/* ssl/s3_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.]
*/
#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include <openssl/evp.h>
#include <openssl/buffer.h>
#include "ssl_locl.h"
static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
unsigned int len);
static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
unsigned int len);
static int ssl3_get_record(SSL *s);
static int do_compress(SSL *ssl);
static int do_uncompress(SSL *ssl);
static int do_change_cipher_spec(SSL *ssl);
static int ssl3_read_n(SSL *s, int n, int max, 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->s3->rbuf.left >= (int)n)
{
if (extend)
s->packet_length+=n;
else
{
s->packet= &(s->s3->rbuf.buf[s->s3->rbuf.offset]);
s->packet_length=n;
}
s->s3->rbuf.left-=n;
s->s3->rbuf.offset+=n;
return(n);
}
/* else we need to read more data */
if (!s->read_ahead) max=n;
if (max > SSL3_RT_MAX_PACKET_SIZE)
max=SSL3_RT_MAX_PACKET_SIZE;
/* First check if there is some left or we want to extend */
off=0;
if ( (s->s3->rbuf.left != 0) ||
((s->packet_length != 0) && extend))
{
newb=s->s3->rbuf.left;
if (extend)
{
/* Copy bytes back to the front of the buffer
* Take the bytes already pointed to by 'packet'
* and take the extra ones on the end. */
off=s->packet_length;
if (s->packet != s->s3->rbuf.buf)
memcpy(s->s3->rbuf.buf,s->packet,newb+off);
}
else if (s->s3->rbuf.offset != 0)
{ /* so the data is not at the start of the buffer */
memcpy(s->s3->rbuf.buf,
&(s->s3->rbuf.buf[s->s3->rbuf.offset]),newb);
s->s3->rbuf.offset=0;
}
s->s3->rbuf.left=0;
}
else
newb=0;
/* So we now have 'newb' bytes at the front of
* s->s3->rbuf.buf and need to read some more in on the end
* We start reading into the buffer at 's->s3->rbuf.offset'
*/
s->packet=s->s3->rbuf.buf;
while (newb < n)
{
clear_sys_error();
if (s->rbio != NULL)
{
s->rwstate=SSL_READING;
i=BIO_read(s->