commons-net.jar Source Code
commons-net.jar is the bytecode of Apache Commons Net library,
which implements the client side of many basic Internet protocols.
Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.
The source code of commons-net-3.8.0.jar is provided below:
✍: FYIcenter
⏎ org/apache/commons/net/SocketClient.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.net;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;
import java.net.SocketException;
import java.nio.charset.Charset;
import javax.net.ServerSocketFactory;
import javax.net.SocketFactory;
/**
* The SocketClient provides the basic operations that are required of
* client objects accessing sockets. It is meant to be
* subclassed to avoid having to rewrite the same code over and over again
* to open a socket, close a socket, set timeouts, etc. Of special note
* is the {@link #setSocketFactory setSocketFactory }
* method, which allows you to control the type of Socket the SocketClient
* creates for initiating network connections. This is especially useful
* for adding SSL or proxy support as well as better support for applets. For
* example, you could create a
* {@link javax.net.SocketFactory} that
* requests browser security capabilities before creating a socket.
* All classes derived from SocketClient should use the
* {@link #_socketFactory_ _socketFactory_ } member variable to
* create Socket and ServerSocket instances rather than instantiating
* them by directly invoking a constructor. By honoring this contract
* you guarantee that a user will always be able to provide his own
* Socket implementations by substituting his own SocketFactory.
* @see SocketFactory
*/
public abstract class SocketClient
{
/**
* The end of line character sequence used by most IETF protocols. That
* is a carriage return followed by a newline: "\r\n"
*/
public static final String NETASCII_EOL = "\r\n";
/** The default SocketFactory shared by all SocketClient instances. */
private static final SocketFactory DEFAULT_SOCKET_FACTORY =
SocketFactory.getDefault();
/** The default {@link ServerSocketFactory} */
private static final ServerSocketFactory DEFAULT_SERVER_SOCKET_FACTORY =
ServerSocketFactory.getDefault();
/**
* A ProtocolCommandSupport object used to manage the registering of
* ProtocolCommandListeners and the firing of ProtocolCommandEvents.
*/
private ProtocolCommandSupport commandSupport;
/** The timeout to use after opening a socket. */
protected int _timeout_;
/** The socket used for the connection. */
protected Socket _socket_;
/** The hostname used for the connection (null = no hostname supplied). */
protected String _hostname_;
/** The default port the client should connect to. */
protected int _defaultPort_;
/** The socket's InputStream. */
protected InputStream _input_;
/** The socket's OutputStream. */
protected OutputStream _output_;
/** The socket's SocketFactory. */
protected SocketFactory _socketFactory_;
/** The socket's ServerSocket Factory. */
protected ServerSocketFactory _serverSocketFactory_;
/** The socket's connect timeout (0 = infinite timeout) */
private static final int DEFAULT_CONNECT_TIMEOUT = 60000;
protected int connectTimeout = DEFAULT_CONNECT_TIMEOUT;
/** Hint for SO_RCVBUF size */
private int receiveBufferSize = -1;
/** Hint for SO_SNDBUF size */
private int sendBufferSize = -1;
/** The proxy to use when connecting. */
private Proxy connProxy;
/**
* Charset to use for byte IO.
*/
private Charset charset = Charset.defaultCharset();
/**
* Default constructor for SocketClient. Initializes
* _socket_ to null, _timeout_ to 0, _defaultPort to 0,
* _isConnected_ to false, charset to {@code Charset.defaultCharset()}
* and _socketFactory_ to a shared instance of
* {@link org.apache.commons.net.DefaultSocketFactory}.
*/
public SocketClient()
{
_socket_ = null;
_hostname_ = null;
_input_ = null;
_output_ = null;
_timeout_ = 0;
_defaultPort_ = 0;
_socketFactory_ = DEFAULT_SOCKET_FACTORY;
_serverSocketFactory_ = DEFAULT_SERVER_SOCKET_FACTORY;
}
/**
* Because there are so many connect() methods, the _connectAction_()
* method is provided as a means of performing some action immediately
* after establishing a connection, rather than reimplementing all
* of the connect() methods. The last action performed by every
* connect() method after opening a socket is to call this method.
