Merge pull request #600 from SamWhited/gradle

Build system and library changes (Gradle / Subtree merging)

1 files changed, 1129 insertions, 0 deletions

diff --git a/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
new file mode 100644
index 00000000..39dcb362
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
@@ -0,0 +1,1129 @@
+package eu.siacs.conversations.xmpp;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.math.BigInteger;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.security.KeyManagementException;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.LinkedList;
+import java.util.List;
+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 org.apache.http.conn.ssl.StrictHostnameVerifier;
+import org.xmlpull.v1.XmlPullParserException;
+
+import de.duenndns.ssl.MemorizingTrustManager;
+
+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.SparseArray;
+import eu.siacs.conversations.Config;
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.services.XmppConnectionService;
+import eu.siacs.conversations.utils.CryptoHelper;
+import eu.siacs.conversations.utils.DNSHelper;
+import eu.siacs.conversations.utils.zlib.ZLibOutputStream;
+import eu.siacs.conversations.utils.zlib.ZLibInputStream;
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xml.Tag;
+import eu.siacs.conversations.xml.TagWriter;
+import eu.siacs.conversations.xml.XmlReader;
+import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
+import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
+import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
+import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
+import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
+
+public class XmppConnection implements Runnable {
+
+	protected Account account;
+
+	private WakeLock wakeLock;
+
+	private SecureRandom mRandom;
+
+	private Socket socket;
+	private XmlReader tagReader;
+	private TagWriter tagWriter;
+
+	private Features features = new Features(this);
+
+	private boolean shouldBind = true;
+	private boolean shouldAuthenticate = true;
+	private Element streamFeatures;
+	private HashMap<String, List<String>> disco = new HashMap<String, List<String>>();
+
+	private String streamId = null;
+	private int smVersion = 3;
+	private SparseArray<String> messageReceipts = new SparseArray<String>();
+
+	private boolean usingCompression = false;
+	private boolean usingEncryption = false;
+
+	private int stanzasReceived = 0;
+	private int stanzasSent = 0;
+
+	private long lastPaketReceived = 0;
+	private long lastPingSent = 0;
+	private long lastConnect = 0;
+	private long lastSessionStarted = 0;
+
+	private int attempt = 0;
+
+	private static final int PACKET_IQ = 0;
+	private static final int PACKET_MESSAGE = 1;
+	private static final int PACKET_PRESENCE = 2;
+
+	private Hashtable<String, PacketReceived> packetCallbacks = new Hashtable<String, PacketReceived>();
+	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 OnMessageAcknowledged acknowledgedListener = null;
+	private MemorizingTrustManager mMemorizingTrustManager;
+	private final Context applicationContext;
+
+	public XmppConnection(Account account, XmppConnectionService service) {
+		this.mRandom = service.getRNG();
+		this.mMemorizingTrustManager = service.getMemorizingTrustManager();
+		this.account = account;
+		this.wakeLock = service.getPowerManager().newWakeLock(
+				PowerManager.PARTIAL_WAKE_LOCK, account.getJid());
+		tagWriter = new TagWriter();
+		applicationContext = service.getApplicationContext();
+	}
+
+	protected void changeStatus(int nextStatus) {
+		if (account.getStatus() != nextStatus) {
+			if ((nextStatus == Account.STATUS_OFFLINE)
