add bt polling speedtest

.gitlab-ci.yml

@@ -1,27 +1,27 @@
-image: briar/ci-image-android:latest
+image: registry.gitlab.com/fdroid/ci-images-base:latest
+
+cache:
+  paths:
+    - .gradle/wrapper
+    - .gradle/caches
+
+before_script:
+  - set -e
+  - export GRADLE_USER_HOME=$PWD/.gradle
+  # Download OpenJDK 6 so we can compile against its standard library
+  - JDK_FILE=openjdk-6-jre-headless_6b38-1.13.10-1~deb7u1_amd64.deb
+  - if [ ! -d openjdk ]
+  - then
+  - wget -q http://ftp.uk.debian.org/debian/pool/main/o/openjdk-6/$JDK_FILE
+  - dpkg-deb -x $JDK_FILE openjdk
+  - fi
+  - export JAVA_6_HOME=$PWD/openjdk/usr/lib/jvm/java-6-openjdk-amd64
 
 test:
-  before_script:
-    - set -e
-    - export GRADLE_USER_HOME=$PWD/.gradle
-
-  cache:
-    paths:
-      - .gradle/wrapper
-      - .gradle/caches
-
   script:
-    - ./gradlew --no-daemon animalSnifferMain animalSnifferTest
+    - ./gradlew test
-    - ./gradlew --no-daemon test
 
-  after_script:
+after_script:
-    # these file change every time but should not be cached
+    # this file changes every time but should not be cached
     - rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
     - rm -fr $GRADLE_USER_HOME/caches/*/plugin-resolution/
-
-
-test_reproducible:
-  script:
-    - "curl -X POST -F token=${RELEASE_CHECK_TOKEN} -F ref=master -F variables[RELEASE_TAG]=${CI_COMMIT_REF_NAME} https://code.briarproject.org/api/v4/projects/61/trigger/pipeline"
-  only:
-    - tags

bramble-android/build.gradle

@@ -1,5 +1,11 @@
+import de.undercouch.gradle.tasks.download.Download
+import de.undercouch.gradle.tasks.download.Verify
+
+import java.security.NoSuchAlgorithmException
+
 apply plugin: 'com.android.library'
 apply plugin: 'witness'
+apply plugin: 'de.undercouch.download'
 
 android {
 	compileSdkVersion 27
@@ -8,11 +14,9 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 26
-		versionCode 10012
+		versionCode 10001
-		versionName "1.0.12"
+		versionName "1.0.1"
 		consumerProguardFiles 'proguard-rules.txt'
-
-		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 	}
 
 	compileOptions {
@@ -21,54 +25,43 @@ android {
 	}
 }
 
-configurations {
-	tor
-}
-
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	implementation 'org.briarproject:jtorctl:0.3'
+	implementation fileTree(dir: 'libs', include: '*.jar')
-	tor 'org.briarproject:tor-android:0.2.9.16@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.0.2'
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
-
-	androidTestImplementation project(path: ':bramble-api', configuration: 'testOutput')
-	androidTestImplementation project(path: ':bramble-core', configuration: 'testOutput')
-	androidTestImplementation 'com.android.support.test:runner:1.0.2'
-	androidTestAnnotationProcessor 'com.google.dagger:dagger-compiler:2.0.2'
-	androidTestCompileOnly 'javax.annotation:jsr250-api:1.0'
 }
 
 dependencyVerification {
 	verify = [
-			'com.android.tools.analytics-library:protos:26.1.3:protos-26.1.3.jar:818c9f256f141d9dafec03a1aa2b94d240b2c140acfd7ee31a8b3e6c2b9479e3',
+			'com.android.tools.analytics-library:protos:26.1.2:protos-26.1.2.jar:52672a0b42b572a06aecc3535d5068eb46c0e15d129b9f1085d3c16a1da5cdbb',
-			'com.android.tools.analytics-library:shared:26.1.3:shared-26.1.3.jar:7110706c7ada96c8b6f5ca80c478291bc7899d46277de2c48527e045442401a3',
+			'com.android.tools.analytics-library:shared:26.1.2:shared-26.1.2.jar:5c7e0eda18c6f87feeb83628c707e8aaa3298b41fb72e38efe31ad1675f9e8e9',
-			'com.android.tools.analytics-library:tracker:26.1.3:tracker-26.1.3.jar:4155424bf2ce4872da83332579a1707252bc66cbd77c5144fdc4483d0f2e1418',
+			'com.android.tools.analytics-library:tracker:26.1.2:tracker-26.1.2.jar:06f97aa0adf44ffb06f8681c6a79d9be153a08f61d21eddc42b8d3db96df4282',
-			'com.android.tools.build:apksig:3.1.3:apksig-3.1.3.jar:7e1f8e675a6e768e5b56405e41d6c3cc05befe62e601b04177de1029902c9c89',
+			'com.android.tools.build:apksig:3.1.2:apksig-3.1.2.jar:40696a4559124d1d57873d208857eee059d48859239d569c7d18374ac644a8be',
-			'com.android.tools.build:builder-model:3.1.3:builder-model-3.1.3.jar:06ad1c422d679fc698451479cb40ba863849d67bfd1de23f6d2c16d78b024b0b',
+			'com.android.tools.build:builder-model:3.1.2:builder-model-3.1.2.jar:d49bfa2a135c9562b6ca7aa4342036cfa1582c7074c2d1d93d1dae8b3a134e17',
-			'com.android.tools.build:builder-test-api:3.1.3:builder-test-api-3.1.3.jar:4d989f780436794f0f8b2f50e9e079b786571eac90f26c208ab2ae6d4012f389',
+			'com.android.tools.build:builder-test-api:3.1.2:builder-test-api-3.1.2.jar:dfe2a50b740d41b11189101062434d4283d18647e89a492ad51710c719363e9f',
-			'com.android.tools.build:builder:3.1.3:builder-3.1.3.jar:8a1092012c89d0ec1ee2eff09c5708c71ef4482a6862df8d3a44a67fccace01c',
+			'com.android.tools.build:builder:3.1.2:builder-3.1.2.jar:b60f825a42e2efe8433619fbc759f3d9effecab718279048d36881188ceb1d14',
-			'com.android.tools.build:gradle-api:3.1.3:gradle-api-3.1.3.jar:01e4df521456aef66514336f1d492346730dd1fb8f6433a89f62da834941ed72',
+			'com.android.tools.build:gradle-api:3.1.2:gradle-api-3.1.2.jar:e58bcc5b893e4583ab0f5c8ef89c4dbcce202b405a9d7fcc116d21e5357d4893',
-			'com.android.tools.build:manifest-merger:26.1.3:manifest-merger-26.1.3.jar:1e4fc7e932adb4607082409800e5e6fccb42e6c5360ae5990094bf522f3ada55',
+			'com.android.tools.build:manifest-merger:26.1.2:manifest-merger-26.1.2.jar:9c61c27ea5266573107b954acf1216d398f4d7e7ae6fad6409d6b2b767eb091c',
-			'com.android.tools.ddms:ddmlib:26.1.3:ddmlib-26.1.3.jar:c54931cd68df5d1ea2923b3b320eae47cd2307a5a916bb8674c0acf93cd1d3cd',
+			'com.android.tools.ddms:ddmlib:26.1.2:ddmlib-26.1.2.jar:18a2a5fbef36882f07d03c2b9e59eba05cf8248177bf5cbff736e4b582804c44',
-			'com.android.tools.external.com-intellij:intellij-core:26.1.3:intellij-core-26.1.3.jar:af67f5535fef2e1a28b1007a4acb8c5deb6a1e33b8afe7b11d012c9e778ebcec',
+			'com.android.tools.external.com-intellij:intellij-core:26.1.2:intellij-core-26.1.2.jar:37c5acf279f1ae3e85b1a5be3c9f15f43bde7b08f978eefefffb9c4035760c52',
-			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.3:kotlin-compiler-26.1.3.jar:c746d2859dc11cc05c84b692b3498d3a621e0929511f8440ee009c6557838fd4',
+			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.2:kotlin-compiler-26.1.2.jar:152df0bee7580326c77316b669a9d96e3b09efb1d45f545dce4147271b0b8944',
-			'com.android.tools.external.org-jetbrains:uast:26.1.3:uast-26.1.3.jar:3f3f6651d0c7685a77ecb22e9c82d6b49fdf24322c17360768dc530678f43265',
+			'com.android.tools.external.org-jetbrains:uast:26.1.2:uast-26.1.2.jar:02d39582206d3f5fc0a6cb18bfd9e8b9f9c1acb805ec6dac08b4e3a56849d279',
-			'com.android.tools.layoutlib:layoutlib-api:26.1.3:layoutlib-api-26.1.3.jar:10bc73ce706c45629872d6a999dbe12116df64e24f47ff93b7b13121ff57b4b0',
+			'com.android.tools.layoutlib:layoutlib-api:26.1.2:layoutlib-api-26.1.2.jar:20220039fcc7d799f928153beff862e704457c0f55ab44258f3745ebeb662b4f',
-			'com.android.tools.lint:lint-api:26.1.3:lint-api-26.1.3.jar:6f97323f9af8deda86278717885b5c927f3766757db89709f52d11d42b6fb751',
+			'com.android.tools.lint:lint-api:26.1.2:lint-api-26.1.2.jar:e1d5b62b870a7c566e9877a6b96b27784a4d713f8caa07fdcb4705d47a40a1d9',
-			'com.android.tools.lint:lint-checks:26.1.3:lint-checks-26.1.3.jar:73c3d53784c9ce3e6d5968506581918e0179645d20809927ca4a001dd766b001',
+			'com.android.tools.lint:lint-checks:26.1.2:lint-checks-26.1.2.jar:211e2afd58504372385d71b1e5be982c2b5121ab6fee1c04ddabeb75a8729e07',
-			'com.android.tools.lint:lint-gradle-api:26.1.3:lint-gradle-api-26.1.3.jar:7ca3c4866ec21dc21d53a9d86f752b77ace6f6c610a0c9dc877313856c733d9d',
+			'com.android.tools.lint:lint-gradle-api:26.1.2:lint-gradle-api-26.1.2.jar:71284f2a8b03c3e55c94511c9eb36f8184fbb85324325fc6b78abf5183f03d90',
-			'com.android.tools.lint:lint-gradle:26.1.3:lint-gradle-26.1.3.jar:db0c354b8f4b6f6637e31f91c564785a59ff896325331fcbc3de7458e0b6c067',
+			'com.android.tools.lint:lint-gradle:26.1.2:lint-gradle-26.1.2.jar:855f0c82b7fc690df1b7319c0774f7517f7f8f5dd4eee1f6077dcf50e07c6240',
-			'com.android.tools.lint:lint-kotlin:26.1.3:lint-kotlin-26.1.3.jar:94e2b0f4565a241561cfb8fc1222bb3f132a3b98d2a90421dbb72ee8358e7d68',
+			'com.android.tools.lint:lint-kotlin:26.1.2:lint-kotlin-26.1.2.jar:1e591f70bcbbc11569720a9bbcca2bc1f3d4f789f01f40f642848d920643d484',
-			'com.android.tools.lint:lint:26.1.3:lint-26.1.3.jar:8d5f32c989c6d191d712e90ad3ca2d1c409313599551d04d834caa44d26c78df',
+			'com.android.tools.lint:lint:26.1.2:lint-26.1.2.jar:93736c62e9f1976998c2b4aa716aea0734cdb162d05502f4af7292654aedb182',
-			'com.android.tools:annotations:26.1.3:annotations-26.1.3.jar:c950430b24ac5d58fc97e7283b8f0115f99587e76e08b4e1e2aaa780f2d77323',
+			'com.android.tools:annotations:26.1.2:annotations-26.1.2.jar:72773dcaf5c4ccca828e3c8467f1b78a8a00b3cc5f8ad1aab88fcf9379928018',
-			'com.android.tools:common:26.1.3:common-26.1.3.jar:7c31a90581a148ab219f615a59667f0dded7fa39b248529784474da3c2274ef2',
+			'com.android.tools:common:26.1.2:common-26.1.2.jar:ea4320f0c17dcbc4491896bb705c4d25ec08bd62ef02ab0579fe154e75e788e6',
-			'com.android.tools:dvlib:26.1.3:dvlib-26.1.3.jar:0cae87906f53d3f1088366a916ed180a7312b6d9919b90797f238875c8492855',
+			'com.android.tools:dvlib:26.1.2:dvlib-26.1.2.jar:1187aa4fb666595c96c4deb6bc0e0f4b7e396bde9f6243330b49a232946130ea',
-			'com.android.tools:repository:26.1.3:repository-26.1.3.jar:52d4539cc68db91b261e2a33b2c8206b26e05539078758dc28cfb3854adb4f59',
+			'com.android.tools:repository:26.1.2:repository-26.1.2.jar:8b86e512ad6d32bd76989451eefe2b271f5efce6d4d65ecb173afaf14606e01a',
-			'com.android.tools:sdk-common:26.1.3:sdk-common-26.1.3.jar:1948603ca9ff22c7ebb3178000bffa3a9dd2ca1cc5cb0c793cae08468b8fcfc1',
+			'com.android.tools:sdk-common:26.1.2:sdk-common-26.1.2.jar:23584720a60a21cdcb5b1ec10269e3013789d6805d153cc696c39ec7ce251896',
-			'com.android.tools:sdklib:26.1.3:sdklib-26.1.3.jar:4adcfaad9514607098d2c51503c39811112d3050f4d1e744c01c7f08f591032b',
+			'com.android.tools:sdklib:26.1.2:sdklib-26.1.2.jar:d3870fafc59ab8efa70d3f9649f40ee299c8ec5b58377b06e8853d7272a5bf4e',
 			'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
 			'com.google.code.gson:gson:2.7:gson-2.7.jar:2d43eb5ea9e133d2ee2405cc14f5ee08951b8361302fdd93494a3a997b508d32',
 			'com.google.dagger:dagger-compiler:2.0.2:dagger-compiler-2.0.2.jar:b74bc9de063dd4c6400b232231f2ef5056145b8fbecbf5382012007dd1c071b3',
@@ -99,8 +92,6 @@ dependencyVerification {
 			'org.apache.httpcomponents:httpmime:4.1:httpmime-4.1.jar:31629566148e8a47688ae43b420abc3ecd783ed15b33bebc00824bf24c9b15aa',
 			'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:jtorctl:0.3:jtorctl-0.3.jar:f2939238a097898998432effe93b0334d97a787972ab3a91a8973a1d309fc864',
-			'org.briarproject:tor-android:0.2.9.16:tor-android-0.2.9.16.zip:515e33dda6a30853c885a2de2c79ae1ab9ad8b6db44f5db8890333ec2e24f4ae',
 			'org.codehaus.groovy:groovy-all:2.4.12:groovy-all-2.4.12.jar:6a56af4bd48903d56bec62821876cadefafd007360cc6bd0d8f7aa8d72b38be4',
 			'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',
@@ -121,9 +112,81 @@ dependencyVerification {
 	]
 }
 
-project.afterEvaluate {
+ext.torBinaryDir = 'src/main/res/raw'
-	copy {
+ext.torVersion = '0.2.9.14'
-		from configurations.tor.collect { zipTree(it) }
+ext.geoipVersion = '2017-11-06'
-		into 'src/main/res/raw'
+ext.torDownloadUrl = 'https://briarproject.org/build/'
+
+def torBinaries = [
+		"tor_arm"    : '1710ea6c47b7f4c1a88bdf4858c7893837635db10e8866854eed8d61629f50e8',
+		"tor_arm_pie": '974e6949507db8fa2ea45231817c2c3677ed4ccf5488a2252317d744b0be1917',
+		"tor_x86"    : '3a5e45b3f051fcda9353b098b7086e762ffe7ba9242f7d7c8bf6523faaa8b1e9',
+		"tor_x86_pie": 'd1d96d8ce1a4b68accf04850185780d10cd5563d3552f7e1f040f8ca32cb4e51',
+		"geoip"      : '8239b98374493529a29096e45fc5877d4d6fdad0146ad8380b291f90d61484ea'
+]
+
+def verifyOrDeleteBinary(name, chksum, alreadyVerified) {
+	return tasks.create("verifyOrDeleteBinary${name}", VerifyOrDelete) {
+		src "${torBinaryDir}/${name}.zip"
+		algorithm 'SHA-256'
+		checksum chksum
+		result alreadyVerified
+		onlyIf {
+			src.exists()
+		}
+	}
+}
+
+def downloadBinary(name, chksum, alreadyVerified) {
+	return tasks.create([
+			name: "downloadBinary${name}",
+			type: Download,
+			dependsOn: verifyOrDeleteBinary(name, chksum, alreadyVerified)]) {
+		src "${torDownloadUrl}${name}.zip"
+				.replace('tor_', "tor-${torVersion}-")
+				.replace('geoip', "geoip-${geoipVersion}")
+				.replaceAll('_', '-')
+		dest "${torBinaryDir}/${name}.zip"
+		onlyIf {
+			!dest.exists()
+		}
+	}
+}
+
+def verifyBinary(name, chksum) {
+	boolean[] alreadyVerified = [false]
+	return tasks.create([
+			name     : "verifyBinary${name}",
+			type     : Verify,
+			dependsOn: downloadBinary(name, chksum, alreadyVerified)]) {
+		src "${torBinaryDir}/${name}.zip"
+		algorithm 'SHA-256'
+		checksum chksum
+		onlyIf {
+			!alreadyVerified[0]
+		}
+	}
+}
+
+project.afterEvaluate {
+	torBinaries.every { name, checksum ->
+		preBuild.dependsOn.add(verifyBinary(name, checksum))
+	}
+}
+
+class VerifyOrDelete extends Verify {
+
+	boolean[] result
+
+	@TaskAction
+	@Override
+	void verify() throws IOException, NoSuchAlgorithmException {
+		try {
+			super.verify()
+			result[0] = true
+		} catch (Exception e) {
+			println "${src} failed verification - deleting"
+			src.delete()
+		}
 	}
 }

bramble-android/src/androidTest/java/org/briarproject/bramble/IntegrationTestComponent.java

@@ -1,23 +0,0 @@
-package org.briarproject.bramble;
-
-import org.briarproject.bramble.event.EventModule;
-import org.briarproject.bramble.plugin.PluginModule;
-import org.briarproject.bramble.plugin.tor.BridgeTest;
-import org.briarproject.bramble.system.SystemModule;
-
-import javax.inject.Singleton;
-
-import dagger.Component;
-
-@Singleton
-@Component(modules = {
-		BrambleAndroidModule.class,
-		PluginModule.class,  // needed for BackoffFactory
-		EventModule.class,
-		SystemModule.class,
-})
-public interface IntegrationTestComponent {
-
-	void inject(BridgeTest init);
-
-}

bramble-android/src/androidTest/java/org/briarproject/bramble/plugin/tor/BridgeTest.java

