auth-chain: track auth-chains in embedded CList

NMManager and NMSettings both may have multiple authorization requests
ongoing. They need to keep track of them, at the very least to be able
to cancel them on shutdown.

Since NMAuthChain is not ref-countable, it always has only one clear
user/owner. It makes little sense otherwise. Since most callers already
want to track their NMAuthChain instances, let NMAuthChain help with that.

Embed a "parent" CList field inside NMAuthChain. This avoids requiring
an additional GSList allocation to track the element. Also, it allows to
link and append an element without iterating the list.

This ties the caller and the NMAuthChain a bit tighter together (making them
less indepdendent). Generally that is not desirable. But here it seems the
logic (of tracking the NMAuthChain) is still trivial and well separated.
It's just that NMAuthChain instances now can be linked in a CList.

4 files changed, 66 insertions, 36 deletions

diff --git a/src/nm-auth-utils.c b/src/nm-auth-utils.c
index ab7c1887dd..7235cba1a8 100644
--- a/src/nm-auth-utils.c
+++ b/src/nm-auth-utils.c
@@ -30,6 +30,9 @@
 /*****************************************************************************/
 
 struct NMAuthChain {
+
+	CList parent_lst;
+
 	CList data_lst_head;
 
 	CList auth_call_lst_head;
@@ -46,6 +49,8 @@ struct NMAuthChain {
 	bool is_finishing:1;
 };
 
+G_STATIC_ASSERT (G_STRUCT_OFFSET (NMAuthChain, parent_lst) == 0);
+
 typedef struct {
 	CList auth_call_lst;
 	NMAuthChain *chain;
@@ -435,6 +440,7 @@ nm_auth_chain_new_subject (NMAuthSubject *subject,
 		.user_data          = user_data,
 		.context            = nm_g_object_ref (context),
 		.subject            = g_object_ref (subject),
+		.parent_lst         = C_LIST_INIT (self->parent_lst),
 		.data_lst_head      = C_LIST_INIT (self->data_lst_head),
 		.auth_call_lst_head = C_LIST_INIT (self->auth_call_lst_head),
 	};
@@ -479,6 +485,8 @@ _auth_chain_destroy (NMAuthChain *self)
 	AuthCall *call;
 	ChainData *chain_data;
 
+	c_list_unlink (&self->parent_lst);
+
 	nm_clear_g_object (&self->subject);
 	nm_clear_g_object (&self->context);
 
diff --git a/src/nm-auth-utils.h b/src/nm-auth-utils.h
index 3344f9ec4f..5201d26052 100644
--- a/src/nm-auth-utils.h
+++ b/src/nm-auth-utils.h
@@ -24,6 +24,8 @@
 
 #include "nm-auth-manager.h"
 
+/*****************************************************************************/
+
 typedef struct NMAuthChain NMAuthChain;
 
 typedef void (*NMAuthChainResultFunc) (NMAuthChain *chain,
@@ -65,6 +67,25 @@ void nm_auth_chain_destroy (NMAuthChain *chain);
 
 NMAuthSubject *nm_auth_chain_get_subject (NMAuthChain *self);
 
+/*****************************************************************************/
+
+struct CList;
+
+static inline NMAuthChain *
+nm_auth_chain_parent_lst_entry (struct CList *parent_lst_self)
+{
+	return (NMAuthChain *) ((void *) parent_lst_self);
+}
+
+static inline struct CList *
+nm_auth_chain_parent_lst_list (NMAuthChain *self)
+{
+	return (struct CList *) ((void *) self);
+}
+
+/*****************************************************************************/
+
+
 /* Caller must free returned error description */
 gboolean nm_auth_is_subject_in_acl (NMConnection *connection,
                                     NMAuthSubject *subect,
diff --git a/src/nm-manager.c b/src/nm-manager.c
index e4eff3b029..949361f427 100644
--- a/src/nm-manager.c
+++ b/src/nm-manager.c
@@ -185,7 +185,8 @@ typedef struct {
 
 	GHashTable *device_route_metrics;
 
-	GSList *auth_chains;
+	CList auth_lst_head;
+
 	GHashTable *sleep_devices;
 
 	/* Firmware dir monitor */
@@ -1142,7 +1143,7 @@ _reload_auth_cb (NMAuthChain *chain,
 
 	nm_assert (G_IS_DBUS_METHOD_INVOCATION (context));
 
