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/*
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5506
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* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.net.*;
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import java.io.*;
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public class SocksServer extends Thread {
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// Some useful SOCKS constant
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static final int PROTO_VERS4 = 4;
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static final int PROTO_VERS = 5;
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static final int DEFAULT_PORT = 1080;
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static final int NO_AUTH = 0;
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static final int GSSAPI = 1;
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static final int USER_PASSW = 2;
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static final int NO_METHODS = -1;
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static final int CONNECT = 1;
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static final int BIND = 2;
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static final int UDP_ASSOC = 3;
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static final int IPV4 = 1;
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static final int DOMAIN_NAME = 3;
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static final int IPV6 = 4;
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static final int REQUEST_OK = 0;
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static final int GENERAL_FAILURE = 1;
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static final int NOT_ALLOWED = 2;
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static final int NET_UNREACHABLE = 3;
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static final int HOST_UNREACHABLE = 4;
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static final int CONN_REFUSED = 5;
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static final int TTL_EXPIRED = 6;
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static final int CMD_NOT_SUPPORTED = 7;
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static final int ADDR_TYPE_NOT_SUP = 8;
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private int port;
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private ServerSocket server;
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private boolean useV4 = false;
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private java.util.Hashtable users = new java.util.Hashtable();
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private boolean done = false;
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// Inner class to handle protocol with client
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// This is the bulk of the work (protocol handler)
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class ClientHandler extends Thread {
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private InputStream in;
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private OutputStream out;
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private Socket client;
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private Socket dest;
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// Simple tunneling class, moving bits from one stream to another
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class Tunnel extends Thread {
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private InputStream tin;
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private OutputStream tout;
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Tunnel(InputStream in, OutputStream out) {
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tin = in;
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tout = out;
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}
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public void run() {
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int b;
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while (true) {
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try {
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b = tin.read();
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if (b == -1) {
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tin.close();
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tout.close();
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return;
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}
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tout.write(b);
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} catch (IOException e) {
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// actually exit from the thread
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return;
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}
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}
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}
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}
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ClientHandler(Socket s) throws IOException {
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client = s;
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in = client.getInputStream();
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out = client.getOutputStream();
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}
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private void readBuf(InputStream is, byte[] buf) throws IOException {
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int l = buf.length;
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int count = 0;
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int i;
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do {
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i = is.read(buf, count, l - count);
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if (i == -1)
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throw new IOException("unexpected EOF");
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count += i;
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} while (count < l);
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}
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private boolean userPassAuth() throws IOException {
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int ver = in.read();
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int ulen = in.read();
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if (ulen <= 0)
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throw new SocketException("SOCKS protocol error");
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byte[] buf = new byte[ulen];
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readBuf(in, buf);
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String uname = new String(buf);
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String password = null;
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ulen = in.read();
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if (ulen < 0)
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throw new SocketException("SOCKS protocol error");
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if (ulen > 0) {
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buf = new byte[ulen];
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readBuf(in, buf);
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password = new String(buf);
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}
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// Check username/password validity here
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System.err.println("User: '" + uname);
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System.err.println("PSWD: '" + password);
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if (users.containsKey(uname)) {
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String p1 = (String) users.get(uname);
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System.err.println("p1 = " + p1);
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if (p1.equals(password)) {
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out.write(PROTO_VERS);
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out.write(REQUEST_OK);
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out.flush();
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return true;
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}
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}
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out.write(PROTO_VERS);
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out.write(NOT_ALLOWED);
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out.flush();
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return false;
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}
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private void purge() throws IOException {
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boolean done = false;
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int i = 0;
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client.setSoTimeout(1000);
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while(!done && i != -1) {
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try {
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i = in.read();
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} catch(IOException e) {
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done = true;
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}
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}
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}
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// Handle the SOCKS version 4 protocl
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private void getRequestV4() throws IOException {
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int ver = in.read();
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int cmd = in.read();
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if (ver == -1 || cmd == -1) {
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// EOF
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in.close();
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out.close();
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return;
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}
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if (ver != 0 && ver != 4) {
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out.write(PROTO_VERS4);
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out.write(91); // Bad Request
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out.write(0);
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out.write(0);
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out.write(0);
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out.write(0);
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out.write(0);
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out.write(0);
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out.write(0);
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out.flush();
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purge();
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out.close();
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in.close();
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return;
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}
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if (cmd == CONNECT) {
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int port = ((in.read() & 0xff) << 8);
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port += (in.read() & 0xff);
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byte[] buf = new byte[4];
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readBuf(in, buf);
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InetAddress addr = InetAddress.getByAddress(buf);
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// We don't use the username...
