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/data/msgreply.h" 57 #include "util/module.h" 58 #include "util/net_help.h" 59 #include <signal.h> 60 #include <fcntl.h> 61 #include <openssl/crypto.h> 62 #ifdef HAVE_PWD_H 63 #include <pwd.h> 64 #endif 65 #ifdef HAVE_GRP_H 66 #include <grp.h> 67 #endif 68 69 #ifndef S_SPLINT_S 70 /* splint chokes on this system header file */ 71 #ifdef HAVE_SYS_RESOURCE_H 72 #include <sys/resource.h> 73 #endif 74 #endif /* S_SPLINT_S */ 75 #ifdef HAVE_LOGIN_CAP_H 76 #include <login_cap.h> 77 #endif 78 79 #ifdef USE_MINI_EVENT 80 # ifdef USE_WINSOCK 81 # include "util/winsock_event.h" 82 # else 83 # include "util/mini_event.h" 84 # endif 85 #else 86 # include <event.h> 87 #endif 88 89 #ifdef UB_ON_WINDOWS 90 # include "winrc/win_svc.h" 91 #endif 92 93 #ifdef HAVE_NSS 94 /* nss3 */ 95 # include "nss.h" 96 #endif 97 98 /** global debug value to keep track of heap memory allocation */ 99 void* unbound_start_brk = 0; 100 101 #if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 102 static const char* ev_backend2str(int b) 103 { 104 switch(b) { 105 case EVBACKEND_SELECT: return "select"; 106 case EVBACKEND_POLL: return "poll"; 107 case EVBACKEND_EPOLL: return "epoll"; 108 case EVBACKEND_KQUEUE: return "kqueue"; 109 case EVBACKEND_DEVPOLL: return "devpoll"; 110 case EVBACKEND_PORT: return "evport"; 111 } 112 return "unknown"; 113 } 114 #endif 115 116 /** get the event system in use */ 117 static void get_event_sys(const char** n, const char** s, const char** m) 118 { 119 #ifdef USE_WINSOCK 120 *n = "event"; 121 *s = "winsock"; 122 *m = "WSAWaitForMultipleEvents"; 123 #elif defined(USE_MINI_EVENT) 124 *n = "mini-event"; 125 *s = "internal"; 126 *m = "select"; 127 #else 128 struct event_base* b; 129 *s = event_get_version(); 130 # ifdef HAVE_EVENT_BASE_GET_METHOD 131 *n = "libevent"; 132 b = event_base_new(); 133 *m = event_base_get_method(b); 134 # elif defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 135 *n = "libev"; 136 b = (struct event_base*)ev_default_loop(EVFLAG_AUTO); 137 *m = ev_backend2str(ev_backend((struct ev_loop*)b)); 138 # else 139 *n = "unknown"; 140 *m = "not obtainable"; 141 b = NULL; 142 # endif 143 # ifdef HAVE_EVENT_BASE_FREE 144 event_base_free(b); 145 # endif 146 #endif 147 } 148 149 /** print usage. */ 150 static void usage() 151 { 152 const char** m; 153 const char *evnm="event", *evsys="", *evmethod=""; 154 printf("usage: unbound [options]\n"); 155 printf(" start unbound daemon DNS resolver.\n"); 156 printf("-h this help\n"); 157 printf("-c file config file to read instead of %s\n", CONFIGFILE); 158 printf(" file format is described in unbound.conf(5).\n"); 159 printf("-d do not fork into the background.\n"); 160 printf("-v verbose (more times to increase verbosity)\n"); 161 #ifdef UB_ON_WINDOWS 162 printf("-w opt windows option: \n"); 163 printf(" install, remove - manage the services entry\n"); 164 printf(" service - used to start from services control panel\n"); 165 #endif 166 printf("Version %s\n", PACKAGE_VERSION); 167 get_event_sys(&evnm, &evsys, &evmethod); 168 printf("linked libs: %s %s (it uses %s), %s\n", 169 evnm, evsys, evmethod, 170 #ifdef HAVE_SSL 171 SSLeay_version(SSLEAY_VERSION) 172 #elif defined(HAVE_NSS) 173 NSS_GetVersion() 174 #endif 175 ); 176 printf("linked modules:"); 177 for(m = module_list_avail(); *m; m++) 178 printf(" %s", *m); 179 printf("\n"); 180 printf("configured for %s on %s with options:%s\n", 181 CONFIGURE_TARGET, CONFIGURE_DATE, CONFIGURE_BUILD_WITH); 182 printf("BSD licensed, see LICENSE in source package for details.