ntpd.c revision 294904
1/* 2 * ntpd.c - main program for the fixed point NTP daemon 3 */ 4 5#ifdef HAVE_CONFIG_H 6# include <config.h> 7#endif 8 9#include "ntp_machine.h" 10#include "ntpd.h" 11#include "ntp_io.h" 12#include "ntp_stdlib.h" 13#include <ntp_random.h> 14 15#include "ntp_config.h" 16#include "ntp_syslog.h" 17#include "ntp_assert.h" 18#include "isc/error.h" 19#include "isc/strerror.h" 20#include "isc/formatcheck.h" 21#include "iosignal.h" 22 23#ifdef SIM 24# include "ntpsim.h" 25#endif 26 27#include "ntp_libopts.h" 28#include "ntpd-opts.h" 29 30/* there's a short treatise below what the thread stuff is for. 31 * [Bug 2954] enable the threading warm-up only for Linux. 32 */ 33#if defined(HAVE_PTHREADS) && HAVE_PTHREADS && !defined(NO_THREADS) 34# ifdef HAVE_PTHREAD_H 35# include <pthread.h> 36# endif 37# if defined(linux) 38# define NEED_PTHREAD_WARMUP 39# endif 40#endif 41 42#ifdef HAVE_UNISTD_H 43# include <unistd.h> 44#endif 45#ifdef HAVE_SYS_STAT_H 46# include <sys/stat.h> 47#endif 48#include <stdio.h> 49#ifdef HAVE_SYS_PARAM_H 50# include <sys/param.h> 51#endif 52#ifdef HAVE_SYS_SIGNAL_H 53# include <sys/signal.h> 54#else 55# include <signal.h> 56#endif 57#ifdef HAVE_SYS_IOCTL_H 58# include <sys/ioctl.h> 59#endif /* HAVE_SYS_IOCTL_H */ 60#if defined(HAVE_RTPRIO) 61# ifdef HAVE_SYS_LOCK_H 62# include <sys/lock.h> 63# endif 64# include <sys/rtprio.h> 65#else 66# ifdef HAVE_PLOCK 67# ifdef HAVE_SYS_LOCK_H 68# include <sys/lock.h> 69# endif 70# endif 71#endif 72#if defined(HAVE_SCHED_SETSCHEDULER) 73# ifdef HAVE_SCHED_H 74# include <sched.h> 75# else 76# ifdef HAVE_SYS_SCHED_H 77# include <sys/sched.h> 78# endif 79# endif 80#endif 81#if defined(HAVE_SYS_MMAN_H) 82# include <sys/mman.h> 83#endif 84 85#ifdef HAVE_TERMIOS_H 86# include <termios.h> 87#endif 88 89#ifdef SYS_DOMAINOS 90# include <apollo/base.h> 91#endif /* SYS_DOMAINOS */ 92 93 94#include "recvbuff.h" 95#include "ntp_cmdargs.h" 96 97#if 0 /* HMS: I don't think we need this. 961223 */ 98#ifdef LOCK_PROCESS 99# ifdef SYS_SOLARIS 100# include <sys/mman.h> 101# else 102# include <sys/lock.h> 103# endif 104#endif 105#endif 106 107#ifdef _AIX 108# include <ulimit.h> 109#endif /* _AIX */ 110 111#ifdef SCO5_CLOCK 112# include <sys/ci/ciioctl.h> 113#endif 114 115#ifdef HAVE_DROPROOT 116# include <ctype.h> 117# include <grp.h> 118# include <pwd.h> 119#ifdef HAVE_LINUX_CAPABILITIES 120# include <sys/capability.h> 121# include <sys/prctl.h> 122#endif /* HAVE_LINUX_CAPABILITIES */ 123#if defined(HAVE_PRIV_H) && defined(HAVE_SOLARIS_PRIVS) 124# include <priv.h> 125#endif /* HAVE_PRIV_H */ 126#endif /* HAVE_DROPROOT */ 127 128#if defined (LIBSECCOMP) && (KERN_SECCOMP) 129/* # include <sys/types.h> */ 130# include <sys/resource.h> 131# include <seccomp.h> 132#endif /* LIBSECCOMP and KERN_SECCOMP */ 133 134#ifdef HAVE_DNSREGISTRATION 135# include <dns_sd.h> 136DNSServiceRef mdns; 137#endif 138 139#ifdef HAVE_SETPGRP_0 140# define ntp_setpgrp(x, y) setpgrp() 141#else 142# define ntp_setpgrp(x, y) setpgrp(x, y) 143#endif 144 145#ifdef HAVE_SOLARIS_PRIVS 146# define LOWPRIVS "basic,sys_time,net_privaddr,proc_setid,!proc_info,!proc_session,!proc_exec" 147static priv_set_t *lowprivs = NULL; 148static priv_set_t *highprivs = NULL; 149#endif /* HAVE_SOLARIS_PRIVS */ 150/* 151 * Scheduling priority we run at 152 */ 153#define NTPD_PRIO (-12) 154 155int priority_done = 2; /* 0 - Set priority */ 156 /* 1 - priority is OK where it is */ 157 /* 2 - Don't set priority */ 158 /* 1 and 2 are pretty much the same */ 159 160int listen_to_virtual_ips = TRUE; 161 162/* 163 * No-fork flag. If set, we do not become a background daemon. 164 */ 165int nofork; /* Fork by default */ 166 167#ifdef HAVE_DNSREGISTRATION 168/* 169 * mDNS registration flag. If set, we attempt to register with the mDNS system, but only 170 * after we have synched the first time. If the attempt fails, then try again once per 171 * minute for up to 5 times. After all, we may be starting before mDNS. 172 */ 173int mdnsreg = FALSE; 174int mdnstries = 5; 175#endif /* HAVE_DNSREGISTRATION */ 176 177#ifdef HAVE_DROPROOT 178int droproot; 179int root_dropped; 180char *user; /* User to switch to */ 181char *group; /* group to switch to */ 182const char *chrootdir; /* directory to chroot to */ 183uid_t sw_uid; 184gid_t sw_gid; 185char *endp; 186struct group *gr; 187struct passwd *pw; 188#endif /* HAVE_DROPROOT */ 189 190#ifdef HAVE_WORKING_FORK 191int waitsync_fd_to_close = -1; /* -w/--wait-sync */ 192#endif 193 194/* 195 * Version declaration 196 */ 197extern const char *Version; 198 199char const *progname; 200 201int was_alarmed; 202 203#ifdef DECL_SYSCALL 204/* 205 * We put this here, since the argument profile is syscall-specific 206 */ 207extern int syscall (int, ...); 208#endif /* DECL_SYSCALL */ 209 210 211#if !defined(SIM) && defined(SIGDIE1) 212static volatile int signalled = 0; 213static volatile int signo = 0; 214 215/* In an ideal world, 'finish_safe()' would declared as noreturn... */ 216static void finish_safe (int); 217static RETSIGTYPE finish (int); 218#endif 219 220#if !defined(SIM) && defined(HAVE_WORKING_FORK) 221static