1 /*
2 * daemon/unbound.c - main program for unbound DNS resolver daemon.
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 /**
38 * \file
39 *
40 * Main program to start the DNS resolver daemon.
41 */
42
43 #include "config.h"
44 #ifdef HAVE_GETOPT_H
45 #include <getopt.h>
46 #endif
47 #include <sys/time.h>
48 #include "util/log.h"
49 #include "daemon/daemon.h"
50 #include "daemon/remote.h"
51 #include "util/config_file.h"
52 #include "util/storage/slabhash.h"
53 #include "services/listen_dnsport.h"
54 #include "services/cache/rrset.h"
55 #include "services/cache/infra.h"
56 #include "util/fptr_wlist.h"
57 #include "util/data/msgreply.h"
58 #include "util/module.h"
59 #include "util/net_help.h"
60 #include "util/ub_event.h"
61 #include <signal.h>
62 #include <fcntl.h>
63 #include <openssl/crypto.h>
64 #ifdef HAVE_PWD_H
65 #include <pwd.h>
66 #endif
67 #ifdef HAVE_GRP_H
68 #include <grp.h>
69 #endif
70 #include <openssl/ssl.h>
71
72 #ifndef S_SPLINT_S
73 /* splint chokes on this system header file */
74 #ifdef HAVE_SYS_RESOURCE_H
75 #include <sys/resource.h>
76 #endif
77 #endif /* S_SPLINT_S */
78 #ifdef HAVE_LOGIN_CAP_H
79 #include <login_cap.h>
80 #endif
81
82 #ifdef UB_ON_WINDOWS
83 # include "winrc/win_svc.h"
84 #endif
85
86 #ifdef HAVE_NSS
87 /* nss3 */
88 # include "nss.h"
89 #endif
90
91 #ifdef HAVE_TARGETCONDITIONALS_H
92 #include <TargetConditionals.h>
93 #endif
94
95 #if (defined(TARGET_OS_TV) && TARGET_OS_TV) || (defined(TARGET_OS_WATCH) && TARGET_OS_WATCH)
96 #undef HAVE_FORK
97 #endif
98
99 /** print build options. */
100 static void
print_build_options(void)101 print_build_options(void)
102 {
103 const char** m;
104 const char *evnm="event", *evsys="", *evmethod="";
105 time_t t;
106 struct timeval now;
107 struct ub_event_base* base;
108 printf("Version %s\n\n", PACKAGE_VERSION);
109 printf("Configure line: %s\n", CONFCMDLINE);
110 base = ub_default_event_base(0,&t,&now);
111 ub_get_event_sys(base, &evnm, &evsys, &evmethod);
112 printf("Linked libs: %s %s (it uses %s), %s\n",
113 evnm, evsys, evmethod,
114 #ifdef HAVE_SSL
115 # ifdef SSLEAY_VERSION
116 SSLeay_version(SSLEAY_VERSION)
117 # else
118 OpenSSL_version(OPENSSL_VERSION)
119 # endif
120 #elif defined(HAVE_NSS)
121 NSS_GetVersion()
122 #elif defined(HAVE_NETTLE)
123 "nettle"
124 #endif
125 );
126 printf("Linked modules:");
127 for(m = module_list_avail(); *m; m++)
128 printf(" %s", *m);
129 printf("\n");
130 #ifdef USE_DNSCRYPT
131 printf("DNSCrypt feature available\n");
132 #endif
133 #ifdef USE_TCP_FASTOPEN
134 printf("TCP Fastopen feature available\n");
135 #endif
136 ub_event_base_free(base);
137 printf("\nBSD licensed, see LICENSE in source package for details.\n");
138 printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
139 }
140
141 /** print usage. */
142 static void
usage(void)143 usage(void)
144 {
145 printf("usage: unbound [options]\n");
146 printf(" start unbound daemon DNS resolver.\n");
147 printf("-h this help.\n");
148 printf("-c file config file to read instead of %s\n", CONFIGFILE);
149 printf(" file format is described in unbound.conf(5).\n");
150 printf("-d do not fork into the background.\n");
151 printf("-p do not create a pidfile.\n");
152 printf("-v verbose (more times to increase verbosity).\n");
153 printf("-V show version number and build options.\n");
154 #ifdef UB_ON_WINDOWS
155 printf("-w opt windows option: \n");
156 printf(" install, remove - manage the services entry\n");
157 printf(" service - used to start from services control panel\n");
158 #endif
159 printf("\nVersion %s\n", PACKAGE_VERSION);
160 printf("BSD licensed, see LICENSE in source package for details.\n");
161 printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
162 }
163
164 #ifndef unbound_testbound
replay_var_compare(const void * ATTR_UNUSED (a),const void * ATTR_UNUSED (b))165 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
166 {
167 log_assert(0);
168 return 0;
169 }
170 #endif
171
172 /** check file descriptor count */
173 static void
checkrlimits(struct config_file * cfg)174 checkrlimits(struct config_file* cfg)
175 {
176 #ifndef S_SPLINT_S
177 #ifdef HAVE_GETRLIMIT
178 /* list has number of ports to listen to, ifs number addresses */
179 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 +
180 (int)cfg->incoming_num_tcp:0));
181 size_t listen_ifs = (size_t)(cfg->num_ifs==0?