* <p>
* This method sets the timeout on the just opened socket to the default
* timeout set by {@link #setDefaultTimeout setDefaultTimeout() },
* sets _input_ and _output_ to the socket's InputStream and OutputStream
* respectively, and sets _isConnected_ to true.
* <p>
* Subclasses overriding this method should start by calling
* <code> super._connectAction_() </code> first to ensure the
* initialization of the aforementioned protected variables.
* @throws IOException (SocketException) if a problem occurs with the socket
*/
protected void _connectAction_() throws IOException
{
applySocketAttributes();
_input_ = _socket_.getInputStream();
_output_ = _socket_.getOutputStream();
}
/**
* Applies socket attributes.
*
* @throws SocketException if there is an error in the underlying protocol, such as a TCP error.
* @since 3.8.0
*/
protected void applySocketAttributes() throws SocketException {
_socket_.setSoTimeout(_timeout_);
}
/**
* Opens a Socket connected to a remote host at the specified port and
* originating from the current host at a system assigned port.
* Before returning, {@link #_connectAction_ _connectAction_() }
* is called to perform connection initialization actions.
* <p>
* @param host The remote host.
* @param port The port to connect to on the remote host.
* @throws SocketException If the socket timeout could not be set.
* @throws IOException If the socket could not be opened. In most
* cases you will only want to catch IOException since SocketException is
* derived from it.
*/
public void connect(final InetAddress host, final int port)
throws SocketException, IOException
{
_hostname_ = null;
_connect(host, port, null, -1);
}
/**
* Opens a Socket connected to a remote host at the specified port and
* originating from the current host at a system assigned port.
* Before returning, {@link #_connectAction_ _connectAction_() }
* is called to perform connection initialization actions.
* <p>
* @param hostname The name of the remote host.
* @param port The port to connect to on the remote host.
* @throws SocketException If the socket timeout could not be set.
* @throws IOException If the socket could not be opened. In most
* cases you will only want to catch IOException since SocketException is
* derived from it.
* @throws java.net.UnknownHostException If the hostname cannot be resolved.
*/
public void connect(final String hostname, final int port)
throws SocketException, IOException
{
_hostname_ = hostname;
_connect(InetAddress.getByName(hostname), port, null, -1);
}
/**
* Opens a Socket connected to a remote host at the specified port and
* originating from the specified local address and port.
* Before returning, {@link #_connectAction_ _connectAction_() }
* is called to perform connection initialization actions.
* <p>
* @param host The remote host.
* @param port The port to connect to on the remote host.
* @param localAddr The local address to use.
* @param localPort The local port to use.
* @throws SocketException If the socket timeout could not be set.
* @throws IOException If the socket could not be opened. In most
* cases you will only want to catch IOException since SocketException is
* derived from it.
*/
public void connect(final InetAddress host, final int port,
final InetAddress localAddr, final int localPort)
throws SocketException, IOException
{
_hostname_ = null;
_connect(host, port, localAddr, localPort);
}
// helper method to allow code to be shared with connect(String,...) methods
private void _connect(final InetAddress host, final int port, final InetAddress localAddr, final int localPort)
throws SocketException, IOException
{
_socket_ = _socketFactory_.createSocket();
if (receiveBufferSize != -1) {
_socket_.setReceiveBufferSize(receiveBufferSize);
}
if (sendBufferSize != -1) {
_socket_.setSendBufferSize(sendBufferSize);
}
if (localAddr != null) {
_socket_.bind(new InetSocketAddress(localAddr, localPort));
}
_socket_.connect(new InetSocketAddress(host, port), connectTimeout);
_connectAction_();
}
/**
* Opens a Socket connected to a remote host at the specified port and
* originating from the specified local address and port.
* Before returning, {@link #_connectAction_ _connectAction_() }
* is called to perform connection initialization actions.
* <p>
* @param hostname The name of the remote host.
