unbound.c revision 269257
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# include <event.h> 88#endif 89 90#ifdef UB_ON_WINDOWS 91# include "winrc/win_svc.h" 92#endif 93 94#ifdef HAVE_NSS 95/* nss3 */ 96# include "nss.h" 97#endif 98 99#ifdef HAVE_SBRK 100/** global debug value to keep track of heap memory allocation */ 101void* unbound_start_brk = 0; 102#endif 103 104#if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 105static const char* ev_backend2str(int b) 106{ 107 switch(b) { 108 case EVBACKEND_SELECT: return "select"; 109 case EVBACKEND_POLL: return "poll"; 110 case EVBACKEND_EPOLL: return "epoll"; 111 case EVBACKEND_KQUEUE: return "kqueue"; 112 case EVBACKEND_DEVPOLL: return "devpoll"; 113 case EVBACKEND_PORT: return "evport"; 114 } 115 return "unknown"; 116} 117#endif 118 119/** get the event system in use */ 120static void get_event_sys(const char** n, const char** s, const char** m) 121{ 122#ifdef USE_WINSOCK 123 *n = "event"; 124 *s = "winsock"; 125 *m = "WSAWaitForMultipleEvents"; 126#elif defined(USE_MINI_EVENT) 127 *n = "mini-event"; 128 *s = "internal"; 129 *m = "select"; 130#else 131 struct event_base* b; 132 *s = event_get_version(); 133# ifdef HAVE_EVENT_BASE_GET_METHOD 134 *n = "libevent"; 135 b = event_base_new(); 136 *m = event_base_get_method(b); 137# elif defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 138 *n = "libev"; 139 b = (struct event_base*)ev_default_loop(EVFLAG_AUTO); 140 *m = ev_backend2str(ev_backend((struct ev_loop*)b)); 141# else 142 *n = "unknown"; 143 *m = "not obtainable"; 144 b = NULL; 145# endif 146# ifdef HAVE_EVENT_BASE_FREE 147 event_base_free(b); 148# endif 149#endif 150} 151 152/** print usage. */ 153static void usage() 154{ 155 const char** m; 156 const char *evnm="event", *evsys="", *evmethod=""; 157 printf("usage: unbound [options]\n"); 158 printf(" start unbound daemon DNS resolver.\n"); 159 printf("-h this help\n"); 160 printf("-c file config file to read instead of %s\n", CONFIGFILE); 161 printf(" file format is described in unbound.conf(5).\n"); 162 printf("-d do not fork into the background.\n"); 163 printf("-v verbose (more times to increase verbosity)\n"); 164#ifdef UB_ON_WINDOWS 165 printf("-w opt windows option: \n"); 166 printf(" install, remove - manage the services entry\n"); 167 printf(" service - used to start from services control panel\n"); 168#endif 169 printf("Version %s\n", PACKAGE_VERSION); 170 get_event_sys(&evnm, &evsys, &evmethod); 171 printf("linked libs: %s %s (it uses %s), %s\n", 172 evnm, evsys, evmethod, 173#ifdef HAVE_SSL 174 SSLeay_version(SSLEAY_VERSION) 175#elif defined(HAVE_NSS) 176 NSS_GetVersion() 177#endif 178 ); 179 printf("linked modules:"); 180 for(m = module_list_avail(); *m; m++) 181 printf(" %s", *m); 182 printf("\n"); 183 printf("BSD licensed, see LICENSE in source package for details.\n"); 184 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 185} 186 187#ifndef unbound_testbound 188int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 189{ 190 log_assert(0); 191 return 0; 192} 193#endif 194 195/** check file descriptor count */ 196static void 197checkrlimits(struct config_file* cfg) 198{ 199#ifndef S_SPLINT_S 200#ifdef HAVE_GETRLIMIT 201 /* list has number of ports to listen to, ifs number addresses */ 202 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 203 (int)cfg->incoming_num_tcp:0)); 204 size_t listen_ifs = (size_t)(cfg->num_ifs==0? 