unbound.c revision 282089
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 <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#ifndef S_SPLINT_S 71/* splint chokes on this system header file */ 72#ifdef HAVE_SYS_RESOURCE_H 73#include <sys/resource.h> 74#endif 75#endif /* S_SPLINT_S */ 76#ifdef HAVE_LOGIN_CAP_H 77#include <login_cap.h> 78#endif 79 80#ifdef USE_MINI_EVENT 81# ifdef USE_WINSOCK 82# include "util/winsock_event.h" 83# else 84# include "util/mini_event.h" 85# endif 86#else 87# ifdef HAVE_EVENT_H 88# include <event.h> 89# else 90# include "event2/event.h" 91# include "event2/event_struct.h" 92# include "event2/event_compat.h" 93# endif 94#endif 95 96#ifdef UB_ON_WINDOWS 97# include "winrc/win_svc.h" 98#endif 99 100#ifdef HAVE_NSS 101/* nss3 */ 102# include "nss.h" 103#endif 104 105#ifdef HAVE_SBRK 106/** global debug value to keep track of heap memory allocation */ 107void* unbound_start_brk = 0; 108#endif 109 110#if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 111static const char* ev_backend2str(int b) 112{ 113 switch(b) { 114 case EVBACKEND_SELECT: return "select"; 115 case EVBACKEND_POLL: return "poll"; 116 case EVBACKEND_EPOLL: return "epoll"; 117 case EVBACKEND_KQUEUE: return "kqueue"; 118 case EVBACKEND_DEVPOLL: return "devpoll"; 119 case EVBACKEND_PORT: return "evport"; 120 } 121 return "unknown"; 122} 123#endif 124 125/** get the event system in use */ 126static void get_event_sys(const char** n, const char** s, const char** m) 127{ 128#ifdef USE_WINSOCK 129 *n = "event"; 130 *s = "winsock"; 131 *m = "WSAWaitForMultipleEvents"; 132#elif defined(USE_MINI_EVENT) 133 *n = "mini-event"; 134 *s = "internal"; 135 *m = "select"; 136#else 137 struct event_base* b; 138 *s = event_get_version(); 139# ifdef HAVE_EVENT_BASE_GET_METHOD 140 *n = "libevent"; 141 b = event_base_new(); 142 *m = event_base_get_method(b); 143# elif defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 144 *n = "libev"; 145 b = (struct event_base*)ev_default_loop(EVFLAG_AUTO); 146 *m = ev_backend2str(ev_backend((struct ev_loop*)b)); 147# else 148 *n = "unknown"; 149 *m = "not obtainable"; 150 b = NULL; 151# endif 152# ifdef HAVE_EVENT_BASE_FREE 153 event_base_free(b); 154# endif 155#endif 156} 157 158/** print usage. */ 159static void usage() 160{ 161 const char** m; 162 const char *evnm="event", *evsys="", *evmethod=""; 163 printf("usage: unbound [options]\n"); 164 printf(" start unbound daemon DNS resolver.\n"); 165 printf("-h this help\n"); 166 printf("-c file config file to read instead of %s\n", CONFIGFILE); 167 printf(" file format is described in unbound.conf(5).\n"); 168 printf("-d do not fork into the background.\n"); 169 printf("-v verbose (more times to increase verbosity)\n"); 170#ifdef UB_ON_WINDOWS 171 printf("-w opt windows option: \n"); 172 printf(" install, remove - manage the services entry\n"); 173 printf(" service - used to start from services control panel\n"); 174#endif 175 printf("Version %s\n", PACKAGE_VERSION); 176 get_event_sys(&evnm, &evsys, &evmethod); 177 printf("linked libs: %s %s (it uses %s), %s\n", 178 evnm, evsys, evmethod, 179#ifdef HAVE_SSL 180 SSLeay_version(SSLEAY_VERSION) 181#elif defined(HAVE_NSS) 182 NSS_GetVersion() 183#endif 184 ); 185 printf("linked modules:"); 186 for(m = module_list_avail(); *m; m++) 187 printf(" %s", *m); 188 printf("\n"); 189 printf("BSD licensed, see LICENSE in source package for details.