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.KeyManager;
  45import javax.net.ssl.SSLContext;
  46import javax.net.ssl.SSLSession;
  47import javax.net.ssl.SSLSocket;
  48import javax.net.ssl.SSLSocketFactory;
  49import javax.net.ssl.X509KeyManager;
  50import javax.net.ssl.X509TrustManager;
  51
  52import de.duenndns.ssl.DomainHostnameVerifier;
  53import de.duenndns.ssl.MemorizingTrustManager;
  54import eu.siacs.conversations.Config;
  55import eu.siacs.conversations.crypto.XmppDomainVerifier;
  56import eu.siacs.conversations.crypto.sasl.Anonymous;
  57import eu.siacs.conversations.crypto.sasl.DigestMd5;
  58import eu.siacs.conversations.crypto.sasl.External;
  59import eu.siacs.conversations.crypto.sasl.Plain;
  60import eu.siacs.conversations.crypto.sasl.SaslMechanism;
  61import eu.siacs.conversations.crypto.sasl.ScramSha1;
  62import eu.siacs.conversations.crypto.sasl.ScramSha256;
  63import eu.siacs.conversations.entities.Account;
  64import eu.siacs.conversations.entities.Message;
  65import eu.siacs.conversations.entities.ServiceDiscoveryResult;
  66import eu.siacs.conversations.generator.IqGenerator;
  67import eu.siacs.conversations.services.NotificationService;
  68import eu.siacs.conversations.services.XmppConnectionService;
  69import eu.siacs.conversations.utils.CryptoHelper;
  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				try {
 305					InetSocketAddress address = new InetSocketAddress(this.verifiedHostname, account.getPort());
 306					features.encryptionEnabled = address.getPort() == 5223;
 307					if (features.encryptionEnabled) {
 308						try {
 309							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 310							localSocket = tlsFactoryVerifier.factory.createSocket();
 311							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 312							final SSLSession session = ((SSLSocket) localSocket).getSession();
 313							final String domain = account.getJid().getDomainpart();
 314							if (!tlsFactoryVerifier.verifier.verify(domain, this.verifiedHostname, session)) {
 315								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 316								throw new StateChangingException(Account.State.TLS_ERROR);
 317							}
 318						} catch (KeyManagementException e) {
 319							throw new StateChangingException(Account.State.TLS_ERROR);
 320						}
 321					} else {
 322						localSocket = new Socket();
 323						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 324					}
 325				} catch (IOException | IllegalArgumentException e) {
 326					throw new UnknownHostException();
 327				}
 328				try {
 329					startXmpp(localSocket);
 330				} catch (InterruptedException e) {
 331					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 332					return;
 333				} catch (Exception e) {
 334					throw new IOException(e.getMessage());
 335				}
 336			} else if (IP.matches(account.getServer().toString())) {
 337				localSocket = new Socket();
 338				try {
 339					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 340				} catch (IOException e) {
 341					throw new UnknownHostException();
 342				}
 343				try {
 344					startXmpp(localSocket);
 345				} catch (InterruptedException e) {
 346					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 347					return;
 348				} catch (Exception e) {
 349					throw new IOException(e.getMessage());
 350				}
 351			} else {
 352				List<Resolver.Result> results = Resolver.resolve(account.getJid().getDomainpart());
 353				for (Iterator<Resolver.Result> iterator = results.iterator(); iterator.hasNext(); ) {
 354					final Resolver.Result result = iterator.next();
 355					if (Thread.currentThread().isInterrupted()) {
 356						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 357						return;
 358					}
 359					try {
 360						// if tls is true, encryption is implied and must not be started
 361						features.encryptionEnabled = result.isDirectTls();
 362						verifiedHostname = result.isAuthenticated() ? result.getHostname().toString() : null;
 363						final InetSocketAddress addr;
 364						if (result.getIp() != null) {
 365							addr = new InetSocketAddress(result.getIp(), result.getPort());
 366							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 367									+ ": using values from dns " + result.getHostname().toString()
 368									+ "/" + result.getIp().getHostAddress() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
 369						} else {
 370							addr = new InetSocketAddress(IDN.toASCII(result.getHostname().toString()), result.getPort());
 371							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 372									+ ": using values from dns "
 373									+ result.getHostname().toString() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
 374						}
 375
 376						if (!features.encryptionEnabled) {
 377							localSocket = new Socket();
 378							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 379						} else {
 380							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 381							localSocket = tlsFactoryVerifier.factory.createSocket();
 382
 383							if (localSocket == null) {
 384								throw new IOException("could not initialize ssl socket");
 385							}
 386
 387							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 388							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 389							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 390
 391							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 392
 393							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), verifiedHostname, ((SSLSocket) localSocket).getSession())) {
 394								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 395								if (!iterator.hasNext()) {
 396									throw new StateChangingException(Account.State.TLS_ERROR);
 397								}
 398							}
 399						}
 400						if (startXmpp(localSocket)) {
 401							break; // successfully connected to server that speaks xmpp
 402						} else {
 403							localSocket.close();
 404						}
 405					} catch (final StateChangingException e) {
 406						throw e;
 407					} catch (InterruptedException e) {
 408						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 409						return;
