renaming eu.siacs.conversations to de.thedevstack.conversationsplus

 "renaming eu.siacs.conversations to de.thedevstack.conversationsplus"

package renaming completed

1 files changed, 1125 insertions, 0 deletions

diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
new file mode 100644
index 00000000..039d8375
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
@@ -0,0 +1,1125 @@
+package de.thedevstack.conversationsplus.xmpp;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.os.Parcelable;
+import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
+import android.os.SystemClock;
+import android.preference.PreferenceManager;
+import android.util.Log;
+import android.util.Pair;
+import android.util.SparseArray;
+
+import org.apache.http.conn.ssl.StrictHostnameVerifier;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.math.BigInteger;
+import java.net.ConnectException;
+import java.net.IDN;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.security.KeyManagementException;
+import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocket;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.X509TrustManager;
+
+import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.crypto.sasl.DigestMd5;
+import de.thedevstack.conversationsplus.crypto.sasl.Plain;
+import de.thedevstack.conversationsplus.crypto.sasl.SaslMechanism;
+import de.thedevstack.conversationsplus.crypto.sasl.ScramSha1;
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.generator.IqGenerator;
+import de.thedevstack.conversationsplus.services.XmppConnectionService;
+import de.thedevstack.conversationsplus.utils.CryptoHelper;
+import de.thedevstack.conversationsplus.utils.DNSHelper;
+import de.thedevstack.conversationsplus.utils.Xmlns;
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xml.Tag;
+import de.thedevstack.conversationsplus.xml.TagWriter;
+import de.thedevstack.conversationsplus.xml.XmlReader;
+import de.thedevstack.conversationsplus.xmpp.jid.InvalidJidException;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.xmpp.jingle.OnJinglePacketReceived;
+import de.thedevstack.conversationsplus.xmpp.jingle.stanzas.JinglePacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.AbstractStanza;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.MessagePacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.PresencePacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.csi.ActivePacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.csi.InactivePacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.streammgmt.AckPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.streammgmt.EnablePacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.streammgmt.RequestPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.streammgmt.ResumePacket;
+
+public class XmppConnection implements Runnable {
+
+	private static final int PACKET_IQ = 0;
+	private static final int PACKET_MESSAGE = 1;
+	private static final int PACKET_PRESENCE = 2;
+	private final Context applicationContext;
+	protected Account account;
+	private final WakeLock wakeLock;
+	private Socket socket;
+	private XmlReader tagReader;
+	private TagWriter tagWriter;
+	private final Features features = new Features(this);
+	private boolean shouldBind = true;
+	private boolean shouldAuthenticate = true;
+	private Element streamFeatures;
+	private final HashMap<String, List<String>> disco = new HashMap<>();
+
+	private String streamId = null;
+	private int smVersion = 3;
+	private final SparseArray<String> messageReceipts = new SparseArray<>();
+
+	private int stanzasReceived = 0;
+	private int stanzasSent = 0;
+	private long lastPacketReceived = 0;
+	private long lastPingSent = 0;
+	private long lastConnect = 0;
+	private long lastSessionStarted = 0;
+	private int attempt = 0;
+	private final Map<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
+	private OnPresencePacketReceived presenceListener = null;
+	private OnJinglePacketReceived jingleListener = null;
+	private OnIqPacketReceived unregisteredIqListener = null;
+	private OnMessagePacketReceived messageListener = null;
+	private OnStatusChanged statusListener = null;
+	private OnBindListener bindListener = null;
+	private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
+	private OnMessageAcknowledged acknowledgedListener = null;
+	private XmppConnectionService mXmppConnectionService = null;
+
+	private SaslMechanism saslMechanism;
+
+	public XmppConnection(final Account account, final XmppConnectionService service) {
+		this.account = account;
+		this.wakeLock = service.getPowerManager().newWakeLock(
+				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
+		tagWriter = new TagWriter();
+		mXmppConnectionService = service;
+		applicationContext = service.getApplicationContext();
+	}
+
+	protected void changeStatus(final Account.State nextStatus) {
+		if (account.getStatus() != nextStatus) {
+			if ((nextStatus == Account.State.OFFLINE)
+					&& (account.getStatus() != Account.State.CONNECTING)
+					&& (account.getStatus() != Account.State.ONLINE)
+					&& (account.getStatus() != Account.State.DISABLED)) {
+				return;
+					}
+			if (nextStatus == Account.State.ONLINE) {
+				this.attempt = 0;
+			}
+			account.setStatus(nextStatus);
+			if (statusListener != null) {
+				statusListener.onStatusChanged(account);
+			}
+		}
+	}
+
+	protected void connect() {
