ref: 94f2907dc40a6415a10c252cb9ba3971f1f7e838
dir: /third_party/boringssl/src/crypto/ex_data.c/
/* Copyright (C) 1995-1998 Eric Young ([email protected])
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young ([email protected]).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson ([email protected]).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young ([email protected])"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson ([email protected])"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* [email protected].
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* ([email protected]). This product includes software written by Tim
* Hudson ([email protected]). */
#include <openssl/ex_data.h>
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/thread.h>
#include "internal.h"
DEFINE_STACK_OF(CRYPTO_EX_DATA_FUNCS)
struct crypto_ex_data_func_st {
long argl; // Arbitary long
void *argp; // Arbitary void pointer
CRYPTO_EX_free *free_func;
// next points to the next |CRYPTO_EX_DATA_FUNCS| or NULL if this is the last
// one. It may only be read if synchronized with a read from |num_funcs|.
CRYPTO_EX_DATA_FUNCS *next;
};
int CRYPTO_get_ex_new_index_ex(CRYPTO_EX_DATA_CLASS *ex_data_class, long argl,
void *argp, CRYPTO_EX_free *free_func) {
CRYPTO_EX_DATA_FUNCS *funcs = OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS));
if (funcs == NULL) {
return -1;
}
funcs->argl = argl;
funcs->argp = argp;
funcs->free_func = free_func;
funcs->next = NULL;
CRYPTO_MUTEX_lock_write(&ex_data_class->lock);
uint32_t num_funcs = CRYPTO_atomic_load_u32(&ex_data_class->num_funcs);
// The index must fit in |int|.
if (num_funcs > (size_t)(INT_MAX - ex_data_class->num_reserved)) {
OPENSSL_PUT_ERROR(CRYPTO, ERR_R_OVERFLOW);
CRYPTO_MUTEX_unlock_write(&ex_data_class->lock);
return -1;
}
// Append |funcs| to the linked list.
if (ex_data_class->last == NULL) {
assert(num_funcs == 0);
ex_data_class->funcs = funcs;
ex_data_class->last = funcs;
} else {
ex_data_class->last->next = funcs;
ex_data_class->last = funcs;
}
CRYPTO_atomic_store_u32(&ex_data_class->num_funcs, num_funcs + 1);
CRYPTO_MUTEX_unlock_write(&ex_data_class->lock);
return (int)num_funcs + ex_data_class->num_reserved;
}
int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int index, void *val) {
if (index < 0) {
// A caller that can accidentally pass in an invalid index into this
// function will hit an memory error if |index| happened to be valid, and
// expected |val| to be of a different type.
abort();
}
if (ad->sk == NULL) {
ad->sk = sk_void_new_null();
if (ad->sk == NULL) {
return 0;
}
}
// Add NULL values until the stack is long enough.
for (size_t i = sk_void_num(ad->sk); i <= (size_t)index; i++) {
if (!sk_void_push(ad->sk, NULL)) {
return 0;
}
}
sk_void_set(ad->sk, (size_t)index, val);
return 1;
}
void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx) {
if (ad->sk == NULL || idx < 0 || (size_t)idx >= sk_void_num(ad->sk)) {
return NULL;
}
return sk_void_value(ad->sk, idx);
}
void CRYPTO_new_ex_data(CRYPTO_EX_DATA *ad) {
ad->sk = NULL;
}
void CRYPTO_free_ex_data(CRYPTO_EX_DATA_CLASS *ex_data_class, void *obj,
CRYPTO_EX_DATA *ad) {
if (ad->sk == NULL) {
// Nothing to do.
return;
}
uint32_t num_funcs = CRYPTO_atomic_load_u32(&ex_data_class->num_funcs);
// |CRYPTO_get_ex_new_index_ex| will not allocate indices beyond |INT_MAX|.
assert(num_funcs <= (size_t)(INT_MAX - ex_data_class->num_reserved));
// Defer dereferencing |ex_data_class->funcs| and |funcs->next|. It must come
// after the |num_funcs| comparison to be correctly synchronized.
CRYPTO_EX_DATA_FUNCS *const *funcs = &ex_data_class->funcs;
for (uint32_t i = 0; i < num_funcs; i++) {
if ((*funcs)->free_func != NULL) {
int index = (int)i + ex_data_class->num_reserved;
void *ptr = CRYPTO_get_ex_data(ad, index);
(*funcs)->free_func(obj, ptr, ad, index, (*funcs)->argl, (*funcs)->argp);
}
funcs = &(*funcs)->next;
}
sk_void_free(ad->sk);
ad->sk = NULL;
}
void CRYPTO_cleanup_all_ex_data(void) {}