+					&& (account.getStatus() != Account.STATUS_CONNECTING)
+					&& (account.getStatus() != Account.STATUS_ONLINE)
+					&& (account.getStatus() != Account.STATUS_DISABLED)) {
+				return;
+			}
+			if (nextStatus == Account.STATUS_ONLINE) {
+				this.attempt = 0;
+			}
+			account.setStatus(nextStatus);
+			if (statusListener != null) {
+				statusListener.onStatusChanged(account);
+			}
+		}
+	}
+
+	protected void connect() {
+		Log.d(Config.LOGTAG, account.getJid() + ": connecting");
+		usingCompression = false;
+		usingEncryption = 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.STATUS_CONNECTING);
+			Bundle result = DNSHelper.getSRVRecord(account.getServer());
+			ArrayList<Parcelable> values = result.getParcelableArrayList("values");
+			if ("timeout".equals(result.getString("error"))) {
+				Log.d(Config.LOGTAG, account.getJid() + ": dns timeout");
+				this.changeStatus(Account.STATUS_OFFLINE);
+				return;
+			} else if (values != null) {
+					int i = 0;
+					boolean socketError = true;
+					while (socketError && values.size() > i) {
+						Bundle namePort = (Bundle) values.get(i);
+						try {
+							String srvRecordServer = namePort.getString("name");
+							int srvRecordPort = namePort.getInt("port");
+							String srvIpServer = namePort.getString("ipv4");
+							InetSocketAddress addr;
+							if (srvIpServer!=null) {
+								addr = new InetSocketAddress(srvIpServer, srvRecordPort);
+								Log.d(Config.LOGTAG, account.getJid()
+										+ ": using values from dns " + srvRecordServer
+										+ "[" + srvIpServer + "]:" + srvRecordPort);
+							} else {
+								addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
+								Log.d(Config.LOGTAG, account.getJid()
+										+ ": using values from dns "
+										+ srvRecordServer + ":" + srvRecordPort);
+							}
+							socket = new Socket();
+							socket.connect(addr, 20000);
+							socketError = false;
+						} catch (UnknownHostException e) {
+							i++;
+						} catch (IOException e) {
+							i++;
+						}
+					}
+					if (socketError) {
+						throw new IOException();
+					}
+			} else if (result.containsKey("error")
+					&& "nosrv".equals(result.getString("error", null))) {
+				socket = new Socket(account.getServer(), 5222);
+			} else {
+				Log.d(Config.LOGTAG, account.getJid()
+						+ ": timeout in DNS resolution");
+				changeStatus(Account.STATUS_OFFLINE);
+				return;
+			}
+			OutputStream out = socket.getOutputStream();
+			tagWriter.setOutputStream(out);
+			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 {
+					Log.d(Config.LOGTAG,
+							"found unexpected tag: " + nextTag.getName());
+					return;
+				}
+			}
+			if (socket.isConnected()) {
+				socket.close();
+			}
+		} catch (UnknownHostException e) {
+			this.changeStatus(Account.STATUS_SERVER_NOT_FOUND);
+			if (wakeLock.isHeld()) {
+				try {
+					wakeLock.release();
+				} catch (RuntimeException re) {
+				}
+			}
+			return;
+		} catch (IOException e) {
+			this.changeStatus(Account.STATUS_OFFLINE);
+			if (wakeLock.isHeld()) {
+				try {
+					wakeLock.release();
+				} catch (RuntimeException re) {
+				}
+			}
+			return;
+		} catch (NoSuchAlgorithmException e) {
+			this.changeStatus(Account.STATUS_OFFLINE);
+			Log.d(Config.LOGTAG, "compression exception " + e.getMessage());
+			if (wakeLock.isHeld()) {
+				try {
+					wakeLock.release();
+				} catch (RuntimeException re) {
+				}
+			}
+			return;
+		} catch (XmlPullParserException e) {
+			this.changeStatus(Account.STATUS_OFFLINE);
+			Log.d(Config.LOGTAG, "xml exception " + e.getMessage());
+			if (wakeLock.isHeld()) {
+				try {
+					wakeLock.release();
