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 #include <openssl/ssl.h> 71 72 #ifndef S_SPLINT_S 73 /* splint chokes on this system header file */ 74 #ifdef HAVE_SYS_RESOURCE_H 75 #include <sys/resource.h> 76 #endif 77 #endif /* S_SPLINT_S */ 78 #ifdef HAVE_LOGIN_CAP_H 79 #include <login_cap.h> 80 #endif 81 82 #ifdef UB_ON_WINDOWS 83 # include "winrc/win_svc.h" 84 #endif 85 86 #ifdef HAVE_NSS 87 /* nss3 */ 88 # include "nss.h" 89 #endif 90 91 /** print build options. */ 92 static void 93 print_build_options(void) 94 { 95 const char** m; 96 const char *evnm="event", *evsys="", *evmethod=""; 97 time_t t; 98 struct timeval now; 99 struct ub_event_base* base; 100 printf("Version %s\n\n", PACKAGE_VERSION); 101 printf("Configure line: %s\n", CONFCMDLINE); 102 base = ub_default_event_base(0,&t,&now); 103 ub_get_event_sys(base, &evnm, &evsys, &evmethod); 104 printf("Linked libs: %s %s (it uses %s), %s\n", 105 evnm, evsys, evmethod, 106 #ifdef HAVE_SSL 107 # ifdef SSLEAY_VERSION 108 SSLeay_version(SSLEAY_VERSION) 109 # else 110 OpenSSL_version(OPENSSL_VERSION) 111 # endif 112 #elif defined(HAVE_NSS) 113 NSS_GetVersion() 114 #elif defined(HAVE_NETTLE) 115 "nettle" 116 #endif 117 ); 118 printf("Linked modules:"); 119 for(m = module_list_avail(); *m; m++) 120 printf(" %s", *m); 121 printf("\n"); 122 #ifdef USE_DNSCRYPT 123 printf("DNSCrypt feature available\n"); 124 #endif 125 #ifdef USE_TCP_FASTOPEN 126 printf("TCP Fastopen feature available\n"); 127 #endif 128 ub_event_base_free(base); 129 printf("\nBSD licensed, see LICENSE in source package for details.\n"); 130 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 131 } 132 133 /** print usage. */ 134 static void 135 usage(void) 136 { 137 printf("usage: unbound [options]\n"); 138 printf(" start unbound daemon DNS resolver.\n"); 139 printf("-h this help.\n"); 140 printf("-c file config file to read instead of %s\n", CONFIGFILE); 141 printf(" file format is described in unbound.conf(5).\n"); 142 printf("-d do not fork into the background.\n"); 143 printf("-p do not create a pidfile.\n"); 144 printf("-v verbose (more times to increase verbosity).\n"); 145 printf("-V show version number and build options.\n"); 146 #ifdef UB_ON_WINDOWS 147 printf("-w opt windows option: \n"); 148 printf(" install, remove - manage the services entry\n"); 149 printf(" service - used to start from services control panel\n"); 150 #endif 151 printf("\nVersion %s\n", PACKAGE_VERSION); 152 printf("BSD licensed, see LICENSE in source package for details.\n"); 153 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 154 } 155 156 #ifndef unbound_testbound 157 int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 158 { 159 log_assert(0); 160 return 0; 161 } 162 #endif 163 164 /** check file descriptor count */ 165 static void 166 checkrlimits(struct config_file* cfg) 167 { 168 #ifndef S_SPLINT_S 169 #ifdef HAVE_GETRLIMIT 170 /* list has number of ports to listen to, ifs number addresses */ 171 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 172 (int)cfg->incoming_num_tcp:0)); 173 size_t listen_ifs = (size_t)(cfg->num_ifs==0? 