Disable image attachments for remote contacts alpha.

.gitlab-ci.yml

@@ -17,7 +17,7 @@ test:
 
   script:
     - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom animalSnifferMain animalSnifferTest
-    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom check compileOfficialDebugAndroidTestSources compileScreenshotDebugAndroidTestSources
+    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom test
 
   after_script:
     # these file change every time but should not be cached

.idea/codeStyles/Project.xml

@@ -1,10 +1,16 @@
 <component name="ProjectCodeStyleConfiguration">
   <code_scheme name="Project" version="173">
+    <option name="RIGHT_MARGIN" value="100" />
     <AndroidXmlCodeStyleSettings>
-      <option name="ARRANGEMENT_SETTINGS_MIGRATED_TO_191" value="true" />
+      <option name="USE_CUSTOM_SETTINGS" value="true" />
     </AndroidXmlCodeStyleSettings>
     <JavaCodeStyleSettings>
       <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
+      <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+      <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+      <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
+        <value />
+      </option>
       <option name="IMPORT_LAYOUT_TABLE">
         <value>
           <package name="android" withSubpackages="true" static="false" />
@@ -71,6 +77,7 @@
       </indentOptions>
     </codeStyleSettings>
     <codeStyleSettings language="XML">
+      <option name="FORCE_REARRANGE_MODE" value="1" />
       <indentOptions>
         <option name="CONTINUATION_INDENT_SIZE" value="4" />
         <option name="USE_TAB_CHARACTER" value="true" />
@@ -83,8 +90,7 @@
               <match>
                 <AND>
                   <NAME>xmlns:android</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                  <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
                 </AND>
               </match>
             </rule>
@@ -94,8 +100,7 @@
               <match>
                 <AND>
                   <NAME>xmlns:.*</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                  <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
                 </AND>
               </match>
               <order>BY_NAME</order>
@@ -106,7 +111,6 @@
               <match>
                 <AND>
                   <NAME>.*:id</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                 </AND>
               </match>
@@ -117,7 +121,6 @@
               <match>
                 <AND>
                   <NAME>.*:name</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                 </AND>
               </match>
@@ -128,7 +131,6 @@
               <match>
                 <AND>
                   <NAME>name</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
@@ -139,7 +141,6 @@
               <match>
                 <AND>
                   <NAME>style</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
@@ -150,7 +151,6 @@
               <match>
                 <AND>
                   <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
@@ -161,12 +161,64 @@
             <rule>
               <match>
                 <AND>
-                  <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
+                  <NAME>.*:layout_width</NAME>
                   <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                 </AND>
               </match>
-              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:layout_height</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:layout_.*</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:width</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:height</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
             </rule>
           </section>
           <section>
@@ -174,7 +226,6 @@
               <match>
                 <AND>
                   <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>.*</XML_NAMESPACE>
                 </AND>
               </match>

bramble-android/build.gradle

@@ -5,31 +5,23 @@ apply plugin: 'witness'
 apply from: 'witness.gradle'
 
 android {
-	compileSdkVersion 29
-	buildToolsVersion '29.0.2'
+	compileSdkVersion 28
+	buildToolsVersion '28.0.3'
 
 	defaultConfig {
-		minSdkVersion 16
-		targetSdkVersion 28
-		versionCode 10207
-		versionName "1.2.7"
+		minSdkVersion 14
+		targetSdkVersion 26
+		versionCode 10107
+		versionName "1.1.7"
 		consumerProguardFiles 'proguard-rules.txt'
 
-		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 	}
 
 	compileOptions {
 		sourceCompatibility JavaVersion.VERSION_1_8
 		targetCompatibility JavaVersion.VERSION_1_8
 	}
-
-	lintOptions {
-		// FIXME
-		warning "LintError"
-		warning "InvalidPackage"
-		warning "MissingPermission"
-		warning "InlinedApi", "ObsoleteSdkInt", "Override", "NewApi", "UnusedAttribute"
-	}
 }
 
 configurations {
@@ -38,10 +30,10 @@ configurations {
 
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	tor 'org.briarproject:tor-android:0.3.5.9@zip'
-	tor 'org.briarproject:obfs4proxy-android:0.0.11-2@zip'
+	tor 'org.briarproject:tor-android:0.3.5.8@zip'
+	tor 'org.briarproject:obfs4proxy-android:0.0.9@zip'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
@@ -67,8 +59,6 @@ task unpackTorBinaries {
 		copy {
 			from configurations.tor.collect { zipTree(it) }
 			into torBinariesDir
-			// TODO: Remove after next Tor upgrade, which won't include non-PIE binaries
-			include 'geoip.zip', '*_pie.zip'
 		}
 	}
 	dependsOn cleanTorBinaries

bramble-android/src/main/java/org/briarproject/bramble/BrambleAndroidEagerSingletons.java

@@ -11,14 +11,4 @@ public interface BrambleAndroidEagerSingletons {
 	void inject(AndroidNetworkModule.EagerSingletons init);
 
 	void inject(ReportingModule.EagerSingletons init);
-
-	class Helper {
-
-		public static void injectEagerSingletons(
-				BrambleAndroidEagerSingletons c) {
-			c.inject(new AndroidBatteryModule.EagerSingletons());
-			c.inject(new AndroidNetworkModule.EagerSingletons());
-			c.inject(new ReportingModule.EagerSingletons());
-		}
-	}
 }

bramble-android/src/main/java/org/briarproject/bramble/BrambleAndroidModule.java

@@ -18,4 +18,10 @@ import dagger.Module;
 		SocksModule.class
 })
 public class BrambleAndroidModule {
+
+	public static void initEagerSingletons(BrambleAndroidEagerSingletons c) {
+		c.inject(new AndroidBatteryModule.EagerSingletons());
+		c.inject(new AndroidNetworkModule.EagerSingletons());
+		c.inject(new ReportingModule.EagerSingletons());
+	}
 }

bramble-android/src/main/java/org/briarproject/bramble/account/AndroidAccountManager.java

@@ -12,16 +12,13 @@ import org.briarproject.bramble.api.identity.IdentityManager;
 
 import java.io.File;
 import java.util.HashSet;
-import java.util.List;
 import java.util.Set;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
 import javax.inject.Inject;
 
 import static android.os.Build.VERSION.SDK_INT;
-import static java.util.Arrays.asList;
 import static java.util.logging.Level.INFO;
 import static org.briarproject.bramble.util.IoUtils.deleteFileOrDir;
 import static org.briarproject.bramble.util.LogUtils.logFileOrDir;
@@ -32,11 +29,7 @@ class AndroidAccountManager extends AccountManagerImpl
 	private static final Logger LOG =
 			Logger.getLogger(AndroidAccountManager.class.getName());
 
-	/**
-	 * Directories that shouldn't be deleted when deleting the user's account.
-	 */
-	private static final List<String> PROTECTED_DIR_NAMES =
-			asList("cache", "code_cache", "lib", "shared_prefs");
+	private static final String PREF_DB_KEY = "key";
 
 	protected final Context appContext;
 	private final SharedPreferences prefs;
@@ -60,6 +53,36 @@ class AndroidAccountManager extends AccountManagerImpl
 		return exists;
 	}
 
+	// Locking: stateChangeLock
+	@Override
+	@Nullable
+	protected String loadEncryptedDatabaseKey() {
+		String key = getDatabaseKeyFromPreferences();
+		if (key == null) key = super.loadEncryptedDatabaseKey();
+		else migrateDatabaseKeyToFile(key);
+		return key;
+	}
+
+	// Locking: stateChangeLock
+	@Nullable
+	private String getDatabaseKeyFromPreferences() {
+		String key = prefs.getString(PREF_DB_KEY, null);
+		if (key == null) LOG.info("No database key in preferences");
+		else LOG.info("Found database key in preferences");
+		return key;
+	}
+
+	// Locking: stateChangeLock
+	private void migrateDatabaseKeyToFile(String key) {
+		if (storeEncryptedDatabaseKey(key)) {
+			if (prefs.edit().remove(PREF_DB_KEY).commit())
+				LOG.info("Database key migrated to file");
+			else LOG.warning("Database key not removed from preferences");
+		} else {
+			LOG.warning("Database key not migrated to file");
+		}
+	}
+
 	@Override
 	public void deleteAccount() {
 		synchronized (stateChangeLock) {
@@ -82,14 +105,14 @@ class AndroidAccountManager extends AccountManagerImpl
 		return PreferenceManager.getDefaultSharedPreferences(appContext);
 	}
 
-	@GuardedBy("stateChangeLock")
+	// Locking: stateChangeLock
 	private void deleteAppData(SharedPreferences... clear) {
 		// Clear and commit shared preferences
 		for (SharedPreferences prefs : clear) {
 			if (!prefs.edit().clear().commit())
 				LOG.warning("Could not clear shared preferences");
 		}
-		// Delete files, except protected directories
+		// Delete files, except lib and shared_prefs directories
 		Set<File> files = new HashSet<>();
 		File dataDir = getDataDir();
 		@Nullable
@@ -98,12 +121,14 @@ class AndroidAccountManager extends AccountManagerImpl
 			LOG.warning("Could not list files in app data dir");
 		} else {
 			for (File file : fileArray) {
-				if (!PROTECTED_DIR_NAMES.contains(file.getName())) {
+				String name = file.getName();
+				if (!name.equals("lib") && !name.equals("shared_prefs")) {
 					files.add(file);
 				}
 			}
 		}
 		files.add(appContext.getFilesDir());
+		files.add(appContext.getCacheDir());
 		addIfNotNull(files, appContext.getExternalCacheDir());
 		if (SDK_INT >= 19) {
 			for (File file : appContext.getExternalCacheDirs()) {
@@ -115,16 +140,12 @@ class AndroidAccountManager extends AccountManagerImpl
 				addIfNotNull(files, file);
 			}
 		}
-		// Clear the cache directory but don't delete it
-		File cacheDir = appContext.getCacheDir();
-		File[] children = cacheDir.listFiles();
-		if (children != null) files.addAll(asList(children));
 		for (File file : files) {
-			if (LOG.isLoggable(INFO)) {
-				LOG.info("Deleting " + file.getAbsolutePath());
-			}
 			deleteFileOrDir(file);
 		}
+		// Recreate the cache dir as some OpenGL drivers expect it to exist
+		if (!new File(dataDir, "cache").mkdirs())
+			LOG.warning("Could not recreate cache dir");
 	}
 
 	private File getDataDir() {

bramble-android/src/main/java/org/briarproject/bramble/network/AndroidNetworkManager.java

@@ -32,7 +32,6 @@ import static android.content.Intent.ACTION_SCREEN_OFF;
 import static android.content.Intent.ACTION_SCREEN_ON;
 import static android.net.ConnectivityManager.CONNECTIVITY_ACTION;
 import static android.net.ConnectivityManager.TYPE_WIFI;
-import static android.net.wifi.p2p.WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
 import static java.util.concurrent.TimeUnit.MINUTES;
@@ -77,9 +76,9 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		filter.addAction(ACTION_SCREEN_ON);
 		filter.addAction(ACTION_SCREEN_OFF);
 		filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
-		filter.addAction(WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
 		if (SDK_INT >= 23) filter.addAction(ACTION_DEVICE_IDLE_MODE_CHANGED);
 		appContext.registerReceiver(networkStateReceiver, filter);
+
 	}
 
 	@Override
@@ -137,8 +136,7 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		}
 
 		private boolean isApEvent(@Nullable String action) {
-			return WIFI_AP_STATE_CHANGED_ACTION.equals(action) ||
-					WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action);
+			return WIFI_AP_STATE_CHANGED_ACTION.equals(action);
 		}
 	}
 }

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java

@@ -8,34 +8,24 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.os.ParcelUuid;
-import android.os.Parcelable;
 
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
-import org.briarproject.bramble.api.plugin.DiscoveryHandler;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.PluginException;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.util.AndroidUtils;
 import org.briarproject.bramble.util.IoUtils;
 
 import java.io.IOException;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.nio.ByteBuffer;
 import java.security.SecureRandom;
 import java.util.ArrayList;
-import java.util.HashMap;
+import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.TreeSet;
 import java.util.UUID;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.ExecutionException;
@@ -57,25 +47,12 @@ import static android.bluetooth.BluetoothAdapter.SCAN_MODE_NONE;
 import static android.bluetooth.BluetoothAdapter.STATE_OFF;
 import static android.bluetooth.BluetoothAdapter.STATE_ON;
 import static android.bluetooth.BluetoothDevice.ACTION_FOUND;
-import static android.bluetooth.BluetoothDevice.ACTION_UUID;
-import static android.bluetooth.BluetoothDevice.DEVICE_TYPE_LE;
 import static android.bluetooth.BluetoothDevice.EXTRA_DEVICE;
-import static android.bluetooth.BluetoothDevice.EXTRA_UUID;
-import static android.os.Build.VERSION.SDK_INT;
-import static java.nio.ByteOrder.LITTLE_ENDIAN;
-import static java.util.Arrays.asList;
-import static java.util.Collections.emptyList;
-import static java.util.Collections.shuffle;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_ADDRESS;
-import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_UUID;
-import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
-import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -84,9 +61,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 	private static final Logger LOG =
 			getLogger(AndroidBluetoothPlugin.class.getName());
 
-	private static final int MIN_DEVICE_DISCOVERY_MS = 2_000;
-	private static final int MAX_DEVICE_DISCOVERY_MS = 30_000;
-	private static final int MAX_SERVICE_DISCOVERY_MS = 15_000;
+	private static final int MAX_DISCOVERY_MS = 10_000;
 
 	private final AndroidExecutor androidExecutor;
 	private final Context appContext;
@@ -160,42 +135,17 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 	@Override
 	void disableAdapterIfEnabledByUs() {
 		if (isAdapterEnabled() && wasEnabledByUs) {
-			cancelDiscoverability();
 			if (adapter.disable()) LOG.info("Disabling Bluetooth");
 			else LOG.info("Could not disable Bluetooth");
 			wasEnabledByUs = false;
 		}
 	}
 
-	private void cancelDiscoverability() {
-		if (adapter.getScanMode() == SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
-			try {
-				Method setDiscoverableTimeout = BluetoothAdapter.class
-						.getDeclaredMethod("setDiscoverableTimeout", int.class);
-				setDiscoverableTimeout.setAccessible(true);
-				setDiscoverableTimeout.invoke(adapter, 1);
-				LOG.info("Cancelled discoverability");
-			} catch (NoSuchMethodException e) {
-				logException(LOG, WARNING, e);
-			} catch (IllegalAccessException e) {
-				logException(LOG, WARNING, e);
-			} catch (InvocationTargetException e) {
-				logException(LOG, WARNING, e);
-			}
-		}
-	}
-
 	@Override
 	void setEnabledByUs() {
 		wasEnabledByUs = true;
 	}
 
-	@Override
-	void onAdapterDisabled() {
-		super.onAdapterDisabled();
-		wasEnabledByUs = false;
-	}
-
 	@Override
 	@Nullable
 	String getBluetoothAddress() {
@@ -250,8 +200,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 	@Nullable
 	DuplexTransportConnection discoverAndConnect(String uuid) {
 		if (adapter == null) return null;
-		for (BluetoothDevice d : discoverDevices()) {
-			String address = d.getAddress();
+		for (String address : discoverDevices()) {
 			try {
 				if (LOG.isLoggable(INFO))
 					LOG.info("Connecting to " + scrubMacAddress(address));
@@ -267,184 +216,10 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		return null;
 	}
 
-	@Override
-	public boolean supportsDiscovery() {
-		return true;
-	}
-
-	@Override
-	public void discoverPeers(
-			List<Pair<TransportProperties, DiscoveryHandler>> properties) {
-		// Discover all nearby devices
-		List<BluetoothDevice> devices = discoverDevices();
-		if (devices.isEmpty()) {
-			LOG.info("No devices discovered");
-			return;
-		}
-
-		List<Pair<TransportProperties, DiscoveryHandler>> discovered =
-				new ArrayList<>();
-		Map<String, Pair<TransportProperties, DiscoveryHandler>> byUuid =
-				new HashMap<>();
-		Map<String, Pair<TransportProperties, DiscoveryHandler>> byAddress =
-				new HashMap<>();
-		for (Pair<TransportProperties, DiscoveryHandler> pair : properties) {
-			TransportProperties p = pair.getFirst();
-			String uuid = p.get(PROP_UUID);
-			if (!isNullOrEmpty(uuid)) {
-				byUuid.put(uuid, pair);
-				String address = p.get(PROP_ADDRESS);
-				if (!isNullOrEmpty(address)) byAddress.put(address, pair);
-			}
-		}
-
-		List<BluetoothDevice> unknown = new ArrayList<>(devices);
-		for (BluetoothDevice d : devices) {
-			Pair<TransportProperties, DiscoveryHandler> pair =
-					byAddress.remove(d.getAddress());
-			if (pair == null) {
-				// Try cached UUIDs
-				for (String uuid : getUuids(d)) {
-					pair = byUuid.remove(uuid);
-					if (pair != null) {
-						if (LOG.isLoggable(INFO)) {
-							LOG.info("Matched "
-									+ scrubMacAddress(d.getAddress())
-									+ " by cached UUID");
-						}
-						TransportProperties p =
-								new TransportProperties(pair.getFirst());
-						p.put(PROP_ADDRESS, d.getAddress());
-						discovered.add(new Pair<>(p, pair.getSecond()));
-						unknown.remove(d);
-						break;
-					}
-				}
-			} else {
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Matched " + scrubMacAddress(d.getAddress())
-							+ " by address");
-				}
-				discovered.add(pair);
-				unknown.remove(d);
-			}
-		}
-		if (unknown.isEmpty()) {
-			LOG.info("All discovered devices are known, not fetching UUIDs");
-			return;
-		}
-		// Fetch up-to-date UUIDs
-		if (LOG.isLoggable(INFO))
-			LOG.info("Fetching UUIDs for " + unknown.size() + " devices");
+	private Collection<String> discoverDevices() {
+		List<String> addresses = new ArrayList<>();
 		BlockingQueue<Intent> intents = new LinkedBlockingQueue<>();
-		QueueingReceiver receiver = new QueueingReceiver(intents);
-		IntentFilter filter = new IntentFilter();
-		filter.addAction(ACTION_UUID);
-		appContext.registerReceiver(receiver, filter);
-		try {
-			List<BluetoothDevice> pending = new ArrayList<>();
-			for (BluetoothDevice d : unknown) {
-				if (d.fetchUuidsWithSdp()) {
-					if (LOG.isLoggable(INFO)) {
-						LOG.info("Fetching UUIDs for "
-								+ scrubMacAddress(d.getAddress()));
-					}
-					pending.add(d);
-				} else {
-					if (LOG.isLoggable(INFO)) {
-						LOG.info("Failed to fetch UUIDs for "
-								+ scrubMacAddress(d.getAddress()));
-					}
-				}
-			}
-			long now = clock.currentTimeMillis();
-			long end = now + MAX_SERVICE_DISCOVERY_MS;
-			while (now < end && !pending.isEmpty()) {
-				Intent i = intents.poll(end - now, MILLISECONDS);
-				if (i == null) break;
-				BluetoothDevice d = requireNonNull(
-						i.getParcelableExtra(EXTRA_DEVICE));
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Fetched UUIDs for "
-							+ scrubMacAddress(d.getAddress()));
-				}
-				Set<String> uuids = getUuids(d);
-				Parcelable[] extra = i.getParcelableArrayExtra(EXTRA_UUID);
-				if (extra != null) {
-					for (Parcelable p : extra) {
-						uuids.addAll(getUuidStrings((ParcelUuid) p));
-					}
-				}
-				for (String uuid : uuids) {
-					Pair<TransportProperties, DiscoveryHandler> pair =
-							byUuid.remove(uuid);
-					if (pair != null) {
-						if (LOG.isLoggable(INFO)) {
-							LOG.info("Matched "
-									+ scrubMacAddress(d.getAddress())
-									+ " by fetched UUID");
-						}
-						TransportProperties p =
-								new TransportProperties(pair.getFirst());
-						p.put(PROP_ADDRESS, d.getAddress());
-						discovered.add(new Pair<>(p, pair.getSecond()));
-						break;
-					}
-				}
-				pending.remove(d);
-				now = clock.currentTimeMillis();
-			}
-			if (LOG.isLoggable(INFO)) {
-				if (pending.isEmpty()) {
-					LOG.info("Finished fetching UUIDs");
-				} else {
-					LOG.info("Failed to fetch UUIDs for " + pending.size()
-							+ " devices");
-				}
-			}
-		} catch (InterruptedException e) {
-			LOG.info("Interrupted while fetching UUIDs");
-			Thread.currentThread().interrupt();
-		} finally {
-			appContext.unregisterReceiver(receiver);
-		}
-
-		if (LOG.isLoggable(INFO)) {
-			LOG.info("Discovered " + discovered.size() + " contacts");
-		}
-		for (Pair<TransportProperties, DiscoveryHandler> pair : discovered) {
-			pair.getSecond().handleDevice(pair.getFirst());
-		}
-	}
-
-	private Set<String> getUuids(BluetoothDevice d) {
-		Set<String> strings = new TreeSet<>();
-		ParcelUuid[] uuids = d.getUuids();
-		if (uuids == null) return strings;
-		for (ParcelUuid u : uuids) strings.addAll(getUuidStrings(u));
-		return strings;
-	}
-
-	// Workaround for https://code.google.com/p/android/issues/detail?id=197341
-	private List<String> getUuidStrings(ParcelUuid u) {
-		UUID forwards = u.getUuid();
-		ByteBuffer buf = ByteBuffer.allocate(16);
-		buf.putLong(forwards.getLeastSignificantBits());
-		buf.putLong(forwards.getMostSignificantBits());
-		buf.rewind();
-		buf.order(LITTLE_ENDIAN);
-		UUID backwards = new UUID(buf.getLong(), buf.getLong());
-		return asList(forwards.toString(), backwards.toString());
-	}
-
-	private List<BluetoothDevice> discoverDevices() {
-		if (adapter.isDiscovering()) {
-			LOG.info("Already discovering");
-			return emptyList();
-		}
-		List<BluetoothDevice> devices = new ArrayList<>();
-		BlockingQueue<Intent> intents = new LinkedBlockingQueue<>();
-		QueueingReceiver receiver = new QueueingReceiver(intents);
+		DiscoveryReceiver receiver = new DiscoveryReceiver(intents);
 		IntentFilter filter = new IntentFilter();
 		filter.addAction(ACTION_DISCOVERY_STARTED);
 		filter.addAction(ACTION_DISCOVERY_FINISHED);
@@ -452,9 +227,8 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		appContext.registerReceiver(receiver, filter);
 		try {
 			if (adapter.startDiscovery()) {
-				long start = clock.currentTimeMillis();
-				long end = start + MAX_DEVICE_DISCOVERY_MS;
-				long now = start;
+				long now = clock.currentTimeMillis();
+				long end = now + MAX_DISCOVERY_MS;
 				while (now < end) {
 					Intent i = intents.poll(end - now, MILLISECONDS);
 					if (i == null) break;
@@ -463,27 +237,14 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 						LOG.info("Discovery started");
 					} else if (ACTION_DISCOVERY_FINISHED.equals(action)) {
 						LOG.info("Discovery finished");
-						now = clock.currentTimeMillis();
-						if (now - start < MIN_DEVICE_DISCOVERY_MS) {
-							LOG.info("Discovery finished quickly, retrying");
-							if (!adapter.startDiscovery()) {
-								LOG.info("Could not restart discovery");
-								break;
-							}
-						} else {
-							break;
-						}
+						break;
 					} else if (ACTION_FOUND.equals(action)) {
-						BluetoothDevice d = requireNonNull(
-								i.getParcelableExtra(EXTRA_DEVICE));
-						// Ignore Bluetooth LE devices
-						if (SDK_INT < 18 || d.getType() != DEVICE_TYPE_LE) {
-							if (LOG.isLoggable(INFO)) {
-								LOG.info("Discovered "
-										+ scrubMacAddress(d.getAddress()));
-							}
-							if (!devices.contains(d)) devices.add(d);
-						}
+						BluetoothDevice d = i.getParcelableExtra(EXTRA_DEVICE);
+						String address = d.getAddress();
+						if (LOG.isLoggable(INFO))
+							LOG.info("Discovered " + scrubMacAddress(address));
+						if (!addresses.contains(address))
+							addresses.add(address);
 					}
 					now = clock.currentTimeMillis();
 				}
@@ -498,9 +259,9 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 			adapter.cancelDiscovery();
 			appContext.unregisterReceiver(receiver);
 		}
-		// Shuffle the devices so we don't always try the same one first
-		shuffle(devices);
-		return devices;
+		// Shuffle the addresses so we don't always try the same one first
+		Collections.shuffle(addresses);
+		return addresses;
 	}
 
 	private class BluetoothStateReceiver extends BroadcastReceiver {
@@ -521,11 +282,11 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		}
 	}
 
-	private static class QueueingReceiver extends BroadcastReceiver {
+	private static class DiscoveryReceiver extends BroadcastReceiver {
 
 		private final BlockingQueue<Intent> intents;
 
-		private QueueingReceiver(BlockingQueue<Intent> intents) {
+		private DiscoveryReceiver(BlockingQueue<Intent> intents) {
 			this.intents = intents;
 		}
 

bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java

@@ -9,17 +9,17 @@ import android.net.wifi.WifiManager;
 
 import org.briarproject.bramble.PoliteExecutor;
 import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.network.event.NetworkStatusEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.PluginCallback;
-import org.briarproject.bramble.api.settings.Settings;
 
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.Socket;
 import java.net.UnknownHostException;
-import java.util.List;
+import java.util.Collection;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
@@ -32,18 +32,27 @@ import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
-import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.INACTIVE;
-import static org.briarproject.bramble.util.IoUtils.tryToClose;
 
 @NotNullByDefault
-class AndroidLanTcpPlugin extends LanTcpPlugin {
+class AndroidLanTcpPlugin extends LanTcpPlugin implements EventListener {
 
 	private static final Logger LOG =
 			getLogger(AndroidLanTcpPlugin.class.getName());
 
+	private static final byte[] WIFI_AP_ADDRESS_BYTES =
+			{(byte) 192, (byte) 168, 43, 1};
+	private static final InetAddress WIFI_AP_ADDRESS;
+
+	static {
+		try {
+			WIFI_AP_ADDRESS = InetAddress.getByAddress(WIFI_AP_ADDRESS_BYTES);
+		} catch (UnknownHostException e) {
+			// Should only be thrown if the address has an illegal length
+			throw new AssertionError(e);
+		}
+	}
+
 	private final Executor connectionStatusExecutor;
 	private final ConnectivityManager connectivityManager;
 	@Nullable
@@ -53,9 +62,8 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 
 	AndroidLanTcpPlugin(Executor ioExecutor, Context appContext,
 			Backoff backoff, PluginCallback callback, int maxLatency,
-			int maxIdleTime, int connectionTimeout) {
-		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime,
-				connectionTimeout);
+			int maxIdleTime) {
+		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime);
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor =
 				new PoliteExecutor("AndroidLanTcpPlugin", ioExecutor, 1);
@@ -71,31 +79,32 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	@Override
 	public void start() {
 		if (used.getAndSet(true)) throw new IllegalStateException();
-		initialisePortProperty();
-		Settings settings = callback.getSettings();
-		state.setStarted(settings.getBoolean(PREF_PLUGIN_ENABLE, false));
+		running = true;
 		updateConnectionStatus();
 	}
 
+	@Override
+	public void stop() {
+		running = false;
+		tryToClose(socket);
+	}
+
 	@Override
 	protected Socket createSocket() throws IOException {
 		return socketFactory.createSocket();
 	}
 
 	@Override
-	protected List<InetAddress> getUsableLocalInetAddresses() {
+	protected Collection<InetAddress> getLocalIpAddresses() {
 		// If the device doesn't have wifi, don't open any sockets
 		if (wifiManager == null) return emptyList();
-		// If we're connected to a wifi network, return its address
+		// If we're connected to a wifi network, use that network
 		WifiInfo info = wifiManager.getConnectionInfo();
-		if (info != null && info.getIpAddress() != 0) {
+		if (info != null && info.getIpAddress() != 0)
 			return singletonList(intToInetAddress(info.getIpAddress()));
-		}
 		// If we're running an access point, return its address
-		for (InetAddress addr : getLocalInetAddresses()) {
-			if (addr.equals(WIFI_AP_ADDRESS)) return singletonList(addr);
-			if (addr.equals(WIFI_DIRECT_AP_ADDRESS)) return singletonList(addr);
-		}
+		if (super.getLocalIpAddresses().contains(WIFI_AP_ADDRESS))
+			return singletonList(WIFI_AP_ADDRESS);
 		// No suitable addresses
 		return emptyList();
 	}
@@ -129,38 +138,29 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 
 	@Override
 	public void eventOccurred(Event e) {
-		super.eventOccurred(e);
 		if (e instanceof NetworkStatusEvent) updateConnectionStatus();
 	}
 
 	private void updateConnectionStatus() {
 		connectionStatusExecutor.execute(() -> {
-			State s = getState();
-			if (s != ACTIVE && s != INACTIVE) return;
-			List<InetAddress> addrs = getLocalInetAddresses();
-			if (addrs.contains(WIFI_AP_ADDRESS)
-					|| addrs.contains(WIFI_DIRECT_AP_ADDRESS)) {
+			if (!running) return;
+			Collection<InetAddress> addrs = getLocalIpAddresses();
+			if (addrs.contains(WIFI_AP_ADDRESS)) {
 				LOG.info("Providing wifi hotspot");
 				// There's no corresponding Network object and thus no way
 				// to get a suitable socket factory, so we won't be able to
 				// make outgoing connections on API 21+ if another network
 				// has internet access
 				socketFactory = SocketFactory.getDefault();
-				if (s == INACTIVE) bind();
+				if (socket == null || socket.isClosed()) bind();
 			} else if (addrs.isEmpty()) {
 				LOG.info("Not connected to wifi");
 				socketFactory = SocketFactory.getDefault();
-				// Server socket may not have been closed automatically when
-				// interface was taken down. Socket will be cleared and state
-				// updated in acceptContactConnections()
-				if (s == ACTIVE) {
-					LOG.info("Closing server socket");
-					tryToClose(state.getServerSocket(), LOG, WARNING);
-				}
+				tryToClose(socket);
 			} else {
 				LOG.info("Connected to wifi");
 				socketFactory = getSocketFactory();
-				if (s == INACTIVE) bind();
+				if (socket == null || socket.isClosed()) bind();
 			}
 		});
 	}

bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPluginFactory.java

@@ -21,11 +21,10 @@ import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
 @NotNullByDefault
 public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 
-	private static final int MAX_LATENCY = 30_000; // 30 seconds
-	private static final int MAX_IDLE_TIME = 30_000; // 30 seconds
-	private static final int CONNECTION_TIMEOUT = 3_000; // 3 seconds
-	private static final int MIN_POLLING_INTERVAL = 60_000; // 1 minute
-	private static final int MAX_POLLING_INTERVAL = 600_000; // 10 mins
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
+	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
 	private static final double BACKOFF_BASE = 1.2;
 
 	private final Executor ioExecutor;
@@ -56,8 +55,7 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		AndroidLanTcpPlugin plugin = new AndroidLanTcpPlugin(ioExecutor,
-				appContext, backoff, callback, MAX_LATENCY, MAX_IDLE_TIME,
-				CONNECTION_TIMEOUT);
+				appContext, backoff, callback, MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/AndroidTorPlugin.java

@@ -74,6 +74,7 @@ class AndroidTorPlugin extends TorPlugin {
 
 	@Override
 	protected void enableNetwork(boolean enable) throws IOException {
+		if (!running) return;
 		if (enable) wakeLock.acquire();
 		super.enableNetwork(enable);
 		if (!enable) wakeLock.release();

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/AndroidTorPluginFactory.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.plugin.tor;
 
 import android.content.Context;
+import android.os.Build;
 
 import org.briarproject.bramble.api.battery.BatteryManager;
 import org.briarproject.bramble.api.event.EventBus;
@@ -88,15 +89,9 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 		// Check that we have a Tor binary for this architecture
 		String architecture = null;
 		for (String abi : AndroidUtils.getSupportedArchitectures()) {
-			if (abi.startsWith("x86_64")) {
-				architecture = "x86_64";
-				break;
-			} else if (abi.startsWith("x86")) {
+			if (abi.startsWith("x86")) {
 				architecture = "x86";
 				break;
-			} else if (abi.startsWith("arm64")) {
-				architecture = "arm64";
-				break;
 			} else if (abi.startsWith("armeabi")) {
 				architecture = "arm";
 				break;
@@ -106,8 +101,8 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 			LOG.info("Tor is not supported on this architecture");
 			return null;
 		}
-		// Use position-independent executable
-		architecture += "_pie";
+		// Use position-independent executable for SDK >= 16
+		if (Build.VERSION.SDK_INT >= 16) architecture += "_pie";
 
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidLocationUtils.java

@@ -61,12 +61,12 @@ class AndroidLocationUtils implements LocationUtils {
 	private String getCountryFromPhoneNetwork() {
 		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
 		TelephonyManager tm = (TelephonyManager) o;
-		return tm == null ? "" : tm.getNetworkCountryIso();
+		return tm.getNetworkCountryIso();
 	}
 
 	private String getCountryFromSimCard() {
 		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
 		TelephonyManager tm = (TelephonyManager) o;
-		return tm == null ? "" : tm.getSimCountryIso();
+		return tm.getSimCountryIso();
 	}
 }

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java

@@ -23,7 +23,6 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static android.content.Context.WIFI_SERVICE;
-import static android.os.Build.VERSION.SDK_INT;
 import static android.provider.Settings.Secure.ANDROID_ID;
 
 @Immutable
@@ -75,7 +74,8 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		// Silence strict mode
 		StrictMode.ThreadPolicy tp = StrictMode.allowThreadDiskWrites();
 		super.writeSeed();
-		if (SDK_INT <= 18) applyOpenSslFix();
+		if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT <= 18)
+			applyOpenSslFix();
 		StrictMode.setThreadPolicy(tp);
 	}
 

bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java

@@ -6,25 +6,15 @@ import android.content.Context;
 import android.os.Build;
 import android.provider.Settings;
 
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
 import java.io.File;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 
-import javax.annotation.Nullable;
-
 import static android.content.Context.MODE_PRIVATE;
 import static android.os.Build.VERSION.SDK_INT;
-import static java.util.Arrays.asList;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 
-@NotNullByDefault
 public class AndroidUtils {
 
 	// Fake Bluetooth address returned by BluetoothAdapter on API 23 and later
@@ -32,10 +22,11 @@ public class AndroidUtils {
 
 	private static final String STORED_REPORTS = "dev-reports";
 
