1package eu.siacs.conversations.xmpp;
   2
   3import android.content.Intent;
   4import android.graphics.Bitmap;
   5import android.graphics.BitmapFactory;
   6import android.net.wifi.WifiConfiguration;
   7import android.os.Bundle;
   8import android.os.Parcelable;
   9import android.os.PowerManager;
  10import android.os.PowerManager.WakeLock;
  11import android.os.SystemClock;
  12import android.util.Base64;
  13import android.util.Log;
  14import android.util.Pair;
  15import android.util.SparseArray;
  16
  17import org.apache.http.conn.ssl.StrictHostnameVerifier;
  18import org.json.JSONException;
  19import org.json.JSONObject;
  20import org.xmlpull.v1.XmlPullParserException;
  21
  22import java.io.ByteArrayInputStream;
  23import java.io.IOException;
  24import java.io.InputStream;
  25import java.io.OutputStream;
  26import java.math.BigInteger;
  27import java.net.ConnectException;
  28import java.net.IDN;
  29import java.net.InetAddress;
  30import java.net.InetSocketAddress;
  31import java.net.Socket;
  32import java.net.UnknownHostException;
  33import java.net.MalformedURLException;
  34import java.net.URL;
  35import java.security.KeyManagementException;
  36import java.security.NoSuchAlgorithmException;
  37import java.util.ArrayList;
  38import java.util.Arrays;
  39import java.util.Collection;
  40import java.util.HashMap;
  41import java.util.Hashtable;
  42import java.util.Iterator;
  43import java.util.LinkedList;
  44import java.util.List;
  45import java.util.Map.Entry;
  46
  47import javax.net.ssl.HostnameVerifier;
  48import javax.net.ssl.SSLContext;
  49import javax.net.ssl.SSLSocket;
  50import javax.net.ssl.SSLSocketFactory;
  51import javax.net.ssl.X509TrustManager;
  52
  53import de.duenndns.ssl.MemorizingTrustManager;
  54import eu.siacs.conversations.Config;
  55import eu.siacs.conversations.crypto.sasl.DigestMd5;
  56import eu.siacs.conversations.crypto.sasl.Plain;
  57import eu.siacs.conversations.crypto.sasl.SaslMechanism;
  58import eu.siacs.conversations.crypto.sasl.ScramSha1;
  59import eu.siacs.conversations.entities.Account;
  60import eu.siacs.conversations.entities.Message;
  61import eu.siacs.conversations.generator.IqGenerator;
  62import eu.siacs.conversations.services.XmppConnectionService;
  63import eu.siacs.conversations.utils.CryptoHelper;
  64import eu.siacs.conversations.utils.DNSHelper;
  65import eu.siacs.conversations.utils.Xmlns;
  66import eu.siacs.conversations.xml.Element;
  67import eu.siacs.conversations.xml.Tag;
  68import eu.siacs.conversations.xml.TagWriter;
  69import eu.siacs.conversations.xml.XmlReader;
  70import eu.siacs.conversations.xmpp.forms.Data;
  71import eu.siacs.conversations.xmpp.forms.Field;
  72import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  73import eu.siacs.conversations.xmpp.jid.Jid;
  74import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
  75import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
  76import eu.siacs.conversations.xmpp.stanzas.AbstractAcknowledgeableStanza;
  77import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
  78import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  79import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  80import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
  81import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
  82import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
  83import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
  84import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
  85import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
  86import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
  87
  88public class XmppConnection implements Runnable {
  89
  90	private static final int PACKET_IQ = 0;
  91	private static final int PACKET_MESSAGE = 1;
  92	private static final int PACKET_PRESENCE = 2;
  93	protected Account account;
  94	private final WakeLock wakeLock;
  95	private Socket socket;
  96	private XmlReader tagReader;
  97	private TagWriter tagWriter;
  98	private final Features features = new Features(this);
  99	private boolean needsBinding = true;
 100	private boolean shouldAuthenticate = true;
 101	private Element streamFeatures;
 102	private final HashMap<Jid, Info> disco = new HashMap<>();
 103
 104	private String streamId = null;
 105	private int smVersion = 3;
 106	private final SparseArray<AbstractAcknowledgeableStanza> mStanzaQueue = new SparseArray<>();
 107
 108	private int stanzasReceived = 0;
 109	private int stanzasSent = 0;
 110	private long lastPacketReceived = 0;
 111	private long lastPingSent = 0;
 112	private long lastConnect = 0;
 113	private long lastSessionStarted = 0;
 114	private boolean mInteractive = false;
 115	private int attempt = 0;
 116	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 117	private OnPresencePacketReceived presenceListener = null;
 118	private OnJinglePacketReceived jingleListener = null;
 119	private OnIqPacketReceived unregisteredIqListener = null;
 120	private OnMessagePacketReceived messageListener = null;
 121	private OnStatusChanged statusListener = null;
 122	private OnBindListener bindListener = null;
 123	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 124	private OnMessageAcknowledged acknowledgedListener = null;
 125	private XmppConnectionService mXmppConnectionService = null;
 126
 127	private SaslMechanism saslMechanism;
 128
 129	private OnIqPacketReceived createPacketReceiveHandler() {
 130		OnIqPacketReceived receiver = new OnIqPacketReceived() {
 131			@Override
 132			public void onIqPacketReceived(Account account, IqPacket packet) {
 133				if (packet.getType() == IqPacket.TYPE.RESULT) {
 134					account.setOption(Account.OPTION_REGISTER,
 135							false);
 136					changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 137				} else if (packet.hasChild("error")
 138						&& (packet.findChild("error")
 139						.hasChild("conflict"))) {
 140					changeStatus(Account.State.REGISTRATION_CONFLICT);
 141				} else {
 142					changeStatus(Account.State.REGISTRATION_FAILED);
 143					Log.d(Config.LOGTAG, packet.toString());
 144				}
 145				disconnect(true);
 146			}
 147		};
 148
 149		return receiver;
 150	}
 151
 152	public XmppConnection(final Account account, final XmppConnectionService service) {
