debug-sni.go

debug-sni.go

package main

import (
	"flag"
	"fmt"
	"html"
	"log"
	"net/http"
)

var (
	addr     = flag.String("addr", ":8080", "accept connections on a network address")
	certFile = flag.String("cert", "", "certificate file")
	keyFile  = flag.String("key", "", "private key file")
)

func main() {
	flag.Parse()

	if *certFile == "" {
		log.Fatal("no -cert option")
	}
	if *keyFile == "" {
		log.Fatal("no -key option")
	}

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		log.Printf("%s - %q - %s %s %s", r.RemoteAddr, r.TLS.ServerName, r.Method, r.RequestURI, r.Proto)
		fmt.Fprintf(w, "TLS Server Name: %s\n", html.EscapeString(r.TLS.ServerName))
	})

	log.Printf("listen on %s", *addr)
	log.Fatal(http.ListenAndServeTLS(*addr, *certFile, *keyFile, nil))
}