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