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XMPPTCPConnection.java
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XMPPTCPConnection.java
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/**
*
* Copyright 2003-2007 Jive Software.
*
* 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.smack.tcp;
import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.ConnectionCreationListener;
import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.SmackException.AlreadyLoggedInException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.SmackException.ConnectionException;
import org.jivesoftware.smack.SmackException.SecurityNotPossibleException;
import org.jivesoftware.smack.SmackException.SecurityRequiredException;
import org.jivesoftware.smack.XMPPException.StreamErrorException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.compression.XMPPInputOutputStream;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.parsing.ParsingExceptionCallback;
import org.jivesoftware.smack.parsing.UnparsablePacket;
import org.jivesoftware.smack.sasl.SASLMechanism.Challenge;
import org.jivesoftware.smack.sasl.SASLMechanism.SASLFailure;
import org.jivesoftware.smack.sasl.SASLMechanism.Success;
import org.jivesoftware.smack.util.ArrayBlockingQueueWithShutdown;
import org.jivesoftware.smack.util.PacketParserUtils;
import org.jivesoftware.smack.util.TLSUtils;
import org.jivesoftware.smack.util.dns.HostAddress;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.PasswordCallback;
import javax.security.sasl.SaslException;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.lang.reflect.Constructor;
import java.net.Socket;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.Security;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Creates a socket connection to a XMPP server. This is the default connection
* to a Jabber server and is specified in the XMPP Core (RFC 3920).
*
* @see XMPPConnection
* @author Matt Tucker
*/
public class XMPPTCPConnection extends AbstractXMPPConnection {
private static final Logger LOGGER = Logger.getLogger(XMPPTCPConnection.class.getName());
/**
* The socket which is used for this connection.
*/
private Socket socket;
private String connectionID = null;
private String user = null;
private boolean connected = false;
// socketClosed is used concurrent
// by XMPPTCPConnection, PacketReader, PacketWriter
private volatile boolean socketClosed = false;
private boolean anonymous = false;
private boolean usingTLS = false;
private ParsingExceptionCallback parsingExceptionCallback = SmackConfiguration.getDefaultParsingExceptionCallback();
private PacketWriter packetWriter;
private PacketReader packetReader;
/**
* Collection of available stream compression methods offered by the server.
*/
private Collection<String> compressionMethods;
/**
* Set to true by packet writer if the server acknowledged the compression
*/
private boolean serverAckdCompression = false;
/**
* Lock for the wait()/notify() pattern for the compression negotiation
*/
private final Object compressionLock = new Object();
/**
* Creates a new connection to the specified XMPP server. A DNS SRV lookup will be
* performed to determine the IP address and port corresponding to the
* service name; if that lookup fails, it's assumed that server resides at
* <tt>serviceName</tt> with the default port of 5222. Encrypted connections (TLS)
* will be used if available, stream compression is disabled, and standard SASL
* mechanisms will be used for authentication.<p>
* <p/>
* This is the simplest constructor for connecting to an XMPP server. Alternatively,
* you can get fine-grained control over connection settings using the
* {@link #XMPPTCPConnection(ConnectionConfiguration)} constructor.<p>
* <p/>
* Note that XMPPTCPConnection constructors do not establish a connection to the server
* and you must call {@link #connect()}.<p>
* <p/>
* The CallbackHandler will only be used if the connection requires the client provide
* an SSL certificate to the server. The CallbackHandler must handle the PasswordCallback
* to prompt for a password to unlock the keystore containing the SSL certificate.
*
* @param serviceName the name of the XMPP server to connect to; e.g. <tt>example.com</tt>.
* @param callbackHandler the CallbackHandler used to prompt for the password to the keystore.
*/
public XMPPTCPConnection(String serviceName, CallbackHandler callbackHandler) {
// Create the configuration for this new connection
super(new ConnectionConfiguration(serviceName));
config.setCallbackHandler(callbackHandler);
}
/**
* Creates a new XMPP connection in the same way {@link #XMPPTCPConnection(String,CallbackHandler)} does, but
* with no callback handler for password prompting of the keystore. This will work
* in most cases, provided the client is not required to provide a certificate to
* the server.
*
* @param serviceName the name of the XMPP server to connect to; e.g. <tt>example.com</tt>.
*/
public XMPPTCPConnection(String serviceName) {
// Create the configuration for this new connection
super(new ConnectionConfiguration(serviceName));
}
/**
* Creates a new XMPP connection in the same way {@link #XMPPTCPConnection(ConnectionConfiguration,CallbackHandler)} does, but
* with no callback handler for password prompting of the keystore. This will work
* in most cases, provided the client is not required to provide a certificate to
* the server.
