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.apache.http.conn.ssl.StrictHostnameVerifier;
  17import org.json.JSONException;
  18import org.json.JSONObject;
  19import org.xmlpull.v1.XmlPullParserException;
  20
  21import java.io.ByteArrayInputStream;
  22import java.io.IOException;
  23import java.io.InputStream;
  24import java.io.OutputStream;
  25import java.math.BigInteger;
  26import java.net.ConnectException;
  27import java.net.IDN;
  28import java.net.InetAddress;
  29import java.net.InetSocketAddress;
  30import java.net.Proxy;
  31import java.net.Socket;
  32import java.net.UnknownHostException;
  33import java.net.URL;
  34import java.security.KeyManagementException;
  35import java.security.NoSuchAlgorithmException;
  36import java.security.Principal;
  37import java.security.PrivateKey;
  38import java.security.cert.X509Certificate;
  39import java.util.ArrayList;
  40import java.util.Arrays;
  41import java.util.Collection;
  42import java.util.HashMap;
  43import java.util.Hashtable;
  44import java.util.Iterator;
  45import java.util.LinkedList;
  46import java.util.List;
  47import java.util.Map.Entry;
  48
  49import javax.net.ssl.HostnameVerifier;
  50import javax.net.ssl.KeyManager;
  51import javax.net.ssl.SSLContext;
  52import javax.net.ssl.SSLSocket;
  53import javax.net.ssl.SSLSocketFactory;
  54import javax.net.ssl.X509KeyManager;
  55import javax.net.ssl.X509TrustManager;
  56
  57import de.duenndns.ssl.MemorizingTrustManager;
  58import eu.siacs.conversations.Config;
  59import eu.siacs.conversations.crypto.XmppDomainVerifier;
  60import eu.siacs.conversations.crypto.sasl.DigestMd5;
  61import eu.siacs.conversations.crypto.sasl.External;
  62import eu.siacs.conversations.crypto.sasl.Plain;
  63import eu.siacs.conversations.crypto.sasl.SaslMechanism;
  64import eu.siacs.conversations.crypto.sasl.ScramSha1;
  65import eu.siacs.conversations.entities.Account;
  66import eu.siacs.conversations.entities.Message;
  67import eu.siacs.conversations.generator.IqGenerator;
  68import eu.siacs.conversations.services.XmppConnectionService;
  69import eu.siacs.conversations.utils.CryptoHelper;
  70import eu.siacs.conversations.utils.DNSHelper;
  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, Info> 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 boolean mInteractive = false;
 121	private int attempt = 0;
 122	private final Hashtable<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
 123	private OnPresencePacketReceived presenceListener = null;
 124	private OnJinglePacketReceived jingleListener = null;
 125	private OnIqPacketReceived unregisteredIqListener = null;
 126	private OnMessagePacketReceived messageListener = null;
 127	private OnStatusChanged statusListener = null;
 128	private OnBindListener bindListener = null;
 129	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
 130	private OnMessageAcknowledged acknowledgedListener = null;
 131	private XmppConnectionService mXmppConnectionService = null;
 132
 133	private SaslMechanism saslMechanism;
 134
 135	private X509KeyManager mKeyManager = new X509KeyManager() {
 136		@Override
 137		public String chooseClientAlias(String[] strings, Principal[] principals, Socket socket) {
 138			return account.getPrivateKeyAlias();
 139		}
 140
 141		@Override
 142		public String chooseServerAlias(String s, Principal[] principals, Socket socket) {
 143			return null;
 144		}
 145
 146		@Override
 147		public X509Certificate[] getCertificateChain(String alias) {
 148			try {
 149				return KeyChain.getCertificateChain(mXmppConnectionService, alias);
 150			} catch (Exception e) {
 151				return new X509Certificate[0];
 152			}
 153		}
 154
 155		@Override
 156		public String[] getClientAliases(String s, Principal[] principals) {
 157			return new String[0];
 158		}
 159
 160		@Override
 161		public String[] getServerAliases(String s, Principal[] principals) {
 162			return new String[0];
 163		}
 164
 165		@Override
 166		public PrivateKey getPrivateKey(String alias) {
 167			try {
 168				return KeyChain.getPrivateKey(mXmppConnectionService, alias);
 169			} catch (Exception e) {
 170				return null;
 171			}
 172		}
 173	};
 174	private Identity mServerIdentity = Identity.UNKNOWN;
 175
 176	private OnIqPacketReceived createPacketReceiveHandler() {
 177		return new OnIqPacketReceived() {
 178			@Override
 179			public void onIqPacketReceived(Account account, IqPacket packet) {
 180				if (packet.getType() == IqPacket.TYPE.RESULT) {
 181					account.setOption(Account.OPTION_REGISTER,
 182							false);
 183					changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
 184				} else if (packet.hasChild("error")
 185						&& (packet.findChild("error")
 186						.hasChild("conflict"))) {
 187					changeStatus(Account.State.REGISTRATION_CONFLICT);
 188				} else {
 189					changeStatus(Account.State.REGISTRATION_FAILED);
 190					Log.d(Config.LOGTAG, packet.toString());
 191				}
 192				disconnect(true);
 193			}
 194		};
 195	}
 196
 197	public XmppConnection(final Account account, final XmppConnectionService service) {
 198		this.account = account;
 199		this.wakeLock = service.getPowerManager().newWakeLock(
 200				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
 201		tagWriter = new TagWriter();
 202		mXmppConnectionService = service;
 203	}
 204
 205	protected void changeStatus(final Account.State nextStatus) {
 206		if (account.getStatus() != nextStatus) {
 207			if ((nextStatus == Account.State.OFFLINE)
 208					&& (account.getStatus() != Account.State.CONNECTING)
 209					&& (account.getStatus() != Account.State.ONLINE)
 210					&& (account.getStatus() != Account.State.DISABLED)) {
 211				return;
 212					}
 213			if (nextStatus == Account.State.ONLINE) {
 214				this.attempt = 0;
 215			}
 216			account.setStatus(nextStatus);
 217			if (statusListener != null) {
 218				statusListener.onStatusChanged(account);
 219			}
 220		}
 221	}
 222
 223	protected void connect() {
 224		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
 225		features.encryptionEnabled = false;
 226		lastConnect = SystemClock.elapsedRealtime();
 227		lastPingSent = SystemClock.elapsedRealtime();
 228		this.attempt++;
 229		if (account.getJid().getDomainpart().equals("chat.facebook.com")) {
 230			mServerIdentity = Identity.FACEBOOK;
 231		}
 232		try {
 233			shouldAuthenticate = needsBinding = !account.isOptionSet(Account.OPTION_REGISTER);
