static int dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
static int dtls1_handshake_write(SSL *s);
int dtls1_listen(SSL *s, struct sockaddr *client);
static int dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
static int dtls1_handshake_write(SSL *s);
int dtls1_listen(SSL *s, struct sockaddr *client);