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 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 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 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 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 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 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 */ 370 static void 371 writepid (const char* pidfile, pid_t pid) 372 { 373 int fd; 374 char pidbuf[32]; 375 size_t count = 0; 376 snprintf(pidbuf, sizeof(pidbuf), "%lu\n", (unsigned long)pid); 377 378 if((fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC 379 #ifdef O_NOFOLLOW 380 | O_NOFOLLOW 381 #endif 382 , 0644)) == -1) { 383 log_err("cannot open pidfile %s: %s", 384 pidfile, strerror(errno)); 385 return; 386 } 387 while(count < strlen(pidbuf)) { 388 ssize_t r = write(fd, pidbuf+count, strlen(pidbuf)-count); 389 if(r == -1) { 390 if(errno == EAGAIN || errno == EINTR) 391 continue; 392 log_err("cannot write to pidfile %s: %s", 393 pidfile, strerror(errno)); 394 close(fd); 395 return; 396 } else if(r == 0) { 397 log_err("cannot write any bytes to pidfile %s: " 398 "write returns 0 bytes written", pidfile); 399 close(fd); 400 return; 401 } 402 count += r; 403 } 404 close(fd); 405 } 406 407 /** 408 * check old pid file. 409 * @param pidfile: the file name of the pid file. 410 * @param inchroot: if pidfile is inchroot and we can thus expect to 411 * be able to delete it. 412 */ 413 static void 414 checkoldpid(char* pidfile, int inchroot) 415 { 416 pid_t old; 417 if((old = readpid(pidfile)) != -1) { 418 /* see if it is still alive */ 419 if(kill(old, 0) == 0 || errno == EPERM) 420 log_warn("unbound is already running as pid %u.", 421 (unsigned)old); 422 else if(inchroot) 423 log_warn("did not exit gracefully last time (%u)", 424 (unsigned)old); 425 } 426 } 427 #endif /* HAVE_KILL */ 428 429 /** detach from command line */ 430 static void 431 detach(void) 432 { 433 #if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 434 /* use POSIX daemon(3) function */ 435 if(daemon(1, 0) != 0) 436 fatal_exit("daemon failed: %s", strerror(errno)); 437 #else /* no HAVE_DAEMON */ 438 #ifdef HAVE_FORK 439 int fd; 440 /* Take off... */ 441 switch (fork()) { 442 case 0: 443 break; 444 case -1: 445 fatal_exit("fork failed: %s", strerror(errno)); 446 default: 447 /* exit interactive session */ 448 exit(0); 449 } 450 /* detach */ 451 #ifdef HAVE_SETSID 452 if(setsid() == -1) 453 fatal_exit("setsid() failed: %s", strerror(errno)); 454 #endif 455 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 456 (void)dup2(fd, STDIN_FILENO); 457 (void)dup2(fd, STDOUT_FILENO); 458 (void)dup2(fd, STDERR_FILENO); 459 if (fd > 2) 460 (void)close(fd); 461 } 462 #endif /* HAVE_FORK */ 463 #endif /* HAVE_DAEMON */ 464 } 465 466 /* setup a listening ssl context, fatal_exit() on any failure */ 467 static void 468 setup_listen_sslctx(void** ctx, int is_dot, int is_doh, struct config_file* cfg) 469 { 470 #ifdef HAVE_SSL 471 if(!(*ctx = listen_sslctx_create( 472 cfg->ssl_service_key, cfg->ssl_service_pem, NULL, 473 cfg->tls_ciphers, cfg->tls_ciphersuites, 474 (cfg->tls_session_ticket_keys.first && 475 cfg->tls_session_ticket_keys.first->str[0] != 0), 476 is_dot, is_doh))) { 477 fatal_exit("could not set up listen SSL_CTX"); 478 } 479 #else /* HAVE_SSL */ 480 (void)ctx;(void)is_dot;(void)is_doh;(void)cfg; 481 #endif /* HAVE_SSL */ 482 } 483 484 /* setups the needed ssl contexts, fatal_exit() on any failure */ 485 static void 486 setup_sslctxs(struct daemon* daemon, struct config_file* cfg) 487 { 488 #ifdef HAVE_SSL 489 if(!