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Diffstat (limited to 'src/main/java/de/pixart/messenger/utils/AndroidUsingLinkProperties.java')
-rw-r--r--src/main/java/de/pixart/messenger/utils/AndroidUsingLinkProperties.java90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/main/java/de/pixart/messenger/utils/AndroidUsingLinkProperties.java b/src/main/java/de/pixart/messenger/utils/AndroidUsingLinkProperties.java
new file mode 100644
index 000000000..f2f33dc1b
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/utils/AndroidUsingLinkProperties.java
@@ -0,0 +1,90 @@
+package de.pixart.messenger.utils;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.LinkProperties;
+import android.net.Network;
+import android.net.NetworkInfo;
+import android.net.RouteInfo;
+import android.os.Build;
+
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.util.ArrayList;
+import java.util.List;
+
+import de.measite.minidns.dnsserverlookup.AbstractDNSServerLookupMechanism;
+import de.measite.minidns.dnsserverlookup.AndroidUsingExec;
+
+public class AndroidUsingLinkProperties extends AbstractDNSServerLookupMechanism {
+
+ private final Context context;
+
+ AndroidUsingLinkProperties(Context context) {
+ super(AndroidUsingLinkProperties.class.getSimpleName(), AndroidUsingExec.PRIORITY - 1);
+ this.context = context;
+ }
+
+ @Override
+ public boolean isAvailable() {
+ return Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP;
+ }
+
+ @Override
+ @TargetApi(21)
+ public String[] getDnsServerAddresses() {
+ final ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+ final Network[] networks = connectivityManager == null ? null : connectivityManager.getAllNetworks();
+ if (networks == null) {
+ return new String[0];
+ }
+ final Network activeNetwork = getActiveNetwork(connectivityManager);
+ final List<String> servers = new ArrayList<>();
+ int vpnOffset = 0;
+ for (Network network : networks) {
+ LinkProperties linkProperties = connectivityManager.getLinkProperties(network);
+ if (linkProperties == null) {
+ continue;
+ }
+ final NetworkInfo networkInfo = connectivityManager.getNetworkInfo(network);
+ final boolean isActiveNetwork = network.equals(activeNetwork);
+ final boolean isVpn = networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_VPN;
+ if (isActiveNetwork && isVpn) {
+ final List<String> tmp = getIPv4First(linkProperties.getDnsServers());
+ servers.addAll(0, tmp);
+ vpnOffset += tmp.size();
+ } else if (hasDefaultRoute(linkProperties) || isActiveNetwork || activeNetwork == null || isVpn) {
+ servers.addAll(vpnOffset, getIPv4First(linkProperties.getDnsServers()));
+ }
+ }
+ return servers.toArray(new String[0]);
+ }
+
+ @TargetApi(23)
+ private static Network getActiveNetwork(ConnectivityManager cm) {
+ return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ? cm.getActiveNetwork() : null;
+ }
+
+ private static List<String> getIPv4First(List<InetAddress> in) {
+ List<String> out = new ArrayList<>();
+ for (InetAddress address : in) {
+ if (address instanceof Inet4Address) {
+ out.add(0, address.getHostAddress());
+ } else {
+ out.add(address.getHostAddress());
+ }
+ }
+ return out;
+ }
+
+ @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+ private static boolean hasDefaultRoute(LinkProperties linkProperties) {
+ for (RouteInfo route : linkProperties.getRoutes()) {
+ if (route.isDefaultRoute()) {
+ return true;
+ }
+ }
+ return false;
+ }
+} \ No newline at end of file