contrib/ntp/ntpd/ntpd.c

   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>
 136 DNSServiceRef 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"
 147 static priv_set_t *lowprivs = NULL;
 148 static priv_set_t *highprivs = NULL;
 149 #endif /* HAVE_SOLARIS_PRIVS */
 150 /*
 151  * Scheduling priority we run at
 152  */
 153 #define NTPD_PRIO       (-12)
 154
 155 int 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
 160 int listen_to_virtual_ips = TRUE;
 161
 162 /*
 163  * No-fork flag.  If set, we do not become a background daemon.
 164  */
 165 int 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  */
 173 int mdnsreg = FALSE;
 174 int mdnstries = 5;
 175 #endif  /* HAVE_DNSREGISTRATION */
 176
 177 #ifdef HAVE_DROPROOT
 178 int droproot;
 179 int root_dropped;
 180 char *user;             /* User to switch to */
 181 char *group;            /* group to switch to */
 182 const char *chrootdir;  /* directory to chroot to */
 183 uid_t sw_uid;
 184 gid_t sw_gid;
 185 char *endp;
 186 struct group *gr;
 187 struct passwd *pw;
 188 #endif /* HAVE_DROPROOT */
 189
 190 #ifdef HAVE_WORKING_FORK
 191 int     waitsync_fd_to_close = -1;      /* -w/--wait-sync */
 192 #endif
 193
 194 /*
 195  * Version declaration
 196  */
 197 extern const char *Version;
 198
 199 char const *progname;
 200
 201 int was_alarmed;
 202
 203 #ifdef DECL_SYSCALL
 204 /*
 205  * We put this here, since the argument profile is syscall-specific
 206  */
 207 extern int syscall      (int, ...);
 208 #endif /* DECL_SYSCALL */
 209
 210
 211 #if !defined(SIM) && defined(SIGDIE1)
 212 static volatile int signalled   = 0;
 213 static volatile int signo       = 0;
 214
 215 /* In an ideal world, 'finish_safe()' would declared as noreturn... */
 216 static  void            finish_safe     (int);
 217 static  RETSIGTYPE      finish          (int);
 218 #endif
 219
 220 #if !defined(SIM) && defined(HAVE_WORKING_FORK)
 221 static int      wait_child_sync_if      (int, long);
 222 #endif
 223
 224 #if !defined(SIM) && !defined(SYS_WINNT)
 225 # ifdef DEBUG
 226 static  RETSIGTYPE      moredebug       (int);
 227 static  RETSIGTYPE      lessdebug       (int);
 228 # else  /* !DEBUG follows */
 229 static  RETSIGTYPE      no_debug        (int);
 230 # endif /* !DEBUG */
 231 #endif  /* !SIM && !SYS_WINNT */
 232
 233 #ifndef WORK_FORK
 234 int     saved_argc;
 235 char ** saved_argv;
 236 #endif
 237
 238 #ifndef SIM
 239 int             ntpdmain                (int, char **);
 240 static void     set_process_priority    (void);
 241 static void     assertion_failed        (const char *, int,
 242                                          isc_assertiontype_t,
 243                                          const char *)
 244                         __attribute__   ((__noreturn__));
 245 static void     library_fatal_error     (const char *, int,
 246                                          const char *, va_list)
 247                                         ISC_FORMAT_PRINTF(3, 0);
 248 static void     library_unexpected_error(const char *, int,
 249                                          const char *, va_list)
 250                                         ISC_FORMAT_PRINTF(3, 0);
 251 #endif  /* !SIM */
 252
 253
 254 /* Bug2332 unearthed a problem in the interaction of reduced user
 255  * privileges, the limits on memory usage and some versions of the
 256  * pthread library on Linux systems. The 'pthread_cancel()' function and
 257  * likely some others need to track the stack of the thread involved,
 258  * and uses a function that comes from GCC (--> libgcc_s.so) to do
 259  * this. Unfortunately the developers of glibc decided to load the
 260  * library on demand, which speeds up program start but can cause
 261  * trouble here: Due to all the things NTPD does to limit its resource
 262  * usage, this deferred load of libgcc_s does not always work once the
 263  * restrictions are in effect.
 264  *
 265  * One way out of this was attempting a forced link against libgcc_s
 266  * when possible because it makes the library available immediately
 267  * without deferred load. (The symbol resolution would still be dynamic
 268  * and on demand, but the code would already be in the process image.)
 269  *
 270  * This is a tricky thing to do, since it's not necessary everywhere,
 271  * not possible everywhere, has shown to break the build of other
 272  * programs in the NTP suite and is now generally frowned upon.
 273  *
 274  * So we take a different approach here: We creat a worker thread that does
 275  * actually nothing except waiting for cancellation and cancel it. If
 276  * this is done before all the limitations are put in place, the
 277  * machinery is pre-heated and all the runtime stuff should be in place
 278  * and useable when needed.
 279  *
 280  * This uses only the standard pthread API and should work with all
 281  * implementations of pthreads. It is not necessary everywhere, but it's
 282  * cheap enough to go on nearly unnoticed.
 283  *
 284  * Addendum: Bug 2954 showed that the assumption that this should work
 285  * with all OS is wrong -- at least FreeBSD bombs heavily.
 286  */
 287 #ifdef NEED_PTHREAD_WARMUP
 288
 289 /* simple thread function: sleep until cancelled, just to exercise
 290  * thread cancellation.
 291  */
 292 static void*
 293 my_pthread_warmup_worker(
 294         void *thread_args)
 295 {
 296         (void)thread_args;
 297         for (;;)
 298                 sleep(10);
 299         return NULL;
 300 }
 301
 302 /* pre-heat threading: create a thread and cancel it, just to exercise
 303  * thread cancellation.
