SSL_CTX_set_ssl_version, SSL_CTX_get_ssl_method, SSL_set_ssl_method, SSL_get_ssl_method - choose a new

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       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_CTX_SET_SSL_VERSION(3SSL)

SSL_CTX_set_ssl_version() sets a new default TLS/SSL method for SSL objects newly created from this ctx.
       Most of the configuration attached to the SSL_CTX object is retained, with the exception of the
       configured TLS ciphers, which are reset to the default values.  SSL objects already created from this
       SSL_CTX with SSL_new(3) are not affected, except when SSL_clear(3) is being called, as described below.

       SSL_CTX_get_ssl_method() returns the SSL_METHOD which was used to construct the SSL_CTX.

       SSL_set_ssl_method() sets a new TLS/SSL method for a particular ssl object. It may be reset, when
       SSL_clear() is called.

       SSL_get_ssl_method() returns a pointer to the TLS/SSL method set in ssl.

SSL_CTX_set_ssl_version() was deprecated in OpenSSL 3.0.

       SSL_CTX_set_ssl_version, SSL_CTX_get_ssl_method, SSL_set_ssl_method, SSL_get_ssl_method - choose a new
       TLS/SSL method

       The available method choices are described in SSL_CTX_new(3).

       When SSL_clear(3) is called and no session is connected to an SSL object, the method of the SSL object is
       reset to the method currently set in the corresponding SSL_CTX object.

       SSL_CTX_set_version() has unusual semantics and no clear use case; it would usually be preferable to
       create a new SSL_CTX object than to try to reuse an existing one in this fashion.  Its usage is
       considered deprecated.

       SSL_set_ssl_method() cannot be used to change a non-QUIC SSL object to a QUIC SSL object or vice versa,
       or change a QUIC SSL object from one QUIC method to another.

       The following return values can occur for SSL_CTX_set_ssl_version() and SSL_set_ssl_method():

       0   The new choice failed, check the error stack to find out the reason.

       1   The operation succeeded.

       SSL_CTX_get_ssl_method() and SSL_get_ssl_method() always return non-NULL pointers.

SSL_CTX_new(3), SSL_new(3), SSL_clear(3), ssl(7), SSL_set_connect_state(3)

        #include <openssl/ssl.h>

        int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *method);
        const SSL_METHOD *SSL_CTX_get_ssl_method(const SSL_CTX *ctx);

        int SSL_set_ssl_method(SSL *s, const SSL_METHOD *method);
        const SSL_METHOD *SSL_get_ssl_method(const SSL *ssl);