1package eu.siacs.conversations.xmpp;
   2
   3import android.graphics.Bitmap;
   4import android.graphics.BitmapFactory;
   5import android.os.Bundle;
   6import android.os.Parcelable;
   7import android.os.PowerManager;
   8import android.os.PowerManager.WakeLock;
   9import android.os.SystemClock;
  10import android.security.KeyChain;
  11import android.util.Base64;
  12import android.util.Log;
  13import android.util.Pair;
  14import android.util.SparseArray;
  15
  16import org.xmlpull.v1.XmlPullParserException;
  17
  18import java.io.ByteArrayInputStream;
  19import java.io.IOException;
  20import java.io.InputStream;
  21import java.math.BigInteger;
  22import java.net.ConnectException;
  23import java.net.IDN;
  24import java.net.InetAddress;
  25import java.net.InetSocketAddress;
  26import java.net.Socket;
  27import java.net.URL;
  28import java.net.UnknownHostException;
  29import java.security.KeyManagementException;
  30import java.security.NoSuchAlgorithmException;
  31import java.security.Principal;
  32import java.security.PrivateKey;
  33import java.security.cert.X509Certificate;
  34import java.util.ArrayList;
  35import java.util.Arrays;
  36import java.util.HashMap;
  37import java.util.Hashtable;
  38import java.util.Iterator;
  39import java.util.List;
  40import java.util.Map.Entry;
  41import java.util.concurrent.atomic.AtomicBoolean;
  42import java.util.concurrent.atomic.AtomicInteger;
  43
  44import javax.net.ssl.HostnameVerifier;
  45import javax.net.ssl.KeyManager;
  46import javax.net.ssl.SSLContext;
  47import javax.net.ssl.SSLSession;
  48import javax.net.ssl.SSLSocket;
  49import javax.net.ssl.SSLSocketFactory;
  50import javax.net.ssl.X509KeyManager;
  51import javax.net.ssl.X509TrustManager;
  52
  53import de.duenndns.ssl.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.XmppConnectionService;
  68import eu.siacs.conversations.utils.DNSHelper;
  69import eu.siacs.conversations.utils.SSLSocketHelper;
  70import eu.siacs.conversations.utils.SocksSocketFactory;
  71import eu.siacs.conversations.utils.Xmlns;
  72import eu.siacs.conversations.xml.Element;
  73import eu.siacs.conversations.xml.Tag;
  74import eu.siacs.conversations.xml.TagWriter;
  75import eu.siacs.conversations.xml.XmlReader;
  76import eu.siacs.conversations.xmpp.forms.Data;
  77import eu.siacs.conversations.xmpp.forms.Field;
  78import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  79import eu.siacs.conversations.xmpp.jid.Jid;
  80import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
  81import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
  82import eu.siacs.conversations.xmpp.stanzas.AbstractAcknowledgeableStanza;
  83import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
  84import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  85import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  86import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
  87import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
  88import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
  89import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
  90import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
  91import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
  92import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
  93
  94public class XmppConnection implements Runnable {
  95
  96	private static final int PACKET_IQ = 0;
  97	private static final int PACKET_MESSAGE = 1;
  98	private static final int PACKET_PRESENCE = 2;
  99	protected Account account;
 100	private final WakeLock wakeLock;
 101	private Socket socket;
 102	private XmlReader tagReader;
 103	private TagWriter tagWriter;
 104	private final Features features = new Features(this);
 105	private boolean needsBinding = true;
 106	private boolean shouldAuthenticate = true;
 107	private Element streamFeatures;
 108	private final HashMap<Jid, ServiceDiscoveryResult> disco = new HashMap<>();
 109
 110	private String streamId = null;
 111	private int smVersion = 3;
 112	private final SparseArray<AbstractAcknowledgeableStanza> mStanzaQueue = new SparseArray<>();
 113
 114	private int stanzasReceived = 0;
 115	private int stanzasSent = 0;
 116	private long lastPacketReceived = 0;
 117	private long lastPingSent = 0;
 118	private long lastConnect = 0;
 119	private long lastSessionStarted = 0;
 120	private long lastDiscoStarted = 0;
 121	private AtomicInteger mPendingServiceDiscoveries = new AtomicInteger(0);
 122	private AtomicBoolean mWaitForDisco = new AtomicBoolean(true);
 123	private boolean mInteractive = false;
 124	private int attempt = 0;
 125	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 126	private OnPresencePacketReceived presenceListener = null;
 127	private OnJinglePacketReceived jingleListener = null;
 128	private OnIqPacketReceived unregisteredIqListener = null;
 129	private OnMessagePacketReceived messageListener = null;
 130	private OnStatusChanged statusListener = null;
 131	private OnBindListener bindListener = null;
 132	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 133	private OnMessageAcknowledged acknowledgedListener = null;
 134	private XmppConnectionService mXmppConnectionService = null;
 135
 136	private SaslMechanism saslMechanism;
 137
 138	private class MyKeyManager implements X509KeyManager {
 139		@Override
 140		public String chooseClientAlias(String[] strings, Principal[] principals, Socket socket) {
 141			return account.getPrivateKeyAlias();
 142		}
 143
 144		@Override
 145		public String chooseServerAlias(String s, Principal[] principals, Socket socket) {
 146			return null;
 147		}
 148
 149		@Override
 150		public X509Certificate[] getCertificateChain(String alias) {
 151			Log.d(Config.LOGTAG,"getting certificate chain");
 152			try {
 153				return KeyChain.getCertificateChain(mXmppConnectionService, alias);
 154			} catch (Exception e) {
 155				Log.d(Config.LOGTAG,e.getMessage());
 156				return new X509Certificate[0];
 157			}
 158		}
 159
 160		@Override
 161		public String[] getClientAliases(String s, Principal[] principals) {
 162			return new String[0];
 163		}
 164
 165		@Override
 166		public String[] getServerAliases(String s, Principal[] principals) {
 167			return new String[0];
 168		}
 169
 170		@Override
 171		public PrivateKey getPrivateKey(String alias) {
 172			try {
 173				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 174			} catch (Exception e) {
 175				return null;
 176			}
 177		}
 178	}
 179
 180	public final OnIqPacketReceived registrationResponseListener =  new OnIqPacketReceived() {
 181		@Override
 182		public void onIqPacketReceived(Account account, IqPacket packet) {
 183			if (packet.getType() == IqPacket.TYPE.RESULT) {
 184				account.setOption(Account.OPTION_REGISTER, false);
 185				forceCloseSocket();
 186				changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 187			} else {
 188				final List<String> PASSWORD_TOO_WEAK_MSGS = Arrays.asList(
 189						"The password is too weak",
 190						"Please use a longer password.");
 191				Element error = packet.findChild("error");
 192				Account.State state = Account.State.REGISTRATION_FAILED;
 193				if (error != null) {
 194					if (error.hasChild("conflict")) {
 195						state = Account.State.REGISTRATION_CONFLICT;
 196					} else if (error.hasChild("resource-constraint")
 197							&& "wait".equals(error.getAttribute("type"))) {
