2 * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 static DSO_METHOD *default_DSO_meth = NULL;
14 static DSO *DSO_new_method(DSO_METHOD *meth)
18 if (default_DSO_meth == NULL) {
20 * We default to DSO_METH_openssl() which in turn defaults to
21 * stealing the "best available" method. Will fallback to
22 * DSO_METH_null() in the worst case.
24 default_DSO_meth = DSO_METHOD_openssl();
26 ret = OPENSSL_zalloc(sizeof(*ret));
28 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
31 ret->meth_data = sk_void_new_null();
32 if (ret->meth_data == NULL) {
33 /* sk_new doesn't generate any errors so we do */
34 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
38 ret->meth = default_DSO_meth;
40 ret->lock = CRYPTO_THREAD_lock_new();
41 if (ret->lock == NULL) {
42 sk_void_free(ret->meth_data);
47 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
57 return DSO_new_method(NULL);
60 int DSO_free(DSO *dso)
67 if (CRYPTO_atomic_add(&dso->references, -1, &i, dso->lock) <= 0)
70 REF_PRINT_COUNT("DSO", dso);
73 REF_ASSERT_ISNT(i < 0);
75 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
76 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
80 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
81 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
85 sk_void_free(dso->meth_data);
86 OPENSSL_free(dso->filename);
87 OPENSSL_free(dso->loaded_filename);
88 CRYPTO_THREAD_lock_free(dso->lock);
93 int DSO_flags(DSO *dso)
95 return ((dso == NULL) ? 0 : dso->flags);
98 int DSO_up_ref(DSO *dso)
103 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
107 if (CRYPTO_atomic_add(&dso->references, 1, &i, dso->lock) <= 0)
110 REF_PRINT_COUNT("DSO", r);
111 REF_ASSERT_ISNT(i < 2);
112 return ((i > 1) ? 1 : 0);
115 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
121 ret = DSO_new_method(meth);
123 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
127 /* Pass the provided flags to the new DSO object */
128 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
129 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
134 /* Don't load if we're currently already loaded */
135 if (ret->filename != NULL) {
136 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
140 * filename can only be NULL if we were passed a dso that already has one
143 if (filename != NULL)
144 if (!DSO_set_filename(ret, filename)) {
145 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
148 filename = ret->filename;
149 if (filename == NULL) {
150 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
153 if (ret->meth->dso_load == NULL) {
154 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
157 if (!ret->meth->dso_load(ret)) {
158 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
169 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
171 DSO_FUNC_TYPE ret = NULL;
173 if ((dso == NULL) || (symname == NULL)) {
174 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
177 if (dso->meth->dso_bind_func == NULL) {
178 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
181 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
182 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
190 * I don't really like these *_ctrl functions very much to be perfectly
191 * honest. For one thing, I think I have to return a negative value for any
192 * error because possible DSO_ctrl() commands may return values such as
193 * "size"s that can legitimately be zero (making the standard
194 * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
195 * times. I'd prefer "output" values to be passed by reference and the return
196 * value as success/failure like usual ... but we conform when we must... :-)
198 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
201 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
205 * We should intercept certain generic commands and only pass control to
206 * the method-specific ctrl() function if it's something we don't handle.
209 case DSO_CTRL_GET_FLAGS:
211 case DSO_CTRL_SET_FLAGS:
212 dso->flags = (int)larg;
214 case DSO_CTRL_OR_FLAGS:
215 dso->flags |= (int)larg;
220 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
221 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
224 return (dso->meth->dso_ctrl(dso, cmd, larg, parg));
227 const char *DSO_get_filename(DSO *dso)
230 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
233 return (dso->filename);
236 int DSO_set_filename(DSO *dso, const char *filename)
240 if ((dso == NULL) || (filename == NULL)) {
241 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
244 if (dso->loaded_filename) {
245 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
248 /* We'll duplicate filename */
249 copied = OPENSSL_strdup(filename);
250 if (copied == NULL) {
251 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
254 OPENSSL_free(dso->filename);
255 dso->filename = copied;
259 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
263 if (dso == NULL || filespec1 == NULL) {
264 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
267 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
268 if (dso->merger != NULL)
269 result = dso->merger(dso, filespec1, filespec2);
270 else if (dso->meth->dso_merger != NULL)
271 result = dso->meth->dso_merger(dso, filespec1, filespec2);
276 char *DSO_convert_filename(DSO *dso, const char *filename)
281 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
284 if (filename == NULL)
285 filename = dso->filename;
286 if (filename == NULL) {
287 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
290 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
291 if (dso->name_converter != NULL)
292 result = dso->name_converter(dso, filename);
293 else if (dso->meth->dso_name_converter != NULL)
294 result = dso->meth->dso_name_converter(dso, filename);
296 if (result == NULL) {
297 result = OPENSSL_strdup(filename);
298 if (result == NULL) {
299 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
306 void *DSO_global_lookup(const char *name)
308 DSO_METHOD *meth = default_DSO_meth;
310 meth = DSO_METHOD_openssl();
311 if (meth->globallookup == NULL) {
312 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
315 return (*meth->globallookup) (name);