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#ifdef HAVE_TARGETCONDITIONALS_H 92#include <TargetConditionals.h> 93#endif 94 95#if (defined(TARGET_OS_TV) && TARGET_OS_TV) || (defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) 96#undef HAVE_FORK 97#endif 98 99/** print build options. */ 100static void 101print_build_options(void) 102{ 103 const char** m; 104 const char *evnm="event", *evsys="", *evmethod=""; 105 time_t t; 106 struct timeval now; 107 struct ub_event_base* base; 108 printf("Version %s\n\n", PACKAGE_VERSION); 109 printf("Configure line: %s\n", CONFCMDLINE); 110 base = ub_default_event_base(0,&t,&now); 111 ub_get_event_sys(base, &evnm, &evsys, &evmethod); 112 printf("Linked libs: %s %s (it uses %s), %s\n", 113 evnm, evsys, evmethod, 114#ifdef HAVE_SSL 115# ifdef SSLEAY_VERSION 116 SSLeay_version(SSLEAY_VERSION) 117# else 118 OpenSSL_version(OPENSSL_VERSION) 119# endif 120#elif defined(HAVE_NSS) 121 NSS_GetVersion() 122#elif defined(HAVE_NETTLE) 123 "nettle" 124#endif 125 ); 126 printf("Linked modules:"); 127 for(m = module_list_avail(); *m; m++) 128 printf(" %s", *m); 129 printf("\n"); 130#ifdef USE_DNSCRYPT 131 printf("DNSCrypt feature available\n"); 132#endif 133#ifdef USE_TCP_FASTOPEN 134 printf("TCP Fastopen feature available\n"); 135#endif 136 ub_event_base_free(base); 137 printf("\nBSD licensed, see LICENSE in source package for details.\n"); 138 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 139} 140 141/** print usage. */ 142static void 143usage(void) 144{ 145 printf("usage: unbound [options]\n"); 146 printf(" start unbound daemon DNS resolver.\n"); 147 printf("-h this help.\n"); 148 printf("-c file config file to read instead of %s\n", CONFIGFILE); 149 printf(" file format is described in unbound.conf(5).\n"); 150 printf("-d do not fork into the background.\n"); 151 printf("-p do not create a pidfile.\n"); 152 printf("-v verbose (more times to increase verbosity).\n"); 153 printf("-V show version number and build options.\n"); 154#ifdef UB_ON_WINDOWS 155 printf("-w opt windows option: \n"); 156 printf(" install, remove - manage the services entry\n"); 157 printf(" service - used to start from services control panel\n"); 158#endif 159 printf("\nVersion %s\n", PACKAGE_VERSION); 160 printf("BSD licensed, see LICENSE in source package for details.\n"); 161 printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 162} 163 164#ifndef unbound_testbound 165int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 166{ 167 log_assert(0); 168 return 0; 169} 170#endif 171 172/** check file descriptor count */ 173static void 174checkrlimits(struct config_file* cfg) 175{ 176#ifndef S_SPLINT_S 177#ifdef HAVE_GETRLIMIT 178 /* list has number of ports to listen to, ifs number addresses */ 179 int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 180 (int)cfg->incoming_num_tcp:0)); 181 size_t listen_ifs = (size_t)(cfg->num_ifs==0? 182 ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 183 (cfg->do_ip6?1:0)):cfg->num_ifs); 184 size_t listen_num = list*listen_ifs; 185 size_t outudpnum = (size_t)cfg->outgoing_num_ports; 186 size_t outtcpnum = cfg->outgoing_num_tcp; 187 size_t misc = 4; /* logfile, pidfile, stdout... */ 188 size_t perthread_noudp = listen_num + outtcpnum + 189 2/*cmdpipe*/ + 2/*libevent*/ + misc; 190 size_t perthread = perthread_noudp + outudpnum; 191 192#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 193 int numthread = 1; /* it forks */ 194#else 195 int numthread = (cfg->num_threads?cfg->num_threads:1); 196#endif 