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.NotificationService;
  68import eu.siacs.conversations.services.XmppConnectionService;
  69import eu.siacs.conversations.utils.DNSHelper;
  70import eu.siacs.conversations.utils.SSLSocketHelper;
  71import eu.siacs.conversations.utils.SocksSocketFactory;
  72import eu.siacs.conversations.xml.Element;
  73import eu.siacs.conversations.xml.Tag;
  74import eu.siacs.conversations.xml.TagWriter;
  75import eu.siacs.conversations.xml.XmlReader;
  76import eu.siacs.conversations.xml.Namespace;
  77import eu.siacs.conversations.xmpp.forms.Data;
  78import eu.siacs.conversations.xmpp.forms.Field;
  79import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  80import eu.siacs.conversations.xmpp.jid.Jid;
  81import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
  82import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
  83import eu.siacs.conversations.xmpp.stanzas.AbstractAcknowledgeableStanza;
  84import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
  85import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  86import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  87import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
  88import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
  89import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
  90import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
  91import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
  92import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
  93import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
  94
  95public class XmppConnection implements Runnable {
  96
  97	private static final int PACKET_IQ = 0;
  98	private static final int PACKET_MESSAGE = 1;
  99	private static final int PACKET_PRESENCE = 2;
 100	protected final Account account;
 101	private final WakeLock wakeLock;
 102	private Socket socket;
 103	private XmlReader tagReader;
 104	private TagWriter tagWriter = new TagWriter();
 105	private final Features features = new Features(this);
 106	private boolean needsBinding = true;
 107	private boolean shouldAuthenticate = true;
 108	private Element streamFeatures;
 109	private final HashMap<Jid, ServiceDiscoveryResult> disco = new HashMap<>();
 110
 111	private String streamId = null;
 112	private int smVersion = 3;
 113	private final SparseArray<AbstractAcknowledgeableStanza> mStanzaQueue = new SparseArray<>();
 114
 115	private int stanzasReceived = 0;
 116	private int stanzasSent = 0;
 117	private long lastPacketReceived = 0;
 118	private long lastPingSent = 0;
 119	private long lastConnect = 0;
 120	private long lastSessionStarted = 0;
 121	private long lastDiscoStarted = 0;
 122	private AtomicInteger mPendingServiceDiscoveries = new AtomicInteger(0);
 123	private AtomicBoolean mWaitForDisco = new AtomicBoolean(true);
 124	private AtomicBoolean mWaitingForSmCatchup = new AtomicBoolean(false);
 125	private AtomicInteger mSmCatchupMessageCounter = new AtomicInteger(0);
 126	private boolean mInteractive = false;
 127	private int attempt = 0;
 128	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 129	private OnPresencePacketReceived presenceListener = null;
 130	private OnJinglePacketReceived jingleListener = null;
 131	private OnIqPacketReceived unregisteredIqListener = null;
 132	private OnMessagePacketReceived messageListener = null;
 133	private OnStatusChanged statusListener = null;
 134	private OnBindListener bindListener = null;
 135	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 136	private OnMessageAcknowledged acknowledgedListener = null;
 137	private final XmppConnectionService mXmppConnectionService;
 138
 139	private SaslMechanism saslMechanism;
 140
 141	private class MyKeyManager implements X509KeyManager {
 142		@Override
 143		public String chooseClientAlias(String[] strings, Principal[] principals, Socket socket) {
 144			return account.getPrivateKeyAlias();
 145		}
 146
 147		@Override
 148		public String chooseServerAlias(String s, Principal[] principals, Socket socket) {
 149			return null;
 150		}
 151
 152		@Override
 153		public X509Certificate[] getCertificateChain(String alias) {
 154			Log.d(Config.LOGTAG,"getting certificate chain");
 155			try {
 156				return KeyChain.getCertificateChain(mXmppConnectionService, alias);
 157			} catch (Exception e) {
 158				Log.d(Config.LOGTAG,e.getMessage());
 159				return new X509Certificate[0];
 160			}
 161		}
 162
 163		@Override
 164		public String[] getClientAliases(String s, Principal[] principals) {
 165			final String alias = account.getPrivateKeyAlias();
 166			return alias != null ? new String[]{alias} : new String[0];
 167		}
 168
 169		@Override
 170		public String[] getServerAliases(String s, Principal[] principals) {
 171			return new String[0];
 172		}
 173
 174		@Override
 175		public PrivateKey getPrivateKey(String alias) {
 176			try {
 177				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 178			} catch (Exception e) {
 179				return null;
 180			}
 181		}
 182	}
 183
 184	public final OnIqPacketReceived registrationResponseListener =  new OnIqPacketReceived() {
 185		@Override
 186		public void onIqPacketReceived(Account account, IqPacket packet) {
 187			if (packet.getType() == IqPacket.TYPE.RESULT) {
 188				account.setOption(Account.OPTION_REGISTER, false);
 189				forceCloseSocket();
 190				changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 191			} else {
 192				final List<String> PASSWORD_TOO_WEAK_MSGS = Arrays.asList(
 193						"The password is too weak",
 194						"Please use a longer password.");
 195				Element error = packet.findChild("error");
 196				Account.State state = Account.State.REGISTRATION_FAILED;
 197				if (error != null) {
 198					if (error.hasChild("conflict")) {
 199						state = Account.State.REGISTRATION_CONFLICT;
 200					} else if (error.hasChild("resource-constraint")
 201							&& "wait".equals(error.getAttribute("type"))) {
 202						state = Account.State.REGISTRATION_PLEASE_WAIT;
 203					} else if (error.hasChild("not-acceptable")
 204							&& PASSWORD_TOO_WEAK_MSGS.contains(error.findChildContent("text"))) {
 205						state = Account.State.REGISTRATION_PASSWORD_TOO_WEAK;
 206					}
 207				}
 208				changeStatus(state);
 209				forceCloseSocket();
 210			}
 211		}
 212	};
 213
 214	public XmppConnection(final Account account, final XmppConnectionService service) {
 215		this.account = account;
 216		this.wakeLock = service.getPowerManager().newWakeLock(
 217				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 218		mXmppConnectionService = service;
 219	}
 220
 221	protected synchronized void changeStatus(final Account.State nextStatus) {
 222		if (Thread.currentThread().isInterrupted()) {
