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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package routing | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "net" | ||
| "os/exec" | ||
| "strings" | ||
| "time" | ||
| ) | ||
|
|
||
| var ( | ||
| GatewayMac = make(map[string]net.HardwareAddr) | ||
| ) | ||
|
|
||
| func GetGatewayMac(gateway string) (net.HardwareAddr, error) { | ||
| if IP, ok := GatewayMac[gateway]; ok { | ||
| return IP, nil | ||
| } | ||
|
|
||
| ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second) | ||
| defer cancel() | ||
|
|
||
| cmd := exec.CommandContext(ctx, "arp", "-n", gateway) | ||
| output, err := cmd.CombinedOutput() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| for _, part := range strings.Fields(string(output)) { | ||
| mc, err := net.ParseMAC(part) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| GatewayMac[gateway] = mc | ||
| return mc, nil | ||
| } | ||
|
|
||
| return nil, errors.New("gateway mac not found") | ||
| } |
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