*
*
* @param config the connection configuration.
*/
public XMPPTCPConnection(ConnectionConfiguration config) {
super(config);
}
/**
* Creates a new XMPP connection using the specified connection configuration.<p>
* <p/>
* Manually specifying connection configuration information is suitable for
* advanced users of the API. In many cases, using the
* {@link #XMPPTCPConnection(String)} constructor is a better approach.<p>
* <p/>
* Note that XMPPTCPConnection constructors do not establish a connection to the server
* and you must call {@link #connect()}.<p>
* <p/>
*
* The CallbackHandler will only be used if the connection requires the client provide
* an SSL certificate to the server. The CallbackHandler must handle the PasswordCallback
* to prompt for a password to unlock the keystore containing the SSL certificate.
*
* @param config the connection configuration.
* @param callbackHandler the CallbackHandler used to prompt for the password to the keystore.
*/
public XMPPTCPConnection(ConnectionConfiguration config, CallbackHandler callbackHandler) {
super(config);
config.setCallbackHandler(callbackHandler);
}
@Override
public String getConnectionID() {
if (!isConnected()) {
return null;
}
return connectionID;
}
@Override
public String getUser() {
if (!isAuthenticated()) {
return null;
}
return user;
}
/**
* Install a parsing exception callback, which will be invoked once an exception is encountered while parsing a
* stanza
*
* @param callback the callback to install
*/
public void setParsingExceptionCallback(ParsingExceptionCallback callback) {
parsingExceptionCallback = callback;
}
/**
* Get the current active parsing exception callback.
*
* @return the active exception callback or null if there is none
*/
public ParsingExceptionCallback getParsingExceptionCallback() {
return parsingExceptionCallback;
}
@Override
public synchronized void login(String username, String password, String resource) throws XMPPException, SmackException, SaslException, IOException {
if (!isConnected()) {
throw new NotConnectedException();
}
if (authenticated) {
throw new AlreadyLoggedInException();
}
// Do partial version of nameprep on the username.
username = username.toLowerCase(Locale.US).trim();
if (saslAuthentication.hasNonAnonymousAuthentication()) {
// Authenticate using SASL
if (password != null) {
saslAuthentication.authenticate(username, password, resource);
}
else {
saslAuthentication.authenticate(resource, config.getCallbackHandler());
}
} else {
throw new SaslException("No non-anonymous SASL authentication mechanism available");
}
// If compression is enabled then request the server to use stream compression. XEP-170
// recommends to perform stream compression before resource binding.
if (config.isCompressionEnabled()) {
useCompression();
}
// Set the user.
String response = bindResourceAndEstablishSession(resource);
if (response != null) {
this.user = response;
// Update the serviceName with the one returned by the server
setServiceName(response);
}
else {
this.user = username + "@" + getServiceName();
if (resource != null) {
this.user += "/" + resource;
}
}
// Indicate that we're now authenticated.
authenticated = true;
anonymous = false;
// Set presence to online.
if (config.isSendPresence()) {
sendPacket(new Presence(Presence.Type.available));
}
// Stores the authentication for future reconnection
setLoginInfo(username, password, resource);
// If debugging is enabled, change the the debug window title to include the
// name we are now logged-in as.
// If DEBUG_ENABLED was set to true AFTER the connection was created the debugger
// will be null
if (config.isDebuggerEnabled() && debugger != null) {
debugger.userHasLogged(user);
}
callConnectionAuthenticatedListener();
}
@Override
public synchronized void loginAnonymously() throws XMPPException, SmackException, SaslException, IOException {
if (!isConnected()) {
throw new NotConnectedException();
}
if (authenticated) {
throw new AlreadyLoggedInException();
}
if (saslAuthentication.hasAnonymousAuthentication()) {
saslAuthentication.authenticateAnonymously();
}
else {
throw new SaslException("No anonymous SASL authentication mechanism available");
}
String response = bindResourceAndEstablishSession(null);
// Set the user value.
this.user = response;
// Update the serviceName with the one returned by the server
setServiceName(response);
// If compression is enabled then request the server to use stream compression
if (config.isCompressionEnabled()) {
useCompression();
}
// Set presence to online.
sendPacket(new Presence(Presence.Type.available));
// Indicate that we're now authenticated.
authenticated = true;
anonymous = true;
// If debugging is enabled, change the the debug window title to include the
// name we are now logged-in as.
