2 * Copyright 2000-2017 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
11 #include "internal/refcount.h"
13 static DSO_METHOD *default_DSO_meth = NULL;
15 static DSO *DSO_new_method(DSO_METHOD *meth)
19 if (default_DSO_meth == NULL) {
21 * We default to DSO_METH_openssl() which in turn defaults to
22 * stealing the "best available" method. Will fallback to
23 * DSO_METH_null() in the worst case.
25 default_DSO_meth = DSO_METHOD_openssl();
27 ret = OPENSSL_zalloc(sizeof(*ret));
29 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
32 ret->meth_data = sk_void_new_null();
33 if (ret->meth_data == NULL) {
34 /* sk_new doesn't generate any errors so we do */
35 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
39 ret->meth = default_DSO_meth;
41 ret->lock = CRYPTO_THREAD_lock_new();
42 if (ret->lock == NULL) {
43 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
44 sk_void_free(ret->meth_data);
49 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
59 return DSO_new_method(NULL);
62 int DSO_free(DSO *dso)
69 if (CRYPTO_DOWN_REF(&dso->references, &i, dso->lock) <= 0)
72 REF_PRINT_COUNT("DSO", dso);
75 REF_ASSERT_ISNT(i < 0);
77 if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
78 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
79 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
84 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
85 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
89 sk_void_free(dso->meth_data);
90 OPENSSL_free(dso->filename);
91 OPENSSL_free(dso->loaded_filename);
92 CRYPTO_THREAD_lock_free(dso->lock);
97 int DSO_flags(DSO *dso)
99 return ((dso == NULL) ? 0 : dso->flags);
102 int DSO_up_ref(DSO *dso)
107 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
111 if (CRYPTO_UP_REF(&dso->references, &i, dso->lock) <= 0)
114 REF_PRINT_COUNT("DSO", r);
115 REF_ASSERT_ISNT(i < 2);
116 return ((i > 1) ? 1 : 0);
119 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
125 ret = DSO_new_method(meth);
127 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
131 /* Pass the provided flags to the new DSO object */
132 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
133 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
138 /* Don't load if we're currently already loaded */
139 if (ret->filename != NULL) {
140 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
144 * filename can only be NULL if we were passed a dso that already has one
147 if (filename != NULL)
148 if (!DSO_set_filename(ret, filename)) {
149 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
152 filename = ret->filename;
153 if (filename == NULL) {
154 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
157 if (ret->meth->dso_load == NULL) {
158 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
161 if (!ret->meth->dso_load(ret)) {
162 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
173 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
175 DSO_FUNC_TYPE ret = NULL;
177 if ((dso == NULL) || (symname == NULL)) {
178 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
181 if (dso->meth->dso_bind_func == NULL) {
182 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
185 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
186 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
194 * I don't really like these *_ctrl functions very much to be perfectly
195 * honest. For one thing, I think I have to return a negative value for any
196 * error because possible DSO_ctrl() commands may return values such as
197 * "size"s that can legitimately be zero (making the standard
198 * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
199 * times. I'd prefer "output" values to be passed by reference and the return
200 * value as success/failure like usual ... but we conform when we must... :-)
202 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
205 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
209 * We should intercept certain generic commands and only pass control to
210 * the method-specific ctrl() function if it's something we don't handle.
213 case DSO_CTRL_GET_FLAGS:
215 case DSO_CTRL_SET_FLAGS:
216 dso->flags = (int)larg;
218 case DSO_CTRL_OR_FLAGS:
219 dso->flags |= (int)larg;
224 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
225 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
228 return dso->meth->dso_ctrl(dso, cmd, larg, parg);
231 const char *DSO_get_filename(DSO *dso)
234 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
237 return dso->filename;
240 int DSO_set_filename(DSO *dso, const char *filename)
244 if ((dso == NULL) || (filename == NULL)) {
245 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
248 if (dso->loaded_filename) {
249 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
252 /* We'll duplicate filename */
253 copied = OPENSSL_strdup(filename);
254 if (copied == NULL) {
255 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
258 OPENSSL_free(dso->filename);
259 dso->filename = copied;
263 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
267 if (dso == NULL || filespec1 == NULL) {
268 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
271 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
272 if (dso->merger != NULL)
273 result = dso->merger(dso, filespec1, filespec2);
274 else if (dso->meth->dso_merger != NULL)
275 result = dso->meth->dso_merger(dso, filespec1, filespec2);
280 char *DSO_convert_filename(DSO *dso, const char *filename)
285 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
288 if (filename == NULL)
289 filename = dso->filename;
290 if (filename == NULL) {
291 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
294 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
295 if (dso->name_converter != NULL)
296 result = dso->name_converter(dso, filename);
297 else if (dso->meth->dso_name_converter != NULL)
298 result = dso->meth->dso_name_converter(dso, filename);
300 if (result == NULL) {
301 result = OPENSSL_strdup(filename);
302 if (result == NULL) {
303 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
310 int DSO_pathbyaddr(void *addr, char *path, int sz)
312 DSO_METHOD *meth = default_DSO_meth;
314 meth = DSO_METHOD_openssl();
315 if (meth->pathbyaddr == NULL) {
316 DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED);
319 return (*meth->pathbyaddr) (addr, path, sz);
322 DSO *DSO_dsobyaddr(void *addr, int flags)
325 char *filename = NULL;
326 int len = DSO_pathbyaddr(addr, NULL, 0);
331 filename = OPENSSL_malloc(len);
333 && DSO_pathbyaddr(addr, filename, len) == len)
334 ret = DSO_load(NULL, filename, NULL, flags);
336 OPENSSL_free(filename);
340 void *DSO_global_lookup(const char *name)
342 DSO_METHOD *meth = default_DSO_meth;
344 meth = DSO_METHOD_openssl();
345 if (meth->globallookup == NULL) {
346 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
349 return (*meth->globallookup) (name);