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 "util/tcp_conn_limit.h"
80 #include "util/edns.h"
81 #include "services/listen_dnsport.h"
82 #include "services/cache/rrset.h"
83 #include "services/cache/infra.h"
84 #include "services/localzone.h"
85 #include "services/view.h"
86 #include "services/modstack.h"
87 #include "services/authzone.h"
88 #include "util/module.h"
89 #include "util/random.h"
90 #include "util/tube.h"
91 #include "util/net_help.h"
92 #include "sldns/keyraw.h"
93 #include "respip/respip.h"
94 #include "iterator/iter_fwd.h"
95 #include "iterator/iter_hints.h"
96 #include <signal.h>
97
98 #ifdef HAVE_SYSTEMD
99 #include <systemd/sd-daemon.h>
100 #endif
101 #ifdef HAVE_NETDB_H
102 #include <netdb.h>
103 #endif
104 #ifdef USE_CACHEDB
105 #include "cachedb/cachedb.h"
106 #endif
107
108 /** How many quit requests happened. */
109 static int sig_record_quit = 0;
110 /** How many reload requests happened. */
111 static int sig_record_reload = 0;
112
113 #if HAVE_DECL_SSL_COMP_GET_COMPRESSION_METHODS
114 /** cleaner ssl memory freeup */
115 static void* comp_meth = NULL;
116 #endif
117 /** remove buffers for parsing and init */
118 int ub_c_lex_destroy(void);
119
120 /** used when no other sighandling happens, so we don't die
121 * when multiple signals in quick succession are sent to us.
122 * @param sig: signal number.
123 * @return signal handler return type (void or int).
124 */
record_sigh(int sig)125 static RETSIGTYPE record_sigh(int sig)
126 {
127 #ifdef LIBEVENT_SIGNAL_PROBLEM
128 /* cannot log, verbose here because locks may be held */
129 /* quit on signal, no cleanup and statistics,
130 because installed libevent version is not threadsafe */
131 exit(0);
132 #endif
133 switch(sig)
134 {
135 case SIGTERM:
136 #ifdef SIGQUIT
137 case SIGQUIT:
138 #endif
139 #ifdef SIGBREAK
140 case SIGBREAK:
141 #endif
142 case SIGINT:
143 sig_record_quit++;
144 break;
145 #ifdef SIGHUP
146 case SIGHUP:
147 sig_record_reload++;
148 break;
149 #endif
150 #ifdef SIGPIPE
151 case SIGPIPE:
152 break;
153 #endif
154 default:
155 /* ignoring signal */
156 break;
157 }
158 }
159
160 /**
161 * Signal handling during the time when netevent is disabled.
162 * Stores signals to replay later.
163 */
164 static void
signal_handling_record(void)165 signal_handling_record(void)
166 {
167 if( signal(SIGTERM, record_sigh) == SIG_ERR ||
168 #ifdef SIGQUIT
169 signal(SIGQUIT, record_sigh) == SIG_ERR ||
170 #endif
171 #ifdef SIGBREAK
172 signal(SIGBREAK, record_sigh) == SIG_ERR ||
173 #endif
174 #ifdef SIGHUP
175 signal(SIGHUP, record_sigh) == SIG_ERR ||
176 #endif
177 #ifdef SIGPIPE
178 signal(SIGPIPE, SIG_IGN) == SIG_ERR ||
179 #endif
180 signal(SIGINT, record_sigh) == SIG_ERR
181 )
182 log_err("install sighandler: %s", strerror(errno));
183 }
184
185 /**
186 * Replay old signals.
187 * @param wrk: worker that handles signals.
