146 lines
4.5 KiB
Nix
146 lines
4.5 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) dhcpcd;
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# Don't start dhcpcd on explicitly configured interfaces or on
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# interfaces that are part of a bridge.
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ignoredInterfaces =
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map (i: i.name) (filter (i: i.ipAddress != null) (attrValues config.networking.interfaces))
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++ concatLists (attrValues (mapAttrs (n: v: v.interfaces) config.networking.bridges))
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++ config.networking.dhcpcd.denyInterfaces;
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# Config file adapted from the one that ships with dhcpcd.
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dhcpcdConf = pkgs.writeText "dhcpcd.conf"
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''
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# Inform the DHCP server of our hostname for DDNS.
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hostname
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# A list of options to request from the DHCP server.
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option domain_name_servers, domain_name, domain_search, host_name
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option classless_static_routes, ntp_servers, interface_mtu
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# A ServerID is required by RFC2131.
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# Commented out because of many non-compliant DHCP servers in the wild :(
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#require dhcp_server_identifier
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# A hook script is provided to lookup the hostname if not set by
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# the DHCP server, but it should not be run by default.
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nohook lookup-hostname
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# Ignore peth* devices; on Xen, they're renamed physical
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# Ethernet cards used for bridging. Likewise for vif* and tap*
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# (Xen) and virbr* and vnet* (libvirt).
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denyinterfaces ${toString ignoredInterfaces} peth* vif* tap* tun* virbr* vnet* vboxnet*
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${config.networking.dhcpcd.extraConfig}
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'';
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# Hook for emitting ip-up/ip-down events.
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exitHook = pkgs.writeText "dhcpcd.exit-hook"
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''
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#exec >> /var/log/dhcpcd 2>&1
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#set -x
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params="IFACE=$interface REASON=$reason"
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# only works when interface is wireless and wpa_supplicant has a control socket
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# but we allow it to fail silently
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${optionalString config.networking.wireless.enable ''
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params+=" $(${pkgs.wpa_supplicant}/sbin/wpa_cli -i$interface status 2>/dev/null | grep ssid | sed 's|^b|B|;s|ssid|SSID|' | xargs)"
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''}
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if [ "$reason" = BOUND -o "$reason" = REBOOT ]; then
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# Restart ntpd. We need to restart it to make sure that it
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# will actually do something: if ntpd cannot resolve the
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# server hostnames in its config file, then it will never do
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# anything ever again ("couldn't resolve ..., giving up on
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# it"), so we silently lose time synchronisation.
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${config.systemd.package}/bin/systemctl try-restart ntpd.service
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${config.systemd.package}/bin/systemctl start ip-up.target
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fi
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#if [ "$reason" = EXPIRE -o "$reason" = RELEASE -o "$reason" = NOCARRIER ] ; then
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# ${config.systemd.package}/bin/systemctl start ip-down.target
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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.dhcpcd.denyInterfaces = mkOption {
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default = [];
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description = ''
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Disable the DHCP client for any interface whose name matches
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any of the shell glob patterns in this list. The purpose of
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this option is to blacklist virtual interfaces such as those
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created by Xen, libvirt, LXC, etc.
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'';
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};
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networking.dhcpcd.extraConfig = mkOption {
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default = "";
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description = ''
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Literal string to append to the config file generated for dhcpcd.
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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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systemd.services.dhcpcd =
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{ description = "DHCP Client";
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wantedBy = [ "network.target" ];
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after = [ "systemd-udev-settle.service" ];
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# Stopping dhcpcd during a reconfiguration is undesirable
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# because it brings down the network interfaces configured by
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# dhcpcd. So do a "systemctl restart" instead.
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stopIfChanged = false;
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path = [ dhcpcd pkgs.nettools pkgs.openresolv ];
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unitConfig.ConditionCapability = "CAP_NET_ADMIN";
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serviceConfig =
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{ Type = "forking";
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PIDFile = "/run/dhcpcd.pid";
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ExecStart = "@${dhcpcd}/sbin/dhcpcd dhcpcd --config ${dhcpcdConf}";
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ExecReload = "${dhcpcd}/sbin/dhcpcd --rebind";
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StandardError = "null";
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Restart = "always";
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};
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};
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environment.systemPackages = [ dhcpcd ];
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environment.etc =
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[ { source = exitHook;
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target = "dhcpcd.exit-hook";
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}
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];
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powerManagement.resumeCommands =
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''
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# Tell dhcpcd to rebind its interfaces if it's running.
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${config.systemd.package}/bin/systemctl reload dhcpcd.service
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'';
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};
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}
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