/* ssl/s2_pkt.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) 1998-2001 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 "ssl_locl.h"

 #ifndef OPENSSL_NO_SSL2

 #include <stdio.h>

 #include <errno.h>

 #define USE_SOCKETS

 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);

 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);

 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);

 static int ssl_mt_error(int n);

 /* SSL 2.0 imlementation for SSL_read/SSL_peek -

  * This routine will return 0 to len bytes, decrypted etc if required.

  */

 static int ssl2_read_internal(SSL *s, void *buf, int len, int peek)

 	{

 	int n;

 	unsigned char mac[MAX_MAC_SIZE];

 	unsigned char *p;

 	int i;

 	unsigned int mac_size;

  ssl2_read_again:

 	if (SSL_in_init(s) && !s->in_handshake)

 		{

 		n=s->handshake_func(s);

 		if (n < 0) return(n);

 		if (n == 0)

 			{

 			SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE);

 			return(-1);

 			}

 		}

 	clear_sys_error();

 	s->rwstate=SSL_NOTHING;

 	if (len <= 0) return(len);

 	if (s->s2->ract_data_length != 0) /* read from buffer */

 		{

 		if (len > s->s2->ract_data_length)

 			n=s->s2->ract_data_length;

 		else

 			n=len;

 		memcpy(buf,s->s2->ract_data,(unsigned int)n);

 		if (!peek)

 			{

 			s->s2->ract_data_length-=n;

 			s->s2->ract_data+=n;

 			if (s->s2->ract_data_length == 0)

 				s->rstate=SSL_ST_READ_HEADER;

 			}

 		return(n);

 		}

 	/* s->s2->ract_data_length == 0

 	 * 

 	 * Fill the buffer, then goto ssl2_read_again.

 	 */

 	if (s->rstate == SSL_ST_READ_HEADER)

 		{

 		if (s->first_packet)

 			{

 			n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);

 			if (n <= 0) return(n); /* error or non-blocking */

 			s->first_packet=0;

 			p=s->packet;

 			if (!((p[0] & 0x80) && (

 				(p[2] == SSL2_MT_CLIENT_HELLO) ||

 				(p[2] == SSL2_MT_SERVER_HELLO))))

 				{

 				SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET);

 				return(-1);

 				}

 			}

 		else

 			{

 			n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);

 			if (n <= 0) return(n); /* error or non-blocking */

 			}

 		/* part read stuff */

 		s->rstate=SSL_ST_READ_BODY;

 		p=s->packet;

 		/* Do header */

 		/*s->s2->padding=0;*/

 		s->s2->escape=0;

 		s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);

 		if ((p[0] & TWO_BYTE_BIT))		/* Two byte header? */

 			{

 			s->s2->three_byte_header=0;

 			s->s2->rlength&=TWO_BYTE_MASK;	

 			}

 		else

 			{

 			s->s2->three_byte_header=1;

 			s->s2->rlength&=THREE_BYTE_MASK;

 			/* security >s2->escape */

 			s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;

 			}

 		}

 	if (s->rstate == SSL_ST_READ_BODY)

 		{

 		n=s->s2->rlength+2+s->s2->three_byte_header;

 		if (n > (int)s->packet_length)

 			{

 			n-=s->packet_length;

 			i=read_n(s,(unsigned int)n,(unsigned int)n,1);

 			if (i <= 0) return(i); /* ERROR */

 			}

 		p= &(s->packet[2]);

 		s->rstate=SSL_ST_READ_HEADER;

 		if (s->s2->three_byte_header)

 			s->s2->padding= *(p++);

 		else	s->s2->padding=0;

 		/* Data portion */

 		if (s->s2->clear_text)

 			{

 			mac_size = 0;

 			s->s2->mac_data=p;

 			s->s2->ract_data=p;

 			if (s->s2->padding)

 				{

 				SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);

 				return(-1);

 				}

 			}

 		else

 			{

 			mac_size=EVP_MD_size(s->read_hash);

 			OPENSSL_assert(mac_size <= MAX_MAC_SIZE);

 			s->s2->mac_data=p;

 			s->s2->ract_data= &p[mac_size];

 			if (s->s2->padding + mac_size > s->s2->rlength)

 				{

 				SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);

 				return(-1);

