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	/*
	* Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package sun.net.ftp.impl;

	import java.net.*;
	import java.io.*;
	import java.security.AccessController;
	import java.security.PrivilegedAction;
	import java.text.DateFormat;
	import java.text.ParseException;
	import java.text.SimpleDateFormat;
	import java.util.ArrayList;
	import java.util.Base64;
	import java.util.Calendar;
	import java.util.Date;
	import java.util.Iterator;
	import java.util.List;
	import java.util.TimeZone;
	import java.util.Vector;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;
	import javax.net.ssl.SSLSocket;
	import javax.net.ssl.SSLSocketFactory;
	import sun.net.ftp.*;
	import sun.util.logging.PlatformLogger;


	public class FtpClient extends sun.net.ftp.FtpClient {

	private static int defaultSoTimeout;
	private static int defaultConnectTimeout;
	private static final PlatformLogger logger =
	PlatformLogger.getLogger("sun.net.ftp.FtpClient");
	private Proxy proxy;
	private Socket server;
	private PrintStream out;
	private InputStream in;
	private int readTimeout = -1;
	private int connectTimeout = -1;

	/* Name of encoding to use for output */
	private static String encoding = "ISO8859_1";
	/** remember the ftp server name because we may need it */
	private InetSocketAddress serverAddr;
	private boolean replyPending = false;
	private boolean loggedIn = false;
	private boolean useCrypto = false;
	private SSLSocketFactory sslFact;
	private Socket oldSocket;
	/** Array of strings (usually 1 entry) for the last reply from the server. */
	private Vector<String> serverResponse = new Vector<String>(1);
	/** The last reply code from the ftp daemon. */
	private FtpReplyCode lastReplyCode = null;
	/** Welcome message from the server, if any. */
	private String welcomeMsg;
	/**
	* Only passive mode used in JDK. See Bug 8010784.
	*/
	private final boolean passiveMode = true;
	private TransferType type = TransferType.BINARY;
	private long restartOffset = 0;
	private long lastTransSize = -1; // -1 means 'unknown size'
	private String lastFileName;
	/**
	* Static members used by the parser
	*/
	private static String[] patStrings = {
	// drwxr-xr-x 1 user01 ftp 512 Jan 29 23:32 prog
	"([\\-ld](?:[r\\-][w\\-][x\\-]){3})\\s\\d+ (\\w+)\\s(\\w+)\\s(\\d+)\\s([A-Z][a-z][a-z]\\s\\d+)\\s(\\d\\d:\\d\\d)\\s(\\p{Print})",
	// drwxr-xr-x 1 user01 ftp 512 Jan 29 1997 prog
	"([\\-ld](?:[r\\-][w\\-][x\\-]){3})\\s\\d+ (\\w+)\\s(\\w+)\\s(\\d+)\\s([A-Z][a-z][a-z]\\s\\d+)\\s(\\d{4})\\s(\\p{Print})",
	// 04/28/2006 09:12a 3,563 genBuffer.sh
	"(\\d{2}/\\d{2}/\\d{4})\\s(\\d{2}:\\d{2}[ap])\\s((?:[0-9,]+)\|(?:<DIR>))\\s(\\p{Graph})",
	// 01-29-97 11:32PM <DIR> prog
	"(\\d{2}-\\d{2}-\\d{2})\\s(\\d{2}:\\d{2}[AP]M)\\s((?:[0-9,]+)\|(?:<DIR>))\\s(\\p{Graph})"
	};
	private static int[][] patternGroups = {
	// 0 - file, 1 - size, 2 - date, 3 - time, 4 - year, 5 - permissions,
	// 6 - user, 7 - group
	{7, 4, 5, 6, 0, 1, 2, 3},
	{7, 4, 5, 0, 6, 1, 2, 3},
	{4, 3, 1, 2, 0, 0, 0, 0},
	{4, 3, 1, 2, 0, 0, 0, 0}};
	private static Pattern[] patterns;
	private static Pattern linkp = Pattern.compile("(\\p{Print}+) \\-\\> (\\p{Print}+)$");
	private DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM, java.util.Locale.US);

	static {
	final int vals[] = {0, 0};
	final String encs[] = {null};

	AccessController.doPrivileged(
	new PrivilegedAction<Object>() {

	public Object run() {
	vals[0] = Integer.getInteger("sun.net.client.defaultReadTimeout", 300_000).intValue();
	vals[1] = Integer.getInteger("sun.net.client.defaultConnectTimeout", 300_000).intValue();
	encs[0] = System.getProperty("file.encoding", "ISO8859_1");
	return null;
	}
	});
	if (vals[0] == 0) {
	defaultSoTimeout = -1;
	} else {
	defaultSoTimeout = vals[0];
	}

	if (vals[1] == 0) {
	defaultConnectTimeout = -1;
	} else {
	defaultConnectTimeout = vals[1];
	}

	encoding = encs[0];
	try {
	if (!isASCIISuperset(encoding)) {
	encoding = "ISO8859_1";
	}
	} catch (Exception e) {
	encoding = "ISO8859_1";
	}

	patterns = new Pattern[patStrings.length];
	for (int i = 0; i < patStrings.length; i++) {
	patterns[i] = Pattern.compile(patStrings[i]);
	}
	}

	/**
	* Test the named character encoding to verify that it converts ASCII
	* characters correctly. We have to use an ASCII based encoding, or else
	* the NetworkClients will not work correctly in EBCDIC based systems.
	* However, we cannot just use ASCII or ISO8859_1 universally, because in
	* Asian locales, non-ASCII characters may be embedded in otherwise
	* ASCII based protocols (eg. HTTP). The specifications (RFC2616, 2398)
	* are a little ambiguous in this matter. For instance, RFC2398 [part 2.1]
	* says that the HTTP request URI should be escaped using a defined
	* mechanism, but there is no way to specify in the escaped string what
	* the original character set is. It is not correct to assume that
	* UTF-8 is always used (as in URLs in HTML 4.0). For this reason,
	* until the specifications are updated to deal with this issue more
	* comprehensively, and more importantly, HTTP servers are known to
	* support these mechanisms, we will maintain the current behavior
	* where it is possible to send non-ASCII characters in their original
	* unescaped form.
	*/
	private static boolean isASCIISuperset(String encoding) throws Exception {
	String chkS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
	"abcdefghijklmnopqrstuvwxyz-_.!~*'();/?:@&=+$,";

	// Expected byte sequence for string above
	byte[] chkB = {48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70, 71, 72,
	73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99,
	100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114,
	115, 116, 117, 118, 119, 120, 121, 122, 45, 95, 46, 33, 126, 42, 39, 40, 41, 59,
	47, 63, 58, 64, 38, 61, 43, 36, 44};

	byte[] b = chkS.getBytes(encoding);
	return java.util.Arrays.equals(b, chkB);
	}

	private class DefaultParser implements FtpDirParser {

	/**
	* Possible patterns:
	*
	* drwxr-xr-x 1 user01 ftp 512 Jan 29 23:32 prog
	* drwxr-xr-x 1 user01 ftp 512 Jan 29 1997 prog
	* drwxr-xr-x 1 1 1 512 Jan 29 23:32 prog
	* lrwxr-xr-x 1 user01 ftp 512 Jan 29 23:32 prog -> prog2000
	* drwxr-xr-x 1 username ftp 512 Jan 29 23:32 prog
	* -rw-r--r-- 1 jcc staff 105009 Feb 3 15:05 test.1
	*
	* 01-29-97 11:32PM <DIR> prog
	* 04/28/2006 09:12a 3,563 genBuffer.sh
	*
	* drwxr-xr-x folder 0 Jan 29 23:32 prog
	*
	* 0 DIR 01-29-97 23:32 PROG
	*/
	private DefaultParser() {
	}

	public FtpDirEntry parseLine(String line) {
	String fdate = null;
	String fsize = null;
	String time = null;
	String filename = null;
	String permstring = null;
	String username = null;
	String groupname = null;
	boolean dir = false;
	Calendar now = Calendar.getInstance();
	int year = now.get(Calendar.YEAR);

