diff --git a/assignments/src/MV3500Cohort2022MayJune/README.md b/assignments/src/MV3500Cohort2022MayJune/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..5bfc1c671e8dcd39f0bda48752f6c1e334c2f623
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/README.md
@@ -0,0 +1,10 @@
+## Student assignments: homework submission directories
+
+* [Homework 1 README](homework1/README.md) Netbeans, Wireshark, Telnet
+* [Homework 2 README](homework2/README.md) Client=Server Socket Connectons
+* [Homework 3 README](homework3/README.md) Example Simulation Program
+* [Homework 4 README](homework4/README.md) DIS Protocol Assesment
+* [Projects README](projects/README.md) Freeplay Opportunities
+
+Please see the [README.md](../../../README.md) in the parent
+[assignments](../../../../assignments) directory for detailed instructions.
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/AllenTcpExample1Telnet1.java b/assignments/src/MV3500Cohort2022MayJune/homework1/AllenTcpExample1Telnet1.java
new file mode 100644
index 0000000000000000000000000000000000000000..2f3717e501458917d7676ac19ac8cbe4ae380e8a
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/AllenTcpExample1Telnet1.java
@@ -0,0 +1,92 @@
+package MV3500Cohort2021JulySeptember.homework1;;
+
+import java.io.*;
+import java.net.*;
+import java.io.*;
+import java.net.*;
+import java.io.*;
+import java.net.*;
+import java.io.*;
+import java.net.*;
+
+/**
+ * The simplest possible TCP network program. It listens for
+ * a connection, from telnet (telnet localhost 2317) or a program
+ * you write, which we will do later. Right now the TcpExample simply
+ * writes a string in response to a connection.
+ *
+ * Modifying his program is the basis for Assignment 1.
+ *
+ * Testing the running server program from telnet looks like this:
+ *
+ * it154916:projects mcgredo$ telnet localhost 2317
+ * Trying ::1...
+ * Connected to localhost.
+ * Escape character is '^]'.
+ * This was written by the server
+ * Connection closed by foreign host.
+ *
+ * Notice that "This was written by the server" matches
+ * what is written by the code below, over the output stream.
+ *
+ * After this first connection the program below drops out
+ * the bottom of the program, and does not repeat itself.
+ * The program exits.
+ *
+ * @author mcgredo
+ * @author brutzman
+ */
+public class AllenTcpExample1Telnet1
+{
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ 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()) // 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 John Allen "); // to remote client
+ ps.println("MOVES 2021 Cohort is well described by Johnny Smiles.");
+ System.out.println("This server response was written by John Allen " ); // to server console
+
+ // "flush()" in important in that it forces a write
+ // across what is in fact a slow connection
+ ps.flush();
+ }
+ System.out.println(" completed successfully.");
+ }
+ catch(IOException e)
+ {
+ System.err.println(" Pardon the interruption, networking issue"); // 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!");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/FisherTCPExample1Telnet.java b/assignments/src/MV3500Cohort2022MayJune/homework1/FisherTCPExample1Telnet.java
new file mode 100644
index 0000000000000000000000000000000000000000..7655001e8d8590e042bd417cbc6cedcdac99d327
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/FisherTCPExample1Telnet.java
@@ -0,0 +1,67 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * homework assignment
+ * @author adfis
+ */
+
+
+public class FisherTCPExample1Telnet
+{
+ /** run the program
+ * @param args command-line arguments, string parameters (unused) */
+ 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("FisherTCPExample1 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!");
+ }
+ }
+}
+
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Client.java b/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..5088e75c61f912125aa12dc551e210cce13cf562
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Client.java
@@ -0,0 +1,90 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.net.Socket;
+
+/**
+ * homework assignment
+ * @author justi
+ */
+public class FrankTCPExample3Client {
+
+ /** IPv6 default */
+ public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
+
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ public static void main(String[] args)
+ {
+ // Local variables/fields
+ Socket socket = null;
+ InputStream is;
+ Reader isr;
+ BufferedReader br;
+ String serverMessage;
+ int clientLoopCount = 0;
+
+ try {
+ while (true) {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(FrankTCPExample3Client.class.getName() + " 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 a Socket
+ // object; the server uses a ServerSocket to wait for
+ // connections.
+ socket = new Socket(LOCALHOST, 2318); // locohost?
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ is = socket.getInputStream();
+ isr = new InputStreamReader(is);
+ br = new BufferedReader(isr);
+
+ // Read a single line written by the server. We'd
+ // do things a bit differently if there were many lines to be read
+ // from the server instead of one only.
