Date: Sun, 14 Sep 2014 14:38:23 +0900 From: "Lundberg, Johannes" <johannes@brilliantservice.co.jp> To: Hans Petter Selasky <hps@selasky.org> Cc: "freebsd-usb@freebsd.org" <freebsd-usb@freebsd.org> Subject: Re: libusb and non-root access problem Message-ID: <CAASDrVmNZ8ejS-794iNU_GTxiw-t=7xXs=FteKcS5RumeW-iJQ@mail.gmail.com> In-Reply-To: <54144E00.4080100@selasky.org> References: <CAASDrVn4eQXG7z11OE3ydyZGMaq-9rjCZqyv655SkZ%2BgKffeUg@mail.gmail.com> <54144E00.4080100@selasky.org>
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Thanks Hans for prompt reply, as always.
I reverse engineered a driver by sniffing USB traffic. The first two things
this driver did was SET_CONFIG and SET_INTERFACE. My implementation worked
fine under Linux but stumbled onto this (permission) problem on FreeBSD.
However, it seems to work fine if I skip the SET_CONFIG and SET_INTERFACE
calls so I can use my driver as normal user.
Thanks!
On Sat, Sep 13, 2014 at 11:00 PM, Hans Petter Selasky <hps@selasky.org>
wrote:
> On 09/13/14 14:04, Lundberg, Johannes wrote:
>
>> Hi
>>
>> I tried now for hours but no luck with this.. I have a special usb devic=
e
>> to which I connect with libusb. Everything works find as root but I can
>> seem to be able to access with normal user no matter how I configure
>> devfs.
>>
>> I changed both conf and rules and even set myself as owner and group and
>> 777 permission to /dev/ugen* /dev/usb and /dev/usb/* but no luck...
>>
>> I can connect to the device and claim interface but then it fails at the
>> first libusb_control_transfer with error -4
>>
>> I have done this before without problems. I am running the newest
>> 11-CURRENT snapshot so could there be any bug that causes this or has
>> anything changed in configurations?
>>
>> Grateful for any advice...
>> --
>> Johannes Lundberg
>>
>>
> Hi,
>
> You only need to "chmod /dev/usb/X.Y.0" .
>
> Some control transfers are always restricted to root user:
>
> /*
> * Avoid requests that would damage the bus integrity:
> */
> if (((req->bmRequestType =3D=3D UT_WRITE_DEVICE) &&
> (req->bRequest =3D=3D UR_SET_ADDRESS)) ||
> ((req->bmRequestType =3D=3D UT_WRITE_DEVICE) &&
> (req->bRequest =3D=3D UR_SET_CONFIG)) ||
> ((req->bmRequestType =3D=3D UT_WRITE_INTERFACE) &&
> (req->bRequest =3D=3D UR_SET_INTERFACE))) {
> /*
> * These requests can be useful for testing USB drivers.
> */
> error =3D priv_check(curthread, PRIV_DRIVER);
> if (error) {
> return (error);
> }
> }
>
> You need to use their libusb counterpart to avoid problems!
>
> --HPS
>
--=20
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=81=AA=E3=81=84=E3=82=88=E3=81=86=E3=81=8A=E9=A1=98=E3=81=84=E7=94=B3=E3=81=
=97=E4=B8=8A=E3=81=92=E3=81=BE=E3=81=99=E3=80=82
---
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