 304  */
 305 static void
 306 my_pthread_warmup(void)
 307 {
 308         pthread_t       thread;
 309         pthread_attr_t  thr_attr;
 310         int             rc;
 311
 312         pthread_attr_init(&thr_attr);
 313 #if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \
 314     defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && \
 315     defined(PTHREAD_STACK_MIN)
 316         rc = pthread_attr_setstacksize(&thr_attr, PTHREAD_STACK_MIN);
 317         if (0 != rc)
 318                 msyslog(LOG_ERR,
 319                         "my_pthread_warmup: pthread_attr_setstacksize() -> %s",
 320                         strerror(rc));
 321 #endif
 322         rc = pthread_create(
 323                 &thread, &thr_attr, my_pthread_warmup_worker, NULL);
 324         pthread_attr_destroy(&thr_attr);
 325         if (0 != rc) {
 326                 msyslog(LOG_ERR,
 327                         "my_pthread_warmup: pthread_create() -> %s",
 328                         strerror(rc));
 329         } else {
 330                 pthread_cancel(thread);
 331                 pthread_join(thread, NULL);
 332         }
 333 }
 334
 335 #endif /*defined(NEED_PTHREAD_WARMUP)*/
 336
 337 #ifdef NEED_EARLY_FORK
 338 static void
 339 dummy_callback(void) { return; }
 340
 341 static void
 342 fork_nonchroot_worker(void) {
 343         getaddrinfo_sometime("localhost", "ntp", NULL, INITIAL_DNS_RETRY,
 344                              (gai_sometime_callback)&dummy_callback, NULL);
 345 }
 346 #endif /* NEED_EARLY_FORK */
 347
 348 void
 349 parse_cmdline_opts(
 350         int *   pargc,
 351         char ***pargv
 352         )
 353 {
 354         static int      parsed;
 355         static int      optct;
 356
 357         if (!parsed)
 358                 optct = ntpOptionProcess(&ntpdOptions, *pargc, *pargv);
 359
 360         parsed = 1;
 361
 362         *pargc -= optct;
 363         *pargv += optct;
 364 }
 365
 366
 367 #ifdef SIM
 368 int
 369 main(
 370         int argc,
 371         char *argv[]
 372         )
 373 {
 374         progname = argv[0];
 375         parse_cmdline_opts(&argc, &argv);
 376 #ifdef DEBUG
 377         debug = OPT_VALUE_SET_DEBUG_LEVEL;
 378         DPRINTF(1, ("%s\n", Version));
 379 #endif
 380
 381         return ntpsim(argc, argv);
 382 }
 383 #else   /* !SIM follows */
 384 #ifdef NO_MAIN_ALLOWED
 385 CALL(ntpd,"ntpd",ntpdmain);
 386 #else   /* !NO_MAIN_ALLOWED follows */
 387 #ifndef SYS_WINNT
 388 int
 389 main(
 390         int argc,
 391         char *argv[]
 392         )
 393 {
 394         return ntpdmain(argc, argv);
 395 }
 396 #endif /* !SYS_WINNT */
 397 #endif /* !NO_MAIN_ALLOWED */
 398 #endif /* !SIM */
 399
 400 #ifdef _AIX
 401 /*
 402  * OK. AIX is different than solaris in how it implements plock().
 403  * If you do NOT adjust the stack limit, you will get the MAXIMUM
 404  * stack size allocated and PINNED with you program. To check the
 405  * value, use ulimit -a.
 406  *
 407  * To fix this, we create an automatic variable and set our stack limit
 408  * to that PLUS 32KB of extra space (we need some headroom).
 409  *
 410  * This subroutine gets the stack address.
 411  *
 412  * Grover Davidson and Matt Ladendorf
 413  *
 414  */
 415 static char *
 416 get_aix_stack(void)
 417 {
 418         char ch;
 419         return (&ch);
 420 }
 421
 422 /*
 423  * Signal handler for SIGDANGER.
 424  */
 425 static void
 426 catch_danger(int signo)
 427 {
 428         msyslog(LOG_INFO, "ntpd: setpgid(): %m");
 429         /* Make the system believe we'll free something, but don't do it! */
 430         return;
 431 }
 432 #endif /* _AIX */
 433
 434 /*
 435  * Set the process priority
 436  */
 437 #ifndef SIM
 438 static void
 439 set_process_priority(void)
 440 {
 441
 442 # ifdef DEBUG
 443         if (debug > 1)
 444                 msyslog(LOG_DEBUG, "set_process_priority: %s: priority_done is <%d>",
 445                         ((priority_done)
 446                          ? "Leave priority alone"
 447                          : "Attempt to set priority"
 448                                 ),
 449                         priority_done);
 450 # endif /* DEBUG */
 451
 452 # if defined(HAVE_SCHED_SETSCHEDULER)
 453         if (!priority_done) {
 454                 extern int config_priority_override, config_priority;
 455                 int pmax, pmin;
 456                 struct sched_param sched;
 457
 458                 pmax = sched_get_priority_max(SCHED_FIFO);
 459                 sched.sched_priority = pmax;
 460                 if ( config_priority_override ) {
 461                         pmin = sched_get_priority_min(SCHED_FIFO);
 462                         if ( config_priority > pmax )
 463                                 sched.sched_priority = pmax;
 464                         else if ( config_priority < pmin )
 465                                 sched.sched_priority = pmin;
 466                         else
 467                                 sched.sched_priority = config_priority;
 468                 }
 469                 if ( sched_setscheduler(0, SCHED_FIFO, &sched) == -1 )
 470                         msyslog(LOG_ERR, "sched_setscheduler(): %m");
 471                 else
 472                         ++priority_done;
 473         }
 474 # endif /* HAVE_SCHED_SETSCHEDULER */
 475 # ifdef HAVE_RTPRIO
 476 #  ifdef RTP_SET
 477         if (!priority_done) {
 478                 struct rtprio srtp;
 479
 480                 srtp.type = RTP_PRIO_REALTIME;  /* was: RTP_PRIO_NORMAL */
 481                 srtp.prio = 0;          /* 0 (hi) -> RTP_PRIO_MAX (31,lo) */
 482
 483                 if (rtprio(RTP_SET, getpid(), &srtp) < 0)
 484                         msyslog(LOG_ERR, "rtprio() error: %m");
 485                 else
 486                         ++priority_done;
 487         }
 488 #  else /* !RTP_SET follows */
 489         if (!priority_done) {
 490                 if (rtprio(0, 120) < 0)
 491                         msyslog(LOG_ERR, "rtprio() error: %m");
 492                 else
 493                         ++priority_done;
 494         }
 495 #  endif        /* !RTP_SET */
 496 # endif /* HAVE_RTPRIO */
 497 # if defined(NTPD_PRIO) && NTPD_PRIO != 0
 498 #  ifdef HAVE_ATT_NICE
 499         if (!priority_done) {
 500                 errno = 0;
 501                 if (-1 == nice (NTPD_PRIO) && errno != 0)
 502                         msyslog(LOG_ERR, "nice() error: %m");
 503                 else
 504                         ++priority_done;
 505         }
 506 #  endif        /* HAVE_ATT_NICE */
 507 #  ifdef HAVE_BSD_NICE
 508         if (!priority_done) {
 509                 if (-1 == setpriority(PRIO_PROCESS, 0, NTPD_PRIO))
 510                         msyslog(LOG_ERR, "setpriority() error: %m");
 511                 else
 512                         ++priority_done;
 513         }
 514 #  endif        /* HAVE_BSD_NICE */
 515 # endif /* NTPD_PRIO && NTPD_PRIO != 0 */
 516         if (!priority_done)
 517                 msyslog(LOG_ERR, "set_process_priority: No way found to improve our priority");
 518 }
 519 #endif  /* !SIM */
 520
 521
 522 /*
 523  * Main program.  Initialize us, disconnect us from the tty if necessary,
 524  * and loop waiting for I/O and/or timer expiries.
