1package eu.siacs.conversations.xmpp;
   2
   3import android.graphics.Bitmap;
   4import android.graphics.BitmapFactory;
   5import android.os.Bundle;
   6import android.os.Parcelable;
   7import android.os.PowerManager;
   8import android.os.PowerManager.WakeLock;
   9import android.os.SystemClock;
  10import android.security.KeyChain;
  11import android.util.Base64;
  12import android.util.Log;
  13import android.util.Pair;
  14import android.util.SparseArray;
  15
  16import org.xmlpull.v1.XmlPullParserException;
  17
  18import java.io.ByteArrayInputStream;
  19import java.io.IOException;
  20import java.io.InputStream;
  21import java.math.BigInteger;
  22import java.net.ConnectException;
  23import java.net.IDN;
  24import java.net.InetAddress;
  25import java.net.InetSocketAddress;
  26import java.net.Socket;
  27import java.net.URL;
  28import java.net.UnknownHostException;
  29import java.security.KeyManagementException;
  30import java.security.NoSuchAlgorithmException;
  31import java.security.Principal;
  32import java.security.PrivateKey;
  33import java.security.cert.X509Certificate;
  34import java.util.ArrayList;
  35import java.util.Arrays;
  36import java.util.HashMap;
  37import java.util.Hashtable;
  38import java.util.Iterator;
  39import java.util.List;
  40import java.util.Map.Entry;
  41import java.util.concurrent.atomic.AtomicBoolean;
  42import java.util.concurrent.atomic.AtomicInteger;
  43
  44import javax.net.ssl.HostnameVerifier;
  45import javax.net.ssl.KeyManager;
  46import javax.net.ssl.SSLContext;
  47import javax.net.ssl.SSLSession;
  48import javax.net.ssl.SSLSocket;
  49import javax.net.ssl.SSLSocketFactory;
  50import javax.net.ssl.X509KeyManager;
  51import javax.net.ssl.X509TrustManager;
  52
  53import de.duenndns.ssl.MemorizingTrustManager;
  54import eu.siacs.conversations.Config;
  55import eu.siacs.conversations.crypto.XmppDomainVerifier;
  56import eu.siacs.conversations.crypto.sasl.Anonymous;
  57import eu.siacs.conversations.crypto.sasl.DigestMd5;
  58import eu.siacs.conversations.crypto.sasl.External;
  59import eu.siacs.conversations.crypto.sasl.Plain;
  60import eu.siacs.conversations.crypto.sasl.SaslMechanism;
  61import eu.siacs.conversations.crypto.sasl.ScramSha1;
  62import eu.siacs.conversations.crypto.sasl.ScramSha256;
  63import eu.siacs.conversations.entities.Account;
  64import eu.siacs.conversations.entities.Message;
  65import eu.siacs.conversations.entities.ServiceDiscoveryResult;
  66import eu.siacs.conversations.generator.IqGenerator;
  67import eu.siacs.conversations.services.XmppConnectionService;
  68import eu.siacs.conversations.utils.DNSHelper;
  69import eu.siacs.conversations.utils.SSLSocketHelper;
  70import eu.siacs.conversations.utils.SocksSocketFactory;
  71import eu.siacs.conversations.xml.Element;
  72import eu.siacs.conversations.xml.Tag;
  73import eu.siacs.conversations.xml.TagWriter;
  74import eu.siacs.conversations.xml.XmlReader;
  75import eu.siacs.conversations.xml.Namespace;
  76import eu.siacs.conversations.xmpp.forms.Data;
  77import eu.siacs.conversations.xmpp.forms.Field;
  78import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  79import eu.siacs.conversations.xmpp.jid.Jid;
  80import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
  81import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
  82import eu.siacs.conversations.xmpp.stanzas.AbstractAcknowledgeableStanza;
  83import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
  84import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  85import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  86import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
  87import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
  88import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
  89import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
  90import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
  91import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
  92import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
  93
  94public class XmppConnection implements Runnable {
  95
  96	private static final int PACKET_IQ = 0;
  97	private static final int PACKET_MESSAGE = 1;
  98	private static final int PACKET_PRESENCE = 2;
  99	protected final Account account;
 100	private final WakeLock wakeLock;
 101	private Socket socket;
 102	private XmlReader tagReader;
 103	private TagWriter tagWriter = new TagWriter();
 104	private final Features features = new Features(this);
 105	private boolean needsBinding = true;
 106	private boolean shouldAuthenticate = true;
 107	private Element streamFeatures;
 108	private final HashMap<Jid, ServiceDiscoveryResult> disco = new HashMap<>();
 109
 110	private String streamId = null;
 111	private int smVersion = 3;
 112	private final SparseArray<AbstractAcknowledgeableStanza> mStanzaQueue = new SparseArray<>();
 113
 114	private int stanzasReceived = 0;
 115	private int stanzasSent = 0;
 116	private long lastPacketReceived = 0;
 117	private long lastPingSent = 0;
 118	private long lastConnect = 0;
 119	private long lastSessionStarted = 0;
 120	private long lastDiscoStarted = 0;
 121	private AtomicInteger mPendingServiceDiscoveries = new AtomicInteger(0);
 122	private AtomicBoolean mWaitForDisco = new AtomicBoolean(true);
 123	private AtomicBoolean mWaitingForSmCatchup = new AtomicBoolean(false);
 124	private AtomicInteger mSmCatchupMessageCounter = new AtomicInteger(0);
 125	private boolean mInteractive = false;
 126	private int attempt = 0;
 127	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 128	private OnPresencePacketReceived presenceListener = null;
 129	private OnJinglePacketReceived jingleListener = null;
 130	private OnIqPacketReceived unregisteredIqListener = null;
 131	private OnMessagePacketReceived messageListener = null;
 132	private OnStatusChanged statusListener = null;
 133	private OnBindListener bindListener = null;
 134	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 135	private OnMessageAcknowledged acknowledgedListener = null;
 136	private final XmppConnectionService mXmppConnectionService;
 137
 138	private SaslMechanism saslMechanism;
 139
 140	private class MyKeyManager implements X509KeyManager {
 141		@Override
 142		public String chooseClientAlias(String[] strings, Principal[] principals, Socket socket) {
 143			return account.getPrivateKeyAlias();
 144		}
 145
 146		@Override
 147		public String chooseServerAlias(String s, Principal[] principals, Socket socket) {
 148			return null;
 149		}
 150
 151		@Override
 152		public X509Certificate[] getCertificateChain(String alias) {
 153			Log.d(Config.LOGTAG,"getting certificate chain");
 154			try {
 155				return KeyChain.getCertificateChain(mXmppConnectionService, alias);
 156			} catch (Exception e) {
 157				Log.d(Config.LOGTAG,e.getMessage());
 158				return new X509Certificate[0];
 159			}
 160		}
 161
 162		@Override
 163		public String[] getClientAliases(String s, Principal[] principals) {
 164			final String alias = account.getPrivateKeyAlias();
 165			return alias != null ? new String[]{alias} : new String[0];
 166		}
 167
 168		@Override
 169		public String[] getServerAliases(String s, Principal[] principals) {
 170			return new String[0];
 171		}
 172
 173		@Override
 174		public PrivateKey getPrivateKey(String alias) {
 175			try {
 176				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 177			} catch (Exception e) {
 178				return null;
 179			}
 180		}
 181	}
 182
 183	public final OnIqPacketReceived registrationResponseListener =  new OnIqPacketReceived() {
