/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * 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 (tjh@cryptsoft.com).

 *

 * 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 (eay@cryptsoft.com)"

 *    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 (tjh@cryptsoft.com)"

 *

 * 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

 *    openssl-core@openssl.org.

 *

 * 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

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com). */

#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(CRYPTO_EX_DATA_CLASS *ex_data_class, int *out_index,

                            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 0;

  }

  funcs->argl = argl;

  funcs->argp = argp;

  funcs->free_func = free_func;

  funcs->next = NULL;

  CRYPTO_STATIC_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_STATIC_MUTEX_unlock_write(&ex_data_class->lock);

    return 0;

  }

  // 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_STATIC_MUTEX_unlock_write(&ex_data_class->lock);

  *out_index = (int)num_funcs + ex_data_class->num_reserved;

  return 1;

}

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| 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) {}