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pipe.go
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pipe.go
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package utils
import (
"bytes"
"fmt"
"sync"
"github.com/netsampler/goflow2/v2/decoders/netflow"
"github.com/netsampler/goflow2/v2/decoders/netflowlegacy"
"github.com/netsampler/goflow2/v2/decoders/sflow"
"github.com/netsampler/goflow2/v2/decoders/utils"
"github.com/netsampler/goflow2/v2/format"
"github.com/netsampler/goflow2/v2/producer"
"github.com/netsampler/goflow2/v2/transport"
"github.com/netsampler/goflow2/v2/utils/templates"
)
type FlowPipe interface {
DecodeFlow(msg interface{}) error
Close()
}
type flowpipe struct {
format format.FormatInterface
transport transport.TransportInterface
producer producer.ProducerInterface
netFlowTemplater templates.TemplateSystemGenerator
}
type PipeConfig struct {
Format format.FormatInterface
Transport transport.TransportInterface
Producer producer.ProducerInterface
NetFlowTemplater templates.TemplateSystemGenerator
}
func (p *flowpipe) formatSend(flowMessageSet []producer.ProducerMessage) error {
for _, msg := range flowMessageSet {
// todo: pass normal
if p.format != nil {
key, data, err := p.format.Format(msg)
if err != nil {
return err
}
if p.transport != nil {
if err = p.transport.Send(key, data); err != nil {
return err
}
}
// send to pool for reuse
}
}
return nil
}
func (p *flowpipe) parseConfig(cfg *PipeConfig) {
p.format = cfg.Format
p.transport = cfg.Transport
p.producer = cfg.Producer
if cfg.NetFlowTemplater != nil {
p.netFlowTemplater = cfg.NetFlowTemplater
} else {
p.netFlowTemplater = templates.DefaultTemplateGenerator
}
}
type SFlowPipe struct {
flowpipe
}
type NetFlowPipe struct {
flowpipe
templateslock *sync.RWMutex
templates map[string]netflow.NetFlowTemplateSystem
}
type PipeMessageError struct {
Message *Message
Err error
}
func (e *PipeMessageError) Error() string {
return fmt.Sprintf("message from %s %s", e.Message.Src.String(), e.Err.Error())
}
func (e *PipeMessageError) Unwrap() error {
return e.Err
}
func NewSFlowPipe(cfg *PipeConfig) *SFlowPipe {
p := &SFlowPipe{}
p.parseConfig(cfg)
return p
}
func (p *SFlowPipe) Close() {
}
func (p *SFlowPipe) DecodeFlow(msg interface{}) error {
pkt, ok := msg.(*Message)
if !ok {
return fmt.Errorf("flow is not *Message")
}
buf := bytes.NewBuffer(pkt.Payload)
//key := pkt.Src.String()
var packet sflow.Packet
if err := sflow.DecodeMessageVersion(buf, &packet); err != nil {
return &PipeMessageError{pkt, err}
}
args := producer.ProduceArgs{
Src: pkt.Src,
Dst: pkt.Dst,
TimeReceived: pkt.Received,
SamplerAddress: pkt.Src.Addr(),
}
if p.producer == nil {
return nil
}
flowMessageSet, err := p.producer.Produce(&packet, &args)
defer p.producer.Commit(flowMessageSet)
if err != nil {
return &PipeMessageError{pkt, err}
}
return p.formatSend(flowMessageSet)
}
func NewNetFlowPipe(cfg *PipeConfig) *NetFlowPipe {
p := &NetFlowPipe{
templateslock: &sync.RWMutex{},
templates: make(map[string]netflow.NetFlowTemplateSystem),
}
p.parseConfig(cfg)
return p
}
func (p *NetFlowPipe) DecodeFlow(msg interface{}) error {
pkt, ok := msg.(*Message)
if !ok {
return fmt.Errorf("flow is not *Message")
}
buf := bytes.NewBuffer(pkt.Payload)
key := pkt.Src.String()
p.templateslock.RLock()
templates, ok := p.templates[key]
p.templateslock.RUnlock()
if !ok {
templates = p.netFlowTemplater(key)
p.templateslock.Lock()
p.templates[key] = templates
p.templateslock.Unlock()
}
var packetV5 netflowlegacy.PacketNetFlowV5
var packetNFv9 netflow.NFv9Packet
var packetIPFIX netflow.IPFIXPacket
// decode the version
var version uint16
if err := utils.BinaryDecoder(buf, &version); err != nil {
return &PipeMessageError{pkt, err}
}
switch version {
case 5:
packetV5.Version = 5
if err := netflowlegacy.DecodeMessage(buf, &packetV5); err != nil {
return &PipeMessageError{pkt, err}
}
case 9:
packetNFv9.Version = 9
if err := netflow.DecodeMessageNetFlow(buf, templates, &packetNFv9); err != nil {
return &PipeMessageError{pkt, err}
}
case 10:
packetIPFIX.Version = 10
if err := netflow.DecodeMessageIPFIX(buf, templates, &packetIPFIX); err != nil {
return &PipeMessageError{pkt, err}
}
default:
return &PipeMessageError{pkt, fmt.Errorf("not a NetFlow packet")}
}
var flowMessageSet []producer.ProducerMessage
var err error
args := producer.ProduceArgs{
Src: pkt.Src,
Dst: pkt.Dst,
TimeReceived: pkt.Received,
SamplerAddress: pkt.Src.Addr(),
}
if p.producer == nil {
return nil
}
switch version {
case 5:
flowMessageSet, err = p.producer.Produce(&packetV5, &args)
case 9:
flowMessageSet, err = p.producer.Produce(&packetNFv9, &args)
case 10:
flowMessageSet, err = p.producer.Produce(&packetIPFIX, &args)
}
defer p.producer.Commit(flowMessageSet)
if err != nil {
return &PipeMessageError{pkt, err}
}
return p.formatSend(flowMessageSet)
}
func (p *NetFlowPipe) Close() {
}
type AutoFlowPipe struct {
*SFlowPipe
*NetFlowPipe
}
func NewFlowPipe(cfg *PipeConfig) *AutoFlowPipe {
p := &AutoFlowPipe{
SFlowPipe: NewSFlowPipe(cfg),
NetFlowPipe: NewNetFlowPipe(cfg),
}
return p
}
func (p *AutoFlowPipe) Close() {
p.SFlowPipe.Close()
p.NetFlowPipe.Close()
}
func (p *AutoFlowPipe) DecodeFlow(msg interface{}) error {
pkt, ok := msg.(*Message)
if !ok {
return fmt.Errorf("flow is not *Message")
}
buf := bytes.NewBuffer(pkt.Payload)
var proto uint32
if err := utils.BinaryDecoder(buf, &proto); err != nil {
return &PipeMessageError{pkt, err}
}
protoNetFlow := (proto & 0xFFFF0000) >> 16
if proto == 5 {
return p.SFlowPipe.DecodeFlow(msg)
} else if protoNetFlow == 5 || protoNetFlow == 9 || protoNetFlow == 10 {
return p.NetFlowPipe.DecodeFlow(msg)
}
return fmt.Errorf("could not identify protocol %d", proto)
}