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 SYS_WINNT
 108 # include "ntservice.h"
 109 #endif
 110
 111 #ifdef _AIX
 112 # include <ulimit.h>
 113 #endif /* _AIX */
 114
 115 #ifdef SCO5_CLOCK
 116 # include <sys/ci/ciioctl.h>
 117 #endif
 118
 119 #ifdef HAVE_DROPROOT
 120 # include <ctype.h>
 121 # include <grp.h>
 122 # include <pwd.h>
 123 #ifdef HAVE_LINUX_CAPABILITIES
 124 # include <sys/capability.h>
 125 # include <sys/prctl.h>
 126 #endif /* HAVE_LINUX_CAPABILITIES */
 127 #if defined(HAVE_PRIV_H) && defined(HAVE_SOLARIS_PRIVS)
 128 # include <priv.h>
 129 #endif /* HAVE_PRIV_H */
 130 #if defined(HAVE_TRUSTEDBSD_MAC)
 131 # include <sys/mac.h>
 132 #endif /* HAVE_TRUSTEDBSD_MAC */
 133 #endif /* HAVE_DROPROOT */
 134
 135 #if defined (LIBSECCOMP) && (KERN_SECCOMP)
 136 /* # include <sys/types.h> */
 137 # include <sys/resource.h>
 138 # include <seccomp.h>
 139 #endif /* LIBSECCOMP and KERN_SECCOMP */
 140
 141 #ifdef HAVE_DNSREGISTRATION
 142 # include <dns_sd.h>
 143 DNSServiceRef mdns;
 144 #endif
 145
 146 #ifdef HAVE_SETPGRP_0
 147 # define ntp_setpgrp(x, y)      setpgrp()
 148 #else
 149 # define ntp_setpgrp(x, y)      setpgrp(x, y)
 150 #endif
 151
 152 #ifdef HAVE_SOLARIS_PRIVS
 153 # define LOWPRIVS "basic,sys_time,net_privaddr,proc_setid,!proc_info,!proc_session,!proc_exec"
 154 static priv_set_t *lowprivs = NULL;
 155 static priv_set_t *highprivs = NULL;
 156 #endif /* HAVE_SOLARIS_PRIVS */
 157 /*
 158  * Scheduling priority we run at
 159  */
 160 #define NTPD_PRIO       (-12)
 161
 162 int priority_done = 2;          /* 0 - Set priority */
 163                                 /* 1 - priority is OK where it is */
 164                                 /* 2 - Don't set priority */
 165                                 /* 1 and 2 are pretty much the same */
 166
 167 int listen_to_virtual_ips = TRUE;
 168
 169 /*
 170  * No-fork flag.  If set, we do not become a background daemon.
 171  */
 172 int nofork;                     /* Fork by default */
 173
 174 #ifdef HAVE_DNSREGISTRATION
 175 /*
 176  * mDNS registration flag. If set, we attempt to register with the mDNS system, but only
 177  * after we have synched the first time. If the attempt fails, then try again once per
 178  * minute for up to 5 times. After all, we may be starting before mDNS.
 179  */
 180 int mdnsreg = FALSE;
 181 int mdnstries = 5;
 182 #endif  /* HAVE_DNSREGISTRATION */
 183
 184 #ifdef HAVE_DROPROOT
 185 int droproot;
 186 int root_dropped;
 187 char *user;             /* User to switch to */
 188 char *group;            /* group to switch to */
 189 const char *chrootdir;  /* directory to chroot to */
 190 uid_t sw_uid;
 191 gid_t sw_gid;
 192 struct group *gr;
 193 struct passwd *pw;
 194 #endif /* HAVE_DROPROOT */
 195
 196 #ifdef HAVE_WORKING_FORK
 197 int     waitsync_fd_to_close = -1;      /* -w/--wait-sync */
 198 #endif
 199
 200 /*
 201  * Version declaration
 202  */
 203 extern const char *Version;
 204
 205 char const *progname;
 206
 207 int was_alarmed;
 208
 209 #ifdef DECL_SYSCALL
 210 /*
 211  * We put this here, since the argument profile is syscall-specific
 212  */
 213 extern int syscall      (int, ...);
 214 #endif /* DECL_SYSCALL */
 215
 216
 217 #if !defined(SIM) && defined(SIGDIE1)
 218 static volatile int signalled   = 0;
 219 static volatile int signo       = 0;
 220
 221 /* In an ideal world, 'finish_safe()' would declared as noreturn... */
 222 static  void            finish_safe     (int);
 223 static  RETSIGTYPE      finish          (int);
 224 #endif
 225
 226 #if !defined(SIM) && defined(HAVE_WORKING_FORK)
 227 static int      wait_child_sync_if      (int, long);
 228 #endif
 229
 230 #if !defined(SIM) && !defined(SYS_WINNT)
 231 # ifdef DEBUG
 232 static  RETSIGTYPE      moredebug       (int);
 233 static  RETSIGTYPE      lessdebug       (int);
 234 # else  /* !DEBUG follows */
 235 static  RETSIGTYPE      no_debug        (int);
 236 # endif /* !DEBUG */
 237 #endif  /* !SIM && !SYS_WINNT */
 238
 239 #ifndef WORK_FORK
 240 int     saved_argc;
 241 char ** saved_argv;
 242 #endif
 243
 244 #ifndef SIM
 245 int             ntpdmain                (int, char **);
 246 static void     set_process_priority    (void);
 247 static void     assertion_failed        (const char *, int,
 248                                          isc_assertiontype_t,
 249                                          const char *)
 250                         __attribute__   ((__noreturn__));
 251 static void     library_fatal_error     (const char *, int,
 252                                          const char *, va_list)
 253                                         ISC_FORMAT_PRINTF(3, 0);
 254 static void     library_unexpected_error(const char *, int,
 255                                          const char *, va_list)
 256                                         ISC_FORMAT_PRINTF(3, 0);
 257 #endif  /* !SIM */
 258
 259
 260 /* Bug2332 unearthed a problem in the interaction of reduced user
 261  * privileges, the limits on memory usage and some versions of the
 262  * pthread library on Linux systems. The 'pthread_cancel()' function and
 263  * likely some others need to track the stack of the thread involved,
 264  * and uses a function that comes from GCC (--> libgcc_s.so) to do
 265  * this. Unfortunately the developers of glibc decided to load the
 266  * library on demand, which speeds up program start but can cause
 267  * trouble here: Due to all the things NTPD does to limit its resource
 268  * usage, this deferred load of libgcc_s does not always work once the
 269  * restrictions are in effect.
 270  *
 271  * One way out of this was attempting a forced link against libgcc_s
 272  * when possible because it makes the library available immediately
 273  * without deferred load. (The symbol resolution would still be dynamic
 274  * and on demand, but the code would already be in the process image.)
 275  *
 276  * This is a tricky thing to do, since it's not necessary everywhere,
 277  * not possible everywhere, has shown to break the build of other
 278  * programs in the NTP suite and is now generally frowned upon.
 279  *
 280  * So we take a different approach here: We creat a worker thread that does
 281  * actually nothing except waiting for cancellation and cancel it. If
 282  * this is done before all the limitations are put in place, the
 283  * machinery is pre-heated and all the runtime stuff should be in place
 284  * and useable when needed.
 285  *
 286  * This uses only the standard pthread API and should work with all
 287  * implementations of pthreads. It is not necessary everywhere, but it's
 288  * cheap enough to go on nearly unnoticed.
 289  *
 290  * Addendum: Bug 2954 showed that the assumption that this should work
 291  * with all OS is wrong -- at least FreeBSD bombs heavily.
 292  */
 293 #ifdef NEED_PTHREAD_WARMUP
 294
 295 /* simple thread function: sleep until cancelled, just to exercise
 296  * thread cancellation.
