mirror of https://github.com/M66B/FairEmail.git
M66B
5 years ago
parent
c239a1245d
commit
f1e9b23a96
@ -0,0 +1,175 @@
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package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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FairEmail is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2020 by Marcel Bokhorst (M66B)
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*/
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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.NetworkInfo;
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import android.os.Build;
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import androidx.annotation.NonNull;
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import org.xbill.DNS.Lookup;
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import org.xbill.DNS.MXRecord;
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import org.xbill.DNS.Record;
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import org.xbill.DNS.SimpleResolver;
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import org.xbill.DNS.TextParseException;
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import org.xbill.DNS.Type;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.List;
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import javax.mail.Address;
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import javax.mail.internet.InternetAddress;
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public class DNSHelper {
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// https://dns.watch/
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private static final String DEFAULT_DNS = "84.200.69.80";
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static boolean lookupMx(Context context, Address[] addresses) throws UnknownHostException {
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boolean ok = true;
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if (addresses != null)
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for (Address address : addresses)
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try {
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String email = ((InternetAddress) address).getAddress();
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if (email == null)
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continue;
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int d = email.lastIndexOf("@");
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if (d < 0)
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continue;
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String domain = email.substring(d + 1);
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Lookup lookup = new Lookup(domain, Type.MX);
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SimpleResolver resolver = new SimpleResolver(getDnsServer(context));
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lookup.setResolver(resolver);
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Log.i("Lookup MX=" + domain + " @" + resolver.getAddress());
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lookup.run();
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if (lookup.getResult() == Lookup.HOST_NOT_FOUND ||
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lookup.getResult() == Lookup.TYPE_NOT_FOUND) {
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Log.i("Lookup MX=" + domain + " result=" + lookup.getErrorString());
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throw new UnknownHostException(context.getString(R.string.title_no_server, domain));
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} else if (lookup.getResult() != Lookup.SUCCESSFUL)
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ok = false;
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} catch (UnknownHostException ex) {
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throw ex;
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} catch (Throwable ex) {
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Log.e(ex);
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ok = false;
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}
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return ok;
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}
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static InetAddress lookupMx(Context context, String domain) {
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try {
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Lookup lookup = new Lookup(domain, Type.MX);
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SimpleResolver resolver = new SimpleResolver(getDnsServer(context));
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lookup.setResolver(resolver);
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Log.i("Lookup MX=" + domain + " @" + resolver.getAddress());
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lookup.run();
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if (lookup.getResult() == Lookup.SUCCESSFUL) {
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Record[] answers = lookup.getAnswers();
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if (answers != null && answers.length > 0 && answers[0] instanceof MXRecord) {
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MXRecord mx = (MXRecord) answers[0];
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return InetAddress.getByName(mx.getTarget().toString(true));
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}
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}
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} catch (Throwable ex) {
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Log.w(ex);
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}
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return null;
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}
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@NonNull
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static Record[] lookup(Context context, String name, int type) throws TextParseException, UnknownHostException {
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Lookup lookup = new Lookup(name, type);
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SimpleResolver resolver = new SimpleResolver(getDnsServer(context));
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lookup.setResolver(resolver);
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Log.i("Lookup name=" + name + " @" + resolver.getAddress() + " type=" + type);
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Record[] records = lookup.run();
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if (lookup.getResult() != Lookup.SUCCESSFUL)
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if (lookup.getResult() == Lookup.HOST_NOT_FOUND ||
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lookup.getResult() == Lookup.TYPE_NOT_FOUND)
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throw new UnknownHostException(name);
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else
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throw new UnknownHostException(lookup.getErrorString());
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if (records.length == 0)
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throw new UnknownHostException(name);
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for (Record record : records)
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Log.i("Found record=" + record);
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return records;
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}
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static String getParentDomain(String host) {
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if (host != null) {
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String[] h = host.split("\\.");
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if (h.length >= 2)
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return h[h.length - 2] + "." + h[h.length - 1];
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}
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return host;
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}
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private static String getDnsServer(Context context) {
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ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
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if (cm == null)
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return DEFAULT_DNS;
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LinkProperties props = null;
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if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
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for (Network network : cm.getAllNetworks()) {
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NetworkInfo ni = cm.getNetworkInfo(network);
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if (ni != null && ni.isConnected()) {
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props = cm.getLinkProperties(network);
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Log.i("Old props=" + props);
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break;
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}
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}
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else {
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Network active = cm.getActiveNetwork();
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if (active == null)
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return DEFAULT_DNS;
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props = cm.getLinkProperties(active);
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Log.i("New props=" + props);
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}
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if (props == null)
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return DEFAULT_DNS;
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List<InetAddress> dns = props.getDnsServers();
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if (dns.size() == 0)
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return DEFAULT_DNS;
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else
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return dns.get(0).getHostAddress();
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}
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}
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