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								throw new StateChangingException(Account.State.TLS_ERROR);
 399							}
 400						}
 401						if (startXmpp(localSocket)) {
 402							break; // successfully connected to server that speaks xmpp
 403						} else {
 404							localSocket.close();
 405						}
 406					} catch (final StateChangingException e) {
 407						throw e;
 408					} catch (InterruptedException e) {
 409						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 410						return;
 411					} catch (final Throwable e) {
 412						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 413						if (!iterator.hasNext()) {
 414							throw new UnknownHostException();
 415						}
 416					}
 417				}
 418			}
 419			processStream();
 420		}  catch (final SecurityException e) {
 421			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 422		} catch(final StateChangingException e) {
 423			this.changeStatus(e.state);
 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 IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 429			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 430			this.changeStatus(Account.State.OFFLINE);
 431			this.attempt = Math.max(0, this.attempt - 1);
 432		} finally {
 433			if (!Thread.currentThread().isInterrupted()) {
 434				forceCloseSocket();
 435				if (wakeLock.isHeld()) {
 436					try {
 437						wakeLock.release();
 438					} catch (final RuntimeException ignored) {
 439					}
 440				}
 441			} else {
 442				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock (is held="+wakeLock.isHeld()+") because thread was interrupted");
 443			}
 444		}
 445	}
 446
 447	/**
 448	 * Starts xmpp protocol, call after connecting to socket
 449	 * @return true if server returns with valid xmpp, false otherwise
 450     */
 451	private boolean startXmpp(Socket socket) throws Exception {
 452		if (Thread.currentThread().isInterrupted()) {
 453			throw new InterruptedException();
 454		}
 455		this.socket = socket;
 456		tagReader = new XmlReader(wakeLock);
 457		if (tagWriter != null) {
 458			tagWriter.forceClose();
 459		}
 460		tagWriter = new TagWriter();
 461		tagWriter.setOutputStream(socket.getOutputStream());
 462		tagReader.setInputStream(socket.getInputStream());
 463		tagWriter.beginDocument();
 464		sendStartStream();
 465		final Tag tag = tagReader.readTag();
 466		return tag != null && tag.isStart("stream");
 467	}
 468
 469	private static class TlsFactoryVerifier {
 470		private final SSLSocketFactory factory;
 471		private final DomainHostnameVerifier verifier;
 472
 473		public TlsFactoryVerifier(final SSLSocketFactory factory, final DomainHostnameVerifier verifier) throws IOException {
 474			this.factory = factory;
 475			this.verifier = verifier;
 476			if (factory == null || verifier == null) {
 477				throw new IOException("could not setup ssl");
 478			}
 479		}
 480	}
 481
 482	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 483		final SSLContext sc = SSLSocketHelper.getSSLContext();
 484		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 485		KeyManager[] keyManager;
 486		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 487			keyManager = new KeyManager[]{new MyKeyManager()};
 488		} else {
 489			keyManager = null;
 490		}
 491		String domain = account.getJid().getDomainpart();
 492		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 493		final SSLSocketFactory factory = sc.getSocketFactory();
 494		final DomainHostnameVerifier verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier(), mInteractive);
 495		return new TlsFactoryVerifier(factory, verifier);
 496	}
 497
 498	@Override
 499	public void run() {
 500		forceCloseSocket();
 501		connect();
 502	}
 503
 504	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 505		Tag nextTag = tagReader.readTag();
 506		while (nextTag != null && !nextTag.isEnd("stream")) {
 507			if (nextTag.isStart("error")) {
 508				processStreamError(nextTag);
 509			} else if (nextTag.isStart("features")) {
 510				processStreamFeatures(nextTag);
 511			} else if (nextTag.isStart("proceed")) {
 512				switchOverToTls(nextTag);
 513			} else if (nextTag.isStart("success")) {
 514				final String challenge = tagReader.readElement(nextTag).getContent();
 515				try {
 516					saslMechanism.getResponse(challenge);
 517				} catch (final SaslMechanism.AuthenticationException e) {
 518					Log.e(Config.LOGTAG, String.valueOf(e));
 519					throw new StateChangingException(Account.State.UNAUTHORIZED);
 520				}
 521				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 522				account.setKey(Account.PINNED_MECHANISM_KEY,
 523						String.valueOf(saslMechanism.getPriority()));
 524				tagReader.reset();
 525				sendStartStream();
 526				final Tag tag = tagReader.readTag();
 527				if (tag != null && tag.isStart("stream")) {
 528					processStream();
 529				} else {
 530					throw new IOException("server didn't restart stream after successful auth");
 531				}
 532				break;
 533			} else if (nextTag.isStart("failure")) {
 534				final Element failure = tagReader.readElement(nextTag);
 535				if (Namespace.SASL.equals(failure.getNamespace())) {
 536					final String text = failure.findChildContent("text");
 537					if (failure.hasChild("account-disabled")
 538							&& text != null
 539							&& text.contains("renew")
 540							&& Config.MAGIC_CREATE_DOMAIN != null
 541							&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 542						throw new StateChangingException(Account.State.PAYMENT_REQUIRED);
 543					} else {
 544						throw new StateChangingException(Account.State.UNAUTHORIZED);
 545					}
 546				} else if (Namespace.TLS.equals(failure.getNamespace())) {
 547					throw new StateChangingException(Account.State.TLS_ERROR);
 548				} else {
 549					throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 550				}
 551			} else if (nextTag.isStart("challenge")) {
 552				final String challenge = tagReader.readElement(nextTag).getContent();
 553				final Element response = new Element("response",Namespace.SASL);
 554				try {
 555					response.setContent(saslMechanism.getResponse(challenge));
 556				} catch (final SaslMechanism.AuthenticationException e) {
 557					// TODO: Send auth abort tag.
