693 lines
22 KiB
Java
693 lines
22 KiB
Java
package eu.siacs.conversations.xmpp;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.math.BigInteger;
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import java.net.Socket;
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import java.net.UnknownHostException;
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import java.security.KeyManagementException;
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import java.security.KeyStore;
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import java.security.KeyStoreException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.security.cert.CertPathValidatorException;
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import java.security.cert.CertificateException;
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import java.security.cert.X509Certificate;
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import java.util.HashSet;
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import java.util.Hashtable;
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import java.util.List;
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import javax.net.ssl.SSLContext;
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import javax.net.ssl.SSLSocket;
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import javax.net.ssl.SSLSocketFactory;
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import javax.net.ssl.TrustManager;
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import javax.net.ssl.TrustManagerFactory;
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import javax.net.ssl.X509TrustManager;
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import org.json.JSONException;
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import org.xmlpull.v1.XmlPullParserException;
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import android.os.Bundle;
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import android.os.PowerManager;
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import android.os.SystemClock;
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import android.util.Log;
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import eu.siacs.conversations.entities.Account;
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import eu.siacs.conversations.utils.CryptoHelper;
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import eu.siacs.conversations.utils.DNSHelper;
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import eu.siacs.conversations.xml.Element;
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import eu.siacs.conversations.xml.Tag;
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import eu.siacs.conversations.xml.TagWriter;
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import eu.siacs.conversations.xml.XmlReader;
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import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
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import eu.siacs.conversations.xmpp.stanzas.IqPacket;
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import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
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import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
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import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
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import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
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import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
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import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
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public class XmppConnection implements Runnable {
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protected Account account;
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private static final String LOGTAG = "xmppService";
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private PowerManager.WakeLock wakeLock;
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private SecureRandom random = new SecureRandom();
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private Socket socket;
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private XmlReader tagReader;
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private TagWriter tagWriter;
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private boolean shouldBind = true;
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private boolean shouldAuthenticate = true;
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private Element streamFeatures;
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private HashSet<String> discoFeatures = new HashSet<String>();
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private String streamId = null;
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private int stanzasReceived = 0;
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private int stanzasSent = 0;
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public long lastPaketReceived = 0;
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public long lastPingSent = 0;
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public long lastConnect = 0;
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public long lastSessionStarted = 0;
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private static final int PACKET_IQ = 0;
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private static final int PACKET_MESSAGE = 1;
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private static final int PACKET_PRESENCE = 2;
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private Hashtable<String, PacketReceived> packetCallbacks = new Hashtable<String, PacketReceived>();
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private OnPresencePacketReceived presenceListener = null;
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private OnIqPacketReceived unregisteredIqListener = null;
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private OnMessagePacketReceived messageListener = null;
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private OnStatusChanged statusListener = null;
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private OnTLSExceptionReceived tlsListener;
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public XmppConnection(Account account, PowerManager pm) {
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this.account = account;
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wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
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"XmppConnection");
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tagReader = new XmlReader(wakeLock);
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tagWriter = new TagWriter();
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}
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protected void changeStatus(int nextStatus) {
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if (account.getStatus() != nextStatus) {
