@GuardedBy annotations.

bramble-android/build.gradle

@@ -11,8 +11,8 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 26
-		versionCode 10106
+		versionCode 10105
-		versionName "1.1.6"
+		versionName "1.1.5"
 		consumerProguardFiles 'proguard-rules.txt'
 
 		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -30,8 +30,8 @@ configurations {
 
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	tor 'org.briarproject:tor-android:0.3.5.8@zip'
+	tor 'org.briarproject:tor-android:0.3.4.8@zip'
-	tor 'org.briarproject:obfs4proxy-android:0.0.9@zip'
+	tor 'org.briarproject:obfs4proxy-android:0.0.7@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.19'
 

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

@@ -9,23 +9,22 @@ import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.identity.IdentityManager;
-import org.briarproject.bramble.util.IoUtils;
 
 import java.io.File;
-import java.util.HashSet;
-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.logging.Logger.getLogger;
+import static org.briarproject.bramble.util.IoUtils.deleteFileOrDir;
 
 class AndroidAccountManager extends AccountManagerImpl
 		implements AccountManager {
 
 	private static final Logger LOG =
-			Logger.getLogger(AndroidAccountManager.class.getName());
+			getLogger(AndroidAccountManager.class.getName());
 
 	private static final String PREF_DB_KEY = "key";
 
@@ -41,7 +40,7 @@ class AndroidAccountManager extends AccountManagerImpl
 		appContext = app.getApplicationContext();
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	@Override
 	@Nullable
 	protected String loadEncryptedDatabaseKey() {
@@ -51,7 +50,7 @@ class AndroidAccountManager extends AccountManagerImpl
 		return key;
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	@Nullable
 	private String getDatabaseKeyFromPreferences() {
 		String key = prefs.getString(PREF_DB_KEY, null);
@@ -60,7 +59,7 @@ class AndroidAccountManager extends AccountManagerImpl
 		return key;
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	private void migrateDatabaseKeyToFile(String key) {
 		if (storeEncryptedDatabaseKey(key)) {
 			if (prefs.edit().remove(PREF_DB_KEY).commit())
@@ -85,7 +84,7 @@ class AndroidAccountManager extends AccountManagerImpl
 		return PreferenceManager.getDefaultSharedPreferences(appContext);
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	private void deleteAppData(SharedPreferences... clear) {
 		// Clear and commit shared preferences
 		for (SharedPreferences prefs : clear) {
@@ -93,42 +92,20 @@ class AndroidAccountManager extends AccountManagerImpl
 				LOG.warning("Could not clear shared preferences");
 		}
 		// Delete files, except lib and shared_prefs directories
-		Set<File> files = new HashSet<>();
 		File dataDir = new File(appContext.getApplicationInfo().dataDir);
-		@Nullable
+		File[] children = dataDir.listFiles();
-		File[] fileArray = dataDir.listFiles();
+		if (children == null) {
-		if (fileArray == null) {
 			LOG.warning("Could not list files in app data dir");
 		} else {
-			for (File file : fileArray) {
+			for (File child : children) {
-				String name = file.getName();
+				String name = child.getName();
 				if (!name.equals("lib") && !name.equals("shared_prefs")) {
-					files.add(file);
+					deleteFileOrDir(child);
 				}
 			}
 		}
-		files.add(appContext.getFilesDir());
-		files.add(appContext.getCacheDir());
-		addIfNotNull(files, appContext.getExternalCacheDir());
-		if (SDK_INT >= 19) {
-			for (File file : appContext.getExternalCacheDirs()) {
-				addIfNotNull(files, file);
-			}
-		}
-		if (SDK_INT >= 21) {
-			for (File file : appContext.getExternalMediaDirs()) {
-				addIfNotNull(files, file);
-			}
-		}
-		for (File file : files) {
-			IoUtils.deleteFileOrDir(file);
-		}
 		// Recreate the cache dir as some OpenGL drivers expect it to exist
-		if (!new File(dataDir, "cache").mkdirs())
+		if (!new File(dataDir, "cache").mkdir())
 			LOG.warning("Could not recreate cache dir");
 	}
-
-	private void addIfNotNull(Set<File> files, @Nullable File file) {
-		if (file != null) files.add(file);
-	}
 }

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

@@ -13,8 +13,7 @@ import org.briarproject.bramble.api.lifecycle.Service;
 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.system.Scheduler;
 
 import java.util.concurrent.Future;
@@ -34,16 +33,17 @@ import static android.net.ConnectivityManager.CONNECTIVITY_ACTION;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
+import static java.util.Objects.requireNonNull;
 import static java.util.concurrent.TimeUnit.MINUTES;
 import static java.util.concurrent.TimeUnit.SECONDS;
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
 
-@MethodsNotNullByDefault
+@NotNullByDefault
-@ParametersNotNullByDefault
 class AndroidNetworkManager implements NetworkManager, Service {
 
 	private static final Logger LOG =
-			Logger.getLogger(AndroidNetworkManager.class.getName());
+			getLogger(AndroidNetworkManager.class.getName());
 
 	// See android.net.wifi.WifiManager
 	private static final String WIFI_AP_STATE_CHANGED_ACTION =
@@ -56,6 +56,7 @@ class AndroidNetworkManager implements NetworkManager, Service {
 			new AtomicReference<>();
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
+	@Nullable
 	private volatile BroadcastReceiver networkStateReceiver = null;
 
 	@Inject
@@ -89,9 +90,8 @@ class AndroidNetworkManager implements NetworkManager, Service {
 
 	@Override
 	public NetworkStatus getNetworkStatus() {
-		ConnectivityManager cm = (ConnectivityManager)
+		ConnectivityManager cm = (ConnectivityManager) requireNonNull(
-				appContext.getSystemService(CONNECTIVITY_SERVICE);
+				appContext.getSystemService(CONNECTIVITY_SERVICE));
-		if (cm == null) throw new AssertionError();
 		NetworkInfo net = cm.getActiveNetworkInfo();
 		boolean connected = net != null && net.isConnected();
 		boolean wifi = connected && net.getType() == TYPE_WIFI;

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

@@ -24,7 +24,6 @@ import java.io.IOException;
 import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 import java.util.UUID;
 import java.util.concurrent.BlockingQueue;
@@ -48,9 +47,11 @@ 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.EXTRA_DEVICE;
+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.util.PrivacyUtils.scrubMacAddress;
 
 @MethodsNotNullByDefault
@@ -58,7 +59,7 @@ import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 
 	private static final Logger LOG =
-			Logger.getLogger(AndroidBluetoothPlugin.class.getName());
+			getLogger(AndroidBluetoothPlugin.class.getName());
 
 	private static final int MAX_DISCOVERY_MS = 10_000;
 
@@ -259,7 +260,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 			appContext.unregisterReceiver(receiver);
 		}
 		// Shuffle the addresses so we don't always try the same one first
-		Collections.shuffle(addresses);
+		shuffle(addresses);
 		return addresses;
 	}
 

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

@@ -32,17 +32,19 @@ 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.Objects.requireNonNull;
+import static java.util.logging.Logger.getLogger;
 
 @NotNullByDefault
 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;
 
-	private static final Logger LOG =
-			Logger.getLogger(AndroidLanTcpPlugin.class.getName());
-
 	static {
 		try {
 			WIFI_AP_ADDRESS = InetAddress.getByAddress(WIFI_AP_ADDRESS_BYTES);
@@ -66,10 +68,8 @@ class AndroidLanTcpPlugin extends LanTcpPlugin implements EventListener {
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor =
 				new PoliteExecutor("AndroidLanTcpPlugin", ioExecutor, 1);
-		ConnectivityManager connectivityManager = (ConnectivityManager)
+		connectivityManager = (ConnectivityManager) requireNonNull(
-				appContext.getSystemService(CONNECTIVITY_SERVICE);
+				appContext.getSystemService(CONNECTIVITY_SERVICE));
-		if (connectivityManager == null) throw new AssertionError();
-		this.connectivityManager = connectivityManager;
 		wifiManager = (WifiManager) appContext.getApplicationContext()
 				.getSystemService(WIFI_SERVICE);
 		socketFactory = SocketFactory.getDefault();

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

@@ -8,8 +8,7 @@ import android.os.PowerManager;
 
 import org.briarproject.bramble.api.battery.BatteryManager;
 import org.briarproject.bramble.api.network.NetworkManager;
-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.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.system.Clock;
@@ -26,10 +25,10 @@ import javax.net.SocketFactory;
 import static android.content.Context.MODE_PRIVATE;
 import static android.content.Context.POWER_SERVICE;
 import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
+import static java.util.Objects.requireNonNull;
 import static java.util.concurrent.TimeUnit.MINUTES;
 
-@MethodsNotNullByDefault
+@NotNullByDefault
-@ParametersNotNullByDefault
 class AndroidTorPlugin extends TorPlugin {
 
 	// This tag may prevent Huawei's power manager from killing us
@@ -52,8 +51,7 @@ class AndroidTorPlugin extends TorPlugin {
 				appContext.getDir("tor", MODE_PRIVATE));
 		this.appContext = appContext;
 		PowerManager pm = (PowerManager)
-				appContext.getSystemService(POWER_SERVICE);
+				requireNonNull(appContext.getSystemService(POWER_SERVICE));
-		if (pm == null) throw new AssertionError();
 		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
 				WAKE_LOCK_TAG, 1, MINUTES);
 	}

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

@@ -1,7 +1,6 @@
 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;
@@ -26,12 +25,15 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.Immutable;
 import javax.net.SocketFactory;
 
+import static android.os.Build.VERSION.SDK_INT;
+import static java.util.logging.Logger.getLogger;
+
 @Immutable
 @NotNullByDefault
 public class AndroidTorPluginFactory implements DuplexPluginFactory {
 
 	private static final Logger LOG =
-			Logger.getLogger(AndroidTorPluginFactory.class.getName());
+			getLogger(AndroidTorPluginFactory.class.getName());
 
 	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
 	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
@@ -102,7 +104,7 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 			return null;
 		}
 		// Use position-independent executable for SDK >= 16
-		if (Build.VERSION.SDK_INT >= 16) architecture += "_pie";
+		if (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

@@ -15,12 +15,13 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static android.content.Context.TELEPHONY_SERVICE;
+import static java.util.logging.Logger.getLogger;
 
 @NotNullByDefault
 class AndroidLocationUtils implements LocationUtils {
 
 	private static final Logger LOG =
-			Logger.getLogger(AndroidLocationUtils.class.getName());
+			getLogger(AndroidLocationUtils.class.getName());
 
 	private final Context appContext;
 
@@ -59,14 +60,14 @@ class AndroidLocationUtils implements LocationUtils {
 	}
 
 	private String getCountryFromPhoneNetwork() {
-		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
+		TelephonyManager tm = (TelephonyManager)
-		TelephonyManager tm = (TelephonyManager) o;
+				appContext.getSystemService(TELEPHONY_SERVICE);
-		return tm.getNetworkCountryIso();
+		return tm == null ? "" : tm.getNetworkCountryIso();
 	}
 
 	private String getCountryFromSimCard() {
-		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
+		TelephonyManager tm = (TelephonyManager)
-		TelephonyManager tm = (TelephonyManager) o;
+				appContext.getSystemService(TELEPHONY_SERVICE);
-		return tm.getSimCountryIso();
+		return tm == null ? "" : tm.getSimCountryIso();
 	}
 }

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

@@ -8,7 +8,6 @@ import android.content.ContentResolver;
 import android.content.Context;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiManager;
-import android.os.Build;
 import android.os.Parcel;
 import android.os.StrictMode;
 import android.provider.Settings;
@@ -23,6 +22,9 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static android.content.Context.WIFI_SERVICE;
+import static android.os.Build.FINGERPRINT;
+import static android.os.Build.SERIAL;
+import static android.os.Build.VERSION.SDK_INT;
 import static android.provider.Settings.Secure.ANDROID_ID;
 
 @Immutable
@@ -45,8 +47,8 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		out.writeInt(android.os.Process.myPid());
 		out.writeInt(android.os.Process.myTid());
 		out.writeInt(android.os.Process.myUid());
-		if (Build.FINGERPRINT != null) out.writeUTF(Build.FINGERPRINT);
+		if (FINGERPRINT != null) out.writeUTF(FINGERPRINT);
-		if (Build.SERIAL != null) out.writeUTF(Build.SERIAL);
+		if (SERIAL != null) out.writeUTF(SERIAL);
 		ContentResolver contentResolver = appContext.getContentResolver();
 		String id = Settings.Secure.getString(contentResolver, ANDROID_ID);
 		if (id != null) out.writeUTF(id);
@@ -74,15 +76,13 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		// Silence strict mode
 		StrictMode.ThreadPolicy tp = StrictMode.allowThreadDiskWrites();
 		super.writeSeed();
-		if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT <= 18)
+		if (SDK_INT >= 16 && SDK_INT <= 18) applyOpenSslFix();
-			applyOpenSslFix();
 		StrictMode.setThreadPolicy(tp);
 	}
 
 	// Based on https://android-developers.googleblog.com/2013/08/some-securerandom-thoughts.html
 	private void applyOpenSslFix() {
-		byte[] seed = new UnixSecureRandomSpi().engineGenerateSeed(
+		byte[] seed = new UnixSecureRandomSpi().engineGenerateSeed(SEED_LENGTH);
-				SEED_LENGTH);
 		try {
 			// Seed the OpenSSL PRNG
 			Class.forName("org.apache.harmony.xnet.provider.jsse.NativeCrypto")

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

@@ -3,17 +3,20 @@ package org.briarproject.bramble.util;
 import android.annotation.SuppressLint;
 import android.bluetooth.BluetoothAdapter;
 import android.content.Context;
-import android.os.Build;
 import android.provider.Settings;
 
 import java.io.File;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 
 import static android.content.Context.MODE_PRIVATE;
+import static android.os.Build.CPU_ABI;
+import static android.os.Build.CPU_ABI2;
+import static android.os.Build.SUPPORTED_ABIS;
 import static android.os.Build.VERSION.SDK_INT;
+import static java.util.Arrays.asList;
+import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
 public class AndroidUtils {
 
@@ -22,14 +25,13 @@ 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(Arrays.asList(Build.SUPPORTED_ABIS));
+			abis.addAll(asList(SUPPORTED_ABIS));
 		} else {
-			abis.add(Build.CPU_ABI);
+			abis.add(CPU_ABI);
-			if (Build.CPU_ABI2 != null) abis.add(Build.CPU_ABI2);
+			if (CPU_ABI2 != null) abis.add(CPU_ABI2);
 		}
 		return abis;
 	}
@@ -49,7 +51,7 @@ public class AndroidUtils {
 	}
 
 	private static boolean isValidBluetoothAddress(String address) {
-		return !StringUtils.isNullOrEmpty(address)
+		return !isNullOrEmpty(address)
 				&& BluetoothAdapter.checkBluetoothAddress(address)
 				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
 	}

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

@@ -10,17 +10,19 @@ import java.util.concurrent.TimeUnit;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
+import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
 
 @ThreadSafe
 @NotNullByDefault
 public class RenewableWakeLock {
 
 	private static final Logger LOG =
-			Logger.getLogger(RenewableWakeLock.class.getName());
+			getLogger(RenewableWakeLock.class.getName());
 
 	/**
 	 * Automatically release the lock this many milliseconds after it's due
@@ -36,10 +38,12 @@ public class RenewableWakeLock {
 	private final Runnable renewTask;
 
 	private final Object lock = new Object();
+	@GuardedBy("lock")
 	@Nullable
-	private PowerManager.WakeLock wakeLock; // Locking: lock
+	private PowerManager.WakeLock wakeLock;
+	@GuardedBy("lock")
 	@Nullable
-	private ScheduledFuture future; // Locking: lock
+	private ScheduledFuture future;
 
 	public RenewableWakeLock(PowerManager powerManager,
 			ScheduledExecutorService scheduler, int levelAndFlags, String tag,

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

@@ -112,8 +112,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		// Other directories should be deleted
 		File potatoDir = new File(testDir, ".potato");
 		File potatoFile = new File(potatoDir, "file");
-		File filesDir = new File(testDir, "filesDir");
-		File externalCacheDir = new File(testDir, "externalCacheDir");
 
 		context.checking(new Expectations() {{
 			oneOf(prefs).edit();
@@ -130,12 +128,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 			will(returnValue(true));
 			oneOf(app).getApplicationInfo();
 			will(returnValue(applicationInfo));
-			oneOf(app).getFilesDir();
-			will(returnValue(filesDir));
-			oneOf(app).getCacheDir();
-			will(returnValue(cacheDir));
-			oneOf(app).getExternalCacheDir();
-			will(returnValue(externalCacheDir));
 		}});
 
 		assertTrue(dbDir.mkdirs());
@@ -148,8 +140,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		assertTrue(cacheFile.createNewFile());
 		assertTrue(potatoDir.mkdirs());
 		assertTrue(potatoFile.createNewFile());
-		assertTrue(filesDir.mkdirs());
-		assertTrue(externalCacheDir.mkdirs());
 
 		accountManager.deleteAccount();
 
@@ -163,8 +153,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		assertFalse(cacheFile.exists());
 		assertFalse(potatoDir.exists());
 		assertFalse(potatoFile.exists());
-		assertFalse(filesDir.exists());
-		assertFalse(externalCacheDir.exists());
 	}
 
