1 /* crypto/ex_data.c */
2
3 /*
4 * Overhaul notes;
5 *
6 * This code is now *mostly* thread-safe. It is now easier to understand in what
7 * ways it is safe and in what ways it is not, which is an improvement. Firstly,
8 * all per-class stacks and index-counters for ex_data are stored in the same
9 * global LHASH table (keyed by class). This hash table uses locking for all
10 * access with the exception of CRYPTO_cleanup_all_ex_data(), which must only be
11 * called when no other threads can possibly race against it (even if it was
12 * locked, the race would mean it's possible the hash table might have been
13 * recreated after the cleanup). As classes can only be added to the hash table,
14 * and within each class, the stack of methods can only be incremented, the
15 * locking mechanics are simpler than they would otherwise be. For example, the
16 * new/dup/free ex_data functions will lock the hash table, copy the method
17 * pointers it needs from the relevant class, then unlock the hash table before
18 * actually applying those method pointers to the task of the new/dup/free
19 * operations. As they can't be removed from the method-stack, only
20 * supplemented, there's no race conditions associated with using them outside
21 * the lock. The get/set_ex_data functions are not locked because they do not
22 * involve this global state at all - they operate directly with a previously
23 * obtained per-class method index and a particular "ex_data" variable. These
24 * variables are usually instantiated per-context (eg. each RSA structure has
25 * one) so locking on read/write access to that variable can be locked locally
26 * if required (eg. using the "RSA" lock to synchronise access to a
27 * per-RSA-structure ex_data variable if required).
28 * [Geoff]
29 */
30
31 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
32 * All rights reserved.
33 *
34 * This package is an SSL implementation written
35 * by Eric Young (eay@cryptsoft.com).
36 * The implementation was written so as to conform with Netscapes SSL.
37 *
38 * This library is free for commercial and non-commercial use as long as
39 * the following conditions are aheared to. The following conditions
40 * apply to all code found in this distribution, be it the RC4, RSA,
41 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
42 * included with this distribution is covered by the same copyright terms
43 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
44 *
45 * Copyright remains Eric Young's, and as such any Copyright notices in
46 * the code are not to be removed.
47 * If this package is used in a product, Eric Young should be given attribution
48 * as the author of the parts of the library used.
49 * This can be in the form of a textual message at program startup or
50 * in documentation (online or textual) provided with the package.
51 *
52 * Redistribution and use in source and binary forms, with or without
53 * modification, are permitted provided that the following conditions
54 * are met:
55 * 1. Redistributions of source code must retain the copyright
56 * notice, this list of conditions and the following disclaimer.
57 * 2. Redistributions in binary form must reproduce the above copyright
58 * notice, this list of conditions and the following disclaimer in the
59 * documentation and/or other materials provided with the distribution.
60 * 3. All advertising materials mentioning features or use of this software
61 * must display the following acknowledgement:
62 * "This product includes cryptographic software written by
63 * Eric Young (eay@cryptsoft.com)"
64 * The word 'cryptographic' can be left out if the rouines from the library
65 * being used are not cryptographic related :-).
66 * 4. If you include any Windows specific code (or a derivative thereof) from
67 * the apps directory (application code) you must include an acknowledgement:
68 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
69 *
70 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
71 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
72 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
73 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
74 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
75 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
76 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
77 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
78 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
79 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
80 * SUCH DAMAGE.
81 *
82 * The licence and distribution terms for any publically available version or
83 * derivative of this code cannot be changed. i.e. this code cannot simply be
84 * copied and put under another distribution licence
85 * [including the GNU Public Licence.]
86 */
87 /* ====================================================================
88 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
89 *
90 * Redistribution and use in source and binary forms, with or without
91 * modification, are permitted provided that the following conditions
92 * are met:
93 *
94 * 1. Redistributions of source code must retain the above copyright
95 * notice, this list of conditions and the following disclaimer.
96 *
97 * 2. Redistributions in binary form must reproduce the above copyright
98 * notice, this list of conditions and the following disclaimer in
99 * the documentation and/or other materials provided with the
100 * distribution.
101 *
102 * 3. All advertising materials mentioning features or use of this
103 * software must display the following acknowledgment:
104 * "This product includes software developed by the OpenSSL Project
105 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
106 *
107 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
108 * endorse or promote products derived from this software without
109 * prior written permission. For written permission, please contact
110 * openssl-core@openssl.org.
