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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.filetransfer;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PushbackInputStream;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.filter.AndFilter;
import org.jivesoftware.smack.filter.FromMatchesFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamManager;
import org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamRequest;
import org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamSession;
import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream;
import org.jivesoftware.smackx.packet.StreamInitiation;
/**
* Negotiates a SOCKS5 Bytestream to be used for file transfers. The implementation is based on the
* {@link Socks5BytestreamManager} and the {@link Socks5BytestreamRequest}.
*
* @author Henning Staib
* @see <a href="http://xmpp.org/extensions/xep-0065.html">XEP-0065: SOCKS5 Bytestreams</a>
*/
public class Socks5TransferNegotiator extends StreamNegotiator {
private Connection connection;
private Socks5BytestreamManager manager;
Socks5TransferNegotiator(Connection connection) {
this.connection = connection;
this.manager = Socks5BytestreamManager.getBytestreamManager(this.connection);
}
@Override
public OutputStream createOutgoingStream(String streamID, String initiator, String target)
throws XMPPException {
try {
return this.manager.establishSession(target, streamID).getOutputStream();
}
catch (IOException e) {
throw new XMPPException("error establishing SOCKS5 Bytestream", e);
}
catch (InterruptedException e) {
throw new XMPPException("error establishing SOCKS5 Bytestream", e);
}
}
@Override
public InputStream createIncomingStream(StreamInitiation initiation) throws XMPPException,
InterruptedException {
/*
* SOCKS5 initiation listener must ignore next SOCKS5 Bytestream request with given session
* ID
*/
this.manager.ignoreBytestreamRequestOnce(initiation.getSessionID());
Packet streamInitiation = initiateIncomingStream(this.connection, initiation);
return negotiateIncomingStream(streamInitiation);
}
@Override
public PacketFilter getInitiationPacketFilter(final String from, String streamID) {
/*
* this method is always called prior to #negotiateIncomingStream() so the SOCKS5
* InitiationListener must ignore the next SOCKS5 Bytestream request with the given session
* ID
*/
this.manager.ignoreBytestreamRequestOnce(streamID);
return new AndFilter(new FromMatchesFilter(from), new BytestreamSIDFilter(streamID));
}
@Override
public String[] getNamespaces() {
return new String[] { Socks5BytestreamManager.NAMESPACE };
}
@Override
InputStream negotiateIncomingStream(Packet streamInitiation) throws XMPPException,
InterruptedException {
// build SOCKS5 Bytestream request
Socks5BytestreamRequest request = new ByteStreamRequest(this.manager,
(Bytestream) streamInitiation);
// always accept the request
Socks5BytestreamSession session = request.accept();
// test input stream
try {
PushbackInputStream stream = new PushbackInputStream(session.getInputStream());
int firstByte = stream.read();
stream.unread(firstByte);
return stream;
}
catch (IOException e) {
throw new XMPPException("Error establishing input stream", e);
}
}
@Override
public void cleanup() {
/* do nothing */
}
/**
* This PacketFilter accepts an incoming SOCKS5 Bytestream request with a specified session ID.
*/
private static class BytestreamSIDFilter extends PacketTypeFilter {
private String sessionID;
public BytestreamSIDFilter(String sessionID) {
super(Bytestream.class);
if (sessionID == null) {
throw new IllegalArgumentException("StreamID cannot be null");
}
this.sessionID = sessionID;
}
@Override
public boolean accept(Packet packet) {
if (super.accept(packet)) {
Bytestream bytestream = (Bytestream) packet;
// packet must by of type SET and contains the given session ID
return this.sessionID.equals(bytestream.getSessionID())
&& IQ.Type.SET.equals(bytestream.getType());
}
return false;
}
}
/**
* Derive from Socks5BytestreamRequest to access protected constructor.
*/
private static class ByteStreamRequest extends Socks5BytestreamRequest {
private ByteStreamRequest(Socks5BytestreamManager manager, Bytestream byteStreamRequest) {
super(manager, byteStreamRequest);
}
}
}
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