 525  */
 526 #ifndef SIM
 527 int
 528 ntpdmain(
 529         int argc,
 530         char *argv[]
 531         )
 532 {
 533         l_fp            now;
 534         struct recvbuf *rbuf;
 535         const char *    logfilename;
 536 # ifdef HAVE_UMASK
 537         mode_t          uv;
 538 # endif
 539 # if defined(HAVE_GETUID) && !defined(MPE) /* MPE lacks the concept of root */
 540         uid_t           uid;
 541 # endif
 542 # if defined(HAVE_WORKING_FORK)
 543         long            wait_sync = 0;
 544         int             pipe_fds[2];
 545         int             rc;
 546         int             exit_code;
 547 #  ifdef _AIX
 548         struct sigaction sa;
 549 #  endif
 550 #  if !defined(HAVE_SETSID) && !defined (HAVE_SETPGID) && defined(TIOCNOTTY)
 551         int             fid;
 552 #  endif
 553 # endif /* HAVE_WORKING_FORK*/
 554 # ifdef SCO5_CLOCK
 555         int             fd;
 556         int             zero;
 557 # endif
 558
 559 # ifdef NEED_PTHREAD_WARMUP
 560         my_pthread_warmup();
 561 # endif
 562
 563 # ifdef HAVE_UMASK
 564         uv = umask(0);
 565         if (uv)
 566                 umask(uv);
 567         else
 568                 umask(022);
 569 # endif
 570         saved_argc = argc;
 571         saved_argv = argv;
 572         progname = argv[0];
 573         initializing = TRUE;            /* mark that we are initializing */
 574         parse_cmdline_opts(&argc, &argv);
 575 # ifdef DEBUG
 576         debug = OPT_VALUE_SET_DEBUG_LEVEL;
 577 #  ifdef HAVE_SETLINEBUF
 578         setlinebuf(stdout);
 579 #  endif
 580 # endif
 581
 582         if (HAVE_OPT(NOFORK) || HAVE_OPT(QUIT)
 583 # ifdef DEBUG
 584             || debug
 585 # endif
 586             || HAVE_OPT(SAVECONFIGQUIT))
 587                 nofork = TRUE;
 588
 589         init_logging(progname, NLOG_SYNCMASK, TRUE);
 590         /* honor -l/--logfile option to log to a file */
 591         if (HAVE_OPT(LOGFILE)) {
 592                 logfilename = OPT_ARG(LOGFILE);
 593                 syslogit = FALSE;
 594                 change_logfile(logfilename, FALSE);
 595         } else {
 596                 logfilename = NULL;
 597                 if (nofork)
 598                         msyslog_term = TRUE;
 599                 if (HAVE_OPT(SAVECONFIGQUIT))
 600                         syslogit = FALSE;
 601         }
 602         msyslog(LOG_NOTICE, "%s: Starting", Version);
 603
 604         {
 605                 int i;
 606                 char buf[1024]; /* Secret knowledge of msyslog buf length */
 607                 char *cp = buf;
 608
 609                 /* Note that every arg has an initial space character */
 610                 snprintf(cp, sizeof(buf), "Command line:");
 611                 cp += strlen(cp);
 612
 613                 for (i = 0; i < saved_argc ; ++i) {
 614                         snprintf(cp, sizeof(buf) - (cp - buf),
 615                                 " %s", saved_argv[i]);
 616                         cp += strlen(cp);
 617                 }
 618                 msyslog(LOG_INFO, "%s", buf);
 619         }
 620
 621         /*
 622          * Install trap handlers to log errors and assertion failures.
 623          * Default handlers print to stderr which doesn't work if detached.
 624          */
 625         isc_assertion_setcallback(assertion_failed);
 626         isc_error_setfatal(library_fatal_error);
 627         isc_error_setunexpected(library_unexpected_error);
 628
 629         /* MPE lacks the concept of root */
 630 # if defined(HAVE_GETUID) && !defined(MPE)
 631         uid = getuid();
 632         if (uid && !HAVE_OPT( SAVECONFIGQUIT )) {
 633                 msyslog_term = TRUE;
 634                 msyslog(LOG_ERR,
 635                         "must be run as root, not uid %ld", (long)uid);
 636                 exit(1);
 637         }
 638 # endif
 639
 640 /*
 641  * Enable the Multi-Media Timer for Windows?
 642  */
 643 # ifdef SYS_WINNT
 644         if (HAVE_OPT( MODIFYMMTIMER ))
 645                 set_mm_timer(MM_TIMER_HIRES);
 646 # endif
 647
 648 #ifdef HAVE_DNSREGISTRATION
 649 /*
 650  * Enable mDNS registrations?
 651  */
 652         if (HAVE_OPT( MDNS )) {
 653                 mdnsreg = TRUE;
 654         }
 655 #endif  /* HAVE_DNSREGISTRATION */
 656
 657         if (HAVE_OPT( NOVIRTUALIPS ))
 658                 listen_to_virtual_ips = 0;
 659
 660         /*
 661          * --interface, listen on specified interfaces
 662          */
 663         if (HAVE_OPT( INTERFACE )) {
 664                 int             ifacect = STACKCT_OPT( INTERFACE );
 665                 const char**    ifaces  = STACKLST_OPT( INTERFACE );
 666                 sockaddr_u      addr;
 667
 668                 while (ifacect-- > 0) {
 669                         add_nic_rule(
 670                                 is_ip_address(*ifaces, AF_UNSPEC, &addr)
 671                                         ? MATCH_IFADDR
 672                                         : MATCH_IFNAME,
 673                                 *ifaces, -1, ACTION_LISTEN);
 674                         ifaces++;
 675                 }
 676         }
 677
 678         if (HAVE_OPT( NICE ))
 679                 priority_done = 0;
 680
 681 # ifdef HAVE_SCHED_SETSCHEDULER
 682         if (HAVE_OPT( PRIORITY )) {
 683                 config_priority = OPT_VALUE_PRIORITY;
 684                 config_priority_override = 1;
 685                 priority_done = 0;
 686         }
 687 # endif
 688
 689 # ifdef HAVE_WORKING_FORK
 690         /* make sure the FDs are initialised */
 691         pipe_fds[0] = -1;
 692         pipe_fds[1] = -1;
 693         do {                                    /* 'loop' once */
 694                 if (!HAVE_OPT( WAIT_SYNC ))
 695                         break;
 696                 wait_sync = OPT_VALUE_WAIT_SYNC;
 697                 if (wait_sync <= 0) {
 698                         wait_sync = 0;
 699                         break;
 700                 }
 701                 /* -w requires a fork() even with debug > 0 */
 702                 nofork = FALSE;
 703                 if (pipe(pipe_fds)) {
 704                         exit_code = (errno) ? errno : -1;
 705                         msyslog(LOG_ERR,
 706                                 "Pipe creation failed for --wait-sync: %m");
 707                         exit(exit_code);
 708                 }
 709                 waitsync_fd_to_close = pipe_fds[1];
 710         } while (0);                            /* 'loop' once */
 711 # endif /* HAVE_WORKING_FORK */
 712
 713         init_lib();
 714 # ifdef SYS_WINNT
 715         /*
 716          * Start interpolation thread, must occur before first
 717          * get_systime()
 718          */
 719         init_winnt_time();
 720 # endif
 721         /*
 722          * Initialize random generator and public key pair
 723          */
 724         get_systime(&now);
 725
 726         ntp_srandom((int)(now.l_i * now.l_uf));
 727
 728         /*
 729          * Detach us from the terminal.  May need an #ifndef GIZMO.
