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I would say that golang is good enough. But if you are interested , you could go for Rust. Multiple teams have built extremely high performance network manipulation tools in Rust - like linkerd-tcp .

Unless you were planning to use Ragel.

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As I said, it'll be in C++, Go is great, Rust too, but I just can't get used to their syntax :D

Once I saw OpenSnitch I decided to write my own in Rust (mostly as a learning experience for myself)[1] -- it's still obviously WIP as it doesn't even filter packets yet! My intention is to make it have a remote API so that policy decisions aren't done in the daemon but are done in swappable clients.

[1]: https://github.com/cyphar/whistled

I thought the Ragel stuff was back in.

I hoped so too. I think someone is forking it, but AFAIK it's c or ASM only.

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