int wait_child_sync_if (int, long); 222#endif 223 224#if !defined(SIM) && !defined(SYS_WINNT) 225# ifdef DEBUG 226static RETSIGTYPE moredebug (int); 227static RETSIGTYPE lessdebug (int); 228# else /* !DEBUG follows */ 229static RETSIGTYPE no_debug (int); 230# endif /* !DEBUG */ 231#endif /* !SIM && !SYS_WINNT */ 232 233int saved_argc; 234char ** saved_argv; 235 236#ifndef SIM 237int ntpdmain (int, char **); 238static void set_process_priority (void); 239static void assertion_failed (const char *, int, 240 isc_assertiontype_t, 241 const char *) 242 __attribute__ ((__noreturn__)); 243static void library_fatal_error (const char *, int, 244 const char *, va_list) 245 ISC_FORMAT_PRINTF(3, 0); 246static void library_unexpected_error(const char *, int, 247 const char *, va_list) 248 ISC_FORMAT_PRINTF(3, 0); 249#endif /* !SIM */ 250 251 252/* Bug2332 unearthed a problem in the interaction of reduced user 253 * privileges, the limits on memory usage and some versions of the 254 * pthread library on Linux systems. The 'pthread_cancel()' function and 255 * likely some others need to track the stack of the thread involved, 256 * and uses a function that comes from GCC (--> libgcc_s.so) to do 257 * this. Unfortunately the developers of glibc decided to load the 258 * library on demand, which speeds up program start but can cause 259 * trouble here: Due to all the things NTPD does to limit its resource 260 * usage, this deferred load of libgcc_s does not always work once the 261 * restrictions are in effect. 262 * 263 * One way out of this was attempting a forced link against libgcc_s 264 * when possible because it makes the library available immediately 265 * without deferred load. (The symbol resolution would still be dynamic 266 * and on demand, but the code would already be in the process image.) 267 * 268 * This is a tricky thing to do, since it's not necessary everywhere, 269 * not possible everywhere, has shown to break the build of other 270 * programs in the NTP suite and is now generally frowned upon. 271 * 272 * So we take a different approach here: We creat a worker thread that does 273 * actually nothing except waiting for cancellation and cancel it. If 274 * this is done before all the limitations are put in place, the 275 * machinery is pre-heated and all the runtime stuff should be in place 276 * and useable when needed. 277 * 278 * This uses only the standard pthread API and should work with all 279 * implementations of pthreads. It is not necessary everywhere, but it's 280 * cheap enough to go on nearly unnoticed. 281 * 282 * Addendum: Bug 2954 showed that the assumption that this should work 283 * with all OS is wrong -- at least FreeBSD bombs heavily. 284 */ 285#ifdef NEED_PTHREAD_WARMUP 286 287/* simple thread function: sleep until cancelled, just to exercise 288 * thread cancellation. 289 */ 290static void* 291my_pthread_warmup_worker( 292 void *thread_args) 293{ 294 (void)thread_args; 295 for (;;) 296 sleep(10); 297 return NULL; 298} 299 300/* pre-heat threading: create a thread and cancel it, just to exercise 301 * thread cancellation. 302 */ 303static void 304my_pthread_warmup(void) 305{ 306 pthread_t thread; 307 pthread_attr_t thr_attr; 308 int rc; 309 310 pthread_attr_init(&thr_attr); 311#if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \ 312 defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && \ 313 defined(PTHREAD_STACK_MIN) 314 rc = pthread_attr_setstacksize(&thr_attr, PTHREAD_STACK_MIN); 315 if (0 != rc) 316 msyslog(LOG_ERR, 317 "my_pthread_warmup: pthread_attr_setstacksize() -> %s", 318 strerror(rc)); 319#endif 320 rc = pthread_create( 321 &thread, &thr_attr, my_pthread_warmup_worker, NULL); 322 pthread_attr_destroy(&thr_attr); 323 if (0 != rc) { 324 msyslog(LOG_ERR, 325 "my_pthread_warmup: pthread_create() -> %s", 326 strerror(rc)); 327 } else { 328 pthread_cancel(thread); 329 pthread_join(thread, NULL); 330 } 331} 332 333#endif /*defined(NEED_PTHREAD_WARMUP)*/ 334 335 336void 337parse_cmdline_opts( 338 int * pargc, 339 char ***pargv 340 ) 341{ 342 static int parsed; 343 static int optct; 344 345 if (!parsed) 346 optct = ntpOptionProcess(&ntpdOptions, *pargc, *pargv); 347 348 parsed = 1; 349 350 *pargc -= optct; 351 *pargv += optct; 352} 353 354 355#ifdef SIM 356int 357main( 358 int argc, 359 char *argv[] 360 ) 361{ 362 progname = argv[0]; 363 parse_cmdline_opts(&argc, &argv); 364#ifdef DEBUG 365 debug = OPT_VALUE_SET_DEBUG_LEVEL; 366 DPRINTF(1, ("%s\n", Version)); 367#endif 368 369 return ntpsim(argc, argv); 370} 371#else /* !SIM follows */ 372#ifdef NO_MAIN_ALLOWED 373CALL(ntpd,"ntpd",ntpdmain); 374#else /* !NO_MAIN_ALLOWED follows */ 375#ifndef SYS_WINNT 376int 377main( 378 int argc, 379 char *argv[] 380 ) 381{ 382 return ntpdmain(argc, argv); 383} 384#endif /* !SYS_WINNT */ 385#endif /* !NO_MAIN_ALLOWED */ 386#endif /* !SIM */ 387 388#ifdef _AIX 389/* 390 * OK. AIX is different than solaris in how it implements plock(). 391 * If you do NOT adjust the stack limit, you will get the MAXIMUM 392 * stack size allocated and PINNED with you program. To check the 393 * value, use ulimit -a. 394 * 395 * To fix this, we create an automatic variable and set our stack limit 396 * to that PLUS 32KB of extra space (we need some headroom). 