\n"); 183 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 184 } 185 186 #ifndef unbound_testbound 187 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 188 { 189 log_assert(0); 190 return 0; 191 } 192 #endif 193 194 /** check file descriptor count */ 195 static void 196 checkrlimits(struct config_file* cfg) 197 { 198 #ifndef S_SPLINT_S 199 #ifdef HAVE_GETRLIMIT 200 /* list has number of ports to listen to, ifs number addresses */ 201 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 202 (int)cfg->incoming_num_tcp:0)); 203 size_t listen_ifs = (size_t)(cfg->num_ifs==0? 204 ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 205 (cfg->do_ip6?1:0)):cfg->num_ifs); 206 size_t listen_num = list*listen_ifs; 207 size_t outudpnum = (size_t)cfg->outgoing_num_ports; 208 size_t outtcpnum = cfg->outgoing_num_tcp; 209 size_t misc = 4; /* logfile, pidfile, stdout... */ 210 size_t perthread_noudp = listen_num + outtcpnum + 211 2/*cmdpipe*/ + 2/*libevent*/ + misc; 212 size_t perthread = perthread_noudp + outudpnum; 213 214 #if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 215 int numthread = 1; /* it forks */ 216 #else 217 int numthread = (cfg->num_threads?cfg->num_threads:1); 218 #endif 219 size_t total = numthread * perthread + misc; 220 size_t avail; 221 struct rlimit rlim; 222 223 if(total > 1024 && 224 strncmp(event_get_version(), "mini-event", 10) == 0) { 225 log_warn("too many file descriptors requested. The builtin" 226 "mini-event cannot handle more than 1024. Config " 227 "for less fds or compile with libevent"); 228 if(numthread*perthread_noudp+15 > 1024) 229 fatal_exit("too much tcp. not enough fds."); 230 cfg->outgoing_num_ports = (int)((1024 231 - numthread*perthread_noudp 232 - 10 /* safety margin */) /numthread); 233 log_warn("continuing with less udp ports: %u", 234 cfg->outgoing_num_ports); 235 total = 1024; 236 } 237 if(perthread > 64 && 238 strncmp(event_get_version(), "winsock-event", 13) == 0) { 239 log_err("too many file descriptors requested. The winsock" 240 " event handler cannot handle more than 64 per " 241 " thread. Config for less fds"); 242 if(perthread_noudp+2 > 64) 243 fatal_exit("too much tcp. not enough fds."); 244 cfg->outgoing_num_ports = (int)((64 245 - perthread_noudp 246 - 2/* safety margin */)); 247 log_warn("continuing with less udp ports: %u", 248 cfg->outgoing_num_ports); 249 total = numthread*(perthread_noudp+ 250 (size_t)cfg->outgoing_num_ports)+misc; 251 } 252 if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 253 log_warn("getrlimit: %s", strerror(errno)); 254 return; 255 } 256 if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 257 return; 258 if((size_t)rlim.rlim_cur < total) { 259 avail = (size_t)rlim.rlim_cur; 260 rlim.rlim_cur = (rlim_t)(total + 10); 261 rlim.rlim_max = (rlim_t)(total + 10); 262 #ifdef HAVE_SETRLIMIT 263 if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 264 log_warn("setrlimit: %s", strerror(errno)); 265 #else 266 if(1) { 267 #endif 268 log_warn("cannot increase max open fds from %u to %u", 269 (unsigned)avail, (unsigned)total+10); 270 /* check that calculation below does not underflow, 271 * with 15 as margin */ 272 if(numthread*perthread_noudp+15 > avail) 273 fatal_exit("too much tcp. not enough fds."); 274 cfg->outgoing_num_ports = (int)((avail 275 - numthread*perthread_noudp 276 - 10 /* safety margin */) /numthread); 277 log_warn("continuing with less udp ports: %u", 278 cfg->outgoing_num_ports); 279 log_warn("increase ulimit or decrease threads, " 280 "ports in config to remove this warning"); 281 return; 282 } 283 log_warn("increased limit(open files) from %u to %u", 284 (unsigned)avail, (unsigned)total+10); 285 } 286 #else 287 (void)cfg; 288 #endif /* HAVE_GETRLIMIT */ 289 #endif /* S_SPLINT_S */ 290 } 291 292 /** set verbosity, check rlimits, cache settings */ 293 static void 294 apply_settings(struct daemon* daemon, struct config_file* cfg, 295 int cmdline_verbose) 296 { 297 /* apply if they have changed */ 298 verbosity = cmdline_verbose + cfg->verbosity; 299 daemon_apply_cfg(daemon, cfg); 300 checkrlimits(cfg); 301 } 302 303 #ifdef HAVE_KILL 304 /** Read existing pid from pidfile. 