Re: [PATCH] enable sniff on USB ports on linux

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

abeni wrote:

> An USB pseudo header is prepended to the captured URB to give
> additional information on URB (type, sender, ecc.).

That pseudo-header is currently in a separate GPL'ed pcap-usb.h header:

	1) The rest of libpcap is licensed under the Berkeley license, with 
some of it under the four-clause Berkeley license, which isn't 
compatible with the GPL:

                http://www.gnu.org/licenses/license-list.html#GPLIncompatibleLicenses

	   I don't know what would be required to go to the 3-clause Berkeley 
license.

	2) Should we have separate header files for pseudo-headers defined by 
libpcap, or should we put them in pcap.h?

The licensing issue also applies to pcap-usb.c.

> I used linktype DLT_USER0 for usb devices, but I suppose that should
> be changed to something new/different.

Yes.  We should define DLT_USB in pcap-bpf.h.
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