports_free(daemon->rc_ports);
 346                 daemon->rc_ports = NULL;
 347                 daemon->rc_port = 0;
 348         }
 349         if(daemon->cfg->remote_control_enable &&
 350                 daemon->cfg->control_port != daemon->rc_port) {
 351                 listening_ports_free(daemon->rc_ports);
 352                 if(!(daemon->rc_ports=daemon_remote_open_ports(daemon->cfg)))
 353                         return 0;
 354                 daemon->rc_port = daemon->cfg->control_port;
 355         }
 356         return 1;
 357 }
 358
 359 /**
 360  * Setup modules. setup module stack.
 361  * @param daemon: the daemon
 362  */
 363 static void daemon_setup_modules(struct daemon* daemon)
 364 {
 365         daemon->env->cfg = daemon->cfg;
 366         daemon->env->alloc = &daemon->superalloc;
 367         daemon->env->worker = NULL;
 368         daemon->env->need_to_validate = 0; /* set by module init below */
 369         if(!modstack_setup(&daemon->mods, daemon->cfg->module_conf,
 370                 daemon->env)) {
 371                 fatal_exit("failed to setup modules");
 372         }
 373         log_edns_known_options(VERB_ALGO, daemon->env);
 374 }
 375
 376 /**
 377  * Obtain allowed port numbers, concatenate the list, and shuffle them
 378  * (ready to be handed out to threads).
 379  * @param daemon: the daemon. Uses rand and cfg.
 380  * @param shufport: the portlist output.
 381  * @return number of ports available.
 382  */
 383 static int daemon_get_shufport(struct daemon* daemon, int* shufport)
 384 {
 385         int i, n, k, temp;
 386         int avail = 0;
 387         for(i=0; i<65536; i++) {
 388                 if(daemon->cfg->outgoing_avail_ports[i]) {
 389                         shufport[avail++] = daemon->cfg->
 390                                 outgoing_avail_ports[i];
 391                 }
 392         }
 393         if(avail == 0)
 394                 fatal_exit("no ports are permitted for UDP, add "
 395                         "with outgoing-port-permit");
 396         /* Knuth shuffle */
 397         n = avail;
 398         while(--n > 0) {
 399                 k = ub_random_max(daemon->rand, n+1); /* 0<= k<= n */
 400                 temp = shufport[k];
 401                 shufport[k] = shufport[n];
 402                 shufport[n] = temp;
 403         }
 404         return avail;
 405 }
 406
 407 /**
 408  * Allocate empty worker structures. With backptr and thread-number,
 409  * from 0..numthread initialised. Used as user arguments to new threads.
 410  * Creates the daemon random generator if it does not exist yet.
 411  * The random generator stays existing between reloads with a unique state.
 412  * @param daemon: the daemon with (new) config settings.
