check in v3.8.1 source
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367
crypto/bio/bss_mem.c
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367
crypto/bio/bss_mem.c
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/* $OpenBSD: bss_mem.c,v 1.22 2023/07/05 21:23:37 beck Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <openssl/buffer.h>
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#include "bio_local.h"
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struct bio_mem {
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BUF_MEM *buf;
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size_t read_offset;
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};
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static size_t
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bio_mem_pending(struct bio_mem *bm)
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{
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if (bm->read_offset > bm->buf->length)
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return 0;
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return bm->buf->length - bm->read_offset;
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}
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static uint8_t *
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bio_mem_read_ptr(struct bio_mem *bm)
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{
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return &bm->buf->data[bm->read_offset];
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}
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static int mem_new(BIO *bio);
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static int mem_free(BIO *bio);
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static int mem_write(BIO *bio, const char *in, int in_len);
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static int mem_read(BIO *bio, char *out, int out_len);
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static int mem_puts(BIO *bio, const char *in);
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static int mem_gets(BIO *bio, char *out, int out_len);
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static long mem_ctrl(BIO *bio, int cmd, long arg1, void *arg2);
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static const BIO_METHOD mem_method = {
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.type = BIO_TYPE_MEM,
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.name = "memory buffer",
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.bwrite = mem_write,
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.bread = mem_read,
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.bputs = mem_puts,
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.bgets = mem_gets,
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.ctrl = mem_ctrl,
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.create = mem_new,
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.destroy = mem_free
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};
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/*
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* bio->num is used to hold the value to return on 'empty', if it is
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* 0, should_retry is not set.
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*/
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const BIO_METHOD *
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BIO_s_mem(void)
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{
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return &mem_method;
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}
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LCRYPTO_ALIAS(BIO_s_mem);
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BIO *
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BIO_new_mem_buf(const void *buf, int buf_len)
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{
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struct bio_mem *bm;
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BIO *bio;
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if (buf == NULL) {
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BIOerror(BIO_R_NULL_PARAMETER);
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return NULL;
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}
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if (buf_len == -1)
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buf_len = strlen(buf);
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if (buf_len < 0) {
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BIOerror(BIO_R_INVALID_ARGUMENT);
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return NULL;
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}
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if ((bio = BIO_new(BIO_s_mem())) == NULL)
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return NULL;
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bm = bio->ptr;
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bm->buf->data = (void *)buf; /* Trust in the BIO_FLAGS_MEM_RDONLY flag. */
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bm->buf->length = buf_len;
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bm->buf->max = buf_len;
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bio->flags |= BIO_FLAGS_MEM_RDONLY;
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/* Since this is static data retrying will not help. */
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bio->num = 0;
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return bio;
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}
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LCRYPTO_ALIAS(BIO_new_mem_buf);
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static int
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mem_new(BIO *bio)
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{
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struct bio_mem *bm;
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if ((bm = calloc(1, sizeof(*bm))) == NULL)
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return 0;
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if ((bm->buf = BUF_MEM_new()) == NULL) {
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free(bm);
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return 0;
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}
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bio->shutdown = 1;
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bio->init = 1;
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bio->num = -1;
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bio->ptr = bm;
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return 1;
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}
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static int
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mem_free(BIO *bio)
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{
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struct bio_mem *bm;
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if (bio == NULL)
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return 0;
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if (!bio->init || bio->ptr == NULL)
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return 1;
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bm = bio->ptr;
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if (bio->shutdown) {
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if (bio->flags & BIO_FLAGS_MEM_RDONLY)
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bm->buf->data = NULL;
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BUF_MEM_free(bm->buf);
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}
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free(bm);
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bio->ptr = NULL;
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return 1;
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}
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static int
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mem_read(BIO *bio, char *out, int out_len)
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{
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struct bio_mem *bm = bio->ptr;
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BIO_clear_retry_flags(bio);
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if (out == NULL || out_len <= 0)
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return 0;
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if ((size_t)out_len > bio_mem_pending(bm))
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out_len = bio_mem_pending(bm);
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if (out_len == 0) {
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if (bio->num != 0)
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BIO_set_retry_read(bio);
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return bio->num;
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}
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memcpy(out, bio_mem_read_ptr(bm), out_len);
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bm->read_offset += out_len;
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return out_len;
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}
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static int
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mem_write(BIO *bio, const char *in, int in_len)
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{
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struct bio_mem *bm = bio->ptr;
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size_t buf_len;
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BIO_clear_retry_flags(bio);
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if (in == NULL || in_len <= 0)
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return 0;
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if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
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BIOerror(BIO_R_WRITE_TO_READ_ONLY_BIO);
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return -1;
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}
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if (bm->read_offset > 4096) {
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memmove(bm->buf->data, bio_mem_read_ptr(bm),
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bio_mem_pending(bm));
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bm->buf->length = bio_mem_pending(bm);
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bm->read_offset = 0;
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}
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/*
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* Check for overflow and ensure we do not exceed an int, otherwise we
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* cannot tell if BUF_MEM_grow_clean() succeeded.