\n"); 190 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 191} 192 193#ifndef unbound_testbound 194int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 195{ 196 log_assert(0); 197 return 0; 198} 199#endif 200 201/** check file descriptor count */ 202static void 203checkrlimits(struct config_file* cfg) 204{ 205#ifndef S_SPLINT_S 206#ifdef HAVE_GETRLIMIT 207 /* list has number of ports to listen to, ifs number addresses */ 208 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 209 (int)cfg->incoming_num_tcp:0)); 210 size_t listen_ifs = (size_t)(cfg->num_ifs==0? 211 ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 212 (cfg->do_ip6?1:0)):cfg->num_ifs); 213 size_t listen_num = list*listen_ifs; 214 size_t outudpnum = (size_t)cfg->outgoing_num_ports; 215 size_t outtcpnum = cfg->outgoing_num_tcp; 216 size_t misc = 4; /* logfile, pidfile, stdout... */ 217 size_t perthread_noudp = listen_num + outtcpnum + 218 2/*cmdpipe*/ + 2/*libevent*/ + misc; 219 size_t perthread = perthread_noudp + outudpnum; 220 221#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 222 int numthread = 1; /* it forks */ 223#else 224 int numthread = (cfg->num_threads?cfg->num_threads:1); 225#endif 226 size_t total = numthread * perthread + misc; 227 size_t avail; 228 struct rlimit rlim; 229 230 if(total > 1024 && 231 strncmp(event_get_version(), "mini-event", 10) == 0) { 232 log_warn("too many file descriptors requested. The builtin" 233 "mini-event cannot handle more than 1024. Config " 234 "for less fds or compile with libevent"); 235 if(numthread*perthread_noudp+15 > 1024) 236 fatal_exit("too much tcp. not enough fds."); 237 cfg->outgoing_num_ports = (int)((1024 238 - numthread*perthread_noudp 239 - 10 /* safety margin */) /numthread); 240 log_warn("continuing with less udp ports: %u", 241 cfg->outgoing_num_ports); 242 total = 1024; 243 } 244 if(perthread > 64 && 245 strncmp(event_get_version(), "winsock-event", 13) == 0) { 246 log_err("too many file descriptors requested. The winsock" 247 " event handler cannot handle more than 64 per " 248 " thread. Config for less fds"); 249 if(perthread_noudp+2 > 64) 250 fatal_exit("too much tcp. not enough fds."); 251 cfg->outgoing_num_ports = (int)((64 252 - perthread_noudp 253 - 2/* safety margin */)); 254 log_warn("continuing with less udp ports: %u", 255 cfg->outgoing_num_ports); 256 total = numthread*(perthread_noudp+ 257 (size_t)cfg->outgoing_num_ports)+misc; 258 } 259 if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 260 log_warn("getrlimit: %s", strerror(errno)); 261 return; 262 } 263 if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 264 return; 265 if((size_t)rlim.rlim_cur < total) { 266 avail = (size_t)rlim.rlim_cur; 267 rlim.rlim_cur = (rlim_t)(total + 10); 268 rlim.rlim_max = (rlim_t)(total + 10); 269#ifdef HAVE_SETRLIMIT 270 if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 271 log_warn("setrlimit: %s", strerror(errno)); 272#endif 273 log_warn("cannot increase max open fds from %u to %u", 274 (unsigned)avail, (unsigned)total+10); 275 /* check that calculation below does not underflow, 276 * with 15 as margin */ 277 if(numthread*perthread_noudp+15 > avail) 278 fatal_exit("too much tcp. not enough fds."); 279 cfg->outgoing_num_ports = (int)((avail 280 - numthread*perthread_noudp 281 - 10 /* safety margin */) /numthread); 282 log_warn("continuing with less udp ports: %u", 283 cfg->outgoing_num_ports); 284 log_warn("increase ulimit or decrease threads, " 285 "ports in config to remove this warning"); 286 