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Date:   Thu,  8 Jul 2021 14:23:11 +0800
In-Reply-To: <20210708062314.245754-1-howardchung@google.com>
Message-Id: <20210708142059.Bluez.v1.11.I517e5199ac8019b770c7ee8c92a294ec1c752748@changeid>
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Subject: [Bluez PATCH v1 11/14] plugins/admin_policy: add device state callback
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 registers a device state callback function. It will be used to
implement "AffectedByPolicy" property which indicates if there is any
service in a device that is being blocked by admin policy.

Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
---
The following test steps were performed:
1. start discovery using UI
2. verify device_data were added by checking system log
3. stop discovery
4. verify device_data were removed after a few seconds by checking
system log

 plugins/admin_policy.c | 87 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/plugins/admin_policy.c b/plugins/admin_policy.c
index c5ad31f761d9..852e79aaa07a 100644
--- a/plugins/admin_policy.c
+++ b/plugins/admin_policy.c
@@ -20,6 +20,7 @@
 
 #include "src/adapter.h"
 #include "src/dbus-common.h"
+#include "src/device.h"
 #include "src/error.h"
 #include "src/log.h"
 #include "src/plugin.h"
@@ -30,6 +31,8 @@
 #define ADMIN_POLICY_STATUS_INTERFACE	"org.bluez.AdminPolicyStatus1"
 
 static DBusConnection *dbus_conn;
+static struct queue *devices; /* List of struct device_data objects */
+static unsigned int device_cb_id;
 
 /* |policy_data| has the same life cycle as btd_adapter */
 static struct btd_admin_policy {
@@ -38,6 +41,11 @@ static struct btd_admin_policy {
 	struct queue *service_allowlist;
 } *policy_data = NULL;
 
+struct device_data {
+	struct btd_device *device;
+	char *path;
+};
+
 static struct btd_admin_policy *admin_policy_new(struct btd_adapter *adapter)
 {
 	struct btd_admin_policy *admin_policy = NULL;
@@ -245,6 +253,79 @@ static int admin_policy_adapter_probe(struct btd_adapter *adapter)
 	return 0;
 }
 
+static bool device_data_match(const void *a, const void *b)
+{
+	const struct device_data *data = a;
+	const struct btd_device *dev = b;
+
+	if (!data) {
+		error("Unexpected NULL device_data");
+		return false;
+	}
+
+	return data->device == dev;
+}
+
+static void free_device_data(struct device_data *data)
+{
+	g_free(data->path);
+	g_free(data);
+}
+
+static void remove_device_data(void *data)
+{
+	struct device_data *device_data = data;
+
+	DBG("device_data for %s removing", device_data->path);
+
+	queue_remove(devices, device_data);
+	free_device_data(device_data);
+}
+
+static void add_device_data(struct btd_device *device)
+{
+	struct btd_adapter *adapter = device_get_adapter(device);
+	struct device_data *data;
+
+	if (queue_find(devices, device_data_match, device))
+		return;
+
+	data = g_new0(struct device_data, 1);
+	if (!data) {
+		btd_error(btd_adapter_get_index(adapter),
+				"Failed to allocate memory for device_data");
+		return;
+	}
+
+	data->device = device;
+	data->path = g_strdup(device_get_path(device));
+	queue_push_tail(devices, data);
+
+	DBG("device_data for %s added", data->path);
+}
+
+static void admin_policy_device_state_cb(struct btd_device *device,
+					enum btd_device_state_t new_state,
+					void *user_data)
+{
+	struct device_data *data = NULL;
+
+	switch (new_state) {
+	case BTD_DEVICE_STATE_INITIALIZING:
+		warn("Unexpected new state %d", new_state);
+		return;
+	case BTD_DEVICE_STATE_AVAILABLE:
+		add_device_data(device);
+		break;
+	case BTD_DEVICE_STATE_REMOVING:
+		data = queue_find(devices, device_data_match, device);
+
+		if (data)
+			remove_device_data(data);
+		break;
+	}
+}
+
 static struct btd_adapter_driver admin_policy_driver = {
 	.name	= "admin_policy",
 	.probe	= admin_policy_adapter_probe,
@@ -256,6 +337,10 @@ static int admin_policy_init(void)
 	DBG("");
 
 	dbus_conn = btd_get_dbus_connection();
+	devices = queue_new();
+
+	device_cb_id = btd_device_add_state_cb(admin_policy_device_state_cb,
+									NULL);
 
 	return btd_register_adapter_driver(&admin_policy_driver);
 }
@@ -265,6 +350,8 @@ static void admin_policy_exit(void)
 	DBG("");
 
 	btd_unregister_adapter_driver(&admin_policy_driver);
+	queue_destroy(devices, free_device_data);
+	btd_device_remove_state_cb(device_cb_id);
 
 	if (policy_data)
 		admin_policy_free(policy_data);
-- 
2.32.0.93.g670b81a890-goog