1 files changed, 112 insertions, 0 deletions
diff --git a/pkg/server/module/tee.go b/pkg/server/module/tee.go
new file mode 100644
index 0000000..7953247
--- /dev/null
+++ b/pkg/server/module/tee.go
@@ -0,0 +1,112 @@
+package module
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"encoding/hex"
+	"sync"
+	"tunnel/pkg/server/env"
+	"tunnel/pkg/server/opts"
+	"tunnel/pkg/server/queue"
+)
+
+const teeDefaultPath = "/tmp/tunnel.dump"
+
+type tee struct {
+	f *os.File
+	mu sync.Mutex
+	wg sync.WaitGroup
+}
+
+type teeModule struct {
+	path string
+}
+
+func (t *tee) dump(s string, p []byte) error {
+	var out bytes.Buffer
+
+	fmt.Fprintln(&out, s, len(p))
+
+	w := hex.Dumper(&out)
+	w.Write(p)
+	w.Close()
+
+	if _, err := t.f.Write(out.Bytes()); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (t *tee) Send(rq, wq queue.Q) error {
+	defer t.wg.Done()
+
+	for b := range rq {
+		t.dump(">", b)
+		wq <- b
+	}
+
+	return nil
+}
+
+func (t *tee) Recv(rq, wq queue.Q) error {
+	defer t.wg.Done()
+
+	for b := range rq {
+		t.dump("<", b)
+		wq <- b
+	}
+
+	return nil
+}
+
+func (m *teeModule) where(env env.Env) string {
+	if m.path != "" {
+		return m.path
+	}
+
+	if v := env.Eval("@{tunnel.@{tunnel}.tee.path}"); v != "" {
+		return v
+	}
+
+	if v, ok := env.Find("module.tee.path"); ok {
+		return v
+	}
+
+	return teeDefaultPath
+}
+
+func (m *teeModule) Open(env env.Env) (interface{}, error) {
+	tid, sid := env.Get("tunnel"), env.Get("stream")
+	name := fmt.Sprintf("%s.%s.%s", m.where(env), tid, sid)
+
+	var t tee
+
+	if f, err := os.Create(name); err != nil {
+		return nil, err
+	} else {
+		t.f = f
+	}
+
+	t.wg.Add(2)
+
+	go func() {
+		t.wg.Wait()
+		t.f.Close()
+	}()
+
+	return &t, nil
+}
+
+func newTeeModule(opts opts.Opts, env env.Env) (module, error) {
+	m := &teeModule{}
+	if path, ok := opts["path"]; ok {
+		m.path = path
+	}
+	return m, nil
+}
+
+func init() {
+	register("tee", newTeeModule)
+}