 153		this.account = account;
 154		this.wakeLock = service.getPowerManager().newWakeLock(
 155				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 156		tagWriter = new TagWriter();
 157		mXmppConnectionService = service;
 158	}
 159
 160	protected void changeStatus(final Account.State nextStatus) {
 161		if (account.getStatus() != nextStatus) {
 162			if ((nextStatus == Account.State.OFFLINE)
 163					&& (account.getStatus() != Account.State.CONNECTING)
 164					&& (account.getStatus() != Account.State.ONLINE)
 165					&& (account.getStatus() != Account.State.DISABLED)) {
 166				return;
 167					}
 168			if (nextStatus == Account.State.ONLINE) {
 169				this.attempt = 0;
 170			}
 171			account.setStatus(nextStatus);
 172			if (statusListener != null) {
 173				statusListener.onStatusChanged(account);
 174			}
 175		}
 176	}
 177
 178	protected void connect() {
 179		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 180		features.encryptionEnabled = false;
 181		lastConnect = SystemClock.elapsedRealtime();
 182		lastPingSent = SystemClock.elapsedRealtime();
 183		this.attempt++;
 184		try {
 185			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 186			tagReader = new XmlReader(wakeLock);
 187			tagWriter = new TagWriter();
 188			this.changeStatus(Account.State.CONNECTING);
 189			if (DNSHelper.isIp(account.getServer().toString())) {
 190				socket = new Socket();
 191				try {
 192					socket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 193				} catch (IOException e) {
 194					throw new UnknownHostException();
 195				}
 196			} else {
 197				final Bundle result = DNSHelper.getSRVRecord(account.getServer(),mXmppConnectionService);
 198				final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
 199				int i = 0;
 200				boolean socketError = true;
 201				while (socketError && values.size() > i) {
 202					final Bundle namePort = (Bundle) values.get(i);
 203					try {
 204						String srvRecordServer;
 205						try {
 206							srvRecordServer = IDN.toASCII(namePort.getString("name"));
 207						} catch (final IllegalArgumentException e) {
 208							// TODO: Handle me?`
 209							srvRecordServer = "";
 210						}
 211						final int srvRecordPort = namePort.getInt("port");
 212						final String srvIpServer = namePort.getString("ip");
 213						final InetSocketAddress addr;
 214						if (srvIpServer != null) {
 215							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
 216							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 217									+ ": using values from dns " + srvRecordServer
 218									+ "[" + srvIpServer + "]:" + srvRecordPort);
 219						} else {
 220							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
 221							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 222									+ ": using values from dns "
 223									+ srvRecordServer + ":" + srvRecordPort);
 224						}
 225						socket = new Socket();
 226						socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 227						socketError = false;
 228					} catch (final Throwable e) {
 229						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 230						i++;
 231					}
 232				}
 233				if (socketError) {
 234					throw new UnknownHostException();
 235				}
 236			}
 237			final OutputStream out = socket.getOutputStream();
 238			tagWriter.setOutputStream(out);
 239			final InputStream in = socket.getInputStream();
 240			tagReader.setInputStream(in);
 241			tagWriter.beginDocument();
 242			sendStartStream();
 243			Tag nextTag;
 244			while ((nextTag = tagReader.readTag()) != null) {
 245				if (nextTag.isStart("stream")) {
 246					processStream(nextTag);
 247					break;
 248				} else {
 249					throw new IOException("unknown tag on connect");
 250				}
 251			}
 252			if (socket.isConnected()) {
 253				socket.close();
 254			}
 255		} catch (final IncompatibleServerException e) {
 256			this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
 257		} catch (final SecurityException e) {
 258			this.changeStatus(Account.State.SECURITY_ERROR);
 259		} catch (final UnauthorizedException e) {
 260			this.changeStatus(Account.State.UNAUTHORIZED);
 261		} catch (final UnknownHostException | ConnectException e) {
 262			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 263		} catch (final DnsTimeoutException e) {
 264			this.changeStatus(Account.State.DNS_TIMEOUT);
 265		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 266			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 267			this.changeStatus(Account.State.OFFLINE);
 268			this.attempt--; //don't count attempt when reconnecting instantly anyway
 269		} finally {
 270			if (socket != null) {
 271				try {
 272					socket.close();
 273				} catch (IOException e) {
 274
 275				}
 276			}
 277			if (wakeLock.isHeld()) {
 278				try {
 279					wakeLock.release();
 280				} catch (final RuntimeException ignored) {
 281				}
 282			}
 283		}
 284	}
 285
 286	@Override
 287	public void run() {
 288		try {
 289			if (socket != null) {
 290				socket.close();
 291			}
 292		} catch (final IOException ignored) {
 293
 294		}
 295		connect();
 296	}
 297
 298	private void processStream(final Tag currentTag) throws XmlPullParserException,
 299					IOException, NoSuchAlgorithmException {
 300						Tag nextTag = tagReader.readTag();
 301
 302						while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
 303							if (nextTag.isStart("error")) {
 304								processStreamError(nextTag);
 305							} else if (nextTag.isStart("features")) {
 306								processStreamFeatures(nextTag);
 307							} else if (nextTag.isStart("proceed")) {
 308								switchOverToTls(nextTag);
 309							} else if (nextTag.isStart("success")) {
 310								final String challenge = tagReader.readElement(nextTag).getContent();
 311								try {
 312									saslMechanism.getResponse(challenge);
 313								} catch (final SaslMechanism.AuthenticationException e) {
 314									disconnect(true);
 315									Log.e(Config.LOGTAG, String.valueOf(e));
 316								}
 317								Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 318								account.setKey(Account.PINNED_MECHANISM_KEY,
 319										String.valueOf(saslMechanism.getPriority()));
 320								tagReader.reset();
 321								sendStartStream();
