/*
* Free a functional reference to a engine type. This version is only used
* internally.
*/
int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
{
int to_return = 1;
/*
* Reduce the functional reference count here so if it's the terminating
* case, we can release the lock safely and call the finish() handler
* without risk of a race. We get a race if we leave the count until
* after and something else is calling "finish" at the same time -
* there's a chance that both threads will together take the count from 2
* to 0 without either calling finish().
*/
e->funct_ref--;
engine_ref_debug(e, 1, -1);
if ((e->funct_ref == 0) && e->finish) {
if (unlock_for_handlers)
CRYPTO_THREAD_unlock(global_engine_lock);
to_return = e->finish(e);
if (unlock_for_handlers)
CRYPTO_THREAD_write_lock(global_engine_lock);
if (!to_return)
return 0;
}
REF_ASSERT_ISNT(e->funct_ref < 0);
/* Release the structural reference too */
if (!engine_free_util(e, 0)) {
ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH, ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}
/* These static functions starting with a lower case "engine_" always
* take place when CRYPTO_LOCK_ENGINE has been locked up. */
static int engine_list_add(ENGINE *e)
{
int conflict = 0;
ENGINE *iterator = NULL;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
iterator = engine_list_head;
while(iterator && !conflict)
{
conflict = (strcmp(iterator->id, e->id) == 0);
iterator = iterator->next;
}
if(conflict)
{
ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
ENGINE_R_CONFLICTING_ENGINE_ID);
return 0;
}
if(engine_list_head == NULL)
{
/* We are adding to an empty list. */
if(engine_list_tail)
{
ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
ENGINE_R_INTERNAL_LIST_ERROR);
return 0;
}
engine_list_head = e;
e->prev = NULL;
/* The first time the list allocates, we should register the
* cleanup. */
engine_cleanup_add_last(engine_list_cleanup);
}
else
{
/* We are adding to the tail of an existing list. */
if((engine_list_tail == NULL) ||
(engine_list_tail->next != NULL))
{
ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
ENGINE_R_INTERNAL_LIST_ERROR);
return 0;
}
engine_list_tail->next = e;
e->prev = engine_list_tail;
}
/* Having the engine in the list assumes a structural
* reference. */
e->struct_ref++;
engine_ref_debug(e, 0, 1)
/* However it came to be, e is the last item in the list. */
engine_list_tail = e;
e->next = NULL;
return 1;
}
ENGINE *ENGINE_get_last(void)
{
ENGINE *ret;
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = engine_list_tail;
if (ret) {
ret->struct_ref++;
engine_ref_debug(ret, 0, 1);
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return ret;
}
/*
* Initialise a engine type for use (or up its functional reference count if
* it's already in use). This version is only used internally.
*/
int engine_unlocked_init(ENGINE *e)
{
int to_return = 1;
if ((e->funct_ref == 0) && e->init)
/*
* This is the first functional reference and the engine requires
* initialisation so we do it now.
*/
to_return = e->init(e);
if (to_return) {
/*
* OK, we return a functional reference which is also a structural
* reference.
*/
e->struct_ref++;
e->funct_ref++;
engine_ref_debug(e, 0, 1);
engine_ref_debug(e, 1, 1);
}
return to_return;
}
ENGINE *ENGINE_new(void)
{
ENGINE *ret;
ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
ENGINEerr(ENGINE_F_ENGINE_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->struct_ref = 1;
engine_ref_debug(ret, 0, 1);
CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ENGINE, ret, &ret->ex_data);
return ret;
}
ENGINE *ENGINE_new(void)
{
ENGINE *ret;
if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)
|| (ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
ENGINEerr(ENGINE_F_ENGINE_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->struct_ref = 1;
engine_ref_debug(ret, 0, 1);
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ENGINE, ret, &ret->ex_data)) {
OPENSSL_free(ret);
return NULL;
}
return ret;
}
ENGINE *ENGINE_get_prev(ENGINE *e)
{
ENGINE *ret = NULL;
if (e == NULL) {
ENGINEerr(ENGINE_F_ENGINE_GET_PREV, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = e->prev;
if (ret) {
/* Return a valid structural reference to the next ENGINE */
ret->struct_ref++;
engine_ref_debug(ret, 0, 1);
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
/* Release the structural reference to the previous ENGINE */
ENGINE_free(e);
return ret;
}
ENGINE *
ENGINE_new(void)
{
ENGINE *ret;
if (!OPENSSL_init_crypto(0, NULL))
return NULL;
ret = malloc(sizeof(ENGINE));
if (ret == NULL) {
ENGINEerror(ERR_R_MALLOC_FAILURE);
return NULL;
}
memset(ret, 0, sizeof(ENGINE));
ret->struct_ref = 1;
engine_ref_debug(ret, 0, 1)
CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ENGINE, ret, &ret->ex_data);
return ret;
}
ENGINE *ENGINE_by_id(const char *id)
{
ENGINE *iterator;
char *load_dir = NULL;
if (id == NULL) {
ENGINEerr(ENGINE_F_ENGINE_BY_ID, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
iterator = engine_list_head;
while (iterator && (strcmp(id, iterator->id) != 0))
iterator = iterator->next;
if (iterator != NULL) {
/*
* We need to return a structural reference. If this is an ENGINE
* type that returns copies, make a duplicate - otherwise increment
* the existing ENGINE's reference count.
*/
if (iterator->flags & ENGINE_FLAGS_BY_ID_COPY) {
ENGINE *cp = ENGINE_new();
if (cp == NULL)
iterator = NULL;
else {
engine_cpy(cp, iterator);
iterator = cp;
}
} else {
iterator->struct_ref++;
engine_ref_debug(iterator, 0, 1);
}
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
if (iterator != NULL)
return iterator;
/*
* Prevent infinite recursion if we're looking for the dynamic engine.
*/
if (strcmp(id, "dynamic")) {
# ifdef OPENSSL_SYS_VMS
if ((load_dir = getenv("OPENSSL_ENGINES")) == 0)
load_dir = "SSLROOT:[ENGINES]";
# else
if ((load_dir = getenv("OPENSSL_ENGINES")) == 0)
load_dir = ENGINESDIR;
# endif
iterator = ENGINE_by_id("dynamic");
if (!iterator || !ENGINE_ctrl_cmd_string(iterator, "ID", id, 0) ||
!ENGINE_ctrl_cmd_string(iterator, "DIR_LOAD", "2", 0) ||
!ENGINE_ctrl_cmd_string(iterator, "DIR_ADD",
load_dir, 0) ||
!ENGINE_ctrl_cmd_string(iterator, "LIST_ADD", "1", 0) ||
!ENGINE_ctrl_cmd_string(iterator, "LOAD", NULL, 0))
goto notfound;
return iterator;
}
notfound:
ENGINE_free(iterator);
ENGINEerr(ENGINE_F_ENGINE_BY_ID, ENGINE_R_NO_SUCH_ENGINE);
ERR_add_error_data(2, "id=", id);
return NULL;
/* EEK! Experimental code ends */
}
