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.InetAddress;
  22import java.net.InetSocketAddress;
  23import java.net.Socket;
  24import java.net.URL;
  25import java.net.UnknownHostException;
  26import java.security.KeyManagementException;
  27import java.security.NoSuchAlgorithmException;
  28import java.security.Principal;
  29import java.security.PrivateKey;
  30import java.security.cert.X509Certificate;
  31import java.util.ArrayList;
  32import java.util.Arrays;
  33import java.util.HashMap;
  34import java.util.Hashtable;
  35import java.util.Iterator;
  36import java.util.List;
  37import java.util.Map.Entry;
  38import java.util.concurrent.atomic.AtomicBoolean;
  39import java.util.concurrent.atomic.AtomicInteger;
  40import java.util.regex.Matcher;
  41
  42import javax.net.ssl.HostnameVerifier;
  43import javax.net.ssl.KeyManager;
  44import javax.net.ssl.SSLContext;
  45import javax.net.ssl.SSLSession;
  46import javax.net.ssl.SSLSocket;
  47import javax.net.ssl.SSLSocketFactory;
  48import javax.net.ssl.X509KeyManager;
  49import javax.net.ssl.X509TrustManager;
  50
  51import de.duenndns.ssl.MemorizingTrustManager;
  52import eu.siacs.conversations.Config;
  53import eu.siacs.conversations.crypto.XmppDomainVerifier;
  54import eu.siacs.conversations.crypto.sasl.Anonymous;
  55import eu.siacs.conversations.crypto.sasl.DigestMd5;
  56import eu.siacs.conversations.crypto.sasl.External;
  57import eu.siacs.conversations.crypto.sasl.Plain;
  58import eu.siacs.conversations.crypto.sasl.SaslMechanism;
  59import eu.siacs.conversations.crypto.sasl.ScramSha1;
  60import eu.siacs.conversations.crypto.sasl.ScramSha256;
  61import eu.siacs.conversations.entities.Account;
  62import eu.siacs.conversations.entities.Message;
  63import eu.siacs.conversations.entities.ServiceDiscoveryResult;
  64import eu.siacs.conversations.generator.IqGenerator;
  65import eu.siacs.conversations.services.NotificationService;
  66import eu.siacs.conversations.services.XmppConnectionService;
  67import eu.siacs.conversations.utils.IP;
  68import eu.siacs.conversations.utils.Patterns;
  69import eu.siacs.conversations.utils.Resolver;
  70import eu.siacs.conversations.utils.SSLSocketHelper;
  71import eu.siacs.conversations.utils.SocksSocketFactory;
  72import eu.siacs.conversations.xml.Element;
  73import eu.siacs.conversations.xml.Tag;
  74import eu.siacs.conversations.xml.TagWriter;
  75import eu.siacs.conversations.xml.XmlReader;
  76import eu.siacs.conversations.xml.Namespace;
  77import eu.siacs.conversations.xmpp.forms.Data;
  78import eu.siacs.conversations.xmpp.forms.Field;
  79import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  80import eu.siacs.conversations.xmpp.jid.Jid;
  81import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
  82import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
  83import eu.siacs.conversations.xmpp.stanzas.AbstractAcknowledgeableStanza;
  84import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
  85import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  86import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  87import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
  88import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
  89import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
  90import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
  91import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
  92import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
  93import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
  94
  95public class XmppConnection implements Runnable {
  96
  97	private static final int PACKET_IQ = 0;
  98	private static final int PACKET_MESSAGE = 1;
  99	private static final int PACKET_PRESENCE = 2;
 100	protected final Account account;
 101	private final WakeLock wakeLock;
 102	private Socket socket;
 103	private XmlReader tagReader;
 104	private TagWriter tagWriter = new TagWriter();
 105	private final Features features = new Features(this);
 106	private boolean needsBinding = true;
 107	private boolean shouldAuthenticate = true;
 108	private Element streamFeatures;
 109	private final HashMap<Jid, ServiceDiscoveryResult> disco = new HashMap<>();
 110
 111	private String streamId = null;
 112	private int smVersion = 3;
 113	private final SparseArray<AbstractAcknowledgeableStanza> mStanzaQueue = new SparseArray<>();
 114
 115	private int stanzasReceived = 0;
 116	private int stanzasSent = 0;
 117	private long lastPacketReceived = 0;
 118	private long lastPingSent = 0;
 119	private long lastConnect = 0;
 120	private long lastSessionStarted = 0;
 121	private long lastDiscoStarted = 0;
 122	private AtomicInteger mPendingServiceDiscoveries = new AtomicInteger(0);
 123	private AtomicBoolean mWaitForDisco = new AtomicBoolean(true);
 124	private AtomicBoolean mWaitingForSmCatchup = new AtomicBoolean(false);
 125	private AtomicInteger mSmCatchupMessageCounter = new AtomicInteger(0);
 126	private boolean mInteractive = false;
 127	private int attempt = 0;
 128	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 129	private OnPresencePacketReceived presenceListener = null;
 130	private OnJinglePacketReceived jingleListener = null;
 131	private OnIqPacketReceived unregisteredIqListener = null;
 132	private OnMessagePacketReceived messageListener = null;
 133	private OnStatusChanged statusListener = null;
 134	private OnBindListener bindListener = null;
 135	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 136	private OnMessageAcknowledged acknowledgedListener = null;
 137	private final XmppConnectionService mXmppConnectionService;
 138
 139	private SaslMechanism saslMechanism;
 140	private String webRegistrationUrl = null;
 141
 142	private class MyKeyManager implements X509KeyManager {
 143		@Override
 144		public String chooseClientAlias(String[] strings, Principal[] principals, Socket socket) {
 145			return account.getPrivateKeyAlias();
 146		}
 147
 148		@Override
 149		public String chooseServerAlias(String s, Principal[] principals, Socket socket) {
 150			return null;
 151		}
 152
 153		@Override
 154		public X509Certificate[] getCertificateChain(String alias) {
 155			Log.d(Config.LOGTAG,"getting certificate chain");
 156			try {
 157				return KeyChain.getCertificateChain(mXmppConnectionService, alias);
 158			} catch (Exception e) {
 159				Log.d(Config.LOGTAG,e.getMessage());
 160				return new X509Certificate[0];
 161			}
 162		}
 163
 164		@Override
 165		public String[] getClientAliases(String s, Principal[] principals) {
 166			final String alias = account.getPrivateKeyAlias();
 167			return alias != null ? new String[]{alias} : new String[0];
 168		}
 169
 170		@Override
 171		public String[] getServerAliases(String s, Principal[] principals) {
 172			return new String[0];
 173		}
 174
 175		@Override
 176		public PrivateKey getPrivateKey(String alias) {
 177			try {
 178				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 179			} catch (Exception e) {
 180				return null;
 181			}
 182		}
 183	}
 184
 185	public final OnIqPacketReceived registrationResponseListener =  new OnIqPacketReceived() {
 186		@Override
 187		public void onIqPacketReceived(Account account, IqPacket packet) {
 188			if (packet.getType() == IqPacket.TYPE.RESULT) {
 189				account.setOption(Account.OPTION_REGISTER, false);
 190				forceCloseSocket();
