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 */ 107 void* unbound_start_brk = 0; 108 #endif 109 110 #if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 111 static 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 */ 126 static 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. */ 159 static 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 194 int 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 */ 202 static void 203 checkrlimits(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 */ 300 static void 301 apply_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 */ 319 static pid_t 320 readpid (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 */ 363 static void 364 writepid (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 */ 386 static void 387 checkoldpid(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 */ 403 static void 404 detach(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 */ 440 static void 441 perform_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 uid_t uid; 447 gid_t gid; 448 /* initialize, but not to 0 (root) */ 449 memset(&uid, 112, sizeof(uid)); 450 memset(&gid, 112, sizeof(gid)); 451 log_assert(cfg); 452 453 if(cfg->username && cfg->username[0]) { 454 if((pwd = getpwnam(cfg->username)) == NULL) 455 fatal_exit("user '%s' does not exist.", cfg->username); 456 uid = pwd->pw_uid; 457 gid = pwd->pw_gid; 458 /* endpwent below, in case we need pwd for setusercontext */ 459 } 460 #endif 461 462 /* init syslog (as root) if needed, before daemonize, otherwise 463 * a fork error could not be printed since daemonize closed stderr.*/ 464 if(cfg->use_syslog) { 465 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 466 } 467 /* if using a logfile, we cannot open it because the logfile would 468 * be created with the wrong permissions, we cannot chown it because 469 * we cannot chown system logfiles, so we do not open at all. 470 * So, using a logfile, the user does not see errors unless -d is 471 * given to unbound on the commandline. */ 472 473 /* read ssl keys while superuser and outside chroot */ 474 #ifdef HAVE_SSL 475 if(!(daemon->rc = daemon_remote_create(cfg))) 476 fatal_exit("could not set up remote-control"); 477 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 478 if(!(daemon->listen_sslctx = listen_sslctx_create( 479 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 480 fatal_exit("could not set up listen SSL_CTX"); 481 } 482 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 483 fatal_exit("could not set up connect SSL_CTX"); 484 #endif 485 486 #ifdef HAVE_KILL 487 /* check old pid file before forking */ 488 if(cfg->pidfile && cfg->pidfile[0]) { 489 /* calculate position of pidfile */ 490 if(cfg->pidfile[0] == '/') 491 daemon->pidfile = strdup(cfg->pidfile); 492 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 493 cfg, 1); 494 if(!daemon->pidfile) 495 fatal_exit("pidfile alloc: out of memory"); 496 checkoldpid(daemon->pidfile, 497 /* true if pidfile is inside chrootdir, or nochroot */ 498 !(cfg->chrootdir && cfg->chrootdir[0]) || 499 (cfg->chrootdir && cfg->chrootdir[0] && 500 strncmp(daemon->pidfile, cfg->chrootdir, 501 strlen(cfg->chrootdir))==0)); 502 } 503 #endif 504 505 /* daemonize because pid is needed by the writepid func */ 506 if(!debug_mode && cfg->do_daemonize) { 507 detach(); 508 } 509 510 /* write new pidfile (while still root, so can be outside chroot) */ 511 #ifdef HAVE_KILL 512 if(cfg->pidfile && cfg->pidfile[0]) { 513 writepid(daemon->pidfile, getpid()); 514 if(!(cfg->chrootdir && cfg->chrootdir[0]) || 515 (cfg->chrootdir && cfg->chrootdir[0] && 516 strncmp(daemon->pidfile, cfg->chrootdir, 517 strlen(cfg->chrootdir))==0)) { 518 /* delete of pidfile could potentially work, 519 * chown to get permissions */ 520 if(cfg->username && cfg->username[0]) { 521 if(chown(daemon->pidfile, uid, gid) == -1) { 522 log_err("cannot chown %u.