174 ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 175 (cfg->do_ip6?1:0)):cfg->num_ifs); 176 size_t listen_num = list*listen_ifs; 177 size_t outudpnum = (size_t)cfg->outgoing_num_ports; 178 size_t outtcpnum = cfg->outgoing_num_tcp; 179 size_t misc = 4; /* logfile, pidfile, stdout... */ 180 size_t perthread_noudp = listen_num + outtcpnum + 181 2/*cmdpipe*/ + 2/*libevent*/ + misc; 182 size_t perthread = perthread_noudp + outudpnum; 183 184 #if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 185 int numthread = 1; /* it forks */ 186 #else 187 int numthread = (cfg->num_threads?cfg->num_threads:1); 188 #endif 189 size_t total = numthread * perthread + misc; 190 size_t avail; 191 struct rlimit rlim; 192 193 if(total > 1024 && 194 strncmp(ub_event_get_version(), "mini-event", 10) == 0) { 195 log_warn("too many file descriptors requested. The builtin" 196 "mini-event cannot handle more than 1024. Config " 197 "for less fds or compile with libevent"); 198 if(numthread*perthread_noudp+15 > 1024) 199 fatal_exit("too much tcp. not enough fds."); 200 cfg->outgoing_num_ports = (int)((1024 201 - numthread*perthread_noudp 202 - 10 /* safety margin */) /numthread); 203 log_warn("continuing with less udp ports: %u", 204 cfg->outgoing_num_ports); 205 total = 1024; 206 } 207 if(perthread > 64 && 208 strncmp(ub_event_get_version(), "winsock-event", 13) == 0) { 209 log_err("too many file descriptors requested. The winsock" 210 " event handler cannot handle more than 64 per " 211 " thread. Config for less fds"); 212 if(perthread_noudp+2 > 64) 213 fatal_exit("too much tcp. not enough fds."); 214 cfg->outgoing_num_ports = (int)((64 215 - perthread_noudp 216 - 2/* safety margin */)); 217 log_warn("continuing with less udp ports: %u", 218 cfg->outgoing_num_ports); 219 total = numthread*(perthread_noudp+ 220 (size_t)cfg->outgoing_num_ports)+misc; 221 } 222 if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 223 log_warn("getrlimit: %s", strerror(errno)); 224 return; 225 } 226 if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 227 return; 228 if((size_t)rlim.rlim_cur < total) { 229 avail = (size_t)rlim.rlim_cur; 230 rlim.rlim_cur = (rlim_t)(total + 10); 231 rlim.rlim_max = (rlim_t)(total + 10); 232 #ifdef HAVE_SETRLIMIT 233 if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 234 log_warn("setrlimit: %s", strerror(errno)); 235 #endif 236 log_warn("cannot increase max open fds from %u to %u", 237 (unsigned)avail, (unsigned)total+10); 238 /* check that calculation below does not underflow, 239 * with 15 as margin */ 240 if(numthread*perthread_noudp+15 > avail) 241 fatal_exit("too much tcp. not enough fds."); 242 cfg->outgoing_num_ports = (int)((avail 243 - numthread*perthread_noudp 244 - 10 /* safety margin */) /numthread); 245 log_warn("continuing with less udp ports: %u", 246 cfg->outgoing_num_ports); 247 log_warn("increase ulimit or decrease threads, " 248 "ports in config to remove this warning"); 249 return; 250 #ifdef HAVE_SETRLIMIT 251 } 252 #endif 253 verbose(VERB_ALGO, "increased limit(open files) from %u to %u", 254 (unsigned)avail, (unsigned)total+10); 255 } 256 #else 257 (void)cfg; 258 #endif /* HAVE_GETRLIMIT */ 259 #endif /* S_SPLINT_S */ 260 } 261 262 /** set verbosity, check rlimits, cache settings */ 263 static void 264 apply_settings(struct daemon* daemon, struct config_file* cfg, 265 int cmdline_verbose, int debug_mode) 266 { 267 /* apply if they have changed */ 268 verbosity = cmdline_verbose + cfg->verbosity; 269 if (debug_mode > 1) { 270 cfg->use_syslog = 0; 271 free(cfg->logfile); 272 cfg->logfile = NULL; 273 } 274 daemon_apply_cfg(daemon, cfg); 275 checkrlimits(cfg); 276 277 if (cfg->use_systemd && cfg->do_daemonize) { 278 log_warn("use-systemd and do-daemonize should not be enabled at the same time"); 279 } 280 281 log_ident_set_or_default(cfg->log_identity); 282 } 283 284 #ifdef HAVE_KILL 285 /** Read existing pid from pidfile. 