 234			tagReader = new XmlReader(wakeLock);
 235			tagWriter = new TagWriter();
 236			this.changeStatus(Account.State.CONNECTING);
 237			final boolean useTor = mXmppConnectionService.useTorToConnect();
 238			final Proxy TOR_PROXY = new Proxy(Proxy.Type.SOCKS, new InetSocketAddress(InetAddress.getLocalHost(), 9050));
 239			if (DNSHelper.isIp(account.getServer().toString())) {
 240				socket = useTor ? new Socket(TOR_PROXY) : new Socket();
 241				try {
 242					socket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
 243				} catch (IOException e) {
 244					throw new UnknownHostException();
 245				}
 246			} else {
 247				final ArrayList<Parcelable> values;
 248				if (useTor) {
 249					values = account.getHostnamePortBundles();
 250				} else {
 251					final Bundle result = DNSHelper.getSRVRecord(account.getServer(),mXmppConnectionService);
 252					values = result.getParcelableArrayList("values");
 253				}
 254				int i = 0;
 255				boolean socketError = true;
 256				while (socketError && values.size() > i) {
 257					final Bundle namePort = (Bundle) values.get(i);
 258					try {
 259						String srvRecordServer;
 260						try {
 261							srvRecordServer = IDN.toASCII(namePort.getString("name"));
 262						} catch (final IllegalArgumentException e) {
 263							// TODO: Handle me?`
 264							srvRecordServer = "";
 265						}
 266						final int srvRecordPort = namePort.getInt("port");
 267						final String srvIpServer = namePort.getString("ip");
 268						final InetSocketAddress addr;
 269						if (srvIpServer != null) {
 270							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
 271							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 272									+ ": using values from dns " + srvRecordServer
 273									+ "[" + srvIpServer + "]:" + srvRecordPort);
 274						} else {
 275							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
 276							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 277									+ ": using values from dns "
 278									+ srvRecordServer + ":" + srvRecordPort);
 279						}
 280						socket = useTor ? new Socket(TOR_PROXY) : new Socket();
 281						socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
 282						socketError = false;
 283					} catch (final Throwable e) {
 284						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage() +"("+e.getClass().getName()+")");
 285						i++;
 286					}
 287				}
 288				if (socketError) {
 289					throw new UnknownHostException();
 290				}
 291			}
 292			final OutputStream out = socket.getOutputStream();
 293			tagWriter.setOutputStream(out);
 294			final InputStream in = socket.getInputStream();
 295			tagReader.setInputStream(in);
 296			tagWriter.beginDocument();
 297			sendStartStream();
 298			Tag nextTag;
 299			while ((nextTag = tagReader.readTag()) != null) {
 300				if (nextTag.isStart("stream")) {
 301					processStream();
 302					break;
 303				} else {
 304					throw new IOException("unknown tag on connect");
 305				}
 306			}
 307			if (socket.isConnected()) {
 308				socket.close();
 309			}
 310		} catch (final IncompatibleServerException e) {
 311			this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
 312		} catch (final SecurityException e) {
 313			this.changeStatus(Account.State.SECURITY_ERROR);
 314		} catch (final UnauthorizedException e) {
 315			this.changeStatus(Account.State.UNAUTHORIZED);
 316		} catch (final UnknownHostException | ConnectException e) {
 317			this.changeStatus(Account.State.SERVER_NOT_FOUND);
 318		} catch (final DnsTimeoutException e) {
 319			this.changeStatus(Account.State.DNS_TIMEOUT);
 320		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
 321			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
 322			this.changeStatus(Account.State.OFFLINE);
 323			this.attempt--; //don't count attempt when reconnecting instantly anyway
 324		} finally {
 325			if (socket != null) {
 326				try {
 327					socket.close();
 328				} catch (IOException e) {
 329
 330				}
 331			}
 332			if (wakeLock.isHeld()) {
 333				try {
 334					wakeLock.release();
 335				} catch (final RuntimeException ignored) {
 336				}
 337			}
 338		}
 339	}
 340
 341	@Override
 342	public void run() {
 343		try {
 344			if (socket != null) {
 345				socket.close();
 346			}
 347		} catch (final IOException ignored) {
 348
 349		}
 350		connect();
 351	}
 352
 353	private void processStream() throws XmlPullParserException, IOException, NoSuchAlgorithmException {
 354						Tag nextTag = tagReader.readTag();
 355						while (nextTag != null && !nextTag.isEnd("stream")) {
 356							if (nextTag.isStart("error")) {
 357								processStreamError(nextTag);
 358							} else if (nextTag.isStart("features")) {
 359								processStreamFeatures(nextTag);
 360							} else if (nextTag.isStart("proceed")) {
 361								switchOverToTls(nextTag);
 362							} else if (nextTag.isStart("success")) {
 363								final String challenge = tagReader.readElement(nextTag).getContent();
 364								try {
 365									saslMechanism.getResponse(challenge);
 366								} catch (final SaslMechanism.AuthenticationException e) {
 367									disconnect(true);
 368									Log.e(Config.LOGTAG, String.valueOf(e));
 369								}
 370								Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
 371								account.setKey(Account.PINNED_MECHANISM_KEY,
 372										String.valueOf(saslMechanism.getPriority()));
 373								tagReader.reset();
 374								sendStartStream();
 375								final Tag tag = tagReader.readTag();
 376								if (tag != null && tag.isStart("stream")) {
 377									processStream();
 378								} else {
 379									throw new IOException("server didn't restart stream after successful auth");
 380								}
 381								break;
 382							} else if (nextTag.isStart("failure")) {
 383								throw new UnauthorizedException();
 384							} else if (nextTag.isStart("challenge")) {
 385								final String challenge = tagReader.readElement(nextTag).getContent();
 386								final Element response = new Element("response");
 387								response.setAttribute("xmlns",
 388										"urn:ietf:params:xml:ns:xmpp-sasl");
 389								try {
 390									response.setContent(saslMechanism.getResponse(challenge));
 391								} catch (final SaslMechanism.AuthenticationException e) {
 392									// TODO: Send auth abort tag.
