├── happi.gif ├── client_logs.db ├── server_logs.db ├── src ├── client_logs.db ├── server_logs.db ├── main │ └── resources │ │ └── logback.xml ├── LogReaderGUI.java ├── VPNServer.java └── VPNClientGUI.java ├── out └── production │ └── VPN-GUI │ ├── client_logs.db │ ├── server_logs.db │ ├── VPNServer.class │ ├── LogReaderGUI.class │ ├── VPNClientGUI.class │ ├── VPNServer$ServerWorker.class │ └── main │ └── resources │ └── logback.xml ├── VPN-GUI.iml ├── README.md └── LICENSE /happi.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/happi.gif -------------------------------------------------------------------------------- /client_logs.db: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/client_logs.db -------------------------------------------------------------------------------- /server_logs.db: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/server_logs.db -------------------------------------------------------------------------------- /src/client_logs.db: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/src/client_logs.db -------------------------------------------------------------------------------- /src/server_logs.db: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/src/server_logs.db -------------------------------------------------------------------------------- /out/production/VPN-GUI/client_logs.db: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/out/production/VPN-GUI/client_logs.db -------------------------------------------------------------------------------- /out/production/VPN-GUI/server_logs.db: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/out/production/VPN-GUI/server_logs.db -------------------------------------------------------------------------------- /out/production/VPN-GUI/VPNServer.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/out/production/VPN-GUI/VPNServer.class -------------------------------------------------------------------------------- /out/production/VPN-GUI/LogReaderGUI.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/out/production/VPN-GUI/LogReaderGUI.class -------------------------------------------------------------------------------- /out/production/VPN-GUI/VPNClientGUI.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/out/production/VPN-GUI/VPNClientGUI.class -------------------------------------------------------------------------------- /out/production/VPN-GUI/VPNServer$ServerWorker.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nxvvvv/simple-java-vpn/HEAD/out/production/VPN-GUI/VPNServer$ServerWorker.class -------------------------------------------------------------------------------- /src/main/resources/logback.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /out/production/VPN-GUI/main/resources/logback.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /VPN-GUI.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Simple Java VPN Implementation 2 | 3 | ## Server 4 | The `VPNServer` Java application serves as the server-side component of a virtual private network (VPN) system. It establishes a connection to the VPN client, exchanges a secret key, and securely transmits encrypted data. The server's functionality is encapsulated in the `VPNClientGUI` class. To set up the server, ensure that you have the SQLite JDBC library imported into IntelliJ IDEA. Compile and run the `VPNClientGUI` class. The server logs are stored in the "client_logs.db" SQLite database in the "client_logs" table. These logs are displayed in a graphical user interface (GUI) for real-time monitoring. 