+				} catch (RuntimeException re) {
+				}
+			}
+			return;
+		}
+
+	}
+
+	@Override
+	public void run() {
+		connect();
+	}
+
+	private void processStream(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("compressed")) {
+				switchOverToZLib(nextTag);
+			} else if (nextTag.isStart("success")) {
+				Log.d(Config.LOGTAG, account.getJid() + ": logged in");
+				tagReader.readTag();
+				tagReader.reset();
+				sendStartStream();
+				processStream(tagReader.readTag());
+				break;
+			} else if (nextTag.isStart("failure")) {
+				tagReader.readElement(nextTag);
+				changeStatus(Account.STATUS_UNAUTHORIZED);
+			} else if (nextTag.isStart("challenge")) {
+				String challange = tagReader.readElement(nextTag).getContent();
+				Element response = new Element("response");
+				response.setAttribute("xmlns",
+						"urn:ietf:params:xml:ns:xmpp-sasl");
+				response.setContent(CryptoHelper.saslDigestMd5(account,
+						challange, mRandom));
+				tagWriter.writeElement(response);
+			} else if (nextTag.isStart("enabled")) {
+				Element enabled = tagReader.readElement(nextTag);
+				if ("true".equals(enabled.getAttribute("resume"))) {
+					this.streamId = enabled.getAttribute("id");
+					Log.d(Config.LOGTAG, account.getJid()
+							+ ": stream managment(" + smVersion
+							+ ") enabled (resumable)");
+				} else {
+					Log.d(Config.LOGTAG, account.getJid()
+							+ ": stream managment(" + smVersion + ") enabled");
+				}
+				this.lastSessionStarted = SystemClock.elapsedRealtime();
+				this.stanzasReceived = 0;
+				RequestPacket r = new RequestPacket(smVersion);
+				tagWriter.writeStanzaAsync(r);
+			} else if (nextTag.isStart("resumed")) {
+				lastPaketReceived = SystemClock.elapsedRealtime();
+				Element resumed = tagReader.readElement(nextTag);
+				String h = resumed.getAttribute("h");
+				try {
+					int serverCount = Integer.parseInt(h);
+					if (serverCount != stanzasSent) {
+						Log.d(Config.LOGTAG, account.getJid()
+								+ ": session resumed with lost packages");
+						stanzasSent = serverCount;
+					} else {
+						Log.d(Config.LOGTAG, account.getJid()
+								+ ": 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 (NumberFormatException e) {
+
+				}
+				sendInitialPing();
+
+			} else if (nextTag.isStart("r")) {
+				tagReader.readElement(nextTag);
+				AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
+				tagWriter.writeStanzaAsync(ack);
+			} else if (nextTag.isStart("a")) {
+				Element ack = tagReader.readElement(nextTag);
+				lastPaketReceived = SystemClock.elapsedRealtime();
+				int serverSequence = Integer.parseInt(ack.getAttribute("h"));
+				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() + ": resumption failed");
+				streamId = null;
+				if (account.getStatus() != Account.STATUS_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.STATUS_ONLINE) {
+			account.setStatus(Account.STATUS_OFFLINE);
+			if (statusListener != null) {
+				statusListener.onStatusChanged(account);
+			}
+		}
+	}
+
+	private void sendInitialPing() {
+		Log.d(Config.LOGTAG, account.getJid() + ": sending intial ping");
+		IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
+		iq.setFrom(account.getFullJid());
+		iq.addChild("ping", "urn:xmpp:ping");
+		this.sendIqPacket(iq, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(Account account, IqPacket packet) {
+				Log.d(Config.LOGTAG, account.getJid()
+						+ ": online with resource " + account.getResource());
+				changeStatus(Account.STATUS_ONLINE);
+			}
+		});
+	}
+
+	private Element processPacket(Tag currentTag, 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()) {
+				Element child = tagReader.readElement(nextTag);