+		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
+		features.encryptionEnabled = false;
+		lastConnect = SystemClock.elapsedRealtime();
+		lastPingSent = SystemClock.elapsedRealtime();
+		this.attempt++;
+		try {
+			shouldAuthenticate = shouldBind = !account.isOptionSet(Account.OPTION_REGISTER);
+			tagReader = new XmlReader(wakeLock);
+			tagWriter = new TagWriter();
+			packetCallbacks.clear();
+			this.changeStatus(Account.State.CONNECTING);
+			final Bundle result = DNSHelper.getSRVRecord(account.getServer());
+			final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
+			if ("timeout".equals(result.getString("error"))) {
+				throw new IOException("timeout in dns");
+			} else if (values != null) {
+				int i = 0;
+				boolean socketError = true;
+				while (socketError && values.size() > i) {
+					final Bundle namePort = (Bundle) values.get(i);
+					try {
+						String srvRecordServer;
+						try {
+							srvRecordServer=IDN.toASCII(namePort.getString("name"));
+						} catch (final IllegalArgumentException e) {
+							// TODO: Handle me?`
+							srvRecordServer = "";
+						}
+						final int srvRecordPort = namePort.getInt("port");
+						final String srvIpServer = namePort.getString("ip");
+						final InetSocketAddress addr;
+						if (srvIpServer != null) {
+							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
+							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
+									+ ": using values from dns " + srvRecordServer
+									+ "[" + srvIpServer + "]:" + srvRecordPort);
+						} else {
+							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
+							Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
+									+ ": using values from dns "
+									+ srvRecordServer + ":" + srvRecordPort);
+						}
+						socket = new Socket();
+						socket.connect(addr, 20000);
+						socketError = false;
+					} catch (final UnknownHostException e) {
+						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
+						i++;
+					} catch (final IOException e) {
+						Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
+						i++;
+					}
+				}
+				if (socketError) {
+					throw new UnknownHostException();
+				}
+			} else if (result.containsKey("error")
+					&& "nosrv".equals(result.getString("error", null))) {
+				socket = new Socket(account.getServer().getDomainpart(), 5222);
+			} else {
+				throw new IOException("timeout in dns");
+			}
+			final OutputStream out = socket.getOutputStream();
+			tagWriter.setOutputStream(out);
+			final InputStream in = socket.getInputStream();
+			tagReader.setInputStream(in);
+			tagWriter.beginDocument();
+			sendStartStream();
+			Tag nextTag;
+			while ((nextTag = tagReader.readTag()) != null) {
+				if (nextTag.isStart("stream")) {
+					processStream(nextTag);
+					break;
+				} else {
+					throw new IOException("unknown tag on connect");
+				}
+			}
+			if (socket.isConnected()) {
+				socket.close();
+			}
+		} catch (final UnknownHostException | ConnectException e) {
+			this.changeStatus(Account.State.SERVER_NOT_FOUND);
+		} catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
+			Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
+			this.changeStatus(Account.State.OFFLINE);
+			this.attempt--; //don't count attempt when reconnecting instantly anyway
+		} finally {
+			if (wakeLock.isHeld()) {
+				try {
+					wakeLock.release();
+				} catch (final RuntimeException ignored) {
+				}
+			}
+		}
+	}
+
+	@Override
+	public void run() {
+		try {
+			if (socket != null) {
+				socket.close();
+			}
+		} catch (final IOException ignored) {
+
+		}
+		connect();
+	}
+
+	private void processStream(final Tag currentTag) throws XmlPullParserException,
+					IOException, NoSuchAlgorithmException {
+						Tag nextTag = tagReader.readTag();
+
+						while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
+							if (nextTag.isStart("error")) {
+								processStreamError(nextTag);
+							} else if (nextTag.isStart("features")) {
+								processStreamFeatures(nextTag);
+							} else if (nextTag.isStart("proceed")) {
+								switchOverToTls(nextTag);
+							} else if (nextTag.isStart("success")) {
+								final String challenge = tagReader.readElement(nextTag).getContent();
+								try {
+									saslMechanism.getResponse(challenge);
+								} catch (final SaslMechanism.AuthenticationException e) {
+									disconnect(true);
+									Log.e(Config.LOGTAG, String.valueOf(e));
+								}
+								Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
+								account.setKey(Account.PINNED_MECHANISM_KEY,
+										String.valueOf(saslMechanism.getPriority()));
+								tagReader.reset();
+								sendStartStream();
+								processStream(tagReader.readTag());
+								break;
+							} else if (nextTag.isStart("failure")) {
+								tagReader.readElement(nextTag);
+								changeStatus(Account.State.UNAUTHORIZED);
+							} else if (nextTag.isStart("challenge")) {
+								final String challenge = tagReader.readElement(nextTag).getContent();
+								final Element response = new Element("response");
+								response.setAttribute("xmlns",
+										"urn:ietf:params:xml:ns:xmpp-sasl");
+								try {
+									response.setContent(saslMechanism.getResponse(challenge));
+								} catch (final SaslMechanism.AuthenticationException e) {
+									// TODO: Send auth abort tag.