205 ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 206 (cfg->do_ip6?1:0)):cfg->num_ifs); 207 size_t listen_num = list*listen_ifs; 208 size_t outudpnum = (size_t)cfg->outgoing_num_ports; 209 size_t outtcpnum = cfg->outgoing_num_tcp; 210 size_t misc = 4; /* logfile, pidfile, stdout... */ 211 size_t perthread_noudp = listen_num + outtcpnum + 212 2/*cmdpipe*/ + 2/*libevent*/ + misc; 213 size_t perthread = perthread_noudp + outudpnum; 214 215#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 216 int numthread = 1; /* it forks */ 217#else 218 int numthread = (cfg->num_threads?cfg->num_threads:1); 219#endif 220 size_t total = numthread * perthread + misc; 221 size_t avail; 222 struct rlimit rlim; 223 224 if(total > 1024 && 225 strncmp(event_get_version(), "mini-event", 10) == 0) { 226 log_warn("too many file descriptors requested. The builtin" 227 "mini-event cannot handle more than 1024. Config " 228 "for less fds or compile with libevent"); 229 if(numthread*perthread_noudp+15 > 1024) 230 fatal_exit("too much tcp. not enough fds."); 231 cfg->outgoing_num_ports = (int)((1024 232 - numthread*perthread_noudp 233 - 10 /* safety margin */) /numthread); 234 log_warn("continuing with less udp ports: %u", 235 cfg->outgoing_num_ports); 236 total = 1024; 237 } 238 if(perthread > 64 && 239 strncmp(event_get_version(), "winsock-event", 13) == 0) { 240 log_err("too many file descriptors requested. The winsock" 241 " event handler cannot handle more than 64 per " 242 " thread. Config for less fds"); 243 if(perthread_noudp+2 > 64) 244 fatal_exit("too much tcp. not enough fds."); 245 cfg->outgoing_num_ports = (int)((64 246 - perthread_noudp 247 - 2/* safety margin */)); 248 log_warn("continuing with less udp ports: %u", 249 cfg->outgoing_num_ports); 250 total = numthread*(perthread_noudp+ 251 (size_t)cfg->outgoing_num_ports)+misc; 252 } 253 if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 254 log_warn("getrlimit: %s", strerror(errno)); 255 return; 256 } 257 if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 258 return; 259 if((size_t)rlim.rlim_cur < total) { 260 avail = (size_t)rlim.rlim_cur; 261 rlim.rlim_cur = (rlim_t)(total + 10); 262 rlim.rlim_max = (rlim_t)(total + 10); 263#ifdef HAVE_SETRLIMIT 264 if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 265 log_warn("setrlimit: %s", strerror(errno)); 266#else 267 if(1) { 268#endif 269 log_warn("cannot increase max open fds from %u to %u", 270 (unsigned)avail, (unsigned)total+10); 271 /* check that calculation below does not underflow, 272 * with 15 as margin */ 273 if(numthread*perthread_noudp+15 > avail) 274 fatal_exit("too much tcp. not enough fds."); 275 cfg->outgoing_num_ports = (int)((avail 276 - numthread*perthread_noudp 277 - 10 /* safety margin */) /numthread); 278 log_warn("continuing with less udp ports: %u", 279 cfg->outgoing_num_ports); 280 log_warn("increase ulimit or decrease threads, " 281 "ports in config to remove this warning"); 282 return; 283 } 284 log_warn("increased limit(open files) from %u to %u", 285 (unsigned)avail, (unsigned)total+10); 286 } 287#else 288 (void)cfg; 289#endif /* HAVE_GETRLIMIT */ 290#endif /* S_SPLINT_S */ 291} 292 293/** set verbosity, check rlimits, cache settings */ 294static void 295apply_settings(struct daemon* daemon, struct config_file* cfg, 296 int cmdline_verbose) 297{ 298 /* apply if they have changed */ 299 verbosity = cmdline_verbose + cfg->verbosity; 300 daemon_apply_cfg(daemon, cfg); 301 checkrlimits(cfg); 302} 303 304#ifdef HAVE_KILL 305/** Read existing pid from pidfile. 