1package eu.siacs.conversations.xmpp;
   2
   3import android.graphics.Bitmap;
   4import android.graphics.BitmapFactory;
   5import android.os.PowerManager;
   6import android.os.PowerManager.WakeLock;
   7import android.os.SystemClock;
   8import android.security.KeyChain;
   9import android.util.Base64;
  10import android.util.Log;
  11import android.util.Pair;
  12import android.util.SparseArray;
  13
  14import org.xmlpull.v1.XmlPullParserException;
  15
  16import java.io.ByteArrayInputStream;
  17import java.io.IOException;
  18import java.io.InputStream;
  19import java.math.BigInteger;
  20import java.net.ConnectException;
  21import java.net.IDN;
  22import java.net.InetAddress;
  23import java.net.InetSocketAddress;
  24import java.net.Socket;
  25import java.net.URL;
  26import java.net.UnknownHostException;
  27import java.security.KeyManagementException;
  28import java.security.NoSuchAlgorithmException;
  29import java.security.Principal;
  30import java.security.PrivateKey;
  31import java.security.cert.X509Certificate;
  32import java.util.ArrayList;
  33import java.util.Arrays;
  34import java.util.HashMap;
  35import java.util.HashSet;
  36import java.util.Hashtable;
  37import java.util.Iterator;
  38import java.util.List;
  39import java.util.Map.Entry;
  40import java.util.concurrent.atomic.AtomicBoolean;
  41import java.util.concurrent.atomic.AtomicInteger;
  42import java.util.regex.Matcher;
  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.DomainHostnameVerifier;
  54import de.duenndns.ssl.MemorizingTrustManager;
  55import eu.siacs.conversations.Config;
  56import eu.siacs.conversations.crypto.XmppDomainVerifier;
  57import eu.siacs.conversations.crypto.sasl.Anonymous;
  58import eu.siacs.conversations.crypto.sasl.DigestMd5;
  59import eu.siacs.conversations.crypto.sasl.External;
  60import eu.siacs.conversations.crypto.sasl.Plain;
  61import eu.siacs.conversations.crypto.sasl.SaslMechanism;
  62import eu.siacs.conversations.crypto.sasl.ScramSha1;
  63import eu.siacs.conversations.crypto.sasl.ScramSha256;
  64import eu.siacs.conversations.entities.Account;
  65import eu.siacs.conversations.entities.Message;
  66import eu.siacs.conversations.entities.ServiceDiscoveryResult;
  67import eu.siacs.conversations.generator.IqGenerator;
  68import eu.siacs.conversations.services.NotificationService;
  69import eu.siacs.conversations.services.XmppConnectionService;
  70import eu.siacs.conversations.utils.IP;
  71import eu.siacs.conversations.utils.Patterns;
  72import eu.siacs.conversations.utils.Resolver;
  73import eu.siacs.conversations.utils.SSLSocketHelper;
  74import eu.siacs.conversations.utils.SocksSocketFactory;
  75import eu.siacs.conversations.xml.Element;
  76import eu.siacs.conversations.xml.Tag;
  77import eu.siacs.conversations.xml.TagWriter;
  78import eu.siacs.conversations.xml.XmlReader;
  79import eu.siacs.conversations.xml.Namespace;
  80import eu.siacs.conversations.xmpp.forms.Data;
  81import eu.siacs.conversations.xmpp.forms.Field;
  82import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  83import eu.siacs.conversations.xmpp.jid.Jid;
  84import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
  85import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
  86import eu.siacs.conversations.xmpp.stanzas.AbstractAcknowledgeableStanza;
  87import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
  88import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  89import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  90import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
  91import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
  92import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
  93import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
  94import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
  95import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
  96import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
  97
  98public class XmppConnection implements Runnable {
  99
 100	private static final int PACKET_IQ = 0;
 101	private static final int PACKET_MESSAGE = 1;
 102	private static final int PACKET_PRESENCE = 2;
 103	protected final Account account;
 104	private final WakeLock wakeLock;
 105	private Socket socket;
 106	private XmlReader tagReader;
 107	private TagWriter tagWriter = new TagWriter();
 108	private final Features features = new Features(this);
 109	private boolean needsBinding = true;
 110	private boolean shouldAuthenticate = true;
 111	private Element streamFeatures;
 112	private final HashMap<Jid, ServiceDiscoveryResult> disco = new HashMap<>();
 113
 114	private String streamId = null;
 115	private int smVersion = 3;
 116	private final SparseArray<AbstractAcknowledgeableStanza> mStanzaQueue = new SparseArray<>();
 117
 118	private int stanzasReceived = 0;
 119	private int stanzasSent = 0;
 120	private long lastPacketReceived = 0;
 121	private long lastPingSent = 0;
 122	private long lastConnect = 0;
 123	private long lastSessionStarted = 0;
 124	private long lastDiscoStarted = 0;
 125	private AtomicInteger mPendingServiceDiscoveries = new AtomicInteger(0);
 126	private AtomicBoolean mWaitForDisco = new AtomicBoolean(true);
 127	private AtomicBoolean mWaitingForSmCatchup = new AtomicBoolean(false);
 128	private AtomicInteger mSmCatchupMessageCounter = new AtomicInteger(0);
 129	private boolean mInteractive = false;
 130	private int attempt = 0;
 131	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 132	private OnPresencePacketReceived presenceListener = null;
 133	private OnJinglePacketReceived jingleListener = null;
 134	private OnIqPacketReceived unregisteredIqListener = null;
 135	private OnMessagePacketReceived messageListener = null;
 136	private OnStatusChanged statusListener = null;
 137	private OnBindListener bindListener = null;
 138	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 139	private OnMessageAcknowledged acknowledgedListener = null;
 140	private final XmppConnectionService mXmppConnectionService;
 141
 142	private SaslMechanism saslMechanism;
 143	private String webRegistrationUrl = null;
 144	private String verifiedHostname = null;
 145
 146	private class MyKeyManager implements X509KeyManager {
 147		@Override
 148		public String chooseClientAlias(String[] strings, Principal[] principals, Socket socket) {
 149			return account.getPrivateKeyAlias();
 150		}
 151
 152		@Override
 153		public String chooseServerAlias(String s, Principal[] principals, Socket socket) {
 154			return null;
 155		}
 156
 157		@Override
 158		public X509Certificate[] getCertificateChain(String alias) {
 159			Log.d(Config.LOGTAG,"getting certificate chain");
 160			try {
 161				return KeyChain.getCertificateChain(mXmppConnectionService, alias);
 162			} catch (Exception e) {
 163				Log.d(Config.LOGTAG,e.getMessage());
 164				return new X509Certificate[0];
 165			}
 166		}
 167
 168		@Override
 169		public String[] getClientAliases(String s, Principal[] principals) {
 170			final String alias = account.getPrivateKeyAlias();
 171			return alias != null ? new String[]{alias} : new String[0];
 172		}
 173
 174		@Override
 175		public String[] getServerAliases(String s, Principal[] principals) {
 176			return new String[0];
 177		}
 178
 179		@Override
 180		public PrivateKey getPrivateKey(String alias) {
 181			try {
 182				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 183			} catch (Exception e) {
 184				return null;
 185			}
 186		}
 187	}
 188
 189	public final OnIqPacketReceived registrationResponseListener =  new OnIqPacketReceived() {