 223			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not changing status to "+nextStatus+" because thread was interrupted");
 224			return;
 225		}
 226		if (account.getStatus() != nextStatus) {
 227			if ((nextStatus == Account.State.OFFLINE)
 228					&& (account.getStatus() != Account.State.CONNECTING)
 229					&& (account.getStatus() != Account.State.ONLINE)
 230					&& (account.getStatus() != Account.State.DISABLED)) {
 231				return;
 232					}
 233			if (nextStatus == Account.State.ONLINE) {
 234				this.attempt = 0;
 235			}
 236			account.setStatus(nextStatus);
 237			if (statusListener != null) {
 238				statusListener.onStatusChanged(account);
 239			}
 240		}
 241	}
 242
 243	public void prepareNewConnection() {
 244		this.lastConnect = SystemClock.elapsedRealtime();
 245		this.lastPingSent = SystemClock.elapsedRealtime();
 246		this.lastDiscoStarted = Long.MAX_VALUE;
 247		this.mWaitingForSmCatchup.set(false);
 248		this.changeStatus(Account.State.CONNECTING);
 249	}
 250
 251	public boolean isWaitingForSmCatchup() {
 252		return mWaitingForSmCatchup.get();
 253	}
 254
 255	public void incrementSmCatchupMessageCounter() {
 256		this.mSmCatchupMessageCounter.incrementAndGet();
 257	}
 258
 259	protected void connect() {
 260		if (mXmppConnectionService.areMessagesInitialized()) {
 261			mXmppConnectionService.resetSendingToWaiting(account);
 262		}
 263		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 264		features.encryptionEnabled = false;
 265		this.attempt++;
 266		try {
 267			Socket localSocket;
 268			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 269			this.changeStatus(Account.State.CONNECTING);
 270			final boolean useTor = mXmppConnectionService.useTorToConnect() || account.isOnion();
 271			final boolean extended = mXmppConnectionService.showExtendedConnectionOptions();
 272			if (useTor) {
 273				String destination;
 274				if (account.getHostname() == null || account.getHostname().isEmpty()) {
 275					destination = account.getServer().toString();
 276				} else {
 277					destination = account.getHostname();
 278				}
 279				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": connect to " + destination + " via Tor");
 280				localSocket = SocksSocketFactory.createSocketOverTor(destination, account.getPort());
 281				try {
 282					startXmpp(localSocket);
 283				} catch (InterruptedException e) {
 284					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 285					return;
 286				} catch (Exception e) {
 287					throw new IOException(e.getMessage());
 288				}
 289			} else if (extended && account.getHostname() != null && !account.getHostname().isEmpty()) {
 290
 291				InetSocketAddress address = new InetSocketAddress(account.getHostname(), account.getPort());
 292
 293				features.encryptionEnabled = account.getPort() == 5223;
 294
 295				try {
 296					if (features.encryptionEnabled) {
 297						try {
 298							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 299							localSocket = tlsFactoryVerifier.factory.createSocket();
 300							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 301							final SSLSession session = ((SSLSocket) localSocket).getSession();
 302							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), session)) {
 303								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 304								throw new StateChangingException(Account.State.TLS_ERROR);
 305							}
 306						} catch (KeyManagementException e) {
 307							features.encryptionEnabled = false;
 308							localSocket = new Socket();
 309						}
 310					} else {
 311						localSocket = new Socket();
 312						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 313					}
 314				} catch (IOException e) {
 315					throw new UnknownHostException();
 316				}
 317				try {
 318					startXmpp(localSocket);
 319				} catch (InterruptedException e) {
 320					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 321					return;
 322				} catch (Exception e) {
 323					throw new IOException(e.getMessage());
 324				}
 325			} else if (DNSHelper.isIp(account.getServer().toString())) {
 326				localSocket = new Socket();
 327				try {
 328					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 329				} catch (IOException e) {
 330					throw new UnknownHostException();
 331				}
 332				try {
 333					startXmpp(localSocket);
 334				} catch (InterruptedException e) {
 335					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 336					return;
 337				} catch (Exception e) {
 338					throw new IOException(e.getMessage());
 339				}
 340			} else {
 341				final Bundle result = DNSHelper.getSRVRecord(account.getServer(), mXmppConnectionService);
 342				final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
 343				for (Iterator<Parcelable> iterator = values.iterator(); iterator.hasNext(); ) {
 344					if (Thread.currentThread().isInterrupted()) {
 345						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 346						return;
 347					}
 348					final Bundle namePort = (Bundle) iterator.next();
 349					try {
 350						String srvRecordServer;
 351						try {
 352							srvRecordServer = IDN.toASCII(namePort.getString("name"));
 353						} catch (final IllegalArgumentException e) {
 354							// TODO: Handle me?`
 355							srvRecordServer = "";
 356						}
 357						final int srvRecordPort = namePort.getInt("port");
 358						final String srvIpServer = namePort.getString("ip");
 359						// if tls is true, encryption is implied and must not be started
 360						features.encryptionEnabled = namePort.getBoolean("tls");
 361						final InetSocketAddress addr;
 362						if (srvIpServer != null) {
 363							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
 364							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 365									+ ": using values from dns " + srvRecordServer
 366									+ "[" + srvIpServer + "]:" + srvRecordPort + " tls: " + features.encryptionEnabled);
 367						} else {
 368							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
 369							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 370									+ ": using values from dns "
 371									+ srvRecordServer + ":" + srvRecordPort + " tls: " + features.encryptionEnabled);
 372						}
 373
 374						if (!features.encryptionEnabled) {
 375							localSocket = new Socket();
 376							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 377						} else {
 378							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 379							localSocket = tlsFactoryVerifier.factory.createSocket();
 380
 381							if (localSocket == null) {
 382								throw new IOException("could not initialize ssl socket");
 383							}
 384
 385							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 386							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 387							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 388
