[LightDM] Error connecting to X server via IPv6

[Patrick Monnerat]

Hi Robert,
Thank you for your reply.

Bug now reported at https://bugs.launchpad.net/lightdm/+bug/1575200

Patrick

On 04/26/2016 02:39 PM, Robert Ancell wrote:
> 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 
> <mailto: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
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>
>
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