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 LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * 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/data/msgreply.h" 57 #include "util/module.h" 58 #include "util/net_help.h" 59 #include <signal.h> 60 #include <fcntl.h> 61 #include <openssl/crypto.h> 62 #ifdef HAVE_PWD_H 63 #include <pwd.h> 64 #endif 65 #ifdef HAVE_GRP_H 66 #include <grp.h> 67 #endif 68 69 #ifdef HAVE_SYS_RESOURCE_H 70 #include <sys/resource.h> 71 #endif 72 #ifdef HAVE_LOGIN_CAP_H 73 #include <login_cap.h> 74 #endif 75 76 #ifdef USE_MINI_EVENT 77 # ifdef USE_WINSOCK 78 # include "util/winsock_event.h" 79 # else 80 # include "util/mini_event.h" 81 # endif 82 #else 83 # include <event.h> 84 #endif 85 86 #ifdef UB_ON_WINDOWS 87 # include "winrc/win_svc.h" 88 #endif 89 90 /** global debug value to keep track of heap memory allocation */ 91 void* unbound_start_brk = 0; 92 93 #if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 94 static const char* ev_backend2str(int b) 95 { 96 switch(b) { 97 case EVBACKEND_SELECT: return "select"; 98 case EVBACKEND_POLL: return "poll"; 99 case EVBACKEND_EPOLL: return "epoll"; 100 case EVBACKEND_KQUEUE: return "kqueue"; 101 case EVBACKEND_DEVPOLL: return "devpoll"; 102 case EVBACKEND_PORT: return "evport"; 103 } 104 return "unknown"; 105 } 106 #endif 107 108 /** get the event system in use */ 109 static void get_event_sys(const char** n, const char** s, const char** m) 110 { 111 #ifdef USE_WINSOCK 112 *n = "event"; 113 *s = "winsock"; 114 *m = "WSAWaitForMultipleEvents"; 115 #elif defined(USE_MINI_EVENT) 116 *n = "mini-event"; 117 *s = "internal"; 118 *m = "select"; 119 #else 120 struct event_base* b; 121 *s = event_get_version(); 122 # ifdef HAVE_EVENT_BASE_GET_METHOD 123 *n = "libevent"; 124 b = event_base_new(); 125 *m = event_base_get_method(b); 126 # elif defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 127 *n = "libev"; 128 b = (struct event_base*)ev_default_loop(EVFLAG_AUTO); 129 *m = ev_backend2str(ev_backend((struct ev_loop*)b)); 130 # else 131 *n = "unknown"; 132 *m = "not obtainable"; 133 b = NULL; 134 # endif 135 # ifdef HAVE_EVENT_BASE_FREE 136 event_base_free(b); 137 # endif 138 #endif 139 } 140 141 /** print usage. */ 142 static void usage() 143 { 144 const char** m; 145 const char *evnm="event", *evsys="", *evmethod=""; 146 printf("usage: unbound [options]\n"); 147 printf(" start unbound daemon DNS resolver.\n"); 148 printf("-h this help\n"); 149 printf("-c file config file to read instead of %s\n", CONFIGFILE); 150 printf(" file format is described in unbound.conf(5).\n"); 151 printf("-d do not fork into the background.\n"); 152 printf("-v verbose (more times to increase verbosity)\n"); 153 #ifdef UB_ON_WINDOWS 154 printf("-w opt windows option: \n"); 155 printf(" install, remove - manage the services entry\n"); 156 printf(" service - used to start from services control panel\n"); 157 #endif 158 printf("Version %s\n", PACKAGE_VERSION); 159 get_event_sys(&evnm, &evsys, &evmethod); 160 printf("linked libs: %s %s (it uses %s), ldns %s, %s\n", 161 evnm, evsys, evmethod, ldns_version(), 162 SSLeay_version(SSLEAY_VERSION)); 163 printf("linked modules:"); 164 for(m = module_list_avail(); *m; m++) 165 printf(" %s", *m); 166 printf("\n"); 167 printf("configured for %s on %s with options:%s\n", 168 CONFIGURE_TARGET, CONFIGURE_DATE, CONFIGURE_BUILD_WITH); 169 printf("BSD licensed, see LICENSE in source package for details.