@@ -1,126 +0,0 @@
-package org.briarproject.bramble.plugin.tor;
-
-import android.content.Context;
-import android.support.test.runner.AndroidJUnit4;
-
-import org.briarproject.bramble.DaggerIntegrationTestComponent;
-import org.briarproject.bramble.IntegrationTestComponent;
-import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.plugin.BackoffFactory;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
-import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.system.LocationUtils;
-import org.briarproject.bramble.test.BrambleTestCase;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import java.util.List;
-import java.util.concurrent.Executor;
-import java.util.concurrent.Executors;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledThreadPoolExecutor;
-import java.util.logging.Logger;
-
-import javax.inject.Inject;
-import javax.net.SocketFactory;
-
-import static android.support.test.InstrumentationRegistry.getTargetContext;
-import static java.util.Collections.singletonList;
-import static java.util.concurrent.TimeUnit.SECONDS;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
-
-@RunWith(AndroidJUnit4.class)
-public class BridgeTest extends BrambleTestCase {
-
-	private final static long TIMEOUT = SECONDS.toMillis(23);
-
-	private final static Logger LOG =
-			Logger.getLogger(BridgeTest.class.getSimpleName());
-
-	@Inject
-	EventBus eventBus;
-	@Inject
-	BackoffFactory backoffFactory;
-	@Inject
-	Clock clock;
-
-	private final Context appContext = getTargetContext();
-	private final CircumventionProvider circumventionProvider;
-	private final List<String> bridges;
-	private TorPluginFactory factory;
-	private volatile int currentBridge = 0;
-
-	public BridgeTest() {
-		super();
-		circumventionProvider = new CircumventionProvider() {
-			@Override
-			public boolean isTorProbablyBlocked(String countryCode) {
-				return true;
-			}
-
-			@Override
-			public boolean doBridgesWork(String countryCode) {
-				return true;
-			}
-
-			@Override
-			public List<String> getBridges() {
-				return singletonList(bridges.get(currentBridge));
-			}
-		};
-		bridges = new CircumventionProviderImpl(appContext).getBridges();
-	}
-
-	@Before
-	public void setUp() {
-		IntegrationTestComponent component =
-				DaggerIntegrationTestComponent.builder().build();
-		component.inject(this);
-
-		Executor ioExecutor = Executors.newCachedThreadPool();
-		ScheduledExecutorService scheduler = new ScheduledThreadPoolExecutor(1);
-		LocationUtils locationUtils = () -> "US";
-		SocketFactory torSocketFactory = SocketFactory.getDefault();
-
-		factory = new TorPluginFactory(ioExecutor, scheduler, appContext,
-				locationUtils, eventBus, torSocketFactory,
-				backoffFactory, circumventionProvider, clock);
-	}
-
-	@Test
-	public void testBridges() throws Exception {
-		assertTrue(bridges.size() > 0);
-
-		for (int i = 0; i < bridges.size(); i++) {
-			testBridge(i);
-		}
-	}
-
-	private void testBridge(int bridge) throws Exception {
-		DuplexPlugin duplexPlugin =
-				factory.createPlugin(new TorPluginCallBack());
-		assertNotNull(duplexPlugin);
-		TorPlugin plugin = (TorPlugin) duplexPlugin;
-
-		currentBridge = bridge;
-		LOG.warning("Testing " + bridges.get(currentBridge));
-		try {
-			plugin.start();
-			long start = clock.currentTimeMillis();
-			while (clock.currentTimeMillis() - start < TIMEOUT) {
-				if (plugin.isRunning()) return;
-				clock.sleep(500);
-			}
-			if (!plugin.isRunning()) {
-				fail("Could not connect to Tor within timeout.");
-			}
-		} finally {
-			plugin.stop();
-		}
-	}
-
-}

bramble-android/src/androidTest/java/org/briarproject/bramble/plugin/tor/TorPluginCallBack.java

@@ -1,54 +0,0 @@
-package org.briarproject.bramble.plugin.tor;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-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.api.settings.Settings;
-
-@NotNullByDefault
-public class TorPluginCallBack implements DuplexPluginCallback {
-
-	@Override
-	public void incomingConnectionCreated(DuplexTransportConnection d) {
-
-	}
-
-	@Override
-	public void outgoingConnectionCreated(ContactId c,
-			DuplexTransportConnection d) {
-
-	}
-
-	@Override
-	public Settings getSettings() {
-		return new Settings();
-	}
-
-	@Override
-	public TransportProperties getLocalProperties() {
-		return new TransportProperties();
-	}
-
-	@Override
-	public void mergeSettings(Settings s) {
-
-	}
-
-	@Override
-	public void mergeLocalProperties(TransportProperties p) {
-
-	}
-
-	@Override
-	public void transportEnabled() {
-
-	}
-
-	@Override
-	public void transportDisabled() {
-
-	}
-
-}

bramble-android/src/main/AndroidManifest.xml

@@ -2,13 +2,14 @@
 	package="org.briarproject.bramble"
 	xmlns:android="http://schemas.android.com/apk/res/android">
 
-	<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
+	<uses-feature android:name="android.hardware.bluetooth"/>
 
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
 	<uses-permission android:name="android.permission.BLUETOOTH"/>
 	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
 	<uses-permission android:name="android.permission.INTERNET"/>
+	<uses-permission android:name="android.permission.READ_LOGS"/>
 	<uses-permission android:name="android.permission.WAKE_LOCK"/>
 
 	<application

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

@@ -1,25 +1,13 @@
 package org.briarproject.bramble;
 
-import android.app.Application;
+import org.briarproject.bramble.plugin.AndroidPluginModule;
-
-import org.briarproject.bramble.plugin.tor.CircumventionProvider;
-import org.briarproject.bramble.plugin.tor.CircumventionProviderImpl;
 import org.briarproject.bramble.system.AndroidSystemModule;
 
-import javax.inject.Singleton;
-
 import dagger.Module;
-import dagger.Provides;
 
 @Module(includes = {
+		AndroidPluginModule.class,
 		AndroidSystemModule.class
 })
 public class BrambleAndroidModule {
-
-	@Provides
-	@Singleton
-	CircumventionProvider provideCircumventionProvider(Application app) {
-		return new CircumventionProviderImpl(app.getApplicationContext());
-	}
-
 }

bramble-android/src/main/java/org/briarproject/bramble/plugin/AndroidPluginModule.java

@@ -0,0 +1,69 @@
+package org.briarproject.bramble.plugin;
+
+import android.app.Application;
+import android.content.Context;
+
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.BackoffFactory;
+import org.briarproject.bramble.api.plugin.PluginConfig;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
+import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
+import org.briarproject.bramble.api.reporting.DevReporter;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.api.system.Scheduler;
+import org.briarproject.bramble.plugin.bluetooth.AndroidBluetoothPluginFactory;
+import org.briarproject.bramble.plugin.tcp.AndroidLanTcpPluginFactory;
+import org.briarproject.bramble.plugin.tor.TorPluginFactory;
+
+import java.security.SecureRandom;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
+
+import javax.net.SocketFactory;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class AndroidPluginModule {
+
+	@Provides
+	PluginConfig providePluginConfig(@IoExecutor Executor ioExecutor,
+			@Scheduler ScheduledExecutorService scheduler,
+			AndroidExecutor androidExecutor, SecureRandom random,
+			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
+			Application app, LocationUtils locationUtils, DevReporter reporter,
+			EventBus eventBus) {
+		Context appContext = app.getApplicationContext();
+		DuplexPluginFactory bluetooth =
+				new AndroidBluetoothPluginFactory(ioExecutor, androidExecutor,
+						appContext, random, eventBus, backoffFactory);
+		DuplexPluginFactory tor = new TorPluginFactory(ioExecutor, scheduler,
+				appContext, locationUtils, reporter, eventBus,
+				torSocketFactory, backoffFactory);
+		DuplexPluginFactory lan = new AndroidLanTcpPluginFactory(ioExecutor,
+				scheduler, backoffFactory, appContext);
+		Collection<DuplexPluginFactory> duplex =
+				Arrays.asList(bluetooth, tor, lan);
+		@NotNullByDefault
+		PluginConfig pluginConfig = new PluginConfig() {
+
+			@Override
+			public Collection<DuplexPluginFactory> getDuplexFactories() {
+				return duplex;
+			}
+
+			@Override
+			public Collection<SimplexPluginFactory> getSimplexFactories() {
+				return Collections.emptyList();
+			}
+		};
+		return pluginConfig;
+	}
+}

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

@@ -38,7 +38,6 @@ import static android.bluetooth.BluetoothAdapter.SCAN_MODE_NONE;
 import static android.bluetooth.BluetoothAdapter.STATE_OFF;
 import static android.bluetooth.BluetoothAdapter.STATE_ON;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -146,7 +145,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -186,7 +185,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 

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

@@ -1,30 +0,0 @@
-package org.briarproject.bramble.plugin.tor;
-
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
-
-import java.util.List;
-
-public interface CircumventionProvider {
-
-	/**
-	 * Countries where Tor is blocked, i.e. vanilla Tor connection won't work.
-	 *
-	 * See https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
-	 * and https://trac.torproject.org/projects/tor/wiki/doc/OONI/censorshipwiki
-	 */
-	String[] BLOCKED = {"CN", "IR", "EG", "BY", "TR", "SY", "VE"};
-
-	/**
-	 * Countries where vanilla bridge connection are likely to work.
-	 * Should be a subset of {@link #BLOCKED}.
-	 */
-	String[] BRIDGES = { "EG", "BY", "TR", "SY", "VE" };
-
-	boolean isTorProbablyBlocked(String countryCode);
-
-	boolean doBridgesWork(String countryCode);
-
-	@IoExecutor
-	List<String> getBridges();
-
-}

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

@@ -1,68 +0,0 @@
-package org.briarproject.bramble.plugin.tor;
-
-import android.content.Context;
-import android.content.res.Resources;
-
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
-
-import java.io.InputStream;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Scanner;
-import java.util.Set;
-
-import javax.annotation.Nullable;
-import javax.inject.Inject;
-
-public class CircumventionProviderImpl implements CircumventionProvider {
-
-	private final static String BRIDGE_FILE_NAME = "bridges";
-
-	private final Context ctx;
-	@Nullable
-	private volatile List<String> bridges = null;
-
-	@Inject
-	public CircumventionProviderImpl(Context ctx) {
-		this.ctx = ctx;
-	}
-
-	private static final Set<String> BLOCKED_IN_COUNTRIES =
-			new HashSet<>(Arrays.asList(BLOCKED));
-	private static final Set<String> BRIDGES_WORK_IN_COUNTRIES =
-			new HashSet<>(Arrays.asList(BRIDGES));
-
-	@Override
-	public boolean isTorProbablyBlocked(String countryCode) {
-		return BLOCKED_IN_COUNTRIES.contains(countryCode);
-	}
-
-	@Override
-	public boolean doBridgesWork(String countryCode) {
-		return BRIDGES_WORK_IN_COUNTRIES.contains(countryCode);
-	}
-
-	@Override
-	@IoExecutor
-	public List<String> getBridges() {
-		if (this.bridges != null) return this.bridges;
-
-		Resources res = ctx.getResources();
-		int resId = res.getIdentifier(BRIDGE_FILE_NAME, "raw",
-				ctx.getPackageName());
-		InputStream is = ctx.getResources().openRawResource(resId);
-		Scanner scanner = new Scanner(is);
-
-		List<String> bridges = new ArrayList<>();
-		while (scanner.hasNextLine()) {
-			String line = scanner.nextLine();
-			if (!line.startsWith("#")) bridges.add(line);
-		}
-		scanner.close();
-		this.bridges = bridges;
-		return bridges;
-	}
-
-}

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

@@ -0,0 +1,18 @@
+package org.briarproject.bramble.plugin.tor;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+class TorNetworkMetadata {
+
+	// See https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+	// and https://trac.torproject.org/projects/tor/wiki/doc/OONI/censorshipwiki
+	// TODO: get a more complete list
+	private static final Set<String> BLOCKED_IN_COUNTRIES =
+			new HashSet<>(Arrays.asList("CN", "IR", "SY", "ZZ"));
+
+	static boolean isTorProbablyBlocked(String countryCode) {
+		return BLOCKED_IN_COUNTRIES.contains(countryCode);
+	}
+}

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

@@ -10,6 +10,7 @@ import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.res.Resources;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
+import android.os.FileObserver;
 import android.os.PowerManager;
 
 import net.freehaven.tor.control.EventHandler;
@@ -31,12 +32,12 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 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.api.reporting.DevReporter;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
-import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.util.AndroidUtils;
 import org.briarproject.bramble.util.IoUtils;
-import org.briarproject.bramble.util.RenewableWakeLock;
 import org.briarproject.bramble.util.StringUtils;
 
 import java.io.Closeable;
@@ -50,7 +51,6 @@ import java.io.OutputStream;
 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;
@@ -58,6 +58,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Scanner;
+import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Future;
 import java.util.concurrent.ScheduledExecutorService;
@@ -80,6 +81,7 @@ 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 android.os.PowerManager.PARTIAL_WAKE_LOCK;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.concurrent.TimeUnit.MINUTES;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
@@ -93,7 +95,6 @@ import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_WIFI;
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_PORT;
 import static org.briarproject.bramble.api.plugin.TorConstants.PROP_ONION;
-import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubOnion;
 
 @MethodsNotNullByDefault
@@ -104,11 +105,8 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			"CIRC", "ORCONN", "HS_DESC", "NOTICE", "WARN", "ERR"
 	};
 	private static final String OWNER = "__OwningControllerProcess";
-	private static final int COOKIE_TIMEOUT_MS = 3000;
+	private static final int COOKIE_TIMEOUT = 3000; // Milliseconds
-	private static final int COOKIE_POLLING_INTERVAL_MS = 200;
 	private static final Pattern ONION = Pattern.compile("[a-z2-7]{16}");
-	// This tag may prevent Huawei's power manager from killing us
-	private static final String WAKE_LOCK_TAG = "LocationManagerService";
 	private static final Logger LOG =
 			Logger.getLogger(TorPlugin.class.getName());
 
@@ -116,17 +114,16 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final ScheduledExecutorService scheduler;
 	private final Context appContext;
 	private final LocationUtils locationUtils;
+	private final DevReporter reporter;
 	private final SocketFactory torSocketFactory;
-	private final Clock clock;
 	private final Backoff backoff;
 	private final DuplexPluginCallback callback;
 	private final String architecture;
-	private final CircumventionProvider circumventionProvider;
 	private final int maxLatency, maxIdleTime, socketTimeout;
 	private final ConnectionStatus connectionStatus;
 	private final File torDirectory, torFile, geoIpFile, configFile;
 	private final File doneFile, cookieFile;
-	private final RenewableWakeLock wakeLock;
+	private final PowerManager.WakeLock wakeLock;
 	private final AtomicReference<Future<?>> connectivityCheck =
 			new AtomicReference<>();
 	private final AtomicBoolean used = new AtomicBoolean(false);
@@ -139,19 +136,18 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 	TorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
 			Context appContext, LocationUtils locationUtils,
-			SocketFactory torSocketFactory, Clock clock, Backoff backoff,
+			DevReporter reporter, SocketFactory torSocketFactory,
-			DuplexPluginCallback callback, String architecture,
+			Backoff backoff, DuplexPluginCallback callback,
-			CircumventionProvider circumventionProvider, int maxLatency, int maxIdleTime) {
+			String architecture, int maxLatency, int maxIdleTime) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
 		this.locationUtils = locationUtils;
+		this.reporter = reporter;
 		this.torSocketFactory = torSocketFactory;
-		this.clock = clock;
 		this.backoff = backoff;
 		this.callback = callback;
 		this.architecture = architecture;
-		this.circumventionProvider = circumventionProvider;
 		this.maxLatency = maxLatency;
 		this.maxIdleTime = maxIdleTime;
 		if (maxIdleTime > Integer.MAX_VALUE / 2)
@@ -164,13 +160,14 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		configFile = new File(torDirectory, "torrc");
 		doneFile = new File(torDirectory, "done");
 		cookieFile = new File(torDirectory, ".tor/control_auth_cookie");
+		Object o = appContext.getSystemService(POWER_SERVICE);
+		PowerManager pm = (PowerManager) o;
+		// This tag will prevent Huawei's powermanager from killing us.
+		wakeLock = pm.newWakeLock(PARTIAL_WAKE_LOCK, "LocationManagerService");
+		wakeLock.setReferenceCounted(false);
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor = new PoliteExecutor("TorPlugin",
 				ioExecutor, 1);
-		PowerManager pm = (PowerManager)
-				appContext.getSystemService(POWER_SERVICE);
-		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
-				WAKE_LOCK_TAG, 1, MINUTES);
 	}
 
 	@Override
@@ -193,10 +190,18 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (used.getAndSet(true)) throw new IllegalStateException();
 		// Install or update the assets if necessary
 		if (!assetsAreUpToDate()) installAssets();
-		if (cookieFile.exists() && !cookieFile.delete())
-			LOG.warning("Old auth cookie not deleted");
-		// Start a new Tor process
 		LOG.info("Starting Tor");
+		// Watch for the auth cookie file being updated
+		try {
+			cookieFile.getParentFile().mkdirs();
+			cookieFile.createNewFile();
+		} catch (IOException e) {
+			throw new PluginException(e);
+		}
+		CountDownLatch latch = new CountDownLatch(1);
+		FileObserver obs = new WriteObserver(cookieFile, latch);
+		obs.startWatching();
+		// Start a new Tor process
 		String torPath = torFile.getAbsolutePath();
 		String configPath = configFile.getAbsolutePath();
 		String pid = String.valueOf(android.os.Process.myPid());
@@ -235,16 +240,11 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				throw new PluginException();
 			}
 			// Wait for the auth cookie file to be created/updated
-			long start = clock.currentTimeMillis();
+			if (!latch.await(COOKIE_TIMEOUT, MILLISECONDS)) {
-			while (cookieFile.length() < 32) {
+				LOG.warning("Auth cookie not created");
-				if (clock.currentTimeMillis() - start > COOKIE_TIMEOUT_MS) {
+				if (LOG.isLoggable(INFO)) listFiles(torDirectory);
-					LOG.warning("Auth cookie not created");
+				throw new PluginException();
-					if (LOG.isLoggable(INFO)) listFiles(torDirectory);
-					throw new PluginException();
-				}
-				Thread.sleep(COOKIE_POLLING_INTERVAL_MS);
 			}
-			LOG.info("Auth cookie created");
 		} catch (InterruptedException e) {
 			LOG.warning("Interrupted while starting Tor");
 			Thread.currentThread().interrupt();
@@ -338,7 +338,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		return zin;
 	}
 
-	private InputStream getConfigInputStream() {
+	private InputStream getConfigInputStream() throws IOException {
 		int resId = getResourceId("torrc");
 		return appContext.getResources().openRawResource(resId);
 	}
@@ -352,7 +352,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -360,7 +360,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (s != null) s.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -369,7 +369,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			File[] children = f.listFiles();
 			if (children != null) for (File child : children) listFiles(child);
 		} else {
-			LOG.info(f.getAbsolutePath() + " " + f.length());
+			LOG.info(f.getAbsolutePath());
 		}
 	}
 
@@ -389,6 +389,14 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 	}
 
+	private void sendDevReports() {
+		ioExecutor.execute(() -> {
+			// TODO: Trigger this with a TransportEnabledEvent
+			File reportDir = AndroidUtils.getReportDir(appContext);
+			reporter.sendReports(reportDir);
+		});
+	}
+
 	private void bind() {
 		ioExecutor.execute(() -> {
 			// If there's already a port number stored in config, reuse it
@@ -402,7 +410,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				ss = new ServerSocket();
 				ss.bind(new InetSocketAddress("127.0.0.1", port));
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				tryToClose(ss);
 				return;
 			}
@@ -428,7 +436,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		} finally {
 			callback.transportDisabled();
 		}
@@ -447,7 +455,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				response = controlConnection.addOnion(portLines);
 			else response = controlConnection.addOnion(privKey, portLines);
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return;
 		}
 		if (!response.containsKey(HS_ADDRESS)) {
@@ -502,19 +510,8 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 	}
 
-	private void enableBridges(boolean enable) throws IOException {
-		if (enable) {
-			Collection<String> conf = new ArrayList<>();
-			conf.add("UseBridges 1");
-			conf.addAll(circumventionProvider.getBridges());
-			controlConnection.setConf(conf);
-		} else {
-			controlConnection.setConf("UseBridges", "0");
-		}
-	}
-
 	@Override
-	public void stop() {
+	public void stop() throws PluginException {
 		running = false;
 		tryToClose(socket);
 		if (networkStateReceiver != null)
@@ -526,7 +523,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				controlConnection.shutdownTor("TERM");
 				controlSocket.close();
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 		wakeLock.release();
@@ -548,16 +545,20 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public void poll(Map<ContactId, TransportProperties> contacts) {
+	public void poll(Collection<ContactId> connected) {
 		if (!isRunning()) return;
 		backoff.increment();
-		for (Entry<ContactId, TransportProperties> e : contacts.entrySet()) {
+		Map<ContactId, TransportProperties> remote =
-			connectAndCallBack(e.getKey(), e.getValue());
+				callback.getRemoteProperties();
+		for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
+			ContactId c = e.getKey();
+			if (!connected.contains(c)) connectAndCallBack(c, e.getValue());
 		}
 	}
 
 	private void connectAndCallBack(ContactId c, TransportProperties p) {
 		ioExecutor.execute(() -> {
+			if (!isRunning()) return;
 			DuplexTransportConnection d = createConnection(p);
 			if (d != null) {
 				backoff.reset();
@@ -567,8 +568,13 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public DuplexTransportConnection createConnection(TransportProperties p) {
+	public DuplexTransportConnection createConnection(ContactId c) {
 		if (!isRunning()) return null;
+		return createConnection(callback.getRemoteProperties(c));
+	}
+
+	@Nullable
+	private DuplexTransportConnection createConnection(TransportProperties p) {
 		String onion = p.get(PROP_ONION);
 		if (StringUtils.isNullOrEmpty(onion)) return null;
 		if (!ONION.matcher(onion).matches()) {
@@ -618,7 +624,10 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				connectionStatus.getAndSetCircuitBuilt()) {
 			LOG.info("First circuit built");
 			backoff.reset();
-			if (isRunning()) callback.transportEnabled();
+			if (isRunning()) {
+				sendDevReports();
+				callback.transportEnabled();
+			}
 		}
 	}
 