+ serverMessage = br.readLine();
+ System.out.println("==================================================");
+
+ System.out.print("Client loop " + clientLoopCount + ": ");
+ System.out.println("now we're talking!");
+ System.out.println("The message the server sent was: '" + serverMessage + "'");
+ // socket gets closed, either automatically/silently by this code (or possibly by the server)
+ if (serverMessage.equals("this is good bye message from the server")) { //if client recieved termanation message stop client
+ break;
+ }
+ Thread.sleep(1000); // turned it down to 1 second
+
+ } // end while(true) // infinite loops are dangerous, be sure to kill this process!
+ }
+ catch (IOException | InterruptedException e)
+ {
+ System.err.println("Problem with " + FrankTCPExample3Client.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!");
+ }
+ } finally // occurs after any other activity when shutting down
+ {
+ try {
+ if (socket != null) {
+ socket.close();
+ }
+ } catch (IOException e) {
+ }
+
+ // program exit: tell somebody about that happening. Likely cause: server drops connection.
+ System.out.println();
+ System.out.println("FrankTCPExample3Client.class.getName() + exit");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Server.JPG b/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Server.JPG
new file mode 100644
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diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Server.java b/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..4f2f56382d86421fa3a0dca356e9996ed4f8ba23
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3Server.java
@@ -0,0 +1,108 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Very slightly more complex than example1, further modifying example2. 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 (nc) localhost 2318
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @author mcgredo
+ * @author brutzman
+ */
+public class FrankTCPExample3Server {
+
+ /**
+ * Program invocation, execution starts here If already compiled, can run
+ * using console in directory ../../build/classes/ by invoking \ java
+ * -classpath . TcpExamples.TcpExample3Server
+ *
+ * @param args command-line arguments
+ */
+ 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.
+ System.out.println(FrankTCPExample3Server.class.getName() + " has started..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2318); // changed from 2317 to 2318
+ OutputStream os;
+ PrintStream ps;
+ InetAddress localAddress, remoteAddress;
+ int localPort, remotePort;
+ int serverLoopCount = 0;
+
+ // Server is up and waiting (i.e. "blocked" or paused)
+ // Loop, infinitely, waiting for client connections.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ try ( Socket clientConnectionSocket = serverSocket.accept()) {
+ serverLoopCount++; // increment at beginning of loop for reliability
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ os = clientConnectionSocket.getOutputStream();
+ ps = new PrintStream(os);
+ if (serverLoopCount <= 20) { // checking if the loop count <= 20
+ ps.println("This is response " + serverLoopCount + " produced by the server."); // this gets sent back to client!
+ } else {
+ ps.println("this is good bye message from the server"); // termination after 20 messages
+ break; // Stop server
+ }
+ // Print some information locally about the Socket connection.
+ // This includes the port and IP numbers on both sides (the socket pair).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ remoteAddress = clientConnectionSocket.getInetAddress();
+ localPort = clientConnectionSocket.getLocalPort();
+ remotePort = clientConnectionSocket.getPort();
+
+ System.out.print("Server loop " + serverLoopCount + ": ");
+
+ // 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(FrankTCPExample3Server.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( "
+ + localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
+ + remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if (localAddress.getHostName().equals(localAddress.getHostAddress())
+ || remoteAddress.getHostName().equals(remoteAddress.getHostAddress())) {
+ System.out.println(" note HostName matches address if host has no DNS name");
+ }
+
+ // Not/*i*/ce the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + FrankTCPExample3Server.class.getName() + " networking: " + 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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3ServerClient.JPG b/assignments/src/MV3500Cohort2022MayJune/homework1/FrankTCPExample3ServerClient.JPG
new file mode 100644
index 0000000000000000000000000000000000000000..3a5853becfde3cdc97b73849da1f168963efe360
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diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/HittnerDomTcpExample1Telnet.java b/assignments/src/MV3500Cohort2022MayJune/homework1/HittnerDomTcpExample1Telnet.java
new file mode 100644
index 0000000000000000000000000000000000000000..ec37e50b5ff59b0b998dd12abc7a884512a2c62d
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/HittnerDomTcpExample1Telnet.java
@@ -0,0 +1,66 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * homework assignment
+ * @author adfis
+ */
+
+
+public class HittnerDomTcpExample1Telnet
+{
+ /** run the program
+ * @param args command-line arguments, string parameters (unused) */
+ 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 Domo"); // to remote clientnc
+ ps.println("DomsaMom");
+ System.out.println("Client response was brought to you by the Domo"); // to server console
+ System.out.println("DomsaMom");
+
+ // "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!");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/HittnerNickTcpExample1Telnet.java b/assignments/src/MV3500Cohort2022MayJune/homework1/HittnerNickTcpExample1Telnet.java
new file mode 100644
index 0000000000000000000000000000000000000000..2dc1686f7791881759c7971f5bfdf360b2b19d76
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/HittnerNickTcpExample1Telnet.java
@@ -0,0 +1,66 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * homework assignment
+ * @author adfis
+ */
+
+
+public class HittnerNickTcpExample1Telnet
+{
+ /** run the program
+ * @param args command-line arguments, string parameters (unused) */
+ 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!");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/KeevenTCPExample3Client.java b/assignments/src/MV3500Cohort2022MayJune/homework1/KeevenTCPExample3Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..f318ba5ab1d4d68c6bbbd7f2a889a891ada842b1
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/KeevenTCPExample3Client.java
@@ -0,0 +1,100 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * This is Assignment 1 where I have modified the given code from TCPExample3Client
+ * -sleep time has been extended to give more time in between loops
+ * -Initial print line has been altered to reflect assingnment 1
+ * -Loop only runs a finite number of times ,10.
