110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
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/*
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* Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "e_os.h"
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#include "eng_local.h"
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/*
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* Initialise a engine type for use (or up its functional reference count if
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* it's already in use). This version is only used internally.
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*/
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int engine_unlocked_init(ENGINE *e)
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{
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int to_return = 1;
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if ((e->funct_ref == 0) && e->init)
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/*
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* This is the first functional reference and the engine requires
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* initialisation so we do it now.
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*/
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to_return = e->init(e);
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if (to_return) {
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/*
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* OK, we return a functional reference which is also a structural
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* reference.
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*/
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e->struct_ref++;
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e->funct_ref++;
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engine_ref_debug(e, 0, 1);
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engine_ref_debug(e, 1, 1);
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}
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return to_return;
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}
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/*
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* Free a functional reference to a engine type. This version is only used
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* internally.
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*/
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int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
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{
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int to_return = 1;
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/*
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* Reduce the functional reference count here so if it's the terminating
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* case, we can release the lock safely and call the finish() handler
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* without risk of a race. We get a race if we leave the count until
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* after and something else is calling "finish" at the same time -
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* there's a chance that both threads will together take the count from 2
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* to 0 without either calling finish().
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*/
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e->funct_ref--;
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engine_ref_debug(e, 1, -1);
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if ((e->funct_ref == 0) && e->finish) {
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if (unlock_for_handlers)
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CRYPTO_THREAD_unlock(global_engine_lock);
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to_return = e->finish(e);
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if (unlock_for_handlers)
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CRYPTO_THREAD_write_lock(global_engine_lock);
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if (!to_return)
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return 0;
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}
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REF_ASSERT_ISNT(e->funct_ref < 0);
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/* Release the structural reference too */
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if (!engine_free_util(e, 0)) {
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ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH, ENGINE_R_FINISH_FAILED);
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return 0;
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}
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return to_return;
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}
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/* The API (locked) version of "init" */
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int ENGINE_init(ENGINE *e)
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{
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int ret;
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if (e == NULL) {
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ENGINEerr(ENGINE_F_ENGINE_INIT, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
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ENGINEerr(ENGINE_F_ENGINE_INIT, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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ret = engine_unlocked_init(e);
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CRYPTO_THREAD_unlock(global_engine_lock);
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return ret;
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}
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/* The API (locked) version of "finish" */
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int ENGINE_finish(ENGINE *e)
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{
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int to_return = 1;
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if (e == NULL)
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return 1;
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CRYPTO_THREAD_write_lock(global_engine_lock);
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to_return = engine_unlocked_finish(e, 1);
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CRYPTO_THREAD_unlock(global_engine_lock);
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if (!to_return) {
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ENGINEerr(ENGINE_F_ENGINE_FINISH, ENGINE_R_FINISH_FAILED);
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return 0;
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}
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return to_return;
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}
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