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 AccessController.doPrivileged( 204 new PrivilegedAction<InetAddress>() { 205 public InetAddress run() { 206 return serverSocket.getLocalAddress(); 207 208 } 209 }); 210 } 211 212 /** Close an open connection to the server. */ 213 public void closeServer() throws IOException { 214 if (! serverIsOpen()) { 215 return; 216 } 217 serverSocket.close(); 218 serverSocket = null; 219 serverInput = null; 220 serverOutput = null; 221 } 222 223 /** Return server connection status */ 224 public boolean serverIsOpen() { 225 return serverSocket != null; 226 } 227 228 /** Create connection with host <i>host</i> on port <i>port</i> */ 229 public NetworkClient(String host, int port) throws IOException { 230 openServer(host, port); 231 } 232 233 public NetworkClient() {} 234 235 public void setConnectTimeout(int timeout) { 236 connectTimeout = timeout; 237 } 238 239 public int getConnectTimeout() { 240 return connectTimeout; 241 } 242 243 /** 244 * Sets the read timeout. 245 * 246 * Note: Public URLConnection (and protocol specific implementations) 247 * protect against negative timeout values being set. This implemenation, 248 * and protocol specific implementations, use -1 to represent the default 249 * read timeout. 250 * 251 * This method may be invoked with the default timeout value when the 252 * protocol handler is trying to reset the timeout after doing a 253 * potentially blocking internal operation, e.g. cleaning up unread 254 * response data, buffering error stream response data, etc 255 */ 256 public void setReadTimeout(int timeout) { 257 if (timeout == DEFAULT_READ_TIMEOUT) 258 timeout = defaultSoTimeout; 259 260 if (serverSocket != null && timeout >= 0) { 261 try { 262 serverSocket.setSoTimeout(timeout); 263 } catch(IOException e) { 264 // We tried... 265 } 266 } 267 readTimeout = timeout; 268 } 269 270 public int getReadTimeout() { 271 return readTimeout; 272 } 273 } 274
