Merge branch 'master' of https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500

assignments/ReportingForDuty.md

@@ -8,13 +8,14 @@ More information on your use of Git is in the parent directory [README.md](../..
 
 - Don Brutzman
 
-- Brian Pugh
-
 ---
+
 ### 2021
 
 - Terry is here!
 
+- Brian Pugh
+
 - Kurt Reynolds
 
 - Rick Lentz
@@ -35,6 +36,8 @@ More information on your use of Git is in the parent directory [README.md](../..
 
 - John Allen
 
+---
+
 ### 2020
 
 - Bernd Weissenberger

assignments/src/MV3500Cohort2021JulySeptember/homework1/McNeelyTCPExample2.java

+package MV3500Cohort2021JulySeptember.homework1;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * 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.
+ * 
+ * <code>telnet localhost 2317</code>
+ * 
+ * If you're sophisticated you can contact the instructor's computer
+ * while running this program.
+ * 
+ * <code>telnet ipOfServersLaptop 2317</code>
+ * 
+ * And have that machine display the socket pairs received.
+ * @author mcgredo
+ * @author brutzman
+ * @author McNeely
+ */
+public class McNeelyTCPExample2
+{
+ public static void main(String[] args)
+    {
+        try
+        {
+            System.out.println("Justin McNeely's TcpExample2 has started and is waiting for a connection...");
+            System.out.println("  help: https://savage.nps.edu/Savage/developers.html#telnet");
+            System.out.println("  enter (nc localhost 2317) or (telnet localhost 2317) to win..." );
+			
+            // 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 variable
+            int totalEntrantCount = 31; // spoofed entrants
+            
+            ServerSocket serverSocket = new ServerSocket(2317); // 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)
+            {
+                // blocks! then proceeds once a connection is "accept"ed
+                try (Socket clientConnection = serverSocket.accept()) {
+                    connectionCount++; // got another one!
+                    
+                    OutputStream os = clientConnection.getOutputStream();
+                    PrintStream ps = new PrintStream(os);
+                    
+                    ps.println("This client response was written by server " + McNeelyTCPExample2.class.getName()); // to remote client
+                    System.out.println("This server response was written by server " + McNeelyTCPExample2.class.getName()); // to server console
+                    
+                            ps.println("You have attempted " + connectionCount + "times, you are now aplicant number " + totalEntrantCount + " to win. Keep trying!");
+                    
+                    totalEntrantCount = (totalEntrantCount + 24);
+                    // 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 ))
+                    //
+                    // Why is 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! WINNING!, #" + 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();
+                }
+            }
+       }
+        catch(IOException e)
+        {
+            System.err.println("Problem with  " + McNeelyTCPExample2.class.getName() + " networking:"); // describe what is happening
+            System.err.println("Error: " + e);
+            // Provide more helpful information to user if exception occurs due to running twice at one time
+            if (e instanceof java.net.BindException)
+                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+        }
+    }
+    
+}

assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting

+package MV3500Cohort2021JulySeptember.homework1.Pugh;
+
+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.
+ *
+ * <code>telnet localhost 2317</code>
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * <code>telnet ipOfServersLaptop 2317</code>
+ *
+ * And have that machine display the socket pairs received.
+ *
+ * @author pugh
+ * @author brutzman
+ */
+public class PughTcp2ConnectionCounting {
+
+    /**
+     * Program invocation, execution starts here
+     *
+     * @param args command-line arguments
+     */
+    public static void main(String[] args) {
+        try {
+            System.out.println("TcpExample2ConnectionCounting has started and is waiting for a connection.");
+            System.out.println("Get Ready To Network!!!");
+            System.out.println("  help: https://savage.nps.edu/Savage/developers.html#telnet");
+            System.out.println("  enter (nc localhost 2317) or (telnet localhost 2317)...");
+
+            // 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 variable
+
+            ServerSocket serverSocket = new ServerSocket(2317); // 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) {
+                // blocks! then proceeds once a connection is "accept"ed
+                try ( Socket clientConnection = serverSocket.accept()) {
+                    connectionCount++; // got another one!
+
+                    OutputStream os = clientConnection.getOutputStream();
+                    PrintStream ps = new PrintStream(os);
+
+                    ps.println("This client response was written by server " + PughTcp2ConnectionCounting.class.getName()); // to remote client
+                    System.out.println("This server response was written by server " + PughTcp2ConnectionCounting.class.getName() + "\n"); // to server console
+                    if (connectionCount % 2 == 1) {
+                        System.out.println("Go\n");
+                    }
+                    if (connectionCount % 2 == 0) {
+                        System.out.println("Gators!\n");
+                    }
+                    if (connectionCount % 3 == 1 && connectionCount != 0) {
+                        System.out.println("O'Doyle Rules!!! \n");
+                    }
+                    ps.println("You were connection #" + connectionCount + ", 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 ))
+                    //
+                    // Why is 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();
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("Problem with  " + PughTcp2ConnectionCounting.class.getName() + " networking:"); // describe what is happening
+            System.err.println("Error: " + e);
+            // Provide more helpful information to user if exception occurs due to running twice at one time
+            if (e instanceof java.net.BindException) {
+                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+            }
+        }
+    }
+}

assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting.java

+package MV3500Cohort2021JulySeptember.homework1.Pugh;
+
+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.
+ *
+ * <code>telnet localhost 2317</code>
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * <code>telnet ipOfServersLaptop 2317</code>
+ *
+ * And have that machine display the socket pairs received.
+ *
+ * @author pugh
+ * @author brutzman
+ */
+public class PughTcp2ConnectionCounting {
+
+    /**
+     * Program invocation, execution starts here
+     *
+     * @param args command-line arguments
+     */
+    public static void main(String[] args) {
+        try {
+            System.out.println("TcpExample2ConnectionCounting has started and is waiting for a connection.");
+            System.out.println("Get Ready To Network!!!");
+            System.out.println("  help: https://savage.nps.edu/Savage/developers.html#telnet");
+            System.out.println("  enter (nc localhost 2317) or (telnet localhost 2317)...");
+
+            // 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 variable
+
+            ServerSocket serverSocket = new ServerSocket(2317); // 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) {
+                // blocks! then proceeds once a connection is "accept"ed
+                try ( Socket clientConnection = serverSocket.accept()) {
+                    connectionCount++; // got another one!
+
+                    OutputStream os = clientConnection.getOutputStream();
+                    PrintStream ps = new PrintStream(os);
+
+                    ps.println("This client response was written by server " + PughTcp2ConnectionCounting.class.getName()); // to remote client
+                    System.out.println("This server response was written by server " + PughTcp2ConnectionCounting.class.getName() + "\n"); // to server console
+                    if (connectionCount % 2 == 1) {
+                        System.out.println("Go\n");
+                    }
+                    if (connectionCount % 2 == 0) {
+                        System.out.println("Gators!\n");
+                    }
+                    if (connectionCount % 3 == 1 && connectionCount != 0) {
+                        System.out.println("O'Doyle Rules!!! \n");
+                    }
+                    ps.println("You were connection #" + connectionCount + ", 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 ))
+                    //
+                    // Why is 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();
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("Problem with  " + PughTcp2ConnectionCounting.class.getName() + " networking:"); // describe what is happening
+            System.err.println("Error: " + e);
+            // Provide more helpful information to user if exception occurs due to running twice at one time
+            if (e instanceof java.net.BindException) {
+                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+            }
+        }
+    }
+}

assignments/src/MV3500Cohort2021JulySeptember/homework1/SchlesselTcpExample1Telnet.java

+package TcpExamples;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Homework 1
+ * 
+ * @author max schlessel
+ */
+public class SchlesselTcpExample1Telnet 
+{
+    /**
+     * Program invocation, execution starts here
+     * @param args command-line arguments
+     */
+    public static void main(String[] args)
+    {
+        try
+        {
+            System.out.println(SchlesselTcpExample1Telnet.class.getName() + " has started and is waiting for a connection.");
+            System.out.println("  help: https://savage.nps.edu/Savage/developers.html#telnet");
+            System.out.println("  enter (telnet localhost 2317) or (nc localhost 2317)..." );
+			
+            // The ServerSocket waits for a connection from a client.
+            // It returns a Socket object when the connection occurs.
+            ServerSocket serverSocket = new ServerSocket(2317);
+            
+            // Use Java io classes to write text (as opposed to
+            // unknown bytes of some sort) to the client
+            
+            // The Socket object represents the connection between
+            // the server and client, including a full duplex connection
+            try (Socket clientConnection = serverSocket.accept()) // wait here for a client to connect
+            {
+                // OK we got something, time to respond!
+                // Use Java io classes to write text (as opposed to
+                // unknown bytes of some sort) to the client
+                OutputStream os = clientConnection.getOutputStream();
+                PrintStream ps = new PrintStream(os);
+                
+                        ps.println("This client response was written by Max's client " + SchlesselTcpExample1Telnet.class.getName()); // to remote client
+                        ps.println("aka the shot heard round the world");
+                System.out.println("This server response was written by Max's server " + SchlesselTcpExample1Telnet.class.getName()); // to server console
+                System.out.println("boom");
+
+                // "flush()" in important in that it forces a write
+                // across what is in fact a slow connection
+                ps.flush();
+            }
+            System.out.println(SchlesselTcpExample1Telnet.class.getName() + " completed successfully.");
+        }
+        catch(IOException e)
+        {
+            System.err.println("Exception with " + SchlesselTcpExample1Telnet.class.getName() + " networking:"); // describe what is happening
+            System.err.println(e);
+            // Provide more helpful information to user if exception occurs due to running twice at one time
+            
+            // brute force exception checking, can be brittle if exception message changes
+            // if (e.getMessage().equals("Address already in use: NET_Bind")) 
+            if (e instanceof java.net.BindException)
+                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+        }
+    }
+}