 297  */
 298 static void*
 299 my_pthread_warmup_worker(
 300         void *thread_args)
 301 {
 302         (void)thread_args;
 303         for (;;)
 304                 sleep(10);
 305         return NULL;
 306 }
 307
 308 /* pre-heat threading: create a thread and cancel it, just to exercise
 309  * thread cancellation.
 310  */
 311 static void
 312 my_pthread_warmup(void)
 313 {
 314         pthread_t       thread;
 315         pthread_attr_t  thr_attr;
 316         int             rc;
 317
 318         pthread_attr_init(&thr_attr);
 319 #if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \
 320     defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && \
 321     defined(PTHREAD_STACK_MIN)
 322         {
 323                 size_t ssmin = 32*1024; /* 32kB should be minimum */
 324                 if (ssmin < PTHREAD_STACK_MIN)
 325                         ssmin = PTHREAD_STACK_MIN;
 326                 rc = pthread_attr_setstacksize(&thr_attr, ssmin);
 327                 if (0 != rc)
 328                         msyslog(LOG_ERR,
 329                                 "my_pthread_warmup: pthread_attr_setstacksize() -> %s",
 330                                 strerror(rc));
 331         }
 332 #endif
 333         rc = pthread_create(
 334                 &thread, &thr_attr, my_pthread_warmup_worker, NULL);
 335         pthread_attr_destroy(&thr_attr);
 336         if (0 != rc) {
 337                 msyslog(LOG_ERR,
 338                         "my_pthread_warmup: pthread_create() -> %s",
 339                         strerror(rc));
 340         } else {
 341                 pthread_cancel(thread);
 342                 pthread_join(thread, NULL);
 343         }
 344 }
 345
 346 #endif /*defined(NEED_PTHREAD_WARMUP)*/
 347
 348 #ifdef NEED_EARLY_FORK
 349 static void
 350 dummy_callback(void) { return; }
 351
 352 static void
 353 fork_nonchroot_worker(void) {
 354         getaddrinfo_sometime("localhost", "ntp", NULL, INITIAL_DNS_RETRY,
 355                              (gai_sometime_callback)&dummy_callback, NULL);
 356 }
 357 #endif /* NEED_EARLY_FORK */
 358
 359 void
 360 parse_cmdline_opts(
 361         int *   pargc,
 362         char ***pargv
 363         )
 364 {
 365         static int      parsed;
 366         static int      optct;
 367
 368         if (!parsed)
 369                 optct = ntpOptionProcess(&ntpdOptions, *pargc, *pargv);
 370
 371         parsed = 1;
 372
 373         *pargc -= optct;
 374         *pargv += optct;
 375 }
 376
 377
 378 #ifdef SIM
 379 int
 380 main(
 381         int argc,
 382         char *argv[]
 383         )
 384 {
 385         progname = argv[0];
 386         parse_cmdline_opts(&argc, &argv);
 387 #ifdef DEBUG
 388         debug = OPT_VALUE_SET_DEBUG_LEVEL;
 389         DPRINTF(1, ("%s\n", Version));
 390 #endif
 391
 392         return ntpsim(argc, argv);
 393 }
 394 #else   /* !SIM follows */
 395 #ifdef NO_MAIN_ALLOWED
 396 CALL(ntpd,"ntpd",ntpdmain);
 397 #else   /* !NO_MAIN_ALLOWED follows */
 398 #ifndef SYS_WINNT
 399 int
 400 main(
 401         int argc,
 402         char *argv[]
 403         )
 404 {
 405         return ntpdmain(argc, argv);
 406 }
 407 #endif /* !SYS_WINNT */
 408 #endif /* !NO_MAIN_ALLOWED */
 409 #endif /* !SIM */
 410
 411 #ifdef _AIX
 412 /*
 413  * OK. AIX is different than solaris in how it implements plock().
 414  * If you do NOT adjust the stack limit, you will get the MAXIMUM
 415  * stack size allocated and PINNED with you program. To check the
 416  * value, use ulimit -a.
 417  *
 418  * To fix this, we create an automatic variable and set our stack limit
 419  * to that PLUS 32KB of extra space (we need some headroom).
 420  *
 421  * This subroutine gets the stack address.
 422  *
 423  * Grover Davidson and Matt Ladendorf
 424  *
 425  */
 426 static char *
 427 get_aix_stack(void)
 428 {
 429         char ch;
 430         return (&ch);
 431 }
 432
 433 /*
 434  * Signal handler for SIGDANGER.
 435  */
 436 static void
 437 catch_danger(int signo)
 438 {
 439         msyslog(LOG_INFO, "ntpd: setpgid(): %m");
 440         /* Make the system believe we'll free something, but don't do it! */
 441         return;
 442 }
 443 #endif /* _AIX */
 444
 445 /*
 446  * Set the process priority
 447  */
 448 #ifndef SIM
 449 static void
 450 set_process_priority(void)
 451 {
 452
 453 # ifdef DEBUG
 454         if (debug > 1)
 455                 msyslog(LOG_DEBUG, "set_process_priority: %s: priority_done is <%d>",
 456                         ((priority_done)
 457                          ? "Leave priority alone"
 458                          : "Attempt to set priority"
 459                                 ),
 460                         priority_done);
 461 # endif /* DEBUG */
 462
 463 # if defined(HAVE_SCHED_SETSCHEDULER)
 464         if (!priority_done) {
 465                 extern int config_priority_override, config_priority;
 466                 int pmax, pmin;
 467                 struct sched_param sched;
 468
 469                 pmax = sched_get_priority_max(SCHED_FIFO);
 470                 sched.sched_priority = pmax;
 471                 if ( config_priority_override ) {
 472                         pmin = sched_get_priority_min(SCHED_FIFO);
 473                         if ( config_priority > pmax )
 474                                 sched.sched_priority = pmax;
 475                         else if ( config_priority < pmin )
 476                                 sched.sched_priority = pmin;
 477                         else
 478                                 sched.sched_priority = config_priority;
 479                 }
 480                 if ( sched_setscheduler(0, SCHED_FIFO, &sched) == -1 )
 481                         msyslog(LOG_ERR, "sched_setscheduler(): %m");
 482                 else
 483                         ++priority_done;
 484         }
 485 # endif /* HAVE_SCHED_SETSCHEDULER */
 486 # ifdef HAVE_RTPRIO
 487 #  ifdef RTP_SET
 488         if (!priority_done) {
 489                 struct rtprio srtp;
 490
 491                 srtp.type = RTP_PRIO_REALTIME;  /* was: RTP_PRIO_NORMAL */
 492                 srtp.prio = 0;          /* 0 (hi) -> RTP_PRIO_MAX (31,lo) */
 493
 494                 if (rtprio(RTP_SET, getpid(), &srtp) < 0)
 495                         msyslog(LOG_ERR, "rtprio() error: %m");
 496                 else
 497                         ++priority_done;
 498         }
 499 #  else /* !RTP_SET follows */
 500         if (!priority_done) {
 501                 if (rtprio(0, 120) < 0)
 502                         msyslog(LOG_ERR, "rtprio() error: %m");
 503                 else
 504                         ++priority_done;
 505         }
 506 #  endif        /* !RTP_SET */
 507 # endif /* HAVE_RTPRIO */
 508 # if defined(NTPD_PRIO) && NTPD_PRIO != 0
 509 #  ifdef HAVE_ATT_NICE
 510         if (!priority_done) {
 511                 errno = 0;
 512                 if (-1 == nice (NTPD_PRIO) && errno != 0)
 513                         msyslog(LOG_ERR, "nice() error: %m");
 514                 else
 515                         ++priority_done;
 516         }
 517 #  endif        /* HAVE_ATT_NICE */
 518 #  ifdef HAVE_BSD_NICE
 519         if (!priority_done) {
 520                 if (-1 == setpriority(PRIO_PROCESS, 0, NTPD_PRIO))
 521                         msyslog(LOG_ERR, "setpriority() error: %m");
 522                 else
 523                         ++priority_done;
 524         }
 525 #  endif        /* HAVE_BSD_NICE */
 526 # endif /* NTPD_PRIO && NTPD_PRIO != 0 */
 527         if (!priority_done)
 528                 msyslog(LOG_ERR, "set_process_priority: No way found to improve our priority");
 529 }
 530 #endif  /* !SIM */
 531
 532 #if !defined(SIM) && !defined(SYS_WINNT)
 533 /*
 534  * Detach from terminal (much like daemon())
 535  * Nothe that this function calls exit()
 536  */
 537 static void
 538 detach_from_terminal(
 539         int pipe_fds[2],
 540         long wait_sync,
 541         const char *logfilename
 542         )
 543 {
 544         int rc;
 545         int exit_code;
 546 #  if !defined(HAVE_SETSID) && !defined (HAVE_SETPGID) && defined(TIOCNOTTY)
 547         int             fid;
 548 #  endif
 549 #  ifdef _AIX
 550         struct sigaction sa;
 551 #  endif
 552
 553         rc = fork();
 554         if (-1 == rc) {
 555                 exit_code = (errno) ? errno : -1;
 556                 msyslog(LOG_ERR, "fork: %m");
 557                 exit(exit_code);
 558         }
 559         if (rc > 0) {
 560                 /* parent */
 561                 exit_code = wait_child_sync_if(pipe_fds[0],
 562                                                wait_sync);
 563                 exit(exit_code);
 564         }
 565
 566         /*
 567          * child/daemon
 568          * close all open files excepting waitsync_fd_to_close.