 190		@Override
 191		public void onIqPacketReceived(Account account, IqPacket packet) {
 192			if (packet.getType() == IqPacket.TYPE.RESULT) {
 193				account.setOption(Account.OPTION_REGISTER, false);
 194				forceCloseSocket();
 195				changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 196			} else {
 197				final List<String> PASSWORD_TOO_WEAK_MSGS = Arrays.asList(
 198						"The password is too weak",
 199						"Please use a longer password.");
 200				Element error = packet.findChild("error");
 201				Account.State state = Account.State.REGISTRATION_FAILED;
 202				if (error != null) {
 203					if (error.hasChild("conflict")) {
 204						state = Account.State.REGISTRATION_CONFLICT;
 205					} else if (error.hasChild("resource-constraint")
 206							&& "wait".equals(error.getAttribute("type"))) {
 207						state = Account.State.REGISTRATION_PLEASE_WAIT;
 208					} else if (error.hasChild("not-acceptable")
 209							&& PASSWORD_TOO_WEAK_MSGS.contains(error.findChildContent("text"))) {
 210						state = Account.State.REGISTRATION_PASSWORD_TOO_WEAK;
 211					}
 212				}
 213				changeStatus(state);
 214				forceCloseSocket();
 215			}
 216		}
 217	};
 218
 219	public XmppConnection(final Account account, final XmppConnectionService service) {
 220		this.account = account;
 221		this.wakeLock = service.getPowerManager().newWakeLock(
 222				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 223		mXmppConnectionService = service;
 224	}
 225
 226	protected void changeStatus(final Account.State nextStatus) {
 227		synchronized (this) {
 228			if (Thread.currentThread().isInterrupted()) {
 229				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": not changing status to " + nextStatus + " because thread was interrupted");
 230				return;
 231			}
 232			if (account.getStatus() != nextStatus) {
 233				if ((nextStatus == Account.State.OFFLINE)
 234						&& (account.getStatus() != Account.State.CONNECTING)
 235						&& (account.getStatus() != Account.State.ONLINE)
 236						&& (account.getStatus() != Account.State.DISABLED)) {
 237					return;
 238				}
 239				if (nextStatus == Account.State.ONLINE) {
 240					this.attempt = 0;
 241				}
 242				account.setStatus(nextStatus);
 243			} else {
 244				return;
 245			}
 246		}
 247		if (statusListener != null) {
 248			statusListener.onStatusChanged(account);
 249		}
 250	}
 251
 252	public void prepareNewConnection() {
 253		this.lastConnect = SystemClock.elapsedRealtime();
 254		this.lastPingSent = SystemClock.elapsedRealtime();
 255		this.lastDiscoStarted = Long.MAX_VALUE;
 256		this.mWaitingForSmCatchup.set(false);
 257		this.changeStatus(Account.State.CONNECTING);
 258	}
 259
 260	public boolean isWaitingForSmCatchup() {
 261		return mWaitingForSmCatchup.get();
 262	}
 263
 264	public void incrementSmCatchupMessageCounter() {
 265		this.mSmCatchupMessageCounter.incrementAndGet();
 266	}
 267
 268	protected void connect() {
 269		if (mXmppConnectionService.areMessagesInitialized()) {
 270			mXmppConnectionService.resetSendingToWaiting(account);
 271		}
 272		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 273		features.encryptionEnabled = false;
 274		this.attempt++;
 275		this.verifiedHostname = null; //will be set if user entered hostname is being used or hostname was verified with dnssec
 276		try {
 277			Socket localSocket;
 278			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 279			this.changeStatus(Account.State.CONNECTING);
 280			final boolean useTor = mXmppConnectionService.useTorToConnect() || account.isOnion();
 281			final boolean extended = mXmppConnectionService.showExtendedConnectionOptions();
 282			if (useTor) {
 283				String destination;
 284				if (account.getHostname().isEmpty()) {
 285					destination = account.getServer().toString();
 286				} else {
 287					destination = account.getHostname();
 288					this.verifiedHostname = destination;
 289				}
 290				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": connect to " + destination + " via Tor");
 291				localSocket = SocksSocketFactory.createSocketOverTor(destination, account.getPort());
 292				try {
 293					startXmpp(localSocket);
 294				} catch (InterruptedException e) {
 295					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 296					return;
 297				} catch (Exception e) {
 298					throw new IOException(e.getMessage());
 299				}
 300			} else if (extended && !account.getHostname().isEmpty()) {
 301
 302				this.verifiedHostname = account.getHostname();
 303
 304				InetSocketAddress address = new InetSocketAddress(this.verifiedHostname, account.getPort());
 305
 306				features.encryptionEnabled = account.getPort() == 5223;
 307
 308				try {
 309					if (features.encryptionEnabled) {
 310						try {
 311							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 312							localSocket = tlsFactoryVerifier.factory.createSocket();
 313							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 314							final SSLSession session = ((SSLSocket) localSocket).getSession();
 315							final String domain = account.getJid().getDomainpart();
 316							if (!tlsFactoryVerifier.verifier.verify(domain, this.verifiedHostname, session)) {
 317								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 318								throw new StateChangingException(Account.State.TLS_ERROR);
 319							}
 320						} catch (KeyManagementException e) {
 321							features.encryptionEnabled = false;
 322							localSocket = new Socket();
 323						}
 324					} else {
 325						localSocket = new Socket();
 326						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 327					}
 328				} catch (IOException e) {
 329					throw new UnknownHostException();
 330				}
 331				try {
 332					startXmpp(localSocket);
 333				} catch (InterruptedException e) {
 334					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 335					return;
 336				} catch (Exception e) {
 337					throw new IOException(e.getMessage());
 338				}
 339			} else if (IP.matches(account.getServer().toString())) {
 340				localSocket = new Socket();
 341				try {
 342					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 343				} catch (IOException e) {
 344					throw new UnknownHostException();
 345				}
 346				try {
 347					startXmpp(localSocket);
 348				} catch (InterruptedException e) {
 349					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 350					return;
 351				} catch (Exception e) {
 352					throw new IOException(e.getMessage());
 353				}
 354			} else {
 355				List<Resolver.Result> results = Resolver.resolve(account.getJid().getDomainpart());
 356				for (Iterator<Resolver.Result> iterator = results.iterator(); iterator.hasNext(); ) {
 357					final Resolver.Result result = iterator.next();
 358					if (Thread.currentThread().isInterrupted()) {
 359						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 360						return;
 361					}
 362					try {
 363						// if tls is true, encryption is implied and must not be started
 364						features.encryptionEnabled = result.isDirectTls();
 365						verifiedHostname = result.isAuthenticated() ? result.getHostname().toString() : null;
 366						final InetSocketAddress addr;
 367						if (result.getIp() != null) {
 368							addr = new InetSocketAddress(result.getIp(), result.getPort());
 369							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 370									+ ": using values from dns " + result.getHostname().toString()
 371									+ "/" + result.getIp().getHostAddress() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
 372						} else {
