1 # -*- test-case-name: twisted.pair.test.test_ethernet -*-
2 # Copyright (c) Twisted Matrix Laboratories.
3 # See LICENSE for details.
8 """Support for working directly with ethernet frames"""
13 from twisted.internet import protocol
14 from twisted.pair import raw
15 from zope.interface import implements, Interface
18 class IEthernetProtocol(Interface):
19 """An interface for protocols that handle Ethernet frames"""
21 """Add an IRawPacketProtocol protocol"""
23 def datagramReceived():
24 """An Ethernet frame has been received"""
27 def __init__(self, data):
29 (self.dest, self.source, self.proto) \
30 = struct.unpack("!6s6sH", data[:6+6+2])
32 class EthernetProtocol(protocol.AbstractDatagramProtocol):
34 implements(IEthernetProtocol)
39 def addProto(self, num, proto):
40 proto = raw.IRawPacketProtocol(proto)
42 raise TypeError, 'Added protocol must be positive or zero'
44 raise TypeError, 'Added protocol must fit in 16 bits'
45 if num not in self.etherProtos:
46 self.etherProtos[num] = []
47 self.etherProtos[num].append(proto)
49 def datagramReceived(self, data, partial=0):
50 header = EthernetHeader(data[:14])
51 for proto in self.etherProtos.get(header.proto, ()):
52 proto.datagramReceived(data=data[14:],
56 protocol=header.proto)