xref: /freebsd/contrib/ntp/include/ntpd.h (revision f5f40dd63bc7acbb5312b26ac1ea1103c12352a6)

/*
 * ntpd.h - Prototypes and external variables for ntpd.
 *
 * Note the first half is primarily function prototypes, type
 * declarations, and preprocessor macros, with variables declared
 * primarily in the second half.
 *
 * Each half is further divided into sections for each source file.
 */

#include "ntp.h"
#include "ntp_stdlib.h"
#include "ntp_syslog.h"
#include "ntp_debug.h"
#include "ntp_syslog.h"
#include "ntp_select.h"
#include "ntp_malloc.h"
#include "ntp_refclock.h"
#include "ntp_intres.h"
#include "recvbuff.h"

/*
 * First half: ntpd types, functions, macros
 * -----------------------------------------
 */

/*
 * macro for debugging output - cut down on #ifdef pollution.
 *
 * DPRINTF() is for use by ntpd only, and compiles away to nothing
 * without DEBUG (configure --disable-debugging).
 *
 * TRACE() is similar for libntp and utilities, which retain full
 * debug capability even when compiled without DEBUG.
 *
 * The calling convention is not attractive:
 *     DPRINTF(debuglevel, (fmt, ...));
 *     DPRINTF(2, ("shows #ifdef DEBUG and if debug >= %d\n", 2));
 */
#ifdef DEBUG
# define DPRINTF(lvl, arg)				\
	do { 						\
		if (debug >= (lvl))			\
			mprintf arg;			\
	} while (0)
#else
# define DPRINTF(lvl, arg)	do {} while (0)
#endif

/* clear bitflag only on DEBUG builds */
#ifdef DEBUG
# define CLEAR_BIT_IF_DEBUG(bit, flags)			\
	do {						\
		(flags) &= ~(bit);			\
	} while (FALSE)
#else
# define CLEAR_BIT_IF_DEBUG(bit, flags)			\
	do {} while (FALSE)
#endif


/* nt_clockstuff.c */
#ifdef SYS_WINNT
extern	void	win_time_stepped(void);
#endif

/* ntp_config.c */
#define	TAI_1972	10	/* initial TAI offset (s) */
extern	char	*keysdir;	/* crypto keys and leaptable directory */
extern	char *	saveconfigdir;	/* ntpq saveconfig output directory */

extern	void	getconfig	(int, char **);
extern	void	ctl_clr_stats	(void);
extern	int	ctlclrtrap	(sockaddr_u *, endpt *, int);
extern	u_short ctlpeerstatus	(struct peer *);
extern	int	ctlsettrap	(sockaddr_u *, endpt *, int, int);
extern	u_short ctlsysstatus	(void);
extern	void	init_control	(void);
extern	void	process_control (struct recvbuf *, int);
extern	void	report_event	(int, struct peer *, const char *);
extern	int	mprintf_event	(int evcode, struct peer *p,
				 const char *fmt, ...) NTP_PRINTF(3, 4);

/* ntp_control.c */
/*
 * Structure for translation tables between internal system
 * variable indices and text format.
 */
struct ctl_var {
	u_short code;
	u_short flags;
	const char *text;
};
/*
 * Flag values
 */
#define	CAN_READ	0x01
#define	CAN_WRITE	0x02

#define DEF		0x20
#define	PADDING		0x40
#define	EOV		0x80

#define	RO	(CAN_READ)
#define	WO	(CAN_WRITE)
#define	RW	(CAN_READ|CAN_WRITE)

extern	char *	add_var (struct ctl_var **, u_long, u_short);
extern	void	free_varlist (struct ctl_var *);
extern	void	set_var (struct ctl_var **, const char *, u_long, u_short);
extern	void	set_sys_var (const char *, u_long, u_short);
extern	const char *	get_ext_sys_var(const char *tag);

