/
unicorno.go
222 lines (184 loc) · 4.95 KB
/
unicorno.go
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package main
import (
"bufio"
"flag"
"fmt"
"net/http"
"os"
"os/signal"
"sync"
"time"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"github.com/google/gopacket/tcpassembly"
"github.com/google/gopacket/tcpassembly/tcpreader"
)
var iface = flag.String("i", "eth0", "Interface to get packets from")
var snaplen = flag.Int("l", 1600, "SnapLen for pcap packet capture")
var srcFilter = flag.String("s", "tcp and src port 80", "BPF filter for pcap")
var dstFilter = flag.String("d", "tcp and dst port 80", "BPF filter for pcap")
type inFlightRequest struct {
req *http.Request
startTime time.Time
}
func (i *inFlightRequest) String() string {
return fmt.Sprintf("[%s] http://%s%s", i.req.Method, i.req.Host, i.req.RequestURI)
}
type PortHash map[uint64]*inFlightRequest
type IpHash map[uint64]PortHash
type requestPool struct {
inFlight IpHash
mtx sync.Mutex
}
func (p *requestPool) RemoveInFlight() {
p.mtx.Lock()
defer p.mtx.Unlock()
removeQueue := []uint64{}
cutOff := time.Now().Add(-1 * time.Minute)
for _, flowMap := range p.inFlight {
for hash, req := range flowMap {
if req.startTime.Before(cutOff) {
removeQueue = append(removeQueue, hash)
}
}
for _, hash := range removeQueue {
delete(flowMap, hash)
}
}
}
func (p *requestPool) PutReq(net gopacket.Flow, transport gopacket.Flow, req *http.Request, when time.Time) {
p.mtx.Lock()
defer p.mtx.Unlock()
r := &inFlightRequest{
req: req,
startTime: when,
}
netHash := net.FastHash()
portHash := transport.FastHash()
_, ok := p.inFlight[netHash]
if !ok {
p.inFlight[netHash] = make(PortHash)
}
p.inFlight[netHash][portHash] = r
}
func (p *requestPool) PutResp(net gopacket.Flow, transport gopacket.Flow, resp *http.Response, when time.Time) {
p.mtx.Lock()
defer p.mtx.Unlock()
netHash := net.FastHash()
portHash := transport.FastHash()
flowMap, ok := p.inFlight[netHash]
if !ok {
return
}
req, ok := flowMap[portHash]
if !ok {
return
}
deltaTime := when.Sub(req.startTime).String()
fmt.Println(req, "->", resp.Status, ":", deltaTime)
delete(flowMap, portHash)
}
type srcStreamFactory struct {
pool *requestPool
}
func (s *srcStreamFactory) New(net gopacket.Flow, transport gopacket.Flow) tcpassembly.Stream {
hstream := &tcpStream{
net: net,
transport: transport,
r: tcpreader.NewReaderStream(),
}
go s.run(hstream)
return &hstream.r
}
type dstStreamFactory struct {
pool *requestPool
}
func (d *dstStreamFactory) New(net gopacket.Flow, transport gopacket.Flow) tcpassembly.Stream {
hstream := &tcpStream{
net: net,
transport: transport,
r: tcpreader.NewReaderStream(),
}
go d.run(hstream)
return &hstream.r
}
type tcpStream struct {
net gopacket.Flow
transport gopacket.Flow
r tcpreader.ReaderStream
}
func (d *dstStreamFactory) run(h *tcpStream) {
startTime := time.Now()
buf := bufio.NewReader(&h.r)
req, err := http.ReadRequest(buf)
if err != nil {
return
}
defer req.Body.Close()
d.pool.PutReq(h.net, h.transport, req, startTime)
tcpreader.DiscardBytesToFirstError(buf)
}
func (s *srcStreamFactory) run(h *tcpStream) {
buf := bufio.NewReader(&h.r)
req := &http.Request{}
resp, err := http.ReadResponse(buf, req)
if err != nil {
return
}
tcpreader.DiscardBytesToFirstError(buf)
s.pool.PutResp(h.net, h.transport, resp, time.Now())
}
func runFilter(factory tcpassembly.StreamFactory, iface string, snaplen int32, filter string, ch chan os.Signal) {
handle, err := pcap.OpenLive(iface, snaplen, true, pcap.BlockForever)
if err != nil {
panic(err)
}
if err := handle.SetBPFFilter(filter); err != nil {
panic(err)
}
streamPool := tcpassembly.NewStreamPool(factory)
assembler := tcpassembly.NewAssembler(streamPool)
packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
packets := packetSource.Packets()
ticker := time.Tick(time.Minute)
for {
select {
case packet := <-packets:
if packet.NetworkLayer() == nil || packet.TransportLayer() == nil || packet.TransportLayer().LayerType() != layers.LayerTypeTCP {
continue
}
tcp := packet.TransportLayer().(*layers.TCP)
assembler.AssembleWithTimestamp(packet.NetworkLayer().NetworkFlow(), tcp, packet.Metadata().Timestamp)
case <-ticker:
assembler.FlushOlderThan(time.Now().Add(-2 * time.Minute))
case <-ch:
return
}
}
}
func main() {
flag.Parse()
ch := make(chan os.Signal, 1)
signal.Notify(ch, os.Interrupt, os.Kill)
reqPool := &requestPool{
inFlight: make(IpHash),
}
srcFactory := &srcStreamFactory{pool: reqPool}
srcCh := make(chan os.Signal)
go runFilter(srcFactory, *iface, int32(*snaplen), *srcFilter, srcCh)
dstFactory := &dstStreamFactory{pool: reqPool}
dstCh := make(chan os.Signal)
go runFilter(dstFactory, *iface, int32(*snaplen), *dstFilter, dstCh)
ticker := time.Tick(time.Second)
for {
select {
case <-ticker:
reqPool.RemoveInFlight()
case sig := <-ch:
srcCh <- sig
dstCh <- sig
return
}
}
}