754 lines
24 KiB
Java
754 lines
24 KiB
Java
/*
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* Copyright (c) 1995, 2019, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.security.AccessController;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Set;
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import sun.net.ConnectionResetException;
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import sun.net.NetHooks;
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import sun.net.PlatformSocketImpl;
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import sun.net.ResourceManager;
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import sun.net.util.SocketExceptions;
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/**
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* Default Socket Implementation. This implementation does
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* not implement any security checks.
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* Note this class should <b>NOT</b> be public.
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*
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* @author Steven B. Byrne
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*/
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abstract class AbstractPlainSocketImpl extends SocketImpl implements PlatformSocketImpl {
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/* instance variable for SO_TIMEOUT */
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int timeout; // timeout in millisec
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// traffic class
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private int trafficClass;
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private boolean shut_rd = false;
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private boolean shut_wr = false;
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private SocketInputStream socketInputStream = null;
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private SocketOutputStream socketOutputStream = null;
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/* number of threads using the FileDescriptor */
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protected int fdUseCount = 0;
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/* lock when increment/decrementing fdUseCount */
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protected final Object fdLock = new Object();
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/* indicates a close is pending on the file descriptor */
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protected boolean closePending = false;
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/* indicates connection reset state */
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private volatile boolean connectionReset;
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/* indicates whether impl is bound */
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boolean isBound;
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/* indicates whether impl is connected */
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volatile boolean isConnected;
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/* whether this Socket is a stream (TCP) socket or not (UDP)
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*/
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protected boolean stream;
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/**
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* Load net library into runtime.
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*/
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static {
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java.security.AccessController.doPrivileged(
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new java.security.PrivilegedAction<>() {
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public Void run() {
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System.loadLibrary("net");
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return null;
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}
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});
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}
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private static volatile boolean checkedReusePort;
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private static volatile boolean isReusePortAvailable;
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/**
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* Tells whether SO_REUSEPORT is supported.
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*/
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static boolean isReusePortAvailable() {
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if (!checkedReusePort) {
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isReusePortAvailable = isReusePortAvailable0();
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checkedReusePort = true;
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}
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return isReusePortAvailable;
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}
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AbstractPlainSocketImpl(boolean isServer) {
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super(isServer);
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}
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/**
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* Returns a set of SocketOptions supported by this impl and by this impl's
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* socket (Socket or ServerSocket)
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*
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* @return a Set of SocketOptions
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*/
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@Override
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protected Set<SocketOption<?>> supportedOptions() {
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Set<SocketOption<?>> options;
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if (isReusePortAvailable()) {
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options = new HashSet<>();
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options.addAll(super.supportedOptions());
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options.add(StandardSocketOptions.SO_REUSEPORT);
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options = Collections.unmodifiableSet(options);
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} else {
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options = super.supportedOptions();
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}
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return options;
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}
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/**
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* Creates a socket with a boolean that specifies whether this
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* is a stream socket (true) or an unconnected UDP socket (false).
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*/
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protected synchronized void create(boolean stream) throws IOException {
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this.stream = stream;
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if (!stream) {
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ResourceManager.beforeUdpCreate();
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// only create the fd after we know we will be able to create the socket
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fd = new FileDescriptor();
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try {
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socketCreate(false);
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SocketCleanable.register(fd);
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} catch (IOException ioe) {
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ResourceManager.afterUdpClose();
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fd = null;
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throw ioe;
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}
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} else {
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fd = new FileDescriptor();
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socketCreate(true);
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SocketCleanable.register(fd);
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}
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}
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/**
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* Creates a socket and connects it to the specified port on
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* the specified host.