 413  */
 414 static void
 415 daemon_create_workers(struct daemon* daemon)
 416 {
 417         int i, numport;
 418         int* shufport;
 419         log_assert(daemon && daemon->cfg);
 420         if(!daemon->rand) {
 421                 unsigned int seed = (unsigned int)time(NULL) ^
 422                         (unsigned int)getpid() ^ 0x438;
 423                 daemon->rand = ub_initstate(seed, NULL);
 424                 if(!daemon->rand)
 425                         fatal_exit("could not init random generator");
 426                 hash_set_raninit((uint32_t)ub_random(daemon->rand));
 427         }
 428         shufport = (int*)calloc(65536, sizeof(int));
 429         if(!shufport)
 430                 fatal_exit("out of memory during daemon init");
 431         numport = daemon_get_shufport(daemon, shufport);
 432         verbose(VERB_ALGO, "total of %d outgoing ports available", numport);
 433
 434         daemon->num = (daemon->cfg->num_threads?daemon->cfg->num_threads:1);
 435         if(daemon->reuseport && (int)daemon->num < (int)daemon->num_ports) {
 436                 log_warn("cannot reduce num-threads to %d because so-reuseport "
 437                         "so continuing with %d threads.", (int)daemon->num,
 438                         (int)daemon->num_ports);
 439                 daemon->num = (int)daemon->num_ports;
 440         }
 441         daemon->workers = (struct worker**)calloc((size_t)daemon->num,
 442                 sizeof(struct worker*));
 443         if(!daemon->workers)
 444                 fatal_exit("out of memory during daemon init");
 445         if(daemon->cfg->dnstap) {
 446 #ifdef USE_DNSTAP
 447                 daemon->dtenv = dt_create(daemon->cfg->dnstap_socket_path,
 448                         (unsigned int)daemon->num);
 449                 if (!daemon->dtenv)
 450                         fatal_exit("dt_create failed");
 451                 dt_apply_cfg(daemon->dtenv, daemon->cfg);
 452 #else
 453                 fatal_exit("dnstap enabled in config but not built with dnstap support");
 454 #endif
 455         }
 456         for(i=0; i<daemon->num; i++) {
 457                 if(!(daemon->workers[i] = worker_create(daemon, i,
 458                         shufport+numport*i/daemon->num,
 459                         numport*(i+1)/daemon->num - numport*i/daemon->num)))
 460                         /* the above is not ports/numthr, due to rounding */
 461                         fatal_exit("could not create worker");
 462         }
 463         free(shufport);
 464 }
 465
 466 #ifdef THREADS_DISABLED
 467 /**
 468  * Close all pipes except for the numbered thread.
 469  * @param daemon: daemon to close pipes in.
 470  * @param thr: thread number 0..num-1 of thread to skip.
 471  */
 472 static void close_other_pipes(struct daemon* daemon, int thr)
 473 {
 474         int i;
 475         for(i=0; i<daemon->num; i++)
 476                 if(i!=thr) {
 477                         if(i==0) {
 478                                 /* only close read part, need to write stats */
 479                                 tube_close_read(daemon->workers[i]->cmd);
 480                         } else {
 481                                 /* complete close channel to others */
 482                                 tube_delete(daemon->workers[i]->cmd);
 483                                 daemon->workers[i]->cmd = NULL;
 484                         }
 485                 }
 486 }
 487 #endif /* THREADS_DISABLED */
 488
 489 /**
 490  * Function to start one thread.
 491  * @param arg: user argument.
 492  * @return: void* user return value could be used for thread_join results.
 493  */
 494 static void*
 495 thread_start(void* arg)
 496 {
 497         struct worker* worker = (struct worker*)arg;
 498         int port_num = 0;
 499         log_thread_set(&worker->thread_num);
 500         ub_thread_blocksigs();
 501 #ifdef THREADS_DISABLED
 502         /* close pipe ends used by main */
 503         tube_close_write(worker->cmd);
 504         close_other_pipes(worker->daemon, worker->thread_num);
 505 #endif
 506 #ifdef SO_REUSEPORT
 507         if(worker->daemon->cfg->so_reuseport)
 508                 port_num = worker->thread_num % worker->daemon->num_ports;
 509         else
 510                 port_num = 0;
 511 #endif
 512         if(!worker_init(worker, worker->daemon->cfg,
 513                         worker->daemon->ports[port_num], 0))
 514                 fatal_exit("Could not initialize thread");
 515
 516         worker_work(worker);
 517         return NULL;
 518 }
 519
 520 /**
 521  * Fork and init the other threads. Main thread returns for special handling.
 522  * @param daemon: the daemon with other threads to fork.
 523  */
 524 static void
 525 daemon_start_others(struct daemon* daemon)
 526 {
 527         int i;
 528         log_assert(daemon);
 529         verbose(VERB_ALGO, "start threads");
 530         /* skip i=0, is this thread */
 531         for(i=1; i<daemon->num; i++) {
 532                 ub_thread_create(&daemon->workers[i]->thr_id,
 533                         thread_start, daemon->workers[i]);
 534 #ifdef THREADS_DISABLED
 535                 /* close pipe end of child */
 536                 tube_close_read(daemon->workers[i]->cmd);
 537 #endif /* no threads */
 538         }
 539 }
 540
 541 /**
 542  * Stop the other threads.
