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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 */
145struct 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 */
171static 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 */
178static int int_new_class(void);
179static void int_cleanup(void);
180static 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);
183static int int_new_ex_data(int class_index, void *obj,
184 CRYPTO_EX_DATA *ad);
185static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
186 CRYPTO_EX_DATA *from);
187static void int_free_ex_data(int class_index, void *obj,
188 CRYPTO_EX_DATA *ad);
189static 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. */
201static 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 */
213const CRYPTO_EX_DATA_IMPL *CRYPTO_get_ex_data_implementation(void)
214 {
215 IMPL_CHECK
216 return impl;
217 }
218int 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. */
238typedef 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 */
245static int ex_class = CRYPTO_EX_INDEX_USER;
246
247/* The global hash table of EX_CLASS_ITEM items */
248static LHASH *ex_data = NULL;
249
250/* The callbacks required in the "ex_data" hash table */
251static unsigned long ex_hash_cb(const void *a_void)
252 {
253 return ((const EX_CLASS_ITEM *)a_void)->class_index;
254 }
255static int ex_cmp_cb(const void *a_void, const void *b_void)
256 {
257 return (((const EX_CLASS_ITEM *)a_void)->class_index -
258 ((const EX_CLASS_ITEM *)b_void)->class_index);
259 }
260
261/* Internal functions used by the "impl_default" implementation to access the
262 * state */
263
264static int ex_data_check(void)
265 {
266 int toret = 1;
267 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
268 if(!ex_data && ((ex_data = lh_new(ex_hash_cb, ex_cmp_cb)) == NULL))
269 toret = 0;
270 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
271 return toret;
272 }
273/* This macros helps reduce the locking from repeated checks because the
274 * ex_data_check() function checks ex_data again inside a lock. */
275#define EX_DATA_CHECK(iffail) if(!ex_data && !ex_data_check()) {iffail}
276
277/* This "inner" callback is used by the callback function that follows it */
278static void def_cleanup_util_cb(CRYPTO_EX_DATA_FUNCS *funcs)
279 {
280 OPENSSL_free(funcs);
281 }
282
283/* This callback is used in lh_doall to destroy all EX_CLASS_ITEM values from
284 * "ex_data" prior to the ex_data hash table being itself destroyed. Doesn't do
285 * any locking. */
286static void def_cleanup_cb(void *a_void)
287 {
288 EX_CLASS_ITEM *item = (EX_CLASS_ITEM *)a_void;
289 sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, def_cleanup_util_cb);
290 OPENSSL_free(item);
291 }
292
293/* Return the EX_CLASS_ITEM from the "ex_data" hash table that corresponds to a
294 * given class. Handles locking. */
295static EX_CLASS_ITEM *def_get_class(int class_index)
296 {
297 EX_CLASS_ITEM d, *p, *gen;
298 EX_DATA_CHECK(return NULL;)
299 d.class_index = class_index;
300 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
301 p = lh_retrieve(ex_data, &d);
302 if(!p)
303 {
304 gen = OPENSSL_malloc(sizeof(EX_CLASS_ITEM));
305 if(gen)
306 {
307 gen->class_index = class_index;
308 gen->meth_num = 0;
309 gen->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null();
310 if(!gen->meth)
311 OPENSSL_free(gen);
312 else
313 {
314 /* Because we're inside the ex_data lock, the
315 * return value from the insert will be NULL */
316 lh_insert(ex_data, gen);
317 p = gen;
318 }
319 }
320 }
321 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
322 if(!p)
323 CRYPTOerr(CRYPTO_F_DEF_GET_CLASS,ERR_R_MALLOC_FAILURE);
324 return p;
325 }
326
327/* Add a new method to the given EX_CLASS_ITEM and return the corresponding
328 * index (or -1 for error). Handles locking. */
329static int def_add_index(EX_CLASS_ITEM *item, long argl, void *argp,
330 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
331 CRYPTO_EX_free *free_func)
332 {
333 int toret = -1;
334 CRYPTO_EX_DATA_FUNCS *a = (CRYPTO_EX_DATA_FUNCS *)OPENSSL_malloc(
335 sizeof(CRYPTO_EX_DATA_FUNCS));
336 if(!a)
337 {
338 CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX,ERR_R_MALLOC_FAILURE);
339 return -1;
