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cmd/derper: add flag to run derper in bootstrap-dns-only mode

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Change-Id: Iba128e94464afa605bc9df1f06a91d296380eed0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-09-03 19:41:31 -07:00 committed by Brad Fitzpatrick
parent 3344c3b89b
commit 02de34fb10
1 changed files with 13 additions and 3 deletions
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16
cmd/derper/derper.go
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@ -46,6 +46,7 @@ var (
certDir = flag.String("certdir", tsweb.DefaultCertDir("derper-certs"), "directory to store LetsEncrypt certs, if addr's port is :443")
hostname = flag.String("hostname", "derp.tailscale.com", "LetsEncrypt host name, if addr's port is :443")
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.")
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")
@ -170,9 +171,15 @@ func main() {
expvar.Publish("derp", s.ExpVar())
mux := http.NewServeMux()
derpHandler := derphttp.Handler(s)
derpHandler = addWebSocketSupport(s, derpHandler)
mux.Handle("/derp", derpHandler)
if *runDERP {
derpHandler := derphttp.Handler(s)
derpHandler = addWebSocketSupport(s, derpHandler)
mux.Handle("/derp", derpHandler)
} else {
mux.Handle("/derp", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Error(w, "derp server disabled", http.StatusNotFound)
}))
}
mux.HandleFunc("/derp/probe", probeHandler)
go refreshBootstrapDNSLoop()
mux.HandleFunc("/bootstrap-dns", handleBootstrapDNS)
@ -188,6 +195,9 @@ func main() {
server.
</p>
`)
if !*runDERP {
io.WriteString(w, `<p>Status: <b>disabled</b></p>`)
}
if tsweb.AllowDebugAccess(r) {
io.WriteString(w, "<p>Debug info at <a href='/debug/'>/debug/</a>.</p>\n")
}