#---------- ipif (SLIP) subprocess ----------
-class SlipProtocol(twisted.internet.protocol.ProcessProtocol):
- # caller must define method receivedPacket(packet)
- def __init__(self):
+class SlipStreamDecoder():
+ def __init__(self, on_packet):
+ # we will call packet(<packet>)
self._buffer = b''
- def connectionMade(self): pass
- def outReceived(self, data):
+ self._on_packet = on_packet
+
+ def inputdata(self, data):
#print('SLIP-GOT ', repr(data))
self._buffer += data
packets = slip.decode(self._buffer)
self._buffer = packets.pop()
for packet in packets:
- if not len(packet): continue
- self.receivedPacket(packet)
+ self._maybe_packet(packet)
+
+ def _maybe_packet(self, packet):
+ if len(packet):
+ self._on_packet(packet)
+
def flush(self):
- if len(self._buffer):
- self.receivedPacket(self._buffer)
- self._buffer = ''
+ self._maybe_packet(self._buffer)
+ self._buffer = b''
class _IpifProcessProtocol(SlipProtocol):
def __init__(self, router):
self._router = router
- super.__init__()
- def receivedPacket(self, packet):
+ self._decoder = SlipStreamDecoder(self.slip_on_packet)
+ def connectionMade(self): pass
+ def outReceived(self, data):
+ self._decoder.inputdata(data)
+ def slip_on_packet(self, packet):
(saddr, daddr) = packet_addrs(packet)
if saddr.is_link_local or daddr.is_link_local:
log_discard(packet, saddr, daddr, 'link-local')