golang判断ip是否在cidr

func IpContains(cidr string, ip string) bool {
    _, ipnet, err := net.ParseCIDR(cidr)
    if err != nil {
        return false
    }
    ipAddr := net.ParseIP(ip)
    return ipnet.Contains(ipAddr)
}
func TestIpContains(tt *testing.T) {
    fmt.Println(IpContains("192.168.1.0/24", "192.168.1.1"))
    fmt.Println(IpContains("192.168.1.0/24", "192.168.2.1"))
}