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.IP;
  70import eu.siacs.conversations.utils.Patterns;
  71import eu.siacs.conversations.utils.Resolver;
  72import eu.siacs.conversations.utils.SSLSocketHelper;
  73import eu.siacs.conversations.utils.SocksSocketFactory;
  74import eu.siacs.conversations.xml.Element;
  75import eu.siacs.conversations.xml.Tag;
  76import eu.siacs.conversations.xml.TagWriter;
  77import eu.siacs.conversations.xml.XmlReader;
  78import eu.siacs.conversations.xml.Namespace;
  79import eu.siacs.conversations.xmpp.forms.Data;
  80import eu.siacs.conversations.xmpp.forms.Field;
  81import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  82import eu.siacs.conversations.xmpp.jid.Jid;
  83import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
  84import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
  85import eu.siacs.conversations.xmpp.stanzas.AbstractAcknowledgeableStanza;
  86import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
  87import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  88import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  89import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
  90import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
  91import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
  92import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
  93import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
  94import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
  95import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
  96
  97public class XmppConnection implements Runnable {
  98
  99	private static final int PACKET_IQ = 0;
 100	private static final int PACKET_MESSAGE = 1;
 101	private static final int PACKET_PRESENCE = 2;
 102	protected final Account account;
 103	private final WakeLock wakeLock;
 104	private Socket socket;
 105	private XmlReader tagReader;
 106	private TagWriter tagWriter = new TagWriter();
 107	private final Features features = new Features(this);
 108	private boolean needsBinding = true;
 109	private boolean shouldAuthenticate = true;
 110	private Element streamFeatures;
 111	private final HashMap<Jid, ServiceDiscoveryResult> disco = new HashMap<>();
 112
 113	private String streamId = null;
 114	private int smVersion = 3;
 115	private final SparseArray<AbstractAcknowledgeableStanza> mStanzaQueue = new SparseArray<>();
 116
 117	private int stanzasReceived = 0;
 118	private int stanzasSent = 0;
 119	private long lastPacketReceived = 0;
 120	private long lastPingSent = 0;
 121	private long lastConnect = 0;
 122	private long lastSessionStarted = 0;
 123	private long lastDiscoStarted = 0;
 124	private AtomicInteger mPendingServiceDiscoveries = new AtomicInteger(0);
 125	private AtomicBoolean mWaitForDisco = new AtomicBoolean(true);
 126	private AtomicBoolean mWaitingForSmCatchup = new AtomicBoolean(false);
 127	private AtomicInteger mSmCatchupMessageCounter = new AtomicInteger(0);
 128	private boolean mInteractive = false;
 129	private int attempt = 0;
 130	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 131	private OnPresencePacketReceived presenceListener = null;
 132	private OnJinglePacketReceived jingleListener = null;
 133	private OnIqPacketReceived unregisteredIqListener = null;
 134	private OnMessagePacketReceived messageListener = null;
 135	private OnStatusChanged statusListener = null;
 136	private OnBindListener bindListener = null;
 137	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 138	private OnMessageAcknowledged acknowledgedListener = null;
 139	private final XmppConnectionService mXmppConnectionService;
 140
 141	private SaslMechanism saslMechanism;
 142	private String webRegistrationUrl = null;
 143	private String verifiedHostname = null;
 144
 145	private class MyKeyManager implements X509KeyManager {
 146		@Override
 147		public String chooseClientAlias(String[] strings, Principal[] principals, Socket socket) {
 148			return account.getPrivateKeyAlias();
 149		}
 150
 151		@Override
 152		public String chooseServerAlias(String s, Principal[] principals, Socket socket) {
 153			return null;
 154		}
 155
 156		@Override
 157		public X509Certificate[] getCertificateChain(String alias) {
 158			Log.d(Config.LOGTAG,"getting certificate chain");
 159			try {
 160				return KeyChain.getCertificateChain(mXmppConnectionService, alias);
 161			} catch (Exception e) {
 162				Log.d(Config.LOGTAG,e.getMessage());
 163				return new X509Certificate[0];
 164			}
 165		}
 166
 167		@Override
 168		public String[] getClientAliases(String s, Principal[] principals) {
 169			final String alias = account.getPrivateKeyAlias();
 170			return alias != null ? new String[]{alias} : new String[0];
 171		}
 172
 173		@Override
 174		public String[] getServerAliases(String s, Principal[] principals) {
 175			return new String[0];
 176		}
 177
 178		@Override
 179		public PrivateKey getPrivateKey(String alias) {
 180			try {
 181				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 182			} catch (Exception e) {
 183				return null;
 184			}
 185		}
 186	}
 187
 188	public final OnIqPacketReceived registrationResponseListener =  new OnIqPacketReceived() {
 189		@Override
 190		public void onIqPacketReceived(Account account, IqPacket packet) {
 191			if (packet.getType() == IqPacket.TYPE.RESULT) {
 192				account.setOption(Account.OPTION_REGISTER, false);
 193				forceCloseSocket();
 194				changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 195			} else {
 196				final List<String> PASSWORD_TOO_WEAK_MSGS = Arrays.asList(
 197						"The password is too weak",
 198						"Please use a longer password.");
 199				Element error = packet.findChild("error");
 200				Account.State state = Account.State.REGISTRATION_FAILED;
 201				if (error != null) {
 202					if (error.hasChild("conflict")) {
 203						state = Account.State.REGISTRATION_CONFLICT;
 204					} else if (error.hasChild("resource-constraint")
 205							&& "wait".equals(error.getAttribute("type"))) {
 206						state = Account.State.REGISTRATION_PLEASE_WAIT;
 207					} else if (error.hasChild("not-acceptable")
 208							&& PASSWORD_TOO_WEAK_MSGS.contains(error.findChildContent("text"))) {
 209						state = Account.State.REGISTRATION_PASSWORD_TOO_WEAK;
 210					}
 211				}
 212				changeStatus(state);
 213				forceCloseSocket();
 214			}
 215		}
 216	};
 217
 218	public XmppConnection(final Account account, final XmppConnectionService service) {
 219		this.account = account;
 220		this.wakeLock = service.getPowerManager().newWakeLock(
 221				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 222		mXmppConnectionService = service;
 223	}
 224
 225	protected void changeStatus(final Account.State nextStatus) {
 226		synchronized (this) {
 227			if (Thread.currentThread().isInterrupted()) {
