diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Garibay/UDPReceiverGaribay.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Garibay/UDPReceiverGaribay.java
new file mode 100644
index 0000000000000000000000000000000000000000..2f1b250b8d9b45e30625ddfc4de3c28441861ba4
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Garibay/UDPReceiverGaribay.java
@@ -0,0 +1,88 @@
+
+package MV3500Cohort2020JulySeptember.homework3.Garibay;
+
+import java.io.ByteArrayInputStream;
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+
+/**
+ *
+ * @author chris
+ */
+public class UDPReceiverGaribay
+{
+// public static final int SENDING_PORT = 1414; // port used by UdpSender, unneeded here
+ public static final int RECEIVING_PORT = 1415;
+ public static final String DESINATION_HOST = "localhost";
+
+ /**
+ * @param args the command line arguments
+ * @throws java.io.IOException
+ */
+ public static void main(String[] args) throws IOException
+ {
+ DatagramSocket udpSocket = null;
+
+ try
+ {
+ System.out.println(UdpReceiver.class.getName() + " started...");
+
+ // Create a UDP socket
+ udpSocket = new DatagramSocket(RECEIVING_PORT);
+ udpSocket.setReceiveBufferSize(1500); // how many bytes are in buffer? MTU=1500 is good
+ udpSocket.setBroadcast(false); // we're just receiving here
+
+ byte[] byteArray = new byte[1500];
+ DatagramPacket receivePacket = new DatagramPacket(byteArray, byteArray.length);
+
+ ByteArrayInputStream bais = new ByteArrayInputStream(byteArray);
+ DataInputStream dis = new DataInputStream(bais);
+
+ boolean isEvenParity;
+ int packetCount = 0;
+ int firstInt;
+ float secondFloat;
+ String thirdString;
+ String padding;
+
+ // You need a new receiving packet to read from every packet received
+ while (true)
+ {
+ packetCount++; // good practice to increment counter at start of loop, when possible
+ udpSocket.receive(receivePacket); // blocks until packet is received
+
+ // values of interest follow. order and types of what was sent must match what you are reading!
+ firstInt = dis.readInt(); // packetID
+ secondFloat = dis.readFloat();
+ thirdString = dis.readUTF(); // string value with guaranteed encoding, matches UTF-8 is 8 bit
+ isEvenParity = dis.readBoolean(); // ok, we've gotten everything we're looking for.
+
+ dis.reset(); // now clear the input stream after reading, in preparation for next loop
+
+ if (isEvenParity)
+ padding = " ";
+ else padding = "";
+
+ System.out.println("[" + UdpReceiver.class.getName() + "]" +
+ " packetID=" + firstInt + // have output message use same name as sender
+ ", second float value=" + secondFloat +
+ ", third String value=\"" + thirdString + "\"" + // note that /" is literal quote character
+ " isPacketIdEvenParity=" + isEvenParity + "," + padding +
+ " packet counter=" + packetCount);
+ }
+ }
+ catch(IOException e)
+ {
+ System.err.println("Problem with UdpReceiver, see exception trace:");
+ System.err.println(e);
+ }
+ finally // clean up prior to exit, don't want to leave behind zombie socket
+ {
+ if (udpSocket != null)
+ udpSocket.close();
+ System.out.println(UdpReceiver.class.getName() + " complete."); // all done
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Garibay/UDPSenderGaribay.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Garibay/UDPSenderGaribay.java
new file mode 100644
index 0000000000000000000000000000000000000000..21c6de803955c64d7ea0a8d431185b524e839733
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Garibay/UDPSenderGaribay.java
@@ -0,0 +1,114 @@
+
+package MV3500Cohort2020JulySeptember.homework3.Garibay;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+
