1 /* 2 * ntpd.h - Prototypes and external variables for ntpd. 3 * 4 * Note the first half is primarily function prototypes, type 5 * declarations, and preprocessor macros, with variables declared 6 * primarily in the second half. 7 * 8 * Each half is further divided into sections for each source file. 9 */ 10 11 #include "ntp.h" 12 #include "ntp_stdlib.h" 13 #include "ntp_syslog.h" 14 #include "ntp_debug.h" 15 #include "ntp_syslog.h" 16 #include "ntp_select.h" 17 #include "ntp_malloc.h" 18 #include "ntp_refclock.h" 19 #include "ntp_intres.h" 20 #include "recvbuff.h" 21 22 /* 23 * First half: ntpd types, functions, macros 24 * ----------------------------------------- 25 */ 26 27 /* 28 * macro for debugging output - cut down on #ifdef pollution. 29 * 30 * DPRINTF() is for use by ntpd only, and compiles away to nothing 31 * without DEBUG (configure --disable-debugging). 32 * 33 * TRACE() is similar for libntp and utilities, which retain full 34 * debug capability even when compiled without DEBUG. 35 * 36 * The calling convention is not attractive: 37 * DPRINTF(debuglevel, (fmt, ...)); 38 * DPRINTF(2, ("shows #ifdef DEBUG and if debug >= %d\n", 2)); 39 */ 40 #ifdef DEBUG 41 # define DPRINTF(lvl, arg) \ 42 do { \ 43 if (debug >= (lvl)) \ 44 mprintf arg; \ 45 } while (0) 46 #else 47 # define DPRINTF(lvl, arg) do {} while (0) 48 #endif 49 50 51 /* nt_clockstuff.c */ 52 #ifdef SYS_WINNT 53 extern void win_time_stepped(void); 54 #endif 55 56 /* ntp_config.c */ 57 #define TAI_1972 10 /* initial TAI offset (s) */ 58 extern char *keysdir; /* crypto keys and leaptable directory */ 59 extern char * saveconfigdir; /* ntpq saveconfig output directory */ 60 61 extern void getconfig (int, char **); 62 extern void ctl_clr_stats (void); 63 extern int ctlclrtrap (sockaddr_u *, struct interface *, int); 64 extern u_short ctlpeerstatus (struct peer *); 65 extern int ctlsettrap (sockaddr_u *, struct interface *, int, int); 66 extern u_short ctlsysstatus (void); 67 extern void init_control (void); 68 extern void process_control (struct recvbuf *, int); 69 extern void report_event (int, struct peer *, const char *); 70 extern int mprintf_event (int, struct peer *, const char *, ...) 71 NTP_PRINTF(3, 4); 72 73 /* ntp_control.c */ 74 /* 75 * Structure for translation tables between internal system 76 * variable indices and text format. 77 */ 78 struct ctl_var { 79 u_short code; 80 u_short flags; 81 const char *text; 82 }; 83 /* 84 * Flag values 85 */ 86 #define CAN_READ 0x01 87 #define CAN_WRITE 0x02 88 89 #define DEF 0x20 90 #define PADDING 0x40 91 #define EOV 0x80 92 93 #define RO (CAN_READ) 94 #define WO (CAN_WRITE) 95 #define RW (CAN_READ|CAN_WRITE) 96 97 extern char * add_var (struct ctl_var **, u_long, u_short); 98 extern void free_varlist (struct ctl_var *); 99 extern void set_var (struct ctl_var **, const char *, u_long, u_short); 100 extern void set_sys_var (const char *, u_long, u_short); 101 extern const char * get_ext_sys_var(const char *tag); 102 103 /* ntp_io.c */ 104 typedef struct interface_info { 105 endpt * ep; 106 u_char action; 107 } interface_info_t; 108 109 typedef void (*interface_receiver_t) (void *, interface_info_t *); 110 111 extern void interface_enumerate (interface_receiver_t, void *); 112 extern endpt * getinterface (sockaddr_u *, u_int32); 113 extern endpt * select_peerinterface (struct peer *, sockaddr_u *, 114 endpt *); 115 extern endpt * findinterface (sockaddr_u *); 116 extern endpt * findbcastinter (sockaddr_u *); 117 extern void enable_broadcast (endpt *, sockaddr_u *); 118 extern void enable_multicast_if (endpt *, sockaddr_u *); 119 extern void interface_update (interface_receiver_t, void *); 120 #ifndef HAVE_IO_COMPLETION_PORT 121 extern void io_handler (void); 122 #endif 123 extern void