static void dtls1_set_handshake_header(SSL *s, int htype, unsigned long len)
{
    unsigned char *p = (unsigned char *)s->init_buf->data;
    dtls1_set_message_header(s, p, htype, len, 0, len);
    s->init_num = (int)len + DTLS1_HM_HEADER_LENGTH;
    s->init_off = 0;
    /* Buffer the message to handle re-xmits */
    dtls1_buffer_message(s, 0);
}

Unknown