1238106Sdes/* 2238106Sdes * daemon/unbound.c - main program for unbound DNS resolver daemon. 3238106Sdes * 4238106Sdes * Copyright (c) 2007, NLnet Labs. All rights reserved. 5238106Sdes * 6238106Sdes * This software is open source. 7238106Sdes * 8238106Sdes * Redistribution and use in source and binary forms, with or without 9238106Sdes * modification, are permitted provided that the following conditions 10238106Sdes * are met: 11238106Sdes * 12238106Sdes * Redistributions of source code must retain the above copyright notice, 13238106Sdes * this list of conditions and the following disclaimer. 14238106Sdes * 15238106Sdes * Redistributions in binary form must reproduce the above copyright notice, 16238106Sdes * this list of conditions and the following disclaimer in the documentation 17238106Sdes * and/or other materials provided with the distribution. 18238106Sdes * 19238106Sdes * Neither the name of the NLNET LABS nor the names of its contributors may 20238106Sdes * be used to endorse or promote products derived from this software without 21238106Sdes * specific prior written permission. 22238106Sdes * 23238106Sdes * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24266114Sdes * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25266114Sdes * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26266114Sdes * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27266114Sdes * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28266114Sdes * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29266114Sdes * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30266114Sdes * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31266114Sdes * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32266114Sdes * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33266114Sdes * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34238106Sdes * 35238106Sdes */ 36238106Sdes 37238106Sdes/** 38238106Sdes * \file 39238106Sdes * 40238106Sdes * Main program to start the DNS resolver daemon. 41238106Sdes */ 42238106Sdes 43238106Sdes#include "config.h" 44238106Sdes#ifdef HAVE_GETOPT_H 45238106Sdes#include <getopt.h> 46238106Sdes#endif 47238106Sdes#include <sys/time.h> 48238106Sdes#include "util/log.h" 49238106Sdes#include "daemon/daemon.h" 50238106Sdes#include "daemon/remote.h" 51238106Sdes#include "util/config_file.h" 52238106Sdes#include "util/storage/slabhash.h" 53238106Sdes#include "services/listen_dnsport.h" 54238106Sdes#include "services/cache/rrset.h" 55238106Sdes#include "services/cache/infra.h" 56255579Sdes#include "util/fptr_wlist.h" 57238106Sdes#include "util/data/msgreply.h" 58238106Sdes#include "util/module.h" 59238106Sdes#include "util/net_help.h" 60307729Sdes#include "util/ub_event.h" 61238106Sdes#include <signal.h> 62238106Sdes#include <fcntl.h> 63238106Sdes#include <openssl/crypto.h> 64238106Sdes#ifdef HAVE_PWD_H 65238106Sdes#include <pwd.h> 66238106Sdes#endif 67238106Sdes#ifdef HAVE_GRP_H 68238106Sdes#include <grp.h> 69238106Sdes#endif 70356345Scy#include <openssl/ssl.h> 71238106Sdes 72266114Sdes#ifndef S_SPLINT_S 73266114Sdes/* splint chokes on this system header file */ 74238106Sdes#ifdef HAVE_SYS_RESOURCE_H 75238106Sdes#include <sys/resource.h> 76238106Sdes#endif 77266114Sdes#endif /* S_SPLINT_S */ 78238106Sdes#ifdef HAVE_LOGIN_CAP_H 79238106Sdes#include <login_cap.h> 80238106Sdes#endif 81238106Sdes 82238106Sdes#ifdef UB_ON_WINDOWS 83238106Sdes# include "winrc/win_svc.h" 84238106Sdes#endif 85238106Sdes 86249141Sdes#ifdef HAVE_NSS 87249141Sdes/* nss3 */ 88249141Sdes# include "nss.h" 89249141Sdes#endif 90249141Sdes 91366095Scy#ifdef HAVE_TARGETCONDITIONALS_H 92366095Scy#include <TargetConditionals.h> 93366095Scy#endif 94366095Scy 95368129Scy#if (defined(TARGET_OS_TV) && TARGET_OS_TV) || (defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) 96366095Scy#undef HAVE_FORK 97366095Scy#endif 98366095Scy 99356345Scy/** print build options. */ 100356345Scystatic void 101356345Scyprint_build_options(void) 102238106Sdes{ 103238106Sdes const char** m; 104238106Sdes const char *evnm="event", *evsys="", *evmethod=""; 105307729Sdes time_t