1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.IOException; 25 import java.net.ServerSocket; 26 import java.net.Socket; 27 import java.util.Objects; 28 import java.util.function.Consumer; 29 30 import javax.net.ServerSocketFactory; 31 32 /* 33 * A simple socks4 proxy for traveling socket. 34 */ 35 class SocksProxy implements Runnable, AutoCloseable { 36 37 private ServerSocket server; 38 private Consumer<Socket> socketConsumer; 39 40 private SocksProxy(ServerSocket server, Consumer<Socket> socketConsumer) { 41 this.server = server; 42 this.socketConsumer = socketConsumer; 43 } 44 45 static SocksProxy startProxy(Consumer<Socket> socketConsumer) 46 throws IOException { 47 Objects.requireNonNull(socketConsumer, "socketConsumer cannot be null"); 48 49 ServerSocket server 50 = ServerSocketFactory.getDefault().createServerSocket(0); 51 52 System.setProperty("socksProxyHost", "127.0.0.1"); 53 System.setProperty("socksProxyPort", 54 String.valueOf(server.getLocalPort())); 55 System.setProperty("socksProxyVersion", "4"); 56 57 SocksProxy proxy = new SocksProxy(server, socketConsumer); 58 Thread proxyThread = new Thread(proxy, "Proxy"); 59 proxyThread.setDaemon(true); 60 proxyThread.start(); 61 62 return proxy; 63 } 64 65 @Override 66 public void run() { 67 while (!server.isClosed()) { 68 try(Socket socket = server.accept()) { 69 System.out.println("Server: accepted connection"); 70 if (socketConsumer != null) { 71 socketConsumer.accept(socket); 72 } 73 } catch (IOException e) { 74 if (!server.isClosed()) { 75 throw new RuntimeException( 76 "Server: accept connection failed", e); 77 } else { 78 System.out.println("Server is closed."); 79 } 80 } 81 } 82 } 83 84 @Override 85 public void close() throws Exception { 86 if (!server.isClosed()) { 87 server.close(); 88 } 89 } 90 91 int getPort() { 92 return server.getLocalPort(); 93 } 94 }