Hi, I sent this patch to the developer list a while ago after I made it for a proof-of-concept in our network. It turns out we will need to support telnet's START_TLS connection method[1] in our mainframe environment, and it would make things easier for our testing/debugging if this was supported in OpenSSL by default. So, this is my enhancement request to add this functionality.
The attached patch applies cleanly against the 1.0.0 releases. Let me know if there are any problems. Thanks [1] https://tools.ietf.org/html/draft-altman-telnet-starttls-02
openssl-telnet-starttls.patch
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