[sane-devel] PIXMA MP530: Unprivileged user can't
seeiSerialNumber, thus can
Robert Price
bobpricemail at hotmail.com
Wed Jan 31 20:42:57 CET 2007
Not sure if this will help you but it helped me with user problems seeing
the scanner. Try adding the user to the "scanner" group with the command
'usermod -G scanner,<ALL other groups user belongs to> <user>. There is a
man page for usermod.
>From: Karen Pease <meme at daughtersoftiresias.org>
>To: sane-devel at lists.alioth.debian.org
>Subject: Re: [sane-devel] PIXMA MP530: Unprivileged user can't
>seeiSerialNumber, thus can't get proper device name.
>Date: Wed, 31 Jan 2007 18:14:07 +0000
>
>Thanks for the response. As mentioned in the original post, all
>of /proc/bus/usb is wide open. All of the files in that directory have the
>same permissions. Specifically, the scanner (002/007) is:
>
>-rwxrwxrwx 1 root users 103 Jan 30 02:09 002/007
>
>Also, the directories are world-accessible:
>
>drwxrwxrwx 2 root root 0 Jan 29 23:45 002/
>
>and:
>
>drwxrwxrwx 4 root root 0 Jan 29 23:45 usb/
>
>If it's a permissions issue, it's not one that relates to /proc/bus/usb
>file
>permissions, as far as I can tell.
>
> - Karen
>
>On Wednesday 31 January 2007 05:50 pm, m. allan noah wrote:
> > what are the perms on the actual /proc/bus/usb/XXX/YYY file?
> >
> > allan
> >
> > On 1/30/07, Karen Pease <meme at daughtersoftiresias.org> wrote:
> > > Is it possible to have non-root users scan from the MP530? I've been
> > > spinning my gears just to get the scanner to work at all as root, and
> > > finally managed to only by installing the CVS version of the backend
>and
> > > fiddling around with it. However, I can't seem to get a common user
>to
> > > have access to the scanner.
> > >
> > > First, what root sees. Lets just do a test.
> > >
> > > [root at daughtersoftiresias sane-backends]# scanimage -L
> > > [sanei_debug] Setting debug level of pixma to 10.
> > > [pixma] pixma version 0.12.2
> > > device `v4l:/dev/video0' is a Noname BT848 video ( *** UNKNOWN/GENER
> > > virtual device
> > > device `pixma:04A91712_114A42' is a CANON Canon PIXMA MP530
> > > multi-function peripheral
> > > [root at daughtersoftiresias sane-backends]# scanimage -d
> > > pixma:04A91712_114A42 -n
> > > [sanei_debug] Setting debug level of pixma to 10.
> > > [pixma] pixma version 0.12.2
> > > [pixma] pixma_open(): Canon PIXMA MP530
> > > [pixma] pixma_close(): Canon PIXMA MP530
> > > [root at daughtersoftiresias sane-backends]#
> > >
> > > Success. Now, for a mere mortal (with the same SANE-related
> > > debug/experimental environmental variables):
> > >
> > > [meme at daughtersoftiresias ~]$ scanimage -L
> > > [sanei_debug] Setting debug level of pixma to 10.
> > > [pixma] pixma version 0.12.2
> > > device `v4l:/dev/video0' is a Noname BT848 video ( *** UNKNOWN/GENER
> > > virtual device
> > > device `pixma:04A91712' is a CANON Canon PIXMA MP530 multi-function
> > > peripheral [meme at daughtersoftiresias ~]$ scanimage -d pixma:04A91712
>-n
> > > [sanei_debug] Setting debug level of pixma to 10.
> > > [pixma] pixma version 0.12.2
> > > [pixma] pixma_open(): Canon PIXMA MP530
> > > [pixma] pixma_connect() failed EACCES
> > > [pixma] pixma_open() failed EACCES
> > > [pixma] pixma_close(): Canon PIXMA MP530
> > > scanimage: open of device pixma:04A91712 failed: Access to resource
>has
> > > been denied
> > > [meme at daughtersoftiresias ~]$ scanimage -d pixma:04A91712_114A42 -n
> > > [sanei_debug] Setting debug level of pixma to 10.
> > > [pixma] pixma version 0.12.2
> > > scanimage: open of device pixma:04A91712_114A42 failed: Invalid
>argument
> > > [meme at daughtersoftiresias ~]$
> > >
> > > The first thing to notice is that the regular user doesn't see the
>same
> > > device name as root from scanimage -L: they see a name that's missing
>the
> > > serial, thus an improperly formatted pixma device name, as far as I
>can
> > > tell. When I give that device, we get an "access denied", even though
> > > I've set my /proc/bus/usb wide open. When I try the proper name that
> > > root is given (but meme is not), I get an invalid argument -- the same
>as
> > > I'd get if I typed -d pixma:qwijibo or -d pixma:ThisIsNotAValidDevice.
> > >
> > > So, why does it omit the serial? Well, I think I've got that one
>figured
> > > out. From sane-find-scanner -v -v: First, as root:
> > >
> > > trying libusb:
> > >
> > > <device descriptor of 0x04a9/0x1712 at 002:007 (Canon MP530)>
> > > bLength 18
> > > bDescriptorType 1
> > > bcdUSB 2.00
> > > bDeviceClass 0
> > > bDeviceSubClass 0
> > > bDeviceProtocol 0
> > > bMaxPacketSize0 64
> > > idVendor 0x04A9
> > > idProduct 0x1712
> > > bcdDevice 1.05
> > > iManufacturer 1 (Canon)
> > > iProduct 2 (MP530)
> > > iSerialNumber 3 (114A42)
> > > bNumConfigurations 1
> > > <configuration 0>
> > > ...
> > >
> > > Now, as meme:
> > >
> > > trying libusb:
> > >
> > > <device descriptor of 0x04a9/0x1712 at 002:007>
> > > bLength 18
> > > bDescriptorType 1
> > > bcdUSB 2.00
> > > bDeviceClass 0
> > > bDeviceSubClass 0
> > > bDeviceProtocol 0
> > > bMaxPacketSize0 64
> > > idVendor 0x04A9
> > > idProduct 0x1712
> > > bcdDevice 1.05
> > > iManufacturer 1 ((null))
> > > iProduct 2 ((null))
> > > iSerialNumber 3 ((null))
> > > bNumConfigurations 1
> > > <configuration 0>
> > >
> > > Meme seems unable to get iSerialNumber -- but it can get idVendor and
> > > idProduct, and thus ultimately determine what kind of scanner we're
> > > dealing with. The same thing happens with lsusb -v; root can see the
> > > serial number, while meme can't.
> > >
> > > Does this look like what's causing the problem to you? Can you think
>of
> > > a way to work around it? My ultimate goal is to be able to have users
> > > just start up gimp and be able to scan, but as it stands, that's not
>an
> > > option. Which is a shame, because I specifically picked the MP530
> > > because all of its features were reported as working well in Linux.
> > >
> > > Thanks!
> > >
> > > - Karen
> > >
> > >
> > > --
> > > sane-devel mailing list: sane-devel at lists.alioth.debian.org
> > > http://lists.alioth.debian.org/mailman/listinfo/sane-devel
> > > Unsubscribe: Send mail with subject "unsubscribe your_password"
> > > to sane-devel-request at lists.alioth.debian.org
> >
> > --
> > "The truth is an offense, but not a sin"
>
>
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