1 /* $OpenBSD: ex_data.c,v 1.20 2018/03/17 16:20:01 beck Exp $ */ 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 <openssl/err.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 /* GLOBAL OPERATIONS */ 148 /* Return a new class index */ 149 int (*cb_new_class)(void); 150 /* Cleanup all state used by the implementation */ 151 void (*cb_cleanup)(void); 152 /************************/ 153 /* PER-CLASS OPERATIONS */ 154 /* Get a new method index within a class */ 155 int (*cb_get_new_index)(int class_index, long argl, void *argp, 156 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, 157 CRYPTO_EX_free *free_func); 158 /* Initialise a new CRYPTO_EX_DATA of a given class */ 159 int (*cb_new_ex_data)(int class_index, void *obj, 160 CRYPTO_EX_DATA *ad); 161 /* Duplicate a CRYPTO_EX_DATA of a given class onto a copy */ 162 int (*cb_dup_ex_data)(int class_index, CRYPTO_EX_DATA *to, 163 CRYPTO_EX_DATA *from); 164 /* Cleanup a CRYPTO_EX_DATA of a given class */ 165 void (*cb_free_ex_data)(int class_index, void *obj, 166 CRYPTO_EX_DATA *ad); 167 }; 168 169 /* The implementation we use at run-time */ 170 static const CRYPTO_EX_DATA_IMPL *impl = NULL; 171 172 /* To call "impl" functions, use this macro rather than referring to 'impl' directly, eg. 173 * EX_IMPL(get_new_index)(...); 174 */ 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); 189 190 static CRYPTO_EX_DATA_IMPL impl_default = { 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 202 impl_check(void) 203 { 204 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 205 if (!impl) 206 impl = &impl_default; 207 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 208 } 209 /* A macro wrapper for impl_check that first uses a non-locked test before 210 * invoking the function (which checks again inside a lock). */ 211 #define IMPL_CHECK if(!impl) impl_check(); 212 213 /* API functions to get/set the "ex_data" implementation */ 214 const CRYPTO_EX_DATA_IMPL * 215 CRYPTO_get_ex_data_implementation(void) 216 { 217 IMPL_CHECK 218 return impl; 219 } 220 221 int 222 CRYPTO_set_ex_data_implementation(const CRYPTO_EX_DATA_IMPL *i) 223 { 224 int toret = 0; 225 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 226 if (!impl) { 227 impl = i; 228 toret = 1; 229 } 230 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 231 return toret; 232 } 233 234 /****************************************************************************/ 235 /* Interal (default) implementation of "ex_data" support. API functions are 236 * further down. */ 237 238 /* The type that represents what each "class" used to implement locally. A STACK 239 * of CRYPTO_EX_DATA_FUNCS plus a index-counter. The 'class_index' is the global 240 * value representing the class that is used to distinguish these items. */ 241 typedef struct st_ex_class_item { 242 int class_index; 243 STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth; 244 int meth_num; 245 } EX_CLASS_ITEM; 246 247 /* When assigning new class indexes, this is our counter */ 248 static int ex_class = CRYPTO_EX_INDEX_USER; 249 250 /* The global hash table of EX_CLASS_ITEM items */ 251 DECLARE_LHASH_OF(EX_CLASS_ITEM); 252 static LHASH_OF(EX_CLASS_ITEM) *ex_data = NULL; 253 254 /* The callbacks required in the "ex_data" hash table */ 255 static unsigned long 256 ex_class_item_hash(const EX_CLASS_ITEM *a) 257 { 258 return a->class_index; 259 } 260 261 static IMPLEMENT_LHASH_HASH_FN(ex_class_item, EX_CLASS_ITEM) 262 263 static int 264 ex_class_item_cmp(const EX_CLASS_ITEM *a, const EX_CLASS_ITEM *b) 265 { 266 return a->class_index - b->class_index; 267 } 268 269 static IMPLEMENT_LHASH_COMP_FN(ex_class_item, EX_CLASS_ITEM) 