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account.setStatus(nextStatus);
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if (statusListener != null) {
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statusListener.onStatusChanged(account);
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}
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}
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}
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protected void connect() {
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Log.d(LOGTAG,account.getJid()+ ": connecting");
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lastConnect = SystemClock.elapsedRealtime();
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try {
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shouldAuthenticate = shouldBind = !account.isOptionSet(Account.OPTION_REGISTER);
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tagReader = new XmlReader(wakeLock);
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tagWriter = new TagWriter();
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packetCallbacks.clear();
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this.changeStatus(Account.STATUS_CONNECTING);
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Bundle namePort = DNSHelper.getSRVRecord(account.getServer());
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String srvRecordServer = namePort.getString("name");
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int srvRecordPort = namePort.getInt("port");
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if (srvRecordServer != null) {
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Log.d(LOGTAG, account.getJid() + ": using values from dns "
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+ srvRecordServer + ":" + srvRecordPort);
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socket = new Socket(srvRecordServer, srvRecordPort);
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} else {
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socket = new Socket(account.getServer(), 5222);
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}
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OutputStream out = socket.getOutputStream();
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tagWriter.setOutputStream(out);
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InputStream in = socket.getInputStream();
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tagReader.setInputStream(in);
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tagWriter.beginDocument();
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sendStartStream();
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Tag nextTag;
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while ((nextTag = tagReader.readTag()) != null) {
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if (nextTag.isStart("stream")) {
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processStream(nextTag);
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break;
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} else {
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Log.d(LOGTAG, "found unexpected tag: " + nextTag.getName());
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return;
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}
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}
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if (socket.isConnected()) {
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socket.close();
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}
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} catch (UnknownHostException e) {
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this.changeStatus(Account.STATUS_SERVER_NOT_FOUND);
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if (wakeLock.isHeld()) {
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wakeLock.release();
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}
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return;
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} catch (IOException e) {
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if (account.getStatus() != Account.STATUS_TLS_ERROR) {
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this.changeStatus(Account.STATUS_OFFLINE);
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}
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if (wakeLock.isHeld()) {
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wakeLock.release();
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}
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return;
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} catch (XmlPullParserException e) {
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this.changeStatus(Account.STATUS_OFFLINE);
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Log.d(LOGTAG, "xml exception " + e.getMessage());
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if (wakeLock.isHeld()) {
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wakeLock.release();
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}
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return;
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}
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}
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@Override
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public void run() {
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connect();
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}
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private void processStream(Tag currentTag) throws XmlPullParserException,
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IOException {
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Tag nextTag = tagReader.readTag();
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while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
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if (nextTag.isStart("error")) {
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processStreamError(nextTag);
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} else if (nextTag.isStart("features")) {
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processStreamFeatures(nextTag);
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if ((streamFeatures.getChildren().size() == 1)
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&& (streamFeatures.hasChild("starttls"))
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&& (!account.isOptionSet(Account.OPTION_USETLS))) {
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changeStatus(Account.STATUS_SERVER_REQUIRES_TLS);
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}
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if (account.isOptionSet(Account.OPTION_REGISTER)) {
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Log.d(LOGTAG,account.getJid()+": trying to register");
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}
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} else if (nextTag.isStart("proceed")) {
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switchOverToTls(nextTag);