 228				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": not changing status to " + nextStatus + " because thread was interrupted");
 229				return;
 230			}
 231			if (account.getStatus() != nextStatus) {
 232				if ((nextStatus == Account.State.OFFLINE)
 233						&& (account.getStatus() != Account.State.CONNECTING)
 234						&& (account.getStatus() != Account.State.ONLINE)
 235						&& (account.getStatus() != Account.State.DISABLED)) {
 236					return;
 237				}
 238				if (nextStatus == Account.State.ONLINE) {
 239					this.attempt = 0;
 240				}
 241				account.setStatus(nextStatus);
 242			} else {
 243				return;
 244			}
 245		}
 246		if (statusListener != null) {
 247			statusListener.onStatusChanged(account);
 248		}
 249	}
 250
 251	public void prepareNewConnection() {
 252		this.lastConnect = SystemClock.elapsedRealtime();
 253		this.lastPingSent = SystemClock.elapsedRealtime();
 254		this.lastDiscoStarted = Long.MAX_VALUE;
 255		this.mWaitingForSmCatchup.set(false);
 256		this.changeStatus(Account.State.CONNECTING);
 257	}
 258
 259	public boolean isWaitingForSmCatchup() {
 260		return mWaitingForSmCatchup.get();
 261	}
 262
 263	public void incrementSmCatchupMessageCounter() {
 264		this.mSmCatchupMessageCounter.incrementAndGet();
 265	}
 266
 267	protected void connect() {
 268		if (mXmppConnectionService.areMessagesInitialized()) {
 269			mXmppConnectionService.resetSendingToWaiting(account);
 270		}
 271		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 272		features.encryptionEnabled = false;
 273		this.attempt++;
 274		this.verifiedHostname = null; //will be set if user entered hostname is being used or hostname was verified with dnssec
 275		try {
 276			Socket localSocket;
 277			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 278			this.changeStatus(Account.State.CONNECTING);
 279			final boolean useTor = mXmppConnectionService.useTorToConnect() || account.isOnion();
 280			final boolean extended = mXmppConnectionService.showExtendedConnectionOptions();
 281			if (useTor) {
 282				String destination;
 283				if (account.getHostname().isEmpty()) {
 284					destination = account.getServer().toString();
 285				} else {
 286					destination = account.getHostname();
 287					this.verifiedHostname = destination;
 288				}
 289				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": connect to " + destination + " via Tor");
 290				localSocket = SocksSocketFactory.createSocketOverTor(destination, account.getPort());
 291				try {
 292					startXmpp(localSocket);
 293				} catch (InterruptedException e) {
 294					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 295					return;
 296				} catch (Exception e) {
 297					throw new IOException(e.getMessage());
 298				}
 299			} else if (extended && !account.getHostname().isEmpty()) {
 300
 301				this.verifiedHostname = account.getHostname();
 302
 303				InetSocketAddress address = new InetSocketAddress(this.verifiedHostname, account.getPort());
 304
 305				features.encryptionEnabled = account.getPort() == 5223;
 306
 307				try {
 308					if (features.encryptionEnabled) {
 309						try {
 310							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 311							localSocket = tlsFactoryVerifier.factory.createSocket();
 312							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 313							final SSLSession session = ((SSLSocket) localSocket).getSession();
 314							final String domain = account.getJid().getDomainpart();
 315							if (!tlsFactoryVerifier.verifier.verify(domain, this.verifiedHostname, session)) {
 316								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 317								throw new StateChangingException(Account.State.TLS_ERROR);
 318							}
 319						} catch (KeyManagementException e) {
 320							features.encryptionEnabled = false;
 321							localSocket = new Socket();
 322						}
 323					} else {
 324						localSocket = new Socket();
 325						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 326					}
 327				} catch (IOException e) {
 328					throw new UnknownHostException();
 329				}
 330				try {
 331					startXmpp(localSocket);
 332				} catch (InterruptedException e) {
 333					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 334					return;
 335				} catch (Exception e) {
 336					throw new IOException(e.getMessage());
 337				}
 338			} else if (IP.matches(account.getServer().toString())) {
 339				localSocket = new Socket();
 340				try {
 341					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 342				} catch (IOException e) {
 343					throw new UnknownHostException();
 344				}
 345				try {
 346					startXmpp(localSocket);
 347				} catch (InterruptedException e) {
 348					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 349					return;
 350				} catch (Exception e) {
 351					throw new IOException(e.getMessage());
 352				}
 353			} else {
 354				List<Resolver.Result> results = Resolver.resolve(account.getJid().getDomainpart());
 355				for (Iterator<Resolver.Result> iterator = results.iterator(); iterator.hasNext(); ) {
 356					final Resolver.Result result = iterator.next();
 357					if (Thread.currentThread().isInterrupted()) {
 358						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 359						return;
 360					}
 361					try {
 362						// if tls is true, encryption is implied and must not be started
 363						features.encryptionEnabled = result.isDirectTls();
 364						verifiedHostname = result.isAuthenticated() ? result.getHostname().toString() : null;
 365						final InetSocketAddress addr;
 366						if (result.getIp() != null) {
 367							addr = new InetSocketAddress(result.getIp(), result.getPort());
 368							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 369									+ ": using values from dns " + result.getHostname().toString()
 370									+ "/" + result.getIp().getHostAddress() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
 371						} else {
 372							addr = new InetSocketAddress(IDN.toASCII(result.getHostname().toString()), result.getPort());
 373							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 374									+ ": using values from dns "
 375									+ result.getHostname().toString() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
 376						}
 377
 378						if (!features.encryptionEnabled) {
 379							localSocket = new Socket();
 380							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 381						} else {
 382							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 383							localSocket = tlsFactoryVerifier.factory.createSocket();
 384
 385							if (localSocket == null) {
 386								throw new IOException("could not initialize ssl socket");
 387							}
 388
