Ubuntu Manpage: x0tigervncserver - TigerVNC Server for X displays

Provided by: tigervnc-scraping-server_1.7.0+dfsg-8ubuntu2_amd64

NAME

       x0tigervncserver - TigerVNC Server for X displays

SYNOPSIS

       x0tigervncserver [options]
       x0tigervncserver -version

DESCRIPTION

       x0tigervncserver  is  a  TigerVNC Server which makes any X display remotely accessible via
       VNC, TigerVNC or compatible viewers.   Unlike  Xvnc(1),  it  does  not  create  a  virtual
       display.   Instead,  it just shares an existing X server (typically, that one connected to
       the physical screen).

       XDamage will be used if the existing X server supports it. Otherwise x0tigervncserver will
       fall back to polling the screen for changes.

OPTIONS

       x0tigervncserver interprets the command line as a list of parameters with optional values.
       Running x0vncserver -h will show a list of all valid parameters with  short  descriptions.
       All parameters are optional, but normally you would have to use the PasswordFile parameter
       (see its description below).

       There are several forms of  specifying  parameters  in  the  command  line  (here  we  use
       `SomeParameter' as an example parameter name):

       -SomeParameter
              Enable  the  parameter, turn the feature on.  This form can be used with parameters
              that simply enable or disable some feature.

       -SomeParameter=0
              Disable the parameter, turn the feature off.

       -SomeParameter=value
              Assign the specified value to the parameter.  The leading dash can be  omitted,  or
              it can be doubled if desired (like in GNU-style long options).

       Parameter names are case-insensitive, their order in the command line can be arbitrary.

PARAMETERS

display
The X display name. If not specified, it defaults to the value of the DISPLAY
environment variable.

rfbport
TCP port to listen for incoming VNC connections (RFB protocol). The default port
is 5900.

Log Specifies which log output should be directed to which target logger, and the level
of output to log. Format is log:target:level. Default is *:stderr:30 (log
everything to stderr, set log level to 30). Log level should be a value between 0
and 100, higher levels produce more output.

HostsFile
This parameter allows one to specify a file name with IP access control rules. The
file should include one rule per line, and the rule format is one of the following:
+address/prefix (accept connections from the specified address group),
-address/prefix (reject connections) or ?address/prefix (query the local user).
The first rule matching the IP address determines the action to be performed.
Rules that include only an action sign (+, - or ?) will match any IP address.
Prefix is optional and is specified as a number of bits (e.g. /24). Default is to
accept connections from any IP address.

SecurityTypes
Specify which security scheme to use for incoming connections. Valid values are a
comma separated list of None, VncAuth, Plain, TLSNone, TLSVnc, TLSPlain, X509None,
X509Vnc and X509Plain. Default is VncAuth,TLSVnc.

rfbauth, PasswordFile
Password file for VNC authentication. There is no default, you should specify the
password file explicitly. Password file should be created with the vncpasswd(1)
utility.

Password
Obfuscated binary encoding of the password which clients must supply to access the
server. Using this parameter is insecure, use PasswordFile parameter instead.

PlainUsers
A comma separated list of user names that are allowed to authenticate via any of
the "Plain" security types (Plain, TLSPlain, etc.). Specify * to allow any user to
authenticate using this security type. Default is to deny all users.

pam_service, PAMService
PAM service name to use when authentication users using any of the "Plain" security
types. Default is vnc.

X509Cert
Path to a X509 certificate in PEM format to be used for all X509 based security
types (X509None, X509Vnc, etc.).

X509Key
Private key counter part to the certificate given in X509Cert. Must also be in PEM
format.

BlacklistThreshold
The number of unauthenticated connection attempts allowed from any individual host
before that host is black-listed. Default is 5.

BlacklistTimeout
The initial timeout applied when a host is first black-listed. The host cannot re-
attempt a connection until the timeout expires. Default is 10.

QueryConnect
Prompt the local user to accept or reject incoming connections. Default is off.

QueryConnectTimeout
Number of seconds to show the Accept Connection dialog before rejecting the
connection. Default is 10.

AlwaysShared
Always treat incoming connections as shared, regardless of the client-specified
setting. Default is off.

NeverShared
Never treat incoming connections as shared, regardless of the client-specified
setting. Default is off.

DisconnectClients
Disconnect existing clients if an incoming connection is non-shared. If combined
with NeverShared then new connections will be refused while there is a client
active. Default is on.

AcceptKeyEvents
Accept key press and release events from clients. Default is on.

AcceptPointerEvents
Accept pointer events from clients. Default is on.

RemapKeys
Comma-separated list of incoming keysyms to remap. Mappings are expressed as two
hex values, prefixed by 0x, and separated by -> (`dash' and `greater than'
characters).

Protocol3.3
Always use RFB protocol version 3.3 for backwards compatibility with badly-behaved
clients. Default is off.

Geometry
This option specifies the screen area that will be shown to VNC clients. The
format is widthxheight+xoffset+yoffset , where `+' signs can be replaced with `-'
signs to specify offsets from the right and/or from the bottom of the screen.
Offsets are optional, +0+0 is assumed by default (top left corner). If the
argument is empty, full screen is shown to VNC clients (this is the default).

MaxProcessorUsage
Maximum percentage of CPU time to be consumed when polling the screen. Default is
35.

PollingCycle
Milliseconds per one polling cycle. Actual interval may be dynamically adjusted to
satisfy MaxProcessorUsage setting. Default is 30.

DeferUpdate
x0tigervncserver uses a "deferred update" mechanism which enhances performance in
many cases. After any change to the framebuffer, x0tigervncserver waits for this
number of milliseconds (default 1) before sending an update to any waiting clients.
This means that more changes tend to get coalesced together in a single update.
Setting it to 0 results in the same behaviour as earlier versions of
x0tigervncserver, where the first change to the framebuffer causes an immediate
update to any waiting clients.

AlwaysSetDeferUpdateTimer
Keep delaying sending the screen update to the client(s) each time the screen is
updated. Otherwise the delay is from the first update. Default is off.

CompareFB
Perform pixel comparison on framebuffer to reduce unnecessary updates. Can be
either 0 (off), 1 (always) or 2 (auto). Default is 2.

UseSHM Use MIT-SHM extension if available. Using that extension accelerates reading the
screen. Default is on.

OverlayMode
Use overlay mode in IRIX or Solaris (does not have effect in other systems). This
enables system-specific access to complete full-color version of the screen (the
default X visual often provides 256 colors). Also, in overlay mode, x0vncserver
can show correct mouse cursor. Default is on.

ZlibLevel
Zlib compression level for ZRLE encoding (it does not affect Tight encoding).
Acceptable values are between 0 and 9. Default is to use the standard compression
level provided by the zlib(3) compression library.

ImprovedHextile
Use improved compression algorithm for Hextile encoding which achieves better
compression ratios by the cost of using slightly more CPU time. Default is on.

IdleTimeout
The number of seconds after which an idle VNC connection will be dropped (zero
means no timeout). Default is 0.

MaxDisconnectionTime
Terminate when no client has been connected for N seconds. Default is 0.

MaxConnectionTime
Terminate when a client has been connected for N seconds. Default is 0.

MaxIdleTime
Terminate after N seconds of user inactivity. Default is 0.

ClientWaitTimeMillis
The number of milliseconds to wait for a client which is no longer responding.
Default is 20000.

AcceptCutText
SendCutText
MaxCutText
Currently unused.

AUTHOR