305 * @param file: file name of pid file. 306 * @return: the pid from the file or -1 if none. 307 */ 308 static pid_t 309 readpid (const char* file) 310 { 311 int fd; 312 pid_t pid; 313 char pidbuf[32]; 314 char* t; 315 ssize_t l; 316 317 if ((fd = open(file, O_RDONLY)) == -1) { 318 if(errno != ENOENT) 319 log_err("Could not read pidfile %s: %s", 320 file, strerror(errno)); 321 return -1; 322 } 323 324 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 325 if(errno != ENOENT) 326 log_err("Could not read pidfile %s: %s", 327 file, strerror(errno)); 328 close(fd); 329 return -1; 330 } 331 332 close(fd); 333 334 /* Empty pidfile means no pidfile... */ 335 if (l == 0) { 336 return -1; 337 } 338 339 pidbuf[sizeof(pidbuf)-1] = 0; 340 pid = (pid_t)strtol(pidbuf, &t, 10); 341 342 if (*t && *t != '\n') { 343 return -1; 344 } 345 return pid; 346 } 347 348 /** write pid to file. 349 * @param pidfile: file name of pid file. 350 * @param pid: pid to write to file. 351 */ 352 static void 353 writepid (const char* pidfile, pid_t pid) 354 { 355 FILE* f; 356 357 if ((f = fopen(pidfile, "w")) == NULL ) { 358 log_err("cannot open pidfile %s: %s", 359 pidfile, strerror(errno)); 360 return; 361 } 362 if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 363 log_err("cannot write to pidfile %s: %s", 364 pidfile, strerror(errno)); 365 } 366 fclose(f); 367 } 368 369 /** 370 * check old pid file. 371 * @param pidfile: the file name of the pid file. 372 * @param inchroot: if pidfile is inchroot and we can thus expect to 373 * be able to delete it. 374 */ 375 static void 376 checkoldpid(char* pidfile, int inchroot) 377 { 378 pid_t old; 379 if((old = readpid(pidfile)) != -1) { 380 /* see if it is still alive */ 381 if(kill(old, 0) == 0 || errno == EPERM) 382 log_warn("unbound is already running as pid %u.", 383 (unsigned)old); 384 else if(inchroot) 385 log_warn("did not exit gracefully last time (%u)", 386 (unsigned)old); 387 } 388 } 389 #endif /* HAVE_KILL */ 390 391 /** detach from command line */ 392 static void 393 detach(void) 394 { 395 #if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 396 /* use POSIX daemon(3) function */ 397 if(daemon(1, 0) != 0) 398 fatal_exit("daemon failed: %s", strerror(errno)); 399 #else /* no HAVE_DAEMON */ 400 #ifdef HAVE_FORK 401 int fd; 402 /* Take off... */ 403 switch (fork()) { 404 case 0: 405 break; 406 case -1: 407 fatal_exit("fork failed: %s", strerror(errno)); 408 default: 409 /* exit interactive session */ 410 exit(0); 411 } 412 /* detach */ 413 #ifdef HAVE_SETSID 414 if(setsid() == -1) 415 fatal_exit("setsid() failed: %s", strerror(errno)); 416 #endif 417 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 418 (void)dup2(fd, STDIN_FILENO); 419 (void)dup2(fd, STDOUT_FILENO); 420 (void)dup2(fd, STDERR_FILENO); 421 if (fd > 2) 422 (void)close(fd); 423 } 424 #endif /* HAVE_FORK */ 425 #endif /* HAVE_DAEMON */ 426 } 427 428 /** daemonize, drop user priviliges and chroot if needed */ 429 static void 430 perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 431 const char** cfgfile) 432 { 433 #ifdef HAVE_GETPWNAM 434 struct passwd *pwd = NULL; 435 uid_t uid; 436 gid_t gid; 437 /* initialize, but not to 0 (root) */ 438 memset(&uid, 112, sizeof(uid)); 439 memset(&gid, 112, sizeof(gid)); 440 log_assert(cfg); 441 442 if(cfg->username && cfg->username[0]) { 443 if((pwd = getpwnam(cfg->username)) == NULL) 444 fatal_exit("user '%s' does not exist.", cfg->username); 445 uid = pwd->pw_uid; 446 gid = pwd->pw_gid; 447 /* endpwent below, in case we need pwd for setusercontext */ 448 } 449 #endif 450 451 /* init syslog (as root) if needed, before daemonize, otherwise 452 * a fork error could not be printed since daemonize closed stderr.