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/*
* Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "dso_local.h"
#include "internal/refcount.h"
static DSO *DSO_new_method(DSO_METHOD *meth)
{
DSO *ret;
ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL)
return NULL;
ret->meth_data = sk_void_new_null();
if (ret->meth_data == NULL) {
/* sk_new doesn't generate any errors so we do */
ERR_raise(ERR_LIB_DSO, ERR_R_CRYPTO_LIB);
OPENSSL_free(ret);
return NULL;
}
ret->meth = DSO_METHOD_openssl();
if (!CRYPTO_NEW_REF(&ret->references, 1)) {
sk_void_free(ret->meth_data);
OPENSSL_free(ret);
return NULL;
}
if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
DSO_free(ret);
ret = NULL;
}
return ret;
}
DSO *DSO_new(void)
{
return DSO_new_method(NULL);
}
int DSO_free(DSO *dso)
{
int i;
if (dso == NULL)
return 1;
if (CRYPTO_DOWN_REF(&dso->references, &i) <= 0)
return 0;
REF_PRINT_COUNT("DSO", dso);
if (i > 0)
return 1;
REF_ASSERT_ISNT(i < 0);
if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
ERR_raise(ERR_LIB_DSO, DSO_R_UNLOAD_FAILED);
return 0;
}
}
if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
ERR_raise(ERR_LIB_DSO, DSO_R_FINISH_FAILED);
return 0;
}
sk_void_free(dso->meth_data);
OPENSSL_free(dso->filename);
OPENSSL_free(dso->loaded_filename);
CRYPTO_FREE_REF(&dso->references);
OPENSSL_free(dso);
return 1;
}
int DSO_flags(DSO *dso)
{
return ((dso == NULL) ? 0 : dso->flags);
}
int DSO_up_ref(DSO *dso)
{
int i;
if (dso == NULL) {
ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (CRYPTO_UP_REF(&dso->references, &i) <= 0)
return 0;
REF_PRINT_COUNT("DSO", dso);
REF_ASSERT_ISNT(i < 2);
return ((i > 1) ? 1 : 0);
}
DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
{
DSO *ret;
int allocated = 0;
if (dso == NULL) {
ret = DSO_new_method(meth);
if (ret == NULL) {
ERR_raise(ERR_LIB_DSO, ERR_R_DSO_LIB);
goto err;
}
allocated = 1;
/* Pass the provided flags to the new DSO object */
if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
ERR_raise(ERR_LIB_DSO, DSO_R_CTRL_FAILED);
goto err;
}
} else
ret = dso;
/* Don't load if we're currently already loaded */
if (ret->filename != NULL) {
ERR_raise(ERR_LIB_DSO, DSO_R_DSO_ALREADY_LOADED);
goto err;
}
/*
* filename can only be NULL if we were passed a dso that already has one
* set.
*/
if (filename != NULL)
if (!DSO_set_filename(ret, filename)) {
ERR_raise(ERR_LIB_DSO, DSO_R_SET_FILENAME_FAILED);
goto err;
}
filename = ret->filename;
if (filename == NULL) {
ERR_raise(ERR_LIB_DSO, DSO_R_NO_FILENAME);
goto err;
}
if (ret->meth->dso_load == NULL) {
ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
goto err;
}
if (!ret->meth->dso_load(ret)) {
ERR_raise(ERR_LIB_DSO, DSO_R_LOAD_FAILED);
goto err;
}
/* Load succeeded */
return ret;
err:
if (allocated)
DSO_free(ret);
return NULL;
}
DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
{
DSO_FUNC_TYPE ret = NULL;
if ((dso == NULL) || (symname == NULL)) {
ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (dso->meth->dso_bind_func == NULL) {
ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
return NULL;
}
if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
ERR_raise(ERR_LIB_DSO, DSO_R_SYM_FAILURE);
return NULL;
}
/* Success */
return ret;
}
/*
* I don't really like these *_ctrl functions very much to be perfectly
* honest. For one thing, I think I have to return a negative value for any
* error because possible DSO_ctrl() commands may return values such as
* "size"s that can legitimately be zero (making the standard
* "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
* times. I'd prefer "output" values to be passed by reference and the return
* value as success/failure like usual ... but we conform when we must... :-)
*/
long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
{
if (dso == NULL) {
ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
/*
* We should intercept certain generic commands and only pass control to
* the method-specific ctrl() function if it's something we don't handle.
*/
switch (cmd) {
case DSO_CTRL_GET_FLAGS:
return dso->flags;
case DSO_CTRL_SET_FLAGS:
dso->flags = (int)larg;
return 0;
case DSO_CTRL_OR_FLAGS:
dso->flags |= (int)larg;
return 0;
default:
break;
}
if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
return -1;
}
return dso->meth->dso_ctrl(dso, cmd, larg, parg);
}
const char *DSO_get_filename(DSO *dso)
{
if (dso == NULL) {
ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
return dso->filename;
}
int DSO_set_filename(DSO *dso, const char *filename)
{
char *copied;
if ((dso == NULL) || (filename == NULL)) {
ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (dso->loaded_filename) {
ERR_raise(ERR_LIB_DSO, DSO_R_DSO_ALREADY_LOADED);
return 0;
}
/* We'll duplicate filename */
copied = OPENSSL_strdup(filename);
if (copied == NULL)
return 0;
OPENSSL_free(dso->filename);
dso->filename = copied;
return 1;
}
char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
{
char *result = NULL;
if (dso == NULL || filespec1 == NULL) {
ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
if (dso->merger != NULL)
result = dso->merger(dso, filespec1, filespec2);
else if (dso
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