397 * 398 * This subroutine gets the stack address. 399 * 400 * Grover Davidson and Matt Ladendorf 401 * 402 */ 403static char * 404get_aix_stack(void) 405{ 406 char ch; 407 return (&ch); 408} 409 410/* 411 * Signal handler for SIGDANGER. 412 */ 413static void 414catch_danger(int signo) 415{ 416 msyslog(LOG_INFO, "ntpd: setpgid(): %m"); 417 /* Make the system believe we'll free something, but don't do it! */ 418 return; 419} 420#endif /* _AIX */ 421 422/* 423 * Set the process priority 424 */ 425#ifndef SIM 426static void 427set_process_priority(void) 428{ 429 430# ifdef DEBUG 431 if (debug > 1) 432 msyslog(LOG_DEBUG, "set_process_priority: %s: priority_done is <%d>", 433 ((priority_done) 434 ? "Leave priority alone" 435 : "Attempt to set priority" 436 ), 437 priority_done); 438# endif /* DEBUG */ 439 440# if defined(HAVE_SCHED_SETSCHEDULER) 441 if (!priority_done) { 442 extern int config_priority_override, config_priority; 443 int pmax, pmin; 444 struct sched_param sched; 445 446 pmax = sched_get_priority_max(SCHED_FIFO); 447 sched.sched_priority = pmax; 448 if ( config_priority_override ) { 449 pmin = sched_get_priority_min(SCHED_FIFO); 450 if ( config_priority > pmax ) 451 sched.sched_priority = pmax; 452 else if ( config_priority < pmin ) 453 sched.sched_priority = pmin; 454 else 455 sched.sched_priority = config_priority; 456 } 457 if ( sched_setscheduler(0, SCHED_FIFO, &sched) == -1 ) 458 msyslog(LOG_ERR, "sched_setscheduler(): %m"); 459 else 460 ++priority_done; 461 } 462# endif /* HAVE_SCHED_SETSCHEDULER */ 463# ifdef HAVE_RTPRIO 464# ifdef RTP_SET 465 if (!priority_done) { 466 struct rtprio srtp; 467 468 srtp.type = RTP_PRIO_REALTIME; /* was: RTP_PRIO_NORMAL */ 469 srtp.prio = 0; /* 0 (hi) -> RTP_PRIO_MAX (31,lo) */ 470 471 if (rtprio(RTP_SET, getpid(), &srtp) < 0) 472 msyslog(LOG_ERR, "rtprio() error: %m"); 473 else 474 ++priority_done; 475 } 476# else /* !RTP_SET follows */ 477 if (!priority_done) { 478 if (rtprio(0, 120) < 0) 479 msyslog(LOG_ERR, "rtprio() error: %m"); 480 else 481 ++priority_done; 482 } 483# endif /* !RTP_SET */ 484# endif /* HAVE_RTPRIO */ 485# if defined(NTPD_PRIO) && NTPD_PRIO != 0 486# ifdef HAVE_ATT_NICE 487 if (!priority_done) { 488 errno = 0; 489 if (-1 == nice (NTPD_PRIO) && errno != 0) 490 msyslog(LOG_ERR, "nice() error: %m"); 491 else 492 ++priority_done; 493 } 494# endif /* HAVE_ATT_NICE */ 495# ifdef HAVE_BSD_NICE 496 if (!priority_done) { 497 if (-1 == setpriority(PRIO_PROCESS, 0, NTPD_PRIO)) 498 msyslog(LOG_ERR, "setpriority() error: %m"); 499 else 500 ++priority_done; 501 } 502# endif /* HAVE_BSD_NICE */ 503# endif /* NTPD_PRIO && NTPD_PRIO != 0 */ 504 if (!priority_done) 505 msyslog(LOG_ERR, "set_process_priority: No way found to improve our priority"); 506} 507#endif /* !SIM */ 508 509 510/* 511 * Main program. Initialize us, disconnect us from the tty if necessary, 512 * and loop waiting for I/O and/or timer expiries. 513 */ 514#ifndef SIM 515int 516ntpdmain( 517 int argc, 518 char *argv[] 519 ) 520{ 521 l_fp now; 522 struct recvbuf *rbuf; 523 const char * logfilename; 524# ifdef HAVE_UMASK 525 mode_t uv; 526# endif 527# if defined(HAVE_GETUID) && !defined(MPE) /* MPE lacks the concept of root */ 528 uid_t uid; 529# endif 530# if defined(HAVE_WORKING_FORK) 531 long wait_sync = 0; 532 int pipe_fds[2]; 533 int rc; 534 int exit_code; 535# ifdef _AIX 536 struct sigaction sa; 537# endif 538# if !defined(HAVE_SETSID) && !defined (HAVE_SETPGID) && defined(TIOCNOTTY) 539 int fid; 540# endif 541# endif /* HAVE_WORKING_FORK*/ 542# ifdef SCO5_CLOCK 543 int fd; 544 int zero; 545# endif 546 547# ifdef NEED_PTHREAD_WARMUP 548 my_pthread_warmup(); 549# endif 550 551# ifdef HAVE_UMASK 552 uv = umask(0); 553 if (uv) 554 umask(uv); 555 else 556 umask(022); 557# endif 558 saved_argc = argc; 559 saved_argv = argv; 560 progname = argv[0]; 561 initializing = TRUE; /* mark that we are initializing */ 562 parse_cmdline_opts(&argc, &argv); 563# ifdef DEBUG 564 debug = OPT_VALUE_SET_DEBUG_LEVEL; 565# ifdef HAVE_SETLINEBUF 566 setlinebuf(stdout); 567# endif 568# endif 569 570 if (HAVE_OPT(NOFORK) || HAVE_OPT(QUIT) 571# ifdef DEBUG 572 || debug 573# endif 574 || HAVE_OPT(SAVECONFIGQUIT)) 575 nofork = TRUE; 576 577 init_logging(progname, NLOG_SYNCMASK, TRUE); 578 /* honor -l/--logfile option to log to a file */ 579 if (HAVE_OPT(LOGFILE)) { 580 logfilename = OPT_ARG(LOGFILE); 581 syslogit = FALSE; 582 change_logfile(logfilename, FALSE); 583 } else { 584 logfilename = NULL; 585 if (nofork) 586 msyslog_term = TRUE; 587 if (HAVE_OPT(SAVECONFIGQUIT)) 588 syslogit = FALSE; 589 } 590 msyslog(LOG_NOTICE, "%s: Starting", Version); 591 592 { 593 int i; 594 char buf[1024]; /* Secret knowledge of msyslog buf length */ 595 char *cp = buf; 596 597 /* Note that every arg has an initial space character */ 598 snprintf(cp, sizeof(buf), "Command line:"); 599 cp += strlen(cp); 600 601 for (i = 0; i < saved_argc ; ++i) { 602 snprintf(cp, sizeof(buf) - (cp - buf), 603 " %s", saved_argv[i]); 604 cp += strlen(cp); 605 } 606 msyslog(LOG_INFO, "%s", buf); 607 } 608 609 /* 610 * Install trap handlers to log errors and assertion failures. 