 	@After

bramble-android/witness.gradle

@@ -1,44 +1,46 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.android.tools.analytics-library:protos:26.3.2:protos-26.3.2.jar:50238fb4298b297217b184b9cd93c14f83536fcee829eb0ca850bdb5b53251f0',
+        'com.android.tools.analytics-library:protos:26.2.1:protos-26.2.1.jar:2f371f5b1f551e85ab08be4d6a2873471b3d44afd1ebf6aa3298f3b796bf691f',
-        'com.android.tools.analytics-library:shared:26.3.2:shared-26.3.2.jar:ddd80dcf21905018b7c0583ba72b7282f446084d4952422609a09fbf8237ef71',
+        'com.android.tools.analytics-library:shared:26.2.1:shared-26.2.1.jar:4c1e4e705fa4d45f23aaea230557f6508155012d9c296337787c1d7b26a97f5a',
-        'com.android.tools.analytics-library:tracker:26.3.2:tracker-26.3.2.jar:28c575d2d1af003e96d7b375a668ee10b2673a2dd0f6438750aa8c3b42e7d0ad',
+        'com.android.tools.analytics-library:tracker:26.2.1:tracker-26.2.1.jar:4a624ecc976539f755ddb0bb8dfc2dd3d08326cfec59a098dbd70f701ca7fb75',
-        'com.android.tools.build:apksig:3.3.2:apksig-3.3.2.jar:84c4aaa20127c6c1fe6bdd334b3f5df71f54ad080be9029c8a10f43b6a908acd',
+        'com.android.tools.build:aapt2:3.2.1-4818971:aapt2-3.2.1-4818971-linux.jar:f431b6f96c91a2c155144b091a9c97d9805c589fe8efc9c930b6cd346cb60a1e',
-        'com.android.tools.build:apkzlib:3.3.2:apkzlib-3.3.2.jar:d34e523278e5dff565eba3ef3c089d515b2b5cc7b47dc77e2f3465e5e47176ac',
+        'com.android.tools.build:apksig:3.2.1:apksig-3.2.1.jar:2b46f2feffea66037aab29e4261b2433c190194a6ef97b958511eb157f2ccba5',
-        'com.android.tools.build:builder-model:3.3.2:builder-model-3.3.2.jar:055e3db0ecee9e06b9f024034999a29cd92cb1885207b37542126bd8bcc57f46',
+        'com.android.tools.build:apkzlib:3.2.1:apkzlib-3.2.1.jar:c39ad0313905932431fe81c8899c2cf39a4d92ad6c4edcaa4b25432f461452aa',
-        'com.android.tools.build:builder-test-api:3.3.2:builder-test-api-3.3.2.jar:0b2e4cd7615bbcad14a3c91fe45ae26693508d06e40ba06c5968b8bc24416618',
+        'com.android.tools.build:builder-model:3.2.1:builder-model-3.2.1.jar:a9f68e6abcec122f9cb5ad352d3f05a3eb03acbcdca95e4d25c16310c2c965ff',
-        'com.android.tools.build:builder:3.3.2:builder-3.3.2.jar:65649704da7aef0487235fd326f0f2e99ed5cf958e80f204496e6e08a42bd9f5',
+        'com.android.tools.build:builder-test-api:3.2.1:builder-test-api-3.2.1.jar:533ac6c2b5884bb54967a33791f2628dfdfac7981af39417a333b43d4379b6be',
-        'com.android.tools.build:gradle-api:3.3.2:gradle-api-3.3.2.jar:3cbd47e41bb70330dd72ec2c9fe51e6173554b484a03829b5a2de9e00841e040',
+        'com.android.tools.build:builder:3.2.1:builder-3.2.1.jar:aedcbfd115dbe91d09b4113e66ef50589b558d0aa3b2f133b1d867c9b87fae83',
-        'com.android.tools.build:manifest-merger:26.3.2:manifest-merger-26.3.2.jar:05c4a6d8b02fb9f08744876477d0a68547c03a8a9069b1f086684fa04af97c33',
+        'com.android.tools.build:gradle-api:3.2.1:gradle-api-3.2.1.jar:57cf0ac5ac1dca8afdb3f62b94265e776e7dcfa641cc3844fb53a05193de208d',
-        'com.android.tools.ddms:ddmlib:26.3.2:ddmlib-26.3.2.jar:d248da8a563d6e46d2c7ebbf371a4877e00510f4ca763c0bb272d5a281bf8b85',
+        'com.android.tools.build:manifest-merger:26.2.1:manifest-merger-26.2.1.jar:8830573263361035d38cfdcb51e2db94029c93865b21334f5fbf8a27984281a6',
-        'com.android.tools.external.com-intellij:intellij-core:26.3.2:intellij-core-26.3.2.jar:6c5ecc968230e9f4dcd0fef28885379feace1f0cd8130de6f61d649c86139bf3',
+        'com.android.tools.ddms:ddmlib:26.2.1:ddmlib-26.2.1.jar:a4bf0a29a19980bf27269465cc782064656750b77c26728f82f9e148b705218b',
-        'com.android.tools.external.com-intellij:kotlin-compiler:26.3.2:kotlin-compiler-26.3.2.jar:1007d9b07ccb49cd8eaf30fda10ed4681d4714f2f9ab2ecda39b4e539cc51bbe',
+        'com.android.tools.external.com-intellij:intellij-core:26.2.1:intellij-core-26.2.1.jar:4925ad1892c2687cb1a63427d440ef519c8c59215fefe0dc5d541d5d411fcafe',
-        'com.android.tools.external.org-jetbrains:uast:26.3.2:uast-26.3.2.jar:5d1833e562ea4f38a89708dfde695f0a162cbd39d003d3dde818c3fdc2b05317',
+        'com.android.tools.external.com-intellij:kotlin-compiler:26.2.1:kotlin-compiler-26.2.1.jar:daa064fd708f340ee25fb9823c4c74104ac77f1370b76d907eb9ae6daec0a2ae',
-        'com.android.tools.layoutlib:layoutlib-api:26.3.2:layoutlib-api-26.3.2.jar:d7e61e874ab95f5c350dd38b6a95b5c9dbe0083a02001884264cdb390cb255b8',
+        'com.android.tools.external.org-jetbrains:uast:26.2.1:uast-26.2.1.jar:f10f7258d2ab9189562cc0f9ad838c0378fdba439229173390a99de02ebac75b',
-        'com.android.tools.lint:lint-api:26.3.2:lint-api-26.3.2.jar:5867dfd7fb4a4e161a816a5d29d045f9b542d34594c00a1efec46fb4cd0e1033',
+        'com.android.tools.layoutlib:layoutlib-api:26.2.1:layoutlib-api-26.2.1.jar:ddbf4fca123733fa011595b1cc1f4ac2937ed327b60990711fafc33c775c2ade',
-        'com.android.tools.lint:lint-checks:26.3.2:lint-checks-26.3.2.jar:4b163b9c93790d2771e92ba8de58a0d9e0671ffcf2ccef3cf496efd442e27517',
+        'com.android.tools.lint:lint-api:26.2.1:lint-api-26.2.1.jar:3b57e739de567b98bc9ab56c2c0ee66fc026b4adf5843e8f9804ca0666a6f66e',
-        'com.android.tools.lint:lint-gradle-api:26.3.2:lint-gradle-api-26.3.2.jar:54cb282e0c054f9bed3f51302ce08b003c8ab7961dfd5a4f6de26c23cc23062f',
+        'com.android.tools.lint:lint-checks:26.2.1:lint-checks-26.2.1.jar:c86f4cc9aaee722ee4ad70062f7b5af91e9b041914af27adc09f545ab0fb3bc6',
-        'com.android.tools.lint:lint-gradle:26.3.2:lint-gradle-26.3.2.jar:bb139615f4ce97d42cc394b9389b49b76a6eb85be6785a5d272991543b519013',
+        'com.android.tools.lint:lint-gradle-api:26.2.1:lint-gradle-api-26.2.1.jar:2283e7af32e301565f2a797e531f0fc8c648077d457afb3ffdddbee638976c2f',
-        'com.android.tools.lint:lint:26.3.2:lint-26.3.2.jar:ef7b369f8a56a92ccb0f4c1c357666b9339e4a711a9d84747d446441746cfe4e',
+        'com.android.tools.lint:lint-gradle:26.2.1:lint-gradle-26.2.1.jar:8fd90b2f3ec788cbb9801c07ab3e1ea2255aa31a6093157d7ea0ff13d0315ecb',
-        'com.android.tools:annotations:26.3.2:annotations-26.3.2.jar:5bcce8e98b6a2f5ccf13ebcefd8f734e0b35f8b19e456575665631442ce1f7a1',
+        'com.android.tools.lint:lint-kotlin:26.2.1:lint-kotlin-26.2.1.jar:7a6a5d2b18f69cf1b900d857c2632b4c683713c533295933b8b759f8cab4a877',
-        'com.android.tools:common:26.3.2:common-26.3.2.jar:d9f8e7f0669e9a701568e3db6a87c89cf12d8fa6811c9991e969f950215ecfac',
+        'com.android.tools.lint:lint:26.2.1:lint-26.2.1.jar:7848b82ae988b90dee259ae7c7e86e05cbf52db6cd21c8bbd38ce7df08f3f8c5',
-        'com.android.tools:dvlib:26.3.2:dvlib-26.3.2.jar:d84aad56161c7773579303d69714ded6897c64c6ddfd7d456e453231e4dfe811',
+        'com.android.tools:annotations:26.2.1:annotations-26.2.1.jar:7391c6a1e080174b96e64ceb078dadd31ce4d8a2d2fee0ec65be202126f90f24',
-        'com.android.tools:repository:26.3.2:repository-26.3.2.jar:da611eeb06e9ab8750d25b9e2901e10db8e5ec6304eb4c8b7103d39e0921ea40',
+        'com.android.tools:common:26.2.1:common-26.2.1.jar:a50aab2d6411ff68f4004a87c7e93d87d8e980a0ec3b352246549897ea2d78e5',
-        'com.android.tools:sdk-common:26.3.2:sdk-common-26.3.2.jar:82823a3bf25e64fac33a286490f0cf5ac50c2cdb3c540149b030896bb44bf96c',
+        'com.android.tools:dvlib:26.2.1:dvlib-26.2.1.jar:72a83bf2839b1df9b1fbf67ba45d1bfb9f966cd774da4320c762b2be8f1688aa',
-        'com.android.tools:sdklib:26.3.2:sdklib-26.3.2.jar:424d15492af67321900963238646d27495ab60de2a5b19e6a416963bc5d6932b',
+        'com.android.tools:repository:26.2.1:repository-26.2.1.jar:fa74dae09103faef703df38550ad8fa244c5b6d1bf90d6198be932292b3d9cc1',
+        'com.android.tools:sdk-common:26.2.1:sdk-common-26.2.1.jar:759d4b292ca69a35cf961fca377b54158fc6c88108978006999442e80a011cf4',
+        'com.android.tools:sdklib:26.2.1:sdklib-26.2.1.jar:248df7ad5eac4aeb6f96c394c76760de4b7b89ac056e54d0c21a739368b91b45',
         '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:2.8.0:gson-2.8.0.jar:c6221763bd79c4f1c3dc7f750b5f29a0bb38b367b81314c4f71896e340c40825',
         'com.google.dagger:dagger-compiler:2.19:dagger-compiler-2.19.jar:27a4b202a2de908182edb261f8c0a264e08e5e4733d7514bc7fbf0d31da5c0fc',
         'com.google.dagger:dagger-producers:2.19:dagger-producers-2.19.jar:a17663abe0fc38b676026950907d4c5f5e2bf338375415861eaff6e3bdb0b768',
         'com.google.dagger:dagger-spi:2.19:dagger-spi-2.19.jar:e7a6379d82c841f6aac2866948ad1eed716528707814602842a8d844ce04e2e1',
         'com.google.dagger:dagger:2.19:dagger-2.19.jar:514b6f1e0727c6572e1d65cb27e4ae668b7aeaeb93a29515182965265b609939',
+        'com.google.errorprone:error_prone_annotations:2.0.18:error_prone_annotations-2.0.18.jar:cb4cfad870bf563a07199f3ebea5763f0dec440fcda0b318640b1feaa788656b',
         '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:guava:23.0:guava-23.0.jar:7baa80df284117e5b945b19b98d367a85ea7b7801bd358ff657946c3bd1b6596',
         '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:40ceb7157feb263949e0f503fe5f71689333a621021aa20ce0d0acee3badaa0f',
         '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',
@@ -66,22 +68,21 @@ 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:0.0.9:obfs4proxy-android-0.0.9.zip:9b7e9181535ea8d8bbe8ae6338e08cf4c5fc1e357a779393e0ce49586d459ae0',
+        'org.briarproject:obfs4proxy-android:0.0.7:obfs4proxy-android-0.0.7.zip:abdfb5d889d848de9bf214f9276abbf454808a505b870819eccc9a9e985bf617',
-        'org.briarproject:tor-android:0.3.5.8:tor-android-0.3.5.8.zip:42a13a6f185be1a62f42e3f30ce66a3c099ac5ec890a65e7593111b65b44a54a',
+        'org.briarproject:tor-android:0.3.4.8:tor-android-0.3.4.8.zip:989a0352d9d8d8172cd6c2137654e165e5d2beb10ed1211bab3814e224ad1926',
         '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:2.4.12:groovy-all-2.4.12.jar:6a56af4bd48903d56bec62821876cadefafd007360cc6bd0d8f7aa8d72b38be4',
-        'org.codehaus.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
         '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:1.3.21:kotlin-reflect-1.3.21.jar:a3065c822633191e0a3e3ee12a29bec234fc4b2864a6bb87ef48cce3e9e0c26a',
+        'org.jetbrains.kotlin:kotlin-reflect:1.2.0:kotlin-reflect-1.2.0.jar:4f48a872bad6e4d9c053f4ad610d11e4012ad7e58dc19a03dd5eb811f36069dd',
-        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.21:kotlin-stdlib-common-1.3.21.jar:cea61f7b611895e64f58569a9757fc0ab0d582f107211e1930e0ce2a0add52a7',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.2.71:kotlin-stdlib-common-1.2.71.jar:63999687ff2fce8a592dd180ffbbf8f1d21c26b4044c55cdc74ff3cf3b3cf328',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21:kotlin-stdlib-jdk7-1.3.21.jar:a87875604fd42140da6938ae4d35ee61081f4482536efc6d2615b8b626a198af',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.2.71:kotlin-stdlib-jdk7-1.2.71.jar:b136bd61b240e07d4d92ce00d3bd1dbf584400a7bf5f220c2f3cd22446858082',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21:kotlin-stdlib-jdk8-1.3.21.jar:5823ed66ac122a1c55442ebca5a209a843ccd87f562edc31a787f3d2e47f74d4',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.71:kotlin-stdlib-jdk8-1.2.71.jar:ac3c8abf47790b64b4f7e2509a53f0c145e061ac1612a597520535d199946ea9',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.3.21:kotlin-stdlib-1.3.21.jar:38ba2370d9f06f50433e06b2ca775b94473c2e2785f410926079ab793c72b034',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.2.71:kotlin-stdlib-1.2.71.jar:4c895c270b87f5fec2a2796e1d89c15407ee821de961527c28588bb46afbc68b',
         '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/src/main/java/org/briarproject/bramble/api/Bytes.java

@@ -1,13 +1,14 @@
 package org.briarproject.bramble.api;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.StringUtils;
 
 import java.util.Arrays;
 import java.util.Comparator;
 
 import javax.annotation.concurrent.ThreadSafe;
 
+import static org.briarproject.bramble.util.StringUtils.toHexString;
+
 /**
  * A wrapper around a byte array, to allow it to be stored in maps etc.
  */
@@ -56,8 +57,7 @@ public class Bytes implements Comparable<Bytes> {
 
 	@Override
 	public String toString() {
-		return getClass().getSimpleName() +
+		return getClass().getSimpleName() + "(" + toHexString(getBytes()) + ")";
-				"(" + StringUtils.toHexString(getBytes()) + ")";
 	}
 
 	public static class BytesComparator implements Comparator<Bytes> {

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

@@ -2,7 +2,6 @@ package org.briarproject.bramble.api;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.NoSuchElementException;
@@ -10,6 +9,8 @@ import java.util.Set;
 
 import javax.annotation.concurrent.NotThreadSafe;
 
+import static java.util.Collections.unmodifiableSet;
+
 @NotThreadSafe
 @NotNullByDefault
 public class Multiset<T> {
@@ -96,6 +97,6 @@ public class Multiset<T> {
 	 * is unmodifiable.
 	 */
 	public Set<T> keySet() {
-		return Collections.unmodifiableSet(map.keySet());
+		return unmodifiableSet(map.keySet());
 	}
 }

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

@@ -5,10 +5,11 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
 
 import java.util.Collection;
-import java.util.Collections;
 
 import javax.annotation.concurrent.Immutable;
 
+import static java.util.Collections.emptyList;
+
 @Immutable
 @NotNullByDefault
 public class BdfMessageContext {
@@ -23,7 +24,7 @@ public class BdfMessageContext {
 	}
 
 	public BdfMessageContext(BdfDictionary dictionary) {
-		this(dictionary, Collections.emptyList());
+		this(dictionary, emptyList());
 	}
 
 	public BdfDictionary getDictionary() {

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

@@ -16,6 +16,7 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
 
 @Immutable
@@ -23,7 +24,7 @@ import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOC
 public abstract class BdfMessageValidator implements MessageValidator {
 
 	protected static final Logger LOG =
-			Logger.getLogger(BdfMessageValidator.class.getName());
+			getLogger(BdfMessageValidator.class.getName());
 
 	protected final ClientHelper clientHelper;
 	protected final MetadataEncoder metadataEncoder;

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

@@ -0,0 +1,20 @@
+package org.briarproject.bramble.api.contact;
+
+import org.briarproject.bramble.api.identity.Author;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface ContactExchangeListener {
+
+	void contactExchangeSucceeded(Author remoteAuthor);
+
+	/**
+	 * The exchange failed because the contact already exists.
+	 */
+	void duplicateContact(Author remoteAuthor);
+
+	/**
+	 * A general failure.
+	 */
+	void contactExchangeFailed();
+}

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

@@ -41,7 +41,8 @@ public interface ContactExchangeTask {
 	/**
 	 * Exchanges contact information with a remote peer.
 	 */
-	void startExchange(LocalAuthor localAuthor, SecretKey masterSecret,
+	void startExchange(ContactExchangeListener listener,
+			LocalAuthor localAuthor, SecretKey masterSecret,
 			DuplexTransportConnection conn, TransportId transportId,
 			boolean alice);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/contact/event/ContactExchangeFailedEvent.java

@@ -1,32 +0,0 @@
-package org.briarproject.bramble.api.contact.event;
-
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.identity.Author;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.Nullable;
-
-@NotNullByDefault
-public class ContactExchangeFailedEvent extends Event {
-
-	@Nullable
-	private final Author duplicateRemoteAuthor;
-
-	public ContactExchangeFailedEvent(@Nullable Author duplicateRemoteAuthor) {
-		this.duplicateRemoteAuthor = duplicateRemoteAuthor;
-	}
-
-	public ContactExchangeFailedEvent() {
-		this(null);
-	}
-
-	@Nullable
-	public Author getDuplicateRemoteAuthor() {
-		return duplicateRemoteAuthor;
-	}
-
-	public boolean wasDuplicateContact() {
-		return duplicateRemoteAuthor != null;
-	}
-
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/event/ContactExchangeSucceededEvent.java

@@ -1,20 +0,0 @@
-package org.briarproject.bramble.api.contact.event;
-
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.identity.Author;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public class ContactExchangeSucceededEvent extends Event {
-
-	private final Author remoteAuthor;
-
-	public ContactExchangeSucceededEvent(Author remoteAuthor) {
-		this.remoteAuthor = remoteAuthor;
-	}
-
-	public Author getRemoteAuthor() {
-		return remoteAuthor;
-	}
-
-}

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfDictionary.java

@@ -4,7 +4,6 @@ import org.briarproject.bramble.api.Bytes;
 import org.briarproject.bramble.api.FormatException;
 
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.TreeMap;
 
 import javax.annotation.Nullable;
@@ -24,9 +23,9 @@ public class BdfDictionary extends TreeMap<String, Object> {
 	 * );
 	 * </pre>
 	 */
-	public static BdfDictionary of(Entry<String, ?>... entries) {
+	public static BdfDictionary of(BdfEntry... entries) {
 		BdfDictionary d = new BdfDictionary();
-		for (Entry<String, ?> e : entries) d.put(e.getKey(), e.getValue());
+		for (BdfEntry e : entries) d.put(e.getKey(), e.getValue());
 		return d;
 	}
 

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfList.java

@@ -4,12 +4,12 @@ import org.briarproject.bramble.api.Bytes;
 import org.briarproject.bramble.api.FormatException;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import static java.util.Arrays.asList;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 
 @NotThreadSafe
@@ -22,7 +22,7 @@ public class BdfList extends ArrayList<Object> {
 	 * </pre>
 	 */
 	public static BdfList of(Object... items) {
-		return new BdfList(Arrays.asList(items));
+		return new BdfList(asList(items));
 	}
 
 	public BdfList() {
@@ -33,6 +33,7 @@ public class BdfList extends ArrayList<Object> {
 		super(items);
 	}
 
+	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
 	private boolean isInRange(int index) {
 		return index >= 0 && index < size();
 	}

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

@@ -3,11 +3,12 @@ package org.briarproject.bramble.api.db;
 import org.briarproject.bramble.api.event.Event;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 
 import javax.annotation.concurrent.NotThreadSafe;
 
+import static java.util.Collections.emptyList;
+
 /**
  * A wrapper around a database transaction. Transactions are not thread-safe.
  */
@@ -53,7 +54,7 @@ public class Transaction {
 	 * Returns any events attached to the transaction.
 	 */
 	public List<Event> getEvents() {
-		if (events == null) return Collections.emptyList();
+		if (events == null) return emptyList();
 		return events;
 	}
 

bramble-api/src/main/java/org/briarproject/bramble/api/identity/Author.java

@@ -2,12 +2,12 @@ package org.briarproject.bramble.api.identity;
 
 import org.briarproject.bramble.api.Nameable;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.StringUtils;
 
 import javax.annotation.concurrent.Immutable;
 
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
 
 /**
  * A pseudonym for a user.
@@ -28,7 +28,7 @@ public class Author implements Nameable {
 
 	public Author(AuthorId id, int formatVersion, String name,
 			byte[] publicKey) {
-		int nameLength = StringUtils.toUtf8(name).length;
+		int nameLength = toUtf8(name).length;
 		if (nameLength == 0 || nameLength > MAX_AUTHOR_NAME_LENGTH)
 			throw new IllegalArgumentException();
 		if (publicKey.length == 0 || publicKey.length > MAX_PUBLIC_KEY_LENGTH)

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

@@ -1,6 +1,6 @@
 package org.briarproject.bramble.api.plugin;
 
-import org.briarproject.bramble.util.StringUtils;
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
 
 /**
  * Type-safe wrapper for a namespaced string that uniquely identifies a
@@ -11,12 +11,12 @@ public class TransportId {
 	/**
 	 * The maximum length of a transport identifier in UTF-8 bytes.
 	 */
-	public static int MAX_TRANSPORT_ID_LENGTH = 100;
+	public static final int MAX_TRANSPORT_ID_LENGTH = 100;
 
 	private final String id;
 
 	public TransportId(String id) {
-		int length = StringUtils.toUtf8(id).length;
+		int length = toUtf8(id).length;
 		if (length == 0 || length > MAX_TRANSPORT_ID_LENGTH)
 			throw new IllegalArgumentException();
 		this.id = id;

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

@@ -1,10 +1,11 @@
 package org.briarproject.bramble.api.sync;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.StringUtils;
 
 import javax.annotation.concurrent.Immutable;
 
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
+
 /**
  * Type-safe wrapper for a namespaced string that uniquely identifies a sync
  * client.
@@ -16,12 +17,12 @@ public class ClientId implements Comparable<ClientId> {
 	/**
 	 * The maximum length of a client identifier in UTF-8 bytes.
 	 */
-	public static int MAX_CLIENT_ID_LENGTH = 100;
+	public static final int MAX_CLIENT_ID_LENGTH = 100;
 
 	private final String id;
 
 	public ClientId(String id) {
-		int length = StringUtils.toUtf8(id).length;
+		int length = toUtf8(id).length;
 		if (length == 0 || length > MAX_CLIENT_ID_LENGTH)
 			throw new IllegalArgumentException();
 		this.id = id;

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

@@ -4,10 +4,11 @@ import org.briarproject.bramble.api.db.Metadata;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
-import java.util.Collections;
 
 import javax.annotation.concurrent.Immutable;
 
+import static java.util.Collections.emptyList;
+
 @Immutable
 @NotNullByDefault
 public class MessageContext {
@@ -22,7 +23,7 @@ public class MessageContext {
 	}
 
 	public MessageContext(Metadata metadata) {
-		this(metadata, Collections.emptyList());
+		this(metadata, emptyList());
 	}
 
 	public Metadata getMetadata() {

bramble-api/src/main/java/org/briarproject/bramble/util/IoUtils.java

@@ -16,12 +16,13 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 public class IoUtils {
 
-	private static final Logger LOG = Logger.getLogger(IoUtils.class.getName());
+	private static final Logger LOG = getLogger(IoUtils.class.getName());
 
 	public static void deleteFileOrDir(File f) {
 		if (f.isFile()) {

bramble-api/src/main/java/org/briarproject/bramble/util/ValidationUtils.java

@@ -7,13 +7,15 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
+
 @NotNullByDefault
 public class ValidationUtils {
 
 	public static void checkLength(@Nullable String s, int minLength,
 			int maxLength) throws FormatException {
 		if (s != null) {
-			int length = StringUtils.toUtf8(s).length;
+			int length = toUtf8(s).length;
 			if (length < minLength) throw new FormatException();
 			if (length > maxLength) throw new FormatException();
 		}
@@ -21,7 +23,7 @@ public class ValidationUtils {
 
 	public static void checkLength(@Nullable String s, int length)
 			throws FormatException {
-		if (s != null && StringUtils.toUtf8(s).length != length)
+		if (s != null && toUtf8(s).length != length)
 			throw new FormatException();
 	}
 

bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfDictionaryTest.java

@@ -8,6 +8,7 @@ import java.util.Collections;
 import java.util.Iterator;
 import java.util.Map.Entry;
 
+import static java.util.Collections.singletonMap;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
@@ -19,15 +20,15 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	public void testConstructors() {
 		assertEquals(Collections.<String, Object>emptyMap(),
 				new BdfDictionary());
-		assertEquals(Collections.singletonMap("foo", NULL_VALUE),
+		assertEquals(singletonMap("foo", NULL_VALUE),
-				new BdfDictionary(Collections.singletonMap("foo", NULL_VALUE)));
+				new BdfDictionary(singletonMap("foo", NULL_VALUE)));
 	}
 
 	@Test
 	public void testFactoryMethod() {
 		assertEquals(Collections.<String, Object>emptyMap(),
 				BdfDictionary.of());
-		assertEquals(Collections.singletonMap("foo", NULL_VALUE),
+		assertEquals(singletonMap("foo", NULL_VALUE),
 				BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)));
 	}
 
@@ -67,7 +68,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testKeySetIteratorIsOrderedByKeys() throws Exception {
+	public void testKeySetIteratorIsOrderedByKeys() {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -86,7 +87,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testValuesIteratorIsOrderedByKeys() throws Exception {
+	public void testValuesIteratorIsOrderedByKeys() {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -105,7 +106,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testEntrySetIteratorIsOrderedByKeys() throws Exception {
+	public void testEntrySetIteratorIsOrderedByKeys() {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);

bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfListTest.java

@@ -5,26 +5,31 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;
 
-import java.util.Arrays;
+import java.util.Random;
-import java.util.Collections;
 
+import static java.util.Arrays.asList;
+import static java.util.Collections.emptyList;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
+import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
+import static org.briarproject.bramble.util.StringUtils.getRandomString;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 
 public class BdfListTest extends BrambleTestCase {
 
+	private final Random random = new Random();
+
 	@Test
 	public void testConstructors() {
-		assertEquals(Collections.emptyList(), new BdfList());
+		assertEquals(emptyList(), new BdfList());
-		assertEquals(Arrays.asList(1, 2, NULL_VALUE),
+		assertEquals(asList(1, 2, NULL_VALUE),
-				new BdfList(Arrays.asList(1, 2, NULL_VALUE)));
+				new BdfList(asList(1, 2, NULL_VALUE)));
 	}
 
 	@Test
 	public void testFactoryMethod() {
-		assertEquals(Collections.emptyList(), BdfList.of());
+		assertEquals(emptyList(), BdfList.of());
-		assertEquals(Arrays.asList(1, 2, NULL_VALUE),
+		assertEquals(asList(1, 2, NULL_VALUE),
 				BdfList.of(1, 2, NULL_VALUE));
 	}
 
