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package hook
import (
"bytes"
"encoding/hex"
"fmt"
"os"
"path"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
const teeDefaultFile = "/tmp/tunnel/dump"
type tee struct {
f *os.File
}
type teeHook struct {
file 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 {
for b := range rq {
t.dump(">", b)
wq <- b
}
return nil
}
func (t *tee) Recv(rq, wq queue.Q) error {
for b := range rq {
t.dump("<", b)
wq <- b
}
return nil
}
func (t *tee) Close() {
t.f.Close()
}
func (h *teeHook) where(env env.Env) string {
if h.file != "" {
return h.file
}
if v := env.GetLocal("tee.file"); v != "" {
return v
}
return teeDefaultFile
}
func (h *teeHook) Open(env env.Env) (interface{}, error) {
file := h.where(env)
dir := path.Dir(file)
if err := os.MkdirAll(dir, 0755); err != nil {
return nil, err
}
tid, sid := env.Get("tunnel"), env.Get("stream")
name := fmt.Sprintf("%s.%s.%s", file, tid, sid)
var t tee
if f, err := os.Create(name); err != nil {
return nil, err
} else {
t.f = f
}
return &t, nil
}
func newTeeHook(opts opts.Opts, env env.Env) (hook, error) {
h := &teeHook{}
if file, ok := opts["file"]; ok {
h.file = file
}
return h, nil
}
func init() {
register("tee", newTeeHook)
}
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