* @param port The port to connect to on the remote host.
* @param localAddr The local address to use.
* @param localPort The local port to use.
* @throws SocketException If the socket timeout could not be set.
* @throws IOException If the socket could not be opened. In most
* cases you will only want to catch IOException since SocketException is
* derived from it.
* @throws java.net.UnknownHostException If the hostname cannot be resolved.
*/
public void connect(final String hostname, final int port,
final InetAddress localAddr, final int localPort)
throws SocketException, IOException
{
_hostname_ = hostname;
_connect(InetAddress.getByName(hostname), port, localAddr, localPort);
}
/**
* Opens a Socket connected to a remote host at the current default port
* and originating from the current host at a system assigned port.
* Before returning, {@link #_connectAction_ _connectAction_() }
* is called to perform connection initialization actions.
* <p>
* @param host The remote host.
* @throws SocketException If the socket timeout could not be set.
* @throws IOException If the socket could not be opened. In most
* cases you will only want to catch IOException since SocketException is
* derived from it.
*/
public void connect(final InetAddress host) throws SocketException, IOException
{
_hostname_ = null;
connect(host, _defaultPort_);
}
/**
* Opens a Socket connected to a remote host at the current default
* port and originating from the current host at a system assigned port.
* Before returning, {@link #_connectAction_ _connectAction_() }
* is called to perform connection initialization actions.
* <p>
* @param hostname The name of the remote host.
* @throws SocketException If the socket timeout could not be set.
* @throws IOException If the socket could not be opened. In most
* cases you will only want to catch IOException since SocketException is
* derived from it.
* @throws java.net.UnknownHostException If the hostname cannot be resolved.
*/
public void connect(final String hostname) throws SocketException, IOException
{
connect(hostname, _defaultPort_);
}
/**
* Disconnects the socket connection.
* You should call this method after you've finished using the class
* instance and also before you call
* {@link #connect connect() }
* again. _isConnected_ is set to false, _socket_ is set to null,
* _input_ is set to null, and _output_ is set to null.
* <p>
* @throws IOException If there is an error closing the socket.
*/
public void disconnect() throws IOException
{
closeQuietly(_socket_);
closeQuietly(_input_);
closeQuietly(_output_);
_socket_ = null;
_hostname_ = null;
_input_ = null;
_output_ = null;
}
private void closeQuietly(final Socket socket) {
if (socket != null){
try {
socket.close();
} catch (final IOException e) {
// Ignored
}
}
}
private void closeQuietly(final Closeable close){
if (close != null){
try {
close.close();
} catch (final IOException e) {
// Ignored
}
}
}
/**
* Returns true if the client is currently connected to a server.
* <p>
* Delegates to {@link Socket#isConnected()}
* @return True if the client is currently connected to a server,
* false otherwise.
*/
public boolean isConnected()
{
if (_socket_ == null) {
return false;
}
return _socket_.isConnected();
}
/**
* Make various checks on the socket to test if it is available for use.
* Note that the only sure test is to use it, but these checks may help
* in some cases.
* @see <a href="https://issues.apache.org/jira/browse/NET-350">NET-350</a>
* @return {@code true} if the socket appears to be available for use
* @since 3.0
*/
@SuppressWarnings("resource")
public boolean isAvailable(){
if (isConnected()) {
try
{
if (_socket_.getInetAddress() == null) {
return false;
}
if (_socket_.getPort() == 0) {
return false;
}
if (_socket_.getRemoteSocketAddress() == null) {
return false;
}
if (_socket_.isClosed()) {
return false;
}
/* these aren't exact checks (a Socket can be half-open),
but since we usually require two-way data transfer,
we check these here too: */
if (_socket_.isInputShutdown()) {
return false;
}
if (_socket_.isOutputShutdown()) {
return false;
}
/* ignore the result, catch exceptions: */
// No need to close
_socket_.getInputStream();
// No need to close
_socket_.getOutputStream();
}
catch (final IOException ioex)
{
return false;
}
return true;
}
return false;
}
/**
* Sets the default port the SocketClient should connect to when a port
* is not specified. The {@link #_defaultPort_ _defaultPort_ }
* variable stores this value. If never set, the default port is equal
* to zero.