 322								processStream(tagReader.readTag());
 323								break;
 324							} else if (nextTag.isStart("failure")) {
 325								throw new UnauthorizedException();
 326							} else if (nextTag.isStart("challenge")) {
 327								final String challenge = tagReader.readElement(nextTag).getContent();
 328								final Element response = new Element("response");
 329								response.setAttribute("xmlns",
 330										"urn:ietf:params:xml:ns:xmpp-sasl");
 331								try {
 332									response.setContent(saslMechanism.getResponse(challenge));
 333								} catch (final SaslMechanism.AuthenticationException e) {
 334									// TODO: Send auth abort tag.
 335									Log.e(Config.LOGTAG, e.toString());
 336								}
 337								tagWriter.writeElement(response);
 338							} else if (nextTag.isStart("enabled")) {
 339								final Element enabled = tagReader.readElement(nextTag);
 340								if ("true".equals(enabled.getAttribute("resume"))) {
 341									this.streamId = enabled.getAttribute("id");
 342									Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 343											+ ": stream managment(" + smVersion
 344											+ ") enabled (resumable)");
 345								} else {
 346									Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 347											+ ": stream management(" + smVersion + ") enabled");
 348								}
 349								this.stanzasReceived = 0;
 350								final RequestPacket r = new RequestPacket(smVersion);
 351								tagWriter.writeStanzaAsync(r);
 352							} else if (nextTag.isStart("resumed")) {
 353								lastPacketReceived = SystemClock.elapsedRealtime();
 354								final Element resumed = tagReader.readElement(nextTag);
 355								final String h = resumed.getAttribute("h");
 356								try {
 357									final int serverCount = Integer.parseInt(h);
 358									if (serverCount != stanzasSent) {
 359										Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 360												+ ": session resumed with lost packages");
 361										stanzasSent = serverCount;
 362									} else {
 363										Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 364									}
 365									acknowledgeStanzaUpTo(serverCount);
 366									ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 367									for(int i = 0; i < this.mStanzaQueue.size(); ++i) {
 368										failedStanzas.add(mStanzaQueue.valueAt(i));
 369									}
 370									mStanzaQueue.clear();
 371									Log.d(Config.LOGTAG,"resending "+failedStanzas.size()+" stanzas");
 372									for(AbstractAcknowledgeableStanza packet : failedStanzas) {
 373										if (packet instanceof MessagePacket) {
 374											MessagePacket message = (MessagePacket) packet;
 375											mXmppConnectionService.markMessage(account,
 376													message.getTo().toBareJid(),
 377													message.getId(),
 378													Message.STATUS_UNSEND);
 379										}
 380										sendPacket(packet);
 381									}
 382								} catch (final NumberFormatException ignored) {
 383								}
 384								Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 385								changeStatus(Account.State.ONLINE);
 386							} else if (nextTag.isStart("r")) {
 387								tagReader.readElement(nextTag);
 388								if (Config.EXTENDED_SM_LOGGING) {
 389									Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 390								}
 391								final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 392								tagWriter.writeStanzaAsync(ack);
 393							} else if (nextTag.isStart("a")) {
 394								final Element ack = tagReader.readElement(nextTag);
 395								lastPacketReceived = SystemClock.elapsedRealtime();
 396								try {
 397									final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 398									acknowledgeStanzaUpTo(serverSequence);
 399								} catch (NumberFormatException e) {
 400									Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 401								}
 402							} else if (nextTag.isStart("failed")) {
 403								tagReader.readElement(nextTag);
 404								Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
 405								streamId = null;
 406								if (account.getStatus() != Account.State.ONLINE) {
 407									sendBindRequest();
 408								}
 409							} else if (nextTag.isStart("iq")) {
 410								processIq(nextTag);
 411							} else if (nextTag.isStart("message")) {
 412								processMessage(nextTag);
 413							} else if (nextTag.isStart("presence")) {
 414								processPresence(nextTag);
 415							}
 416							nextTag = tagReader.readTag();
 417						}
 418						if (account.getStatus() == Account.State.ONLINE) {
 419							account. setStatus(Account.State.OFFLINE);
 420							if (statusListener != null) {
 421								statusListener.onStatusChanged(account);
 422							}
 423						}
 424	}
 425
 426	private void acknowledgeStanzaUpTo(int serverCount) {
 427		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 428			if (serverCount >= mStanzaQueue.keyAt(i)) {
 429				if (Config.EXTENDED_SM_LOGGING) {
 430					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 431				}
 432				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 433				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 434					MessagePacket packet = (MessagePacket) stanza;
 435					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 436				}
 437				mStanzaQueue.removeAt(i);
 438				i--;
 439			}
 440		}
 441	}
 442
 443	private Element processPacket(final Tag currentTag, final int packetType)
 444		throws XmlPullParserException, IOException {
 445		Element element;
 446		switch (packetType) {
 447			case PACKET_IQ:
 448				element = new IqPacket();
 449				break;
 450			case PACKET_MESSAGE:
 451				element = new MessagePacket();
 452				break;
 453			case PACKET_PRESENCE:
 454				element = new PresencePacket();
 455				break;
 456			default:
 457				return null;
 458		}
 459		element.setAttributes(currentTag.getAttributes());
 460		Tag nextTag = tagReader.readTag();
 461		if (nextTag == null) {
 462			throw new IOException("interrupted mid tag");
 463		}
 464		while (!nextTag.isEnd(element.getName())) {
 465			if (!nextTag.isNo()) {
 466				final Element child = tagReader.readElement(nextTag);
 467				final String type = currentTag.getAttribute("type");
 468				if (packetType == PACKET_IQ
 469						&& "jingle".equals(child.getName())