@@ -64,22 +69,21 @@ public class BdfListTest extends BrambleTestCase {
 	}
 
 	@Test
-	@SuppressWarnings("ConstantConditions")
+	public void testIndexOutOfBoundsReturnsDefaultValue() {
-	public void testIndexOutOfBoundsReturnsDefaultValue() throws Exception {
 		BdfList list = BdfList.of(1, 2, 3);
-		boolean defaultBoolean = true;
+		boolean defaultBoolean = random.nextBoolean();
 		assertEquals(defaultBoolean, list.getBoolean(-1, defaultBoolean));
 		assertEquals(defaultBoolean, list.getBoolean(3, defaultBoolean));
-		Long defaultLong = 123L;
+		Long defaultLong = random.nextLong();
 		assertEquals(defaultLong, list.getLong(-1, defaultLong));
 		assertEquals(defaultLong, list.getLong(3, defaultLong));
-		Double defaultDouble = 1.23;
+		Double defaultDouble = random.nextDouble();
 		assertEquals(defaultDouble, list.getDouble(-1, defaultDouble));
 		assertEquals(defaultDouble, list.getDouble(3, defaultDouble));
-		String defaultString = "123";
+		String defaultString = getRandomString(123);
 		assertEquals(defaultString, list.getString(-1, defaultString));
 		assertEquals(defaultString, list.getString(3, defaultString));
-		byte[] defaultBytes = new byte[] {1, 2, 3};
+		byte[] defaultBytes = getRandomBytes(123);
 		assertArrayEquals(defaultBytes, list.getRaw(-1, defaultBytes));
 		assertArrayEquals(defaultBytes, list.getRaw(3, defaultBytes));
 		BdfList defaultList = BdfList.of(1, 2, 3);
@@ -95,18 +99,17 @@ public class BdfListTest extends BrambleTestCase {
 	}
 
 	@Test
-	@SuppressWarnings("ConstantConditions")
+	public void testWrongTypeReturnsDefaultValue() {
-	public void testWrongTypeReturnsDefaultValue() throws Exception {
 		BdfList list = BdfList.of(1, 2, 3, true);
-		boolean defaultBoolean = true;
+		boolean defaultBoolean = random.nextBoolean();
 		assertEquals(defaultBoolean, list.getBoolean(0, defaultBoolean));
-		Long defaultLong = 123L;
+		Long defaultLong = random.nextLong();
 		assertEquals(defaultLong, list.getLong(3, defaultLong));
-		Double defaultDouble = 1.23;
+		Double defaultDouble = random.nextDouble();
 		assertEquals(defaultDouble, list.getDouble(0, defaultDouble));
-		String defaultString = "123";
+		String defaultString = getRandomString(123);
 		assertEquals(defaultString, list.getString(0, defaultString));
-		byte[] defaultBytes = new byte[] {1, 2, 3};
+		byte[] defaultBytes = getRandomBytes(123);
 		assertArrayEquals(defaultBytes, list.getRaw(0, defaultBytes));
 		BdfList defaultList = BdfList.of(1, 2, 3);
 		assertEquals(defaultList, list.getList(0, defaultList));

bramble-api/src/test/java/org/briarproject/bramble/test/TestUtils.java

@@ -12,12 +12,10 @@ import org.briarproject.bramble.api.sync.Group;
 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.util.IoUtils;
 
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -25,6 +23,7 @@ import java.util.Random;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import static java.util.Arrays.asList;
+import static java.util.Collections.sort;
 import static org.briarproject.bramble.api.identity.Author.FORMAT_VERSION;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
@@ -33,6 +32,7 @@ import static org.briarproject.bramble.api.properties.TransportPropertyConstants
 import static org.briarproject.bramble.api.sync.ClientId.MAX_CLIENT_ID_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_GROUP_DESCRIPTOR_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_BODY_LENGTH;
+import static org.briarproject.bramble.util.IoUtils.deleteFileOrDir;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 
 public class TestUtils {
@@ -48,8 +48,10 @@ public class TestUtils {
 	}
 
 	public static void deleteTestDirectory(File testDir) {
-		IoUtils.deleteFileOrDir(testDir);
+		deleteFileOrDir(testDir);
-		testDir.getParentFile().delete(); // Delete if empty
+		// Delete parent directory only if it's empty
+		//noinspection ResultOfMethodCallIgnored
+		testDir.getParentFile().delete();
 	}
 
 	public static byte[] getRandomBytes(int length) {
@@ -145,7 +147,7 @@ public class TestUtils {
 		if (size == 0) throw new IllegalArgumentException();
 		List<Double> sorted = new ArrayList<>(size);
 		for (Number n : samples) sorted.add(n.doubleValue());
-		Collections.sort(sorted);
+		sort(sorted);
 		if (size % 2 == 1) return sorted.get(size / 2);
 		double low = sorted.get(size / 2 - 1), high = sorted.get(size / 2);
 		return (low + high) / 2;

bramble-core/build.gradle

@@ -15,6 +15,7 @@ dependencies {
 	implementation 'org.bitlet:weupnp:0.1.4'
 	implementation 'net.i2p.crypto:eddsa:0.2.0'
 	implementation 'org.whispersystems:curve25519-java:0.5.0'
+	implementation 'org.briarproject:jtorctl:0.3'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.19'
 

bramble-core/src/main/java/net/freehaven/tor/control/.cvsignore

@@ -1 +0,0 @@
-*.class

bramble-core/src/main/java/net/freehaven/tor/control/Bytes.java

@@ -1,114 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-import java.util.Arrays;
-import java.util.List;
-
-/**
- * Static class to do bytewise structure manipulation in Java.
- */
-/* XXXX There must be a better way to do most of this.
- * XXXX The string logic here uses default encoding, which is stupid.
- */
-final class Bytes {
-
-    /** Write the two-byte value in 's' into the byte array 'ba', starting at
-     * the index 'pos'. */
-    public static void setU16(byte[] ba, int pos, short s) {
-        ba[pos]   = (byte)((s >> 8) & 0xff);
-        ba[pos+1] = (byte)((s     ) & 0xff);
-    }
-
-    /** Write the four-byte value in 'i' into the byte array 'ba', starting at
-     * the index 'pos'. */
-    public static void setU32(byte[] ba, int pos, int i) {
-        ba[pos]   = (byte)((i >> 24) & 0xff);
-        ba[pos+1] = (byte)((i >> 16) & 0xff);
-        ba[pos+2] = (byte)((i >>  8) & 0xff);
-        ba[pos+3] = (byte)((i      ) & 0xff);
-    }
-
-    /** Return the four-byte value starting at index 'pos' within 'ba' */
-    public static int getU32(byte[] ba, int pos) {
-        return
-            ((ba[pos  ]&0xff)<<24) |
-            ((ba[pos+1]&0xff)<<16) |
-            ((ba[pos+2]&0xff)<< 8)  |
-            ((ba[pos+3]&0xff));
-    }
-
-    public static String getU32S(byte[] ba, int pos) {
-        return String.valueOf( (getU32(ba,pos))&0xffffffffL );
-    }
-
-    /** Return the two-byte value starting at index 'pos' within 'ba' */
-    public static int getU16(byte[] ba, int pos) {
-        return
-            ((ba[pos  ]&0xff)<<8) |
-            ((ba[pos+1]&0xff));
-    }
-
-    /** Return the string starting at position 'pos' of ba and extending
-     * until a zero byte or the end of the string. */
-    public static String getNulTerminatedStr(byte[] ba, int pos) {
-        int len, maxlen = ba.length-pos;
-        for (len=0; len<maxlen; ++len) {
-            if (ba[pos+len] == 0)
-                break;
-        }
-        return new String(ba, pos, len);
-    }
-
-    /**
-     * Read bytes from 'ba' starting at 'pos', dividing them into strings
-     * along the character in 'split' and writing them into 'lst'
-     */
-    public static void splitStr(List<String> lst, byte[] ba, int pos, byte split) {
-        while (pos < ba.length && ba[pos] != 0) {
-            int len;
-            for (len=0; pos+len < ba.length; ++len) {
-                if (ba[pos+len] == 0 || ba[pos+len] == split)
-                    break;
-            }
-            if (len>0)
-                lst.add(new String(ba, pos, len));
-            pos += len;
-            if (ba[pos] == split)
-                ++pos;
-        }
-    }
-
-    /**
-     * Read bytes from 'ba' starting at 'pos', dividing them into strings
-     * along the character in 'split' and writing them into 'lst'
-     */
-    public static List<String> splitStr(List<String> lst, String str) {
-        // split string on spaces, include trailing/leading
-        String[] tokenArray = str.split(" ", -1);
-        if (lst == null) {
-            lst = Arrays.asList( tokenArray );
-        } else {
-            lst.addAll( Arrays.asList( tokenArray ) );
-        }
-        return lst;
-    }
-
-    private static final char[] NYBBLES = {
-        '0', '1', '2', '3', '4', '5', '6', '7',
-        '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
-    };
-
-    public static final String hex(byte[] ba) {
-        StringBuffer buf = new StringBuffer();
-        for (int i = 0; i < ba.length; ++i) {
-            int b = (ba[i]) & 0xff;
-            buf.append(NYBBLES[b >> 4]);
-            buf.append(NYBBLES[b&0x0f]);
-        }
-        return buf.toString();
-    }
-
-    private Bytes() {};
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/ConfigEntry.java

@@ -1,20 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-/** A single key-value pair from Tor's configuration. */
-public class ConfigEntry {
-    public ConfigEntry(String k, String v) {
-        key = k;
-        value = v;
-        is_default = false;
-    }
-    public ConfigEntry(String k) {
-        key = k;
-        value = "";
-        is_default = true;
-    }
-    public final String key;
-    public final String value;
-    public final boolean is_default;
-}

bramble-core/src/main/java/net/freehaven/tor/control/EventHandler.java

@@ -1,75 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-/**
- * Abstract interface whose methods are invoked when Tor sends us an event.
- *
- * @see TorControlConnection#setEventHandler
- * @see TorControlConnection#setEvents
- */
-public interface EventHandler {
-    /**
-     * Invoked when a circuit's status has changed.
-     * Possible values for <b>status</b> are:
-     * <ul>
-     *   <li>"LAUNCHED" :  circuit ID assigned to new circuit</li>
-     *   <li>"BUILT"    :  all hops finished, can now accept streams</li>
-     *   <li>"EXTENDED" :  one more hop has been completed</li>
-     *   <li>"FAILED"   :  circuit closed (was not built)</li>
-     *   <li>"CLOSED"   :  circuit closed (was built)</li>
-     *	</ul>
-     * 
-     * <b>circID</b> is the alphanumeric identifier of the affected circuit,
-     * and <b>path</b> is a comma-separated list of alphanumeric ServerIDs.
-     */
-    public void circuitStatus(String status, String circID, String path);
-    /**
-     * Invoked when a stream's status has changed.
-     * Possible values for <b>status</b> are:
-     * <ul>
-     *   <li>"NEW"         :  New request to connect</li>
-     *   <li>"NEWRESOLVE"  :  New request to resolve an address</li>
-     *   <li>"SENTCONNECT" :  Sent a connect cell along a circuit</li>
-     *   <li>"SENTRESOLVE" :  Sent a resolve cell along a circuit</li>
-     *   <li>"SUCCEEDED"   :  Received a reply; stream established</li>
-     *   <li>"FAILED"      :  Stream failed and not retriable.</li>
-     *   <li>"CLOSED"      :  Stream closed</li>
-     *   <li>"DETACHED"    :  Detached from circuit; still retriable.</li>
-     *	</ul>
-     *
-     * <b>streamID</b> is the alphanumeric identifier of the affected stream,
-     * and its <b>target</b> is specified as address:port.
-     */
-    public void streamStatus(String status, String streamID, String target);
-    /**
-     * Invoked when the status of a connection to an OR has changed.
-     * Possible values for <b>status</b> are ["LAUNCHED" | "CONNECTED" | "FAILED" | "CLOSED"].
-     * <b>orName</b> is the alphanumeric identifier of the OR affected.
-     */
-    public void orConnStatus(String status, String orName);
-    /**
-     * Invoked once per second. <b>read</b> and <b>written</b> are
-     * the number of bytes read and written, respectively, in
-     * the last second.
-     */
-    public void bandwidthUsed(long read, long written);
-    /**
-     * Invoked whenever Tor learns about new ORs.  The <b>orList</b> object
-     * contains the alphanumeric ServerIDs associated with the new ORs.
-     */
-    public void newDescriptors(java.util.List<String> orList);
-    /**
-     * Invoked when Tor logs a message.
-     * <b>severity</b> is one of ["DEBUG" | "INFO" | "NOTICE" | "WARN" | "ERR"],
-     * and <b>msg</b> is the message string.
-     */
-    public void message(String severity, String msg);
-    /**
-     * Invoked when an unspecified message is received.
-     * <type> is the message type, and <msg> is the message string.
-     */
-    public void unrecognized(String type, String msg);
-
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/NullEventHandler.java

@@ -1,18 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-/**
- * Implementation of EventHandler that ignores all events.  Useful
- * when you only want to override one method.
- */
-public class NullEventHandler implements EventHandler {
-    public void circuitStatus(String status, String circID, String path) {}
-    public void streamStatus(String status, String streamID, String target) {}
-    public void orConnStatus(String status, String orName) {}
-    public void bandwidthUsed(long read, long written) {}
-    public void newDescriptors(java.util.List<String> orList) {}
-    public void message(String severity, String msg) {}
-    public void unrecognized(String type, String msg) {}
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/PasswordDigest.java

@@ -1,98 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.security.SecureRandom;
-
-/**
- * A hashed digest of a secret password (used to set control connection
- * security.)
- *
- * For the actual hashing algorithm, see RFC2440's secret-to-key conversion.
- */
-public class PasswordDigest {
-
-    private final byte[] secret;
-    private final String hashedKey;
-
-    /** Return a new password digest with a random secret and salt. */
-    public static PasswordDigest generateDigest() {
-        byte[] secret = new byte[20];
-        SecureRandom rng = new SecureRandom();
-        rng.nextBytes(secret);
-        return new PasswordDigest(secret);
-    }
-
-    /** Construct a new password digest with a given secret and random salt */
-    public PasswordDigest(byte[] secret) {
-        this(secret, null);
-    }
-
-    /** Construct a new password digest with a given secret and random salt.
-     * Note that the 9th byte of the specifier determines the number of hash
-     * iterations as in RFC2440.
-     */
-    public PasswordDigest(byte[] secret, byte[] specifier) {
-        this.secret = secret.clone();
-        if (specifier == null) {
-            specifier = new byte[9];
-            SecureRandom rng = new SecureRandom();
-            rng.nextBytes(specifier);
-            specifier[8] = 96;
-        }
-        hashedKey = "16:"+encodeBytes(secretToKey(secret, specifier));
-    }
-
-    /** Return the secret used to generate this password hash.
-     */
-    public byte[] getSecret() {
-        return secret.clone();
-    }
-
-    /** Return the hashed password in the format used by Tor. */
-    public String getHashedPassword() {
-        return hashedKey;
-    }
-
-    /** Parameter used by RFC2440's s2k algorithm. */
-    private static final int EXPBIAS = 6;
-
-    /** Implement rfc2440 s2k */
-    public static byte[] secretToKey(byte[] secret, byte[] specifier) {
-        MessageDigest d;
-        try {
-            d = MessageDigest.getInstance("SHA-1");
-        } catch (NoSuchAlgorithmException ex) {
-            throw new RuntimeException("Can't run without sha-1.");
-        }
-        int c = (specifier[8])&0xff;
-        int count = (16 + (c&15)) << ((c>>4) + EXPBIAS);
-
-        byte[] tmp = new byte[8+secret.length];
-        System.arraycopy(specifier, 0, tmp, 0, 8);
-        System.arraycopy(secret, 0, tmp, 8, secret.length);
-        while (count > 0) {
-            if (count >= tmp.length) {
-                d.update(tmp);
-                count -= tmp.length;
-            } else {
-                d.update(tmp, 0, count);
-                count = 0;
-            }
-        }
-        byte[] key = new byte[20+9];
-        System.arraycopy(d.digest(), 0, key, 9, 20);
-        System.arraycopy(specifier, 0, key, 0, 9);
-        return key;
-    }
-
-    /** Return a hexadecimal encoding of a byte array. */
-    // XXX There must be a better way to do this in Java.
-    private static final String encodeBytes(byte[] ba) {
-        return Bytes.hex(ba);
-    }
-
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/README

@@ -1,4 +0,0 @@
-We broke the version detection stuff in Tor 0.1.2.16 / 0.2.0.4-alpha.
-Somebody should rip out the v0 control protocol stuff from here, and
-it should start working again. -RD
-

bramble-core/src/main/java/net/freehaven/tor/control/TorControlCommands.java

@@ -1,151 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-/** Interface defining constants used by the Tor controller protocol.
- */
-// XXXX Take documentation for these from control-spec.txt
-public interface TorControlCommands {
-
-    public static final short CMD_ERROR = 0x0000;
-    public static final short CMD_DONE = 0x0001;
-    public static final short CMD_SETCONF = 0x0002;
-    public static final short CMD_GETCONF = 0x0003;
-    public static final short CMD_CONFVALUE = 0x0004;
-    public static final short CMD_SETEVENTS = 0x0005;
-    public static final short CMD_EVENT = 0x0006;
-    public static final short CMD_AUTH = 0x0007;
-    public static final short CMD_SAVECONF = 0x0008;
-    public static final short CMD_SIGNAL = 0x0009;
-    public static final short CMD_MAPADDRESS = 0x000A;
-    public static final short CMD_GETINFO = 0x000B;
-    public static final short CMD_INFOVALUE = 0x000C;
-    public static final short CMD_EXTENDCIRCUIT = 0x000D;
-    public static final short CMD_ATTACHSTREAM = 0x000E;
-    public static final short CMD_POSTDESCRIPTOR = 0x000F;
-    public static final short CMD_FRAGMENTHEADER = 0x0010;
-    public static final short CMD_FRAGMENT = 0x0011;
-    public static final short CMD_REDIRECTSTREAM = 0x0012;
-    public static final short CMD_CLOSESTREAM = 0x0013;
-    public static final short CMD_CLOSECIRCUIT = 0x0014;
-
-    public static final String[] CMD_NAMES = {
-        "ERROR",
-        "DONE",
-        "SETCONF",
-        "GETCONF",
-        "CONFVALUE",
-        "SETEVENTS",
-        "EVENT",
-        "AUTH",
-        "SAVECONF",
-        "SIGNAL",
-        "MAPADDRESS",
-        "GETINFO",
-        "INFOVALUE",
-        "EXTENDCIRCUIT",
-        "ATTACHSTREAM",
-        "POSTDESCRIPTOR",
-        "FRAGMENTHEADER",
-        "FRAGMENT",
-        "REDIRECTSTREAM",
-        "CLOSESTREAM",
-        "CLOSECIRCUIT",
-    };
-
-    public static final short EVENT_CIRCSTATUS = 0x0001;
-    public static final short EVENT_STREAMSTATUS = 0x0002;
-    public static final short EVENT_ORCONNSTATUS = 0x0003;
-    public static final short EVENT_BANDWIDTH = 0x0004;
-    public static final short EVENT_NEWDESCRIPTOR = 0x0006;
-    public static final short EVENT_MSG_DEBUG = 0x0007;
-    public static final short EVENT_MSG_INFO = 0x0008;
-    public static final short EVENT_MSG_NOTICE = 0x0009;
-    public static final short EVENT_MSG_WARN = 0x000A;
-    public static final short EVENT_MSG_ERROR = 0x000B;
-
-    public static final String[] EVENT_NAMES = {
-        "(0)",
-        "CIRC",
-        "STREAM",
-        "ORCONN",
-        "BW",
-        "OLDLOG",
-        "NEWDESC",
-        "DEBUG",
-        "INFO",
-        "NOTICE",
-        "WARN",
-        "ERR",
-    };
-
-    public static final byte CIRC_STATUS_LAUNCHED = 0x01;
-    public static final byte CIRC_STATUS_BUILT = 0x02;
-    public static final byte CIRC_STATUS_EXTENDED = 0x03;
-    public static final byte CIRC_STATUS_FAILED = 0x04;
-    public static final byte CIRC_STATUS_CLOSED = 0x05;
-
-    public static final String[] CIRC_STATUS_NAMES = {
-        "LAUNCHED",
-        "BUILT",
-        "EXTENDED",
-        "FAILED",
-        "CLOSED",
-    };
-
-    public static final byte STREAM_STATUS_SENT_CONNECT = 0x00;
-    public static final byte STREAM_STATUS_SENT_RESOLVE = 0x01;
-    public static final byte STREAM_STATUS_SUCCEEDED = 0x02;
-    public static final byte STREAM_STATUS_FAILED = 0x03;
-    public static final byte STREAM_STATUS_CLOSED = 0x04;
-    public static final byte STREAM_STATUS_NEW_CONNECT = 0x05;
-    public static final byte STREAM_STATUS_NEW_RESOLVE = 0x06;
-    public static final byte STREAM_STATUS_DETACHED = 0x07;
-
-    public static final String[] STREAM_STATUS_NAMES = {
-        "SENT_CONNECT",
-        "SENT_RESOLVE",
-        "SUCCEEDED",
-        "FAILED",
-        "CLOSED",
-        "NEW_CONNECT",
-        "NEW_RESOLVE",
-        "DETACHED"
-    };
-
-    public static final byte OR_CONN_STATUS_LAUNCHED = 0x00;
-    public static final byte OR_CONN_STATUS_CONNECTED = 0x01;
-    public static final byte OR_CONN_STATUS_FAILED = 0x02;
-    public static final byte OR_CONN_STATUS_CLOSED = 0x03;
-
-    public static final String[] OR_CONN_STATUS_NAMES = {
-        "LAUNCHED","CONNECTED","FAILED","CLOSED"
-    };
-
-    public static final byte SIGNAL_HUP = 0x01;
-    public static final byte SIGNAL_INT = 0x02;
-    public static final byte SIGNAL_USR1 = 0x0A;
-    public static final byte SIGNAL_USR2 = 0x0C;
-    public static final byte SIGNAL_TERM = 0x0F;
-
-    public static final String ERROR_MSGS[] = {
-        "Unspecified error",
-        "Internal error",
-        "Unrecognized message type",
-        "Syntax error",
-        "Unrecognized configuration key",
-        "Invalid configuration value",
-        "Unrecognized byte code",
-        "Unauthorized",
-        "Failed authentication attempt",
-        "Resource exhausted",
-        "No such stream",
-        "No such circuit",
-        "No such OR",
-    };
-
-    public static final String HS_ADDRESS = "onionAddress";
-    public static final String HS_PRIVKEY = "onionPrivKey";
-
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/TorControlConnection.java

