Inital import.

Initial fork from f2d678e6e89b6508147086610e985d4e8416e867 (1.0.2 beta).

(This change contains substantial changes from the original and
effectively starts a new history.)

1 files changed, 683 insertions, 0 deletions

diff --git a/ssl/d1_clnt.c b/ssl/d1_clnt.c
new file mode 100644
index 00000000..b0adaa16
--- /dev/null
+++ b/ssl/d1_clnt.c
@@ -0,0 +1,683 @@
+/*
+ * DTLS implementation written by Nagendra Modadugu
+ * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 
+ */
+/* ====================================================================
+ * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <stdio.h>
+
+#include <openssl/bn.h>
+#include <openssl/buf.h>
+#include <openssl/dh.h>
+#include <openssl/evp.h>
+#include <openssl/md5.h>
+#include <openssl/mem.h>
+#include <openssl/obj.h>
+#include <openssl/rand.h>
+
+#include "ssl_locl.h"
+
+static const SSL_METHOD *dtls1_get_client_method(int ver);
+static int dtls1_get_hello_verify(SSL *s);
+
+static const SSL_METHOD *dtls1_get_client_method(int ver)
+	{
+	if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
+		return(DTLSv1_client_method());
+	else if (ver == DTLS1_2_VERSION)
+		return(DTLSv1_2_client_method());
+	else
+		return(NULL);
+	}
+
+IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
+			DTLSv1_client_method,
+			ssl_undefined_function,
+			dtls1_connect,
+			dtls1_get_client_method,
+			DTLSv1_enc_data)
+
+IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
+			DTLSv1_2_client_method,
+			ssl_undefined_function,
+			dtls1_connect,
+			dtls1_get_client_method,
+			DTLSv1_2_enc_data)
+
+IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
+			DTLS_client_method,
+			ssl_undefined_function,
+			dtls1_connect,
+			dtls1_get_client_method,
+			DTLSv1_2_enc_data)
+
+int dtls1_connect(SSL *s)
+	{
+	BUF_MEM *buf=NULL;
+	void (*cb)(const SSL *ssl,int type,int val)=NULL;
+	int ret= -1;
+	int new_state,state,skip=0;
+
+	ERR_clear_error();
+	ERR_clear_system_error();
+
+	if (s->info_callback != NULL)
+		cb=s->info_callback;
+	else if (s->ctx->info_callback != NULL)
+		cb=s->ctx->info_callback;
+	
+	s->in_handshake++;
+	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
+
+#ifndef OPENSSL_NO_HEARTBEATS
+	/* If we're awaiting a HeartbeatResponse, pretend we
+	 * already got and don't await it anymore, because
+	 * Heartbeats don't make sense during handshakes anyway.
+	 */
+	if (s->tlsext_hb_pending)
+		{
+		dtls1_stop_timer(s);
+		s->tlsext_hb_pending = 0;
+		s->tlsext_hb_seq++;
+		}
+#endif
+
+	for (;;)
+		{
+		state=s->state;
+
+		switch(s->state)
+			{
+		case SSL_ST_RENEGOTIATE:
+			s->renegotiate=1;
+			s->state=SSL_ST_CONNECT;
+			s->ctx->stats.sess_connect_renegotiate++;
+			/* break */
+		case SSL_ST_BEFORE:
+		case SSL_ST_CONNECT:
+		case SSL_ST_BEFORE|SSL_ST_CONNECT:
+		case SSL_ST_OK|SSL_ST_CONNECT:
+
+			s->server=0;
+			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
+
+			if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
+			    (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
+				{
+				OPENSSL_PUT_ERROR(SSL, dtls1_connect, ERR_R_INTERNAL_ERROR);
+				ret = -1;
+				goto end;
+				}
+				
+			/* s->version=SSL3_VERSION; */
+			s->type=SSL_ST_CONNECT;
+
+			if (s->init_buf == NULL)
+				{
+				if ((buf=BUF_MEM_new()) == NULL)
+					{
+					ret= -1;
+					goto end;
+					}
+				if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
+					{
+					ret= -1;
+					goto end;
+					}
+				s->init_buf=buf;