+/**
+ *
+ * @author chris
+ */
+public class UDPSenderGaribay
+{
+ // System properties: https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
+ public static final String MY_NAME = System.getProperty("user.name"); // guru incantation 8)
+// public static final int SENDING_PORT = 1414; // not needed, can let system choose an open local port
+ public static final int RECEIVING_PORT = 1415;
+ public static final int TOTAL_PACKETS_TO_SEND = 100;
+
+ // here is what we need for lab comms
+ // Bill Mahan's host ip
+ public static final String DESTINATION_HOST = "10.1.105.13"; // localhost 127.0.0.1 or argon 10.1.105.1 or 10.1.105.1 or whatever
+
+ @SuppressWarnings("SleepWhileInLoop")
+ public static void main(String[] args) throws IOException
+ {
+ DatagramSocket udpSocket = null;
+ DataOutputStream dos = null;
+ int packetID = 0; // counter variable to send in packet
+ float value = -1.0f; // unreachable value is good sentinel to ensure expected changes occur
+ String message = MY_NAME + "It's not a trick question!"; // no really
+ String padding = new String();
+
+ try
+ {
+ System.out.println(UdpSender.class.getName() + " shows how to send simple-type values via DataOutputStream");
+ System.out.println(UdpSender.class.getName() + " started...");
+
+ // Create a UDP socket
+ udpSocket = new DatagramSocket(); // let system assign output port, then SENDING_PORT not needed
+
+ // Put together a message with binary content. "ByteArrayOutputStream"
+ // is a java.io utility that lets us put together an array of binary
+ // data, which we put into the UDP packet.
+
+ ByteArrayOutputStream baos = new ByteArrayOutputStream(1500); // how many bytes are in buffer? MTU=1500 is good
+ dos = new DataOutputStream(baos); // wrapper for writing values, connects both streams
+
+ // Put together a packet to send
+ // these types and order of variables must match on sender and receiver
+ byte[] byteArray = baos.toByteArray();
+
+ // ID of the host we are sending to
+ InetAddress destinationAddress = InetAddress.getByName(DESTINATION_HOST);
+ // ID of the host we are sending from
+ InetAddress sourceAddress = InetAddress.getByName("localhost"); // possibly identical if source not modified
+
+ DatagramPacket datagramPacket = new DatagramPacket(byteArray, byteArray.length, destinationAddress, RECEIVING_PORT);
+
+ // Hmmm, how fast does UDP stream go? Does UDP effectively slow packets down, or does
+ // this cause network problems? (hint: yes for an unlimited send rate, unlike TCP).
+ // How do you know on the receiving side that you haven't received a
+ // duplicate UDP packet, out-of-order packet, or dropped packet? your responsibility.
+
+ for (int index = 1; index <= TOTAL_PACKETS_TO_SEND; index++) // avoid infinite send loops in code, they can be hard to kill!
+ {
+ packetID++; // increment counter, prefer using explicit value to index
+ value = TOTAL_PACKETS_TO_SEND - packetID; // countdown
+ boolean isPacketIdEvenParity = ((packetID % 2) == 0); // % is modulo operator; result 0 is even parity, 1 is odd parity
+
+ // values of interest follow. order and types of what was sent must match what you are reading!
+ dos.writeInt (packetID);
+ dos.writeFloat (value);
+ dos.writeUTF (message); // string value with guaranteed encoding, matches UTF-8 is 8 bit
+ dos.writeBoolean(isPacketIdEvenParity);
+
+ dos.flush(); // sends DataOutputStream to ByteArrayOutputStream
+ byteArray = baos.toByteArray(); // OK so go get the flushed result...
+ datagramPacket.setData(byteArray); // and put it in the packet...
+ udpSocket.send(datagramPacket); // and send it away. boom gone, nonblocking.
