tlsext_sni_is_valid_hostname
if (!tlsext_sni_is_valid_hostname(&cbs, &is_ip)) {
if (!tlsext_sni_is_valid_hostname(&host_name, &is_ip)) {
int tlsext_sni_is_valid_hostname(CBS *cbs, int *is_ip);
if (tlsext_sni_is_valid_hostname(&cbs, &is_ip) != tst->valid) {
if (tlsext_sni_is_valid_hostname(&cbs, &is_ip)) {