 191				changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 192			} else {
 193				final List<String> PASSWORD_TOO_WEAK_MSGS = Arrays.asList(
 194						"The password is too weak",
 195						"Please use a longer password.");
 196				Element error = packet.findChild("error");
 197				Account.State state = Account.State.REGISTRATION_FAILED;
 198				if (error != null) {
 199					if (error.hasChild("conflict")) {
 200						state = Account.State.REGISTRATION_CONFLICT;
 201					} else if (error.hasChild("resource-constraint")
 202							&& "wait".equals(error.getAttribute("type"))) {
 203						state = Account.State.REGISTRATION_PLEASE_WAIT;
 204					} else if (error.hasChild("not-acceptable")
 205							&& PASSWORD_TOO_WEAK_MSGS.contains(error.findChildContent("text"))) {
 206						state = Account.State.REGISTRATION_PASSWORD_TOO_WEAK;
 207					}
 208				}
 209				changeStatus(state);
 210				forceCloseSocket();
 211			}
 212		}
 213	};
 214
 215	public XmppConnection(final Account account, final XmppConnectionService service) {
 216		this.account = account;
 217		this.wakeLock = service.getPowerManager().newWakeLock(
 218				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 219		mXmppConnectionService = service;
 220	}
 221
 222	protected void changeStatus(final Account.State nextStatus) {
 223		synchronized (this) {
 224			if (Thread.currentThread().isInterrupted()) {
 225				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": not changing status to " + nextStatus + " because thread was interrupted");
 226				return;
 227			}
 228			if (account.getStatus() != nextStatus) {
 229				if ((nextStatus == Account.State.OFFLINE)
 230						&& (account.getStatus() != Account.State.CONNECTING)
 231						&& (account.getStatus() != Account.State.ONLINE)
 232						&& (account.getStatus() != Account.State.DISABLED)) {
 233					return;
 234				}
 235				if (nextStatus == Account.State.ONLINE) {
 236					this.attempt = 0;
 237				}
 238				account.setStatus(nextStatus);
 239			} else {
 240				return;
 241			}
 242		}
 243		if (statusListener != null) {
 244			statusListener.onStatusChanged(account);
 245		}
 246	}
 247
 248	public void prepareNewConnection() {
 249		this.lastConnect = SystemClock.elapsedRealtime();
 250		this.lastPingSent = SystemClock.elapsedRealtime();
 251		this.lastDiscoStarted = Long.MAX_VALUE;
 252		this.mWaitingForSmCatchup.set(false);
 253		this.changeStatus(Account.State.CONNECTING);
 254	}
 255
 256	public boolean isWaitingForSmCatchup() {
 257		return mWaitingForSmCatchup.get();
 258	}
 259
 260	public void incrementSmCatchupMessageCounter() {
 261		this.mSmCatchupMessageCounter.incrementAndGet();
 262	}
 263
 264	protected void connect() {
 265		if (mXmppConnectionService.areMessagesInitialized()) {
 266			mXmppConnectionService.resetSendingToWaiting(account);
 267		}
 268		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 269		features.encryptionEnabled = false;
 270		this.attempt++;
 271		try {
 272			Socket localSocket;
 273			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 274			this.changeStatus(Account.State.CONNECTING);
 275			final boolean useTor = mXmppConnectionService.useTorToConnect() || account.isOnion();
 276			final boolean extended = mXmppConnectionService.showExtendedConnectionOptions();
 277			if (useTor) {
 278				String destination;
 279				if (account.getHostname() == null || account.getHostname().isEmpty()) {
 280					destination = account.getServer().toString();
 281				} else {
 282					destination = account.getHostname();
 283				}
 284				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": connect to " + destination + " via Tor");
 285				localSocket = SocksSocketFactory.createSocketOverTor(destination, account.getPort());
 286				try {
 287					startXmpp(localSocket);
 288				} catch (InterruptedException e) {
 289					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 290					return;
 291				} catch (Exception e) {
 292					throw new IOException(e.getMessage());
 293				}
 294			} else if (extended && account.getHostname() != null && !account.getHostname().isEmpty()) {
 295
 296				InetSocketAddress address = new InetSocketAddress(account.getHostname(), account.getPort());
 297
 298				features.encryptionEnabled = account.getPort() == 5223;
 299
 300				try {
 301					if (features.encryptionEnabled) {
 302						try {
 303							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 304							localSocket = tlsFactoryVerifier.factory.createSocket();
 305							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 306							final SSLSession session = ((SSLSocket) localSocket).getSession();
 307							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), session)) {
 308								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 309								throw new StateChangingException(Account.State.TLS_ERROR);
 310							}
 311						} catch (KeyManagementException e) {
 312							features.encryptionEnabled = false;
 313							localSocket = new Socket();
 314						}
 315					} else {
 316						localSocket = new Socket();
 317						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 318					}
 319				} catch (IOException e) {
 320					throw new UnknownHostException();
 321				}
 322				try {
 323					startXmpp(localSocket);
 324				} catch (InterruptedException e) {
 325					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 326					return;
 327				} catch (Exception e) {
 328					throw new IOException(e.getMessage());
 329				}
 330			} else if (IP.matches(account.getServer().toString())) {
 331				localSocket = new Socket();
 332				try {
 333					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 334				} catch (IOException e) {
 335					throw new UnknownHostException();
 336				}
 337				try {
 338					startXmpp(localSocket);
 339				} catch (InterruptedException e) {
 340					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 341					return;
 342				} catch (Exception e) {
 343					throw new IOException(e.getMessage());
 344				}
 345			} else {
 346				List<Resolver.Result> results = Resolver.resolve(account.getJid().getDomainpart());
 347				Log.d(Config.LOGTAG,"results: "+results);
 348				for (Iterator<Resolver.Result> iterator = results.iterator(); iterator.hasNext(); ) {
 349					final Resolver.Result result = iterator.next();
 350					if (Thread.currentThread().isInterrupted()) {
 351						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 352						return;
 353					}
 354					try {
 355						// if tls is true, encryption is implied and must not be started
 356						features.encryptionEnabled = result.isDirectTls();
 357						final InetSocketAddress addr;
 358						if (result.getIp() != null) {
 359							addr = new InetSocketAddress(result.getIp(), result.getPort());
 360							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 361									+ ": using values from dns " + result.getHostname().toString()
 362									+ "[" + result.getIp().toString() + "]:" + result.getPort() + " tls: " + features.encryptionEnabled);
 363						} else {
 364							addr = new InetSocketAddress(result.getHostname().toString(), result.getPort());
 365							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 366									+ ": using values from dns "
 367									+ result.getHostname().toString() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
 368						}
 369