611 * Default handlers print to stderr which doesn't work if detached. 612 */ 613 isc_assertion_setcallback(assertion_failed); 614 isc_error_setfatal(library_fatal_error); 615 isc_error_setunexpected(library_unexpected_error); 616 617 /* MPE lacks the concept of root */ 618# if defined(HAVE_GETUID) && !defined(MPE) 619 uid = getuid(); 620 if (uid && !HAVE_OPT( SAVECONFIGQUIT )) { 621 msyslog_term = TRUE; 622 msyslog(LOG_ERR, 623 "must be run as root, not uid %ld", (long)uid); 624 exit(1); 625 } 626# endif 627 628/* 629 * Enable the Multi-Media Timer for Windows? 630 */ 631# ifdef SYS_WINNT 632 if (HAVE_OPT( MODIFYMMTIMER )) 633 set_mm_timer(MM_TIMER_HIRES); 634# endif 635 636#ifdef HAVE_DNSREGISTRATION 637/* 638 * Enable mDNS registrations? 639 */ 640 if (HAVE_OPT( MDNS )) { 641 mdnsreg = TRUE; 642 } 643#endif /* HAVE_DNSREGISTRATION */ 644 645 if (HAVE_OPT( NOVIRTUALIPS )) 646 listen_to_virtual_ips = 0; 647 648 /* 649 * --interface, listen on specified interfaces 650 */ 651 if (HAVE_OPT( INTERFACE )) { 652 int ifacect = STACKCT_OPT( INTERFACE ); 653 const char** ifaces = STACKLST_OPT( INTERFACE ); 654 sockaddr_u addr; 655 656 while (ifacect-- > 0) { 657 add_nic_rule( 658 is_ip_address(*ifaces, AF_UNSPEC, &addr) 659 ? MATCH_IFADDR 660 : MATCH_IFNAME, 661 *ifaces, -1, ACTION_LISTEN); 662 ifaces++; 663 } 664 } 665 666 if (HAVE_OPT( NICE )) 667 priority_done = 0; 668 669# ifdef HAVE_SCHED_SETSCHEDULER 670 if (HAVE_OPT( PRIORITY )) { 671 config_priority = OPT_VALUE_PRIORITY; 672 config_priority_override = 1; 673 priority_done = 0; 674 } 675# endif 676 677# ifdef HAVE_WORKING_FORK 678 /* make sure the FDs are initialised */ 679 pipe_fds[0] = -1; 680 pipe_fds[1] = -1; 681 do { /* 'loop' once */ 682 if (!HAVE_OPT( WAIT_SYNC )) 683 break; 684 wait_sync = OPT_VALUE_WAIT_SYNC; 685 if (wait_sync <= 0) { 686 wait_sync = 0; 687 break; 688 } 689 /* -w requires a fork() even with debug > 0 */ 690 nofork = FALSE; 691 if (pipe(pipe_fds)) { 692 exit_code = (errno) ? errno : -1; 693 msyslog(LOG_ERR, 694 "Pipe creation failed for --wait-sync: %m"); 695 exit(exit_code); 696 } 697 waitsync_fd_to_close = pipe_fds[1]; 698 } while (0); /* 'loop' once */ 699# endif /* HAVE_WORKING_FORK */ 700 701 init_lib(); 702# ifdef SYS_WINNT 703 /* 704 * Start interpolation thread, must occur before first 705 * get_systime() 706 */ 707 init_winnt_time(); 708# endif 709 /* 710 * Initialize random generator and public key pair 711 */ 712 get_systime(&now); 713 714 ntp_srandom((int)(now.l_i * now.l_uf)); 715 716 /* 717 * Detach us from the terminal. May need an #ifndef GIZMO. 718 */ 719 if (!nofork) { 720 721# ifdef HAVE_WORKING_FORK 722 rc = fork(); 723 if (-1 == rc) { 724 exit_code = (errno) ? errno : -1; 725 msyslog(LOG_ERR, "fork: %m"); 726 exit(exit_code); 727 } 728 if (rc > 0) { 729 /* parent */ 730 exit_code = wait_child_sync_if(pipe_fds[0], 731 wait_sync); 732 exit(exit_code); 733 } 734 735 /* 736 * child/daemon 737 * close all open files excepting waitsync_fd_to_close. 738 * msyslog() unreliable until after init_logging(). 739 */ 740 closelog(); 741 if (syslog_file != NULL) { 742 fclose(syslog_file); 743 syslog_file = NULL; 744 syslogit = TRUE; 745 } 746 close_all_except(waitsync_fd_to_close); 747 INSIST(0 == open("/dev/null", 0) && 1 == dup2(0, 1) \ 748 && 2 == dup2(0, 2)); 749 750 init_logging(progname, 0, TRUE); 751 /* we lost our logfile (if any) daemonizing */ 752 setup_logfile(logfilename); 753 754# ifdef SYS_DOMAINOS 755 { 756 uid_$t puid; 757 status_$t st; 758 759 proc2_$who_am_i(&puid); 760 proc2_$make_server(&puid, &st); 761 } 762# endif /* SYS_DOMAINOS */ 763# ifdef HAVE_SETSID 764 if (setsid() == (pid_t)-1) 765 msyslog(LOG_ERR, "setsid(): %m"); 766# elif defined(HAVE_SETPGID) 767 if (setpgid(0, 0) == -1) 768 msyslog(LOG_ERR, "setpgid(): %m"); 769# else /* !HAVE_SETSID && !HAVE_SETPGID follows */ 770# ifdef TIOCNOTTY 771 fid = open("/dev/tty", 2); 772 if (fid >= 0) { 773 ioctl(fid, (u_long)TIOCNOTTY, NULL); 774 close(fid); 775 } 776# endif /* TIOCNOTTY */ 777 ntp_setpgrp(0, getpid()); 778# endif /* !HAVE_SETSID && !HAVE_SETPGID */ 779# ifdef _AIX 780 /* Don't get killed by low-on-memory signal. */ 781 sa.sa_handler = catch_danger; 782 sigemptyset(&sa.sa_mask); 783 sa.sa_flags = SA_RESTART; 784 sigaction(SIGDANGER, &sa, NULL); 785# endif /* _AIX */ 786# endif /* HAVE_WORKING_FORK */ 787 } 788 789# ifdef SCO5_CLOCK 790 /* 791 * SCO OpenServer's system clock offers much more precise timekeeping 792 * on the base CPU than the other CPUs (for multiprocessor systems), 793 * so we must lock to the base CPU. 794 */ 795 fd = open("/dev/at1", O_RDONLY); 796 if (fd >= 0) { 797 zero = 0; 798 if (ioctl(fd, ACPU_LOCK, &zero) < 0) 799 msyslog(LOG_ERR, "cannot lock to base CPU: %m"); 800 close(fd); 801 } 802# endif 803 804 /* Setup stack size in preparation for locking pages in memory. */ 805# if defined(HAVE_MLOCKALL) 806# ifdef HAVE_SETRLIMIT 807 ntp_rlimit(RLIMIT_STACK, DFLT_RLIMIT_STACK * 4096, 4096, "4k"); 808# ifdef RLIMIT_MEMLOCK 809 /* 810 * The default RLIMIT_MEMLOCK is very low on Linux systems. 