t; 106307729Sdes struct timeval now; 107307729Sdes struct ub_event_base* base; 108356345Scy printf("Version %s\n\n", PACKAGE_VERSION); 109356345Scy printf("Configure line: %s\n", CONFCMDLINE); 110307729Sdes base = ub_default_event_base(0,&t,&now); 111307729Sdes ub_get_event_sys(base, &evnm, &evsys, &evmethod); 112356345Scy printf("Linked libs: %s %s (it uses %s), %s\n", 113266114Sdes evnm, evsys, evmethod, 114249141Sdes#ifdef HAVE_SSL 115307729Sdes# ifdef SSLEAY_VERSION 116249141Sdes SSLeay_version(SSLEAY_VERSION) 117307729Sdes# else 118307729Sdes OpenSSL_version(OPENSSL_VERSION) 119307729Sdes# endif 120249141Sdes#elif defined(HAVE_NSS) 121249141Sdes NSS_GetVersion() 122292206Sdes#elif defined(HAVE_NETTLE) 123292206Sdes "nettle" 124249141Sdes#endif 125249141Sdes ); 126356345Scy printf("Linked modules:"); 127238106Sdes for(m = module_list_avail(); *m; m++) 128238106Sdes printf(" %s", *m); 129238106Sdes printf("\n"); 130356345Scy#ifdef USE_DNSCRYPT 131356345Scy printf("DNSCrypt feature available\n"); 132356345Scy#endif 133356345Scy#ifdef USE_TCP_FASTOPEN 134356345Scy printf("TCP Fastopen feature available\n"); 135356345Scy#endif 136356345Scy ub_event_base_free(base); 137356345Scy printf("\nBSD licensed, see LICENSE in source package for details.\n"); 138356345Scy printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 139356345Scy} 140356345Scy 141356345Scy/** print usage. */ 142356345Scystatic void 143356345Scyusage(void) 144356345Scy{ 145356345Scy printf("usage: unbound [options]\n"); 146356345Scy printf(" start unbound daemon DNS resolver.\n"); 147356345Scy printf("-h this help.\n"); 148356345Scy printf("-c file config file to read instead of %s\n", CONFIGFILE); 149356345Scy printf(" file format is described in unbound.conf(5).\n"); 150356345Scy printf("-d do not fork into the background.\n"); 151356345Scy printf("-p do not create a pidfile.\n"); 152356345Scy printf("-v verbose (more times to increase verbosity).\n"); 153356345Scy printf("-V show version number and build options.\n"); 154356345Scy#ifdef UB_ON_WINDOWS 155356345Scy printf("-w opt windows option: \n"); 156356345Scy printf(" install, remove - manage the services entry\n"); 157356345Scy printf(" service - used to start from services control panel\n"); 158356345Scy#endif 159356345Scy printf("\nVersion %s\n", PACKAGE_VERSION); 160238106Sdes printf("BSD licensed, see LICENSE in source package for details.\n"); 161238106Sdes printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 162238106Sdes} 163238106Sdes 164238106Sdes#ifndef unbound_testbound 165238106Sdesint replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 166238106Sdes{ 167238106Sdes log_assert(0); 168238106Sdes return 0; 169238106Sdes} 170238106Sdes#endif 171238106Sdes 172238106Sdes/** check file descriptor count */ 173238106Sdesstatic void 174238106Sdescheckrlimits(struct config_file* cfg) 175238106Sdes{ 176266114Sdes#ifndef S_SPLINT_S 177238106Sdes#ifdef HAVE_GETRLIMIT 178238106Sdes /* list has number of ports to listen to, ifs number addresses */ 179238106Sdes int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 180238106Sdes (int)cfg->incoming_num_tcp:0)); 181238106Sdes size_t listen_ifs = (size_t)(cfg->num_ifs==0? 182238106Sdes ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 183238106Sdes (cfg->do_ip6?1:0)):cfg->num_ifs); 184238106Sdes size_t listen_num = list*listen_ifs; 185238106Sdes size_t outudpnum = (size_t)cfg->outgoing_num_ports; 186238106Sdes size_t outtcpnum = cfg->outgoing_num_tcp; 187238106Sdes size_t misc = 4; /* logfile, pidfile, stdout... */ 188238106Sdes size_t perthread_noudp = listen_num + outtcpnum + 189238106Sdes 2/*cmdpipe*/ + 2/*libevent*/ + misc; 190238106Sdes size_t perthread = perthread_noudp + outudpnum; 191238106Sdes 192238106Sdes#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 193238106Sdes int numthread = 1; /* it forks */ 194238106Sdes#else 195238106Sdes int numthread = (cfg->num_threads?cfg->num_threads:1); 196238106Sdes#endif 197238106Sdes size_t total = numthread * perthread + misc; 198238106Sdes size_t avail; 199238106Sdes struct rlimit rlim; 200238106Sdes 