 389							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 390
 391							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), ((SSLSocket) localSocket).getSession())) {
 392								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 393								throw new StateChangingException(Account.State.TLS_ERROR);
 394							}
 395						}
 396						if (startXmpp(localSocket)) {
 397							break; // successfully connected to server that speaks xmpp
 398						} else {
 399							localSocket.close();
 400						}
 401					} catch (final StateChangingException e) {
 402						throw e;
 403					} catch (InterruptedException e) {
 404						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 405						return;
 406					} catch (final Throwable e) {
 407						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 408						if (!iterator.hasNext()) {
 409							throw new UnknownHostException();
 410						}
 411					}
 412				}
 413			}
 414			processStream();
 415		}  catch (final SecurityException e) {
 416			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 417		} catch(final StateChangingException e) {
 418			this.changeStatus(e.state);
 419		} catch (final UnknownHostException | ConnectException e) {
 420			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 421		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 422			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 423		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 424			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 425			this.changeStatus(Account.State.OFFLINE);
 426			this.attempt = Math.max(0, this.attempt - 1);
 427		} finally {
 428			if (!Thread.currentThread().isInterrupted()) {
 429				forceCloseSocket();
 430				if (wakeLock.isHeld()) {
 431					try {
 432						wakeLock.release();
 433					} catch (final RuntimeException ignored) {
 434					}
 435				}
 436			} else {
 437				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock because thread was interrupted");
 438			}
 439		}
 440	}
 441
 442	/**
 443	 * Starts xmpp protocol, call after connecting to socket
 444	 * @return true if server returns with valid xmpp, false otherwise
 445     */
 446	private boolean startXmpp(Socket socket) throws Exception {
 447		if (Thread.currentThread().isInterrupted()) {
 448			throw new InterruptedException();
 449		}
 450		this.socket = socket;
 451		tagReader = new XmlReader(wakeLock);
 452		if (tagWriter != null) {
 453			tagWriter.forceClose();
 454		}
 455		tagWriter = new TagWriter();
 456		tagWriter.setOutputStream(socket.getOutputStream());
 457		tagReader.setInputStream(socket.getInputStream());
 458		tagWriter.beginDocument();
 459		sendStartStream();
 460		final Tag tag = tagReader.readTag();
 461		return tag != null && tag.isStart("stream");
 462	}
 463
 464	private static class TlsFactoryVerifier {
 465		private final SSLSocketFactory factory;
 466		private final HostnameVerifier verifier;
 467
 468		public TlsFactoryVerifier(final SSLSocketFactory factory, final HostnameVerifier verifier) throws IOException {
 469			this.factory = factory;
 470			this.verifier = verifier;
 471			if (factory == null || verifier == null) {
 472				throw new IOException("could not setup ssl");
 473			}
 474		}
 475	}
 476
 477	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 478		final SSLContext sc = SSLSocketHelper.getSSLContext();
 479		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 480		KeyManager[] keyManager;
 481		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 482			keyManager = new KeyManager[]{new MyKeyManager()};
 483		} else {
 484			keyManager = null;
 485		}
 486		String domain = account.getJid().getDomainpart();
 487		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 488		final SSLSocketFactory factory = sc.getSocketFactory();
 489		final HostnameVerifier verifier;
 490		if (mInteractive) {
 491			verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier());
 492		} else {
 493			verifier = trustManager.wrapHostnameVerifierNonInteractive(new XmppDomainVerifier());
 494		}
 495
 496		return new TlsFactoryVerifier(factory, verifier);
 497	}
 498
 499	@Override
 500	public void run() {
 501		forceCloseSocket();
 502		connect();
 503	}
 504
 505	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 506		Tag nextTag = tagReader.readTag();
 507		while (nextTag != null && !nextTag.isEnd("stream")) {
 508			if (nextTag.isStart("error")) {
 509				processStreamError(nextTag);
 510			} else if (nextTag.isStart("features")) {
 511				processStreamFeatures(nextTag);
 512			} else if (nextTag.isStart("proceed")) {
 513				switchOverToTls(nextTag);
 514			} else if (nextTag.isStart("success")) {
 515				final String challenge = tagReader.readElement(nextTag).getContent();
 516				try {
 517					saslMechanism.getResponse(challenge);
 518				} catch (final SaslMechanism.AuthenticationException e) {
 519					Log.e(Config.LOGTAG, String.valueOf(e));
 520					throw new StateChangingException(Account.State.UNAUTHORIZED);
 521				}
 522				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 523				account.setKey(Account.PINNED_MECHANISM_KEY,
 524						String.valueOf(saslMechanism.getPriority()));
 525				tagReader.reset();
 526				sendStartStream();
 527				final Tag tag = tagReader.readTag();
 528				if (tag != null && tag.isStart("stream")) {
 529					processStream();
 530				} else {
 531					throw new IOException("server didn't restart stream after successful auth");
 532				}
 533				break;
 534			} else if (nextTag.isStart("failure")) {
 535				final Element failure = tagReader.readElement(nextTag);
 536				if (Namespace.SASL.equals(failure.getNamespace())) {
 537					final String text = failure.findChildContent("text");
 538					if (failure.hasChild("account-disabled")
 539							&& text != null
 540							&& text.contains("renew")
 541							&& Config.MAGIC_CREATE_DOMAIN != null
 542							&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 543						throw new StateChangingException(Account.State.PAYMENT_REQUIRED);
 544					} else {
 545						throw new StateChangingException(Account.State.UNAUTHORIZED);
 546					}
 547				} else if (Namespace.TLS.equals(failure.getNamespace())) {
 548					throw new StateChangingException(Account.State.TLS_ERROR);
 549				} else {
 550					throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 551				}
 552			} else if (nextTag.isStart("challenge")) {
 553				final String challenge = tagReader.readElement(nextTag).getContent();
 554				final Element response = new Element("response",Namespace.SASL);
 555				try {
 556					response.setContent(saslMechanism.getResponse(challenge));
 557				} catch (final SaslMechanism.AuthenticationException e) {
 558					// TODO: Send auth abort tag.
