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mirror of https://github.com/openssl/openssl.git synced 2024-12-15 06:01:37 +08:00
openssl/crypto/dso/dso_lib.c
KaoruToda 26a7d938c9 Remove parentheses of return.
Since return is inconsistent, I removed unnecessary parentheses and
unified them.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4541)
2017-10-18 16:05:06 +01:00

351 lines
9.2 KiB
C

/*
* Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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_locl.h"
#include "internal/refcount.h"
static DSO_METHOD *default_DSO_meth = NULL;
static DSO *DSO_new_method(DSO_METHOD *meth)
{
DSO *ret;
if (default_DSO_meth == NULL) {
/*
* We default to DSO_METH_openssl() which in turn defaults to
* stealing the "best available" method. Will fallback to
* DSO_METH_null() in the worst case.
*/
default_DSO_meth = DSO_METHOD_openssl();
}
ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->meth_data = sk_void_new_null();
if (ret->meth_data == NULL) {
/* sk_new doesn't generate any errors so we do */
DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
ret->meth = default_DSO_meth;
ret->references = 1;
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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, dso->lock) <= 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)) {
DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
return 0;
}
}
if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
return 0;
}
sk_void_free(dso->meth_data);
OPENSSL_free(dso->filename);
OPENSSL_free(dso->loaded_filename);
CRYPTO_THREAD_lock_free(dso->lock);
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) {
DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (CRYPTO_UP_REF(&dso->references, &i, dso->lock) <= 0)
return 0;
REF_PRINT_COUNT("DSO", r);
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) {
DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
goto err;
}
allocated = 1;
/* Pass the provided flags to the new DSO object */
if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
goto err;
}
} else
ret = dso;
/* Don't load if we're currently already loaded */
if (ret->filename != NULL) {
DSOerr(DSO_F_DSO_LOAD, 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)) {
DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
goto err;
}
filename = ret->filename;
if (filename == NULL) {
DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
goto err;
}
if (ret->meth->dso_load == NULL) {
DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
goto err;
}
if (!ret->meth->dso_load(ret)) {
DSOerr(DSO_F_DSO_LOAD, 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)) {
DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (dso->meth->dso_bind_func == NULL) {
DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
return NULL;
}
if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
DSOerr(DSO_F_DSO_BIND_FUNC, 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) {
DSOerr(DSO_F_DSO_CTRL, 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)) {
DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
return -1;
}
return dso->meth->dso_ctrl(dso, cmd, larg, parg);
}
const char *DSO_get_filename(DSO *dso)
{
if (dso == NULL) {
DSOerr(DSO_F_DSO_GET_FILENAME, 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)) {
DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (dso->loaded_filename) {
DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
return 0;
}
/* We'll duplicate filename */
copied = OPENSSL_strdup(filename);
if (copied == NULL) {
DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
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) {
DSOerr(DSO_F_DSO_MERGE, 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->meth->dso_merger != NULL)
result = dso->meth->dso_merger(dso, filespec1, filespec2);
}
return result;
}
char *DSO_convert_filename(DSO *dso, const char *filename)
{
char *result = NULL;
if (dso == NULL) {
DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (filename == NULL)
filename = dso->filename;
if (filename == NULL) {
DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
return NULL;
}
if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
if (dso->name_converter != NULL)
result = dso->name_converter(dso, filename);
else if (dso->meth->dso_name_converter != NULL)
result = dso->meth->dso_name_converter(dso, filename);
}
if (result == NULL) {
result = OPENSSL_strdup(filename);
if (result == NULL) {
DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
return NULL;
}
}
return result;
}
int DSO_pathbyaddr(void *addr, char *path, int sz)
{
DSO_METHOD *meth = default_DSO_meth;
if (meth == NULL)
meth = DSO_METHOD_openssl();
if (meth->pathbyaddr == NULL) {
DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED);
return -1;
}
return (*meth->pathbyaddr) (addr, path, sz);
}
DSO *DSO_dsobyaddr(void *addr, int flags)
{
DSO *ret = NULL;
char *filename = NULL;
int len = DSO_pathbyaddr(addr, NULL, 0);
if (len < 0)
return NULL;
filename = OPENSSL_malloc(len);
if (filename != NULL
&& DSO_pathbyaddr(addr, filename, len) == len)
ret = DSO_load(NULL, filename, NULL, flags);
OPENSSL_free(filename);
return ret;
}
void *DSO_global_lookup(const char *name)
{
DSO_METHOD *meth = default_DSO_meth;
if (meth == NULL)
meth = DSO_METHOD_openssl();
if (meth->globallookup == NULL) {
DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
return NULL;
}
return (*meth->globallookup) (name);
}