 410					} catch (final Throwable e) {
 411						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 412						if (!iterator.hasNext()) {
 413							throw new UnknownHostException();
 414						}
 415					}
 416				}
 417			}
 418			processStream();
 419		}  catch (final SecurityException e) {
 420			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 421		} catch(final StateChangingException e) {
 422			this.changeStatus(e.state);
 423		} catch (final UnknownHostException | ConnectException e) {
 424			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 425		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 426			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 427		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 428			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 429			this.changeStatus(Account.State.OFFLINE);
 430			this.attempt = Math.max(0, this.attempt - 1);
 431		} finally {
 432			if (!Thread.currentThread().isInterrupted()) {
 433				forceCloseSocket();
 434				if (wakeLock.isHeld()) {
 435					try {
 436						wakeLock.release();
 437					} catch (final RuntimeException ignored) {
 438					}
 439				}
 440			} else {
 441				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock (is held="+wakeLock.isHeld()+") because thread was interrupted");
 442			}
 443		}
 444	}
 445
 446	/**
 447	 * Starts xmpp protocol, call after connecting to socket
 448	 * @return true if server returns with valid xmpp, false otherwise
 449     */
 450	private boolean startXmpp(Socket socket) throws Exception {
 451		if (Thread.currentThread().isInterrupted()) {
 452			throw new InterruptedException();
 453		}
 454		this.socket = socket;
 455		tagReader = new XmlReader(wakeLock);
 456		if (tagWriter != null) {
 457			tagWriter.forceClose();
 458		}
 459		tagWriter = new TagWriter();
 460		tagWriter.setOutputStream(socket.getOutputStream());
 461		tagReader.setInputStream(socket.getInputStream());
 462		tagWriter.beginDocument();
 463		sendStartStream();
 464		final Tag tag = tagReader.readTag();
 465		return tag != null && tag.isStart("stream");
 466	}
 467
 468	private static class TlsFactoryVerifier {
 469		private final SSLSocketFactory factory;
 470		private final DomainHostnameVerifier verifier;
 471
 472		public TlsFactoryVerifier(final SSLSocketFactory factory, final DomainHostnameVerifier verifier) throws IOException {
 473			this.factory = factory;
 474			this.verifier = verifier;
 475			if (factory == null || verifier == null) {
 476				throw new IOException("could not setup ssl");
 477			}
 478		}
 479	}
 480
 481	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 482		final SSLContext sc = SSLSocketHelper.getSSLContext();
 483		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 484		KeyManager[] keyManager;
 485		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 486			keyManager = new KeyManager[]{new MyKeyManager()};
 487		} else {
 488			keyManager = null;
 489		}
 490		String domain = account.getJid().getDomainpart();
 491		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 492		final SSLSocketFactory factory = sc.getSocketFactory();
 493		final DomainHostnameVerifier verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier(), mInteractive);
 494		return new TlsFactoryVerifier(factory, verifier);
 495	}
 496
 497	@Override
 498	public void run() {
 499		synchronized (this) {
 500			if (Thread.currentThread().isInterrupted()) {
 501				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": aborting connect because thread was interrupted");
 502				return;
 503			}
 504			forceCloseSocket();
 505		}
 506		connect();
 507	}
 508
 509	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 510		Tag nextTag = tagReader.readTag();
 511		while (nextTag != null && !nextTag.isEnd("stream")) {
 512			if (nextTag.isStart("error")) {
 513				processStreamError(nextTag);
 514			} else if (nextTag.isStart("features")) {
 515				processStreamFeatures(nextTag);
 516			} else if (nextTag.isStart("proceed")) {
 517				switchOverToTls(nextTag);
 518			} else if (nextTag.isStart("success")) {
 519				final String challenge = tagReader.readElement(nextTag).getContent();
 520				try {
 521					saslMechanism.getResponse(challenge);
 522				} catch (final SaslMechanism.AuthenticationException e) {
 523					Log.e(Config.LOGTAG, String.valueOf(e));
 524					throw new StateChangingException(Account.State.UNAUTHORIZED);
 525				}
 526				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 527				account.setKey(Account.PINNED_MECHANISM_KEY,
 528						String.valueOf(saslMechanism.getPriority()));
 529				tagReader.reset();
 530				sendStartStream();
 531				final Tag tag = tagReader.readTag();
 532				if (tag != null && tag.isStart("stream")) {
 533					processStream();
 534				} else {
 535					throw new IOException("server didn't restart stream after successful auth");
 536				}
 537				break;
 538			} else if (nextTag.isStart("failure")) {
 539				final Element failure = tagReader.readElement(nextTag);
 540				if (Namespace.SASL.equals(failure.getNamespace())) {
 541					final String text = failure.findChildContent("text");
 542					if (failure.hasChild("account-disabled")
 543							&& text != null
 544							&& text.contains("renew")
 545							&& Config.MAGIC_CREATE_DOMAIN != null
 546							&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 547						throw new StateChangingException(Account.State.PAYMENT_REQUIRED);
 548					} else {
 549						throw new StateChangingException(Account.State.UNAUTHORIZED);
 550					}
 551				} else if (Namespace.TLS.equals(failure.getNamespace())) {
 552					throw new StateChangingException(Account.State.TLS_ERROR);
 553				} else {
 554					throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 555				}
 556			} else if (nextTag.isStart("challenge")) {
 557				final String challenge = tagReader.readElement(nextTag).getContent();
 558				final Element response = new Element("response",Namespace.SASL);
 559				try {
 560					response.setContent(saslMechanism.getResponse(challenge));
 561				} catch (final SaslMechanism.AuthenticationException e) {
 562					// TODO: Send auth abort tag.
