How to implement QUIC Server Name Indication (SNI) Detection in c++?

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I'm trying to write a function in c++ that will take UDP payload_buffer as an argument and return hostname used by the the QUIC session if the buffer contain the SNI.

It should be able to detect QUIC version compatible with 3 versions: Google QUIC Q043, Google QUIC Q046 and Google QUIC Q050.

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You need to decrypt the initial packet. The salt of each Quic version might be different. Suggest you to check the wireshark's source code.

A good article: https://blogs.keysight.com/blogs/tech/nwvs.entry.html/2021/07/17/looking_into_quicpa-pUtF.html