// If DEBUG_ENABLED was set to true AFTER the connection was created the debugger
// will be null
if (config.isDebuggerEnabled() && debugger != null) {
debugger.userHasLogged(user);
}
callConnectionAuthenticatedListener();
}
@Override
public boolean isConnected() {
return connected;
}
@Override
public boolean isSecureConnection() {
return usingTLS;
}
public boolean isSocketClosed() {
return socketClosed;
}
@Override
public boolean isAuthenticated() {
return authenticated;
}
@Override
public boolean isAnonymous() {
return anonymous;
}
/**
* Shuts the current connection down. After this method returns, the connection must be ready
* for re-use by connect.
*/
@Override
protected void shutdown() {
if (packetReader != null) {
packetReader.shutdown();
}
if (packetWriter != null) {
packetWriter.shutdown();
}
// Set socketClosed to true. This will cause the PacketReader
// and PacketWriter to ignore any Exceptions that are thrown
// because of a read/write from/to a closed stream.
// It is *important* that this is done before socket.close()!
socketClosed = true;
try {
socket.close();
} catch (Exception e) {
LOGGER.log(Level.WARNING, "shutdown", e);
}
setWasAuthenticated(authenticated);
authenticated = false;
connected = false;
usingTLS = false;
reader = null;
writer = null;
}
@Override
protected void sendPacketInternal(Packet packet) throws NotConnectedException {
packetWriter.sendPacket(packet);
}
private void connectUsingConfiguration(ConnectionConfiguration config) throws SmackException, IOException {
try {
maybeResolveDns();
}
catch (Exception e) {
throw new SmackException(e);
}
Iterator<HostAddress> it = config.getHostAddresses().iterator();
List<HostAddress> failedAddresses = new LinkedList<HostAddress>();
while (it.hasNext()) {
Exception exception = null;
HostAddress hostAddress = it.next();
String host = hostAddress.getFQDN();
int port = hostAddress.getPort();
try {
if (config.getSocketFactory() == null) {
this.socket = new Socket(host, port);
}
else {
this.socket = config.getSocketFactory().createSocket(host, port);
}
} catch (Exception e) {
exception = e;
}
if (exception == null) {
// We found a host to connect to, break here
this.host = host;
this.port = port;
break;
}
hostAddress.setException(exception);
failedAddresses.add(hostAddress);
if (!it.hasNext()) {
// There are no more host addresses to try
// throw an exception and report all tried
// HostAddresses in the exception
throw new ConnectionException(failedAddresses);
}
}
socketClosed = false;
initConnection();
}
/**
* Initializes the connection by creating a packet reader and writer and opening a
* XMPP stream to the server.
*
* @throws XMPPException if establishing a connection to the server fails.
* @throws SmackException if the server failes to respond back or if there is anther error.
* @throws IOException
*/
private void initConnection() throws SmackException, IOException {
boolean isFirstInitialization = packetReader == null || packetWriter == null;
compressionHandler = null;
serverAckdCompression = false;
// Set the reader and writer instance variables
initReaderAndWriter();
try {
if (isFirstInitialization) {
packetWriter = new PacketWriter();
packetReader = new PacketReader();
// If debugging is enabled, we should start the thread that will listen for
// all packets and then log them.
if (config.isDebuggerEnabled()) {
addPacketListener(debugger.getReaderListener(), null);
if (debugger.getWriterListener() != null) {
addPacketSendingListener(debugger.getWriterListener(), null);
}
}
}
else {
packetWriter.init();
packetReader.init();
}
// Start the packet writer. This will open a XMPP stream to the server
packetWriter.startup();
// Start the packet reader. The startup() method will block until we
// get an opening stream packet back from server.
packetReader.startup();
// Make note of the fact that we're now connected.
connected = true;
if (isFirstInitialization) {
// Notify listeners that a new connection has been established
for (ConnectionCreationListener listener : getConnectionCreationListeners()) {
listener.connectionCreated(this);
}
}
}
catch (SmackException ex) {
// An exception occurred in setting up the connection.
shutdown();
// Everything stoppped. Now throw the exception.
throw ex;
}
}
private void initReaderAndWriter() throws IOException {
try {
if (compressionHandler == null) {
reader =
new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
writer = new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream(), "UTF-8"));
}
else {
try {
OutputStream os = compressionHandler.getOutputStream(socket.getOutputStream());
writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
InputStream is = compressionHandler.getInputStream(socket.getInputStream());
reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
}
catch (Exception e) {
LOGGER.log(Level.WARNING, "initReaderAndWriter()", e);
compressionHandler = null;
reader = new BufferedReader(
new InputStreamReader(socket.getInputStream(), "UTF-8"));
writer = new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream(), "UTF-8"));
}
}
}
catch (UnsupportedEncodingException ioe) {
throw new IllegalStateException(ioe);
}
// If debugging is enabled, we open a window and write out all network traffic.
initDebugger();
}
/***********************************************
* TLS code below
**********************************************/
/**
* Notification message saying that the server supports TLS so confirm the server that we
* want to secure the connection.