 184		@Override
 185		public void onIqPacketReceived(Account account, IqPacket packet) {
 186			if (packet.getType() == IqPacket.TYPE.RESULT) {
 187				account.setOption(Account.OPTION_REGISTER, false);
 188				forceCloseSocket();
 189				changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 190			} else {
 191				final List<String> PASSWORD_TOO_WEAK_MSGS = Arrays.asList(
 192						"The password is too weak",
 193						"Please use a longer password.");
 194				Element error = packet.findChild("error");
 195				Account.State state = Account.State.REGISTRATION_FAILED;
 196				if (error != null) {
 197					if (error.hasChild("conflict")) {
 198						state = Account.State.REGISTRATION_CONFLICT;
 199					} else if (error.hasChild("resource-constraint")
 200							&& "wait".equals(error.getAttribute("type"))) {
 201						state = Account.State.REGISTRATION_PLEASE_WAIT;
 202					} else if (error.hasChild("not-acceptable")
 203							&& PASSWORD_TOO_WEAK_MSGS.contains(error.findChildContent("text"))) {
 204						state = Account.State.REGISTRATION_PASSWORD_TOO_WEAK;
 205					}
 206				}
 207				changeStatus(state);
 208				forceCloseSocket();
 209			}
 210		}
 211	};
 212
 213	public XmppConnection(final Account account, final XmppConnectionService service) {
 214		this.account = account;
 215		this.wakeLock = service.getPowerManager().newWakeLock(
 216				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 217		mXmppConnectionService = service;
 218	}
 219
 220	protected synchronized void changeStatus(final Account.State nextStatus) {
 221		if (Thread.currentThread().isInterrupted()) {
 222			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not changing status to "+nextStatus+" because thread was interrupted");
 223			return;
 224		}
 225		if (account.getStatus() != nextStatus) {
 226			if ((nextStatus == Account.State.OFFLINE)
 227					&& (account.getStatus() != Account.State.CONNECTING)
 228					&& (account.getStatus() != Account.State.ONLINE)
 229					&& (account.getStatus() != Account.State.DISABLED)) {
 230				return;
 231					}
 232			if (nextStatus == Account.State.ONLINE) {
 233				this.attempt = 0;
 234			}
 235			account.setStatus(nextStatus);
 236			if (statusListener != null) {
 237				statusListener.onStatusChanged(account);
 238			}
 239		}
 240	}
 241
 242	public void prepareNewConnection() {
 243		this.lastConnect = SystemClock.elapsedRealtime();
 244		this.lastPingSent = SystemClock.elapsedRealtime();
 245		this.lastDiscoStarted = Long.MAX_VALUE;
 246		this.mWaitingForSmCatchup.set(false);
 247		this.changeStatus(Account.State.CONNECTING);
 248	}
 249
 250	public boolean isWaitingForSmCatchup() {
 251		return mWaitingForSmCatchup.get();
 252	}
 253
 254	public void incrementSmCatchupMessageCounter() {
 255		this.mSmCatchupMessageCounter.incrementAndGet();
 256	}
 257
 258	protected void connect() {
 259		if (mXmppConnectionService.areMessagesInitialized()) {
 260			mXmppConnectionService.resetSendingToWaiting(account);
 261		}
 262		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 263		features.encryptionEnabled = false;
 264		this.attempt++;
 265		try {
 266			Socket localSocket;
 267			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 268			this.changeStatus(Account.State.CONNECTING);
 269			final boolean useTor = mXmppConnectionService.useTorToConnect() || account.isOnion();
 270			final boolean extended = mXmppConnectionService.showExtendedConnectionOptions();
 271			if (useTor) {
 272				String destination;
 273				if (account.getHostname() == null || account.getHostname().isEmpty()) {
 274					destination = account.getServer().toString();
 275				} else {
 276					destination = account.getHostname();
 277				}
 278				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": connect to " + destination + " via Tor");
 279				localSocket = SocksSocketFactory.createSocketOverTor(destination, account.getPort());
 280				try {
 281					startXmpp(localSocket);
 282				} catch (InterruptedException e) {
 283					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 284					return;
 285				} catch (Exception e) {
 286					throw new IOException(e.getMessage());
 287				}
 288			} else if (extended && account.getHostname() != null && !account.getHostname().isEmpty()) {
 289
 290				InetSocketAddress address = new InetSocketAddress(account.getHostname(), account.getPort());
 291
 292				features.encryptionEnabled = account.getPort() == 5223;
 293
 294				try {
 295					if (features.encryptionEnabled) {
 296						try {
 297							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 298							localSocket = tlsFactoryVerifier.factory.createSocket();
 299							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 300							final SSLSession session = ((SSLSocket) localSocket).getSession();
 301							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), session)) {
 302								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 303								throw new StateChangingException(Account.State.TLS_ERROR);
 304							}
 305						} catch (KeyManagementException e) {
 306							features.encryptionEnabled = false;
 307							localSocket = new Socket();
 308						}
 309					} else {
 310						localSocket = new Socket();
 311						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 312					}
 313				} catch (IOException e) {
 314					throw new UnknownHostException();
 315				}
 316				try {
 317					startXmpp(localSocket);
 318				} catch (InterruptedException e) {
 319					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 320					return;
 321				} catch (Exception e) {
 322					throw new IOException(e.getMessage());
 323				}
 324			} else if (DNSHelper.isIp(account.getServer().toString())) {
 325				localSocket = new Socket();
 326				try {
 327					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 328				} catch (IOException e) {
 329					throw new UnknownHostException();
 330				}
 331				try {
 332					startXmpp(localSocket);
 333				} catch (InterruptedException e) {
 334					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 335					return;
 336				} catch (Exception e) {
 337					throw new IOException(e.getMessage());
 338				}
 339			} else {
 340				final Bundle result = DNSHelper.getSRVRecord(account.getServer(), mXmppConnectionService);
 341				final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
 342				for (Iterator<Parcelable> iterator = values.iterator(); iterator.hasNext(); ) {
 343					if (Thread.currentThread().isInterrupted()) {
 344						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 345						return;
 346					}
 347					final Bundle namePort = (Bundle) iterator.next();
 348					try {
 349						String srvRecordServer;
 350						try {
 351							srvRecordServer = IDN.toASCII(namePort.getString("name"));
 352						} catch (final IllegalArgumentException e) {
 353							// TODO: Handle me?`
 354							srvRecordServer = "";
 355						}
 356						final int srvRecordPort = namePort.getInt("port");
 357						final String srvIpServer = namePort.getString("ip");
 358						// if tls is true, encryption is implied and must not be started
 359						features.encryptionEnabled = namePort.getBoolean("tls");
 360						final InetSocketAddress addr;
 361						if (srvIpServer != null) {
 362							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
 363							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 364									+ ": using values from dns " + srvRecordServer
 365									+ "[" + srvIpServer + "]:" + srvRecordPort + " tls: " + features.encryptionEnabled);
 366						} else {
 367							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
