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/fptr_wlist.h" 57#include "util/data/msgreply.h" 58#include "util/module.h" 59#include "util/net_help.h" 60#include <signal.h> 61#include <fcntl.h> 62#include <openssl/crypto.h> 63#ifdef HAVE_PWD_H 64#include <pwd.h> 65#endif 66#ifdef HAVE_GRP_H 67#include <grp.h> 68#endif 69 70#ifdef HAVE_SYS_RESOURCE_H 71#include <sys/resource.h> 72#endif 73#ifdef HAVE_LOGIN_CAP_H 74#include <login_cap.h> 75#endif 76 77#ifdef USE_MINI_EVENT 78# ifdef USE_WINSOCK 79# include "util/winsock_event.h" 80# else 81# include "util/mini_event.h" 82# endif 83#else 84# include <event.h> 85#endif 86 87#ifdef UB_ON_WINDOWS 88# include "winrc/win_svc.h" 89#endif 90 91#ifdef HAVE_NSS 92/* nss3 */ 93# include "nss.h" 94#endif 95 96#ifdef HAVE_SBRK 97/** global debug value to keep track of heap memory allocation */ 98void* unbound_start_brk = 0; 99#endif 100 101#if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 102static const char* ev_backend2str(int b) 103{ 104 switch(b) { 105 case EVBACKEND_SELECT: return "select"; 106 case EVBACKEND_POLL: return "poll"; 107 case EVBACKEND_EPOLL: return "epoll"; 108 case EVBACKEND_KQUEUE: return "kqueue"; 109 case EVBACKEND_DEVPOLL: return "devpoll"; 110 case EVBACKEND_PORT: return "evport"; 111 } 112 return "unknown"; 113} 114#endif 115 116/** get the event system in use */ 117static void get_event_sys(const char** n, const char** s, const char** m) 118{ 119#ifdef USE_WINSOCK 120 *n = "event"; 121 *s = "winsock"; 122 *m = "WSAWaitForMultipleEvents"; 123#elif defined(USE_MINI_EVENT) 124 *n = "mini-event"; 125 *s = "internal"; 126 *m = "select"; 127#else 128 struct event_base* b; 129 *s = event_get_version(); 130# ifdef HAVE_EVENT_BASE_GET_METHOD 131 *n = "libevent"; 132 b = event_base_new(); 133 *m = event_base_get_method(b); 134# elif defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 135 *n = "libev"; 136 b = (struct event_base*)ev_default_loop(EVFLAG_AUTO); 137 *m = ev_backend2str(ev_backend((struct ev_loop*)b)); 138# else 139 *n = "unknown"; 140 *m = "not obtainable"; 141 b = NULL; 142# endif 143# ifdef HAVE_EVENT_BASE_FREE 144 event_base_free(b); 145# endif 146#endif 147} 148 149/** print usage. */ 150static void usage() 151{ 152 const char** m; 153 const char *evnm="event", *evsys="", *evmethod=""; 154 printf("usage: unbound [options]\n"); 155 printf(" start unbound daemon DNS resolver.\n"); 156 printf("-h this help\n"); 157 printf("-c file config file to read instead of %s\n", CONFIGFILE); 158 printf(" file format is described in unbound.conf(5).\n"); 159 printf("-d do not fork into the background.\n"); 160 printf("-v verbose (more times to increase verbosity)\n"); 161#ifdef UB_ON_WINDOWS 162 printf("-w opt windows option: \n"); 163 printf(" install, remove - manage the services entry\n"); 164 printf(" service - used to start from services control panel\n"); 165#endif 166 printf("Version %s\n", PACKAGE_VERSION); 167 get_event_sys(&evnm, &evsys, &evmethod); 168 printf("linked libs: %s %s (it uses %s), ldns %s, %s\n", 169 evnm, evsys, evmethod, ldns_version(), 170#ifdef HAVE_SSL 171 SSLeay_version(SSLEAY_VERSION) 172#elif defined(HAVE_NSS) 173 NSS_GetVersion() 174#endif 175 ); 176 printf("linked modules:"); 177 for(m = module_list_avail(); *m; m++) 178 printf(" %s", *m); 179 printf("\n"); 180 printf("BSD licensed, see LICENSE in source package for details.