* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
+/* ====================================================================
+ * Copyright (c) 1998-1999 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 <errno.h>
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)
{
+ /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
+ * packet by another n bytes.
+ * The packet will be in the sub-array of s->s3->rbuf.buf specified
+ * by s->packet and s->packet_length.
+ * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
+ * [plus s->packet_length bytes if extend == 1].)
+ */
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 (!extend)
+ {
+ /* start with empty packet ... */
+ if (s->s3->rbuf.left == 0)
+ s->s3->rbuf.offset = 0;
+ s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
+ s->packet_length = 0;
+ /* ... now we can act as if 'extend' was set */
+ }
+
+ /* if there is enough in the buffer from a previous read, 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->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;
- }
+ if (!s->read_ahead)
+ max=n;
- s->s3->rbuf.left=0;
+ {
+ /* avoid buffer overflow */
+ int max_max = SSL3_RT_MAX_PACKET_SIZE - s->packet_length;
+ if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
+ max_max += SSL3_RT_MAX_EXTRA;
+ if (max > max_max)
+ max = max_max;
+ }
+ if (n > max) /* does not happen */
+ {
+ SSLerr(SSL_F_SSL3_READ_N,SSL_R_INTERNAL_ERROR);
+ return -1;
}
- 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;
+ off = s->packet_length;
+ newb = s->s3->rbuf.left;
+ /* Move any available bytes to front of buffer:
+ * 'off' bytes already pointed to by 'packet',
+ * 'newb' extra ones at the end */
+ if (s->packet != s->s3->rbuf.buf)
+ {
+ /* off > 0 */
+ memmove(s->s3->rbuf.buf, s->packet, off+newb);
+ s->packet = s->s3->rbuf.buf;
+ }
+
while (newb < n)
{
+ /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
+ * to read in more until we have off+n (up to off+max if possible) */
+
clear_sys_error();
if (s->rbio != NULL)
{
s->rwstate=SSL_READING;
- i=BIO_read(s->rbio,
- (char *)&(s->s3->rbuf.buf[off+newb]),
- max-newb);
+ i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb);
}
else
{
SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
- i= -1;
+ i = -1;
}
if (i <= 0)
{
- s->s3->rbuf.left+=newb;
+ s->s3->rbuf.left = newb;
return(i);
}
newb+=i;
}
- /* record used data read */
- if (newb > n)
- {
- s->s3->rbuf.offset=n+off;
- s->s3->rbuf.left=newb-n;
- }
- else
- {
- s->s3->rbuf.offset=0;
- s->s3->rbuf.left=0;
- }
-
- if (extend)
- s->packet_length+=n;
- else
- s->packet_length+=n;
+ /* done reading, now the book-keeping */
+ s->s3->rbuf.offset = off + n;
+ s->s3->rbuf.left = newb - n;
+ s->packet_length += n;
+ s->rwstate=SSL_NOTHING;
return(n);
}
* It will return <= 0 if more data is needed, normally due to an error
* or non-blocking IO.
* When it finishes, one packet has been decoded and can be found in
- * ssl->s3->rrec.type - is the type of record
- * ssl->s3->rrec.data, - data
+ * ssl->s3->rrec.type - is the type of record
+ * ssl->s3->rrec.data, - data
* ssl->s3->rrec.length, - number of bytes
*/
static int ssl3_get_record(SSL *s)
goto f_err;
}
- s->rstate=SSL_ST_READ_BODY;
+ /* now s->rstate == SSL_ST_READ_BODY; */
}
/* get and decode the data */
if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
{
i=rr->length;
- /*-(s->packet_length-SSL3_RT_HEADER_LENGTH); */
n=ssl3_read_n(s,i,i,1);
if (n <= 0) return(n); /* error or non-blocking io */
}
void (*cb)()=NULL;
BIO *bio;
- if (s->s3->rbuf.buf == NULL) /* Not initialize yet */
+ if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
if (!ssl3_setup_buffers(s))
return(-1);
start:
s->rwstate=SSL_NOTHING;
- /* s->s3->rrec.type - is the type of record
- * s->s3->rrec.data, - data
- * s->s3->rrec.off, - ofset into 'data' for next read
- * s->s3->rrec.length, - number of bytes. */
+ /* s->s3->rrec.type - is the type of record
+ * s->s3->rrec.data, - data
+ * s->s3->rrec.off, - offset into 'data' for next read
+ * s->s3->rrec.length, - number of bytes. */
rr= &(s->s3->rrec);
/* get new packet */
return(0);
}
- /* Check for an incoming 'Client Request' message */
+ /* Check for an incoming 'Hello Request' message from client */
if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
- (rr->data[0] == SSL3_MT_CLIENT_REQUEST) &&
+ (rr->data[0] == SSL3_MT_HELLO_REQUEST) &&
(s->session != NULL) && (s->session->cipher != NULL))
{
if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
(rr->data[3] != 0))
{
al=SSL_AD_DECODE_ERROR;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CLIENT_REQUEST);
+ SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
goto err;
}
}
return(i);
}
-
projects / openssl.git / blobdiff