[thirdparty/openssl.git] / ssl / s2_pkt.c

/* 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 n_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;
        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_CTX_size(s->read_hash);
                        if (mac_size < 0)
                                return -1;
                        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 >= (unsigned int)mac_size))
                        {
                        if(!ssl2_enc(s,0))
                                {
                                SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_DECRYPTION_FAILED);
                                return(-1);
                                }
                        s->s2->ract_data_length-=mac_size;
                        ssl2_mac(s,mac,0);
                        s->s2->ract_data_length-=s->s2->padding;
                        if (    (CRYPTO_memcmp(mac,s->s2->mac_data,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=n_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 n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
        {
        unsigned int j,k,olen,p,bs;
        int mac_size;
        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_CTX_size(s->write_hash);
                if (mac_size < 0)
                        return -1;
                }

        /* 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;
                if(ssl2_enc(s,1) < 1)
                        return -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