*
* @param required true when the server indicates that TLS is required.
* @throws IOException if an exception occurs.
*/
private void startTLSReceived(boolean required) throws IOException {
if (required && config.getSecurityMode() ==
ConnectionConfiguration.SecurityMode.disabled) {
notifyConnectionError(new IllegalStateException(
"TLS required by server but not allowed by connection configuration"));
return;
}
if (config.getSecurityMode() == ConnectionConfiguration.SecurityMode.disabled) {
// Do not secure the connection using TLS since TLS was disabled
return;
}
writer.write("<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/>");
writer.flush();
}
/**
* The server has indicated that TLS negotiation can start. We now need to secure the
* existing plain connection and perform a handshake. This method won't return until the
* connection has finished the handshake or an error occurred while securing the connection.
* @throws IOException
* @throws CertificateException
* @throws NoSuchAlgorithmException
* @throws NoSuchProviderException
* @throws KeyStoreException
* @throws UnrecoverableKeyException
* @throws KeyManagementException
* @throws SecurityNotPossibleException
*
* @throws Exception if an exception occurs.
*/
private void proceedTLSReceived() throws NoSuchAlgorithmException, CertificateException, IOException, KeyStoreException, NoSuchProviderException, UnrecoverableKeyException, KeyManagementException, SecurityNotPossibleException {
SSLContext context = this.config.getCustomSSLContext();
KeyStore ks = null;
KeyManager[] kms = null;
PasswordCallback pcb = null;
if(config.getCallbackHandler() == null) {
ks = null;
} else if (context == null) {
if(config.getKeystoreType().equals("NONE")) {
ks = null;
pcb = null;
}
else if(config.getKeystoreType().equals("PKCS11")) {
try {
Constructor<?> c = Class.forName("sun.security.pkcs11.SunPKCS11").getConstructor(InputStream.class);
String pkcs11Config = "name = SmartCard\nlibrary = "+config.getPKCS11Library();
ByteArrayInputStream config = new ByteArrayInputStream(pkcs11Config.getBytes());
Provider p = (Provider)c.newInstance(config);
Security.addProvider(p);
ks = KeyStore.getInstance("PKCS11",p);
pcb = new PasswordCallback("PKCS11 Password: ",false);
this.config.getCallbackHandler().handle(new Callback[]{pcb});
ks.load(null,pcb.getPassword());
}
catch (Exception e) {
ks = null;
pcb = null;
}
}
else if(config.getKeystoreType().equals("Apple")) {
ks = KeyStore.getInstance("KeychainStore","Apple");
ks.load(null,null);
//pcb = new PasswordCallback("Apple Keychain",false);
//pcb.setPassword(null);
}
else {
ks = KeyStore.getInstance(config.getKeystoreType());
try {
pcb = new PasswordCallback("Keystore Password: ",false);
config.getCallbackHandler().handle(new Callback[]{pcb});
ks.load(new FileInputStream(config.getKeystorePath()), pcb.getPassword());
}
catch(Exception e) {
ks = null;
pcb = null;
}
}
KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
try {
if(pcb == null) {
kmf.init(ks,null);
} else {
kmf.init(ks,pcb.getPassword());
pcb.clearPassword();
}
kms = kmf.getKeyManagers();
} catch (NullPointerException npe) {
kms = null;
}
}
// If the user didn't specify a SSLContext, use the default one
if (context == null) {
context = SSLContext.getInstance("TLS");
context.init(kms, null, new java.security.SecureRandom());
}
Socket plain = socket;
// Secure the plain connection
socket = context.getSocketFactory().createSocket(plain,
plain.getInetAddress().getHostAddress(), plain.getPort(), true);
// Initialize the reader and writer with the new secured version
initReaderAndWriter();
final SSLSocket sslSocket = (SSLSocket) socket;
TLSUtils.setEnabledProtocolsAndCiphers(sslSocket, config.getEnabledSSLProtocols(), config.getEnabledSSLCiphers());
// Proceed to do the handshake
sslSocket.startHandshake();
final HostnameVerifier verifier = getConfiguration().getHostnameVerifier();
if (verifier != null && !verifier.verify(getServiceName(), sslSocket.getSession())) {
throw new CertificateException("Hostname verification of certificate failed. Certificate does not authenticate " + getServiceName());
}
//if (((SSLSocket) socket).getWantClientAuth()) {
// System.err.println("XMPPConnection wants client auth");
//}
//else if (((SSLSocket) socket).getNeedClientAuth()) {
// System.err.println("XMPPConnection needs client auth");
//}
//else {
// System.err.println("XMPPConnection does not require client auth");
// }
// Set that TLS was successful
usingTLS = true;
// Set the new writer to use
packetWriter.setWriter(writer);
// Send a new opening stream to the server
packetWriter.openStream();
}
/**
* Sets the available stream compression methods offered by the server.
