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