-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
37 lines (34 loc) · 1.13 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
package main
import (
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"github.com/google/gopacket/pcapgo"
"os"
)
func main() {
f, err := os.Create("en0.pcap")
if err != nil {
panic(err)
}
defer f.Close()
pcapw := pcapgo.NewWriter(f)
if err := pcapw.WriteFileHeader(1600, layers.LinkTypeEthernet); err != nil {
panic(err)
}
if handle, err := pcap.OpenLive("en0", 1600, true, pcap.BlockForever); err != nil {
panic(err)
} else if err := handle.SetBPFFilter("udp and port 37008"); err != nil {
panic(err)
} else {
packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
for packet := range packetSource.Packets() {
incapsulatedPacket := gopacket.NewPacket(packet.ApplicationLayer().Payload()[5:], layers.LayerTypeEthernet, gopacket.Default)
incapsulatedPacket.Metadata().CaptureInfo.Length = len(incapsulatedPacket.Data())
incapsulatedPacket.Metadata().CaptureInfo.CaptureLength = len(incapsulatedPacket.Data())
if err := pcapw.WritePacket(incapsulatedPacket.Metadata().CaptureInfo, incapsulatedPacket.Data()); err != nil {
panic(err)
}
}
}
}