@@ -647,7 +656,10 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (severity.equals("NOTICE") && msg.startsWith("Bootstrapped 100%")) {
 			connectionStatus.setBootstrapped();
 			backoff.reset();
-			if (isRunning()) callback.transportEnabled();
+			if (isRunning()) {
+				sendDevReports();
+				callback.transportEnabled();
+			}
 		}
 	}
 
@@ -657,6 +669,22 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			LOG.info("Descriptor uploaded");
 	}
 
+	private static class WriteObserver extends FileObserver {
+
+		private final CountDownLatch latch;
+
+		private WriteObserver(File file, CountDownLatch latch) {
+			super(file.getAbsolutePath(), CLOSE_WRITE);
+			this.latch = latch;
+		}
+
+		@Override
+		public void onEvent(int event, @Nullable String path) {
+			stopWatching();
+			latch.countDown();
+		}
+	}
+
 	@Override
 	public void eventOccurred(Event e) {
 		if (e instanceof SettingsUpdatedEvent) {
@@ -677,8 +705,8 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			boolean online = net != null && net.isConnected();
 			boolean wifi = online && net.getType() == TYPE_WIFI;
 			String country = locationUtils.getCurrentCountry();
-			boolean blocked =
+			boolean blocked = TorNetworkMetadata.isTorProbablyBlocked(
-					circumventionProvider.isTorProbablyBlocked(country);
+					country);
 			Settings s = callback.getSettings();
 			int network = s.getInt(PREF_TOR_NETWORK, PREF_TOR_NETWORK_ALWAYS);
 
@@ -692,26 +720,19 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				if (!online) {
 					LOG.info("Disabling network, device is offline");
 					enableNetwork(false);
+				} else if (blocked) {
+					LOG.info("Disabling network, country is blocked");
+					enableNetwork(false);
 				} else if (network == PREF_TOR_NETWORK_NEVER
 						|| (network == PREF_TOR_NETWORK_WIFI && !wifi)) {
 					LOG.info("Disabling network due to data setting");
 					enableNetwork(false);
-				} else if (blocked) {
-					if (circumventionProvider.doBridgesWork(country)) {
-						LOG.info("Enabling network, using bridges");
-						enableBridges(true);
-						enableNetwork(true);
-					} else {
-						LOG.info("Disabling network, country is blocked");
-						enableNetwork(false);
-					}
 				} else {
 					LOG.info("Enabling network");
-					enableBridges(false);
 					enableNetwork(true);
 				}
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		});
 	}

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

@@ -12,7 +12,7 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.reporting.DevReporter;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.util.AndroidUtils;
 
@@ -40,27 +40,24 @@ public class TorPluginFactory implements DuplexPluginFactory {
 	private final ScheduledExecutorService scheduler;
 	private final Context appContext;
 	private final LocationUtils locationUtils;
+	private final DevReporter reporter;
 	private final EventBus eventBus;
 	private final SocketFactory torSocketFactory;
 	private final BackoffFactory backoffFactory;
-	private final CircumventionProvider circumventionProvider;
-	private final Clock clock;
 
 	public TorPluginFactory(Executor ioExecutor,
 			ScheduledExecutorService scheduler, Context appContext,
-			LocationUtils locationUtils, EventBus eventBus,
+			LocationUtils locationUtils, DevReporter reporter,
-			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
+			EventBus eventBus, SocketFactory torSocketFactory,
-			CircumventionProvider circumventionProvider,
+			BackoffFactory backoffFactory) {
-			Clock clock) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
 		this.locationUtils = locationUtils;
+		this.reporter = reporter;
 		this.eventBus = eventBus;
 		this.torSocketFactory = torSocketFactory;
 		this.backoffFactory = backoffFactory;
-		this.circumventionProvider = circumventionProvider;
-		this.clock = clock;
 	}
 
 	@Override
@@ -97,8 +94,8 @@ public class TorPluginFactory implements DuplexPluginFactory {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		TorPlugin plugin = new TorPlugin(ioExecutor, scheduler, appContext,
-				locationUtils, torSocketFactory, clock, backoff, callback,
+				locationUtils, reporter, torSocketFactory, backoff, callback,
-				architecture, circumventionProvider, MAX_LATENCY, MAX_IDLE_TIME);
+				architecture, MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

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

@@ -9,7 +9,6 @@ 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;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -67,12 +66,9 @@ class AndroidSecureRandomProvider extends LinuxSecureRandomProvider {
 
 	@Override
 	protected void writeSeed() {
-		// Silence strict mode
-		StrictMode.ThreadPolicy tp = StrictMode.allowThreadDiskWrites();
 		super.writeSeed();
 		if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT <= 18)
 			applyOpenSslFix();
-		StrictMode.setThreadPolicy(tp);
 	}
 
 	// Based on https://android-developers.googleblog.com/2013/08/some-securerandom-thoughts.html

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

@@ -1,9 +1,7 @@
 package org.briarproject.bramble.util;
 
-import android.annotation.SuppressLint;
 import android.bluetooth.BluetoothAdapter;
 import android.content.Context;
-import android.content.SharedPreferences;
 import android.os.Build;
 import android.provider.Settings;
 
@@ -12,15 +10,11 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
-import java.util.logging.Logger;
 
 import static android.content.Context.MODE_PRIVATE;
 
 public class AndroidUtils {
 
-	private static final Logger LOG =
-			Logger.getLogger(AndroidUtils.class.getName());
-
 	// Fake Bluetooth address returned by BluetoothAdapter on API 23 and later
 	private static final String FAKE_BLUETOOTH_ADDRESS = "02:00:00:00:00:00";
 
@@ -41,7 +35,6 @@ public class AndroidUtils {
 	public static String getBluetoothAddress(Context ctx,
 			BluetoothAdapter adapter) {
 		// Return the adapter's address if it's valid and not fake
-		@SuppressLint("HardwareIds")
 		String address = adapter.getAddress();
 		if (isValidBluetoothAddress(address)) return address;
 		// Return the address from settings if it's valid and not fake
@@ -58,28 +51,17 @@ public class AndroidUtils {
 				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
 	}
 
-	public static void deleteAppData(Context ctx, SharedPreferences... clear) {
+	public static void deleteAppData(Context ctx) {
-		// Clear and commit shared preferences
-		for (SharedPreferences prefs : clear) {
-			if (!prefs.edit().clear().commit())
-				LOG.warning("Could not clear shared preferences");
-		}
-		// Delete files, except lib and shared_prefs directories
 		File dataDir = new File(ctx.getApplicationInfo().dataDir);
 		File[] children = dataDir.listFiles();
-		if (children == null) {
+		if (children != null) {
-			LOG.warning("Could not list files in app data dir");
-		} else {
 			for (File child : children) {
-				String name = child.getName();
+				if (!child.getName().equals("lib"))
-				if (!name.equals("lib") && !name.equals("shared_prefs")) {
 					IoUtils.deleteFileOrDir(child);
-				}
 			}
 		}
 		// Recreate the cache dir as some OpenGL drivers expect it to exist
-		if (!new File(dataDir, "cache").mkdir())
+		new File(dataDir, "cache").mkdir();
-			LOG.warning("Could not recreate cache dir");
 	}
 
 	public static File getReportDir(Context ctx) {

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

@@ -1,100 +0,0 @@
-package org.briarproject.bramble.util;
-
-import android.os.PowerManager;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledFuture;
-import java.util.concurrent.TimeUnit;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.ThreadSafe;
-
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static java.util.logging.Level.INFO;
-
-@ThreadSafe
-@NotNullByDefault
-public class RenewableWakeLock {
-
-	private static final Logger LOG =
-			Logger.getLogger(RenewableWakeLock.class.getName());
-
-	/**
-	 * Automatically release the lock this many milliseconds after it's due
-	 * to have been replaced and released.
-	 */
-	private static final int SAFETY_MARGIN_MS = 10_000;
-
-	private final PowerManager powerManager;
-	private final ScheduledExecutorService scheduler;
-	private final int levelAndFlags;
-	private final String tag;
-	private final long durationMs;
-	private final Runnable renewTask;
-
-	private final Object lock = new Object();
-	@Nullable
-	private PowerManager.WakeLock wakeLock; // Locking: lock
-	@Nullable
-	private ScheduledFuture future; // Locking: lock
-
-	public RenewableWakeLock(PowerManager powerManager,
-			ScheduledExecutorService scheduler, int levelAndFlags, String tag,
-			long duration, TimeUnit timeUnit) {
-		this.powerManager = powerManager;
-		this.scheduler = scheduler;
-		this.levelAndFlags = levelAndFlags;
-		this.tag = tag;
-		durationMs = MILLISECONDS.convert(duration, timeUnit);
-		renewTask = this::renew;
-	}
-
-	public void acquire() {
-		if (LOG.isLoggable(INFO)) LOG.info("Acquiring wake lock " + tag);
-		synchronized (lock) {
-			if (wakeLock != null) {
-				LOG.info("Already acquired");
-				return;
-			}
-			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
-			wakeLock.setReferenceCounted(false);
-			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
-			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
-		}
-	}
-
-	private void renew() {
-		if (LOG.isLoggable(INFO)) LOG.info("Renewing wake lock " + tag);
-		synchronized (lock) {
-			if (wakeLock == null) {
-				LOG.info("Already released");
-				return;
-			}
-			PowerManager.WakeLock oldWakeLock = wakeLock;
-			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
-			wakeLock.setReferenceCounted(false);
-			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
-			oldWakeLock.release();
-			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
-		}
-	}
-
-	public void release() {
-		if (LOG.isLoggable(INFO)) LOG.info("Releasing wake lock " + tag);
-		synchronized (lock) {
-			if (wakeLock == null) {
-				LOG.info("Already released");
-				return;
-			}
-			if (future == null) throw new AssertionError();
-			future.cancel(false);
-			future = null;
-			wakeLock.release();
-			wakeLock = null;
-		}
-	}
-}
-

bramble-android/src/main/res/raw/bridges

@@ -1,8 +0,0 @@
-Bridge 131.252.210.150:8081 0E858AC201BF0F3FA3C462F64844CBFFC7297A42
-Bridge 67.205.189.122:8443 12D64D5D44E20169585E7378580C0D33A872AD98
-Bridge 45.32.148.146:8443 0CE016FB2462D8BF179AE71F7D702D09DEAC3F1D
-Bridge 148.251.90.59:7510 019F727CA6DCA6CA5C90B55E477B7D87981E75BC
-Bridge 195.91.239.8:9001 BA83F62551545655BBEBBFF353A45438D73FD45A
-Bridge 185.165.184.217:6429 64CC94BEC51254E4409AD059192833854CCB95F0
-Bridge 45.55.1.74:8443 6F18FEFBB0CAECD5ABA755312FCCB34FC11A7AB8
-Bridge 95.85.40.163:9001 40057BE9CF76B6C5BDBE713753468BE0A990DE9C

bramble-api/build.gradle

@@ -2,7 +2,6 @@ apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
-apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'witness'
 
 dependencies {
@@ -15,8 +14,6 @@ dependencies {
 	testImplementation "org.jmock:jmock-legacy:2.8.2"
 	testImplementation "org.hamcrest:hamcrest-library:1.3"
 	testImplementation "org.hamcrest:hamcrest-core:1.3"
-
-	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
 
 dependencyVerification {
@@ -29,9 +26,6 @@ dependencyVerification {
 			'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
 			'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
 			'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
-			'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
-			'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
-			'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
 			'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.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
@@ -39,7 +33,6 @@ dependencyVerification {
 			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
 			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
 			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
-			'org.ow2.asm:asm-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
 			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
 	]
 }
@@ -55,3 +48,8 @@ task jarTest(type: Jar, dependsOn: testClasses) {
 artifacts {
 	testOutput jarTest
 }
+
+// If a Java 6 JRE is available, check we're not using any Java 7 or 8 APIs
+tasks.withType(JavaCompile) {
+	useJava6StandardLibrary(it)
+}

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

@@ -45,9 +45,9 @@ public interface ContactManager {
 	 *
 	 * @param alice true if the local party is Alice
 	 */
-	ContactId addContact(Author remote, AuthorId local, SecretKey master,
+	ContactId addContact(Author remote, AuthorId local,
-			long timestamp, boolean alice, boolean verified, boolean active)
+			SecretKey master, long timestamp, boolean alice, boolean verified,
-			throws DbException;
+			boolean active) throws DbException;
 
 	/**
 	 * Returns the contact with the given ID.

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

@@ -5,7 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
 
 /**
- * A key pair consisting of a {@link PublicKey} and a {@link PrivateKey}.
+ * A key pair consisting of a {@link PublicKey} and a {@link PrivateKey).
  */
 @Immutable
 @NotNullByDefault

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

@@ -8,7 +8,6 @@ import java.io.IOException;
 public interface BdfReader {
 
 	int DEFAULT_NESTED_LIMIT = 5;
-	int DEFAULT_MAX_BUFFER_SIZE = 64 * 1024;
 
 	boolean eof() throws IOException;
 
@@ -40,13 +39,13 @@ public interface BdfReader {
 
 	boolean hasString() throws IOException;
 
-	String readString() throws IOException;
+	String readString(int maxLength) throws IOException;
 
 	void skipString() throws IOException;
 
 	boolean hasRaw() throws IOException;
 
-	byte[] readRaw() throws IOException;
+	byte[] readRaw(int maxLength) throws IOException;
 
 	void skipRaw() throws IOException;
 

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

@@ -9,6 +9,5 @@ public interface BdfReaderFactory {
 
 	BdfReader createReader(InputStream in);
 
-	BdfReader createReader(InputStream in, int nestedLimit,
+	BdfReader createReader(InputStream in, int nestedLimit);
-			int maxBufferSize);
 }

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

@@ -104,12 +104,18 @@ public interface DatabaseComponent {
 			throws DbException;
 
 	/**
-	 * Stores the given transport keys for the given contact and returns a
+	 * Stores the given transport keys, optionally binding them to the given
-	 * key set ID.
+	 * contact, and returns a key set ID.
 	 */
-	KeySetId addTransportKeys(Transaction txn, ContactId c,
+	KeySetId addTransportKeys(Transaction txn, @Nullable ContactId c,
 			TransportKeys k) throws DbException;
 
+	/**
+	 * Binds the given keys for the given transport to the given contact.
+	 */
+	void bindTransportKeys(Transaction txn, ContactId c, TransportId t,
+			KeySetId k) throws DbException;
+
 	/**
 	 * Returns true if the database contains the given contact for the given
 	 * local pseudonym.

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

@@ -14,8 +14,6 @@ public interface DatabaseConfig {
 
 	File getDatabaseDirectory();
 
-	File getDatabaseKeyDirectory();
-
 	void setEncryptionKey(SecretKey key);
 
 	@Nullable

bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/IoExecutor.java

@@ -12,7 +12,7 @@ import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
 /**
  * Annotation for injecting the executor for long-running IO tasks. Also used
- * for annotating methods that should run on the IO executor.
+ * for annotating methods that should run on the UI executor.
  * <p>
  * The contract of this executor is that tasks may be run concurrently, and
  * submitting a task will never block. Tasks may run indefinitely. Tasks

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

@@ -1,6 +0,0 @@
-package org.briarproject.bramble.api.plugin;
-
-public interface FileConstants {
-
-	String PROP_PATH = "path";
-}

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

@@ -2,9 +2,8 @@ package org.briarproject.bramble.api.plugin;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.properties.TransportProperties;
 
-import java.util.Map;
+import java.util.Collection;
 
 @NotNullByDefault
 public interface Plugin {
@@ -40,19 +39,21 @@ public interface Plugin {
 	boolean isRunning();
 
 	/**
-	 * Returns true if the plugin should be polled periodically to attempt to
+	 * Returns true if the plugin's {@link #poll(Collection)} method should be
-	 * establish connections.
+	 * called periodically to attempt to establish connections.
 	 */
 	boolean shouldPoll();
 
 	/**
-	 * Returns the desired interval in milliseconds between polling attempts.
+	 * Returns the desired interval in milliseconds between calls to the
+	 * plugin's {@link #poll(Collection)} method.
 	 */
 	int getPollingInterval();
 
 	/**
-	 * Attempts to establish connections to the given contacts, passing any
+	 * Attempts to establish connections to contacts, passing any created
-	 * created connections to the callback.
+	 * connections to the callback. To avoid creating redundant connections,
+	 * the plugin may exclude the given contacts from polling.
 	 */
-	void poll(Map<ContactId, TransportProperties> contacts);
+	void poll(Collection<ContactId> connected);
 }

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

@@ -1,9 +1,12 @@
 package org.briarproject.bramble.api.plugin;
 
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
 
+import java.util.Map;
+
 /**
  * An interface through which a transport plugin interacts with the rest of
  * the application.
@@ -22,7 +25,17 @@ public interface PluginCallback {
 	TransportProperties getLocalProperties();
 
 	/**
-	 * Merges the given settings with the plugin's settings
+	 * Returns the plugin's remote transport properties.
+	 */
+	Map<ContactId, TransportProperties> getRemoteProperties();
+
+	/**
+	 * Returns the plugin's remote transport properties for the given contact.
+	 */
+	TransportProperties getRemoteProperties(ContactId c);
+
+	/**
+	 * Merges the given settings with the namespaced settings
 	 */
 	void mergeSettings(Settings s);
 
@@ -32,12 +45,34 @@ public interface PluginCallback {
 	void mergeLocalProperties(TransportProperties p);
 
 	/**
-	 * Signals that the transport is enabled.
+	 * Presents the user with a choice among two or more named options and
+	 * returns the user's response. The message may consist of a translatable
+	 * format string and arguments.
+	 *
+	 * @return an index into the array of options indicating the user's choice,
+	 * or -1 if the user cancelled the choice.
+	 */
+	int showChoice(String[] options, String... message);
+
+	/**
+	 * Asks the user to confirm an action and returns the user's response. The
+	 * message may consist of a translatable format string and arguments.
+	 */
+	boolean showConfirmationMessage(String... message);
+
+	/**
+	 * Shows a message to the user. The message may consist of a translatable
+	 * format string and arguments.
+	 */
+	void showMessage(String... message);
+
+	/**
+	 * Signal that the transport got enabled.
 	 */
 	void transportEnabled();
 
 	/**
-	 * Signals that the transport is disabled.
+	 * Signal that the transport got disabled.
 	 */
 	void transportDisabled();
 }

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

@@ -12,6 +12,4 @@ public interface PluginConfig {
 	Collection<DuplexPluginFactory> getDuplexFactories();
 
 	Collection<SimplexPluginFactory> getSimplexFactories();
-
-	boolean shouldPoll();
 }

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

@@ -22,6 +22,11 @@ public interface TransportConnectionWriter {
 	 */
 	int getMaxIdleTime();
 
+	/**
+	 * Returns the capacity of the transport connection in bytes.
+	 */
+	long getCapacity();
+
 	/**
 	 * Returns an output stream for writing to the transport connection.
 	 */

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

@@ -71,6 +71,11 @@ public abstract class AbstractDuplexTransportConnection
 			return plugin.getMaxIdleTime();
 		}
 
+		@Override
+		public long getCapacity() {
+			return Long.MAX_VALUE;
+		}
+
 		@Override
 		public OutputStream getOutputStream() throws IOException {
 			return AbstractDuplexTransportConnection.this.getOutputStream();

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

@@ -1,10 +1,10 @@
 package org.briarproject.bramble.api.plugin.duplex;
 
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Plugin;
-import org.briarproject.bramble.api.properties.TransportProperties;
 
 import javax.annotation.Nullable;
 
@@ -15,11 +15,12 @@ import javax.annotation.Nullable;
 public interface DuplexPlugin extends Plugin {
 
 	/**
-	 * Attempts to create and return a connection using the given transport
+	 * Attempts to create and return a connection to the given contact using
-	 * properties. Returns null if a connection cannot be created.
+	 * the current transport and configuration properties. Returns null if a
+	 * connection cannot be created.
 	 */
 	@Nullable
-	DuplexTransportConnection createConnection(TransportProperties p);
+	DuplexTransportConnection createConnection(ContactId c);
 
 	/**
 	 * Returns true if the plugin supports short-range key agreement.

