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