Line data Source code
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 : /*
59 : * Initialise a engine type for use (or up its functional reference count if
60 : * it's already in use). This version is only used internally.
61 : */
62 0 : int engine_unlocked_init(ENGINE *e)
63 : {
64 : int to_return = 1;
65 :
66 0 : if ((e->funct_ref == 0) && e->init)
67 : /*
68 : * This is the first functional reference and the engine requires
69 : * initialisation so we do it now.
70 : */
71 0 : to_return = e->init(e);
72 0 : if (to_return) {
73 : /*
74 : * OK, we return a functional reference which is also a structural
75 : * reference.
76 : */
77 0 : e->struct_ref++;
78 0 : e->funct_ref++;
79 : engine_ref_debug(e, 0, 1)
80 : engine_ref_debug(e, 1, 1)
81 : }
82 0 : return to_return;
83 : }
84 :
85 : /*
86 : * Free a functional reference to a engine type. This version is only used
87 : * internally.
88 : */
89 0 : int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
90 : {
91 : int to_return = 1;
92 :
93 : /*
94 : * Reduce the functional reference count here so if it's the terminating
95 : * case, we can release the lock safely and call the finish() handler
96 : * without risk of a race. We get a race if we leave the count until
97 : * after and something else is calling "finish" at the same time -
98 : * there's a chance that both threads will together take the count from 2
99 : * to 0 without either calling finish().
100 : */
101 0 : e->funct_ref--;
102 : engine_ref_debug(e, 1, -1);
103 0 : if ((e->funct_ref == 0) && e->finish) {
104 0 : if (unlock_for_handlers)
105 0 : CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
106 0 : to_return = e->finish(e);
107 0 : if (unlock_for_handlers)
108 0 : CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
109 0 : if (!to_return)
110 : return 0;
111 : }
112 : #ifdef REF_CHECK
113 : if (e->funct_ref < 0) {
114 : fprintf(stderr, "ENGINE_finish, bad functional reference count\n");
115 : abort();
116 : }
117 : #endif
118 : /* Release the structural reference too */
119 0 : if (!engine_free_util(e, 0)) {
120 0 : ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH, ENGINE_R_FINISH_FAILED);
121 0 : return 0;
122 : }
123 : return to_return;
124 : }
125 :
126 : /* The API (locked) version of "init" */
127 0 : int ENGINE_init(ENGINE *e)
128 : {
129 : int ret;
130 0 : if (e == NULL) {
131 0 : ENGINEerr(ENGINE_F_ENGINE_INIT, ERR_R_PASSED_NULL_PARAMETER);
132 0 : return 0;
133 : }
134 0 : CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
135 0 : ret = engine_unlocked_init(e);
136 0 : CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
137 0 : return ret;
138 : }
139 :
140 : /* The API (locked) version of "finish" */
141 0 : int ENGINE_finish(ENGINE *e)
142 : {
143 : int to_return = 1;
144 :
145 0 : if (e == NULL) {
146 0 : ENGINEerr(ENGINE_F_ENGINE_FINISH, ERR_R_PASSED_NULL_PARAMETER);
147 0 : return 0;
148 : }
149 0 : CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
150 0 : to_return = engine_unlocked_finish(e, 1);
151 0 : CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
152 0 : if (!to_return) {
153 0 : ENGINEerr(ENGINE_F_ENGINE_FINISH, ENGINE_R_FINISH_FAILED);
154 0 : return 0;
155 : }
156 : return to_return;
157 : }
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