unbound.c revision 255579
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 24238106Sdes * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25238106Sdes * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26238106Sdes * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 27238106Sdes * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28238106Sdes * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29238106Sdes * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30238106Sdes * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31238106Sdes * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32238106Sdes * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33238106Sdes * 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 70238106Sdes#ifdef HAVE_SYS_RESOURCE_H 71238106Sdes#include <sys/resource.h> 72238106Sdes#endif 73238106Sdes#ifdef HAVE_LOGIN_CAP_H 74238106Sdes#include <login_cap.h> 75238106Sdes#endif 76238106Sdes 77238106Sdes#ifdef USE_MINI_EVENT 78238106Sdes# ifdef USE_WINSOCK 79238106Sdes# include "util/winsock_event.h" 80238106Sdes# else 81238106Sdes# include "util/mini_event.h" 82238106Sdes# endif 83238106Sdes#else 84238106Sdes# include <event.h> 85238106Sdes#endif 86238106Sdes 87238106Sdes#ifdef UB_ON_WINDOWS 88238106Sdes# include "winrc/win_svc.h" 89238106Sdes#endif 90238106Sdes 91249141Sdes#ifdef HAVE_NSS 92249141Sdes/* nss3 */ 93249141Sdes# include "nss.h" 94249141Sdes#endif 95249141Sdes 96255579Sdes#ifdef HAVE_SBRK 97238106Sdes/** global debug value to keep track of heap memory allocation */ 98238106Sdesvoid* unbound_start_brk = 0; 99255579Sdes#endif 100238106Sdes 101238106Sdes#if !defined(HAVE_EVENT_BASE_GET_METHOD) && (defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)) 102238106Sdesstatic const char* ev_backend2str(int b) 103238106Sdes{ 104238106Sdes switch(b) { 105238106Sdes case EVBACKEND_SELECT: return "select"; 106238106Sdes case EVBACKEND_POLL: return "poll"; 107238106Sdes case EVBACKEND_EPOLL: return "epoll"; 108238106Sdes case EVBACKEND_KQUEUE: return "kqueue"; 109238106Sdes case EVBACKEND_DEVPOLL: return "devpoll"; 110238106Sdes case EVBACKEND_PORT: return "evport"; 111238106Sdes } 112238106Sdes return "unknown"; 113238106Sdes} 114238106Sdes#endif 115238106Sdes 116238106Sdes/** get the event system in use */ 117238106Sdesstatic void get_event_sys(const char** n, const char** s, const char** m) 118238106Sdes{ 119238106Sdes#ifdef USE_WINSOCK 120238106Sdes *n = "event"; 121238106Sdes *s = "winsock"; 122238106Sdes *m = "WSAWaitForMultipleEvents"; 123238106Sdes#elif defined(USE_MINI_EVENT) 124238106Sdes *n = "mini-event"; 125238106Sdes *s = "internal"; 126238106Sdes *m = "select"; 127238106Sdes#else 128238106Sdes struct event_base* b; 129238106Sdes *s = event_get_version(); 130238106Sdes# ifdef HAVE_EVENT_BASE_GET_METHOD 131238106Sdes *n = "libevent"; 132238106Sdes b = event_base_new(); 133238106Sdes *m = event_base_get_method(b); 134238106Sdes# elif defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 135238106Sdes *n = "libev"; 136238106Sdes b = (struct event_base*)ev_default_loop(EVFLAG_AUTO); 137238106Sdes *m = ev_backend2str(ev_backend((struct ev_loop*)b)); 138238106Sdes# else 139238106Sdes *n = "unknown"; 140238106Sdes *m = "not obtainable"; 141238106Sdes b = NULL; 142238106Sdes# endif 143238106Sdes# ifdef HAVE_EVENT_BASE_FREE 144238106Sdes event_base_free(b); 145238106Sdes# endif 146238106Sdes#endif 147238106Sdes} 148238106Sdes 149238106Sdes/** print usage. */ 150238106Sdesstatic void usage() 151238106Sdes{ 152238106Sdes const char** m; 153238106Sdes const char *evnm="event", *evsys="", *evmethod=""; 154238106Sdes printf("usage: unbound [options]\n"); 155238106Sdes printf(" start unbound daemon DNS resolver.