 569          * msyslog() unreliable until after init_logging().
 570          */
 571         closelog();
 572         if (syslog_file != NULL) {
 573                 fclose(syslog_file);
 574                 syslog_file = NULL;
 575                 syslogit = TRUE;
 576         }
 577         close_all_except(waitsync_fd_to_close);
 578         INSIST(0 == open("/dev/null", 0) && 1 == dup2(0, 1) \
 579                 && 2 == dup2(0, 2));
 580
 581         init_logging(progname, 0, TRUE);
 582         /* we lost our logfile (if any) daemonizing */
 583         setup_logfile(logfilename);
 584
 585 #  ifdef SYS_DOMAINOS
 586         {
 587                 uid_$t puid;
 588                 status_$t st;
 589
 590                 proc2_$who_am_i(&puid);
 591                 proc2_$make_server(&puid, &st);
 592         }
 593 #  endif        /* SYS_DOMAINOS */
 594 #  ifdef HAVE_SETSID
 595         if (setsid() == (pid_t)-1)
 596                 msyslog(LOG_ERR, "setsid(): %m");
 597 #  elif defined(HAVE_SETPGID)
 598         if (setpgid(0, 0) == -1)
 599                 msyslog(LOG_ERR, "setpgid(): %m");
 600 #  else         /* !HAVE_SETSID && !HAVE_SETPGID follows */
 601 #   ifdef TIOCNOTTY
 602         fid = open("/dev/tty", 2);
 603         if (fid >= 0) {
 604                 ioctl(fid, (u_long)TIOCNOTTY, NULL);
 605                 close(fid);
 606         }
 607 #   endif       /* TIOCNOTTY */
 608         ntp_setpgrp(0, getpid());
 609 #  endif        /* !HAVE_SETSID && !HAVE_SETPGID */
 610 #  ifdef _AIX
 611         /* Don't get killed by low-on-memory signal. */
 612         sa.sa_handler = catch_danger;
 613         sigemptyset(&sa.sa_mask);
 614         sa.sa_flags = SA_RESTART;
 615         sigaction(SIGDANGER, &sa, NULL);
 616 #  endif        /* _AIX */
 617
 618         return;
 619 }
 620
 621 #ifdef HAVE_DROPROOT
 622 /*
 623  * Map user name/number to user ID
 624 */
 625 static int
 626 map_user(
 627         )
 628 {
 629         char *endp;
 630
 631         if (isdigit((unsigned char)*user)) {
 632                 sw_uid = (uid_t)strtoul(user, &endp, 0);
 633                 if (*endp != '\0')
 634                         goto getuser;
 635
 636                 if ((pw = getpwuid(sw_uid)) != NULL) {
 637                         free(user);
 638                         user = estrdup(pw->pw_name);
 639                         sw_gid = pw->pw_gid;
 640                 } else {
 641                         errno = 0;
 642                         msyslog(LOG_ERR, "Cannot find user ID %s", user);
 643                         return 0;
 644                 }
 645
 646         } else {
 647 getuser:
 648                 errno = 0;
 649                 if ((pw = getpwnam(user)) != NULL) {
 650                         sw_uid = pw->pw_uid;
 651                         sw_gid = pw->pw_gid;
 652                 } else {
 653                         if (errno)
 654                                 msyslog(LOG_ERR, "getpwnam(%s) failed: %m", user);
 655                         else
 656                                 msyslog(LOG_ERR, "Cannot find user `%s'", user);
 657                         return 0;
 658                 }
 659         }
 660
 661         return 1;
 662 }
 663
 664 /*
 665  * Map group name/number to group ID
 666 */
 667 static int
 668 map_group(
 669         )
 670 {
 671         char *endp;
 672
 673         if (isdigit((unsigned char)*group)) {
 674                 sw_gid = (gid_t)strtoul(group, &endp, 0);
 675                 if (*endp != '\0')
 676                         goto getgroup;
 677         } else {
 678 getgroup:
 679                 if ((gr = getgrnam(group)) != NULL) {
 680                         sw_gid = gr->gr_gid;
 681                 } else {
 682                         errno = 0;
 683                         msyslog(LOG_ERR, "Cannot find group `%s'", group);
 684                         return 0;
 685                 }
 686         }
 687
 688         return 1;
 689 }
 690
 691 /*
 692  * Change (effective) user and group IDs, also initialize the supplementary group access list
 693  */
 694 int
 695 set_user_group_ids(
 696         )
 697 {
 698         /* If the the user was already mapped, no need to map it again */
 699         if ((NULL != user) && (0 == sw_uid)) {
 700                 if (0 == map_user())
 701                         exit (-1);
 702         }
 703         /* same applies for the group */
 704         if ((NULL != group) && (0 == sw_gid)) {
 705                 if (0 == map_group())
 706                         exit (-1);
 707         }
 708
 709         if (user && initgroups(user, sw_gid)) {
 710                 msyslog(LOG_ERR, "Cannot initgroups() to user `%s': %m", user);
 711                 return 0;
 712         }
 713         if (group && setgid(sw_gid)) {
 714                 msyslog(LOG_ERR, "Cannot setgid() to group `%s': %m", group);
 715                 return 0;
 716         }
 717         if (group && setegid(sw_gid)) {
 718                 msyslog(LOG_ERR, "Cannot setegid() to group `%s': %m", group);
 719                 return 0;
 720         }
 721         if (group) {
 722                 if (0 != setgroups(1, &sw_gid)) {
 723                         msyslog(LOG_ERR, "setgroups(1, %d) failed: %m", sw_gid);
 724                         return 0;
 725                 }
 726         }
 727         else if (pw)
 728                 if (0 != initgroups(pw->pw_name, pw->pw_gid)) {
 729                         msyslog(LOG_ERR, "initgroups(<%s>, %d) filed: %m", pw->pw_name, pw->pw_gid);
 730                         return 0;
 731                 }
 732         if (user && setuid(sw_uid)) {
 733                 msyslog(LOG_ERR, "Cannot setuid() to user `%s': %m", user);
 734                 return 0;
 735         }
 736         if (user && seteuid(sw_uid)) {
 737                 msyslog(LOG_ERR, "Cannot seteuid() to user `%s': %m", user);
 738                 return 0;
 739         }
 740
 741         return 1;
 742 }
 743 #endif /* HAVE_DROPROOT */
 744 #endif /* !SIM */
 745
 746 /*
 747  * Main program.  Initialize us, disconnect us from the tty if necessary,
 748  * and loop waiting for I/O and/or timer expiries.
