# $Id: ntp.py 48 2008-05-27 17:31:15Z yardley $
# -*- coding: utf-8 -*-
"""Network Time Protocol."""
from __future__ import print_function
from . import dpkt
from .decorators import deprecated
# NTP v4
# Leap Indicator (LI) Codes
NO_WARNING = 0
LAST_MINUTE_61_SECONDS = 1
LAST_MINUTE_59_SECONDS = 2
ALARM_CONDITION = 3
# Mode Codes
RESERVED = 0
SYMMETRIC_ACTIVE = 1
SYMMETRIC_PASSIVE = 2
CLIENT = 3
SERVER = 4
BROADCAST = 5
CONTROL_MESSAGE = 6
PRIVATE = 7
[docs]class NTP(dpkt.Packet):
"""Network Time Protocol.
TODO: Longer class information....
Attributes:
__hdr__: Header fields of NTP.
TODO.
"""
__hdr__ = (
('flags', 'B', 0),
('stratum', 'B', 0),
('interval', 'B', 0),
('precision', 'B', 0),
('delay', 'I', 0),
('dispersion', 'I', 0),
('id', '4s', 0),
('update_time', '8s', 0),
('originate_time', '8s', 0),
('receive_time', '8s', 0),
('transmit_time', '8s', 0)
)
@property
def v(self):
return (self.flags >> 3) & 0x7
@v.setter
def v(self, v):
self.flags = (self.flags & ~0x38) | ((v & 0x7) << 3)
@property
def li(self):
return (self.flags >> 6) & 0x3
@li.setter
def li(self, li):
self.flags = (self.flags & ~0xc0) | ((li & 0x3) << 6)
@property
def mode(self):
return self.flags & 0x7
@mode.setter
def mode(self, mode):
self.flags = (self.flags & ~0x7) | (mode & 0x7)
__s = b'\x24\x02\x04\xef\x00\x00\x00\x84\x00\x00\x33\x27\xc1\x02\x04\x02\xc8\x90\xec\x11\x22\xae\x07\xe5\xc8\x90\xf9\xd9\xc0\x7e\x8c\xcd\xc8\x90\xf9\xd9\xda\xc5\xb0\x78\xc8\x90\xf9\xd9\xda\xc6\x8a\x93'
[docs]def test_ntp_pack():
n = NTP(__s)
assert (__s == bytes(n))
[docs]def test_ntp_unpack():
n = NTP(__s)
assert (n.li == NO_WARNING)
assert (n.v == 4)
assert (n.mode == SERVER)
assert (n.stratum == 2)
assert (n.id == b'\xc1\x02\x04\x02')
# test get/set functions
n.li = ALARM_CONDITION
n.v = 3
n.mode = CLIENT
assert (n.li == ALARM_CONDITION)
assert (n.v == 3)
assert (n.mode == CLIENT)
if __name__ == '__main__':
test_ntp_pack()
test_ntp_unpack()
print('Tests Successful...')