/* ntp_io.c */
typedef struct interface_info {
	endpt *	ep;
	u_char	action;
} interface_info_t;

typedef void	(*interface_receiver_t)	(void *, interface_info_t *);

extern	void	interface_enumerate	(interface_receiver_t, void *);
extern	endpt *	getinterface		(sockaddr_u *, u_int32);
extern	endpt *	select_peerinterface	(struct peer *, sockaddr_u *,
					 endpt *);
extern	endpt *	findinterface		(sockaddr_u *);
extern	endpt *	findbcastinter		(sockaddr_u *);
extern	void	enable_broadcast	(endpt *, sockaddr_u *);
extern	void	enable_multicast_if	(endpt *, sockaddr_u *);
extern	void	interface_update	(interface_receiver_t, void *);
#ifndef HAVE_IO_COMPLETION_PORT
extern	void	io_handler		(void);
#else
extern	void WINAPI ip_interface_changed(ULONG_PTR ctx);
#endif
extern	void	init_io 	(void);
extern	void	io_open_sockets	(void);
extern	void	io_clr_stats	(void);
extern	void	io_setbclient	(void);
extern	void	io_unsetbclient	(void);
extern	void	io_multicast_add(sockaddr_u *);
extern	void	io_multicast_del(sockaddr_u *);
extern	void	sendpkt		(sockaddr_u *dest, endpt * ep, int ttl,
				 struct pkt *pkt, int len);
extern	isc_boolean_t	is_linklocal(sockaddr_u *psau);
#ifdef DEBUG_TIMING
extern	void	collect_timing  (struct recvbuf *, const char *, int, l_fp *);
#endif
#ifdef HAVE_SIGNALED_IO
extern	void	wait_for_signal		(void);
extern	void	unblock_io_and_alarm	(void);
extern	void	block_io_and_alarm	(void);
# define	UNBLOCK_IO_AND_ALARM()	unblock_io_and_alarm()
# define	BLOCK_IO_AND_ALARM()	block_io_and_alarm()
#else
# define	UNBLOCK_IO_AND_ALARM()	do {} while (0)
# define	BLOCK_IO_AND_ALARM()	do {} while (0)
#endif
#define		eptoa(pif)	localaddrtoa(pif)
#define		latoa(pif)	eptoa(pif)
extern const char * localaddrtoa(endpt *);
#ifdef DEBUG
extern const char * iflags_str(u_int32 iflags);
#endif


/* ntp_loopfilter.c */
extern	void	init_loopfilter(void);
extern	int 	local_clock(struct peer *, double);
extern	void	adj_host_clock(void);
extern	void	loop_config(int, double);
extern	void	select_loop(int);
extern	void	huffpuff(void);
extern	u_long	sys_clocktime;
extern	u_int	sys_tai;
extern 	int	freq_cnt;

/* ntp_monitor.c */
#define MON_HASH_SIZE		((size_t)1U << mon_hash_bits)
#define MON_HASH_MASK		(MON_HASH_SIZE - 1)
#define	MON_HASH(addr)		(sock_hash(addr) & MON_HASH_MASK)
extern	void	init_mon	(void);
extern	void	mon_start	(int);
extern	void	mon_stop	(int);
extern	u_short	ntp_monitor	(struct recvbuf *, u_short);
extern	void	mon_clearinterface(endpt *interface);

/* ntp_peer.c */
extern	void	init_peer	(void);
extern	struct peer *findexistingpeer(sockaddr_u *, const char *,
				      struct peer *, int, u_char, int *);
extern	struct peer *findpeer	(struct recvbuf *, int, int *);
extern	struct peer *findpeerbyassoc(associd_t);
extern  void	set_peerdstadr	(struct peer *, endpt *);
extern	struct peer *newpeer	(sockaddr_u *, const char *, endpt *,
				 int, u_char, u_char, u_char, u_char,
				 u_int, u_char, u_int32,
				 keyid_t, const char *);
extern	void	peer_all_reset	(void);
extern	void	peer_clr_stats	(void);
extern	struct peer *peer_config(sockaddr_u *, const char *, endpt *,
				 int, u_char, u_char, u_char, u_char,
				 u_int, u_int32,
				 keyid_t, const char *);
extern	void	peer_reset	(struct peer *);
extern	void	refresh_all_peerinterfaces(void);
extern	void	unpeer		(struct peer *);
extern	void	clear_all	(void);
extern	int	score_all	(struct peer *);
extern	struct peer *findmanycastpeer(struct recvbuf *);
extern	void	peer_cleanup	(void);

