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Added option to check sender's MX records

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M66B
2019-07-16 14:44:21 +02:00
parent 4fb3f3c638
commit b8203fe0f0
10 changed files with 1935 additions and 44 deletions
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31
app/src/main/java/eu/faircode/email/ConnectionHelper.java
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@@ -17,7 +17,13 @@ import com.bugsnag.android.BreadcrumbType;
import com.bugsnag.android.Bugsnag;
import com.sun.mail.imap.IMAPStore;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.TextParseException;
import org.xbill.DNS.Type;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
@@ -25,7 +31,10 @@ import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.mail.Address;
import javax.mail.MessagingException;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
public class ConnectionHelper {
// https://dns.watch/
@@ -308,4 +317,26 @@ public class ConnectionHelper {
else
return dns.get(0).getHostAddress();
}
static void lookup(Address[] addresses, Context context) throws AddressException, TextParseException, UnknownHostException {
if (addresses != null)
for (Address address : addresses) {
String email = ((InternetAddress) address).getAddress();
if (email == null || !email.contains("@"))
throw new AddressException(email);
String domain = email.split("@")[1];
Lookup lookup = new Lookup(domain, Type.MX);
SimpleResolver resolver = new SimpleResolver(ConnectionHelper.getDnsServer(context));
lookup.setResolver(resolver);
Log.i("Lookup MX=" + domain + " @" + resolver.getAddress());
lookup.run();
if (lookup.getResult() == Lookup.HOST_NOT_FOUND ||
lookup.getResult() == Lookup.TYPE_NOT_FOUND) {
Log.i("Lookup MX=" + domain + " result=" + lookup.getErrorString());
throw new IllegalArgumentException(context.getString(R.string.title_no_server, domain));
}
}
}
}