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

@@ -5,8 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 
 /**
- * An interface through which a duplex plugin interacts with the rest of the
+ * An interface for handling connections created by a duplex transport plugin.
- * application.
  */
 @NotNullByDefault
 public interface DuplexPluginCallback extends PluginCallback {

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/simplex/SimplexPlugin.java

@@ -1,10 +1,10 @@
 package org.briarproject.bramble.api.plugin.simplex;
 
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.properties.TransportProperties;
 
 import javax.annotation.Nullable;
 
@@ -15,16 +15,18 @@ import javax.annotation.Nullable;
 public interface SimplexPlugin extends Plugin {
 
 	/**
-	 * Attempts to create and return a reader for the given transport
+	 * Attempts to create and return a reader for the given contact using the
-	 * properties. Returns null if a reader cannot be created.
+	 * current transport and configuration properties. Returns null if a reader
+	 * cannot be created.
 	 */
 	@Nullable
-	TransportConnectionReader createReader(TransportProperties p);
+	TransportConnectionReader createReader(ContactId c);
 
 	/**
-	 * Attempts to create and return a writer for the given transport
+	 * Attempts to create and return a writer for the given contact using the
-	 * properties. Returns null if a writer cannot be created.
+	 * current transport and configuration properties. Returns null if a writer
+	 * cannot be created.
 	 */
 	@Nullable
-	TransportConnectionWriter createWriter(TransportProperties p);
+	TransportConnectionWriter createWriter(ContactId c);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/simplex/SimplexPluginCallback.java

@@ -7,8 +7,8 @@ import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
 
 /**
- * An interface through which a simplex plugin interacts with the rest of the
+ * An interface for handling readers and writers created by a simplex transport
- * application.
+ * plugin.
  */
 @NotNullByDefault
 public interface SimplexPluginCallback extends PluginCallback {

bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevConfig.java

@@ -3,14 +3,10 @@ package org.briarproject.bramble.api.reporting;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
-import java.io.File;
-
 @NotNullByDefault
 public interface DevConfig {
 
 	PublicKey getDevPublicKey();
 
 	String getDevOnionAddress();
-
-	File getReportDir();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevReporter.java

@@ -23,6 +23,8 @@ public interface DevReporter {
 
 	/**
 	 * Sends any reports previously stored on disk.
+	 *
+	 * @param reportDir the directory where reports are stored.
 	 */
-	void sendReports();
+	void sendReports(File reportDir);
 }

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

@@ -2,9 +2,9 @@ package org.briarproject.bramble.api.sync;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.InputStream;
+import java.io.OutputStream;
 
 @NotNullByDefault
 public interface SyncSessionFactory {
@@ -12,8 +12,8 @@ public interface SyncSessionFactory {
 	SyncSession createIncomingSession(ContactId c, InputStream in);
 
 	SyncSession createSimplexOutgoingSession(ContactId c, int maxLatency,
-			StreamWriter streamWriter);
+			OutputStream out);
 
 	SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxIdleTime, StreamWriter streamWriter);
+			int maxIdleTime, OutputStream out);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/system/Clock.java

@@ -7,12 +7,12 @@ package org.briarproject.bramble.api.system;
 public interface Clock {
 
 	/**
-	 * @see System#currentTimeMillis()
+	 * @see {@link System#currentTimeMillis()}
 	 */
 	long currentTimeMillis();
 
 	/**
-	 * @see Thread#sleep(long)
+	 * @see {@link Thread#sleep(long)}
 	 */
 	void sleep(long milliseconds) throws InterruptedException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeyManager.java

@@ -19,24 +19,48 @@ public interface KeyManager {
 	/**
 	 * Informs the key manager that a new contact has been added. Derives and
 	 * stores a set of transport keys for communicating with the contact over
-	 * each transport and returns the key set IDs.
+	 * each transport.
 	 * <p/>
 	 * {@link StreamContext StreamContexts} for the contact can be created
 	 * after this method has returned.
 	 *
 	 * @param alice true if the local party is Alice
-	 * @param active whether the derived keys can be used for outgoing streams
 	 */
-	Map<TransportId, KeySetId> addContact(Transaction txn, ContactId c,
+	void addContact(Transaction txn, ContactId c, SecretKey master,
-			SecretKey master, long timestamp, boolean alice, boolean active)
+			long timestamp, boolean alice) throws DbException;
+
+	/**
+	 * Derives and stores a set of unbound transport keys for each transport
+	 * and returns the key set IDs.
+	 * <p/>
+	 * The keys must be bound before they can be used for incoming streams,
+	 * and also activated before they can be used for outgoing streams.
+	 *
+	 * @param alice true if the local party is Alice
+	 */
+	Map<TransportId, KeySetId> addUnboundKeys(Transaction txn, SecretKey master,
+			long timestamp, boolean alice) throws DbException;
+
+	/**
+	 * Binds the given transport keys to the given contact.
+	 */
+	void bindKeys(Transaction txn, ContactId c, Map<TransportId, KeySetId> keys)
 			throws DbException;
 
 	/**
-	 * Marks the given transport keys as usable for outgoing streams.
+	 * Marks the given transport keys as usable for outgoing streams. Keys must
+	 * be bound before they are activated.
 	 */
 	void activateKeys(Transaction txn, Map<TransportId, KeySetId> keys)
 			throws DbException;
 
+	/**
+	 * Removes the given transport keys, which must not have been bound, from
+	 * the manager and the database.
+	 */
+	void removeKeys(Transaction txn, Map<TransportId, KeySetId> keys)
+			throws DbException;
+
 	/**
 	 * Returns true if we have keys that can be used for outgoing streams to
 	 * the given contact over the given transport.

bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeySet.java

@@ -3,20 +3,23 @@ package org.briarproject.bramble.api.transport;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
 
 /**
- * A set of transport keys for communicating with a contact.
+ * A set of transport keys for communicating with a contact. If the keys have
+ * not yet been bound to a contact, {@link #getContactId()}} returns null.
  */
 @Immutable
 @NotNullByDefault
 public class KeySet {
 
 	private final KeySetId keySetId;
+	@Nullable
 	private final ContactId contactId;
 	private final TransportKeys transportKeys;
 
-	public KeySet(KeySetId keySetId, ContactId contactId,
+	public KeySet(KeySetId keySetId, @Nullable ContactId contactId,
 			TransportKeys transportKeys) {
 		this.keySetId = keySetId;
 		this.contactId = contactId;
@@ -27,6 +30,7 @@ public class KeySet {
 		return keySetId;
 	}
 
+	@Nullable
 	public ContactId getContactId() {
 		return contactId;
 	}

bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriter.java

@@ -1,19 +0,0 @@
-package org.briarproject.bramble.api.transport;
-
-import java.io.IOException;
-import java.io.OutputStream;
-
-/**
- * An interface for writing data to a transport connection. Data will be
- * encrypted and authenticated before being written to the connection.
- */
-public interface StreamWriter {
-
-	OutputStream getOutputStream();
-
-	/**
-	 * Sends the end of stream marker, informing the recipient that no more
-	 * data will be sent. The connection is flushed but not closed.
-	 */
-	void sendEndOfStream() throws IOException;
-}

bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriterFactory.java

@@ -12,12 +12,12 @@ public interface StreamWriterFactory {
 	 * Creates an {@link OutputStream OutputStream} for writing to a
 	 * transport stream
 	 */
-	StreamWriter createStreamWriter(OutputStream out, StreamContext ctx);
+	OutputStream createStreamWriter(OutputStream out, StreamContext ctx);
 
 	/**
 	 * Creates an {@link OutputStream OutputStream} for writing to a contact
 	 * exchange stream.
 	 */
-	StreamWriter createContactExchangeStreamWriter(OutputStream out,
+	OutputStream createContactExchangeStreamWriter(OutputStream out,
 			SecretKey headerKey);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/ui/UiCallback.java

@@ -0,0 +1,26 @@
+package org.briarproject.bramble.api.ui;
+
+public interface UiCallback {
+
+	/**
+	 * Presents the user with a choice among two or more named options and
+	 * returns the user's response. The message may consist of a translatable
+	 * format string and arguments.
+	 *
+	 * @return an index into the array of options indicating the user's choice,
+	 * or -1 if the user cancelled the choice.
+	 */
+	int showChoice(String[] options, String... message);
+
+	/**
+	 * Asks the user to confirm an action and returns the user's response. The
+	 * message may consist of a translatable format string and arguments.
+	 */
+	boolean showConfirmationMessage(String... message);
+
+	/**
+	 * Shows a message to the user. The message may consist of a translatable
+	 * format string and arguments.
+	 */
+	void showMessage(String... message);
+}

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

@@ -9,40 +9,25 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.Socket;
-import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
-import static java.util.logging.Level.WARNING;
-
 @NotNullByDefault
 public class IoUtils {
 
-	private static final Logger LOG = Logger.getLogger(IoUtils.class.getName());
-
 	public static void deleteFileOrDir(File f) {
 		if (f.isFile()) {
-			delete(f);
+			f.delete();
 		} else if (f.isDirectory()) {
 			File[] children = f.listFiles();
-			if (children == null) {
+			if (children != null)
-				if (LOG.isLoggable(WARNING)) {
-					LOG.warning("Could not list files in "
-							+ f.getAbsolutePath());
-				}
-			} else {
 				for (File child : children) deleteFileOrDir(child);
-			}
+			f.delete();
-			delete(f);
 		}
 	}
 
-	private static void delete(File f) {
+	public static void copyAndClose(InputStream in, OutputStream out)
-		if (!f.delete() && LOG.isLoggable(WARNING))
+			throws IOException {
-			LOG.warning("Could not delete " + f.getAbsolutePath());
-	}
-
-	public static void copyAndClose(InputStream in, OutputStream out) {
 		byte[] buf = new byte[4096];
 		try {
 			while (true) {

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

@@ -1,36 +0,0 @@
-package org.briarproject.bramble.util;
-
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-import static java.util.logging.Level.FINE;
-
-public class LogUtils {
-
-	private static final int NANOS_PER_MILLI = 1000 * 1000;
-
-	/**
-	 * Returns the elapsed time in milliseconds since some arbitrary
-	 * starting time. This is only useful for measuring elapsed time.
-	 */
-	public static long now() {
-		return System.nanoTime() / NANOS_PER_MILLI;
-	}
-
-	/**
-	 * Logs the duration of a task.
-	 * @param logger the logger to use
-	 * @param task a description of the task
-	 * @param start the start time of the task, as returned by {@link #now()}
-	 */
-	public static void logDuration(Logger logger, String task, long start) {
-		if (logger.isLoggable(FINE)) {
-			long duration = now() - start;
-			logger.fine(task + " took " + duration + " ms");
-		}
-	}
-
-	public static void logException(Logger logger, Level level, Throwable t) {
-		if (logger.isLoggable(level)) logger.log(level, t.toString(), t);
-	}
-}

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

@@ -22,6 +22,19 @@ public class OsUtils {
 		return os != null && os.contains("Mac OS");
 	}
 
+	public static boolean isMacLeopardOrNewer() {
+		if (!isMac() || version == null) return false;
+		try {
+			String[] v = version.split("\\.");
+			if (v.length != 3) return false;
+			int major = Integer.parseInt(v[0]);
+			int minor = Integer.parseInt(v[1]);
+			return major >= 10 && minor >= 5;
+		} catch (NumberFormatException e) {
+			return false;
+		}
+	}
+
 	public static boolean isLinux() {
 		return os != null && os.contains("Linux") && !isAndroid();
 	}

bramble-core/build.gradle

@@ -2,7 +2,6 @@ apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
-apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'net.ltgt.apt'
 apply plugin: 'idea'
 apply plugin: 'witness'
@@ -27,8 +26,6 @@ dependencies {
 	testImplementation "org.hamcrest:hamcrest-core:1.3"
 
 	testApt 'com.google.dagger:dagger-compiler:2.0.2'
-
-	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
 
 dependencyVerification {
@@ -47,9 +44,6 @@ dependencyVerification {
 			'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
 			'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
 			'org.bitlet:weupnp:0.1.4:weupnp-0.1.4.jar:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
-			'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
-			'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
-			'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
 			'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.hsqldb:hsqldb:2.3.5:hsqldb-2.3.5.jar:6676a6977ac98997a80f827ddbd3fe8ca1e0853dad1492512135fd1a222ccfad',
@@ -58,7 +52,6 @@ dependencyVerification {
 			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
 			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
 			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
-			'org.ow2.asm:asm-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
 			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
 			'org.whispersystems:curve25519-java:0.4.1:curve25519-java-0.4.1.jar:7dd659d8822c06c3aea1a47f18fac9e5761e29cab8100030b877db445005f03e',
 	]
@@ -75,3 +68,8 @@ task jarTest(type: Jar, dependsOn: testClasses) {
 artifacts {
 	testOutput jarTest
 }
+
+// If a Java 6 JRE is available, check we're not using any Java 7 or 8 APIs
+tasks.withType(JavaCompile) {
+	useJava6StandardLibrary(it)
+}

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

@@ -7,7 +7,6 @@ import org.briarproject.bramble.identity.IdentityModule;
 import org.briarproject.bramble.lifecycle.LifecycleModule;
 import org.briarproject.bramble.plugin.PluginModule;
 import org.briarproject.bramble.properties.PropertiesModule;
-import org.briarproject.bramble.reporting.ReportingModule;
 import org.briarproject.bramble.sync.SyncModule;
 import org.briarproject.bramble.system.SystemModule;
 import org.briarproject.bramble.transport.TransportModule;
@@ -29,8 +28,6 @@ public interface BrambleCoreEagerSingletons {
 
 	void inject(PropertiesModule.EagerSingletons init);
 
-	void inject(ReportingModule.EagerSingletons init);
-
 	void inject(SyncModule.EagerSingletons init);
 
 	void inject(SystemModule.EagerSingletons init);

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

@@ -59,7 +59,6 @@ public class BrambleCoreModule {
 		c.inject(new LifecycleModule.EagerSingletons());
 		c.inject(new PluginModule.EagerSingletons());
 		c.inject(new PropertiesModule.EagerSingletons());
-		c.inject(new ReportingModule.EagerSingletons());
 		c.inject(new SyncModule.EagerSingletons());
 		c.inject(new SystemModule.EagerSingletons());
 		c.inject(new TransportModule.EagerSingletons());

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

@@ -5,12 +5,12 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.util.LinkedList;
 import java.util.Queue;
 import java.util.concurrent.Executor;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.GuardedBy;
 
 import static java.util.logging.Level.FINE;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 /**
  * An {@link Executor} that delegates its tasks to another {@link Executor}
@@ -20,6 +20,8 @@ import static org.briarproject.bramble.util.LogUtils.now;
 @NotNullByDefault
 public class PoliteExecutor implements Executor {
 
+	private static final Level LOG_LEVEL = FINE;
+
 	private final Object lock = new Object();
 	@GuardedBy("lock")
 	private final Queue<Runnable> queue = new LinkedList<>();
@@ -47,11 +49,11 @@ public class PoliteExecutor implements Executor {
 
 	@Override
 	public void execute(Runnable r) {
-		long submitted = now();
+		long submitted = System.currentTimeMillis();
 		Runnable wrapped = () -> {
-			if (log.isLoggable(FINE)) {
+			if (log.isLoggable(LOG_LEVEL)) {
-				long queued = now() - submitted;
+				long queued = System.currentTimeMillis() - submitted;
-				log.fine("Queue time " + queued + " ms");
+				log.log(LOG_LEVEL, "Queue time " + queued + " ms");
 			}
 			try {
 				r.run();

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

@@ -6,14 +6,16 @@ import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.FINE;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
 public class TimeLoggingExecutor extends ThreadPoolExecutor {
 
+	private static final Level LOG_LEVEL = FINE;
+
 	private final Logger log;
 
 	public TimeLoggingExecutor(String tag, int corePoolSize, int maxPoolSize,
@@ -27,15 +29,15 @@ public class TimeLoggingExecutor extends ThreadPoolExecutor {
 
 	@Override
 	public void execute(Runnable r) {
-		if (log.isLoggable(FINE)) {
+		if (log.isLoggable(LOG_LEVEL)) {
-			long submitted = now();
+			long submitted = System.currentTimeMillis();
 			super.execute(() -> {
-				long started = now();
+				long started = System.currentTimeMillis();
 				long queued = started - submitted;
-				log.fine("Queue time " + queued + " ms");
+				log.log(LOG_LEVEL, "Queue time " + queued + " ms");
 				r.run();
-				long executing = now() - started;
+				long executing = System.currentTimeMillis() - started;
-				log.fine("Execution time " + executing + " ms");
+				log.log(LOG_LEVEL, "Execution time " + executing + " ms");
 			});
 		} else {
 			super.execute(r);

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

@@ -30,7 +30,6 @@ import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.record.RecordWriterFactory;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.EOFException;
@@ -46,7 +45,6 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 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;
 import static org.briarproject.bramble.util.ValidationUtils.checkLength;
 import static org.briarproject.bramble.util.ValidationUtils.checkSize;
 
@@ -123,7 +121,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			in = conn.getReader().getInputStream();
 			out = conn.getWriter().getOutputStream();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -134,7 +132,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 		try {
 			localProperties = transportPropertyManager.getLocalProperties();
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -154,11 +152,11 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 				recordReaderFactory.createRecordReader(streamReader);
 
 		// Create the writers
-		StreamWriter streamWriter =
+		OutputStream streamWriter =
 				streamWriterFactory.createContactExchangeStreamWriter(out,
 						alice ? aliceHeaderKey : bobHeaderKey);
 		RecordWriter recordWriter =
-				recordWriterFactory.createRecordWriter(streamWriter.getOutputStream());
+				recordWriterFactory.createRecordWriter(streamWriter);
 
 		// Derive the nonces to be signed
 		byte[] aliceNonce = crypto.mac(ALICE_NONCE_LABEL, masterSecret,
@@ -186,8 +184,8 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 						localSignature, localTimestamp);
 				recordWriter.flush();
 			}
-			// Send EOF on the outgoing stream
+			// Close the outgoing stream
-			streamWriter.sendEndOfStream();
+			recordWriter.close();
 			// Skip any remaining records from the incoming stream
 			try {
 				while (true) recordReader.readRecord();
@@ -195,7 +193,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 				LOG.info("End of stream");
 			}
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -223,11 +221,11 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			LOG.info("Pseudonym exchange succeeded");
 			listener.contactExchangeSucceeded(remoteInfo.author);
 		} catch (ContactExistsException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			tryToClose(conn);
 			listener.duplicateContact(remoteInfo.author);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			tryToClose(conn);
 			listener.contactExchangeFailed();
 		}
@@ -308,7 +306,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			conn.getReader().dispose(true, true);
 			conn.getWriter().dispose(true);
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 

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

@@ -46,7 +46,7 @@ class ContactManagerImpl implements ContactManager {
 			SecretKey master, long timestamp, boolean alice, boolean verified,
 			boolean active) throws DbException {
 		ContactId c = db.addContact(txn, remote, local, verified, active);
-		keyManager.addContact(txn, c, master, timestamp, alice, active);
+		keyManager.addContact(txn, c, master, timestamp, alice);
 		Contact contact = db.getContact(txn, c);
 		for (ContactHook hook : hooks) hook.addingContact(txn, contact);
 		return c;

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

@@ -32,8 +32,6 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
-import static org.briarproject.bramble.util.LogUtils.logDuration;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
 class CryptoComponentImpl implements CryptoComponent {
@@ -129,14 +127,16 @@ class CryptoComponentImpl implements CryptoComponent {
 			throw new IllegalArgumentException();
 		if (!(pub instanceof Curve25519PublicKey))
 			throw new IllegalArgumentException();
-		long start = now();
+		long now = System.currentTimeMillis();
 		byte[] secret = curve25519.calculateAgreement(pub.getEncoded(),
 				priv.getEncoded());
 		// If the shared secret is all zeroes, the public key is invalid
 		byte allZero = 0;
 		for (byte b : secret) allZero |= b;
 		if (allZero == 0) throw new GeneralSecurityException();
-		logDuration(LOG, "Deriving shared secret", start);
+		long duration = System.currentTimeMillis() - now;
+		if (LOG.isLoggable(INFO))
+			LOG.info("Deriving shared secret took " + duration + " ms");
 		return secret;
 	}
 

