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Архив рубрики: Vnc server timeout setting

Vnc ber proxy server

Vnc ber proxy server

vnc ber proxy server

client/server technology that decouples a computer from the devices used to or in systems with client/server display architectures, a proxy server can. ation of our particular VNC-based application. We conclude in Section 5. There, untrusted proxy servers are given only encryp- ber RFC Use this to stay away from other VNC servers near It is useful for testing and for some workarounds. n may be a decimal num- ber, or 0x hex. WORKBENCH LEGS STEEL

Be sure to quote string if it contains spaces, shell characters, etc. If the external com- mand returns 0 the client is accepted, otherwise the client is rejected. See below for an extension to accept a client view- only. If x11vnc is running as root say from inetd 8 or from display managers xdm 1 , gdm 1 , etc , think about the security impli- cations carefully before supplying this option likewise for the -gone option.

If string is "popup" then a builtin popup window is used. The popup will time out after seconds, use "popup:N" to modify the timeout to N seconds use 0 for no timeout. If string is "xmessage" then an xmessage 1 invocation is used for the command. Both "popup" and "xmessage" will present an option for accepting the client "View-Only" the client can only watch. This option will not be presented if -viewonly has been specified, in which case the entire display is view only.

Note that x11vnc blocks while the external command or popup is running other clients may see no updates during this period. So a person sitting a the physical display is needed to respond to an popup prompt. More -accept tricks: use "popupmouse" to only allow mouse clicks in the builtin popup to be recognized.

Similarly use "popupkey" to only recognize keystroke responses. These are to help avoid the user accidentally accepting a client by typing or clicking. The default is to center the popup window. Unlike -accept, the command return code is not interpreted by x11vnc. The "popup" actions apply as well. If x11vnc is not running as root this option is ignored. Why use this option? In general it is not needed since x11vnc is already connected to the X display and can perform its pri- mary functions.

In particular under GNOME and KDE to implement the " -solid color " feature external commands gconftool-2 and dcop unfortu- nately must be run as the user owning the desktop session. Since this option switches userid it also affects the userid used to run the processes for the -accept and -gone options.

It also affects the ability to read files for options such as -con- nect, -allow, and -remap and also the ultra and tight filetrans- fer feature if enabled. Note that the -connect file is also sometimes written to. So be careful with this option since in some situations its use can decrease security. In general the switch to a user will only take place if the dis- play can still be successfully opened as that user this is pri- marily to try to guess the actual owner of the session.

Exam- ple: " -users fred,wilma,betty ". What happens next? Under display managers it may be a long time before the switch succeeds i. The latter i. Use the following notation to associate a group with a user: user1. Note that initgroups 2 will still be called first to try to switch to ALL of a user's groups primary and additional groups.

Only if that fails or it is not available then the single group specified as above or the user's primary group if not specified is switched to with set- gid 2. This sort of setting is only really needed to make the ultra or tight file- transfer permissions work properly.

Other- wise a user may be able to log in as another. This command can be of use in checking: "openssl x -text -in file. That user needs to be able to open the X display and any files of course. So it "lurks" waiting for anyone to log into an X session and then connects to it.

To enable a different searching mode, if the first user in the list is something like ":0" or "" that indicates a range of DISPLAY numbers that will be tried regardless of whether they are in the utmpx database for all users that are logged in. Also see the " -display WAIT They are not recommended for use on machines with untrustworthy local users.

Remote dis- plays can be polled this way: be careful this can use large amounts of network bandwidth. This is also of use if the local machine has a limited number of shm segments and -onetile is not sufficient. Ignored unless -noshm is set. Limits shm segments used to 3. To disable any automatic shm reduction set the env. The [color] is optional: the default color is "cyan4". For a different one specify the X color rgb.

This also works on native MacOSX. Other desktops won't work, send us the corresponding commands if you find them. If x11vnc guesses your desktop incorrectly, you can force it by prefixing color with "gnome:", "kde:", "cde:", "xfce:", or "root:". Update: -solid no longer works on KDE4. This mode works in a limited way on the Mac OS X Console with one color 'kelp' using the screensaver writing to the back- ground. If one of the items on the list is the string "noptr" the mouse pointer will not be allowed to go into a blacked out region.