+ * Before, we always used telnet (netcat) to connect to the server. Here we are
+ * now writing our own program to do the connection.
+ *
+ * As you will see, when we run this after we start the server we will see the
+ * same string telnet printed, sent by the server. The output at the server will
+ * show different socket pairs for each time the loop iterates.
+ *
+ * @author mcgredo
+ * @author brutzman
+ */
+public class KeevenTCPExample3Client {
+
+ /** IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
+ * @see <a href="https://en.wikipedia.org/wiki/localhost">https://en.wikipedia.org/wiki/localhost</a>
+ * @see <a href="https://en.wikipedia.org/wiki/IPv6_address">https://en.wikipedia.org/wiki/IPv6_address</a>
+ */
+ public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
+
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ public static void main(String[] args)
+ {
+
+ // Local variables/fields
+ Socket socket = null;
+ InputStream is;
+ Reader isr;
+ BufferedReader br;
+ String serverMessage;
+ int clientLoopCount = 0;
+ int numbLoops = 10;
+
+ try {
+ while (clientLoopCount < numbLoops)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(KeevenTCPExample3Client.class.getName() + " 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 a Socket
+ // object; the server uses a ServerSocket to wait for
+ // connections.
+ socket = new Socket(LOCALHOST, 2317); // locohost?
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ is = socket.getInputStream();
+ isr = new InputStreamReader(is);
+ br = new BufferedReader(isr);
+
+ // Read a single line written by the server. We'd
+ // do things a bit differently if there were many lines to be read
+ // from the server instead of one only.
+ serverMessage = br.readLine();
+ System.out.println("======================Assignment1===========================");
+
+ System.out.print ("Client loop " + clientLoopCount + ": ");
+ System.out.println("now we're talking!");
+ System.out.println("The message the server sent was: '" + serverMessage + "'");
+ // socket gets closed, either automatically/silently by this code (or possibly by the server)
+
+ Thread.sleep(800l); // slow things down, for example 500l (long) = 500 msec
+
+ } // end while(true) // infinite loops are dangerous, be sure to kill this process!
+ }
+ catch (IOException | InterruptedException e)
+ {
+ System.err.println("Problem with " + KeevenTCPExample3Client.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!");
+ }
+ }
+ finally // occurs after any other activity when shutting down
+ {
+ try {
+ if (socket != null)
+ socket.close();
+ } catch (IOException e) {}
+
+ // program exit: tell somebody about that happening. Likely cause: server drops connection.
+ System.out.println();
+ System.out.println(KeevenTCPExample3Client.class.getName() + " exit");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/KeevenTCPExample3Server.java b/assignments/src/MV3500Cohort2022MayJune/homework1/KeevenTCPExample3Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..a3423cf6b5fdd89f12ea4e8019ea9c5f61c697b5
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/KeevenTCPExample3Server.java
@@ -0,0 +1,107 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * This is Assignment 1 where I have modified the given code from TCPExample3Server
+ *-server response message changed
+ *
+ * Very slightly more complex than example1, further modifying example2. 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 (nc) localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @author mcgredo
+ * @author brutzman
+ */
+public class KeevenTCPExample3Server {
+
+ /**
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
+ * @param args command-line arguments
+ */
+ 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.