 558					Log.e(Config.LOGTAG, e.toString());
 559				}
 560				tagWriter.writeElement(response);
 561			} else if (nextTag.isStart("enabled")) {
 562				final Element enabled = tagReader.readElement(nextTag);
 563				if ("true".equals(enabled.getAttribute("resume"))) {
 564					this.streamId = enabled.getAttribute("id");
 565					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 566							+ ": stream management(" + smVersion
 567							+ ") enabled (resumable)");
 568				} else {
 569					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 570							+ ": stream management(" + smVersion + ") enabled");
 571				}
 572				this.stanzasReceived = 0;
 573				final RequestPacket r = new RequestPacket(smVersion);
 574				tagWriter.writeStanzaAsync(r);
 575			} else if (nextTag.isStart("resumed")) {
 576				this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 577				lastPacketReceived = SystemClock.elapsedRealtime();
 578				final Element resumed = tagReader.readElement(nextTag);
 579				final String h = resumed.getAttribute("h");
 580				try {
 581					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 582					synchronized (this.mStanzaQueue) {
 583						final int serverCount = Integer.parseInt(h);
 584						if (serverCount != stanzasSent) {
 585							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 586									+ ": session resumed with lost packages");
 587							stanzasSent = serverCount;
 588						} else {
 589							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 590						}
 591						acknowledgeStanzaUpTo(serverCount);
 592						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 593							failedStanzas.add(mStanzaQueue.valueAt(i));
 594						}
 595						mStanzaQueue.clear();
 596					}
 597					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 598					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 599						if (packet instanceof MessagePacket) {
 600							MessagePacket message = (MessagePacket) packet;
 601							mXmppConnectionService.markMessage(account,
 602									message.getTo().toBareJid(),
 603									message.getId(),
 604									Message.STATUS_UNSEND);
 605						}
 606						sendPacket(packet);
 607					}
 608				} catch (final NumberFormatException ignored) {
 609				}
 610				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 611				changeStatus(Account.State.ONLINE);
 612			} else if (nextTag.isStart("r")) {
 613				tagReader.readElement(nextTag);
 614				if (Config.EXTENDED_SM_LOGGING) {
 615					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 616				}
 617				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 618				tagWriter.writeStanzaAsync(ack);
 619			} else if (nextTag.isStart("a")) {
 620				boolean accountUiNeedsRefresh = false;
 621				synchronized (NotificationService.CATCHUP_LOCK) {
 622					if (mWaitingForSmCatchup.compareAndSet(true, false)) {
 623						int count = mSmCatchupMessageCounter.get();
 624						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": SM catchup complete (" + count + ")");
 625						accountUiNeedsRefresh = true;
 626						if (count > 0) {
 627							mXmppConnectionService.getNotificationService().finishBacklog(true, account);
 628						}
 629					}
 630				}
 631				if (accountUiNeedsRefresh) {
 632					mXmppConnectionService.updateAccountUi();
 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				sendBindRequest();
 657			} else if (nextTag.isStart("iq")) {
 658				processIq(nextTag);
 659			} else if (nextTag.isStart("message")) {
 660				processMessage(nextTag);
 661			} else if (nextTag.isStart("presence")) {
 662				processPresence(nextTag);
 663			}
 664			nextTag = tagReader.readTag();
 665		}
 666	}
 667
 668	private void acknowledgeStanzaUpTo(int serverCount) {
 669		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 670			if (serverCount >= mStanzaQueue.keyAt(i)) {
 671				if (Config.EXTENDED_SM_LOGGING) {
 672					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 673				}
 674				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 675				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 676					MessagePacket packet = (MessagePacket) stanza;
 677					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 678				}
 679				mStanzaQueue.removeAt(i);
 680				i--;
 681			}
 682		}
 683	}
 684
 685	private Element processPacket(final Tag currentTag, final int packetType)
 686		throws XmlPullParserException, IOException {
 687		Element element;
 688		switch (packetType) {
 689			case PACKET_IQ:
 690				element = new IqPacket();
 691				break;
 692			case PACKET_MESSAGE:
 693				element = new MessagePacket();
 694				break;
 695			case PACKET_PRESENCE:
 696				element = new PresencePacket();
 697				break;
 698			default:
 699				return null;
 700		}
 701		element.setAttributes(currentTag.getAttributes());
 702		Tag nextTag = tagReader.readTag();
 703		if (nextTag == null) {
 704			throw new IOException("interrupted mid tag");
 705		}
 706		while (!nextTag.isEnd(element.getName())) {
 707			if (!nextTag.isNo()) {
 708				final Element child = tagReader.readElement(nextTag);
 709				final String type = currentTag.getAttribute("type");
 710				if (packetType == PACKET_IQ
 711						&& "jingle".equals(child.getName())