 470						&& ("set".equalsIgnoreCase(type) || "get"
 471							.equalsIgnoreCase(type))) {
 472					element = new JinglePacket();
 473					element.setAttributes(currentTag.getAttributes());
 474							}
 475				element.addChild(child);
 476			}
 477			nextTag = tagReader.readTag();
 478			if (nextTag == null) {
 479				throw new IOException("interrupted mid tag");
 480			}
 481		}
 482		if (stanzasReceived == Integer.MAX_VALUE) {
 483			resetStreamId();
 484			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 485		}
 486		++stanzasReceived;
 487		lastPacketReceived = SystemClock.elapsedRealtime();
 488		return element;
 489	}
 490
 491	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 492		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 493
 494		if (packet.getId() == null) {
 495			return; // an iq packet without id is definitely invalid
 496		}
 497
 498		if (packet instanceof JinglePacket) {
 499			if (this.jingleListener != null) {
 500				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 501			}
 502		} else {
 503			OnIqPacketReceived callback = null;
 504			synchronized (this.packetCallbacks) {
 505				if (packetCallbacks.containsKey(packet.getId())) {
 506					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 507					// Packets to the server should have responses from the server
 508					if (packetCallbackDuple.first.toServer(account)) {
 509						if (packet.fromServer(account) || account.getJid().getDomainpart().equals("chat.facebook.com")) {
 510							callback = packetCallbackDuple.second;
 511							packetCallbacks.remove(packet.getId());
 512						} else {
 513							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 514						}
 515					} else {
 516						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 517							callback = packetCallbackDuple.second;
 518							packetCallbacks.remove(packet.getId());
 519						} else {
 520							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 521						}
 522					}
 523				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 524					callback = this.unregisteredIqListener;
 525				}
 526			}
 527			if (callback != null) {
 528				callback.onIqPacketReceived(account,packet);
 529			}
 530		}
 531	}
 532
 533	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 534		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 535		this.messageListener.onMessagePacketReceived(account, packet);
 536	}
 537
 538	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 539		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 540		this.presenceListener.onPresencePacketReceived(account, packet);
 541	}
 542
 543	private void sendStartTLS() throws IOException {
 544		final Tag startTLS = Tag.empty("starttls");
 545		startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
 546		tagWriter.writeTag(startTLS);
 547	}
 548
 549	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 550		tagReader.readTag();
 551		try {
 552			final SSLContext sc = SSLContext.getInstance("TLS");
 553			MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 554			sc.init(null,new X509TrustManager[]{mInteractive ? trustManager : trustManager.getNonInteractive()},mXmppConnectionService.getRNG());
 555			final SSLSocketFactory factory = sc.getSocketFactory();
 556			final HostnameVerifier verifier;
 557			if (mInteractive) {
 558				verifier = trustManager.wrapHostnameVerifier(new StrictHostnameVerifier());
 559			} else {
 560				verifier = trustManager.wrapHostnameVerifierNonInteractive(new StrictHostnameVerifier());
 561			}
 562			final InetAddress address = socket == null ? null : socket.getInetAddress();
 563
 564			if (factory == null || address == null || verifier == null) {
 565				throw new IOException("could not setup ssl");
 566			}
 567
 568			final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
 569
 570			if (sslSocket == null) {
 571				throw new IOException("could not initialize ssl socket");
 572			}
 573
 574			final String[] supportProtocols;
 575			final Collection<String> supportedProtocols = new LinkedList<>(
 576					Arrays.asList(sslSocket.getSupportedProtocols()));
 577			supportedProtocols.remove("SSLv3");
 578			supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
 579
 580			sslSocket.setEnabledProtocols(supportProtocols);
 581
 582			final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
 583					sslSocket.getSupportedCipherSuites());
 584			//Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
 585			if (cipherSuites.length > 0) {
 586				sslSocket.setEnabledCipherSuites(cipherSuites);
 587			}
 588
 589			if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
 590				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 591				throw new SecurityException();
 592			}
 593			tagReader.setInputStream(sslSocket.getInputStream());
 594			tagWriter.setOutputStream(sslSocket.getOutputStream());
 595			sendStartStream();
 596			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 597			features.encryptionEnabled = true;
 598			processStream(tagReader.readTag());
 599			sslSocket.close();
 600		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 601			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 602			throw new SecurityException();
 603		}
 604	}
 605
 606	private void processStreamFeatures(final Tag currentTag)
 607		throws XmlPullParserException, IOException {
 608		this.streamFeatures = tagReader.readElement(currentTag);
 609		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 610			sendStartTLS();
 611		} else if (this.streamFeatures.hasChild("register")
 612				&& account.isOptionSet(Account.OPTION_REGISTER)
 613				&& features.encryptionEnabled) {
 614			sendRegistryRequest();
 615		} else if (!this.streamFeatures.hasChild("register")
 616				&& account.isOptionSet(Account.OPTION_REGISTER)) {
 617			changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
 618			disconnect(true);
 619		} else if (this.streamFeatures.hasChild("mechanisms")
 620				&& shouldAuthenticate && features.encryptionEnabled) {
 621			final List<String> mechanisms = extractMechanisms(streamFeatures
 622					.findChild("mechanisms"));
 623			final Element auth = new Element("auth");
 624			auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
 625			if (mechanisms.contains("SCRAM-SHA-1")) {