/* ntp_crypto.c */
#ifdef AUTOKEY
extern	int	crypto_recv	(struct peer *, struct recvbuf *);
extern	int	crypto_xmit	(struct peer *, struct pkt *,
				    struct recvbuf *, int,
				    struct exten *, keyid_t);
extern	keyid_t	session_key	(sockaddr_u *, sockaddr_u *, keyid_t,
				    keyid_t, u_long);
extern	int	make_keylist	(struct peer *, endpt *);
extern	void	key_expire	(struct peer *);
extern	void	crypto_update	(void);
extern	void	crypto_update_taichange(void);
extern	void	crypto_config	(int, char *);
extern	void	crypto_setup	(void);
extern	u_int	crypto_ident	(struct peer *);
extern	struct exten *crypto_args (struct peer *, u_int, associd_t, char *);
extern	int	crypto_public	(struct peer *, u_char *, u_int);
extern	void	value_free	(struct value *);
extern	char	*iffpar_file;
extern	EVP_PKEY *iffpar_pkey;
extern	char	*gqpar_file;
extern	EVP_PKEY *gqpar_pkey;
extern	char	*mvpar_file;
extern	EVP_PKEY *mvpar_pkey;
extern struct value tai_leap;
#endif	/* AUTOKEY */

/* ntp_proto.c */
extern	void	transmit	(struct peer *);
extern	void	receive 	(struct recvbuf *);
extern	void	peer_clear	(struct peer *, const char *);
extern	void 	process_packet	(struct peer *, struct pkt *, u_int);
extern	void	clock_select	(void);
extern	void	set_sys_leap	(u_char);

extern	u_long	leapsec;	/* seconds to next leap (proximity class) */
extern  int	leapdif;	/* TAI difference step at next leap second */
extern	int	sys_orphan;
extern	double	sys_mindisp;
extern	double	sys_maxdist;

extern	char	*sys_ident;	/* identity scheme */
extern	void	poll_update	(struct peer *, u_char, u_char);

extern	void	clear		(struct peer *);
extern	void	clock_filter	(struct peer *, double, double, double);
extern	void	init_proto	(void);
extern	void	set_sys_tick_precision(double);
extern	void	proto_config	(int, u_long, double, sockaddr_u *);
extern	void	proto_clr_stats (void);

/* ntp_refclock.c */
#ifdef	REFCLOCK
extern	int	refclock_newpeer (struct peer *);
extern	void	refclock_unpeer (struct peer *);
extern	void	refclock_receive (struct peer *);
extern	void	refclock_transmit (struct peer *);
extern	void	init_refclock	(void);
#endif	/* REFCLOCK */

/* ntp_request.c */
extern	void	init_request	(void);
extern	void	process_private (struct recvbuf *, int);
extern	void	reset_auth_stats(void);

/* ntp_restrict.c */
extern	void	init_restrict	(void);
extern	void	restrictions	(sockaddr_u *, r4addr *);
extern	int/*BOOL*/hack_restrict(restrict_op op, sockaddr_u *resaddr,
				 sockaddr_u *resmask, short ippeerlimit,
				 u_short mflags, u_short rflags,
				 u_int32 expire);
extern	void	restrict_source	(sockaddr_u *addr, int/*BOOL*/ remove,
				 u_int32 lifetime);
#ifdef DEBUG
extern	void	dump_restricts	(void);
extern	const char *resop_str	(restrict_op op);
extern	const char *rflags_str	(u_short rflags);
extern	const char *mflags_str	(u_short mflags);
#endif


/* ntp_timer.c */
extern	void	init_timer	(void);
extern	void	reinit_timer	(void);
extern	void	timer		(void);
extern	void	timer_clr_stats (void);
extern	int	endpt_scan_period;	/* -U option default 301s */
extern	u_long	endpt_scan_timer;	/* next scan current_time */
extern	u_long	orphwait;		/* orphan wait time */
#ifdef AUTOKEY
extern	char	*sys_hostname;	/* host name */
extern	char	*sys_groupname;	/* group name */
extern	char	*group_name;	/* group name */
extern	u_char	sys_revoke;	/* keys revoke timeout */
extern	u_char	sys_automax;	/* session key timeout */
#endif	/* AUTOKEY */

/* ntp_util.c */
extern	void	init_util	(void);
extern	void	write_stats	(void);
extern	void	stats_config	(int, const char *, int optflag);
extern	void	record_peer_stats (sockaddr_u *, int, double, double, double, double);
extern	void	record_proto_stats (char *);
extern	void	record_loop_stats (double, double, double, double, int);
extern	void	record_clock_stats (sockaddr_u *, const char *);
extern	int	mprintf_clock_stats(sockaddr_u *, const char *, ...)
					NTP_PRINTF(2, 3);
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, int len, u_char *extra);
extern	void	check_leap_file	(int is_daily_check, u_int32 ntptime, const time_t * systime);
extern	void	record_crypto_stats (sockaddr_u *, const char *);
#ifdef DEBUG
extern	void	record_timing_stats (const char *);
extern	void	append_flagstr(char *flagstr, size_t sz, const char *text);
#endif
extern	char *	fstostr(time_t);	/* NTP timescale seconds */