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} else if (nextTag.isStart("success")) {
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Log.d(LOGTAG, account.getJid()
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+ ": logged in");
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tagReader.readTag();
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tagReader.reset();
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sendStartStream();
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processStream(tagReader.readTag());
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break;
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} else if (nextTag.isStart("failure")) {
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tagReader.readElement(nextTag);
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changeStatus(Account.STATUS_UNAUTHORIZED);
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} else if (nextTag.isStart("enabled")) {
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this.stanzasSent = 0;
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Element enabled = tagReader.readElement(nextTag);
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if ("true".equals(enabled.getAttribute("resume"))) {
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this.streamId = enabled.getAttribute("id");
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Log.d(LOGTAG,account.getJid()+": stream managment enabled (resumable)");
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} else {
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Log.d(LOGTAG,account.getJid()+": stream managment enabled");
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}
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this.lastSessionStarted = SystemClock.elapsedRealtime();
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this.stanzasReceived = 0;
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RequestPacket r = new RequestPacket();
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tagWriter.writeStanzaAsync(r);
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} else if (nextTag.isStart("resumed")) {
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tagReader.readElement(nextTag);
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changeStatus(Account.STATUS_ONLINE);
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Log.d(LOGTAG,account.getJid()+": session resumed");
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} else if (nextTag.isStart("r")) {
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tagReader.readElement(nextTag);
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AckPacket ack = new AckPacket(this.stanzasReceived);
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//Log.d(LOGTAG,ack.toString());
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tagWriter.writeStanzaAsync(ack);
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} else if (nextTag.isStart("a")) {
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Element ack = tagReader.readElement(nextTag);
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lastPaketReceived = SystemClock.elapsedRealtime();
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int serverSequence = Integer.parseInt(ack.getAttribute("h"));
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if (serverSequence>this.stanzasSent) {
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this.stanzasSent = serverSequence;
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}
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//Log.d(LOGTAG,"server ack"+ack.toString()+" ("+this.stanzasSent+")");
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} else if (nextTag.isStart("failed")) {
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tagReader.readElement(nextTag);
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Log.d(LOGTAG,account.getJid()+": resumption failed");
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streamId = null;
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if (account.getStatus() != Account.STATUS_ONLINE) {
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sendBindRequest();
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}
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} else if (nextTag.isStart("iq")) {
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processIq(nextTag);
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} else if (nextTag.isStart("message")) {
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processMessage(nextTag);
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} else if (nextTag.isStart("presence")) {
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processPresence(nextTag);
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} else {
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Log.d(LOGTAG, "found unexpected tag: " + nextTag.getName()
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+ " as child of " + currentTag.getName());
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}
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nextTag = tagReader.readTag();
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}
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if (account.getStatus() == Account.STATUS_ONLINE) {
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account.setStatus(Account.STATUS_OFFLINE);
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if (statusListener != null) {
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statusListener.onStatusChanged(account);
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}
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}
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}
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private Element processPacket(Tag currentTag, int packetType)
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throws XmlPullParserException, IOException {
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Element element;
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switch (packetType) {
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case PACKET_IQ:
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element = new IqPacket();
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break;
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case PACKET_MESSAGE:
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element = new MessagePacket();
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break;
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case PACKET_PRESENCE:
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element = new PresencePacket();
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break;
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default:
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return null;
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}
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element.setAttributes(currentTag.getAttributes());
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Tag nextTag = tagReader.readTag();
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while (!nextTag.isEnd(element.getName())) {