%u %s: %s", 523 (unsigned)uid, (unsigned)gid, 524 daemon->pidfile, strerror(errno)); 525 } 526 } 527 } 528 } 529 #else 530 (void)daemon; 531 #endif 532 533 /* Set user context */ 534 #ifdef HAVE_GETPWNAM 535 if(cfg->username && cfg->username[0]) { 536 #ifdef HAVE_SETUSERCONTEXT 537 /* setusercontext does initgroups, setuid, setgid, and 538 * also resource limits from login config, but we 539 * still call setresuid, setresgid to be sure to set all uid*/ 540 if(setusercontext(NULL, pwd, uid, (unsigned) 541 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 542 log_warn("unable to setusercontext %s: %s", 543 cfg->username, strerror(errno)); 544 #endif /* HAVE_SETUSERCONTEXT */ 545 } 546 #endif /* HAVE_GETPWNAM */ 547 548 /* box into the chroot */ 549 #ifdef HAVE_CHROOT 550 if(cfg->chrootdir && cfg->chrootdir[0]) { 551 if(chdir(cfg->chrootdir)) { 552 fatal_exit("unable to chdir to chroot %s: %s", 553 cfg->chrootdir, strerror(errno)); 554 } 555 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 556 if(chroot(cfg->chrootdir)) 557 fatal_exit("unable to chroot to %s: %s", 558 cfg->chrootdir, strerror(errno)); 559 if(chdir("/")) 560 fatal_exit("unable to chdir to / in chroot %s: %s", 561 cfg->chrootdir, strerror(errno)); 562 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 563 if(strncmp(*cfgfile, cfg->chrootdir, 564 strlen(cfg->chrootdir)) == 0) 565 (*cfgfile) += strlen(cfg->chrootdir); 566 567 /* adjust stored pidfile for chroot */ 568 if(daemon->pidfile && daemon->pidfile[0] && 569 strncmp(daemon->pidfile, cfg->chrootdir, 570 strlen(cfg->chrootdir))==0) { 571 char* old = daemon->pidfile; 572 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 573 free(old); 574 if(!daemon->pidfile) 575 log_err("out of memory in pidfile adjust"); 576 } 577 daemon->chroot = strdup(cfg->chrootdir); 578 if(!daemon->chroot) 579 log_err("out of memory in daemon chroot dir storage"); 580 } 581 #else 582 (void)cfgfile; 583 #endif 584 /* change to working directory inside chroot */ 585 if(cfg->directory && cfg->directory[0]) { 586 char* dir = cfg->directory; 587 if(cfg->chrootdir && cfg->chrootdir[0] && 588 strncmp(dir, cfg->chrootdir, 589 strlen(cfg->chrootdir)) == 0) 590 dir += strlen(cfg->chrootdir); 591 if(dir[0]) { 592 if(chdir(dir)) { 593 fatal_exit("Could not chdir to %s: %s", 594 dir, strerror(errno)); 595 } 596 verbose(VERB_QUERY, "chdir to %s", dir); 597 } 598 } 599 600 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 601 #ifdef HAVE_GETPWNAM 602 if(cfg->username && cfg->username[0]) { 603 # ifdef HAVE_INITGROUPS 604 if(initgroups(cfg->username, gid) != 0) 605 log_warn("unable to initgroups %s: %s", 606 cfg->username, strerror(errno)); 607 # endif /* HAVE_INITGROUPS */ 608 endpwent(); 609 610 #ifdef HAVE_SETRESGID 611 if(setresgid(gid,gid,gid) != 0) 612 #elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 613 if(setregid(gid,gid) != 0) 614 #else /* use setgid */ 615 if(setgid(gid) != 0) 616 #endif /* HAVE_SETRESGID */ 617 fatal_exit("unable to set group id of %s: %s", 618 cfg->username, strerror(errno)); 619 #ifdef HAVE_SETRESUID 620 if(setresuid(uid,uid,uid) != 0) 621 #elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 622 if(setreuid(uid,uid) != 0) 623 #else /* use setuid */ 624 if(setuid(uid) != 0) 625 #endif /* HAVE_SETRESUID */ 626 fatal_exit("unable to set user id of %s: %s", 627 cfg->username, strerror(errno)); 628 verbose(VERB_QUERY, "drop user privileges, run as %s", 629 cfg->username); 630 } 631 #endif /* HAVE_GETPWNAM */ 632 /* file logging inited after chroot,chdir,setuid is done so that 633 * it would succeed on SIGHUP as well */ 634 if(!cfg->use_syslog) 635 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 636 } 637 638 /** 639 * Run the daemon. 