 198						state = Account.State.REGISTRATION_PLEASE_WAIT;
 199					} else if (error.hasChild("not-acceptable")
 200							&& PASSWORD_TOO_WEAK_MSGS.contains(error.findChildContent("text"))) {
 201						state = Account.State.REGISTRATION_PASSWORD_TOO_WEAK;
 202					}
 203				}
 204				changeStatus(state);
 205				forceCloseSocket();
 206			}
 207		}
 208	};
 209
 210	public XmppConnection(final Account account, final XmppConnectionService service) {
 211		this.account = account;
 212		this.wakeLock = service.getPowerManager().newWakeLock(
 213				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 214		mXmppConnectionService = service;
 215	}
 216
 217	protected synchronized void changeStatus(final Account.State nextStatus) {
 218		if (Thread.currentThread().isInterrupted()) {
 219			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not changing status to "+nextStatus+" because thread was interrupted");
 220		}
 221		if (account.getStatus() != nextStatus) {
 222			if ((nextStatus == Account.State.OFFLINE)
 223					&& (account.getStatus() != Account.State.CONNECTING)
 224					&& (account.getStatus() != Account.State.ONLINE)
 225					&& (account.getStatus() != Account.State.DISABLED)) {
 226				return;
 227					}
 228			if (nextStatus == Account.State.ONLINE) {
 229				this.attempt = 0;
 230			}
 231			account.setStatus(nextStatus);
 232			if (statusListener != null) {
 233				statusListener.onStatusChanged(account);
 234			}
 235		}
 236	}
 237
 238	public void prepareNewConnection() {
 239		this.lastConnect = SystemClock.elapsedRealtime();
 240		this.lastPingSent = SystemClock.elapsedRealtime();
 241		this.lastDiscoStarted = Long.MAX_VALUE;
 242		this.changeStatus(Account.State.CONNECTING);
 243	}
 244
 245	protected void connect() {
 246		if (mXmppConnectionService.areMessagesInitialized()) {
 247			mXmppConnectionService.resetSendingToWaiting(account);
 248		}
 249		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 250		features.encryptionEnabled = false;
 251		this.attempt++;
 252		try {
 253			Socket localSocket;
 254			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 255			this.changeStatus(Account.State.CONNECTING);
 256			final boolean useTor = mXmppConnectionService.useTorToConnect() || account.isOnion();
 257			final boolean extended = mXmppConnectionService.showExtendedConnectionOptions();
 258			if (useTor) {
 259				String destination;
 260				if (account.getHostname() == null || account.getHostname().isEmpty()) {
 261					destination = account.getServer().toString();
 262				} else {
 263					destination = account.getHostname();
 264				}
 265				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": connect to " + destination + " via Tor");
 266				localSocket = SocksSocketFactory.createSocketOverTor(destination, account.getPort());
 267				try {
 268					startXmpp(localSocket);
 269				} catch (InterruptedException e) {
 270					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 271					return;
 272				} catch (Exception e) {
 273					throw new IOException(e.getMessage());
 274				}
 275			} else if (extended && account.getHostname() != null && !account.getHostname().isEmpty()) {
 276
 277				InetSocketAddress address = new InetSocketAddress(account.getHostname(), account.getPort());
 278
 279				features.encryptionEnabled = account.getPort() == 5223;
 280
 281				try {
 282					if (features.encryptionEnabled) {
 283						try {
 284							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 285							localSocket = tlsFactoryVerifier.factory.createSocket();
 286							localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 287							final SSLSession session = ((SSLSocket) localSocket).getSession();
 288							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), session)) {
 289								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 290								throw new SecurityException();
 291							}
 292						} catch (KeyManagementException e) {
 293							features.encryptionEnabled = false;
 294							localSocket = new Socket();
 295						}
 296					} else {
 297						localSocket = new Socket();
 298						localSocket.connect(address, Config.SOCKET_TIMEOUT * 1000);
 299					}
 300				} catch (IOException e) {
 301					throw new UnknownHostException();
 302				}
 303				try {
 304					startXmpp(localSocket);
 305				} catch (InterruptedException e) {
 306					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 307					return;
 308				} catch (Exception e) {
 309					throw new IOException(e.getMessage());
 310				}
 311			} else if (DNSHelper.isIp(account.getServer().toString())) {
 312				localSocket = new Socket();
 313				try {
 314					localSocket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 315				} catch (IOException e) {
 316					throw new UnknownHostException();
 317				}
 318				try {
 319					startXmpp(localSocket);
 320				} catch (InterruptedException e) {
 321					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 322					return;
 323				} catch (Exception e) {
 324					throw new IOException(e.getMessage());
 325				}
 326			} else {
 327				final Bundle result = DNSHelper.getSRVRecord(account.getServer(), mXmppConnectionService);
 328				final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
 329				for (Iterator<Parcelable> iterator = values.iterator(); iterator.hasNext(); ) {
 330					if (Thread.currentThread().isInterrupted()) {
 331						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Thread was interrupted");
 332						return;
 333					}
 334					final Bundle namePort = (Bundle) iterator.next();
 335					try {
 336						String srvRecordServer;
 337						try {
 338							srvRecordServer = IDN.toASCII(namePort.getString("name"));
 339						} catch (final IllegalArgumentException e) {
 340							// TODO: Handle me?`
 341							srvRecordServer = "";
 342						}
 343						final int srvRecordPort = namePort.getInt("port");
 344						final String srvIpServer = namePort.getString("ip");
 345						// if tls is true, encryption is implied and must not be started
 346						features.encryptionEnabled = namePort.getBoolean("tls");
 347						final InetSocketAddress addr;
 348						if (srvIpServer != null) {
 349							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
 350							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 351									+ ": using values from dns " + srvRecordServer
 352									+ "[" + srvIpServer + "]:" + srvRecordPort + " tls: " + features.encryptionEnabled);
 353						} else {
 354							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
 355							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 356									+ ": using values from dns "
 357									+ srvRecordServer + ":" + srvRecordPort + " tls: " + features.encryptionEnabled);
 358						}
 359
 360						if (!features.encryptionEnabled) {
 361							localSocket = new Socket();
 362							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 363						} else {
 364							final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 365							localSocket = tlsFactoryVerifier.factory.createSocket();
 366
 367							if (localSocket == null) {
 368								throw new IOException("could not initialize ssl socket");
 369							}
 370
 371							SSLSocketHelper.setSecurity((SSLSocket) localSocket);
 372							SSLSocketHelper.setSNIHost(tlsFactoryVerifier.factory, (SSLSocket) localSocket, account.getServer().getDomainpart());
 373							SSLSocketHelper.setAlpnProtocol(tlsFactoryVerifier.factory, (SSLSocket) localSocket, "xmpp-client");
