text: /* ssl/s23_clnt.c */
  /* 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.]
   */
  /* ====================================================================
   * Copyright (c) 1998-2006 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).
   *
   */
  
  #include <stdio.h>
  #include "ssl_locl.h"
  #include <openssl/buffer.h>
  #include <openssl/rand.h>
  #include <openssl/objects.h>
  #include <openssl/evp.h>
  
  static const SSL_METHOD *ssl23_get_client_method(int ver);
  static int ssl23_client_hello(SSL *s);
  static int ssl23_get_server_hello(SSL *s);
  static const SSL_METHOD *ssl23_get_client_method(int ver)
  	{
  #ifndef OPENSSL_NO_SSL2
  	if (ver == SSL2_VERSION)
  		return(SSLv2_client_method());
  #endif
  	if (ver == SSL3_VERSION)
  		return(SSLv3_client_method());
  	else if (ver == TLS1_VERSION)
  		return(TLSv1_client_method());
  	else if (ver == TLS1_1_VERSION)
  		return(TLSv1_1_client_method());
  	else if (ver == TLS1_2_VERSION)
  		return(TLSv1_2_client_method());
  	else
  		return(NULL);
  	}
  
  IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
  			ssl_undefined_function,
  			ssl23_connect,
  			ssl23_get_client_method)
  
  int ssl23_connect(SSL *s)
  	{
  	BUF_MEM *buf=NULL;
  	unsigned long Time=(unsigned long)time(NULL);
  	void (*cb)(const SSL *ssl,int type,int val)=NULL;
  	int ret= -1;
  	int new_state,state;
  
  	RAND_add(&Time,sizeof(Time),0);
  	ERR_clear_error();
  	clear_sys_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); 
  
  	for (;;)
  		{
  		state=s->state;
  
  		switch(s->state)
  			{
  		case SSL_ST_BEFORE:
  		case SSL_ST_CONNECT:
  		case SSL_ST_BEFORE|SSL_ST_CONNECT:
  		case SSL_ST_OK|SSL_ST_CONNECT:
  
  			if (s->session != NULL)
  				{
  				SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
  				ret= -1;
  				goto end;
  				}
  			s->server=0;
  			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
  
  			/* s->version=TLS1_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; }
  
  			ssl3_init_finished_mac(s);
  
  			s->state=SSL23_ST_CW_CLNT_HELLO_A;
  			s->ctx->stats.sess_connect++;
  			s->init_num=0;
  			break;
  
  		case SSL23_ST_CW_CLNT_HELLO_A:
  		case SSL23_ST_CW_CLNT_HELLO_B:
  
  			s->shutdown=0;
  			ret=ssl23_client_hello(s);
  			if (ret <= 0) goto end;
  			s->state=SSL23_ST_CR_SRVR_HELLO_A;
  			s->init_num=0;
  
  			break;
  
  		case SSL23_ST_CR_SRVR_HELLO_A:
  		case SSL23_ST_CR_SRVR_HELLO_B:
  			ret=ssl23_get_server_hello(s);
  			if (ret >= 0) cb=NULL;
  			goto end;
  			/* break; */
  
  		default:
  			SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
  			ret= -1;
  			goto end;
  			/* break; */
  			}
  
  		if (s->debug) { (void)BIO_flush(s->wbio); }
  
  		if ((cb != NULL) && (s->state != state))
  			{
  			new_state=s->state;
  			s->state=state;
  			cb(s,SSL_CB_CONNECT_LOOP,1);
  			s->state=new_state;
  			}
  		}
  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 ssl23_no_ssl2_ciphers(SSL *s)
  	{
  	SSL_CIPHER *cipher;
  	STACK_OF(SSL_CIPHER) *ciphers;
  	int i;
  	ciphers = SSL_get_ciphers(s);
  	for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
  		{
  		cipher = sk_SSL_CIPHER_value(ciphers, i);
  		if (cipher->algorithm_ssl == SSL_SSLV2)
  			return 0;
  		}
  	return 1;
  	}
  
  static int ssl23_client_hello(SSL *s)
  	{
  	unsigned char *buf;
  	unsigned char *p,*d;
  	int i,ch_len;
  	unsigned long Time,l;
  	int ssl2_compat;
  	int version = 0, version_major, version_minor;
  #ifndef OPENSSL_NO_COMP
  	int j;
  	SSL_COMP *comp;
  #endif
  	int ret;
  