 373							addr = new InetSocketAddress(IDN.toASCII(result.getHostname().toString()), result.getPort());
 374							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 375									+ ": using values from dns "
 376									+ result.getHostname().toString() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
 377						}
 378
 379						if (!features.encryptionEnabled) {
 380							localSocket = new Socket();
 381							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 382						} else {
 383							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 384							localSocket = tlsFactoryVerifier.factory.createSocket();
 385
 386							if (localSocket == null) {
 387								throw new IOException("could not initialize ssl socket");
 388							}
 389
 390							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 391							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 392							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 393
 394							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 395
 396							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), ((SSLSocket) localSocket).getSession())) {
 397								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 398								if (!iterator.hasNext()) {
 399									throw new StateChangingException(Account.State.TLS_ERROR);
 400								}
 401							}
 402						}
 403						if (startXmpp(localSocket)) {
 404							break; // successfully connected to server that speaks xmpp
 405						} else {
 406							localSocket.close();
 407						}
 408					} catch (final StateChangingException e) {
 409						throw e;
 410					} catch (InterruptedException e) {
 411						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 412						return;
 413					} catch (final Throwable e) {
 414						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 415						if (!iterator.hasNext()) {
 416							throw new UnknownHostException();
 417						}
 418					}
 419				}
 420			}
 421			processStream();
 422		}  catch (final SecurityException e) {
 423			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 424		} catch(final StateChangingException e) {
 425			this.changeStatus(e.state);
 426		} catch (final UnknownHostException | ConnectException e) {
 427			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 428		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 429			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 430		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 431			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 432			this.changeStatus(Account.State.OFFLINE);
 433			this.attempt = Math.max(0, this.attempt - 1);
 434		} finally {
 435			if (!Thread.currentThread().isInterrupted()) {
 436				forceCloseSocket();
 437				if (wakeLock.isHeld()) {
 438					try {
 439						wakeLock.release();
 440					} catch (final RuntimeException ignored) {
 441					}
 442				}
 443			} else {
 444				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock (is held="+wakeLock.isHeld()+") because thread was interrupted");
 445			}
 446		}
 447	}
 448
 449	/**
 450	 * Starts xmpp protocol, call after connecting to socket
 451	 * @return true if server returns with valid xmpp, false otherwise
 452     */
 453	private boolean startXmpp(Socket socket) throws Exception {
 454		if (Thread.currentThread().isInterrupted()) {
 455			throw new InterruptedException();
 456		}
 457		this.socket = socket;
 458		tagReader = new XmlReader(wakeLock);
 459		if (tagWriter != null) {
 460			tagWriter.forceClose();
 461		}
 462		tagWriter = new TagWriter();
 463		tagWriter.setOutputStream(socket.getOutputStream());
 464		tagReader.setInputStream(socket.getInputStream());
 465		tagWriter.beginDocument();
 466		sendStartStream();
 467		final Tag tag = tagReader.readTag();
 468		return tag != null && tag.isStart("stream");
 469	}
 470
 471	private static class TlsFactoryVerifier {
 472		private final SSLSocketFactory factory;
 473		private final DomainHostnameVerifier verifier;
 474
 475		public TlsFactoryVerifier(final SSLSocketFactory factory, final DomainHostnameVerifier verifier) throws IOException {
 476			this.factory = factory;
 477			this.verifier = verifier;
 478			if (factory == null || verifier == null) {
 479				throw new IOException("could not setup ssl");
 480			}
 481		}
 482	}
 483
 484	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 485		final SSLContext sc = SSLSocketHelper.getSSLContext();
 486		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 487		KeyManager[] keyManager;
 488		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 489			keyManager = new KeyManager[]{new MyKeyManager()};
 490		} else {
 491			keyManager = null;
 492		}
 493		String domain = account.getJid().getDomainpart();
 494		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 495		final SSLSocketFactory factory = sc.getSocketFactory();
 496		final DomainHostnameVerifier verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier(), mInteractive);
 497		return new TlsFactoryVerifier(factory, verifier);
 498	}
 499
 500	@Override
 501	public void run() {
 502		forceCloseSocket();
 503		connect();
 504	}
 505
 506	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 507		Tag nextTag = tagReader.readTag();
 508		while (nextTag != null && !nextTag.isEnd("stream")) {
 509			if (nextTag.isStart("error")) {
 510				processStreamError(nextTag);
 511			} else if (nextTag.isStart("features")) {
 512				processStreamFeatures(nextTag);
 513			} else if (nextTag.isStart("proceed")) {
 514				switchOverToTls(nextTag);
 515			} else if (nextTag.isStart("success")) {
 516				final String challenge = tagReader.readElement(nextTag).getContent();
 517				try {
 518					saslMechanism.getResponse(challenge);
 519				} catch (final SaslMechanism.AuthenticationException e) {
 520					Log.e(Config.LOGTAG, String.valueOf(e));
 521					throw new StateChangingException(Account.State.UNAUTHORIZED);
 522				}
 523				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 524				account.setKey(Account.PINNED_MECHANISM_KEY,
 525						String.valueOf(saslMechanism.getPriority()));
 526				tagReader.reset();
 527				sendStartStream();
 528				final Tag tag = tagReader.readTag();
 529				if (tag != null && tag.isStart("stream")) {
 530					processStream();
 531				} else {
 532					throw new IOException("server didn't restart stream after successful auth");
 533				}
 534				break;
 535			} else if (nextTag.isStart("failure")) {
 536				final Element failure = tagReader.readElement(nextTag);
 537				if (Namespace.SASL.equals(failure.getNamespace())) {
 538					final String text = failure.findChildContent("text");
 539					if (failure.hasChild("account-disabled")
 540							&& text != null
 541							&& text.contains("renew")
 542							&& Config.MAGIC_CREATE_DOMAIN != null
 543							&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 544						throw new StateChangingException(Account.State.PAYMENT_REQUIRED);
 545					} else {
 546						throw new StateChangingException(Account.State.UNAUTHORIZED);
 547					}
 548				} else if (Namespace.TLS.equals(failure.getNamespace())) {
 549					throw new StateChangingException(Account.State.TLS_ERROR);
 550				} else {
 551					throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 552				}
 553			} else if (nextTag.isStart("challenge")) {
 554				final String challenge = tagReader.readElement(nextTag).getContent();
 555				final Element response = new Element("response",Namespace.SASL);
 556				try {
 557					response.setContent(saslMechanism.getResponse(challenge));
 558				} catch (final SaslMechanism.AuthenticationException e) {
 559					// TODO: Send auth abort tag.