 374
 375							localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 376
 377							if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), ((SSLSocket) localSocket).getSession())) {
 378								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 379								throw new SecurityException();
 380							}
 381						}
 382						if (startXmpp(localSocket)) {
 383							break; // successfully connected to server that speaks xmpp
 384						} else {
 385							localSocket.close();
 386						}
 387					} catch (final SecurityException e) {
 388						throw e;
 389					} catch (InterruptedException e) {
 390						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": thread was interrupted before beginning stream");
 391						return;
 392					} catch (final Throwable e) {
 393						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
 394						if (!iterator.hasNext()) {
 395							throw new UnknownHostException();
 396						}
 397					}
 398				}
 399			}
 400			processStream();
 401		}  catch (final java.lang.SecurityException e) {
 402			this.changeStatus(Account.State.MISSING_INTERNET_PERMISSION);
 403		} catch (final RegistrationNotSupportedException e) {
 404			this.changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
 405		} catch (final IncompatibleServerException e) {
 406			this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
 407		} catch (final SecurityException e) {
 408			this.changeStatus(Account.State.SECURITY_ERROR);
 409		} catch (final UnauthorizedException e) {
 410			this.changeStatus(Account.State.UNAUTHORIZED);
 411		} catch (final PaymentRequiredException e) {
 412			this.changeStatus(Account.State.PAYMENT_REQUIRED);
 413		} catch (final UnknownHostException | ConnectException e) {
 414			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 415		} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
 416			this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
 417		} catch(final StreamErrorHostUnknown e) {
 418			this.changeStatus(Account.State.HOST_UNKNOWN);
 419		} catch(final StreamErrorPolicyViolation e) {
 420			this.changeStatus(Account.State.POLICY_VIOLATION);
 421		} catch(final StreamError e) {
 422			this.changeStatus(Account.State.STREAM_ERROR);
 423		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 424			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 425			this.changeStatus(Account.State.OFFLINE);
 426			this.attempt = Math.max(0, this.attempt - 1);
 427		} finally {
 428			if (!Thread.currentThread().isInterrupted()) {
 429				forceCloseSocket();
 430				if (wakeLock.isHeld()) {
 431					try {
 432						wakeLock.release();
 433					} catch (final RuntimeException ignored) {
 434					}
 435				}
 436			} else {
 437				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": not force closing socket and releasing wake lock because thread was interrupted");
 438			}
 439		}
 440	}
 441
 442	/**
 443	 * Starts xmpp protocol, call after connecting to socket
 444	 * @return true if server returns with valid xmpp, false otherwise
 445     */
 446	private boolean startXmpp(Socket socket) throws Exception {
 447		if (Thread.currentThread().isInterrupted()) {
 448			throw new InterruptedException();
 449		}
 450		this.socket = socket;
 451		tagReader = new XmlReader(wakeLock);
 452		if (tagWriter != null) tagWriter.forceClose();
 453		tagWriter = new TagWriter();
 454		tagWriter.setOutputStream(socket.getOutputStream());
 455		tagReader.setInputStream(socket.getInputStream());
 456		tagWriter.beginDocument();
 457		sendStartStream();
 458		final Tag tag = tagReader.readTag();
 459		return tag != null && tag.isStart("stream");
 460	}
 461
 462	private static class TlsFactoryVerifier {
 463		private final SSLSocketFactory factory;
 464		private final HostnameVerifier verifier;
 465
 466		public TlsFactoryVerifier(final SSLSocketFactory factory, final HostnameVerifier verifier) throws IOException {
 467			this.factory = factory;
 468			this.verifier = verifier;
 469			if (factory == null || verifier == null) {
 470				throw new IOException("could not setup ssl");
 471			}
 472		}
 473	}
 474
 475	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 476		final SSLContext sc = SSLSocketHelper.getSSLContext();
 477		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 478		KeyManager[] keyManager;
 479		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 480			keyManager = new KeyManager[]{new MyKeyManager()};
 481		} else {
 482			keyManager = null;
 483		}
 484		String domain = account.getJid().getDomainpart();
 485		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager.getInteractive(domain) : trustManager.getNonInteractive(domain)}, mXmppConnectionService.getRNG());
 486		final SSLSocketFactory factory = sc.getSocketFactory();
 487		final HostnameVerifier verifier;
 488		if (mInteractive) {
 489			verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier());
 490		} else {
 491			verifier = trustManager.wrapHostnameVerifierNonInteractive(new XmppDomainVerifier());
 492		}
 493
 494		return new TlsFactoryVerifier(factory, verifier);
 495	}
 496
 497	@Override
 498	public void run() {
 499		forceCloseSocket();
 500		connect();
 501	}
 502
 503	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 504		Tag nextTag = tagReader.readTag();
 505		while (nextTag != null && !nextTag.isEnd("stream")) {
 506			if (nextTag.isStart("error")) {
 507				processStreamError(nextTag);
 508			} else if (nextTag.isStart("features")) {
 509				processStreamFeatures(nextTag);
 510			} else if (nextTag.isStart("proceed")) {
 511				switchOverToTls(nextTag);
 512			} else if (nextTag.isStart("success")) {
 513				final String challenge = tagReader.readElement(nextTag).getContent();
 514				try {
 515					saslMechanism.getResponse(challenge);
 516				} catch (final SaslMechanism.AuthenticationException e) {
 517					disconnect(true);
 518					Log.e(Config.LOGTAG, String.valueOf(e));
 519				}
 520				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 521				account.setKey(Account.PINNED_MECHANISM_KEY,
 522						String.valueOf(saslMechanism.getPriority()));
 523				tagReader.reset();
 524				sendStartStream();
 525				final Tag tag = tagReader.readTag();
 526				if (tag != null && tag.isStart("stream")) {
 527					processStream();
 528				} else {
 529					throw new IOException("server didn't restart stream after successful auth");
 530				}
 531				break;
 532			} else if (nextTag.isStart("failure")) {
 533				final Element failure = tagReader.readElement(nextTag);
 534				final String text = failure.findChildContent("text");
 535				if (failure.hasChild("account-disabled")
 536						&& text != null
 537						&& text.contains("renew")
 538						&& Config.MAGIC_CREATE_DOMAIN != null
 539						&& text.contains(Config.MAGIC_CREATE_DOMAIN)) {
 540					throw new PaymentRequiredException();
 541				} else {
 542					throw new UnauthorizedException();
 543				}
 544			} else if (nextTag.isStart("challenge")) {
 545				final String challenge = tagReader.readElement(nextTag).getContent();
 546				final Element response = new Element("response");
 547				response.setAttribute("xmlns",
 548						"urn:ietf:params:xml:ns:xmpp-sasl");
 549				try {
 550					response.setContent(saslMechanism.getResponse(challenge));
 551				} catch (final SaslMechanism.AuthenticationException e) {
 552					// TODO: Send auth abort tag.