 370						if (!features.encryptionEnabled) {
 371							localSocket = new Socket();
 372							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 373						} else {
 374							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 375							localSocket = tlsFactoryVerifier.factory.createSocket();
 376
 377							if (localSocket == null) {
 378								throw new IOException("could not initialize ssl socket");
 379							}
 380
 381							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 382							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 383							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 384
 385							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 386
 387							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), ((SSLSocket) localSocket).getSession())) {
 388								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 389								throw new StateChangingException(Account.State.TLS_ERROR);
 390							}
 391						}
 392						if (startXmpp(localSocket)) {
 393							break; // successfully connected to server that speaks xmpp
 394						} else {
 395							localSocket.close();
 396						}
 397					} catch (final StateChangingException e) {
 398						throw e;
 399					} catch (InterruptedException e) {
 400						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 401						return;
 402					} catch (final Throwable e) {
 403						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 404						if (!iterator.hasNext()) {
 405							throw new UnknownHostException();
 406						}
 407					}
 408				}
 409			}
 410			processStream();
 411		}  catch (final SecurityException e) {
 412			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 413		} catch(final StateChangingException e) {
 414			this.changeStatus(e.state);
 415		} catch (final UnknownHostException | ConnectException e) {
 416			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 417		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 418			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 419		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 420			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 421			this.changeStatus(Account.State.OFFLINE);
 422			this.attempt = Math.max(0, this.attempt - 1);
 423		} finally {
 424			if (!Thread.currentThread().isInterrupted()) {
 425				forceCloseSocket();
 426				if (wakeLock.isHeld()) {
 427					try {
 428						wakeLock.release();
 429					} catch (final RuntimeException ignored) {
 430					}
 431				}
 432			} else {
 433				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock (is held="+wakeLock.isHeld()+") because thread was interrupted");
 434			}
 435		}
 436	}
 437
 438	/**
 439	 * Starts xmpp protocol, call after connecting to socket
 440	 * @return true if server returns with valid xmpp, false otherwise
 441     */
 442	private boolean startXmpp(Socket socket) throws Exception {
 443		if (Thread.currentThread().isInterrupted()) {
 444			throw new InterruptedException();
 445		}
 446		this.socket = socket;
 447		tagReader = new XmlReader(wakeLock);
 448		if (tagWriter != null) {
 449			tagWriter.forceClose();
 450		}
 451		tagWriter = new TagWriter();
 452		tagWriter.setOutputStream(socket.getOutputStream());
 453		tagReader.setInputStream(socket.getInputStream());
 454		tagWriter.beginDocument();
 455		sendStartStream();
 456		final Tag tag = tagReader.readTag();
 457		return tag != null && tag.isStart("stream");
 458	}
 459
 460	private static class TlsFactoryVerifier {
 461		private final SSLSocketFactory factory;
 462		private final HostnameVerifier verifier;
 463
 464		public TlsFactoryVerifier(final SSLSocketFactory factory, final HostnameVerifier verifier) throws IOException {
 465			this.factory = factory;
 466			this.verifier = verifier;
 467			if (factory == null || verifier == null) {
 468				throw new IOException("could not setup ssl");
 469			}
 470		}
 471	}
 472
 473	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 474		final SSLContext sc = SSLSocketHelper.getSSLContext();
 475		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 476		KeyManager[] keyManager;
 477		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 478			keyManager = new KeyManager[]{new MyKeyManager()};
 479		} else {
 480			keyManager = null;
 481		}
 482		String domain = account.getJid().getDomainpart();
 483		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 484		final SSLSocketFactory factory = sc.getSocketFactory();
 485		final HostnameVerifier verifier;
 486		if (mInteractive) {
 487			verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier());
 488		} else {
 489			verifier = trustManager.wrapHostnameVerifierNonInteractive(new XmppDomainVerifier());
 490		}
 491
 492		return new TlsFactoryVerifier(factory, verifier);
 493	}
 494
 495	@Override
 496	public void run() {
 497		forceCloseSocket();
 498		connect();
 499	}
 500
 501	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 502		Tag nextTag = tagReader.readTag();
 503		while (nextTag != null && !nextTag.isEnd("stream")) {
 504			if (nextTag.isStart("error")) {
 505				processStreamError(nextTag);
 506			} else if (nextTag.isStart("features")) {
 507				processStreamFeatures(nextTag);
 508			} else if (nextTag.isStart("proceed")) {
 509				switchOverToTls(nextTag);
 510			} else if (nextTag.isStart("success")) {
 511				final String challenge = tagReader.readElement(nextTag).getContent();
 512				try {
 513					saslMechanism.getResponse(challenge);
 514				} catch (final SaslMechanism.AuthenticationException e) {
 515					Log.e(Config.LOGTAG, String.valueOf(e));
 516					throw new StateChangingException(Account.State.UNAUTHORIZED);
 517				}
 518				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 519				account.setKey(Account.PINNED_MECHANISM_KEY,
 520						String.valueOf(saslMechanism.getPriority()));
 521				tagReader.reset();
 522				sendStartStream();
 523				final Tag tag = tagReader.readTag();
 524				if (tag != null && tag.isStart("stream")) {
 525					processStream();
 526				} else {
 527					throw new IOException("server didn't restart stream after successful auth");
 528				}
 529				break;
 530			} else if (nextTag.isStart("failure")) {
 531				final Element failure = tagReader.readElement(nextTag);
 532				if (Namespace.SASL.equals(failure.getNamespace())) {
 533					final String text = failure.findChildContent("text");
 534					if (failure.hasChild("account-disabled")
 535							&& text != null
 536							&& text.contains("renew")
 537							&& Config.MAGIC_CREATE_DOMAIN != null
 538							&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 539						throw new StateChangingException(Account.State.PAYMENT_REQUIRED);
 540					} else {
 541						throw new StateChangingException(Account.State.UNAUTHORIZED);
 542					}
 543				} else if (Namespace.TLS.equals(failure.getNamespace())) {
 544					throw new StateChangingException(Account.State.TLS_ERROR);
 545				} else {
 546					throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 547				}
 548			} else if (nextTag.isStart("challenge")) {
 549				final String challenge = tagReader.readElement(nextTag).getContent();
 550				final Element response = new Element("response",Namespace.SASL);
 551				try {
 552					response.setContent(saslMechanism.getResponse(challenge));
 553				} catch (final SaslMechanism.AuthenticationException e) {
 554					// TODO: Send auth abort tag.
