Golang: TCP reassembly. How to reassemble TCP segments into one packet upon receipt?

Question

Computer networks

I'm trying to recreate the same thing that the EPAN module does in tshark. But on Go.
I am capturing (using libpcap) the segments of a TCP packet. But I don't know how to assemble them into a single package (reassembly).
How can I track that all packages have arrived? How can I glue them in the right order? How can I decrypt payload?

Answer 1

Familiarize yourself with the RFC standards for the TCP protocol and those protocols that you are going to "decrypt". All relevant rfcs can be found for example here https://tools.ietf.org/html/rfc793. See the wireshark sources for examples of how this is done.