don't handle obfs4 over kcp as a separate pluggable transport, instead 'tcp' and 'kcp' become valid protocols for obfs4

7 files changed, 85 insertions, 77 deletions

diff --git a/app/src/main/java/de/blinkt/openvpn/VpnProfile.java b/app/src/main/java/de/blinkt/openvpn/VpnProfile.java
index 83cde85e..3428e0c4 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 static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4;
+import static de.blinkt.openvpn.core.connection.Connection.TransportType.OPENVPN;
+import static se.leap.bitmaskclient.base.models.Constants.PROVIDER_PROFILE;
+import static se.leap.bitmaskclient.base.utils.ConfigHelper.stringEqual;
+
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.Intent;
@@ -34,8 +39,6 @@ import java.io.FileWriter;
 import java.io.IOException;
 import java.io.Serializable;
 import java.io.StringWriter;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
 import java.security.PrivateKey;
@@ -69,12 +72,6 @@ import de.blinkt.openvpn.core.connection.ConnectionAdapter;
 import se.leap.bitmaskclient.BuildConfig;
 import se.leap.bitmaskclient.R;
 
-import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4;
-import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4_KCP;
-import static de.blinkt.openvpn.core.connection.Connection.TransportType.OPENVPN;
-import static se.leap.bitmaskclient.base.models.Constants.PROVIDER_PROFILE;
-import static se.leap.bitmaskclient.base.utils.ConfigHelper.stringEqual;
-
 public class VpnProfile implements Serializable, Cloneable {
     // Note that this class cannot be moved to core where it belongs since
     // the profile loading depends on it being here
@@ -184,6 +181,7 @@ public class VpnProfile implements Serializable, Cloneable {
     /* Options no longer used in new profiles */
     public String mServerName = "openvpn.example.com";
     public String mServerPort = "1194";
+    @Deprecated
     public boolean mUseUdp = true;
     public boolean mTemporaryProfile = false;
     private transient PrivateKey mPrivateKey;
@@ -193,8 +191,7 @@ public class VpnProfile implements Serializable, Cloneable {
     private int mProfileVersion;
     public boolean mBlockUnusedAddressFamilies = true;
     public String mGatewayIp;
-    private boolean mUseObfs4;
-    private boolean mUseObfs4Kcp;
+    private final boolean mUseObfs4;
 
     public VpnProfile(String name, Connection.TransportType transportType) {
         mUuid = UUID.randomUUID();
@@ -204,7 +201,6 @@ public class VpnProfile implements Serializable, Cloneable {
         mConnections = new Connection[1];
         mLastUsed = System.currentTimeMillis();
         mUseObfs4 = transportType == OBFS4;
-        mUseObfs4Kcp = transportType == OBFS4_KCP;
     }
 
     public static String openVpnEscape(String unescaped) {
@@ -270,8 +266,7 @@ public class VpnProfile implements Serializable, Cloneable {
         if (obj instanceof VpnProfile) {
             VpnProfile vp = (VpnProfile) obj;
             return stringEqual(vp.mGatewayIp, mGatewayIp) &&
-                    vp.mUseObfs4 == mUseObfs4 &&
-                    vp.mUseObfs4Kcp == mUseObfs4Kcp;
+                    vp.mUseObfs4 == mUseObfs4;
         }
         return false;
     }
@@ -302,14 +297,12 @@ public class VpnProfile implements Serializable, Cloneable {
     }
 
     public boolean usePluggableTransports() {
-        return mUseObfs4Kcp || mUseObfs4;
+        return mUseObfs4;
     }
 
     public Connection.TransportType getTransportType() {
         if (mUseObfs4) {
             return OBFS4;
-        } else if (mUseObfs4Kcp) {
-            return OBFS4_KCP;
         } else {
             return OPENVPN;
         }
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
index f60e7333..137b3f16 100644
--- a/app/src/main/java/de/blinkt/openvpn/core/connection/Connection.java
+++ b/app/src/main/java/de/blinkt/openvpn/core/connection/Connection.java
@@ -37,10 +37,25 @@ public abstract class Connection implements Serializable, Cloneable {
         ORBOT
     }
 