+				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;
+		lastPaketReceived = SystemClock.elapsedRealtime();
+		return element;
+	}
+
+	private void processIq(Tag currentTag) throws XmlPullParserException,
+			IOException {
+		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())) {
+				if (packetCallbacks.get(packet.getId()) instanceof OnIqPacketReceived) {
+					((OnIqPacketReceived) packetCallbacks.get(packet.getId()))
+							.onIqPacketReceived(account, packet);
+				}
+
+				packetCallbacks.remove(packet.getId());
+			} else if ((packet.getType() == IqPacket.TYPE_GET || packet
+					.getType() == IqPacket.TYPE_SET)
+					&& this.unregisteredIqListener != null) {
+				this.unregisteredIqListener.onIqPacketReceived(account, packet);
+			}
+		}
+	}
+
+	private void processMessage(Tag currentTag) throws XmlPullParserException,
+			IOException {
+		MessagePacket packet = (MessagePacket) processPacket(currentTag,
+				PACKET_MESSAGE);
+		String id = packet.getAttribute("id");
+		if ((id != null) && (packetCallbacks.containsKey(id))) {
+			if (packetCallbacks.get(id) instanceof OnMessagePacketReceived) {
+				((OnMessagePacketReceived) packetCallbacks.get(id))
+						.onMessagePacketReceived(account, packet);
+			}
+			packetCallbacks.remove(id);
+		} else if (this.messageListener != null) {
+			this.messageListener.onMessagePacketReceived(account, packet);
+		}
+	}
+
+	private void processPresence(Tag currentTag) throws XmlPullParserException,
+			IOException {
+		PresencePacket packet = (PresencePacket) processPacket(currentTag,
+				PACKET_PRESENCE);
+		String id = packet.getAttribute("id");
+		if ((id != null) && (packetCallbacks.containsKey(id))) {
+			if (packetCallbacks.get(id) instanceof OnPresencePacketReceived) {
+				((OnPresencePacketReceived) packetCallbacks.get(id))
+						.onPresencePacketReceived(account, packet);
+			}
+			packetCallbacks.remove(id);
+		} else if (this.presenceListener != null) {
+			this.presenceListener.onPresencePacketReceived(account, packet);
+		}
+	}
+
+	private void sendCompressionZlib() throws IOException {
+		Element compress = new Element("compress");
+		compress.setAttribute("xmlns", "http://jabber.org/protocol/compress");
+		compress.addChild("method").setContent("zlib");
+		tagWriter.writeElement(compress);
+	}
+
+	private void switchOverToZLib(Tag currentTag)
+			throws XmlPullParserException, IOException,
+			NoSuchAlgorithmException {
+		tagReader.readTag(); // read tag close
+		tagWriter.setOutputStream(new ZLibOutputStream(tagWriter
+				.getOutputStream()));
+		tagReader
+				.setInputStream(new ZLibInputStream(tagReader.getInputStream()));
+
+		sendStartStream();
+		Log.d(Config.LOGTAG, account.getJid() + ": compression enabled");
+		usingCompression = true;
+		processStream(tagReader.readTag());
+	}
+
+	private void sendStartTLS() throws IOException {
+		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(Tag currentTag) throws XmlPullParserException,
+			IOException {
+		tagReader.readTag();
+		try {
+			SSLContext sc = SSLContext.getInstance("TLS");
+			sc.init(null,
+					new X509TrustManager[] { this.mMemorizingTrustManager },
+					mRandom);
+			SSLSocketFactory factory = sc.getSocketFactory();
+
+			HostnameVerifier verifier = this.mMemorizingTrustManager
+					.wrapHostnameVerifier(new StrictHostnameVerifier());
+			SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,
+					socket.getInetAddress().getHostAddress(), socket.getPort(),
+					true);
+
+			// Support all protocols except legacy SSL.
+			// The min SDK version prevents us having to worry about SSLv2. In
+			// future, this may be
+			// true of SSLv3 as well.