 553					Log.e(Config.LOGTAG, e.toString());
 554				}
 555				tagWriter.writeElement(response);
 556			} else if (nextTag.isStart("enabled")) {
 557				final Element enabled = tagReader.readElement(nextTag);
 558				if ("true".equals(enabled.getAttribute("resume"))) {
 559					this.streamId = enabled.getAttribute("id");
 560					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 561							+ ": stream management(" + smVersion
 562							+ ") enabled (resumable)");
 563				} else {
 564					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 565							+ ": stream management(" + smVersion + ") enabled");
 566				}
 567				this.stanzasReceived = 0;
 568				final RequestPacket r = new RequestPacket(smVersion);
 569				tagWriter.writeStanzaAsync(r);
 570			} else if (nextTag.isStart("resumed")) {
 571				lastPacketReceived = SystemClock.elapsedRealtime();
 572				final Element resumed = tagReader.readElement(nextTag);
 573				final String h = resumed.getAttribute("h");
 574				try {
 575					ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 576					synchronized (this.mStanzaQueue) {
 577						final int serverCount = Integer.parseInt(h);
 578						if (serverCount != stanzasSent) {
 579							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 580									+ ": session resumed with lost packages");
 581							stanzasSent = serverCount;
 582						} else {
 583							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 584						}
 585						acknowledgeStanzaUpTo(serverCount);
 586						for (int i = 0; i < this.mStanzaQueue.size(); ++i) {
 587							failedStanzas.add(mStanzaQueue.valueAt(i));
 588						}
 589						mStanzaQueue.clear();
 590					}
 591					Log.d(Config.LOGTAG, "resending " + failedStanzas.size() + " stanzas");
 592					for (AbstractAcknowledgeableStanza packet : failedStanzas) {
 593						if (packet instanceof MessagePacket) {
 594							MessagePacket message = (MessagePacket) packet;
 595							mXmppConnectionService.markMessage(account,
 596									message.getTo().toBareJid(),
 597									message.getId(),
 598									Message.STATUS_UNSEND);
 599						}
 600						sendPacket(packet);
 601					}
 602				} catch (final NumberFormatException ignored) {
 603				}
 604				Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 605				changeStatus(Account.State.ONLINE);
 606			} else if (nextTag.isStart("r")) {
 607				tagReader.readElement(nextTag);
 608				if (Config.EXTENDED_SM_LOGGING) {
 609					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 610				}
 611				final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 612				tagWriter.writeStanzaAsync(ack);
 613			} else if (nextTag.isStart("a")) {
 614				final Element ack = tagReader.readElement(nextTag);
 615				lastPacketReceived = SystemClock.elapsedRealtime();
 616				try {
 617					synchronized (this.mStanzaQueue) {
 618						final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 619						acknowledgeStanzaUpTo(serverSequence);
 620					}
 621				} catch (NumberFormatException | NullPointerException e) {
 622					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 623				}
 624			} else if (nextTag.isStart("failed")) {
 625				Element failed = tagReader.readElement(nextTag);
 626				try {
 627					final int serverCount = Integer.parseInt(failed.getAttribute("h"));
 628					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed but server acknowledged stanza #"+serverCount);
 629					synchronized (this.mStanzaQueue) {
 630						acknowledgeStanzaUpTo(serverCount);
 631					}
 632				} catch (NumberFormatException | NullPointerException e) {
 633					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": resumption failed");
 634				}
 635				resetStreamId();
 636				if (account.getStatus() != Account.State.ONLINE) {
 637					sendBindRequest();
 638				}
 639			} else if (nextTag.isStart("iq")) {
 640				processIq(nextTag);
 641			} else if (nextTag.isStart("message")) {
 642				processMessage(nextTag);
 643			} else if (nextTag.isStart("presence")) {
 644				processPresence(nextTag);
 645			}
 646			nextTag = tagReader.readTag();
 647		}
 648	}
 649
 650	private void acknowledgeStanzaUpTo(int serverCount) {
 651		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 652			if (serverCount >= mStanzaQueue.keyAt(i)) {
 653				if (Config.EXTENDED_SM_LOGGING) {
 654					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 655				}
 656				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 657				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 658					MessagePacket packet = (MessagePacket) stanza;
 659					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 660				}
 661				mStanzaQueue.removeAt(i);
 662				i--;
 663			}
 664		}
 665	}
 666
 667	private Element processPacket(final Tag currentTag, final int packetType)
 668		throws XmlPullParserException, IOException {
 669		Element element;
 670		switch (packetType) {
 671			case PACKET_IQ:
 672				element = new IqPacket();
 673				break;
 674			case PACKET_MESSAGE:
 675				element = new MessagePacket();
 676				break;
 677			case PACKET_PRESENCE:
 678				element = new PresencePacket();
 679				break;
 680			default:
 681				return null;
 682		}
 683		element.setAttributes(currentTag.getAttributes());
 684		Tag nextTag = tagReader.readTag();
 685		if (nextTag == null) {
 686			throw new IOException("interrupted mid tag");
 687		}
 688		while (!nextTag.isEnd(element.getName())) {
 689			if (!nextTag.isNo()) {
 690				final Element child = tagReader.readElement(nextTag);
 691				final String type = currentTag.getAttribute("type");
 692				if (packetType == PACKET_IQ
 693						&& "jingle".equals(child.getName())
 694						&& ("set".equalsIgnoreCase(type) || "get"
 695							.equalsIgnoreCase(type))) {
 696					element = new JinglePacket();
 697					element.setAttributes(currentTag.getAttributes());
 698							}
 699				element.addChild(child);
 700			}
 701			nextTag = tagReader.readTag();
 702			if (nextTag == null) {
 703				throw new IOException("interrupted mid tag");
 704			}
 705		}
 706		if (stanzasReceived == Integer.MAX_VALUE) {
 707			resetStreamId();
 708			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 709		}
 710		++stanzasReceived;
 711		lastPacketReceived = SystemClock.elapsedRealtime();
 712		if (Config.BACKGROUND_STANZA_LOGGING && mXmppConnectionService.checkListeners()) {
 713			Log.d(Config.LOGTAG,"[background stanza] "+element);
 714		}
 715		return element;
 716	}
 717
 718	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 719		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 720
 721		if (packet.getId() == null) {
 722			return; // an iq packet without id is definitely invalid
 723		}
 724
 725		if (packet instanceof JinglePacket) {
 726			if (this.jingleListener != null) {
 727				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 728			}
 729		} else {
 730			OnIqPacketReceived callback = null;
 731			synchronized (this.packetCallbacks) {
 732				if (packetCallbacks.containsKey(packet.getId())) {
 733					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 734					// Packets to the server should have responses from the server
 735					if (packetCallbackDuple.first.toServer(account)) {
 736						if (packet.fromServer(account)) {
 737							callback = packetCallbackDuple.second;
 738							packetCallbacks.remove(packet.getId());
 739						} else {
 740							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 741						}
 742					} else {
 743						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 744							callback = packetCallbackDuple.second;
 745							packetCallbacks.remove(packet.getId());
 746						} else {
 747							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 748						}
 749					}
 750				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 751					callback = this.unregisteredIqListener;
 752				}
 753			}
 754			if (callback != null) {
 755				callback.onIqPacketReceived(account,packet);
 756			}
 757		}
 758	}
 759
 760	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 761		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 762		this.messageListener.onMessagePacketReceived(account, packet);