201238106Sdes if(total > 1024 && 202307729Sdes strncmp(ub_event_get_version(), "mini-event", 10) == 0) { 203238106Sdes log_warn("too many file descriptors requested. The builtin" 204238106Sdes "mini-event cannot handle more than 1024. Config " 205238106Sdes "for less fds or compile with libevent"); 206238106Sdes if(numthread*perthread_noudp+15 > 1024) 207238106Sdes fatal_exit("too much tcp. not enough fds."); 208238106Sdes cfg->outgoing_num_ports = (int)((1024 209238106Sdes - numthread*perthread_noudp 210238106Sdes - 10 /* safety margin */) /numthread); 211238106Sdes log_warn("continuing with less udp ports: %u", 212238106Sdes cfg->outgoing_num_ports); 213238106Sdes total = 1024; 214238106Sdes } 215238106Sdes if(perthread > 64 && 216307729Sdes strncmp(ub_event_get_version(), "winsock-event", 13) == 0) { 217238106Sdes log_err("too many file descriptors requested. The winsock" 218238106Sdes " event handler cannot handle more than 64 per " 219238106Sdes " thread. Config for less fds"); 220238106Sdes if(perthread_noudp+2 > 64) 221238106Sdes fatal_exit("too much tcp. not enough fds."); 222238106Sdes cfg->outgoing_num_ports = (int)((64 223238106Sdes - perthread_noudp 224238106Sdes - 2/* safety margin */)); 225238106Sdes log_warn("continuing with less udp ports: %u", 226238106Sdes cfg->outgoing_num_ports); 227238106Sdes total = numthread*(perthread_noudp+ 228238106Sdes (size_t)cfg->outgoing_num_ports)+misc; 229238106Sdes } 230238106Sdes if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 231238106Sdes log_warn("getrlimit: %s", strerror(errno)); 232238106Sdes return; 233238106Sdes } 234238106Sdes if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 235238106Sdes return; 236238106Sdes if((size_t)rlim.rlim_cur < total) { 237238106Sdes avail = (size_t)rlim.rlim_cur; 238238106Sdes rlim.rlim_cur = (rlim_t)(total + 10); 239238106Sdes rlim.rlim_max = (rlim_t)(total + 10); 240238106Sdes#ifdef HAVE_SETRLIMIT 241238106Sdes if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 242238106Sdes log_warn("setrlimit: %s", strerror(errno)); 243238106Sdes#endif 244238106Sdes log_warn("cannot increase max open fds from %u to %u", 245238106Sdes (unsigned)avail, (unsigned)total+10); 246238106Sdes /* check that calculation below does not underflow, 247238106Sdes * with 15 as margin */ 248238106Sdes if(numthread*perthread_noudp+15 > avail) 249238106Sdes fatal_exit("too much tcp. not enough fds."); 250238106Sdes cfg->outgoing_num_ports = (int)((avail 251238106Sdes - numthread*perthread_noudp 252238106Sdes - 10 /* safety margin */) /numthread); 253238106Sdes log_warn("continuing with less udp ports: %u", 254238106Sdes cfg->outgoing_num_ports); 255238106Sdes log_warn("increase ulimit or decrease threads, " 256238106Sdes "ports in config to remove this warning"); 257238106Sdes return; 258276605Sdes#ifdef HAVE_SETRLIMIT 259238106Sdes } 260276605Sdes#endif 261276605Sdes verbose(VERB_ALGO, "increased limit(open files) from %u to %u", 262238106Sdes (unsigned)avail, (unsigned)total+10); 263238106Sdes } 264238106Sdes#else 265238106Sdes (void)cfg; 266238106Sdes#endif /* HAVE_GETRLIMIT */ 267266114Sdes#endif /* S_SPLINT_S */ 268238106Sdes} 269238106Sdes 270238106Sdes/** set verbosity, check rlimits, cache settings */ 271238106Sdesstatic void 272361435Scyapply_settings(struct daemon* daemon, struct config_file* cfg, 273361435Scy int cmdline_verbose, int debug_mode) 274238106Sdes{ 275238106Sdes /* apply if they have changed */ 276238106Sdes verbosity = cmdline_verbose + cfg->verbosity; 277276605Sdes if (debug_mode > 1) { 278276605Sdes cfg->use_syslog = 0; 279356345Scy free(cfg->logfile); 280276605Sdes cfg->logfile = NULL; 281276605Sdes } 282238106Sdes daemon_apply_cfg(daemon, cfg); 283238106Sdes checkrlimits(cfg); 284356345Scy 285356345Scy if (cfg->use_systemd && cfg->do_daemonize) { 286356345Scy log_warn("use-systemd and do-daemonize should not be enabled at the same time"); 287356345Scy } 288356345Scy 289361435Scy log_ident_set_or_default(cfg->log_identity); 290238106Sdes} 291238106Sdes 292238106Sdes#ifdef HAVE_KILL 293238106Sdes/** Read existing pid from pidfile. 