811 * Unless we increase this limit malloc calls are likely to 812 * fail if we drop root privilege. To be useful the value 813 * has to be larger than the largest ntpd resident set size. 814 */ 815 ntp_rlimit(RLIMIT_MEMLOCK, DFLT_RLIMIT_MEMLOCK * 1024 * 1024, 1024 * 1024, "MB"); 816# endif /* RLIMIT_MEMLOCK */ 817# endif /* HAVE_SETRLIMIT */ 818# else /* !HAVE_MLOCKALL follows */ 819# ifdef HAVE_PLOCK 820# ifdef PROCLOCK 821# ifdef _AIX 822 /* 823 * set the stack limit for AIX for plock(). 824 * see get_aix_stack() for more info. 825 */ 826 if (ulimit(SET_STACKLIM, (get_aix_stack() - 8 * 4096)) < 0) 827 msyslog(LOG_ERR, 828 "Cannot adjust stack limit for plock: %m"); 829# endif /* _AIX */ 830# endif /* PROCLOCK */ 831# endif /* HAVE_PLOCK */ 832# endif /* !HAVE_MLOCKALL */ 833 834 /* 835 * Set up signals we pay attention to locally. 836 */ 837# ifdef SIGDIE1 838 signal_no_reset(SIGDIE1, finish); 839 signal_no_reset(SIGDIE2, finish); 840 signal_no_reset(SIGDIE3, finish); 841 signal_no_reset(SIGDIE4, finish); 842# endif 843# ifdef SIGBUS 844 signal_no_reset(SIGBUS, finish); 845# endif 846 847# if !defined(SYS_WINNT) && !defined(VMS) 848# ifdef DEBUG 849 (void) signal_no_reset(MOREDEBUGSIG, moredebug); 850 (void) signal_no_reset(LESSDEBUGSIG, lessdebug); 851# else 852 (void) signal_no_reset(MOREDEBUGSIG, no_debug); 853 (void) signal_no_reset(LESSDEBUGSIG, no_debug); 854# endif /* DEBUG */ 855# endif /* !SYS_WINNT && !VMS */ 856 857 /* 858 * Set up signals we should never pay attention to. 859 */ 860# ifdef SIGPIPE 861 signal_no_reset(SIGPIPE, SIG_IGN); 862# endif 863 864 /* 865 * Call the init_ routines to initialize the data structures. 866 * 867 * Exactly what command-line options are we expecting here? 868 */ 869 INIT_SSL(); 870 init_auth(); 871 init_util(); 872 init_restrict(); 873 init_mon(); 874 init_timer(); 875 init_request(); 876 init_control(); 877 init_peer(); 878# ifdef REFCLOCK 879 init_refclock(); 880# endif 881 set_process_priority(); 882 init_proto(); /* Call at high priority */ 883 init_io(); 884 init_loopfilter(); 885 mon_start(MON_ON); /* monitor on by default now */ 886 /* turn off in config if unwanted */ 887 888 /* 889 * Get the configuration. This is done in a separate module 890 * since this will definitely be different for the gizmo board. 891 */ 892 getconfig(argc, argv); 893 894 if (-1 == cur_memlock) { 895# if defined(HAVE_MLOCKALL) 896 /* 897 * lock the process into memory 898 */ 899 if ( !HAVE_OPT(SAVECONFIGQUIT) 900# ifdef RLIMIT_MEMLOCK 901 && -1 != DFLT_RLIMIT_MEMLOCK 902# endif 903 && 0 != mlockall(MCL_CURRENT|MCL_FUTURE)) 904 msyslog(LOG_ERR, "mlockall(): %m"); 905# else /* !HAVE_MLOCKALL follows */ 906# ifdef HAVE_PLOCK 907# ifdef PROCLOCK 908 /* 909 * lock the process into memory 910 */ 911 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(PROCLOCK)) 912 msyslog(LOG_ERR, "plock(PROCLOCK): %m"); 913# else /* !PROCLOCK follows */ 914# ifdef TXTLOCK 915 /* 916 * Lock text into ram 917 */ 918 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(TXTLOCK)) 919 msyslog(LOG_ERR, "plock(TXTLOCK) error: %m"); 920# else /* !TXTLOCK follows */ 921 msyslog(LOG_ERR, "plock() - don't know what to lock!"); 922# endif /* !TXTLOCK */ 923# endif /* !PROCLOCK */ 924# endif /* HAVE_PLOCK */ 925# endif /* !HAVE_MLOCKALL */ 926 } 927 928 loop_config(LOOP_DRIFTINIT, 0); 929 report_event(EVNT_SYSRESTART, NULL, NULL); 930 initializing = FALSE; 931 932# ifdef HAVE_DROPROOT 933 if (droproot) { 934 /* Drop super-user privileges and chroot now if the OS supports this */ 935 936# ifdef HAVE_LINUX_CAPABILITIES 937 /* set flag: keep privileges accross setuid() call (we only really need cap_sys_time): */ 938 if (prctl( PR_SET_KEEPCAPS, 1L, 0L, 0L, 0L ) == -1) { 939 msyslog( LOG_ERR, "prctl( PR_SET_KEEPCAPS, 1L ) failed: %m" ); 940 exit(-1); 941 } 942# elif HAVE_SOLARIS_PRIVS 943 /* Nothing to do here */ 944# else 945 /* we need a user to switch to */ 946 if (user == NULL) { 947 msyslog(LOG_ERR, "Need user name to drop root privileges (see -u flag!)" ); 948 exit(-1); 949 } 950# endif /* HAVE_LINUX_CAPABILITIES || HAVE_SOLARIS_PRIVS */ 951 952 if (user != NULL) { 953 if (isdigit((unsigned char)*user)) { 954 sw_uid = (uid_t)strtoul(user, &endp, 0); 955 if (*endp != '\0') 956 goto getuser; 957 958 if ((pw = getpwuid(sw_uid)) != NULL) { 959 free(user); 960 user = estrdup(pw->pw_name); 961 sw_gid = pw->pw_gid; 962 } else { 963 errno = 0; 964 msyslog(LOG_ERR, "Cannot find user ID %s", user); 965 exit (-1); 966 } 967 968 } else { 969getuser: 970 errno = 0; 971 if ((pw = getpwnam(user)) != NULL) { 972 sw_uid = pw->pw_uid; 973 sw_gid = pw->pw_gid; 974 } else { 975 if (errno) 976 msyslog(LOG_ERR, "getpwnam(%s) failed: %m", user); 977 else 978 msyslog(LOG_ERR, "Cannot find user `%s'", user); 979 exit (-1); 980 } 981 } 982 } 983 if (group != NULL) { 984 if (isdigit((unsigned char)*group)) { 985 sw_gid = (gid_t)strtoul(group, &endp, 0); 986 if (*endp != '\0') 987 goto getgroup; 988 } else { 989getgroup: 990 if ((gr = getgrnam(group)) != NULL) { 991 sw_gid = gr->gr_gid; 992 } else { 993 