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int c;
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do {
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c = (in.read() & 0xff);
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} while (c!=0);
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boolean ok = true;
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try {
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dest = new Socket(addr, port);
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} catch (IOException e) {
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ok = false;
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}
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if (!ok) {
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out.write(PROTO_VERS4);
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out.write(91);
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out.write(0);
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out.write(0);
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out.write(buf);
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out.flush();
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purge();
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out.close();
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in.close();
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return;
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}
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out.write(PROTO_VERS4);
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out.write(90); // Success
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out.write((port >> 8) & 0xff);
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out.write(port & 0xff);
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out.write(buf);
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out.flush();
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InputStream in2 = dest.getInputStream();
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OutputStream out2 = dest.getOutputStream();
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Tunnel tunnel = new Tunnel(in2, out);
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tunnel.start();
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int b = 0;
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do {
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try {
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b = in.read();
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if (b == -1) {
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in.close();
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out2.close();
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return;
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}
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out2.write(b);
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} catch (IOException ex) {
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}
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} while (!client.isClosed());
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}
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}
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// Negociate the authentication scheme with the client
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private void negociate() throws IOException {
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int ver = in.read();
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int n = in.read();
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byte[] buf = null;
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if (n > 0) {
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buf = new byte[n];
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readBuf(in, buf);
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}
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int scheme = NO_AUTH;
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for (int i = 0; i < n; i++)
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if (buf[i] == USER_PASSW)
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scheme = USER_PASSW;
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out.write(PROTO_VERS);
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out.write(scheme);
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out.flush();
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if (scheme == USER_PASSW)
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userPassAuth();
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}
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// Send error message then close the streams
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private void sendError(int code) {
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try {
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out.write(PROTO_VERS);
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out.write(code);
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out.write(0);
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out.write(IPV4);
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for (int i=0; i<6; i++)
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out.write(0);
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out.flush();
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out.close();
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} catch (IOException ex) {
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}
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}
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// Actually connect the proxy to the destination then initiate tunneling
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private void doConnect(InetSocketAddress addr) throws IOException {
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dest = new Socket();
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try {
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dest.connect(addr, 10000);
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} catch (SocketTimeoutException ex) {
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sendError(HOST_UNREACHABLE);
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return;
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} catch (ConnectException cex) {
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sendError(CONN_REFUSED);
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return;
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}
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// Success
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InetAddress iadd = addr.getAddress();
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if (iadd instanceof Inet4Address) {
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out.write(PROTO_VERS);
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out.write(REQUEST_OK);
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out.write(0);
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out.write(IPV4);
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out.write(iadd.getAddress());
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} else if (iadd instanceof Inet6Address) {
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out.write(PROTO_VERS);
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out.write(REQUEST_OK);
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out.write(0);
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out.write(IPV6);
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out.write(iadd.getAddress());
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} else {
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sendError(GENERAL_FAILURE);
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return;
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}
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out.write((addr.getPort() >> 8) & 0xff);
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out.write((addr.getPort() >> 0) & 0xff);
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out.flush();
