SIN_PROXY
sin->sin_other = SIN_PROXY;
if (sina->sin_other & SIN_PROXY) {
if (sin_m.sin_other & SIN_PROXY) {
sin_m.sin_other = SIN_PROXY;
sin_m.sin_other = SIN_PROXY;
if (sina->sin_other & SIN_PROXY)
sin_m.sin_other = SIN_PROXY;