applied patches for extracted api for socks5 bytestreams and in-band bytestream

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/improve_bytestreams@11818 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smackx/socks5bytestream/Socks5ClientForInitiator.java

@@ -0,0 +1,117 @@
+/**
+ * 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.socks5bytestream;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.util.concurrent.TimeoutException;
+
+import org.jivesoftware.smack.Connection;
+import org.jivesoftware.smack.XMPPException;
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.packet.SyncPacketSend;
+import org.jivesoftware.smackx.socks5bytestream.packet.Bytestream;
+import org.jivesoftware.smackx.socks5bytestream.packet.Bytestream.StreamHost;
+
+/**
+ * Implementation of a SOCKS5 client used on the initiators side. This is needed because connecting
+ * to the local SOCKS5 proxy differs form the regular way to connect to a SOCKS5 proxy. Additionally
+ * a remote SOCKS5 proxy has to be activated by the initiator before data can be transferred between
+ * the peers.
+ * 
+ * @author Henning Staib
+ */
+class Socks5ClientForInitiator extends Socks5Client {
+
+    /* the XMPP connection used to communicate with the SOCKS5 proxy */
+    private Connection connection;
+
+    /* the session ID used to activate SOCKS5 stream */
+    private String sessionID;
+
+    /* the target JID used to activate SOCKS5 stream */
+    private String target;
+
+    /**
+     * Creates a new SOCKS5 client for the initiators side.
+     * 
+     * @param streamHost containing network settings of the SOCKS5 proxy
+     * @param digest identifying the SOCKS5 Bytestream
+     * @param connection the XMPP connection
+     * @param sessionID the session ID of the SOCKS5 Bytestream
+     * @param target the target JID of the SOCKS5 Bytestream
+     */
+    public Socks5ClientForInitiator(StreamHost streamHost, String digest, Connection connection,
+                    String sessionID, String target) {
+        super(streamHost, digest);
+        this.connection = connection;
+        this.sessionID = sessionID;
+        this.target = target;
+    }
+
+    public Socket getSocket(int timeout) throws IOException, XMPPException, InterruptedException,
+                    TimeoutException {
+        Socket socket = null;
+
+        // check if stream host is the local SOCKS5 proxy
+        if (this.streamHost.getJID().equals(this.connection.getUser())) {
+            Socks5Proxy socks5Server = Socks5Proxy.getSocks5Proxy();
+            socket = socks5Server.getSocket(this.digest);
+            if (socket == null) {
+                throw new XMPPException("target is not connected to SOCKS5 proxy");
+            }
+        }
+        else {
+            socket = super.getSocket(timeout);
+
+            try {
+                activate();
+            }
+            catch (XMPPException e) {
+                socket.close();
+                throw new XMPPException("activating SOCKS5 Bytestream failed", e);
+            }
+
+        }
+
+        return socket;
+    }
+
+    /**
+     * Activates the SOCKS5 Bytestream by sending a XMPP SOCKS5 Bytestream activation packet to the
+     * SOCKS5 proxy.
+     */
+    private void activate() throws XMPPException {
+        Bytestream activate = createStreamHostActivation();
+        // if activation fails #getReply throws an exception
+        SyncPacketSend.getReply(this.connection, activate);
+    }
+
+    /**
+     * Returns a SOCKS5 Bytestream activation packet.
+     * 
+     * @return SOCKS5 Bytestream activation packet
+     */
+    private Bytestream createStreamHostActivation() {
+        Bytestream activate = new Bytestream(this.sessionID);
+        activate.setMode(null);
+        activate.setType(IQ.Type.SET);
+        activate.setTo(this.streamHost.getJID());
+
+        activate.setToActivate(this.target);
+
+        return activate;
+    }
+
+}