 749  */
 750 #ifndef SIM
 751 int
 752 ntpdmain(
 753         int argc,
 754         char *argv[]
 755         )
 756 {
 757         l_fp            now;
 758         struct recvbuf *rbuf;
 759         const char *    logfilename;
 760 # ifdef HAVE_UMASK
 761         mode_t          uv;
 762 # endif
 763 # if defined(HAVE_GETUID) && !defined(MPE) /* MPE lacks the concept of root */
 764         uid_t           uid;
 765 # endif
 766 # if defined(HAVE_WORKING_FORK)
 767         long            wait_sync = 0;
 768         int             pipe_fds[2];
 769         int             rc;
 770         int             exit_code;
 771 # endif /* HAVE_WORKING_FORK*/
 772 # ifdef SCO5_CLOCK
 773         int             fd;
 774         int             zero;
 775 # endif
 776
 777 # ifdef NEED_PTHREAD_WARMUP
 778         my_pthread_warmup();
 779 # endif
 780
 781 # ifdef HAVE_UMASK
 782         uv = umask(0);
 783         if (uv)
 784                 umask(uv);
 785         else
 786                 umask(022);
 787 # endif
 788         saved_argc = argc;
 789         saved_argv = argv;
 790         progname = argv[0];
 791         initializing = TRUE;            /* mark that we are initializing */
 792         parse_cmdline_opts(&argc, &argv);
 793 # ifdef DEBUG
 794         debug = OPT_VALUE_SET_DEBUG_LEVEL;
 795 #  ifdef HAVE_SETLINEBUF
 796         setlinebuf(stdout);
 797 #  endif
 798 # endif
 799
 800         if (HAVE_OPT(NOFORK) || HAVE_OPT(QUIT)
 801 # ifdef DEBUG
 802             || debug
 803 # endif
 804             || HAVE_OPT(SAVECONFIGQUIT))
 805                 nofork = TRUE;
 806
 807         init_logging(progname, NLOG_SYNCMASK, TRUE);
 808         /* honor -l/--logfile option to log to a file */
 809         if (HAVE_OPT(LOGFILE)) {
 810                 logfilename = OPT_ARG(LOGFILE);
 811                 syslogit = FALSE;
 812                 change_logfile(logfilename, FALSE);
 813         } else {
 814                 logfilename = NULL;
 815                 if (nofork)
 816                         msyslog_term = TRUE;
 817                 if (HAVE_OPT(SAVECONFIGQUIT))
 818                         syslogit = FALSE;
 819         }
 820         msyslog(LOG_NOTICE, "%s: Starting", Version);
 821
 822         {
 823                 int i;
 824                 char buf[1024]; /* Secret knowledge of msyslog buf length */
 825                 char *cp = buf;
 826
 827                 /* Note that every arg has an initial space character */
 828                 snprintf(cp, sizeof(buf), "Command line:");
 829                 cp += strlen(cp);
 830
 831                 for (i = 0; i < saved_argc ; ++i) {
 832                         snprintf(cp, sizeof(buf) - (cp - buf),
 833                                 " %s", saved_argv[i]);
 834                         cp += strlen(cp);
 835                 }
 836                 msyslog(LOG_INFO, "%s", buf);
 837         }
 838
 839         /*
 840          * Install trap handlers to log errors and assertion failures.
 841          * Default handlers print to stderr which doesn't work if detached.
 842          */
 843         isc_assertion_setcallback(assertion_failed);
 844         isc_error_setfatal(library_fatal_error);
 845         isc_error_setunexpected(library_unexpected_error);
 846
 847         /* MPE lacks the concept of root */
 848 # if defined(HAVE_GETUID) && !defined(MPE)
 849         uid = getuid();
 850         if (uid && !HAVE_OPT( SAVECONFIGQUIT )
 851 #  if defined(HAVE_TRUSTEDBSD_MAC)
 852             /* We can run as non-root if the mac_ntpd policy is enabled. */
 853             && mac_is_present("ntpd") != 1
 854 #  endif
 855             ) {
 856                 msyslog_term = TRUE;
 857                 msyslog(LOG_ERR,
 858                         "must be run as root, not uid %ld", (long)uid);
 859                 exit(1);
 860         }
 861 # endif
 862
 863 /*
 864  * Enable the Multi-Media Timer for Windows?
 865  */
 866 # ifdef SYS_WINNT
 867         if (HAVE_OPT( MODIFYMMTIMER ))
 868                 set_mm_timer(MM_TIMER_HIRES);
 869 # endif
 870
 871 #ifdef HAVE_DNSREGISTRATION
 872 /*
 873  * Enable mDNS registrations?
 874  */
 875         if (HAVE_OPT( MDNS )) {
 876                 mdnsreg = TRUE;
 877         }
 878 #endif  /* HAVE_DNSREGISTRATION */
 879
 880         if (HAVE_OPT( NOVIRTUALIPS ))
 881                 listen_to_virtual_ips = 0;
 882
 883         /*
 884          * --interface, listen on specified interfaces
 885          */
 886         if (HAVE_OPT( INTERFACE )) {
 887                 int             ifacect = STACKCT_OPT( INTERFACE );
 888                 const char**    ifaces  = STACKLST_OPT( INTERFACE );
 889                 sockaddr_u      addr;
 890
 891                 while (ifacect-- > 0) {
 892                         add_nic_rule(
 893                                 is_ip_address(*ifaces, AF_UNSPEC, &addr)
 894                                         ? MATCH_IFADDR
 895                                         : MATCH_IFNAME,
 896                                 *ifaces, -1, ACTION_LISTEN);
 897                         ifaces++;
 898                 }
 899         }
 900
 901         if (HAVE_OPT( NICE ))
 902                 priority_done = 0;
 903
 904 # ifdef HAVE_SCHED_SETSCHEDULER
 905         if (HAVE_OPT( PRIORITY )) {
 906                 config_priority = OPT_VALUE_PRIORITY;
 907                 config_priority_override = 1;
 908                 priority_done = 0;
 909         }
 910 # endif
 911
 912 # ifdef HAVE_WORKING_FORK
 913         /* make sure the FDs are initialised */
 914         pipe_fds[0] = -1;
 915         pipe_fds[1] = -1;
 916         do {                                    /* 'loop' once */
 917                 if (!HAVE_OPT( WAIT_SYNC ))
 918                         break;
 919                 wait_sync = OPT_VALUE_WAIT_SYNC;
 920                 if (wait_sync <= 0) {
 921                         wait_sync = 0;
 922                         break;
 923                 }
 924                 /* -w requires a fork() even with debug > 0 */
 925                 nofork = FALSE;
 926                 if (pipe(pipe_fds)) {
 927                         exit_code = (errno) ? errno : -1;
 928                         msyslog(LOG_ERR,
 929                                 "Pipe creation failed for --wait-sync: %m");
 930                         exit(exit_code);
 931                 }
 932                 waitsync_fd_to_close = pipe_fds[1];
 933         } while (0);                            /* 'loop' once */
 934 # endif /* HAVE_WORKING_FORK */
 935
 936         init_lib();
 937 # ifdef SYS_WINNT
 938         /*
 939          * Make sure the service is initialized before we do anything else
 940          */
 941         ntservice_init();
 942
 943         /*
 944          * Start interpolation thread, must occur before first
 945          * get_systime()
 946          */
 947         init_winnt_time();
 948 # endif
 949         /*
 950          * Initialize random generator and public key pair
 951          */
 952         get_systime(&now);
 953
 954         ntp_srandom((int)(now.l_i * now.l_uf));
 955
 956         /*
 957          * Detach us from the terminal.  May need an #ifndef GIZMO.