306 * @param file: file name of pid file. 307 * @return: the pid from the file or -1 if none. 308 */ 309static pid_t 310readpid (const char* file) 311{ 312 int fd; 313 pid_t pid; 314 char pidbuf[32]; 315 char* t; 316 ssize_t l; 317 318 if ((fd = open(file, O_RDONLY)) == -1) { 319 if(errno != ENOENT) 320 log_err("Could not read pidfile %s: %s", 321 file, strerror(errno)); 322 return -1; 323 } 324 325 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 326 if(errno != ENOENT) 327 log_err("Could not read pidfile %s: %s", 328 file, strerror(errno)); 329 close(fd); 330 return -1; 331 } 332 333 close(fd); 334 335 /* Empty pidfile means no pidfile... */ 336 if (l == 0) { 337 return -1; 338 } 339 340 pidbuf[sizeof(pidbuf)-1] = 0; 341 pid = (pid_t)strtol(pidbuf, &t, 10); 342 343 if (*t && *t != '\n') { 344 return -1; 345 } 346 return pid; 347} 348 349/** write pid to file. 350 * @param pidfile: file name of pid file. 351 * @param pid: pid to write to file. 352 */ 353static void 354writepid (const char* pidfile, pid_t pid) 355{ 356 FILE* f; 357 358 if ((f = fopen(pidfile, "w")) == NULL ) { 359 log_err("cannot open pidfile %s: %s", 360 pidfile, strerror(errno)); 361 return; 362 } 363 if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 364 log_err("cannot write to pidfile %s: %s", 365 pidfile, strerror(errno)); 366 } 367 fclose(f); 368} 369 370/** 371 * check old pid file. 372 * @param pidfile: the file name of the pid file. 373 * @param inchroot: if pidfile is inchroot and we can thus expect to 374 * be able to delete it. 375 */ 376static void 377checkoldpid(char* pidfile, int inchroot) 378{ 379 pid_t old; 380 if((old = readpid(pidfile)) != -1) { 381 /* see if it is still alive */ 382 if(kill(old, 0) == 0 || errno == EPERM) 383 log_warn("unbound is already running as pid %u.", 384 (unsigned)old); 385 else if(inchroot) 386 log_warn("did not exit gracefully last time (%u)", 387 (unsigned)old); 388 } 389} 390#endif /* HAVE_KILL */ 391 392/** detach from command line */ 393static void 394detach(void) 395{ 396#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 397 /* use POSIX daemon(3) function */ 398 if(daemon(1, 0) != 0) 399 fatal_exit("daemon failed: %s", strerror(errno)); 400#else /* no HAVE_DAEMON */ 401#ifdef HAVE_FORK 402 int fd; 403 /* Take off... */ 404 switch (fork()) { 405 case 0: 406 break; 407 case -1: 408 fatal_exit("fork failed: %s", strerror(errno)); 409 default: 410 /* exit interactive session */ 411 exit(0); 412 } 413 /* detach */ 414#ifdef HAVE_SETSID 415 if(setsid() == -1) 416 fatal_exit("setsid() failed: %s", strerror(errno)); 417#endif 418 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 419 (void)dup2(fd, STDIN_FILENO); 420 (void)dup2(fd, STDOUT_FILENO); 421 (void)dup2(fd, STDERR_FILENO); 422 if (fd > 2) 423 (void)close(fd); 424 } 425#endif /* HAVE_FORK */ 426#endif /* HAVE_DAEMON */ 427} 428 429/** daemonize, drop user priviliges and chroot if needed */ 430static void 431perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 432 const char** cfgfile) 433{ 434#ifdef HAVE_GETPWNAM 435 struct passwd *pwd = NULL; 436 uid_t uid; 437 gid_t gid; 438 /* initialize, but not to 0 (root) */ 439 memset(&uid, 112, sizeof(uid)); 440 memset(&gid, 112, sizeof(gid)); 441 log_assert(cfg); 442 443 if(cfg->username && cfg->username[0]) { 444 if((pwd = getpwnam(cfg->username)) == NULL) 445 fatal_exit("user '%s' does not exist.", cfg->username); 446 uid = pwd->pw_uid; 447 gid = pwd->pw_gid; 448 /* endpwent below, in case we need pwd for setusercontext */ 449 } 450#endif 451 452 /* init syslog (as root) if needed, before daemonize, otherwise 453 * a fork error could not be printed since daemonize closed stderr.