Openwrt/openwrt/target/default/target_skeleton/sbin/ifup

#!/bin/ash
. /etc/functions.sh
  type=$1
  debug "### ifup $type ###"

  if=$(nvram get ${type}_ifname)
  if [ "${if%%[0-9]}" = "ppp" ]; then
    if=$(nvram get pppoe_ifname)
  fi

  if_valid $if || return

  $DEBUG ifconfig $if down
  if [ "${if%%[0-9]}" = "br" ]; then
    stp=$(nvram get ${type}_stp)
    $DEBUG brctl delbr $if
    $DEBUG brctl addbr $if
    $DEBUG brctl setfd $if 0
    $DEBUG brctl stp $if ${stp:-0}
    for sif in $(nvram get ${type}_ifnames); do {
      if_valid $sif || continue
      $DEBUG ifconfig $sif 0.0.0.0 up
      $DEBUG brctl addif $if $sif
    } done
  fi

  mac=$(nvram get ${type}_hwaddr)
  ${mac:+$DEBUG ifconfig $if hw ether $mac}

  if_proto=$(nvram get ${type}_proto)
  case "$if_proto" in
    static)
      ip=$(nvram get ${type}_ipaddr)
      netmask=$(nvram get ${type}_netmask)
      gateway=$(nvram get ${type}_gateway)

      $DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} broadcast + up
      ${gateway:+$DEBUG route add default gw $gateway}

      [ -f /etc/resolv.conf ] && return

      debug "# --- creating /etc/resolv.conf ---"
      for dns in $(nvram get ${type}_dns); do {
	echo "nameserver $dns" >> /etc/resolv.conf
      } done
    ;;
    dhcp)
      ip=$(nvram get ${type}_ipaddr)
      pidfile=/tmp/dhcp-${type}.pid
      if [ -f $pidfile ]; then
        $DEBUG kill $(cat $pidfile)
      fi
      ${DEBUG:-eval} "udhcpc -i $if ${ip:+-r $ip} -b -p $pidfile &" 
    ;;
    pppoe)
	# handled by /etc/init.d/S50pppoe
    ;;
    none)
    ;;
    *)
      echo "### WARNING $if: $if_proto is not supported"
    ;;
  esac