Use " -noxwarppointer " if you do not want this. For use on legacy systems, e. See the xrandr 1 manpage and run 'xrandr -q' for more info. It is best to be viewing with a vncviewer that supports the NewFBSize en- coding, since it knows how to react to screen size changes. Otherwise, LibVNCServer tries to do so something reasonable for viewers that cannot do this portions of the screen may be clipped, unused, etc.

If a resize event is received, the full -xrandr mode is enabled. To disable even checking for events supply: -noxrandr. This mode could be useful on a handheld with portrait or landscape modes that do not cor- respond to the scanline order of the actual framebuffer.

If you do not want the cursor shape to be rotated prefix string with "nc:", e. Shortly after- wards the framebuffer is replaced with the real one. This is intended for use with vncviewers that do not support NewFBSize and one wants to make sure the initial viewer geometry will be big enough to handle all subsequent resizes e.

In -unixpw mode this sets the size of the login screen. Use "once:WxH" it ignore padgeom after the login screen is set up. Same as " -logfile file ". To append to the file use " -oa file " or " -logappend file ". This option could be useful by wrapper script to detect when x11vnc is ready. The file is created at startup if it does not already exist or if file is prefixed with "create:".

If the file is created, the x11vnc PID is placed in the file. Otherwise the files contents is not changed. Use prefix "nocreate:" to prevent creation. This is a convenience utility to avoid shell script wrappers, etc. You may specify as many of these as needed on the command line. Same as -copying and -warranty.

The -quiet option does not eliminate all informational output, it only reduces it. It is ignored in most auxiliary usage modes, e. Messages to stderr are lost unless -o logfile is used. Also useful in re- solving cases where a Keysym is bound to multiple keys e.

Default: -modtweak If you are having trouble with with keys and -xkb or -noxkb, and similar things don't help, try -nomodtweak. On some HP-UX systems it is been noted that they have an odd keymapping where a single keycode will have a keysym, e.

You can check via "xmodmap -pk" or the -dk option. The failure is when you try to type " " it yields "3". This is pow- erful and should be tried if there are still keymapping problems when using -modtweak by itself. The default is to check whether some common keysyms, e. To disable this automatic detection use -noxkb. When -xkb mode is active you can set these env. They ap- ply only when there is ambiguity as to which key to choose i.

If it is do not artificially press Shift to generate the keysym. If one side has CapsLock on and the other off and the keyboard is not behav- ing as you think it should you should correct the CapsLock states hint: pressing CapsLock inside and outside of the viewer can help toggle them both to the correct state. Also try -nomodtweak for a possible workaround. Nevertheless your capitalized letters come in over the wire and are applied cor- rectly to the x11vnc-side X server.

Note this mode probably won't do what you want in -nomodtweak mode. See also -capslock above. Perhaps these are keycodes not on your keyboard but your X server thinks exist. Currently only applies to -xkb mode. Run 'xmodmap -pk' to see your keymapping. Only use this option if you observe problems with some keystrokes. Added Keysyms will be re- moved periodically and also when x11vnc exits. The Lock modifiers are skipped. Used to clear the state if the display was accidentally left with any pressed down.

Format is one pair of Keysyms per line can be name or hex value separated by a space. If no file named string exists, it is instead inter- preted as this form: key1-key2,key3-key4, To map a key to a button click, use the fake Keysyms "Button1", This way those little used keys can be used to generate bigger hops than the Up and Down arrows provide.

One can scroll through text or web pages more quickly this way especially if x11vnc scroll detection is active. Use Button44, Button12, etc. To disable a keysym i. Dead keys: "dead" or silent, mute keys are keys that do not produce a character but must be followed by a 2nd keystroke. This is often used for accenting characters, e. Note that this interpretation is not part of core X11, it is up to the toolkit or application to decide how to react to the sequence.

However some VNC viewers send the keysyms "grave", "acute" instead thereby disabling the accenting. To work around this -remap can be used. Additional remaps may also be supplied via commas, e. This works around a repeating keystrokes bug triggered by long processing delays between key down and key up client events: either from large screen changes or high latency.

Default: -norepeat You can set the env. Note: your VNC viewer side will likely do autorepeating, so this is no loss unless someone is simultaneously at the real X dis- play. Use " -norepeat N " to set how many times norepeat will be reset if something else e. X session manager undoes it. The de- fault is 2. Use a negative value for unlimited resets.

