NAP/GN with bluez-4

NAP/GN with bluez-4

[y.dmitry]

Hi!

Can't setup NAP-server with bluez-4 (versions 4.39, 4.47). Remote device
can't discover any services. But when i trying to run  'simple-service'
script from sources, i can see a "Serial Port" service on remote device.
Service disappears when script canceled. As I understand at this point,
all ok with connectivity and access rights.

I mean linux box must became an Access Point for phone, netbook, etc.

Logs:
...
bluetoothd[9949]: Loading builtin plugins
bluetoothd[9949]: Loading service plugin
bluetoothd[9949]: Loading hciops plugin
bluetoothd[9949]: Loading hal plugin
bluetoothd[9949]: Loading storage plugin
bluetoothd[9949]: Loading plugins /usr/lib/bluetooth/plugins
bluetoothd[9949]: Loading network plugin
bluetoothd[9949]: Loading serial plugin
...
bluetoothd[9949]: network_server_probe: path /org/bluez/9949/hci0
bluetoothd[9949]: Adding record with handle 0x10002
bluetoothd[9949]: Record pattern UUID 0000000f-0000-1000-8000-00805f9
bluetoothd[9949]: Record pattern UUID 00000100-0000-1000-8000-00805f9
bluetoothd[9949]: Record pattern UUID 00001002-0000-1000-8000-00805f9
bluetoothd[9949]: Record pattern UUID 00001116-0000-1000-8000-00805f9
bluetoothd[9949]: Changing service classes to 0x020104
bluetoothd[9949]: register_server_record: got record id 0x10002
bluetoothd[9949]: Registered interface org.bluez.NetworkRouter on path
/org/bluez/9949/hci0
h /org/bluez/9949/any
bluetoothd[9949]: Registered interface org.bluez.Service on path
/org/bluez/9949/any
bluetoothd[9949]: /etc/bluetooth/network.conf: Key file does not have
key 'Disable'
bluetoothd[9949]: Config options: InterfacePrefix=bnep0,
PANU_Script=(null), GN_Script=(null), NAP_Script=(null),
GN_Interface=pan1, NAP_Interface=pan2, Security=false
bluetoothd[9949]: bridge pan1 created
...
bluetoothd[9949]: network_server_probe: path /org/bluez/9949/hci0
bluetoothd[9949]: Adding record with handle 0x10002
bluetoothd[9949]: Record pattern UUID 0000000f-0000-1000-8000-00805f9
bluetoothd[9949]: Record pattern UUID 00000100-0000-1000-8000-00805f9
bluetoothd[9949]: Record pattern UUID 00001002-0000-1000-8000-00805f9
bluetoothd[9949]: Record pattern UUID 00001116-0000-1000-8000-00805f9
bluetoothd[9949]: Changing service classes to 0x020104
bluetoothd[9949]: register_server_record: got record id 0x10002
bluetoothd[9949]: Registered interface org.bluez.NetworkRouter on path
/org/bluez/9949/hci0

from dmesg:
[169632.490256] Bluetooth: Core ver 2.15
[169632.490308] Bluetooth: HCI device and connection manager initialized
[169632.490310] Bluetooth: HCI socket layer initialized
[169632.535120] Bluetooth: Generic Bluetooth USB driver ver 0.5
[170196.227526] Bluetooth: L2CAP ver 2.13
[170196.227529] Bluetooth: L2CAP socket layer initialized
[170196.262160] Bluetooth: SCO (Voice Link) ver 0.6
[170196.262163] Bluetooth: SCO socket layer initialized
[170196.290501] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[170196.290505] Bluetooth: BNEP filters: protocol multicast
[170196.440134] Bluetooth: RFCOMM socket layer initialized
[170196.440142] Bluetooth: RFCOMM TTY layer initialized
[170196.440145] Bluetooth: RFCOMM ver 1.11


# ifconfig -a|grep 'pan|bnep'
pan0      Link encap:Ethernet  HWaddr 3a:cb:41:e4:19:97

(pan0 iface not disappears when bluetoothd stops. But it's ok when i set
pan1 in config)


I can see both NAP/GN records with 'sdptool browse local'. After
'simple-service' script new record appears.
I dumped some bt traffic with 'hcidump' and saw a "serial port" record
transmission. It seems, that somewhy bluez completely ignores any
builtin records about network services.

I tried several userland tools (blueman, bluez-gnome) with no success.
bluez-gnome has no support for local services. blueman has such broken
support.

I tried to play a little with python and dbus (few 'simple-service'
script modifications). No success here too.

Am I missed something?