 368							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 369									+ ": using values from dns "
 370									+ srvRecordServer + ":" + srvRecordPort + " tls: " + features.encryptionEnabled);
 371						}
 372
 373						if (!features.encryptionEnabled) {
 374							localSocket = new Socket();
 375							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 376						} else {
 377							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 378							localSocket = tlsFactoryVerifier.factory.createSocket();
 379
 380							if (localSocket == null) {
 381								throw new IOException("could not initialize ssl socket");
 382							}
 383
 384							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 385							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 386							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 387
 388							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 389
 390							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), ((SSLSocket) localSocket).getSession())) {
 391								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 392								throw new StateChangingException(Account.State.TLS_ERROR);
 393							}
 394						}
 395						if (startXmpp(localSocket)) {
 396							break; // successfully connected to server that speaks xmpp
 397						} else {
 398							localSocket.close();
 399						}
 400					} catch (final StateChangingException e) {
 401						throw e;
 402					} catch (InterruptedException e) {
 403						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 404						return;
 405					} catch (final Throwable e) {
 406						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 407						if (!iterator.hasNext()) {
 408							throw new UnknownHostException();
 409						}
 410					}
 411				}
 412			}
 413			processStream();
 414		}  catch (final SecurityException e) {
 415			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 416		} catch(final StateChangingException e) {
 417			this.changeStatus(e.state);
 418		} catch (final UnknownHostException | ConnectException e) {
 419			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 420		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 421			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 422		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 423			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 424			this.changeStatus(Account.State.OFFLINE);
 425			this.attempt = Math.max(0, this.attempt - 1);
 426		} finally {
 427			if (!Thread.currentThread().isInterrupted()) {
 428				forceCloseSocket();
 429				if (wakeLock.isHeld()) {
 430					try {
 431						wakeLock.release();
 432					} catch (final RuntimeException ignored) {
 433					}
 434				}
 435			} else {
 436				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock because thread was interrupted");
 437			}
 438		}
 439	}
 440
 441	/**
 442	 * Starts xmpp protocol, call after connecting to socket
 443	 * @return true if server returns with valid xmpp, false otherwise
 444     */
 445	private boolean startXmpp(Socket socket) throws Exception {
 446		if (Thread.currentThread().isInterrupted()) {
 447			throw new InterruptedException();
 448		}
 449		this.socket = socket;
 450		tagReader = new XmlReader(wakeLock);
 451		if (tagWriter != null) {
 452			tagWriter.forceClose();
 453		}
 454		tagWriter = new TagWriter();
 455		tagWriter.setOutputStream(socket.getOutputStream());
 456		tagReader.setInputStream(socket.getInputStream());
 457		tagWriter.beginDocument();
 458		sendStartStream();
 459		final Tag tag = tagReader.readTag();
 460		return tag != null && tag.isStart("stream");
 461	}
 462
 463	private static class TlsFactoryVerifier {
 464		private final SSLSocketFactory factory;
 465		private final HostnameVerifier verifier;
 466
 467		public TlsFactoryVerifier(final SSLSocketFactory factory, final HostnameVerifier verifier) throws IOException {
 468			this.factory = factory;
 469			this.verifier = verifier;
 470			if (factory == null || verifier == null) {
 471				throw new IOException("could not setup ssl");
 472			}
 473		}
 474	}
 475
 476	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 477		final SSLContext sc = SSLSocketHelper.getSSLContext();
 478		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 479		KeyManager[] keyManager;
 480		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 481			keyManager = new KeyManager[]{new MyKeyManager()};
 482		} else {
 483			keyManager = null;
 484		}
 485		String domain = account.getJid().getDomainpart();
 486		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 487		final SSLSocketFactory factory = sc.getSocketFactory();
 488		final HostnameVerifier verifier;
 489		if (mInteractive) {
 490			verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier());
 491		} else {
 492			verifier = trustManager.wrapHostnameVerifierNonInteractive(new XmppDomainVerifier());
 493		}
 494
 495		return new TlsFactoryVerifier(factory, verifier);
 496	}
 497
 498	@Override
 499	public void run() {
 500		forceCloseSocket();
 501		connect();
 502	}
 503
 504	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 505		Tag nextTag = tagReader.readTag();
 506		while (nextTag != null && !nextTag.isEnd("stream")) {
 507			if (nextTag.isStart("error")) {
 508				processStreamError(nextTag);
 509			} else if (nextTag.isStart("features")) {
 510				processStreamFeatures(nextTag);
 511			} else if (nextTag.isStart("proceed")) {
 512				switchOverToTls(nextTag);
 513			} else if (nextTag.isStart("success")) {
 514				final String challenge = tagReader.readElement(nextTag).getContent();
 515				try {
 516					saslMechanism.getResponse(challenge);
 517				} catch (final SaslMechanism.AuthenticationException e) {
 518					Log.e(Config.LOGTAG, String.valueOf(e));
 519					throw new StateChangingException(Account.State.UNAUTHORIZED);
 520				}
 521				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 522				account.setKey(Account.PINNED_MECHANISM_KEY,
 523						String.valueOf(saslMechanism.getPriority()));
 524				tagReader.reset();
 525				sendStartStream();
 526				final Tag tag = tagReader.readTag();
 527				if (tag != null && tag.isStart("stream")) {
 528					processStream();
 529				} else {
 530					throw new IOException("server didn't restart stream after successful auth");
 531				}
 532				break;
 533			} else if (nextTag.isStart("failure")) {
 534				final Element failure = tagReader.readElement(nextTag);
 535				if (Namespace.SASL.equals(failure.getNamespace())) {
 536					final String text = failure.findChildContent("text");
 537					if (failure.hasChild("account-disabled")
 538							&& text != null
 539							&& text.contains("renew")
 540							&& Config.MAGIC_CREATE_DOMAIN != null
 541							&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 542						throw new StateChangingException(Account.State.PAYMENT_REQUIRED);
 543					} else {
 544						throw new StateChangingException(Account.State.UNAUTHORIZED);
 545					}
 546				} else if (Namespace.TLS.equals(failure.getNamespace())) {
 547					throw new StateChangingException(Account.State.TLS_ERROR);
 548				} else {
 549					throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 550				}
 551			} else if (nextTag.isStart("challenge")) {
 552				final String challenge = tagReader.readElement(nextTag).getContent();
 553				final Element response = new Element("response",Namespace.SASL);
 554				try {
 555					response.setContent(saslMechanism.getResponse(challenge));
 556				} catch (final SaslMechanism.AuthenticationException e) {
 557					// TODO: Send auth abort tag.
