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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 52 * Hudson (tjh (at) 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 } 155
