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/* $OpenBSD: bf_nbio.c,v 1.23 2023/07/05 21:23:37 beck Exp $ */
/* 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>
#include <stdio.h>
#include <stdlib.h>
#include <openssl/bio.h>
#include "bio_local.h"
/* BIO_put and BIO_get both add to the digest,
* BIO_gets returns the digest */
static int nbiof_write(BIO *h, const char *buf, int num);
static int nbiof_read(BIO *h, char *buf, int size);
static int nbiof_puts(BIO *h, const char *str);
static int nbiof_gets(BIO *h, char *str, int size);
static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int nbiof_new(BIO *h);
static int nbiof_free(BIO *data);
static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
typedef struct nbio_test_st {
/* only set if we sent a 'should retry' error */
int lrn;
int lwn;
} NBIO_TEST;
static const BIO_METHOD methods_nbiof = {
.type = BIO_TYPE_NBIO_TEST,
.name = "non-blocking IO test filter",
.bwrite = nbiof_write,
.bread = nbiof_read,
.bputs = nbiof_puts,
.bgets = nbiof_gets,
.ctrl = nbiof_ctrl,
.create = nbiof_new,
.destroy = nbiof_free,
.callback_ctrl = nbiof_callback_ctrl
};
const BIO_METHOD *
BIO_f_nbio_test(void)
{
return (&methods_nbiof);
}
LCRYPTO_ALIAS(BIO_f_nbio_test);
static int
nbiof_new(BIO *bi)
{
NBIO_TEST *nt;
if (!(nt = malloc(sizeof(NBIO_TEST))))
return (0);
nt->lrn = -1;
nt->lwn = -1;
bi->ptr = (char *)nt;
bi->init = 1;
bi->flags = 0;
return (1);
}
static int
nbiof_free(BIO *a)
{
if (a == NULL)
return (0);
free(a->ptr);
a->ptr = NULL;
a->init = 0;
a->flags = 0;
return (1);
}
static int
nbiof_read(BIO *b, char *out, int outl)
{
int ret = 0;
int num;
unsigned char n;
if (out == NULL)
return (0);
if (b->next_bio == NULL)
return (0);
BIO_clear_retry_flags(b);
arc4random_buf(&n, 1);
num = (n & 0x07);
if (outl > num)
outl = num;
if (num == 0) {
ret = -1;
BIO_set_retry_read(b);
} else {
ret = BIO_read(b->next_bio, out, outl);
if (ret < 0)
BIO_copy_next_retry(b);
}
return (ret);
}
static int
nbiof_write(BIO *b, const char *in, int inl)
{
NBIO_TEST *nt;
int ret = 0;
int num;
unsigned char n;
if ((in == NULL) || (inl <= 0))
return (0);
if (b->next_bio == NULL)
return (0);
nt = (NBIO_TEST *)b->ptr;
BIO_clear_retry_flags(b);
if (nt->lwn > 0) {
num = nt->lwn;
nt->lwn = 0;
} else {
arc4random_buf(&n, 1);
num = (n&7);
}
if (inl > num)
inl = num;
if (num == 0) {
ret = -1;
BIO_set_retry_write(b);
} else {
ret = BIO_write(b->next_bio, in, inl);
if (ret < 0) {
BIO_copy_next_retry(b);
nt->lwn = inl;
}
}
return (ret);
}
static long
nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret;
if (b->next_bio == NULL)
return (0);
switch (cmd) {
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
BIO_copy_next_retry(b);
break;
case BIO_CTRL_DUP:
ret = 0L;
break;
default:
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
}
return (ret);
}
static long
nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
long ret = 1;
if (b->next_bio == NULL)
return (0);
switch (cmd) {
default:
ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
break;
}
return (ret);
}
static int
nbiof_gets(BIO *bp, char *buf, int size)
{
if (bp->next_bio == NULL)
return (0);
return (BIO_gets(bp->next_bio, buf, size));
}
static int
nbiof_puts(BIO *bp, const char *str)
{
if (bp->next_bio == NULL)
return (0);
return (BIO_puts(bp->next_bio, str));
}
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