*/ 453 if(cfg->use_syslog) { 454 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 455 } 456 /* if using a logfile, we cannot open it because the logfile would 457 * be created with the wrong permissions, we cannot chown it because 458 * we cannot chown system logfiles, so we do not open at all. 459 * So, using a logfile, the user does not see errors unless -d is 460 * given to unbound on the commandline. */ 461 462 /* read ssl keys while superuser and outside chroot */ 463 #ifdef HAVE_SSL 464 if(!(daemon->rc = daemon_remote_create(cfg))) 465 fatal_exit("could not set up remote-control"); 466 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 467 if(!(daemon->listen_sslctx = listen_sslctx_create( 468 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 469 fatal_exit("could not set up listen SSL_CTX"); 470 } 471 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 472 fatal_exit("could not set up connect SSL_CTX"); 473 #endif 474 475 #ifdef HAVE_KILL 476 /* check old pid file before forking */ 477 if(cfg->pidfile && cfg->pidfile[0]) { 478 /* calculate position of pidfile */ 479 if(cfg->pidfile[0] == '/') 480 daemon->pidfile = strdup(cfg->pidfile); 481 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 482 cfg, 1); 483 if(!daemon->pidfile) 484 fatal_exit("pidfile alloc: out of memory"); 485 checkoldpid(daemon->pidfile, 486 /* true if pidfile is inside chrootdir, or nochroot */ 487 !(cfg->chrootdir && cfg->chrootdir[0]) || 488 (cfg->chrootdir && cfg->chrootdir[0] && 489 strncmp(daemon->pidfile, cfg->chrootdir, 490 strlen(cfg->chrootdir))==0)); 491 } 492 #endif 493 494 /* daemonize because pid is needed by the writepid func */ 495 if(!debug_mode && cfg->do_daemonize) { 496 detach(); 497 } 498 499 /* write new pidfile (while still root, so can be outside chroot) */ 500 #ifdef HAVE_KILL 501 if(cfg->pidfile && cfg->pidfile[0]) { 502 writepid(daemon->pidfile, getpid()); 503 if(!(cfg->chrootdir && cfg->chrootdir[0]) || 504 (cfg->chrootdir && cfg->chrootdir[0] && 505 strncmp(daemon->pidfile, cfg->chrootdir, 506 strlen(cfg->chrootdir))==0)) { 507 /* delete of pidfile could potentially work, 508 * chown to get permissions */ 509 if(cfg->username && cfg->username[0]) { 510 if(chown(daemon->pidfile, uid, gid) == -1) { 511 log_err("cannot chown %u.%u %s: %s", 512 (unsigned)uid, (unsigned)gid, 513 daemon->pidfile, strerror(errno)); 514 } 515 } 516 } 517 } 518 #else 519 (void)daemon; 520 #endif 521 522 /* Set user context */ 523 #ifdef HAVE_GETPWNAM 524 if(cfg->username && cfg->username[0]) { 525 #ifdef HAVE_SETUSERCONTEXT 526 /* setusercontext does initgroups, setuid, setgid, and 527 * also resource limits from login config, but we 528 * still call setresuid, setresgid to be sure to set all uid*/ 529 if(setusercontext(NULL, pwd, uid, (unsigned) 530 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 531 log_warn("unable to setusercontext %s: %s", 532 cfg->username, strerror(errno)); 533 #endif /* HAVE_SETUSERCONTEXT */ 534 } 535 #endif /* HAVE_GETPWNAM */ 536 537 /* box into the chroot */ 538 #ifdef HAVE_CHROOT 539 if(cfg->chrootdir && cfg->chrootdir[0]) { 540 if(chdir(cfg->chrootdir)) { 541 fatal_exit("unable to chdir to chroot %s: %s", 542 cfg->chrootdir, strerror(errno)); 543 } 544 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 545 if(chroot(cfg->chrootdir)) 546 fatal_exit("unable to chroot to %s: %s", 547 cfg->chrootdir, strerror(errno)); 548 if(chdir("/")) 549 fatal_exit("unable to chdir to / in chroot %s: %s", 550 cfg->chrootdir, strerror(errno)); 551 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 552 if(strncmp(*cfgfile, cfg->chrootdir, 