ntp.h

网络时间协议NTP 源码 版本v4.2.0b 该源码用于linux平台下

	EVP_PKEY *ident_pkey;	/* identity key */
	tstamp_t fstamp;	/* identity filestamp */
	BIGNUM	*iffval;	/* IFF/GQ challenge */
	BIGNUM	*grpkey;	/* GQ group key */
	struct value cookval;	/* cookie values */
	struct value recval;	/* receive autokey values */
	struct exten *cmmd;	/* extension pointer */

	/*
	 * Variables used by authenticated server
	 */
	keyid_t	*keylist;	/* session key ID list */
	int	keynumber;	/* current key number */
	struct value encrypt;	/* send encrypt values */
	struct value sndval;	/* send autokey values */
	struct value tai_leap;	/* send leapsecond table */
#else /* OPENSSL */
#define clear_to_zero status
#endif /* OPENSSL */

	/*
	 * Ephemeral state variables
	 */
	u_char	status;		/* peer status */
	u_char	reach;		/* reachability register */
	u_long	epoch;		/* reference epoch */
	u_int	burst;		/* packets remaining in burst */
	u_int	filter_nextpt;	/* index into filter shift register */
	double	filter_delay[NTP_SHIFT]; /* delay shift register */
	double	filter_offset[NTP_SHIFT]; /* offset shift register */
	double	filter_disp[NTP_SHIFT]; /* dispersion shift register */
	u_long	filter_epoch[NTP_SHIFT]; /* epoch shift register */
	u_char	filter_order[NTP_SHIFT]; /* filter sort index */
	l_fp	org;		/* originate time stamp */
	l_fp	rec;		/* receive time stamp */
	l_fp	xmt;		/* transmit time stamp */
	double	offset;		/* peer clock offset */
	double	delay;		/* peer roundtrip delay */
	double	jitter;		/* peer jitter (squares) */
	double	disp;		/* peer dispersion */
	double	estbdelay;	/* clock offset to broadcast server */

	/*
	 * End of clear-to-zero area
	 */
	u_long	update;		/* receive epoch */
	u_int	unreach;	/* unreachable count */
#define end_clear_to_zero unreach
	u_long	outdate;	/* send time last packet */
	u_long	nextdate;	/* send time next packet */
	u_long	nextaction;	/* peer local activity timeout (refclocks) */
	void (*action) P((struct peer *)); /* action timeout function */

	/*
	 * Statistic counters
	 */
	u_long	timereset;	/* time stat counters were reset */
	u_long	timereceived;	/* last packet received time */
	u_long	timereachable;	/* last reachable/unreachable time */

	u_long	sent;		/* packets sent */
	u_long	received;	/* packets received */
	u_long	processed;	/* packets processed by the protocol */
	u_long	badauth;	/* packets cryptosum failed */
	u_long	bogusorg;	/* packets bogus origin */
	u_long	oldpkt;		/* packets duplicate packet */
	u_long	seldisptoolarge; /* packets dispersion too large */
	u_long	selbroken;	/* not used */
};

/*
 * Values for peer.leap, sys_leap
 */
#define	LEAP_NOWARNING	0x0	/* normal, no leap second warning */
#define	LEAP_ADDSECOND	0x1	/* last minute of day has 61 seconds */
#define	LEAP_DELSECOND	0x2	/* last minute of day has 59 seconds */
#define	LEAP_NOTINSYNC	0x3	/* overload, clock is free running */

/*
 * Values for peer mode and packet mode. Only the modes through
 * MODE_BROADCAST and MODE_BCLIENT appear in the transition
 * function. MODE_CONTROL and MODE_PRIVATE can appear in packets,
 * but those never survive to the transition function.
 * is a
 */
#define	MODE_UNSPEC	0	/* unspecified (old version) */
#define	MODE_ACTIVE	1	/* symmetric active mode */
#define	MODE_PASSIVE	2	/* symmetric passive mode */
#define	MODE_CLIENT	3	/* client mode */
#define	MODE_SERVER	4	/* server mode */
#define	MODE_BROADCAST	5	/* broadcast mode */
/*
 * These can appear in packets
 */
#define	MODE_CONTROL	6	/* control mode */
#define	MODE_PRIVATE	7	/* private mode */
/*
 * This is a madeup mode for broadcast client.
 */
#define	MODE_BCLIENT	6	/* broadcast client mode */

