110 lines
3 KiB
Nix
110 lines
3 KiB
Nix
{pkgs, config, ...}:
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let
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inherit (pkgs.lib) mkOption mkIf mergeEnableOption mergeListOption;
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inherit (pkgs) nettools dhcp lib;
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# Don't start dhclient on explicitly configured interfaces.
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ignoredInterfaces = ["lo" "wmaster0"] ++
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map (i: i.name) (lib.filter (i: i ? ipAddress) config.networking.interfaces);
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stateDir = "/var/lib/dhcp"; # Don't use /var/state/dhcp; not FHS-compliant.
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dhclientExitHooks = pkgs.writeText "dhclient-exit-hooks"
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''
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echo "$reason" >> /tmp/dhcp-exit
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echo "$exit_status" >> /tmp/dhcp-exit
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if test "$reason" = BOUND -o "$reason" = REBOOT; then
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${pkgs.glibc}/sbin/nscd --invalidate hosts
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# Restart ntpd. (The "ip-up" event below will trigger the
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# restart.) We need to restart it to make sure that it will
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# actually do something: if ntpd cannot resolve the server
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# hostnames in its config file, then it will never do
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# anything ever again ("couldn't resolve ..., giving up on
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# it"), so we silently lose time synchronisation.
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${pkgs.upstart}/sbin/initctl stop ntpd
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${pkgs.upstart}/sbin/initctl emit ip-up
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fi
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if test "$reason" = EXPIRE -o "$reason" = RELEASE; then
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${pkgs.upstart}/sbin/initctl emit ip-down
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fi
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'';
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in
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{
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###### interface
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options = {
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networking.useDHCP = mkOption {
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default = true;
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merge = mergeEnableOption;
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description = "
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Whether to use DHCP to obtain an IP adress and other
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configuration for all network interfaces that are not manually
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configured.
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";
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};
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};
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###### implementation
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config = mkIf config.networking.useDHCP {
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jobs = pkgs.lib.singleton
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{ name = "dhclient";
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startOn = "network-interfaces/started";
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stopOn = "network-interfaces/stop";
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preStart =
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''
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# dhclient barfs if /proc/net/if_inet6 doesn't exist.
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${config.system.sbin.modprobe}/sbin/modprobe ipv6 || true
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'';
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script =
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''
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# Determine the interface on which to start dhclient.
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interfaces=
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for i in $(cd /sys/class/net && ls -d *); do
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if ! for j in ${toString ignoredInterfaces}; do echo $j; done | grep -F -x -q "$i"; then
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echo "Running dhclient on $i"
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interfaces="$interfaces $i"
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fi
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done
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if test -z "$interfaces"; then
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echo 'No interfaces on which to start dhclient!'
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exit 1
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fi
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mkdir -m 755 -p ${stateDir}
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exec ${dhcp}/sbin/dhclient -d $interfaces -e "PATH=$PATH" -lf ${stateDir}/dhclient.leases -sf ${dhcp}/sbin/dhclient-script
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'';
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};
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environment.systemPackages = [dhcp];
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environment.etc =
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[ # Dhclient hooks for emitting ip-up/ip-down events.
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{ source = dhclientExitHooks;
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target = "dhclient-exit-hooks";
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}
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];
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};
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}
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