 560					Log.e(Config.LOGTAG, e.toString());
 561				}
 562				tagWriter.writeElement(response);
 563			} else if (nextTag.isStart("enabled")) {
 564				final Element enabled = tagReader.readElement(nextTag);
 565				if ("true".equals(enabled.getAttribute("resume"))) {
 566					this.streamId = enabled.getAttribute("id");
 567					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 568							+ ": stream management(" + smVersion
 569							+ ") enabled (resumable)");
 570				} else {
 571					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 572							+ ": stream management(" + smVersion + ") enabled");
 573				}
 574				this.stanzasReceived = 0;
 575				final RequestPacket r = new RequestPacket(smVersion);
 576				tagWriter.writeStanzaAsync(r);
 577			} else if (nextTag.isStart("resumed")) {
 578				this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 579				lastPacketReceived = SystemClock.elapsedRealtime();
 580				final Element resumed = tagReader.readElement(nextTag);
 581				final String h = resumed.getAttribute("h");
 582				try {
 583					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 584					synchronized (this.mStanzaQueue) {
 585						final int serverCount = Integer.parseInt(h);
 586						if (serverCount != stanzasSent) {
 587							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 588									+ ": session resumed with lost packages");
 589							stanzasSent = serverCount;
 590						} else {
 591							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 592						}
 593						acknowledgeStanzaUpTo(serverCount);
 594						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 595							failedStanzas.add(mStanzaQueue.valueAt(i));
 596						}
 597						mStanzaQueue.clear();
 598					}
 599					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 600					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 601						if (packet instanceof MessagePacket) {
 602							MessagePacket message = (MessagePacket) packet;
 603							mXmppConnectionService.markMessage(account,
 604									message.getTo().toBareJid(),
 605									message.getId(),
 606									Message.STATUS_UNSEND);
 607						}
 608						sendPacket(packet);
 609					}
 610				} catch (final NumberFormatException ignored) {
 611				}
 612				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 613				changeStatus(Account.State.ONLINE);
 614			} else if (nextTag.isStart("r")) {
 615				tagReader.readElement(nextTag);
 616				if (Config.EXTENDED_SM_LOGGING) {
 617					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 618				}
 619				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 620				tagWriter.writeStanzaAsync(ack);
 621			} else if (nextTag.isStart("a")) {
 622				boolean accountUiNeedsRefresh = false;
 623				synchronized (NotificationService.CATCHUP_LOCK) {
 624					if (mWaitingForSmCatchup.compareAndSet(true, false)) {
 625						int count = mSmCatchupMessageCounter.get();
 626						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": SM catchup complete (" + count + ")");
 627						accountUiNeedsRefresh = true;
 628						if (count > 0) {
 629							mXmppConnectionService.getNotificationService().finishBacklog(true, account);
 630						}
 631					}
 632				}
 633				if (accountUiNeedsRefresh) {
 634					mXmppConnectionService.updateAccountUi();
 635				}
 636				final Element ack = tagReader.readElement(nextTag);
 637				lastPacketReceived = SystemClock.elapsedRealtime();
 638				try {
 639					synchronized (this.mStanzaQueue) {
 640						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 641						acknowledgeStanzaUpTo(serverSequence);
 642					}
 643				} catch (NumberFormatException | NullPointerException e) {
 644					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 645				}
 646			} else if (nextTag.isStart("failed")) {
 647				Element failed = tagReader.readElement(nextTag);
 648				try {
 649					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 650					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 651					synchronized (this.mStanzaQueue) {
 652						acknowledgeStanzaUpTo(serverCount);
 653					}
 654				} catch (NumberFormatException | NullPointerException e) {
 655					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 656				}
 657				resetStreamId();
 658				sendBindRequest();
 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				try {
 776					callback.onIqPacketReceived(account, packet);
 777				} catch (StateChangingError error) {
 778					throw new StateChangingException(error.state);
 779				}
 780			}
 781		}
 782	}
 783
 784	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 785		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 786		this.messageListener.onMessagePacketReceived(account, packet);
 787	}
 788
 789	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 790		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 791		this.presenceListener.onPresencePacketReceived(account, packet);
 792	}
 793
 794	private void sendStartTLS() throws IOException {
 795		final Tag startTLS = Tag.empty("starttls");
 796		startTLS.setAttribute("xmlns", Namespace.TLS);
 797		tagWriter.writeTag(startTLS);
 798	}
 799
 800
 801
 802	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 803		tagReader.readTag();
 804		try {
 805			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 806			final InetAddress address = socket == null ? null : socket.getInetAddress();
 807
 808			if (address == null) {
 809				throw new IOException("could not setup ssl");
 810			}
 811
 812			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 813
 814			if (sslSocket == null) {
 815				throw new IOException("could not initialize ssl socket");
 816			}
 817
 818			SSLSocketHelper.setSecurity(sslSocket);
 819
 820			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), this.verifiedHostname, sslSocket.getSession())) {
 821				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 822				throw new StateChangingException(Account.State.TLS_ERROR);
 823			}
 824			tagReader.setInputStream(sslSocket.getInputStream());
 825			tagWriter.setOutputStream(sslSocket.getOutputStream());
 826			sendStartStream();
 827			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 828			features.encryptionEnabled = true;
 829			final Tag tag = tagReader.readTag();
 830			if (tag != null && tag.isStart("stream")) {
 831				processStream();
 832			} else {
 833				throw new IOException("server didn't restart stream after STARTTLS");
 834			}
 835			sslSocket.close();
 836		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 837			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 838			throw new StateChangingException(Account.State.TLS_ERROR);
 839		}
 840	}
 841
 842	private void processStreamFeatures(final Tag currentTag)
 843		throws XmlPullParserException, IOException {
 844		this.streamFeatures = tagReader.readElement(currentTag);
 845		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 846			sendStartTLS();
 847		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 848			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 849				sendRegistryRequest();
 850			} else {
 851				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 852			}
 853		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 854			throw new StateChangingException(Account.State.REGISTRATION_NOT_SUPPORTED);
 855		} else if (this.streamFeatures.hasChild("mechanisms")
 856				&& shouldAuthenticate
 857				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 858			authenticate();
