1 /*
2 * Copyright (c) 2010, 2013, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.net;
27
28 import java.io.IOException;
29 import java.lang.reflect.Field;
30 import java.lang.reflect.Method;
31 import java.util.HashMap;
32 import java.util.Map;
33 import java.util.Set;
34
35 /**
36 * Basic SocketImpl that relies on the internal HTTP protocol handler
37 * implementation to perform the HTTP tunneling and authentication. The
38 * sockets impl is swapped out and replaced with the socket from the HTTP
39 * handler after the tunnel is successfully setup.
40 *
41 * @since 1.8
42 */
43
44 /*package*/ class HttpConnectSocketImpl extends PlainSocketImpl {
45
46 private static final String httpURLClazzStr =
47 "sun.net.www.protocol.http.HttpURLConnection";
48 private static final String netClientClazzStr = "sun.net.NetworkClient";
49 private static final String doTunnelingStr = "doTunneling";
50 private static final Field httpField;
51 private static final Field serverSocketField;
52 private static final Method doTunneling;
53
54 private final String server;
55 private InetSocketAddress external_address;
56 private HashMap<Integer, Object> optionsMap = new HashMap<>();
57
58 static {
59 try {
60 Class<?> httpClazz = Class.forName(httpURLClazzStr, true, null);
61 httpField = httpClazz.getDeclaredField("http");
62 doTunneling = httpClazz.getDeclaredMethod(doTunnelingStr);
63 Class<?> netClientClazz = Class.forName(netClientClazzStr, true, null);
64 serverSocketField = netClientClazz.getDeclaredField("serverSocket");
65
66 java.security.AccessController.doPrivileged(
67 new java.security.PrivilegedAction<>() {
68 public Void run() {
69 httpField.setAccessible(true);
70 serverSocketField.setAccessible(true);
71 return null;
72 }
73 });
74 } catch (ReflectiveOperationException x) {
75 throw new InternalError("Should not reach here", x);
76 }
77 }
78
79 HttpConnectSocketImpl(String server, int port) {
80 this.server = server;
81 this.port = port;
82 }
83
84 HttpConnectSocketImpl(Proxy proxy) {
85 SocketAddress a = proxy.address();
86 if ( !(a instanceof InetSocketAddress) )
87 throw new IllegalArgumentException("Unsupported address type");
88
89 InetSocketAddress ad = (InetSocketAddress) a;
90 server = ad.getHostString();
91 port = ad.getPort();
92 }
93
94 @Override
95 protected void connect(SocketAddress endpoint, int timeout)
96 throws IOException
97 {
98 if (endpoint == null || !(endpoint instanceof InetSocketAddress))
99 throw new IllegalArgumentException("Unsupported address type");
100 final InetSocketAddress epoint = (InetSocketAddress)endpoint;
101 final String destHost = epoint.isUnresolved() ? epoint.getHostName()
102 : epoint.getAddress().getHostAddress();
103 final int destPort = epoint.getPort();
104
105 SecurityManager security = System.getSecurityManager();
106 if (security != null)
107 security.checkConnect(destHost, destPort);
108
109 // Connect to the HTTP proxy server
110 String urlString = "http://" + destHost + ":" + destPort;
111 Socket httpSocket = privilegedDoTunnel(urlString, timeout);
112
113 // Success!
114 external_address = epoint;
115
116 // close the original socket impl and release its descriptor
117 close();
118
119 // update the Sockets impl to the impl from the http Socket
120 AbstractPlainSocketImpl psi = (AbstractPlainSocketImpl) httpSocket.impl;
121 this.getSocket().impl = psi;
122
123 // best effort is made to try and reset options previously set
124 Set<Map.Entry<Integer,Object>> options = optionsMap.entrySet();
125 try {
126 for(Map.Entry<Integer,Object> entry : options) {
127 psi.setOption(entry.getKey(), entry.getValue());
128 }
129 } catch (IOException x) { /* gulp! */ }
130 }
131
132 @Override
133 public void setOption(int opt, Object val) throws SocketException {
134 super.setOption(opt, val);
135
136 if (external_address != null)
137 return; // we're connected, just return
138
139 // store options so that they can be re-applied to the impl after connect
140 optionsMap.put(opt, val);
141 }
142
143 private Socket privilegedDoTunnel(final String urlString,
144 final int timeout)
145 throws IOException
146 {
147 try {
148 return java.security.AccessController.doPrivileged(
149 new java.security.PrivilegedExceptionAction<>() {
150 public Socket run() throws IOException {
151 return doTunnel(urlString, timeout);
152 }
153 });
154 } catch (java.security.PrivilegedActionException pae) {
155 throw (IOException) pae.getException();
156 }
157 }
158
159 private Socket doTunnel(String urlString, int connectTimeout)
160 throws IOException
161 {
162 Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(server, port));
163 URL destURL = new URL(urlString);
164 HttpURLConnection conn = (HttpURLConnection) destURL.openConnection(proxy);
165 conn.setConnectTimeout(connectTimeout);
166 conn.setReadTimeout(this.timeout);
167 conn.connect();
168 doTunneling(conn);
169 try {
170 Object httpClient = httpField.get(conn);
171 return (Socket) serverSocketField.get(httpClient);
172 } catch (IllegalAccessException x) {
173 throw new InternalError("Should not reach here", x);
174 }
175 }
176
177 private void doTunneling(HttpURLConnection conn) {
178 try {
179 doTunneling.invoke(conn);
180 } catch (ReflectiveOperationException x) {
181 throw new InternalError("Should not reach here", x);
182 }
183 }
184
185 @Override
186 protected InetAddress getInetAddress() {
187 if (external_address != null)
188 return external_address.getAddress();
189 else
190 return super.getInetAddress();
191 }
192
193 @Override
194 protected int getPort() {
195 if (external_address != null)
196 return external_address.getPort();
197 else
198 return super.getPort();
199 }
200
201 @Override
202 protected int getLocalPort() {
203 if (socket != null)
204 return super.getLocalPort();
205 if (external_address != null)
206 return external_address.getPort();
207 else
208 return super.getLocalPort();
209 }
210 }