Hi Jakub,
On Wed, Jun 3, 2015 at 4:47 AM, Jakub Pawlowski <jpawlowski@xxxxxxxxxx> wrote:
> Currently, when BlueZ tries to connect to already paired device that
> just rotated its RPA MAC address, it would use old address and fail
> to connect. In order to fix that, "General Connection Establisment
> Procedure" must be used. It is already implemented in kernel.
>
> This patch changes connection procedure behaviour for paired devices.
> Instead of directly calling "connect" with last known RPA, it'll add
> device to kernel whitelist and start scan. If advertisement is received,
> it'll be compared against whitelist and then trigger connection if it
> matches.
>
> Two new filds were added to btd_device structure:
> paired_le_connect - if it's true, device was marked for autoconnect
> because someone tried to connect to it. When the connection is
> succesfully estabilished, or after timeout this field is cleared, and
> device is removed from autoconnect whitelist.
> paired_le_connect_timeout - keeps handle to timeout timer. If device
> is not found for 10 seconds, we cancel connection procedure.
> ---
> src/adapter.c | 2 ++
> src/device.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
> src/device.h | 2 ++
> 3 files changed, 70 insertions(+), 3 deletions(-)
>
> diff --git a/src/adapter.c b/src/adapter.c
> index 95b5349..7e6caba 100644
> --- a/src/adapter.c
> +++ b/src/adapter.c
> @@ -7465,6 +7465,8 @@ static void connected_callback(uint16_t index, uint16_t length,
> return;
> }
>
> + device_process_connect(device);
> +
> memset(&eir_data, 0, sizeof(eir_data));
> if (eir_len > 0)
> eir_parse(&eir_data, ev->eir, eir_len);
> diff --git a/src/device.c b/src/device.c
> index ce96ab5..8ec323c 100644
> --- a/src/device.c
> +++ b/src/device.c
> @@ -78,6 +78,7 @@
>
> #define IO_CAPABILITY_NOINPUTNOOUTPUT 0x03
>
> +#define PAIRED_LE_CONNECT_TIMEOUT 10
> #define DISCONNECT_TIMER 2
> #define DISCOVERY_TIMER 1
>
> @@ -255,6 +256,9 @@ struct btd_device {
> gboolean auto_connect;
> gboolean disable_auto_connect;
> gboolean general_connect;
> + gboolean paired_le_connect;
> +
> + guint paired_le_connect_timeout;
You probably don't need them both, you can use the timeout handle to
identify a connection is ongoing.
>
> bool legacy;
> int8_t rssi;
> @@ -1408,7 +1412,7 @@ void device_request_disconnect(struct btd_device *device, DBusMessage *msg)
> device);
> }
>
> -static void device_set_auto_connect(struct btd_device *device, gboolean enable)
> +void device_set_auto_connect(struct btd_device *device, gboolean enable)
> {
> char addr[18];
>
> @@ -4459,6 +4463,54 @@ static void att_error_cb(const GError *gerr, gpointer user_data)
> }
> }
>
> +void device_process_connect(struct btd_device *device)
> +{
> + if (!device->paired_le_connect)
> + return;
> +
> + device->paired_le_connect = FALSE;
> + g_source_remove(device->paired_le_connect_timeout);
Here you should probably set paired_le_connect_timeout to 0, just call
it le_connect_timeout, and you might need to remove it also when the
Disconnect is called or the device is removed/freed. Btw, there is
already a function to track connection called device_add_connection Im
not sure why you had to another one?
> + device_set_auto_connect(device, false);
> +
> + if (device->connect) {
> + g_dbus_send_message(dbus_conn,
> + dbus_message_new_method_return(device->connect));
> + dbus_message_unref(device->connect);
> + device->connect = NULL;
> + }
> +}
> +
> +static gboolean paired_le_connect_timeout(gpointer user_data)
> +{
> + struct btd_device *dev = user_data;
> + char addr[18];
> +
> + ba2str(&dev->bdaddr, addr);
> + DBG("Connection attempt to: %s was aborted after timeout", addr);
> +
> + if (dev->paired_le_connect == FALSE)
> + return FALSE;
> +
> + dev->paired_le_connect = false;
> + device_set_auto_connect(dev, false);
What happen is the device was already in the auto connect list? This
would disable it when in fact it should leave as it was.
> + if (!dev->connect)
> + return FALSE;
> +
> + if (dbus_message_is_method_call(dev->connect, DEVICE_INTERFACE,
> + "Connect")) {
> + DBG("returning response to %s",
> + dbus_message_get_sender(dev->connect));
> +
> + g_dbus_send_message(dbus_conn,
> + btd_error_failed(dev->connect, strerror(20)));
> + dbus_message_unref(dev->connect);
> + dev->connect = NULL;
> + }
> +
> + return FALSE;
> +}
> +
> int device_connect_le(struct btd_device *dev)
> {
> struct btd_adapter *adapter = dev->adapter;
> @@ -4466,16 +4518,27 @@ int device_connect_le(struct btd_device *dev)
> BtIOSecLevel sec_level;
> GIOChannel *io;
> GError *gerr = NULL;
> - char addr[18];
>
> /* There is one connection attempt going on */
> - if (dev->att_io)
> + if ((dev->le_state.paired && dev->paired_le_connect == true)
> + || dev->att_io)
> return -EALREADY;
>
> + char addr[18];
> ba2str(&dev->bdaddr, addr);
>
> DBG("Connection attempt to: %s", addr);
>
> + if (dev->le_state.paired) {
> + dev->paired_le_connect = true;
> + device_set_auto_connect(dev, true);
> + dev->paired_le_connect_timeout = g_timeout_add_seconds(
> + PAIRED_LE_CONNECT_TIMEOUT,
> + paired_le_connect_timeout,
> + dev);
> + return 0;
> + }
As I said you need to check if there device was already marked to auto
connect, if it wasn't then you add it and you have to remember to
remove it once connected or the connection times out. Also perhaps
this should only be done for devices using RPA since I think direct
connecting will probably be faster than passive scanning + connect.
> attcb = g_new0(struct att_callbacks, 1);
> attcb->err = att_error_cb;
> attcb->user_data = dev;
> diff --git a/src/device.h b/src/device.h
> index 1955f54..d6de1d6 100644
> --- a/src/device.h
> +++ b/src/device.h
> @@ -42,6 +42,8 @@ void device_update_addr(struct btd_device *device, const bdaddr_t *bdaddr,
> uint8_t bdaddr_type);
> void device_set_bredr_support(struct btd_device *device);
> void device_set_le_support(struct btd_device *device, uint8_t bdaddr_type);
> +void device_set_auto_connect(struct btd_device *device, gboolean enable);
> +void device_process_connect(struct btd_device *dev);
> void device_update_last_seen(struct btd_device *device, uint8_t bdaddr_type);
> void device_merge_duplicate(struct btd_device *dev, struct btd_device *dup);
> uint32_t btd_device_get_class(struct btd_device *device);
> --
> 2.2.0.rc0.207.ga3a616c
>
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--
Luiz Augusto von Dentz
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