@@ -1,998 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.io.OutputStreamWriter;
-import java.io.PrintStream;
-import java.io.PrintWriter;
-import java.io.Reader;
-import java.io.Writer;
-import java.net.Socket;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Map;
-import java.util.StringTokenizer;
-import java.util.logging.Logger;
-
-import static java.util.logging.Logger.getLogger;
-
-/**
- * A connection to a running Tor process as specified in control-spec.txt.
- */
-public class TorControlConnection implements TorControlCommands {
-
-	private static final Logger LOG =
-			getLogger(TorControlConnection.class.getName());
-
-	private final LinkedList<Waiter> waiters;
-	private final BufferedReader input;
-	private final Writer output;
-
-	private ControlParseThread thread; // Locking: this
-
-	private volatile EventHandler handler;
-	private volatile PrintWriter debugOutput;
-	private volatile IOException parseThreadException;
-
-	static class Waiter {
-
-		List<ReplyLine> response; // Locking: this
-		boolean interrupted;
-
-		List<ReplyLine> getResponse() throws InterruptedException {
-			LOG.info("Entering synchronized (waiter " + hashCode() + ")");
-			synchronized (this) {
-				LOG.info("Entered synchronized (waiter " + hashCode() + ")");
-				while (response == null) {
-					LOG.info("Waiter " + hashCode() + " waiting for response");
-					wait();
-					if (interrupted) {
-						LOG.info("Waiter " + hashCode() + " interrupted");
-						throw new InterruptedException();
-					}
-				}
-				LOG.info("Waiter " + hashCode() + " got response " + response);
-				LOG.info("Leaving synchronized (waiter " + hashCode() + ")");
-				return response;
-			}
-		}
-
-		void setResponse(List<ReplyLine> response) {
-			LOG.info("Entering synchronized (waiter " + hashCode() + ")");
-			synchronized (this) {
-				LOG.info("Entered synchronized (waiter " + hashCode() + ")");
-				LOG.info("Setting response for waiter " + hashCode() + ": "
-						+ response);
-				this.response = response;
-				notifyAll();
-				LOG.info("Leaving synchronized (waiter " + hashCode() + ")");
-			}
-		}
-
-		void interrupt() {
-			LOG.info("Entering synchronized (waiter " + hashCode() + ")");
-			synchronized (this) {
-				LOG.info("Entered synchronized (waiter " + hashCode() + ")");
-				LOG.info("Interrupting waiter " + hashCode());
-				interrupted = true;
-				notifyAll();
-				LOG.info("Leaving synchronized (waiter " + hashCode() + ")");
-			}
-		}
-	}
-
-	static class ReplyLine {
-
-		final String status;
-		final String msg;
-		final String rest;
-
-		ReplyLine(String status, String msg, String rest) {
-			this.status = status;
-			this.msg = msg;
-			this.rest = rest;
-		}
-
-		@Override
-		public String toString() {
-			return status + " " + msg + " " + rest;
-		}
-	}
-
-	/**
-	 * Create a new TorControlConnection to communicate with Tor over
-	 * a given socket.  After calling this constructor, it is typical to
-	 * call launchThread and authenticate.
-	 */
-	public TorControlConnection(Socket connection) throws IOException {
-		this(connection.getInputStream(), connection.getOutputStream());
-	}
-
-	/**
-	 * Create a new TorControlConnection to communicate with Tor over
-	 * an arbitrary pair of data streams.
-	 */
-	public TorControlConnection(InputStream i, OutputStream o) {
-		this(new InputStreamReader(i), new OutputStreamWriter(o));
-	}
-
-	public TorControlConnection(Reader i, Writer o) {
-		this.output = o;
-		if (i instanceof BufferedReader)
-			this.input = (BufferedReader) i;
-		else
-			this.input = new BufferedReader(i);
-		this.waiters = new LinkedList<>();
-	}
-
-	protected final void writeEscaped(String s) throws IOException {
-		StringTokenizer st = new StringTokenizer(s, "\n");
-		while (st.hasMoreTokens()) {
-			String line = st.nextToken();
-			if (line.startsWith("."))
-				line = "." + line;
-			if (line.endsWith("\r"))
-				line += "\n";
-			else
-				line += "\r\n";
-			if (debugOutput != null)
-				debugOutput.print(">> " + line);
-			output.write(line);
-		}
-		output.write(".\r\n");
-		if (debugOutput != null)
-			debugOutput.print(">> .\n");
-	}
-
-	protected static String quote(String s) {
-		StringBuffer sb = new StringBuffer("\"");
-		for (int i = 0; i < s.length(); ++i) {
-			char c = s.charAt(i);
-			switch (c) {
-				case '\r':
-				case '\n':
-				case '\\':
-				case '\"':
-					sb.append('\\');
-			}
-			sb.append(c);
-		}
-		sb.append('\"');
-		return sb.toString();
-	}
-
-	protected final ArrayList<ReplyLine> readReply() throws IOException {
-		ArrayList<ReplyLine> reply = new ArrayList<>();
-		char c;
-		do {
-			String line = input.readLine();
-			if (line == null) {
-				// if line is null, the end of the stream has been reached, i.e.
-				// the connection to Tor has been closed!
-				if (reply.isEmpty()) {
-					// nothing received so far, can exit cleanly
-					return reply;
-				}
-				// received half of a reply before the connection broke down
-				throw new TorControlSyntaxError("Connection to Tor " +
-						" broke down while receiving reply!");
-			}
-			if (debugOutput != null)
-				debugOutput.println("<< " + line);
-			if (line.length() < 4)
-				throw new TorControlSyntaxError(
-						"Line (\"" + line + "\") too short");
-			String status = line.substring(0, 3);
-			c = line.charAt(3);
-			String msg = line.substring(4);
-			String rest = null;
-			if (c == '+') {
-				StringBuffer data = new StringBuffer();
-				while (true) {
-					line = input.readLine();
-					if (debugOutput != null)
-						debugOutput.print("<< " + line);
-					if (line.equals("."))
-						break;
-					else if (line.startsWith("."))
-						line = line.substring(1);
-					data.append(line).append('\n');
-				}
-				rest = data.toString();
-			}
-			reply.add(new ReplyLine(status, msg, rest));
-		} while (c != ' ');
-
-		return reply;
-	}
-
-	protected List<ReplyLine> sendAndWaitForResponse(String s,
-			String rest) throws IOException {
-		LOG.info("Entering synchronized (connection)");
-		synchronized (this) {
-			LOG.info("Entered synchronized (connection)");
-			LOG.info("Sending '" + s + "', '" + rest +
-					"' and waiting for response");
-			if (parseThreadException != null) {
-				LOG.info("Throwing previously caught exception "
-						+ parseThreadException);
-				throw parseThreadException;
-			}
-			checkThread();
-			Waiter w = new Waiter();
-			LOG.info("Created waiter " + w.hashCode());
-			if (debugOutput != null)
-				debugOutput.print(">> " + s);
-			LOG.info("Entering synchronized (waiters)");
-			synchronized (waiters) {
-				LOG.info("Entered synchronized (waiters)");
-				output.write(s);
-				LOG.info("Wrote '" + s + "'");
-				if (rest != null) {
-					writeEscaped(rest);
-					LOG.info("Wrote escaped '" + rest + "'");
-				}
-				output.flush();
-				LOG.info("Flushed output");
-				waiters.addLast(w);
-				LOG.info("Added waiter, " + waiters.size() + " waiting");
-				LOG.info("Leaving synchronized (waiters)");
-			}
-			List<ReplyLine> lst;
-			try {
-				LOG.info("Getting response from waiter " + w.hashCode());
-				lst = w.getResponse();
-				LOG.info("Got response from waiter " + w.hashCode() + ": " +
-						lst);
-			} catch (InterruptedException ex) {
-				throw new IOException("Interrupted");
-			}
-			for (Iterator<ReplyLine> i = lst.iterator(); i.hasNext(); ) {
-				ReplyLine c = i.next();
-				if (!c.status.startsWith("2"))
-					throw new TorControlError("Error reply: " + c.msg);
-			}
-			LOG.info("Leaving synchronized (connection)");
-			return lst;
-		}
-	}
-
-	/**
-	 * Helper: decode a CMD_EVENT command and dispatch it to our
-	 * EventHandler (if any).
-	 */
-	protected void handleEvent(ArrayList<ReplyLine> events) {
-		if (handler == null)
-			return;
-
-		for (Iterator<ReplyLine> i = events.iterator(); i.hasNext(); ) {
-			ReplyLine line = i.next();
-			int idx = line.msg.indexOf(' ');
-			String tp = line.msg.substring(0, idx).toUpperCase();
-			String rest = line.msg.substring(idx + 1);
-			if (tp.equals("CIRC")) {
-				List<String> lst = Bytes.splitStr(null, rest);
-				handler.circuitStatus(lst.get(1),
-						lst.get(0),
-						lst.get(1).equals("LAUNCHED")
-								|| lst.size() < 3 ? ""
-								: lst.get(2));
-			} else if (tp.equals("STREAM")) {
-				List<String> lst = Bytes.splitStr(null, rest);
-				handler.streamStatus(lst.get(1),
-						lst.get(0),
-						lst.get(3));
-				// XXXX circID.
-			} else if (tp.equals("ORCONN")) {
-				List<String> lst = Bytes.splitStr(null, rest);
-				handler.orConnStatus(lst.get(1), lst.get(0));
-			} else if (tp.equals("BW")) {
-				List<String> lst = Bytes.splitStr(null, rest);
-				handler.bandwidthUsed(Integer.parseInt(lst.get(0)),
-						Integer.parseInt(lst.get(1)));
-			} else if (tp.equals("NEWDESC")) {
-				List<String> lst = Bytes.splitStr(null, rest);
-				handler.newDescriptors(lst);
-			} else if (tp.equals("DEBUG") ||
-					tp.equals("INFO") ||
-					tp.equals("NOTICE") ||
-					tp.equals("WARN") ||
-					tp.equals("ERR")) {
-				handler.message(tp, rest);
-			} else {
-				handler.unrecognized(tp, rest);
-			}
-		}
-	}
-
-
-	/**
-	 * Sets <b>w</b> as the PrintWriter for debugging output,
-	 * which writes out all messages passed between Tor and the controller.
-	 * Outgoing messages are preceded by "\>\>" and incoming messages are preceded
-	 * by "\<\<"
-	 */
-	public void setDebugging(PrintWriter w) {
-		debugOutput = w;
-	}
-
-	/**
-	 * Sets <b>s</b> as the PrintStream for debugging output,
-	 * which writes out all messages passed between Tor and the controller.
-	 * Outgoing messages are preceded by "\>\>" and incoming messages are preceded
-	 * by "\<\<"
-	 */
-	public void setDebugging(PrintStream s) {
-		debugOutput = new PrintWriter(s, true);
-	}
-
-	/**
-	 * Set the EventHandler object that will be notified of any
-	 * events Tor delivers to this connection.  To make Tor send us
-	 * events, call setEvents().
-	 */
-	public void setEventHandler(EventHandler handler) {
-		this.handler = handler;
-	}
-
-	/**
-	 * Start a thread to react to Tor's responses in the background.
-	 * This is necessary to handle asynchronous events and synchronous
-	 * responses that arrive independantly over the same socket.
-	 */
-	public Thread launchThread(boolean daemon) {
-		LOG.info("Entering synchronized (connection)");
-		synchronized (this) {
-			LOG.info("Entered synchronized (connection)");
-			ControlParseThread th = new ControlParseThread();
-			LOG.info("Launching parse thread " + th.hashCode());
-			if (daemon)
-				th.setDaemon(true);
-			th.start();
-			this.thread = th;
-			LOG.info("Leaving synchronized (connection)");
-			return th;
-		}
-	}
-
-	protected class ControlParseThread extends Thread {
-
-		@Override
-		public void run() {
-			try {
-				react();
-			} catch (IOException ex) {
-				LOG.info("Parse thread " + hashCode()
-						+ " caught exception " + ex);
-				parseThreadException = ex;
-			}
-		}
-	}
-
-	protected void checkThread() {
-		LOG.info("Entering synchronized (connection)");
-		synchronized (this) {
-			LOG.info("Entered synchronized (connection)");
-			if (thread == null)
-				launchThread(true);
-			LOG.info("Leaving synchronized (connection)");
-		}
-	}
-
-	/**
-	 * helper: implement the main background loop.
-	 */
-	protected void react() throws IOException {
-		while (true) {
-			ArrayList<ReplyLine> lst = readReply();
-			LOG.info("Read reply: " + lst);
-			if (lst.isEmpty()) {
-				// interrupted queued waiters, there won't be any response.
-				LOG.info("Entering synchronized (waiters)");
-				synchronized (waiters) {
-					LOG.info("Entered synchronized (waiters)");
-					if (!waiters.isEmpty()) {
-						for (Waiter w : waiters) {
-							LOG.info("Interrupting waiter " + w.hashCode());
-							w.interrupt();
-						}
-					} else {
-						LOG.info("No waiters");
-					}
-					LOG.info("Leaving synchronized (waiters)");
-				}
-				throw new IOException("Tor is no longer running");
-			}
-			if ((lst.get(0)).status.startsWith("6")) {
-				LOG.info("Reply is an event");
-				handleEvent(lst);
-			} else {
-				LOG.info("Entering synchronized (waiters)");
-				synchronized (waiters) {
-					LOG.info("Entered synchronized (waiters)");
-					if (!waiters.isEmpty()) {
-						Waiter w;
-						w = waiters.removeFirst();
-						LOG.info("Setting response for waiter " + w.hashCode());
-						w.setResponse(lst);
-					} else {
-						LOG.info("No waiters");
-					}
-					LOG.info("Leaving synchronized (waiters)");
-				}
-
-			}
-		}
-	}
-
-	/**
-	 * Change the value of the configuration option 'key' to 'val'.
-	 */
-	public void setConf(String key, String value) throws IOException {
-		List<String> lst = new ArrayList<>();
-		lst.add(key + " " + value);
-		setConf(lst);
-	}
-
-	/**
-	 * Change the values of the configuration options stored in kvMap.
-	 */
-	public void setConf(Map<String, String> kvMap) throws IOException {
-		List<String> lst = new ArrayList<>();
-		for (Iterator<Map.Entry<String, String>> it =
-				kvMap.entrySet().iterator(); it.hasNext(); ) {
-			Map.Entry<String, String> ent = it.next();
-			lst.add(ent.getKey() + " " + ent.getValue() + "\n");
-		}
-		setConf(lst);
-	}
-
-	/**
-	 * Changes the values of the configuration options stored in
-	 * <b>kvList</b>.  Each list element in <b>kvList</b> is expected to be
-	 * String of the format "key value".
-	 * <p>
-	 * Tor behaves as though it had just read each of the key-value pairs
-	 * from its configuration file.  Keywords with no corresponding values have
-	 * their configuration values reset to their defaults.  setConf is
-	 * all-or-nothing: if there is an error in any of the configuration settings,
-	 * Tor sets none of them.
-	 * <p>
-	 * When a configuration option takes multiple values, or when multiple
-	 * configuration keys form a context-sensitive group (see getConf below), then
-	 * setting any of the options in a setConf command is taken to reset all of
-	 * the others.  For example, if two ORBindAddress values are configured, and a
-	 * command arrives containing a single ORBindAddress value, the new
-	 * command's value replaces the two old values.
-	 * <p>
-	 * To remove all settings for a given option entirely (and go back to its
-	 * default value), include a String in <b>kvList</b> containing the key and no value.
-	 */
-	public void setConf(Collection<String> kvList) throws IOException {
-		if (kvList.size() == 0)
-			return;
-		StringBuffer b = new StringBuffer("SETCONF");
-		for (Iterator<String> it = kvList.iterator(); it.hasNext(); ) {
-			String kv = it.next();
-			int i = kv.indexOf(' ');
-			if (i == -1)
-				b.append(" ").append(kv);
-			b.append(" ").append(kv.substring(0, i)).append("=")
-					.append(quote(kv.substring(i + 1)));
-		}
-		b.append("\r\n");
-		sendAndWaitForResponse(b.toString(), null);
-	}
-
-	/**
-	 * Try to reset the values listed in the collection 'keys' to their
-	 * default values.
-	 **/
-	public void resetConf(Collection<String> keys) throws IOException {
-		if (keys.size() == 0)
-			return;
-		StringBuffer b = new StringBuffer("RESETCONF");
-		for (Iterator<String> it = keys.iterator(); it.hasNext(); ) {
-			String key = it.next();
-			b.append(" ").append(key);
-		}
-		b.append("\r\n");
-		sendAndWaitForResponse(b.toString(), null);
-	}
-
-	/**
-	 * Return the value of the configuration option 'key'
-	 */
-	public List<ConfigEntry> getConf(String key) throws IOException {
-		List<String> lst = new ArrayList<>();
-		lst.add(key);
-		return getConf(lst);
-	}
-
-	/**
-	 * Requests the values of the configuration variables listed in <b>keys</b>.
-	 * Results are returned as a list of ConfigEntry objects.
-	 * <p>
-	 * If an option appears multiple times in the configuration, all of its
-	 * key-value pairs are returned in order.
-	 * <p>
-	 * Some options are context-sensitive, and depend on other options with
-	 * different keywords.  These cannot be fetched directly.  Currently there
-	 * is only one such option: clients should use the "HiddenServiceOptions"
-	 * virtual keyword to get all HiddenServiceDir, HiddenServicePort,
-	 * HiddenServiceNodes, and HiddenServiceExcludeNodes option settings.
-	 */
-	public List<ConfigEntry> getConf(Collection<String> keys)
-			throws IOException {
-		StringBuffer sb = new StringBuffer("GETCONF");
-		for (Iterator<String> it = keys.iterator(); it.hasNext(); ) {
-			String key = it.next();
-			sb.append(" ").append(key);
-		}
-		sb.append("\r\n");
-		List<ReplyLine> lst = sendAndWaitForResponse(sb.toString(), null);
-		List<ConfigEntry> result = new ArrayList<>();
-		for (Iterator<ReplyLine> it = lst.iterator(); it.hasNext(); ) {
-			String kv = (it.next()).msg;
-			int idx = kv.indexOf('=');
-			if (idx >= 0)
-				result.add(new ConfigEntry(kv.substring(0, idx),
-						kv.substring(idx + 1)));
-			else
-				result.add(new ConfigEntry(kv));
-		}
-		return result;
-	}
-
-	/**
-	 * Request that the server inform the client about interesting events.
-	 * Each element of <b>events</b> is one of the following Strings:
-	 * ["CIRC" | "STREAM" | "ORCONN" | "BW" | "DEBUG" |
-	 * "INFO" | "NOTICE" | "WARN" | "ERR" | "NEWDESC" | "ADDRMAP"] .
-	 * <p>
-	 * Any events not listed in the <b>events</b> are turned off; thus, calling
-	 * setEvents with an empty <b>events</b> argument turns off all event reporting.
-	 */
-	public void setEvents(List<String> events) throws IOException {
-		StringBuffer sb = new StringBuffer("SETEVENTS");
-		for (Iterator<String> it = events.iterator(); it.hasNext(); ) {
-			sb.append(" ").append(it.next());
-		}
-		sb.append("\r\n");
-		sendAndWaitForResponse(sb.toString(), null);
-	}
-
-	/**
-	 * Authenticates the controller to the Tor server.
-	 * <p>
-	 * By default, the current Tor implementation trusts all local users, and
-	 * the controller can authenticate itself by calling authenticate(new byte[0]).
-	 * <p>
-	 * If the 'CookieAuthentication' option is true, Tor writes a "magic cookie"
-	 * file named "control_auth_cookie" into its data directory.  To authenticate,
-	 * the controller must send the contents of this file in <b>auth</b>.
-	 * <p>
-	 * If the 'HashedControlPassword' option is set, <b>auth</b> must contain the salted
-	 * hash of a secret password.  The salted hash is computed according to the
-	 * S2K algorithm in RFC 2440 (OpenPGP), and prefixed with the s2k specifier.
-	 * This is then encoded in hexadecimal, prefixed by the indicator sequence
-	 * "16:".
-	 * <p>
-	 * You can generate the salt of a password by calling
-	 * 'tor --hash-password <password>'
-	 * or by using the provided PasswordDigest class.
-	 * To authenticate under this scheme, the controller sends Tor the original
-	 * secret that was used to generate the password.
-	 */
-	public void authenticate(byte[] auth) throws IOException {
-		String cmd = "AUTHENTICATE " + Bytes.hex(auth) + "\r\n";
-		sendAndWaitForResponse(cmd, null);
-	}
-
-	/**
-	 * Instructs the server to write out its configuration options into its torrc.
-	 */
-	public void saveConf() throws IOException {
-		sendAndWaitForResponse("SAVECONF\r\n", null);
-	}
-
-	/**
-	 * Sends a signal from the controller to the Tor server.
-	 * <b>signal</b> is one of the following Strings:
-	 * <ul>
-	 * <li>"RELOAD" or "HUP" :  Reload config items, refetch directory</li>
-	 * <li>"SHUTDOWN" or "INT" : Controlled shutdown: if server is an OP, exit immediately.
-	 * If it's an OR, close listeners and exit after 30 seconds</li>
-	 * <li>"DUMP" or "USR1" : Dump stats: log information about open connections and circuits</li>
-	 * <li>"DEBUG" or "USR2" : Debug: switch all open logs to loglevel debug</li>
-	 * <li>"HALT" or "TERM" : Immediate shutdown: clean up and exit now</li>
-	 * </ul>
-	 */
-	public void signal(String signal) throws IOException {
-		String cmd = "SIGNAL " + signal + "\r\n";
-		sendAndWaitForResponse(cmd, null);
-	}
-
-	/**
-	 * Send a signal to the Tor process to shut it down or halt it.
-	 * Does not wait for a response.
-	 */
-	public void shutdownTor(String signal) throws IOException {
-		String s = "SIGNAL " + signal + "\r\n";
-		Waiter w = new Waiter();
-		if (debugOutput != null)
-			debugOutput.print(">> " + s);
-		LOG.info("Entering synchronized (waiters)");
-		synchronized (waiters) {
-			LOG.info("Entered synchronized (waiters)");
-			output.write(s);
-			output.flush();
-			LOG.info("Leaving synchronized (waiters)");
-		}
-	}
-
-	/**
-	 * Tells the Tor server that future SOCKS requests for connections to a set of original
-	 * addresses should be replaced with connections to the specified replacement
-	 * addresses.  Each element of <b>kvLines</b> is a String of the form
-	 * "old-address new-address".  This function returns the new address mapping.
-	 * <p>
-	 * The client may decline to provide a body for the original address, and
-	 * instead send a special null address ("0.0.0.0" for IPv4, "::0" for IPv6, or
-	 * "." for hostname), signifying that the server should choose the original
-	 * address itself, and return that address in the reply.  The server
-	 * should ensure that it returns an element of address space that is unlikely
-	 * to be in actual use.  If there is already an address mapped to the
-	 * destination address, the server may reuse that mapping.
-	 * <p>
-	 * If the original address is already mapped to a different address, the old
-	 * mapping is removed.  If the original address and the destination address
-	 * are the same, the server removes any mapping in place for the original
-	 * address.
-	 * <p>
-	 * Mappings set by the controller last until the Tor process exits:
-	 * they never expire. If the controller wants the mapping to last only
-	 * a certain time, then it must explicitly un-map the address when that
-	 * time has elapsed.
-	 */
-	public Map<String, String> mapAddresses(Collection<String> kvLines)
-			throws IOException {
-		StringBuffer sb = new StringBuffer("MAPADDRESS");
-		for (Iterator<String> it = kvLines.iterator(); it.hasNext(); ) {
-			String kv = it.next();
-			int i = kv.indexOf(' ');
-			sb.append(" ").append(kv.substring(0, i)).append("=")
-					.append(quote(kv.substring(i + 1)));
-		}
-		sb.append("\r\n");
-		List<ReplyLine> lst = sendAndWaitForResponse(sb.toString(), null);
-		Map<String, String> result = new HashMap<>();
-		for (Iterator<ReplyLine> it = lst.iterator(); it.hasNext(); ) {
-			String kv = (it.next()).msg;
-			int idx = kv.indexOf('=');
-			result.put(kv.substring(0, idx),
-					kv.substring(idx + 1));
-		}
-		return result;
-	}
-
-	public Map<String, String> mapAddresses(Map<String, String> addresses)
-			throws IOException {
-		List<String> kvList = new ArrayList<>();
-		for (Iterator<Map.Entry<String, String>> it =
-				addresses.entrySet().iterator(); it.hasNext(); ) {
-			Map.Entry<String, String> e = it.next();
-			kvList.add(e.getKey() + " " + e.getValue());
-		}
-		return mapAddresses(kvList);
-	}
-
-	public String mapAddress(String fromAddr, String toAddr)
-			throws IOException {
-		List<String> lst = new ArrayList<>();
-		lst.add(fromAddr + " " + toAddr + "\n");
-		Map<String, String> m = mapAddresses(lst);
-		return m.get(fromAddr);
-	}
-
-	/**
-	 * Queries the Tor server for keyed values that are not stored in the torrc
-	 * configuration file.  Returns a map of keys to values.
-	 * <p>
-	 * Recognized keys include:
-	 * <ul>
-	 * <li>"version" : The version of the server's software, including the name
-	 * of the software. (example: "Tor 0.0.9.4")</li>
-	 * <li>"desc/id/<OR identity>" or "desc/name/<OR nickname>" : the latest server
-	 * descriptor for a given OR, NUL-terminated.  If no such OR is known, the
-	 * corresponding value is an empty string.</li>
-	 * <li>"network-status" : a space-separated list of all known OR identities.
-	 * This is in the same format as the router-status line in directories;
-	 * see tor-spec.txt for details.</li>
-	 * <li>"addr-mappings/all"</li>
-	 * <li>"addr-mappings/config"</li>
-	 * <li>"addr-mappings/cache"</li>
-	 * <li>"addr-mappings/control" : a space-separated list of address mappings, each
-	 * in the form of "from-address=to-address".  The 'config' key
-	 * returns those address mappings set in the configuration; the 'cache'
-	 * key returns the mappings in the client-side DNS cache; the 'control'
-	 * key returns the mappings set via the control interface; the 'all'
-	 * target returns the mappings set through any mechanism.</li>
-	 * <li>"circuit-status" : A series of lines as for a circuit status event. Each line is of the form:
-	 * "CircuitID CircStatus Path"</li>
-	 * <li>"stream-status" : A series of lines as for a stream status event.  Each is of the form:
-	 * "StreamID StreamStatus CircID Target"</li>
-	 * <li>"orconn-status" : A series of lines as for an OR connection status event.  Each is of the
-	 * form: "ServerID ORStatus"</li>
-	 * </ul>
-	 */
-	public Map<String, String> getInfo(Collection<String> keys)
-			throws IOException {
-		StringBuffer sb = new StringBuffer("GETINFO");
-		for (Iterator<String> it = keys.iterator(); it.hasNext(); ) {
-			sb.append(" ").append(it.next());
-		}
-		sb.append("\r\n");
-		List<ReplyLine> lst = sendAndWaitForResponse(sb.toString(), null);
-		Map<String, String> m = new HashMap<>();
-		for (Iterator<ReplyLine> it = lst.iterator(); it.hasNext(); ) {
-			ReplyLine line = it.next();
-			int idx = line.msg.indexOf('=');
-			if (idx < 0)
-				break;
-			String k = line.msg.substring(0, idx);
-			String v;
-			if (line.rest != null) {
-				v = line.rest;
-			} else {
-				v = line.msg.substring(idx + 1);
-			}
-			m.put(k, v);
-		}
-		return m;
-	}
-
-
-	/**
-	 * Return the value of the information field 'key'
-	 */
-	public String getInfo(String key) throws IOException {
-		List<String> lst = new ArrayList<>();
-		lst.add(key);
-		Map<String, String> m = getInfo(lst);
-		return m.get(key);
-	}
-
-	/**
-	 * An extendCircuit request takes one of two forms: either the <b>circID</b> is zero, in
-	 * which case it is a request for the server to build a new circuit according
-	 * to the specified path, or the <b>circID</b> is nonzero, in which case it is a
-	 * request for the server to extend an existing circuit with that ID according
-	 * to the specified <b>path</b>.
-	 * <p>
-	 * If successful, returns the Circuit ID of the (maybe newly created) circuit.
-	 */
-	public String extendCircuit(String circID, String path) throws IOException {
-		List<ReplyLine> lst = sendAndWaitForResponse(
-				"EXTENDCIRCUIT " + circID + " " + path + "\r\n", null);
-		return (lst.get(0)).msg;
-	}
-
-	/**
-	 * Informs the Tor server that the stream specified by <b>streamID</b> should be
-	 * associated with the circuit specified by <b>circID</b>.
-	 * <p>
-	 * Each stream may be associated with
-	 * at most one circuit, and multiple streams may share the same circuit.
-	 * Streams can only be attached to completed circuits (that is, circuits that
-	 * have sent a circuit status "BUILT" event or are listed as built in a
-	 * getInfo circuit-status request).
-	 * <p>
-	 * If <b>circID</b> is 0, responsibility for attaching the given stream is
-	 * returned to Tor.
-	 * <p>
-	 * By default, Tor automatically attaches streams to
-	 * circuits itself, unless the configuration variable
-	 * "__LeaveStreamsUnattached" is set to "1".  Attempting to attach streams
-	 * via TC when "__LeaveStreamsUnattached" is false may cause a race between
-	 * Tor and the controller, as both attempt to attach streams to circuits.
-	 */
-	public void attachStream(String streamID, String circID)
-			throws IOException {
-		sendAndWaitForResponse(
-				"ATTACHSTREAM " + streamID + " " + circID + "\r\n", null);
-	}
-
-	/**
-	 * Tells Tor about the server descriptor in <b>desc</b>.
-	 * <p>
-	 * The descriptor, when parsed, must contain a number of well-specified
-	 * fields, including fields for its nickname and identity.
-	 */
-	// More documentation here on format of desc?
-	// No need for return value?  control-spec.txt says reply is merely "250 OK" on success...
-	public String postDescriptor(String desc) throws IOException {
-		List<ReplyLine> lst =
-				sendAndWaitForResponse("+POSTDESCRIPTOR\r\n", desc);
-		return (lst.get(0)).msg;
-	}
-
-	/**
-	 * Tells Tor to change the exit address of the stream identified by <b>streamID</b>
-	 * to <b>address</b>. No remapping is performed on the new provided address.
-	 * <p>
-	 * To be sure that the modified address will be used, this event must be sent
-	 * after a new stream event is received, and before attaching this stream to
-	 * a circuit.
-	 */
-	public void redirectStream(String streamID, String address)
-			throws IOException {
-		sendAndWaitForResponse(
-				"REDIRECTSTREAM " + streamID + " " + address + "\r\n",
-				null);
-	}
-
-	/**
-	 * Tells Tor to close the stream identified by <b>streamID</b>.
-	 * <b>reason</b> should be one of the Tor RELAY_END reasons given in tor-spec.txt, as a decimal:
-	 * <ul>
-	 * <li>1 -- REASON_MISC           (catch-all for unlisted reasons)</li>
-	 * <li>2 -- REASON_RESOLVEFAILED  (couldn't look up hostname)</li>
-	 * <li>3 -- REASON_CONNECTREFUSED (remote host refused connection)</li>
-	 * <li>4 -- REASON_EXITPOLICY     (OR refuses to connect to host or port)</li>
-	 * <li>5 -- REASON_DESTROY        (Circuit is being destroyed)</li>
-	 * <li>6 -- REASON_DONE           (Anonymized TCP connection was closed)</li>
-	 * <li>7 -- REASON_TIMEOUT        (Connection timed out, or OR timed out while connecting)</li>
-	 * <li>8 -- (unallocated)</li>
-	 * <li>9 -- REASON_HIBERNATING    (OR is temporarily hibernating)</li>
-	 * <li>10 -- REASON_INTERNAL       (Internal error at the OR)</li>
-	 * <li>11 -- REASON_RESOURCELIMIT  (OR has no resources to fulfill request)</li>
-	 * <li>12 -- REASON_CONNRESET      (Connection was unexpectedly reset)</li>
-	 * <li>13 -- REASON_TORPROTOCOL    (Sent when closing connection because of Tor protocol violations)</li>
-	 * </ul>
-	 * <p>
-	 * Tor may hold the stream open for a while to flush any data that is pending.
-	 */
-	public void closeStream(String streamID, byte reason)
-			throws IOException {
-		sendAndWaitForResponse(
-				"CLOSESTREAM " + streamID + " " + reason + "\r\n", null);
-	}
-
-	/**
-	 * Tells Tor to close the circuit identified by <b>circID</b>.
-	 * If <b>ifUnused</b> is true, do not close the circuit unless it is unused.
-	 */
-	public void closeCircuit(String circID, boolean ifUnused)
-			throws IOException {
-		sendAndWaitForResponse("CLOSECIRCUIT " + circID +
-				(ifUnused ? " IFUNUSED" : "") + "\r\n", null);
-	}
-
-	/**
-	 * Tells Tor to exit when this control connection is closed. This command
-	 * was added in Tor 0.2.2.28-beta.
-	 */
-	public void takeOwnership() throws IOException {
-		sendAndWaitForResponse("TAKEOWNERSHIP\r\n", null);
-	}
-
-	/**
-	 * Tells Tor to generate and set up a new onion service using the best
-	 * supported algorithm.
-	 * <p/>
-	 * ADD_ONION was added in Tor 0.2.7.1-alpha.
-	 */
-	public Map<String, String> addOnion(Map<Integer, String> portLines)
-			throws IOException {
-		return addOnion("NEW:BEST", portLines, null);
-	}
-
-	/**
-	 * Tells Tor to generate and set up a new onion service using the best
-	 * supported algorithm.
-	 * <p/>
-	 * ADD_ONION was added in Tor 0.2.7.1-alpha.
-	 */
-	public Map<String, String> addOnion(Map<Integer, String> portLines,
-			boolean ephemeral, boolean detach)
-			throws IOException {
-		return addOnion("NEW:BEST", portLines, ephemeral, detach);
-	}
-
-	/**
-	 * Tells Tor to set up an onion service using the provided private key.
-	 * <p/>
-	 * ADD_ONION was added in Tor 0.2.7.1-alpha.
-	 */
-	public Map<String, String> addOnion(String privKey,
-			Map<Integer, String> portLines)
-			throws IOException {
-		return addOnion(privKey, portLines, null);
-	}
-
-	/**
-	 * Tells Tor to set up an onion service using the provided private key.
-	 * <p/>
-	 * ADD_ONION was added in Tor 0.2.7.1-alpha.
-	 */
-	public Map<String, String> addOnion(String privKey,
-			Map<Integer, String> portLines,
-			boolean ephemeral, boolean detach)
-			throws IOException {
-		List<String> flags = new ArrayList<>();
-		if (ephemeral)
-			flags.add("DiscardPK");
-		if (detach)
-			flags.add("Detach");
-		return addOnion(privKey, portLines, flags);
-	}
-
-	/**
-	 * Tells Tor to set up an onion service.
-	 * <p/>
-	 * ADD_ONION was added in Tor 0.2.7.1-alpha.
-	 */
-	public Map<String, String> addOnion(String privKey,
-			Map<Integer, String> portLines,
-			List<String> flags)
-			throws IOException {
-		if (privKey.indexOf(':') < 0)
-			throw new IllegalArgumentException("Invalid privKey");
-		if (portLines == null || portLines.size() < 1)
-			throw new IllegalArgumentException(
-					"Must provide at least one port line");
-		StringBuilder b = new StringBuilder();
-		b.append("ADD_ONION ").append(privKey);
-		if (flags != null && flags.size() > 0) {
-			b.append(" Flags=");
-			String separator = "";
-			for (String flag : flags) {
-				b.append(separator).append(flag);
-				separator = ",";
-			}
-		}
-		for (Map.Entry<Integer, String> portLine : portLines.entrySet()) {
-			int virtPort = portLine.getKey();
-			String target = portLine.getValue();
-			b.append(" Port=").append(virtPort);
-			if (target != null && target.length() > 0)
-				b.append(",").append(target);
-		}
-		b.append("\r\n");
-		List<ReplyLine> lst = sendAndWaitForResponse(b.toString(), null);
-		Map<String, String> ret = new HashMap<>();
-		ret.put(HS_ADDRESS, (lst.get(0)).msg.split("=", 2)[1]);
-		if (lst.size() > 2)
-			ret.put(HS_PRIVKEY, (lst.get(1)).msg.split("=", 2)[1]);
-		return ret;
-	}
-
-	/**
-	 * Tells Tor to take down an onion service previously set up with
-	 * addOnion(). The hostname excludes the .onion extension.
-	 * <p/>
-	 * DEL_ONION was added in Tor 0.2.7.1-alpha.
-	 */
-	public void delOnion(String hostname) throws IOException {
-		sendAndWaitForResponse("DEL_ONION " + hostname + "\r\n", null);
-	}
-
-	/**
-	 * Tells Tor to forget any cached client state relating to the hidden
-	 * service with the given hostname (excluding the .onion extension).
-	 */
-	public void forgetHiddenService(String hostname) throws IOException {
-		sendAndWaitForResponse("HSFORGET " + hostname + "\r\n", null);
-	}
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/TorControlError.java