	Matcher m = null;
	for (int j = 0; j < patterns.length; j++) {
	m = patterns[j].matcher(line);
	if (m.find()) {
	// 0 - file, 1 - size, 2 - date, 3 - time, 4 - year,
	// 5 - permissions, 6 - user, 7 - group
	filename = m.group(patternGroups[j][0]);
	fsize = m.group(patternGroups[j][1]);
	fdate = m.group(patternGroups[j][2]);
	if (patternGroups[j][4] > 0) {
	fdate += (", " + m.group(patternGroups[j][4]));
	} else if (patternGroups[j][3] > 0) {
	fdate += (", " + String.valueOf(year));
	}
	if (patternGroups[j][3] > 0) {
	time = m.group(patternGroups[j][3]);
	}
	if (patternGroups[j][5] > 0) {
	permstring = m.group(patternGroups[j][5]);
	dir = permstring.startsWith("d");
	}
	if (patternGroups[j][6] > 0) {
	username = m.group(patternGroups[j][6]);
	}
	if (patternGroups[j][7] > 0) {
	groupname = m.group(patternGroups[j][7]);
	}
	// Old DOS format
	if ("<DIR>".equals(fsize)) {
	dir = true;
	fsize = null;
	}
	}
	}

	if (filename != null) {
	Date d;
	try {
	d = df.parse(fdate);
	} catch (Exception e) {
	d = null;
	}
	if (d != null && time != null) {
	int c = time.indexOf(':');
	now.setTime(d);
	now.set(Calendar.HOUR, Integer.parseInt(time, 0, c, 10));
	now.set(Calendar.MINUTE, Integer.parseInt(time, c + 1, time.length(), 10));
	d = now.getTime();
	}
	// see if it's a symbolic link, i.e. the name if followed
	// by a -> and a path
	Matcher m2 = linkp.matcher(filename);
	if (m2.find()) {
	// Keep only the name then
	filename = m2.group(1);
	}
	boolean[][] perms = new boolean[3][3];
	for (int i = 0; i < 3; i++) {
	for (int j = 0; j < 3; j++) {
	perms[i][j] = (permstring.charAt((i * 3) + j) != '-');
	}
	}
	FtpDirEntry file = new FtpDirEntry(filename);
	file.setUser(username).setGroup(groupname);
	file.setSize(Long.parseLong(fsize)).setLastModified(d);
	file.setPermissions(perms);
	file.setType(dir ? FtpDirEntry.Type.DIR : (line.charAt(0) == 'l' ? FtpDirEntry.Type.LINK : FtpDirEntry.Type.FILE));
	return file;
	}
	return null;
	}
	}

	private class MLSxParser implements FtpDirParser {

	private SimpleDateFormat df = new SimpleDateFormat("yyyyMMddhhmmss");

	public FtpDirEntry parseLine(String line) {
	String name = null;
	int i = line.lastIndexOf(';');
	if (i > 0) {
	name = line.substring(i + 1).trim();
	line = line.substring(0, i);
	} else {
	name = line.trim();
	line = "";
	}
	FtpDirEntry file = new FtpDirEntry(name);
	while (!line.isEmpty()) {
	String s;
	i = line.indexOf(';');
	if (i > 0) {
	s = line.substring(0, i);
	line = line.substring(i + 1);
	} else {
	s = line;
	line = "";
	}
	i = s.indexOf('=');
	if (i > 0) {
	String fact = s.substring(0, i);
	String value = s.substring(i + 1);
	file.addFact(fact, value);
	}
	}
	String s = file.getFact("Size");
	if (s != null) {
	file.setSize(Long.parseLong(s));
	}
	s = file.getFact("Modify");
	if (s != null) {
	Date d = null;
	try {
	d = df.parse(s);
	} catch (ParseException ex) {
	}
	if (d != null) {
	file.setLastModified(d);
	}
	}
	s = file.getFact("Create");
	if (s != null) {
	Date d = null;
	try {
	d = df.parse(s);
	} catch (ParseException ex) {
	}
	if (d != null) {
	file.setCreated(d);
	}
	}
	s = file.getFact("Type");
	if (s != null) {
	if (s.equalsIgnoreCase("file")) {
	file.setType(FtpDirEntry.Type.FILE);
	}
	if (s.equalsIgnoreCase("dir")) {
	file.setType(FtpDirEntry.Type.DIR);
	}
	if (s.equalsIgnoreCase("cdir")) {
	file.setType(FtpDirEntry.Type.CDIR);
	}
	if (s.equalsIgnoreCase("pdir")) {
	file.setType(FtpDirEntry.Type.PDIR);
	}
	}
	return file;
	}
	};
	private FtpDirParser parser = new DefaultParser();
	private FtpDirParser mlsxParser = new MLSxParser();
	private static Pattern transPat = null;

	private void getTransferSize() {
	lastTransSize = -1;
	/**
	* If it's a start of data transfer response, let's try to extract
	* the size from the response string. Usually it looks like that:
	*
	* 150 Opening BINARY mode data connection for foo (6701 bytes).
	*/
	String response = getLastResponseString();
	if (transPat == null) {
	transPat = Pattern.compile("150 Opening .*\$(\\d+) bytes\$.");
	}
	Matcher m = transPat.matcher(response);
	if (m.find()) {
	String s = m.group(1);
	lastTransSize = Long.parseLong(s);
	}
	}

	/**
	* extract the created file name from the response string:
	* 226 Transfer complete (unique file name:toto.txt.1).
	* Usually happens when a STOU (store unique) command had been issued.
	*/
	private void getTransferName() {
	lastFileName = null;
	String response = getLastResponseString();
	int i = response.indexOf("unique file name:");
	int e = response.lastIndexOf(')');
	if (i >= 0) {
	i += 17; // Length of "unique file name:"
	lastFileName = response.substring(i, e);
	}
	}

	/**
	* Pulls the response from the server and returns the code as a
	* number. Returns -1 on failure.
	*/
	private int readServerResponse() throws IOException {
	StringBuilder replyBuf = new StringBuilder(32);
	int c;
	int continuingCode = -1;
	int code;
	String response;

	serverResponse.setSize(0);
	while (true) {
	while ((c = in.read()) != -1) {
	if (c == '\r') {
	if ((c = in.read()) != '\n') {
	replyBuf.append('\r');
	}
	}
	replyBuf.append((char) c);
	if (c == '\n') {
	break;
	}
	}
	response = replyBuf.toString();
	replyBuf.setLength(0);
	if (logger.isLoggable(PlatformLogger.Level.FINEST)) {
	logger.finest("Server [" + serverAddr + "] --> " + response);
	}

	if (response.length() == 0) {
	code = -1;
	} else {
	try {
	code = Integer.parseInt(response, 0, 3, 10);
	} catch (NumberFormatException e) {
	code = -1;
	} catch (IndexOutOfBoundsException e) {
	/* this line doesn't contain a response code, so
	we just completely ignore it */
	continue;
	}
	}
	serverResponse.addElement(response);
	if (continuingCode != -1) {
	/* we've seen a ###- sequence */
	if (code != continuingCode \|\|
	(response.length() >= 4 && response.charAt(3) == '-')) {
	continue;
	} else {
	/* seen the end of code sequence */
	continuingCode = -1;
	break;
	}
	} else if (response.length() >= 4 && response.charAt(3) == '-') {
	continuingCode = code;
	continue;
	} else {
	break;
	}
	}

	return code;
	}

	/** Sends command <i>cmd</i> to the server. */
	private void sendServer(String cmd) {
	out.print(cmd);
	if (logger.isLoggable(PlatformLogger.Level.FINEST)) {
	logger.finest("Server [" + serverAddr + "] <-- " + cmd);
	}
	}

	/** converts the server response into a string. */
	private String getResponseString() {
	return serverResponse.elementAt(0);
	}

	/** Returns all server response strings. */
	private Vector<String> getResponseStrings() {
	return serverResponse;
	}

	/**
	* Read the reply from the FTP server.
	*
	* @return <code>true</code> if the command was successful
	* @throws IOException if an error occurred
	*/
	private boolean readReply() throws IOException {
	lastReplyCode = FtpReplyCode.find(readServerResponse());

	if (lastReplyCode.isPositivePreliminary()) {
	replyPending = true;
	return true;
	}
	if (lastReplyCode.isPositiveCompletion() \|\| lastReplyCode.isPositiveIntermediate()) {
	if (lastReplyCode == FtpReplyCode.CLOSING_DATA_CONNECTION) {
	getTransferName();
	}
	return true;
	}
	return false;
	}

	/**
	* Sends a command to the FTP server and returns the error code
	* (which can be a "success") sent by the server.
	*
	* @param cmd
	* @return <code>true</code> if the command was successful
	* @throws IOException
	*/
	private boolean issueCommand(String cmd) throws IOException,
	sun.net.ftp.FtpProtocolException {
	if (!isConnected()) {
	throw new IllegalStateException("Not connected");
	}
	if (replyPending) {
	try {
	completePending();
	} catch (sun.net.ftp.FtpProtocolException e) {
	// ignore...
	}
	}
	if (cmd.indexOf('\n') != -1) {
	sun.net.ftp.FtpProtocolException ex
	= new sun.net.ftp.FtpProtocolException("Illegal FTP command");
	ex.initCause(new IllegalArgumentException("Illegal carriage return"));
	throw ex;
	}
	sendServer(cmd + "\r\n");
	return readReply();
	}