 559					Log.e(Config.LOGTAG, e.toString());
 560				}
 561				tagWriter.writeElement(response);
 562			} else if (nextTag.isStart("enabled")) {
 563				final Element enabled = tagReader.readElement(nextTag);
 564				if ("true".equals(enabled.getAttribute("resume"))) {
 565					this.streamId = enabled.getAttribute("id");
 566					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 567							+ ": stream management(" + smVersion
 568							+ ") enabled (resumable)");
 569				} else {
 570					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 571							+ ": stream management(" + smVersion + ") enabled");
 572				}
 573				this.stanzasReceived = 0;
 574				final RequestPacket r = new RequestPacket(smVersion);
 575				tagWriter.writeStanzaAsync(r);
 576			} else if (nextTag.isStart("resumed")) {
 577				this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 578				lastPacketReceived = SystemClock.elapsedRealtime();
 579				final Element resumed = tagReader.readElement(nextTag);
 580				final String h = resumed.getAttribute("h");
 581				try {
 582					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 583					synchronized (this.mStanzaQueue) {
 584						final int serverCount = Integer.parseInt(h);
 585						if (serverCount != stanzasSent) {
 586							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 587									+ ": session resumed with lost packages");
 588							stanzasSent = serverCount;
 589						} else {
 590							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 591						}
 592						acknowledgeStanzaUpTo(serverCount);
 593						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 594							failedStanzas.add(mStanzaQueue.valueAt(i));
 595						}
 596						mStanzaQueue.clear();
 597					}
 598					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 599					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 600						if (packet instanceof MessagePacket) {
 601							MessagePacket message = (MessagePacket) packet;
 602							mXmppConnectionService.markMessage(account,
 603									message.getTo().toBareJid(),
 604									message.getId(),
 605									Message.STATUS_UNSEND);
 606						}
 607						sendPacket(packet);
 608					}
 609				} catch (final NumberFormatException ignored) {
 610				}
 611				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 612				changeStatus(Account.State.ONLINE);
 613			} else if (nextTag.isStart("r")) {
 614				tagReader.readElement(nextTag);
 615				if (Config.EXTENDED_SM_LOGGING) {
 616					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 617				}
 618				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 619				tagWriter.writeStanzaAsync(ack);
 620			} else if (nextTag.isStart("a")) {
 621				boolean accountUiNeedsRefresh = false;
 622				synchronized (NotificationService.CATCHUP_LOCK) {
 623					if (mWaitingForSmCatchup.compareAndSet(true, false)) {
 624						int count = mSmCatchupMessageCounter.get();
 625						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": SM catchup complete (" + count + ")");
 626						accountUiNeedsRefresh = true;
 627						if (count > 0) {
 628							mXmppConnectionService.getNotificationService().finishBacklog(true, account);
 629						}
 630					}
 631				}
 632				if (accountUiNeedsRefresh) {
 633					mXmppConnectionService.updateAccountUi();
 634				}
 635				final Element ack = tagReader.readElement(nextTag);
 636				lastPacketReceived = SystemClock.elapsedRealtime();
 637				try {
 638					synchronized (this.mStanzaQueue) {
 639						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 640						acknowledgeStanzaUpTo(serverSequence);
 641					}
 642				} catch (NumberFormatException | NullPointerException e) {
 643					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 644				}
 645			} else if (nextTag.isStart("failed")) {
 646				Element failed = tagReader.readElement(nextTag);
 647				try {
 648					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 649					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 650					synchronized (this.mStanzaQueue) {
 651						acknowledgeStanzaUpTo(serverCount);
 652					}
 653				} catch (NumberFormatException | NullPointerException e) {
 654					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 655				}
 656				resetStreamId();
 657				sendBindRequest();
 658			} else if (nextTag.isStart("iq")) {
 659				processIq(nextTag);
 660			} else if (nextTag.isStart("message")) {
 661				processMessage(nextTag);
 662			} else if (nextTag.isStart("presence")) {
 663				processPresence(nextTag);
 664			}
 665			nextTag = tagReader.readTag();
 666		}
 667	}
 668
 669	private void acknowledgeStanzaUpTo(int serverCount) {
 670		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 671			if (serverCount >= mStanzaQueue.keyAt(i)) {
 672				if (Config.EXTENDED_SM_LOGGING) {
 673					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 674				}
 675				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 676				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 677					MessagePacket packet = (MessagePacket) stanza;
 678					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 679				}
 680				mStanzaQueue.removeAt(i);
 681				i--;
 682			}
 683		}
 684	}
 685
 686	private Element processPacket(final Tag currentTag, final int packetType)
 687		throws XmlPullParserException, IOException {
 688		Element element;
 689		switch (packetType) {
 690			case PACKET_IQ:
 691				element = new IqPacket();
 692				break;
 693			case PACKET_MESSAGE:
 694				element = new MessagePacket();
 695				break;
 696			case PACKET_PRESENCE:
 697				element = new PresencePacket();
 698				break;
 699			default:
 700				return null;
 701		}
 702		element.setAttributes(currentTag.getAttributes());
 703		Tag nextTag = tagReader.readTag();
 704		if (nextTag == null) {
 705			throw new IOException("interrupted mid tag");
 706		}
 707		while (!nextTag.isEnd(element.getName())) {
 708			if (!nextTag.isNo()) {
 709				final Element child = tagReader.readElement(nextTag);
 710				final String type = currentTag.getAttribute("type");
 711				if (packetType == PACKET_IQ
 712						&& "jingle".equals(child.getName())
 713						&& ("set".equalsIgnoreCase(type) || "get"
 714							.equalsIgnoreCase(type))) {
 715					element = new JinglePacket();
 716					element.setAttributes(currentTag.getAttributes());
 717							}
 718				element.addChild(child);
 719			}
 720			nextTag = tagReader.readTag();
 721			if (nextTag == null) {
 722				throw new IOException("interrupted mid tag");
 723			}
 724		}
 725		if (stanzasReceived == Integer.MAX_VALUE) {
 726			resetStreamId();
 727			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 728		}
 729		++stanzasReceived;
 730		lastPacketReceived = SystemClock.elapsedRealtime();
 731		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 732			Log.d(Config.LOGTAG,"[background stanza] "+element);
 733		}
 734		return element;
 735	}
 736
 737	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 738		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 739
 740		if (packet.getId() == null) {
 741			return; // an iq packet without id is definitely invalid
 742		}
 743
 744		if (packet instanceof JinglePacket) {
 745			if (this.jingleListener != null) {
 746				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 747			}
 748		} else {
 749			OnIqPacketReceived callback = null;
 750			synchronized (this.packetCallbacks) {
 751				if (packetCallbacks.containsKey(packet.getId())) {
 752					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 753					// Packets to the server should have responses from the server
 754					if (packetCallbackDuple.first.toServer(account)) {
 755						if (packet.fromServer(account)) {
 756							callback = packetCallbackDuple.second;
 757							packetCallbacks.remove(packet.getId());
 758						} else {
 759							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 760						}
 761					} else {
 762						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 763							callback = packetCallbackDuple.second;