errno = 0; 994 msyslog(LOG_ERR, "Cannot find group `%s'", group); 995 exit (-1); 996 } 997 } 998 } 999 1000 if (chrootdir ) { 1001 /* make sure cwd is inside the jail: */ 1002 if (chdir(chrootdir)) { 1003 msyslog(LOG_ERR, "Cannot chdir() to `%s': %m", chrootdir); 1004 exit (-1); 1005 } 1006 if (chroot(chrootdir)) { 1007 msyslog(LOG_ERR, "Cannot chroot() to `%s': %m", chrootdir); 1008 exit (-1); 1009 } 1010 if (chdir("/")) { 1011 msyslog(LOG_ERR, "Cannot chdir() to`root after chroot(): %m"); 1012 exit (-1); 1013 } 1014 } 1015# ifdef HAVE_SOLARIS_PRIVS 1016 if ((lowprivs = priv_str_to_set(LOWPRIVS, ",", NULL)) == NULL) { 1017 msyslog(LOG_ERR, "priv_str_to_set() failed:%m"); 1018 exit(-1); 1019 } 1020 if ((highprivs = priv_allocset()) == NULL) { 1021 msyslog(LOG_ERR, "priv_allocset() failed:%m"); 1022 exit(-1); 1023 } 1024 (void) getppriv(PRIV_PERMITTED, highprivs); 1025 (void) priv_intersect(highprivs, lowprivs); 1026 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) { 1027 msyslog(LOG_ERR, "setppriv() failed:%m"); 1028 exit(-1); 1029 } 1030# endif /* HAVE_SOLARIS_PRIVS */ 1031 if (user && initgroups(user, sw_gid)) { 1032 msyslog(LOG_ERR, "Cannot initgroups() to user `%s': %m", user); 1033 exit (-1); 1034 } 1035 if (group && setgid(sw_gid)) { 1036 msyslog(LOG_ERR, "Cannot setgid() to group `%s': %m", group); 1037 exit (-1); 1038 } 1039 if (group && setegid(sw_gid)) { 1040 msyslog(LOG_ERR, "Cannot setegid() to group `%s': %m", group); 1041 exit (-1); 1042 } 1043 if (group) { 1044 if (0 != setgroups(1, &sw_gid)) { 1045 msyslog(LOG_ERR, "setgroups(1, %d) failed: %m", sw_gid); 1046 exit (-1); 1047 } 1048 } 1049 else if (pw) 1050 if (0 != initgroups(pw->pw_name, pw->pw_gid)) { 1051 msyslog(LOG_ERR, "initgroups(<%s>, %d) filed: %m", pw->pw_name, pw->pw_gid); 1052 exit (-1); 1053 } 1054 if (user && setuid(sw_uid)) { 1055 msyslog(LOG_ERR, "Cannot setuid() to user `%s': %m", user); 1056 exit (-1); 1057 } 1058 if (user && seteuid(sw_uid)) { 1059 msyslog(LOG_ERR, "Cannot seteuid() to user `%s': %m", user); 1060 exit (-1); 1061 } 1062 1063# if !defined(HAVE_LINUX_CAPABILITIES) && !defined(HAVE_SOLARIS_PRIVS) 1064 /* 1065 * for now assume that the privilege to bind to privileged ports 1066 * is associated with running with uid 0 - should be refined on 1067 * ports that allow binding to NTP_PORT with uid != 0 1068 */ 1069 disable_dynamic_updates |= (sw_uid != 0); /* also notifies routing message listener */ 1070# endif /* !HAVE_LINUX_CAPABILITIES && !HAVE_SOLARIS_PRIVS */ 1071 1072 if (disable_dynamic_updates && interface_interval) { 1073 interface_interval = 0; 1074 msyslog(LOG_INFO, "running as non-root disables dynamic interface tracking"); 1075 } 1076 1077# ifdef HAVE_LINUX_CAPABILITIES 1078 { 1079 /* 1080 * We may be running under non-root uid now, but we still hold full root privileges! 1081 * We drop all of them, except for the crucial one or two: cap_sys_time and 1082 * cap_net_bind_service if doing dynamic interface tracking. 1083 */ 1084 cap_t caps; 1085 char *captext; 1086 1087 captext = (0 != interface_interval) 1088 ? "cap_sys_time,cap_net_bind_service=pe" 1089 : "cap_sys_time=pe"; 1090 caps = cap_from_text(captext); 1091 if (!caps) { 1092 msyslog(LOG_ERR, 1093 "cap_from_text(%s) failed: %m", 1094 captext); 1095 exit(-1); 1096 } 1097 if (-1 == cap_set_proc(caps)) { 1098 msyslog(LOG_ERR, 1099 "cap_set_proc() failed to drop root privs: %m"); 1100 exit(-1); 1101 } 1102 cap_free(caps); 1103 } 1104# endif /* HAVE_LINUX_CAPABILITIES */ 1105# ifdef HAVE_SOLARIS_PRIVS 1106 if (priv_delset(lowprivs, "proc_setid") == -1) { 1107 msyslog(LOG_ERR, "priv_delset() failed:%m"); 1108 exit(-1); 1109 } 1110 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) { 1111 msyslog(LOG_ERR, "setppriv() failed:%m"); 1112 exit(-1); 1113 } 1114 priv_freeset(lowprivs); 1115 priv_freeset(highprivs); 1116# endif /* HAVE_SOLARIS_PRIVS */ 1117 root_dropped = TRUE; 1118 fork_deferred_worker(); 1119 } /* if (droproot) */ 1120# endif /* HAVE_DROPROOT */ 1121 1122/* libssecomp sandboxing */ 1123#if defined (LIBSECCOMP) && (KERN_SECCOMP) 1124 scmp_filter_ctx ctx; 1125 1126 if ((ctx = seccomp_init(SCMP_ACT_KILL)) < 0) 1127 msyslog(LOG_ERR, "%s: seccomp_init(SCMP_ACT_KILL) failed: %m", __func__); 1128 else { 1129 msyslog(LOG_DEBUG, "%s: seccomp_init(SCMP_ACT_KILL) succeeded", __func__); 1130 } 1131 1132#ifdef __x86_64__ 1133int scmp_sc[] = { 1134 SCMP_SYS(adjtimex), 1135 SCMP_SYS(bind), 1136 SCMP_SYS(brk), 1137 SCMP_SYS(chdir), 1138 SCMP_SYS(clock_gettime), 1139 SCMP_SYS(clock_settime), 1140 SCMP_SYS(close), 1141 SCMP_SYS(connect), 1142 SCMP_SYS(exit_group), 1143 SCMP_SYS(fstat), 1144 SCMP_SYS(fsync), 1145 SCMP_SYS(futex), 1146 SCMP_SYS(getitimer), 1147 SCMP_SYS(getsockname), 1148 SCMP_SYS(ioctl), 1149 SCMP_SYS(lseek), 1150 SCMP_SYS(madvise), 1151 SCMP_SYS(mmap), 1152 SCMP_SYS(munmap), 1153 SCMP_SYS(open), 1154 SCMP_SYS(poll), 1155 SCMP_SYS(read), 1156 SCMP_SYS(recvmsg), 1157 SCMP_SYS(rename), 1158 SCMP_SYS(rt_sigaction), 1159 SCMP_SYS(rt_sigprocmask), 1160 SCMP_SYS(rt_sigreturn), 1161 SCMP_SYS(select), 1162 SCMP_SYS(sendto), 1163 SCMP_SYS(setitimer), 1164 SCMP_SYS(setsid), 