+	@SuppressWarnings("deprecation")
 	public static Collection<String> getSupportedArchitectures() {
 		List<String> abis = new ArrayList<>();
 		if (SDK_INT >= 21) {
-			abis.addAll(asList(Build.SUPPORTED_ABIS));
+			abis.addAll(Arrays.asList(Build.SUPPORTED_ABIS));
 		} else {
 			abis.add(Build.CPU_ABI);
 			if (Build.CPU_ABI2 != null) abis.add(Build.CPU_ABI2);
@@ -45,76 +36,25 @@ public class AndroidUtils {
 
 	public static String getBluetoothAddress(Context ctx,
 			BluetoothAdapter adapter) {
-		return getBluetoothAddressAndMethod(ctx, adapter).getFirst();
-	}
-
-	public static Pair<String, String> getBluetoothAddressAndMethod(Context ctx,
-			BluetoothAdapter adapter) {
 		// Return the adapter's address if it's valid and not fake
 		@SuppressLint("HardwareIds")
 		String address = adapter.getAddress();
-		if (isValidBluetoothAddress(address)) {
-			return new Pair<>(address, "adapter");
-		}
+		if (isValidBluetoothAddress(address)) return address;
 		// Return the address from settings if it's valid and not fake
 		address = Settings.Secure.getString(ctx.getContentResolver(),
 				"bluetooth_address");
-		if (isValidBluetoothAddress(address)) {
-			return new Pair<>(address, "settings");
-		}
-		// Try to get the address via reflection
-		address = getBluetoothAddressByReflection(adapter);
-		if (isValidBluetoothAddress(address)) {
-			return new Pair<>(requireNonNull(address), "reflection");
-		}
+		if (isValidBluetoothAddress(address)) return address;
 		// Let the caller know we can't find the address
-		return new Pair<>("", "");
+		return "";
 	}
 
-	private static boolean isValidBluetoothAddress(@Nullable String address) {
+	private static boolean isValidBluetoothAddress(String address) {
 		return !StringUtils.isNullOrEmpty(address)
 				&& BluetoothAdapter.checkBluetoothAddress(address)
 				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
 	}
 
-	@Nullable
-	private static String getBluetoothAddressByReflection(
-			BluetoothAdapter adapter) {
-		try {
-			Field mServiceField =
-					adapter.getClass().getDeclaredField("mService");
-			mServiceField.setAccessible(true);
-			Object mService = mServiceField.get(adapter);
-			// mService may be null when Bluetooth is disabled
-			if (mService == null) throw new NoSuchFieldException();
-			Method getAddressMethod =
-					mService.getClass().getMethod("getAddress");
-			return (String) getAddressMethod.invoke(mService);
-		} catch (NoSuchFieldException e) {
-			return null;
-		} catch (IllegalAccessException e) {
-			return null;
-		} catch (NoSuchMethodException e) {
-			return null;
-		} catch (InvocationTargetException e) {
-			return null;
-		} catch (SecurityException e) {
-			return null;
-		}
-	}
-
 	public static File getReportDir(Context ctx) {
 		return ctx.getDir(STORED_REPORTS, MODE_PRIVATE);
 	}
-
-	/**
-	 * Returns an array of supported content types for image attachments.
-	 * GIFs can't be compressed on API < 24 so they're not supported.
-	 * <p>
-	 * TODO: Remove this restriction when large message support is added
-	 */
-	public static String[] getSupportedImageContentTypes() {
-		if (SDK_INT < 24) return new String[] {"image/jpeg", "image/png"};
-		else return new String[] {"image/jpeg", "image/png", "image/gif"};
-	}
 }

bramble-android/src/test/java/org/briarproject/bramble/account/AndroidAccountManagerTest.java

@@ -16,10 +16,13 @@ import org.junit.Test;
 
 import java.io.File;
 
+import static junit.framework.Assert.assertEquals;
 import static junit.framework.Assert.assertFalse;
 import static junit.framework.Assert.assertTrue;
 import static org.briarproject.bramble.test.TestUtils.deleteTestDirectory;
+import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.test.TestUtils.getTestDirectory;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
 
 public class AndroidAccountManagerTest extends BrambleMockTestCase {
 
@@ -37,8 +40,11 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 	private final Application app;
 	private final ApplicationInfo applicationInfo;
 
+	private final String encryptedKeyHex = toHexString(getRandomBytes(123));
 	private final File testDir = getTestDirectory();
 	private final File keyDir = new File(testDir, "key");
+	private final File keyFile = new File(keyDir, "db.key");
+	private final File keyBackupFile = new File(keyDir, "db.key.bak");
 	private final File dbDir = new File(testDir, "db");
 
 	private AndroidAccountManager accountManager;
@@ -69,12 +75,33 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		};
 	}
 
+	@Test
+	public void testDbKeyIsMigratedFromPreferencesToFile() {
+		context.checking(new Expectations() {{
+			oneOf(prefs).getString("key", null);
+			will(returnValue(encryptedKeyHex));
+			oneOf(prefs).edit();
+			will(returnValue(editor));
+			oneOf(editor).remove("key");
+			will(returnValue(editor));
+			oneOf(editor).commit();
+			will(returnValue(true));
+		}});
+
+		assertFalse(keyFile.exists());
+		assertFalse(keyBackupFile.exists());
+
+		assertEquals(encryptedKeyHex,
+				accountManager.loadEncryptedDatabaseKey());
+
+		assertTrue(keyFile.exists());
+		assertTrue(keyBackupFile.exists());
+	}
+
 	@Test
 	public void testDeleteAccountClearsSharedPrefsAndDeletesFiles()
 			throws Exception {
-		// Directories 'code_cache', 'lib' and 'shared_prefs' should be spared
-		File codeCacheDir = new File(testDir, "code_cache");
-		File codeCacheFile = new File(codeCacheDir, "file");
+		// Directories 'lib' and 'shared_prefs' should be spared
 		File libDir = new File(testDir, "lib");
 		File libFile = new File(libDir, "file");
 		File sharedPrefsDir = new File(testDir, "shared_prefs");
@@ -113,8 +140,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 
 		assertTrue(dbDir.mkdirs());
 		assertTrue(keyDir.mkdirs());
-		assertTrue(codeCacheDir.mkdirs());
-		assertTrue(codeCacheFile.createNewFile());
 		assertTrue(libDir.mkdirs());
 		assertTrue(libFile.createNewFile());
 		assertTrue(sharedPrefsDir.mkdirs());
@@ -130,8 +155,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 
 		assertFalse(dbDir.exists());
 		assertFalse(keyDir.exists());
-		assertTrue(codeCacheDir.exists());
-		assertTrue(codeCacheFile.exists());
 		assertTrue(libDir.exists());
 		assertTrue(libFile.exists());
 		assertTrue(sharedPrefsDir.exists());

bramble-android/witness.gradle

@@ -1,46 +1,44 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.android.tools.analytics-library:protos:26.5.1:protos-26.5.1.jar:8dde1130725461fe827f2a343d353f2b51e8870661fc860d7d5ebddb097ead4e',
-        'com.android.tools.analytics-library:shared:26.5.1:shared-26.5.1.jar:ccc2f3b00ec17b11401610ba68553544fc8fc517120e84439ac6eb86b875e18d',
-        'com.android.tools.analytics-library:tracker:26.5.1:tracker-26.5.1.jar:3a76984c0fe2e847ca7a8b35b4780ef0447a9d1666946cb8e60466318e0ab5ae',
-        'com.android.tools.build:aapt2-proto:0.4.0:aapt2-proto-0.4.0.jar:fac0435e08898f89eeeb9ca236bea707155ff816c12205ced285ad53604133ca',
-        'com.android.tools.build:apksig:3.5.1:apksig-3.5.1.jar:1fd33e7f009a2a0da766cfeec4211a09f548034b015c289a66d75dd8a9302f4a',
-        'com.android.tools.build:apkzlib:3.5.1:apkzlib-3.5.1.jar:9f330167cbe973b7db407692f74f4f6453b7ffa5f2048934b06280c2ceee60fa',
-        'com.android.tools.build:builder-model:3.5.1:builder-model-3.5.1.jar:39ea3c82b76b6e0c9f9fa88d93e0edc1dd4a0f1dfae0ef6fbf2d451da47e5450',
-        'com.android.tools.build:builder-test-api:3.5.1:builder-test-api-3.5.1.jar:a1b59305584cbcaa078fdc9cfb80871012755b822dd32e8da19add6f7bbcb762',
-        'com.android.tools.build:builder:3.5.1:builder-3.5.1.jar:e3a8d382434c5f60990730c4719fc814e85a898a33a1e96c1df8d627d3c6eea6',
-        'com.android.tools.build:gradle-api:3.5.1:gradle-api-3.5.1.jar:be9b41859bace11998f66b04ed944f87e413f3ad6da3c4665587699da125addc',
-        'com.android.tools.build:manifest-merger:26.5.1:manifest-merger-26.5.1.jar:dcad9ecb967251f4d750f55a4204a2b400e8fbfe5cb930a1d0d5dbe10ae8bdfc',
-        'com.android.tools.ddms:ddmlib:26.5.1:ddmlib-26.5.1.jar:b081aef2a4ed3f4d47cae4cdb128469735f25a114e026d37123bf9ffdec742a8',
-        'com.android.tools.external.com-intellij:intellij-core:26.5.1:intellij-core-26.5.1.jar:20eced30adc124805bd93488d9cd9d3e33e6bf7b48e9fe5a703d4983f894d450',
-        'com.android.tools.external.com-intellij:kotlin-compiler:26.5.1:kotlin-compiler-26.5.1.jar:5aed762dd54875b77ae7018d97c05756ff0c5b9fd02ec595dd396ccd14cc22cb',
-        'com.android.tools.external.org-jetbrains:uast:26.5.1:uast-26.5.1.jar:4bc8653d6c0943f40fee963a149e36c6baa45683d2530968a13f5007e3c40740',
-        'com.android.tools.layoutlib:layoutlib-api:26.5.1:layoutlib-api-26.5.1.jar:88732f11396c427273e515d23042e35633f4fe4295528a99b866aa2adf0efd9c',
-        'com.android.tools.lint:lint-api:26.5.1:lint-api-26.5.1.jar:ec33fcd72bfaf70dd841e03fbfd93f109c2e575aec146067c606689c3972f0de',
-        'com.android.tools.lint:lint-checks:26.5.1:lint-checks-26.5.1.jar:a1b9607d484aaae7a71dcecdc76f8003d8239af226c776894a2cf63f9e6c60d7',
-        'com.android.tools.lint:lint-gradle-api:26.5.1:lint-gradle-api-26.5.1.jar:82453fd98a8394cc84ed995c04d2cd744abd1d6589403427ba7eef53115406f3',
-        'com.android.tools.lint:lint-gradle:26.5.1:lint-gradle-26.5.1.jar:59465b56cf7db77c656d5f8195d721c3d48b6bdd0502d774de335bfe4baff00b',
-        'com.android.tools.lint:lint:26.5.1:lint-26.5.1.jar:336e4b04ec6f8b0f25879131b7a7862d77df83a1879ee5b71be26128755f8e2e',
-        'com.android.tools:annotations:26.5.1:annotations-26.5.1.jar:2c43c82f8c59d8f7a61e3239e1a2dc9f69dc342ec09af9b7c9f69b25337c0b6e',
-        'com.android.tools:common:26.5.1:common-26.5.1.jar:eccfa54486ed54c4e3123cc42195d023bd0dd21bcd2f0e4868e8c6fc70f8ef6b',
-        'com.android.tools:dvlib:26.5.1:dvlib-26.5.1.jar:46f93ad498b4756e7d867d2fe38c38890a80e7407a4ae459e4a8c8d5c5aeacfe',
-        'com.android.tools:repository:26.5.1:repository-26.5.1.jar:2b3ee791aa4c3e8ce60498c161a27ca7228816fc630eed4d9f25f2f36a106dce',
-        'com.android.tools:sdk-common:26.5.1:sdk-common-26.5.1.jar:365f749676c3574676fd465177c8a492f340816db2b520d6ed114d3b6e77bea7',
-        'com.android.tools:sdklib:26.5.1:sdklib-26.5.1.jar:007da104afb27c8c682a1628023fe9ec438249c8d15ef0fd6624c5bb8e23b696',
+        'com.android.tools.analytics-library:protos:26.4.0:protos-26.4.0.jar:ad760915586797d39319f402837b378bff3bb4ed583e3e0c48c965631fb2135f',
+        'com.android.tools.analytics-library:shared:26.4.0:shared-26.4.0.jar:1332106a905d48909c81268c9e414946de3e83487db394c6073b0a9b5c3d0ed2',
+        'com.android.tools.analytics-library:tracker:26.4.0:tracker-26.4.0.jar:d0020cfbfd4cd75935f2972d6a24089840d4a10df6f3ef2a796093217dd37796',
+        'com.android.tools.build:apksig:3.4.0:apksig-3.4.0.jar:91d5a1866139c69756280355a6f61b4d619d0516841580114f45a10f2177327e',
+        'com.android.tools.build:apkzlib:3.4.0:apkzlib-3.4.0.jar:8653c85f5fdf1dde840e8b8af7396aeb79c34b66e541b5860059616006535592',
+        'com.android.tools.build:builder-model:3.4.0:builder-model-3.4.0.jar:a88f138124a9f016a70bcb4760359a502f65c7deed56507ee4014f4dd9ea853b',
+        'com.android.tools.build:builder-test-api:3.4.0:builder-test-api-3.4.0.jar:31089ab1ec19ca7687a010867d2f3807513c805b8226979706f4247b5d4df26f',
+        'com.android.tools.build:builder:3.4.0:builder-3.4.0.jar:476221b5203a7f50089bf185ed95000a34b6f5020ef0a17815afd58606922679',
+        'com.android.tools.build:gradle-api:3.4.0:gradle-api-3.4.0.jar:215eca38f6719213c2f492b4d622cdd11676c66c9871f8a2aed0c66d00175628',
+        'com.android.tools.build:manifest-merger:26.4.0:manifest-merger-26.4.0.jar:29e45e690dedd165035e97c21c2ca94d0bd4ec16b6b210daa26669a582b6f220',
+        'com.android.tools.ddms:ddmlib:26.4.0:ddmlib-26.4.0.jar:93f56fe4630c3166adbd6c51d7bb602d96abb91b07ba5b1165fdcd071e88c940',
+        'com.android.tools.external.com-intellij:intellij-core:26.4.0:intellij-core-26.4.0.jar:30cb0e879d4424de9677a50b537fb628636b4a50f5470af5e52437980c41421f',
+        'com.android.tools.external.com-intellij:kotlin-compiler:26.4.0:kotlin-compiler-26.4.0.jar:dd1fe225c31a0e012dc025336363a5b783e2c5c20ffb69e77f8f57e89420d998',
+        'com.android.tools.external.org-jetbrains:uast:26.4.0:uast-26.4.0.jar:f25f3285b775a983327583ff6584dea54e447813ef69e0ce08b05a45b5f4aab0',
+        'com.android.tools.layoutlib:layoutlib-api:26.4.0:layoutlib-api-26.4.0.jar:52128f5cf293b224072be361919bfd416e59480ab7264ddcdbbf046b0d7a12e3',
+        'com.android.tools.lint:lint-api:26.4.0:lint-api-26.4.0.jar:fdb8fca8ae4c254f438338d03d72605e00ed106f2d5550405af41ca1c8509401',
+        'com.android.tools.lint:lint-checks:26.4.0:lint-checks-26.4.0.jar:4ff52d40488cd3e22b9c6b2eb67784e0c3269d0b42ef9d17689cd75a7b2bceb4',
+        'com.android.tools.lint:lint-gradle-api:26.4.0:lint-gradle-api-26.4.0.jar:714b7a85c7d2aa10daeab16e969fe7530c659d0728a7f24021da456870418d0f',
+        'com.android.tools.lint:lint-gradle:26.4.0:lint-gradle-26.4.0.jar:b8c130d273f522388734457e1b96790f41528fcec6fda9e8eaa4e4d95a07cfbb',
+        'com.android.tools.lint:lint:26.4.0:lint-26.4.0.jar:83aa062fb0405b60ed358d858c8c2955e1bae44a455b498068c6a60988755f00',
+        'com.android.tools:annotations:26.4.0:annotations-26.4.0.jar:a7955b8e19c3a2a861d6faa43a58b7c0d46ea9112188ee3e235c6f9f439ecc1a',
+        'com.android.tools:common:26.4.0:common-26.4.0.jar:ea40b94b3c1284ea7700f011388e2906a8363a66abd902891722b3c557984852',
+        'com.android.tools:dvlib:26.4.0:dvlib-26.4.0.jar:23af89c535b01ba36ceed1b6b309b672814eba624e643cd7dedf0519edad50cc',
+        'com.android.tools:repository:26.4.0:repository-26.4.0.jar:3d1763ab46199374dc6d94129bba11c70f1d5857e2c81a3ac4898abca40b176b',
+        'com.android.tools:sdk-common:26.4.0:sdk-common-26.4.0.jar:78a522525b30ffc6b7bf1299c831d24ce385f68a9f4878f8f752e9baefa31b0f',
+        'com.android.tools:sdklib:26.4.0:sdklib-26.4.0.jar:b854c23892013a326d761cf071c72cf3e038ed0469d10f4a356829fa56e4c132',
+        'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.code.gson:gson:2.8.5:gson-2.8.5.jar:233a0149fc365c9f6edbd683cfe266b19bdc773be98eabdaf6b3c924b48e7d81',
-        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
-        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
-        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
-        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
-        'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
+        'com.google.code.gson:gson:2.8.0:gson-2.8.0.jar:c6221763bd79c4f1c3dc7f750b5f29a0bb38b367b81314c4f71896e340c40825',
+        'com.google.dagger:dagger-compiler:2.22.1:dagger-compiler-2.22.1.jar:e5f28302cbe70a79d3620cddebfb8ec0736814f3980ffe1e673bfe3342f507d3',
+        'com.google.dagger:dagger-producers:2.22.1:dagger-producers-2.22.1.jar:f834a0082014213a68ff06a0f048d750178d02196c58b0b15beb367d32b97e35',
+        'com.google.dagger:dagger-spi:2.22.1:dagger-spi-2.22.1.jar:4b0b922793b3bcb91b99fabb75dba77c68afd7ae4c5f0c4fd6ba681f0a291c7d',
+        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
+        'com.google.errorprone:error_prone_annotations:2.1.3:error_prone_annotations-2.1.3.jar:03d0329547c13da9e17c634d1049ea2ead093925e290567e1a364fd6b1fc7ff8',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
-        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
-        'com.google.guava:guava:27.0.1-jre:guava-27.0.1-jre.jar:e1c814fd04492a27c38e0317eabeaa1b3e950ec8010239e400fe90ad6c9107b4',
-        'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
-        'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
+        'com.google.guava:guava:25.0-jre:guava-25.0-jre.jar:3fd4341776428c7e0e5c18a7c10de129475b69ab9d30aeafbb5c277bb6074fa9',
+        'com.google.guava:guava:26.0-jre:guava-26.0-jre.jar:a0e9cabad665bc20bcd2b01f108e5fc03f756e13aea80abaadb9f407033bea2c',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
         'com.google.protobuf:protobuf-java:3.4.0:protobuf-java-3.4.0.jar:dce7e66b32456a1b1198da0caff3a8acb71548658391e798c79369241e6490a4',
@@ -57,7 +55,6 @@ dependencyVerification {
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'javax.xml.bind:jaxb-api:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
-        'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'net.sf.jopt-simple:jopt-simple:4.9:jopt-simple-4.9.jar:26c5856e954b5f864db76f13b86919b59c6eecf9fd930b96baa8884626baf2f5',
         'net.sf.kxml:kxml2:2.3.0:kxml2-2.3.0.jar:f264dd9f79a1fde10ce5ecc53221eff24be4c9331c830b7d52f2f08a7b633de2',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
@@ -69,22 +66,22 @@ dependencyVerification {
         'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
         'org.bouncycastle:bcpkix-jdk15on:1.56:bcpkix-jdk15on-1.56.jar:7043dee4e9e7175e93e0b36f45b1ec1ecb893c5f755667e8b916eb8dd201c6ca',
         'org.bouncycastle:bcprov-jdk15on:1.56:bcprov-jdk15on-1.56.jar:963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349',
-        'org.briarproject:obfs4proxy-android:0.0.11-2:obfs4proxy-android-0.0.11-2.zip:57e55cbe87aa2aac210fdbb6cd8cdeafe15f825406a08ebf77a8b787aa2c6a8a',
-        'org.briarproject:tor-android:0.3.5.9:tor-android-0.3.5.9.zip:853b0440feccd6904bd03e6b2de53a62ebcde1d58068beeadc447a7dff950bc8',
+        'org.briarproject:obfs4proxy-android:0.0.9:obfs4proxy-android-0.0.9.zip:9b7e9181535ea8d8bbe8ae6338e08cf4c5fc1e357a779393e0ce49586d459ae0',
+        'org.briarproject:tor-android:0.3.5.8:tor-android-0.3.5.8.zip:42a13a6f185be1a62f42e3f30ce66a3c099ac5ec890a65e7593111b65b44a54a',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.codehaus.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
         'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
         'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
         'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
         'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
         'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
-        'org.jetbrains.kotlin:kotlin-reflect:1.3.50:kotlin-reflect-1.3.50.jar:64583199ea5a54aefd1bd1595288925f784226ee562d1dd279011c6075b3d7a4',
-        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50:kotlin-stdlib-common-1.3.50.jar:8ce678e88e4ba018b66dacecf952471e4d7dfee156a8a819760a5a5ff29d323c',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50:kotlin-stdlib-jdk7-1.3.50.jar:9a026639e76212f8d57b86d55b075394c2e009f1979110751d34c05c5f75d57b',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50:kotlin-stdlib-jdk8-1.3.50.jar:1b351fb6e09c14b55525c74c1f4cf48942eae43c348b7bc764a5e6e423d4da0c',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.3.50:kotlin-stdlib-1.3.50.jar:e6f05746ee0366d0b52825a090fac474dcf44082c9083bbb205bd16976488d6c',
+        'org.jetbrains.kotlin:kotlin-reflect:1.3.21:kotlin-reflect-1.3.21.jar:a3065c822633191e0a3e3ee12a29bec234fc4b2864a6bb87ef48cce3e9e0c26a',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.21:kotlin-stdlib-common-1.3.21.jar:cea61f7b611895e64f58569a9757fc0ab0d582f107211e1930e0ce2a0add52a7',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21:kotlin-stdlib-jdk7-1.3.21.jar:a87875604fd42140da6938ae4d35ee61081f4482536efc6d2615b8b626a198af',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21:kotlin-stdlib-jdk8-1.3.21.jar:5823ed66ac122a1c55442ebca5a209a843ccd87f562edc31a787f3d2e47f74d4',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.3.21:kotlin-stdlib-1.3.21.jar:38ba2370d9f06f50433e06b2ca775b94473c2e2785f410926079ab793c72b034',
         'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
         'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
         'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',

bramble-api/build.gradle

@@ -7,7 +7,7 @@ apply plugin: 'witness'
 apply from: 'witness.gradle'
 
 dependencies {
-	implementation "com.google.dagger:dagger:2.24"
+	implementation "com.google.dagger:dagger:2.22.1"
 	implementation 'com.google.code.findbugs:jsr305:3.0.2'
 
 	testImplementation 'junit:junit:4.12'

bramble-api/src/main/java/org/briarproject/bramble/api/FeatureFlags.java

@@ -1,9 +0,0 @@
-package org.briarproject.bramble.api;
-
-/**
- * Interface for specifying which features are enabled in a build.
- */
-public interface FeatureFlags {
-
-	boolean shouldEnableImageAttachments();
-}

bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java

@@ -25,10 +25,7 @@ public interface ClientHelper {
 			throws DbException, FormatException;
 
 	void addLocalMessage(Transaction txn, Message m, BdfDictionary metadata,
-			boolean shared, boolean temporary)
-			throws DbException, FormatException;
-
-	Message createMessage(GroupId g, long timestamp, byte[] body);
+			boolean shared) throws DbException, FormatException;
 
 	Message createMessage(GroupId g, long timestamp, BdfList body)
 			throws FormatException;
@@ -111,7 +108,7 @@ public interface ClientHelper {
 	Author parseAndValidateAuthor(BdfList author) throws FormatException;
 
 	PublicKey parseAndValidateAgreementPublicKey(byte[] publicKeyBytes)
-			throws FormatException;
+		throws FormatException;
 
 	TransportProperties parseAndValidateTransportProperties(
 			BdfDictionary properties) throws FormatException;

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactManager.java

@@ -4,10 +4,8 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.crypto.SecretKey;
-import org.briarproject.bramble.api.db.ContactExistsException;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchContactException;
-import org.briarproject.bramble.api.db.PendingContactExistsException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorId;
@@ -119,14 +117,9 @@ public interface ContactManager {
 	 * @throws FormatException If the link is invalid
 	 * @throws GeneralSecurityException If the pending contact's handshake
 	 * public key is invalid
-	 * @throws ContactExistsException If a contact with the same handshake
-	 * public key already exists
-	 * @throws PendingContactExistsException If a pending contact with the same
-	 * handshake public key already exists
 	 */
 	PendingContact addPendingContact(String link, String alias)
-			throws DbException, FormatException, GeneralSecurityException,
-			ContactExistsException, PendingContactExistsException;
+			throws DbException, FormatException, GeneralSecurityException;
 
 	/**
 	 * Returns the pending contact with the given ID.

bramble-api/src/main/java/org/briarproject/bramble/api/contact/PendingContactState.java

@@ -3,7 +3,6 @@ package org.briarproject.bramble.api.contact;
 public enum PendingContactState {
 
 	WAITING_FOR_CONNECTION,
-	OFFLINE,
 	CONNECTING,
 	ADDING_CONTACT,
 	FAILED

bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoComponent.java

@@ -132,32 +132,17 @@ public interface CryptoComponent {
 	 * storage. The encryption and authentication keys are derived from the
 	 * given password. The ciphertext will be decryptable using the same
 	 * password after the app restarts.
-	 *
-	 * @param keyStrengthener Used to strengthen the password-based key. If
-	 * null, the password-based key will not be strengthened
 	 */
-	byte[] encryptWithPassword(byte[] plaintext, String password,
-			@Nullable KeyStrengthener keyStrengthener);
+	byte[] encryptWithPassword(byte[] plaintext, String password);
 
 	/**
 	 * Decrypts and authenticates the given ciphertext that has been read from
 	 * storage. The encryption and authentication keys are derived from the
 	 * given password. Returns null if the ciphertext cannot be decrypted and
 	 * authenticated (for example, if the password is wrong).
-	 *
-	 * @param keyStrengthener Used to strengthen the password-based key. If
-	 * null, or if strengthening was not used when encrypting the ciphertext,
-	 * the password-based key will not be strengthened
 	 */
 	@Nullable
-	byte[] decryptWithPassword(byte[] ciphertext, String password,
-			@Nullable KeyStrengthener keyStrengthener);
-
-	/**
-	 * Returns true if the given ciphertext was encrypted using a strengthened
-	 * key. The validity of the ciphertext is not checked.
-	 */
-	boolean isEncryptedWithStrengthenedKey(byte[] ciphertext);
+	byte[] decryptWithPassword(byte[] ciphertext, String password);
 
 	/**
 	 * Encrypts the given plaintext to the given public key.

bramble-api/src/main/java/org/briarproject/bramble/api/crypto/KeyStrengthener.java

@@ -1,23 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-/**
- * Interface for strengthening a password-based key, for example by using a
- * key stored in a key management service or hardware security module.
- */
-@NotNullByDefault
-public interface KeyStrengthener {
-
-	/**
-	 * Returns true if the strengthener has been initialised.
-	 */
-	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
-	boolean isInitialised();
-
-	/**
-	 * Initialises the strengthener if necessary and returns a strong key
-	 * derived from the given key.
-	 */
-	SecretKey strengthenKey(SecretKey k);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseComponent.java

@@ -29,7 +29,6 @@ import org.briarproject.bramble.api.transport.TransportKeySet;
 import org.briarproject.bramble.api.transport.TransportKeys;
 
 import java.util.Collection;
-import java.util.List;
 import java.util.Map;
 
 import javax.annotation.Nullable;
@@ -78,12 +77,12 @@ public interface DatabaseComponent extends TransactionManager {
 	 * Stores a local message.
 	 */
 	void addLocalMessage(Transaction txn, Message m, Metadata meta,
-			boolean shared, boolean temporary) throws DbException;
+			boolean shared) throws DbException;
 
 	/**
 	 * Stores a pending contact.
 	 */
-	void addPendingContact(Transaction txn, PendingContact p, AuthorId local)
+	void addPendingContact(Transaction txn, PendingContact p)
 			throws DbException;
 
 	/**
@@ -428,13 +427,6 @@ public interface DatabaseComponent extends TransactionManager {
 	 */
 	Settings getSettings(Transaction txn, String namespace) throws DbException;
 
-	/**
-	 * Returns the versions of the sync protocol supported by the given contact.
-	 * <p/>
-	 * Read-only.
-	 */
-	List<Byte> getSyncVersions(Transaction txn, ContactId c) throws DbException;
-
 	/**
 	 * Returns all transport keys for the given transport.
 	 * <p/>
@@ -518,12 +510,6 @@ public interface DatabaseComponent extends TransactionManager {
 	void removePendingContact(Transaction txn, PendingContactId p)
 			throws DbException;
 
-	/**
-	 * Removes all temporary messages (and all associated state) from the
-	 * database.
-	 */
-	void removeTemporaryMessages(Transaction txn) throws DbException;
-
 	/**
 	 * Removes a transport (and all associated state) from the database.
 	 */
@@ -552,11 +538,6 @@ public interface DatabaseComponent extends TransactionManager {
 	void setGroupVisibility(Transaction txn, ContactId c, GroupId g,
 			Visibility v) throws DbException;
 
-	/**
-	 * Marks the given message as permanent, i.e. not temporary.
-	 */
-	void setMessagePermanent(Transaction txn, MessageId m) throws DbException;
-
 	/**
 	 * Marks the given message as shared.
 	 */
@@ -587,12 +568,6 @@ public interface DatabaseComponent extends TransactionManager {
 	void setReorderingWindow(Transaction txn, KeySetId k, TransportId t,
 			long timePeriod, long base, byte[] bitmap) throws DbException;
 
-	/**
-	 * Sets the versions of the sync protocol supported by the given contact.
-	 */
-	void setSyncVersions(Transaction txn, ContactId c, List<Byte> supported)
-			throws DbException;
-
 	/**
 	 * Marks the given transport keys as usable for outgoing streams.
 	 */

bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseConfig.java

@@ -1,29 +1,13 @@
 package org.briarproject.bramble.api.db;
 
-import org.briarproject.bramble.api.crypto.KeyStrengthener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.io.File;
 
-import javax.annotation.Nullable;
-
 @NotNullByDefault
 public interface DatabaseConfig {
 
-	/**
-	 * Returns the directory where the database stores its data.
-	 */
 	File getDatabaseDirectory();
 
-	/**
-	 * Returns the directory where the encrypted database key is stored.
-	 */
 	File getDatabaseKeyDirectory();
-
-	/**
-	 * Returns a {@link KeyStrengthener} for strengthening the encryption of
-	 * the database key, or null if no strengthener should be used.
-	 */
-	@Nullable
-	KeyStrengthener getKeyStrengthener();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/db/PendingContactExistsException.java

@@ -1,21 +1,9 @@
 package org.briarproject.bramble.api.db;
 
-import org.briarproject.bramble.api.contact.PendingContact;
-
 /**
  * Thrown when a duplicate pending contact is added to the database. This
  * exception may occur due to concurrent updates and does not indicate a
  * database error.
  */
 public class PendingContactExistsException extends DbException {
-
-	private final PendingContact pendingContact;
-
-	public PendingContactExistsException(PendingContact pendingContact) {
-		this.pendingContact = pendingContact;
-	}
-
-	public PendingContact getPendingContact() {
-		return pendingContact;
-	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/event/EventBus.java

@@ -18,8 +18,6 @@ public interface EventBus {
 	/**
 	 * Asynchronously notifies all listeners of an event. Listeners are
 	 * notified on the {@link EventExecutor}.
-	 * <p>
-	 * This method can safely be called while holding a lock.
 	 */
 	void broadcast(Event e);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/BluetoothConstants.java

@@ -8,4 +8,6 @@ public interface BluetoothConstants {
 
 	String PROP_ADDRESS = "address";
 	String PROP_UUID = "uuid";
+
+	String PREF_BT_ENABLE = "enable";
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/DiscoveryHandler.java

@@ -1,18 +0,0 @@
-package org.briarproject.bramble.api.plugin;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.properties.TransportProperties;
-
-/**
- * An interface for handling peers discovered by transport plugins.
- */
-@NotNullByDefault
-public interface DiscoveryHandler {
-
-	/**
-	 * Handles a peer discovered by a transport plugin.
-	 *
-	 * @param p A set of properties describing the discovered peer.
-	 */
-	void handleDevice(TransportProperties p);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/LanTcpConstants.java

@@ -4,10 +4,10 @@ public interface LanTcpConstants {
 
 	TransportId ID = new TransportId("org.briarproject.bramble.lan");
 
-	// Transport properties (shared with contacts)
+	// a transport property (shared with contacts)
 	String PROP_IP_PORTS = "ipPorts";
-	String PROP_PORT = "port";
 
-	// A local setting
+	// a local setting
 	String PREF_LAN_IP_PORTS = "ipPorts";
+
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/Plugin.java

@@ -3,55 +3,12 @@ package org.briarproject.bramble.api.plugin;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.properties.TransportProperties;
-import org.briarproject.bramble.api.settings.SettingsManager;
 
-import java.util.List;
+import java.util.Collection;
 
 @NotNullByDefault
 public interface Plugin {
 
-	enum State {
-
-		/**
-		 * The plugin has not finished starting or has been stopped.
-		 */
-		STARTING_STOPPING,
-
-		/**
-		 * The plugin is disabled by settings. Use {@link #getReasonsDisabled()}
-		 * to find out which settings are responsible.
-		 */
-		DISABLED,
-
-		/**
-		 * The plugin is being enabled and can't yet make or receive
-		 * connections.
-		 */
-		ENABLING,
-
-		/**
-		 * The plugin is enabled and can make or receive connections.
-		 */
-		ACTIVE,
-
-		/**
-		 * The plugin is enabled but can't make or receive connections
-		 */
-		INACTIVE
-	}
-
-	/**
-	 * The string for the boolean preference
-	 * to use with the {@link SettingsManager} to enable or disable the plugin.
-	 */
-	String PREF_PLUGIN_ENABLE = "enable";
-
-	/**
-	 * Reason flag returned by {@link #getReasonsDisabled()} to indicate that
-	 * the plugin has been disabled by the user.
-	 */
-	int REASON_USER = 1;
-
 	/**
 	 * Returns the plugin's transport identifier.
 	 */
@@ -78,18 +35,9 @@ public interface Plugin {
 	void stop() throws PluginException;
 
