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check IPv4 gateway by resolving gateway MAC in underlay subnets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| 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) | ||
| } |