mirror of https://github.com/tailscale/tailscale/
wgengine/magicsock: add HTML debug handler to see magicsock state
Change-Id: Ibc46f4e9651e1c86ec6f5d139f5e9bdc7a488415 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>pull/3606/head
Brad Fitzpatrick
3 years ago
committed by
Brad Fitzpatrick
parent
c7f5bc0f69
commit
ae319b4636
@ -0,0 +1,202 @@
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// Copyright (c) 2021 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 magicsock
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import (
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"fmt"
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"html"
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"io"
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"net/http"
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"sort"
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"strings"
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"time"
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"inet.af/netaddr"
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"tailscale.com/tailcfg"
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"tailscale.com/tstime/mono"
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"tailscale.com/types/key"
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)
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// ServeHTTPDebug serves an HTML representation of the innards of c for debugging.
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//
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// It's accessible either from tailscaled's debug port (at
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// /debug/magicsock) or via peerapi to a peer that's owned by the same
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// user (so they can e.g. inspect their phones).
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func (c *Conn) ServeHTTPDebug(w http.ResponseWriter, r *http.Request) {
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c.mu.Lock()
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defer c.mu.Unlock()
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now := time.Now()
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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fmt.Fprintf(w, "<h1>magicsock</h1>")
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fmt.Fprintf(w, "<h2 id=derp><a href=#derp>#</a> DERP</h2><ul>")
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if c.derpMap != nil {
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type D struct {
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regionID int
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lastWrite time.Time
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createTime time.Time
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}
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ent := make([]D, 0, len(c.activeDerp))
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for rid, ad := range c.activeDerp {
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ent = append(ent, D{
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regionID: rid,
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lastWrite: *ad.lastWrite,
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createTime: ad.createTime,
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})
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}
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sort.Slice(ent, func(i, j int) bool {
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return ent[i].regionID < ent[j].regionID
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})
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for _, e := range ent {
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r, ok := c.derpMap.Regions[e.regionID]
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if !ok {
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continue
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}
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home := ""
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if e.regionID == c.myDerp {
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home = "🏠"
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}
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fmt.Fprintf(w, "<li>%s %d - %v: created %v ago, write %v ago</li>\n",
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home, e.regionID, html.EscapeString(r.RegionCode),
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now.Sub(e.createTime).Round(time.Second),
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now.Sub(e.lastWrite).Round(time.Second),
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)
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}
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}
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fmt.Fprintf(w, "</ul>\n")
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fmt.Fprintf(w, "<h2 id=ipport><a href=#ipport>#</a> ip:port to endpoint</h2><ul>")
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{
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type kv struct {
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ipp netaddr.IPPort
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pi *peerInfo
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}
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ent := make([]kv, 0, len(c.peerMap.byIPPort))
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for k, v := range c.peerMap.byIPPort {
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ent = append(ent, kv{k, v})
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}
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sort.Slice(ent, func(i, j int) bool { return ipPortLess(ent[i].ipp, ent[j].ipp) })
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for _, e := range ent {
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ep := e.pi.ep
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shortStr := ep.publicKey.ShortString()
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fmt.Fprintf(w, "<li>%v: <a href='#%v'>%v</a></li>\n", e.ipp, strings.Trim(shortStr, "[]"), shortStr)
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}
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}
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fmt.Fprintf(w, "</ul>\n")
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fmt.Fprintf(w, "<h2 id=bykey><a href=#bykey>#</a> endpoints by key</h2>")
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{
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type kv struct {
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pub key.NodePublic
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pi *peerInfo
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}
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ent := make([]kv, 0, len(c.peerMap.byNodeKey))
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for k, v := range c.peerMap.byNodeKey {
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ent = append(ent, kv{k, v})
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}
