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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2010, 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 | package sun.net; | ||
| 26 | |||
| 27 | import java.io.*; | ||
| 28 | import java.net.Socket; | ||
| 29 | import java.net.InetAddress; | ||
| 30 | import java.net.InetSocketAddress; | ||
| 31 | import java.net.UnknownHostException; | ||
| 32 | import java.net.Proxy; | ||
| 33 | import java.util.Arrays; | ||
| 34 | import java.security.AccessController; | ||
| 35 | import java.security.PrivilegedAction; | ||
| 36 | |||
| 37 | /** | ||
| 38 | * This is the base class for network clients. | ||
| 39 | * | ||
| 40 | * @author Jonathan Payne | ||
| 41 | */ | ||
| 42 | public class NetworkClient { | ||
| 43 | /* Default value of read timeout, if not specified (infinity) */ | ||
| 44 | public static final int DEFAULT_READ_TIMEOUT = -1; | ||
| 45 | |||
| 46 | /* Default value of connect timeout, if not specified (infinity) */ | ||
| 47 | public static final int DEFAULT_CONNECT_TIMEOUT = -1; | ||
| 48 | |||
| 49 | protected Proxy proxy = Proxy.NO_PROXY; | ||
| 50 | /** Socket for communicating with server. */ | ||
| 51 | protected Socket serverSocket = null; | ||
| 52 | |||
| 53 | /** Stream for printing to the server. */ | ||
| 54 | public PrintStream serverOutput; | ||
| 55 | |||
| 56 | /** Buffered stream for reading replies from server. */ | ||
| 57 | public InputStream serverInput; | ||
| 58 | |||
| 59 | protected static int defaultSoTimeout; | ||
| 60 | protected static int defaultConnectTimeout; | ||
| 61 | |||
| 62 | protected int readTimeout = DEFAULT_READ_TIMEOUT; | ||
| 63 | protected int connectTimeout = DEFAULT_CONNECT_TIMEOUT; | ||
| 64 | /* Name of encoding to use for output */ | ||
| 65 | protected static String encoding; | ||
| 66 | |||
| 67 | static { | ||
| 68 | final int vals[] = {0, 0}; | ||
| 69 | final String encs[] = { null }; | ||
| 70 | |||
| 71 | AccessController.doPrivileged( | ||
| 72 | new PrivilegedAction<Void>() { | ||
| 73 | public Void run() { | ||
| 74 | vals[0] = Integer.getInteger("sun.net.client.defaultReadTimeout", 0).intValue(); | ||
| 75 | vals[1] = Integer.getInteger("sun.net.client.defaultConnectTimeout", 0).intValue(); | ||
| 76 | encs[0] = System.getProperty("file.encoding", "ISO8859_1"); | ||
| 77 | return null; | ||
| 78 | } | ||
| 79 | }); | ||
| 80 | if (vals[0] != 0) { | ||
| 81 | defaultSoTimeout = vals[0]; | ||
| 82 | } | ||
| 83 | if (vals[1] != 0) { | ||
| 84 | defaultConnectTimeout = vals[1]; | ||
| 85 | } | ||
| 86 | |||
| 87 | encoding = encs[0]; | ||
| 88 | try { | ||
| 89 | if (!isASCIISuperset (encoding)) { | ||
| 90 | encoding = "ISO8859_1"; | ||
| 91 | } | ||
| 92 | } catch (Exception e) { | ||
| 93 | encoding = "ISO8859_1"; | ||
| 94 | } | ||
| 95 | } | ||
| 96 | |||
| 97 | |||
| 98 | /** | ||
| 99 | * Test the named character encoding to verify that it converts ASCII | ||
| 100 | * characters correctly. We have to use an ASCII based encoding, or else | ||
| 101 | * the NetworkClients will not work correctly in EBCDIC based systems. | ||
| 102 | * However, we cannot just use ASCII or ISO8859_1 universally, because in | ||
| 103 | * Asian locales, non-ASCII characters may be embedded in otherwise | ||
| 104 | * ASCII based protocols (eg. HTTP). The specifications (RFC2616, 2398) | ||
| 105 | * are a little ambiguous in this matter. For instance, RFC2398 [part 2.1] | ||