\n"); 181 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 182} 183 184#ifndef unbound_testbound 185int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 186{ 187 log_assert(0); 188 return 0; 189} 190#endif 191 192/** check file descriptor count */ 193static void 194checkrlimits(struct config_file* cfg) 195{ 196#ifdef HAVE_GETRLIMIT 197 /* list has number of ports to listen to, ifs number addresses */ 198 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 199 (int)cfg->incoming_num_tcp:0)); 200 size_t listen_ifs = (size_t)(cfg->num_ifs==0? 201 ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 202 (cfg->do_ip6?1:0)):cfg->num_ifs); 203 size_t listen_num = list*listen_ifs; 204 size_t outudpnum = (size_t)cfg->outgoing_num_ports; 205 size_t outtcpnum = cfg->outgoing_num_tcp; 206 size_t misc = 4; /* logfile, pidfile, stdout... */ 207 size_t perthread_noudp = listen_num + outtcpnum + 208 2/*cmdpipe*/ + 2/*libevent*/ + misc; 209 size_t perthread = perthread_noudp + outudpnum; 210 211#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 212 int numthread = 1; /* it forks */ 213#else 214 int numthread = (cfg->num_threads?cfg->num_threads:1); 215#endif 216 size_t total = numthread * perthread + misc; 217 size_t avail; 218 struct rlimit rlim; 219 220 if(total > 1024 && 221 strncmp(event_get_version(), "mini-event", 10) == 0) { 222 log_warn("too many file descriptors requested. The builtin" 223 "mini-event cannot handle more than 1024. Config " 224 "for less fds or compile with libevent"); 225 if(numthread*perthread_noudp+15 > 1024) 226 fatal_exit("too much tcp. not enough fds."); 227 cfg->outgoing_num_ports = (int)((1024 228 - numthread*perthread_noudp 229 - 10 /* safety margin */) /numthread); 230 log_warn("continuing with less udp ports: %u", 231 cfg->outgoing_num_ports); 232 total = 1024; 233 } 234 if(perthread > 64 && 235 strncmp(event_get_version(), "winsock-event", 13) == 0) { 236 log_err("too many file descriptors requested. The winsock" 237 " event handler cannot handle more than 64 per " 238 " thread. Config for less fds"); 239 if(perthread_noudp+2 > 64) 240 fatal_exit("too much tcp. not enough fds."); 241 cfg->outgoing_num_ports = (int)((64 242 - perthread_noudp 243 - 2/* safety margin */)); 244 log_warn("continuing with less udp ports: %u", 245 cfg->outgoing_num_ports); 246 total = numthread*(perthread_noudp+ 247 (size_t)cfg->outgoing_num_ports)+misc; 248 } 249 if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 250 log_warn("getrlimit: %s", strerror(errno)); 251 return; 252 } 253 if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 254 return; 255 if((size_t)rlim.rlim_cur < total) { 256 avail = (size_t)rlim.rlim_cur; 257 rlim.rlim_cur = (rlim_t)(total + 10); 258 rlim.rlim_max = (rlim_t)(total + 10); 259#ifdef HAVE_SETRLIMIT 260 if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 261 log_warn("setrlimit: %s", strerror(errno)); 262#else 263 if(1) { 264#endif 265 log_warn("cannot increase max open fds from %u to %u", 266 (unsigned)avail, (unsigned)total+10); 267 /* check that calculation below does not underflow, 268 * with 15 as margin */ 269 if(numthread*perthread_noudp+15 > avail) 270 fatal_exit("too much tcp. not enough fds."); 271 cfg->outgoing_num_ports = (int)((avail 272 - numthread*perthread_noudp 273 - 10 /* safety margin */) /numthread); 274 