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 /* 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, CRYPTO_EX_DATA *ad); 160 /* Duplicate a CRYPTO_EX_DATA of a given class onto a copy */ 161 int (*cb_dup_ex_data) (int class_index, CRYPTO_EX_DATA *to, 162 CRYPTO_EX_DATA *from); 163 /* Cleanup a CRYPTO_EX_DATA of a given class */ 164 void (*cb_free_ex_data) (int class_index, void *obj, CRYPTO_EX_DATA *ad); 165 }; 166 167 /* The implementation we use at run-time */ 168 static const CRYPTO_EX_DATA_IMPL *impl = NULL; 169 170 /* 171 * To call "impl" functions, use this macro rather than referring to 'impl' 172 * directly, eg. EX_IMPL(get_new_index)(...); 173 */ 174 #define EX_IMPL(a) impl->cb_##a 175 176 /* Predeclare the "default" ex_data implementation */ 177 static int int_new_class(void); 178 static void int_cleanup(void); 179 static int int_get_new_index(int class_index, long argl, void *argp, 180 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, 181 CRYPTO_EX_free *free_func); 182 static int int_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad); 183 static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, 184 CRYPTO_EX_DATA *from); 185 static void int_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad); 186 static CRYPTO_EX_DATA_IMPL impl_default = { 187 int_new_class, 188 int_cleanup, 189 int_get_new_index, 190 int_new_ex_data, 191 int_dup_ex_data, 192 int_free_ex_data 193 }; 194 195 /* 196 * Internal function that checks whether "impl" is set and if not, sets it to 197 * the default. 198 */ 199 static void impl_check(void) 200 { 201 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 202 if (!impl) 203 impl = &impl_default; 204 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 205 } 206 207 /* 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 */ 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 *CRYPTO_get_ex_data_implementation(void) 215 { 216 IMPL_CHECK return impl; 217 } 218 219 int CRYPTO_set_ex_data_implementation(const CRYPTO_EX_DATA_IMPL *i) 220 { 221 int toret = 0; 222 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 223 if (!impl) { 224 impl = i; 225 toret = 1; 226 } 227 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 228 return toret; 229 } 230 231 /****************************************************************************/ 232 /* 233 * Interal (default) implementation of "ex_data" support. API functions are 234 * further down. 235 */ 236 237 /* 238 * The type that represents what each "class" used to implement locally. A 239 * STACK of CRYPTO_EX_DATA_FUNCS plus a index-counter. The 'class_index' is 240 * the global value representing the class that is used to distinguish these 241 * items. 242 */ 243 typedef struct st_ex_class_item { 244 int class_index; 245 STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth; 246 int meth_num; 247 } EX_CLASS_ITEM; 248 249 /* When assigning new class indexes, this is our counter */ 250 static int ex_class = CRYPTO_EX_INDEX_USER; 251 252 /* The global hash table of EX_CLASS_ITEM items */ 253 DECLARE_LHASH_OF(EX_CLASS_ITEM); 254 static LHASH_OF(EX_CLASS_ITEM) *ex_data = NULL; 255 256 /* The callbacks required in the "ex_data" hash table */ 257 static unsigned long ex_class_item_hash(const EX_CLASS_ITEM *a) 258 { 259 return a->class_index; 260 } 261 262 static IMPLEMENT_LHASH_HASH_FN(ex_class_item, EX_CLASS_ITEM) 263 264 static int 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 /* 272 * Internal functions used by the "impl_default" implementation to access the 273 * state 274 */ 275 static int ex_data_check(void) 276 { 277 int toret = 1; 278 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 279 if (!ex_data && (ex_data = lh_EX_CLASS_ITEM_new()) == NULL) 280 toret = 0; 281 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 282 return toret; 283 } 284 285 /* 286 * This macros helps reduce the locking from repeated checks because the 287 * ex_data_check() function checks ex_data again inside a lock. 288 */ 289 #define EX_DATA_CHECK(iffail) if(!ex_data && !ex_data_check()) {iffail} 290 291 /* This "inner" callback is used by the callback function that follows it */ 292 static void def_cleanup_util_cb(CRYPTO_EX_DATA_FUNCS *funcs) 293 { 294 OPENSSL_free(funcs); 295 } 296 297 /* 298 * This callback is used in lh_doall to destroy all EX_CLASS_ITEM values from 299 * "ex_data" prior to the ex_data hash table being itself destroyed. Doesn't 300 * do any locking. 301 */ 302 static void def_cleanup_cb(void *a_void) 303 { 304 EX_CLASS_ITEM *item = (EX_CLASS_ITEM *)a_void; 305 sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, def_cleanup_util_cb); 306 OPENSSL_free(item); 307 } 308 309 /* 310 * Return the EX_CLASS_ITEM from the "ex_data" hash table that corresponds to 311 * a given class. Handles locking. 