// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package tsnet_test
import (
"flag"
"fmt"
"html"
"log"
"net/http"
"strings"
"tailscale.com/tsnet"
)
func firstLabel(s string) string {
s, _, _ = strings.Cut(s, ".")
return s
}
// Example_tshello is a full example on using tsnet. When you run this program it will print
// an authentication link. Open it in your favorite web browser and add it to your tailnet
// like any other machine. Open another terminal window and try to ping it:
//
// $ ping tshello -c 2
// PING tshello (100.105.183.159) 56(84) bytes of data.
// 64 bytes from tshello.your-tailnet.ts.net (100.105.183.159): icmp_seq=1 ttl=64 time=25.0 ms
// 64 bytes from tshello.your-tailnet.ts.net (100.105.183.159): icmp_seq=2 ttl=64 time=1.12 ms
//
// Then connect to it using curl:
//
// $ curl http://tshello
// <html><body><h1>Hello, world!</h1>
// <p>You are <b>Xe</b> from <b>pneuma</b> (100.78.40.86:49214)</p>
//
// From here you can do anything you want with the Go standard library HTTP stack, or anything
// that is compatible with it (Gin/Gonic, Gorilla/mux, etc.).
func Example_tshello() {
var (
addr = flag.String("addr", ":80", "address to listen on")
hostname = flag.String("hostname", "tshello", "hostname to use on the tailnet")
)
flag.Parse()
s := new(tsnet.Server)
s.Hostname = *hostname
defer s.Close()
ln, err := s.Listen("tcp", *addr)
if err != nil {
log.Fatal(err)
}
defer ln.Close()
lc, err := s.LocalClient()
if err != nil {
log.Fatal(err)
}
log.Fatal(http.Serve(ln, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
who, err := lc.WhoIs(r.Context(), r.RemoteAddr)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
fmt.Fprintf(w, "<html><body><h1>Hello, tailnet!</h1>\n")
fmt.Fprintf(w, "<p>You are <b>%s</b> from <b>%s</b> (%s)</p>",
html.EscapeString(who.UserProfile.LoginName),
html.EscapeString(firstLabel(who.Node.ComputedName)),
r.RemoteAddr)
})))
}