\n"); 170 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 171 } 172 173 #ifndef unbound_testbound 174 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 175 { 176 log_assert(0); 177 return 0; 178 } 179 #endif 180 181 /** check file descriptor count */ 182 static void 183 checkrlimits(struct config_file* cfg) 184 { 185 #ifdef HAVE_GETRLIMIT 186 /* list has number of ports to listen to, ifs number addresses */ 187 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 188 (int)cfg->incoming_num_tcp:0)); 189 size_t listen_ifs = (size_t)(cfg->num_ifs==0? 190 ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 191 (cfg->do_ip6?1:0)):cfg->num_ifs); 192 size_t listen_num = list*listen_ifs; 193 size_t outudpnum = (size_t)cfg->outgoing_num_ports; 194 size_t outtcpnum = cfg->outgoing_num_tcp; 195 size_t misc = 4; /* logfile, pidfile, stdout... */ 196 size_t perthread_noudp = listen_num + outtcpnum + 197 2/*cmdpipe*/ + 2/*libevent*/ + misc; 198 size_t perthread = perthread_noudp + outudpnum; 199 200 #if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 201 int numthread = 1; /* it forks */ 202 #else 203 int numthread = (cfg->num_threads?cfg->num_threads:1); 204 #endif 205 size_t total = numthread * perthread + misc; 206 size_t avail; 207 struct rlimit rlim; 208 209 if(total > 1024 && 210 strncmp(event_get_version(), "mini-event", 10) == 0) { 211 log_warn("too many file descriptors requested. The builtin" 212 "mini-event cannot handle more than 1024. Config " 213 "for less fds or compile with libevent"); 214 if(numthread*perthread_noudp+15 > 1024) 215 fatal_exit("too much tcp. not enough fds."); 216 cfg->outgoing_num_ports = (int)((1024 217 - numthread*perthread_noudp 218 - 10 /* safety margin */) /numthread); 219 log_warn("continuing with less udp ports: %u", 220 cfg->outgoing_num_ports); 221 total = 1024; 222 } 223 if(perthread > 64 && 224 strncmp(event_get_version(), "winsock-event", 13) == 0) { 225 log_err("too many file descriptors requested. The winsock" 226 " event handler cannot handle more than 64 per " 227 " thread. Config for less fds"); 228 if(perthread_noudp+2 > 64) 229 fatal_exit("too much tcp. not enough fds."); 230 cfg->outgoing_num_ports = (int)((64 231 - perthread_noudp 232 - 2/* safety margin */)); 233 log_warn("continuing with less udp ports: %u", 234 cfg->outgoing_num_ports); 235 total = numthread*(perthread_noudp+ 236 (size_t)cfg->outgoing_num_ports)+misc; 237 } 238 if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 239 log_warn("getrlimit: %s", strerror(errno)); 240 return; 241 } 242 if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 243 return; 244 if((size_t)rlim.rlim_cur < total) { 245 avail = (size_t)rlim.rlim_cur; 246 rlim.rlim_cur = (rlim_t)(total + 10); 247 rlim.rlim_max = (rlim_t)(total + 10); 248 #ifdef HAVE_SETRLIMIT 249 if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 250 log_warn("setrlimit: %s", strerror(errno)); 251 #else 252 if(1) { 253 #endif 254 log_warn("cannot increase max open fds from %u to %u", 255 (unsigned)avail, (unsigned)total+10); 256 /* check that calculation below does not underflow, 257 * with 15 as margin */ 258 if(numthread*perthread_noudp+15 > avail) 259 fatal_exit("too much tcp. not enough fds."); 260 cfg->outgoing_num_ports = (int)((avail 261 - numthread*perthread_noudp 262 - 10 /* safety margin */) /numthread); 263 log_warn("continuing with less udp ports: %u", 264 cfg->outgoing_num_ports); 265 log_warn("increase ulimit