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/**
* All rights reserved. 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 org.jivesoftware.smackx.bytestreams.socks5;
import java.io.IOException;
import java.net.Socket;
import java.util.concurrent.TimeoutException;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.util.SyncPacketSend;
import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream;
import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream.StreamHost;
/**
* Implementation of a SOCKS5 client used on the initiators side. This is needed because connecting
* to the local SOCKS5 proxy differs form the regular way to connect to a SOCKS5 proxy. Additionally
* a remote SOCKS5 proxy has to be activated by the initiator before data can be transferred between
* the peers.
*
* @author Henning Staib
*/
class Socks5ClientForInitiator extends Socks5Client {
/* the XMPP connection used to communicate with the SOCKS5 proxy */
private Connection connection;
/* the session ID used to activate SOCKS5 stream */
private String sessionID;
/* the target JID used to activate SOCKS5 stream */
private String target;
/**
* Creates a new SOCKS5 client for the initiators side.
*
* @param streamHost containing network settings of the SOCKS5 proxy
* @param digest identifying the SOCKS5 Bytestream
* @param connection the XMPP connection
* @param sessionID the session ID of the SOCKS5 Bytestream
* @param target the target JID of the SOCKS5 Bytestream
*/
public Socks5ClientForInitiator(StreamHost streamHost, String digest, Connection connection,
String sessionID, String target) {
super(streamHost, digest);
this.connection = connection;
this.sessionID = sessionID;
this.target = target;
}
public Socket getSocket(int timeout) throws IOException, XMPPException, InterruptedException,
TimeoutException {
Socket socket = null;
// check if stream host is the local SOCKS5 proxy
if (this.streamHost.getJID().equals(this.connection.getUser())) {
Socks5Proxy socks5Server = Socks5Proxy.getSocks5Proxy();
socket = socks5Server.getSocket(this.digest);
if (socket == null) {
throw new XMPPException("target is not connected to SOCKS5 proxy");
}
}
else {
socket = super.getSocket(timeout);
try {
activate();
}
catch (XMPPException e) {
socket.close();
throw new XMPPException("activating SOCKS5 Bytestream failed", e);
}
}
return socket;
}
/**
* Activates the SOCKS5 Bytestream by sending a XMPP SOCKS5 Bytestream activation packet to the
* SOCKS5 proxy.
*/
private void activate() throws XMPPException {
Bytestream activate = createStreamHostActivation();
// if activation fails #getReply throws an exception
SyncPacketSend.getReply(this.connection, activate);
}
/**
* Returns a SOCKS5 Bytestream activation packet.
*
* @return SOCKS5 Bytestream activation packet
*/
private Bytestream createStreamHostActivation() {
Bytestream activate = new Bytestream(this.sessionID);
activate.setMode(null);
activate.setType(IQ.Type.SET);
activate.setTo(this.streamHost.getJID());
activate.setToActivate(this.target);
return activate;
}
}
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