+    public enum TransportProtocol {
+        UDP("udp"),
+        TCP("tcp"),
+        KCP("kcp");
+
+        String protocol;
+
+        TransportProtocol(String transportProtocol) {
+            this.protocol = transportProtocol;
+        }
+
+        @Override
+        public String toString() {
+            return protocol;
+        }
+    }
     public enum TransportType {
         OBFS4("obfs4"),
         OPENVPN("openvpn"),
-        OBFS4_KCP("obfs4-1"),
 
         PT("metaTransport");
 
@@ -56,11 +71,11 @@ public abstract class Connection implements Serializable, Cloneable {
         }
 
         public boolean isPluggableTransport() {
-            return this == OBFS4 || this == OBFS4_KCP || this == PT;
+            return this == OBFS4 || this == PT;
         }
 
         public TransportType getMetaType() {
-            if (this == OBFS4 || this == OBFS4_KCP || this == PT) {
+            if (this == OBFS4 || this == PT) {
                 return PT;
             }
             return OPENVPN;
diff --git a/app/src/main/java/se/leap/bitmaskclient/base/models/Provider.java b/app/src/main/java/se/leap/bitmaskclient/base/models/Provider.java
index 53f864cf..62fb1fd2 100644
--- a/app/src/main/java/se/leap/bitmaskclient/base/models/Provider.java
+++ b/app/src/main/java/se/leap/bitmaskclient/base/models/Provider.java
@@ -16,11 +16,13 @@
  */
 package se.leap.bitmaskclient.base.models;
 
+import static de.blinkt.openvpn.core.connection.Connection.TransportProtocol.KCP;
+import static de.blinkt.openvpn.core.connection.Connection.TransportProtocol.TCP;
 import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4;
-import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4_KCP;
 import static se.leap.bitmaskclient.base.models.Constants.CAPABILITIES;
 import static se.leap.bitmaskclient.base.models.Constants.GATEWAYS;
 import static se.leap.bitmaskclient.base.models.Constants.LOCATIONS;
+import static se.leap.bitmaskclient.base.models.Constants.PROTOCOLS;
 import static se.leap.bitmaskclient.base.models.Constants.PROVIDER_ALLOWED_REGISTERED;
 import static se.leap.bitmaskclient.base.models.Constants.PROVIDER_ALLOW_ANONYMOUS;
 import static se.leap.bitmaskclient.base.models.Constants.TRANSPORT;
@@ -46,6 +48,7 @@ import java.util.HashSet;
 import java.util.Locale;
 import java.util.Set;
 
+import de.blinkt.openvpn.core.connection.Connection.TransportProtocol;
 import de.blinkt.openvpn.core.connection.Connection.TransportType;
 import motd.IStringCollection;
 import motd.Motd;
@@ -181,16 +184,16 @@ public final class Provider implements Parcelable {
 
     public boolean supportsPluggableTransports() {
         if (useObfsVpn()) {
-            return supportsTransports(new TransportType[]{OBFS4, OBFS4_KCP});
+            return supportsTransports(new Pair[]{new Pair<>(OBFS4, TCP), new Pair<>(OBFS4, KCP)});
         }
-        return supportsTransports(new TransportType[]{OBFS4});
+        return supportsTransports(new Pair[]{new Pair<>(OBFS4, TCP)});
     }
 
     public boolean supportsExperimentalPluggableTransports() {
-        return supportsTransports(new TransportType[]{OBFS4_KCP});
+        return supportsTransports(new Pair[]{new Pair<>(OBFS4, KCP)});
     }
 