188 */
189 static void
signal_handling_playback(struct worker * wrk)190 signal_handling_playback(struct worker* wrk)
191 {
192 #ifdef SIGHUP
193 if(sig_record_reload)
194 worker_sighandler(SIGHUP, wrk);
195 #endif
196 if(sig_record_quit)
197 worker_sighandler(SIGTERM, wrk);
198 sig_record_quit = 0;
199 sig_record_reload = 0;
200 }
201
202 struct daemon*
daemon_init(void)203 daemon_init(void)
204 {
205 struct daemon* daemon = (struct daemon*)calloc(1,
206 sizeof(struct daemon));
207 #ifdef USE_WINSOCK
208 int r;
209 WSADATA wsa_data;
210 #endif
211 if(!daemon)
212 return NULL;
213 #ifdef USE_WINSOCK
214 r = WSAStartup(MAKEWORD(2,2), &wsa_data);
215 if(r != 0) {
216 fatal_exit("could not init winsock. WSAStartup: %s",
217 wsa_strerror(r));
218 }
219 #endif /* USE_WINSOCK */
220 signal_handling_record();
221 #ifdef HAVE_SSL
222 # ifdef HAVE_ERR_LOAD_CRYPTO_STRINGS
223 ERR_load_crypto_strings();
224 # endif
225 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
226 ERR_load_SSL_strings();
227 #endif
228 # ifdef USE_GOST
229 (void)sldns_key_EVP_load_gost_id();
230 # endif
231 # if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO)
232 # ifndef S_SPLINT_S
233 OpenSSL_add_all_algorithms();
234 # endif
235 # else
236 OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
237 | OPENSSL_INIT_ADD_ALL_DIGESTS
238 | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
239 # endif
240 # if HAVE_DECL_SSL_COMP_GET_COMPRESSION_METHODS
241 /* grab the COMP method ptr because openssl leaks it */
242 comp_meth = (void*)SSL_COMP_get_compression_methods();
243 # endif
244 # if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
245 (void)SSL_library_init();
246 # else
247 (void)OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
248 # endif
249 # if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
250 if(!ub_openssl_lock_init())
251 fatal_exit("could not init openssl locks");
252 # endif
253 #elif defined(HAVE_NSS)
254 if(NSS_NoDB_Init(NULL) != SECSuccess)
255 fatal_exit("could not init NSS");
256 #endif /* HAVE_SSL or HAVE_NSS */
257 #ifdef HAVE_TZSET
258 /* init timezone info while we are not chrooted yet */
259 tzset();
260 #endif
261 daemon->need_to_exit = 0;
262 modstack_init(&daemon->mods);
263 if(!(daemon->env = (struct module_env*)calloc(1,
264 sizeof(*daemon->env)))) {
265 free(daemon);
266 return NULL;
267 }
268 daemon->env->modstack = &daemon->mods;
269 /* init edns_known_options */
270 if(!edns_known_options_init(daemon->env)) {
271 free(daemon->env);
272 free(daemon);
273 return NULL;
274 }
275 alloc_init(&daemon->superalloc, NULL, 0);
276 daemon->acl = acl_list_create();
277 if(!daemon->acl) {
278 edns_known_options_delete(daemon->env);
279 free(daemon->env);
280 free(daemon);
281 return NULL;
282 }
283 daemon->acl_interface = acl_list_create();
284 if(!daemon->acl_interface) {
285 acl_list_delete(daemon->acl);
286 edns_known_options_delete(daemon->env);
287 free(daemon->env);
288 free(daemon);
289 return NULL;
290 }
291 daemon->tcl = tcl_list_create();
292 if(!daemon->tcl) {
293 acl_list_delete(daemon->acl_interface);
294 acl_list_delete(daemon->acl);
295 edns_known_options_delete(daemon->env);
296 free(daemon->env);
297 free(daemon);
298 return NULL;
299 }
300 listen_setup_locks();
301 if(gettimeofday(&daemon->time_boot, NULL) < 0)
302 log_err("gettimeofday: %s", strerror(errno));
303 daemon->time_last_stat = daemon->time_boot;
304 if((daemon->env->auth_zones = auth_zones_create()) == 0) {
305 acl_list_delete(daemon->acl_interface);
306 acl_list_delete(daemon->acl);
307 tcl_list_delete(daemon->tcl);
308 edns_known_options_delete(daemon->env);
309 free(daemon->env);
310 free(daemon);
311 return NULL;
312 }
313 if(!(daemon->env->edns_strings = edns_strings_create())) {
314 auth_zones_delete(daemon->env->auth_zones);
315 acl_list_delete(daemon->acl_interface);
316 acl_list_delete(daemon->acl);
317 tcl_list_delete(daemon->tcl);
318 edns_known_options_delete(daemon->env);
319 free(daemon->env);
320 free(daemon);
321 return NULL;
322 }
323 return daemon;
324 }
325
setup_acl_for_ports(struct acl_list * list,struct listen_port * port_list)326 static int setup_acl_for_ports(struct acl_list* list,
327 struct listen_port* port_list)
328 {
329 struct acl_addr* acl_node;
330 for(; port_list; port_list=port_list->next) {
331 if(!port_list->socket) {
332 /* This is mainly for testbound where port_list is
333 * empty. */
334 continue;
335 }
336 if(!(acl_node = acl_interface_insert(list,
337 (struct sockaddr_storage*)port_list->socket->addr,