 712						&& ("set".equalsIgnoreCase(type) || "get"
 713							.equalsIgnoreCase(type))) {
 714					element = new JinglePacket();
 715					element.setAttributes(currentTag.getAttributes());
 716							}
 717				element.addChild(child);
 718			}
 719			nextTag = tagReader.readTag();
 720			if (nextTag == null) {
 721				throw new IOException("interrupted mid tag");
 722			}
 723		}
 724		if (stanzasReceived == Integer.MAX_VALUE) {
 725			resetStreamId();
 726			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 727		}
 728		++stanzasReceived;
 729		lastPacketReceived = SystemClock.elapsedRealtime();
 730		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 731			Log.d(Config.LOGTAG,"[background stanza] "+element);
 732		}
 733		return element;
 734	}
 735
 736	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 737		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 738
 739		if (packet.getId() == null) {
 740			return; // an iq packet without id is definitely invalid
 741		}
 742
 743		if (packet instanceof JinglePacket) {
 744			if (this.jingleListener != null) {
 745				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 746			}
 747		} else {
 748			OnIqPacketReceived callback = null;
 749			synchronized (this.packetCallbacks) {
 750				if (packetCallbacks.containsKey(packet.getId())) {
 751					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 752					// Packets to the server should have responses from the server
 753					if (packetCallbackDuple.first.toServer(account)) {
 754						if (packet.fromServer(account)) {
 755							callback = packetCallbackDuple.second;
 756							packetCallbacks.remove(packet.getId());
 757						} else {
 758							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 759						}
 760					} else {
 761						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 762							callback = packetCallbackDuple.second;
 763							packetCallbacks.remove(packet.getId());
 764						} else {
 765							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 766						}
 767					}
 768				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 769					callback = this.unregisteredIqListener;
 770				}
 771			}
 772			if (callback != null) {
 773				try {
 774					callback.onIqPacketReceived(account, packet);
 775				} catch (StateChangingError error) {
 776					throw new StateChangingException(error.state);
 777				}
 778			}
 779		}
 780	}
 781
 782	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 783		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 784		this.messageListener.onMessagePacketReceived(account, packet);
 785	}
 786
 787	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 788		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 789		this.presenceListener.onPresencePacketReceived(account, packet);
 790	}
 791
 792	private void sendStartTLS() throws IOException {
 793		final Tag startTLS = Tag.empty("starttls");
 794		startTLS.setAttribute("xmlns", Namespace.TLS);
 795		tagWriter.writeTag(startTLS);
 796	}
 797
 798
 799
 800	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 801		tagReader.readTag();
 802		try {
 803			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 804			final InetAddress address = socket == null ? null : socket.getInetAddress();
 805
 806			if (address == null) {
 807				throw new IOException("could not setup ssl");
 808			}
 809
 810			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 811
 812			if (sslSocket == null) {
 813				throw new IOException("could not initialize ssl socket");
 814			}
 815
 816			SSLSocketHelper.setSecurity(sslSocket);
 817
 818			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), this.verifiedHostname, sslSocket.getSession())) {
 819				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 820				throw new StateChangingException(Account.State.TLS_ERROR);
 821			}
 822			tagReader.setInputStream(sslSocket.getInputStream());
 823			tagWriter.setOutputStream(sslSocket.getOutputStream());
 824			sendStartStream();
 825			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 826			features.encryptionEnabled = true;
 827			final Tag tag = tagReader.readTag();
 828			if (tag != null && tag.isStart("stream")) {
 829				processStream();
 830			} else {
 831				throw new IOException("server didn't restart stream after STARTTLS");
 832			}
 833			sslSocket.close();
 834		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 835			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 836			throw new StateChangingException(Account.State.TLS_ERROR);
 837		}
 838	}
 839
 840	private void processStreamFeatures(final Tag currentTag)
 841		throws XmlPullParserException, IOException {
 842		this.streamFeatures = tagReader.readElement(currentTag);
 843		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 844			sendStartTLS();
 845		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 846			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 847				sendRegistryRequest();
 848			} else {
 849				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 850			}
 851		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 852			throw new StateChangingException(Account.State.REGISTRATION_NOT_SUPPORTED);
 853		} else if (this.streamFeatures.hasChild("mechanisms")
