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// Command eui64 provides a simple utility to convert an IPv6 address to an
// IPv6 prefix and MAC address, or to convert an IPv6 prefix and MAC address
// to an IPv6 address.
package main
import (
"flag"
"fmt"
"log"
"net"
"github.com/mdlayher/netx/eui64"
)
var (
ipFlag = flag.String("ip", "fe80::", "IPv6 address or IPv6 prefix to parse")
macFlag = flag.String("mac", "", "EUI-48 or EUI-64 MAC address to parse")
)
func main() {
flag.Parse()
// IP flag required for both operations.
ip := net.ParseIP(*ipFlag)
if ip == nil {
log.Fatalf("invalid IP address: %s", *ipFlag)
}
// Attempt to parse prefix and MAC address from an IPv6 address.
if *ipFlag != "" && *macFlag == "" {
prefix, mac, err := eui64.ParseIP(ip)
if err != nil {
log.Fatal(err)
}
fmt.Printf("Prefix: %s\n MAC: %s\n", prefix, mac)
return
}
// Attempt to parse IPv6 address from IPv6 prefix and MAC address.
mac, err := net.ParseMAC(*macFlag)
if err != nil {
log.Fatal(err)
}
outIP, err := eui64.ParseMAC(ip, mac)
if err != nil {
log.Fatal(err)
}
fmt.Printf("IP: %s\n", outIP)
}
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