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/*
* ConnectBot: simple, powerful, open-source SSH client for Android
* Copyright 2007 Kenny Root, Jeffrey Sharkey
*
* Licensed 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 com.trilead.ssh2.channel;
import org.connectbot.simplesocks.Socks5Server;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
* DynamicAcceptThread.
*
* @author Kenny Root
* @version $Id$
*/
public class DynamicAcceptThread extends Thread implements IChannelWorkerThread {
private ChannelManager cm;
private ServerSocket ss;
class DynamicAcceptRunnable implements Runnable {
private static final int idleTimeout = 180000; //3 minutes
private Socket sock;
private InputStream in;
private OutputStream out;
public DynamicAcceptRunnable(Socket sock) {
this.sock = sock;
setName("DynamicAcceptRunnable");
}
public void run() {
try {
startSession();
} catch (IOException ioe) {
try {
sock.close();
} catch (IOException ignore) {
}
}
}
private void startSession() throws IOException {
sock.setSoTimeout(idleTimeout);
in = sock.getInputStream();
out = sock.getOutputStream();
Socks5Server server = new Socks5Server(in, out);
try {
if (!server.acceptAuthentication() || !server.readRequest()) {
System.out.println("Could not start SOCKS session");
return;
}
} catch (IOException ioe) {
server.sendReply(Socks5Server.ResponseCode.GENERAL_FAILURE);
return;
}
if (server.getCommand() == Socks5Server.Command.CONNECT) {
onConnect(server);
} else {
server.sendReply(Socks5Server.ResponseCode.COMMAND_NOT_SUPPORTED);
}
}
private void onConnect(Socks5Server server) throws IOException {
final Channel cn;
String destHost = server.getHostName();
if (destHost == null) {
destHost = server.getAddress().getHostAddress();
}
try {
/*
* This may fail, e.g., if the remote port is closed (in
* optimistic terms: not open yet)
*/
cn = cm.openDirectTCPIPChannel(destHost, server.getPort(),
"127.0.0.1", 0);
} catch (IOException e) {
/*
* Try to send a notification back to the client and then close the socket.
*/
try {
server.sendReply(Socks5Server.ResponseCode.GENERAL_FAILURE);
} catch (IOException ignore) {
}
try {
sock.close();
} catch (IOException ignore) {
}
return;
}
server.sendReply(Socks5Server.ResponseCode.SUCCESS);
final StreamForwarder r2l;
final StreamForwarder l2r;
try {
r2l = new StreamForwarder(cn, null, sock, cn.stdoutStream, out, "RemoteToLocal");
l2r = new StreamForwarder(cn, r2l, sock, in, cn.stdinStream, "LocalToRemote");
} catch (IOException e) {
try {
/*
* This message is only visible during debugging, since we
* discard the channel immediatelly
*/
cn.cm.closeChannel(cn,
"Weird error during creation of StreamForwarder ("
+ e.getMessage() + ")", true);
} catch (IOException ignore) {
}
return;
}
r2l.setDaemon(true);
l2r.setDaemon(true);
r2l.start();
l2r.start();
}
}
public DynamicAcceptThread(ChannelManager cm, int local_port)
throws IOException {
this.cm = cm;
setName("DynamicAcceptThread");
ss = new ServerSocket(local_port);
}
public DynamicAcceptThread(ChannelManager cm, InetSocketAddress localAddress)
throws IOException {
this.cm = cm;
ss = new ServerSocket();
ss.bind(localAddress);
}
@Override
public void run() {
try {
cm.registerThread(this);
} catch (IOException e) {
stopWorking();
return;
}
while (true) {
final Socket sock;
try {
sock = ss.accept();
} catch (IOException e) {
stopWorking();
return;
}
DynamicAcceptRunnable dar = new DynamicAcceptRunnable(sock);
Thread t = new Thread(dar);
t.setDaemon(true);
t.start();
}
}
@Override
public void stopWorking() {
try {
/* This will lead to an IOException in the ss.accept() call */
ss.close();
} catch (IOException ignore) {
}
}
}
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