6、Go语言网络编程基础与实践

Go语言网络编程基础与实践

1. IP地址与子网掩码操作

在网络编程中，处理IP地址和子网掩码是基础操作。下面的Go代码展示了如何解析IP地址、获取默认子网掩码、计算网络地址等操作：

func main() {
    if len(os.Args) != 2 {
        log.Fatalln("Usage: %s dotted-ip-addr\n", os.Args[0])
    }
    dotAddr := os.Args[1]
    addr := net.ParseIP(dotAddr)
    if addr == nil {
        log.Fatalln("nil Invalid address")
    }
    mask := addr.DefaultMask()
    network := addr.Mask(mask)
    ones, bits := mask.Size()
    fmt.Println("Address is ", addr.String(),
        "\nDefault mask length is ", bits,
        "\nLeading ones count is ", ones,
        "\nMask is (hex) ", mask.String(),
        "\nNetwork is ", network.String())
    derivedMask := net.IPv4Mask(255, 255, 0, 0) // working on mask
    fmt.Printf("Network using