[linux-dvb] Re: Getting IR-codes directly from DVB-S?

[Oliver Endriss <o.endriss@gmx.de>]

On Saturday 11 October 2003 16:50, Holger Waechtler wrote:
> Oliver Endriss wrote:
> > On Friday 03 October 2003 14:12, Holger Waechtler wrote:
> > 
> >>Oliver Endriss wrote:
> >>
> >>>On Friday 03 October 2003 12:25, Holger Waechtler wrote:
> >>>
> >>>>Oliver Endriss wrote:
> >>>>
> >>>>>On Thursday 02 October 2003 15:21, Rene Bartsch wrote:
> >>>>>
> >>>>>>as it's quite a work to generate a key-code map, I'd like to know if 
> >>>>>>it's possible to route/catch the raw IR-codes directly to/from the 
> >>>>>>input-device or a socket with the current DVB-driver.
> >>>>>
> >>>>>Currently, there is no such interface.
> >>>>>The driver forwards the (translated) key codes to the input driver.
> >>>>>
> >>>>>A keymap is required, because
> >>>>>- the protocol type must be specified
> >>>>>- the driver requires a keymap for the translation table
> >>>>
> >>>>as soon you know the protocol you can load a dummy keymap which 
> >>>>translates key events 1:1.
> >>>
> >>>That's exactly what I'm going to do now.
> >>>There are two protocols (rc5/rcmm) with two inversion inversion settings
> >>>(on/off), i.e. 4 different settings. So I prompt the user to hold down any
> >>>key while cycling through the 4 possibilities.
> >>
> >>:) sounds good.
> > 
> > Unfortunately, this works only if the application is running as *root*,
> > because permissions of /proc/av7110_ir are nailed to 0644.
> > They cannot be modified without patching the driver. :-(
> > 
> > IMHO, the application which has opened the dvb devices in r/w mode,
> > should be allowed to write to /proc/av7110_ir, too.
> > 
> > While it's not a big security hole, I don't like patching permissions
> > of av7110_ir to 0666. ;-)
> > 
> > How could this be solved in a clean way?
> > Are there any plans to change the keymap interface for API-4?
> 
> hmmm, not yet. But I have to admit that I don't have a good idea for a 
> security concept right now. Do you? Adding a special configure-interface 
> in v4 would have the same problem, any application would be able to 
> reconfigure the keymap.

The current implementation has a number of restrictions:
- Permissions of /proc/av7110_ir cannot be changed without recompiling
  the driver, i.e. chown/chmod do not work.
- Only one keymap can be loaded for all devices.

What about loading keymaps using the ioctl interface of the event
device? This would require a new evdev ioctl which could be passed to
the low-level input device driver (i.e. av7110_ir.c). This way access
control of the evdev driver could be used for the keymap interface, too.
(I don't know whether Vojtech would accept this.)

Oliver


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