@@ -1,39 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-import java.io.IOException;
-
-/**
- * An exception raised when Tor tells us about an error.
- */
-public class TorControlError extends IOException {
-
-    static final long serialVersionUID = 3;
-
-    private final int errorType;
-
-    public TorControlError(int type, String s) {
-        super(s);
-        errorType = type;
-    }
-
-    public TorControlError(String s) {
-        this(-1, s);
-    }
-
-    public int getErrorType() {
-        return errorType;
-    }
-
-    public String getErrorMsg() {
-        try {
-            if (errorType == -1)
-                return null;
-            return TorControlCommands.ERROR_MSGS[errorType];
-        } catch (ArrayIndexOutOfBoundsException ex) {
-            return "Unrecongized error #"+errorType;
-        }
-    }
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/TorControlSyntaxError.java

@@ -1,16 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control;
-
-import java.io.IOException;
-
-/**
- * An exception raised when Tor behaves in an unexpected way.
- */
-public class TorControlSyntaxError extends IOException {
-
-    static final long serialVersionUID = 3;
-
-    public TorControlSyntaxError(String s) { super(s); }
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/examples/.cvsignore

@@ -1 +0,0 @@
-*.class

bramble-core/src/main/java/net/freehaven/tor/control/examples/DebuggingEventHandler.java

@@ -1,44 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control.examples;
-
-import java.io.PrintWriter;
-import java.util.Iterator;
-import net.freehaven.tor.control.EventHandler;
-
-public class DebuggingEventHandler implements EventHandler {
-
-    private final PrintWriter out;
-
-    public DebuggingEventHandler(PrintWriter p) {
-        out = p;
-    }
-
-    public void circuitStatus(String status, String circID, String path) {
-        out.println("Circuit "+circID+" is now "+status+" (path="+path+")");
-    }
-    public void streamStatus(String status, String streamID, String target) {
-        out.println("Stream "+streamID+" is now "+status+" (target="+target+")");
-    }
-    public void orConnStatus(String status, String orName) {
-        out.println("OR connection to "+orName+" is now "+status);
-    }
-    public void bandwidthUsed(long read, long written) {
-        out.println("Bandwidth usage: "+read+" bytes read; "+
-                    written+" bytes written.");
-    }
-    public void newDescriptors(java.util.List<String> orList) {
-        out.println("New descriptors for routers:");
-        for (Iterator<String> i = orList.iterator(); i.hasNext(); )
-            out.println("   "+i.next());
-    }
-    public void message(String type, String msg) {
-        out.println("["+type+"] "+msg.trim());
-    }
-
-    public void unrecognized(String type, String msg) {
-        out.println("unrecognized event ["+type+"] "+msg.trim());
-    }
-
-}
-

bramble-core/src/main/java/net/freehaven/tor/control/examples/Main.java

@@ -1,146 +0,0 @@
-// Copyright 2005 Nick Mathewson, Roger Dingledine
-// See LICENSE file for copying information
-package net.freehaven.tor.control.examples;
-
-import net.freehaven.tor.control.*;
-import java.io.EOFException;
-import java.io.IOException;
-import java.io.PrintWriter;
-import java.net.Socket;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Arrays;
-import java.util.Map;
-import java.util.Iterator;
-
-public class Main implements TorControlCommands {
-
-    public static void main(String args[]) {
-        if (args.length < 1) {
-            System.err.println("No command given.");
-            return;
-        }
-        try {
-            if (args[0].equals("set-config")) {
-                setConfig(args);
-            } else if (args[0].equals("get-config")) {
-                getConfig(args);
-            } else if (args[0].equals("get-info")) {
-                getInfo(args);
-            } else if (args[0].equals("listen")) {
-                listenForEvents(args);
-            } else if (args[0].equals("signal")) {
-                signal(args);
-            } else if (args[0].equals("auth")) {
-                authDemo(args);
-            } else {
-                System.err.println("Unrecognized command: "+args[0]);
-            }
-        } catch (EOFException ex) {
-            System.out.println("Control socket closed by Tor.");
-        } catch (TorControlError ex) {
-            System.err.println("Error from Tor process: "+
-                               ex+" ["+ex.getErrorMsg()+"]");
-        } catch (IOException ex) {
-            System.err.println("IO exception when talking to Tor process: "+
-                               ex);
-            ex.printStackTrace(System.err);
-        }
-    }
-
-    private static TorControlConnection getConnection(String[] args,
-        boolean daemon) throws IOException {
-        Socket s = new Socket("127.0.0.1", 9100);
-        TorControlConnection conn = new TorControlConnection(s);
-        conn.launchThread(daemon);
-        conn.authenticate(new byte[0]);
-        return conn;
-    }
-
-    private static TorControlConnection getConnection(String[] args)
-        throws IOException {
-        return getConnection(args, true);
-    }
-
-    public static void setConfig(String[] args) throws IOException {
-        // Usage: "set-config [-save] key value key value key value"
-        TorControlConnection conn = getConnection(args);
-        ArrayList<String> lst = new ArrayList<String>();
-        int i = 1;
-        boolean save = false;
-        if (args[i].equals("-save")) {
-            save = true;
-            ++i;
-        }
-        for (; i < args.length; i +=2) {
-            lst.add(args[i]+" "+args[i+1]);
-        }
-        conn.setConf(lst);
-        if (save) {
-            conn.saveConf();
-        }
-    }
-
-    public static void getConfig(String[] args) throws IOException {
-        // Usage: get-config key key key
-        TorControlConnection conn = getConnection(args);
-        List<ConfigEntry> lst = conn.getConf(Arrays.asList(args).subList(1,args.length));
-        for (Iterator<ConfigEntry> i = lst.iterator(); i.hasNext(); ) {
-            ConfigEntry e = i.next();
-            System.out.println("KEY: "+e.key);
-            System.out.println("VAL: "+e.value);
-        }
-    }
-
-    public static void getInfo(String[] args) throws IOException {
-        TorControlConnection conn = getConnection(args);
-        Map<String,String> m = conn.getInfo(Arrays.asList(args).subList(1,args.length));
-        for (Iterator<Map.Entry<String, String>> i = m.entrySet().iterator(); i.hasNext(); ) {
-            Map.Entry<String,String> e = i.next();
-            System.out.println("KEY: "+e.getKey());
-            System.out.println("VAL: "+e.getValue());
-        }
-    }
-
-    public static void listenForEvents(String[] args) throws IOException {
-        // Usage: listen [circ|stream|orconn|bw|newdesc|info|notice|warn|error]*
-        TorControlConnection conn = getConnection(args, false);
-        ArrayList<String> lst = new ArrayList<String>();
-        for (int i = 1; i < args.length; ++i) {
-            lst.add(args[i]);
-        }
-        conn.setEventHandler(
-            new DebuggingEventHandler(new PrintWriter(System.out, true)));
-        conn.setEvents(lst);
-    }
-
-    public static void signal(String[] args) throws IOException {
-        // Usage signal [reload|shutdown|dump|debug|halt]
-        TorControlConnection conn = getConnection(args, false);
-        // distinguish shutdown signal from other signals
-        if ("SHUTDOWN".equalsIgnoreCase(args[1])
-        		|| "HALT".equalsIgnoreCase(args[1])) {
-        	conn.shutdownTor(args[1].toUpperCase());
-        } else {
-        	conn.signal(args[1].toUpperCase());
-        }
-    }
-
-    public static void authDemo(String[] args) throws IOException {
-
-        PasswordDigest pwd = PasswordDigest.generateDigest();
-        Socket s = new Socket("127.0.0.1", 9100);
-        TorControlConnection conn = new TorControlConnection(s);
-        conn.launchThread(true);
-        conn.authenticate(new byte[0]);
-
-        conn.setConf("HashedControlPassword", pwd.getHashedPassword());
-
-        s = new Socket("127.0.0.1", 9100);
-        conn = new TorControlConnection(s);
-        conn.launchThread(true);
-        conn.authenticate(pwd.getSecret());
-    }
-
-}
-

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

@@ -10,6 +10,7 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.GuardedBy;
 
 import static java.util.logging.Level.FINE;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.now;
 
 /**
@@ -42,7 +43,7 @@ public class PoliteExecutor implements Executor {
 			int maxConcurrentTasks) {
 		this.delegate = delegate;
 		this.maxConcurrentTasks = maxConcurrentTasks;
-		log = Logger.getLogger(tag);
+		log = getLogger(tag);
 	}
 
 	@Override

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

@@ -9,6 +9,7 @@ import java.util.concurrent.TimeUnit;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.FINE;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
@@ -22,7 +23,7 @@ public class TimeLoggingExecutor extends ThreadPoolExecutor {
 			RejectedExecutionHandler handler) {
 		super(corePoolSize, maxPoolSize, keepAliveTime, unit, workQueue,
 				handler);
-		log = Logger.getLogger(tag);
+		log = getLogger(tag);
 	}
 
 	@Override

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

@@ -6,9 +6,7 @@ import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.identity.LocalAuthor;
-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.util.IoUtils;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -19,19 +17,21 @@ 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;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.util.IoUtils.deleteFileOrDir;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.StringUtils.fromHexString;
 import static org.briarproject.bramble.util.StringUtils.toHexString;
 