294238106Sdes * @param file: file name of pid file. 295238106Sdes * @return: the pid from the file or -1 if none. 296238106Sdes */ 297238106Sdesstatic pid_t 298238106Sdesreadpid (const char* file) 299238106Sdes{ 300238106Sdes int fd; 301238106Sdes pid_t pid; 302238106Sdes char pidbuf[32]; 303238106Sdes char* t; 304238106Sdes ssize_t l; 305238106Sdes 306238106Sdes if ((fd = open(file, O_RDONLY)) == -1) { 307238106Sdes if(errno != ENOENT) 308238106Sdes log_err("Could not read pidfile %s: %s", 309238106Sdes file, strerror(errno)); 310238106Sdes return -1; 311238106Sdes } 312238106Sdes 313238106Sdes if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 314238106Sdes if(errno != ENOENT) 315238106Sdes log_err("Could not read pidfile %s: %s", 316238106Sdes file, strerror(errno)); 317238106Sdes close(fd); 318238106Sdes return -1; 319238106Sdes } 320238106Sdes 321238106Sdes close(fd); 322238106Sdes 323238106Sdes /* Empty pidfile means no pidfile... */ 324238106Sdes if (l == 0) { 325238106Sdes return -1; 326238106Sdes } 327238106Sdes 328238106Sdes pidbuf[sizeof(pidbuf)-1] = 0; 329238106Sdes pid = (pid_t)strtol(pidbuf, &t, 10); 330238106Sdes 331238106Sdes if (*t && *t != '\n') { 332238106Sdes return -1; 333238106Sdes } 334238106Sdes return pid; 335238106Sdes} 336238106Sdes 337238106Sdes/** write pid to file. 338238106Sdes * @param pidfile: file name of pid file. 339238106Sdes * @param pid: pid to write to file. 340368693Scy * @return false on failure 341238106Sdes */ 342368693Scystatic int 343238106Sdeswritepid (const char* pidfile, pid_t pid) 344238106Sdes{ 345368693Scy int fd; 346368693Scy char pidbuf[32]; 347368693Scy size_t count = 0; 348368693Scy snprintf(pidbuf, sizeof(pidbuf), "%lu\n", (unsigned long)pid); 349238106Sdes 350368693Scy if((fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC 351368693Scy#ifdef O_NOFOLLOW 352368693Scy | O_NOFOLLOW 353368693Scy#endif 354368693Scy , 0644)) == -1) { 355238106Sdes log_err("cannot open pidfile %s: %s", 356238106Sdes pidfile, strerror(errno)); 357368693Scy return 0; 358238106Sdes } 359368693Scy while(count < strlen(pidbuf)) { 360368693Scy ssize_t r = write(fd, pidbuf+count, strlen(pidbuf)-count); 361368693Scy if(r == -1) { 362368693Scy if(errno == EAGAIN || errno == EINTR) 363368693Scy continue; 364368693Scy log_err("cannot write to pidfile %s: %s", 365368693Scy pidfile, strerror(errno)); 366368693Scy close(fd); 367368693Scy return 0; 368368693Scy } else if(r == 0) { 369368693Scy log_err("cannot write any bytes to pidfile %s: " 370368693Scy "write returns 0 bytes written", pidfile); 371368693Scy close(fd); 372368693Scy return 0; 373368693Scy } 374368693Scy count += r; 375238106Sdes } 376368693Scy close(fd); 377368693Scy return 1; 378238106Sdes} 379238106Sdes 380238106Sdes/** 381238106Sdes * check old pid file. 382238106Sdes * @param pidfile: the file name of the pid file. 383238106Sdes * @param inchroot: if pidfile is inchroot and we can thus expect to 384238106Sdes * be able to delete it. 385238106Sdes */ 386238106Sdesstatic void 387238106Sdescheckoldpid(char* pidfile, int inchroot) 388238106Sdes{ 389238106Sdes pid_t old; 390238106Sdes if((old = readpid(pidfile)) != -1) { 391238106Sdes /* see if it is still alive */ 392238106Sdes if(kill(old, 0) == 0 || errno == EPERM) 393238106Sdes log_warn("unbound is already running as pid %u.", 394238106Sdes (unsigned)old); 395238106Sdes else if(inchroot) 396238106Sdes log_warn("did not exit gracefully last time (%u)", 397238106Sdes (unsigned)old); 398238106Sdes } 399238106Sdes} 400238106Sdes#endif /* HAVE_KILL */ 401238106Sdes 402238106Sdes/** detach from command line */ 403238106Sdesstatic void 404238106Sdesdetach(void) 405238106Sdes{ 406238106Sdes#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 407238106Sdes /* use POSIX daemon(3) function */ 408238106Sdes if(daemon(1, 0) != 0) 409238106Sdes fatal_exit("daemon failed: %s", strerror(errno)); 410238106Sdes#else /* no HAVE_DAEMON */ 411238106Sdes#ifdef HAVE_FORK 412238106Sdes int fd; 413238106Sdes /* Take off... */ 414238106Sdes switch (fork()) { 415238106Sdes case 0: 416238106Sdes break; 417238106Sdes