int ssl_prepare_serverhello_tlsext(SSL *s);
int ssl_check_clienthello_tlsext(SSL *s);
int ssl_check_serverhello_tlsext(SSL *s);
int ssl_prepare_serverhello_tlsext(SSL *s);
int ssl_check_clienthello_tlsext(SSL *s);
int ssl_check_serverhello_tlsext(SSL *s);