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* @param host the specified host
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* @param port the specified port
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*/
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protected void connect(String host, int port)
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throws UnknownHostException, IOException
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{
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boolean connected = false;
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try {
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InetAddress address = InetAddress.getByName(host);
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this.port = port;
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this.address = address;
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connectToAddress(address, port, timeout);
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connected = true;
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} finally {
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if (!connected) {
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try {
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close();
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} catch (IOException ioe) {
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/* Do nothing. If connect threw an exception then
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it will be passed up the call stack */
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}
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}
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isConnected = connected;
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}
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}
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/**
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* Creates a socket and connects it to the specified address on
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* the specified port.
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* @param address the address
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* @param port the specified port
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*/
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protected void connect(InetAddress address, int port) throws IOException {
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this.port = port;
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this.address = address;
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try {
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connectToAddress(address, port, timeout);
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isConnected = true;
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return;
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} catch (IOException e) {
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// everything failed
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close();
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throw e;
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}
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}
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/**
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* Creates a socket and connects it to the specified address on
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* the specified port.
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* @param address the address
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* @param timeout the timeout value in milliseconds, or zero for no timeout.
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* @throws IOException if connection fails
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* @throws IllegalArgumentException if address is null or is a
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* SocketAddress subclass not supported by this socket
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* @since 1.4
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*/
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protected void connect(SocketAddress address, int timeout)
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throws IOException {
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boolean connected = false;
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try {
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if (address == null || !(address instanceof InetSocketAddress))
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throw new IllegalArgumentException("unsupported address type");
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InetSocketAddress addr = (InetSocketAddress) address;
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if (addr.isUnresolved())
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throw new UnknownHostException(addr.getHostName());
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this.port = addr.getPort();
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this.address = addr.getAddress();
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connectToAddress(this.address, port, timeout);
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connected = true;
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} finally {
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if (!connected) {
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try {
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close();
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} catch (IOException ioe) {
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/* Do nothing. If connect threw an exception then
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it will be passed up the call stack */
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}
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}
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isConnected = connected;
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}
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}
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private void connectToAddress(InetAddress address, int port, int timeout) throws IOException {
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if (address.isAnyLocalAddress()) {
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doConnect(InetAddress.getLocalHost(), port, timeout);
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} else {
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doConnect(address, port, timeout);
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}
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}
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public void setOption(int opt, Object val) throws SocketException {
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if (isClosedOrPending()) {
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throw new SocketException("Socket Closed");
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}
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boolean on = true;
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switch (opt) {
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/* check type safety b4 going native. These should never
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* fail, since only java.Socket* has access to
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* PlainSocketImpl.setOption().
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*/
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case SO_LINGER:
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if (val == null || (!(val instanceof Integer) && !(val instanceof Boolean)))
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throw new SocketException("Bad parameter for option");
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if (val instanceof Boolean) {
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/* true only if disabling - enabling should be Integer */
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on = false;
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}
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break;
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case SO_TIMEOUT:
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if (val == null || (!(val instanceof Integer)))
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throw new SocketException("Bad parameter for SO_TIMEOUT");
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int tmp = ((Integer) val).intValue();
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if (tmp < 0)
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throw new IllegalArgumentException("timeout < 0");
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timeout = tmp;
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break;
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case IP_TOS:
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if (val == null || !(val instanceof Integer)) {
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throw new SocketException("bad argument for IP_TOS");
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}
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trafficClass = ((Integer)val).intValue();
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break;
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case SO_BINDADDR:
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throw new SocketException("Cannot re-bind socket");
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case TCP_NODELAY:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for TCP_NODELAY");
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on = ((Boolean)val).booleanValue();
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break;
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case SO_SNDBUF:
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case SO_RCVBUF:
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if (val == null || !(val instanceof Integer) ||
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!(((Integer)val).intValue() > 0)) {
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throw new SocketException("bad parameter for SO_SNDBUF " +
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"or SO_RCVBUF");
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}
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break;
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case SO_KEEPALIVE:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for SO_KEEPALIVE");
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on = ((Boolean)val).booleanValue();
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break;
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case SO_OOBINLINE:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for SO_OOBINLINE");
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on = ((Boolean)val).booleanValue();
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break;
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case SO_REUSEADDR:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for SO_REUSEADDR");
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on = ((Boolean)val).booleanValue();
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break;
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case SO_REUSEPORT:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for SO_REUSEPORT");
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if (!supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT))
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throw new UnsupportedOperationException("unsupported option");
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on = ((Boolean)val).booleanValue();
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break;
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default:
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throw new SocketException("unrecognized TCP option: " + opt);
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}
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socketSetOption(opt, on, val);
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}
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public Object getOption(int opt) throws SocketException {
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if (isClosedOrPending()) {
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throw new SocketException("Socket Closed");
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}
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if (opt == SO_TIMEOUT) {
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return timeout;
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}
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int ret = 0;
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/*
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* The native socketGetOption() knows about 3 options.