 393									Log.e(Config.LOGTAG, e.toString());
 394								}
 395								tagWriter.writeElement(response);
 396							} else if (nextTag.isStart("enabled")) {
 397								final Element enabled = tagReader.readElement(nextTag);
 398								if ("true".equals(enabled.getAttribute("resume"))) {
 399									this.streamId = enabled.getAttribute("id");
 400									Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 401											+ ": stream managment(" + smVersion
 402											+ ") enabled (resumable)");
 403								} else {
 404									Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 405											+ ": stream management(" + smVersion + ") enabled");
 406								}
 407								this.stanzasReceived = 0;
 408								final RequestPacket r = new RequestPacket(smVersion);
 409								tagWriter.writeStanzaAsync(r);
 410							} else if (nextTag.isStart("resumed")) {
 411								lastPacketReceived = SystemClock.elapsedRealtime();
 412								final Element resumed = tagReader.readElement(nextTag);
 413								final String h = resumed.getAttribute("h");
 414								try {
 415									final int serverCount = Integer.parseInt(h);
 416									if (serverCount != stanzasSent) {
 417										Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
 418												+ ": session resumed with lost packages");
 419										stanzasSent = serverCount;
 420									} else {
 421										Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
 422									}
 423									acknowledgeStanzaUpTo(serverCount);
 424									ArrayList<AbstractAcknowledgeableStanza> failedStanzas = new ArrayList<>();
 425									for(int i = 0; i < this.mStanzaQueue.size(); ++i) {
 426										failedStanzas.add(mStanzaQueue.valueAt(i));
 427									}
 428									mStanzaQueue.clear();
 429									Log.d(Config.LOGTAG,"resending "+failedStanzas.size()+" stanzas");
 430									for(AbstractAcknowledgeableStanza packet : failedStanzas) {
 431										if (packet instanceof MessagePacket) {
 432											MessagePacket message = (MessagePacket) packet;
 433											mXmppConnectionService.markMessage(account,
 434													message.getTo().toBareJid(),
 435													message.getId(),
 436													Message.STATUS_UNSEND);
 437										}
 438										sendPacket(packet);
 439									}
 440								} catch (final NumberFormatException ignored) {
 441								}
 442								Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": online with resource " + account.getResource());
 443								changeStatus(Account.State.ONLINE);
 444							} else if (nextTag.isStart("r")) {
 445								tagReader.readElement(nextTag);
 446								if (Config.EXTENDED_SM_LOGGING) {
 447									Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
 448								}
 449								final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
 450								tagWriter.writeStanzaAsync(ack);
 451							} else if (nextTag.isStart("a")) {
 452								final Element ack = tagReader.readElement(nextTag);
 453								lastPacketReceived = SystemClock.elapsedRealtime();
 454								try {
 455									final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
 456									acknowledgeStanzaUpTo(serverSequence);
 457								} catch (NumberFormatException e) {
 458									Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 459								}
 460							} else if (nextTag.isStart("failed")) {
 461								tagReader.readElement(nextTag);
 462								Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
 463								streamId = null;
 464								if (account.getStatus() != Account.State.ONLINE) {
 465									sendBindRequest();
 466								}
 467							} else if (nextTag.isStart("iq")) {
 468								processIq(nextTag);
 469							} else if (nextTag.isStart("message")) {
 470								processMessage(nextTag);
 471							} else if (nextTag.isStart("presence")) {
 472								processPresence(nextTag);
 473							}
 474							nextTag = tagReader.readTag();
 475						}
 476						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": last tag was " + nextTag);
 477						if (account.getStatus() == Account.State.ONLINE) {
 478							account. setStatus(Account.State.OFFLINE);
 479							if (statusListener != null) {
 480								statusListener.onStatusChanged(account);
 481							}
 482						}
 483	}
 484
 485	private void acknowledgeStanzaUpTo(int serverCount) {
 486		for (int i = 0; i < mStanzaQueue.size(); ++i) {
 487			if (serverCount >= mStanzaQueue.keyAt(i)) {
 488				if (Config.EXTENDED_SM_LOGGING) {
 489					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaQueue.keyAt(i));
 490				}
 491				AbstractAcknowledgeableStanza stanza = mStanzaQueue.valueAt(i);
 492				if (stanza instanceof MessagePacket && acknowledgedListener != null) {
 493					MessagePacket packet = (MessagePacket) stanza;
 494					acknowledgedListener.onMessageAcknowledged(account, packet.getId());
 495				}
 496				mStanzaQueue.removeAt(i);
 497				i--;
 498			}
 499		}
 500	}
 501
 502	private Element processPacket(final Tag currentTag, final int packetType)
 503		throws XmlPullParserException, IOException {
 504		Element element;
 505		switch (packetType) {
 506			case PACKET_IQ:
 507				element = new IqPacket();
 508				break;
 509			case PACKET_MESSAGE:
 510				element = new MessagePacket();
 511				break;
 512			case PACKET_PRESENCE:
 513				element = new PresencePacket();
 514				break;
 515			default:
 516				return null;
 517		}
 518		element.setAttributes(currentTag.getAttributes());
 519		Tag nextTag = tagReader.readTag();
 520		if (nextTag == null) {
 521			throw new IOException("interrupted mid tag");
 522		}
 523		while (!nextTag.isEnd(element.getName())) {
 524			if (!nextTag.isNo()) {
 525				final Element child = tagReader.readElement(nextTag);
 526				final String type = currentTag.getAttribute("type");
 527				if (packetType == PACKET_IQ
 528						&& "jingle".equals(child.getName())
 529						&& ("set".equalsIgnoreCase(type) || "get"
 530							.equalsIgnoreCase(type))) {
 531					element = new JinglePacket();
 532					element.setAttributes(currentTag.getAttributes());
 533							}
 534				element.addChild(child);
 535			}
 536			nextTag = tagReader.readTag();
 537			if (nextTag == null) {
 538				throw new IOException("interrupted mid tag");
 539			}
 540		}
 541		if (stanzasReceived == Integer.MAX_VALUE) {
 542			resetStreamId();
 543			throw new IOException("time to restart the session. cant handle >2 billion pcks");