+ System.out.println(KeevenTCPExample3Server.class.getName() + " has started..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2317);
+ OutputStream os;
+ PrintStream ps;
+ InetAddress localAddress, remoteAddress;
+ int localPort, remotePort;
+ int serverLoopCount = 0;
+
+ // Server is up and waiting (i.e. "blocked" or paused)
+ // Loop, infinitely, waiting for client connections.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ try (Socket clientConnectionSocket = serverSocket.accept())
+ {
+ serverLoopCount++; // increment at beginning of loop for reliability
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ os = clientConnectionSocket.getOutputStream();
+ ps = new PrintStream(os);
+ ps.println("This is response " + serverLoopCount + " produced by the server, "
+ + KeevenTCPExample3Server.class.getName()); // this gets sent back to client!
+
+ // Print some information locally about the Socket connection.
+ // This includes the port and IP numbers on both sides (the socket pair).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ remoteAddress = clientConnectionSocket.getInetAddress();
+ localPort = clientConnectionSocket.getLocalPort();
+ remotePort = clientConnectionSocket.getPort();
+
+ System.out.print ("Server loop " + serverLoopCount + ": ");
+
+ // 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(KeevenTCPExample3Server.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+ remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+ System.out.println(" note HostName matches address if host has no DNS name");
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + KeevenTCPExample3Server.class.getName() + " networking: " + 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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/LeckieTcpExample2.java b/assignments/src/MV3500Cohort2022MayJune/homework1/LeckieTcpExample2.java
new file mode 100644
index 0000000000000000000000000000000000000000..9840d568accba730c1ede1060045d3d80ecf09fe
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/LeckieTcpExample2.java
@@ -0,0 +1,107 @@
+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 leckie
+ */
+public class LeckieTcpExample2
+{
+ /**
+ * 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(" 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!");
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/McNeelyTCPExample2.java b/assignments/src/MV3500Cohort2022MayJune/homework1/McNeelyTCPExample2.java
new file mode 100644
index 0000000000000000000000000000000000000000..3f56434d00c2c1fd5b344f3d5878e0b82ea4f6e8
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/McNeelyTCPExample2.java
@@ -0,0 +1,105 @@
+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
+{
+ /** run the program
+ * @param args command-line arguments, string parameters (unused) */
+ 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!");
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/MorrisTcpExample1Telnet.java b/assignments/src/MV3500Cohort2022MayJune/homework1/MorrisTcpExample1Telnet.java
new file mode 100644
index 0000000000000000000000000000000000000000..38bbcc2768c17a68917f54b005e31564dbfa7a3d
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/MorrisTcpExample1Telnet.java
@@ -0,0 +1,86 @@
+package MV3500Cohort2021JulySeptember.homework1;;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * The simplest possible TCP network program. It listens for
+ * a connection, from telnet (telnet localhost 2317) or a program
+ * you write, which we will do later. Right now the TcpExample simply
+ * writes a string in response to a connection.
+ *
+ * Modifying his program is the basis for Assignment 1.
+ *
+ * Testing the running server program from telnet looks like this:
+ *
+ * it154916:projects mcgredo$ telnet localhost 2317
+ * Trying ::1...
+ * Connected to localhost.
+ * Escape character is '^]'.
+ * This was written by the server
+ * Connection closed by foreign host.
+ *
+ * Notice that "This was written by the server" matches
+ * what is written by the code below, over the output stream.
+ *
+ * After this first connection the program below drops out
+ * the bottom of the program, and does not repeat itself.
+ * The program exits.
+ *
+ * @author mcgredo
+ * @author brutzman
+ */
+public class MorrisTcpExample1Telnet
+{
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ 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()) // 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 Johnny Smiles "); // to remote client
+ ps.println("MOVES 2021 Cohort is full of badassery.");
+ System.out.println("This server response was written by Johnny Smiles " ); // to server console
+
+ // "flush()" in important in that it forces a write
+ // across what is in fact a slow connection
+ ps.flush();
+ }
+ System.out.println(" completed successfully.");
+ }
+ catch(IOException e)
+ {
+ System.err.println(" Pardon the interruption, networking issue"); // 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!");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/PughTcp2ConnectionCounting.java b/assignments/src/MV3500Cohort2022MayJune/homework1/PughTcp2ConnectionCounting.java
new file mode 100644
index 0000000000000000000000000000000000000000..a95d95748eb8d8774fd482b10b535cf1a5d1c718
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/PughTcp2ConnectionCounting.java
@@ -0,0 +1,104 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+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()) {
+
+
+ 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 && connectionCount % 3 == 1) {
+ System.out.println("Gators!");
+ }
+ if (connectionCount % 3 == 1 && connectionCount != 0) {
+ System.out.println("O'Doyle Rules!!!");
+ }
+ 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();
+ connectionCount++; // got another one!