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

@@ -152,47 +152,59 @@ public class MessageEncrypter {
 		}
 	}
 
-	public static void main(String[] args) {
+	public static void main(String[] args) throws Exception {
 		if (args.length < 1) {
 			printUsage();
-			System.exit(1);
+			return;
 		}
+		SecureRandom random = new SecureRandom();
+		MessageEncrypter encrypter = new MessageEncrypter(random);
 		if (args[0].equals("generate")) {
 			if (args.length != 3) {
 				printUsage();
-				System.exit(1);
+				return;
-			}
-			try {
-				generateKeyPair(args[1], args[2]);
-			} catch (Exception e) {
-				e.printStackTrace();
-				System.exit(2);
 			}
+			// Generate a key pair
+			KeyPair keyPair = encrypter.generateKeyPair();
+			PrintStream out = new PrintStream(new FileOutputStream(args[1]));
+			out.print(
+					StringUtils.toHexString(keyPair.getPublic().getEncoded()));
+			out.flush();
+			out.close();
+			out = new PrintStream(new FileOutputStream(args[2]));
+			out.print(
+					StringUtils.toHexString(keyPair.getPrivate().getEncoded()));
+			out.flush();
+			out.close();
 		} else if (args[0].equals("encrypt")) {
 			if (args.length != 2) {
 				printUsage();
-				System.exit(1);
+				return;
-			}
-			try {
-				encryptMessage(args[1]);
-			} catch (Exception e) {
-				e.printStackTrace();
-				System.exit(2);
 			}
+			// Encrypt a decrypted message
+			InputStream in = new FileInputStream(args[1]);
+			byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
+			PublicKey publicKey =
+					encrypter.getKeyParser().parsePublicKey(keyBytes);
+			String message = readFully(System.in);
+			byte[] plaintext = message.getBytes(Charset.forName("UTF-8"));
+			byte[] ciphertext = encrypter.encrypt(publicKey, plaintext);
+			System.out.println(AsciiArmour.wrap(ciphertext, LINE_LENGTH));
 		} else if (args[0].equals("decrypt")) {
 			if (args.length != 2) {
 				printUsage();
-				System.exit(1);
+				return;
-			}
-			try {
-				decryptMessage(args[1]);
-			} catch (Exception e) {
-				e.printStackTrace();
-				System.exit(2);
 			}
+			// Decrypt an encrypted message
+			InputStream in = new FileInputStream(args[1]);
+			byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
+			PrivateKey privateKey =
+					encrypter.getKeyParser().parsePrivateKey(keyBytes);
+			byte[] ciphertext = AsciiArmour.unwrap(readFully(System.in));
+			byte[] plaintext = encrypter.decrypt(privateKey, ciphertext);
+			System.out.println(new String(plaintext, Charset.forName("UTF-8")));
 		} else {
 			printUsage();
-			System.exit(1);
 		}
 	}
 
@@ -204,46 +216,6 @@ public class MessageEncrypter {
 		System.err.println("MessageEncrypter decrypt <private_key_file>");
 	}
 
-	private static void generateKeyPair(String publicKeyFile,
-			String privateKeyFile) throws Exception {
-		SecureRandom random = new SecureRandom();
-		MessageEncrypter encrypter = new MessageEncrypter(random);
-		KeyPair keyPair = encrypter.generateKeyPair();
-		PrintStream out = new PrintStream(new FileOutputStream(publicKeyFile));
-		out.print(StringUtils.toHexString(keyPair.getPublic().getEncoded()));
-		out.flush();
-		out.close();
-		out = new PrintStream(new FileOutputStream(privateKeyFile));
-		out.print(StringUtils.toHexString(keyPair.getPrivate().getEncoded()));
-		out.flush();
-		out.close();
-	}
-
-	private static void encryptMessage(String publicKeyFile) throws Exception {
-		SecureRandom random = new SecureRandom();
-		MessageEncrypter encrypter = new MessageEncrypter(random);
-		InputStream in = new FileInputStream(publicKeyFile);
-		byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
-		PublicKey publicKey =
-				encrypter.getKeyParser().parsePublicKey(keyBytes);
-		String message = readFully(System.in);
-		byte[] plaintext = message.getBytes(Charset.forName("UTF-8"));
-		byte[] ciphertext = encrypter.encrypt(publicKey, plaintext);
-		System.out.println(AsciiArmour.wrap(ciphertext, LINE_LENGTH));
-	}
-
-	private static void decryptMessage(String privateKeyFile) throws Exception {
-		SecureRandom random = new SecureRandom();
-		MessageEncrypter encrypter = new MessageEncrypter(random);
-		InputStream in = new FileInputStream(privateKeyFile);
-		byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
-		PrivateKey privateKey =
-				encrypter.getKeyParser().parsePrivateKey(keyBytes);
-		byte[] ciphertext = AsciiArmour.unwrap(readFully(System.in));
-		byte[] plaintext = encrypter.decrypt(privateKey, ciphertext);
-		System.out.println(new String(plaintext, Charset.forName("UTF-8")));
-	}
-
 	private static String readFully(InputStream in) throws IOException {
 		String newline = System.getProperty("line.separator");
 		StringBuilder stringBuilder = new StringBuilder();

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

@@ -10,8 +10,6 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
-import static org.briarproject.bramble.util.LogUtils.logDuration;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 class ScryptKdf implements PasswordBasedKdf {
 
@@ -52,11 +50,13 @@ class ScryptKdf implements PasswordBasedKdf {
 
 	@Override
 	public SecretKey deriveKey(String password, byte[] salt, int cost) {
-		long start = now();
+		long start = System.currentTimeMillis();
 		byte[] passwordBytes = StringUtils.toUtf8(password);
 		SecretKey k = new SecretKey(SCrypt.generate(passwordBytes, salt, cost,
 				BLOCK_SIZE, PARALLELIZATION, SecretKey.LENGTH));
-		logDuration(LOG, "Deriving key from password", start);
+		long duration = System.currentTimeMillis() - start;
+		if (LOG.isLoggable(INFO))
+			LOG.info("Deriving key from password took " + duration + " ms");
 		return k;
 	}
 }

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

@@ -16,8 +16,7 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
-import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static java.util.logging.Level.INFO;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 /**
  * A key parser that uses the encoding defined in "SEC 1: Elliptic Curve
@@ -49,7 +48,7 @@ class Sec1KeyParser implements KeyParser {
 			throws GeneralSecurityException {
 		// The validation procedure comes from SEC 1, section 3.2.2.1. Note
 		// that SEC 1 parameter names are used below, not RFC 5639 names
-		long start = now();
+		long now = System.currentTimeMillis();
 		if (encodedKey.length != publicKeyBytes)
 			throw new GeneralSecurityException();
 		// The first byte must be 0x04
@@ -81,14 +80,16 @@ class Sec1KeyParser implements KeyParser {
 		// Construct a public key from the point (x, y) and the params
 		ECPublicKeyParameters k = new ECPublicKeyParameters(pub, params);
 		PublicKey p = new Sec1PublicKey(k);
-		logDuration(LOG, "Parsing public key", start);
+		long duration = System.currentTimeMillis() - now;
+		if (LOG.isLoggable(INFO))
+			LOG.info("Parsing public key took " + duration + " ms");
 		return p;
 	}
 
 	@Override
 	public PrivateKey parsePrivateKey(byte[] encodedKey)
 			throws GeneralSecurityException {
-		long start = now();
+		long now = System.currentTimeMillis();
 		if (encodedKey.length != privateKeyBytes)
 			throw new GeneralSecurityException();
 		BigInteger d = new BigInteger(1, encodedKey); // Positive signum
@@ -98,7 +99,9 @@ class Sec1KeyParser implements KeyParser {
 		// Construct a private key from the private value and the params
 		ECPrivateKeyParameters k = new ECPrivateKeyParameters(d, params);
 		PrivateKey p = new Sec1PrivateKey(k, keyBits);
-		logDuration(LOG, "Parsing private key", start);
+		long duration = System.currentTimeMillis() - now;
+		if (LOG.isLoggable(INFO))
+			LOG.info("Parsing private key took " + duration + " ms");
 		return p;
 	}
 }

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

@@ -10,37 +10,37 @@ import java.security.GeneralSecurityException;
 interface Signature {
 
 	/**
-	 * @see java.security.Signature#initSign(java.security.PrivateKey)
+	 * @see {@link java.security.Signature#initSign(java.security.PrivateKey)}
 	 */
 	void initSign(PrivateKey k) throws GeneralSecurityException;
 
 	/**
-	 * @see java.security.Signature#initVerify(java.security.PublicKey)
+	 * @see {@link java.security.Signature#initVerify(java.security.PublicKey)}
 	 */
 	void initVerify(PublicKey k) throws GeneralSecurityException;
 
 	/**
-	 * @see java.security.Signature#update(byte)
+	 * @see {@link java.security.Signature#update(byte)}
 	 */
 	void update(byte b) throws GeneralSecurityException;
 
 	/**
-	 * @see java.security.Signature#update(byte[])
+	 * @see {@link java.security.Signature#update(byte[])}
 	 */
 	void update(byte[] b) throws GeneralSecurityException;
 
 	/**
-	 * @see java.security.Signature#update(byte[], int, int)
+	 * @see {@link java.security.Signature#update(byte[], int, int)}
 	 */
 	void update(byte[] b, int off, int len) throws GeneralSecurityException;
 
 	/**
-	 * @see java.security.Signature#sign()}
+	 * @see {@link java.security.Signature#sign()}
 	 */
 	byte[] sign() throws GeneralSecurityException;
 
 	/**
-	 * @see java.security.Signature#verify(byte[])
+	 * @see {@link java.security.Signature#verify(byte[])}
 	 */
 	boolean verify(byte[] signature) throws GeneralSecurityException;
 }

bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderFactoryImpl.java

@@ -8,7 +8,6 @@ import java.io.InputStream;
 
 import javax.annotation.concurrent.Immutable;
 
-import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_MAX_BUFFER_SIZE;
 import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_NESTED_LIMIT;
 
 @Immutable
@@ -17,13 +16,11 @@ class BdfReaderFactoryImpl implements BdfReaderFactory {
 
 	@Override
 	public BdfReader createReader(InputStream in) {
-		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
+		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT);
-				DEFAULT_MAX_BUFFER_SIZE);
 	}
 
 	@Override
-	public BdfReader createReader(InputStream in, int nestedLimit,
+	public BdfReader createReader(InputStream in, int nestedLimit) {
-			int maxBufferSize) {
+		return new BdfReaderImpl(in, nestedLimit);
-		return new BdfReaderImpl(in, nestedLimit, maxBufferSize);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderImpl.java

@@ -37,16 +37,15 @@ class BdfReaderImpl implements BdfReader {
 	private static final byte[] EMPTY_BUFFER = new byte[0];
 
 	private final InputStream in;
-	private final int nestedLimit, maxBufferSize;
+	private final int nestedLimit;
 
 	private boolean hasLookahead = false, eof = false;
 	private byte next;
 	private byte[] buf = new byte[8];
 
-	BdfReaderImpl(InputStream in, int nestedLimit, int maxBufferSize) {
+	BdfReaderImpl(InputStream in, int nestedLimit) {
 		this.in = in;
 		this.nestedLimit = nestedLimit;
-		this.maxBufferSize = maxBufferSize;
 	}
 
 	private void readLookahead() throws IOException {
@@ -92,8 +91,8 @@ class BdfReaderImpl implements BdfReader {
 		if (hasBoolean()) return readBoolean();
 		if (hasLong()) return readLong();
 		if (hasDouble()) return readDouble();
-		if (hasString()) return readString();
+		if (hasString()) return readString(Integer.MAX_VALUE);
-		if (hasRaw()) return readRaw();
+		if (hasRaw()) return readRaw(Integer.MAX_VALUE);
 		if (hasList()) return readList(level);
 		if (hasDictionary()) return readDictionary(level);
 		throw new FormatException();
@@ -246,11 +245,11 @@ class BdfReaderImpl implements BdfReader {
 	}
 
 	@Override
-	public String readString() throws IOException {
+	public String readString(int maxLength) throws IOException {
 		if (!hasString()) throw new FormatException();
 		hasLookahead = false;
 		int length = readStringLength();
-		if (length < 0 || length > maxBufferSize) throw new FormatException();
+		if (length < 0 || length > maxLength) throw new FormatException();
 		if (length == 0) return "";
 		readIntoBuffer(length);
 		return new String(buf, 0, length, "UTF-8");
@@ -280,11 +279,11 @@ class BdfReaderImpl implements BdfReader {
 	}
 
 	@Override
-	public byte[] readRaw() throws IOException {
+	public byte[] readRaw(int maxLength) throws IOException {
 		if (!hasRaw()) throw new FormatException();
 		hasLookahead = false;
 		int length = readRawLength();
-		if (length < 0 || length > maxBufferSize) throw new FormatException();
+		if (length < 0 || length > maxLength) throw new FormatException();
 		if (length == 0) return EMPTY_BUFFER;
 		byte[] b = new byte[length];
 		readIntoBuffer(b, length);
@@ -382,7 +381,7 @@ class BdfReaderImpl implements BdfReader {
 		BdfDictionary dictionary = new BdfDictionary();
 		readDictionaryStart();
 		while (!hasDictionaryEnd())
-			dictionary.put(readString(), readObject(level + 1));
+			dictionary.put(readString(Integer.MAX_VALUE), readObject(level + 1));
 		readDictionaryEnd();
 		return dictionary;
 	}

bramble-core/src/main/java/org/briarproject/bramble/data/MetadataParserImpl.java

@@ -59,8 +59,8 @@ class MetadataParserImpl implements MetadataParser {
 		if (reader.hasBoolean()) return reader.readBoolean();
 		if (reader.hasLong()) return reader.readLong();
 		if (reader.hasDouble()) return reader.readDouble();
-		if (reader.hasString()) return reader.readString();
+		if (reader.hasString()) return reader.readString(Integer.MAX_VALUE);
-		if (reader.hasRaw()) return reader.readRaw();
+		if (reader.hasRaw()) return reader.readRaw(Integer.MAX_VALUE);
 		if (reader.hasList()) return reader.readList();
 		if (reader.hasDictionary()) return reader.readDictionary();
 		throw new FormatException();

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

@@ -34,8 +34,8 @@ import javax.annotation.Nullable;
  * A low-level interface to the database (DatabaseComponent provides a
  * high-level interface). Most operations take a transaction argument, which is
  * obtained by calling {@link #startTransaction()}. Every transaction must be
- * terminated by calling either {@link #abortTransaction(Object) abortTransaction(T)} or
+ * terminated by calling either {@link #abortTransaction(T)} or
- * {@link #commitTransaction(Object) commitTransaction(T)}, even if an exception is thrown.
+ * {@link #commitTransaction(T)}, even if an exception is thrown.
  */
 @NotNullByDefault
 interface Database<T> {
@@ -125,10 +125,16 @@ interface Database<T> {
 			throws DbException;
 
 	/**
-	 * Stores the given transport keys for the given contact and returns a
+	 * Stores the given transport keys, optionally binding them to the given
-	 * key set ID.
+	 * contact, and returns a key set ID.
 	 */
-	KeySetId addTransportKeys(T txn, ContactId c, TransportKeys k)
+	KeySetId addTransportKeys(T txn, @Nullable ContactId c, TransportKeys k)
+			throws DbException;
+
+	/**
+	 * Binds the given keys for the given transport to the given contact.
+	 */
+	void bindTransportKeys(T txn, ContactId c, TransportId t, KeySetId k)
 			throws DbException;
 
 	/**

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

@@ -68,15 +68,13 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.WARNING;
 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.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
 import static org.briarproject.bramble.db.DatabaseConstants.MAX_OFFERED_MESSAGES;
-import static org.briarproject.bramble.util.LogUtils.logDuration;
-import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -110,7 +108,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 			try {
 				close();
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		});
 		return reopened;
@@ -127,13 +125,13 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		// Don't allow reentrant locking
 		if (lock.getReadHoldCount() > 0) throw new IllegalStateException();
 		if (lock.getWriteHoldCount() > 0) throw new IllegalStateException();
-		long start = now();
+		long start = System.currentTimeMillis();
-		if (readOnly) {
+		if (readOnly) lock.readLock().lock();
-			lock.readLock().lock();
+		else lock.writeLock().lock();
-			logDuration(LOG, "Waiting for read lock", start);
+		if (LOG.isLoggable(FINE)) {
-		} else {
+			long duration = System.currentTimeMillis() - start;
-			lock.writeLock().lock();
+			if (readOnly) LOG.fine("Waited " + duration + " ms for read lock");
-			logDuration(LOG, "Waiting for write lock", start);
+			else LOG.fine("Waited " + duration + " ms for write lock");
 		}
 		try {
 			return new Transaction(db.startTransaction(), readOnly);
@@ -236,17 +234,29 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 	}
 
 	@Override
-	public KeySetId addTransportKeys(Transaction transaction, ContactId c,
+	public KeySetId addTransportKeys(Transaction transaction,
-			TransportKeys k) throws DbException {
+			@Nullable ContactId c, TransportKeys k) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
-		if (!db.containsContact(txn, c))
+		if (c != null && !db.containsContact(txn, c))
 			throw new NoSuchContactException();
 		if (!db.containsTransport(txn, k.getTransportId()))
 			throw new NoSuchTransportException();
 		return db.addTransportKeys(txn, c, k);
 	}
 
+	@Override
+	public void bindTransportKeys(Transaction transaction, ContactId c,
+			TransportId t, KeySetId k) throws DbException {
+		if (transaction.isReadOnly()) throw new IllegalArgumentException();
+		T txn = unbox(transaction);
+		if (!db.containsContact(txn, c))
+			throw new NoSuchContactException();
+		if (!db.containsTransport(txn, t))
+			throw new NoSuchTransportException();
+		db.bindTransportKeys(txn, c, t, k);
+	}
+
 	@Override
 	public boolean containsContact(Transaction transaction, AuthorId remote,
 			AuthorId local) throws DbException {

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

@@ -53,7 +53,6 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 
 import static java.sql.Types.INTEGER;
-import static java.util.Collections.singletonList;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.db.Metadata.REMOVE;
@@ -66,7 +65,6 @@ import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
 import static org.briarproject.bramble.db.DatabaseConstants.DB_SETTINGS_NAMESPACE;
 import static org.briarproject.bramble.db.DatabaseConstants.SCHEMA_VERSION_KEY;
 import static org.briarproject.bramble.db.ExponentialBackoff.calculateExpiry;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * A generic database implementation that can be used with any JDBC-compatible
@@ -76,7 +74,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
-	static final int CODE_SCHEMA_VERSION = 39;
+	static final int CODE_SCHEMA_VERSION = 38;
 
 	// Rotation period offsets for incoming transport keys
 	private static final int OFFSET_PREV = -1;
@@ -238,7 +236,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " (transportId _STRING NOT NULL,"
 					+ " keySetId _COUNTER,"
 					+ " rotationPeriod BIGINT NOT NULL,"
-					+ " contactId INT NOT NULL,"
+					+ " contactId INT," // Null if keys are not bound
 					+ " tagKey _SECRET NOT NULL,"
 					+ " headerKey _SECRET NOT NULL,"
 					+ " stream BIGINT NOT NULL,"
@@ -257,7 +255,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " (transportId _STRING NOT NULL,"
 					+ " keySetId INT NOT NULL,"
 					+ " rotationPeriod BIGINT NOT NULL,"
-					+ " contactId INT NOT NULL,"
+					+ " contactId INT," // Null if keys are not bound
 					+ " tagKey _SECRET NOT NULL,"
 					+ " headerKey _SECRET NOT NULL,"
 					+ " base BIGINT NOT NULL,"
@@ -391,7 +389,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
 	List<Migration<Connection>> getMigrations() {
-		return singletonList(new Migration38_39());
+		return Collections.emptyList();
 	}
 
 	private void storeSchemaVersion(Connection txn, int version)
@@ -405,7 +403,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		try {
 			if (rs != null) rs.close();
 		} catch (SQLException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -413,7 +411,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		try {
 			if (s != null) s.close();
 		} catch (SQLException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -510,11 +508,12 @@ abstract class JdbcDatabase implements Database<Connection> {
 			}
 		} catch (SQLException e) {
 			// Try to close the connection
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			try {
 				txn.close();
 			} catch (SQLException e1) {
-				logException(LOG, WARNING, e1);
+				if (LOG.isLoggable(WARNING))
+					LOG.log(WARNING, e1.toString(), e1);
 			}
 			// Whatever happens, allow the database to close
 			connectionsLock.lock();
@@ -884,7 +883,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 	}
 