Intended for use with Win2VNC and x2vnc dual-monitor setups. To work around apps setting the selection too frequently and messing up the other end. You can actually supply a comma separated list of directions, including "debug" to turn on debugging output.

The "mode" string is optional and is described below. The default is to show some sort of cursor shape s. How this is done depends on the VNC viewer and the X server. Use -nocursor to disable cursor shapes completely. Some VNC viewers support the TightVNC CursorPosUpdates and Cur- sorShapeUpdates extensions cuts down on network traffic by not having to send the cursor image every time the pointer is moved , in which case these extensions are used see -nocursor- shape and -nocursorpos below to disable.

For other viewers the cursor shape is written directly to the framebuffer every time the pointer is moved or changed and gets sent along with the other framebuffer updates. In this case, there will be some lag between the vnc viewer pointer and the remote cursor position. If the X display supports retrieving the cursor shape informa- tion from the X server, then the default is to use that mode.

A similar overlay scheme is used on IRIX. Xorg e. This can be disabled with -nocursor, and also some values of the "mode" option below. Note that under XFIXES cursors with transparency alpha channel will usually not be exactly represented and one may find Overlay preferable. See also the -alphacut and -alphafrac options below as fudge factors to try to improve the situation for cursors with transparency for a given theme. The "mode" string can be used to fine-tune the displaying of cursor shapes.

It can be used the following ways: " -cursor arrow " - just show the standard arrow nothing more or nothing less. Some desktops such as GNOME cover up the root window completely, and so this will not work, try "X1", etc, to try to shift the tree depth. On high latency links or slow machines there will be a time lag between expected and the actual cursor shape.

This is a complete hack, but may be useful in some situations because it provides a lit- tle more feedback about the cursor shape. This is useful if you want to be able to see Drag-and-Drop cursor icons, etc. Note: To work around a crash in Xorg 1.

The Xorg crash occurred right after a Display Manager e. GDM login. Starting with x11vnc 0. This option sets n as a cutoff for cursors that have transparency "alpha channel" with values ranging from 0 to Any cursor pixel with alpha value less than n becomes completely transparent.

Otherwise the pixel is completely opaque. Default -alphafrac fraction With the threshold in -alphacut some cursors will become almost completely transparent because their alpha values are not high enough. For those cursors adjust the alpha threshold until fraction of the non-zero alpha channel pixels become opaque.

Default 0. Specify this option to remove the alpha factor. The default is to send it. The alphablend effect will only be visible in -nocursorshape mode or for clients with cur- sorshapeupdates turned off. However there is a hack for 32bpp with depth 24, it uses the extra 8 bits to store cursor trans- parency for use with a hacked vncviewer that applies the trans- parency locally.

See -cursor above. Other clients will be able to see the pointer motions. Use this as a workaround if the pointer motion behaves incorrectly, e. To prevent this, use -noxwarppointer. Recent gui toolkits gnome have problems with x11vnc's original mouse input injection method. So x11vnc's mouse input injection method has been modified. Then x11vnc will always force positioning the mouse to the x,y position even if that position has not changed since the previous VNC input event. The first place this problem was noticed was in gnome terminal: if you pressed and released mouse button 3, a menu was posted and then its first element 'New Terminal Window' was activated.

This was because x11vnc injected the mouse position twice: once on ButtonPress and again on ButtonRelease. The toolkit inter- preted the 2nd one as mouse motion even though the mouse hadn't moved. So now by default x11vnc tries to avoid injecting the 2nd one. Note that with the new default x11vnc will be oblivious to ap- plications moving the pointer warping or the user at the phys- ical display moving it.

So it might, e. Note: mapping of button clicks to Keysyms may not work if -modtweak or -xkb is needed for the Keysym. Workaround: use -buttonmap IJ Greatly improves response on slow setups, but you lose all visual feedback for drags, text selection, and some menu traversals. Framebuffer memory n an integer times that of the full display is allocated below the actual framebuffer to cache screen contents for rapid retrieval.