 558					Log.e(Config.LOGTAG, e.toString());
 559				}
 560				tagWriter.writeElement(response);
 561			} else if (nextTag.isStart("enabled")) {
 562				final Element enabled = tagReader.readElement(nextTag);
 563				if ("true".equals(enabled.getAttribute("resume"))) {
 564					this.streamId = enabled.getAttribute("id");
 565					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 566							+ ": stream management(" + smVersion
 567							+ ") enabled (resumable)");
 568				} else {
 569					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 570							+ ": stream management(" + smVersion + ") enabled");
 571				}
 572				this.stanzasReceived = 0;
 573				final RequestPacket r = new RequestPacket(smVersion);
 574				tagWriter.writeStanzaAsync(r);
 575			} else if (nextTag.isStart("resumed")) {
 576				this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 577				lastPacketReceived = SystemClock.elapsedRealtime();
 578				final Element resumed = tagReader.readElement(nextTag);
 579				final String h = resumed.getAttribute("h");
 580				try {
 581					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 582					synchronized (this.mStanzaQueue) {
 583						final int serverCount = Integer.parseInt(h);
 584						if (serverCount != stanzasSent) {
 585							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 586									+ ": session resumed with lost packages");
 587							stanzasSent = serverCount;
 588						} else {
 589							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 590						}
 591						acknowledgeStanzaUpTo(serverCount);
 592						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 593							failedStanzas.add(mStanzaQueue.valueAt(i));
 594						}
 595						mStanzaQueue.clear();
 596					}
 597					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 598					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 599						if (packet instanceof MessagePacket) {
 600							MessagePacket message = (MessagePacket) packet;
 601							mXmppConnectionService.markMessage(account,
 602									message.getTo().toBareJid(),
 603									message.getId(),
 604									Message.STATUS_UNSEND);
 605						}
 606						sendPacket(packet);
 607					}
 608				} catch (final NumberFormatException ignored) {
 609				}
 610				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 611				changeStatus(Account.State.ONLINE);
 612			} else if (nextTag.isStart("r")) {
 613				tagReader.readElement(nextTag);
 614				if (Config.EXTENDED_SM_LOGGING) {
 615					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 616				}
 617				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 618				tagWriter.writeStanzaAsync(ack);
 619			} else if (nextTag.isStart("a")) {
 620				synchronized (account) {
 621					if (mWaitingForSmCatchup.compareAndSet(true, false)) {
 622						int count = mSmCatchupMessageCounter.get();
 623						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": SM catchup complete (" + count + ")");
 624						if (count > 0) {
 625							mXmppConnectionService.getNotificationService().finishBacklog(true, account);
 626						}
 627					}
 628				}
 629				final Element ack = tagReader.readElement(nextTag);
 630				lastPacketReceived = SystemClock.elapsedRealtime();
 631				try {
 632					synchronized (this.mStanzaQueue) {
 633						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 634						acknowledgeStanzaUpTo(serverSequence);
 635					}
 636				} catch (NumberFormatException | NullPointerException e) {
 637					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 638				}
 639			} else if (nextTag.isStart("failed")) {
 640				Element failed = tagReader.readElement(nextTag);
 641				try {
 642					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 643					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 644					synchronized (this.mStanzaQueue) {
 645						acknowledgeStanzaUpTo(serverCount);
 646					}
 647				} catch (NumberFormatException | NullPointerException e) {
 648					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 649				}
 650				resetStreamId();
 651				sendBindRequest();
 652			} else if (nextTag.isStart("iq")) {
 653				processIq(nextTag);
 654			} else if (nextTag.isStart("message")) {
 655				processMessage(nextTag);
 656			} else if (nextTag.isStart("presence")) {
 657				processPresence(nextTag);
 658			}
 659			nextTag = tagReader.readTag();
 660		}
 661	}
 662
 663	private void acknowledgeStanzaUpTo(int serverCount) {
 664		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 665			if (serverCount >= mStanzaQueue.keyAt(i)) {
 666				if (Config.EXTENDED_SM_LOGGING) {
 667					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 668				}
 669				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 670				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 671					MessagePacket packet = (MessagePacket) stanza;
 672					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 673				}
 674				mStanzaQueue.removeAt(i);
 675				i--;
 676			}
 677		}
 678	}
 679
 680	private Element processPacket(final Tag currentTag, final int packetType)
 681		throws XmlPullParserException, IOException {
 682		Element element;
 683		switch (packetType) {
 684			case PACKET_IQ:
 685				element = new IqPacket();
 686				break;
 687			case PACKET_MESSAGE:
 688				element = new MessagePacket();
 689				break;
 690			case PACKET_PRESENCE:
 691				element = new PresencePacket();
 692				break;
 693			default:
 694				return null;
 695		}
 696		element.setAttributes(currentTag.getAttributes());
 697		Tag nextTag = tagReader.readTag();
 698		if (nextTag == null) {
 699			throw new IOException("interrupted mid tag");
 700		}
 701		while (!nextTag.isEnd(element.getName())) {
 702			if (!nextTag.isNo()) {
 703				final Element child = tagReader.readElement(nextTag);
 704				final String type = currentTag.getAttribute("type");
 705				if (packetType == PACKET_IQ
 706						&& "jingle".equals(child.getName())
 707						&& ("set".equalsIgnoreCase(type) || "get"
 708							.equalsIgnoreCase(type))) {
 709					element = new JinglePacket();
 710					element.setAttributes(currentTag.getAttributes());
 711							}
 712				element.addChild(child);
 713			}
 714			nextTag = tagReader.readTag();
 715			if (nextTag == null) {
 716				throw new IOException("interrupted mid tag");
 717			}
 718		}
 719		if (stanzasReceived == Integer.MAX_VALUE) {
 720			resetStreamId();
 721			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 722		}
 723		++stanzasReceived;
 724		lastPacketReceived = SystemClock.elapsedRealtime();
 725		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 726			Log.d(Config.LOGTAG,"[background stanza] "+element);
 727		}
 728		return element;
 729	}
 730
 731	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 732		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 733
 734		if (packet.getId() == null) {
 735			return; // an iq packet without id is definitely invalid
 736		}
 737
 738		if (packet instanceof JinglePacket) {
 739			if (this.jingleListener != null) {
 740				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 741			}
 742		} else {
 743			OnIqPacketReceived callback = null;
 744			synchronized (this.packetCallbacks) {
 745				if (packetCallbacks.containsKey(packet.getId())) {
 746					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 747					// Packets to the server should have responses from the server
 748					if (packetCallbackDuple.first.toServer(account)) {
 749						if (packet.fromServer(account)) {
 750							callback = packetCallbackDuple.second;
 751							packetCallbacks.remove(packet.getId());
 752						} else {
 753							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 754						}
 755					} else {
 756						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 757							callback = packetCallbackDuple.second;
 758							packetCallbacks.remove(packet.getId());
 759						} else {
 760							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 761						}