/* ntpd.c */
extern	void	parse_cmdline_opts(int *, char ***);

/* ntservice.c */
#ifndef SYS_WINNT
# define	ntservice_isup()	do {} while (FALSE)
#endif

/*
 * Signals we catch for debugging.
 */
#define MOREDEBUGSIG	SIGUSR1
#define LESSDEBUGSIG	SIGUSR2
/*
 * Signals which terminate us gracefully.
 */
#ifndef SYS_WINNT
# define SIGDIE1	SIGHUP
# define SIGDIE2	SIGINT
# define SIGDIE3	SIGQUIT
# define SIGDIE4	SIGTERM
#endif /* SYS_WINNT */


/*
 * Last half: ntpd variables
 * -------------------------
 */

/* ntp_config.c */
extern char const *	progname;
extern int saved_argc;
extern char **saved_argv;
extern char	*sys_phone[];		/* ACTS phone numbers */
#if defined(HAVE_SCHED_SETSCHEDULER)
extern int	config_priority_override;
extern int	config_priority;
#endif
extern char *ntp_signd_socket;
extern struct config_tree_tag *cfg_tree_history;

#ifdef BC_LIST_FRAMEWORK_NOT_YET_USED
/*
 * backwards compatibility flags
 */
typedef struct bc_entry_tag {
	int	token;
	int	enabled;
} bc_entry;

extern bc_entry bc_list[];
#endif

/* ntp_control.c */
extern int	num_ctl_traps;
extern keyid_t	ctl_auth_keyid;		/* keyid used for authenticating write requests */

/*
 * Statistic counters to keep track of requests and responses.
 */
extern u_long	ctltimereset;		/* time stats reset */
extern u_long	numctlreq;		/* number of requests we've received */
extern u_long	numctlbadpkts;		/* number of bad control packets */
extern u_long	numctlresponses; 	/* number of resp packets sent with data */
extern u_long	numctlfrags; 		/* number of fragments sent */
extern u_long	numctlerrors;		/* number of error responses sent */
extern u_long	numctltooshort;		/* number of too short input packets */
extern u_long	numctlinputresp; 	/* number of responses on input */
extern u_long	numctlinputfrag; 	/* number of fragments on input */
extern u_long	numctlinputerr;		/* number of input pkts with err bit set */
extern u_long	numctlbadoffset; 	/* number of input pkts with nonzero offset */
extern u_long	numctlbadversion;	/* number of input pkts with unknown version */
extern u_long	numctldatatooshort;	/* data too short for count */
extern u_long	numctlbadop; 		/* bad op code found in packet */
extern u_long	numasyncmsgs;		/* number of async messages we've sent */

/*
 * Other statistics of possible interest
 */
extern volatile u_long packets_dropped;	/* total number of packets dropped on reception */
extern volatile u_long packets_ignored;	/* packets received on wild card interface */
extern volatile u_long packets_received;/* total number of packets received */
extern u_long	packets_sent;		/* total number of packets sent */
extern u_long	packets_notsent; 	/* total number of packets which couldn't be sent */

extern volatile u_long handler_calls;	/* number of calls to interrupt handler */
extern volatile u_long handler_pkts;	/* number of pkts received by handler */
extern u_long	io_timereset;		/* time counters were reset */

/* ntp_io.c */
extern int	no_periodic_scan;	/* no periodic net addr scans */
extern int	scan_addrs_once;	/* no net addr rescans */
extern int	nonlocal_v4_addr_up;	/* should we try IPv4 pool? */
extern int	nonlocal_v6_addr_up;	/* should we try IPv6 pool? */
extern u_int	sys_ifnum;		/* next .ifnum to assign */
extern endpt *	any_interface;		/* IPv4 wildcard */
extern endpt *	any6_interface;		/* IPv6 wildcard */
extern endpt *	loopback_interface;	/* IPv4 loopback for refclocks */
extern endpt *	ep_list;		/* linked list */

