squashed commit for Pluggable Transports

* implement handling of different provider API version (v1 and v2)
* detect provider's obfs support
* shapeshifter-dispatcher installation
* necessary changes to control shapeshifter-dispatcher from Bitmask
* route openvpn traffic over shapeshifter-dispatcher

17 files changed, 1186 insertions, 123 deletions

diff --git a/app/src/main/java/de/blinkt/openvpn/VpnProfile.java b/app/src/main/java/de/blinkt/openvpn/VpnProfile.java
index 7b9003aa..9f18b8ed 100644
--- a/app/src/main/java/de/blinkt/openvpn/VpnProfile.java
+++ b/app/src/main/java/de/blinkt/openvpn/VpnProfile.java
@@ -5,6 +5,11 @@
 
 package de.blinkt.openvpn;
 
+import de.blinkt.openvpn.core.connection.Connection;
+import de.blinkt.openvpn.core.connection.OpenvpnConnection;
+import se.leap.bitmaskclient.R;
+import se.leap.bitmaskclient.BuildConfig;
+
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.Intent;
@@ -189,7 +194,7 @@ public class VpnProfile implements Serializable, Cloneable {
         mProfileVersion = CURRENT_PROFILE_VERSION;
 
         mConnections = new Connection[1];
-        mConnections[0] = new Connection();
+        mConnections[0] = new OpenvpnConnection();
         mLastUsed = System.currentTimeMillis();
     }
 
@@ -314,8 +319,8 @@ public class VpnProfile implements Serializable, Cloneable {
         }
         if (mProfileVersion < 7) {
             for (Connection c : mConnections)
-                if (c.mProxyType == null)
-                    c.mProxyType = Connection.ProxyType.NONE;
+                if (c.getProxyType() == null)
+                    c.setProxyType(Connection.ProxyType.NONE);
         }
 
         mProfileVersion = CURRENT_PROFILE_VERSION;
@@ -324,12 +329,12 @@ public class VpnProfile implements Serializable, Cloneable {
 
     private void moveOptionsToConnection() {
         mConnections = new Connection[1];
-        Connection conn = new Connection();
+        Connection conn = new OpenvpnConnection();
 
-        conn.mServerName = mServerName;
-        conn.mServerPort = mServerPort;
-        conn.mUseUdp = mUseUdp;
-        conn.mCustomConfiguration = "";
+        conn.setServerName(mServerName);
+        conn.setServerPort(mServerPort);
+        conn.setUseUdp(mUseUdp);
+        conn.setCustomConfiguration("");
 
         mConnections[0] = conn;
 
@@ -425,7 +430,7 @@ public class VpnProfile implements Serializable, Cloneable {
 
             if (canUsePlainRemotes) {
                 for (Connection conn : mConnections) {
-                    if (conn.mEnabled) {
+                    if (conn.isEnabled()) {
                         cfg.append(conn.getConnectionBlock(configForOvpn3));
                     }
                 }
@@ -586,7 +591,7 @@ public class VpnProfile implements Serializable, Cloneable {
         if (mAuthenticationType != TYPE_STATICKEYS) {
             if (mCheckRemoteCN) {
                 if (mRemoteCN == null || mRemoteCN.equals(""))
-                    cfg.append("verify-x509-name ").append(openVpnEscape(mConnections[0].mServerName)).append(" name\n");
+                    cfg.append("verify-x509-name ").append(openVpnEscape(mConnections[0].getServerName())).append(" name\n");
                 else
                     switch (mX509AuthType) {
 
@@ -660,7 +665,7 @@ public class VpnProfile implements Serializable, Cloneable {
         if (!canUsePlainRemotes) {
             cfg.append("# Connection Options are at the end to allow global options (and global custom options) to influence connection blocks\n");
             for (Connection conn : mConnections) {
-                if (conn.mEnabled) {
+                if (conn.isEnabled()) {
                     cfg.append("<connection>\n");
                     cfg.append(conn.getConnectionBlock(configForOvpn3));
                     cfg.append("</connection>\n");
@@ -985,7 +990,7 @@ public class VpnProfile implements Serializable, Cloneable {
 
         boolean noRemoteEnabled = true;
         for (Connection c : mConnections) {
-            if (c.mEnabled)
+            if (c.isEnabled())
                 noRemoteEnabled = false;
 
         }
@@ -1000,12 +1005,12 @@ public class VpnProfile implements Serializable, Cloneable {
                 return R.string.openvpn3_pkcs12;
             }
             for (Connection conn : mConnections) {
-                if (conn.mProxyType == Connection.ProxyType.ORBOT || conn.mProxyType == Connection.ProxyType.SOCKS5)
+                if (conn.getProxyType() == Connection.ProxyType.ORBOT || conn.getProxyType() == Connection.ProxyType.SOCKS5)
                     return R.string.openvpn3_socksproxy;
             }
         }
         for (Connection c : mConnections) {
-            if (c.mProxyType == Connection.ProxyType.ORBOT) {
+            if (c.getProxyType() == Connection.ProxyType.ORBOT) {
                 if (usesExtraProxyOptions())
                     return R.string.error_orbot_and_proxy_options;
                 if (!OrbotHelper.checkTorReceier(context))
diff --git a/app/src/main/java/de/blinkt/openvpn/core/ConfigParser.java b/app/src/main/java/de/blinkt/openvpn/core/ConfigParser.java
index 0148bfb7..0e9b1bc4 100644
--- a/app/src/main/java/de/blinkt/openvpn/core/ConfigParser.java
+++ b/app/src/main/java/de/blinkt/openvpn/core/ConfigParser.java
@@ -6,16 +6,24 @@
 package de.blinkt.openvpn.core;
 
 import android.os.Build;
-import android.support.v4.util.Pair;
 import android.text.TextUtils;
+import android.support.v4.util.Pair;
 
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.Reader;
 import java.io.StringReader;
-import java.util.*;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Vector;
 
 import de.blinkt.openvpn.VpnProfile;
+import de.blinkt.openvpn.core.connection.Connection;
+import de.blinkt.openvpn.core.connection.OpenvpnConnection;
 
 //! Openvpn Config FIle Parser, probably not 100% accurate but close enough
 
@@ -142,9 +150,9 @@ public class ConfigParser {
         String data = VpnProfile.getEmbeddedContent(inlinedata);
         String[] parts = data.split("\n");
         if (parts.length >= 2) {
-            c.mProxyAuthUser = parts[0];
-            c.mProxyAuthPassword = parts[1];
-            c.mUseProxyAuth = true;
+            c.setProxyAuthUser(parts[0]);
+            c.setProxyAuthPassword(parts[1]);
+            c.setUseProxyAuth(true);
         }
     }
 
@@ -605,7 +613,7 @@ public class ConfigParser {
         }
 
 
-        if (getOption("nobind", 0, 0) != null)
+        if (getOption("nobind", 0, 1) != null)
             np.mNobind = true;
 
         if (getOption("persist-tun", 0, 0) != null)
@@ -713,8 +721,8 @@ public class ConfigParser {
                 throw new ConfigParseError(String.format("Unknown protocol %s in proto-force", protoToDisable));
 
             for (Connection conn : np.mConnections)
-                if (conn.mUseUdp == disableUDP)
-                    conn.mEnabled = false;
+                if (conn.isUseUdp() == disableUDP)
+                    conn.setEnabled(false);
         }
 
         // Parse OpenVPN Access Server extra
@@ -763,27 +771,27 @@ public class ConfigParser {
                 return null;
             }
         else
-            conn = new Connection();
+            conn = new OpenvpnConnection();
 
         Vector<String> port = getOption("port", 1, 1);
         if (port != null) {
-            conn.mServerPort = port.get(1);
+            conn.setServerPort(port.get(1));
         }
 
         Vector<String> rport = getOption("rport", 1, 1);
         if (rport != null) {
-            conn.mServerPort = rport.get(1);
+            conn.setServerPort(rport.get(1));
         }
 
         Vector<String> proto = getOption("proto", 1, 1);
         if (proto != null) {
-            conn.mUseUdp = isUdpProto(proto.get(1));
+            conn.setUseUdp(isUdpProto(proto.get(1)));
         }
 
         Vector<String> connectTimeout = getOption("connect-timeout", 1, 1);
         if (connectTimeout != null) {
             try {
-                conn.mConnectTimeout = Integer.parseInt(connectTimeout.get(1));
+                conn.setConnectTimeout(Integer.parseInt(connectTimeout.get(1)));
             } catch (NumberFormatException nfe) {
                 throw new ConfigParseError(String.format("Argument to connect-timeout (%s) must to be an integer: %s",
                         connectTimeout.get(1), nfe.getLocalizedMessage()));
@@ -797,16 +805,16 @@ public class ConfigParser {
 
         if (proxy != null) {
             if (proxy.get(0).equals("socks-proxy")) {
-                conn.mProxyType = Connection.ProxyType.SOCKS5;
+                conn.setProxyType(Connection.ProxyType.SOCKS5);
                 // socks defaults to 1080, http always sets port
-                conn.mProxyPort = "1080";
+                conn.setProxyPort("1080");
             } else {
-                conn.mProxyType = Connection.ProxyType.HTTP;
+                conn.setProxyType(Connection.ProxyType.HTTP);
             }
 