log_warn("continuing with less udp ports: %u", 275 cfg->outgoing_num_ports); 276 log_warn("increase ulimit or decrease threads, " 277 "ports in config to remove this warning"); 278 return; 279 } 280 log_warn("increased limit(open files) from %u to %u", 281 (unsigned)avail, (unsigned)total+10); 282 } 283#else 284 (void)cfg; 285#endif /* HAVE_GETRLIMIT */ 286} 287 288/** set verbosity, check rlimits, cache settings */ 289static void 290apply_settings(struct daemon* daemon, struct config_file* cfg, 291 int cmdline_verbose) 292{ 293 /* apply if they have changed */ 294 verbosity = cmdline_verbose + cfg->verbosity; 295 daemon_apply_cfg(daemon, cfg); 296 checkrlimits(cfg); 297} 298 299#ifdef HAVE_KILL 300/** Read existing pid from pidfile. 301 * @param file: file name of pid file. 302 * @return: the pid from the file or -1 if none. 303 */ 304static pid_t 305readpid (const char* file) 306{ 307 int fd; 308 pid_t pid; 309 char pidbuf[32]; 310 char* t; 311 ssize_t l; 312 313 if ((fd = open(file, O_RDONLY)) == -1) { 314 if(errno != ENOENT) 315 log_err("Could not read pidfile %s: %s", 316 file, strerror(errno)); 317 return -1; 318 } 319 320 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 321 if(errno != ENOENT) 322 log_err("Could not read pidfile %s: %s", 323 file, strerror(errno)); 324 close(fd); 325 return -1; 326 } 327 328 close(fd); 329 330 /* Empty pidfile means no pidfile... */ 331 if (l == 0) { 332 return -1; 333 } 334 335 pidbuf[sizeof(pidbuf)-1] = 0; 336 pid = (pid_t)strtol(pidbuf, &t, 10); 337 338 if (*t && *t != '\n') { 339 return -1; 340 } 341 return pid; 342} 343 344/** write pid to file. 345 * @param pidfile: file name of pid file. 346 * @param pid: pid to write to file. 347 */ 348static void 349writepid (const char* pidfile, pid_t pid) 350{ 351 FILE* f; 352 353 if ((f = fopen(pidfile, "w")) == NULL ) { 354 log_err("cannot open pidfile %s: %s", 355 pidfile, strerror(errno)); 356 return; 357 } 358 if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 359 log_err("cannot write to pidfile %s: %s", 360 pidfile, strerror(errno)); 361 } 362 fclose(f); 363} 364 365/** 366 * check old pid file. 367 * @param pidfile: the file name of the pid file. 368 * @param inchroot: if pidfile is inchroot and we can thus expect to 369 * be able to delete it. 370 */ 371static void 372checkoldpid(char* pidfile, int inchroot) 373{ 374 pid_t old; 375 if((old = readpid(pidfile)) != -1) { 376 /* see if it is still alive */ 377 if(kill(old, 0) == 0 || errno == EPERM) 378 log_warn("unbound is already running as pid %u.", 379 (unsigned)old); 380 else if(inchroot) 381 log_warn("did not exit gracefully last time (%u)", 382 (unsigned)old); 383 } 384} 385#endif /* HAVE_KILL */ 386 387/** detach from command line */ 388static void 389detach(void) 390{ 391#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 392 /* use POSIX daemon(3) function */ 393 if(daemon(1, 0) != 0) 394 fatal_exit("daemon failed: %s", strerror(errno)); 395#else /* no HAVE_DAEMON */ 396#ifdef HAVE_FORK 397 int fd; 398 /* Take off... */ 399 switch (fork()) { 400 case 0: 401 break; 402 case -1: 403 fatal_exit("fork failed: %s", strerror(errno)); 404 default: 405 /* exit interactive session */ 406 exit(0); 407 } 408 /* detach */ 409#ifdef HAVE_SETSID 410 if(setsid() == -1) 411 fatal_exit("setsid() failed: %s", strerror(errno)); 412#endif 413 