197 size_t total = numthread * perthread + misc; 198 size_t avail; 199 struct rlimit rlim; 200 size_t memsize_expect = cfg->msg_cache_size + cfg->rrset_cache_size 201 + (cfg->do_tcp?cfg->stream_wait_size:0) 202 + (cfg->ip_ratelimit?cfg->ip_ratelimit_size:0) 203 + (cfg->ratelimit?cfg->ratelimit_size:0) 204 + (cfg->dnscrypt?cfg->dnscrypt_shared_secret_cache_size + cfg->dnscrypt_nonce_cache_size:0) 205 + cfg->infra_cache_numhosts * (sizeof(struct infra_key)+sizeof(struct infra_data)); 206 if(strstr(cfg->module_conf, "validator") && (cfg->trust_anchor_file_list || cfg->trust_anchor_list || cfg->auto_trust_anchor_file_list || cfg->trusted_keys_file_list)) { 207 memsize_expect += cfg->key_cache_size + cfg->neg_cache_size; 208 } 209#ifdef HAVE_NGHTTP2_NGHTTP2_H 210 if(cfg_has_https(cfg)) { 211 memsize_expect += cfg->http_query_buffer_size + cfg->http_response_buffer_size; 212 } 213#endif 214 215#ifdef RLIMIT_AS 216 if(getrlimit(RLIMIT_AS, &rlim) == 0) { 217 if(rlim.rlim_cur != (rlim_t)RLIM_INFINITY && 218 rlim.rlim_cur < (rlim_t)memsize_expect) { 219 log_warn("the ulimit(max memory size) is smaller than the expected memory usage (added size of caches). %u < %u bytes", (unsigned)rlim.rlim_cur, (unsigned)memsize_expect); 220 } 221 } 222#endif 223 if(getrlimit(RLIMIT_DATA, &rlim) == 0) { 224 if(rlim.rlim_cur != (rlim_t)RLIM_INFINITY && 225 rlim.rlim_cur < (rlim_t)memsize_expect) { 226 log_warn("the ulimit(data seg size) is smaller than the expected memory usage (added size of caches). %u < %u bytes", (unsigned)rlim.rlim_cur, (unsigned)memsize_expect); 227 } 228 } 229 230 if(total > 1024 && 231 strncmp(ub_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(ub_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 */ 300static void 301apply_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 free(cfg->logfile); 309 cfg->logfile = NULL; 310 } 311 daemon_apply_cfg(daemon, cfg); 312 checkrlimits(cfg); 313 314 if (cfg->use_systemd && cfg->do_daemonize) { 315 log_warn("use-systemd and do-daemonize should not be enabled at the same time"); 316 } 317 318 log_ident_set_or_default(cfg->log_identity); 319} 320 321#ifdef HAVE_KILL 322/** Read existing pid from pidfile. 323 * @param file: file name of pid file. 324 * @return: the pid from the file or -1 if none. 325 */ 326static pid_t 327readpid (const char* file) 328{ 329 int fd; 330 pid_t pid; 331 char pidbuf[32]; 332 char* t; 333 ssize_t l; 334 335 if ((fd = open(file, O_RDONLY)) == -1) { 336 if(errno != ENOENT) 337 log_err("Could not read pidfile %s: %s", 338 file, strerror(errno)); 339 return -1; 340 } 341 342 if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 343 if(errno != ENOENT) 344 log_err("Could not read pidfile %s: %s", 345 file, strerror(errno)); 346 close(fd); 347 return -1; 348 } 349 350 close(fd); 351 352 /* Empty pidfile means no pidfile... */ 353 if (l == 0) { 354 return -1; 355 } 356 357 pidbuf[sizeof(pidbuf)-1] = 0; 358 pid = (pid_t)strtol(pidbuf, &t, 10); 359 360 if (*t && *t != '\n') { 361 return -1; 362 } 363 return pid; 364} 365 366/** write pid to file. 367 * @param pidfile: file name of pid file. 368 * @param pid: pid to write to file. 369 * @return false on failure 370 */ 371static int 372writepid (const char* pidfile, pid_t pid) 373{ 374 int fd; 375 char pidbuf[32]; 376 size_t count = 0; 377 snprintf(pidbuf, sizeof(pidbuf), "%lu\n", (unsigned long)pid); 378 379 if((fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC 380#ifdef O_NOFOLLOW 381 | O_NOFOLLOW 382#endif 383 , 0644)) == -1) { 384 