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