vnc only allows 2 users Post: 302932572

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Operating Systems Solaris vnc only allows 2 users Post 302932572 by DGPickett on Thursday 22nd of January 2015 02:58:32 PM

01-22-2015

Registered User

It looks like another app is using 59?? ports. Does vncserver check for taken ports both 60?? and 59??, if not a vnc bug. Yes, vncserver checks both ports:

Code:

#
# GetDisplayNumber gets the lowest available display number.  A display number
# n is taken if something is listening on the VNC server port (5900+n) or the
# X server port (6000+n).
#
sub GetDisplayNumber
{
    foreach $n (1..99) {
        if (&CheckDisplayNumber($n)) {
            return $n+0; # Bruce Mah's workaround for bug in perl 5.005_02
        }
    }
    die "$prog: no free display number on $host.\n";
}
 
#
# CheckDisplayNumber checks if the given display number is available.  A
# display number n is taken if something is listening on the VNC server port
# (5900+n) or the X server port (6000+n).
#
sub CheckDisplayNumber
{
    local ($n) = @_;
    socket(S, $AF_INET, $SOCK_STREAM, 0) || die "$prog: socket failed: $!\n";
    eval 'setsockopt(S, &SOL_SOCKET, &SO_REUSEADDR, pack("l", 1))';
    if (!bind(S, pack('S n x12', $AF_INET, 6000 + $n))) {
        close(S);
        return 0;
    }
    close(S);
    socket(S, $AF_INET, $SOCK_STREAM, 0) || die "$prog: socket failed: $!\n";
    eval 'setsockopt(S, &SOL_SOCKET, &SO_REUSEADDR, pack("l", 1))';
    if (!bind(S, pack('S n x12', $AF_INET, 5900 + $n))) {
        close(S);
        return 0;
    }
    close(S);
    if (-e "/tmp/.X$n-lock") {
        warn "\nWarning: $host:$n is taken because of /tmp/.X$n-lock\n";
        warn "Remove this file if there is no X server $host:$n\n";
        return 0;
    }
    if (-e "/tmp/.X11-unix/X$n") {
        warn "\nWarning: $host:$n is taken because of /tmp/.X11-unix/X$n\n";
        warn "Remove this file if there is no X server $host:$n\n";
        return 0;
    }
    if (-e "/usr/spool/sockets/X11/$n") {
        warn("\nWarning: $host:$n is taken because of ".
             "/usr/spool/sockets/X11/$n\n");
        warn "Remove this file if there is no X server $host:$n\n";
        return 0;
    }
    return 1;
}

It'd be interesting to see the lsof of those ports, who is using them for what, but you need to be root for that (to see all user info). You'd think 100 ports would be enough.

DGPickett

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LEARN ABOUT SUSE

vncserver

vncserver(1)							     TightVNC							      vncserver(1)

NAME

       vncserver - a wrapper to launch an X server for VNC.

SYNOPSIS

       vncserver [:display] [-geometry widthxheight] [-depth depth] [-pixelformat rgbNNN|bgrNNN] [-name desktop-name] [Xvnc-options...]

       vncserver -kill :display

       vncserver -help

DESCRIPTION

       vncserver is a wrapper script for Xvnc, the free X server for VNC (Virtual Network Computing). It provides all capabilities of a standard X
       server, but does not connect to a display for itself.  Instead, Xvnc creates a virtual desktop you can view or control remotely using a VNC
       viewer.

OPTIONS

       You  can  add  Xvnc  options at the command line. They will be added to the invocation of Xvnc without changes. The options provided by the
       vncserver itself are as follows:

       :display
	      The display number to use. If omitted, the next free display number is used.

       -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.

       -name string
	      This specifies the name of the desktop.

       -kill :display
	      Stops the session running on the specified display.

       -help  Prints a short usage notice to stderr.

EXAMPLES

       vncserver
	      Invokes Xvnc on the next available display and with suitable defaults.

       vncserver :1
	      Invokes Xvnc on display :1.

       vncserver -geometry 800x600 -depth 16 :1
	      Invokes Xvnc on display :1 with desktop size of 800x600 pixels and color depth of 16 bits per pixel.

       vncserver -kill :1
	      Shuts down Xvnc server on display :1.

SEE ALSO

       Xvnc(1), vncviewer(1), vncpasswd(1), vncconnect(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@ruhr-uni-bochum.de>,
       Tim Waugh <twaugh@redhat.com>,
       Constantin Kaplinsky <const@tightvnc.com>

								    August 2006 						      vncserver(1)

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