 	/**
-	 * Returns the current state of the plugin.
+	 * Returns true if the plugin is running.
 	 */
-	State getState();
-
-	/**
-	 * Returns a set of flags indicating why the plugin is
-	 * {@link State#DISABLED disabled}, or 0 if the plugin is not disabled.
-	 * <p>
-	 * The flags used are plugin-specific, except the generic flag
-	 * {@link #REASON_USER}, which may be used by any plugin.
-	 */
-	int getReasonsDisabled();
+	boolean isRunning();
 
 	/**
 	 * Returns true if the plugin should be polled periodically to attempt to
@@ -106,5 +54,6 @@ public interface Plugin {
 	 * Attempts to create connections using the given transport properties,
 	 * passing any created connections to the corresponding handlers.
 	 */
-	void poll(List<Pair<TransportProperties, ConnectionHandler>> properties);
+	void poll(Collection<Pair<TransportProperties, ConnectionHandler>>
+			properties);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/PluginCallback.java

@@ -1,10 +1,6 @@
 package org.briarproject.bramble.api.plugin;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportStateEvent;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
 
@@ -36,17 +32,12 @@ public interface PluginCallback extends ConnectionHandler {
 	void mergeLocalProperties(TransportProperties p);
 
 	/**
-	 * Informs the callback of the plugin's current state.
-	 * <p>
-	 * If the current state is different from the previous state, the callback
-	 * will broadcast a {@link TransportStateEvent}. If the current state is
-	 * {@link State#ACTIVE} and the previous state was not
-	 * {@link State#ACTIVE}, the callback will broadcast a
-	 * {@link TransportActiveEvent}. If the current state is not
-	 * {@link State#ACTIVE} and the previous state was {@link State#ACTIVE},
-	 * the callback will broadcast a {@link TransportInactiveEvent}.
-	 * <p>
-	 * This method can safely be called while holding a lock.
+	 * Signals that the transport is enabled.
 	 */
-	void pluginStateChanged(State state);
+	void transportEnabled();
+
+	/**
+	 * Signals that the transport is disabled.
+	 */
+	void transportDisabled();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/PluginManager.java

@@ -41,17 +41,4 @@ public interface PluginManager {
 	 * Returns any duplex plugins that support rendezvous.
 	 */
 	Collection<DuplexPlugin> getRendezvousPlugins();
-
-	/**
-	 * Enables or disables the plugin
-	 * identified by the given {@link TransportId}.
-	 * <p>
-	 * Note that this applies the change asynchronously
-	 * and there are no order guarantees.
-	 * <p>
-	 * If no plugin with the given {@link TransportId} is registered,
-	 * this is a no-op.
-	 */
-	void setPluginEnabled(TransportId t, boolean enabled);
-
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TorConstants.java

@@ -21,21 +21,6 @@ public interface TorConstants {
 	int PREF_TOR_NETWORK_AUTOMATIC = 0;
 	int PREF_TOR_NETWORK_WITHOUT_BRIDGES = 1;
 	int PREF_TOR_NETWORK_WITH_BRIDGES = 2;
-	// TODO: Remove when settings migration code is removed
 	int PREF_TOR_NETWORK_NEVER = 3;
 
-	/**
-	 * Reason flag returned by {@link Plugin#getReasonsDisabled()}.
-	 */
-	int REASON_BATTERY = 2;
-
-	/**
-	 * Reason flag returned by {@link Plugin#getReasonsDisabled()}.
-	 */
-	int REASON_MOBILE_DATA = 4;
-
-	/**
-	 * Reason flag returned by {@link Plugin#getReasonsDisabled()}.
-	 */
-	int REASON_COUNTRY_BLOCKED = 8;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/DuplexPlugin.java

@@ -1,18 +1,14 @@
 package org.briarproject.bramble.api.plugin.duplex;
 
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionHandler;
-import org.briarproject.bramble.api.plugin.DiscoveryHandler;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.rendezvous.KeyMaterialSource;
 import org.briarproject.bramble.api.rendezvous.RendezvousEndpoint;
 
-import java.util.List;
-
 import javax.annotation.Nullable;
 
 /**
@@ -62,16 +58,4 @@ public interface DuplexPlugin extends Plugin {
 	@Nullable
 	RendezvousEndpoint createRendezvousEndpoint(KeyMaterialSource k,
 			boolean alice, ConnectionHandler incoming);
-
-	/**
-	 * Returns true if the plugin supports peer discovery.
-	 */
-	boolean supportsDiscovery();
-
-	/**
-	 * Attempts to discover peers using the given transport properties, passing
-	 * any discovered peers to the corresponding handlers.
-	 */
-	void discoverPeers(List<Pair<TransportProperties, DiscoveryHandler>>
-			properties);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/TransportDisabledEvent.java

@@ -2,22 +2,20 @@ package org.briarproject.bramble.api.plugin.event;
 
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.TransportId;
 
 import javax.annotation.concurrent.Immutable;
 
 /**
- * An event that is broadcast when a plugin enters the {@link State#ACTIVE}
- * state.
+ * An event that is broadcast when a transport is disabled.
  */
 @Immutable
 @NotNullByDefault
-public class TransportActiveEvent extends Event {
+public class TransportDisabledEvent extends Event {
 
 	private final TransportId transportId;
 
-	public TransportActiveEvent(TransportId transportId) {
+	public TransportDisabledEvent(TransportId transportId) {
 		this.transportId = transportId;
 	}
 

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/TransportEnabledEvent.java

@@ -2,22 +2,20 @@ package org.briarproject.bramble.api.plugin.event;
 
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.TransportId;
 
 import javax.annotation.concurrent.Immutable;
 
 /**
- * An event that is broadcast when a plugin leaves the {@link State#ACTIVE}
- * state.
+ * An event that is broadcast when a transport is enabled.
  */
 @Immutable
 @NotNullByDefault
-public class TransportInactiveEvent extends Event {
+public class TransportEnabledEvent extends Event {
 
 	private final TransportId transportId;
 
-	public TransportInactiveEvent(TransportId transportId) {
+	public TransportEnabledEvent(TransportId transportId) {
 		this.transportId = transportId;
 	}
 

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/TransportStateEvent.java

@@ -1,32 +0,0 @@
-package org.briarproject.bramble.api.plugin.event;
-
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
-import org.briarproject.bramble.api.plugin.TransportId;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when the {@link State state} of a plugin changes.
- */
-@Immutable
-@NotNullByDefault
-public class TransportStateEvent extends Event {
-
-	private final TransportId transportId;
-	private final State state;
-
-	public TransportStateEvent(TransportId transportId, State state) {
-		this.transportId = transportId;
-		this.state = state;
-	}
-
-	public TransportId getTransportId() {
-		return transportId;
-	}
-
-	public State getState() {
-		return state;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/sync/Ack.java

@@ -1,16 +1,10 @@
 package org.briarproject.bramble.api.sync;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
 import java.util.Collection;
 
-import javax.annotation.concurrent.Immutable;
-
 /**
  * A record acknowledging receipt of one or more {@link Message Messages}.
  */
-@Immutable
-@NotNullByDefault
 public class Ack {
 
 	private final Collection<MessageId> acked;

bramble-api/src/main/java/org/briarproject/bramble/api/sync/Message.java

@@ -1,14 +1,8 @@
 package org.briarproject.bramble.api.sync;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_BODY_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 
-@Immutable
-@NotNullByDefault
 public class Message {
 
 	/**

bramble-api/src/main/java/org/briarproject/bramble/api/sync/Offer.java

@@ -1,16 +1,10 @@
 package org.briarproject.bramble.api.sync;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
 import java.util.Collection;
 
-import javax.annotation.concurrent.Immutable;
-
 /**
  * A record offering the recipient one or more {@link Message Messages}.
  */
-@Immutable
-@NotNullByDefault
 public class Offer {
 
 	private final Collection<MessageId> offered;

bramble-api/src/main/java/org/briarproject/bramble/api/sync/RecordTypes.java

@@ -9,5 +9,5 @@ public interface RecordTypes {
 	byte MESSAGE = 1;
 	byte OFFER = 2;
 	byte REQUEST = 3;
-	byte VERSIONS = 4;
+
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/Request.java

@@ -1,16 +1,10 @@
 package org.briarproject.bramble.api.sync;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
 import java.util.Collection;
 
-import javax.annotation.concurrent.Immutable;
-
 /**
  * A record requesting one or more {@link Message Messages} from the recipient.
  */
-@Immutable
-@NotNullByDefault
 public class Request {
 
 	private final Collection<MessageId> requested;

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncConstants.java

@@ -2,9 +2,6 @@ package org.briarproject.bramble.api.sync;
 
 import org.briarproject.bramble.api.UniqueId;
 
-import java.util.List;
-
-import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 
 public interface SyncConstants {
@@ -14,11 +11,6 @@ public interface SyncConstants {
 	 */
 	byte PROTOCOL_VERSION = 0;
 
-	/**
-	 * The versions of the sync protocol this peer supports.
-	 */
-	List<Byte> SUPPORTED_VERSIONS = singletonList(PROTOCOL_VERSION);
-
 	/**
 	 * The maximum length of a group descriptor in bytes.
 	 */
@@ -43,10 +35,4 @@ public interface SyncConstants {
 	 * The maximum number of message IDs in an ack, offer or request record.
 	 */
 	int MAX_MESSAGE_IDS = MAX_RECORD_PAYLOAD_BYTES / UniqueId.LENGTH;
-
-	/**
-	 * The maximum number of versions of the sync protocol a peer may support
-	 * simultaneously.
-	 */
-	int MAX_SUPPORTED_VERSIONS = 10;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordReader.java

@@ -25,7 +25,4 @@ public interface SyncRecordReader {
 
 	Request readRequest() throws IOException;
 
-	boolean hasVersions() throws IOException;
-
-	Versions readVersions() throws IOException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordWriter.java

@@ -15,7 +15,5 @@ public interface SyncRecordWriter {
 
 	void writeRequest(Request r) throws IOException;
 
-	void writeVersions(Versions v) throws IOException;
-
 	void flush() throws IOException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/Versions.java

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.api.sync;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.List;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * A record telling the recipient which versions of the sync protocol the
- * sender supports.
- */
-@Immutable
-@NotNullByDefault
-public class Versions {
-
-	private final List<Byte> supported;
-
-	public Versions(List<Byte> supported) {
-		this.supported = supported;
-	}
-
-	public List<Byte> getSupportedVersions() {
-		return supported;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/sync/event/SyncVersionsUpdatedEvent.java

@@ -1,34 +0,0 @@
-package org.briarproject.bramble.api.sync.event;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.List;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when the versions of the sync protocol supported
- * by a contact are updated.
- */
-@Immutable
-@NotNullByDefault
-public class SyncVersionsUpdatedEvent extends Event {
-
-	private final ContactId contactId;
-	private final List<Byte> supported;
-
-	public SyncVersionsUpdatedEvent(ContactId contactId, List<Byte> supported) {
-		this.contactId = contactId;
-		this.supported = supported;
-	}
-
-	public ContactId getContactId() {
-		return contactId;
-	}
-
-	public List<Byte> getSupportedVersions() {
-		return supported;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/versioning/ClientVersion.java

@@ -1,63 +0,0 @@
-package org.briarproject.bramble.api.versioning;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.sync.ClientId;
-
-import javax.annotation.concurrent.Immutable;
-
-@Immutable
-@NotNullByDefault
-public class ClientVersion implements Comparable<ClientVersion> {
-
-	private final ClientMajorVersion majorVersion;
-	private final int minorVersion;
-
-	public ClientVersion(ClientMajorVersion majorVersion,
-			int minorVersion) {
-		this.majorVersion = majorVersion;
-		this.minorVersion = minorVersion;
-	}
-
-	public ClientVersion(ClientId clientId, int majorVersion,
-			int minorVersion) {
-		this(new ClientMajorVersion(clientId, majorVersion), minorVersion);
-	}
-
-	public ClientMajorVersion getClientMajorVersion() {
-		return majorVersion;
-	}
-
-	public ClientId getClientId() {
-		return majorVersion.getClientId();
-	}
-
-	public int getMajorVersion() {
-		return majorVersion.getMajorVersion();
-	}
-
-	public int getMinorVersion() {
-		return minorVersion;
-	}
-
-	@Override
-	public boolean equals(Object o) {
-		if (o instanceof ClientVersion) {
-			ClientVersion cv = (ClientVersion) o;
-			return majorVersion.equals(cv.majorVersion)
-					&& minorVersion == cv.minorVersion;
-		}
-		return false;
-	}
-
-	@Override
-	public int hashCode() {
-		return majorVersion.hashCode();
-	}
-
-	@Override
-	public int compareTo(ClientVersion cv) {
-		int compare = majorVersion.compareTo(cv.majorVersion);
-		if (compare != 0) return compare;
-		return minorVersion - cv.minorVersion;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/versioning/event/ClientVersionUpdatedEvent.java

@@ -1,34 +0,0 @@
-package org.briarproject.bramble.api.versioning.event;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.versioning.ClientVersion;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when we receive a client versioning update from
- * a contact.
- */
-@Immutable
-@NotNullByDefault
-public class ClientVersionUpdatedEvent extends Event {
-
-	private final ContactId contactId;
-	private final ClientVersion clientVersion;
-
-	public ClientVersionUpdatedEvent(ContactId contactId,
-			ClientVersion clientVersion) {
-		this.contactId = contactId;
-		this.clientVersion = clientVersion;
-	}
-
-	public ContactId getContactId() {
-		return contactId;
-	}
-
-	public ClientVersion getClientVersion() {
-		return clientVersion;
-	}
-}

bramble-api/witness.gradle

@@ -2,7 +2,7 @@ dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',

bramble-core/build.gradle

@@ -17,7 +17,7 @@ dependencies {
 	implementation 'org.whispersystems:curve25519-java:0.5.0'
 	implementation 'org.briarproject:jtorctl:0.3'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation 'org.hsqldb:hsqldb:2.3.5' // The last version that supports Java 1.6
@@ -26,7 +26,7 @@ dependencies {
 	testImplementation "org.jmock:jmock-junit4:2.8.2"
 	testImplementation "org.jmock:jmock-legacy:2.8.2"
 
-	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
 
 	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }

bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreEagerSingletons.java

@@ -39,21 +39,18 @@ public interface BrambleCoreEagerSingletons {
 
 	void inject(VersioningModule.EagerSingletons init);
 
-	class Helper {
-
-		public static void injectEagerSingletons(BrambleCoreEagerSingletons c) {
-			c.inject(new ContactModule.EagerSingletons());
-			c.inject(new CryptoExecutorModule.EagerSingletons());
-			c.inject(new DatabaseExecutorModule.EagerSingletons());
-			c.inject(new IdentityModule.EagerSingletons());
-			c.inject(new LifecycleModule.EagerSingletons());
-			c.inject(new RendezvousModule.EagerSingletons());
-			c.inject(new PluginModule.EagerSingletons());
-			c.inject(new PropertiesModule.EagerSingletons());
-			c.inject(new SystemModule.EagerSingletons());
-			c.inject(new TransportModule.EagerSingletons());
-			c.inject(new ValidationModule.EagerSingletons());
-			c.inject(new VersioningModule.EagerSingletons());
-		}
+	default void injectBrambleCoreEagerSingletons() {
+		inject(new ContactModule.EagerSingletons());
+		inject(new CryptoExecutorModule.EagerSingletons());
+		inject(new DatabaseExecutorModule.EagerSingletons());
+		inject(new IdentityModule.EagerSingletons());
+		inject(new LifecycleModule.EagerSingletons());
+		inject(new RendezvousModule.EagerSingletons());
+		inject(new PluginModule.EagerSingletons());
+		inject(new PropertiesModule.EagerSingletons());
+		inject(new SystemModule.EagerSingletons());
+		inject(new TransportModule.EagerSingletons());
+		inject(new ValidationModule.EagerSingletons());
+		inject(new VersioningModule.EagerSingletons());
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java

@@ -50,4 +50,8 @@ import dagger.Module;
 		VersioningModule.class
 })
 public class BrambleCoreModule {
+
+	public static void initEagerSingletons(BrambleCoreEagerSingletons c) {
+		c.injectBrambleCoreEagerSingletons();
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/account/AccountManagerImpl.java

@@ -2,7 +2,6 @@ package org.briarproject.bramble.account;
 
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
-import org.briarproject.bramble.api.crypto.KeyStrengthener;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.identity.Identity;
@@ -20,7 +19,6 @@ import java.io.InputStreamReader;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
@@ -70,10 +68,9 @@ class AccountManagerImpl implements AccountManager {
 		return databaseKey;
 	}
 
-	// Package access for testing
-	@GuardedBy("stateChangeLock")
+	// Locking: stateChangeLock
 	@Nullable
-	String loadEncryptedDatabaseKey() {
+	protected String loadEncryptedDatabaseKey() {
 		String key = readDbKeyFromFile(dbKeyFile);
 		if (key == null) {
 			LOG.info("No database key in primary file");
@@ -86,7 +83,7 @@ class AccountManagerImpl implements AccountManager {
 		return key;
 	}
 
-	@GuardedBy("stateChangeLock")
+	// Locking: stateChangeLock
 	@Nullable
 	private String readDbKeyFromFile(File f) {
 		if (!f.exists()) {
@@ -105,9 +102,8 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	// Package access for testing
-	@GuardedBy("stateChangeLock")
-	boolean storeEncryptedDatabaseKey(String hex) {
+	// Locking: stateChangeLock
+	protected boolean storeEncryptedDatabaseKey(String hex) {
 		LOG.info("Storing database key in file");
 		// Create the directory if necessary
 		if (databaseConfig.getDatabaseKeyDirectory().mkdirs())
@@ -144,7 +140,7 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	@GuardedBy("stateChangeLock")
+	// Locking: stateChangeLock
 	private void writeDbKeyToFile(String key, File f) throws IOException {
 		FileOutputStream out = new FileOutputStream(f);
 		out.write(key.getBytes("UTF-8"));
@@ -174,11 +170,10 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	@GuardedBy("stateChangeLock")
+	// Locking: stateChangeLock
 	private boolean encryptAndStoreDatabaseKey(SecretKey key, String password) {
 		byte[] plaintext = key.getBytes();
-		byte[] ciphertext = crypto.encryptWithPassword(plaintext, password,
-				databaseConfig.getKeyStrengthener());
+		byte[] ciphertext = crypto.encryptWithPassword(plaintext, password);
 		return storeEncryptedDatabaseKey(toHexString(ciphertext));
 	}
 
@@ -202,7 +197,7 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	@GuardedBy("stateChangeLock")
+	// Locking: stateChangeLock
 	@Nullable
 	private SecretKey loadAndDecryptDatabaseKey(String password) {
 		String hex = loadEncryptedDatabaseKey();
@@ -211,22 +206,12 @@ class AccountManagerImpl implements AccountManager {
 			return null;
 		}
 		byte[] ciphertext = fromHexString(hex);
-		KeyStrengthener keyStrengthener = databaseConfig.getKeyStrengthener();
-		byte[] plaintext = crypto.decryptWithPassword(ciphertext, password,
-				keyStrengthener);
+		byte[] plaintext = crypto.decryptWithPassword(ciphertext, password);
 		if (plaintext == null) {
 			LOG.info("Failed to decrypt database key");
 			return null;
 		}
-		SecretKey key = new SecretKey(plaintext);
-		// If the DB key was encrypted with a weak key and a key strengthener
-		// is now available, re-encrypt the DB key with a strengthened key
-		if (keyStrengthener != null &&
-				!crypto.isEncryptedWithStrengthenedKey(ciphertext)) {
-			LOG.info("Re-encrypting database key with strengthened key");
-			encryptAndStoreDatabaseKey(key, password);
-		}
-		return key;
+		return new SecretKey(plaintext);
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java

@@ -85,21 +85,14 @@ class ClientHelperImpl implements ClientHelper {
 	@Override
 	public void addLocalMessage(Message m, BdfDictionary metadata,
 			boolean shared) throws DbException, FormatException {
-		db.transaction(false, txn -> addLocalMessage(txn, m, metadata, shared,
-				false));
+		db.transaction(false, txn -> addLocalMessage(txn, m, metadata, shared));
 	}
 
 	@Override
 	public void addLocalMessage(Transaction txn, Message m,
-			BdfDictionary metadata, boolean shared, boolean temporary)
+			BdfDictionary metadata, boolean shared)
 			throws DbException, FormatException {
-		db.addLocalMessage(txn, m, metadataEncoder.encode(metadata), shared,
-				temporary);
-	}
-
-	@Override
-	public Message createMessage(GroupId g, long timestamp, byte[] body) {
-		return messageFactory.createMessage(g, timestamp, body);
+		db.addLocalMessage(txn, m, metadataEncoder.encode(metadata), shared);
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/contact/ContactManagerImpl.java

@@ -139,8 +139,7 @@ class ContactManagerImpl implements ContactManager, EventListener {
 				pendingContactFactory.createPendingContact(link, alias);
 		Transaction txn = db.startTransaction(false);
 		try {
-			AuthorId local = identityManager.getLocalAuthor(txn).getId();
-			db.addPendingContact(txn, p, local);
+			db.addPendingContact(txn, p);
 			KeyPair ourKeyPair = identityManager.getHandshakeKeys(txn);
 			keyManager.addPendingContact(txn, p.getId(), p.getPublicKey(),
 					ourKeyPair);
@@ -148,6 +147,7 @@ class ContactManagerImpl implements ContactManager, EventListener {
 		} finally {
 			db.endTransaction(txn);
 		}
+		states.put(p.getId(), WAITING_FOR_CONNECTION);
 		return p;
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoComponentImpl.java

@@ -9,7 +9,6 @@ import org.briarproject.bramble.api.crypto.AgreementPublicKey;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.crypto.KeyPair;
 import org.briarproject.bramble.api.crypto.KeyParser;
-import org.briarproject.bramble.api.crypto.KeyStrengthener;
 import org.briarproject.bramble.api.crypto.PrivateKey;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.crypto.SecretKey;
@@ -52,8 +51,7 @@ class CryptoComponentImpl implements CryptoComponent {
 	private static final int SIGNATURE_KEY_PAIR_BITS = 256;
 	private static final int STORAGE_IV_BYTES = 24; // 196 bits
 	private static final int PBKDF_SALT_BYTES = 32; // 256 bits
-	private static final byte PBKDF_FORMAT_SCRYPT = 0;
-	private static final byte PBKDF_FORMAT_SCRYPT_STRENGTHENED = 1;
+	private static final int PBKDF_FORMAT_SCRYPT = 0;
 
 	private final SecureRandom secureRandom;
 	private final PasswordBasedKdf passwordBasedKdf;
@@ -313,8 +311,7 @@ class CryptoComponentImpl implements CryptoComponent {
 	}
 
 	@Override
-	public byte[] encryptWithPassword(byte[] input, String password,
-			@Nullable KeyStrengthener keyStrengthener) {
+	public byte[] encryptWithPassword(byte[] input, String password) {
 		AuthenticatedCipher cipher = new XSalsa20Poly1305AuthenticatedCipher();
 		int macBytes = cipher.getMacBytes();
 		// Generate a random salt
@@ -322,9 +319,8 @@ class CryptoComponentImpl implements CryptoComponent {
 		secureRandom.nextBytes(salt);
 		// Calibrate the KDF
 		int cost = passwordBasedKdf.chooseCostParameter();
-		// Derive the encryption key from the password
+		// Derive the key from the password
 		SecretKey key = passwordBasedKdf.deriveKey(password, salt, cost);
-		if (keyStrengthener != null) key = keyStrengthener.strengthenKey(key);
 		// Generate a random IV
 		byte[] iv = new byte[STORAGE_IV_BYTES];
 		secureRandom.nextBytes(iv);
@@ -335,9 +331,7 @@ class CryptoComponentImpl implements CryptoComponent {
 		byte[] output = new byte[outputLen];
 		int outputOff = 0;
 		// Format version
-		byte formatVersion = keyStrengthener == null
-				? PBKDF_FORMAT_SCRYPT : PBKDF_FORMAT_SCRYPT_STRENGTHENED;
-		output[outputOff] = formatVersion;
+		output[outputOff] = PBKDF_FORMAT_SCRYPT;
 		outputOff++;
 		// Salt
 		arraycopy(salt, 0, output, outputOff, salt.length);
@@ -360,8 +354,7 @@ class CryptoComponentImpl implements CryptoComponent {
 
 	@Override
 	@Nullable
-	public byte[] decryptWithPassword(byte[] input, String password,
-			@Nullable KeyStrengthener keyStrengthener) {
+	public byte[] decryptWithPassword(byte[] input, String password) {
 		AuthenticatedCipher cipher = new XSalsa20Poly1305AuthenticatedCipher();
 		int macBytes = cipher.getMacBytes();
 		// The input contains the format version, salt, cost parameter, IV,
@@ -373,11 +366,8 @@ class CryptoComponentImpl implements CryptoComponent {
 		// Format version
 		byte formatVersion = input[inputOff];
 		inputOff++;
-		// Check whether we support this format version
-		if (formatVersion != PBKDF_FORMAT_SCRYPT &&
-				formatVersion != PBKDF_FORMAT_SCRYPT_STRENGTHENED) {
-			return null;
-		}
+		if (formatVersion != PBKDF_FORMAT_SCRYPT)
+			return null; // Unknown format
 		// Salt
 		byte[] salt = new byte[PBKDF_SALT_BYTES];
 		arraycopy(input, inputOff, salt, 0, salt.length);
@@ -391,13 +381,8 @@ class CryptoComponentImpl implements CryptoComponent {
 		byte[] iv = new byte[STORAGE_IV_BYTES];
 		arraycopy(input, inputOff, iv, 0, iv.length);
 		inputOff += iv.length;
-		// Derive the decryption key from the password
+		// Derive the key from the password
 		SecretKey key = passwordBasedKdf.deriveKey(password, salt, (int) cost);
-		if (formatVersion == PBKDF_FORMAT_SCRYPT_STRENGTHENED) {
-			if (keyStrengthener == null || !keyStrengthener.isInitialised())
-				return null; // Can't derive the same strengthened key
-			key = keyStrengthener.strengthenKey(key);
-		}
 		// Initialise the cipher
 		try {
 			cipher.init(false, key, iv);
@@ -415,12 +400,6 @@ class CryptoComponentImpl implements CryptoComponent {
 		}
 	}
 
-	@Override
-	public boolean isEncryptedWithStrengthenedKey(byte[] ciphertext) {
-		return ciphertext.length > 0 &&
-				ciphertext[0] == PBKDF_FORMAT_SCRYPT_STRENGTHENED;
-	}
-
 	@Override
 	public byte[] encryptToKey(PublicKey publicKey, byte[] plaintext) {
 		try {

bramble-core/src/main/java/org/briarproject/bramble/db/Database.java

@@ -33,7 +33,6 @@ import org.briarproject.bramble.api.transport.TransportKeySet;
 import org.briarproject.bramble.api.transport.TransportKeys;
 
 import java.util.Collection;
-import java.util.List;
 import java.util.Map;
 
 import javax.annotation.Nullable;
@@ -116,7 +115,7 @@ interface Database<T> {
 	 * if the message was created locally.
 	 */
 	void addMessage(T txn, Message m, MessageState state, boolean shared,
-			boolean temporary, @Nullable ContactId sender) throws DbException;
+			@Nullable ContactId sender) throws DbException;
 
 	/**
 	 * Adds a dependency between two messages, where the dependent message is
@@ -267,16 +266,6 @@ interface Database<T> {
 	 */
 	Collection<ContactId> getContacts(T txn, AuthorId local) throws DbException;
 
-	/**
-	 * Returns the contact with the given {@code handshakePublicKey}
-	 * for the given local pseudonym or {@code null} if none exists.
-	 * <p/>
-	 * Read-only.
-	 */
-	@Nullable
-	Contact getContact(T txn, PublicKey handshakePublicKey, AuthorId local)
-			throws DbException;
-
 	/**
 	 * Returns the group with the given ID.
 	 * <p/>
@@ -539,13 +528,6 @@ interface Database<T> {
 	 */
 	Settings getSettings(T txn, String namespace) throws DbException;
 
-	/**
-	 * Returns the versions of the sync protocol supported by the given contact.
-	 * <p/>
-	 * Read-only.
-	 */
-	List<Byte> getSyncVersions(T txn, ContactId c) throws DbException;
-
 	/**
 	 * Returns all transport keys for the given transport.
 	 * <p/>
@@ -648,12 +630,6 @@ interface Database<T> {
 	 */
 	void removePendingContact(T txn, PendingContactId p) throws DbException;
 
-	/**
-	 * Removes all temporary messages (and all associated state) from the
-	 * database.
-	 */
-	void removeTemporaryMessages(T txn) throws DbException;
-
 	/**
 	 * Removes a transport (and all associated state) from the database.
 	 */
@@ -695,11 +671,6 @@ interface Database<T> {
 	void setHandshakeKeyPair(T txn, AuthorId local, PublicKey publicKey,
 			PrivateKey privateKey) throws DbException;
 
-	/**
-	 * Marks the given message as permanent, i.e. not temporary.
-	 */
-	void setMessagePermanent(T txn, MessageId m) throws DbException;
-
 	/**
 	 * Marks the given message as shared.
 	 */
@@ -718,12 +689,6 @@ interface Database<T> {
 	void setReorderingWindow(T txn, KeySetId k, TransportId t,
 			long timePeriod, long base, byte[] bitmap) throws DbException;
 
-	/**
-	 * Sets the versions of the sync protocol supported by the given contact.
-	 */
-	void setSyncVersions(T txn, ContactId c, List<Byte> supported)
-			throws DbException;
-
 	/**
 	 * Marks the given transport keys as usable for outgoing streams.
 	 */

bramble-core/src/main/java/org/briarproject/bramble/db/DatabaseComponentImpl.java

@@ -65,7 +65,6 @@ import org.briarproject.bramble.api.sync.event.MessageToAckEvent;
 import org.briarproject.bramble.api.sync.event.MessageToRequestEvent;
 import org.briarproject.bramble.api.sync.event.MessagesAckedEvent;
 import org.briarproject.bramble.api.sync.event.MessagesSentEvent;
-import org.briarproject.bramble.api.sync.event.SyncVersionsUpdatedEvent;
 import org.briarproject.bramble.api.sync.validation.MessageState;
 import org.briarproject.bramble.api.transport.KeySetId;
 import org.briarproject.bramble.api.transport.TransportKeySet;
@@ -274,14 +273,13 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 
 	@Override
 	public void addLocalMessage(Transaction transaction, Message m,
-			Metadata meta, boolean shared, boolean temporary)
-			throws DbException {
+			Metadata meta, boolean shared) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsGroup(txn, m.getGroupId()))
 			throw new NoSuchGroupException();
 		if (!db.containsMessage(txn, m.getId())) {
-			db.addMessage(txn, m, DELIVERED, shared, temporary, null);
+			db.addMessage(txn, m, DELIVERED, shared, null);
 			transaction.attach(new MessageAddedEvent(m, null));
 			transaction.attach(new MessageStateChangedEvent(m.getId(), true,
 					DELIVERED));
@@ -291,17 +289,12 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 	}
 
 	@Override
-	public void addPendingContact(Transaction transaction, PendingContact p,
-			AuthorId local) throws DbException {
+	public void addPendingContact(Transaction transaction, PendingContact p)
+			throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
-		Contact contact = db.getContact(txn, p.getPublicKey(), local);
-		if (contact != null)
-			throw new ContactExistsException(local, contact.getAuthor());
-		if (db.containsPendingContact(txn, p.getId())) {
-			PendingContact existing = db.getPendingContact(txn, p.getId());
-			throw new PendingContactExistsException(existing);
-		}
+		if (db.containsPendingContact(txn, p.getId()))
+			throw new PendingContactExistsException();
 		db.addPendingContact(txn, p);
 		transaction.attach(new PendingContactAddedEvent(p));
 	}
@@ -722,15 +715,6 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		return db.getSettings(txn, namespace);
 	}
 
-	@Override
-	public List<Byte> getSyncVersions(Transaction transaction, ContactId c)
-			throws DbException {
-		T txn = unbox(transaction);
-		if (!db.containsContact(txn, c))
-			throw new NoSuchContactException();
-		return db.getSyncVersions(txn, c);
-	}
-
 	@Override
 	public Collection<TransportKeySet> getTransportKeys(Transaction transaction,
 			TransportId t) throws DbException {
@@ -816,7 +800,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 				db.raiseSeenFlag(txn, c, m.getId());
 				db.raiseAckFlag(txn, c, m.getId());
 			} else {
-				db.addMessage(txn, m, UNKNOWN, false, false, c);
+				db.addMessage(txn, m, UNKNOWN, false, c);
 				transaction.attach(new MessageAddedEvent(m, c));
 			}
 			transaction.attach(new MessageToAckEvent(c));
@@ -924,14 +908,6 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		transaction.attach(new PendingContactRemovedEvent(p));
 	}
 
-	@Override
-	public void removeTemporaryMessages(Transaction transaction)
-			throws DbException {
-		if (transaction.isReadOnly()) throw new IllegalArgumentException();
-		T txn = unbox(transaction);
-		db.removeTemporaryMessages(txn);
-	}
-
 	@Override
 	public void removeTransport(Transaction transaction, TransportId t)
 			throws DbException {
@@ -991,16 +967,6 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		transaction.attach(new GroupVisibilityUpdatedEvent(affected));
 	}
 
-	@Override
-	public void setMessagePermanent(Transaction transaction, MessageId m)
-			throws DbException {
-		if (transaction.isReadOnly()) throw new IllegalArgumentException();
-		T txn = unbox(transaction);
-		if (!db.containsMessage(txn, m))
-			throw new NoSuchMessageException();
-		db.setMessagePermanent(txn, m);
-	}
-
 	@Override
 	public void setMessageShared(Transaction transaction, MessageId m)
 			throws DbException {
@@ -1009,7 +975,8 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		if (!db.containsMessage(txn, m))
 			throw new NoSuchMessageException();
 		if (db.getMessageState(txn, m) != DELIVERED)
-			throw new IllegalArgumentException("Shared undelivered message");
+			throw new IllegalArgumentException(
+					"Shared undelivered message");
 		db.setMessageShared(txn, m);
 		transaction.attach(new MessageSharedEvent(m));
 	}
@@ -1061,17 +1028,6 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		db.setReorderingWindow(txn, k, t, timePeriod, base, bitmap);
 	}
 
