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 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
43 sk_void_free(ret->meth_data);
48 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
58 return DSO_new_method(NULL);
61 int DSO_free(DSO *dso)
68 if (CRYPTO_atomic_add(&dso->references, -1, &i, dso->lock) <= 0)
71 REF_PRINT_COUNT("DSO", dso);
74 REF_ASSERT_ISNT(i < 0);
76 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
77 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
81 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
82 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
86 sk_void_free(dso->meth_data);
87 OPENSSL_free(dso->filename);
88 OPENSSL_free(dso->loaded_filename);
89 CRYPTO_THREAD_lock_free(dso->lock);
94 int DSO_flags(DSO *dso)
96 return ((dso == NULL) ? 0 : dso->flags);
99 int DSO_up_ref(DSO *dso)
104 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
108 if (CRYPTO_atomic_add(&dso->references, 1, &i, dso->lock) <= 0)
111 REF_PRINT_COUNT("DSO", r);
112 REF_ASSERT_ISNT(i < 2);
113 return ((i > 1) ? 1 : 0);
116 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
122 ret = DSO_new_method(meth);
124 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
128 /* Pass the provided flags to the new DSO object */
129 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
130 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
135 /* Don't load if we're currently already loaded */
136 if (ret->filename != NULL) {
137 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
141 * filename can only be NULL if we were passed a dso that already has one
144 if (filename != NULL)
145 if (!DSO_set_filename(ret, filename)) {
146 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
149 filename = ret->filename;
150 if (filename == NULL) {
151 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
154 if (ret->meth->dso_load == NULL) {
155 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
158 if (!ret->meth->dso_load(ret)) {
159 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
170 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
172 DSO_FUNC_TYPE ret = NULL;
174 if ((dso == NULL) || (symname == NULL)) {
175 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
178 if (dso->meth->dso_bind_func == NULL) {
179 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
182 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
183 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
191 * I don't really like these *_ctrl functions very much to be perfectly
192 * honest. For one thing, I think I have to return a negative value for any
193 * error because possible DSO_ctrl() commands may return values such as
194 * "size"s that can legitimately be zero (making the standard
195 * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
196 * times. I'd prefer "output" values to be passed by reference and the return
197 * value as success/failure like usual ... but we conform when we must... :-)
199 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
202 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
206 * We should intercept certain generic commands and only pass control to
207 * the method-specific ctrl() function if it's something we don't handle.
210 case DSO_CTRL_GET_FLAGS:
212 case DSO_CTRL_SET_FLAGS:
213 dso->flags = (int)larg;
215 case DSO_CTRL_OR_FLAGS:
216 dso->flags |= (int)larg;
221 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
222 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
225 return (dso->meth->dso_ctrl(dso, cmd, larg, parg));
228 const char *DSO_get_filename(DSO *dso)
231 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
234 return (dso->filename);
237 int DSO_set_filename(DSO *dso, const char *filename)
241 if ((dso == NULL) || (filename == NULL)) {
242 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
245 if (dso->loaded_filename) {
246 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
249 /* We'll duplicate filename */
250 copied = OPENSSL_strdup(filename);
251 if (copied == NULL) {
252 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
255 OPENSSL_free(dso->filename);
256 dso->filename = copied;
260 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
264 if (dso == NULL || filespec1 == NULL) {
265 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
268 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
269 if (dso->merger != NULL)
270 result = dso->merger(dso, filespec1, filespec2);
271 else if (dso->meth->dso_merger != NULL)
272 result = dso->meth->dso_merger(dso, filespec1, filespec2);
277 char *DSO_convert_filename(DSO *dso, const char *filename)
282 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
285 if (filename == NULL)
286 filename = dso->filename;
287 if (filename == NULL) {
288 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
291 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
292 if (dso->name_converter != NULL)
293 result = dso->name_converter(dso, filename);
294 else if (dso->meth->dso_name_converter != NULL)
295 result = dso->meth->dso_name_converter(dso, filename);
297 if (result == NULL) {
298 result = OPENSSL_strdup(filename);
299 if (result == NULL) {
300 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
307 void *DSO_global_lookup(const char *name)
309 DSO_METHOD *meth = default_DSO_meth;
311 meth = DSO_METHOD_openssl();
312 if (meth->globallookup == NULL) {
313 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
316 return (*meth->globallookup) (name);