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Date:   Thu, 22 Jul 2021 15:23:19 +0800
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Subject: [Bluez PATCH v2 09/11] plugins/admin_policy: add AffectedByPolicy property
From:   Howard Chung <howardchung@google.com>
To:     linux-bluetooth@vger.kernel.org, luiz.dentz@gmail.com
Cc:     Yun-Hao Chung <howardchung@chromium.org>,
        Miao-chen Chou <mcchou@chromium.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

From: Yun-Hao Chung <howardchung@chromium.org>

This adds property to indicate if a device has any service that is being
blocked by admin policy.

Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
---
The following test steps were performed:
1. Set ServiceAllowList to []
2. Verify AffectedByPolicy of K830 is False
3. Set ServiceAllowList to
   ["1800"]
4. Verify AffectedByPolicy of K830 is False
5. Set ServiceAllowList to ["1800","1801","180A","180F","1812"]
6. Verify AffectedByPolicy of K830 is True

(no changes since v1)

 plugins/admin_policy.c | 74 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 72 insertions(+), 2 deletions(-)

diff --git a/plugins/admin_policy.c b/plugins/admin_policy.c
index 73d695ef976b..3ce72b56b529 100644
--- a/plugins/admin_policy.c
+++ b/plugins/admin_policy.c
@@ -47,6 +47,7 @@ static struct btd_admin_policy {
 struct device_data {
 	struct btd_device *device;
 	char *path;
+	bool affected;
 };
 
 static struct btd_admin_policy *admin_policy_new(struct btd_adapter *adapter)
@@ -140,6 +141,27 @@ static bool service_allowlist_set(struct btd_admin_policy *admin_policy,
 	return true;
 }
 
+static void update_device_affected(void *data, void *user_data)
+{
+	struct device_data *dev_data = data;
+	bool affected;
+
+	if (!dev_data) {
+		error("Unexpected NULL device_data when updating device");
+		return;
+	}
+
+	affected = !btd_device_all_services_allowed(dev_data->device);
+
+	if (affected == dev_data->affected)
+		return;
+
+	dev_data->affected = affected;
+
+	g_dbus_emit_property_changed(dbus_conn, dev_data->path,
+			ADMIN_POLICY_STATUS_INTERFACE, "AffectedByPolicy");
+}
+
 static DBusMessage *set_service_allowlist(DBusConnection *conn,
 					DBusMessage *msg, void *user_data)
 {
@@ -168,6 +190,8 @@ static DBusMessage *set_service_allowlist(DBusConnection *conn,
 					ADMIN_POLICY_STATUS_INTERFACE,
 					"ServiceAllowList");
 
+	queue_foreach(devices, update_device_affected, NULL);
+
 	return dbus_message_new_method_return(msg);
 }
 
@@ -240,6 +264,29 @@ static bool device_data_match_by_path(const void *a, const void *b)
 	return strcmp(data->path, b) == 0;
 }
 
+static gboolean property_get_affected_by_policy(
+					const GDBusPropertyTable *property,
+					DBusMessageIter *iter, void *user_data)
+{
+	struct device_data *data = user_data;
+	dbus_bool_t affected;
+
+	if (!data) {
+		error("Unexpected error: device_data is NULL");
+		return FALSE;
+	}
+
+	dbus_message_iter_append_basic(iter, DBUS_TYPE_BOOLEAN,
+							&data->affected);
+
+	return TRUE;
+}
+
+static const GDBusPropertyTable admin_policy_device_properties[] = {
+	{ "AffectedByPolicy", "b", property_get_affected_by_policy },
+	{ }
+};
+
 static void free_device_data(void *data)
 {
 	struct device_data *device_data = data;
@@ -275,11 +322,33 @@ static void add_device_data(struct btd_device *device)
 
 	data->device = device;
 	data->path = g_strdup(device_get_path(device));
+	data->affected = !btd_device_all_services_allowed(data->device);
+
+	if (!g_dbus_register_interface(dbus_conn, data->path,
+					ADMIN_POLICY_STATUS_INTERFACE,
+					NULL, NULL,
+					admin_policy_device_properties,
+					data, remove_device_data)) {
+		btd_error(btd_adapter_get_index(adapter),
+			"Admin Policy Status interface init failed on path %s",
+						device_get_path(device));
+		free_device_data(data);
+		return;
+	}
+
 	queue_push_tail(devices, data);
 
 	DBG("device_data for %s added", data->path);
 }
 
+static void unregister_device_data(void *data, void *user_data)
+{
+	struct device_data *dev_data = data;
+
+	g_dbus_unregister_interface(dbus_conn, dev_data->path,
+						ADMIN_POLICY_STATUS_INTERFACE);
+}
+
 static struct btd_device *find_device_by_proxy(GDBusProxy *proxy)
 {
 	const char *path = g_dbus_proxy_get_path(proxy);
@@ -323,7 +392,7 @@ static void object_removed_cb(GDBusProxy *proxy, void *user_data)
 	data = queue_find(devices, device_data_match_by_path, path);
 
 	if (data)
-		remove_device_data(data);
+		unregister_device_data(data, NULL);
 }
 
 static int admin_policy_adapter_probe(struct btd_adapter *adapter)
@@ -402,7 +471,8 @@ static void admin_policy_exit(void)
 	DBG("");
 
 	btd_unregister_adapter_driver(&admin_policy_driver);
-	queue_destroy(devices, free_device_data);
+	queue_foreach(devices, unregister_device_data, NULL);
+	queue_destroy(devices, g_free);
 
 	if (policy_data)
 		admin_policy_free(policy_data);
-- 
2.32.0.402.g57bb445576-goog