 626				saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 627			} else if (mechanisms.contains("PLAIN")) {
 628				saslMechanism = new Plain(tagWriter, account);
 629			} else if (mechanisms.contains("DIGEST-MD5")) {
 630				saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 631			}
 632			if (saslMechanism != null) {
 633				final JSONObject keys = account.getKeys();
 634				try {
 635					if (keys.has(Account.PINNED_MECHANISM_KEY) &&
 636							keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
 637						Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 638								" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 639								") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
 640								"). Possible downgrade attack?");
 641						throw new SecurityException();
 642					}
 643				} catch (final JSONException e) {
 644					Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
 645				}
 646				Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 647				auth.setAttribute("mechanism", saslMechanism.getMechanism());
 648				if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 649					auth.setContent(saslMechanism.getClientFirstMessage());
 650				}
 651				tagWriter.writeElement(auth);
 652			} else {
 653				throw new IncompatibleServerException();
 654			}
 655		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 656			if (Config.EXTENDED_SM_LOGGING) {
 657				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 658			}
 659			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 660			this.tagWriter.writeStanzaAsync(resume);
 661		} else if (needsBinding) {
 662			if (this.streamFeatures.hasChild("bind")) {
 663				sendBindRequest();
 664			} else {
 665				throw new IncompatibleServerException();
 666			}
 667		}
 668	}
 669
 670	private List<String> extractMechanisms(final Element stream) {
 671		final ArrayList<String> mechanisms = new ArrayList<>(stream
 672				.getChildren().size());
 673		for (final Element child : stream.getChildren()) {
 674			mechanisms.add(child.getContent());
 675		}
 676		return mechanisms;
 677	}
 678
 679	public void sendCaptchaRegistryRequest(String id, Data data) {
 680		if (data == null) {
 681			setAccountCreationFailed("");
 682		} else {
 683			IqPacket request = getIqGenerator().generateCreateAccountWithCaptcha(account, id, data);
 684			sendIqPacket(request, createPacketReceiveHandler());
 685		}
 686	}
 687
 688	private void sendRegistryRequest() {
 689		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 690		register.query("jabber:iq:register");
 691		register.setTo(account.getServer());
 692		sendIqPacket(register, new OnIqPacketReceived() {
 693
 694			@Override
 695			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 696				boolean failed = false;
 697				if (packet.getType() == IqPacket.TYPE.RESULT
 698						&& packet.query().hasChild("username")
 699						&& (packet.query().hasChild("password"))) {
 700					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 701					final Element username = new Element("username").setContent(account.getUsername());
 702					final Element password = new Element("password").setContent(account.getPassword());
 703					register.query("jabber:iq:register").addChild(username);
 704					register.query().addChild(password);
 705					sendIqPacket(register, createPacketReceiveHandler());
 706				} else if (packet.getType() == IqPacket.TYPE.RESULT
 707						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 708					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 709					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 710					final String id = packet.getId();
 711
 712					Bitmap captcha = null;
 713					if (blob != null) {
 714						try {
 715							final String base64Blob = blob.getContent();
 716							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 717							InputStream stream = new ByteArrayInputStream(strBlob);
 718							captcha = BitmapFactory.decodeStream(stream);
 719						} catch (Exception e) {
 720
 721						}
 722					} else {
 723						try {
 724							Field url = data.getFieldByName("url");
 725							String urlString = url.findChildContent("value");
 726
 727							URL uri = new URL(urlString);
 728							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 729						} catch(MalformedURLException e) {
 730							Log.e(Config.LOGTAG, e.toString());
 731						} catch(IOException e) {
 732							Log.e(Config.LOGTAG, e.toString());
 733						}
 734					}
 735
 736					if (captcha != null) {
 737						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 738					}
 739				} else {
 740					failed = true;
 741				}
 742
 743				if (failed) {
 744					final Element instructions = packet.query().findChild("instructions");
 745					setAccountCreationFailed((instructions != null) ? instructions.getContent() : "");
 746				}
 747			}
 748		});
 749	}
 750
 751	private void setAccountCreationFailed(String instructions) {
 752		changeStatus(Account.State.REGISTRATION_FAILED);
 753		disconnect(true);
 754		Log.d(Config.LOGTAG, account.getJid().toBareJid()
 755				+ ": could not register. instructions are"
 756				+ instructions);
 757	}
 758
 759	private void sendBindRequest() {
 760		while(!mXmppConnectionService.areMessagesInitialized()) {
 761			try {
 762				Thread.sleep(500);
 763			} catch (final InterruptedException ignored) {
 764			}
 765		}
 766		needsBinding = false;
 767		clearIqCallbacks();
 768		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
 769		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
 770				.addChild("resource").setContent(account.getResource());
 771		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
 772			@Override
 773			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 774				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 775					return;
 776				}
 777				final Element bind = packet.findChild("bind");
 778				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
 779					final Element jid = bind.findChild("jid");
 780					if (jid != null && jid.getContent() != null) {
 781						try {
 782							account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
 783						} catch (final InvalidJidException e) {
 784							// TODO: Handle the case where an external JID is technically invalid?