 389							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 390							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 391							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 392
 393							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 394
 395							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), verifiedHostname, ((SSLSocket) localSocket).getSession())) {
 396								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 397								if (!iterator.hasNext()) {
 398									throw new StateChangingException(Account.State.TLS_ERROR);
 399								}
 400							}
 401						}
 402						if (startXmpp(localSocket)) {
 403							break; // successfully connected to server that speaks xmpp
 404						} else {
 405							localSocket.close();
 406						}
 407					} catch (final StateChangingException e) {
 408						throw e;
 409					} catch (InterruptedException e) {
 410						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 411						return;
 412					} catch (final Throwable e) {
 413						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 414						if (!iterator.hasNext()) {
 415							throw new UnknownHostException();
 416						}
 417					}
 418				}
 419			}
 420			processStream();
 421		}  catch (final SecurityException e) {
 422			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 423		} catch(final StateChangingException e) {
 424			this.changeStatus(e.state);
 425		} catch (final UnknownHostException | ConnectException e) {
 426			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 427		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 428			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 429		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 430			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 431			this.changeStatus(Account.State.OFFLINE);
 432			this.attempt = Math.max(0, this.attempt - 1);
 433		} finally {
 434			if (!Thread.currentThread().isInterrupted()) {
 435				forceCloseSocket();
 436				if (wakeLock.isHeld()) {
 437					try {
 438						wakeLock.release();
 439					} catch (final RuntimeException ignored) {
 440					}
 441				}
 442			} else {
 443				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock (is held="+wakeLock.isHeld()+") because thread was interrupted");
 444			}
 445		}
 446	}
 447
 448	/**
 449	 * Starts xmpp protocol, call after connecting to socket
 450	 * @return true if server returns with valid xmpp, false otherwise
 451     */
 452	private boolean startXmpp(Socket socket) throws Exception {
 453		if (Thread.currentThread().isInterrupted()) {
 454			throw new InterruptedException();
 455		}
 456		this.socket = socket;
 457		tagReader = new XmlReader(wakeLock);
 458		if (tagWriter != null) {
 459			tagWriter.forceClose();
 460		}
 461		tagWriter = new TagWriter();
 462		tagWriter.setOutputStream(socket.getOutputStream());
 463		tagReader.setInputStream(socket.getInputStream());
 464		tagWriter.beginDocument();
 465		sendStartStream();
 466		final Tag tag = tagReader.readTag();
 467		return tag != null && tag.isStart("stream");
 468	}
 469
 470	private static class TlsFactoryVerifier {
 471		private final SSLSocketFactory factory;
 472		private final DomainHostnameVerifier verifier;
 473
 474		public TlsFactoryVerifier(final SSLSocketFactory factory, final DomainHostnameVerifier verifier) throws IOException {
 475			this.factory = factory;
 476			this.verifier = verifier;
 477			if (factory == null || verifier == null) {
 478				throw new IOException("could not setup ssl");
 479			}
 480		}
 481	}
 482
 483	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 484		final SSLContext sc = SSLSocketHelper.getSSLContext();
 485		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 486		KeyManager[] keyManager;
 487		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 488			keyManager = new KeyManager[]{new MyKeyManager()};
 489		} else {
 490			keyManager = null;
 491		}
 492		String domain = account.getJid().getDomainpart();
 493		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 494		final SSLSocketFactory factory = sc.getSocketFactory();
 495		final DomainHostnameVerifier verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier(), mInteractive);
 496		return new TlsFactoryVerifier(factory, verifier);
 497	}
 498
 499	@Override
 500	public void run() {
 501		forceCloseSocket();
 502		connect();
 503	}
 504
 505	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 506		Tag nextTag = tagReader.readTag();
 507		while (nextTag != null && !nextTag.isEnd("stream")) {
 508			if (nextTag.isStart("error")) {
 509				processStreamError(nextTag);
 510			} else if (nextTag.isStart("features")) {
 511				processStreamFeatures(nextTag);
 512			} else if (nextTag.isStart("proceed")) {
 513				switchOverToTls(nextTag);
 514			} else if (nextTag.isStart("success")) {
 515				final String challenge = tagReader.readElement(nextTag).getContent();
 516				try {
 517					saslMechanism.getResponse(challenge);
 518				} catch (final SaslMechanism.AuthenticationException e) {
 519					Log.e(Config.LOGTAG, String.valueOf(e));
 520					throw new StateChangingException(Account.State.UNAUTHORIZED);
 521				}
 522				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 523				account.setKey(Account.PINNED_MECHANISM_KEY,
 524						String.valueOf(saslMechanism.getPriority()));
 525				tagReader.reset();
 526				sendStartStream();
 527				final Tag tag = tagReader.readTag();
 528				if (tag != null && tag.isStart("stream")) {
 529					processStream();
 530				} else {
 531					throw new IOException("server didn't restart stream after successful auth");
 532				}
 533				break;
 534			} else if (nextTag.isStart("failure")) {
 535				final Element failure = tagReader.readElement(nextTag);
 536				if (Namespace.SASL.equals(failure.getNamespace())) {
 537					final String text = failure.findChildContent("text");
 538					if (failure.hasChild("account-disabled")
 539							&& text != null
 540							&& text.contains("renew")
 541							&& Config.MAGIC_CREATE_DOMAIN != null
 542							&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 543						throw new StateChangingException(Account.State.PAYMENT_REQUIRED);
 544					} else {
 545						throw new StateChangingException(Account.State.UNAUTHORIZED);
 546					}
 547				} else if (Namespace.TLS.equals(failure.getNamespace())) {
 548					throw new StateChangingException(Account.State.TLS_ERROR);
 549				} else {
 550					throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 551				}
 552			} else if (nextTag.isStart("challenge")) {
 553				final String challenge = tagReader.readElement(nextTag).getContent();
 554				final Element response = new Element("response",Namespace.SASL);
 555				try {
 556					response.setContent(saslMechanism.getResponse(challenge));
 557				} catch (final SaslMechanism.AuthenticationException e) {
 558					// TODO: Send auth abort tag.