 764							packetCallbacks.remove(packet.getId());
 765						} else {
 766							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 767						}
 768					}
 769				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 770					callback = this.unregisteredIqListener;
 771				}
 772			}
 773			if (callback != null) {
 774				try {
 775					callback.onIqPacketReceived(account, packet);
 776				} catch (StateChangingError error) {
 777					throw new StateChangingException(error.state);
 778				}
 779			}
 780		}
 781	}
 782
 783	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 784		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 785		this.messageListener.onMessagePacketReceived(account, packet);
 786	}
 787
 788	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 789		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 790		this.presenceListener.onPresencePacketReceived(account, packet);
 791	}
 792
 793	private void sendStartTLS() throws IOException {
 794		final Tag startTLS = Tag.empty("starttls");
 795		startTLS.setAttribute("xmlns", Namespace.TLS);
 796		tagWriter.writeTag(startTLS);
 797	}
 798
 799
 800
 801	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 802		tagReader.readTag();
 803		try {
 804			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 805			final InetAddress address = socket == null ? null : socket.getInetAddress();
 806
 807			if (address == null) {
 808				throw new IOException("could not setup ssl");
 809			}
 810
 811			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 812
 813			if (sslSocket == null) {
 814				throw new IOException("could not initialize ssl socket");
 815			}
 816
 817			SSLSocketHelper.setSecurity(sslSocket);
 818
 819			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), sslSocket.getSession())) {
 820				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 821				throw new StateChangingException(Account.State.TLS_ERROR);
 822			}
 823			tagReader.setInputStream(sslSocket.getInputStream());
 824			tagWriter.setOutputStream(sslSocket.getOutputStream());
 825			sendStartStream();
 826			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 827			features.encryptionEnabled = true;
 828			final Tag tag = tagReader.readTag();
 829			if (tag != null && tag.isStart("stream")) {
 830				processStream();
 831			} else {
 832				throw new IOException("server didn't restart stream after STARTTLS");
 833			}
 834			sslSocket.close();
 835		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 836			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 837			throw new StateChangingException(Account.State.TLS_ERROR);
 838		}
 839	}
 840
 841	private void processStreamFeatures(final Tag currentTag)
 842		throws XmlPullParserException, IOException {
 843		this.streamFeatures = tagReader.readElement(currentTag);
 844		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 845			sendStartTLS();
 846		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 847			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 848				sendRegistryRequest();
 849			} else {
 850				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 851			}
 852		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 853			throw new StateChangingException(Account.State.REGISTRATION_NOT_SUPPORTED);
 854		} else if (this.streamFeatures.hasChild("mechanisms")
 855				&& shouldAuthenticate
 856				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 857			authenticate();
 858		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 859			if (Config.EXTENDED_SM_LOGGING) {
 860				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 861			}
 862			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 863			this.mSmCatchupMessageCounter.set(0);
 864			this.mWaitingForSmCatchup.set(true);
 865			this.tagWriter.writeStanzaAsync(resume);
 866		} else if (needsBinding) {
 867			if (this.streamFeatures.hasChild("bind")) {
 868				sendBindRequest();
 869			} else {
 870				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 871			}
 872		}
 873	}
 874
 875	private void authenticate() throws IOException {
 876		final List<String> mechanisms = extractMechanisms(streamFeatures
 877				.findChild("mechanisms"));
 878		final Element auth = new Element("auth",Namespace.SASL);
 879		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 880			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 881		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 882			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 883		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 884			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 885		} else if (mechanisms.contains("PLAIN")) {
 886			saslMechanism = new Plain(tagWriter, account);
 887		} else if (mechanisms.contains("DIGEST-MD5")) {
 888			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 889		} else if (mechanisms.contains("ANONYMOUS")) {
 890			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 891		}
 892		if (saslMechanism != null) {
 893			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 894			if (pinnedMechanism > saslMechanism.getPriority()) {
 895				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 896						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 897						") than pinned priority (" + pinnedMechanism +
 898						"). Possible downgrade attack?");
 899				throw new StateChangingException(Account.State.DOWNGRADE_ATTACK);
 900			}
 901			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 902			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 903			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 904				auth.setContent(saslMechanism.getClientFirstMessage());
 905			}
 906			tagWriter.writeElement(auth);
 907		} else {
 908			throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 909		}
 910	}
 911
 912	private List<String> extractMechanisms(final Element stream) {
 913		final ArrayList<String> mechanisms = new ArrayList<>(stream
 914				.getChildren().size());
 915		for (final Element child : stream.getChildren()) {
 916			mechanisms.add(child.getContent());
 917		}
 918		return mechanisms;
 919	}
 920
 921	private void sendRegistryRequest() {
 922		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 923		register.query("jabber:iq:register");
 924		register.setTo(account.getServer());
 925		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 926
 927			@Override
 928			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 929				boolean failed = false;
 930				if (packet.getType() == IqPacket.TYPE.RESULT
 931						&& packet.query().hasChild("username")
 932						&& (packet.query().hasChild("password"))) {
 933					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 934					final Element username = new Element("username").setContent(account.getUsername());
 935					final Element password = new Element("password").setContent(account.getPassword());
 936					register.query("jabber:iq:register").addChild(username);
 937					register.query().addChild(password);
 938					register.setFrom(account.getJid().toBareJid());
 939					sendUnmodifiedIqPacket(register, registrationResponseListener);
 940				} else if (packet.getType() == IqPacket.TYPE.RESULT
 941						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 942					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 943					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 944					final String id = packet.getId();
 945
 946					Bitmap captcha = null;
 947					if (blob != null) {
 948						try {
 949							final String base64Blob = blob.getContent();
 950							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 951							InputStream stream = new ByteArrayInputStream(strBlob);
 952							captcha = BitmapFactory.decodeStream(stream);
 953						} catch (Exception e) {
 954							//ignored
 955						}
 956					} else {
 957						try {
 958							Field url = data.getFieldByName("url");
 959							String urlString = url.findChildContent("value");
