[sane-devel] using parallel port scanner as ordinary user in
recent version of Fedora
m. allan noah
anoah at pfeiffer.edu
Tue Jul 11 19:03:06 UTC 2006
this is just a permissions problem? can you get the udev subsystem to set
the mode of the parport file to something more permissive?
On Tue, 11 Jul 2006, Andre Robatino wrote:
> Stéphane VOLTZ wrote:
>> Le mardi 11 juillet 2006 01:36, Andre Robatino a écrit :
>>> My father has a Umax Astra 2000P parallel port scanner. At present
>>> it's accessible only as root. Before the advent of udev, it was
>>> possible to access as an ordinary user by changing the permission of
>>> /dev/parport0 from 660 to 666. Since udev appeared in Fedora 2, another
>>> solution is needed. After reading sane man pages, we've done the
>>> 1) In /etc/sane.d/dll.conf, uncommented "umax_pp".
>>> 2) In /etc/sane.d/net.conf, uncommented "localhost".
>>> 3) In /etc/xinetd.d, created a file "sane-port" with the contents:
>>> # default: off
>>> # description: The sane server accepts requests
>>> # for network access to a local scanner via the
>>> # network.
>>> service sane-port
>>> port = 6566
>>> socket_type = stream
>>> wait = no
>>> user = root
>>> group = root
>>> server = /usr/sbin/saned
>>> This is copied from the template in the saned man page, with the user
>>> and group changed from saned to root, since user and group saned don't
>>> exist, and since running as root would allow direct hardware access. I
>>> didn't add "localhost" to /etc/sane.d/sane.conf since the saned man page
>>> says that connections from localhost are always permitted. The file
>>> /etc/services already contains the lines
>>> sane-port 6566/tcp # SANE Control Port
>>> sane-port 6566/udp # SANE Control Port
>>> Ordinary user access still doesn't work. What's wrong?
>> I haven't enough saned experience to tell you what might going on.
>> But I have the feeling the trouble oyu have with /dev/parport0 may just be
>> an issue with 'ppdev' kernel module autoloading. Can you send the
>> debug messages of 'scanimage -L' with the environment variables
>> SANE_DEBUG_UMAX_PP and SANE_DEBUG_UMAX_PP_LOW set to 255 ?
>> There will be traces of which device is used or not, and some informations
>> why they are used.
>> Regards, Stef
> I have a different scanner, and I tried "scanimage -L" with the
> corresponding debug variable, and there was no additional output. So I think
> that the Fedora software isn't compiled with debug support. My father is a
> naive user and I have to read each command over the phone, so I can't ask him
> to compile from source. However, we determined that after running "scanimage
> -L" or xsane as root, the ppdev and parport modules are loaded and stay
> loaded. But even then, it's still impossible to access the scanner as an
> ordinary user. Then we tried using the line "port 0x378" in umax_pp.conf,
> and in this case the scanner can't be accessed even as root, even though the
> scanner is definitely on /dev/parport0 (we were previously using "port
> /dev/parport0" which allows root access).
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