-            conn.mProxyName = proxy.get(1);
+            conn.setProxyName(proxy.get(1));
             if (proxy.size() >= 3)
-                conn.mProxyPort = proxy.get(2);
+                conn.setProxyPort(proxy.get(2));
         }
 
         Vector<String> httpproxyauthhttp = getOption("http-proxy-user-pass", 1, 1);
@@ -823,15 +831,15 @@ public class ConfigParser {
         // Assume that we need custom options if connectionDefault are set or in the connection specific set
         for (Map.Entry<String, Vector<Vector<String>>> option : options.entrySet()) {
             if (connDefault != null || connectionOptionsSet.contains(option.getKey())) {
-                conn.mCustomConfiguration += getOptionStrings(option.getValue());
+                conn.setCustomConfiguration(conn.getCustomConfiguration() + getOptionStrings(option.getValue()));
                 optionsToRemove.add(option.getKey());
             }
         }
         for (String o: optionsToRemove)
             options.remove(o);
 
-        if (!(conn.mCustomConfiguration == null || "".equals(conn.mCustomConfiguration.trim())))
-            conn.mUseCustomConfig = true;
+        if (!(conn.getCustomConfiguration() == null || "".equals(conn.getCustomConfiguration().trim())))
+            conn.setUseCustomConfig(true);
 
         // Make remotes empty to simplify code
         if (remotes == null)
@@ -849,11 +857,11 @@ public class ConfigParser {
             }
             switch (remote.size()) {
                 case 4:
-                    connections[i].mUseUdp = isUdpProto(remote.get(3));
+                    connections[i].setUseUdp(isUdpProto(remote.get(3)));
                 case 3:
-                    connections[i].mServerPort = remote.get(2);
+                    connections[i].setServerPort(remote.get(2));
                 case 2:
-                    connections[i].mServerName = remote.get(1);
+                    connections[i].setServerName(remote.get(1));
             }
             i++;
         }
diff --git a/app/src/main/java/de/blinkt/openvpn/core/ConnectionInterface.java b/app/src/main/java/de/blinkt/openvpn/core/ConnectionInterface.java
new file mode 100644
index 00000000..70b4b4ec
--- /dev/null
+++ b/app/src/main/java/de/blinkt/openvpn/core/ConnectionInterface.java
@@ -0,0 +1,15 @@
+package de.blinkt.openvpn.core;
+
+import java.io.Serializable;
+
+/**
+ * Created by cyberta on 11.03.19.
+ */
+
+public interface ConnectionInterface {
+
+    String getConnectionBlock(boolean isOpenVPN3);
+    boolean usesExtraProxyOptions();
+    boolean isOnlyRemote();
+     int getTimeout();
+}
diff --git a/app/src/main/java/de/blinkt/openvpn/core/NativeUtils.java b/app/src/main/java/de/blinkt/openvpn/core/NativeUtils.java
index 6b633c34..a66b7b51 100644
--- a/app/src/main/java/de/blinkt/openvpn/core/NativeUtils.java
+++ b/app/src/main/java/de/blinkt/openvpn/core/NativeUtils.java
@@ -20,6 +20,8 @@ public class NativeUtils {
     {
         if (isRoboUnitTest())
             return "ROBO";
+        else if (isUnitTest())
+            return "JUNIT";
         else
             return getJNIAPI();
     }
@@ -34,7 +36,7 @@ public class NativeUtils {
     public static native double[] getOpenSSLSpeed(String algorithm, int testnum);
 
     static {
-        if (!isRoboUnitTest()) {
+        if (!isRoboUnitTest() && !isUnitTest()) {
             System.loadLibrary("opvpnutil");
             if (Build.VERSION.SDK_INT == Build.VERSION_CODES.JELLY_BEAN)
                 System.loadLibrary("jbcrypto");
@@ -44,4 +46,13 @@ public class NativeUtils {
     public static boolean isRoboUnitTest() {
         return "robolectric".equals(Build.FINGERPRINT);
     }
+
+    public static boolean isUnitTest() {
+        try {
+            Class.forName("se.leap.bitmaskclient.testutils.MockHelper");
+            return true;
+        } catch (ClassNotFoundException e) {
+            return false;
+        }
+    }
 }
diff --git a/app/src/main/java/de/blinkt/openvpn/core/OpenVPNService.java b/app/src/main/java/de/blinkt/openvpn/core/OpenVPNService.java
index 82c4e1df..55a92cb0 100644
--- a/app/src/main/java/de/blinkt/openvpn/core/OpenVPNService.java
+++ b/app/src/main/java/de/blinkt/openvpn/core/OpenVPNService.java
@@ -42,9 +42,13 @@ import java.util.Vector;
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.VpnStatus.ByteCountListener;
 import de.blinkt.openvpn.core.VpnStatus.StateListener;
+import de.blinkt.openvpn.core.connection.Connection;
 import se.leap.bitmaskclient.R;
 import se.leap.bitmaskclient.VpnNotificationManager;
+import se.leap.bitmaskclient.pluggableTransports.Dispatcher;
+import de.blinkt.openvpn.core.connection.Obfs4Connection;
 
+import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4;
 import static de.blinkt.openvpn.core.ConnectionStatus.LEVEL_CONNECTED;
 import static de.blinkt.openvpn.core.ConnectionStatus.LEVEL_WAITING_FOR_USER_INPUT;
 import static de.blinkt.openvpn.core.NetworkSpace.IpAddress;
@@ -52,6 +56,7 @@ import static se.leap.bitmaskclient.Constants.PROVIDER_PROFILE;
 
 
 public class OpenVPNService extends VpnService implements StateListener, Callback, ByteCountListener, IOpenVPNServiceInternal, VpnNotificationManager.VpnServiceCallback {
+    public static final String TAG = OpenVPNService.class.getSimpleName();
     public static final String START_SERVICE = "de.blinkt.openvpn.START_SERVICE";
     public static final String START_SERVICE_STICKY = "de.blinkt.openvpn.START_SERVICE_STICKY";
     public static final String ALWAYS_SHOW_NOTIFICATION = "de.blinkt.openvpn.NOTIFICATION_ALWAYS_VISIBLE";
@@ -85,6 +90,7 @@ public class OpenVPNService extends VpnService implements StateListener, Callbac
     private Toast mlastToast;
     private Runnable mOpenVPNThread;
     private VpnNotificationManager notificationManager;
+    private Dispatcher dispatcher;
 
     private static final int PRIORITY_MIN = -2;
     private static final int PRIORITY_DEFAULT = 0;
@@ -242,6 +248,9 @@ public class OpenVPNService extends VpnService implements StateListener, Callbac
         if(isVpnRunning()) {
             if (getManagement() != null && getManagement().stopVPN(replaceConnection)) {
                 if (!replaceConnection) {
+                    if (dispatcher.isRunning()) {
+                        dispatcher.stop();
+                    }
                     VpnStatus.updateStateString("NOPROCESS", "VPN STOPPED", R.string.state_noprocess, ConnectionStatus.LEVEL_NOTCONNECTED);
                 }
                 return true;
@@ -249,6 +258,9 @@ public class OpenVPNService extends VpnService implements StateListener, Callbac
             return false;
         } else {
             if (!replaceConnection) {
+                if (dispatcher.isRunning()) {
+                    dispatcher.stop();
+                }
                 VpnStatus.updateStateString("NOPROCESS", "VPN STOPPED", R.string.state_noprocess, ConnectionStatus.LEVEL_NOTCONNECTED);
                 return true;
             }
@@ -366,6 +378,36 @@ public class OpenVPNService extends VpnService implements StateListener, Callbac
         /**
          * see change above (l. 292 ff)
          */
+        //TODO: investigate how connections[n] with n>0 get called during vpn setup (on connection refused?)
+        // Do we need to check if there's any obfs4 connection in mProfile.mConnections and start
+        // the dispatcher here? Can we start the dispatcher at a later point of execution, e.g. when
+        // connections[n], n>0 gets choosen?
+
+        VpnStatus.logInfo("Setting up dispatcher.");
+        Connection connection = mProfile.mConnections[0];
+
+        if (connection.getTransportType() == OBFS4) {
+            Obfs4Connection obfs4Connection = (Obfs4Connection) connection;
+            dispatcher = new Dispatcher(this,
+                    obfs4Connection.getmObfs4RemoteProxyName(),
+                    obfs4Connection.getmObfs4RemoteProxyPort(),
+                    obfs4Connection.getmObfs4Certificate(),
+                    obfs4Connection.getmObfs4IatMode());
+            dispatcher.initSync();
+
+            if (dispatcher.getPort() != null && dispatcher.getPort().length() > 0) {
+                connection.setServerPort(dispatcher.getPort());
+                Log.d(TAG, "Dispatcher running. Profile server name and port: " +
+                        connection.getServerName() + ":" + connection.getServerPort());
+                VpnStatus.logInfo("Dispatcher running. Profile server name and port: " +
+                        connection.getServerName() + ":" + connection.getServerPort());
+            } else {
+                Log.e(TAG, "Cannot initialize dispatcher for obfs4 connection. Shutting down.");
+                VpnStatus.logError("Cannot initialize dispatcher for obfs4 connection. Shutting down.");
+            }
+        }
+
+
         VpnStatus.logInfo(R.string.building_configration);
         VpnStatus.updateStateString("VPN_GENERATE_CONFIG", "", R.string.building_configration, ConnectionStatus.LEVEL_START);
 
