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[Qemu-devel] [Bug 925405] Re: VNC server does not work with Mac Screen S
From: |
Dave Eckhardt |
Subject: |
[Qemu-devel] [Bug 925405] Re: VNC server does not work with Mac Screen Sharing |
Date: |
Thu, 29 Dec 2016 07:53:22 -0000 |
FWIW, this affects me too.
Ubuntu 14.04
QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.30), Copyright (c)
2003-2008 Fabrice Bellard
OS X 10.9.5.
The observed behavior is that when I hit "Connect" a spinning circle
appears nearby but nothing else ever happens.
There are reports online:
https://www.reddit.com/r/homelab/comments/4jr893/qemu_with_vnc_to_osx_screen_sharing/
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https://bugs.launchpad.net/bugs/925405
Title:
VNC server does not work with Mac Screen Sharing
Status in QEMU:
New
Status in Ubuntu:
Invalid
Bug description:
When connecting to a QEMU instance from a Mac using any VNC settings
on the QEMU CLI and any target arch (ARM, Intel, etc.), the connection
is attempted but the negotiation never finishes.
I've verified this when building QEMU from source (1.0 and HEAD) on
Ubuntu, Fedora and Debian or when using Ubuntu (Oneiric) and Debian
(Lenny) packages.
It does not matter whether I specify authentication (or anything else)
on QEMU's side, the behavior is always the same - I see the connection
being established using netstat and tcpdump, but QEMU does not seem to
send back any pixmap data after the connection setup.
Best guess as to why this happens is that the VNC negotiation on QEMU
does not like the protocol version and VNC encoding sent by the Mac's
built-in VNC client, or that its negotiation logic is subtly broken. I
appreciate that it's not meant to be a full VNC server, but it
prevents me from using it remotely until a stable Mac build is
feasible.
Background info:
Mac OS X includes a VNC client called Screen Sharing that you can
invoke in two different ways:
* At a terminal, by typing "open vnc://hostname:tcp_port"
* From any URI-enabled field (such as the Safari URI field), where you can
just type the URI as vnc://hostname:tcp_port
Please do not confuse the enhanced VNC protocol Apple Remote Desktop
uses with Screen Sharing - they are not mutually exclusive, but they
are not incompatible either, since what Apple does is to negotiate
extra pixmap encoding and authentication options - I use Screen
Sharing to access many VNC servers such as vnc4server, tightvncserver,
vino, etc. without any issues whatsoever, so the issue I'm reporting
is not an issue with Apple's implementation.
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