[sane-devel] using parallel port scanner as ordinary user in recent version of Fedora

[m. allan noah]

this is just a permissions problem? can you get the udev subsystem to set 
the mode of the parport file to something more permissive?

allan

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
>>> following:
>>> 
>>> 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?
>>> 
>> 
>> 	Hello,
>> 
>> 	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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