Randolph Bentson wrote:
>
> On Fri, Sep 08, 2000 at 01:58:54AM -0400, M. Peck Dickens wrote:
> > Hi there,
> >
> > OK, I've recieved my Fujitsu 600c and it works great under SANE!. Now, I want to
> > create /dev/scanner and soft link it to /dev/sgd. My question is how do I do
> > this properly and then give /dev/scanner the correct permissions so I can
> > use SANE as joe user instead of as root and still have security in place?
>
> That's good news.
>
> You cannot use permissions on "/dev/scanner" to open access.
Not if it's a symbolic link. However you could use mknod
to make it point to the same device as /dev/sgd :
mknod /dev/scanner c 21 3
and then set the permissions on it. Hopefully this wouldn't
confuse SANE. Probably not a smart idea though.
> Provided you've got a stable hardware environment, i.e., one
> which doesn't have SCSI devices added and removed on a whim,
> you can add a group "sane_oper", add whomever you want to that
> group, "chmod 660 /dev/sgd" and "chgrp sane_oper /dev/sgd".
>
> At least that's what I do.
>
> If you have SCSI devices added and removed, the device used to
> access the scanner will change. You'll have to change which
> device has the appropriate permissions. I believe the device
> filesystem in 2.4 kernel will address this problem.
There is also a user space utility called scsidev that could be
useful in this regard (and it works on all versions of Linux). It
allows aliases such as /dev/scanner to be created pointing at the
(sg) device that matches a given set of parameters. For example,
if you knew that your scanner has scsi id=5 then the following
could be placed in the file /etc/scsi.alias :
id=5, devtype=generic, alias=scanner
See http://www.garloff.de/kurt/linux/scsidev
What I have described above is documented in its manpage.
Doug Gilbert
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