 730          */
 731         if (!nofork) {
 732
 733 # ifdef HAVE_WORKING_FORK
 734                 rc = fork();
 735                 if (-1 == rc) {
 736                         exit_code = (errno) ? errno : -1;
 737                         msyslog(LOG_ERR, "fork: %m");
 738                         exit(exit_code);
 739                 }
 740                 if (rc > 0) {
 741                         /* parent */
 742                         exit_code = wait_child_sync_if(pipe_fds[0],
 743                                                        wait_sync);
 744                         exit(exit_code);
 745                 }
 746
 747                 /*
 748                  * child/daemon
 749                  * close all open files excepting waitsync_fd_to_close.
 750                  * msyslog() unreliable until after init_logging().
 751                  */
 752                 closelog();
 753                 if (syslog_file != NULL) {
 754                         fclose(syslog_file);
 755                         syslog_file = NULL;
 756                         syslogit = TRUE;
 757                 }
 758                 close_all_except(waitsync_fd_to_close);
 759                 INSIST(0 == open("/dev/null", 0) && 1 == dup2(0, 1) \
 760                         && 2 == dup2(0, 2));
 761
 762                 init_logging(progname, 0, TRUE);
 763                 /* we lost our logfile (if any) daemonizing */
 764                 setup_logfile(logfilename);
 765
 766 #  ifdef SYS_DOMAINOS
 767                 {
 768                         uid_$t puid;
 769                         status_$t st;
 770
 771                         proc2_$who_am_i(&puid);
 772                         proc2_$make_server(&puid, &st);
 773                 }
 774 #  endif        /* SYS_DOMAINOS */
 775 #  ifdef HAVE_SETSID
 776                 if (setsid() == (pid_t)-1)
 777                         msyslog(LOG_ERR, "setsid(): %m");
 778 #  elif defined(HAVE_SETPGID)
 779                 if (setpgid(0, 0) == -1)
 780                         msyslog(LOG_ERR, "setpgid(): %m");
 781 #  else         /* !HAVE_SETSID && !HAVE_SETPGID follows */
 782 #   ifdef TIOCNOTTY
 783                 fid = open("/dev/tty", 2);
 784                 if (fid >= 0) {
 785                         ioctl(fid, (u_long)TIOCNOTTY, NULL);
 786                         close(fid);
 787                 }
 788 #   endif       /* TIOCNOTTY */
 789                 ntp_setpgrp(0, getpid());
 790 #  endif        /* !HAVE_SETSID && !HAVE_SETPGID */
 791 #  ifdef _AIX
 792                 /* Don't get killed by low-on-memory signal. */
 793                 sa.sa_handler = catch_danger;
 794                 sigemptyset(&sa.sa_mask);
 795                 sa.sa_flags = SA_RESTART;
 796                 sigaction(SIGDANGER, &sa, NULL);
 797 #  endif        /* _AIX */
 798 # endif         /* HAVE_WORKING_FORK */
 799         }
 800
 801 # ifdef SCO5_CLOCK
 802         /*
 803          * SCO OpenServer's system clock offers much more precise timekeeping
 804          * on the base CPU than the other CPUs (for multiprocessor systems),
 805          * so we must lock to the base CPU.
 806          */
 807         fd = open("/dev/at1", O_RDONLY);
 808         if (fd >= 0) {
 809                 zero = 0;
 810                 if (ioctl(fd, ACPU_LOCK, &zero) < 0)
 811                         msyslog(LOG_ERR, "cannot lock to base CPU: %m");
 812                 close(fd);
 813         }
 814 # endif
 815
 816         /* Setup stack size in preparation for locking pages in memory. */
 817 # if defined(HAVE_MLOCKALL)
 818 #  ifdef HAVE_SETRLIMIT
 819         ntp_rlimit(RLIMIT_STACK, DFLT_RLIMIT_STACK * 4096, 4096, "4k");
 820 #   ifdef RLIMIT_MEMLOCK
 821         /*
 822          * The default RLIMIT_MEMLOCK is very low on Linux systems.
 823          * Unless we increase this limit malloc calls are likely to
 824          * fail if we drop root privilege.  To be useful the value
 825          * has to be larger than the largest ntpd resident set size.
 826          */
 827         ntp_rlimit(RLIMIT_MEMLOCK, DFLT_RLIMIT_MEMLOCK * 1024 * 1024, 1024 * 1024, "MB");
 828 #   endif       /* RLIMIT_MEMLOCK */
 829 #  endif        /* HAVE_SETRLIMIT */
 830 # else  /* !HAVE_MLOCKALL follows */
 831 #  ifdef HAVE_PLOCK
 832 #   ifdef PROCLOCK
 833 #    ifdef _AIX
 834         /*
 835          * set the stack limit for AIX for plock().
 836          * see get_aix_stack() for more info.
 837          */
 838         if (ulimit(SET_STACKLIM, (get_aix_stack() - 8 * 4096)) < 0)
 839                 msyslog(LOG_ERR,
 840                         "Cannot adjust stack limit for plock: %m");
 841 #    endif      /* _AIX */
 842 #   endif       /* PROCLOCK */
 843 #  endif        /* HAVE_PLOCK */
 844 # endif /* !HAVE_MLOCKALL */
 845
 846         /*
 847          * Set up signals we pay attention to locally.
 848          */
 849 # ifdef SIGDIE1
 850         signal_no_reset(SIGDIE1, finish);
 851         signal_no_reset(SIGDIE2, finish);
 852         signal_no_reset(SIGDIE3, finish);
 853         signal_no_reset(SIGDIE4, finish);
 854 # endif
 855 # ifdef SIGBUS
 856         signal_no_reset(SIGBUS, finish);
 857 # endif
 858
 859 # if !defined(SYS_WINNT) && !defined(VMS)
 860 #  ifdef DEBUG
 861         (void) signal_no_reset(MOREDEBUGSIG, moredebug);
 862         (void) signal_no_reset(LESSDEBUGSIG, lessdebug);
 863 #  else
 864         (void) signal_no_reset(MOREDEBUGSIG, no_debug);
 865         (void) signal_no_reset(LESSDEBUGSIG, no_debug);
 866 #  endif        /* DEBUG */
 867 # endif /* !SYS_WINNT && !VMS */
 868
 869         /*
 870          * Set up signals we should never pay attention to.
 871          */
 872 # ifdef SIGPIPE
 873         signal_no_reset(SIGPIPE, SIG_IGN);
 874 # endif
 875
 876         /*
 877          * Call the init_ routines to initialize the data structures.
 878          *
 879          * Exactly what command-line options are we expecting here?
 880          */
 881         INIT_SSL();
 882         init_auth();
 883         init_util();
 884         init_restrict();
 885         init_mon();
 886         init_timer();
 887         init_request();
 888         init_control();
 889         init_peer();
 890 # ifdef REFCLOCK
 891         init_refclock();
 892 # endif
 893         set_process_priority();
 894         init_proto();           /* Call at high priority */
 895         init_io();
 896         init_loopfilter();
 897         mon_start(MON_ON);      /* monitor on by default now      */
 898                                 /* turn off in config if unwanted */
 899
 900         /*
 901          * Get the configuration.  This is done in a separate module
 902          * since this will definitely be different for the gizmo board.
