a simple example of how to grab a mac address in Golang.

macaddr.go

// getMacAddr gets the MAC hardware
// address of the host machine
func getMacAddr() (addr string) {
	interfaces, err := net.Interfaces()
	if err == nil {
		for _, i := range interfaces {
			if i.Flags&net.FlagUp != 0 && bytes.Compare(i.HardwareAddr, nil) != 0 {
				// Don't use random as we have a real address
				addr = i.HardwareAddr.String()
				break
			}
		}
	}
	return
}