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 24269257Sdes * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25269257Sdes * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26269257Sdes * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27269257Sdes * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28269257Sdes * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29269257Sdes * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30269257Sdes * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31269257Sdes * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32269257Sdes * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33269257Sdes * 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" 60238106Sdes#include <signal.h> 61238106Sdes#include <fcntl.h> 62238106Sdes#include <openssl/crypto.h> 63238106Sdes#ifdef HAVE_PWD_H 64238106Sdes#include <pwd.h> 65238106Sdes#endif 66238106Sdes#ifdef HAVE_GRP_H 67238106Sdes#include <grp.h> 68238106Sdes#endif 69238106Sdes 70269257Sdes#ifndef S_SPLINT_S 71269257Sdes/* splint chokes on this system header file */ 72238106Sdes#ifdef HAVE_SYS_RESOURCE_H 73238106Sdes#include <sys/resource.h> 74238106Sdes#endif 75269257Sdes#endif /* S_SPLINT_S */ 76238106Sdes#ifdef HAVE_LOGIN_CAP_H 77238106Sdes#include <login_cap.h> 78238106Sdes#endif 79238106Sdes 80238106Sdes#ifdef USE_MINI_EVENT 81238106Sdes# ifdef USE_WINSOCK 82238106Sdes# include "util/winsock_event.h" 83238106Sdes# else 84238106Sdes# include "util/mini_event.h" 85238106Sdes# endif 86238106Sdes#else 87285206Sdes# ifdef HAVE_EVENT_H 88285206Sdes# include <event.h> 89285206Sdes# else 90285206Sdes# include "event2/event.h" 91285206Sdes# include "event2/event_struct.h" 92285206Sdes# include "event2/event_compat.h" 93285206Sdes# endif 94238106Sdes#endif 95238106Sdes 96238106Sdes#ifdef UB_ON_WINDOWS 97238106Sdes# include "winrc/win_svc.h" 98238106Sdes#endif 99238106Sdes 100249141Sdes#ifdef HAVE_NSS 101249141Sdes/* nss3 */ 102249141Sdes# include "nss.h" 103249141Sdes#endif 104249141Sdes 105255579Sdes#ifdef HAVE_SBRK 106238106Sdes/** global debug value to keep track of heap memory allocation */ 107238106Sdesvoid* unbound_start_brk = 0; 108255579Sdes#endif 109238106Sdes 110238106Sdes#if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 111238106Sdesstatic const char* ev_backend2str(int b) 112238106Sdes{ 113238106Sdes switch(b) { 114238106Sdes case EVBACKEND_SELECT: return "select"; 115238106Sdes case EVBACKEND_POLL: return "poll"; 116238106Sdes case EVBACKEND_EPOLL: return "epoll"; 117238106Sdes case EVBACKEND_KQUEUE: return "kqueue"; 118238106Sdes case EVBACKEND_DEVPOLL: return "devpoll"; 119238106Sdes case EVBACKEND_PORT: return "evport"; 120238106Sdes } 121238106Sdes return "unknown"; 122238106Sdes} 123238106Sdes#endif 124238106Sdes 125238106Sdes/** get the event system in use */ 126238106Sdesstatic void get_event_sys(const char** n, const char** s, const char** m) 127238106Sdes{ 128238106Sdes#ifdef USE_WINSOCK 129238106Sdes *n = "event"; 130238106Sdes *s = "winsock"; 131238106Sdes *m = "WSAWaitForMultipleEvents"; 132238106Sdes#elif defined(USE_MINI_EVENT) 133238106Sdes *n = "mini-event"; 134238106Sdes *s = "internal"; 135238106Sdes *m = "select"; 136238106Sdes#else 137238106Sdes struct event_base* b; 138238106Sdes *s = event_get_version(); 139238106Sdes# ifdef HAVE_EVENT_BASE_GET_METHOD 140238106Sdes *n = "libevent"; 141238106Sdes b = event_base_new(); 142238106Sdes *m = event_base_get_method(b); 143238106Sdes# elif defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 144238106Sdes *n = "libev"; 145238106Sdes b = (struct