+// System.out.println("udpSocket output port=" + udpSocket.getLocalPort()); // diagnostic tells what port was chosen by system
+
+ if (isPacketIdEvenParity)
+ padding = " ";
+ else padding = "";
+
+ Thread.sleep(1000); // Send packets at rate of one per second
+ System.out.println("[" + UdpSender.class.getName() + "] " + MY_NAME + " " + sourceAddress +
+ " sent values(" + packetID + "," + value + ",\"" + message + "\"," + isPacketIdEvenParity +
+ ")" + padding + " as packet #" + index + " of " + TOTAL_PACKETS_TO_SEND);
+ baos.reset(); // clear the output stream after sending
+ }
+ }
+ catch (IOException | InterruptedException e)
+ {
+ System.err.println("Problem with UdpSender, see exception trace:");
+ System.err.println(e);
+ }
+ finally // clean up prior to exit, don't want to leave behind zombies
+ {
+ if (udpSocket != null)
+ udpSocket.close();
+
+ if (dos != null)
+ dos.close();
+ System.out.println(UdpSender.class.getName() + " complete."); // all done
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberReceiver.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Goericke/TCPNumberReceiverUDPResultSender.java
similarity index 91%
rename from assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberReceiver.java
rename to assignments/src/MV3500Cohort2020JulySeptember/homework3/Goericke/TCPNumberReceiverUDPResultSender.java
index cb31931d1892a9efd1a02e6c895c0bfd819d23a8..f9a58490506bf9d40d70cc31b3ce1bc758f87e24 100644
--- a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberReceiver.java
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Goericke/TCPNumberReceiverUDPResultSender.java
@@ -1,4 +1,4 @@
-package MV3500Cohort2020JulySeptember.homework3.Weissenberger;
+package MV3500Cohort2020JulySeptember.homework3.Goericke;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
@@ -16,10 +16,9 @@ import java.net.Socket;
* This class will be connected by an TCP sender over VPN (argon), calculating
* a result of an equation and send the result back via UDP over VPN.
* @date 08/17/2020
- * @author Loki
- * @group Weissenberger/Goericke
+ * @group Goericke/Weissenberger
*/
-public class TCPNumberReceiver {
+public class TCPNumberReceiverUDPResultSender {
// Change this to the port where the TCP server is listening
private static final int TCP_ARGON_SERVER_PORT = 2317;
@@ -34,17 +33,19 @@ public class TCPNumberReceiver {
System.out.println("TCPNumberReceiver has started...");
ServerSocket serverSocket = new ServerSocket(TCP_ARGON_SERVER_PORT);
InetAddress remoteAddress;
-
+
+ // declare the stream and readers
InputStream inputStream;
InputStreamReader inputStreamReader;
BufferedReader bufferedReader;
+
+ // declare needed variables
String clientMessage;
int number1, number2;
String calculation_Method;
int iUDPResultReceivingPort;
// 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
@@ -54,17 +55,21 @@ public class TCPNumberReceiver {
inputStream = clientConnectionSocket.getInputStream();
inputStreamReader = new InputStreamReader(inputStream);
bufferedReader = new BufferedReader(inputStreamReader);
+
+ // get the date from TCP packet
clientMessage = bufferedReader.readLine();
number1 = Integer.parseInt(bufferedReader.readLine());
number2 = Integer.parseInt(bufferedReader.readLine());
calculation_Method = bufferedReader.readLine();
iUDPResultReceivingPort = Integer.parseInt(bufferedReader.readLine());
+
+ // print them out (for debugging)
System.out.println("Message recived: "+clientMessage);
System.out.println("Number 1 recived: "+number1);
System.out.println("Number 2 recived: "+number2);
System.out.println("Calc Method recived: "+calculation_Method);
System.out.println("Send result to port: "+iUDPResultReceivingPort);
- // This includes the port and IP numbers on both sides (the socket pair).