340 }
341 a->argl=argl;
342 a->argp=argp;
343 a->new_func=new_func;
344 a->dup_func=dup_func;
345 a->free_func=free_func;
346 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
347 while (sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) <= item->meth_num)
348 {
349 if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, NULL))
350 {
351 CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX,ERR_R_MALLOC_FAILURE);
352 OPENSSL_free(a);
353 goto err;
354 }
355 }
356 toret = item->meth_num++;
357 (void)sk_CRYPTO_EX_DATA_FUNCS_set(item->meth, toret, a);
358err:
359 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
360 return toret;
361 }
362
363/**************************************************************/
364/* The functions in the default CRYPTO_EX_DATA_IMPL structure */
365
366static int int_new_class(void)
367 {
368 int toret;
369 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
370 toret = ex_class++;
371 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
372 return toret;
373 }
374
375static void int_cleanup(void)
376 {
377 EX_DATA_CHECK(return;)
378 lh_doall(ex_data, def_cleanup_cb);
379 lh_free(ex_data);
380 ex_data = NULL;
381 impl = NULL;
382 }
383
384static int int_get_new_index(int class_index, long argl, void *argp,
385 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
386 CRYPTO_EX_free *free_func)
387 {
388 EX_CLASS_ITEM *item = def_get_class(class_index);
389 if(!item)
390 return -1;
391 return def_add_index(item, argl, argp, new_func, dup_func, free_func);
392 }
393
394/* Thread-safe by copying a class's array of "CRYPTO_EX_DATA_FUNCS" entries in
395 * the lock, then using them outside the lock. NB: Thread-safety only applies to
396 * the global "ex_data" state (ie. class definitions), not thread-safe on 'ad'
397 * itself. */
398static int int_new_ex_data(int class_index, void *obj,
399 CRYPTO_EX_DATA *ad)
400 {
401 int mx,i;
402 void *ptr;
403 CRYPTO_EX_DATA_FUNCS **storage = NULL;
404 EX_CLASS_ITEM *item = def_get_class(class_index);
405 if(!item)
406 /* error is already set */
407 return 0;
408 ad->sk = NULL;
409 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
410 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
411 if(mx > 0)
412 {
413 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
414 if(!storage)
415 goto skip;
416 for(i = 0; i < mx; i++)
417 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
418 }
419skip:
420 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
421 if((mx > 0) && !storage)
422 {
423 CRYPTOerr(CRYPTO_F_INT_NEW_EX_DATA,ERR_R_MALLOC_FAILURE);
424 return 0;
425 }
426 for(i = 0; i < mx; i++)
427 {
428 if(storage[i] && storage[i]->new_func)
429 {
430 ptr = CRYPTO_get_ex_data(ad, i);
431 storage[i]->new_func(obj,ptr,ad,i,
432 storage[i]->argl,storage[i]->argp);
433 }
434 }
435 if(storage)
436 OPENSSL_free(storage);
437 return 1;
438 }
439
440/* Same thread-safety notes as for "int_new_ex_data" */
441static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
442 CRYPTO_EX_DATA *from)
443 {
444 int mx, j, i;
445 char *ptr;
446 CRYPTO_EX_DATA_FUNCS **storage = NULL;
447 EX_CLASS_ITEM *item;
448 if(!from->sk)
449 /* 'to' should be "blank" which *is* just like 'from' */
450 return 1;
451 if((item = def_get_class(class_index)) == NULL)
452 return 0;
453 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
454 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
455 j = sk_num(from->sk);
456 if(j < mx)
457 mx = j;
458 if(mx > 0)
459 {
460 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
461 if(!storage)
462 goto skip;
463 for(i = 0; i < mx; i++)
464 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
465 }
466skip:
467 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
468 if((mx > 0) && !storage)
469 {
470 CRYPTOerr(CRYPTO_F_INT_DUP_EX_DATA,ERR_R_MALLOC_FAILURE);
471 return 0;
472 }
473 for(i = 0; i < mx; i++)
474 {
475 ptr = CRYPTO_get_ex_data(from, i);
476 if(storage[i] && storage[i]->dup_func)
477 storage[i]->dup_func(to,from,&ptr,i,
478 storage[i]->argl,storage[i]->argp);
479 CRYPTO_set_ex_data(to,i,ptr);
480 }
481 if(storage)
482 OPENSSL_free(storage);
483 return 1;
484 }
485
486/* Same thread-safety notes as for "int_new_ex_data" */
