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// Command rfc4193 generates a Unique Local IPv6 Unicast Address prefix, as
// described in RFC4193.
package main
import (
"bytes"
"flag"
"fmt"
"log"
"net"
"os"
"github.com/mdlayher/netx/rfc4193"
)
func main() {
flag.Parse()
ll := log.New(os.Stderr, "", 0)
// If an argument is passed, parse it as a RFC4193 prefix.
if s := flag.Arg(0); s != "" {
p, err := rfc4193.Parse(s)
if err != nil {
ll.Fatalf("failed to parse: %v", err)
}
size, _ := p.IPNet().Mask.Size()
fmt.Printf("local: %v, global ID: %#0x, subnet ID: %#04x, prefix: /%d\n",
p.Local, p.GlobalID, p.SubnetID, size)
return
}
ifis, err := net.Interfaces()
if err != nil {
ll.Fatalf("failed to get network interfaces: %v", err)
}
// Try to choose a suitable interface MAC address as a seed, but also fall
// back to random data (nil mac input) if a suitable address isn't found.
var mac net.HardwareAddr
for _, ifi := range ifis {
// Must be Ethernet address, must be non-zero (skip loopback).
if len(ifi.HardwareAddr) != 6 || bytes.Equal(ifi.HardwareAddr, make([]byte, 6)) {
continue
}
mac = ifi.HardwareAddr
break
}
p, err := rfc4193.Generate(mac)
if err != nil {
ll.Fatalf("failed to generate RFC4193 prefix: %v", err)
}
fmt.Println(p)
}
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