 	@Override
-	public KeySetId addTransportKeys(Connection txn, ContactId c,
+	public KeySetId addTransportKeys(Connection txn, @Nullable ContactId c,
 			TransportKeys k) throws DbException {
 		PreparedStatement ps = null;
 		ResultSet rs = null;
@@ -894,7 +893,8 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " rotationPeriod, tagKey, headerKey, stream, active)"
 					+ " VALUES (?, ?, ?, ?, ?, ?, ?)";
 			ps = txn.prepareStatement(sql);
-			ps.setInt(1, c.getInt());
+			if (c == null) ps.setNull(1, INTEGER);
+			else ps.setInt(1, c.getInt());
 			ps.setString(2, k.getTransportId().getString());
 			OutgoingKeys outCurr = k.getCurrentOutgoingKeys();
 			ps.setLong(3, outCurr.getRotationPeriod());
@@ -922,7 +922,8 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)";
 			ps = txn.prepareStatement(sql);
 			ps.setInt(1, keySetId.getInt());
-			ps.setInt(2, c.getInt());
+			if (c == null) ps.setNull(2, INTEGER);
+			else ps.setInt(2, c.getInt());
 			ps.setString(3, k.getTransportId().getString());
 			// Previous rotation period
 			IncomingKeys inPrev = k.getPreviousIncomingKeys();
@@ -964,6 +965,33 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
+	@Override
+	public void bindTransportKeys(Connection txn, ContactId c, TransportId t,
+			KeySetId k) throws DbException {
+		PreparedStatement ps = null;
+		try {
+			String sql = "UPDATE outgoingKeys SET contactId = ?"
+					+ " WHERE keySetId = ?";
+			ps = txn.prepareStatement(sql);
+			ps.setInt(1, c.getInt());
+			ps.setInt(2, k.getInt());
+			int affected = ps.executeUpdate();
+			if (affected < 0) throw new DbStateException();
+			ps.close();
+			sql = "UPDATE incomingKeys SET contactId = ?"
+					+ " WHERE keySetId = ?";
+			ps = txn.prepareStatement(sql);
+			ps.setInt(1, c.getInt());
+			ps.setInt(2, k.getInt());
+			affected = ps.executeUpdate();
+			if (affected < 0) throw new DbStateException();
+			ps.close();
+		} catch (SQLException e) {
+			tryToClose(ps);
+			throw new DbException(e);
+		}
+	}
+
 	@Override
 	public boolean containsContact(Connection txn, AuthorId remote,
 			AuthorId local) throws DbException {
@@ -2144,6 +2172,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 				if (inKeys.size() < (i + 1) * 3) throw new DbStateException();
 				KeySetId keySetId = new KeySetId(rs.getInt(1));
 				ContactId contactId = new ContactId(rs.getInt(2));
+				if (rs.wasNull()) contactId = null;
 				long rotationPeriod = rs.getLong(3);
 				SecretKey tagKey = new SecretKey(rs.getBytes(4));
 				SecretKey headerKey = new SecretKey(rs.getBytes(5));

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

@@ -1,55 +0,0 @@
-package org.briarproject.bramble.db;
-
-import org.briarproject.bramble.api.db.DbException;
-
-import java.sql.Connection;
-import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-class Migration38_39 implements Migration<Connection> {
-
-	private static final Logger LOG =
-			Logger.getLogger(Migration38_39.class.getName());
-
-	@Override
-	public int getStartVersion() {
-		return 38;
-	}
-
-	@Override
-	public int getEndVersion() {
-		return 39;
-	}
-
-	@Override
-	public void migrate(Connection txn) throws DbException {
-		Statement s = null;
-		try {
-			s = txn.createStatement();
-			// Add not null constraints
-			s.execute("ALTER TABLE outgoingKeys"
-					+ " ALTER COLUMN contactId"
-					+ " SET NOT NULL");
-			s.execute("ALTER TABLE incomingKeys"
-					+ " ALTER COLUMN contactId"
-					+ " SET NOT NULL");
-		} catch (SQLException e) {
-			tryToClose(s);
-			throw new DbException(e);
-		}
-	}
-
-	private void tryToClose(@Nullable Statement s) {
-		try {
-			if (s != null) s.close();
-		} catch (SQLException e) {
-			logException(LOG, WARNING, e);
-		}
-	}
-}

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

@@ -31,7 +31,6 @@ import javax.annotation.Nullable;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.CONNECTION_TIMEOUT;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class KeyAgreementConnector {
@@ -135,7 +134,7 @@ class KeyAgreementConnector {
 			Thread.currentThread().interrupt();
 			return null;
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return null;
 		} finally {
 			stopListening();

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

@@ -28,7 +28,6 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -121,11 +120,13 @@ class KeyAgreementTaskImpl extends Thread implements KeyAgreementTask,
 			// Broadcast result to caller
 			eventBus.broadcast(new KeyAgreementFinishedEvent(result));
 		} catch (AbortException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING))
+				LOG.log(WARNING, e.toString(), e);
 			// Notify caller that the protocol was aborted
 			eventBus.broadcast(new KeyAgreementAbortedEvent(e.receivedAbort));
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING))
+				LOG.log(WARNING, e.toString(), e);
 			// Notify caller that the connection failed
 			eventBus.broadcast(new KeyAgreementFailedEvent());
 		}

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

@@ -20,7 +20,6 @@ import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PR
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.ABORT;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.CONFIRM;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.KEY;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * Handles the sending and receiving of BQP records.
@@ -73,7 +72,7 @@ class KeyAgreementTransport {
 		try {
 			writeRecord(ABORT, new byte[0]);
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			exception = true;
 		}
 		tryToClose(exception);
@@ -84,7 +83,7 @@ class KeyAgreementTransport {
 			kac.getConnection().getReader().dispose(exception, true);
 			kac.getConnection().getWriter().dispose(exception);
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 

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

@@ -30,7 +30,6 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 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 org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.MIGRATING_DATABASE;
@@ -44,9 +43,6 @@ import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResul
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.DB_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SERVICE_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
-import static org.briarproject.bramble.util.LogUtils.logDuration;
-import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -105,20 +101,24 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 	}
 
 	private LocalAuthor createLocalAuthor(String nickname) {
-		long start = now();
+		long now = System.currentTimeMillis();
 		KeyPair keyPair = crypto.generateSignatureKeyPair();
 		byte[] publicKey = keyPair.getPublic().getEncoded();
 		byte[] privateKey = keyPair.getPrivate().getEncoded();
 		LocalAuthor localAuthor = authorFactory
 				.createLocalAuthor(nickname, publicKey, privateKey);
-		logDuration(LOG, "Creating local author", start);
+		long duration = System.currentTimeMillis() - now;
+		if (LOG.isLoggable(INFO))
+			LOG.info("Creating local author took " + duration + " ms");
 		return localAuthor;
 	}
 
 	private void registerLocalAuthor(LocalAuthor author) throws DbException {
-		long start = now();
+		long now = System.currentTimeMillis();
 		identityManager.registerLocalAuthor(author);
-		logDuration(LOG, "Registering local author", start);
+		long duration = System.currentTimeMillis() - now;
+		if (LOG.isLoggable(INFO))
+			LOG.info("Registering local author took " + duration + " ms");
 	}
 
 	@Override
@@ -129,11 +129,15 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 		}
 		try {
 			LOG.info("Starting services");
-			long start = now();
+			long start = System.currentTimeMillis();
 
 			boolean reopened = db.open(this);
-			if (reopened) logDuration(LOG, "Reopening database", start);
+			long duration = System.currentTimeMillis() - start;
-			else logDuration(LOG, "Creating database", start);
+			if (LOG.isLoggable(INFO)) {
+				if (reopened)
+					LOG.info("Reopening database took " + duration + " ms");
+				else LOG.info("Creating database took " + duration + " ms");
+			}
 
 			if (nickname != null) {
 				registerLocalAuthor(createLocalAuthor(nickname));
@@ -146,11 +150,13 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			Transaction txn = db.startTransaction(false);
 			try {
 				for (Client c : clients) {
-					start = now();
+					start = System.currentTimeMillis();
 					c.createLocalState(txn);
-					if (LOG.isLoggable(FINE)) {
+					duration = System.currentTimeMillis() - start;
-						logDuration(LOG, "Starting client "
+					if (LOG.isLoggable(INFO)) {
-								+ c.getClass().getSimpleName(), start);
+						LOG.info("Starting client "
+								+ c.getClass().getSimpleName()
+								+ " took " + duration + " ms");
 					}
 				}
 				db.commitTransaction(txn);
@@ -158,11 +164,12 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 				db.endTransaction(txn);
 			}
 			for (Service s : services) {
-				start = now();
+				start = System.currentTimeMillis();
 				s.startService();
-				if (LOG.isLoggable(FINE)) {
+				duration = System.currentTimeMillis() - start;
-					logDuration(LOG, "Starting service "
+				if (LOG.isLoggable(INFO)) {
-							+ s.getClass().getSimpleName(), start);
+					LOG.info("Starting service " + s.getClass().getSimpleName()
+							+ " took " + duration + " ms");
 				}
 			}
 
@@ -171,16 +178,16 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			eventBus.broadcast(new LifecycleEvent(RUNNING));
 			return SUCCESS;
 		} catch (DataTooOldException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return DATA_TOO_OLD_ERROR;
 		} catch (DataTooNewException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return DATA_TOO_NEW_ERROR;
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return DB_ERROR;
 		} catch (ServiceException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return SERVICE_ERROR;
 		} finally {
 			startStopSemaphore.release();
@@ -206,26 +213,29 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			state = STOPPING;
 			eventBus.broadcast(new LifecycleEvent(STOPPING));
 			for (Service s : services) {
-				long start = now();
+				long start = System.currentTimeMillis();
 				s.stopService();
-				if (LOG.isLoggable(FINE)) {
+				long duration = System.currentTimeMillis() - start;
-					logDuration(LOG, "Stopping service "
+				if (LOG.isLoggable(INFO)) {
-							+ s.getClass().getSimpleName(), start);
+					LOG.info("Stopping service " + s.getClass().getSimpleName()
+							+ " took " + duration + " ms");
 				}
 			}
 			for (ExecutorService e : executors) {
-				if (LOG.isLoggable(FINE)) {
+				if (LOG.isLoggable(INFO)) {
-					LOG.fine("Stopping executor "
+					LOG.info("Stopping executor "
 							+ e.getClass().getSimpleName());
 				}
 				e.shutdownNow();
 			}
-			long start = now();
+			long start = System.currentTimeMillis();
 			db.close();
-			logDuration(LOG, "Closing database", start);
+			long duration = System.currentTimeMillis() - start;
+			if (LOG.isLoggable(INFO))
+				LOG.info("Closing database took " + duration + " ms");
 			shutdownLatch.countDown();
 		} catch (DbException | ServiceException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		} finally {
 			startStopSemaphore.release();
 		}

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

@@ -14,12 +14,12 @@ import org.briarproject.bramble.api.sync.SyncSessionFactory;
 import org.briarproject.bramble.api.transport.KeyManager;
 import org.briarproject.bramble.api.transport.StreamContext;
 import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
@@ -27,7 +27,6 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 class ConnectionManagerImpl implements ConnectionManager {
 
@@ -102,7 +101,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 
 	private SyncSession createSimplexOutgoingSession(StreamContext ctx,
 			TransportConnectionWriter w) throws IOException {
-		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
+		OutputStream streamWriter = streamWriterFactory.createStreamWriter(
 				w.getOutputStream(), ctx);
 		return syncSessionFactory.createSimplexOutgoingSession(
 				ctx.getContactId(), w.getMaxLatency(), streamWriter);
@@ -110,7 +109,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 
 	private SyncSession createDuplexOutgoingSession(StreamContext ctx,
 			TransportConnectionWriter w) throws IOException {
-		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
+		OutputStream streamWriter = streamWriterFactory.createStreamWriter(
 				w.getOutputStream(), ctx);
 		return syncSessionFactory.createDuplexOutgoingSession(
 				ctx.getContactId(), w.getMaxLatency(), w.getMaxIdleTime(),
@@ -136,7 +135,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeReader(true, false);
 				return;
 			}
@@ -152,7 +151,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				createIncomingSession(ctx, reader).run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -164,7 +163,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 	}
@@ -189,7 +188,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeWriter(true);
 				return;
 			}
@@ -205,7 +204,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				createSimplexOutgoingSession(ctx, writer).run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeWriter(true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -217,7 +216,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 	}
@@ -247,7 +246,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeReader(true, false);
 				return;
 			}
@@ -266,7 +265,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				incomingSession.run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -280,7 +279,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeWriter(true);
 				return;
 			}
@@ -295,30 +294,28 @@ class ConnectionManagerImpl implements ConnectionManager {
 				outgoingSession.run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeWriter(true);
 			}
 		}
 
 		private void disposeReader(boolean exception, boolean recognised) {
-			// Interrupt the outgoing session so it finishes cleanly
+			if (exception && outgoingSession != null)
-			if (outgoingSession != null) outgoingSession.interrupt();
+				outgoingSession.interrupt();
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 
 		private void disposeWriter(boolean exception) {
-			// Interrupt the incoming session if an exception occurred,
-			// otherwise wait for the end of stream marker
 			if (exception && incomingSession != null)
 				incomingSession.interrupt();
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 	}
@@ -348,7 +345,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeWriter(true);
 				return;
 			}
@@ -365,7 +362,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				outgoingSession.run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeWriter(true);
 			}
 		}
@@ -377,7 +374,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeReader(true, false);
 				return;
 			}
@@ -401,7 +398,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				incomingSession.run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -410,24 +407,22 @@ class ConnectionManagerImpl implements ConnectionManager {
 		}
 
 		private void disposeReader(boolean exception, boolean recognised) {
-			// Interrupt the outgoing session so it finishes cleanly
+			if (exception && outgoingSession != null)
-			if (outgoingSession != null) outgoingSession.interrupt();
+				outgoingSession.interrupt();
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 
 		private void disposeWriter(boolean exception) {
-			// Interrupt the incoming session if an exception occurred,
-			// otherwise wait for the end of stream marker
 			if (exception && incomingSession != null)
 				incomingSession.interrupt();
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 	}

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

@@ -106,7 +106,7 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 			if (m == null) return Collections.emptyList();
 			List<ContactId> ids = new ArrayList<>(m.keySet());
 			if (LOG.isLoggable(INFO))
-				LOG.info(ids.size() + " contacts connected: " + t);
+				LOG.info(ids.size() + " contacts connected");
 			return ids;
 		} finally {
 			lock.unlock();

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

@@ -8,7 +8,6 @@ import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.lifecycle.ServiceException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionManager;
-import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.PluginConfig;
@@ -30,31 +29,25 @@ import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
-import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.ui.UiCallback;
-import org.briarproject.bramble.api.system.Scheduler;
 
-import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.ThreadSafe;
 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 org.briarproject.bramble.util.LogUtils.logDuration;
-import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -64,15 +57,12 @@ class PluginManagerImpl implements PluginManager, Service {
 			Logger.getLogger(PluginManagerImpl.class.getName());
 
 	private final Executor ioExecutor;
-	private final ScheduledExecutorService scheduler;
 	private final EventBus eventBus;
 	private final PluginConfig pluginConfig;
 	private final ConnectionManager connectionManager;
-	private final ConnectionRegistry connectionRegistry;
 	private final SettingsManager settingsManager;
 	private final TransportPropertyManager transportPropertyManager;
-	private final SecureRandom random;
+	private final UiCallback uiCallback;
-	private final Clock clock;
 	private final Map<TransportId, Plugin> plugins;
 	private final List<SimplexPlugin> simplexPlugins;
 	private final List<DuplexPlugin> duplexPlugins;
@@ -80,41 +70,27 @@ class PluginManagerImpl implements PluginManager, Service {
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
 	@Inject
-	PluginManagerImpl(@IoExecutor Executor ioExecutor,
+	PluginManagerImpl(@IoExecutor Executor ioExecutor, EventBus eventBus,
-			@Scheduler ScheduledExecutorService scheduler, EventBus eventBus,
 			PluginConfig pluginConfig, ConnectionManager connectionManager,
-			ConnectionRegistry connectionRegistry,
 			SettingsManager settingsManager,
 			TransportPropertyManager transportPropertyManager,
-			SecureRandom random, Clock clock) {
+			UiCallback uiCallback) {
 		this.ioExecutor = ioExecutor;
-		this.scheduler = scheduler;
 		this.eventBus = eventBus;
 		this.pluginConfig = pluginConfig;
 		this.connectionManager = connectionManager;
-		this.connectionRegistry = connectionRegistry;
 		this.settingsManager = settingsManager;
 		this.transportPropertyManager = transportPropertyManager;
-		this.random = random;
+		this.uiCallback = uiCallback;
-		this.clock = clock;
 		plugins = new ConcurrentHashMap<>();
 		simplexPlugins = new CopyOnWriteArrayList<>();
 		duplexPlugins = new CopyOnWriteArrayList<>();
 		startLatches = new ConcurrentHashMap<>();
-
 	}
 
 	@Override
-	public void startService() {
+	public void startService() throws ServiceException {
 		if (used.getAndSet(true)) throw new IllegalStateException();
-		// Instantiate the poller
-		if (pluginConfig.shouldPoll()) {
-			LOG.info("Starting poller");
-			Poller poller = new Poller(ioExecutor, scheduler, connectionManager,
-					connectionRegistry, this, transportPropertyManager, random,
-					clock);
-			eventBus.addListener(poller);
-		}
 		// Instantiate the simplex plugins and start them asynchronously
 		LOG.info("Starting simplex plugins");
 		for (SimplexPluginFactory f : pluginConfig.getSimplexFactories()) {
@@ -209,16 +185,17 @@ class PluginManagerImpl implements PluginManager, Service {
 		@Override
 		public void run() {
 			try {
-				long start = now();
+				long start = System.currentTimeMillis();
 				plugin.start();
-				if (LOG.isLoggable(FINE)) {
+				long duration = System.currentTimeMillis() - start;
-					logDuration(LOG, "Starting plugin " + plugin.getId(),
+				if (LOG.isLoggable(INFO)) {
-							start);
+					LOG.info("Starting plugin " + plugin.getId() + " took " +
+							duration + " ms");
 				}
 			} catch (PluginException e) {
 				if (LOG.isLoggable(WARNING)) {
 					LOG.warning("Plugin " + plugin.getId() + " did not start");
-					logException(LOG, WARNING, e);
+					LOG.log(WARNING, e.toString(), e);
 				}
 			} finally {
 				startLatch.countDown();
@@ -246,11 +223,12 @@ class PluginManagerImpl implements PluginManager, Service {
 				// Wait for the plugin to finish starting
 				startLatch.await();
 				// Stop the plugin
-				long start = now();
+				long start = System.currentTimeMillis();
 				plugin.stop();
-				if (LOG.isLoggable(FINE)) {
+				long duration = System.currentTimeMillis() - start;
-					logDuration(LOG, "Stopping plugin " + plugin.getId(),
+				if (LOG.isLoggable(INFO)) {
-							start);
+					LOG.info("Stopping plugin " + plugin.getId()
+							+ " took " + duration + " ms");
 				}
 			} catch (InterruptedException e) {
 				LOG.warning("Interrupted while waiting for plugin to stop");
@@ -258,7 +236,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			} catch (PluginException e) {
 				if (LOG.isLoggable(WARNING)) {
 					LOG.warning("Plugin " + plugin.getId() + " did not stop");
-					logException(LOG, WARNING, e);
+					LOG.log(WARNING, e.toString(), e);
 				}
 			} finally {
 				stopLatch.countDown();
@@ -280,7 +258,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				return settingsManager.getSettings(id.getString());
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				return new Settings();
 			}
 		}
@@ -290,7 +268,27 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				return transportPropertyManager.getLocalProperties(id);
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				return new TransportProperties();
+			}
+		}
+
+		@Override
+		public Map<ContactId, TransportProperties> getRemoteProperties() {
+			try {
+				return transportPropertyManager.getRemoteProperties(id);
+			} catch (DbException e) {
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				return Collections.emptyMap();
+			}
+		}
+
+		@Override
+		public TransportProperties getRemoteProperties(ContactId c) {
+			try {
+				return transportPropertyManager.getRemoteProperties(c, id);
+			} catch (DbException e) {
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				return new TransportProperties();
 			}
 		}
@@ -300,7 +298,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				settingsManager.mergeSettings(s, id.getString());
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 
@@ -309,10 +307,25 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				transportPropertyManager.mergeLocalProperties(id, p);
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 
+		@Override
+		public int showChoice(String[] options, String... message) {
+			return uiCallback.showChoice(options, message);
+		}
+
+		@Override
+		public boolean showConfirmationMessage(String... message) {
+			return uiCallback.showConfirmationMessage(message);
+		}
+
+		@Override
+		public void showMessage(String... message) {
+			uiCallback.showMessage(message);
+		}
+
 		@Override
 		public void transportEnabled() {
 			eventBus.broadcast(new TransportEnabledEvent(id));