 958          */
 959         if (!nofork) {
 960
 961 # ifdef HAVE_WORKING_FORK
 962                 detach_from_terminal(pipe_fds, wait_sync, logfilename);
 963 # endif         /* HAVE_WORKING_FORK */
 964         }
 965
 966 # ifdef SCO5_CLOCK
 967         /*
 968          * SCO OpenServer's system clock offers much more precise timekeeping
 969          * on the base CPU than the other CPUs (for multiprocessor systems),
 970          * so we must lock to the base CPU.
 971          */
 972         fd = open("/dev/at1", O_RDONLY);
 973         if (fd >= 0) {
 974                 zero = 0;
 975                 if (ioctl(fd, ACPU_LOCK, &zero) < 0)
 976                         msyslog(LOG_ERR, "cannot lock to base CPU: %m");
 977                 close(fd);
 978         }
 979 # endif
 980
 981         /* Setup stack size in preparation for locking pages in memory. */
 982 # if defined(HAVE_MLOCKALL)
 983 #  ifdef HAVE_SETRLIMIT
 984         ntp_rlimit(RLIMIT_STACK, DFLT_RLIMIT_STACK * 4096, 4096, "4k");
 985 #   ifdef RLIMIT_MEMLOCK
 986         /*
 987          * The default RLIMIT_MEMLOCK is very low on Linux systems.
 988          * Unless we increase this limit malloc calls are likely to
 989          * fail if we drop root privilege.  To be useful the value
 990          * has to be larger than the largest ntpd resident set size.
 991          */
 992         ntp_rlimit(RLIMIT_MEMLOCK, DFLT_RLIMIT_MEMLOCK * 1024 * 1024, 1024 * 1024, "MB");
 993 #   endif       /* RLIMIT_MEMLOCK */
 994 #  endif        /* HAVE_SETRLIMIT */
 995 # else  /* !HAVE_MLOCKALL follows */
 996 #  ifdef HAVE_PLOCK
 997 #   ifdef PROCLOCK
 998 #    ifdef _AIX
 999         /*
1000          * set the stack limit for AIX for plock().
1001          * see get_aix_stack() for more info.
1002          */
1003         if (ulimit(SET_STACKLIM, (get_aix_stack() - 8 * 4096)) < 0)
1004                 msyslog(LOG_ERR,
1005                         "Cannot adjust stack limit for plock: %m");
1006 #    endif      /* _AIX */
1007 #   endif       /* PROCLOCK */
1008 #  endif        /* HAVE_PLOCK */
1009 # endif /* !HAVE_MLOCKALL */
1010
1011         /*
1012          * Set up signals we pay attention to locally.
1013          */
1014 # ifdef SIGDIE1
1015         signal_no_reset(SIGDIE1, finish);
1016         signal_no_reset(SIGDIE2, finish);
1017         signal_no_reset(SIGDIE3, finish);
1018         signal_no_reset(SIGDIE4, finish);
1019 # endif
1020 # ifdef SIGBUS
1021         signal_no_reset(SIGBUS, finish);
1022 # endif
1023
1024 # if !defined(SYS_WINNT) && !defined(VMS)
1025 #  ifdef DEBUG
1026         (void) signal_no_reset(MOREDEBUGSIG, moredebug);
1027         (void) signal_no_reset(LESSDEBUGSIG, lessdebug);
1028 #  else
1029         (void) signal_no_reset(MOREDEBUGSIG, no_debug);
1030         (void) signal_no_reset(LESSDEBUGSIG, no_debug);
1031 #  endif        /* DEBUG */
1032 # endif /* !SYS_WINNT && !VMS */
1033
1034         /*
1035          * Set up signals we should never pay attention to.
1036          */
1037 # ifdef SIGPIPE
1038         signal_no_reset(SIGPIPE, SIG_IGN);
1039 # endif
1040
1041         /*
1042          * Call the init_ routines to initialize the data structures.
1043          *
1044          * Exactly what command-line options are we expecting here?
1045          */
1046         INIT_SSL();
1047         init_auth();
1048         init_util();
1049         init_restrict();
1050         init_mon();
1051         init_timer();
1052         init_request();
1053         init_control();
1054         init_peer();
1055 # ifdef REFCLOCK
1056         init_refclock();
1057 # endif
1058         set_process_priority();
1059         init_proto();           /* Call at high priority */
1060         init_io();
1061         init_loopfilter();
1062         mon_start(MON_ON);      /* monitor on by default now      */
1063                                 /* turn off in config if unwanted */
1064
1065         /*
1066          * Get the configuration.  This is done in a separate module
1067          * since this will definitely be different for the gizmo board.
1068          */
1069         getconfig(argc, argv);
1070
1071         if (-1 == cur_memlock) {
1072 # if defined(HAVE_MLOCKALL)
1073                 /*
1074                  * lock the process into memory
1075                  */
1076                 if (   !HAVE_OPT(SAVECONFIGQUIT)
1077 #  ifdef RLIMIT_MEMLOCK
1078                     && -1 != DFLT_RLIMIT_MEMLOCK
1079 #  endif
1080                     && 0 != mlockall(MCL_CURRENT|MCL_FUTURE))
1081                         msyslog(LOG_ERR, "mlockall(): %m");
1082 # else  /* !HAVE_MLOCKALL follows */
1083 #  ifdef HAVE_PLOCK
1084 #   ifdef PROCLOCK
1085                 /*
1086                  * lock the process into memory
1087                  */
1088                 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(PROCLOCK))
1089                         msyslog(LOG_ERR, "plock(PROCLOCK): %m");
1090 #   else        /* !PROCLOCK follows  */
1091 #    ifdef TXTLOCK
1092                 /*
1093                  * Lock text into ram
1094                  */
1095                 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(TXTLOCK))
1096                         msyslog(LOG_ERR, "plock(TXTLOCK) error: %m");
1097 #    else       /* !TXTLOCK follows */
1098                 msyslog(LOG_ERR, "plock() - don't know what to lock!");
1099 #    endif      /* !TXTLOCK */
1100 #   endif       /* !PROCLOCK */
1101 #  endif        /* HAVE_PLOCK */
1102 # endif /* !HAVE_MLOCKALL */
1103         }
1104
1105         loop_config(LOOP_DRIFTINIT, 0);
1106         report_event(EVNT_SYSRESTART, NULL, NULL);
1107         initializing = FALSE;
1108
1109 # ifdef HAVE_DROPROOT
1110         if (droproot) {
1111
1112 #ifdef NEED_EARLY_FORK
1113                 fork_nonchroot_worker();
1114 #endif
1115
1116                 /* Drop super-user privileges and chroot now if the OS supports this */
1117
1118 #  ifdef HAVE_LINUX_CAPABILITIES
1119                 /* set flag: keep privileges accross setuid() call (we only really need cap_sys_time): */
1120                 if (prctl( PR_SET_KEEPCAPS, 1L, 0L, 0L, 0L ) == -1) {
1121                         msyslog( LOG_ERR, "prctl( PR_SET_KEEPCAPS, 1L ) failed: %m" );
1122                         exit(-1);
1123                 }
1124 #  elif HAVE_SOLARIS_PRIVS
1125                 /* Nothing to do here */
1126 #  else
1127                 /* we need a user to switch to */
1128                 if (user == NULL) {
1129                         msyslog(LOG_ERR, "Need user name to drop root privileges (see -u flag!)" );
1130                         exit(-1);
1131                 }
1132 #  endif        /* HAVE_LINUX_CAPABILITIES || HAVE_SOLARIS_PRIVS */
1133
1134                 if (user != NULL) {
1135                         if (0 == map_user())
1136                                 exit (-1);
1137                 }
1138                 if (group != NULL) {
1139                         if (0 == map_group())
1140                                 exit (-1);
1141                 }
1142
1143                 if (chrootdir ) {
1144                         /* make sure cwd is inside the jail: */
1145                         if (chdir(chrootdir)) {
1146                                 msyslog(LOG_ERR, "Cannot chdir() to `%s': %m", chrootdir);
