159 lines
3.8 KiB
C
159 lines
3.8 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "../ssl_locl.h"
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#include "record_locl.h"
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void SSL3_BUFFER_set_data(SSL3_BUFFER *b, const unsigned char *d, size_t n)
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{
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if (d != NULL)
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memcpy(b->buf, d, n);
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b->left = n;
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b->offset = 0;
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}
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/*
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* Clear the contents of an SSL3_BUFFER but retain any memory allocated. Also
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* retains the default_len setting
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*/
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void SSL3_BUFFER_clear(SSL3_BUFFER *b)
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{
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b->offset = 0;
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b->left = 0;
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}
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void SSL3_BUFFER_release(SSL3_BUFFER *b)
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{
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OPENSSL_free(b->buf);
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b->buf = NULL;
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}
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int ssl3_setup_read_buffer(SSL *s)
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{
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unsigned char *p;
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size_t len, align = 0, headerlen;
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SSL3_BUFFER *b;
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b = RECORD_LAYER_get_rbuf(&s->rlayer);
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if (SSL_IS_DTLS(s))
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headerlen = DTLS1_RT_HEADER_LENGTH;
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else
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headerlen = SSL3_RT_HEADER_LENGTH;
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#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
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align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
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#endif
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if (b->buf == NULL) {
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len = SSL3_RT_MAX_PLAIN_LENGTH
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+ SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
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#ifndef OPENSSL_NO_COMP
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if (ssl_allow_compression(s))
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len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
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#endif
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if (b->default_len > len)
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len = b->default_len;
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if ((p = OPENSSL_malloc(len)) == NULL)
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goto err;
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b->buf = p;
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b->len = len;
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}
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RECORD_LAYER_set_packet(&s->rlayer, &(b->buf[0]));
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return 1;
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err:
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SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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int ssl3_setup_write_buffer(SSL *s, size_t numwpipes, size_t len)
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{
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unsigned char *p;
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size_t align = 0, headerlen;
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SSL3_BUFFER *wb;
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size_t currpipe;
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s->rlayer.numwpipes = numwpipes;
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if (len == 0) {
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if (SSL_IS_DTLS(s))
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headerlen = DTLS1_RT_HEADER_LENGTH + 1;
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else
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headerlen = SSL3_RT_HEADER_LENGTH;
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#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
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align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
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#endif
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len = s->max_send_fragment
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+ SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
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#ifndef OPENSSL_NO_COMP
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if (ssl_allow_compression(s))
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len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
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#endif
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if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
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len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
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}
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wb = RECORD_LAYER_get_wbuf(&s->rlayer);
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for (currpipe = 0; currpipe < numwpipes; currpipe++) {
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if (wb[currpipe].buf == NULL) {
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if ((p = OPENSSL_malloc(len)) == NULL) {
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s->rlayer.numwpipes = currpipe;
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goto err;
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}
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wb[currpipe].buf = p;
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wb[currpipe].len = len;
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}
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}
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return 1;
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err:
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SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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int ssl3_setup_buffers(SSL *s)
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{
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if (!ssl3_setup_read_buffer(s))
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return 0;
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if (!ssl3_setup_write_buffer(s, 1, 0))
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return 0;
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return 1;
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}
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int ssl3_release_write_buffer(SSL *s)
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{
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SSL3_BUFFER *wb;
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size_t pipes;
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pipes = s->rlayer.numwpipes;
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while (pipes > 0) {
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wb = &RECORD_LAYER_get_wbuf(&s->rlayer)[pipes - 1];
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OPENSSL_free(wb->buf);
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wb->buf = NULL;
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pipes--;
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}
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s->rlayer.numwpipes = 0;
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return 1;
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}
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int ssl3_release_read_buffer(SSL *s)
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{
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SSL3_BUFFER *b;
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b = RECORD_LAYER_get_rbuf(&s->rlayer);
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OPENSSL_free(b->buf);
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b->buf = NULL;
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return 1;
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}
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