*/ 454 if(cfg->use_syslog) { 455 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 456 } 457 /* if using a logfile, we cannot open it because the logfile would 458 * be created with the wrong permissions, we cannot chown it because 459 * we cannot chown system logfiles, so we do not open at all. 460 * So, using a logfile, the user does not see errors unless -d is 461 * given to unbound on the commandline. */ 462 463 /* read ssl keys while superuser and outside chroot */ 464#ifdef HAVE_SSL 465 if(!(daemon->rc = daemon_remote_create(cfg))) 466 fatal_exit("could not set up remote-control"); 467 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 468 if(!(daemon->listen_sslctx = listen_sslctx_create( 469 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 470 fatal_exit("could not set up listen SSL_CTX"); 471 } 472 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 473 fatal_exit("could not set up connect SSL_CTX"); 474#endif 475 476#ifdef HAVE_KILL 477 /* check old pid file before forking */ 478 if(cfg->pidfile && cfg->pidfile[0]) { 479 /* calculate position of pidfile */ 480 if(cfg->pidfile[0] == '/') 481 daemon->pidfile = strdup(cfg->pidfile); 482 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 483 cfg, 1); 484 if(!daemon->pidfile) 485 fatal_exit("pidfile alloc: out of memory"); 486 checkoldpid(daemon->pidfile, 487 /* true if pidfile is inside chrootdir, or nochroot */ 488 !(cfg->chrootdir && cfg->chrootdir[0]) || 489 (cfg->chrootdir && cfg->chrootdir[0] && 490 strncmp(daemon->pidfile, cfg->chrootdir, 491 strlen(cfg->chrootdir))==0)); 492 } 493#endif 494 495 /* daemonize because pid is needed by the writepid func */ 496 if(!debug_mode && cfg->do_daemonize) { 497 detach(); 498 } 499 500 /* write new pidfile (while still root, so can be outside chroot) */ 501#ifdef HAVE_KILL 502 if(cfg->pidfile && cfg->pidfile[0]) { 503 writepid(daemon->pidfile, getpid()); 504 if(!(cfg->chrootdir && cfg->chrootdir[0]) || 505 (cfg->chrootdir && cfg->chrootdir[0] && 506 strncmp(daemon->pidfile, cfg->chrootdir, 507 strlen(cfg->chrootdir))==0)) { 508 /* delete of pidfile could potentially work, 509 * chown to get permissions */ 510 if(cfg->username && cfg->username[0]) { 511 if(chown(daemon->pidfile, uid, gid) == -1) { 512 log_err("cannot chown %u.%u %s: %s", 513 (unsigned)uid, (unsigned)gid, 514 daemon->pidfile, strerror(errno)); 515 } 516 } 517 } 518 } 519#else 520 (void)daemon; 521#endif 522 523 /* Set user context */ 524#ifdef HAVE_GETPWNAM 525 if(cfg->username && cfg->username[0]) { 526#ifdef HAVE_SETUSERCONTEXT 527 /* setusercontext does initgroups, setuid, setgid, and 528 * also resource limits from login config, but we 529 * still call setresuid, setresgid to be sure to set all uid*/ 530 if(setusercontext(NULL, pwd, uid, (unsigned) 531 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 532 log_warn("unable to setusercontext %s: %s", 