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sort.Slice(ent, func(i, j int) bool { return ent[i].pub.Less(ent[j].pub) })
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peers := map[key.NodePublic]*tailcfg.Node{}
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if c.netMap != nil {
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for _, p := range c.netMap.Peers {
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peers[p.Key] = p
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}
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}
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for _, e := range ent {
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ep := e.pi.ep
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shortStr := e.pub.ShortString()
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name := peerDebugName(peers[e.pub])
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fmt.Fprintf(w, "<h3 id=%v><a href='#%v'>%v</a> - %s</h3>\n",
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strings.Trim(shortStr, "[]"),
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strings.Trim(shortStr, "[]"),
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shortStr,
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html.EscapeString(name))
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printEndpointHTML(w, ep)
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}
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}
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}
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func printEndpointHTML(w io.Writer, ep *endpoint) {
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lastRecv := ep.lastRecv.LoadAtomic()
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ep.mu.Lock()
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defer ep.mu.Unlock()
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if ep.lastSend == 0 && lastRecv == 0 {
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return // no activity ever
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}
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now := time.Now()
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mnow := mono.Now()
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fmtMono := func(m mono.Time) string {
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if m == 0 {
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return "-"
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}
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return mnow.Sub(m).Round(time.Millisecond).String()
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}
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fmt.Fprintf(w, "<p>Best: <b>%+v</b>, %v ago (for %v)</p>\n", ep.bestAddr, fmtMono(ep.bestAddrAt), ep.trustBestAddrUntil.Sub(mnow).Round(time.Millisecond))
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fmt.Fprintf(w, "<p>heartbeating: %v</p>\n", ep.heartBeatTimer != nil)
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fmt.Fprintf(w, "<p>lastSend: %v ago</p>\n", fmtMono(ep.lastSend))
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fmt.Fprintf(w, "<p>lastFullPing: %v ago</p>\n", fmtMono(ep.lastFullPing))
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eps := make([]netaddr.IPPort, 0, len(ep.endpointState))
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for ipp := range ep.endpointState {
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eps = append(eps, ipp)
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}
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sort.Slice(eps, func(i, j int) bool { return ipPortLess(eps[i], eps[j]) })
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io.WriteString(w, "<p>Endpoints:</p><ul>")
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for _, ipp := range eps {
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s := ep.endpointState[ipp]
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if ipp == ep.bestAddr.IPPort {
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fmt.Fprintf(w, "<li><b>%s</b>: (best)<ul>", ipp)
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} else {
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fmt.Fprintf(w, "<li>%s: ...<ul>", ipp)
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}
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fmt.Fprintf(w, "<li>lastPing: %v ago</li>\n", fmtMono(s.lastPing))
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if s.lastGotPing.IsZero() {
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fmt.Fprintf(w, "<li>disco-learned-at: -</li>\n")
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} else {
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fmt.Fprintf(w, "<li>disco-learned-at: %v ago</li>\n", now.Sub(s.lastGotPing).Round(time.Second))
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}
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fmt.Fprintf(w, "<li>callMeMaybeTime: %v</li>\n", s.callMeMaybeTime)
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for i := range s.recentPongs {
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if i == 5 {
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break
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}
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pos := (int(s.recentPong) - i) % len(s.recentPongs)
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pr := s.recentPongs[pos]
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fmt.Fprintf(w, "<li>pong %v ago: in %v, from %v src %v</li>\n",
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fmtMono(pr.pongAt), pr.latency.Round(time.Millisecond/10),
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pr.from, pr.pongSrc)
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}
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fmt.Fprintf(w, "</ul></li>\n")
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}
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io.WriteString(w, "</ul>")
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}
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func peerDebugName(p *tailcfg.Node) string {
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if p == nil {
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return ""
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}
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n := p.Name
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if i := strings.Index(n, "."); i != -1 {
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return n[:i]
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}
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return p.Hostinfo.Hostname
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}
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func ipPortLess(a, b netaddr.IPPort) bool {
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if v := a.IP().Compare(b.IP()); v != 0 {
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return v < 0
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}
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return a.Port() < b.Port()
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}
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