pineapple-src/externals/libressl/crypto/bio/bss_mem.c

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/* $OpenBSD: bss_mem.c,v 1.21 2022/02/19 15:59:12 jsing Exp $ */
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/* 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 <errno.h>
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#include <limits.h>
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#include <stdio.h>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/buffer.h>
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#include "bio_local.h"
struct bio_mem {
BUF_MEM *buf;
size_t read_offset;
};
static size_t
bio_mem_pending(struct bio_mem *bm)
{
if (bm->read_offset > bm->buf->length)
return 0;
return bm->buf->length - bm->read_offset;
}
static uint8_t *
bio_mem_read_ptr(struct bio_mem *bm)
{
return &bm->buf->data[bm->read_offset];
}
static int mem_new(BIO *bio);
static int mem_free(BIO *bio);
static int mem_write(BIO *bio, const char *in, int in_len);
static int mem_read(BIO *bio, char *out, int out_len);
static int mem_puts(BIO *bio, const char *in);
static int mem_gets(BIO *bio, char *out, int out_len);
static long mem_ctrl(BIO *bio, int cmd, long arg1, void *arg2);
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static const BIO_METHOD mem_method = {
.type = BIO_TYPE_MEM,
.name = "memory buffer",
.bwrite = mem_write,
.bread = mem_read,
.bputs = mem_puts,
.bgets = mem_gets,
.ctrl = mem_ctrl,
.create = mem_new,
.destroy = mem_free
};
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/*
* bio->num is used to hold the value to return on 'empty', if it is
* 0, should_retry is not set.
*/
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const BIO_METHOD *
BIO_s_mem(void)
{
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return &mem_method;
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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;
BIO *bio;
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if (buf == NULL) {
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BIOerror(BIO_R_NULL_PARAMETER);
return NULL;
}
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if (buf_len == -1)
buf_len = strlen(buf);
if (buf_len < 0) {
BIOerror(BIO_R_INVALID_ARGUMENT);
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return NULL;
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}
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
bm = bio->ptr;
bm->buf->data = (void *)buf; /* Trust in the BIO_FLAGS_MEM_RDONLY flag. */
bm->buf->length = buf_len;
bm->buf->max = buf_len;
bio->flags |= BIO_FLAGS_MEM_RDONLY;
/* Since this is static data retrying will not help. */
bio->num = 0;
return bio;
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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;
if ((bm = calloc(1, sizeof(*bm))) == NULL)
return 0;
if ((bm->buf = BUF_MEM_new()) == NULL) {
free(bm);
return 0;
}
bio->shutdown = 1;
bio->init = 1;
bio->num = -1;
bio->ptr = bm;
return 1;
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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;
if (bio == NULL)
return 0;
if (!bio->init || bio->ptr == NULL)
return 1;
bm = bio->ptr;
if (bio->shutdown) {
if (bio->flags & BIO_FLAGS_MEM_RDONLY)
bm->buf->data = NULL;
BUF_MEM_free(bm->buf);
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}
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free(bm);
bio->ptr = NULL;
return 1;
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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;
BIO_clear_retry_flags(bio);
if (out == NULL || out_len <= 0)
return 0;
if ((size_t)out_len > bio_mem_pending(bm))
out_len = bio_mem_pending(bm);
if (out_len == 0) {
if (bio->num != 0)
BIO_set_retry_read(bio);
return bio->num;
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}
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memcpy(out, bio_mem_read_ptr(bm), out_len);
bm->read_offset += out_len;
return out_len;
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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;
size_t buf_len;
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BIO_clear_retry_flags(bio);
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if (in == NULL || in_len <= 0)
return 0;
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;
}
if (bm->read_offset > 4096) {
memmove(bm->buf->data, bio_mem_read_ptr(bm),
bio_mem_pending(bm));
bm->buf->length = bio_mem_pending(bm);
bm->read_offset = 0;
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}
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/*
* Check for overflow and ensure we do not exceed an int, otherwise we
* cannot tell if BUF_MEM_grow_clean() succeeded.
*/
buf_len = bm->buf->length + in_len;
if (buf_len < bm->buf->length || buf_len > INT_MAX)
return -1;
if (BUF_MEM_grow_clean(bm->buf, buf_len) != buf_len)
return -1;
memcpy(&bm->buf->data[buf_len - in_len], in, in_len);
return in_len;
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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;
void **pptr;
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long ret = 1;
switch (cmd) {
case BIO_CTRL_RESET:
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if (bm->buf->data != NULL) {
if (!(bio->flags & BIO_FLAGS_MEM_RDONLY)) {
memset(bm->buf->data, 0, bm->buf->max);
bm->buf->length = 0;
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}
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bm->read_offset = 0;
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}
break;
case BIO_CTRL_EOF:
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ret = (long)(bio_mem_pending(bm) == 0);
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break;
case BIO_C_SET_BUF_MEM_EOF_RETURN:
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bio->num = (int)num;
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break;
case BIO_CTRL_INFO:
if (ptr != NULL) {
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pptr = (void **)ptr;
*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;
case BIO_C_SET_BUF_MEM:
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BUF_MEM_free(bm->buf);
bio->shutdown = (int)num;
bm->buf = ptr;
bm->read_offset = 0;
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break;
case BIO_C_GET_BUF_MEM_PTR:
if (ptr != NULL) {
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pptr = (void **)ptr;
*pptr = bm->buf;
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}
break;
case BIO_CTRL_GET_CLOSE:
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ret = (long)bio->shutdown;
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break;
case BIO_CTRL_SET_CLOSE:
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bio->shutdown = (int)num;
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break;
case BIO_CTRL_WPENDING:
ret = 0L;
break;
case BIO_CTRL_PENDING:
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ret = (long)bio_mem_pending(bm);
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break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret = 1;
break;
case BIO_CTRL_PUSH:
case BIO_CTRL_POP:
default:
ret = 0;
break;
}
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return ret;
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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;
int i, out_max;
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char *p;
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int ret = -1;
BIO_clear_retry_flags(bio);
out_max = bio_mem_pending(bm);
if (out_len - 1 < out_max)
out_max = out_len - 1;
if (out_max <= 0) {
*out = '\0';
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return 0;
}
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p = bio_mem_read_ptr(bm);
for (i = 0; i < out_max; i++) {
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if (p[i] == '\n') {
i++;
break;
}
}
/*
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* i is now the max num of bytes to copy, either out_max or up to and
* including the first newline
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*/
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if ((ret = mem_read(bio, out, i)) > 0)
out[ret] = '\0';
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return ret;
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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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}