+ // get the sender IP (is used for sending UDP)
remoteAddress = clientConnectionSocket.getInetAddress();
System.out.println("Send result to IP: "+remoteAddress.getHostAddress());
@@ -83,6 +88,13 @@ public class TCPNumberReceiver {
}
}
+ /**
+ * send the result to Bernd 10x
+ * @param result
+ * @param inetAddress Bernd's IP
+ * @param port Bernd's UDP port number
+ * @throws IOException
+ */
private static void sendResultViaUDP(float result, InetAddress inetAddress, int port) throws IOException{
DatagramSocket udpSocket = null;
DataOutputStream dos = null;
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/MahanUdpReceiver.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/MahanUdpReceiver.java
new file mode 100644
index 0000000000000000000000000000000000000000..7d7ca1757bf7b15d90f93c3d16e2f1fd5570ae38
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/MahanUdpReceiver.java
@@ -0,0 +1,84 @@
+package MV3500Cohort2020JulySeptember.homework3.Mahan;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ *
+ * @author Bill
+ */
+public class MahanUdpReceiver
+{
+// public static final int SENDING_PORT = 1414; // port used by UdpSender, unneeded here
+ public static final int RECEIVING_PORT = 1415;
+ public static final String DESINATION_HOST = "10.1.105.12";
+
+ /**
+ * @param args the command line arguments
+ * @throws java.io.IOException
+ */
+ public static void main(String[] args) throws IOException
+ {
+ DatagramSocket udpSocket = null;
+
+ try
+ {
+ System.out.println(MahanUdpReceiver.class.getName() + " started...");
+
+ // Create a UDP socket
+ udpSocket = new DatagramSocket(RECEIVING_PORT);
+ udpSocket.setReceiveBufferSize(1500); // how many bytes are in buffer? MTU=1500 is good
+ udpSocket.setBroadcast(false); // we're just receiving here
+
+ byte[] byteArray = new byte[1500];
+ DatagramPacket receivePacket = new DatagramPacket(byteArray, byteArray.length);
+
+ ByteArrayInputStream bais = new ByteArrayInputStream(byteArray);
+ DataInputStream dis = new DataInputStream(bais);
+
+ boolean isEvenParity;
+ int packetCount = 0;
+ int firstInt;
+ float secondFloat;
+ String thirdString;
+ String padding;
+
+ // You need a new receiving packet to read from every packet received
+ while (true)
+ {
+ packetCount++; // good practice to increment counter at start of loop, when possible
+ udpSocket.receive(receivePacket); // blocks until packet is received
+
+ // values of interest follow. order and types of what was sent must match what you are reading!
+ firstInt = dis.readInt(); // packetID
+ secondFloat = dis.readFloat();
+ thirdString = dis.readUTF(); // string value with guaranteed encoding, matches UTF-8 is 8 bit
+ isEvenParity = dis.readBoolean(); // ok, we've gotten everything we're looking for.
+
+ dis.reset(); // now clear the input stream after reading, in preparation for next loop
+
+ if (isEvenParity)
+ padding = " ";
+ else padding = "";
+
+ System.out.println("[" + MahanUdpReceiver.class.getName() + "]" +
+ " packetID=" + firstInt + // have output message use same name as sender
+ ", second float value=" + secondFloat +
+ ", third String value=\"" + thirdString + "\"" + // note that /" is literal quote character
+ " isPacketIdEvenParity=" + isEvenParity + "," + padding +
+ " packet counter=" + packetCount);
+ }
+ }
+ catch(IOException e)
+ {
+ System.err.println("Problem with UdpReceiver, see exception trace:");
+ System.err.println(e);
+ }
+ finally // clean up prior to exit, don't want to leave behind zombie socket
+ {
+ if (udpSocket != null)
+ udpSocket.close();
+ System.out.println(MahanUdpReceiver.class.getName() + " complete."); // all done
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/MahanUdpSender.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/MahanUdpSender.java
new file mode 100644
index 0000000000000000000000000000000000000000..199cbd5217bd2e9ce943a7df983686dc3ed3a474
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/MahanUdpSender.java
@@ -0,0 +1,106 @@
+package MV3500Cohort2020JulySeptember.homework3.Mahan;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ *
+ * @author Bill
+ */
+public class MahanUdpSender
+{
+ // System properties: https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
+ public static final String MY_NAME = System.getProperty("user.name"); // guru incantation 8)
+// public static final int SENDING_PORT = 1414; // not needed, can let system choose an open local port
+ public static final int RECEIVING_PORT = 1415;
+ public static final int TOTAL_PACKETS_TO_SEND = 100;
+
+ // here is what we need for lab comms
+ public static final String DESTINATION_HOST = "10.1.105.12"; // localhost 127.0.0.1 or argon 10.1.105.1 or 10.1.105.1 or whatever
+
+ @SuppressWarnings("SleepWhileInLoop")
+ public static void main(String[] args) throws IOException
+ {
+ DatagramSocket udpSocket = null;
+ DataOutputStream dos = null;
+ int packetID = 0; // counter variable to send in packet
+ float value = -1.0f; // unreachable value is good sentinel to ensure expected changes occur
+ String message = MY_NAME + " says I see you Chris"; // no really
+ String padding = new String();
+
+ try
+ {
+ System.out.println(MahanUdpSender.class.getName() + " shows how to send simple-type values via DataOutputStream");
+ System.out.println(MahanUdpSender.class.getName() + " started...");
+
+ // Create a UDP socket
+ udpSocket = new DatagramSocket(); // let system assign output port, then SENDING_PORT not needed
+
+ // Put together a message with binary content. "ByteArrayOutputStream"
+ // is a java.io utility that lets us put together an array of binary
+ // data, which we put into the UDP packet.