-@MethodsNotNullByDefault
+@NotNullByDefault
-@ParametersNotNullByDefault
 class AccountManagerImpl implements AccountManager {
 
 	private static final Logger LOG =
-			Logger.getLogger(AccountManagerImpl.class.getName());
+			getLogger(AccountManagerImpl.class.getName());
 
 	private static final String DB_KEY_FILENAME = "db.key";
 	private static final String DB_KEY_BACKUP_FILENAME = "db.key.bak";
@@ -68,7 +68,7 @@ class AccountManagerImpl implements AccountManager {
 		return databaseKey;
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	@Nullable
 	protected String loadEncryptedDatabaseKey() {
 		String key = readDbKeyFromFile(dbKeyFile);
@@ -83,7 +83,7 @@ class AccountManagerImpl implements AccountManager {
 		return key;
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	@Nullable
 	private String readDbKeyFromFile(File f) {
 		if (!f.exists()) {
@@ -102,8 +102,8 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
-	protected boolean storeEncryptedDatabaseKey(String hex) {
+	boolean storeEncryptedDatabaseKey(String hex) {
 		LOG.info("Storing database key in file");
 		// Create the directory if necessary
 		if (databaseConfig.getDatabaseKeyDirectory().mkdirs())
@@ -140,7 +140,7 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	private void writeDbKeyToFile(String key, File f) throws IOException {
 		FileOutputStream out = new FileOutputStream(f);
 		out.write(key.getBytes("UTF-8"));
@@ -170,7 +170,7 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	private boolean encryptAndStoreDatabaseKey(SecretKey key, String password) {
 		byte[] plaintext = key.getBytes();
 		byte[] ciphertext = crypto.encryptWithPassword(plaintext, password);
@@ -181,8 +181,8 @@ class AccountManagerImpl implements AccountManager {
 	public void deleteAccount() {
 		synchronized (stateChangeLock) {
 			LOG.info("Deleting account");
-			IoUtils.deleteFileOrDir(databaseConfig.getDatabaseKeyDirectory());
+			deleteFileOrDir(databaseConfig.getDatabaseKeyDirectory());
-			IoUtils.deleteFileOrDir(databaseConfig.getDatabaseDirectory());
+			deleteFileOrDir(databaseConfig.getDatabaseDirectory());
 			databaseKey = null;
 		}
 	}
@@ -197,7 +197,7 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
-	// Locking: stateChangeLock
+	@GuardedBy("stateChangeLock")
 	@Nullable
 	private SecretKey loadAndDecryptDatabaseKey(String password) {
 		String hex = loadEncryptedDatabaseKey();

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

@@ -2,11 +2,10 @@ package org.briarproject.bramble.contact;
 
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.client.ClientHelper;
+import org.briarproject.bramble.api.contact.ContactExchangeListener;
 import org.briarproject.bramble.api.contact.ContactExchangeTask;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.ContactManager;
-import org.briarproject.bramble.api.contact.event.ContactExchangeFailedEvent;
-import org.briarproject.bramble.api.contact.event.ContactExchangeSucceededEvent;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.data.BdfDictionary;
@@ -14,7 +13,6 @@ import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.db.ContactExistsException;
 import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -45,6 +43,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.contact.RecordTypes.CONTACT_INFO;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_SIGNATURE_LENGTH;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -56,7 +55,7 @@ import static org.briarproject.bramble.util.ValidationUtils.checkSize;
 class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 
 	private static final Logger LOG =
-			Logger.getLogger(ContactExchangeTaskImpl.class.getName());
+			getLogger(ContactExchangeTaskImpl.class.getName());
 
 	private static final String SIGNING_LABEL_EXCHANGE =
 			"org.briarproject.briar.contact/EXCHANGE";
@@ -65,7 +64,6 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 	private final ClientHelper clientHelper;
 	private final RecordReaderFactory recordReaderFactory;
 	private final RecordWriterFactory recordWriterFactory;
-	private final EventBus eventBus;
 	private final Clock clock;
 	private final ConnectionManager connectionManager;
 	private final ContactManager contactManager;
@@ -74,6 +72,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 	private final StreamReaderFactory streamReaderFactory;
 	private final StreamWriterFactory streamWriterFactory;
 
+	private volatile ContactExchangeListener listener;
 	private volatile LocalAuthor localAuthor;
 	private volatile DuplexTransportConnection conn;
 	private volatile TransportId transportId;
@@ -83,9 +82,8 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 	@Inject
 	ContactExchangeTaskImpl(DatabaseComponent db, ClientHelper clientHelper,
 			RecordReaderFactory recordReaderFactory,
-			RecordWriterFactory recordWriterFactory, EventBus eventBus,
+			RecordWriterFactory recordWriterFactory, Clock clock,
-			Clock clock, ConnectionManager connectionManager,
+			ConnectionManager connectionManager, ContactManager contactManager,
-			ContactManager contactManager,
 			TransportPropertyManager transportPropertyManager,
 			CryptoComponent crypto, StreamReaderFactory streamReaderFactory,
 			StreamWriterFactory streamWriterFactory) {
@@ -93,7 +91,6 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 		this.clientHelper = clientHelper;
 		this.recordReaderFactory = recordReaderFactory;
 		this.recordWriterFactory = recordWriterFactory;
-		this.eventBus = eventBus;
 		this.clock = clock;
 		this.connectionManager = connectionManager;
 		this.contactManager = contactManager;
@@ -104,9 +101,11 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 	}
 
 	@Override
-	public void startExchange(LocalAuthor localAuthor, SecretKey masterSecret,
+	public void startExchange(ContactExchangeListener listener,
+			LocalAuthor localAuthor, SecretKey masterSecret,
 			DuplexTransportConnection conn, TransportId transportId,
 			boolean alice) {
+		this.listener = listener;
 		this.localAuthor = localAuthor;
 		this.conn = conn;
 		this.transportId = transportId;
@@ -125,8 +124,8 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			out = conn.getWriter().getOutputStream();
 		} catch (IOException e) {
 			logException(LOG, WARNING, e);
+			listener.contactExchangeFailed();
 			tryToClose(conn);
-			eventBus.broadcast(new ContactExchangeFailedEvent());
 			return;
 		}
 
@@ -136,7 +135,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			localProperties = transportPropertyManager.getLocalProperties();
 		} catch (DbException e) {
 			logException(LOG, WARNING, e);
-			eventBus.broadcast(new ContactExchangeFailedEvent());
+			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
 		}
@@ -192,13 +191,14 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			streamWriter.sendEndOfStream();
 			// Skip any remaining records from the incoming stream
 			try {
+				//noinspection InfiniteLoopStatement
 				while (true) recordReader.readRecord();
 			} catch (EOFException expected) {
 				LOG.info("End of stream");
 			}
 		} catch (IOException e) {
 			logException(LOG, WARNING, e);
-			eventBus.broadcast(new ContactExchangeFailedEvent());
+			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
 		}
@@ -206,7 +206,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 		// Verify the contact's signature
 		if (!verify(remoteInfo.author, remoteNonce, remoteInfo.signature)) {
 			LOG.warning("Invalid signature");
-			eventBus.broadcast(new ContactExchangeFailedEvent());
+			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
 		}
@@ -223,17 +223,15 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 					conn);
 			// Pseudonym exchange succeeded
 			LOG.info("Pseudonym exchange succeeded");
-			eventBus.broadcast(
+			listener.contactExchangeSucceeded(remoteInfo.author);
-					new ContactExchangeSucceededEvent(remoteInfo.author));
 		} catch (ContactExistsException e) {
 			logException(LOG, WARNING, e);
 			tryToClose(conn);
-			eventBus.broadcast(
+			listener.duplicateContact(remoteInfo.author);
-					new ContactExchangeFailedEvent(remoteInfo.author));
 		} catch (DbException e) {
 			logException(LOG, WARNING, e);
 			tryToClose(conn);
-			eventBus.broadcast(new ContactExchangeFailedEvent());
+			listener.contactExchangeFailed();
 		}
 	}
 

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

@@ -2,18 +2,20 @@ package org.briarproject.bramble.crypto;
 
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.StringUtils;
+
+import static org.briarproject.bramble.util.StringUtils.fromHexString;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
 
 @NotNullByDefault
 class AsciiArmour {
 
 	static String wrap(byte[] b, int lineLength) {
-		String wrapped = StringUtils.toHexString(b);
+		String wrapped = toHexString(b);
 		StringBuilder s = new StringBuilder();
 		int length = wrapped.length();
 		for (int i = 0; i < length; i += lineLength) {
 			int end = Math.min(i + lineLength, length);
-			s.append(wrapped.substring(i, end));
+			s.append(wrapped, i, end);
 			s.append("\r\n");
 		}
 		return s.toString();
@@ -21,7 +23,7 @@ class AsciiArmour {
 
 	static byte[] unwrap(String s) throws FormatException {
 		try {
-			return StringUtils.fromHexString(s.replaceAll("[^0-9a-fA-F]", ""));
+			return fromHexString(s.replaceAll("[^0-9a-fA-F]", ""));
 		} catch (IllegalArgumentException e) {
 			throw new FormatException();
 		}

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

@@ -12,8 +12,6 @@ import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.system.SecureRandomProvider;
-import org.briarproject.bramble.util.ByteUtils;
-import org.briarproject.bramble.util.StringUtils;
 import org.spongycastle.crypto.CryptoException;
 import org.spongycastle.crypto.Digest;
 import org.spongycastle.crypto.digests.Blake2bDigest;
@@ -30,16 +28,21 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import static java.lang.System.arraycopy;
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.readUint32;
+import static org.briarproject.bramble.util.ByteUtils.writeUint32;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.now;
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
 
 @NotNullByDefault
 class CryptoComponentImpl implements CryptoComponent {
 
 	private static final Logger LOG =
-			Logger.getLogger(CryptoComponentImpl.class.getName());
+			getLogger(CryptoComponentImpl.class.getName());
 
 	private static final int SIGNATURE_KEY_PAIR_BITS = 256;
 	private static final int STORAGE_IV_BYTES = 24; // 196 bits
@@ -188,7 +191,7 @@ class CryptoComponentImpl implements CryptoComponent {
 		PrivateKey ourPriv = ourKeyPair.getPrivate();
 		byte[][] hashInputs = new byte[inputs.length + 1][];
 		hashInputs[0] = performRawKeyAgreement(ourPriv, theirPublicKey);
-		System.arraycopy(inputs, 0, hashInputs, 1, inputs.length);
+		arraycopy(inputs, 0, hashInputs, 1, inputs.length);
 		byte[] hash = hash(label, hashInputs);
 		if (hash.length != SecretKey.LENGTH) throw new IllegalStateException();
 		return new SecretKey(hash);
@@ -216,26 +219,26 @@ class CryptoComponentImpl implements CryptoComponent {
 
 	private void updateSignature(Signature signature, String label,
 			byte[] toSign) throws GeneralSecurityException {
-		byte[] labelBytes = StringUtils.toUtf8(label);
+		byte[] labelBytes = toUtf8(label);
 		byte[] length = new byte[INT_32_BYTES];
-		ByteUtils.writeUint32(labelBytes.length, length, 0);
+		writeUint32(labelBytes.length, length, 0);
 		signature.update(length);
 		signature.update(labelBytes);
-		ByteUtils.writeUint32(toSign.length, length, 0);
+		writeUint32(toSign.length, length, 0);
 		signature.update(length);
 		signature.update(toSign);
 	}
 
 	@Override
 	public byte[] hash(String label, byte[]... inputs) {
-		byte[] labelBytes = StringUtils.toUtf8(label);
+		byte[] labelBytes = toUtf8(label);
 		Digest digest = new Blake2bDigest(256);
 		byte[] length = new byte[INT_32_BYTES];
-		ByteUtils.writeUint32(labelBytes.length, length, 0);
+		writeUint32(labelBytes.length, length, 0);
 		digest.update(length, 0, length.length);
 		digest.update(labelBytes, 0, labelBytes.length);
 		for (byte[] input : inputs) {
-			ByteUtils.writeUint32(input.length, length, 0);
+			writeUint32(input.length, length, 0);
 			digest.update(length, 0, length.length);
 			digest.update(input, 0, input.length);
 		}
@@ -246,14 +249,14 @@ class CryptoComponentImpl implements CryptoComponent {
 
 	@Override
 	public byte[] mac(String label, SecretKey macKey, byte[]... inputs) {
-		byte[] labelBytes = StringUtils.toUtf8(label);
+		byte[] labelBytes = toUtf8(label);
 		Digest mac = new Blake2bDigest(macKey.getBytes(), 32, null, null);
 		byte[] length = new byte[INT_32_BYTES];
-		ByteUtils.writeUint32(labelBytes.length, length, 0);
+		writeUint32(labelBytes.length, length, 0);
 		mac.update(length, 0, length.length);
 		mac.update(labelBytes, 0, labelBytes.length);
 		for (byte[] input : inputs) {
-			ByteUtils.writeUint32(input.length, length, 0);
+			writeUint32(input.length, length, 0);
 			mac.update(length, 0, length.length);
 			mac.update(input, 0, input.length);
 		}
@@ -297,13 +300,13 @@ class CryptoComponentImpl implements CryptoComponent {
 		output[outputOff] = PBKDF_FORMAT_SCRYPT;
 		outputOff++;
 		// Salt
-		System.arraycopy(salt, 0, output, outputOff, salt.length);
+		arraycopy(salt, 0, output, outputOff, salt.length);
 		outputOff += salt.length;
 		// Cost parameter
-		ByteUtils.writeUint32(cost, output, outputOff);
+		writeUint32(cost, output, outputOff);
 		outputOff += INT_32_BYTES;
 		// IV
-		System.arraycopy(iv, 0, output, outputOff, iv.length);
+		arraycopy(iv, 0, output, outputOff, iv.length);
 		outputOff += iv.length;
 		// Initialise the cipher and encrypt the plaintext
 		try {
@@ -333,16 +336,16 @@ class CryptoComponentImpl implements CryptoComponent {
 			return null; // Unknown format
 		// Salt
 		byte[] salt = new byte[PBKDF_SALT_BYTES];
-		System.arraycopy(input, inputOff, salt, 0, salt.length);
+		arraycopy(input, inputOff, salt, 0, salt.length);
 		inputOff += salt.length;
 		// Cost parameter
-		long cost = ByteUtils.readUint32(input, inputOff);
+		long cost = readUint32(input, inputOff);
 		inputOff += INT_32_BYTES;
 		if (cost < 2 || cost > Integer.MAX_VALUE)
 			return null; // Invalid cost parameter
 		// IV
 		byte[] iv = new byte[STORAGE_IV_BYTES];
-		System.arraycopy(input, inputOff, iv, 0, iv.length);
+		arraycopy(input, inputOff, iv, 0, iv.length);
 		inputOff += iv.length;
 		// Derive the key from the password
 		SecretKey key = passwordBasedKdf.deriveKey(password, salt, (int) cost);

bramble-core/src/main/java/org/briarproject/bramble/crypto/Curve25519KeyParser.java

@@ -7,6 +7,8 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.security.GeneralSecurityException;
 
+import static java.lang.System.arraycopy;
+
 @NotNullByDefault
 class Curve25519KeyParser implements KeyParser {
 
@@ -26,7 +28,7 @@ class Curve25519KeyParser implements KeyParser {
 
 	static byte[] clamp(byte[] b) {
 		byte[] clamped = new byte[32];
-		System.arraycopy(b, 0, clamped, 0, 32);
+		arraycopy(b, 0, clamped, 0, 32);
 		clamped[0] &= 248;
 		clamped[31] &= 127;
 		clamped[31] |= 64;

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

@@ -1,13 +1,15 @@
 package org.briarproject.bramble.crypto;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.ByteUtils;
 
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_HEADER_PLAINTEXT_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_NONCE_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYLOAD_LENGTH;
 import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.readUint16;
+import static org.briarproject.bramble.util.ByteUtils.writeUint16;
+import static org.briarproject.bramble.util.ByteUtils.writeUint64;
 
 @NotNullByDefault
 class FrameEncoder {
@@ -16,7 +18,7 @@ class FrameEncoder {
 		if (dest.length < FRAME_NONCE_LENGTH)
 			throw new IllegalArgumentException();
 		if (frameNumber < 0) throw new IllegalArgumentException();
-		ByteUtils.writeUint64(frameNumber, dest, 0);
+		writeUint64(frameNumber, dest, 0);
 		if (header) dest[0] |= 0x80;
 		for (int i = INT_64_BYTES; i < FRAME_NONCE_LENGTH; i++) dest[i] = 0;
 	}
@@ -29,8 +31,8 @@ class FrameEncoder {
 		if (paddingLength < 0) throw new IllegalArgumentException();
 		if (payloadLength + paddingLength > MAX_PAYLOAD_LENGTH)
 			throw new IllegalArgumentException();
-		ByteUtils.writeUint16(payloadLength, dest, 0);
+		writeUint16(payloadLength, dest, 0);
-		ByteUtils.writeUint16(paddingLength, dest, INT_16_BYTES);
+		writeUint16(paddingLength, dest, INT_16_BYTES);
 		if (finalFrame) dest[0] |= 0x80;
 	}
 
@@ -43,12 +45,12 @@ class FrameEncoder {
 	static int getPayloadLength(byte[] header) {
 		if (header.length < FRAME_HEADER_PLAINTEXT_LENGTH)
 			throw new IllegalArgumentException();
-		return ByteUtils.readUint16(header, 0) & 0x7FFF;
+		return readUint16(header, 0) & 0x7FFF;
 	}
 
 	static int getPaddingLength(byte[] header) {
 		if (header.length < FRAME_HEADER_PLAINTEXT_LENGTH)
 			throw new IllegalArgumentException();
-		return ByteUtils.readUint16(header, INT_16_BYTES);
+		return readUint16(header, INT_16_BYTES);
 	}
 }

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

@@ -8,6 +8,7 @@ import org.briarproject.bramble.api.crypto.SecretKey;
 
 import javax.inject.Inject;
 
+import static java.lang.System.arraycopy;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.COMMIT_LENGTH;
 
 class KeyAgreementCryptoImpl implements KeyAgreementCrypto {
@@ -24,7 +25,7 @@ class KeyAgreementCryptoImpl implements KeyAgreementCrypto {
 		byte[] hash = crypto.hash(COMMIT_LABEL, publicKey.getEncoded());
 		// The output is the first COMMIT_LENGTH bytes of the hash
 		byte[] commitment = new byte[COMMIT_LENGTH];
-		System.arraycopy(hash, 0, commitment, 0, COMMIT_LENGTH);
+		arraycopy(hash, 0, commitment, 0, COMMIT_LENGTH);
 		return commitment;
 	}
 

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

@@ -5,7 +5,6 @@ import org.briarproject.bramble.api.crypto.KeyParser;
 import org.briarproject.bramble.api.crypto.PrivateKey;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.StringUtils;
 import org.spongycastle.asn1.teletrust.TeleTrusTNamedCurves;
 import org.spongycastle.asn1.x9.X9ECParameters;
 import org.spongycastle.crypto.AsymmetricCipherKeyPair;
@@ -45,6 +44,9 @@ import java.util.Scanner;
 
 import javax.annotation.concurrent.Immutable;
 
+import static org.briarproject.bramble.util.StringUtils.fromHexString;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
+
 @Immutable
 @NotNullByDefault
 public class MessageEncrypter {
@@ -157,6 +159,7 @@ public class MessageEncrypter {
 			printUsage();
 			System.exit(1);
 		}
+		//noinspection IfCanBeSwitch
 		if (args[0].equals("generate")) {
 			if (args.length != 3) {
 				printUsage();
@@ -210,11 +213,11 @@ public class MessageEncrypter {
 		MessageEncrypter encrypter = new MessageEncrypter(random);
 		KeyPair keyPair = encrypter.generateKeyPair();
 		PrintStream out = new PrintStream(new FileOutputStream(publicKeyFile));
-		out.print(StringUtils.toHexString(keyPair.getPublic().getEncoded()));
+		out.print(toHexString(keyPair.getPublic().getEncoded()));
 		out.flush();
 		out.close();
 		out = new PrintStream(new FileOutputStream(privateKeyFile));
-		out.print(StringUtils.toHexString(keyPair.getPrivate().getEncoded()));
+		out.print(toHexString(keyPair.getPrivate().getEncoded()));
 		out.flush();
 		out.close();
 	}
@@ -223,7 +226,7 @@ public class MessageEncrypter {
 		SecureRandom random = new SecureRandom();
 		MessageEncrypter encrypter = new MessageEncrypter(random);
 		InputStream in = new FileInputStream(publicKeyFile);
-		byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
+		byte[] keyBytes = fromHexString(readFully(in).trim());
 		PublicKey publicKey =
 				encrypter.getKeyParser().parsePublicKey(keyBytes);
 		String message = readFully(System.in);
@@ -236,7 +239,7 @@ public class MessageEncrypter {
 		SecureRandom random = new SecureRandom();
 		MessageEncrypter encrypter = new MessageEncrypter(random);
 		InputStream in = new FileInputStream(privateKeyFile);
-		byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
+		byte[] keyBytes = fromHexString(readFully(in).trim());
 		PrivateKey privateKey =
 				encrypter.getKeyParser().parsePrivateKey(keyBytes);
 		byte[] ciphertext = AsciiArmour.unwrap(readFully(System.in));

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

@@ -2,7 +2,6 @@ package org.briarproject.bramble.crypto;
 
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.util.StringUtils;
 import org.spongycastle.crypto.generators.SCrypt;
 
 import java.util.logging.Logger;
@@ -10,13 +9,14 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.now;
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
 
 class ScryptKdf implements PasswordBasedKdf {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(ScryptKdf.class.getName());
-			Logger.getLogger(ScryptKdf.class.getName());
 
 	private static final int MIN_COST = 256; // Min parameter N
 	private static final int MAX_COST = 1024 * 1024; // Max parameter N
@@ -53,7 +53,7 @@ class ScryptKdf implements PasswordBasedKdf {
 	@Override
 	public SecretKey deriveKey(String password, byte[] salt, int cost) {
 		long start = now();
-		byte[] passwordBytes = StringUtils.toUtf8(password);
+		byte[] passwordBytes = toUtf8(password);
 		SecretKey k = new SecretKey(SCrypt.generate(passwordBytes, salt, cost,
 				BLOCK_SIZE, PARALLELIZATION, SecretKey.LENGTH));
 		logDuration(LOG, "Deriving key from password", start);

bramble-core/src/main/java/org/briarproject/bramble/crypto/Sec1KeyParser.java

@@ -16,6 +16,8 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
+import static java.lang.System.arraycopy;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.now;
 
