110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
|
|
* Copyright 2001-2017 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 "e_os.h"
|
|
#include "eng_local.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;
|
|
}
|
|
if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
|
|
ENGINEerr(ENGINE_F_ENGINE_INIT, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
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;
|
|
}
|