case -1: 418238106Sdes fatal_exit("fork failed: %s", strerror(errno)); 419238106Sdes default: 420238106Sdes /* exit interactive session */ 421238106Sdes exit(0); 422238106Sdes } 423238106Sdes /* detach */ 424238106Sdes#ifdef HAVE_SETSID 425238106Sdes if(setsid() == -1) 426238106Sdes fatal_exit("setsid() failed: %s", strerror(errno)); 427238106Sdes#endif 428238106Sdes if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 429238106Sdes (void)dup2(fd, STDIN_FILENO); 430238106Sdes (void)dup2(fd, STDOUT_FILENO); 431238106Sdes (void)dup2(fd, STDERR_FILENO); 432238106Sdes if (fd > 2) 433238106Sdes (void)close(fd); 434238106Sdes } 435238106Sdes#endif /* HAVE_FORK */ 436238106Sdes#endif /* HAVE_DAEMON */ 437238106Sdes} 438238106Sdes 439356345Scy/** daemonize, drop user privileges and chroot if needed */ 440238106Sdesstatic void 441238106Sdesperform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 442356345Scy const char** cfgfile, int need_pidfile) 443238106Sdes{ 444296415Sdes#ifdef HAVE_KILL 445296415Sdes int pidinchroot; 446296415Sdes#endif 447238106Sdes#ifdef HAVE_GETPWNAM 448238106Sdes struct passwd *pwd = NULL; 449238106Sdes 450238106Sdes if(cfg->username && cfg->username[0]) { 451238106Sdes if((pwd = getpwnam(cfg->username)) == NULL) 452238106Sdes fatal_exit("user '%s' does not exist.", cfg->username); 453238106Sdes /* endpwent below, in case we need pwd for setusercontext */ 454238106Sdes } 455238106Sdes#endif 456292206Sdes#ifdef UB_ON_WINDOWS 457292206Sdes w_config_adjust_directory(cfg); 458292206Sdes#endif 459238106Sdes 460238106Sdes /* read ssl keys while superuser and outside chroot */ 461249141Sdes#ifdef HAVE_SSL 462238106Sdes if(!(daemon->rc = daemon_remote_create(cfg))) 463238106Sdes fatal_exit("could not set up remote-control"); 464238106Sdes if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 465238106Sdes if(!(daemon->listen_sslctx = listen_sslctx_create( 466238106Sdes cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 467238106Sdes fatal_exit("could not set up listen SSL_CTX"); 468356345Scy if(cfg->tls_ciphers && cfg->tls_ciphers[0]) { 469356345Scy if (!SSL_CTX_set_cipher_list(daemon->listen_sslctx, cfg->tls_ciphers)) { 470356345Scy fatal_exit("failed to set tls-cipher %s", cfg->tls_ciphers); 471356345Scy } 472356345Scy } 473356345Scy#ifdef HAVE_SSL_CTX_SET_CIPHERSUITES 474356345Scy if(cfg->tls_ciphersuites && cfg->tls_ciphersuites[0]) { 475356345Scy if (!SSL_CTX_set_ciphersuites(daemon->listen_sslctx, cfg->tls_ciphersuites)) { 476356345Scy fatal_exit("failed to set tls-ciphersuites %s", cfg->tls_ciphersuites); 477356345Scy } 478356345Scy } 479356345Scy#endif 480356345Scy if(cfg->tls_session_ticket_keys.first && 481356345Scy cfg->tls_session_ticket_keys.first->str[0] != 0) { 482356345Scy if(!listen_sslctx_setup_ticket_keys(daemon->listen_sslctx, cfg->tls_session_ticket_keys.first)) { 483356345Scy fatal_exit("could not set session ticket SSL_CTX"); 484356345Scy } 485356345Scy } 486238106Sdes } 487356345Scy if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, 488356345Scy cfg->tls_cert_bundle, cfg->tls_win_cert))) 489238106Sdes fatal_exit("could not set up connect SSL_CTX"); 490249141Sdes#endif 491238106Sdes 492356345Scy /* init syslog (as root) if needed, before daemonize, otherwise 493356345Scy * a fork error could not be printed since daemonize closed stderr.*/ 494356345Scy if(cfg->use_syslog) { 495356345Scy log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 496356345Scy } 497356345Scy /* if using a logfile, we cannot open it because the logfile would 498356345Scy * be created with the wrong permissions, we cannot chown it because 499356345Scy * we cannot chown system logfiles, so we do not open at all. 500356345Scy * So, using a logfile, the user does not see errors unless -d is 501356345Scy * given to unbound on the commandline. */ 502356345Scy 503238106Sdes#ifdef HAVE_KILL 504296415Sdes /* true if pidfile is inside chrootdir, or nochroot */ 505356345Scy pidinchroot = need_pidfile && (!