func scoreAddr(iface net.Interface, addr net.Addr) (int, net.IP) {
	var ip net.IP
	if netAddr, ok := addr.(*net.IPNet); ok {
		ip = netAddr.IP
	} else if netIP, ok := addr.(*net.IPAddr); ok {
		ip = netIP.IP
	} else {
		return -1, nil
	}

	var score int
	if ip.To4() != nil {
		score += 300
	}
	if iface.Flags&net.FlagLoopback == 0 && !ip.IsLoopback() {
		score += 100
		if iface.Flags&net.FlagUp != 0 {
			score += 100
		}
	}
	if isLocalMacAddr(iface.HardwareAddr) {
		score -= 50
	}
	return score, ip
}
func scoreAddr(iface net.Interface, addr net.Addr) (int, net.IP) {
	var ip net.IP
	if netAddr, ok := addr.(*net.IPNet); ok {
		ip = netAddr.IP
	} else if netIP, ok := addr.(*net.IPAddr); ok {
		ip = netIP.IP
	} else {
		return -1, nil
	}

	var score int
	if ip.To4() != nil {
		score += 300
	}
	if iface.Flags&net.FlagLoopback == 0 && !ip.IsLoopback() {
		score += 100
		if iface.Flags&net.FlagUp != 0 {
			score += 100
		}
	}
	if isLocalMacAddr(iface.HardwareAddr) {
		score -= 50
	}
	return score, ip
}
func scoreAddr ( iface net . Interface , addr net . Addr ) ( int , net . IP ) { var ip net . IP if netAddr , ok := addr . ( * net . IPNet ) ; ok { ip = netAddr . IP } else if netIP , ok := addr . ( * net . IPAddr ) ; ok { ip = netIP . IP } else { return - 1 , nil } var score int if ip . To4 ( ) != nil { score += 300 } if iface . Flags & net . FlagLoopback == 0 && ! ip . IsLoopback ( ) { score += 100 if iface . Flags & net . FlagUp != 0 { score += 100 } } if isLocalMacAddr ( iface . HardwareAddr ) { score -= 50 } return score , ip }
// scoreAddr scores how likely the given addr is to be a remote address and returns the
// IP to use when listening. Any address which receives a negative score should not be used.
// Scores are calculated as:
// -1 for any unknown IP addreseses.
// +300 for IPv4 addresses
// +100 for non-local addresses, extra +100 for "up" interaces.
scoreAddr scores how likely the given addr is to be a remote address and returns the IP to use when listening . Any address which receives a negative score should not be used . Scores are calculated as : - 1 for any unknown IP addreseses . + 300 for IPv4 addresses + 100 for non - local addresses extra + 100 for up interaces .