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/* $OpenBSD: eng_init.c,v 1.9 2018/04/14 07:09:21 tb Exp $ */
/* ====================================================================
* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
*
* 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 above 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 acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <openssl/err.h>
#include "eng_int.h"
/* Initialise a engine type for use (or up its functional reference count
* if it's already in use). This version is only used internally. */
int
engine_unlocked_init(ENGINE *e)
{
int to_return = 1;
if ((e->funct_ref == 0) && e->init)
/* This is the first functional reference and the engine
* requires initialisation so we do it now. */
to_return = e->init(e);
if (to_return) {
/* OK, we return a functional reference which is also a
* structural reference. */
e->struct_ref++;
e->funct_ref++;
engine_ref_debug(e, 0, 1)
engine_ref_debug(e, 1, 1)
}
return to_return;
}
/* Free a functional reference to a engine type. This version is only used
* internally. */
int
engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
{
int to_return = 1;
/* Reduce the functional reference count here so if it's the terminating
* case, we can release the lock safely and call the finish() handler
* without risk of a race. We get a race if we leave the count until
* after and something else is calling "finish" at the same time -
* there's a chance that both threads will together take the count from
* 2 to 0 without either calling finish(). */
e->funct_ref--;
engine_ref_debug(e, 1, -1);
if ((e->funct_ref == 0) && e->finish) {
if (unlock_for_handlers)
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
to_return = e->finish(e);
if (unlock_for_handlers)
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
if (!to_return)
return 0;
}
/* Release the structural reference too */
if (!engine_free_util(e, 0)) {
ENGINEerror(ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}
/* The API (locked) version of "init" */
int
ENGINE_init(ENGINE *e)
{
int ret;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = engine_unlocked_init(e);
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return ret;
}
/* The API (locked) version of "finish" */
int
ENGINE_finish(ENGINE *e)
{
int to_return = 1;
if (e == NULL)
return 1;
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
to_return = engine_unlocked_finish(e, 1);
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
if (!to_return) {
ENGINEerror(ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}
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