 559					Log.e(Config.LOGTAG, e.toString());
 560				}
 561				tagWriter.writeElement(response);
 562			} else if (nextTag.isStart("enabled")) {
 563				final Element enabled = tagReader.readElement(nextTag);
 564				if ("true".equals(enabled.getAttribute("resume"))) {
 565					this.streamId = enabled.getAttribute("id");
 566					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 567							+ ": stream management(" + smVersion
 568							+ ") enabled (resumable)");
 569				} else {
 570					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 571							+ ": stream management(" + smVersion + ") enabled");
 572				}
 573				this.stanzasReceived = 0;
 574				final RequestPacket r = new RequestPacket(smVersion);
 575				tagWriter.writeStanzaAsync(r);
 576			} else if (nextTag.isStart("resumed")) {
 577				this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
 578				lastPacketReceived = SystemClock.elapsedRealtime();
 579				final Element resumed = tagReader.readElement(nextTag);
 580				final String h = resumed.getAttribute("h");
 581				try {
 582					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 583					synchronized (this.mStanzaQueue) {
 584						final int serverCount = Integer.parseInt(h);
 585						if (serverCount != stanzasSent) {
 586							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 587									+ ": session resumed with lost packages");
 588							stanzasSent = serverCount;
 589						} else {
 590							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 591						}
 592						acknowledgeStanzaUpTo(serverCount);
 593						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 594							failedStanzas.add(mStanzaQueue.valueAt(i));
 595						}
 596						mStanzaQueue.clear();
 597					}
 598					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 599					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 600						if (packet instanceof MessagePacket) {
 601							MessagePacket message = (MessagePacket) packet;
 602							mXmppConnectionService.markMessage(account,
 603									message.getTo().toBareJid(),
 604									message.getId(),
 605									Message.STATUS_UNSEND);
 606						}
 607						sendPacket(packet);
 608					}
 609				} catch (final NumberFormatException ignored) {
 610				}
 611				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 612				changeStatus(Account.State.ONLINE);
 613			} else if (nextTag.isStart("r")) {
 614				tagReader.readElement(nextTag);
 615				if (Config.EXTENDED_SM_LOGGING) {
 616					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 617				}
 618				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 619				tagWriter.writeStanzaAsync(ack);
 620			} else if (nextTag.isStart("a")) {
 621				boolean accountUiNeedsRefresh = false;
 622				synchronized (NotificationService.CATCHUP_LOCK) {
 623					if (mWaitingForSmCatchup.compareAndSet(true, false)) {
 624						int count = mSmCatchupMessageCounter.get();
 625						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": SM catchup complete (" + count + ")");
 626						accountUiNeedsRefresh = true;
 627						if (count > 0) {
 628							mXmppConnectionService.getNotificationService().finishBacklog(true, account);
 629						}
 630					}
 631				}
 632				if (accountUiNeedsRefresh) {
 633					mXmppConnectionService.updateAccountUi();
 634				}
 635				final Element ack = tagReader.readElement(nextTag);
 636				lastPacketReceived = SystemClock.elapsedRealtime();
 637				try {
 638					synchronized (this.mStanzaQueue) {
 639						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 640						acknowledgeStanzaUpTo(serverSequence);
 641					}
 642				} catch (NumberFormatException | NullPointerException e) {
 643					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 644				}
 645			} else if (nextTag.isStart("failed")) {
 646				Element failed = tagReader.readElement(nextTag);
 647				try {
 648					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 649					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 650					synchronized (this.mStanzaQueue) {
 651						acknowledgeStanzaUpTo(serverCount);
 652					}
 653				} catch (NumberFormatException | NullPointerException e) {
 654					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 655				}
 656				resetStreamId();
 657				sendBindRequest();
 658			} else if (nextTag.isStart("iq")) {
 659				processIq(nextTag);
 660			} else if (nextTag.isStart("message")) {
 661				processMessage(nextTag);
 662			} else if (nextTag.isStart("presence")) {
 663				processPresence(nextTag);
 664			}
 665			nextTag = tagReader.readTag();
 666		}
 667	}
 668
 669	private void acknowledgeStanzaUpTo(int serverCount) {
 670		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 671			if (serverCount >= mStanzaQueue.keyAt(i)) {
 672				if (Config.EXTENDED_SM_LOGGING) {
 673					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 674				}
 675				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 676				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 677					MessagePacket packet = (MessagePacket) stanza;
 678					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 679				}
 680				mStanzaQueue.removeAt(i);
 681				i--;
 682			}
 683		}
 684	}
 685
 686	private Element processPacket(final Tag currentTag, final int packetType)
 687		throws XmlPullParserException, IOException {
 688		Element element;
 689		switch (packetType) {
 690			case PACKET_IQ:
 691				element = new IqPacket();
 692				break;
 693			case PACKET_MESSAGE:
 694				element = new MessagePacket();
 695				break;
 696			case PACKET_PRESENCE:
 697				element = new PresencePacket();
 698				break;
 699			default:
 700				return null;
 701		}
 702		element.setAttributes(currentTag.getAttributes());
 703		Tag nextTag = tagReader.readTag();
 704		if (nextTag == null) {
 705			throw new IOException("interrupted mid tag");
 706		}
 707		while (!nextTag.isEnd(element.getName())) {
 708			if (!nextTag.isNo()) {
 709				final Element child = tagReader.readElement(nextTag);
 710				final String type = currentTag.getAttribute("type");
 711				if (packetType == PACKET_IQ
 712						&& "jingle".equals(child.getName())
 713						&& ("set".equalsIgnoreCase(type) || "get"
 714							.equalsIgnoreCase(type))) {
 715					element = new JinglePacket();
 716					element.setAttributes(currentTag.getAttributes());
 717							}
 718				element.addChild(child);
 719			}
 720			nextTag = tagReader.readTag();
 721			if (nextTag == null) {
 722				throw new IOException("interrupted mid tag");
 723			}
 724		}
 725		if (stanzasReceived == Integer.MAX_VALUE) {
 726			resetStreamId();
 727			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 728		}
 729		++stanzasReceived;
 730		lastPacketReceived = SystemClock.elapsedRealtime();
 731		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 732			Log.d(Config.LOGTAG,"[background stanza] "+element);
 733		}
 734		return element;
 735	}
 736
 737	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 738		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 739
 740		if (packet.getId() == null) {
 741			return; // an iq packet without id is definitely invalid
 742		}
 743
 744		if (packet instanceof JinglePacket) {
 745			if (this.jingleListener != null) {
 746				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 747			}
 748		} else {
 749			OnIqPacketReceived callback = null;
 750			synchronized (this.packetCallbacks) {
 751				if (packetCallbacks.containsKey(packet.getId())) {
 752					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 753					// Packets to the server should have responses from the server
 754					if (packetCallbackDuple.first.toServer(account)) {
 755						if (packet.fromServer(account)) {
 756							callback = packetCallbackDuple.second;
 757							packetCallbacks.remove(packet.getId());
 758						} else {
 759							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 760						}
 761					} else {
 762						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 763							callback = packetCallbackDuple.second;
 764							packetCallbacks.remove(packet.getId());
 765						} else {
 766							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 767						}
 768					}
 769				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 770					callback = this.unregisteredIqListener;
 771				}
 772			}
 773			if (callback != null) {