init_io (void); 124 extern void io_open_sockets (void); 125 extern void io_clr_stats (void); 126 extern void io_setbclient (void); 127 extern void io_unsetbclient (void); 128 extern void io_multicast_add(sockaddr_u *); 129 extern void io_multicast_del(sockaddr_u *); 130 extern void sendpkt (sockaddr_u *, struct interface *, int, struct pkt *, int); 131 #ifdef DEBUG 132 extern void collect_timing (struct recvbuf *, const char *, int, l_fp *); 133 #endif 134 #ifdef HAVE_SIGNALED_IO 135 extern void wait_for_signal (void); 136 extern void unblock_io_and_alarm (void); 137 extern void block_io_and_alarm (void); 138 # define UNBLOCK_IO_AND_ALARM() unblock_io_and_alarm() 139 # define BLOCK_IO_AND_ALARM() block_io_and_alarm() 140 #else 141 # define UNBLOCK_IO_AND_ALARM() do {} while (0) 142 # define BLOCK_IO_AND_ALARM() do {} while (0) 143 #endif 144 #define latoa(pif) localaddrtoa(pif) 145 extern const char * localaddrtoa(endpt *); 146 147 /* ntp_loopfilter.c */ 148 extern void init_loopfilter(void); 149 extern int local_clock(struct peer *, double); 150 extern void adj_host_clock(void); 151 extern void loop_config(int, double); 152 extern void select_loop(int); 153 extern void huffpuff(void); 154 extern u_long sys_clocktime; 155 extern u_int sys_tai; 156 extern int freq_cnt; 157 158 /* ntp_monitor.c */ 159 #define MON_HASH_SIZE ((size_t)1U << mon_hash_bits) 160 #define MON_HASH_MASK (MON_HASH_SIZE - 1) 161 #define MON_HASH(addr) (sock_hash(addr) & MON_HASH_MASK) 162 extern void init_mon (void); 163 extern void mon_start (int); 164 extern void mon_stop (int); 165 extern u_short ntp_monitor (struct recvbuf *, u_short); 166 extern void mon_clearinterface(endpt *interface); 167 168 /* ntp_peer.c */ 169 extern void init_peer (void); 170 extern struct peer *findexistingpeer(sockaddr_u *, const char *, 171 struct peer *, int, u_char); 172 extern struct peer *findpeer (struct recvbuf *, int, int *); 173 extern struct peer *findpeerbyassoc(associd_t); 174 extern void set_peerdstadr (struct peer *, endpt *); 175 extern struct peer *newpeer (sockaddr_u *, const char *, 176 endpt *, u_char, u_char, 177 u_char, u_char, u_int, u_char, u_int32, 178 keyid_t, const char *); 179 extern void peer_all_reset (void); 180 extern void peer_clr_stats (void); 181 extern struct peer *peer_config(sockaddr_u *, const char *, 182 endpt *, u_char, u_char, 183 u_char, u_char, u_int, u_int32, 184 keyid_t, const char *); 185 extern void peer_reset (struct peer *); 186 extern void refresh_all_peerinterfaces(void); 187 extern void unpeer (struct peer *); 188 extern void clear_all (void); 189 extern int score_all (struct peer *); 190 extern struct peer *findmanycastpeer(struct recvbuf *); 191 extern void peer_cleanup (void); 192 193 /* ntp_crypto.c */ 194 #ifdef AUTOKEY 195 extern int crypto_recv (struct peer *, struct recvbuf *); 196 extern int crypto_xmit (struct peer *, struct pkt *, 197 struct recvbuf *, int, 198 struct exten *, keyid_t); 199 extern keyid_t session_key (sockaddr_u *, sockaddr_u *, keyid_t, 200 keyid_t, u_long); 201 extern int make_keylist (struct peer *, struct interface *); 202 extern void key_expire (struct peer *); 203 extern void crypto_update (void); 204 extern void crypto_update_taichange(void); 205 extern void crypto_config (int, char *); 206 extern void crypto_setup (void); 207 extern u_int crypto_ident (struct peer *); 208 extern struct exten *crypto_args (struct peer *, u_int, associd_t, char *); 209 extern int crypto_public (struct peer *, u_char *, u_int); 210 extern void value_free (struct value *); 211 extern char *iffpar_file; 212 extern EVP_PKEY *iffpar_pkey; 213 extern char *gqpar_file; 214 extern EVP_PKEY *gqpar_pkey; 215 extern char *mvpar_file; 216 extern EVP_PKEY *mvpar_pkey; 217 extern struct value tai_leap; 