\n"); 156238106Sdes printf("-h this help\n"); 157238106Sdes printf("-c file config file to read instead of %s\n", CONFIGFILE); 158238106Sdes printf(" file format is described in unbound.conf(5).\n"); 159238106Sdes printf("-d do not fork into the background.\n"); 160238106Sdes printf("-v verbose (more times to increase verbosity)\n"); 161238106Sdes#ifdef UB_ON_WINDOWS 162238106Sdes printf("-w opt windows option: \n"); 163238106Sdes printf(" install, remove - manage the services entry\n"); 164238106Sdes printf(" service - used to start from services control panel\n"); 165238106Sdes#endif 166238106Sdes printf("Version %s\n", PACKAGE_VERSION); 167238106Sdes get_event_sys(&evnm, &evsys, &evmethod); 168238106Sdes printf("linked libs: %s %s (it uses %s), ldns %s, %s\n", 169238106Sdes evnm, evsys, evmethod, ldns_version(), 170249141Sdes#ifdef HAVE_SSL 171249141Sdes SSLeay_version(SSLEAY_VERSION) 172249141Sdes#elif defined(HAVE_NSS) 173249141Sdes NSS_GetVersion() 174249141Sdes#endif 175249141Sdes ); 176238106Sdes printf("linked modules:"); 177238106Sdes for(m = module_list_avail(); *m; m++) 178238106Sdes printf(" %s", *m); 179238106Sdes printf("\n"); 180238106Sdes printf("configured for %s on %s with options:%s\n", 181238106Sdes CONFIGURE_TARGET, CONFIGURE_DATE, CONFIGURE_BUILD_WITH); 182238106Sdes printf("BSD licensed, see LICENSE in source package for details.\n"); 183238106Sdes printf("Report bugs to %s\n", PACKAGE_BUGREPORT); 184238106Sdes} 185238106Sdes 186238106Sdes#ifndef unbound_testbound 187238106Sdesint replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b)) 188238106Sdes{ 189238106Sdes log_assert(0); 190238106Sdes return 0; 191238106Sdes} 192238106Sdes#endif 193238106Sdes 194238106Sdes/** check file descriptor count */ 195238106Sdesstatic void 196238106Sdescheckrlimits(struct config_file* cfg) 197238106Sdes{ 198238106Sdes#ifdef HAVE_GETRLIMIT 199238106Sdes /* list has number of ports to listen to, ifs number addresses */ 200238106Sdes int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 + 201238106Sdes (int)cfg->incoming_num_tcp:0)); 202238106Sdes size_t listen_ifs = (size_t)(cfg->num_ifs==0? 203238106Sdes ((cfg->do_ip4 && !cfg->if_automatic?1:0) + 204238106Sdes (cfg->do_ip6?1:0)):cfg->num_ifs); 205238106Sdes size_t listen_num = list*listen_ifs; 206238106Sdes size_t outudpnum = (size_t)cfg->outgoing_num_ports; 207238106Sdes size_t outtcpnum = cfg->outgoing_num_tcp; 208238106Sdes size_t misc = 4; /* logfile, pidfile, stdout... */ 209238106Sdes size_t perthread_noudp = listen_num + outtcpnum + 210238106Sdes 2/*cmdpipe*/ + 2/*libevent*/ + misc; 211238106Sdes size_t perthread = perthread_noudp + outudpnum; 212238106Sdes 213238106Sdes#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS) 214238106Sdes int numthread = 1; /* it forks */ 215238106Sdes#else 216238106Sdes int numthread = (cfg->num_threads?cfg->num_threads:1); 217238106Sdes#endif 218238106Sdes size_t total = numthread * perthread + misc; 219238106Sdes size_t avail; 220238106Sdes struct rlimit rlim; 221238106Sdes 222238106Sdes if(total > 1024 && 223238106Sdes strncmp(event_get_version(), "mini-event", 10) == 0) { 224238106Sdes log_warn("too many file descriptors requested. The builtin" 225238106Sdes "mini-event cannot handle