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net/netcheck: implement netcheck for js/wasm clients

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And the derper change to add a CORS endpoint for latency measurement.

And a little magicsock change to cut down some log spam on js/wasm.

Updates #3157

Change-Id: I5fd9e6f5098c815116ddc8ac90cbcd0602098a48
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-10-27 09:37:32 -07:00
committed by Brad Fitzpatrick
parent eebe7afad7
commit b0b0a80318
3 changed files with 76 additions and 12 deletions
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13
cmd/derper/derper.go
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@@ -176,6 +176,7 @@ func main() {
derpHandler := derphttp.Handler(s)
derpHandler = addWebSocketSupport(s, derpHandler)
mux.Handle("/derp", derpHandler)
mux.HandleFunc("/derp/probe", probeHandler)
go refreshBootstrapDNSLoop()
mux.HandleFunc("/bootstrap-dns", handleBootstrapDNS)
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -271,8 +272,18 @@ func main() {
}
}
func serveSTUN(host string) {
// 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) {
switch r.Method {
case "HEAD", "GET":
w.Header().Set("Access-Control-Allow-Origin", "*")
default:
http.Error(w, "bogus probe method", http.StatusMethodNotAllowed)
}
}
func serveSTUN(host string) {
pc, err := net.ListenPacket("udp", net.JoinHostPort(host, "3478"))
if err != nil {
log.Fatalf("failed to open STUN listener: %v", err)