5 | 6 | ## Client 7 | The `VPNClient` Java application acts as the client-side component of the VPN system. It connects to the server, exchanges a secret key, receives encrypted data, decrypts it, and displays the decrypted GIF. The client's functionality is implemented in the `VPNClientGUI` class. To run the client, make sure to import the SQLite JDBC library in IntelliJ IDEA, build, and execute the `VPNClientGUI` class. The client logs are stored in the "client_logs.db" SQLite database in the "client_logs" table. The GUI provides a clear view of the communication process and decrypts and displays the received GIF. 8 | 9 | ## LogReader 10 | The `LogReader` Java application, represented by the `LogReaderGUI` class, serves as a log reader for both the server and client. It allows users to view logs from both the "server_logs.db" and "client_logs.db" databases in the "server_logs" and "client_logs" tables, respectively. To run the LogReader, import the SQLite JDBC library in IntelliJ IDEA, build, and execute the `LogReaderGUI` class. The GUI displays logs in a user-friendly interface, enabling efficient monitoring and troubleshooting. 11 | 12 | ### How to Run: 13 | 1. Open IntelliJ IDEA. 14 | 2. Import the SQLite JDBC library. 15 | 3. Build and run the `VPNClientGUI` class to start the VPN client. 16 | 4. Build and run the `VPNServerGUI` class to start the VPN server. 17 | 5. Build and run the `LogReaderGUI` class to open the log reader. 18 | 6. The log reader GUI will display logs from both the client and server databases. 19 | 20 | Ensure that the dependencies are resolved, and the SQLite JDBC driver is correctly imported. This setup provides a seamless integration for secure communication between the VPN client and server, with logs conveniently accessible through the LogReader GUI. Make sure to comply to the [LICENSE](https://github.com/nxvvvv/simple-java-vpn/LICENSE) before re-uploading or using my code elsewhere. 21 | -------------------------------------------------------------------------------- /src/LogReaderGUI.java: -------------------------------------------------------------------------------- 1 | import javax.swing.*; 2 | import java.awt.*; 3 | import java.awt.event.ActionEvent; 4 | import java.io.File; 5 | import java.sql.Connection; 6 | import java.sql.DriverManager; 7 | import java.sql.PreparedStatement; 8 | import java.sql.ResultSet; 9 | 10 | public class LogReaderGUI extends JFrame { 11 | 12 | private JTextArea logArea; 13 | private JButton clientLogsButton; 14 | private JButton serverLogsButton; 15 | 16 | public LogReaderGUI() { 17 | super("Log Reader"); 18 | 19 | // Layout 20 | setLayout(new BorderLayout()); 21 | 22 | // Log Area 23 | logArea = new JTextArea(); 24 | logArea.setEditable(false); 25 | logArea.setFont(new Font("Monospaced", Font.PLAIN, 12)); 26 | 27 | JScrollPane scrollPane = new JScrollPane(logArea); 28 | scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 29 | 30 | add(scrollPane, BorderLayout.CENTER); 31 | 32 | // Buttons 33 | clientLogsButton = new JButton("Client Logs"); 34 | serverLogsButton = new JButton("Server Logs"); 35 | 36 | clientLogsButton.addActionListener(e -> fetchClientLogsAndDisplay()); 37 | serverLogsButton.addActionListener(e -> fetchServerLogsAndDisplay()); 38 | 39 | JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); 40 | buttonPanel.add(clientLogsButton); 41 | buttonPanel.add(serverLogsButton); 42 | 43 | add(buttonPanel, BorderLayout.SOUTH); 44 | 45 | // Frame Settings 46 | setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 47 | setSize(500, 400); 48 | setLocationRelativeTo(null); 49 | setVisible(true); 50 | 51 | // Initially fetch client logs 52 | fetchClientLogsAndDisplay(); 53 | } 54 | 55 | private void fetchClientLogsAndDisplay() { 56 | fetchLogsAndDisplay("client_logs.db", "client_logs"); 57 | } 58 | 59 | private void fetchServerLogsAndDisplay() { 60 | fetchLogsAndDisplay("server_logs.db", "server_logs"); 61 | } 62 | 63 | private void fetchLogsAndDisplay(String fileName, String tableName) { 64 | logArea.setText(""); // Clear existing logs 65 | 66 | try { 67 | // Load SQLite JDBC driver 68 | Class.forName("org.sqlite.JDBC"); 69 | 70 | // Construct the absolute path to the database file 71 | String dbUrl = "jdbc:sqlite:" + fileName; 72 | 73 | // Connect to the SQLite database 74 | Connection