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wodow
Asked: 2009-10-30 10:28:42 +0800 CST

Rewriting UDP packets on Linux

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I would like to rewrite the contents/payload of UDP packets as they are received by a machine, on selected reports - before they are passed to the listening application.

For example, I would like to change the headers of a UDP-based protocol by using grep-like regular expressions (to add, remove or change parts of each message received).

Is this possible with a software firewall or similar tool?

Thanks all!

rewrite

3 Answers

  1. Such a tool is called a UDP Proxy and there are a few out there.

    • Simple UDP Proxy/Pipe
    • udpproxy
    • UProxy
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  2. Best Answer

    If this isn't for production, but rather just learning. I recommend Scapy, you can craft and replay packets on a object oriented interface that relates to the OSI model. It acts like an interactive python console. You can also sniff with it, lots of fun ;-)

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  3. TRIPP may also be a solution:

    http://tripp.dynalias.org/

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