182 ((cfg->do_ip4 && !cfg->if_automatic?1:0) +
183 (cfg->do_ip6?1:0)):cfg->num_ifs);
184 size_t listen_num = list*listen_ifs;
185 size_t outudpnum = (size_t)cfg->outgoing_num_ports;
186 size_t outtcpnum = cfg->outgoing_num_tcp;
187 size_t misc = 4; /* logfile, pidfile, stdout... */
188 size_t perthread_noudp = listen_num + outtcpnum +
189 2/*cmdpipe*/ + 2/*libevent*/ + misc;
190 size_t perthread = perthread_noudp + outudpnum;
191
192 #if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS)
193 int numthread = 1; /* it forks */
194 #else
195 int numthread = (cfg->num_threads?cfg->num_threads:1);
196 #endif
197 size_t total = numthread * perthread + misc;
198 size_t avail;
199 struct rlimit rlim;
200 size_t memsize_expect = cfg->msg_cache_size + cfg->rrset_cache_size
201 + (cfg->do_tcp?cfg->stream_wait_size:0)
202 + (cfg->ip_ratelimit?cfg->ip_ratelimit_size:0)
203 + (cfg->ratelimit?cfg->ratelimit_size:0)
204 + (cfg->dnscrypt?cfg->dnscrypt_shared_secret_cache_size + cfg->dnscrypt_nonce_cache_size:0)
205 + cfg->infra_cache_numhosts * (sizeof(struct infra_key)+sizeof(struct infra_data));
206 if(strstr(cfg->module_conf, "validator") && (cfg->trust_anchor_file_list || cfg->trust_anchor_list || cfg->auto_trust_anchor_file_list || cfg->trusted_keys_file_list)) {
207 memsize_expect += cfg->key_cache_size + cfg->neg_cache_size;
208 }
209 #ifdef HAVE_NGHTTP2_NGHTTP2_H
210 if(cfg_has_https(cfg)) {
211 memsize_expect += cfg->http_query_buffer_size + cfg->http_response_buffer_size;
212 }
213 #endif
214
215 #ifdef RLIMIT_AS
216 if(getrlimit(RLIMIT_AS, &rlim) == 0) {
217 if(rlim.rlim_cur != (rlim_t)RLIM_INFINITY &&
218 rlim.rlim_cur < (rlim_t)memsize_expect) {
219 log_warn("the ulimit(max memory size) is smaller than the expected memory usage (added size of caches). %u < %u bytes", (unsigned)rlim.rlim_cur, (unsigned)memsize_expect);
220 }
221 }
222 #endif
223 if(getrlimit(RLIMIT_DATA, &rlim) == 0) {
224 if(rlim.rlim_cur != (rlim_t)RLIM_INFINITY &&
225 rlim.rlim_cur < (rlim_t)memsize_expect) {
226 log_warn("the ulimit(data seg size) is smaller than the expected memory usage (added size of caches). %u < %u bytes", (unsigned)rlim.rlim_cur, (unsigned)memsize_expect);
227 }
228 }
229
230 if(total > 1024 &&
231 strncmp(ub_event_get_version(), "mini-event", 10) == 0) {
232 log_warn("too many file descriptors requested. The builtin"
233 "mini-event cannot handle more than 1024. Config "
234 "for less fds or compile with libevent");
235 if(numthread*perthread_noudp+15 > 1024)
236 fatal_exit("too much tcp. not enough fds.");
237 cfg->outgoing_num_ports = (int)((1024
238 - numthread*perthread_noudp
239 - 10 /* safety margin */) /numthread);
240 log_warn("continuing with less udp ports: %u",
241 cfg->outgoing_num_ports);
242 total = 1024;
243 }
244 if(perthread > 64 &&
245 strncmp(ub_event_get_version(), "winsock-event", 13) == 0) {
246 log_err("too many file descriptors requested. The winsock"
247 " event handler cannot handle more than 64 per "
248 " thread. Config for less fds");
249 if(perthread_noudp+2 > 64)
250 fatal_exit("too much tcp. not enough fds.");
251 cfg->outgoing_num_ports = (int)((64
252 - perthread_noudp
253 - 2/* safety margin */));