 854				&& shouldAuthenticate
 855				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 856			authenticate();
 857		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 858			if (Config.EXTENDED_SM_LOGGING) {
 859				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 860			}
 861			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 862			this.mSmCatchupMessageCounter.set(0);
 863			this.mWaitingForSmCatchup.set(true);
 864			this.tagWriter.writeStanzaAsync(resume);
 865		} else if (needsBinding) {
 866			if (this.streamFeatures.hasChild("bind")) {
 867				sendBindRequest();
 868			} else {
 869				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 870			}
 871		}
 872	}
 873
 874	private void authenticate() throws IOException {
 875		final List<String> mechanisms = extractMechanisms(streamFeatures
 876				.findChild("mechanisms"));
 877		final Element auth = new Element("auth",Namespace.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 StateChangingException(Account.State.DOWNGRADE_ATTACK);
 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 StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 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 query = packet.query();
 975					final String instructions = query.findChildContent("instructions");
 976					final Element oob = query.findChild("x",Namespace.OOB);
 977					final String url = oob == null ? null : oob.findChildContent("url");
 978					if (url == null && instructions != null) {
 979						Matcher matcher = Patterns.AUTOLINK_WEB_URL.matcher(instructions);
 980						if (matcher.find()) {
 981							setAccountCreationFailed(instructions.substring(matcher.start(),matcher.end()));
 982						} else {
 983							setAccountCreationFailed(null);
 984						}
 985					} else {
 986						setAccountCreationFailed(url);
 987					}
 988				}
 989			}
 990		});
 991	}
 992
 993	private void setAccountCreationFailed(String url) {
 994		if (url != null && (url.toLowerCase().startsWith("http://") || url.toLowerCase().startsWith("https://"))) {
 995			changeStatus(Account.State.REGISTRATION_WEB);
 996			this.webRegistrationUrl = url;
 997		} else {
 998			changeStatus(Account.State.REGISTRATION_FAILED);
 999		}
1000		disconnect(true);
1001		Log.d(Config.LOGTAG, account.getJid().toBareJid()+": could not register. url="+url);
1002	}
1003
1004	public String getWebRegistrationUrl() {
1005		return this.webRegistrationUrl;
1006	}
1007
1008	public void resetEverything() {
1009		resetAttemptCount(true);
1010		resetStreamId();
1011		clearIqCallbacks();
1012		mStanzaQueue.clear();
1013		this.webRegistrationUrl = null;
1014		synchronized (this.disco) {
1015			disco.clear();
1016		}
1017	}
1018
1019	private void sendBindRequest() {
1020		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
1021			try {
1022				Thread.sleep(500);
1023			} catch (final InterruptedException ignored) {
1024			}
1025		}
1026		needsBinding = false;
1027		clearIqCallbacks();
1028		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1029		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1030				.addChild("resource").setContent(account.getResource());
1031		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1032			@Override
1033			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1034				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1035					return;
1036				}
1037				final Element bind = packet.findChild("bind");
1038				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1039					final Element jid = bind.findChild("jid");
1040					if (jid != null && jid.getContent() != null) {
1041						try {
1042							if (account.setJid(Jid.fromString(jid.getContent()))) {
1043								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1044								mXmppConnectionService.databaseBackend.updateAccount(account);
1045							}
1046							if (streamFeatures.hasChild("session")
1047									&& !streamFeatures.findChild("session").hasChild("optional")) {
1048								sendStartSession();
1049							} else {
1050								sendPostBindInitialization();
1051							}
1052							return;
1053						} catch (final InvalidJidException e) {
1054							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1055						}
1056					} else {
1057						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1058					}
1059				} else {
1060					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1061				}
1062				final Element error = packet.findChild("error");
1063				final String resource = account.getResource().split("\\.")[0];
1064				if (packet.getType() == IqPacket.TYPE.ERROR && error != null && error.hasChild("conflict")) {
1065					account.setResource(resource + "." + nextRandomId());
1066				} else {
1067					account.setResource(resource);
1068				}
1069				throw new StateChangingError(Account.State.BIND_FAILURE);
1070			}
1071		});
1072	}
1073
1074	private void clearIqCallbacks() {
1075		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1076		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1077		synchronized (this.packetCallbacks) {
1078			if (this.packetCallbacks.size() == 0) {
1079				return;
1080			}
1081			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1082			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1083			while (iterator.hasNext()) {