event_base*)ev_default_loop(EVFLAG_AUTO); 146238106Sdes *m = ev_backend2str(ev_backend((struct ev_loop*)b)); 147238106Sdes# else 148238106Sdes *n = "unknown"; 149238106Sdes *m = "not obtainable"; 150238106Sdes b = NULL; 151238106Sdes# endif 152238106Sdes# ifdef HAVE_EVENT_BASE_FREE 153238106Sdes event_base_free(b); 154238106Sdes# endif 155238106Sdes#endif 156238106Sdes} 157238106Sdes 158238106Sdes/** print usage. */ 159238106Sdesstatic void usage() 160238106Sdes{ 161238106Sdes const char** m; 162238106Sdes const char *evnm="event", *evsys="", *evmethod=""; 163238106Sdes printf("usage: unbound [options]\n"); 164238106Sdes printf(" start unbound daemon DNS resolver.\n"); 165238106Sdes printf("-h this help\n"); 166238106Sdes printf("-c file config file to read instead of %s\n", CONFIGFILE); 167238106Sdes printf(" file format is described in unbound.conf(5).\n"); 168238106Sdes printf("-d do not fork into the background.\n"); 169238106Sdes printf("-v verbose (more times to increase verbosity)\n"); 170238106Sdes#ifdef UB_ON_WINDOWS 171238106Sdes printf("-w opt windows option: \n"); 172238106Sdes printf(" install, remove - manage the services entry\n"); 173238106Sdes printf(" service - used to start from services control panel\n"); 174238106Sdes#endif 175238106Sdes printf("Version %s\n", PACKAGE_VERSION); 176238106Sdes get_event_sys(&evnm, &evsys, &evmethod); 177269257Sdes printf("linked libs: %s %s (it uses %s), %s\n", 178269257Sdes evnm, evsys, evmethod, 179249141Sdes#ifdef HAVE_SSL 180249141Sdes SSLeay_version(SSLEAY_VERSION) 181249141Sdes#elif defined(HAVE_NSS) 182249141Sdes NSS_GetVersion() 183294190Sdes#elif defined(HAVE_NETTLE) 184294190Sdes "nettle" 185249141Sdes#endif 186249141Sdes ); 187238106Sdes printf("linked modules:"); 188238106Sdes for(m = module_list_avail(); *m; m++) 189238106Sdes printf(" %s", *m); 190238106Sdes printf("\n"); 191238106Sdes printf("BSD licensed, see LICENSE in source package for details.\n"); 192238106Sdes printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 193238106Sdes} 194238106Sdes 195238106Sdes#ifndef unbound_testbound 196238106Sdesint replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 197238106Sdes{ 198238106Sdes log_assert(0); 199238106Sdes return 0; 200238106Sdes} 201238106Sdes#endif 202238106Sdes 203238106Sdes/** check file descriptor count */ 204238106Sdesstatic void 205238106Sdescheckrlimits(struct config_file* cfg) 206238106Sdes{ 207269257Sdes#ifndef S_SPLINT_S 208238106Sdes#ifdef HAVE_GETRLIMIT 209238106Sdes /* list has number of ports to listen to, ifs number addresses */ 210238106Sdes int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 211238106Sdes (int)cfg->incoming_num_tcp:0)); 212238106Sdes size_t listen_ifs = (size_t)(cfg->num_ifs==0? 213238106Sdes ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 214238106Sdes (cfg->do_ip6?1:0)):cfg->num_ifs); 215238106Sdes size_t listen_num = list*listen_ifs; 216238106Sdes size_t outudpnum = (size_t)cfg->outgoing_num_ports; 217238106Sdes size_t outtcpnum = cfg->outgoing_num_tcp; 218238106Sdes size_t misc = 4; /* logfile, pidfile, stdout... */ 219238106Sdes size_t perthread_noudp = listen_num + outtcpnum + 220238106Sdes 2/*cmdpipe*/ + 2/*libevent*/ + misc; 221238106Sdes size_t perthread = perthread_noudp + outudpnum; 222238106Sdes 223238106Sdes#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 224238106Sdes int numthread = 1; /* it forks */ 225238106Sdes#else 226238106Sdes int numthread = (cfg->num_threads?cfg->num_threads:1); 227238106Sdes#endif 228238106Sdes size_t total = numthread * perthread + misc; 229238106Sdes size_t avail; 230238106Sdes struct