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

@@ -1,10 +1,18 @@
 package org.briarproject.bramble.plugin;
 
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
 import org.briarproject.bramble.api.plugin.ConnectionManager;
 import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.PluginManager;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.Scheduler;
+
+import java.security.SecureRandom;
+import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
 
 import javax.inject.Inject;
 import javax.inject.Singleton;
@@ -18,6 +26,8 @@ public class PluginModule {
 	public static class EagerSingletons {
 		@Inject
 		PluginManager pluginManager;
+		@Inject
+		Poller poller;
 	}
 
 	@Provides
@@ -25,6 +35,19 @@ public class PluginModule {
 		return new BackoffFactoryImpl();
 	}
 
+	@Provides
+	@Singleton
+	Poller providePoller(@IoExecutor Executor ioExecutor,
+			@Scheduler ScheduledExecutorService scheduler,
+			ConnectionManager connectionManager,
+			ConnectionRegistry connectionRegistry, PluginManager pluginManager,
+			SecureRandom random, Clock clock, EventBus eventBus) {
+		Poller poller = new Poller(ioExecutor, scheduler, connectionManager,
+				connectionRegistry, pluginManager, random, clock);
+		eventBus.addListener(poller);
+		return poller;
+	}
+
 	@Provides
 	@Singleton
 	ConnectionManager provideConnectionManager(

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

@@ -2,7 +2,6 @@ package org.briarproject.bramble.plugin;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.event.ContactStatusChangedEvent;
-import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -20,15 +19,14 @@ import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
 import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
 import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
-import org.briarproject.bramble.api.properties.TransportProperties;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.Scheduler;
 
 import java.security.SecureRandom;
-import java.util.Collection;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Future;
 import java.util.concurrent.ScheduledExecutorService;
@@ -37,11 +35,10 @@ import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.ThreadSafe;
+import javax.inject.Inject;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -54,38 +51,40 @@ class Poller implements EventListener {
 	private final ConnectionManager connectionManager;
 	private final ConnectionRegistry connectionRegistry;
 	private final PluginManager pluginManager;
-	private final TransportPropertyManager transportPropertyManager;
 	private final SecureRandom random;
 	private final Clock clock;
 	private final Lock lock;
 	private final Map<TransportId, ScheduledPollTask> tasks; // Locking: lock
+	private final Set<TransportId> polling; // Locking: lock
 
+	@Inject
 	Poller(@IoExecutor Executor ioExecutor,
 			@Scheduler ScheduledExecutorService scheduler,
 			ConnectionManager connectionManager,
 			ConnectionRegistry connectionRegistry, PluginManager pluginManager,
-			TransportPropertyManager transportPropertyManager,
 			SecureRandom random, Clock clock) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.connectionManager = connectionManager;
 		this.connectionRegistry = connectionRegistry;
 		this.pluginManager = pluginManager;
-		this.transportPropertyManager = transportPropertyManager;
 		this.random = random;
 		this.clock = clock;
 		lock = new ReentrantLock();
 		tasks = new HashMap<>();
+		polling = new HashSet<>();
 	}
 
 	@Override
 	public void eventOccurred(Event e) {
 		if (e instanceof ContactStatusChangedEvent) {
 			ContactStatusChangedEvent c = (ContactStatusChangedEvent) e;
+			/*
 			if (c.isActive()) {
 				// Connect to the newly activated contact
 				connectToContact(c.getContactId());
 			}
+			*/
 		} else if (e instanceof ConnectionClosedEvent) {
 			ConnectionClosedEvent c = (ConnectionClosedEvent) e;
 			// Reschedule polling, the polling interval may have decreased
@@ -127,15 +126,10 @@ class Poller implements EventListener {
 	private void connectToContact(ContactId c, SimplexPlugin p) {
 		ioExecutor.execute(() -> {
 			TransportId t = p.getId();
-			if (connectionRegistry.isConnected(c, t)) return;
+			if (!connectionRegistry.isConnected(c, t)) {
-			try {
+				TransportConnectionWriter w = p.createWriter(c);
-				TransportProperties props =
-						transportPropertyManager.getRemoteProperties(c, t);
-				TransportConnectionWriter w = p.createWriter(props);
 				if (w != null)
 					connectionManager.manageOutgoingConnection(c, t, w);
-			} catch (DbException e) {
-				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -143,15 +137,10 @@ class Poller implements EventListener {
 	private void connectToContact(ContactId c, DuplexPlugin p) {
 		ioExecutor.execute(() -> {
 			TransportId t = p.getId();
-			if (connectionRegistry.isConnected(c, t)) return;
+			if (!connectionRegistry.isConnected(c, t)) {
-			try {
+				DuplexTransportConnection d = p.createConnection(c);
-				TransportProperties props =
-						transportPropertyManager.getRemoteProperties(c, t);
-				DuplexTransportConnection d = p.createConnection(props);
 				if (d != null)
 					connectionManager.manageOutgoingConnection(c, t, d);
-			} catch (DbException e) {
-				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -203,17 +192,7 @@ class Poller implements EventListener {
 	private void poll(Plugin p) {
 		TransportId t = p.getId();
 		if (LOG.isLoggable(INFO)) LOG.info("Polling plugin " + t);
-		try {
+		p.poll(connectionRegistry.getConnectedContacts(t));
-			Map<ContactId, TransportProperties> remote =
-					transportPropertyManager.getRemoteProperties(t);
-			Collection<ContactId> connected =
-					connectionRegistry.getConnectedContacts(t);
-			remote = new HashMap<>(remote);
-			remote.keySet().removeAll(connected);
-			if (!remote.isEmpty()) p.poll(remote);
-		} catch (DbException e) {
-			logException(LOG, WARNING, e);
-		}
 	}
 
 	private class ScheduledPollTask {
@@ -242,20 +221,33 @@ class Poller implements EventListener {
 		@Override
 		@IoExecutor
 		public void run() {
+			TransportId t = plugin.getId();
+			boolean shouldPoll;
 			lock.lock();
 			try {
-				TransportId t = plugin.getId();
 				ScheduledPollTask scheduled = tasks.get(t);
 				if (scheduled != null && scheduled.task != this)
 					return; // Replaced by another task
 				tasks.remove(t);
+				// Don't poll again if last poll is still running
+				shouldPoll = polling.add(t);
 			} finally {
 				lock.unlock();
 			}
 			int delay = plugin.getPollingInterval();
 			if (randomiseNext) delay = (int) (delay * random.nextDouble());
 			schedule(plugin, delay, false);
-			poll(plugin);
+			if (shouldPoll) {
+				poll(plugin);
+			} else if (LOG.isLoggable(INFO)) {
+				LOG.info("Last poll for " + t + " is still running");
+			}
+			lock.lock();
+			try {
+				polling.remove(t);
+			} finally {
+				lock.unlock();
+			}
 		}
 	}
 }

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

@@ -13,7 +13,6 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 @ThreadSafe
@@ -93,7 +92,7 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 			conn.getWriter().dispose(false);
 			conn.getReader().dispose(false, false);
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 

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

@@ -26,8 +26,11 @@ import org.briarproject.bramble.util.StringUtils;
 
 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.Map;
-import java.util.Map.Entry;
 import java.util.UUID;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -43,7 +46,6 @@ import static org.briarproject.bramble.api.plugin.BluetoothConstants.PREF_BT_ENA
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_ADDRESS;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_UUID;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.UUID_BYTES;
-import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 
 @MethodsNotNullByDefault
@@ -53,6 +55,12 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	private static final Logger LOG =
 			Logger.getLogger(BluetoothPlugin.class.getName());
 
+	/**
+	 * How many milliseconds to pause between connection attempts when
+	 * polling, to avoid interfering with other Bluetooth or wifi connections.
+	 */
+	private static final int POLLING_PAUSE_MS = 3000;
+
 	final BluetoothConnectionLimiter connectionLimiter;
 
 	private final Executor ioExecutor;
@@ -170,7 +178,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 			try {
 				ss = openServerSocket(contactConnectionsUuid);
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				return;
 			}
 			if (!isRunning() || !shouldAllowContactConnections()) {
@@ -250,27 +258,45 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	}
 
 	@Override
-	public void poll(Map<ContactId, TransportProperties> contacts) {
+	public void poll(Collection<ContactId> connected) {
 		if (!isRunning() || !shouldAllowContactConnections()) return;
 		backoff.increment();
-		// Try to connect to known devices in parallel
+		// Try to connect to known devices in a random order
-		for (Entry<ContactId, TransportProperties> e : contacts.entrySet()) {
+		Map<ContactId, TransportProperties> remote =
-			String address = e.getValue().get(PROP_ADDRESS);
+				callback.getRemoteProperties();
-			if (StringUtils.isNullOrEmpty(address)) continue;
+		List<ContactId> keys = new ArrayList<>(remote.keySet());
-			String uuid = e.getValue().get(PROP_UUID);
+		Collections.shuffle(keys);
-			if (StringUtils.isNullOrEmpty(uuid)) continue;
+		ioExecutor.execute(() -> {
-			ContactId c = e.getKey();
+			boolean first = true;
-			ioExecutor.execute(() -> {
+			for (ContactId c : keys) {
 				if (!isRunning() || !shouldAllowContactConnections()) return;
 				if (!connectionLimiter.canOpenContactConnection()) return;
+				if (connected.contains(c)) continue;
+				TransportProperties p = remote.get(c);
+				String address = p.get(PROP_ADDRESS);
+				if (StringUtils.isNullOrEmpty(address)) continue;
+				String uuid = p.get(PROP_UUID);
+				if (StringUtils.isNullOrEmpty(uuid)) continue;
+				// Pause between connection attempts
+				if (first) {
+					first = false;
+				} else {
+					try {
+						Thread.sleep(POLLING_PAUSE_MS);
+					} catch (InterruptedException ex) {
+						LOG.info("Interrupted while polling");
+						Thread.currentThread().interrupt();
+						return;
+					}
+				}
 				DuplexTransportConnection conn = connect(address, uuid);
 				if (conn != null) {
 					backoff.reset();
 					if (connectionLimiter.contactConnectionOpened(conn))
 						callback.outgoingConnectionCreated(c, conn);
 				}
-			});
+			}
-		}
+		});
 	}
 
 	@Nullable
@@ -305,9 +331,10 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	}
 
 	@Override
-	public DuplexTransportConnection createConnection(TransportProperties p) {
+	public DuplexTransportConnection createConnection(ContactId c) {
 		if (!isRunning() || !shouldAllowContactConnections()) return null;
 		if (!connectionLimiter.canOpenContactConnection()) return null;
+		TransportProperties p = callback.getRemoteProperties(c);
 		String address = p.get(PROP_ADDRESS);
 		if (StringUtils.isNullOrEmpty(address)) return null;
 		String uuid = p.get(PROP_UUID);
@@ -337,7 +364,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		try {
 			ss = openServerSocket(uuid);
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return null;
 		}
 		if (!isRunning()) {

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

@@ -1,22 +1,27 @@
 package org.briarproject.bramble.plugin.file;
 
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginCallback;
-import org.briarproject.bramble.api.properties.TransportProperties;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Collection;
+import java.util.Locale;
+import java.util.concurrent.Executor;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 
+import javax.annotation.Nullable;
+
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.api.plugin.FileConstants.PROP_PATH;
+import static org.briarproject.bramble.api.transport.TransportConstants.MIN_STREAM_LENGTH;
-import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
 @NotNullByDefault
 abstract class FilePlugin implements SimplexPlugin {
@@ -24,15 +29,25 @@ abstract class FilePlugin implements SimplexPlugin {
 	private static final Logger LOG =
 			Logger.getLogger(FilePlugin.class.getName());
 
+	protected final Executor ioExecutor;
 	protected final SimplexPluginCallback callback;
 	protected final int maxLatency;
+	protected final AtomicBoolean used = new AtomicBoolean(false);
 
-	protected abstract void writerFinished(File f, boolean exception);
+	protected volatile boolean running = false;
 
-	protected abstract void readerFinished(File f, boolean exception,
+	@Nullable
-			boolean recognised);
+	protected abstract File chooseOutputDirectory();
 
-	FilePlugin(SimplexPluginCallback callback, int maxLatency) {
+	protected abstract Collection<File> findFilesByName(String filename);
+
+	protected abstract void writerFinished(File f);
+
+	protected abstract void readerFinished(File f);
+
+	protected FilePlugin(Executor ioExecutor, SimplexPluginCallback callback,
+			int maxLatency) {
+		this.ioExecutor = ioExecutor;
 		this.callback = callback;
 		this.maxLatency = maxLatency;
 	}
@@ -43,36 +58,81 @@ abstract class FilePlugin implements SimplexPlugin {
 	}
 
 	@Override
-	public TransportConnectionReader createReader(TransportProperties p) {
+	public int getMaxIdleTime() {
-		if (!isRunning()) return null;
+		return Integer.MAX_VALUE; // We don't need keepalives
-		String path = p.get(PROP_PATH);
+	}
-		if (isNullOrEmpty(path)) return null;
+
+	@Override
+	public boolean isRunning() {
+		return running;
+	}
+
+	@Override
+	public TransportConnectionReader createReader(ContactId c) {
+		return null;
+	}
+
+	@Override
+	public TransportConnectionWriter createWriter(ContactId c) {
+		if (!running) return null;
+		return createWriter(createConnectionFilename());
+	}
+
+	private String createConnectionFilename() {
+		StringBuilder s = new StringBuilder(12);
+		for (int i = 0; i < 8; i++) s.append((char) ('a' + Math.random() * 26));
+		s.append(".dat");
+		return s.toString();
+	}
+
+	// Package access for testing
+	boolean isPossibleConnectionFilename(String filename) {
+		return filename.toLowerCase(Locale.US).matches("[a-z]{8}\\.dat");
+	}
+
+	@Nullable
+	private TransportConnectionWriter createWriter(String filename) {
+		if (!running) return null;
+		File dir = chooseOutputDirectory();
+		if (dir == null || !dir.exists() || !dir.isDirectory()) return null;
+		File f = new File(dir, filename);
 		try {
-			File file = new File(path);
+			long capacity = dir.getFreeSpace();
-			FileInputStream in = new FileInputStream(file);
+			if (capacity < MIN_STREAM_LENGTH) return null;
-			return new FileTransportReader(file, in, this);
+			OutputStream out = new FileOutputStream(f);
+			return new FileTransportWriter(f, out, capacity, this);
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			f.delete();
 			return null;
 		}
 	}
 
-	@Override
+	protected void createReaderFromFile(File f) {
-	public TransportConnectionWriter createWriter(TransportProperties p) {
+		if (!running) return;
-		if (!isRunning()) return null;
+		ioExecutor.execute(new ReaderCreator(f));
-		String path = p.get(PROP_PATH);
+	}
-		if (isNullOrEmpty(path)) return null;
+
-		try {
+	private class ReaderCreator implements Runnable {
-			File file = new File(path);
+
-			if (!file.exists() && !file.createNewFile()) {
+		private final File file;
-				LOG.info("Failed to create file");
+
-				return null;
+		private ReaderCreator(File file) {
+			this.file = file;
+		}
+
+		@Override
+		public void run() {
+			if (isPossibleConnectionFilename(file.getName())) {
+				try {
+					FileInputStream in = new FileInputStream(file);
+					callback.readerCreated(new FileTransportReader(file, in,
+							FilePlugin.this));
+				} catch (IOException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				}
 			}
-			FileOutputStream out = new FileOutputStream(file);
-			return new FileTransportWriter(file, out, this);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-			return null;
 		}
 	}
 }

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

@@ -9,7 +9,6 @@ import java.io.InputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class FileTransportReader implements TransportConnectionReader {
@@ -37,8 +36,11 @@ class FileTransportReader implements TransportConnectionReader {
 		try {
 			in.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+		}
+		if (recognised) {
+			file.delete();
+			plugin.readerFinished(file);
 		}
-		plugin.readerFinished(file, exception, recognised);
 	}
 }

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

@@ -9,7 +9,6 @@ import java.io.OutputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class FileTransportWriter implements TransportConnectionWriter {
@@ -19,11 +18,14 @@ class FileTransportWriter implements TransportConnectionWriter {
 
 	private final File file;
 	private final OutputStream out;
+	private final long capacity;
 	private final FilePlugin plugin;
 
-	FileTransportWriter(File file, OutputStream out, FilePlugin plugin) {
+	FileTransportWriter(File file, OutputStream out, long capacity,
+			FilePlugin plugin) {
 		this.file = file;
 		this.out = out;
+		this.capacity = capacity;
 		this.plugin = plugin;
 	}
 
@@ -37,6 +39,11 @@ class FileTransportWriter implements TransportConnectionWriter {
 		return plugin.getMaxIdleTime();
 	}
 
+	@Override
+	public long getCapacity() {
+		return capacity;
+	}
+
 	@Override
 	public OutputStream getOutputStream() {
 		return out;
@@ -47,8 +54,9 @@ class FileTransportWriter implements TransportConnectionWriter {
 		try {
 			out.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
-		plugin.writerFinished(file, exception);
+		if (exception) file.delete();
+		else plugin.writerFinished(file);
 	}
 }

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

@@ -35,7 +35,6 @@ 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.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 
 @NotNullByDefault
@@ -296,7 +295,7 @@ class LanTcpPlugin extends TcpPlugin {
 			try {
 				ss.close();
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 	}

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

@@ -17,7 +17,6 @@ import javax.xml.parsers.ParserConfigurationException;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubInetAddress;
 
 @ThreadSafe
@@ -60,7 +59,7 @@ class PortMapperImpl implements PortMapper {
 			if (externalString != null)
 				external = InetAddress.getByName(externalString);
 		} catch (IOException | SAXException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 		return new MappingResult(internal, external, port, succeeded);
 	}
@@ -77,7 +76,7 @@ class PortMapperImpl implements PortMapper {
 		try {
 			d.discover();
 		} catch (IOException | SAXException | ParserConfigurationException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 		gateway = d.getValidGateway();
 	}
@@ -88,7 +87,7 @@ class PortMapperImpl implements PortMapper {
 			if (LOG.isLoggable(INFO))
 				LOG.info("Deleted mapping for port " + port);
 		} catch (IOException | SAXException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 }

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

@@ -37,7 +37,6 @@ import javax.annotation.Nullable;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 
 @MethodsNotNullByDefault
@@ -153,7 +152,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		} finally {
 			callback.transportDisabled();
 		}
@@ -208,16 +207,20 @@ abstract class TcpPlugin implements DuplexPlugin {
 	}
 
