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/*
* Copyright (c) 2006, 2019, 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.
*
* 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.
*/
import java.net.*;
import java.io.*;
import java.util.ArrayList;
/**
* This class implements a simple FTP server that can handle multiple
* connections concurrently. This is mostly meant as a test environment.
* You have to provide 2 handlers for it to be effective, one to simulate
* (or access) a filesystem and one to deal with authentication.
* See {@link FtpFileSystemHandler} and {@link FtpAuthHandler}.
*
* Since it is a subclass of Thread, you have to call <code>start()</code>
* To get it running.
*
* Usage example:<p>
*
* <code>
* FtpServer server = new FtpServer(0);
* int port = server.getLocalPort();
* server.setFileSystemHandler(myFSHandler);
* server.setAuthHandler(myAuthHandler);
* server.start();
* </code>
*
*/
public class FtpServer extends Thread implements AutoCloseable {
private ServerSocket listener = null;
private FtpFileSystemHandler fsh = null;
private FtpAuthHandler auth = null;
private boolean done = false;
private ArrayList<FtpCommandHandler> clients = new ArrayList<FtpCommandHandler>();
/**
* Creates an instance of an FTP server which will listen for incoming
* connections on the specified port. If the port is set to 0, it will
* automatically select an available ephemeral port.
*/
public FtpServer(InetAddress addr, int port) throws IOException {
listener = new ServerSocket();
listener.bind(new InetSocketAddress(addr, port));
}
/**
* Creates an instance of an FTP server which will listen for incoming
* connections on the specified port. If the port is set to 0, it will
* automatically select an available ephemeral port.
*/
public FtpServer(int port) throws IOException {
listener = new ServerSocket(port);
}
/**
* Creates an instance of an FTP server that will listen on the default
* FTP port, usually 21.
*/
public FtpServer() throws IOException {
this(21);
}
public void setFileSystemHandler(FtpFileSystemHandler f) {
fsh = f;
}
public void setAuthHandler(FtpAuthHandler a) {
auth = a;
}
public void terminate() {
done = true;
interrupt();
}
public void killClients() {
synchronized (clients) {
int c = clients.size();
while (c > 0) {
c--;
FtpCommandHandler cl = clients.get(c);
cl.terminate();
cl.interrupt();
}
}
}
public int getLocalPort() {
return listener.getLocalPort();
}
public InetAddress getInetAddress() {
return listener.getInetAddress();
}
public String getAuthority() {
InetAddress address = getInetAddress();
String hostaddr = address.isAnyLocalAddress()
? "localhost" : address.getHostAddress();
if (hostaddr.indexOf(':') > -1) {
hostaddr = "[" + hostaddr + "]";
}
return hostaddr + ":" + getLocalPort();
}
void addClient(Socket client) {
FtpCommandHandler h = new FtpCommandHandler(client, this);
h.setHandlers(fsh, auth);
synchronized (clients) {
clients.add(h);
}
h.start();
}
void removeClient(FtpCommandHandler cl) {
synchronized (clients) {
clients.remove(cl);
}
}
public int activeClientsCount() {
synchronized (clients) {
return clients.size();
}
}
public void run() {
Socket client;
try {
while (!done) {
client = listener.accept();
addClient(client);
}
listener.close();
} catch (IOException e) {
}
}
@Override
public void close() throws Exception {
terminate();
listener.close();
if (activeClientsCount() > 0) {
killClients();
}
}
}
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