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 414 (void)dup2(fd, STDIN_FILENO); 415 (void)dup2(fd, STDOUT_FILENO); 416 (void)dup2(fd, STDERR_FILENO); 417 if (fd > 2) 418 (void)close(fd); 419 } 420#endif /* HAVE_FORK */ 421#endif /* HAVE_DAEMON */ 422} 423 424/** daemonize, drop user priviliges and chroot if needed */ 425static void 426perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 427 const char** cfgfile) 428{ 429#ifdef HAVE_GETPWNAM 430 struct passwd *pwd = NULL; 431 uid_t uid; 432 gid_t gid; 433 /* initialize, but not to 0 (root) */ 434 memset(&uid, 112, sizeof(uid)); 435 memset(&gid, 112, sizeof(gid)); 436 log_assert(cfg); 437 438 if(cfg->username && cfg->username[0]) { 439 if((pwd = getpwnam(cfg->username)) == NULL) 440 fatal_exit("user '%s' does not exist.", cfg->username); 441 uid = pwd->pw_uid; 442 gid = pwd->pw_gid; 443 /* endpwent below, in case we need pwd for setusercontext */ 444 } 445#endif 446 447 /* init syslog (as root) if needed, before daemonize, otherwise 448 * a fork error could not be printed since daemonize closed stderr.*/ 449 if(cfg->use_syslog) { 450 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 451 } 452 /* if using a logfile, we cannot open it because the logfile would 453 * be created with the wrong permissions, we cannot chown it because 454 * we cannot chown system logfiles, so we do not open at all. 455 * So, using a logfile, the user does not see errors unless -d is 456 * given to unbound on the commandline. */ 457 458 /* read ssl keys while superuser and outside chroot */ 459#ifdef HAVE_SSL 460 if(!(daemon->rc = daemon_remote_create(cfg))) 461 fatal_exit("could not set up remote-control"); 462 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 463 if(!(daemon->listen_sslctx = listen_sslctx_create( 464 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 465 fatal_exit("could not set up listen SSL_CTX"); 466 } 467 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 468 fatal_exit("could not set up connect SSL_CTX"); 469#endif 470 471#ifdef HAVE_KILL 472 /* check old pid file before forking */ 473 if(cfg->pidfile && cfg->pidfile[0]) { 474 /* calculate position of pidfile */ 475 if(cfg->pidfile[0] == '/') 476 daemon->pidfile = strdup(cfg->pidfile); 477 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 478 cfg, 1); 479 if(!daemon->pidfile) 480 fatal_exit("pidfile alloc: out of memory"); 481 checkoldpid(daemon->pidfile, 482 /* true if pidfile is inside chrootdir, or nochroot */ 483 !(cfg->chrootdir && cfg->chrootdir[0]) || 484 (cfg->chrootdir && cfg->chrootdir[0] && 485 strncmp(daemon->pidfile, cfg->chrootdir, 486 strlen(cfg->chrootdir))==0)); 487 } 488#endif 489 490 /* daemonize because pid is needed by the writepid func */ 491 if(!debug_mode && cfg->do_daemonize) { 492 detach(); 493 } 494 495 /* write new pidfile (while still root, so can be outside chroot) */ 496#ifdef HAVE_KILL 497 if(cfg->pidfile && cfg->pidfile[0]) { 498 writepid(daemon->pidfile, getpid()); 499 if(!(cfg->chrootdir && cfg->chrootdir[0]) || 500 (cfg->chrootdir && cfg->chrootdir[0] && 501 strncmp(daemon->pidfile, cfg->chrootdir, 502 strlen(cfg->chrootdir))==0)) { 503 /* delete of pidfile could potentially work, 504 * chown to get permissions */ 505 if(cfg->username && cfg->username[0]) { 506 if(chown(daemon->pidfile, uid, gid) == -1) { 507 log_err("cannot chown %u.