 	@Override
-	public void poll(Map<ContactId, TransportProperties> contacts) {
+	public void poll(Collection<ContactId> connected) {
 		if (!isRunning()) return;
 		backoff.increment();
-		for (Entry<ContactId, TransportProperties> e : contacts.entrySet()) {
+		Map<ContactId, TransportProperties> remote =
-			connectAndCallBack(e.getKey(), e.getValue());
+				callback.getRemoteProperties();
+		for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
+			ContactId c = e.getKey();
+			if (!connected.contains(c)) connectAndCallBack(c, e.getValue());
 		}
 	}
 
 	private void connectAndCallBack(ContactId c, TransportProperties p) {
 		ioExecutor.execute(() -> {
+			if (!isRunning()) return;
 			DuplexTransportConnection d = createConnection(p);
 			if (d != null) {
 				backoff.reset();
@@ -227,8 +230,13 @@ abstract class TcpPlugin implements DuplexPlugin {
 	}
 
 	@Override
-	public DuplexTransportConnection createConnection(TransportProperties p) {
+	public DuplexTransportConnection createConnection(ContactId c) {
 		if (!isRunning()) return null;
+		return createConnection(callback.getRemoteProperties(c));
+	}
+
+	@Nullable
+	private DuplexTransportConnection createConnection(TransportProperties p) {
 		for (InetSocketAddress remote : getRemoteSocketAddresses(p)) {
 			if (!isConnectable(remote)) {
 				if (LOG.isLoggable(INFO)) {
@@ -307,7 +315,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 		try {
 			ifaces = Collections.list(NetworkInterface.getNetworkInterfaces());
 		} catch (SocketException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return Collections.emptyList();
 		}
 		List<InetAddress> addrs = new ArrayList<>();

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

@@ -16,7 +16,6 @@ import java.util.logging.Logger;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -79,7 +78,7 @@ class ReliabilityLayerImpl implements ReliabilityLayer, WriteHandler {
 				Thread.currentThread().interrupt();
 				running = false;
 			} catch (IOException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				running = false;
 			}
 		});

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

@@ -1,12 +1,7 @@
 package org.briarproject.bramble.reporting;
 
 import org.briarproject.bramble.api.crypto.CryptoComponent;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.event.EventListener;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TorConstants;
-import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.reporting.DevConfig;
 import org.briarproject.bramble.api.reporting.DevReporter;
 import org.briarproject.bramble.util.IoUtils;
@@ -23,20 +18,17 @@ import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.net.Socket;
-import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
 import javax.net.SocketFactory;
 
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
-class DevReporterImpl implements DevReporter, EventListener {
+class DevReporterImpl implements DevReporter {
 
 	private static final Logger LOG =
 			Logger.getLogger(DevReporterImpl.class.getName());
@@ -44,15 +36,12 @@ class DevReporterImpl implements DevReporter, EventListener {
 	private static final int SOCKET_TIMEOUT = 30 * 1000; // 30 seconds
 	private static final int LINE_LENGTH = 70;
 
-	private final Executor ioExecutor;
 	private final CryptoComponent crypto;
 	private final DevConfig devConfig;
 	private final SocketFactory torSocketFactory;
 
-	@Inject
+	DevReporterImpl(CryptoComponent crypto, DevConfig devConfig,
-	DevReporterImpl(@IoExecutor Executor ioExecutor, CryptoComponent crypto,
+			SocketFactory torSocketFactory) {
-			DevConfig devConfig, SocketFactory torSocketFactory) {
-		this.ioExecutor = ioExecutor;
 		this.crypto = crypto;
 		this.devConfig = devConfig;
 		this.torSocketFactory = torSocketFactory;
@@ -74,7 +63,6 @@ class DevReporterImpl implements DevReporter, EventListener {
 	@Override
 	public void encryptReportToFile(File reportDir, String filename,
 			String report) throws FileNotFoundException {
-		LOG.info("Encrypting report to file");
 		byte[] plaintext = StringUtils.toUtf8(report);
 		byte[] ciphertext = crypto.encryptToKey(devConfig.getDevPublicKey(),
 				plaintext);
@@ -94,17 +82,7 @@ class DevReporterImpl implements DevReporter, EventListener {
 	}
 
 	@Override
-	public void eventOccurred(Event e) {
+	public void sendReports(File reportDir) {
-		if (e instanceof TransportEnabledEvent) {
-			TransportEnabledEvent t = (TransportEnabledEvent) e;
-			if (t.getTransportId().equals(TorConstants.ID))
-				ioExecutor.execute(this::sendReports);
-		}
-	}
-
-	@Override
-	public void sendReports() {
-		File reportDir = devConfig.getReportDir();
 		File[] reports = reportDir.listFiles();
 		if (reports == null || reports.length == 0)
 			return; // No reports to send
@@ -133,7 +111,7 @@ class DevReporterImpl implements DevReporter, EventListener {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -141,7 +119,7 @@ class DevReporterImpl implements DevReporter, EventListener {
 		try {
 			if (s != null) s.close();
 		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 }

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

@@ -1,10 +1,10 @@
 package org.briarproject.bramble.reporting;
 
-import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.crypto.CryptoComponent;
+import org.briarproject.bramble.api.reporting.DevConfig;
 import org.briarproject.bramble.api.reporting.DevReporter;
 
-import javax.inject.Inject;
+import javax.net.SocketFactory;
-import javax.inject.Singleton;
 
 import dagger.Module;
 import dagger.Provides;
@@ -12,16 +12,9 @@ import dagger.Provides;
 @Module
 public class ReportingModule {
 
-	public static class EagerSingletons {
-		@Inject
-		DevReporter devReporter;
-	}
-
 	@Provides
-	@Singleton
+	DevReporter provideDevReporter(CryptoComponent crypto,
-	DevReporter provideDevReporter(DevReporterImpl devReporter,
+			DevConfig devConfig, SocketFactory torSocketFactory) {
-			EventBus eventBus) {
+		return new DevReporterImpl(crypto, devConfig, torSocketFactory);
-		eventBus.addListener(devReporter);
-		return devReporter;
 	}
 }

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

@@ -23,7 +23,6 @@ import org.briarproject.bramble.api.sync.event.MessageSharedEvent;
 import org.briarproject.bramble.api.sync.event.MessageToAckEvent;
 import org.briarproject.bramble.api.sync.event.MessageToRequestEvent;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
 import java.util.Collection;
@@ -42,7 +41,6 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An outgoing {@link SyncSession} suitable for duplex transports. The session
@@ -69,7 +67,6 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 	private final Clock clock;
 	private final ContactId contactId;
 	private final int maxLatency, maxIdleTime;
-	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
 	private final BlockingQueue<ThrowingRunnable<IOException>> writerTasks;
 
@@ -84,8 +81,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 
 	DuplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
 			EventBus eventBus, Clock clock, ContactId contactId, int maxLatency,
-			int maxIdleTime, StreamWriter streamWriter,
+			int maxIdleTime, SyncRecordWriter recordWriter) {
-			SyncRecordWriter recordWriter) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;
 		this.eventBus = eventBus;
@@ -93,7 +89,6 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 		this.contactId = contactId;
 		this.maxLatency = maxLatency;
 		this.maxIdleTime = maxIdleTime;
-		this.streamWriter = streamWriter;
 		this.recordWriter = recordWriter;
 		writerTasks = new LinkedBlockingQueue<>();
 	}
@@ -154,7 +149,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 						dataToFlush = true;
 					}
 				}
-				streamWriter.sendEndOfStream();
+				if (dataToFlush) recordWriter.flush();
 			} catch (InterruptedException e) {
 				LOG.info("Interrupted while waiting for a record to write");
 				Thread.currentThread().interrupt();
@@ -241,7 +236,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated ack: " + (a != null));
 				if (a != null) writerTasks.add(new WriteAck(a));
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}
@@ -288,7 +283,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated batch: " + (b != null));
 				if (b != null) writerTasks.add(new WriteBatch(b));
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}
@@ -335,7 +330,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated offer: " + (o != null));
 				if (o != null) writerTasks.add(new WriteOffer(o));
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}
@@ -380,7 +375,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated request: " + (r != null));
 				if (r != null) writerTasks.add(new WriteRequest(r));
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}

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

@@ -28,7 +28,6 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An incoming {@link SyncSession}.
@@ -64,11 +63,7 @@ class IncomingSession implements SyncSession, EventListener {
 		eventBus.addListener(this);
 		try {
 			// Read records until interrupted or EOF
-			while (!interrupted) {
+			while (!interrupted && !recordReader.eof()) {
-				if (recordReader.eof()) {
-					LOG.info("End of stream");
-					return;
-				}
 				if (recordReader.hasAck()) {
 					Ack a = recordReader.readAck();
 					dbExecutor.execute(new ReceiveAck(a));
@@ -128,7 +123,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}
@@ -154,7 +149,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}
@@ -180,7 +175,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}
@@ -206,7 +201,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}

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

@@ -15,7 +15,6 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.Ack;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
 import java.util.Collection;
@@ -32,7 +31,6 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An outgoing {@link SyncSession} suitable for simplex transports. The session
@@ -53,7 +51,6 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	private final EventBus eventBus;
 	private final ContactId contactId;
 	private final int maxLatency;
-	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
 	private final AtomicInteger outstandingQueries;
 	private final BlockingQueue<ThrowingRunnable<IOException>> writerTasks;
@@ -61,14 +58,13 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	private volatile boolean interrupted = false;
 
 	SimplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
-			EventBus eventBus, ContactId contactId, int maxLatency,
+			EventBus eventBus, ContactId contactId,
-			StreamWriter streamWriter, SyncRecordWriter recordWriter) {
+			int maxLatency, SyncRecordWriter recordWriter) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;
 		this.eventBus = eventBus;
 		this.contactId = contactId;
 		this.maxLatency = maxLatency;
-		this.streamWriter = streamWriter;
 		this.recordWriter = recordWriter;
 		outstandingQueries = new AtomicInteger(2); // One per type of record
 		writerTasks = new LinkedBlockingQueue<>();
@@ -89,7 +85,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 					if (task == CLOSE) break;
 					task.run();
 				}
-				streamWriter.sendEndOfStream();
+				recordWriter.flush();
 			} catch (InterruptedException e) {
 				LOG.info("Interrupted while waiting for a record to write");
 				Thread.currentThread().interrupt();
@@ -140,7 +136,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 				if (a == null) decrementOutstandingQueries();
 				else writerTasks.add(new WriteAck(a));
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}
@@ -185,7 +181,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 				if (b == null) decrementOutstandingQueries();
 				else writerTasks.add(new WriteBatch(b));
 			} catch (DbException e) {
-				logException(LOG, WARNING, e);
+				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				interrupt();
 			}
 		}

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

@@ -12,7 +12,6 @@ import org.briarproject.bramble.api.sync.SyncRecordWriterFactory;
 import org.briarproject.bramble.api.sync.SyncSession;
 import org.briarproject.bramble.api.sync.SyncSessionFactory;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -54,21 +53,19 @@ class SyncSessionFactoryImpl implements SyncSessionFactory {
 
 	@Override
 	public SyncSession createSimplexOutgoingSession(ContactId c,
-			int maxLatency, StreamWriter streamWriter) {
+			int maxLatency, OutputStream out) {
-		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =
 				recordWriterFactory.createRecordWriter(out);
 		return new SimplexOutgoingSession(db, dbExecutor, eventBus, c,
-				maxLatency, streamWriter, recordWriter);
+				maxLatency, recordWriter);
 	}
 
 	@Override
 	public SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxIdleTime, StreamWriter streamWriter) {
+			int maxIdleTime, OutputStream out) {
-		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =
 				recordWriterFactory.createRecordWriter(out);
 		return new DuplexOutgoingSession(db, dbExecutor, eventBus, clock, c,
-				maxLatency, maxIdleTime, streamWriter, recordWriter);
+				maxLatency, maxIdleTime, recordWriter);
 	}
 }

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

@@ -40,7 +40,6 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.INVALID;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.PENDING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -111,7 +110,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			validateNextMessageAsync(unvalidated);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -145,7 +144,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before validation");
 			validateNextMessageAsync(unvalidated);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -166,7 +165,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			deliverNextPendingMessageAsync(pending);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -232,7 +231,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before delivery");
 			deliverNextPendingMessageAsync(pending);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -253,7 +252,8 @@ class ValidationManagerImpl implements ValidationManager, Service,
 				storeMessageContextAsync(m, g.getClientId(),
 						g.getMajorVersion(), context);
 			} catch (InvalidMessageException e) {
-				logException(LOG, INFO, e);
+				if (LOG.isLoggable(INFO))
+					LOG.log(INFO, e.toString(), e);
 				Queue<MessageId> invalidate = new LinkedList<>();
 				invalidate.add(m.getId());
 				invalidateNextMessageAsync(invalidate);
@@ -326,7 +326,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 		} catch (NoSuchGroupException e) {
 			LOG.info("Group removed during validation");
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -377,7 +377,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			shareNextMessageAsync(toShare);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -412,7 +412,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before sharing");
 			shareNextMessageAsync(toShare);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -440,7 +440,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Message removed before invalidation");
 			invalidateNextMessageAsync(invalidate);
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 
@@ -492,7 +492,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 		} catch (NoSuchGroupException e) {
 			LOG.info("Group removed before validation");
 		} catch (DbException e) {
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/system/LinuxSecureRandomProvider.java

@@ -13,7 +13,6 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.Immutable;
 
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
@@ -50,7 +49,7 @@ class LinuxSecureRandomProvider extends AbstractSecureRandomProvider {
 			out.close();
 		} catch (IOException e) {
 			// On some devices /dev/urandom isn't writable - this isn't fatal
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/system/LinuxSecureRandomSpi.java

@@ -10,7 +10,6 @@ import java.security.SecureRandomSpi;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 public class LinuxSecureRandomSpi extends SecureRandomSpi {
 
@@ -40,7 +39,7 @@ public class LinuxSecureRandomSpi extends SecureRandomSpi {
 			out.close();
 		} catch (IOException e) {
 			// On some devices /dev/urandom isn't writable - this isn't fatal
-			logException(LOG, WARNING, e);
+			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/transport/KeyManagerImpl.java

@@ -99,18 +99,39 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 	}
 
 	@Override
-	public Map<TransportId, KeySetId> addContact(Transaction txn, ContactId c,
+	public void addContact(Transaction txn, ContactId c, SecretKey master,
-			SecretKey master, long timestamp, boolean alice, boolean active)
+			long timestamp, boolean alice) throws DbException {
+		for (TransportKeyManager m : managers.values())
+			m.addContact(txn, c, master, timestamp, alice);
+	}
+
+	@Override
+	public Map<TransportId, KeySetId> addUnboundKeys(Transaction txn,
+			SecretKey master, long timestamp, boolean alice)
 			throws DbException {
 		Map<TransportId, KeySetId> ids = new HashMap<>();
 		for (Entry<TransportId, TransportKeyManager> e : managers.entrySet()) {
 			TransportId t = e.getKey();
 			TransportKeyManager m = e.getValue();
-			ids.put(t, m.addContact(txn, c, master, timestamp, alice, active));
+			ids.put(t, m.addUnboundKeys(txn, master, timestamp, alice));
 		}
 		return ids;
 	}
 
+	@Override
+	public void bindKeys(Transaction txn, ContactId c,
+			Map<TransportId, KeySetId> keys) throws DbException {
+		for (Entry<TransportId, KeySetId> e : keys.entrySet()) {
+			TransportId t = e.getKey();
+			TransportKeyManager m = managers.get(t);
+			if (m == null) {
+				if (LOG.isLoggable(INFO)) LOG.info("No key manager for " + t);
+			} else {
+				m.bindKeys(txn, c, e.getValue());
+			}
+		}
+	}
+
 	@Override
 	public void activateKeys(Transaction txn, Map<TransportId, KeySetId> keys)
 			throws DbException {
@@ -125,10 +146,24 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 		}
 	}
 
+	@Override
+	public void removeKeys(Transaction txn, Map<TransportId, KeySetId> keys)
+			throws DbException {
+		for (Entry<TransportId, KeySetId> e : keys.entrySet()) {
+			TransportId t = e.getKey();
+			TransportKeyManager m = managers.get(t);
+			if (m == null) {
+				if (LOG.isLoggable(INFO)) LOG.info("No key manager for " + t);
+			} else {
+				m.removeKeys(txn, e.getValue());
+			}
+		}
+	}
+
 	@Override
 	public boolean canSendOutgoingStreams(ContactId c, TransportId t) {
 		TransportKeyManager m = managers.get(t);
-		return m != null && m.canSendOutgoingStreams(c);
+		return m == null ? false : m.canSendOutgoingStreams(c);
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/transport/MutableKeySet.java

@@ -3,28 +3,32 @@ package org.briarproject.bramble.transport;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.transport.KeySetId;
 
-class MutableKeySet {
+import javax.annotation.Nullable;
+
+public class MutableKeySet {
 
 	private final KeySetId keySetId;
+	@Nullable
 	private final ContactId contactId;
 	private final MutableTransportKeys transportKeys;
 
-	MutableKeySet(KeySetId keySetId, ContactId contactId,
+	public MutableKeySet(KeySetId keySetId, @Nullable ContactId contactId,
 			MutableTransportKeys transportKeys) {
 		this.keySetId = keySetId;
 		this.contactId = contactId;
 		this.transportKeys = transportKeys;
 	}
 
-	KeySetId getKeySetId() {
+	public KeySetId getKeySetId() {
 		return keySetId;
 	}
 
-	ContactId getContactId() {
+	@Nullable
+	public ContactId getContactId() {
 		return contactId;
 	}
 
-	MutableTransportKeys getTransportKeys() {
+	public MutableTransportKeys getTransportKeys() {
 		return transportKeys;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/transport/StreamWriterFactoryImpl.java

@@ -4,7 +4,6 @@ import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.crypto.StreamEncrypterFactory;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.OutputStream;
@@ -24,14 +23,14 @@ class StreamWriterFactoryImpl implements StreamWriterFactory {
 	}
 
 	@Override
-	public StreamWriter createStreamWriter(OutputStream out,
+	public OutputStream createStreamWriter(OutputStream out,
 			StreamContext ctx) {
 		return new StreamWriterImpl(
 				streamEncrypterFactory.createStreamEncrypter(out, ctx));
 	}
 
 	@Override
-	public StreamWriter createContactExchangeStreamWriter(OutputStream out,
+	public OutputStream createContactExchangeStreamWriter(OutputStream out,
 			SecretKey headerKey) {
 		return new StreamWriterImpl(
 				streamEncrypterFactory.createContactExchangeStreamDecrypter(out,

bramble-core/src/main/java/org/briarproject/bramble/transport/StreamWriterImpl.java

@@ -2,7 +2,6 @@ package org.briarproject.bramble.transport;
 
 import org.briarproject.bramble.api.crypto.StreamEncrypter;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
 import java.io.OutputStream;
@@ -18,7 +17,7 @@ import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYL
  */
 @NotThreadSafe
 @NotNullByDefault
-class StreamWriterImpl extends OutputStream implements StreamWriter {
+class StreamWriterImpl extends OutputStream {
 
 	private final StreamEncrypter encrypter;
 	private final byte[] payload;
@@ -30,17 +29,6 @@ class StreamWriterImpl extends OutputStream implements StreamWriter {
 		payload = new byte[MAX_PAYLOAD_LENGTH];
 	}
 
-	@Override
-	public OutputStream getOutputStream() {
-		return this;
-	}
-
-	@Override
-	public void sendEndOfStream() throws IOException {
-		writeFrame(true);
-		encrypter.flush();
-	}
-
 	@Override
 	public void close() throws IOException {
 		writeFrame(true);

bramble-core/src/main/java/org/briarproject/bramble/transport/TransportKeyManager.java

@@ -15,11 +15,18 @@ interface TransportKeyManager {
 
 	void start(Transaction txn) throws DbException;
 
-	KeySetId addContact(Transaction txn, ContactId c, SecretKey master,
+	void addContact(Transaction txn, ContactId c, SecretKey master,
-			long timestamp, boolean alice, boolean active) throws DbException;
+			long timestamp, boolean alice) throws DbException;
+
+	KeySetId addUnboundKeys(Transaction txn, SecretKey master, long timestamp,
+			boolean alice) throws DbException;
+
+	void bindKeys(Transaction txn, ContactId c, KeySetId k) throws DbException;
 
 	void activateKeys(Transaction txn, KeySetId k) throws DbException;
 
+	void removeKeys(Transaction txn, KeySetId k) throws DbException;
+
 	void removeContact(ContactId c);
 
 	boolean canSendOutgoingStreams(ContactId c);