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/*
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* Copyright 1994-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.net;
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import java.io.*;
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import java.net.Socket;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.UnknownHostException;
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import java.net.URL;
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import java.net.Proxy;
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import java.util.Arrays;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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/**
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* This is the base class for network clients.
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*
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* @author Jonathan Payne
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*/
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public class NetworkClient {
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protected Proxy proxy = Proxy.NO_PROXY;
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/** Socket for communicating with server. */
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protected Socket serverSocket = null;
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/** Stream for printing to the server. */
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public PrintStream serverOutput;
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/** Buffered stream for reading replies from server. */
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public InputStream serverInput;
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protected static int defaultSoTimeout;
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protected static int defaultConnectTimeout;
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protected int readTimeout = -1;
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protected int connectTimeout = -1;
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/* Name of encoding to use for output */
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protected static String encoding;
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static {
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final int vals[] = {0, 0};
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final String encs[] = { null };
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AccessController.doPrivileged(
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new PrivilegedAction<Void>() {
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public Void run() {
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vals[0] = Integer.getInteger("sun.net.client.defaultReadTimeout", 0).intValue();
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vals[1] = Integer.getInteger("sun.net.client.defaultConnectTimeout", 0).intValue();
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encs[0] = System.getProperty("file.encoding", "ISO8859_1");
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return null;
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}
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});
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if (vals[0] == 0)
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defaultSoTimeout = -1;
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else
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defaultSoTimeout = vals[0];
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if (vals[1] == 0)
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defaultConnectTimeout = -1;
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else
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defaultConnectTimeout = vals[1];
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encoding = encs[0];
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try {
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if (!isASCIISuperset (encoding)) {
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encoding = "ISO8859_1";
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}
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} catch (Exception e) {
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encoding = "ISO8859_1";
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}
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}
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/**
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* Test the named character encoding to verify that it converts ASCII
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* characters correctly. We have to use an ASCII based encoding, or else
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* the NetworkClients will not work correctly in EBCDIC based systems.
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* However, we cannot just use ASCII or ISO8859_1 universally, because in
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* Asian locales, non-ASCII characters may be embedded in otherwise
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* ASCII based protocols (eg. HTTP). The specifications (RFC2616, 2398)
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* are a little ambiguous in this matter. For instance, RFC2398 [part 2.1]
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* says that the HTTP request URI should be escaped using a defined
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* mechanism, but there is no way to specify in the escaped string what
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* the original character set is. It is not correct to assume that
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* UTF-8 is always used (as in URLs in HTML 4.0). For this reason,
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* until the specifications are updated to deal with this issue more
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* comprehensively, and more importantly, HTTP servers are known to
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* support these mechanisms, we will maintain the current behavior
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* where it is possible to send non-ASCII characters in their original
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* unescaped form.
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*/
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private static boolean isASCIISuperset (String encoding) throws Exception {
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String chkS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"+
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"abcdefghijklmnopqrstuvwxyz-_.!~*'();/?:@&=+$,";
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// Expected byte sequence for string above
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byte[] chkB = { 48,49,50,51,52,53,54,55,56,57,65,66,67,68,69,70,71,72,
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73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,97,98,99,
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100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,
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115,116,117,118,119,120,121,122,45,95,46,33,126,42,39,40,41,59,
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47,63,58,64,38,61,43,36,44};
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byte[] b = chkS.getBytes (encoding);
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return Arrays.equals (b, chkB);
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}
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/** Open a connection to the server. */
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public void openServer(String server, int port)
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throws IOException, UnknownHostException {
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if (serverSocket != null)
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closeServer();
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serverSocket = doConnect (server, port);
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try {
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serverOutput = new PrintStream(new BufferedOutputStream(
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serverSocket.getOutputStream()),
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true, encoding);
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} catch (UnsupportedEncodingException e) {
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throw new InternalError(encoding +"encoding not found");
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}
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serverInput = new BufferedInputStream(serverSocket.getInputStream());
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}
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/**
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* Return a socket connected to the server, with any
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* appropriate options pre-established
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*/
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protected Socket doConnect (String server, int port)
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throws IOException, UnknownHostException {
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Socket s;
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if (proxy != null) {
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if (proxy.type() == Proxy.Type.SOCKS) {
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s = AccessController.doPrivileged(
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new PrivilegedAction<Socket>() {
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public Socket run() {
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return new Socket(proxy);
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}});
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} else
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s = new Socket(Proxy.NO_PROXY);
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} else
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s = new Socket();
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// Instance specific timeouts do have priority, that means
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// connectTimeout & readTimeout (-1 means not set)
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// Then global default timeouts
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// Then no timeout.
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if (connectTimeout >= 0) {
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s.connect(new InetSocketAddress(server, port), connectTimeout);
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} else {
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if (defaultConnectTimeout > 0) {
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s.connect(new InetSocketAddress(server, port), defaultConnectTimeout);
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} else {
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s.connect(new InetSocketAddress(server, port));
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}
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}
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if (readTimeout >= 0)
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s.setSoTimeout(readTimeout);
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else if (defaultSoTimeout > 0) {
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s.setSoTimeout(defaultSoTimeout);
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}
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return s;
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}
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protected InetAddress getLocalAddress() throws IOException {
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if (serverSocket == null)
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throw new IOException("not connected");
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return serverSocket.getLocalAddress();
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}
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/** Close an open connection to the server. */
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public void closeServer() throws IOException {
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if (! serverIsOpen()) {
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return;
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}
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serverSocket.close();
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serverSocket = null;
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serverInput = null;
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serverOutput = null;
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}
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/** Return server connection status */
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public boolean serverIsOpen() {
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return serverSocket != null;
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}
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/** Create connection with host <i>host</i> on port <i>port</i> */
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public NetworkClient(String host, int port) throws IOException {
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openServer(host, port);
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}
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public NetworkClient() {}
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public void setConnectTimeout(int timeout) {
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connectTimeout = timeout;
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}
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public int getConnectTimeout() {
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return connectTimeout;
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}
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public void setReadTimeout(int timeout) {
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if (serverSocket != null && timeout >= 0) {
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try {
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serverSocket.setSoTimeout(timeout);
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} catch(IOException e) {
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// We tried...
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}
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}
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readTimeout = timeout;
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}
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public int getReadTimeout() {
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return readTimeout;
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}
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}
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