 563					Log.e(Config.LOGTAG, e.toString());
 564				}
 565				tagWriter.writeElement(response);
 566			} else if (nextTag.isStart("enabled")) {
 567				final Element enabled = tagReader.readElement(nextTag);
 568				if ("true".equals(enabled.getAttribute("resume"))) {
 569					this.streamId = enabled.getAttribute("id");
 570					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 571							+ ": stream management(" + smVersion
 572							+ ") enabled (resumable)");
 573				} else {
 574					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 575							+ ": stream management(" + smVersion + ") enabled");
 576				}
 577				this.stanzasReceived = 0;
 578				final RequestPacket r = new RequestPacket(smVersion);
 579				tagWriter.writeStanzaAsync(r);
 580			} else if (nextTag.isStart("resumed")) {
 581				this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 582				lastPacketReceived = SystemClock.elapsedRealtime();
 583				final Element resumed = tagReader.readElement(nextTag);
 584				final String h = resumed.getAttribute("h");
 585				try {
 586					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 587					synchronized (this.mStanzaQueue) {
 588						final int serverCount = Integer.parseInt(h);
 589						if (serverCount != stanzasSent) {
 590							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 591									+ ": session resumed with lost packages");
 592							stanzasSent = serverCount;
 593						} else {
 594							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 595						}
 596						acknowledgeStanzaUpTo(serverCount);
 597						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 598							failedStanzas.add(mStanzaQueue.valueAt(i));
 599						}
 600						mStanzaQueue.clear();
 601					}
 602					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 603					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 604						if (packet instanceof MessagePacket) {
 605							MessagePacket message = (MessagePacket) packet;
 606							mXmppConnectionService.markMessage(account,
 607									message.getTo().toBareJid(),
 608									message.getId(),
 609									Message.STATUS_UNSEND);
 610						}
 611						sendPacket(packet);
 612					}
 613				} catch (final NumberFormatException ignored) {
 614				}
 615				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 616				changeStatus(Account.State.ONLINE);
 617			} else if (nextTag.isStart("r")) {
 618				tagReader.readElement(nextTag);
 619				if (Config.EXTENDED_SM_LOGGING) {
 620					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 621				}
 622				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 623				tagWriter.writeStanzaAsync(ack);
 624			} else if (nextTag.isStart("a")) {
 625				boolean accountUiNeedsRefresh = false;
 626				synchronized (NotificationService.CATCHUP_LOCK) {
 627					if (mWaitingForSmCatchup.compareAndSet(true, false)) {
 628						int count = mSmCatchupMessageCounter.get();
 629						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": SM catchup complete (" + count + ")");
 630						accountUiNeedsRefresh = true;
 631						if (count > 0) {
 632							mXmppConnectionService.getNotificationService().finishBacklog(true, account);
 633						}
 634					}
 635				}
 636				if (accountUiNeedsRefresh) {
 637					mXmppConnectionService.updateAccountUi();
 638				}
 639				final Element ack = tagReader.readElement(nextTag);
 640				lastPacketReceived = SystemClock.elapsedRealtime();
 641				try {
 642					synchronized (this.mStanzaQueue) {
 643						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 644						acknowledgeStanzaUpTo(serverSequence);
 645					}
 646				} catch (NumberFormatException | NullPointerException e) {
 647					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 648				}
 649			} else if (nextTag.isStart("failed")) {
 650				Element failed = tagReader.readElement(nextTag);
 651				try {
 652					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 653					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 654					synchronized (this.mStanzaQueue) {
 655						acknowledgeStanzaUpTo(serverCount);
 656					}
 657				} catch (NumberFormatException | NullPointerException e) {
 658					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 659				}
 660				resetStreamId();
 661				sendBindRequest();
 662			} else if (nextTag.isStart("iq")) {
 663				processIq(nextTag);
 664			} else if (nextTag.isStart("message")) {
 665				processMessage(nextTag);
 666			} else if (nextTag.isStart("presence")) {
 667				processPresence(nextTag);
 668			}
 669			nextTag = tagReader.readTag();
 670		}
 671	}
 672
 673	private void acknowledgeStanzaUpTo(int serverCount) {
 674		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 675			if (serverCount >= mStanzaQueue.keyAt(i)) {
 676				if (Config.EXTENDED_SM_LOGGING) {
 677					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 678				}
 679				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 680				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 681					MessagePacket packet = (MessagePacket) stanza;
 682					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 683				}
 684				mStanzaQueue.removeAt(i);
 685				i--;
 686			}
 687		}
 688	}
 689
 690	private Element processPacket(final Tag currentTag, final int packetType)
 691		throws XmlPullParserException, IOException {
 692		Element element;
 693		switch (packetType) {
 694			case PACKET_IQ:
 695				element = new IqPacket();
 696				break;
 697			case PACKET_MESSAGE:
 698				element = new MessagePacket();
 699				break;
 700			case PACKET_PRESENCE:
 701				element = new PresencePacket();
 702				break;
 703			default:
 704				return null;
 705		}
 706		element.setAttributes(currentTag.getAttributes());
 707		Tag nextTag = tagReader.readTag();
 708		if (nextTag == null) {
 709			throw new IOException("interrupted mid tag");
 710		}
 711		while (!nextTag.isEnd(element.getName())) {
 712			if (!nextTag.isNo()) {
 713				final Element child = tagReader.readElement(nextTag);
 714				final String type = currentTag.getAttribute("type");
 715				if (packetType == PACKET_IQ
 716						&& "jingle".equals(child.getName())
 717						&& ("set".equalsIgnoreCase(type) || "get"
 718							.equalsIgnoreCase(type))) {
 719					element = new JinglePacket();
 720					element.setAttributes(currentTag.getAttributes());
 721							}
 722				element.addChild(child);
 723			}
 724			nextTag = tagReader.readTag();
 725			if (nextTag == null) {
 726				throw new IOException("interrupted mid tag");
 727			}
 728		}
 729		if (stanzasReceived == Integer.MAX_VALUE) {
 730			resetStreamId();
 731			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 732		}
 733		++stanzasReceived;
 734		lastPacketReceived = SystemClock.elapsedRealtime();
 735		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 736			Log.d(Config.LOGTAG,"[background stanza] "+element);
 737		}
 738		return element;
 739	}
 740