254 log_warn("continuing with less udp ports: %u",
255 cfg->outgoing_num_ports);
256 total = numthread*(perthread_noudp+
257 (size_t)cfg->outgoing_num_ports)+misc;
258 }
259 if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
260 log_warn("getrlimit: %s", strerror(errno));
261 return;
262 }
263 if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY)
264 return;
265 if((size_t)rlim.rlim_cur < total) {
266 avail = (size_t)rlim.rlim_cur;
267 rlim.rlim_cur = (rlim_t)(total + 10);
268 rlim.rlim_max = (rlim_t)(total + 10);
269 #ifdef HAVE_SETRLIMIT
270 if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
271 log_warn("setrlimit: %s", strerror(errno));
272 #endif
273 log_warn("cannot increase max open fds from %u to %u",
274 (unsigned)avail, (unsigned)total+10);
275 /* check that calculation below does not underflow,
276 * with 15 as margin */
277 if(numthread*perthread_noudp+15 > avail)
278 fatal_exit("too much tcp. not enough fds.");
279 cfg->outgoing_num_ports = (int)((avail
280 - numthread*perthread_noudp
281 - 10 /* safety margin */) /numthread);
282 log_warn("continuing with less udp ports: %u",
283 cfg->outgoing_num_ports);
284 log_warn("increase ulimit or decrease threads, "
285 "ports in config to remove this warning");
286 return;
287 #ifdef HAVE_SETRLIMIT
288 }
289 #endif
290 verbose(VERB_ALGO, "increased limit(open files) from %u to %u",
291 (unsigned)avail, (unsigned)total+10);
292 }
293 #else
294 (void)cfg;
295 #endif /* HAVE_GETRLIMIT */
296 #endif /* S_SPLINT_S */
297 }
298
299 /** set verbosity, check rlimits, cache settings */
300 static void
apply_settings(struct daemon * daemon,struct config_file * cfg,int cmdline_verbose,int debug_mode)301 apply_settings(struct daemon* daemon, struct config_file* cfg,
302 int cmdline_verbose, int debug_mode)
303 {
304 /* apply if they have changed */
305 verbosity = cmdline_verbose + cfg->verbosity;
306 if (debug_mode > 1) {
307 cfg->use_syslog = 0;
308 free(cfg->logfile);
309 cfg->logfile = NULL;
310 }
311 daemon_apply_cfg(daemon, cfg);
312 checkrlimits(cfg);
313
314 if (cfg->use_systemd && cfg->do_daemonize) {
315 log_warn("use-systemd and do-daemonize should not be enabled at the same time");
316 }
317
318 log_ident_set_or_default(cfg->log_identity);
319 }
320
321 #ifdef HAVE_KILL
322 /** Read existing pid from pidfile.
323 * @param file: file name of pid file.
324 * @return: the pid from the file or -1 if none.
325 */
326 static pid_t
readpid(const char * file)327 readpid (const char* file)
328 {
329 int fd;
330 pid_t pid;
331 char pidbuf[32];
332 char* t;
333 ssize_t l;
334
335 if ((fd = open(file, O_RDONLY)) == -1) {
336 if(errno != ENOENT)
337 log_err("Could not read pidfile %s: %s",
338 file, strerror(errno));
339 return -1;
340 }
341
342 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) {
343 if(errno != ENOENT)
344 log_err("Could not read pidfile %s: %s",
345 file, strerror(errno));
346 close(fd);
347 return -1;
348 }
349
350 close(fd);
351
352 /* Empty pidfile means no pidfile... */
353 if (l == 0) {
354 return -1;
355 }
356
357 pidbuf[sizeof(pidbuf)-1] = 0;
358 pid = (pid_t)strtol(pidbuf, &t, 10);
359
360 if (*t && *t != '\n') {
361 return -1;
362 }
363 return pid;
364 }
365
366 /** write pid to file.