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* The 32 bit value it returns will be interpreted according
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* to what we're asking. A return of -1 means it understands
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* the option but its turned off. It will raise a SocketException
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* if "opt" isn't one it understands.
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*/
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switch (opt) {
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case TCP_NODELAY:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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case SO_OOBINLINE:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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case SO_LINGER:
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ret = socketGetOption(opt, null);
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return (ret == -1) ? Boolean.FALSE: (Object)(ret);
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case SO_REUSEADDR:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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case SO_BINDADDR:
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InetAddressContainer in = new InetAddressContainer();
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ret = socketGetOption(opt, in);
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return in.addr;
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case SO_SNDBUF:
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case SO_RCVBUF:
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ret = socketGetOption(opt, null);
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return ret;
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case IP_TOS:
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try {
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ret = socketGetOption(opt, null);
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if (ret == -1) { // ipv6 tos
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return trafficClass;
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} else {
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return ret;
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}
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} catch (SocketException se) {
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// TODO - should make better effort to read TOS or TCLASS
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return trafficClass; // ipv6 tos
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}
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case SO_KEEPALIVE:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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case SO_REUSEPORT:
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if (!supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {
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throw new UnsupportedOperationException("unsupported option");
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}
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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// should never get here
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default:
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return null;
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}
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}
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/**
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* The workhorse of the connection operation. Tries several times to
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* establish a connection to the given <host, port>. If unsuccessful,
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* throws an IOException indicating what went wrong.
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*/
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synchronized void doConnect(InetAddress address, int port, int timeout) throws IOException {
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synchronized (fdLock) {
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if (!closePending && !isBound) {
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NetHooks.beforeTcpConnect(fd, address, port);
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}
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}
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try {
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acquireFD();
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try {
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socketConnect(address, port, timeout);
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/* socket may have been closed during poll/select */
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synchronized (fdLock) {
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if (closePending) {
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throw new SocketException ("Socket closed");
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}
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}
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} finally {
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releaseFD();
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}
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} catch (IOException e) {
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close();
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throw SocketExceptions.of(e, new InetSocketAddress(address, port));
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}
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}
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/**
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* Binds the socket to the specified address of the specified local port.
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* @param address the address
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* @param lport the port
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*/
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protected synchronized void bind(InetAddress address, int lport)
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throws IOException
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{
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synchronized (fdLock) {
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if (!closePending && !isBound) {
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NetHooks.beforeTcpBind(fd, address, lport);
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}
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}
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socketBind(address, lport);
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isBound = true;
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}
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/**
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* Listens, for a specified amount of time, for connections.
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* @param count the amount of time to listen for connections
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*/
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protected synchronized void listen(int count) throws IOException {
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socketListen(count);
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}
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/**
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* Accepts connections.
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* @param si the socket impl
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*/
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protected void accept(SocketImpl si) throws IOException {
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si.fd = new FileDescriptor();
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acquireFD();
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try {
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socketAccept(si);
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} finally {
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releaseFD();
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}
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SocketCleanable.register(si.fd);
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}
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/**
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* Gets an InputStream for this socket.