log_err("cannot open pidfile %s: %s", 385 pidfile, strerror(errno)); 386 return 0; 387 } 388 while(count < strlen(pidbuf)) { 389 ssize_t r = write(fd, pidbuf+count, strlen(pidbuf)-count); 390 if(r == -1) { 391 if(errno == EAGAIN || errno == EINTR) 392 continue; 393 log_err("cannot write to pidfile %s: %s", 394 pidfile, strerror(errno)); 395 close(fd); 396 return 0; 397 } else if(r == 0) { 398 log_err("cannot write any bytes to pidfile %s: " 399 "write returns 0 bytes written", pidfile); 400 close(fd); 401 return 0; 402 } 403 count += r; 404 } 405 close(fd); 406 return 1; 407} 408 409/** 410 * check old pid file. 411 * @param pidfile: the file name of the pid file. 412 * @param inchroot: if pidfile is inchroot and we can thus expect to 413 * be able to delete it. 414 */ 415static void 416checkoldpid(char* pidfile, int inchroot) 417{ 418 pid_t old; 419 if((old = readpid(pidfile)) != -1) { 420 /* see if it is still alive */ 421 if(kill(old, 0) == 0 || errno == EPERM) 422 log_warn("unbound is already running as pid %u.", 423 (unsigned)old); 424 else if(inchroot) 425 log_warn("did not exit gracefully last time (%u)", 426 (unsigned)old); 427 } 428} 429#endif /* HAVE_KILL */ 430 431/** detach from command line */ 432static void 433detach(void) 434{ 435#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 436 /* use POSIX daemon(3) function */ 437 if(daemon(1, 0) != 0) 438 fatal_exit("daemon failed: %s", strerror(errno)); 439#else /* no HAVE_DAEMON */ 440#ifdef HAVE_FORK 441 int fd; 442 /* Take off... */ 443 switch (fork()) { 444 case 0: 445 break; 446 case -1: 447 fatal_exit("fork failed: %s", strerror(errno)); 448 default: 449 /* exit interactive session */ 450 exit(0); 451 } 452 /* detach */ 453#ifdef HAVE_SETSID 454 if(setsid() == -1) 455 fatal_exit("setsid() failed: %s", strerror(errno)); 456#endif 457 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 458 (void)dup2(fd, STDIN_FILENO); 459 (void)dup2(fd, STDOUT_FILENO); 460 (void)dup2(fd, STDERR_FILENO); 461 if (fd > 2) 462 (void)close(fd); 463 } 464#endif /* HAVE_FORK */ 465#endif /* HAVE_DAEMON */ 466} 467 468/** daemonize, drop user privileges and chroot if needed */ 469static void 470perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 471 const char** cfgfile, int need_pidfile) 472{ 473#ifdef HAVE_KILL 474 int pidinchroot; 475#endif 476#ifdef HAVE_GETPWNAM 477 struct passwd *pwd = NULL; 478 479 if(cfg->username && cfg->username[0]) { 480 if((pwd = getpwnam(cfg->username)) == NULL) 481 fatal_exit("user '%s' does not exist.", cfg->username); 482 /* endpwent below, in case we need pwd for setusercontext */ 483 } 484#endif 485#ifdef UB_ON_WINDOWS 486 w_config_adjust_directory(cfg); 487#endif 488 489 /* read ssl keys while superuser and outside chroot */ 490#ifdef HAVE_SSL 491 if(!(daemon->rc = daemon_remote_create(cfg))) 492 fatal_exit("could not set up remote-control"); 493 if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 494 if(!(daemon->listen_sslctx = listen_sslctx_create( 495 cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 496 fatal_exit("could not set up listen SSL_CTX"); 497 if(cfg->tls_ciphers && cfg->tls_ciphers[0]) { 498 if (!SSL_CTX_set_cipher_list(daemon->listen_sslctx, cfg->tls_ciphers)) { 499 fatal_exit("failed to set tls-cipher %s", cfg->tls_ciphers); 500 } 501 } 502#ifdef HAVE_SSL_CTX_SET_CIPHERSUITES 503 if(cfg->tls_ciphersuites && cfg->tls_ciphersuites[0]) { 504 if (!SSL_CTX_set_ciphersuites(daemon->listen_sslctx, cfg->tls_ciphersuites)) { 505 fatal_exit("failed to set