1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
57 /* ====================================================================
58 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
60 * Redistribution and use in source and binary forms, with or without
61 * modification, are permitted provided that the following conditions
64 * 1. Redistributions of source code must retain the above copyright
65 * notice, this list of conditions and the following disclaimer.
67 * 2. Redistributions in binary form must reproduce the above copyright
68 * notice, this list of conditions and the following disclaimer in
69 * the documentation and/or other materials provided with the
72 * 3. All advertising materials mentioning features or use of this
73 * software must display the following acknowledgment:
74 * "This product includes software developed by the OpenSSL Project
75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
78 * endorse or promote products derived from this software without
79 * prior written permission. For written permission, please contact
80 * openssl-core@openssl.org.
82 * 5. Products derived from this software may not be called "OpenSSL"
83 * nor may "OpenSSL" appear in their names without prior written
84 * permission of the OpenSSL Project.
86 * 6. Redistributions of any form whatsoever must retain the following
88 * "This product includes software developed by the OpenSSL Project
89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
102 * OF THE POSSIBILITY OF SUCH DAMAGE.
103 * ====================================================================
105 * This product includes cryptographic software written by Eric Young
106 * (eay@cryptsoft.com). This product includes software written by Tim
107 * Hudson (tjh@cryptsoft.com). */
109 #include <openssl/ex_data.h>
113 #include <openssl/err.h>
114 #include <openssl/lhash.h>
115 #include <openssl/mem.h>
116 #include <openssl/stack.h>
117 #include <openssl/thread.h>
119 #include "crypto_error.h"
120 #include "internal.h"
122 typedef struct crypto_ex_data_func_st {
123 long argl; /* Arbitary long */
124 void *argp; /* Arbitary void pointer */
125 CRYPTO_EX_new *new_func;
126 CRYPTO_EX_free *free_func;
127 CRYPTO_EX_dup *dup_func;
128 } CRYPTO_EX_DATA_FUNCS;
130 typedef struct st_ex_class_item {
131 STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth;
135 static LHASH_OF(EX_CLASS_ITEM) *global_classes = NULL;
137 static int global_next_class = 100;
139 static int new_class(void) {
141 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
142 ret = global_next_class++;
143 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
148 /* class_hash is a hash function used by an LHASH of |EX_CLASS_ITEM|
150 static uint32_t class_hash(const EX_CLASS_ITEM *a) {
151 return a->class_value;
154 /* class_cmp is a comparision function for an LHASH of |EX_CLASS_ITEM|
156 static int class_cmp(const EX_CLASS_ITEM *a, const EX_CLASS_ITEM *b) {
157 return a->class_value - b->class_value;
160 /* data_funcs_free is a callback function from |sk_pop_free| that frees a
161 * |CRYPTO_EX_DATA_FUNCS|. */
162 static void data_funcs_free(CRYPTO_EX_DATA_FUNCS *funcs) {
166 /* class_free is a callback function from lh_doall to free the EX_CLASS_ITEM
168 static void class_free(EX_CLASS_ITEM *item) {
169 sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, data_funcs_free);
172 static LHASH_OF(EX_CLASS_ITEM) *get_classes(void) {
173 LHASH_OF(EX_CLASS_ITEM) *ret;
175 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
176 ret = global_classes;
177 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
183 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
184 if (global_classes == NULL) {
185 global_classes = lh_EX_CLASS_ITEM_new(class_hash, class_cmp);
187 ret = global_classes;
188 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
193 static void cleanup(void) {
194 LHASH_OF(EX_CLASS_ITEM) *classes = get_classes();
196 lh_EX_CLASS_ITEM_doall(classes, class_free);
197 lh_EX_CLASS_ITEM_free(classes);
199 global_classes = NULL;
202 static EX_CLASS_ITEM *get_class(int class_value) {
203 LHASH_OF(EX_CLASS_ITEM) *const classes = get_classes();
204 EX_CLASS_ITEM template, *class_item;
207 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
208 template.class_value = class_value;
209 class_item = lh_EX_CLASS_ITEM_retrieve(classes, &template);