218 #endif /* AUTOKEY */ 219 220 /* ntp_proto.c */ 221 extern void transmit (struct peer *); 222 extern void receive (struct recvbuf *); 223 extern void peer_clear (struct peer *, const char *); 224 extern void process_packet (struct peer *, struct pkt *, u_int); 225 extern void clock_select (void); 226 extern void set_sys_leap (u_char); 227 228 extern u_long leapsec; /* seconds to next leap (proximity class) */ 229 extern int leapdif; /* TAI difference step at next leap second*/ 230 extern int sys_orphan; 231 extern double sys_mindisp; 232 extern double sys_maxdist; 233 234 extern char *sys_ident; /* identity scheme */ 235 extern void poll_update (struct peer *, u_char); 236 237 extern void clear (struct peer *); 238 extern void clock_filter (struct peer *, double, double, double); 239 extern void init_proto (void); 240 extern void set_sys_tick_precision(double); 241 extern void proto_config (int, u_long, double, sockaddr_u *); 242 extern void proto_clr_stats (void); 243 244 /* ntp_refclock.c */ 245 #ifdef REFCLOCK 246 extern int refclock_newpeer (struct peer *); 247 extern void refclock_unpeer (struct peer *); 248 extern void refclock_receive (struct peer *); 249 extern void refclock_transmit (struct peer *); 250 extern void init_refclock (void); 251 #endif /* REFCLOCK */ 252 253 /* ntp_request.c */ 254 extern void init_request (void); 255 extern void process_private (struct recvbuf *, int); 256 extern void reset_auth_stats(void); 257 258 /* ntp_restrict.c */ 259 extern void init_restrict (void); 260 extern u_short restrictions (sockaddr_u *); 261 extern void hack_restrict (int, sockaddr_u *, sockaddr_u *, 262 u_short, u_short, u_long); 263 extern void restrict_source (sockaddr_u *, int, u_long); 264 265 /* ntp_timer.c */ 266 extern void init_timer (void); 267 extern void reinit_timer (void); 268 extern void timer (void); 269 extern void timer_clr_stats (void); 270 extern void timer_interfacetimeout (u_long); 271 extern volatile int interface_interval; 272 extern u_long orphwait; /* orphan wait time */ 273 #ifdef AUTOKEY 274 extern char *sys_hostname; /* host name */ 275 extern char *sys_groupname; /* group name */ 276 extern char *group_name; /* group name */ 277 extern u_long sys_revoke; /* keys revoke timeout */ 278 extern u_long sys_automax; /* session key timeout */ 279 #endif /* AUTOKEY */ 280 281 /* ntp_util.c */ 282 extern void init_util (void); 283 extern void write_stats (void); 284 extern void stats_config (int, const char *); 285 extern void record_peer_stats (sockaddr_u *, int, double, double, double, double); 286 extern void record_proto_stats (char *); 287 extern void record_loop_stats (double, double, double, double, int); 288 extern void record_clock_stats (sockaddr_u *, const char *); 289 extern int mprintf_clock_stats(sockaddr_u *, const char *, ...) 290 NTP_PRINTF(2, 3); 291 extern void record_raw_stats (sockaddr_u *srcadr, sockaddr_u *dstadr, l_fp *t1, l_fp *t2, l_fp *t3, l_fp *t4, int leap, int version, int mode, int stratum, int ppoll, int precision, double root_delay, double root_dispersion, u_int32 refid); 292 extern void check_leap_file (int is_daily_check, u_int32 ntptime, const time_t * systime); 293 extern void record_crypto_stats (sockaddr_u *, const char *); 294 #ifdef DEBUG 295 extern void record_timing_stats (const char *); 296 #endif 297 extern char * fstostr(time_t); /* NTP timescale seconds */ 298 299 /* ntpd.c */ 300 extern void parse_cmdline_opts(int *, char ***); 301 /* 302 * Signals we catch for debugging. 303 */ 304 #define MOREDEBUGSIG SIGUSR1 305 #define LESSDEBUGSIG SIGUSR2 306 /* 307 * Signals which terminate us gracefully. 