+
+ ByteArrayOutputStream baos = new ByteArrayOutputStream(1500); // how many bytes are in buffer? MTU=1500 is good
+ dos = new DataOutputStream(baos); // wrapper for writing values, connects both streams
+
+ // Put together a packet to send
+ // these types and order of variables must match on sender and receiver
+ byte[] byteArray = baos.toByteArray();
+
+ // ID of the host we are sending to
+ InetAddress destinationAddress = InetAddress.getByName(DESTINATION_HOST);
+ // ID of the host we are sending from
+ InetAddress sourceAddress = InetAddress.getByName("localhost"); // possibly identical if source not modified
+
+ DatagramPacket datagramPacket = new DatagramPacket(byteArray, byteArray.length, destinationAddress, RECEIVING_PORT);
+
+ // Hmmm, how fast does UDP stream go? Does UDP effectively slow packets down, or does
+ // this cause network problems? (hint: yes for an unlimited send rate, unlike TCP).
+ // How do you know on the receiving side that you haven't received a
+ // duplicate UDP packet, out-of-order packet, or dropped packet? your responsibility.
+
+ for (int index = 1; index <= TOTAL_PACKETS_TO_SEND; index++) // avoid infinite send loops in code, they can be hard to kill!
+ {
+ packetID++; // increment counter, prefer using explicit value to index
+ value = TOTAL_PACKETS_TO_SEND - packetID; // countdown
+ boolean isPacketIdEvenParity = ((packetID % 2) == 0); // % is modulo operator; result 0 is even parity, 1 is odd parity
+
+ // values of interest follow. order and types of what was sent must match what you are reading!
+ dos.writeInt (packetID);
+ dos.writeFloat (value);
+ dos.writeUTF (message); // string value with guaranteed encoding, matches UTF-8 is 8 bit
+ dos.writeBoolean(isPacketIdEvenParity);
+
+ dos.flush(); // sends DataOutputStream to ByteArrayOutputStream
+ byteArray = baos.toByteArray(); // OK so go get the flushed result...
+ datagramPacket.setData(byteArray); // and put it in the packet...
+ udpSocket.send(datagramPacket); // and send it away. boom gone, nonblocking.
+// System.out.println("udpSocket output port=" + udpSocket.getLocalPort()); // diagnostic tells what port was chosen by system
+
+ if (isPacketIdEvenParity)
+ padding = " ";
+ else padding = "";
+
+ Thread.sleep(1000); // Send packets at rate of one per second
+ System.out.println("[" + MahanUdpSender.class.getName() + "] " + MY_NAME + " " + sourceAddress +
+ " sent values(" + packetID + "," + value + ",\"" + message + "\"," + isPacketIdEvenParity +
+ ")" + padding + " as packet #" + index + " of " + TOTAL_PACKETS_TO_SEND);
+ baos.reset(); // clear the output stream after sending
+ }
+ }
+ catch (IOException | InterruptedException e)
+ {
+ System.err.println("Problem with UdpSender, see exception trace:");
+ System.err.println(e);
+ }
+ finally // clean up prior to exit, don't want to leave behind zombies
+ {
+ if (udpSocket != null)
+ udpSocket.close();
+
+ if (dos != null)
+ dos.close();
+ System.out.println(MahanUdpSender.class.getName() + " complete."); // all done
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/README.md b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/README.md
index 0144d62d033fbe094ceac7a6d1bedc12d3c158b0..40200564c63ff03aa0328e08b2713cd80d252c3a 100644
--- a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/README.md
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/README.md
@@ -1,12 +1,8 @@
-## Homework 2: Multicast Networking
-Modify this file to describe your project work.
