package jos.system.net.jeps;

/*
 *  Generic Ethernet Interface
 */

class EthernetNetworkInterface extends NetworkInterface
{

  private ARP arp;
  private NetworkInterfaceCard driver;
  HWAddr hwaddr;

  EthernetNetworkInterface(NetworkInterfaceCard drvr)
  {
    super();
    driver = drvr;
    hasARP = true;		// Ethernet uses ARP
    blocking= true;
    if (!init()) {System.out.println("Not inited!");}
    hwaddr=driver.getHWAddr();
    arp = new ARP(this,hwaddr);		
    addProtocol(arp);
  }

  public boolean init()       
  {
    /* Inits the driver */
    if (driver.init() != 0) {return false;}
    else {return true;}
  } 
  
  public Packet readPacket()
  /*
   * Read Ethernet frame and "unpack" it. Used by super.demux()
   */  
  {
    EtherPacket ep = driver.read();
    Packet p=ep.unpack(ep.HEADER_LEN);
    return p;
  }

  void writePacket(Packet p,HWAddr src, HWAddr dest, int protocol)
  {
    if ((p==null) || (src==null) || (dest==null)) 
      { System.out.println("Null pointer?!?!?! in ENI.writePacket");
//        return;
	}
    if (dest==null) {
      System.out.println("Dest invalid");
      }
    if (src==null) {
      System.out.println("Src invalid");
      }
    EtherPacket ep=new EtherPacket(p.pack(14));
    ep.setSrcDestProt(src,dest,protocol);  
      
/*----------- Test, parse your own packet. Close this comment to activate. *
    try
    {
    EtherPacket eep= new EtherPacket(ep.data);
    System.out.println(">>>"+eep.toString());
    if (eep.protocol==0x800) 
    {
      IPPacket ipp=new IPPacket(eep.unpack(eep.HEADER_LEN));
      System.out.println(">>>"+ipp.toString());
      if (ipp.protocol==0x1)
      {
        ICMPPacket icmpp=new ICMPPacket(ipp.unpack(ipp.HEADER_LEN));
        System.out.println(">>>"+icmpp.toString());
      }
      else if (ipp.protocol==0x11)
      {
        UDPPacket udpp=new UDPPacket(ipp.unpack(ipp.HEADER_LEN));
        System.out.println(">>>"+udpp.toString());
      }
    }
    else if (eep.protocol==0x806)
    {
      ARPPacket arpp=new ARPPacket(eep.unpack(eep.HEADER_LEN).data);
      System.out.println(">>>"+arpp.toString());
    }
    }
    catch (MalformedPacketException e)
    {
        System.out.println("Packet was ****ed up.");
    }
/*---------------  End of testing ---------------------------------        */
    driver.write(ep);
  }  

  void writeIPPacket(IPAddr dest,IPPacket ipp)
  {
    System.out.println("+++"+ipp.toString());
    HWAddr hwdest = arp.getHWAddr(dest);
    if (hwdest!=null)
    {
      writePacket(ipp,hwaddr,arp.getHWAddr(dest),0x800);
      return;
    }
    // Send ARP Request and drop packet. SHOULD NOT be done (RFC 1122)
    // It's inefficient but accepted behaviour.
    arp.request(dest);
  }
}