SSL_get_info_callback
*fptr = SSL_get_info_callback(ssl);
LSSL_USED(SSL_get_info_callback);
void (*SSL_get_info_callback(const SSL *ssl))(const SSL *ssl, int type, int val);
SSL_set_info_callback(ret, SSL_get_info_callback(s));
LSSL_ALIAS(SSL_get_info_callback);