 543  * @param daemon: the daemon with other threads.
 544  */
 545 static void
 546 daemon_stop_others(struct daemon* daemon)
 547 {
 548         int i;
 549         log_assert(daemon);
 550         verbose(VERB_ALGO, "stop threads");
 551         /* skip i=0, is this thread */
 552         /* use i=0 buffer for sending cmds; because we are #0 */
 553         for(i=1; i<daemon->num; i++) {
 554                 worker_send_cmd(daemon->workers[i], worker_cmd_quit);
 555         }
 556         /* wait for them to quit */
 557         for(i=1; i<daemon->num; i++) {
 558                 /* join it to make sure its dead */
 559                 verbose(VERB_ALGO, "join %d", i);
 560                 ub_thread_join(daemon->workers[i]->thr_id);
 561                 verbose(VERB_ALGO, "join success %d", i);
 562         }
 563 }
 564
 565 void
 566 daemon_fork(struct daemon* daemon)
 567 {
 568         int have_view_respip_cfg = 0;
 569
 570         log_assert(daemon);
 571         if(!(daemon->views = views_create()))
 572                 fatal_exit("Could not create views: out of memory");
 573         /* create individual views and their localzone/data trees */
 574         if(!views_apply_cfg(daemon->views, daemon->cfg))
 575                 fatal_exit("Could not set up views");
 576
 577         if(!acl_list_apply_cfg(daemon->acl, daemon->cfg, daemon->views))
 578                 fatal_exit("Could not setup access control list");
 579         if(daemon->cfg->dnscrypt) {
 580 #ifdef USE_DNSCRYPT
 581                 daemon->dnscenv = dnsc_create();
 582                 if (!daemon->dnscenv)
 583                         fatal_exit("dnsc_create failed");
 584                 dnsc_apply_cfg(daemon->dnscenv, daemon->cfg);
 585 #else
 586                 fatal_exit("dnscrypt enabled in config but unbound was not built with "
 587                                    "dnscrypt support");
 588 #endif
 589         }
 590         /* create global local_zones */
 591         if(!(daemon->local_zones = local_zones_create()))
 592                 fatal_exit("Could not create local zones: out of memory");
 593         if(!local_zones_apply_cfg(daemon->local_zones, daemon->cfg))
 594                 fatal_exit("Could not set up local zones");
 595
 596         /* process raw response-ip configuration data */
 597         if(!(daemon->respip_set = respip_set_create()))
 598                 fatal_exit("Could not create response IP set");
 599         if(!respip_global_apply_cfg(daemon->respip_set, daemon->cfg))
 600                 fatal_exit("Could not set up response IP set");
 601         if(!respip_views_apply_cfg(daemon->views, daemon->cfg,
 602                 &have_view_respip_cfg))
 603                 fatal_exit("Could not set up per-view response IP sets");
 604         daemon->use_response_ip = !respip_set_is_empty(daemon->respip_set) ||
 605                 have_view_respip_cfg;
 606
 607         /* setup modules */
 608         daemon_setup_modules(daemon);
 609
 610         /* response-ip-xxx options don't work as expected without the respip
 611          * module.  To avoid run-time operational surprise we reject such
 612          * configuration. */
 613         if(daemon->use_response_ip &&
 614                 modstack_find(&daemon->mods, "respip") < 0)
 615                 fatal_exit("response-ip options require respip module");
 616
 617         /* first create all the worker structures, so we can pass
 618          * them to the newly created threads.
 619          */
 620         daemon_create_workers(daemon);
 621
 622 #if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
 623         /* in libev the first inited base gets signals */
 624         if(!worker_init(daemon->workers[0], daemon->cfg, daemon->ports[0], 1))
 625                 fatal_exit("Could not initialize main thread");
 626 #endif
 627
 628         /* Now create the threads and init the workers.
