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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
// The tsnet-services example demonstrates how to use tsnet with Services.
//
// To run this example yourself:
//
// 1. Add access controls which (i) define a new ACL tag, (ii) allow the demo
// node to host the Service, and (iii) allow peers on the tailnet to reach
// the Service. A sample ACL policy is provided below.
//
// 2. [Generate an auth key] using the Tailscale admin panel. When doing so, add
// your new tag to your key (Service hosts must be tagged nodes).
//
// 3. [Define a Service]. For the purposes of this demo, it must be defined to
// listen on TCP port 443. Note that you only need to follow Step 1 in the
// linked document.
//
// 4. Run the demo on the command line:
//
// TS_AUTHKEY=<yourkey> go run tsnet-services.go -service <service-name>
//
// The following is a sample ACL policy for step 1:
//
// "tagOwners": {
// "tag:tsnet-demo-host": ["autogroup:member"],
// },
// "autoApprovers": {
// "services": {
// "svc:tsnet-demo": ["tag:tsnet-demo-host"],
// },
// },
// "grants": [
// "src": ["*"],
// "dst": ["svc:tsnet-demo"],
// "ip": ["*"],
// ],
//
// [Define a Service]: https://tailscale.com/kb/1552/tailscale-services#step-1-define-a-tailscale-service
// [Generate an auth key]: https://tailscale.com/kb/1085/auth-keys#generate-an-auth-key
package main
import (
"flag"
"fmt"
"log"
"net/http"
"tailscale.com/tsnet"
)
var (
svcName = flag.String("service", "", "the name of your Service, e.g. svc:tsnet-demo")
)
func main() {
flag.Parse()
if *svcName == "" {
log.Fatal("a Service name must be provided")
}
s := &tsnet.Server{
Hostname: "tsnet-services-demo",
}
defer s.Close()
ln, err := s.ListenService(*svcName, tsnet.ServiceModeHTTP{
HTTPS: true,
Port: 443,
})
if err != nil {
log.Fatal(err)
}
defer ln.Close()
log.Printf("Listening on https://%v\n", ln.FQDN)
err = http.Serve(ln, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "<html><body><h1>Hello, tailnet!</h1>")
}))
log.Fatal(err)
}
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