rlimit rlim; 231238106Sdes 232238106Sdes if(total > 1024 && 233238106Sdes strncmp(event_get_version(), "mini-event", 10) == 0) { 234238106Sdes log_warn("too many file descriptors requested. The builtin" 235238106Sdes "mini-event cannot handle more than 1024. Config " 236238106Sdes "for less fds or compile with libevent"); 237238106Sdes if(numthread*perthread_noudp+15 > 1024) 238238106Sdes fatal_exit("too much tcp. not enough fds."); 239238106Sdes cfg->outgoing_num_ports = (int)((1024 240238106Sdes - numthread*perthread_noudp 241238106Sdes - 10 /* safety margin */) /numthread); 242238106Sdes log_warn("continuing with less udp ports: %u", 243238106Sdes cfg->outgoing_num_ports); 244238106Sdes total = 1024; 245238106Sdes } 246238106Sdes if(perthread > 64 && 247238106Sdes strncmp(event_get_version(), "winsock-event", 13) == 0) { 248238106Sdes log_err("too many file descriptors requested. The winsock" 249238106Sdes " event handler cannot handle more than 64 per " 250238106Sdes " thread. Config for less fds"); 251238106Sdes if(perthread_noudp+2 > 64) 252238106Sdes fatal_exit("too much tcp. not enough fds."); 253238106Sdes cfg->outgoing_num_ports = (int)((64 254238106Sdes - perthread_noudp 255238106Sdes - 2/* safety margin */)); 256238106Sdes log_warn("continuing with less udp ports: %u", 257238106Sdes cfg->outgoing_num_ports); 258238106Sdes total = numthread*(perthread_noudp+ 259238106Sdes (size_t)cfg->outgoing_num_ports)+misc; 260238106Sdes } 261238106Sdes if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 262238106Sdes log_warn("getrlimit: %s", strerror(errno)); 263238106Sdes return; 264238106Sdes } 265238106Sdes if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 266238106Sdes return; 267238106Sdes if((size_t)rlim.rlim_cur < total) { 268238106Sdes avail = (size_t)rlim.rlim_cur; 269238106Sdes rlim.rlim_cur = (rlim_t)(total + 10); 270238106Sdes rlim.rlim_max = (rlim_t)(total + 10); 271238106Sdes#ifdef HAVE_SETRLIMIT 272238106Sdes if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 273238106Sdes log_warn("setrlimit: %s", strerror(errno)); 274238106Sdes#endif 275238106Sdes log_warn("cannot increase max open fds from %u to %u", 276238106Sdes (unsigned)avail, (unsigned)total+10); 277238106Sdes /* check that calculation below does not underflow, 278238106Sdes * with 15 as margin */ 279238106Sdes if(numthread*perthread_noudp+15 > avail) 280238106Sdes fatal_exit("too much tcp. not enough fds."); 281238106Sdes cfg->outgoing_num_ports = (int)((avail 282238106Sdes - numthread*perthread_noudp 283238106Sdes - 10 /* safety margin */) /numthread); 284238106Sdes log_warn("continuing with less udp ports: %u", 285238106Sdes cfg->outgoing_num_ports); 286238106Sdes log_warn("increase ulimit or decrease threads, " 287238106Sdes "ports in config to remove this warning"); 288238106Sdes return; 289285206Sdes#ifdef HAVE_SETRLIMIT 290238106Sdes } 291285206Sdes#endif 292285206Sdes verbose(VERB_ALGO, "increased limit(open files) from %u to %u", 293238106Sdes (unsigned)avail, (unsigned)total+10); 294238106Sdes } 295238106Sdes#else 296238106Sdes (void)cfg; 297238106Sdes#endif /* HAVE_GETRLIMIT */ 298269257Sdes#endif /* S_SPLINT_S */ 299238106Sdes} 300238106Sdes 301238106Sdes/** set verbosity, check rlimits, cache settings */ 302238106Sdesstatic void 303238106Sdesapply_settings(struct daemon* daemon, struct config_file* cfg, 304285206Sdes int cmdline_verbose, int debug_mode) 305238106Sdes{ 306238106Sdes /* apply if they have changed */ 307238106Sdes verbosity = cmdline_verbose + cfg->verbosity; 308285206Sdes if (debug_mode > 1) { 309285206Sdes cfg->use_syslog = 0; 310285206Sdes cfg->logfile = NULL; 311285206Sdes } 312238106Sdes daemon_apply_cfg(daemon, cfg); 313238106Sdes checkrlimits(cfg); 314238106Sdes} 315238106Sdes 316238106Sdes#ifdef HAVE_KILL 317238106Sdes/** Read existing pid from pidfile. 