* <p>
* @param port The default port to set.
*/
public void setDefaultPort(final int port)
{
_defaultPort_ = port;
}
/**
* Returns the current value of the default port (stored in
* {@link #_defaultPort_ _defaultPort_ }).
* <p>
* @return The current value of the default port.
*/
public int getDefaultPort()
{
return _defaultPort_;
}
/**
* Set the default timeout in milliseconds to use when opening a socket.
* This value is only used previous to a call to
* {@link #connect connect()}
* and should not be confused with {@link #setSoTimeout setSoTimeout()}
* which operates on an the currently opened socket. _timeout_ contains
* the new timeout value.
* <p>
* @param timeout The timeout in milliseconds to use for the socket
* connection.
*/
public void setDefaultTimeout(final int timeout)
{
_timeout_ = timeout;
}
/**
* Returns the default timeout in milliseconds that is used when
* opening a socket.
* <p>
* @return The default timeout in milliseconds that is used when
* opening a socket.
*/
public int getDefaultTimeout()
{
return _timeout_;
}
/**
* Set the timeout in milliseconds of a currently open connection.
* Only call this method after a connection has been opened
* by {@link #connect connect()}.
* <p>
* To set the initial timeout, use {@link #setDefaultTimeout(int)} instead.
*
* @param timeout The timeout in milliseconds to use for the currently
* open socket connection.
* @throws SocketException If the operation fails.
* @throws NullPointerException if the socket is not currently open
*/
public void setSoTimeout(final int timeout) throws SocketException
{
_socket_.setSoTimeout(timeout);
}
/**
* Set the underlying socket send buffer size.
* <p>
* @param size The size of the buffer in bytes.
* @throws SocketException never thrown, but subclasses might want to do so
* @since 2.0
*/
public void setSendBufferSize(final int size) throws SocketException {
sendBufferSize = size;
}
/**
* Get the current sendBuffer size
* @return the size, or -1 if not initialized
* @since 3.0
*/
protected int getSendBufferSize(){
return sendBufferSize;
}
/**
* Sets the underlying socket receive buffer size.
* <p>
* @param size The size of the buffer in bytes.
* @throws SocketException never (but subclasses may wish to do so)
* @since 2.0
*/
public void setReceiveBufferSize(final int size) throws SocketException {
receiveBufferSize = size;
}
/**
* Get the current receivedBuffer size
* @return the size, or -1 if not initialized
* @since 3.0
*/
protected int getReceiveBufferSize(){
return receiveBufferSize;
}
/**
* Returns the timeout in milliseconds of the currently opened socket.
* <p>
* @return The timeout in milliseconds of the currently opened socket.
* @throws SocketException If the operation fails.
* @throws NullPointerException if the socket is not currently open
*/
public int getSoTimeout() throws SocketException
{
return _socket_.getSoTimeout();
}
/**
* Enables or disables the Nagle's algorithm (TCP_NODELAY) on the
* currently opened socket.
* <p>
* @param on True if Nagle's algorithm is to be enabled, false if not.
* @throws SocketException If the operation fails.
* @throws NullPointerException if the socket is not currently open
*/
public void setTcpNoDelay(final boolean on) throws SocketException
{
_socket_.setTcpNoDelay(on);
}
/**
* Returns true if Nagle's algorithm is enabled on the currently opened
* socket.
* <p>
* @return True if Nagle's algorithm is enabled on the currently opened
* socket, false otherwise.
* @throws SocketException If the operation fails.
* @throws NullPointerException if the socket is not currently open
*/
public boolean getTcpNoDelay() throws SocketException
{
return _socket_.getTcpNoDelay();
}
/**
* Sets the SO_KEEPALIVE flag on the currently opened socket.
*
* From the Javadocs, the default keepalive time is 2 hours (although this is
* implementation dependent). It looks as though the Windows WSA sockets implementation
* allows a specific keepalive value to be set, although this seems not to be the case on
* other systems.