+				buf=NULL;
+				}
+
+			if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
+
+			/* setup buffing BIO */
+			if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
+
+			/* don't push the buffering BIO quite yet */
+
+			s->state=SSL3_ST_CW_CLNT_HELLO_A;
+			s->ctx->stats.sess_connect++;
+			s->init_num=0;
+			/* mark client_random uninitialized */
+			memset(s->s3->client_random,0,sizeof(s->s3->client_random));
+			s->d1->send_cookie = 0;
+			s->hit = 0;
+			break;
+
+		case SSL3_ST_CW_CLNT_HELLO_A:
+		case SSL3_ST_CW_CLNT_HELLO_B:
+
+			s->shutdown=0;
+
+			/* every DTLS ClientHello resets Finished MAC */
+			ssl3_init_finished_mac(s);
+
+			dtls1_start_timer(s);
+			ret=ssl3_client_hello(s);
+			if (ret <= 0) goto end;
+
+			if ( s->d1->send_cookie)
+				{
+				s->state=SSL3_ST_CW_FLUSH;
+				s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
+				}
+			else
+				s->state=SSL3_ST_CR_SRVR_HELLO_A;
+
+			s->init_num=0;
+				/* turn on buffering for the next lot of output */
+				if (s->bbio != s->wbio)
+					s->wbio=BIO_push(s->bbio,s->wbio);
+
+			break;
+
+		case SSL3_ST_CR_SRVR_HELLO_A:
+		case SSL3_ST_CR_SRVR_HELLO_B:
+			ret=ssl3_get_server_hello(s);
+			if (ret <= 0) goto end;
+			else
+				{
+				if (s->hit)
+					{
+					s->state=SSL3_ST_CR_FINISHED_A;
+					}
+				else
+					s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
+				}
+			s->init_num=0;
+			break;
+
+		case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
+		case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
+
+			ret = dtls1_get_hello_verify(s);
+			if ( ret <= 0)
+				goto end;
+			dtls1_stop_timer(s);
+			if ( s->d1->send_cookie) /* start again, with a cookie */
+				s->state=SSL3_ST_CW_CLNT_HELLO_A;
+			else
+				s->state = SSL3_ST_CR_CERT_A;
+			s->init_num = 0;
+			break;
+
+		case SSL3_ST_CR_CERT_A:
+		case SSL3_ST_CR_CERT_B:
+#ifndef OPENSSL_NO_TLSEXT
+			ret=ssl3_check_finished(s);
+			if (ret <= 0) goto end;
+			if (ret == 2)
+				{
+				s->hit = 1;
+				if (s->tlsext_ticket_expected)
+					s->state=SSL3_ST_CR_SESSION_TICKET_A;
+				else
+					s->state=SSL3_ST_CR_FINISHED_A;
+				s->init_num=0;
+				break;
+				}
+#endif
+			/* Check if it is anon DH or PSK */
+			if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
+			    !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
+				{
+				ret=ssl3_get_server_certificate(s);
+				if (ret <= 0) goto end;
+#ifndef OPENSSL_NO_TLSEXT
+				if (s->tlsext_status_expected)
+					s->state=SSL3_ST_CR_CERT_STATUS_A;
+				else
+					s->state=SSL3_ST_CR_KEY_EXCH_A;
+				}
+			else
+				{
+				skip = 1;
+				s->state=SSL3_ST_CR_KEY_EXCH_A;
+				}
+#else
+				}
+			else
+				skip=1;
+
+			s->state=SSL3_ST_CR_KEY_EXCH_A;
+#endif
+			s->init_num=0;
+			break;
+
+		case SSL3_ST_CR_KEY_EXCH_A:
+		case SSL3_ST_CR_KEY_EXCH_B:
+			ret=ssl3_get_key_exchange(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CR_CERT_REQ_A;
+			s->init_num=0;
+
+			/* at this point we check that we have the
+			 * required stuff from the server */
+			if (!ssl3_check_cert_and_algorithm(s))
+				{
+				ret= -1;
+				goto end;
+				}
+			break;
+
+		case SSL3_ST_CR_CERT_REQ_A:
+		case SSL3_ST_CR_CERT_REQ_B:
+			ret=ssl3_get_certificate_request(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CR_SRVR_DONE_A;
+			s->init_num=0;
+			break;
+
+		case SSL3_ST_CR_SRVR_DONE_A:
+		case SSL3_ST_CR_SRVR_DONE_B:
+			ret=ssl3_get_server_done(s);
+			if (ret <= 0) goto end;
