001/**
002 *
003 * Copyright 2003-2005 Jive Software.
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smackx.jingleold.nat;
018
019import org.jivesoftware.smack.SmackException;
020import org.jivesoftware.smack.SmackException.NotConnectedException;
021import org.jivesoftware.smack.XMPPConnection;
022import org.jivesoftware.smack.XMPPException;
023import org.jivesoftware.smack.XMPPException.XMPPErrorException;
024import org.jivesoftware.smackx.jingleold.JingleSession;
025
026import java.net.Inet6Address;
027import java.net.InetAddress;
028import java.net.NetworkInterface;
029import java.net.SocketException;
030import java.util.Enumeration;
031import java.util.Random;
032import java.util.logging.Level;
033import java.util.logging.Logger;
034
035/**
036 * Bridged Resolver use a RTPBridge Service to add a relayed candidate.
037 * A very reliable solution for NAT Traversal.
038 * <p/>
039 * The resolver verify is the XMPP Server that the client is connected offer this service.
040 * If the server supports, a candidate is requested from the service.
041 * The resolver adds this candidate
042 */
043public class BridgedResolver extends TransportResolver {
044    private static final Logger LOGGER = Logger.getLogger(BridgedResolver.class.getName());
045
046    XMPPConnection connection;
047
048    Random random = new Random();
049
050    long sid;
051
052    /**
053     * Constructor.
054     * A Bridged Resolver need an XMPPConnection to connect to a RTP Bridge.
055     */
056    public BridgedResolver(XMPPConnection connection) {
057        super();
058        this.connection = connection;
059    }
060
061    /**
062     * Resolve Bridged Candidate.
063     * <p/>
064     * The BridgedResolver takes the IP addresse and ports of a jmf proxy service.
065     * @throws NotConnectedException 
066     * @throws InterruptedException 
067     */
068    @Override
069    public synchronized void resolve(JingleSession session) throws XMPPException, NotConnectedException, InterruptedException {
070
071        setResolveInit();
072
073        clearCandidates();
074
075        sid = Math.abs(random.nextLong());
076
077        RTPBridge rtpBridge = RTPBridge.getRTPBridge(connection, String.valueOf(sid));
078
079        String localIp = getLocalHost();
080
081        TransportCandidate localCandidate = new TransportCandidate.Fixed(
082                rtpBridge.getIp(), rtpBridge.getPortA());
083        localCandidate.setLocalIp(localIp);
084
085        TransportCandidate remoteCandidate = new TransportCandidate.Fixed(
086                rtpBridge.getIp(), rtpBridge.getPortB());
087        remoteCandidate.setLocalIp(localIp);
088
089        localCandidate.setSymmetric(remoteCandidate);
090        remoteCandidate.setSymmetric(localCandidate);
091
092        localCandidate.setPassword(rtpBridge.getPass());
093        remoteCandidate.setPassword(rtpBridge.getPass());
094
095        localCandidate.setSessionId(rtpBridge.getSid());
096        remoteCandidate.setSessionId(rtpBridge.getSid());
097
098        localCandidate.setConnection(this.connection);
099        remoteCandidate.setConnection(this.connection);
100
101        addCandidate(localCandidate);
102
103        setResolveEnd();
104    }
105
106    @Override
107    public void initialize() throws SmackException, XMPPErrorException, InterruptedException {
108
109        clearCandidates();
110
111        if (!RTPBridge.serviceAvailable(connection)) {
112            setInitialized();
113            throw new SmackException("No RTP Bridge service available");
114        }
115        setInitialized();
116
117    }
118
119    @Override
120    public void cancel() throws XMPPException {
121        // Nothing to do here
122    }
123
124    public static String getLocalHost() {
125        Enumeration<NetworkInterface> ifaces = null;
126
127        try {
128            ifaces = NetworkInterface.getNetworkInterfaces();
129        }
130        catch (SocketException e) {
131            LOGGER.log(Level.WARNING, "exception", e);
132        }
133
134        while (ifaces.hasMoreElements()) {
135
136            NetworkInterface iface = ifaces.nextElement();
137            Enumeration<InetAddress> iaddresses = iface.getInetAddresses();
138
139            while (iaddresses.hasMoreElements()) {
140                InetAddress iaddress = iaddresses.nextElement();
141                if (!iaddress.isLoopbackAddress() && !iaddress.isLinkLocalAddress() && !iaddress.isSiteLocalAddress() && !(iaddress instanceof Inet6Address)) {
142                    return iaddress.getHostAddress();
143                }
144            }
145        }
146
147        try {
148            return InetAddress.getLocalHost().getHostAddress();
149        }
150        catch (Exception e) {
151            LOGGER.log(Level.WARNING, "exception", e);
152        }
153
154        return "127.0.0.1";
155
156    }
157
158}