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*/
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buf_len = bm->buf->length + in_len;
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if (buf_len < bm->buf->length || buf_len > INT_MAX)
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return -1;
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if (BUF_MEM_grow_clean(bm->buf, buf_len) != buf_len)
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return -1;
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memcpy(&bm->buf->data[buf_len - in_len], in, in_len);
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return in_len;
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}
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static long
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mem_ctrl(BIO *bio, int cmd, long num, void *ptr)
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{
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struct bio_mem *bm = bio->ptr;
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void **pptr;
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long ret = 1;
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switch (cmd) {
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case BIO_CTRL_RESET:
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if (bm->buf->data != NULL) {
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if (!(bio->flags & BIO_FLAGS_MEM_RDONLY)) {
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memset(bm->buf->data, 0, bm->buf->max);
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bm->buf->length = 0;
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}
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bm->read_offset = 0;
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}
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break;
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case BIO_CTRL_EOF:
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ret = (long)(bio_mem_pending(bm) == 0);
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break;
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case BIO_C_SET_BUF_MEM_EOF_RETURN:
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bio->num = (int)num;
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break;
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case BIO_CTRL_INFO:
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if (ptr != NULL) {
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pptr = (void **)ptr;
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*pptr = bio_mem_read_ptr(bm);
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}
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ret = (long)bio_mem_pending(bm);
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break;
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case BIO_C_SET_BUF_MEM:
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BUF_MEM_free(bm->buf);
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bio->shutdown = (int)num;
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bm->buf = ptr;
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bm->read_offset = 0;
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break;
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case BIO_C_GET_BUF_MEM_PTR:
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if (ptr != NULL) {
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pptr = (void **)ptr;
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*pptr = bm->buf;
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}
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break;
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case BIO_CTRL_GET_CLOSE:
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ret = (long)bio->shutdown;
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break;
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case BIO_CTRL_SET_CLOSE:
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bio->shutdown = (int)num;
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break;
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case BIO_CTRL_WPENDING:
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ret = 0L;
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break;
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case BIO_CTRL_PENDING:
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ret = (long)bio_mem_pending(bm);
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break;
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case BIO_CTRL_DUP:
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case BIO_CTRL_FLUSH:
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ret = 1;
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break;
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case BIO_CTRL_PUSH:
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case BIO_CTRL_POP:
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default:
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ret = 0;
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break;
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}
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return ret;
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}
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static int
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mem_gets(BIO *bio, char *out, int out_len)
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{
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struct bio_mem *bm = bio->ptr;
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int i, out_max;
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char *p;
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int ret = -1;
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BIO_clear_retry_flags(bio);
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out_max = bio_mem_pending(bm);
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if (out_len - 1 < out_max)
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out_max = out_len - 1;
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if (out_max <= 0) {
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*out = '\0';
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return 0;
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}
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p = bio_mem_read_ptr(bm);
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for (i = 0; i < out_max; i++) {
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if (p[i] == '\n') {
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i++;
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break;
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}
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}
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/*
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* i is now the max num of bytes to copy, either out_max or up to and
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* including the first newline
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*/
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if ((ret = mem_read(bio, out, i)) > 0)
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out[ret] = '\0';
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return ret;
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}
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static int
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mem_puts(BIO *bio, const char *in)
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{
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return mem_write(bio, in, strlen(in));
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}
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