Errorsimulator - )[email protected]@version 1.00...

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/** * @(#) * * * @author * @version 1.00 2009/8/2 */ import*; import*; import java.util.*; public class Errorsimulator implements Runnable { p DatagramPacket receivePacket,sendPacket,tempPacket, wrongPacket; DatagramSocket listningSocket,sendingSocket,unknownSocket; BufferedReader errorChoice,packetType,errorBlock,theTID, theRequest; private int count = 3; private boolean wrongTid = false; private boolean wrongRequest = false; byte [] bufError; String receivedOpcode ,changedOpcode; S //these are the string for error that is requested //containing type of error,type of packet and block No String error,dataAck,blockNo, packetData,TID, RequestE; S int serverPort, changedPort; int delay,clientPort; InetAddress clientAddress,serverAddress; // this array will contain the message from received packet byte request [] = new byte [512]; byte [] ACK ; //constructore creates sockets public Errorsimulator(){ //receives the packets try{ listningSocket = new DatagramSocket(68); }catch(SocketException e){ System.err.println(e); } //sends packets try{ sendingSocket = new DatagramSocket(); }catch(SocketException e){ System.err.println(e); S } //this is for sending packets from unknown source try{ unknownSocket = new DatagramSocket(); }catch(SocketException e){ System.err.println(e); } } public void run(){ p //get instruction for error
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checkRequest(); //packet created receivePacket = new DatagramPacket(request,request.length); r //receiveing socket try{ listningSocket.receive(receivePacket); }catch(IOException e){ System.out.println(e); S } System.out.println("received packet from client"); S //extract data from packet request = receivePacket.getData(); //change bytes to string String received = new String(request); //get the first two bytes that contain opcode receivedOpcode = new String(received.substring(0,2)); clientPort = receivePacket.getPort(); clientAddress = receivePacket.getAddress(); if(receivedOpcode.equalsIgnoreCase("01")){ System.out.println("The opcode is "+receivedOpcode); System.out.println("This is RRQ"); }else if(receivedOpcode.equalsIgnoreCase("02")){ System.out.println("The opcode is "+receivedOpcode);
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This note was uploaded on 09/26/2009 for the course SCE Sysc3303 taught by Professor Marshall during the Summer '09 term at Carleton CA.

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Errorsimulator - )[email protected]@version 1.00...

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