+This program uses UDP over ARGON.net
+to connect with Chris Garibay's port and then
+finds the modulo as being either true or false.
+Just run the server and the corresponding receiver.
+Also included are two screenshots to verify
+send and receive capabilities.
-Typical deliverables include properly packages source, execution log, and screen shots as appropriate.
-
-References include
-* [README.md](../README.md) for this homework project.
-* [README.md](../../../../README.md) for course assignments execution instructions.
-* [assignments source subdirectories](../../../../../assignments/src) show examples from previous cohorts.
-
-Questions and innovation are always welcome, good luck!
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/receiving screenshot.png b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/receiving screenshot.png
new file mode 100644
index 0000000000000000000000000000000000000000..b92d41084c8cc01b4fce816f91a2e5d1d2cfb467
Binary files /dev/null and b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/receiving screenshot.png differ
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/sendingscreenshot.png b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/sendingscreenshot.png
new file mode 100644
index 0000000000000000000000000000000000000000..cbb912bab6c489924bd319693efa221e551c5fcc
Binary files /dev/null and b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Mahan/sendingscreenshot.png differ
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md
index 3a859295470542c1556ab765d4308ff2a1cbe794..3ec21e2b976a5937ab94a80cb4028ccb79441eae 100644
--- a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md
@@ -11,9 +11,29 @@ References include
Questions and innovation are always welcome, good luck!
+
+
+**************************************************
+Project for HW #3
+Team: "Germany" (Stefan and Bernd)
+**************************************************
+
+
+
This program(s) do(es) the following:
- send two numbers, a mathematical operator and a port number over VPN to a TCP receiver
- the TCP receiver calculates the result and send it back to the sender over VPN using UDP!
- the UDP receiver shows the result
+The main focus was to send via TCP over a VPN, do something and send the result back via UDP.
+
+How to run the project:
+0. connect both computer with the argon net
+1. run UDPResultReceiver on Bernd's computer
+2. run TCPNumberReceiverUDPResultSender on Stefan's computer
+3. find Stefan's IP within the argon net
+4. change the TCP_ARGON_SERVER_IP in class TCPNumberSender to Stefan's IP.
+5. run TCPNumberSender
+
+(you can edit the numbers and run TCPNumberSender multiple times...)
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/Screenshots.docx b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/Screenshots.docx
new file mode 100644
index 0000000000000000000000000000000000000000..ccb72d8a6b6bf96522119ec8837209f50fba9496
Binary files /dev/null and b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/Screenshots.docx differ
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/logic.jpg b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/logic.jpg
new file mode 100644
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diff --git a/examples/src/HttpServletExamples/HttpWebPageSource.java b/examples/src/HttpServletExamples/HttpWebPageSource.java
index c8777424a67e5e70c33f615e936fda8d09faefeb..97166ba5a0593ae53b1276d4e4377f454281d2cc 100644
--- a/examples/src/HttpServletExamples/HttpWebPageSource.java
+++ b/examples/src/HttpServletExamples/HttpWebPageSource.java
@@ -56,9 +56,9 @@ public class HttpWebPageSource {
// But a web server will write an unknown number of lines.
// So now we read until the transmisson ends.
