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Lookup MX record for email domains

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M66B
2019-09-08 13:22:44 +02:00
parent d9d601ef4a
commit ab34587e3f
3 changed files with 40 additions and 12 deletions
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24
app/src/main/java/eu/faircode/email/ConnectionHelper.java
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@@ -14,6 +14,8 @@ import android.telephony.TelephonyManager;
import androidx.preference.PreferenceManager;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.MXRecord;
import org.xbill.DNS.Record;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.Type;
@@ -318,6 +320,28 @@ public class ConnectionHelper {
return ok;
}
static InetAddress lookupMx(String domain, Context context) {
try {
Lookup lookup = new Lookup(domain, Type.MX);
SimpleResolver resolver = new SimpleResolver(getDnsServer(context));
lookup.setResolver(resolver);
Log.i("Lookup MX=" + domain + " @" + resolver.getAddress());
lookup.run();
if (lookup.getResult() == Lookup.SUCCESSFUL) {
Record[] answers = lookup.getAnswers();
if (answers != null && answers.length > 0 && answers[0] instanceof MXRecord) {
MXRecord mx = (MXRecord) answers[0];
return InetAddress.getByName(mx.getTarget().toString(true));
}
}
} catch (Throwable ex) {
Log.w(ex);
}
return null;
}
static boolean isSameDomain(String host1, String host2) {
String domain1 = getDomain(host1);
String domain2 = getDomain(host2);