1  //    OpenVPN -- An application to securely tunnel IP networks
 2  //               over a single port, with support for SSL/TLS-based
 3  //               session authentication and key exchange,
 4  //               packet encryption, packet authentication, and
 5  //               packet compression.
 6  //
 7  //    Copyright (C) 2012- OpenVPN Inc.
 8  //
 9  //    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
10  //
11  
12  // TESTING_ONLY
13  
14  import java.io.*;
15  import java.nio.charset.Charset;
16  
17  public class Main {
18      // utility method to read a file and return as a String
19      public static String readFile(String filename) throws IOException {
20  	return readStream(new FileInputStream(filename));
21      }
22  
23      private static String readStream(InputStream stream) throws IOException {
24  	// No real need to close the BufferedReader/InputStreamReader
25  	// as they're only wrapping the stream
26  	try {
27  	    Reader reader = new BufferedReader(new InputStreamReader(stream));
28  	    StringBuilder builder = new StringBuilder();
29  	    char[] buffer = new char[4096];
30  	    int read;
31  	    while ((read = reader.read(buffer, 0, buffer.length)) > 0) {
32  		builder.append(buffer, 0, read);
33  	    }
34  	    return builder.toString();
35  	} finally {
36  	    // Potential issue here: if this throws an IOException,
37  	    // it will mask any others. Normally I'd use a utility
38  	    // method which would log exceptions and swallow them
39  	    stream.close();
40  	}
41      }
42  
43      public static void main(String[] args) throws IOException, Client.ConfigError, Client.CredsUnspecifiedError {
44  	if (args.length >= 1)
45  	    {
46  		// load config file
47  		String config = readFile(args[0]);
48  
49  		// get creds
50  		String username = "";
51  		String password = "";
52  		if (args.length >= 3)
53  		    {
54  			username = args[1];
55  			password = args[2];
56  		    }
57  
58  		// instantiate client object
59  		final Client client = new Client(config, username, password);
60  
61  		// catch signals
62  		final Thread mainThread = Thread.currentThread();
63  		Runtime.getRuntime().addShutdownHook(new Thread() {
64  			public void run() {
65  			    client.stop();
66  			    try {
67  				mainThread.join();
68  			    }
69  			    catch (InterruptedException e) {
70  			    }
71  			}
72  		    });
73  
74  		// execute client session
75  		client.connect();
76  
77  		// show stats before exit
78  		client.show_stats();
79  	    }
80  	else
81  	    {
82  		System.err.println("OpenVPN Java client");
83  		System.err.println("Usage: java Client <client.ovpn> [username] [password]");
84  		System.exit(2);
85  	    }
86      }
87  }