Unified - adapt the generation of modes assembler to use GENERATE
[openssl.git] / crypto / init.c
1 /*
2  * Written by Matt Caswell for the OpenSSL project.
3  */
4 /* ====================================================================
5  * Copyright (c) 2016 The OpenSSL Project.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  *
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the
17  *    distribution.
18  *
19  * 3. All advertising materials mentioning features or use of this
20  *    software must display the following acknowledgment:
21  *    "This product includes software developed by the OpenSSL Project
22  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
23  *
24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25  *    endorse or promote products derived from this software without
26  *    prior written permission. For written permission, please contact
27  *    openssl-core@openssl.org.
28  *
29  * 5. Products derived from this software may not be called "OpenSSL"
30  *    nor may "OpenSSL" appear in their names without prior written
31  *    permission of the OpenSSL Project.
32  *
33  * 6. Redistributions of any form whatsoever must retain the following
34  *    acknowledgment:
35  *    "This product includes software developed by the OpenSSL Project
36  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
37  *
38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49  * OF THE POSSIBILITY OF SUCH DAMAGE.
50  * ====================================================================
51  *
52  * This product includes cryptographic software written by Eric Young
53  * (eay@cryptsoft.com).  This product includes software written by Tim
54  * Hudson (tjh@cryptsoft.com).
55  *
56  */
57
58 #include <internal/threads.h>
59 #include <internal/cryptlib_int.h>
60 #include <openssl/err.h>
61 #include <openssl/rand.h>
62 #include <openssl/evp.h>
63 #include <internal/evp_int.h>
64 #include <internal/conf.h>
65 #include <internal/async.h>
66 #ifndef OPENSSL_NO_ENGINE
67 #include <internal/engine.h>
68 #endif
69 #include <openssl/comp.h>
70 #include <internal/err.h>
71 #include <stdlib.h>
72 #include <assert.h>
73
74 static int stopped = 0;
75
76 static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
77
78 static CRYPTO_THREAD_LOCAL threadstopkey;
79
80 static void ossl_init_thread_stop_wrap(void *local)
81 {
82     ossl_init_thread_stop((struct thread_local_inits_st *)local);
83 }
84
85 static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
86 {
87     struct thread_local_inits_st *local =
88         CRYPTO_THREAD_get_local(&threadstopkey);
89
90     if (local == NULL && alloc) {
91         local = OPENSSL_zalloc(sizeof *local);
92         CRYPTO_THREAD_set_local(&threadstopkey, local);
93     }
94     if (!alloc) {
95         CRYPTO_THREAD_set_local(&threadstopkey, NULL);
96     }
97
98     return local;
99 }
100
101 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
102 struct ossl_init_stop_st {
103     void (*handler)(void);
104     OPENSSL_INIT_STOP *next;
105 };
106
107 static OPENSSL_INIT_STOP *stop_handlers = NULL;
108 static CRYPTO_RWLOCK *init_lock = NULL;
109
110 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
111 static int base_inited = 0;
112 static void ossl_init_base(void)
113 {
114 #ifdef OPENSSL_INIT_DEBUG
115     fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
116 #endif
117     /*
118      * We use a dummy thread local key here. We use the destructor to detect
119      * when the thread is going to stop (where that feature is available)
120      */
121     CRYPTO_THREAD_init_local(&threadstopkey, ossl_init_thread_stop_wrap);
122 #ifndef OPENSSL_SYS_UEFI
123     atexit(OPENSSL_cleanup);
124 #endif
125     init_lock = CRYPTO_THREAD_lock_new();
126     OPENSSL_cpuid_setup();
127     base_inited = 1;
128 }
129
130 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
131 static int load_crypto_strings_inited = 0;
132 static void ossl_init_no_load_crypto_strings(void)
133 {
134     /* Do nothing in this case */
135     return;
136 }
137
138 static void ossl_init_load_crypto_strings(void)
139 {
140     /*
141      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
142      * pulling in all the error strings during static linking
143      */
144 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
145 # ifdef OPENSSL_INIT_DEBUG
146     fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
147                     "err_load_crypto_strings_intern()\n");
148 # endif
149     err_load_crypto_strings_intern();
150 #endif
151     load_crypto_strings_inited = 1;
152 }
153
154 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
155 static void ossl_init_add_all_ciphers(void)
156 {
157     /*
158      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
159      * pulling in all the ciphers during static linking
160      */
161 #ifndef OPENSSL_NO_AUTOALGINIT
162 # ifdef OPENSSL_INIT_DEBUG
163     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