286 * @param file: file name of pid file. 287 * @return: the pid from the file or -1 if none. 288 */ 289 static pid_t 290 readpid (const char* file) 291 { 292 int fd; 293 pid_t pid; 294 char pidbuf[32]; 295 char* t; 296 ssize_t l; 297 298 if ((fd = open(file, O_RDONLY)) == -1) { 299 if(errno != ENOENT) 300 log_err("Could not read pidfile %s: %s", 301 file, strerror(errno)); 302 return -1; 303 } 304 305 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 306 if(errno != ENOENT) 307 log_err("Could not read pidfile %s: %s", 308 file, strerror(errno)); 309 close(fd); 310 return -1; 311 } 312 313 close(fd); 314 315 /* Empty pidfile means no pidfile... */ 316 if (l == 0) { 317 return -1; 318 } 319 320 pidbuf[sizeof(pidbuf)-1] = 0; 321 pid = (pid_t)strtol(pidbuf, &t, 10); 322 323 if (*t && *t != '\n') { 324 return -1; 325 } 326 return pid; 327 } 328 329 /** write pid to file. 330 * @param pidfile: file name of pid file. 331 * @param pid: pid to write to file. 332 */ 333 static void 334 writepid (const char* pidfile, pid_t pid) 335 { 336 FILE* f; 337 338 if ((f = fopen(pidfile, "w")) == NULL ) { 339 log_err("cannot open pidfile %s: %s", 340 pidfile, strerror(errno)); 341 return; 342 } 343 if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 344 log_err("cannot write to pidfile %s: %s", 345 pidfile, strerror(errno)); 346 } 347 fclose(f); 348 } 349 350 /** 351 * check old pid file. 352 * @param pidfile: the file name of the pid file. 353 * @param inchroot: if pidfile is inchroot and we can thus expect to 354 * be able to delete it. 355 */ 356 static void 357 checkoldpid(char* pidfile, int inchroot) 358 { 359 pid_t old; 360 if((old = readpid(pidfile)) != -1) { 361 /* see if it is still alive */ 362 if(kill(old, 0) == 0 || errno == EPERM) 363 log_warn("unbound is already running as pid %u.", 364 (unsigned)old); 365 else if(inchroot) 366 log_warn("did not exit gracefully last time (%u)", 367 (unsigned)old); 368 } 369 } 370 #endif /* HAVE_KILL */ 371 372 /** detach from command line */ 373 static void 374 detach(void) 375 { 376 #if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 377 /* use POSIX daemon(3) function */ 378 if(daemon(1, 0) != 0) 379 fatal_exit("daemon failed: %s", strerror(errno)); 380 #else /* no HAVE_DAEMON */ 381 #ifdef HAVE_FORK 382 int fd; 383 /* Take off... */ 384 switch (fork()) { 385 case 0: 386 break; 387 case -1: 388 fatal_exit("fork failed: %s", strerror(errno)); 389 default: 390 /* exit interactive session */ 391 exit(0); 392 } 393 /* detach */ 394 #ifdef HAVE_SETSID 395 if(setsid() == -1) 396 fatal_exit("setsid() failed: %s", strerror(errno)); 397 #endif 398 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 399 (void)dup2(fd, STDIN_FILENO); 400 (void)dup2(fd, STDOUT_FILENO); 401 (void)dup2(fd, STDERR_FILENO); 402 if (fd > 2) 403 (void)close(fd); 404 } 405 #endif /* HAVE_FORK */ 406 #endif /* HAVE_DAEMON */ 407 } 408 409 /** daemonize, drop user privileges and chroot if needed */ 410 static void 411 perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 412 const char** cfgfile, int need_pidfile) 413 { 414 #ifdef HAVE_KILL 415 int pidinchroot; 416 #endif 417 #ifdef HAVE_GETPWNAM 418 struct passwd *pwd = NULL; 419 420 if(cfg->username && cfg->username[0]) { 421 if((pwd = getpwnam(cfg->username)) == NULL) 422 fatal_exit("user '%s' does not exist.", cfg->username); 423 /* endpwent below, in case we need pwd for setusercontext */ 424 } 425 #endif 426 #ifdef UB_ON_WINDOWS 427 w_config_adjust_directory(cfg); 428 #endif 429 430 /* read ssl keys while superuser and outside chroot */ 431 #ifdef HAVE_SSL 432 if(!