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arping.go
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/
arping.go
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package util
import (
"fmt"
"net"
"time"
"github.com/mdlayher/arp"
)
func Arping(nic, srcIP, dstIP string, timeout time.Duration, maxRetry int) (net.HardwareAddr, int, error) {
target := net.ParseIP(dstIP)
if target == nil {
return nil, 0, fmt.Errorf("%s is not a valid IP address", dstIP)
}
var count int
var err error
var ifi *net.Interface
for ; count < maxRetry; count++ {
if ifi, err = net.InterfaceByName(nic); err == nil {
break
}
time.Sleep(timeout)
}
if err != nil {
return nil, count, fmt.Errorf("failed to get interface %s: %v", nic, err)
}
var client *arp.Client
for ; count < maxRetry; count++ {
if client, err = arp.Dial(ifi); err == nil {
defer client.Close()
break
}
time.Sleep(timeout)
}
if err != nil {
return nil, count, fmt.Errorf("failed to set up ARP client: %v", err)
}
for ; count < maxRetry; count++ {
if err = client.SetDeadline(time.Now().Add(timeout)); err != nil {
continue
}
if mac, err := client.Resolve(target); err == nil {
return mac, count + 1, nil
}
}
return nil, count, fmt.Errorf("resolve MAC address of %s timeout: %v", dstIP, err)
}