 555					Log.e(Config.LOGTAG, e.toString());
 556				}
 557				tagWriter.writeElement(response);
 558			} else if (nextTag.isStart("enabled")) {
 559				final Element enabled = tagReader.readElement(nextTag);
 560				if ("true".equals(enabled.getAttribute("resume"))) {
 561					this.streamId = enabled.getAttribute("id");
 562					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 563							+ ": stream management(" + smVersion
 564							+ ") enabled (resumable)");
 565				} else {
 566					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 567							+ ": stream management(" + smVersion + ") enabled");
 568				}
 569				this.stanzasReceived = 0;
 570				final RequestPacket r = new RequestPacket(smVersion);
 571				tagWriter.writeStanzaAsync(r);
 572			} else if (nextTag.isStart("resumed")) {
 573				this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 574				lastPacketReceived = SystemClock.elapsedRealtime();
 575				final Element resumed = tagReader.readElement(nextTag);
 576				final String h = resumed.getAttribute("h");
 577				try {
 578					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 579					synchronized (this.mStanzaQueue) {
 580						final int serverCount = Integer.parseInt(h);
 581						if (serverCount != stanzasSent) {
 582							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 583									+ ": session resumed with lost packages");
 584							stanzasSent = serverCount;
 585						} else {
 586							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 587						}
 588						acknowledgeStanzaUpTo(serverCount);
 589						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 590							failedStanzas.add(mStanzaQueue.valueAt(i));
 591						}
 592						mStanzaQueue.clear();
 593					}
 594					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 595					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 596						if (packet instanceof MessagePacket) {
 597							MessagePacket message = (MessagePacket) packet;
 598							mXmppConnectionService.markMessage(account,
 599									message.getTo().toBareJid(),
 600									message.getId(),
 601									Message.STATUS_UNSEND);
 602						}
 603						sendPacket(packet);
 604					}
 605				} catch (final NumberFormatException ignored) {
 606				}
 607				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 608				changeStatus(Account.State.ONLINE);
 609			} else if (nextTag.isStart("r")) {
 610				tagReader.readElement(nextTag);
 611				if (Config.EXTENDED_SM_LOGGING) {
 612					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 613				}
 614				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 615				tagWriter.writeStanzaAsync(ack);
 616			} else if (nextTag.isStart("a")) {
 617				boolean accountUiNeedsRefresh = false;
 618				synchronized (NotificationService.CATCHUP_LOCK) {
 619					if (mWaitingForSmCatchup.compareAndSet(true, false)) {
 620						int count = mSmCatchupMessageCounter.get();
 621						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": SM catchup complete (" + count + ")");
 622						accountUiNeedsRefresh = true;
 623						if (count > 0) {
 624							mXmppConnectionService.getNotificationService().finishBacklog(true, account);
 625						}
 626					}
 627				}
 628				if (accountUiNeedsRefresh) {
 629					mXmppConnectionService.updateAccountUi();
 630				}
 631				final Element ack = tagReader.readElement(nextTag);
 632				lastPacketReceived = SystemClock.elapsedRealtime();
 633				try {
 634					synchronized (this.mStanzaQueue) {
 635						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 636						acknowledgeStanzaUpTo(serverSequence);
 637					}
 638				} catch (NumberFormatException | NullPointerException e) {
 639					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 640				}
 641			} else if (nextTag.isStart("failed")) {
 642				Element failed = tagReader.readElement(nextTag);
 643				try {
 644					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 645					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 646					synchronized (this.mStanzaQueue) {
 647						acknowledgeStanzaUpTo(serverCount);
 648					}
 649				} catch (NumberFormatException | NullPointerException e) {
 650					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 651				}
 652				resetStreamId();
 653				sendBindRequest();
 654			} else if (nextTag.isStart("iq")) {
 655				processIq(nextTag);
 656			} else if (nextTag.isStart("message")) {
 657				processMessage(nextTag);
 658			} else if (nextTag.isStart("presence")) {
 659				processPresence(nextTag);
 660			}
 661			nextTag = tagReader.readTag();
 662		}
 663	}
 664
 665	private void acknowledgeStanzaUpTo(int serverCount) {
 666		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 667			if (serverCount >= mStanzaQueue.keyAt(i)) {
 668				if (Config.EXTENDED_SM_LOGGING) {
 669					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 670				}
 671				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 672				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 673					MessagePacket packet = (MessagePacket) stanza;
 674					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 675				}
 676				mStanzaQueue.removeAt(i);
 677				i--;
 678			}
 679		}
 680	}
 681
 682	private Element processPacket(final Tag currentTag, final int packetType)
 683		throws XmlPullParserException, IOException {
 684		Element element;
 685		switch (packetType) {
 686			case PACKET_IQ:
 687				element = new IqPacket();
 688				break;
 689			case PACKET_MESSAGE:
 690				element = new MessagePacket();
 691				break;
 692			case PACKET_PRESENCE:
 693				element = new PresencePacket();
 694				break;
 695			default:
 696				return null;
 697		}
 698		element.setAttributes(currentTag.getAttributes());
 699		Tag nextTag = tagReader.readTag();
 700		if (nextTag == null) {
 701			throw new IOException("interrupted mid tag");
 702		}
 703		while (!nextTag.isEnd(element.getName())) {
 704			if (!nextTag.isNo()) {
 705				final Element child = tagReader.readElement(nextTag);
 706				final String type = currentTag.getAttribute("type");
 707				if (packetType == PACKET_IQ
 708						&& "jingle".equals(child.getName())
 709						&& ("set".equalsIgnoreCase(type) || "get"
 710							.equalsIgnoreCase(type))) {
 711					element = new JinglePacket();
 712					element.setAttributes(currentTag.getAttributes());
 713							}
 714				element.addChild(child);
 715			}
 716			nextTag = tagReader.readTag();
 717			if (nextTag == null) {
 718				throw new IOException("interrupted mid tag");
 719			}
 720		}
 721		if (stanzasReceived == Integer.MAX_VALUE) {
 722			resetStreamId();
 723			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 724		}
 725		++stanzasReceived;
 726		lastPacketReceived = SystemClock.elapsedRealtime();
 727		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 728			Log.d(Config.LOGTAG,"[background stanza] "+element);
 729		}
 730		return element;
 731	}
 732
 733	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 734		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 735
 736		if (packet.getId() == null) {
 737			return; // an iq packet without id is definitely invalid
 738		}
 739
 740		if (packet instanceof JinglePacket) {
 741			if (this.jingleListener != null) {
 742				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 743			}
 744		} else {
 745			OnIqPacketReceived callback = null;
 746			synchronized (this.packetCallbacks) {
 747				if (packetCallbacks.containsKey(packet.getId())) {
 748					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 749					// Packets to the server should have responses from the server
 750					if (packetCallbackDuple.first.toServer(account)) {
 751						if (packet.fromServer(account)) {
 752							callback = packetCallbackDuple.second;
 753							packetCallbacks.remove(packet.getId());
 754						} else {
 755							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 756						}
 757					} else {
 758						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 759							callback = packetCallbackDuple.second;
 760							packetCallbacks.remove(packet.getId());
 761						} else {
 762							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 763						}
 764					}
