_asr_dname_from_fqdn
ssize_t _asr_dname_from_fqdn(const char *, char *, size_t);
if (_asr_dname_from_fqdn(dname, dn, sizeof(dn)) == -1)
if (_asr_dname_from_fqdn(fqdn, dname, sizeof(dname)) == -1) {