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 	flags = GPOINTER_TO_UINT (nm_auth_chain_get_data (chain, "flags"));
 
 	subject = nm_auth_chain_get_subject (chain);
@@ -1212,7 +1213,7 @@ impl_manager_reload (NMDBusObject *obj,
 		return;
 	}
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "flags", GUINT_TO_POINTER (flags), NULL);
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_RELOAD, TRUE);
 }
@@ -2330,7 +2331,6 @@ device_auth_done_cb (NMAuthChain *chain,
                      gpointer user_data)
 {
 	NMManager *self = NM_MANAGER (user_data);
-	NMManagerPrivate *priv = NM_MANAGER_GET_PRIVATE (self);
 	gs_free_error GError *error = NULL;
 	NMAuthCallResult result;
 	NMDevice *device;
@@ -2340,7 +2340,7 @@ device_auth_done_cb (NMAuthChain *chain,
 
 	nm_assert (G_IS_DBUS_METHOD_INVOCATION (context));
 
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 
 	permission = nm_auth_chain_get_data (chain, "perm");
 	nm_assert (permission);
@@ -2414,7 +2414,7 @@ device_auth_request_cb (NMDevice *device,
 
 	permission_dup = g_strdup (permission);
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "device", g_object_ref (device), g_object_unref);
 	nm_auth_chain_set_data (chain, "callback", callback, NULL);
 	nm_auth_chain_set_data (chain, "user-data", user_data, NULL);
@@ -5608,7 +5608,6 @@ deactivate_net_auth_done_cb (NMAuthChain *chain,
                              gpointer user_data)
 {
 	NMManager *self = NM_MANAGER (user_data);
-	NMManagerPrivate *priv = NM_MANAGER_GET_PRIVATE (self);
 	GError *error = NULL;
 	NMAuthCallResult result;
 	NMActiveConnection *active;
@@ -5616,7 +5615,7 @@ deactivate_net_auth_done_cb (NMAuthChain *chain,
 
 	nm_assert (G_IS_DBUS_METHOD_INVOCATION (context));
 
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 
 	path = nm_auth_chain_get_data (chain, "path");
 	result = nm_auth_chain_get_result (chain, NM_AUTH_PERMISSION_NETWORK_CONTROL);
@@ -5711,7 +5710,7 @@ impl_manager_deactivate_connection (NMDBusObject *obj,
 		goto done;
 	}
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "path", g_strdup (active_path), g_free);
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_NETWORK_CONTROL, TRUE);
 
@@ -6032,14 +6031,13 @@ enable_net_done_cb (NMAuthChain *chain,
                     gpointer user_data)
 {
 	NMManager *self = NM_MANAGER (user_data);
-	NMManagerPrivate *priv = NM_MANAGER_GET_PRIVATE (self);
 	NMAuthCallResult result;
 	gboolean enable;
 	NMAuthSubject *subject;
 
 	nm_assert (G_IS_DBUS_METHOD_INVOCATION (context));
 
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 	enable = GPOINTER_TO_UINT (nm_auth_chain_get_data (chain, "enable"));
 	subject = nm_auth_chain_get_subject (chain);
 
@@ -6094,7 +6092,7 @@ impl_manager_enable (NMDBusObject *obj,
 		goto done;
 	}
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "enable", GUINT_TO_POINTER (enable), NULL);
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_ENABLE_DISABLE_NETWORK, TRUE);
 
@@ -6128,12 +6126,11 @@ get_permissions_done_cb (NMAuthChain *chain,
                          gpointer user_data)
 {
 	NMManager *self = NM_MANAGER (user_data);
-	NMManagerPrivate *priv = NM_MANAGER_GET_PRIVATE (self);
 	GVariantBuilder results;
 
 	nm_assert (G_IS_DBUS_METHOD_INVOCATION (context));
 
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 
 	g_variant_builder_init (&results, G_VARIANT_TYPE ("a{ss}"));
 
@@ -6180,7 +6177,7 @@ impl_manager_get_permissions (NMDBusObject *obj,
 		return;
 	}
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_ENABLE_DISABLE_NETWORK, FALSE);
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_SLEEP_WAKE, FALSE);
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_ENABLE_DISABLE_WIFI, FALSE);
@@ -6331,7 +6328,7 @@ check_connectivity_auth_done_cb (NMAuthChain *chain,
 	ConnectivityCheckData *data;
 	NMDevice *device;
 
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 
 	result = nm_auth_chain_get_result (chain, NM_AUTH_PERMISSION_NETWORK_CONTROL);
 