 903          */
 904         getconfig(argc, argv);
 905
 906         if (-1 == cur_memlock) {
 907 # if defined(HAVE_MLOCKALL)
 908                 /*
 909                  * lock the process into memory
 910                  */
 911                 if (   !HAVE_OPT(SAVECONFIGQUIT)
 912 #  ifdef RLIMIT_MEMLOCK
 913                     && -1 != DFLT_RLIMIT_MEMLOCK
 914 #  endif
 915                     && 0 != mlockall(MCL_CURRENT|MCL_FUTURE))
 916                         msyslog(LOG_ERR, "mlockall(): %m");
 917 # else  /* !HAVE_MLOCKALL follows */
 918 #  ifdef HAVE_PLOCK
 919 #   ifdef PROCLOCK
 920                 /*
 921                  * lock the process into memory
 922                  */
 923                 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(PROCLOCK))
 924                         msyslog(LOG_ERR, "plock(PROCLOCK): %m");
 925 #   else        /* !PROCLOCK follows  */
 926 #    ifdef TXTLOCK
 927                 /*
 928                  * Lock text into ram
 929                  */
 930                 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(TXTLOCK))
 931                         msyslog(LOG_ERR, "plock(TXTLOCK) error: %m");
 932 #    else       /* !TXTLOCK follows */
 933                 msyslog(LOG_ERR, "plock() - don't know what to lock!");
 934 #    endif      /* !TXTLOCK */
 935 #   endif       /* !PROCLOCK */
 936 #  endif        /* HAVE_PLOCK */
 937 # endif /* !HAVE_MLOCKALL */
 938         }
 939
 940         loop_config(LOOP_DRIFTINIT, 0);
 941         report_event(EVNT_SYSRESTART, NULL, NULL);
 942         initializing = FALSE;
 943
 944 # ifdef HAVE_DROPROOT
 945         if (droproot) {
 946
 947 #ifdef NEED_EARLY_FORK
 948                 fork_nonchroot_worker();
 949 #endif
 950
 951                 /* Drop super-user privileges and chroot now if the OS supports this */
 952
 953 #  ifdef HAVE_LINUX_CAPABILITIES
 954                 /* set flag: keep privileges accross setuid() call (we only really need cap_sys_time): */
 955                 if (prctl( PR_SET_KEEPCAPS, 1L, 0L, 0L, 0L ) == -1) {
 956                         msyslog( LOG_ERR, "prctl( PR_SET_KEEPCAPS, 1L ) failed: %m" );
 957                         exit(-1);
 958                 }
 959 #  elif HAVE_SOLARIS_PRIVS
 960                 /* Nothing to do here */
 961 #  else
 962                 /* we need a user to switch to */
 963                 if (user == NULL) {
 964                         msyslog(LOG_ERR, "Need user name to drop root privileges (see -u flag!)" );
 965                         exit(-1);
 966                 }
 967 #  endif        /* HAVE_LINUX_CAPABILITIES || HAVE_SOLARIS_PRIVS */
 968
 969                 if (user != NULL) {
 970                         if (isdigit((unsigned char)*user)) {
 971                                 sw_uid = (uid_t)strtoul(user, &endp, 0);
 972                                 if (*endp != '\0')
 973                                         goto getuser;
 974
 975                                 if ((pw = getpwuid(sw_uid)) != NULL) {
 976                                         free(user);
 977                                         user = estrdup(pw->pw_name);
 978                                         sw_gid = pw->pw_gid;
 979                                 } else {
 980                                         errno = 0;
 981                                         msyslog(LOG_ERR, "Cannot find user ID %s", user);
 982                                         exit (-1);
 983                                 }
 984
 985                         } else {
 986 getuser:
 987                                 errno = 0;
 988                                 if ((pw = getpwnam(user)) != NULL) {
 989                                         sw_uid = pw->pw_uid;
 990                                         sw_gid = pw->pw_gid;
 991                                 } else {
 992                                         if (errno)
 993                                                 msyslog(LOG_ERR, "getpwnam(%s) failed: %m", user);
 994                                         else
 995                                                 msyslog(LOG_ERR, "Cannot find user `%s'", user);
 996                                         exit (-1);
 997                                 }
 998                         }
 999                 }
1000                 if (group != NULL) {
1001                         if (isdigit((unsigned char)*group)) {
1002                                 sw_gid = (gid_t)strtoul(group, &endp, 0);
1003                                 if (*endp != '\0')
1004                                         goto getgroup;
1005                         } else {
1006 getgroup:
1007                                 if ((gr = getgrnam(group)) != NULL) {
1008                                         sw_gid = gr->gr_gid;
1009                                 } else {
1010                                         errno = 0;
1011                                         msyslog(LOG_ERR, "Cannot find group `%s'", group);
1012                                         exit (-1);
1013                                 }
1014                         }
1015                 }
1016
1017                 if (chrootdir ) {
1018                         /* make sure cwd is inside the jail: */
1019                         if (chdir(chrootdir)) {
1020                                 msyslog(LOG_ERR, "Cannot chdir() to `%s': %m", chrootdir);
1021                                 exit (-1);
1022                         }
1023                         if (chroot(chrootdir)) {
1024                                 msyslog(LOG_ERR, "Cannot chroot() to `%s': %m", chrootdir);
1025                                 exit (-1);
1026                         }
1027                         if (chdir("/")) {
1028                                 msyslog(LOG_ERR, "Cannot chdir() to`root after chroot(): %m");
1029                                 exit (-1);
1030                         }
1031                 }
1032 #  ifdef HAVE_SOLARIS_PRIVS
1033                 if ((lowprivs = priv_str_to_set(LOWPRIVS, ",", NULL)) == NULL) {
1034                         msyslog(LOG_ERR, "priv_str_to_set() failed:%m");
1035                         exit(-1);
1036                 }
1037                 if ((highprivs = priv_allocset()) == NULL) {
1038                         msyslog(LOG_ERR, "priv_allocset() failed:%m");
1039                         exit(-1);
1040                 }
1041                 (void) getppriv(PRIV_PERMITTED, highprivs);
1042                 (void) priv_intersect(highprivs, lowprivs);
1043                 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) {
1044                         msyslog(LOG_ERR, "setppriv() failed:%m");
1045                         exit(-1);
1046                 }
1047 #  endif /* HAVE_SOLARIS_PRIVS */
1048                 if (user && initgroups(user, sw_gid)) {
1049                         msyslog(LOG_ERR, "Cannot initgroups() to user `%s': %m", user);
1050                         exit (-1);
1051                 }
1052                 if (group && setgid(sw_gid)) {
1053                         msyslog(LOG_ERR, "Cannot setgid() to group `%s': %m", group);
1054                         exit (-1);
1055                 }
1056                 if (group && setegid(sw_gid)) {
1057                         msyslog(LOG_ERR, "Cannot setegid() to group `%s': %m", group);
1058                         exit (-1);
1059                 }
1060                 if (group) {
1061                         if (0 != setgroups(1, &sw_gid)) {
1062                                 msyslog(LOG_ERR, "setgroups(1, %d) failed: %m", sw_gid);
1063                                 exit (-1);
1064                         }
1065                 }
1066                 else if (pw)
1067                         if (0 != initgroups(pw->pw_name, pw->pw_gid)) {
1068                                 msyslog(LOG_ERR, "initgroups(<%s>, %d) filed: %m", pw->pw_name, pw->pw_gid);
1069                                 exit (-1);
1070                         }
1071                 if (user && setuid(sw_uid)) {
1072                         msyslog(LOG_ERR, "Cannot setuid() to user `%s': %m", user);
1073                         exit (-1);
1074                 }
1075                 if (user && seteuid(sw_uid)) {
1076                         msyslog(LOG_ERR, "Cannot seteuid() to user `%s': %m", user);
1077                         exit (-1);
1078                 }
1079
1080 #  if !defined(HAVE_LINUX_CAPABILITIES) && !defined(HAVE_SOLARIS_PRIVS)
1081                 /*
1082                  * for now assume that the privilege to bind to privileged ports
1083                  * is associated with running with uid 0 - should be refined on
1084                  * ports that allow binding to NTP_PORT with uid != 0
1085                  */
1086                 disable_dynamic_updates |= (sw_uid != 0);  /* also notifies routing message listener */
1087 #  endif /* !HAVE_LINUX_CAPABILITIES && !HAVE_SOLARIS_PRIVS */
1088
1089                 if (disable_dynamic_updates && interface_interval) {
1090                         interface_interval = 0;
1091                         msyslog(LOG_INFO, "running as non-root disables dynamic interface tracking");
1092                 }
1093
1094 #  ifdef HAVE_LINUX_CAPABILITIES
1095                 {
1096                         /*
1097                          *  We may be running under non-root uid now, but we still hold full root privileges!