	/**
	* Send a command to the FTP server and check for success.
	*
	* @param cmd String containing the command
	*
	* @throws FtpProtocolException if an error occurred
	*/
	private void issueCommandCheck(String cmd) throws sun.net.ftp.FtpProtocolException, IOException {
	if (!issueCommand(cmd)) {
	throw new sun.net.ftp.FtpProtocolException(cmd + ":" + getResponseString(), getLastReplyCode());
	}
	}
	private static Pattern epsvPat = null;
	private static Pattern pasvPat = null;

	/**
	* Opens a "PASSIVE" connection with the server and returns the connected
	* <code>Socket</code>.
	*
	* @return the connected <code>Socket</code>
	* @throws IOException if the connection was unsuccessful.
	*/
	private Socket openPassiveDataConnection(String cmd) throws sun.net.ftp.FtpProtocolException, IOException {
	String serverAnswer;
	int port;
	InetSocketAddress dest = null;

	/**
	* Here is the idea:
	*
	* - First we want to try the new (and IPv6 compatible) EPSV command
	* But since we want to be nice with NAT software, we'll issue the
	* EPSV ALL command first.
	* EPSV is documented in RFC2428
	* - If EPSV fails, then we fall back to the older, yet ok, PASV
	* - If PASV fails as well, then we throw an exception and the calling
	* method will have to try the EPRT or PORT command
	*/
	if (issueCommand("EPSV ALL")) {
	// We can safely use EPSV commands
	issueCommandCheck("EPSV");
	serverAnswer = getResponseString();

	// The response string from a EPSV command will contain the port number
	// the format will be :
	// 229 Entering Extended PASSIVE Mode (\|\|\|58210\|)
	//
	// So we'll use the regular expresions package to parse the output.

	if (epsvPat == null) {
	epsvPat = Pattern.compile("^229 .* \$\\\|\\\|\\\|(\\d+)\\\|\$");
	}
	Matcher m = epsvPat.matcher(serverAnswer);
	if (!m.find()) {
	throw new sun.net.ftp.FtpProtocolException("EPSV failed : " + serverAnswer);
	}
	// Yay! Let's extract the port number
	String s = m.group(1);
	port = Integer.parseInt(s);
	InetAddress add = server.getInetAddress();
	if (add != null) {
	dest = new InetSocketAddress(add, port);
	} else {
	// This means we used an Unresolved address to connect in
	// the first place. Most likely because the proxy is doing
	// the name resolution for us, so let's keep using unresolved
	// address.
	dest = InetSocketAddress.createUnresolved(serverAddr.getHostName(), port);
	}
	} else {
	// EPSV ALL failed, so Let's try the regular PASV cmd
	issueCommandCheck("PASV");
	serverAnswer = getResponseString();

	// Let's parse the response String to get the IP & port to connect
	// to. The String should be in the following format :
	//
	// 227 Entering PASSIVE Mode (A1,A2,A3,A4,p1,p2)
	//
	// Note that the two parenthesis are optional
	//
	// The IP address is A1.A2.A3.A4 and the port is p1 * 256 + p2
	//
	// The regular expression is a bit more complex this time, because
	// the parenthesis are optionals and we have to use 3 groups.

	if (pasvPat == null) {
	pasvPat = Pattern.compile("227 .* \$?(\\d{1,3},\\d{1,3},\\d{1,3},\\d{1,3}),(\\d{1,3}),(\\d{1,3})\$?");
	}
	Matcher m = pasvPat.matcher(serverAnswer);
	if (!m.find()) {
	throw new sun.net.ftp.FtpProtocolException("PASV failed : " + serverAnswer);
	}
	// Get port number out of group 2 & 3
	port = Integer.parseInt(m.group(3)) + (Integer.parseInt(m.group(2)) << 8);
	// IP address is simple
	String s = m.group(1).replace(',', '.');
	dest = new InetSocketAddress(s, port);
	}
	// Got everything, let's open the socket!
	Socket s;
	if (proxy != null) {
	if (proxy.type() == Proxy.Type.SOCKS) {
	s = AccessController.doPrivileged(
	new PrivilegedAction<Socket>() {

	public Socket run() {
	return new Socket(proxy);
	}
	});
	} else {
	s = new Socket(Proxy.NO_PROXY);
	}
	} else {
	s = new Socket();
	}

	InetAddress serverAddress = AccessController.doPrivileged(
	new PrivilegedAction<InetAddress>() {
	@Override
	public InetAddress run() {
	return server.getLocalAddress();
	}
	});

	// Bind the socket to the same address as the control channel. This
	// is needed in case of multi-homed systems.
	s.bind(new InetSocketAddress(serverAddress, 0));
	if (connectTimeout >= 0) {
	s.connect(dest, connectTimeout);
	} else {
	if (defaultConnectTimeout > 0) {
	s.connect(dest, defaultConnectTimeout);
	} else {
	s.connect(dest);
	}
	}
	if (readTimeout >= 0) {
	s.setSoTimeout(readTimeout);
	} else if (defaultSoTimeout > 0) {
	s.setSoTimeout(defaultSoTimeout);
	}
	if (useCrypto) {
	try {
	s = sslFact.createSocket(s, dest.getHostName(), dest.getPort(), true);
	} catch (Exception e) {
	throw new sun.net.ftp.FtpProtocolException("Can't open secure data channel: " + e);
	}
	}
	if (!issueCommand(cmd)) {
	s.close();
	if (getLastReplyCode() == FtpReplyCode.FILE_UNAVAILABLE) {
	// Ensure backward compatibility
	throw new FileNotFoundException(cmd);
	}
	throw new sun.net.ftp.FtpProtocolException(cmd + ":" + getResponseString(), getLastReplyCode());
	}
	return s;
	}

	/**
	* Opens a data connection with the server according to the set mode
	* (ACTIVE or PASSIVE) then send the command passed as an argument.
	*
	* @param cmd the <code>String</code> containing the command to execute
	* @return the connected <code>Socket</code>
	* @throws IOException if the connection or command failed
	*/
	private Socket openDataConnection(String cmd) throws sun.net.ftp.FtpProtocolException, IOException {
	Socket clientSocket;

	if (passiveMode) {
	try {
	return openPassiveDataConnection(cmd);
	} catch (sun.net.ftp.FtpProtocolException e) {
	// If Passive mode failed, fall back on PORT
	// Otherwise throw exception
	String errmsg = e.getMessage();
	if (!errmsg.startsWith("PASV") && !errmsg.startsWith("EPSV")) {
	throw e;
	}
	}
	}
	ServerSocket portSocket;
	InetAddress myAddress;
	String portCmd;

	if (proxy != null && proxy.type() == Proxy.Type.SOCKS) {
	// We're behind a firewall and the passive mode fail,
	// since we can't accept a connection through SOCKS (yet)
	// throw an exception
	throw new sun.net.ftp.FtpProtocolException("Passive mode failed");
	}
	// Bind the ServerSocket to the same address as the control channel
	// This is needed for multi-homed systems
	portSocket = new ServerSocket(0, 1, server.getLocalAddress());
	try {
	myAddress = portSocket.getInetAddress();
	if (myAddress.isAnyLocalAddress()) {
	myAddress = server.getLocalAddress();
	}
	// Let's try the new, IPv6 compatible EPRT command
	// See RFC2428 for specifics
	// Some FTP servers (like the one on Solaris) are bugged, they
	// will accept the EPRT command but then, the subsequent command
	// (e.g. RETR) will fail, so we have to check BOTH results (the
	// EPRT cmd then the actual command) to decide whether we should
	// fall back on the older PORT command.
	portCmd = "EPRT \|" + ((myAddress instanceof Inet6Address) ? "2" : "1") + "\|" +
	myAddress.getHostAddress() + "\|" + portSocket.getLocalPort() + "\|";
	if (!issueCommand(portCmd) \|\| !issueCommand(cmd)) {
	// The EPRT command failed, let's fall back to good old PORT
	portCmd = "PORT ";
	byte[] addr = myAddress.getAddress();

	/* append host addr */
	for (int i = 0; i < addr.length; i++) {
	portCmd = portCmd + (addr[i] & 0xFF) + ",";
	}

	/* append port number */
	portCmd = portCmd + ((portSocket.getLocalPort() >>> 8) & 0xff) + "," + (portSocket.getLocalPort() & 0xff);
	issueCommandCheck(portCmd);
	issueCommandCheck(cmd);
	}
	// Either the EPRT or the PORT command was successful
	// Let's create the client socket
	if (connectTimeout >= 0) {
	portSocket.setSoTimeout(connectTimeout);
	} else {
	if (defaultConnectTimeout > 0) {
	portSocket.setSoTimeout(defaultConnectTimeout);
	}
	}
	clientSocket = portSocket.accept();
	if (readTimeout >= 0) {
	clientSocket.setSoTimeout(readTimeout);
	} else {
	if (defaultSoTimeout > 0) {
	clientSocket.setSoTimeout(defaultSoTimeout);
	}
	}
	} finally {
	portSocket.close();
	}
	if (useCrypto) {
	try {
	clientSocket = sslFact.createSocket(clientSocket, serverAddr.getHostName(), serverAddr.getPort(), true);
	} catch (Exception ex) {
	throw new IOException(ex.getLocalizedMessage());
	}
	}
	return clientSocket;
	}

	private InputStream createInputStream(InputStream in) {
	if (type == TransferType.ASCII) {
	return new sun.net.TelnetInputStream(in, false);
	}
	return in;
	}

	private OutputStream createOutputStream(OutputStream out) {
	if (type == TransferType.ASCII) {
	return new sun.net.TelnetOutputStream(out, false);
	}
	return out;
	}

