capture_test.go

// Copyright 2012 Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
// +build linux,go1.9

package pcapgo_test

import (
	"log"
	"os"

	"github.com/google/gopacket"
	"github.com/google/gopacket/layers"
	"github.com/google/gopacket/pcapgo"
)

func Example_captureEthernet() {
	f, err := os.Create("/tmp/lo.pcap")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()
	pcapw := pcapgo.NewWriter(f)
	if err := pcapw.WriteFileHeader(1600, layers.LinkTypeEthernet); err != nil {
		log.Fatalf("WriteFileHeader: %v", err)
	}

	handle, err := pcapgo.NewEthernetHandle("lo")
	if err != nil {
		log.Fatalf("OpenEthernet: %v", err)
	}

	pkgsrc := gopacket.NewPacketSource(handle, layers.LayerTypeEthernet)
	for packet := range pkgsrc.Packets() {
		if err := pcapw.WritePacket(packet.Metadata().CaptureInfo, packet.Data()); err != nil {
			log.Fatalf("pcap.WritePacket(): %v", err)
		}
	}
}