 774				try {
 775					callback.onIqPacketReceived(account, packet);
 776				} catch (StateChangingError error) {
 777					throw new StateChangingException(error.state);
 778				}
 779			}
 780		}
 781	}
 782
 783	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 784		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 785		this.messageListener.onMessagePacketReceived(account, packet);
 786	}
 787
 788	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 789		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 790		this.presenceListener.onPresencePacketReceived(account, packet);
 791	}
 792
 793	private void sendStartTLS() throws IOException {
 794		final Tag startTLS = Tag.empty("starttls");
 795		startTLS.setAttribute("xmlns", Namespace.TLS);
 796		tagWriter.writeTag(startTLS);
 797	}
 798
 799
 800
 801	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 802		tagReader.readTag();
 803		try {
 804			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 805			final InetAddress address = socket == null ? null : socket.getInetAddress();
 806
 807			if (address == null) {
 808				throw new IOException("could not setup ssl");
 809			}
 810
 811			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 812
 813			if (sslSocket == null) {
 814				throw new IOException("could not initialize ssl socket");
 815			}
 816
 817			SSLSocketHelper.setSecurity(sslSocket);
 818
 819			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), this.verifiedHostname, sslSocket.getSession())) {
 820				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 821				throw new StateChangingException(Account.State.TLS_ERROR);
 822			}
 823			tagReader.setInputStream(sslSocket.getInputStream());
 824			tagWriter.setOutputStream(sslSocket.getOutputStream());
 825			sendStartStream();
 826			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 827			features.encryptionEnabled = true;
 828			final Tag tag = tagReader.readTag();
 829			if (tag != null && tag.isStart("stream")) {
 830				processStream();
 831			} else {
 832				throw new IOException("server didn't restart stream after STARTTLS");
 833			}
 834			sslSocket.close();
 835		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 836			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 837			throw new StateChangingException(Account.State.TLS_ERROR);
 838		}
 839	}
 840
 841	private void processStreamFeatures(final Tag currentTag)
 842		throws XmlPullParserException, IOException {
 843		this.streamFeatures = tagReader.readElement(currentTag);
 844		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 845			sendStartTLS();
 846		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 847			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 848				sendRegistryRequest();
 849			} else {
 850				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 851			}
 852		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 853			throw new StateChangingException(Account.State.REGISTRATION_NOT_SUPPORTED);
 854		} else if (this.streamFeatures.hasChild("mechanisms")
 855				&& shouldAuthenticate
 856				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 857			authenticate();
 858		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 859			if (Config.EXTENDED_SM_LOGGING) {
 860				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 861			}
 862			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 863			this.mSmCatchupMessageCounter.set(0);
 864			this.mWaitingForSmCatchup.set(true);
 865			this.tagWriter.writeStanzaAsync(resume);
 866		} else if (needsBinding) {
 867			if (this.streamFeatures.hasChild("bind")) {
 868				sendBindRequest();
 869			} else {
 870				throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 871			}
 872		}
 873	}
 874
 875	private void authenticate() throws IOException {
 876		final List<String> mechanisms = extractMechanisms(streamFeatures
 877				.findChild("mechanisms"));
 878		final Element auth = new Element("auth",Namespace.SASL);
 879		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 880			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 881		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 882			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 883		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 884			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 885		} else if (mechanisms.contains("PLAIN")) {
 886			saslMechanism = new Plain(tagWriter, account);
 887		} else if (mechanisms.contains("DIGEST-MD5")) {
 888			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 889		} else if (mechanisms.contains("ANONYMOUS")) {
 890			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 891		}
 892		if (saslMechanism != null) {
 893			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 894			if (pinnedMechanism > saslMechanism.getPriority()) {
 895				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 896						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 897						") than pinned priority (" + pinnedMechanism +
 898						"). Possible downgrade attack?");
 899				throw new StateChangingException(Account.State.DOWNGRADE_ATTACK);
 900			}
 901			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 902			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 903			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 904				auth.setContent(saslMechanism.getClientFirstMessage());
 905			}
 906			tagWriter.writeElement(auth);
 907		} else {
 908			throw new StateChangingException(Account.State.INCOMPATIBLE_SERVER);
 909		}
 910	}
 911
 912	private List<String> extractMechanisms(final Element stream) {
 913		final ArrayList<String> mechanisms = new ArrayList<>(stream
 914				.getChildren().size());
 915		for (final Element child : stream.getChildren()) {
 916			mechanisms.add(child.getContent());
 917		}
 918		return mechanisms;
 919	}
 920
 921	private void sendRegistryRequest() {
 922		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 923		register.query("jabber:iq:register");
 924		register.setTo(account.getServer());
 925		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 926
 927			@Override
 928			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 929				boolean failed = false;
 930				if (packet.getType() == IqPacket.TYPE.RESULT
 931						&& packet.query().hasChild("username")
 932						&& (packet.query().hasChild("password"))) {
 933					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 934					final Element username = new Element("username").setContent(account.getUsername());
 935					final Element password = new Element("password").setContent(account.getPassword());
 936					register.query("jabber:iq:register").addChild(username);
 937					register.query().addChild(password);
 938					register.setFrom(account.getJid().toBareJid());
 939					sendUnmodifiedIqPacket(register, registrationResponseListener);
 940				} else if (packet.getType() == IqPacket.TYPE.RESULT
 941						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 942					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 943					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 944					final String id = packet.getId();
 945
 946					Bitmap captcha = null;
 947					if (blob != null) {
 948						try {
 949							final String base64Blob = blob.getContent();
 950							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 951							InputStream stream = new ByteArrayInputStream(strBlob);
 952							captcha = BitmapFactory.decodeStream(stream);
 953						} catch (Exception e) {
 954							//ignored
 955						}
 956					} else {
 957						try {
 958							Field url = data.getFieldByName("url");
 959							String urlString = url.findChildContent("value");
 960							URL uri = new URL(urlString);
 961							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 962						} catch (IOException e) {
 963							Log.e(Config.LOGTAG, e.toString());
 964						}
 965					}
 966
 967					if (captcha != null) {
 968						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 969					}
 970				} else {
 971					failed = true;
 972				}
 973
 974				if (failed) {
 975					final Element query = packet.query();
 976					final String instructions = query.findChildContent("instructions");
 977					final Element oob = query.findChild("x",Namespace.OOB);
 978					final String url = oob == null ? null : oob.findChildContent("url");
