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import java.util.*;
import javax.naming.*;
import javax.naming.directory.*;
public class DnsSrv {
String getDomain(String name) throws NamingException {
DirContext context;
NameNotFoundException ret = null;
context = new InitialDirContext();
for ( ;; ) {
try {
Attributes attributes = context.getAttributes(
"dns:/_ldap._tcp.dc._msdcs." + name,
new String[] { "SRV" }
);
return name;
} catch (NameNotFoundException nnfe) {
ret = nnfe;
}
int dot = name.indexOf('.');
if (dot == -1)
break;
name = name.substring(dot + 1);
}
throw ret != null ? ret : new NamingException("invalid name");
}
public static void main(String argv[]) throws Exception {
DnsSrv dnsSrv = new DnsSrv();
System.out.println(dnsSrv.getDomain(argv[0]));
}
}
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