Use 0 to disable. The n is actually optional, the default is Also, " -nonc " is the same as " -ncache 0 " This is an experimental option, currently implemented in an awk- ward way in that in the VNC Viewer you can see the pixel cache contents if you scroll down, etc.

So you will have to set things up so you can't see that region. If this method is suc- cessful, the changes required for clients to do this less awk- wardly will be investigated. Note that this mode consumes a huge amount of memory, both on the x11vnc server side and on the VNC Viewer side. As a rule of thumb, note that x at depth 24 is about 5MB of pixel data. For reasonable response when cycling through 4 to 6 large e. Because of the way window backingstore and saveunders are imple- mented, n must be even.

It will be incremented by 1 if it is not. Another is the window iconification animations need to be avoided see -macicontime. It appears the that the 'Scale' animation mode gives better re- sults than the 'Genie' one. Also, window event detection not as accurate as the X version. The wireframe will still be used when moving a window whose save-un- ders has not yet been set or has been invalidated.

Some VNC Viewers provide better response than others with this option. On Unix, realvnc viewer gives smoother drags than tightvnc viewer. Response may also be choppy if the server side machine is too slow. Sometimes on very slow modem connections, this actually gives an improvement because no pixel data at all not even the box ani- mation is sent during the drag. The de- fault is to assume it does, and so at the beginning of any wire- frame, etc, window moves the window will be pushed to top in the VNC viewer.

The default is to try to guess and when detected try to make the transistion more smoothly. For other window managers or desktops that provide animations, effects, compositing, translucency, etc. This can be used to try to improve the situation with dropshadows or other compositing e. MacOS X window man- ager , although it could make things worse. This is based completely on heuristics and may not always work: it depends on your window manager and even how you move things around. If you don't specify enough commas, the trailing parame- ters are set to their defaults.

This is a speedup to quickly exclude a window from being wireframed: set them all to zero to not try the speedup scrolling and selecting text will likely be slower. It can be "0" or "none" to skip it, "1" or "all" to apply it to any modifier, or "Shift", "Alt", "Control", "Meta", "Super", or "Hyper" to only apply for that type of modifier key. If a slow link is detected, these values may be automatically changed to some- thing better for a slow link.

Use this option to disable this behavior. This is the VNC CopyRect encoding: the framebuffer update doesn't need to send the actual new image data. Shorter aliases: -wcr [mode] and -nowcr "mode" can be "never" same as -nowirecopyrect to never try the copyrect, "top" means only do it if the window was not covered by any other windows, and "always" means to translate the orginally unobscured region this may look odd as the remaining pieces come in, but helps on a slow link.

Default: "always" Note: there can be painting errors or slow response when using -scale so you may want to disable CopyRect in this case " -wire- copyrect never " on the command line or by remote-control. Or you can also use the " -scale xxx:nocr " scale option.

Specify multiple times for more output. Or scrolling with a scroll- bar or mouse wheel. Shorter aliases: -scr [mode] and -noscr This scheme will not always detect scrolls, but when it does there is a nice speedup from using the VNC CopyRect encoding see -wirecopyrect. On the other hand, it may induce undesired transients e. These are automati- cally repaired in a short period of time. If this is unaccept- able disable the feature with -noscrollcopyrect. Both of these are modifier keys, and so should not generate characters when pressed by themselves.

Also, your VNC viewer may have its own refresh hot- key or button. Default: "always" Note: there can be painting errors or slow response when using -scale so you may want to disable CopyRect in this case " -scrollcopyrect never " on the command line or by remote-con- trol. This is to avoid wasting the effort on small rectangles that would be quickly up- dated the normal way. We want to be sure to skip the small scrollbar and get the large panel.

Some applications implement their scrolling in strange ways where the XCopyArea, etc, also applies to invisible portions of the window: if we CopyRect those areas it looks awful during the scroll and there may be painting errors left after the scroll. Use " " to denote the start of the application class e. If a pattern is prefixed with "KEY:" it only applies to Key- stroke generated scrolls e.

Up arrow. Default: Soffice. One probably wants to have ap- plication specific lists e. If list begins with the "-" character the list is taken as an exclude list: all keysyms except those list will be considered. The special string "builtin" expands to an internal list of keysyms that are likely to cause scrolls.