367 * @param pidfile: file name of pid file.
368 * @param pid: pid to write to file.
369 * @return false on failure
370 */
371 static int
writepid(const char * pidfile,pid_t pid)372 writepid (const char* pidfile, pid_t pid)
373 {
374 int fd;
375 char pidbuf[32];
376 size_t count = 0;
377 snprintf(pidbuf, sizeof(pidbuf), "%lu\n", (unsigned long)pid);
378
379 if((fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC
380 #ifdef O_NOFOLLOW
381 | O_NOFOLLOW
382 #endif
383 , 0644)) == -1) {
384 log_err("cannot open pidfile %s: %s",
385 pidfile, strerror(errno));
386 return 0;
387 }
388 while(count < strlen(pidbuf)) {
389 ssize_t r = write(fd, pidbuf+count, strlen(pidbuf)-count);
390 if(r == -1) {
391 if(errno == EAGAIN || errno == EINTR)
392 continue;
393 log_err("cannot write to pidfile %s: %s",
394 pidfile, strerror(errno));
395 close(fd);
396 return 0;
397 } else if(r == 0) {
398 log_err("cannot write any bytes to pidfile %s: "
399 "write returns 0 bytes written", pidfile);
400 close(fd);
401 return 0;
402 }
403 count += r;
404 }
405 close(fd);
406 return 1;
407 }
408
409 /**
410 * check old pid file.
411 * @param pidfile: the file name of the pid file.
412 * @param inchroot: if pidfile is inchroot and we can thus expect to
413 * be able to delete it.
414 */
415 static void
checkoldpid(char * pidfile,int inchroot)416 checkoldpid(char* pidfile, int inchroot)
417 {
418 pid_t old;
419 if((old = readpid(pidfile)) != -1) {
420 /* see if it is still alive */
421 if(kill(old, 0) == 0 || errno == EPERM)
422 log_warn("unbound is already running as pid %u.",
423 (unsigned)old);
424 else if(inchroot)
425 log_warn("did not exit gracefully last time (%u)",
426 (unsigned)old);
427 }
428 }
429 #endif /* HAVE_KILL */
430
431 /** detach from command line */
432 static void
detach(void)433 detach(void)
434 {
435 #if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON)
436 /* use POSIX daemon(3) function */
437 if(daemon(1, 0) != 0)
438 fatal_exit("daemon failed: %s", strerror(errno));
439 #else /* no HAVE_DAEMON */
440 #ifdef HAVE_FORK
441 int fd;
442 /* Take off... */
443 switch (fork()) {
444 case 0:
445 break;
446 case -1:
447 fatal_exit("fork failed: %s", strerror(errno));
448 default:
449 /* exit interactive session */
450 exit(0);
451 }
452 /* detach */
453 #ifdef HAVE_SETSID
454 if(setsid() == -1)
455 fatal_exit("setsid() failed: %s", strerror(errno));
456 #endif
457 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
458 (void)dup2(fd, STDIN_FILENO);
459 (void)dup2(fd, STDOUT_FILENO);
460 (void)dup2(fd, STDERR_FILENO);
461 if (fd > 2)
462 (void)close(fd);
463 }
464 #endif /* HAVE_FORK */
465 #endif /* HAVE_DAEMON */
466 }
467
468 /** daemonize, drop user privileges and chroot if needed */
469 static void
perform_setup(struct daemon * daemon,struct config_file * cfg,int debug_mode,const char ** cfgfile,int need_pidfile)470 perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode,
471 const char** cfgfile, int need_pidfile)
472 {
473 #ifdef HAVE_KILL
474 int pidinchroot;
475 #endif
476 #ifdef HAVE_GETPWNAM
477 struct passwd *pwd = NULL;
478
479 if(cfg->username && cfg->username[0]) {
480 if((pwd = getpwnam(cfg->username)) == NULL)
481 fatal_exit("user '%s' does not exist.", cfg->username);
482 /* endpwent below, in case we need pwd for setusercontext */
483 }
484 #endif
485 #ifdef UB_ON_WINDOWS
486 w_config_adjust_directory(cfg);
487 #endif
488
489 /* read ssl keys while superuser and outside chroot */
490 #ifdef HAVE_SSL
491 if(!(daemon->rc = daemon_remote_create(cfg)))
492 fatal_exit("could not set up remote-control");
493 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) {