-    private boolean supportsTransports(TransportType[] transportTypes) {
+    private boolean supportsTransports(Pair<TransportType, TransportProtocol>[] transportTypes) {
         try {
             JSONArray gatewayJsons = eipServiceJson.getJSONArray(GATEWAYS);
             for (int i = 0; i < gatewayJsons.length(); i++) {
@@ -199,9 +202,13 @@ public final class Provider implements Parcelable {
                         getJSONArray(TRANSPORT);
                 for (int j = 0; j < transports.length(); j++) {
                     String supportedTransportType = transports.getJSONObject(j).getString(TYPE);
-                    for (TransportType transportType : transportTypes) {
-                        if (transportType.toString().equals(supportedTransportType)) {
-                            return true;
+                    JSONArray transportProtocols = transports.getJSONObject(j).getJSONArray(PROTOCOLS);
+                    for (Pair<TransportType, TransportProtocol> transportPair : transportTypes) {
+                        for (int k = 0; k < transportProtocols.length(); k++) {
+                            if (transportPair.first.toString().equals(supportedTransportType) &&
+                                transportPair.second.toString().equals(transportProtocols.getString(k))) {
+                                return true;
+                            }
                         }
                     }
                 }
diff --git a/app/src/main/java/se/leap/bitmaskclient/eip/EIP.java b/app/src/main/java/se/leap/bitmaskclient/eip/EIP.java
index 88cdc715..5b082448 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/EIP.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/EIP.java
@@ -91,6 +91,7 @@ import se.leap.bitmaskclient.base.models.Provider;
 import se.leap.bitmaskclient.base.models.Pair;
 import se.leap.bitmaskclient.base.models.ProviderObservable;
 import se.leap.bitmaskclient.base.utils.PreferenceHelper;
+import se.leap.bitmaskclient.eip.GatewaysManager.GatewayOptions;
 
 /**
  * EIP is the abstract base class for interacting with and managing the Encrypted
@@ -255,8 +256,8 @@ public final class EIP extends JobIntentService implements Observer {
             return;
         }
 
-        Pair<Gateway, Connection.TransportType> gatewayTransportTypePair = gatewaysManager.select(nClosestGateway);
-        launchActiveGateway(gatewayTransportTypePair, nClosestGateway, result);
+        GatewayOptions gatewayOptions = gatewaysManager.select(nClosestGateway);
+        launchActiveGateway(gatewayOptions, nClosestGateway, result);
         if (result.containsKey(BROADCAST_RESULT_KEY) && !result.getBoolean(BROADCAST_RESULT_KEY)) {
             tellToReceiverOrBroadcast(this, EIP_ACTION_START, RESULT_CANCELED, result);
         } else {
@@ -270,7 +271,7 @@ public final class EIP extends JobIntentService implements Observer {
      */
     private void startEIPAlwaysOnVpn() {
         GatewaysManager gatewaysManager = new GatewaysManager(getApplicationContext());
-        Pair<Gateway, Connection.TransportType> gatewayTransportTypePair = gatewaysManager.select(0);
+        GatewayOptions gatewayOptions = gatewaysManager.select(0);
         Bundle result = new Bundle();
 
         if (shouldUpdateVPNCertificate()) {
@@ -279,7 +280,7 @@ public final class EIP extends JobIntentService implements Observer {
             ProviderObservable.getInstance().updateProvider(p);
         }
 
-        launchActiveGateway(gatewayTransportTypePair, 0, result);
+        launchActiveGateway(gatewayOptions, 0, result);
         if (result.containsKey(BROADCAST_RESULT_KEY) && !result.getBoolean(BROADCAST_RESULT_KEY)){
             VpnStatus.logWarning("ALWAYS-ON VPN: " + getString(R.string.no_vpn_profiles_defined));
         }
@@ -323,13 +324,13 @@ public final class EIP extends JobIntentService implements Observer {
     /**
      * starts the VPN and connects to the given gateway
      *
-     * @param gatewayTransportTypePair Pair of Gateway and associated transport used to connect
+     * @param gatewayOptions GatewayOptions model containing a Gateway and the associated transport used to connect
      */
-    private void launchActiveGateway(@Nullable Pair<Gateway, Connection.TransportType> gatewayTransportTypePair, int nClosestGateway, Bundle result) {
+    private void launchActiveGateway(@Nullable GatewayOptions gatewayOptions, int nClosestGateway, Bundle result) {
         VpnProfile profile;
 
-        if (gatewayTransportTypePair == null || gatewayTransportTypePair.first == null ||
-                (profile = gatewayTransportTypePair.first.getProfile(gatewayTransportTypePair.second)) == null) {
+        if (gatewayOptions == null || gatewayOptions.gateway == null ||
+                (profile = gatewayOptions.gateway.getProfile(gatewayOptions.transportType)) == null) {
             String preferredLocation = getPreferredCity(getApplicationContext());
             if (preferredLocation != null) {
                 setErrorResult(result, NO_MORE_GATEWAYS.toString(), getStringResourceForNoMoreGateways(), getString(R.string.app_name), preferredLocation);
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 929935eb..719b960e 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/Gateway.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/Gateway.java
@@ -16,6 +16,7 @@
  */
 package se.leap.bitmaskclient.eip;
 
