2 * Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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
10 #include "dso_local.h"
11 #include "internal/refcount.h"
15 static DSO_METHOD *default_DSO_meth = NULL;
17 static DSO *DSO_new_method(DSO_METHOD *meth)
21 if (default_DSO_meth == NULL) {
23 * We default to DSO_METH_openssl() which in turn defaults to
24 * stealing the "best available" method. Will fallback to
25 * DSO_METH_null() in the worst case.
27 default_DSO_meth = DSO_METHOD_openssl();
29 ret = OPENSSL_zalloc(sizeof(*ret));
31 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
34 ret->meth_data = sk_void_new_null();
35 if (ret->meth_data == NULL) {
36 /* sk_new doesn't generate any errors so we do */
37 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
41 ret->meth = default_DSO_meth;
43 ret->lock = CRYPTO_THREAD_lock_new();
44 if (ret->lock == NULL) {
45 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
46 sk_void_free(ret->meth_data);
51 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
61 return DSO_new_method(NULL);
64 int DSO_free(DSO *dso)
71 if (CRYPTO_DOWN_REF(&dso->references, &i, dso->lock) <= 0)
74 REF_PRINT_COUNT("DSO", dso);
77 REF_ASSERT_ISNT(i < 0);
79 if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
80 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
81 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
86 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
87 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
91 sk_void_free(dso->meth_data);
92 OPENSSL_free(dso->filename);
93 OPENSSL_free(dso->loaded_filename);
94 CRYPTO_THREAD_lock_free(dso->lock);
99 int DSO_flags(DSO *dso)
101 return ((dso == NULL) ? 0 : dso->flags);
104 int DSO_up_ref(DSO *dso)
109 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
113 if (CRYPTO_UP_REF(&dso->references, &i, dso->lock) <= 0)
116 REF_PRINT_COUNT("DSO", dso);
117 REF_ASSERT_ISNT(i < 2);
118 return ((i > 1) ? 1 : 0);
121 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
127 ret = DSO_new_method(meth);
129 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
133 /* Pass the provided flags to the new DSO object */
134 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
135 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
140 /* Don't load if we're currently already loaded */
141 if (ret->filename != NULL) {
142 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
146 * filename can only be NULL if we were passed a dso that already has one
149 if (filename != NULL)
150 if (!DSO_set_filename(ret, filename)) {
151 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
154 filename = ret->filename;
155 if (filename == NULL) {
156 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
159 if (ret->meth->dso_load == NULL) {
160 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
163 if (!ret->meth->dso_load(ret)) {
164 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
175 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
177 DSO_FUNC_TYPE ret = NULL;
179 if ((dso == NULL) || (symname == NULL)) {
180 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
183 if (dso->meth->dso_bind_func == NULL) {
184 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
187 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
188 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
196 * I don't really like these *_ctrl functions very much to be perfectly
197 * honest. For one thing, I think I have to return a negative value for any
198 * error because possible DSO_ctrl() commands may return values such as
199 * "size"s that can legitimately be zero (making the standard
200 * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
201 * times. I'd prefer "output" values to be passed by reference and the return
202 * value as success/failure like usual ... but we conform when we must... :-)
204 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
207 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
211 * We should intercept certain generic commands and only pass control to
212 * the method-specific ctrl() function if it's something we don't handle.
215 case DSO_CTRL_GET_FLAGS:
217 case DSO_CTRL_SET_FLAGS:
218 dso->flags = (int)larg;
220 case DSO_CTRL_OR_FLAGS:
221 dso->flags |= (int)larg;
226 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
227 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
230 return dso->meth->dso_ctrl(dso, cmd, larg, parg);
233 const char *DSO_get_filename(DSO *dso)
236 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
239 return dso->filename;
242 int DSO_set_filename(DSO *dso, const char *filename)
246 if ((dso == NULL) || (filename == NULL)) {
247 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
250 if (dso->loaded_filename) {
251 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
254 /* We'll duplicate filename */
255 copied = OPENSSL_strdup(filename);
256 if (copied == NULL) {
257 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
260 OPENSSL_free(dso->filename);
261 dso->filename = copied;
265 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
269 if (dso == NULL || filespec1 == NULL) {
270 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
273 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
274 if (dso->merger != NULL)
275 result = dso->merger(dso, filespec1, filespec2);
276 else if (dso->meth->dso_merger != NULL)
277 result = dso->meth->dso_merger(dso, filespec1, filespec2);
282 char *DSO_convert_filename(DSO *dso, const char *filename)
287 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
290 if (filename == NULL)
291 filename = dso->filename;
292 if (filename == NULL) {
293 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
296 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
297 if (dso->name_converter != NULL)
298 result = dso->name_converter(dso, filename);
299 else if (dso->meth->dso_name_converter != NULL)
300 result = dso->meth->dso_name_converter(dso, filename);
302 if (result == NULL) {
303 result = OPENSSL_strdup(filename);
304 if (result == NULL) {
305 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
312 int DSO_pathbyaddr(void *addr, char *path, int sz)
314 DSO_METHOD *meth = default_DSO_meth;
316 meth = DSO_METHOD_openssl();
317 if (meth->pathbyaddr == NULL) {
318 DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED);
321 return (*meth->pathbyaddr) (addr, path, sz);
324 DSO *DSO_dsobyaddr(void *addr, int flags)
327 char *filename = NULL;
328 int len = DSO_pathbyaddr(addr, NULL, 0);
333 filename = OPENSSL_malloc(len);
335 && DSO_pathbyaddr(addr, filename, len) == len)
336 ret = DSO_load(NULL, filename, NULL, flags);
338 OPENSSL_free(filename);
342 void *DSO_global_lookup(const char *name)
344 DSO_METHOD *meth = default_DSO_meth;
346 meth = DSO_METHOD_openssl();
347 if (meth->globallookup == NULL) {
348 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
351 return (*meth->globallookup) (name);