 				}

 			}

 		s->s2->ract_data_length=s->s2->rlength;

 		/* added a check for length > max_size in case

 		 * encryption was not turned on yet due to an error */

 		if ((!s->s2->clear_text) &&

 			(s->s2->rlength >= mac_size))

 			{

 			ssl2_enc(s,0);

 			s->s2->ract_data_length-=mac_size;

 			ssl2_mac(s,mac,0);

 			s->s2->ract_data_length-=s->s2->padding;

 			if (	(memcmp(mac,s->s2->mac_data,

 				(unsigned int)mac_size) != 0) ||

 				(s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))

 				{

 				SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);

 				return(-1);

 				}

 			}

 		INC32(s->s2->read_sequence); /* expect next number */

 		/* s->s2->ract_data is now available for processing */

 		/* Possibly the packet that we just read had 0 actual data bytes.

 		 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)

 		 * In this case, returning 0 would be interpreted by the caller

 		 * as indicating EOF, so it's not a good idea.  Instead, we just

 		 * continue reading; thus ssl2_read_internal may have to process

 		 * multiple packets before it can return.

 		 *

 		 * [Note that using select() for blocking sockets *never* guarantees

 		 * that the next SSL_read will not block -- the available

 		 * data may contain incomplete packets, and except for SSL 2,

 		 * renegotiation can confuse things even more.] */

 		goto ssl2_read_again; /* This should really be

 		                       * "return ssl2_read(s,buf,len)",

 		                       * but that would allow for

 		                       * denial-of-service attacks if a

 		                       * C compiler is used that does not

 		                       * recognize end-recursion. */

 		}

 	else

 		{

 		SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);

 			return(-1);

 		}

 	}

 int ssl2_read(SSL *s, void *buf, int len)

 	{

 	return ssl2_read_internal(s, buf, len, 0);

 	}

 int ssl2_peek(SSL *s, void *buf, int len)

 	{

 	return ssl2_read_internal(s, buf, len, 1);

 	}

 static int read_n(SSL *s, unsigned int n, unsigned int max,

 	     unsigned int extend)

 	{

 	int i,off,newb;

 	/* if there is stuff still in the buffer from a previous read,

 	 * and there is more than we want, take some. */

 	if (s->s2->rbuf_left >= (int)n)

 		{

 		if (extend)

 			s->packet_length+=n;

 		else

 			{

 			s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);

 			s->packet_length=n;

 			}

 		s->s2->rbuf_left-=n;

 		s->s2->rbuf_offs+=n;

 		return(n);

 		}

 	if (!s->read_ahead) max=n;

 	if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))

 		max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;

 	/* Else we want more than we have.

 	 * First, if there is some left or we want to extend */

 	off=0;

 	if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))

 		{

 		newb=s->s2->rbuf_left;

 		if (extend)

 			{

 			off=s->packet_length;

 			if (s->packet != s->s2->rbuf)

 				memcpy(s->s2->rbuf,s->packet,

 					(unsigned int)newb+off);

 			}

 		else if (s->s2->rbuf_offs != 0)

 			{

 			memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),

 				(unsigned int)newb);

 			s->s2->rbuf_offs=0;

 			}

 		s->s2->rbuf_left=0;

 		}

 	else

 		newb=0;

 	/* off is the offset to start writing too.

 	 * r->s2->rbuf_offs is the 'unread data', now 0. 

 	 * newb is the number of new bytes so far

 	 */

 	s->packet=s->s2->rbuf;

 	while (newb < (int)n)

 		{

 		clear_sys_error();

 		if (s->rbio != NULL)

 			{

 			s->rwstate=SSL_READING;

 			i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),

 				max-newb);

 			}

 		else

 			{

 			SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);

 			i= -1;

 			}

 #ifdef PKT_DEBUG

 		if (s->debug & 0x01) sleep(1);

 #endif

 		if (i <= 0)

 			{

 			s->s2->rbuf_left+=newb;

 			return(i);

 			}

 		newb+=i;

 		}

 	/* record unread data */

 	if (newb > (int)n)

 		{

 		s->s2->rbuf_offs=n+off;

 		s->s2->rbuf_left=newb-n;

 		}

 	else

 		{

 		s->s2->rbuf_offs=0;

 		s->s2->rbuf_left=0;