308 */ 309 #ifndef SYS_WINNT 310 # define SIGDIE1 SIGHUP 311 # define SIGDIE2 SIGINT 312 # define SIGDIE3 SIGQUIT 313 # define SIGDIE4 SIGTERM 314 #endif /* SYS_WINNT */ 315 316 317 /* 318 * Last half: ntpd variables 319 * ------------------------- 320 */ 321 322 /* ntp_config.c */ 323 extern char const * progname; 324 extern char *sys_phone[]; /* ACTS phone numbers */ 325 #if defined(HAVE_SCHED_SETSCHEDULER) 326 extern int config_priority_override; 327 extern int config_priority; 328 #endif 329 extern char *ntp_signd_socket; 330 extern struct config_tree_tag *cfg_tree_history; 331 332 #ifdef BC_LIST_FRAMEWORK_NOT_YET_USED 333 /* 334 * backwards compatibility flags 335 */ 336 typedef struct bc_entry_tag { 337 int token; 338 int enabled; 339 } bc_entry; 340 341 extern bc_entry bc_list[]; 342 #endif 343 344 /* ntp_control.c */ 345 extern int num_ctl_traps; 346 extern keyid_t ctl_auth_keyid; /* keyid used for authenticating write requests */ 347 348 /* 349 * Statistic counters to keep track of requests and responses. 350 */ 351 extern u_long ctltimereset; /* time stats reset */ 352 extern u_long numctlreq; /* number of requests we've received */ 353 extern u_long numctlbadpkts; /* number of bad control packets */ 354 extern u_long numctlresponses; /* number of resp packets sent with data */ 355 extern u_long numctlfrags; /* number of fragments sent */ 356 extern u_long numctlerrors; /* number of error responses sent */ 357 extern u_long numctltooshort; /* number of too short input packets */ 358 extern u_long numctlinputresp; /* number of responses on input */ 359 extern u_long numctlinputfrag; /* number of fragments on input */ 360 extern u_long numctlinputerr; /* number of input pkts with err bit set */ 361 extern u_long numctlbadoffset; /* number of input pkts with nonzero offset */ 362 extern u_long numctlbadversion; /* number of input pkts with unknown version */ 363 extern u_long numctldatatooshort; /* data too short for count */ 364 extern u_long numctlbadop; /* bad op code found in packet */ 365 extern u_long numasyncmsgs; /* number of async messages we've sent */ 366 367 /* 368 * Other statistics of possible interest 369 */ 370 extern volatile u_long packets_dropped; /* total number of packets dropped on reception */ 371 extern volatile u_long packets_ignored; /* packets received on wild card interface */ 372 extern volatile u_long packets_received;/* total number of packets received */ 373 extern u_long packets_sent; /* total number of packets sent */ 374 extern u_long packets_notsent; /* total number of packets which couldn't be sent */ 375 376 extern volatile u_long handler_calls; /* number of calls to interrupt handler */ 377 extern volatile u_long handler_pkts; /* number of pkts received by handler */ 378 extern u_long io_timereset; /* time counters were reset */ 379 380 /* ntp_io.c */ 381 extern int disable_dynamic_updates; 382 extern u_int sys_ifnum; /* next .ifnum to assign */ 383 extern endpt * any_interface; /* IPv4 wildcard */ 384 extern endpt * any6_interface; /* IPv6 wildcard */ 385 extern endpt * loopback_interface; /* IPv4 loopback for refclocks */ 386 extern endpt * ep_list; /* linked list */ 387 388 /* ntp_loopfilter.c */ 389 extern double drift_comp; /* clock frequency (s/s) */ 390 extern double clock_stability; /* clock stability (s/s) */ 391 extern double clock_max_back; /* max backward offset before step (s) */ 392 extern double clock_max_fwd; /* max forward offset before step (s) */ 393 extern double clock_panic; /* max offset before panic (s) */ 394 extern double clock_phi; /* dispersion rate (s/s) */ 395 extern double clock_minstep; /* step timeout (s) */ 396 extern double clock_codec; /* codec frequency */ 397 #ifdef KERNEL_PLL 398 extern int pll_status; /* status bits for kernel pll */ 399 #endif /* KERNEL_PLL */ 400 401 /* 402 * Clock state machine control flags 403 */ 404 extern int ntp_enable; /* clock