| 106 | * says that the HTTP request URI should be escaped using a defined | ||
| 107 | * mechanism, but there is no way to specify in the escaped string what | ||
| 108 | * the original character set is. It is not correct to assume that | ||
| 109 | * UTF-8 is always used (as in URLs in HTML 4.0). For this reason, | ||
| 110 | * until the specifications are updated to deal with this issue more | ||
| 111 | * comprehensively, and more importantly, HTTP servers are known to | ||
| 112 | * support these mechanisms, we will maintain the current behavior | ||
| 113 | * where it is possible to send non-ASCII characters in their original | ||
| 114 | * unescaped form. | ||
| 115 | */ | ||
| 116 | private static boolean isASCIISuperset (String encoding) throws Exception { | ||
| 117 | String chkS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"+ | ||
| 118 | "abcdefghijklmnopqrstuvwxyz-_.!~*'();/?:@&=+$,"; | ||
| 119 | |||
| 120 | // Expected byte sequence for string above | ||
| 121 | byte[] chkB = { 48,49,50,51,52,53,54,55,56,57,65,66,67,68,69,70,71,72, | ||
| 122 | 73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,97,98,99, | ||
| 123 | 100,101,102,103,104,105,106,107,108,109,110,111,112,113,114, | ||
| 124 | 115,116,117,118,119,120,121,122,45,95,46,33,126,42,39,40,41,59, | ||
| 125 | 47,63,58,64,38,61,43,36,44}; | ||
| 126 | |||
| 127 | byte[] b = chkS.getBytes (encoding); | ||
| 128 | return Arrays.equals (b, chkB); | ||
| 129 | } | ||
| 130 | |||
| 131 | /** Open a connection to the server. */ | ||
| 132 | public void openServer(String server, int port) | ||
| 133 | throws IOException, UnknownHostException { | ||
| 134 | if (serverSocket != null) | ||
| 135 | closeServer(); | ||
| 136 | serverSocket = doConnect (server, port); | ||
| 137 | try { | ||
| 138 | serverOutput = new PrintStream(new BufferedOutputStream( | ||
| 139 | serverSocket.getOutputStream()), | ||
| 140 | true, encoding); | ||
| 141 | } catch (UnsupportedEncodingException e) { | ||
| 142 | throw new InternalError(encoding +"encoding not found"); | ||
| 143 | } | ||
| 144 | serverInput = new BufferedInputStream(serverSocket.getInputStream()); | ||
| 145 | } | ||
| 146 | |||
| 147 | /** | ||
| 148 | * Return a socket connected to the server, with any | ||
| 149 | * appropriate options pre-established | ||
| 150 | */ | ||
| 151 | protected Socket doConnect (String server, int port) | ||
| 152 | throws IOException, UnknownHostException { | ||
| 153 | Socket s; | ||
| 154 | if (proxy != null) { | ||
| 155 | if (proxy.type() == Proxy.Type.SOCKS) { | ||
| 156 | s = AccessController.doPrivileged( | ||
| 157 | new PrivilegedAction<Socket>() { | ||
| 158 | public Socket run() { | ||
| 159 | return new Socket(proxy); | ||
| 160 | }}); | ||
| 161 | } else if (proxy.type() == Proxy.Type.DIRECT) { | ||
| 162 | s = createSocket(); | ||
| 163 | } else { | ||
| 164 | // Still connecting through a proxy | ||
| 165 | // server & port will be the proxy address and port | ||
| 166 | s = new Socket(Proxy.NO_PROXY); | ||
| 167 | } | ||
| 168 | } else | ||
| 169 | s = createSocket(); | ||
| 170 | // Instance specific timeouts do have priority, that means | ||
| 171 | // connectTimeout & readTimeout (-1 means not set) | ||
| 172 | // Then global default timeouts | ||
| 173 | // Then no timeout. | ||
| 174 | if (connectTimeout >= 0) { | ||