+			dtls1_stop_timer(s);
+			if (s->s3->tmp.cert_req)
+				s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
+			else
+				s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
+			s->init_num=0;
+			s->state=s->s3->tmp.next_state;
+			break;
+
+		case SSL3_ST_CW_CERT_A:
+		case SSL3_ST_CW_CERT_B:
+		case SSL3_ST_CW_CERT_C:
+		case SSL3_ST_CW_CERT_D:
+			dtls1_start_timer(s);
+			ret=ssl3_send_client_certificate(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CW_KEY_EXCH_A;
+			s->init_num=0;
+			break;
+
+		case SSL3_ST_CW_KEY_EXCH_A:
+		case SSL3_ST_CW_KEY_EXCH_B:
+			dtls1_start_timer(s);
+			ret=ssl3_send_client_key_exchange(s);
+			if (ret <= 0) goto end;
+
+			/* EAY EAY EAY need to check for DH fix cert
+			 * sent back */
+			/* For TLS, cert_req is set to 2, so a cert chain
+			 * of nothing is sent, but no verify packet is sent */
+			if (s->s3->tmp.cert_req == 1)
+				{
+				s->state=SSL3_ST_CW_CERT_VRFY_A;
+				}
+			else
+				{
+				s->state=SSL3_ST_CW_CHANGE_A;
+				s->s3->change_cipher_spec=0;
+				}
+
+			s->init_num=0;
+			break;
+
+		case SSL3_ST_CW_CERT_VRFY_A:
+		case SSL3_ST_CW_CERT_VRFY_B:
+			dtls1_start_timer(s);
+			ret=ssl3_send_client_verify(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CW_CHANGE_A;
+			s->init_num=0;
+			s->s3->change_cipher_spec=0;
+			break;
+
+		case SSL3_ST_CW_CHANGE_A:
+		case SSL3_ST_CW_CHANGE_B:
+			if (!s->hit)
+				dtls1_start_timer(s);
+			ret=dtls1_send_change_cipher_spec(s,
+				SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
+			if (ret <= 0) goto end;
+
+			s->state=SSL3_ST_CW_FINISHED_A;
+			s->init_num=0;
+
+			s->session->cipher=s->s3->tmp.new_cipher;
+			s->session->compress_meth=0;
+			if (!s->method->ssl3_enc->setup_key_block(s))
+				{
+				ret= -1;
+				goto end;
+				}
+
+			if (!s->method->ssl3_enc->change_cipher_state(s,
+				SSL3_CHANGE_CIPHER_CLIENT_WRITE))
+				{
+				ret= -1;
+				goto end;
+				}
+			
+			dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
+			break;
+
+		case SSL3_ST_CW_FINISHED_A:
+		case SSL3_ST_CW_FINISHED_B:
+			if (!s->hit)
+				dtls1_start_timer(s);
+			ret=ssl3_send_finished(s,
+				SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
+				s->method->ssl3_enc->client_finished_label,
+				s->method->ssl3_enc->client_finished_label_len);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CW_FLUSH;
+
+			/* clear flags */
+			s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
+			if (s->hit)
+				{
+				s->s3->tmp.next_state=SSL_ST_OK;
+				if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
+					{
+					s->state=SSL_ST_OK;
+					s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
+					s->s3->delay_buf_pop_ret=0;
+					}
+				}
+			else
+				{
+
+#ifndef OPENSSL_NO_TLSEXT
+				/* Allow NewSessionTicket if ticket expected */
+				if (s->tlsext_ticket_expected)
+					s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
+				else
+#endif
+				
+				s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
+				}
+			s->init_num=0;
+			break;
+
+#ifndef OPENSSL_NO_TLSEXT
+		case SSL3_ST_CR_SESSION_TICKET_A:
+		case SSL3_ST_CR_SESSION_TICKET_B:
+			ret=ssl3_get_new_session_ticket(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CR_FINISHED_A;
+			s->init_num=0;
+		break;
+
+		case SSL3_ST_CR_CERT_STATUS_A:
+		case SSL3_ST_CR_CERT_STATUS_B:
+			ret=ssl3_get_cert_status(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CR_KEY_EXCH_A;
+			s->init_num=0;
+		break;
+#endif
+
