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->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
77 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
78 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
83 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
84 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
88 sk_void_free(dso->meth_data);
89 OPENSSL_free(dso->filename);
90 OPENSSL_free(dso->loaded_filename);
91 CRYPTO_THREAD_lock_free(dso->lock);
96 int DSO_flags(DSO *dso)
98 return ((dso == NULL) ? 0 : dso->flags);
101 int DSO_up_ref(DSO *dso)
106 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
110 if (CRYPTO_atomic_add(&dso->references, 1, &i, dso->lock) <= 0)
113 REF_PRINT_COUNT("DSO", r);
114 REF_ASSERT_ISNT(i < 2);
115 return ((i > 1) ? 1 : 0);
118 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
124 ret = DSO_new_method(meth);
126 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
130 /* Pass the provided flags to the new DSO object */
131 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
132 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
137 /* Don't load if we're currently already loaded */
138 if (ret->filename != NULL) {
139 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
143 * filename can only be NULL if we were passed a dso that already has one
146 if (filename != NULL)
147 if (!DSO_set_filename(ret, filename)) {
148 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
151 filename = ret->filename;
152 if (filename == NULL) {
153 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
156 if (ret->meth->dso_load == NULL) {
157 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
160 if (!ret->meth->dso_load(ret)) {
161 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
172 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
174 DSO_FUNC_TYPE ret = NULL;
176 if ((dso == NULL) || (symname == NULL)) {
177 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
180 if (dso->meth->dso_bind_func == NULL) {
181 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
184 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
185 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
193 * I don't really like these *_ctrl functions very much to be perfectly
194 * honest. For one thing, I think I have to return a negative value for any
195 * error because possible DSO_ctrl() commands may return values such as
196 * "size"s that can legitimately be zero (making the standard
197 * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
198 * times. I'd prefer "output" values to be passed by reference and the return
199 * value as success/failure like usual ... but we conform when we must... :-)
201 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
204 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
208 * We should intercept certain generic commands and only pass control to
209 * the method-specific ctrl() function if it's something we don't handle.
212 case DSO_CTRL_GET_FLAGS:
214 case DSO_CTRL_SET_FLAGS:
215 dso->flags = (int)larg;
217 case DSO_CTRL_OR_FLAGS:
218 dso->flags |= (int)larg;
223 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
224 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
227 return (dso->meth->dso_ctrl(dso, cmd, larg, parg));
230 const char *DSO_get_filename(DSO *dso)
233 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
236 return (dso->filename);
239 int DSO_set_filename(DSO *dso, const char *filename)
243 if ((dso == NULL) || (filename == NULL)) {
244 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
247 if (dso->loaded_filename) {
248 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
251 /* We'll duplicate filename */
252 copied = OPENSSL_strdup(filename);
253 if (copied == NULL) {
254 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
257 OPENSSL_free(dso->filename);
258 dso->filename = copied;
262 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
266 if (dso == NULL || filespec1 == NULL) {
267 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
270 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
271 if (dso->merger != NULL)
272 result = dso->merger(dso, filespec1, filespec2);
273 else if (dso->meth->dso_merger != NULL)
274 result = dso->meth->dso_merger(dso, filespec1, filespec2);
279 char *DSO_convert_filename(DSO *dso, const char *filename)
284 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
287 if (filename == NULL)
288 filename = dso->filename;
289 if (filename == NULL) {
290 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
293 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
294 if (dso->name_converter != NULL)
295 result = dso->name_converter(dso, filename);
296 else if (dso->meth->dso_name_converter != NULL)
297 result = dso->meth->dso_name_converter(dso, filename);
299 if (result == NULL) {
300 result = OPENSSL_strdup(filename);
301 if (result == NULL) {
302 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
309 int DSO_pathbyaddr(void *addr, char *path, int sz)
311 DSO_METHOD *meth = default_DSO_meth;
313 meth = DSO_METHOD_openssl();
314 if (meth->pathbyaddr == NULL) {
315 DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED);
318 return (*meth->pathbyaddr) (addr, path, sz);
321 DSO *DSO_dsobyaddr(void *addr, int flags)
324 char *filename = NULL;
325 int len = DSO_pathbyaddr(addr, NULL, 0);
327 filename = OPENSSL_malloc(len);
329 && DSO_pathbyaddr(addr, filename, len) == len)
330 ret = DSO_load(NULL, filename, NULL, flags);
332 OPENSSL_free(filename);
336 void *DSO_global_lookup(const char *name)
338 DSO_METHOD *meth = default_DSO_meth;
340 meth = DSO_METHOD_openssl();
341 if (meth->globallookup == NULL) {
342 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
345 return (*meth->globallookup) (name);