+
+#---------- ipif (SLIP) subprocess ----------
+
+class _IpifProcessProtocol(twisted.internet.protocol.ProcessProtocol):
+ def __init__(self, router):
+ self._buffer = b''
+ self._router = router
+ def connectionMade(self): pass
+ def outReceived(self, data):
+ #print('RECV ', repr(data))
+ self._buffer += data
+ packets = slip.decode(self._buffer)
+ self._buffer = packets.pop()
+ for packet in packets:
+ if not len(packet): continue
+ (saddr, daddr) = packet_addrs(packet)
+ self._router(packet, saddr, daddr)
+ def processEnded(self, status):
+ status.raiseException()
+
+def start_ipif(command, router):
+ global ipif
+ ipif = _IpifProcessProtocol(router)
+ reactor.spawnProcess(ipif,
+ '/bin/sh',['sh','-xc', command],
+ childFDs={0:'w', 1:'r', 2:2})
+
+def queue_inbound(packet):
+ ipif.transport.write(slip.delimiter)
+ ipif.transport.write(slip.encode(packet))
+ ipif.transport.write(slip.delimiter)
+