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