164                     "openssl_add_all_ciphers_internal()\n");
165 # endif
166     openssl_add_all_ciphers_internal();
167 # ifndef OPENSSL_NO_ENGINE
168 #  if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV)
169     ENGINE_setup_bsd_cryptodev();
170 #  endif
171 # endif
172 #endif
173 }
174
175 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
176 static void ossl_init_add_all_digests(void)
177 {
178     /*
179      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
180      * pulling in all the ciphers during static linking
181      */
182 #ifndef OPENSSL_NO_AUTOALGINIT
183 # ifdef OPENSSL_INIT_DEBUG
184     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
185                     "openssl_add_all_digests_internal()\n");
186 # endif
187     openssl_add_all_digests_internal();
188 # ifndef OPENSSL_NO_ENGINE
189 #  if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV)
190     ENGINE_setup_bsd_cryptodev();
191 #  endif
192 # endif
193 #endif
194 }
195
196 static void ossl_init_no_add_algs(void)
197 {
198     /* Do nothing */
199     return;
200 }
201
202 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
203 static int config_inited = 0;
204 static const char *config_filename;
205 static void ossl_init_config(void)
206 {
207 #ifdef OPENSSL_INIT_DEBUG
208     fprintf(stderr,
209             "OPENSSL_INIT: ossl_init_config: openssl_config_internal(%s)\n",
210             config_filename==NULL?"NULL":config_filename);
211 #endif
212     openssl_config_internal(config_filename);
213     config_inited = 1;
214 }
215 static void ossl_init_no_config(void)
216 {
217 #ifdef OPENSSL_INIT_DEBUG
218     fprintf(stderr,
219             "OPENSSL_INIT: ossl_init_config: openssl_no_config_internal()\n");
220 #endif
221     openssl_no_config_internal();
222     config_inited = 1;
223 }
224
225 #ifndef OPENSSL_NO_ASYNC
226 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
227 static int async_inited = 0;
228 static void ossl_init_async(void)
229 {
230 #ifdef OPENSSL_INIT_DEBUG
231     fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
232 #endif
233     async_init();
234     async_inited = 1;
235 }
236 #endif
237
238 #ifndef OPENSSL_NO_ENGINE
239 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
240 static void ossl_init_engine_openssl(void)
241 {
242 # ifdef OPENSSL_INIT_DEBUG
243     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
244                     "engine_load_openssl_internal()\n");
245 # endif
246     engine_load_openssl_internal();
247 }
248 # if !defined(OPENSSL_NO_HW) && \
249     (defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV))
250 static CRYPTO_ONCE engine_cryptodev = CRYPTO_ONCE_STATIC_INIT;
251 static void ossl_init_engine_cryptodev(void)
252 {
253 #  ifdef OPENSSL_INIT_DEBUG
254     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_cryptodev: "
255                     "engine_load_cryptodev_internal()\n");
256 #  endif
257     engine_load_cryptodev_internal();
258 }
259 # endif
260
261 # ifndef OPENSSL_NO_RDRAND
262 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
263 static void ossl_init_engine_rdrand(void)
264 {
265 #  ifdef OPENSSL_INIT_DEBUG
266     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
267                     "engine_load_rdrand_internal()\n");
268 #  endif
269     engine_load_rdrand_internal();
270 }
271 # endif
272 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
273 static void ossl_init_engine_dynamic(void)
274 {
275 # ifdef OPENSSL_INIT_DEBUG
276     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
277                     "engine_load_dynamic_internal()\n");
278 # endif
279     engine_load_dynamic_internal();
280 }
281 # ifndef OPENSSL_NO_STATIC_ENGINE
282 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
283 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
284 static void ossl_init_engine_padlock(void)
285 {
286 #   ifdef OPENSSL_INIT_DEBUG
287     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
288                     "engine_load_padlock_internal()\n");
289 #   endif
290     engine_load_padlock_internal();
291 }
292 #  endif
293 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
294 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
295 static void ossl_init_engine_capi(void)
296 {
297 #   ifdef OPENSSL_INIT_DEBUG
298     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
299                     "engine_load_capi_internal()\n");
300 #   endif
301     engine_load_capi_internal();
302 }
303 #  endif
304 static CRYPTO_ONCE engine_dasync = CRYPTO_ONCE_STATIC_INIT;
305 static void ossl_init_engine_dasync(void)
306 {
307 # ifdef OPENSSL_INIT_DEBUG
308     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dasync: "
309                     "engine_load_dasync_internal()\n");
310 # endif
311     engine_load_dasync_internal();
312 }
313 #  if !defined(OPENSSL_NO_AFALGENG)
314 static OPENSSL_INIT_ONCE engine_afalg = OPENSSL_INIT_ONCE_STATIC_INIT;
315 static void ossl_init_engine_afalg(void)
316 {
317 #   ifdef OPENSSL_INIT_DEBUG