*
* @param methods compression methods offered by the server.
*/
private void setAvailableCompressionMethods(Collection<String> methods) {
compressionMethods = methods;
}
/**
* Returns the compression handler that can be used for one compression methods offered by the server.
*
* @return a instance of XMPPInputOutputStream or null if no suitable instance was found
*
*/
private XMPPInputOutputStream maybeGetCompressionHandler() {
if (compressionMethods != null) {
for (XMPPInputOutputStream handler : SmackConfiguration.getCompresionHandlers()) {
String method = handler.getCompressionMethod();
if (compressionMethods.contains(method))
return handler;
}
}
return null;
}
@Override
public boolean isUsingCompression() {
return compressionHandler != null && serverAckdCompression;
}
/**
* Starts using stream compression that will compress network traffic. Traffic can be
* reduced up to 90%. Therefore, stream compression is ideal when using a slow speed network
* connection. However, the server and the client will need to use more CPU time in order to
* un/compress network data so under high load the server performance might be affected.
* <p>
* <p>
* Stream compression has to have been previously offered by the server. Currently only the
* zlib method is supported by the client. Stream compression negotiation has to be done
* before authentication took place.<p>
* <p>
*
* @return true if stream compression negotiation was successful.
* @throws IOException if the compress stanza could not be send
*/
private boolean useCompression() throws IOException {
// If stream compression was offered by the server and we want to use
// compression then send compression request to the server
if (authenticated) {
throw new IllegalStateException("Compression should be negotiated before authentication.");
}
if ((compressionHandler = maybeGetCompressionHandler()) != null) {
synchronized (compressionLock) {
requestStreamCompression(compressionHandler.getCompressionMethod());
// Wait until compression is being used or a timeout happened
try {
compressionLock.wait(getPacketReplyTimeout());
}
catch (InterruptedException e) {
// Ignore.
}
}
return isUsingCompression();
}
return false;
}
/**
* Request the server that we want to start using stream compression. When using TLS
* then negotiation of stream compression can only happen after TLS was negotiated. If TLS
* compression is being used the stream compression should not be used.
* @throws IOException if the compress stanza could not be send
*/
private void requestStreamCompression(String method) throws IOException {
writer.write("<compress xmlns='http://jabber.org/protocol/compress'>");
writer.write("<method>" + method + "</method></compress>");
writer.flush();
}
/**
* Start using stream compression since the server has acknowledged stream compression.
*
* @throws IOException if there is an exception starting stream compression.
*/
private void startStreamCompression() throws IOException {
serverAckdCompression = true;
// Initialize the reader and writer with the new secured version
initReaderAndWriter();
// Set the new writer to use
packetWriter.setWriter(writer);
// Send a new opening stream to the server
packetWriter.openStream();
// Notify that compression is being used
streamCompressionNegotiationDone();
}
/**
* Notifies the XMPP connection that stream compression negotiation is done so that the
* connection process can proceed.
*/
private void streamCompressionNegotiationDone() {
synchronized (compressionLock) {
compressionLock.notify();
}
}
/**
* Establishes a connection to the XMPP server and performs an automatic login
* only if the previous connection state was logged (authenticated). It basically
* creates and maintains a socket connection to the server.<p>
* <p/>
* Listeners will be preserved from a previous connection if the reconnection
* occurs after an abrupt termination.
*
* @throws XMPPException if an error occurs while trying to establish the connection.