 960							URL uri = new URL(urlString);
 961							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 962						} catch (IOException e) {
 963							Log.e(Config.LOGTAG, e.toString());
 964						}
 965					}
 966
 967					if (captcha != null) {
 968						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 969					}
 970				} else {
 971					failed = true;
 972				}
 973
 974				if (failed) {
 975					final Element instructions = packet.query().findChild("instructions");
 976					setAccountCreationFailed((instructions != null) ? instructions.getContent() : "");
 977				}
 978			}
 979		});
 980	}
 981
 982	private void setAccountCreationFailed(String instructions) {
 983		changeStatus(Account.State.REGISTRATION_FAILED);
 984		disconnect(true);
 985		Log.d(Config.LOGTAG, account.getJid().toBareJid()
 986				+ ": could not register. instructions are"
 987				+ instructions);
 988	}
 989
 990	public void resetEverything() {
 991		resetAttemptCount(true);
 992		resetStreamId();
 993		clearIqCallbacks();
 994		mStanzaQueue.clear();
 995		synchronized (this.disco) {
 996			disco.clear();
 997		}
 998	}
 999
1000	private void sendBindRequest() {
1001		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
1002			try {
1003				Thread.sleep(500);
1004			} catch (final InterruptedException ignored) {
1005			}
1006		}
1007		needsBinding = false;
1008		clearIqCallbacks();
1009		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1010		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1011				.addChild("resource").setContent(account.getResource());
1012		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1013			@Override
1014			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1015				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1016					return;
1017				}
1018				final Element bind = packet.findChild("bind");
1019				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1020					final Element jid = bind.findChild("jid");
1021					if (jid != null && jid.getContent() != null) {
1022						try {
1023							if (account.setJid(Jid.fromString(jid.getContent()))) {
1024								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1025								mXmppConnectionService.databaseBackend.updateAccount(account);
1026							}
1027							if (streamFeatures.hasChild("session")
1028									&& !streamFeatures.findChild("session").hasChild("optional")) {
1029								sendStartSession();
1030							} else {
1031								sendPostBindInitialization();
1032							}
1033							return;
1034						} catch (final InvalidJidException e) {
1035							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1036						}
1037					} else {
1038						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1039					}
1040				} else {
1041					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1042				}
1043				account.setResource(account.getResource().split("\\.")[0]);
1044				throw new StateChangingError(Account.State.BIND_FAILURE);
1045			}
1046		});
1047	}
1048
1049	private void clearIqCallbacks() {
1050		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1051		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1052		synchronized (this.packetCallbacks) {
1053			if (this.packetCallbacks.size() == 0) {
1054				return;
1055			}
1056			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1057			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1058			while (iterator.hasNext()) {
1059				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1060				callbacks.add(entry.second);
1061				iterator.remove();
1062			}
1063		}
1064		for(OnIqPacketReceived callback : callbacks) {
1065			callback.onIqPacketReceived(account,failurePacket);
1066		}
1067		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1068	}
1069
1070	public void sendDiscoTimeout() {
1071		if (mWaitForDisco.compareAndSet(true, false)) {
1072			finalizeBind();
1073		}
1074	}
1075
1076	private void sendStartSession() {
1077		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1078		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1079		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1080		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1081			@Override
1082			public void onIqPacketReceived(Account account, IqPacket packet) {
1083				if (packet.getType() == IqPacket.TYPE.RESULT) {
1084					sendPostBindInitialization();
1085				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1086					throw new StateChangingError(Account.State.SESSION_FAILURE);
1087				}
1088			}
1089		});
1090	}
1091
1092	private void sendPostBindInitialization() {
1093		smVersion = 0;
1094		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1095			smVersion = 3;
1096		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1097			smVersion = 2;
1098		}
1099		if (smVersion != 0) {
1100			synchronized (this.mStanzaQueue) {
1101				final EnablePacket enable = new EnablePacket(smVersion);
1102				tagWriter.writeStanzaAsync(enable);
1103				stanzasSent = 0;
1104				mStanzaQueue.clear();
1105			}
1106		}
1107		features.carbonsEnabled = false;
1108		features.blockListRequested = false;
1109		synchronized (this.disco) {
1110			this.disco.clear();
1111		}
1112		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1113		mPendingServiceDiscoveries.set(0);
1114		if (smVersion == 0 || Patches.DISCO_EXCEPTIONS.contains(account.getJid().getDomainpart())) {
1115			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": do not wait for service discovery");
1116			mWaitForDisco.set(false);
1117		} else {
1118			mWaitForDisco.set(true);
1119		}
1120		lastDiscoStarted = SystemClock.elapsedRealtime();
1121		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1122		Element caps = streamFeatures.findChild("c");
1123		final String hash = caps == null ? null : caps.getAttribute("hash");
1124		final String ver = caps == null ? null : caps.getAttribute("ver");
1125		ServiceDiscoveryResult discoveryResult = null;
1126		if (hash != null && ver != null) {
1127			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1128		}
1129		if (discoveryResult == null) {
1130			sendServiceDiscoveryInfo(account.getServer());
1131		} else {
1132			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1133			disco.put(account.getServer(), discoveryResult);
1134		}
1135		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1136		sendServiceDiscoveryItems(account.getServer());
1137
1138		if (!mWaitForDisco.get()) {
1139			finalizeBind();
1140		}
1141		this.lastSessionStarted = SystemClock.elapsedRealtime();
1142	}
1143
1144	private void sendServiceDiscoveryInfo(final Jid jid) {
1145		mPendingServiceDiscoveries.incrementAndGet();
1146		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1147		iq.setTo(jid);
1148		iq.query("http://jabber.org/protocol/disco#info");
1149		this.sendIqPacket(iq, new OnIqPacketReceived() {
1150
1151			@Override
1152			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1153				if (packet.getType() == IqPacket.TYPE.RESULT) {
1154					boolean advancedStreamFeaturesLoaded;
1155					synchronized (XmppConnection.this.disco) {
1156						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1157						if (jid.equals(account.getServer())) {
1158							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1159						}
1160						disco.put(jid, result);
1161						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1162								&& disco.containsKey(account.getJid().toBareJid());
1163					}
1164					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1165						enableAdvancedStreamFeatures();
1166					}
1167				} else {
1168					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1169				}
1170				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1171					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1172							&& mWaitForDisco.compareAndSet(true, false)) {
1173						finalizeBind();
1174					}
1175				}
1176			}
1177		});
1178	}
1179
1180	private void finalizeBind() {
1181		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1182		if (bindListener != null) {