discipline enabled */ 405 extern int pll_control; /* kernel support available */ 406 extern int kern_enable; /* kernel support enabled */ 407 extern int hardpps_enable; /* kernel PPS discipline enabled */ 408 extern int ext_enable; /* external clock enabled */ 409 extern int cal_enable; /* refclock calibrate enable */ 410 extern int allow_panic; /* allow panic correction (-g) */ 411 extern int enable_panic_check; /* Can we check allow_panic's state? */ 412 extern int force_step_once; /* always step time once at startup (-G) */ 413 extern int mode_ntpdate; /* exit on first clock set (-q) */ 414 extern int peer_ntpdate; /* count of ntpdate peers */ 415 416 /* 417 * Clock state machine variables 418 */ 419 extern u_char sys_poll; /* system poll interval (log2 s) */ 420 extern int state; /* clock discipline state */ 421 extern int tc_counter; /* poll-adjust counter */ 422 extern u_long last_time; /* time of last clock update (s) */ 423 extern double last_offset; /* last clock offset (s) */ 424 extern u_char allan_xpt; /* Allan intercept (log2 s) */ 425 extern double clock_jitter; /* clock jitter (s) */ 426 extern double sys_offset; /* system offset (s) */ 427 extern double sys_jitter; /* system jitter (s) */ 428 429 /* ntp_monitor.c */ 430 extern u_char mon_hash_bits; /* log2 size of hash table */ 431 extern mon_entry ** mon_hash; /* MRU hash table */ 432 extern mon_entry mon_mru_list; /* mru listhead */ 433 extern u_int mon_enabled; /* MON_OFF (0) or other MON_* */ 434 extern u_int mru_alloc; /* mru list + free list count */ 435 extern u_int mru_entries; /* mru list count */ 436 extern u_int mru_peakentries; /* highest mru_entries */ 437 extern u_int mru_initalloc; /* entries to preallocate */ 438 extern u_int mru_incalloc; /* allocation batch factor */ 439 extern u_int mru_mindepth; /* preempt above this */ 440 extern int mru_maxage; /* for entries older than */ 441 extern u_int mru_maxdepth; /* MRU size hard limit */ 442 extern int mon_age; /* preemption limit */ 443 444 /* ntp_peer.c */ 445 extern struct peer *peer_hash[NTP_HASH_SIZE]; /* peer hash table */ 446 extern int peer_hash_count[NTP_HASH_SIZE]; /* count of in each bucket */ 447 extern struct peer *assoc_hash[NTP_HASH_SIZE]; /* association ID hash table */ 448 extern int assoc_hash_count[NTP_HASH_SIZE];/* count of in each bucket */ 449 extern struct peer *peer_list; /* peer structures list */ 450 extern int peer_count; /* count in peer_list */ 451 extern int peer_free_count; /* count in peer_free */ 452 453 /* 454 * Miscellaneous statistic counters which may be queried. 455 */ 456 extern u_long peer_timereset; /* time stat counters were zeroed */ 457 extern u_long findpeer_calls; /* number of calls to findpeer */ 458 extern u_long assocpeer_calls; /* number of calls to findpeerbyassoc */ 459 extern u_long peer_allocations; /* number of allocations from the free list */ 460 extern u_long peer_demobilizations; /* number of structs freed to free list */ 461 extern int total_peer_structs; /* number of peer structs in circulation */ 462 extern int peer_associations; /* mobilized associations */ 463 extern int peer_preempt; /* preemptable associations */ 464 465 /* ntp_proto.c */ 466 /* 467 * System variables are declared here. See Section 3.2 of the 468 * specification. 469 */ 470 extern u_char sys_leap; /* system leap indicator */ 471 extern u_char sys_stratum; /* system stratum */ 472 extern s_char sys_precision; /* local clock precision */ 473 extern double sys_rootdelay; /* roundtrip delay to primary source */ 474 extern double sys_rootdisp; /* dispersion to primary source */ 475 extern u_int32 sys_refid; /* reference id */ 476 extern l_fp sys_reftime; /* last update time */ 477 extern struct peer *sys_peer; /* current peer */ 478 479 /* 480 * Nonspecified system state variables. 