diff --git a/projects/Assignments/2018JulySeptember/homework1/CainAssignment1.java b/projects/Assignments/2018JulySeptember/homework1/CainAssignment1.java new file mode 100644 index 0000000000000000000000000000000000000000..ff41a3c6df969e3f7f16b57b8a03bea186e80b2c --- /dev/null +++ b/projects/Assignments/2018JulySeptember/homework1/CainAssignment1.java @@ -0,0 +1,68 @@ +package CainAssignment1; + +import java.io.*; +import java.net.*; + +/** + * changed telnet # from 2317 to 2318. This won't affect the protocol handshake + * as long as client inputs the correct telnet #. + * + * telnet localhost 2318 + * + * ask for the ip address of the server + * <code>telnet ipOfServersLaptop 2318</code> + */ +public class CainAssignment1 { + + public static void main(String[] args) { + try { + int popularityCount = 0; // state + + ServerSocket serverSocket = new ServerSocket(2318); // 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) { + Socket clientConnection = serverSocket.accept(); // blocks! then proceeds once a connection is "accept"ed + + /** + * changed connectionCount to popularityCount + */ + popularityCount++; + + OutputStream os = clientConnection.getOutputStream(); + PrintStream ps = new PrintStream(os); + + ps.println("This client response was written by server CainAssignment1"); // to remote client + System.out.println("This server response was written by server CainAssignment1"); // to server console + + ps.println("You were connection #" + popularityCount + ", 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 )) + System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " + + remoteAddress.toString() + ", " + remotePort + " ))"); + System.out.println("you'er server is blowing up! Now serving #" + popularityCount); // report progress + + ps.flush(); + clientConnection.close(); + } + } catch (Exception e) { + /** + * added to the println for fun + */ + System.out.println("you got all sorts of problems with your networking: " + e); + } + } +} diff --git a/projects/Assignments/2018JulySeptember/homework1/FriscoTcpClient.java b/projects/Assignments/2018JulySeptember/homework1/FriscoTcpClient.java new file mode 100644 index 0000000000000000000000000000000000000000..9bbd8e0339d686547745e27c60a95ed0e28c3d72 --- /dev/null +++ b/projects/Assignments/2018JulySeptember/homework1/FriscoTcpClient.java @@ -0,0 +1,71 @@ + +import java.io.BufferedReader; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.OutputStream; +import java.io.PrintStream; +import java.net.Socket; + + +import java.io.*; +import java.net.*; +/* + * To change this license header, choose License Headers in Project Properties. + * To change this template file, choose Tools | Templates + * and open the template in the editor. + */ + +/** + * + * @author djfrisco + */ +public class FriscoTcpClient { + + public static void main(String[] args) + { + try + { + System.out.println("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 the Socket + // object; the server uses a ServerSocket to wait for + // connections. + Socket socket = new Socket("localhost", 2317); + + // Read the single line written by the server. We'd + // do things a bit differently if many lines to be read + // from the server, instead of one only. + InputStream is = socket.getInputStream(); + InputStreamReader isr = new InputStreamReader(is); + BufferedReader br = new BufferedReader(isr); + + String serverMessage = br.readLine(); + System.out.println("1 The message the server sent was " + serverMessage); + + // Outgoing Messages + OutputStream os = socket.getOutputStream(); + PrintStream ps = new PrintStream(os); + ps.println("bbb report: X, Y, X " + System.currentTimeMillis()); + + serverMessage = br.readLine(); + System.out.println("2 The message the server sent was " + serverMessage); + + //os = socket.getOutputStream(); + // ps = new PrintStream(os); + ps.println("Final message from client " + System.currentTimeMillis()); + serverMessage = br.readLine(); + System.out.println("3 The message the server sent was " + serverMessage); + + + } + catch(Exception e) + { + System.out.println(e); + System.out.println("Problem with client"); + } + + } +} + diff --git a/projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java b/projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java new file mode 100644 index 0000000000000000000000000000000000000000..e7d8f9b7902eab69ec6c6450fd302bae99828b73 --- /dev/null +++ b/projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java @@ -0,0 +1,93 @@ + +package FurrAssignment2; + +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. + * + * telnet localhost 2317 + * + * If you're sophisticated you can contact the instructor's computer + * while running this program. + * + * telnet <ipOfServersLaptop> 2317 + * + * And have him display the socket pairs he got. + * @author mcgredo + */ +public class FurrAssignment2 +{ + + 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. + + int connectionCount = 0; // state + for(int i=2317; i<10; i++){ + ServerSocket serverSocket = new ServerSocket(i); + System.out.println("server established for port #" +i); + } + + // Loop, infinitely, waiting for client connections. + // Stop the program somewhere else. + while(true) + { + Socket clientConnection = serverSocket.accept(); // blocks! then proceeds once a connection is "accept"ed + + connectionCount++; // got another one! + + OutputStream os = clientConnection.getOutputStream(); + PrintStream ps = new PrintStream(os); + + ps.println("This client response was written by server TcpExample2"); // to remote client + System.out.println("This server response was written by server TcpExample2"); // to server console + + // 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(); + + // 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("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(); + clientConnection.close(); + } + } + catch(Exception e) + { + System.out.println("problem with networking: " + e); + } + + } + +} diff --git a/projects/Assignments/2018JulySeptember/homework2/README.md b/projects/Assignments/2018JulySeptember/homework2/README.md new file mode 100644 index 0000000000000000000000000000000000000000..c16552e9cd7cc83b96e35f523a821f4d98bbcee0 --- /dev/null +++ b/projects/Assignments/2018JulySeptember/homework2/README.md @@ -0,0 +1,11 @@ +## Homework 2 + +Deliverables: + +0. Think of a simple challenge/response protocol that you wish to portray. +1. Apply your own customized version of Assignment 3 showing both Server and Client programs. +2. Include comments describing your modifications. +3. Include documentation of one or more sessions, including operation. +4. Create a simple illustration of the communications exchange in a UML Sequence Diagram. + +Please see the [README.md](../../README.md) in the Assignments directory for detailed instructions. \ No newline at end of file