SSL_get_version - get the protocol version of a connection.
#include <openssl/ssl.h>
const char *SSL_get_version(const SSL *ssl);
SSL_get_cipher_version()
returns the name of the protocol used for the
connection ssl.
The following strings can occur:
The connection uses the SSLv2 protocol.
The connection uses the SSLv3 protocol.
The connection uses the TLSv1 protocol.
This indicates that no version has been set (no connection established).