1084				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1085				callbacks.add(entry.second);
1086				iterator.remove();
1087			}
1088		}
1089		for(OnIqPacketReceived callback : callbacks) {
1090			try {
1091				callback.onIqPacketReceived(account, failurePacket);
1092			} catch (StateChangingError error) {
1093				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": caught StateChangingError("+error.state.toString()+") while clearing callbacks");
1094				//ignore
1095			}
1096		}
1097		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1098	}
1099
1100	public void sendDiscoTimeout() {
1101		if (mWaitForDisco.compareAndSet(true, false)) {
1102			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": finalizing bind after disco timeout");
1103			finalizeBind();
1104		}
1105	}
1106
1107	private void sendStartSession() {
1108		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1109		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1110		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1111		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1112			@Override
1113			public void onIqPacketReceived(Account account, IqPacket packet) {
1114				if (packet.getType() == IqPacket.TYPE.RESULT) {
1115					sendPostBindInitialization();
1116				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1117					throw new StateChangingError(Account.State.SESSION_FAILURE);
1118				}
1119			}
1120		});
1121	}
1122
1123	private void sendPostBindInitialization() {
1124		smVersion = 0;
1125		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1126			smVersion = 3;
1127		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1128			smVersion = 2;
1129		}
1130		if (smVersion != 0) {
1131			synchronized (this.mStanzaQueue) {
1132				final EnablePacket enable = new EnablePacket(smVersion);
1133				tagWriter.writeStanzaAsync(enable);
1134				stanzasSent = 0;
1135				mStanzaQueue.clear();
1136			}
1137		}
1138		features.carbonsEnabled = false;
1139		features.blockListRequested = false;
1140		synchronized (this.disco) {
1141			this.disco.clear();
1142		}
1143		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1144		mPendingServiceDiscoveries.set(0);
1145		if (smVersion == 0 || Patches.DISCO_EXCEPTIONS.contains(account.getJid().getDomainpart())) {
1146			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": do not wait for service discovery");
1147			mWaitForDisco.set(false);
1148		} else {
1149			mWaitForDisco.set(true);
1150		}
1151		lastDiscoStarted = SystemClock.elapsedRealtime();
1152		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1153		Element caps = streamFeatures.findChild("c");
1154		final String hash = caps == null ? null : caps.getAttribute("hash");
1155		final String ver = caps == null ? null : caps.getAttribute("ver");
1156		ServiceDiscoveryResult discoveryResult = null;
1157		if (hash != null && ver != null) {
1158			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1159		}
1160		if (discoveryResult == null) {
1161			sendServiceDiscoveryInfo(account.getServer());
1162		} else {
1163			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1164			disco.put(account.getServer(), discoveryResult);
1165		}
1166		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1167		sendServiceDiscoveryItems(account.getServer());
1168
1169		if (!mWaitForDisco.get()) {
1170			finalizeBind();
1171		}
1172		this.lastSessionStarted = SystemClock.elapsedRealtime();
1173	}
1174
1175	private void sendServiceDiscoveryInfo(final Jid jid) {
1176		mPendingServiceDiscoveries.incrementAndGet();
1177		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1178		iq.setTo(jid);
1179		iq.query("http://jabber.org/protocol/disco#info");
1180		this.sendIqPacket(iq, new OnIqPacketReceived() {
1181
1182			@Override
1183			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1184				if (packet.getType() == IqPacket.TYPE.RESULT) {
1185					boolean advancedStreamFeaturesLoaded;
1186					synchronized (XmppConnection.this.disco) {
1187						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1188						if (jid.equals(account.getServer())) {
1189							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1190						}
1191						disco.put(jid, result);
1192						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1193								&& disco.containsKey(account.getJid().toBareJid());
1194					}
1195					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1196						enableAdvancedStreamFeatures();
1197					}
1198				} else {
1199					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1200				}
1201				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1202					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1203							&& mWaitForDisco.compareAndSet(true, false)) {
1204						finalizeBind();
1205					}
1206				}
1207			}
1208		});
1209	}
1210
1211	private void finalizeBind() {
1212		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1213		if (bindListener != null) {
1214			bindListener.onBind(account);
1215		}
1216		changeStatus(Account.State.ONLINE);
1217	}
1218
1219	private void enableAdvancedStreamFeatures() {
1220		if (getFeatures().carbons() && !features.carbonsEnabled) {
1221			sendEnableCarbons();
1222		}
1223		if (getFeatures().blocking() && !features.blockListRequested) {
