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204 lines (185 loc) · 6.49 KB
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///////////////////////////////////////////////////////////////////
// Student name: Corey McCandless
// Course: COSC 4653 - Advanced Networks
// Assignment: #3 - Mobile IP Simulation
// File name: FrameHandler.java
// Program's Purpose: Defines FrameHandler class
//
// Program's Limitations:
// Development Computer: Lenovo Y400 (Intel Core i7-3630QM)
// Operating System: Windows 8.1
// Integrated Development Environment (IDE): Notepad++
// Compiler: Java 1.8.0_25
// Program's Operational Status: Awaiting Testing
///////////////////////////////////////////////////////////////////
import java.io.*;
import java.lang.*;
import java.net.*;
import java.nio.*;
import java.util.*;
public abstract class FrameHandler {
private static final boolean DEBUG = false;
public static final int MOBILE_PORT = 9000;
public static final int FOREIGN_PORT = 8000;
public static final int HOME_PORT = 7000;
public static final int CORRESPONDENT_PORT = 6000;
public static final int MAX_MSG_SIZE = 52;
// Used for creating a new instance of Frame.
public static Frame create(int type, String ipAddrA, String ipAddrB, String msg) {
byte[] data=new byte[MAX_MSG_SIZE+12];
int msgLen=(msg.length()>MAX_MSG_SIZE?MAX_MSG_SIZE:msg.length());
for (int i=0;i<(msgLen>4?msgLen:4);i++) {
if (i<4) {
data[i]=ByteBuffer.allocate(4).putInt(type).array()[i];
try {
if (ipAddrA!="") data[i+4]=InetAddress.getByName(ipAddrA).getAddress()[i];
if (ipAddrB!="") data[i+8]=InetAddress.getByName(ipAddrB).getAddress()[i];
} catch(UnknownHostException e) {
e.printStackTrace();
return null;
} // try
} // if
if (msg!="") data[i+12]=msg.getBytes()[i];
} // for
return new Frame(data);
} // create(int,String,String,String)
// Returns the Frame's data as a byte array
public static byte[] getData(Frame frame) {
return frame.data;
} // getData(Frame)
// Sets the Frame's type
public static void setType(Frame frame,int type) {
for (int i=0;i<4;i++)
frame.data[i]=ByteBuffer.allocate(4).putInt(type).array()[i];
} // setType(Frame,int)
// Returns Frame's type as an integer
public static int getType(Frame frame) {
return (frame.data[0]<<24) + (frame.data[1]<<16) + (frame.data[2]<<8) + frame.data[3];
} // getType(Frame)
// Sets Frame's IP Address A
public static void setIpAddrA(Frame frame,String ipAddr) {
try {
for (int i=0;i<4;i++)
frame.data[i+4]=InetAddress.getByName(ipAddr).getAddress()[i];
} catch (UnknownHostException e) {
e.printStackTrace();
return;
} // try
} // setIpAddrA(Frame,String)
// Returns IP Address A as a String
public static String getIpAddrA(Frame frame) {
String result = "";
try {
result=InetAddress.getByAddress(Arrays.copyOfRange(frame.data,4,8)).getHostName();
} catch (UnknownHostException e) {
e.printStackTrace();
return null;
} // try
return result;
} // getIpAddrA(Frame)
// Sets Frame's IP Address B
public static void setIpAddrB(Frame frame, String ipAddr) {
try {
for (int i=0;i<4;i++)
frame.data[i+8]=InetAddress.getByName(ipAddr).getAddress()[i];
} catch (UnknownHostException e) {
e.printStackTrace();
return;
} //try
} // setIpAddrB(Frame,String)
// Returns IP Address B as a String
public static String getIpAddrB(Frame frame) {
String result="";
try {
result=InetAddress.getByAddress(Arrays.copyOfRange(frame.data,8,12)).getHostName();
} catch (UnknownHostException e) {
e.printStackTrace();
return null;
} // try
return result;
} // getIpAddrB(Frame)
// Sets String message contained in Frame
public static void setMsg(Frame frame, String msg) {
for (int i=0;i<(msg.length()>MAX_MSG_SIZE?MAX_MSG_SIZE:msg.length());i++)
frame.data[i+12]=msg.getBytes()[i];
} // setMsg(Frame,String)
// Returns String message contained in Frame
public static String getMsg(Frame frame) {
String result = "";
try {
result=new String(Arrays.copyOfRange(frame.data,12,MAX_MSG_SIZE+12),"UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} // try
return result;
} // getMsg(Frame)
// Method for sending a frame via UDP
public static void send(DatagramSocket socket, String toAddr, int port, Frame frame) {
DatagramPacket packet=null;
if (toAddr=="") {
return;
} // if
try {
packet = new DatagramPacket(frame.data,MAX_MSG_SIZE+12,InetAddress.getByName(toAddr),port);
} catch (UnknownHostException e) {
e.printStackTrace();
System.out.println(toAddr + " is a bad address");
return;
} // try
try {
socket.send(packet);
} catch (Exception e) {
e.printStackTrace();
} // try
debugPrint(String.format("MSG_SENT: %s:%d\n %d %s %s",packet.getAddress(),packet.getPort(),getType(frame),getIpAddrA(frame),getIpAddrB(frame)));
} // send(DatagramSocket,String,int,Frame)
// Static method for sending data not yet organized into a frame via UDP
public static void send(DatagramSocket socket, String toAddr, int port, int type, String ipAddrA, String ipAddrB, String msg) {
send(socket,toAddr,port,create(type,ipAddrA,ipAddrB,msg));
} // send(DatagramSocket,String,int,int,String,String,String)
// Static method for receiving UDP datagram. Returns an instance of Frame
public static Frame recv(DatagramSocket socket,DatagramPacket packet) {
return recv(socket,packet,"");
} // recv(DatagramSocket,DatagramPacket)
// Static method for receiving UDP datagram with optional "waiting" characters
public static Frame recv(DatagramSocket socket,DatagramPacket packet, String waitChars) {
boolean timeout=false;
Frame result = null;
if (packet==null) packet = new DatagramPacket(new byte[64],64);
if (socket==null) return null;
try {
timeout=socket.getSoTimeout()>0;
} catch (SocketException e) {
e.printStackTrace();
System.exit(0);
} // try
if (timeout) {
while (true) {
try {
socket.receive(packet);
} catch (SocketTimeoutException e) {
System.out.print(waitChars);
continue;
}catch (Exception e) {
e.printStackTrace();
return null;
} // try
break;
} // while
System.out.println("");
} else {
try {
socket.receive(packet);
} catch (Exception e) {
e.printStackTrace();
return null;
} // try
} // if
result = new Frame(packet.getData());
debugPrint(String.format("MSG_RECVD: %s:%d\n %d %s %s",packet.getAddress(),packet.getPort(),getType(result),getIpAddrA(result),getIpAddrB(result)));
return result;
} // recv(DatagramSocket)
private static void debugPrint(String msg) {
if (DEBUG) System.out.println(msg);
} // debugPrint(String)
} // class