205     msg = SadbMsg(reply)
207     if msg.errno != 0:
208       raise OSError(msg.errno, os.strerror(msg.errno))
211   def SendAndRecv(self, msg, extensions):  argument
213     msg.seq = self.seq
214     msg.pid = os.getpid()
215     msg.len = (len(SadbMsg) + len(extensions)) / 8
216     self.sock.send(msg.Pack() + extensions)
242     msg = self.MakeSadbMsg(SADB_ADD, satype)
254     self.SendAndRecv(msg, self.PackPfKeyExtensions(extlist))
258     msg = self.MakeSadbMsg(SADB_DELETE, satype)
265     self.SendAndRecv(msg, self.PackPfKeyExtensions(extlist))
268   def DecodeSadbMsg(msg):  argument
269     msgtype = _GetConstantName(msg.type, "SADB_")
270     satype = _GetConstantName(msg.satype, "SADB_TYPE_")
273                 msg.version, msgtype, msg.errno, satype, msg.len,
274                 msg.reserved, msg.seq, msg.pid))
287   def ExtensionsLength(msg, struct_type):  argument
288     return (msg.len * 8) - len(struct_type)
304     msg = self.MakeSadbMsg(SADB_DUMP, SADB_TYPE_UNSPEC)
305     received = self.SendAndRecv(msg, "")
307       msg, data = cstruct.Read(received, SadbMsg)
308       extlen = self.ExtensionsLength(msg, SadbMsg)
310       dump.append((msg, self.ParseExtensions(extensions)))
311       if msg.seq == 0:  # End of dump.
317     for msg, extensions in dump:
318       print(self.DecodeSadbMsg(msg))