1147                                 exit (-1);
1148                         }
1149                         if (chroot(chrootdir)) {
1150                                 msyslog(LOG_ERR, "Cannot chroot() to `%s': %m", chrootdir);
1151                                 exit (-1);
1152                         }
1153                         if (chdir("/")) {
1154                                 msyslog(LOG_ERR, "Cannot chdir() to`root after chroot(): %m");
1155                                 exit (-1);
1156                         }
1157                 }
1158 #  ifdef HAVE_SOLARIS_PRIVS
1159                 if ((lowprivs = priv_str_to_set(LOWPRIVS, ",", NULL)) == NULL) {
1160                         msyslog(LOG_ERR, "priv_str_to_set() failed:%m");
1161                         exit(-1);
1162                 }
1163                 if ((highprivs = priv_allocset()) == NULL) {
1164                         msyslog(LOG_ERR, "priv_allocset() failed:%m");
1165                         exit(-1);
1166                 }
1167                 (void) getppriv(PRIV_PERMITTED, highprivs);
1168                 (void) priv_intersect(highprivs, lowprivs);
1169                 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) {
1170                         msyslog(LOG_ERR, "setppriv() failed:%m");
1171                         exit(-1);
1172                 }
1173 #  endif /* HAVE_SOLARIS_PRIVS */
1174                 if (0 == set_user_group_ids())
1175                         exit(-1);
1176
1177 #  if defined(HAVE_TRUSTEDBSD_MAC)
1178                 /*
1179                  * To manipulate system time and (re-)bind to NTP_PORT as needed
1180                  * following interface changes, we must either run as uid 0 or
1181                  * the mac_ntpd policy module must be enabled.
1182                  */
1183                 if (sw_uid != 0 && mac_is_present("ntpd") != 1) {
1184                         msyslog(LOG_ERR, "Need MAC 'ntpd' policy enabled to drop root privileges");
1185                         exit (-1);
1186                 }
1187 #  elif !defined(HAVE_LINUX_CAPABILITIES) && !defined(HAVE_SOLARIS_PRIVS)
1188                 /*
1189                  * for now assume that the privilege to bind to privileged ports
1190                  * is associated with running with uid 0 - should be refined on
1191                  * ports that allow binding to NTP_PORT with uid != 0
1192                  */
1193                 disable_dynamic_updates |= (sw_uid != 0);  /* also notifies routing message listener */
1194 #  endif /* !HAVE_LINUX_CAPABILITIES && !HAVE_SOLARIS_PRIVS */
1195
1196                 if (disable_dynamic_updates && interface_interval) {
1197                         interface_interval = 0;
1198                         msyslog(LOG_INFO, "running as non-root disables dynamic interface tracking");
1199                 }
1200
1201 #  ifdef HAVE_LINUX_CAPABILITIES
1202                 {
1203                         /*
1204                          *  We may be running under non-root uid now, but we still hold full root privileges!
1205                          *  We drop all of them, except for the crucial one or two: cap_sys_time and
1206                          *  cap_net_bind_service if doing dynamic interface tracking.
1207                          */
1208                         cap_t caps;
1209                         char *captext;
1210
1211                         captext = (0 != interface_interval)
1212                                       ? "cap_sys_time,cap_net_bind_service=pe"
1213                                       : "cap_sys_time=pe";
1214                         caps = cap_from_text(captext);
1215                         if (!caps) {
1216                                 msyslog(LOG_ERR,
1217                                         "cap_from_text(%s) failed: %m",
1218                                         captext);
1219                                 exit(-1);
1220                         }
1221                         if (-1 == cap_set_proc(caps)) {
1222                                 msyslog(LOG_ERR,
1223                                         "cap_set_proc() failed to drop root privs: %m");
1224                                 exit(-1);
1225                         }
1226                         cap_free(caps);
1227                 }
1228 #  endif        /* HAVE_LINUX_CAPABILITIES */
1229 #  ifdef HAVE_SOLARIS_PRIVS
1230                 if (priv_delset(lowprivs, "proc_setid") == -1) {
1231                         msyslog(LOG_ERR, "priv_delset() failed:%m");
1232                         exit(-1);
1233                 }
1234                 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) {
1235                         msyslog(LOG_ERR, "setppriv() failed:%m");
1236                         exit(-1);
1237                 }
1238                 priv_freeset(lowprivs);
1239                 priv_freeset(highprivs);
1240 #  endif /* HAVE_SOLARIS_PRIVS */
1241                 root_dropped = TRUE;
1242                 fork_deferred_worker();
1243         }       /* if (droproot) */
1244 # endif /* HAVE_DROPROOT */
1245
1246 /* libssecomp sandboxing */
1247 #if defined (LIBSECCOMP) && (KERN_SECCOMP)
1248         scmp_filter_ctx ctx;
1249
1250         if ((ctx = seccomp_init(SCMP_ACT_KILL)) < 0)
1251                 msyslog(LOG_ERR, "%s: seccomp_init(SCMP_ACT_KILL) failed: %m", __func__);
1252         else {
1253                 msyslog(LOG_DEBUG, "%s: seccomp_init(SCMP_ACT_KILL) succeeded", __func__);
1254         }
1255
1256 #ifdef __x86_64__
1257 int scmp_sc[] = {
1258         SCMP_SYS(adjtimex),
1259         SCMP_SYS(bind),
1260         SCMP_SYS(brk),
1261         SCMP_SYS(chdir),
1262         SCMP_SYS(clock_gettime),
1263         SCMP_SYS(clock_settime),
1264         SCMP_SYS(close),
1265         SCMP_SYS(connect),
1266         SCMP_SYS(exit_group),
1267         SCMP_SYS(fstat),
1268         SCMP_SYS(fsync),
1269         SCMP_SYS(futex),
1270         SCMP_SYS(getitimer),
1271         SCMP_SYS(getsockname),
1272         SCMP_SYS(ioctl),
1273         SCMP_SYS(lseek),
1274         SCMP_SYS(madvise),
1275         SCMP_SYS(mmap),
1276         SCMP_SYS(munmap),
1277         SCMP_SYS(open),
1278         SCMP_SYS(poll),
1279         SCMP_SYS(read),
1280         SCMP_SYS(recvmsg),
1281         SCMP_SYS(rename),
1282         SCMP_SYS(rt_sigaction),
1283         SCMP_SYS(rt_sigprocmask),
1284         SCMP_SYS(rt_sigreturn),
1285         SCMP_SYS(select),
1286         SCMP_SYS(sendto),
1287         SCMP_SYS(setitimer),
1288         SCMP_SYS(setsid),
1289         SCMP_SYS(socket),
1290         SCMP_SYS(stat),
1291         SCMP_SYS(time),
1292         SCMP_SYS(write),
1293 };
1294 #endif
1295 #ifdef __i386__
1296 int scmp_sc[] = {
1297         SCMP_SYS(_newselect),
1298         SCMP_SYS(adjtimex),
1299         SCMP_SYS(brk),
1300         SCMP_SYS(chdir),
1301         SCMP_SYS(clock_gettime),
1302         SCMP_SYS(clock_settime),
1303         SCMP_SYS(close),
1304         SCMP_SYS(exit_group),
1305         SCMP_SYS(fsync),
1306         SCMP_SYS(futex),
1307         SCMP_SYS(getitimer),
1308         SCMP_SYS(madvise),
1309         SCMP_SYS(mmap),
1310         SCMP_SYS(mmap2),
1311         SCMP_SYS(munmap),
1312         SCMP_SYS(open),
1313         SCMP_SYS(poll),
1314         SCMP_SYS(read),