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InputStream in2 = dest.getInputStream();
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OutputStream out2 = dest.getOutputStream();
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Tunnel tunnel = new Tunnel(in2, out);
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tunnel.start();
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int b = 0;
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do {
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// Note that the socket might be closed from another thread (the tunnel)
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try {
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b = in.read();
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336 |
if (b == -1) {
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in.close();
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out2.close();
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return;
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340 |
}
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out2.write(b);
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} catch(IOException ioe) {
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343 |
}
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} while (!client.isClosed());
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}
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346 |
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347 |
private void doBind(InetSocketAddress addr) throws IOException {
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348 |
ServerSocket svr = new ServerSocket();
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349 |
svr.bind(null);
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350 |
InetSocketAddress bad = (InetSocketAddress) svr.getLocalSocketAddress();
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out.write(PROTO_VERS);
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out.write(REQUEST_OK);
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out.write(0);
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out.write(IPV4);
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out.write(bad.getAddress().getAddress());
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356 |
out.write((bad.getPort() >> 8) & 0xff);
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357 |
out.write((bad.getPort() & 0xff));
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358 |
out.flush();
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359 |
dest = svr.accept();
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360 |
bad = (InetSocketAddress) dest.getRemoteSocketAddress();
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361 |
out.write(PROTO_VERS);
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362 |
out.write(REQUEST_OK);
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363 |
out.write(0);
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364 |
out.write(IPV4);
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365 |
out.write(bad.getAddress().getAddress());
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366 |
out.write((bad.getPort() >> 8) & 0xff);
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367 |
out.write((bad.getPort() & 0xff));
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368 |
out.flush();
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369 |
InputStream in2 = dest.getInputStream();
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370 |
OutputStream out2 = dest.getOutputStream();
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371 |
|
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372 |
Tunnel tunnel = new Tunnel(in2, out);
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373 |
tunnel.start();
|
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374 |
|
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375 |
int b = 0;
|
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376 |
do {
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377 |
// Note that the socket might be close from another thread (the tunnel)
|
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378 |
try {
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379 |
b = in.read();
|
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380 |
if (b == -1) {
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381 |
in.close();
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382 |
out2.close();
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383 |
return;
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|
384 |
}
|
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385 |
out2.write(b);
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|
386 |
} catch(IOException ioe) {
|
|
387 |
}
|
|
388 |
} while (!client.isClosed());
|
|
389 |
|
|
390 |
}
|
|
391 |
|
|
392 |
// Handle the SOCKS v5 requests
|
|
393 |
|
|
394 |
private void getRequest() throws IOException {
|
|
395 |
int ver = in.read();
|
|
396 |
int cmd = in.read();
|
|
397 |
if (ver == -1 || cmd == -1) {
|
|
398 |
in.close();
|
|
399 |
out.close();
|
|
400 |
return;
|
|
401 |
}
|
|
402 |
int rsv = in.read();
|
|
403 |
int atyp = in.read();
|
|
404 |
String addr = null;
|
|
405 |
int port = 0;
|
|
406 |
|
|
407 |
switch(atyp) {
|
|
408 |
case IPV4:
|
|
409 |
{
|
|
410 |
byte[] buf = new byte[4];
|
|
411 |
readBuf(in, buf);
|
|
412 |
int i = 0;
|
|
413 |
StringBuffer sb = new StringBuffer();
|
|
414 |
for (i = 0; i < 4; i++) {
|
|
415 |
sb.append(buf[i]&0xff);
|
|
416 |
if (i < 3)
|
|
417 |
sb.append('.');
|
|
418 |
}
|
|
419 |
addr = sb.toString();
|
|
420 |
}
|
|
421 |
break;
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|
422 |
case DOMAIN_NAME:
|
|
423 |
{
|
|
424 |
int i = in.read();
|
|
425 |
byte[] buf = new byte[i];
|
|
426 |
readBuf(in, buf);
|
|
427 |
addr = new String(buf);
|
|
428 |
}
|
|
429 |
break;
|
|
430 |
case IPV6:
|
|
431 |
{
|
|
432 |
byte[] buf = new byte[16];
|
|
433 |
readBuf(in, buf);
|
|
434 |
int i = 0;
|
|
435 |
StringBuffer sb = new StringBuffer();
|
|
436 |
for (i = 0; i<16; i++) {
|
|
437 |
sb.append(Integer.toHexString(buf[i]&0xff));
|
|
438 |
if (i < 15)
|
|
439 |
sb.append(':');
|
|
440 |
}
|
|
441 |
addr = sb.toString();
|
|
442 |
}
|
|
443 |
break;
|
|
444 |
}
|
|
445 |
|
|
446 |
port = ((in.read()&0xff) << 8);
|
|
447 |
port += (in.read()&0xff);
|
|
448 |
|
|
449 |
InetSocketAddress socAddr = new InetSocketAddress(addr, port);
|
|
450 |
switch(cmd) {
|
|
451 |
case CONNECT:
|
|
452 |
doConnect(socAddr);
|
|
453 |
break;
|
|
454 |
case BIND:
|
|
455 |
doBind(socAddr);
|
|
456 |
break;
|
|
457 |
case UDP_ASSOC:
|
|
458 |
// doUDP(socAddr);
|
|
459 |
break;
|
|
460 |
}
|
|
461 |
}
|
|
462 |
|
|
463 |
public void run() {
|
|
464 |
String line = null;
|
|
465 |
try {
|
|
466 |
if (useV4) {
|
|
467 |
getRequestV4();
|
|
468 |
} else {
|
|
469 |
negociate();
|
|
470 |
getRequest();
|
|
471 |
}
|
|
472 |
} catch (IOException ex) {
|
|
473 |
try {
|
|
474 |
sendError(GENERAL_FAILURE);
|
|
475 |
} catch (Exception e) {
|
|
476 |
}
|
|
477 |
} finally {
|
|
478 |
try {
|
|
479 |
client.close();
|
|
480 |
} catch (IOException e2) {
|
|
481 |
}
|
|
482 |
}
|
|
483 |
}
|
|
484 |
|
|
485 |
}
|
|
486 |
|
|
487 |
public SocksServer(int port, boolean v4) throws IOException {
|
|
488 |
this(port);
|
|
489 |
this.useV4 = v4;
|
|
490 |
}
|
|
491 |
|
|
492 |
public SocksServer(int port) throws IOException {
|
|
493 |
this.port = port;
|
|
494 |
server = new ServerSocket();
|
|
495 |
server.bind(new InetSocketAddress(port));
|
|
496 |
}
|
|
497 |
|
|
498 |
public SocksServer() throws IOException {
|
|
499 |
this (DEFAULT_PORT);
|
|
500 |
}
|
|
501 |
|
|
502 |
public void addUser(String user, String passwd) {
|
|
503 |
users.put(user, passwd);
|
|
504 |
}
|
|
505 |
|
|
506 |
public synchronized void terminate() {
|
|
507 |
done = true;
|
|
508 |
}
|
|
509 |
|
|
510 |
public void run() {
|
|
511 |
ClientHandler cl = null;
|
|
512 |
while (!done) {
|
|
513 |
try {
|
|
514 |
Socket s = server.accept();
|
|
515 |
cl = new ClientHandler(s);
|
|
516 |
cl.start();
|
|
517 |
} catch (IOException ex) {
|
|
518 |
if (cl != null)
|
|
519 |
cl.interrupt();
|
|
520 |
}
|
|
521 |
}
|
|
522 |
}
|
|
523 |
}
|