 		}

 	if (extend)

 		s->packet_length+=n;

 	else

 		s->packet_length=n;

 	s->rwstate=SSL_NOTHING;

 	return(n);

 	}

 int ssl2_write(SSL *s, const void *_buf, int len)

 	{

 	const unsigned char *buf=_buf;

 	unsigned int n,tot;

 	int i;

 	if (SSL_in_init(s) && !s->in_handshake)

 		{

 		i=s->handshake_func(s);

 		if (i < 0) return(i);

 		if (i == 0)

 			{

 			SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);

 			return(-1);

 			}

 		}

 	if (s->error)

 		{

 		ssl2_write_error(s);

 		if (s->error)

 			return(-1);

 		}

 	clear_sys_error();

 	s->rwstate=SSL_NOTHING;

 	if (len <= 0) return(len);

 	tot=s->s2->wnum;

 	s->s2->wnum=0;

 	n=(len-tot);

 	for (;;)

 		{

 		i=do_ssl_write(s,&(buf[tot]),n);

 		if (i <= 0)

 			{

 			s->s2->wnum=tot;

 			return(i);

 			}

 		if ((i == (int)n) ||

 			(s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))

 			{

 			return(tot+i);

 			}

 		n-=i;

 		tot+=i;

 		}

 	}

 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)

 	{

 	int i;

 	/* s->s2->wpend_len != 0 MUST be true. */

 	/* check that they have given us the same buffer to

 	 * write */

 	if ((s->s2->wpend_tot > (int)len) ||

 		((s->s2->wpend_buf != buf) &&

 		 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))

 		{

 		SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);

 		return(-1);

 		}

 	for (;;)

 		{

 		clear_sys_error();

 		if (s->wbio != NULL)

 			{

 			s->rwstate=SSL_WRITING;

 			i=BIO_write(s->wbio,

 				(char *)&(s->s2->write_ptr[s->s2->wpend_off]),

 				(unsigned int)s->s2->wpend_len);

 			}

 		else

 			{

 			SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);

 			i= -1;

 			}

 #ifdef PKT_DEBUG

 		if (s->debug & 0x01) sleep(1);

 #endif

 		if (i == s->s2->wpend_len)

 			{

 			s->s2->wpend_len=0;

 			s->rwstate=SSL_NOTHING;

 			return(s->s2->wpend_ret);

 			}

 		else if (i <= 0)

 			return(i);

 		s->s2->wpend_off+=i;

 		s->s2->wpend_len-=i;

 		}

 	}

 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)

 	{

 	unsigned int j,k,olen,p,mac_size,bs;

 	register unsigned char *pp;

 	olen=len;

 	/* first check if there is data from an encryption waiting to

 	 * be sent - it must be sent because the other end is waiting.

 	 * This will happen with non-blocking IO.  We print it and then

 	 * return.

 	 */

 	if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));

 	/* set mac_size to mac size */

 	if (s->s2->clear_text)

 		mac_size=0;

 	else

 		mac_size=EVP_MD_size(s->write_hash);

 	/* lets set the pad p */

 	if (s->s2->clear_text)

 		{

 		if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)

 			len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;

 		p=0;

 		s->s2->three_byte_header=0;

 		/* len=len; */

 		}

 	else

 		{

 		bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);

 		j=len+mac_size;

 		/* Two-byte headers allow for a larger record length than

 		 * three-byte headers, but we can't use them if we need

 		 * padding or if we have to set the escape bit. */

 		if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&

 			(!s->s2->escape))

 			{

 			if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)

 				j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;

 			/* set k to the max number of bytes with 2

 			 * byte header */

 			k=j-(j%bs);

 			/* how many data bytes? */

 			len=k-mac_size; 

 			s->s2->three_byte_header=0;

 			p=0;

 			}

 		else if ((bs <= 1) && (!s->s2->escape))

 			{

 			/* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus

 			 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */

 			s->s2->three_byte_header=0;

 			p=0;

 			}

 		else /* we may have to use a 3 byte header */

 			{

 			/* If s->s2->escape is not set, then

 			 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus

 			 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */

 			p=(j%bs);

 			p=(p == 0)?0:(bs-p);

 			if (s->s2->escape)

 				{

 				s->s2->three_byte_header=1;

 				if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

 					j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;

 				}

 			else

 				s->s2->three_byte_header=(p == 0)?0:1;

 			}

 		}

 	/* Now

 	 *      j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER

 	 * holds, and if s->s2->three_byte_header is set, then even

 	 *      j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.