Re: NAP/GN with bluez-4

[Luiz Augusto von Dentz]

Hi,

On Wed, Aug 12, 2009 at 9:18 AM, y.dmitry@gmail.com<y.dmitry@gmail.com> wrote:
> Hi!
>
> Can't setup NAP-server with bluez-4 (versions 4.39, 4.47). Remote device
> can't discover any services. But when i trying to run  'simple-service'
> script from sources, i can see a "Serial Port" service on remote device.
> Service disappears when script canceled. As I understand at this point,
> all ok with connectivity and access rights.
>
> I mean linux box must became an Access Point for phone, netbook, etc.


The service registration is done by network plugin, you can edit
network.conf to configure which script/interface name to be used. Also
check if they are enabled by calling
org.bluez.NetworkRouter.GetProperties(), if not enabled enable it by
calling org.bluez.NetworkRouter.SetProperty("Enabled", True). Another
detail is that you should configure NAP bridge to be used since if you
follow the spec it needs to enable dhcp server and configure the
routes while GN is just a simple bridge.

Enabled is good for those applications that want to enable/disable
data tethering over bluetooth, so it can really be changed without
restarting bluetoothd.

-- 
Luiz Augusto von Dentz
Engenheiro de Computação

Re: NAP/GN with bluez-4

[Dmitry A. Yanko]

On Wed, Aug 12, 2009 at 3:59 PM, Luiz Augusto von
Dentz<luiz.dentz@gmail.com> wrote:
> The service registration is done by network plugin, you can edit
> network.conf to configure which script/interface name to be used. Also
All done here:
bluetoothd[10470]: Config options: InterfacePrefix=bnep0,
PANU_Script=(null), GN_Script=(null), NAP_Script=(null),
GN_Interface=pan1, NAP_Interface=pan2, Security=false
bluetoothd[10470]: bridge pan1 created
bluetoothd[10470]: HCI dev 0 registered
bluetoothd[10470]: child 10472 forked
bluetoothd[10470]: Entering main loop
bluetoothd[10470]: child 10472 exited
bluetoothd[10470]: HCI dev 0 up


> check if they are enabled by calling
> org.bluez.NetworkRouter.GetProperties(), if not enabled enable it by
> calling org.bluez.NetworkRouter.SetProperty("Enabled", True). Another
Values, extracted from dbus with python script:
...
router = dbus.Interface(bus.get_object("org.bluez", manager.DefaultAdapter()),
                "org.bluez.NetworkRouter")
...
print router.dbus_interface
props = router.GetProperties()
for pname in props.keys():
        print pname,props[pname]
...

Output:

org.bluez.NetworkRouter
Enabled 1
Name BlueZ NAP service
Uuid 00001116-0000-1000-8000-00805f9b34fb

org.bluez.NetworkHub
Enabled 1
Name BlueZ GN service
Uuid 00001117-0000-1000-8000-00805f9b34fb

org.bluez.NetworkPeer
Enabled 1
Name BlueZ PANU service
Uuid 00001115-0000-1000-8000-00805f9b34fb

All enabled.

> detail is that you should configure NAP bridge to be used since if you
> follow the spec it needs to enable dhcp server and configure the
> routes while GN is just a simple bridge.
I configured GN as pan1 and NAP as pan2. Only pan1 exists after
bluetoothd started (why I can't see pan2?).
# ifconfig pan1 inet 10.7.7.1 netmask 255.255.255.0 up
dhcp started on pan1

When I start discovery from my phone (or netbook) I can see in logs:
bluetoothd[11235]: adapter_get_device(00:0E:F6:01:00:98)
And with 'monitor-bluetooth' script:
{Device.PropertyChanged} [/org/bluez/11235/hci0/dev_00_0E_F6_01_00_98]
Connected = 1
{Device.PropertyChanged} [/org/bluez/11235/hci0/dev_00_0E_F6_01_00_98]
Connected = 0

hcidump shows me a lot of traffic, but no any records about NAP/GN in
a dump (as i understand, something similar to service xml record must
present. With 'simple-service' script there is SrvRecHndl about serial
service.). And, as result, no any services on 'bluez' blootooth device
shown.

