s isVpn = false
java(nis,null,"java.net.NetworkInterface.getNetworkInterfaces")
f(nis != null){
  java(list,null,"java.util.Collections.list","java.util.Enumeration",nis)
  for(ni;list){
    java(up,ni,"java.net.NetworkInterface.isUp")
    java(ia,ni,"java.net.NetworkInterface.getInterfaceAddresses")
    java(size,ia,"java.util.List.size")
    f(up && size != 0){
      java(name,ni,"java.net.NetworkInterface.getName")
      f(name == "tun0" || name == "ppp0"){
        s isVpn = true
        break
        }
      }
    }
  }
f(isVpn==true)
{
  syso("有抓包")
  tw("网络错误")
  end()
  endcode
}
else
{
  syso("没有抓包")
}