@@ -743,7 +785,7 @@ public class OpenVPNService extends VpnService implements StateListener, Callbac
         boolean profileUsesOrBot = false;
 
         for (Connection c : mProfile.mConnections) {
-            if (c.mProxyType == Connection.ProxyType.ORBOT)
+            if (c.getProxyType() == Connection.ProxyType.ORBOT)
                 profileUsesOrBot = true;
         }
 
diff --git a/app/src/main/java/de/blinkt/openvpn/core/OpenVpnManagementThread.java b/app/src/main/java/de/blinkt/openvpn/core/OpenVpnManagementThread.java
index 4f7a5bda..91cc66bc 100644
--- a/app/src/main/java/de/blinkt/openvpn/core/OpenVpnManagementThread.java
+++ b/app/src/main/java/de/blinkt/openvpn/core/OpenVpnManagementThread.java
@@ -15,9 +15,10 @@ import android.os.Handler;
 import android.os.ParcelFileDescriptor;
 import android.support.annotation.NonNull;
 import android.support.annotation.RequiresApi;
-import android.system.ErrnoException;
 import android.system.Os;
 import android.util.Log;
+
+import de.blinkt.openvpn.core.connection.Connection;
 import se.leap.bitmaskclient.R;
 import de.blinkt.openvpn.VpnProfile;
 
@@ -452,10 +453,10 @@ public class OpenVpnManagementThread implements Runnable, OpenVPNManagement {
 
         if (mProfile.mConnections.length > connectionEntryNumber) {
             Connection connection = mProfile.mConnections[connectionEntryNumber];
-            proxyType = connection.mProxyType;
-            proxyname = connection.mProxyName;
-            proxyport = connection.mProxyPort;
-            proxyUseAuth = connection.mUseProxyAuth;
+            proxyType = connection.getProxyType();
+            proxyname = connection.getProxyName();
+            proxyport = connection.getProxyPort();
+            proxyUseAuth = connection.isUseProxyAuth();
 
             // Use transient variable to remember http user/password
             mCurrentProxyConnection = connection;
@@ -696,8 +697,8 @@ public class OpenVpnManagementThread implements Runnable, OpenVPNManagement {
 