+									Log.e(Config.LOGTAG, e.toString());
+								}
+								tagWriter.writeElement(response);
+							} else if (nextTag.isStart("enabled")) {
+								final Element enabled = tagReader.readElement(nextTag);
+								if ("true".equals(enabled.getAttribute("resume"))) {
+									this.streamId = enabled.getAttribute("id");
+									Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
+											+ ": stream managment(" + smVersion
+											+ ") enabled (resumable)");
+								} else {
+									Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
+											+ ": stream managment(" + smVersion + ") enabled");
+								}
+								this.lastSessionStarted = SystemClock.elapsedRealtime();
+								this.stanzasReceived = 0;
+								final RequestPacket r = new RequestPacket(smVersion);
+								tagWriter.writeStanzaAsync(r);
+							} else if (nextTag.isStart("resumed")) {
+								lastPacketReceived = SystemClock.elapsedRealtime();
+								final Element resumed = tagReader.readElement(nextTag);
+								final String h = resumed.getAttribute("h");
+								try {
+									final int serverCount = Integer.parseInt(h);
+									if (serverCount != stanzasSent) {
+										Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
+												+ ": session resumed with lost packages");
+										stanzasSent = serverCount;
+									} else {
+										Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
+												+ ": session resumed");
+									}
+									if (acknowledgedListener != null) {
+										for (int i = 0; i < messageReceipts.size(); ++i) {
+											if (serverCount >= messageReceipts.keyAt(i)) {
+												acknowledgedListener.onMessageAcknowledged(
+														account, messageReceipts.valueAt(i));
+											}
+										}
+									}
+									messageReceipts.clear();
+								} catch (final NumberFormatException ignored) {
+								}
+								sendServiceDiscoveryInfo(account.getServer());
+								sendServiceDiscoveryItems(account.getServer());
+								sendInitialPing();
+							} else if (nextTag.isStart("r")) {
+								tagReader.readElement(nextTag);
+								final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
+								tagWriter.writeStanzaAsync(ack);
+							} else if (nextTag.isStart("a")) {
+								final Element ack = tagReader.readElement(nextTag);
+								lastPacketReceived = SystemClock.elapsedRealtime();
+								final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
+								final String msgId = this.messageReceipts.get(serverSequence);
+								if (msgId != null) {
+									if (this.acknowledgedListener != null) {
+										this.acknowledgedListener.onMessageAcknowledged(
+												account, msgId);
+									}
+									this.messageReceipts.remove(serverSequence);
+								}
+							} else if (nextTag.isStart("failed")) {
+								tagReader.readElement(nextTag);
+								Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
+								streamId = null;
+								if (account.getStatus() != Account.State.ONLINE) {
+									sendBindRequest();
+								}
+							} else if (nextTag.isStart("iq")) {
+								processIq(nextTag);
+							} else if (nextTag.isStart("message")) {
+								processMessage(nextTag);
+							} else if (nextTag.isStart("presence")) {
+								processPresence(nextTag);
+							}
+							nextTag = tagReader.readTag();
+						}
+						if (account.getStatus() == Account.State.ONLINE) {
+							account. setStatus(Account.State.OFFLINE);
+							if (statusListener != null) {
+								statusListener.onStatusChanged(account);
+							}
+						}
+	}
+
+	private void sendInitialPing() {
+		Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
+		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
+		iq.setFrom(account.getJid());
+		iq.addChild("ping", "urn:xmpp:ping");
+		this.sendIqPacket(iq, new OnIqPacketReceived() {
+			@Override
+			public void onIqPacketReceived(final Account account, final IqPacket packet) {
+				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
+						+ ": online with resource " + account.getResource());
+				changeStatus(Account.State.ONLINE);
+			}
+		});
+	}
+
+	private Element processPacket(final Tag currentTag, final int packetType)
+		throws XmlPullParserException, IOException {
+		Element element;
+		switch (packetType) {
+			case PACKET_IQ:
+				element = new IqPacket();
+				break;
+			case PACKET_MESSAGE:
+				element = new MessagePacket();
+				break;
+			case PACKET_PRESENCE:
+				element = new PresencePacket();
+				break;
+			default:
+				return null;
+		}
+		element.setAttributes(currentTag.getAttributes());
+		Tag nextTag = tagReader.readTag();
+		if (nextTag == null) {
+			throw new IOException("interrupted mid tag");
+		}
+		while (!nextTag.isEnd(element.getName())) {
+			if (!nextTag.isNo()) {
+				final Element child = tagReader.readElement(nextTag);
+				final String type = currentTag.getAttribute("type");
+				if (packetType == PACKET_IQ
+						&& "jingle".equals(child.getName())
+						&& ("set".equalsIgnoreCase(type) || "get"
+							.equalsIgnoreCase(type))) {