%u %s: %s", 508 (unsigned)uid, (unsigned)gid, 509 daemon->pidfile, strerror(errno)); 510 } 511 } 512 } 513 } 514#else 515 (void)daemon; 516#endif 517 518 /* Set user context */ 519#ifdef HAVE_GETPWNAM 520 if(cfg->username && cfg->username[0]) { 521#ifdef HAVE_SETUSERCONTEXT 522 /* setusercontext does initgroups, setuid, setgid, and 523 * also resource limits from login config, but we 524 * still call setresuid, setresgid to be sure to set all uid*/ 525 if(setusercontext(NULL, pwd, uid, 526 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 527 log_warn("unable to setusercontext %s: %s", 528 cfg->username, strerror(errno)); 529#endif /* HAVE_SETUSERCONTEXT */ 530 } 531#endif /* HAVE_GETPWNAM */ 532 533 /* box into the chroot */ 534#ifdef HAVE_CHROOT 535 if(cfg->chrootdir && cfg->chrootdir[0]) { 536 if(chdir(cfg->chrootdir)) { 537 fatal_exit("unable to chdir to chroot %s: %s", 538 cfg->chrootdir, strerror(errno)); 539 } 540 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 541 if(chroot(cfg->chrootdir)) 542 fatal_exit("unable to chroot to %s: %s", 543 cfg->chrootdir, strerror(errno)); 544 if(chdir("/")) 545 fatal_exit("unable to chdir to / in chroot %s: %s", 546 cfg->chrootdir, strerror(errno)); 547 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 548 if(strncmp(*cfgfile, cfg->chrootdir, 549 strlen(cfg->chrootdir)) == 0) 550 (*cfgfile) += strlen(cfg->chrootdir); 551 552 /* adjust stored pidfile for chroot */ 553 if(daemon->pidfile && daemon->pidfile[0] && 554 strncmp(daemon->pidfile, cfg->chrootdir, 555 strlen(cfg->chrootdir))==0) { 556 char* old = daemon->pidfile; 557 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 558 free(old); 559 if(!daemon->pidfile) 560 log_err("out of memory in pidfile adjust"); 561 } 562 daemon->chroot = strdup(cfg->chrootdir); 563 if(!daemon->chroot) 564 log_err("out of memory in daemon chroot dir storage"); 565 } 566#else 567 (void)cfgfile; 568#endif 569 /* change to working directory inside chroot */ 570 if(cfg->directory && cfg->directory[0]) { 571 char* dir = cfg->directory; 572 if(cfg->chrootdir && cfg->chrootdir[0] && 573 strncmp(dir, cfg->chrootdir, 574 strlen(cfg->chrootdir)) == 0) 575 dir += strlen(cfg->chrootdir); 576 if(dir[0]) { 577 if(chdir(dir)) { 578 fatal_exit("Could not chdir to %s: %s", 579 dir, strerror(errno)); 580 } 581 verbose(VERB_QUERY, "chdir to %s", dir); 582 } 583 } 584 585 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 586#ifdef HAVE_GETPWNAM 587 if(cfg->username && cfg->username[0]) { 588# ifdef HAVE_INITGROUPS 589 if(initgroups(cfg->username, gid) != 0) 590 log_warn("unable to initgroups %s: %s", 591 cfg->username, strerror(errno)); 592# endif /* HAVE_INITGROUPS */ 593 endpwent(); 594 595#ifdef HAVE_SETRESGID 596 if(setresgid(gid,gid,gid) != 0) 597#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 598 if(setregid(gid,gid) != 0) 599#else /* use setgid */ 600 if(setgid(gid) != 0) 601#endif /* HAVE_SETRESGID */ 602 fatal_exit("unable to set group id of %s: %s", 603 cfg->username, strerror(errno)); 604#ifdef HAVE_SETRESUID 605 if(setresuid(uid,uid,uid) != 0) 606#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 607 if(setreuid(uid,uid) != 0) 608#else /* use setuid */ 609 if(setuid(uid) != 0) 610#endif /* HAVE_SETRESUID */ 611 fatal_exit("unable to set user id of %s: %s", 612 cfg->username, strerror(errno)); 613 verbose(VERB_QUERY, "drop user privileges, run as %s", 614 cfg->username); 615 } 616#endif /* HAVE_GETPWNAM */ 617 /* file logging inited after chroot,chdir,setuid is done so that 618 * it would succeed on SIGHUP as well */ 619 if(!cfg->use_syslog) 620 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 621} 622 623/** 624 * Run the daemon. 