270 271 /* Internal functions used by the "impl_default" implementation to access the 272 * state */ 273 274 static int 275 ex_data_check(void) 276 { 277 int toret = 1; 278 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 279 if (!ex_data && 280 (ex_data = lh_EX_CLASS_ITEM_new()) == NULL) 281 toret = 0; 282 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 283 return toret; 284 } 285 /* This macros helps reduce the locking from repeated checks because the 286 * ex_data_check() function checks ex_data again inside a lock. */ 287 #define EX_DATA_CHECK(iffail) if(!ex_data && !ex_data_check()) {iffail} 288 289 /* This "inner" callback is used by the callback function that follows it */ 290 static void 291 def_cleanup_util_cb(CRYPTO_EX_DATA_FUNCS *funcs) 292 { 293 free(funcs); 294 } 295 296 /* This callback is used in lh_doall to destroy all EX_CLASS_ITEM values from 297 * "ex_data" prior to the ex_data hash table being itself destroyed. Doesn't do 298 * any locking. */ 299 static void 300 def_cleanup_cb(void *a_void) 301 { 302 EX_CLASS_ITEM *item = (EX_CLASS_ITEM *)a_void; 303 sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, def_cleanup_util_cb); 304 free(item); 305 } 306 307 /* Return the EX_CLASS_ITEM from the "ex_data" hash table that corresponds to a 308 * given class. Handles locking. */ 309 static EX_CLASS_ITEM * 310 def_get_class(int class_index) 311 { 312 EX_CLASS_ITEM d, *p, *gen; 313 EX_DATA_CHECK(return NULL;) 314 d.class_index = class_index; 315 if (!OPENSSL_init_crypto(0, NULL)) 316 return NULL; 317 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 318 p = lh_EX_CLASS_ITEM_retrieve(ex_data, &d); 319 if (!p) { 320 gen = malloc(sizeof(EX_CLASS_ITEM)); 321 if (gen) { 322 gen->class_index = class_index; 323 gen->meth_num = 0; 324 gen->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null(); 325 if (!gen->meth) 326 free(gen); 327 else { 328 /* Because we're inside the ex_data lock, the 329 * return value from the insert will be NULL */ 330 (void)lh_EX_CLASS_ITEM_insert(ex_data, gen); 331 p = gen; 332 } 333 } 334 } 335 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 336 if (!p) 337 CRYPTOerror(ERR_R_MALLOC_FAILURE); 338 return p; 339 } 340 341 /* Add a new method to the given EX_CLASS_ITEM and return the corresponding 342 * index (or -1 for error). Handles locking. */ 343 static int 344 def_add_index(EX_CLASS_ITEM *item, long argl, void *argp, 345 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 346 { 347 int toret = -1; 348 CRYPTO_EX_DATA_FUNCS *a = malloc(sizeof(CRYPTO_EX_DATA_FUNCS)); 349 350 if (!a) { 351 CRYPTOerror(ERR_R_MALLOC_FAILURE); 352 return -1; 353 } 354 a->argl = argl; 355 a->argp = argp; 356 a->new_func = new_func; 357 a->dup_func = dup_func; 358 a->free_func = free_func; 359 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 360 while (sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) <= item->meth_num) { 361 if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, NULL)) { 362 CRYPTOerror(ERR_R_MALLOC_FAILURE); 363 free(a); 364 goto err; 365 } 366 } 367 toret = item->meth_num++; 368 (void)sk_CRYPTO_EX_DATA_FUNCS_set(item->meth, toret, a); 369 err: 370 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 371 return toret; 372 } 373 374 /**************************************************************/ 375 /* The functions in the default CRYPTO_EX_DATA_IMPL structure */ 376 377 static int 378 int_new_class(void) 379 { 380 int toret; 381 382 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 383 toret = ex_class++; 384 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 385 return toret; 386 } 387 388 static void 389 