Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /**
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| 2 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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| 3 | * you may not use this file except in compliance with the License.
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| 4 | * You may obtain a copy of the License at
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| 5 | *
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| 6 | * http://www.apache.org/licenses/LICENSE-2.0
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| 7 | *
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| 8 | * Unless required by applicable law or agreed to in writing, software
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| 9 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 10 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 11 | * See the License for the specific language governing permissions and
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| 12 | * limitations under the License.
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| 13 | */
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| 14 | package org.jivesoftware.smackx.bytestreams.socks5;
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| 15 |
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| 16 | import java.io.IOException;
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| 17 | import java.net.Socket;
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| 18 | import java.util.concurrent.TimeoutException;
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| 19 |
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| 20 | import org.jivesoftware.smack.Connection;
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| 21 | import org.jivesoftware.smack.XMPPException;
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| 22 | import org.jivesoftware.smack.packet.IQ;
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| 23 | import org.jivesoftware.smack.util.SyncPacketSend;
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| 24 | import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream;
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| 25 | import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream.StreamHost;
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| 26 |
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| 27 | /**
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| 28 | * Implementation of a SOCKS5 client used on the initiators side. This is needed because connecting
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| 29 | * to the local SOCKS5 proxy differs form the regular way to connect to a SOCKS5 proxy. Additionally
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| 30 | * a remote SOCKS5 proxy has to be activated by the initiator before data can be transferred between
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| 31 | * the peers.
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| 32 | *
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| 33 | * @author Henning Staib
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| 34 | */
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| 35 | class Socks5ClientForInitiator extends Socks5Client {
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| 36 |
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| 37 | /* the XMPP connection used to communicate with the SOCKS5 proxy */
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| 38 | private Connection connection;
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| 39 |
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| 40 | /* the session ID used to activate SOCKS5 stream */
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| 41 | private String sessionID;
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| 42 |
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| 43 | /* the target JID used to activate SOCKS5 stream */
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| 44 | private String target;
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| 45 |
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| 46 | /**
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| 47 | * Creates a new SOCKS5 client for the initiators side.
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| 48 | *
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| 49 | * @param streamHost containing network settings of the SOCKS5 proxy
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| 50 | * @param digest identifying the SOCKS5 Bytestream
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| 51 | * @param connection the XMPP connection
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| 52 | * @param sessionID the session ID of the SOCKS5 Bytestream
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| 53 | * @param target the target JID of the SOCKS5 Bytestream
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| 54 | */
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| 55 | public Socks5ClientForInitiator(StreamHost streamHost, String digest, Connection connection,
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| 56 | String sessionID, String target) {
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| 57 | super(streamHost, digest);
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| 58 | this.connection = connection;
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| 59 | this.sessionID = sessionID;
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| 60 | this.target = target;
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| 61 | }
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| 62 |
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| 63 | public Socket getSocket(int timeout) throws IOException, XMPPException, InterruptedException,
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| 64 | TimeoutException {
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| 65 | Socket socket = null;
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| 66 |
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| 67 | // check if stream host is the local SOCKS5 proxy
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| 68 | if (this.streamHost.getJID().equals(this.connection.getUser())) {
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| 69 | Socks5Proxy socks5Server = Socks5Proxy.getSocks5Proxy();
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| 70 | socket = socks5Server.getSocket(this.digest);
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| 71 | if (socket == null) {
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| 72 | throw new XMPPException("target is not connected to SOCKS5 proxy");
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| 73 | }
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| 74 | }
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| 75 | else {
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| 76 | socket = super.getSocket(timeout);
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| 77 |
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| 78 | try {
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| 79 | activate();
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| 80 | }
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| 81 | catch (XMPPException e) {
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| 82 | socket.close();
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| 83 | throw new XMPPException("activating SOCKS5 Bytestream failed", e);
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| 84 | }
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| 85 |
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| 86 | }
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| 87 |
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| 88 | return socket;
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| 89 | }
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| 90 |
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| 91 | /**
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| 92 | * Activates the SOCKS5 Bytestream by sending a XMPP SOCKS5 Bytestream activation packet to the
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| 93 | * SOCKS5 proxy.
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| 94 | */
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| 95 | private void activate() throws XMPPException {
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| 96 | Bytestream activate = createStreamHostActivation();
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| 97 | // if activation fails #getReply throws an exception
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| 98 | SyncPacketSend.getReply(this.connection, activate);
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| 99 | }
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| 100 |
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| 101 | /**
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| 102 | * Returns a SOCKS5 Bytestream activation packet.
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| 103 | *
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| 104 | * @return SOCKS5 Bytestream activation packet
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| 105 | */
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| 106 | private Bytestream createStreamHostActivation() {
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| 107 | Bytestream activate = new Bytestream(this.sessionID);
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| 108 | activate.setMode(null);
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| 109 | activate.setType(IQ.Type.SET);
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| 110 | activate.setTo(this.streamHost.getJID());
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| 111 |
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| 112 | activate.setToActivate(this.target);
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| 113 |
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| 114 | return activate;
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| 115 | }
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| 116 |
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| 117 | }
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