338 port_list->socket->addrlen,
339 acl_refuse))) {
340 return 0;
341 }
342 port_list->socket->acl = acl_node;
343 }
344 return 1;
345 }
346
347 int
daemon_open_shared_ports(struct daemon * daemon)348 daemon_open_shared_ports(struct daemon* daemon)
349 {
350 log_assert(daemon);
351 if(daemon->cfg->port != daemon->listening_port) {
352 char** resif = NULL;
353 int num_resif = 0;
354 size_t i;
355 struct listen_port* p0;
356 daemon->reuseport = 0;
357 /* free and close old ports */
358 if(daemon->ports != NULL) {
359 for(i=0; i<daemon->num_ports; i++)
360 listening_ports_free(daemon->ports[i]);
361 free(daemon->ports);
362 daemon->ports = NULL;
363 }
364 /* clean acl_interface */
365 acl_interface_init(daemon->acl_interface);
366 if(!resolve_interface_names(daemon->cfg->ifs,
367 daemon->cfg->num_ifs, NULL, &resif, &num_resif))
368 return 0;
369 /* see if we want to reuseport */
370 #ifdef SO_REUSEPORT
371 if(daemon->cfg->so_reuseport && daemon->cfg->num_threads > 0)
372 daemon->reuseport = 1;
373 #endif
374 /* try to use reuseport */
375 p0 = listening_ports_open(daemon->cfg, resif, num_resif,
376 &daemon->reuseport);
377 if(!p0) {
378 listening_ports_free(p0);
379 config_del_strarray(resif, num_resif);
380 return 0;
381 }
382 if(daemon->reuseport) {
383 /* reuseport was successful, allocate for it */
384 daemon->num_ports = (size_t)daemon->cfg->num_threads;
385 } else {
386 /* do the normal, singleportslist thing,
387 * reuseport not enabled or did not work */
388 daemon->num_ports = 1;
389 }
390 if(!(daemon->ports = (struct listen_port**)calloc(
391 daemon->num_ports, sizeof(*daemon->ports)))) {
392 listening_ports_free(p0);
393 config_del_strarray(resif, num_resif);
394 return 0;
395 }
396 daemon->ports[0] = p0;
397 if(!setup_acl_for_ports(daemon->acl_interface,
398 daemon->ports[0])) {
399 listening_ports_free(p0);
400 config_del_strarray(resif, num_resif);
401 return 0;
402 }
403 if(daemon->reuseport) {
404 /* continue to use reuseport */
405 for(i=1; i<daemon->num_ports; i++) {
406 if(!(daemon->ports[i]=
407 listening_ports_open(daemon->cfg,
408 resif, num_resif,
409 &daemon->reuseport))
410 || !daemon->reuseport ) {
411 for(i=0; i<daemon->num_ports; i++)
412 listening_ports_free(daemon->ports[i]);
413 free(daemon->ports);
414 daemon->ports = NULL;
415 config_del_strarray(resif, num_resif);
416 return 0;
417 }
418 if(!setup_acl_for_ports(daemon->acl_interface,
419 daemon->ports[i])) {
420 for(i=0; i<daemon->num_ports; i++)
421 listening_ports_free(daemon->ports[i]);
422 free(daemon->ports);
423 daemon->ports = NULL;
424 config_del_strarray(resif, num_resif);
425 return 0;
426 }
427 }
428 }
429 config_del_strarray(resif, num_resif);
430 daemon->listening_port = daemon->cfg->port;
431 }
432 if(!daemon->cfg->remote_control_enable && daemon->rc_port) {
433 listening_ports_free(daemon->rc_ports);
434 daemon->rc_ports = NULL;
435 daemon->rc_port = 0;
436 }
437 if(daemon->cfg->remote_control_enable &&
438 daemon->cfg->control_port != daemon->rc_port) {
439 listening_ports_free(daemon->rc_ports);
440 if(!(daemon->rc_ports=daemon_remote_open_ports(daemon->cfg)))
441 return 0;
442 daemon->rc_port = daemon->cfg->control_port;
443 }
444 return 1;
445 }
446
447 int
daemon_privileged(struct daemon * daemon)448 daemon_privileged(struct daemon* daemon)
449 {
450 daemon->env->cfg = daemon->cfg;
451 daemon->env->alloc = &daemon->superalloc;
452 daemon->env->worker = NULL;
453 if(!modstack_call_startup(&daemon->mods, daemon->cfg->module_conf,
454 daemon->env)) {
455 fatal_exit("failed to startup modules");
456 }
457 return 1;
458 }
459
460 /**
461 * Setup modules. setup module stack.
462 * @param daemon: the daemon
463 */
daemon_setup_modules(struct daemon * daemon)464 static void daemon_setup_modules(struct daemon* daemon)
465 {
466 daemon->env->cfg = daemon->cfg;
467 daemon->env->alloc = &daemon->superalloc;
468 daemon->env->worker = NULL;
469 if(daemon->mods_inited) {
470 modstack_call_deinit(&daemon->mods, daemon->env);
471 }
472 daemon->env->need_to_validate = 0; /* set by module init below */
473 if(!modstack_call_init(&daemon->mods, daemon->cfg->module_conf,
474 daemon->env)) {
475 fatal_exit("failed to init modules");
476 }
477 daemon->mods_inited = 1;
478 log_edns_known_options(VERB_ALGO, daemon->env);
479 }
480
481 /**
482 * Obtain allowed port numbers, concatenate the list, and shuffle them
483 * (ready to be handed out to threads).
484 * @param daemon: the daemon. Uses rand and cfg.
485 * @param shufport: the portlist output.
486 * @return number of ports available.
