s2_pkt.c

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/* ssl/s2_pkt.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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
 *    [email protected].
 *
 * 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
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#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))
            {
            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=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;
        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