/*
 * Values for peer.stratum, sys_stratum
 */
#define	STRATUM_REFCLOCK ((u_char)0) /* default stratum */
/* A stratum of 0 in the packet is mapped to 16 internally */
#define	STRATUM_PKT_UNSPEC ((u_char)0) /* unspecified in packet */
#define	STRATUM_UNSPEC	((u_char)16) /* unspecified */

/*
 * Values for peer.flags
 */
#define	FLAG_CONFIG	0x0001	/* association was configured */
#define	FLAG_AUTHENABLE	0x0002	/* authentication required */
#define	FLAG_AUTHENTIC	0x0004	/* last message was authentic */
#define FLAG_SKEY	0x0008  /* autokey authentication */
#define FLAG_MCAST	0x0010  /* multicast client mode */
#define	FLAG_REFCLOCK	0x0020	/* this is actually a reference clock */
#define	FLAG_SYSPEER	0x0040	/* this is one of the selected peers */
#define FLAG_PREFER	0x0080	/* this is the preferred peer */
#define FLAG_BURST	0x0100	/* burst mode */
#define FLAG_IBURST	0x0200	/* initial burst mode */
#define FLAG_NOSELECT	0x0400	/* never select */
#define FLAG_ASSOC	0x0800	/* autokey request */
#define FLAG_FIXPOLL	0x1000	/* stick at minpoll */
#define FLAG_TRUE	0x2000	/* select truechimer */
#define	FLAG_PREEMPT	0x4000	/* preemptable association */

/*
 * Definitions for the clear() routine.  We use memset() to clear
 * the parts of the peer structure which go to zero.  These are
 * used to calculate the start address and length of the area.
 */
#define	CLEAR_TO_ZERO(p)	((char *)&((p)->clear_to_zero))
#define	END_CLEAR_TO_ZERO(p)	((char *)&((p)->end_clear_to_zero))
#define	LEN_CLEAR_TO_ZERO	(END_CLEAR_TO_ZERO((struct peer *)0) \
				    - CLEAR_TO_ZERO((struct peer *)0))
#define CRYPTO_TO_ZERO(p)	((char *)&((p)->clear_to_zero))
#define END_CRYPTO_TO_ZERO(p)	((char *)&((p)->end_clear_to_zero))
#define LEN_CRYPTO_TO_ZERO	(END_CRYPTO_TO_ZERO((struct peer *)0) \
				    - CRYPTO_TO_ZERO((struct peer *)0))

/*
 * Reference clock identifiers (for pps signal)
 */
#define PPSREFID (u_int32)"PPS "	/* used when pps controls stratum>1 */