640 * @param cfgfile: the config file name. 641 * @param cmdline_verbose: verbosity resulting from commandline -v. 642 * These increase verbosity as specified in the config file. 643 * @param debug_mode: if set, do not daemonize. 644 */ 645 static void 646 run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 647 { 648 struct config_file* cfg = NULL; 649 struct daemon* daemon = NULL; 650 int done_setup = 0; 651 652 if(!(daemon = daemon_init())) 653 fatal_exit("alloc failure"); 654 while(!daemon->need_to_exit) { 655 if(done_setup) 656 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 657 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 658 659 /* config stuff */ 660 if(!(cfg = config_create())) 661 fatal_exit("Could not alloc config defaults"); 662 if(!config_read(cfg, cfgfile, daemon->chroot)) { 663 if(errno != ENOENT) 664 fatal_exit("Could not read config file: %s", 665 cfgfile); 666 log_warn("Continuing with default config settings"); 667 } 668 apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 669 670 /* prepare */ 671 if(!daemon_open_shared_ports(daemon)) 672 fatal_exit("could not open ports"); 673 if(!done_setup) { 674 perform_setup(daemon, cfg, debug_mode, &cfgfile); 675 done_setup = 1; 676 } else { 677 /* reopen log after HUP to facilitate log rotation */ 678 if(!cfg->use_syslog) 679 log_init(cfg->logfile, 0, cfg->chrootdir); 680 } 681 /* work */ 682 daemon_fork(daemon); 683 684 /* clean up for restart */ 685 verbose(VERB_ALGO, "cleanup."); 686 daemon_cleanup(daemon); 687 config_delete(cfg); 688 } 689 verbose(VERB_ALGO, "Exit cleanup."); 690 /* this unlink may not work if the pidfile is located outside 691 * of the chroot/workdir or we no longer have permissions */ 692 if(daemon->pidfile) { 693 int fd; 694 /* truncate pidfile */ 695 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 696 if(fd != -1) 697 close(fd); 698 /* delete pidfile */ 699 unlink(daemon->pidfile); 700 } 701 daemon_delete(daemon); 702 } 703 704 /** getopt global, in case header files fail to declare it. */ 705 extern int optind; 706 /** getopt global, in case header files fail to declare it. */ 707 extern char* optarg; 708 709 /** 710 * main program. Set options given commandline arguments. 711 * @param argc: number of commandline arguments. 712 * @param argv: array of commandline arguments. 713 * @return: exit status of the program. 714 */ 715 int 716 main(int argc, char* argv[]) 717 { 718 int c; 719 const char* cfgfile = CONFIGFILE; 720 const char* winopt = NULL; 721 int cmdline_verbose = 0; 722 int debug_mode = 0; 723 #ifdef UB_ON_WINDOWS 724 int cmdline_cfg = 0; 725 #endif 726 727 #ifdef HAVE_SBRK 728 /* take debug snapshot of heap */ 729 unbound_start_brk = sbrk(0); 730 #endif 731 732 log_init(NULL, 0, NULL); 733 log_ident_set(strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]); 734 /* parse the options */ 735 while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 736 switch(c) { 737 case 'c': 738 cfgfile = optarg; 739 #ifdef UB_ON_WINDOWS 740 cmdline_cfg = 1; 741 #endif 742 break; 743 case 'v': 744 cmdline_verbose ++; 745 verbosity++; 746 break; 747 case 'd': 748 debug_mode++; 749 break; 750 case 'w': 751 winopt = optarg; 752 break; 753 case '?': 754 case 'h': 755 default: 756 usage(); 757 return 1; 758 } 759 } 760 argc -= optind; 761 argv += optind; 762 763 if(winopt) { 764 #ifdef UB_ON_WINDOWS 765 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 766 cmdline_cfg); 767 #else 768 fatal_exit("option not supported"); 769 #endif 770 } 771 772 if(argc != 0) { 773 usage(); 774 return 1; 775 } 776 777 run_daemon(cfgfile, cmdline_verbose, debug_mode); 778 log_init(NULL, 0, NULL); /* close logfile */ 779 return 0; 780 } 781