A local copy of OpenSSL from GitHub
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/*
* Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#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_THREAD_unlock(global_engine_lock);
to_return = e->finish(e);
if (unlock_for_handlers)
CRYPTO_THREAD_write_lock(global_engine_lock);
if (!to_return)
return 0;
}
REF_ASSERT_ISNT(e->funct_ref < 0);
/* Release the structural reference too */
if (!engine_free_util(e, 0)) {
ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH, 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) {
ENGINEerr(ENGINE_F_ENGINE_INIT, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_THREAD_run_once(&engine_lock_init, do_engine_lock_init);
CRYPTO_THREAD_write_lock(global_engine_lock);
ret = engine_unlocked_init(e);
CRYPTO_THREAD_unlock(global_engine_lock);
return ret;
}
/* The API (locked) version of "finish" */
int ENGINE_finish(ENGINE *e)
{
int to_return = 1;
if (e == NULL)
return 1;
CRYPTO_THREAD_write_lock(global_engine_lock);
to_return = engine_unlocked_finish(e, 1);
CRYPTO_THREAD_unlock(global_engine_lock);
if (!to_return) {
ENGINEerr(ENGINE_F_ENGINE_FINISH, ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}