使用python取得NTP server 時間校正

import socket

import struct

import time

import json

import sys

def get_ntp_time(ntp_server):

    ntp_packet = b'\x1b' + 47 * b'\0'

    try:

        client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

        client.settimeout(2.0)

        client.sendto(ntp_packet, (ntp_server, 123))

        data, addr = client.recvfrom(1024)

        if data:

            unpacked_data = struct.unpack('!12I', data)

            transmit_timestamp = float(unpacked_data[10]) + float(unpacked_data[11]) / 2**32

            ntp_time = transmit_timestamp - 2208988800

            return ntp_time

    except Exception as e:

        print("Error:", str(e))

    finally:

        client.close()

    return None

if __name__ == "__main__":

    if len(sys.argv) != 2:

        print("Usage: python ntp_server.py NTP_SERVER_ADDRESS")

        sys.exit(1)

    ntp_server = sys.argv[1]

    ntp_time = get_ntp_time(ntp_server)

    if ntp_time is not None:

        json_output = {

            "ntp_server": ntp_server,

            "timestamp": ntp_time*1000

        }

        print(json.dumps(json_output, indent=2))

    else:

        print("Failed to get NTP time.")