Created
March 6, 2018 15:58
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package main | |
import ( | |
"bufio" | |
"log" | |
"os" | |
"github.com/google/gopacket" | |
"github.com/google/gopacket/layers" | |
"github.com/google/gopacket/pcapgo" | |
"github.com/google/gopacket/tcpassembly" | |
) | |
func NewAssembler() *tcpassembly.Assembler { | |
streamFactory := &myFactory{} | |
streamPool := tcpassembly.NewStreamPool(streamFactory) | |
return tcpassembly.NewAssembler(streamPool) | |
} | |
type myFactory struct { | |
counter int64 | |
} | |
func (f *myFactory) New(net, transport gopacket.Flow) tcpassembly.Stream { | |
f.counter += 1 | |
s := &myStream{i: f.counter} | |
log.Printf("stream #%d: (created)", s.i) | |
return s | |
} | |
type myStream struct { | |
i int64 | |
} | |
func (s *myStream) Reassembled(reass []tcpassembly.Reassembly) { | |
log.Printf("stream #%d: Reassembled", s.i) | |
} | |
func (s *myStream) ReassemblyComplete() { | |
log.Printf("stream #%d: ReassemblyComplete", s.i) | |
} | |
func main() { | |
file, err := os.Open(os.Args[1]) | |
if err != nil { | |
log.Fatal(err) | |
} | |
pcap, err := pcapgo.NewReader(bufio.NewReader(file)) | |
if err != nil { | |
log.Fatal(err) | |
} | |
packetSource := gopacket.NewPacketSource(pcap, pcap.LinkType()) | |
packets := packetSource.Packets() | |
assembler := NewAssembler() | |
var packetNo int64 | |
packetNo = 1 | |
for packet := range packets { | |
if packet.NetworkLayer() == nil || packet.TransportLayer() == nil || packet.TransportLayer().LayerType() != layers.LayerTypeTCP { | |
continue | |
} | |
tcp := packet.TransportLayer().(*layers.TCP) | |
log.Printf("packet %d: calling AssembleWithTimestamp()", packetNo) | |
packetNo++ | |
assembler.AssembleWithTimestamp(packet.NetworkLayer().NetworkFlow(), tcp, packet.Metadata().Timestamp) | |
} | |
log.Print("calling FlushAll") | |
assembler.FlushAll() | |
} |
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