nixpkgs-suyu/modules/tasks/network-interfaces.nix

{pkgs, config, ...}:

###### implementation

let

  inherit (pkgs) nettools wirelesstools bash writeText;

  cfg = config.networking;

  # !!! use XML
  names = map (i: i.name) cfg.interfaces;
  ipAddresses = map (i: if i ? ipAddress then i.ipAddress else "dhcp") cfg.interfaces;
  subnetMasks = map (i: if i ? subnetMask then i.subnetMask else "default") cfg.interfaces;
  essids = map (i: if i ? essid then i.essid else "default") cfg.interfaces;
  wepKeys = map (i: if i ? wepKey then i.wepKey else "nokey") cfg.interfaces;
  modprobe = config.system.sbin.modprobe;

in 


{
  services = {
    extraJobs = [{
        name = "network-interfaces";
        
        job = ''
          start on udev
          stop on shutdown
          
          start script
              export PATH=${modprobe}/sbin:$PATH
              modprobe af_packet || true
          
              for i in $(cd /sys/class/net && ls -d *); do
                  echo "Bringing up network device $i..."
                  ${nettools}/sbin/ifconfig $i up || true
              done
          
              # Configure the manually specified interfaces.
              names=(${toString names})
              ipAddresses=(${toString ipAddresses})
              subnetMasks=(${toString subnetMasks})
              essids=(${toString essids})
              wepKeys=(${toString wepKeys})
          
              for ((n = 0; n < ''${#names[*]}; n++)); do
                  name=''${names[$n]}
                  ipAddress=''${ipAddresses[$n]}
                  subnetMask=''${subnetMasks[$n]}
                  essid=''${essids[$n]}
                  wepKey=''${wepKeys[$n]}
          
                  # Set wireless networking stuff.
                  if test "$essid" != default; then
                      ${wirelesstools}/sbin/iwconfig "$name" essid "$essid" || true
                  fi
          
                  if test "$wepKey" != nokey; then
                      ${wirelesstools}/sbin/iwconfig "$name" key "$(cat "$wepKey")" || true
                  fi
          
                  # Set IP address / netmask.        
                  if test "$ipAddress" != dhcp; then
                      echo "Configuring interface $name..."
                      extraFlags=
                      if test "$subnetMask" != default; then
                          extraFlags="$extraFlags netmask $subnetMask"
                      fi
                      ${nettools}/sbin/ifconfig "$name" "$ipAddress" $extraFlags || true
                  fi
          
              done
          
              # Set the nameservers.
              if test -n "${toString cfg.nameservers}"; then
                  rm -f /etc/resolv.conf
                  if test -n "${cfg.domain}"; then
                      echo "domain ${cfg.domain}" >> /etc/resolv.conf
                  fi
                  for i in ${toString cfg.nameservers}; do
                      echo "nameserver $i" >> /etc/resolv.conf
                  done
              fi
          
              # Set the default gateway.
              if test -n "${cfg.defaultGateway}"; then
                  ${nettools}/sbin/route add default gw "${cfg.defaultGateway}" || true
              fi
          
              # Run any user-specified commands.
              ${bash}/bin/sh ${writeText "local-net-cmds" cfg.localCommands} || true
          
          end script
          
          # Hack: Upstart doesn't yet support what we want: a service that
          # doesn't have a running process associated with it.
          respawn sleep 100000
          
          stop script
              for i in $(cd /sys/class/net && ls -d *); do
                  echo "Taking down network device $i..."
                  ${nettools}/sbin/ifconfig $i down || true
              done
          end script
        '';
    }];
  };
}