487static void int_free_ex_data(int class_index, void *obj,
488 CRYPTO_EX_DATA *ad)
489 {
490 int mx,i;
491 EX_CLASS_ITEM *item;
492 void *ptr;
493 CRYPTO_EX_DATA_FUNCS **storage = NULL;
494 if((item = def_get_class(class_index)) == NULL)
495 return;
496 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
497 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
498 if(mx > 0)
499 {
500 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
501 if(!storage)
502 goto skip;
503 for(i = 0; i < mx; i++)
504 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
505 }
506skip:
507 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
508 if((mx > 0) && !storage)
509 {
510 CRYPTOerr(CRYPTO_F_INT_FREE_EX_DATA,ERR_R_MALLOC_FAILURE);
511 return;
512 }
513 for(i = 0; i < mx; i++)
514 {
515 if(storage[i] && storage[i]->free_func)
516 {
517 ptr = CRYPTO_get_ex_data(ad,i);
518 storage[i]->free_func(obj,ptr,ad,i,
519 storage[i]->argl,storage[i]->argp);
520 }
521 }
522 if(storage)
523 OPENSSL_free(storage);
524 if(ad->sk)
525 {
526 sk_free(ad->sk);
527 ad->sk=NULL;
528 }
529 }
530
531/********************************************************************/
532/* API functions that defer all "state" operations to the "ex_data"
533 * implementation we have set. */
534
535/* Obtain an index for a new class (not the same as getting a new index within
536 * an existing class - this is actually getting a new *class*) */
537int CRYPTO_ex_data_new_class(void)
538 {
539 IMPL_CHECK
540 return EX_IMPL(new_class)();
541 }
542
543/* Release all "ex_data" state to prevent memory leaks. This can't be made
544 * thread-safe without overhauling a lot of stuff, and shouldn't really be
545 * called under potential race-conditions anyway (it's for program shutdown
546 * after all). */
547void CRYPTO_cleanup_all_ex_data(void)
548 {
549 IMPL_CHECK
550 EX_IMPL(cleanup)();
551 }
552
553/* Inside an existing class, get/register a new index. */
554int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp,
555 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
556 CRYPTO_EX_free *free_func)
557 {
558 int ret = -1;
559
560 IMPL_CHECK
561 ret = EX_IMPL(get_new_index)(class_index,
562 argl, argp, new_func, dup_func, free_func);
563 return ret;
564 }
565
566/* Initialise a new CRYPTO_EX_DATA for use in a particular class - including
567 * calling new() callbacks for each index in the class used by this variable */
568int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
569 {
570 IMPL_CHECK
571 return EX_IMPL(new_ex_data)(class_index, obj, ad);
572 }
573
574/* Duplicate a CRYPTO_EX_DATA variable - including calling dup() callbacks for
575 * each index in the class used by this variable */
576int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
577 CRYPTO_EX_DATA *from)
578 {
579 IMPL_CHECK
580 return EX_IMPL(dup_ex_data)(class_index, to, from);
581 }
582
583/* Cleanup a CRYPTO_EX_DATA variable - including calling free() callbacks for
584 * each index in the class used by this variable */
585void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
586 {
587 IMPL_CHECK
588 EX_IMPL(free_ex_data)(class_index, obj, ad);
589 }
590
591/* For a given CRYPTO_EX_DATA variable, set the value corresponding to a
592 * particular index in the class used by this variable */
593int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val)
594 {
595 int i;
596
597 if (ad->sk == NULL)
598 {
599 if ((ad->sk=sk_new_null()) == NULL)
600 {
601 CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
602 return(0);
603 }
604 }
605 i=sk_num(ad->sk);
606
607 while (i <= idx)
608 {
609 if (!sk_push(ad->sk,NULL))
610 {
611 CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
612 return(0);
613 }
614 i++;
615 }
616 sk_set(ad->sk,idx,val);
617 return(1);
618 }
619
620/* For a given CRYPTO_EX_DATA_ variable, get the value corresponding to a
621 * particular index in the class used by this variable */
622void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
623 {
624 if (ad->sk == NULL)
625 return(0);
626 else if (idx >= sk_num(ad->sk))
627 return(0);
628 else
629 return(sk_value(ad->sk,idx));
630 }
631
632IMPLEMENT_STACK_OF(CRYPTO_EX_DATA_FUNCS)
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-10-24 14:23:06 +0000