         } else if (needed.equals("HTTP Proxy")) {
             if( mCurrentProxyConnection != null) {
-                pw = mCurrentProxyConnection.mProxyAuthPassword;
-                username = mCurrentProxyConnection.mProxyAuthUser;
+                pw = mCurrentProxyConnection.getProxyAuthPassword();
+                username = mCurrentProxyConnection.getProxyAuthUser();
             }
         }
         if (pw != null) {
@@ -782,7 +783,6 @@ public class OpenVpnManagementThread implements Runnable, OpenVPNManagement {
         boolean stopSucceed = stopOpenVPN();
         if (stopSucceed) {
             mShuttingDown = true;
-
         }
         return stopSucceed;
     }
diff --git a/app/src/main/java/de/blinkt/openvpn/core/connection/Connection.java b/app/src/main/java/de/blinkt/openvpn/core/connection/Connection.java
new file mode 100644
index 00000000..f333a13e
--- /dev/null
+++ b/app/src/main/java/de/blinkt/openvpn/core/connection/Connection.java
@@ -0,0 +1,207 @@
+/*
+ * Copyright (c) 2012-2016 Arne Schwabe
+ * Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
+ */
+
+package de.blinkt.openvpn.core.connection;
+
+import android.text.TextUtils;
+
+import java.io.Serializable;
+import java.util.Locale;
+
+public abstract class Connection implements Serializable, Cloneable {
+    private String mServerName = "openvpn.example.com";
+    private String mServerPort = "1194";
+    private boolean mUseUdp = true;
+    private String mCustomConfiguration = "";
+    private boolean mUseCustomConfig = false;
+    private boolean mEnabled = true;
+    private int mConnectTimeout = 0;
+    private static final int CONNECTION_DEFAULT_TIMEOUT = 120;
+    private ProxyType mProxyType = ProxyType.NONE;
+    private String mProxyName = "proxy.example.com";
+    private String mProxyPort = "8080";
+
+    private boolean mUseProxyAuth;
+    private String mProxyAuthUser = null;
+    private String mProxyAuthPassword = null;
+
+    public enum ProxyType {
+        NONE,
+        HTTP,
+        SOCKS5,
+        ORBOT
+    }
+
+    public enum TransportType {
+        OBFS4,
+        OPENVPN
+    }
+
+    private static final long serialVersionUID = 92031902903829089L;
+
+
+    public String getConnectionBlock(boolean isOpenVPN3) {
+        String cfg = "";
+
+        // Server Address
+        cfg += "remote ";
+        cfg += mServerName;
+        cfg += " ";
+        cfg += mServerPort;
+        if (mUseUdp)
+            cfg += " udp\n";
+        else
+            cfg += " tcp-client\n";
+
+        if (mConnectTimeout != 0)
+            cfg += String.format(Locale.US, " connect-timeout  %d\n", mConnectTimeout);
+
+        // OpenVPN 2.x manages proxy connection via management interface
+        if ((isOpenVPN3 || usesExtraProxyOptions()) && mProxyType == ProxyType.HTTP)
+        {
+            cfg+=String.format(Locale.US,"http-proxy %s %s\n", mProxyName, mProxyPort);
+            if (mUseProxyAuth)
+                cfg+=String.format(Locale.US, "<http-proxy-user-pass>\n%s\n%s\n</http-proxy-user-pass>\n", mProxyAuthUser, mProxyAuthPassword);
+        }
+        if (usesExtraProxyOptions() && mProxyType == ProxyType.SOCKS5) {
+            cfg+=String.format(Locale.US,"socks-proxy %s %s\n", mProxyName, mProxyPort);
+        }
+
+        if (!TextUtils.isEmpty(mCustomConfiguration) && mUseCustomConfig) {
+            cfg += mCustomConfiguration;
+            cfg += "\n";
+        }
+
+
+        return cfg;
+    }
+
+    public boolean usesExtraProxyOptions() {
+        return (mUseCustomConfig && mCustomConfiguration.contains("http-proxy-option "));
+    }
+
+
+    @Override
+    public Connection clone() throws CloneNotSupportedException {
+        return (Connection) super.clone();
+    }
+
+    public boolean isOnlyRemote() {
+        return TextUtils.isEmpty(mCustomConfiguration) || !mUseCustomConfig;
+    }
+
+    public int getTimeout() {
+        if (mConnectTimeout <= 0)
+            return CONNECTION_DEFAULT_TIMEOUT;
+        else
+            return mConnectTimeout;
+    }
+
+    public String getServerName() {
+        return mServerName;
+    }
+
+    public void setServerName(String mServerName) {
+        this.mServerName = mServerName;
+    }
+
+    public String getServerPort() {
+        return mServerPort;
+    }
+
+    public void setServerPort(String serverPort) {
+        this.mServerPort = serverPort;
+    }
+
+    public boolean isUseUdp() {
+        return mUseUdp;
+    }
+
+    public void setUseUdp(boolean useUdp) {
+        this.mUseUdp = useUdp;
+    }
+
+    public String getCustomConfiguration() {
+        return mCustomConfiguration;
+    }
+
+    public void setCustomConfiguration(String customConfiguration) {
+        this.mCustomConfiguration = customConfiguration;
+    }
+
+    public boolean isUseCustomConfig() {
+        return mUseCustomConfig;
+    }
+
+    public void setUseCustomConfig(boolean useCustomConfig) {
+        this.mUseCustomConfig = useCustomConfig;
+    }
+
+    public boolean isEnabled() {
+        return mEnabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.mEnabled = enabled;
+    }
+
+    public int getConnectTimeout() {
+        return mConnectTimeout;
+    }
+
+    public void setConnectTimeout(int connectTimeout) {
+        this.mConnectTimeout = connectTimeout;
+    }
+
+    public ProxyType getProxyType() {
+        return mProxyType;
+    }
+
+    public void setProxyType(ProxyType proxyType) {
+        this.mProxyType = proxyType;
+    }
+
+    public String getProxyName() {
+        return mProxyName;
+    }
+
+    public void setProxyName(String proxyName) {
+        this.mProxyName = proxyName;
+    }
+
+    public String getProxyPort() {
+        return mProxyPort;
+    }
+
+    public void setProxyPort(String proxyPort) {
+        this.mProxyPort = proxyPort;
+    }
+
+    public boolean isUseProxyAuth() {
+        return mUseProxyAuth;
+    }
+
+    public void setUseProxyAuth(boolean useProxyAuth) {
+        this.mUseProxyAuth = useProxyAuth;
+    }
+
+    public String getProxyAuthUser() {
+        return mProxyAuthUser;
+    }
+
+    public void setProxyAuthUser(String proxyAuthUser) {
+        this.mProxyAuthUser = proxyAuthUser;
+    }
+
+    public String getProxyAuthPassword() {
+        return mProxyAuthPassword;
+    }
+
+    public void setProxyAuthPassword(String proxyAuthPassword) {
+        this.mProxyAuthPassword = proxyAuthPassword;
+    }
+
+    public abstract TransportType getTransportType();
+}
diff --git a/app/src/main/java/de/blinkt/openvpn/core/connection/Obfs4Connection.java b/app/src/main/java/de/blinkt/openvpn/core/connection/Obfs4Connection.java
new file mode 100644
index 00000000..790b8b1a
--- /dev/null
+++ b/app/src/main/java/de/blinkt/openvpn/core/connection/Obfs4Connection.java
@@ -0,0 +1,83 @@
+package de.blinkt.openvpn.core.connection;
+
+import org.json.JSONObject;
+
+/**
+ * Created by cyberta on 08.03.19.
+ */
+
+public class Obfs4Connection extends Connection {
+
+    private static final String TAG = Obfs4Connection.class.getName();
+
+
+    private String mObfs4RemoteProxyName = "";
+    private String mObfs4RemoteProxyPort = "";
+    private String mObfs4Certificate = "";
+    private String mObfs4IatMode = "";
+
+    public Obfs4Connection() {
+        setDefaults();
+    }
+
+    public Obfs4Connection(Connection connection) {
+        mObfs4RemoteProxyName = connection.getServerName();
+        setConnectTimeout(connection.getConnectTimeout());
+        setCustomConfiguration(connection.getCustomConfiguration());
+        setUseCustomConfig(connection.isUseCustomConfig());
+
+        setDefaults();
+    }
+
+    private void setDefaults() {
+        setUseUdp(false);
+        setServerName("127.0.0.1");
+        setServerPort("");
+        setProxyName("");
+        setProxyPort("");
+        setProxyAuthUser(null);
+        setProxyAuthPassword(null);
+        setProxyType(ProxyType.NONE);
+        setUseProxyAuth(false);
+    }
+
+    public void setTransportOptions(JSONObject jsonObject) {
+        mObfs4Certificate = jsonObject.optString("cert");
+        mObfs4IatMode = jsonObject.optString("iat-mode");
+    }
+
+    @Override
+    public Connection clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    @Override
+    public TransportType getTransportType() {
+        return TransportType.OBFS4;
+    }
+
+    public String getmObfs4RemoteProxyName() {
+        return mObfs4RemoteProxyName;
+    }
+
+    public void setObfs4RemoteProxyName(String mObfs4RemoteProxyName) {
+        this.mObfs4RemoteProxyName = mObfs4RemoteProxyName;
+    }
+
+    public String getmObfs4RemoteProxyPort() {
+        return mObfs4RemoteProxyPort;
+    }
+
+    public void setObfs4RemoteProxyPort(String mObfs4RemoteProxyPort) {
+        this.mObfs4RemoteProxyPort = mObfs4RemoteProxyPort;
+    }
+
+    public String getmObfs4Certificate() {
+        return mObfs4Certificate;
+    }
+
+    public String getmObfs4IatMode() {
+        return mObfs4IatMode;
+    }
+
+}
diff --git a/app/src/main/java/de/blinkt/openvpn/core/connection/OpenvpnConnection.java b/app/src/main/java/de/blinkt/openvpn/core/connection/OpenvpnConnection.java
new file mode 100644
index 00000000..3a3fd0c3
--- /dev/null
+++ b/app/src/main/java/de/blinkt/openvpn/core/connection/OpenvpnConnection.java
@@ -0,0 +1,13 @@
+package de.blinkt.openvpn.core.connection;
+
+/**
+ * Created by cyberta on 11.03.19.
+ */
+
+public class OpenvpnConnection extends Connection {
+
+    @Override
+    public TransportType getTransportType() {
+        return TransportType.OPENVPN;
+    }
+}
diff --git a/app/src/main/java/se/leap/bitmaskclient/Constants.java b/app/src/main/java/se/leap/bitmaskclient/Constants.java
index 42df6d1d..7503d29f 100644
--- a/app/src/main/java/se/leap/bitmaskclient/Constants.java
+++ b/app/src/main/java/se/leap/bitmaskclient/Constants.java
@@ -113,4 +113,22 @@ public interface Constants {
     String FIRST_TIME_USER_DATE = "first_time_user_date";
 
 
+    //////////////////////////////////////////////
+    // JSON KEYS
+    /////////////////////////////////////////////
+    String IP_ADDRESS = "ip_address";
+    String REMOTE = "remote";
+    String PORTS = "ports";
+    String PROTOCOLS = "protocols";
+    String CAPABILITIES = "capabilities";
+    String TRANSPORT = "transport";
+    String TYPE = "type";
+    String OPTIONS = "options";
+    String VERSION = "version";
+    String NAME = "name";
+    String TIMEZONE = "timezone";
+    String LOCATIONS = "locations";
+    String LOCATION = "location";
+    String OPENVPN_CONFIGURATION = "openvpn_configuration";
+    String GATEWAYS = "gateways";
 }
diff --git a/app/src/main/java/se/leap/bitmaskclient/StartActivity.java b/app/src/main/java/se/leap/bitmaskclient/StartActivity.java
index d8aca351..945429fd 100644
--- a/app/src/main/java/se/leap/bitmaskclient/StartActivity.java
+++ b/app/src/main/java/se/leap/bitmaskclient/StartActivity.java
@@ -25,20 +25,36 @@ import android.support.annotation.IntDef;
 import android.support.annotation.Nullable;
 import android.util.Log;
 
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
+import de.blinkt.openvpn.core.Preferences;
 import de.blinkt.openvpn.core.VpnStatus;
 import se.leap.bitmaskclient.eip.EipCommand;
+import se.leap.bitmaskclient.utils.PreferenceHelper;
 
+import static se.leap.bitmaskclient.BuildConfig.useDemoConfig;
 import static se.leap.bitmaskclient.Constants.APP_ACTION_CONFIGURE_ALWAYS_ON_PROFILE;
 import static se.leap.bitmaskclient.Constants.EIP_RESTART_ON_BOOT;
 import static se.leap.bitmaskclient.Constants.PREFERENCES_APP_VERSION;
+import static se.leap.bitmaskclient.Constants.PROVIDER_CONFIGURED;
 import static se.leap.bitmaskclient.Constants.PROVIDER_EIP_DEFINITION;
 import static se.leap.bitmaskclient.Constants.PROVIDER_KEY;
+import static se.leap.bitmaskclient.Constants.PROVIDER_PRIVATE_KEY;
+import static se.leap.bitmaskclient.Constants.PROVIDER_VPN_CERTIFICATE;
 import static se.leap.bitmaskclient.Constants.REQUEST_CODE_CONFIGURE_LEAP;
 import static se.leap.bitmaskclient.Constants.SHARED_PREFERENCES;
 import static se.leap.bitmaskclient.MainActivity.ACTION_SHOW_VPN_FRAGMENT;
+import static se.leap.bitmaskclient.Provider.CA_CERT;
+import static se.leap.bitmaskclient.Provider.MAIN_URL;
 import static se.leap.bitmaskclient.utils.ConfigHelper.isDefaultBitmask;
 import static se.leap.bitmaskclient.utils.PreferenceHelper.getSavedProviderFromSharedPreferences;
 import static se.leap.bitmaskclient.utils.PreferenceHelper.providerInSharedPreferences;
@@ -90,6 +106,10 @@ public class StartActivity extends Activity{
         // initialize app necessities
         VpnStatus.initLogCache(getApplicationContext().getCacheDir());
 
