[LightDM] Error connecting to X server via IPv6

[Robert Ancell]

Hi Patrick,

Thanks for this patch. Would you be able to open a bug on
https://launchpad.net/lightdm/ describing this? It makes it easier to track
the issue.

--Robert

On Fri, 8 Apr 2016 at 14:10 Patrick Monnerat <patrick.monnerat at dh.com>
wrote:

> Hi list,
>
> I've discovered a problem in lightdm XDMCP using link-local IPv6
> addresses without interface index to connect to X server.
> It has been originally reported at
> https://bugzilla.redhat.com/show_bug.cgi?id=1322775.
>
> The problem can be fixed by having the XDMCP client not transmitting
> link-local addresses in the request, but if it does, lightdm XDMCP
> server can be a lot smarter if the attached patch is applied.
>
> It changes the X server address selection order to set the lowest
> preference to link-local addresses, even if matching the source address
> or family.
>
> This is not 100% full-proof: if only link-local addresses have been
> received, one of them is used anyway. In this case, a complete solution
> would be to determine and set the address interface index if not ambiguous.
>
> However, this patch fixes the problem for most of the non-pathological
> cases.
>
> Regards,
> Patrick
> _______________________________________________
> LightDM mailing list
> LightDM at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/lightdm
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/lightdm/attachments/20160426/d42150f6/attachment.html>