1098                          *  We drop all of them, except for the crucial one or two: cap_sys_time and
1099                          *  cap_net_bind_service if doing dynamic interface tracking.
1100                          */
1101                         cap_t caps;
1102                         char *captext;
1103
1104                         captext = (0 != interface_interval)
1105                                       ? "cap_sys_time,cap_net_bind_service=pe"
1106                                       : "cap_sys_time=pe";
1107                         caps = cap_from_text(captext);
1108                         if (!caps) {
1109                                 msyslog(LOG_ERR,
1110                                         "cap_from_text(%s) failed: %m",
1111                                         captext);
1112                                 exit(-1);
1113                         }
1114                         if (-1 == cap_set_proc(caps)) {
1115                                 msyslog(LOG_ERR,
1116                                         "cap_set_proc() failed to drop root privs: %m");
1117                                 exit(-1);
1118                         }
1119                         cap_free(caps);
1120                 }
1121 #  endif        /* HAVE_LINUX_CAPABILITIES */
1122 #  ifdef HAVE_SOLARIS_PRIVS
1123                 if (priv_delset(lowprivs, "proc_setid") == -1) {
1124                         msyslog(LOG_ERR, "priv_delset() failed:%m");
1125                         exit(-1);
1126                 }
1127                 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) {
1128                         msyslog(LOG_ERR, "setppriv() failed:%m");
1129                         exit(-1);
1130                 }
1131                 priv_freeset(lowprivs);
1132                 priv_freeset(highprivs);
1133 #  endif /* HAVE_SOLARIS_PRIVS */
1134                 root_dropped = TRUE;
1135                 fork_deferred_worker();
1136         }       /* if (droproot) */
1137 # endif /* HAVE_DROPROOT */
1138
1139 /* libssecomp sandboxing */
1140 #if defined (LIBSECCOMP) && (KERN_SECCOMP)
1141         scmp_filter_ctx ctx;
1142
1143         if ((ctx = seccomp_init(SCMP_ACT_KILL)) < 0)
1144                 msyslog(LOG_ERR, "%s: seccomp_init(SCMP_ACT_KILL) failed: %m", __func__);
1145         else {
1146                 msyslog(LOG_DEBUG, "%s: seccomp_init(SCMP_ACT_KILL) succeeded", __func__);
1147         }
1148
1149 #ifdef __x86_64__
1150 int scmp_sc[] = {
1151         SCMP_SYS(adjtimex),
1152         SCMP_SYS(bind),
1153         SCMP_SYS(brk),
1154         SCMP_SYS(chdir),
1155         SCMP_SYS(clock_gettime),
1156         SCMP_SYS(clock_settime),
1157         SCMP_SYS(close),
1158         SCMP_SYS(connect),
1159         SCMP_SYS(exit_group),
1160         SCMP_SYS(fstat),
1161         SCMP_SYS(fsync),
1162         SCMP_SYS(futex),
1163         SCMP_SYS(getitimer),
1164         SCMP_SYS(getsockname),
1165         SCMP_SYS(ioctl),
1166         SCMP_SYS(lseek),
1167         SCMP_SYS(madvise),
1168         SCMP_SYS(mmap),
1169         SCMP_SYS(munmap),
1170         SCMP_SYS(open),
1171         SCMP_SYS(poll),
1172         SCMP_SYS(read),
1173         SCMP_SYS(recvmsg),
1174         SCMP_SYS(rename),
1175         SCMP_SYS(rt_sigaction),
1176         SCMP_SYS(rt_sigprocmask),
1177         SCMP_SYS(rt_sigreturn),
1178         SCMP_SYS(select),
1179         SCMP_SYS(sendto),
1180         SCMP_SYS(setitimer),
1181         SCMP_SYS(setsid),
1182         SCMP_SYS(socket),
1183         SCMP_SYS(stat),
1184         SCMP_SYS(time),
1185         SCMP_SYS(write),
1186 };
1187 #endif
1188 #ifdef __i386__
1189 int scmp_sc[] = {
1190         SCMP_SYS(_newselect),
1191         SCMP_SYS(adjtimex),
1192         SCMP_SYS(brk),
1193         SCMP_SYS(chdir),
1194         SCMP_SYS(clock_gettime),
1195         SCMP_SYS(clock_settime),
1196         SCMP_SYS(close),
1197         SCMP_SYS(exit_group),
1198         SCMP_SYS(fsync),
1199         SCMP_SYS(futex),
1200         SCMP_SYS(getitimer),
1201         SCMP_SYS(madvise),
1202         SCMP_SYS(mmap),
1203         SCMP_SYS(mmap2),
1204         SCMP_SYS(munmap),
1205         SCMP_SYS(open),
1206         SCMP_SYS(poll),
1207         SCMP_SYS(read),
1208         SCMP_SYS(rename),
1209         SCMP_SYS(rt_sigaction),
1210         SCMP_SYS(rt_sigprocmask),
1211         SCMP_SYS(select),
1212         SCMP_SYS(setitimer),
1213         SCMP_SYS(setsid),
1214         SCMP_SYS(sigprocmask),
1215         SCMP_SYS(sigreturn),
1216         SCMP_SYS(socketcall),
1217         SCMP_SYS(stat64),
1218         SCMP_SYS(time),
1219         SCMP_SYS(write),
1220 };
1221 #endif
1222         {
1223                 int i;
1224
1225                 for (i = 0; i < COUNTOF(scmp_sc); i++) {
1226                         if (seccomp_rule_add(ctx,
1227                             SCMP_ACT_ALLOW, scmp_sc[i], 0) < 0) {
1228                                 msyslog(LOG_ERR,
1229                                     "%s: seccomp_rule_add() failed: %m",
1230                                     __func__);
1231                         }
1232                 }
1233         }
1234
1235         if (seccomp_load(ctx) < 0)
1236                 msyslog(LOG_ERR, "%s: seccomp_load() failed: %m",
1237                     __func__);
1238         else {
1239                 msyslog(LOG_DEBUG, "%s: seccomp_load() succeeded", __func__);
1240         }
1241 #endif /* LIBSECCOMP and KERN_SECCOMP */
1242
1243 # ifdef HAVE_IO_COMPLETION_PORT
1244
1245         for (;;) {
1246 #if !defined(SIM) && defined(SIGDIE1)
1247                 if (signalled)
1248                         finish_safe(signo);
1249 #endif
1250                 GetReceivedBuffers();
1251 # else /* normal I/O */
1252
1253         BLOCK_IO_AND_ALARM();
1254         was_alarmed = FALSE;
1255
1256         for (;;) {
1257 #if !defined(SIM) && defined(SIGDIE1)
1258                 if (signalled)
1259                         finish_safe(signo);
1260 #endif
1261                 if (alarm_flag) {       /* alarmed? */
1262                         was_alarmed = TRUE;
1263                         alarm_flag = FALSE;
1264                 }
1265
1266                 /* collect async name/addr results */
1267                 if (!was_alarmed)
1268                     harvest_blocking_responses();
1269
1270                 if (!was_alarmed && !has_full_recv_buffer()) {
1271                         /*
1272                          * Nothing to do.  Wait for something.