1183			bindListener.onBind(account);
1184		}
1185		changeStatus(Account.State.ONLINE);
1186	}
1187
1188	private void enableAdvancedStreamFeatures() {
1189		if (getFeatures().carbons() && !features.carbonsEnabled) {
1190			sendEnableCarbons();
1191		}
1192		if (getFeatures().blocking() && !features.blockListRequested) {
1193			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1194			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1195		}
1196		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1197			listener.onAdvancedStreamFeaturesAvailable(account);
1198		}
1199	}
1200
1201	private void sendServiceDiscoveryItems(final Jid server) {
1202		mPendingServiceDiscoveries.incrementAndGet();
1203		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1204		iq.setTo(server.toDomainJid());
1205		iq.query("http://jabber.org/protocol/disco#items");
1206		this.sendIqPacket(iq, new OnIqPacketReceived() {
1207
1208			@Override
1209			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1210				if (packet.getType() == IqPacket.TYPE.RESULT) {
1211					final List<Element> elements = packet.query().getChildren();
1212					for (final Element element : elements) {
1213						if (element.getName().equals("item")) {
1214							final Jid jid = element.getAttributeAsJid("jid");
1215							if (jid != null && !jid.equals(account.getServer())) {
1216								sendServiceDiscoveryInfo(jid);
1217							}
1218						}
1219					}
1220				} else {
1221					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1222				}
1223				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1224					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1225							&& mWaitForDisco.compareAndSet(true, false)) {
1226						finalizeBind();
1227					}
1228				}
1229			}
1230		});
1231	}
1232
1233	private void sendEnableCarbons() {
1234		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1235		iq.addChild("enable", "urn:xmpp:carbons:2");
1236		this.sendIqPacket(iq, new OnIqPacketReceived() {
1237
1238			@Override
1239			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1240				if (!packet.hasChild("error")) {
1241					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1242							+ ": successfully enabled carbons");
1243					features.carbonsEnabled = true;
1244				} else {
1245					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1246							+ ": error enableing carbons " + packet.toString());
1247				}
1248			}
1249		});
1250	}
1251
1252	private void processStreamError(final Tag currentTag)
1253		throws XmlPullParserException, IOException {
1254		final Element streamError = tagReader.readElement(currentTag);
1255		if (streamError == null) {
1256			return;
1257		}
1258		if (streamError.hasChild("conflict")) {
1259			final String resource = account.getResource().split("\\.")[0];
1260			account.setResource(resource + "." + nextRandomId());
1261			Log.d(Config.LOGTAG,
1262					account.getJid().toBareJid() + ": switching resource due to conflict ("
1263					+ account.getResource() + ")");
1264			throw new IOException();
1265		} else if (streamError.hasChild("host-unknown")) {
1266			throw new StateChangingException(Account.State.HOST_UNKNOWN);
1267		} else if (streamError.hasChild("policy-violation")) {
1268			throw new StateChangingException(Account.State.POLICY_VIOLATION);
1269		} else {
1270			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1271			throw new StateChangingException(Account.State.STREAM_ERROR);
1272		}
1273	}
1274
1275	private void sendStartStream() throws IOException {
1276		final Tag stream = Tag.start("stream:stream");
1277		stream.setAttribute("to", account.getServer().toString());
1278		stream.setAttribute("version", "1.0");
1279		stream.setAttribute("xml:lang", "en");
1280		stream.setAttribute("xmlns", "jabber:client");
1281		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1282		tagWriter.writeTag(stream);
1283	}
1284
1285	private String nextRandomId() {
1286		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(36);
1287	}
1288
1289	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1290		packet.setFrom(account.getJid());
1291		return this.sendUnmodifiedIqPacket(packet, callback);
1292	}
1293
1294	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1295		if (packet.getId() == null) {
1296			final String id = nextRandomId();
1297			packet.setAttribute("id", id);
1298		}
1299		if (callback != null) {
1300			synchronized (this.packetCallbacks) {
1301				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1302			}
1303		}
1304		this.sendPacket(packet);
1305		return packet.getId();
1306	}
1307
1308	public void sendMessagePacket(final MessagePacket packet) {
1309		this.sendPacket(packet);
1310	}
1311
1312	public void sendPresencePacket(final PresencePacket packet) {
1313		this.sendPacket(packet);
1314	}
1315
1316	private synchronized void sendPacket(final AbstractStanza packet) {
1317		if (stanzasSent == Integer.MAX_VALUE) {
1318			resetStreamId();
1319			disconnect(true);
1320			return;
1321		}
1322		synchronized (this.mStanzaQueue) {
1323			tagWriter.writeStanzaAsync(packet);
1324			if (packet instanceof AbstractAcknowledgeableStanza) {
1325				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1326				++stanzasSent;
1327				this.mStanzaQueue.append(stanzasSent, stanza);
1328				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1329					if (Config.EXTENDED_SM_LOGGING) {
1330						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1331					}
1332					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1333				}
1334			}
1335		}
1336	}
1337
1338	public void sendPing() {
1339		if (!r()) {
1340			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1341			iq.setFrom(account.getJid());
1342			iq.addChild("ping", "urn:xmpp:ping");
1343			this.sendIqPacket(iq, null);
1344		}
1345		this.lastPingSent = SystemClock.elapsedRealtime();
1346	}
1347
1348	public void setOnMessagePacketReceivedListener(
1349			final OnMessagePacketReceived listener) {
1350		this.messageListener = listener;
1351			}
1352
1353	public void setOnUnregisteredIqPacketReceivedListener(
1354			final OnIqPacketReceived listener) {
1355		this.unregisteredIqListener = listener;
1356			}
1357
1358	public void setOnPresencePacketReceivedListener(
1359			final OnPresencePacketReceived listener) {
1360		this.presenceListener = listener;
1361			}
1362
1363	public void setOnJinglePacketReceivedListener(
1364			final OnJinglePacketReceived listener) {
1365		this.jingleListener = listener;
1366			}
1367
1368	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1369		this.statusListener = listener;
1370	}
1371
1372	public void setOnBindListener(final OnBindListener listener) {
1373		this.bindListener = listener;
1374	}
1375
1376	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1377		this.acknowledgedListener = listener;
1378	}
1379
1380	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1381		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1382			this.advancedStreamFeaturesLoadedListeners.add(listener);
1383		}
1384	}
1385
1386	private void forceCloseSocket() {
1387		if (socket != null) {
1388			try {
1389				socket.close();
1390			} catch (IOException e) {
1391				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1392			}
1393		} else {
1394			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1395		}
1396	}
1397
1398	public void interrupt() {
1399		Thread.currentThread().interrupt();
1400	}
1401
1402	public void disconnect(final boolean force) {
1403		interrupt();
1404		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1405		if (force) {
1406			forceCloseSocket();
1407		} else {
1408			if (tagWriter.isActive()) {
1409				tagWriter.finish();
1410				try {
1411					int i = 0;
1412					boolean warned = false;
1413					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1414						if (!warned) {
1415							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1416							warned = true;
1417						}
1418						try {
1419							Thread.sleep(200);
1420						} catch(InterruptedException e) {