 979					if (url == null && instructions != null) {
 980						Matcher matcher = Patterns.AUTOLINK_WEB_URL.matcher(instructions);
 981						if (matcher.find()) {
 982							setAccountCreationFailed(instructions.substring(matcher.start(),matcher.end()));
 983						} else {
 984							setAccountCreationFailed(null);
 985						}
 986					} else {
 987						setAccountCreationFailed(url);
 988					}
 989				}
 990			}
 991		});
 992	}
 993
 994	private void setAccountCreationFailed(String url) {
 995		if (url != null && (url.toLowerCase().startsWith("http://") || url.toLowerCase().startsWith("https://"))) {
 996			changeStatus(Account.State.REGISTRATION_WEB);
 997			this.webRegistrationUrl = url;
 998		} else {
 999			changeStatus(Account.State.REGISTRATION_FAILED);
1000		}
1001		disconnect(true);
1002		Log.d(Config.LOGTAG, account.getJid().toBareJid()+": could not register. url="+url);
1003	}
1004
1005	public String getWebRegistrationUrl() {
1006		return this.webRegistrationUrl;
1007	}
1008
1009	public void resetEverything() {
1010		resetAttemptCount(true);
1011		resetStreamId();
1012		clearIqCallbacks();
1013		mStanzaQueue.clear();
1014		this.webRegistrationUrl = null;
1015		synchronized (this.disco) {
1016			disco.clear();
1017		}
1018	}
1019
1020	private void sendBindRequest() {
1021		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
1022			try {
1023				Thread.sleep(500);
1024			} catch (final InterruptedException ignored) {
1025			}
1026		}
1027		needsBinding = false;
1028		clearIqCallbacks();
1029		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1030		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
1031				.addChild("resource").setContent(account.getResource());
1032		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
1033			@Override
1034			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1035				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1036					return;
1037				}
1038				final Element bind = packet.findChild("bind");
1039				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
1040					final Element jid = bind.findChild("jid");
1041					if (jid != null && jid.getContent() != null) {
1042						try {
1043							if (account.setJid(Jid.fromString(jid.getContent()))) {
1044								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1045								mXmppConnectionService.databaseBackend.updateAccount(account);
1046							}
1047							if (streamFeatures.hasChild("session")
1048									&& !streamFeatures.findChild("session").hasChild("optional")) {
1049								sendStartSession();
1050							} else {
1051								sendPostBindInitialization();
1052							}
1053							return;
1054						} catch (final InvalidJidException e) {
1055							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1056						}
1057					} else {
1058						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1059					}
1060				} else {
1061					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1062				}
1063				final Element error = packet.findChild("error");
1064				final String resource = account.getResource().split("\\.")[0];
1065				if (packet.getType() == IqPacket.TYPE.ERROR && error != null && error.hasChild("conflict")) {
1066					account.setResource(resource + "." + nextRandomId());
1067				} else {
1068					account.setResource(resource);
1069				}
1070				throw new StateChangingError(Account.State.BIND_FAILURE);
1071			}
1072		});
1073	}
1074
1075	private void clearIqCallbacks() {
1076		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1077		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1078		synchronized (this.packetCallbacks) {
1079			if (this.packetCallbacks.size() == 0) {
1080				return;
1081			}
1082			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1083			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1084			while (iterator.hasNext()) {
1085				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1086				callbacks.add(entry.second);
1087				iterator.remove();
1088			}
1089		}
1090		for(OnIqPacketReceived callback : callbacks) {
1091			try {
1092				callback.onIqPacketReceived(account, failurePacket);
1093			} catch (StateChangingError error) {
1094				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": caught StateChangingError("+error.state.toString()+") while clearing callbacks");
1095				//ignore
1096			}
1097		}
1098		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1099	}
1100
1101	public void sendDiscoTimeout() {
1102		if (mWaitForDisco.compareAndSet(true, false)) {
1103			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": finalizing bind after disco timeout");
1104			finalizeBind();
1105		}
1106	}
1107
1108	private void sendStartSession() {
1109		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1110		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1111		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1112		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1113			@Override
1114			public void onIqPacketReceived(Account account, IqPacket packet) {
1115				if (packet.getType() == IqPacket.TYPE.RESULT) {
1116					sendPostBindInitialization();
1117				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1118					throw new StateChangingError(Account.State.SESSION_FAILURE);
1119				}
1120			}
1121		});
1122	}
1123
1124	private void sendPostBindInitialization() {
1125		smVersion = 0;
1126		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1127			smVersion = 3;
1128		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1129			smVersion = 2;
1130		}
1131		if (smVersion != 0) {
1132			synchronized (this.mStanzaQueue) {
1133				final EnablePacket enable = new EnablePacket(smVersion);
1134				tagWriter.writeStanzaAsync(enable);
1135				stanzasSent = 0;
1136				mStanzaQueue.clear();
1137			}
1138		}
1139		features.carbonsEnabled = false;
1140		features.blockListRequested = false;
1141		synchronized (this.disco) {
1142			this.disco.clear();
1143		}
1144		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1145		mPendingServiceDiscoveries.set(0);
1146		if (smVersion == 0 || Patches.DISCO_EXCEPTIONS.contains(account.getJid().getDomainpart())) {
1147			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": do not wait for service discovery");
1148			mWaitForDisco.set(false);
1149		} else {
1150			mWaitForDisco.set(true);
1151		}
1152		lastDiscoStarted = SystemClock.elapsedRealtime();
1153		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1154		Element caps = streamFeatures.findChild("c");
1155		final String hash = caps == null ? null : caps.getAttribute("hash");
1156		final String ver = caps == null ? null : caps.getAttribute("ver");
1157		ServiceDiscoveryResult discoveryResult = null;
1158		if (hash != null && ver != null) {
1159			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1160		}
1161		if (discoveryResult == null) {
1162			sendServiceDiscoveryInfo(account.getServer());
1163		} else {
1164			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1165			disco.put(account.getServer(), discoveryResult);
1166		}
1167		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1168		sendServiceDiscoveryItems(account.getServer());
1169
1170		if (!mWaitForDisco.get()) {
1171			finalizeBind();
1172		}
1173		this.lastSessionStarted = SystemClock.elapsedRealtime();
1174	}
1175
1176	private void sendServiceDiscoveryInfo(final Jid jid) {
1177		mPendingServiceDiscoveries.incrementAndGet();
1178		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1179		iq.setTo(jid);
1180		iq.query("http://jabber.org/protocol/disco#info");
1181		this.sendIqPacket(iq, new OnIqPacketReceived() {
1182
1183			@Override
1184			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1185				if (packet.getType() == IqPacket.TYPE.RESULT) {
1186					boolean advancedStreamFeaturesLoaded;
1187					synchronized (XmppConnection.this.disco) {
1188						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1189						if (jid.equals(account.getServer())) {
1190							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1191						}
1192						disco.put(jid, result);
1193						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1194								&& disco.containsKey(account.getJid().toBareJid());
1195					}
1196					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1197						enableAdvancedStreamFeatures();
1198					}
1199				} else {