For example an annoying transient under scroll detection is if you hit Enter in a terminal shell with full text window, the solid text cursor block will be scrolled up. So for a short time there are two or more block cursors on the screen. There are similar scenarios, e. These transients are induced by the approximation of scroll de- tection e.

In nearly all cases these transient errors are repaired when the true X frame- buffer is consulted by the normal polling. But they are dis- tracting, so what this option provides is extra "padding" near the bottom of the terminal window: a few extra lines near the bottom will not be scrolled, but rather updated from the actual X framebuffer. This usually reduces the annoying artifacts. Use "none" to disable. A time per single scroll estimate is performed and if that estimate predicts a sustainable scrollrate of keys per second between "lo" and "hi" then repeated keys will be DIS- CARDED to maintain the scrollrate.

If -wireframe overlaps it takes precedence. This is a speedup to quickly exclude a window from being watched for scrollcopyrect: set them all to zero to not try the speedup things like selecting text will likely be slower. Hopefully you won't need this option, it is intended for cases when the -scrollcopyrect or -wirecopyrect features leave too many painting errors, but it can be used for any scenario.

This option periodically performs costly operations and so interac- tive response may be reduced when it is on. C sets how long to wait after a CopyRect to repaint the full screen. X sets how frequently to reread the full X11 framebuffer from the X server and push it out to con- nected viewers.

Use of X should be rare, please report a bug if you find you need it. Specify it multiple times for more output. This is currently used by the -scrollcopyrect scheme and to monitor X server grabs. This is only if the whole-server grabbing application expects mouse or keyboard input before re- leasing the grab. It is usually a window manager that does this. Or manually kill and restart the window manager if that is feasible. If you experience a lot of grab deadlock, please re- port a bug. The problem is pointer motion can cause rapid changes on the screen: consider the rapid changes when you drag a large window around opaquely.

Neither x11vnc's screen polling and vnc compression routines nor the bandwidth to the vncviewers can keep up these rapid screen changes: everything will bog down when dragging or scrolling. So a scheme has to be used to "eat" much of that pointer input before re-polling the screen and sending out framebuffer updates. The mode number n can be 0 to 4 and selects one of the schemes desribed below.

From this, it aggressively tries to push screen "frames" when it decides it has enough resources to do so. The default n is 2. Also note that these modes are not available in -threads mode which has its own pointer event handling mechanism. Default: 10 -allinput Have x11vnc read and process all available client input before proceeding.

Each client will get its own cursor and keyboard focus. Use the -speeds option to set these manually. If a value is left blank, e. SunRay, shadowfb, dummy driver, Xvfb , the read rate may be much faster. It is up to you to esti- mate the network bandwith and latency to clients. For the la- tency the ping 1 command can be used. For convenience there are some aliases provided, e.

The aliases are: "modem" for 6,4,; "dsl" for 6,,50; and "lan" for 6,,1 -wmdt string For some features, e. By default it tries to guess which one, but it can guess incorrectly. Anything else is interpreted as "root". Same as -dp and -dk, respectively. Use multiple times for more output. Used to cut down on load. What this does is per- form extra polls of the client socket at critical times before '-defer' and '-wait' calls.

A downside of these extra calls is that more mouse input may be processed than desired. Improves response, but in- creases the load whenever you are moving the mouse or typing. Default: 2. Some activities with no user input can slow things down a lot: consider a large terminal window with a long build running in it continuously streaming text output. By default x11vnc will try to detect this 3 screen polls in a row each longer than 0.

Use this option to disable that detec- tion. For special purpose usage where a low frame rate is acceptable and desirable, but you want the user input processed at the normal rate so you cannot use -wait. Use this only if applications misbehave by not repainting themselves properly. See also -noxdamage.

Default: take naps -sb time Time in seconds after NO activity e. Default: 60 Set the env. On slow links that take a long time to paint the first screen LibVNCServer may hit the timeout and drop the connection. Default: 20 seconds. This interferes with x11vnc's polling of the framebuffer data. See the xset 1 manpage for details. DPMS reduced power monitor states are a good thing and you nor- mally want the power down to take place usually x11vnc has no problem exporting the display in this state.