+					element = new JinglePacket();
+					element.setAttributes(currentTag.getAttributes());
+							}
+				element.addChild(child);
+			}
+			nextTag = tagReader.readTag();
+			if (nextTag == null) {
+				throw new IOException("interrupted mid tag");
+			}
+		}
+		++stanzasReceived;
+		lastPacketReceived = SystemClock.elapsedRealtime();
+		return element;
+	}
+
+	private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
+		final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
+
+		if (packet.getId() == null) {
+			return; // an iq packet without id is definitely invalid
+		}
+
+		if (packet instanceof JinglePacket) {
+			if (this.jingleListener != null) {
+				this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
+			}
+		} else {
+			if (packetCallbacks.containsKey(packet.getId())) {
+				final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
+				// Packets to the server should have responses from the server
+				if (packetCallbackDuple.first.toServer(account)) {
+					if (packet.fromServer(account)) {
+						packetCallbackDuple.second.onIqPacketReceived(account, packet);
+						packetCallbacks.remove(packet.getId());
+					} else {
+						Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
+					}
+				} else {
+					if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
+						packetCallbackDuple.second.onIqPacketReceived(account, packet);
+						packetCallbacks.remove(packet.getId());
+					} else {
+						Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
+					}
+				}
+			} else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
+				this.unregisteredIqListener.onIqPacketReceived(account, packet);
+			}
+		}
+	}
+
+	private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
+		final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
+		this.messageListener.onMessagePacketReceived(account, packet);
+	}
+
+	private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
+		PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
+		this.presenceListener.onPresencePacketReceived(account, packet);
+	}
+
+	private void sendStartTLS() throws IOException {
+		final Tag startTLS = Tag.empty("starttls");
+		startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
+		tagWriter.writeTag(startTLS);
+	}
+
+	private SharedPreferences getPreferences() {
+		return PreferenceManager.getDefaultSharedPreferences(applicationContext);
+	}
+
+	private boolean enableLegacySSL() {
+		return getPreferences().getBoolean("enable_legacy_ssl", false);
+	}
+
+	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
+		tagReader.readTag();
+		try {
+			final SSLContext sc = SSLContext.getInstance("TLS");
+			sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
+			final SSLSocketFactory factory = sc.getSocketFactory();
+			final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
+			final InetAddress address = socket == null ? null : socket.getInetAddress();
+
+			if (factory == null || address == null || verifier == null) {
+				throw new IOException("could not setup ssl");
+			}
+
+			final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
+
+			if (sslSocket == null) {
+				throw new IOException("could not initialize ssl socket");
+			}
+
+			final String[] supportProtocols;
+			final Collection<String> supportedProtocols = new LinkedList<>(
+					Arrays.asList(sslSocket.getSupportedProtocols()));
+			supportedProtocols.remove("SSLv3");
+			supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
+
+			sslSocket.setEnabledProtocols(supportProtocols);
+
+			final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
+					sslSocket.getSupportedCipherSuites());
+			//Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
+			if (cipherSuites.length > 0) {
+				sslSocket.setEnabledCipherSuites(cipherSuites);
+			}
+
+			if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
+				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
+				disconnect(true);
+				changeStatus(Account.State.SECURITY_ERROR);
+			}
+			tagReader.setInputStream(sslSocket.getInputStream());
+			tagWriter.setOutputStream(sslSocket.getOutputStream());
+			sendStartStream();
+			Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
+			features.encryptionEnabled = true;
+			processStream(tagReader.readTag());
+			sslSocket.close();
+		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
+			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
+			disconnect(true);
+			changeStatus(Account.State.SECURITY_ERROR);
+		}
+	}
+
+	private void processStreamFeatures(final Tag currentTag)
+		throws XmlPullParserException, IOException {
+		this.streamFeatures = tagReader.readElement(currentTag);
+		if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
+			sendStartTLS();
+		} else if (this.streamFeatures.hasChild("register")
+				&& account.isOptionSet(Account.OPTION_REGISTER)
+				&& features.encryptionEnabled) {
+			sendRegistryRequest();
+		} else if (!this.streamFeatures.hasChild("register")
+				&& account.isOptionSet(Account.OPTION_REGISTER)) {
+			changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