494 if(!(daemon->listen_sslctx = listen_sslctx_create(
495 cfg->ssl_service_key, cfg->ssl_service_pem, NULL)))
496 fatal_exit("could not set up listen SSL_CTX");
497 if(cfg->tls_ciphers && cfg->tls_ciphers[0]) {
498 if (!SSL_CTX_set_cipher_list(daemon->listen_sslctx, cfg->tls_ciphers)) {
499 fatal_exit("failed to set tls-cipher %s", cfg->tls_ciphers);
500 }
501 }
502 #ifdef HAVE_SSL_CTX_SET_CIPHERSUITES
503 if(cfg->tls_ciphersuites && cfg->tls_ciphersuites[0]) {
504 if (!SSL_CTX_set_ciphersuites(daemon->listen_sslctx, cfg->tls_ciphersuites)) {
505 fatal_exit("failed to set tls-ciphersuites %s", cfg->tls_ciphersuites);
506 }
507 }
508 #endif
509 if(cfg->tls_session_ticket_keys.first &&
510 cfg->tls_session_ticket_keys.first->str[0] != 0) {
511 if(!listen_sslctx_setup_ticket_keys(daemon->listen_sslctx, cfg->tls_session_ticket_keys.first)) {
512 fatal_exit("could not set session ticket SSL_CTX");
513 }
514 }
515 }
516 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL,
517 cfg->tls_cert_bundle, cfg->tls_win_cert)))
518 fatal_exit("could not set up connect SSL_CTX");
519 #endif
520
521 /* init syslog (as root) if needed, before daemonize, otherwise
522 * a fork error could not be printed since daemonize closed stderr.*/
523 if(cfg->use_syslog) {
524 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir);
525 }
526 /* if using a logfile, we cannot open it because the logfile would
527 * be created with the wrong permissions, we cannot chown it because
528 * we cannot chown system logfiles, so we do not open at all.
529 * So, using a logfile, the user does not see errors unless -d is
530 * given to unbound on the commandline. */
531
532 #ifdef HAVE_KILL
533 /* true if pidfile is inside chrootdir, or nochroot */
534 pidinchroot = need_pidfile && (!(cfg->chrootdir && cfg->chrootdir[0]) ||
535 (cfg->chrootdir && cfg->chrootdir[0] &&
536 strncmp(cfg->pidfile, cfg->chrootdir,
537 strlen(cfg->chrootdir))==0));
538
539 /* check old pid file before forking */
540 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) {
541 /* calculate position of pidfile */
542 if(cfg->pidfile[0] == '/')
543 daemon->pidfile = strdup(cfg->pidfile);
544 else daemon->pidfile = fname_after_chroot(cfg->pidfile,
545 cfg, 1);
546 if(!daemon->pidfile)
547 fatal_exit("pidfile alloc: out of memory");
548 checkoldpid(daemon->pidfile, pidinchroot);
549 }
550 #endif
551
552 /* daemonize because pid is needed by the writepid func */
553 if(!debug_mode && cfg->do_daemonize) {
554 detach();
555 }
556
557 /* write new pidfile (while still root, so can be outside chroot) */
558 #ifdef HAVE_KILL
559 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) {
560 if(writepid(daemon->pidfile, getpid())) {
561 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1 &&
562 pidinchroot) {
563 # ifdef HAVE_CHOWN
564 if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) {
565 verbose(VERB_QUERY, "cannot chown %u.%u %s: %s",
566 (unsigned)cfg_uid, (unsigned)cfg_gid,
567 daemon->pidfile, strerror(errno));
568 }
569 # endif /* HAVE_CHOWN */
570 }
571 }
572 }
573 #else
574 (void)daemon;
575 (void)need_pidfile;
576 #endif /* HAVE_KILL */
577
578 /* Set user context */
579 #ifdef HAVE_GETPWNAM
580 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) {
581 #ifdef HAVE_SETUSERCONTEXT
582 /* setusercontext does initgroups, setuid, setgid, and
583 * also resource limits from login config, but we
584 * still call setresuid, setresgid to be sure to set all uid*/
585 if(setusercontext(NULL, pwd, cfg_uid, (unsigned)
586 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0)
587 log_warn("unable to setusercontext %s: %s",
