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/* $OpenBSD: ntp.h,v 1.14 2020/01/30 15:55:41 otto Exp $ */
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/*
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* Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
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* Copyright (c) 2004 Alexander Guy <alexander.guy@andern.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _NTP_H_
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#define _NTP_H_
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/* Style borrowed from NTP ref/tcpdump and updated for SNTPv4 (RFC2030). */
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/*
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* RFC Section 3
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Integer Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Fraction Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Integer Part | Fraction Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct l_fixedpt {
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u_int32_t int_partl;
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u_int32_t fractionl;
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};
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struct s_fixedpt {
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u_int16_t int_parts;
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u_int16_t fractions;
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};
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/* RFC Section 4
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |LI | VN | Mode| Stratum | Poll | Precision |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Synchronizing Distance |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Synchronizing Dispersion |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reference Clock Identifier |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Reference Timestamp (64 bits) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Originate Timestamp (64 bits) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Receive Timestamp (64 bits) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Transmit Timestamp (64 bits) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Key Identifier (optional) (32) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | |
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* | Message Digest (optional) (128) |
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* | |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*/
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#define NTP_DIGESTSIZE 16
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#define NTP_MSGSIZE_NOAUTH 48
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#define NTP_MSGSIZE (NTP_MSGSIZE_NOAUTH + 4 + NTP_DIGESTSIZE)
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struct ntp_msg {
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u_int8_t status; /* status of local clock and leap info */
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u_int8_t stratum; /* Stratum level */
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u_int8_t ppoll; /* poll value */
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int8_t precision;
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struct s_fixedpt rootdelay;
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struct s_fixedpt dispersion;
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u_int32_t refid;
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struct l_fixedpt reftime;
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struct l_fixedpt orgtime;
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struct l_fixedpt rectime;
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struct l_fixedpt xmttime;
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} __packed;
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struct ntp_query {
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int fd;
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struct ntp_msg msg;
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double xmttime;
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};
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/*
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* Leap Second Codes (high order two bits)
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*/
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#define LI_NOWARNING (0 << 6) /* no warning */
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#define LI_PLUSSEC (1 << 6) /* add a second (61 seconds) */
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#define LI_MINUSSEC (2 << 6) /* minus a second (59 seconds) */
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#define LI_ALARM (3 << 6) /* alarm condition */
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/*
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* Status Masks
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*/
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#define MODEMASK (7 << 0)
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#define VERSIONMASK (7 << 3)
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#define LIMASK (3 << 6)
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/*
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* Mode values
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*/
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#define MODE_RES0 0 /* reserved */
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#define MODE_SYM_ACT 1 /* symmetric active */
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#define MODE_SYM_PAS 2 /* symmetric passive */
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#define MODE_CLIENT 3 /* client */
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#define MODE_SERVER 4 /* server */
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#define MODE_BROADCAST 5 /* broadcast */
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#define MODE_RES1 6 /* reserved for NTP control message */
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#define MODE_RES2 7 /* reserved for private use */
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#define JAN_1970 2208988800UL /* 1970 - 1900 in seconds */
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/*
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* The era we're in if we have no reason to assume otherwise.
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* If lfp_to_d() sees an offset <= INT32_MAX the era is is assumed to be
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* NTP_ERA + 1.
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* Once the actual year is well into era 1, (after 2036) define NTP_ERA to 1
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* and adapt (remove) the test in lfp_to_d().
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* Once more than half of era 1 has elapsed (after 2104), re-inroduce the test
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* to move to era 2 if offset <= INT32_MAX, repeat for each half era.
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*/
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#define NTP_ERA 0
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#define SECS_IN_ERA (UINT32_MAX + 1ULL)
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#define NTP_VERSION 4
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#define NTP_MAXSTRATUM 15
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#endif /* _NTP_H_ */
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