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if (!nextTag.isNo()) {
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Element child = tagReader.readElement(nextTag);
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element.addChild(child);
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}
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nextTag = tagReader.readTag();
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}
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++stanzasReceived;
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lastPaketReceived = SystemClock.elapsedRealtime();
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return element;
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}
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private void processIq(Tag currentTag) throws XmlPullParserException,
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IOException {
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IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
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if (packetCallbacks.containsKey(packet.getId())) {
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if (packetCallbacks.get(packet.getId()) instanceof OnIqPacketReceived) {
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((OnIqPacketReceived) packetCallbacks.get(packet.getId()))
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.onIqPacketReceived(account, packet);
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}
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packetCallbacks.remove(packet.getId());
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} else if (this.unregisteredIqListener != null) {
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this.unregisteredIqListener.onIqPacketReceived(account, packet);
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}
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}
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private void processMessage(Tag currentTag) throws XmlPullParserException,
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IOException {
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MessagePacket packet = (MessagePacket) processPacket(currentTag,
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PACKET_MESSAGE);
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String id = packet.getAttribute("id");
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if ((id != null) && (packetCallbacks.containsKey(id))) {
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if (packetCallbacks.get(id) instanceof OnMessagePacketReceived) {
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((OnMessagePacketReceived) packetCallbacks.get(id))
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.onMessagePacketReceived(account, packet);
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}
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packetCallbacks.remove(id);
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} else if (this.messageListener != null) {
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this.messageListener.onMessagePacketReceived(account, packet);
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}
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}
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private void processPresence(Tag currentTag) throws XmlPullParserException,
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IOException {
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PresencePacket packet = (PresencePacket) processPacket(currentTag,
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PACKET_PRESENCE);
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String id = packet.getAttribute("id");
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if ((id != null) && (packetCallbacks.containsKey(id))) {
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if (packetCallbacks.get(id) instanceof OnPresencePacketReceived) {
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((OnPresencePacketReceived) packetCallbacks.get(id))
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.onPresencePacketReceived(account, packet);
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}
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packetCallbacks.remove(id);
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} else if (this.presenceListener != null) {
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this.presenceListener.onPresencePacketReceived(account, packet);
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}
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}
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private void sendStartTLS() throws IOException {
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Tag startTLS = Tag.empty("starttls");
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startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
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tagWriter.writeTag(startTLS);
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}
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private void switchOverToTls(Tag currentTag) throws XmlPullParserException,
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IOException {
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Tag nextTag = tagReader.readTag(); // should be proceed end tag
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try {
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SSLContext sc = SSLContext.getInstance("TLS");
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TrustManagerFactory tmf = TrustManagerFactory
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.getInstance(TrustManagerFactory.getDefaultAlgorithm());
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// Initialise the TMF as you normally would, for example:
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// tmf.in
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try {
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tmf.init((KeyStore) null);
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} catch (KeyStoreException e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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}
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TrustManager[] trustManagers = tmf.getTrustManagers();
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final X509TrustManager origTrustmanager = (X509TrustManager) trustManagers[0];
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TrustManager[] wrappedTrustManagers = new TrustManager[] { new X509TrustManager() {
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@Override
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public void checkClientTrusted(X509Certificate[] chain,
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String authType) throws CertificateException {
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origTrustmanager.checkClientTrusted(chain, authType);
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}
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@Override