+import static de.blinkt.openvpn.core.connection.Connection.TransportType.PT;
 import static se.leap.bitmaskclient.base.models.Constants.FULLNESS;
 import static se.leap.bitmaskclient.base.models.Constants.HOST;
 import static se.leap.bitmaskclient.base.models.Constants.IP_ADDRESS;
@@ -52,7 +53,6 @@ import java.util.HashSet;
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.ConfigParser;
 import de.blinkt.openvpn.core.connection.Connection;
-import se.leap.bitmaskclient.R;
 import se.leap.bitmaskclient.base.utils.ConfigHelper;
 
 /**
@@ -77,6 +77,9 @@ public class Gateway {
     private String name;
     private int timezone;
     private int apiVersion;
+    /** FIXME: We expect here that not more than one obfs4 transport is offered by a gateway, however
+     * it's possible to setup gateways that have obfs4 over kcp and tcp which result in different VpnProfiles each
+     */
     private HashMap<Connection.TransportType, VpnProfile> vpnProfiles;
 
     /**
@@ -209,7 +212,7 @@ public class Gateway {
     }
 
     public boolean supportsTransport(Connection.TransportType transportType) {
-        if (transportType == Connection.TransportType.PT) {
+        if (transportType == PT) {
             return supportsPluggableTransports();
         }
         return vpnProfiles.get(transportType) != 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 521d095e..28766998 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/GatewaysManager.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/GatewaysManager.java
@@ -17,7 +17,6 @@
 package se.leap.bitmaskclient.eip;
 
 import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4;
-import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4_KCP;
 import static de.blinkt.openvpn.core.connection.Connection.TransportType.OPENVPN;
 import static de.blinkt.openvpn.core.connection.Connection.TransportType.PT;
 import static se.leap.bitmaskclient.base.models.Constants.GATEWAYS;
@@ -61,7 +60,6 @@ import se.leap.bitmaskclient.BuildConfig;
 import se.leap.bitmaskclient.R;
 import se.leap.bitmaskclient.base.models.GatewayJson;
 import se.leap.bitmaskclient.base.models.Location;
-import se.leap.bitmaskclient.base.models.Pair;
 import se.leap.bitmaskclient.base.models.Provider;
 import se.leap.bitmaskclient.base.models.ProviderObservable;
 import se.leap.bitmaskclient.base.models.Transport;
@@ -103,6 +101,16 @@ public class GatewaysManager {
         }
     }
 
+    public static class GatewayOptions {
+        public Gateway gateway;
+        public TransportType transportType;
+
+        public GatewayOptions(Gateway gateway, TransportType transportType) {
+            this.gateway = gateway;
+            this.transportType = transportType;
+        }
+    }
+
     private static final String TAG = GatewaysManager.class.getSimpleName();
     public static final String PINNED_OBFUSCATION_PROXY = "pinned.obfuscation.proxy";
 
@@ -122,7 +130,7 @@ public class GatewaysManager {
      * select closest Gateway
       * @return the n closest Gateway
      */
-    public Pair<Gateway, TransportType> select(int nClosest) {
+    public GatewayOptions select(int nClosest) {
         if (PreferenceHelper.useObfuscationPinning(context)) {
             if (nClosest > 2) {
                 // no need to try again the pinned proxy, probably configuration error
@@ -132,14 +140,14 @@ public class GatewaysManager {
             if (gateway == null) {
                 return null;
             }
-            return new Pair<>(gateway, getObfuscationPinningKCP(context) ? OBFS4_KCP : OBFS4);
+            return new GatewayOptions(gateway, OBFS4);
         }
         String selectedCity = getPreferredCity(context);
         return select(nClosest, selectedCity);
     }
 