more than 1024. Config " 226238106Sdes "for less fds or compile with libevent"); 227238106Sdes if(numthread*perthread_noudp+15 > 1024) 228238106Sdes fatal_exit("too much tcp. not enough fds."); 229238106Sdes cfg->outgoing_num_ports = (int)((1024 230238106Sdes - numthread*perthread_noudp 231238106Sdes - 10 /* safety margin */) /numthread); 232238106Sdes log_warn("continuing with less udp ports: %u", 233238106Sdes cfg->outgoing_num_ports); 234238106Sdes total = 1024; 235238106Sdes } 236238106Sdes if(perthread > 64 && 237238106Sdes strncmp(event_get_version(), "winsock-event", 13) == 0) { 238238106Sdes log_err("too many file descriptors requested. The winsock" 239238106Sdes " event handler cannot handle more than 64 per " 240238106Sdes " thread. Config for less fds"); 241238106Sdes if(perthread_noudp+2 > 64) 242238106Sdes fatal_exit("too much tcp. not enough fds."); 243238106Sdes cfg->outgoing_num_ports = (int)((64 244238106Sdes - perthread_noudp 245238106Sdes - 2/* safety margin */)); 246238106Sdes log_warn("continuing with less udp ports: %u", 247238106Sdes cfg->outgoing_num_ports); 248238106Sdes total = numthread*(perthread_noudp+ 249238106Sdes (size_t)cfg->outgoing_num_ports)+misc; 250238106Sdes } 251238106Sdes if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 252238106Sdes log_warn("getrlimit: %s", strerror(errno)); 253238106Sdes return; 254238106Sdes } 255238106Sdes if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY) 256238106Sdes return; 257238106Sdes if((size_t)rlim.rlim_cur < total) { 258238106Sdes avail = (size_t)rlim.rlim_cur; 259238106Sdes rlim.rlim_cur = (rlim_t)(total + 10); 260238106Sdes rlim.rlim_max = (rlim_t)(total + 10); 261238106Sdes#ifdef HAVE_SETRLIMIT 262238106Sdes if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) { 263238106Sdes log_warn("setrlimit: %s", strerror(errno)); 264238106Sdes#else 265238106Sdes if(1) { 266238106Sdes#endif 267238106Sdes log_warn("cannot increase max open fds from %u to %u", 268238106Sdes (unsigned)avail, (unsigned)total+10); 269238106Sdes /* check that calculation below does not underflow, 270238106Sdes * with 15 as margin */ 271238106Sdes if(numthread*perthread_noudp+15 > avail) 272238106Sdes fatal_exit("too much tcp. not enough fds."); 273238106Sdes cfg->outgoing_num_ports = (int)((avail 274238106Sdes - numthread*perthread_noudp 275238106Sdes - 10 /* safety margin */) /numthread); 276238106Sdes log_warn("continuing with less udp ports: %u", 277238106Sdes cfg->outgoing_num_ports); 278238106Sdes log_warn("increase ulimit or decrease threads, " 279238106Sdes "ports in config to remove this warning"); 280238106Sdes return; 281238106Sdes } 282238106Sdes log_warn("increased limit(open files) from %u to %u", 283238106Sdes (unsigned)avail, (unsigned)total+10); 284238106Sdes } 285238106Sdes#else 286238106Sdes (void)cfg; 287238106Sdes#endif /* HAVE_GETRLIMIT */ 288238106Sdes} 289238106Sdes 290238106Sdes/** set verbosity, check rlimits, cache settings */ 291238106Sdesstatic void 292238106Sdesapply_settings(struct daemon* daemon, struct config_file* cfg, 293238106Sdes int cmdline_verbose) 294238106Sdes{ 295238106Sdes /* apply if they have changed */ 296238106Sdes verbosity = cmdline_verbose + cfg->verbosity; 297238106Sdes daemon_apply_cfg(daemon, cfg); 298238106Sdes checkrlimits(cfg); 299238106Sdes} 300238106Sdes 301238106Sdes#ifdef HAVE_KILL 302238106Sdes/** Read existing pid from pidfile. 