You probably only want to use " -nodpms " to work around problems with Screen Savers kicking on in DPMS low power states. Specifying " -nodpms " works around it. This is to prevent nosey people at the physical display from viewing what is on the screen. Be sure to lock the screen before disconnecting. This method is far from bullet proof, e. On many machines if he floods it with keyboard and mouse input he can see flashes of what is on the screen before the DPMS off state is reestablished.

For this to work securely there would need to be support in the X server to do this exactly rather than approximately with DPMS. This allows the VNC viewer to click a button that will cause the server x11vnc to try to disable keyboard and mouse input at the phys- ical display and put the monitor in dpms powered off state.

Use this option to skip powering off the monitor. That way the person on the VNC viewer-side can chat with the person at the physical X11 console. The ssvncviewer is used as a chat window helper. To spec- ify a different rfbversion, place it after the -chatwindow op- tion on the cmdline.

See also the remote control 'chaton' and 'chatoff' actions. These can also be set from the tkx11vnc GUI. Use -xdamage if your default is to have it off. So heuristics were introduced to skip large areas and use the damage rectangles only as "hints" for the traditional scanline polling. The default 1. Increase it if there are problems or decrease it to live on the edge perhaps useful on a slow machine.

For "ignore" LibVNCServer will handle the abrupt loss of a client and continue, for "exit" x11vnc will cleanup and exit at the 1st broken connection. This option is not really needed since LibVNCServer is doing the correct thing now for quite some time. However, for convenience you can use it to ignore other signals, e. You can also put "exit In this mode new threads one for input and one for output are created to handle each new client.

Default: -nothreads. Thread stability is much improved in version 0. Multiple clients in threaded mode should be stable for the ZRLE encoding on all platforms. The Tight and Zlib encodings are currently only stable on Linux for multiple clients.

For resizes randr, etc. This is to let various activ- ities settle. Default is about ms. Multiple clients in threaded mode could yield better performance for 'class-room' broadcasting usage; also in -appshare broadcast mode. See also the -reflect option. Default: 0. Used to improve text paging. Default: 4 -grow n Heuristic to grow islands of changed tiles n or wider by check- ing the tile near the boundary. Default: 3 -fuzz n Tolerance in pixels to mark a tiles edges as changed.

This setting also applies for non-X -rawfb modes. Under some circumstances this will improve in- teractive response, or at least make things look smoother, but in others most! To keep the "framerate" up the screen size x bpp cannot be too large. It may be of use in video capture-like applica- tions, webcams, or where window tearing is a problem.

Use "snap See shmat 1 and ipcs 1 If you do not supply a type "map" is assumed if the file exists see the next paragraphs for some exceptions to this. If string is "setup:cmd", then the command "cmd" is run and the first line from it is read and used as string. This allows ini- tializing the device, determining WxHxB, etc. These are often done as root so take care. If the masks are not provided x11vnc guesses them based on the bpp if the colors look wrong, you need to provide the masks.

This could be a normal width at 16bpp fb, but only width shows up. Most of the X11 screen, keyboard, mouse options do not make sense and many will cause this mode to crash, so please think twice before setting or changing them in a running x11vnc. Keeping the display open enables the default remote-control channel, which could be use- ful. Alternatively, if you specify -noviewonly, then the mouse and keyboard input are STILL sent to the X display, this usage should be very rare, i.

If the device is not "seekable" e. If you want x11vnc to dynamically transform a 24bpp rawfb to 32bpp note that this will be slower also supply the to32 option. This would be useful for, say, a video camera that de- livers the pixel data as 24bpp packed RGB.

This is the default under "video" mode if the bpp is The pixels will be padded out to 8 bpp using depth 8 truecolor. The scheme currently does not work with snap fb ask if interested. The idea is the Wx- HxB will be extracted from the device itself.

So if you do not supply " WxHxB It first tries the v4l API if that support has been compiled in. Otherwise it will run the v4l- info 1 external program if it is available. The v4l API must be available for this to work. Otherwise, you will need to try to initialize the device with an external program, e.

The device's brightness, color, contrast, and hue can be set to per- centages, e. The device filename can be set too if needed if it does not start with "video" , e. The width, height and bpp of the framebuffer can be set via, e. Use the name that is in the information about the device that is printed at startup.