@@ -6397,7 +6394,7 @@ impl_manager_check_connectivity (NMDBusObject *obj,
 		return;
 	}
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_NETWORK_CONTROL, TRUE);
 }
 
@@ -6767,7 +6764,7 @@ _dbus_set_property_auth_cb (NMAuthChain *chain,
 
 	g_slice_free (DBusSetPropertyHandle, handle_data);
 
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 	result = nm_auth_chain_get_result (chain, property_info->writable.permission);
 
 	if (result != NM_AUTH_CALL_RESULT_YES) {
@@ -6847,7 +6844,7 @@ nm_manager_dbus_set_property_handle (NMDBusObject *obj,
 	handle_data->export_version_id = nm_dbus_object_get_export_version_id (obj);
 
 	chain = nm_auth_chain_new_subject (subject, invocation, _dbus_set_property_auth_cb, handle_data);
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_add_call_unsafe (chain, property_info->writable.permission, TRUE);
 	return;
 
@@ -6881,8 +6878,9 @@ checkpoint_auth_done_cb (NMAuthChain *chain,
                          gpointer user_data)
 {
 	NMManager *self = NM_MANAGER (user_data);
-	NMManagerPrivate *priv = NM_MANAGER_GET_PRIVATE (self);
-	char *op, *checkpoint_path = NULL, **devices;
+	char *op;
+	char *checkpoint_path = NULL;
+	char **devices;
 	NMCheckpoint *checkpoint;
 	NMAuthCallResult result;
 	guint32 timeout, flags;
@@ -6892,7 +6890,7 @@ checkpoint_auth_done_cb (NMAuthChain *chain,
 	guint32 add_timeout;
 
 	op = nm_auth_chain_get_data (chain, "audit-op");
-	priv->auth_chains = g_slist_remove (priv->auth_chains, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 	result = nm_auth_chain_get_result (chain, NM_AUTH_PERMISSION_CHECKPOINT_ROLLBACK);
 
 	if (NM_IN_STRSET (op, NM_AUDIT_OP_CHECKPOINT_DESTROY,
@@ -6971,7 +6969,7 @@ impl_manager_checkpoint_create (NMDBusObject *obj,
 
 	g_variant_get (parameters, "(^aouu)", &devices, &rollback_timeout, &flags);
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "audit-op", NM_AUDIT_OP_CHECKPOINT_CREATE, NULL);
 	nm_auth_chain_set_data (chain, "devices", devices, (GDestroyNotify) g_strfreev);
 	nm_auth_chain_set_data (chain, "flags",  GUINT_TO_POINTER (flags), NULL);
@@ -7004,7 +7002,7 @@ impl_manager_checkpoint_destroy (NMDBusObject *obj,
 
 	g_variant_get (parameters, "(&o)", &checkpoint_path);
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "audit-op", NM_AUDIT_OP_CHECKPOINT_DESTROY, NULL);
 	nm_auth_chain_set_data (chain, "checkpoint_path", g_strdup (checkpoint_path), g_free);
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_CHECKPOINT_ROLLBACK, TRUE);
@@ -7035,7 +7033,7 @@ impl_manager_checkpoint_rollback (NMDBusObject *obj,
 
 	g_variant_get (parameters, "(&o)", &checkpoint_path);
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "audit-op", NM_AUDIT_OP_CHECKPOINT_ROLLBACK, NULL);
 	nm_auth_chain_set_data (chain, "checkpoint_path", g_strdup (checkpoint_path), g_free);
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_CHECKPOINT_ROLLBACK, TRUE);
@@ -7067,7 +7065,7 @@ impl_manager_checkpoint_adjust_rollback_timeout (NMDBusObject *obj,
 
 	g_variant_get (parameters, "(&ou)", &checkpoint_path, &add_timeout);
 
-	priv->auth_chains = g_slist_append (priv->auth_chains, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_set_data (chain, "audit-op", NM_AUDIT_OP_CHECKPOINT_ADJUST_ROLLBACK_TIMEOUT, NULL);
 	nm_auth_chain_set_data (chain, "checkpoint_path", g_strdup (checkpoint_path), g_free);
 	nm_auth_chain_set_data (chain, "add_timeout", GUINT_TO_POINTER (add_timeout), NULL);
@@ -7358,6 +7356,7 @@ nm_manager_init (NMManager *self)
 	guint i;
 	GFile *file;
 
