int dtls1_send_certificate_request(SSL *s)
	{
	unsigned char *p,*d;
	int i,j,nl,off,n;
	STACK_OF(X509_NAME) *sk=NULL;
	X509_NAME *name;
	BUF_MEM *buf;
	unsigned int msg_len;

	if (s->state == SSL3_ST_SW_CERT_REQ_A)
		{
		buf=s->init_buf;

		d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);

		/* get the list of acceptable cert types */
		p++;
		n=ssl3_get_req_cert_type(s,p);
		d[0]=n;
		p+=n;
		n++;

		off=n;
		p+=2;
		n+=2;

		sk=SSL_get_client_CA_list(s);
		nl=0;
		if (sk != NULL)
			{
			for (i=0; i<sk_X509_NAME_num(sk); i++)
				{
				name=sk_X509_NAME_value(sk,i);
				j=i2d_X509_NAME(name,NULL);
				if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
					{
					SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
					goto err;
					}
				p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
				if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
					{
					s2n(j,p);
					i2d_X509_NAME(name,&p);
					n+=2+j;
					nl+=2+j;
					}
				else
					{
					d=p;
					i2d_X509_NAME(name,&p);
					j-=2; s2n(j,d); j+=2;
					n+=j;
					nl+=j;
					}
				}
			}
		/* else no CA names */
		p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
		s2n(nl,p);

		d=(unsigned char *)buf->data;
		*(d++)=SSL3_MT_CERTIFICATE_REQUEST;
		l2n3(n,d);
		s2n(s->d1->handshake_write_seq,d);
		s->d1->handshake_write_seq++;

		/* we should now have things packed up, so lets send
		 * it off */

		s->init_num=n+DTLS1_HM_HEADER_LENGTH;
		s->init_off=0;
#ifdef NETSCAPE_HANG_BUG
/* XXX: what to do about this? */
		p=(unsigned char *)s->init_buf->data + s->init_num;

		/* do the header */
		*(p++)=SSL3_MT_SERVER_DONE;
		*(p++)=0;
		*(p++)=0;
		*(p++)=0;
		s->init_num += 4;
#endif

		/* XDTLS:  set message header ? */
		msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
		dtls1_set_message_header(s, (void *)s->init_buf->data,
			SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);

		/* buffer the message to handle re-xmits */
		dtls1_buffer_message(s, 0);

		s->state = SSL3_ST_SW_CERT_REQ_B;
		}

	/* SSL3_ST_SW_CERT_REQ_B */
	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
	return(-1);
	}