 741	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 742		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 743
 744		if (packet.getId() == null) {
 745			return; // an iq packet without id is definitely invalid
 746		}
 747
 748		if (packet instanceof JinglePacket) {
 749			if (this.jingleListener != null) {
 750				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 751			}
 752		} else {
 753			OnIqPacketReceived callback = null;
 754			synchronized (this.packetCallbacks) {
 755				if (packetCallbacks.containsKey(packet.getId())) {
 756					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 757					// Packets to the server should have responses from the server
 758					if (packetCallbackDuple.first.toServer(account)) {
 759						if (packet.fromServer(account)) {
 760							callback = packetCallbackDuple.second;
 761							packetCallbacks.remove(packet.getId());
 762						} else {
 763							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 764						}
 765					} else {
 766						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 767							callback = packetCallbackDuple.second;
 768							packetCallbacks.remove(packet.getId());
 769						} else {
 770							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 771						}
 772					}
 773				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 774					callback = this.unregisteredIqListener;
 775				}
 776			}
 777			if (callback != null) {
 778				try {
 779					callback.onIqPacketReceived(account, packet);
 780				} catch (StateChangingError error) {
 781					throw new StateChangingException(error.state);
 782				}
 783			}
 784		}
 785	}
 786
 787	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 788		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 789		this.messageListener.onMessagePacketReceived(account, packet);
 790	}
 791
 792	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 793		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 794		this.presenceListener.onPresencePacketReceived(account, packet);
 795	}
 796
 797	private void sendStartTLS() throws IOException {
 798		final Tag startTLS = Tag.empty("starttls");
 799		startTLS.setAttribute("xmlns", Namespace.TLS);
 800		tagWriter.writeTag(startTLS);
 801	}
 802
 803
 804
 805	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 806		tagReader.readTag();
 807		try {
 808			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 809			final InetAddress address = socket == null ? null : socket.getInetAddress();
 810
 811			if (address == null) {
 812				throw new IOException("could not setup ssl");
 813			}
 814
 815			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 816
 817			if (sslSocket == null) {
 818				throw new IOException("could not initialize ssl socket");
 819			}
 820
 821			SSLSocketHelper.setSecurity(sslSocket);
 822
 823			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), this.verifiedHostname, sslSocket.getSession())) {
 824				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 825				throw new StateChangingException(Account.State.TLS_ERROR);
 826			}
 827			tagReader.setInputStream(sslSocket.getInputStream());
 828			tagWriter.setOutputStream(sslSocket.getOutputStream());
 829			sendStartStream();
 830			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 831			features.encryptionEnabled = true;
 832			final Tag tag = tagReader.readTag();
 833			if (tag != null && tag.isStart("stream")) {
 834				processStream();
 835			} else {
 836				throw new IOException("server didn't restart stream after STARTTLS");
 837			}
 838			sslSocket.close();
 839		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 840			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 841			throw new StateChangingException(Account.State.TLS_ERROR);
 842		}
 843	}
 844
 845	private void processStreamFeatures(final Tag currentTag)
 846		throws XmlPullParserException, IOException {
 847		this.streamFeatures = tagReader.readElement(currentTag);
 848		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 849			sendStartTLS();
 850		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 851			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 852				sendRegistryRequest();
 853			} else {
 854				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 855			}
 856		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 857			throw new StateChangingException(Account.State.REGISTRATION_NOT_SUPPORTED);
 858		} else if (this.streamFeatures.hasChild("mechanisms")
 859				&& shouldAuthenticate
 860				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 861			authenticate();
 862		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 863			if (Config.EXTENDED_SM_LOGGING) {
 864				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 865			}
 866			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 867			this.mSmCatchupMessageCounter.set(0);
 868			this.mWaitingForSmCatchup.set(true);
 869			this.tagWriter.writeStanzaAsync(resume);
 870		} else if (needsBinding) {
 871			if (this.streamFeatures.hasChild("bind")) {
 872				sendBindRequest();
 873			} else {
 874				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 875			}
 876		}
 877	}
 878
 879	private void authenticate() throws IOException {
 880		final List<String> mechanisms = extractMechanisms(streamFeatures
 881				.findChild("mechanisms"));
 882		final Element auth = new Element("auth",Namespace.SASL);
 883		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 884			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 885		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 886			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 887		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 888			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 889		} else if (mechanisms.contains("PLAIN")) {
 890			saslMechanism = new Plain(tagWriter, account);
 891		} else if (mechanisms.contains("DIGEST-MD5")) {
 892			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 893		} else if (mechanisms.contains("ANONYMOUS")) {
 894			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 895		}
 896		if (saslMechanism != null) {
 897			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 898			if (pinnedMechanism > saslMechanism.getPriority()) {
 899				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 900						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 901						") than pinned priority (" + pinnedMechanism +
 902						"). Possible downgrade attack?");
 903				throw new StateChangingException(Account.State.DOWNGRADE_ATTACK);
 904			}
 905			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 906			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 907			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 908				auth.setContent(saslMechanism.getClientFirstMessage());
 909			}
 910			tagWriter.writeElement(auth);
 911		} else {
 912			throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 913		}
 914	}
 915
 916	private List<String> extractMechanisms(final Element stream) {