 629          * By the way, this is thread #0 (the main thread).
 630          */
 631         daemon_start_others(daemon);
 632
 633         /* Special handling for the main thread. This is the thread
 634          * that handles signals and remote control.
 635          */
 636 #if !(defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP))
 637         /* libevent has the last inited base get signals (or any base) */
 638         if(!worker_init(daemon->workers[0], daemon->cfg, daemon->ports[0], 1))
 639                 fatal_exit("Could not initialize main thread");
 640 #endif
 641         signal_handling_playback(daemon->workers[0]);
 642
 643         if (!shm_main_init(daemon))
 644                 log_warn("SHM has failed");
 645
 646         /* Start resolver service on main thread. */
 647 #ifdef HAVE_SYSTEMD
 648         sd_notify(0, "READY=1");
 649 #endif
 650         log_info("start of service (%s).", PACKAGE_STRING);
 651         worker_work(daemon->workers[0]);
 652 #ifdef HAVE_SYSTEMD
 653         sd_notify(0, "STOPPING=1");
 654 #endif
 655         log_info("service stopped (%s).", PACKAGE_STRING);
 656
 657         /* we exited! a signal happened! Stop other threads */
 658         daemon_stop_others(daemon);
 659
 660         /* Shutdown SHM */
 661         shm_main_shutdown(daemon);
 662
 663         daemon->need_to_exit = daemon->workers[0]->need_to_exit;
 664 }
 665
 666 void
 667 daemon_cleanup(struct daemon* daemon)
 668 {
 669         int i;
 670         log_assert(daemon);
 671         /* before stopping main worker, handle signals ourselves, so we
 672            don't die on multiple reload signals for example. */
 673         signal_handling_record();
 674         log_thread_set(NULL);
 675         /* clean up caches because
 676          * a) RRset IDs will be recycled after a reload, causing collisions
 677          * b) validation config can change, thus rrset, msg, keycache clear */
 678         slabhash_clear(&daemon->env->rrset_cache->table);
 679         slabhash_clear(daemon->env->msg_cache);
 680         local_zones_delete(daemon->local_zones);
 681         daemon->local_zones = NULL;
 682         respip_set_delete(daemon->respip_set);
 683         daemon->respip_set = NULL;
 684         views_delete(daemon->views);
 685         daemon->views = NULL;
 686         /* key cache is cleared by module desetup during next daemon_fork() */
 687         daemon_remote_clear(daemon->rc);
 688         for(i=0; i<daemon->num; i++)
 689                 worker_delete(daemon->workers[i]);
 690         free(daemon->workers);
 691         daemon->workers = NULL;
 692         daemon->num = 0;
 693 #ifdef USE_DNSTAP
 694         dt_delete(daemon->dtenv);
 695 #endif
 696 #ifdef USE_DNSCRYPT
 697         dnsc_delete(daemon->dnscenv);
 698 #endif
 699         daemon->cfg = NULL;
 700 }
 701
 702 void
 703 daemon_delete(struct daemon* daemon)
 704 {
 705         size_t i;
 706         if(!daemon)
 707                 return;
 708         modstack_desetup(&daemon->mods, daemon->env);
 709         daemon_remote_delete(daemon->rc);
 710         for(i = 0; i < daemon->num_ports; i++)
 711                 listening_ports_free(daemon->ports[i]);
 712         free(daemon->ports);
 713         listening_ports_free(daemon->rc_ports);
 714         if(daemon->env) {
 715                 slabhash_delete(daemon->env->msg_cache);
 716                 rrset_cache_delete(daemon->env->rrset_cache);