 763	}
 764
 765	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 766		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 767		this.presenceListener.onPresencePacketReceived(account, packet);
 768	}
 769
 770	private void sendStartTLS() throws IOException {
 771		final Tag startTLS = Tag.empty("starttls");
 772		startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
 773		tagWriter.writeTag(startTLS);
 774	}
 775
 776
 777
 778	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 779		tagReader.readTag();
 780		try {
 781			final TlsFactoryVerifier tlsFactoryVerifier = getTlsFactoryVerifier();
 782			final InetAddress address = socket == null ? null : socket.getInetAddress();
 783
 784			if (address == null) {
 785				throw new IOException("could not setup ssl");
 786			}
 787
 788			final SSLSocket sslSocket = (SSLSocket) tlsFactoryVerifier.factory.createSocket(socket, address.getHostAddress(), socket.getPort(), true);
 789
 790			if (sslSocket == null) {
 791				throw new IOException("could not initialize ssl socket");
 792			}
 793
 794			SSLSocketHelper.setSecurity(sslSocket);
 795
 796			if (!tlsFactoryVerifier.verifier.verify(account.getServer().getDomainpart(), sslSocket.getSession())) {
 797				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 798				throw new SecurityException();
 799			}
 800			tagReader.setInputStream(sslSocket.getInputStream());
 801			tagWriter.setOutputStream(sslSocket.getOutputStream());
 802			sendStartStream();
 803			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 804			features.encryptionEnabled = true;
 805			final Tag tag = tagReader.readTag();
 806			if (tag != null && tag.isStart("stream")) {
 807				processStream();
 808			} else {
 809				throw new IOException("server didn't restart stream after STARTTLS");
 810			}
 811			sslSocket.close();
 812		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 813			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 814			throw new SecurityException();
 815		}
 816	}
 817
 818	private void processStreamFeatures(final Tag currentTag)
 819		throws XmlPullParserException, IOException {
 820		this.streamFeatures = tagReader.readElement(currentTag);
 821		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 822			sendStartTLS();
 823		} else if (this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 824			if (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS) {
 825				sendRegistryRequest();
 826			} else {
 827				throw new IncompatibleServerException();
 828			}
 829		} else if (!this.streamFeatures.hasChild("register") && account.isOptionSet(Account.OPTION_REGISTER)) {
 830			throw new RegistrationNotSupportedException();
 831		} else if (this.streamFeatures.hasChild("mechanisms")
 832				&& shouldAuthenticate
 833				&& (features.encryptionEnabled || Config.ALLOW_NON_TLS_CONNECTIONS)) {
 834			authenticate();
 835		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 836			if (Config.EXTENDED_SM_LOGGING) {
 837				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 838			}
 839			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 840			this.tagWriter.writeStanzaAsync(resume);
 841		} else if (needsBinding) {
 842			if (this.streamFeatures.hasChild("bind")) {
 843				sendBindRequest();
 844			} else {
 845				throw new IncompatibleServerException();
 846			}
 847		}
 848	}
 849
 850	private void authenticate() throws IOException {
 851		final List<String> mechanisms = extractMechanisms(streamFeatures
 852				.findChild("mechanisms"));
 853		final Element auth = new Element("auth");
 854		auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
 855		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 856			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 857		} else if (mechanisms.contains("SCRAM-SHA-256")) {
 858			saslMechanism = new ScramSha256(tagWriter, account, mXmppConnectionService.getRNG());
 859		} else if (mechanisms.contains("SCRAM-SHA-1")) {
 860			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 861		} else if (mechanisms.contains("PLAIN")) {
 862			saslMechanism = new Plain(tagWriter, account);
 863		} else if (mechanisms.contains("DIGEST-MD5")) {
 864			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 865		} else if (mechanisms.contains("ANONYMOUS")) {
 866			saslMechanism = new Anonymous(tagWriter, account, mXmppConnectionService.getRNG());
 867		}
 868		if (saslMechanism != null) {
 869			final int pinnedMechanism = account.getKeyAsInt(Account.PINNED_MECHANISM_KEY, -1);
 870			if (pinnedMechanism > saslMechanism.getPriority()) {
 871				Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 872						" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 873						") than pinned priority (" + pinnedMechanism +
 874						"). Possible downgrade attack?");
 875				throw new SecurityException();
 876			}
 877			Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 878			auth.setAttribute("mechanism", saslMechanism.getMechanism());
 879			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 880				auth.setContent(saslMechanism.getClientFirstMessage());
 881			}
 882			tagWriter.writeElement(auth);
 883		} else {
 884			throw new IncompatibleServerException();
 885		}
 886	}
 887
 888	private List<String> extractMechanisms(final Element stream) {
 889		final ArrayList<String> mechanisms = new ArrayList<>(stream
 890				.getChildren().size());
 891		for (final Element child : stream.getChildren()) {
 892			mechanisms.add(child.getContent());
 893		}
 894		return mechanisms;
 895	}
 896
 897	private void sendRegistryRequest() {
 898		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 899		register.query("jabber:iq:register");
 900		register.setTo(account.getServer());
 901		sendUnmodifiedIqPacket(register, new OnIqPacketReceived() {
 902
 903			@Override
 904			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 905				boolean failed = false;
 906				if (packet.getType() == IqPacket.TYPE.RESULT
 907						&& packet.query().hasChild("username")
 908						&& (packet.query().hasChild("password"))) {
 909					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 910					final Element username = new Element("username").setContent(account.getUsername());
 911					final Element password = new Element("password").setContent(account.getPassword());
 912					register.query("jabber:iq:register").addChild(username);
 913					register.query().addChild(password);
 914					register.setFrom(account.getJid().toBareJid());
 915					sendUnmodifiedIqPacket(register, registrationResponseListener);
 916				} else if (packet.getType() == IqPacket.TYPE.RESULT
 917						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 918					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 919					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 920					final String id = packet.getId();
 921
 922					Bitmap captcha = null;
 923					if (blob != null) {
 924						try {
 925							final String base64Blob = blob.getContent();
 926							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 927							InputStream stream = new ByteArrayInputStream(strBlob);
 928							captcha = BitmapFactory.decodeStream(stream);
 929						} catch (Exception e) {
 930							//ignored
 931						}
 932					} else {
 933						try {
 934							Field url = data.getFieldByName("url");
 935							String urlString = url.findChildContent("value");
 936							URL uri = new URL(urlString);
 937							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 938						} catch (IOException e) {
 939							Log.e(Config.LOGTAG, e.toString());
 940						}
 941					}
 942
 943					if (captcha != null) {
 944						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 945					}
 946				} else {
 947					failed = true;
 948				}
 949
 950				if (failed) {
 951					final Element instructions = packet.query().findChild("instructions");
 952					setAccountCreationFailed((instructions != null) ? instructions.getContent() : "");
 953				}
 954			}
 955		});
 956	}
 957
 958	private void setAccountCreationFailed(String instructions) {