tls-ciphersuites %s", cfg->tls_ciphersuites); 506 } 507 } 508#endif 509 if(cfg->tls_session_ticket_keys.first && 510 cfg->tls_session_ticket_keys.first->str[0] != 0) { 511 if(!listen_sslctx_setup_ticket_keys(daemon->listen_sslctx, cfg->tls_session_ticket_keys.first)) { 512 fatal_exit("could not set session ticket SSL_CTX"); 513 } 514 } 515 } 516 if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, 517 cfg->tls_cert_bundle, cfg->tls_win_cert))) 518 fatal_exit("could not set up connect SSL_CTX"); 519#endif 520 521 /* init syslog (as root) if needed, before daemonize, otherwise 522 * a fork error could not be printed since daemonize closed stderr.*/ 523 if(cfg->use_syslog) { 524 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 525 } 526 /* if using a logfile, we cannot open it because the logfile would 527 * be created with the wrong permissions, we cannot chown it because 528 * we cannot chown system logfiles, so we do not open at all. 529 * So, using a logfile, the user does not see errors unless -d is 530 * given to unbound on the commandline. */ 531 532#ifdef HAVE_KILL 533 /* true if pidfile is inside chrootdir, or nochroot */ 534 pidinchroot = need_pidfile && (!(cfg->chrootdir && cfg->chrootdir[0]) || 535 (cfg->chrootdir && cfg->chrootdir[0] && 536 strncmp(cfg->pidfile, cfg->chrootdir, 537 strlen(cfg->chrootdir))==0)); 538 539 /* check old pid file before forking */ 540 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 541 /* calculate position of pidfile */ 542 if(cfg->pidfile[0] == '/') 543 daemon->pidfile = strdup(cfg->pidfile); 544 else daemon->pidfile = fname_after_chroot(cfg->pidfile, 545 cfg, 1); 546 if(!daemon->pidfile) 547 fatal_exit("pidfile alloc: out of memory"); 548 checkoldpid(daemon->pidfile, pidinchroot); 549 } 550#endif 551 552 /* daemonize because pid is needed by the writepid func */ 553 if(!debug_mode && cfg->do_daemonize) { 554 detach(); 555 } 556 557 /* write new pidfile (while still root, so can be outside chroot) */ 558#ifdef HAVE_KILL 559 if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 560 if(writepid(daemon->pidfile, getpid())) { 561 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1 && 562 pidinchroot) { 563# ifdef HAVE_CHOWN 564 if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) { 565 verbose(VERB_QUERY, "cannot chown %u.%u %s: %s", 566 (unsigned)cfg_uid, (unsigned)cfg_gid, 567 daemon->pidfile, strerror(errno)); 568 } 569# endif /* HAVE_CHOWN */ 570 } 571 } 572 } 573#else 574 (void)daemon; 575 (void)need_pidfile; 576#endif /* HAVE_KILL */ 577 578 /* Set user context */ 579#ifdef HAVE_GETPWNAM 580 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 581#ifdef HAVE_SETUSERCONTEXT 582 /* setusercontext does initgroups, setuid, setgid, and 583 * also resource limits from login config, but we 584 * still call setresuid, setresgid to be sure to set all uid*/ 585 if(setusercontext(NULL, pwd, cfg_uid, (unsigned) 586 LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 587 log_warn("unable to setusercontext %s: %s", 588 cfg->username, strerror(errno)); 589#else 590 (void)pwd; 591#endif /* HAVE_SETUSERCONTEXT */ 592 } 593#endif /* HAVE_GETPWNAM */ 594 595 /* box into the chroot */ 596#ifdef HAVE_CHROOT 597 if(cfg->chrootdir && cfg->chrootdir[0]) { 598 if(chdir(cfg->chrootdir)) { 599 fatal_exit("unable to chdir to chroot %s: %s", 600 cfg->chrootdir, strerror(errno)); 601 } 602 verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 603 if(chroot(cfg->chrootdir)) 604 fatal_exit("unable to chroot to %s: %s", 605 