(cfg->chrootdir && cfg->chrootdir[0]) || 506296415Sdes (cfg->chrootdir && cfg->chrootdir[0] && 507296415Sdes strncmp(cfg->pidfile, cfg->chrootdir, 508356345Scy strlen(cfg->chrootdir))==0)); 509296415Sdes 510238106Sdes /* check old pid file before forking */ 511356345Scy if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 512238106Sdes /* calculate position of pidfile */ 513238106Sdes if(cfg->pidfile[0] == '/') 514238106Sdes daemon->pidfile = strdup(cfg->pidfile); 515238106Sdes else daemon->pidfile = fname_after_chroot(cfg->pidfile, 516238106Sdes cfg, 1); 517238106Sdes if(!daemon->pidfile) 518238106Sdes fatal_exit("pidfile alloc: out of memory"); 519296415Sdes checkoldpid(daemon->pidfile, pidinchroot); 520238106Sdes } 521238106Sdes#endif 522238106Sdes 523238106Sdes /* daemonize because pid is needed by the writepid func */ 524238106Sdes if(!debug_mode && cfg->do_daemonize) { 525238106Sdes detach(); 526238106Sdes } 527238106Sdes 528238106Sdes /* write new pidfile (while still root, so can be outside chroot) */ 529238106Sdes#ifdef HAVE_KILL 530356345Scy if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) { 531368693Scy if(writepid(daemon->pidfile, getpid())) { 532368693Scy if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1 && 533368693Scy pidinchroot) { 534282089Sdes# ifdef HAVE_CHOWN 535368693Scy if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) { 536368693Scy verbose(VERB_QUERY, "cannot chown %u.%u %s: %s", 537368693Scy (unsigned)cfg_uid, (unsigned)cfg_gid, 538368693Scy daemon->pidfile, strerror(errno)); 539368693Scy } 540368693Scy# endif /* HAVE_CHOWN */ 541238106Sdes } 542238106Sdes } 543238106Sdes } 544238106Sdes#else 545238106Sdes (void)daemon; 546356345Scy (void)need_pidfile; 547282089Sdes#endif /* HAVE_KILL */ 548238106Sdes 549238106Sdes /* Set user context */ 550238106Sdes#ifdef HAVE_GETPWNAM 551282089Sdes if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 552238106Sdes#ifdef HAVE_SETUSERCONTEXT 553238106Sdes /* setusercontext does initgroups, setuid, setgid, and 554238106Sdes * also resource limits from login config, but we 555238106Sdes * still call setresuid, setresgid to be sure to set all uid*/ 556282089Sdes if(setusercontext(NULL, pwd, cfg_uid, (unsigned) 557238106Sdes LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 558238106Sdes log_warn("unable to setusercontext %s: %s", 559238106Sdes cfg->username, strerror(errno)); 560366095Scy#else 561366095Scy (void)pwd; 562238106Sdes#endif /* HAVE_SETUSERCONTEXT */ 563238106Sdes } 564238106Sdes#endif /* HAVE_GETPWNAM */ 565238106Sdes 566238106Sdes /* box into the chroot */ 567238106Sdes#ifdef HAVE_CHROOT 568238106Sdes if(cfg->chrootdir && cfg->chrootdir[0]) { 569238106Sdes if(chdir(cfg->chrootdir)) { 570238106Sdes fatal_exit("unable to chdir to chroot %s: %s", 571238106Sdes cfg->chrootdir, strerror(errno)); 572238106Sdes } 573238106Sdes verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 574238106Sdes if(chroot(cfg->chrootdir)) 575238106Sdes fatal_exit("unable to chroot to %s: %s", 576238106Sdes cfg->chrootdir, strerror(errno)); 577249141Sdes if(chdir("/")) 578249141Sdes fatal_exit("unable to chdir to / in chroot %s: %s", 579249141Sdes cfg->chrootdir, strerror(errno)); 580238106Sdes verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 581238106Sdes if(strncmp(*cfgfile, cfg->chrootdir, 582238106Sdes strlen(cfg->chrootdir)) == 0) 583238106Sdes (*cfgfile) += strlen(cfg->chrootdir); 584238106Sdes 585238106Sdes /* adjust stored pidfile for chroot */ 586238106Sdes if(daemon->pidfile && daemon->pidfile[0] && 587238106Sdes strncmp(daemon->pidfile, cfg->chrootdir, 588238106Sdes strlen(cfg->chrootdir))==0) { 589238106Sdes char* old = daemon->pidfile; 590238106Sdes daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 591238106Sdes free(old); 592238106Sdes if(!daemon->pidfile) 593238106Sdes log_err("out of memory in pidfile adjust"); 594238106Sdes } 595238106Sdes daemon->chroot = strdup(cfg->chrootdir); 596238106Sdes if(!daemon->chroot) 597238106Sdes log_err("out of memory in daemon chroot dir storage"); 598238106Sdes } 599238106Sdes#else 600238106Sdes (void)cfgfile; 601238106Sdes#endif 602238106Sdes /* change to working directory inside chroot */ 603238106Sdes