1273                          */
1274                         io_handler();
1275                 }
1276
1277                 if (alarm_flag) {       /* alarmed? */
1278                         was_alarmed = TRUE;
1279                         alarm_flag = FALSE;
1280                 }
1281
1282                 if (was_alarmed) {
1283                         UNBLOCK_IO_AND_ALARM();
1284                         /*
1285                          * Out here, signals are unblocked.  Call timer routine
1286                          * to process expiry.
1287                          */
1288                         timer();
1289                         was_alarmed = FALSE;
1290                         BLOCK_IO_AND_ALARM();
1291                 }
1292
1293 # endif         /* !HAVE_IO_COMPLETION_PORT */
1294
1295 # ifdef DEBUG_TIMING
1296                 {
1297                         l_fp pts;
1298                         l_fp tsa, tsb;
1299                         int bufcount = 0;
1300
1301                         get_systime(&pts);
1302                         tsa = pts;
1303 # endif
1304                         rbuf = get_full_recv_buffer();
1305                         while (rbuf != NULL) {
1306                                 if (alarm_flag) {
1307                                         was_alarmed = TRUE;
1308                                         alarm_flag = FALSE;
1309                                 }
1310                                 UNBLOCK_IO_AND_ALARM();
1311
1312                                 if (was_alarmed) {
1313                                         /* avoid timer starvation during lengthy I/O handling */
1314                                         timer();
1315                                         was_alarmed = FALSE;
1316                                 }
1317
1318                                 /*
1319                                  * Call the data procedure to handle each received
1320                                  * packet.
1321                                  */
1322                                 if (rbuf->receiver != NULL) {
1323 # ifdef DEBUG_TIMING
1324                                         l_fp dts = pts;
1325
1326                                         L_SUB(&dts, &rbuf->recv_time);
1327                                         DPRINTF(2, ("processing timestamp delta %s (with prec. fuzz)\n", lfptoa(&dts, 9)));
1328                                         collect_timing(rbuf, "buffer processing delay", 1, &dts);
1329                                         bufcount++;
1330 # endif
1331                                         (*rbuf->receiver)(rbuf);
1332                                 } else {
1333                                         msyslog(LOG_ERR, "fatal: receive buffer callback NULL");
1334                                         abort();
1335                                 }
1336
1337                                 BLOCK_IO_AND_ALARM();
1338                                 freerecvbuf(rbuf);
1339                                 rbuf = get_full_recv_buffer();
1340                         }
1341 # ifdef DEBUG_TIMING
1342                         get_systime(&tsb);
1343                         L_SUB(&tsb, &tsa);
1344                         if (bufcount) {
1345                                 collect_timing(NULL, "processing", bufcount, &tsb);
1346                                 DPRINTF(2, ("processing time for %d buffers %s\n", bufcount, lfptoa(&tsb, 9)));
1347                         }
1348                 }
1349 # endif
1350
1351                 /*
1352                  * Go around again
1353                  */
1354
1355 # ifdef HAVE_DNSREGISTRATION
1356                 if (mdnsreg && (current_time - mdnsreg ) > 60 && mdnstries && sys_leap != LEAP_NOTINSYNC) {
1357                         mdnsreg = current_time;
1358                         msyslog(LOG_INFO, "Attempting to register mDNS");
1359                         if ( DNSServiceRegister (&mdns, 0, 0, NULL, "_ntp._udp", NULL, NULL,
1360                             htons(NTP_PORT), 0, NULL, NULL, NULL) != kDNSServiceErr_NoError ) {
1361                                 if (!--mdnstries) {
1362                                         msyslog(LOG_ERR, "Unable to register mDNS, giving up.");
1363                                 } else {
1364                                         msyslog(LOG_INFO, "Unable to register mDNS, will try later.");
1365                                 }
1366                         } else {
1367                                 msyslog(LOG_INFO, "mDNS service registered.");
1368                                 mdnsreg = FALSE;
1369                         }
1370                 }
1371 # endif /* HAVE_DNSREGISTRATION */
1372
1373         }
1374         UNBLOCK_IO_AND_ALARM();
1375         return 1;
1376 }
1377 #endif  /* !SIM */
1378
1379
1380 #if !defined(SIM) && defined(SIGDIE1)
1381 /*
1382  * finish - exit gracefully
1383  */
1384 static void
1385 finish_safe(
1386         int     sig
1387         )
1388 {
1389         const char *sig_desc;
1390
1391         sig_desc = NULL;
1392 #ifdef HAVE_STRSIGNAL
1393         sig_desc = strsignal(sig);
1394 #endif
1395         if (sig_desc == NULL)
1396                 sig_desc = "";
1397         msyslog(LOG_NOTICE, "%s exiting on signal %d (%s)", progname,
1398                 sig, sig_desc);
1399         /* See Bug 2513 and Bug 2522 re the unlink of PIDFILE */
1400 # ifdef HAVE_DNSREGISTRATION
1401         if (mdns != NULL)
1402                 DNSServiceRefDeallocate(mdns);
1403 # endif
1404         peer_cleanup();
1405         exit(0);
1406 }
1407
1408 static RETSIGTYPE
1409 finish(
1410         int     sig
1411         )
1412 {
1413         signalled = 1;
1414         signo = sig;
1415 }
1416
1417 #endif  /* !SIM && SIGDIE1 */
1418
1419
1420 #ifndef SIM
1421 /*
1422  * wait_child_sync_if - implements parent side of -w/--wait-sync
1423  */
1424 # ifdef HAVE_WORKING_FORK
1425 static int
1426 wait_child_sync_if(
1427         int     pipe_read_fd,
1428         long    wait_sync
1429         )
1430 {
1431         int     rc;
1432         int     exit_code;
1433         time_t  wait_end_time;
1434         time_t  cur_time;
1435         time_t  wait_rem;
1436         fd_set  readset;
1437         struct timeval wtimeout;
1438
1439         if (0 == wait_sync)
1440                 return 0;
1441
1442         /* waitsync_fd_to_close used solely by child */
1443         close(waitsync_fd_to_close);
1444         wait_end_time = time(NULL) + wait_sync;
1445         do {
1446                 cur_time = time(NULL);
1447                 wait_rem = (wait_end_time > cur_time)
1448                                 ? (wait_end_time - cur_time)
1449                                 : 0;
1450                 wtimeout.tv_sec = wait_rem;
1451                 wtimeout.tv_usec = 0;
1452                 FD_ZERO(&readset);
1453                 FD_SET(pipe_read_fd, &readset);
1454                 rc = select(pipe_read_fd + 1, &readset, NULL, NULL,
1455                             &wtimeout);
1456                 if (-1 == rc) {
1457                         if (EINTR == errno)
1458                                 continue;
1459                         exit_code = (errno) ? errno : -1;
1460                         msyslog(LOG_ERR,
1461                                 "--wait-sync select failed: %m");
1462                         return exit_code;
1463                 }
1464                 if (0 == rc) {
1465                         /*
1466                          * select() indicated a timeout, but in case
1467                          * its timeouts are affected by a step of the
1468                          * system clock, select() again with a zero
1469                          * timeout to confirm.
