1
2
3 """Network Time Protocol."""
4
5 import dpkt
6
7
8
9
10 NO_WARNING = 0
11 LAST_MINUTE_61_SECONDS = 1
12 LAST_MINUTE_59_SECONDS = 2
13 ALARM_CONDITION = 3
14
15
16 RESERVED = 0
17 SYMMETRIC_ACTIVE = 1
18 SYMMETRIC_PASSIVE = 2
19 CLIENT = 3
20 SERVER = 4
21 BROADCAST = 5
22 CONTROL_MESSAGE = 6
23 PRIVATE = 7
24
25 -class NTP(dpkt.Packet):
26 __hdr__ = (
27 ('flags', 'B', 0),
28 ('stratum', 'B', 0),
29 ('interval', 'B', 0),
30 ('precision', 'B', 0),
31 ('delay', 'I', 0),
32 ('dispersion', 'I', 0),
33 ('id', '4s', 0),
34 ('update_time', '8s', 0),
35 ('originate_time', '8s', 0),
36 ('receive_time', '8s', 0),
37 ('transmit_time', '8s', 0)
38 )
39
41 return (self.flags >> 3) & 0x7
43 self.flags = (self.flags & ~0x38) | ((v & 0x7) << 3)
44 v = property(_get_v, _set_v)
45
47 return (self.flags >> 6) & 0x3
50 li = property(_get_li, _set_li)
51
53 return (self.flags & 0x7)
56 mode = property(_get_mode, _set_mode)
57
58 if __name__ == '__main__':
59 import unittest
60
63 n = NTP(self.s)
64 self.failUnless(self.s == str(n))
65
81
82 s = '\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'
83 unittest.main()
84