318238106Sdes * @param file: file name of pid file. 319238106Sdes * @return: the pid from the file or -1 if none. 320238106Sdes */ 321238106Sdesstatic pid_t 322238106Sdesreadpid (const char* file) 323238106Sdes{ 324238106Sdes int fd; 325238106Sdes pid_t pid; 326238106Sdes char pidbuf[32]; 327238106Sdes char* t; 328238106Sdes ssize_t l; 329238106Sdes 330238106Sdes if ((fd = open(file, O_RDONLY)) == -1) { 331238106Sdes if(errno != ENOENT) 332238106Sdes log_err("Could not read pidfile %s: %s", 333238106Sdes file, strerror(errno)); 334238106Sdes return -1; 335238106Sdes } 336238106Sdes 337238106Sdes if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 338238106Sdes if(errno != ENOENT) 339238106Sdes log_err("Could not read pidfile %s: %s", 340238106Sdes file, strerror(errno)); 341238106Sdes close(fd); 342238106Sdes return -1; 343238106Sdes } 344238106Sdes 345238106Sdes close(fd); 346238106Sdes 347238106Sdes /* Empty pidfile means no pidfile... */ 348238106Sdes if (l == 0) { 349238106Sdes return -1; 350238106Sdes } 351238106Sdes 352238106Sdes pidbuf[sizeof(pidbuf)-1] = 0; 353238106Sdes pid = (pid_t)strtol(pidbuf, &t, 10); 354238106Sdes 355238106Sdes if (*t && *t != '\n') { 356238106Sdes return -1; 357238106Sdes } 358238106Sdes return pid; 359238106Sdes} 360238106Sdes 361238106Sdes/** write pid to file. 362238106Sdes * @param pidfile: file name of pid file. 363238106Sdes * @param pid: pid to write to file. 364238106Sdes */ 365238106Sdesstatic void 366238106Sdeswritepid (const char* pidfile, pid_t pid) 367238106Sdes{ 368238106Sdes FILE* f; 369238106Sdes 370238106Sdes if ((f = fopen(pidfile, "w")) == NULL ) { 371238106Sdes log_err("cannot open pidfile %s: %s", 372238106Sdes pidfile, strerror(errno)); 373238106Sdes return; 374238106Sdes } 375238106Sdes if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 376238106Sdes log_err("cannot write to pidfile %s: %s", 377238106Sdes pidfile, strerror(errno)); 378238106Sdes } 379238106Sdes fclose(f); 380238106Sdes} 381238106Sdes 382238106Sdes/** 383238106Sdes * check old pid file. 384238106Sdes * @param pidfile: the file name of the pid file. 385238106Sdes * @param inchroot: if pidfile is inchroot and we can thus expect to 386238106Sdes * be able to delete it. 387238106Sdes */ 388238106Sdesstatic void 389238106Sdescheckoldpid(char* pidfile, int inchroot) 390238106Sdes{ 391238106Sdes pid_t old; 392238106Sdes if((old = readpid(pidfile)) != -1) { 393238106Sdes /* see if it is still alive */ 394238106Sdes if(kill(old, 0) == 0 || errno == EPERM) 395238106Sdes log_warn("unbound is already running as pid %u.", 396238106Sdes (unsigned)old); 397238106Sdes else if(inchroot) 398238106Sdes log_warn("did not exit gracefully last time (%u)", 399238106Sdes (unsigned)old); 400238106Sdes } 401238106Sdes} 402238106Sdes#endif /* HAVE_KILL */ 403238106Sdes 404238106Sdes/** detach from command line */ 405238106Sdesstatic void 406238106Sdesdetach(void) 407238106Sdes{ 408238106Sdes#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 409238106Sdes /* use POSIX daemon(3) function */ 410238106Sdes if(daemon(1, 0) != 0) 411238106Sdes fatal_exit("daemon failed: %s", strerror(errno)); 412238106Sdes#else /* no HAVE_DAEMON */ 413238106Sdes#ifdef HAVE_FORK 414238106Sdes int fd; 415238106Sdes /* Take off... */ 416238106Sdes switch (fork()) { 417238106Sdes case 0: 418238106Sdes break; 419238106Sdes case -1: 