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* Add a module that enables a x11vnc-based terminal server, allowing

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users to login via VNC.  Xvfb servers are started as required to
  allow multiple concurrent users.

svn path=/nixos/trunk/; revision=30374
This commit is contained in:
Eelco Dolstra 2011-11-10 20:52:23 +00:00
parent c1d7c0d6bd
commit 21d808ee6c
1 changed files with 66 additions and 0 deletions
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66
modules/services/x11/terminal-server.nix Normal file
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# This module implements a terminal service based on ‘x11vnc’. It
# listens on port 5900 for VNC connections. It then presents a login
# screen to the user. If the user successfully authenticates, x11vnc
# checks to see if a X server is already running for that user. If
# not, a X server (Xvfb) is started for that user. The Xvfb instances
# persist across VNC sessions.
{ config, pkgs, ... }:
with pkgs.lib;
let
# Wrap Xvfb to set some flags/variables.
xvfbWrapper = pkgs.writeScriptBin "Xvfb"
''
#! ${pkgs.stdenv.shell}
export XKB_BINDIR=${pkgs.xorg.xkbcomp}/bin
export XORG_DRI_DRIVER_PATH=${pkgs.mesa}/lib/dri
exec ${pkgs.xorg.xorgserver}/bin/Xvfb "$@" -xkbdir "${pkgs.xkeyboard_config}/etc/X11/xkb"
'';
# ‘xinetd’ is insanely braindamaged in that it sends stderr to
# stdout. Thus requires just about any xinetd program to be
# wrapped to redirect its stderr. Sigh.
x11vncWrapper = pkgs.writeScriptBin "x11vnc-wrapper"
''
#! ${pkgs.stdenv.shell}
export PATH=${makeSearchPath "bin" [ xvfbWrapper pkgs.gawk pkgs.which pkgs.openssl pkgs.xorg.xdpyinfo pkgs.xorg.xauth pkgs.nettools pkgs.shadow pkgs.procps pkgs.utillinux pkgs.bash ]}:$PATH
export FD_GEOM=1024x786x24
exec ${pkgs.x11vnc}/bin/x11vnc -inetd -display WAIT:1024x786:cmd=FINDCREATEDISPLAY-Xvfb.xdmcp -unixpw -ssl SAVE 2> /var/log/x11vnc.log
'';
in
{
config = {
services.xserver.enable = true;
# Enable KDM. Any display manager will do as long as it supports XDMCP.
services.xserver.displayManager.kdm.enable = true;
services.xserver.displayManager.kdm.enableXDMCP = true;
services.xserver.displayManager.kdm.extraConfig =
''
[General]
# We're headless, so don't bother starting an X server.
StaticServers=
[Xdmcp]
Xaccess=${pkgs.writeText "Xaccess" "localhost"}
'';
services.xinetd.enable = true;
services.xinetd.services = singleton
{ name = "x11vnc";
port = 5900;
unlisted = true;
user = "root";
server = "${x11vncWrapper}/bin/x11vnc-wrapper";
};
};
}