Catch SecurityExceptions from all ConnectivityManager calls.

This issue occurs on Android 11 and no fix is expected. When the issue occurs, Tor connectivity and outgoing LAN connectivity will be broken until the app is restarted.

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

@@ -111,6 +111,8 @@ class AndroidNetworkManager implements NetworkManager, Service {
 
 	@Override
 	public NetworkStatus getNetworkStatus() {
+		// https://issuetracker.google.com/issues/175055271
+		try {
 			NetworkInfo net = connectivityManager.getActiveNetworkInfo();
 			boolean connected = net != null && net.isConnected();
 			boolean wifi = false, ipv6Only = false;
@@ -120,6 +122,10 @@ class AndroidNetworkManager implements NetworkManager, Service {
 				else ipv6Only = areAllAvailableNetworksIpv6Only();
 			}
 			return new NetworkStatus(connected, wifi, ipv6Only);
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
+			return new NetworkStatus(false, false, false);
+		}
 	}
 
 	/**
@@ -130,6 +136,8 @@ class AndroidNetworkManager implements NetworkManager, Service {
 	 */
 	@TargetApi(23)
 	private boolean isActiveNetworkIpv6Only() {
+		// https://issuetracker.google.com/issues/175055271
+		try {
 			Network net = connectivityManager.getActiveNetwork();
 			if (net == null) {
 				LOG.info("No active network");
@@ -147,6 +155,10 @@ class AndroidNetworkManager implements NetworkManager, Service {
 				if (!addr.isMulticastAddress()) hasIpv6Unicast = true;
 			}
 			return hasIpv6Unicast;
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
+			return false;
+		}
 	}
 
 	/**

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

@@ -175,17 +175,25 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	@TargetApi(21)
 	@Nullable
 	private InetAddress getWifiClientIpv6Address() {
+		// https://issuetracker.google.com/issues/175055271
+		try {
 			for (Network net : connectivityManager.getAllNetworks()) {
 				NetworkCapabilities caps =
 						connectivityManager.getNetworkCapabilities(net);
-			if (caps == null || !caps.hasTransport(TRANSPORT_WIFI)) continue;
-			LinkProperties props = connectivityManager.getLinkProperties(net);
+				if (caps == null || !caps.hasTransport(TRANSPORT_WIFI)) {
+					continue;
+				}
+				LinkProperties props =
+						connectivityManager.getLinkProperties(net);
 				if (props == null) continue;
 				for (LinkAddress linkAddress : props.getLinkAddresses()) {
 					InetAddress addr = linkAddress.getAddress();
 					if (isIpv6LinkLocalAddress(addr)) return addr;
 				}
 			}
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
+		}
 		return null;
 	}
 
@@ -227,6 +235,8 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	// network's socket factory may try to connect via another network
 	private SocketFactory getSocketFactory() {
 		if (SDK_INT < 21) return SocketFactory.getDefault();
+		// https://issuetracker.google.com/issues/175055271
+		try {
 			for (Network net : connectivityManager.getAllNetworks()) {
 				NetworkCapabilities caps =
 						connectivityManager.getNetworkCapabilities(net);
@@ -234,6 +244,9 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 					return net.getSocketFactory();
 				}
 			}
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
+		}
 		LOG.warning("Could not find suitable socket factory");
 		return SocketFactory.getDefault();
 	}

briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportCollector.java

@@ -198,6 +198,8 @@ class BriarReportCollector {
 	private ReportItem getConnectivity() {
 		MultiReportInfo connectivityInfo = new MultiReportInfo();
 
+		// https://issuetracker.google.com/issues/175055271
+		try {
 			// Is mobile data available?
 			ConnectivityManager cm = requireNonNull(
 					getSystemService(ctx, ConnectivityManager.class));
@@ -231,16 +233,19 @@ class BriarReportCollector {
 			boolean wifiAvailable = wifi != null && wifi.isAvailable();
 			connectivityInfo.add("WifiAvailable", wifiAvailable);
 
+			// Is wifi connected?
+			boolean wifiConnected = wifi != null && wifi.isConnected();
+			connectivityInfo.add("WifiConnected", wifiConnected);
+		} catch (SecurityException e) {
+			connectivityInfo.add("ConnectivityManagerException", e.toString());
+		}
+
 		// Is wifi enabled?
 		WifiManager wm = getSystemService(ctx, WifiManager.class);
 		boolean wifiEnabled = wm != null &&
 				wm.getWifiState() == WIFI_STATE_ENABLED;
 		connectivityInfo.add("WifiEnabled", wifiEnabled);
 
-		// Is wifi connected?
-		boolean wifiConnected = wifi != null && wifi.isConnected();
-		connectivityInfo.add("WifiConnected", wifiConnected);
-
 		// Is wifi direct supported?
 		boolean wifiDirect = ctx.getSystemService(WIFI_P2P_SERVICE) != null;
 		connectivityInfo.add("WiFiDirectSupported", wifiDirect);