111 *
112 * 5. Products derived from this software may not be called "OpenSSL"
113 * nor may "OpenSSL" appear in their names without prior written
114 * permission of the OpenSSL Project.
115 *
116 * 6. Redistributions of any form whatsoever must retain the following
117 * acknowledgment:
118 * "This product includes software developed by the OpenSSL Project
119 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
120 *
121 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
122 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
123 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
124 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
125 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
126 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
127 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
128 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
129 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
130 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
131 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
132 * OF THE POSSIBILITY OF SUCH DAMAGE.
133 * ====================================================================
134 *
135 * This product includes cryptographic software written by Eric Young
136 * (eay@cryptsoft.com). This product includes software written by Tim
137 * Hudson (tjh@cryptsoft.com).
138 *
139 */
140
141 #include "cryptlib.h"
142 #include <openssl/lhash.h>
143
144 /* What an "implementation of ex_data functionality" looks like */
145 struct st_CRYPTO_EX_DATA_IMPL
146 {
147 /*********************/
148 /* GLOBAL OPERATIONS */
149 /* Return a new class index */
150 int (*cb_new_class)(void);
151 /* Cleanup all state used by the implementation */
152 void (*cb_cleanup)(void);
153 /************************/
154 /* PER-CLASS OPERATIONS */
155 /* Get a new method index within a class */
156 int (*cb_get_new_index)(int class_index, long argl, void *argp,
157 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
158 CRYPTO_EX_free *free_func);
159 /* Initialise a new CRYPTO_EX_DATA of a given class */
160 int (*cb_new_ex_data)(int class_index, void *obj,
161 CRYPTO_EX_DATA *ad);
162 /* Duplicate a CRYPTO_EX_DATA of a given class onto a copy */
163 int (*cb_dup_ex_data)(int class_index, CRYPTO_EX_DATA *to,
164 CRYPTO_EX_DATA *from);
165 /* Cleanup a CRYPTO_EX_DATA of a given class */
166 void (*cb_free_ex_data)(int class_index, void *obj,
167 CRYPTO_EX_DATA *ad);
168 };
169
170 /* The implementation we use at run-time */
171 static const CRYPTO_EX_DATA_IMPL *impl = NULL;
172
173 /* To call "impl" functions, use this macro rather than referring to 'impl' directly, eg.
174 * EX_IMPL(get_new_index)(...); */
175 #define EX_IMPL(a) impl->cb_##a
176
177 /* Predeclare the "default" ex_data implementation */
178 static int int_new_class(void);
179 static void int_cleanup(void);
180 static int int_get_new_index(int class_index, long argl, void *argp,
181 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
182 CRYPTO_EX_free *free_func);
183 static int int_new_ex_data(int class_index, void *obj,
184 CRYPTO_EX_DATA *ad);
185 static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
186 CRYPTO_EX_DATA *from);
187 static void int_free_ex_data(int class_index, void *obj,
188 CRYPTO_EX_DATA *ad);
189 static CRYPTO_EX_DATA_IMPL impl_default =
190 {
191 int_new_class,
192 int_cleanup,
193 int_get_new_index,
194 int_new_ex_data,
195 int_dup_ex_data,
196 int_free_ex_data
197 };
198
199 /* Internal function that checks whether "impl" is set and if not, sets it to
200 * the default. */
201 static void impl_check(void)
202 {
203 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
204 if(!impl)
205 impl = &impl_default;
206 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
207 }
208 /* A macro wrapper for impl_check that first uses a non-locked test before
209 * invoking the function (which checks again inside a lock). */
210 #define IMPL_CHECK if(!impl) impl_check();
211
212 /* API functions to get/set the "ex_data" implementation */
213 const CRYPTO_EX_DATA_IMPL *CRYPTO_get_ex_data_implementation(void)
214 {
215 IMPL_CHECK
216 return impl;
217 }
218 int CRYPTO_set_ex_data_implementation(const CRYPTO_EX_DATA_IMPL *i)
219 {