+			disconnect(true);
+		} else if (this.streamFeatures.hasChild("mechanisms")
+				&& shouldAuthenticate && features.encryptionEnabled) {
+			final List<String> mechanisms = extractMechanisms(streamFeatures
+					.findChild("mechanisms"));
+			final Element auth = new Element("auth");
+			auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
+			if (mechanisms.contains("SCRAM-SHA-1")) {
+				saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
+			} else if (mechanisms.contains("PLAIN")) {
+				saslMechanism = new Plain(tagWriter, account);
+			} else if (mechanisms.contains("DIGEST-MD5")) {
+				saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
+			}
+			final JSONObject keys = account.getKeys();
+			try {
+				if (keys.has(Account.PINNED_MECHANISM_KEY) &&
+						keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority() ) {
+					Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
+							" has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
+							") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
+							"). Possible downgrade attack?");
+					disconnect(true);
+					changeStatus(Account.State.SECURITY_ERROR);
+						}
+			} catch (final JSONException e) {
+				Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
+			}
+			Log.d(Config.LOGTAG,account.getJid().toString()+": Authenticating with " + saslMechanism.getMechanism());
+			auth.setAttribute("mechanism", saslMechanism.getMechanism());
+			if (!saslMechanism.getClientFirstMessage().isEmpty()) {
+				auth.setContent(saslMechanism.getClientFirstMessage());
+			}
+			tagWriter.writeElement(auth);
+		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
+					+ smVersion)
+				&& streamId != null) {
+			final ResumePacket resume = new ResumePacket(this.streamId,
+					stanzasReceived, smVersion);
+			this.tagWriter.writeStanzaAsync(resume);
+		} else if (this.streamFeatures.hasChild("bind") && shouldBind) {
+			sendBindRequest();
+		} else {
+			disconnect(true);
+			changeStatus(Account.State.INCOMPATIBLE_SERVER);
+		}
+	}
+
+	private List<String> extractMechanisms(final Element stream) {
+		final ArrayList<String> mechanisms = new ArrayList<>(stream
+				.getChildren().size());
+		for (final Element child : stream.getChildren()) {
+			mechanisms.add(child.getContent());
+		}
+		return mechanisms;
+	}
+
+	private void sendRegistryRequest() {
+		final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
+		register.query("jabber:iq:register");
+		register.setTo(account.getServer());
+		sendIqPacket(register, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(final Account account, final IqPacket packet) {
+				final Element instructions = packet.query().findChild("instructions");
+				if (packet.query().hasChild("username")
+						&& (packet.query().hasChild("password"))) {
+					final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
+					final Element username = new Element("username")
+						.setContent(account.getUsername());
+					final Element password = new Element("password")
+						.setContent(account.getPassword());
+					register.query("jabber:iq:register").addChild(username);
+					register.query().addChild(password);
+					sendIqPacket(register, new OnIqPacketReceived() {
+
+						@Override
+						public void onIqPacketReceived(final Account account, final IqPacket packet) {
+							if (packet.getType() == IqPacket.TYPE.RESULT) {
+								account.setOption(Account.OPTION_REGISTER,
+										false);
+								changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
+							} else if (packet.hasChild("error")
+									&& (packet.findChild("error")
+										.hasChild("conflict"))) {
+								changeStatus(Account.State.REGISTRATION_CONFLICT);
+							} else {
+								changeStatus(Account.State.REGISTRATION_FAILED);
+								Log.d(Config.LOGTAG, packet.toString());
+							}
+							disconnect(true);
+						}
+					});
+				} else {
+					changeStatus(Account.State.REGISTRATION_FAILED);
+					disconnect(true);
+					Log.d(Config.LOGTAG, account.getJid().toBareJid()
+							+ ": could not register. instructions are"
+							+ instructions.getContent());
+				}
+			}
+		});
+	}
+
+	private void sendBindRequest() {
+		while(!mXmppConnectionService.areMessagesInitialized()) {
+			try {
+				Thread.sleep(500);
+			} catch (final InterruptedException ignored) {
+			}
+		}
+		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
+		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
+			.addChild("resource").setContent(account.getResource());
+		this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
+			@Override
+			public void onIqPacketReceived(final Account account, final IqPacket packet) {
+				final Element bind = packet.findChild("bind");
+				if (bind != null) {
+					final Element jid = bind.findChild("jid");
+					if (jid != null && jid.getContent() != null) {
+						try {
+							account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
+						} catch (final InvalidJidException e) {
+							// TODO: Handle the case where an external JID is technically invalid?