or decrease threads, " 266 "ports in config to remove this warning"); 267 return; 268 } 269 log_warn("increased limit(open files) from %u to %u", 270 (unsigned)avail, (unsigned)total+10); 271 } 272 #else 273 (void)cfg; 274 #endif /* HAVE_GETRLIMIT */ 275 } 276 277 /** set verbosity, check rlimits, cache settings */ 278 static void 279 apply_settings(struct daemon* daemon, struct config_file* cfg, 280 int cmdline_verbose) 281 { 282 /* apply if they have changed */ 283 verbosity = cmdline_verbose + cfg->verbosity; 284 daemon_apply_cfg(daemon, cfg); 285 checkrlimits(cfg); 286 } 287 288 #ifdef HAVE_KILL 289 /** Read existing pid from pidfile. 290 * @param file: file name of pid file. 291 * @return: the pid from the file or -1 if none. 292 */ 293 static pid_t 294 readpid (const char* file) 295 { 296 int fd; 297 pid_t pid; 298 char pidbuf[32]; 299 char* t; 300 ssize_t l; 301 302 if ((fd = open(file, O_RDONLY)) == -1) { 303 if(errno != ENOENT) 304 log_err("Could not read pidfile %s: %s", 305 file, strerror(errno)); 306 return -1; 307 } 308 309 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 310 if(errno != ENOENT) 311 log_err("Could not read pidfile %s: %s", 312 file, strerror(errno)); 313 close(fd); 314 return -1; 315 } 316 317 close(fd); 318 319 /* Empty pidfile means no pidfile... */ 320 if (l == 0) { 321 return -1; 322 } 323 324 pidbuf[sizeof(pidbuf)-1] = 0; 325 pid = (pid_t)strtol(pidbuf, &t, 10); 326 327 if (*t && *t != '\n') { 328 return -1; 329 } 330 return pid; 331 } 332 333 /** write pid to file. 334 * @param pidfile: file name of pid file. 335 * @param pid: pid to write to file. 336 */ 337 static void 338 writepid (const char* pidfile, pid_t pid) 339 { 340 FILE* f; 341 342 if ((f = fopen(pidfile, "w")) == NULL ) { 343 log_err("cannot open pidfile %s: %s", 344 pidfile, strerror(errno)); 345 return; 346 } 347 if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 348 log_err("cannot write to pidfile %s: %s", 349 pidfile, strerror(errno)); 350 } 351 fclose(f); 352 } 353 354 /** 355 * check old pid file. 356 * @param pidfile: the file name of the pid file. 357 * @param inchroot: if pidfile is inchroot and we can thus expect to 358 * be able to delete it. 359 */ 360 static void 361 checkoldpid(char* pidfile, int inchroot) 362 { 363 pid_t old; 364 if((old = readpid(pidfile)) != -1) { 365 /* see if it is still alive */ 366 if(kill(old, 0) == 0 || errno == EPERM) 367 log_warn("unbound is already running as pid %u.", 368 (unsigned)old); 369 else if(inchroot) 370 log_warn("did not exit gracefully last time (%u)", 371 (unsigned)old); 372 } 373 } 374 #endif /* HAVE_KILL */ 375 376 /** detach from command line */ 377 static void 378 detach(void) 379 { 380 #if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 381 /* use POSIX daemon(3) function */ 382 if(daemon(1, 0) != 0) 383 fatal_exit("daemon failed: %s", strerror(errno)); 384 #else /* no HAVE_DAEMON */ 385 #ifdef HAVE_FORK 386 int fd; 387 /* Take off... */ 388 switch (fork()) { 389 case 0: 390 break; 391 case -1: 392 fatal_exit("fork failed: %s", strerror(errno)); 393 default: 394 /* exit interactive session */ 395 exit(0); 396 } 397 /* detach */ 398 #ifdef HAVE_SETSID 399 if(setsid() == -1) 400 fatal_exit("setsid() failed: %s", strerror(errno)); 401 #endif 402 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 403 (void)dup2(fd, STDIN_FILENO); 404 (void)dup2(fd, STDOUT_FILENO); 405 (void)dup2(fd, STDERR_FILENO); 406 if (fd > 2) 407 (void)close(fd); 408 } 409 #endif /* HAVE_FORK */ 410 #endif /* HAVE_DAEMON */ 411 } 412 413 /** daemonize, drop user priviliges and chroot if needed */ 414 static void 415 perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 416 const char** cfgfile) 417 { 418 #ifdef HAVE_GETPWNAM 419 struct passwd *pwd = NULL; 420 uid_t uid; 421 gid_t gid; 422 /* initialize, but not to 0 (root) */ 423 memset(&uid, 112, sizeof(uid)); 424 memset(&gid, 112, sizeof(gid)); 425 log_assert(cfg); 426 427 if(cfg->username && cfg->username[0]) { 428 if((pwd = getpwnam(cfg->username)) == NULL) 429 fatal_exit("user '%s' does not exist.", cfg->username); 430 uid = pwd->pw_uid; 431 gid = pwd->pw_gid; 432 /* endpwent below, in case we need pwd for setusercontext */ 433 } 434 #endif 435 436 /* init syslog (as root) if needed, before daemonize, otherwise 437 * a fork error could not be printed since daemonize closed stderr.*/ 438 if(cfg->use_syslog) { 439 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 440 } 441 /* if using a logfile, we cannot open it because the logfile would 442 * be created with the wrong permissions, we cannot chown it because 443 * we cannot chown system logfiles, so we do not open at all. 444 * So, using a logfile, the user does not see errors unless -d is 445 * given to unbound on the commandline. */ 446 447 /* read ssl keys while superuser and outside chroot */ 448 if(!(daemon->rc = daemon_remote_create(cfg))) 449 fatal_exit("could not set up remote-control"); 450 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 451 if(!(daemon->listen_sslctx = listen_sslctx_create( 452 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 453 fatal_exit("could not set up listen SSL_CTX"); 454 } 455 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 456 fatal_exit("could not set up connect SSL_CTX"); 457 458 #ifdef HAVE_KILL 459 /* check old pid file before forking */ 460 if(cfg->pidfile && cfg->pidfile[0]) { 461 /* calculate position of pidfile */ 462 if(cfg->pidfile[0] == '/') 463 daemon->pidfile = strdup(cfg->pidfile); 464 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 465 cfg, 1); 466 if(!daemon->pidfile) 467 fatal_exit("pidfile alloc: out of memory"); 468 checkoldpid(daemon->pidfile, 469 /* true if pidfile is inside chrootdir, or nochroot */ 470 !(cfg->chrootdir && cfg->chrootdir[0]) || 471 (cfg->chrootdir && cfg->chrootdir[0] && 472 strncmp(daemon->pidfile, cfg->chrootdir, 473 strlen(cfg->chrootdir))==0)); 474 } 475 #endif 476 477 /* daemonize because pid is needed by the writepid func */ 478 if(!debug_mode && cfg->do_daemonize) { 479 detach(); 480 } 481 482 /* write new pidfile (while still root, so can be outside chroot) */ 483 #ifdef HAVE_KILL 484 if(cfg->pidfile && cfg->pidfile[0]) { 485 writepid(daemon->pidfile, getpid()); 486 if(!(cfg->chrootdir && cfg->chrootdir[0]) || 487 (cfg->chrootdir && cfg->chrootdir[0] && 488 strncmp(daemon->pidfile, cfg->chrootdir, 489 strlen(cfg->chrootdir))==0)) { 490 /* delete of pidfile could potentially work, 491 * chown to get permissions */ 492 if(cfg->username && cfg->username[0]) { 493 if(chown(daemon->pidfile, uid, gid) == -1) { 494 log_err("cannot chown %u.