Re: [Libusb-win32-devel] Possibility of acquiring raw USB packets with Libusb-win32

[Xiaofan C. <xia...@gm...>]

On 9/22/07, Varuna De Silva <va...@gm...> wrote:
>
> I need to get raw USB packets with its protocol headers, these protocol
> packets we need to convert to a pcap format to be decode by WireShark.
>
> Is it possible with Libusb-win32 API to get these raw packets by sniffing
> the  USBus , or do we have to write a special kernel level filter for this.
>
> Please be kind enough to guide us.
>

I am not an USB expert but I guess that the answer is no
and you need a special filter driver.

Do the existing open source sniffers like SnoopyPro and
SniffUSB work for you? Both of them use a filter driver.
1. SnoopyPro:
http://sourceforge.net/projects/usbsnoop/
2. SniffUSB
http://benoit.papillault.free.fr/usbsnoop/doc.php.en
http://www.pcausa.com/Utilities/UsbSnoop/default.htm

For libusb-win32, you can capature the debug message
and I think you are asking more than that.

Three steps to capature the debug message.
* add usb_set_debug(255) to your code after the call of usb_init()
* download DebugView from microsoft.com
http://www.microsoft.com/technet/sysinternals/utilities/debugview.mspx
* run DebugView to capture the driver's an the DLL's debug messages
Example output:
http://forum.microchip.com/tm.aspx?m=270049&mpage=2

Regards,
Xiaofan