/* ntp_loopfilter.c */
extern double	drift_comp;		/* clock frequency (s/s) */
extern double	clock_stability;	/* clock stability (s/s) */
extern double	clock_max_back;		/* max backward offset before step (s) */
extern double	clock_max_fwd;		/* max forward offset before step (s) */
extern double	clock_panic;		/* max offset before panic (s) */
extern double	clock_phi;		/* dispersion rate (s/s) */
extern double	clock_minstep;		/* step timeout (s) */
extern double	clock_codec;		/* codec frequency */
#ifdef KERNEL_PLL
extern int	pll_status;		/* status bits for kernel pll */
#endif /* KERNEL_PLL */

/*
 * Clock state machine control flags
 */
extern int	ntp_enable;		/* clock discipline enabled */
extern int	pll_control;		/* kernel support available */
extern int	kern_enable;		/* kernel support enabled */
extern int	hardpps_enable;		/* kernel PPS discipline enabled */
extern int	ext_enable;		/* external clock enabled */
extern int	cal_enable;		/* refclock calibrate enable */
extern int	allow_panic;		/* allow panic correction (-g) */
extern int	enable_panic_check;	/* Can we check allow_panic's state? */
extern int	force_step_once;	/* always step time once at startup (-G) */
extern int	mode_ntpdate;		/* exit on first clock set (-q) */
extern int	peer_ntpdate;		/* count of ntpdate peers */

/*
 * Clock state machine variables
 */
extern u_char	sys_poll;		/* system poll interval (log2 s) */
extern int	state;			/* clock discipline state */
extern int	tc_counter;		/* poll-adjust counter */
extern u_long	last_time;		/* time of last clock update (s) */
extern double	last_offset;		/* last clock offset (s) */
extern u_char	allan_xpt;		/* Allan intercept (log2 s) */
extern double	clock_jitter;		/* clock jitter (s) */
extern double	sys_offset;		/* system offset (s) */
extern double	sys_jitter;		/* system jitter (s) */

/* ntp_monitor.c */
extern u_char	mon_hash_bits;		/* log2 size of hash table */
extern mon_entry ** mon_hash;		/* MRU hash table */
extern mon_entry mon_mru_list;		/* mru listhead */
extern u_int	mon_enabled;		/* MON_OFF (0) or other MON_* */
extern u_int	mru_alloc;		/* mru list + free list count */
extern u_int	mru_entries;		/* mru list count */
extern u_int	mru_peakentries;	/* highest mru_entries */
extern u_int	mru_initalloc;		/* entries to preallocate */
extern u_int	mru_incalloc;		/* allocation batch factor */
extern u_int	mru_mindepth;		/* preempt above this */
extern int	mru_maxage;		/* for entries older than */
extern u_int	mru_maxdepth; 		/* MRU size hard limit */
extern int	mon_age;		/* preemption limit */

/* ntp_peer.c */
extern struct peer *peer_hash[NTP_HASH_SIZE];	/* peer hash table */
extern int	peer_hash_count[NTP_HASH_SIZE];	/* count of in each bucket */
extern struct peer *assoc_hash[NTP_HASH_SIZE];	/* association ID hash table */
extern int	assoc_hash_count[NTP_HASH_SIZE];/* count of in each bucket */
extern struct peer *peer_list;		/* peer structures list */
extern int	peer_count;		/* count in peer_list */
extern int	peer_free_count;	/* count in peer_free */

/*
 * Miscellaneous statistic counters which may be queried.
 */
extern u_long	peer_timereset;		/* time stat counters were zeroed */
extern u_long	findpeer_calls;		/* number of calls to findpeer */
extern u_long	assocpeer_calls;	/* number of calls to findpeerbyassoc */
extern u_long	peer_allocations;	/* number of allocations from the free list */
extern u_long	peer_demobilizations;	/* number of structs freed to free list */
extern int	total_peer_structs;	/* number of peer structs in circulation */
extern int	peer_associations;	/* mobilized associations */
extern int	peer_preempt;		/* preemptable associations */

/* ntp_proto.c */
/*
 * System variables are declared here.	See Section 3.2 of the
 * specification.
 */
extern u_char	sys_leap;		/* system leap indicator */
extern u_char	sys_stratum;		/* system stratum */
extern s_char	sys_precision;		/* local clock precision */
extern double	sys_rootdelay;		/* roundtrip delay to primary source */
extern double	sys_rootdisp;		/* dispersion to primary source */
extern u_int32	sys_refid;		/* reference id */
extern l_fp	sys_reftime;		/* last update time */
extern struct peer *sys_peer;		/* current peer */