%u %s: %s", 495 (unsigned)uid, (unsigned)gid, 496 daemon->pidfile, strerror(errno)); 497 } 498 } 499 } 500 } 501 #else 502 (void)daemon; 503 #endif 504 505 /* Set user context */ 506 #ifdef HAVE_GETPWNAM 507 if(cfg->username && cfg->username[0]) { 508 #ifdef HAVE_SETUSERCONTEXT 509 /* setusercontext does initgroups, setuid, setgid, and 510 * also resource limits from login config, but we 511 * still call setresuid, setresgid to be sure to set all uid*/ 512 if(setusercontext(NULL, pwd, uid, 513 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 514 log_warn("unable to setusercontext %s: %s", 515 cfg->username, strerror(errno)); 516 #endif /* HAVE_SETUSERCONTEXT */ 517 } 518 #endif /* HAVE_GETPWNAM */ 519 520 /* box into the chroot */ 521 #ifdef HAVE_CHROOT 522 if(cfg->chrootdir && cfg->chrootdir[0]) { 523 if(chdir(cfg->chrootdir)) { 524 fatal_exit("unable to chdir to chroot %s: %s", 525 cfg->chrootdir, strerror(errno)); 526 } 527 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 528 if(chroot(cfg->chrootdir)) 529 fatal_exit("unable to chroot to %s: %s", 530 cfg->chrootdir, strerror(errno)); 531 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 532 if(strncmp(*cfgfile, cfg->chrootdir, 533 strlen(cfg->chrootdir)) == 0) 534 (*cfgfile) += strlen(cfg->chrootdir); 535 536 /* adjust stored pidfile for chroot */ 537 if(daemon->pidfile && daemon->pidfile[0] && 538 strncmp(daemon->pidfile, cfg->chrootdir, 539 strlen(cfg->chrootdir))==0) { 540 char* old = daemon->pidfile; 541 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 542 free(old); 543 if(!daemon->pidfile) 544 log_err("out of memory in pidfile adjust"); 545 } 546 daemon->chroot = strdup(cfg->chrootdir); 547 if(!daemon->chroot) 548 log_err("out of memory in daemon chroot dir storage"); 549 } 550 #else 551 (void)cfgfile; 552 #endif 553 /* change to working directory inside chroot */ 554 if(cfg->directory && cfg->directory[0]) { 555 char* dir = cfg->directory; 556 if(cfg->chrootdir && cfg->chrootdir[0] && 557 strncmp(dir, cfg->chrootdir, 558 strlen(cfg->chrootdir)) == 0) 559 dir += strlen(cfg->chrootdir); 560 if(dir[0]) { 561 if(chdir(dir)) { 562 fatal_exit("Could not chdir to %s: %s", 563 dir, strerror(errno)); 564 } 565 verbose(VERB_QUERY, "chdir to %s", dir); 566 } 567 } 568 569 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 570 #ifdef HAVE_GETPWNAM 571 if(cfg->username && cfg->username[0]) { 572 # ifdef HAVE_INITGROUPS 573 if(initgroups(cfg->username, gid) != 0) 574 log_warn("unable to initgroups %s: %s", 575 cfg->username, strerror(errno)); 576 # endif /* HAVE_INITGROUPS */ 577 endpwent(); 578 579 #ifdef HAVE_SETRESGID 580 if(setresgid(gid,gid,gid) != 0) 581 #elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 582 if(setregid(gid,gid) != 0) 583 #else /* use setgid */ 584 if(setgid(gid) != 0) 585 #endif /* HAVE_SETRESGID */ 586 fatal_exit("unable to set group id of %s: %s", 587 cfg->username, strerror(errno)); 588 #ifdef HAVE_SETRESUID 589 if(setresuid(uid,uid,uid) != 0) 590 #elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 591 if(setreuid(uid,uid) != 0) 592 #else /* use setuid */ 593 if(setuid(uid) != 0) 594 #endif /* HAVE_SETRESUID */ 595 fatal_exit("unable to set user id of %s: %s", 596 cfg->username, strerror(errno)); 597 verbose(VERB_QUERY, "drop user privileges, run as %s", 598 cfg->username); 599 } 600 #endif /* HAVE_GETPWNAM */ 601 /* file logging inited after chroot,chdir,setuid is done so that 602 * it would succeed on SIGHUP as well */ 603 if(!cfg->use_syslog) 604 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 605 } 606 607 /** 608 * Run the daemon. 609 * @param cfgfile: the config file name. 610 * @param cmdline_verbose: verbosity resulting from commandline -v. 611 * These increase verbosity as specified in the config file. 612 * @param debug_mode: if set, do not daemonize. 