def __recv_packet(self):
if len(self.rbuffer) < 12:
return
(signature, checksum, sz) = struct.unpack("!III", self.rbuffer[:12])
if not signature == 0xDECAFBAD:
raise BufferError("Invalid signature in packet header")
if len(self.rbuffer) < 12 + sz:
return
content = self.rbuffer[12:(12 + sz)]
calc_csum = ExternalInterface.adler32(content)
if not calc_csum == checksum:
print(content.encode('hex'))
raise BufferError(
"Invalid checksum in packet header {} vs {}".format(
calc_csum, checksum))
cmd = kismet_pb2.Command()
cmd.ParseFromString(content)
if cmd.command in self.handlers:
self.handlers[cmd.command](cmd.seqno, cmd.content)
else:
print("Unhandled", cmd.command)
self.rbuffer = self.rbuffer[12 + sz:]
def write_ext_packet(self, cmdtype, content):
"""
Generate a Kismet external interface command, frame, and transmit it.
:param cmdtype: Command type string
:param content: Command content, must be a serializable protobuf object
:return: None
"""
cp = kismet_pb2.Command()
cp.command = cmdtype
cp.seqno = self.cmdnum
cp.content = content.SerializeToString()
self.write_raw_packet(cp)
self.cmdnum = self.cmdnum + 1