+ }
+ }
+ } 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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/README.md b/assignments/src/MV3500Cohort2022MayJune/homework1/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..e5bd42a3887286271cc8c591aea01fa2b56f783c
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/README.md
@@ -0,0 +1,11 @@
+## Homework 1: Unicast Networking
+
+Welcome everybody! This is where your homework goes.
+
+Deliverables:
+
+* Update unicast sockets sender/receiver, modifying provided code, test via telnet.
+* Demonstrate ability to build, run and document Java programs that perform networking tasks.
+
+Please see the [README.md](../../../README.md) in the parent
+[assignments](../../../../assignments) directory for detailed instructions.
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/ReynoldsTcpExample1Telnet1.java b/assignments/src/MV3500Cohort2022MayJune/homework1/ReynoldsTcpExample1Telnet1.java
new file mode 100644
index 0000000000000000000000000000000000000000..8541e83a90462a21210422e5e616818bdbecaec9
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/ReynoldsTcpExample1Telnet1.java
@@ -0,0 +1,75 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * homework assignment
+ * @author kReynolds
+ */
+
+
+public class ReynoldsTcpExample1Telnet1
+{
+ /** run the program
+ * @param args command-line arguments, string parameters (unused) */
+ 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)... \n" );
+
+ // 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("Initiating Client-side handshake... \n"); // to remote clientnc
+ ps.println("Requesting authentication...");
+ ps.println("Authentication granted \n");
+
+ ps.println("Secret message sent to host \n");
+ ps.println("Disconnecting from host...");
+
+ System.out.println("Conducting server-side handshake..."); // to server console
+ System.out.println("Granting authentication \n");
+
+ System.out.println("Secret message recieved from client...");
+ System.out.println("Client sent 'hello' message \n");
+ System.out.println("Disconnecting connection to client... \n");
+
+ // "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!");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/RobinsonTcpExample1Telnet.java b/assignments/src/MV3500Cohort2022MayJune/homework1/RobinsonTcpExample1Telnet.java
new file mode 100644
index 0000000000000000000000000000000000000000..5ac1aa1797862c494d16b5c458904e0304b11cc3
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/RobinsonTcpExample1Telnet.java
@@ -0,0 +1,63 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * homework assignment
+ * @author mrobi
+ */
+public class RobinsonTcpExample1Telnet
+{
+ /** run the program
+ * @param args command-line arguments, string parameters (unused) */
+ 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 Matt's server TcpExample1."); // to remote clientnc
+ ps.println("Can you hear me?");
+ System.out.println("Client response was written by Matt's server TcpExample1."); // to server console
+ System.out.println("Yes");
+
+ // "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!");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/SchlesselTcpExample1Telnet.java b/assignments/src/MV3500Cohort2022MayJune/homework1/SchlesselTcpExample1Telnet.java
new file mode 100644
index 0000000000000000000000000000000000000000..7a7dad3f4a2a09b89dc29e4bff9069faada30cc7
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/SchlesselTcpExample1Telnet.java
@@ -0,0 +1,65 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+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!");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/TcpExample2_Leckie_Mod_Hw1.java b/assignments/src/MV3500Cohort2022MayJune/homework1/TcpExample2_Leckie_Mod_Hw1.java
new file mode 100644
index 0000000000000000000000000000000000000000..e48eff8bbdf1745948c63ae3db12cc4cd97a036f
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/TcpExample2_Leckie_Mod_Hw1.java
@@ -0,0 +1,107 @@
+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 leckie
+ */
+public class TcpExample2_Leckie_Mod_Hw1
+{
+ /**
+ * 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(" 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 applicant 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!");
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2022MayJune/homework1/package-info.java b/assignments/src/MV3500Cohort2022MayJune/homework1/package-info.java
new file mode 100644
index 0000000000000000000000000000000000000000..f196f197c1907cd5ea116765a6774f718822d940
--- /dev/null
+++ b/assignments/src/MV3500Cohort2022MayJune/homework1/package-info.java
@@ -0,0 +1,10 @@
+/**
+ * TCP Unicast homework assignments supporting the NPS MOVES MV3500 Networked Graphics course.
+ *
+ * @see <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/tree/master/assignments">networkedGraphicsMV3500 assignments</a>
+ * @see java.lang.Package
+ * @see <a href="https://stackoverflow.com/questions/22095487/why-is-package-info-java-useful">StackOverflow: why-is-package-info-java-useful</a>
+ * @see <a href="https://stackoverflow.com/questions/624422/how-do-i-document-packages-in-java">StackOverflow: how-do-i-document-packages-in-java</a>
+ */
+
+package MV3500Cohort2021JulySeptember.homework1;