-    public Pair<Gateway, TransportType> select(int nClosest, String city) {
-        TransportType[] transportTypes = getUseBridges(context) ? new TransportType[]{OBFS4, OBFS4_KCP} : new TransportType[]{OPENVPN};
+    public GatewayOptions select(int nClosest, String city) {
+        TransportType[] transportTypes = getUseBridges(context) ? new TransportType[]{OBFS4} : new TransportType[]{OPENVPN};
         if (presortedList.size() > 0) {
             return getGatewayFromPresortedList(nClosest, transportTypes, city);
         }
@@ -266,7 +274,7 @@ public class GatewaysManager {
         return Load.getLoadByValue(location.getAverageLoad(transportType));
     }
 
-    private Pair<Gateway, TransportType> getGatewayFromTimezoneCalculation(int nClosest, TransportType[] transportTypes, @Nullable String city) {
+    private GatewayOptions getGatewayFromTimezoneCalculation(int nClosest, TransportType[] transportTypes, @Nullable String city) {
         List<Gateway> list = new ArrayList<>(gateways.values());
         GatewaySelector gatewaySelector = new GatewaySelector(list);
         Gateway gateway;
@@ -277,7 +285,7 @@ public class GatewaysManager {
                 if ((city == null && gateway.supportsTransport(transportType)) ||
                         (gateway.getName().equals(city) && gateway.supportsTransport(transportType))) {
                     if (found == nClosest) {
-                        return new Pair<>(gateway, transportType);
+                        return new GatewayOptions(gateway, transportType);
                     }
                     found++;
                 }
@@ -287,14 +295,14 @@ public class GatewaysManager {
         return null;
     }
 
-    private Pair<Gateway, TransportType> getGatewayFromPresortedList(int nClosest, TransportType[] transportTypes, @Nullable String city) {
+    private GatewayOptions getGatewayFromPresortedList(int nClosest, TransportType[] transportTypes, @Nullable String city) {
         int found = 0;
         for (Gateway gateway : presortedList) {
             for (TransportType transportType : transportTypes) {
                 if ((city == null && gateway.supportsTransport(transportType)) ||
                         (gateway.getName().equals(city) && gateway.supportsTransport(transportType))) {
                     if (found == nClosest) {
-                        return new Pair<>(gateway, transportType);
+                        return new GatewayOptions(gateway, transportType);
                     }
                     found++;
                 }
@@ -387,10 +395,9 @@ public class GatewaysManager {
 
              if (PreferenceHelper.useObfuscationPinning(context)) {
                  try {
-                     TransportType transportType = getObfuscationPinningKCP(context) ? OBFS4_KCP : OBFS4;
                      Transport[] transports = new Transport[]{
-                             new Transport(transportType.toString(),
-                                     new String[]{"tcp"},
+                             new Transport(OBFS4.toString(),
+                                     new String[]{getObfuscationPinningKCP(context) ? "kcp" : "tcp"},
                                      new String[]{getObfuscationPinningPort(context)},
                                      getObfuscationPinningCert(context))};
                      GatewayJson.Capabilities capabilities = new GatewayJson.Capabilities(false, false, false, transports, 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 72a0d80a..141f6274 100644
--- a/app/src/main/java/se/leap/bitmaskclient/eip/VpnConfigGenerator.java
+++ b/app/src/main/java/se/leap/bitmaskclient/eip/VpnConfigGenerator.java
@@ -17,7 +17,6 @@
 package se.leap.bitmaskclient.eip;
 