1224			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1225			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1226		}
1227		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1228			listener.onAdvancedStreamFeaturesAvailable(account);
1229		}
1230	}
1231
1232	private void sendServiceDiscoveryItems(final Jid server) {
1233		mPendingServiceDiscoveries.incrementAndGet();
1234		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1235		iq.setTo(server.toDomainJid());
1236		iq.query("http://jabber.org/protocol/disco#items");
1237		this.sendIqPacket(iq, new OnIqPacketReceived() {
1238
1239			@Override
1240			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1241				if (packet.getType() == IqPacket.TYPE.RESULT) {
1242					HashSet<Jid> items = new HashSet<Jid>();
1243					final List<Element> elements = packet.query().getChildren();
1244					for (final Element element : elements) {
1245						if (element.getName().equals("item")) {
1246							final Jid jid = element.getAttributeAsJid("jid");
1247							if (jid != null && !jid.equals(account.getServer())) {
1248								items.add(jid);
1249							}
1250						}
1251					}
1252					for(Jid jid : items) {
1253						sendServiceDiscoveryInfo(jid);
1254					}
1255				} else {
1256					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1257				}
1258				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1259					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1260							&& mWaitForDisco.compareAndSet(true, false)) {
1261						finalizeBind();
1262					}
1263				}
1264			}
1265		});
1266	}
1267
1268	private void sendEnableCarbons() {
1269		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1270		iq.addChild("enable", "urn:xmpp:carbons:2");
1271		this.sendIqPacket(iq, new OnIqPacketReceived() {
1272
1273			@Override
1274			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1275				if (!packet.hasChild("error")) {
1276					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1277							+ ": successfully enabled carbons");
1278					features.carbonsEnabled = true;
1279				} else {
1280					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1281							+ ": error enableing carbons " + packet.toString());
1282				}
1283			}
1284		});
1285	}
1286
1287	private void processStreamError(final Tag currentTag)
1288		throws XmlPullParserException, IOException {
1289		final Element streamError = tagReader.readElement(currentTag);
1290		if (streamError == null) {
1291			return;
1292		}
1293		if (streamError.hasChild("conflict")) {
1294			final String resource = account.getResource().split("\\.")[0];
1295			account.setResource(resource + "." + nextRandomId());
1296			Log.d(Config.LOGTAG,
1297					account.getJid().toBareJid() + ": switching resource due to conflict ("
1298					+ account.getResource() + ")");
1299			throw new IOException();
1300		} else if (streamError.hasChild("host-unknown")) {
1301			throw new StateChangingException(Account.State.HOST_UNKNOWN);
1302		} else if (streamError.hasChild("policy-violation")) {
1303			throw new StateChangingException(Account.State.POLICY_VIOLATION);
1304		} else {
1305			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1306			throw new StateChangingException(Account.State.STREAM_ERROR);
1307		}
1308	}
1309
1310	private void sendStartStream() throws IOException {
1311		final Tag stream = Tag.start("stream:stream");
1312		stream.setAttribute("to", account.getServer().toString());
1313		stream.setAttribute("version", "1.0");
1314		stream.setAttribute("xml:lang", "en");
1315		stream.setAttribute("xmlns", "jabber:client");
1316		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1317		tagWriter.writeTag(stream);
1318	}
1319
1320	private String nextRandomId() {
1321		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(36);
1322	}
1323
1324	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1325		packet.setFrom(account.getJid());
1326		return this.sendUnmodifiedIqPacket(packet, callback);
1327	}
1328
1329	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1330		if (packet.getId() == null) {
1331			packet.setAttribute("id", nextRandomId());
1332		}
1333		if (callback != null) {
1334			synchronized (this.packetCallbacks) {
1335				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1336			}
1337		}
1338		this.sendPacket(packet);
1339		return packet.getId();
1340	}
1341
1342	public void sendMessagePacket(final MessagePacket packet) {
1343		this.sendPacket(packet);
1344	}
1345
1346	public void sendPresencePacket(final PresencePacket packet) {
1347		this.sendPacket(packet);
1348	}
1349
1350	private synchronized void sendPacket(final AbstractStanza packet) {
1351		if (stanzasSent == Integer.MAX_VALUE) {
1352			resetStreamId();
1353			disconnect(true);
1354			return;
1355		}
1356		synchronized (this.mStanzaQueue) {
1357			tagWriter.writeStanzaAsync(packet);
1358			if (packet instanceof AbstractAcknowledgeableStanza) {
1359				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1360				++stanzasSent;
1361				this.mStanzaQueue.append(stanzasSent, stanza);
1362				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1363					if (Config.EXTENDED_SM_LOGGING) {
1364						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1365					}