 765				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 766					callback = this.unregisteredIqListener;
 767				}
 768			}
 769			if (callback != null) {
 770				try {
 771					callback.onIqPacketReceived(account, packet);
 772				} catch (StateChangingError error) {
 773					throw new StateChangingException(error.state);
 774				}
 775			}
 776		}
 777	}
 778
 779	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 780		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 781		this.messageListener.onMessagePacketReceived(account, packet);
 782	}
 783
 784	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 785		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 786		this.presenceListener.onPresencePacketReceived(account, packet);
 787	}
 788
 789	private void sendStartTLS() throws IOException {
 790		final Tag startTLS = Tag.empty("starttls");
 791		startTLS.setAttribute("xmlns", Namespace.TLS);
 792		tagWriter.writeTag(startTLS);
 793	}
 794
 795
 796
 797	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 798		tagReader.readTag();
 799		try {
 800			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 801			final InetAddress address = socket == null ? null : socket.getInetAddress();
 802
 803			if (address == null) {
 804				throw new IOException("could not setup ssl");
 805			}
 806
 807			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 808
 809			if (sslSocket == null) {
 810				throw new IOException("could not initialize ssl socket");
 811			}
 812
 813			SSLSocketHelper.setSecurity(sslSocket);
 814
 815			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), sslSocket.getSession())) {
 816				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 817				throw new StateChangingException(Account.State.TLS_ERROR);
 818			}
 819			tagReader.setInputStream(sslSocket.getInputStream());
 820			tagWriter.setOutputStream(sslSocket.getOutputStream());
 821			sendStartStream();
 822			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 823			features.encryptionEnabled = true;
 824			final Tag tag = tagReader.readTag();
 825			if (tag != null && tag.isStart("stream")) {
 826				processStream();
 827			} else {
 828				throw new IOException("server didn't restart stream after STARTTLS");
 829			}
 830			sslSocket.close();
 831		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 832			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 833			throw new StateChangingException(Account.State.TLS_ERROR);
 834		}
 835	}
 836
 837	private void processStreamFeatures(final Tag currentTag)
 838		throws XmlPullParserException, IOException {
 839		this.streamFeatures = tagReader.readElement(currentTag);
 840		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 841			sendStartTLS();
 842		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 843			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 844				sendRegistryRequest();
 845			} else {
 846				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 847			}
 848		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 849			throw new StateChangingException(Account.State.REGISTRATION_NOT_SUPPORTED);
 850		} else if (this.streamFeatures.hasChild("mechanisms")
 851				&& shouldAuthenticate
 852				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 853			authenticate();
 854		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 855			if (Config.EXTENDED_SM_LOGGING) {
 856				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 857			}
 858			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 859			this.mSmCatchupMessageCounter.set(0);
 860			this.mWaitingForSmCatchup.set(true);
 861			this.tagWriter.writeStanzaAsync(resume);
 862		} else if (needsBinding) {
 863			if (this.streamFeatures.hasChild("bind")) {
 864				sendBindRequest();
 865			} else {
 866				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 867			}
 868		}
 869	}
 870
 871	private void authenticate() throws IOException {
 872		final List<String> mechanisms = extractMechanisms(streamFeatures
 873				.findChild("mechanisms"));
 874		final Element auth = new Element("auth",Namespace.SASL);
 875		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 876			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 877		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 878			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 879		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 880			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 881		} else if (mechanisms.contains("PLAIN")) {
 882			saslMechanism = new Plain(tagWriter, account);
 883		} else if (mechanisms.contains("DIGEST-MD5")) {
 884			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 885		} else if (mechanisms.contains("ANONYMOUS")) {
 886			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 887		}
 888		if (saslMechanism != null) {
 889			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 890			if (pinnedMechanism > saslMechanism.getPriority()) {
 891				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 892						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 893						") than pinned priority (" + pinnedMechanism +
 894						"). Possible downgrade attack?");
 895				throw new StateChangingException(Account.State.DOWNGRADE_ATTACK);
 896			}
 897			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 898			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 899			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 900				auth.setContent(saslMechanism.getClientFirstMessage());
 901			}
 902			tagWriter.writeElement(auth);
 903		} else {
 904			throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 905		}
 906	}
 907
 908	private List<String> extractMechanisms(final Element stream) {
 909		final ArrayList<String> mechanisms = new ArrayList<>(stream
 910				.getChildren().size());
 911		for (final Element child : stream.getChildren()) {
 912			mechanisms.add(child.getContent());
 913		}
 914		return mechanisms;
 915	}
 916
 917	private void sendRegistryRequest() {
 918		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 919		register.query("jabber:iq:register");
 920		register.setTo(account.getServer());
 921		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 922
 923			@Override
 924			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 925				boolean failed = false;
 926				if (packet.getType() == IqPacket.TYPE.RESULT
 927						&& packet.query().hasChild("username")
 928						&& (packet.query().hasChild("password"))) {
 929					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 930					final Element username = new Element("username").setContent(account.getUsername());
 931					final Element password = new Element("password").setContent(account.getPassword());
 932					register.query("jabber:iq:register").addChild(username);
 933					register.query().addChild(password);
 934					register.setFrom(account.getJid().toBareJid());
 935					sendUnmodifiedIqPacket(register, registrationResponseListener);
 936				} else if (packet.getType() == IqPacket.TYPE.RESULT
 937						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 938					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 939					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 940					final String id = packet.getId();
 941
 942					Bitmap captcha = null;
 943					if (blob != null) {
 944						try {
 945							final String base64Blob = blob.getContent();
 946							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 947							InputStream stream = new ByteArrayInputStream(strBlob);
 948							captcha = BitmapFactory.decodeStream(stream);
 949						} catch (Exception e) {
 950							//ignored
 951						}
 952					} else {
 953						try {
 954							Field url = data.getFieldByName("url");
 955							String urlString = url.findChildContent("value");
 956							URL uri = new URL(urlString);
 957							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 958						} catch (IOException e) {
 959							Log.e(Config.LOGTAG, e.toString());
 960						}
 961					}
 962
 963					if (captcha != null) {
 964						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 965					}
 966				} else {
 967					failed = true;
 968				}
 969
 970				if (failed) {
 971					final Element query = packet.query();