 959		changeStatus(Account.State.REGISTRATION_FAILED);
 960		disconnect(true);
 961		Log.d(Config.LOGTAG, account.getJid().toBareJid()
 962				+ ": could not register. instructions are"
 963				+ instructions);
 964	}
 965
 966	public void resetEverything() {
 967		resetAttemptCount(true);
 968		resetStreamId();
 969		clearIqCallbacks();
 970		mStanzaQueue.clear();
 971		synchronized (this.disco) {
 972			disco.clear();
 973		}
 974	}
 975
 976	private void sendBindRequest() {
 977		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
 978			try {
 979				Thread.sleep(500);
 980			} catch (final InterruptedException ignored) {
 981			}
 982		}
 983		needsBinding = false;
 984		clearIqCallbacks();
 985		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
 986		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
 987				.addChild("resource").setContent(account.getResource());
 988		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
 989			@Override
 990			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 991				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 992					return;
 993				}
 994				final Element bind = packet.findChild("bind");
 995				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
 996					final Element jid = bind.findChild("jid");
 997					if (jid != null && jid.getContent() != null) {
 998						try {
 999							if (account.setJid(Jid.fromString(jid.getContent()))) {
1000								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": bare jid changed during bind. updating database");
1001								mXmppConnectionService.databaseBackend.updateAccount(account);
1002							}
1003							if (streamFeatures.hasChild("session")
1004									&& !streamFeatures.findChild("session").hasChild("optional")) {
1005								sendStartSession();
1006							} else {
1007								sendPostBindInitialization();
1008							}
1009							return;
1010						} catch (final InvalidJidException e) {
1011							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server reported invalid jid ("+jid.getContent()+") on bind");
1012						}
1013					} else {
1014						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure. (no jid)");
1015					}
1016				} else {
1017					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure (" + packet.toString());
1018				}
1019				forceCloseSocket();
1020				changeStatus(Account.State.BIND_FAILURE);
1021			}
1022		});
1023	}
1024
1025	private void clearIqCallbacks() {
1026		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
1027		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
1028		synchronized (this.packetCallbacks) {
1029			if (this.packetCallbacks.size() == 0) {
1030				return;
1031			}
1032			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
1033			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
1034			while (iterator.hasNext()) {
1035				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
1036				callbacks.add(entry.second);
1037				iterator.remove();
1038			}
1039		}
1040		for(OnIqPacketReceived callback : callbacks) {
1041			callback.onIqPacketReceived(account,failurePacket);
1042		}
1043		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
1044	}
1045
1046	public void sendDiscoTimeout() {
1047		if (mWaitForDisco.compareAndSet(true, false)) {
1048			finalizeBind();
1049		}
1050	}
1051
1052	private void sendStartSession() {
1053		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sending legacy session to outdated server");
1054		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
1055		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
1056		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
1057			@Override
1058			public void onIqPacketReceived(Account account, IqPacket packet) {
1059				if (packet.getType() == IqPacket.TYPE.RESULT) {
1060					sendPostBindInitialization();
1061				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1062					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not init sessions");
1063					disconnect(true);
1064				}
1065			}
1066		});
1067	}
1068
1069	private void sendPostBindInitialization() {
1070		smVersion = 0;
1071		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
1072			smVersion = 3;
1073		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
1074			smVersion = 2;
1075		}
1076		if (smVersion != 0) {
1077			synchronized (this.mStanzaQueue) {
1078				final EnablePacket enable = new EnablePacket(smVersion);
1079				tagWriter.writeStanzaAsync(enable);
1080				stanzasSent = 0;
1081				mStanzaQueue.clear();
1082			}
1083		}
1084		features.carbonsEnabled = false;
1085		features.blockListRequested = false;
1086		synchronized (this.disco) {
1087			this.disco.clear();
1088		}
1089		mPendingServiceDiscoveries.set(0);
1090		mWaitForDisco.set(smVersion != 0 && !account.getJid().getDomainpart().equalsIgnoreCase("nimbuzz.com"));
1091		lastDiscoStarted = SystemClock.elapsedRealtime();
1092		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": starting service discovery");
1093		mXmppConnectionService.scheduleWakeUpCall(Config.CONNECT_DISCO_TIMEOUT, account.getUuid().hashCode());
1094		Element caps = streamFeatures.findChild("c");
1095		final String hash = caps == null ? null : caps.getAttribute("hash");
1096		final String ver = caps == null ? null : caps.getAttribute("ver");
1097		ServiceDiscoveryResult discoveryResult = null;
1098		if (hash != null && ver != null) {
1099			discoveryResult = mXmppConnectionService.getCachedServiceDiscoveryResult(new Pair<>(hash, ver));
1100		}
1101		if (discoveryResult == null) {
1102			sendServiceDiscoveryInfo(account.getServer());
1103		} else {
1104			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server caps came from cache");
1105			disco.put(account.getServer(), discoveryResult);
1106		}
1107		sendServiceDiscoveryInfo(account.getJid().toBareJid());
1108		sendServiceDiscoveryItems(account.getServer());
1109
1110		if (!mWaitForDisco.get()) {
1111			finalizeBind();
1112		}
1113		this.lastSessionStarted = SystemClock.elapsedRealtime();
1114	}
1115
1116	private void sendServiceDiscoveryInfo(final Jid jid) {
1117		mPendingServiceDiscoveries.incrementAndGet();
1118		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1119		iq.setTo(jid);
1120		iq.query("http://jabber.org/protocol/disco#info");
1121		this.sendIqPacket(iq, new OnIqPacketReceived() {
1122
1123			@Override
1124			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1125				if (packet.getType() == IqPacket.TYPE.RESULT) {
1126					boolean advancedStreamFeaturesLoaded;
1127					synchronized (XmppConnection.this.disco) {
1128						ServiceDiscoveryResult result = new ServiceDiscoveryResult(packet);
1129						if (jid.equals(account.getServer())) {
1130							mXmppConnectionService.databaseBackend.insertDiscoveryResult(result);
1131						}
1132						disco.put(jid, result);
1133						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
1134								&& disco.containsKey(account.getJid().toBareJid());
1135					}
1136					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
1137						enableAdvancedStreamFeatures();
1138					}
1139				} else {
1140					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
1141				}
1142				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1143					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1144							&& mWaitForDisco.compareAndSet(true, false)) {
1145						finalizeBind();
1146					}
1147				}
1148			}
1149		});
1150	}
1151
1152	private void finalizeBind() {
1153		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
1154		if (bindListener != null) {
1155			bindListener.onBind(account);
1156		}
1157		changeStatus(Account.State.ONLINE);
1158	}
1159
1160	private void enableAdvancedStreamFeatures() {
1161		if (getFeatures().carbons() && !features.carbonsEnabled) {
1162			sendEnableCarbons();
1163		}
1164		if (getFeatures().blocking() && !features.blockListRequested) {
1165			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
1166			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1167		}
1168		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1169			listener.onAdvancedStreamFeaturesAvailable(account);
1170		}
