SSL_SESSION_get_protocol_version, SSL_SESSION_set_protocol_version - get and set the session protocol

       Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04             SSL_SESSION_GET_PROTOCOL_VERSION(3SSL)

SSL_SESSION_get_protocol_version() returns the protocol version number used by session s.

       SSL_SESSION_set_protocol_version() sets the protocol version associated with the SSL_SESSION object s to
       the value version. This value should be a version constant such as TLS1_3_VERSION etc. For example, this
       could be used to set up a session based PSK (see SSL_CTX_set_psk_use_session_callback(3)).

       The SSL_SESSION_get_protocol_version() function was added in OpenSSL 1.1.0.  The
       SSL_SESSION_set_protocol_version() function was added in OpenSSL 1.1.1.

       SSL_SESSION_get_protocol_version, SSL_SESSION_set_protocol_version - get and set the session protocol
       version

SSL_SESSION_get_protocol_version() returns a number indicating the protocol version used for the session;
       this number matches the constants e.g.TLS1_VERSION, TLS1_2_VERSION or TLS1_3_VERSION.

       Note that the SSL_SESSION_get_protocol_version() function does not perform a null check on the provided
       session s pointer.

       SSL_SESSION_set_protocol_version() returns 1 on success or 0 on failure.

ssl(7), SSL_CTX_set_psk_use_session_callback(3)

        #include <openssl/ssl.h>

        int SSL_SESSION_get_protocol_version(const SSL_SESSION *s);
        int SSL_SESSION_set_protocol_version(SSL_SESSION *s, int version);