420238106Sdes fatal_exit("fork failed: %s", strerror(errno)); 421238106Sdes default: 422238106Sdes /* exit interactive session */ 423238106Sdes exit(0); 424238106Sdes } 425238106Sdes /* detach */ 426238106Sdes#ifdef HAVE_SETSID 427238106Sdes if(setsid() == -1) 428238106Sdes fatal_exit("setsid() failed: %s", strerror(errno)); 429238106Sdes#endif 430238106Sdes if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 431238106Sdes (void)dup2(fd, STDIN_FILENO); 432238106Sdes (void)dup2(fd, STDOUT_FILENO); 433238106Sdes (void)dup2(fd, STDERR_FILENO); 434238106Sdes if (fd > 2) 435238106Sdes (void)close(fd); 436238106Sdes } 437238106Sdes#endif /* HAVE_FORK */ 438238106Sdes#endif /* HAVE_DAEMON */ 439238106Sdes} 440238106Sdes 441238106Sdes/** daemonize, drop user priviliges and chroot if needed */ 442238106Sdesstatic void 443238106Sdesperform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 444238106Sdes const char** cfgfile) 445238106Sdes{ 446238106Sdes#ifdef HAVE_GETPWNAM 447238106Sdes struct passwd *pwd = NULL; 448238106Sdes 449238106Sdes if(cfg->username && cfg->username[0]) { 450238106Sdes if((pwd = getpwnam(cfg->username)) == NULL) 451238106Sdes fatal_exit("user '%s' does not exist.", cfg->username); 452238106Sdes /* endpwent below, in case we need pwd for setusercontext */ 453238106Sdes } 454238106Sdes#endif 455294190Sdes#ifdef UB_ON_WINDOWS 456294190Sdes w_config_adjust_directory(cfg); 457294190Sdes#endif 458238106Sdes 459238106Sdes /* init syslog (as root) if needed, before daemonize, otherwise 460238106Sdes * a fork error could not be printed since daemonize closed stderr.*/ 461238106Sdes if(cfg->use_syslog) { 462238106Sdes log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 463238106Sdes } 464238106Sdes /* if using a logfile, we cannot open it because the logfile would 465238106Sdes * be created with the wrong permissions, we cannot chown it because 466238106Sdes * we cannot chown system logfiles, so we do not open at all. 467238106Sdes * So, using a logfile, the user does not see errors unless -d is 468238106Sdes * given to unbound on the commandline. */ 469238106Sdes 470238106Sdes /* read ssl keys while superuser and outside chroot */ 471249141Sdes#ifdef HAVE_SSL 472238106Sdes if(!(daemon->rc = daemon_remote_create(cfg))) 473238106Sdes fatal_exit("could not set up remote-control"); 474238106Sdes if(cfg->ssl_service_key && cfg->ssl_service_key[0]) { 475238106Sdes if(!(daemon->listen_sslctx = listen_sslctx_create( 476238106Sdes cfg->ssl_service_key, cfg->ssl_service_pem, NULL))) 477238106Sdes fatal_exit("could not set up listen SSL_CTX"); 478238106Sdes } 479238106Sdes if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 480238106Sdes fatal_exit("could not set up connect SSL_CTX"); 481249141Sdes#endif 482238106Sdes 483238106Sdes#ifdef HAVE_KILL 484238106Sdes /* check old pid file before forking */ 485238106Sdes if(cfg->pidfile && cfg->pidfile[0]) { 486238106Sdes /* calculate position of pidfile */ 487238106Sdes if(cfg->pidfile[0] == '/') 488238106Sdes daemon->pidfile = strdup(cfg->pidfile); 489238106Sdes else daemon->pidfile = fname_after_chroot(cfg->pidfile, 490238106Sdes cfg, 1); 491238106Sdes if(!daemon->pidfile) 492238106Sdes fatal_exit("pidfile alloc: out of memory"); 493238106Sdes checkoldpid(daemon->pidfile, 494238106Sdes /* true if pidfile is inside chrootdir, or nochroot */ 495238106Sdes !