connection = DriverManager.getConnection(dbUrl); 75 | 76 | // Query to retrieve logs 77 | String query = "SELECT * FROM " + tableName; 78 | 79 | // Prepare the statement 80 | PreparedStatement preparedStatement = connection.prepareStatement(query); 81 | 82 | // Execute the query 83 | ResultSet resultSet = preparedStatement.executeQuery(); 84 | 85 | // Display logs in the GUI 86 | while (resultSet.next()) { 87 | String logMessage = resultSet.getString("log_message"); 88 | String timestamp = resultSet.getString("timestamp"); 89 | logArea.append("[" + timestamp + "] " + logMessage + "\n"); 90 | } 91 | 92 | // Close the resources 93 | resultSet.close(); 94 | preparedStatement.close(); 95 | connection.close(); 96 | 97 | } catch (Exception e) { 98 | e.printStackTrace(); 99 | } 100 | } 101 | 102 | 103 | 104 | 105 | 106 | 107 | public static void main(String[] args) { 108 | SwingUtilities.invokeLater(() -> { 109 | new LogReaderGUI(); 110 | }); 111 | } 112 | } 113 | -------------------------------------------------------------------------------- /src/VPNServer.java: -------------------------------------------------------------------------------- 1 | import javax.crypto.Cipher; 2 | import javax.crypto.CipherOutputStream; 3 | import javax.crypto.SecretKey; 4 | import javax.swing.*; 5 | import java.awt.*; 6 | import java.io.IOException; 7 | import java.io.ObjectInputStream; 8 | import java.io.OutputStream; 9 | import java.net.ServerSocket; 10 | import java.net.Socket; 11 | import java.nio.file.Files; 12 | import java.nio.file.Paths; 13 | import java.sql.Connection; 14 | import java.sql.DriverManager; 15 | import java.sql.PreparedStatement; 16 | import java.sql.SQLException; 17 | 18 | public class VPNServer extends JFrame { 19 | private static final int SERVER_PORT = 8888; 20 | private static final String GIF_FILE_PATH = "happi.gif"; 21 | private static final String DATABASE_URL = "jdbc:sqlite:server_logs.db"; 22 | private Connection connection; 23 | 24 | private JTextArea logArea; 25 | private JButton startButton; 26 | private JButton stopButton; 27 | private ServerSocket serverSocket; 28 | private ServerWorker serverWorker; 29 | 30 | public VPNServer() { 31 | super("VPN Server"); 32 | 33 | // Initialize the database connection 34 | try { 35 | connection = DriverManager.getConnection(DATABASE_URL); 36 | initializeDatabase(); 37 | } catch (SQLException e) { 38 | logError("Error connecting to the database: " + e.getMessage()); 39 | e.printStackTrace(); 40 | } 41 | 42 | // Layout 43 | setLayout(new BorderLayout()); 44 | 45 | // Log Area 46 | logArea = new JTextArea(); 47 | logArea.setEditable(false); 48 | logArea.setFont(new Font("Monospaced", Font.PLAIN, 12)); 49 | 50 | JScrollPane scrollPane = new JScrollPane(logArea); 51 | scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 52 | 53 | add(scrollPane, BorderLayout.CENTER); 54 | 55 | // Start and Stop Buttons 56 | startButton = new JButton("Start Server"); 57 | startButton.addActionListener(e -> startServer()); 58 | 59 | stopButton = new JButton("Stop Server"); 60 | stopButton.addActionListener(e -> stopServer()); 61 | 62 | JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); 63 | buttonPanel.add(startButton); 64 | buttonPanel.add(stopButton); 65 | 66 | add(buttonPanel, BorderLayout.SOUTH); 67 | 68 | // Frame Settings 69 | setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 70 | setSize(500, 400); 71 | setLocationRelativeTo(null); 72 | setVisible(true); 73 | } 74 | 75 | private void initializeDatabase() { 76 | String createTableQuery = "CREATE TABLE IF NOT EXISTS server_logs (id INTEGER PRIMARY KEY AUTOINCREMENT, log_message TEXT, timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP)"; 77 | try (PreparedStatement preparedStatement = connection.prepareStatement(createTableQuery)) { 78 | preparedStatement.executeUpdate(); 79 | } catch (SQLException e) { 80 | logError("Error initializing the database: " + e.getMessage()); 81 | e.printStackTrace(); 82 | } 83 | } 84 | 85 | 86 | 87 | private void insertLogMessage(String message) { 88 | String insertLogQuery = "INSERT INTO server_logs (log_message, timestamp) VALUES (?, CURRENT_TIMESTAMP)"; 89 | try (PreparedStatement preparedStatement = connection.prepareStatement(insertLogQuery)) { 90 | preparedStatement.setString(1, message); 91 | preparedStatement.executeUpdate(); 92 | } catch (SQLException e) { 93 | // Log the error without calling insertLogMessage again 94 | System.err.println("Error inserting log message into the database: " + e.getMessage()); 95 | e.printStackTrace(); 96 | } 97 | } 98 | 99 | 100 | 101 | private void startServer() { 102 | log("Starting VPN Server..."); 103 | startButton.setEnabled(false); 104 | stopButton.setEnabled(true); 105 | 106 | serverWorker = new ServerWorker(); 107 | serverWorker.execute(); 108 | } 109 | 110 | private void stopServer() { 111 | log("Stopping VPN Server..."); 112 | stopButton.setEnabled(false); 113 | startButton.setEnabled(true); 114 | 115 | if (serverWorker != null && !serverWorker.isDone()) { 116 | serverWorker.cancel(true); 117 | } 118 | 119 | if (serverSocket != null && !serverSocket.isClosed()) { 120 | try { 121 | serverSocket.close(); 122 | log("VPN Server stopped."); 123 | } catch (IOException e) { 124 | logError("Error stopping server: " + e.getMessage()); 125 | e.printStackTrace(); 126 | } 127 | } else { 128 | log("VPN Server is not running."); 129 | } 130 | } 131 | 132 | private void encryptAndSendData(byte[] data, SecretKey secretKey, Socket socket) { 133 | try { 134 | Cipher cipher = Cipher.getInstance("AES"); 135 | cipher.init(Cipher.ENCRYPT_MODE, secretKey); 136 | byte[] encryptedBytes = cipher.doFinal(data); 137 | 138 | try (OutputStream outputStream = socket.getOutputStream(); 139 | CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, cipher)) { 140 | cipherOutputStream.write(encryptedBytes); 141 | } 142 | } catch (Exception e) { 143 | throw new RuntimeException("Error encrypting and sending data", e); 144 | } 145 | } 146 | 147 | private void log(String message) { 148 | String logMessage = "[INFO][" + java.time.LocalTime.now() + "] " + message; 149 | logArea.append(logMessage + "\n"); 150 | logArea.setCaretPosition(logArea.getDocument().getLength()); 151 | insertLogMessage(logMessage); // Insert log message into the database 152 | } 153 | 154 | private void logError(String message) { 155 | String errorMessage = "[ERROR][" + java.time.LocalTime.now() + "] " + message; 156 | logArea.append(errorMessage + "\n"); 157 | logArea.setCaretPosition(logArea.getDocument().getLength()); 158 | insertLogMessage(errorMessage); // Insert error message into the database 159 | } 160 | 161 | private class ServerWorker extends SwingWorker { 162 | @Override 163 | protected Void doInBackground() throws Exception { 164 | try { 165 | serverSocket = new ServerSocket(SERVER_PORT); 166 | log("VPN Server started on port " + SERVER_PORT); 167 | 168 | while (!isCancelled()) { 169 | try (Socket socket = serverSocket.accept(); 170 | ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream())) { 171 | 172 | log("Client connected: " + socket.getInetAddress().getHostAddress()); 173 | SecretKey secretKey = (SecretKey) inputStream.readObject(); 174 | 175 | byte[] gifBytes = Files.readAllBytes(Paths.get(GIF_FILE_PATH)); 176 | encryptAndSendData(gifBytes, secretKey, socket); 177 | } 178 | } 179 | } catch (IOException | ClassNotFoundException e) { 180 | if (!isCancelled()) { 181 | logError("Error: " + e.getMessage()); 182 | e.printStackTrace(); 183 | } 184 | } 185 | return null; 186 | } 187 | 188 | @Override 189 | protected void done() { 190 | stopServer(); 191 | } 192 | } 193 | 194 | public static void main(String[] args) { 195 | // Load the SQLite JDBC driver 196 | try { 197 | Class.forName("org.sqlite.JDBC"); 198 | } catch (ClassNotFoundException e) { 199 | e.printStackTrace(); 200 | System.exit(1); 201 | } 202 | 203 | SwingUtilities.invokeLater(VPNServer::new); 204 | } 205 | } 206 | -------------------------------------------------------------------------------- /src/VPNClientGUI.java: -------------------------------------------------------------------------------- 1 | import javax.swing.