481 */ 482 extern int sys_bclient; /* we set our time to broadcasts */ 483 extern double sys_bdelay; /* broadcast client default delay */ 484 extern int sys_authenticate; /* requre authentication for config */ 485 extern l_fp sys_authdelay; /* authentication delay */ 486 extern u_long sys_epoch; /* last clock update time */ 487 extern keyid_t sys_private; /* private value for session seed */ 488 extern int sys_manycastserver; /* respond to manycast client pkts */ 489 extern int sys_minclock; /* minimum survivors */ 490 extern int sys_minsane; /* minimum candidates */ 491 extern int sys_floor; /* cluster stratum floor */ 492 extern int sys_ceiling; /* cluster stratum ceiling */ 493 extern u_char sys_ttl[MAX_TTL]; /* ttl mapping vector */ 494 extern int sys_ttlmax; /* max ttl mapping vector index */ 495 496 /* 497 * Statistics counters 498 */ 499 extern u_long sys_stattime; /* time since reset */ 500 extern u_long sys_received; /* packets received */ 501 extern u_long sys_processed; /* packets for this host */ 502 extern u_long sys_restricted; /* restricted packets */ 503 extern u_long sys_newversion; /* current version */ 504 extern u_long sys_oldversion; /* old version */ 505 extern u_long sys_restricted; /* access denied */ 506 extern u_long sys_badlength; /* bad length or format */ 507 extern u_long sys_badauth; /* bad authentication */ 508 extern u_long sys_declined; /* declined */ 509 extern u_long sys_limitrejected; /* rate exceeded */ 510 extern u_long sys_kodsent; /* KoD sent */ 511 512 /* ntp_request.c */ 513 extern keyid_t info_auth_keyid; /* keyid used to authenticate requests */ 514 extern u_long auth_timereset; 515 516 /* ntp_restrict.c */ 517 extern restrict_u * restrictlist4; /* IPv4 restriction list */ 518 extern restrict_u * restrictlist6; /* IPv6 restriction list */ 519 extern int ntp_minpkt; 520 extern u_char ntp_minpoll; 521 522 /* ntp_scanner.c */ 523 extern u_int32 conf_file_sum; /* Simple sum of characters */ 524 525 /* ntp_signd.c */ 526 #ifdef HAVE_NTP_SIGND 527 extern void send_via_ntp_signd(struct recvbuf *, int, keyid_t, int, 528 struct pkt *); 529 #endif 530 531 /* ntp_timer.c */ 532 extern volatile int alarm_flag; /* alarm flag */ 533 extern volatile u_long alarm_overflow; 534 extern u_long current_time; /* seconds since startup */ 535 extern u_long timer_timereset; 536 extern u_long timer_overflows; 537 extern u_long timer_xmtcalls; 538 extern int leap_sec_in_progress; 539 #ifdef LEAP_SMEAR 540 extern struct leap_smear_info leap_smear; 541 extern int leap_smear_intv; 542 #endif 543 #ifdef SYS_WINNT 544 HANDLE WaitableTimerHandle; 545 #endif 546 547 /* ntp_util.c */ 548 extern char statsdir[MAXFILENAME]; 549 extern int stats_control; /* write stats to fileset? */ 550 extern int stats_write_period; /* # of seconds between writes. */ 551 extern double stats_write_tolerance; 552 extern double wander_threshold; 553 554 /* ntpd.c */ 555 extern int nofork; /* no-fork flag */ 556 extern int initializing; /* initializing flag */ 557 #ifdef HAVE_DROPROOT 558 extern int droproot; /* flag: try to drop root privileges after startup */ 559 extern int root_dropped; /* root has been dropped */ 560 extern char *user; /* user to switch to */ 561 extern char *group; /* group to switch to */ 562 extern const char *chrootdir; /* directory to chroot() to */ 563 #endif 564 #ifdef HAVE_WORKING_FORK 565 extern int waitsync_fd_to_close; /* -w/--wait-sync */ 566 #endif 567 568 /* ntservice.c */ 569 #ifdef SYS_WINNT 570 extern int accept_wildcard_if_for_winnt; 571 #endif 572 573 /* refclock_conf.c */ 574 #ifdef REFCLOCK 575 /* refclock configuration table */ 576 extern struct refclock * const refclock_conf[]; 577 extern u_char num_refclock_conf; 578 #endif 579 580