318     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "
319                     "engine_load_afalg_internal()\n");
320 #   endif
321     engine_load_afalg_internal();
322 }
323 #  endif
324 # endif
325 #endif
326
327 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
328 static int zlib_inited = 0;
329 static void ossl_init_zlib(void)
330 {
331     /* Do nothing - we need to know about this for the later cleanup */
332     zlib_inited = 1;
333 }
334
335 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
336 {
337     /* Can't do much about this */
338     if (locals == NULL)
339         return;
340
341 #ifndef OPENSSL_NO_ASYNC
342     if (locals->async) {
343 #ifdef OPENSSL_INIT_DEBUG
344         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
345                         "ASYNC_cleanup_thread()\n");
346 #endif
347         ASYNC_cleanup_thread();
348     }
349 #endif
350
351     if (locals->err_state) {
352 #ifdef OPENSSL_INIT_DEBUG
353         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
354                         "ERR_remove_thread_state()\n");
355 #endif
356         ERR_remove_thread_state();
357     }
358
359     OPENSSL_free(locals);
360 }
361
362 void OPENSSL_thread_stop(void)
363 {
364     ossl_init_thread_stop(
365         (struct thread_local_inits_st *)ossl_init_get_thread_local(0));
366 }
367
368 int ossl_init_thread_start(uint64_t opts)
369 {
370     struct thread_local_inits_st *locals = ossl_init_get_thread_local(1);
371
372     if (locals == NULL)
373         return 0;
374
375     if (opts & OPENSSL_INIT_THREAD_ASYNC) {
376 #ifdef OPENSSL_INIT_DEBUG
377         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
378                         "marking thread for async\n");
379 #endif
380         locals->async = 1;
381     }
382
383     if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
384 #ifdef OPENSSL_INIT_DEBUG
385         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
386                         "marking thread for err_state\n");
387 #endif
388         locals->err_state = 1;
389     }
390
391     return 1;
392 }
393
394 void OPENSSL_cleanup(void)
395 {
396     OPENSSL_INIT_STOP *currhandler, *lasthandler;
397
398     /* If we've not been inited then no need to deinit */
399     if (!base_inited)
400         return;
401
402     /* Might be explicitly called and also by atexit */
403     if (stopped)
404         return;
405     stopped = 1;
406
407     /*
408      * Thread stop may not get automatically called by the thread library for
409      * the very last thread in some situations, so call it directly.
410      */
411     ossl_init_thread_stop(ossl_init_get_thread_local(0));
412
413     currhandler = stop_handlers;
414     while (currhandler != NULL) {
415         currhandler->handler();
416         lasthandler = currhandler;
417         currhandler = currhandler->next;
418         OPENSSL_free(lasthandler);
419     }
420     stop_handlers = NULL;
421
422     CRYPTO_THREAD_lock_free(init_lock);
423
424     /*
425      * We assume we are single-threaded for this function, i.e. no race
426      * conditions for the various "*_inited" vars below.
427      */
428
429     if (zlib_inited) {
430 #ifdef OPENSSL_INIT_DEBUG
431         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
432                         "COMP_zlib_cleanup()\n");
433 #endif
434         COMP_zlib_cleanup();
435     }
436
437 #ifndef OPENSSL_NO_ASYNC
438     if (async_inited) {
439 # ifdef OPENSSL_INIT_DEBUG
440         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
441                         "async_deinit()\n");
442 # endif
443         async_deinit();
444     }
445 #endif
446
447     if (load_crypto_strings_inited) {
448 #ifdef OPENSSL_INIT_DEBUG
449         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
450                         "ERR_free_strings()\n");
451 #endif
452         ERR_free_strings();
453     }
454
455     CRYPTO_THREAD_cleanup_local(&threadstopkey);
456
457 #ifdef OPENSSL_INIT_DEBUG
458     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
459                     "ENGINE_cleanup()\n");
460     fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
461                     "CRYPTO_cleanup_all_ex_data()\n");
462     fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
463                     "EVP_cleanup()\n");
464     fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
465                     "CONF_modules_free()\n");
466     fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
467                     "RAND_cleanup()\n");
468
469 #endif
470     ENGINE_cleanup();
471     CRYPTO_cleanup_all_ex_data();
472     EVP_cleanup();
473     CONF_modules_free();
474     RAND_cleanup();
475     base_inited = 0;
476 }
477
478 /*
479  * If this function is called with a non NULL settings value then it must be
480  * called prior to any threads making calls to any OpenSSL functions,
481  * i.e. passing a non-null settings value is assumed to be single-threaded.