+						}
+						if (streamFeatures.hasChild("session")) {
+							sendStartSession();
+						} else {
+							sendPostBindInitialization();
+						}
+					} else {
+						disconnect(true);
+					}
+				} else {
+					disconnect(true);
+				}
+			}
+		});
+	}
+
+	private void sendStartSession() {
+		final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
+		startSession.addChild("session","urn:ietf:params:xml:ns:xmpp-session");
+		this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
+			@Override
+			public void onIqPacketReceived(Account account, IqPacket packet) {
+				if (packet.getType() == IqPacket.TYPE.RESULT) {
+					sendPostBindInitialization();
+				} else {
+					disconnect(true);
+				}
+			}
+		});
+	}
+
+	private void sendPostBindInitialization() {
+		smVersion = 0;
+		if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
+			smVersion = 3;
+		} else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
+			smVersion = 2;
+		}
+		if (smVersion != 0) {
+			final EnablePacket enable = new EnablePacket(smVersion);
+			tagWriter.writeStanzaAsync(enable);
+			stanzasSent = 0;
+			messageReceipts.clear();
+		}
+		features.carbonsEnabled = false;
+		features.blockListRequested = false;
+		disco.clear();
+		sendServiceDiscoveryInfo(account.getServer());
+		sendServiceDiscoveryItems(account.getServer());
+		if (bindListener != null) {
+			bindListener.onBind(account);
+		}
+		sendInitialPing();
+	}
+
+	private void sendServiceDiscoveryInfo(final Jid server) {
+		if (disco.containsKey(server.toDomainJid().toString())) {
+			if (account.getServer().equals(server.toDomainJid())) {
+				enableAdvancedStreamFeatures();
+			}
+		} else {
+			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
+			iq.setTo(server.toDomainJid());
+			iq.query("http://jabber.org/protocol/disco#info");
+			this.sendIqPacket(iq, new OnIqPacketReceived() {
+
+				@Override
+				public void onIqPacketReceived(final Account account, final IqPacket packet) {
+					final List<Element> elements = packet.query().getChildren();
+					final List<String> features = new ArrayList<>();
+					for (final Element element : elements) {
+						if (element.getName().equals("identity")) {
+							if ("irc".equals(element.getAttribute("type"))) {
+								//add fake feature to not confuse irc and real muc
+								features.add("siacs:no:muc");
+							}
+						} else if (element.getName().equals("feature")) {
+							features.add(element.getAttribute("var"));
+						}
+					}
+					disco.put(server.toDomainJid().toString(), features);
+
+					if (account.getServer().equals(server.toDomainJid())) {
+						enableAdvancedStreamFeatures();
+						for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
+							listener.onAdvancedStreamFeaturesAvailable(account);
+						}
+					}
+				}
+			});
+		}
+	}
+
+	private void enableAdvancedStreamFeatures() {
+		if (getFeatures().carbons() && !features.carbonsEnabled) {
+			sendEnableCarbons();
+		}
+		if (getFeatures().blocking() && !features.blockListRequested) {
+			Log.d(Config.LOGTAG, "Requesting block list");
+			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
+		}
+	}
+
+	private void sendServiceDiscoveryItems(final Jid server) {
+		final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
+		iq.setTo(server.toDomainJid());
+		iq.query("http://jabber.org/protocol/disco#items");
+		this.sendIqPacket(iq, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(final Account account, final IqPacket packet) {
+				final List<Element> elements = packet.query().getChildren();
+				for (final Element element : elements) {
+					if (element.getName().equals("item")) {
+						final Jid jid = element.getAttributeAsJid("jid");
+						if (jid != null && !jid.equals(account.getServer())) {
+							sendServiceDiscoveryInfo(jid);
+						}
+					}
+				}
+			}
+		});
+	}
+
+	private void sendEnableCarbons() {
+		final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
+		iq.addChild("enable", "urn:xmpp:carbons:2");
+		this.sendIqPacket(iq, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(final Account account, final IqPacket packet) {
+				if (!packet.hasChild("error")) {
+					Log.d(Config.LOGTAG, account.getJid().toBareJid()
+							+ ": successfully enabled carbons");