  	ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
  
  	if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
  		ssl2_compat = 0;
  #ifndef OPENSSL_NO_TLS1_2_CLIENT
  	if (!(s->options & SSL_OP_NO_TLSv1_2))
  		{
  		version = TLS1_2_VERSION;
  		}
  	else
  #endif
  	if (!(s->options & SSL_OP_NO_TLSv1_1))
  		{
  		version = TLS1_1_VERSION;
  		}
  	else if (!(s->options & SSL_OP_NO_TLSv1))
  		{
  		version = TLS1_VERSION;
  		}
  	else if (!(s->options & SSL_OP_NO_SSLv3))
  		{
  		version = SSL3_VERSION;
  		}
  	else if (!(s->options & SSL_OP_NO_SSLv2))
  		{
  		version = SSL2_VERSION;
  		}
  #ifndef OPENSSL_NO_TLSEXT
  	if (version != SSL2_VERSION)
  		{
  		/* have to disable SSL 2.0 compatibility if we need TLS extensions */
  
  		if (s->tlsext_hostname != NULL)
  			ssl2_compat = 0;
  		if (s->tlsext_status_type != -1)
  			ssl2_compat = 0;
  #ifdef TLSEXT_TYPE_opaque_prf_input
  		if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
  			ssl2_compat = 0;
  #endif
  		}
  #endif
  
  	buf=(unsigned char *)s->init_buf->data;
  	if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
  		{
  #if 0
  		/* don't reuse session-id's */
  		if (!ssl_get_new_session(s,0))
  			{
  			return(-1);
  			}
  #endif
  
  		p=s->s3->client_random;
  		Time=(unsigned long)time(NULL);		/* Time */
  		l2n(Time,p);
  		if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
  			return -1;
  
  		if (version == TLS1_2_VERSION)
  			{
  			version_major = TLS1_2_VERSION_MAJOR;
  			version_minor = TLS1_2_VERSION_MINOR;
  			}
  		else if (version == TLS1_1_VERSION)
  			{
  			version_major = TLS1_1_VERSION_MAJOR;
  			version_minor = TLS1_1_VERSION_MINOR;
  			}
  		else if (version == TLS1_VERSION)
  			{
  			version_major = TLS1_VERSION_MAJOR;
  			version_minor = TLS1_VERSION_MINOR;
  			}
  #ifdef OPENSSL_FIPS
  		else if(FIPS_mode())
  			{
  			SSLerr(SSL_F_SSL23_CLIENT_HELLO,
  					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
  			return -1;
  			}
  #endif
  		else if (version == SSL3_VERSION)
  			{
  			version_major = SSL3_VERSION_MAJOR;
  			version_minor = SSL3_VERSION_MINOR;
  			}
  		else if (version == SSL2_VERSION)
  			{
  			version_major = SSL2_VERSION_MAJOR;
  			version_minor = SSL2_VERSION_MINOR;
  			}
  		else
  			{
  			SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
  			return(-1);
  			}
  
  		s->client_version = version;
  
  		if (ssl2_compat)
  			{
  			/* create SSL 2.0 compatible Client Hello */
  
  			/* two byte record header will be written last */
  			d = &(buf[2]);
  			p = d + 9; /* leave space for message type, version, individual length fields */
  
  			*(d++) = SSL2_MT_CLIENT_HELLO;
  			*(d++) = version_major;
  			*(d++) = version_minor;
  			
  			/* Ciphers supported */
  			i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
  			if (i == 0)
  				{
  				/* no ciphers */
  				SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
  				return -1;
  				}
  			s2n(i,d);
  			p+=i;
  			
  			/* put in the session-id length (zero since there is no reuse) */
  #if 0
  			s->session->session_id_length=0;
  #endif
  			s2n(0,d);
  
  			if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
  				ch_len=SSL2_CHALLENGE_LENGTH;
  			else
  				ch_len=SSL2_MAX_CHALLENGE_LENGTH;
  
  			/* write out sslv2 challenge */
  			/* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
  			   because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
  			   or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
  			   check in for futurproofing */
  			if (SSL3_RANDOM_SIZE < ch_len)
  				i=SSL3_RANDOM_SIZE;
  			else
  				i=ch_len;
  			s2n(i,d);
  			memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
  			if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
  				return -1;
  
  			memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
  			p+=i;
  
  			i= p- &(buf[2]);
  			buf[0]=((i>>8)&0xff)|0x80;
  			buf[1]=(i&0xff);
  