-	@Override
-	public void setSyncVersions(Transaction transaction, ContactId c,
-			List<Byte> supported) throws DbException {
-		if (transaction.isReadOnly()) throw new IllegalArgumentException();
-		T txn = unbox(transaction);
-		if (!db.containsContact(txn, c))
-			throw new NoSuchContactException();
-		db.setSyncVersions(txn, c, supported);
-		transaction.attach(new SyncVersionsUpdatedEvent(c, supported));
-	}
-
 	@Override
 	public void setTransportKeysActive(Transaction transaction, TransportId t,
 			KeySetId k) throws DbException {

bramble-core/src/main/java/org/briarproject/bramble/db/JdbcDatabase.java

@@ -62,7 +62,6 @@ import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
 
 import static java.sql.Types.BINARY;
 import static java.sql.Types.BOOLEAN;
@@ -98,7 +97,7 @@ import static org.briarproject.bramble.util.LogUtils.now;
 abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
-	static final int CODE_SCHEMA_VERSION = 47;
+	static final int CODE_SCHEMA_VERSION = 45;
 
 	// Time period offsets for incoming transport keys
 	private static final int OFFSET_PREV = -1;
@@ -135,7 +134,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " handshakePublicKey _BINARY," // Null if key is unknown
 					+ " localAuthorId _HASH NOT NULL,"
 					+ " verified BOOLEAN NOT NULL,"
-					+ " syncVersions _BINARY DEFAULT '00' NOT NULL,"
 					+ " PRIMARY KEY (contactId),"
 					+ " FOREIGN KEY (localAuthorId)"
 					+ " REFERENCES localAuthors (authorId)"
@@ -179,7 +177,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " timestamp BIGINT NOT NULL,"
 					+ " state INT NOT NULL,"
 					+ " shared BOOLEAN NOT NULL,"
-					+ " temporary BOOLEAN NOT NULL,"
 					+ " length INT NOT NULL,"
 					+ " raw BLOB," // Null if message has been deleted
 					+ " PRIMARY KEY (messageId),"
@@ -339,26 +336,25 @@ abstract class JdbcDatabase implements Database<Connection> {
 	private static final Logger LOG =
 			getLogger(JdbcDatabase.class.getName());
 
+	// Different database libraries use different names for certain types
 	private final MessageFactory messageFactory;
 	private final Clock clock;
 	private final DatabaseTypes dbTypes;
 
-	private final Lock connectionsLock = new ReentrantLock();
-	private final Condition connectionsChanged = connectionsLock.newCondition();
-
-	@GuardedBy("connectionsLock")
+	// Locking: connectionsLock
 	private final LinkedList<Connection> connections = new LinkedList<>();
 
-	@GuardedBy("connectionsLock")
-	private int openConnections = 0;
-	@GuardedBy("connectionsLock")
-	private boolean closed = false;
+	private int openConnections = 0; // Locking: connectionsLock
+	private boolean closed = false; // Locking: connectionsLock
 
 	protected abstract Connection createConnection()
 			throws DbException, SQLException;
 
 	protected abstract void compactAndClose() throws DbException;
 
+	private final Lock connectionsLock = new ReentrantLock();
+	private final Condition connectionsChanged = connectionsLock.newCondition();
+
 	JdbcDatabase(DatabaseTypes databaseTypes, MessageFactory messageFactory,
 			Clock clock) {
 		this.dbTypes = databaseTypes;
@@ -461,9 +457,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 				new Migration41_42(dbTypes),
 				new Migration42_43(dbTypes),
 				new Migration43_44(dbTypes),
-				new Migration44_45(),
-				new Migration45_46(),
-				new Migration46_47(dbTypes)
+				new Migration44_45()
 		);
 	}
 
@@ -783,23 +777,22 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public void addMessage(Connection txn, Message m, MessageState state,
-			boolean shared, boolean temporary, @Nullable ContactId sender)
+			boolean messageShared, @Nullable ContactId sender)
 			throws DbException {
 		PreparedStatement ps = null;
 		try {
 			String sql = "INSERT INTO messages (messageId, groupId, timestamp,"
-					+ " state, shared, temporary, length, raw)"
-					+ " VALUES (?, ?, ?, ?, ?, ?, ?, ?)";
+					+ " state, shared, length, raw)"
+					+ " VALUES (?, ?, ?, ?, ?, ?, ?)";
 			ps = txn.prepareStatement(sql);
 			ps.setBytes(1, m.getId().getBytes());
 			ps.setBytes(2, m.getGroupId().getBytes());
 			ps.setLong(3, m.getTimestamp());
 			ps.setInt(4, state.getValue());
-			ps.setBoolean(5, shared);
-			ps.setBoolean(6, temporary);
+			ps.setBoolean(5, messageShared);
 			byte[] raw = messageFactory.getRawMessage(m);
-			ps.setInt(7, raw.length);
-			ps.setBytes(8, raw);
+			ps.setInt(6, raw.length);
+			ps.setBytes(7, raw);
 			int affected = ps.executeUpdate();
 			if (affected != 1) throw new DbStateException();
 			ps.close();
@@ -811,7 +804,8 @@ abstract class JdbcDatabase implements Database<Connection> {
 				boolean offered = removeOfferedMessage(txn, c, m.getId());
 				boolean seen = offered || c.equals(sender);
 				addStatus(txn, m.getId(), c, m.getGroupId(), m.getTimestamp(),
-						raw.length, state, e.getValue(), shared, false, seen);
+						raw.length, state, e.getValue(), messageShared,
+						false, seen);
 			}
 			// Update denormalised column in messageDependencies if dependency
 			// is in same group as dependent
@@ -1465,47 +1459,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
-	@Nullable
-	@Override
-	public Contact getContact(Connection txn, PublicKey handshakePublicKey,
-			AuthorId localAuthorId) throws DbException {
-		PreparedStatement ps = null;
-		ResultSet rs = null;
-		try {
-			String sql = "SELECT contactId, authorId, formatVersion, name,"
-					+ " alias, publicKey, verified"
-					+ " FROM contacts"
-					+ " WHERE handshakePublicKey = ? AND localAuthorId = ?";
-			ps = txn.prepareStatement(sql);
-			ps.setBytes(1, handshakePublicKey.getEncoded());
-			ps.setBytes(2, localAuthorId.getBytes());
-			rs = ps.executeQuery();
-			if (!rs.next()) {
-				rs.close();
-				ps.close();
-				return null;
-			}
-			ContactId contactId = new ContactId(rs.getInt(1));
-			AuthorId authorId = new AuthorId(rs.getBytes(2));
-			int formatVersion = rs.getInt(3);
-			String name = rs.getString(4);
-			String alias = rs.getString(5);
-			PublicKey publicKey = new SignaturePublicKey(rs.getBytes(6));
-			boolean verified = rs.getBoolean(7);
-			if (rs.next()) throw new DbStateException();
-			rs.close();
-			ps.close();
-			Author author =
-					new Author(authorId, formatVersion, name, publicKey);
-			return new Contact(contactId, author, localAuthorId, alias,
-					handshakePublicKey, verified);
-		} catch (SQLException e) {
-			tryToClose(rs, LOG, WARNING);
-			tryToClose(ps, LOG, WARNING);
-			throw new DbException(e);
-		}
-	}
-
 	@Override
 	public Group getGroup(Connection txn, GroupId g) throws DbException {
 		PreparedStatement ps = null;
@@ -2371,32 +2324,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
-	@Override
-	public List<Byte> getSyncVersions(Connection txn, ContactId c)
-			throws DbException {
-		PreparedStatement ps = null;
-		ResultSet rs = null;
-		try {
-			String sql = "SELECT syncVersions FROM contacts"
-					+ " WHERE contactId = ?";
-			ps = txn.prepareStatement(sql);
-			ps.setInt(1, c.getInt());
-			rs = ps.executeQuery();
-			if (!rs.next()) throw new DbStateException();
-			byte[] bytes = rs.getBytes(1);
-			List<Byte> supported = new ArrayList<>(bytes.length);
-			for (byte b : bytes) supported.add(b);
-			if (rs.next()) throw new DbStateException();
-			rs.close();
-			ps.close();
-			return supported;
-		} catch (SQLException e) {
-			tryToClose(rs, LOG, WARNING);
-			tryToClose(ps, LOG, WARNING);
-			throw new DbException(e);
-		}
-	}
-
 	@Override
 	public Collection<TransportKeySet> getTransportKeys(Connection txn,
 			TransportId t) throws DbException {
@@ -2949,21 +2876,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
-	@Override
-	public void removeTemporaryMessages(Connection txn) throws DbException {
-		Statement s = null;
-		try {
-			String sql = "DELETE FROM messages WHERE temporary = TRUE";
-			s = txn.createStatement();
-			int affected = s.executeUpdate(sql);
-			if (affected < 0) throw new DbStateException();
-			s.close();
-		} catch (SQLException e) {
-			tryToClose(s, LOG, WARNING);
-			throw new DbException(e);
-		}
-	}
-
 	@Override
 	public void removeTransport(Connection txn, TransportId t)
 			throws DbException {
@@ -3109,24 +3021,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
-	@Override
-	public void setMessagePermanent(Connection txn, MessageId m)
-			throws DbException {
-		PreparedStatement ps = null;
-		try {
-			String sql = "UPDATE messages SET temporary = FALSE"
-					+ " WHERE messageId = ?";
-			ps = txn.prepareStatement(sql);
-			ps.setBytes(1, m.getBytes());
-			int affected = ps.executeUpdate();
-			if (affected < 0 || affected > 1) throw new DbStateException();
-			ps.close();
-		} catch (SQLException e) {
-			tryToClose(ps, LOG, WARNING);
-			throw new DbException(e);
-		}
-	}
-
 	@Override
 	public void setMessageShared(Connection txn, MessageId m)
 			throws DbException {
@@ -3230,29 +3124,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
-	@Override
-	public void setSyncVersions(Connection txn, ContactId c,
-			List<Byte> supported) throws DbException {
-		PreparedStatement ps = null;
-		try {
-			String sql = "UPDATE contacts SET syncVersions = ?"
-					+ " WHERE contactId = ?";
-			ps = txn.prepareStatement(sql);
-			byte[] bytes = new byte[supported.size()];
-			for (int i = 0; i < bytes.length; i++) {
-				bytes[i] = supported.get(i);
-			}
-			ps.setBytes(1, bytes);
-			ps.setInt(2, c.getInt());
-			int affected = ps.executeUpdate();
-			if (affected < 0 || affected > 1) throw new DbStateException();
-			ps.close();
-		} catch (SQLException e) {
-			tryToClose(ps, LOG, WARNING);
-			throw new DbException(e);
-		}
-	}
-
 	@Override
 	public void setTransportKeysActive(Connection txn, TransportId t,
 			KeySetId k) throws DbException {

bramble-core/src/main/java/org/briarproject/bramble/db/Migration45_46.java

@@ -1,40 +0,0 @@
-package org.briarproject.bramble.db;
-
-import org.briarproject.bramble.api.db.DbException;
-
-import java.sql.Connection;
-import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.logging.Logger;
-
-import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.db.JdbcUtils.tryToClose;
-
-class Migration45_46 implements Migration<Connection> {
-
-	private static final Logger LOG = getLogger(Migration45_46.class.getName());
-
-	@Override
-	public int getStartVersion() {
-		return 45;
-	}
-
-	@Override
-	public int getEndVersion() {
-		return 46;
-	}
-
-	@Override
-	public void migrate(Connection txn) throws DbException {
-		Statement s = null;
-		try {
-			s = txn.createStatement();
-			s.execute("ALTER TABLE messages"
-					+ " ADD COLUMN temporary BOOLEAN DEFAULT FALSE NOT NULL");
-		} catch (SQLException e) {
-			tryToClose(s, LOG, WARNING);
-			throw new DbException(e);
-		}
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/db/Migration46_47.java

@@ -1,47 +0,0 @@
-package org.briarproject.bramble.db;
-
-import org.briarproject.bramble.api.db.DbException;
-
-import java.sql.Connection;
-import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.logging.Logger;
-
-import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.db.JdbcUtils.tryToClose;
-
-class Migration46_47 implements Migration<Connection> {
-
-	private static final Logger LOG = getLogger(Migration46_47.class.getName());
-
-	private final DatabaseTypes dbTypes;
-
-	Migration46_47(DatabaseTypes dbTypes) {
-		this.dbTypes = dbTypes;
-	}
-
-	@Override
-	public int getStartVersion() {
-		return 46;
-	}
-
-	@Override
-	public int getEndVersion() {
-		return 47;
-	}
-
-	@Override
-	public void migrate(Connection txn) throws DbException {
-		Statement s = null;
-		try {
-			s = txn.createStatement();
-			s.execute(dbTypes.replaceTypes("ALTER TABLE contacts"
-					+ " ADD COLUMN syncVersions"
-					+ " _BINARY DEFAULT '00' NOT NULL"));
-		} catch (SQLException e) {
-			tryToClose(s, LOG, WARNING);
-			throw new DbException(e);
-		}
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/lifecycle/LifecycleManagerImpl.java

@@ -107,11 +107,8 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			else logDuration(LOG, "Creating database", start);
 
 			db.transaction(false, txn -> {
-				long start1 = now();
-				db.removeTemporaryMessages(txn);
-				logDuration(LOG, "Removing temporary messages", start1);
 				for (OpenDatabaseHook hook : openDatabaseHooks) {
-					start1 = now();
+					long start1 = now();
 					hook.onDatabaseOpened(txn);
 					if (LOG.isLoggable(FINE)) {
 						logDuration(LOG, "Calling open database hook "

bramble-core/src/main/java/org/briarproject/bramble/plugin/PluginManagerImpl.java

@@ -8,7 +8,6 @@ import org.briarproject.bramble.api.lifecycle.ServiceException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionManager;
 import org.briarproject.bramble.api.plugin.Plugin;
-import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.PluginConfig;
 import org.briarproject.bramble.api.plugin.PluginException;
@@ -19,9 +18,8 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportStateEvent;
+import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.properties.TransportProperties;
@@ -38,7 +36,6 @@ import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.concurrent.atomic.AtomicReference;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.ThreadSafe;
@@ -48,9 +45,6 @@ import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.plugin.Plugin.PREF_PLUGIN_ENABLE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.STARTING_STOPPING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
@@ -183,26 +177,6 @@ class PluginManagerImpl implements PluginManager, Service {
 		return supported;
 	}
 
-	@Override
-	public void setPluginEnabled(TransportId t, boolean enabled) {
-		Plugin plugin = plugins.get(t);
-		if (plugin == null) return;
-
-		Settings s = new Settings();
-		s.putBoolean(PREF_PLUGIN_ENABLE, enabled);
-		ioExecutor.execute(() -> mergeSettings(s, t.getString()));
-	}
-
-	private void mergeSettings(Settings s, String namespace) {
-		try {
-			long start = now();
-			settingsManager.mergeSettings(s, namespace);
-			logDuration(LOG, "Merging settings", start);
-		} catch (DbException e) {
-			logException(LOG, WARNING, e);
-		}
-	}
-
 	private class PluginStarter implements Runnable {
 
 		private final Plugin plugin;
@@ -276,8 +250,7 @@ class PluginManagerImpl implements PluginManager, Service {
 	private class Callback implements PluginCallback {
 
 		private final TransportId id;
-		private final AtomicReference<State> state =
-				new AtomicReference<>(STARTING_STOPPING);
+		private final AtomicBoolean enabled = new AtomicBoolean(false);
 
 		private Callback(TransportId id) {
 			this.id = id;
@@ -305,7 +278,11 @@ class PluginManagerImpl implements PluginManager, Service {
 
 		@Override
 		public void mergeSettings(Settings s) {
-			PluginManagerImpl.this.mergeSettings(s, id.getString());
+			try {
+				settingsManager.mergeSettings(s, id.getString());
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+			}
 		}
 
 		@Override
@@ -318,20 +295,15 @@ class PluginManagerImpl implements PluginManager, Service {
 		}
 
 		@Override
-		public void pluginStateChanged(State newState) {
-			State oldState = state.getAndSet(newState);
-			if (newState != oldState) {
-				if (LOG.isLoggable(INFO)) {
-					LOG.info(id + " changed from state " + oldState
-							+ " to " + newState);
-				}
-				eventBus.broadcast(new TransportStateEvent(id, newState));
-				if (newState == ACTIVE) {
-					eventBus.broadcast(new TransportActiveEvent(id));
-				} else if (oldState == ACTIVE) {
-					eventBus.broadcast(new TransportInactiveEvent(id));
-				}
-			}
+		public void transportEnabled() {
+			if (!enabled.getAndSet(true))
+				eventBus.broadcast(new TransportEnabledEvent(id));
+		}
+
+		@Override
+		public void transportDisabled() {
+			if (enabled.getAndSet(false))
+				eventBus.broadcast(new TransportDisabledEvent(id));
 		}
 
 		@Override

bramble-core/src/main/java/org/briarproject/bramble/plugin/PollerImpl.java

@@ -11,7 +11,6 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionHandler;
 import org.briarproject.bramble.api.plugin.ConnectionManager;
 import org.briarproject.bramble.api.plugin.ConnectionRegistry;
-import org.briarproject.bramble.api.plugin.DiscoveryHandler;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.PluginManager;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
@@ -21,8 +20,8 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
 import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
@@ -33,7 +32,6 @@ import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.concurrent.Executor;
@@ -108,13 +106,13 @@ class PollerImpl implements Poller, EventListener {
 			ConnectionOpenedEvent c = (ConnectionOpenedEvent) e;
 			// Reschedule polling, the polling interval may have decreased
 			reschedule(c.getTransportId());
-		} else if (e instanceof TransportActiveEvent) {
-			TransportActiveEvent t = (TransportActiveEvent) e;
-			// Poll the newly activated transport
+		} else if (e instanceof TransportEnabledEvent) {
+			TransportEnabledEvent t = (TransportEnabledEvent) e;
+			// Poll the newly enabled transport
 			pollNow(t.getTransportId());
-		} else if (e instanceof TransportInactiveEvent) {
-			TransportInactiveEvent t = (TransportInactiveEvent) e;
-			// Cancel polling for the deactivated transport
+		} else if (e instanceof TransportDisabledEvent) {
+			TransportDisabledEvent t = (TransportDisabledEvent) e;
+			// Cancel polling for the disabled transport
 			cancel(t.getTransportId());
 		}
 	}
@@ -212,20 +210,18 @@ class PollerImpl implements Poller, EventListener {
 	@IoExecutor
 	private void poll(Plugin p) {
 		TransportId t = p.getId();
-		if (LOG.isLoggable(INFO)) LOG.info("Polling " + t);
+		if (LOG.isLoggable(INFO)) LOG.info("Polling plugin " + t);
 		try {
 			Map<ContactId, TransportProperties> remote =
 					transportPropertyManager.getRemoteProperties(t);
 			Collection<ContactId> connected =
 					connectionRegistry.getConnectedContacts(t);
-			List<Pair<TransportProperties, ConnectionHandler>> properties =
-					new ArrayList<>();
+			Collection<Pair<TransportProperties, ConnectionHandler>>
+					properties = new ArrayList<>();
 			for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
 				ContactId c = e.getKey();
-				if (!connected.contains(c)) {
-					ConnHandler handler = new ConnHandler(c, t);
-					properties.add(new Pair<>(e.getValue(), handler));
-				}
+				if (!connected.contains(c))
+					properties.add(new Pair<>(e.getValue(), new Handler(c, t)));
 			}
 			if (!properties.isEmpty()) p.poll(properties);
 		} catch (DbException e) {
@@ -233,30 +229,6 @@ class PollerImpl implements Poller, EventListener {
 		}
 	}
 
-	@IoExecutor
-	private void discover(DuplexPlugin p) {
-		TransportId t = p.getId();
-		if (LOG.isLoggable(INFO)) LOG.info("Discovering peers for " + t);
-		try {
-			Map<ContactId, TransportProperties> remote =
-					transportPropertyManager.getRemoteProperties(t);
-			Collection<ContactId> connected =
-					connectionRegistry.getConnectedContacts(t);
-			List<Pair<TransportProperties, DiscoveryHandler>> properties =
-					new ArrayList<>();
-			for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
-				ContactId c = e.getKey();
-				if (!connected.contains(c)) {
-					DiscoHandler handler = new DiscoHandler(c, p);
-					properties.add(new Pair<>(e.getValue(), handler));
-				}
-			}
-			if (!properties.isEmpty()) p.discoverPeers(properties);
-		} catch (DbException e) {
-			logException(LOG, WARNING, e);
-		}
-	}
-
 	private class ScheduledPollTask {
 
 		private final PollTask task;
@@ -296,23 +268,16 @@ class PollerImpl implements Poller, EventListener {
 			int delay = plugin.getPollingInterval();
 			if (randomiseNext) delay = (int) (delay * random.nextDouble());
 			schedule(plugin, delay, false);
-			// FIXME: Revert
-			if (plugin instanceof DuplexPlugin) {
-				DuplexPlugin d = (DuplexPlugin) plugin;
-				if (d.supportsDiscovery()) discover(d);
-				else poll(d);
-			} else {
-				poll(plugin);
-			}
+			poll(plugin);
 		}
 	}
 
-	private class ConnHandler implements ConnectionHandler {
+	private class Handler implements ConnectionHandler {
 
 		private final ContactId contactId;
 		private final TransportId transportId;
 
-		private ConnHandler(ContactId contactId, TransportId transportId) {
+		private Handler(ContactId contactId, TransportId transportId) {
 			this.contactId = contactId;
 			this.transportId = transportId;
 		}
@@ -335,27 +300,4 @@ class PollerImpl implements Poller, EventListener {
 					transportId, w);
 		}
 	}
-
-	private class DiscoHandler implements DiscoveryHandler {
-
-		private final ContactId contactId;
-		private final DuplexPlugin plugin;
-
-		private DiscoHandler(ContactId contactId, DuplexPlugin plugin) {
-			this.contactId = contactId;
-			this.plugin = plugin;
-		}
-
-		@Override
-		public void handleDevice(TransportProperties p) {
-			LOG.info("Discovered contact via " + plugin.getId());
-			ioExecutor.execute(() -> {
-				DuplexTransportConnection c = plugin.createConnection(p);
-				if (c != null) {
-					connectionManager.manageOutgoingConnection(contactId,
-							plugin.getId(), c);
-				}
-			});
-		}
-	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothPlugin.java

@@ -9,13 +9,10 @@ import org.briarproject.bramble.api.keyagreement.KeyAgreementConnection;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 import org.briarproject.bramble.api.keyagreement.event.KeyAgreementListeningEvent;
 import org.briarproject.bramble.api.keyagreement.event.KeyAgreementStoppedListeningEvent;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.ConnectionHandler;
-import org.briarproject.bramble.api.plugin.DiscoveryHandler;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.PluginException;
 import org.briarproject.bramble.api.plugin.TransportId;
@@ -32,28 +29,23 @@ import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
 
 import java.io.IOException;
 import java.security.SecureRandom;
-import java.util.List;
+import java.util.Collection;
 import java.util.UUID;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
-import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_BLUETOOTH;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
+import static org.briarproject.bramble.api.plugin.BluetoothConstants.PREF_BT_ENABLE;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_ADDRESS;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_UUID;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.UUID_BYTES;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.DISABLED;
-import static org.briarproject.bramble.api.plugin.Plugin.State.INACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.STARTING_STOPPING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
@@ -76,9 +68,9 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	private final int maxLatency;
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
-	protected final PluginState state = new PluginState();
-
+	private volatile boolean running = false, contactConnections = false;
 	private volatile String contactConnectionsUuid = null;
+	private volatile SS socket = null;
 
 	abstract void initialiseAdapter() throws IOException;
 
@@ -127,18 +119,14 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		LOG.info("Bluetooth enabled");
 		// We may not have been able to get the local address before
 		ioExecutor.execute(this::updateProperties);
-		if (getState() == INACTIVE) bind();
+		if (shouldAllowContactConnections()) bind();
 	}
 
 	void onAdapterDisabled() {
 		LOG.info("Bluetooth disabled");
+		tryToClose(socket);
 		connectionLimiter.allConnectionsClosed();
-		// The server socket may not have been closed automatically
-		SS ss = state.clearServerSocket();
-		if (ss != null) {
-			LOG.info("Closing server socket");
-			tryToClose(ss);
-		}
+		callback.transportDisabled();
 	}
 
 	@Override
@@ -160,24 +148,31 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	@Override
 	public void start() throws PluginException {
 		if (used.getAndSet(true)) throw new IllegalStateException();
-		Settings settings = callback.getSettings();
-		boolean enabledByUser = settings.getBoolean(PREF_PLUGIN_ENABLE, false);
-		state.setStarted(enabledByUser);
 		try {
 			initialiseAdapter();
 		} catch (IOException e) {
 			throw new PluginException(e);
 		}
 		updateProperties();
-		if (enabledByUser) {
+		running = true;
+		loadSettings(callback.getSettings());
+		if (shouldAllowContactConnections()) {
 			if (isAdapterEnabled()) bind();
 			else enableAdapter();
 		}
 	}
 
+	private void loadSettings(Settings settings) {
+		contactConnections = settings.getBoolean(PREF_BT_ENABLE, false);
+	}
+
+	private boolean shouldAllowContactConnections() {
+		return contactConnections;
+	}
+
 	private void bind() {
 		ioExecutor.execute(() -> {
-			if (getState() != INACTIVE) return;
+			if (!isRunning() || !shouldAllowContactConnections()) return;
 			// Bind a server socket to accept connections from contacts
 			SS ss;
 			try {
@@ -186,13 +181,14 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 				logException(LOG, WARNING, e);
 				return;
 			}
-			if (!state.setServerSocket(ss)) {
-				LOG.info("Closing redundant server socket");
+			if (!isRunning() || !shouldAllowContactConnections()) {
 				tryToClose(ss);
 				return;
 			}
+			socket = ss;
 			backoff.reset();
-			acceptContactConnections(ss);
+			callback.transportEnabled();
+			acceptContactConnections();
 		});
 	}
 
@@ -221,39 +217,34 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		if (changed) callback.mergeLocalProperties(p);
 	}
 
-	private void acceptContactConnections(SS ss) {
+	private void acceptContactConnections() {
 		while (true) {
 			DuplexTransportConnection conn;
 			try {
-				conn = acceptConnection(ss);
+				conn = acceptConnection(socket);
 			} catch (IOException e) {
-				// This is expected when the server socket is closed
-				LOG.info("Server socket closed");
-				state.clearServerSocket();
+				// This is expected when the socket is closed
+				if (LOG.isLoggable(INFO)) LOG.info(e.toString());
 				return;
 			}
-			LOG.info("Connection received");
 			backoff.reset();
 			if (connectionLimiter.contactConnectionOpened(conn))
 				callback.handleConnection(conn);
+			if (!running) return;
 		}
 	}
 
 	@Override
 	public void stop() {
-		SS ss = state.setStopped();
-		tryToClose(ss);
+		running = false;
+		tryToClose(socket);
+		callback.transportDisabled();
 		disableAdapterIfEnabledByUs();
 	}
 
 	@Override
-	public State getState() {
-		return state.getState();
-	}
-
-	@Override
-	public int getReasonsDisabled() {
-		return state.getReasonsDisabled();
+	public boolean isRunning() {
+		return running && isAdapterEnabled();
 	}
 
 	@Override
@@ -267,9 +258,9 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	}
 
 	@Override
-	public void poll(
-			List<Pair<TransportProperties, ConnectionHandler>> properties) {
-		if (getState() != ACTIVE) return;
+	public void poll(Collection<Pair<TransportProperties, ConnectionHandler>>
+			properties) {
+		if (!isRunning() || !shouldAllowContactConnections()) return;
 		backoff.increment();
 		for (Pair<TransportProperties, ConnectionHandler> p : properties) {
 			connect(p.getFirst(), p.getSecond());
@@ -282,7 +273,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		String uuid = p.get(PROP_UUID);
 		if (isNullOrEmpty(uuid)) return;
 		ioExecutor.execute(() -> {
-			if (getState() != ACTIVE) return;
+			if (!isRunning() || !shouldAllowContactConnections()) return;
 			if (!connectionLimiter.canOpenContactConnection()) return;
 			DuplexTransportConnection d = createConnection(p);
 			if (d != null) {
@@ -326,7 +317,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 
 	@Override
 	public DuplexTransportConnection createConnection(TransportProperties p) {
-		if (getState() != ACTIVE) return null;
+		if (!isRunning() || !shouldAllowContactConnections()) return null;
 		if (!connectionLimiter.canOpenContactConnection()) return null;
 		String address = p.get(PROP_ADDRESS);
 		if (isNullOrEmpty(address)) return null;
@@ -345,7 +336,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 
 	@Override
 	public KeyAgreementListener createKeyAgreementListener(byte[] commitment) {
-		if (getState() != ACTIVE) return null;
+		if (!isRunning()) return null;
 		// No truncation necessary because COMMIT_LENGTH = 16
 		String uuid = UUID.nameUUIDFromBytes(commitment).toString();
 		if (LOG.isLoggable(INFO)) LOG.info("Key agreement UUID " + uuid);
@@ -357,7 +348,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 			logException(LOG, WARNING, e);
 			return null;
 		}
-		if (getState() != ACTIVE) {
+		if (!isRunning()) {
 			tryToClose(ss);
 			return null;
 		}
@@ -371,7 +362,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	@Override
 	public DuplexTransportConnection createKeyAgreementConnection(
 			byte[] commitment, BdfList descriptor) {
-		if (getState() != ACTIVE) return null;
+		if (!isRunning()) return null;
 		// No truncation necessary because COMMIT_LENGTH = 16
 		String uuid = UUID.nameUUIDFromBytes(commitment).toString();
 		DuplexTransportConnection conn;
@@ -412,17 +403,6 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		throw new UnsupportedOperationException();
 	}
 
-	@Override
-	public boolean supportsDiscovery() {
-		return false;
-	}
-
-	@Override
-	public void discoverPeers(
-			List<Pair<TransportProperties, DiscoveryHandler>> properties) {
-		throw new UnsupportedOperationException();
-	}
-
 	@Override
 	public void eventOccurred(Event e) {
 		if (e instanceof EnableBluetoothEvent) {
@@ -442,17 +422,17 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		}
 	}
 
-	@IoExecutor
 	private void onSettingsUpdated(Settings settings) {
-		boolean enabledByUser = settings.getBoolean(PREF_PLUGIN_ENABLE, false);
-		SS ss = state.setEnabledByUser(enabledByUser);
-		State s = getState();
-		if (ss != null) {
-			LOG.info("Disabled by user, closing server socket");
-			tryToClose(ss);
+		boolean wasAllowed = shouldAllowContactConnections();
+		loadSettings(settings);
+		boolean isAllowed = shouldAllowContactConnections();
+		if (wasAllowed && !isAllowed) {
+			LOG.info("Contact connections disabled");
+			tryToClose(socket);
+			callback.transportDisabled();
 			disableAdapterIfEnabledByUs();
-		} else if (s == INACTIVE) {
-			LOG.info("Enabled by user, opening server socket");
+		} else if (!wasAllowed && isAllowed) {
+			LOG.info("Contact connections enabled");
 			if (isAdapterEnabled()) bind();
 			else enableAdapter();
 		}
@@ -480,70 +460,4 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 			tryToClose(ss);
 		}
 	}
-
-	@ThreadSafe
-	@NotNullByDefault
-	protected class PluginState {
-
-		@GuardedBy("this")
-		private boolean started = false,
-				stopped = false,
-				enabledByUser = false;
-
-		@GuardedBy("this")
-		@Nullable
-		private SS serverSocket = null;
-
-		synchronized void setStarted(boolean enabledByUser) {
-			started = true;
-			this.enabledByUser = enabledByUser;
-			callback.pluginStateChanged(getState());
-		}
-
-		@Nullable
-		synchronized SS setStopped() {
-			stopped = true;
-			SS ss = serverSocket;
-			serverSocket = null;
-			callback.pluginStateChanged(getState());
-			return ss;
-		}
-
-		@Nullable
-		synchronized SS setEnabledByUser(boolean enabledByUser) {
-			this.enabledByUser = enabledByUser;
-			SS ss = null;
-			if (!enabledByUser) {
-				ss = serverSocket;
-				serverSocket = null;
-			}
-			callback.pluginStateChanged(getState());
-			return ss;
-		}
-
-		synchronized boolean setServerSocket(SS ss) {
-			if (stopped || serverSocket != null) return false;
-			serverSocket = ss;
-			callback.pluginStateChanged(getState());
-			return true;
-		}
-
-		@Nullable
-		synchronized SS clearServerSocket() {
-			SS ss = serverSocket;
-			serverSocket = null;
-			callback.pluginStateChanged(getState());
-			return ss;
-		}
-
-		synchronized State getState() {
-			if (!started || stopped) return STARTING_STOPPING;
-			if (!enabledByUser) return DISABLED;
-			return serverSocket == null ? INACTIVE : ACTIVE;
-		}
-
-		synchronized int getReasonsDisabled() {
-			return getState() == DISABLED ? REASON_USER : 0;
-		}
-	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FilePlugin.java

@@ -16,7 +16,6 @@ import java.util.logging.Logger;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.plugin.FileConstants.PROP_PATH;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
@@ -46,7 +45,7 @@ abstract class FilePlugin implements SimplexPlugin {
 
 	@Override
 	public TransportConnectionReader createReader(TransportProperties p) {
-		if (getState() != ACTIVE) return null;
+		if (!isRunning()) return null;
 		String path = p.get(PROP_PATH);
 		if (isNullOrEmpty(path)) return null;
 		try {
@@ -61,7 +60,7 @@ abstract class FilePlugin implements SimplexPlugin {
 
 	@Override
 	public TransportConnectionWriter createWriter(TransportProperties p) {
-		if (getState() != ACTIVE) return null;
+		if (!isRunning()) return null;
 		String path = p.get(PROP_PATH);
 		if (isNullOrEmpty(path)) return null;
 		try {

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java

@@ -11,25 +11,24 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
+import org.briarproject.bramble.util.IoUtils;
 
 import java.io.IOException;
 import java.net.Inet4Address;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
-import java.net.InterfaceAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.net.SocketAddress;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
-import java.util.Random;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
-
-import static java.lang.Integer.parseInt;
 import static java.util.Collections.addAll;
+import static java.util.Collections.emptyList;
 import static java.util.Collections.sort;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
@@ -38,9 +37,7 @@ import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TR
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.PREF_LAN_IP_PORTS;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.PROP_IP_PORTS;
-import static org.briarproject.bramble.api.plugin.LanTcpConstants.PROP_PORT;
 import static org.briarproject.bramble.util.ByteUtils.MAX_16_BIT_UNSIGNED;
-import static org.briarproject.bramble.util.IoUtils.tryToClose;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 import static org.briarproject.bramble.util.StringUtils.join;
@@ -50,36 +47,15 @@ class LanTcpPlugin extends TcpPlugin {
 
 	private static final Logger LOG = getLogger(LanTcpPlugin.class.getName());
 
+	private static final LanAddressComparator ADDRESS_COMPARATOR =
+			new LanAddressComparator();
+
 	private static final int MAX_ADDRESSES = 4;
 	private static final String SEPARATOR = ",";
 
