See the original file (in Unix troff format) from which this document was generated.
NAME
Xvnc - an X server providing VNC connectivity
SYNOPSIS
- Xvnc
-
[:display]
[-geometry widthxheight] [-depth depth]
[-pixelformat rgbNNN|bgrNNN] [-udpinputport port]
[-rfbport port] [-rfbwait time] [-nocursor]
[-rfbauth passwd-file] [-httpd dir]
[-httpport port] [-deferupdate time]
[-economictranslate] [-lazytight] [-desktop name] [-alwaysshared]
[-nevershared] [-dontdisconnect] [-viewonly] [-localhost]
[-interface ipaddr] [-inetd] [-compatiblekbd]
[X-options...]
DESCRIPTION
Xvnc is a VNC (Virtual Network Computing) server. It acts like
an X server with a virtual display. The display can be seen by a VNC
viewer application, which may be running on a different machine: see
vncviewer(1). Xvnc is built inside the source code tree of
XFree86, and shares many options with it.
Normally, you don't need to start Xvnc manually; use the
vncserver(1) wrapper script instead. This script sets reasonable
defaults for Xvnc session, checks many error conditions etc.
Please read the BUGS section if you plan to use VNC on an
untrusted network.
OPTIONS
Xvnc supports many standard X server options and a number of
VNC-specific options. To see what standard X server options are
supported, please look at the Xvnc -help output and read
the Xserver(1) manual page for details on those options.
The VNC-specific options are as follows:
- -geometry widthxheight
-
Set desktop width and height.
- -depth depth
-
Set the colour depth of the visual to provide, in bits per pixel. Must
be a value between 8 and 32.
- -pixelformat rgbNNN|bgrNNN
-
Set colour format for pixels representation. The viewer can do the
conversion to any other pixel format, but it is faster if the depth
and pixel format of the server is the same as the equivalent values on
the viewer display.
- -udpinputport port
-
UDP port for keyboard/pointer data.
- -rfbport port
-
TCP port for RFB protocol. The RFB protocol is used for commnunication
between VNC server and clients.
- -rfbwait time
-
Maximum time, in milliseconds, to wait for an RFB client (VNC viewer).
- -nocursor
-
Don't put up a pointer cursor on the desktop.
- -rfbauth passwd-file
-
Use authentication on RFB protocol from the specified file. The
passwd-file can be created using the vncpasswd(1) utility.
- -httpd dir
-
Serve files via HTTP protocol from the specified directory. Normally,
Java viewer classes are stored in such directory.
- -httpport port
-
TCP port on which Xvnc should listen for incoming HTTP connections (to
allow access to the desktop from any Java-capable browser).
- -deferupdate time
-
Time in milliseconds, to defer screen updates (default 40). Deferring
updates helps to coalesce many small desktop changes into a few larger
updates thus saving network bandwidth.
- -economictranslate
-
Use less memory-hungry pixel format translation.
- -lazytight
-
Disable the "gradient" filter in Tight encoding (TightVNC-specific).
The "gradient" filter often helps to improve data compression ratios,
but may slow down the server performance. Please note that this filter
is never used when a client enables JPEG compression in the Tight
encoding.
- -desktop name
-
Set VNC desktop name ("x11" by default).
- -alwaysshared
-
Always treat new clients as shared, never disconnect existing client
on a new client connection.
- -nevershared
-
Never treat new clients as shared, do not allow several simultaneous
client connections.
- -dontdisconnect
-
Don't disconnect existing clients when a new non-shared connection
comes in, refuse new connection instead.
- -viewonly
-
Don't accept keboard and pointer events from clients. All clients will
be able to see the desktop but won't be able to control it.
- -localhost
-
Only allow loopback connections from localhost. This option is useful
in conjunction with SSH tunneling.
- -interface ipaddr
-
Listen for client connections only on the network interface with given
ipaddr.
- -inetd
-
Xvnc is launched by inetd. This option causes Xvnc to redirect
network input/output to stdin/stdout.
- -compatiblekbd
-
Set META and ALT keys to the same X modifier flag, as in the original
version of Xvnc by AT&T labs (TightVNC-specific).
BUGS
There are many security problems in current Xvnc implementation. It's
recommended to restrict network access to Xvnc servers from untrusted
network adresses. Probably, the best way to secure Xvnc server is to
allow only loopback connections from the server machine (the
-localhost option) and to use SSH tunneling for remote access
to the Xvnc server. For details on SSH tunneling, see
<URL:http://www.uk.research.att.com/vnc/sshvnc.html> .
SEE ALSO
vncserver(1), vncviewer(1), vncpasswd(1),
vncconnect(1), sshd(1)
AUTHORS
Original VNC was developed in AT&T Laboratories Cambridge. TightVNC
additions were implemented by Constantin Kaplinsky. Many other people
participated in development, testing and support.
Man page authors:
Marcus Brinkmann <Marcus.Brinkmann at ruhr-uni-bochum.de>,
Tim Waugh <twaugh at redhat.com>,
Constantin Kaplinsky <const at tightvnc.com>
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