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优化抓包性能

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This commit is contained in:
hebo
2019-08-14 15:40:55 +08:00
parent dab225fc2c
commit d890396ba9
134 changed files with 3568 additions and 42049 deletions
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50
capture/network.go
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@@ -6,6 +6,10 @@ import (
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"golang.org/x/net/bpf"
// "github.com/google/gopacket/pcap"
"github.com/google/gopacket/pcapgo"
log "github.com/sirupsen/logrus"
"github.com/zr-hebo/sniffer-agent/model"
sd "github.com/zr-hebo/sniffer-agent/session-dealer"
@@ -32,6 +36,38 @@ func NewNetworkCard() (nc *networkCard) {
return &networkCard{name: DeviceName, listenPort: snifferPort}
}
func initEthernetHandler() (handler *pcapgo.EthernetHandle) {
// handler, err := pcap.OpenLive(DeviceName, 65535, false, pcap.BlockForever)
handler, err := pcapgo.NewEthernetHandle(DeviceName)
if err != nil {
panic(fmt.Sprintf("cannot open network interface %s <-- %s", DeviceName, err.Error()))
}
// set BPFFilter
pcapBPF, err := pcap.CompileBPFFilter(
layers.LinkTypeEthernet, 65535, fmt.Sprintf("tcp and (port %d)", snifferPort))
if err != nil {
panic(err.Error())
}
bpfIns := []bpf.RawInstruction{}
for _, ins := range pcapBPF {
bpfIns2 := bpf.RawInstruction{
Op: ins.Code,
Jt: ins.Jt,
Jf: ins.Jf,
K: ins.K,
}
bpfIns = append(bpfIns, bpfIns2)
}
err = handler.SetBPF(bpfIns)
if err != nil {
panic(err.Error())
}
return
}
// Listen get a connection.
func (nc *networkCard) Listen() (receiver chan model.QueryPiece) {
receiver = make(chan model.QueryPiece, 100)
@@ -41,17 +77,7 @@ func (nc *networkCard) Listen() (receiver chan model.QueryPiece) {
close(receiver)
}()
handler, err := pcap.OpenLive(DeviceName, 65535, false, pcap.BlockForever)
if err != nil {
panic(fmt.Sprintf("cannot open network interface %s <-- %s", nc.name, err.Error()))
}
linkType := handler.LinkType()
err = handler.SetBPFFilter(fmt.Sprintf("tcp and (port %d)", snifferPort))
if err != nil {
panic(err.Error())
}
handler := initEthernetHandler()
for {
var data []byte
data, ci, err := handler.ZeroCopyReadPacketData()
@@ -60,7 +86,7 @@ func (nc *networkCard) Listen() (receiver chan model.QueryPiece) {
continue
}
packet := gopacket.NewPacket(data, linkType, gopacket.NoCopy)
packet := gopacket.NewPacket(data, layers.LayerTypeEthernet, gopacket.NoCopy)
m := packet.Metadata()
m.CaptureInfo = ci
m.Truncated = m.Truncated || ci.CaptureLength < ci.Length