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cmd/derper: add --home flag to control home page behavior

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Updates #12897

Change-Id: I7e9c8de0d2daf92cc32e9f6121bc0874c6672540
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2025-03-04 07:41:44 -08:00 committed by Brad Fitzpatrick
parent fa374fa852
commit cae5b97626
1 changed files with 39 additions and 13 deletions
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52
cmd/derper/derper.go
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@ -63,6 +63,7 @@ var (
hostname = flag.String("hostname", "derp.tailscale.com", "LetsEncrypt host name, if addr's port is :443. When --certmode=manual, this can be an IP address to avoid SNI checks")
runSTUN = flag.Bool("stun", true, "whether to run a STUN server. It will bind to the same IP (if any) as the --addr flag value.")
runDERP = flag.Bool("derp", true, "whether to run a DERP server. The only reason to set this false is if you're decommissioning a server but want to keep its bootstrap DNS functionality still running.")
flagHome = flag.String("home", "", "what to serve at the root path. It may be left empty (the default, for a default homepage), \"blank\" for a blank page, or a URL to redirect to")
meshPSKFile = flag.String("mesh-psk-file", defaultMeshPSKFile(), "if non-empty, path to file containing the mesh pre-shared key file. It should contain some hex string; whitespace is trimmed.")
meshWith = flag.String("mesh-with", "", "optional comma-separated list of hostnames to mesh with; the server's own hostname can be in the list. If an entry contains a slash, the second part names a hostname to be used when dialing the target.")
@ -254,6 +255,11 @@ func main() {
}
expvar.Publish("derp", s.ExpVar())
handleHome, ok := getHomeHandler(*flagHome)
if !ok {
log.Fatalf("unknown --home value %q", *flagHome)
}
mux := http.NewServeMux()
if *runDERP {
derpHandler := derphttp.Handler(s)
@ -274,19 +280,7 @@ func main() {
mux.HandleFunc("/bootstrap-dns", tsweb.BrowserHeaderHandlerFunc(handleBootstrapDNS))
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
tsweb.AddBrowserHeaders(w)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(200)
err := homePageTemplate.Execute(w, templateData{
ShowAbuseInfo: validProdHostname.MatchString(*hostname),
Disabled: !*runDERP,
AllowDebug: tsweb.AllowDebugAccess(r),
})
if err != nil {
if r.Context().Err() == nil {
log.Printf("homePageTemplate.Execute: %v", err)
}
return
}
handleHome.ServeHTTP(w, r)
}))
mux.Handle("/robots.txt", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
tsweb.AddBrowserHeaders(w)
@ -579,3 +573,35 @@ var homePageTemplate = template.Must(template.New("home").Parse(`<html><body>
</body>
</html>
`))
// getHomeHandler returns a handler for the home page based on a flag string
// as documented on the --home flag.
func getHomeHandler(val string) (_ http.Handler, ok bool) {
if val == "" {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(200)
err := homePageTemplate.Execute(w, templateData{
ShowAbuseInfo: validProdHostname.MatchString(*hostname),
Disabled: !*runDERP,
AllowDebug: tsweb.AllowDebugAccess(r),
})
if err != nil {
if r.Context().Err() == nil {
log.Printf("homePageTemplate.Execute: %v", err)
}
return
}
}), true
}
if val == "blank" {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(200)
}), true
}
if strings.HasPrefix(val, "http://") || strings.HasPrefix(val, "https://") {
return http.RedirectHandler(val, http.StatusFound), true
}
return nil, false
}