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cmd/derper: add /bootstrap-dns handler

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For option (d) of #1405.

For an HTTPS request of /bootstrap-dns, this returns e.g.:

{
  "log.tailscale.io": [
    "2600:1f14:436:d603:342:4c0d:2df9:191b",
    "34.210.105.16"
  ],
  "login.tailscale.com": [
    "2a05:d014:386:203:f8b4:1d5a:f163:e187",
    "3.121.18.47"
  ]
}

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-02-26 08:28:31 -08:00
committed by Brad Fitzpatrick
parent c1ae1a3d2d
commit f68431fc02
2 changed files with 72 additions and 0 deletions
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3
cmd/derper/derper.go
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@@ -48,6 +48,7 @@ var (
runSTUN = flag.Bool("stun", false, "also run a STUN server")
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")
bootstrapDNS = flag.String("bootstrap-dns-names", "", "optional comma-separated list of hostnames to make available at /bootstrap-dns")
)
type config struct {
@@ -145,6 +146,8 @@ func main() {
// Create our own mux so we don't expose /debug/ stuff to the world.
mux := tsweb.NewMux(debugHandler(s))
mux.Handle("/derp", derphttp.Handler(s))
go refreshBootstrapDNSLoop()
mux.HandleFunc("/bootstrap-dns", handleBootstrapDNS)
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(200)