 717                 infra_delete(daemon->env->infra_cache);
 718                 edns_known_options_delete(daemon->env);
 719         }
 720         ub_randfree(daemon->rand);
 721         alloc_clear(&daemon->superalloc);
 722         acl_list_delete(daemon->acl);
 723         free(daemon->chroot);
 724         free(daemon->pidfile);
 725         free(daemon->env);
 726 #ifdef HAVE_SSL
 727         SSL_CTX_free((SSL_CTX*)daemon->listen_sslctx);
 728         SSL_CTX_free((SSL_CTX*)daemon->connect_sslctx);
 729 #endif
 730         free(daemon);
 731 #ifdef LEX_HAS_YYLEX_DESTROY
 732         /* lex cleanup */
 733         ub_c_lex_destroy();
 734 #endif
 735         /* libcrypto cleanup */
 736 #ifdef HAVE_SSL
 737 #  if defined(USE_GOST) && defined(HAVE_LDNS_KEY_EVP_UNLOAD_GOST)
 738         sldns_key_EVP_unload_gost();
 739 #  endif
 740 #  if HAVE_DECL_SSL_COMP_GET_COMPRESSION_METHODS && HAVE_DECL_SK_SSL_COMP_POP_FREE
 741 #    ifndef S_SPLINT_S
 742 #      if OPENSSL_VERSION_NUMBER < 0x10100000
 743         sk_SSL_COMP_pop_free(comp_meth, (void(*)())CRYPTO_free);
 744 #      endif
 745 #    endif
 746 #  endif
 747 #  ifdef HAVE_OPENSSL_CONFIG
 748         EVP_cleanup();
 749 #  if OPENSSL_VERSION_NUMBER < 0x10100000
 750         ENGINE_cleanup();
 751 #  endif
 752         CONF_modules_free();
 753 #  endif
 754 #  ifdef HAVE_CRYPTO_CLEANUP_ALL_EX_DATA
 755         CRYPTO_cleanup_all_ex_data(); /* safe, no more threads right now */
 756 #  endif
 757 #  ifdef HAVE_ERR_FREE_STRINGS
 758         ERR_free_strings();
 759 #  endif
 760 #  if OPENSSL_VERSION_NUMBER < 0x10100000
 761         RAND_cleanup();
 762 #  endif
 763 #  if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
 764         ub_openssl_lock_delete();
 765 #  endif
 766 #elif defined(HAVE_NSS)
 767         NSS_Shutdown();
 768 #endif /* HAVE_SSL or HAVE_NSS */
 769         checklock_stop();
 770 #ifdef USE_WINSOCK
 771         if(WSACleanup() != 0) {
 772                 log_err("Could not WSACleanup: %s",
 773                         wsa_strerror(WSAGetLastError()));
 774         }
 775 #endif
 776 }
 777
 778 void daemon_apply_cfg(struct daemon* daemon, struct config_file* cfg)
 779 {
 780         daemon->cfg = cfg;
 781         config_apply(cfg);
 782         if(!daemon->env->msg_cache ||
 783            cfg->msg_cache_size != slabhash_get_size(daemon->env->msg_cache) ||
 784            cfg->msg_cache_slabs != daemon->env->msg_cache->size) {
 785                 slabhash_delete(daemon->env->msg_cache);
 786                 daemon->env->msg_cache = slabhash_create(cfg->msg_cache_slabs,
 787                         HASH_DEFAULT_STARTARRAY, cfg->msg_cache_size,
 788                         msgreply_sizefunc, query_info_compare,
 789                         query_entry_delete, reply_info_delete, NULL);
 790                 if(!daemon->env->msg_cache) {
 791                         fatal_exit("malloc failure updating config settings");
 792                 }
 793         }
 794         if((daemon->env->rrset_cache = rrset_cache_adjust(
 795                 daemon->env->rrset_cache, cfg, &daemon->superalloc)) == 0)
 796                 fatal_exit("malloc failure updating config settings");
 797         if((daemon->env->infra_cache = infra_adjust(daemon->env->infra_cache,
 798                 cfg))==0)
 799                 fatal_exit("malloc failure updating config settings");
 800 }