482  */
483 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
484 {
485     static int stoperrset = 0;
486
487     if (stopped) {
488         if (!stoperrset) {
489             /*
490              * We only ever set this once to avoid getting into an infinite
491              * loop where the error system keeps trying to init and fails so
492              * sets an error etc
493              */
494             stoperrset = 1;
495             CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
496         }
497         return 0;
498     }
499
500     if (!CRYPTO_THREAD_run_once(&base, ossl_init_base))
501         return 0;
502
503     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
504             && !CRYPTO_THREAD_run_once(&load_crypto_strings,
505                                        ossl_init_no_load_crypto_strings))
506         return 0;
507
508     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
509             && !CRYPTO_THREAD_run_once(&load_crypto_strings,
510                                        ossl_init_load_crypto_strings))
511         return 0;
512
513     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
514             && !CRYPTO_THREAD_run_once(&add_all_ciphers, ossl_init_no_add_algs))
515         return 0;
516
517     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
518             && !CRYPTO_THREAD_run_once(&add_all_ciphers,
519                                        ossl_init_add_all_ciphers))
520         return 0;
521
522     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
523             && !CRYPTO_THREAD_run_once(&add_all_digests, ossl_init_no_add_algs))
524         return 0;
525
526     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
527             && !CRYPTO_THREAD_run_once(&add_all_digests,
528                                        ossl_init_add_all_digests))
529         return 0;
530
531     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
532             && !CRYPTO_THREAD_run_once(&config, ossl_init_no_config))
533         return 0;
534
535     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
536         int ret;
537         CRYPTO_THREAD_write_lock(init_lock);
538         config_filename = (settings == NULL) ? NULL : settings->config_name;
539         ret = CRYPTO_THREAD_run_once(&config, ossl_init_config);
540         CRYPTO_THREAD_unlock(init_lock);
541         if (!ret)
542             return 0;
543     }
544
545 #ifndef OPENSSL_NO_ASYNC
546     if ((opts & OPENSSL_INIT_ASYNC)
547             && !CRYPTO_THREAD_run_once(&async, ossl_init_async))
548         return 0;
549 #endif
550 #ifndef OPENSSL_NO_ENGINE
551     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
552             && !CRYPTO_THREAD_run_once(&engine_openssl,
553                                        ossl_init_engine_openssl))
554         return 0;
555 # if !defined(OPENSSL_NO_HW) && \
556     (defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV))
557     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
558             && !CRYPTO_THREAD_run_once(&engine_cryptodev,
559                                        ossl_init_engine_cryptodev))
560         return 0;
561 # endif
562 # ifndef OPENSSL_NO_RDRAND
563     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
564             && !CRYPTO_THREAD_run_once(&engine_rdrand, ossl_init_engine_rdrand))
565         return 0;
566 # endif
567     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
568             && !CRYPTO_THREAD_run_once(&engine_dynamic,
569                                        ossl_init_engine_dynamic))
570         return 0;
571 # ifndef OPENSSL_NO_STATIC_ENGINE
572 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
573     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
574             && CRYPTO_THREAD_run_once(&engine_padlock,
575                                       ossl_init_engine_padlock))
576         return 0;
577 #  endif
578 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
579     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
580             && CRYPTO_THREAD_run_once(&engine_capi, ossl_init_engine_capi))
581         return 0;
582 #  endif
583     if ((opts & OPENSSL_INIT_ENGINE_DASYNC)
584             && !CRYPTO_THREAD_run_once(&engine_dasync, ossl_init_engine_dasync))
585         return 0;
586 #  if !defined(OPENSSL_NO_AFALGENG)
587     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
588             && !CRYPTO_THREAD_run_once(&engine_afalg, ossl_init_engine_afalg))
589         return 0;
590 #  endif
591 # endif
592     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
593                 | OPENSSL_INIT_ENGINE_DASYNC | OPENSSL_INIT_ENGINE_OPENSSL
594                 | OPENSSL_INIT_ENGINE_AFALG)) {
595         ENGINE_register_all_complete();
596     }
597 #endif
598
599     if ((opts & OPENSSL_INIT_ZLIB)
600             && CRYPTO_THREAD_run_once(&zlib, ossl_init_zlib))
601         return 0;
602
603     return 1;
604 }
605
606 int OPENSSL_atexit(void (*handler)(void))
607 {
608     OPENSSL_INIT_STOP *newhand;
609
610     newhand = OPENSSL_malloc(sizeof(*newhand));
611     if (newhand == NULL)
612         return 0;
613
614     newhand->handler = handler;
615     newhand->next = stop_handlers;
616     stop_handlers = newhand;
617
618     return 1;
619 }
620
621