package jos.system.net.jeps;

/*
 * Internet Control Message Protocol implementation.
 */

class ICMP extends Protocol
{
  private IP ip;

  ICMP(IP ip)
  {
    protocolNumber=0x1;
    next=null;
    this.ip=ip;
  }

  public void Handle(Packet p)
  {
    ICMPPacket icmpp = null;
    try {icmpp=new ICMPPacket(p);}
    catch (MalformedPacketException e) { return;}  // Drop silently as per RFC 1122
    System.out.println("ICMP  "+icmpp.toString());
    if (icmpp.type==icmpp.TYPE_ECHORQ)
    {
      ICMPPacket rp = icmpp.reply();
      IPAddr dest=((IPPacket)icmpp.wrapper).src;
      System.out.println("REP "+rp.toString());
      try {ip.send(dest,rp);}
      catch (NoRouteException e) {}  
    }
  }
  
/*  public void sendICMP(int type,IPAddr dest)
  {
    ICMPPacket icmpp = new ICMPPacket();
    icmpp.data = new byte[60];		// Compute based on type/code
    icmpp.type=type;
  }*/
  
  public void ping(IPAddr dest)
  {
    ICMPPacket icmpp = new ICMPPacket();
    icmpp.data = new byte[60];		// Compute based on type/code
    icmpp.type=(byte)8;
    icmpp.code=0;
    icmpp.msg_id=1000;
    icmpp.seq_nr=1;
    icmpp.update();
    try {ip.send(dest,icmpp);}
      catch (NoRouteException e) {}  
  }
};