* @throws SmackException
* @throws IOException
*/
@Override
protected void connectInternal() throws SmackException, IOException, XMPPException {
// Establishes the connection, readers and writers
connectUsingConfiguration(config);
// TODO is there a case where connectUsing.. does not throw an exception but connected is
// still false?
if (connected) {
callConnectionConnectedListener();
}
// Automatically makes the login if the user was previously connected successfully
// to the server and the connection was terminated abruptly
if (connected && wasAuthenticated) {
// Make the login
if (isAnonymous()) {
// Make the anonymous login
loginAnonymously();
}
else {
login(config.getUsername(), config.getPassword(), config.getResource());
}
notifyReconnection();
}
}
/**
* Sends out a notification that there was an error with the connection
* and closes the connection. Also prints the stack trace of the given exception
*
* @param e the exception that causes the connection close event.
*/
private synchronized void notifyConnectionError(Exception e) {
// Listeners were already notified of the exception, return right here.
if ((packetReader == null || packetReader.done) &&
(packetWriter == null || packetWriter.done)) return;
// Closes the connection temporary. A reconnection is possible
shutdown();
// Notify connection listeners of the error.
callConnectionClosedOnErrorListener(e);
}
/**
* Sends a notification indicating that the connection was reconnected successfully.
*/
private void notifyReconnection() {
// Notify connection listeners of the reconnection.
for (ConnectionListener listener : getConnectionListeners()) {
try {
listener.reconnectionSuccessful();
}
catch (Exception e) {
// Catch and print any exception so we can recover
// from a faulty listener
LOGGER.log(Level.WARNING, "notifyReconnection()", e);
}
}
}
protected class PacketReader {
private Thread readerThread;
private XmlPullParser parser;
/**
* Set to true if the last features stanza from the server has been parsed. A XMPP connection
* handshake can invoke multiple features stanzas, e.g. when TLS is activated a second feature
* stanza is send by the server. This is set to true once the last feature stanza has been
* parsed.
*/
private volatile boolean lastFeaturesParsed;
private volatile boolean done;
PacketReader() throws SmackException {
this.init();
}
/**
* Initializes the reader in order to be used. The reader is initialized during the
* first connection and when reconnecting due to an abruptly disconnection.
*
* @throws SmackException if the parser could not be reset.
*/
void init() throws SmackException {
done = false;
lastFeaturesParsed = false;
readerThread = new Thread() {
public void run() {
parsePackets(this);
}
};
readerThread.setName("Smack Packet Reader (" + getConnectionCounter() + ")");
readerThread.setDaemon(true);
resetParser();
}
/**
* Starts the packet reader thread and returns once a connection to the server
* has been established or if the server's features could not be parsed within
* the connection's PacketReplyTimeout.
*
* @throws IOException
* @throws SmackException
*/
synchronized void startup() throws IOException, SmackException {
readerThread.start();
try {
// Wait until either:
// - the servers last features stanza has been parsed
// - an exception is thrown while parsing
// - the timeout occurs
wait(getPacketReplyTimeout());
}
catch (InterruptedException ie) {
// Ignore.
}
if (!lastFeaturesParsed) {
throwConnectionExceptionOrNoResponse();
}
}
/**
* Shuts the packet reader down. This method simply sets the 'done' flag to true.
*/
void shutdown() {
done = true;
}
/**
* Resets the parser using the latest connection's reader. Reseting the parser is necessary
* when the plain connection has been secured or when a new opening stream element is going
* to be sent by the server.
*
* @throws SmackException if the parser could not be reset.
*/
private void resetParser() throws SmackException {
try {
parser = XmlPullParserFactory.newInstance().newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
parser.setInput(getReader());
}
catch (XmlPullParserException e) {
throw new SmackException(e);
}
}
/**
* Parse top-level packets in order to process them further.
*
* @param thread the thread that is being used by the reader to parse incoming packets.
*/
private void parsePackets(Thread thread) {
try {
int eventType = parser.getEventType();
do {
if (eventType == XmlPullParser.START_TAG) {
int parserDepth = parser.getDepth();
String name = parser.getName();
ParsingExceptionCallback callback = getParsingExceptionCallback();
Packet packet;
try {
packet = PacketParserUtils.parseStanza(parser, XMPPTCPConnection.this);
} catch (Exception e) {
CharSequence content = PacketParserUtils.parseContentDepth(parser, parserDepth);
UnparsablePacket message = new UnparsablePacket(content, e);
if (callback != null) {
callback.handleUnparsablePacket(message);
}
continue;
}
if (packet != null) {
processPacket(packet);
}
// We found an opening stream. Record information about it, then notify