303238106Sdes * @param file: file name of pid file. 304238106Sdes * @return: the pid from the file or -1 if none. 305238106Sdes */ 306238106Sdesstatic pid_t 307238106Sdesreadpid (const char* file) 308238106Sdes{ 309238106Sdes int fd; 310238106Sdes pid_t pid; 311238106Sdes char pidbuf[32]; 312238106Sdes char* t; 313238106Sdes ssize_t l; 314238106Sdes 315238106Sdes if ((fd = open(file, O_RDONLY)) == -1) { 316238106Sdes if(errno != ENOENT) 317238106Sdes log_err("Could not read pidfile %s: %s", 318238106Sdes file, strerror(errno)); 319238106Sdes return -1; 320238106Sdes } 321238106Sdes 322238106Sdes if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) { 323238106Sdes if(errno != ENOENT) 324238106Sdes log_err("Could not read pidfile %s: %s", 325238106Sdes file, strerror(errno)); 326238106Sdes close(fd); 327238106Sdes return -1; 328238106Sdes } 329238106Sdes 330238106Sdes close(fd); 331238106Sdes 332238106Sdes /* Empty pidfile means no pidfile... */ 333238106Sdes if (l == 0) { 334238106Sdes return -1; 335238106Sdes } 336238106Sdes 337238106Sdes pidbuf[sizeof(pidbuf)-1] = 0; 338238106Sdes pid = (pid_t)strtol(pidbuf, &t, 10); 339238106Sdes 340238106Sdes if (*t && *t != '\n') { 341238106Sdes return -1; 342238106Sdes } 343238106Sdes return pid; 344238106Sdes} 345238106Sdes 346238106Sdes/** write pid to file. 347238106Sdes * @param pidfile: file name of pid file. 348238106Sdes * @param pid: pid to write to file. 349238106Sdes */ 350238106Sdesstatic void 351238106Sdeswritepid (const char* pidfile, pid_t pid) 352238106Sdes{ 353238106Sdes FILE* f; 354238106Sdes 355238106Sdes if ((f = fopen(pidfile, "w")) == NULL ) { 356238106Sdes log_err("cannot open pidfile %s: %s", 357238106Sdes pidfile, strerror(errno)); 358238106Sdes return; 359238106Sdes } 360238106Sdes if(fprintf(f, "%lu\n", (unsigned long)pid) < 0) { 361238106Sdes log_err("cannot write to pidfile %s: %s", 362238106Sdes pidfile, strerror(errno)); 363238106Sdes } 364238106Sdes fclose(f); 365238106Sdes} 366238106Sdes 367238106Sdes/** 368238106Sdes * check old pid file. 369238106Sdes * @param pidfile: the file name of the pid file. 370238106Sdes * @param inchroot: if pidfile is inchroot and we can thus expect to 371238106Sdes * be able to delete it. 372238106Sdes */ 373238106Sdesstatic void 374238106Sdescheckoldpid(char* pidfile, int inchroot) 375238106Sdes{ 376238106Sdes pid_t old; 377238106Sdes if((old = readpid(pidfile)) != -1) { 378238106Sdes /* see if it is still alive */ 379238106Sdes if(kill(old, 0) == 0 || errno == EPERM) 380238106Sdes log_warn("unbound is already running as pid %u.", 381238106Sdes (unsigned)old); 382238106Sdes else if(inchroot) 383238106Sdes log_warn("did not exit gracefully last time (%u)", 384238106Sdes (unsigned)old); 385238106Sdes } 386238106Sdes} 387238106Sdes#endif /* HAVE_KILL */ 388238106Sdes 389238106Sdes/** detach from command line */ 390238106Sdesstatic void 391238106Sdesdetach(void) 392238106Sdes{ 393238106Sdes#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON) 394238106Sdes /* use POSIX daemon(3) function */ 395238106Sdes if(daemon(1, 0) != 0) 396238106Sdes fatal_exit("daemon failed: %s", strerror(errno)); 397238106Sdes#else /* no HAVE_DAEMON */ 398238106Sdes#ifdef HAVE_FORK 399238106Sdes int fd; 400238106Sdes /* Take off... */ 401238106Sdes switch (fork()) { 402238106Sdes case 0: 403238106Sdes break; 404238106Sdes case -1: 405238106Sdes fatal_exit("fork failed: %s", strerror(errno)); 406238106Sdes default: 407238106Sdes /* exit interactive session */ 408238106Sdes exit(0); 409238106Sdes } 410238106Sdes /* detach */ 