 785						}
 786						if (streamFeatures.hasChild("session")) {
 787							sendStartSession();
 788						} else {
 789							sendPostBindInitialization();
 790						}
 791					} else {
 792						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure");
 793						disconnect(true);
 794					}
 795				} else {
 796					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure");
 797					disconnect(true);
 798				}
 799			}
 800		});
 801	}
 802
 803	private void clearIqCallbacks() {
 804		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
 805		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
 806		synchronized (this.packetCallbacks) {
 807			if (this.packetCallbacks.size() == 0) {
 808				return;
 809			}
 810			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
 811			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
 812			while (iterator.hasNext()) {
 813				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
 814				callbacks.add(entry.second);
 815				iterator.remove();
 816			}
 817		}
 818		for(OnIqPacketReceived callback : callbacks) {
 819			callback.onIqPacketReceived(account,failurePacket);
 820		}
 821		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
 822	}
 823
 824	private void sendStartSession() {
 825		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
 826		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
 827		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
 828			@Override
 829			public void onIqPacketReceived(Account account, IqPacket packet) {
 830				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 831					return;
 832				} else if (packet.getType() == IqPacket.TYPE.RESULT) {
 833					sendPostBindInitialization();
 834				} else {
 835					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not init sessions");
 836					disconnect(true);
 837				}
 838			}
 839		});
 840	}
 841
 842	private void sendPostBindInitialization() {
 843		smVersion = 0;
 844		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
 845			smVersion = 3;
 846		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
 847			smVersion = 2;
 848		}
 849		if (smVersion != 0) {
 850			final EnablePacket enable = new EnablePacket(smVersion);
 851			tagWriter.writeStanzaAsync(enable);
 852			stanzasSent = 0;
 853			mStanzaQueue.clear();
 854		}
 855		features.carbonsEnabled = false;
 856		features.blockListRequested = false;
 857		disco.clear();
 858		sendServiceDiscoveryInfo(account.getServer());
 859		sendServiceDiscoveryInfo(account.getJid().toBareJid());
 860		sendServiceDiscoveryItems(account.getServer());
 861		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
 862		this.lastSessionStarted = SystemClock.elapsedRealtime();
 863		changeStatus(Account.State.ONLINE);
 864		if (bindListener != null) {
 865			bindListener.onBind(account);
 866		}
 867	}
 868
 869	private void sendServiceDiscoveryInfo(final Jid jid) {
 870		if (disco.containsKey(jid)) {
 871			if (account.getServer().equals(jid)) {
 872				enableAdvancedStreamFeatures();
 873			}
 874		} else {
 875			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
 876			iq.setTo(jid);
 877			iq.query("http://jabber.org/protocol/disco#info");
 878			this.sendIqPacket(iq, new OnIqPacketReceived() {
 879
 880				@Override
 881				public void onIqPacketReceived(final Account account, final IqPacket packet) {
 882					if (packet.getType() == IqPacket.TYPE.RESULT) {
 883						final List<Element> elements = packet.query().getChildren();
 884						final Info info = new Info();
 885						for (final Element element : elements) {
 886							if (element.getName().equals("identity")) {
 887								String type = element.getAttribute("type");
 888								String category = element.getAttribute("category");
 889								if (type != null && category != null) {
 890									info.identities.add(new Pair<>(category, type));
 891								}
 892							} else if (element.getName().equals("feature")) {
 893								info.features.add(element.getAttribute("var"));
 894							}
 895						}
 896						disco.put(jid, info);
 897						if (account.getServer().equals(jid)) {
 898							enableAdvancedStreamFeatures();
 899							for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
 900								listener.onAdvancedStreamFeaturesAvailable(account);
 901							}
 902						}
 903					} else {
 904						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": could not query disco info for "+jid.toString());
 905					}
 906				}
 907			});
 908		}
 909	}
 910
 911	private void enableAdvancedStreamFeatures() {
 912		if (getFeatures().carbons() && !features.carbonsEnabled) {
 913			sendEnableCarbons();
 914		}
 915		if (getFeatures().blocking() && !features.blockListRequested) {
 916			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
 917			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
 918		}
 919	}
 920
 921	private void sendServiceDiscoveryItems(final Jid server) {
 922		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
 923		iq.setTo(server.toDomainJid());
 924		iq.query("http://jabber.org/protocol/disco#items");
 925		this.sendIqPacket(iq, new OnIqPacketReceived() {
 926
 927			@Override
 928			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 929				if (packet.getType() == IqPacket.TYPE.RESULT) {
 930					final List<Element> elements = packet.query().getChildren();
 931					for (final Element element : elements) {
 932						if (element.getName().equals("item")) {
 933							final Jid jid = element.getAttributeAsJid("jid");
 934							if (jid != null && !jid.equals(account.getServer())) {
 935								sendServiceDiscoveryInfo(jid);
 936							}
 937						}
 938					}
 939				} else {
