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