return; 287#ifdef HAVE_SETRLIMIT 288 } 289#endif 290 verbose(VERB_ALGO, "increased limit(open files) from %u to %u", 291 (unsigned)avail, (unsigned)total+10); 292 } 293#else 294 (void)cfg; 295#endif /* HAVE_GETRLIMIT */ 296#endif /* S_SPLINT_S */ 297} 298 299/** set verbosity, check rlimits, cache settings */ 300static void 301apply_settings(struct daemon* daemon, struct config_file* cfg, 302 int cmdline_verbose, int debug_mode) 303{ 304 /* apply if they have changed */ 305 verbosity = cmdline_verbose + cfg->verbosity; 306 if (debug_mode > 1) { 307 cfg->use_syslog = 0; 308 cfg->logfile = NULL; 309 } 310 daemon_apply_cfg(daemon, cfg); 311 checkrlimits(cfg); 312} 313 314#ifdef HAVE_KILL 315/** Read existing pid from pidfile. 316 * @param file: file name of pid file. 317 * @return: the pid from the file or -1 if none. 318 */ 319static pid_t 320readpid (const char* file) 321{ 322 int fd; 323 pid_t pid; 324 char pidbuf[32]; 325 char* t; 326 ssize_t l; 327 328 if ((fd = open(file, O_RDONLY)) == -1) { 329 if(errno != ENOENT) 330 log_err("Could not read pidfile %s: %s", 331 file, strerror(errno)); 332 return -1; 333 } 334 335 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 336 if(errno != ENOENT) 337 log_err("Could not read pidfile %s: %s", 338 file, strerror(errno)); 339 close(fd); 340 return -1; 341 } 342 343 close(fd); 344 345 /* Empty pidfile means no pidfile... */ 346 if (l == 0) { 347 return -1; 348 } 349 350 pidbuf[sizeof(pidbuf)-1] = 0; 351 pid = (pid_t)strtol(pidbuf, &t, 10); 352 353 if (*t && *t != '\n') { 354 return -1; 355 } 356 return pid; 357} 358 359/** write pid to file. 360 * @param pidfile: file name of pid file. 361 * @param pid: pid to write to file. 362 */ 363static void 364writepid (const char* pidfile, pid_t pid) 365{ 366 FILE* f; 367 368 if ((f = fopen(pidfile, "w")) == NULL ) { 369 log_err("cannot open pidfile %s: %s", 370 pidfile, strerror(errno)); 371 return; 372 } 373 if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 374 log_err("cannot write to pidfile %s: %s", 375 pidfile, strerror(errno)); 376 } 377 fclose(f); 378} 379 380/** 381 * check old pid file. 382 * @param pidfile: the file name of the pid file. 383 * @param inchroot: if pidfile is inchroot and we can thus expect to 384 * be able to delete it. 385 */ 386static void 387checkoldpid(char* pidfile, int inchroot) 388{ 389 pid_t old; 390 if((old = readpid(pidfile)) != -1) { 391 /* see if it is still alive */ 392 if(kill(old, 0) == 0 || errno == EPERM) 393 log_warn("unbound is already running as pid %u.", 394 (unsigned)old); 395 else if(inchroot) 396 log_warn("did not exit gracefully last time (%u)", 397 (unsigned)old); 398 } 399} 400#endif /* HAVE_KILL */ 401 402/** detach from command line */ 403static void 404detach(void) 405{ 406#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 407 /* use POSIX daemon(3) function */ 408 if(daemon(1, 0) != 0) 409 fatal_exit("daemon failed: %s", strerror(errno)); 410#else /* no HAVE_DAEMON */ 411#ifdef HAVE_FORK 412 int fd; 413 /* Take off... */ 414 switch (fork()) { 415 case 0: 416 break; 417 case -1: 418 fatal_exit("fork failed: %s", strerror(errno)); 419 default: 420 /* exit interactive session */ 421 exit(0); 422 } 423 /* detach */ 424#ifdef HAVE_SETSID 425 if(setsid() == -1) 426 fatal_exit("setsid() failed: %s", strerror(errno)); 427#endif 428 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 429 (void)dup2(fd, STDIN_FILENO); 430 (void)dup2(fd, STDOUT_FILENO); 431 (void)dup2(fd, STDERR_FILENO); 432 if (fd > 2) 433 (void)close(fd); 434 } 435#endif /* HAVE_FORK */ 436#endif /* HAVE_DAEMON */ 437} 438 439/** daemonize, drop user priviliges and chroot if needed */ 440static void 441perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 442 const char** cfgfile) 443{ 444#ifdef HAVE_GETPWNAM 445 struct passwd *pwd = NULL; 446 447 if(cfg->username && cfg->username[0]) { 448 if((pwd = getpwnam(cfg->username)) == NULL) 449 fatal_exit("user '%s' does not exist.", cfg->username); 450 /* endpwent below, in case we need pwd for setusercontext */ 451 } 452#endif 453 454 /* init syslog (as root) if needed, before daemonize, otherwise 455 * a fork error could not be printed since daemonize closed stderr.*/ 456 if(cfg->use_syslog) { 457 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 458 } 459 /* if using a logfile, we cannot open it because the logfile would 460 * be created with the wrong permissions, we cannot chown it because 461 * we cannot chown system logfiles, so we do not open at all. 462 * So, using a logfile, the user does not see errors unless -d is 463 * given to unbound on the commandline. */ 464 465 /* read ssl keys while superuser and outside chroot */ 466#ifdef HAVE_SSL 467 if(!(daemon->rc = daemon_remote_create(cfg))) 468 fatal_exit("could not set up remote-control"); 469 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 470 if(!(daemon->listen_sslctx = listen_sslctx_create( 471 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 472 fatal_exit("could not set up listen SSL_CTX"); 473 } 474 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 475 fatal_exit("could not set up connect SSL_CTX"); 476#endif 477 478#ifdef HAVE_KILL 479 /* check old pid file before forking */ 480 if(cfg->pidfile && cfg->pidfile[0]) { 481 /* calculate position of pidfile */ 482 if(cfg->pidfile[0] == '/') 483 daemon->pidfile = strdup(cfg->pidfile); 484 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 485 cfg, 1); 486 if(!daemon->pidfile) 487 fatal_exit("pidfile alloc: out of memory"); 488 checkoldpid(daemon->pidfile, 489 /* true if pidfile is inside chrootdir, or nochroot */ 490 !(cfg->chrootdir && cfg->chrootdir[0]) || 491 (cfg->chrootdir && cfg->chrootdir[0] && 492 strncmp(daemon->pidfile, cfg->chrootdir, 493 strlen(cfg->chrootdir))==0)); 494 } 495#endif 496 497 /* daemonize because pid is needed by the writepid func */ 498 if(!debug_mode && cfg->do_daemonize) { 499 detach(); 500 } 501 502 /* write new pidfile (while still root, so can be outside chroot) */ 503#ifdef HAVE_KILL 504 if(cfg->pidfile && cfg->pidfile[0]) { 505 writepid(daemon->pidfile, getpid()); 506 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 507# ifdef HAVE_CHOWN 508 if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) { 509 log_err("cannot chown %u.%u %s: %s", 510 (unsigned)cfg_uid, (unsigned)cfg_gid, 511 daemon->pidfile, strerror(errno)); 512 } 513# endif /* HAVE_CHOWN */ 514 } 515 } 516#else 517 (void)daemon; 518#endif /* HAVE_KILL */ 519 520 /* Set user context */ 521#ifdef HAVE_GETPWNAM 522 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 523#ifdef HAVE_SETUSERCONTEXT 524 /* setusercontext does initgroups, setuid, setgid, and 525 * also resource limits from login config, but we 526 * still call setresuid, setresgid to be sure to set all uid*/ 527 if(setusercontext(NULL, pwd, cfg_uid, (unsigned) 528 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 529 log_warn("unable to setusercontext %s: %s", 530 cfg->username, strerror(errno)); 531#endif /* HAVE_SETUSERCONTEXT */ 532 } 533#endif /* HAVE_GETPWNAM */ 534 535 /* box into the chroot */ 536#ifdef HAVE_CHROOT 537 if(cfg->chrootdir && cfg->chrootdir[0]) { 538 if(chdir(cfg->chrootdir)) { 539 fatal_exit("unable to chdir to chroot %s: %s", 540 cfg->chrootdir, strerror(errno)); 541 } 542 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 543 if(chroot(cfg->chrootdir)) 544 fatal_exit("unable to chroot to %s: %s", 545 cfg->chrootdir, strerror(errno)); 546 if(chdir("/")) 547 fatal_exit("unable to chdir to / in chroot %s: %s", 548 cfg->chrootdir, strerror(errno)); 549 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 550 if(strncmp(*cfgfile, cfg->chrootdir, 551 strlen(cfg->chrootdir)) == 0) 552 (*cfgfile) += strlen(cfg->chrootdir); 553 554 /* adjust stored pidfile for chroot */ 555 if(daemon->pidfile && daemon->pidfile[0] && 556 strncmp(daemon->pidfile, cfg->chrootdir, 557 strlen(cfg->chrootdir))==0) { 558 char* old = daemon->pidfile; 559 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 560 free(old); 561 if(!daemon->pidfile) 562 log_err("out of memory in pidfile adjust"); 563 } 564 daemon->chroot = strdup(cfg->chrootdir); 565 if(!daemon->chroot) 566 log_err("out of memory in daemon chroot dir storage"); 567 } 568#else 569 (void)cfgfile; 570#endif 571 /* change to working directory inside chroot */ 572 if(cfg->directory && cfg->directory[0]) { 573 char* dir = cfg->directory; 574 if(cfg->chrootdir && cfg->chrootdir[0] && 575 strncmp(dir, cfg->chrootdir, 576 strlen(cfg->chrootdir)) == 0) 577 dir += strlen(cfg->chrootdir); 578 if(dir[0]) { 579 if(chdir(dir)) { 580 fatal_exit("Could not chdir to %s: %s", 581 dir, strerror(errno)); 582 } 583 verbose(VERB_QUERY, "chdir to %s", dir); 584 } 585 } 586 587 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 588#ifdef HAVE_GETPWNAM 589 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 590# ifdef HAVE_INITGROUPS 591 if(initgroups(cfg->username, cfg_gid) != 0) 592 log_warn("unable to initgroups %s: %s", 593 cfg->username, strerror(errno)); 594# endif /* HAVE_INITGROUPS */ 595 endpwent(); 596 597#ifdef HAVE_SETRESGID 598 if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0) 599#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 600 if(setregid(cfg_gid,cfg_gid) != 0) 601#else /* use setgid */ 602 if(setgid(cfg_gid) != 0) 603#endif /* HAVE_SETRESGID */ 604 fatal_exit("unable to set group id of %s: %s", 605 cfg->username, strerror(errno)); 606#ifdef HAVE_SETRESUID 607 if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0) 608#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 609 if(setreuid(cfg_uid,cfg_uid) != 0) 610#else /* use setuid */ 611 if(setuid(cfg_uid) != 0) 612#endif /* HAVE_SETRESUID */ 613 fatal_exit("unable to set user id of %s: %s", 614 cfg->username, strerror(errno)); 615 verbose(VERB_QUERY, "drop user privileges, run as %s", 616 cfg->username); 617 } 618#endif /* HAVE_GETPWNAM */ 619 /* file logging inited after chroot,chdir,setuid is done so that 620 * it would succeed on SIGHUP as well */ 621 if(!cfg->use_syslog) 622 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 623} 624 625/** 626 * Run the daemon. 627 * @param cfgfile: the config file name. 628 * @param cmdline_verbose: verbosity resulting from commandline -v. 629 * These increase verbosity as specified in the config file. 630 * @param debug_mode: if set, do not daemonize. 