 972					final String instructions = query.findChildContent("instructions");
 973					final Element oob = query.findChild("x",Namespace.OOB);
 974					final String url = oob == null ? null : oob.findChildContent("url");
 975					if (url == null && instructions != null) {
 976						Matcher matcher = Patterns.AUTOLINK_WEB_URL.matcher(instructions);
 977						if (matcher.find()) {
 978							setAccountCreationFailed(instructions.substring(matcher.start(),matcher.end()));
 979						} else {
 980							setAccountCreationFailed(null);
 981						}
 982					} else {
 983						setAccountCreationFailed(url);
 984					}
 985				}
 986			}
 987		});
 988	}
 989
 990	private void setAccountCreationFailed(String url) {
 991		if (url != null && (url.toLowerCase().startsWith("http://") || url.toLowerCase().startsWith("https://"))) {
 992			changeStatus(Account.State.REGISTRATION_WEB);
 993			this.webRegistrationUrl = url;
 994		} else {
 995			changeStatus(Account.State.REGISTRATION_FAILED);
 996		}
 997		disconnect(true);
 998		Log.d(Config.LOGTAG, account.getJid().toBareJid()+": could not register. url="+url);
 999	}
1000
1001	public String getWebRegistrationUrl() {
1002		return this.webRegistrationUrl;
1003	}
1004
1005	public void resetEverything() {
1006		resetAttemptCount(true);
1007		resetStreamId();
1008		clearIqCallbacks();
1009		mStanzaQueue.clear();
1010		this.webRegistrationUrl = null;
1011		synchronized (this.disco) {
1012			disco.clear();
1013		}
1014	}
1015
1016	private void sendBindRequest() {
1017		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
1018			try {
1019				Thread.sleep(500);
1020			} catch (final InterruptedException ignored) {
1021			}
1022		}
1023		needsBinding = false;
1024		clearIqCallbacks();
1025		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1026		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1027				.addChild("resource").setContent(account.getResource());
1028		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1029			@Override
1030			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1031				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1032					return;
1033				}
1034				final Element bind = packet.findChild("bind");
1035				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1036					final Element jid = bind.findChild("jid");
1037					if (jid != null && jid.getContent() != null) {
1038						try {
1039							if (account.setJid(Jid.fromString(jid.getContent()))) {
1040								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1041								mXmppConnectionService.databaseBackend.updateAccount(account);
1042							}
1043							if (streamFeatures.hasChild("session")
1044									&& !streamFeatures.findChild("session").hasChild("optional")) {
1045								sendStartSession();
1046							} else {
1047								sendPostBindInitialization();
1048							}
1049							return;
1050						} catch (final InvalidJidException e) {
1051							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1052						}
1053					} else {
1054						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1055					}
1056				} else {
1057					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1058				}
1059				final Element error = packet.findChild("error");
1060				final String resource = account.getResource().split("\\.")[0];
1061				if (packet.getType() == IqPacket.TYPE.ERROR && error != null && error.hasChild("conflict")) {
1062					account.setResource(resource + "." + nextRandomId());
1063				} else {
1064					account.setResource(resource);
1065				}
1066				throw new StateChangingError(Account.State.BIND_FAILURE);
1067			}
1068		});
1069	}
1070
1071	private void clearIqCallbacks() {
1072		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1073		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1074		synchronized (this.packetCallbacks) {
1075			if (this.packetCallbacks.size() == 0) {
1076				return;
1077			}
1078			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1079			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1080			while (iterator.hasNext()) {
1081				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1082				callbacks.add(entry.second);
1083				iterator.remove();
1084			}
1085		}
1086		for(OnIqPacketReceived callback : callbacks) {
1087			callback.onIqPacketReceived(account,failurePacket);
1088		}
1089		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1090	}
1091
1092	public void sendDiscoTimeout() {
1093		if (mWaitForDisco.compareAndSet(true, false)) {
1094			finalizeBind();
1095		}
1096	}
1097
1098	private void sendStartSession() {
1099		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1100		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1101		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1102		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1103			@Override
1104			public void onIqPacketReceived(Account account, IqPacket packet) {
1105				if (packet.getType() == IqPacket.TYPE.RESULT) {
1106					sendPostBindInitialization();
1107				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1108					throw new StateChangingError(Account.State.SESSION_FAILURE);
1109				}
1110			}
1111		});
1112	}
1113
1114	private void sendPostBindInitialization() {
1115		smVersion = 0;
1116		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1117			smVersion = 3;
1118		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1119			smVersion = 2;
1120		}
1121		if (smVersion != 0) {
1122			synchronized (this.mStanzaQueue) {
1123				final EnablePacket enable = new EnablePacket(smVersion);
1124				tagWriter.writeStanzaAsync(enable);
1125				stanzasSent = 0;
1126				mStanzaQueue.clear();
1127			}
1128		}
1129		features.carbonsEnabled = false;
1130		features.blockListRequested = false;
1131		synchronized (this.disco) {
1132			this.disco.clear();
1133		}
1134		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1135		mPendingServiceDiscoveries.set(0);
1136		if (smVersion == 0 || Patches.DISCO_EXCEPTIONS.contains(account.getJid().getDomainpart())) {
1137			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": do not wait for service discovery");
1138			mWaitForDisco.set(false);
1139		} else {
1140			mWaitForDisco.set(true);
1141		}
1142		lastDiscoStarted = SystemClock.elapsedRealtime();
1143		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1144		Element caps = streamFeatures.findChild("c");
1145		final String hash = caps == null ? null : caps.getAttribute("hash");
1146		final String ver = caps == null ? null : caps.getAttribute("ver");
1147		ServiceDiscoveryResult discoveryResult = null;
1148		if (hash != null && ver != null) {
1149			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1150		}
1151		if (discoveryResult == null) {
1152			sendServiceDiscoveryInfo(account.getServer());
1153		} else {
1154			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1155			disco.put(account.getServer(), discoveryResult);
1156		}
1157		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1158		sendServiceDiscoveryItems(account.getServer());
1159
1160		if (!mWaitForDisco.get()) {
1161			finalizeBind();
1162		}
1163		this.lastSessionStarted = SystemClock.elapsedRealtime();
1164	}
1165
1166	private void sendServiceDiscoveryInfo(final Jid jid) {
1167		mPendingServiceDiscoveries.incrementAndGet();
1168		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1169		iq.setTo(jid);
1170		iq.query("http://jabber.org/protocol/disco#info");
1171		this.sendIqPacket(iq, new OnIqPacketReceived() {
1172
1173			@Override
1174			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1175				if (packet.getType() == IqPacket.TYPE.RESULT) {
1176					boolean advancedStreamFeaturesLoaded;
1177					synchronized (XmppConnection.this.disco) {
1178						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1179						if (jid.equals(account.getServer())) {
1180							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1181						}
1182						disco.put(jid, result);
1183						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1184								&& disco.containsKey(account.getJid().toBareJid());
1185					}
1186					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1187						enableAdvancedStreamFeatures();
1188					}
1189				} else {
