Go1.8抓取网络数据包

//需要安装libcap-devel包package main//+build linuximport (    "fmt"    "github.com/google/gopacket"    "github.com/google/gopacket/pcap")func main() {    // 指定监听的网络为eth0,每次捕获消息大小,是否已混合模式打开,    if handle, err := pcap.OpenLive("eth0", 1600, true, pcap.BlockForever); err == nil {        //设置过滤规则,即端口为80,如果指定协议则:tcp and port 80        err = handle.SetBPFFilter("port 80")        if err != nil {            fmt.Println(err)            return        }        source := gopacket.NewPacketSource(handle, handle.LinkType())        for v := range source.Packets() {            //判断数据包是否是Payload如果是则打印,            if payload := v.Layer(gopacket.LayerTypePayload); payload != nil {                fmt.Println(string(payload.LayerContents()))            }        }    }}