1470                          */
1471                         FD_ZERO(&readset);
1472                         FD_SET(pipe_read_fd, &readset);
1473                         wtimeout.tv_sec = 0;
1474                         wtimeout.tv_usec = 0;
1475                         rc = select(pipe_read_fd + 1, &readset, NULL,
1476                                     NULL, &wtimeout);
1477                         if (0 == rc)    /* select() timeout */
1478                                 break;
1479                         else            /* readable */
1480                                 return 0;
1481                 } else                  /* readable */
1482                         return 0;
1483         } while (wait_rem > 0);
1484
1485         fprintf(stderr, "%s: -w/--wait-sync %ld timed out.\n",
1486                 progname, wait_sync);
1487         return ETIMEDOUT;
1488 }
1489 # endif /* HAVE_WORKING_FORK */
1490
1491
1492 /*
1493  * assertion_failed - Redirect assertion failures to msyslog().
1494  */
1495 static void
1496 assertion_failed(
1497         const char *file,
1498         int line,
1499         isc_assertiontype_t type,
1500         const char *cond
1501         )
1502 {
1503         isc_assertion_setcallback(NULL);    /* Avoid recursion */
1504
1505         msyslog(LOG_ERR, "%s:%d: %s(%s) failed",
1506                 file, line, isc_assertion_typetotext(type), cond);
1507         msyslog(LOG_ERR, "exiting (due to assertion failure)");
1508
1509 #if defined(DEBUG) && defined(SYS_WINNT)
1510         if (debug)
1511                 DebugBreak();
1512 #endif
1513
1514         abort();
1515 }
1516
1517
1518 /*
1519  * library_fatal_error - Handle fatal errors from our libraries.
1520  */
1521 static void
1522 library_fatal_error(
1523         const char *file,
1524         int line,
1525         const char *format,
1526         va_list args
1527         )
1528 {
1529         char errbuf[256];
1530
1531         isc_error_setfatal(NULL);  /* Avoid recursion */
1532
1533         msyslog(LOG_ERR, "%s:%d: fatal error:", file, line);
1534         vsnprintf(errbuf, sizeof(errbuf), format, args);
1535         msyslog(LOG_ERR, "%s", errbuf);
1536         msyslog(LOG_ERR, "exiting (due to fatal error in library)");
1537
1538 #if defined(DEBUG) && defined(SYS_WINNT)
1539         if (debug)
1540                 DebugBreak();
1541 #endif
1542
1543         abort();
1544 }
1545
1546
1547 /*
1548  * library_unexpected_error - Handle non fatal errors from our libraries.
1549  */
1550 # define MAX_UNEXPECTED_ERRORS 100
1551 int unexpected_error_cnt = 0;
1552 static void
1553 library_unexpected_error(
1554         const char *file,
1555         int line,
1556         const char *format,
1557         va_list args
1558         )
1559 {
1560         char errbuf[256];
1561
1562         if (unexpected_error_cnt >= MAX_UNEXPECTED_ERRORS)
1563                 return; /* avoid clutter in log */
1564
1565         msyslog(LOG_ERR, "%s:%d: unexpected error:", file, line);
1566         vsnprintf(errbuf, sizeof(errbuf), format, args);
1567         msyslog(LOG_ERR, "%s", errbuf);
1568
1569         if (++unexpected_error_cnt == MAX_UNEXPECTED_ERRORS)
1570                 msyslog(LOG_ERR, "Too many errors.  Shutting up.");
1571
1572 }
1573 #endif  /* !SIM */
1574
1575 #if !defined(SIM) && !defined(SYS_WINNT)
1576 # ifdef DEBUG
1577
1578 /*
1579  * moredebug - increase debugging verbosity
1580  */
1581 static RETSIGTYPE
1582 moredebug(
1583         int sig
1584         )
1585 {
1586         int saved_errno = errno;
1587
1588         if (debug < 255)
1589         {
1590                 debug++;
1591                 msyslog(LOG_DEBUG, "debug raised to %d", debug);
1592         }
1593         errno = saved_errno;
1594 }
1595
1596
1597 /*
1598  * lessdebug - decrease debugging verbosity
1599  */
1600 static RETSIGTYPE
1601 lessdebug(
1602         int sig
1603         )
1604 {
1605         int saved_errno = errno;
1606
1607         if (debug > 0)
1608         {
1609                 debug--;
1610                 msyslog(LOG_DEBUG, "debug lowered to %d", debug);
1611         }
1612         errno = saved_errno;
1613 }
1614
1615 # else  /* !DEBUG follows */
1616
1617
1618 /*
1619  * no_debug - We don't do the debug here.
1620  */
1621 static RETSIGTYPE
1622 no_debug(
1623         int sig
1624         )
1625 {
1626         int saved_errno = errno;
1627
1628         msyslog(LOG_DEBUG, "ntpd not compiled for debugging (signal %d)", sig);
1629         errno = saved_errno;
1630 }
1631 # endif /* !DEBUG */
1632 #endif  /* !SIM && !SYS_WINNT */