533 cfg->username, strerror(errno)); 534#endif /* HAVE_SETUSERCONTEXT */ 535 } 536#endif /* HAVE_GETPWNAM */ 537 538 /* box into the chroot */ 539#ifdef HAVE_CHROOT 540 if(cfg->chrootdir && cfg->chrootdir[0]) { 541 if(chdir(cfg->chrootdir)) { 542 fatal_exit("unable to chdir to chroot %s: %s", 543 cfg->chrootdir, strerror(errno)); 544 } 545 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 546 if(chroot(cfg->chrootdir)) 547 fatal_exit("unable to chroot to %s: %s", 548 cfg->chrootdir, strerror(errno)); 549 if(chdir("/")) 550 fatal_exit("unable to chdir to / in chroot %s: %s", 551 cfg->chrootdir, strerror(errno)); 552 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 553 if(strncmp(*cfgfile, cfg->chrootdir, 554 strlen(cfg->chrootdir)) == 0) 555 (*cfgfile) += strlen(cfg->chrootdir); 556 557 /* adjust stored pidfile for chroot */ 558 if(daemon->pidfile && daemon->pidfile[0] && 559 strncmp(daemon->pidfile, cfg->chrootdir, 560 strlen(cfg->chrootdir))==0) { 561 char* old = daemon->pidfile; 562 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 563 free(old); 564 if(!daemon->pidfile) 565 log_err("out of memory in pidfile adjust"); 566 } 567 daemon->chroot = strdup(cfg->chrootdir); 568 if(!daemon->chroot) 569 log_err("out of memory in daemon chroot dir storage"); 570 } 571#else 572 (void)cfgfile; 573#endif 574 /* change to working directory inside chroot */ 575 if(cfg->directory && cfg->directory[0]) { 576 char* dir = cfg->directory; 577 if(cfg->chrootdir && cfg->chrootdir[0] && 578 strncmp(dir, cfg->chrootdir, 579 strlen(cfg->chrootdir)) == 0) 580 dir += strlen(cfg->chrootdir); 581 if(dir[0]) { 582 if(chdir(dir)) { 583 fatal_exit("Could not chdir to %s: %s", 584 dir, strerror(errno)); 585 } 586 verbose(VERB_QUERY, "chdir to %s", dir); 587 } 588 } 589 590 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 591#ifdef HAVE_GETPWNAM 592 if(cfg->username && cfg->username[0]) { 593# ifdef HAVE_INITGROUPS 594 if(initgroups(cfg->username, gid) != 0) 595 log_warn("unable to initgroups %s: %s", 596 cfg->username, strerror(errno)); 597# endif /* HAVE_INITGROUPS */ 598 endpwent(); 599 600#ifdef HAVE_SETRESGID 601 if(setresgid(gid,gid,gid) != 0) 602#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 603 if(setregid(gid,gid) != 0) 604#else /* use setgid */ 605 if(setgid(gid) != 0) 606#endif /* HAVE_SETRESGID */ 607 fatal_exit("unable to set group id of %s: %s", 608 cfg->username, strerror(errno)); 609#ifdef HAVE_SETRESUID 610 if(setresuid(uid,uid,uid) != 0) 611#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 612 if(setreuid(uid,uid) != 0) 613#else /* use setuid */ 614 if(setuid(uid) != 0) 615#endif /* HAVE_SETRESUID */ 616 fatal_exit("unable to set user id of %s: %s", 617 cfg->username, strerror(errno)); 618 verbose(VERB_QUERY, "drop user privileges, run as %s", 619 cfg->username); 620 } 621#endif /* HAVE_GETPWNAM */ 622 /* file logging inited after chroot,chdir,setuid is done so that 623 * it would succeed on SIGHUP as well */ 624 if(!cfg->use_syslog) 625 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 626} 627 628/** 629 * Run the daemon. 630 * @param cfgfile: the config file name. 631 * @param cmdline_verbose: verbosity resulting from commandline -v. 632 * These increase verbosity as specified in the config file. 633 * @param debug_mode: if set, do not daemonize. 