1315         SCMP_SYS(rename),
1316         SCMP_SYS(rt_sigaction),
1317         SCMP_SYS(rt_sigprocmask),
1318         SCMP_SYS(select),
1319         SCMP_SYS(setitimer),
1320         SCMP_SYS(setsid),
1321         SCMP_SYS(sigprocmask),
1322         SCMP_SYS(sigreturn),
1323         SCMP_SYS(socketcall),
1324         SCMP_SYS(stat64),
1325         SCMP_SYS(time),
1326         SCMP_SYS(write),
1327 };
1328 #endif
1329         {
1330                 int i;
1331
1332                 for (i = 0; i < COUNTOF(scmp_sc); i++) {
1333                         if (seccomp_rule_add(ctx,
1334                             SCMP_ACT_ALLOW, scmp_sc[i], 0) < 0) {
1335                                 msyslog(LOG_ERR,
1336                                     "%s: seccomp_rule_add() failed: %m",
1337                                     __func__);
1338                         }
1339                 }
1340         }
1341
1342         if (seccomp_load(ctx) < 0)
1343                 msyslog(LOG_ERR, "%s: seccomp_load() failed: %m",
1344                     __func__);
1345         else {
1346                 msyslog(LOG_DEBUG, "%s: seccomp_load() succeeded", __func__);
1347         }
1348 #endif /* LIBSECCOMP and KERN_SECCOMP */
1349
1350 #ifdef SYS_WINNT
1351         ntservice_isup();
1352 #endif
1353
1354 # ifdef HAVE_IO_COMPLETION_PORT
1355
1356         for (;;) {
1357 #if !defined(SIM) && defined(SIGDIE1)
1358                 if (signalled)
1359                         finish_safe(signo);
1360 #endif
1361                 GetReceivedBuffers();
1362 # else /* normal I/O */
1363
1364         BLOCK_IO_AND_ALARM();
1365         was_alarmed = FALSE;
1366
1367         for (;;) {
1368 #if !defined(SIM) && defined(SIGDIE1)
1369                 if (signalled)
1370                         finish_safe(signo);
1371 #endif
1372                 if (alarm_flag) {       /* alarmed? */
1373                         was_alarmed = TRUE;
1374                         alarm_flag = FALSE;
1375                 }
1376
1377                 /* collect async name/addr results */
1378                 if (!was_alarmed)
1379                     harvest_blocking_responses();
1380
1381                 if (!was_alarmed && !has_full_recv_buffer()) {
1382                         /*
1383                          * Nothing to do.  Wait for something.
1384                          */
1385                         io_handler();
1386                 }
1387
1388                 if (alarm_flag) {       /* alarmed? */
1389                         was_alarmed = TRUE;
1390                         alarm_flag = FALSE;
1391                 }
1392
1393                 if (was_alarmed) {
1394                         UNBLOCK_IO_AND_ALARM();
1395                         /*
1396                          * Out here, signals are unblocked.  Call timer routine
1397                          * to process expiry.
1398                          */
1399                         timer();
1400                         was_alarmed = FALSE;
1401                         BLOCK_IO_AND_ALARM();
1402                 }
1403
1404 # endif         /* !HAVE_IO_COMPLETION_PORT */
1405
1406 # ifdef DEBUG_TIMING
1407                 {
1408                         l_fp pts;
1409                         l_fp tsa, tsb;
1410                         int bufcount = 0;
1411
1412                         get_systime(&pts);
1413                         tsa = pts;
1414 # endif
1415                         rbuf = get_full_recv_buffer();
1416                         while (rbuf != NULL) {
1417                                 if (alarm_flag) {
1418                                         was_alarmed = TRUE;
1419                                         alarm_flag = FALSE;
1420                                 }
1421                                 UNBLOCK_IO_AND_ALARM();
1422
1423                                 if (was_alarmed) {
1424                                         /* avoid timer starvation during lengthy I/O handling */
1425                                         timer();
1426                                         was_alarmed = FALSE;
1427                                 }
1428
1429                                 /*
1430                                  * Call the data procedure to handle each received
1431                                  * packet.
1432                                  */
1433                                 if (rbuf->receiver != NULL) {
1434 # ifdef DEBUG_TIMING
1435                                         l_fp dts = pts;
1436
1437                                         L_SUB(&dts, &rbuf->recv_time);
1438                                         DPRINTF(2, ("processing timestamp delta %s (with prec. fuzz)\n", lfptoa(&dts, 9)));
1439                                         collect_timing(rbuf, "buffer processing delay", 1, &dts);
1440                                         bufcount++;
1441 # endif
1442                                         (*rbuf->receiver)(rbuf);
1443                                 } else {
1444                                         msyslog(LOG_ERR, "fatal: receive buffer callback NULL");
1445                                         abort();
1446                                 }
1447
1448                                 BLOCK_IO_AND_ALARM();
1449                                 freerecvbuf(rbuf);
1450                                 rbuf = get_full_recv_buffer();
1451                         }
1452 # ifdef DEBUG_TIMING
1453                         get_systime(&tsb);
1454                         L_SUB(&tsb, &tsa);
1455                         if (bufcount) {
1456                                 collect_timing(NULL, "processing", bufcount, &tsb);
1457                                 DPRINTF(2, ("processing time for %d buffers %s\n", bufcount, lfptoa(&tsb, 9)));
1458                         }
1459                 }
1460 # endif
1461
1462                 /*
1463                  * Go around again
1464                  */
1465
1466 # ifdef HAVE_DNSREGISTRATION
1467                 if (mdnsreg && (current_time - mdnsreg ) > 60 && mdnstries && sys_leap != LEAP_NOTINSYNC) {
1468                         mdnsreg = current_time;
1469                         msyslog(LOG_INFO, "Attempting to register mDNS");
1470                         if ( DNSServiceRegister (&mdns, 0, 0, NULL, "_ntp._udp", NULL, NULL,
1471                             htons(NTP_PORT), 0, NULL, NULL, NULL) != kDNSServiceErr_NoError ) {
1472                                 if (!--mdnstries) {
1473                                         msyslog(LOG_ERR, "Unable to register mDNS, giving up.");
1474                                 } else {
1475                                         msyslog(LOG_INFO, "Unable to register mDNS, will try later.");
1476                                 }
1477                         } else {
1478                                 msyslog(LOG_INFO, "mDNS service registered.");
1479                                 mdnsreg = FALSE;
1480                         }
1481                 }
1482 # endif /* HAVE_DNSREGISTRATION */
1483
1484         }
1485         UNBLOCK_IO_AND_ALARM();
1486         return 1;
1487 }
1488 #endif  /* !SIM */
1489
1490
1491 #if !defined(SIM) && defined(SIGDIE1)
1492 /*
1493  * finish - exit gracefully
1494  */
1495 static void
1496 finish_safe(
1497         int     sig
1498         )
