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 OPENSOLARIS

vncpasswd

vncpasswd(1)						     Virtual Network Computing						      vncpasswd(1)

NAME

       vncpasswd - change a VNC password

SYNOPSIS

       vncpasswd [passwd-file]

DESCRIPTION

       vncpasswd  allows  you  to set the password used to access VNC desktops.  It stores an obfuscated version of the password in the given file
       (default $HOME/.vnc/passwd).  The vncserver script runs vncpasswd the first time you start a VNC desktop, and invokes Xvnc with the  appro-
       priate -rfbauth option.	vncviewer can also be given a password file to use via the -passwd option.

       The  password  must be at least six characters long, and only the first eight characters are significant.  Note that the stored password is
       not encrypted securely - anyone who has access to this file can trivially find out the plaintext password, so vncpasswd always sets  appro-
       priate  permissions  (read and write only by the owner).  However, when accessing a VNC desktop a challenge-response mechanism is used over
       the wire making it hard for anyone to crack the password simply by snooping on the network.

FILES

       $HOME/.vnc/passwd
	      Default location of the VNC password file.

SEE ALSO

       vncviewer(1), vncserver(1), Xvnc(1) vncconfig(1),
       http://www.realvnc.com

AUTHOR

       Tristan Richardson, RealVNC Ltd.

       VNC was originally developed by the RealVNC team while at Olivetti Research Ltd / AT&T Laboratories Cambridge.  It is now being	maintained
       by RealVNC Ltd.	See http://www.realvnc.com for details.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |				   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |				   |
       +-----------------------------+-----------------------------+

RealVNC Ltd							    03 Mar 2005 						      vncpasswd(1)

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