/*
 * Nonspecified system state variables.
 */
extern int	sys_bclient;		/* we set our time to broadcasts */
extern int	sys_mclient;		/* we set our time to manycasts */
extern double	sys_bdelay; 		/* broadcast client default delay */
extern int	sys_authenticate;	/* requre authentication for config */
extern l_fp	sys_authdelay;		/* authentication delay */
extern u_char	sys_bcpollbstep;	/* broadcast poll backstep gate */
extern u_long 	sys_epoch;		/* last clock update time */
extern keyid_t	sys_private;		/* private value for session seed */
extern int	sys_manycastserver;	/* respond to manycast client pkts */
extern int	sys_maxclock;		/* maximum survivors */
extern int	sys_minclock;		/* minimum survivors */
extern int	sys_minsane;		/* minimum candidates */
extern int	sys_floor;		/* cluster stratum floor */
extern int	sys_ceiling;		/* cluster stratum ceiling */
extern u_char	sys_ttl[MAX_TTL];	/* ttl mapping vector */
extern u_int	sys_ttlmax;		/* max ttl mapping vector index */

/*
 * Statistics counters
 */
extern u_long	sys_badauth;		/* bad authentication */
extern u_long	sys_badlength;		/* bad length or format */
extern u_long	sys_declined;		/* declined */
extern u_long	sys_kodsent;		/* KoD sent */
extern u_long	sys_lamport;		/* Lamport violation */
extern u_long	sys_limitrejected;	/* rate exceeded */
extern u_long	sys_newversion;		/* current version  */
extern u_long	sys_oldversion;		/* old version */
extern u_long	sys_processed;		/* packets for this host */
extern u_long	sys_received;		/* packets received */
extern u_long	sys_restricted;		/* access denied */
extern u_long	sys_stattime;		/* time since reset */
extern u_long	sys_tsrounding;		/* timestamp rounding errors */

/* ntp_request.c */
extern keyid_t	info_auth_keyid;	/* keyid used to authenticate requests */
extern u_long	auth_timereset;

/* ntp_restrict.c */
extern restrict_u *	restrictlist4;	/* IPv4 restriction list */
extern restrict_u *	restrictlist6;	/* IPv6 restriction list */
extern int		ntp_minpkt;
extern u_char		ntp_minpoll;

/* ntp_scanner.c */
extern u_int32		conf_file_sum;	/* Simple sum of characters */

/* ntp_signd.c */
#ifdef HAVE_NTP_SIGND
extern void send_via_ntp_signd(struct recvbuf *, int, keyid_t, int,
			       struct pkt *);
#endif

/* ntp_timer.c */
extern volatile int alarm_flag;		/* alarm flag */
extern volatile u_long alarm_overflow;
extern u_long	current_time;		/* seconds since startup */
extern u_long	timer_timereset;
extern u_long	timer_overflows;
extern u_long	timer_xmtcalls;
extern int	leap_sec_in_progress;
#ifdef LEAP_SMEAR
extern struct leap_smear_info leap_smear;
extern int	leap_smear_intv;
#endif
#ifdef SYS_WINNT
HANDLE WaitableTimerHandle;
#endif

/* ntp_util.c */
extern	char	statsdir[MAXFILENAME];
extern	int	stats_control;		/* write stats to fileset? */
extern	int	stats_write_period;	/* # of seconds between writes. */
extern	double	stats_write_tolerance;
extern	double	wander_threshold;

/* ntpd.c */
extern	int	nofork;		/* no-fork flag */
extern	int	initializing;	/* initializing flag */
#ifdef HAVE_DROPROOT
extern	int	droproot;	/* flag: try to drop root privileges after startup */
extern	int	root_dropped;	/* root has been dropped */
extern char *user;		/* user to switch to */
extern char *group;		/* group to switch to */
extern const char *chrootdir;	/* directory to chroot() to */
#endif
#ifdef HAVE_WORKING_FORK
extern	int	daemon_pipe[2];	/* startup monitoring */
#endif

/* ntservice.c */
#ifdef SYS_WINNT
extern int accept_wildcard_if_for_winnt;
#endif

/* refclock_conf.c */
#ifdef REFCLOCK
/* refclock configuration table */
extern struct refclock * const refclock_conf[];
extern u_char	num_refclock_conf;
#endif