def work(self, input_items, output_items):
out = output_items[0]
# Get single IP packet from TUN Device
buf = self.tun_handler.read()
if self.use_ot_packets:
# Create smaller OT packet from IP packet
#packet = PacketHandler.to_ot(buf[4:])
packet = PacketHandler.to_ot(buf)
else:
#packet = dpkt.ip.IP(buf[4:])
packet = dpkt.ip.IP(buf)
# TODO: DEBUG message, remove in production
print "TUN Source: ", PacketHandler.show(packet)
# Write packet to output buffer
result = np.fromstring(str(packet), dtype=np.uint8)
print "Packetlänge source "+ str(len(result))
out[:len(result)] = result
# Write length tag to output buffer
self.add_item_tag(0, self.nitems_written(0),
pmt.string_to_symbol(self.len_tag_key),
pmt.from_long(len(result)),
pmt.PMT_NIL)
return len(result)
def handle_msg(self, msg):
buf = pmt.to_python(msg)[1]
# Cast numpy buf to string to prevent doomsday
buf = ''.join(map(chr, buf))
if self.use_ot_packets:
addr = self.tun_handler.tun.addr
dstaddr = self.tun_handler.tun.dstaddr
packet = PacketHandler.to_ip(buf, dstaddr, addr)
else:
packet = dpkt.ip.IP(buf)
# TODO: DEBUG message, remove in production
print "TUN Sink: ", PacketHandler.show(packet)
# Write packet to TUN Device
#print len(str(packet))
# TODO: IFF_NO_PI (remove 4 byte)
#self.tun_handler.write(' ' * 4 + str(packet))
self.tun_handler.write(str(packet))