588 cfg->username, strerror(errno));
589 #else
590 (void)pwd;
591 #endif /* HAVE_SETUSERCONTEXT */
592 }
593 #endif /* HAVE_GETPWNAM */
594
595 /* box into the chroot */
596 #ifdef HAVE_CHROOT
597 if(cfg->chrootdir && cfg->chrootdir[0]) {
598 if(chdir(cfg->chrootdir)) {
599 fatal_exit("unable to chdir to chroot %s: %s",
600 cfg->chrootdir, strerror(errno));
601 }
602 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir);
603 if(chroot(cfg->chrootdir))
604 fatal_exit("unable to chroot to %s: %s",
605 cfg->chrootdir, strerror(errno));
606 if(chdir("/"))
607 fatal_exit("unable to chdir to / in chroot %s: %s",
608 cfg->chrootdir, strerror(errno));
609 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir);
610 if(strncmp(*cfgfile, cfg->chrootdir,
611 strlen(cfg->chrootdir)) == 0)
612 (*cfgfile) += strlen(cfg->chrootdir);
613
614 /* adjust stored pidfile for chroot */
615 if(daemon->pidfile && daemon->pidfile[0] &&
616 strncmp(daemon->pidfile, cfg->chrootdir,
617 strlen(cfg->chrootdir))==0) {
618 char* old = daemon->pidfile;
619 daemon->pidfile = strdup(old+strlen(cfg->chrootdir));
620 free(old);
621 if(!daemon->pidfile)
622 log_err("out of memory in pidfile adjust");
623 }
624 daemon->chroot = strdup(cfg->chrootdir);
625 if(!daemon->chroot)
626 log_err("out of memory in daemon chroot dir storage");
627 }
628 #else
629 (void)cfgfile;
630 #endif
631 /* change to working directory inside chroot */
632 if(cfg->directory && cfg->directory[0]) {
633 char* dir = cfg->directory;
634 if(cfg->chrootdir && cfg->chrootdir[0] &&
635 strncmp(dir, cfg->chrootdir,
636 strlen(cfg->chrootdir)) == 0)
637 dir += strlen(cfg->chrootdir);
638 if(dir[0]) {
639 if(chdir(dir)) {
640 fatal_exit("Could not chdir to %s: %s",
641 dir, strerror(errno));
642 }
643 verbose(VERB_QUERY, "chdir to %s", dir);
644 }
645 }
646
647 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/
648 #ifdef HAVE_GETPWNAM
649 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) {
650 # ifdef HAVE_INITGROUPS
651 if(initgroups(cfg->username, cfg_gid) != 0)
652 log_warn("unable to initgroups %s: %s",
653 cfg->username, strerror(errno));
654 # endif /* HAVE_INITGROUPS */
655 # ifdef HAVE_ENDPWENT
656 endpwent();
657 # endif
658
659 #ifdef HAVE_SETRESGID
660 if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0)
661 #elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID)
662 if(setregid(cfg_gid,cfg_gid) != 0)
663 #else /* use setgid */
664 if(setgid(cfg_gid) != 0)
665 #endif /* HAVE_SETRESGID */
666 fatal_exit("unable to set group id of %s: %s",
667 cfg->username, strerror(errno));
668 #ifdef HAVE_SETRESUID
669 if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0)
670 #elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID)
671 if(setreuid(cfg_uid,cfg_uid) != 0)
672 #else /* use setuid */
673 if(setuid(cfg_uid) != 0)
674 #endif /* HAVE_SETRESUID */
675 fatal_exit("unable to set user id of %s: %s",
676 cfg->username, strerror(errno));
677 verbose(VERB_QUERY, "drop user privileges, run as %s",
678 cfg->username);
679 }
680 #endif /* HAVE_GETPWNAM */
681 /* file logging inited after chroot,chdir,setuid is done so that
682 * it would succeed on SIGHUP as well */
683 if(!cfg->use_syslog)
684 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir);
685 }
686
687 /**
688 * Run the daemon.
689 * @param cfgfile: the config file name.
690 * @param cmdline_verbose: verbosity resulting from commandline -v.
691 * These increase verbosity as specified in the config file.
692 * @param debug_mode: if set, do not daemonize.
693 * @param need_pidfile: if false, no pidfile is checked or created.
