package main

import (
        "flag"
        "log"
        "net"
)

var (
        ifaceFlag = flag.String("i", "ib0", "network interface name")
)

func main() {
        ifi, err := net.InterfaceByName(*ifaceFlag)
        if err != nil {
                log.Fatal(err)
        }

        log.Printf("%s: %s", ifi.Name, ifi.HardwareAddr)

        mac, err := net.ParseMAC(ifi.HardwareAddr.String())
        if err != nil {
                log.Fatal(err)
        }

        log.Println("%s: %s", ifi.Name, mac)
}