For input channels with tuners e. XXX is the station number. Currently only the ntsc-cable-us US cable channels are built into x11vnc. See the -freqtab option below to supply one from xawtv. Note that not all video capture devices will support all of the above settings. As a shortcut, if the string begins "Video.. As above, if you specify a " WxHxB Otherwise the device will be queried. There is, however, the basic LinuxVNC functionality in x11vnc if you replace "console" with "vt" in the examples below.

The latter is used to inject keystrokes not all are supported, but the basic ones are. Otherwise there will be a 'No such device' error. You can also load a Linux framebuffer driver specific to your make of video card for more functionality. Once the machine is booted one can often 'mod- probe' the fb driver as root to obtain a framebuffer device.

Note that this mode can only show text and not graphics. QT-embedded linux console apps. It also provides more accurate keystroke insertion. You may also want to also use the -nodragging and -cursor none options. Note you can change the Linux VT remotely using the chvt 1 com- mand to make the one you want be the active one e. Sometimes switching out and back corrects the framebuffer's graphics state. For the " -rawfb vtN " mode there is no need to switch the VT's.

To skip input injecting entirely use "consolex" or "vtx". This can be used to specify a different framebuffer de- vice, e. This mode is really only of use if you are trying to improve performance in the case of many e. However, another user found this mode useful to export a demo display through a slow link: then multiple demo viewers connected to the reflecting x11vnc on the fast side of the link, and so avoided all of the demo view- ers going through the slow link.

For example, if there will be 64 simultaneous VNC viewers this can lead to a lot of redundant VNC traffic to and from the server host:N, extra CPU usage, and all viewers response can be reduced by having to wait for writes to the slowest client to finish. Each repeater then handles 8 vnc viewer connections thereby spreading the load around.

In classroom broadcast us- age, try to put the repeaters on different switches. This mode is the same as -reflect host:N. Replace "host:N" by "listen" or "listen:port" for a reverse connection. Overall performance will not be as good as a single direct con- nection because, among other things, there is an additional level of framebuffer polling and pointer motion can still induce many changes per second that must be propagated.

Tip: if the remote VNC is x11vnc doing wireframing, or an X display that does wireframing that gives much better response than opaque window dragging. Consider the -nodragging option if the problem is severe. The env. See the function rfbGetClient in libvncclient for more info. Use -noshared as a subse- quent cmdline option to disable sharing. Instead of using the built in ntsc-cable-us mapping of station number to frequency, use the data in file. For stations that are not numeric, e.

SE20, they are placed above the highest numbered station in the order they are found. In -pipeinput mode by default x11vnc will not process any of the user input events. If you prefix cmd with "tee:" it will both send them to the pipe command and process them. An- other prefix is "reopen" which means to reopen pipe if it exits.

Separate multiple prefixes with commas. In combination with -rawfb one might be able to do amusing things e. Do 'env grep X11VNC' for more. Built-in pipeinput modes no external program required : If cmd is "VID" and you are using the -rawfb for a video capture device, then an internal list of keyboard mappings is used to set parameters of the video. The mappings are: "B" and "b" adjust the brightness up and down.

Up and Down arrows adjust the station if a tuner F1, F2, See -rawfb video for de- tails. You may want to use the options -cursor none and -nodragging in this mode. Which uinput is injected can be controlled by an option string made of the characters "K", "M", and "B" see the -input op- tion , e. This is used to correct raw mouse relative motion into how much the application cursor moves x11vnc has no control over, or knowledge of how the windowing application interprets the raw mouse motions.

Typically the acceleration for an X display is 2 see xset "m" option. Note: the default acceleration is 2. Even with a correct accel setting the mouse position will get out of sync probably due to a mouse "threshold" setting where the acceleration doe not apply, set xset 1. It is currently not working well. Note that a touchpad on a laptop is an absolute de- vice to some degree. This usually avoids all the problems with mouse acceleration. For touchscreens, when a mouse button is pressed, a pressure increase is injected, and when the button is released a pressure of zero is injected.

To get accurate or even usable posi- tioning this is required when tslib is in use. Any input class not directly specified as above will be handled via the uinput mechanism. To disable creating a uinput device and thereby discarding unhan- dled input , specify "nouinput".

You can set the env. In -ncache mode this value will be used to skip the animation if possible. Also, screen resolution and pixel depth changes will not be automatically detected unless the deprecated framebuffer interfaces are allowed. Requires the "wish" program to be installed on the machine.