+			final String[] supportProtocols;
+			if (enableLegacySSL()) {
+				supportProtocols = sslSocket.getSupportedProtocols();
+			} else {
+				final List<String> supportedProtocols = new LinkedList<String>(
+						Arrays.asList(sslSocket.getSupportedProtocols()));
+				supportedProtocols.remove("SSLv3");
+				supportProtocols = new String[supportedProtocols.size()];
+				supportedProtocols.toArray(supportProtocols);
+			}
+			sslSocket.setEnabledProtocols(supportProtocols);
+
+			if (verifier != null
+					&& !verifier.verify(account.getServer(),
+							sslSocket.getSession())) {
+				Log.d(Config.LOGTAG, account.getJid()
+						+ ": host mismatch in TLS connection");
+				sslSocket.close();
+				throw new IOException();
+			}
+			tagReader.setInputStream(sslSocket.getInputStream());
+			tagWriter.setOutputStream(sslSocket.getOutputStream());
+			sendStartStream();
+			Log.d(Config.LOGTAG, account.getJid()
+					+ ": TLS connection established");
+			usingEncryption = true;
+			processStream(tagReader.readTag());
+			sslSocket.close();
+		} catch (NoSuchAlgorithmException e1) {
+			e1.printStackTrace();
+		} catch (KeyManagementException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private void sendSaslAuthPlain() throws IOException {
+		String saslString = CryptoHelper.saslPlain(account.getUsername(),
+				account.getPassword());
+		Element auth = new Element("auth");
+		auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
+		auth.setAttribute("mechanism", "PLAIN");
+		auth.setContent(saslString);
+		tagWriter.writeElement(auth);
+	}
+
+	private void sendSaslAuthDigestMd5() throws IOException {
+		Element auth = new Element("auth");
+		auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
+		auth.setAttribute("mechanism", "DIGEST-MD5");
+		tagWriter.writeElement(auth);
+	}
+
+	private void processStreamFeatures(Tag currentTag)
+			throws XmlPullParserException, IOException {
+		this.streamFeatures = tagReader.readElement(currentTag);
+		if (this.streamFeatures.hasChild("starttls") && !usingEncryption) {
+			sendStartTLS();
+		} else if (compressionAvailable()) {
+			sendCompressionZlib();
+		} else if (this.streamFeatures.hasChild("register")
+				&& account.isOptionSet(Account.OPTION_REGISTER)
+				&& usingEncryption) {
+			sendRegistryRequest();
+		} else if (!this.streamFeatures.hasChild("register")
+				&& account.isOptionSet(Account.OPTION_REGISTER)) {
+			changeStatus(Account.STATUS_REGISTRATION_NOT_SUPPORTED);
+			disconnect(true);
+		} else if (this.streamFeatures.hasChild("mechanisms")
+				&& shouldAuthenticate && usingEncryption) {
+			List<String> mechanisms = extractMechanisms(streamFeatures
+					.findChild("mechanisms"));
+			if (mechanisms.contains("PLAIN")) {
+				sendSaslAuthPlain();
+			} else if (mechanisms.contains("DIGEST-MD5")) {
+				sendSaslAuthDigestMd5();
+			}
+		} else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
+				+ smVersion)
+				&& streamId != null) {
+			ResumePacket resume = new ResumePacket(this.streamId,
+					stanzasReceived, smVersion);
+			this.tagWriter.writeStanzaAsync(resume);
+		} else if (this.streamFeatures.hasChild("bind") && shouldBind) {
+			sendBindRequest();
+		} else {
+			Log.d(Config.LOGTAG, account.getJid()
+					+ ": incompatible server. disconnecting");
+			disconnect(true);
+		}
+	}
+
+	private boolean compressionAvailable() {
+		if (!this.streamFeatures.hasChild("compression",
+				"http://jabber.org/features/compress"))
+			return false;
+		if (!ZLibOutputStream.SUPPORTED)
+			return false;
+		if (!account.isOptionSet(Account.OPTION_USECOMPRESSION))
+			return false;
+
+		Element compression = this.streamFeatures.findChild("compression",
+				"http://jabber.org/features/compress");
+		for (Element child : compression.getChildren()) {
+			if (!"method".equals(child.getName()))
+				continue;
+