 917		final ArrayList<String> mechanisms = new ArrayList<>(stream
 918				.getChildren().size());
 919		for (final Element child : stream.getChildren()) {
 920			mechanisms.add(child.getContent());
 921		}
 922		return mechanisms;
 923	}
 924
 925	private void sendRegistryRequest() {
 926		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 927		register.query("jabber:iq:register");
 928		register.setTo(account.getServer());
 929		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 930
 931			@Override
 932			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 933				boolean failed = false;
 934				if (packet.getType() == IqPacket.TYPE.RESULT
 935						&& packet.query().hasChild("username")
 936						&& (packet.query().hasChild("password"))) {
 937					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 938					final Element username = new Element("username").setContent(account.getUsername());
 939					final Element password = new Element("password").setContent(account.getPassword());
 940					register.query("jabber:iq:register").addChild(username);
 941					register.query().addChild(password);
 942					register.setFrom(account.getJid().toBareJid());
 943					sendUnmodifiedIqPacket(register, registrationResponseListener);
 944				} else if (packet.getType() == IqPacket.TYPE.RESULT
 945						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 946					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 947					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 948					final String id = packet.getId();
 949
 950					Bitmap captcha = null;
 951					if (blob != null) {
 952						try {
 953							final String base64Blob = blob.getContent();
 954							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 955							InputStream stream = new ByteArrayInputStream(strBlob);
 956							captcha = BitmapFactory.decodeStream(stream);
 957						} catch (Exception e) {
 958							//ignored
 959						}
 960					} else {
 961						try {
 962							Field url = data.getFieldByName("url");
 963							String urlString = url.findChildContent("value");
 964							URL uri = new URL(urlString);
 965							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 966						} catch (IOException e) {
 967							Log.e(Config.LOGTAG, e.toString());
 968						}
 969					}
 970
 971					if (captcha != null) {
 972						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 973					}
 974				} else {
 975					failed = true;
 976				}
 977
 978				if (failed) {
 979					final Element query = packet.query();
 980					final String instructions = query.findChildContent("instructions");
 981					final Element oob = query.findChild("x",Namespace.OOB);
 982					final String url = oob == null ? null : oob.findChildContent("url");
 983					if (url == null && instructions != null) {
 984						Matcher matcher = Patterns.AUTOLINK_WEB_URL.matcher(instructions);
 985						if (matcher.find()) {
 986							setAccountCreationFailed(instructions.substring(matcher.start(),matcher.end()));
 987						} else {
 988							setAccountCreationFailed(null);
 989						}
 990					} else {
 991						setAccountCreationFailed(url);
 992					}
 993				}
 994			}
 995		});
 996	}
 997
 998	private void setAccountCreationFailed(String url) {
 999		if (url != null && (url.toLowerCase().startsWith("http://") || url.toLowerCase().startsWith("https://"))) {
1000			changeStatus(Account.State.REGISTRATION_WEB);
1001			this.webRegistrationUrl = url;
1002		} else {
1003			changeStatus(Account.State.REGISTRATION_FAILED);
1004		}
1005		disconnect(true);
1006		Log.d(Config.LOGTAG, account.getJid().toBareJid()+": could not register. url="+url);
1007	}
1008
1009	public String getWebRegistrationUrl() {
1010		return this.webRegistrationUrl;
1011	}
1012
1013	public void resetEverything() {
1014		resetAttemptCount(true);
1015		resetStreamId();
1016		clearIqCallbacks();
1017		mStanzaQueue.clear();
1018		this.webRegistrationUrl = null;
1019		synchronized (this.disco) {
1020			disco.clear();
1021		}
1022	}
1023
1024	private void sendBindRequest() {
1025		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
1026			try {
1027				Thread.sleep(500);
1028			} catch (final InterruptedException ignored) {
1029			}
1030		}
1031		needsBinding = false;
1032		clearIqCallbacks();
1033		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1034		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1035				.addChild("resource").setContent(account.getResource());
1036		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1037			@Override
1038			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1039				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1040					return;
1041				}
1042				final Element bind = packet.findChild("bind");
1043				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1044					final Element jid = bind.findChild("jid");
1045					if (jid != null && jid.getContent() != null) {
1046						try {
1047							if (account.setJid(Jid.fromString(jid.getContent()))) {
1048								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1049								mXmppConnectionService.databaseBackend.updateAccount(account);
1050							}
1051							if (streamFeatures.hasChild("session")
1052									&& !streamFeatures.findChild("session").hasChild("optional")) {
1053								sendStartSession();
1054							} else {
1055								sendPostBindInitialization();
1056							}
1057							return;
1058						} catch (final InvalidJidException e) {
1059							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1060						}
1061					} else {
1062						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1063					}
1064				} else {
1065					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1066				}
1067				final Element error = packet.findChild("error");
1068				final String resource = account.getResource().split("\\.")[0];
1069				if (packet.getType() == IqPacket.TYPE.ERROR && error != null && error.hasChild("conflict")) {
1070					account.setResource(resource + "." + nextRandomId());
1071				} else {
1072					account.setResource(resource);
1073				}
1074				throw new StateChangingError(Account.State.BIND_FAILURE);
1075			}
1076		});
1077	}
1078
1079	private void clearIqCallbacks() {
1080		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1081		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1082		synchronized (this.packetCallbacks) {
1083			if (this.packetCallbacks.size() == 0) {
1084				return;
1085			}
1086			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1087			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1088			while (iterator.hasNext()) {
1089				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1090				callbacks.add(entry.second);
1091				iterator.remove();
1092			}
1093		}
1094		for(OnIqPacketReceived callback : callbacks) {
1095			try {
1096				callback.onIqPacketReceived(account, failurePacket);
1097			} catch (StateChangingError error) {