+					features.carbonsEnabled = true;
+				} else {
+					Log.d(Config.LOGTAG, account.getJid().toBareJid()
+							+ ": error enableing carbons " + packet.toString());
+				}
+			}
+		});
+	}
+
+	private void processStreamError(final Tag currentTag)
+		throws XmlPullParserException, IOException {
+		final Element streamError = tagReader.readElement(currentTag);
+		if (streamError != null && streamError.hasChild("conflict")) {
+			final String resource = account.getResource().split("\\.")[0];
+			account.setResource(resource + "." + nextRandomId());
+			Log.d(Config.LOGTAG,
+					account.getJid().toBareJid() + ": switching resource due to conflict ("
+					+ account.getResource() + ")");
+		}
+	}
+
+	private void sendStartStream() throws IOException {
+		final Tag stream = Tag.start("stream:stream");
+		stream.setAttribute("from", account.getJid().toBareJid().toString());
+		stream.setAttribute("to", account.getServer().toString());
+		stream.setAttribute("version", "1.0");
+		stream.setAttribute("xml:lang", "en");
+		stream.setAttribute("xmlns", "jabber:client");
+		stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
+		tagWriter.writeTag(stream);
+	}
+
+	private String nextRandomId() {
+		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
+	}
+
+	public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
+		packet.setFrom(account.getJid());
+		this.sendUnmodifiedIqPacket(packet,callback);
+
+	}
+
+	private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
+		if (packet.getId() == null) {
+			final String id = nextRandomId();
+			packet.setAttribute("id", id);
+		}
+		if (callback != null) {
+			if (packet.getId() == null) {
+				packet.setId(nextRandomId());
+			}
+			packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
+		}
+		this.sendPacket(packet);
+	}
+
+	public void sendMessagePacket(final MessagePacket packet) {
+		this.sendPacket(packet);
+	}
+
+	public void sendPresencePacket(final PresencePacket packet) {
+		this.sendPacket(packet);
+	}
+
+	private synchronized void sendPacket(final AbstractStanza packet) {
+		final String name = packet.getName();
+		if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
+			++stanzasSent;
+		}
+		tagWriter.writeStanzaAsync(packet);
+		if (packet instanceof MessagePacket && packet.getId() != null && this.streamId != null) {
+			Log.d(Config.LOGTAG, "request delivery report for stanza " + stanzasSent);
+			this.messageReceipts.put(stanzasSent, packet.getId());
+			tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
+		}
+	}
+
+	public void sendPing() {
+		if (streamFeatures.hasChild("sm")) {
+			tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
+		} else {
+			final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
+			iq.setFrom(account.getJid());
+			iq.addChild("ping", "urn:xmpp:ping");
+			this.sendIqPacket(iq, null);
+		}
+		this.lastPingSent = SystemClock.elapsedRealtime();
+	}
+
+	public void setOnMessagePacketReceivedListener(
+			final OnMessagePacketReceived listener) {
+		this.messageListener = listener;
+			}
+
+	public void setOnUnregisteredIqPacketReceivedListener(
+			final OnIqPacketReceived listener) {
+		this.unregisteredIqListener = listener;
+			}
+
+	public void setOnPresencePacketReceivedListener(
+			final OnPresencePacketReceived listener) {
+		this.presenceListener = listener;
+			}
+
+	public void setOnJinglePacketReceivedListener(
+			final OnJinglePacketReceived listener) {
+		this.jingleListener = listener;
+			}
+
+	public void setOnStatusChangedListener(final OnStatusChanged listener) {
+		this.statusListener = listener;
+	}
+
+	public void setOnBindListener(final OnBindListener listener) {
+		this.bindListener = listener;
+	}
+
+	public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
+		this.acknowledgedListener = listener;
+	}
+
+	public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
+		if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
+			this.advancedStreamFeaturesLoadedListeners.add(listener);
+		}
+	}
+
+	public void disconnect(final boolean force) {
+		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
+		try {
+			if (force) {
+				socket.close();
+				return;
+			}
+			new Thread(new Runnable() {
+
+				@Override
+				public void run() {
+					if (tagWriter.isActive()) {