 762					}
 763				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 764					callback = this.unregisteredIqListener;
 765				}
 766			}
 767			if (callback != null) {
 768				try {
 769					callback.onIqPacketReceived(account, packet);
 770				} catch (StateChangingError error) {
 771					throw new StateChangingException(error.state);
 772				}
 773			}
 774		}
 775	}
 776
 777	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 778		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 779		this.messageListener.onMessagePacketReceived(account, packet);
 780	}
 781
 782	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 783		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 784		this.presenceListener.onPresencePacketReceived(account, packet);
 785	}
 786
 787	private void sendStartTLS() throws IOException {
 788		final Tag startTLS = Tag.empty("starttls");
 789		startTLS.setAttribute("xmlns", Namespace.TLS);
 790		tagWriter.writeTag(startTLS);
 791	}
 792
 793
 794
 795	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 796		tagReader.readTag();
 797		try {
 798			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 799			final InetAddress address = socket == null ? null : socket.getInetAddress();
 800
 801			if (address == null) {
 802				throw new IOException("could not setup ssl");
 803			}
 804
 805			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 806
 807			if (sslSocket == null) {
 808				throw new IOException("could not initialize ssl socket");
 809			}
 810
 811			SSLSocketHelper.setSecurity(sslSocket);
 812
 813			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), sslSocket.getSession())) {
 814				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 815				throw new StateChangingException(Account.State.TLS_ERROR);
 816			}
 817			tagReader.setInputStream(sslSocket.getInputStream());
 818			tagWriter.setOutputStream(sslSocket.getOutputStream());
 819			sendStartStream();
 820			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 821			features.encryptionEnabled = true;
 822			final Tag tag = tagReader.readTag();
 823			if (tag != null && tag.isStart("stream")) {
 824				processStream();
 825			} else {
 826				throw new IOException("server didn't restart stream after STARTTLS");
 827			}
 828			sslSocket.close();
 829		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 830			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 831			throw new StateChangingException(Account.State.TLS_ERROR);
 832		}
 833	}
 834
 835	private void processStreamFeatures(final Tag currentTag)
 836		throws XmlPullParserException, IOException {
 837		this.streamFeatures = tagReader.readElement(currentTag);
 838		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 839			sendStartTLS();
 840		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 841			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 842				sendRegistryRequest();
 843			} else {
 844				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 845			}
 846		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 847			throw new StateChangingException(Account.State.REGISTRATION_NOT_SUPPORTED);
 848		} else if (this.streamFeatures.hasChild("mechanisms")
 849				&& shouldAuthenticate
 850				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 851			authenticate();
 852		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 853			if (Config.EXTENDED_SM_LOGGING) {
 854				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 855			}
 856			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 857			this.mSmCatchupMessageCounter.set(0);
 858			this.mWaitingForSmCatchup.set(true);
 859			this.tagWriter.writeStanzaAsync(resume);
 860		} else if (needsBinding) {
 861			if (this.streamFeatures.hasChild("bind")) {
 862				sendBindRequest();
 863			} else {
 864				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 865			}
 866		}
 867	}
 868
 869	private void authenticate() throws IOException {
 870		final List<String> mechanisms = extractMechanisms(streamFeatures
 871				.findChild("mechanisms"));
 872		final Element auth = new Element("auth",Namespace.SASL);
 873		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 874			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 875		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 876			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 877		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 878			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 879		} else if (mechanisms.contains("PLAIN")) {
 880			saslMechanism = new Plain(tagWriter, account);
 881		} else if (mechanisms.contains("DIGEST-MD5")) {
 882			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 883		} else if (mechanisms.contains("ANONYMOUS")) {
 884			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 885		}
 886		if (saslMechanism != null) {
 887			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 888			if (pinnedMechanism > saslMechanism.getPriority()) {
 889				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 890						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 891						") than pinned priority (" + pinnedMechanism +
 892						"). Possible downgrade attack?");
 893				throw new StateChangingException(Account.State.DOWNGRADE_ATTACK);
 894			}
 895			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 896			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 897			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 898				auth.setContent(saslMechanism.getClientFirstMessage());
 899			}
 900			tagWriter.writeElement(auth);
 901		} else {
 902			throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 903		}
 904	}
 905
 906	private List<String> extractMechanisms(final Element stream) {
 907		final ArrayList<String> mechanisms = new ArrayList<>(stream
 908				.getChildren().size());
 909		for (final Element child : stream.getChildren()) {
 910			mechanisms.add(child.getContent());
 911		}
 912		return mechanisms;
 913	}
 914
 915	private void sendRegistryRequest() {
 916		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 917		register.query("jabber:iq:register");
 918		register.setTo(account.getServer());
 919		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 920
 921			@Override
 922			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 923				boolean failed = false;
 924				if (packet.getType() == IqPacket.TYPE.RESULT
 925						&& packet.query().hasChild("username")
 926						&& (packet.query().hasChild("password"))) {
 927					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 928					final Element username = new Element("username").setContent(account.getUsername());
 929					final Element password = new Element("password").setContent(account.getPassword());
 930					register.query("jabber:iq:register").addChild(username);
 931					register.query().addChild(password);
 932					register.setFrom(account.getJid().toBareJid());
 933					sendUnmodifiedIqPacket(register, registrationResponseListener);
 934				} else if (packet.getType() == IqPacket.TYPE.RESULT
 935						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 936					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 937					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 938					final String id = packet.getId();
 939
 940					Bitmap captcha = null;
 941					if (blob != null) {
 942						try {
 943							final String base64Blob = blob.getContent();
 944							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 945							InputStream stream = new ByteArrayInputStream(strBlob);
 946							captcha = BitmapFactory.decodeStream(stream);
 947						} catch (Exception e) {
 948							//ignored
 949						}
 950					} else {
 951						try {
 952							Field url = data.getFieldByName("url");
 953							String urlString = url.findChildContent("value");
 954							URL uri = new URL(urlString);
 955							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 956						} catch (IOException e) {