1200					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1201				}
1202				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1203					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1204							&& mWaitForDisco.compareAndSet(true, false)) {
1205						finalizeBind();
1206					}
1207				}
1208			}
1209		});
1210	}
1211
1212	private void finalizeBind() {
1213		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1214		if (bindListener != null) {
1215			bindListener.onBind(account);
1216		}
1217		changeStatus(Account.State.ONLINE);
1218	}
1219
1220	private void enableAdvancedStreamFeatures() {
1221		if (getFeatures().carbons() && !features.carbonsEnabled) {
1222			sendEnableCarbons();
1223		}
1224		if (getFeatures().blocking() && !features.blockListRequested) {
1225			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1226			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1227		}
1228		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1229			listener.onAdvancedStreamFeaturesAvailable(account);
1230		}
1231	}
1232
1233	private void sendServiceDiscoveryItems(final Jid server) {
1234		mPendingServiceDiscoveries.incrementAndGet();
1235		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1236		iq.setTo(server.toDomainJid());
1237		iq.query("http://jabber.org/protocol/disco#items");
1238		this.sendIqPacket(iq, new OnIqPacketReceived() {
1239
1240			@Override
1241			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1242				if (packet.getType() == IqPacket.TYPE.RESULT) {
1243					HashSet<Jid> items = new HashSet<Jid>();
1244					final List<Element> elements = packet.query().getChildren();
1245					for (final Element element : elements) {
1246						if (element.getName().equals("item")) {
1247							final Jid jid = element.getAttributeAsJid("jid");
1248							if (jid != null && !jid.equals(account.getServer())) {
1249								items.add(jid);
1250							}
1251						}
1252					}
1253					for(Jid jid : items) {
1254						sendServiceDiscoveryInfo(jid);
1255					}
1256				} else {
1257					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1258				}
1259				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1260					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1261							&& mWaitForDisco.compareAndSet(true, false)) {
1262						finalizeBind();
1263					}
1264				}
1265			}
1266		});
1267	}
1268
1269	private void sendEnableCarbons() {
1270		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1271		iq.addChild("enable", "urn:xmpp:carbons:2");
1272		this.sendIqPacket(iq, new OnIqPacketReceived() {
1273
1274			@Override
1275			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1276				if (!packet.hasChild("error")) {
1277					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1278							+ ": successfully enabled carbons");
1279					features.carbonsEnabled = true;
1280				} else {
1281					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1282							+ ": error enableing carbons " + packet.toString());
1283				}
1284			}
1285		});
1286	}
1287
1288	private void processStreamError(final Tag currentTag)
1289		throws XmlPullParserException, IOException {
1290		final Element streamError = tagReader.readElement(currentTag);
1291		if (streamError == null) {
1292			return;
1293		}
1294		if (streamError.hasChild("conflict")) {
1295			final String resource = account.getResource().split("\\.")[0];
1296			account.setResource(resource + "." + nextRandomId());
1297			Log.d(Config.LOGTAG,
1298					account.getJid().toBareJid() + ": switching resource due to conflict ("
1299					+ account.getResource() + ")");
1300			throw new IOException();
1301		} else if (streamError.hasChild("host-unknown")) {
1302			throw new StateChangingException(Account.State.HOST_UNKNOWN);
1303		} else if (streamError.hasChild("policy-violation")) {
1304			throw new StateChangingException(Account.State.POLICY_VIOLATION);
1305		} else {
1306			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1307			throw new StateChangingException(Account.State.STREAM_ERROR);
1308		}
1309	}
1310
1311	private void sendStartStream() throws IOException {
1312		final Tag stream = Tag.start("stream:stream");
1313		stream.setAttribute("to", account.getServer().toString());
1314		stream.setAttribute("version", "1.0");
1315		stream.setAttribute("xml:lang", "en");
1316		stream.setAttribute("xmlns", "jabber:client");
1317		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1318		tagWriter.writeTag(stream);
1319	}
1320
1321	private String nextRandomId() {
1322		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(36);
1323	}
1324
1325	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1326		packet.setFrom(account.getJid());
1327		return this.sendUnmodifiedIqPacket(packet, callback);
1328	}
1329
1330	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1331		if (packet.getId() == null) {
1332			packet.setAttribute("id", nextRandomId());
1333		}
1334		if (callback != null) {
1335			synchronized (this.packetCallbacks) {
1336				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1337			}
1338		}
1339		this.sendPacket(packet);
1340		return packet.getId();
1341	}
1342
1343	public void sendMessagePacket(final MessagePacket packet) {
1344		this.sendPacket(packet);
1345	}
1346
1347	public void sendPresencePacket(final PresencePacket packet) {
1348		this.sendPacket(packet);
1349	}
1350
1351	private synchronized void sendPacket(final AbstractStanza packet) {
1352		if (stanzasSent == Integer.MAX_VALUE) {
1353			resetStreamId();
1354			disconnect(true);
1355			return;
1356		}
1357		synchronized (this.mStanzaQueue) {
1358			tagWriter.writeStanzaAsync(packet);
1359			if (packet instanceof AbstractAcknowledgeableStanza) {
1360				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1361				++stanzasSent;
1362				this.mStanzaQueue.append(stanzasSent, stanza);
1363				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1364					if (Config.EXTENDED_SM_LOGGING) {
1365						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1366					}
1367					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1368				}
1369			}
1370		}
1371	}
1372
1373	public void sendPing() {
1374		if (!r()) {
1375			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1376			iq.setFrom(account.getJid());
1377			iq.addChild("ping", "urn:xmpp:ping");
1378			this.sendIqPacket(iq, null);
1379		}
1380		this.lastPingSent = SystemClock.elapsedRealtime();
1381	}
1382
1383	public void setOnMessagePacketReceivedListener(
1384			final OnMessagePacketReceived listener) {
1385		this.messageListener = listener;
1386			}
1387
1388	public void setOnUnregisteredIqPacketReceivedListener(
1389			final OnIqPacketReceived listener) {
1390		this.unregisteredIqListener = listener;
1391			}
1392
1393	public void setOnPresencePacketReceivedListener(
1394			final OnPresencePacketReceived listener) {
1395		this.presenceListener = listener;
1396			}
1397
1398	public void setOnJinglePacketReceivedListener(
1399			final OnJinglePacketReceived listener) {
1400		this.jingleListener = listener;
1401			}
1402
1403	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1404		this.statusListener = listener;
1405	}
1406
1407	public void setOnBindListener(final OnBindListener listener) {
1408		this.bindListener = listener;
1409	}
1410
1411	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1412		this.acknowledgedListener = listener;
1413	}
1414
1415	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1416		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1417			this.advancedStreamFeaturesLoadedListeners.add(listener);
1418		}
1419	}
1420
1421	private void forceCloseSocket() {
1422		if (socket != null) {
1423			try {
1424				socket.close();
1425			} catch (IOException e) {
1426				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1427			}
1428		} else {
1429			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1430		}
1431	}
1432
1433	public void interrupt() {
1434		Thread.currentThread().interrupt();
1435	}
1436
1437	public void disconnect(final boolean force) {
1438		interrupt();
1439		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1440		if (force) {
1441			forceCloseSocket();
1442		} else {
1443			if (tagWriter.isActive()) {
1444				tagWriter.finish();
1445				try {
1446					int i = 0;
1447					boolean warned = false;
1448					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1449						if (!warned) {
