231 lines
10 KiB
Java
231 lines
10 KiB
Java
/**
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*
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* Copyright © 2017 Paul Schaub
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.jingle_s5b;
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import java.io.IOException;
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import java.lang.ref.WeakReference;
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import java.net.Socket;
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import java.util.concurrent.TimeoutException;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import org.jivesoftware.smack.SmackException;
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import org.jivesoftware.smack.XMPPConnection;
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import org.jivesoftware.smack.XMPPException;
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import org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamSession;
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import org.jivesoftware.smackx.bytestreams.socks5.Socks5Client;
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import org.jivesoftware.smackx.bytestreams.socks5.Socks5Proxy;
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import org.jivesoftware.smackx.bytestreams.socks5.Socks5Utils;
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import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream;
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import org.jivesoftware.smackx.jingle.JingleManager;
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import org.jivesoftware.smackx.jingle.JingleSessionHandler;
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import org.jivesoftware.smackx.jingle.JingleTransportEstablishedCallback;
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import org.jivesoftware.smackx.jingle.JingleTransportHandler;
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import org.jivesoftware.smackx.jingle.element.Jingle;
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import org.jivesoftware.smackx.jingle.element.JingleAction;
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import org.jivesoftware.smackx.jingle.element.JingleContent;
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import org.jivesoftware.smackx.jingle.element.JingleContentTransport;
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import org.jivesoftware.smackx.jingle.element.JingleContentTransportCandidate;
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import org.jivesoftware.smackx.jingle_s5b.elements.JingleS5BTransport;
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import org.jivesoftware.smackx.jingle_s5b.elements.JingleS5BTransportCandidate;
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import org.jivesoftware.smackx.jingle_s5b.elements.JingleS5BTransportInfo;
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/**
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* JingleTransportHandler for Socks5Bytestreams.
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*/
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public class JingleS5BTransportHandler implements JingleTransportHandler<JingleS5BTransport> {
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private static final Logger LOGGER = Logger.getLogger(JingleS5BTransportHandler.class.getName());
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private final WeakReference<JingleSessionHandler> sessionHandler;
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private JingleS5BTransport myTransport;
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private JingleS5BTransportCandidate receivedCandidateUsed = null;
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private Socket connectedSocket = null;
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public JingleS5BTransportHandler(JingleSessionHandler sessionHandler) {
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this.sessionHandler = new WeakReference<>(sessionHandler);
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}
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@Override
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public void prepareOutgoingSession(JingleManager.FullJidAndSessionId fullJidAndSessionId, JingleContent content) {
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myTransport = (JingleS5BTransport) content.getJingleTransports().get(0);
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Socks5Proxy.getSocks5Proxy().addLocalAddress(myTransport.getDestinationAddress());
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}
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@Override
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public void establishOutgoingSession(JingleManager.FullJidAndSessionId fullJidAndSessionId,
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JingleContent receivedContent,
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JingleContent proposedContent,
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JingleTransportEstablishedCallback callback) {
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establishSession(fullJidAndSessionId, receivedContent, proposedContent, callback);
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}
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@Override
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public void establishIncomingSession(JingleManager.FullJidAndSessionId fullJidAndSessionId,
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JingleContent receivedContent,
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JingleContent proposedContent,
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JingleTransportEstablishedCallback callback) {
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establishSession(fullJidAndSessionId, receivedContent, proposedContent, callback);
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}
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void establishSession(JingleManager.FullJidAndSessionId fullJidAndSessionId,
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JingleContent receivedContent,
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JingleContent proposedContent,
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JingleTransportEstablishedCallback callback) {
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JingleContentTransport hopefullyS5BTransport = receivedContent.getJingleTransports().get(0);
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if (!hopefullyS5BTransport.getNamespace().equals(JingleS5BTransport.NAMESPACE_V1)) {
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throw new IllegalArgumentException("Transport must be a JingleS5BTransport.");
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}
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JingleS5BTransport transport = (JingleS5BTransport) hopefullyS5BTransport;
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Socks5Proxy.getSocks5Proxy().addLocalAddress(Socks5Utils.createDigest(
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fullJidAndSessionId.getSessionId(), //SessionID
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getConnection().getUser().asFullJidIfPossible(), //Us
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fullJidAndSessionId.getFullJid())); //Them
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JingleS5BTransportCandidate usedCandidate = null;
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for (JingleContentTransportCandidate c : transport.getCandidates()) {
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usedCandidate = (JingleS5BTransportCandidate) c;
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Bytestream.StreamHost streamHost = usedCandidate.getStreamHost();
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String address = streamHost.getAddress() + ":" + streamHost.getPort();
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LOGGER.log(Level.INFO, "Connect to " + address);
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// establish socket
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try {
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// build SOCKS5 client
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final Socks5Client socks5Client = new Socks5Client(streamHost, transport.getDestinationAddress());
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// connect to SOCKS5 proxy with a timeout
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connectedSocket = socks5Client.getSocket(10 * 1000);
