unbound.c revision 307729
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 */ 92void* unbound_start_brk = 0; 93#endif 94 95/** print usage. */ 96static void usage(void) 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# ifdef SSLEAY_VERSION 122 SSLeay_version(SSLEAY_VERSION) 123# else 124 OpenSSL_version(OPENSSL_VERSION) 125# endif 126#elif defined(HAVE_NSS) 127 NSS_GetVersion() 128#elif defined(HAVE_NETTLE) 129 "nettle" 130#endif 131 ); 132 printf("linked modules:"); 133 for(m = module_list_avail(); *m; m++) 134 printf(" %s", *m); 135 printf("\n"); 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 142int 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 */ 150static void 151checkrlimits(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 verbosity, check rlimits, cache settings */ 248static void 249apply_settings(struct daemon* daemon, struct config_file* cfg, 250 int cmdline_verbose, int debug_mode) 251{ 252 /* apply if they have changed */ 253 verbosity = cmdline_verbose + cfg->verbosity; 254 if (debug_mode > 1) { 255 cfg->use_syslog = 0; 256 cfg->logfile = NULL; 257 } 258 daemon_apply_cfg(daemon, cfg); 259 checkrlimits(cfg); 260} 261 262#ifdef HAVE_KILL 263/** Read existing pid from pidfile. 264 * @param file: file name of pid file. 265 * @return: the pid from the file or -1 if none. 266 */ 267static pid_t 268readpid (const char* file) 269{ 270 int fd; 271 pid_t pid; 272 char pidbuf[32]; 273 char* t; 274 ssize_t l; 275 276 if ((fd = open(file, O_RDONLY)) == -1) { 277 if(errno != ENOENT) 278 log_err("Could not read pidfile %s: %s", 279 file, strerror(errno)); 280 return -1; 281 } 282 283 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 284 if(errno != ENOENT) 285 log_err("Could not read pidfile %s: %s", 286 file, strerror(errno)); 287 close(fd); 288 return -1; 289 } 290 291 close(fd); 292 293 /* Empty pidfile means no pidfile... */ 294 if (l == 0) { 295 return -1; 296 } 297 298 pidbuf[sizeof(pidbuf)-1] = 0; 299 pid = (pid_t)strtol(pidbuf, &t, 10); 300 301 if (*t && *t != '\n') { 302 return -1; 303 } 304 return pid; 305} 306 307/** write pid to file. 308 * @param pidfile: file name of pid file. 309 * @param pid: pid to write to file. 310 */ 311static void 312writepid (const char* pidfile, pid_t pid) 313{ 314 FILE* f; 315 316 if ((f = fopen(pidfile, "w")) == NULL ) { 317 log_err("cannot open pidfile %s: %s", 318 pidfile, strerror(errno)); 319 return; 320 } 321 if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 322 log_err("cannot write to pidfile %s: %s", 323 pidfile, strerror(errno)); 324 } 325 fclose(f); 326} 327 328/** 329 * check old pid file. 330 * @param pidfile: the file name of the pid file. 331 * @param inchroot: if pidfile is inchroot and we can thus expect to 332 * be able to delete it. 333 */ 334static void 335checkoldpid(char* pidfile, int inchroot) 336{ 337 pid_t old; 338 if((old = readpid(pidfile)) != -1) { 339 /* see if it is still alive */ 340 if(kill(old, 0) == 0 || errno == EPERM) 341 log_warn("unbound is already running as pid %u.", 342 (unsigned)old); 343 else if(inchroot) 344 log_warn("did not exit gracefully last time (%u)", 345 (unsigned)old); 346 } 347} 348#endif /* HAVE_KILL */ 349 350/** detach from command line */ 351static void 352detach(void) 353{ 354#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 355 /* use POSIX daemon(3) function */ 356 if(daemon(1, 0) != 0) 357 fatal_exit("daemon failed: %s", strerror(errno)); 358#else /* no HAVE_DAEMON */ 359#ifdef HAVE_FORK 360 int fd; 361 /* Take off... */ 362 switch (fork()) { 363 case 0: 364 break; 365 case -1: 366 fatal_exit("fork failed: %s", strerror(errno)); 367 default: 