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*/
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protected synchronized InputStream getInputStream() throws IOException {
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synchronized (fdLock) {
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if (isClosedOrPending())
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throw new IOException("Socket Closed");
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if (shut_rd)
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throw new IOException("Socket input is shutdown");
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if (socketInputStream == null) {
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PrivilegedExceptionAction<SocketInputStream> pa = () -> new SocketInputStream(this);
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try {
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socketInputStream = AccessController.doPrivileged(pa);
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} catch (PrivilegedActionException e) {
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throw (IOException) e.getCause();
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}
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}
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}
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return socketInputStream;
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}
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void setInputStream(SocketInputStream in) {
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socketInputStream = in;
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}
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/**
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* Gets an OutputStream for this socket.
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*/
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protected synchronized OutputStream getOutputStream() throws IOException {
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synchronized (fdLock) {
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if (isClosedOrPending())
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throw new IOException("Socket Closed");
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if (shut_wr)
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throw new IOException("Socket output is shutdown");
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if (socketOutputStream == null) {
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PrivilegedExceptionAction<SocketOutputStream> pa = () -> new SocketOutputStream(this);
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try {
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socketOutputStream = AccessController.doPrivileged(pa);
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} catch (PrivilegedActionException e) {
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throw (IOException) e.getCause();
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}
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}
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}
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return socketOutputStream;
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}
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void setFileDescriptor(FileDescriptor fd) {
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this.fd = fd;
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}
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void setAddress(InetAddress address) {
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this.address = address;
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}
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void setPort(int port) {
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this.port = port;
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}
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void setLocalPort(int localport) {
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this.localport = localport;
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}
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/**
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* Returns the number of bytes that can be read without blocking.
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*/
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protected synchronized int available() throws IOException {
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if (isClosedOrPending()) {
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throw new IOException("Stream closed.");
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}
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/*
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* If connection has been reset or shut down for input, then return 0
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* to indicate there are no buffered bytes.
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*/
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if (isConnectionReset() || shut_rd) {
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return 0;
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}
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/*
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* If no bytes available and we were previously notified
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* of a connection reset then we move to the reset state.
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*
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* If are notified of a connection reset then check
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* again if there are bytes buffered on the socket.
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*/
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int n = 0;
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try {
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n = socketAvailable();
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} catch (ConnectionResetException exc1) {
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setConnectionReset();
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}
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return n;
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}
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/**
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* Closes the socket.
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*/
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protected void close() throws IOException {
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synchronized(fdLock) {
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if (fd != null) {
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if (!stream) {
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ResourceManager.afterUdpClose();
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}
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if (fdUseCount == 0) {
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if (closePending) {
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return;
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}
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closePending = true;
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|
/*
|
|
* We close the FileDescriptor in two-steps - first the
|
|
* "pre-close" which closes the socket but doesn't
|
|
* release the underlying file descriptor. This operation
|
|
* may be lengthy due to untransmitted data and a long
|
|
* linger interval. Once the pre-close is done we do the
|
|
* actual socket to release the fd.
|
|
*/
|
|
try {
|
|
socketPreClose();
|
|
} finally {
|
|
socketClose();
|
|
}
|
|
fd = null;
|
|
return;
|
|
} else {
|
|
/*
|
|
* If a thread has acquired the fd and a close
|
|
* isn't pending then use a deferred close.
|
|
* Also decrement fdUseCount to signal the last
|
|
* thread that releases the fd to close it.