int_cleanup(void) 390 { 391 EX_DATA_CHECK(return;) 392 lh_EX_CLASS_ITEM_doall(ex_data, def_cleanup_cb); 393 lh_EX_CLASS_ITEM_free(ex_data); 394 ex_data = NULL; 395 impl = NULL; 396 } 397 398 static int 399 int_get_new_index(int class_index, long argl, void *argp, 400 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, 401 CRYPTO_EX_free *free_func) 402 { 403 EX_CLASS_ITEM *item = def_get_class(class_index); 404 405 if (!item) 406 return -1; 407 return def_add_index(item, argl, argp, new_func, dup_func, free_func); 408 } 409 410 /* Thread-safe by copying a class's array of "CRYPTO_EX_DATA_FUNCS" entries in 411 * the lock, then using them outside the lock. NB: Thread-safety only applies to 412 * the global "ex_data" state (ie. class definitions), not thread-safe on 'ad' 413 * itself. */ 414 static int 415 int_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 416 { 417 int mx, i; 418 void *ptr; 419 CRYPTO_EX_DATA_FUNCS **storage = NULL; 420 EX_CLASS_ITEM *item = def_get_class(class_index); 421 422 if (!item) 423 /* error is already set */ 424 return 0; 425 ad->sk = NULL; 426 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); 427 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); 428 if (mx > 0) { 429 storage = reallocarray(NULL, mx, sizeof(CRYPTO_EX_DATA_FUNCS*)); 430 if (!storage) 431 goto skip; 432 for (i = 0; i < mx; i++) 433 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value( 434 item->meth, i); 435 } 436 skip: 437 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); 438 if ((mx > 0) && !storage) { 439 CRYPTOerror(ERR_R_MALLOC_FAILURE); 440 return 0; 441 } 442 for (i = 0; i < mx; i++) { 443 if (storage[i] && storage[i]->new_func) { 444 ptr = CRYPTO_get_ex_data(ad, i); 445 storage[i]->new_func(obj, ptr, ad, i, 446 storage[i]->argl, storage[i]->argp); 447 } 448 } 449 free(storage); 450 return 1; 451 } 452 453 /* Same thread-safety notes as for "int_new_ex_data" */ 454 static int 455 int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from) 456 { 457 int mx, j, i; 458 char *ptr; 459 CRYPTO_EX_DATA_FUNCS **storage = NULL; 460 EX_CLASS_ITEM *item; 461 462 if (!from->sk) 463 /* 'to' should be "blank" which *is* just like 'from' */ 464 return 1; 465 if ((item = def_get_class(class_index)) == NULL) 466 return 0; 467 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); 468 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); 469 j = sk_void_num(from->sk); 470 if (j < mx) 471 mx = j; 472 if (mx > 0) { 473 storage = reallocarray(NULL, mx, sizeof(CRYPTO_EX_DATA_FUNCS*)); 474 if (!storage) 475 goto skip; 476 for (i = 0; i < mx; i++) 477 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value( 478 item->meth, i); 479 } 480 skip: 481 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); 482 if ((mx > 0) && !storage) { 483 CRYPTOerror(ERR_R_MALLOC_FAILURE); 484 return 0; 485 } 486 for (i = 0; i < mx; i++) { 487 ptr = CRYPTO_get_ex_data(from, i); 488 if (storage[i] && storage[i]->dup_func) 489 storage[i]->dup_func(to, from, &ptr, i, 490 storage[i]->argl, storage[i]->argp); 491 CRYPTO_set_ex_data(to, i, ptr); 492 } 493 free(storage); 494 return 1; 495 } 496 497 /* Same thread-safety notes as for "int_new_ex_data" */ 498 static void 499 int_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 500 { 501 int mx, i; 502 EX_CLASS_ITEM *item; 503 void *ptr; 504 CRYPTO_EX_DATA_FUNCS **storage = NULL; 505 506 if ((item = def_get_class(class_index)) == NULL) 507 return; 508 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); 509 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); 510 if (mx > 0) { 511 storage = reallocarray(NULL, mx, sizeof(CRYPTO_EX_DATA_FUNCS*)); 512 