/*
 * Reference clock types.  Added as necessary.
 */
#define	REFCLK_NONE		0	/* unknown or missing */
#define	REFCLK_LOCALCLOCK	1	/* external (e.g., lockclock) */
#define	REFCLK_GPS_TRAK		2	/* TRAK 8810 GPS Receiver */
#define	REFCLK_WWV_PST		3	/* PST/Traconex 1020 WWV/H */
#define	REFCLK_SPECTRACOM	4	/* Spectracom (generic) Receivers */
#define	REFCLK_TRUETIME		5	/* TrueTime (generic) Receivers */
#define REFCLK_IRIG_AUDIO	6	/* IRIG-B/W audio decoder */
#define	REFCLK_CHU_AUDIO	7	/* CHU audio demodulator/decoder */
#define REFCLK_PARSE		8	/* generic driver (usually DCF77,GPS,MSF) */
#define	REFCLK_GPS_MX4200	9	/* Magnavox MX4200 GPS */
#define REFCLK_GPS_AS2201	10	/* Austron 2201A GPS */
#define	REFCLK_GPS_ARBITER	11	/* Arbiter 1088A/B/ GPS */
#define REFCLK_IRIG_TPRO	12	/* KSI/Odetics TPRO-S IRIG */
#define REFCLK_ATOM_LEITCH	13	/* Leitch CSD 5300 Master Clock */
#define REFCLK_MSF_EES		14	/* EES M201 MSF Receiver */
#define	REFCLK_GPSTM_TRUE	15	/* OLD TrueTime GPS/TM-TMD Receiver */
#define REFCLK_IRIG_BANCOMM	16	/* Bancomm GPS/IRIG Interface */
#define REFCLK_GPS_DATUM	17	/* Datum Programmable Time System */
#define REFCLK_ACTS		18	/* Generic Auto Computer Time Service */
#define REFCLK_WWV_HEATH	19	/* Heath GC1000 WWV/WWVH Receiver */
#define REFCLK_GPS_NMEA		20	/* NMEA based GPS clock */
#define REFCLK_GPS_VME		21	/* TrueTime GPS-VME Interface */
#define REFCLK_ATOM_PPS		22	/* 1-PPS Clock Discipline */
#define REFCLK_PTB_ACTS		23	/* replaced by REFCLK_ACTS */
#define REFCLK_USNO		24	/* replaced by REFCLK_ACTS */
#define REFCLK_GPS_HP		26	/* HP 58503A Time/Frequency Receiver */
#define REFCLK_ARCRON_MSF	27	/* ARCRON MSF radio clock. */
#define REFCLK_SHM		28	/* clock attached thru shared memory */
#define REFCLK_PALISADE		29	/* Trimble Navigation Palisade GPS */
#define REFCLK_ONCORE		30	/* Motorola UT Oncore GPS */
#define REFCLK_GPS_JUPITER	31	/* Rockwell Jupiter GPS receiver */
#define REFCLK_CHRONOLOG	32	/* Chrono-log K WWVB receiver */
#define REFCLK_DUMBCLOCK	33	/* Dumb localtime clock */
#define REFCLK_ULINK		34	/* Ultralink M320 WWVB receiver */
#define REFCLK_PCF		35	/* Conrad parallel port radio clock */
#define REFCLK_WWV_AUDIO	36	/* WWV/H audio demodulator/decoder */
#define REFCLK_FG		37	/* Forum Graphic GPS */
#define REFCLK_HOPF_SERIAL	38	/* hopf DCF77/GPS serial receiver  */
#define REFCLK_HOPF_PCI		39	/* hopf DCF77/GPS PCI receiver  */
#define REFCLK_JJY		40	/* JJY receiver  */
#define	REFCLK_TT560		41	/* TrueTime 560 IRIG-B decoder */
#define REFCLK_ZYFER		42	/* Zyfer GPStarplus receiver  */
#define REFCLK_RIPENCC		43	/* RIPE NCC Trimble driver */
#define REFCLK_NEOCLOCK4X	44	/* NeoClock4X DCF77 or TDF receiver */
#define REFCLK_MAX		44	/* NeoClock4X DCF77 or TDF receiver */

 /*
 * Macro for sockaddr_storage structures operations
 */
#define SOCKCMP(sock1, sock2) \
	(((struct sockaddr_storage *)sock1)->ss_family \
	    == ((struct sockaddr_storage *)sock2)->ss_family ? \
 	((struct sockaddr_storage *)sock1)->ss_family == AF_INET ? \
 	memcmp(&((struct sockaddr_in *)sock1)->sin_addr, \
	    &((struct sockaddr_in *)sock2)->sin_addr, \
	    sizeof(struct in_addr)) == 0 : \
	memcmp(&((struct sockaddr_in6 *)sock1)->sin6_addr, \
	    &((struct sockaddr_in6 *)sock2)->sin6_addr, \
	    sizeof(struct in6_addr)) == 0 : \
	0)

#define SOCKNUL(sock1) \
	(((struct sockaddr_storage *)sock1)->ss_family == AF_INET ? \
 	(((struct sockaddr_in *)sock1)->sin_addr.s_addr == 0) : \
 	(IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)sock1)->sin6_addr)))