cfg->chrootdir, strerror(errno)); 606 if(chdir("/")) 607 fatal_exit("unable to chdir to / in chroot %s: %s", 608 cfg->chrootdir, strerror(errno)); 609 verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 610 if(strncmp(*cfgfile, cfg->chrootdir, 611 strlen(cfg->chrootdir)) == 0) 612 (*cfgfile) += strlen(cfg->chrootdir); 613 614 /* adjust stored pidfile for chroot */ 615 if(daemon->pidfile && daemon->pidfile[0] && 616 strncmp(daemon->pidfile, cfg->chrootdir, 617 strlen(cfg->chrootdir))==0) { 618 char* old = daemon->pidfile; 619 daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 620 free(old); 621 if(!daemon->pidfile) 622 log_err("out of memory in pidfile adjust"); 623 } 624 daemon->chroot = strdup(cfg->chrootdir); 625 if(!daemon->chroot) 626 log_err("out of memory in daemon chroot dir storage"); 627 } 628#else 629 (void)cfgfile; 630#endif 631 /* change to working directory inside chroot */ 632 if(cfg->directory && cfg->directory[0]) { 633 char* dir = cfg->directory; 634 if(cfg->chrootdir && cfg->chrootdir[0] && 635 strncmp(dir, cfg->chrootdir, 636 strlen(cfg->chrootdir)) == 0) 637 dir += strlen(cfg->chrootdir); 638 if(dir[0]) { 639 if(chdir(dir)) { 640 fatal_exit("Could not chdir to %s: %s", 641 dir, strerror(errno)); 642 } 643 verbose(VERB_QUERY, "chdir to %s", dir); 644 } 645 } 646 647 /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 648#ifdef HAVE_GETPWNAM 649 if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 650# ifdef HAVE_INITGROUPS 651 if(initgroups(cfg->username, cfg_gid) != 0) 652 log_warn("unable to initgroups %s: %s", 653 cfg->username, strerror(errno)); 654# endif /* HAVE_INITGROUPS */ 655# ifdef HAVE_ENDPWENT 656 endpwent(); 657# endif 658 659#ifdef HAVE_SETRESGID 660 if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0) 661#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 662 if(setregid(cfg_gid,cfg_gid) != 0) 663#else /* use setgid */ 664 if(setgid(cfg_gid) != 0) 665#endif /* HAVE_SETRESGID */ 666 fatal_exit("unable to set group id of %s: %s", 667 cfg->username, strerror(errno)); 668#ifdef HAVE_SETRESUID 669 if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0) 670#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 671 if(setreuid(cfg_uid,cfg_uid) != 0) 672#else /* use setuid */ 673 if(setuid(cfg_uid) != 0) 674#endif /* HAVE_SETRESUID */ 675 fatal_exit("unable to set user id of %s: %s", 676 cfg->username, strerror(errno)); 677 verbose(VERB_QUERY, "drop user privileges, run as %s", 678 cfg->username); 679 } 680#endif /* HAVE_GETPWNAM */ 681 /* file logging inited after chroot,chdir,setuid is done so that 682 * it would succeed on SIGHUP as well */ 683 if(!cfg->use_syslog) 684 log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 685} 686 687/** 688 * Run the daemon. 689 * @param cfgfile: the config file name. 690 * @param cmdline_verbose: verbosity resulting from commandline -v. 691 * These increase verbosity as specified in the config file. 692 * @param debug_mode: if set, do not daemonize. 693 * @param need_pidfile: if false, no pidfile is checked or created. 694 */ 695static void 696run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode, int need_pidfile) 697{ 698 struct config_file* cfg = NULL; 699 struct daemon* daemon = NULL; 700 int done_setup = 0; 701 702 if(!(daemon = daemon_init())) 703 fatal_exit("alloc failure"); 704 while(!daemon->need_to_exit) { 705 if(done_setup) 706 verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 707 else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 708 709 /* config stuff */ 710 if(!