//---------------------------------------------------------- ban an ip
func Ban(_ip net.IP) {
config := cfg.Get()
ban_time, err := strconv.Atoi(config["ban_time"])
if err != nil {
ban_time = DEFAULT_BAN_TIME
log.Println("cannot get ban_timeout from config", err)
}
intip := _ip2int(_ip)
// randomize the timeout, for effective DoS protection
ban := uint32(ban_time)
_banned_ips[intip] = time.Now().Unix() + int64(ban+helper.LCG()%ban)
}
//------------------------------------------------ 随机概率丢骰子
func Dice(probability float32) bool {
return helper.LCG() < uint32(probability*math.MaxUint32)
}