  			/* number of bytes to write */
  			s->init_num=i+2;
  			s->init_off=0;
  
  			ssl3_finish_mac(s,&(buf[2]),i);
  			}
  		else
  			{
  			/* create Client Hello in SSL 3.0/TLS 1.0 format */
  
  			/* do the record header (5 bytes) and handshake message header (4 bytes) last */
  			d = p = &(buf[9]);
  			
  			*(p++) = version_major;
  			*(p++) = version_minor;
  
  			/* Random stuff */
  			memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
  			p += SSL3_RANDOM_SIZE;
  
  			/* Session ID (zero since there is no reuse) */
  			*(p++) = 0;
  
  			/* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
  			i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
  			if (i == 0)
  				{
  				SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
  				return -1;
  				}
  #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
  			/* Some servers hang if client hello > 256 bytes
  			 * as hack workaround chop number of supported ciphers
  			 * to keep it well below this if we use TLS v1.2
  			 */
  			if (TLS1_get_version(s) >= TLS1_2_VERSION
  				&& i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
  				i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
  #endif
  			s2n(i,p);
  			p+=i;
  
  			/* COMPRESSION */
  #ifdef OPENSSL_NO_COMP
  			*(p++)=1;
  #else
  			if ((s->options & SSL_OP_NO_COMPRESSION)
  						|| !s->ctx->comp_methods)
  				j=0;
  			else
  				j=sk_SSL_COMP_num(s->ctx->comp_methods);
  			*(p++)=1+j;
  			for (i=0; i<j; i++)
  				{
  				comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
  				*(p++)=comp->id;
  				}
  #endif
  			*(p++)=0; /* Add the NULL method */
  
  #ifndef OPENSSL_NO_TLSEXT
  			/* TLS extensions*/
  			if (ssl_prepare_clienthello_tlsext(s) <= 0)
  				{
  				SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
  				return -1;
  				}
  			if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
  				{
  				SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
  				return -1;
  				}
  #endif
  			
  			l = p-d;
  
  			/* fill in 4-byte handshake header */
  			d=&(buf[5]);
  			*(d++)=SSL3_MT_CLIENT_HELLO;
  			l2n3(l,d);
  
  			l += 4;
  
  			if (l > SSL3_RT_MAX_PLAIN_LENGTH)
  				{
  				SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
  				return -1;
  				}
  			
  			/* fill in 5-byte record header */
  			d=buf;
  			*(d++) = SSL3_RT_HANDSHAKE;
  			*(d++) = version_major;
  			/* Some servers hang if we use long client hellos
  			 * and a record number > TLS 1.0.
  			 */
  			if (TLS1_get_client_version(s) > TLS1_VERSION)
  				*(d++) = 1;
  			else
  				*(d++) = version_minor;
  			s2n((int)l,d);
  
  			/* number of bytes to write */
  			s->init_num=p-buf;
  			s->init_off=0;
  
  			ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
  			}
  
  		s->state=SSL23_ST_CW_CLNT_HELLO_B;
  		s->init_off=0;
  		}
  
  	/* SSL3_ST_CW_CLNT_HELLO_B */
  	ret = ssl23_write_bytes(s);
  
  	if ((ret >= 2) && s->msg_callback)
  		{
  		/* Client Hello has been sent; tell msg_callback */
  
  		if (ssl2_compat)
  			s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
  		else
  			s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
  		}
  
  	return ret;
  	}
  
  static int ssl23_get_server_hello(SSL *s)
  	{
  	char buf[8];
  	unsigned char *p;
  	int i;
  	int n;
  
  	n=ssl23_read_bytes(s,7);
  
  	if (n != 7) return(n);
  	p=s->packet;
  
  	memcpy(buf,p,n);
  
  	if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
  		(p[5] == 0x00) && (p[6] == 0x02))
  		{
  #ifdef OPENSSL_NO_SSL2
  		SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
  		goto err;
  #else
  		/* we are talking sslv2 */
  		/* we need to clean up the SSLv3 setup and put in the
  		 * sslv2 stuff. */
  		int ch_len;
  
  		if (s->options & SSL_OP_NO_SSLv2)
  			{
  			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
  			goto err;
  			}
  		if (s->s2 == NULL)
  			{
  			if (!ssl2_new(s))
  				goto err;
  			}
  		else
  			ssl2_clear(s);
  
  		if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
  			ch_len=SSL2_CHALLENGE_LENGTH;
  		else
  			ch_len=SSL2_MAX_CHALLENGE_LENGTH;
  
