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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net/netip"
"os"
"github.com/ttl256/dygn/internal/hwaddr"
)
func NewPrefix(prefix netip.Prefix, mac hwaddr.MAC) netip.Addr {
eui64 := hwaddr.EUIFrom6(mac)
addr := eui64.AppendToPrefixAddr(prefix.Addr().As16())
return netip.AddrFrom16(addr)
}
func main() {
var macAddr *hwaddr.MAC
var prefix *netip.Prefix
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s:\n", os.Args[0])
flag.PrintDefaults()
}
flag.Func(
"mac", "MAC address\nAny format will do: xx:xx:xx:xx:xx:xx, xx-xx-xx-xx-xx-xx, xxxx.xxxx.xxxx, xxxxxxxxxxxx",
func(s string) error {
addr, err := hwaddr.ParseAddr(s)
if err != nil {
return err
}
macAddr = &addr
return nil
})
flag.Func("prefix", "IPv6 prefix of prefix-length 64", func(s string) error {
p, err := netip.ParsePrefix(s)
if err != nil {
return err
}
prefix = &p
return nil
})
flag.Parse()
if macAddr == nil || prefix == nil {
flag.Usage()
os.Exit(1)
}
fmt.Println(NewPrefix(*prefix, *macAddr))
}