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/*
ConnectBot: simple, powerful, open-source SSH client for Android
Copyright (C) 2007-2008 Kenny Root, Jeffrey Sharkey
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.trilead.ssh2.channel;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import net.sourceforge.jsocks.Proxy;
import net.sourceforge.jsocks.ProxyMessage;
import net.sourceforge.jsocks.ProxyServer;
import net.sourceforge.jsocks.Socks4Message;
import net.sourceforge.jsocks.Socks5Message;
import net.sourceforge.jsocks.server.ServerAuthenticator;
import net.sourceforge.jsocks.server.ServerAuthenticatorNone;
/**
* DynamicAcceptThread.
*
* @author Kenny Root
* @version $Id:
*/
public class DynamicAcceptThread extends Thread implements IChannelWorkerThread {
private ChannelManager cm;
private ServerSocket ss;
class DynamicAcceptRunnable extends ProxyServer {
private ServerAuthenticator auth;
private Socket sock;
private InputStream in;
private OutputStream out;
private ProxyMessage msg;
public DynamicAcceptRunnable(ServerAuthenticator auth, Socket sock) {
super(auth, sock);
this.auth = auth;
this.sock = sock;
}
protected void startSession() throws IOException {
sock.setSoTimeout(ProxyServer.iddleTimeout);
try {
auth = auth.startSession(sock);
} catch (IOException ioe) {
System.out.println("Could not start SOCKS session");
ioe.printStackTrace();
auth = null;
return;
}
if (auth == null) { // Authentication failed
System.out.println("SOCKS auth failed");
return;
}
in = auth.getInputStream();
out = auth.getOutputStream();
msg = readMsg(in);
handleRequest(msg);
}
protected void onConnect(ProxyMessage msg) throws IOException {
ProxyMessage response = null;
Channel cn = null;
StreamForwarder r2l = null;
StreamForwarder l2r = null;
try {
/*
* This may fail, e.g., if the remote port is closed (in
* optimistic terms: not open yet)
*/
cn = cm.openDirectTCPIPChannel(msg.host, msg.port,
sock.getInetAddress().getHostAddress(),
sock.getPort());
} catch (IOException e) {
/*
* Simply close the local socket and wait for the next incoming
* connection
*/
try {
sock.close();
} catch (IOException ignore) {
}
return;
}
try {
r2l = new StreamForwarder(cn, null, null, 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();
if (msg instanceof Socks5Message) {
response = new Socks5Message(Proxy.SOCKS_SUCCESS, sock
.getLocalAddress(), sock.getLocalPort());
} else {
response = new Socks4Message(Socks4Message.REPLY_OK, sock
.getLocalAddress(), sock.getLocalPort());
}
response.write(out);
}
}
public DynamicAcceptThread(ChannelManager cm, int local_port)
throws IOException {
this.cm = cm;
ss = new ServerSocket(local_port);
}
public DynamicAcceptThread(ChannelManager cm, InetSocketAddress localAddress)
throws IOException {
this.cm = cm;
ss = new ServerSocket();
ss.bind(localAddress);
}
public void run() {
try {
cm.registerThread(this);
} catch (IOException e) {
stopWorking();
return;
}
while (true) {
Socket sock = null;
try {
sock = ss.accept();
} catch (IOException e) {
stopWorking();
return;
}
DynamicAcceptRunnable dar = new DynamicAcceptRunnable(new ServerAuthenticatorNone(), sock);
Thread t = new Thread(dar);
t.setDaemon(true);
t.start();
}
}
/*
* (non-Javadoc)
*
* @see com.trilead.ssh2.channel.IChannelWorkerThread#stopWorking()
*/
public void stopWorking() {
try {
/* This will lead to an IOException in the ss.accept() call */
ss.close();
} catch (IOException e) {
}
}
}
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