 import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4;
-import static de.blinkt.openvpn.core.connection.Connection.TransportType.OBFS4_KCP;
 import static de.blinkt.openvpn.core.connection.Connection.TransportType.OPENVPN;
 import static de.blinkt.openvpn.core.connection.Connection.TransportType.PT;
 import static se.leap.bitmaskclient.base.models.Constants.CAPABILITIES;
@@ -63,7 +62,6 @@ public class VpnConfigGenerator {
     private final JSONObject gateway;
     private final JSONObject secrets;
     private JSONObject obfs4Transport;
-    private JSONObject obfs4TKcpTransport;
     private final int apiVersion;
     private final boolean preferUDP;
     private final boolean experimentalTransports;
@@ -122,11 +120,7 @@ public class VpnConfigGenerator {
                     JSONObject transport = supportedTransports.getJSONObject(i);
                     if (transport.getString(TYPE).equals(OBFS4.toString())) {
                         obfs4Transport = transport;
-                        if (!experimentalTransports && !obfuscationPinningKCP) {
-                            break;
-                        }
-                    } else if ((experimentalTransports || obfuscationPinningKCP) && transport.getString(TYPE).equals(OBFS4_KCP.toString())) {
-                        obfs4TKcpTransport = transport;
+                        break;
                     }
                 }
             }
@@ -154,13 +148,6 @@ public class VpnConfigGenerator {
                 e.printStackTrace();
             }
         }
-        if (supportsObfs4Kcp()) {
-            try {
-                profiles.put(OBFS4_KCP, createProfile(OBFS4_KCP));
-            } catch (ConfigParser.ConfigParseError | NumberFormatException | JSONException | IOException e) {
-                e.printStackTrace();
-            }
-        }
         if (profiles.isEmpty()) {
             throw new ConfigParser.ConfigParseError("No supported transports detected.");
         }
@@ -171,11 +158,7 @@ public class VpnConfigGenerator {
         return !useObfuscationPinning && !gatewayConfiguration(OPENVPN).isEmpty();
     }
     private boolean supportsObfs4(){
-        return obfs4Transport != null && !(useObfuscationPinning && obfuscationPinningKCP);
-    }
-
-    private boolean supportsObfs4Kcp() {
-        return obfs4TKcpTransport != null && !(useObfuscationPinning && !obfuscationPinningKCP);
+        return obfs4Transport != null || useObfuscationPinning;
     }
 
     private String getConfigurationString(TransportType transportType) {
@@ -194,9 +177,10 @@ public class VpnConfigGenerator {
         ConfigParser icsOpenvpnConfigParser = new ConfigParser();
         icsOpenvpnConfigParser.parseConfig(new StringReader(configuration));
         if (transportType == OBFS4) {
-            icsOpenvpnConfigParser.setObfs4Options(getObfs4Options(obfs4Transport, false));
-        } else if (transportType == OBFS4_KCP) {
-            icsOpenvpnConfigParser.setObfs4Options(getObfs4Options(obfs4TKcpTransport, true));
+            JSONArray protocols = obfs4Transport.getJSONArray(PROTOCOLS);
+            // FIXME: currently only one protocol per obfs4 bridge is supported in this client
+            String protocol = protocols.optString(0);
+            icsOpenvpnConfigParser.setObfs4Options(getObfs4Options(obfs4Transport, protocol.equalsIgnoreCase("kcp")));
         }
 
         VpnProfile profile = icsOpenvpnConfigParser.convertProfile(transportType);
@@ -208,7 +192,6 @@ public class VpnConfigGenerator {
         return profile;
     }
 
-    // TODO: whad does
     private Obfs4Options getObfs4Options(JSONObject transportJson, boolean useUdp) throws JSONException {
         JSONObject transportOptions = transportJson.getJSONObject(OPTIONS);
         String iatMode = transportOptions.getString("iatMode");
@@ -367,8 +350,7 @@ public class VpnConfigGenerator {
             case OPENVPN:
                 return "tcp".equals(protocol) || "udp".equals(protocol);
             case OBFS4:
-            case OBFS4_KCP:
-                return "tcp".equals(protocol);
+                return "tcp".equals(protocol) || "kcp".equals(protocol);
         }
         return false;
     }
@@ -446,10 +428,10 @@ public class VpnConfigGenerator {
         String remote;
         if (useObfsVpn()) {
             if (useObfuscationPinning) {
-                remote = REMOTE + " " + obfuscationPinningIP + " " + obfuscationPinningPort + newLine;
+                remote = REMOTE + " " + obfuscationPinningIP + " " + obfuscationPinningPort + " tcp" + newLine;
                 route = "route " + obfuscationPinningIP + " 255.255.255.255 net_gateway" + newLine;
             } else {
-                remote = REMOTE + " " + ipAddress + " " + ports.getString(0) + newLine;
+                remote = REMOTE + " " + ipAddress + " " + ports.getString(0) + " tcp" + newLine;
             }
         } else {
             remote = REMOTE + " " + DISPATCHER_IP + " " + DISPATCHER_PORT + " tcp" + newLine;