(cfg->chrootdir && cfg->chrootdir[0]) || 496238106Sdes (cfg->chrootdir && cfg->chrootdir[0] && 497238106Sdes strncmp(daemon->pidfile, cfg->chrootdir, 498238106Sdes strlen(cfg->chrootdir))==0)); 499238106Sdes } 500238106Sdes#endif 501238106Sdes 502238106Sdes /* daemonize because pid is needed by the writepid func */ 503238106Sdes if(!debug_mode && cfg->do_daemonize) { 504238106Sdes detach(); 505238106Sdes } 506238106Sdes 507238106Sdes /* write new pidfile (while still root, so can be outside chroot) */ 508238106Sdes#ifdef HAVE_KILL 509238106Sdes if(cfg->pidfile && cfg->pidfile[0]) { 510238106Sdes writepid(daemon->pidfile, getpid()); 511285206Sdes if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 512285206Sdes# ifdef HAVE_CHOWN 513285206Sdes if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) { 514238106Sdes log_err("cannot chown %u.%u %s: %s", 515285206Sdes (unsigned)cfg_uid, (unsigned)cfg_gid, 516238106Sdes daemon->pidfile, strerror(errno)); 517238106Sdes } 518285206Sdes# endif /* HAVE_CHOWN */ 519238106Sdes } 520238106Sdes } 521238106Sdes#else 522238106Sdes (void)daemon; 523285206Sdes#endif /* HAVE_KILL */ 524238106Sdes 525238106Sdes /* Set user context */ 526238106Sdes#ifdef HAVE_GETPWNAM 527285206Sdes if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 528238106Sdes#ifdef HAVE_SETUSERCONTEXT 529238106Sdes /* setusercontext does initgroups, setuid, setgid, and 530238106Sdes * also resource limits from login config, but we 531238106Sdes * still call setresuid, setresgid to be sure to set all uid*/ 532285206Sdes if(setusercontext(NULL, pwd, cfg_uid, (unsigned) 533238106Sdes LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 534238106Sdes log_warn("unable to setusercontext %s: %s", 535238106Sdes cfg->username, strerror(errno)); 536238106Sdes#endif /* HAVE_SETUSERCONTEXT */ 537238106Sdes } 538238106Sdes#endif /* HAVE_GETPWNAM */ 539238106Sdes 540238106Sdes /* box into the chroot */ 541238106Sdes#ifdef HAVE_CHROOT 542238106Sdes if(cfg->chrootdir && cfg->chrootdir[0]) { 543238106Sdes if(chdir(cfg->chrootdir)) { 544238106Sdes fatal_exit("unable to chdir to chroot %s: %s", 545238106Sdes cfg->chrootdir, strerror(errno)); 546238106Sdes } 547238106Sdes verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 548238106Sdes if(chroot(cfg->chrootdir)) 549238106Sdes fatal_exit("unable to chroot to %s: %s", 550238106Sdes cfg->chrootdir, strerror(errno)); 551249141Sdes if(chdir("/")) 552249141Sdes fatal_exit("unable to chdir to / in chroot %s: %s", 553249141Sdes cfg->chrootdir, strerror(errno)); 554238106Sdes verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 555238106Sdes if(strncmp(*cfgfile, cfg->chrootdir, 556238106Sdes strlen(cfg->chrootdir)) == 0) 557238106Sdes (*cfgfile) += strlen(cfg->chrootdir); 558238106Sdes 559238106Sdes /* adjust stored pidfile for chroot */ 560238106Sdes if(daemon->pidfile && daemon->pidfile[0] && 561238106Sdes strncmp(daemon->pidfile, cfg->chrootdir, 562238106Sdes strlen(cfg->chrootdir))==0) { 563238106Sdes char* old = daemon->pidfile; 564238106Sdes daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 565238106Sdes free(old); 566238106Sdes if(!daemon->pidfile) 567238106Sdes log_err("out of memory in pidfile adjust"); 568238106Sdes } 569238106Sdes daemon->chroot = strdup(cfg->chrootdir); 570238106Sdes if(!daemon->chroot) 571238106Sdes log_err("out of memory in daemon chroot dir storage"); 572238106Sdes } 573238106Sdes#else 574238106Sdes (void)cfgfile; 575238106Sdes#endif 576238106Sdes /* change to working directory inside chroot */ 577238106Sdes if(cfg->directory && cfg->directory[0]) { 578238106Sdes char* dir = cfg->directory; 579238106Sdes if(cfg->chrootdir && cfg->chrootdir[0] && 580238106Sdes strncmp(dir, cfg->chrootdir, 581238106Sdes strlen(cfg->chrootdir)) == 0) 582238106Sdes dir += strlen(cfg->chrootdir); 583238106Sdes if(dir[0]) { 