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SatCat5
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SatCat5
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Message headers for the Network Time Protocol (NTP / IETF RFC-5905).
This struct represents the NTP message header, as defined in RFC-5905 Section 7.3 and Figure 8. It includes all basic information, but not the extension fields or message digest. Support for MD5 authentication may be added in future versions.
Definition at line 20 of file ntp_header.h.
#include <ntp_header.h>
Public Member Functions | |
| Header (const Header &t)=default | |
| Header & | operator= (const Header &t)=default |
| void | log_to (satcat5::log::LogBuffer &wr) const |
| Human-readable formatting of the header contents. | |
| bool | read_from (satcat5::io::Readable *rd) |
| Read this header from a data source. | |
| void | write_to (satcat5::io::Writeable *wr) const |
| Write this header to a data sink. | |
| u8 | li () const |
| Accessors for splitting LI, VN, and Mode fields. | |
| u8 | vn () const |
| Accessors for splitting LI, VN, and Mode fields. | |
| u8 | mode () const |
| Accessors for splitting LI, VN, and Mode fields. | |
Public Attributes | |
| u8 | lvm |
| Combined LI + VN + Mode. | |
| u8 | stratum |
| Hops to grandmaster (1-15) | |
| s8 | poll |
| Interval = 2^N seconds. | |
| s8 | precision |
| Precision = 2^N seconds. | |
| u32 | rootdelay |
| Round trip delay to grandmaster. | |
| u32 | rootdisp |
| Total dispersion to grandmaster. | |
| u32 | refid |
| Server-ID or KoD code. | |
| u64 | ref |
| Time of last sync to parent. | |
| u64 | org |
| T1 (Client transmit time) | |
| u64 | rec |
| T2 (Server receive time) | |
| u64 | xmt |
| T3 (Server transmit time) | |
Static Public Attributes | |
| static constexpr unsigned | HEADER_LEN = 48 |
| The basic header is exactly 12 words = 48 bytes long. | |
| static constexpr u8 | LI_MASK = (3 << 6) |
| Leap second indictor (LI) for last minute of current day. | |
| static constexpr u8 | LEAP_NONE = (0 << 6) |
| static constexpr u8 | LEAP_61 = (1 << 6) |
| static constexpr u8 | LEAP_59 = (2 << 6) |
| static constexpr u8 | LEAP_UNK = (3 << 6) |
| static constexpr u8 | VN_MASK = (7 << 3) |
| Version number is always 4. | |
| static constexpr u8 | VERSION_3 = (3 << 3) |
| static constexpr u8 | VERSION_4 = (4 << 3) |
| static constexpr u8 | MODE_MASK = 0x7 |
| Mode number indicates client or server role. | |
| static constexpr u8 | MODE_RSVD = 0 |
| static constexpr u8 | MODE_SYMM1 = 1 |
| static constexpr u8 | MODE_SYMM0 = 2 |
| static constexpr u8 | MODE_CLIENT = 3 |
| static constexpr u8 | MODE_SERVER = 4 |
| static constexpr u8 | MODE_BCAST = 5 |
| static constexpr u8 | MODE_CTRL = 6 |
| static constexpr u8 | MODE_PRIVAT = 7 |
| static constexpr u32 | KISS_ACST = 0x41435354u |
| Reserved RefIDs, aka "kiss codes" (Section 7.4) | |
| static constexpr u32 | KISS_AUTH = 0x41555448u |
| static constexpr u32 | KISS_AUTO = 0x4155544Fu |
| static constexpr u32 | KISS_BCST = 0x42435354u |
| static constexpr u32 | KISS_CRYP = 0x43525950u |
| static constexpr u32 | KISS_DENY = 0x44454E59u |
| static constexpr u32 | KISS_DROP = 0x44524F50u |
| static constexpr u32 | KISS_RSTR = 0x52535452u |
| static constexpr u32 | KISS_INIT = 0x494E4954u |
| static constexpr u32 | KISS_MCST = 0x4D435354u |
| static constexpr u32 | KISS_NKEY = 0x4E4B4559u |
| static constexpr u32 | KISS_RATE = 0x52415445u |
| static constexpr u32 | KISS_RMOT = 0x524D4F54u |
| static constexpr u32 | KISS_STEP = 0x53544550u |
| static constexpr s8 | TIME_1HOUR = 12 |
| Named constants for polling intervals and dispersion. | |
| static constexpr s8 | TIME_32MIN = 11 |
| static constexpr s8 | TIME_16MIN = 10 |
| static constexpr s8 | TIME_8MIN = 9 |
| static constexpr s8 | TIME_4MIN = 8 |
| static constexpr s8 | TIME_2MIN = 7 |
| static constexpr s8 | TIME_1MIN = 6 |
| static constexpr s8 | TIME_32SEC = 5 |
| static constexpr s8 | TIME_16SEC = 4 |
| static constexpr s8 | TIME_8SEC = 3 |
| static constexpr s8 | TIME_4SEC = 2 |
| static constexpr s8 | TIME_2SEC = 1 |
| static constexpr s8 | TIME_1SEC = 0 |
| static constexpr s8 | TIME_500MSEC = -1 |
| static constexpr s8 | TIME_250MSEC = -2 |
| static constexpr s8 | TIME_125MSEC = -3 |
| static constexpr s8 | TIME_64MSEC = -4 |
| static constexpr s8 | TIME_32MSEC = -5 |
| static constexpr s8 | TIME_16MSEC = -6 |
| static constexpr s8 | TIME_8MSEC = -7 |
| static constexpr s8 | TIME_4MSEC = -8 |
| static constexpr s8 | TIME_2MSEC = -9 |
| static constexpr s8 | TIME_1MSEC = -10 |
| static constexpr s8 | TIME_500USEC = -11 |
| static constexpr s8 | TIME_250USEC = -12 |
| static constexpr s8 | TIME_125USEC = -13 |
| static constexpr s8 | TIME_64USEC = -14 |
| static constexpr s8 | TIME_32USEC = -15 |
| static constexpr s8 | TIME_16USEC = -16 |
| static constexpr s8 | TIME_8USEC = -17 |
| static constexpr s8 | TIME_4USEC = -18 |
| static constexpr s8 | TIME_2USEC = -19 |
| static constexpr s8 | TIME_1USEC = -20 |
| static constexpr s8 | TIME_500NSEC = -21 |
| static constexpr s8 | TIME_250NSEC = -22 |
| static constexpr s8 | TIME_125NSEC = -23 |
| static constexpr s8 | TIME_64NSEC = -24 |
| static constexpr s8 | TIME_32NSEC = -25 |
| static constexpr s8 | TIME_16NSEC = -26 |
| static constexpr s8 | TIME_8NSEC = -27 |
| static constexpr s8 | TIME_4NSEC = -28 |
| static constexpr s8 | TIME_2NSEC = -29 |
| static constexpr s8 | TIME_1NSEC = -30 |
1.9.1