 544		}
 545		++stanzasReceived;
 546		lastPacketReceived = SystemClock.elapsedRealtime();
 547		return element;
 548	}
 549
 550	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
 551		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
 552
 553		if (packet.getId() == null) {
 554			return; // an iq packet without id is definitely invalid
 555		}
 556
 557		if (packet instanceof JinglePacket) {
 558			if (this.jingleListener != null) {
 559				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
 560			}
 561		} else {
 562			OnIqPacketReceived callback = null;
 563			synchronized (this.packetCallbacks) {
 564				if (packetCallbacks.containsKey(packet.getId())) {
 565					final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
 566					// Packets to the server should have responses from the server
 567					if (packetCallbackDuple.first.toServer(account)) {
 568						if (packet.fromServer(account) || mServerIdentity == Identity.FACEBOOK) {
 569							callback = packetCallbackDuple.second;
 570							packetCallbacks.remove(packet.getId());
 571						} else {
 572							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 573						}
 574					} else {
 575						if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
 576							callback = packetCallbackDuple.second;
 577							packetCallbacks.remove(packet.getId());
 578						} else {
 579							Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
 580						}
 581					}
 582				} else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 583					callback = this.unregisteredIqListener;
 584				}
 585			}
 586			if (callback != null) {
 587				callback.onIqPacketReceived(account,packet);
 588			}
 589		}
 590	}
 591
 592	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
 593		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
 594		this.messageListener.onMessagePacketReceived(account, packet);
 595	}
 596
 597	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
 598		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
 599		this.presenceListener.onPresencePacketReceived(account, packet);
 600	}
 601
 602	private void sendStartTLS() throws IOException {
 603		final Tag startTLS = Tag.empty("starttls");
 604		startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
 605		tagWriter.writeTag(startTLS);
 606	}
 607
 608	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
 609		tagReader.readTag();
 610		try {
 611			final SSLContext sc = SSLContext.getInstance("TLS");
 612			MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
 613			KeyManager[] keyManager;
 614			if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 615				keyManager = new KeyManager[]{ mKeyManager };
 616			} else {
 617				keyManager = null;
 618			}
 619			sc.init(keyManager,new X509TrustManager[]{mInteractive ? trustManager : trustManager.getNonInteractive()},mXmppConnectionService.getRNG());
 620			final SSLSocketFactory factory = sc.getSocketFactory();
 621			final HostnameVerifier verifier;
 622			if (mInteractive) {
 623				verifier = trustManager.wrapHostnameVerifier(new XmppDomainVerifier());
 624			} else {
 625				verifier = trustManager.wrapHostnameVerifierNonInteractive(new XmppDomainVerifier());
 626			}
 627			final InetAddress address = socket == null ? null : socket.getInetAddress();
 628
 629			if (factory == null || address == null || verifier == null) {
 630				throw new IOException("could not setup ssl");
 631			}
 632
 633			final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
 634
 635			if (sslSocket == null) {
 636				throw new IOException("could not initialize ssl socket");
 637			}
 638
 639			final String[] supportProtocols;
 640			final Collection<String> supportedProtocols = new LinkedList<>(
 641					Arrays.asList(sslSocket.getSupportedProtocols()));
 642			supportedProtocols.remove("SSLv3");
 643			supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
 644
 645			sslSocket.setEnabledProtocols(supportProtocols);
 646
 647			final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
 648					sslSocket.getSupportedCipherSuites());
 649			//Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
 650			if (cipherSuites.length > 0) {
 651				sslSocket.setEnabledCipherSuites(cipherSuites);
 652			}
 653
 654			if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
 655				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
 656				throw new SecurityException();
 657			}
 658			tagReader.setInputStream(sslSocket.getInputStream());
 659			tagWriter.setOutputStream(sslSocket.getOutputStream());
 660			sendStartStream();
 661			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
 662			features.encryptionEnabled = true;
 663			final Tag tag = tagReader.readTag();
 664			if (tag != null && tag.isStart("stream")) {
 665				processStream();
 666			} else {
 667				throw new IOException("server didn't restart stream after STARTTLS");
 668			}
 669			sslSocket.close();
 670		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 671			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": TLS certificate verification failed");
 672			throw new SecurityException();
 673		}
 674	}
 675
 676	private void processStreamFeatures(final Tag currentTag)
 677		throws XmlPullParserException, IOException {
 678		this.streamFeatures = tagReader.readElement(currentTag);
 679		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
 680			sendStartTLS();
 681		} else if (this.streamFeatures.hasChild("register")
 682				&& account.isOptionSet(Account.OPTION_REGISTER)
 683				&& features.encryptionEnabled) {
 684			sendRegistryRequest();
 685		} else if (!this.streamFeatures.hasChild("register")
 686				&& account.isOptionSet(Account.OPTION_REGISTER)) {
 687			changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
 688			disconnect(true);
 689		} else if (this.streamFeatures.hasChild("mechanisms")
 690				&& shouldAuthenticate && features.encryptionEnabled) {
 691			final List<String> mechanisms = extractMechanisms(streamFeatures
 692					.findChild("mechanisms"));
 693			final Element auth = new Element("auth");
 694			auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
 695			if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
 696				saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
 697			} else if (mechanisms.contains("SCRAM-SHA-1")) {
 698				saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