if(cfg->directory && cfg->directory[0]) { 604238106Sdes char* dir = cfg->directory; 605238106Sdes if(cfg->chrootdir && cfg->chrootdir[0] && 606238106Sdes strncmp(dir, cfg->chrootdir, 607238106Sdes strlen(cfg->chrootdir)) == 0) 608238106Sdes dir += strlen(cfg->chrootdir); 609238106Sdes if(dir[0]) { 610238106Sdes if(chdir(dir)) { 611238106Sdes fatal_exit("Could not chdir to %s: %s", 612238106Sdes dir, strerror(errno)); 613238106Sdes } 614238106Sdes verbose(VERB_QUERY, "chdir to %s", dir); 615238106Sdes } 616238106Sdes } 617238106Sdes 618238106Sdes /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 619238106Sdes#ifdef HAVE_GETPWNAM 620282089Sdes if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 621238106Sdes# ifdef HAVE_INITGROUPS 622282089Sdes if(initgroups(cfg->username, cfg_gid) != 0) 623238106Sdes log_warn("unable to initgroups %s: %s", 624238106Sdes cfg->username, strerror(errno)); 625238106Sdes# endif /* HAVE_INITGROUPS */ 626307729Sdes# ifdef HAVE_ENDPWENT 627238106Sdes endpwent(); 628307729Sdes# endif 629238106Sdes 630238106Sdes#ifdef HAVE_SETRESGID 631282089Sdes if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0) 632238106Sdes#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 633282089Sdes if(setregid(cfg_gid,cfg_gid) != 0) 634238106Sdes#else /* use setgid */ 635282089Sdes if(setgid(cfg_gid) != 0) 636238106Sdes#endif /* HAVE_SETRESGID */ 637238106Sdes fatal_exit("unable to set group id of %s: %s", 638238106Sdes cfg->username, strerror(errno)); 639238106Sdes#ifdef HAVE_SETRESUID 640282089Sdes if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0) 641238106Sdes#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 642282089Sdes if(setreuid(cfg_uid,cfg_uid) != 0) 643238106Sdes#else /* use setuid */ 644282089Sdes if(setuid(cfg_uid) != 0) 645238106Sdes#endif /* HAVE_SETRESUID */ 646238106Sdes fatal_exit("unable to set user id of %s: %s", 647238106Sdes cfg->username, strerror(errno)); 648238106Sdes verbose(VERB_QUERY, "drop user privileges, run as %s", 649238106Sdes cfg->username); 650238106Sdes } 651238106Sdes#endif /* HAVE_GETPWNAM */ 652238106Sdes /* file logging inited after chroot,chdir,setuid is done so that 653238106Sdes * it would succeed on SIGHUP as well */ 654238106Sdes if(!cfg->use_syslog) 655238106Sdes log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 656238106Sdes} 657238106Sdes 658238106Sdes/** 659238106Sdes * Run the daemon. 660238106Sdes * @param cfgfile: the config file name. 661238106Sdes * @param cmdline_verbose: verbosity resulting from commandline -v. 662238106Sdes * These increase verbosity as specified in the config file. 663238106Sdes * @param debug_mode: if set, do not daemonize. 664356345Scy * @param need_pidfile: if false, no pidfile is checked or created. 665238106Sdes */ 666238106Sdesstatic void 667361435Scyrun_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode, int need_pidfile) 668238106Sdes{ 669238106Sdes struct config_file* cfg = NULL; 670238106Sdes struct daemon* daemon = NULL; 671238106Sdes int done_setup = 0; 672238106Sdes 673238106Sdes if(!(daemon = daemon_init())) 674238106Sdes fatal_exit("alloc failure"); 675238106Sdes while(!daemon->need_to_exit) { 676238106Sdes if(done_setup) 677238106Sdes verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 678238106Sdes else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 679238106Sdes 680238106Sdes /* config stuff */ 681238106Sdes if(!(cfg = config_create())) 682238106Sdes fatal_exit("Could not alloc config defaults"); 683238106Sdes if(!config_read(cfg, cfgfile, daemon->chroot)) { 684238106Sdes if(errno != ENOENT) 685356345Scy fatal_exit("Could not read config file: %s." 686356345Scy " Maybe try unbound -dd, it stays on " 687356345Scy "the commandline to see more errors, " 688356345Scy "or unbound-checkconf", cfgfile); 689238106Sdes log_warn("Continuing with default config settings"); 690238106Sdes } 691361435Scy apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 692282089Sdes if(!done_setup) 693282089Sdes config_lookup_uid(cfg); 694238106Sdes 695238106Sdes /* prepare */ 696238106Sdes if(!daemon_open_shared_ports(daemon)) 