func sflowFlowSampleSerialize(sf *layers.SFlowFlowSample, packets *[][]byte) []byte {
bufRec := new(bytes.Buffer)
for _, record := range sf.Records {
rec := record.(layers.SFlowRawPacketFlowRecord)
for _, payload := range *packets {
bufRec.Write(sflowRawPacketFlowRecordSerialize(&rec, &payload))
}
}
sf.SampleLength = uint32(bufRec.Len()) + 32
sf.RecordCount = uint32(len(*packets))
buf := new(bytes.Buffer)
binary.Write(buf, binary.BigEndian, ((uint32(sf.EnterpriseID) << 12) | (uint32(sf.Format))))
binary.Write(buf, binary.BigEndian, sf.SampleLength)
binary.Write(buf, binary.BigEndian, sf.SequenceNumber)
binary.Write(buf, binary.BigEndian, ((uint32(sf.SourceIDClass) << 30) | (uint32(sf.SourceIDIndex))))
binary.Write(buf, binary.BigEndian, sf.SamplingRate)
binary.Write(buf, binary.BigEndian, sf.SamplePool)
binary.Write(buf, binary.BigEndian, sf.Dropped)
binary.Write(buf, binary.BigEndian, sf.InputInterface)
binary.Write(buf, binary.BigEndian, sf.OutputInterface)
binary.Write(buf, binary.BigEndian, sf.RecordCount)
buf.Write(bufRec.Bytes())
return buf.Bytes()
}
func SFlowPackets(packets *[][]byte) []byte {
NbSFlowMsg++
sfraw := layers.SFlowRawPacketFlowRecord{
SFlowBaseFlowRecord: layers.SFlowBaseFlowRecord{
EnterpriseID: layers.SFlowStandard,
Format: layers.SFlowTypeRawPacketFlow,
// FlowDataLength uint32
},
HeaderProtocol: layers.SFlowProtoEthernet,
// FrameLength uint32
PayloadRemoved: 0,
// HeaderLength uint32
// Header gopacket.NewPacket
}
SFlowSampleSeq++
sf := layers.SFlowFlowSample{
EnterpriseID: layers.SFlowStandard,
Format: layers.SFlowTypeFlowSample,
// SampleLength uint32
SequenceNumber: uint32(SFlowSampleSeq),
SourceIDClass: layers.SFlowTypeSingleInterface,
SourceIDIndex: layers.SFlowSourceValue(47),
SamplingRate: 300,
SamplePool: 0x12345,
Dropped: 0,
InputInterface: 48,
OutputInterface: 47,
// RecordCount: 1,
// Records:
}
sf.Records = append(sf.Records, sfraw)
sf.RecordCount = uint32(len(sf.Records))
SFlowSeq++
sflowLayer := &layers.SFlowDatagram{
DatagramVersion: 5,
AgentAddress: net.IP{127, 0, 0, 3},
SubAgentID: 0,
SequenceNumber: uint32(SFlowSeq),
AgentUptime: 2294190,
// SampleCount: count,
// FlowSamples: sflowsamples,
// CounterSamples []SFlowCounterSample
}
sflowLayer.FlowSamples = append(sflowLayer.FlowSamples, sf)
sflowLayer.SampleCount = uint32(len(sflowLayer.FlowSamples))
rawBytes := SFlowDatagramSerialize(sflowLayer, packets)
return rawBytes
}