	/**
	* Creates an instance of FtpClient. The client is not connected to any
	* server yet.
	*
	*/
	protected FtpClient() {
	}

	/**
	* Creates an instance of FtpClient. The client is not connected to any
	* server yet.
	*
	*/
	public static sun.net.ftp.FtpClient create() {
	return new FtpClient();
	}

	/**
	* Set the transfer mode to <I>passive</I>. In that mode, data connections
	* are established by having the client connect to the server.
	* This is the recommended default mode as it will work best through
	* firewalls and NATs.
	*
	* @return This FtpClient
	* @see #setActiveMode()
	*/
	public sun.net.ftp.FtpClient enablePassiveMode(boolean passive) {

	// Only passive mode used in JDK. See Bug 8010784.
	// passiveMode = passive;
	return this;
	}

	/**
	* Gets the current transfer mode.
	*
	* @return the current <code>FtpTransferMode</code>
	*/
	public boolean isPassiveModeEnabled() {
	return passiveMode;
	}

	/**
	* Sets the timeout value to use when connecting to the server,
	*
	* @param timeout the timeout value, in milliseconds, to use for the connect
	* operation. A value of zero or less, means use the default timeout.
	*
	* @return This FtpClient
	*/
	public sun.net.ftp.FtpClient setConnectTimeout(int timeout) {
	connectTimeout = timeout;
	return this;
	}

	/**
	* Returns the current connection timeout value.
	*
	* @return the value, in milliseconds, of the current connect timeout.
	* @see #setConnectTimeout(int)
	*/
	public int getConnectTimeout() {
	return connectTimeout;
	}

	/**
	* Sets the timeout value to use when reading from the server,
	*
	* @param timeout the timeout value, in milliseconds, to use for the read
	* operation. A value of zero or less, means use the default timeout.
	* @return This FtpClient
	*/
	public sun.net.ftp.FtpClient setReadTimeout(int timeout) {
	readTimeout = timeout;
	return this;
	}

	/**
	* Returns the current read timeout value.
	*
	* @return the value, in milliseconds, of the current read timeout.
	* @see #setReadTimeout(int)
	*/
	public int getReadTimeout() {
	return readTimeout;
	}

	public sun.net.ftp.FtpClient setProxy(Proxy p) {
	proxy = p;
	return this;
	}

	/**
	* Get the proxy of this FtpClient
	*
	* @return the <code>Proxy</code>, this client is using, or <code>null</code>
	* if none is used.
	* @see #setProxy(Proxy)
	*/
	public Proxy getProxy() {
	return proxy;
	}

	/**
	* Connects to the specified destination.
	*
	* @param dest the <code>InetSocketAddress</code> to connect to.
	* @throws IOException if the connection fails.
	*/
	private void tryConnect(InetSocketAddress dest, int timeout) throws IOException {
	if (isConnected()) {
	disconnect();
	}
	server = doConnect(dest, timeout);
	try {
	out = new PrintStream(new BufferedOutputStream(server.getOutputStream()),
	true, encoding);
	} catch (UnsupportedEncodingException e) {
	throw new InternalError(encoding + "encoding not found", e);
	}
	in = new BufferedInputStream(server.getInputStream());
	}

	private Socket doConnect(InetSocketAddress dest, int timeout) throws IOException {
	Socket s;
	if (proxy != null) {
	if (proxy.type() == Proxy.Type.SOCKS) {
	s = AccessController.doPrivileged(
	new PrivilegedAction<Socket>() {

	public Socket run() {
	return new Socket(proxy);
	}
	});
	} else {
	s = new Socket(Proxy.NO_PROXY);
	}
	} else {
	s = new Socket();
	}
	// Instance specific timeouts do have priority, that means
	// connectTimeout & readTimeout (-1 means not set)
	// Then global default timeouts
	// Then no timeout.
	if (timeout >= 0) {
	s.connect(dest, timeout);
	} else {
	if (connectTimeout >= 0) {
	s.connect(dest, connectTimeout);
	} else {
	if (defaultConnectTimeout > 0) {
	s.connect(dest, defaultConnectTimeout);
	} else {
	s.connect(dest);
	}
	}
	}
	if (readTimeout >= 0) {
	s.setSoTimeout(readTimeout);
	} else if (defaultSoTimeout > 0) {
	s.setSoTimeout(defaultSoTimeout);
	}
	return s;
	}

	private void disconnect() throws IOException {
	if (isConnected()) {
	server.close();
	}
	server = null;
	in = null;
	out = null;
	lastTransSize = -1;
	lastFileName = null;
	restartOffset = 0;
	welcomeMsg = null;
	lastReplyCode = null;
	serverResponse.setSize(0);
	}

	/**
	* Tests whether this client is connected or not to a server.
	*
	* @return <code>true</code> if the client is connected.
	*/
	public boolean isConnected() {
	return server != null;
	}

	public SocketAddress getServerAddress() {
	return server == null ? null : server.getRemoteSocketAddress();
	}

	public sun.net.ftp.FtpClient connect(SocketAddress dest) throws sun.net.ftp.FtpProtocolException, IOException {
	return connect(dest, -1);
	}

	/**
	* Connects the FtpClient to the specified destination.
	*
	* @param dest the address of the destination server
	* @throws IOException if connection failed.
	*/
	public sun.net.ftp.FtpClient connect(SocketAddress dest, int timeout) throws sun.net.ftp.FtpProtocolException, IOException {
	if (!(dest instanceof InetSocketAddress)) {
	throw new IllegalArgumentException("Wrong address type");
	}
	serverAddr = (InetSocketAddress) dest;
	tryConnect(serverAddr, timeout);
	if (!readReply()) {
	throw new sun.net.ftp.FtpProtocolException("Welcome message: " +
	getResponseString(), lastReplyCode);
	}
	welcomeMsg = getResponseString().substring(4);
	return this;
	}

	private void tryLogin(String user, char[] password) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("USER " + user);

	/*
	* Checks for "331 User name okay, need password." answer
	*/
	if (lastReplyCode == FtpReplyCode.NEED_PASSWORD) {
	if ((password != null) && (password.length > 0)) {
	issueCommandCheck("PASS " + String.valueOf(password));
	}
	}
	}

	/**
	* Attempts to log on the server with the specified user name and password.
	*
	* @param user The user name
	* @param password The password for that user
	* @return <code>true</code> if the login was successful.
	* @throws IOException if an error occurred during the transmission
	*/
	public sun.net.ftp.FtpClient login(String user, char[] password) throws sun.net.ftp.FtpProtocolException, IOException {
	if (!isConnected()) {
	throw new sun.net.ftp.FtpProtocolException("Not connected yet", FtpReplyCode.BAD_SEQUENCE);
	}
	if (user == null \|\| user.length() == 0) {
	throw new IllegalArgumentException("User name can't be null or empty");
	}
	tryLogin(user, password);

	// keep the welcome message around so we can
	// put it in the resulting HTML page.
	String l;
	StringBuilder sb = new StringBuilder();
	for (int i = 0; i < serverResponse.size(); i++) {
	l = serverResponse.elementAt(i);
	if (l != null) {
	if (l.length() >= 4 && l.startsWith("230")) {
	// get rid of the "230-" prefix
	l = l.substring(4);
	}
	sb.append(l);
	}
	}
	welcomeMsg = sb.toString();
	loggedIn = true;
	return this;
	}

	/**
	* Attempts to log on the server with the specified user name, password and
	* account name.
	*
	* @param user The user name
	* @param password The password for that user.
	* @param account The account name for that user.
	* @return <code>true</code> if the login was successful.
	* @throws IOException if an error occurs during the transmission.
	*/
	public sun.net.ftp.FtpClient login(String user, char[] password, String account) throws sun.net.ftp.FtpProtocolException, IOException {

	if (!isConnected()) {
	throw new sun.net.ftp.FtpProtocolException("Not connected yet", FtpReplyCode.BAD_SEQUENCE);
	}
	if (user == null \|\| user.length() == 0) {
	throw new IllegalArgumentException("User name can't be null or empty");
	}
	tryLogin(user, password);