+        if (useDemoConfig) {
+            demoSetup();
+        }
+
         prepareEIP();
 
     }
@@ -162,8 +182,8 @@ public class StartActivity extends Activity{
     }
 
     private void prepareEIP() {
-        boolean provider_exists = providerInSharedPreferences(preferences);
-        if (provider_exists) {
+        boolean providerExists = providerInSharedPreferences(preferences);
+        if (providerExists) {
             Provider provider = getSavedProviderFromSharedPreferences(preferences);
             if(!provider.isConfigured()) {
                 configureLeapProvider();
@@ -216,4 +236,65 @@ public class StartActivity extends Activity{
         finish();
     }
 
+    private String getInputAsString(InputStream fileAsInputStream) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(fileAsInputStream));
+        StringBuilder sb = new StringBuilder();
+        String line = br.readLine();
+        while (line != null) {
+            sb.append(line);
+            line = br.readLine();
+        }
+
+        return sb.toString();
+    }
+
+    private void demoSetup() {
+        try {
+            //set demo data
+            String demoEipServiceJson = getInputAsString(getAssets().open("ptdemo.bitmask.eip-service.json"));
+            String secrets = getInputAsString(getAssets().open("ptdemo.bitmask.secrets.json"));
+            String provider = getInputAsString(getAssets().open("ptdemo.bitmask.net.json"));
+
+            Log.d(TAG, "setup provider: " + provider);
+            Log.d(TAG, "setup eip json: " + demoEipServiceJson);
+            JSONObject secretsJson = new JSONObject(secrets);
+
+            preferences.edit().putString(PROVIDER_EIP_DEFINITION+".demo.bitmask.net", demoEipServiceJson).
+                    putString(PROVIDER_EIP_DEFINITION, demoEipServiceJson).
+                    putString(CA_CERT, secretsJson.getString(CA_CERT)).
+                    putString(PROVIDER_PRIVATE_KEY, secretsJson.getString(PROVIDER_PRIVATE_KEY)).
+                    putString(PROVIDER_VPN_CERTIFICATE, secretsJson.getString(PROVIDER_VPN_CERTIFICATE)).
+                    putString(Provider.KEY, provider).
+                    putString(MAIN_URL, "https://demo.bitmask.net").
+                    putBoolean(PROVIDER_CONFIGURED, true).commit();
+
+            PreferenceHelper.getSavedProviderFromSharedPreferences(preferences);
+            ProviderObservable.getInstance().updateProvider(PreferenceHelper.getSavedProviderFromSharedPreferences(preferences));
+
+            // remove last used profiles
+            SharedPreferences prefs = Preferences.getDefaultSharedPreferences(this);
+            SharedPreferences.Editor prefsedit = prefs.edit();
+            prefsedit.remove("lastConnectedProfile").commit();
+            File f  = new File(this.getCacheDir().getAbsolutePath() + "/android.conf");
+            if (f.exists()) {
+                Log.d(TAG, "android.conf exists -> delete:" + f.delete());
+            }
+
+            File filesDirectory = new File(this.getFilesDir().getAbsolutePath());
+            if (filesDirectory.exists() && filesDirectory.isDirectory()) {
+                File[] filesInDirectory = filesDirectory.listFiles();
+                for (File file : filesInDirectory) {
+                    Log.d(TAG, "delete profile: " + file.getName() + ": "+ file.delete());
+
+                }
+            } else Log.d(TAG, "file folder doesn't exist");
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (JSONException e) {
+            e.printStackTrace();
+        }
+
+    }
+
 }
diff --git a/app/src/main/java/se/leap/bitmaskclient/eip/Gateway.java b/app/src/main/java/se/leap/bitmaskclient/eip/Gateway.java
index 55ade1ae..b1554af0 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/Gateway.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/Gateway.java
@@ -22,11 +22,17 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.io.IOException;
-import java.io.StringReader;
 
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.ConfigParser;
 
+import static se.leap.bitmaskclient.Constants.LOCATION;
+import static se.leap.bitmaskclient.Constants.LOCATIONS;
+import static se.leap.bitmaskclient.Constants.NAME;
+import static se.leap.bitmaskclient.Constants.OPENVPN_CONFIGURATION;
+import static se.leap.bitmaskclient.Constants.TIMEZONE;
+import static se.leap.bitmaskclient.Constants.VERSION;
+
 /**
  * Gateway provides objects defining gateways and their metadata.
  * Each instance contains a VpnProfile for OpenVPN specific data and member
@@ -34,6 +40,7 @@ import de.blinkt.openvpn.core.ConfigParser;
  *
  * @author Sean Leonard <meanderingcode@aetherislands.net>
  * @author Parménides GV <parmegv@sdf.org>
+ * @author cyberta
  */
 public class Gateway {
 
@@ -44,50 +51,57 @@ public class Gateway {
     private JSONObject secrets;
     private JSONObject gateway;
 
-    private String mName;
+    private String name;
     private int timezone;
-    private VpnProfile mVpnProfile;
+    private int apiVersion;
+    private VpnProfile vpnProfile;
 
     /**
      * Build a gateway object from a JSON OpenVPN gateway definition in eip-service.json
      * and create a VpnProfile belonging to it.
      */
-    public Gateway(JSONObject eip_definition, JSONObject secrets, JSONObject gateway) {
+    public Gateway(JSONObject eipDefinition, JSONObject secrets, JSONObject gateway) {
 
         this.gateway = gateway;
         this.secrets = secrets;
 
-        generalConfiguration = getGeneralConfiguration(eip_definition);
-        timezone = getTimezone(eip_definition);
-        mName = locationAsName(eip_definition);
-
-        mVpnProfile = createVPNProfile();
-        mVpnProfile.mName = mName;
+        generalConfiguration = getGeneralConfiguration(eipDefinition);
+        timezone = getTimezone(eipDefinition);
+        name = locationAsName(eipDefinition);
+        apiVersion = getApiVersion(eipDefinition);
+        vpnProfile = createVPNProfile();
+        if (vpnProfile != null) {
+            vpnProfile.mName = name;
+        }
     }
 
-    private JSONObject getGeneralConfiguration(JSONObject eip_definition) {
+    private JSONObject getGeneralConfiguration(JSONObject eipDefinition) {
         try {
-            return eip_definition.getJSONObject("openvpn_configuration");
+            return eipDefinition.getJSONObject(OPENVPN_CONFIGURATION);
         } catch (JSONException e) {
             return new JSONObject();
         }
     }
 
-    private int getTimezone(JSONObject eip_definition) {
-        JSONObject location = getLocationInfo(eip_definition);
-        return location.optInt("timezone");
+    private int getTimezone(JSONObject eipDefinition) {
+        JSONObject location = getLocationInfo(eipDefinition);
+        return location.optInt(TIMEZONE);
+    }
+
+    private int getApiVersion(JSONObject eipDefinition) {
+        return eipDefinition.optInt(VERSION);
     }
 
-    private String locationAsName(JSONObject eip_definition) {
-        JSONObject location = getLocationInfo(eip_definition);
-        return location.optString("name");
+    private String locationAsName(JSONObject eipDefinition) {
+        JSONObject location = getLocationInfo(eipDefinition);
+        return location.optString(NAME);
     }
 
     private JSONObject getLocationInfo(JSONObject eipDefinition) {
         try {
-            JSONObject locations = eipDefinition.getJSONObject("locations");
+            JSONObject locations = eipDefinition.getJSONObject(LOCATIONS);
 
-            return locations.getJSONObject(gateway.getString("location"));
+            return locations.getJSONObject(gateway.getString(LOCATION));
         } catch (JSONException e) {
             return new JSONObject();
         }
@@ -98,18 +112,9 @@ public class Gateway {
      */
     private VpnProfile createVPNProfile() {
         try {
-            ConfigParser cp = new ConfigParser();
-
-            VpnConfigGenerator vpnConfigurationGenerator = new VpnConfigGenerator(generalConfiguration, secrets, gateway);
-            String configuration = vpnConfigurationGenerator.generate();
-
-            cp.parseConfig(new StringReader(configuration));
-            return cp.convertProfile();
-        } catch (ConfigParser.ConfigParseError e) {
-            // FIXME We didn't get a VpnProfile!  Error handling! and log level
-            e.printStackTrace();
-            return null;
-        } catch (IOException e) {
+            VpnConfigGenerator vpnConfigurationGenerator = new VpnConfigGenerator(generalConfiguration, secrets, gateway, apiVersion);
+            return vpnConfigurationGenerator.generateVpnProfile();
+        } catch (ConfigParser.ConfigParseError | IOException | CloneNotSupportedException | JSONException e) {
             // FIXME We didn't get a VpnProfile!  Error handling! and log level
             e.printStackTrace();
             return null;
@@ -117,11 +122,11 @@ public class Gateway {
     }
 
     public String getName() {
-        return mName;
+        return name;
     }
 
     public VpnProfile getProfile() {
-        return mVpnProfile;
+        return vpnProfile;
     }
 
     public int getTimezone() {
diff --git a/app/src/main/java/se/leap/bitmaskclient/eip/GatewaySelector.java b/app/src/main/java/se/leap/bitmaskclient/eip/GatewaySelector.java
index 2bd666bf..0ba0f207 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/GatewaySelector.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/GatewaySelector.java
@@ -36,7 +36,7 @@ public class GatewaySelector {
             }
         }
 