553 strlen(cfg->chrootdir)) == 0) 554 (*cfgfile) += strlen(cfg->chrootdir); 555 556 /* adjust stored pidfile for chroot */ 557 if(daemon->pidfile && daemon->pidfile[0] && 558 strncmp(daemon->pidfile, cfg->chrootdir, 559 strlen(cfg->chrootdir))==0) { 560 char* old = daemon->pidfile; 561 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 562 free(old); 563 if(!daemon->pidfile) 564 log_err("out of memory in pidfile adjust"); 565 } 566 daemon->chroot = strdup(cfg->chrootdir); 567 if(!daemon->chroot) 568 log_err("out of memory in daemon chroot dir storage"); 569 } 570 #else 571 (void)cfgfile; 572 #endif 573 /* change to working directory inside chroot */ 574 if(cfg->directory && cfg->directory[0]) { 575 char* dir = cfg->directory; 576 if(cfg->chrootdir && cfg->chrootdir[0] && 577 strncmp(dir, cfg->chrootdir, 578 strlen(cfg->chrootdir)) == 0) 579 dir += strlen(cfg->chrootdir); 580 if(dir[0]) { 581 if(chdir(dir)) { 582 fatal_exit("Could not chdir to %s: %s", 583 dir, strerror(errno)); 584 } 585 verbose(VERB_QUERY, "chdir to %s", dir); 586 } 587 } 588 589 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 590 #ifdef HAVE_GETPWNAM 591 if(cfg->username && cfg->username[0]) { 592 # ifdef HAVE_INITGROUPS 593 if(initgroups(cfg->username, gid) != 0) 594 log_warn("unable to initgroups %s: %s", 595 cfg->username, strerror(errno)); 596 # endif /* HAVE_INITGROUPS */ 597 endpwent(); 598 599 #ifdef HAVE_SETRESGID 600 if(setresgid(gid,gid,gid) != 0) 601 #elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 602 if(setregid(gid,gid) != 0) 603 #else /* use setgid */ 604 if(setgid(gid) != 0) 605 #endif /* HAVE_SETRESGID */ 606 fatal_exit("unable to set group id of %s: %s", 607 cfg->username, strerror(errno)); 608 #ifdef HAVE_SETRESUID 609 if(setresuid(uid,uid,uid) != 0) 610 #elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 611 if(setreuid(uid,uid) != 0) 612 #else /* use setuid */ 613 if(setuid(uid) != 0) 614 #endif /* HAVE_SETRESUID */ 615 fatal_exit("unable to set user id of %s: %s", 616 cfg->username, strerror(errno)); 617 verbose(VERB_QUERY, "drop user privileges, run as %s", 618 cfg->username); 619 } 620 #endif /* HAVE_GETPWNAM */ 621 /* file logging inited after chroot,chdir,setuid is done so that 622 * it would succeed on SIGHUP as well */ 623 if(!cfg->use_syslog) 624 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 625 } 626 627 /** 628 * Run the daemon. 629 * @param cfgfile: the config file name. 630 * @param cmdline_verbose: verbosity resulting from commandline -v. 631 * These increase verbosity as specified in the config file. 632 * @param debug_mode: if set, do not daemonize. 633 */ 634 static void 635 run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 636 { 637 struct config_file* cfg = NULL; 638 struct daemon* daemon = NULL; 639 int done_setup = 0; 640 641 if(!(daemon = daemon_init())) 642 fatal_exit("alloc failure"); 643 while(!daemon->need_to_exit) { 644 if(done_setup) 645 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 646 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 647 648 /* config stuff */ 649 if(!(cfg = config_create())) 650 fatal_exit("Could not alloc config defaults"); 651 if(!config_read(cfg, cfgfile, daemon->chroot)) { 652 if(errno != ENOENT) 653 fatal_exit("Could not read config file: %s", 654 cfgfile); 655 log_warn("Continuing with default config settings"); 656 } 657 apply_settings(daemon, cfg, cmdline_verbose); 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. */ 694 extern int optind; 695 /** getopt global, in case header files fail to declare it. */ 696 extern 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 */ 704 int 705 main(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 = 1; 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