	/*
	* Checks for "332 Need account for login." answer
	*/
	if (lastReplyCode == FtpReplyCode.NEED_ACCOUNT) {
	issueCommandCheck("ACCT " + account);
	}

	// keep the welcome message around so we can
	// put it in the resulting HTML page.
	StringBuilder sb = new StringBuilder();
	if (serverResponse != null) {
	for (String l : serverResponse) {
	if (l != null) {
	if (l.length() >= 4 && l.startsWith("230")) {
	// get rid of the "230-" prefix
	l = l.substring(4);
	}
	sb.append(l);
	}
	}
	}
	welcomeMsg = sb.toString();
	loggedIn = true;
	return this;
	}

	/**
	* Logs out the current user. This is in effect terminates the current
	* session and the connection to the server will be closed.
	*
	*/
	public void close() throws IOException {
	if (isConnected()) {
	try {
	issueCommand("QUIT");
	} catch (FtpProtocolException e) {
	}
	loggedIn = false;
	}
	disconnect();
	}

	/**
	* Checks whether the client is logged in to the server or not.
	*
	* @return <code>true</code> if the client has already completed a login.
	*/
	public boolean isLoggedIn() {
	return loggedIn;
	}

	/**
	* Changes to a specific directory on a remote FTP server
	*
	* @param remoteDirectory path of the directory to CD to.
	* @return <code>true</code> if the operation was successful.
	* @exception <code>FtpProtocolException</code>
	*/
	public sun.net.ftp.FtpClient changeDirectory(String remoteDirectory) throws sun.net.ftp.FtpProtocolException, IOException {
	if (remoteDirectory == null \|\| "".equals(remoteDirectory)) {
	throw new IllegalArgumentException("directory can't be null or empty");
	}

	issueCommandCheck("CWD " + remoteDirectory);
	return this;
	}

	/**
	* Changes to the parent directory, sending the CDUP command to the server.
	*
	* @return <code>true</code> if the command was successful.
	* @throws IOException
	*/
	public sun.net.ftp.FtpClient changeToParentDirectory() throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("CDUP");
	return this;
	}

	/**
	* Returns the server current working directory, or <code>null</code> if
	* the PWD command failed.
	*
	* @return a <code>String</code> containing the current working directory,
	* or <code>null</code>
	* @throws IOException
	*/
	public String getWorkingDirectory() throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("PWD");
	/*
	* answer will be of the following format :
	*
	* 257 "/" is current directory.
	*/
	String answ = getResponseString();
	if (!answ.startsWith("257")) {
	return null;
	}
	return answ.substring(5, answ.lastIndexOf('"'));
	}

	/**
	* Sets the restart offset to the specified value. That value will be
	* sent through a <code>REST</code> command to server before a file
	* transfer and has the effect of resuming a file transfer from the
	* specified point. After a transfer the restart offset is set back to
	* zero.
	*
	* @param offset the offset in the remote file at which to start the next
	* transfer. This must be a value greater than or equal to zero.
	* @throws IllegalArgumentException if the offset is negative.
	*/
	public sun.net.ftp.FtpClient setRestartOffset(long offset) {
	if (offset < 0) {
	throw new IllegalArgumentException("offset can't be negative");
	}
	restartOffset = offset;
	return this;
	}

	/**
	* Retrieves a file from the ftp server and writes it to the specified
	* <code>OutputStream</code>.
	* If the restart offset was set, then a <code>REST</code> command will be
	* sent before the RETR in order to restart the tranfer from the specified
	* offset.
	* The <code>OutputStream</code> is not closed by this method at the end
	* of the transfer.
	*
	* @param name a {@code String} containing the name of the file to
	* retreive from the server.
	* @param local the <code>OutputStream</code> the file should be written to.
	* @throws IOException if the transfer fails.
	*/
	public sun.net.ftp.FtpClient getFile(String name, OutputStream local) throws sun.net.ftp.FtpProtocolException, IOException {
	int mtu = 1500;
	if (restartOffset > 0) {
	Socket s;
	try {
	s = openDataConnection("REST " + restartOffset);
	} finally {
	restartOffset = 0;
	}
	issueCommandCheck("RETR " + name);
	getTransferSize();
	InputStream remote = createInputStream(s.getInputStream());
	byte[] buf = new byte[mtu * 10];
	int l;
	while ((l = remote.read(buf)) >= 0) {
	if (l > 0) {
	local.write(buf, 0, l);
	}
	}
	remote.close();
	} else {
	Socket s = openDataConnection("RETR " + name);
	getTransferSize();
	InputStream remote = createInputStream(s.getInputStream());
	byte[] buf = new byte[mtu * 10];
	int l;
	while ((l = remote.read(buf)) >= 0) {
	if (l > 0) {
	local.write(buf, 0, l);
	}
	}
	remote.close();
	}
	return completePending();
	}

	/**
	* Retrieves a file from the ftp server, using the RETR command, and
	* returns the InputStream from* the established data connection.
	* {@link #completePending()} <b>has</b> to be called once the application
	* is done reading from the returned stream.
	*
	* @param name the name of the remote file
	* @return the {@link java.io.InputStream} from the data connection, or
	* <code>null</code> if the command was unsuccessful.
	* @throws IOException if an error occurred during the transmission.
	*/
	public InputStream getFileStream(String name) throws sun.net.ftp.FtpProtocolException, IOException {
	Socket s;
	if (restartOffset > 0) {
	try {
	s = openDataConnection("REST " + restartOffset);
	} finally {
	restartOffset = 0;
	}
	if (s == null) {
	return null;
	}
	issueCommandCheck("RETR " + name);
	getTransferSize();
	return createInputStream(s.getInputStream());
	}

	s = openDataConnection("RETR " + name);
	if (s == null) {
	return null;
	}
	getTransferSize();
	return createInputStream(s.getInputStream());
	}

	/**
	* Transfers a file from the client to the server (aka a <I>put</I>)
	* by sending the STOR or STOU command, depending on the
	* <code>unique</code> argument, and returns the <code>OutputStream</code>
	* from the established data connection.
	* {@link #completePending()} <b>has</b> to be called once the application
	* is finished writing to the stream.
	*
	* A new file is created at the server site if the file specified does
	* not already exist.
	*
	* If <code>unique</code> is set to <code>true</code>, the resultant file
	* is to be created under a name unique to that directory, meaning
	* it will not overwrite an existing file, instead the server will
	* generate a new, unique, file name.
	* The name of the remote file can be retrieved, after completion of the
	* transfer, by calling {@link #getLastFileName()}.
	*
	* @param name the name of the remote file to write.
	* @param unique <code>true</code> if the remote files should be unique,
	* in which case the STOU command will be used.
	* @return the {@link java.io.OutputStream} from the data connection or
	* <code>null</code> if the command was unsuccessful.
	* @throws IOException if an error occurred during the transmission.
	*/
	public OutputStream putFileStream(String name, boolean unique)
	throws sun.net.ftp.FtpProtocolException, IOException
	{
	String cmd = unique ? "STOU " : "STOR ";
	Socket s = openDataConnection(cmd + name);
	if (s == null) {
	return null;
	}
	boolean bm = (type == TransferType.BINARY);
	return new sun.net.TelnetOutputStream(s.getOutputStream(), bm);
	}

	/**
	* Transfers a file from the client to the server (aka a <I>put</I>)
	* by sending the STOR command. The content of the <code>InputStream</code>
	* passed in argument is written into the remote file, overwriting any
	* existing data.
	*
	* A new file is created at the server site if the file specified does
	* not already exist.
	*
	* @param name the name of the remote file to write.
	* @param local the <code>InputStream</code> that points to the data to
	* transfer.
	* @param unique <code>true</code> if the remote file should be unique
	* (i.e. not already existing), <code>false</code> otherwise.
	* @return <code>true</code> if the transfer was successful.
	* @throws IOException if an error occurred during the transmission.
	* @see #getLastFileName()
	*/
	public sun.net.ftp.FtpClient putFile(String name, InputStream local, boolean unique) throws sun.net.ftp.FtpProtocolException, IOException {
	String cmd = unique ? "STOU " : "STOR ";
	int mtu = 1500;
	if (type == TransferType.BINARY) {
	Socket s = openDataConnection(cmd + name);
	OutputStream remote = createOutputStream(s.getOutputStream());
	byte[] buf = new byte[mtu * 10];
	int l;
	while ((l = local.read(buf)) >= 0) {
	if (l > 0) {
	remote.write(buf, 0, l);
	}
	}
	remote.close();
	}
	return completePending();
	}

