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# -*- test-case-name: twisted.pair.test.test_rawudp -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Implementation of raw packet interfaces for UDP
"""
import struct
from twisted.internet import protocol
from twisted.pair import raw
from zope.interface import implementer
class UDPHeader:
def __init__(self, data):
(self.source, self.dest, self.len, self.check) \
= struct.unpack("!HHHH", data[:8])
@implementer(raw.IRawDatagramProtocol)
class RawUDPProtocol(protocol.AbstractDatagramProtocol):
def __init__(self):
self.udpProtos = {}
def addProto(self, num, proto):
if not isinstance(proto, protocol.DatagramProtocol):
raise TypeError('Added protocol must be an instance of DatagramProtocol')
if num < 0:
raise TypeError('Added protocol must be positive or zero')
if num >= 2**16:
raise TypeError('Added protocol must fit in 16 bits')
if num not in self.udpProtos:
self.udpProtos[num] = []
self.udpProtos[num].append(proto)
def datagramReceived(self,
data,
partial,
source,
dest,
protocol,
version,
ihl,
tos,
tot_len,
fragment_id,
fragment_offset,
dont_fragment,
more_fragments,
ttl):
header = UDPHeader(data)
for proto in self.udpProtos.get(header.dest, ()):
proto.datagramReceived(data[8:],
(source, header.source))
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