411238106Sdes#ifdef HAVE_SETSID 412238106Sdes if(setsid() == -1) 413238106Sdes fatal_exit("setsid() failed: %s", strerror(errno)); 414238106Sdes#endif 415238106Sdes if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { 416238106Sdes (void)dup2(fd, STDIN_FILENO); 417238106Sdes (void)dup2(fd, STDOUT_FILENO); 418238106Sdes (void)dup2(fd, STDERR_FILENO); 419238106Sdes if (fd > 2) 420238106Sdes (void)close(fd); 421238106Sdes } 422238106Sdes#endif /* HAVE_FORK */ 423238106Sdes#endif /* HAVE_DAEMON */ 424238106Sdes} 425238106Sdes 426238106Sdes/** daemonize, drop user priviliges and chroot if needed */ 427238106Sdesstatic void 428238106Sdesperform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode, 429238106Sdes const char** cfgfile) 430238106Sdes{ 431238106Sdes#ifdef HAVE_GETPWNAM 432238106Sdes struct passwd *pwd = NULL; 433238106Sdes uid_t uid; 434238106Sdes gid_t gid; 435238106Sdes /* initialize, but not to 0 (root) */ 436238106Sdes memset(&uid, 112, sizeof(uid)); 437238106Sdes memset(&gid, 112, sizeof(gid)); 438238106Sdes log_assert(cfg); 439238106Sdes 440238106Sdes if(cfg->username && cfg->username[0]) { 441238106Sdes if((pwd = getpwnam(cfg->username)) == NULL) 442238106Sdes fatal_exit("user '%s' does not exist.", cfg->username); 443238106Sdes uid = pwd->pw_uid; 444238106Sdes gid = pwd->pw_gid; 445238106Sdes /* endpwent below, in case we need pwd for setusercontext */ 446238106Sdes } 447238106Sdes#endif 448238106Sdes 449238106Sdes /* init syslog (as root) if needed, before daemonize, otherwise 450238106Sdes * a fork error could not be printed since daemonize closed stderr.*/ 451238106Sdes if(cfg->use_syslog) { 452238106Sdes log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 453238106Sdes } 454238106Sdes /* if using a logfile, we cannot open it because the logfile would 455238106Sdes * be created with the wrong permissions, we cannot chown it because 456238106Sdes * we cannot chown system logfiles, so we do not open at all. 457238106Sdes * So, using a logfile, the user does not see errors unless -d is 458238106Sdes * given to unbound on the commandline. */ 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"); 468238106Sdes } 469238106Sdes if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL, NULL))) 470238106Sdes fatal_exit("could not set up connect SSL_CTX"); 471249141Sdes#endif 472238106Sdes 473238106Sdes#ifdef HAVE_KILL 474238106Sdes /* check old pid file before forking */ 475238106Sdes if(cfg->pidfile && cfg->pidfile[0]) { 476238106Sdes /* calculate position of pidfile */ 477238106Sdes if(cfg->pidfile[0] == '/') 478238106Sdes daemon->pidfile = strdup(cfg->pidfile); 479238106Sdes else daemon->pidfile = fname_after_chroot(cfg->pidfile, 480238106Sdes cfg, 1); 481238106Sdes if(!daemon->pidfile) 482238106Sdes fatal_exit("pidfile alloc: out of memory"); 483238106Sdes checkoldpid(daemon->pidfile, 484238106Sdes /* true if pidfile is inside chrootdir, or nochroot */ 485238106Sdes !(cfg->chrootdir && cfg->chrootdir[0]) || 486238106Sdes (cfg->chrootdir && cfg->chrootdir[0] && 487238106Sdes strncmp(daemon->pidfile, cfg->chrootdir, 488238106Sdes strlen(cfg->chrootdir))==0)); 489238106Sdes } 490238106Sdes#endif 491238106Sdes 492238106Sdes /* daemonize because pid is needed by the writepid func */ 493238106Sdes if(!debug_mode && cfg->do_daemonize) { 494238106Sdes detach(); 495238106Sdes } 496238106Sdes 497238106Sdes /* write new pidfile (while still root, so can be outside chroot) */ 498238106Sdes#ifdef HAVE_KILL 499238106Sdes if(cfg->pidfile && cfg->pidfile[0]) { 500238106Sdes writepid(daemon->pidfile, getpid()); 501238106Sdes if(!