625 * @param cfgfile: the config file name. 626 * @param cmdline_verbose: verbosity resulting from commandline -v. 627 * These increase verbosity as specified in the config file. 628 * @param debug_mode: if set, do not daemonize. 629 */ 630static void 631run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 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 cfgfile); 651 log_warn("Continuing with default config settings"); 652 } 653 apply_settings(daemon, cfg, cmdline_verbose); 654 655 /* prepare */ 656 if(!daemon_open_shared_ports(daemon)) 657 fatal_exit("could not open ports"); 658 if(!done_setup) { 659 perform_setup(daemon, cfg, debug_mode, &cfgfile); 660 done_setup = 1; 661 } else { 662 /* reopen log after HUP to facilitate log rotation */ 663 if(!cfg->use_syslog) 664 log_init(cfg->logfile, 0, cfg->chrootdir); 665 } 666 /* work */ 667 daemon_fork(daemon); 668 669 /* clean up for restart */ 670 verbose(VERB_ALGO, "cleanup."); 671 daemon_cleanup(daemon); 672 config_delete(cfg); 673 } 674 verbose(VERB_ALGO, "Exit cleanup."); 675 /* this unlink may not work if the pidfile is located outside 676 * of the chroot/workdir or we no longer have permissions */ 677 if(daemon->pidfile) { 678 int fd; 679 /* truncate pidfile */ 680 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 681 if(fd != -1) 682 close(fd); 683 /* delete pidfile */ 684 unlink(daemon->pidfile); 685 } 686 daemon_delete(daemon); 687} 688 689/** getopt global, in case header files fail to declare it. */ 690extern int optind; 691/** getopt global, in case header files fail to declare it. */ 692extern char* optarg; 693 694/** 695 * main program. Set options given commandline arguments. 696 * @param argc: number of commandline arguments. 697 * @param argv: array of commandline arguments. 698 * @return: exit status of the program. 699 */ 700int 701main(int argc, char* argv[]) 702{ 703 int c; 704 const char* cfgfile = CONFIGFILE; 705 const char* winopt = NULL; 706 int cmdline_verbose = 0; 707 int debug_mode = 0; 708#ifdef UB_ON_WINDOWS 709 int cmdline_cfg = 0; 710#endif 711 712#ifdef HAVE_SBRK 713 /* take debug snapshot of heap */ 714 unbound_start_brk = sbrk(0); 715#endif 716 717 log_init(NULL, 0, NULL); 718 /* parse the options */ 719 while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 720 switch(c) { 721 case 'c': 722 cfgfile = optarg; 723#ifdef UB_ON_WINDOWS 724 cmdline_cfg = 1; 725#endif 726 break; 727 case 'v': 728 cmdline_verbose ++; 729 verbosity++; 730 break; 731 case 'd': 732 debug_mode = 1; 733 break; 734 case 'w': 735 winopt = optarg; 736 break; 737 case '?': 738 case 'h': 739 default: 740 usage(); 741 return 1; 742 } 743 } 744 argc -= optind; 745 argv += optind; 746 747 if(winopt) { 748#ifdef UB_ON_WINDOWS 749 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 750 cmdline_cfg); 751#else 752 fatal_exit("option not supported"); 753#endif 754 } 755 756 if(argc != 0) { 757 usage(); 758 return 1; 759 } 760 761 run_daemon(cfgfile, cmdline_verbose, debug_mode); 762 log_init(NULL, 0, NULL); /* close logfile */ 763 return 0; 764} 765