[openssl-users] Cancelling handshake in the middle

Otis Evans otisevans98 at gmail.com
Sun Apr 3 08:17:08 UTC 2016

Explain more
On Apr 3, 2016 2:59 AM, "Michael Kravchenko" <mkrav at yahoo-inc.com> wrote:

> Hi,
> (My question is regarding a problem I discovered while developing a DTLS
> client, but I'm not sure that it's specific to DTLS)
> What is the proper way to cancel a handshake process in the middle? I have
> a client working with non-blocking BIO, which performs a series of
> SSL_connect() calls to establish connection to the server. Let's say that
> during the handshake process, the client, for some reason, decides to abort
> it. Ideally, I'd like the server to receive an alert message indicating
> that the client will not be finishing the handshake.
> SSL_shutdown() cannot be used here, since it works only after the
> handshake.
> I cannot find any public API call that could be used in this situation.
> ssl3_send_alert() is not a public API call.
> Any ideas on what would be the best way to proceed in this situation?
> Thanks
> --
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