368 /* exit interactive session */ 369 exit(0); 370 } 371 /* detach */ 372#ifdef HAVE_SETSID 373 if(setsid() == -1) 374 fatal_exit("setsid() failed: %s", strerror(errno)); 375#endif 376 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 377 (void)dup2(fd, STDIN_FILENO); 378 (void)dup2(fd, STDOUT_FILENO); 379 (void)dup2(fd, STDERR_FILENO); 380 if (fd > 2) 381 (void)close(fd); 382 } 383#endif /* HAVE_FORK */ 384#endif /* HAVE_DAEMON */ 385} 386 387/** daemonize, drop user priviliges and chroot if needed */ 388static void 389perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 390 const char** cfgfile) 391{ 392#ifdef HAVE_KILL 393 int pidinchroot; 394#endif 395#ifdef HAVE_GETPWNAM 396 struct passwd *pwd = NULL; 397 398 if(cfg->username && cfg->username[0]) { 399 if((pwd = getpwnam(cfg->username)) == NULL) 400 fatal_exit("user '%s' does not exist.", cfg->username); 401 /* endpwent below, in case we need pwd for setusercontext */ 402 } 403#endif 404#ifdef UB_ON_WINDOWS 405 w_config_adjust_directory(cfg); 406#endif 407 408 /* init syslog (as root) if needed, before daemonize, otherwise 409 * a fork error could not be printed since daemonize closed stderr.*/ 410 if(cfg->use_syslog) { 411 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 412 } 413 /* if using a logfile, we cannot open it because the logfile would 414 * be created with the wrong permissions, we cannot chown it because 415 * we cannot chown system logfiles, so we do not open at all. 416 * So, using a logfile, the user does not see errors unless -d is 417 * given to unbound on the commandline. */ 418 419 /* read ssl keys while superuser and outside chroot */ 420#ifdef HAVE_SSL 421 if(!(daemon->rc = daemon_remote_create(cfg))) 422 fatal_exit("could not set up remote-control"); 423 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 424 if(!(daemon->listen_sslctx = listen_sslctx_create( 425 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 426 fatal_exit("could not set up listen SSL_CTX"); 427 } 428 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 429 fatal_exit("could not set up connect SSL_CTX"); 430#endif 431 432#ifdef HAVE_KILL 433 /* true if pidfile is inside chrootdir, or nochroot */ 434 pidinchroot = !(cfg->chrootdir && cfg->chrootdir[0]) || 435 (cfg->chrootdir && cfg->chrootdir[0] && 436 strncmp(cfg->pidfile, cfg->chrootdir, 437 strlen(cfg->chrootdir))==0); 438 439 /* check old pid file before forking */ 440 if(cfg->pidfile && cfg->pidfile[0]) { 441 /* calculate position of pidfile */ 442 if(cfg->pidfile[0] == '/') 443 daemon->pidfile = strdup(cfg->pidfile); 444 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 445 cfg, 1); 446 if(!daemon->pidfile) 447 fatal_exit("pidfile alloc: out of memory"); 448 checkoldpid(daemon->pidfile, pidinchroot); 449 } 450#endif 451 452 /* daemonize because pid is needed by the writepid func */ 453 if(!debug_mode && cfg->do_daemonize) { 454 detach(); 455 } 456 457 /* write new pidfile (while still root, so can be outside chroot) */ 458#ifdef HAVE_KILL 459 if(cfg->pidfile && cfg->pidfile[0]) { 460 writepid(daemon->pidfile, getpid()); 461 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1 && 462 pidinchroot) { 463# ifdef HAVE_CHOWN 464 if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) { 465 verbose(VERB_QUERY, "cannot chown %u.