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 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 XmppConnectionService mXmppConnectionService = null;
 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			return new String[0];
 165		}
 166
 167		@Override
 168		public String[] getServerAliases(String s, Principal[] principals) {
 169			return new String[0];
 170		}
 171
 172		@Override
 173		public PrivateKey getPrivateKey(String alias) {
 174			try {
 175				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 176			} catch (Exception e) {
 177				return null;
 178			}
 179		}
 180	}
 181
 182	public final OnIqPacketReceived registrationResponseListener =  new OnIqPacketReceived() {
 183		@Override
 184		public void onIqPacketReceived(Account account, IqPacket packet) {
 185			if (packet.getType() == IqPacket.TYPE.RESULT) {
 186				account.setOption(Account.OPTION_REGISTER, false);
 187				forceCloseSocket();
 188				changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 189			} else {
 190				final List<String> PASSWORD_TOO_WEAK_MSGS = Arrays.asList(
 191						"The password is too weak",
 192						"Please use a longer password.");
 193				Element error = packet.findChild("error");
 194				Account.State state = Account.State.REGISTRATION_FAILED;
 195				if (error != null) {
 196					if (error.hasChild("conflict")) {
 197						state = Account.State.REGISTRATION_CONFLICT;
 198					} else if (error.hasChild("resource-constraint")
 199							&& "wait".equals(error.getAttribute("type"))) {
 200						state = Account.State.REGISTRATION_PLEASE_WAIT;
 201					} else if (error.hasChild("not-acceptable")
 202							&& PASSWORD_TOO_WEAK_MSGS.contains(error.findChildContent("text"))) {
 203						state = Account.State.REGISTRATION_PASSWORD_TOO_WEAK;
 204					}
 205				}
 206				changeStatus(state);
 207				forceCloseSocket();
 208			}
 209		}
 210	};
 211
 212	public XmppConnection(final Account account, final XmppConnectionService service) {
 213		this.account = account;
 214		this.wakeLock = service.getPowerManager().newWakeLock(
 215				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 216		mXmppConnectionService = service;
 217	}
 218
 219	protected synchronized void changeStatus(final Account.State nextStatus) {
 220		if (Thread.currentThread().isInterrupted()) {
 221			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not changing status to "+nextStatus+" because thread was interrupted");
 222		}
 223		if (account.getStatus() != nextStatus) {
 224			if ((nextStatus == Account.State.OFFLINE)
 225					&& (account.getStatus() != Account.State.CONNECTING)
 226					&& (account.getStatus() != Account.State.ONLINE)
 227					&& (account.getStatus() != Account.State.DISABLED)) {
 228				return;
 229					}
 230			if (nextStatus == Account.State.ONLINE) {
 231				this.attempt = 0;
 232			}
 233			account.setStatus(nextStatus);
 234			if (statusListener != null) {
 235				statusListener.onStatusChanged(account);
 236			}
 237		}
 238	}
 239
 240	public void prepareNewConnection() {
 241		this.lastConnect = SystemClock.elapsedRealtime();
 242		this.lastPingSent = SystemClock.elapsedRealtime();
 243		this.lastDiscoStarted = Long.MAX_VALUE;
 244		this.mWaitingForSmCatchup.set(false);
 245		this.changeStatus(Account.State.CONNECTING);
 246	}
 247
 248	public boolean isWaitingForSmCatchup() {
 249		return mWaitingForSmCatchup.get();
 250	}
 251
 252	public void incrementSmCatchupMessageCounter() {
 253		this.mSmCatchupMessageCounter.incrementAndGet();
 254	}
 255
 256	protected void connect() {
 257		if (mXmppConnectionService.areMessagesInitialized()) {
 258			mXmppConnectionService.resetSendingToWaiting(account);
 259		}
 260		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 261		features.encryptionEnabled = false;
 262		this.attempt++;
 263		try {
 264			Socket localSocket;
 265			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 266			this.changeStatus(Account.State.CONNECTING);
 267			final boolean useTor = mXmppConnectionService.useTorToConnect() || account.isOnion();
 268			final boolean extended = mXmppConnectionService.showExtendedConnectionOptions();
 269			if (useTor) {
 270				String destination;
 271				if (account.getHostname() == null || account.getHostname().isEmpty()) {
 272					destination = account.getServer().toString();
 273				} else {
 274					destination = account.getHostname();
 275				}
 276				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": connect to " + destination + " via Tor");
 277				localSocket = SocksSocketFactory.createSocketOverTor(destination, account.getPort());
 278				try {
 279					startXmpp(localSocket);
 280				} catch (InterruptedException e) {
 281					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 282					return;
 283				} catch (Exception e) {
 284					throw new IOException(e.getMessage());
 285				}
 286			} else if (extended && account.getHostname() != null && !account.getHostname().isEmpty()) {
 287
 288				InetSocketAddress address = new InetSocketAddress(account.getHostname(), account.getPort());
 289
 290				features.encryptionEnabled = account.getPort() == 5223;