220 int toret = 0;
221 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
222 if(!impl)
223 {
224 impl = i;
225 toret = 1;
226 }
227 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
228 return toret;
229 }
230
231 /****************************************************************************/
232 /* Interal (default) implementation of "ex_data" support. API functions are
233 * further down. */
234
235 /* The type that represents what each "class" used to implement locally. A STACK
236 * of CRYPTO_EX_DATA_FUNCS plus a index-counter. The 'class_index' is the global
237 * value representing the class that is used to distinguish these items. */
238 typedef struct st_ex_class_item {
239 int class_index;
240 STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth;
241 int meth_num;
242 } EX_CLASS_ITEM;
243
244 /* When assigning new class indexes, this is our counter */
245 static int ex_class = CRYPTO_EX_INDEX_USER;
246
247 /* The global hash table of EX_CLASS_ITEM items */
248 DECLARE_LHASH_OF(EX_CLASS_ITEM);
249 static LHASH_OF(EX_CLASS_ITEM) *ex_data = NULL;
250
251 /* The callbacks required in the "ex_data" hash table */
252 static unsigned long ex_class_item_hash(const EX_CLASS_ITEM *a)
253 {
254 return a->class_index;
255 }
256 static IMPLEMENT_LHASH_HASH_FN(ex_class_item, EX_CLASS_ITEM)
257
258 static int ex_class_item_cmp(const EX_CLASS_ITEM *a, const EX_CLASS_ITEM *b)
259 {
260 return a->class_index - b->class_index;
261 }
262 static IMPLEMENT_LHASH_COMP_FN(ex_class_item, EX_CLASS_ITEM)
263
264 /* Internal functions used by the "impl_default" implementation to access the
265 * state */
266
267 static int ex_data_check(void)
268 {
269 int toret = 1;
270 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
271 if(!ex_data
272 && (ex_data = lh_EX_CLASS_ITEM_new()) == NULL)
273 toret = 0;
274 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
275 return toret;
276 }
277 /* This macros helps reduce the locking from repeated checks because the
278 * ex_data_check() function checks ex_data again inside a lock. */
279 #define EX_DATA_CHECK(iffail) if(!ex_data && !ex_data_check()) {iffail}
280
281 /* This "inner" callback is used by the callback function that follows it */
282 static void def_cleanup_util_cb(CRYPTO_EX_DATA_FUNCS *funcs)
283 {
284 OPENSSL_free(funcs);
285 }
286
287 /* This callback is used in lh_doall to destroy all EX_CLASS_ITEM values from
288 * "ex_data" prior to the ex_data hash table being itself destroyed. Doesn't do
289 * any locking. */
290 static void def_cleanup_cb(void *a_void)
291 {
292 EX_CLASS_ITEM *item = (EX_CLASS_ITEM *)a_void;
293 sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, def_cleanup_util_cb);
294 OPENSSL_free(item);
295 }
296
297 /* Return the EX_CLASS_ITEM from the "ex_data" hash table that corresponds to a
298 * given class. Handles locking. */
299 static EX_CLASS_ITEM *def_get_class(int class_index)
300 {
301 EX_CLASS_ITEM d, *p, *gen;
302 EX_DATA_CHECK(return NULL;)
303 d.class_index = class_index;
304 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
305 p = lh_EX_CLASS_ITEM_retrieve(ex_data, &d);
306 if(!p)
307 {
308 gen = OPENSSL_malloc(sizeof(EX_CLASS_ITEM));
309 if(gen)
310 {
311 gen->class_index = class_index;
312 gen->meth_num = 0;
313 gen->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null();
314 if(!gen->meth)
315 OPENSSL_free(gen);
316 else
317 {
318 /* Because we're inside the ex_data lock, the
319 * return value from the insert will be NULL */
320 (void)lh_EX_CLASS_ITEM_insert(ex_data, gen);
321 p = gen;
322 }
323 }
324 }
325 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
326 if(!p)
327 CRYPTOerr(CRYPTO_F_DEF_GET_CLASS,ERR_R_MALLOC_FAILURE);
328 return p;
329 }
330
331 /* Add a new method to the given EX_CLASS_ITEM and return the corresponding
332 * index (or -1 for error). Handles locking. */
333 static int def_add_index(EX_CLASS_ITEM *item, long argl, void *argp,
334 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
335 CRYPTO_EX_free *free_func)
336 {
337 int toret = -1;
338 CRYPTO_EX_DATA_FUNCS *a = (CRYPTO_EX_DATA_FUNCS *)OPENSSL_malloc(
339 sizeof(CRYPTO_EX_DATA_FUNCS));
340 if(!a)
341 {
342 CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX,ERR_R_MALLOC_FAILURE);