1165 SCMP_SYS(socket), 1166 SCMP_SYS(stat), 1167 SCMP_SYS(time), 1168 SCMP_SYS(write), 1169}; 1170#endif 1171#ifdef __i386__ 1172int scmp_sc[] = { 1173 SCMP_SYS(_newselect), 1174 SCMP_SYS(adjtimex), 1175 SCMP_SYS(brk), 1176 SCMP_SYS(chdir), 1177 SCMP_SYS(clock_gettime), 1178 SCMP_SYS(clock_settime), 1179 SCMP_SYS(close), 1180 SCMP_SYS(exit_group), 1181 SCMP_SYS(fsync), 1182 SCMP_SYS(futex), 1183 SCMP_SYS(getitimer), 1184 SCMP_SYS(madvise), 1185 SCMP_SYS(mmap), 1186 SCMP_SYS(mmap2), 1187 SCMP_SYS(munmap), 1188 SCMP_SYS(open), 1189 SCMP_SYS(poll), 1190 SCMP_SYS(read), 1191 SCMP_SYS(rename), 1192 SCMP_SYS(rt_sigaction), 1193 SCMP_SYS(rt_sigprocmask), 1194 SCMP_SYS(select), 1195 SCMP_SYS(setitimer), 1196 SCMP_SYS(setsid), 1197 SCMP_SYS(sigprocmask), 1198 SCMP_SYS(sigreturn), 1199 SCMP_SYS(socketcall), 1200 SCMP_SYS(stat64), 1201 SCMP_SYS(time), 1202 SCMP_SYS(write), 1203}; 1204#endif 1205 { 1206 int i; 1207 1208 for (i = 0; i < COUNTOF(scmp_sc); i++) { 1209 if (seccomp_rule_add(ctx, 1210 SCMP_ACT_ALLOW, scmp_sc[i], 0) < 0) { 1211 msyslog(LOG_ERR, 1212 "%s: seccomp_rule_add() failed: %m", 1213 __func__); 1214 } 1215 } 1216 } 1217 1218 if (seccomp_load(ctx) < 0) 1219 msyslog(LOG_ERR, "%s: seccomp_load() failed: %m", 1220 __func__); 1221 else { 1222 msyslog(LOG_DEBUG, "%s: seccomp_load() succeeded", __func__); 1223 } 1224#endif /* LIBSECCOMP and KERN_SECCOMP */ 1225 1226# ifdef HAVE_IO_COMPLETION_PORT 1227 1228 for (;;) { 1229#if !defined(SIM) && defined(SIGDIE1) 1230 if (signalled) 1231 finish_safe(signo); 1232#endif 1233 GetReceivedBuffers(); 1234# else /* normal I/O */ 1235 1236 BLOCK_IO_AND_ALARM(); 1237 was_alarmed = FALSE; 1238 1239 for (;;) { 1240#if !defined(SIM) && defined(SIGDIE1) 1241 if (signalled) 1242 finish_safe(signo); 1243#endif 1244 if (alarm_flag) { /* alarmed? */ 1245 was_alarmed = TRUE; 1246 alarm_flag = FALSE; 1247 } 1248 1249 /* collect async name/addr results */ 1250 if (!was_alarmed) 1251 harvest_blocking_responses(); 1252 1253 if (!was_alarmed && !has_full_recv_buffer()) { 1254 /* 1255 * Nothing to do. Wait for something. 1256 */ 1257 io_handler(); 1258 } 1259 1260 if (alarm_flag) { /* alarmed? */ 1261 was_alarmed = TRUE; 1262 alarm_flag = FALSE; 1263 } 1264 1265 if (was_alarmed) { 1266 UNBLOCK_IO_AND_ALARM(); 1267 /* 1268 * Out here, signals are unblocked. Call timer routine 1269 * to process expiry. 1270 */ 1271 timer(); 1272 was_alarmed = FALSE; 1273 BLOCK_IO_AND_ALARM(); 1274 } 1275 1276# endif /* !HAVE_IO_COMPLETION_PORT */ 1277 1278# ifdef DEBUG_TIMING 1279 { 1280 l_fp pts; 1281 l_fp tsa, tsb; 1282 int bufcount = 0; 1283 1284 get_systime(&pts); 1285 tsa = pts; 1286# endif 1287 rbuf = get_full_recv_buffer(); 1288 while (rbuf != NULL) { 1289 if (alarm_flag) { 1290 was_alarmed = TRUE; 1291 alarm_flag = FALSE; 1292 } 1293 UNBLOCK_IO_AND_ALARM(); 1294 1295 if (was_alarmed) { 1296 /* avoid timer starvation during lengthy I/O handling */ 1297 timer(); 1298 was_alarmed = FALSE; 1299 } 1300 1301 /* 1302 * Call the data procedure to handle each received 1303 * packet. 1304 */ 1305 if (rbuf->receiver != NULL) { 1306# ifdef DEBUG_TIMING 1307 l_fp dts = pts; 1308 1309 L_SUB(&dts, &rbuf->recv_time); 1310 DPRINTF(2, ("processing timestamp delta %s (with prec. fuzz)\n", lfptoa(&dts, 9))); 1311 collect_timing(rbuf, "buffer processing delay", 1, &dts); 1312 bufcount++; 1313# endif 1314 (*rbuf->receiver)(rbuf); 1315 } else { 1316 msyslog(LOG_ERR, "fatal: receive buffer callback NULL"); 1317 abort(); 1318 } 1319 1320 BLOCK_IO_AND_ALARM(); 1321 freerecvbuf(rbuf); 1322 rbuf = get_full_recv_buffer(); 1323 } 1324# ifdef DEBUG_TIMING 1325 get_systime(&tsb); 1326 L_SUB(&tsb, &tsa); 1327 if (bufcount) { 1328 collect_timing(NULL, "processing", bufcount, &tsb); 1329 DPRINTF(2, ("processing time for %d buffers %s\n", bufcount, lfptoa(&tsb, 9))); 1330 } 1331 } 1332# endif 1333 1334 /* 1335 * Go around again 1336 */ 1337 1338# ifdef HAVE_DNSREGISTRATION 1339 if (mdnsreg && (current_time - mdnsreg ) > 60 && mdnstries && sys_leap != LEAP_NOTINSYNC) { 1340 mdnsreg = current_time; 1341 msyslog(LOG_INFO, "Attempting to register mDNS"); 1342 if ( DNSServiceRegister (&mdns, 0, 0, NULL, "_ntp._udp", NULL, NULL, 1343 htons(NTP_PORT), 0, NULL, NULL, NULL) != kDNSServiceErr_NoError ) { 1344 if (!--mdnstries) { 1345 msyslog(LOG_ERR, "Unable to register mDNS, giving up."); 1346 } else { 1347 msyslog(LOG_INFO, "Unable to register mDNS, will try later."); 1348 } 1349 } else { 1350 msyslog(LOG_INFO, "mDNS service registered."); 1351 mdnsreg = FALSE; 1352 } 1353 } 1354# endif /* HAVE_DNSREGISTRATION */ 1355 1356 } 1357 UNBLOCK_IO_AND_ALARM(); 1358 return 1; 1359} 1360#endif /* !SIM */ 1361 1362 1363#if !defined(SIM) && defined(SIGDIE1) 1364/* 1365 * finish - exit gracefully 1366 */ 1367static void 1368finish_safe( 1369 int sig 1370 ) 1371{ 1372 const char *sig_desc; 1373 1374 sig_desc = NULL; 1375#ifdef HAVE_STRSIGNAL 1376 sig_desc = strsignal(sig); 1377#endif 1378 if (sig_desc == NULL) 1379 sig_desc = ""; 1380 msyslog(LOG_NOTICE, "%s exiting on signal %d (%s)", progname, 1381 sig, sig_desc); 1382 /* See Bug 2513 and Bug 2522 re the unlink of PIDFILE */ 