* @param keepAlive If true, keepAlive is turned on
* @throws SocketException if there is a problem with the socket
* @throws NullPointerException if the socket is not currently open
* @since 2.2
*/
public void setKeepAlive(final boolean keepAlive) throws SocketException {
_socket_.setKeepAlive(keepAlive);
}
/**
* Returns the current value of the SO_KEEPALIVE flag on the currently opened socket.
* Delegates to {@link Socket#getKeepAlive()}
* @return True if SO_KEEPALIVE is enabled.
* @throws SocketException if there is a problem with the socket
* @throws NullPointerException if the socket is not currently open
* @since 2.2
*/
public boolean getKeepAlive() throws SocketException {
return _socket_.getKeepAlive();
}
/**
* Sets the SO_LINGER timeout on the currently opened socket.
* <p>
* @param on True if linger is to be enabled, false if not.
* @param val The linger timeout (in hundredths of a second?)
* @throws SocketException If the operation fails.
* @throws NullPointerException if the socket is not currently open
*/
public void setSoLinger(final boolean on, final int val) throws SocketException
{
_socket_.setSoLinger(on, val);
}
/**
* Returns the current SO_LINGER timeout of the currently opened socket.
* <p>
* @return The current SO_LINGER timeout. If SO_LINGER is disabled returns
* -1.
* @throws SocketException If the operation fails.
* @throws NullPointerException if the socket is not currently open
*/
public int getSoLinger() throws SocketException
{
return _socket_.getSoLinger();
}
/**
* Returns the port number of the open socket on the local host used
* for the connection.
* Delegates to {@link Socket#getLocalPort()}
* <p>
* @return The port number of the open socket on the local host used
* for the connection.
* @throws NullPointerException if the socket is not currently open
*/
public int getLocalPort()
{
return _socket_.getLocalPort();
}
/**
* Returns the local address to which the client's socket is bound.
* Delegates to {@link Socket#getLocalAddress()}
* <p>
* @return The local address to which the client's socket is bound.
* @throws NullPointerException if the socket is not currently open
*/
public InetAddress getLocalAddress()
{
return _socket_.getLocalAddress();
}
/**
* Returns the port number of the remote host to which the client is
* connected.
* Delegates to {@link Socket#getPort()}
* <p>
* @return The port number of the remote host to which the client is
* connected.
* @throws NullPointerException if the socket is not currently open
*/
public int getRemotePort()
{
return _socket_.getPort();
}
/**
* @return The remote address to which the client is connected.
* Delegates to {@link Socket#getInetAddress()}
* @throws NullPointerException if the socket is not currently open
*/
public InetAddress getRemoteAddress()
{
return _socket_.getInetAddress();
}
/**
* Verifies that the remote end of the given socket is connected to the
* the same host that the SocketClient is currently connected to. This
* is useful for doing a quick security check when a client needs to
* accept a connection from a server, such as an FTP data connection or
* a BSD R command standard error stream.
* <p>
* @param socket the item to check against
* @return True if the remote hosts are the same, false if not.
*/
public boolean verifyRemote(final Socket socket)
{
final InetAddress host1;
final InetAddress host2;
host1 = socket.getInetAddress();
host2 = getRemoteAddress();
return host1.equals(host2);
}
/**
* Sets the SocketFactory used by the SocketClient to open socket
* connections. If the factory value is null, then a default
* factory is used (only do this to reset the factory after having
* previously altered it).
* Any proxy setting is discarded.
* <p>
* @param factory The new SocketFactory the SocketClient should use.
*/
public void setSocketFactory(final SocketFactory factory)
{
if (factory == null) {
_socketFactory_ = DEFAULT_SOCKET_FACTORY;
} else {
_socketFactory_ = factory;
}
// re-setting the socket factory makes the proxy setting useless,
// so set the field to null so that getProxy() doesn't return a
// Proxy that we're actually not using.
connProxy = null;
}
/**
* Sets the ServerSocketFactory used by the SocketClient to open ServerSocket
* connections. If the factory value is null, then a default
* factory is used (only do this to reset the factory after having
* previously altered it).