(daemon->rc = daemon_remote_create(cfg))) 433 fatal_exit("could not set up remote-control"); 434 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 435 if(!(daemon->listen_sslctx = listen_sslctx_create( 436 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 437 fatal_exit("could not set up listen SSL_CTX"); 438 if(cfg->tls_ciphers && cfg->tls_ciphers[0]) { 439 if (!SSL_CTX_set_cipher_list(daemon->listen_sslctx, cfg->tls_ciphers)) { 440 fatal_exit("failed to set tls-cipher %s", cfg->tls_ciphers); 441 } 442 } 443 #ifdef HAVE_SSL_CTX_SET_CIPHERSUITES 444 if(cfg->tls_ciphersuites && cfg->tls_ciphersuites[0]) { 445 if (!SSL_CTX_set_ciphersuites(daemon->listen_sslctx, cfg->tls_ciphersuites)) { 446 fatal_exit("failed to set tls-ciphersuites %s", cfg->tls_ciphersuites); 447 } 448 } 449 #endif 450 if(cfg->tls_session_ticket_keys.first && 451 cfg->tls_session_ticket_keys.first->str[0] != 0) { 452 if(!listen_sslctx_setup_ticket_keys(daemon->listen_sslctx, cfg->tls_session_ticket_keys.first)) { 453 fatal_exit("could not set session ticket SSL_CTX"); 454 } 455 } 456 } 457 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, 458 cfg->tls_cert_bundle, cfg->tls_win_cert))) 459 fatal_exit("could not set up connect SSL_CTX"); 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 #ifdef HAVE_KILL 474 /* true if pidfile is inside chrootdir, or nochroot */ 475 pidinchroot = need_pidfile && (!(cfg->chrootdir && cfg->chrootdir[0]) || 476 (cfg->chrootdir && cfg->chrootdir[0] && 477 strncmp(cfg->pidfile, cfg->chrootdir, 478 strlen(cfg->chrootdir))==0)); 479 480 /* check old pid file before forking */ 481 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 482 /* calculate position of pidfile */ 483 if(cfg->pidfile[0] == '/') 484 daemon->pidfile = strdup(cfg->pidfile); 485 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 486 cfg, 1); 487 if(!daemon->pidfile) 488 fatal_exit("pidfile alloc: out of memory"); 489 checkoldpid(daemon->pidfile, pidinchroot); 490 } 491 #endif 492 493 /* daemonize because pid is needed by the writepid func */ 494 if(!debug_mode && cfg->do_daemonize) { 495 detach(); 496 } 497 498 /* write new pidfile (while still root, so can be outside chroot) */ 499 #ifdef HAVE_KILL 500 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 501 writepid(daemon->pidfile, getpid()); 502 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1 && 503 pidinchroot) { 504 # ifdef HAVE_CHOWN 505 if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) { 506 verbose(VERB_QUERY, "cannot chown %u.%u %s: %s", 507 (unsigned)cfg_uid, (unsigned)cfg_gid, 508 daemon->pidfile, strerror(errno)); 509 } 510 # endif /* HAVE_CHOWN */ 511 } 512 } 513 #else 514 (void)daemon; 515 (void)need_pidfile; 516 #endif /* HAVE_KILL */ 517 518 /* Set user context */ 519 #ifdef HAVE_GETPWNAM 520 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 521 #ifdef HAVE_SETUSERCONTEXT 522 /* setusercontext does initgroups, setuid, setgid, and 523 * also resource limits from login config, but we 524 * still call setresuid, setresgid to be sure to set all uid*/ 525 if(setusercontext(NULL, pwd, cfg_uid, (unsigned) 526 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 527 log_warn("unable to setusercontext %s: %s", 528 cfg->username, strerror(errno)); 529 #endif /* HAVE_SETUSERCONTEXT */ 530 } 531 #endif /* HAVE_GETPWNAM */ 532 533 /* box into the chroot */ 534 #ifdef HAVE_CHROOT 535 if(cfg->chrootdir && cfg->chrootdir[0]) { 536 if(chdir(cfg->chrootdir)) { 537 fatal_exit("unable to chdir to chroot %s: %s", 538 cfg->chrootdir, strerror(errno)); 539 } 540 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 541 