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

#include <openssl/ssl.h>
SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *method);
SSL_set_ssl_method(SSL *s, const SSL_METHOD *method);
const SSL_METHOD *
SSL_get_ssl_method(SSL *ssl);

SSL_CTX_set_ssl_version() sets a new default TLS/SSL method for SSL objects newly created from this ctx. SSL objects already created with SSL_new(3) are not affected, except when SSL_clear(3) is called.
SSL_set_ssl_method() sets a new TLS/SSL method for a particular SSL object s. It may be reset when SSL_clear(3) 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.

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

SSL_CTX_set_ssl_version(), SSL_set_ssl_method(), and SSL_get_ssl_method() first appeared in SSLeay 0.8.0 and have been available since OpenBSD 2.4.
March 27, 2018 OpenBSD-current