694 */
695 static void
run_daemon(const char * cfgfile,int cmdline_verbose,int debug_mode,int need_pidfile)696 run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode, int need_pidfile)
697 {
698 struct config_file* cfg = NULL;
699 struct daemon* daemon = NULL;
700 int done_setup = 0;
701
702 if(!(daemon = daemon_init()))
703 fatal_exit("alloc failure");
704 while(!daemon->need_to_exit) {
705 if(done_setup)
706 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING);
707 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING);
708
709 /* config stuff */
710 if(!(cfg = config_create()))
711 fatal_exit("Could not alloc config defaults");
712 if(!config_read(cfg, cfgfile, daemon->chroot)) {
713 if(errno != ENOENT)
714 fatal_exit("Could not read config file: %s."
715 " Maybe try unbound -dd, it stays on "
716 "the commandline to see more errors, "
717 "or unbound-checkconf", cfgfile);
718 log_warn("Continuing with default config settings");
719 }
720 apply_settings(daemon, cfg, cmdline_verbose, debug_mode);
721 if(!done_setup)
722 config_lookup_uid(cfg);
723
724 /* prepare */
725 if(!daemon_open_shared_ports(daemon))
726 fatal_exit("could not open ports");
727 if(!done_setup) {
728 perform_setup(daemon, cfg, debug_mode, &cfgfile, need_pidfile);
729 done_setup = 1;
730 } else {
731 /* reopen log after HUP to facilitate log rotation */
732 if(!cfg->use_syslog)
733 log_init(cfg->logfile, 0, cfg->chrootdir);
734 }
735 /* work */
736 daemon_fork(daemon);
737
738 /* clean up for restart */
739 verbose(VERB_ALGO, "cleanup.");
740 daemon_cleanup(daemon);
741 config_delete(cfg);
742 }
743 verbose(VERB_ALGO, "Exit cleanup.");
744 /* this unlink may not work if the pidfile is located outside
745 * of the chroot/workdir or we no longer have permissions */
746 if(daemon->pidfile) {
747 int fd;
748 /* truncate pidfile */
749 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644);
750 if(fd != -1)
751 close(fd);
752 /* delete pidfile */
753 unlink(daemon->pidfile);
754 }
755 daemon_delete(daemon);
756 }
757
758 /** getopt global, in case header files fail to declare it. */
759 extern int optind;
760 /** getopt global, in case header files fail to declare it. */
761 extern char* optarg;
762
763 /**
764 * main program. Set options given commandline arguments.
765 * @param argc: number of commandline arguments.
766 * @param argv: array of commandline arguments.
767 * @return: exit status of the program.
768 */
769 int
main(int argc,char * argv[])770 main(int argc, char* argv[])
771 {
772 int c;
773 const char* cfgfile = CONFIGFILE;
774 const char* winopt = NULL;
775 const char* log_ident_default;
776 int cmdline_verbose = 0;
777 int debug_mode = 0;
778 int need_pidfile = 1;
779
780 #ifdef UB_ON_WINDOWS
781 int cmdline_cfg = 0;
782 #endif
783
784 checklock_start();
785 log_init(NULL, 0, NULL);
786 log_ident_default = strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0];
787 log_ident_set_default(log_ident_default);
788 log_ident_set(log_ident_default);
789 /* parse the options */
790 while( (c=getopt(argc, argv, "c:dhpvw:V")) != -1) {
791 switch(c) {
792 case 'c':
793 cfgfile = optarg;
794 #ifdef UB_ON_WINDOWS
795 cmdline_cfg = 1;
796 #endif
797 break;
798 case 'v':
799 cmdline_verbose++;
800 verbosity++;
801 break;
802 case 'p':
803 need_pidfile = 0;
804 break;
805 case 'd':
806 debug_mode++;
807 break;
808 case 'w':
809 winopt = optarg;
810 break;
811 case 'V':
812 print_build_options();
813 return 0;
814 case '?':
815 case 'h':
816 default:
817 usage();
818 return 1;
819 }
820 }
821 argc -= optind;
822 /* argv += optind; not using further arguments */
823
824 if(winopt) {
825 #ifdef UB_ON_WINDOWS
826 wsvc_command_option(winopt, cfgfile, cmdline_verbose,
827 cmdline_cfg);
828 #else
829 fatal_exit("option not supported");
830 #endif
831 }
832
833 if(argc != 0) {
834 usage();
835 return 1;
836 }
837
838 run_daemon(cfgfile, cmdline_verbose, debug_mode, need_pidfile);
839 log_init(NULL, 0, NULL); /* close logfile */
840 #ifndef unbound_testbound
841 if(log_get_lock()) {
842 lock_basic_destroy((lock_basic_type*)log_get_lock());
843 }
844 #endif
845 return 0;
846 }
847