-	/**
-	 * The IP address of an Android device providing a wifi access point.
-	 */
-	protected static final InetAddress WIFI_AP_ADDRESS;
-
-	/**
-	 * The IP address of an Android device providing a wifi direct
-	 * legacy mode access point.
-	 */
-	protected static final InetAddress WIFI_DIRECT_AP_ADDRESS;
-
-	static {
-		try {
-			WIFI_AP_ADDRESS = InetAddress.getByAddress(
-					new byte[] {(byte) 192, (byte) 168, 43, 1});
-			WIFI_DIRECT_AP_ADDRESS = InetAddress.getByAddress(
-					new byte[] {(byte) 192, (byte) 168, 49, 1});
-		} catch (UnknownHostException e) {
-			// Should only be thrown if the address has an illegal length
-			throw new AssertionError(e);
-		}
-	}
-
 	LanTcpPlugin(Executor ioExecutor, Backoff backoff, PluginCallback callback,
-			int maxLatency, int maxIdleTime, int connectionTimeout) {
-		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime,
-				connectionTimeout);
+			int maxLatency, int maxIdleTime) {
+		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime);
 	}
 
 	@Override
@@ -87,83 +63,38 @@ class LanTcpPlugin extends TcpPlugin {
 		return ID;
 	}
 
-	@Override
-	public void start() {
-		if (used.getAndSet(true)) throw new IllegalStateException();
-		initialisePortProperty();
-		Settings settings = callback.getSettings();
-		state.setStarted(settings.getBoolean(PREF_PLUGIN_ENABLE, false));
-		bind();
-	}
-
-	protected void initialisePortProperty() {
-		TransportProperties p = callback.getLocalProperties();
-		if (isNullOrEmpty(p.get(PROP_PORT))) {
-			int port = new Random().nextInt(32768) + 32768;
-			p.put(PROP_PORT, String.valueOf(port));
-			callback.mergeLocalProperties(p);
-		}
-	}
-
 	@Override
 	protected List<InetSocketAddress> getLocalSocketAddresses() {
+		// Use the same address and port as last time if available
 		TransportProperties p = callback.getLocalProperties();
-		int preferredPort = parsePortProperty(p.get(PROP_PORT));
 		String oldIpPorts = p.get(PROP_IP_PORTS);
 		List<InetSocketAddress> olds = parseSocketAddresses(oldIpPorts);
-
 		List<InetSocketAddress> locals = new ArrayList<>();
-		List<InetSocketAddress> fallbacks = new ArrayList<>();
-		for (InetAddress local : getUsableLocalInetAddresses()) {
-			// If we've used this address before, try to use the same port
-			int port = preferredPort;
-			for (InetSocketAddress old : olds) {
-				if (old.getAddress().equals(local)) {
-					port = old.getPort();
-					break;
+		for (InetAddress local : getLocalIpAddresses()) {
+			if (isAcceptableAddress(local)) {
+				// If this is the old address, try to use the same port
+				for (InetSocketAddress old : olds) {
+					if (old.getAddress().equals(local))
+						locals.add(new InetSocketAddress(local, old.getPort()));
 				}
+				locals.add(new InetSocketAddress(local, 0));
 			}
-			locals.add(new InetSocketAddress(local, port));
-			// Fall back to any available port
-			fallbacks.add(new InetSocketAddress(local, 0));
 		}
-		locals.addAll(fallbacks);
+		sort(locals, ADDRESS_COMPARATOR);
 		return locals;
 	}
 
-	private int parsePortProperty(@Nullable String portProperty) {
-		if (isNullOrEmpty(portProperty)) return 0;
-		try {
-			return parseInt(portProperty);
-		} catch (NumberFormatException e) {
-			return 0;
-		}
-	}
-
 	private List<InetSocketAddress> parseSocketAddresses(String ipPorts) {
+		if (isNullOrEmpty(ipPorts)) return emptyList();
+		String[] split = ipPorts.split(SEPARATOR);
 		List<InetSocketAddress> addresses = new ArrayList<>();
-		if (isNullOrEmpty(ipPorts)) return addresses;
-		for (String ipPort : ipPorts.split(SEPARATOR)) {
+		for (String ipPort : split) {
 			InetSocketAddress a = parseSocketAddress(ipPort);
 			if (a != null) addresses.add(a);
 		}
 		return addresses;
 	}
 
-	protected List<InetAddress> getUsableLocalInetAddresses() {
-		List<InterfaceAddress> ifAddrs =
-				new ArrayList<>(getLocalInterfaceAddresses());
-		// Prefer longer network prefixes
-		sort(ifAddrs, (a, b) ->
-				b.getNetworkPrefixLength() - a.getNetworkPrefixLength());
-		List<InetAddress> addrs = new ArrayList<>();
-		for (InterfaceAddress ifAddr : ifAddrs) {
-			InetAddress addr = ifAddr.getAddress();
-			if (isAcceptableAddress(addr)) addrs.add(addr);
-		}
-		return addrs;
-	}
-
 	@Override
 	protected void setLocalSocketAddress(InetSocketAddress a) {
 		String ipPort = getIpPortString(a);
@@ -201,20 +132,7 @@ class LanTcpPlugin extends TcpPlugin {
 	@Override
 	protected List<InetSocketAddress> getRemoteSocketAddresses(
 			TransportProperties p) {
-		String ipPorts = p.get(PROP_IP_PORTS);
-		List<InetSocketAddress> remotes = parseSocketAddresses(ipPorts);
-		int port = parsePortProperty(p.get(PROP_PORT));
-		// If the contact has a preferred port, we can guess their IP:port when
-		// they're providing a wifi access point
-		if (port != 0) {
-			InetSocketAddress wifiAp =
-					new InetSocketAddress(WIFI_AP_ADDRESS, port);
-			if (!remotes.contains(wifiAp)) remotes.add(wifiAp);
-			InetSocketAddress wifiDirectAp =
-					new InetSocketAddress(WIFI_DIRECT_AP_ADDRESS, port);
-			if (!remotes.contains(wifiDirectAp)) remotes.add(wifiDirectAp);
-		}
-		return remotes;
+		return parseSocketAddresses(p.get(PROP_IP_PORTS));
 	}
 
 	private boolean isAcceptableAddress(InetAddress a) {
@@ -227,33 +145,52 @@ class LanTcpPlugin extends TcpPlugin {
 	}
 
 	@Override
-	protected boolean isConnectable(InterfaceAddress local,
-			InetSocketAddress remote) {
+	protected boolean isConnectable(InetSocketAddress remote) {
 		if (remote.getPort() == 0) return false;
 		if (!isAcceptableAddress(remote.getAddress())) return false;
 		// Try to determine whether the address is on the same LAN as us
-		byte[] localIp = local.getAddress().getAddress();
+		if (socket == null) return false;
+		byte[] localIp = socket.getInetAddress().getAddress();
 		byte[] remoteIp = remote.getAddress().getAddress();
-		int prefixLength = local.getNetworkPrefixLength();
-		return areAddressesInSameNetwork(localIp, remoteIp, prefixLength);
+		return addressesAreOnSameLan(localIp, remoteIp);
 	}
 
 	// Package access for testing
-	static boolean areAddressesInSameNetwork(byte[] localIp, byte[] remoteIp,
-			int prefixLength) {
-		if (localIp.length != remoteIp.length) return false;
-		// Compare the first prefixLength bits of the addresses
-		for (int i = 0; i < prefixLength; i++) {
-			int byteIndex = i >> 3;
-			int bitIndex = i & 7; // 0 to 7
-			int mask = 128 >> bitIndex; // Select the bit at bitIndex
-			if ((localIp[byteIndex] & mask) != (remoteIp[byteIndex] & mask)) {
-				return false; // Addresses differ at bit i
-			}
-		}
+	boolean addressesAreOnSameLan(byte[] localIp, byte[] remoteIp) {
+		// 10.0.0.0/8
+		if (isPrefix10(localIp)) return isPrefix10(remoteIp);
+		// 172.16.0.0/12
+		if (isPrefix172(localIp)) return isPrefix172(remoteIp);
+		// 192.168.0.0/16
+		if (isPrefix192(localIp)) return isPrefix192(remoteIp);
+		// Unrecognised prefix - may be compatible
 		return true;
 	}
 
+	private static boolean isPrefix10(byte[] ipv4) {
+		return ipv4[0] == 10;
+	}
+
+	private static boolean isPrefix172(byte[] ipv4) {
+		return ipv4[0] == (byte) 172 && (ipv4[1] & 0xF0) == 16;
+	}
+
+	private static boolean isPrefix192(byte[] ipv4) {
+		return ipv4[0] == (byte) 192 && ipv4[1] == (byte) 168;
+	}
+
+	// Returns the prefix length for an RFC 1918 address, or 0 for any other
+	// address
+	private static int getRfc1918PrefixLength(InetAddress addr) {
+		if (!(addr instanceof Inet4Address)) return 0;
+		if (!addr.isSiteLocalAddress()) return 0;
+		byte[] ipv4 = addr.getAddress();
+		if (isPrefix10(ipv4)) return 8;
+		if (isPrefix172(ipv4)) return 12;
+		if (isPrefix192(ipv4)) return 16;
+		return 0;
+	}
+
 	@Override
 	public boolean supportsKeyAgreement() {
 		return true;
@@ -272,10 +209,10 @@ class LanTcpPlugin extends TcpPlugin {
 			} catch (IOException e) {
 				if (LOG.isLoggable(INFO))
 					LOG.info("Failed to bind " + scrubSocketAddress(addr));
-				tryToClose(ss, LOG, WARNING);
+				tryToClose(ss);
 			}
 		}
-		if (ss == null) {
+		if (ss == null || !ss.isBound()) {
 			LOG.info("Could not bind server socket for key agreement");
 			return null;
 		}
@@ -291,13 +228,7 @@ class LanTcpPlugin extends TcpPlugin {
 	@Override
 	public DuplexTransportConnection createKeyAgreementConnection(
 			byte[] commitment, BdfList descriptor) {
-		ServerSocket ss = state.getServerSocket();
-		if (ss == null) return null;
-		InterfaceAddress local = getLocalInterfaceAddress(ss.getInetAddress());
-		if (local == null) {
-			LOG.warning("No interface for key agreement server socket");
-			return null;
-		}
+		if (!isRunning()) return null;
 		InetSocketAddress remote;
 		try {
 			remote = parseSocketAddress(descriptor);
@@ -305,11 +236,12 @@ class LanTcpPlugin extends TcpPlugin {
 			LOG.info("Invalid IP/port in key agreement descriptor");
 			return null;
 		}
-		if (!isConnectable(local, remote)) {
+		if (!isConnectable(remote)) {
 			if (LOG.isLoggable(INFO)) {
+				SocketAddress local = socket.getLocalSocketAddress();
 				LOG.info(scrubSocketAddress(remote) +
 						" is not connectable from " +
-						scrubSocketAddress(ss.getLocalSocketAddress()));
+						scrubSocketAddress(local));
 			}
 			return null;
 		}
@@ -317,8 +249,8 @@ class LanTcpPlugin extends TcpPlugin {
 			if (LOG.isLoggable(INFO))
 				LOG.info("Connecting to " + scrubSocketAddress(remote));
 			Socket s = createSocket();
-			s.bind(new InetSocketAddress(ss.getInetAddress(), 0));
-			s.connect(remote, connectionTimeout);
+			s.bind(new InetSocketAddress(socket.getInetAddress(), 0));
+			s.connect(remote);
 			s.setSoTimeout(socketTimeout);
 			if (LOG.isLoggable(INFO))
 				LOG.info("Connected to " + scrubSocketAddress(remote));
@@ -364,7 +296,22 @@ class LanTcpPlugin extends TcpPlugin {
 
 		@Override
 		public void close() {
-			tryToClose(ss, LOG, WARNING);
+			IoUtils.tryToClose(ss, LOG, WARNING);
+		}
+	}
+
+	static class LanAddressComparator implements Comparator<InetSocketAddress> {
+
+		@Override
+		public int compare(InetSocketAddress a, InetSocketAddress b) {
+			// Prefer addresses with non-zero ports
+			int aPort = a.getPort(), bPort = b.getPort();
+			if (aPort > 0 && bPort == 0) return -1;
+			if (aPort == 0 && bPort > 0) return 1;
+			// Prefer addresses with longer RFC 1918 prefixes
+			int aPrefix = getRfc1918PrefixLength(a.getAddress());
+			int bPrefix = getRfc1918PrefixLength(b.getAddress());
+			return bPrefix - aPrefix;
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPluginFactory.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.plugin.tcp;
 
-import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
@@ -19,21 +18,18 @@ import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
 @NotNullByDefault
 public class LanTcpPluginFactory implements DuplexPluginFactory {
 
-	private static final int MAX_LATENCY = 30_000; // 30 seconds
-	private static final int MAX_IDLE_TIME = 30_000; // 30 seconds
-	private static final int CONNECTION_TIMEOUT = 3_000; // 3 seconds
-	private static final int MIN_POLLING_INTERVAL = 60_000; // 1 minute
-	private static final int MAX_POLLING_INTERVAL = 600_000; // 10 mins
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
+	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
 	private static final double BACKOFF_BASE = 1.2;
 
 	private final Executor ioExecutor;
-	private final EventBus eventBus;
 	private final BackoffFactory backoffFactory;
 
-	public LanTcpPluginFactory(Executor ioExecutor, EventBus eventBus,
+	public LanTcpPluginFactory(Executor ioExecutor,
 			BackoffFactory backoffFactory) {
 		this.ioExecutor = ioExecutor;
-		this.eventBus = eventBus;
 		this.backoffFactory = backoffFactory;
 	}
 
@@ -51,9 +47,7 @@ public class LanTcpPluginFactory implements DuplexPluginFactory {
 	public DuplexPlugin createPlugin(PluginCallback callback) {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-		LanTcpPlugin plugin =  new LanTcpPlugin(ioExecutor, backoff, callback, MAX_LATENCY,
-				MAX_IDLE_TIME, CONNECTION_TIMEOUT);
-		eventBus.addListener(plugin);
-		return plugin;
+		return new LanTcpPlugin(ioExecutor, backoff, callback, MAX_LATENCY,
+				MAX_IDLE_TIME);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/TcpPlugin.java

@@ -2,31 +2,27 @@ package org.briarproject.bramble.plugin.tcp;
 
 import org.briarproject.bramble.PoliteExecutor;
 import org.briarproject.bramble.api.Pair;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.event.EventListener;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.data.BdfList;
+import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.ConnectionHandler;
-import org.briarproject.bramble.api.plugin.DiscoveryHandler;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.rendezvous.KeyMaterialSource;
 import org.briarproject.bramble.api.rendezvous.RendezvousEndpoint;
-import org.briarproject.bramble.api.settings.Settings;
-import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
+import org.briarproject.bramble.util.IoUtils;
 
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
-import java.net.InterfaceAddress;
 import java.net.NetworkInterface;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.net.SocketAddress;
 import java.net.SocketException;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
@@ -39,26 +35,20 @@ import java.util.logging.Logger;
 import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
-import javax.annotation.concurrent.ThreadSafe;
 
+import static java.net.NetworkInterface.getNetworkInterfaces;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.list;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.DISABLED;
-import static org.briarproject.bramble.api.plugin.Plugin.State.INACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.STARTING_STOPPING;
-import static org.briarproject.bramble.util.IoUtils.tryToClose;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-abstract class TcpPlugin implements DuplexPlugin, EventListener {
+abstract class TcpPlugin implements DuplexPlugin {
 
 	private static final Logger LOG = getLogger(TcpPlugin.class.getName());
 
@@ -68,10 +58,11 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 	protected final Executor ioExecutor, bindExecutor;
 	protected final Backoff backoff;
 	protected final PluginCallback callback;
-	protected final int maxLatency, maxIdleTime;
-	protected final int connectionTimeout, socketTimeout;
+	protected final int maxLatency, maxIdleTime, socketTimeout;
 	protected final AtomicBoolean used = new AtomicBoolean(false);
-	protected final PluginState state = new PluginState();
+
+	protected volatile boolean running = false;
+	protected volatile ServerSocket socket = null;
 
 	/**
 	 * Returns zero or more socket addresses on which the plugin should listen,
@@ -95,18 +86,15 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 	/**
 	 * Returns true if connections to the given address can be attempted.
 	 */
-	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
-	protected abstract boolean isConnectable(InterfaceAddress local,
-			InetSocketAddress remote);
+	protected abstract boolean isConnectable(InetSocketAddress remote);
 
 	TcpPlugin(Executor ioExecutor, Backoff backoff, PluginCallback callback,
-			int maxLatency, int maxIdleTime, int connectionTimeout) {
+			int maxLatency, int maxIdleTime) {
 		this.ioExecutor = ioExecutor;
 		this.backoff = backoff;
 		this.callback = callback;
 		this.maxLatency = maxLatency;
 		this.maxIdleTime = maxIdleTime;
-		this.connectionTimeout = connectionTimeout;
 		if (maxIdleTime > Integer.MAX_VALUE / 2)
 			socketTimeout = Integer.MAX_VALUE;
 		else socketTimeout = maxIdleTime * 2;
@@ -127,14 +115,14 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 	@Override
 	public void start() {
 		if (used.getAndSet(true)) throw new IllegalStateException();
-		Settings settings = callback.getSettings();
-		state.setStarted(settings.getBoolean(PREF_PLUGIN_ENABLE, false));
+		running = true;
 		bind();
 	}
 
 	protected void bind() {
 		bindExecutor.execute(() -> {
-			if (getState() != INACTIVE) return;
+			if (!running) return;
+			if (socket != null && !socket.isClosed()) return;
 			ServerSocket ss = null;
 			for (InetSocketAddress addr : getLocalSocketAddresses()) {
 				try {
@@ -144,28 +132,34 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 				} catch (IOException e) {
 					if (LOG.isLoggable(INFO))
 						LOG.info("Failed to bind " + scrubSocketAddress(addr));
-					tryToClose(ss, LOG, WARNING);
+					tryToClose(ss);
 				}
 			}
-			if (ss == null) {
+			if (ss == null || !ss.isBound()) {
 				LOG.info("Could not bind server socket");
 				return;
 			}
-			if (!state.setServerSocket(ss)) {
-				LOG.info("Closing redundant server socket");
-				tryToClose(ss, LOG, WARNING);
+			if (!running) {
+				tryToClose(ss);
 				return;
 			}
+			socket = ss;
 			backoff.reset();
 			InetSocketAddress local =
 					(InetSocketAddress) ss.getLocalSocketAddress();
 			setLocalSocketAddress(local);
 			if (LOG.isLoggable(INFO))
 				LOG.info("Listening on " + scrubSocketAddress(local));
-			acceptContactConnections(ss);
+			callback.transportEnabled();
+			acceptContactConnections();
 		});
 	}
 
+	protected void tryToClose(@Nullable ServerSocket ss) {
+		IoUtils.tryToClose(ss, LOG, WARNING);
+		callback.transportDisabled();
+	}
+
 	String getIpPortString(InetSocketAddress a) {
 		String addr = a.getAddress().getHostAddress();
 		int percent = addr.indexOf('%');
@@ -173,16 +167,15 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 		return addr + ":" + a.getPort();
 	}
 
-	private void acceptContactConnections(ServerSocket ss) {
-		while (true) {
+	private void acceptContactConnections() {
+		while (isRunning()) {
 			Socket s;
 			try {
-				s = ss.accept();
+				s = socket.accept();
 				s.setSoTimeout(socketTimeout);
 			} catch (IOException e) {
-				// This is expected when the server socket is closed
-				LOG.info("Server socket closed");
-				state.clearServerSocket(ss);
+				// This is expected when the socket is closed
+				if (LOG.isLoggable(INFO)) LOG.info(e.toString());
 				return;
 			}
 			if (LOG.isLoggable(INFO))
@@ -195,18 +188,13 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 
 	@Override
 	public void stop() {
-		ServerSocket ss = state.setStopped();
-		tryToClose(ss, LOG, WARNING);
+		running = false;
+		tryToClose(socket);
 	}
 
 	@Override
-	public State getState() {
-		return state.getState();
-	}
-
-	@Override
-	public int getReasonsDisabled() {
-		return state.getReasonsDisabled();
+	public boolean isRunning() {
+		return running && socket != null && !socket.isClosed();
 	}
 
 	@Override
@@ -220,9 +208,9 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 	}
 
 	@Override
-	public void poll(
-			List<Pair<TransportProperties, ConnectionHandler>> properties) {
-		if (getState() != ACTIVE) return;
+	public void poll(Collection<Pair<TransportProperties, ConnectionHandler>>
+			properties) {
+		if (!isRunning()) return;
 		backoff.increment();
 		for (Pair<TransportProperties, ConnectionHandler> p : properties) {
 			connect(p.getFirst(), p.getSecond());
@@ -241,24 +229,14 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 
 	@Override
 	public DuplexTransportConnection createConnection(TransportProperties p) {
-		ServerSocket ss = state.getServerSocket();
-		if (ss == null) return null;
-		InterfaceAddress local = getLocalInterfaceAddress(ss.getInetAddress());
-		if (local == null) {
-			LOG.warning("No interface for server socket");
-			return null;
-		}
+		if (!isRunning()) return null;
 		for (InetSocketAddress remote : getRemoteSocketAddresses(p)) {
-			// Don't try to connect to our own address
-			if (!canConnectToOwnAddress() &&
-					remote.getAddress().equals(ss.getInetAddress())) {
-				continue;
-			}
-			if (!isConnectable(local, remote)) {
+			if (!isConnectable(remote)) {
 				if (LOG.isLoggable(INFO)) {
+					SocketAddress local = socket.getLocalSocketAddress();
 					LOG.info(scrubSocketAddress(remote) +
 							" is not connectable from " +
-							scrubSocketAddress(ss.getLocalSocketAddress()));
+							scrubSocketAddress(local));
 				}
 				continue;
 			}
@@ -266,8 +244,8 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 				if (LOG.isLoggable(INFO))
 					LOG.info("Connecting to " + scrubSocketAddress(remote));
 				Socket s = createSocket();
-				s.bind(new InetSocketAddress(ss.getInetAddress(), 0));
-				s.connect(remote, connectionTimeout);
+				s.bind(new InetSocketAddress(socket.getInetAddress(), 0));
+				s.connect(remote);
 				s.setSoTimeout(socketTimeout);
 				if (LOG.isLoggable(INFO))
 					LOG.info("Connected to " + scrubSocketAddress(remote));
@@ -281,19 +259,6 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 		return null;
 	}
 
-	@Nullable
-	InterfaceAddress getLocalInterfaceAddress(InetAddress a) {
-		for (InterfaceAddress ifAddr : getLocalInterfaceAddresses()) {
-			if (ifAddr.getAddress().equals(a)) return ifAddr;
-		}
-		return null;
-	}
-
-	// Override for testing
-	protected boolean canConnectToOwnAddress() {
-		return false;
-	}
-
 	protected Socket createSocket() throws IOException {
 		return new Socket();
 	}
@@ -322,6 +287,22 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 		}
 	}
 
+	@Override
+	public boolean supportsKeyAgreement() {
+		return false;
+	}
+
+	@Override
+	public KeyAgreementListener createKeyAgreementListener(byte[] commitment) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public DuplexTransportConnection createKeyAgreementConnection(
+			byte[] commitment, BdfList descriptor) {
+		throw new UnsupportedOperationException();
+	}
+
 	@Override
 	public boolean supportsRendezvous() {
 		return false;
@@ -333,130 +314,17 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 		throw new UnsupportedOperationException();
 	}
 
-	@Override
-	public boolean supportsDiscovery() {
-		return false;
-	}
-
-	@Override
-	public void discoverPeers(
-			List<Pair<TransportProperties, DiscoveryHandler>> properties) {
-		throw new UnsupportedOperationException();
-	}
-
-	List<InterfaceAddress> getLocalInterfaceAddresses() {
-		List<InterfaceAddress> addrs = new ArrayList<>();
-		for (NetworkInterface iface : getNetworkInterfaces()) {
-			addrs.addAll(iface.getInterfaceAddresses());
-		}
-		return addrs;
-	}
-
-	List<InetAddress> getLocalInetAddresses() {
-		List<InetAddress> addrs = new ArrayList<>();
-		for (NetworkInterface iface : getNetworkInterfaces()) {
-			addrs.addAll(list(iface.getInetAddresses()));
-		}
-		return addrs;
-	}
-
-	private List<NetworkInterface> getNetworkInterfaces() {
+	Collection<InetAddress> getLocalIpAddresses() {
 		try {
-			Enumeration<NetworkInterface> ifaces =
-					NetworkInterface.getNetworkInterfaces();
-			return ifaces == null ? emptyList() : list(ifaces);
+			Enumeration<NetworkInterface> ifaces = getNetworkInterfaces();
+			if (ifaces == null) return emptyList();
+			List<InetAddress> addrs = new ArrayList<>();
+			for (NetworkInterface iface : list(ifaces))
+				addrs.addAll(list(iface.getInetAddresses()));
+			return addrs;
 		} catch (SocketException e) {
 			logException(LOG, WARNING, e);
 			return emptyList();
 		}
 	}
-
-	@Override
-	public void eventOccurred(Event e) {
-		if (e instanceof SettingsUpdatedEvent) {
-			SettingsUpdatedEvent s = (SettingsUpdatedEvent) e;
-			if (s.getNamespace().equals(getId().getString()))
-				ioExecutor.execute(() -> onSettingsUpdated(s.getSettings()));
-		}
-	}
-
-	@IoExecutor
-	private void onSettingsUpdated(Settings settings) {
-		boolean enabledByUser = settings.getBoolean(PREF_PLUGIN_ENABLE, false);
-		ServerSocket ss = state.setEnabledByUser(enabledByUser);
-		State s = getState();
-		if (ss != null) {
-			LOG.info("Disabled by user, closing server socket");
-			tryToClose(ss, LOG, WARNING);
-		} else if (s == INACTIVE) {
-			LOG.info("Enabled by user, opening server socket");
-			bind();
-		}
-	}
-
-	@ThreadSafe
-	@NotNullByDefault
-	protected class PluginState {
-
-		@GuardedBy("this")
-		private boolean started = false, stopped = false, enabledByUser = false;
-
-		@GuardedBy("this")
-		@Nullable
-		private ServerSocket serverSocket = null;
-
-		synchronized void setStarted(boolean enabledByUser) {
-			started = true;
-			this.enabledByUser = enabledByUser;
-			callback.pluginStateChanged(getState());
-		}
-
-		@Nullable
-		synchronized ServerSocket setStopped() {
-			stopped = true;
-			ServerSocket ss = serverSocket;
-			serverSocket = null;
-			callback.pluginStateChanged(getState());
-			return ss;
-		}
-
-		@Nullable
-		synchronized ServerSocket setEnabledByUser(boolean enabledByUser) {
-			this.enabledByUser = enabledByUser;
-			ServerSocket ss = null;
-			if (!enabledByUser) {
-				ss = serverSocket;
-				serverSocket = null;
-			}
-			callback.pluginStateChanged(getState());
-			return ss;
-		}
-
-		@Nullable
-		synchronized ServerSocket getServerSocket() {
-			return serverSocket;
-		}
-
-		synchronized boolean setServerSocket(ServerSocket ss) {
-			if (stopped || serverSocket != null) return false;
-			serverSocket = ss;
-			callback.pluginStateChanged(getState());
-			return true;
-		}
-
-		synchronized void clearServerSocket(ServerSocket ss) {
-			if (serverSocket == ss) serverSocket = null;
-			callback.pluginStateChanged(getState());
-		}
-
-		synchronized State getState() {
-			if (!started || stopped) return STARTING_STOPPING;
-			if (!enabledByUser) return DISABLED;
-			return serverSocket == null ? INACTIVE : ACTIVE;
-		}
-
-		synchronized int getReasonsDisabled() {
-			return getState() == DISABLED ? REASON_USER : 0;
-		}
-	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/WanTcpPlugin.java

@@ -1,19 +1,15 @@
 package org.briarproject.bramble.plugin.tcp;
 
-import org.briarproject.bramble.api.data.BdfList;
-import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 
 import java.net.Inet4Address;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
-import java.net.InterfaceAddress;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.Executor;
@@ -33,10 +29,8 @@ class WanTcpPlugin extends TcpPlugin {
 	private volatile MappingResult mappingResult;
 
 	WanTcpPlugin(Executor ioExecutor, Backoff backoff, PortMapper portMapper,
-			PluginCallback callback, int maxLatency, int maxIdleTime,
-			int connectionTimeout) {
-		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime,
-				connectionTimeout);
+			PluginCallback callback, int maxLatency, int maxIdleTime) {
+		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime);
 		this.portMapper = portMapper;
 	}
 
@@ -45,29 +39,13 @@ class WanTcpPlugin extends TcpPlugin {
 		return ID;
 	}
 
-	@Override
-	public boolean supportsKeyAgreement() {
-		return false;
-	}
-
-	@Override
-	public KeyAgreementListener createKeyAgreementListener(byte[] commitment) {
-		throw new UnsupportedOperationException();
-	}
-
-	@Override
-	public DuplexTransportConnection createKeyAgreementConnection(
-			byte[] commitment, BdfList descriptor) {
-		throw new UnsupportedOperationException();
-	}
-
 	@Override
 	protected List<InetSocketAddress> getLocalSocketAddresses() {
 		// Use the same address and port as last time if available
 		TransportProperties p = callback.getLocalProperties();
 		InetSocketAddress old = parseSocketAddress(p.get(PROP_IP_PORT));
 		List<InetSocketAddress> addrs = new LinkedList<>();
-		for (InetAddress a : getLocalInetAddresses()) {
+		for (InetAddress a : getLocalIpAddresses()) {
 			if (isAcceptableAddress(a)) {
 				// If this is the old address, try to use the same port
 				if (old != null && old.getAddress().equals(a))
@@ -108,8 +86,7 @@ class WanTcpPlugin extends TcpPlugin {
 	}
 
 	@Override
-	protected boolean isConnectable(InterfaceAddress local,
-			InetSocketAddress remote) {
+	protected boolean isConnectable(InetSocketAddress remote) {
 		if (remote.getPort() == 0) return false;
 		return isAcceptableAddress(remote.getAddress());
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/WanTcpPluginFactory.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.plugin.tcp;
 
-import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.lifecycle.ShutdownManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
@@ -20,22 +19,19 @@ import static org.briarproject.bramble.api.plugin.WanTcpConstants.ID;
 @NotNullByDefault
 public class WanTcpPluginFactory implements DuplexPluginFactory {
 
-	private static final int MAX_LATENCY = 30_000; // 30 seconds
-	private static final int MAX_IDLE_TIME = 30_000; // 30 seconds
-	private static final int CONNECTION_TIMEOUT = 30_000; // 30 seconds
-	private static final int MIN_POLLING_INTERVAL = 60_000; // 1 minute
-	private static final int MAX_POLLING_INTERVAL = 600_000; // 10 mins
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
+	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
 	private static final double BACKOFF_BASE = 1.2;
 
 	private final Executor ioExecutor;
-	private final EventBus eventBus;
 	private final BackoffFactory backoffFactory;
 	private final ShutdownManager shutdownManager;
 
-	public WanTcpPluginFactory(Executor ioExecutor, EventBus eventBus,
+	public WanTcpPluginFactory(Executor ioExecutor,
 			BackoffFactory backoffFactory, ShutdownManager shutdownManager) {
 		this.ioExecutor = ioExecutor;
-		this.eventBus = eventBus;
 		this.backoffFactory = backoffFactory;
 		this.shutdownManager = shutdownManager;
 	}
@@ -54,10 +50,8 @@ public class WanTcpPluginFactory implements DuplexPluginFactory {
 	public DuplexPlugin createPlugin(PluginCallback callback) {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-		WanTcpPlugin plugin = new WanTcpPlugin(ioExecutor, backoff,
+		return new WanTcpPlugin(ioExecutor, backoff,
 				new PortMapperImpl(shutdownManager), callback, MAX_LATENCY,
-				MAX_IDLE_TIME, CONNECTION_TIMEOUT);
-		eventBus.addListener(plugin);
-		return plugin;
+				MAX_IDLE_TIME);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionProvider.java

@@ -17,7 +17,7 @@ public interface CircumventionProvider {
 	String[] BLOCKED = {"CN", "IR", "EG", "BY", "TR", "SY", "VE"};
 
 	/**
-	 * Countries where obfs4 or meek bridge connections are likely to work.
+	 * Countries where obfs4 bridge connection are likely to work.
 	 * Should be a subset of {@link #BLOCKED}.
 	 */
 	String[] BRIDGES = { "CN", "IR", "EG", "BY", "TR", "SY", "VE" };

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java

@@ -15,11 +15,9 @@ import org.briarproject.bramble.api.network.NetworkManager;
 import org.briarproject.bramble.api.network.NetworkStatus;
 import org.briarproject.bramble.api.network.event.NetworkStatusEvent;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.ConnectionHandler;
-import org.briarproject.bramble.api.plugin.DiscoveryHandler;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.PluginException;
 import org.briarproject.bramble.api.plugin.TorConstants;
@@ -56,9 +54,6 @@ import java.util.logging.Logger;
 import java.util.regex.Pattern;
 import java.util.zip.ZipInputStream;
 
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
-import javax.annotation.concurrent.ThreadSafe;
 import javax.net.SocketFactory;
 
 import static java.util.Arrays.asList;
@@ -70,11 +65,6 @@ import static java.util.logging.Logger.getLogger;
 import static net.freehaven.tor.control.TorControlCommands.HS_ADDRESS;
 import static net.freehaven.tor.control.TorControlCommands.HS_PRIVKEY;
 import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.DISABLED;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ENABLING;
-import static org.briarproject.bramble.api.plugin.Plugin.State.INACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.STARTING_STOPPING;
 import static org.briarproject.bramble.api.plugin.TorConstants.CONTROL_PORT;
 import static org.briarproject.bramble.api.plugin.TorConstants.ID;
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_MOBILE;
@@ -86,9 +76,6 @@ import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_ONLY_WHE
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_PORT;
 import static org.briarproject.bramble.api.plugin.TorConstants.PROP_ONION_V2;
 import static org.briarproject.bramble.api.plugin.TorConstants.PROP_ONION_V3;
-import static org.briarproject.bramble.api.plugin.TorConstants.REASON_BATTERY;
-import static org.briarproject.bramble.api.plugin.TorConstants.REASON_COUNTRY_BLOCKED;
-import static org.briarproject.bramble.api.plugin.TorConstants.REASON_MOBILE_DATA;
 import static org.briarproject.bramble.plugin.tor.TorRendezvousCrypto.SEED_BYTES;
 import static org.briarproject.bramble.util.IoUtils.copyAndClose;
 import static org.briarproject.bramble.util.IoUtils.tryToClose;
@@ -126,14 +113,16 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final int maxLatency, maxIdleTime, socketTimeout;
 	private final File torDirectory, torFile, geoIpFile, obfs4File, configFile;
 	private final File doneFile, cookieFile;
+	private final ConnectionStatus connectionStatus;
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
-	protected final PluginState state = new PluginState();
-
+	private volatile ServerSocket socket = null;
 	private volatile Socket controlSocket = null;
 	private volatile TorControlConnection controlConnection = null;
 	private volatile Settings settings = null;
 