 291
 292				try {
 293					if (features.encryptionEnabled) {
 294						try {
 295							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 296							localSocket = tlsFactoryVerifier.factory.createSocket();
 297							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 298							final SSLSession session = ((SSLSocket) localSocket).getSession();
 299							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), session)) {
 300								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 301								throw new SecurityException();
 302							}
 303						} catch (KeyManagementException e) {
 304							features.encryptionEnabled = false;
 305							localSocket = new Socket();
 306						}
 307					} else {
 308						localSocket = new Socket();
 309						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 310					}
 311				} catch (IOException e) {
 312					throw new UnknownHostException();
 313				}
 314				try {
 315					startXmpp(localSocket);
 316				} catch (InterruptedException e) {
 317					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 318					return;
 319				} catch (Exception e) {
 320					throw new IOException(e.getMessage());
 321				}
 322			} else if (DNSHelper.isIp(account.getServer().toString())) {
 323				localSocket = new Socket();
 324				try {
 325					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 326				} catch (IOException e) {
 327					throw new UnknownHostException();
 328				}
 329				try {
 330					startXmpp(localSocket);
 331				} catch (InterruptedException e) {
 332					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 333					return;
 334				} catch (Exception e) {
 335					throw new IOException(e.getMessage());
 336				}
 337			} else {
 338				final Bundle result = DNSHelper.getSRVRecord(account.getServer(), mXmppConnectionService);
 339				final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
 340				for (Iterator<Parcelable> iterator = values.iterator(); iterator.hasNext(); ) {
 341					if (Thread.currentThread().isInterrupted()) {
 342						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 343						return;
 344					}
 345					final Bundle namePort = (Bundle) iterator.next();
 346					try {
 347						String srvRecordServer;
 348						try {
 349							srvRecordServer = IDN.toASCII(namePort.getString("name"));
 350						} catch (final IllegalArgumentException e) {
 351							// TODO: Handle me?`
 352							srvRecordServer = "";
 353						}
 354						final int srvRecordPort = namePort.getInt("port");
 355						final String srvIpServer = namePort.getString("ip");
 356						// if tls is true, encryption is implied and must not be started
 357						features.encryptionEnabled = namePort.getBoolean("tls");
 358						final InetSocketAddress addr;
 359						if (srvIpServer != null) {
 360							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
 361							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 362									+ ": using values from dns " + srvRecordServer
 363									+ "[" + srvIpServer + "]:" + srvRecordPort + " tls: " + features.encryptionEnabled);
 364						} else {
 365							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
 366							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 367									+ ": using values from dns "
 368									+ srvRecordServer + ":" + srvRecordPort + " tls: " + features.encryptionEnabled);
 369						}
 370
 371						if (!features.encryptionEnabled) {
 372							localSocket = new Socket();
 373							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 374						} else {
 375							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 376							localSocket = tlsFactoryVerifier.factory.createSocket();
 377
 378							if (localSocket == null) {
 379								throw new IOException("could not initialize ssl socket");
 380							}
 381
 382							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 383							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 384							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 385
 386							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 387
 388							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), ((SSLSocket) localSocket).getSession())) {
 389								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 390								throw new SecurityException();
 391							}
 392						}
 393						if (startXmpp(localSocket)) {
 394							break; // successfully connected to server that speaks xmpp
 395						} else {
 396							localSocket.close();
 397						}
 398					} catch (final SecurityException e) {
 399						throw e;
 400					} catch (InterruptedException e) {
 401						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 402						return;
 403					} catch (final Throwable e) {
 404						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 405						if (!iterator.hasNext()) {
 406							throw new UnknownHostException();
 407						}
 408					}
 409				}
 410			}
 411			processStream();
 412		}  catch (final java.lang.SecurityException e) {
 413			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 414		} catch (final RegistrationNotSupportedException e) {
