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/*
* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "../ssl_local.h"
#include "record_local.h"
void SSL3_BUFFER_set_data(SSL3_BUFFER *b, const unsigned char *d, size_t n)
{
if (d != NULL)
memcpy(b->buf, d, n);
b->left = n;
b->offset = 0;
}
/*
* Clear the contents of an SSL3_BUFFER but retain any memory allocated. Also
* retains the default_len setting
*/
void SSL3_BUFFER_clear(SSL3_BUFFER *b)
{
b->offset = 0;
b->left = 0;
}
void SSL3_BUFFER_release(SSL3_BUFFER *b)
{
OPENSSL_free(b->buf);
b->buf = NULL;
}
int ssl3_setup_read_buffer(SSL *s)
{
unsigned char *p;
size_t len, align = 0, headerlen;
SSL3_BUFFER *b;
b = RECORD_LAYER_get_rbuf(&s->rlayer);
if (SSL_IS_DTLS(s))
headerlen = DTLS1_RT_HEADER_LENGTH;
else
headerlen = SSL3_RT_HEADER_LENGTH;
#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
#endif
if (b->buf == NULL) {
len = SSL3_RT_MAX_PLAIN_LENGTH
+ SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
#ifndef OPENSSL_NO_COMP
if (ssl_allow_compression(s))
len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
#endif
if (b->default_len > len)
len = b->default_len;
if ((p = OPENSSL_malloc(len)) == NULL) {
/*
* We've got a malloc failure, and we're still initialising buffers.
* We assume we're so doomed that we won't even be able to send an
* alert.
*/
SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_SSL3_SETUP_READ_BUFFER,
ERR_R_MALLOC_FAILURE);
return 0;
}
b->buf = p;
b->len = len;
}
return 1;
}
int ssl3_setup_write_buffer(SSL *s, size_t numwpipes, size_t len)
{
unsigned char *p;
size_t align = 0, headerlen;
SSL3_BUFFER *wb;
size_t currpipe;
s->rlayer.numwpipes = numwpipes;
if (len == 0) {
if (SSL_IS_DTLS(s))
headerlen = DTLS1_RT_HEADER_LENGTH + 1;
else
headerlen = SSL3_RT_HEADER_LENGTH;
#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
align = SSL3_ALIGN_PAYLOAD - 1;
#endif
len = ssl_get_max_send_fragment(s)
+ SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align
+ SSL_RT_MAX_CIPHER_BLOCK_SIZE /* Explicit IV allowance */;
#ifndef OPENSSL_NO_COMP
if (ssl_allow_compression(s))
len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
#endif
/*
* We don't need to add an allowance for eivlen here since empty
* fragments only occur when we don't have an explicit IV
*/
if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
}
wb = RECORD_LAYER_get_wbuf(&s->rlayer);
for (currpipe = 0; currpipe < numwpipes; currpipe++) {
SSL3_BUFFER *thiswb = &wb[currpipe];
if (thiswb->buf != NULL && thiswb->len != len) {
OPENSSL_free(thiswb->buf);
thiswb->buf = NULL; /* force reallocation */
}
if (thiswb->buf == NULL) {
p = OPENSSL_malloc(len);
if (p == NULL) {
s->rlayer.numwpipes = currpipe;
/*
* We've got a malloc failure, and we're still initialising
* buffers. We assume we're so doomed that we won't even be able
* to send an alert.
*/
SSLfatal(s, SSL_AD_NO_ALERT,
SSL_F_SSL3_SETUP_WRITE_BUFFER, ERR_R_MALLOC_FAILURE);
return 0;
}
memset(thiswb, 0, sizeof(SSL3_BUFFER));
thiswb->buf = p;
thiswb->len = len;
}
}
return 1;
}
int ssl3_setup_buffers(SSL *s)
{
if (!ssl3_setup_read_buffer(s)) {
/* SSLfatal() already called */
return 0;
}
if (!ssl3_setup_write_buffer(s, 1, 0)) {
/* SSLfatal() already called */
return 0;
}
return 1;
}
int ssl3_release_write_buffer(SSL *s)
{
SSL3_BUFFER *wb;
size_t pipes;
pipes = s->rlayer.numwpipes;
while (pipes > 0) {
wb = &RECORD_LAYER_get_wbuf(&s->rlayer)[pipes - 1];
OPENSSL_free(wb->buf);
wb->buf = NULL;
pipes--;
}
s->rlayer.numwpipes = 0;
return 1;
}
int ssl3_release_read_buffer(SSL *s)
{
SSL3_BUFFER *b;
b = RECORD_LAYER_get_rbuf(&s->rlayer);
OPENSSL_free(b->buf);
b->buf = NULL;
return 1;
}
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