1383# ifdef HAVE_DNSREGISTRATION 1384 if (mdns != NULL) 1385 DNSServiceRefDeallocate(mdns); 1386# endif 1387 peer_cleanup(); 1388 exit(0); 1389} 1390 1391static RETSIGTYPE 1392finish( 1393 int sig 1394 ) 1395{ 1396 signalled = 1; 1397 signo = sig; 1398} 1399 1400#endif /* !SIM && SIGDIE1 */ 1401 1402 1403#ifndef SIM 1404/* 1405 * wait_child_sync_if - implements parent side of -w/--wait-sync 1406 */ 1407# ifdef HAVE_WORKING_FORK 1408static int 1409wait_child_sync_if( 1410 int pipe_read_fd, 1411 long wait_sync 1412 ) 1413{ 1414 int rc; 1415 int exit_code; 1416 time_t wait_end_time; 1417 time_t cur_time; 1418 time_t wait_rem; 1419 fd_set readset; 1420 struct timeval wtimeout; 1421 1422 if (0 == wait_sync) 1423 return 0; 1424 1425 /* waitsync_fd_to_close used solely by child */ 1426 close(waitsync_fd_to_close); 1427 wait_end_time = time(NULL) + wait_sync; 1428 do { 1429 cur_time = time(NULL); 1430 wait_rem = (wait_end_time > cur_time) 1431 ? (wait_end_time - cur_time) 1432 : 0; 1433 wtimeout.tv_sec = wait_rem; 1434 wtimeout.tv_usec = 0; 1435 FD_ZERO(&readset); 1436 FD_SET(pipe_read_fd, &readset); 1437 rc = select(pipe_read_fd + 1, &readset, NULL, NULL, 1438 &wtimeout); 1439 if (-1 == rc) { 1440 if (EINTR == errno) 1441 continue; 1442 exit_code = (errno) ? errno : -1; 1443 msyslog(LOG_ERR, 1444 "--wait-sync select failed: %m"); 1445 return exit_code; 1446 } 1447 if (0 == rc) { 1448 /* 1449 * select() indicated a timeout, but in case 1450 * its timeouts are affected by a step of the 1451 * system clock, select() again with a zero 1452 * timeout to confirm. 1453 */ 1454 FD_ZERO(&readset); 1455 FD_SET(pipe_read_fd, &readset); 1456 wtimeout.tv_sec = 0; 1457 wtimeout.tv_usec = 0; 1458 rc = select(pipe_read_fd + 1, &readset, NULL, 1459 NULL, &wtimeout); 1460 if (0 == rc) /* select() timeout */ 1461 break; 1462 else /* readable */ 1463 return 0; 1464 } else /* readable */ 1465 return 0; 1466 } while (wait_rem > 0); 1467 1468 fprintf(stderr, "%s: -w/--wait-sync %ld timed out.\n", 1469 progname, wait_sync); 1470 return ETIMEDOUT; 1471} 1472# endif /* HAVE_WORKING_FORK */ 1473 1474 1475/* 1476 * assertion_failed - Redirect assertion failures to msyslog(). 1477 */ 1478static void 1479assertion_failed( 1480 const char *file, 1481 int line, 1482 isc_assertiontype_t type, 1483 const char *cond 1484 ) 1485{ 1486 isc_assertion_setcallback(NULL); /* Avoid recursion */ 1487 1488 msyslog(LOG_ERR, "%s:%d: %s(%s) failed", 1489 file, line, isc_assertion_typetotext(type), cond); 1490 msyslog(LOG_ERR, "exiting (due to assertion failure)"); 1491 1492#if defined(DEBUG) && defined(SYS_WINNT) 1493 if (debug) 1494 DebugBreak(); 1495#endif 1496 1497 abort(); 1498} 1499 1500 1501/* 1502 * library_fatal_error - Handle fatal errors from our libraries. 1503 */ 1504static void 1505library_fatal_error( 1506 const char *file, 1507 int line, 1508 const char *format, 1509 va_list args 1510 ) 1511{ 1512 char errbuf[256]; 1513 1514 isc_error_setfatal(NULL); /* Avoid recursion */ 1515 1516 msyslog(LOG_ERR, "%s:%d: fatal error:", file, line); 1517 vsnprintf(errbuf, sizeof(errbuf), format, args); 1518 msyslog(LOG_ERR, "%s", errbuf); 1519 msyslog(LOG_ERR, "exiting (due to fatal error in library)"); 1520 1521#if defined(DEBUG) && defined(SYS_WINNT) 1522 if (debug) 1523 DebugBreak(); 1524#endif 1525 1526 abort(); 1527} 1528 1529 1530/* 1531 * library_unexpected_error - Handle non fatal errors from our libraries. 1532 */ 1533# define MAX_UNEXPECTED_ERRORS 100 1534int unexpected_error_cnt = 0; 1535static void 1536library_unexpected_error( 1537 const char *file, 1538 int line, 1539 const char *format, 1540 va_list args 1541 ) 1542{ 1543 char errbuf[256]; 1544 1545 if (unexpected_error_cnt >= MAX_UNEXPECTED_ERRORS) 1546 return; /* avoid clutter in log */ 1547 1548 msyslog(LOG_ERR, "%s:%d: unexpected error:", file, line); 1549 vsnprintf(errbuf, sizeof(errbuf), format, args); 1550 msyslog(LOG_ERR, "%s", errbuf); 1551 1552 if (++unexpected_error_cnt == MAX_UNEXPECTED_ERRORS) 1553 msyslog(LOG_ERR, "Too many errors. Shutting up."); 1554 1555} 1556#endif /* !SIM */ 1557 1558#if !defined(SIM) && !defined(SYS_WINNT) 1559# ifdef DEBUG 1560 1561/* 1562 * moredebug - increase debugging verbosity 1563 */ 1564static RETSIGTYPE 1565moredebug( 1566 int sig 1567 ) 1568{ 1569 int saved_errno = errno; 1570 1571 if (debug < 255) 1572 { 1573 debug++; 1574 msyslog(LOG_DEBUG, "debug raised to %d", debug); 1575 } 1576 errno = saved_errno; 1577} 1578 1579 1580/* 1581 * lessdebug - decrease debugging verbosity 1582 */ 1583static RETSIGTYPE 1584lessdebug( 1585 int sig 1586 ) 1587{ 1588 int saved_errno = errno; 1589 1590 if (debug > 0) 1591 { 1592 debug--; 1593 msyslog(LOG_DEBUG, "debug lowered to %d", debug); 1594 } 1595 errno = saved_errno; 1596} 1597 1598# else /* !DEBUG follows */ 1599 1600 1601/* 1602 * no_debug - We don't do the debug here. 1603 */ 1604static RETSIGTYPE 1605no_debug( 1606 int sig 1607 ) 1608{ 1609 int saved_errno = errno; 1610 1611 msyslog(LOG_DEBUG, "ntpd not compiled for debugging (signal %d)", sig); 1612 errno = saved_errno; 1613} 1614# endif /* !DEBUG */ 1615#endif /* !SIM && !SYS_WINNT */ 1616