[Twisted-Python] New user, help needed with raw UDP packets

[Richard Taylor]

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Hi

I am a completely new user of Twisted. I have read the tutorial and much of 
the manual and I have been searching the archives but I can't work out how to 
get started with my problem.

I am writing a UDP proxy/relay that needs to make detailed changes to the 
internals of the UDP packets as they pass through. I intend to use 'Impacket' 
to access the packet internals. One of the things that I need is to 'fake' 
the destination address of packets leaving the proxy so that they look like 
they have come from the original sender, Impacket has methods to do this for 
'raw' udp packets.

I think that I need to use a sub-class of ConnectedDatagramProtocol to send my 
packets but the "self.transport.write" method takes only the packet payload 
not the headers.

I think that I need to use a sub-class of DatagramProtocol to receive my 
packets but the datagramReceived method only gets the packet payload not the 
headers. 

How can I get at the 'raw' udp packets for receiving and sending?

Sorry if this is obvious.

Many thanks.

Richard

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