1 /* 2 * Copyright (c) 1994, 2008, 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 protected Proxy proxy = Proxy.NO_PROXY; 44 /** Socket for communicating with server. */ 45 protected Socket serverSocket = null; 46 47 /** Stream for printing to the server. */ 48 public PrintStream serverOutput; 49 50 /** Buffered stream for reading replies from server. */ 51 public InputStream serverInput; 52 53 protected static int defaultSoTimeout; 54 protected static int defaultConnectTimeout; 55 56 protected int readTimeout = -1; 57 protected int connectTimeout = -1; 58 /* Name of encoding to use for output */ 59 protected static String encoding; 60 61 static { 62 final int vals[] = {0, 0}; 63 final String encs[] = { null }; 64 65 AccessController.doPrivileged( 66 new PrivilegedAction<Void>() { 67 public Void run() { 68 vals[0] = Integer.getInteger("sun.net.client.defaultReadTimeout", 0).intValue(); 69 vals[1] = Integer.getInteger("sun.net.client.defaultConnectTimeout", 0).intValue(); 70 encs[0] = System.getProperty("file.encoding", "ISO8859_1"); 71 return null; 72 } 73 }); 74 if (vals[0] == 0) 75 defaultSoTimeout = -1; 76 else 77 defaultSoTimeout = vals[0]; 78 79 if (vals[1] == 0) 80 defaultConnectTimeout = -1; 81 else 82 defaultConnectTimeout = vals[1]; 83 84 85 encoding = encs[0]; 86 try { 87 if (!isASCIISuperset (encoding)) { 88 encoding = "ISO8859_1"; 89 } 90 } catch (Exception e) { 91 encoding = "ISO8859_1"; 92 } 93 } 94 95 96 /** 97 * Test the named character encoding to verify that it converts ASCII 98 * characters correctly. We have to use an ASCII based encoding, or else 99 * the NetworkClients will not work correctly in EBCDIC based systems. 100 * However, we cannot just use ASCII or ISO8859_1 universally, because in 101 * Asian locales, non-ASCII characters may be embedded in otherwise 102 * ASCII based protocols (eg. HTTP). The specifications (RFC2616, 2398) 103 * are a little ambiguous in this matter. For instance, RFC2398 [part 2.1] 104 * says that the HTTP request URI should be escaped using a defined 105 * mechanism, but there is no way to specify in the escaped string what 106 * the original character set is. It is not correct to assume that 107 * UTF-8 is always used (as in URLs in HTML 4.0). For this reason, 108 * until the specifications are updated to deal with this issue more 109 * comprehensively, and more importantly, HTTP servers are known to 110 * support these mechanisms, we will maintain the current behavior 111 * where it is possible to send non-ASCII characters in their original 112 * unescaped form. 113 */ 114 private static boolean isASCIISuperset (String encoding) throws Exception { 115 String chkS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"+ 116 "abcdefghijklmnopqrstuvwxyz-_.!~*'();/?:@&=+$,"; 117 118 // Expected byte sequence for string above 119 byte[] chkB = { 48,49,50,51,52,53,54,55,56,57,65,66,67,68,69,70,71,72, 120 73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,97,98,99, 121 100,101,102,103,104,105,106,107,108,109,110,111,112,113,114, 122 115,116,117,118,119,120,121,122,45,95,46,33,126,42,39,40,41,59, 123 47,63,58,64,38,61,43,36,44}; 124 125 byte[] b = chkS.getBytes (encoding); 126 return Arrays.equals (b, chkB); 127 } 128 129 /** Open a connection to the server. */ 130 public void openServer(String server, int port) 131 throws IOException, UnknownHostException { 132 if (serverSocket != null) 133 closeServer(); 134 serverSocket = doConnect (server, port); 135 try { 136 serverOutput = new PrintStream(new BufferedOutputStream( 137 serverSocket.getOutputStream()), 138 true, encoding); 139 } catch (UnsupportedEncodingException e) { 140 throw new InternalError(encoding +"encoding not found"); 141 } 142 serverInput = new BufferedInputStream(serverSocket.getInputStream()); 143 } 144 145 /** 146 * Return a socket connected to the server, with any 147 * appropriate options pre-established 148 */ 149 protected Socket doConnect (String server, int port) 150 throws IOException, UnknownHostException { 151 Socket s; 152 if (proxy != null) { 153 if (proxy.type() == Proxy.Type.SOCKS) { 154 s = AccessController.doPrivileged( 155 new PrivilegedAction<Socket>() { 156 public Socket run() { 157 return new Socket(proxy); 158 }}); 159 } else if (proxy.type() == Proxy.Type.DIRECT) { 160 s = createSocket(); 161 } else { 162 // Still connecting through a proxy 163 // server & port will be the proxy address and port 164 s = new Socket(Proxy.NO_PROXY); 165 } 166 } else 167 s = createSocket(); 168 // Instance specific timeouts do have priority, that means 169 // connectTimeout & readTimeout (-1 means not set) 170 // Then global default timeouts 171 // Then no timeout. 172 if (connectTimeout >= 0) { 173 s.connect(new InetSocketAddress(server, port), connectTimeout); 174 } else { 175 if (defaultConnectTimeout > 0) { 176 s.connect(new InetSocketAddress(server, port), defaultConnectTimeout); 177 } else { 178 s.connect(new InetSocketAddress(server, port)); 179 } 180 } 181 if (readTimeout >= 0) 182 s.setSoTimeout(readTimeout); 183 else if (defaultSoTimeout > 0) { 184 s.setSoTimeout(defaultSoTimeout); 185 } 186 return s; 187 } 188 189 /** 190 * The following method, createSocket, is provided to allow the 191 * https client to override it so that it may use its socket factory 192 * to create the socket. 193 */ 194 protected Socket createSocket() throws IOException { 195 return new java.net.Socket(); 196 } 197 198 protected InetAddress getLocalAddress() throws IOException { 199 if (serverSocket == null) 200 throw new IOException("not connected"); 201 return serverSocket.getLocalAddress(); 202 } 203 204 /** Close an open connection to the server. */ 205 public void closeServer() throws IOException { 206 if (! serverIsOpen()) { 207 return; 208 } 209 serverSocket.close(); 210 serverSocket = null; 211 serverInput = null; 212 serverOutput = null; 213 } 214 215 /** Return server connection status */ 216 public boolean serverIsOpen() { 217 return serverSocket != null; 218 } 219 220 /** Create connection with host <i>host</i> on port <i>port</i> */ 221 public NetworkClient(String host, int port) throws IOException { 222 openServer(host, port); 223 } 224 225 public NetworkClient() {} 226 227 public void setConnectTimeout(int timeout) { 228 connectTimeout = timeout; 229 } 230 231 public int getConnectTimeout() { 232 return connectTimeout; 233 } 234 235 public void setReadTimeout(int timeout) { 236 if (serverSocket != null && timeout >= 0) { 237 try { 238 serverSocket.setSoTimeout(timeout); 239 } catch(IOException e) { 240 // We tried... 241 } 242 } 243 readTimeout = timeout; 244 } 245 246 public int getReadTimeout() { 247 return readTimeout; 248 } 249 } --- EOF ---