| 175 | s.connect(new InetSocketAddress(server, port), connectTimeout); | ||
| 176 | } else { | ||
| 177 | if (defaultConnectTimeout > 0) { | ||
| 178 | s.connect(new InetSocketAddress(server, port), defaultConnectTimeout); | ||
| 179 | } else { | ||
| 180 | s.connect(new InetSocketAddress(server, port)); | ||
| 181 | } | ||
| 182 | } | ||
| 183 | if (readTimeout >= 0) | ||
| 184 | s.setSoTimeout(readTimeout); | ||
| 185 | else if (defaultSoTimeout > 0) { | ||
| 186 | s.setSoTimeout(defaultSoTimeout); | ||
| 187 | } | ||
| 188 | return s; | ||
| 189 | } | ||
| 190 | |||
| 191 | /** | ||
| 192 | * The following method, createSocket, is provided to allow the | ||
| 193 | * https client to override it so that it may use its socket factory | ||
| 194 | * to create the socket. | ||
| 195 | */ | ||
| 196 | protected Socket createSocket() throws IOException { | ||
| 197 | return new java.net.Socket(); | ||
| 198 | } | ||
| 199 | |||
| 200 | protected InetAddress getLocalAddress() throws IOException { | ||
| 201 | if (serverSocket == null) | ||
| 202 | throw new IOException("not connected"); | ||
| 203 | return serverSocket.getLocalAddress(); | ||
| 204 | } | ||
| 205 | |||
| 206 | /** Close an open connection to the server. */ | ||
| 207 | public void closeServer() throws IOException { | ||
| 208 | if (! serverIsOpen()) { | ||
| 209 | return; | ||
| 210 | } | ||
| 211 | serverSocket.close(); | ||
| 212 | serverSocket = null; | ||
| 213 | serverInput = null; | ||
| 214 | serverOutput = null; | ||
| 215 | } | ||
| 216 | |||
| 217 | /** Return server connection status */ | ||
| 218 | public boolean serverIsOpen() { | ||
| 219 | return serverSocket != null; | ||
| 220 | } | ||
| 221 | |||
| 222 | /** Create connection with host <i>host</i> on port <i>port</i> */ | ||
| 223 | public NetworkClient(String host, int port) throws IOException { | ||
| 224 | openServer(host, port); | ||
| 225 | } | ||
| 226 | |||
| 227 | public NetworkClient() {} | ||
| 228 | |||
| 229 | public void setConnectTimeout(int timeout) { | ||
| 230 | connectTimeout = timeout; | ||
| 231 | } | ||
| 232 | |||
| 233 | public int getConnectTimeout() { | ||
| 234 | return connectTimeout; | ||
| 235 | } | ||
| 236 | |||
| 237 | /** | ||
| 238 | * Sets the read timeout. | ||
| 239 | * | ||
| 240 | * Note: Public URLConnection (and protocol specific implementations) | ||
| 241 | * protect against negative timeout values being set. This implemenation, | ||
| 242 | * and protocol specific implementations, use -1 to represent the default | ||
| 243 | * read timeout. | ||
| 244 | * | ||
| 245 | * This method may be invoked with the default timeout value when the | ||
| 246 | * protocol handler is trying to reset the timeout after doing a | ||
| 247 | * potentially blocking internal operation, e.g. cleaning up unread | ||
| 248 | * response data, buffering error stream response data, etc | ||
| 249 | */ | ||
| 250 | public void setReadTimeout(int timeout) { | ||
| 251 | if (timeout == DEFAULT_READ_TIMEOUT) | ||
| 252 | timeout = defaultSoTimeout; | ||
| 253 | |||
| 254 | if (serverSocket != null && timeout >= 0) { | ||
| 255 | try { | ||
| 256 | serverSocket.setSoTimeout(timeout); | ||
| 257 | } catch(IOException e) { | ||
| 258 | // We tried... | ||
| 259 | } | ||
| 260 | } | ||
| 261 | readTimeout = timeout; | ||
| 262 | } | ||
| 263 | |||
| 264 | public int getReadTimeout() { | ||
| 265 | return readTimeout; | ||
| 266 | } | ||
| 267 | } | ||