+			if ("zlib".equalsIgnoreCase(child.getContent())) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	private List<String> extractMechanisms(Element stream) {
+		ArrayList<String> mechanisms = new ArrayList<String>(stream
+				.getChildren().size());
+		for (Element child : stream.getChildren()) {
+			mechanisms.add(child.getContent());
+		}
+		return mechanisms;
+	}
+
+	private void sendRegistryRequest() {
+		IqPacket register = new IqPacket(IqPacket.TYPE_GET);
+		register.query("jabber:iq:register");
+		register.setTo(account.getServer());
+		sendIqPacket(register, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(Account account, IqPacket packet) {
+				Element instructions = packet.query().findChild("instructions");
+				if (packet.query().hasChild("username")
+						&& (packet.query().hasChild("password"))) {
+					IqPacket register = new IqPacket(IqPacket.TYPE_SET);
+					Element username = new Element("username")
+							.setContent(account.getUsername());
+					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(Account account,
+								IqPacket packet) {
+							if (packet.getType() == IqPacket.TYPE_RESULT) {
+								account.setOption(Account.OPTION_REGISTER,
+										false);
+								changeStatus(Account.STATUS_REGISTRATION_SUCCESSFULL);
+							} else if (packet.hasChild("error")
+									&& (packet.findChild("error")
+											.hasChild("conflict"))) {
+								changeStatus(Account.STATUS_REGISTRATION_CONFLICT);
+							} else {
+								changeStatus(Account.STATUS_REGISTRATION_FAILED);
+								Log.d(Config.LOGTAG, packet.toString());
+							}
+							disconnect(true);
+						}
+					});
+				} else {
+					changeStatus(Account.STATUS_REGISTRATION_FAILED);
+					disconnect(true);
+					Log.d(Config.LOGTAG, account.getJid()
+							+ ": could not register. instructions are"
+							+ instructions.getContent());
+				}
+			}
+		});
+	}
+
+	private void sendBindRequest() throws IOException {
+		IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
+		iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
+				.addChild("resource").setContent(account.getResource());
+		this.sendUnboundIqPacket(iq, new OnIqPacketReceived() {
+			@Override
+			public void onIqPacketReceived(Account account, IqPacket packet) {
+				Element bind = packet.findChild("bind");
+				if (bind != null) {
+					Element jid = bind.findChild("jid");
+					if (jid != null && jid.getContent() != null) {
+						account.setResource(jid.getContent().split("/", 2)[1]);
+						if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
+							smVersion = 3;
+							EnablePacket enable = new EnablePacket(smVersion);
+							tagWriter.writeStanzaAsync(enable);
+							stanzasSent = 0;
+							messageReceipts.clear();
+						} else if (streamFeatures.hasChild("sm",
+								"urn:xmpp:sm:2")) {
+							smVersion = 2;
+							EnablePacket enable = new EnablePacket(smVersion);
+							tagWriter.writeStanzaAsync(enable);
+							stanzasSent = 0;
+							messageReceipts.clear();
+						}
+						sendServiceDiscoveryInfo(account.getServer());
+						sendServiceDiscoveryItems(account.getServer());
+						if (bindListener != null) {
+							bindListener.onBind(account);
+						}
+						sendInitialPing();
+					} else {
+						disconnect(true);
+					}
+				} else {
+					disconnect(true);
+				}
+			}
+		});
+		if (this.streamFeatures.hasChild("session")) {
+			Log.d(Config.LOGTAG, account.getJid()
+					+ ": sending deprecated session");
+			IqPacket startSession = new IqPacket(IqPacket.TYPE_SET);
+			startSession.addChild("session",
+					"urn:ietf:params:xml:ns:xmpp-session");
+			this.sendUnboundIqPacket(startSession, null);
+		}
+	}
+
+	private void sendServiceDiscoveryInfo(final String server) {
+		IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
+		iq.setTo(server);
+		iq.query("http://jabber.org/protocol/disco#info");