1190					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1191				}
1192				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1193					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1194							&& mWaitForDisco.compareAndSet(true, false)) {
1195						finalizeBind();
1196					}
1197				}
1198			}
1199		});
1200	}
1201
1202	private void finalizeBind() {
1203		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1204		if (bindListener != null) {
1205			bindListener.onBind(account);
1206		}
1207		changeStatus(Account.State.ONLINE);
1208	}
1209
1210	private void enableAdvancedStreamFeatures() {
1211		if (getFeatures().carbons() && !features.carbonsEnabled) {
1212			sendEnableCarbons();
1213		}
1214		if (getFeatures().blocking() && !features.blockListRequested) {
1215			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1216			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1217		}
1218		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1219			listener.onAdvancedStreamFeaturesAvailable(account);
1220		}
1221	}
1222
1223	private void sendServiceDiscoveryItems(final Jid server) {
1224		mPendingServiceDiscoveries.incrementAndGet();
1225		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1226		iq.setTo(server.toDomainJid());
1227		iq.query("http://jabber.org/protocol/disco#items");
1228		this.sendIqPacket(iq, new OnIqPacketReceived() {
1229
1230			@Override
1231			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1232				if (packet.getType() == IqPacket.TYPE.RESULT) {
1233					final List<Element> elements = packet.query().getChildren();
1234					for (final Element element : elements) {
1235						if (element.getName().equals("item")) {
1236							final Jid jid = element.getAttributeAsJid("jid");
1237							if (jid != null && !jid.equals(account.getServer())) {
1238								sendServiceDiscoveryInfo(jid);
1239							}
1240						}
1241					}
1242				} else {
1243					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1244				}
1245				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1246					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1247							&& mWaitForDisco.compareAndSet(true, false)) {
1248						finalizeBind();
1249					}
1250				}
1251			}
1252		});
1253	}
1254
1255	private void sendEnableCarbons() {
1256		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1257		iq.addChild("enable", "urn:xmpp:carbons:2");
1258		this.sendIqPacket(iq, new OnIqPacketReceived() {
1259
1260			@Override
1261			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1262				if (!packet.hasChild("error")) {
1263					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1264							+ ": successfully enabled carbons");
1265					features.carbonsEnabled = true;
1266				} else {
1267					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1268							+ ": error enableing carbons " + packet.toString());
1269				}
1270			}
1271		});
1272	}
1273
1274	private void processStreamError(final Tag currentTag)
1275		throws XmlPullParserException, IOException {
1276		final Element streamError = tagReader.readElement(currentTag);
1277		if (streamError == null) {
1278			return;
1279		}
1280		if (streamError.hasChild("conflict")) {
1281			final String resource = account.getResource().split("\\.")[0];
1282			account.setResource(resource + "." + nextRandomId());
1283			Log.d(Config.LOGTAG,
1284					account.getJid().toBareJid() + ": switching resource due to conflict ("
1285					+ account.getResource() + ")");
1286			throw new IOException();
1287		} else if (streamError.hasChild("host-unknown")) {
1288			throw new StateChangingException(Account.State.HOST_UNKNOWN);
1289		} else if (streamError.hasChild("policy-violation")) {
1290			throw new StateChangingException(Account.State.POLICY_VIOLATION);
1291		} else {
1292			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1293			throw new StateChangingException(Account.State.STREAM_ERROR);
1294		}
1295	}
1296
1297	private void sendStartStream() throws IOException {
1298		final Tag stream = Tag.start("stream:stream");
1299		stream.setAttribute("to", account.getServer().toString());
1300		stream.setAttribute("version", "1.0");
1301		stream.setAttribute("xml:lang", "en");
1302		stream.setAttribute("xmlns", "jabber:client");
1303		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1304		tagWriter.writeTag(stream);
1305	}
1306
1307	private String nextRandomId() {
1308		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(36);
1309	}
1310
1311	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1312		packet.setFrom(account.getJid());
1313		return this.sendUnmodifiedIqPacket(packet, callback);
1314	}
1315
1316	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1317		if (packet.getId() == null) {
1318			final String id = nextRandomId();
1319			packet.setAttribute("id", id);
1320		}
1321		if (callback != null) {
1322			synchronized (this.packetCallbacks) {
1323				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1324			}
1325		}
1326		this.sendPacket(packet);
1327		return packet.getId();
1328	}
1329
1330	public void sendMessagePacket(final MessagePacket packet) {
1331		this.sendPacket(packet);
1332	}
1333
1334	public void sendPresencePacket(final PresencePacket packet) {
1335		this.sendPacket(packet);
1336	}
1337
1338	private synchronized void sendPacket(final AbstractStanza packet) {
1339		if (stanzasSent == Integer.MAX_VALUE) {
1340			resetStreamId();
1341			disconnect(true);
1342			return;
1343		}
1344		synchronized (this.mStanzaQueue) {
1345			tagWriter.writeStanzaAsync(packet);
1346			if (packet instanceof AbstractAcknowledgeableStanza) {
1347				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1348				++stanzasSent;
1349				this.mStanzaQueue.append(stanzasSent, stanza);
1350				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1351					if (Config.EXTENDED_SM_LOGGING) {
1352						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1353					}
1354					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1355				}
1356			}
1357		}
1358	}
1359
1360	public void sendPing() {
1361		if (!r()) {
1362			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1363			iq.setFrom(account.getJid());
1364			iq.addChild("ping", "urn:xmpp:ping");
1365			this.sendIqPacket(iq, null);
1366		}
1367		this.lastPingSent = SystemClock.elapsedRealtime();
1368	}
1369
1370	public void setOnMessagePacketReceivedListener(
1371			final OnMessagePacketReceived listener) {
1372		this.messageListener = listener;
1373			}
1374
1375	public void setOnUnregisteredIqPacketReceivedListener(
1376			final OnIqPacketReceived listener) {
1377		this.unregisteredIqListener = listener;
1378			}
1379
1380	public void setOnPresencePacketReceivedListener(
1381			final OnPresencePacketReceived listener) {
1382		this.presenceListener = listener;
1383			}
1384
1385	public void setOnJinglePacketReceivedListener(
1386			final OnJinglePacketReceived listener) {
1387		this.jingleListener = listener;
1388			}
1389
1390	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1391		this.statusListener = listener;
1392	}
1393
1394	public void setOnBindListener(final OnBindListener listener) {
1395		this.bindListener = listener;
1396	}
1397
1398	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1399		this.acknowledgedListener = listener;
1400	}
1401
1402	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1403		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1404			this.advancedStreamFeaturesLoadedListeners.add(listener);
1405		}
1406	}
1407
1408	private void forceCloseSocket() {
1409		if (socket != null) {
1410			try {
1411				socket.close();
1412			} catch (IOException e) {
1413				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1414			}
1415		} else {
1416			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1417		}
1418	}
1419
1420	public void interrupt() {
1421		Thread.currentThread().interrupt();
1422	}
1423
1424	public void disconnect(final boolean force) {
1425		interrupt();
1426		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1427		if (force) {
1428			forceCloseSocket();
1429		} else {
1430			if (tagWriter.isActive()) {
1431				tagWriter.finish();
1432				try {
1433					int i = 0;
1434					boolean warned = false;
