[tproxy] Sample/test code

Hello, I am a new user of TPROXY, and wonder if there is an answer to this question already. Is there a sample piece of proxy (user process) code that I can look at to quickly understand how to write such a proxy? I looked at squid, stunnel etc. codes, but deciphering those is harder than I thought. Netcat version mismatch is another story altogether. Can anyone point to sample transparent proxy code that uses the TPROXY feature? If it does not exist, then I think it should be created :-) Sumedh