Merge origin/master

assignments/ReportingForDuty.md

@@ -7,27 +7,27 @@ Be sure to *git update* before, and be sure to *git commit* and *git push* after
 More information on your use of Git is in the parent directory [README.md](../../README.md)
 
 - Don Brutzman
-
 ---
-
 ### 2021
 
+- Terry is here!
+
 - Kurt Reynolds
 
 - Rick Lentz
 
-- Dom Hittner
-
 - Nick Hittner
 
 - Matt Robinson
 
 - Alex Fisher
 
---John Morris
+- John Morris
 
 - Max Schlessel
 
+- Justin McNeely
+
 ### 2020
 
 - Bernd Weissenberger

assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java

-package MV3500Cohort2021JulySeptember.homework1;
-
-
-import java.io.IOException;
-import java.io.OutputStream;
-import java.io.PrintStream;
-import java.net.ServerSocket;
-import java.net.Socket;
-
-/**
- *
- * @author adfis
- */
-
-
-public class FisherTCPExample1Telnet {
-    public static void main(String[] args) 
-    {
-        try
-        {
-            System.out.println("TcpExample1Telnet 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()) {
-                // 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("Client response was written by Alex' server TcpExample1."); // to remote clientnc
-                ps.println("We are crushing this assignment, good work.");
-                System.out.println("Server response was written by Alex' server TcpExample1."); // to server console
-                System.out.println("SUCCESS!");
-
-                // "flush()" in important in that it forces a write
-                // across what is in fact a slow connection
-                ps.flush();
-            }
-            System.out.println("TcpExample1 completed successfully.");
-        }
-        catch(IOException e)
-        {
-            System.err.println("Problem with TcpExample1Telnet 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
-            
-            // 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!");
-        }
-    }
-}
-
+package MV3500Cohort2021JulySeptember.homework1;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ *
+ * @author adfis
+ */
+
+
+public class FisherTCPExample1Telnet {
+    public static void main(String[] args) 
+    {
+        try
+        {
+            System.out.println("TcpExample1Telnet 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()) {
+                // 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("Client response was written by Alex' server TcpExample1."); // to remote clientnc
+                ps.println("We are crushing this assignment, good work.");
+                System.out.println("Server response was written by Alex' server TcpExample1."); // to server console
+                System.out.println("SUCCESS!");
+
+                // "flush()" in important in that it forces a write
+                // across what is in fact a slow connection
+                ps.flush();
+            }
+            System.out.println("TcpExample1 completed successfully.");
+        }
+        catch(IOException e)
+        {
+            System.err.println("Problem with FisherTCPExample1Telnet 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
+            
+            // 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!");
+        }
+    }
+}
+

assignments/src/MV3500Cohort2021JulySeptember/homework1/HittnerNickTcpExample1Telnet.java

+package MV3500Cohort2021JulySeptember.homework1;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ *
+ * @author adfis
+ */
+
+
+public class HittnerNickTcpExample1Telnet {
+    public static void main(String[] args) 
+    {
+        try
+        {
+            System.out.println("TcpExample1Telnet 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()) {
+                // 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("Client response was brought to you by the Highlander"); // to remote clientnc
+                ps.println("There Can Be Only One");
+                System.out.println("Client response was brought to you by the Highlander"); // to server console
+                System.out.println("There Can be Only One");
+
+                // "flush()" in important in that it forces a write
+                // across what is in fact a slow connection
+                ps.flush();
+            }
+            System.out.println("TcpExample1 completed successfully.");
+        }
+        catch(IOException e)
+        {
+            System.err.println("Problem with TcpExample1Telnet 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
+            
+            // 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!");
+        }
+    }
+}

assignments/src/MV3500Cohort2021JulySeptember/homework1/LeckieTcpExample2.java

+package pkg3500.leckie;
+
+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 leckie
+ */
+public class LeckieTcpExample2 
+{
+ public static void main(String[] args)
+    {
+        try
+        {
+            System.out.println("TcpExample2ConnectionCounting 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)..." );
+			
+            // 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 " + LeckieTcpExample2.class.getName()); // to remote client
+                    System.out.println("This server response was written by server " + LeckieTcpExample2.class.getName()); // to server console
+                    
+                            ps.println("This is your lottery attempt number #" + connectionCount + ", you are aplicant number " + totalEntrantCount + " to try and win. Keep trying!");
+                    
+                    totalEntrantCount = (totalEntrantCount + 79);
+                    // 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  " + LeckieTcpExample2.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/TcpExample2_Leckie_Mod_Hw1.java

+package pkg3500.leckie;
+
+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 leckie
+ */
+public class TcpExample2_Leckie_Mod_Hw1 
+{
+ public static void main(String[] args)
+    {
+        try
+        {
+            System.out.println("TcpExample2ConnectionCounting 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)..." );
+			
+            // 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 " + TcpExample2_Leckie_Mod_Hw1.class.getName()); // to remote client
+                    System.out.println("This server response was written by server " + TcpExample2_Leckie_Mod_Hw1.class.getName()); // to server console
+                    
+                            ps.println("This is your lottery attempt number #" + connectionCount + ", you are aplicant number " + totalEntrantCount + " to try and win. Keep trying!");
+                    
+                    totalEntrantCount = (totalEntrantCount + 79);
+                    // 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  " + TcpExample2_Leckie_Mod_Hw1.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!");
+        }
+    }
+    
+}