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public void checkServerTrusted(X509Certificate[] chain,
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String authType) throws CertificateException {
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try {
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origTrustmanager.checkServerTrusted(chain, authType);
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} catch (CertificateException e) {
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if (e.getCause() instanceof CertPathValidatorException) {
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String sha;
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try {
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MessageDigest sha1 = MessageDigest.getInstance("SHA1");
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sha1.update(chain[0].getEncoded());
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sha = CryptoHelper.bytesToHex(sha1.digest());
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if (!sha.equals(account.getSSLFingerprint())) {
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changeStatus(Account.STATUS_TLS_ERROR);
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if (tlsListener!=null) {
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tlsListener.onTLSExceptionReceived(sha,account);
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}
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throw new CertificateException();
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}
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} catch (NoSuchAlgorithmException e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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}
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} else {
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throw new CertificateException();
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}
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}
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}
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@Override
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public X509Certificate[] getAcceptedIssuers() {
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return origTrustmanager.getAcceptedIssuers();
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}
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} };
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sc.init(null, wrappedTrustManagers, null);
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SSLSocketFactory factory = sc.getSocketFactory();
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SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,
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socket.getInetAddress().getHostAddress(), socket.getPort(),
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true);
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tagReader.setInputStream(sslSocket.getInputStream());
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tagWriter.setOutputStream(sslSocket.getOutputStream());
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sendStartStream();
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Log.d(LOGTAG,account.getJid()+": TLS connection established");
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processStream(tagReader.readTag());
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sslSocket.close();
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} catch (NoSuchAlgorithmException e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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} catch (KeyManagementException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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private void sendSaslAuth() throws IOException, XmlPullParserException {
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String saslString = CryptoHelper.saslPlain(account.getUsername(),
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account.getPassword());
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Element auth = new Element("auth");
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auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
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auth.setAttribute("mechanism", "PLAIN");
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auth.setContent(saslString);
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tagWriter.writeElement(auth);
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}
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private void processStreamFeatures(Tag currentTag)
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throws XmlPullParserException, IOException {
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this.streamFeatures = tagReader.readElement(currentTag);
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if (this.streamFeatures.hasChild("starttls")
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&& account.isOptionSet(Account.OPTION_USETLS)) {
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sendStartTLS();
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} else if (this.streamFeatures.hasChild("mechanisms")
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&& shouldAuthenticate) {
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sendSaslAuth();
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} else if (this.streamFeatures.hasChild("sm") && streamId != null) {
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Log.d(LOGTAG,"found old stream id. trying to remuse");
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ResumePacket resume = new ResumePacket(this.streamId,stanzasReceived);
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this.tagWriter.writeStanzaAsync(resume);
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} else if (this.streamFeatures.hasChild("bind") && shouldBind) {
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sendBindRequest();
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if (this.streamFeatures.hasChild("session")) {
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Log.d(LOGTAG,"sending session");
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IqPacket startSession = new IqPacket(IqPacket.TYPE_SET);
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Element session = new Element("session");
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session.setAttribute("xmlns",
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"urn:ietf:params:xml:ns:xmpp-session");
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session.setContent("");
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startSession.addChild(session);
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this.sendIqPacket(startSession, null);
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}
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}
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}
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private void sendInitialPresence() {
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PresencePacket packet = new PresencePacket();