@@ -28,8 +30,7 @@ import static org.briarproject.bramble.util.LogUtils.now;
 @NotNullByDefault
 class Sec1KeyParser implements KeyParser {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(Sec1KeyParser.class.getName());
-			Logger.getLogger(Sec1KeyParser.class.getName());
 
 	private final ECDomainParameters params;
 	private final BigInteger modulus;
@@ -56,12 +57,12 @@ class Sec1KeyParser implements KeyParser {
 		if (encodedKey[0] != 4) throw new GeneralSecurityException();
 		// The x co-ordinate must be >= 0 and < p
 		byte[] xBytes = new byte[bytesPerInt];
-		System.arraycopy(encodedKey, 1, xBytes, 0, bytesPerInt);
+		arraycopy(encodedKey, 1, xBytes, 0, bytesPerInt);
 		BigInteger x = new BigInteger(1, xBytes); // Positive signum
 		if (x.compareTo(modulus) >= 0) throw new GeneralSecurityException();
 		// The y co-ordinate must be >= 0 and < p
 		byte[] yBytes = new byte[bytesPerInt];
-		System.arraycopy(encodedKey, 1 + bytesPerInt, yBytes, 0, bytesPerInt);
+		arraycopy(encodedKey, 1 + bytesPerInt, yBytes, 0, bytesPerInt);
 		BigInteger y = new BigInteger(1, yBytes); // Positive signum
 		if (y.compareTo(modulus) >= 0) throw new GeneralSecurityException();
 		// Verify that y^2 == x^3 + ax + b (mod p)

bramble-core/src/main/java/org/briarproject/bramble/crypto/Sec1Utils.java

@@ -2,6 +2,8 @@ package org.briarproject.bramble.crypto;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import static java.lang.System.arraycopy;
+
 @NotNullByDefault
 class Sec1Utils {
 
@@ -10,10 +12,10 @@ class Sec1Utils {
 		if (src.length < destLen) {
 			int padding = destLen - src.length;
 			for (int i = destOff; i < destOff + padding; i++) dest[i] = 0;
-			System.arraycopy(src, 0, dest, destOff + padding, src.length);
+			arraycopy(src, 0, dest, destOff + padding, src.length);
 		} else {
 			int srcOff = src.length - destLen;
-			System.arraycopy(src, srcOff, dest, destOff, destLen);
+			arraycopy(src, srcOff, dest, destOff, destLen);
 		}
 	}
 }

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

@@ -4,7 +4,6 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.crypto.StreamDecrypter;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.ByteUtils;
 
 import java.io.EOFException;
 import java.io.IOException;
@@ -14,6 +13,7 @@ import java.security.GeneralSecurityException;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import static java.lang.System.arraycopy;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_HEADER_PLAINTEXT_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_NONCE_LENGTH;
@@ -26,6 +26,8 @@ import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_H
 import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_PLAINTEXT_LENGTH;
 import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.readUint16;
+import static org.briarproject.bramble.util.ByteUtils.readUint64;
 
 @NotThreadSafe
 @NotNullByDefault
@@ -130,7 +132,7 @@ class StreamDecrypterImpl implements StreamDecrypter {
 		}
 		// Extract the nonce
 		byte[] streamHeaderNonce = new byte[STREAM_HEADER_NONCE_LENGTH];
-		System.arraycopy(streamHeaderCiphertext, 0, streamHeaderNonce, 0,
+		arraycopy(streamHeaderCiphertext, 0, streamHeaderNonce, 0,
 				STREAM_HEADER_NONCE_LENGTH);
 		// Decrypt and authenticate the stream header
 		try {
@@ -145,17 +147,16 @@ class StreamDecrypterImpl implements StreamDecrypter {
 			throw new FormatException();
 		}
 		// Check the protocol version
-		int receivedProtocolVersion =
+		int receivedProtocolVersion = readUint16(streamHeaderPlaintext, 0);
-				ByteUtils.readUint16(streamHeaderPlaintext, 0);
 		if (receivedProtocolVersion != PROTOCOL_VERSION)
 			throw new FormatException();
 		// Check the stream number
-		long receivedStreamNumber = ByteUtils.readUint64(streamHeaderPlaintext,
+		long receivedStreamNumber = readUint64(streamHeaderPlaintext,
 				INT_16_BYTES);
 		if (receivedStreamNumber != streamNumber) throw new FormatException();
 		// Extract the frame key
 		byte[] frameKeyBytes = new byte[SecretKey.LENGTH];
-		System.arraycopy(streamHeaderPlaintext, INT_16_BYTES + INT_64_BYTES,
+		arraycopy(streamHeaderPlaintext, INT_16_BYTES + INT_64_BYTES,
 				frameKeyBytes, 0, SecretKey.LENGTH);
 		frameKey = new SecretKey(frameKeyBytes);
 	}

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

@@ -3,7 +3,6 @@ package org.briarproject.bramble.crypto;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.crypto.StreamEncrypter;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.ByteUtils;
 
 import java.io.IOException;
 import java.io.OutputStream;
@@ -12,6 +11,7 @@ import java.security.GeneralSecurityException;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import static java.lang.System.arraycopy;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_HEADER_PLAINTEXT_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_NONCE_LENGTH;
@@ -24,6 +24,8 @@ import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_H
 import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_PLAINTEXT_LENGTH;
 import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.writeUint16;
+import static org.briarproject.bramble.util.ByteUtils.writeUint64;
 
 @NotThreadSafe
 @NotNullByDefault
@@ -88,7 +90,7 @@ class StreamEncrypterImpl implements StreamEncrypter {
 			throw new RuntimeException(badCipher);
 		}
 		// Combine the payload and padding
-		System.arraycopy(payload, 0, framePlaintext, 0, payloadLength);
+		arraycopy(payload, 0, framePlaintext, 0, payloadLength);
 		for (int i = 0; i < paddingLength; i++)
 			framePlaintext[payloadLength + i] = 0;
 		// Encrypt and authenticate the payload and padding
@@ -118,13 +120,12 @@ class StreamEncrypterImpl implements StreamEncrypter {
 	private void writeStreamHeader() throws IOException {
 		// The header contains the protocol version, stream number and frame key
 		byte[] streamHeaderPlaintext = new byte[STREAM_HEADER_PLAINTEXT_LENGTH];
-		ByteUtils.writeUint16(PROTOCOL_VERSION, streamHeaderPlaintext, 0);
+		writeUint16(PROTOCOL_VERSION, streamHeaderPlaintext, 0);
-		ByteUtils.writeUint64(streamNumber, streamHeaderPlaintext,
+		writeUint64(streamNumber, streamHeaderPlaintext, INT_16_BYTES);
-				INT_16_BYTES);
+		arraycopy(frameKey.getBytes(), 0, streamHeaderPlaintext,
-		System.arraycopy(frameKey.getBytes(), 0, streamHeaderPlaintext,
 				INT_16_BYTES + INT_64_BYTES, SecretKey.LENGTH);
 		byte[] streamHeaderCiphertext = new byte[STREAM_HEADER_LENGTH];
-		System.arraycopy(streamHeaderNonce, 0, streamHeaderCiphertext, 0,
+		arraycopy(streamHeaderNonce, 0, streamHeaderCiphertext, 0,
 				STREAM_HEADER_NONCE_LENGTH);
 		// Encrypt and authenticate the stream header key
 		try {

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

@@ -7,13 +7,12 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.transport.IncomingKeys;
 import org.briarproject.bramble.api.transport.OutgoingKeys;
 import org.briarproject.bramble.api.transport.TransportKeys;
-import org.briarproject.bramble.util.ByteUtils;
-import org.briarproject.bramble.util.StringUtils;
 import org.spongycastle.crypto.Digest;
 import org.spongycastle.crypto.digests.Blake2bDigest;
 
 import javax.inject.Inject;
 
+import static java.lang.System.arraycopy;
 import static org.briarproject.bramble.api.transport.TransportConstants.ALICE_HEADER_LABEL;
 import static org.briarproject.bramble.api.transport.TransportConstants.ALICE_TAG_LABEL;
 import static org.briarproject.bramble.api.transport.TransportConstants.BOB_HEADER_LABEL;
@@ -24,6 +23,9 @@ import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.MAX_16_BIT_UNSIGNED;
 import static org.briarproject.bramble.util.ByteUtils.MAX_32_BIT_UNSIGNED;
+import static org.briarproject.bramble.util.ByteUtils.writeUint16;
+import static org.briarproject.bramble.util.ByteUtils.writeUint64;
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
 
 class TransportCryptoImpl implements TransportCrypto {
 
@@ -91,21 +93,21 @@ class TransportCryptoImpl implements TransportCrypto {
 
 	private SecretKey rotateKey(SecretKey k, long rotationPeriod) {
 		byte[] period = new byte[INT_64_BYTES];
-		ByteUtils.writeUint64(rotationPeriod, period, 0);
+		writeUint64(rotationPeriod, period, 0);
 		return crypto.deriveKey(ROTATE_LABEL, k, period);
 	}
 
 	private SecretKey deriveTagKey(SecretKey master, TransportId t,
 			boolean alice) {
 		String label = alice ? ALICE_TAG_LABEL : BOB_TAG_LABEL;
-		byte[] id = StringUtils.toUtf8(t.getString());
+		byte[] id = toUtf8(t.getString());
 		return crypto.deriveKey(label, master, id);
 	}
 
 	private SecretKey deriveHeaderKey(SecretKey master, TransportId t,
 			boolean alice) {
 		String label = alice ? ALICE_HEADER_LABEL : BOB_HEADER_LABEL;
-		byte[] id = StringUtils.toUtf8(t.getString());
+		byte[] id = toUtf8(t.getString());
 		return crypto.deriveKey(label, master, id);
 	}
 
@@ -125,14 +127,14 @@ class TransportCryptoImpl implements TransportCrypto {
 		// The input is the protocol version as a 16-bit integer, followed by
 		// the stream number as a 64-bit integer
 		byte[] protocolVersionBytes = new byte[INT_16_BYTES];
-		ByteUtils.writeUint16(protocolVersion, protocolVersionBytes, 0);
+		writeUint16(protocolVersion, protocolVersionBytes, 0);
 		prf.update(protocolVersionBytes, 0, protocolVersionBytes.length);
 		byte[] streamNumberBytes = new byte[INT_64_BYTES];
-		ByteUtils.writeUint64(streamNumber, streamNumberBytes, 0);
+		writeUint64(streamNumber, streamNumberBytes, 0);
 		prf.update(streamNumberBytes, 0, streamNumberBytes.length);
 		byte[] mac = new byte[macLength];
 		prf.doFinal(mac, 0);
 		// The output is the first TAG_LENGTH bytes of the MAC
-		System.arraycopy(mac, 0, tag, 0, TAG_LENGTH);
+		arraycopy(mac, 0, tag, 0, TAG_LENGTH);
 	}
 }

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

@@ -242,7 +242,7 @@ interface Database<T> {
 	 * bytes. This is based on the minimum of the space available on the device
 	 * where the database is stored and the database's configured size.
 	 */
-	long getFreeSpace() throws DbException;
+	long getFreeSpace();
 
 	/**
 	 * Returns the group with the given ID.

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

@@ -61,7 +61,6 @@ import org.briarproject.bramble.api.transport.TransportKeys;
 
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -72,7 +71,9 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+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.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
 import static org.briarproject.bramble.api.sync.validation.MessageState.DELIVERED;
@@ -87,7 +88,7 @@ import static org.briarproject.bramble.util.LogUtils.now;
 class DatabaseComponentImpl<T> implements DatabaseComponent {
 
 	private static final Logger LOG =
-			Logger.getLogger(DatabaseComponentImpl.class.getName());
+			getLogger(DatabaseComponentImpl.class.getName());
 
 	private final Database<T> db;
 	private final Class<T> txnClass;
@@ -898,7 +899,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		if (old == INVISIBLE) db.addGroupVisibility(txn, c, g, v == SHARED);
 		else if (v == INVISIBLE) db.removeGroupVisibility(txn, c, g);
 		else db.setGroupVisibility(txn, c, g, v == SHARED);
-		List<ContactId> affected = Collections.singletonList(c);
+		List<ContactId> affected = singletonList(c);
 		transaction.attach(new GroupVisibilityUpdatedEvent(affected));
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/db/H2Database.java

@@ -7,7 +7,6 @@ import org.briarproject.bramble.api.db.MigrationListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.util.StringUtils;
 
 import java.io.File;
 import java.sql.Connection;
@@ -23,6 +22,7 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.db.JdbcUtils.tryToClose;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
 
 /**
  * Contains all the H2-specific code for the database.
@@ -107,7 +107,7 @@ class H2Database extends JdbcDatabase {
 		Properties props = new Properties();
 		props.setProperty("user", "user");
 		// Separate the file password from the user password with a space
-		String hex = StringUtils.toHexString(key.getBytes());
+		String hex = toHexString(key.getBytes());
 		props.put("password", hex + " password");
 		return DriverManager.getConnection(getUrl(), props);
 	}

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

@@ -7,7 +7,6 @@ import org.briarproject.bramble.api.db.MigrationListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.util.StringUtils;
 
 import java.io.File;
 import java.sql.Connection;
@@ -22,6 +21,7 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.db.JdbcUtils.tryToClose;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
 
 /**
  * Contains all the HSQLDB-specific code for the database.
@@ -114,7 +114,7 @@ class HyperSqlDatabase extends JdbcDatabase {
 	protected Connection createConnection() throws SQLException {
 		SecretKey key = this.key;
 		if (key == null) throw new IllegalStateException();
-		String hex = StringUtils.toHexString(key.getBytes());
+		String hex = toHexString(key.getBytes());
 		return DriverManager.getConnection(url + ";crypt_key=" + hex);
 	}
 

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

@@ -38,9 +38,7 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
@@ -54,11 +52,17 @@ import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
+import javax.annotation.concurrent.GuardedBy;
 
+import static java.lang.System.arraycopy;
 import static java.sql.Types.INTEGER;
 import static java.sql.Types.VARCHAR;
+import static java.util.Arrays.asList;
+import static java.util.Collections.emptyMap;
+import static java.util.Collections.emptySet;
 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.db.Metadata.REMOVE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
@@ -309,19 +313,20 @@ abstract class JdbcDatabase implements Database<Connection> {
 			"CREATE INDEX IF NOT EXISTS statusesByContactIdTimestamp"
 					+ " ON statuses (contactId, timestamp)";
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(JdbcDatabase.class.getName());
-			Logger.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;
 
-	// Locking: connectionsLock
+	@GuardedBy("connectionsLock")
 	private final LinkedList<Connection> connections = new LinkedList<>();
 
-	private int openConnections = 0; // Locking: connectionsLock
+	@GuardedBy("connectionsLock")
-	private boolean closed = false; // Locking: connectionsLock
+	private int openConnections = 0;
+	@GuardedBy("connectionsLock")
+	private boolean closed = false;
 
 	protected abstract Connection createConnection() throws SQLException;
 
@@ -337,6 +342,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		this.clock = clock;
 	}
 
+	@SuppressWarnings("unused")
 	protected void open(String driverClass, boolean reopen, SecretKey key,
 			@Nullable MigrationListener listener) throws DbException {
 		// Load the JDBC driver
@@ -424,7 +430,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
 	List<Migration<Connection>> getMigrations() {
-		return Arrays.asList(
+		return asList(
 				new Migration38_39(),
 				new Migration39_40(),
 				new Migration40_41(dbTypes)
@@ -766,7 +772,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 			for (Entry<ContactId, Boolean> e : visibility.entrySet()) {
 				ContactId c = e.getKey();
 				boolean offered = removeOfferedMessage(txn, c, m.getId());
-				boolean seen = offered || (sender != null && c.equals(sender));
+				boolean seen = offered || c.equals(sender);
 				addStatus(txn, m.getId(), c, m.getGroupId(), m.getTimestamp(),
 						raw.length, state, e.getValue(), messageShared,
 						false, seen);
@@ -1536,7 +1542,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 			if (raw == null) throw new MessageDeletedException();
 			if (raw.length <= MESSAGE_HEADER_LENGTH) throw new AssertionError();
 			byte[] body = new byte[raw.length - MESSAGE_HEADER_LENGTH];
-			System.arraycopy(raw, MESSAGE_HEADER_LENGTH, body, 0, body.length);
+			arraycopy(raw, MESSAGE_HEADER_LENGTH, body, 0, body.length);
 			return new Message(m, g, timestamp, body);
 		} catch (SQLException e) {
 			tryToClose(rs, LOG, WARNING);
@@ -1596,7 +1602,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 				if (intersection == null) intersection = ids;
 				else intersection.retainAll(ids);
 				// Return early if there are no matches
-				if (intersection.isEmpty()) return Collections.emptySet();
+				if (intersection.isEmpty()) return emptySet();
 			}
 			if (intersection == null) throw new AssertionError();
 			return intersection;
@@ -1645,7 +1651,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 			GroupId g, Metadata query) throws DbException {
 		// Retrieve the matching message IDs
 		Collection<MessageId> matches = getMessageIds(txn, g, query);
-		if (matches.isEmpty()) return Collections.emptyMap();
+		if (matches.isEmpty()) return emptyMap();
 		// Retrieve the metadata for each match
 		Map<MessageId, Metadata> all = new HashMap<>(matches.size());
 		for (MessageId m : matches) all.put(m, getMessageMetadata(txn, m));
@@ -2395,7 +2401,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 				}
 				ps.close();
 			}
-			if (notRemoved.isEmpty()) return Collections.emptyMap();
+			if (notRemoved.isEmpty()) return emptyMap();
 			// Update any keys that already exist
 			String sql = "UPDATE " + tableName + " SET value = ?"
 					+ " WHERE " + columnName + " = ? AND metaKey = ?";

bramble-core/src/main/java/org/briarproject/bramble/db/Migration38_39.java

@@ -8,12 +8,12 @@ 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 Migration38_39 implements Migration<Connection> {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(Migration38_39.class.getName());
-			Logger.getLogger(Migration38_39.class.getName());
 
 	@Override
 	public int getStartVersion() {

bramble-core/src/main/java/org/briarproject/bramble/db/Migration39_40.java

@@ -8,12 +8,12 @@ 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 Migration39_40 implements Migration<Connection> {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(Migration39_40.class.getName());
-			Logger.getLogger(Migration39_40.class.getName());
 
 	@Override
 	public int getStartVersion() {

bramble-core/src/main/java/org/briarproject/bramble/db/Migration40_41.java

@@ -17,7 +17,7 @@ class Migration40_41 implements Migration<Connection> {
 
 	private final DatabaseTypes dbTypes;
 
-	public Migration40_41(DatabaseTypes databaseTypes) {
+	Migration40_41(DatabaseTypes databaseTypes) {
 		this.dbTypes = databaseTypes;
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/identity/AuthorFactoryImpl.java

@@ -7,8 +7,6 @@ import org.briarproject.bramble.api.identity.AuthorId;
 import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.util.ByteUtils;
-import org.briarproject.bramble.util.StringUtils;
 
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
@@ -16,6 +14,8 @@ import javax.inject.Inject;
 import static org.briarproject.bramble.api.identity.Author.FORMAT_VERSION;
 import static org.briarproject.bramble.api.identity.AuthorId.LABEL;
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.writeUint32;
+import static org.briarproject.bramble.util.StringUtils.toUtf8;
 
 @Immutable
 @NotNullByDefault
@@ -58,8 +58,8 @@ class AuthorFactoryImpl implements AuthorFactory {
 
 	private AuthorId getId(int formatVersion, String name, byte[] publicKey) {
 		byte[] formatVersionBytes = new byte[INT_32_BYTES];
-		ByteUtils.writeUint32(formatVersion, formatVersionBytes, 0);
+		writeUint32(formatVersion, formatVersionBytes, 0);
 		return new AuthorId(crypto.hash(LABEL, formatVersionBytes,
-				StringUtils.toUtf8(name), publicKey));
+				toUtf8(name), publicKey));
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/identity/IdentityManagerImpl.java

@@ -16,6 +16,7 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.now;
 
@@ -24,7 +25,7 @@ import static org.briarproject.bramble.util.LogUtils.now;
 class IdentityManagerImpl implements IdentityManager {
 
 	private static final Logger LOG =
-			Logger.getLogger(IdentityManagerImpl.class.getName());
+			getLogger(IdentityManagerImpl.class.getName());
 
 	private final DatabaseComponent db;
 	private final CryptoComponent crypto;

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/AbortException.java

@@ -2,7 +2,7 @@ package org.briarproject.bramble.keyagreement;
 
 class AbortException extends Exception {
 
-	boolean receivedAbort;
+	final boolean receivedAbort;
 
 	AbortException() {
 		this(false);

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/ConnectionChooserImpl.java

@@ -20,13 +20,14 @@ import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
 
 @NotNullByDefault
 @ThreadSafe
 class ConnectionChooserImpl implements ConnectionChooser {
 
 	private static final Logger LOG =
-			Logger.getLogger(ConnectionChooserImpl.class.getName());
+			getLogger(ConnectionChooserImpl.class.getName());
 
 	private final Clock clock;
 	private final Executor ioExecutor;

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementConnector.java

@@ -30,6 +30,7 @@ import javax.annotation.Nullable;
 
 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.CONNECTION_TIMEOUT;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
@@ -41,7 +42,7 @@ class KeyAgreementConnector {
 	}
 
 	private static final Logger LOG =
-			Logger.getLogger(KeyAgreementConnector.class.getName());
+			getLogger(KeyAgreementConnector.class.getName());
 
 	private final Callbacks callbacks;
 	private final KeyAgreementCrypto keyAgreementCrypto;

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementTaskImpl.java

@@ -28,6 +28,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
@@ -36,7 +37,7 @@ class KeyAgreementTaskImpl extends Thread implements KeyAgreementTask,
 		KeyAgreementProtocol.Callbacks, KeyAgreementConnector.Callbacks {
 
 	private static final Logger LOG =
-			Logger.getLogger(KeyAgreementTaskImpl.class.getName());
+			getLogger(KeyAgreementTaskImpl.class.getName());
 
 	private final CryptoComponent crypto;
 	private final KeyAgreementCrypto keyAgreementCrypto;

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementTransport.java

@@ -16,6 +16,7 @@ import java.io.OutputStream;
 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.keyagreement.KeyAgreementConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.ABORT;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.CONFIRM;
@@ -29,7 +30,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 class KeyAgreementTransport {
 
 	private static final Logger LOG =
-			Logger.getLogger(KeyAgreementTransport.class.getName());
+			getLogger(KeyAgreementTransport.class.getName());
 
 	private final KeyAgreementConnection kac;
 	private final RecordReader reader;

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

@@ -28,6 +28,7 @@ import javax.inject.Inject;
 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.lifecycle.LifecycleManager.LifecycleState.COMPACTING_DATABASE;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.MIGRATING_DATABASE;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.RUNNING;
@@ -49,7 +50,7 @@ import static org.briarproject.bramble.util.LogUtils.now;
 class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 
 	private static final Logger LOG =
-			Logger.getLogger(LifecycleManagerImpl.class.getName());
+			getLogger(LifecycleManagerImpl.class.getName());
 
 	private final DatabaseComponent db;
 	private final EventBus eventBus;

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

@@ -26,13 +26,14 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 class ConnectionManagerImpl implements ConnectionManager {
 
 	private static final Logger LOG =
-			Logger.getLogger(ConnectionManagerImpl.class.getName());
+			getLogger(ConnectionManagerImpl.class.getName());
 
 	private final Executor ioExecutor;
 	private final KeyManager keyManager;

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

@@ -13,7 +13,6 @@ import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
 
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -24,14 +23,16 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static java.util.Collections.emptyList;
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
 