|
|
*/
|
|
if (!closePending) {
|
|
closePending = true;
|
|
fdUseCount--;
|
|
socketPreClose();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void reset() {
|
|
throw new InternalError("should not get here");
|
|
}
|
|
|
|
/**
|
|
* Shutdown read-half of the socket connection;
|
|
*/
|
|
protected void shutdownInput() throws IOException {
|
|
if (fd != null) {
|
|
socketShutdown(SHUT_RD);
|
|
if (socketInputStream != null) {
|
|
socketInputStream.setEOF(true);
|
|
}
|
|
shut_rd = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Shutdown write-half of the socket connection;
|
|
*/
|
|
protected void shutdownOutput() throws IOException {
|
|
if (fd != null) {
|
|
socketShutdown(SHUT_WR);
|
|
shut_wr = true;
|
|
}
|
|
}
|
|
|
|
protected boolean supportsUrgentData () {
|
|
return true;
|
|
}
|
|
|
|
protected void sendUrgentData (int data) throws IOException {
|
|
if (fd == null) {
|
|
throw new IOException("Socket Closed");
|
|
}
|
|
socketSendUrgentData (data);
|
|
}
|
|
|
|
/*
|
|
* "Acquires" and returns the FileDescriptor for this impl
|
|
*
|
|
* A corresponding releaseFD is required to "release" the
|
|
* FileDescriptor.
|
|
*/
|
|
FileDescriptor acquireFD() {
|
|
synchronized (fdLock) {
|
|
fdUseCount++;
|
|
return fd;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* "Release" the FileDescriptor for this impl.
|
|
*
|
|
* If the use count goes to -1 then the socket is closed.
|
|
*/
|
|
void releaseFD() {
|
|
synchronized (fdLock) {
|
|
fdUseCount--;
|
|
if (fdUseCount == -1) {
|
|
if (fd != null) {
|
|
try {
|
|
socketClose();
|
|
} catch (IOException e) {
|
|
} finally {
|
|
fd = null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
boolean isConnectionReset() {
|
|
return connectionReset;
|
|
}
|
|
|
|
void setConnectionReset() {
|
|
connectionReset = true;
|
|
}
|
|
|
|
/*
|
|
* Return true if already closed or close is pending
|
|
*/
|
|
public boolean isClosedOrPending() {
|
|
/*
|
|
* Lock on fdLock to ensure that we wait if a
|
|
* close is in progress.
|
|
*/
|
|
synchronized (fdLock) {
|
|
if (closePending || (fd == null)) {
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return the current value of SO_TIMEOUT
|
|
*/
|
|
public int getTimeout() {
|
|
return timeout;
|
|
}
|
|
|
|
/*
|
|
* "Pre-close" a socket by dup'ing the file descriptor - this enables
|
|
* the socket to be closed without releasing the file descriptor.
|
|
*/
|
|
private void socketPreClose() throws IOException {
|
|
socketClose0(true);
|
|
}
|
|
|
|
/*
|
|
* Close the socket (and release the file descriptor).
|
|
*/
|
|
protected void socketClose() throws IOException {
|
|
SocketCleanable.unregister(fd);
|
|
socketClose0(false);
|
|
}
|
|
|
|
abstract void socketCreate(boolean stream) throws IOException;
|
|
abstract void socketConnect(InetAddress address, int port, int timeout)
|
|
throws IOException;
|
|
abstract void socketBind(InetAddress address, int port)
|
|
throws IOException;
|
|
abstract void socketListen(int count)
|
|
throws IOException;
|
|
abstract void socketAccept(SocketImpl s)
|
|
throws IOException;
|
|
abstract int socketAvailable()
|
|
throws IOException;
|
|
abstract void socketClose0(boolean useDeferredClose)
|
|
throws IOException;
|
|
abstract void socketShutdown(int howto)
|
|
throws IOException;
|
|
abstract void socketSetOption(int cmd, boolean on, Object value)
|
|
throws SocketException;
|
|
abstract int socketGetOption(int opt, Object iaContainerObj) throws SocketException;
|
|
abstract void socketSendUrgentData(int data)
|
|
throws IOException;
|
|
|
|
public static final int SHUT_RD = 0;
|
|
public static final int SHUT_WR = 1;
|
|
|
|
private static native boolean isReusePortAvailable0();
|
|
}
|