487 */
daemon_get_shufport(struct daemon * daemon,int * shufport)488 static int daemon_get_shufport(struct daemon* daemon, int* shufport)
489 {
490 int i, n, k, temp;
491 int avail = 0;
492 for(i=0; i<65536; i++) {
493 if(daemon->cfg->outgoing_avail_ports[i]) {
494 shufport[avail++] = daemon->cfg->
495 outgoing_avail_ports[i];
496 }
497 }
498 if(avail == 0)
499 fatal_exit("no ports are permitted for UDP, add "
500 "with outgoing-port-permit");
501 /* Knuth shuffle */
502 n = avail;
503 while(--n > 0) {
504 k = ub_random_max(daemon->rand, n+1); /* 0<= k<= n */
505 temp = shufport[k];
506 shufport[k] = shufport[n];
507 shufport[n] = temp;
508 }
509 return avail;
510 }
511
512 /**
513 * Clear and delete per-worker alloc caches, and free memory maintained in
514 * superalloc.
515 * The rrset and message caches must be empty at the time of call.
516 * @param daemon: the daemon that maintains the alloc caches to be cleared.
517 */
518 static void
daemon_clear_allocs(struct daemon * daemon)519 daemon_clear_allocs(struct daemon* daemon)
520 {
521 int i;
522
523 /* daemon->num may be different during reloads (after configuration
524 * read). Use old_num which has the correct value used to setup the
525 * worker_allocs */
526 for(i=0; i<daemon->old_num; i++) {
527 alloc_clear(daemon->worker_allocs[i]);
528 free(daemon->worker_allocs[i]);
529 }
530 free(daemon->worker_allocs);
531 daemon->worker_allocs = NULL;
532
533 alloc_clear_special(&daemon->superalloc);
534 }
535
536 /**
537 * Allocate empty worker structures. With backptr and thread-number,
538 * from 0..numthread initialised. Used as user arguments to new threads.
539 * Creates the daemon random generator if it does not exist yet.
540 * The random generator stays existing between reloads with a unique state.
541 * @param daemon: the daemon with (new) config settings.
542 */
543 static void
daemon_create_workers(struct daemon * daemon)544 daemon_create_workers(struct daemon* daemon)
545 {
546 int i, numport;
547 int* shufport;
548 log_assert(daemon && daemon->cfg);
549 if(!daemon->rand) {
550 daemon->rand = ub_initstate(NULL);
551 if(!daemon->rand)
552 fatal_exit("could not init random generator");
553 hash_set_raninit((uint32_t)ub_random(daemon->rand));
554 }
555 shufport = (int*)calloc(65536, sizeof(int));
556 if(!shufport)
557 fatal_exit("out of memory during daemon init");
558 numport = daemon_get_shufport(daemon, shufport);
559 verbose(VERB_ALGO, "total of %d outgoing ports available", numport);
560
561 #ifdef HAVE_NGTCP2
562 daemon->doq_table = doq_table_create(daemon->cfg, daemon->rand);
563 if(!daemon->doq_table)
564 fatal_exit("could not create doq_table: out of memory");
565 #endif
566
567 daemon->num = (daemon->cfg->num_threads?daemon->cfg->num_threads:1);
568 if(daemon->reuseport && (int)daemon->num < (int)daemon->num_ports) {
569 log_warn("cannot reduce num-threads to %d because so-reuseport "
570 "so continuing with %d threads.", (int)daemon->num,
571 (int)daemon->num_ports);
572 daemon->num = (int)daemon->num_ports;
573 }
574 daemon->workers = (struct worker**)calloc((size_t)daemon->num,
575 sizeof(struct worker*));
576 if(!daemon->workers)
577 fatal_exit("out of memory during daemon init");
578 if(daemon->cfg->dnstap) {
579 #ifdef USE_DNSTAP
580 daemon->dtenv = dt_create(daemon->cfg);
581 if (!daemon->dtenv)
582 fatal_exit("dt_create failed");
583 #else
584 fatal_exit("dnstap enabled in config but not built with dnstap support");
585 #endif
586 }
587 for(i=0; i<daemon->num; i++) {
588 if(!(daemon->workers[i] = worker_create(daemon, i,
589 shufport+numport*i/daemon->num,
590 numport*(i+1)/daemon->num - numport*i/daemon->num)))
591 /* the above is not ports/numthr, due to rounding */
592 fatal_exit("could not create worker");
593 }
594 /* create per-worker alloc caches if not reusing existing ones. */
595 if(!daemon->worker_allocs) {
596 daemon->worker_allocs = (struct alloc_cache**)calloc(
597 (size_t)daemon->num, sizeof(struct alloc_cache*));
598 if(!daemon->worker_allocs)
599 fatal_exit("could not allocate worker allocs");
600 for(i=0; i<daemon->num; i++) {
601 struct alloc_cache* alloc = calloc(1,
602 sizeof(struct alloc_cache));
603 if (!alloc)
604 fatal_exit("could not allocate worker alloc");
605 alloc_init(alloc, &daemon->superalloc, i);
606 daemon->worker_allocs[i] = alloc;
607 }
608 }
609 free(shufport);
610 }
611
612 #ifdef THREADS_DISABLED
613 /**
614 * Close all pipes except for the numbered thread.