1366					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1367				}
1368			}
1369		}
1370	}
1371
1372	public void sendPing() {
1373		if (!r()) {
1374			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1375			iq.setFrom(account.getJid());
1376			iq.addChild("ping", "urn:xmpp:ping");
1377			this.sendIqPacket(iq, null);
1378		}
1379		this.lastPingSent = SystemClock.elapsedRealtime();
1380	}
1381
1382	public void setOnMessagePacketReceivedListener(
1383			final OnMessagePacketReceived listener) {
1384		this.messageListener = listener;
1385			}
1386
1387	public void setOnUnregisteredIqPacketReceivedListener(
1388			final OnIqPacketReceived listener) {
1389		this.unregisteredIqListener = listener;
1390			}
1391
1392	public void setOnPresencePacketReceivedListener(
1393			final OnPresencePacketReceived listener) {
1394		this.presenceListener = listener;
1395			}
1396
1397	public void setOnJinglePacketReceivedListener(
1398			final OnJinglePacketReceived listener) {
1399		this.jingleListener = listener;
1400			}
1401
1402	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1403		this.statusListener = listener;
1404	}
1405
1406	public void setOnBindListener(final OnBindListener listener) {
1407		this.bindListener = listener;
1408	}
1409
1410	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1411		this.acknowledgedListener = listener;
1412	}
1413
1414	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1415		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1416			this.advancedStreamFeaturesLoadedListeners.add(listener);
1417		}
1418	}
1419
1420	private void forceCloseSocket() {
1421		if (socket != null) {
1422			try {
1423				socket.close();
1424			} catch (IOException e) {
1425				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1426			}
1427		} else {
1428			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1429		}
1430	}
1431
1432	public void interrupt() {
1433		Thread.currentThread().interrupt();
1434	}
1435
1436	public void disconnect(final boolean force) {
1437		interrupt();
1438		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1439		if (force) {
1440			forceCloseSocket();
1441		} else {
1442			if (tagWriter.isActive()) {
1443				tagWriter.finish();
1444				try {
1445					int i = 0;
1446					boolean warned = false;
1447					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1448						if (!warned) {
1449							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1450							warned = true;
1451						}
1452						try {
1453							Thread.sleep(200);
1454						} catch(InterruptedException e) {
1455							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1456						}
1457						i++;
1458					}
1459					if (warned) {
1460						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1461					}
1462					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1463					tagWriter.writeTag(Tag.end("stream:stream"));
1464				} catch (final IOException e) {
1465					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1466				} finally {
1467					forceCloseSocket();
1468				}
1469			}
1470		}
1471	}
1472
1473	public void resetStreamId() {
1474		this.streamId = null;
1475	}
1476
1477	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1478		synchronized (this.disco) {
1479			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1480			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1481				if (cursor.getValue().getFeatures().contains(feature)) {
1482					items.add(cursor);
1483				}
1484			}
1485			return items;
1486		}
1487	}
1488
1489	public Jid findDiscoItemByFeature(final String feature) {
1490		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1491		if (items.size() >= 1) {
1492			return items.get(0).getKey();
1493		}
1494		return null;
1495	}
1496
1497	public boolean r() {
1498		if (getFeatures().sm()) {
1499			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1500			return true;
1501		} else {
1502			return false;
1503		}
1504	}
1505
1506	public String getMucServer() {
1507		synchronized (this.disco) {
1508			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1509				final ServiceDiscoveryResult value = cursor.getValue();
1510				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1511						&& !value.getFeatures().contains("jabber:iq:gateway")
1512						&& !value.hasIdentity("conference", "irc")) {
1513					return cursor.getKey().toString();
1514				}
1515			}
1516		}
1517		return null;
1518	}
1519
1520	public int getTimeToNextAttempt() {
1521		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1522		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1523		return interval - secondsSinceLast;
1524	}
1525
1526	public int getAttempt() {
1527		return this.attempt;
1528	}
1529
1530	public Features getFeatures() {
1531		return this.features;
1532	}
1533
1534	public long getLastSessionEstablished() {
1535		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1536		return System.currentTimeMillis() - diff;
1537	}
1538
1539	public long getLastConnect() {
1540		return this.lastConnect;
1541	}
1542
1543	public long getLastPingSent() {
1544		return this.lastPingSent;
1545	}
1546
1547	public long getLastDiscoStarted() {
1548		return this.lastDiscoStarted;
1549	}
1550	public long getLastPacketReceived() {
1551		return this.lastPacketReceived;
1552	}
1553