1421							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1422						}
1423						i++;
1424					}
1425					if (warned) {
1426						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1427					}
1428					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1429					tagWriter.writeTag(Tag.end("stream:stream"));
1430				} catch (final IOException e) {
1431					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1432				} finally {
1433					forceCloseSocket();
1434				}
1435			}
1436		}
1437	}
1438
1439	public void resetStreamId() {
1440		this.streamId = null;
1441	}
1442
1443	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1444		synchronized (this.disco) {
1445			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1446			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1447				if (cursor.getValue().getFeatures().contains(feature)) {
1448					items.add(cursor);
1449				}
1450			}
1451			return items;
1452		}
1453	}
1454
1455	public Jid findDiscoItemByFeature(final String feature) {
1456		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1457		if (items.size() >= 1) {
1458			return items.get(0).getKey();
1459		}
1460		return null;
1461	}
1462
1463	public boolean r() {
1464		if (getFeatures().sm()) {
1465			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1466			return true;
1467		} else {
1468			return false;
1469		}
1470	}
1471
1472	public String getMucServer() {
1473		synchronized (this.disco) {
1474			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1475				final ServiceDiscoveryResult value = cursor.getValue();
1476				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1477						&& !value.getFeatures().contains("jabber:iq:gateway")
1478						&& !value.hasIdentity("conference", "irc")) {
1479					return cursor.getKey().toString();
1480				}
1481			}
1482		}
1483		return null;
1484	}
1485
1486	public int getTimeToNextAttempt() {
1487		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1488		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1489		return interval - secondsSinceLast;
1490	}
1491
1492	public int getAttempt() {
1493		return this.attempt;
1494	}
1495
1496	public Features getFeatures() {
1497		return this.features;
1498	}
1499
1500	public long getLastSessionEstablished() {
1501		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1502		return System.currentTimeMillis() - diff;
1503	}
1504
1505	public long getLastConnect() {
1506		return this.lastConnect;
1507	}
1508
1509	public long getLastPingSent() {
1510		return this.lastPingSent;
1511	}
1512
1513	public long getLastDiscoStarted() {
1514		return this.lastDiscoStarted;
1515	}
1516	public long getLastPacketReceived() {
1517		return this.lastPacketReceived;
1518	}
1519
1520	public void sendActive() {
1521		this.sendPacket(new ActivePacket());
1522	}
1523
1524	public void sendInactive() {
1525		this.sendPacket(new InactivePacket());
1526	}
1527
1528	public void resetAttemptCount(boolean resetConnectTime) {
1529		this.attempt = 0;
1530		if (resetConnectTime) {
1531			this.lastConnect = 0;
1532		}
1533	}
1534
1535	public void setInteractive(boolean interactive) {
1536		this.mInteractive = interactive;
1537	}
1538
1539	public Identity getServerIdentity() {
1540		synchronized (this.disco) {
1541			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1542			if (result == null) {
1543				return Identity.UNKNOWN;
1544			}
1545			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1546				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1547					switch (id.getName()) {
1548						case "Prosody":
1549							return Identity.PROSODY;
1550						case "ejabberd":
1551							return Identity.EJABBERD;
1552						case "Slack-XMPP":
1553							return Identity.SLACK;
1554					}
1555				}
1556			}
1557		}
1558		return Identity.UNKNOWN;
1559	}
1560
1561	private class StateChangingError extends Error {
1562		private final Account.State state;
1563
1564		public StateChangingError(Account.State state) {
1565			this.state = state;
1566		}
1567	}
1568
1569	private class StateChangingException extends IOException {
1570		private final Account.State state;
1571
1572		public StateChangingException(Account.State state) {
1573			this.state = state;
1574		}
1575	}
1576
1577	public enum Identity {
1578		FACEBOOK,
1579		SLACK,
1580		EJABBERD,
1581		PROSODY,
1582		NIMBUZZ,
1583		UNKNOWN
1584	}
1585
1586	public class Features {
1587		XmppConnection connection;
1588		private boolean carbonsEnabled = false;
1589		private boolean encryptionEnabled = false;
1590		private boolean blockListRequested = false;
1591
1592		public Features(final XmppConnection connection) {
1593			this.connection = connection;
1594		}
1595
1596		private boolean hasDiscoFeature(final Jid server, final String feature) {
1597			synchronized (XmppConnection.this.disco) {
1598				return connection.disco.containsKey(server) &&
1599						connection.disco.get(server).getFeatures().contains(feature);
1600			}
1601		}
1602
1603		public boolean carbons() {
1604			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1605		}
1606
1607		public boolean blocking() {
1608			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1609		}
1610
1611		public boolean spamReporting() {
1612			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1613		}
1614
1615		public boolean register() {
1616			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1617		}
1618
1619		public boolean sm() {
1620			return streamId != null
1621					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1622		}
1623
1624		public boolean csi() {
1625			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1626		}
1627
1628		public boolean pep() {
1629			synchronized (XmppConnection.this.disco) {
1630				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1631				return info != null && info.hasIdentity("pubsub", "pep");
1632			}
1633		}
1634
1635		public boolean pepPersistent() {
1636			synchronized (XmppConnection.this.disco) {
1637				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1638				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1639			}
1640		}
1641
1642		public boolean mam() {
1643			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1644					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1645		}
1646
1647		public boolean mamLegacy() {
1648			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1649					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1650		}
1651
1652		public boolean push() {
1653			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1654					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1655		}
1656
1657		public boolean rosterVersioning() {
1658			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1659		}
1660
1661		public void setBlockListRequested(boolean value) {
1662			this.blockListRequested = value;
1663		}
1664
1665		public boolean httpUpload(long filesize) {
1666			if (Config.DISABLE_HTTP_UPLOAD) {
1667				return false;
1668			} else {
1669				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1670				if (items.size() > 0) {
1671					try {
1672						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1673						if(filesize <= maxsize) {
1674							return true;
1675						} else {
1676							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1677							return false;
1678						}
1679					} catch (Exception e) {
1680						return true;
1681					}
1682				} else {
1683					return false;
1684				}
1685			}
1686		}
1687
1688		public long getMaxHttpUploadSize() {
1689			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1690				if (items.size() > 0) {
1691					try {
1692						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1693					} catch (Exception e) {
1694						return -1;
1695					}
1696				} else {
1697					return -1;
1698				}
1699		}
1700
1701		public boolean stanzaIds() {
1702			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1703		}
1704	}
1705
1706	private IqGenerator getIqGenerator() {
1707		return mXmppConnectionService.getIqGenerator();
1708	}
1709}