1
2
3 """Stream Control Transmission Protocol."""
4
5 import dpkt, crc32c
6
7
8
9
10
11 DATA = 0
12 INIT = 1
13 INIT_ACK = 2
14 SACK = 3
15 HEARTBEAT = 4
16 HEARTBEAT_ACK = 5
17 ABORT = 6
18 SHUTDOWN = 7
19 SHUTDOWN_ACK = 8
20 ERROR = 9
21 COOKIE_ECHO = 10
22 COOKIE_ACK = 11
23 ECNE = 12
24 CWR = 13
25 SHUTDOWN_COMPLETE = 14
26
27 -class SCTP(dpkt.Packet):
28 __hdr__ = (
29 ('sport', 'H', 0),
30 ('dport', 'H', 0),
31 ('vtag', 'I', 0),
32 ('sum', 'I', 0)
33 )
34
43
47
56
58 __hdr__ = (
59 ('type', 'B', INIT),
60 ('flags', 'B', 0),
61 ('len', 'H', 0)
62 )
63
67
68 if __name__ == '__main__':
69 import unittest
70
73 sctp = SCTP(self.s)
74 self.failUnless(self.s == str(sctp))
75 sctp.sum = 0
76 self.failUnless(self.s == str(sctp))
77
79 sctp = SCTP(self.s)
80 self.failUnless(sctp.sport == 32836)
81 self.failUnless(sctp.dport == 80)
82 self.failUnless(len(sctp.chunks) == 1)
83 self.failUnless(len(sctp) == 72)
84
85 chunk = sctp.chunks[0]
86 self.failUnless(chunk.type == INIT)
87 self.failUnless(chunk.len == 60)
88
89 s = '\x80\x44\x00\x50\x00\x00\x00\x00\x30\xba\xef\x54\x01\x00\x00\x3c\x3b\xb9\x9c\x46\x00\x01\xa0\x00\x00\x0a\xff\xff\x2b\x2d\x7e\xb2\x00\x05\x00\x08\x9b\xe6\x18\x9b\x00\x05\x00\x08\x9b\xe6\x18\x9c\x00\x0c\x00\x06\x00\x05\x00\x00\x80\x00\x00\x04\xc0\x00\x00\x04\xc0\x06\x00\x08\x00\x00\x00\x00'
90 unittest.main()
91