634 */ 635static void 636run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 637{ 638 struct config_file* cfg = NULL; 639 struct daemon* daemon = NULL; 640 int done_setup = 0; 641 642 if(!(daemon = daemon_init())) 643 fatal_exit("alloc failure"); 644 while(!daemon->need_to_exit) { 645 if(done_setup) 646 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 647 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 648 649 /* config stuff */ 650 if(!(cfg = config_create())) 651 fatal_exit("Could not alloc config defaults"); 652 if(!config_read(cfg, cfgfile, daemon->chroot)) { 653 if(errno != ENOENT) 654 fatal_exit("Could not read config file: %s", 655 cfgfile); 656 log_warn("Continuing with default config settings"); 657 } 658 apply_settings(daemon, cfg, cmdline_verbose); 659 660 /* prepare */ 661 if(!daemon_open_shared_ports(daemon)) 662 fatal_exit("could not open ports"); 663 if(!done_setup) { 664 perform_setup(daemon, cfg, debug_mode, &cfgfile); 665 done_setup = 1; 666 } else { 667 /* reopen log after HUP to facilitate log rotation */ 668 if(!cfg->use_syslog) 669 log_init(cfg->logfile, 0, cfg->chrootdir); 670 } 671 /* work */ 672 daemon_fork(daemon); 673 674 /* clean up for restart */ 675 verbose(VERB_ALGO, "cleanup."); 676 daemon_cleanup(daemon); 677 config_delete(cfg); 678 } 679 verbose(VERB_ALGO, "Exit cleanup."); 680 /* this unlink may not work if the pidfile is located outside 681 * of the chroot/workdir or we no longer have permissions */ 682 if(daemon->pidfile) { 683 int fd; 684 /* truncate pidfile */ 685 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 686 if(fd != -1) 687 close(fd); 688 /* delete pidfile */ 689 unlink(daemon->pidfile); 690 } 691 daemon_delete(daemon); 692} 693 694/** getopt global, in case header files fail to declare it. */ 695extern int optind; 696/** getopt global, in case header files fail to declare it. */ 697extern char* optarg; 698 699/** 700 * main program. Set options given commandline arguments. 701 * @param argc: number of commandline arguments. 702 * @param argv: array of commandline arguments. 703 * @return: exit status of the program. 704 */ 705int 706main(int argc, char* argv[]) 707{ 708 int c; 709 const char* cfgfile = CONFIGFILE; 710 const char* winopt = NULL; 711 int cmdline_verbose = 0; 712 int debug_mode = 0; 713#ifdef UB_ON_WINDOWS 714 int cmdline_cfg = 0; 715#endif 716 717#ifdef HAVE_SBRK 718 /* take debug snapshot of heap */ 719 unbound_start_brk = sbrk(0); 720#endif 721 722 log_init(NULL, 0, NULL); 723 log_ident_set(strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]); 724 /* parse the options */ 725 while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 726 switch(c) { 727 case 'c': 728 cfgfile = optarg; 729#ifdef UB_ON_WINDOWS 730 cmdline_cfg = 1; 731#endif 732 break; 733 case 'v': 734 cmdline_verbose ++; 735 verbosity++; 736 break; 737 case 'd': 738 debug_mode = 1; 739 break; 740 case 'w': 741 winopt = optarg; 742 break; 743 case '?': 744 case 'h': 745 default: 746 usage(); 747 return 1; 748 } 749 } 750 argc -= optind; 751 argv += optind; 752 753 if(winopt) { 754#ifdef UB_ON_WINDOWS 755 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 756 cmdline_cfg); 757#else 758 fatal_exit("option not supported"); 759#endif 760 } 761 762 if(argc != 0) { 763 usage(); 764 return 1; 765 } 766 767 run_daemon(cfgfile, cmdline_verbose, debug_mode); 768 log_init(NULL, 0, NULL); /* close logfile */ 769 return 0; 770} 771