 415			this.changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
 416		} catch (final IncompatibleServerException e) {
 417			this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
 418		} catch (final SecurityException e) {
 419			this.changeStatus(Account.State.SECURITY_ERROR);
 420		} catch (final UnauthorizedException e) {
 421			this.changeStatus(Account.State.UNAUTHORIZED);
 422		} catch (final PaymentRequiredException e) {
 423			this.changeStatus(Account.State.PAYMENT_REQUIRED);
 424		} catch (final UnknownHostException | ConnectException e) {
 425			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 426		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 427			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 428		} catch(final StreamErrorHostUnknown e) {
 429			this.changeStatus(Account.State.HOST_UNKNOWN);
 430		} catch(final StreamErrorPolicyViolation e) {
 431			this.changeStatus(Account.State.POLICY_VIOLATION);
 432		} catch(final StreamError e) {
 433			this.changeStatus(Account.State.STREAM_ERROR);
 434		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 435			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 436			this.changeStatus(Account.State.OFFLINE);
 437			this.attempt = Math.max(0, this.attempt - 1);
 438		} finally {
 439			if (!Thread.currentThread().isInterrupted()) {
 440				forceCloseSocket();
 441				if (wakeLock.isHeld()) {
 442					try {
 443						wakeLock.release();
 444					} catch (final RuntimeException ignored) {
 445					}
 446				}
 447			} else {
 448				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock because thread was interrupted");
 449			}
 450		}
 451	}
 452
 453	/**
 454	 * Starts xmpp protocol, call after connecting to socket
 455	 * @return true if server returns with valid xmpp, false otherwise
 456     */
 457	private boolean startXmpp(Socket socket) throws Exception {
 458		if (Thread.currentThread().isInterrupted()) {
 459			throw new InterruptedException();
 460		}
 461		this.socket = socket;
 462		tagReader = new XmlReader(wakeLock);
 463		if (tagWriter != null) {
 464			tagWriter.forceClose();
 465		}
 466		tagWriter = new TagWriter();
 467		tagWriter.setOutputStream(socket.getOutputStream());
 468		tagReader.setInputStream(socket.getInputStream());
 469		tagWriter.beginDocument();
 470		sendStartStream();
 471		final Tag tag = tagReader.readTag();
 472		return tag != null && tag.isStart("stream");
 473	}
 474
 475	private static class TlsFactoryVerifier {
 476		private final SSLSocketFactory factory;
 477		private final HostnameVerifier verifier;
 478
 479		public TlsFactoryVerifier(final SSLSocketFactory factory, final HostnameVerifier verifier) throws IOException {
 480			this.factory = factory;
 481			this.verifier = verifier;
 482			if (factory == null || verifier == null) {
 483				throw new IOException("could not setup ssl");
 484			}
 485		}
 486	}
 487
 488	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 489		final SSLContext sc = SSLSocketHelper.getSSLContext();
 490		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 491		KeyManager[] keyManager;
 492		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 493			keyManager = new KeyManager[]{new MyKeyManager()};
 494		} else {
 495			keyManager = null;
 496		}
 497		String domain = account.getJid().getDomainpart();
 498		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 499		final SSLSocketFactory factory = sc.getSocketFactory();
 500		final HostnameVerifier verifier;
 501		if (mInteractive) {
 502			verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier());
 503		} else {
 504			verifier = trustManager.wrapHostnameVerifierNonInteractive(new XmppDomainVerifier());
 505		}
 506
 507		return new TlsFactoryVerifier(factory, verifier);
 508	}
 509
 510	@Override
 511	public void run() {
 512		forceCloseSocket();
 513		connect();
 514	}
 515
 516	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 517		Tag nextTag = tagReader.readTag();
 518		while (nextTag != null && !nextTag.isEnd("stream")) {
 519			if (nextTag.isStart("error")) {
 520				processStreamError(nextTag);
 521			} else if (nextTag.isStart("features")) {
 522				processStreamFeatures(nextTag);
 523			} else if (nextTag.isStart("proceed")) {
 524				switchOverToTls(nextTag);
 525			} else if (nextTag.isStart("success")) {
 526				final String challenge = tagReader.readElement(nextTag).getContent();
 527				try {
 528					saslMechanism.getResponse(challenge);
 529				} catch (final SaslMechanism.AuthenticationException e) {
 530					disconnect(true);
 531					Log.e(Config.LOGTAG, String.valueOf(e));
 532				}
 533				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 534				account.setKey(Account.PINNED_MECHANISM_KEY,
 535						String.valueOf(saslMechanism.getPriority()));
 536				tagReader.reset();
 537				sendStartStream();
 538				final Tag tag = tagReader.readTag();
 539				if (tag != null && tag.isStart("stream")) {
 540					processStream();
 541				} else {
 542					throw new IOException("server didn't restart stream after successful auth");
 543				}
 544				break;
