2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
62 #include <openssl/crypto.h>
68 /* These values are used as commands to DSO_ctrl() */
69 #define DSO_CTRL_GET_FLAGS 1
70 #define DSO_CTRL_SET_FLAGS 2
71 #define DSO_CTRL_OR_FLAGS 3
73 /* These flags control the translation of file-names from canonical to
74 * native. Eg. in the CryptoSwift support, the "dl" and "dlfcn"
75 * methods will translate "swift" -> "libswift.so" whereas the "win32"
76 * method will translate "swift" -> "swift.dll". NB: Until I can figure
77 * out how to be more "conventional" with this, the methods will only
78 * honour this flag if it looks like it was passed a file without any
79 * path and if the filename is small enough.
81 #define DSO_FLAG_NAME_TRANSLATION 0x01
83 typedef void (*DSO_FUNC_TYPE)(void);
85 typedef struct dso_st DSO;
87 typedef struct dso_meth_st
90 /* Loads a shared library */
91 int (*dso_load)(DSO *dso, const char *filename);
92 /* Unloads a shared library */
93 int (*dso_unload)(DSO *dso);
94 /* Binds a variable */
95 void *(*dso_bind_var)(DSO *dso, const char *symname);
96 /* Binds a function - assumes a return type of DSO_FUNC_TYPE.
97 * This should be cast to the real function prototype by the
98 * caller. Platforms that don't have compatible representations
99 * for different prototypes (this is possible within ANSI C)
100 * are highly unlikely to have shared libraries at all, let
101 * alone a DSO_METHOD implemented for them. */
102 DSO_FUNC_TYPE (*dso_bind_func)(DSO *dso, const char *symname);
104 /* I don't think this would actually be used in any circumstances. */
106 /* Unbinds a variable */
107 int (*dso_unbind_var)(DSO *dso, char *symname, void *symptr);
108 /* Unbinds a function */
109 int (*dso_unbind_func)(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
111 /* The generic (yuck) "ctrl()" function. NB: Negative return
112 * values (rather than zero) indicate errors. */
113 long (*dso_ctrl)(DSO *dso, int cmd, long larg, void *parg);
115 /* [De]Initialisation handlers. */
116 int (*init)(DSO *dso);
117 int (*finish)(DSO *dso);
120 /**********************************************************************/
121 /* The low-level handle type used to refer to a loaded shared library */
126 /* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS
127 * doesn't use anything but will need to cache the filename
128 * for use in the dso_bind handler. All in all, let each
129 * method control its own destiny. "Handles" and such go in
134 /* For use by applications etc ... use this for your bits'n'pieces,
135 * don't touch meth_data! */
136 CRYPTO_EX_DATA ex_data;
141 DSO * DSO_new_method(DSO_METHOD *method);
142 int DSO_free(DSO *dso);
143 int DSO_flags(DSO *dso);
144 int DSO_up(DSO *dso);
145 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);
147 void DSO_set_default_method(DSO_METHOD *meth);
148 DSO_METHOD *DSO_get_default_method(void);
149 DSO_METHOD *DSO_get_method(DSO *dso);
150 DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);
152 /* The all-singing all-dancing load function, you normally pass NULL
153 * for the first and third parameters. Use DSO_up and DSO_free for
154 * subsequent reference count handling. Any flags passed in will be set
155 * in the constructed DSO after its init() function but before the
156 * load operation. This will be done with;
157 * DSO_ctrl(dso, DSO_CTRL_SET_FLAGS, flags, NULL); */
158 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);
160 /* This function binds to a variable inside a shared library. */
161 void *DSO_bind_var(DSO *dso, const char *symname);
163 /* This function binds to a function inside a shared library. */
164 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname);
166 /* This method is the default, but will beg, borrow, or steal whatever
167 * method should be the default on any particular platform (including
168 * DSO_METH_null() if necessary). */
169 DSO_METHOD *DSO_METHOD_openssl(void);
171 /* This method is defined for all platforms - if a platform has no
172 * DSO support then this will be the only method! */
173 DSO_METHOD *DSO_METHOD_null(void);
175 /* If DSO_DLFCN is defined, the standard dlfcn.h-style functions
176 * (dlopen, dlclose, dlsym, etc) will be used and incorporated into
177 * this method. If not, this method will return NULL. */
178 DSO_METHOD *DSO_METHOD_dlfcn(void);
180 /* If DSO_DL is defined, the standard dl.h-style functions (shl_load,
181 * shl_unload, shl_findsym, etc) will be used and incorporated into
182 * this method. If not, this method will return NULL. */
183 DSO_METHOD *DSO_METHOD_dl(void);
185 /* If WIN32 is defined, use DLLs. If not, return NULL. */
186 DSO_METHOD *DSO_METHOD_win32(void);
188 void ERR_load_DSO_strings(void);
190 /* BEGIN ERROR CODES */
191 /* The following lines are auto generated by the script mkerr.pl. Any changes
192 * made after this point may be overwritten when the script is next run.
195 /* Error codes for the DSO functions. */
197 /* Function codes. */
198 #define DSO_F_DLFCN_BIND_FUNC 100
199 #define DSO_F_DLFCN_BIND_VAR 101
200 #define DSO_F_DLFCN_CTRL 102
201 #define DSO_F_DLFCN_LOAD 103
202 #define DSO_F_DLFCN_UNLOAD 104
203 #define DSO_F_DL_BIND_FUNC 105
204 #define DSO_F_DL_BIND_VAR 106
205 #define DSO_F_DL_CTRL 107
206 #define DSO_F_DL_LOAD 108
207 #define DSO_F_DL_UNLOAD 109
208 #define DSO_F_DSO_BIND_FUNC 110
209 #define DSO_F_DSO_BIND_VAR 111
210 #define DSO_F_DSO_CTRL 112
211 #define DSO_F_DSO_FREE 113
212 #define DSO_F_DSO_LOAD 114
213 #define DSO_F_DSO_NEW_METHOD 115
214 #define DSO_F_DSO_UP 116
215 #define DSO_F_WIN32_BIND_FUNC 117
216 #define DSO_F_WIN32_BIND_VAR 118
217 #define DSO_F_WIN32_CTRL 119
218 #define DSO_F_WIN32_LOAD 120
219 #define DSO_F_WIN32_UNLOAD 121
222 #define DSO_R_CTRL_FAILED 100
223 #define DSO_R_FINISH_FAILED 101
224 #define DSO_R_LOAD_FAILED 102
225 #define DSO_R_NULL_HANDLE 103
226 #define DSO_R_STACK_ERROR 104
227 #define DSO_R_SYM_FAILURE 105
228 #define DSO_R_UNKNOWN_COMMAND 106
229 #define DSO_R_UNLOAD_FAILED 107
230 #define DSO_R_UNSUPPORTED 108