1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
//
// ========================================================================
// Copyright (c) 1995-2016 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);
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 newConnection = connectionFactory.newConnection(getEndPoint(), context);
getEndPoint().upgrade(newConnection);
if (LOG.isDebugEnabled())
LOG.debug("SOCKS4 tunnel established: {} over {}", this, newConnection);
}
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;
}
}
}
}
|
