[LAU] Sniffing on MIDI to/from virtualbox

[Clemens Ladisch]

Atte wrote:
> On 08/08/2015 04:05 PM, Clemens Ladisch wrote:
>> Atte wrote:
>>> When I enable the device in virtualbox, it seems to disappear from the
>>> linux
>>
>> USB devices cannot be shared between host and VM.
>
> Ok. I was just hoping to "listen in" on the traffic. I imagined the bits
> must be running somewhere in my linux system, even though it show up in
> virtualbox.

Virtualbox knows about that data, but it has no interface for you to
access it.

>> Please show the output of "lsusb -v" for this device.
>
>       AudioControl Interface Descriptor:
>         baInterfaceNr( 0)       1
>     Interface Descriptor:
>       bInterfaceClass         1 Audio
>       bInterfaceSubClass      3 MIDI Streaming
>       bInterfaceProtocol      0

This is a plain MIDI device, and there is no other obvious mechanism to
access the device, so it is likely that the software uses MIDI for its
vendor-specific stuff.

Anyway, Virtualbox uses the Linux API to access the real USB controller,
so it should be possible to use usbmon:
https://www.kernel.org/doc/Documentation/usb/usbmon.txt

>     bmAttributes         0xa0
>       (Bus Powered)
>       Remote Wakeup
>     MaxPower              100mA
>     Interface Descriptor:
>       bInterfaceNumber        0

I guess this is from some other device?


Regards,
Clemens