+	protected volatile boolean running = false;
+
 	protected abstract int getProcessId();
 
 	protected abstract long getLastUpdateTime();
@@ -170,6 +159,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		configFile = new File(torDirectory, "torrc");
 		doneFile = new File(torDirectory, "done");
 		cookieFile = new File(torDirectory, ".tor/control_auth_cookie");
+		connectionStatus = new ConnectionStatus();
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor =
 				new PoliteExecutor("TorPlugin", ioExecutor, 1);
@@ -200,11 +190,13 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			}
 		}
 		// Load the settings
-		settings = migrateSettings(callback.getSettings());
+		settings = callback.getSettings();
 		// Install or update the assets if necessary
 		if (!assetsAreUpToDate()) installAssets();
 		if (cookieFile.exists() && !cookieFile.delete())
 			LOG.warning("Old auth cookie not deleted");
+		// Migrate old settings before having a chance to stop
+		migrateSettings();
 		// Start a new Tor process
 		LOG.info("Starting Tor");
 		String torPath = torFile.getAbsolutePath();
@@ -268,6 +260,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			// Tell Tor to exit when the control connection is closed
 			controlConnection.takeOwnership();
 			controlConnection.resetConf(singletonList(OWNER));
+			running = true;
 			// Register to receive events from the Tor process
 			controlConnection.setEventHandler(this);
 			controlConnection.setEvents(asList(EVENTS));
@@ -275,12 +268,11 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			String phase = controlConnection.getInfo("status/bootstrap-phase");
 			if (phase != null && phase.contains("PROGRESS=100")) {
 				LOG.info("Tor has already bootstrapped");
-				state.setBootstrapped();
+				connectionStatus.setBootstrapped();
 			}
 		} catch (IOException e) {
 			throw new PluginException(e);
 		}
-		state.setStarted();
 		// Check whether we're online
 		updateConnectionStatus(networkManager.getNetworkStatus(),
 				batteryManager.isCharging());
@@ -288,18 +280,6 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		bind();
 	}
 
-	// TODO: Remove after a reasonable migration period (added 2020-01-16)
-	private Settings migrateSettings(Settings settings) {
-		int network = settings.getInt(PREF_TOR_NETWORK,
-				PREF_TOR_NETWORK_AUTOMATIC);
-		if (network == PREF_TOR_NETWORK_NEVER) {
-			settings.putInt(PREF_TOR_NETWORK, PREF_TOR_NETWORK_AUTOMATIC);
-			settings.putBoolean(PREF_PLUGIN_ENABLE, false);
-			callback.mergeSettings(settings);
-		}
-		return settings;
-	}
-
 	private boolean assetsAreUpToDate() {
 		return doneFile.lastModified() > getLastUpdateTime();
 	}
@@ -415,11 +395,11 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				tryToClose(ss, LOG, WARNING);
 				return;
 			}
-			if (!state.setServerSocket(ss)) {
-				LOG.info("Closing redundant server socket");
+			if (!running) {
 				tryToClose(ss, LOG, WARNING);
 				return;
 			}
+			socket = ss;
 			// Store the port number
 			String localPort = String.valueOf(ss.getLocalPort());
 			Settings s = new Settings();
@@ -434,7 +414,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	private void publishHiddenService(String port) {
-		if (!state.isTorRunning()) return;
+		if (!running) return;
 		LOG.info("Creating hidden service");
 		String privKey = settings.get(HS_PRIVKEY);
 		Map<Integer, String> portLines = singletonMap(80, "127.0.0.1:" + port);
@@ -472,15 +452,14 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	private void acceptContactConnections(ServerSocket ss) {
-		while (true) {
+		while (running) {
 			Socket s;
 			try {
 				s = ss.accept();
 				s.setSoTimeout(socketTimeout);
 			} catch (IOException e) {
-				// This is expected when the server socket is closed
-				LOG.info("Server socket closed");
-				state.clearServerSocket(ss);
+				// This is expected when the socket is closed
+				if (LOG.isLoggable(INFO)) LOG.info(e.toString());
 				return;
 			}
 			LOG.info("Connection received");
@@ -490,8 +469,10 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	protected void enableNetwork(boolean enable) throws IOException {
-		state.enableNetwork(enable);
+		if (!running) return;
+		connectionStatus.enableNetwork(enable);
 		controlConnection.setConf("DisableNetwork", enable ? "0" : "1");
+		if (!enable) callback.transportDisabled();
 	}
 
 	private void enableBridges(boolean enable, boolean needsMeek)
@@ -515,8 +496,9 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 	@Override
 	public void stop() {
-		ServerSocket ss = state.setStopped();
-		tryToClose(ss, LOG, WARNING);
+		running = false;
+		tryToClose(socket, LOG, WARNING);
+		callback.transportDisabled();
 		if (controlSocket != null && controlConnection != null) {
 			try {
 				LOG.info("Stopping Tor");
@@ -530,13 +512,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public State getState() {
-		return state.getState();
-	}
-
-	@Override
-	public int getReasonsDisabled() {
-		return state.getReasonsDisabled();
+	public boolean isRunning() {
+		return running && connectionStatus.isConnected();
 	}
 
 	@Override
@@ -550,9 +527,9 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public void poll(
-			List<Pair<TransportProperties, ConnectionHandler>> properties) {
-		if (getState() != ACTIVE) return;
+	public void poll(Collection<Pair<TransportProperties, ConnectionHandler>>
+			properties) {
+		if (!isRunning()) return;
 		backoff.increment();
 		for (Pair<TransportProperties, ConnectionHandler> p : properties) {
 			connect(p.getFirst(), p.getSecond());
@@ -571,7 +548,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 	@Override
 	public DuplexTransportConnection createConnection(TransportProperties p) {
-		if (getState() != ACTIVE) return null;
+		if (!isRunning()) return null;
 		String bestOnion = null;
 		String onion2 = p.get(PROP_ONION_V2);
 		String onion3 = p.get(PROP_ONION_V3);
@@ -659,8 +636,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 								new TorTransportConnection(this, s));
 					}
 				} catch (IOException e) {
-					// This is expected when the server socket is closed
-					LOG.info("Rendezvous server socket closed");
+					// This is expected when the socket is closed
+					if (LOG.isLoggable(INFO)) LOG.info(e.toString());
 				}
 			});
 			Map<Integer, String> portLines =
@@ -685,23 +662,13 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 	}
 
-	@Override
-	public boolean supportsDiscovery() {
-		return false;
-	}
-
-	@Override
-	public void discoverPeers(
-			List<Pair<TransportProperties, DiscoveryHandler>> properties) {
-		throw new UnsupportedOperationException();
-	}
-
 	@Override
 	public void circuitStatus(String status, String id, String path) {
 		if (status.equals("BUILT") &&
-				state.getAndSetCircuitBuilt()) {
+				connectionStatus.getAndSetCircuitBuilt()) {
 			LOG.info("First circuit built");
 			backoff.reset();
+			if (isRunning()) callback.transportEnabled();
 		}
 	}
 
@@ -732,8 +699,9 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	public void message(String severity, String msg) {
 		if (LOG.isLoggable(INFO)) LOG.info(severity + " " + msg);
 		if (severity.equals("NOTICE") && msg.startsWith("Bootstrapped 100%")) {
-			state.setBootstrapped();
+			connectionStatus.setBootstrapped();
 			backoff.reset();
+			if (isRunning()) callback.transportEnabled();
 		}
 	}
 
@@ -770,7 +738,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private void disableNetwork() {
 		connectionStatusExecutor.execute(() -> {
 			try {
-				if (state.isTorRunning()) enableNetwork(false);
+				enableNetwork(false);
 			} catch (IOException ex) {
 				logException(LOG, WARNING, ex);
 			}
@@ -780,14 +748,12 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private void updateConnectionStatus(NetworkStatus status,
 			boolean charging) {
 		connectionStatusExecutor.execute(() -> {
-			if (!state.isTorRunning()) return;
+			if (!running) return;
 			boolean online = status.isConnected();
 			boolean wifi = status.isWifi();
 			String country = locationUtils.getCurrentCountry();
 			boolean blocked =
 					circumventionProvider.isTorProbablyBlocked(country);
-			boolean enabledByUser =
-					settings.getBoolean(PREF_PLUGIN_ENABLE, true);
 			int network = settings.getInt(PREF_TOR_NETWORK,
 					PREF_TOR_NETWORK_AUTOMATIC);
 			boolean useMobile = settings.getBoolean(PREF_TOR_MOBILE, true);
@@ -798,70 +764,47 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 			if (LOG.isLoggable(INFO)) {
 				LOG.info("Online: " + online + ", wifi: " + wifi);
-				if (country.isEmpty()) LOG.info("Country code unknown");
+				if ("".equals(country)) LOG.info("Country code unknown");
 				else LOG.info("Country code: " + country);
 				LOG.info("Charging: " + charging);
 			}
 
-			int reasonsDisabled = 0;
-			boolean enableNetwork = false, enableBridges = false;
-			boolean useMeek = false, enableConnectionPadding = false;
-
-			if (!online) {
-				LOG.info("Disabling network, device is offline");
-			} else {
-				if (!enabledByUser) {
-					LOG.info("User has disabled Tor");
-					reasonsDisabled |= REASON_USER;
-				}
-				if (!charging && onlyWhenCharging) {
-					LOG.info("Configured not to use battery");
-					reasonsDisabled |= REASON_BATTERY;
-				}
-				if (!useMobile && !wifi) {
-					LOG.info("Configured not to use mobile data");
-					reasonsDisabled |= REASON_MOBILE_DATA;
-				}
-				if (automatic && blocked && !bridgesWork) {
-					LOG.info("Country is blocked");
-					reasonsDisabled |= REASON_COUNTRY_BLOCKED;
-				}
-
-				if (reasonsDisabled != 0) {
-					LOG.info("Disabling network due to settings");
-				} else {
-					LOG.info("Enabling network");
-					enableNetwork = true;
-					if (network == PREF_TOR_NETWORK_WITH_BRIDGES ||
-							(automatic && bridgesWork)) {
-						if (circumventionProvider.needsMeek(country)) {
-							LOG.info("Using meek bridges");
-							enableBridges = true;
-							useMeek = true;
-						} else {
-							LOG.info("Using obfs4 bridges");
-							enableBridges = true;
-						}
-					} else {
-						LOG.info("Not using bridges");
-					}
-					if (wifi && charging) {
-						LOG.info("Enabling connection padding");
-						enableConnectionPadding = true;
-					} else {
-						LOG.info("Disabling connection padding");
-					}
-				}
-			}
-
-			state.setReasonsDisabled(reasonsDisabled);
-
 			try {
-				if (enableNetwork) {
-					enableBridges(enableBridges, useMeek);
-					enableConnectionPadding(enableConnectionPadding);
+				if (!online) {
+					LOG.info("Disabling network, device is offline");
+					enableNetwork(false);
+				} else if (!charging && onlyWhenCharging) {
+					LOG.info("Disabling network, device is on battery");
+					enableNetwork(false);
+				} else if (network == PREF_TOR_NETWORK_NEVER ||
+						(!useMobile && !wifi)) {
+					LOG.info("Disabling network, device is using mobile data");
+					enableNetwork(false);
+				} else if (automatic && blocked && !bridgesWork) {
+					LOG.info("Disabling network, country is blocked");
+					enableNetwork(false);
+				} else if (network == PREF_TOR_NETWORK_WITH_BRIDGES ||
+						(automatic && bridgesWork)) {
+					if (circumventionProvider.needsMeek(country)) {
+						LOG.info("Enabling network, using meek bridges");
+						enableBridges(true, true);
+					} else {
+						LOG.info("Enabling network, using obfs4 bridges");
+						enableBridges(true, false);
+					}
+					enableNetwork(true);
+				} else {
+					LOG.info("Enabling network, not using bridges");
+					enableBridges(false, false);
+					enableNetwork(true);
+				}
+				if (online && wifi && charging) {
+					LOG.info("Enabling connection padding");
+					enableConnectionPadding(true);
+				} else {
+					LOG.info("Disabling connection padding");
+					enableConnectionPadding(false);
 				}
-				enableNetwork(enableNetwork);
 			} catch (IOException e) {
 				logException(LOG, WARNING, e);
 			}
@@ -869,96 +812,48 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	private void enableConnectionPadding(boolean enable) throws IOException {
+		if (!running) return;
 		controlConnection.setConf("ConnectionPadding", enable ? "1" : "0");
 	}
 
-	@ThreadSafe
-	@NotNullByDefault
-	protected class PluginState {
-
-		@GuardedBy("this")
-		private boolean started = false,
-				stopped = false,
-				networkInitialised = false,
-				networkEnabled = false,
-				bootstrapped = false,
-				circuitBuilt = false,
-				settingsChecked = false;
-
-		@GuardedBy("this")
-		private int reasonsDisabled = 0;
-
-		@GuardedBy("this")
-		@Nullable
-		private ServerSocket serverSocket = null;
-
-		synchronized void setStarted() {
-			started = true;
-			callback.pluginStateChanged(getState());
+	// TODO remove when sufficient time has passed. Added 2018-08-15
+	private void migrateSettings() {
+		Settings sOld = callback.getSettings();
+		int oldNetwork = sOld.getInt("network", -1);
+		if (oldNetwork == -1) return;
+		Settings s = new Settings();
+		if (oldNetwork == 0) {
+			s.putInt(PREF_TOR_NETWORK, PREF_TOR_NETWORK_NEVER);
+		} else if (oldNetwork == 1) {
+			s.putBoolean(PREF_TOR_MOBILE, false);
 		}
+		s.putInt("network", -1);
+		callback.mergeSettings(s);
+	}
 
-		synchronized boolean isTorRunning() {
-			return started && !stopped;
-		}
+	private static class ConnectionStatus {
 
-		@Nullable
-		synchronized ServerSocket setStopped() {
-			stopped = true;
-			ServerSocket ss = serverSocket;
-			serverSocket = null;
-			callback.pluginStateChanged(getState());
-			return ss;
-		}
+		// All of the following are locking: this
+		private boolean networkEnabled = false;
+		private boolean bootstrapped = false, circuitBuilt = false;
 
-		synchronized void setBootstrapped() {
+		private synchronized void setBootstrapped() {
 			bootstrapped = true;
-			callback.pluginStateChanged(getState());
 		}
 
-		synchronized boolean getAndSetCircuitBuilt() {
+		private synchronized boolean getAndSetCircuitBuilt() {
 			boolean firstCircuit = !circuitBuilt;
 			circuitBuilt = true;
-			callback.pluginStateChanged(getState());
 			return firstCircuit;
 		}
 
-		synchronized void enableNetwork(boolean enable) {
-			networkInitialised = true;
+		private synchronized void enableNetwork(boolean enable) {
 			networkEnabled = enable;
 			if (!enable) circuitBuilt = false;
-			callback.pluginStateChanged(getState());
 		}
 
-		synchronized void setReasonsDisabled(int reasonsDisabled) {
-			settingsChecked = true;
-			this.reasonsDisabled = reasonsDisabled;
-			callback.pluginStateChanged(getState());
-		}
-
-		// Doesn't affect getState()
-		synchronized boolean setServerSocket(ServerSocket ss) {
-			if (stopped || serverSocket != null) return false;
-			serverSocket = ss;
-			return true;
-		}
-
-		// Doesn't affect getState()
-		synchronized void clearServerSocket(ServerSocket ss) {
-			if (serverSocket == ss) serverSocket = null;
-		}
-
-		synchronized State getState() {
-			if (!started || stopped || !settingsChecked) {
-				return STARTING_STOPPING;
-			}
-			if (reasonsDisabled != 0) return DISABLED;
-			if (!networkInitialised) return ENABLING;
-			if (!networkEnabled) return INACTIVE;
-			return bootstrapped && circuitBuilt ? ACTIVE : ENABLING;
-		}
-
-		synchronized int getReasonsDisabled() {
-			return getState() == DISABLED ? reasonsDisabled : 0;
+		private synchronized boolean isConnected() {
+			return networkEnabled && bootstrapped && circuitBuilt;
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/properties/TransportPropertyManagerImpl.java

@@ -284,7 +284,7 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 			meta.put("transportId", t.getString());
 			meta.put("version", version);
 			meta.put("local", local);
-			clientHelper.addLocalMessage(txn, m, meta, shared, false);
+			clientHelper.addLocalMessage(txn, m, meta, shared);
 		} catch (FormatException e) {
 			throw new RuntimeException(e);
 		}

bramble-core/src/main/java/org/briarproject/bramble/rendezvous/RendezvousPollerImpl.java

@@ -31,8 +31,8 @@ import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.rendezvous.KeyMaterialSource;
 import org.briarproject.bramble.api.rendezvous.RendezvousEndpoint;
@@ -66,7 +66,6 @@ import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.contact.PendingContactState.ADDING_CONTACT;
 import static org.briarproject.bramble.api.contact.PendingContactState.FAILED;
-import static org.briarproject.bramble.api.contact.PendingContactState.OFFLINE;
 import static org.briarproject.bramble.api.contact.PendingContactState.WAITING_FOR_CONNECTION;
 import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNull;
 import static org.briarproject.bramble.rendezvous.RendezvousConstants.POLLING_INTERVAL_MS;
@@ -159,7 +158,9 @@ class RendezvousPollerImpl implements RendezvousPoller, Service, EventListener {
 	private void addPendingContact(PendingContact p) {
 		long now = clock.currentTimeMillis();
 		long expiry = p.getTimestamp() + RENDEZVOUS_TIMEOUT_MS;
-		if (expiry <= now) {
+		if (expiry > now) {
+			broadcastState(p.getId(), WAITING_FOR_CONNECTION);
+		} else {
 			broadcastState(p.getId(), FAILED);
 			return;
 		}
@@ -179,13 +180,9 @@ class RendezvousPollerImpl implements RendezvousPoller, Service, EventListener {
 			for (PluginState ps : pluginStates.values()) {
 				RendezvousEndpoint endpoint =
 						createEndpoint(ps.plugin, p.getId(), cs);
-				if (endpoint != null) {
+				if (endpoint != null)
 					requireNull(ps.endpoints.put(p.getId(), endpoint));
-					cs.numEndpoints++;
-				}
 			}
-			if (cs.numEndpoints == 0) broadcastState(p.getId(), OFFLINE);
-			else broadcastState(p.getId(), WAITING_FOR_CONNECTION);
 		} catch (DbException | GeneralSecurityException e) {
 			logException(LOG, WARNING, e);
 		}
@@ -269,11 +266,11 @@ class RendezvousPollerImpl implements RendezvousPoller, Service, EventListener {
 		} else if (e instanceof PendingContactRemovedEvent) {
 			PendingContactRemovedEvent p = (PendingContactRemovedEvent) e;
 			removePendingContactAsync(p.getId());
-		} else if (e instanceof TransportActiveEvent) {
-			TransportActiveEvent t = (TransportActiveEvent) e;
+		} else if (e instanceof TransportEnabledEvent) {
+			TransportEnabledEvent t = (TransportEnabledEvent) e;
 			addTransportAsync(t.getTransportId());
-		} else if (e instanceof TransportInactiveEvent) {
-			TransportInactiveEvent t = (TransportInactiveEvent) e;
+		} else if (e instanceof TransportDisabledEvent) {
+			TransportDisabledEvent t = (TransportDisabledEvent) e;
 			removeTransportAsync(t.getTransportId());
 		} else if (e instanceof RendezvousConnectionOpenedEvent) {
 			RendezvousConnectionOpenedEvent r =
@@ -331,14 +328,9 @@ class RendezvousPollerImpl implements RendezvousPoller, Service, EventListener {
 		TransportId t = plugin.getId();
 		Map<PendingContactId, RendezvousEndpoint> endpoints = new HashMap<>();
 		for (Entry<PendingContactId, CryptoState> e : cryptoStates.entrySet()) {
-			PendingContactId p = e.getKey();
-			CryptoState cs = e.getValue();
-			RendezvousEndpoint endpoint = createEndpoint(plugin, p, cs);
-			if (endpoint != null) {
-				endpoints.put(p, endpoint);
-				if (++cs.numEndpoints == 1)
-					broadcastState(p, WAITING_FOR_CONNECTION);
-			}
+			RendezvousEndpoint endpoint =
+					createEndpoint(plugin, e.getKey(), e.getValue());
+			if (endpoint != null) endpoints.put(e.getKey(), endpoint);
 		}
 		requireNull(pluginStates.put(t, new PluginState(plugin, endpoints)));
 	}
@@ -352,11 +344,8 @@ class RendezvousPollerImpl implements RendezvousPoller, Service, EventListener {
 	private void removeTransport(TransportId t) {
 		PluginState ps = pluginStates.remove(t);
 		if (ps != null) {
-			for (Entry<PendingContactId, RendezvousEndpoint> e :
-					ps.endpoints.entrySet()) {
-				tryToClose(e.getValue(), LOG, INFO);
-				CryptoState cs = cryptoStates.get(e.getKey());
-				if (--cs.numEndpoints == 0) broadcastState(e.getKey(), OFFLINE);
+			for (RendezvousEndpoint endpoint : ps.endpoints.values()) {
+				tryToClose(endpoint, LOG, INFO);
 			}
 		}
 	}
@@ -402,8 +391,6 @@ class RendezvousPollerImpl implements RendezvousPoller, Service, EventListener {
 		private final boolean alice;
 		private final long expiry;
 
-		private int numEndpoints = 0;
-
 		private CryptoState(SecretKey rendezvousKey, boolean alice,
 				long expiry) {
 			this.rendezvousKey = rendezvousKey;

bramble-core/src/main/java/org/briarproject/bramble/reporting/DevReporterImpl.java

@@ -6,7 +6,7 @@ import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TorConstants;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.reporting.DevConfig;
 import org.briarproject.bramble.api.reporting.DevReporter;
 import org.briarproject.bramble.util.IoUtils;
@@ -92,8 +92,8 @@ class DevReporterImpl implements DevReporter, EventListener {
 
 	@Override
 	public void eventOccurred(Event e) {
-		if (e instanceof TransportActiveEvent) {
-			TransportActiveEvent t = (TransportActiveEvent) e;
+		if (e instanceof TransportEnabledEvent) {
+			TransportEnabledEvent t = (TransportEnabledEvent) e;
 			if (t.getTransportId().equals(TorConstants.ID))
 				ioExecutor.execute(this::sendReports);
 		}

bramble-core/src/main/java/org/briarproject/bramble/sync/DuplexOutgoingSession.java

@@ -17,7 +17,6 @@ import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Request;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.Versions;
 import org.briarproject.bramble.api.sync.event.GroupVisibilityUpdatedEvent;
 import org.briarproject.bramble.api.sync.event.MessageRequestedEvent;
 import org.briarproject.bramble.api.sync.event.MessageSharedEvent;
@@ -40,11 +39,9 @@ import javax.annotation.concurrent.ThreadSafe;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
-import static org.briarproject.bramble.api.sync.SyncConstants.SUPPORTED_VERSIONS;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
@@ -58,7 +55,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 class DuplexOutgoingSession implements SyncSession, EventListener {
 
 	private static final Logger LOG =
-			getLogger(DuplexOutgoingSession.class.getName());
+			Logger.getLogger(DuplexOutgoingSession.class.getName());
 
 	private static final ThrowingRunnable<IOException> CLOSE = () -> {
 	};
@@ -106,8 +103,6 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 	public void run() throws IOException {
 		eventBus.addListener(this);
 		try {
-			// Send our supported protocol versions
-			recordWriter.writeVersions(new Versions(SUPPORTED_VERSIONS));
 			// Start a query for each type of record
 			generateAck();
 			generateBatch();

bramble-core/src/main/java/org/briarproject/bramble/sync/IncomingSession.java

@@ -18,17 +18,14 @@ import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Request;
 import org.briarproject.bramble.api.sync.SyncRecordReader;
 import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.Versions;
 
 import java.io.IOException;
-import java.util.List;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
@@ -40,7 +37,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 class IncomingSession implements SyncSession, EventListener {
 
 	private static final Logger LOG =
-			getLogger(IncomingSession.class.getName());
+			Logger.getLogger(IncomingSession.class.getName());
 
 	private final DatabaseComponent db;
 	private final Executor dbExecutor;
@@ -83,9 +80,6 @@ class IncomingSession implements SyncSession, EventListener {
 				} else if (recordReader.hasRequest()) {
 					Request r = recordReader.readRequest();
 					dbExecutor.execute(new ReceiveRequest(r));
-				} else if (recordReader.hasVersions()) {
-					Versions v = recordReader.readVersions();
-					dbExecutor.execute(new ReceiveVersions(v));
 				} else {
 					// unknown records are ignored in RecordReader#eof()
 					throw new FormatException();
@@ -196,26 +190,4 @@ class IncomingSession implements SyncSession, EventListener {
 			}
 		}
 	}
-
-	private class ReceiveVersions implements Runnable {
-
-		private final Versions versions;
-
-		private ReceiveVersions(Versions versions) {
-			this.versions = versions;
-		}
-
-		@DatabaseExecutor
-		@Override
-		public void run() {
-			try {
-				List<Byte> supported = versions.getSupportedVersions();
-				db.transaction(false,
-						txn -> db.setSyncVersions(txn, contactId, supported));
-			} catch (DbException e) {
-				logException(LOG, WARNING, e);
-				interrupt();
-			}
-		}
-	}
 }

bramble-core/src/main/java/org/briarproject/bramble/sync/SimplexOutgoingSession.java

@@ -15,7 +15,6 @@ import org.briarproject.bramble.api.sync.Ack;
 import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.Versions;
 import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
@@ -30,11 +29,9 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
-import static org.briarproject.bramble.api.sync.SyncConstants.SUPPORTED_VERSIONS;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
@@ -47,7 +44,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 class SimplexOutgoingSession implements SyncSession, EventListener {
 
 	private static final Logger LOG =
-			getLogger(SimplexOutgoingSession.class.getName());
+			Logger.getLogger(SimplexOutgoingSession.class.getName());
 
 	private static final ThrowingRunnable<IOException> CLOSE = () -> {
 	};
@@ -83,8 +80,6 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	public void run() throws IOException {
 		eventBus.addListener(this);
 		try {
-			// Send our supported protocol versions
-			recordWriter.writeVersions(new Versions(SUPPORTED_VERSIONS));
 			// Start a query for each type of record
 			dbExecutor.execute(new GenerateAck());
 			dbExecutor.execute(new GenerateBatch());

bramble-core/src/main/java/org/briarproject/bramble/sync/SyncRecordReaderImpl.java

@@ -13,7 +13,6 @@ import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Request;
 import org.briarproject.bramble.api.sync.SyncRecordReader;
-import org.briarproject.bramble.api.sync.Versions;
 import org.briarproject.bramble.util.ByteUtils;
 
 import java.io.IOException;
@@ -27,8 +26,6 @@ import static org.briarproject.bramble.api.sync.RecordTypes.ACK;
 import static org.briarproject.bramble.api.sync.RecordTypes.MESSAGE;
 import static org.briarproject.bramble.api.sync.RecordTypes.OFFER;
 import static org.briarproject.bramble.api.sync.RecordTypes.REQUEST;
-import static org.briarproject.bramble.api.sync.RecordTypes.VERSIONS;
-import static org.briarproject.bramble.api.sync.SyncConstants.MAX_SUPPORTED_VERSIONS;
 import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.PROTOCOL_VERSION;
 
@@ -48,7 +45,7 @@ class SyncRecordReaderImpl implements SyncRecordReader {
 
 	private static boolean isKnownRecordType(byte type) {
 		return type == ACK || type == MESSAGE || type == OFFER ||
-				type == REQUEST || type == VERSIONS;
+				type == REQUEST;
 	}
 
 	private final MessageFactory messageFactory;
@@ -151,27 +148,4 @@ class SyncRecordReaderImpl implements SyncRecordReader {
 		if (!hasRequest()) throw new FormatException();
 		return new Request(readMessageIds());
 	}
-
-	@Override
-	public boolean hasVersions() throws IOException {
-		return !eof() && getNextRecordType() == VERSIONS;
-	}
-
-	@Override
-	public Versions readVersions() throws IOException {
-		if (!hasVersions()) throw new FormatException();
-		return new Versions(readSupportedVersions());
-	}
-
-	private List<Byte> readSupportedVersions() throws IOException {
-		if (nextRecord == null) throw new AssertionError();
-		byte[] payload = nextRecord.getPayload();
-		if (payload.length == 0) throw new FormatException();
-		if (payload.length > MAX_SUPPORTED_VERSIONS)
-			throw new FormatException();
-		List<Byte> supported = new ArrayList<>(payload.length);
-		for (byte b : payload) supported.add(b);
-		nextRecord = null;
-		return supported;
-	}
 }

bramble-core/src/main/java/org/briarproject/bramble/sync/SyncRecordWriterImpl.java

@@ -10,7 +10,6 @@ import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Request;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
-import org.briarproject.bramble.api.sync.Versions;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -21,7 +20,6 @@ import static org.briarproject.bramble.api.sync.RecordTypes.ACK;
 import static org.briarproject.bramble.api.sync.RecordTypes.MESSAGE;
 import static org.briarproject.bramble.api.sync.RecordTypes.OFFER;
 import static org.briarproject.bramble.api.sync.RecordTypes.REQUEST;
-import static org.briarproject.bramble.api.sync.RecordTypes.VERSIONS;
 import static org.briarproject.bramble.api.sync.SyncConstants.PROTOCOL_VERSION;
 
 @NotThreadSafe
@@ -67,12 +65,6 @@ class SyncRecordWriterImpl implements SyncRecordWriter {
 		writeRecord(REQUEST);
 	}
 
-	@Override
-	public void writeVersions(Versions v) throws IOException {
-		for (byte b : v.getSupportedVersions()) payload.write(b);
-		writeRecord(VERSIONS);
-	}
-
 	@Override
 	public void flush() throws IOException {
 		writer.flush();

bramble-core/src/main/java/org/briarproject/bramble/sync/validation/ValidationManagerImpl.java

@@ -314,7 +314,6 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			try {
 				shareMsg = hook.incomingMessage(txn, m, meta);
 			} catch (InvalidMessageException e) {
-				logException(LOG, INFO, e);
 				invalidateMessage(txn, m.getId());
 				return new DeliveryResult(false, false);
 			}

bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java

@@ -26,9 +26,7 @@ import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.validation.IncomingMessageHook;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.versioning.ClientMajorVersion;
-import org.briarproject.bramble.api.versioning.ClientVersion;
 import org.briarproject.bramble.api.versioning.ClientVersioningManager;
-import org.briarproject.bramble.api.versioning.event.ClientVersionUpdatedEvent;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -82,9 +80,9 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 	@Override
 	public void registerClient(ClientId clientId, int majorVersion,
 			int minorVersion, ClientVersioningHook hook) {
-		ClientMajorVersion cmv = new ClientMajorVersion(clientId, majorVersion);
-		clients.add(new ClientVersion(cmv, minorVersion));
-		hooks.put(cmv, hook);
+		ClientMajorVersion cv = new ClientMajorVersion(clientId, majorVersion);
+		clients.add(new ClientVersion(cv, minorVersion));
+		hooks.put(cv, hook);
 	}
 
 	@Override
@@ -98,9 +96,9 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			Update remoteUpdate = loadUpdate(txn, latest.remote.messageId);
 			Map<ClientMajorVersion, Visibility> visibilities =
 					getVisibilities(localUpdate.states, remoteUpdate.states);
-			ClientMajorVersion key =
+			ClientMajorVersion cv =
 					new ClientMajorVersion(clientId, majorVersion);
-			Visibility v = visibilities.get(key);
+			Visibility v = visibilities.get(cv);
 			return v == null ? INVISIBLE : v;
 		} catch (FormatException e) {
 			throw new DbException(e);
@@ -114,11 +112,10 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			LatestUpdates latest = findLatestUpdates(txn, contactId);
 			if (latest == null || latest.remote == null) return -1;
 			Update remoteUpdate = loadUpdate(txn, latest.remote.messageId);
-			ClientMajorVersion key =
+			ClientMajorVersion cv =
 					new ClientMajorVersion(clientId, majorVersion);
 			for (ClientState remote : remoteUpdate.states) {
-				if (remote.clientVersion.getClientMajorVersion().equals(key))
-					return remote.clientVersion.getMinorVersion();
+				if (remote.majorVersion.equals(cv)) return remote.minorVersion;
 			}
 			return -1;
 		} catch (FormatException e) {
@@ -229,21 +226,9 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			Map<ClientMajorVersion, Visibility> after =
 					getVisibilities(newLocalStates, newRemoteStates);
 			// Call hooks for any visibilities that have changed
-			ContactId c = getContactId(txn, m.getGroupId());
 			if (!before.equals(after)) {
-				Contact contact = db.getContact(txn, c);
-				callVisibilityHooks(txn, contact, before, after);
-			}
-			// Broadcast events for any new client versions
-			Set<ClientVersion> oldRemoteVersions = new HashSet<>();
-			for (ClientState cs : oldRemoteStates) {
-				oldRemoteVersions.add(cs.clientVersion);
-			}
-			for (ClientState cs : newRemoteStates) {
-				if (!oldRemoteVersions.contains(cs.clientVersion)) {
-					txn.attach(new ClientVersionUpdatedEvent(c,
-							cs.clientVersion));
-				}
+				Contact c = getContact(txn, m.getGroupId());
+				callVisibilityHooks(txn, c, before, after);
 			}
 		} catch (FormatException e) {
 			throw new InvalidMessageException(e);
@@ -258,7 +243,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		try {
 			Message m = clientHelper.createMessage(localGroup.getId(), now,
 					body);
-			db.addLocalMessage(txn, m, new Metadata(), false, false);
+			db.addLocalMessage(txn, m, new Metadata(), false);
 		} catch (FormatException e) {
 			throw new AssertionError(e);
 		}
@@ -271,8 +256,8 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 	}
 
 	private BdfList encodeClientVersion(ClientVersion cv) {
-		return BdfList.of(cv.getClientId().getString(), cv.getMajorVersion(),
-				cv.getMinorVersion());
+		return BdfList.of(cv.majorVersion.getClientId().getString(),
+				cv.majorVersion.getMajorVersion(), cv.minorVersion);
 	}
 