+						tagWriter.finish();
+						try {
+							while (!tagWriter.finished()) {
+								Log.d(Config.LOGTAG, "not yet finished");
+								Thread.sleep(100);
+							}
+							tagWriter.writeTag(Tag.end("stream:stream"));
+							socket.close();
+						} catch (final IOException e) {
+							Log.d(Config.LOGTAG,
+									"io exception during disconnect");
+						} catch (final InterruptedException e) {
+							Log.d(Config.LOGTAG, "interrupted");
+						}
+					}
+				}
+			}).start();
+		} catch (final IOException e) {
+			Log.d(Config.LOGTAG, "io exception during disconnect");
+		}
+	}
+
+	public List<String> findDiscoItemsByFeature(final String feature) {
+		final List<String> items = new ArrayList<>();
+		for (final Entry<String, List<String>> cursor : disco.entrySet()) {
+			if (cursor.getValue().contains(feature)) {
+				items.add(cursor.getKey());
+			}
+		}
+		return items;
+	}
+
+	public String findDiscoItemByFeature(final String feature) {
+		final List<String> items = findDiscoItemsByFeature(feature);
+		if (items.size() >= 1) {
+			return items.get(0);
+		}
+		return null;
+	}
+
+	public void r() {
+		this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
+	}
+
+	public String getMucServer() {
+		for (final Entry<String, List<String>> cursor : disco.entrySet()) {
+			final List<String> value = cursor.getValue();
+			if (value.contains("http://jabber.org/protocol/muc") && !value.contains("jabber:iq:gateway") && !value.contains("siacs:no:muc")) {
+				return cursor.getKey();
+			}
+		}
+		return null;
+	}
+
+	public int getTimeToNextAttempt() {
+		final int interval = (int) (25 * Math.pow(1.5, attempt));
+		final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
+		return interval - secondsSinceLast;
+	}
+
+	public int getAttempt() {
+		return this.attempt;
+	}
+
+	public Features getFeatures() {
+		return this.features;
+	}
+
+	public long getLastSessionEstablished() {
+		final long diff;
+		if (this.lastSessionStarted == 0) {
+			diff = SystemClock.elapsedRealtime() - this.lastConnect;
+		} else {
+			diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
+		}
+		return System.currentTimeMillis() - diff;
+	}
+
+	public long getLastConnect() {
+		return this.lastConnect;
+	}
+
+	public long getLastPingSent() {
+		return this.lastPingSent;
+	}
+
+	public long getLastPacketReceived() {
+		return this.lastPacketReceived;
+	}
+
+	public void sendActive() {
+		this.sendPacket(new ActivePacket());
+	}
+
+	public void sendInactive() {
+		this.sendPacket(new InactivePacket());
+	}
+
+	public void resetAttemptCount() {
+		this.attempt = 0;
+		this.lastConnect = 0;
+	}
+
+	public class Features {
+		XmppConnection connection;
+		private boolean carbonsEnabled = false;
+		private boolean encryptionEnabled = false;
+		private boolean blockListRequested = false;
+
+		public Features(final XmppConnection connection) {
+			this.connection = connection;
+		}
+
+		private boolean hasDiscoFeature(final Jid server, final String feature) {
+			return connection.disco.containsKey(server.toDomainJid().toString()) &&
+				connection.disco.get(server.toDomainJid().toString()).contains(feature);
+		}
+
+		public boolean carbons() {
+			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
+		}
+
+		public boolean blocking() {
+			return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
+		}
+
+		public boolean register() {
+			return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
+		}
+
+		public boolean sm() {
+			return streamId != null;
+		}
+
+		public boolean csi() {
+			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
+		}
+
+		public boolean pubsub() {
+			return hasDiscoFeature(account.getServer(),
+					"http://jabber.org/protocol/pubsub#publish");
+		}
+
+		public boolean mam() {
+			return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
+		}
+
+		public boolean advancedStreamFeaturesLoaded() {
+			return disco.containsKey(account.getServer().toString());
+		}
+
+		public boolean rosterVersioning() {
+			return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
+		}
+
+		public void setBlockListRequested(boolean value) {
+			this.blockListRequested = value;
+		}
+	}
+
+	private IqGenerator getIqGenerator() {
+		return mXmppConnectionService.getIqGenerator();
+	}
+}