/*

 * Copyright 2016-2022 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 "crypto/cryptlib.h"

#include <openssl/err.h>

#include "crypto/rand.h"

#include "internal/bio.h"

#include <openssl/evp.h>

#include "crypto/evp.h"

#include "internal/conf.h"

#include "crypto/async.h"

#include "crypto/engine.h"

#include "internal/comp.h"

#include "internal/err.h"

#include "crypto/err.h"

#include "crypto/objects.h"

#include <stdlib.h>

#include <assert.h>

#include "internal/thread_once.h"

#include "crypto/dso_conf.h"

#include "internal/dso.h"

#include "crypto/store.h"

static int stopped = 0;

/*

 * Since per-thread-specific-data destructors are not universally

 * available, i.e. not on Windows, only below CRYPTO_THREAD_LOCAL key

 * is assumed to have destructor associated. And then an effort is made

 * to call this single destructor on non-pthread platform[s].

 *

 * Initial value is "impossible". It is used as guard value to shortcut

 * destructor for threads terminating before libcrypto is initialized or

 * after it's de-initialized. Access to the key doesn't have to be

 * serialized for the said threads, because they didn't use libcrypto

 * and it doesn't matter if they pick "impossible" or dereference real

 * key value and pull NULL past initialization in the first thread that

 * intends to use libcrypto.

 */

static union {

    long sane;

    CRYPTO_THREAD_LOCAL value;

} destructor_key = { -1 };

static void ossl_init_thread_stop(struct thread_local_inits_st *locals);

static void ossl_init_thread_destructor(void *local)

{

    ossl_init_thread_stop((struct thread_local_inits_st *)local);

}

static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)

{

    struct thread_local_inits_st *local =

        CRYPTO_THREAD_get_local(&destructor_key.value);

    if (alloc) {

        if (local == NULL

            && (local = OPENSSL_zalloc(sizeof(*local))) != NULL

            && !CRYPTO_THREAD_set_local(&destructor_key.value, local)) {

            OPENSSL_free(local);

            return NULL;

        }

    } else {

        CRYPTO_THREAD_set_local(&destructor_key.value, NULL);

    }

    return local;

}

typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;

struct ossl_init_stop_st {

    void (*handler)(void);

    OPENSSL_INIT_STOP *next;

};

static OPENSSL_INIT_STOP *stop_handlers = NULL;

static CRYPTO_RWLOCK *init_lock = NULL;

static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;

static int base_inited = 0;

DEFINE_RUN_ONCE_STATIC(ossl_init_base)

{

    CRYPTO_THREAD_LOCAL key;

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");

#endif

#ifndef OPENSSL_NO_CRYPTO_MDEBUG

    ossl_malloc_setup_failures();

#endif

    if (!CRYPTO_THREAD_init_local(&key, ossl_init_thread_destructor))

        return 0;

    if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)

        goto err;

    OPENSSL_cpuid_setup();

    destructor_key.value = key;

    base_inited = 1;

    return 1;

err:

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_base not ok!\n");

#endif

    CRYPTO_THREAD_lock_free(init_lock);

    init_lock = NULL;

    CRYPTO_THREAD_cleanup_local(&key);

    return 0;

}

static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;

#if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)

static int win32atexit(void)

{

    OPENSSL_cleanup();

    return 0;

}

#endif

DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)

{

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");

#endif

#ifndef OPENSSL_SYS_UEFI

# ifdef _WIN32

    /* We use _onexit() in preference because it gets called on DLL unload */

    if (_onexit(win32atexit) == NULL)

        return 0;

# else

    if (atexit(OPENSSL_cleanup) != 0)

        return 0;

# endif

#endif

    return 1;

}

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,

                           ossl_init_register_atexit)

{

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");

#endif

    /* Do nothing in this case */

    return 1;

}

static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)

{

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_nodelete()\n");

#endif

#if !defined(OPENSSL_USE_NODELETE) \

    && !defined(OPENSSL_NO_PINSHARED)

# if defined(DSO_WIN32) && !defined(_WIN32_WCE)

    {

        HMODULE handle = NULL;

        BOOL ret;

        /* We don't use the DSO route for WIN32 because there is a better way */

        ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS

                                | GET_MODULE_HANDLE_EX_FLAG_PIN,

                                (void *)&base_inited, &handle);

#  ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: obtained DSO reference? %s\n",

                (ret == TRUE ? "No!" : "Yes."));

#  endif

        return (ret == TRUE) ? 1 : 0;

    }

# elif !defined(DSO_NONE)

    /*

     * Deliberately leak a reference to ourselves. This will force the library

     * to remain loaded until the atexit() handler is run at process exit.

