Bluetooth: pand: Connection failed. File exists(17)

Bluetooth: pand: Connection failed. File exists(17)

[Geoff Shang]

Hi everyone,

I'm posting here in case someone has any ideas on how I can solve this 
mystery.  I've posted this to the bluez-users list without any response, so 
I'm also posting here in case someone has any ideas.

I'm trying to set up a network connection via bluetooth using pand and I've hit 
a problem that I can't find any references to.

I start pand on the NAP side with no problems, using the following comand:

pand --listen --role NAP

When I try to connect from the panu, I get the following:

Mar 10 18:35:46 data pand[16077]: Connection failed. File exists(17)

I get the same sort of thing on the other end.  Here's an example from when I 
tried reversing roles:

Mar 10 18:59:34 data pand[16186]: Bluetooth PAN daemon version 2.25
Mar 10 18:59:34 data pand[16186]: Connecting to 00:02:72:B2:A0:6E
Mar 10 18:59:34 data pand[16186]: Connect to 00:02:72:B2:A0:6E failed. File 
exists(17)

I've searched the web, read all relevant docs I could find, even took a look at 
the pand source.  I got as far as looking at bnep_accept_connection but then my 
brain began to ache (I'm not a C programmer).

I'm using bluez libs and utils v2.25 on both ends.  They were compiled with 
./configure --enable-all though some of the supporting components like obex 
weren't available.  One end is running on a freshly installed Debian 3.1 
system, the other is on a Debian 2.2 system with various upgrades; however all 
bluez items were compiled from source.

If anyone knows what this is, or even simply has suggestions as to what file it 
is that pand is complaining about, I'd be extremely greatful.

Geoff.


-- 
Geoff Shang <geoff@hitsandpieces.net>
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MSN: geoff@acbradio.org

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Re: Bluetooth: pand: Connection failed. File exists(17)

[Samuel Thibault]

Hi,

Maybe you should try running pand by hand through strace, and look for
lines containing EEXIST.

Regards,
Samuel

mldonkey don't work

[coscell]

I couldn't connect any servers within mldonkey recently.
Woud any one help me?

Re: mldonkey don't work

[Tony Baechler]

Have you made sure that the necessary ports are open?  I had a 
similar problem until I allowed the necessary ports.  Also what 
client are you using?  The ed2k or edonkey servers are not clients 
and probably won't work.

At 03:37 AM 3/18/2006, you wrote:
>I couldn't connect any servers within mldonkey recently.
>Woud any one help me?

Re: [H-GEN] Bluetooth: pand: Connection failed. File exists(17)

[Geoff Shang]

Geoff Shang wrote:

> Mar 10 18:35:46 data pand[16077]: Connection failed. File exists(17)

Thanks to those who helpfully suggested I run pand under strace. 
Unfortunately, for me at least, the results weren't particularly 
illuminating.

I'm assuming the following line from the panu side is significant:

ioctl(3, 0x400442c8, 0xbffff210)        = -1 EEXIST (File exists)

Anyone know what this means?

If it matters, ifconfig seems to show bnep0 as already existing, but not 
configured.  Should it go away when pand isn't running, and if so, how can 
I make it go away (i.e. would this be causing my problem?)

I'll send anyone interested in helping a copy of the entire strace output 
if they want it, but I don't want to bore three lists with it.

Any help appreciated.

Geoff.

Re: [H-GEN] Bluetooth: pand: Connection failed. File exists(17)

[Samuel Thibault]

Hi,

Geoff Shang, le Wed 22 Mar 2006 00:05:11 +1000, a écrit :
> Geoff Shang wrote:
> 
> >Mar 10 18:35:46 data pand[16077]: Connection failed. File exists(17)
> 
> Thanks to those who helpfully suggested I run pand under strace. 
> Unfortunately, for me at least, the results weren't particularly 
> illuminating.
> 
> I'm assuming the following line from the panu side is significant:
> 
> ioctl(3, 0x400442c8, 0xbffff210)        = -1 EEXIST (File exists)
> 
> Anyone know what this means?

Ah, strace was not updated for bluez ioctls.

By digging in the source code, it seems to come from bnep_connadd():

        strcpy(req.device, dev);
        req.sock = sk;
        req.role = role;

        if (ioctl(ctl, bnepconnadd, &req))

Reading from the kernel code, it seems to mean that a session already
exists for the given destination.

Regards,
Samuel

Solved (was Re: Bluetooth: pand: Connection failed. File exists(17))

[Geoff Shang]

Geoff Shang wrote:

> When I try to connect from the panu, I get the following:
>
> Mar 10 18:35:46 data pand[16077]: Connection failed. File exists(17)

This was a case of brain failure on my part.  I failed to understand that 
pand merely instructs the kernel and the hardware, rather than actually 
maintain the connections.  This is unlike PPPd, for example.  So a PAN 
connection will remain even if PANd is shut down.

The reason why I was getting the error is that I was trying to create a 
connection that already existed.  I was able to verify this with "pand -l".

I admit that the somewhat unhelpful error message had me chasing red 
herrings for awhile.

Thanks to those of you who, through your suggestions, nudged me in the 
right direction.

Geoff.