forked from aregm/nff-go
/
gopacketParserExample.go
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/
gopacketParserExample.go
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// Copyright 2017 Intel Corporation.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"flag"
"fmt"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/intel-go/nff-go/flow"
"github.com/intel-go/nff-go/packet"
)
var (
printOn bool
)
func main() {
flag.BoolVar(&printOn, "print", false, "enable print of parsed layers")
outport := flag.Uint("outport", 1, "port for sender")
inport := flag.Uint("inport", 0, "port for receiver")
noscheduler := flag.Bool("no-scheduler", false, "disable scheduler")
flag.Parse()
// Initialize NFF-GO library at 15 cores by default
config := flow.Config{
CPUList: "0-14",
DisableScheduler: *noscheduler,
}
flow.SystemInit(&config)
// Receive packets from zero port. One queue per receive will be added automatically.
firstFlow, err := flow.SetReceiver(uint16(*inport))
flow.CheckFatal(err)
var ctx gopacketContext
flow.CheckFatal(flow.SetHandler(firstFlow, gopacketHandleFunc, ctx))
flow.CheckFatal(flow.SetSender(firstFlow, uint16(*outport)))
flow.SystemStart()
}
// Parser and pre-allocated layers to be parsed.
type gopacketContext struct {
eth layers.Ethernet
ip4 layers.IPv4
ip6 layers.IPv6
tcp layers.TCP
udp layers.UDP
parser *gopacket.DecodingLayerParser
}
// Each handler will use its own gopacketContext.
func (ctx gopacketContext) Copy() interface{} {
newCtx := new(gopacketContext)
newCtx.parser = gopacket.NewDecodingLayerParser(layers.LayerTypeEthernet, &newCtx.eth, &newCtx.ip4, &newCtx.ip6, &newCtx.tcp, &newCtx.udp)
return newCtx
}
func (ctx gopacketContext) Delete() {
}
func gopacketHandleFunc(currentPacket *packet.Packet, context flow.UserContext) {
ctx := context.(*gopacketContext)
parser := ctx.parser
decoded := []gopacket.LayerType{}
packetData := currentPacket.GetRawPacketBytes()
parser.DecodeLayers(packetData, &decoded)
if printOn {
fmt.Println("--------- Packet----------")
printLayersInfo(ctx, decoded)
}
}
func printLayersInfo(ctx *gopacketContext, decoded []gopacket.LayerType) {
for _, layerType := range decoded {
switch layerType {
case layers.LayerTypeEthernet:
fmt.Println("Ethernet layer detected.")
fmt.Printf(" From %s to %s\n", ctx.eth.SrcMAC, ctx.eth.DstMAC)
fmt.Printf(" Protocol: %v\n", ctx.eth.EthernetType)
case layers.LayerTypeIPv4:
fmt.Println("IPv4 layer detected.")
fmt.Printf(" From %s to %s\n", ctx.ip4.SrcIP, ctx.ip4.DstIP)
fmt.Printf(" Protocol: %v\n", ctx.ip4.Protocol)
case layers.LayerTypeIPv6:
fmt.Println("IPv6 layer detected.")
fmt.Printf(" From %s to %s\n", ctx.ip6.SrcIP, ctx.ip6.DstIP)
fmt.Printf(" Protocol: %v\n", ctx.ip6.NextHeader)
case layers.LayerTypeTCP:
fmt.Println("TCP layer detected.")
fmt.Printf(" From port %d to %d\n", ctx.tcp.SrcPort, ctx.tcp.DstPort)
fmt.Printf(" Sequence number: %d\n", ctx.tcp.Seq)
case layers.LayerTypeUDP:
fmt.Println("UDP layer detected.")
fmt.Printf(" From port %d to %d\n", ctx.udp.SrcPort, ctx.udp.DstPort)
}
}
}