func InjectPacket(pp *PacketParams, g *graph.Graph) error {
	srcdata := pp.SrcNode.Metadata()
	dstdata := pp.DstNode.Metadata()

	if _, ok := srcdata["IPV4"]; !ok {
		return errors.New("Source Node doesn't have an IP")
	}

	srcIP := getIP(srcdata["IPV4"].(string))
	if srcIP == nil {
		return errors.New("Source Node doesn't have proper IP")
	}

	if _, ok := dstdata["IPV4"]; !ok {
		return errors.New("Destination Node doesn't have an IP")
	}

	dstIP := getIP(dstdata["IPV4"].(string))
	if dstIP == nil {
		return errors.New("Destination Node doesn't have proper IP")
	}

	srcMAC, err := net.ParseMAC(srcdata["MAC"].(string))
	if err != nil || srcMAC == nil {
		return errors.New("Source Node doesn't have proper MAC")
	}

	dstMAC, err := net.ParseMAC(dstdata["MAC"].(string))
	if err != nil || dstMAC == nil {
		return errors.New("Destination Node doesn't have proper MAC")
	}

	//create packet
	buffer := gopacket.NewSerializeBuffer()
	ipLayer := &layers.IPv4{Version: 4, SrcIP: srcIP, DstIP: dstIP}
	ethLayer := &layers.Ethernet{EthernetType: layers.EthernetTypeIPv4, SrcMAC: srcMAC, DstMAC: dstMAC}

	switch pp.Type {
	case "icmp":
		ipLayer.Protocol = layers.IPProtocolICMPv4
		gopacket.SerializeLayers(buffer, options,
			ethLayer,
			ipLayer,
			&layers.ICMPv4{
				TypeCode: layers.CreateICMPv4TypeCode(layers.ICMPv4TypeEchoRequest, 0),
			},
			gopacket.Payload([]byte(pp.Payload)),
		)
	default:
		return fmt.Errorf("Unsupported traffic type '%s'", pp.Type)
	}

	g.RLock()

	srcNode := g.GetNode(pp.SrcNode.ID)
	if srcNode == nil {
		g.RUnlock()
		return errors.New("Unable to find source node")
	}

	nscontext, err := topology.NewNetNSContextByNode(g, srcNode)
	defer nscontext.Close()

	g.RUnlock()

	if err != nil {
		return err
	}

	handle, err := pcap.OpenLive(srcdata["Name"].(string), 1024, false, 2000)
	if err != nil {
		return fmt.Errorf("Unable to open the source node: %s", err.Error())
	}
	defer handle.Close()

	packet := buffer.Bytes()
	for i := 0; i < pp.Count; i++ {
		if err := handle.WritePacketData(packet); err != nil {
			return fmt.Errorf("Write error: %s", err.Error())
		}
	}

	return nil
}
Exemple #2
0
func (p *GoPacketProbe) run(g *graph.Graph, n *graph.Node, capture *api.Capture) error {
	atomic.StoreInt64(&p.state, common.RunningState)

	g.RLock()
	ifName := n.Metadata()["Name"].(string)
	firstLayerType := getGoPacketFirstLayerType(n)

	nscontext, err := topology.NewNetNSContextByNode(g, n)
	g.RUnlock()

	defer nscontext.Close()

	if err != nil {
		return err
	}

	switch capture.Type {
	case "pcap":
		handle, err := pcap.OpenLive(ifName, snaplen, true, time.Second)
		if err != nil {
			return fmt.Errorf("Error while opening device %s: %s", ifName, err.Error())
		}

		if err := handle.SetBPFFilter(capture.BPFFilter); err != nil {
			return fmt.Errorf("BPF Filter failed: %s", err)
		}

		p.handle = handle
		p.packetSource = gopacket.NewPacketSource(handle, handle.LinkType())

		logging.GetLogger().Infof("PCAP Capture started on %s with First layer: %s", ifName, firstLayerType)
	default:
		var handle *AFPacketHandle
		fnc := func() error {
			handle, err = NewAFPacketHandle(ifName, snaplen)
			if err != nil {
				return fmt.Errorf("Error while opening device %s: %s", ifName, err.Error())
			}
			return nil
		}

		if err = common.Retry(fnc, 2, 100*time.Millisecond); err != nil {
			return err
		}

		p.handle = handle
		p.packetSource = gopacket.NewPacketSource(handle, firstLayerType)

		logging.GetLogger().Infof("AfPacket Capture started on %s with First layer: %s", ifName, firstLayerType)
	}

	// leave the namespace, stay lock in the current thread
	nscontext.Quit()

	packetsChan := p.flowTable.Start()
	defer p.flowTable.Stop()

	p.feedFlowTable(packetsChan)

	return nil
}