	/**
	* Sends the APPE command to the server in order to transfer a data stream
	* passed in argument and append it to the content of the specified remote
	* file.
	*
	* @param name A <code>String</code> containing the name of the remote file
	* to append to.
	* @param local The <code>InputStream</code> providing access to the data
	* to be appended.
	* @return <code>true</code> if the transfer was successful.
	* @throws IOException if an error occurred during the transmission.
	*/
	public sun.net.ftp.FtpClient appendFile(String name, InputStream local) throws sun.net.ftp.FtpProtocolException, IOException {
	int mtu = 1500;
	Socket s = openDataConnection("APPE " + name);
	OutputStream remote = createOutputStream(s.getOutputStream());
	byte[] buf = new byte[mtu * 10];
	int l;
	while ((l = local.read(buf)) >= 0) {
	if (l > 0) {
	remote.write(buf, 0, l);
	}
	}
	remote.close();
	return completePending();
	}

	/**
	* Renames a file on the server.
	*
	* @param from the name of the file being renamed
	* @param to the new name for the file
	* @throws IOException if the command fails
	*/
	public sun.net.ftp.FtpClient rename(String from, String to) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("RNFR " + from);
	issueCommandCheck("RNTO " + to);
	return this;
	}

	/**
	* Deletes a file on the server.
	*
	* @param name a <code>String</code> containing the name of the file
	* to delete.
	* @return <code>true</code> if the command was successful
	* @throws IOException if an error occurred during the exchange
	*/
	public sun.net.ftp.FtpClient deleteFile(String name) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("DELE " + name);
	return this;
	}

	/**
	* Creates a new directory on the server.
	*
	* @param name a <code>String</code> containing the name of the directory
	* to create.
	* @return <code>true</code> if the operation was successful.
	* @throws IOException if an error occurred during the exchange
	*/
	public sun.net.ftp.FtpClient makeDirectory(String name) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("MKD " + name);
	return this;
	}

	/**
	* Removes a directory on the server.
	*
	* @param name a <code>String</code> containing the name of the directory
	* to remove.
	*
	* @return <code>true</code> if the operation was successful.
	* @throws IOException if an error occurred during the exchange.
	*/
	public sun.net.ftp.FtpClient removeDirectory(String name) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("RMD " + name);
	return this;
	}

	/**
	* Sends a No-operation command. It's useful for testing the connection
	* status or as a <I>keep alive</I> mechanism.
	*
	* @throws FtpProtocolException if the command fails
	*/
	public sun.net.ftp.FtpClient noop() throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("NOOP");
	return this;
	}

	/**
	* Sends the STAT command to the server.
	* This can be used while a data connection is open to get a status
	* on the current transfer, in that case the parameter should be
	* <code>null</code>.
	* If used between file transfers, it may have a pathname as argument
	* in which case it will work as the LIST command except no data
	* connection will be created.
	*
	* @param name an optional <code>String</code> containing the pathname
	* the STAT command should apply to.
	* @return the response from the server or <code>null</code> if the
	* command failed.
	* @throws IOException if an error occurred during the transmission.
	*/
	public String getStatus(String name) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck((name == null ? "STAT" : "STAT " + name));
	/*
	* A typical response will be:
	* 213-status of t32.gif:
	* -rw-r--r-- 1 jcc staff 247445 Feb 17 1998 t32.gif
	* 213 End of Status
	*
	* or
	*
	* 211-jsn FTP server status:
	* Version wu-2.6.2+Sun
	* Connected to localhost (::1)
	* Logged in as jccollet
	* TYPE: ASCII, FORM: Nonprint; STRUcture: File; transfer MODE: Stream
	* No data connection
	* 0 data bytes received in 0 files
	* 0 data bytes transmitted in 0 files
	* 0 data bytes total in 0 files
	* 53 traffic bytes received in 0 transfers
	* 485 traffic bytes transmitted in 0 transfers
	* 587 traffic bytes total in 0 transfers
	* 211 End of status
	*
	* So we need to remove the 1st and last line
	*/
	Vector<String> resp = getResponseStrings();
	StringBuilder sb = new StringBuilder();
	for (int i = 1; i < resp.size() - 1; i++) {
	sb.append(resp.get(i));
	}
	return sb.toString();
	}

	/**
	* Sends the FEAT command to the server and returns the list of supported
	* features in the form of strings.
	*
	* The features are the supported commands, like AUTH TLS, PROT or PASV.
	* See the RFCs for a complete list.
	*
	* Note that not all FTP servers support that command, in which case
	* the method will return <code>null</code>
	*
	* @return a <code>List</code> of <code>Strings</code> describing the
	* supported additional features, or <code>null</code>
	* if the command is not supported.
	* @throws IOException if an error occurs during the transmission.
	*/
	public List<String> getFeatures() throws sun.net.ftp.FtpProtocolException, IOException {
	/*
	* The FEAT command, when implemented will return something like:
	*
	* 211-Features:
	* AUTH TLS
	* PBSZ
	* PROT
	* EPSV
	* EPRT
	* PASV
	* REST STREAM
	* 211 END
	*/
	ArrayList<String> features = new ArrayList<String>();
	issueCommandCheck("FEAT");
	Vector<String> resp = getResponseStrings();
	// Note that we start at index 1 to skip the 1st line (211-...)
	// and we stop before the last line.
	for (int i = 1; i < resp.size() - 1; i++) {
	String s = resp.get(i);
	// Get rid of leading space and trailing newline
	features.add(s.substring(1, s.length() - 1));
	}
	return features;
	}

	/**
	* sends the ABOR command to the server.
	* It tells the server to stop the previous command or transfer.
	*
	* @return <code>true</code> if the command was successful.
	* @throws IOException if an error occurred during the transmission.
	*/
	public sun.net.ftp.FtpClient abort() throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("ABOR");
	// TODO: Must check the ReplyCode:
	/*
	* From the RFC:
	* There are two cases for the server upon receipt of this
	* command: (1) the FTP service command was already completed,
	* or (2) the FTP service command is still in progress.
	* In the first case, the server closes the data connection
	* (if it is open) and responds with a 226 reply, indicating
	* that the abort command was successfully processed.
	* In the second case, the server aborts the FTP service in
	* progress and closes the data connection, returning a 426
	* reply to indicate that the service request terminated
	* abnormally. The server then sends a 226 reply,
	* indicating that the abort command was successfully
	* processed.
	*/


	return this;
	}

	/**
	* Some methods do not wait until completion before returning, so this
	* method can be called to wait until completion. This is typically the case
	* with commands that trigger a transfer like {@link #getFileStream(String)}.
	* So this method should be called before accessing information related to
	* such a command.
	* <p>This method will actually block reading on the command channel for a
	* notification from the server that the command is finished. Such a
	* notification often carries extra information concerning the completion
	* of the pending action (e.g. number of bytes transfered).</p>
	* <p>Note that this will return true immediately if no command or action
	* is pending</p>
	* <p>It should be also noted that most methods issuing commands to the ftp
	* server will call this method if a previous command is pending.
	* <p>Example of use:
	* <pre>
	* InputStream in = cl.getFileStream("file");
	* ...
	* cl.completePending();
	* long size = cl.getLastTransferSize();
	* </pre>
	* On the other hand, it's not necessary in a case like:
	* <pre>
	* InputStream in = cl.getFileStream("file");
	* // read content
	* ...
	* cl.logout();
	* </pre>
	* <p>Since {@link #logout()} will call completePending() if necessary.</p>
	* @return <code>true</code> if the completion was successful or if no
	* action was pending.
	* @throws IOException
	*/
	public sun.net.ftp.FtpClient completePending() throws sun.net.ftp.FtpProtocolException, IOException {
	while (replyPending) {
	replyPending = false;
	if (!readReply()) {
	throw new sun.net.ftp.FtpProtocolException(getLastResponseString(), lastReplyCode);
	}
	}
	return this;
	}

	/**
	* Reinitializes the USER parameters on the FTP server
	*
	* @throws FtpProtocolException if the command fails
	*/
	public sun.net.ftp.FtpClient reInit() throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("REIN");
	loggedIn = false;
	if (useCrypto) {
	if (server instanceof SSLSocket) {
	javax.net.ssl.SSLSession session = ((SSLSocket) server).getSession();
	session.invalidate();
	// Restore previous socket and streams
	server = oldSocket;
	oldSocket = null;
	try {
	out = new PrintStream(new BufferedOutputStream(server.getOutputStream()),
	true, encoding);
	} catch (UnsupportedEncodingException e) {
	throw new InternalError(encoding + "encoding not found", e);
	}
	in = new BufferedInputStream(server.getInputStream());
	}
	}
	useCrypto = false;
	return this;
	}

	/**
	* Changes the transfer type (binary, ascii, ebcdic) and issue the
	* proper command (e.g. TYPE A) to the server.
	*
	* @param type the <code>FtpTransferType</code> to use.
	* @return This FtpClient
	* @throws IOException if an error occurs during transmission.
	*/
	public sun.net.ftp.FtpClient setType(TransferType type) throws sun.net.ftp.FtpProtocolException, IOException {
	String cmd = "NOOP";

	this.type = type;
	if (type == TransferType.ASCII) {
	cmd = "TYPE A";
	}
	if (type == TransferType.BINARY) {
	cmd = "TYPE I";
	}
	if (type == TransferType.EBCDIC) {
	cmd = "TYPE E";
	}
	issueCommandCheck(cmd);
	return this;
	}