- InputStream is = socket.getInputStream();
- InputStreamReader isr = new InputStreamReader(is);
- BufferedReader br = new BufferedReader(isr);
+ InputStream is = socket.getInputStream();
+ Reader isr = new InputStreamReader(is);
+ BufferedReader br = new BufferedReader(isr);
String line;
int count = 0;
@@ -72,8 +72,8 @@ public class HttpWebPageSource {
}
catch(IOException e)
{
- System.out.println("HttpWebPageSource: problem with client");
- System.out.println(e);
+ System.err.println("HttpWebPageSource: problem with client");
+ System.err.println(e);
}
}
}
diff --git a/examples/src/TcpExamples/TcpExample3Client.java b/examples/src/TcpExamples/TcpExample3Client.java
index a5841c8d2804b061eca53741ddd6943b9b660d74..cb346fa0833a42238dbbf1e723314ebbb7980126 100644
--- a/examples/src/TcpExamples/TcpExample3Client.java
+++ b/examples/src/TcpExamples/TcpExample3Client.java
@@ -22,7 +22,7 @@ public class TcpExample3Client {
public static void main(String[] args) {
// Local variables/fields
- Socket socket;
+ Socket socket = null;
InputStream is;
InputStreamReader isr;
BufferedReader br;
@@ -72,6 +72,11 @@ public class TcpExample3Client {
}
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("TcpExample3Client exit");
diff --git a/examples/src/UdpMulticastExamples/MulticastSender.java b/examples/src/UdpMulticastExamples/MulticastSender.java
index ef30a4d4f540144eff6b023d8761e143ab8f7be2..ef698d274c20274df27d411d240bcc451add523f 100644
--- a/examples/src/UdpMulticastExamples/MulticastSender.java
+++ b/examples/src/UdpMulticastExamples/MulticastSender.java
@@ -3,6 +3,8 @@ package UdpMulticastExamples;
import edu.nps.moves.dis7.utilities.DisThreadedNetIF;
import java.io.*;
import java.net.*;
+import java.util.logging.Level;
+import java.util.logging.Logger;
/**
* Looks a lot like UdpSender. Start this after launching MulticastReceiver.
@@ -28,11 +30,13 @@ public class MulticastSender {
public static final int LOOPSIZE = 20; // 20000
public static final String QUIT_SENTINEL = "QUIT QUIT QUIT!";
+ private static NetworkInterface ni;
@SuppressWarnings("SleepWhileInLoop")
public static void main(String[] args) throws IOException
{
MulticastSocket multicastSocket = null;
+ InetSocketAddress group = null;
// Put together a message with binary content. "ByteArrayOutputStream"
// is a java.io utility that lets us put together an array of binary
@@ -51,18 +55,18 @@ public class MulticastSender {
System.setProperty("java.net.preferIPv4Stack", "true");
// multicast group we are sending to--not a single host
- multicastSocket = new MulticastSocket(DESTINATION_PORT);
+ multicastSocket = new MulticastSocket(/*DESTINATION_PORT*/);
multicastSocket.setTimeToLive(TTL); // time to live reduces scope of transmission
InetAddress multicastAddress = InetAddress.getByName(MULTICAST_ADDRESS);
System.out.println("Multicast address/port: " + multicastAddress.getHostAddress() + "/" + DESTINATION_PORT);
- InetSocketAddress group = new InetSocketAddress(multicastAddress, DESTINATION_PORT);
+ group = new InetSocketAddress(multicastAddress, DESTINATION_PORT);
// Join group useful on receiving side
- multicastSocket.joinGroup(group, DisThreadedNetIF.findIpv4Interface());
+ multicastSocket.joinGroup(group, ni = DisThreadedNetIF.findIpv4Interface());
// You can join multiple groups here
byte[] buffer = baos.toByteArray();
- DatagramPacket packet = new DatagramPacket(buffer, buffer.length, multicastAddress, DESTINATION_PORT);
+ DatagramPacket packet = new DatagramPacket(buffer, buffer.length, group/*, DESTINATION_PORT*/);
for (int index = 0; index < LOOPSIZE; index++)
{
@@ -99,8 +103,14 @@ public class MulticastSender {
System.err.println(e);
} finally {
- if (multicastSocket != null)
+ if (multicastSocket != null && !multicastSocket.isClosed()) {
+ try {
+ multicastSocket.leaveGroup(group, ni);
+ } catch (IOException ex) {
+ Logger.getLogger(MulticastSender.class.getName()).log(Level.SEVERE, null, ex);
+ }
multicastSocket.close();
+ }
dos.close();
}