208 lines
9.4 KiB
C
208 lines
9.4 KiB
C
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/****************************************************************************
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* apps/netutils/ntpclient/ntpv3.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __APPS_NETUTILS_NTPCLIENT_NTPV3_H
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#define __APPS_NETUTILS_NTPCLIENT_NTPV3_H 1
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/****************************************************************************
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* Included Files
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****************************************************************************/
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The NTP version is described in RFC 1305 (NTP version 3), Appendix A:
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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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* | Root Delay |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Root Dispersion |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reference Identifier |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Reference Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Originate Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Receive Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Transmit Timestamp (64) |
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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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#define NTP_DATAGRAM_MINSIZE (12 * sizeof(uint32_t))
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#define NTP_DATAGRAM_MAXSIZE (17 * sizeof(uint32_t))
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/* Leap Indicator (LI): 2-bit code warning of impending leap-second to be
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* inserted at the end of the last day of the current month. Bits are coded
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* as follows:
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*
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* 00 no warning
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* 01 last minute has 61 seconds
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* 10 last minute has 59 seconds
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* 11 alarm condition (clock not synchronized)
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*
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* Version Number (VN): This is a three-bit integer indicating the NTP
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* version number. In this case, three (3).
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*
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* Mode: This is a three-bit integer indicating the mode, with values
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* defined as follows:
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*
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* 0 reserved
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* 1 symmetric active
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* 2 symmetric passive
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* 3 client
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* 4 server
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* 5 broadcast
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* 6 reserved for NTP control message (see Appendix B)
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* 7 reserved for private use
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*
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* Stratum: This is a eight-bit integer indicating the stratum level of the
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* local clock, with values defined as follows:
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*
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* 0 unspecified
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* 1 primary reference (e.g., radio clock)
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* 2-255 secondary reference (via NTP)
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*
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* Poll Interval: This is an eight-bit signed integer indicating the maximum
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* interval between successive messages, in seconds to the nearest power of
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* two.
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*
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* Precision: This is an eight-bit signed integer indicating the precision
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* of the local clock, in seconds to the nearest power of two.
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*
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* Root Delay: This is a 32-bit signed fixed-point number indicating the
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* total roundtrip delay to the primary reference source, in seconds with
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* fraction point between bits 15 and 16. Note that this variable can take
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* on both positive and negative values, depending on clock precision and
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* skew.
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*
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* Root Dispersion: This is a 32-bit signed fixed-point number indicating
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* the maximum error relative to the primary reference source, in seconds
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* with fraction point between bits 15 and 16. Only positive values greater
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* than zero are possible.
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*
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* Reference Clock Identifier: This is a 32-bit code identifying the
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* particular reference clock. In the case of stratum 0 (unspecified) or
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* stratum 1 (primary reference), this is a four-octet, left-justified,
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* zero-padded ASCII string.
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*
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* While not enumerated as part of the NTP specification, the following are
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* suggested ASCII identifiers:
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*
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* Stratum Code Meaning
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* 0 DCN DCN routing protocol
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* 0 NIST NIST public modem
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* 0 TSP TSP time protocol
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* 0 DTS Digital Time Service
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* 1 ATOM Atomic clock (calibrated)
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* 1 VLF VLF radio (OMEGA, etc.)
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* 1 callsign Generic radio
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* 1 LORC LORAN-C radionavigation
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* 1 GOES GOES UHF environment satellite
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* 1 GPS GPS UHF satellite positioning
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*
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* In the case of stratum 2 and greater (secondary reference) this is the
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* four-octet Internet address of the primary reference host.
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*
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* Reference Timestamp: This is the local time at which the local clock was
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* last set or corrected, in 64-bit timestamp format.
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*
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* Originate Timestamp: This is the local time at which the request departed
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* the client host for the service host, in 64-bit timestamp format.
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*
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* Receive Timestamp: This is the local time at which the request arrived at
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* the service host, in 64-bit timestamp format.
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*
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* Transmit Timestamp: This is the local time at which the reply departed
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* the service host for the client host, in 64-bit timestamp format.
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*
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* Authenticator (optional): When the NTP authentication mechanism is
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* implemented, this contains the authenticator information defined in
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* Appendix C.
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*/
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#define MKLVM(l,v,m) ((uint8_t)(l) << 6 | (uint8_t)(v) << 3 | (uint8_t)(m))
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#define GETLI(lvm) ((uint8_t)(lvm) >> 6)
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#define GETVN(lvm) ((uint8_t)(lvm) >> 3) & 7)
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#define GETMODE(lvm) ((uint8_t)(lvm) & 7)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct ntp_datagram_s
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{
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uint8_t lvm; /* LI | VN | Mode */
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uint8_t stratum; /* Stratum */
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uint8_t poll; /* Poll interval */
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uint8_t precision; /* Precision */
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uint8_t rootdelay[4]; /* Root Delay */
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uint8_t rootdispersion[4]; /* Root dispersion */
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uint8_t refid[4]; /* Reference Clock Identifier */
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uint8_t reftimestamp[8]; /* Rererence Timestamp */
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uint8_t origtimestamp[8]; /* Originate Timestamp */
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uint8_t recvtimestamp[8]; /* Receive Timestamp */
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uint8_t xmittimestamp[8]; /* Transmit Timestamp */
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uint8_t keyid[4]; /* Authenticator data */
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uint8_t digest1[4];
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uint8_t digest2[4];
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uint8_t digest3[4];
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uint8_t digest4[4];
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};
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#endif /* __APPS_NETUTILS_NTPCLIENT_NTPV3_H */
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