615 * @param daemon: daemon to close pipes in.
616 * @param thr: thread number 0..num-1 of thread to skip.
617 */
close_other_pipes(struct daemon * daemon,int thr)618 static void close_other_pipes(struct daemon* daemon, int thr)
619 {
620 int i;
621 for(i=0; i<daemon->num; i++)
622 if(i!=thr) {
623 if(i==0) {
624 /* only close read part, need to write stats */
625 tube_close_read(daemon->workers[i]->cmd);
626 } else {
627 /* complete close channel to others */
628 tube_delete(daemon->workers[i]->cmd);
629 daemon->workers[i]->cmd = NULL;
630 }
631 }
632 }
633 #endif /* THREADS_DISABLED */
634
635 /**
636 * Function to start one thread.
637 * @param arg: user argument.
638 * @return: void* user return value could be used for thread_join results.
639 */
640 static void*
thread_start(void * arg)641 thread_start(void* arg)
642 {
643 struct worker* worker = (struct worker*)arg;
644 int port_num = 0;
645 log_thread_set(&worker->thread_num);
646 ub_thread_blocksigs();
647 #ifdef THREADS_DISABLED
648 /* close pipe ends used by main */
649 tube_close_write(worker->cmd);
650 close_other_pipes(worker->daemon, worker->thread_num);
651 #endif
652 #ifdef SO_REUSEPORT
653 if(worker->daemon->cfg->so_reuseport)
654 port_num = worker->thread_num % worker->daemon->num_ports;
655 else
656 port_num = 0;
657 #endif
658 if(!worker_init(worker, worker->daemon->cfg,
659 worker->daemon->ports[port_num], 0))
660 fatal_exit("Could not initialize thread");
661
662 worker_work(worker);
663 return NULL;
664 }
665
666 /**
667 * Fork and init the other threads. Main thread returns for special handling.
668 * @param daemon: the daemon with other threads to fork.
669 */
670 static void
daemon_start_others(struct daemon * daemon)671 daemon_start_others(struct daemon* daemon)
672 {
673 int i;
674 log_assert(daemon);
675 verbose(VERB_ALGO, "start threads");
676 /* skip i=0, is this thread */
677 for(i=1; i<daemon->num; i++) {
678 ub_thread_create(&daemon->workers[i]->thr_id,
679 thread_start, daemon->workers[i]);
680 #ifdef THREADS_DISABLED
681 /* close pipe end of child */
682 tube_close_read(daemon->workers[i]->cmd);
683 #endif /* no threads */
684 }
685 }
686
687 /**
688 * Stop the other threads.
689 * @param daemon: the daemon with other threads.
690 */
691 static void
daemon_stop_others(struct daemon * daemon)692 daemon_stop_others(struct daemon* daemon)
693 {
694 int i;
695 log_assert(daemon);
696 verbose(VERB_ALGO, "stop threads");
697 /* skip i=0, is this thread */
698 /* use i=0 buffer for sending cmds; because we are #0 */
699 for(i=1; i<daemon->num; i++) {
700 worker_send_cmd(daemon->workers[i], worker_cmd_quit);
701 }
702 /* wait for them to quit */
703 for(i=1; i<daemon->num; i++) {
704 /* join it to make sure its dead */
705 verbose(VERB_ALGO, "join %d", i);
706 ub_thread_join(daemon->workers[i]->thr_id);
707 verbose(VERB_ALGO, "join success %d", i);
708 }
709 }
710
711 void
daemon_fork(struct daemon * daemon)712 daemon_fork(struct daemon* daemon)
713 {
714 int have_view_respip_cfg = 0;
715 #ifdef HAVE_SYSTEMD
716 int ret;
717 #endif
718
719 log_assert(daemon);
720 if(!(daemon->views = views_create()))
721 fatal_exit("Could not create views: out of memory");
722 /* create individual views and their localzone/data trees */
723 if(!views_apply_cfg(daemon->views, daemon->cfg))
724 fatal_exit("Could not set up views");
725
726 if(!acl_list_apply_cfg(daemon->acl, daemon->cfg, daemon->views))
727 fatal_exit("Could not setup access control list");
728 if(!acl_interface_apply_cfg(daemon->acl_interface, daemon->cfg,
729 daemon->views))
730 fatal_exit("Could not setup interface control list");
731 if(!tcl_list_apply_cfg(daemon->tcl, daemon->cfg))