584238106Sdes if(chdir(dir)) { 585238106Sdes fatal_exit("Could not chdir to %s: %s", 586238106Sdes dir, strerror(errno)); 587238106Sdes } 588238106Sdes verbose(VERB_QUERY, "chdir to %s", dir); 589238106Sdes } 590238106Sdes } 591238106Sdes 592238106Sdes /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 593238106Sdes#ifdef HAVE_GETPWNAM 594285206Sdes if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) { 595238106Sdes# ifdef HAVE_INITGROUPS 596285206Sdes if(initgroups(cfg->username, cfg_gid) != 0) 597238106Sdes log_warn("unable to initgroups %s: %s", 598238106Sdes cfg->username, strerror(errno)); 599238106Sdes# endif /* HAVE_INITGROUPS */ 600238106Sdes endpwent(); 601238106Sdes 602238106Sdes#ifdef HAVE_SETRESGID 603285206Sdes if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0) 604238106Sdes#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 605285206Sdes if(setregid(cfg_gid,cfg_gid) != 0) 606238106Sdes#else /* use setgid */ 607285206Sdes if(setgid(cfg_gid) != 0) 608238106Sdes#endif /* HAVE_SETRESGID */ 609238106Sdes fatal_exit("unable to set group id of %s: %s", 610238106Sdes cfg->username, strerror(errno)); 611238106Sdes#ifdef HAVE_SETRESUID 612285206Sdes if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0) 613238106Sdes#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 614285206Sdes if(setreuid(cfg_uid,cfg_uid) != 0) 615238106Sdes#else /* use setuid */ 616285206Sdes if(setuid(cfg_uid) != 0) 617238106Sdes#endif /* HAVE_SETRESUID */ 618238106Sdes fatal_exit("unable to set user id of %s: %s", 619238106Sdes cfg->username, strerror(errno)); 620238106Sdes verbose(VERB_QUERY, "drop user privileges, run as %s", 621238106Sdes cfg->username); 622238106Sdes } 623238106Sdes#endif /* HAVE_GETPWNAM */ 624238106Sdes /* file logging inited after chroot,chdir,setuid is done so that 625238106Sdes * it would succeed on SIGHUP as well */ 626238106Sdes if(!cfg->use_syslog) 627238106Sdes log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 628238106Sdes} 629238106Sdes 630238106Sdes/** 631238106Sdes * Run the daemon. 632238106Sdes * @param cfgfile: the config file name. 633238106Sdes * @param cmdline_verbose: verbosity resulting from commandline -v. 634238106Sdes * These increase verbosity as specified in the config file. 635238106Sdes * @param debug_mode: if set, do not daemonize. 636238106Sdes */ 637238106Sdesstatic void 638238106Sdesrun_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 639238106Sdes{ 640238106Sdes struct config_file* cfg = NULL; 641238106Sdes struct daemon* daemon = NULL; 642238106Sdes int done_setup = 0; 643238106Sdes 644238106Sdes if(!(daemon = daemon_init())) 645238106Sdes fatal_exit("alloc failure"); 646238106Sdes while(!daemon->need_to_exit) { 647238106Sdes if(done_setup) 648238106Sdes verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 649238106Sdes else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 650238106Sdes 651238106Sdes /* config stuff */ 652238106Sdes if(!(cfg = config_create())) 653238106Sdes fatal_exit("Could not alloc config defaults"); 654238106Sdes if(!config_read(cfg, cfgfile, daemon->chroot)) { 655238106Sdes if(errno != ENOENT) 656238106Sdes fatal_exit("Could not read config file: %s", 657238106Sdes cfgfile); 658238106Sdes log_warn("Continuing with default config settings"); 659238106Sdes } 660285206Sdes apply_settings(daemon, cfg, cmdline_verbose, debug_mode); 661285206Sdes if(!done_setup) 662285206Sdes config_lookup_uid(cfg); 663238106Sdes 664238106Sdes /* prepare */ 665238106Sdes if(!daemon_open_shared_ports(daemon)) 666238106Sdes fatal_exit("could not open ports"); 667238106Sdes