	/**
	* Issues a LIST command to the server to get the current directory
	* listing, and returns the InputStream from the data connection.
	* {@link #completePending()} <b>has</b> to be called once the application
	* is finished writing to the stream.
	*
	* @param path the pathname of the directory to list, or <code>null</code>
	* for the current working directory.
	* @return the <code>InputStream</code> from the resulting data connection
	* @throws IOException if an error occurs during the transmission.
	* @see #changeDirectory(String)
	* @see #listFiles(String)
	*/
	public InputStream list(String path) throws sun.net.ftp.FtpProtocolException, IOException {
	Socket s;
	s = openDataConnection(path == null ? "LIST" : "LIST " + path);
	if (s != null) {
	return createInputStream(s.getInputStream());
	}
	return null;
	}

	/**
	* Issues a NLST path command to server to get the specified directory
	* content. It differs from {@link #list(String)} method by the fact that
	* it will only list the file names which would make the parsing of the
	* somewhat easier.
	*
	* {@link #completePending()} <b>has</b> to be called once the application
	* is finished writing to the stream.
	*
	* @param path a <code>String</code> containing the pathname of the
	* directory to list or <code>null</code> for the current working
	* directory.
	* @return the <code>InputStream</code> from the resulting data connection
	* @throws IOException if an error occurs during the transmission.
	*/
	public InputStream nameList(String path) throws sun.net.ftp.FtpProtocolException, IOException {
	Socket s;
	s = openDataConnection(path == null ? "NLST" : "NLST " + path);
	if (s != null) {
	return createInputStream(s.getInputStream());
	}
	return null;
	}

	/**
	* Issues the SIZE [path] command to the server to get the size of a
	* specific file on the server.
	* Note that this command may not be supported by the server. In which
	* case -1 will be returned.
	*
	* @param path a <code>String</code> containing the pathname of the
	* file.
	* @return a <code>long</code> containing the size of the file or -1 if
	* the server returned an error, which can be checked with
	* {@link #getLastReplyCode()}.
	* @throws IOException if an error occurs during the transmission.
	*/
	public long getSize(String path) throws sun.net.ftp.FtpProtocolException, IOException {
	if (path == null \|\| path.length() == 0) {
	throw new IllegalArgumentException("path can't be null or empty");
	}
	issueCommandCheck("SIZE " + path);
	if (lastReplyCode == FtpReplyCode.FILE_STATUS) {
	String s = getResponseString();
	s = s.substring(4, s.length() - 1);
	return Long.parseLong(s);
	}
	return -1;
	}
	private static String[] MDTMformats = {
	"yyyyMMddHHmmss.SSS",
	"yyyyMMddHHmmss"
	};
	private static SimpleDateFormat[] dateFormats = new SimpleDateFormat[MDTMformats.length];

	static {
	for (int i = 0; i < MDTMformats.length; i++) {
	dateFormats[i] = new SimpleDateFormat(MDTMformats[i]);
	dateFormats[i].setTimeZone(TimeZone.getTimeZone("GMT"));
	}
	}

	/**
	* Issues the MDTM [path] command to the server to get the modification
	* time of a specific file on the server.
	* Note that this command may not be supported by the server, in which
	* case <code>null</code> will be returned.
	*
	* @param path a <code>String</code> containing the pathname of the file.
	* @return a <code>Date</code> representing the last modification time
	* or <code>null</code> if the server returned an error, which
	* can be checked with {@link #getLastReplyCode()}.
	* @throws IOException if an error occurs during the transmission.
	*/
	public Date getLastModified(String path) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("MDTM " + path);
	if (lastReplyCode == FtpReplyCode.FILE_STATUS) {
	String s = getResponseString().substring(4);
	Date d = null;
	for (SimpleDateFormat dateFormat : dateFormats) {
	try {
	d = dateFormat.parse(s);
	} catch (ParseException ex) {
	}
	if (d != null) {
	return d;
	}
	}
	}
	return null;
	}

	/**
	* Sets the parser used to handle the directory output to the specified
	* one. By default the parser is set to one that can handle most FTP
	* servers output (Unix base mostly). However it may be necessary for
	* and application to provide its own parser due to some uncommon
	* output format.
	*
	* @param p The <code>FtpDirParser</code> to use.
	* @see #listFiles(String)
	*/
	public sun.net.ftp.FtpClient setDirParser(FtpDirParser p) {
	parser = p;
	return this;
	}

	private class FtpFileIterator implements Iterator<FtpDirEntry>, Closeable {

	private BufferedReader in = null;
	private FtpDirEntry nextFile = null;
	private FtpDirParser fparser = null;
	private boolean eof = false;

	public FtpFileIterator(FtpDirParser p, BufferedReader in) {
	this.in = in;
	this.fparser = p;
	readNext();
	}

	private void readNext() {
	nextFile = null;
	if (eof) {
	return;
	}
	String line = null;
	try {
	do {
	line = in.readLine();
	if (line != null) {
	nextFile = fparser.parseLine(line);
	if (nextFile != null) {
	return;
	}
	}
	} while (line != null);
	in.close();
	} catch (IOException iOException) {
	}
	eof = true;
	}

	public boolean hasNext() {
	return nextFile != null;
	}

	public FtpDirEntry next() {
	FtpDirEntry ret = nextFile;
	readNext();
	return ret;
	}

	public void remove() {
	throw new UnsupportedOperationException("Not supported yet.");
	}

	public void close() throws IOException {
	if (in != null && !eof) {
	in.close();
	}
	eof = true;
	nextFile = null;
	}
	}

	/**
	* Issues a MLSD command to the server to get the specified directory
	* listing and applies the current parser to create an Iterator of
	* {@link java.net.ftp.FtpDirEntry}. Note that the Iterator returned is also a
	* {@link java.io.Closeable}.
	* If the server doesn't support the MLSD command, the LIST command is used
	* instead.
	*
	* {@link #completePending()} <b>has</b> to be called once the application
	* is finished iterating through the files.
	*
	* @param path the pathname of the directory to list or <code>null</code>
	* for the current working directoty.
	* @return a <code>Iterator</code> of files or <code>null</code> if the
	* command failed.
	* @throws IOException if an error occurred during the transmission
	* @see #setDirParser(FtpDirParser)
	* @see #changeDirectory(String)
	*/
	public Iterator<FtpDirEntry> listFiles(String path) throws sun.net.ftp.FtpProtocolException, IOException {
	Socket s = null;
	BufferedReader sin = null;
	try {
	s = openDataConnection(path == null ? "MLSD" : "MLSD " + path);
	} catch (sun.net.ftp.FtpProtocolException FtpException) {
	// The server doesn't understand new MLSD command, ignore and fall
	// back to LIST
	}

	if (s != null) {
	sin = new BufferedReader(new InputStreamReader(s.getInputStream()));
	return new FtpFileIterator(mlsxParser, sin);
	} else {
	s = openDataConnection(path == null ? "LIST" : "LIST " + path);
	if (s != null) {
	sin = new BufferedReader(new InputStreamReader(s.getInputStream()));
	return new FtpFileIterator(parser, sin);
	}
	}
	return null;
	}

	private boolean sendSecurityData(byte[] buf) throws IOException,
	sun.net.ftp.FtpProtocolException {
	String s = Base64.getMimeEncoder().encodeToString(buf);
	return issueCommand("ADAT " + s);
	}

	private byte[] getSecurityData() {
	String s = getLastResponseString();
	if (s.substring(4, 9).equalsIgnoreCase("ADAT=")) {
	// Need to get rid of the leading '315 ADAT='
	// and the trailing newline
	return Base64.getMimeDecoder().decode(s.substring(9, s.length() - 1));
	}
	return null;
	}

