From ca8d49ac3a93489c99e7ce7cc7feb0d5c3b191b4 Mon Sep 17 00:00:00 2001
From: "Weissenberger, Bernd FORNATL, GY" <bernd.weissenberger.gy@nps.edu>
Date: Wed, 2 Sep 2020 10:46:58 -0700
Subject: [PATCH] Upload New File
---
.../Weissenberger/TCPReceiverVPNBridge.java | 99 +++++++++++++++++++
1 file changed, 99 insertions(+)
create mode 100644 assignments/src/MV3500Cohort2020JulySeptember/homework4/Weissenberger/TCPReceiverVPNBridge.java
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework4/Weissenberger/TCPReceiverVPNBridge.java b/assignments/src/MV3500Cohort2020JulySeptember/homework4/Weissenberger/TCPReceiverVPNBridge.java
new file mode 100644
index 0000000000..43a014be20
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework4/Weissenberger/TCPReceiverVPNBridge.java
@@ -0,0 +1,99 @@
+
+package MV3500Cohort2020JulySeptember.homework4.Weissenberger;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * Just for me for testing - not part of Homework #3!
+ * @author Loki
+ */
+public class TCPReceiverVPNBridge {
+
+ protected static String server_IP_VPN = "10.1.105.9"; // argon IP
+ protected static String server_IP_Local = "192.168.188.103"; // Local IP
+
+ private static final int server_Port = 2317 ;
+ protected static String client_IP ;
+
+ /**
+ * @param args the 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("TcpExample3Server has started..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(server_Port);
+ 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."); // 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("TcpExample3Server 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 TcpExample3Server 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!");
+ }
+ }
+ }
+
+}
--
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