Re: pcap_findalldevs doesn't return bluetooth interfaces known to hcitool

["Barry Reinhold" <bbr () lampreynetworks com>]

Guy, Paolo:

I just want to confirm that installing the bluez-libs-devel-3.7-1.i386 rpm
(built on Fedora 6) worked on CentOS 5 and resolved the problem.

I should have caught the clue in config.log - that was an explicit message
that had the needed information, however, I appreciate the help.

Barry

-----Original Message-----
From: tcpdump-workers-owner () lists tcpdump org
[mailto:tcpdump-workers-owner () lists tcpdump org] On Behalf Of Guy Harris
Sent: Wednesday, November 14, 2007 9:02 PM
To: tcpdump-workers () lists tcpdump org
Subject: Re: [tcpdump-workers] pcap_findalldevs doesn't return bluetooth
interfaces known to hcitool


On Nov 14, 2007, at 10:57 AM, Barry Reinhold wrote:

> I am attempting to use libpcap to capture Bluetooth exchanges
> (DLT_BLUETOOTH)

Presumably you mean DLT_BLUETOOTH_HCI_H4 or  
DLT_BLUETOOTH_HCI_H4_WITH_PHDR; there is no DLT_BLUETOOTH with that  
name.

> and am working with the head of the cvs repository.
>
> The environment is a CentOS 5 system with kernel  2.6.18. It has a USB
> Bluetooth adaptor that shows up as hci0 when the "hcitool dev"  
> command is
> given. However, this interface, hci0, is not returned by  
> pcap_findalldevs -
> is it expected to be returned by pcap_findalldevs or are there other
> requirements outside of being visible to hcitool before the  
> interface will
> be seen by pcap?

The code that looks for Bluetooth adapters is bt_platform_finddevs()  
in pcap-bt-linux.c; that code is compiled in if PCAP_SUPPORT_BT is  
defined in config.h.

config.h is constructed by the configure script; the configure script  
will set it if you're on Linux (which you are) and if there's a "/usr/ 
include/bluetooth/bluetooth.h" header.  If that header isn't found,  
the configure script will not halt, but it will print the message

        Bluetooth sniffing is not supported; install bluez-lib devel to  
enable it

Do you have a developer package for the Bluez Bluetooth stack's  
library?  (No, I don't know what package that would be.)
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