//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.client;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.jetty.client.api.Connection;
import org.eclipse.jetty.http.HttpScheme;
import org.eclipse.jetty.io.AbstractConnection;
import org.eclipse.jetty.io.ClientConnectionFactory;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.ssl.SslClientConnectionFactory;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.Promise;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
public class Socks4Proxy extends ProxyConfiguration.Proxy
{
public Socks4Proxy(String host, int port)
{
this(new Origin.Address(host, port), false);
}
public Socks4Proxy(Origin.Address address, boolean secure)
{
super(address, secure);
}
@Override
public ClientConnectionFactory newClientConnectionFactory(ClientConnectionFactory connectionFactory)
{
return new Socks4ProxyClientConnectionFactory(connectionFactory);
}
public static class Socks4ProxyClientConnectionFactory implements ClientConnectionFactory
{
private final ClientConnectionFactory connectionFactory;
public Socks4ProxyClientConnectionFactory(ClientConnectionFactory connectionFactory)
{
this.connectionFactory = connectionFactory;
}
@Override
public org.eclipse.jetty.io.Connection newConnection(EndPoint endPoint, Map<String, Object> context) throws IOException
{
HttpDestination destination = (HttpDestination)context.get(HttpClientTransport.HTTP_DESTINATION_CONTEXT_KEY);
Executor executor = destination.getHttpClient().getExecutor();
return new Socks4ProxyConnection(endPoint, executor, connectionFactory, context);
}
}
private static class Socks4ProxyConnection extends AbstractConnection implements Callback
{
private static final Pattern IPv4_PATTERN = Pattern.compile("(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})");
private static final Logger LOG = Log.getLogger(Socks4ProxyConnection.class);
private final Socks4Parser parser = new Socks4Parser();
private final ClientConnectionFactory connectionFactory;
private final Map<String, Object> context;
public Socks4ProxyConnection(EndPoint endPoint, Executor executor, ClientConnectionFactory connectionFactory, Map<String, Object> context)
{
super(endPoint, executor, false);
this.connectionFactory = connectionFactory;
this.context = context;
}
@Override
public void onOpen()
{
super.onOpen();
writeSocks4Connect();
}
/**
* Writes the SOCKS "connect" bytes, differentiating between SOCKS 4 and 4A;
* the former sends an IPv4 address, the latter the full domain name.
*/
private void writeSocks4Connect()
{
HttpDestination destination = (HttpDestination)context.get(HttpClientTransport.HTTP_DESTINATION_CONTEXT_KEY);
String host = destination.getHost();
short port = (short)destination.getPort();
Matcher matcher = IPv4_PATTERN.matcher(host);
if (matcher.matches())
{
// SOCKS 4
ByteBuffer buffer = ByteBuffer.allocate(9);
buffer.put((byte)4).put((byte)1).putShort(port);
for (int i = 1; i <= 4; ++i)
buffer.put((byte)Integer.parseInt(matcher.group(i)));
buffer.put((byte)0);
buffer.flip();
getEndPoint().write(this, buffer);
}
else
{
// SOCKS 4A
byte[] hostBytes = host.getBytes(StandardCharsets.UTF_8);
ByteBuffer buffer = ByteBuffer.allocate(9 + hostBytes.length + 1);
buffer.put((byte)4).put((byte)1).putShort(port);
buffer.put((byte)0).put((byte)0).put((byte)0).put((byte)1).put((byte)0);
buffer.put(hostBytes).put((byte)0);
buffer.flip();
getEndPoint().write(this, buffer);
}
}
@Override
public void succeeded()
{
if (LOG.isDebugEnabled())
LOG.debug("Written SOCKS4 connect request");
fillInterested();
}
@Override
public void failed(Throwable x)
{
close();
@SuppressWarnings("unchecked")
Promise<Connection> promise = (Promise<Connection>)context.get(HttpClientTransport.HTTP_CONNECTION_PROMISE_CONTEXT_KEY);
promise.failed(x);
}
@Override
public void onFillable()
{
try
{
while (true)
{
// Avoid to read too much from the socket: ask
// the parser how much left there is to read.
ByteBuffer buffer = BufferUtil.allocate(parser.expected());
int filled = getEndPoint().fill(buffer);
if (LOG.isDebugEnabled())
LOG.debug("Read SOCKS4 connect response, {} bytes", filled);
if (filled < 0)
throw new IOException("SOCKS4 tunnel failed, connection closed");
if (filled == 0)
{
fillInterested();
return;
}
if (parser.parse(buffer))
return;
}
}
catch (Throwable x)
{
failed(x);
}
}
private void onSocks4Response(int responseCode) throws IOException
{
if (responseCode == 0x5A)
tunnel();
else
throw new IOException("SOCKS4 tunnel failed with code " + responseCode);
}
private void tunnel()
{
try
{
HttpDestination destination = (HttpDestination)context.get(HttpClientTransport.HTTP_DESTINATION_CONTEXT_KEY);
HttpClient client = destination.getHttpClient();
ClientConnectionFactory connectionFactory = this.connectionFactory;
if (HttpScheme.HTTPS.is(destination.getScheme()))
connectionFactory = new SslClientConnectionFactory(client.getSslContextFactory(), client.getByteBufferPool(), client.getExecutor(), connectionFactory);
org.eclipse.jetty.io.Connection connection = connectionFactory.newConnection(getEndPoint(), context);
ClientConnectionFactory.Helper.replaceConnection(this, connection);
if (LOG.isDebugEnabled())
LOG.debug("SOCKS4 tunnel established: {} over {}", this, connection);
}
catch (Throwable x)
{
failed(x);
}
}
private class Socks4Parser
{
private static final int EXPECTED_LENGTH = 8;
private int cursor;
private int response;
private boolean parse(ByteBuffer buffer) throws IOException
{
while (buffer.hasRemaining())
{
byte current = buffer.get();
if (cursor == 1)
response = current & 0xFF;
++cursor;
if (cursor == EXPECTED_LENGTH)
{
onSocks4Response(response);
return true;
}
}
return false;
}
private int expected()
{
return EXPECTED_LENGTH - cursor;
}
}
}
}