 @ThreadSafe
 @NotNullByDefault
 class ConnectionRegistryImpl implements ConnectionRegistry {
 
 	private static final Logger LOG =
-			Logger.getLogger(ConnectionRegistryImpl.class.getName());
+			getLogger(ConnectionRegistryImpl.class.getName());
 
 	private final EventBus eventBus;
 	private final Lock lock = new ReentrantLock();
@@ -103,7 +104,7 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 		lock.lock();
 		try {
 			Multiset<ContactId> m = connections.get(t);
-			if (m == null) return Collections.emptyList();
+			if (m == null) return emptyList();
 			List<ContactId> ids = new ArrayList<>(m.keySet());
 			if (LOG.isLoggable(INFO))
 				LOG.info(ids.size() + " contacts connected: " + t);

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

@@ -52,6 +52,7 @@ import javax.inject.Inject;
 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.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
@@ -61,7 +62,7 @@ import static org.briarproject.bramble.util.LogUtils.now;
 class PluginManagerImpl implements PluginManager, Service {
 
 	private static final Logger LOG =
-			Logger.getLogger(PluginManagerImpl.class.getName());
+			getLogger(PluginManagerImpl.class.getName());
 
 	private final Executor ioExecutor;
 	private final ScheduledExecutorService scheduler;

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

@@ -36,18 +36,20 @@ import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
 
+import javax.annotation.concurrent.GuardedBy;
 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.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
 class Poller implements EventListener {
 
-	private static final Logger LOG = Logger.getLogger(Poller.class.getName());
+	private static final Logger LOG = getLogger(Poller.class.getName());
 
 	private final Executor ioExecutor;
 	private final ScheduledExecutorService scheduler;
@@ -58,7 +60,8 @@ class Poller implements EventListener {
 	private final SecureRandom random;
 	private final Clock clock;
 	private final Lock lock;
-	private final Map<TransportId, ScheduledPollTask> tasks; // Locking: lock
+	@GuardedBy("lock")
+	private final Map<TransportId, ScheduledPollTask> tasks;
 
 	Poller(@IoExecutor Executor ioExecutor,
 			@Scheduler ScheduledExecutorService scheduler,

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

@@ -20,6 +20,7 @@ interface BluetoothConnectionLimiter {
 	 * Returns true if a contact connection can be opened. This method does not
 	 * need to be called for key agreement connections.
 	 */
+	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
 	boolean canOpenContactConnection();
 
 	/**

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

@@ -13,6 +13,7 @@ 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.util.LogUtils.logException;
 
 @NotNullByDefault
@@ -20,7 +21,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 
 	private static final Logger LOG =
-			Logger.getLogger(BluetoothConnectionLimiterImpl.class.getName());
+			getLogger(BluetoothConnectionLimiterImpl.class.getName());
 
 	private final Object lock = new Object();
 	// The following are locking: lock

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

@@ -37,6 +37,7 @@ import javax.annotation.Nullable;
 
 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;
@@ -54,7 +55,7 @@ import static org.briarproject.bramble.util.StringUtils.macToString;
 abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 
 	private static final Logger LOG =
-			Logger.getLogger(BluetoothPlugin.class.getName());
+			getLogger(BluetoothPlugin.class.getName());
 
 	final BluetoothConnectionLimiter connectionLimiter;
 

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

@@ -14,6 +14,7 @@ import java.io.IOException;
 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.util.LogUtils.logException;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
@@ -21,8 +22,7 @@ import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 @NotNullByDefault
 abstract class FilePlugin implements SimplexPlugin {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(FilePlugin.class.getName());
-			Logger.getLogger(FilePlugin.class.getName());
 
 	protected final SimplexPluginCallback callback;
 	protected final int maxLatency;

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

@@ -8,13 +8,14 @@ import java.io.InputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.IoUtils.tryToClose;
 
 @NotNullByDefault
 class FileTransportReader implements TransportConnectionReader {
 
 	private static final Logger LOG =
-			Logger.getLogger(FileTransportReader.class.getName());
+			getLogger(FileTransportReader.class.getName());
 
 	private final File file;
 	private final InputStream in;

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

@@ -8,13 +8,14 @@ import java.io.OutputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.IoUtils.tryToClose;
 
 @NotNullByDefault
 class FileTransportWriter implements TransportConnectionWriter {
 
 	private static final Logger LOG =
-			Logger.getLogger(FileTransportWriter.class.getName());
+			getLogger(FileTransportWriter.class.getName());
 
 	private final File file;
 	private final OutputStream out;

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

@@ -12,7 +12,6 @@ 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 org.briarproject.bramble.util.StringUtils;
 
 import java.io.IOException;
 import java.net.Inet4Address;
@@ -23,26 +22,30 @@ import java.net.Socket;
 import java.net.SocketAddress;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
+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;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_LAN;
 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.util.ByteUtils.MAX_16_BIT_UNSIGNED;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
+import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
+import static org.briarproject.bramble.util.StringUtils.join;
 
 @NotNullByDefault
 class LanTcpPlugin extends TcpPlugin {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(LanTcpPlugin.class.getName());
-			Logger.getLogger(LanTcpPlugin.class.getName());
 
 	private static final LanAddressComparator ADDRESS_COMPARATOR =
 			new LanAddressComparator();
@@ -77,12 +80,13 @@ class LanTcpPlugin extends TcpPlugin {
 				locals.add(new InetSocketAddress(local, 0));
 			}
 		}
-		Collections.sort(locals, ADDRESS_COMPARATOR);
+		//noinspection Java8ListSort
+		sort(locals, ADDRESS_COMPARATOR);
 		return locals;
 	}
 
 	private List<InetSocketAddress> parseSocketAddresses(String ipPorts) {
-		if (StringUtils.isNullOrEmpty(ipPorts)) return Collections.emptyList();
+		if (isNullOrEmpty(ipPorts)) return emptyList();
 		String[] split = ipPorts.split(SEPARATOR);
 		List<InetSocketAddress> addresses = new ArrayList<>();
 		for (String ipPort : split) {
@@ -98,24 +102,23 @@ class LanTcpPlugin extends TcpPlugin {
 		// Get the list of recently used addresses
 		String setting = callback.getSettings().get(PREF_LAN_IP_PORTS);
 		List<String> recent = new ArrayList<>();
-		if (!StringUtils.isNullOrEmpty(setting))
+		if (!isNullOrEmpty(setting)) addAll(recent, setting.split(SEPARATOR));
-			Collections.addAll(recent, setting.split(SEPARATOR));
 		// Is the address already in the list?
 		if (recent.remove(ipPort)) {
 			// Move the address to the start of the list
 			recent.add(0, ipPort);
-			setting = StringUtils.join(recent, SEPARATOR);
+			setting = join(recent, SEPARATOR);
 		} else {
 			// Add the address to the start of the list
 			recent.add(0, ipPort);
 			// Drop the least recently used address if the list is full
 			if (recent.size() > MAX_ADDRESSES)
 				recent = recent.subList(0, MAX_ADDRESSES);
-			setting = StringUtils.join(recent, SEPARATOR);
+			setting = join(recent, SEPARATOR);
 			// Update the list of addresses shared with contacts
 			List<String> shared = new ArrayList<>(recent);
-			Collections.sort(shared);
+			sort(shared);
-			String property = StringUtils.join(shared, SEPARATOR);
+			String property = join(shared, SEPARATOR);
 			TransportProperties properties = new TransportProperties();
 			properties.put(PROP_IP_PORTS, property);
 			callback.mergeLocalProperties(properties);

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

@@ -17,6 +17,7 @@ import javax.xml.parsers.ParserConfigurationException;
 
 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.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubInetAddress;
 
@@ -25,8 +26,7 @@ import static org.briarproject.bramble.util.PrivacyUtils.scrubInetAddress;
 @ParametersNotNullByDefault
 class PortMapperImpl implements PortMapper {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(PortMapperImpl.class.getName());
-			Logger.getLogger(PortMapperImpl.class.getName());
 
 	private final ShutdownManager shutdownManager;
 	private final AtomicBoolean started = new AtomicBoolean(false);

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

@@ -12,7 +12,6 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.util.IoUtils;
-import org.briarproject.bramble.util.StringUtils;
 
 import java.io.IOException;
 import java.net.InetAddress;
@@ -41,17 +40,19 @@ 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.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 {
 
+	private static final Logger LOG = getLogger(TcpPlugin.class.getName());
+
 	private static final Pattern DOTTED_QUAD =
 			Pattern.compile("^\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}$");
-	private static final Logger LOG =
-			Logger.getLogger(TcpPlugin.class.getName());
 
 	protected final Executor ioExecutor, bindExecutor;
 	protected final Backoff backoff;
@@ -84,6 +85,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 	/**
 	 * Returns true if connections to the given address can be attempted.
 	 */
+	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
 	protected abstract boolean isConnectable(InetSocketAddress remote);
 
 	TcpPlugin(Executor ioExecutor, Backoff backoff,
@@ -263,7 +265,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 
 	@Nullable
 	InetSocketAddress parseSocketAddress(String ipPort) {
-		if (StringUtils.isNullOrEmpty(ipPort)) return null;
+		if (isNullOrEmpty(ipPort)) return null;
 		String[] split = ipPort.split(":");
 		if (split.length != 2) return null;
 		String addr = split[0], port = split[1];

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

@@ -10,11 +10,12 @@ import org.briarproject.bramble.api.properties.TransportProperties;
 import java.net.Inet4Address;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
-import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.Executor;
 
+import static java.util.Collections.emptyList;
+import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.api.plugin.WanTcpConstants.ID;
 
 @MethodsNotNullByDefault
@@ -80,8 +81,7 @@ class WanTcpPlugin extends TcpPlugin {
 	protected List<InetSocketAddress> getRemoteSocketAddresses(
 			TransportProperties p) {
 		InetSocketAddress parsed = parseSocketAddress(p.get(PROP_IP_PORT));
-		if (parsed == null) return Collections.emptyList();
+		return parsed == null ? emptyList() : singletonList(parsed);
-		return Collections.singletonList(parsed);
 	}
 
 	@Override

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

@@ -17,24 +17,16 @@ public interface CircumventionProvider {
 	String[] BLOCKED = {"CN", "IR", "EG", "BY", "TR", "SY", "VE"};
 
 	/**
-	 * Countries where obfs4 bridge connection are likely to work.
+	 * Countries where vanilla bridge connection are likely to work.
 	 * Should be a subset of {@link #BLOCKED}.
 	 */
-	String[] BRIDGES = { "CN", "IR", "EG", "BY", "TR", "SY", "VE" };
+	String[] BRIDGES = { "EG", "BY", "TR", "SY", "VE" };
-
-	/**
-	 * Countries where obfs4 bridges won't work and meek is needed.
-	 * Should be a subset of {@link #BRIDGES}.
-	 */
-	String[] NEEDS_MEEK = {"CN", "IR"};
 
 	boolean isTorProbablyBlocked(String countryCode);
 
 	boolean doBridgesWork(String countryCode);
 
-	boolean needsMeek(String countryCode);
-
 	@IoExecutor
-	List<String> getBridges(boolean meek);
+	List<String> getBridges();
 
 }

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

@@ -22,8 +22,6 @@ class CircumventionProviderImpl implements CircumventionProvider {
 			new HashSet<>(asList(BLOCKED));
 	private static final Set<String> BRIDGES_WORK_IN_COUNTRIES =
 			new HashSet<>(asList(BRIDGES));
-	private static final Set<String> BRIDGES_NEED_MEEK =
-			new HashSet<>(asList(NEEDS_MEEK));
 
 	@Nullable
 	private volatile List<String> bridges = null;
@@ -42,14 +40,9 @@ class CircumventionProviderImpl implements CircumventionProvider {
 		return BRIDGES_WORK_IN_COUNTRIES.contains(countryCode);
 	}
 
-	@Override
-	public boolean needsMeek(String countryCode) {
-		return BRIDGES_NEED_MEEK.contains(countryCode);
-	}
-
 	@Override
 	@IoExecutor
-	public List<String> getBridges(boolean useMeek) {
+	public List<String> getBridges() {
 		List<String> bridges = this.bridges;
 		if (bridges != null) return new ArrayList<>(bridges);
 
@@ -60,8 +53,6 @@ class CircumventionProviderImpl implements CircumventionProvider {
 		bridges = new ArrayList<>();
 		while (scanner.hasNextLine()) {
 			String line = scanner.nextLine();
-			boolean isMeekBridge = line.startsWith("Bridge meek");
-			if (useMeek && !isMeekBridge || !useMeek && isMeekBridge) continue;
 			if (!line.startsWith("#")) bridges.add(line);
 		}
 		scanner.close();

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

@@ -38,15 +38,11 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.io.PrintWriter;
-import java.lang.reflect.Field;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -60,8 +56,12 @@ import java.util.zip.ZipInputStream;
 import javax.annotation.Nullable;
 import javax.net.SocketFactory;
 
+import static java.util.Arrays.asList;
+import static java.util.Collections.singletonList;
+import static java.util.Collections.singletonMap;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+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.plugin.TorConstants.CONTROL_PORT;
@@ -75,6 +75,7 @@ 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.util.IoUtils.copyAndClose;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubOnion;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
@@ -83,8 +84,7 @@ import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 @ParametersNotNullByDefault
 abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
-	private static final Logger LOG =
+	private static final Logger LOG = getLogger(TorPlugin.class.getName());
-			Logger.getLogger(TorPlugin.class.getName());
 
 	private static final String[] EVENTS = {
 			"CIRC", "ORCONN", "HS_DESC", "NOTICE", "WARN", "ERR"
@@ -108,7 +108,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final ResourceProvider resourceProvider;
 	private final int maxLatency, maxIdleTime, socketTimeout;
 	private final File torDirectory, torFile, geoIpFile, obfs4File, configFile;
-	private final File doneFile, cookieFile, jtorCTLFile;
+	private final File doneFile, cookieFile;
 	private final ConnectionStatus connectionStatus;
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
@@ -153,7 +153,6 @@ 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");
-		jtorCTLFile = new File(torDirectory, "jtorctl.out");
 		connectionStatus = new ConnectionStatus();
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor =
@@ -208,19 +207,6 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		} catch (SecurityException | IOException e) {
 			throw new PluginException(e);
 		}
-		// FIXME
-		long torPid = getPid(torProcess);
-		LOG.info("Tor PID: " + torPid);
-		/*
-		pb = new ProcessBuilder("/usr/bin/strace", "-ff", "-o", "strace.out",
-				"-p", String.valueOf(torPid));
-		try {
-			pb.start();
-			LOG.info("Started strace");
-		} catch (SecurityException | IOException e) {
-			logException(LOG, WARNING, e);
-		}
-		*/
 		// Log the process's standard output until it detaches
 		if (LOG.isLoggable(INFO)) {
 			Scanner stdout = new Scanner(torProcess.getInputStream());
@@ -265,18 +251,13 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			controlSocket = new Socket("127.0.0.1", CONTROL_PORT);
 			controlConnection = new TorControlConnection(controlSocket);
 			controlConnection.authenticate(read(cookieFile));
-			controlConnection.setConf("LOG", "debug file torlog");
-			controlConnection.setDebugging(
-					new PrintWriter(new FileOutputStream(jtorCTLFile), true));
-			// FIXME Spam the control port with enable/disable network commands
-			spamControlPort();
 			// Tell Tor to exit when the control connection is closed
 			controlConnection.takeOwnership();
-			controlConnection.resetConf(Collections.singletonList(OWNER));
+			controlConnection.resetConf(singletonList(OWNER));
 			running = true;
 			// Register to receive events from the Tor process
 			controlConnection.setEventHandler(this);
-			controlConnection.setEvents(Arrays.asList(EVENTS));
+			controlConnection.setEvents(asList(EVENTS));
 			// Check whether Tor has already bootstrapped
 			String phase = controlConnection.getInfo("status/bootstrap-phase");
 			if (phase != null && phase.contains("PROGRESS=100")) {
@@ -293,38 +274,6 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		bind();
 	}
 
-	// FIXME
-	private long getPid(Process p) {
-		long pid = -1;
-		try {
-			if (p.getClass().getName().equals("java.lang.UNIXProcess")) {
-				Field f = p.getClass().getDeclaredField("pid");
-				f.setAccessible(true);
-				pid = f.getLong(p);
-				f.setAccessible(false);
-			}
-		} catch (Exception e) {
-			logException(LOG, INFO, e);
-		}
-		return pid;
-	}
-
-	// FIXME
-	private void spamControlPort() {
-		ioExecutor.execute(() -> {
-			LOG.info("Spamming control port");
-			try {
-				//noinspection InfiniteLoopStatement
-				for (boolean bridges = true; ; bridges = !bridges) {
-					LOG.info("Enable bridges " + bridges);
-					enableBridges(bridges, false);
-				}
-			} catch (IOException e) {
-				logException(LOG, WARNING, e);
-			}
-		});
-	}
-
 	private boolean assetsAreUpToDate() {
 		return doneFile.lastModified() > getLastUpdateTime();
 	}
@@ -333,28 +282,31 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		InputStream in = null;
 		OutputStream out = null;
 		try {
+			// The done file may already exist from a previous installation
+			//noinspection ResultOfMethodCallIgnored
 			doneFile.delete();
 			// Unzip the Tor binary to the filesystem
 			in = getTorInputStream();
 			out = new FileOutputStream(torFile);
-			IoUtils.copyAndClose(in, out);
+			copyAndClose(in, out);
 			// Make the Tor binary executable
 			if (!torFile.setExecutable(true, true)) throw new IOException();
 			// Unzip the GeoIP database to the filesystem
 			in = getGeoIpInputStream();
 			out = new FileOutputStream(geoIpFile);
-			IoUtils.copyAndClose(in, out);
+			copyAndClose(in, out);
 			// Unzip the Obfs4 proxy to the filesystem
 			in = getObfs4InputStream();
 			out = new FileOutputStream(obfs4File);
-			IoUtils.copyAndClose(in, out);
+			copyAndClose(in, out);
 			// Make the Obfs4 proxy executable
 			if (!obfs4File.setExecutable(true, true)) throw new IOException();
 			// Copy the config file to the filesystem
 			in = getConfigInputStream();
 			out = new FileOutputStream(configFile);
-			IoUtils.copyAndClose(in, out);
+			copyAndClose(in, out);
-			doneFile.createNewFile();
+			if (!doneFile.createNewFile())
+				LOG.warning("Failed to create done file");
 		} catch (IOException e) {
 			IoUtils.tryToClose(in, LOG, WARNING);
 			IoUtils.tryToClose(out, LOG, WARNING);
@@ -463,8 +415,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (!running) return;
 		LOG.info("Creating hidden service");
 		String privKey = settings.get(HS_PRIVKEY);
-		Map<Integer, String> portLines =
+		Map<Integer, String> portLines = singletonMap(80, "127.0.0.1:" + port);
-				Collections.singletonMap(80, "127.0.0.1:" + port);
 		Map<String, String> response;
 		try {
 			// Use the control connection to set up the hidden service
@@ -523,19 +474,13 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (!enable) callback.transportDisabled();
 	}
 
-	private void enableBridges(boolean enable, boolean needsMeek)
+	private void enableBridges(boolean enable) throws IOException {
-			throws IOException {
 		if (enable) {
 			Collection<String> conf = new ArrayList<>();
 			conf.add("UseBridges 1");
-			if (needsMeek) {
+			conf.add("ClientTransportPlugin obfs4 exec " +
-				conf.add("ClientTransportPlugin meek_lite exec " +
+					obfs4File.getAbsolutePath());
-						obfs4File.getAbsolutePath());
+			conf.addAll(circumventionProvider.getBridges());
-			} else {
-				conf.add("ClientTransportPlugin obfs4 exec " +
-						obfs4File.getAbsolutePath());
-			}
-			conf.addAll(circumventionProvider.getBridges(needsMeek));
 			controlConnection.setConf(conf);
 		} else {
 			controlConnection.setConf("UseBridges", "0");
@@ -775,17 +720,12 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 					enableNetwork(false);
 				} else if (network == PREF_TOR_NETWORK_WITH_BRIDGES ||
 						(automatic && bridgesWork)) {
-					if (circumventionProvider.needsMeek(country)) {
+					LOG.info("Enabling network, using bridges");
-						LOG.info("Enabling network, using meek bridges");
+					enableBridges(true);
-						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);
+					enableBridges(false);
 					enableNetwork(true);
 				}
 				if (online && wifi && charging) {

bramble-core/src/main/java/org/briarproject/bramble/record/RecordReaderImpl.java

@@ -4,7 +4,6 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordReader;
-import org.briarproject.bramble.util.ByteUtils;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -14,6 +13,7 @@ import javax.annotation.concurrent.NotThreadSafe;
 
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.record.Record.RECORD_HEADER_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.readUint16;
 
 @NotThreadSafe
 @NotNullByDefault
@@ -31,7 +31,7 @@ class RecordReaderImpl implements RecordReader {
 		in.readFully(header);
 		byte protocolVersion = header[0];
 		byte recordType = header[1];
-		int payloadLength = ByteUtils.readUint16(header, 2);
+		int payloadLength = readUint16(header, 2);
 		if (payloadLength < 0 || payloadLength > MAX_RECORD_PAYLOAD_BYTES)
 			throw new FormatException();
 		byte[] payload = new byte[payloadLength];

bramble-core/src/main/java/org/briarproject/bramble/record/RecordWriterImpl.java

@@ -3,7 +3,6 @@ package org.briarproject.bramble.record;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordWriter;
-import org.briarproject.bramble.util.ByteUtils;
 
 import java.io.IOException;
 import java.io.OutputStream;
@@ -11,6 +10,7 @@ import java.io.OutputStream;
 import javax.annotation.concurrent.NotThreadSafe;
 
 import static org.briarproject.bramble.api.record.Record.RECORD_HEADER_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.writeUint16;
 
 @NotThreadSafe
 @NotNullByDefault
@@ -28,7 +28,7 @@ class RecordWriterImpl implements RecordWriter {
 		byte[] payload = r.getPayload();
 		header[0] = r.getProtocolVersion();
 		header[1] = r.getRecordType();
-		ByteUtils.writeUint16(payload.length, header, 2);
+		writeUint16(payload.length, header, 2);
 		out.write(header);
 		out.write(payload);
 	}

bramble-core/src/main/java/org/briarproject/bramble/reliability/Ack.java

@@ -1,10 +1,12 @@
 package org.briarproject.bramble.reliability;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.ByteUtils;
 
 import javax.annotation.concurrent.NotThreadSafe;
 
+import static org.briarproject.bramble.util.ByteUtils.readUint16;
+import static org.briarproject.bramble.util.ByteUtils.writeUint16;
+
 @NotThreadSafe
 @NotNullByDefault
 class Ack extends Frame {
@@ -23,10 +25,10 @@ class Ack extends Frame {
 	}
 
 	int getWindowSize() {
-		return ByteUtils.readUint16(buf, 5);
+		return readUint16(buf, 5);
 	}
 
 	void setWindowSize(int windowSize) {
-		ByteUtils.writeUint16(windowSize, buf, 5);
+		writeUint16(windowSize, buf, 5);
 	}
 }