 699			} else if (mechanisms.contains("PLAIN")) {
 700				saslMechanism = new Plain(tagWriter, account);
 701			} else if (mechanisms.contains("DIGEST-MD5")) {
 702				saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
 703			}
 704			if (saslMechanism != null) {
 705				final JSONObject keys = account.getKeys();
 706				try {
 707					if (keys.has(Account.PINNED_MECHANISM_KEY) &&
 708							keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
 709						Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
 710								" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
 711								") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
 712								"). Possible downgrade attack?");
 713						throw new SecurityException();
 714					}
 715				} catch (final JSONException e) {
 716					Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
 717				}
 718				Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
 719				auth.setAttribute("mechanism", saslMechanism.getMechanism());
 720				if (!saslMechanism.getClientFirstMessage().isEmpty()) {
 721					auth.setContent(saslMechanism.getClientFirstMessage());
 722				}
 723				tagWriter.writeElement(auth);
 724			} else {
 725				throw new IncompatibleServerException();
 726			}
 727		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:" + smVersion) && streamId != null) {
 728			if (Config.EXTENDED_SM_LOGGING) {
 729				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
 730			}
 731			final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
 732			this.tagWriter.writeStanzaAsync(resume);
 733		} else if (needsBinding) {
 734			if (this.streamFeatures.hasChild("bind")) {
 735				sendBindRequest();
 736			} else {
 737				throw new IncompatibleServerException();
 738			}
 739		}
 740	}
 741
 742	private List<String> extractMechanisms(final Element stream) {
 743		final ArrayList<String> mechanisms = new ArrayList<>(stream
 744				.getChildren().size());
 745		for (final Element child : stream.getChildren()) {
 746			mechanisms.add(child.getContent());
 747		}
 748		return mechanisms;
 749	}
 750
 751	public void sendCaptchaRegistryRequest(String id, Data data) {
 752		if (data == null) {
 753			setAccountCreationFailed("");
 754		} else {
 755			IqPacket request = getIqGenerator().generateCreateAccountWithCaptcha(account, id, data);
 756			sendIqPacket(request, createPacketReceiveHandler());
 757		}
 758	}
 759
 760	private void sendRegistryRequest() {
 761		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
 762		register.query("jabber:iq:register");
 763		register.setTo(account.getServer());
 764		sendIqPacket(register, new OnIqPacketReceived() {
 765
 766			@Override
 767			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 768				boolean failed = false;
 769				if (packet.getType() == IqPacket.TYPE.RESULT
 770						&& packet.query().hasChild("username")
 771						&& (packet.query().hasChild("password"))) {
 772					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 773					final Element username = new Element("username").setContent(account.getUsername());
 774					final Element password = new Element("password").setContent(account.getPassword());
 775					register.query("jabber:iq:register").addChild(username);
 776					register.query().addChild(password);
 777					sendIqPacket(register, createPacketReceiveHandler());
 778				} else if (packet.getType() == IqPacket.TYPE.RESULT
 779						&& (packet.query().hasChild("x", "jabber:x:data"))) {
 780					final Data data = Data.parse(packet.query().findChild("x", "jabber:x:data"));
 781					final Element blob = packet.query().findChild("data", "urn:xmpp:bob");
 782					final String id = packet.getId();
 783
 784					Bitmap captcha = null;
 785					if (blob != null) {
 786						try {
 787							final String base64Blob = blob.getContent();
 788							final byte[] strBlob = Base64.decode(base64Blob, Base64.DEFAULT);
 789							InputStream stream = new ByteArrayInputStream(strBlob);
 790							captcha = BitmapFactory.decodeStream(stream);
 791						} catch (Exception e) {
 792							//ignored
 793						}
 794					} else {
 795						try {
 796							Field url = data.getFieldByName("url");
 797							String urlString = url.findChildContent("value");
 798							URL uri = new URL(urlString);
 799							captcha = BitmapFactory.decodeStream(uri.openConnection().getInputStream());
 800						} catch (IOException e) {
 801							Log.e(Config.LOGTAG, e.toString());
 802						}
 803					}
 804
 805					if (captcha != null) {
 806						failed = !mXmppConnectionService.displayCaptchaRequest(account, id, data, captcha);
 807					}
 808				} else {
 809					failed = true;
 810				}
 811
 812				if (failed) {
 813					final Element instructions = packet.query().findChild("instructions");
 814					setAccountCreationFailed((instructions != null) ? instructions.getContent() : "");
 815				}
 816			}
 817		});
 818	}
 819
 820	private void setAccountCreationFailed(String instructions) {
 821		changeStatus(Account.State.REGISTRATION_FAILED);
 822		disconnect(true);
 823		Log.d(Config.LOGTAG, account.getJid().toBareJid()
 824				+ ": could not register. instructions are"
 825				+ instructions);
 826	}
 827
 828	private void sendBindRequest() {
 829		while(!mXmppConnectionService.areMessagesInitialized() && socket != null && !socket.isClosed()) {
 830			try {
 831				Thread.sleep(500);
 832			} catch (final InterruptedException ignored) {
 833			}
 834		}
 835		needsBinding = false;
 836		clearIqCallbacks();
 837		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
 838		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
 839				.addChild("resource").setContent(account.getResource());
 840		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
 841			@Override
 842			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 843				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 844					return;
 845				}
 846				final Element bind = packet.findChild("bind");
 847				if (bind != null && packet.getType() == IqPacket.TYPE.RESULT) {
 848					final Element jid = bind.findChild("jid");
 849					if (jid != null && jid.getContent() != null) {
 850						try {
 851							account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
 852						} catch (final InvalidJidException e) {
 853							// TODO: Handle the case where an external JID is technically invalid?