(daemon->rc = daemon_remote_create(cfg))) 490 fatal_exit("could not set up remote-control"); 491 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 492 /* setup the session keys; the callback to use them will be 493 * attached to each sslctx separately */ 494 if(cfg->tls_session_ticket_keys.first && 495 cfg->tls_session_ticket_keys.first->str[0] != 0) { 496 if(!listen_sslctx_setup_ticket_keys( 497 cfg->tls_session_ticket_keys.first)) { 498 fatal_exit("could not set session ticket SSL_CTX"); 499 } 500 } 501 (void)setup_listen_sslctx(&daemon->listen_dot_sslctx, 1, 0, cfg); 502 #ifdef HAVE_NGHTTP2_NGHTTP2_H 503 if(cfg_has_https(cfg)) { 504 (void)setup_listen_sslctx(&daemon->listen_doh_sslctx, 0, 1, cfg); 505 } 506 #endif 507 #ifdef HAVE_NGTCP2 508 if(cfg_has_quic(cfg)) { 509 if(!(daemon->listen_quic_sslctx = quic_sslctx_create( 510 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) { 511 fatal_exit("could not set up quic SSL_CTX"); 512 } 513 } 514 #endif /* HAVE_NGTCP2 */ 515 } 516 if(!(daemon->connect_dot_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 #else /* HAVE_SSL */ 520 (void)daemon;(void)cfg; 521 #endif /* HAVE_SSL */ 522 } 523 524 /** daemonize, drop user privileges and chroot if needed */ 525 static void 526 perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 527 const char** cfgfile, int need_pidfile) 528 { 529 #ifdef HAVE_KILL 530 int pidinchroot; 531 #endif 532 #ifdef HAVE_GETPWNAM 533 struct passwd *pwd = NULL; 534 #endif 535 536 if(!daemon_privileged(daemon)) 537 fatal_exit("could not do privileged setup"); 538 #ifdef HAVE_GETPWNAM 539 if(cfg->username && cfg->username[0]) { 540 if((pwd = getpwnam(cfg->username)) == NULL) 541 fatal_exit("user '%s' does not exist.", cfg->username); 542 /* endpwent below, in case we need pwd for setusercontext */ 543 } 544 #endif 545 #ifdef UB_ON_WINDOWS 546 w_config_adjust_directory(cfg); 547 #endif 548 549 /* read ssl keys while superuser and outside chroot */ 550 (void)setup_sslctxs(daemon, cfg); 551 552 /* init syslog (as root) if needed, before daemonize, otherwise 553 * a fork error could not be printed since daemonize closed stderr.*/ 554 if(cfg->use_syslog) { 555 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 556 } 557 /* if using a logfile, we cannot open it because the logfile would 558 * be created with the wrong permissions, we cannot chown it because 559 * we cannot chown system logfiles, so we do not open at all. 560 * So, using a logfile, the user does not see errors unless -d is 561 * given to unbound on the commandline. */ 562 563 #ifdef HAVE_KILL 564 /* true if pidfile is inside chrootdir, or nochroot */ 565 pidinchroot = need_pidfile && (!(cfg->chrootdir && cfg->chrootdir[0]) || 566 (cfg->chrootdir && cfg->chrootdir[0] && 567 strncmp(cfg->pidfile, cfg->chrootdir, 568 strlen(cfg->chrootdir))==0)); 569 570 /* check old pid file before forking */ 571 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 572 /* calculate position of pidfile */ 573 if(cfg->pidfile[0] == '/') 574 daemon->pidfile = strdup(cfg->pidfile); 575 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 576 cfg, 1); 577 if(!daemon->pidfile) 578 fatal_exit("pidfile alloc: out of memory"); 579 /* Check old pid if there is no username configured. 580 * With a username, the assumption is that the privilege 581 * drop makes a pidfile not removed when the server stopped 582 * last time. The server does not chown the pidfile for it, 583 * because that creates privilege escape problems, with the 584 * pidfile writable by unprivileged users, but used by 585 * privileged users. */ 586 if(!(cfg->username && cfg->username[0])) 587 checkoldpid(daemon->pidfile, pidinchroot); 588 } 589 #endif 590 591 /* daemonize because pid is needed by the writepid func */ 592 if(!debug_mode && cfg->do_daemonize) { 593 detach(); 594 } 595 596 /* write new pidfile (while still root, so can be outside chroot) */ 597 #ifdef HAVE_KILL 598 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 599 writepid(daemon->pidfile, getpid()); 600 } 601 #else 602 (void)daemon; 603 (void)need_pidfile; 604 #endif /* HAVE_KILL */ 605 606 /* Set user context */ 607 #ifdef HAVE_GETPWNAM 608 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 609 #ifdef HAVE_SETUSERCONTEXT 610 /* setusercontext does initgroups, setuid, setgid, and 611 * also resource limits from login config, but we 612 * still call setresuid, setresgid to be sure to set all uid*/ 613 if(setusercontext(NULL, pwd, cfg_uid, (unsigned) 614 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 615 log_warn("unable to setusercontext %s: %s", 616 cfg->username, strerror(errno)); 617 #else 618 (void)pwd; 619 #endif /* HAVE_SETUSERCONTEXT */ 620 } 621 #endif /* HAVE_GETPWNAM */ 622 623 /* box into the chroot */ 624 #ifdef HAVE_CHROOT 625 if(cfg->chrootdir && cfg->chrootdir[0]) { 626 if(chdir(cfg->chrootdir)) { 627 fatal_exit("unable to chdir to chroot %s: %s", 628 cfg->chrootdir, strerror(errno)); 629 } 630 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 631 if(chroot(cfg->chrootdir)) 632 fatal_exit("unable to chroot to %s: %s", 633 cfg->chrootdir, strerror(errno)); 634 if(chdir("/")) 635 fatal_exit("unable to chdir to / in chroot %s: %s", 636 cfg->chrootdir, strerror(errno)); 637 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 638 if(strncmp(*cfgfile, cfg->chrootdir, 639 strlen(cfg->chrootdir)) == 0) 640 (*cfgfile) += strlen(cfg->chrootdir); 641 642 /* adjust stored pidfile for chroot */ 643 if(daemon->pidfile && daemon->pidfile[0] && 644 strncmp(daemon->pidfile, cfg->chrootdir, 645 strlen(cfg->chrootdir))==0) { 646 char* old = daemon->pidfile; 647 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 648 free(old); 649 if(!daemon->pidfile) 650 log_err("out of memory in pidfile adjust"); 651 } 652 daemon->chroot = strdup(cfg->chrootdir); 653 if(!daemon->chroot) 654 log_err("out of memory in daemon chroot dir storage"); 655 } 656 #else 657 (void)cfgfile; 658 #endif 659 /* change to working directory inside chroot */ 660 if(cfg->directory && cfg->directory[0]) { 661 char* dir = cfg->directory; 662 if(cfg->chrootdir && cfg->chrootdir[0] && 663 strncmp(dir, cfg->chrootdir, 664 strlen(cfg->chrootdir)) == 0) 665 dir += strlen(cfg->chrootdir); 666 if(dir[0]) { 667 if(chdir(dir)) { 668 fatal_exit("Could not chdir to %s: %s", 669 dir, strerror(errno)); 670 } 671 verbose(VERB_QUERY, "chdir to %s", dir); 672 } 673 } 674 675 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 676 #ifdef HAVE_GETPWNAM 677 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 678 # ifdef HAVE_INITGROUPS 679 if(initgroups(cfg->username, cfg_gid) != 0) 680 log_warn("unable to initgroups %s: %s", 681 cfg->username, strerror(errno)); 682 # endif /* HAVE_INITGROUPS */ 683 # ifdef HAVE_ENDPWENT 684 endpwent(); 685 # endif 686 687 #ifdef HAVE_SETRESGID 688 if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0) 689 #elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 690 if(setregid(cfg_gid,cfg_gid) != 0) 691 #else /* use setgid */ 692 if(setgid(cfg_gid) != 0) 693 #endif /* HAVE_SETRESGID */ 694 fatal_exit("unable to set group id of %s: %s", 695 cfg->username, strerror(errno)); 696 #ifdef HAVE_SETRESUID 697 if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0) 698 #elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 699 if(setreuid(cfg_uid,cfg_uid) != 0) 700 #else /* use setuid */ 701 if(setuid(cfg_uid) != 0) 702 #endif /* HAVE_SETRESUID */ 703 fatal_exit("unable to set user id of %s: %s", 704 cfg->username, strerror(errno)); 705 verbose(VERB_QUERY, "drop user privileges, run as %s", 706 cfg->username); 707 } 708 #endif /* HAVE_GETPWNAM */ 709 /* file logging inited after chroot,chdir,setuid is done so that 710 * it would succeed on SIGHUP as well */ 711 if(!cfg->use_syslog) 712 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 713 daemon->cfgfile = strdup(*cfgfile); 714 if(!daemon->cfgfile) 715 fatal_exit("out of memory in daemon cfgfile strdup"); 716 } 717 718 /** 719 * Run the daemon. 720 * @param cfgfile: the config file name. 721 * @param cmdline_verbose: verbosity resulting from commandline -v. 722 * These increase verbosity as specified in the config file. 723 * @param debug_mode: if set, do not daemonize. 724 * @param need_pidfile: if false, no pidfile is checked or created. 