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| package main
import (
"flag"
"log"
"net"
"github.com/mdlayher/arp"
)
type cliFlag struct {
Ifname string
Debug bool
}
func main() {
var cli cliFlag
flag.StringVar(&cli.Ifname, "i", "vlan1000", "Proxy Arp interface name")
flag.BoolVar(&cli.Debug, "v", false, "show verbose informations")
flag.Parse()
ifname, err := net.InterfaceByName(cli.Ifname)
if err != nil {
log.Fatalln("get interface by name: ", err)
}
client, _ := arp.Dial(ifname)
for {
arp_recv, _, err := client.Read()
if err != nil {
log.Fatalln("read packets error: ", err)
}
if cli.Debug {
log.Println("recv arp: ", arp_recv)
}
arp_replay, err := arp.NewPacket(arp.OperationReply, ifname.HardwareAddr, arp_recv.TargetIP, arp_recv.SenderHardwareAddr, arp_recv.SenderIP)
if err != nil {
log.Fatalln("create packets error: ", err)
}
destinationMAC := arp_recv.SenderHardwareAddr
err = client.WriteTo(arp_replay, destinationMAC)
if err != nil {
log.Fatalln("sent packet error: ", err)
}
if cli.Debug {
log.Println("sent arp: ", arp_replay)
}
}
}
|