| /** |
| * 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); |
| } |
| |
| } |
| |
| } |