// | |
// ntpClient.h | |
// | |
#ifndef __NTPCLIENT_H__ | |
#define __NTPCLIENT_H__ | |
#define NTP_PORT 123 | |
typedef uint32_t quint32; | |
typedef int32_t qint32; | |
typedef uint8_t quint8; | |
typedef int8_t qint8; | |
typedef union _SNtpFlags SNtpFlags; | |
/** | |
* 64-bit NTP timestamp. | |
*/ | |
struct __attribute__ ((__packed__)) _SNtpTimestamp { | |
/** Number of seconds passed since Jan 1 1900, in big-endian format. */ | |
quint32 seconds; | |
/** Fractional time part, in <tt>1/0xFFFFFFFF</tt>s of a second. */ | |
quint32 fraction; | |
}; | |
typedef struct _SNtpTimestamp SNtpTimestamp; | |
/** | |
* Mandatory part of an NTP packet | |
*/ | |
struct SNtpPacket { | |
/** Flags. */ | |
unsigned char flags; // value 0xDB : mode 3 (client), version 3, leap indicator unknown 3 | |
/** Stratum of the clock. */ | |
quint8 stratum; // value 0 : unspecified | |
/** Maximum interval between successive messages, in log2 seconds. Note that the value is signed. */ | |
qint8 poll; // 10 means 1 << 10 = 1024 seconds | |
/** Precision of the clock, in log2 seconds. Note that the value is signed. */ | |
qint8 precision; // 0xFA = 250 = 0.015625 seconds | |
/** Round trip time to the primary reference source, in NTP short format. */ | |
qint32 rootDelay; // 0x5D2E = 23854 or (23854/65535)= 0.3640 sec | |
/** Nominal error relative to the primary reference source. */ | |
qint32 rootDispersion; // 0x0008 CAC8 = 8.7912 seconds | |
/** Reference identifier (either a 4 character string or an IP address). */ | |
qint8 referenceID[4]; // or just 0000 | |
/** The time at which the clock was last set or corrected. */ | |
SNtpTimestamp referenceTimestamp; // Current time | |
/** The time at which the request departed the client for the server. */ | |
SNtpTimestamp originateTimestamp; // Keep 0 | |
/** The time at which the request arrived at the server. */ | |
SNtpTimestamp receiveTimestamp; // Keep 0 | |
/** The time at which the reply departed the server for client. */ | |
SNtpTimestamp transmitTimestamp; | |
}; | |
/* Add this number to get secs since 1-1-1900 */ | |
#define TIME1970 2208988800UL | |
#endif // __NTPCLIENT_H__ |