 545			} else if (nextTag.isStart("failure")) {
 546				final Element failure = tagReader.readElement(nextTag);
 547				final String text = failure.findChildContent("text");
 548				if (failure.hasChild("account-disabled")
 549						&& text != null
 550						&& text.contains("renew")
 551						&& Config.MAGIC_CREATE_DOMAIN != null
 552						&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 553					throw new PaymentRequiredException();
 554				} else {
 555					throw new UnauthorizedException();
 556				}
 557			} else if (nextTag.isStart("challenge")) {
 558				final String challenge = tagReader.readElement(nextTag).getContent();
 559				final Element response = new Element("response");
 560				response.setAttribute("xmlns",
 561						"urn:ietf:params:xml:ns:xmpp-sasl");
 562				try {
 563					response.setContent(saslMechanism.getResponse(challenge));
 564				} catch (final SaslMechanism.AuthenticationException e) {
 565					// TODO: Send auth abort tag.
 566					Log.e(Config.LOGTAG, e.toString());
 567				}
 568				tagWriter.writeElement(response);
 569			} else if (nextTag.isStart("enabled")) {
 570				final Element enabled = tagReader.readElement(nextTag);
 571				if ("true".equals(enabled.getAttribute("resume"))) {
 572					this.streamId = enabled.getAttribute("id");
 573					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 574							+ ": stream management(" + smVersion
 575							+ ") enabled (resumable)");
 576				} else {
 577					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 578							+ ": stream management(" + smVersion + ") enabled");
 579				}
 580				this.stanzasReceived = 0;
 581				final RequestPacket r = new RequestPacket(smVersion);
 582				tagWriter.writeStanzaAsync(r);
 583			} else if (nextTag.isStart("resumed")) {
 584				lastPacketReceived = SystemClock.elapsedRealtime();
 585				final Element resumed = tagReader.readElement(nextTag);
 586				final String h = resumed.getAttribute("h");
 587				try {
 588					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 589					synchronized (this.mStanzaQueue) {
 590						final int serverCount = Integer.parseInt(h);
 591						if (serverCount != stanzasSent) {
 592							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 593									+ ": session resumed with lost packages");
 594							stanzasSent = serverCount;
 595						} else {
 596							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 597						}
 598						acknowledgeStanzaUpTo(serverCount);
 599						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 600							failedStanzas.add(mStanzaQueue.valueAt(i));
 601						}
 602						mStanzaQueue.clear();
 603					}
 604					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 605					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 606						if (packet instanceof MessagePacket) {
 607							MessagePacket message = (MessagePacket) packet;
 608							mXmppConnectionService.markMessage(account,
 609									message.getTo().toBareJid(),
 610									message.getId(),
 611									Message.STATUS_UNSEND);
 612						}
 613						sendPacket(packet);
 614					}
 615				} catch (final NumberFormatException ignored) {
 616				}
 617				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 618				changeStatus(Account.State.ONLINE);
 619			} else if (nextTag.isStart("r")) {
 620				tagReader.readElement(nextTag);
 621				if (Config.EXTENDED_SM_LOGGING) {
 622					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 623				}
 624				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 625				tagWriter.writeStanzaAsync(ack);
 626			} else if (nextTag.isStart("a")) {
 627				if (mWaitingForSmCatchup.compareAndSet(true,false)) {
 628					int count = mSmCatchupMessageCounter.get();
 629					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": SM catchup complete ("+count+")");
 630					if (count > 0) {
 631						mXmppConnectionService.getNotificationService().finishBacklog(true,account);
 632					}
 633				}
 634				final Element ack = tagReader.readElement(nextTag);
 635				lastPacketReceived = SystemClock.elapsedRealtime();
 636				try {
 637					synchronized (this.mStanzaQueue) {
 638						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 639						acknowledgeStanzaUpTo(serverSequence);
 640					}
 641				} catch (NumberFormatException | NullPointerException e) {
 642					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 643				}
 644			} else if (nextTag.isStart("failed")) {
 645				Element failed = tagReader.readElement(nextTag);
 646				try {
 647					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 648					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 649					synchronized (this.mStanzaQueue) {
 650						acknowledgeStanzaUpTo(serverCount);
 651					}
 652				} catch (NumberFormatException | NullPointerException e) {
 653					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 654				}
 655				resetStreamId();
 656				if (account.getStatus() != Account.State.ONLINE) {
 657					sendBindRequest();
 658				}
 659			} else if (nextTag.isStart("iq")) {
 660				processIq(nextTag);
 661			} else if (nextTag.isStart("message")) {