 854						}
 855						if (streamFeatures.hasChild("session")) {
 856							sendStartSession();
 857						} else {
 858							sendPostBindInitialization();
 859						}
 860					} else {
 861						Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure");
 862						disconnect(true);
 863					}
 864				} else {
 865					Log.d(Config.LOGTAG, account.getJid() + ": disconnecting because of bind failure");
 866					disconnect(true);
 867				}
 868			}
 869		});
 870	}
 871
 872	private void clearIqCallbacks() {
 873		final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.TIMEOUT);
 874		final ArrayList<OnIqPacketReceived> callbacks = new ArrayList<>();
 875		synchronized (this.packetCallbacks) {
 876			if (this.packetCallbacks.size() == 0) {
 877				return;
 878			}
 879			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing "+this.packetCallbacks.size()+" iq callbacks");
 880			final Iterator<Pair<IqPacket, OnIqPacketReceived>> iterator = this.packetCallbacks.values().iterator();
 881			while (iterator.hasNext()) {
 882				Pair<IqPacket, OnIqPacketReceived> entry = iterator.next();
 883				callbacks.add(entry.second);
 884				iterator.remove();
 885			}
 886		}
 887		for(OnIqPacketReceived callback : callbacks) {
 888			callback.onIqPacketReceived(account,failurePacket);
 889		}
 890		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": done clearing iq callbacks. " + this.packetCallbacks.size() + " left");
 891	}
 892
 893	private void sendStartSession() {
 894		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
 895		startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
 896		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
 897			@Override
 898			public void onIqPacketReceived(Account account, IqPacket packet) {
 899				if (packet.getType() == IqPacket.TYPE.RESULT) {
 900					sendPostBindInitialization();
 901				} else if (packet.getType() != IqPacket.TYPE.TIMEOUT) {
 902					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not init sessions");
 903					disconnect(true);
 904				}
 905			}
 906		});
 907	}
 908
 909	private void sendPostBindInitialization() {
 910		smVersion = 0;
 911		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
 912			smVersion = 3;
 913		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
 914			smVersion = 2;
 915		}
 916		if (smVersion != 0) {
 917			final EnablePacket enable = new EnablePacket(smVersion);
 918			tagWriter.writeStanzaAsync(enable);
 919			stanzasSent = 0;
 920			mStanzaQueue.clear();
 921		}
 922		features.carbonsEnabled = false;
 923		features.blockListRequested = false;
 924		synchronized (this.disco) {
 925			this.disco.clear();
 926		}
 927		sendServiceDiscoveryInfo(account.getServer());
 928		sendServiceDiscoveryInfo(account.getJid().toBareJid());
 929		sendServiceDiscoveryItems(account.getServer());
 930		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": online with resource " + account.getResource());
 931		this.lastSessionStarted = SystemClock.elapsedRealtime();
 932		changeStatus(Account.State.ONLINE);
 933		if (bindListener != null) {
 934			bindListener.onBind(account);
 935		}
 936	}
 937
 938	private void sendServiceDiscoveryInfo(final Jid jid) {
 939		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
 940		iq.setTo(jid);
 941		iq.query("http://jabber.org/protocol/disco#info");
 942		this.sendIqPacket(iq, new OnIqPacketReceived() {
 943
 944			@Override
 945			public void onIqPacketReceived(final Account account, final IqPacket packet) {
 946				if (packet.getType() == IqPacket.TYPE.RESULT) {
 947					boolean advancedStreamFeaturesLoaded = false;
 948					synchronized (XmppConnection.this.disco) {
 949						final List<Element> elements = packet.query().getChildren();
 950						final Info info = new Info();
 951						for (final Element element : elements) {
 952							if (element.getName().equals("identity")) {
 953								String type = element.getAttribute("type");
 954								String category = element.getAttribute("category");
 955								String name = element.getAttribute("name");
 956								if (type != null && category != null) {
 957									info.identities.add(new Pair<>(category, type));
 958									if (type.equals("im") && category.equals("server")) {
 959										if (name != null && jid.equals(account.getServer())) {
 960											switch (name) {
 961												case "Prosody":
 962													mServerIdentity = Identity.PROSODY;
 963													break;
 964												case "ejabberd":
 965													mServerIdentity = Identity.EJABBERD;
 966													break;
 967												case "Slack-XMPP":
 968													mServerIdentity = Identity.SLACK;
 969													break;
 970											}
 971											Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server name: " + name);
 972										}
 973									}
 974								}
 975							} else if (element.getName().equals("feature")) {
 976								info.features.add(element.getAttribute("var"));
 977							}
 978						}
 979						disco.put(jid, info);
 980						advancedStreamFeaturesLoaded = disco.containsKey(account.getServer())
 981								&& disco.containsKey(account.getJid().toBareJid());
 982					}
 983					if (advancedStreamFeaturesLoaded && (jid.equals(account.getServer()) || jid.equals(account.getJid().toBareJid()))) {
 984						enableAdvancedStreamFeatures();
 985					}
 986				} else {
 987					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": could not query disco info for " + jid.toString());
 988				}
 989			}
 990		});
 991	}
 992
 993	private void enableAdvancedStreamFeatures() {
 994		if (getFeatures().carbons() && !features.carbonsEnabled) {
 995			sendEnableCarbons();
 996		}
 997		if (getFeatures().blocking() && !features.blockListRequested) {
 998			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
 999			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
1000		}
1001		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
1002			listener.onAdvancedStreamFeaturesAvailable(account);
1003		}
1004	}
1005
1006	private void sendServiceDiscoveryItems(final Jid server) {
1007		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1008		iq.setTo(server.toDomainJid());
1009		iq.query("http://jabber.org/protocol/disco#items");
1010		this.sendIqPacket(iq, new OnIqPacketReceived() {
1011
1012			@Override