BTW: 2.6.30-gentoo-r4
# zcat /proc/config.gz|grep CONFIG_BT
CONFIG_BT=m
CONFIG_BT_L2CAP=m
CONFIG_BT_SCO=m
CONFIG_BT_RFCOMM=m
CONFIG_BT_RFCOMM_TTY=y
CONFIG_BT_BNEP=m
CONFIG_BT_BNEP_MC_FILTER=y
CONFIG_BT_BNEP_PROTO_FILTER=y
CONFIG_BT_HIDP=m
CONFIG_BT_HCIBTUSB=m
CONFIG_BT_HCIUART=m
CONFIG_BT_HCIUART_H4=y
CONFIG_BT_HCIUART_BCSP=y
CONFIG_BT_HCIUART_LL=y
CONFIG_BT_HCIBCM203X=m
CONFIG_BT_HCIBPA10X=m
CONFIG_BT_HCIBFUSB=m
CONFIG_BT_HCIVHCI=m
# lsmod
Module                  Size  Used by
rfcomm                 36196  0
bridge                 47816  0
bnep                   11732  2
sco                     9912  0
l2cap                  22708  8 rfcomm,bnep
btusb                  11592  2
bluetooth              54084  9 rfcomm,bnep,sco,l2cap,btusb
nvidia               7229892  26
fuse                   53136  2
r8169                  31896  0
e100                   31420  0
intel_agp              26172  0
pl2303                 16888  1
usbserial              29736  3 pl2303
processor              33864  0
i2c_i801                8420  0
thermal                12688  0
button                  5092  0


-- 
#include <regards.h>

Re: NAP/GN with bluez-4

[Luiz Augusto von Dentz]

HI,

On Wed, Aug 12, 2009 at 11:10 AM, Dmitry A. Yanko<y.dmitry@gmail.com> wrote:
> router = dbus.Interface(bus.get_object("org.bluez", manager.DefaultAdapter()),
>                "org.bluez.NetworkRouter")
> ...
> print router.dbus_interface
> props = router.GetProperties()
> for pname in props.keys():
>        print pname,props[pname]
> ...

What does the command sdptool browse local gives to you? About the
pan2 you should create it yourself, as I explained before we don't
handle the routing/dhcp which is required for NAP, this can be the
problem here but in the other hand there is probably a bug since
enabled is set to true.

-- 
Luiz Augusto von Dentz
Engenheiro de Computação

Re: NAP/GN with bluez-4

[Dmitry A. Yanko]

On Thu, Aug 13, 2009 at 8:10 PM, Luiz Augusto von
Dentz<luiz.dentz@gmail.com> wrote:
> What does the command sdptool browse local gives to you? About the
> pan2 you should create it yourself, as I explained before we don't
> handle the routing/dhcp which is required for NAP, this can be the
> problem here but in the other hand there is probably a bug since
> enabled is set to true.
Look 'local.txt' file here: http://www.cross-road.org.ua/bttests/
hcidump output also available (with 'simple-service' script started,
when remote device can see 1 service, and without, when no services
shown at all). And also dump from windows box (NAP enabled), for
comparison.

-- 
#include <regards.h>

Re: NAP/GN with bluez-4

[Luiz Augusto von Dentz]

Hi,

On Fri, Aug 14, 2009 at 7:52 AM, Dmitry A. Yanko<y.dmitry@gmail.com> wrote:
> Look 'local.txt' file here: http://www.cross-road.org.ua/bttests/
> hcidump output also available (with 'simple-service' script started,
> when remote device can see 1 service, and without, when no services
> shown at all). And also dump from windows box (NAP enabled), for
> comparison.
>
> --
> #include <regards.h>
>

It seems the service is registered:

Service Name: BlueZ NAP service
Service Description: BlueZ PAN service
Service RecHandle: 0x10007
Service Class ID List:
  "Network Access Point" (0x1116)
Protocol Descriptor List:
  "L2CAP" (0x0100)
    PSM: 15
  "BNEP" (0x000f)
    Version: 0x0100
    SEQ16: 800 806
Language Base Attr List:
  code_ISO639: 0x656e
  encoding:    0x6a
  base_offset: 0x100
Profile Descriptor List:
  "Network Access Point" (0x1116)
    Version: 0x0100

The dump doesn't seems to contain it and I don't see any attempt to
retrieve it, so I'm staring to believe it is the remote device fault,
also this looks suspicious:

2009-08-12 13:33:29.014953 > ACL data: handle 1 flags 0x02 dlen 38
    L2CAP(d): cid 0x0040 len 34 [psm 1]
        SDP SSA Req: tid 0x0 len 0x1d
          pat uuid-128 0350278f-3dca-4e62-831d-a41165ff906c
          max 4088
          aid(s) 0x0000 - 0xffff
          cont 00
2009-08-12 13:33:29.015025 < ACL data: handle 1 flags 0x02 dlen 14
    L2CAP(d): cid 0x0305 len 10 [psm 1]
        SDP SSA Rsp: tid 0x0 len 0x5
          count 2
          cont 00

This is the only time it attempt to retrieve a record which doesn't
use bluetooth base, also note that there is no attempt to retrieve
0x1116 which would return NAP record so I don't think your device is
really capable to use NAP service or it depend on the record from
0350278f-3dca-4e62-831d-a41165ff906c.

-- 
Luiz Augusto von Dentz
Engenheiro de Computação