 	/**
@@ -313,7 +298,8 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			ClientId clientId = new ClientId(cv.getString(0));
 			int majorVersion = cv.getLong(1).intValue();
 			int minorVersion = cv.getLong(2).intValue();
-			parsed.add(new ClientVersion(clientId, majorVersion, minorVersion));
+			parsed.add(new ClientVersion(clientId, majorVersion,
+					minorVersion));
 		}
 		return parsed;
 	}
@@ -432,15 +418,13 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 	private List<ClientState> updateStatesFromLocalVersions(
 			List<ClientState> oldStates, List<ClientVersion> newVersions) {
 		Map<ClientMajorVersion, ClientState> oldMap = new HashMap<>();
-		for (ClientState cs : oldStates) {
-			oldMap.put(cs.clientVersion.getClientMajorVersion(), cs);
-		}
+		for (ClientState cs : oldStates) oldMap.put(cs.majorVersion, cs);
 		List<ClientState> newStates = new ArrayList<>(newVersions.size());
 		for (ClientVersion newVersion : newVersions) {
-			ClientMajorVersion key = newVersion.getClientMajorVersion();
-			ClientState oldState = oldMap.get(key);
+			ClientState oldState = oldMap.get(newVersion.majorVersion);
 			boolean active = oldState != null && oldState.active;
-			newStates.add(new ClientState(newVersion, active));
+			newStates.add(new ClientState(newVersion.majorVersion,
+					newVersion.minorVersion, active));
 		}
 		return newStates;
 	}
@@ -454,7 +438,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			BdfDictionary meta = new BdfDictionary();
 			meta.put(MSG_KEY_UPDATE_VERSION, updateVersion);
 			meta.put(MSG_KEY_LOCAL, true);
-			clientHelper.addLocalMessage(txn, m, meta, true, false);
+			clientHelper.addLocalMessage(txn, m, meta, true);
 		} catch (FormatException e) {
 			throw new RuntimeException(e);
 		}
@@ -467,25 +451,21 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 	}
 
 	private BdfList encodeClientState(ClientState cs) {
-		ClientVersion cv = cs.clientVersion;
-		return BdfList.of(cv.getClientId().getString(), cv.getMajorVersion(),
-				cv.getMinorVersion(), cs.active);
+		return BdfList.of(cs.majorVersion.getClientId().getString(),
+				cs.majorVersion.getMajorVersion(), cs.minorVersion, cs.active);
 	}
 
 	private Map<ClientMajorVersion, Visibility> getVisibilities(
 			List<ClientState> localStates, List<ClientState> remoteStates) {
 		Map<ClientMajorVersion, ClientState> remoteMap = new HashMap<>();
-		for (ClientState cs : remoteStates) {
-			remoteMap.put(cs.clientVersion.getClientMajorVersion(), cs);
-		}
+		for (ClientState cs : remoteStates) remoteMap.put(cs.majorVersion, cs);
 		Map<ClientMajorVersion, Visibility> visibilities = new HashMap<>();
 		for (ClientState local : localStates) {
-			ClientMajorVersion key =
-					local.clientVersion.getClientMajorVersion();
-			ClientState remote = remoteMap.get(key);
-			if (remote == null) visibilities.put(key, INVISIBLE);
-			else if (remote.active) visibilities.put(key, SHARED);
-			else visibilities.put(key, VISIBLE);
+			ClientState remote = remoteMap.get(local.majorVersion);
+			if (remote == null) visibilities.put(local.majorVersion, INVISIBLE);
+			else if (remote.active)
+				visibilities.put(local.majorVersion, SHARED);
+			else visibilities.put(local.majorVersion, VISIBLE);
 		}
 		return visibilities;
 	}
@@ -506,9 +486,9 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		}
 	}
 
-	private void callVisibilityHook(Transaction txn, ClientMajorVersion cmv,
+	private void callVisibilityHook(Transaction txn, ClientMajorVersion cv,
 			Contact c, Visibility v) throws DbException {
-		ClientVersioningHook hook = hooks.get(cmv);
+		ClientVersioningHook hook = hooks.get(cv);
 		if (hook != null) hook.onClientVisibilityChanging(txn, c, v);
 	}
 
@@ -516,17 +496,18 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			List<ClientVersion> versions) throws DbException {
 		List<ClientState> states = new ArrayList<>(versions.size());
 		for (ClientVersion cv : versions) {
-			states.add(new ClientState(cv, false));
+			states.add(new ClientState(cv.majorVersion, cv.minorVersion,
+					false));
 		}
 		storeUpdate(txn, g, states, 1);
 	}
 
-	private ContactId getContactId(Transaction txn, GroupId g)
-			throws DbException {
+	private Contact getContact(Transaction txn, GroupId g) throws DbException {
 		try {
 			BdfDictionary meta =
 					clientHelper.getGroupMetadataAsDictionary(txn, g);
-			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
+			int id = meta.getLong(GROUP_KEY_CONTACT_ID).intValue();
+			return db.getContact(txn, new ContactId(id));
 		} catch (FormatException e) {
 			throw new DbException(e);
 		}
@@ -535,16 +516,13 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 	private List<ClientState> updateStatesFromRemoteStates(
 			List<ClientState> oldLocalStates, List<ClientState> remoteStates) {
 		Set<ClientMajorVersion> remoteSet = new HashSet<>();
-		for (ClientState cs : remoteStates) {
-			remoteSet.add(cs.clientVersion.getClientMajorVersion());
-		}
+		for (ClientState cs : remoteStates) remoteSet.add(cs.majorVersion);
 		List<ClientState> newLocalStates =
 				new ArrayList<>(oldLocalStates.size());
 		for (ClientState oldState : oldLocalStates) {
-			ClientMajorVersion cmv =
-					oldState.clientVersion.getClientMajorVersion();
-			boolean active = remoteSet.contains(cmv);
-			newLocalStates.add(new ClientState(oldState.clientVersion, active));
+			boolean active = remoteSet.contains(oldState.majorVersion);
+			newLocalStates.add(new ClientState(oldState.majorVersion,
+					oldState.minorVersion, active));
 		}
 		return newLocalStates;
 	}
@@ -583,19 +561,61 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		}
 	}
 
+	private static class ClientVersion implements Comparable<ClientVersion> {
+
+		private final ClientMajorVersion majorVersion;
+		private final int minorVersion;
+
+		private ClientVersion(ClientMajorVersion majorVersion,
+				int minorVersion) {
+			this.majorVersion = majorVersion;
+			this.minorVersion = minorVersion;
+		}
+
+		private ClientVersion(ClientId clientId, int majorVersion,
+				int minorVersion) {
+			this(new ClientMajorVersion(clientId, majorVersion), minorVersion);
+		}
+
+		@Override
+		public boolean equals(Object o) {
+			if (o instanceof ClientVersion) {
+				ClientVersion cv = (ClientVersion) o;
+				return majorVersion.equals(cv.majorVersion)
+						&& minorVersion == cv.minorVersion;
+			}
+			return false;
+		}
+
+		@Override
+		public int hashCode() {
+			return majorVersion.hashCode();
+		}
+
+		@Override
+		public int compareTo(ClientVersion cv) {
+			int compare = majorVersion.compareTo(cv.majorVersion);
+			if (compare != 0) return compare;
+			return minorVersion - cv.minorVersion;
+		}
+	}
+
 	private static class ClientState {
 
-		private final ClientVersion clientVersion;
+		private final ClientMajorVersion majorVersion;
+		private final int minorVersion;
 		private final boolean active;
 
-		private ClientState(ClientVersion clientVersion, boolean active) {
-			this.clientVersion = clientVersion;
+		private ClientState(ClientMajorVersion majorVersion, int minorVersion,
+				boolean active) {
+			this.majorVersion = majorVersion;
+			this.minorVersion = minorVersion;
 			this.active = active;
 		}
 
 		private ClientState(ClientId clientId, int majorVersion,
 				int minorVersion, boolean active) {
-			this(new ClientVersion(clientId, majorVersion, minorVersion),
+			this(new ClientMajorVersion(clientId, majorVersion), minorVersion,
 					active);
 		}
 
@@ -603,7 +623,8 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		public boolean equals(Object o) {
 			if (o instanceof ClientState) {
 				ClientState cs = (ClientState) o;
-				return clientVersion.equals(cs.clientVersion)
+				return majorVersion.equals(cs.majorVersion)
+						&& minorVersion == cs.minorVersion
 						&& active == cs.active;
 			}
 			return false;
@@ -611,7 +632,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 
 		@Override
 		public int hashCode() {
-			return clientVersion.hashCode();
+			return majorVersion.hashCode();
 		}
 	}
 }

bramble-core/src/test/java/org/briarproject/bramble/account/AccountManagerImplTest.java

@@ -1,7 +1,6 @@
 package org.briarproject.bramble.account;
 
 import org.briarproject.bramble.api.crypto.CryptoComponent;
-import org.briarproject.bramble.api.crypto.KeyStrengthener;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.identity.Identity;
@@ -40,8 +39,6 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 
 	private final DatabaseConfig databaseConfig =
 			context.mock(DatabaseConfig.class);
-	private final KeyStrengthener keyStrengthener =
-			context.mock(KeyStrengthener.class);
 	private final CryptoComponent crypto = context.mock(CryptoComponent.class);
 	private final IdentityManager identityManager =
 			context.mock(IdentityManager.class);
@@ -71,8 +68,6 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 			will(returnValue(dbDir));
 			allowing(databaseConfig).getDatabaseKeyDirectory();
 			will(returnValue(keyDir));
-			allowing(databaseConfig).getKeyStrengthener();
-			will(returnValue(keyStrengthener));
 		}});
 
 		accountManager =
@@ -94,8 +89,7 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 	@Test
 	public void testSignInReturnsFalseIfPasswordIsWrong() throws Exception {
 		context.checking(new Expectations() {{
-			oneOf(crypto).decryptWithPassword(encryptedKey, password,
-					keyStrengthener);
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
 			will(returnValue(null));
 		}});
 
@@ -115,11 +109,8 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 	@Test
 	public void testSignInReturnsTrueIfPasswordIsRight() throws Exception {
 		context.checking(new Expectations() {{
-			oneOf(crypto).decryptWithPassword(encryptedKey, password,
-					keyStrengthener);
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
 			will(returnValue(key.getBytes()));
-			oneOf(crypto).isEncryptedWithStrengthenedKey(encryptedKey);
-			will(returnValue(true));
 		}});
 
 		storeDatabaseKey(keyFile, encryptedKeyHex);
@@ -138,35 +129,6 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
 	}
 
-	@Test
-	public void testSignInReEncryptsKey() throws Exception {
-		context.checking(new Expectations() {{
-			oneOf(crypto).decryptWithPassword(encryptedKey, password,
-					keyStrengthener);
-			will(returnValue(key.getBytes()));
-			oneOf(crypto).isEncryptedWithStrengthenedKey(encryptedKey);
-			will(returnValue(false));
-			oneOf(crypto).encryptWithPassword(key.getBytes(), password,
-					keyStrengthener);
-			will(returnValue(newEncryptedKey));
-		}});
-
-		storeDatabaseKey(keyFile, encryptedKeyHex);
-		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
-
-		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
-		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
-
-		assertTrue(accountManager.signIn(password));
-		assertTrue(accountManager.hasDatabaseKey());
-		SecretKey decrypted = accountManager.getDatabaseKey();
-		assertNotNull(decrypted);
-		assertArrayEquals(key.getBytes(), decrypted.getBytes());
-
-		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyFile));
-		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyBackupFile));
-	}
-
 	@Test
 	public void testDbKeyIsLoadedFromPrimaryFile() throws Exception {
 		storeDatabaseKey(keyFile, encryptedKeyHex);
@@ -296,8 +258,7 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 			oneOf(identityManager).registerIdentity(identity);
 			oneOf(crypto).generateSecretKey();
 			will(returnValue(key));
-			oneOf(crypto).encryptWithPassword(key.getBytes(), password,
-					keyStrengthener);
+			oneOf(crypto).encryptWithPassword(key.getBytes(), password);
 			will(returnValue(encryptedKey));
 		}});
 
@@ -326,8 +287,7 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 	public void testChangePasswordReturnsFalseIfPasswordIsWrong()
 			throws Exception {
 		context.checking(new Expectations() {{
-			oneOf(crypto).decryptWithPassword(encryptedKey, password,
-					keyStrengthener);
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
 			will(returnValue(null));
 		}});
 
@@ -344,13 +304,9 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 	public void testChangePasswordReturnsTrueIfPasswordIsRight()
 			throws Exception {
 		context.checking(new Expectations() {{
-			oneOf(crypto).decryptWithPassword(encryptedKey, password,
-					keyStrengthener);
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
 			will(returnValue(key.getBytes()));
-			oneOf(crypto).isEncryptedWithStrengthenedKey(encryptedKey);
-			will(returnValue(true));
-			oneOf(crypto).encryptWithPassword(key.getBytes(), newPassword,
-					keyStrengthener);
+			oneOf(crypto).encryptWithPassword(key.getBytes(), newPassword);
 			will(returnValue(newEncryptedKey));
 		}});
 

bramble-core/src/test/java/org/briarproject/bramble/client/ClientHelperImplTest.java

@@ -96,7 +96,7 @@ public class ClientHelperImplTest extends BrambleTestCase {
 			oneOf(db).transaction(with(false), withDbRunnable(txn));
 			oneOf(metadataEncoder).encode(dictionary);
 			will(returnValue(metadata));
-			oneOf(db).addLocalMessage(txn, message, metadata, shared, false);
+			oneOf(db).addLocalMessage(txn, message, metadata, shared);
 		}});
 
 		clientHelper.addLocalMessage(message, dictionary, shared);

bramble-core/src/test/java/org/briarproject/bramble/contact/ContactExchangeIntegrationTest.java

@@ -1,21 +1,16 @@
 package org.briarproject.bramble.contact;
 
-import org.briarproject.bramble.BrambleCoreEagerSingletons;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.contact.PendingContact;
 import org.briarproject.bramble.api.contact.PendingContactState;
 import org.briarproject.bramble.api.contact.event.ContactAddedEvent;
-import org.briarproject.bramble.api.contact.event.PendingContactStateChangedEvent;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.crypto.SecretKey;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.identity.Identity;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.briarproject.bramble.test.TestDatabaseConfigModule;
 import org.briarproject.bramble.test.TestDuplexTransportConnection;
@@ -32,7 +27,7 @@ import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static junit.framework.TestCase.assertNotNull;
 import static junit.framework.TestCase.assertNull;
 import static junit.framework.TestCase.fail;
-import static org.briarproject.bramble.api.contact.PendingContactState.OFFLINE;
+import static org.briarproject.bramble.api.contact.PendingContactState.WAITING_FOR_CONNECTION;
 import static org.briarproject.bramble.test.TestDuplexTransportConnection.createPair;
 import static org.briarproject.bramble.test.TestPluginConfigModule.DUPLEX_TRANSPORT_ID;
 import static org.briarproject.bramble.test.TestUtils.deleteTestDirectory;
@@ -62,11 +57,11 @@ public class ContactExchangeIntegrationTest extends BrambleTestCase {
 		alice = DaggerContactExchangeIntegrationTestComponent.builder()
 				.testDatabaseConfigModule(
 						new TestDatabaseConfigModule(aliceDir)).build();
-		BrambleCoreEagerSingletons.Helper.injectEagerSingletons(alice);
+		alice.injectBrambleCoreEagerSingletons();
 		bob = DaggerContactExchangeIntegrationTestComponent.builder()
 				.testDatabaseConfigModule(new TestDatabaseConfigModule(bobDir))
 				.build();
-		BrambleCoreEagerSingletons.Helper.injectEagerSingletons(bob);
+		bob.injectBrambleCoreEagerSingletons();
 		// Set up the devices and get the identities
 		aliceIdentity = setUp(alice, "Alice");
 		bobIdentity = setUp(bob, "Bob");
@@ -193,14 +188,9 @@ public class ContactExchangeIntegrationTest extends BrambleTestCase {
 	private PendingContact addPendingContact(
 			ContactExchangeIntegrationTestComponent local,
 			ContactExchangeIntegrationTestComponent remote) throws Exception {
-		EventWaiter waiter = new EventWaiter();
-		local.getEventBus().addListener(waiter);
 		String link = remote.getContactManager().getHandshakeLink();
 		String alias = remote.getIdentityManager().getLocalAuthor().getName();
-		PendingContact pendingContact =
-				local.getContactManager().addPendingContact(link, alias);
-		waiter.latch.await(TIMEOUT, MILLISECONDS);
-		return pendingContact;
+		return local.getContactManager().addPendingContact(link, alias);
 	}
 
 	private void assertContacts(boolean verified,
@@ -247,7 +237,7 @@ public class ContactExchangeIntegrationTest extends BrambleTestCase {
 		assertEquals(1, pairs.size());
 		Pair<PendingContact, PendingContactState> pair =
 				pairs.iterator().next();
-		assertEquals(OFFLINE, pair.getSecond());
+		assertEquals(WAITING_FOR_CONNECTION, pair.getSecond());
 		PendingContact pendingContact = pair.getFirst();
 		assertEquals(expectedIdentity.getLocalAuthor().getName(),
 				pendingContact.getAlias());
@@ -271,19 +261,4 @@ public class ContactExchangeIntegrationTest extends BrambleTestCase {
 		tearDown(bob);
 		deleteTestDirectory(testDir);
 	}
-
-	@NotNullByDefault
-	private static class EventWaiter implements EventListener {
-
-		private final CountDownLatch latch = new CountDownLatch(1);
-
-		@Override
-		public void eventOccurred(Event e) {
-			if (e instanceof PendingContactStateChangedEvent) {
-				PendingContactStateChangedEvent p =
-						(PendingContactStateChangedEvent) e;
-				if (p.getPendingContactState() == OFFLINE) latch.countDown();
-			}
-		}
-	}
 }

bramble-core/src/test/java/org/briarproject/bramble/crypto/PasswordBasedEncryptionTest.java

@@ -21,8 +21,8 @@ public class PasswordBasedEncryptionTest extends BrambleTestCase {
 	public void testEncryptionAndDecryption() {
 		byte[] input = TestUtils.getRandomBytes(1234);
 		String password = "password";
-		byte[] ciphertext = crypto.encryptWithPassword(input, password, null);
-		byte[] output = crypto.decryptWithPassword(ciphertext, password, null);
+		byte[] ciphertext = crypto.encryptWithPassword(input, password);
+		byte[] output = crypto.decryptWithPassword(ciphertext, password);
 		assertArrayEquals(input, output);
 	}
 
@@ -30,11 +30,11 @@ public class PasswordBasedEncryptionTest extends BrambleTestCase {
 	public void testInvalidCiphertextReturnsNull() {
 		byte[] input = TestUtils.getRandomBytes(1234);
 		String password = "password";
-		byte[] ciphertext = crypto.encryptWithPassword(input, password, null);
+		byte[] ciphertext = crypto.encryptWithPassword(input, password);
 		// Modify the ciphertext
 		int position = new Random().nextInt(ciphertext.length);
 		ciphertext[position] = (byte) (ciphertext[position] ^ 0xFF);
-		byte[] output = crypto.decryptWithPassword(ciphertext, password, null);
+		byte[] output = crypto.decryptWithPassword(ciphertext, password);
 		assertNull(output);
 	}
 }

bramble-core/src/test/java/org/briarproject/bramble/crypto/ScryptKdfTest.java

@@ -4,7 +4,6 @@ import org.briarproject.bramble.api.Bytes;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.system.SystemClock;
-import org.briarproject.bramble.test.ArrayClock;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;
 
@@ -12,6 +11,8 @@ import java.util.HashSet;
 import java.util.Set;
 
 import static junit.framework.TestCase.assertTrue;
+
+import org.briarproject.bramble.test.ArrayClock;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 import static org.junit.Assert.assertEquals;

bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseComponentImplTest.java

@@ -61,12 +61,10 @@ import org.junit.Test;
 
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Random;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicReference;
 
 import static java.util.Arrays.asList;
-import static java.util.Collections.emptyList;
 import static java.util.Collections.emptyMap;
 import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
@@ -122,9 +120,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 	private final Contact contact;
 	private final KeySetId keySetId;
 	private final PendingContactId pendingContactId;
-	private final Random random = new Random();
-	private final boolean shared = random.nextBoolean();
-	private final boolean temporary = random.nextBoolean();
 
 	public DatabaseComponentImplTest() {
 		clientId = getClientId();
@@ -258,8 +253,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 				eventExecutor, shutdownManager);
 
 		db.transaction(false, transaction ->
-				db.addLocalMessage(transaction, message, metadata, shared,
-						temporary));
+				db.addLocalMessage(transaction, message, metadata, true));
 	}
 
 	@Test
@@ -271,23 +265,20 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			will(returnValue(true));
 			oneOf(database).containsMessage(txn, messageId);
 			will(returnValue(false));
-			oneOf(database).addMessage(txn, message, DELIVERED, shared,
-					temporary, null);
+			oneOf(database).addMessage(txn, message, DELIVERED, true, null);
 			oneOf(database).mergeMessageMetadata(txn, messageId, metadata);
 			oneOf(database).commitTransaction(txn);
 			// The message was added, so the listeners should be called
 			oneOf(eventBus).broadcast(with(any(MessageAddedEvent.class)));
-			oneOf(eventBus).broadcast(with(any(
-					MessageStateChangedEvent.class)));
-			if (shared)
-				oneOf(eventBus).broadcast(with(any(MessageSharedEvent.class)));
+			oneOf(eventBus)
+					.broadcast(with(any(MessageStateChangedEvent.class)));
+			oneOf(eventBus).broadcast(with(any(MessageSharedEvent.class)));
 		}});
 		DatabaseComponent db = createDatabaseComponent(database, eventBus,
 				eventExecutor, shutdownManager);
 
 		db.transaction(false, transaction ->
-				db.addLocalMessage(transaction, message, metadata, shared,
-						temporary));
+				db.addLocalMessage(transaction, message, metadata, true));
 	}
 
 	@Test
@@ -295,11 +286,11 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			throws Exception {
 		context.checking(new Expectations() {{
 			// Check whether the contact is in the DB (which it's not)
-			exactly(18).of(database).startTransaction();
+			exactly(16).of(database).startTransaction();
 			will(returnValue(txn));
-			exactly(18).of(database).containsContact(txn, contactId);
+			exactly(16).of(database).containsContact(txn, contactId);
 			will(returnValue(false));
-			exactly(18).of(database).abortTransaction(txn);
+			exactly(16).of(database).abortTransaction(txn);
 		}});
 		DatabaseComponent db = createDatabaseComponent(database, eventBus,
 				eventExecutor, shutdownManager);
@@ -377,14 +368,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			// Expected
 		}
 
-		try {
-			db.transaction(false, transaction ->
-					db.getSyncVersions(transaction, contactId));
-			fail();
-		} catch (NoSuchContactException expected) {
-			// Expected
-		}
-
 		try {
 			Ack a = new Ack(singletonList(messageId));
 			db.transaction(false, transaction ->
@@ -444,14 +427,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		} catch (NoSuchContactException expected) {
 			// Expected
 		}
-
-		try {
-			db.transaction(false, transaction ->
-					db.setSyncVersions(transaction, contactId, emptyList()));
-			fail();
-		} catch (NoSuchContactException expected) {
-			// Expected
-		}
 	}
 
 	@Test
@@ -594,11 +569,11 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			throws Exception {
 		context.checking(new Expectations() {{
 			// Check whether the message is in the DB (which it's not)
-			exactly(12).of(database).startTransaction();
+			exactly(11).of(database).startTransaction();
 			will(returnValue(txn));
-			exactly(12).of(database).containsMessage(txn, messageId);
+			exactly(11).of(database).containsMessage(txn, messageId);
 			will(returnValue(false));
-			exactly(12).of(database).abortTransaction(txn);
+			exactly(11).of(database).abortTransaction(txn);
 			// Allow other checks to pass
 			allowing(database).containsContact(txn, contactId);
 			will(returnValue(true));
@@ -662,14 +637,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			// Expected
 		}
 
-		try {
-			db.transaction(false, transaction ->
-					db.setMessagePermanent(transaction, message.getId()));
-			fail();
-		} catch (NoSuchMessageException expected) {
-			// Expected
-		}
-
 		try {
 			db.transaction(false, transaction ->
 					db.setMessageShared(transaction, message.getId()));
@@ -1005,8 +972,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			will(returnValue(VISIBLE));
 			oneOf(database).containsMessage(txn, messageId);
 			will(returnValue(false));
-			oneOf(database).addMessage(txn, message, UNKNOWN, false, false,
-					contactId);
+			oneOf(database).addMessage(txn, message, UNKNOWN, false, contactId);
 			// Second time
 			oneOf(database).containsContact(txn, contactId);
 			will(returnValue(true));
@@ -1541,7 +1507,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 	public void testMessageDependencies() throws Exception {
 		int shutdownHandle = 12345;
 		MessageId messageId2 = new MessageId(getRandomId());
-
 		context.checking(new Expectations() {{
 			// open()
 			oneOf(database).open(key, null);
@@ -1556,8 +1521,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			will(returnValue(true));
 			oneOf(database).containsMessage(txn, messageId);
 			will(returnValue(false));
-			oneOf(database).addMessage(txn, message, DELIVERED, shared,
-					temporary, null);
+			oneOf(database).addMessage(txn, message, DELIVERED, true, null);
 			oneOf(database).mergeMessageMetadata(txn, messageId, metadata);
 			// addMessageDependencies()
 			oneOf(database).containsMessage(txn, messageId);
@@ -1580,8 +1544,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			oneOf(eventBus).broadcast(with(any(MessageAddedEvent.class)));
 			oneOf(eventBus).broadcast(with(any(
 					MessageStateChangedEvent.class)));
-			if (shared)
-				oneOf(eventBus).broadcast(with(any(MessageSharedEvent.class)));
+			oneOf(eventBus).broadcast(with(any(MessageSharedEvent.class)));
 			// endTransaction()
 			oneOf(database).commitTransaction(txn);
 			// close()
@@ -1592,8 +1555,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 
 		assertFalse(db.open(key, null));
 		db.transaction(false, transaction -> {
-			db.addLocalMessage(transaction, message, metadata, shared,
-					temporary);
+			db.addLocalMessage(transaction, message, metadata, true);
 			Collection<MessageId> dependencies = new ArrayList<>(2);
 			dependencies.add(messageId1);
 			dependencies.add(messageId2);

bramble-core/src/test/java/org/briarproject/bramble/db/DatabasePerformanceTest.java

@@ -567,9 +567,8 @@ public abstract class DatabasePerformanceTest extends BrambleTestCase {
 					MessageState state =
 							MessageState.fromValue(random.nextInt(4));
 					boolean shared = random.nextBoolean();
-					boolean temporary = random.nextBoolean();
 					ContactId sender = random.nextBoolean() ? c : null;
-					db.addMessage(txn, m, state, shared, temporary, sender);
+					db.addMessage(txn, m, state, shared, sender);
 					if (random.nextBoolean())
 						db.raiseRequestedFlag(txn, c, m.getId());
 					Metadata mm = getMetadata(METADATA_KEYS_PER_MESSAGE);
@@ -598,8 +597,7 @@ public abstract class DatabasePerformanceTest extends BrambleTestCase {
 			for (int j = 0; j < MESSAGES_PER_GROUP; j++) {
 				Message m = getMessage(g.getId());
 				messages.add(m);
-				boolean temporary = random.nextBoolean();
-				db.addMessage(txn, m, DELIVERED, false, temporary, null);
+				db.addMessage(txn, m, DELIVERED, false, null);
 				Metadata mm = getMetadata(METADATA_KEYS_PER_MESSAGE);
 				messageMeta.get(g.getId()).add(mm);
 				db.mergeMessageMetadata(txn, m.getId(), mm);

bramble-core/src/test/java/org/briarproject/bramble/db/JdbcDatabaseTest.java

@@ -34,7 +34,6 @@ import org.briarproject.bramble.test.BrambleTestCase;
 import org.briarproject.bramble.test.SettableClock;
 import org.briarproject.bramble.test.TestDatabaseConfig;
 import org.briarproject.bramble.test.TestMessageFactory;
-import org.briarproject.bramble.test.TestUtils;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -42,6 +41,7 @@ import org.junit.Test;
 import java.io.File;
 import java.sql.Connection;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -51,7 +51,6 @@ import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicLong;
 
-import static java.util.Arrays.asList;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.emptyMap;
 import static java.util.Collections.singletonList;
@@ -154,7 +153,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		db.addGroup(txn, group);
 		assertTrue(db.containsGroup(txn, groupId));
 		assertFalse(db.containsMessage(txn, messageId));
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 		assertTrue(db.containsMessage(txn, messageId));
 		db.commitTransaction(txn);
 		db.close();
@@ -192,7 +191,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and a message
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// Removing the group should remove the message
 		assertTrue(db.containsMessage(txn, messageId));
@@ -214,7 +213,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// The contact has not seen the message, so it should be sendable
 		Collection<MessageId> ids =
@@ -245,7 +244,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, UNKNOWN, true, false, null);
+		db.addMessage(txn, message, UNKNOWN, true, null);
 
 		// The message has not been validated, so it should not be sendable
 		Collection<MessageId> ids = db.getMessagesToSend(txn, contactId,
@@ -289,7 +288,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		assertEquals(contactId,
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// The group is invisible, so the message should not be sendable
 		Collection<MessageId> ids = db.getMessagesToSend(txn, contactId,
@@ -341,7 +340,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, false, false, null);
+		db.addMessage(txn, message, DELIVERED, false, null);
 
 		// The message is not shared, so it should not be sendable
 		Collection<MessageId> ids = db.getMessagesToSend(txn, contactId,
@@ -372,7 +371,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// The message is sendable, but too large to send
 		Collection<MessageId> ids =
@@ -403,15 +402,15 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		// Add some messages to ack
 		Message message1 = getMessage(groupId);
 		MessageId messageId1 = message1.getId();
-		db.addMessage(txn, message, DELIVERED, true, false, contactId);
-		db.addMessage(txn, message1, DELIVERED, true, false, contactId);
+		db.addMessage(txn, message, DELIVERED, true, contactId);
+		db.addMessage(txn, message1, DELIVERED, true, contactId);
 
 		// Both message IDs should be returned
 		Collection<MessageId> ids = db.getMessagesToAck(txn, contactId, 1234);
-		assertEquals(asList(messageId, messageId1), ids);
+		assertEquals(Arrays.asList(messageId, messageId1), ids);
 
 		// Remove both message IDs
-		db.lowerAckFlag(txn, contactId, asList(messageId, messageId1));
+		db.lowerAckFlag(txn, contactId, Arrays.asList(messageId, messageId1));
 
 		// Both message IDs should have been removed
 		assertEquals(emptyList(), db.getMessagesToAck(txn,
@@ -423,7 +422,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Both message IDs should be returned
 		ids = db.getMessagesToAck(txn, contactId, 1234);
-		assertEquals(asList(messageId, messageId1), ids);
+		assertEquals(Arrays.asList(messageId, messageId1), ids);
 
 		db.commitTransaction(txn);
 		db.close();
@@ -440,7 +439,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// Retrieve the message from the database and mark it as sent
 		Collection<MessageId> ids = db.getMessagesToSend(txn, contactId,
@@ -609,7 +608,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		assertEquals(contactId,
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// The group is not visible so the message should not be visible
 		assertFalse(db.containsVisibleMessage(txn, contactId, messageId));
@@ -1150,43 +1149,6 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		db.close();
 	}
 
-	@Test
-	public void testGetContactsByHandshakePublicKey() throws Exception {
-		Database<Connection> db = open(false);
-		Connection txn = db.startTransaction();
-
-		// Add an identity for a local author - no contacts should be
-		// associated
-		db.addIdentity(txn, identity);
-		PublicKey handshakePublicKey = TestUtils.getSignaturePublicKey();
-		Contact contact =
-				db.getContact(txn, handshakePublicKey, localAuthor.getId());
-		assertNull(contact);
-
-		// Add a contact associated with the local author
-		assertEquals(contactId, db.addContact(txn, author, localAuthor.getId(),
-				handshakePublicKey, true));
-		contact = db.getContact(txn, handshakePublicKey, localAuthor.getId());
-		assertNotNull(contact);
-		assertEquals(contactId, contact.getId());
-		assertEquals(author, contact.getAuthor());
-		assertNull(contact.getAlias());
-		assertEquals(handshakePublicKey, contact.getHandshakePublicKey());
-		assertTrue(contact.isVerified());
-		assertEquals(author.getName(), contact.getAuthor().getName());
-		assertEquals(author.getPublicKey(), contact.getAuthor().getPublicKey());
-		assertEquals(author.getFormatVersion(),
-				contact.getAuthor().getFormatVersion());
-
-		// Ensure no contacts are returned after contact was deleted
-		db.removeContact(txn, contactId);
-		contact = db.getContact(txn, handshakePublicKey, localAuthor.getId());
-		assertNull(contact);
-
-		db.commitTransaction(txn);
-		db.close();
-	}
-
 	@Test
 	public void testOfferedMessages() throws Exception {
 		Database<Connection> db = open(false);
@@ -1261,7 +1223,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and a message
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// Attach some metadata to the message
 		Metadata metadata = new Metadata();
@@ -1332,7 +1294,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and a message
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// Attach some metadata to the message
 		Metadata metadata = new Metadata();
@@ -1393,8 +1355,8 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and two messages
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
-		db.addMessage(txn, message1, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
+		db.addMessage(txn, message1, DELIVERED, true, null);
 
 		// Attach some metadata to the messages
 		Metadata metadata = new Metadata();
@@ -1497,8 +1459,8 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and two messages
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
-		db.addMessage(txn, message1, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
+		db.addMessage(txn, message1, DELIVERED, true, null);
 
 		// Attach some metadata to the messages
 		Metadata metadata = new Metadata();
@@ -1574,9 +1536,9 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and some messages
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, PENDING, true, false, contactId);
-		db.addMessage(txn, message1, PENDING, true, false, contactId);
-		db.addMessage(txn, message2, INVALID, true, false, contactId);
+		db.addMessage(txn, message, PENDING, true, contactId);
+		db.addMessage(txn, message1, PENDING, true, contactId);
+		db.addMessage(txn, message2, INVALID, true, contactId);
 
 		// Add dependencies
 		db.addMessageDependency(txn, message, messageId1, PENDING);
@@ -1627,7 +1589,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		assertEquals(0, dependents.size());
 
 		// Add message 3
-		db.addMessage(txn, message3, UNKNOWN, false, false, contactId);
+		db.addMessage(txn, message3, UNKNOWN, false, contactId);
 
 		// Message 3 has message 1 as a dependent
 		dependents = db.getMessageDependents(txn, messageId3);
@@ -1639,7 +1601,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		assertEquals(0, dependents.size());
 
 		// Add message 4
-		db.addMessage(txn, message4, UNKNOWN, false, false, contactId);
+		db.addMessage(txn, message4, UNKNOWN, false, contactId);
 
 		// Message 4 has message 2 as a dependent
 		dependents = db.getMessageDependents(txn, messageId4);
@@ -1657,7 +1619,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and a message
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, PENDING, true, false, contactId);
+		db.addMessage(txn, message, PENDING, true, contactId);
 