(cfg->chrootdir && cfg->chrootdir[0]) || 502238106Sdes (cfg->chrootdir && cfg->chrootdir[0] && 503238106Sdes strncmp(daemon->pidfile, cfg->chrootdir, 504238106Sdes strlen(cfg->chrootdir))==0)) { 505238106Sdes /* delete of pidfile could potentially work, 506238106Sdes * chown to get permissions */ 507238106Sdes if(cfg->username && cfg->username[0]) { 508238106Sdes if(chown(daemon->pidfile, uid, gid) == -1) { 509238106Sdes log_err("cannot chown %u.%u %s: %s", 510238106Sdes (unsigned)uid, (unsigned)gid, 511238106Sdes daemon->pidfile, strerror(errno)); 512238106Sdes } 513238106Sdes } 514238106Sdes } 515238106Sdes } 516238106Sdes#else 517238106Sdes (void)daemon; 518238106Sdes#endif 519238106Sdes 520238106Sdes /* Set user context */ 521238106Sdes#ifdef HAVE_GETPWNAM 522238106Sdes if(cfg->username && cfg->username[0]) { 523238106Sdes#ifdef HAVE_SETUSERCONTEXT 524238106Sdes /* setusercontext does initgroups, setuid, setgid, and 525238106Sdes * also resource limits from login config, but we 526238106Sdes * still call setresuid, setresgid to be sure to set all uid*/ 527238106Sdes if(setusercontext(NULL, pwd, uid, 528238106Sdes LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0) 529238106Sdes log_warn("unable to setusercontext %s: %s", 530238106Sdes cfg->username, strerror(errno)); 531238106Sdes#endif /* HAVE_SETUSERCONTEXT */ 532238106Sdes } 533238106Sdes#endif /* HAVE_GETPWNAM */ 534238106Sdes 535238106Sdes /* box into the chroot */ 536238106Sdes#ifdef HAVE_CHROOT 537238106Sdes if(cfg->chrootdir && cfg->chrootdir[0]) { 538238106Sdes if(chdir(cfg->chrootdir)) { 539238106Sdes fatal_exit("unable to chdir to chroot %s: %s", 540238106Sdes cfg->chrootdir, strerror(errno)); 541238106Sdes } 542238106Sdes verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir); 543238106Sdes if(chroot(cfg->chrootdir)) 544238106Sdes fatal_exit("unable to chroot to %s: %s", 545238106Sdes cfg->chrootdir, strerror(errno)); 546249141Sdes if(chdir("/")) 547249141Sdes fatal_exit("unable to chdir to / in chroot %s: %s", 548249141Sdes cfg->chrootdir, strerror(errno)); 549238106Sdes verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir); 550238106Sdes if(strncmp(*cfgfile, cfg->chrootdir, 551238106Sdes strlen(cfg->chrootdir)) == 0) 552238106Sdes (*cfgfile) += strlen(cfg->chrootdir); 553238106Sdes 554238106Sdes /* adjust stored pidfile for chroot */ 555238106Sdes if(daemon->pidfile && daemon->pidfile[0] && 556238106Sdes strncmp(daemon->pidfile, cfg->chrootdir, 557238106Sdes strlen(cfg->chrootdir))==0) { 558238106Sdes char* old = daemon->pidfile; 559238106Sdes daemon->pidfile = strdup(old+strlen(cfg->chrootdir)); 560238106Sdes free(old); 561238106Sdes if(!daemon->pidfile) 562238106Sdes log_err("out of memory in pidfile adjust"); 563238106Sdes } 564238106Sdes daemon->chroot = strdup(cfg->chrootdir); 565238106Sdes if(!daemon->chroot) 566238106Sdes log_err("out of memory in daemon chroot dir storage"); 567238106Sdes } 568238106Sdes#else 569238106Sdes (void)cfgfile; 570238106Sdes#endif 571238106Sdes /* change to working directory inside chroot */ 572238106Sdes if(cfg->directory && cfg->directory[0]) { 573238106Sdes char* dir = cfg->directory; 574238106Sdes if(cfg->chrootdir && cfg->chrootdir[0] && 575238106Sdes strncmp(dir, cfg->chrootdir, 576238106Sdes strlen(cfg->chrootdir)) == 0) 577238106Sdes dir += strlen(cfg->chrootdir); 578238106Sdes if(dir[0]) { 579238106Sdes