1098				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": caught StateChangingError("+error.state.toString()+") while clearing callbacks");
1099				//ignore
1100			}
1101		}
1102		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1103	}
1104
1105	public void sendDiscoTimeout() {
1106		if (mWaitForDisco.compareAndSet(true, false)) {
1107			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": finalizing bind after disco timeout");
1108			finalizeBind();
1109		}
1110	}
1111
1112	private void sendStartSession() {
1113		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1114		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1115		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1116		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1117			@Override
1118			public void onIqPacketReceived(Account account, IqPacket packet) {
1119				if (packet.getType() == IqPacket.TYPE.RESULT) {
1120					sendPostBindInitialization();
1121				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1122					throw new StateChangingError(Account.State.SESSION_FAILURE);
1123				}
1124			}
1125		});
1126	}
1127
1128	private void sendPostBindInitialization() {
1129		smVersion = 0;
1130		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1131			smVersion = 3;
1132		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1133			smVersion = 2;
1134		}
1135		if (smVersion != 0) {
1136			synchronized (this.mStanzaQueue) {
1137				final EnablePacket enable = new EnablePacket(smVersion);
1138				tagWriter.writeStanzaAsync(enable);
1139				stanzasSent = 0;
1140				mStanzaQueue.clear();
1141			}
1142		}
1143		features.carbonsEnabled = false;
1144		features.blockListRequested = false;
1145		synchronized (this.disco) {
1146			this.disco.clear();
1147		}
1148		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1149		mPendingServiceDiscoveries.set(0);
1150		if (smVersion == 0 || Patches.DISCO_EXCEPTIONS.contains(account.getJid().getDomainpart())) {
1151			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": do not wait for service discovery");
1152			mWaitForDisco.set(false);
1153		} else {
1154			mWaitForDisco.set(true);
1155		}
1156		lastDiscoStarted = SystemClock.elapsedRealtime();
1157		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1158		Element caps = streamFeatures.findChild("c");
1159		final String hash = caps == null ? null : caps.getAttribute("hash");
1160		final String ver = caps == null ? null : caps.getAttribute("ver");
1161		ServiceDiscoveryResult discoveryResult = null;
1162		if (hash != null && ver != null) {
1163			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1164		}
1165		if (discoveryResult == null) {
1166			sendServiceDiscoveryInfo(account.getServer());
1167		} else {
1168			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1169			disco.put(account.getServer(), discoveryResult);
1170		}
1171		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1172		sendServiceDiscoveryItems(account.getServer());
1173
1174		if (!mWaitForDisco.get()) {
1175			finalizeBind();
1176		}
1177		this.lastSessionStarted = SystemClock.elapsedRealtime();
1178	}
1179
1180	private void sendServiceDiscoveryInfo(final Jid jid) {
1181		mPendingServiceDiscoveries.incrementAndGet();
1182		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1183		iq.setTo(jid);
1184		iq.query("http://jabber.org/protocol/disco#info");
1185		this.sendIqPacket(iq, new OnIqPacketReceived() {
1186
1187			@Override
1188			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1189				if (packet.getType() == IqPacket.TYPE.RESULT) {
1190					boolean advancedStreamFeaturesLoaded;
1191					synchronized (XmppConnection.this.disco) {
1192						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1193						if (jid.equals(account.getServer())) {
1194							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1195						}
1196						disco.put(jid, result);
1197						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1198								&& disco.containsKey(account.getJid().toBareJid());
1199					}
1200					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1201						enableAdvancedStreamFeatures();
1202					}
1203				} else {
1204					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1205				}
1206				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1207					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1208							&& mWaitForDisco.compareAndSet(true, false)) {
1209						finalizeBind();
1210					}
1211				}
1212			}
1213		});
1214	}
1215
1216	private void finalizeBind() {
1217		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1218		if (bindListener != null) {
1219			bindListener.onBind(account);
1220		}
1221		changeStatus(Account.State.ONLINE);
1222	}
1223
1224	private void enableAdvancedStreamFeatures() {
1225		if (getFeatures().carbons() && !features.carbonsEnabled) {
1226			sendEnableCarbons();
1227		}
1228		if (getFeatures().blocking() && !features.blockListRequested) {
1229			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1230			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1231		}
1232		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1233			listener.onAdvancedStreamFeaturesAvailable(account);
1234		}
1235	}
1236
1237	private void sendServiceDiscoveryItems(final Jid server) {
1238		mPendingServiceDiscoveries.incrementAndGet();
1239		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1240		iq.setTo(server.toDomainJid());
1241		iq.query("http://jabber.org/protocol/disco#items");
1242		this.sendIqPacket(iq, new OnIqPacketReceived() {
1243
1244			@Override
1245			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1246				if (packet.getType() == IqPacket.TYPE.RESULT) {
1247					HashSet<Jid> items = new HashSet<Jid>();
1248					final List<Element> elements = packet.query().getChildren();
1249					for (final Element element : elements) {
1250						if (element.getName().equals("item")) {
1251							final Jid jid = element.getAttributeAsJid("jid");
1252							if (jid != null && !jid.equals(account.getServer())) {
1253								items.add(jid);
1254							}
1255						}
1256					}
1257					for(Jid jid : items) {
1258						sendServiceDiscoveryInfo(jid);
1259					}
1260				} else {
1261					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1262				}
1263				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1264					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1265							&& mWaitForDisco.compareAndSet(true, false)) {
1266						finalizeBind();
1267					}
1268				}
1269			}
1270		});
1271	}
1272
1273	private void sendEnableCarbons() {
1274		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1275		iq.addChild("enable", "urn:xmpp:carbons:2");
1276		this.sendIqPacket(iq, new OnIqPacketReceived() {
1277
1278			@Override
1279			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1280				if (!packet.hasChild("error")) {
1281					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1282							+ ": successfully enabled carbons");
1283					features.carbonsEnabled = true;
1284				} else {
