Here is my fork of mallory: https://bitbucket.org/sskaje/mallory, which, as it’s said, is a powerful TCP/UDP proxy, but way too old.
Here you can find how to install it, but the official repo one.
I created a pull request here, but seems IntrepidusGroup guys are not working on this anymore.
And the TCP/UDP raw protocol debug still not work for me. Hope I can figure it out one day.
Btw, quotes of my commit logs:
MiTM(Man in The Middle) is a good way analysing protocols, especially when there’s an SSL. http://en.wikipedia.org/wiki/Man-in-the-middle_attack
To analyse HTTP/HTTPS protocol, we have Charles Proxy. Posts on my blog can be found https://sskaje.me/tag/charles-proxy/ (there’s another MiTM proxy, ‘mitmproxy’, https://github.com/mitmproxy/mitmproxy and http://mitmproxy.org/, will try later.)
For others, mallory is recommended.
Mallory is an extensible TCP/UDP man in the middle proxy that is designed to be run as a gateway. Unlike other tools of its kind, Mallory supports modifying non-standard protocols on the fly.
We have mallory from https://bitbucket.org/IntrepidusGroup/mallory and https://intrepidusgroup.com/insight/mallory/.