tailscale/wgengine/magicsock/debughttp.go

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