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Compare the time of two ntp servers.
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#!/usr/bin/python | |
import struct, sys, time, argparse | |
from socket import socket, AF_INET, SOCK_DGRAM | |
error_margin = 3 | |
def get_time(host): | |
sock = socket(AF_INET, SOCK_DGRAM) | |
sock.settimeout(2) | |
sock.sendto('\x1b' + 47 * '\0', (host, 123)) | |
data, address = sock.recvfrom( 1024 ) | |
sock.close() | |
if data: | |
t = struct.unpack( '!12I', data )[10] | |
t -= 2208988800L # Time 1970 | |
return t | |
else: | |
return False | |
def main(): | |
parser = argparse.ArgumentParser() | |
parser.add_argument('time_server', help='specify the ntp server you want to check') | |
parser.add_argument('time_reference', help='specify the time reference (another ntp server)') | |
parser.add_argument('-v', '--verbose', help='talk a lot more', action='store_true') | |
args = parser.parse_args() | |
time_server = get_time(args.time_server) | |
time_reference = get_time(args.time_reference) | |
if time_server and time_reference: | |
if args.verbose: | |
print 'Time received from %s = %s (%s)' % (args.time_server, time_server, time.ctime(time_server)) | |
print 'Time received from %s = %s (%s)' % (args.time_reference, time_reference, time.ctime(time_reference)) | |
# if s2 <= s1 + err and s2 >= s1 - err | |
if time_server <= time_reference + error_margin and time_server >= time_reference - error_margin: | |
print 'Times match.' | |
else: | |
print 'Times differ.' | |
if __name__ == "__main__": | |
main() |
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