-        Log.e(TAG, "There are less than " + nClosest + " Gateways available.");
+        Log.e(TAG, "There are less than " + (nClosest + 1) + " Gateways available.");
         return null;
     }
 
diff --git a/app/src/main/java/se/leap/bitmaskclient/eip/GatewaysManager.java b/app/src/main/java/se/leap/bitmaskclient/eip/GatewaysManager.java
index 060843fd..c650938c 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/GatewaysManager.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/GatewaysManager.java
@@ -30,11 +30,18 @@ import java.lang.reflect.Type;
 import java.util.ArrayList;
 import java.util.List;
 
+import de.blinkt.openvpn.VpnProfile;
+import de.blinkt.openvpn.core.connection.Connection;
 import se.leap.bitmaskclient.Provider;
 import se.leap.bitmaskclient.utils.PreferenceHelper;
 
+import static se.leap.bitmaskclient.Constants.CAPABILITIES;
+import static se.leap.bitmaskclient.Constants.GATEWAYS;
 import static se.leap.bitmaskclient.Constants.PROVIDER_PRIVATE_KEY;
 import static se.leap.bitmaskclient.Constants.PROVIDER_VPN_CERTIFICATE;
+import static se.leap.bitmaskclient.Constants.TRANSPORT;
+import static se.leap.bitmaskclient.Constants.TYPE;
+import static se.leap.bitmaskclient.Constants.VERSION;
 
 /**
  * @author parmegv
@@ -88,10 +95,11 @@ public class GatewaysManager {
      */
     void fromEipServiceJson(JSONObject eipDefinition) {
         try {
-            JSONArray gatewaysDefined = eipDefinition.getJSONArray("gateways");
+            JSONArray gatewaysDefined = eipDefinition.getJSONArray(GATEWAYS);
+            int apiVersion = eipDefinition.getInt(VERSION);
             for (int i = 0; i < gatewaysDefined.length(); i++) {
                 JSONObject gw = gatewaysDefined.getJSONObject(i);
-                if (isOpenVpnGateway(gw)) {
+                if (isOpenVpnGateway(gw, apiVersion)) {
                     JSONObject secrets = secretsConfiguration();
                     Gateway aux = new Gateway(eipDefinition, secrets, gw);
                     if (!gateways.contains(aux)) {
@@ -110,12 +118,29 @@ public class GatewaysManager {
      * @param gateway to check
      * @return true if gateway is an OpenVpn gateway otherwise false
      */
-    private boolean isOpenVpnGateway(JSONObject gateway) {
-        try {
-            String transport = gateway.getJSONObject("capabilities").getJSONArray("transport").toString();
-            return transport.contains("openvpn");
-        } catch (JSONException e) {
-            return false;
+    private boolean isOpenVpnGateway(JSONObject gateway, int apiVersion) {
+        switch (apiVersion) {
+            default:
+            case 1:
+                try {
+                    String transport = gateway.getJSONObject(CAPABILITIES).getJSONArray(TRANSPORT).toString();
+                    return transport.contains("openvpn");
+                } catch (JSONException e) {
+                    return false;
+                }
+            case 2:
+                try {
+                    JSONArray transports = gateway.getJSONObject(CAPABILITIES).getJSONArray(TRANSPORT);
+                    for (int i = 0; i < transports.length(); i++) {
+                        JSONObject transport = transports.getJSONObject(i);
+                        if (transport.optString(TYPE).equals("openvpn")) {
+                            return true;
+                        }
+                    }
+                    return false;
+                } catch (JSONException e) {
+                    return false;
+                }
         }
     }
 
diff --git a/app/src/main/java/se/leap/bitmaskclient/eip/VpnConfigGenerator.java b/app/src/main/java/se/leap/bitmaskclient/eip/VpnConfigGenerator.java
index 6f0ccf18..7f09d21e 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/VpnConfigGenerator.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/VpnConfigGenerator.java
@@ -20,48 +20,133 @@ import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.io.IOException;
+import java.io.StringReader;
 import java.util.Iterator;
 
+import de.blinkt.openvpn.VpnProfile;
+import de.blinkt.openvpn.core.ConfigParser;
+import de.blinkt.openvpn.core.connection.Connection;
+import de.blinkt.openvpn.core.connection.Obfs4Connection;
 import se.leap.bitmaskclient.Provider;
 
+import static se.leap.bitmaskclient.Constants.CAPABILITIES;
+import static se.leap.bitmaskclient.Constants.IP_ADDRESS;
+import static se.leap.bitmaskclient.Constants.OPTIONS;
+import static se.leap.bitmaskclient.Constants.PORTS;
+import static se.leap.bitmaskclient.Constants.PROTOCOLS;
 import static se.leap.bitmaskclient.Constants.PROVIDER_PRIVATE_KEY;
 import static se.leap.bitmaskclient.Constants.PROVIDER_VPN_CERTIFICATE;
+import static se.leap.bitmaskclient.Constants.REMOTE;
+import static se.leap.bitmaskclient.Constants.TRANSPORT;
+import static se.leap.bitmaskclient.Constants.TYPE;
 
 public class VpnConfigGenerator {
 
-    private JSONObject general_configuration;
+    private JSONObject generalConfiguration;
     private JSONObject gateway;
     private JSONObject secrets;
+    private JSONObject obfs4Transport;
+    private int apiVersion;
+
+    private ConfigParser icsOpenvpnConfigParser = new ConfigParser();
+
 
     public final static String TAG = VpnConfigGenerator.class.getSimpleName();
     private final String newLine = System.getProperty("line.separator"); // Platform new line
 
-    public VpnConfigGenerator(JSONObject general_configuration, JSONObject secrets, JSONObject gateway) {
-        this.general_configuration = general_configuration;
+    public VpnConfigGenerator(JSONObject generalConfiguration, JSONObject secrets, JSONObject gateway, int apiVersion) {
+        this.generalConfiguration = generalConfiguration;
         this.gateway = gateway;
         this.secrets = secrets;
+        this.apiVersion = apiVersion;
+        checkCapabilities();
     }
 
-    public String generate() {
-        return
-                generalConfiguration()
+    public void checkCapabilities() {
+
+        try {
+            switch (apiVersion) {
+                case 2:
+                    JSONArray supportedTransports = gateway.getJSONObject(CAPABILITIES).getJSONArray(TRANSPORT);
+                    for (int i = 0; i < supportedTransports.length(); i++) {
+                        JSONObject transport = supportedTransports.getJSONObject(i);
+                        if (transport.getString(TYPE).equals("obfs4")) {
+                            obfs4Transport = transport;
+                        }
+                    }
+                    break;
+                default:
+                    break;
+            }
+
+        } catch (JSONException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public VpnProfile generateVpnProfile() throws IllegalStateException,
+            IOException,
+            ConfigParser.ConfigParseError,
+            CloneNotSupportedException,
+            JSONException,
+            NumberFormatException {
+
+        VpnProfile profile = createOvpnProfile();
+        if (supportsObfs4()) {
+            addPluggableTransportConnections(profile);
+        }
+        return profile;
+    }
+
+    private boolean supportsObfs4(){
+        return obfs4Transport != null;
+    }
+
+    private void addPluggableTransportConnections(VpnProfile profile) throws JSONException, CloneNotSupportedException {
+        JSONArray ports = obfs4Transport.getJSONArray(PORTS);
+        Connection[] updatedConnections = new Connection[profile.mConnections.length + ports.length()];
+
+        for (int i = 0; i < ports.length(); i++) {
+            String port = ports.getString(i);
+            Obfs4Connection obfs4Connection = new Obfs4Connection();
+            obfs4Connection.setObfs4RemoteProxyName(gateway.getString(IP_ADDRESS));
+            obfs4Connection.setObfs4RemoteProxyPort(port);
+            obfs4Connection.setTransportOptions(obfs4Transport.optJSONObject(OPTIONS));
+            updatedConnections[i] = obfs4Connection;
+        }
+        int k = 0;
+        for (int i = ports.length(); i < updatedConnections.length; i++, k++) {
+            updatedConnections[i] = profile.mConnections[k].clone();
+        }
+        profile.mConnections = updatedConnections;
+    }
+
+    private String getConfigurationString() {
+        return generalConfiguration()
                         + newLine
-                        + gatewayConfiguration()
+                        + ovpnGatewayConfiguration()
                         + newLine
                         + secretsConfiguration()
                         + newLine
                         + androidCustomizations();
     }
 