+		case SSL3_ST_CR_FINISHED_A:
+		case SSL3_ST_CR_FINISHED_B:
+			s->d1->change_cipher_spec_ok = 1;
+			ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
+				SSL3_ST_CR_FINISHED_B);
+			if (ret <= 0) goto end;
+			dtls1_stop_timer(s);
+
+			if (s->hit)
+				s->state=SSL3_ST_CW_CHANGE_A;
+			else
+				s->state=SSL_ST_OK;
+
+			s->init_num=0;
+			break;
+
+		case SSL3_ST_CW_FLUSH:
+			s->rwstate=SSL_WRITING;
+			if (BIO_flush(s->wbio) <= 0)
+				{
+				/* If the write error was fatal, stop trying */
+				if (!BIO_should_retry(s->wbio))
+					{
+					s->rwstate=SSL_NOTHING;
+					s->state=s->s3->tmp.next_state;
+					}
+				
+				ret= -1;
+				goto end;
+				}
+			s->rwstate=SSL_NOTHING;
+			s->state=s->s3->tmp.next_state;
+			break;
+
+		case SSL_ST_OK:
+			/* clean a few things up */
+			ssl3_cleanup_key_block(s);
+
+#if 0
+			if (s->init_buf != NULL)
+				{
+				BUF_MEM_free(s->init_buf);
+				s->init_buf=NULL;
+				}
+#endif
+
+			/* If we are not 'joining' the last two packets,
+			 * remove the buffering now */
+			if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
+				ssl_free_wbio_buffer(s);
+			/* else do it later in ssl3_write */
+
+			s->init_num=0;
+			s->renegotiate=0;
+			s->new_session=0;
+
+			ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
+			if (s->hit) s->ctx->stats.sess_hit++;
+
+			ret=1;
+			/* s->server=0; */
+			s->handshake_func=dtls1_connect;
+			s->ctx->stats.sess_connect_good++;
+
+			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
+
+			/* done with handshaking */
+			s->d1->handshake_read_seq  = 0;
+			s->d1->next_handshake_write_seq = 0;
+			goto end;
+			/* break; */
+			
+		default:
+			OPENSSL_PUT_ERROR(SSL, dtls1_connect, SSL_R_UNKNOWN_STATE);
+			ret= -1;
+			goto end;
+			/* break; */
+			}
+
+		/* did we do anything */
+		if (!s->s3->tmp.reuse_message && !skip)
+			{
+			if (s->debug)
+				{
+				if ((ret=BIO_flush(s->wbio)) <= 0)
+					goto end;
+				}
+
+			if ((cb != NULL) && (s->state != state))
+				{
+				new_state=s->state;
+				s->state=state;
+				cb(s,SSL_CB_CONNECT_LOOP,1);
+				s->state=new_state;
+				}
+			}
+		skip=0;
+		}
+end:
+	s->in_handshake--;
+	
+	if (buf != NULL)
+		BUF_MEM_free(buf);
+	if (cb != NULL)
+		cb(s,SSL_CB_CONNECT_EXIT,ret);
+	return(ret);
+	}
+
+static int dtls1_get_hello_verify(SSL *s)
+	{
+	int n, al, ok = 0;
+	unsigned char *data;
+	unsigned int cookie_len;
+
+	s->first_packet = 1;
+	n=s->method->ssl_get_message(s,
+		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
+		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
+		-1,
+		s->max_cert_list,
+		&ok);
+	s->first_packet = 0;
+
+	if (!ok) return((int)n);
+
+	if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
+		{
+		s->d1->send_cookie = 0;
+		s->s3->tmp.reuse_message=1;
+		return(1);
+		}
+
+	data = (unsigned char *)s->init_msg;
+#if 0
+	if (s->method->version != DTLS_ANY_VERSION &&
+		((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))))
+		{
+		OPENSSL_PUT_ERROR(SSL, dtls1_get_hello_verify, SSL_R_WRONG_SSL_VERSION);
+		s->version=(s->version&0xff00)|data[1];
+		al = SSL_AD_PROTOCOL_VERSION;
+		goto f_err;
+		}
+#endif
+	data+=2;
+
+	cookie_len = *(data++);
+	if ( cookie_len > sizeof(s->d1->cookie))
+		{
+		al=SSL_AD_ILLEGAL_PARAMETER;
+		goto f_err;
+		}
+
+	memcpy(s->d1->cookie, data, cookie_len);
+	s->d1->cookie_len = cookie_len;
+
+	s->d1->send_cookie = 1;
+	return 1;
+
+f_err:
+	ssl3_send_alert(s, SSL3_AL_FATAL, al);
+	return -1;
+	}
+