1285					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1286							+ ": error enableing carbons " + packet.toString());
1287				}
1288			}
1289		});
1290	}
1291
1292	private void processStreamError(final Tag currentTag)
1293		throws XmlPullParserException, IOException {
1294		final Element streamError = tagReader.readElement(currentTag);
1295		if (streamError == null) {
1296			return;
1297		}
1298		if (streamError.hasChild("conflict")) {
1299			final String resource = account.getResource().split("\\.")[0];
1300			account.setResource(resource + "." + nextRandomId());
1301			Log.d(Config.LOGTAG,
1302					account.getJid().toBareJid() + ": switching resource due to conflict ("
1303					+ account.getResource() + ")");
1304			throw new IOException();
1305		} else if (streamError.hasChild("host-unknown")) {
1306			throw new StateChangingException(Account.State.HOST_UNKNOWN);
1307		} else if (streamError.hasChild("policy-violation")) {
1308			throw new StateChangingException(Account.State.POLICY_VIOLATION);
1309		} else {
1310			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1311			throw new StateChangingException(Account.State.STREAM_ERROR);
1312		}
1313	}
1314
1315	private void sendStartStream() throws IOException {
1316		final Tag stream = Tag.start("stream:stream");
1317		stream.setAttribute("to", account.getServer().toString());
1318		stream.setAttribute("version", "1.0");
1319		stream.setAttribute("xml:lang", "en");
1320		stream.setAttribute("xmlns", "jabber:client");
1321		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1322		tagWriter.writeTag(stream);
1323	}
1324
1325	private String nextRandomId() {
1326		return CryptoHelper.random(50,mXmppConnectionService.getRNG());
1327	}
1328
1329	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1330		packet.setFrom(account.getJid());
1331		return this.sendUnmodifiedIqPacket(packet, callback);
1332	}
1333
1334	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1335		if (packet.getId() == null) {
1336			packet.setAttribute("id", nextRandomId());
1337		}
1338		if (callback != null) {
1339			synchronized (this.packetCallbacks) {
1340				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1341			}
1342		}
1343		this.sendPacket(packet);
1344		return packet.getId();
1345	}
1346
1347	public void sendMessagePacket(final MessagePacket packet) {
1348		this.sendPacket(packet);
1349	}
1350
1351	public void sendPresencePacket(final PresencePacket packet) {
1352		this.sendPacket(packet);
1353	}
1354
1355	private synchronized void sendPacket(final AbstractStanza packet) {
1356		if (stanzasSent == Integer.MAX_VALUE) {
1357			resetStreamId();
1358			disconnect(true);
1359			return;
1360		}
1361		synchronized (this.mStanzaQueue) {
1362			tagWriter.writeStanzaAsync(packet);
1363			if (packet instanceof AbstractAcknowledgeableStanza) {
1364				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1365				++stanzasSent;
1366				this.mStanzaQueue.append(stanzasSent, stanza);
1367				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1368					if (Config.EXTENDED_SM_LOGGING) {
1369						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1370					}
1371					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1372				}
1373			}
1374		}
1375	}
1376
1377	public void sendPing() {
1378		if (!r()) {
1379			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1380			iq.setFrom(account.getJid());
1381			iq.addChild("ping", "urn:xmpp:ping");
1382			this.sendIqPacket(iq, null);
1383		}
1384		this.lastPingSent = SystemClock.elapsedRealtime();
1385	}
1386
1387	public void setOnMessagePacketReceivedListener(
1388			final OnMessagePacketReceived listener) {
1389		this.messageListener = listener;
1390			}
1391
1392	public void setOnUnregisteredIqPacketReceivedListener(
1393			final OnIqPacketReceived listener) {
1394		this.unregisteredIqListener = listener;
1395			}
1396
1397	public void setOnPresencePacketReceivedListener(
1398			final OnPresencePacketReceived listener) {
1399		this.presenceListener = listener;
1400			}
1401
1402	public void setOnJinglePacketReceivedListener(
1403			final OnJinglePacketReceived listener) {
1404		this.jingleListener = listener;
1405			}
1406
1407	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1408		this.statusListener = listener;
1409	}
1410
1411	public void setOnBindListener(final OnBindListener listener) {
1412		this.bindListener = listener;
1413	}
1414
1415	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1416		this.acknowledgedListener = listener;
1417	}
1418
1419	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1420		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1421			this.advancedStreamFeaturesLoadedListeners.add(listener);
1422		}
1423	}
1424
1425	private void forceCloseSocket() {
1426		if (socket != null) {
1427			try {
1428				socket.close();
1429			} catch (IOException e) {
1430				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1431			}
1432		} else {
1433			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1434		}
1435	}
1436
1437	public void interrupt() {
1438		Thread.currentThread().interrupt();
1439	}
1440
1441	public void disconnect(final boolean force) {
1442		interrupt();
1443		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1444		if (force) {
1445			forceCloseSocket();
1446		} else {
1447			if (tagWriter.isActive()) {
1448				tagWriter.finish();
1449				try {
1450					int i = 0;
1451					boolean warned = false;
1452					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1453						if (!warned) {
1454							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1455							warned = true;
1456						}
1457						try {
1458							Thread.sleep(200);
1459						} catch(InterruptedException e) {
1460							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1461						}
1462						i++;
1463					}
1464					if (warned) {
1465						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1466					}
1467					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1468					tagWriter.writeTag(Tag.end("stream:stream"));
1469				} catch (final IOException e) {
1470					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1471				} finally {
1472					forceCloseSocket();
1473				}
1474			}
1475		}
1476	}
1477
1478	public void resetStreamId() {
1479		this.streamId = null;
1480	}
1481
1482	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1483		synchronized (this.disco) {
1484			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1485			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1486				if (cursor.getValue().getFeatures().contains(feature)) {
1487					items.add(cursor);
1488				}
1489			}
1490			return items;
1491		}
1492	}
1493
1494	public Jid findDiscoItemByFeature(final String feature) {
1495		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1496		if (items.size() >= 1) {
1497			return items.get(0).getKey();
1498		}
1499		return null;
1500	}
1501
1502	public boolean r() {
1503		if (getFeatures().sm()) {
1504			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1505			return true;
