Re: Hotplug, 1394, and security

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

Kurt Konolige wrote:
> The 1394 Trade Association puts out something called the "IIDC 
> 1394-based Camera Specification", which most folks just call the DCAM 
> spec.  You control the camera by reading and writing into its 1394 
> address space, which is structured according to this spec.  I think IEC 
> 61883 defines a wrapper structure of iso packets that hold video; 
> devices with uncompressed video typically don't use it.
> 
> At any rate, user space control over the camera hinges on writing to 
> /dev/raw1394, to set camera parameters.  I frequently have to change the 
>  default /dev/raw1394 access controls on new Linux systems, to enable 
> DCAM controls.  It would be a pain if this were restricted to root access.

If I understand Jody's proposal correctly, libraw could transparently 
try to send those requests through the extra 
/dev/bus/ieee1394/${bus}/${nodeID} devices if available. An udev helper 
should become aware of IIDC compliant units and adjust node permissions 
according to local policy, on the fly.
-- 
Stefan Richter
-===-=-=-= =-= =-=
http://arcgraph.de/sr/


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