1013			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1014				if (packet.getType() == IqPacket.TYPE.RESULT) {
1015					final List<Element> elements = packet.query().getChildren();
1016					for (final Element element : elements) {
1017						if (element.getName().equals("item")) {
1018							final Jid jid = element.getAttributeAsJid("jid");
1019							if (jid != null && !jid.equals(account.getServer())) {
1020								sendServiceDiscoveryInfo(jid);
1021							}
1022						}
1023					}
1024				} else {
1025					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": could not query disco items of "+server);
1026				}
1027			}
1028		});
1029	}
1030
1031	private void sendEnableCarbons() {
1032		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
1033		iq.addChild("enable", "urn:xmpp:carbons:2");
1034		this.sendIqPacket(iq, new OnIqPacketReceived() {
1035
1036			@Override
1037			public void onIqPacketReceived(final Account account, final IqPacket packet) {
1038				if (!packet.hasChild("error")) {
1039					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1040							+ ": successfully enabled carbons");
1041					features.carbonsEnabled = true;
1042				} else {
1043					Log.d(Config.LOGTAG, account.getJid().toBareJid()
1044							+ ": error enableing carbons " + packet.toString());
1045				}
1046			}
1047		});
1048	}
1049
1050	private void processStreamError(final Tag currentTag)
1051		throws XmlPullParserException, IOException {
1052		final Element streamError = tagReader.readElement(currentTag);
1053		if (streamError != null && streamError.hasChild("conflict")) {
1054			final String resource = account.getResource().split("\\.")[0];
1055			account.setResource(resource + "." + nextRandomId());
1056			Log.d(Config.LOGTAG,
1057					account.getJid().toBareJid() + ": switching resource due to conflict ("
1058					+ account.getResource() + ")");
1059		} else if (streamError != null) {
1060			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": stream error "+streamError.toString());
1061		}
1062	}
1063
1064	private void sendStartStream() throws IOException {
1065		final Tag stream = Tag.start("stream:stream");
1066		stream.setAttribute("to", account.getServer().toString());
1067		stream.setAttribute("version", "1.0");
1068		stream.setAttribute("xml:lang", "en");
1069		stream.setAttribute("xmlns", "jabber:client");
1070		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
1071		tagWriter.writeTag(stream);
1072	}
1073
1074	private String nextRandomId() {
1075		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
1076	}
1077
1078	public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1079		packet.setFrom(account.getJid());
1080		this.sendUnmodifiedIqPacket(packet, callback);
1081
1082	}
1083
1084	private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
1085		if (packet.getId() == null) {
1086			final String id = nextRandomId();
1087			packet.setAttribute("id", id);
1088		}
1089		if (callback != null) {
1090			synchronized (this.packetCallbacks) {
1091				packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
1092			}
1093		}
1094		this.sendPacket(packet);
1095	}
1096
1097	public void sendMessagePacket(final MessagePacket packet) {
1098		this.sendPacket(packet);
1099	}
1100
1101	public void sendPresencePacket(final PresencePacket packet) {
1102		this.sendPacket(packet);
1103	}
1104
1105	private synchronized void sendPacket(final AbstractStanza packet) {
1106		if (stanzasSent == Integer.MAX_VALUE) {
1107			resetStreamId();
1108			disconnect(true);
1109			return;
1110		}
1111		tagWriter.writeStanzaAsync(packet);
1112		if (packet instanceof AbstractAcknowledgeableStanza) {
1113			AbstractAcknowledgeableStanza stanza = (AbstractAcknowledgeableStanza) packet;
1114			++stanzasSent;
1115			this.mStanzaQueue.put(stanzasSent, stanza);
1116			if (stanza instanceof MessagePacket && stanza.getId() != null && getFeatures().sm()) {
1117				if (Config.EXTENDED_SM_LOGGING) {
1118					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
1119				}
1120				tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
1121			}
1122		}
1123	}
1124
1125	public void sendPing() {
1126		if (!r()) {
1127			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
1128			iq.setFrom(account.getJid());
1129			iq.addChild("ping", "urn:xmpp:ping");
1130			this.sendIqPacket(iq, null);
1131		}
1132		this.lastPingSent = SystemClock.elapsedRealtime();
1133	}
1134
1135	public void setOnMessagePacketReceivedListener(
1136			final OnMessagePacketReceived listener) {
1137		this.messageListener = listener;
1138			}
1139
1140	public void setOnUnregisteredIqPacketReceivedListener(
1141			final OnIqPacketReceived listener) {
1142		this.unregisteredIqListener = listener;
1143			}
1144
1145	public void setOnPresencePacketReceivedListener(
1146			final OnPresencePacketReceived listener) {
1147		this.presenceListener = listener;
1148			}
1149
1150	public void setOnJinglePacketReceivedListener(
1151			final OnJinglePacketReceived listener) {
1152		this.jingleListener = listener;
1153			}
1154
1155	public void setOnStatusChangedListener(final OnStatusChanged listener) {
1156		this.statusListener = listener;
1157	}
1158
1159	public void setOnBindListener(final OnBindListener listener) {
1160		this.bindListener = listener;
1161	}
1162
1163	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1164		this.acknowledgedListener = listener;
1165	}
1166
1167	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1168		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1169			this.advancedStreamFeaturesLoadedListeners.add(listener);
1170		}
1171	}
1172
1173	public void disconnect(final boolean force) {
1174		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting force="+Boolean.valueOf(force));
1175		if (force) {
1176			try {
1177				socket.close();
1178			} catch(Exception e) {
1179				Log.d(Config.LOGTAG,account.getJid().toBareJid().toString()+": exception during force close ("+e.getMessage()+")");
1180			}
1181			return;
1182		} else {
1183			resetStreamId();
1184			if (tagWriter.isActive()) {
1185				tagWriter.finish();
1186				try {
1187					int i = 0;
1188					boolean warned = false;
1189					while (!tagWriter.finished() && socket.isConnected() && i <= 10) {
1190						if (!warned) {
1191							Log.d(Config.LOGTAG, account.getJid().toBareJid()+": waiting for tag writer to finish");
1192							warned = true;
1193						}
1194						Thread.sleep(200);