if(chroot(cfg->chrootdir)) 542 fatal_exit("unable to chroot to %s: %s", 543 cfg->chrootdir, strerror(errno)); 544 if(chdir("/")) 545 fatal_exit("unable to chdir to / in chroot %s: %s", 546 cfg->chrootdir, strerror(errno)); 547 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 548 if(strncmp(*cfgfile, cfg->chrootdir, 549 strlen(cfg->chrootdir)) == 0) 550 (*cfgfile) += strlen(cfg->chrootdir); 551 552 /* adjust stored pidfile for chroot */ 553 if(daemon->pidfile && daemon->pidfile[0] && 554 strncmp(daemon->pidfile, cfg->chrootdir, 555 strlen(cfg->chrootdir))==0) { 556 char* old = daemon->pidfile; 557 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 558 free(old); 559 if(!daemon->pidfile) 560 log_err("out of memory in pidfile adjust"); 561 } 562 daemon->chroot = strdup(cfg->chrootdir); 563 if(!daemon->chroot) 564 log_err("out of memory in daemon chroot dir storage"); 565 } 566 #else 567 (void)cfgfile; 568 #endif 569 /* change to working directory inside chroot */ 570 if(cfg->directory && cfg->directory[0]) { 571 char* dir = cfg->directory; 572 if(cfg->chrootdir && cfg->chrootdir[0] && 573 strncmp(dir, cfg->chrootdir, 574 strlen(cfg->chrootdir)) == 0) 575 dir += strlen(cfg->chrootdir); 576 if(dir[0]) { 577 if(chdir(dir)) { 578 fatal_exit("Could not chdir to %s: %s", 579 dir, strerror(errno)); 580 } 581 verbose(VERB_QUERY, "chdir to %s", dir); 582 } 583 } 584 585 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 586 #ifdef HAVE_GETPWNAM 587 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 588 # ifdef HAVE_INITGROUPS 589 if(initgroups(cfg->username, cfg_gid) != 0) 590 log_warn("unable to initgroups %s: %s", 591 cfg->username, strerror(errno)); 592 # endif /* HAVE_INITGROUPS */ 593 # ifdef HAVE_ENDPWENT 594 endpwent(); 595 # endif 596 597 #ifdef HAVE_SETRESGID 598 if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0) 599 #elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 600 if(setregid(cfg_gid,cfg_gid) != 0) 601 #else /* use setgid */ 602 if(setgid(cfg_gid) != 0) 603 #endif /* HAVE_SETRESGID */ 604 fatal_exit("unable to set group id of %s: %s", 605 cfg->username, strerror(errno)); 606 #ifdef HAVE_SETRESUID 607 if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0) 608 #elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 609 if(setreuid(cfg_uid,cfg_uid) != 0) 610 #else /* use setuid */ 611 if(setuid(cfg_uid) != 0) 612 #endif /* HAVE_SETRESUID */ 613 fatal_exit("unable to set user id of %s: %s", 614 cfg->username, strerror(errno)); 615 verbose(VERB_QUERY, "drop user privileges, run as %s", 616 cfg->username); 617 } 618 #endif /* HAVE_GETPWNAM */ 619 /* file logging inited after chroot,chdir,setuid is done so that 620 * it would succeed on SIGHUP as well */ 621 if(!cfg->use_syslog) 622 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 623 } 624 625 /** 626 * Run the daemon. 627 * @param cfgfile: the config file name. 628 * @param cmdline_verbose: verbosity resulting from commandline -v. 629 * These increase verbosity as specified in the config file. 630 * @param debug_mode: if set, do not daemonize. 631 * @param need_pidfile: if false, no pidfile is checked or created. 632 */ 633 static void 634 run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode, int need_pidfile) 635 { 636 struct config_file* cfg = NULL; 637 struct daemon* daemon = NULL; 638 int done_setup = 0; 639 640 if(!(daemon = daemon_init())) 641 fatal_exit("alloc failure"); 642 while(!daemon->need_to_exit) { 643 if(done_setup) 644 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 645 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 646 647 /* config stuff */ 648 if(!