725 */ 726 static void 727 run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode, int need_pidfile) 728 { 729 struct config_file* cfg = NULL; 730 struct daemon* daemon = NULL; 731 int done_setup = 0; 732 733 if(!(daemon = daemon_init())) 734 fatal_exit("alloc failure"); 735 while(!daemon->need_to_exit) { 736 if(done_setup) 737 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 738 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 739 740 /* config stuff */ 741 if(!(cfg = config_create())) 742 fatal_exit("Could not alloc config defaults"); 743 if(!config_read(cfg, cfgfile, daemon->chroot)) { 744 if(errno != ENOENT) 745 fatal_exit("Could not read config file: %s." 746 " Maybe try unbound -dd, it stays on " 747 "the commandline to see more errors, " 748 "or unbound-checkconf", cfgfile); 749 log_warn("Continuing with default config settings"); 750 } 751 apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 752 if(!done_setup) 753 config_lookup_uid(cfg); 754 755 /* prepare */ 756 if(!daemon_open_shared_ports(daemon)) 757 fatal_exit("could not open ports"); 758 if(!done_setup) { 759 perform_setup(daemon, cfg, debug_mode, &cfgfile, need_pidfile); 760 done_setup = 1; 761 } else { 762 /* reopen log after HUP to facilitate log rotation */ 763 if(!cfg->use_syslog) 764 log_init(cfg->logfile, 0, cfg->chrootdir); 765 } 766 /* work */ 767 daemon_fork(daemon); 768 769 /* clean up for restart */ 770 verbose(VERB_ALGO, "cleanup."); 771 daemon_cleanup(daemon); 772 config_delete(cfg); 773 } 774 verbose(VERB_ALGO, "Exit cleanup."); 775 /* this unlink may not work if the pidfile is located outside 776 * of the chroot/workdir or we no longer have permissions */ 777 if(daemon->pidfile) { 778 int fd; 779 /* truncate pidfile */ 780 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC 781 #ifdef O_NOFOLLOW 782 | O_NOFOLLOW 783 #endif 784 , 0644); 785 if(fd != -1) 786 close(fd); 787 /* delete pidfile */ 788 unlink(daemon->pidfile); 789 } 790 daemon_delete(daemon); 791 } 792 793 /** getopt global, in case header files fail to declare it. */ 794 extern int optind; 795 /** getopt global, in case header files fail to declare it. */ 796 extern char* optarg; 797 798 /** 799 * main program. Set options given commandline arguments. 800 * @param argc: number of commandline arguments. 801 * @param argv: array of commandline arguments. 802 * @return: exit status of the program. 803 */ 804 int 805 main(int argc, char* argv[]) 806 { 807 int c; 808 const char* cfgfile = CONFIGFILE; 809 const char* winopt = NULL; 810 const char* log_ident_default; 811 int cmdline_verbose = 0; 812 int debug_mode = 0; 813 int need_pidfile = 1; 814 815 #ifdef UB_ON_WINDOWS 816 int cmdline_cfg = 0; 817 #endif 818 819 checklock_start(); 820 log_init(NULL, 0, NULL); 821 log_ident_default = strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]; 822 log_ident_set_default(log_ident_default); 823 log_ident_set(log_ident_default); 824 /* parse the options */ 825 while( (c=getopt(argc, argv, "c:dhpvw:V")) != -1) { 826 switch(c) { 827 case 'c': 828 cfgfile = optarg; 829 #ifdef UB_ON_WINDOWS 830 cmdline_cfg = 1; 831 #endif 832 break; 833 case 'v': 834 cmdline_verbose++; 835 verbosity++; 836 break; 837 case 'p': 838 need_pidfile = 0; 839 break; 840 case 'd': 841 debug_mode++; 842 break; 843 case 'w': 844 winopt = optarg; 845 break; 846 case 'V': 847 print_build_options(); 848 return 0; 849 case '?': 850 case 'h': 851 default: 852 usage(); 853 return 1; 854 } 855 } 856 argc -= optind; 857 /* argv += optind; not using further arguments */ 858 859 if(winopt) { 860 #ifdef UB_ON_WINDOWS 861 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 862 cmdline_cfg); 863 #else 864 fatal_exit("option not supported"); 865 #endif 866 } 867 868 if(argc != 0) { 869 usage(); 870 return 1; 871 } 872 873 run_daemon(cfgfile, cmdline_verbose, debug_mode, need_pidfile); 874 log_init(NULL, 0, NULL); /* close logfile */ 875 #ifndef unbound_testbound 876 if(log_get_lock()) { 877 lock_basic_destroy((lock_basic_type*)log_get_lock()); 878 } 879 #endif 880 return 0; 881 } 882