697238106Sdes fatal_exit("could not open ports"); 698238106Sdes if(!done_setup) { 699356345Scy perform_setup(daemon, cfg, debug_mode, &cfgfile, need_pidfile); 700238106Sdes done_setup = 1; 701238106Sdes } else { 702238106Sdes /* reopen log after HUP to facilitate log rotation */ 703238106Sdes if(!cfg->use_syslog) 704238106Sdes log_init(cfg->logfile, 0, cfg->chrootdir); 705238106Sdes } 706238106Sdes /* work */ 707238106Sdes daemon_fork(daemon); 708238106Sdes 709238106Sdes /* clean up for restart */ 710238106Sdes verbose(VERB_ALGO, "cleanup."); 711238106Sdes daemon_cleanup(daemon); 712238106Sdes config_delete(cfg); 713238106Sdes } 714238106Sdes verbose(VERB_ALGO, "Exit cleanup."); 715238106Sdes /* this unlink may not work if the pidfile is located outside 716238106Sdes * of the chroot/workdir or we no longer have permissions */ 717238106Sdes if(daemon->pidfile) { 718238106Sdes int fd; 719238106Sdes /* truncate pidfile */ 720238106Sdes fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 721238106Sdes if(fd != -1) 722238106Sdes close(fd); 723238106Sdes /* delete pidfile */ 724238106Sdes unlink(daemon->pidfile); 725238106Sdes } 726238106Sdes daemon_delete(daemon); 727238106Sdes} 728238106Sdes 729238106Sdes/** getopt global, in case header files fail to declare it. */ 730238106Sdesextern int optind; 731238106Sdes/** getopt global, in case header files fail to declare it. */ 732238106Sdesextern char* optarg; 733238106Sdes 734238106Sdes/** 735238106Sdes * main program. Set options given commandline arguments. 736238106Sdes * @param argc: number of commandline arguments. 737238106Sdes * @param argv: array of commandline arguments. 738238106Sdes * @return: exit status of the program. 739238106Sdes */ 740238106Sdesint 741238106Sdesmain(int argc, char* argv[]) 742238106Sdes{ 743238106Sdes int c; 744238106Sdes const char* cfgfile = CONFIGFILE; 745238106Sdes const char* winopt = NULL; 746356345Scy const char* log_ident_default; 747238106Sdes int cmdline_verbose = 0; 748238106Sdes int debug_mode = 0; 749356345Scy int need_pidfile = 1; 750356345Scy 751238106Sdes#ifdef UB_ON_WINDOWS 752238106Sdes int cmdline_cfg = 0; 753238106Sdes#endif 754238106Sdes 755238106Sdes log_init(NULL, 0, NULL); 756356345Scy log_ident_default = strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]; 757361435Scy log_ident_set_default(log_ident_default); 758356345Scy log_ident_set(log_ident_default); 759238106Sdes /* parse the options */ 760356345Scy while( (c=getopt(argc, argv, "c:dhpvw:V")) != -1) { 761238106Sdes switch(c) { 762238106Sdes case 'c': 763238106Sdes cfgfile = optarg; 764238106Sdes#ifdef UB_ON_WINDOWS 765238106Sdes cmdline_cfg = 1; 766238106Sdes#endif 767238106Sdes break; 768238106Sdes case 'v': 769296415Sdes cmdline_verbose++; 770238106Sdes verbosity++; 771238106Sdes break; 772356345Scy case 'p': 773356345Scy need_pidfile = 0; 774356345Scy break; 775238106Sdes case 'd': 776276605Sdes debug_mode++; 777238106Sdes break; 778238106Sdes case 'w': 779238106Sdes winopt = optarg; 780238106Sdes break; 781356345Scy case 'V': 782356345Scy print_build_options(); 783356345Scy return 0; 784238106Sdes case '?': 785238106Sdes case 'h': 786238106Sdes default: 787238106Sdes usage(); 788238106Sdes return 1; 789238106Sdes } 790238106Sdes } 791238106Sdes argc -= optind; 792356345Scy /* argv += optind; not using further arguments */ 793238106Sdes 794238106Sdes if(winopt) { 795238106Sdes#ifdef UB_ON_WINDOWS 796238106Sdes wsvc_command_option(winopt, cfgfile, cmdline_verbose, 797238106Sdes cmdline_cfg); 798238106Sdes#else 799238106Sdes fatal_exit("option not supported"); 800238106Sdes#endif 801238106Sdes } 802238106Sdes 803238106Sdes if(argc != 0) { 804238106Sdes usage(); 805238106Sdes return 1; 806238106Sdes } 807238106Sdes 808361435Scy run_daemon(cfgfile, cmdline_verbose, debug_mode, need_pidfile); 809238106Sdes log_init(NULL, 0, NULL); /* close logfile */ 810356345Scy#ifndef unbound_testbound 811356345Scy if(log_get_lock()) { 812356345Scy lock_basic_destroy((lock_basic_type*)log_get_lock()); 813356345Scy } 814356345Scy#endif 815238106Sdes return 0; 816238106Sdes} 817