77 lines
2.5 KiB
Java
77 lines
2.5 KiB
Java
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package eu.siacs.conversations.utils;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.net.ConnectivityManager;
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import android.net.LinkProperties;
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import android.net.Network;
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import android.net.RouteInfo;
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import android.os.Build;
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import java.net.Inet4Address;
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import java.net.InetAddress;
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import java.util.ArrayList;
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import java.util.List;
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import de.measite.minidns.dnsserverlookup.AbstractDNSServerLookupMechanism;
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import de.measite.minidns.dnsserverlookup.AndroidUsingExec;
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public class AndroidUsingLinkProperties extends AbstractDNSServerLookupMechanism {
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private final Context context;
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protected AndroidUsingLinkProperties(Context context) {
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super(AndroidUsingLinkProperties.class.getSimpleName(), AndroidUsingExec.PRIORITY - 1);
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this.context = context;
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}
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@Override
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public boolean isAvailable() {
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return Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP;
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}
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@Override
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@TargetApi(21)
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public String[] getDnsServerAddresses() {
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ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
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Network[] networks = connectivityManager == null ? null : connectivityManager.getAllNetworks();
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if (networks == null) {
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return new String[0];
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}
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List<String> servers = new ArrayList<>();
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for(Network network : networks) {
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LinkProperties linkProperties = connectivityManager.getLinkProperties(network);
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if (linkProperties != null) {
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if (hasDefaultRoute(linkProperties)) {
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servers.addAll(0, getIPv4First(linkProperties.getDnsServers()));
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} else {
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servers.addAll(getIPv4First(linkProperties.getDnsServers()));
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}
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}
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}
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return servers.toArray(new String[servers.size()]);
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}
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private static List<String> getIPv4First(List<InetAddress> in) {
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List<String> out = new ArrayList<>();
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for(InetAddress addr : in) {
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if (addr instanceof Inet4Address) {
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out.add(0, addr.toString());
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} else {
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out.add(addr.toString());
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}
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}
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return out;
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}
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@TargetApi(Build.VERSION_CODES.LOLLIPOP)
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private static boolean hasDefaultRoute(LinkProperties linkProperties) {
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for(RouteInfo route: linkProperties.getRoutes()) {
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if (route.isDefaultRoute()) {
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return true;
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}
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}
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return false;
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}
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}
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