*; 2 | import java.awt.*; 3 | import java.io.*; 4 | import java.net.Socket; 5 | import javax.crypto.Cipher; 6 | import javax.crypto.CipherInputStream; 7 | import javax.crypto.KeyGenerator; 8 | import javax.crypto.SecretKey; 9 | import java.sql.Connection; 10 | import java.sql.DriverManager; 11 | import java.sql.PreparedStatement; 12 | import java.sql.SQLException; 13 | import java.time.LocalTime; 14 | 15 | public class VPNClientGUI extends JFrame { 16 | private static final String SERVER_ADDRESS = "127.0.0.1"; 17 | private static final int SERVER_PORT = 8888; 18 | private static final String DATABASE_URL = "jdbc:sqlite:client_logs.db"; 19 | private Connection connection; 20 | 21 | private JTextArea logArea; 22 | private JButton connectButton; 23 | 24 | public VPNClientGUI() { 25 | super("VPN Client"); 26 | 27 | // Initialize the database connection 28 | try { 29 | connection = DriverManager.getConnection(DATABASE_URL); 30 | initializeDatabase(); 31 | } catch (SQLException e) { 32 | logError("Error connecting to the database: " + e.getMessage()); 33 | e.printStackTrace(); 34 | } 35 | 36 | // Layout 37 | setLayout(new BorderLayout()); 38 | 39 | // Log Area 40 | logArea = new JTextArea(); 41 | logArea.setEditable(false); 42 | logArea.setFont(new Font("Monospaced", Font.PLAIN, 12)); 43 | 44 | JScrollPane scrollPane = new JScrollPane(logArea); 45 | scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 46 | 47 | add(scrollPane, BorderLayout.CENTER); 48 | 49 | // Connect Button 50 | connectButton = new JButton("Connect to Server"); 51 | connectButton.addActionListener(e -> connectToServer()); 52 | 53 | JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); 54 | buttonPanel.add(connectButton); 55 | 56 | add(buttonPanel, BorderLayout.SOUTH); 57 | 58 | // Frame Settings 59 | setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 60 | setSize(500, 400); 61 | setLocationRelativeTo(null); 62 | setResizable(false); 63 | setVisible(true); 64 | } 65 | 66 | private void initializeDatabase() { 67 | String createTableQuery = "CREATE TABLE IF NOT EXISTS client_logs (id INTEGER PRIMARY KEY AUTOINCREMENT, log_message TEXT, timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP)"; 68 | try (PreparedStatement preparedStatement = connection.prepareStatement(createTableQuery)) { 69 | preparedStatement.executeUpdate(); 70 | } catch (SQLException e) { 71 | logError("Error initializing the database: " + e.getMessage()); 72 | e.printStackTrace(); 73 | } 74 | } 75 | 76 | 77 | private void insertLogMessage(String message) { 78 | String insertLogQuery = "INSERT INTO client_logs (log_message, timestamp) VALUES (?, CURRENT_TIMESTAMP)"; 79 | try (PreparedStatement preparedStatement = connection.prepareStatement(insertLogQuery)) { 80 | preparedStatement.setString(1, message); 81 | preparedStatement.executeUpdate(); 82 | } catch (SQLException e) { 83 | logError("Error inserting log message into the database: " + e.getMessage()); 84 | e.printStackTrace(); 85 | } 86 | } 87 | 88 | private void connectToServer() { 89 | try { 90 | log("Connecting to the server..."); 91 | Socket socket = new Socket(SERVER_ADDRESS, SERVER_PORT); 92 | log("Connected to the server."); 93 | 94 | KeyGenerator keyGen = KeyGenerator.getInstance("AES"); 95 | keyGen.init(128); 96 | SecretKey secretKey = keyGen.generateKey(); 97 | 98 | log("Sending secret key to the server..."); 99 | ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream()); 100 | outputStream.writeObject(secretKey); 101 | log("Secret key sent to the server."); 102 | 103 | log("Receiving encrypted data from the server..."); 104 | InputStream inputStream = socket.getInputStream(); 105 | Cipher cipher = Cipher.getInstance("AES"); 106 | cipher.init(Cipher.DECRYPT_MODE, secretKey); 107 | CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher); 108 | 109 | byte[] gifBytes = cipherInputStream.readAllBytes(); 110 | log("Received encrypted GIF data from the server."); 111 | 112 | log("Decrypting data and displaying GIF..."); 113 | displayDecryptedGIF(gifBytes, secretKey); 114 | 115 | cipherInputStream.close(); 116 | outputStream.close(); 117 | socket.close(); 118 | } catch (Exception e) { 119 | logError("Error: " + e.getMessage()); 120 | e.printStackTrace(); 121 | } 122 | } 123 | 124 | private void displayDecryptedGIF(byte[] gifBytes, SecretKey secretKey) { 125 | try { 126 | Cipher cipher = Cipher.getInstance("AES"); 127 | cipher.init(Cipher.DECRYPT_MODE, secretKey); 128 | byte[] decryptedBytes = cipher.doFinal(gifBytes); 129 | 130 | // Display the decrypted GIF 131 | ImageIcon imageIcon = new ImageIcon(decryptedBytes); 132 | JLabel gifLabel = new JLabel(imageIcon); 133 | 134 | JFrame gifFrame = new JFrame("Decrypted GIF"); 135 | gifFrame.getContentPane().add(gifLabel, BorderLayout.CENTER); 136 | gifFrame.setSize(400, 400); 137 | gifFrame.setLocationRelativeTo(this); 138 | gifFrame.setResizable(false); 139 | gifFrame.setVisible(true); 140 | 141 | log("GIF decrypted and displayed."); 142 | } catch (Exception e) { 143 | logError("Error decrypting GIF data: " + e.getMessage()); 144 | e.printStackTrace(); 145 | } 146 | } 147 | 148 | private boolean insertIntoDatabase = true; // Flag to control recursive calls 149 | 150 | private void insertLogIntoDatabase(String message) { 151 | if (insertIntoDatabase) { 152 | String insertLogQuery = "INSERT INTO client_logs (log_message, timestamp) VALUES (?, CURRENT_TIMESTAMP)"; 153 | try (PreparedStatement preparedStatement = connection.prepareStatement(insertLogQuery)) { 154 | preparedStatement.setString(1, message); 155 | preparedStatement.executeUpdate(); 156 | } catch (SQLException e) { 157 | logError("Error inserting log message into the database: " + e.getMessage()); 158 | e.printStackTrace(); 159 | } 160 | } 161 | } 162 | 163 | // Modify the log and logError methods 164 | private void log(String message) { 165 | String logMessage = "[INFO][" + LocalTime.now() + "] " + message; 166 | logArea.append(logMessage + "\n"); 167 | logArea.setCaretPosition(logArea.getDocument().getLength()); 168 | insertLogIntoDatabase(logMessage); // Insert log message into the database 169 | } 170 | 171 | private void logError(String message) { 172 | String errorMessage = "[ERROR][" + LocalTime.now() + "] " + message; 173 | logArea.append(errorMessage + "\n"); 174 | logArea.setCaretPosition(logArea.getDocument().getLength()); 175 | insertIntoDatabase = false; // Disable database insertion to prevent recursion 176 | insertLogIntoDatabase(errorMessage); 177 | insertIntoDatabase = true; // Re-enable database insertion 178 | } 179 | 180 | private void insertLogIntoDatabaseWithoutError(String message) { 181 | String insertLogQuery = "INSERT INTO client_logs (log_message, timestamp) VALUES (?, CURRENT_TIMESTAMP)"; 182 | try (PreparedStatement preparedStatement = connection.prepareStatement(insertLogQuery)) { 183 | preparedStatement.setString(1, message); 184 | preparedStatement.executeUpdate(); 185 | } catch (SQLException e) { 186 | logError("Error inserting log message into the database: " + e.getMessage()); 187 | e.printStackTrace(); 188 | } 189 | } 190 | 191 | public static void main(String[] args) { 192 | // Load the SQLite JDBC driver 193 | try { 194 | Class.forName("org.sqlite.JDBC"); 195 | } catch (ClassNotFoundException e) { 196 | e.printStackTrace(); 197 | System.exit(1); 198 | } 199 | 200 | SwingUtilities.invokeLater(VPNClientGUI::new); 201 | } 202 | } 203 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Patents. 460 | 461 | A "contributor" is a copyright holder who authorizes use under this 462 | License of the Program or a work on which the Program is based. The 463 | work thus licensed is called the contributor's "contributor version". 