(cfg = config_create())) 649 fatal_exit("Could not alloc config defaults"); 650 if(!config_read(cfg, cfgfile, daemon->chroot)) { 651 if(errno != ENOENT) 652 fatal_exit("Could not read config file: %s." 653 " Maybe try unbound -dd, it stays on " 654 "the commandline to see more errors, " 655 "or unbound-checkconf", cfgfile); 656 log_warn("Continuing with default config settings"); 657 } 658 apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 659 if(!done_setup) 660 config_lookup_uid(cfg); 661 662 /* prepare */ 663 if(!daemon_open_shared_ports(daemon)) 664 fatal_exit("could not open ports"); 665 if(!done_setup) { 666 perform_setup(daemon, cfg, debug_mode, &cfgfile, need_pidfile); 667 done_setup = 1; 668 } else { 669 /* reopen log after HUP to facilitate log rotation */ 670 if(!cfg->use_syslog) 671 log_init(cfg->logfile, 0, cfg->chrootdir); 672 } 673 /* work */ 674 daemon_fork(daemon); 675 676 /* clean up for restart */ 677 verbose(VERB_ALGO, "cleanup."); 678 daemon_cleanup(daemon); 679 config_delete(cfg); 680 } 681 verbose(VERB_ALGO, "Exit cleanup."); 682 /* this unlink may not work if the pidfile is located outside 683 * of the chroot/workdir or we no longer have permissions */ 684 if(daemon->pidfile) { 685 int fd; 686 /* truncate pidfile */ 687 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 688 if(fd != -1) 689 close(fd); 690 /* delete pidfile */ 691 unlink(daemon->pidfile); 692 } 693 daemon_delete(daemon); 694 } 695 696 /** getopt global, in case header files fail to declare it. */ 697 extern int optind; 698 /** getopt global, in case header files fail to declare it. */ 699 extern char* optarg; 700 701 /** 702 * main program. Set options given commandline arguments. 703 * @param argc: number of commandline arguments. 704 * @param argv: array of commandline arguments. 705 * @return: exit status of the program. 706 */ 707 int 708 main(int argc, char* argv[]) 709 { 710 int c; 711 const char* cfgfile = CONFIGFILE; 712 const char* winopt = NULL; 713 const char* log_ident_default; 714 int cmdline_verbose = 0; 715 int debug_mode = 0; 716 int need_pidfile = 1; 717 718 #ifdef UB_ON_WINDOWS 719 int cmdline_cfg = 0; 720 #endif 721 722 log_init(NULL, 0, NULL); 723 log_ident_default = strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]; 724 log_ident_set_default(log_ident_default); 725 log_ident_set(log_ident_default); 726 /* parse the options */ 727 while( (c=getopt(argc, argv, "c:dhpvw:V")) != -1) { 728 switch(c) { 729 case 'c': 730 cfgfile = optarg; 731 #ifdef UB_ON_WINDOWS 732 cmdline_cfg = 1; 733 #endif 734 break; 735 case 'v': 736 cmdline_verbose++; 737 verbosity++; 738 break; 739 case 'p': 740 need_pidfile = 0; 741 break; 742 case 'd': 743 debug_mode++; 744 break; 745 case 'w': 746 winopt = optarg; 747 break; 748 case 'V': 749 print_build_options(); 750 return 0; 751 case '?': 752 case 'h': 753 default: 754 usage(); 755 return 1; 756 } 757 } 758 argc -= optind; 759 /* argv += optind; not using further arguments */ 760 761 if(winopt) { 762 #ifdef UB_ON_WINDOWS 763 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 764 cmdline_cfg); 765 #else 766 fatal_exit("option not supported"); 767 #endif 768 } 769 770 if(argc != 0) { 771 usage(); 772 return 1; 773 } 774 775 run_daemon(cfgfile, cmdline_verbose, debug_mode, need_pidfile); 776 log_init(NULL, 0, NULL); /* close logfile */ 777 #ifndef unbound_testbound 778 if(log_get_lock()) { 779 lock_basic_destroy((lock_basic_type*)log_get_lock()); 780 } 781 #endif 782 return 0; 783 } 784