 957							Log.e(Config.LOGTAG, e.toString());
 958						}
 959					}
 960
 961					if (captcha != null) {
 962						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 963					}
 964				} else {
 965					failed = true;
 966				}
 967
 968				if (failed) {
 969					final Element instructions = packet.query().findChild("instructions");
 970					setAccountCreationFailed((instructions != null) ? instructions.getContent() : "");
 971				}
 972			}
 973		});
 974	}
 975
 976	private void setAccountCreationFailed(String instructions) {
 977		changeStatus(Account.State.REGISTRATION_FAILED);
 978		disconnect(true);
 979		Log.d(Config.LOGTAG, account.getJid().toBareJid()
 980				+ ": could not register. instructions are"
 981				+ instructions);
 982	}
 983
 984	public void resetEverything() {
 985		resetAttemptCount(true);
 986		resetStreamId();
 987		clearIqCallbacks();
 988		mStanzaQueue.clear();
 989		synchronized (this.disco) {
 990			disco.clear();
 991		}
 992	}
 993
 994	private void sendBindRequest() {
 995		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
 996			try {
 997				Thread.sleep(500);
 998			} catch (final InterruptedException ignored) {
 999			}
1000		}
1001		needsBinding = false;
1002		clearIqCallbacks();
1003		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1004		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1005				.addChild("resource").setContent(account.getResource());
1006		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1007			@Override
1008			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1009				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1010					return;
1011				}
1012				final Element bind = packet.findChild("bind");
1013				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1014					final Element jid = bind.findChild("jid");
1015					if (jid != null && jid.getContent() != null) {
1016						try {
1017							if (account.setJid(Jid.fromString(jid.getContent()))) {
1018								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1019								mXmppConnectionService.databaseBackend.updateAccount(account);
1020							}
1021							if (streamFeatures.hasChild("session")
1022									&& !streamFeatures.findChild("session").hasChild("optional")) {
1023								sendStartSession();
1024							} else {
1025								sendPostBindInitialization();
1026							}
1027							return;
1028						} catch (final InvalidJidException e) {
1029							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1030						}
1031					} else {
1032						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1033					}
1034				} else {
1035					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1036				}
1037				account.setResource(account.getResource().split("\\.")[0]);
1038				throw new StateChangingError(Account.State.BIND_FAILURE);
1039			}
1040		});
1041	}
1042
1043	private void clearIqCallbacks() {
1044		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1045		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1046		synchronized (this.packetCallbacks) {
1047			if (this.packetCallbacks.size() == 0) {
1048				return;
1049			}
1050			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1051			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1052			while (iterator.hasNext()) {
1053				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1054				callbacks.add(entry.second);
1055				iterator.remove();
1056			}
1057		}
1058		for(OnIqPacketReceived callback : callbacks) {
1059			callback.onIqPacketReceived(account,failurePacket);
1060		}
1061		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1062	}
1063
1064	public void sendDiscoTimeout() {
1065		if (mWaitForDisco.compareAndSet(true, false)) {
1066			finalizeBind();
1067		}
1068	}
1069
1070	private void sendStartSession() {
1071		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1072		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1073		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1074		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1075			@Override
1076			public void onIqPacketReceived(Account account, IqPacket packet) {
1077				if (packet.getType() == IqPacket.TYPE.RESULT) {
1078					sendPostBindInitialization();
1079				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1080					throw new StateChangingError(Account.State.SESSION_FAILURE);
1081				}
1082			}
1083		});
1084	}
1085
1086	private void sendPostBindInitialization() {
1087		smVersion = 0;
1088		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1089			smVersion = 3;
1090		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1091			smVersion = 2;
1092		}
1093		if (smVersion != 0) {
1094			synchronized (this.mStanzaQueue) {
1095				final EnablePacket enable = new EnablePacket(smVersion);
1096				tagWriter.writeStanzaAsync(enable);
1097				stanzasSent = 0;
1098				mStanzaQueue.clear();
1099			}
1100		}
1101		features.carbonsEnabled = false;
1102		features.blockListRequested = false;
1103		synchronized (this.disco) {
1104			this.disco.clear();
1105		}
1106		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1107		mPendingServiceDiscoveries.set(0);
1108		if (smVersion == 0 || Patches.DISCO_EXCEPTIONS.contains(account.getJid().getDomainpart())) {
1109			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": do not wait for service discovery");
1110			mWaitForDisco.set(false);
1111		} else {
1112			mWaitForDisco.set(true);
1113		}
1114		lastDiscoStarted = SystemClock.elapsedRealtime();
1115		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1116		Element caps = streamFeatures.findChild("c");
1117		final String hash = caps == null ? null : caps.getAttribute("hash");
1118		final String ver = caps == null ? null : caps.getAttribute("ver");
1119		ServiceDiscoveryResult discoveryResult = null;
1120		if (hash != null && ver != null) {
1121			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1122		}
1123		if (discoveryResult == null) {
1124			sendServiceDiscoveryInfo(account.getServer());
1125		} else {
1126			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1127			disco.put(account.getServer(), discoveryResult);
1128		}
1129		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1130		sendServiceDiscoveryItems(account.getServer());
1131
1132		if (!mWaitForDisco.get()) {
1133			finalizeBind();
1134		}
1135		this.lastSessionStarted = SystemClock.elapsedRealtime();
1136	}
1137
1138	private void sendServiceDiscoveryInfo(final Jid jid) {
1139		mPendingServiceDiscoveries.incrementAndGet();
1140		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1141		iq.setTo(jid);
1142		iq.query("http://jabber.org/protocol/disco#info");
1143		this.sendIqPacket(iq, new OnIqPacketReceived() {
1144
1145			@Override
1146			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1147				if (packet.getType() == IqPacket.TYPE.RESULT) {
1148					boolean advancedStreamFeaturesLoaded;
1149					synchronized (XmppConnection.this.disco) {
1150						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1151						if (jid.equals(account.getServer())) {
1152							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1153						}
1154						disco.put(jid, result);
1155						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1156								&& disco.containsKey(account.getJid().toBareJid());
1157					}
1158					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1159						enableAdvancedStreamFeatures();
1160					}
1161				} else {
1162					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1163				}
1164				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1165					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1166							&& mWaitForDisco.compareAndSet(true, false)) {
1167						finalizeBind();
1168					}
1169				}
1170			}
1171		});
1172	}
1173
1174	private void finalizeBind() {
1175		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1176		if (bindListener != null) {
1177			bindListener.onBind(account);
1178		}
1179		changeStatus(Account.State.ONLINE);