 859		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 860			if (Config.EXTENDED_SM_LOGGING) {
 861				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 862			}
 863			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 864			this.mSmCatchupMessageCounter.set(0);
 865			this.mWaitingForSmCatchup.set(true);
 866			this.tagWriter.writeStanzaAsync(resume);
 867		} else if (needsBinding) {
 868			if (this.streamFeatures.hasChild("bind")) {
 869				sendBindRequest();
 870			} else {
 871				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 872			}
 873		}
 874	}
 875
 876	private void authenticate() throws IOException {
 877		final List<String> mechanisms = extractMechanisms(streamFeatures
 878				.findChild("mechanisms"));
 879		final Element auth = new Element("auth",Namespace.SASL);
 880		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 881			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 882		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 883			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 884		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 885			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 886		} else if (mechanisms.contains("PLAIN")) {
 887			saslMechanism = new Plain(tagWriter, account);
 888		} else if (mechanisms.contains("DIGEST-MD5")) {
 889			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 890		} else if (mechanisms.contains("ANONYMOUS")) {
 891			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 892		}
 893		if (saslMechanism != null) {
 894			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 895			if (pinnedMechanism > saslMechanism.getPriority()) {
 896				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 897						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 898						") than pinned priority (" + pinnedMechanism +
 899						"). Possible downgrade attack?");
 900				throw new StateChangingException(Account.State.DOWNGRADE_ATTACK);
 901			}
 902			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 903			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 904			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 905				auth.setContent(saslMechanism.getClientFirstMessage());
 906			}
 907			tagWriter.writeElement(auth);
 908		} else {
 909			throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 910		}
 911	}
 912
 913	private List<String> extractMechanisms(final Element stream) {
 914		final ArrayList<String> mechanisms = new ArrayList<>(stream
 915				.getChildren().size());
 916		for (final Element child : stream.getChildren()) {
 917			mechanisms.add(child.getContent());
 918		}
 919		return mechanisms;
 920	}
 921
 922	private void sendRegistryRequest() {
 923		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 924		register.query("jabber:iq:register");
 925		register.setTo(account.getServer());
 926		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 927
 928			@Override
 929			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 930				boolean failed = false;
 931				if (packet.getType() == IqPacket.TYPE.RESULT
 932						&& packet.query().hasChild("username")
 933						&& (packet.query().hasChild("password"))) {
 934					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 935					final Element username = new Element("username").setContent(account.getUsername());
 936					final Element password = new Element("password").setContent(account.getPassword());
 937					register.query("jabber:iq:register").addChild(username);
 938					register.query().addChild(password);
 939					register.setFrom(account.getJid().toBareJid());
 940					sendUnmodifiedIqPacket(register, registrationResponseListener);
 941				} else if (packet.getType() == IqPacket.TYPE.RESULT
 942						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 943					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 944					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 945					final String id = packet.getId();
 946
 947					Bitmap captcha = null;
 948					if (blob != null) {
 949						try {
 950							final String base64Blob = blob.getContent();
 951							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 952							InputStream stream = new ByteArrayInputStream(strBlob);
 953							captcha = BitmapFactory.decodeStream(stream);
 954						} catch (Exception e) {
 955							//ignored
 956						}
 957					} else {
 958						try {
 959							Field url = data.getFieldByName("url");
 960							String urlString = url.findChildContent("value");
 961							URL uri = new URL(urlString);
 962							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 963						} catch (IOException e) {
 964							Log.e(Config.LOGTAG, e.toString());
 965						}
 966					}
 967
 968					if (captcha != null) {
 969						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 970					}
 971				} else {
 972					failed = true;
 973				}
 974
 975				if (failed) {
 976					final Element query = packet.query();
 977					final String instructions = query.findChildContent("instructions");
 978					final Element oob = query.findChild("x",Namespace.OOB);
 979					final String url = oob == null ? null : oob.findChildContent("url");
 980					if (url == null && instructions != null) {
 981						Matcher matcher = Patterns.AUTOLINK_WEB_URL.matcher(instructions);
 982						if (matcher.find()) {
 983							setAccountCreationFailed(instructions.substring(matcher.start(),matcher.end()));
 984						} else {
 985							setAccountCreationFailed(null);
 986						}
 987					} else {
 988						setAccountCreationFailed(url);
 989					}
 990				}
 991			}
 992		});
 993	}
 994
 995	private void setAccountCreationFailed(String url) {
 996		if (url != null && (url.toLowerCase().startsWith("http://") || url.toLowerCase().startsWith("https://"))) {
 997			changeStatus(Account.State.REGISTRATION_WEB);
 998			this.webRegistrationUrl = url;
 999		} else {
1000			changeStatus(Account.State.REGISTRATION_FAILED);
1001		}
1002		disconnect(true);
1003		Log.d(Config.LOGTAG, account.getJid().toBareJid()+": could not register. url="+url);
1004	}
1005
1006	public String getWebRegistrationUrl() {
1007		return this.webRegistrationUrl;
1008	}
1009
1010	public void resetEverything() {
1011		resetAttemptCount(true);
1012		resetStreamId();
1013		clearIqCallbacks();
1014		mStanzaQueue.clear();
1015		this.webRegistrationUrl = null;
1016		synchronized (this.disco) {
1017			disco.clear();
1018		}
1019	}
1020
1021	private void sendBindRequest() {
1022		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
1023			try {
1024				Thread.sleep(500);
1025			} catch (final InterruptedException ignored) {
1026			}
1027		}
1028		needsBinding = false;
1029		clearIqCallbacks();
1030		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1031		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1032				.addChild("resource").setContent(account.getResource());
1033		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1034			@Override
1035			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1036				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1037					return;
1038				}
1039				final Element bind = packet.findChild("bind");
1040				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1041					final Element jid = bind.findChild("jid");
1042					if (jid != null && jid.getContent() != null) {
1043						try {
1044							if (account.setJid(Jid.fromString(jid.getContent()))) {
1045								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1046								mXmppConnectionService.databaseBackend.updateAccount(account);