 940					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": could not query disco items of "+server);
 941				}
 942			}
 943		});
 944	}
 945
 946	private void sendEnableCarbons() {
 947		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
 948		iq.addChild("enable", "urn:xmpp:carbons:2");
 949		this.sendIqPacket(iq, new OnIqPacketReceived() {
 950
 951			@Override
 952			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 953				if (!packet.hasChild("error")) {
 954					Log.d(Config.LOGTAG, account.getJid().toBareJid()
 955							+ ": successfully enabled carbons");
 956					features.carbonsEnabled = true;
 957				} else {
 958					Log.d(Config.LOGTAG, account.getJid().toBareJid()
 959							+ ": error enableing carbons " + packet.toString());
 960				}
 961			}
 962		});
 963	}
 964
 965	private void processStreamError(final Tag currentTag)
 966		throws XmlPullParserException, IOException {
 967		final Element streamError = tagReader.readElement(currentTag);
 968		if (streamError != null && streamError.hasChild("conflict")) {
 969			final String resource = account.getResource().split("\\.")[0];
 970			account.setResource(resource + "." + nextRandomId());
 971			Log.d(Config.LOGTAG,
 972					account.getJid().toBareJid() + ": switching resource due to conflict ("
 973					+ account.getResource() + ")");
 974		} else if (streamError != null) {
 975			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
 976		}
 977	}
 978
 979	private void sendStartStream() throws IOException {
 980		final Tag stream = Tag.start("stream:stream");
 981		stream.setAttribute("to", account.getServer().toString());
 982		stream.setAttribute("version", "1.0");
 983		stream.setAttribute("xml:lang", "en");
 984		stream.setAttribute("xmlns", "jabber:client");
 985		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
 986		tagWriter.writeTag(stream);
 987	}
 988
 989	private String nextRandomId() {
 990		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
 991	}
 992
 993	public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
 994		packet.setFrom(account.getJid());
 995		this.sendUnmodifiedIqPacket(packet, callback);
 996
 997	}
 998
 999	private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1000		if (packet.getId() == null) {
1001			final String id = nextRandomId();
1002			packet.setAttribute("id", id);
1003		}
1004		if (callback != null) {
1005			synchronized (this.packetCallbacks) {
1006				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1007			}
1008		}
1009		this.sendPacket(packet);
1010	}
1011
1012	public void sendMessagePacket(final MessagePacket packet) {
1013		this.sendPacket(packet);
1014	}
1015
1016	public void sendPresencePacket(final PresencePacket packet) {
1017		this.sendPacket(packet);
1018	}
1019
1020	private synchronized void sendPacket(final AbstractStanza packet) {
1021		if (stanzasSent == Integer.MAX_VALUE) {
1022			resetStreamId();
1023			disconnect(true);
1024			return;
1025		}
1026		tagWriter.writeStanzaAsync(packet);
1027		if (packet instanceof AbstractAcknowledgeableStanza) {
1028			AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1029			++stanzasSent;
1030			this.mStanzaQueue.put(stanzasSent, stanza);
1031			if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1032				if (Config.EXTENDED_SM_LOGGING) {
1033					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1034				}
1035				tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1036			}
1037		}
1038	}
1039
1040	public void sendPing() {
1041		if (!r()) {
1042			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1043			iq.setFrom(account.getJid());
1044			iq.addChild("ping", "urn:xmpp:ping");
1045			this.sendIqPacket(iq, null);
1046		}
1047		this.lastPingSent = SystemClock.elapsedRealtime();
1048	}
1049
1050	public void setOnMessagePacketReceivedListener(
1051			final OnMessagePacketReceived listener) {
1052		this.messageListener = listener;
1053			}
1054
1055	public void setOnUnregisteredIqPacketReceivedListener(
1056			final OnIqPacketReceived listener) {
1057		this.unregisteredIqListener = listener;
1058			}
1059
1060	public void setOnPresencePacketReceivedListener(
1061			final OnPresencePacketReceived listener) {
1062		this.presenceListener = listener;
1063			}
1064
1065	public void setOnJinglePacketReceivedListener(
1066			final OnJinglePacketReceived listener) {
1067		this.jingleListener = listener;
1068			}
1069
1070	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1071		this.statusListener = listener;
1072	}
1073
1074	public void setOnBindListener(final OnBindListener listener) {
1075		this.bindListener = listener;
1076	}
1077
1078	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1079		this.acknowledgedListener = listener;
1080	}
1081
1082	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1083		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1084			this.advancedStreamFeaturesLoadedListeners.add(listener);
1085		}
1086	}
1087
1088	public void disconnect(final boolean force) {
1089		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
1090		try {
1091			if (force) {
1092				socket.close();
1093				return;
1094			}
1095			new Thread(new Runnable() {
1096
1097				@Override
1098				public void run() {
1099					if (tagWriter.isActive()) {
1100						tagWriter.finish();
1101						try {
1102							int i = 0;
1103							boolean warned = false;
1104							while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1105								if (!warned) {
1106									Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1107									warned = true;
1108								}
1109								Thread.sleep(200);
1110								i++;
1111							}
1112							if (warned) {
1113								Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1114							}