464 | 465 | A contributor's "essential patent claims" are all patent claims 466 | owned or controlled by the contributor, whether already acquired or 467 | hereafter acquired, that would be infringed by some manner, permitted 468 | by this License, of making, using, or selling its contributor version, 469 | but do not include claims that would be infringed only as a 470 | consequence of further modification of the contributor version. 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Remote Network Interaction; Use with the GNU General Public License. 541 | 542 | Notwithstanding any other provision of this License, if you modify the 543 | Program, your modified version must prominently offer all users 544 | interacting with it remotely through a computer network (if your version 545 | supports such interaction) an opportunity to receive the Corresponding 546 | Source of your version by providing access to the Corresponding Source 547 | from a network server at no charge, through some standard or customary 548 | means of facilitating copying of software. This Corresponding Source 549 | shall include the Corresponding Source for any work covered by version 3 550 | of the GNU General Public License that is incorporated pursuant to the 551 | following paragraph. 552 | 553 | Notwithstanding any other provision of this License, you have 554 | permission to link or combine any covered work with a work licensed 555 | under version 3 of the GNU General Public License into a single 556 | combined work, and to convey the resulting work. The terms of this 557 | License will continue to apply to the part which is the covered work, 558 | but the work with which it is combined will remain governed by version 559 | 3 of the GNU General Public License. 560 | 561 | 14. Revised Versions of this License. 562 | 563 | The Free Software Foundation may publish revised and/or new versions of 564 | the GNU Affero General Public License from time to time. Such new versions 565 | will be similar in spirit to the present version, but may differ in detail to 566 | address new problems or concerns. 567 | 568 | Each version is given a distinguishing version number. If the 569 | Program specifies that a certain numbered version of the GNU Affero General 570 | Public License "or any later version" applies to it, you have the 571 | option of following the terms and conditions either of that numbered 572 | version or of any later version published by the Free Software 573 | Foundation. If the Program does not specify a version number of the 574 | GNU Affero General Public License, you may choose any version ever published 575 | by the Free Software Foundation. 576 | 577 | If the Program specifies that a proxy can decide which future 578 | versions of the GNU Affero General Public License can be used, that proxy's 579 | public statement of acceptance of a version permanently authorizes you 580 | to choose that version for the Program. 581 | 582 | Later license versions may give you additional or different 583 | permissions. However, no additional obligations are imposed on any 584 | author or copyright holder as a result of your choosing to follow a 585 | later version. 586 | 587 | 15. Disclaimer of Warranty. 588 | 589 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 590 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 591 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 592 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 593 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 594 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 595 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 596 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 597 | 598 | 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | --------------------------------------------------------------------------------