if(chdir(dir)) { 580238106Sdes fatal_exit("Could not chdir to %s: %s", 581238106Sdes dir, strerror(errno)); 582238106Sdes } 583238106Sdes verbose(VERB_QUERY, "chdir to %s", dir); 584238106Sdes } 585238106Sdes } 586238106Sdes 587238106Sdes /* drop permissions after chroot, getpwnam, pidfile, syslog done*/ 588238106Sdes#ifdef HAVE_GETPWNAM 589238106Sdes if(cfg->username && cfg->username[0]) { 590238106Sdes# ifdef HAVE_INITGROUPS 591238106Sdes if(initgroups(cfg->username, gid) != 0) 592238106Sdes log_warn("unable to initgroups %s: %s", 593238106Sdes cfg->username, strerror(errno)); 594238106Sdes# endif /* HAVE_INITGROUPS */ 595238106Sdes endpwent(); 596238106Sdes 597238106Sdes#ifdef HAVE_SETRESGID 598238106Sdes if(setresgid(gid,gid,gid) != 0) 599238106Sdes#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID) 600238106Sdes if(setregid(gid,gid) != 0) 601238106Sdes#else /* use setgid */ 602238106Sdes if(setgid(gid) != 0) 603238106Sdes#endif /* HAVE_SETRESGID */ 604238106Sdes fatal_exit("unable to set group id of %s: %s", 605238106Sdes cfg->username, strerror(errno)); 606238106Sdes#ifdef HAVE_SETRESUID 607238106Sdes if(setresuid(uid,uid,uid) != 0) 608238106Sdes#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID) 609238106Sdes if(setreuid(uid,uid) != 0) 610238106Sdes#else /* use setuid */ 611238106Sdes if(setuid(uid) != 0) 612238106Sdes#endif /* HAVE_SETRESUID */ 613238106Sdes fatal_exit("unable to set user id of %s: %s", 614238106Sdes cfg->username, strerror(errno)); 615238106Sdes verbose(VERB_QUERY, "drop user privileges, run as %s", 616238106Sdes cfg->username); 617238106Sdes } 618238106Sdes#endif /* HAVE_GETPWNAM */ 619238106Sdes /* file logging inited after chroot,chdir,setuid is done so that 620238106Sdes * it would succeed on SIGHUP as well */ 621238106Sdes if(!cfg->use_syslog) 622238106Sdes log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir); 623238106Sdes} 624238106Sdes 625238106Sdes/** 626238106Sdes * Run the daemon. 627238106Sdes * @param cfgfile: the config file name. 628238106Sdes * @param cmdline_verbose: verbosity resulting from commandline -v. 629238106Sdes * These increase verbosity as specified in the config file. 630238106Sdes * @param debug_mode: if set, do not daemonize. 631238106Sdes */ 632238106Sdesstatic void 633238106Sdesrun_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode) 634238106Sdes{ 635238106Sdes struct config_file* cfg = NULL; 636238106Sdes struct daemon* daemon = NULL; 637238106Sdes int done_setup = 0; 638238106Sdes 639238106Sdes if(!(daemon = daemon_init())) 640238106Sdes fatal_exit("alloc failure"); 641238106Sdes while(!daemon->need_to_exit) { 642238106Sdes if(done_setup) 643238106Sdes verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING); 644238106Sdes else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING); 645238106Sdes 646238106Sdes /* config stuff */ 647238106Sdes if(!(cfg = config_create())) 648238106Sdes fatal_exit("Could not alloc config defaults"); 649238106Sdes if(!config_read(cfg, cfgfile, daemon->chroot)) { 650238106Sdes if(errno != ENOENT) 651238106Sdes fatal_exit("Could not read config file: %s", 652238106Sdes cfgfile); 653238106Sdes log_warn("Continuing with default config settings"); 654238106Sdes } 655238106Sdes apply_settings(daemon, cfg, cmdline_verbose); 656238106Sdes 657238106Sdes /* prepare */ 658238106Sdes if(!daemon_open_shared_ports(daemon)) 659238106Sdes fatal_exit("could not open ports"); 660238106Sdes if(!done_setup) { 661238106Sdes