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auth-chain: drop refcounting of NMAuthChain for simple flags

Browse source 
NMAuthChain is not really ref-counted, there is no need for that additional
complexity.

But it is graceful towards calling nm_auth_chain_destroy() from inside the
callback. The caller may do so.

But we don't need a "ref_count" to track that. Two flags suffice: one to
say whether destroy was called and one to indicate that we are in the
process of finishing (to delay deallocating the NMAuthChain struct).

We already had the "done" flag that we used to indicate that the chain
is finished. So, we just need one more flag instead.
This commit is contained in:
Thomas Haller 2019-05-02 10:33:53 +02:00
parent 15a530d0bd
commit aab06c7c4b
1 changed files with 51 additions and 37 deletions
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88
src/nm-auth-utils.c
View file

@ -41,9 +41,8 @@ struct NMAuthChain {
NMAuthChainResultFunc done_func;
gpointer user_data;
guint32 refcount;
bool done:1;
bool is_destroyed:1;
bool is_finishing:1;
};
typedef struct {
@ -55,6 +54,10 @@ typedef struct {
/*****************************************************************************/
static void _auth_chain_destroy (NMAuthChain *self);
/*****************************************************************************/
static void
_ASSERT_call (AuthCall *call)
{
@ -212,20 +215,6 @@ nm_auth_chain_get_subject (NMAuthChain *self)
/*****************************************************************************/
static gboolean
auth_chain_finish (NMAuthChain *self)
{
self->done = TRUE;
/* Ensure we stay alive across the callback */
nm_assert (self->refcount == 1);
self->refcount++;
self->done_func (self, NULL, self->context, self->user_data);
nm_assert (NM_IN_SET (self->refcount, 1, 2));
nm_auth_chain_destroy (self);
return FALSE;
}
static void
auth_call_complete (AuthCall *call)
{
@ -235,13 +224,19 @@ auth_call_complete (AuthCall *call)
self = call->chain;
nm_assert (!self->done);
nm_assert (!self->is_finishing);
auth_call_free (call);
if (c_list_is_empty (&self->auth_call_lst_head)) {
/* we are on an idle-handler or a clean call-stack (non-reentrant). */
auth_chain_finish (self);
nm_assert (!self->is_destroyed);
nm_assert (!self->is_finishing);
self->is_finishing = TRUE;
self->done_func (self, NULL, self->context, self->user_data);
nm_assert (self->is_finishing);
_auth_chain_destroy (self);
}
}
@ -282,13 +277,17 @@ nm_auth_chain_add_call (NMAuthChain *self,
g_return_if_fail (self);
g_return_if_fail (self->subject);
g_return_if_fail (!self->done);
g_return_if_fail (!self->is_finishing);
g_return_if_fail (!self->is_destroyed);
g_return_if_fail (permission && *permission);
g_return_if_fail (nm_auth_subject_is_unix_process (self->subject) || nm_auth_subject_is_internal (self->subject));
nm_assert ( nm_auth_subject_is_unix_process (self->subject)
|| nm_auth_subject_is_internal (self->subject));
call = g_slice_new0 (AuthCall);
call->chain = self;
call->permission = g_strdup (permission);
call = g_slice_new (AuthCall);
*call = (AuthCall) {
.chain = self,
.permission = g_strdup (permission),
};
c_list_link_tail (&self->auth_call_lst_head, &call->auth_call_lst);
call->call_id = nm_auth_manager_check_authorization (auth_manager,
self->subject,
@ -310,6 +309,7 @@ nm_auth_chain_new_context (GDBusMethodInvocation *context,
NMAuthChain *chain;
g_return_val_if_fail (context, NULL);
nm_assert (done_func);
subject = nm_auth_subject_new_unix_process_from_context (context);
if (!subject)
@ -333,15 +333,18 @@ nm_auth_chain_new_subject (NMAuthSubject *subject,
NMAuthChain *self;
g_return_val_if_fail (NM_IS_AUTH_SUBJECT (subject), NULL);
nm_assert (nm_auth_subject_is_unix_process (subject) || nm_auth_subject_is_internal (subject));
nm_assert ( nm_auth_subject_is_unix_process (subject)
|| nm_auth_subject_is_internal (subject));
nm_assert (done_func);
self = g_slice_new0 (NMAuthChain);
c_list_init (&self->auth_call_lst_head);
self->refcount = 1;
self->done_func = done_func;
self->user_data = user_data;
self->context = context ? g_object_ref (context) : NULL;
self->subject = g_object_ref (subject);
self = g_slice_new (NMAuthChain);
*self = (NMAuthChain) {
.done_func = done_func,
.user_data = user_data,
.context = nm_g_object_ref (context),
.subject = g_object_ref (subject),
.auth_call_lst_head = C_LIST_INIT (self->auth_call_lst_head),
};
return self;
}
@ -361,13 +364,23 @@ nm_auth_chain_new_subject (NMAuthSubject *subject,
void
nm_auth_chain_destroy (NMAuthChain *self)
{
AuthCall *call;
g_return_if_fail (self);
g_return_if_fail (NM_IN_SET (self->refcount, 1, 2));
g_return_if_fail (!self->is_destroyed);
if (--self->refcount > 0)
self->is_destroyed = TRUE;
if (self->is_finishing) {
/* we are called from inside the callback. Keep the instance alive for the moment. */
return;
}
_auth_chain_destroy (self);
}
static void
_auth_chain_destroy (NMAuthChain *self)
{
AuthCall *call;
nm_clear_g_object (&self->subject);
nm_clear_g_object (&self->context);
@ -395,7 +408,8 @@ nm_auth_is_subject_in_acl (NMConnection *connection,
g_return_val_if_fail (connection, FALSE);
g_return_val_if_fail (NM_IS_AUTH_SUBJECT (subject), FALSE);
g_return_val_if_fail (nm_auth_subject_is_internal (subject) || nm_auth_subject_is_unix_process (subject), FALSE);
nm_assert ( nm_auth_subject_is_internal (subject)
|| nm_auth_subject_is_unix_process (subject));
if (nm_auth_subject_is_internal (subject))
return TRUE;