613 */ 614 static void 615 run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 616 { 617 struct config_file* cfg = NULL; 618 struct daemon* daemon = NULL; 619 int done_setup = 0; 620 621 if(!(daemon = daemon_init())) 622 fatal_exit("alloc failure"); 623 while(!daemon->need_to_exit) { 624 if(done_setup) 625 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 626 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 627 628 /* config stuff */ 629 if(!(cfg = config_create())) 630 fatal_exit("Could not alloc config defaults"); 631 if(!config_read(cfg, cfgfile, daemon->chroot)) { 632 if(errno != ENOENT) 633 fatal_exit("Could not read config file: %s", 634 cfgfile); 635 log_warn("Continuing with default config settings"); 636 } 637 apply_settings(daemon, cfg, cmdline_verbose); 638 639 /* prepare */ 640 if(!daemon_open_shared_ports(daemon)) 641 fatal_exit("could not open ports"); 642 if(!done_setup) { 643 perform_setup(daemon, cfg, debug_mode, &cfgfile); 644 done_setup = 1; 645 } else { 646 /* reopen log after HUP to facilitate log rotation */ 647 if(!cfg->use_syslog) 648 log_init(cfg->logfile, 0, cfg->chrootdir); 649 } 650 /* work */ 651 daemon_fork(daemon); 652 653 /* clean up for restart */ 654 verbose(VERB_ALGO, "cleanup."); 655 daemon_cleanup(daemon); 656 config_delete(cfg); 657 } 658 verbose(VERB_ALGO, "Exit cleanup."); 659 /* this unlink may not work if the pidfile is located outside 660 * of the chroot/workdir or we no longer have permissions */ 661 if(daemon->pidfile) { 662 int fd; 663 /* truncate pidfile */ 664 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 665 if(fd != -1) 666 close(fd); 667 /* delete pidfile */ 668 unlink(daemon->pidfile); 669 } 670 daemon_delete(daemon); 671 } 672 673 /** getopt global, in case header files fail to declare it. */ 674 extern int optind; 675 /** getopt global, in case header files fail to declare it. */ 676 extern char* optarg; 677 678 /** 679 * main program. Set options given commandline arguments. 680 * @param argc: number of commandline arguments. 681 * @param argv: array of commandline arguments. 682 * @return: exit status of the program. 683 */ 684 int 685 main(int argc, char* argv[]) 686 { 687 int c; 688 const char* cfgfile = CONFIGFILE; 689 const char* winopt = NULL; 690 int cmdline_verbose = 0; 691 int debug_mode = 0; 692 #ifdef UB_ON_WINDOWS 693 int cmdline_cfg = 0; 694 #endif 695 696 #ifdef HAVE_SBRK 697 /* take debug snapshot of heap */ 698 unbound_start_brk = sbrk(0); 699 #endif 700 701 log_init(NULL, 0, NULL); 702 /* parse the options */ 703 while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 704 switch(c) { 705 case 'c': 706 cfgfile = optarg; 707 #ifdef UB_ON_WINDOWS 708 cmdline_cfg = 1; 709 #endif 710 break; 711 case 'v': 712 cmdline_verbose ++; 713 verbosity++; 714 break; 715 case 'd': 716 debug_mode = 1; 717 break; 718 case 'w': 719 winopt = optarg; 720 break; 721 case '?': 722 case 'h': 723 default: 724 usage(); 725 return 1; 726 } 727 } 728 argc -= optind; 729 argv += optind; 730 731 if(winopt) { 732 #ifdef UB_ON_WINDOWS 733 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 734 cmdline_cfg); 735 #else 736 fatal_exit("option not supported"); 737 #endif 738 } 739 740 if(argc != 0) { 741 usage(); 742 return 1; 743 } 744 745 run_daemon(cfgfile, cmdline_verbose, debug_mode); 746 log_init(NULL, 0, NULL); /* close logfile */ 747 return 0; 748 } 749