1554	public void sendActive() {
1555		this.sendPacket(new ActivePacket());
1556	}
1557
1558	public void sendInactive() {
1559		this.sendPacket(new InactivePacket());
1560	}
1561
1562	public void resetAttemptCount(boolean resetConnectTime) {
1563		this.attempt = 0;
1564		if (resetConnectTime) {
1565			this.lastConnect = 0;
1566		}
1567	}
1568
1569	public void setInteractive(boolean interactive) {
1570		this.mInteractive = interactive;
1571	}
1572
1573	public Identity getServerIdentity() {
1574		synchronized (this.disco) {
1575			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1576			if (result == null) {
1577				return Identity.UNKNOWN;
1578			}
1579			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1580				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1581					switch (id.getName()) {
1582						case "Prosody":
1583							return Identity.PROSODY;
1584						case "ejabberd":
1585							return Identity.EJABBERD;
1586						case "Slack-XMPP":
1587							return Identity.SLACK;
1588					}
1589				}
1590			}
1591		}
1592		return Identity.UNKNOWN;
1593	}
1594
1595	private class StateChangingError extends Error {
1596		private final Account.State state;
1597
1598		public StateChangingError(Account.State state) {
1599			this.state = state;
1600		}
1601	}
1602
1603	private class StateChangingException extends IOException {
1604		private final Account.State state;
1605
1606		public StateChangingException(Account.State state) {
1607			this.state = state;
1608		}
1609	}
1610
1611	public enum Identity {
1612		FACEBOOK,
1613		SLACK,
1614		EJABBERD,
1615		PROSODY,
1616		NIMBUZZ,
1617		UNKNOWN
1618	}
1619
1620	public class Features {
1621		XmppConnection connection;
1622		private boolean carbonsEnabled = false;
1623		private boolean encryptionEnabled = false;
1624		private boolean blockListRequested = false;
1625
1626		public Features(final XmppConnection connection) {
1627			this.connection = connection;
1628		}
1629
1630		private boolean hasDiscoFeature(final Jid server, final String feature) {
1631			synchronized (XmppConnection.this.disco) {
1632				return connection.disco.containsKey(server) &&
1633						connection.disco.get(server).getFeatures().contains(feature);
1634			}
1635		}
1636
1637		public boolean carbons() {
1638			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1639		}
1640
1641		public boolean blocking() {
1642			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1643		}
1644
1645		public boolean spamReporting() {
1646			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1647		}
1648
1649		public boolean register() {
1650			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1651		}
1652
1653		public boolean sm() {
1654			return streamId != null
1655					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1656		}
1657
1658		public boolean csi() {
1659			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1660		}
1661
1662		public boolean pep() {
1663			synchronized (XmppConnection.this.disco) {
1664				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1665				return info != null && info.hasIdentity("pubsub", "pep");
1666			}
1667		}
1668
1669		public boolean pepPersistent() {
1670			synchronized (XmppConnection.this.disco) {
1671				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1672				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1673			}
1674		}
1675
1676		public boolean mam() {
1677			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1678					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1679		}
1680
1681		public boolean mamLegacy() {
1682			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1683					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1684		}
1685
1686		public boolean push() {
1687			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1688					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1689		}
1690
1691		public boolean rosterVersioning() {
1692			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1693		}
1694
1695		public void setBlockListRequested(boolean value) {
1696			this.blockListRequested = value;
1697		}
1698
1699		public boolean httpUpload(long filesize) {
1700			if (Config.DISABLE_HTTP_UPLOAD) {
1701				return false;
1702			} else {
1703				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1704				if (items.size() > 0) {
1705					try {
1706						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1707						if(filesize <= maxsize) {
1708							return true;
1709						} else {
1710							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1711							return false;
1712						}
1713					} catch (Exception e) {
1714						return true;
1715					}
1716				} else {
1717					return false;
1718				}
1719			}
1720		}
1721
1722		public long getMaxHttpUploadSize() {
1723			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1724				if (items.size() > 0) {
1725					try {
1726						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1727					} catch (Exception e) {
1728						return -1;
1729					}
1730				} else {
1731					return -1;
1732				}
1733		}
1734
1735		public boolean stanzaIds() {
1736			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1737		}
1738	}
1739
1740	private IqGenerator getIqGenerator() {
1741		return mXmppConnectionService.getIqGenerator();
1742	}
1743}