[sane-devel] using parallel port scanner as ordinary user in
recent version of Fedora
andre at bwh.harvard.edu
Tue Jul 11 18:57:12 UTC 2006
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.
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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