1047							}
1048							if (streamFeatures.hasChild("session")
1049									&& !streamFeatures.findChild("session").hasChild("optional")) {
1050								sendStartSession();
1051							} else {
1052								sendPostBindInitialization();
1053							}
1054							return;
1055						} catch (final InvalidJidException e) {
1056							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1057						}
1058					} else {
1059						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1060					}
1061				} else {
1062					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1063				}
1064				final Element error = packet.findChild("error");
1065				final String resource = account.getResource().split("\\.")[0];
1066				if (packet.getType() == IqPacket.TYPE.ERROR && error != null && error.hasChild("conflict")) {
1067					account.setResource(resource + "." + nextRandomId());
1068				} else {
1069					account.setResource(resource);
1070				}
1071				throw new StateChangingError(Account.State.BIND_FAILURE);
1072			}
1073		});
1074	}
1075
1076	private void clearIqCallbacks() {
1077		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1078		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1079		synchronized (this.packetCallbacks) {
1080			if (this.packetCallbacks.size() == 0) {
1081				return;
1082			}
1083			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1084			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1085			while (iterator.hasNext()) {
1086				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1087				callbacks.add(entry.second);
1088				iterator.remove();
1089			}
1090		}
1091		for(OnIqPacketReceived callback : callbacks) {
1092			try {
1093				callback.onIqPacketReceived(account, failurePacket);
1094			} catch (StateChangingError error) {
1095				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": caught StateChangingError("+error.state.toString()+") while clearing callbacks");
1096				//ignore
1097			}
1098		}
1099		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1100	}
1101
1102	public void sendDiscoTimeout() {
1103		if (mWaitForDisco.compareAndSet(true, false)) {
1104			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": finalizing bind after disco timeout");
1105			finalizeBind();
1106		}
1107	}
1108
1109	private void sendStartSession() {
1110		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1111		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1112		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1113		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1114			@Override
1115			public void onIqPacketReceived(Account account, IqPacket packet) {
1116				if (packet.getType() == IqPacket.TYPE.RESULT) {
1117					sendPostBindInitialization();
1118				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1119					throw new StateChangingError(Account.State.SESSION_FAILURE);
1120				}
1121			}
1122		});
1123	}
1124
1125	private void sendPostBindInitialization() {
1126		smVersion = 0;
1127		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1128			smVersion = 3;
1129		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1130			smVersion = 2;
1131		}
1132		if (smVersion != 0) {
1133			synchronized (this.mStanzaQueue) {
1134				final EnablePacket enable = new EnablePacket(smVersion);
1135				tagWriter.writeStanzaAsync(enable);
1136				stanzasSent = 0;
1137				mStanzaQueue.clear();
1138			}
1139		}
1140		features.carbonsEnabled = false;
1141		features.blockListRequested = false;
1142		synchronized (this.disco) {
1143			this.disco.clear();
1144		}
1145		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1146		mPendingServiceDiscoveries.set(0);
1147		if (smVersion == 0 || Patches.DISCO_EXCEPTIONS.contains(account.getJid().getDomainpart())) {
1148			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": do not wait for service discovery");
1149			mWaitForDisco.set(false);
1150		} else {
1151			mWaitForDisco.set(true);
1152		}
1153		lastDiscoStarted = SystemClock.elapsedRealtime();
1154		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1155		Element caps = streamFeatures.findChild("c");
1156		final String hash = caps == null ? null : caps.getAttribute("hash");
1157		final String ver = caps == null ? null : caps.getAttribute("ver");
1158		ServiceDiscoveryResult discoveryResult = null;
1159		if (hash != null && ver != null) {
1160			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1161		}
1162		if (discoveryResult == null) {
1163			sendServiceDiscoveryInfo(account.getServer());
1164		} else {
1165			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1166			disco.put(account.getServer(), discoveryResult);
1167		}
1168		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1169		sendServiceDiscoveryItems(account.getServer());
1170
1171		if (!mWaitForDisco.get()) {
1172			finalizeBind();
1173		}
1174		this.lastSessionStarted = SystemClock.elapsedRealtime();
1175	}
1176
1177	private void sendServiceDiscoveryInfo(final Jid jid) {
1178		mPendingServiceDiscoveries.incrementAndGet();
1179		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1180		iq.setTo(jid);
1181		iq.query("http://jabber.org/protocol/disco#info");
1182		this.sendIqPacket(iq, new OnIqPacketReceived() {
1183
1184			@Override
1185			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1186				if (packet.getType() == IqPacket.TYPE.RESULT) {
1187					boolean advancedStreamFeaturesLoaded;
1188					synchronized (XmppConnection.this.disco) {
1189						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1190						if (jid.equals(account.getServer())) {
1191							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1192						}
1193						disco.put(jid, result);
1194						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1195								&& disco.containsKey(account.getJid().toBareJid());
1196					}
1197					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1198						enableAdvancedStreamFeatures();
1199					}
1200				} else {
1201					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1202				}
1203				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1204					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1205							&& mWaitForDisco.compareAndSet(true, false)) {
1206						finalizeBind();
1207					}
1208				}
1209			}
1210		});
1211	}
1212
1213	private void finalizeBind() {
1214		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1215		if (bindListener != null) {
1216			bindListener.onBind(account);
1217		}
1218		changeStatus(Account.State.ONLINE);
1219	}
1220
1221	private void enableAdvancedStreamFeatures() {
1222		if (getFeatures().carbons() && !features.carbonsEnabled) {
1223			sendEnableCarbons();
1224		}
1225		if (getFeatures().blocking() && !features.blockListRequested) {
1226			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1227			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1228		}
1229		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1230			listener.onAdvancedStreamFeaturesAvailable(account);
1231		}
1232	}
1233
1234	private void sendServiceDiscoveryItems(final Jid server) {
1235		mPendingServiceDiscoveries.incrementAndGet();
1236		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1237		iq.setTo(server.toDomainJid());
1238		iq.query("http://jabber.org/protocol/disco#items");
1239		this.sendIqPacket(iq, new OnIqPacketReceived() {
1240
1241			@Override
1242			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1243				if (packet.getType() == IqPacket.TYPE.RESULT) {
