Golang Packet.Data方法代码示例

//if it is the input stream to local machine
func inputStream(packet gopacket.Packet, Srcaddr *metrics.Address, Destaddr *metrics.Address) {
	//get the instance from the list which has the reverse srcaddr and the destaddr
	respdetail := string(packet.Data())
	if glog.V(1) {
		glog.Info("the length of the list before extract element:", httpinstancelist.Len())
	}

	for element := httpinstancelist.Front(); element != nil; element = element.Next() {
		httpinstance := element.Value.(*metrics.HttpTransaction)
		isreverse := ifreverse(httpinstance, Srcaddr, Destaddr)
		if isreverse {
			httpinstance.Timereceive = time.Now()
			//the units of time is ms
			responsetime := httpinstance.Timereceive.Sub(httpinstance.Timesend).Seconds() * 1000
			httpinstance.Respondtime = responsetime
			//store the respond detail
			glog.Info("respond info:", respdetail)
			httpinstance.Packetdetail.Responddetail = respdetail
			if glog.V(0) {
				glog.Infof("Respond duration:%vms", responsetime)
				glog.Infof("Get the response: %v", httpinstance)
				//glog.Info("detail:", httpinstance.Packetdetail)

			}
			httpinstancelist.Remove(element)
			//??how to use generic to realize the push function of different type
			//jsoninfo, _ := json.Marshal(httpinstance)
			//the type should be the ip of this machine
			//the first parameter is index the second one is type
			//err := ESClient.Push(jsoninfo, "packetagent", localip)
			//measurement := "respondtime"
			glog.Info("send the respondtime measurement")
			err := Influxstorage.AddStats("type_packet", "abcde", httpinstance)
			if err != nil {
				glog.Info("error to push")
			}
			break
		}
	}

}

func handlePacket(packet gopacket.Packet) {
	var eth layers.Ethernet
	var ip4 layers.IPv4
	var udp layers.UDP
	var payload gopacket.Payload
	parser := gopacket.NewDecodingLayerParser(layers.LayerTypeEthernet, &eth, &ip4, &udp, &payload)
	decoded := []gopacket.LayerType{}

	err := parser.DecodeLayers(packet.Data(), &decoded)
	if err != nil {
		log.Printf("Decoding error:%v\n", err)
	}
	for _, layerType := range decoded {
		switch layerType {
		case layers.LayerTypeEthernet:
			fmt.Println("    Eth ", eth.SrcMAC, eth.DstMAC)
		case layers.LayerTypeIPv4:
			fmt.Println("    IP4 ", ip4.SrcIP, ip4.DstIP)
		case layers.LayerTypeUDP:
			fmt.Println("    UDP ", udp.SrcPort, udp.DstPort, payload.GoString())
		}

	}
}