pfctl_get_states_h
error = pfctl_get_states_h(&h, filter, f, arg);
int pfctl_get_states_h(struct pfctl_handle *h, struct pfctl_state_filter *filter, pfctl_get_state_fn f, void *arg);
if (pfctl_get_states_h(pfh, &filter, pfctl_show_state, &arg))