add student files locally

projects/Assignments/2018JulySeptember/homework1/CainAssignment1.java

+package CainAssignment1;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * changed telnet # from 2317 to 2318. This won't affect the protocol handshake
+ * as long as client inputs the correct telnet #.
+ *
+ * telnet localhost 2318
+ *
+ * ask for the ip address of the server
+ * <code>telnet ipOfServersLaptop 2318</code>
+ */
+public class CainAssignment1 {
+
+    public static void main(String[] args) {
+        try {
+            int popularityCount = 0; // state
+
+            ServerSocket serverSocket = new ServerSocket(2318); // server decides here what port to listen on.
+            // of interest: often client doesn't care what port it uses locally when connecting to that server port.
+
+            // Loop, infinitely, waiting for client connections.
+            // Stop the program somewhere else.
+            while (true) {
+                Socket clientConnection = serverSocket.accept(); // blocks! then proceeds once a connection is "accept"ed
+                
+                /**
+                 * changed connectionCount to popularityCount
+                 */
+                popularityCount++;
+
+                OutputStream os = clientConnection.getOutputStream();
+                PrintStream ps = new PrintStream(os);
+
+                ps.println("This client response was written by server CainAssignment1"); // to remote client
+                System.out.println("This server response was written by server CainAssignment1"); // to server console
+
+                ps.println("You were connection #" + popularityCount + ", by my count");
+
+                // Print some information locally about the Socket
+                // connection. This includes the port and IP numbers
+                // on both sides (the socket pair.)
+                InetAddress localAddress = clientConnection.getLocalAddress();
+                InetAddress remoteAddress = clientConnection.getInetAddress();
+
+                int localPort = clientConnection.getLocalPort();
+                int remotePort = clientConnection.getPort();       // remember the prior question, why are 2 ports different?
+
+                // My socket pair connection looks like this, to localhost:
+                // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 )) note IPv6
+                // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+                System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( "
+                        + remoteAddress.toString() + ", " + remotePort + " ))");
+                System.out.println("you'er server is blowing up! Now serving #" + popularityCount); // report progress
+
+                ps.flush();
+                clientConnection.close();
+            }
+        } catch (Exception e) {
+            /**
+             * added to the println for fun
+             */
+            System.out.println("you got all sorts of problems with your networking: " + e);
+        }
+    }
+}

projects/Assignments/2018JulySeptember/homework1/FriscoTcpClient.java

+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.Socket;
+
+
+import java.io.*;
+import java.net.*;
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author djfrisco
+ */
+public class FriscoTcpClient {
+
+    public static void main(String[] args) 
+    {
+        try
+        {
+           System.out.println("creating socket");
+           
+           // We request an IP to connect to ("localhost") and
+           // port number at that IP (2317). This establishes
+           // a connection to that IP in the form of the Socket
+           // object; the server uses a ServerSocket to wait for
+           // connections.
+           Socket socket = new Socket("localhost", 2317); 
+           
+           // Read the single line written by the server. We'd
+           // do things a bit differently if many lines to be read
+           // from the server, instead of one only.
+           InputStream is = socket.getInputStream();
+           InputStreamReader isr = new InputStreamReader(is);
+           BufferedReader br = new BufferedReader(isr);
+           
+           String serverMessage = br.readLine();
+           System.out.println("1 The message the server sent was " + serverMessage);
+           
+           // Outgoing Messages
+           OutputStream os = socket.getOutputStream();
+           PrintStream ps = new PrintStream(os);
+           ps.println("bbb report: X, Y, X " + System.currentTimeMillis());
+           
+           serverMessage = br.readLine();
+           System.out.println("2 The message the server sent was " + serverMessage);
+           
+           //os = socket.getOutputStream();
+          // ps = new PrintStream(os);
+           ps.println("Final message from client " + System.currentTimeMillis());
+           serverMessage = br.readLine();
+           System.out.println("3 The message the server sent was " + serverMessage);
+            
+           
+        }
+        catch(Exception e)
+        {
+            System.out.println(e);
+            System.out.println("Problem with client");
+        }
+
+    }
+}
+

projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java

+
+package FurrAssignment2;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Very slightly more complex than example1. The only thing this does
+ * differently is introduce a loop into the response, so you don't
+ * have to restart the program after one response. Also, it prints
+ * out the socket pair the server sees. Run the program via telnet
+ * several times and compare the socket pairs.
+ * 
+ * telnet localhost 2317
+ * 
+ * If you're sophisticated you can contact the instructor's computer
+ * while running this program.
+ * 
+ * telnet <ipOfServersLaptop> 2317
+ * 
+ * And have him display the socket pairs he got.
+ * @author mcgredo
+ */
+public class FurrAssignment2 
+{
+
+    public static void main(String[] args) 
+    {
+        try
+        {
+            // ServerSocket waits for a connection from a client. 
+            // Notice that it is outside the loop; ServerSocket
+            // needs to be made only once.
+			
+			int connectionCount = 0; // state
+            for(int i=2317; i<10; i++){
+				ServerSocket serverSocket = new ServerSocket(i);
+				System.out.println("server established for port #" +i);
+			}
+
+            // Loop, infinitely, waiting for client connections.
+            // Stop the program somewhere else.
+            while(true)
+            {
+                Socket clientConnection = serverSocket.accept(); // blocks! then proceeds once a connection is "accept"ed
+				
+				connectionCount++; // got another one!
+				
+                OutputStream os = clientConnection.getOutputStream();
+                PrintStream ps = new PrintStream(os);
+
+				        ps.println("This client response was written by server TcpExample2"); // to remote client
+				System.out.println("This server response was written by server TcpExample2"); // to server console
+                
+                // Print some information locally about the Socket
+                // connection. This includes the port and IP numbers
+                // on both sides (the socket pair.)
+                
+                InetAddress localAddress = clientConnection.getLocalAddress();
+                InetAddress remoteAddress = clientConnection.getInetAddress();
+                
+                int localPort = clientConnection.getLocalPort();
+                int remotePort = clientConnection.getPort();
+                
+                // My socket pair connection looks like this, to localhost:
+                // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
+                // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+                //
+                // Why is the first IP/port the same, while the second set has
+                // different ports?
+
+
+                System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " + 
+                        remoteAddress.toString() + ", " + remotePort + " ))");
+                
+                System.out.println("got another connection, #" + connectionCount); // report progress
+				
+                // Notice the use of flush() and close(). Without
+                // the close() to Socket object may stay open for 
+                // a while after the client has stopped needing this
+                // connection. Close() explicitly ends the connection.
+                ps.flush();
+                clientConnection.close();
+            }
+       }
+        catch(Exception e)
+        {
+            System.out.println("problem with networking: " + e);
+        }
+       
+    }
+    
+}

projects/Assignments/2018JulySeptember/homework2/README.md

+## Homework 2
+
+Deliverables:
+
+0. Think of a simple challenge/response protocol that you wish to portray.
+1. Apply your own customized version of Assignment 3 showing both Server and Client programs.
+2. Include comments describing your modifications.
+3. Include documentation of one or more sessions, including operation.
+4. Create a simple illustration of the communications exchange in a UML Sequence Diagram.
+
+Please see the [README.md](../../README.md) in the Assignments directory for detailed instructions.
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