(cfg = config_create())) 711 fatal_exit("Could not alloc config defaults"); 712 if(!config_read(cfg, cfgfile, daemon->chroot)) { 713 if(errno != ENOENT) 714 fatal_exit("Could not read config file: %s." 715 " Maybe try unbound -dd, it stays on " 716 "the commandline to see more errors, " 717 "or unbound-checkconf", cfgfile); 718 log_warn("Continuing with default config settings"); 719 } 720 apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 721 if(!done_setup) 722 config_lookup_uid(cfg); 723 724 /* prepare */ 725 if(!daemon_open_shared_ports(daemon)) 726 fatal_exit("could not open ports"); 727 if(!done_setup) { 728 perform_setup(daemon, cfg, debug_mode, &cfgfile, need_pidfile); 729 done_setup = 1; 730 } else { 731 /* reopen log after HUP to facilitate log rotation */ 732 if(!cfg->use_syslog) 733 log_init(cfg->logfile, 0, cfg->chrootdir); 734 } 735 /* work */ 736 daemon_fork(daemon); 737 738 /* clean up for restart */ 739 verbose(VERB_ALGO, "cleanup."); 740 daemon_cleanup(daemon); 741 config_delete(cfg); 742 } 743 verbose(VERB_ALGO, "Exit cleanup."); 744 /* this unlink may not work if the pidfile is located outside 745 * of the chroot/workdir or we no longer have permissions */ 746 if(daemon->pidfile) { 747 int fd; 748 /* truncate pidfile */ 749 fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 750 if(fd != -1) 751 close(fd); 752 /* delete pidfile */ 753 unlink(daemon->pidfile); 754 } 755 daemon_delete(daemon); 756} 757 758/** getopt global, in case header files fail to declare it. */ 759extern int optind; 760/** getopt global, in case header files fail to declare it. */ 761extern char* optarg; 762 763/** 764 * main program. Set options given commandline arguments. 765 * @param argc: number of commandline arguments. 766 * @param argv: array of commandline arguments. 767 * @return: exit status of the program. 768 */ 769int 770main(int argc, char* argv[]) 771{ 772 int c; 773 const char* cfgfile = CONFIGFILE; 774 const char* winopt = NULL; 775 const char* log_ident_default; 776 int cmdline_verbose = 0; 777 int debug_mode = 0; 778 int need_pidfile = 1; 779 780#ifdef UB_ON_WINDOWS 781 int cmdline_cfg = 0; 782#endif 783 784 checklock_start(); 785 log_init(NULL, 0, NULL); 786 log_ident_default = strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]; 787 log_ident_set_default(log_ident_default); 788 log_ident_set(log_ident_default); 789 /* parse the options */ 790 while( (c=getopt(argc, argv, "c:dhpvw:V")) != -1) { 791 switch(c) { 792 case 'c': 793 cfgfile = optarg; 794#ifdef UB_ON_WINDOWS 795 cmdline_cfg = 1; 796#endif 797 break; 798 case 'v': 799 cmdline_verbose++; 800 verbosity++; 801 break; 802 case 'p': 803 need_pidfile = 0; 804 break; 805 case 'd': 806 debug_mode++; 807 break; 808 case 'w': 809 winopt = optarg; 810 break; 811 case 'V': 812 print_build_options(); 813 return 0; 814 case '?': 815 case 'h': 816 default: 817 usage(); 818 return 1; 819 } 820 } 821 argc -= optind; 822 /* argv += optind; not using further arguments */ 823 824 if(winopt) { 825#ifdef UB_ON_WINDOWS 826 wsvc_command_option(winopt, cfgfile, cmdline_verbose, 827 cmdline_cfg); 828#else 829 fatal_exit("option not supported"); 830#endif 831 } 832 833 if(argc != 0) { 834 usage(); 835 return 1; 836 } 837 838 run_daemon(cfgfile, cmdline_verbose, debug_mode, need_pidfile); 839 log_init(NULL, 0, NULL); /* close logfile */ 840#ifndef unbound_testbound 841 if(log_get_lock()) { 842 lock_basic_destroy((lock_basic_type*)log_get_lock()); 843 } 844#endif 845 return 0; 846} 847