 662				processMessage(nextTag);
 663			} else if (nextTag.isStart("presence")) {
 664				processPresence(nextTag);
 665			}
 666			nextTag = tagReader.readTag();
 667		}
 668	}
 669
 670	private void acknowledgeStanzaUpTo(int serverCount) {
 671		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 672			if (serverCount >= mStanzaQueue.keyAt(i)) {
 673				if (Config.EXTENDED_SM_LOGGING) {
 674					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 675				}
 676				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 677				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 678					MessagePacket packet = (MessagePacket) stanza;
 679					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 680				}
 681				mStanzaQueue.removeAt(i);
 682				i--;
 683			}
 684		}
 685	}
 686
 687	private Element processPacket(final Tag currentTag, final int packetType)
 688		throws XmlPullParserException, IOException {
 689		Element element;
 690		switch (packetType) {
 691			case PACKET_IQ:
 692				element = new IqPacket();
 693				break;
 694			case PACKET_MESSAGE:
 695				element = new MessagePacket();
 696				break;
 697			case PACKET_PRESENCE:
 698				element = new PresencePacket();
 699				break;
 700			default:
 701				return null;
 702		}
 703		element.setAttributes(currentTag.getAttributes());
 704		Tag nextTag = tagReader.readTag();
 705		if (nextTag == null) {
 706			throw new IOException("interrupted mid tag");
 707		}
 708		while (!nextTag.isEnd(element.getName())) {
 709			if (!nextTag.isNo()) {
 710				final Element child = tagReader.readElement(nextTag);
 711				final String type = currentTag.getAttribute("type");
 712				if (packetType == PACKET_IQ
 713						&& "jingle".equals(child.getName())
 714						&& ("set".equalsIgnoreCase(type) || "get"
 715							.equalsIgnoreCase(type))) {
 716					element = new JinglePacket();
 717					element.setAttributes(currentTag.getAttributes());
 718							}
 719				element.addChild(child);
 720			}
 721			nextTag = tagReader.readTag();
 722			if (nextTag == null) {
 723				throw new IOException("interrupted mid tag");
 724			}
 725		}
 726		if (stanzasReceived == Integer.MAX_VALUE) {
 727			resetStreamId();
 728			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 729		}
 730		++stanzasReceived;
 731		lastPacketReceived = SystemClock.elapsedRealtime();
 732		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 733			Log.d(Config.LOGTAG,"[background stanza] "+element);
 734		}
 735		return element;
 736	}
 737
 738	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 739		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 740
 741		if (packet.getId() == null) {
 742			return; // an iq packet without id is definitely invalid
 743		}
 744
 745		if (packet instanceof JinglePacket) {
 746			if (this.jingleListener != null) {
 747				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 748			}
 749		} else {
 750			OnIqPacketReceived callback = null;
 751			synchronized (this.packetCallbacks) {
 752				if (packetCallbacks.containsKey(packet.getId())) {
 753					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 754					// Packets to the server should have responses from the server
 755					if (packetCallbackDuple.first.toServer(account)) {
 756						if (packet.fromServer(account)) {
 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					} else {
 763						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 764							callback = packetCallbackDuple.second;
 765							packetCallbacks.remove(packet.getId());
 766						} else {
 767							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 768						}
 769					}
 770				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 771					callback = this.unregisteredIqListener;
 772				}
 773			}
 774			if (callback != null) {
 775				callback.onIqPacketReceived(account,packet);
 776			}
 777		}
 778	}
 779
 780	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 781		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 782		this.messageListener.onMessagePacketReceived(account, packet);
 783	}
 784
 785	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 786		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 787		this.presenceListener.onPresencePacketReceived(account, packet);
 788	}
 789
 790	private void sendStartTLS() throws IOException {
 791		final Tag startTLS = Tag.empty("starttls");
 792		startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
 793		tagWriter.writeTag(startTLS);
 794	}
 795
 796
 797
 798	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 799		tagReader.readTag();
 800		try {
 801			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 802			final InetAddress address = socket == null ? null : socket.getInetAddress();
 803
 804			if (address == null) {
 805				throw new IOException("could not setup ssl");
 806			}
 807
 808			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 809
 810			if (sslSocket == null) {
 811				throw new IOException("could not initialize ssl socket");
 812			}
 813
 814			SSLSocketHelper.setSecurity(sslSocket);
 815