+	c_list_init (&priv->auth_lst_head);
 	c_list_init (&priv->link_cb_lst);
 	c_list_init (&priv->devices_lst_head);
 	c_list_init (&priv->active_connections_lst_head);
@@ -7622,8 +7621,8 @@ dispose (GObject *object)
 		g_slice_free (PlatformLinkCbData, data);
 	}
 
-	g_slist_free_full (priv->auth_chains, (GDestroyNotify) nm_auth_chain_destroy);
-	priv->auth_chains = NULL;
+	while ((iter = c_list_first (&priv->auth_lst_head)))
+		nm_auth_chain_destroy (nm_auth_chain_parent_lst_entry (iter));
 
 	nm_clear_g_source (&priv->devices_inited_id);
 
diff --git a/src/settings/nm-settings.c b/src/settings/nm-settings.c
index 18ec00f6dd..6a14e195c0 100644
--- a/src/settings/nm-settings.c
+++ b/src/settings/nm-settings.c
@@ -114,7 +114,7 @@ typedef struct {
 
 	NMConfig *config;
 
-	GSList *auths;
+	CList auth_lst_head;
 
 	GSList *plugins;
 
@@ -660,7 +660,6 @@ pk_add_cb (NMAuthChain *chain,
            gpointer user_data)
 {
 	NMSettings *self = NM_SETTINGS (user_data);
-	NMSettingsPrivate *priv = NM_SETTINGS_GET_PRIVATE (self);
 	NMAuthCallResult result;
 	gs_free_error GError *error = NULL;
 	NMConnection *connection = NULL;
@@ -673,7 +672,7 @@ pk_add_cb (NMAuthChain *chain,
 
 	nm_assert (G_IS_DBUS_METHOD_INVOCATION (context));
 
-	priv->auths = g_slist_remove (priv->auths, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 
 	perm = nm_auth_chain_get_data (chain, "perm");
 	nm_assert (perm);
@@ -811,7 +810,8 @@ nm_settings_add_connection_dbus (NMSettings *self,
 		goto done;
 	}
 
-	priv->auths = g_slist_append (priv->auths, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
+
 	nm_auth_chain_set_data (chain, "perm", (gpointer) perm, NULL);
 	nm_auth_chain_set_data (chain, "connection", g_object_ref (connection), g_object_unref);
 	nm_auth_chain_set_data (chain, "callback", callback, NULL);
@@ -1467,7 +1467,7 @@ pk_hostname_cb (NMAuthChain *chain,
 
 	nm_assert (G_IS_DBUS_METHOD_INVOCATION (context));
 
-	priv->auths = g_slist_remove (priv->auths, chain);
+	c_list_unlink (nm_auth_chain_parent_lst_list (chain));
 
 	result = nm_auth_chain_get_result (chain, NM_AUTH_PERMISSION_SETTINGS_MODIFY_HOSTNAME);
 
@@ -1526,7 +1526,7 @@ impl_settings_save_hostname (NMDBusObject *obj,
 		return;
 	}
 
-	priv->auths = g_slist_append (priv->auths, chain);
+	c_list_link_tail (&priv->auth_lst_head, nm_auth_chain_parent_lst_list (chain));
 	nm_auth_chain_add_call (chain, NM_AUTH_PERMISSION_SETTINGS_MODIFY_HOSTNAME, TRUE);
 	nm_auth_chain_set_data (chain, "hostname", g_strdup (hostname), g_free);
 }
@@ -1947,6 +1947,7 @@ nm_settings_init (NMSettings *self)
 {
 	NMSettingsPrivate *priv = NM_SETTINGS_GET_PRIVATE (self);
 
+	c_list_init (&priv->auth_lst_head);
 	c_list_init (&priv->connections_lst_head);
 
 	priv->agent_mgr = g_object_ref (nm_agent_manager_get ());
@@ -1964,11 +1965,12 @@ dispose (GObject *object)
 {
 	NMSettings *self = NM_SETTINGS (object);
 	NMSettingsPrivate *priv = NM_SETTINGS_GET_PRIVATE (self);
+	CList *iter;
 
 	g_clear_object (&priv->startup_complete_blocked_by);
 
-	g_slist_free_full (priv->auths, (GDestroyNotify) nm_auth_chain_destroy);
-	priv->auths = NULL;
+	while ((iter = c_list_first (&priv->auth_lst_head)))
+		nm_auth_chain_destroy (nm_auth_chain_parent_lst_entry (iter));
 
 	if (priv->hostname_manager) {
 		g_signal_handlers_disconnect_by_func (priv->hostname_manager,