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Re: [Qemu-devel] [PATCH] add VNC reverse connections

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] add VNC reverse connections
Date: Wed, 16 Jan 2008 18:04:53 -0600
User-agent: Thunderbird (X11/20071022)

Daniel P. Berrange wrote:
On Wed, Jan 16, 2008 at 07:09:03AM -0800, Eddie Kohler wrote:
Daniel P. Berrange wrote:
We already have the ability to pass multiple flags / options to the VNC
driver as a post-fix to the host:port pair, so I'm not a fan of introducing
a new option as a prefix. If using existing options syntax, it could look

 -vnc :5500,rev
 -vnc read.cs.ucla.edu:5500,rev
This doesn't feel like an option to me, though; rather a different means of connecting. Among other things, in "-vnc :0", the QEMU VNC server opens port 5900. But the client's listening port for reverse connections defaults to 5500. "-vnc :-400,rev" is clearly insane, but it seems strange for an option like ",rev" to change the meaning of the port field.

Yes that is a valid point. It is a little unfortunate we switched to using
display num instead of port num for the current VNC code. Having a syntax
which makes people use negative display nums for reverse connections would
suck. So reluctantly I think your original proposal may actually be better.

Yet this is the syntax we use for normal connections. I don't see why the asymmetry is okay for reverse connections.


Anthony Liguori


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