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1/* dso.h */
2/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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
18 * distribution.
19 *
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/)"
24 *
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.
29 *
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.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
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 * ====================================================================
52 *
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).
56 *
57 */
58
59#ifndef HEADER_DSO_H
60#define HEADER_DSO_H
61
62#include <openssl/crypto.h>
63
64#ifdef __cplusplus
65extern "C" {
66#endif
67
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
72
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.
80 */
81#define DSO_FLAG_NAME_TRANSLATION 0x01
82
83/* The following flag controls the translation of symbol names to upper
84 * case. This is currently only being implemented for OpenVMS.
85 */
86#define DSO_FLAG_UPCASE_SYMBOL 0x02
87
88
89typedef void (*DSO_FUNC_TYPE)(void);
90
91typedef struct dso_st DSO;
92
93typedef struct dso_meth_st
94 {
95 const char *name;
96 /* Loads a shared library */
97 int (*dso_load)(DSO *dso, const char *filename);
98 /* Unloads a shared library */
99 int (*dso_unload)(DSO *dso);
100 /* Binds a variable */
101 void *(*dso_bind_var)(DSO *dso, const char *symname);
102 /* Binds a function - assumes a return type of DSO_FUNC_TYPE.
103 * This should be cast to the real function prototype by the
104 * caller. Platforms that don't have compatible representations
105 * for different prototypes (this is possible within ANSI C)
106 * are highly unlikely to have shared libraries at all, let
107 * alone a DSO_METHOD implemented for them. */
108 DSO_FUNC_TYPE (*dso_bind_func)(DSO *dso, const char *symname);
109
110/* I don't think this would actually be used in any circumstances. */
111#if 0
112 /* Unbinds a variable */
113 int (*dso_unbind_var)(DSO *dso, char *symname, void *symptr);
114 /* Unbinds a function */
115 int (*dso_unbind_func)(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
116#endif
117 /* The generic (yuck) "ctrl()" function. NB: Negative return
118 * values (rather than zero) indicate errors. */
119 long (*dso_ctrl)(DSO *dso, int cmd, long larg, void *parg);
120
121 /* [De]Initialisation handlers. */
122 int (*init)(DSO *dso);
123 int (*finish)(DSO *dso);
124 } DSO_METHOD;
125
126/**********************************************************************/
127/* The low-level handle type used to refer to a loaded shared library */
128
129struct dso_st
130 {
131 DSO_METHOD *meth;
132 /* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS
133 * doesn't use anything but will need to cache the filename
134 * for use in the dso_bind handler. All in all, let each
135 * method control its own destiny. "Handles" and such go in
136 * a STACK. */
137 STACK *meth_data;
138 int references;
139 int flags;
140 /* For use by applications etc ... use this for your bits'n'pieces,
141 * don't touch meth_data! */
142 CRYPTO_EX_DATA ex_data;
143 };
144
145
146DSO * DSO_new(void);
147DSO * DSO_new_method(DSO_METHOD *method);
148int DSO_free(DSO *dso);
149int DSO_flags(DSO *dso);
150int DSO_up(DSO *dso);
151long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);
152
153void DSO_set_default_method(DSO_METHOD *meth);
154DSO_METHOD *DSO_get_default_method(void);
155DSO_METHOD *DSO_get_method(DSO *dso);
156DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);
157
158/* The all-singing all-dancing load function, you normally pass NULL
159 * for the first and third parameters. Use DSO_up and DSO_free for
160 * subsequent reference count handling. Any flags passed in will be set
161 * in the constructed DSO after its init() function but before the
162 * load operation. This will be done with;
163 * DSO_ctrl(dso, DSO_CTRL_SET_FLAGS, flags, NULL); */
164DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);
165
166/* This function binds to a variable inside a shared library. */
167void *DSO_bind_var(DSO *dso, const char *symname);
168
169/* This function binds to a function inside a shared library. */
170DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname);
171
172/* This method is the default, but will beg, borrow, or steal whatever
173 * method should be the default on any particular platform (including
174 * DSO_METH_null() if necessary). */
175DSO_METHOD *DSO_METHOD_openssl(void);
176
177/* This method is defined for all platforms - if a platform has no
178 * DSO support then this will be the only method! */
179DSO_METHOD *DSO_METHOD_null(void);
180
181/* If DSO_DLFCN is defined, the standard dlfcn.h-style functions
182 * (dlopen, dlclose, dlsym, etc) will be used and incorporated into
183 * this method. If not, this method will return NULL. */
184DSO_METHOD *DSO_METHOD_dlfcn(void);
185
186/* If DSO_DL is defined, the standard dl.h-style functions (shl_load,
187 * shl_unload, shl_findsym, etc) will be used and incorporated into
188 * this method. If not, this method will return NULL. */
189DSO_METHOD *DSO_METHOD_dl(void);
190
191/* If WIN32 is defined, use DLLs. If not, return NULL. */
192DSO_METHOD *DSO_METHOD_win32(void);
193
194/* If VMS is defined, use shared images. If not, return NULL. */
195DSO_METHOD *DSO_METHOD_vms(void);
196
197void ERR_load_DSO_strings(void);
198
199/* BEGIN ERROR CODES */
200/* The following lines are auto generated by the script mkerr.pl. Any changes
201 * made after this point may be overwritten when the script is next run.
202 */
203
204/* Error codes for the DSO functions. */
205
206/* Function codes. */
207#define DSO_F_DLFCN_BIND_FUNC 100
208#define DSO_F_DLFCN_BIND_VAR 101
209#define DSO_F_DLFCN_CTRL 102
210#define DSO_F_DLFCN_LOAD 103
211#define DSO_F_DLFCN_UNLOAD 104
212#define DSO_F_DL_BIND_FUNC 105
213#define DSO_F_DL_BIND_VAR 106
214#define DSO_F_DL_CTRL 107
215#define DSO_F_DL_LOAD 108
216#define DSO_F_DL_UNLOAD 109
217#define DSO_F_DSO_BIND_FUNC 110
218#define DSO_F_DSO_BIND_VAR 111
219#define DSO_F_DSO_CTRL 112
220#define DSO_F_DSO_FREE 113
221#define DSO_F_DSO_LOAD 114
222#define DSO_F_DSO_NEW_METHOD 115
223#define DSO_F_DSO_UP 116
224#define DSO_F_VMS_BIND_VAR 122
225#define DSO_F_VMS_CTRL 123
226#define DSO_F_VMS_LOAD 124
227#define DSO_F_VMS_UNLOAD 125
228#define DSO_F_WIN32_BIND_FUNC 117
229#define DSO_F_WIN32_BIND_VAR 118
230#define DSO_F_WIN32_CTRL 119
231#define DSO_F_WIN32_LOAD 120
232#define DSO_F_WIN32_UNLOAD 121
233
234/* Reason codes. */
235#define DSO_R_CTRL_FAILED 100
236#define DSO_R_FILENAME_TOO_BIG 109
237#define DSO_R_FINISH_FAILED 101
238#define DSO_R_LOAD_FAILED 102
239#define DSO_R_NULL_HANDLE 103
240#define DSO_R_STACK_ERROR 104
241#define DSO_R_SYM_FAILURE 105
242#define DSO_R_UNKNOWN_COMMAND 106
243#define DSO_R_UNLOAD_FAILED 107
244#define DSO_R_UNSUPPORTED 108
245
246#ifdef __cplusplus
247}
248#endif
249#endif
250
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