631 */ 632static void 633run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 634{ 635 struct config_file* cfg = NULL; 636 struct daemon* daemon = NULL; 637 int done_setup = 0; 638 639 if(!(daemon = daemon_init())) 640 fatal_exit("alloc failure"); 641 while(!daemon->need_to_exit) { 642 if(done_setup) 643 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 644 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 645 646 /* config stuff */ 647 if(!(cfg = config_create())) 648 fatal_exit("Could not alloc config defaults"); 649 if(!config_read(cfg, cfgfile, daemon->chroot)) { 650 if(errno != ENOENT) 651 fatal_exit("Could not read config file: %s", 652 cfgfile); 653 log_warn("Continuing with default config settings"); 654 } 655 apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 656 if(!done_setup) 657 config_lookup_uid(cfg); 658 659 /* prepare */ 660 if(!daemon_open_shared_ports(daemon)) 661 fatal_exit("could not open ports"); 662 if(!done_setup) { 663 perform_setup(daemon, cfg, debug_mode, &cfgfile); 664 done_setup = 1; 665 } else { 666 /* reopen log after HUP to facilitate log rotation */ 667 if(!cfg->use_syslog) 668 log_init(cfg->logfile, 0, cfg->chrootdir); 669 } 670 /* work */ 671 daemon_fork(daemon); 672 673 /* clean up for restart */ 674 verbose(VERB_ALGO, "cleanup."); 675 daemon_cleanup(daemon); 676 config_delete(cfg); 677 } 678 verbose(VERB_ALGO, "Exit cleanup."); 679 /* this unlink may not work if the pidfile is located outside 680 * of the chroot/workdir or we no longer have permissions */ 681 if(daemon->pidfile) { 682 int fd; 683 /* truncate pidfile */ 684 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 685 if(fd != -1) 686 close(fd); 687 /* delete pidfile */ 688 unlink(daemon->pidfile); 689 } 690 daemon_delete(daemon); 691} 692 693/** getopt global, in case header files fail to declare it. */ 694extern int optind; 695/** getopt global, in case header files fail to declare it. */ 696extern char* optarg; 697 698/** 699 * main program. Set options given commandline arguments. 700 * @param argc: number of commandline arguments. 701 * @param argv: array of commandline arguments. 702 * @return: exit status of the program. 703 */ 704int 705main(int argc, char* argv[]) 706{ 707 int c; 708 const char* cfgfile = CONFIGFILE; 709 const char* winopt = NULL; 710 int cmdline_verbose = 0; 711 int debug_mode = 0; 712#ifdef UB_ON_WINDOWS 713 int cmdline_cfg = 0; 714#endif 715 716#ifdef HAVE_SBRK 717 /* take debug snapshot of heap */ 718 unbound_start_brk = sbrk(0); 719#endif 720 721 log_init(NULL, 0, NULL); 722 log_ident_set(strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]); 723 /* parse the options */ 724 while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 725 switch(c) { 726 case 'c': 727 cfgfile = optarg; 728#ifdef UB_ON_WINDOWS 729 cmdline_cfg = 1; 730#endif 731 break; 732 case 'v': 733 cmdline_verbose ++; 734 verbosity++; 735 break; 736 case 'd': 737 debug_mode++; 738 break; 739 case 'w': 740 winopt = optarg; 741 break; 742 case '?': 743 case 'h': 744 default: 745 usage(); 746 return 1; 747 } 748 } 749 argc -= optind; 750 argv += optind; 751 752 if(winopt) { 753#ifdef UB_ON_WINDOWS 754 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 755 cmdline_cfg); 756#else 757 fatal_exit("option not supported"); 758#endif 759 } 760 761 if(argc != 0) { 762 usage(); 763 return 1; 764 } 765 766 run_daemon(cfgfile, cmdline_verbose, debug_mode); 767 log_init(NULL, 0, NULL); /* close logfile */ 768 return 0; 769} 770