X2Go Bug report logs - #218
x2gobroker: Hostname is used instead of FQDN

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Package: x2gobroker; Maintainer for x2gobroker is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2gobroker is src:x2gobroker.

Reported by: Anders Bruun Olsen <abo@dsl.dk>

Date: Wed, 22 May 2013 13:33:02 UTC

Severity: normal

Tags: confirmed, pending

Found in version 0.0.2.2

Fixed in version 0.0.2.3

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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Subject: Bug#218: [X2Go-Dev] Bug#218: x2gobroker: Hostname is used instead of FQDN
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Date: Wed, 22 May 2013 17:53:35 +0200
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
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[Message part 1 (text/plain, inline)]
tag #218 confirmed
thanks

Hi Anders,

On Mi 22 Mai 2013 15:30:29 CEST Anders Bruun Olsen wrote:

> Package: x2gobroker
> Version: 0.0.2.2
>
> I am setting up a loadbalanced cluster of x2go servers with a broker in
> front. There are thinclients on the LAN accessing the broker/cluster and
> there will be users logging on from outside. Users on the LAN are served
> term1.example.lan and term2.example.lan, whereas users from outside get
> term1.example.com and term2.example.com. So far everything has worked fine,
> but now I have started testing outside access, which does not work.
> x2gobroker (with autologin) tells x2goclient to access term1 or term2 - it
> leaves out the rest of the domain name. This works fine on the LAN, because
> the machines there have example.lan set as their searchdomain, but machines
> from outside can't resolve "term1" to "term1.example.com" and need to be
> given the FQDN. Please note that the FQDNs is specified in the
> sessionprofiles, but x2goclient still tries to resolve the short version of
> the name.

A fix for this is not so trivial, as it seems. The ,,wrong'' hostname  
is produced by x2golistsession on the server that the x2gobroker-agent  
gets executed on.

Obviously, your external clients call the X2Go Session Broker. The  
session broker knows a list of possible hosts for sending the  
select_session query to. The server that gets asked responds with a  
hostname from the X2Go session DB, that is not necessarily what you  
configured in X2Go Session Broker's x2gobroker-sessionprofiles.conf.

So, what is needed is a backwards mapping between the result that gets  
returned by x2gobroker-agent (i.e. the returned server name /  
hostname) back to the FQDN hostnames configured in X2Go Session  
Broker. The mapping is not bijective here, it is more about guessing  
and shooting blindfolded.

/me scratches his head on the best approach for this...

Mike




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