  		/* write out sslv2 challenge */
  		/* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
  		   it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
  		   SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
  		   futurproofing */
  		i=(SSL3_RANDOM_SIZE < ch_len)
  			?SSL3_RANDOM_SIZE:ch_len;
  		s->s2->challenge_length=i;
  		memcpy(s->s2->challenge,
  			&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
  
  		if (s->s3 != NULL) ssl3_free(s);
  
  		if (!BUF_MEM_grow_clean(s->init_buf,
  			SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
  			{
  			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
  			goto err;
  			}
  
  		s->state=SSL2_ST_GET_SERVER_HELLO_A;
  		if (!(s->client_version == SSL2_VERSION))
  			/* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
  			s->s2->ssl2_rollback=1;
  
  		/* setup the 7 bytes we have read so we get them from
  		 * the sslv2 buffer */
  		s->rstate=SSL_ST_READ_HEADER;
  		s->packet_length=n;
  		s->packet= &(s->s2->rbuf[0]);
  		memcpy(s->packet,buf,n);
  		s->s2->rbuf_left=n;
  		s->s2->rbuf_offs=0;
  
  		/* we have already written one */
  		s->s2->write_sequence=1;
  
  		s->method=SSLv2_client_method();
  		s->handshake_func=s->method->ssl_connect;
  #endif
  		}
  	else if (p[1] == SSL3_VERSION_MAJOR &&
  	         p[2] <= TLS1_2_VERSION_MINOR &&
  	         ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
  	          (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
  		{
  		/* we have sslv3 or tls1 (server hello or alert) */
  
  		if ((p[2] == SSL3_VERSION_MINOR) &&
  			!(s->options & SSL_OP_NO_SSLv3))
  			{
  #ifdef OPENSSL_FIPS
  			if(FIPS_mode())
  				{
  				SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
  					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
  				goto err;
  				}
  #endif
  			s->version=SSL3_VERSION;
  			s->method=SSLv3_client_method();
  			}
  		else if ((p[2] == TLS1_VERSION_MINOR) &&
  			!(s->options & SSL_OP_NO_TLSv1))
  			{
  			s->version=TLS1_VERSION;
  			s->method=TLSv1_client_method();
  			}
  		else if ((p[2] == TLS1_1_VERSION_MINOR) &&
  			!(s->options & SSL_OP_NO_TLSv1_1))
  			{
  			s->version=TLS1_1_VERSION;
  			s->method=TLSv1_1_client_method();
  			}
  		else if ((p[2] == TLS1_2_VERSION_MINOR) &&
  			!(s->options & SSL_OP_NO_TLSv1_2))
  			{
  			s->version=TLS1_2_VERSION;
  			s->method=TLSv1_2_client_method();
  			}
  		else
  			{
  			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
  			goto err;
  			}
  
  		if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
  			{
  			/* fatal alert */
  
  			void (*cb)(const SSL *ssl,int type,int val)=NULL;
  			int j;
  
  			if (s->info_callback != NULL)
  				cb=s->info_callback;
  			else if (s->ctx->info_callback != NULL)
  				cb=s->ctx->info_callback;
   
  			i=p[5];
  			if (cb != NULL)
  				{
  				j=(i<<8)|p[6];
  				cb(s,SSL_CB_READ_ALERT,j);
  				}
  			
  			if (s->msg_callback)
  				s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
  
  			s->rwstate=SSL_NOTHING;
  			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
  			goto err;
  			}
  
  		if (!ssl_init_wbio_buffer(s,1)) goto err;
  
  		/* we are in this state */
  		s->state=SSL3_ST_CR_SRVR_HELLO_A;
  
  		/* put the 7 bytes we have read into the input buffer
  		 * for SSLv3 */
  		s->rstate=SSL_ST_READ_HEADER;
  		s->packet_length=n;
  		if (s->s3->rbuf.buf == NULL)
  			if (!ssl3_setup_read_buffer(s))
  				goto err;
  		s->packet= &(s->s3->rbuf.buf[0]);
  		memcpy(s->packet,buf,n);
  		s->s3->rbuf.left=n;
  		s->s3->rbuf.offset=0;
  
  		s->handshake_func=s->method->ssl_connect;
  		}
  	else
  		{
  		SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
  		goto err;
  		}
  	s->init_num=0;
  
  	/* Since, if we are sending a ssl23 client hello, we are not
  	 * reusing a session-id */
  	if (!ssl_get_new_session(s,0))
  		goto err;
  
  	return(SSL_connect(s));
  err:
  	return(-1);
  	}
  