1499 {
1500         const char *sig_desc;
1501
1502         sig_desc = NULL;
1503 #ifdef HAVE_STRSIGNAL
1504         sig_desc = strsignal(sig);
1505 #endif
1506         if (sig_desc == NULL)
1507                 sig_desc = "";
1508         msyslog(LOG_NOTICE, "%s exiting on signal %d (%s)", progname,
1509                 sig, sig_desc);
1510         /* See Bug 2513 and Bug 2522 re the unlink of PIDFILE */
1511 # ifdef HAVE_DNSREGISTRATION
1512         if (mdns != NULL)
1513                 DNSServiceRefDeallocate(mdns);
1514 # endif
1515         peer_cleanup();
1516         exit(0);
1517 }
1518
1519 static RETSIGTYPE
1520 finish(
1521         int     sig
1522         )
1523 {
1524         signalled = 1;
1525         signo = sig;
1526 }
1527
1528 #endif  /* !SIM && SIGDIE1 */
1529
1530
1531 #ifndef SIM
1532 /*
1533  * wait_child_sync_if - implements parent side of -w/--wait-sync
1534  */
1535 # ifdef HAVE_WORKING_FORK
1536 static int
1537 wait_child_sync_if(
1538         int     pipe_read_fd,
1539         long    wait_sync
1540         )
1541 {
1542         int     rc;
1543         int     exit_code;
1544         time_t  wait_end_time;
1545         time_t  cur_time;
1546         time_t  wait_rem;
1547         fd_set  readset;
1548         struct timeval wtimeout;
1549
1550         if (0 == wait_sync)
1551                 return 0;
1552
1553         /* waitsync_fd_to_close used solely by child */
1554         close(waitsync_fd_to_close);
1555         wait_end_time = time(NULL) + wait_sync;
1556         do {
1557                 cur_time = time(NULL);
1558                 wait_rem = (wait_end_time > cur_time)
1559                                 ? (wait_end_time - cur_time)
1560                                 : 0;
1561                 wtimeout.tv_sec = wait_rem;
1562                 wtimeout.tv_usec = 0;
1563                 FD_ZERO(&readset);
1564                 FD_SET(pipe_read_fd, &readset);
1565                 rc = select(pipe_read_fd + 1, &readset, NULL, NULL,
1566                             &wtimeout);
1567                 if (-1 == rc) {
1568                         if (EINTR == errno)
1569                                 continue;
1570                         exit_code = (errno) ? errno : -1;
1571                         msyslog(LOG_ERR,
1572                                 "--wait-sync select failed: %m");
1573                         return exit_code;
1574                 }
1575                 if (0 == rc) {
1576                         /*
1577                          * select() indicated a timeout, but in case
1578                          * its timeouts are affected by a step of the
1579                          * system clock, select() again with a zero
1580                          * timeout to confirm.
1581                          */
1582                         FD_ZERO(&readset);
1583                         FD_SET(pipe_read_fd, &readset);
1584                         wtimeout.tv_sec = 0;
1585                         wtimeout.tv_usec = 0;
1586                         rc = select(pipe_read_fd + 1, &readset, NULL,
1587                                     NULL, &wtimeout);
1588                         if (0 == rc)    /* select() timeout */
1589                                 break;
1590                         else            /* readable */
1591                                 return 0;
1592                 } else                  /* readable */
1593                         return 0;
1594         } while (wait_rem > 0);
1595
1596         fprintf(stderr, "%s: -w/--wait-sync %ld timed out.\n",
1597                 progname, wait_sync);
1598         return ETIMEDOUT;
1599 }
1600 # endif /* HAVE_WORKING_FORK */
1601
1602
1603 /*
1604  * assertion_failed - Redirect assertion failures to msyslog().
1605  */
1606 static void
1607 assertion_failed(
1608         const char *file,
1609         int line,
1610         isc_assertiontype_t type,
1611         const char *cond
1612         )
1613 {
1614         isc_assertion_setcallback(NULL);    /* Avoid recursion */
1615
1616         msyslog(LOG_ERR, "%s:%d: %s(%s) failed",
1617                 file, line, isc_assertion_typetotext(type), cond);
1618         msyslog(LOG_ERR, "exiting (due to assertion failure)");
1619
1620 #if defined(DEBUG) && defined(SYS_WINNT)
1621         if (debug)
1622                 DebugBreak();
1623 #endif
1624
1625         abort();
1626 }
1627
1628
1629 /*
1630  * library_fatal_error - Handle fatal errors from our libraries.
1631  */
1632 static void
1633 library_fatal_error(
1634         const char *file,
1635         int line,
1636         const char *format,
1637         va_list args
1638         )
1639 {
1640         char errbuf[256];
1641
1642         isc_error_setfatal(NULL);  /* Avoid recursion */
1643
1644         msyslog(LOG_ERR, "%s:%d: fatal error:", file, line);
1645         vsnprintf(errbuf, sizeof(errbuf), format, args);
1646         msyslog(LOG_ERR, "%s", errbuf);
1647         msyslog(LOG_ERR, "exiting (due to fatal error in library)");
1648
1649 #if defined(DEBUG) && defined(SYS_WINNT)
1650         if (debug)
1651                 DebugBreak();
1652 #endif
1653
1654         abort();
1655 }
1656
1657
1658 /*
1659  * library_unexpected_error - Handle non fatal errors from our libraries.
1660  */
1661 # define MAX_UNEXPECTED_ERRORS 100
1662 int unexpected_error_cnt = 0;
1663 static void
1664 library_unexpected_error(
1665         const char *file,
1666         int line,
1667         const char *format,
1668         va_list args
1669         )
1670 {
1671         char errbuf[256];
1672
1673         if (unexpected_error_cnt >= MAX_UNEXPECTED_ERRORS)
1674                 return; /* avoid clutter in log */
1675
1676         msyslog(LOG_ERR, "%s:%d: unexpected error:", file, line);
1677         vsnprintf(errbuf, sizeof(errbuf), format, args);
1678         msyslog(LOG_ERR, "%s", errbuf);
1679
1680         if (++unexpected_error_cnt == MAX_UNEXPECTED_ERRORS)
1681                 msyslog(LOG_ERR, "Too many errors.  Shutting up.");
1682
1683 }
1684 #endif  /* !SIM */
1685
1686 #if !defined(SIM) && !defined(SYS_WINNT)
1687 # ifdef DEBUG
1688
1689 /*
1690  * moredebug - increase debugging verbosity
1691  */
1692 static RETSIGTYPE
1693 moredebug(
1694         int sig
1695         )
1696 {
1697         int saved_errno = errno;
1698
1699         if (debug < 255)
1700         {
1701                 debug++;
1702                 msyslog(LOG_DEBUG, "debug raised to %d", debug);
1703         }
1704         errno = saved_errno;
1705 }
1706
1707
1708 /*
1709  * lessdebug - decrease debugging verbosity
1710  */
1711 static RETSIGTYPE
1712 lessdebug(
1713         int sig
1714         )
1715 {
1716         int saved_errno = errno;
1717
1718         if (debug > 0)
1719         {
1720                 debug--;
1721                 msyslog(LOG_DEBUG, "debug lowered to %d", debug);
1722         }
1723         errno = saved_errno;
1724 }
1725
1726 # else  /* !DEBUG follows */
1727
1728
1729 /*
1730  * no_debug - We don't do the debug here.
1731  */
1732 static RETSIGTYPE
1733 no_debug(
1734         int sig
1735         )
1736 {
1737         int saved_errno = errno;
1738
1739         msyslog(LOG_DEBUG, "ntpd not compiled for debugging (signal %d)", sig);
1740         errno = saved_errno;
1741 }
1742 # endif /* !DEBUG */
1743 #endif  /* !SIM && !SYS_WINNT */