     */

    {

        DSO *dso;

        void *err;

        if (!err_shelve_state(&err))

            return 0;

        dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);

#  ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: obtained DSO reference? %s\n",

                (dso == NULL ? "No!" : "Yes."));

        /*

         * In case of No!, it is uncertain our exit()-handlers can still be

         * called. After dlclose() the whole library might have been unloaded

         * already.

         */

#  endif

        DSO_free(dso);

        err_unshelve_state(err);

    }

# endif

#endif

    return 1;

}

static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)

{

    int ret = 1;

    /*

     * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time

     * pulling in all the error strings during static linking

     */

#if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)

# ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "

                    "err_load_crypto_strings_int()\n");

# endif

    ret = err_load_crypto_strings_int();

#endif

    return ret;

}

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,

                           ossl_init_load_crypto_strings)

{

    /* Do nothing in this case */

    return 1;

}

static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)

{

    /*

     * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time

     * pulling in all the ciphers during static linking

     */

#ifndef OPENSSL_NO_AUTOALGINIT

# ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "

                    "openssl_add_all_ciphers_int()\n");

# endif

    openssl_add_all_ciphers_int();

#endif

    return 1;

}

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,

                           ossl_init_add_all_ciphers)

{

    /* Do nothing */

    return 1;

}

static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)

{

    /*

     * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time

     * pulling in all the ciphers during static linking

     */

#ifndef OPENSSL_NO_AUTOALGINIT

# ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "

                    "openssl_add_all_digests()\n");

# endif

    openssl_add_all_digests_int();

#endif

    return 1;

}

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,

                           ossl_init_add_all_digests)

{

    /* Do nothing */

    return 1;

}

static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;

static int config_inited = 0;

static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;

DEFINE_RUN_ONCE_STATIC(ossl_init_config)

{

    int ret = openssl_config_int(conf_settings);

    config_inited = 1;

    return ret;

}

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)

{

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr,

            "OPENSSL_INIT: ossl_init_config: openssl_no_config_int()\n");

#endif

    openssl_no_config_int();

    config_inited = 1;

    return 1;

}

static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;

static int async_inited = 0;

DEFINE_RUN_ONCE_STATIC(ossl_init_async)

{

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");

#endif

    if (!async_init())

        return 0;

    async_inited = 1;

    return 1;

}

#ifndef OPENSSL_NO_ENGINE

static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)

{

# ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "

                    "engine_load_openssl_int()\n");

# endif

    engine_load_openssl_int();

    return 1;

}

# ifndef OPENSSL_NO_DEVCRYPTOENG

static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)

{

#  ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_devcrypto: "

                    "engine_load_devcrypto_int()\n");

#  endif

    engine_load_devcrypto_int();

    return 1;

}

# endif

# ifndef OPENSSL_NO_RDRAND

static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)

{

#  ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "

                    "engine_load_rdrand_int()\n");

#  endif

    engine_load_rdrand_int();

    return 1;

}

# endif

static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)

{

# ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "

                    "engine_load_dynamic_int()\n");

# endif

    engine_load_dynamic_int();

    return 1;

}

# ifndef OPENSSL_NO_STATIC_ENGINE

#  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)

static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)

{

#   ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "

                    "engine_load_padlock_int()\n");

#   endif

    engine_load_padlock_int();

    return 1;

}

#  endif

#  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)

static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)

{

#   ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "

                    "engine_load_capi_int()\n");

#   endif

    engine_load_capi_int();

    return 1;

}

#  endif

#  if !defined(OPENSSL_NO_AFALGENG)

static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)

{

#   ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "

                    "engine_load_afalg_int()\n");

#   endif

    engine_load_afalg_int();

    return 1;

}

#  endif

# endif

#endif

#ifndef OPENSSL_NO_COMP

static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;

static int zlib_inited = 0;

DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)

{

    /* Do nothing - we need to know about this for the later cleanup */

    zlib_inited = 1;

    return 1;

}

#endif

static void ossl_init_thread_stop(struct thread_local_inits_st *locals)

{

    /* Can't do much about this */

    if (locals == NULL)

        return;

    if (locals->async) {

#ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "

                        "async_delete_thread_state()\n");

#endif

        async_delete_thread_state();

    }

    if (locals->err_state) {

#ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "

                        "err_delete_thread_state()\n");

#endif

        err_delete_thread_state();

    }

    if (locals->rand) {

#ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "

                        "drbg_delete_thread_state()\n");

#endif

        drbg_delete_thread_state();

    }

    OPENSSL_free(locals);

}

void OPENSSL_thread_stop(void)

{

    if (destructor_key.sane != -1)

        ossl_init_thread_stop(ossl_init_get_thread_local(0));

}

int ossl_init_thread_start(uint64_t opts)