1171	}
1172
1173	private void sendServiceDiscoveryItems(final Jid server) {
1174		mPendingServiceDiscoveries.incrementAndGet();
1175		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1176		iq.setTo(server.toDomainJid());
1177		iq.query("http://jabber.org/protocol/disco#items");
1178		this.sendIqPacket(iq, new OnIqPacketReceived() {
1179
1180			@Override
1181			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1182				if (packet.getType() == IqPacket.TYPE.RESULT) {
1183					final List<Element> elements = packet.query().getChildren();
1184					for (final Element element : elements) {
1185						if (element.getName().equals("item")) {
1186							final Jid jid = element.getAttributeAsJid("jid");
1187							if (jid != null && !jid.equals(account.getServer())) {
1188								sendServiceDiscoveryInfo(jid);
1189							}
1190						}
1191					}
1192				} else {
1193					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco items of " + server);
1194				}
1195				if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
1196					if (mPendingServiceDiscoveries.decrementAndGet() == 0
1197							&& mWaitForDisco.compareAndSet(true, false)) {
1198						finalizeBind();
1199					}
1200				}
1201			}
1202		});
1203	}
1204
1205	private void sendEnableCarbons() {
1206		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1207		iq.addChild("enable", "urn:xmpp:carbons:2");
1208		this.sendIqPacket(iq, new OnIqPacketReceived() {
1209
1210			@Override
1211			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1212				if (!packet.hasChild("error")) {
1213					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1214							+ ": successfully enabled carbons");
1215					features.carbonsEnabled = true;
1216				} else {
1217					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1218							+ ": error enableing carbons " + packet.toString());
1219				}
1220			}
1221		});
1222	}
1223
1224	private void processStreamError(final Tag currentTag)
1225		throws XmlPullParserException, IOException {
1226		final Element streamError = tagReader.readElement(currentTag);
1227		if (streamError == null) {
1228			return;
1229		}
1230		if (streamError.hasChild("conflict")) {
1231			final String resource = account.getResource().split("\\.")[0];
1232			account.setResource(resource + "." + nextRandomId());
1233			Log.d(Config.LOGTAG,
1234					account.getJid().toBareJid() + ": switching resource due to conflict ("
1235					+ account.getResource() + ")");
1236			throw new IOException();
1237		} else if (streamError.hasChild("host-unknown")) {
1238			throw new StreamErrorHostUnknown();
1239		} else if (streamError.hasChild("policy-violation")) {
1240			throw new StreamErrorPolicyViolation();
1241		} else {
1242			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1243			throw new StreamError();
1244		}
1245	}
1246
1247	private void sendStartStream() throws IOException {
1248		final Tag stream = Tag.start("stream:stream");
1249		stream.setAttribute("to", account.getServer().toString());
1250		stream.setAttribute("version", "1.0");
1251		stream.setAttribute("xml:lang", "en");
1252		stream.setAttribute("xmlns", "jabber:client");
1253		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1254		tagWriter.writeTag(stream);
1255	}
1256
1257	private String nextRandomId() {
1258		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(36);
1259	}
1260
1261	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1262		packet.setFrom(account.getJid());
1263		return this.sendUnmodifiedIqPacket(packet, callback);
1264	}
1265
1266	public synchronized String sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1267		if (packet.getId() == null) {
1268			final String id = nextRandomId();
1269			packet.setAttribute("id", id);
1270		}
1271		if (callback != null) {
1272			synchronized (this.packetCallbacks) {
1273				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1274			}
1275		}
1276		this.sendPacket(packet);
1277		return packet.getId();
1278	}
1279
1280	public void sendMessagePacket(final MessagePacket packet) {
1281		this.sendPacket(packet);
1282	}
1283
1284	public void sendPresencePacket(final PresencePacket packet) {
1285		this.sendPacket(packet);
1286	}
1287
1288	private synchronized void sendPacket(final AbstractStanza packet) {
1289		if (stanzasSent == Integer.MAX_VALUE) {
1290			resetStreamId();
1291			disconnect(true);
1292			return;
1293		}
1294		synchronized (this.mStanzaQueue) {
1295			tagWriter.writeStanzaAsync(packet);
1296			if (packet instanceof AbstractAcknowledgeableStanza) {
1297				AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1298				++stanzasSent;
1299				this.mStanzaQueue.append(stanzasSent, stanza);
1300				if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1301					if (Config.EXTENDED_SM_LOGGING) {
1302						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1303					}
1304					tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1305				}
1306			}
1307		}
1308	}
1309
1310	public void sendPing() {
1311		if (!r()) {
1312			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1313			iq.setFrom(account.getJid());
1314			iq.addChild("ping", "urn:xmpp:ping");
1315			this.sendIqPacket(iq, null);
1316		}
1317		this.lastPingSent = SystemClock.elapsedRealtime();
1318	}
1319
1320	public void setOnMessagePacketReceivedListener(
1321			final OnMessagePacketReceived listener) {
1322		this.messageListener = listener;
1323			}
1324
1325	public void setOnUnregisteredIqPacketReceivedListener(
1326			final OnIqPacketReceived listener) {
1327		this.unregisteredIqListener = listener;
1328			}
1329
1330	public void setOnPresencePacketReceivedListener(
1331			final OnPresencePacketReceived listener) {
1332		this.presenceListener = listener;
1333			}
1334
1335	public void setOnJinglePacketReceivedListener(
1336			final OnJinglePacketReceived listener) {
1337		this.jingleListener = listener;
1338			}
1339
1340	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1341		this.statusListener = listener;
1342	}
1343
1344	public void setOnBindListener(final OnBindListener listener) {
1345		this.bindListener = listener;
1346	}
1347
1348	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1349		this.acknowledgedListener = listener;
1350	}
1351
1352	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1353		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1354			this.advancedStreamFeaturesLoadedListeners.add(listener);
1355		}
1356	}
1357
1358	private void forceCloseSocket() {
1359		if (socket != null) {
1360			try {
1361				socket.close();
1362			} catch (IOException e) {
1363				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception "+e.getMessage()+" during force close");
1364			}
1365		} else {
1366			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": socket was null during force close");
1367		}
1368	}
1369
1370	public void interrupt() {
1371		Thread.currentThread().interrupt();
1372	}
1373
1374	public void disconnect(final boolean force) {
1375		interrupt();
1376		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1377		if (force) {
1378			forceCloseSocket();
1379		} else {
1380			if (tagWriter.isActive()) {
1381				tagWriter.finish();
1382				try {
1383					int i = 0;
1384					boolean warned = false;
1385					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1386						if (!warned) {
1387							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1388							warned = true;
1389						}
1390						try {
1391							Thread.sleep(200);
1392						} catch(InterruptedException e) {
1393							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": sleep interrupted");
1394						}
1395						i++;
1396					}
1397					if (warned) {
1398						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1399					}
1400					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1401					tagWriter.writeTag(Tag.end("stream:stream"));
1402				} catch (final IOException e) {
1403					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1404				} finally {
1405					forceCloseSocket();
1406				}
1407			}
1408		}
1409	}
1410
1411	public void resetStreamId() {
1412		this.streamId = null;
1413	}
1414