 816			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), sslSocket.getSession())) {
 817				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 818				throw new SecurityException();
 819			}
 820			tagReader.setInputStream(sslSocket.getInputStream());
 821			tagWriter.setOutputStream(sslSocket.getOutputStream());
 822			sendStartStream();
 823			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 824			features.encryptionEnabled = true;
 825			final Tag tag = tagReader.readTag();
 826			if (tag != null && tag.isStart("stream")) {
 827				processStream();
 828			} else {
 829				throw new IOException("server didn't restart stream after STARTTLS");
 830			}
 831			sslSocket.close();
 832		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 833			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 834			throw new SecurityException();
 835		}
 836	}
 837
 838	private void processStreamFeatures(final Tag currentTag)
 839		throws XmlPullParserException, IOException {
 840		this.streamFeatures = tagReader.readElement(currentTag);
 841		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 842			sendStartTLS();
 843		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 844			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 845				sendRegistryRequest();
 846			} else {
 847				throw new IncompatibleServerException();
 848			}
 849		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 850			throw new RegistrationNotSupportedException();
 851		} else if (this.streamFeatures.hasChild("mechanisms")
 852				&& shouldAuthenticate
 853				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 854			authenticate();
 855		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 856			if (Config.EXTENDED_SM_LOGGING) {
 857				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 858			}
 859			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 860			this.mSmCatchupMessageCounter.set(0);
 861			this.mWaitingForSmCatchup.set(true);
 862			this.tagWriter.writeStanzaAsync(resume);
 863			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 864		} else if (needsBinding) {
 865			if (this.streamFeatures.hasChild("bind")) {
 866				sendBindRequest();
 867			} else {
 868				throw new IncompatibleServerException();
 869			}
 870		}
 871	}
 872
 873	private void authenticate() throws IOException {
 874		final List<String> mechanisms = extractMechanisms(streamFeatures
 875				.findChild("mechanisms"));
 876		final Element auth = new Element("auth");
 877		auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
 878		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 879			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 880		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 881			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 882		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 883			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 884		} else if (mechanisms.contains("PLAIN")) {
 885			saslMechanism = new Plain(tagWriter, account);
 886		} else if (mechanisms.contains("DIGEST-MD5")) {
 887			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 888		} else if (mechanisms.contains("ANONYMOUS")) {
 889			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 890		}
 891		if (saslMechanism != null) {
 892			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 893			if (pinnedMechanism > saslMechanism.getPriority()) {
 894				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 895						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 896						") than pinned priority (" + pinnedMechanism +
 897						"). Possible downgrade attack?");
 898				throw new SecurityException();
 899			}
 900			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 901			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 902			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 903				auth.setContent(saslMechanism.getClientFirstMessage());
 904			}
 905			tagWriter.writeElement(auth);
 906		} else {
 907			throw new IncompatibleServerException();
 908		}
 909	}
 910
 911	private List<String> extractMechanisms(final Element stream) {
 912		final ArrayList<String> mechanisms = new ArrayList<>(stream
 913				.getChildren().size());
 914		for (final Element child : stream.getChildren()) {
 915			mechanisms.add(child.getContent());
 916		}
 917		return mechanisms;
 918	}
 919
 920	private void sendRegistryRequest() {
 921		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 922		register.query("jabber:iq:register");
 923		register.setTo(account.getServer());
 924		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 925
 926			@Override
 927			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 928				boolean failed = false;
 929				if (packet.getType() == IqPacket.TYPE.RESULT
 930						&& packet.query().hasChild("username")
 931						&& (packet.query().hasChild("password"))) {
 932					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 933					final Element username = new Element("username").setContent(account.getUsername());
 934					final Element password = new Element("password").setContent(account.getPassword());
 935					register.query("jabber:iq:register").addChild(username);
