#include <openssl/ssl.h> int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *method); int SSL_set_ssl_method(SSL *s, const SSL_METHOD *method); const SSL_METHOD *SSL_get_ssl_method(const SSL *ssl);
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_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 function pointer to the TLS/SSL method set in ssl.
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.
The following return values can occur for SSL_CTX_set_ssl_version() and SSL_set_ssl_method():
The new choice failed, check the error stack to find out the reason.
The operation succeeded.
SSL_CTX_new(3), SSL_new(3), SSL_clear(3), ssl(7), SSL_set_connect_state(3)
SSL_CTX_set_ssl_version() was deprecated in OpenSSL 3.0.
Copyright 2000-2020 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>.
The man pages SSL_get_ssl_method.3ossl(3) and SSL_set_ssl_method.3ossl(3) are aliases of SSL_CTX_set_ssl_version.3ossl(3).