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

[Guy Harris <guy () alum mit edu>]

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.)
-
This is the tcpdump-workers list.
Visit https://cod.sandelman.ca/ to unsubscribe.