 936					register.query().addChild(password);
 937					register.setFrom(account.getJid().toBareJid());
 938					sendUnmodifiedIqPacket(register, registrationResponseListener);
 939				} else if (packet.getType() == IqPacket.TYPE.RESULT
 940						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 941					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 942					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 943					final String id = packet.getId();
 944
 945					Bitmap captcha = null;
 946					if (blob != null) {
 947						try {
 948							final String base64Blob = blob.getContent();
 949							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 950							InputStream stream = new ByteArrayInputStream(strBlob);
 951							captcha = BitmapFactory.decodeStream(stream);
 952						} catch (Exception e) {
 953							//ignored
 954						}
 955					} else {
 956						try {
 957							Field url = data.getFieldByName("url");
 958							String urlString = url.findChildContent("value");
 959							URL uri = new URL(urlString);
 960							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 961						} catch (IOException e) {
 962							Log.e(Config.LOGTAG, e.toString());
 963						}
 964					}
 965
 966					if (captcha != null) {
 967						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 968					}
 969				} else {
 970					failed = true;
 971				}
 972
 973				if (failed) {
 974					final Element instructions = packet.query().findChild("instructions");
 975					setAccountCreationFailed((instructions != null) ? instructions.getContent() : "");
 976				}
 977			}
 978		});
 979	}
 980
 981	private void setAccountCreationFailed(String instructions) {
 982		changeStatus(Account.State.REGISTRATION_FAILED);
 983		disconnect(true);
 984		Log.d(Config.LOGTAG, account.getJid().toBareJid()
 985				+ ": could not register. instructions are"
 986				+ instructions);
 987	}
 988
 989	public void resetEverything() {
 990		resetAttemptCount(true);
 991		resetStreamId();
 992		clearIqCallbacks();
 993		mStanzaQueue.clear();
 994		synchronized (this.disco) {
 995			disco.clear();
 996		}
 997	}
 998
 999	private void sendBindRequest() {
1000		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
1001			try {
1002				Thread.sleep(500);
1003			} catch (final InterruptedException ignored) {
1004			}
1005		}
1006		needsBinding = false;
1007		clearIqCallbacks();
1008		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1009		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1010				.addChild("resource").setContent(account.getResource());
1011		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1012			@Override
1013			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1014				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1015					return;
1016				}
1017				final Element bind = packet.findChild("bind");
1018				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1019					final Element jid = bind.findChild("jid");
1020					if (jid != null && jid.getContent() != null) {
1021						try {
1022							if (account.setJid(Jid.fromString(jid.getContent()))) {
1023								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1024								mXmppConnectionService.databaseBackend.updateAccount(account);
1025							}
1026							if (streamFeatures.hasChild("session")
1027									&& !streamFeatures.findChild("session").hasChild("optional")) {
1028								sendStartSession();
1029							} else {
1030								sendPostBindInitialization();
1031							}
1032							return;
1033						} catch (final InvalidJidException e) {
1034							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1035						}
1036					} else {
1037						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1038					}
1039				} else {
1040					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1041				}
1042				forceCloseSocket();
1043				changeStatus(Account.State.BIND_FAILURE);
1044			}
1045		});
1046	}
1047
1048	private void clearIqCallbacks() {
1049		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1050		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1051		synchronized (this.packetCallbacks) {
1052			if (this.packetCallbacks.size() == 0) {
1053				return;
1054			}
1055			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1056			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1057			while (iterator.hasNext()) {
1058				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1059				callbacks.add(entry.second);
1060				iterator.remove();
1061			}
1062		}
1063		for(OnIqPacketReceived callback : callbacks) {
1064			callback.onIqPacketReceived(account,failurePacket);
1065		}
1066		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1067	}
1068
1069	public void sendDiscoTimeout() {
1070		if (mWaitForDisco.compareAndSet(true, false)) {
1071			finalizeBind();
1072		}
1073	}
1074
1075	private void sendStartSession() {
1076		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1077		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1078		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1079		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1080			@Override