1506		} else {
1507			return false;
1508		}
1509	}
1510
1511	public String getMucServer() {
1512		synchronized (this.disco) {
1513			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1514				final ServiceDiscoveryResult value = cursor.getValue();
1515				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1516						&& !value.getFeatures().contains("jabber:iq:gateway")
1517						&& !value.hasIdentity("conference", "irc")) {
1518					return cursor.getKey().toString();
1519				}
1520			}
1521		}
1522		return null;
1523	}
1524
1525	public int getTimeToNextAttempt() {
1526		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1527		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1528		return interval - secondsSinceLast;
1529	}
1530
1531	public int getAttempt() {
1532		return this.attempt;
1533	}
1534
1535	public Features getFeatures() {
1536		return this.features;
1537	}
1538
1539	public long getLastSessionEstablished() {
1540		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1541		return System.currentTimeMillis() - diff;
1542	}
1543
1544	public long getLastConnect() {
1545		return this.lastConnect;
1546	}
1547
1548	public long getLastPingSent() {
1549		return this.lastPingSent;
1550	}
1551
1552	public long getLastDiscoStarted() {
1553		return this.lastDiscoStarted;
1554	}
1555	public long getLastPacketReceived() {
1556		return this.lastPacketReceived;
1557	}
1558
1559	public void sendActive() {
1560		this.sendPacket(new ActivePacket());
1561	}
1562
1563	public void sendInactive() {
1564		this.sendPacket(new InactivePacket());
1565	}
1566
1567	public void resetAttemptCount(boolean resetConnectTime) {
1568		this.attempt = 0;
1569		if (resetConnectTime) {
1570			this.lastConnect = 0;
1571		}
1572	}
1573
1574	public void setInteractive(boolean interactive) {
1575		this.mInteractive = interactive;
1576	}
1577
1578	public Identity getServerIdentity() {
1579		synchronized (this.disco) {
1580			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1581			if (result == null) {
1582				return Identity.UNKNOWN;
1583			}
1584			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1585				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1586					switch (id.getName()) {
1587						case "Prosody":
1588							return Identity.PROSODY;
1589						case "ejabberd":
1590							return Identity.EJABBERD;
1591						case "Slack-XMPP":
1592							return Identity.SLACK;
1593					}
1594				}
1595			}
1596		}
1597		return Identity.UNKNOWN;
1598	}
1599
1600	private class StateChangingError extends Error {
1601		private final Account.State state;
1602
1603		public StateChangingError(Account.State state) {
1604			this.state = state;
1605		}
1606	}
1607
1608	private class StateChangingException extends IOException {
1609		private final Account.State state;
1610
1611		public StateChangingException(Account.State state) {
1612			this.state = state;
1613		}
1614	}
1615
1616	public enum Identity {
1617		FACEBOOK,
1618		SLACK,
1619		EJABBERD,
1620		PROSODY,
1621		NIMBUZZ,
1622		UNKNOWN
1623	}
1624
1625	public class Features {
1626		XmppConnection connection;
1627		private boolean carbonsEnabled = false;
1628		private boolean encryptionEnabled = false;
1629		private boolean blockListRequested = false;
1630
1631		public Features(final XmppConnection connection) {
1632			this.connection = connection;
1633		}
1634
1635		private boolean hasDiscoFeature(final Jid server, final String feature) {
1636			synchronized (XmppConnection.this.disco) {
1637				return connection.disco.containsKey(server) &&
1638						connection.disco.get(server).getFeatures().contains(feature);
1639			}
1640		}
1641
1642		public boolean carbons() {
1643			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1644		}
1645
1646		public boolean blocking() {
1647			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1648		}
1649
1650		public boolean spamReporting() {
1651			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1652		}
1653
1654		public boolean register() {
1655			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1656		}
1657
1658		public boolean sm() {
1659			return streamId != null
1660					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1661		}
1662
1663		public boolean csi() {
1664			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1665		}
1666
1667		public boolean pep() {
1668			synchronized (XmppConnection.this.disco) {
1669				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1670				return info != null && info.hasIdentity("pubsub", "pep");
1671			}
1672		}
1673
1674		public boolean pepPersistent() {
1675			synchronized (XmppConnection.this.disco) {
1676				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1677				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1678			}
1679		}
1680
1681		public boolean pepPublishOptions() {
1682			synchronized (XmppConnection.this.disco) {
1683				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1684				return info != null && info.getFeatures().contains(Namespace.PUBSUB_PUBLISH_OPTIONS);
1685			}
1686		}
1687
1688		public boolean mam() {
1689			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1690					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1691		}
1692
1693		public boolean mamLegacy() {
1694			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1695					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1696		}
1697
1698		public boolean push() {
1699			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1700					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1701		}
1702
1703		public boolean rosterVersioning() {
1704			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1705		}
1706
1707		public void setBlockListRequested(boolean value) {
1708			this.blockListRequested = value;
1709		}
1710
1711		public boolean httpUpload(long filesize) {
1712			if (Config.DISABLE_HTTP_UPLOAD) {
1713				return false;
1714			} else {
1715				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1716				if (items.size() > 0) {
1717					try {
1718						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1719						if(filesize <= maxsize) {
1720							return true;
1721						} else {
1722							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1723							return false;
1724						}
1725					} catch (Exception e) {
1726						return true;
1727					}
1728				} else {
1729					return false;
1730				}
1731			}
1732		}
1733
1734		public long getMaxHttpUploadSize() {
1735			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1736				if (items.size() > 0) {
1737					try {
1738						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1739					} catch (Exception e) {
1740						return -1;
1741					}
1742				} else {
1743					return -1;
1744				}
1745		}
1746
1747		public boolean stanzaIds() {
1748			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1749		}
1750	}
1751
1752	private IqGenerator getIqGenerator() {
1753		return mXmppConnectionService.getIqGenerator();
1754	}
1755}