{

    struct thread_local_inits_st *locals;

    if (!OPENSSL_init_crypto(0, NULL))

        return 0;

    locals = ossl_init_get_thread_local(1);

    if (locals == NULL)

        return 0;

    if (opts & OPENSSL_INIT_THREAD_ASYNC) {

#ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "

                        "marking thread for async\n");

#endif

        locals->async = 1;

    }

    if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {

#ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "

                        "marking thread for err_state\n");

#endif

        locals->err_state = 1;

    }

    if (opts & OPENSSL_INIT_THREAD_RAND) {

#ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "

                        "marking thread for rand\n");

#endif

        locals->rand = 1;

    }

    return 1;

}

void OPENSSL_cleanup(void)

{

    OPENSSL_INIT_STOP *currhandler, *lasthandler;

    CRYPTO_THREAD_LOCAL key;

    /* If we've not been inited then no need to deinit */

    if (!base_inited)

        return;

    /* Might be explicitly called and also by atexit */

    if (stopped)

        return;

    stopped = 1;

    /*

     * Thread stop may not get automatically called by the thread library for

     * the very last thread in some situations, so call it directly.

     */

    ossl_init_thread_stop(ossl_init_get_thread_local(0));

    currhandler = stop_handlers;

    while (currhandler != NULL) {

        currhandler->handler();

        lasthandler = currhandler;

        currhandler = currhandler->next;

        OPENSSL_free(lasthandler);

    }

    stop_handlers = NULL;

    CRYPTO_THREAD_lock_free(init_lock);

    init_lock = NULL;

    /*

     * We assume we are single-threaded for this function, i.e. no race

     * conditions for the various "*_inited" vars below.

     */

#ifndef OPENSSL_NO_COMP

    if (zlib_inited) {

#ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                        "comp_zlib_cleanup_int()\n");

#endif

        comp_zlib_cleanup_int();

    }

#endif

    if (async_inited) {

# ifdef OPENSSL_INIT_DEBUG

        fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                        "async_deinit()\n");

# endif

        async_deinit();

    }

    key = destructor_key.value;

    destructor_key.sane = -1;

    CRYPTO_THREAD_cleanup_local(&key);

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "rand_cleanup_int()\n");

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "conf_modules_free_int()\n");

#ifndef OPENSSL_NO_ENGINE

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "engine_cleanup_int()\n");

#endif

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "crypto_cleanup_all_ex_data_int()\n");

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "bio_sock_cleanup_int()\n");

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "bio_cleanup()\n");

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "evp_cleanup_int()\n");

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "obj_cleanup_int()\n");

    fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "

                    "err_cleanup()\n");

#endif

    /*

     * Note that cleanup order is important:

     * - rand_cleanup_int could call an ENGINE's RAND cleanup function so

     * must be called before engine_cleanup_int()

     * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up

     * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().

     * - conf_modules_free_int() can end up in ENGINE code so must be called

     * before engine_cleanup_int()

     * - ENGINEs and additional EVP algorithms might use added OIDs names so

     * obj_cleanup_int() must be called last

     */

    rand_cleanup_int();

    rand_drbg_cleanup_int();

    conf_modules_free_int();

#ifndef OPENSSL_NO_ENGINE

    engine_cleanup_int();

#endif

    ossl_store_cleanup_int();

    crypto_cleanup_all_ex_data_int();

    bio_cleanup();

    evp_cleanup_int();

    obj_cleanup_int();

    err_cleanup();

    CRYPTO_secure_malloc_done();

    base_inited = 0;

}

/*

 * If this function is called with a non NULL settings value then it must be

 * called prior to any threads making calls to any OpenSSL functions,

 * i.e. passing a non-null settings value is assumed to be single-threaded.

 */

int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)

{

    if (stopped) {

        if (!(opts & OPENSSL_INIT_BASE_ONLY))

            CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);

        return 0;

    }

    /*

     * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the

     * *only* option specified.  With that option we return immediately after

     * doing the requested limited initialization.  Note that

     * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()

     * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with

     * base already initialized this is a harmless NOOP.

     *

     * If we remain the only caller of err_shelve_state() the recursion should

     * perhaps be removed, but if in doubt, it can be left in place.

     */

    if (!RUN_ONCE(&base, ossl_init_base))

        return 0;

    if (opts & OPENSSL_INIT_BASE_ONLY)

        return 1;

    /*

     * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls

     * should not have the side-effect of setting up exit handlers, and

     * therefore, this code block is below the INIT_BASE_ONLY-conditioned early

     * return above.