+		this.sendIqPacket(iq, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(Account account, IqPacket packet) {
+				List<Element> elements = packet.query().getChildren();
+				List<String> features = new ArrayList<String>();
+				for (int i = 0; i < elements.size(); ++i) {
+					if (elements.get(i).getName().equals("feature")) {
+						features.add(elements.get(i).getAttribute("var"));
+					}
+				}
+				disco.put(server, features);
+
+				if (account.getServer().equals(server)) {
+					enableAdvancedStreamFeatures();
+				}
+			}
+		});
+	}
+
+	private void enableAdvancedStreamFeatures() {
+		if (getFeatures().carbons()) {
+			sendEnableCarbons();
+		}
+	}
+
+	private void sendServiceDiscoveryItems(final String server) {
+		IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
+		iq.setTo(server);
+		iq.query("http://jabber.org/protocol/disco#items");
+		this.sendIqPacket(iq, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(Account account, IqPacket packet) {
+				List<Element> elements = packet.query().getChildren();
+				for (int i = 0; i < elements.size(); ++i) {
+					if (elements.get(i).getName().equals("item")) {
+						String jid = elements.get(i).getAttribute("jid");
+						sendServiceDiscoveryInfo(jid);
+					}
+				}
+			}
+		});
+	}
+
+	private void sendEnableCarbons() {
+		IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
+		iq.addChild("enable", "urn:xmpp:carbons:2");
+		this.sendIqPacket(iq, new OnIqPacketReceived() {
+
+			@Override
+			public void onIqPacketReceived(Account account, IqPacket packet) {
+				if (!packet.hasChild("error")) {
+					Log.d(Config.LOGTAG, account.getJid()
+							+ ": successfully enabled carbons");
+				} else {
+					Log.d(Config.LOGTAG, account.getJid()
+							+ ": error enableing carbons " + packet.toString());
+				}
+			}
+		});
+	}
+
+	private void processStreamError(Tag currentTag)
+			throws XmlPullParserException, IOException {
+		Element streamError = tagReader.readElement(currentTag);
+		if (streamError != null && streamError.hasChild("conflict")) {
+			String resource = account.getResource().split("\\.")[0];
+			account.setResource(resource + "." + nextRandomId());
+			Log.d(Config.LOGTAG,
+					account.getJid() + ": switching resource due to conflict ("
+							+ account.getResource() + ")");
+		}
+	}
+
+	private void sendStartStream() throws IOException {
+		Tag stream = Tag.start("stream:stream");
+		stream.setAttribute("from", account.getJid());
+		stream.setAttribute("to", account.getServer());
+		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, mRandom).toString(32);
+	}
+
+	public void sendIqPacket(IqPacket packet, OnIqPacketReceived callback) {
+		if (packet.getId() == null) {
+			String id = nextRandomId();
+			packet.setAttribute("id", id);
+		}
+		packet.setFrom(account.getFullJid());
+		this.sendPacket(packet, callback);
+	}
+
+	public void sendUnboundIqPacket(IqPacket packet, OnIqPacketReceived callback) {
+		if (packet.getId() == null) {
+			String id = nextRandomId();
+			packet.setAttribute("id", id);
+		}
+		this.sendPacket(packet, callback);
+	}
+
+	public void sendMessagePacket(MessagePacket packet) {
+		this.sendPacket(packet, null);
+	}
+
+	public void sendPresencePacket(PresencePacket packet) {
+		this.sendPacket(packet, null);
+	}
+
+	private synchronized void sendPacket(final AbstractStanza packet,
+			PacketReceived callback) {
+		if (packet.getName().equals("iq") || packet.getName().equals("message")
+				|| packet.getName().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));
+		}
+		if (callback != null) {
+			if (packet.getId() == null) {
+				packet.setId(nextRandomId());
+			}
+			packetCallbacks.put(packet.getId(), callback);
+		}
+	}
+
+	public void sendPing() {
+		if (streamFeatures.hasChild("sm")) {
+			tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
+		} else {
+			IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
