> is there a way to solve this in non-blocking manner?

I don't think so. To do this in a sensible non-blocking way you would need to have control about the SSL state machine. But OpenSSL only exposes some hooks into this machine with callbacks and I don't think you can have multiple servername callbacks on the same context run in parallel.

In reply to Re^3: Dynamic SNI certificates while upgrading to SSL by noxxi
in thread Dynamic SNI certificates while upgrading to SSL by gr3m1in

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