%u %s: %s", 466 (unsigned)cfg_uid, (unsigned)cfg_gid, 467 daemon->pidfile, strerror(errno)); 468 } 469# endif /* HAVE_CHOWN */ 470 } 471 } 472#else 473 (void)daemon; 474#endif /* HAVE_KILL */ 475 476 /* Set user context */ 477#ifdef HAVE_GETPWNAM 478 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 479#ifdef HAVE_SETUSERCONTEXT 480 /* setusercontext does initgroups, setuid, setgid, and 481 * also resource limits from login config, but we 482 * still call setresuid, setresgid to be sure to set all uid*/ 483 if(setusercontext(NULL, pwd, cfg_uid, (unsigned) 484 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 485 log_warn("unable to setusercontext %s: %s", 486 cfg->username, strerror(errno)); 487#endif /* HAVE_SETUSERCONTEXT */ 488 } 489#endif /* HAVE_GETPWNAM */ 490 491 /* box into the chroot */ 492#ifdef HAVE_CHROOT 493 if(cfg->chrootdir && cfg->chrootdir[0]) { 494 if(chdir(cfg->chrootdir)) { 495 fatal_exit("unable to chdir to chroot %s: %s", 496 cfg->chrootdir, strerror(errno)); 497 } 498 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 499 if(chroot(cfg->chrootdir)) 500 fatal_exit("unable to chroot to %s: %s", 501 cfg->chrootdir, strerror(errno)); 502 if(chdir("/")) 503 fatal_exit("unable to chdir to / in chroot %s: %s", 504 cfg->chrootdir, strerror(errno)); 505 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 506 if(strncmp(*cfgfile, cfg->chrootdir, 507 strlen(cfg->chrootdir)) == 0) 508 (*cfgfile) += strlen(cfg->chrootdir); 509 510 /* adjust stored pidfile for chroot */ 511 if(daemon->pidfile && daemon->pidfile[0] && 512 strncmp(daemon->pidfile, cfg->chrootdir, 513 strlen(cfg->chrootdir))==0) { 514 char* old = daemon->pidfile; 515 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 516 free(old); 517 if(!daemon->pidfile) 518 log_err("out of memory in pidfile adjust"); 519 } 520 daemon->chroot = strdup(cfg->chrootdir); 521 if(!daemon->chroot) 522 log_err("out of memory in daemon chroot dir storage"); 523 } 524#else 525 (void)cfgfile; 526#endif 527 /* change to working directory inside chroot */ 528 if(cfg->directory && cfg->directory[0]) { 529 char* dir = cfg->directory; 530 if(cfg->chrootdir && cfg->chrootdir[0] && 531 strncmp(dir, cfg->chrootdir, 532 strlen(cfg->chrootdir)) == 0) 533 dir += strlen(cfg->chrootdir); 534 if(dir[0]) { 535 if(chdir(dir)) { 536 fatal_exit("Could not chdir to %s: %s", 537 dir, strerror(errno)); 538 } 539 verbose(VERB_QUERY, "chdir to %s", dir); 540 } 541 } 542 543 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 544#ifdef HAVE_GETPWNAM 545 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 546# ifdef HAVE_INITGROUPS 547 if(initgroups(cfg->username, cfg_gid) != 0) 548 log_warn("unable to initgroups %s: %s", 549 cfg->username, strerror(errno)); 550# endif /* HAVE_INITGROUPS */ 551# ifdef HAVE_ENDPWENT 552 endpwent(); 553# endif 554 555#ifdef HAVE_SETRESGID 556 if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0) 557#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 558 if(setregid(cfg_gid,cfg_gid) != 0) 559#else /* use setgid */ 560 if(setgid(cfg_gid) != 0) 561#endif /* HAVE_SETRESGID */ 562 fatal_exit("unable to set group id of %s: %s", 563 cfg->username, strerror(errno)); 564#ifdef HAVE_SETRESUID 565 if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0) 566#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 567 if(setreuid(cfg_uid,cfg_uid) != 0) 568#else /* use setuid */ 569 if(setuid(cfg_uid) != 0) 570#endif /* HAVE_SETRESUID */ 571 fatal_exit("unable to set user id of %s: %s", 572 cfg->username, strerror(errno)); 573 verbose(VERB_QUERY, "drop user privileges, run as %s", 574 cfg->username); 575 } 576#endif /* HAVE_GETPWNAM */ 577 /* file logging inited after chroot,chdir,setuid is done so that 578 * it would succeed on SIGHUP as well */ 579 if(!cfg->use_syslog) 580 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 581} 582 583/** 584 * Run the daemon. 