210 if (class_item != NULL) {
213 class_item = OPENSSL_malloc(sizeof(EX_CLASS_ITEM));
215 class_item->class_value = class_value;
216 class_item->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null();
217 if (class_item->meth != NULL) {
218 EX_CLASS_ITEM *old_data;
219 ok = lh_EX_CLASS_ITEM_insert(classes, &old_data, class_item);
220 assert(old_data == NULL);
224 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
228 if (class_item->meth) {
229 sk_CRYPTO_EX_DATA_FUNCS_free(class_item->meth);
231 OPENSSL_free(class_item);
235 OPENSSL_PUT_ERROR(CRYPTO, get_class, ERR_R_MALLOC_FAILURE);
241 static int get_new_index(int class_value, long argl, void *argp,
242 CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
243 CRYPTO_EX_free *free_func) {
244 EX_CLASS_ITEM *const item = get_class(class_value);
245 CRYPTO_EX_DATA_FUNCS *funcs;
252 funcs = OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS));
254 OPENSSL_PUT_ERROR(CRYPTO, get_new_index, ERR_R_MALLOC_FAILURE);
260 funcs->new_func = new_func;
261 funcs->dup_func = dup_func;
262 funcs->free_func = free_func;
264 CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
266 if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, funcs)) {
267 OPENSSL_PUT_ERROR(CRYPTO, get_new_index, ERR_R_MALLOC_FAILURE);
272 ret = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) - 1;
275 CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
279 /* get_func_pointers takes a copy of the CRYPTO_EX_DATA_FUNCS pointers, if any,
280 * for the given class. If there are some pointers, it sets |*out| to point to
281 * a fresh stack of them. Otherwise it sets |*out| to NULL. It returns one on
282 * success or zero on error. */
283 static int get_func_pointers(STACK_OF(CRYPTO_EX_DATA_FUNCS) **out,
285 EX_CLASS_ITEM *const item = get_class(class_value);
294 /* CRYPTO_EX_DATA_FUNCS structures are static once set, so we can take a
295 * shallow copy of the list under lock and then use the structures without
297 CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
298 n = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
300 *out = sk_CRYPTO_EX_DATA_FUNCS_dup(item->meth);
302 CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
304 if (n > 0 && *out == NULL) {
305 OPENSSL_PUT_ERROR(CRYPTO, get_func_pointers, ERR_R_MALLOC_FAILURE);
312 static int new_ex_data(int class_value, void *obj, CRYPTO_EX_DATA *ad) {
313 STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers;
318 if (!get_func_pointers(&func_pointers, class_value)) {
322 for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) {
323 CRYPTO_EX_DATA_FUNCS *func_pointer =
324 sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i);
325 if (func_pointer->new_func) {
326 func_pointer->new_func(obj, NULL, ad, i, func_pointer->argl,
331 sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers);
336 static int dup_ex_data(int class_value, CRYPTO_EX_DATA *to,
337 const CRYPTO_EX_DATA *from) {
338 STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers;
342 /* In this case, |from| is blank, which is also the initial state of |to|,
343 * so there's nothing to do. */
347 if (!get_func_pointers(&func_pointers, class_value)) {
351 for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) {
352 CRYPTO_EX_DATA_FUNCS *func_pointer =
353 sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i);
354 void *ptr = CRYPTO_get_ex_data(from, i);
355 if (func_pointer->dup_func) {
356 func_pointer->dup_func(to, from, &ptr, i, func_pointer->argl,
359 CRYPTO_set_ex_data(to, i, ptr);
362 sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers);
367 static void free_ex_data(int class_value, void *obj, CRYPTO_EX_DATA *ad) {
368 STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers;
371 if (!get_func_pointers(&func_pointers, class_value)) {
375 for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) {
376 CRYPTO_EX_DATA_FUNCS *func_pointer =
377 sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i);
378 if (func_pointer->free_func) {
379 void *ptr = CRYPTO_get_ex_data(ad, i);
380 func_pointer->free_func(obj, ptr, ad, i, func_pointer->argl,
385 sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers);
388 sk_void_free(ad->sk);
393 const CRYPTO_EX_DATA_IMPL ex_data_default_impl = {
394 new_class, cleanup, get_new_index, new_ex_data, dup_ex_data, free_ex_data};