79 lines
1.9 KiB
Nix
79 lines
1.9 KiB
Nix
{pkgs, config, ...}:
|
|
|
|
###### interface
|
|
let
|
|
inherit (pkgs.lib) mkOption mkIf;
|
|
|
|
options = {
|
|
networking = {
|
|
interfaceMonitor = {
|
|
|
|
enable = mkOption {
|
|
default = false;
|
|
description = "
|
|
If <literal>true</literal>, monitor Ethernet interfaces for
|
|
cables being plugged in or unplugged. When this occurs, the
|
|
<command>dhclient</command> service is restarted to
|
|
automatically obtain a new IP address. This is useful for
|
|
roaming users (laptops).
|
|
";
|
|
};
|
|
|
|
beep = mkOption {
|
|
default = false;
|
|
description = "
|
|
If <literal>true</literal>, beep when an Ethernet cable is
|
|
plugged in or unplugged.
|
|
";
|
|
};
|
|
};
|
|
};
|
|
};
|
|
in
|
|
|
|
###### implementation
|
|
|
|
let
|
|
|
|
inherit (pkgs) ifplugd writeScript bash;
|
|
|
|
# The ifplugd action script, which is called whenever the link
|
|
# status changes (i.e., a cable is plugged in or unplugged). We do
|
|
# nothing when a cable is unplugged. When a cable is plugged in, we
|
|
# restart dhclient, which will hopefully give us a new IP address
|
|
# if appropriate.
|
|
plugScript = writeScript "ifplugd.action" "#! ${bash}/bin/sh
|
|
if test \"$2\" = up; then
|
|
initctl stop dhclient
|
|
sleep 1
|
|
initctl start dhclient
|
|
fi
|
|
";
|
|
|
|
in
|
|
|
|
mkIf config.networking.interfaceMonitor.enable {
|
|
require = [
|
|
options
|
|
];
|
|
|
|
services = {
|
|
extraJobs = [{
|
|
name = "ifplugd";
|
|
|
|
extraPath = [ifplugd];
|
|
|
|
job = ''
|
|
description "Network interface connectivity monitor"
|
|
|
|
start on network-interfaces/started
|
|
stop on network-interfaces/stop
|
|
|
|
respawn ${ifplugd}/sbin/ifplugd --no-daemon --no-startup --no-shutdown \
|
|
${if config.networking.interfaceMonitor.beep then "" else "--no-beep"} \
|
|
--run ${plugScript}
|
|
'';
|
|
}];
|
|
};
|
|
}
|