732 fatal_exit("Could not setup TCP connection limits");
733 if(daemon->cfg->dnscrypt) {
734 #ifdef USE_DNSCRYPT
735 daemon->dnscenv = dnsc_create();
736 if (!daemon->dnscenv)
737 fatal_exit("dnsc_create failed");
738 dnsc_apply_cfg(daemon->dnscenv, daemon->cfg);
739 #else
740 fatal_exit("dnscrypt enabled in config but unbound was not built with "
741 "dnscrypt support");
742 #endif
743 }
744 if(daemon->cfg->cookie_secret_file &&
745 daemon->cfg->cookie_secret_file[0]) {
746 if(!(daemon->cookie_secrets = cookie_secrets_create()))
747 fatal_exit("Could not create cookie_secrets: out of memory");
748 if(!cookie_secrets_apply_cfg(daemon->cookie_secrets,
749 daemon->cfg->cookie_secret_file))
750 fatal_exit("Could not setup cookie_secrets");
751 }
752 /* create global local_zones */
753 if(!(daemon->local_zones = local_zones_create()))
754 fatal_exit("Could not create local zones: out of memory");
755 if(!local_zones_apply_cfg(daemon->local_zones, daemon->cfg))
756 fatal_exit("Could not set up local zones");
757 if(!(daemon->env->fwds = forwards_create()) ||
758 !forwards_apply_cfg(daemon->env->fwds, daemon->cfg))
759 fatal_exit("Could not set forward zones");
760 if(!(daemon->env->hints = hints_create()) ||
761 !hints_apply_cfg(daemon->env->hints, daemon->cfg))
762 fatal_exit("Could not set root or stub hints");
763
764 /* process raw response-ip configuration data */
765 if(!(daemon->respip_set = respip_set_create()))
766 fatal_exit("Could not create response IP set");
767 if(!respip_global_apply_cfg(daemon->respip_set, daemon->cfg))
768 fatal_exit("Could not set up response IP set");
769 if(!respip_views_apply_cfg(daemon->views, daemon->cfg,
770 &have_view_respip_cfg))
771 fatal_exit("Could not set up per-view response IP sets");
772 daemon->use_response_ip = !respip_set_is_empty(daemon->respip_set) ||
773 have_view_respip_cfg;
774
775 /* setup modules */
776 daemon_setup_modules(daemon);
777
778 /* read auth zonefiles */
779 if(!auth_zones_apply_cfg(daemon->env->auth_zones, daemon->cfg, 1,
780 &daemon->use_rpz, daemon->env, &daemon->mods))
781 fatal_exit("auth_zones could not be setup");
782
783 /* Set-up EDNS strings */
784 if(!edns_strings_apply_cfg(daemon->env->edns_strings, daemon->cfg))
785 fatal_exit("Could not set up EDNS strings");
786
787 #ifdef USE_CACHEDB
788 daemon->env->cachedb_enabled = cachedb_is_enabled(&daemon->mods,
789 daemon->env);
790 #endif
791 /* response-ip-xxx options don't work as expected without the respip
792 * module. To avoid run-time operational surprise we reject such
793 * configuration. */
794 if(daemon->use_response_ip &&
795 modstack_find(&daemon->mods, "respip") < 0)
796 fatal_exit("response-ip options require respip module");
797 /* RPZ response ip triggers don't work as expected without the respip
798 * module. To avoid run-time operational surprise we reject such
799 * configuration. */
800 if(daemon->use_rpz &&
801 modstack_find(&daemon->mods, "respip") < 0)
802 fatal_exit("RPZ requires the respip module");
803
804 /* first create all the worker structures, so we can pass
805 * them to the newly created threads.
806 */
807 daemon_create_workers(daemon);
808
809 #if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
810 /* in libev the first inited base gets signals */
811 if(!worker_init(daemon->workers[0], daemon->cfg, daemon->ports[0], 1))
812 fatal_exit("Could not initialize main thread");
813 #endif
814
815 /* Now create the threads and init the workers.
816 * By the way, this is thread #0 (the main thread).
817 */
818 daemon_start_others(daemon);
819
820 /* Special handling for the main thread. This is the thread
821 * that handles signals and remote control.