343 return -1;
344 }
345 a->argl=argl;
346 a->argp=argp;
347 a->new_func=new_func;
348 a->dup_func=dup_func;
349 a->free_func=free_func;
350 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
351 while (sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) <= item->meth_num)
352 {
353 if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, NULL))
354 {
355 CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX,ERR_R_MALLOC_FAILURE);
356 OPENSSL_free(a);
357 goto err;
358 }
359 }
360 toret = item->meth_num++;
361 (void)sk_CRYPTO_EX_DATA_FUNCS_set(item->meth, toret, a);
362 err:
363 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
364 return toret;
365 }
366
367 /**************************************************************/
368 /* The functions in the default CRYPTO_EX_DATA_IMPL structure */
369
370 static int int_new_class(void)
371 {
372 int toret;
373 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
374 toret = ex_class++;
375 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
376 return toret;
377 }
378
379 static void int_cleanup(void)
380 {
381 EX_DATA_CHECK(return;)
382 lh_EX_CLASS_ITEM_doall(ex_data, def_cleanup_cb);
383 lh_EX_CLASS_ITEM_free(ex_data);
384 ex_data = NULL;
385 impl = NULL;
386 }
387
388 static int int_get_new_index(int class_index, long argl, void *argp,
389 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
390 CRYPTO_EX_free *free_func)
391 {
392 EX_CLASS_ITEM *item = def_get_class(class_index);
393 if(!item)
394 return -1;
395 return def_add_index(item, argl, argp, new_func, dup_func, free_func);
396 }
397
398 /* Thread-safe by copying a class's array of "CRYPTO_EX_DATA_FUNCS" entries in
399 * the lock, then using them outside the lock. NB: Thread-safety only applies to
400 * the global "ex_data" state (ie. class definitions), not thread-safe on 'ad'
401 * itself. */
402 static int int_new_ex_data(int class_index, void *obj,
403 CRYPTO_EX_DATA *ad)
404 {
405 int mx,i;
406 void *ptr;
407 CRYPTO_EX_DATA_FUNCS **storage = NULL;
408 EX_CLASS_ITEM *item = def_get_class(class_index);
409 if(!item)
410 /* error is already set */
411 return 0;
412 ad->sk = NULL;
413 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
414 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
415 if(mx > 0)
416 {
417 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
418 if(!storage)
419 goto skip;
420 for(i = 0; i < mx; i++)
421 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
422 }
423 skip:
424 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
425 if((mx > 0) && !storage)
426 {
427 CRYPTOerr(CRYPTO_F_INT_NEW_EX_DATA,ERR_R_MALLOC_FAILURE);
428 return 0;
429 }
430 for(i = 0; i < mx; i++)
431 {
432 if(storage[i] && storage[i]->new_func)
433 {
434 ptr = CRYPTO_get_ex_data(ad, i);
435 storage[i]->new_func(obj,ptr,ad,i,
436 storage[i]->argl,storage[i]->argp);
437 }
438 }
439 if(storage)
440 OPENSSL_free(storage);
441 return 1;
442 }
443
444 /* Same thread-safety notes as for "int_new_ex_data" */
445 static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
446 CRYPTO_EX_DATA *from)
447 {
448 int mx, j, i;
449 char *ptr;
450 CRYPTO_EX_DATA_FUNCS **storage = NULL;
451 EX_CLASS_ITEM *item;
452 if(!from->sk)
453 /* 'to' should be "blank" which *is* just like 'from' */
454 return 1;
455 if((item = def_get_class(class_index)) == NULL)
456 return 0;
457 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
458 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
459 j = sk_void_num(from->sk);
460 if(j < mx)
461 mx = j;
462 if(mx > 0)
463 {
464 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
465 if(!storage)
466 goto skip;
467 for(i = 0; i < mx; i++)
468 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
469 }
470 skip:
471 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
472 if((mx > 0) && !storage)
473 {
474 CRYPTOerr(CRYPTO_F_INT_DUP_EX_DATA,ERR_R_MALLOC_FAILURE);
475 return 0;
476 }
477 for(i = 0; i < mx; i++)
478 {
479 ptr = CRYPTO_get_ex_data(from, i);
480 if(storage[i] && storage[i]->dup_func)
481 storage[i]->dup_func(to,from,&ptr,i,
482 storage[i]->argl,storage[i]->argp);
483 CRYPTO_set_ex_data(to,i,ptr);
484 }
485 if(storage)
486 OPENSSL_free(storage);
487 return 1;
488 }
489
490 /* Same thread-safety notes as for "int_new_ex_data" */
