在專案中,我們需要知道哪些IP是可用IP,這時候想到了用ICMP(Internet控制訊息協定)。可以使用開源函式庫–github.com/sparrc/go-ping來判斷是否能ping通。
使用–github.com/sparrc/go-ping開源庫判斷是否能ping通的程式碼:
func ServerPing(target string) bool { pinger, err := ping.NewPinger(target) if err != nil { panic(err) } pinger.Count = ICMPCOUNT pinger.Timeout = time.Duration(PINGTIME*time.Millisecond) pinger.SetPrivileged(true) pinger.Run()// blocks until finished stats := pinger.Statistics() fmt.Println(stats) // 有回包,就是说明IP是可用的 if stats.PacketsRecv >= 1 { return true } return false }
這裡是透過回包數量來判斷的,也可以透過掉包率來判斷。同時,該庫提供了Statistics結構體,包含了詳細的ICMP信息,如下
type Statistics struct { // PacketsRecv is the number of packets received. PacketsRecv int // PacketsSent is the number of packets sent. PacketsSent int // PacketLoss is the percentage of packets lost. PacketLoss float64 // IPAddr is the address of the host being pinged. IPAddr *net.IPAddr // Addr is the string address of the host being pinged. Addr string // Rtts is all of the round-trip times sent via this pinger. Rtts []time.Duration // MinRtt is the minimum round-trip time sent via this pinger. MinRtt time.Duration // MaxRtt is the maximum round-trip time sent via this pinger. MaxRtt time.Duration // AvgRtt is the average round-trip time sent via this pinger. AvgRtt time.Duration // StdDevRtt is the standard deviation of the round-trip times sent via // this pinger. StdDevRtt time.Duration }
golang教程欄。
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