1244					HashSet<Jid> items = new HashSet<Jid>();
1245					final List<Element> elements = packet.query().getChildren();
1246					for (final Element element : elements) {
1247						if (element.getName().equals("item")) {
1248							final Jid jid = element.getAttributeAsJid("jid");
1249							if (jid != null && !jid.equals(account.getServer())) {
1250								items.add(jid);
1251							}
1252						}
1253					}
1254					for(Jid jid : items) {
1255						sendServiceDiscoveryInfo(jid);
1256					}
1257				} else {
1258					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1259				}
1260				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1261					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1262							&& mWaitForDisco.compareAndSet(true, false)) {
1263						finalizeBind();
1264					}
1265				}
1266			}
1267		});
1268	}
1269
1270	private void sendEnableCarbons() {
1271		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1272		iq.addChild("enable", "urn:xmpp:carbons:2");
1273		this.sendIqPacket(iq, new OnIqPacketReceived() {
1274
1275			@Override
1276			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1277				if (!packet.hasChild("error")) {
1278					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1279							+ ": successfully enabled carbons");
1280					features.carbonsEnabled = true;
1281				} else {
1282					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1283							+ ": error enableing carbons " + packet.toString());
1284				}
1285			}
1286		});
1287	}
1288
1289	private void processStreamError(final Tag currentTag)
1290		throws XmlPullParserException, IOException {
1291		final Element streamError = tagReader.readElement(currentTag);
1292		if (streamError == null) {
1293			return;
1294		}
1295		if (streamError.hasChild("conflict")) {
1296			final String resource = account.getResource().split("\\.")[0];
1297			account.setResource(resource + "." + nextRandomId());
1298			Log.d(Config.LOGTAG,
1299					account.getJid().toBareJid() + ": switching resource due to conflict ("
1300					+ account.getResource() + ")");
1301			throw new IOException();
1302		} else if (streamError.hasChild("host-unknown")) {
1303			throw new StateChangingException(Account.State.HOST_UNKNOWN);
1304		} else if (streamError.hasChild("policy-violation")) {
1305			throw new StateChangingException(Account.State.POLICY_VIOLATION);
1306		} else {
1307			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1308			throw new StateChangingException(Account.State.STREAM_ERROR);
1309		}
1310	}
1311
1312	private void sendStartStream() throws IOException {
1313		final Tag stream = Tag.start("stream:stream");
1314		stream.setAttribute("to", account.getServer().toString());
1315		stream.setAttribute("version", "1.0");
1316		stream.setAttribute("xml:lang", "en");
1317		stream.setAttribute("xmlns", "jabber:client");
1318		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1319		tagWriter.writeTag(stream);
1320	}
1321
1322	private String nextRandomId() {
1323		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(36);
1324	}
1325
1326	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1327		packet.setFrom(account.getJid());
1328		return this.sendUnmodifiedIqPacket(packet, callback);
1329	}
1330
1331	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1332		if (packet.getId() == null) {
1333			packet.setAttribute("id", nextRandomId());
1334		}
1335		if (callback != null) {
1336			synchronized (this.packetCallbacks) {
1337				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1338			}
1339		}
1340		this.sendPacket(packet);
1341		return packet.getId();
1342	}
1343
1344	public void sendMessagePacket(final MessagePacket packet) {
1345		this.sendPacket(packet);
1346	}
1347
1348	public void sendPresencePacket(final PresencePacket packet) {
1349		this.sendPacket(packet);
1350	}
1351
1352	private synchronized void sendPacket(final AbstractStanza packet) {
1353		if (stanzasSent == Integer.MAX_VALUE) {
1354			resetStreamId();
1355			disconnect(true);
1356			return;
1357		}
1358		synchronized (this.mStanzaQueue) {
1359			tagWriter.writeStanzaAsync(packet);
1360			if (packet instanceof AbstractAcknowledgeableStanza) {
1361				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1362				++stanzasSent;
1363				this.mStanzaQueue.append(stanzasSent, stanza);
1364				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1365					if (Config.EXTENDED_SM_LOGGING) {
1366						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1367					}
1368					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1369				}
1370			}
1371		}
1372	}
1373
1374	public void sendPing() {
1375		if (!r()) {
1376			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1377			iq.setFrom(account.getJid());
1378			iq.addChild("ping", "urn:xmpp:ping");
1379			this.sendIqPacket(iq, null);
1380		}
1381		this.lastPingSent = SystemClock.elapsedRealtime();
1382	}
1383
1384	public void setOnMessagePacketReceivedListener(
1385			final OnMessagePacketReceived listener) {
1386		this.messageListener = listener;
1387			}
1388
1389	public void setOnUnregisteredIqPacketReceivedListener(
1390			final OnIqPacketReceived listener) {
1391		this.unregisteredIqListener = listener;
1392			}
1393
1394	public void setOnPresencePacketReceivedListener(
1395			final OnPresencePacketReceived listener) {
1396		this.presenceListener = listener;
1397			}
1398
1399	public void setOnJinglePacketReceivedListener(
1400			final OnJinglePacketReceived listener) {
1401		this.jingleListener = listener;
1402			}
1403
1404	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1405		this.statusListener = listener;
1406	}
1407
1408	public void setOnBindListener(final OnBindListener listener) {
1409		this.bindListener = listener;
1410	}
1411
1412	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1413		this.acknowledgedListener = listener;
1414	}
1415
1416	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1417		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1418			this.advancedStreamFeaturesLoadedListeners.add(listener);
1419		}
1420	}
1421
1422	private void forceCloseSocket() {
1423		if (socket != null) {
1424			try {
1425				socket.close();
1426			} catch (IOException e) {
1427				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1428			}
1429		} else {
1430			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1431		}
1432	}
1433
1434	public void interrupt() {
1435		Thread.currentThread().interrupt();
1436	}
1437
1438	public void disconnect(final boolean force) {
1439		interrupt();
1440		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1441		if (force) {
1442			forceCloseSocket();
1443		} else {
1444			if (tagWriter.isActive()) {
1445				tagWriter.finish();
1446				try {
1447					int i = 0;
1448					boolean warned = false;
1449					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1450						if (!warned) {
1451							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1452							warned = true;
1453						}
1454						try {
1455							Thread.sleep(200);
1456						} catch(InterruptedException e) {
1457							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1458						}
1459						i++;
1460					}
1461					if (warned) {
1462						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1463					}
1464					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1465					tagWriter.writeTag(Tag.end("stream:stream"));
1466				} catch (final IOException e) {
1467					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1468				} finally {
1469					forceCloseSocket();
1470				}
