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src/Client.java

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+//This software is protected by Fedi6431© copyrights
+import java.io.*;
+import java.net.*;
+import java.util.Scanner;
+
+public class Client {
+    private Socket socket = null;
+    private DataInputStream input = null;
+    private DataOutputStream output = null;
+
+    public Client(String address, int port) {
+        try {
+            // establish a connection with the server
+            System.out.println("Made by Fedi6431");
+            System.out.println("Client started");
+            socket = new Socket(address, port);
+            System.out.println("Client connected");
+
+
+            // get input from the terminal
+            input = new DataInputStream(System.in);
+            // send output to the server socket
+            output = new DataOutputStream(socket.getOutputStream());
+
+
+            // string to read input
+            String line = "";
+            int user_system;
+            boolean linux;
+
+
+            // IP of the server and the client
+            String serverIP = socket.getLocalAddress().getHostAddress();
+            String clientIP = Inet4Address.getLocalHost().getHostAddress();
+
+
+            // ask the system that use the server to write custom payloads
+            System.out.println("\nChoose the system that using the server");
+            System.out.println("1 Linux");
+            System.out.println("2 Windows\n");
+            System.out.print("--> ");
+            Scanner scanner = new Scanner(System.in);
+            user_system = scanner.nextInt();
+
+            if (user_system == 1) {
+                linux = true;
+                output.writeUTF(String.valueOf(linux));
+            } else if (user_system == 2) {
+                linux = false;
+                output.writeUTF(String.valueOf(linux));
+            } else {
+                System.out.println("Syntax error, select one of the options");
+            }
+
+            // loop until "exit" is written
+            while (!line.equalsIgnoreCase("exit")) {
+                // get user input
+                System.out.print(clientIP + " to " + serverIP + "$-");
+                line = input.readLine();
+                // send the received input to the server
+                output.writeUTF(line);
+            }
+            // close the connection
+            input.close();
+            output.close();
+            socket.close();
+        }
+        // handle any errors
+        catch (IOException IOe) {
+            System.out.println("IO exception: " + IOe.getMessage());
+            System.out.println("Exception cause" + IOe.getCause());
+        }
+        catch (RuntimeException RTe) {
+            System.out.println("Runtime exception: " + RTe.getMessage());
+            System.out.println("Exception cause" + RTe.getCause());
+        }
+    }
+
+    public static void main(String args[]) {
+        Client client = new Client("127.0.0.1", 5000);
+    }
+}