103 lines
3.3 KiB
Nix
103 lines
3.3 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 dhclient 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 && i.ipAddress != "" ) config.networking.interfaces)
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++ concatLists (attrValues (mapAttrs (n: v: v.interfaces) config.networking.bridges));
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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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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) and veth* (cgroups).
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denyinterfaces ${toString ignoredInterfaces} peth* vif* tap* tun* virbr* vnet* vboxnet* veth*
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'';
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# Hook for emitting ip-up/ip-down events.
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exitHook = pkgs.writeText "dhcpcd.exit-hook"
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''
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#exec >> /var/log/dhcpcd 2>&1
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#set -x
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params="IFACE=$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 "$reason" = REBOOT ]; then
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# Restart ntpd. (The "ip-up" event below will trigger the
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# restart.) We need to restart it to make sure that it will
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# actually do something: if ntpd cannot resolve the server
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# hostnames in its config file, then it will never do
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# anything ever again ("couldn't resolve ..., giving up on
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# it"), so we silently lose time synchronisation.
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${config.system.build.upstart}/sbin/initctl stop ntpd
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${config.system.build.upstart}/sbin/initctl emit -n ip-up $params
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fi
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if [ "$reason" = EXPIRE -o "$reason" = RELEASE -o "$reason" = NOCARRIER ] ; then
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${config.system.build.upstart}/sbin/initctl emit -n ip-down $params
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fi
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'';
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in
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{
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###### implementation
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config = mkIf config.networking.useDHCP {
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jobs.dhcpcd =
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{ startOn = "started network-interfaces";
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path = [ dhcpcd pkgs.nettools pkgs.openresolv ];
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exec = "dhcpcd --config ${dhcpcdConf} --nobackground";
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};
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environment.systemPackages = [ dhcpcd ];
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environment.etc =
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[ { source = exitHook;
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target = "dhcpcd.exit-hook";
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}
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];
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powerManagement.resumeCommands =
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''
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# Tell dhcpcd to rebind its interfaces if it's running.
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status="$(${config.system.build.upstart}/sbin/status dhcpcd)"
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[[ "$status" =~ start/running ]] && ${dhcpcd}/sbin/dhcpcd --rebind
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'';
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};
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}
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