#define SOCKLEN(sock) \
	(((struct sockaddr_storage *)sock)->ss_family == AF_INET ? \
 	(sizeof(struct sockaddr_in)) : (sizeof(struct sockaddr_in6)))

#define ANYSOCK(sock) \
	memset(((struct sockaddr_storage *)sock), 0, \
	    sizeof(struct sockaddr_storage))

#define ANY_INTERFACE_CHOOSE(sock) \
	(((struct sockaddr_storage *)sock)->ss_family == AF_INET ? \
 	any_interface : any6_interface)

/*
 * We tell reference clocks from real peers by giving the reference
 * clocks an address of the form 127.127.t.u, where t is the type and
 * u is the unit number.  We define some of this here since we will need
 * some sanity checks to make sure this address isn't interpretted as
 * that of a normal peer.
 */
#define	REFCLOCK_ADDR	0x7f7f0000	/* 127.127.0.0 */
#define	REFCLOCK_MASK	0xffff0000	/* 255.255.0.0 */

#define	ISREFCLOCKADR(srcadr)	((SRCADR(srcadr) & REFCLOCK_MASK) \
					== REFCLOCK_ADDR)

/*
 * Macro for checking for invalid addresses.  This is really, really
 * gross, but is needed so no one configures a host on net 127 now that
 * we're encouraging it the the configuration file.
 */
#define	LOOPBACKADR	0x7f000001
#define	LOOPNETMASK	0xff000000

#define	ISBADADR(srcadr)	(((SRCADR(srcadr) & LOOPNETMASK) \
				    == (LOOPBACKADR & LOOPNETMASK)) \
				    && (SRCADR(srcadr) != LOOPBACKADR))

/*
 * Utilities for manipulating addresses and port numbers
 */
#define	NSRCADR(src)	(((struct sockaddr_in *)src)->sin_addr.s_addr) /* address in net byte order */
#define	NSRCPORT(src)	(((struct sockaddr_in *)src)->sin_port)	/* port in net byte order */
#define	SRCADR(src)	(ntohl(NSRCADR((src))))	/* address in host byte order */
#define	SRCPORT(src)	(ntohs(NSRCPORT((src))))	/* host port */

#define CAST_V4(src)	((struct sockaddr_in *)&(src))
#define CAST_V6(src)	((struct sockaddr_in6 *)&(src))
#define GET_INADDR(src)  (CAST_V4(src)->sin_addr.s_addr)
#define GET_INADDR6(src) (CAST_V6(src)->sin6_addr)

#define SET_HOSTMASK(addr, family)	\
	do { \
		memset((char *)(addr), 0, sizeof(struct sockaddr_storage)); \
		(addr)->ss_family = (family); \
		if ((family) == AF_INET) \
			GET_INADDR(*(addr)) = 0xffffffff; \
		else \
			memset(&GET_INADDR6(*(addr)), 0xff, \
			    sizeof(struct in6_addr)); \
	} while(0)

/*
 * NTP packet format.  The mac field is optional.  It isn't really
 * an l_fp either, but for now declaring it that way is convenient.
 * See Appendix A in the specification.
 *
 * Note that all u_fp and l_fp values arrive in network byte order
 * and must be converted (except the mac, which isn't, really).
 */
struct pkt {
	u_char	li_vn_mode;	/* leap indicator, version and mode */
	u_char	stratum;	/* peer stratum */
	u_char	ppoll;		/* peer poll interval */
	s_char	precision;	/* peer clock precision */
	u_fp	rootdelay;	/* distance to primary clock */
	u_fp	rootdispersion;	/* clock dispersion */
	u_int32	refid;		/* reference clock ID */
	l_fp	reftime;	/* time peer clock was last updated */
	l_fp	org;		/* originate time stamp */
	l_fp	rec;		/* receive time stamp */
	l_fp	xmt;		/* transmit time stamp */

#define	LEN_PKT_NOMAC	12 * sizeof(u_int32) /* min header length */
#define	LEN_PKT_MAC	LEN_PKT_NOMAC +  sizeof(u_int32)