duanlu5055 2016-01-08 08:42
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在Golang中将网络掩码号转换为32位

I am trying to get the IP address and subnet mask by

ifaces, err := net.Interfaces()
for _, iface := range ifaces{
        localip, _ = iface.Addrs()
}

However, I am looking forward to get the subnet as something like 255.255.255.0 rather than /24. How can I get that? If there are no modules that can do this, what is the logic to do this as a program?

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  • 普通网友 2016-01-08 09:58
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    Borrowed from some stackoverflow post itself, using logical operators.

    mask = (0xFFFFFFFF << (32 - 24)) & 0xFFFFFFFF; //24 is the netmask
    var dmask uint64
    dmask = 32
    localmask := make([]uint64, 0, 4)
    for i := 1; i <= 4; i++{
        tmp := mask >> (dmask - 8) & 0xFF
        localmask = append(localmask, tmp)
        dmask -= 8
    }
    
    fmt.Println(localmask)
    
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