1081			public void onIqPacketReceived(Account account, IqPacket packet) {
1082				if (packet.getType() == IqPacket.TYPE.RESULT) {
1083					sendPostBindInitialization();
1084				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1085					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not init sessions");
1086					disconnect(true);
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 StreamErrorHostUnknown();
1267		} else if (streamError.hasChild("policy-violation")) {
1268			throw new StreamErrorPolicyViolation();
1269		} else {
1270			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1271			throw new StreamError();
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 UnauthorizedException extends IOException {
1562
1563	}
1564
1565	private class SecurityException extends IOException {
1566
1567	}
1568
1569	private class IncompatibleServerException extends IOException {
1570
1571	}
1572
1573	private class StreamErrorHostUnknown extends StreamError {
1574
1575	}
1576
1577	private class StreamErrorPolicyViolation extends StreamError {
1578
1579	}
1580
1581	private class StreamError extends IOException {
1582
1583	}
1584
1585	private class PaymentRequiredException extends IOException {
1586
1587	}
1588
1589	private class RegistrationNotSupportedException extends IOException {
1590
1591	}
1592
1593	public enum Identity {
1594		FACEBOOK,
1595		SLACK,
1596		EJABBERD,
1597		PROSODY,
1598		NIMBUZZ,
1599		UNKNOWN
1600	}
1601
1602	public class Features {
1603		XmppConnection connection;
1604		private boolean carbonsEnabled = false;
1605		private boolean encryptionEnabled = false;
1606		private boolean blockListRequested = false;
1607
1608		public Features(final XmppConnection connection) {
1609			this.connection = connection;
1610		}
1611
1612		private boolean hasDiscoFeature(final Jid server, final String feature) {
1613			synchronized (XmppConnection.this.disco) {
1614				return connection.disco.containsKey(server) &&
1615						connection.disco.get(server).getFeatures().contains(feature);
1616			}
1617		}
1618
1619		public boolean carbons() {
1620			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1621		}
1622
1623		public boolean blocking() {
1624			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1625		}
1626
1627		public boolean spamReporting() {
1628			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1629		}
1630
1631		public boolean register() {
1632			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1633		}
1634
1635		public boolean sm() {
1636			return streamId != null
1637					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1638		}
1639
1640		public boolean csi() {
1641			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1642		}
1643
1644		public boolean pep() {
1645			synchronized (XmppConnection.this.disco) {
1646				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1647				return info != null && info.hasIdentity("pubsub", "pep");
1648			}
1649		}
1650
1651		public boolean pepPersistent() {
1652			synchronized (XmppConnection.this.disco) {
1653				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1654				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1655			}
1656		}
1657
1658		public boolean mam() {
1659			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1660					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1661		}
1662
1663		public boolean mamLegacy() {
1664			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1665					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1666		}
1667
1668		public boolean push() {
1669			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1670					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1671		}
1672
1673		public boolean rosterVersioning() {
1674			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1675		}
1676
1677		public void setBlockListRequested(boolean value) {
1678			this.blockListRequested = value;
1679		}
1680
1681		public boolean httpUpload(long filesize) {
1682			if (Config.DISABLE_HTTP_UPLOAD) {
1683				return false;
1684			} else {
1685				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1686				if (items.size() > 0) {
1687					try {
1688						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1689						if(filesize <= maxsize) {
1690							return true;
1691						} else {
1692							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1693							return false;
1694						}
1695					} catch (Exception e) {
1696						return true;
1697					}
1698				} else {
1699					return false;
1700				}
1701			}
1702		}
1703
1704		public long getMaxHttpUploadSize() {
1705			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1706				if (items.size() > 0) {
1707					try {
1708						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1709					} catch (Exception e) {
1710						return -1;
1711					}
1712				} else {
1713					return -1;
1714				}
1715		}
1716
1717		public boolean stanzaIds() {
1718			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1719		}
1720	}
1721
1722	private IqGenerator getIqGenerator() {
1723		return mXmppConnectionService.getIqGenerator();
1724	}
1725}