+    private VpnProfile createOvpnProfile() throws IOException, ConfigParser.ConfigParseError {
+        String configuration = getConfigurationString();
+        icsOpenvpnConfigParser.parseConfig(new StringReader(configuration));
+        return icsOpenvpnConfigParser.convertProfile();
+    }
+
     private String generalConfiguration() {
         String commonOptions = "";
         try {
-            Iterator keys = general_configuration.keys();
+            Iterator keys = generalConfiguration.keys();
             while (keys.hasNext()) {
                 String key = keys.next().toString();
 
                 commonOptions += key + " ";
-                for (String word : String.valueOf(general_configuration.get(key)).split(" "))
+                for (String word : String.valueOf(generalConfiguration.get(key)).split(" "))
                     commonOptions += word + " ";
                 commonOptions += newLine;
 
@@ -76,41 +161,73 @@ public class VpnConfigGenerator {
         return commonOptions;
     }
 
-    private String gatewayConfiguration() {
+    private String ovpnGatewayConfiguration() {
         String remotes = "";
 
-        String ipAddressKeyword = "ip_address";
-        String remoteKeyword = "remote";
-        String portsKeyword = "ports";
-        String protocolKeyword = "protocols";
-        String capabilitiesKeyword = "capabilities";
-
+        StringBuilder stringBuilder = new StringBuilder();
         try {
-            String ip_address = gateway.getString(ipAddressKeyword);
-            JSONObject capabilities = gateway.getJSONObject(capabilitiesKeyword);
-            JSONArray ports = capabilities.getJSONArray(portsKeyword);
-            for (int i = 0; i < ports.length(); i++) {
-                String port_specific_remotes = "";
-                int port = ports.getInt(i);
-                JSONArray protocols = capabilities.getJSONArray(protocolKeyword);
-                for (int j = 0; j < protocols.length(); j++) {
-                    String protocol = protocols.optString(j);
-                    String new_remote = remoteKeyword + " " + ip_address + " " + port + " " + protocol + newLine;
-
-                    port_specific_remotes += new_remote;
-                }
-                remotes += port_specific_remotes;
+            String ipAddress = gateway.getString(IP_ADDRESS);
+            JSONObject capabilities = gateway.getJSONObject(CAPABILITIES);
+            JSONArray transports = capabilities.getJSONArray(TRANSPORT);
+            switch (apiVersion) {
+                default:
+                case 1:
+                    ovpnGatewayConfigApiv1(stringBuilder, ipAddress, capabilities);
+                    break;
+                case 2:
+                    ovpnGatewayConfigApiv2(stringBuilder, ipAddress, transports);
+                    break;
             }
         } catch (JSONException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
+
+        remotes = stringBuilder.toString();
         if (remotes.endsWith(newLine)) {
             remotes = remotes.substring(0, remotes.lastIndexOf(newLine));
         }
         return remotes;
     }
 