if (!storage) 513 goto skip; 514 for (i = 0; i < mx; i++) 515 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value( 516 item->meth, i); 517 } 518 skip: 519 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); 520 if ((mx > 0) && !storage) { 521 CRYPTOerror(ERR_R_MALLOC_FAILURE); 522 return; 523 } 524 for (i = 0; i < mx; i++) { 525 if (storage[i] && storage[i]->free_func) { 526 ptr = CRYPTO_get_ex_data(ad, i); 527 storage[i]->free_func(obj, ptr, ad, i, 528 storage[i]->argl, storage[i]->argp); 529 } 530 } 531 free(storage); 532 if (ad->sk) { 533 sk_void_free(ad->sk); 534 ad->sk = NULL; 535 } 536 } 537 538 /********************************************************************/ 539 /* API functions that defer all "state" operations to the "ex_data" 540 * implementation we have set. */ 541 542 /* Obtain an index for a new class (not the same as getting a new index within 543 * an existing class - this is actually getting a new *class*) */ 544 int 545 CRYPTO_ex_data_new_class(void) 546 { 547 IMPL_CHECK 548 return EX_IMPL(new_class)(); 549 } 550 551 /* Release all "ex_data" state to prevent memory leaks. This can't be made 552 * thread-safe without overhauling a lot of stuff, and shouldn't really be 553 * called under potential race-conditions anyway (it's for program shutdown 554 * after all). */ 555 void 556 CRYPTO_cleanup_all_ex_data(void) 557 { 558 IMPL_CHECK 559 EX_IMPL(cleanup)(); 560 } 561 562 /* Inside an existing class, get/register a new index. */ 563 int 564 CRYPTO_get_ex_new_index(int class_index, long argl, void *argp, 565 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 566 { 567 int ret = -1; 568 569 IMPL_CHECK 570 ret = EX_IMPL(get_new_index)(class_index, 571 argl, argp, new_func, dup_func, free_func); 572 return ret; 573 } 574 575 /* Initialise a new CRYPTO_EX_DATA for use in a particular class - including 576 * calling new() callbacks for each index in the class used by this variable */ 577 int 578 CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 579 { 580 IMPL_CHECK 581 return EX_IMPL(new_ex_data)(class_index, obj, ad); 582 } 583 584 /* Duplicate a CRYPTO_EX_DATA variable - including calling dup() callbacks for 585 * each index in the class used by this variable */ 586 int 587 CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from) 588 { 589 IMPL_CHECK 590 return EX_IMPL(dup_ex_data)(class_index, to, from); 591 } 592 593 /* Cleanup a CRYPTO_EX_DATA variable - including calling free() callbacks for 594 * each index in the class used by this variable */ 595 void 596 CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 597 { 598 IMPL_CHECK 599 EX_IMPL(free_ex_data)(class_index, obj, ad); 600 } 601 602 /* For a given CRYPTO_EX_DATA variable, set the value corresponding to a 603 * particular index in the class used by this variable */ 604 int 605 CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val) 606 { 607 int i; 608 609 if (ad->sk == NULL) { 610 if ((ad->sk = sk_void_new_null()) == NULL) { 611 CRYPTOerror(ERR_R_MALLOC_FAILURE); 612 return (0); 613 } 614 } 615 i = sk_void_num(ad->sk); 616 617 while (i <= idx) { 618 if (!sk_void_push(ad->sk, NULL)) { 619 CRYPTOerror(ERR_R_MALLOC_FAILURE); 620 return (0); 621 } 622 i++; 623 } 624 sk_void_set(ad->sk, idx, val); 625 return (1); 626 } 627 628 /* For a given CRYPTO_EX_DATA_ variable, get the value corresponding to a 629 * particular index in the class used by this variable */ 630 void * 631 CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx) 632 { 633 if (ad->sk == NULL) 634 return (0); 635 else if (idx >= sk_void_num(ad->sk)) 636 return (0); 637 else 638 return (sk_void_value(ad->sk, idx)); 639 } 640