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