+    private void ovpnGatewayConfigApiv1(StringBuilder stringBuilder, String ipAddress, JSONObject capabilities) throws JSONException {
+        int port;
+        String protocol;
+
+        JSONArray ports = capabilities.getJSONArray(PORTS);
+        for (int i = 0; i < ports.length(); i++) {
+            port = ports.getInt(i);
+            JSONArray protocols = capabilities.getJSONArray(PROTOCOLS);
+            for (int j = 0; j < protocols.length(); j++) {
+                protocol = protocols.optString(j);
+                String newRemote = REMOTE + " " + ipAddress + " " + port + " " + protocol + newLine;
+                stringBuilder.append(newRemote);
+            }
+        }
+    }
+
+    private void ovpnGatewayConfigApiv2(StringBuilder stringBuilder, String ipAddress, JSONArray transports) throws JSONException {
+        String port;
+        String protocol;
+        for (int i = 0; i < transports.length(); i++) {
+            JSONObject transport = transports.getJSONObject(i);
+            if (!transport.getString(TYPE).equals("openvpn")) {
+                continue;
+            }
+            JSONArray ports = transport.getJSONArray(PORTS);
+            for (int j = 0; j < ports.length(); j++) {
+                port = ports.getString(j);
+                JSONArray protocols = transport.getJSONArray(PROTOCOLS);
+                for (int k = 0; k < protocols.length(); k++) {
+                    protocol = protocols.optString(k);
+                    String newRemote = REMOTE + " " + ipAddress + " " + port + " " + protocol + newLine;
+                    stringBuilder.append(newRemote);
+                }
+            }
+        }
+    }
+
+
     private String secretsConfiguration() {
         try {
             String ca =
diff --git a/app/src/main/java/se/leap/bitmaskclient/pluggableTransports/BinaryInstaller.java b/app/src/main/java/se/leap/bitmaskclient/pluggableTransports/BinaryInstaller.java
new file mode 100644
index 00000000..0d6aa61e
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/pluggableTransports/BinaryInstaller.java
@@ -0,0 +1,204 @@
+/* Copyright (c) 2009, Nathan Freitas, Orbot / The Guardian Project - http://openideals.com/guardian */
+/* See LICENSE for licensing information */
+
+package se.leap.bitmaskclient.pluggableTransports;
+
+import android.content.Context;
+import android.util.Log;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.concurrent.TimeoutException;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+
+public class BinaryInstaller {
+
+    File installFolder;
+    Context context;
+
+    public BinaryInstaller(Context context, File installFolder)
+    {
+        this.installFolder = installFolder;
+
+        this.context = context;
+    }
+
+    public void deleteDirectory(File file) {
+        if( file.exists() ) {
+            if (file.isDirectory()) {
+                File[] files = file.listFiles();
+                for(int i=0; i<files.length; i++) {
+                    if(files[i].isDirectory()) {
+                        deleteDirectory(files[i]);
+                    }
+                    else {
+                        files[i].delete();
+                    }
+                }
+            }
+
+            file.delete();
+        }
+    }
+
+    private final static String COMMAND_RM_FORCE = "rm -f ";
+    private final static String MP3_EXT = ".mp3";
+    //        
+    /*
+     * Extract the resources from the APK file using ZIP
+     */
+    public File installResource (String basePath, String assetKey, boolean overwrite) throws IOException, FileNotFoundException, TimeoutException
+    {
+
+        InputStream is;
+        File outFile;
+
+        outFile = new File(installFolder, assetKey);
+
+        if (outFile.exists() && (!overwrite)) {
+            Log.d("BINARY_INSTALLER", "Binary already exists! Using " + outFile.getCanonicalPath());
+            return outFile;
+        }
+
+        deleteDirectory(installFolder);
+        installFolder.mkdirs();
+
+        Log.d("BINARY_INSTALLER", "Search asset in " + basePath + "/" + assetKey);
+
+        is = context.getAssets().open(basePath + '/' + assetKey);
+        streamToFile(is,outFile, false, false);
+        setExecutable(outFile);
+
+        Log.d("BINARY_INSTALLER", "Asset copied from " + basePath + "/" + assetKey + " to: " + outFile.getCanonicalPath());
+
+        return outFile;
+    }
+
+
+    private final static int FILE_WRITE_BUFFER_SIZE = 1024*8;
+    /*
+     * Write the inputstream contents to the file
+     */
+    public static boolean streamToFile(InputStream stm, File outFile, boolean append, boolean zip) throws IOException
+
+    {
+        byte[] buffer = new byte[FILE_WRITE_BUFFER_SIZE];
+
+        int bytecount;
+
+        OutputStream stmOut = new FileOutputStream(outFile.getAbsolutePath(), append);
+        ZipInputStream zis = null;
+
+        if (zip)
+        {
+            zis = new ZipInputStream(stm);
+            ZipEntry ze = zis.getNextEntry();
+            stm = zis;
+
+        }
+
+        while ((bytecount = stm.read(buffer)) > 0)
+        {
+
+            stmOut.write(buffer, 0, bytecount);
+
+        }
+
+        stmOut.close();
+        stm.close();
+
+        if (zis != null)
+            zis.close();
+
+
+        return true;
+
+    }
+
+    //copy the file from inputstream to File output - alternative impl
+    public static boolean copyFile (InputStream is, File outputFile)
+    {
+
+        try {
+            if (outputFile.exists())
+                outputFile.delete();
+
+            boolean newFile = outputFile.createNewFile();
+            DataOutputStream out = new DataOutputStream(new FileOutputStream(outputFile));
+            DataInputStream in = new DataInputStream(is);
+
+            int b = -1;
+            byte[] data = new byte[1024];
+
+            while ((b = in.read(data)) != -1) {
+                out.write(data);
+            }
+
+            if (b == -1); //rejoice
+
+            //
+            out.flush();
+            out.close();
+            in.close();
+            // chmod?
+
+            return newFile;
+
+
+        } catch (IOException ex) {
+            Log.e("Binaryinstaller", "error copying binary", ex);
+            return false;
+        }
+
+    }
+
+    /**
+     * Copies a raw resource file, given its ID to the given location
+     * @param ctx context
+     * @param resid resource id
+     * @param file destination file
+     * @param mode file permissions (E.g.: "755")
+     * @throws IOException on error
+     * @throws InterruptedException when interrupted
+     */
+    public static void copyRawFile(Context ctx, int resid, File file, String mode, boolean isZipd) throws IOException, InterruptedException
+    {
+        final String abspath = file.getAbsolutePath();
+        // Write the iptables binary
+        final FileOutputStream out = new FileOutputStream(file);
+        InputStream is = ctx.getResources().openRawResource(resid);
+
+        if (isZipd)
+        {
+            ZipInputStream zis = new ZipInputStream(is);
+            ZipEntry ze = zis.getNextEntry();
+            is = zis;
+        }
+
+        byte buf[] = new byte[1024];
+        int len;
+        while ((len = is.read(buf)) > 0) {
+            out.write(buf, 0, len);
+        }
+        out.close();
+        is.close();
+        // Change the permissions
+        Runtime.getRuntime().exec("chmod "+mode+" "+abspath).waitFor();
+    }
+
+
+    private void setExecutable(File fileBin) {
+        fileBin.setReadable(true);
+        fileBin.setExecutable(true);
+        fileBin.setWritable(false);
+        fileBin.setWritable(true, true);
+    }
+
+}
diff --git a/app/src/main/java/se/leap/bitmaskclient/pluggableTransports/Dispatcher.java b/app/src/main/java/se/leap/bitmaskclient/pluggableTransports/Dispatcher.java
new file mode 100644
index 00000000..ac846fd9
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/pluggableTransports/Dispatcher.java
@@ -0,0 +1,229 @@
+/**
+ * Copyright (c) 2019 LEAP Encryption Access Project and contributers
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package se.leap.bitmaskclient.pluggableTransports;
+
+import android.content.Context;
+import android.support.annotation.WorkerThread;
+import android.util.Log;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.StringTokenizer;
+
+
+/**
+ * Created by cyberta on 22.02.19.
+ */
+
+public class Dispatcher {
+    private static final String ASSET_KEY = "piedispatcher";
+    private static final String TAG = Dispatcher.class.getName();
+    private final String remoteIP;
+    private final String remotePort;
+    private final String certificate;
+    private final String iatMode;
+    private File fileDispatcher;
+    private Context context;
+    private String port = "";
+    private Thread dispatcherThread = null;
+    private int dipatcherPid = -1;
+
+    public Dispatcher(Context context, String remoteIP, String remotePort, String certificate, String iatMode) {
+        this.context = context.getApplicationContext();
+        this.remoteIP = remoteIP;
+        this.remotePort = remotePort;
+        this.certificate = certificate;
+        this.iatMode = iatMode;
+    }
+
+    @WorkerThread
+    public void initSync() {
+        try {
+            fileDispatcher = installDispatcher();
+
+            // start dispatcher
+            dispatcherThread = new Thread(() -> {
+                try {
+                    StringBuilder dispatcherLog = new StringBuilder();
+                    String dispatcherCommand = fileDispatcher.getCanonicalPath() +
+                            " -transparent" +
+                            " -client" +
+                            " -state " + context.getFilesDir().getCanonicalPath() + "/state" +
+                            " -target " + remoteIP + ":" + remotePort +
+                            " -transports obfs4" +
+                            " -options \"" + String.format("{\\\"cert\\\": \\\"%s\\\", \\\"iatMode\\\": \\\"%s\\\"}\"", certificate, iatMode) +
+                            " -logLevel DEBUG -enableLogging";
+
+                    runBlockingCmd(new String[]{dispatcherCommand}, dispatcherLog);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            });
+            dispatcherThread.start();
+
+            // get pid of dispatcher
+            StringBuilder log = new StringBuilder();
+            String pidCommand = "ps | grep " + fileDispatcher.getCanonicalPath();
+            runBlockingCmd(new String[]{pidCommand}, log);
+            String output  = log.toString();
+            StringTokenizer st = new StringTokenizer(output, " ");
+            st.nextToken(); // proc owner
+            dipatcherPid = Integer.parseInt(st.nextToken().trim());
+
+            // get open port of dispatcher
+            String getPortCommand = "cat " + context.getFilesDir().getCanonicalPath() + "/state/dispatcher.log | grep \"obfs4 - registered listener\"";
+            long timeout = System.currentTimeMillis() + 5000;
+            int i = 1;
+            while (this.port.length() == 0 && System.currentTimeMillis() < timeout) {
+                log = new StringBuilder();
+                Log.d(TAG, i + ". try to get port");
+                runBlockingCmd(new String[]{getPortCommand}, log);
+                output = log.toString();
+                if (output.length() > 0) {
+                    Log.d(TAG, "dispatcher log: \n =================\n" + output);
+                }
+
+                String dispatcherLog[] = output.split(" ");
+                if (dispatcherLog.length > 0) {
+                    String localAddressAndPort = dispatcherLog[dispatcherLog.length - 1];
+                    if (localAddressAndPort.contains(":")) {
+                        this.port = localAddressAndPort.split(":")[1].replace(System.getProperty("line.separator"), "");
+                        Log.d(TAG, "local port is: " + this.port);
+                    }
+                }
+                i += 1;
+            }
+
+        } catch(Exception e){
+            if (dispatcherThread.isAlive()) {
+                Log.e(TAG, e.getMessage() + ". Shutting down Dispatcher thread.");
+                stop();
+            }
+        }
+    }
+
+    public String getPort() {
+        return port;
+    }
+
+    public void stop() {
+        Log.d(TAG, "Shutting down Dispatcher thread.");
+        if (dispatcherThread != null && dispatcherThread.isAlive()) {
+            try {
+                killProcess(dipatcherPid);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+            dispatcherThread.interrupt();
+        }
+    }
+
+    private void killProcess(int pid) throws Exception {
+        String killPid = "kill -9 " + pid;
+        runCmd(new String[]{killPid}, null, false);
+    }
+
+    public boolean isRunning() {
+        return dispatcherThread != null && dispatcherThread.isAlive();
+    }
+
+    private File installDispatcher(){
+        File fileDispatcher = null;
+        BinaryInstaller bi = new BinaryInstaller(context,context.getFilesDir());
+
+        String arch = System.getProperty("os.arch");
+        if (arch.contains("arm"))
+            arch = "arm";
+        else
+            arch = "x86";
+
+        try {
+            fileDispatcher = bi.installResource(arch, ASSET_KEY, false);
+        } catch (Exception ioe) {
+            Log.d(TAG,"Couldn't install dispatcher: " + ioe);
+        }
+
+        return fileDispatcher;
+    }
+
+    @WorkerThread
+    private void runBlockingCmd(String[] cmds, StringBuilder log) throws Exception {
+        runCmd(cmds, log, true);
+    }
+
+    @WorkerThread
+    private int runCmd(String[] cmds, StringBuilder log,
+                       boolean waitFor) throws Exception {
+
+        int exitCode = -1;
+        Process proc = Runtime.getRuntime().exec("sh");
+        OutputStreamWriter out = new OutputStreamWriter(proc.getOutputStream());
+
+        try {
+            for (String cmd : cmds) {
+                Log.d(TAG, "executing CMD: " + cmd);
+                out.write(cmd);
+                out.write("\n");
+            }
+
+            out.flush();
+            out.write("exit\n");
+            out.flush();
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            out.close();
+        }
+
+        if (waitFor) {
+            // Consume the "stdout"
+            InputStreamReader reader = new InputStreamReader(proc.getInputStream());
+            readToLogString(reader, log);
+
+            // Consume the "stderr"
+            reader = new InputStreamReader(proc.getErrorStream());
+            readToLogString(reader, log);
+
+            try {
+                exitCode = proc.waitFor();
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+
+        return exitCode;
+    }
+
+    private void readToLogString(InputStreamReader reader, StringBuilder log) throws IOException {
+        final char buf[] = new char[10];
+        int read = 0;
+        try {
+            while ((read = reader.read(buf)) != -1) {
+                if (log != null)
+                    log.append(buf, 0, read);
+            }
+        } catch (IOException e) {
+            reader.close();
+            throw new IOException(e);
+        }
+        reader.close();
+    }
+}