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cmd/derper: add /generate_204 endpoint (#5601)

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For captive portal detection.

Signed-off-by: Andrew Dunham <andrew@tailscale.com>
This commit is contained in:
Andrew Dunham 2022-09-12 13:43:50 -04:00 committed by GitHub
parent 16939f0d56
commit eb5939289c
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 1 deletions
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11
cmd/derper/derper.go
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@ -206,6 +206,7 @@ func main() {
mux.Handle("/robots.txt", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "User-agent: *\nDisallow: /\n")
}))
mux.Handle("/generate_204", http.HandlerFunc(serveNoContent))
debug := tsweb.Debugger(mux)
debug.KV("TLS hostname", *hostname)
debug.KV("Mesh key", s.HasMeshKey())
@ -293,9 +294,12 @@ func main() {
})
if *httpPort > -1 {
go func() {
port80mux := http.NewServeMux()
port80mux.HandleFunc("/generate_204", serveNoContent)
port80mux.Handle("/", certManager.HTTPHandler(tsweb.Port80Handler{Main: mux}))
port80srv := &http.Server{
Addr: net.JoinHostPort(listenHost, fmt.Sprintf("%d", *httpPort)),
Handler: certManager.HTTPHandler(tsweb.Port80Handler{Main: mux}),
Handler: port80mux,
ErrorLog: quietLogger,
ReadTimeout: 30 * time.Second,
// Crank up WriteTimeout a bit more than usually
@ -322,6 +326,11 @@ func main() {
}
}
// For captive portal detection
func serveNoContent(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNoContent)
}
// probeHandler is the endpoint that js/wasm clients hit to measure
// DERP latency, since they can't do UDP STUN queries.
func probeHandler(w http.ResponseWriter, r *http.Request) {