491 static void int_free_ex_data(int class_index, void *obj,
492 CRYPTO_EX_DATA *ad)
493 {
494 int mx,i;
495 EX_CLASS_ITEM *item;
496 void *ptr;
497 CRYPTO_EX_DATA_FUNCS **storage = NULL;
498 if((item = def_get_class(class_index)) == NULL)
499 return;
500 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
501 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
502 if(mx > 0)
503 {
504 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
505 if(!storage)
506 goto skip;
507 for(i = 0; i < mx; i++)
508 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
509 }
510 skip:
511 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
512 if((mx > 0) && !storage)
513 {
514 CRYPTOerr(CRYPTO_F_INT_FREE_EX_DATA,ERR_R_MALLOC_FAILURE);
515 return;
516 }
517 for(i = 0; i < mx; i++)
518 {
519 if(storage[i] && storage[i]->free_func)
520 {
521 ptr = CRYPTO_get_ex_data(ad,i);
522 storage[i]->free_func(obj,ptr,ad,i,
523 storage[i]->argl,storage[i]->argp);
524 }
525 }
526 if(storage)
527 OPENSSL_free(storage);
528 if(ad->sk)
529 {
530 sk_void_free(ad->sk);
531 ad->sk=NULL;
532 }
533 }
534
535 /********************************************************************/
536 /* API functions that defer all "state" operations to the "ex_data"
537 * implementation we have set. */
538
539 /* Obtain an index for a new class (not the same as getting a new index within
540 * an existing class - this is actually getting a new *class*) */
541 int CRYPTO_ex_data_new_class(void)
542 {
543 IMPL_CHECK
544 return EX_IMPL(new_class)();
545 }
546
547 /* Release all "ex_data" state to prevent memory leaks. This can't be made
548 * thread-safe without overhauling a lot of stuff, and shouldn't really be
549 * called under potential race-conditions anyway (it's for program shutdown
550 * after all). */
551 void CRYPTO_cleanup_all_ex_data(void)
552 {
553 IMPL_CHECK
554 EX_IMPL(cleanup)();
555 }
556
557 /* Inside an existing class, get/register a new index. */
558 int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp,
559 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
560 CRYPTO_EX_free *free_func)
561 {
562 int ret = -1;
563
564 IMPL_CHECK
565 ret = EX_IMPL(get_new_index)(class_index,
566 argl, argp, new_func, dup_func, free_func);
567 return ret;
568 }
569
570 /* Initialise a new CRYPTO_EX_DATA for use in a particular class - including
571 * calling new() callbacks for each index in the class used by this variable */
572 int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
573 {
574 IMPL_CHECK
575 return EX_IMPL(new_ex_data)(class_index, obj, ad);
576 }
577
578 /* Duplicate a CRYPTO_EX_DATA variable - including calling dup() callbacks for
579 * each index in the class used by this variable */
580 int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
581 CRYPTO_EX_DATA *from)
582 {
583 IMPL_CHECK
584 return EX_IMPL(dup_ex_data)(class_index, to, from);
585 }
586
587 /* Cleanup a CRYPTO_EX_DATA variable - including calling free() callbacks for
588 * each index in the class used by this variable */
589 void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
590 {
591 IMPL_CHECK
592 EX_IMPL(free_ex_data)(class_index, obj, ad);
593 }
594
595 /* For a given CRYPTO_EX_DATA variable, set the value corresponding to a
596 * particular index in the class used by this variable */
597 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val)
598 {
599 int i;
600
601 if (ad->sk == NULL)
602 {
603 if ((ad->sk=sk_void_new_null()) == NULL)
604 {
605 CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
606 return(0);
607 }
608 }
609 i=sk_void_num(ad->sk);
610
611 while (i <= idx)
612 {
613 if (!sk_void_push(ad->sk,NULL))
614 {
615 CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
616 return(0);
617 }
618 i++;
619 }
620 sk_void_set(ad->sk,idx,val);
621 return(1);
622 }
623
624 /* For a given CRYPTO_EX_DATA_ variable, get the value corresponding to a
625 * particular index in the class used by this variable */
626 void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
627 {
628 if (ad->sk == NULL)
629 return(0);
630 else if (idx >= sk_void_num(ad->sk))
631 return(0);
632 else
633 return(sk_void_value(ad->sk,idx));
634 }
635
636 IMPLEMENT_STACK_OF(CRYPTO_EX_DATA_FUNCS)