* <p>
* @param factory The new ServerSocketFactory the SocketClient should use.
* @since 2.0
*/
public void setServerSocketFactory(final ServerSocketFactory factory) {
if (factory == null) {
_serverSocketFactory_ = DEFAULT_SERVER_SOCKET_FACTORY;
} else {
_serverSocketFactory_ = factory;
}
}
/**
* Sets the connection timeout in milliseconds, which will be passed to the {@link Socket} object's
* connect() method.
* @param connectTimeout The connection timeout to use (in ms)
* @since 2.0
*/
public void setConnectTimeout(final int connectTimeout) {
this.connectTimeout = connectTimeout;
}
/**
* Get the underlying socket connection timeout.
* @return timeout (in ms)
* @since 2.0
*/
public int getConnectTimeout() {
return connectTimeout;
}
/**
* Get the underlying {@link ServerSocketFactory}
* @return The server socket factory
* @since 2.2
*/
public ServerSocketFactory getServerSocketFactory() {
return _serverSocketFactory_;
}
/**
* Adds a ProtocolCommandListener.
*
* @param listener The ProtocolCommandListener to add.
* @since 3.0
*/
public void addProtocolCommandListener(final ProtocolCommandListener listener) {
getCommandSupport().addProtocolCommandListener(listener);
}
/**
* Removes a ProtocolCommandListener.
*
* @param listener The ProtocolCommandListener to remove.
* @since 3.0
*/
public void removeProtocolCommandListener(final ProtocolCommandListener listener) {
getCommandSupport().removeProtocolCommandListener(listener);
}
/**
* If there are any listeners, send them the reply details.
*
* @param replyCode the code extracted from the reply
* @param reply the full reply text
* @since 3.0
*/
protected void fireReplyReceived(final int replyCode, final String reply) {
if (getCommandSupport().getListenerCount() > 0) {
getCommandSupport().fireReplyReceived(replyCode, reply);
}
}
/**
* If there are any listeners, send them the command details.
*
* @param command the command name
* @param message the complete message, including command name
* @since 3.0
*/
protected void fireCommandSent(final String command, final String message) {
if (getCommandSupport().getListenerCount() > 0) {
getCommandSupport().fireCommandSent(command, message);
}
}
/**
* Create the CommandSupport instance if required
*/
protected void createCommandSupport(){
commandSupport = new ProtocolCommandSupport(this);
}
/**
* Subclasses can override this if they need to provide their own
* instance field for backwards compatibilty.
*
* @return the CommandSupport instance, may be {@code null}
* @since 3.0
*/
protected ProtocolCommandSupport getCommandSupport() {
return commandSupport;
}
/**
* Sets the proxy for use with all the connections.
* The proxy is used for connections established after the
* call to this method.
*
* @param proxy the new proxy for connections.
* @since 3.2
*/
public void setProxy(final Proxy proxy) {
setSocketFactory(new DefaultSocketFactory(proxy));
connProxy = proxy;
}
/**
* Gets the proxy for use with all the connections.
* @return the current proxy for connections.
*/
public Proxy getProxy() {
return connProxy;
}
/**
* Gets the charset name.
*
* @return the charset.
* @since 3.3
* @deprecated Since the code now requires Java 1.6 as a mininmum
*/
@Deprecated
public String getCharsetName() {
return charset.name();
}
/**
* Gets the charset.
*
* @return the charset.
* @since 3.3
*/
public Charset getCharset() {
return charset;
}
/**
* Sets the charset.
*
* @param charset the charset.
* @since 3.3
*/
public void setCharset(final Charset charset) {
this.charset = charset;
}
/*
* N.B. Fields cannot be pulled up into a super-class without breaking binary compatibility,
* so the abstract method is needed to pass the instance to the methods which were moved here.
*/
}
⏎ org/apache/commons/net/SocketClient.java
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