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