Main.java

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//    OpenVPN -- An application to securely tunnel IP networks
//               over a single port, with support for SSL/TLS-based
//               session authentication and key exchange,
//               packet encryption, packet authentication, and
//               packet compression.
//
//    Copyright (C) 2012- OpenVPN Inc.
//
//    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
 
// TESTING_ONLY
 
import java.io.*;
import java.nio.charset.Charset;
 
public class Main {
    // utility method to read a file and return as a String
    public static String readFile(String filename) throws IOException {
    return readStream(new FileInputStream(filename));
    }
 
    private static String readStream(InputStream stream) throws IOException {
    // No real need to close the BufferedReader/InputStreamReader
    // as they're only wrapping the stream
    try {
        Reader reader = new BufferedReader(new InputStreamReader(stream));
        StringBuilder builder = new StringBuilder();
        char[] buffer = new char[4096];
        int read;
        while ((read = reader.read(buffer, 0, buffer.length)) > 0) {
        builder.append(buffer, 0, read);
        }
        return builder.toString();
    } finally {
        // Potential issue here: if this throws an IOException,
        // it will mask any others. Normally I'd use a utility
        // method which would log exceptions and swallow them
        stream.close();
    }
    }
 
    public static void main(String[] args) throws IOException, Client.ConfigError, Client.CredsUnspecifiedError {
    if (args.length >= 1)
        {
        // load config file
        String config = readFile(args[0]);
 
        // get creds
        String username = "";
        String password = "";
        if (args.length >= 3)
            {
            username = args[1];
            password = args[2];
            }
 
        // instantiate client object
        final Client client = new Client(config, username, password);
 
        // catch signals
        final Thread mainThread = Thread.currentThread();
        Runtime.getRuntime().addShutdownHook(new Thread() {
            public void run() {
                client.stop();
                try {
                mainThread.join();
                }
                catch (InterruptedException e) {
                }
            }
            });
 
        // execute client session
        client.connect();
 
        // show stats before exit
        client.show_stats();
        }
    else
        {
        System.err.println("OpenVPN Java client");
        System.err.println("Usage: java Client <client.ovpn> [username] [password]");
        System.exit(2);
        }
    }
}