1450							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1451							warned = true;
1452						}
1453						try {
1454							Thread.sleep(200);
1455						} catch(InterruptedException e) {
1456							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1457						}
1458						i++;
1459					}
1460					if (warned) {
1461						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1462					}
1463					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1464					tagWriter.writeTag(Tag.end("stream:stream"));
1465				} catch (final IOException e) {
1466					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1467				} finally {
1468					forceCloseSocket();
1469				}
1470			}
1471		}
1472	}
1473
1474	public void resetStreamId() {
1475		this.streamId = null;
1476	}
1477
1478	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1479		synchronized (this.disco) {
1480			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1481			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1482				if (cursor.getValue().getFeatures().contains(feature)) {
1483					items.add(cursor);
1484				}
1485			}
1486			return items;
1487		}
1488	}
1489
1490	public Jid findDiscoItemByFeature(final String feature) {
1491		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1492		if (items.size() >= 1) {
1493			return items.get(0).getKey();
1494		}
1495		return null;
1496	}
1497
1498	public boolean r() {
1499		if (getFeatures().sm()) {
1500			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1501			return true;
1502		} else {
1503			return false;
1504		}
1505	}
1506
1507	public String getMucServer() {
1508		synchronized (this.disco) {
1509			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1510				final ServiceDiscoveryResult value = cursor.getValue();
1511				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1512						&& !value.getFeatures().contains("jabber:iq:gateway")
1513						&& !value.hasIdentity("conference", "irc")) {
1514					return cursor.getKey().toString();
1515				}
1516			}
1517		}
1518		return null;
1519	}
1520
1521	public int getTimeToNextAttempt() {
1522		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1523		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1524		return interval - secondsSinceLast;
1525	}
1526
1527	public int getAttempt() {
1528		return this.attempt;
1529	}
1530
1531	public Features getFeatures() {
1532		return this.features;
1533	}
1534
1535	public long getLastSessionEstablished() {
1536		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1537		return System.currentTimeMillis() - diff;
1538	}
1539
1540	public long getLastConnect() {
1541		return this.lastConnect;
1542	}
1543
1544	public long getLastPingSent() {
1545		return this.lastPingSent;
1546	}
1547
1548	public long getLastDiscoStarted() {
1549		return this.lastDiscoStarted;
1550	}
1551	public long getLastPacketReceived() {
1552		return this.lastPacketReceived;
1553	}
1554
1555	public void sendActive() {
1556		this.sendPacket(new ActivePacket());
1557	}
1558
1559	public void sendInactive() {
1560		this.sendPacket(new InactivePacket());
1561	}
1562
1563	public void resetAttemptCount(boolean resetConnectTime) {
1564		this.attempt = 0;
1565		if (resetConnectTime) {
1566			this.lastConnect = 0;
1567		}
1568	}
1569
1570	public void setInteractive(boolean interactive) {
1571		this.mInteractive = interactive;
1572	}
1573
1574	public Identity getServerIdentity() {
1575		synchronized (this.disco) {
1576			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1577			if (result == null) {
1578				return Identity.UNKNOWN;
1579			}
1580			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1581				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1582					switch (id.getName()) {
1583						case "Prosody":
1584							return Identity.PROSODY;
1585						case "ejabberd":
1586							return Identity.EJABBERD;
1587						case "Slack-XMPP":
1588							return Identity.SLACK;
1589					}
1590				}
1591			}
1592		}
1593		return Identity.UNKNOWN;
1594	}
1595
1596	private class StateChangingError extends Error {
1597		private final Account.State state;
1598
1599		public StateChangingError(Account.State state) {
1600			this.state = state;
1601		}
1602	}
1603
1604	private class StateChangingException extends IOException {
1605		private final Account.State state;
1606
1607		public StateChangingException(Account.State state) {
1608			this.state = state;
1609		}
1610	}
1611
1612	public enum Identity {
1613		FACEBOOK,
1614		SLACK,
1615		EJABBERD,
1616		PROSODY,
1617		NIMBUZZ,
1618		UNKNOWN
1619	}
1620
1621	public class Features {
1622		XmppConnection connection;
1623		private boolean carbonsEnabled = false;
1624		private boolean encryptionEnabled = false;
1625		private boolean blockListRequested = false;
1626
1627		public Features(final XmppConnection connection) {
1628			this.connection = connection;
1629		}
1630
1631		private boolean hasDiscoFeature(final Jid server, final String feature) {
1632			synchronized (XmppConnection.this.disco) {
1633				return connection.disco.containsKey(server) &&
1634						connection.disco.get(server).getFeatures().contains(feature);
1635			}
1636		}
1637
1638		public boolean carbons() {
1639			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1640		}
1641
1642		public boolean blocking() {
1643			return hasDiscoFeature(account.getServer(), Namespace.BLOCKING);
1644		}
1645
1646		public boolean spamReporting() {
1647			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1648		}
1649
1650		public boolean register() {
1651			return hasDiscoFeature(account.getServer(), Namespace.REGISTER);
1652		}
1653
1654		public boolean sm() {
1655			return streamId != null
1656					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1657		}
1658
1659		public boolean csi() {
1660			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1661		}
1662
1663		public boolean pep() {
1664			synchronized (XmppConnection.this.disco) {
1665				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1666				return info != null && info.hasIdentity("pubsub", "pep");
1667			}
1668		}
1669
1670		public boolean pepPersistent() {
1671			synchronized (XmppConnection.this.disco) {
1672				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1673				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1674			}
1675		}
1676
1677		public boolean mam() {
1678			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1679					|| hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1680		}
1681
1682		public boolean mamLegacy() {
1683			return !hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM)
1684					&& hasDiscoFeature(account.getJid().toBareJid(), Namespace.MAM_LEGACY);
1685		}
1686
1687		public boolean push() {
1688			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1689					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1690		}
1691
1692		public boolean rosterVersioning() {
1693			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1694		}
1695
1696		public void setBlockListRequested(boolean value) {
1697			this.blockListRequested = value;
1698		}
1699
1700		public boolean httpUpload(long filesize) {
1701			if (Config.DISABLE_HTTP_UPLOAD) {
1702				return false;
1703			} else {
1704				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1705				if (items.size() > 0) {
1706					try {
1707						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1708						if(filesize <= maxsize) {
1709							return true;
1710						} else {
1711							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1712							return false;
1713						}
1714					} catch (Exception e) {
1715						return true;
1716					}
1717				} else {
1718					return false;
1719				}
1720			}
1721		}
1722
1723		public long getMaxHttpUploadSize() {
1724			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Namespace.HTTP_UPLOAD);
1725				if (items.size() > 0) {
1726					try {
1727						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Namespace.HTTP_UPLOAD, "max-file-size"));
1728					} catch (Exception e) {
1729						return -1;
1730					}
1731				} else {
1732					return -1;
1733				}
1734		}
1735
1736		public boolean stanzaIds() {
1737			return hasDiscoFeature(account.getJid().toBareJid(), Namespace.STANZA_IDS);
1738		}
1739	}
1740
1741	private IqGenerator getIqGenerator() {
1742		return mXmppConnectionService.getIqGenerator();
1743	}
1744}