1435					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1436						if (!warned) {
1437							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1438							warned = true;
1439						}
1440						try {
1441							Thread.sleep(200);
1442						} catch(InterruptedException e) {
1443							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1444						}
1445						i++;
1446					}
1447					if (warned) {
1448						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1449					}
1450					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1451					tagWriter.writeTag(Tag.end("stream:stream"));
1452				} catch (final IOException e) {
1453					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1454				} finally {
1455					forceCloseSocket();
1456				}
1457			}
1458		}
1459	}
1460
1461	public void resetStreamId() {
1462		this.streamId = null;
1463	}
1464
1465	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1466		synchronized (this.disco) {
1467			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1468			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1469				if (cursor.getValue().getFeatures().contains(feature)) {
1470					items.add(cursor);
1471				}
1472			}
1473			return items;
1474		}
1475	}
1476
1477	public Jid findDiscoItemByFeature(final String feature) {
1478		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1479		if (items.size() >= 1) {
1480			return items.get(0).getKey();
1481		}
1482		return null;
1483	}
1484
1485	public boolean r() {
1486		if (getFeatures().sm()) {
1487			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1488			return true;
1489		} else {
1490			return false;
1491		}
1492	}
1493
1494	public String getMucServer() {
1495		synchronized (this.disco) {
1496			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1497				final ServiceDiscoveryResult value = cursor.getValue();
1498				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1499						&& !value.getFeatures().contains("jabber:iq:gateway")
1500						&& !value.hasIdentity("conference", "irc")) {
1501					return cursor.getKey().toString();
1502				}
1503			}
1504		}
1505		return null;
1506	}
1507
1508	public int getTimeToNextAttempt() {
1509		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1510		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1511		return interval - secondsSinceLast;
1512	}
1513
1514	public int getAttempt() {
1515		return this.attempt;
1516	}
1517
1518	public Features getFeatures() {
1519		return this.features;
1520	}
1521
1522	public long getLastSessionEstablished() {
1523		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1524		return System.currentTimeMillis() - diff;
1525	}
1526
1527	public long getLastConnect() {
1528		return this.lastConnect;
1529	}
1530
1531	public long getLastPingSent() {
1532		return this.lastPingSent;
1533	}
1534
1535	public long getLastDiscoStarted() {
1536		return this.lastDiscoStarted;
1537	}
1538	public long getLastPacketReceived() {
1539		return this.lastPacketReceived;
1540	}
1541
1542	public void sendActive() {
1543		this.sendPacket(new ActivePacket());
1544	}
1545
1546	public void sendInactive() {
1547		this.sendPacket(new InactivePacket());
1548	}
1549
1550	public void resetAttemptCount(boolean resetConnectTime) {
1551		this.attempt = 0;
1552		if (resetConnectTime) {
1553			this.lastConnect = 0;
1554		}
1555	}
1556
1557	public void setInteractive(boolean interactive) {
1558		this.mInteractive = interactive;
1559	}
1560
1561	public Identity getServerIdentity() {
1562		synchronized (this.disco) {
1563			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1564			if (result == null) {
1565				return Identity.UNKNOWN;
1566			}
1567			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1568				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1569					switch (id.getName()) {
1570						case "Prosody":
1571							return Identity.PROSODY;
1572						case "ejabberd":
1573							return Identity.EJABBERD;
1574						case "Slack-XMPP":
1575							return Identity.SLACK;
1576					}
1577				}
1578			}
1579		}
1580		return Identity.UNKNOWN;
1581	}
1582
1583	private class StateChangingError extends Error {
1584		private final Account.State state;
1585
1586		public StateChangingError(Account.State state) {
1587			this.state = state;
1588		}
1589	}
1590
1591	private class StateChangingException extends IOException {
1592		private final Account.State state;
1593
1594		public StateChangingException(Account.State state) {
1595			this.state = state;
1596		}
1597	}
1598
1599	public enum Identity {
1600		FACEBOOK,
1601		SLACK,
1602		EJABBERD,
1603		PROSODY,
1604		NIMBUZZ,
1605		UNKNOWN
1606	}
1607
1608	public class Features {
1609		XmppConnection connection;
1610		private boolean carbonsEnabled = false;
1611		private boolean encryptionEnabled = false;
1612		private boolean blockListRequested = false;
1613
1614		public Features(final XmppConnection connection) {
1615			this.connection = connection;
1616		}
1617
1618		private boolean hasDiscoFeature(final Jid server, final String feature) {
1619			synchronized (XmppConnection.this.disco) {
1620				return connection.disco.containsKey(server) &&
1621						connection.disco.get(server).getFeatures().contains(feature);
1622			}
1623		}
1624
1625		public boolean carbons() {
1626			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1627		}
1628
1629		public boolean blocking() {
1630			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1631		}
1632
1633		public boolean spamReporting() {
1634			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1635		}
1636
1637		public boolean register() {
1638			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1639		}
1640
1641		public boolean sm() {
1642			return streamId != null
1643					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1644		}
1645
1646		public boolean csi() {
1647			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1648		}
1649
1650		public boolean pep() {
1651			synchronized (XmppConnection.this.disco) {
1652				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1653				return info != null && info.hasIdentity("pubsub", "pep");
1654			}
1655		}
1656
1657		public boolean pepPersistent() {
1658			synchronized (XmppConnection.this.disco) {
1659				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1660				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1661			}
1662		}
1663
1664		public boolean mam() {
1665			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1666					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1667		}
1668
1669		public boolean mamLegacy() {
1670			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1671					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1672		}
1673
1674		public boolean push() {
1675			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1676					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1677		}
1678
1679		public boolean rosterVersioning() {
1680			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1681		}
1682
1683		public void setBlockListRequested(boolean value) {
1684			this.blockListRequested = value;
1685		}
1686
1687		public boolean httpUpload(long filesize) {
1688			if (Config.DISABLE_HTTP_UPLOAD) {
1689				return false;
1690			} else {
1691				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1692				if (items.size() > 0) {
1693					try {
1694						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1695						if(filesize <= maxsize) {
1696							return true;
1697						} else {
1698							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1699							return false;
1700						}
1701					} catch (Exception e) {
1702						return true;
1703					}
1704				} else {
1705					return false;
1706				}
1707			}
1708		}
1709
1710		public long getMaxHttpUploadSize() {
1711			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1712				if (items.size() > 0) {
1713					try {
1714						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1715					} catch (Exception e) {
1716						return -1;
1717					}
1718				} else {
1719					return -1;
1720				}
1721		}
1722
1723		public boolean stanzaIds() {
1724			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1725		}
1726	}
1727
1728	private IqGenerator getIqGenerator() {
1729		return mXmppConnectionService.getIqGenerator();
1730	}
1731}