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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
// The stund binary is a standalone STUN server.
package main
import (
"context"
"flag"
"io"
"log"
"net/http"
"os/signal"
"syscall"
"tailscale.com/net/stunserver"
"tailscale.com/tsweb"
// Support for prometheus varz in tsweb
_ "tailscale.com/tsweb/promvarz"
)
var (
stunAddr = flag.String("stun", ":3478", "UDP address on which to start the STUN server")
httpAddr = flag.String("http", ":3479", "address on which to start the debug http server")
)
func main() {
flag.Parse()
ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer cancel()
log.Printf("HTTP server listening on %s", *httpAddr)
go http.ListenAndServe(*httpAddr, mux())
s := stunserver.New(ctx)
if err := s.ListenAndServe(*stunAddr); err != nil {
log.Fatal(err)
}
}
func mux() *http.ServeMux {
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "<h1>stund</h1><a href=/debug>/debug</a>")
})
debug := tsweb.Debugger(mux)
debug.KV("stun_addr", *stunAddr)
return mux
}
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