312 */ 313 static EX_CLASS_ITEM *def_get_class(int class_index) 314 { 315 EX_CLASS_ITEM d, *p, *gen; 316 EX_DATA_CHECK(return NULL;) 317 d.class_index = class_index; 318 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 319 p = lh_EX_CLASS_ITEM_retrieve(ex_data, &d); 320 if (!p) { 321 gen = OPENSSL_malloc(sizeof(EX_CLASS_ITEM)); 322 if (gen) { 323 gen->class_index = class_index; 324 gen->meth_num = 0; 325 gen->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null(); 326 if (!gen->meth) 327 OPENSSL_free(gen); 328 else { 329 /* 330 * Because we're inside the ex_data lock, the return value 331 * from the insert will be NULL 332 */ 333 (void)lh_EX_CLASS_ITEM_insert(ex_data, gen); 334 p = gen; 335 } 336 } 337 } 338 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 339 if (!p) 340 CRYPTOerr(CRYPTO_F_DEF_GET_CLASS, ERR_R_MALLOC_FAILURE); 341 return p; 342 } 343 344 /* 345 * Add a new method to the given EX_CLASS_ITEM and return the corresponding 346 * index (or -1 for error). Handles locking. 347 */ 348 static int def_add_index(EX_CLASS_ITEM *item, long argl, void *argp, 349 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, 350 CRYPTO_EX_free *free_func) 351 { 352 int toret = -1; 353 CRYPTO_EX_DATA_FUNCS *a = 354 (CRYPTO_EX_DATA_FUNCS *)OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS)); 355 if (!a) { 356 CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX, ERR_R_MALLOC_FAILURE); 357 return -1; 358 } 359 a->argl = argl; 360 a->argp = argp; 361 a->new_func = new_func; 362 a->dup_func = dup_func; 363 a->free_func = free_func; 364 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 365 while (sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) <= item->meth_num) { 366 if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, NULL)) { 367 CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX, ERR_R_MALLOC_FAILURE); 368 OPENSSL_free(a); 369 goto err; 370 } 371 } 372 toret = item->meth_num++; 373 (void)sk_CRYPTO_EX_DATA_FUNCS_set(item->meth, toret, a); 374 err: 375 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 376 return toret; 377 } 378 379 /**************************************************************/ 380 /* The functions in the default CRYPTO_EX_DATA_IMPL structure */ 381 382 static int int_new_class(void) 383 { 384 int toret; 385 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); 386 toret = ex_class++; 387 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); 388 return toret; 389 } 390 391 static void int_cleanup(void) 392 { 393 EX_DATA_CHECK(return;) 394 lh_EX_CLASS_ITEM_doall(ex_data, def_cleanup_cb); 395 lh_EX_CLASS_ITEM_free(ex_data); 396 ex_data = NULL; 397 impl = NULL; 398 } 399 400 static int int_get_new_index(int class_index, long argl, void *argp, 401 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, 402 CRYPTO_EX_free *free_func) 403 { 404 EX_CLASS_ITEM *item = def_get_class(class_index); 405 if (!item) 406 return -1; 407 return def_add_index(item, argl, argp, new_func, dup_func, free_func); 408 } 409 410 /* 411 * Thread-safe by copying a class's array of "CRYPTO_EX_DATA_FUNCS" entries 412 * in the lock, then using them outside the lock. NB: Thread-safety only 413 * applies to the global "ex_data" state (ie. class definitions), not 414 * thread-safe on 'ad' itself. 415 */ 416 static int int_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 417 { 418 int mx, i; 419 void *ptr; 420 CRYPTO_EX_DATA_FUNCS **storage = NULL; 421 EX_CLASS_ITEM *item = def_get_class(class_index); 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 = OPENSSL_malloc(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(item->meth, i); 434 } 435 skip: 436 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); 437 if ((mx > 0) && !storage) { 438 CRYPTOerr(CRYPTO_F_INT_NEW_EX_DATA, ERR_R_MALLOC_FAILURE); 439 return 0; 440 } 441 for (i = 0; i < mx; i++) { 442 if (storage[i] && storage[i]->new_func) { 443 ptr = CRYPTO_get_ex_data(ad, i); 444 storage[i]->new_func(obj, ptr, ad, i, 445 storage[i]->argl, storage[i]->argp); 446 } 447 } 448 if (storage) 449 OPENSSL_free(storage); 450 return 1; 451 } 452 453 /* Same thread-safety notes as for "int_new_ex_data" */ 454 static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, 455 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 if (!from->sk) 462 /* 'to' should be "blank" which *is* just like 'from' */ 463 return 1; 464 if ((item = def_get_class(class_index)) == NULL) 465 return 0; 466 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); 467 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); 468 j = sk_void_num(from->sk); 469 if (j < mx) 470 mx = j; 471 if (mx > 0) { 472 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS *)); 473 if (!storage) 474 goto skip; 475 for (i = 0; i < mx; i++) 476 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth, i); 477 } 478 skip: 479 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); 480 if ((mx > 0) && !storage) { 481 CRYPTOerr(CRYPTO_F_INT_DUP_EX_DATA, ERR_R_MALLOC_FAILURE); 482 return 0; 483 } 484 for (i = 0; i < mx; i++) { 485 ptr = CRYPTO_get_ex_data(from, i); 486 if (storage[i] && storage[i]->dup_func) 487 storage[i]->dup_func(to, from, &ptr, i, 488 storage[i]->argl, storage[i]->argp); 489 CRYPTO_set_ex_data(to, i, ptr); 490 } 491 if (storage) 492 OPENSSL_free(storage); 493 return 1; 494 } 495 496 /* Same thread-safety notes as for "int_new_ex_data" */ 497 static void int_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 498 { 499 int mx, i; 500 EX_CLASS_ITEM *item; 501 void *ptr; 502 CRYPTO_EX_DATA_FUNCS **storage = NULL; 503 if (ex_data == NULL) 504 return; 505 if ((item = def_get_class(class_index)) == NULL) 506 return; 507 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); 508 mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); 509 if (mx > 0) { 510 storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS *)); 511 if (!storage) 512 goto skip; 513 for (i = 0; i < mx; i++) 514 storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth, i); 515 } 516 skip: 517 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); 518 if ((mx > 0) && !storage) { 519 CRYPTOerr(CRYPTO_F_INT_FREE_EX_DATA, ERR_R_MALLOC_FAILURE); 520 return; 521 } 522 for (i = 0; i < mx; i++) { 523 if (storage[i] && storage[i]->free_func) { 524 ptr = CRYPTO_get_ex_data(ad, i); 525 storage[i]->free_func(obj, ptr, ad, i, 526 storage[i]->argl, storage[i]->argp); 527 } 528 } 529 if (storage) 530 OPENSSL_free(storage); 531 if (ad->sk) { 532 sk_void_free(ad->sk); 533 ad->sk = NULL; 534 } 535 } 536 537 /********************************************************************/ 538 /* 539 * API functions that defer all "state" operations to the "ex_data" 540 * implementation we have set. 541 */ 542 543 /* 544 * Obtain an index for a new class (not the same as getting a new index 545 * within an existing class - this is actually getting a new *class*) 546 */ 547 int CRYPTO_ex_data_new_class(void) 548 { 549 IMPL_CHECK return EX_IMPL(new_class) (); 550 } 551 552 /* 553 * Release all "ex_data" state to prevent memory leaks. This can't be made 554 * thread-safe without overhauling a lot of stuff, and shouldn't really be 555 * called under potential race-conditions anyway (it's for program shutdown 556 * after all). 557 */ 558 void CRYPTO_cleanup_all_ex_data(void) 559 { 560 IMPL_CHECK EX_IMPL(cleanup) (); 561 } 562 563 /* Inside an existing class, get/register a new index. */ 564 int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp, 565 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, 566 CRYPTO_EX_free *free_func) 567 { 568 int ret = -1; 569 570 IMPL_CHECK 571 ret = EX_IMPL(get_new_index) (class_index, 572 argl, argp, new_func, dup_func, 573 free_func); 574 return ret; 575 } 576 577 /* 578 * Initialise a new CRYPTO_EX_DATA for use in a particular class - including 579 * calling new() callbacks for each index in the class used by this variable 580 */ 581 int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 582 { 583 IMPL_CHECK return EX_IMPL(new_ex_data) (class_index, obj, ad); 584 } 585 586 /* 587 * Duplicate a CRYPTO_EX_DATA variable - including calling dup() callbacks 588 * for each index in the class used by this variable 589 */ 590 int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, 591 CRYPTO_EX_DATA *from) 592 { 593 IMPL_CHECK return EX_IMPL(dup_ex_data) (class_index, to, from); 594 } 595 596 /* 597 * Cleanup a CRYPTO_EX_DATA variable - including calling free() callbacks for 598 * each index in the class used by this variable 599 */ 600 void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) 601 { 602 IMPL_CHECK EX_IMPL(free_ex_data) (class_index, obj, ad); 603 } 604 605 /* 606 * For a given CRYPTO_EX_DATA variable, set the value corresponding to a 607 * particular index in the class used by this variable 608 */ 609 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val) 610 { 611 int i; 612 613 if (ad->sk == NULL) { 614 if ((ad->sk = sk_void_new_null()) == NULL) { 615 CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA, ERR_R_MALLOC_FAILURE); 616 return (0); 617 } 618 } 619 i = sk_void_num(ad->sk); 620 621 while (i <= idx) { 622 if (!sk_void_push(ad->sk, NULL)) { 623 CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA, ERR_R_MALLOC_FAILURE); 624 return (0); 625 } 626 i++; 627 } 628 sk_void_set(ad->sk, idx, val); 629 return (1); 630 } 631 632 /* 633 * For a given CRYPTO_EX_DATA_ variable, get the value corresponding to a 634 * particular index in the class used by this variable 635 */ 636 void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx) 637 { 638 if (ad->sk == NULL) 639 return (0); 640 else if (idx >= sk_void_num(ad->sk)) 641 return (0); 642 else 643 return (sk_void_value(ad->sk, idx)); 644 } 645 646 IMPLEMENT_STACK_OF(CRYPTO_EX_DATA_FUNCS) 647