822 */
823 #if !(defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP))
824 /* libevent has the last inited base get signals (or any base) */
825 if(!worker_init(daemon->workers[0], daemon->cfg, daemon->ports[0], 1))
826 fatal_exit("Could not initialize main thread");
827 #endif
828 signal_handling_playback(daemon->workers[0]);
829
830 if (!shm_main_init(daemon))
831 log_warn("SHM has failed");
832
833 /* Start resolver service on main thread. */
834 #ifdef HAVE_SYSTEMD
835 ret = sd_notify(0, "READY=1");
836 if(ret <= 0 && getenv("NOTIFY_SOCKET"))
837 fatal_exit("sd_notify failed %s: %s. Make sure that unbound has "
838 "access/permission to use the socket presented by systemd.",
839 getenv("NOTIFY_SOCKET"),
840 (ret==0?"no $NOTIFY_SOCKET": strerror(-ret)));
841 #endif
842 log_info("start of service (%s).", PACKAGE_STRING);
843 worker_work(daemon->workers[0]);
844 #ifdef HAVE_SYSTEMD
845 if (daemon->workers[0]->need_to_exit)
846 sd_notify(0, "STOPPING=1");
847 else
848 sd_notify(0, "RELOADING=1");
849 #endif
850 log_info("service stopped (%s).", PACKAGE_STRING);
851
852 /* we exited! a signal happened! Stop other threads */
853 daemon_stop_others(daemon);
854
855 /* Shutdown SHM */
856 shm_main_shutdown(daemon);
857
858 daemon->reuse_cache = daemon->workers[0]->reuse_cache;
859 daemon->need_to_exit = daemon->workers[0]->need_to_exit;
860 }
861
862 void
daemon_cleanup(struct daemon * daemon)863 daemon_cleanup(struct daemon* daemon)
864 {
865 int i;
866 log_assert(daemon);
867 /* before stopping main worker, handle signals ourselves, so we
868 don't die on multiple reload signals for example. */
869 signal_handling_record();
870 log_thread_set(NULL);
871 /* clean up caches because
872 * a) RRset IDs will be recycled after a reload, causing collisions
873 * b) validation config can change, thus rrset, msg, keycache clear
874 *
875 * If we are trying to keep the cache as long as possible, we should
876 * defer the cleanup until we know whether the new configuration allows
877 * the reuse. (If we're exiting, cleanup should be done here). */
878 if(!daemon->reuse_cache || daemon->need_to_exit) {
879 slabhash_clear(&daemon->env->rrset_cache->table);
880 slabhash_clear(daemon->env->msg_cache);
881 }
882 daemon->old_num = daemon->num; /* save the current num */
883 forwards_delete(daemon->env->fwds);
884 daemon->env->fwds = NULL;
885 hints_delete(daemon->env->hints);
886 daemon->env->hints = NULL;
887 local_zones_delete(daemon->local_zones);
888 daemon->local_zones = NULL;
889 respip_set_delete(daemon->respip_set);
890 daemon->respip_set = NULL;
891 views_delete(daemon->views);
892 daemon->views = NULL;
893 if(daemon->env->auth_zones)
894 auth_zones_cleanup(daemon->env->auth_zones);
895 /* key cache is cleared by module deinit during next daemon_fork() */
896 daemon_remote_clear(daemon->rc);
897 for(i=0; i<daemon->num; i++)
898 worker_delete(daemon->workers[i]);
899 free(daemon->workers);
900 daemon->workers = NULL;
901 /* Unless we're trying to keep the cache, worker alloc_caches should be
902 * cleared and freed here. We do this after deleting workers to
903 * guarantee that the alloc caches are valid throughout the lifetime
904 * of workers. */
905 if(!daemon->reuse_cache || daemon->need_to_exit)
906 daemon_clear_allocs(daemon);
907 daemon->num = 0;
908 #ifdef USE_DNSTAP
909 dt_delete(daemon->dtenv);
910 daemon->dtenv = NULL;
911 #endif
912 #ifdef USE_DNSCRYPT
913 dnsc_delete(daemon->dnscenv);
914 daemon->dnscenv = NULL;
915 #endif
916 #ifdef HAVE_NGTCP2
917 doq_table_delete(daemon->doq_table);
918 daemon->doq_table = NULL;
919 #endif
920 daemon->cfg = NULL;
921 }
922
923 void
daemon_delete(struct daemon * daemon)924 daemon_delete(struct daemon* daemon)
925 {
926 size_t i;
927 if(!daemon)
928 return;
929 modstack_call_deinit(&daemon->mods, daemon->env);
930 modstack_call_destartup(&daemon->mods, daemon->env);
931 modstack_free(&daemon->mods);
932 daemon_remote_delete(daemon->rc);
933 for(i = 0; i < daemon->num_ports; i++)
934 listening_ports_free(daemon->ports[i]);
935 free(daemon->ports);
936 listening_ports_free(daemon->rc_ports);
937 if(daemon->env) {
938 slabhash_delete(daemon->env->msg_cache);
939 rrset_cache_delete(daemon->env->rrset_cache);
940 infra_delete(daemon->env->infra_cache);
941 edns_known_options_delete(daemon->env);
942 edns_strings_delete(daemon->env->edns_strings);
943 auth_zones_delete(daemon->env->auth_zones);
944 }
945 ub_randfree(daemon->rand);
946 alloc_clear(&daemon->superalloc);
947 acl_list_delete(daemon->acl);
