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