1415	private List<Entry<Jid, ServiceDiscoveryResult>> findDiscoItemsByFeature(final String feature) {
1416		synchronized (this.disco) {
1417			final List<Entry<Jid, ServiceDiscoveryResult>> items = new ArrayList<>();
1418			for (final Entry<Jid, ServiceDiscoveryResult> cursor : this.disco.entrySet()) {
1419				if (cursor.getValue().getFeatures().contains(feature)) {
1420					items.add(cursor);
1421				}
1422			}
1423			return items;
1424		}
1425	}
1426
1427	public Jid findDiscoItemByFeature(final String feature) {
1428		final List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(feature);
1429		if (items.size() >= 1) {
1430			return items.get(0).getKey();
1431		}
1432		return null;
1433	}
1434
1435	public boolean r() {
1436		if (getFeatures().sm()) {
1437			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1438			return true;
1439		} else {
1440			return false;
1441		}
1442	}
1443
1444	public String getMucServer() {
1445		synchronized (this.disco) {
1446			for (final Entry<Jid, ServiceDiscoveryResult> cursor : disco.entrySet()) {
1447				final ServiceDiscoveryResult value = cursor.getValue();
1448				if (value.getFeatures().contains("http://jabber.org/protocol/muc")
1449						&& !value.getFeatures().contains("jabber:iq:gateway")
1450						&& !value.hasIdentity("conference", "irc")) {
1451					return cursor.getKey().toString();
1452				}
1453			}
1454		}
1455		return null;
1456	}
1457
1458	public int getTimeToNextAttempt() {
1459		final int interval = Math.min((int) (25 * Math.pow(1.3, attempt)), 300);
1460		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1461		return interval - secondsSinceLast;
1462	}
1463
1464	public int getAttempt() {
1465		return this.attempt;
1466	}
1467
1468	public Features getFeatures() {
1469		return this.features;
1470	}
1471
1472	public long getLastSessionEstablished() {
1473		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1474		return System.currentTimeMillis() - diff;
1475	}
1476
1477	public long getLastConnect() {
1478		return this.lastConnect;
1479	}
1480
1481	public long getLastPingSent() {
1482		return this.lastPingSent;
1483	}
1484
1485	public long getLastDiscoStarted() {
1486		return this.lastDiscoStarted;
1487	}
1488	public long getLastPacketReceived() {
1489		return this.lastPacketReceived;
1490	}
1491
1492	public void sendActive() {
1493		this.sendPacket(new ActivePacket());
1494	}
1495
1496	public void sendInactive() {
1497		this.sendPacket(new InactivePacket());
1498	}
1499
1500	public void resetAttemptCount(boolean resetConnectTime) {
1501		this.attempt = 0;
1502		if (resetConnectTime) {
1503			this.lastConnect = 0;
1504		}
1505	}
1506
1507	public void setInteractive(boolean interactive) {
1508		this.mInteractive = interactive;
1509	}
1510
1511	public Identity getServerIdentity() {
1512		synchronized (this.disco) {
1513			ServiceDiscoveryResult result = disco.get(account.getJid().toDomainJid());
1514			if (result == null) {
1515				return Identity.UNKNOWN;
1516			}
1517			for (final ServiceDiscoveryResult.Identity id : result.getIdentities()) {
1518				if (id.getType().equals("im") && id.getCategory().equals("server") && id.getName() != null) {
1519					switch (id.getName()) {
1520						case "Prosody":
1521							return Identity.PROSODY;
1522						case "ejabberd":
1523							return Identity.EJABBERD;
1524						case "Slack-XMPP":
1525							return Identity.SLACK;
1526					}
1527				}
1528			}
1529		}
1530		return Identity.UNKNOWN;
1531	}
1532
1533	private class UnauthorizedException extends IOException {
1534
1535	}
1536
1537	private class SecurityException extends IOException {
1538
1539	}
1540
1541	private class IncompatibleServerException extends IOException {
1542
1543	}
1544
1545	private class StreamErrorHostUnknown extends StreamError {
1546
1547	}
1548
1549	private class StreamErrorPolicyViolation extends StreamError {
1550
1551	}
1552
1553	private class StreamError extends IOException {
1554
1555	}
1556
1557	private class PaymentRequiredException extends IOException {
1558
1559	}
1560
1561	private class RegistrationNotSupportedException extends IOException {
1562
1563	}
1564
1565	public enum Identity {
1566		FACEBOOK,
1567		SLACK,
1568		EJABBERD,
1569		PROSODY,
1570		NIMBUZZ,
1571		UNKNOWN
1572	}
1573
1574	public class Features {
1575		XmppConnection connection;
1576		private boolean carbonsEnabled = false;
1577		private boolean encryptionEnabled = false;
1578		private boolean blockListRequested = false;
1579
1580		public Features(final XmppConnection connection) {
1581			this.connection = connection;
1582		}
1583
1584		private boolean hasDiscoFeature(final Jid server, final String feature) {
1585			synchronized (XmppConnection.this.disco) {
1586				return connection.disco.containsKey(server) &&
1587						connection.disco.get(server).getFeatures().contains(feature);
1588			}
1589		}
1590
1591		public boolean carbons() {
1592			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1593		}
1594
1595		public boolean blocking() {
1596			return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1597		}
1598
1599		public boolean spamReporting() {
1600			return hasDiscoFeature(account.getServer(), "urn:xmpp:reporting:reason:spam:0");
1601		}
1602
1603		public boolean register() {
1604			return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1605		}
1606
1607		public boolean sm() {
1608			return streamId != null
1609					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1610		}
1611
1612		public boolean csi() {
1613			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1614		}
1615
1616		public boolean pep() {
1617			synchronized (XmppConnection.this.disco) {
1618				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1619				return info != null && info.hasIdentity("pubsub", "pep");
1620			}
1621		}
1622
1623		public boolean pepPersistent() {
1624			synchronized (XmppConnection.this.disco) {
1625				ServiceDiscoveryResult info = disco.get(account.getJid().toBareJid());
1626				return info != null && info.getFeatures().contains("http://jabber.org/protocol/pubsub#persistent-items");
1627			}
1628		}
1629
1630		public boolean mam() {
1631			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")
1632				|| hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1633		}
1634
1635		public boolean push() {
1636			return hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:push:0")
1637					|| hasDiscoFeature(account.getServer(), "urn:xmpp:push:0");
1638		}
1639
1640		public boolean rosterVersioning() {
1641			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1642		}
1643
1644		public void setBlockListRequested(boolean value) {
1645			this.blockListRequested = value;
1646		}
1647
1648		public boolean httpUpload(long filesize) {
1649			if (Config.DISABLE_HTTP_UPLOAD) {
1650				return false;
1651			} else {
1652				List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD);
1653				if (items.size() > 0) {
1654					try {
1655						long maxsize = Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Xmlns.HTTP_UPLOAD, "max-file-size"));
1656						if(filesize <= maxsize) {
1657							return true;
1658						} else {
1659							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": http upload is not available for files with size "+filesize+" (max is "+maxsize+")");
1660							return false;
1661						}
1662					} catch (Exception e) {
1663						return true;
1664					}
1665				} else {
1666					return false;
1667				}
1668			}
1669		}
1670
1671		public long getMaxHttpUploadSize() {
1672			List<Entry<Jid, ServiceDiscoveryResult>> items = findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD);
1673				if (items.size() > 0) {
1674					try {
1675						return Long.parseLong(items.get(0).getValue().getExtendedDiscoInformation(Xmlns.HTTP_UPLOAD, "max-file-size"));
1676					} catch (Exception e) {
1677						return -1;
1678					}
1679				} else {
1680					return -1;
1681				}
1682		}
1683
1684		public boolean stanzaIds() {
1685			return hasDiscoFeature(account.getJid().toBareJid(),Xmlns.STANZA_IDS);
1686		}
1687	}
1688
1689	private IqGenerator getIqGenerator() {
1690		return mXmppConnectionService.getIqGenerator();
1691	}
1692}