diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting b/assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting
new file mode 100644
index 0000000000000000000000000000000000000000..492e78f857cc84ca5d90e986e9ba2cb65c5b6538
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting
@@ -0,0 +1,103 @@
+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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting.java b/assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting.java
new file mode 100644
index 0000000000000000000000000000000000000000..492e78f857cc84ca5d90e986e9ba2cb65c5b6538
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework1/PughTcp2ConnectionCounting.java
@@ -0,0 +1,103 @@
+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!");
+ }
+ }
+ }
+}
diff --git a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
index 988aac7e8f7a288b1ea201bf208a239c5748d999..478508c9f768ba7c8882b3f0327db22ec303f02e 100644
--- a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
+++ b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
@@ -33,7 +33,16 @@ public class TcpExample2ConnectionCounting
{
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)..." );
+ // Where are we? In other words, what is our host number? Advertise it
+ // https://stackoverflow.com/questions/9481865/getting-the-ip-address-of-the-current-machine-using-java
+ String localHostAddress = Inet4Address.getLocalHost().toString();
+ System.out.println("Local host address is " + localHostAddress);
+ if (localHostAddress.contains("/"))
+ localHostAddress = localHostAddress.substring(localHostAddress.indexOf("/")+1);
+ // show localhost IP number to facilitate connections over local area network (LAN, WAN)
+ System.out.println(" enter (nc localhost 2317) or (telnet localhost 2317) for local operation" );
+ System.out.println(" enter (nc " + localHostAddress + " 2317) or " +
+ "(telnet " + localHostAddress + " 2317)..." );
// ServerSocket waits for a connection from a client.
// Notice that it is outside the loop; ServerSocket needs to be made only once.
@@ -42,7 +51,7 @@ public class TcpExample2ConnectionCounting
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)
diff --git a/presentations/03_TCPIP.pptx b/presentations/03_TCPIP.pptx
index 65fa0684b829ef545e9626f986cc29aaa0eb0c4d..cbe387103bf98c12d2381cf7cb43fe7a22ba5e81 100644
Binary files a/presentations/03_TCPIP.pptx and b/presentations/03_TCPIP.pptx differ
diff --git a/presentations/04_TCPSocketsJava.pptx b/presentations/04_TCPSocketsJava.pptx
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..19ab33d24b7c6200f38a75bb4c57db5d3268381f 100644
Binary files a/presentations/04_TCPSocketsJava.pptx and b/presentations/04_TCPSocketsJava.pptx differ