Hello
I've got a question. Is there any restriction of accessing services
after passing the pairing procedure? I think about situation when both
devices are paired and I suppose that now there is no restriction of
use of any services like serial port or any other. So is there a
danger of overuse of these services (i.e. in mobile phones it is
possible to manage them seemlessly through serial port from PC)?
Thanks in advance
Godfryd
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Hi Pedro,
> I am having some trouble with the timeouts of connections under Bluetooth.
>
> My first concern is the initial connection timeout. I try to send a file
> to a mobile phone using OpenOBEX (I use the BtOBEX_TransportConnect()).
> If the owner of the mobile phone ignores the message that appears in the
> mobile's screen (asking him/her whether to accept the connection), after
> 30 seconds the connection fails with "Resource temporarily unavailable"
> (errno=11). How can I modify this 30 seconds?
you need to integrate a connect timeout (SABM timeout) into the RFCOMM
kernel code.
> I can control the page timeout issuing "hciconfig hci0 pageto 8192",
> that will limit the time for (correct me if I am wrong) completing the
> HCI connection to about 5 seconds. But my problem is at a higher level
> (RFCOMM), since the device is whithin range and the HCI connection is
> done correctly. Is there any specific command in the bluez API to change
> the overall connect() timeout? Or is this a Linux issue (something like
> setsockopt())?
The page timeout is only for the underlaying ACL links. The RFCOMM stuff
is not configurable at the moment.
> The other problem is with the call sdp_service_search_attr_req(). There
> is one mobile that I am testing, that does not always respond (I am
> trying to track down the reason). This call takes about 2 minutes to
> give up so, in the previous scenario, it means that other clients are
> waiting for two minutes, something unacceptable. Is there a way to
> reduce this 2 minutes timeout?
I have no idea. I need the phone to play with it.
Regards
Marcel
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Hi Marcel & everybody else,
I am having some trouble with the timeouts of connections under Bluetooth.
My first concern is the initial connection timeout. I try to send a file
to a mobile phone using OpenOBEX (I use the BtOBEX_TransportConnect()).
If the owner of the mobile phone ignores the message that appears in the
mobile's screen (asking him/her whether to accept the connection), after
30 seconds the connection fails with "Resource temporarily unavailable"
(errno=11). How can I modify this 30 seconds?
I can control the page timeout issuing "hciconfig hci0 pageto 8192",
that will limit the time for (correct me if I am wrong) completing the
HCI connection to about 5 seconds. But my problem is at a higher level
(RFCOMM), since the device is whithin range and the HCI connection is
done correctly. Is there any specific command in the bluez API to change
the overall connect() timeout? Or is this a Linux issue (something like
setsockopt())?
In other words, what I want is that if the user does not respond within
a few seconds (much less than 30 seconds), the connection times out. I
need that because I may have many clients waiting and I can only
establish a connection to one at a time and I do not want the other
clients to wait too long.
The other problem is with the call sdp_service_search_attr_req(). There
is one mobile that I am testing, that does not always respond (I am
trying to track down the reason). This call takes about 2 minutes to
give up so, in the previous scenario, it means that other clients are
waiting for two minutes, something unacceptable. Is there a way to
reduce this 2 minutes timeout?
Thanks & regards,
Pedro
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Hi Godfryd,
> > > I've got a question. Is there any restriction of accessing services
> > > after passing the pairing procedure? I think about situation when both
> > > devices are paired and I suppose that now there is no restriction of
> > > use of any services like serial port or any other. So is there a
> > > danger of overuse of these services (i.e. in mobile phones it is
> > > possible to manage them seemlessly through serial port from PC)?
> >
> > this depends on if the device implements a policy manager or not. If it
> > uses a simple trust model based on the link key and the device address
> > then there are no other restrictions.
>
> Is this "policy manager" specified somehow by Bluetooth SIG? Or is
> this just a good will of e.g. cell phone manufaturers? I could find
> anything but security modes (1,2,3) about access restrictions, but it
> isn't what I need.
read the Bluetooth security whitepaper.
Regards
Marcel
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On 29/04/05, Marcel Holtmann <[email protected]> wrote:
> Hi Godfryd,
>=20
> > I've got a question. Is there any restriction of accessing services
> > after passing the pairing procedure? I think about situation when both
> > devices are paired and I suppose that now there is no restriction of
> > use of any services like serial port or any other. So is there a
> > danger of overuse of these services (i.e. in mobile phones it is
> > possible to manage them seemlessly through serial port from PC)?
>=20
> this depends on if the device implements a policy manager or not. If it
> uses a simple trust model based on the link key and the device address
> then there are no other restrictions.
Is this "policy manager" specified somehow by Bluetooth SIG? Or is
this just a good will of e.g. cell phone manufaturers? I could find
anything but security modes (1,2,3) about access restrictions, but it
isn't what I need.
Godfryd
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Hi Godfryd,
> I've got a question. Is there any restriction of accessing services
> after passing the pairing procedure? I think about situation when both
> devices are paired and I suppose that now there is no restriction of
> use of any services like serial port or any other. So is there a
> danger of overuse of these services (i.e. in mobile phones it is
> possible to manage them seemlessly through serial port from PC)?
this depends on if the device implements a policy manager or not. If it
uses a simple trust model based on the link key and the device address
then there are no other restrictions.
Regards
Marcel
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