1471			}
1472		}
1473	}
1474
1475	public void resetStreamId() {
1476		this.streamId = null;
1477	}
1478
1479	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1480		synchronized (this.disco) {
1481			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1482			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1483				if (cursor.getValue().getFeatures().contains(feature)) {
1484					items.add(cursor);
1485				}
1486			}
1487			return items;
1488		}
1489	}
1490
1491	public Jid findDiscoItemByFeature(final String feature) {
1492		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1493		if (items.size() >= 1) {
1494			return items.get(0).getKey();
1495		}
1496		return null;
1497	}
1498
1499	public boolean r() {
1500		if (getFeatures().sm()) {
1501			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1502			return true;
1503		} else {
1504			return false;
1505		}
1506	}
1507
1508	public String getMucServer() {
1509		synchronized (this.disco) {
1510			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1511				final ServiceDiscoveryResult value = cursor.getValue();
1512				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1513						&& !value.getFeatures().contains("jabber:iq:gateway")
1514						&& !value.hasIdentity("conference", "irc")) {
1515					return cursor.getKey().toString();
1516				}
1517			}
1518		}
1519		return null;
1520	}
1521
1522	public int getTimeToNextAttempt() {
1523		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1524		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1525		return interval - secondsSinceLast;
1526	}
1527
1528	public int getAttempt() {
1529		return this.attempt;
1530	}
1531
1532	public Features getFeatures() {
1533		return this.features;
1534	}
1535
1536	public long getLastSessionEstablished() {
1537		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1538		return System.currentTimeMillis() - diff;
1539	}
1540
1541	public long getLastConnect() {
1542		return this.lastConnect;
1543	}
1544
1545	public long getLastPingSent() {
1546		return this.lastPingSent;
1547	}
1548
1549	public long getLastDiscoStarted() {
1550		return this.lastDiscoStarted;
1551	}
1552	public long getLastPacketReceived() {
1553		return this.lastPacketReceived;
1554	}
1555
1556	public void sendActive() {
1557		this.sendPacket(new ActivePacket());
1558	}
1559
1560	public void sendInactive() {
1561		this.sendPacket(new InactivePacket());
1562	}
1563
1564	public void resetAttemptCount(boolean resetConnectTime) {
1565		this.attempt = 0;
1566		if (resetConnectTime) {
1567			this.lastConnect = 0;
1568		}
1569	}
1570
1571	public void setInteractive(boolean interactive) {
1572		this.mInteractive = interactive;
1573	}
1574
1575	public Identity getServerIdentity() {
1576		synchronized (this.disco) {
1577			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1578			if (result == null) {
1579				return Identity.UNKNOWN;
1580			}
1581			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1582				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1583					switch (id.getName()) {
1584						case "Prosody":
1585							return Identity.PROSODY;
1586						case "ejabberd":
1587							return Identity.EJABBERD;
1588						case "Slack-XMPP":
1589							return Identity.SLACK;
1590					}
1591				}
1592			}
1593		}
1594		return Identity.UNKNOWN;
1595	}
1596
1597	private class StateChangingError extends Error {
1598		private final Account.State state;
1599
1600		public StateChangingError(Account.State state) {
1601			this.state = state;
1602		}
1603	}
1604
1605	private class StateChangingException extends IOException {
1606		private final Account.State state;
1607
1608		public StateChangingException(Account.State state) {
1609			this.state = state;
1610		}
1611	}
1612
1613	public enum Identity {
1614		FACEBOOK,
1615		SLACK,
1616		EJABBERD,
1617		PROSODY,
1618		NIMBUZZ,
1619		UNKNOWN
1620	}
1621
1622	public class Features {
1623		XmppConnection connection;
1624		private boolean carbonsEnabled = false;
1625		private boolean encryptionEnabled = false;
1626		private boolean blockListRequested = false;
1627
1628		public Features(final XmppConnection connection) {
1629			this.connection = connection;
1630		}
1631
1632		private boolean hasDiscoFeature(final Jid server, final String feature) {
1633			synchronized (XmppConnection.this.disco) {
1634				return connection.disco.containsKey(server) &&
1635						connection.disco.get(server).getFeatures().contains(feature);
1636			}
1637		}
1638
1639		public boolean carbons() {
1640			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1641		}
1642
1643		public boolean blocking() {
1644			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1645		}
1646
1647		public boolean spamReporting() {
1648			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1649		}
1650
1651		public boolean register() {
1652			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1653		}
1654
1655		public boolean sm() {
1656			return streamId != null
1657					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1658		}
1659
1660		public boolean csi() {
1661			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1662		}
1663
1664		public boolean pep() {
1665			synchronized (XmppConnection.this.disco) {
1666				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1667				return info != null && info.hasIdentity("pubsub", "pep");
1668			}
1669		}
1670
1671		public boolean pepPersistent() {
1672			synchronized (XmppConnection.this.disco) {
1673				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1674				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1675			}
1676		}
1677
1678		public boolean mam() {
1679			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1680					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1681		}
1682
1683		public boolean mamLegacy() {
1684			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1685					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1686		}
1687
1688		public boolean push() {
1689			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1690					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1691		}
1692
1693		public boolean rosterVersioning() {
1694			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1695		}
1696
1697		public void setBlockListRequested(boolean value) {
1698			this.blockListRequested = value;
1699		}
1700
1701		public boolean httpUpload(long filesize) {
1702			if (Config.DISABLE_HTTP_UPLOAD) {
1703				return false;
1704			} else {
1705				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1706				if (items.size() > 0) {
1707					try {
1708						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1709						if(filesize <= maxsize) {
1710							return true;
1711						} else {
1712							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1713							return false;
1714						}
1715					} catch (Exception e) {
1716						return true;
1717					}
1718				} else {
1719					return false;
1720				}
1721			}
1722		}
1723
1724		public long getMaxHttpUploadSize() {
1725			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1726				if (items.size() > 0) {
1727					try {
1728						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1729					} catch (Exception e) {
1730						return -1;
1731					}
1732				} else {
1733					return -1;
1734				}
1735		}
1736
1737		public boolean stanzaIds() {
1738			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1739		}
1740	}
1741
1742	private IqGenerator getIqGenerator() {
1743		return mXmppConnectionService.getIqGenerator();
1744	}
1745}