release/src/router/openssl/crypto/engine/eng_init.c

   1 /* crypto/engine/eng_init.c */
   2 /* ====================================================================
   3  * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    licensing@OpenSSL.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55
  56 #include "eng_int.h"
  57
  58 /* Initialise a engine type for use (or up its functional reference count
  59  * if it's already in use). This version is only used internally. */
  60 int engine_unlocked_init(ENGINE *e)
  61         {
  62         int to_return = 1;
  63
  64         if((e->funct_ref == 0) && e->init)
  65                 /* This is the first functional reference and the engine
  66                  * requires initialisation so we do it now. */
  67                 to_return = e->init(e);
  68         if(to_return)
  69                 {
  70                 /* OK, we return a functional reference which is also a
  71                  * structural reference. */
  72                 e->struct_ref++;
  73                 e->funct_ref++;
  74                 engine_ref_debug(e, 0, 1)
  75                 engine_ref_debug(e, 1, 1)
  76                 }
  77         return to_return;
  78         }
  79
  80 /* Free a functional reference to a engine type. This version is only used
  81  * internally. */
  82 int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
  83         {
  84         int to_return = 1;
  85
  86         /* Reduce the functional reference count here so if it's the terminating
  87          * case, we can release the lock safely and call the finish() handler
  88          * without risk of a race. We get a race if we leave the count until
  89          * after and something else is calling "finish" at the same time -
  90          * there's a chance that both threads will together take the count from
  91          * 2 to 0 without either calling finish(). */
  92         e->funct_ref--;
  93         engine_ref_debug(e, 1, -1);
  94         if((e->funct_ref == 0) && e->finish)
  95                 {
  96                 if(unlock_for_handlers)
  97                         CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
  98                 to_return = e->finish(e);
  99                 if(unlock_for_handlers)
 100                         CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 101                 if(!to_return)
 102                         return 0;
 103                 }
 104 #ifdef REF_CHECK
 105         if(e->funct_ref < 0)
 106                 {
 107                 fprintf(stderr,"ENGINE_finish, bad functional reference count\n");
 108                 abort();
 109                 }
 110 #endif
 111         /* Release the structural reference too */
 112         if(!engine_free_util(e, 0))
 113                 {
 114                 ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH,ENGINE_R_FINISH_FAILED);
 115                 return 0;
 116                 }
 117         return to_return;
 118         }
 119
 120 /* The API (locked) version of "init" */
 121 int ENGINE_init(ENGINE *e)
 122         {
 123         int ret;
 124         if(e == NULL)
 125                 {
 126                 ENGINEerr(ENGINE_F_ENGINE_INIT,ERR_R_PASSED_NULL_PARAMETER);
 127                 return 0;
 128                 }
 129         CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 130         ret = engine_unlocked_init(e);
 131         CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 132         return ret;
 133         }
 134
 135 /* The API (locked) version of "finish" */
 136 int ENGINE_finish(ENGINE *e)
 137         {
 138         int to_return = 1;
 139
 140         if(e == NULL)
 141                 {
 142                 ENGINEerr(ENGINE_F_ENGINE_FINISH,ERR_R_PASSED_NULL_PARAMETER);
 143                 return 0;
 144                 }
 145         CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 146         to_return = engine_unlocked_finish(e, 1);
 147         CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 148         if(!to_return)
 149                 {
 150                 ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);
 151                 return 0;
 152                 }
 153         return to_return;
 154         }