On Mon, Nov 12, 2012 at 02:29:26PM +0100, Karel Zak wrote:
> On Mon, Nov 12, 2012 at 11:04:11AM +0100, Dr. Werner Fink wrote:
> > On Wed, Nov 07, 2012 at 05:58:59PM +0100, Karel Zak wrote:
> > >
> > > Hi Werner,
> > >
> > > agetty in get_logname() interprets '@' and '#' as a special chars
> > > (see man page or the code for more details).
> > >
> > > The problem is that we already have crazy users who want to use AD
> > > (access domain) usernames in format user@domain on serial line or
> > > console.
> > >
> > > Yeah, I know that char '@' is not between allowed username chars
> > > (POSIX 3.429), but do we really need to support the spacial
> > > interpretation of the @ and # chars?
> > >
> > > I think it's old confusing legacy. Objections?
> >
> > Hmmm ... AFAICR the '@' symbols can be used to set the kill character
> > and the '#' can be used to set the erase character. But for a virtual
> > console terminal those characters those are normally not used.
> >
> > Only connections at dialin as well connections over some serial lines
> > with hardware/software line routers/terminal servers between this could
> > be problem. On big irons such serial lines are used even in the present
> > days.
> >
> > Maybe it would be worth to introduce an further option to support
> > access domains in user names ... or the other way around to support
> > '@' and '#' as special characters used for software escapes on
> > oldish connection lines.
>
> I thought about something like:
>
> --erase-chars <string>
> --kill-chars <string>
>
> and if the string is empty then agetty is insensitive to the special
> chars. This should be a default for virtual console (or also for
> serial line?).
>
> vice versa
>
> agetty --erase-chars '#'
>
> enables the support for the char.
>
> IMHO this solution is easy to extend (you can use another chars) and
> provides full control of the feature (you can disable it at all).
Indeed this is a good solution ... but in the case of systemd and its
getty generator we may think about a /etc/agettytab with a similar
syntax scheme as the old /etc/inittab to be able to provide agetty
options based on the used tty line. Clearly this /etc/agettytab should
be parsed by agetty and options for the specified tty are found:
1:tty1:--noclear %p
2:tty2:%p
3:tty3:%p
4:tty4:%p
5:tty5:%p
6:tty6:%p
S0:ttyS0:--erase-chars # --kill-chars @ -mt 60 %p 9600,2400,1200
S1:ttyS0:-L 9600 %p 9600 vt102
... ??
Werner
--
"Having a smoking section in a restaurant is like having
a peeing section in a swimming pool." -- Edward Burr
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