reverting to dpkt v1.8.6 instead of 1.8.6.2 to avoid importing error of pystone modue

1 files changed, 95 insertions, 0 deletions

diff --git a/scripts/external_libs/dpkt-1.8.6.2/dpkt/sctp.py b/scripts/external_libs/dpkt-1.8.6.2/dpkt/sctp.py
new file mode 100644
index 00000000..4ef251c8
--- /dev/null
+++ b/scripts/external_libs/dpkt-1.8.6.2/dpkt/sctp.py
@@ -0,0 +1,95 @@
+# $Id: sctp.py 23 2006-11-08 15:45:33Z dugsong $
+# -*- coding: utf-8 -*-
+"""Stream Control Transmission Protocol."""
+
+import dpkt
+import crc32c
+
+# Stream Control Transmission Protocol
+# http://tools.ietf.org/html/rfc2960
+
+# Chunk Types
+DATA = 0
+INIT = 1
+INIT_ACK = 2
+SACK = 3
+HEARTBEAT = 4
+HEARTBEAT_ACK = 5
+ABORT = 6
+SHUTDOWN = 7
+SHUTDOWN_ACK = 8
+ERROR = 9
+COOKIE_ECHO = 10
+COOKIE_ACK = 11
+ECNE = 12
+CWR = 13
+SHUTDOWN_COMPLETE = 14
+
+
+class SCTP(dpkt.Packet):
+    __hdr__ = (
+        ('sport', 'H', 0),
+        ('dport', 'H', 0),
+        ('vtag', 'I', 0),
+        ('sum', 'I', 0)
+    )
+
+    def unpack(self, buf):
+        dpkt.Packet.unpack(self, buf)
+        l = []
+        while self.data:
+            chunk = Chunk(self.data)
+            l.append(chunk)
+            self.data = self.data[len(chunk):]
+        self.data = self.chunks = l
+
+    def __len__(self):
+        return self.__hdr_len__ + sum(map(len, self.data))
+
+    def __str__(self):
+        l = [str(x) for x in self.data]
+        if self.sum == 0:
+            s = crc32c.add(0xffffffffL, self.pack_hdr())
+            for x in l:
+                s = crc32c.add(s, x)
+            self.sum = crc32c.done(s)
+        return self.pack_hdr() + ''.join(l)
+
+
+class Chunk(dpkt.Packet):
+    __hdr__ = (
+        ('type', 'B', INIT),
+        ('flags', 'B', 0),
+        ('len', 'H', 0)
+    )
+
+    def unpack(self, buf):
+        dpkt.Packet.unpack(self, buf)
+        self.data = self.data[:self.len - self.__hdr_len__]
+
+
+__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'
+
+
+def test_sctp_pack():
+    sctp = SCTP(__s)
+    assert (__s == str(sctp))
+    sctp.sum = 0
+    assert (__s == str(sctp))
+
+
+def test_sctp_unpack():
+    sctp = SCTP(__s)
+    assert (sctp.sport == 32836)
+    assert (sctp.dport == 80)
+    assert (len(sctp.chunks) == 1)
+    assert (len(sctp) == 72)
+    chunk = sctp.chunks[0]
+    assert (chunk.type == INIT)
+    assert (chunk.len == 60)
+
+
+if __name__ == '__main__':
+    test_sctp_pack()
+    test_sctp_unpack()
+    print 'Tests Successful...'
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