     */

    if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {

        if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,

                          ossl_init_register_atexit))

            return 0;

    } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {

        return 0;

    }

    if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))

        return 0;

    if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)

            && !RUN_ONCE_ALT(&load_crypto_strings,

                             ossl_init_no_load_crypto_strings,

                             ossl_init_load_crypto_strings))

        return 0;

    if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)

            && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))

        return 0;

    if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)

            && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,

                             ossl_init_add_all_ciphers))

        return 0;

    if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)

            && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))

        return 0;

    if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)

            && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,

                             ossl_init_add_all_digests))

        return 0;

    if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)

            && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))

        return 0;

    if ((opts & OPENSSL_INIT_ATFORK)

            && !openssl_init_fork_handlers())

        return 0;

    if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)

            && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))

        return 0;

    if (opts & OPENSSL_INIT_LOAD_CONFIG) {

        int ret;

        CRYPTO_THREAD_write_lock(init_lock);

        conf_settings = settings;

        ret = RUN_ONCE(&config, ossl_init_config);

        conf_settings = NULL;

        CRYPTO_THREAD_unlock(init_lock);

        if (ret <= 0)

            return 0;

    }

    if ((opts & OPENSSL_INIT_ASYNC)

            && !RUN_ONCE(&async, ossl_init_async))

        return 0;

#ifndef OPENSSL_NO_ENGINE

    if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)

            && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))

        return 0;

# if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_DEVCRYPTOENG)

    if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)

            && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))

        return 0;

# endif

# ifndef OPENSSL_NO_RDRAND

    if ((opts & OPENSSL_INIT_ENGINE_RDRAND)

            && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))

        return 0;

# endif

    if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)

            && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))

        return 0;

# ifndef OPENSSL_NO_STATIC_ENGINE

#  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)

    if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)

            && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))

        return 0;

#  endif

#  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)

    if ((opts & OPENSSL_INIT_ENGINE_CAPI)

            && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))

        return 0;

#  endif

#  if !defined(OPENSSL_NO_AFALGENG)

    if ((opts & OPENSSL_INIT_ENGINE_AFALG)

            && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))

        return 0;

#  endif

# endif

    if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN

                | OPENSSL_INIT_ENGINE_OPENSSL

                | OPENSSL_INIT_ENGINE_AFALG)) {

        ENGINE_register_all_complete();

    }

#endif

#ifndef OPENSSL_NO_COMP

    if ((opts & OPENSSL_INIT_ZLIB)

            && !RUN_ONCE(&zlib, ossl_init_zlib))

        return 0;

#endif

    return 1;

}

int OPENSSL_atexit(void (*handler)(void))

{

    OPENSSL_INIT_STOP *newhand;

#if !defined(OPENSSL_USE_NODELETE)\

    && !defined(OPENSSL_NO_PINSHARED)

    {

        union {

            void *sym;

            void (*func)(void);

        } handlersym;

        handlersym.func = handler;

# if defined(DSO_WIN32) && !defined(_WIN32_WCE)

        {

            HMODULE handle = NULL;

            BOOL ret;

            /*

             * We don't use the DSO route for WIN32 because there is a better

             * way

             */

            ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS

                                    | GET_MODULE_HANDLE_EX_FLAG_PIN,

                                    handlersym.sym, &handle);

            if (!ret)

                return 0;

        }

# elif !defined(DSO_NONE)

        /*

         * Deliberately leak a reference to the handler. This will force the

         * library/code containing the handler to remain loaded until we run the

         * atexit handler. If -znodelete has been used then this is

         * unnecessary.

         */

        {

            DSO *dso = NULL;

            ERR_set_mark();

            dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);

#  ifdef OPENSSL_INIT_DEBUG

            fprintf(stderr,

                    "OPENSSL_INIT: OPENSSL_atexit: obtained DSO reference? %s\n",

                    (dso == NULL ? "No!" : "Yes."));

            /* See same code above in ossl_init_base() for an explanation. */

#  endif

            DSO_free(dso);

            ERR_pop_to_mark();

        }

# endif

    }

#endif

    if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {

        CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);

        return 0;

    }

    newhand->handler = handler;

    newhand->next = stop_handlers;

    stop_handlers = newhand;

    return 1;

}

#ifdef OPENSSL_SYS_UNIX

/*

 * The following three functions are for OpenSSL developers.  This is

 * where we set/reset state across fork (called via pthread_atfork when

 * it exists, or manually by the application when it doesn't).

 *

 * WARNING!  If you put code in either OPENSSL_fork_parent or

 * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-

 * safe.  See this link, for example:

 *      http://man7.org/linux/man-pages/man7/signal-safety.7.html

 */

void OPENSSL_fork_prepare(void)

{

}

void OPENSSL_fork_parent(void)

{

}

void OPENSSL_fork_child(void)

{

}

#endif