 	 */

 	/* mac_size is the number of MAC bytes

 	 * len is the number of data bytes we are going to send

 	 * p is the number of padding bytes

 	 * (if it is a two-byte header, then p == 0) */

 	s->s2->wlength=len;

 	s->s2->padding=p;

 	s->s2->mac_data= &(s->s2->wbuf[3]);

 	s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);

 	/* we copy the data into s->s2->wbuf */

 	memcpy(s->s2->wact_data,buf,len);

 	if (p)

 		memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */

 	if (!s->s2->clear_text)

 		{

 		s->s2->wact_data_length=len+p;

 		ssl2_mac(s,s->s2->mac_data,1);

 		s->s2->wlength+=p+mac_size;

 		ssl2_enc(s,1);

 		}

 	/* package up the header */

 	s->s2->wpend_len=s->s2->wlength;

 	if (s->s2->three_byte_header) /* 3 byte header */

 		{

 		pp=s->s2->mac_data;

 		pp-=3;

 		pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);

 		if (s->s2->escape) pp[0]|=SEC_ESC_BIT;

 		pp[1]=s->s2->wlength&0xff;

 		pp[2]=s->s2->padding;

 		s->s2->wpend_len+=3;

 		}

 	else

 		{

 		pp=s->s2->mac_data;

 		pp-=2;

 		pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;

 		pp[1]=s->s2->wlength&0xff;

 		s->s2->wpend_len+=2;

 		}

 	s->s2->write_ptr=pp;

 	INC32(s->s2->write_sequence); /* expect next number */

 	/* lets try to actually write the data */

 	s->s2->wpend_tot=olen;

 	s->s2->wpend_buf=buf;

 	s->s2->wpend_ret=len;

 	s->s2->wpend_off=0;

 	return(write_pending(s,buf,olen));

 	}

 int ssl2_part_read(SSL *s, unsigned long f, int i)

 	{

 	unsigned char *p;

 	int j;

 	if (i < 0)

 		{

 		/* ssl2_return_error(s); */

 		/* for non-blocking io,

 		 * this is not necessarily fatal */

 		return(i);

 		}

 	else

 		{

 		s->init_num+=i;

 		/* Check for error.  While there are recoverable errors,

 		 * this function is not called when those must be expected;

 		 * any error detected here is fatal. */

 		if (s->init_num >= 3)

 			{

 			p=(unsigned char *)s->init_buf->data;

 			if (p[0] == SSL2_MT_ERROR)

 				{

 				j=(p[1]<<8)|p[2];

 				SSLerr((int)f,ssl_mt_error(j));

 				s->init_num -= 3;

 				if (s->init_num > 0)

 					memmove(p, p+3, s->init_num);

 				}

 			}

 		/* If it's not an error message, we have some error anyway --

 		 * the message was shorter than expected.  This too is treated

 		 * as fatal (at least if SSL_get_error is asked for its opinion). */

 		return(0);

 		}

 	}

 int ssl2_do_write(SSL *s)

 	{

 	int ret;

 	ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);

 	if (ret == s->init_num)

 		{

 		if (s->msg_callback)

 			s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);

 		return(1);

 		}

 	if (ret < 0)

 		return(-1);

 	s->init_off+=ret;

 	s->init_num-=ret;

 	return(0);

 	}

 static int ssl_mt_error(int n)

 	{

 	int ret;

 	switch (n)

 		{

 	case SSL2_PE_NO_CIPHER:

 		ret=SSL_R_PEER_ERROR_NO_CIPHER;

 		break;

 	case SSL2_PE_NO_CERTIFICATE:

 		ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;

 		break;

 	case SSL2_PE_BAD_CERTIFICATE:

 		ret=SSL_R_PEER_ERROR_CERTIFICATE;

 		break;

 	case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:

 		ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;

 		break;

 	default:

 		ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;

 		break;

 		}

 	return(ret);

 	}

 #else /* !OPENSSL_NO_SSL2 */

 # if PEDANTIC

 static void *dummy=&dummy;

 # endif

 #endif