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// set selected host
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break;
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}
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catch (TimeoutException | IOException | SmackException | XMPPException | InterruptedException e) {
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LOGGER.log(Level.WARNING, "Could not connect to " + address + ": " + e, e);
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}
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}
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if (connectedSocket != null) {
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Jingle.Builder jb = Jingle.getBuilder();
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jb.setSessionId(fullJidAndSessionId.getSessionId())
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.setAction(JingleAction.transport_info)
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.setInitiator(getConnection().getUser());
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JingleContent.Builder cb = JingleContent.getBuilder();
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cb.setName(receivedContent.getName())
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.setCreator(receivedContent.getCreator())
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.setSenders(receivedContent.getSenders());
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JingleS5BTransport.Builder tb = JingleS5BTransport.getBuilder();
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tb.setStreamId(((JingleS5BTransport) receivedContent.getJingleTransports().get(0)).getStreamId());
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tb.setCandidateUsed(usedCandidate.getCandidateId());
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cb.addTransport(tb.build());
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jb.addJingleContent(cb.build());
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Jingle jingle = jb.build();
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jingle.setFrom(getConnection().getUser());
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jingle.setTo(fullJidAndSessionId.getFullJid());
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try {
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getConnection().sendStanza(jingle);
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} catch (SmackException.NotConnectedException | InterruptedException e) {
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LOGGER.log(Level.WARNING, "Could not send candidate-used stanza: " + e, e);
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}
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//Activate proxy
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if (usedCandidate.getType() == JingleS5BTransportCandidate.Type.proxy) {
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Bytestream bytestream = new Bytestream(fullJidAndSessionId.getSessionId());
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bytestream.setToActivate(fullJidAndSessionId.getFullJid());
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bytestream.setTo(usedCandidate.getJid());
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try {
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getConnection().sendStanza(bytestream);
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} catch (SmackException.NotConnectedException | InterruptedException e) {
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LOGGER.log(Level.WARNING, "Could not activate proxy: " + e, e);
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}
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}
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jb = Jingle.getBuilder();
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jb.setAction(JingleAction.transport_info)
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.setSessionId(fullJidAndSessionId.getSessionId());
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//TODO: setInitiator
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cb = JingleContent.getBuilder();
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cb.setCreator(JingleContent.Creator.initiator)
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.setName(receivedContent.getName());
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tb = JingleS5BTransport.getBuilder();
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tb.setStreamId(((JingleS5BTransport) receivedContent.getJingleTransports().get(0)).getStreamId());
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tb.setCandidateActivated(usedCandidate.getCandidateId());
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cb.addTransport(tb.build());
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jb.addJingleContent(cb.build());
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Jingle activate = jb.build();
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activate.setTo(fullJidAndSessionId.getFullJid());
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activate.setFrom(getConnection().getUser());
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try {
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getConnection().sendStanza(activate);
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} catch (SmackException.NotConnectedException | InterruptedException e) {
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LOGGER.log(Level.SEVERE, "Could not send transport-activated: " + e, e);
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}
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callback.onSessionEstablished(new Socks5BytestreamSession(connectedSocket, false));
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} else {
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}
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}
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@Override
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public XMPPConnection getConnection() {
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JingleSessionHandler handler = sessionHandler.get();
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return handler != null ? handler.getConnection() : null;
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}
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public void setReceivedCandidateUsed(JingleS5BTransportCandidate used) {
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this.receivedCandidateUsed = used;
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}
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@Override
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public void onTransportInfoReceived(Jingle jingle) {
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if (jingle.getAction() != JingleAction.transport_info) {
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throw new IllegalArgumentException("Jingle Action must be transport-info.");
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}
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JingleContentTransport jingleTransport = jingle.getContents().get(0).getJingleTransports().get(0);
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if (jingleTransport == null || !jingleTransport.getNamespace().equals(JingleS5BTransport.NAMESPACE_V1)) {
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throw new IllegalArgumentException("Jingle must contain transport of type S5B.");
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}
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JingleS5BTransport transport = (JingleS5BTransport) jingleTransport;
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JingleS5BTransportInfo info = (JingleS5BTransportInfo) transport.getInfos().get(0);
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if (info == null) {
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throw new IllegalArgumentException("Jingle must contain at least one JingleS5BTransportInfo.");
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}
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if (info.getElementName().equals(JingleS5BTransportInfo.CandidateUsed.ELEMENT)) {
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String candidateUsedId = ((JingleS5BTransportInfo.CandidateUsed) info).getCandidateId();
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}
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}
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}
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