if(!done_setup) { 668238106Sdes perform_setup(daemon, cfg, debug_mode, &cfgfile); 669238106Sdes done_setup = 1; 670238106Sdes } else { 671238106Sdes /* reopen log after HUP to facilitate log rotation */ 672238106Sdes if(!cfg->use_syslog) 673238106Sdes log_init(cfg->logfile, 0, cfg->chrootdir); 674238106Sdes } 675238106Sdes /* work */ 676238106Sdes daemon_fork(daemon); 677238106Sdes 678238106Sdes /* clean up for restart */ 679238106Sdes verbose(VERB_ALGO, "cleanup."); 680238106Sdes daemon_cleanup(daemon); 681238106Sdes config_delete(cfg); 682238106Sdes } 683238106Sdes verbose(VERB_ALGO, "Exit cleanup."); 684238106Sdes /* this unlink may not work if the pidfile is located outside 685238106Sdes * of the chroot/workdir or we no longer have permissions */ 686238106Sdes if(daemon->pidfile) { 687238106Sdes int fd; 688238106Sdes /* truncate pidfile */ 689238106Sdes fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 690238106Sdes if(fd != -1) 691238106Sdes close(fd); 692238106Sdes /* delete pidfile */ 693238106Sdes unlink(daemon->pidfile); 694238106Sdes } 695238106Sdes daemon_delete(daemon); 696238106Sdes} 697238106Sdes 698238106Sdes/** getopt global, in case header files fail to declare it. */ 699238106Sdesextern int optind; 700238106Sdes/** getopt global, in case header files fail to declare it. */ 701238106Sdesextern char* optarg; 702238106Sdes 703238106Sdes/** 704238106Sdes * main program. Set options given commandline arguments. 705238106Sdes * @param argc: number of commandline arguments. 706238106Sdes * @param argv: array of commandline arguments. 707238106Sdes * @return: exit status of the program. 708238106Sdes */ 709238106Sdesint 710238106Sdesmain(int argc, char* argv[]) 711238106Sdes{ 712238106Sdes int c; 713238106Sdes const char* cfgfile = CONFIGFILE; 714238106Sdes const char* winopt = NULL; 715238106Sdes int cmdline_verbose = 0; 716238106Sdes int debug_mode = 0; 717238106Sdes#ifdef UB_ON_WINDOWS 718238106Sdes int cmdline_cfg = 0; 719238106Sdes#endif 720238106Sdes 721238106Sdes#ifdef HAVE_SBRK 722238106Sdes /* take debug snapshot of heap */ 723238106Sdes unbound_start_brk = sbrk(0); 724238106Sdes#endif 725238106Sdes 726238106Sdes log_init(NULL, 0, NULL); 727269257Sdes log_ident_set(strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0]); 728238106Sdes /* parse the options */ 729238106Sdes while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 730238106Sdes switch(c) { 731238106Sdes case 'c': 732238106Sdes cfgfile = optarg; 733238106Sdes#ifdef UB_ON_WINDOWS 734238106Sdes cmdline_cfg = 1; 735238106Sdes#endif 736238106Sdes break; 737238106Sdes case 'v': 738238106Sdes cmdline_verbose ++; 739238106Sdes verbosity++; 740238106Sdes break; 741238106Sdes case 'd': 742285206Sdes debug_mode++; 743238106Sdes break; 744238106Sdes case 'w': 745238106Sdes winopt = optarg; 746238106Sdes break; 747238106Sdes case '?': 748238106Sdes case 'h': 749238106Sdes default: 750238106Sdes usage(); 751238106Sdes return 1; 752238106Sdes } 753238106Sdes } 754238106Sdes argc -= optind; 755238106Sdes argv += optind; 756238106Sdes 757238106Sdes if(winopt) { 758238106Sdes#ifdef UB_ON_WINDOWS 759238106Sdes wsvc_command_option(winopt, cfgfile, cmdline_verbose, 760238106Sdes cmdline_cfg); 761238106Sdes#else 762238106Sdes fatal_exit("option not supported"); 763238106Sdes#endif 764238106Sdes } 765238106Sdes 766238106Sdes if(argc != 0) { 767238106Sdes usage(); 768238106Sdes return 1; 769238106Sdes } 770238106Sdes 771238106Sdes run_daemon(cfgfile, cmdline_verbose, debug_mode); 772238106Sdes log_init(NULL, 0, NULL); /* close logfile */ 773238106Sdes return 0; 774238106Sdes} 775