Golang - How to Get Local Mac and IP Address?

    //----------------------
    // Get the local machine IP address
    // https://www.socketloop.com/tutorials/golang-get-local-ip-and-mac-address
    //----------------------

    addrs, err := net.InterfaceAddrs()

    if err != nil {
        fmt.Println(err)
    }

    var currentIP, currentNetworkHardwareName string

    for _, address := range addrs {

        // check the address type and if it is not a loopback the display it
        // = GET LOCAL IP ADDRESS
        if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
            if ipnet.IP.To4() != nil {
                fmt.Println("Current IP address : ", ipnet.IP.String())
                currentIP = ipnet.IP.String()
            }
        }
    }

    fmt.Println("------------------------------")
    fmt.Println("We want the interface name that has the current IP address")
    fmt.Println("MUST NOT be binded to 127.0.0.1 ")
    fmt.Println("------------------------------")

    // get all the system's or local machine's network interfaces

    interfaces, _ := net.Interfaces()
    for _, interf := range interfaces {

        if addrs, err := interf.Addrs(); err == nil {
            for index, addr := range addrs {
                fmt.Println("[", index, "]", interf.Name, ">", addr)

                // only interested in the name with current IP address
                if strings.Contains(addr.String(), currentIP) {
                    fmt.Println("Use name : ", interf.Name)
                    currentNetworkHardwareName = interf.Name
                }
            }
        }
    }

    fmt.Println("------------------------------")

    // extract the hardware information base on the interface name
    // capture above
    netInterface, err := net.InterfaceByName(currentNetworkHardwareName)

    if err != nil {
        fmt.Println(err)
    }

    name := netInterface.Name
    macAddress := netInterface.HardwareAddr

    fmt.Println("Hardware name : ", name)
    fmt.Println("MAC address : ", macAddress)

    // verify if the MAC address can be parsed properly
    hwAddr, err := net.ParseMAC(macAddress.String())

    if err != nil {
        fmt.Println("No able to parse MAC address : ", err)
        os.Exit(-1)
    }

    fmt.Printf("Physical hardware address : %s \n", hwAddr.String())