Filtered Search

[<CZa...@wi...>]

I'm trying to do a search for based on the filter below, for all entries in
the ldap service, but I am not getting output back.
Can anyone tell me what is incorrect here?

 $mesg = $ldap->search(
                                base => "o=Wiley",
                                scope => "subtree",
                                filter => "(&(sn=*) (givename=*) (mail=*))"
        );

                        foreach $entry ($mesg->entries) {

                                   $SN = $entry->get_value('sn');
                                   $GN = $entry->get_value('givenname');
                                    $M = $entry->get_value('mail');

     print "$GN $SN $M\m";