948 acl_list_delete(daemon->acl_interface);
949 tcl_list_delete(daemon->tcl);
950 cookie_secrets_delete(daemon->cookie_secrets);
951 listen_desetup_locks();
952 free(daemon->chroot);
953 free(daemon->pidfile);
954 free(daemon->env);
955 #ifdef HAVE_SSL
956 listen_sslctx_delete_ticket_keys();
957 SSL_CTX_free((SSL_CTX*)daemon->listen_sslctx);
958 SSL_CTX_free((SSL_CTX*)daemon->connect_sslctx);
959 #endif
960 free(daemon);
961 /* lex cleanup */
962 ub_c_lex_destroy();
963 /* libcrypto cleanup */
964 #ifdef HAVE_SSL
965 # if defined(USE_GOST)
966 sldns_key_EVP_unload_gost();
967 # endif
968 # if HAVE_DECL_SSL_COMP_GET_COMPRESSION_METHODS && HAVE_DECL_SK_SSL_COMP_POP_FREE
969 # ifndef S_SPLINT_S
970 # if OPENSSL_VERSION_NUMBER < 0x10100000
971 sk_SSL_COMP_pop_free(comp_meth, (void(*)())CRYPTO_free);
972 # endif
973 # endif
974 # endif
975 # ifdef HAVE_OPENSSL_CONFIG
976 EVP_cleanup();
977 # if (OPENSSL_VERSION_NUMBER < 0x10100000) && !defined(OPENSSL_NO_ENGINE) && defined(HAVE_ENGINE_CLEANUP)
978 ENGINE_cleanup();
979 # endif
980 CONF_modules_free();
981 # endif
982 # ifdef HAVE_CRYPTO_CLEANUP_ALL_EX_DATA
983 CRYPTO_cleanup_all_ex_data(); /* safe, no more threads right now */
984 # endif
985 # ifdef HAVE_ERR_FREE_STRINGS
986 ERR_free_strings();
987 # endif
988 # if OPENSSL_VERSION_NUMBER < 0x10100000
989 RAND_cleanup();
990 # endif
991 # if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
992 ub_openssl_lock_delete();
993 # endif
994 #ifndef HAVE_ARC4RANDOM
995 _ARC4_LOCK_DESTROY();
996 #endif
997 #elif defined(HAVE_NSS)
998 NSS_Shutdown();
999 #endif /* HAVE_SSL or HAVE_NSS */
1000 checklock_stop();
1001 #ifdef USE_WINSOCK
1002 if(WSACleanup() != 0) {
1003 log_err("Could not WSACleanup: %s",
1004 wsa_strerror(WSAGetLastError()));
1005 }
1006 #endif
1007 }
1008
daemon_apply_cfg(struct daemon * daemon,struct config_file * cfg)1009 void daemon_apply_cfg(struct daemon* daemon, struct config_file* cfg)
1010 {
1011 int new_num = cfg->num_threads?cfg->num_threads:1;
1012
1013 daemon->cfg = cfg;
1014 config_apply(cfg);
1015
1016 /* If this is a reload and we deferred the decision on whether to
1017 * reuse the alloc, RRset, and message caches, then check to see if
1018 * it's safe to keep the caches:
1019 * - changing the number of threads is obviously incompatible with
1020 * keeping the per-thread alloc caches. It also means we have to
1021 * clear RRset and message caches. (note that 'new_num' may be
1022 * adjusted in daemon_create_workers, but for our purpose we can
1023 * simply compare it with 'old_num'; if they are equal here,
1024 * 'new_num' won't be adjusted to a different value than 'old_num').
1025 * - changing RRset cache size effectively clears any remaining cache
1026 * entries. We could keep their keys in alloc caches, but it would
1027 * be more consistent with the sense of the change to clear allocs
1028 * and free memory. To do so we also have to clear message cache.
1029 * - only changing message cache size does not necessarily affect
1030 * RRset or alloc cache. But almost all new subsequent queries will
1031 * require recursive resolution anyway, so it doesn't help much to
1032 * just keep RRset and alloc caches. For simplicity we clear/free
1033 * the other two, too. */
1034 if(daemon->worker_allocs &&
1035 (new_num != daemon->old_num ||
1036 !slabhash_is_size(daemon->env->msg_cache, cfg->msg_cache_size,
1037 cfg->msg_cache_slabs) ||
1038 !slabhash_is_size(&daemon->env->rrset_cache->table,
1039 cfg->rrset_cache_size, cfg->rrset_cache_slabs)))
1040 {
1041 log_warn("cannot reuse caches due to critical config change");
1042 slabhash_clear(&daemon->env->rrset_cache->table);
1043 slabhash_clear(daemon->env->msg_cache);
1044 daemon_clear_allocs(daemon);
1045 }
1046
1047 if(!slabhash_is_size(daemon->env->msg_cache, cfg->msg_cache_size,
1048 cfg->msg_cache_slabs)) {
1049 slabhash_delete(daemon->env->msg_cache);
1050 daemon->env->msg_cache = slabhash_create(cfg->msg_cache_slabs,
1051 HASH_DEFAULT_STARTARRAY, cfg->msg_cache_size,
1052 msgreply_sizefunc, query_info_compare,
1053 query_entry_delete, reply_info_delete, NULL);
1054 if(!daemon->env->msg_cache) {
1055 fatal_exit("malloc failure updating config settings");
1056 }
1057 }
1058 if((daemon->env->rrset_cache = rrset_cache_adjust(
1059 daemon->env->rrset_cache, cfg, &daemon->superalloc)) == 0)
1060 fatal_exit("malloc failure updating config settings");
1061 if((daemon->env->infra_cache = infra_adjust(daemon->env->infra_cache,
1062 cfg))==0)
1063 fatal_exit("malloc failure updating config settings");
1064 }
1065