 		// Add a second group
 		Group group1 = getGroup(clientId, 123);
@@ -1667,7 +1629,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		// Add a message to the second group
 		Message message1 = getMessage(groupId1);
 		MessageId messageId1 = message1.getId();
-		db.addMessage(txn, message1, DELIVERED, true, false, contactId);
+		db.addMessage(txn, message1, DELIVERED, true, contactId);
 
 		// Create an ID for a missing message
 		MessageId messageId2 = new MessageId(getRandomId());
@@ -1675,7 +1637,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		// Add another message to the first group
 		Message message3 = getMessage(groupId);
 		MessageId messageId3 = message3.getId();
-		db.addMessage(txn, message3, DELIVERED, true, false, contactId);
+		db.addMessage(txn, message3, DELIVERED, true, contactId);
 
 		// Add dependencies between the messages
 		db.addMessageDependency(txn, message, messageId1, PENDING);
@@ -1718,10 +1680,10 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and some messages with different states
 		db.addGroup(txn, group);
-		db.addMessage(txn, message1, UNKNOWN, true, false, contactId);
-		db.addMessage(txn, message2, INVALID, true, false, contactId);
-		db.addMessage(txn, message3, PENDING, true, false, contactId);
-		db.addMessage(txn, message4, DELIVERED, true, false, contactId);
+		db.addMessage(txn, message1, UNKNOWN, true, contactId);
+		db.addMessage(txn, message2, INVALID, true, contactId);
+		db.addMessage(txn, message3, PENDING, true, contactId);
+		db.addMessage(txn, message4, DELIVERED, true, contactId);
 
 		Collection<MessageId> result;
 
@@ -1751,10 +1713,10 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and some messages
 		db.addGroup(txn, group);
-		db.addMessage(txn, message1, DELIVERED, true, false, contactId);
-		db.addMessage(txn, message2, DELIVERED, false, false, contactId);
-		db.addMessage(txn, message3, DELIVERED, false, false, contactId);
-		db.addMessage(txn, message4, DELIVERED, true, false, contactId);
+		db.addMessage(txn, message1, DELIVERED, true, contactId);
+		db.addMessage(txn, message2, DELIVERED, false, contactId);
+		db.addMessage(txn, message3, DELIVERED, false, contactId);
+		db.addMessage(txn, message4, DELIVERED, true, contactId);
 
 		// Introduce dependencies between the messages
 		db.addMessageDependency(txn, message1, message2.getId(), DELIVERED);
@@ -1782,7 +1744,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// The message should not be sent or seen
 		MessageStatus status = db.getMessageStatus(txn, contactId, messageId);
@@ -1916,7 +1878,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// The message should be visible to the contact
 		assertTrue(db.containsVisibleMessage(txn, contactId, messageId));
@@ -1999,7 +1961,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 		// Add a group and a message
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, UNKNOWN, false, false, contactId);
+		db.addMessage(txn, message, UNKNOWN, false, contactId);
 
 		// Walk the message through the validation and delivery states
 		assertEquals(UNKNOWN, db.getMessageState(txn, messageId));
@@ -2026,7 +1988,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		assertEquals(contactId,
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
-		db.addMessage(txn, message, UNKNOWN, false, false, null);
+		db.addMessage(txn, message, UNKNOWN, false, null);
 
 		// There should be no messages to send
 		assertEquals(Long.MAX_VALUE, db.getNextSendTime(txn, contactId));
@@ -2111,7 +2073,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// Time: now
 		// Retrieve the message from the database
@@ -2156,7 +2118,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 				db.addContact(txn, author, localAuthor.getId(), null, true));
 		db.addGroup(txn, group);
 		db.addGroupVisibility(txn, contactId, groupId, true);
-		db.addMessage(txn, message, DELIVERED, true, false, null);
+		db.addMessage(txn, message, DELIVERED, true, null);
 
 		// Time: now
 		// Retrieve the message from the database
@@ -2295,58 +2257,6 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		db.close();
 	}
 
-	@Test
-	public void testTemporaryMessages() throws Exception {
-		Message message1 = getMessage(groupId);
-		MessageId messageId1 = message1.getId();
-
-		Database<Connection> db = open(false);
-		Connection txn = db.startTransaction();
-
-		// Add a group and two temporary messages
-		db.addGroup(txn, group);
-		db.addMessage(txn, message, DELIVERED, false, true, null);
-		db.addMessage(txn, message1, DELIVERED, false, true, null);
-
-		// Mark one of the messages as permanent
-		db.setMessagePermanent(txn, messageId);
-
-		// Remove all temporary messages
-		db.removeTemporaryMessages(txn);
-
-		// The permanent message should not have been removed
-		assertTrue(db.containsMessage(txn, messageId));
-
-		// The temporary message should have been removed
-		assertFalse(db.containsMessage(txn, messageId1));
-
-		db.commitTransaction(txn);
-		db.close();
-	}
-
-	@Test
-	public void testSyncVersions() throws Exception {
-		Database<Connection> db = open(false);
-		Connection txn = db.startTransaction();
-
-		// Add a contact
-		db.addIdentity(txn, identity);
-		assertEquals(contactId,
-				db.addContact(txn, author, localAuthor.getId(), null, true));
-
-		// Only sync version 0 should be supported by default
-		List<Byte> defaultSupported = singletonList((byte) 0);
-		assertEquals(defaultSupported, db.getSyncVersions(txn, contactId));
-
-		// Set the supported versions and check that they're returned
-		List<Byte> supported = asList((byte) 0, (byte) 1);
-		db.setSyncVersions(txn, contactId, supported);
-		assertEquals(supported, db.getSyncVersions(txn, contactId));
-
-		db.commitTransaction(txn);
-		db.close();
-	}
-
 	private Database<Connection> open(boolean resume) throws Exception {
 		return open(resume, new TestMessageFactory(), new SystemClock());
 	}

bramble-core/src/test/java/org/briarproject/bramble/lifecycle/LifecycleManagerImplTest.java

@@ -42,7 +42,6 @@ public class LifecycleManagerImplTest extends BrambleMockTestCase {
 			oneOf(db).open(dbKey, lifecycleManager);
 			will(returnValue(false));
 			oneOf(db).transaction(with(false), withDbRunnable(txn));
-			oneOf(db).removeTemporaryMessages(txn);
 			allowing(eventBus).broadcast(with(any(LifecycleEvent.class)));
 		}});
 

bramble-core/src/test/java/org/briarproject/bramble/plugin/PollerImplTest.java

@@ -13,8 +13,8 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
 import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
@@ -38,7 +38,7 @@ import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
 import static java.util.Collections.singletonMap;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static org.briarproject.bramble.test.ListMatcher.listOf;
+import static org.briarproject.bramble.test.CollectionMatcher.collectionOf;
 import static org.briarproject.bramble.test.PairMatcher.pairOf;
 import static org.briarproject.bramble.test.TestUtils.getContactId;
 import static org.briarproject.bramble.test.TestUtils.getTransportId;
@@ -322,7 +322,7 @@ public class PollerImplTest extends BrambleMockTestCase {
 	}
 
 	@Test
-	public void testPollsOnTransportActivated() throws Exception {
+	public void testPollsOnTransportEnabled() throws Exception {
 		DuplexPlugin plugin = context.mock(DuplexPlugin.class);
 
 		context.checking(new Expectations() {{
@@ -351,20 +351,17 @@ public class PollerImplTest extends BrambleMockTestCase {
 			oneOf(scheduler).schedule(with(any(Runnable.class)),
 					with((long) (pollingInterval * 0.5)), with(MILLISECONDS));
 			will(returnValue(future));
-			// FIXME: Revert
-			oneOf(plugin).supportsDiscovery();
-			will(returnValue(false));
 			// Get the transport properties and connected contacts
 			oneOf(transportPropertyManager).getRemoteProperties(transportId);
 			will(returnValue(singletonMap(contactId, properties)));
 			oneOf(connectionRegistry).getConnectedContacts(transportId);
 			will(returnValue(emptyList()));
 			// Poll the plugin
-			oneOf(plugin).poll(with(listOf(pairOf(
-					equal(properties), any(ConnectionHandler.class)))));
+			oneOf(plugin).poll(with(collectionOf(
+					pairOf(equal(properties), any(ConnectionHandler.class)))));
 		}});
 
-		poller.eventOccurred(new TransportActiveEvent(transportId));
+		poller.eventOccurred(new TransportEnabledEvent(transportId));
 	}
 
 	@Test
@@ -397,9 +394,6 @@ public class PollerImplTest extends BrambleMockTestCase {
 			oneOf(scheduler).schedule(with(any(Runnable.class)),
 					with((long) (pollingInterval * 0.5)), with(MILLISECONDS));
 			will(returnValue(future));
-			// FIXME: Revert
-			oneOf(plugin).supportsDiscovery();
-			will(returnValue(false));
 			// Get the transport properties and connected contacts
 			oneOf(transportPropertyManager).getRemoteProperties(transportId);
 			will(returnValue(singletonMap(contactId, properties)));
@@ -408,11 +402,11 @@ public class PollerImplTest extends BrambleMockTestCase {
 			// All contacts are connected, so don't poll the plugin
 		}});
 
-		poller.eventOccurred(new TransportActiveEvent(transportId));
+		poller.eventOccurred(new TransportEnabledEvent(transportId));
 	}
 
 	@Test
-	public void testCancelsPollingOnTransportDeactivated() {
+	public void testCancelsPollingOnTransportDisabled() {
 		Plugin plugin = context.mock(Plugin.class);
 
 		context.checking(new Expectations() {{
@@ -430,11 +424,11 @@ public class PollerImplTest extends BrambleMockTestCase {
 			oneOf(scheduler).schedule(with(any(Runnable.class)), with(0L),
 					with(MILLISECONDS));
 			will(returnValue(future));
-			// The plugin is deactivated before the task runs - cancel the task
+			// The plugin is disabled before the task runs - cancel the task
 			oneOf(future).cancel(false);
 		}});
 
-		poller.eventOccurred(new TransportActiveEvent(transportId));
-		poller.eventOccurred(new TransportInactiveEvent(transportId));
+		poller.eventOccurred(new TransportEnabledEvent(transportId));
+		poller.eventOccurred(new TransportDisabledEvent(transportId));
 	}
 }

bramble-core/src/test/java/org/briarproject/bramble/plugin/tcp/LanTcpPluginTest.java

@@ -4,15 +4,15 @@ import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
-import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
+import org.briarproject.bramble.plugin.tcp.LanTcpPlugin.LanAddressComparator;
 import org.briarproject.bramble.test.BrambleTestCase;
-import org.junit.Before;
 import org.junit.Test;
 
 import java.io.IOException;
@@ -22,6 +22,7 @@ import java.net.InetSocketAddress;
 import java.net.NetworkInterface;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.util.Comparator;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -32,90 +33,56 @@ import static java.util.concurrent.Executors.newCachedThreadPool;
 import static java.util.concurrent.TimeUnit.SECONDS;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.COMMIT_LENGTH;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_LAN;
-import static org.briarproject.bramble.api.plugin.Plugin.PREF_PLUGIN_ENABLE;
-import static org.briarproject.bramble.plugin.tcp.LanTcpPlugin.areAddressesInSameNetwork;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assume.assumeTrue;
 
 public class LanTcpPluginTest extends BrambleTestCase {
 
 	private final Backoff backoff = new TestBackoff();
 	private final ExecutorService ioExecutor = newCachedThreadPool();
 
-	private Callback callback = null;
-	private LanTcpPlugin plugin = null;
-
-	@Before
-	public void setUp() {
-		callback = new Callback();
-		plugin = new LanTcpPlugin(ioExecutor, backoff, callback, 0, 0, 1000) {
-			@Override
-			protected boolean canConnectToOwnAddress() {
-				return true;
-			}
-		};
-	}
-
 	@Test
-	public void testAreAddressesInSameNetwork() {
-		// Local and remote in 10.0.0.0/8
-		assertTrue(areAddressesInSameNetwork(makeAddress(10, 0, 0, 0),
-				makeAddress(10, 255, 255, 255), 8));
-		assertFalse(areAddressesInSameNetwork(makeAddress(10, 0, 0, 0),
-				makeAddress(10, 255, 255, 255), 9));
-
-		// Local and remote in 172.16.0.0/12
-		assertTrue(areAddressesInSameNetwork(makeAddress(172, 16, 0, 0),
-				makeAddress(172, 31, 255, 255), 12));
-		assertFalse(areAddressesInSameNetwork(makeAddress(172, 16, 0, 0),
-				makeAddress(172, 31, 255, 255), 13));
-
-		// Local and remote in 192.168.0.0/16
-		assertTrue(areAddressesInSameNetwork(makeAddress(192, 168, 0, 0),
-				makeAddress(192, 168, 255, 255), 16));
-		assertFalse(areAddressesInSameNetwork(makeAddress(192, 168, 0, 0),
-				makeAddress(192, 168, 255, 255), 17));
-
-		// Local and remote in 169.254.0.0/16
-		assertTrue(areAddressesInSameNetwork(makeAddress(169, 254, 0, 0),
-				makeAddress(169, 254, 255, 255), 16));
-		assertFalse(areAddressesInSameNetwork(makeAddress(169, 254, 0, 0),
-				makeAddress(169, 254, 255, 255), 17));
-
-		// Local in 10.0.0.0/8, remote in a different network
-		assertFalse(areAddressesInSameNetwork(makeAddress(10, 0, 0, 0),
-				makeAddress(172, 31, 255, 255), 8));
-		assertFalse(areAddressesInSameNetwork(makeAddress(10, 0, 0, 0),
-				makeAddress(192, 168, 255, 255), 8));
-		assertFalse(areAddressesInSameNetwork(makeAddress(10, 0, 0, 0),
-				makeAddress(169, 254, 255, 255), 8));
-
-		// Local in 172.16.0.0/12, remote in a different network
-		assertFalse(areAddressesInSameNetwork(makeAddress(172, 16, 0, 0),
-				makeAddress(10, 255, 255, 255), 12));
-		assertFalse(areAddressesInSameNetwork(makeAddress(172, 16, 0, 0),
-				makeAddress(192, 168, 255, 255), 12));
-		assertFalse(areAddressesInSameNetwork(makeAddress(172, 16, 0, 0),
-				makeAddress(169, 254, 255, 255), 12));
-
-		// Local in 192.168.0.0/16, remote in a different network
-		assertFalse(areAddressesInSameNetwork(makeAddress(192, 168, 0, 0),
-				makeAddress(10, 255, 255, 255), 16));
-		assertFalse(areAddressesInSameNetwork(makeAddress(192, 168, 0, 0),
-				makeAddress(172, 31, 255, 255), 16));
-		assertFalse(areAddressesInSameNetwork(makeAddress(192, 168, 0, 0),
-				makeAddress(169, 254, 255, 255), 16));
-
-		// Local in 169.254.0.0/16, remote in a different network
-		assertFalse(areAddressesInSameNetwork(makeAddress(169, 254, 0, 0),
-				makeAddress(10, 255, 255, 255), 16));
-		assertFalse(areAddressesInSameNetwork(makeAddress(169, 254, 0, 0),
-				makeAddress(172, 31, 255, 255), 16));
-		assertFalse(areAddressesInSameNetwork(makeAddress(169, 254, 0, 0),
-				makeAddress(192, 168, 255, 255), 16));
+	public void testAddressesAreOnSameLan() {
+		Callback callback = new Callback();
+		LanTcpPlugin plugin = new LanTcpPlugin(ioExecutor, backoff, callback,
+				0, 0);
+		// Local and remote in 10.0.0.0/8 should return true
+		assertTrue(plugin.addressesAreOnSameLan(makeAddress(10, 0, 0, 0),
+				makeAddress(10, 255, 255, 255)));
+		// Local and remote in 172.16.0.0/12 should return true
+		assertTrue(plugin.addressesAreOnSameLan(makeAddress(172, 16, 0, 0),
+				makeAddress(172, 31, 255, 255)));
+		// Local and remote in 192.168.0.0/16 should return true
+		assertTrue(plugin.addressesAreOnSameLan(makeAddress(192, 168, 0, 0),
+				makeAddress(192, 168, 255, 255)));
+		// Local and remote in 169.254.0.0/16 (link-local) should return true
+		assertTrue(plugin.addressesAreOnSameLan(makeAddress(169, 254, 0, 0),
+				makeAddress(169, 254, 255, 255)));
+		// Local and remote in different recognised prefixes should return false
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(10, 0, 0, 0),
+				makeAddress(172, 31, 255, 255)));
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(10, 0, 0, 0),
+				makeAddress(192, 168, 255, 255)));
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(172, 16, 0, 0),
+				makeAddress(10, 255, 255, 255)));
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(172, 16, 0, 0),
+				makeAddress(192, 168, 255, 255)));
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(192, 168, 0, 0),
+				makeAddress(10, 255, 255, 255)));
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(192, 168, 0, 0),
+				makeAddress(172, 31, 255, 255)));
+		// Remote prefix unrecognised should return false
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(10, 0, 0, 0),
+				makeAddress(1, 2, 3, 4)));
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(172, 16, 0, 0),
+				makeAddress(1, 2, 3, 4)));
+		assertFalse(plugin.addressesAreOnSameLan(makeAddress(192, 168, 0, 0),
+				makeAddress(1, 2, 3, 4)));
+		// Both prefixes unrecognised should return true (could be link-local)
+		assertTrue(plugin.addressesAreOnSameLan(makeAddress(1, 2, 3, 4),
+				makeAddress(5, 6, 7, 8)));
 	}
 
 	private byte[] makeAddress(int... parts) {
@@ -126,7 +93,13 @@ public class LanTcpPluginTest extends BrambleTestCase {
 
 	@Test
 	public void testIncomingConnection() throws Exception {
-		assumeTrue(systemHasLocalIpv4Address());
+		if (!systemHasLocalIpv4Address()) {
+			System.err.println("WARNING: Skipping test, no local IPv4 address");
+			return;
+		}
+		Callback callback = new Callback();
+		DuplexPlugin plugin = new LanTcpPlugin(ioExecutor, backoff, callback,
+				0, 0);
 		plugin.start();
 		// The plugin should have bound a socket and stored the port number
 		assertTrue(callback.propertiesLatch.await(5, SECONDS));
@@ -155,7 +128,13 @@ public class LanTcpPluginTest extends BrambleTestCase {
 
 	@Test
 	public void testOutgoingConnection() throws Exception {
-		assumeTrue(systemHasLocalIpv4Address());
+		if (!systemHasLocalIpv4Address()) {
+			System.err.println("WARNING: Skipping test, no local IPv4 address");
+			return;
+		}
+		Callback callback = new Callback();
+		DuplexPlugin plugin = new LanTcpPlugin(ioExecutor, backoff, callback,
+				0, 0);
 		plugin.start();
 		// The plugin should have bound a socket and stored the port number
 		assertTrue(callback.propertiesLatch.await(5, SECONDS));
@@ -198,7 +177,13 @@ public class LanTcpPluginTest extends BrambleTestCase {
 
 	@Test
 	public void testIncomingKeyAgreementConnection() throws Exception {
-		assumeTrue(systemHasLocalIpv4Address());
+		if (!systemHasLocalIpv4Address()) {
+			System.err.println("WARNING: Skipping test, no local IPv4 address");
+			return;
+		}
+		Callback callback = new Callback();
+		DuplexPlugin plugin = new LanTcpPlugin(ioExecutor, backoff, callback,
+				0, 0);
 		plugin.start();
 		assertTrue(callback.propertiesLatch.await(5, SECONDS));
 		KeyAgreementListener kal =
@@ -240,7 +225,13 @@ public class LanTcpPluginTest extends BrambleTestCase {
 
 	@Test
 	public void testOutgoingKeyAgreementConnection() throws Exception {
-		assumeTrue(systemHasLocalIpv4Address());
+		if (!systemHasLocalIpv4Address()) {
+			System.err.println("WARNING: Skipping test, no local IPv4 address");
+			return;
+		}
+		Callback callback = new Callback();
+		DuplexPlugin plugin = new LanTcpPlugin(ioExecutor, backoff, callback,
+				0, 0);
 		plugin.start();
 		// The plugin should have bound a socket and stored the port number
 		assertTrue(callback.propertiesLatch.await(5, SECONDS));
@@ -285,12 +276,62 @@ public class LanTcpPluginTest extends BrambleTestCase {
 		plugin.stop();
 	}
 
+	@Test
+	public void testComparatorPrefersNonZeroPorts() {
+		Comparator<InetSocketAddress> comparator = new LanAddressComparator();
+		InetSocketAddress nonZero = new InetSocketAddress("1.2.3.4", 1234);
+		InetSocketAddress zero = new InetSocketAddress("1.2.3.4", 0);
+
+		assertEquals(0, comparator.compare(nonZero, nonZero));
+		assertTrue(comparator.compare(nonZero, zero) < 0);
+
+		assertTrue(comparator.compare(zero, nonZero) > 0);
+		assertEquals(0, comparator.compare(zero, zero));
+	}
+
+	@Test
+	public void testComparatorPrefersLongerPrefixes() {
+		Comparator<InetSocketAddress> comparator = new LanAddressComparator();
+		InetSocketAddress prefix192 = new InetSocketAddress("192.168.0.1", 0);
+		InetSocketAddress prefix172 = new InetSocketAddress("172.16.0.1", 0);
+		InetSocketAddress prefix10 = new InetSocketAddress("10.0.0.1", 0);
+
+		assertEquals(0, comparator.compare(prefix192, prefix192));
+		assertTrue(comparator.compare(prefix192, prefix172) < 0);
+		assertTrue(comparator.compare(prefix192, prefix10) < 0);
+
+		assertTrue(comparator.compare(prefix172, prefix192) > 0);
+		assertEquals(0, comparator.compare(prefix172, prefix172));
+		assertTrue(comparator.compare(prefix172, prefix10) < 0);
+
+		assertTrue(comparator.compare(prefix10, prefix192) > 0);
+		assertTrue(comparator.compare(prefix10, prefix172) > 0);
+		assertEquals(0, comparator.compare(prefix10, prefix10));
+	}
+
+	@Test
+	public void testComparatorPrefersSiteLocalToLinkLocal() {
+		Comparator<InetSocketAddress> comparator = new LanAddressComparator();
+		InetSocketAddress prefix192 = new InetSocketAddress("192.168.0.1", 0);
+		InetSocketAddress prefix172 = new InetSocketAddress("172.16.0.1", 0);
+		InetSocketAddress prefix10 = new InetSocketAddress("10.0.0.1", 0);
+		InetSocketAddress linkLocal = new InetSocketAddress("169.254.0.1", 0);
+
+		assertTrue(comparator.compare(prefix192, linkLocal) < 0);
+		assertTrue(comparator.compare(prefix172, linkLocal) < 0);
+		assertTrue(comparator.compare(prefix10, linkLocal) < 0);
+
+		assertTrue(comparator.compare(linkLocal, prefix192) > 0);
+		assertTrue(comparator.compare(linkLocal, prefix172) > 0);
+		assertTrue(comparator.compare(linkLocal, prefix10) > 0);
+		assertEquals(0, comparator.compare(linkLocal, linkLocal));
+	}
+
 	private boolean systemHasLocalIpv4Address() throws Exception {
 		for (NetworkInterface i : list(getNetworkInterfaces())) {
 			for (InetAddress a : list(i.getInetAddresses())) {
-				if (a instanceof Inet4Address) {
+				if (a instanceof Inet4Address)
 					return a.isLinkLocalAddress() || a.isSiteLocalAddress();
-				}
 			}
 		}
 		return false;
@@ -299,20 +340,13 @@ public class LanTcpPluginTest extends BrambleTestCase {
 	@NotNullByDefault
 	private static class Callback implements PluginCallback {
 
-		// Properties will be stored twice: the preferred port at startup,
-		// and the IP:port when the server socket is bound
-		private final CountDownLatch propertiesLatch = new CountDownLatch(2);
+		private final CountDownLatch propertiesLatch = new CountDownLatch(1);
 		private final CountDownLatch connectionsLatch = new CountDownLatch(1);
 		private final TransportProperties local = new TransportProperties();
-		private final Settings settings = new Settings();
-
-		private Callback() {
-			settings.putBoolean(PREF_PLUGIN_ENABLE, true);
-		}
 
 		@Override
 		public Settings getSettings() {
-			return settings;
+			return new Settings();
 		}
 
 		@Override
@@ -331,7 +365,11 @@ public class LanTcpPluginTest extends BrambleTestCase {
 		}
 
 		@Override
-		public void pluginStateChanged(State newState) {
+		public void transportEnabled() {
+		}
+
+		@Override
+		public void transportDisabled() {
 		}
 
 		@Override

bramble-core/src/test/java/org/briarproject/bramble/properties/TransportPropertyManagerImplTest.java

@@ -637,8 +637,7 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 			will(returnValue(timestamp));
 			oneOf(clientHelper).createMessage(g, timestamp, body);
 			will(returnValue(message));
-			oneOf(clientHelper).addLocalMessage(txn, message, meta, shared,
-					false);
+			oneOf(clientHelper).addLocalMessage(txn, message, meta, shared);
 		}});
 	}
 }

bramble-core/src/test/java/org/briarproject/bramble/rendezvous/RendezvousPollerImplTest.java

@@ -17,8 +17,8 @@ import org.briarproject.bramble.api.plugin.ConnectionManager;
 import org.briarproject.bramble.api.plugin.PluginManager;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.rendezvous.KeyMaterialSource;
 import org.briarproject.bramble.api.rendezvous.RendezvousEndpoint;
@@ -45,11 +45,10 @@ import static java.util.Collections.singletonList;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.briarproject.bramble.api.contact.PendingContactState.ADDING_CONTACT;
 import static org.briarproject.bramble.api.contact.PendingContactState.FAILED;
-import static org.briarproject.bramble.api.contact.PendingContactState.OFFLINE;
 import static org.briarproject.bramble.api.contact.PendingContactState.WAITING_FOR_CONNECTION;
 import static org.briarproject.bramble.rendezvous.RendezvousConstants.POLLING_INTERVAL_MS;
 import static org.briarproject.bramble.rendezvous.RendezvousConstants.RENDEZVOUS_TIMEOUT_MS;
-import static org.briarproject.bramble.test.ListMatcher.listOf;
+import static org.briarproject.bramble.test.CollectionMatcher.collectionOf;
 import static org.briarproject.bramble.test.PairMatcher.pairOf;
 import static org.briarproject.bramble.test.TestUtils.getAgreementPrivateKey;
 import static org.briarproject.bramble.test.TestUtils.getAgreementPublicKey;
@@ -121,7 +120,7 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 			will(returnValue(beforeExpiry));
 			oneOf(eventBus).broadcast(with(new PredicateMatcher<>(
 					PendingContactStateChangedEvent.class, e ->
-					e.getPendingContactState() == OFFLINE)));
+					e.getPendingContactState() == WAITING_FOR_CONNECTION)));
 			// Capture the poll task
 			oneOf(scheduler).scheduleAtFixedRate(with(any(Runnable.class)),
 					with(POLLING_INTERVAL_MS), with(POLLING_INTERVAL_MS),
@@ -178,14 +177,14 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 		rendezvousPoller.startService();
 		context.assertIsSatisfied();
 
-		// Activate the transport - no endpoints should be created yet
+		// Enable the transport - no endpoints should be created yet
 		expectGetPlugin();
 
-		rendezvousPoller.eventOccurred(new TransportActiveEvent(transportId));
+		rendezvousPoller.eventOccurred(new TransportEnabledEvent(transportId));
 		context.assertIsSatisfied();
 
 		// Add the pending contact - endpoint should be created and polled
-		expectAddPendingContact(beforeExpiry, WAITING_FOR_CONNECTION);
+		expectAddUnexpiredPendingContact(beforeExpiry);
 		expectDeriveRendezvousKey();
 		expectCreateEndpoint();
 
@@ -196,7 +195,7 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(beforeExpiry));
 			oneOf(eventBus).broadcast(with(any(RendezvousPollEvent.class)));
-			oneOf(plugin).poll(with(listOf(pairOf(
+			oneOf(plugin).poll(with(collectionOf(pairOf(
 					equal(transportProperties),
 					any(ConnectionHandler.class)))));
 		}});
@@ -206,14 +205,16 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 		context.assertIsSatisfied();
 
 		// Remove the pending contact - endpoint should be closed
-		expectCloseEndpoint();
+		context.checking(new Expectations() {{
+			oneOf(rendezvousEndpoint).close();
+		}});
 
 		rendezvousPoller.eventOccurred(
 				new PendingContactRemovedEvent(pendingContact.getId()));
 		context.assertIsSatisfied();
 
-		// Deactivate the transport - endpoint is already closed
-		rendezvousPoller.eventOccurred(new TransportInactiveEvent(transportId));
+		// Disable the transport - endpoint is already closed
+		rendezvousPoller.eventOccurred(new TransportDisabledEvent(transportId));
 	}
 
 	@Test
@@ -230,14 +231,14 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 		rendezvousPoller.startService();
 		context.assertIsSatisfied();
 
-		// Activate the transport - no endpoints should be created yet
+		// Enable the transport - no endpoints should be created yet
 		expectGetPlugin();
 
-		rendezvousPoller.eventOccurred(new TransportActiveEvent(transportId));
+		rendezvousPoller.eventOccurred(new TransportEnabledEvent(transportId));
 		context.assertIsSatisfied();
 
 		// Add the pending contact - endpoint should be created and polled
-		expectAddPendingContact(beforeExpiry, WAITING_FOR_CONNECTION);
+		expectAddUnexpiredPendingContact(beforeExpiry);
 		expectDeriveRendezvousKey();
 		expectCreateEndpoint();
 
@@ -248,7 +249,7 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(beforeExpiry));
 			oneOf(eventBus).broadcast(with(any(RendezvousPollEvent.class)));
-			oneOf(plugin).poll(with(listOf(pairOf(
+			oneOf(plugin).poll(with(collectionOf(pairOf(
 					equal(transportProperties),
 					any(ConnectionHandler.class)))));
 		}});
@@ -259,7 +260,10 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 
 		// Run the poll task - pending contact expires, endpoint is closed
 		expectPendingContactExpires(afterExpiry);
-		expectCloseEndpoint();
+
+		context.checking(new Expectations() {{
+			oneOf(rendezvousEndpoint).close();
+		}});
 
 		capturePollTask.get().run();
 		context.assertIsSatisfied();
@@ -269,12 +273,12 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 				new PendingContactRemovedEvent(pendingContact.getId()));
 		context.assertIsSatisfied();
 
-		// Deactivate the transport - endpoint is already closed
-		rendezvousPoller.eventOccurred(new TransportInactiveEvent(transportId));
+		// Disable the transport - endpoint is already closed
+		rendezvousPoller.eventOccurred(new TransportDisabledEvent(transportId));
 	}
 
 	@Test
-	public void testCreatesAndClosesEndpointsWhenTransportIsActivatedAndDeactivated()
+	public void testCreatesAndClosesEndpointsWhenTransportIsEnabledAndDisabled()
 			throws Exception {
 		long beforeExpiry = pendingContact.getTimestamp();
 
@@ -285,26 +289,26 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 		context.assertIsSatisfied();
 
 		// Add the pending contact - no endpoints should be created yet
-		expectAddPendingContact(beforeExpiry, OFFLINE);
+		expectAddUnexpiredPendingContact(beforeExpiry);
 		expectDeriveRendezvousKey();
 
 		rendezvousPoller.eventOccurred(
 				new PendingContactAddedEvent(pendingContact));
 		context.assertIsSatisfied();
 
-		// Activate the transport - endpoint should be created
+		// Enable the transport - endpoint should be created
 		expectGetPlugin();
 		expectCreateEndpoint();
-		expectStateChangedEvent(WAITING_FOR_CONNECTION);
 
-		rendezvousPoller.eventOccurred(new TransportActiveEvent(transportId));
+		rendezvousPoller.eventOccurred(new TransportEnabledEvent(transportId));
 		context.assertIsSatisfied();
 
-		// Deactivate the transport - endpoint should be closed
-		expectCloseEndpoint();
-		expectStateChangedEvent(OFFLINE);
+		// Disable the transport - endpoint should be closed
+		context.checking(new Expectations() {{
+			oneOf(rendezvousEndpoint).close();
+		}});
 
-		rendezvousPoller.eventOccurred(new TransportInactiveEvent(transportId));
+		rendezvousPoller.eventOccurred(new TransportDisabledEvent(transportId));
 		context.assertIsSatisfied();
 
 		// Remove the pending contact - endpoint is already closed
@@ -478,14 +482,13 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 		return capturePollTask;
 	}
 
-	private void expectAddPendingContact(long now,
-			PendingContactState initialState) {
+	private void expectAddUnexpiredPendingContact(long now) {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(now));
 			oneOf(eventBus).broadcast(with(new PredicateMatcher<>(
 					PendingContactStateChangedEvent.class, e ->
-					e.getPendingContactState() == initialState)));
+					e.getPendingContactState() == WAITING_FOR_CONNECTION)));
 		}});
 	}
 
@@ -543,7 +546,7 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 			will(returnValue(now));
 			oneOf(eventBus).broadcast(with(new PredicateMatcher<>(
 					PendingContactStateChangedEvent.class, e ->
-					e.getPendingContactState() == OFFLINE)));
+					e.getPendingContactState() == WAITING_FOR_CONNECTION)));
 			// Capture the poll task
 			oneOf(scheduler).scheduleAtFixedRate(with(any(Runnable.class)),
 					with(POLLING_INTERVAL_MS), with(POLLING_INTERVAL_MS),
@@ -573,10 +576,4 @@ public class RendezvousPollerImplTest extends BrambleMockTestCase {
 					e.getPendingContactState() == state)));
 		}});
 	}
-
-	private void expectCloseEndpoint() throws Exception {
-		context.checking(new Expectations() {{
-			oneOf(rendezvousEndpoint).close();
-		}});
-	}
 }

bramble-core/src/test/java/org/briarproject/bramble/sync/SimplexOutgoingSessionTest.java

@@ -9,7 +9,6 @@ import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
-import org.briarproject.bramble.api.sync.Versions;
 import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.briarproject.bramble.test.DbExpectations;
@@ -50,8 +49,6 @@ public class SimplexOutgoingSessionTest extends BrambleMockTestCase {
 		context.checking(new DbExpectations() {{
 			// Add listener
 			oneOf(eventBus).addListener(session);
-			// Send the protocol versions
-			oneOf(recordWriter).writeVersions(with(any(Versions.class)));
 			// No acks to send
 			oneOf(db).transactionWithNullableResult(with(false),
 					withNullableDbCallable(noAckTxn));
@@ -86,8 +83,6 @@ public class SimplexOutgoingSessionTest extends BrambleMockTestCase {
 		context.checking(new DbExpectations() {{
 			// Add listener
 			oneOf(eventBus).addListener(session);
-			// Send the protocol versions
-			oneOf(recordWriter).writeVersions(with(any(Versions.class)));
 			// One ack to send
 			oneOf(db).transactionWithNullableResult(with(false),
 					withNullableDbCallable(ackTxn));