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109aa3b2fb
Updates #6526 Change-Id: I84e440a8bd837c383000ce0cec4ff36b24249e8b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package localapi
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"strconv"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/tailcfg"
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)
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func (h *Handler) serveDebugDERPRegion(w http.ResponseWriter, r *http.Request) {
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if !h.PermitWrite {
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http.Error(w, "debug access denied", http.StatusForbidden)
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return
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}
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if r.Method != "POST" {
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http.Error(w, "POST required", http.StatusMethodNotAllowed)
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return
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}
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var st ipnstate.DebugDERPRegionReport
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defer func() {
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j, _ := json.Marshal(st)
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w.Header().Set("Content-Type", "application/json")
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w.Write(j)
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}()
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dm := h.b.DERPMap()
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if dm == nil {
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st.Errors = append(st.Errors, "no DERP map (not connected?)")
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return
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}
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regStr := r.FormValue("region")
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var reg *tailcfg.DERPRegion
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if id, err := strconv.Atoi(regStr); err == nil {
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reg = dm.Regions[id]
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} else {
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for _, r := range dm.Regions {
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if r.RegionCode == regStr {
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reg = r
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break
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}
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}
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}
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if reg == nil {
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st.Errors = append(st.Errors, fmt.Sprintf("no such region %q in DERP map", regStr))
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return
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}
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st.Info = append(st.Info, fmt.Sprintf("Region %v == %q", reg.RegionID, reg.RegionCode))
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if reg.Avoid {
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st.Warnings = append(st.Warnings, "Region is marked with Avoid bit")
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}
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if len(reg.Nodes) == 0 {
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st.Errors = append(st.Errors, "Region has no nodes defined")
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return
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}
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// TODO(bradfitz): finish:
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// * first try TCP connection
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// * reconnect 4 or 5 times; see if we ever get a different server key.
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// if so, they're load balancing the wrong way. error.
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// * try to DERP auth with new public key.
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// * if rejected, add Info that it's likely the DERP server authz is on,
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// try with LocalBackend's node key instead.
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// * if they have more then one node, try to relay a packet between them
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// and see if it works (like cmd/derpprobe). But if server authz is on,
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// we won't be able to, so just warn. Say to turn that off, try again,
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// then turn it back on. TODO(bradfitz): maybe add a debug frame to DERP
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// protocol to say how many peers it's meshed with. Should match count
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// in DERPRegion. Or maybe even list all their server pub keys that it's peered
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// with.
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// * try STUN queries
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// * warn about IPv6 only
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// * If their certificate is bad, either expired or just wrongly
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// issued in the first place, tell them specifically that the
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// cert is bad not just that the connection failed.
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// * If /generate_204 on port 80 cannot be reached, warn
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// that they won't get captive portal detection and
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// should allow port 80.
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// * If they have exactly one DERP region because they
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// removed all of Tailscale's DERPs, warn that they have
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// a SPOF that will hamper even direct connections from
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// working. (warning, not error, as that's probably a likely
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// config for headscale users)
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st.Info = append(st.Info, "TODO: 🦉")
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}
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