perform_setup(daemon, cfg, debug_mode, &cfgfile); 662238106Sdes done_setup = 1; 663238106Sdes } else { 664238106Sdes /* reopen log after HUP to facilitate log rotation */ 665238106Sdes if(!cfg->use_syslog) 666238106Sdes log_init(cfg->logfile, 0, cfg->chrootdir); 667238106Sdes } 668238106Sdes /* work */ 669238106Sdes daemon_fork(daemon); 670238106Sdes 671238106Sdes /* clean up for restart */ 672238106Sdes verbose(VERB_ALGO, "cleanup."); 673238106Sdes daemon_cleanup(daemon); 674238106Sdes config_delete(cfg); 675238106Sdes } 676238106Sdes verbose(VERB_ALGO, "Exit cleanup."); 677238106Sdes /* this unlink may not work if the pidfile is located outside 678238106Sdes * of the chroot/workdir or we no longer have permissions */ 679238106Sdes if(daemon->pidfile) { 680238106Sdes int fd; 681238106Sdes /* truncate pidfile */ 682238106Sdes fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644); 683238106Sdes if(fd != -1) 684238106Sdes close(fd); 685238106Sdes /* delete pidfile */ 686238106Sdes unlink(daemon->pidfile); 687238106Sdes } 688238106Sdes daemon_delete(daemon); 689238106Sdes} 690238106Sdes 691238106Sdes/** getopt global, in case header files fail to declare it. */ 692238106Sdesextern int optind; 693238106Sdes/** getopt global, in case header files fail to declare it. */ 694238106Sdesextern char* optarg; 695238106Sdes 696238106Sdes/** 697238106Sdes * main program. Set options given commandline arguments. 698238106Sdes * @param argc: number of commandline arguments. 699238106Sdes * @param argv: array of commandline arguments. 700238106Sdes * @return: exit status of the program. 701238106Sdes */ 702238106Sdesint 703238106Sdesmain(int argc, char* argv[]) 704238106Sdes{ 705238106Sdes int c; 706238106Sdes const char* cfgfile = CONFIGFILE; 707238106Sdes const char* winopt = NULL; 708238106Sdes int cmdline_verbose = 0; 709238106Sdes int debug_mode = 0; 710238106Sdes#ifdef UB_ON_WINDOWS 711238106Sdes int cmdline_cfg = 0; 712238106Sdes#endif 713238106Sdes 714238106Sdes#ifdef HAVE_SBRK 715238106Sdes /* take debug snapshot of heap */ 716238106Sdes unbound_start_brk = sbrk(0); 717238106Sdes#endif 718238106Sdes 719238106Sdes log_init(NULL, 0, NULL); 720238106Sdes /* parse the options */ 721238106Sdes while( (c=getopt(argc, argv, "c:dhvw:")) != -1) { 722238106Sdes switch(c) { 723238106Sdes case 'c': 724238106Sdes cfgfile = optarg; 725238106Sdes#ifdef UB_ON_WINDOWS 726238106Sdes cmdline_cfg = 1; 727238106Sdes#endif 728238106Sdes break; 729238106Sdes case 'v': 730238106Sdes cmdline_verbose ++; 731238106Sdes verbosity++; 732238106Sdes break; 733238106Sdes case 'd': 734238106Sdes debug_mode = 1; 735238106Sdes break; 736238106Sdes case 'w': 737238106Sdes winopt = optarg; 738238106Sdes break; 739238106Sdes case '?': 740238106Sdes case 'h': 741238106Sdes default: 742238106Sdes usage(); 743238106Sdes return 1; 744238106Sdes } 745238106Sdes } 746238106Sdes argc -= optind; 747238106Sdes argv += optind; 748238106Sdes 749238106Sdes if(winopt) { 750238106Sdes#ifdef UB_ON_WINDOWS 751238106Sdes wsvc_command_option(winopt, cfgfile, cmdline_verbose, 752238106Sdes cmdline_cfg); 753238106Sdes#else 754238106Sdes fatal_exit("option not supported"); 755238106Sdes#endif 756238106Sdes } 757238106Sdes 758238106Sdes if(argc != 0) { 759238106Sdes usage(); 760238106Sdes return 1; 761238106Sdes } 762238106Sdes 763238106Sdes run_daemon(cfgfile, cmdline_verbose, debug_mode); 764238106Sdes log_init(NULL, 0, NULL); /* close logfile */ 765238106Sdes return 0; 766238106Sdes} 767