	/**
	* Attempts to use Kerberos GSSAPI as an authentication mechanism with the
	* ftp server. This will issue an <code>AUTH GSSAPI</code> command, and if
	* it is accepted by the server, will followup with <code>ADAT</code>
	* command to exchange the various tokens until authentification is
	* successful. This conforms to Appendix I of RFC 2228.
	*
	* @return <code>true</code> if authentication was successful.
	* @throws IOException if an error occurs during the transmission.
	*/
	public sun.net.ftp.FtpClient useKerberos() throws sun.net.ftp.FtpProtocolException, IOException {
	/*
	* Comment out for the moment since it's not in use and would create
	* needless cross-package links.
	*
	issueCommandCheck("AUTH GSSAPI");
	if (lastReplyCode != FtpReplyCode.NEED_ADAT)
	throw new sun.net.ftp.FtpProtocolException("Unexpected reply from server");
	try {
	GSSManager manager = GSSManager.getInstance();
	GSSName name = manager.createName("SERVICE:ftp@"+
	serverAddr.getHostName(), null);
	GSSContext context = manager.createContext(name, null, null,
	GSSContext.DEFAULT_LIFETIME);
	context.requestMutualAuth(true);
	context.requestReplayDet(true);
	context.requestSequenceDet(true);
	context.requestCredDeleg(true);
	byte []inToken = new byte[0];
	while (!context.isEstablished()) {
	byte[] outToken
	= context.initSecContext(inToken, 0, inToken.length);
	// send the output token if generated
	if (outToken != null) {
	if (sendSecurityData(outToken)) {
	inToken = getSecurityData();
	}
	}
	}
	loggedIn = true;
	} catch (GSSException e) {

	}
	*/
	return this;
	}

	/**
	* Returns the Welcome string the server sent during initial connection.
	*
	* @return a <code>String</code> containing the message the server
	* returned during connection or <code>null</code>.
	*/
	public String getWelcomeMsg() {
	return welcomeMsg;
	}

	/**
	* Returns the last reply code sent by the server.
	*
	* @return the lastReplyCode
	*/
	public FtpReplyCode getLastReplyCode() {
	return lastReplyCode;
	}

	/**
	* Returns the last response string sent by the server.
	*
	* @return the message string, which can be quite long, last returned
	* by the server.
	*/
	public String getLastResponseString() {
	StringBuilder sb = new StringBuilder();
	if (serverResponse != null) {
	for (String l : serverResponse) {
	if (l != null) {
	sb.append(l);
	}
	}
	}
	return sb.toString();
	}

	/**
	* Returns, when available, the size of the latest started transfer.
	* This is retreived by parsing the response string received as an initial
	* response to a RETR or similar request.
	*
	* @return the size of the latest transfer or -1 if either there was no
	* transfer or the information was unavailable.
	*/
	public long getLastTransferSize() {
	return lastTransSize;
	}

	/**
	* Returns, when available, the remote name of the last transfered file.
	* This is mainly useful for "put" operation when the unique flag was
	* set since it allows to recover the unique file name created on the
	* server which may be different from the one submitted with the command.
	*
	* @return the name the latest transfered file remote name, or
	* <code>null</code> if that information is unavailable.
	*/
	public String getLastFileName() {
	return lastFileName;
	}

	/**
	* Attempts to switch to a secure, encrypted connection. This is done by
	* sending the "AUTH TLS" command.
	* <p>See <a href="http://www.ietf.org/rfc/rfc4217.txt">RFC 4217</a></p>
	* If successful this will establish a secure command channel with the
	* server, it will also make it so that all other transfers (e.g. a RETR
	* command) will be done over an encrypted channel as well unless a
	* {@link #reInit()} command or a {@link #endSecureSession()} command is issued.
	*
	* @return <code>true</code> if the operation was successful.
	* @throws IOException if an error occurred during the transmission.
	* @see #endSecureSession()
	*/
	public sun.net.ftp.FtpClient startSecureSession() throws sun.net.ftp.FtpProtocolException, IOException {
	if (!isConnected()) {
	throw new sun.net.ftp.FtpProtocolException("Not connected yet", FtpReplyCode.BAD_SEQUENCE);
	}
	if (sslFact == null) {
	try {
	sslFact = (SSLSocketFactory) SSLSocketFactory.getDefault();
	} catch (Exception e) {
	throw new IOException(e.getLocalizedMessage());
	}
	}
	issueCommandCheck("AUTH TLS");
	Socket s = null;
	try {
	s = sslFact.createSocket(server, serverAddr.getHostName(), serverAddr.getPort(), true);
	} catch (javax.net.ssl.SSLException ssle) {
	try {
	disconnect();
	} catch (Exception e) {
	}
	throw ssle;
	}
	// Remember underlying socket so we can restore it later
	oldSocket = server;
	server = s;
	try {
	out = new PrintStream(new BufferedOutputStream(server.getOutputStream()),
	true, encoding);
	} catch (UnsupportedEncodingException e) {
	throw new InternalError(encoding + "encoding not found", e);
	}
	in = new BufferedInputStream(server.getInputStream());

	issueCommandCheck("PBSZ 0");
	issueCommandCheck("PROT P");
	useCrypto = true;
	return this;
	}

	/**
	* Sends a <code>CCC</code> command followed by a <code>PROT C</code>
	* command to the server terminating an encrypted session and reverting
	* back to a non crypted transmission.
	*
	* @return <code>true</code> if the operation was successful.
	* @throws IOException if an error occurred during transmission.
	* @see #startSecureSession()
	*/
	public sun.net.ftp.FtpClient endSecureSession() throws sun.net.ftp.FtpProtocolException, IOException {
	if (!useCrypto) {
	return this;
	}

	issueCommandCheck("CCC");
	issueCommandCheck("PROT C");
	useCrypto = false;
	// Restore previous socket and streams
	server = oldSocket;
	oldSocket = null;
	try {
	out = new PrintStream(new BufferedOutputStream(server.getOutputStream()),
	true, encoding);
	} catch (UnsupportedEncodingException e) {
	throw new InternalError(encoding + "encoding not found", e);
	}
	in = new BufferedInputStream(server.getInputStream());

	return this;
	}

	/**
	* Sends the "Allocate" (ALLO) command to the server telling it to
	* pre-allocate the specified number of bytes for the next transfer.
	*
	* @param size The number of bytes to allocate.
	* @return <code>true</code> if the operation was successful.
	* @throws IOException if an error occurred during the transmission.
	*/
	public sun.net.ftp.FtpClient allocate(long size) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("ALLO " + size);
	return this;
	}

	/**
	* Sends the "Structure Mount" (SMNT) command to the server. This let the
	* user mount a different file system data structure without altering his
	* login or accounting information.
	*
	* @param struct a <code>String</code> containing the name of the
	* structure to mount.
	* @return <code>true</code> if the operation was successful.
	* @throws IOException if an error occurred during the transmission.
	*/
	public sun.net.ftp.FtpClient structureMount(String struct) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("SMNT " + struct);
	return this;
	}

	/**
	* Sends a SYST (System) command to the server and returns the String
	* sent back by the server describing the operating system at the
	* server.
	*
	* @return a <code>String</code> describing the OS, or <code>null</code>
	* if the operation was not successful.
	* @throws IOException if an error occurred during the transmission.
	*/
	public String getSystem() throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("SYST");
	/*
	* 215 UNIX Type: L8 Version: SUNOS
	*/
	String resp = getResponseString();
	// Get rid of the leading code and blank
	return resp.substring(4);
	}

	/**
	* Sends the HELP command to the server, with an optional command, like
	* SITE, and returns the text sent back by the server.
	*
	* @param cmd the command for which the help is requested or
	* <code>null</code> for the general help
	* @return a <code>String</code> containing the text sent back by the
	* server, or <code>null</code> if the command failed.
	* @throws IOException if an error occurred during transmission
	*/
	public String getHelp(String cmd) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("HELP " + cmd);
	/**
	*
	* HELP
	* 214-The following commands are implemented.
	* USER EPRT STRU ALLO DELE SYST RMD MDTM ADAT
	* PASS EPSV MODE REST CWD STAT PWD PROT
	* QUIT LPRT RETR RNFR LIST HELP CDUP PBSZ
	* PORT LPSV STOR RNTO NLST NOOP STOU AUTH
	* PASV TYPE APPE ABOR SITE MKD SIZE CCC
	* 214 Direct comments to ftp-bugs@jsn.
	*
	* HELP SITE
	* 214-The following SITE commands are implemented.
	* UMASK HELP GROUPS
	* IDLE ALIAS CHECKMETHOD
	* CHMOD CDPATH CHECKSUM
	* 214 Direct comments to ftp-bugs@jsn.
	*/
	Vector<String> resp = getResponseStrings();
	if (resp.size() == 1) {
	// Single line response
	return resp.get(0).substring(4);
	}
	// on multiple lines answers, like the ones above, remove 1st and last
	// line, concat the others.
	StringBuilder sb = new StringBuilder();
	for (int i = 1; i < resp.size() - 1; i++) {
	sb.append(resp.get(i).substring(3));
	}
	return sb.toString();
	}

	/**
	* Sends the SITE command to the server. This is used by the server
	* to provide services specific to his system that are essential
	* to file transfer.
	*
	* @param cmd the command to be sent.
	* @return <code>true</code> if the command was successful.
	* @throws IOException if an error occurred during transmission
	*/
	public sun.net.ftp.FtpClient siteCmd(String cmd) throws sun.net.ftp.FtpProtocolException, IOException {
	issueCommandCheck("SITE " + cmd);
	return this;
	}
	}

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