1180	}
1181
1182	private void enableAdvancedStreamFeatures() {
1183		if (getFeatures().carbons() && !features.carbonsEnabled) {
1184			sendEnableCarbons();
1185		}
1186		if (getFeatures().blocking() && !features.blockListRequested) {
1187			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1188			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1189		}
1190		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1191			listener.onAdvancedStreamFeaturesAvailable(account);
1192		}
1193	}
1194
1195	private void sendServiceDiscoveryItems(final Jid server) {
1196		mPendingServiceDiscoveries.incrementAndGet();
1197		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1198		iq.setTo(server.toDomainJid());
1199		iq.query("http://jabber.org/protocol/disco#items");
1200		this.sendIqPacket(iq, new OnIqPacketReceived() {
1201
1202			@Override
1203			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1204				if (packet.getType() == IqPacket.TYPE.RESULT) {
1205					final List<Element> elements = packet.query().getChildren();
1206					for (final Element element : elements) {
1207						if (element.getName().equals("item")) {
1208							final Jid jid = element.getAttributeAsJid("jid");
1209							if (jid != null && !jid.equals(account.getServer())) {
1210								sendServiceDiscoveryInfo(jid);
1211							}
1212						}
1213					}
1214				} else {
1215					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1216				}
1217				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1218					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1219							&& mWaitForDisco.compareAndSet(true, false)) {
1220						finalizeBind();
1221					}
1222				}
1223			}
1224		});
1225	}
1226
1227	private void sendEnableCarbons() {
1228		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1229		iq.addChild("enable", "urn:xmpp:carbons:2");
1230		this.sendIqPacket(iq, new OnIqPacketReceived() {
1231
1232			@Override
1233			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1234				if (!packet.hasChild("error")) {
1235					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1236							+ ": successfully enabled carbons");
1237					features.carbonsEnabled = true;
1238				} else {
1239					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1240							+ ": error enableing carbons " + packet.toString());
1241				}
1242			}
1243		});
1244	}
1245
1246	private void processStreamError(final Tag currentTag)
1247		throws XmlPullParserException, IOException {
1248		final Element streamError = tagReader.readElement(currentTag);
1249		if (streamError == null) {
1250			return;
1251		}
1252		if (streamError.hasChild("conflict")) {
1253			final String resource = account.getResource().split("\\.")[0];
1254			account.setResource(resource + "." + nextRandomId());
1255			Log.d(Config.LOGTAG,
1256					account.getJid().toBareJid() + ": switching resource due to conflict ("
1257					+ account.getResource() + ")");
1258			throw new IOException();
1259		} else if (streamError.hasChild("host-unknown")) {
1260			throw new StateChangingException(Account.State.HOST_UNKNOWN);
1261		} else if (streamError.hasChild("policy-violation")) {
1262			throw new StateChangingException(Account.State.POLICY_VIOLATION);
1263		} else {
1264			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1265			throw new StateChangingException(Account.State.STREAM_ERROR);
1266		}
1267	}
1268
1269	private void sendStartStream() throws IOException {
1270		final Tag stream = Tag.start("stream:stream");
1271		stream.setAttribute("to", account.getServer().toString());
1272		stream.setAttribute("version", "1.0");
1273		stream.setAttribute("xml:lang", "en");
1274		stream.setAttribute("xmlns", "jabber:client");
1275		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1276		tagWriter.writeTag(stream);
1277	}
1278
1279	private String nextRandomId() {
1280		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(36);
1281	}
1282
1283	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1284		packet.setFrom(account.getJid());
1285		return this.sendUnmodifiedIqPacket(packet, callback);
1286	}
1287
1288	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1289		if (packet.getId() == null) {
1290			final String id = nextRandomId();
1291			packet.setAttribute("id", id);
1292		}
1293		if (callback != null) {
1294			synchronized (this.packetCallbacks) {
1295				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1296			}
1297		}
1298		this.sendPacket(packet);
1299		return packet.getId();
1300	}
1301
1302	public void sendMessagePacket(final MessagePacket packet) {
1303		this.sendPacket(packet);
1304	}
1305
1306	public void sendPresencePacket(final PresencePacket packet) {
1307		this.sendPacket(packet);
1308	}
1309
1310	private synchronized void sendPacket(final AbstractStanza packet) {
1311		if (stanzasSent == Integer.MAX_VALUE) {
1312			resetStreamId();
1313			disconnect(true);
1314			return;
1315		}
1316		synchronized (this.mStanzaQueue) {
1317			tagWriter.writeStanzaAsync(packet);
1318			if (packet instanceof AbstractAcknowledgeableStanza) {
1319				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1320				++stanzasSent;
1321				this.mStanzaQueue.append(stanzasSent, stanza);
1322				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1323					if (Config.EXTENDED_SM_LOGGING) {
1324						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1325					}
1326					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1327				}
1328			}
1329		}
1330	}
1331
1332	public void sendPing() {
1333		if (!r()) {
1334			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1335			iq.setFrom(account.getJid());
1336			iq.addChild("ping", "urn:xmpp:ping");
1337			this.sendIqPacket(iq, null);
1338		}
1339		this.lastPingSent = SystemClock.elapsedRealtime();
1340	}
1341
1342	public void setOnMessagePacketReceivedListener(
1343			final OnMessagePacketReceived listener) {
1344		this.messageListener = listener;
1345			}
1346
1347	public void setOnUnregisteredIqPacketReceivedListener(
1348			final OnIqPacketReceived listener) {
1349		this.unregisteredIqListener = listener;
1350			}
1351
1352	public void setOnPresencePacketReceivedListener(
1353			final OnPresencePacketReceived listener) {
1354		this.presenceListener = listener;
1355			}
1356
1357	public void setOnJinglePacketReceivedListener(
1358			final OnJinglePacketReceived listener) {
1359		this.jingleListener = listener;
1360			}
1361
1362	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1363		this.statusListener = listener;
1364	}
1365
1366	public void setOnBindListener(final OnBindListener listener) {
1367		this.bindListener = listener;
1368	}
1369
1370	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1371		this.acknowledgedListener = listener;
1372	}
1373
1374	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1375		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1376			this.advancedStreamFeaturesLoadedListeners.add(listener);
1377		}
1378	}
1379
1380	private void forceCloseSocket() {
1381		if (socket != null) {
1382			try {
1383				socket.close();
1384			} catch (IOException e) {
1385				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1386			}
1387		} else {
1388			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1389		}
1390	}
1391
1392	public void interrupt() {
1393		Thread.currentThread().interrupt();
1394	}
1395
1396	public void disconnect(final boolean force) {
1397		interrupt();
1398		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1399		if (force) {
1400			forceCloseSocket();
1401		} else {
1402			if (tagWriter.isActive()) {
1403				tagWriter.finish();
1404				try {
1405					int i = 0;
1406					boolean warned = false;
1407					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1408						if (!warned) {
1409							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1410							warned = true;
1411						}
1412						try {
1413							Thread.sleep(200);
1414						} catch(InterruptedException e) {
