forked from mirrors/nixpkgs
112 lines
3.4 KiB
Nix
112 lines
3.4 KiB
Nix
{ config, pkgs, ... }:
|
|
|
|
with pkgs.lib;
|
|
|
|
let
|
|
|
|
inherit (pkgs) nettools dhcp lib;
|
|
|
|
# Don't start dhclient on explicitly configured interfaces or on
|
|
# interfaces that are part of a bridge.
|
|
ignoredInterfaces =
|
|
map (i: i.name) (lib.filter (i: i ? ipAddress && i.ipAddress != "" ) config.networking.interfaces)
|
|
++ concatLists (attrValues (mapAttrs (n: v: v.interfaces) config.networking.bridges));
|
|
|
|
stateDir = "/var/lib/dhcp"; # Don't use /var/state/dhcp; not FHS-compliant.
|
|
|
|
dhclientExitHooks = pkgs.writeText "dhclient-exit-hooks"
|
|
''
|
|
#echo "$reason" >> /tmp/dhcp-exit
|
|
#echo "$exit_status" >> /tmp/dhcp-exit
|
|
|
|
if test "$reason" = BOUND -o "$reason" = REBOOT; then
|
|
# Restart ntpd. (The "ip-up" event below will trigger the
|
|
# restart.) We need to restart it to make sure that it will
|
|
# actually do something: if ntpd cannot resolve the server
|
|
# hostnames in its config file, then it will never do
|
|
# anything ever again ("couldn't resolve ..., giving up on
|
|
# it"), so we silently lose time synchronisation.
|
|
${config.system.build.upstart}/sbin/initctl stop ntpd
|
|
|
|
${config.system.build.upstart}/sbin/initctl emit -n ip-up
|
|
fi
|
|
|
|
if test "$reason" = EXPIRE -o "$reason" = RELEASE; then
|
|
${config.system.build.upstart}/sbin/initctl emit -n ip-down
|
|
fi
|
|
'';
|
|
|
|
in
|
|
|
|
{
|
|
|
|
###### implementation
|
|
|
|
config = mkIf config.networking.useDHCP {
|
|
|
|
# dhclient barfs if /proc/net/if_inet6 doesn't exist.
|
|
boot.kernelModules = [ "ipv6" ];
|
|
|
|
jobs.dhclient =
|
|
{ startOn = "started network-interfaces";
|
|
stopOn = "stopping network-interfaces";
|
|
|
|
path = [ dhcp ];
|
|
|
|
script =
|
|
''
|
|
# Determine the interface on which to start dhclient.
|
|
interfaces=
|
|
|
|
for i in $(cd /sys/class/net && ls -d *); do
|
|
# Only run dhclient on interfaces of type ARPHRD_ETHER
|
|
# (1), i.e. Ethernet. Ignore peth* devices; on Xen,
|
|
# they're renamed physical Ethernet cards used for
|
|
# bridging. Likewise for vif* and tap* (Xen) and
|
|
# virbr* and vnet* (libvirt) and veth* (cgroup).
|
|
if [ "$(cat /sys/class/net/$i/type)" = 1 ]; then
|
|
if ! for j in ${toString ignoredInterfaces}; do echo $j; done | grep -F -x -q "$i" &&
|
|
! echo "$i" | grep -x -q "peth.*\|vif.*\|tap.*\|virbr.*\|vnet.*\|veth.*";
|
|
then
|
|
echo "Running dhclient on $i"
|
|
interfaces="$interfaces $i"
|
|
fi
|
|
fi
|
|
done
|
|
|
|
if test -z "$interfaces"; then
|
|
echo 'No interfaces on which to start dhclient!'
|
|
exit 1
|
|
fi
|
|
|
|
mkdir -m 755 -p ${stateDir}
|
|
|
|
exec dhclient -d $interfaces -e "PATH=$PATH" -lf ${stateDir}/dhclient.leases -sf ${dhcp}/sbin/dhclient-script
|
|
'';
|
|
};
|
|
|
|
environment.systemPackages = [dhcp];
|
|
|
|
environment.etc =
|
|
[ # Dhclient hooks for emitting ip-up/ip-down events.
|
|
{ source = dhclientExitHooks;
|
|
target = "dhclient-exit-hooks";
|
|
}
|
|
];
|
|
|
|
powerManagement.resumeCommands =
|
|
''
|
|
${config.system.build.upstart}/sbin/restart dhclient
|
|
'';
|
|
|
|
networking.interfaceMonitor.commands =
|
|
''
|
|
if [ "$status" = up ]; then
|
|
${config.system.build.upstart}/sbin/restart dhclient
|
|
fi
|
|
'';
|
|
|
|
};
|
|
|
|
}
|