| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.io.IOException; |
| import java.net.ServerSocket; |
| import java.net.Socket; |
| import java.util.Objects; |
| import java.util.function.Consumer; |
| |
| import javax.net.ServerSocketFactory; |
| |
| /* |
| * A simple socks4 proxy for traveling socket. |
| */ |
| class SocksProxy implements Runnable, AutoCloseable { |
| |
| private ServerSocket server; |
| private Consumer<Socket> socketConsumer; |
| |
| private SocksProxy(ServerSocket server, Consumer<Socket> socketConsumer) { |
| this.server = server; |
| this.socketConsumer = socketConsumer; |
| } |
| |
| static SocksProxy startProxy(Consumer<Socket> socketConsumer) |
| throws IOException { |
| Objects.requireNonNull(socketConsumer, "socketConsumer cannot be null"); |
| |
| ServerSocket server |
| = ServerSocketFactory.getDefault().createServerSocket(0); |
| |
| System.setProperty("socksProxyHost", "127.0.0.1"); |
| System.setProperty("socksProxyPort", |
| String.valueOf(server.getLocalPort())); |
| System.setProperty("socksProxyVersion", "4"); |
| |
| SocksProxy proxy = new SocksProxy(server, socketConsumer); |
| Thread proxyThread = new Thread(proxy, "Proxy"); |
| proxyThread.setDaemon(true); |
| proxyThread.start(); |
| |
| return proxy; |
| } |
| |
| @Override |
| public void run() { |
| while (!server.isClosed()) { |
| try(Socket socket = server.accept()) { |
| System.out.println("Server: accepted connection"); |
| if (socketConsumer != null) { |
| socketConsumer.accept(socket); |
| } |
| } catch (IOException e) { |
| if (!server.isClosed()) { |
| throw new RuntimeException( |
| "Server: accept connection failed", e); |
| } else { |
| System.out.println("Server is closed."); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void close() throws Exception { |
| if (!server.isClosed()) { |
| server.close(); |
| } |
| } |
| |
| int getPort() { |
| return server.getLocalPort(); |
| } |
| } |