1195						i++;
1196					}
1197					if (warned) {
1198						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": tag writer has finished");
1199					}
1200					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": closing stream");
1201					tagWriter.writeTag(Tag.end("stream:stream"));
1202				} catch (final IOException e) {
1203					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": io exception during disconnect ("+e.getMessage()+")");
1204				} catch (final InterruptedException e) {
1205					Log.d(Config.LOGTAG, "interrupted");
1206				}
1207			}
1208		}
1209	}
1210
1211	public void resetStreamId() {
1212		this.streamId = null;
1213	}
1214
1215	public List<Jid> findDiscoItemsByFeature(final String feature) {
1216		synchronized (this.disco) {
1217			final List<Jid> items = new ArrayList<>();
1218			for (final Entry<Jid, Info> cursor : this.disco.entrySet()) {
1219				if (cursor.getValue().features.contains(feature)) {
1220					items.add(cursor.getKey());
1221				}
1222			}
1223			return items;
1224		}
1225	}
1226
1227	public Jid findDiscoItemByFeature(final String feature) {
1228		final List<Jid> items = findDiscoItemsByFeature(feature);
1229		if (items.size() >= 1) {
1230			return items.get(0);
1231		}
1232		return null;
1233	}
1234
1235	public boolean r() {
1236		if (getFeatures().sm()) {
1237			this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1238			return true;
1239		} else {
1240			return false;
1241		}
1242	}
1243
1244	public String getMucServer() {
1245		synchronized (this.disco) {
1246			for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1247				final Info value = cursor.getValue();
1248				if (value.features.contains("http://jabber.org/protocol/muc")
1249						&& !value.features.contains("jabber:iq:gateway")
1250						&& !value.identities.contains(new Pair<>("conference", "irc"))) {
1251					return cursor.getKey().toString();
1252				}
1253			}
1254		}
1255		return null;
1256	}
1257
1258	public int getTimeToNextAttempt() {
1259		final int interval = (int) (25 * Math.pow(1.5, attempt));
1260		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1261		return interval - secondsSinceLast;
1262	}
1263
1264	public int getAttempt() {
1265		return this.attempt;
1266	}
1267
1268	public Features getFeatures() {
1269		return this.features;
1270	}
1271
1272	public long getLastSessionEstablished() {
1273		final long diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1274		return System.currentTimeMillis() - diff;
1275	}
1276
1277	public long getLastConnect() {
1278		return this.lastConnect;
1279	}
1280
1281	public long getLastPingSent() {
1282		return this.lastPingSent;
1283	}
1284
1285	public long getLastPacketReceived() {
1286		return this.lastPacketReceived;
1287	}
1288
1289	public void sendActive() {
1290		this.sendPacket(new ActivePacket());
1291	}
1292
1293	public void sendInactive() {
1294		this.sendPacket(new InactivePacket());
1295	}
1296
1297	public void resetAttemptCount() {
1298		this.attempt = 0;
1299		this.lastConnect = 0;
1300	}
1301
1302	public void setInteractive(boolean interactive) {
1303		this.mInteractive = interactive;
1304	}
1305
1306	public Identity getServerIdentity() {
1307		return mServerIdentity;
1308	}
1309
1310	private class Info {
1311		public final ArrayList<String> features = new ArrayList<>();
1312		public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1313	}
1314
1315	private class UnauthorizedException extends IOException {
1316
1317	}
1318
1319	private class SecurityException extends IOException {
1320
1321	}
1322
1323	private class IncompatibleServerException extends IOException {
1324
1325	}
1326
1327	private class DnsTimeoutException extends IOException {
1328
1329	}
1330	public enum Identity {
1331		FACEBOOK,
1332		SLACK,
1333		EJABBERD,
1334		PROSODY,
1335		UNKNOWN
1336	}
1337
1338	public class Features {
1339		XmppConnection connection;
1340		private boolean carbonsEnabled = false;
1341		private boolean encryptionEnabled = false;
1342		private boolean blockListRequested = false;
1343
1344		public Features(final XmppConnection connection) {
1345			this.connection = connection;
1346		}
1347
1348		private boolean hasDiscoFeature(final Jid server, final String feature) {
1349			synchronized (XmppConnection.this.disco) {
1350				return connection.disco.containsKey(server) &&
1351						connection.disco.get(server).features.contains(feature);
1352			}
1353		}
1354
1355		public boolean carbons() {
1356			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1357		}
1358
1359		public boolean blocking() {
1360			return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1361		}
1362
1363		public boolean register() {
1364			return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1365		}
1366
1367		public boolean sm() {
1368			return streamId != null
1369					|| (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1370		}
1371
1372		public boolean csi() {
1373			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1374		}
1375
1376		public boolean pep() {
1377			synchronized (XmppConnection.this.disco) {
1378				final Pair<String, String> needle = new Pair<>("pubsub", "pep");
1379				Info info = disco.get(account.getServer());
1380				if (info != null && info.identities.contains(needle)) {
1381					return true;
1382				} else {
1383					info = disco.get(account.getJid().toBareJid());
1384					return info != null && info.identities.contains(needle);
1385				}
1386			}
1387		}
1388
1389		public boolean mam() {
1390			if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1391				return true;
1392			} else {
1393				return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1394			}
1395		}
1396
1397		public boolean advancedStreamFeaturesLoaded() {
1398			synchronized (XmppConnection.this.disco) {
1399				return disco.containsKey(account.getServer());
1400			}
1401		}
1402
1403		public boolean rosterVersioning() {
1404			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1405		}
1406
1407		public void setBlockListRequested(boolean value) {
1408			this.blockListRequested = value;
1409		}
1410
1411		public boolean httpUpload() {
1412			return !Config.DISABLE_HTTP_UPLOAD && findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1413		}
1414	}
1415
1416	private IqGenerator getIqGenerator() {
1417		return mXmppConnectionService.getIqGenerator();
1418	}
1419}