1115							tagWriter.writeTag(Tag.end("stream:stream"));
1116							socket.close();
1117						} catch (final IOException e) {
1118							Log.d(Config.LOGTAG,"io exception during disconnect");
1119						} catch (final InterruptedException e) {
1120							Log.d(Config.LOGTAG, "interrupted");
1121						}
1122					}
1123				}
1124			}).start();
1125		} catch (final IOException e) {
1126			Log.d(Config.LOGTAG, "io exception during disconnect");
1127		}
1128	}
1129
1130	public void resetStreamId() {
1131		this.streamId = null;
1132	}
1133
1134	public List<Jid> findDiscoItemsByFeature(final String feature) {
1135		final List<Jid> items = new ArrayList<>();
1136		for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1137			if (cursor.getValue().features.contains(feature)) {
1138				items.add(cursor.getKey());
1139			}
1140		}
1141		return items;
1142	}
1143
1144	public Jid findDiscoItemByFeature(final String feature) {
1145		final List<Jid> items = findDiscoItemsByFeature(feature);
1146		if (items.size() >= 1) {
1147			return items.get(0);
1148		}
1149		return null;
1150	}
1151
1152	public boolean r() {
1153		if (getFeatures().sm()) {
1154			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1155			return true;
1156		} else {
1157			return false;
1158		}
1159	}
1160
1161	public String getMucServer() {
1162		for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1163			final Info value = cursor.getValue();
1164			if (value.features.contains("http://jabber.org/protocol/muc")
1165					&& !value.features.contains("jabber:iq:gateway")
1166					&& !value.identities.contains(new Pair<>("conference","irc"))) {
1167				return cursor.getKey().toString();
1168			}
1169		}
1170		return null;
1171	}
1172
1173	public int getTimeToNextAttempt() {
1174		final int interval = (int) (25 * Math.pow(1.5, attempt));
1175		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1176		return interval - secondsSinceLast;
1177	}
1178
1179	public int getAttempt() {
1180		return this.attempt;
1181	}
1182
1183	public Features getFeatures() {
1184		return this.features;
1185	}
1186
1187	public long getLastSessionEstablished() {
1188		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1189		return System.currentTimeMillis() - diff;
1190	}
1191
1192	public long getLastConnect() {
1193		return this.lastConnect;
1194	}
1195
1196	public long getLastPingSent() {
1197		return this.lastPingSent;
1198	}
1199
1200	public long getLastPacketReceived() {
1201		return this.lastPacketReceived;
1202	}
1203
1204	public void sendActive() {
1205		this.sendPacket(new ActivePacket());
1206	}
1207
1208	public void sendInactive() {
1209		this.sendPacket(new InactivePacket());
1210	}
1211
1212	public void resetAttemptCount() {
1213		this.attempt = 0;
1214		this.lastConnect = 0;
1215	}
1216
1217	public void setInteractive(boolean interactive) {
1218		this.mInteractive = interactive;
1219	}
1220
1221	private class Info {
1222		public final ArrayList<String> features = new ArrayList<>();
1223		public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1224	}
1225
1226	private class UnauthorizedException extends IOException {
1227
1228	}
1229
1230	private class SecurityException extends IOException {
1231
1232	}
1233
1234	private class IncompatibleServerException extends IOException {
1235
1236	}
1237
1238	private class DnsTimeoutException extends IOException {
1239
1240	}
1241
1242	public class Features {
1243		XmppConnection connection;
1244		private boolean carbonsEnabled = false;
1245		private boolean encryptionEnabled = false;
1246		private boolean blockListRequested = false;
1247
1248		public Features(final XmppConnection connection) {
1249			this.connection = connection;
1250		}
1251
1252		private boolean hasDiscoFeature(final Jid server, final String feature) {
1253			return connection.disco.containsKey(server) &&
1254				connection.disco.get(server).features.contains(feature);
1255		}
1256
1257		public boolean carbons() {
1258			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1259		}
1260
1261		public boolean blocking() {
1262			return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1263		}
1264
1265		public boolean register() {
1266			return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1267		}
1268
1269		public boolean sm() {
1270			return streamId != null
1271					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1272		}
1273
1274		public boolean csi() {
1275			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1276		}
1277
1278		public boolean pep() {
1279			final Pair<String,String> needle = new Pair<>("pubsub","pep");
1280			Info info = disco.get(account.getServer());
1281			if (info != null && info.identities.contains(needle)) {
1282				return true;
1283			} else {
1284				info = disco.get(account.getJid().toBareJid());
1285				return info != null && info.identities.contains(needle);
1286			}
1287		}
1288
1289		public boolean mam() {
1290			if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1291				return true;
1292			} else {
1293				return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1294			}
1295		}
1296
1297		public boolean advancedStreamFeaturesLoaded() {
1298			return disco.containsKey(account.getServer());
1299		}
1300
1301		public boolean rosterVersioning() {
1302			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1303		}
1304
1305		public void setBlockListRequested(boolean value) {
1306			this.blockListRequested = value;
1307		}
1308
1309		public boolean httpUpload() {
1310			return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1311		}
1312	}
1313
1314	private IqGenerator getIqGenerator() {
1315		return mXmppConnectionService.getIqGenerator();
1316	}
1317}