585 * @param cfgfile: the config file name. 586 * @param cmdline_verbose: verbosity resulting from commandline -v. 587 * These increase verbosity as specified in the config file. 588 * @param debug_mode: if set, do not daemonize. 589 */ 590static void 591run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 592{ 593 struct config_file* cfg = NULL; 594 struct daemon* daemon = NULL; 595 int done_setup = 0; 596 597 if(!(daemon = daemon_init())) 598 fatal_exit("alloc failure"); 599 while(!daemon->need_to_exit) { 600 if(done_setup) 601 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 602 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 603 604 /* config stuff */ 605 if(!(cfg = config_create())) 606 fatal_exit("Could not alloc config defaults"); 607 if(!config_read(cfg, cfgfile, daemon->chroot)) { 608 if(errno != ENOENT) 609 fatal_exit("Could not read config file: %s", 610 cfgfile); 611 log_warn("Continuing with default config settings"); 612 } 613 apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 614 if(!done_setup) 615 config_lookup_uid(cfg); 616 617 /* prepare */ 618 if(!daemon_open_shared_ports(daemon)) 619 fatal_exit("could not open ports"); 620 if(!done_setup) { 621 perform_setup(daemon, cfg, debug_mode, &cfgfile); 622 done_setup = 1; 623 } else { 624 /* reopen log after HUP to facilitate log rotation */ 625 if(!cfg->use_syslog) 626 log_init(cfg->logfile, 0, cfg->chrootdir); 627 } 628 /* work */ 629 daemon_fork(daemon); 630 631 /* clean up for restart */ 632 verbose(VERB_ALGO, "cleanup."); 633 daemon_cleanup(daemon); 634 config_delete(cfg); 635 } 636 verbose(VERB_ALGO, "Exit cleanup."); 637 /* this unlink may not work if the pidfile is located outside 638 * of the chroot/workdir or we no longer have permissions */ 639 if(daemon->pidfile) { 640 int fd; 641 /* truncate pidfile */ 642 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 643 if(fd != -1) 644 close(fd); 645 /* delete pidfile */ 646 unlink(daemon->pidfile); 647 } 648 daemon_delete(daemon); 649} 650 651/** getopt global, in case header files fail to declare it. */ 652extern int optind; 653/** getopt global, in case header files fail to declare it. */ 654extern char* optarg; 655 656/** 657 * main program. Set options given commandline arguments. 658 * @param argc: number of commandline arguments. 659 * @param argv: array of commandline arguments. 660 * @return: exit status of the program. 661 */ 662int 663main(int argc, char* argv[]) 664{ 665 int c; 666 const char* cfgfile = CONFIGFILE; 667 const char* winopt = NULL; 668 int cmdline_verbose = 0; 669 int debug_mode = 0; 670#ifdef UB_ON_WINDOWS 671 int cmdline_cfg = 0; 672#endif 673 674#ifdef HAVE_SBRK 675 /* take debug snapshot of heap */ 676 unbound_start_brk = sbrk(0); 677#endif 678 679 log_init(NULL, 0, NULL); 680 log_ident_set(strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]); 681 /* parse the options */ 682 while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 683 switch(c) { 684 case 'c': 685 cfgfile = optarg; 686#ifdef UB_ON_WINDOWS 687 cmdline_cfg = 1; 688#endif 689 break; 690 case 'v': 691 cmdline_verbose++; 692 verbosity++; 693 break; 694 case 'd': 695 debug_mode++; 696 break; 697 case 'w': 698 winopt = optarg; 699 break; 700 case '?': 701 case 'h': 702 default: 703 usage(); 704 return 1; 705 } 706 } 707 argc -= optind; 708 argv += optind; 709 710 if(winopt) { 711#ifdef UB_ON_WINDOWS 712 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 713 cmdline_cfg); 714#else 715 fatal_exit("option not supported"); 716#endif 717 } 718 719 if(argc != 0) { 720 usage(); 721 return 1; 722 } 723 724 run_daemon(cfgfile, cmdline_verbose, debug_mode); 725 log_init(NULL, 0, NULL); /* close logfile */ 726 return 0; 727} 728