Currently there are these types of items: 1 a gui mode, a 2 gui "sim- plicity", 3 the X display the gui should display on, 4 a "tray" or "icon" mode, and 5 a gui geometry. For example, if you ssh in and x11vnc is not running yet you may want the gui to come back to you via your ssh redirected X display e. The color of the icon indicates status con- nected clients and there is also a balloon status. Clicking on the icon gives a menu from which properties, etc, can be set and the full gui is available under "Advanced".

To be fully func- tional, the gui mode should be "start" the default. If you want only one viewer connec- tion include the -once option. For "icon" the gui just a small standalone window. For "tray" it will attempt to embed itself in the "system tray" if possi- ble. You can also specify width and height, i. In "tray" mode the geometry is ignored unless the system tray manager does not seem to be running.

The last two only apply for the tray icon mode. After the re- mote control command is sent to the running server the 'x11vnc -remote You can often use the -query command see below to see if the x11vnc server processed your -remote command. Alternatively, use the -display and -auth options to set them to the correct values.

The running server cannot use the -novncconnect option because that disables the communication channel. See below for alternate channels. For example: 'x11vnc -remote stop' which is the same as 'x11vnc -R stop' will close down the x11vnc server. To use a different name for the X11 property e. To run a bunch of commands in a sequence use something like: x11vnc -R 'script:firstcmd;secondcmd; The ';' separator must still be used to separate each command.

Same as "zero", also "zero:x1,y1,x2,y2" for a rectangle. See -connect. Passwords required as with fwd connections. Use host "all" to close all current clients. If you know the client internal hex ID, e. In -ssl mode two connections are allowed i. See -allow and -localhost. See -remap for the form of "str" basically: key1-key2,key3-key4, Both of these pro- grams are for 'pointer and keyboard' sharing between separate X displays.

In general the two displays are usually nearby, e. The user moves the mouse to an edge and then the mouse pointer appears to 'jump' to the other display screen. Thus it emulates what a single X server would do for two screens e. In what follows the 'master' display refers to the one that when it has 'focus' it is basically doing nothing besides watching for the mouse to go over an edge.

The 'slave' display refers to the one to which the mouse and keyboard is redirected to once an edge in the master has been crossed. Use "M2S" and "S2M" as shorter aliases. If you do not specify "up", etc. Otherwise, the returned string will contain "DONE". Under grab failure the string will be fol- lowed by ":p1,k1-p2,k2" where p1,k1 indicates the initial pointer and keyboard grab states and p2,k2 the final ones. Under some circumstances xprop 1 can used if it supports -set see the FAQ.

Multiple queries can be done by separat- ing variables by commas, e. Some -remote commands are pure actions that do not make sense as variables, e. Use -sync to have the program wait for an acknowledgement from the x11vnc server that command was processed somehow.

On the other hand -query requests are always processed synchronously because they have to wait for the answer. Also note that if both -remote and -query requests are supplied on the command line, the -remote is processed first syn- chronously: no need for -sync , and then the -query request is processed in the normal way. This allows for a reliable way to see if the -remote command was processed by querying for any new settings. Note however that there is timeout of a few seconds see the next paragraph so if the x11vnc takes longer than that to process the requests the requester will think that a failure has taken place.

The default is to wait 3. If cmd matches 'script:' then it will wait up to Note: the response is not checked for validity or whether it corresponds to the query sent. The query "ping:mystring" may be used to help uniquely identify the query. Up to n retries will take place until the matching string is found in the output text. If the match string is never found the program's exit code is 1; if the match is found it exits with 0.

Note that there may be stdout printed for each retry i. If a VNC client sends rfb- CutText having the prefix str then the part after it is pro- cessed as though it were sent via 'x11vnc -remote Viewed times. Hard to explain. I hope you can understand me. Improve this question. Micha93 Micha93 7 7 silver badges 20 20 bronze badges.

Add a comment. Sorted by: Reset to default. Highest score default Date modified newest first Date created oldest first. Pull all scripting to a single shell script. Debug single shell script. Avoid debugging handling service unit once deployed. Instead debug and modify called script. Use user nobody user, to debug script to run without environment context and without shell.

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