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https://issues.apache.org/jira/browse/GUACAMOLE-1196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17907169#comment-17907169
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Nick Couchman commented on GUACAMOLE-1196:
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After several days of digging around in this, I really think the thing to do at
this point is just to flip the setting so that this has to be explicitly
enabled when a connection is set up, rather than assuming that the connection
will support it. libvncclient's support for this is badly broken - in addition
to its own SendExtDesktopSize() method being somewhat broken, it actually
doesn't have any way of detecting or determining whether the remote server
supports resizing or not. There is a function called SupportsClient2Server that
checks if a certain message type is supported; however, these flags are just
statically set in the libvncclient code based on someone's knowledge of what
various types of VNC servers support.
I still think there has to be a way to negotiate it, since tools like
"vncviewer" on my local system are able to automatically choose whether or not
to send the command, and they don't get disconnected by a cranky VNC server,
but I haven't figured out, from packet captures or perusing source code for
various tools how that is actually determined.
> Add auto resize to VNC sessions
> -------------------------------
>
> Key: GUACAMOLE-1196
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1196
> Project: Guacamole
> Issue Type: Improvement
> Components: Documentation, VNC
> Reporter: Markus Bonet
> Assignee: Nick Couchman
> Priority: Minor
> Fix For: 1.6.0
>
>
> As discussed on the mailing list:
> {quote}
> I'm running a TigerVNC session on the server where Guacamole is installed. If
> I connect with the TigerVNC viewer there is this nice feature that the remote
> desktop is automatically resized if the viewer window is resized, like this
> if offered with RDP already.
> Is there a configuration how to achieve this with a Guacamole session as well
> for my VNC connection?
> {quote}
> Historically, this could not be done without corresponding support within
> libvncclient. This should now be possible through handling the required
> message type ({{SetDesktopSize}}):
> {quote}
> Unfortunately my team had to come up with a home baked solution for this
> about 2 years ago. But it involved hacking up libvnc.
> BUT, I think it is feasible to submit a feature request for it because now
> libvnc recently tagged a new version that includes the message type that
> guacamole needs to do this:
> Tag: https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.13
> New message:
> https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#setdesktopsize
> {quote}
> See:
> [http://apache-guacamole-general-user-mailing-list.2363388.n4.nabble.com/Auto-resize-of-VNC-sessions-td9511.html]
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