1415							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1416						}
1417						i++;
1418					}
1419					if (warned) {
1420						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1421					}
1422					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1423					tagWriter.writeTag(Tag.end("stream:stream"));
1424				} catch (final IOException e) {
1425					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1426				} finally {
1427					forceCloseSocket();
1428				}
1429			}
1430		}
1431	}
1432
1433	public void resetStreamId() {
1434		this.streamId = null;
1435	}
1436
1437	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1438		synchronized (this.disco) {
1439			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1440			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1441				if (cursor.getValue().getFeatures().contains(feature)) {
1442					items.add(cursor);
1443				}
1444			}
1445			return items;
1446		}
1447	}
1448
1449	public Jid findDiscoItemByFeature(final String feature) {
1450		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1451		if (items.size() >= 1) {
1452			return items.get(0).getKey();
1453		}
1454		return null;
1455	}
1456
1457	public boolean r() {
1458		if (getFeatures().sm()) {
1459			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1460			return true;
1461		} else {
1462			return false;
1463		}
1464	}
1465
1466	public String getMucServer() {
1467		synchronized (this.disco) {
1468			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1469				final ServiceDiscoveryResult value = cursor.getValue();
1470				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1471						&& !value.getFeatures().contains("jabber:iq:gateway")
1472						&& !value.hasIdentity("conference", "irc")) {
1473					return cursor.getKey().toString();
1474				}
1475			}
1476		}
1477		return null;
1478	}
1479
1480	public int getTimeToNextAttempt() {
1481		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1482		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1483		return interval - secondsSinceLast;
1484	}
1485
1486	public int getAttempt() {
1487		return this.attempt;
1488	}
1489
1490	public Features getFeatures() {
1491		return this.features;
1492	}
1493
1494	public long getLastSessionEstablished() {
1495		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1496		return System.currentTimeMillis() - diff;
1497	}
1498
1499	public long getLastConnect() {
1500		return this.lastConnect;
1501	}
1502
1503	public long getLastPingSent() {
1504		return this.lastPingSent;
1505	}
1506
1507	public long getLastDiscoStarted() {
1508		return this.lastDiscoStarted;
1509	}
1510	public long getLastPacketReceived() {
1511		return this.lastPacketReceived;
1512	}
1513
1514	public void sendActive() {
1515		this.sendPacket(new ActivePacket());
1516	}
1517
1518	public void sendInactive() {
1519		this.sendPacket(new InactivePacket());
1520	}
1521
1522	public void resetAttemptCount(boolean resetConnectTime) {
1523		this.attempt = 0;
1524		if (resetConnectTime) {
1525			this.lastConnect = 0;
1526		}
1527	}
1528
1529	public void setInteractive(boolean interactive) {
1530		this.mInteractive = interactive;
1531	}
1532
1533	public Identity getServerIdentity() {
1534		synchronized (this.disco) {
1535			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1536			if (result == null) {
1537				return Identity.UNKNOWN;
1538			}
1539			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1540				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1541					switch (id.getName()) {
1542						case "Prosody":
1543							return Identity.PROSODY;
1544						case "ejabberd":
1545							return Identity.EJABBERD;
1546						case "Slack-XMPP":
1547							return Identity.SLACK;
1548					}
1549				}
1550			}
1551		}
1552		return Identity.UNKNOWN;
1553	}
1554
1555	private class StateChangingError extends Error {
1556		private final Account.State state;
1557
1558		public StateChangingError(Account.State state) {
1559			this.state = state;
1560		}
1561	}
1562
1563	private class StateChangingException extends IOException {
1564		private final Account.State state;
1565
1566		public StateChangingException(Account.State state) {
1567			this.state = state;
1568		}
1569	}
1570
1571	public enum Identity {
1572		FACEBOOK,
1573		SLACK,
1574		EJABBERD,
1575		PROSODY,
1576		NIMBUZZ,
1577		UNKNOWN
1578	}
1579
1580	public class Features {
1581		XmppConnection connection;
1582		private boolean carbonsEnabled = false;
1583		private boolean encryptionEnabled = false;
1584		private boolean blockListRequested = false;
1585
1586		public Features(final XmppConnection connection) {
1587			this.connection = connection;
1588		}
1589
1590		private boolean hasDiscoFeature(final Jid server, final String feature) {
1591			synchronized (XmppConnection.this.disco) {
1592				return connection.disco.containsKey(server) &&
1593						connection.disco.get(server).getFeatures().contains(feature);
1594			}
1595		}
1596
1597		public boolean carbons() {
1598			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1599		}
1600
1601		public boolean blocking() {
1602			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1603		}
1604
1605		public boolean spamReporting() {
1606			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1607		}
1608
1609		public boolean register() {
1610			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1611		}
1612
1613		public boolean sm() {
1614			return streamId != null
1615					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1616		}
1617
1618		public boolean csi() {
1619			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1620		}
1621
1622		public boolean pep() {
1623			synchronized (XmppConnection.this.disco) {
1624				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1625				return info != null && info.hasIdentity("pubsub", "pep");
1626			}
1627		}
1628
1629		public boolean pepPersistent() {
1630			synchronized (XmppConnection.this.disco) {
1631				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1632				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1633			}
1634		}
1635
1636		public boolean mam() {
1637			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1638					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1639		}
1640
1641		public boolean mamLegacy() {
1642			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1643					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1644		}
1645
1646		public boolean push() {
1647			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1648					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1649		}
1650
1651		public boolean rosterVersioning() {
1652			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1653		}
1654
1655		public void setBlockListRequested(boolean value) {
1656			this.blockListRequested = value;
1657		}
1658
1659		public boolean httpUpload(long filesize) {
1660			if (Config.DISABLE_HTTP_UPLOAD) {
1661				return false;
1662			} else {
1663				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1664				if (items.size() > 0) {
1665					try {
1666						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1667						if(filesize <= maxsize) {
1668							return true;
1669						} else {
1670							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1671							return false;
1672						}
1673					} catch (Exception e) {
1674						return true;
1675					}
1676				} else {
1677					return false;
1678				}
1679			}
1680		}
1681
1682		public long getMaxHttpUploadSize() {
1683			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1684				if (items.size() > 0) {
1685					try {
1686						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1687					} catch (Exception e) {
1688						return -1;
1689					}
1690				} else {
1691					return -1;
1692				}
1693		}
1694
1695		public boolean stanzaIds() {
1696			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1697		}
1698	}
1699
1700	private IqGenerator getIqGenerator() {
1701		return mXmppConnectionService.getIqGenerator();
1702	}
1703}