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packet.setAttribute("from", account.getFullJid());
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if (account.getKeys().has("pgp_signature")) {
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try {
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String signature = account.getKeys().getString("pgp_signature");
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Element status = new Element("status");
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status.setContent("online");
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packet.addChild(status);
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Element x = new Element("x");
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x.setAttribute("xmlns", "jabber:x:signed");
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x.setContent(signature);
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packet.addChild(x);
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} catch (JSONException e) {
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//
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}
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}
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this.sendPresencePacket(packet);
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}
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private void sendBindRequest() throws IOException {
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IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
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Element bind = new Element("bind");
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bind.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-bind");
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Element resource = new Element("resource");
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resource.setContent("Conversations");
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bind.addChild(resource);
|
|
iq.addChild(bind);
|
|
this.sendIqPacket(iq, new OnIqPacketReceived() {
|
|
@Override
|
|
public void onIqPacketReceived(Account account, IqPacket packet) {
|
|
String resource = packet.findChild("bind").findChild("jid")
|
|
.getContent().split("/")[1];
|
|
account.setResource(resource);
|
|
account.setStatus(Account.STATUS_ONLINE);
|
|
if (streamFeatures.hasChild("sm")) {
|
|
EnablePacket enable = new EnablePacket();
|
|
tagWriter.writeStanzaAsync(enable);
|
|
}
|
|
sendInitialPresence();
|
|
sendServiceDiscovery();
|
|
if (statusListener != null) {
|
|
statusListener.onStatusChanged(account);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
private void sendServiceDiscovery() {
|
|
IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
|
|
iq.setAttribute("to", account.getServer());
|
|
Element query = new Element("query");
|
|
query.setAttribute("xmlns", "http://jabber.org/protocol/disco#info");
|
|
iq.addChild(query);
|
|
this.sendIqPacket(iq, new OnIqPacketReceived() {
|
|
|
|
@Override
|
|
public void onIqPacketReceived(Account account, IqPacket packet) {
|
|
if (packet.hasChild("query")) {
|
|
List<Element> elements = packet.findChild("query")
|
|
.getChildren();
|
|
for (int i = 0; i < elements.size(); ++i) {
|
|
if (elements.get(i).getName().equals("feature")) {
|
|
discoFeatures.add(elements.get(i).getAttribute(
|
|
"var"));
|
|
}
|
|
}
|
|
}
|
|
if (discoFeatures.contains("urn:xmpp:carbons:2")) {
|
|
sendEnableCarbons();
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
private void sendEnableCarbons() {
|
|
IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
|
|
Element enable = new Element("enable");
|
|
enable.setAttribute("xmlns", "urn:xmpp:carbons:2");
|
|
iq.addChild(enable);
|
|
this.sendIqPacket(iq, new OnIqPacketReceived() {
|
|
|
|
@Override
|
|
public void onIqPacketReceived(Account account, IqPacket packet) {
|
|
if (!packet.hasChild("error")) {
|
|
Log.d(LOGTAG, account.getJid()
|
|
+ ": successfully enabled carbons");
|
|
} else {
|
|
Log.d(LOGTAG, account.getJid()
|
|
+ ": error enableing carbons " + packet.toString());
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
private void processStreamError(Tag currentTag) {
|
|
Log.d(LOGTAG, "processStreamError");
|
|
}
|
|
|
|
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, random).toString(32);
|
|
}
|
|
|
|
public void sendIqPacket(IqPacket packet, OnIqPacketReceived callback) {
|
|
String id = nextRandomId();
|
|
packet.setAttribute("id", id);
|
|
this.sendPacket(packet, callback);
|
|
}
|
|
|
|
public void sendMessagePacket(MessagePacket packet) {
|
|
this.sendPacket(packet, null);
|
|
}
|
|
|
|
public void sendMessagePacket(MessagePacket packet,
|
|
OnMessagePacketReceived callback) {
|
|
this.sendPacket(packet, callback);
|
|
}
|
|
|
|
public void sendPresencePacket(PresencePacket packet) {
|
|
this.sendPacket(packet, null);
|
|
}
|
|
|
|
public void sendPresencePacket(PresencePacket packet,
|
|
OnPresencePacketReceived callback) {
|
|
this.sendPacket(packet, callback);
|
|
}
|
|
|
|
private synchronized void sendPacket(final AbstractStanza packet, PacketReceived callback) {
|
|
// TODO dont increment stanza count if packet = request packet or ack;
|
|
++stanzasSent;
|
|
tagWriter.writeStanzaAsync(packet);
|
|
if (callback != null) {
|
|
if (packet.getId()==null) {
|
|
packet.setId(nextRandomId());
|
|
}
|
|
packetCallbacks.put(packet.getId(), callback);
|
|
}
|
|
}
|
|
|
|
public void sendPing() {
|
|
if (streamFeatures.hasChild("sm")) {
|
|
Log.d(LOGTAG,account.getJid()+": sending r as ping");
|
|
tagWriter.writeStanzaAsync(new RequestPacket());
|
|
} else {
|
|
Log.d(LOGTAG,account.getJid()+": sending iq as ping");
|
|
IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
|
|
Element ping = new Element("ping");
|
|
iq.setAttribute("from",account.getFullJid());
|
|
ping.setAttribute("xmlns", "urn:xmpp:ping");
|
|
iq.addChild(ping);
|
|
this.sendIqPacket(iq, null);
|
|
}
|
|
}
|
|
|
|
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 setOnStatusChangedListener(OnStatusChanged listener) {
|
|
this.statusListener = listener;
|
|
}
|
|
|
|
public void setOnTLSExceptionReceivedListener(OnTLSExceptionReceived listener) {
|
|
this.tlsListener = listener;
|
|
}
|
|
|
|
public void disconnect(boolean force) {
|
|
Log.d(LOGTAG,"disconnecting");
|
|
try {
|
|
if (force) {
|
|
socket.close();
|
|
return;
|
|
}
|
|
tagWriter.finish();
|
|
while(!tagWriter.finished()) {
|
|
//Log.d(LOGTAG,"not yet finished");
|
|
Thread.sleep(100);
|
|
}
|
|
tagWriter.writeTag(Tag.end("stream:stream"));
|
|
} catch (IOException e) {
|
|
Log.d(LOGTAG,"io exception during disconnect");
|
|
} catch (InterruptedException e) {
|
|
Log.d(LOGTAG,"interupted while waiting for disconnect");
|
|
}
|
|
}
|
|
|
|
public boolean hasFeatureRosterManagment() {
|
|
if (this.streamFeatures==null) {
|
|
return false;
|
|
} else {
|
|
return this.streamFeatures.hasChild("ver");
|
|
}
|
|
}
|
|
|
|
public void r() {
|
|
this.tagWriter.writeStanzaAsync(new RequestPacket());
|
|
}
|
|
|
|
public int getReceivedStanzas() {
|
|
return this.stanzasReceived;
|
|
}
|
|
|
|
public int getSentStanzas() {
|
|
return this.stanzasSent;
|
|
}
|
|
}
|