+			iq.setFrom(account.getFullJid());
+			iq.addChild("ping", "urn:xmpp:ping");
+			this.sendIqPacket(iq, null);
+		}
+		this.lastPingSent = SystemClock.elapsedRealtime();
+	}
+
+	public void setOnMessagePacketReceivedListener(
+			OnMessagePacketReceived listener) {
+		this.messageListener = listener;
+	}
+
+	public void setOnUnregisteredIqPacketReceivedListener(
+			OnIqPacketReceived listener) {
+		this.unregisteredIqListener = listener;
+	}
+
+	public void setOnPresencePacketReceivedListener(
+			OnPresencePacketReceived listener) {
+		this.presenceListener = listener;
+	}
+
+	public void setOnJinglePacketReceivedListener(
+			OnJinglePacketReceived listener) {
+		this.jingleListener = listener;
+	}
+
+	public void setOnStatusChangedListener(OnStatusChanged listener) {
+		this.statusListener = listener;
+	}
+
+	public void setOnBindListener(OnBindListener listener) {
+		this.bindListener = listener;
+	}
+
+	public void setOnMessageAcknowledgeListener(OnMessageAcknowledged listener) {
+		this.acknowledgedListener = listener;
+	}
+
+	public void disconnect(boolean force) {
+		Log.d(Config.LOGTAG, account.getJid() + ": 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 (IOException e) {
+							Log.d(Config.LOGTAG,
+									"io exception during disconnect");
+						} catch (InterruptedException e) {
+							Log.d(Config.LOGTAG, "interrupted");
+						}
+					}
+				}
+			}).start();
+		} catch (IOException e) {
+			Log.d(Config.LOGTAG, "io exception during disconnect");
+		}
+	}
+
+	public List<String> findDiscoItemsByFeature(String feature) {
+		List<String> items = new ArrayList<String>();
+		for (Entry<String, List<String>> cursor : disco.entrySet()) {
+			if (cursor.getValue().contains(feature)) {
+				items.add(cursor.getKey());
+			}
+		}
+		return items;
+	}
+
+	public String findDiscoItemByFeature(String feature) {
+		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() {
+		return findDiscoItemByFeature("http://jabber.org/protocol/muc");
+	}
+
+	public int getTimeToNextAttempt() {
+		int interval = (int) (25 * Math.pow(1.5, attempt));
+		int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
+		return interval - secondsSinceLast;
+	}
+
+	public int getAttempt() {
+		return this.attempt;
+	}
+
+	public Features getFeatures() {
+		return this.features;
+	}
+
+	public class Features {
+		XmppConnection connection;
+
+		public Features(XmppConnection connection) {
+			this.connection = connection;
+		}
+
+		private boolean hasDiscoFeature(String server, String feature) {
+			if (!connection.disco.containsKey(server)) {
+				return false;
+			}
+			return connection.disco.get(server).contains(feature);
+		}
+
+		public boolean carbons() {
+			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
+		}
+
+		public boolean sm() {
+			return streamId != null;
+		}
+
+		public boolean csi() {
+			if (connection.streamFeatures == null) {
+				return false;
+			} else {
+				return connection.streamFeatures.hasChild("csi",
+						"urn:xmpp:csi:0");
+			}
+		}
+
+		public boolean pubsub() {
+			return hasDiscoFeature(account.getServer(),
+					"http://jabber.org/protocol/pubsub#publish");
+		}
+
+		public boolean rosterVersioning() {
+			if (connection.streamFeatures == null) {
+				return false;
+			} else {
+				return connection.streamFeatures.hasChild("ver");
+			}
+		}
+
+		public boolean streamhost() {
+			return connection
+					.findDiscoItemByFeature("http://jabber.org/protocol/bytestreams") != null;
+		}
+
+		public boolean compression() {
+			return connection.usingCompression;
+		}
+	}
+
+	public long getLastSessionEstablished() {
+		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.lastPaketReceived;
+	}
+
+	public void sendActive() {
+		this.sendPacket(new ActivePacket(), null);
+	}
+
+	public void sendInactive() {
+		this.sendPacket(new InactivePacket(), null);
+	}
+}