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cmd/tailscale: make netcheck use active DERP map, delete static copy

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After allowing for custom DERP maps, it's convenient to be able to see their latency in
netcheck. This adds a query to the local tailscaled for the current DERPMap.

Updates #1264

Signed-off-by: julianknodt <julianknodt@gmail.com>
This commit is contained in:
julianknodt 2021-06-25 11:44:40 -07:00 committed by Julian Knodt
parent 15677d8a0e
commit 506c2fe8e2
10 changed files with 112 additions and 108 deletions
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15
client/tailscale/tailscale.go
View File

@ -24,6 +24,7 @@
"tailscale.com/ipn/ipnstate"
"tailscale.com/paths"
"tailscale.com/safesocket"
"tailscale.com/tailcfg"
)
// TailscaledSocket is the tailscaled Unix socket.
@ -278,3 +279,17 @@ func SetDNS(ctx context.Context, name, value string) error {
_, err := send(ctx, "POST", "/localapi/v0/set-dns?"+v.Encode(), 200, nil)
return err
}
// CurrentDERPMap returns the current DERPMap that is being used by the local tailscaled.
// It is intended to be used with netcheck to see availability of DERPs.
func CurrentDERPMap(ctx context.Context) (*tailcfg.DERPMap, error) {
var derpMap tailcfg.DERPMap
res, err := send(ctx, "GET", "/localapi/v0/derpmap", 200, nil)
if err != nil {
return nil, err
}
if err = json.Unmarshal(res, &derpMap); err != nil {
return nil, fmt.Errorf("invalid derp map json: %w", err)
}
return &derpMap, nil
}

38
cmd/tailscale/cli/netcheck.go
View File

@ -9,14 +9,18 @@
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"sort"
"strings"
"time"
"github.com/peterbourgon/ff/v2/ffcli"
"tailscale.com/derp/derpmap"
"tailscale.com/client/tailscale"
"tailscale.com/ipn"
"tailscale.com/net/netcheck"
"tailscale.com/net/portmapper"
"tailscale.com/tailcfg"
@ -59,7 +63,13 @@ func runNetcheck(ctx context.Context, args []string) error {
fmt.Fprintln(os.Stderr, "# Warning: this JSON format is not yet considered a stable interface")
}
dm := derpmap.Prod()
dm, err := tailscale.CurrentDERPMap(ctx)
if err != nil {
dm, err = prodDERPMap(ctx, http.DefaultClient)
if err != nil {
return err
}
}
for {
t0 := time.Now()
report, err := c.GetReport(ctx, dm)
@ -176,3 +186,27 @@ func portMapping(r *netcheck.Report) string {
}
return strings.Join(got, ", ")
}
func prodDERPMap(ctx context.Context, httpc *http.Client) (*tailcfg.DERPMap, error) {
req, err := http.NewRequestWithContext(ctx, "GET", ipn.DefaultControlURL+"/derpmap/default", nil)
if err != nil {
return nil, fmt.Errorf("create prodDERPMap request: %w", err)
}
res, err := httpc.Do(req)
if err != nil {
return nil, fmt.Errorf("fetch prodDERPMap failed: %w", err)
}
defer res.Body.Close()
b, err := ioutil.ReadAll(io.LimitReader(res.Body, 1<<20))
if err != nil {
return nil, fmt.Errorf("fetch prodDERPMap failed: %w", err)
}
if res.StatusCode != 200 {
return nil, fmt.Errorf("fetch prodDERPMap: %v: %s", res.Status, b)
}
var derpMap tailcfg.DERPMap
if err = json.Unmarshal(b, &derpMap); err != nil {
return nil, fmt.Errorf("fetch prodDERPMap: %w", err)
}
return &derpMap, nil
}

1
cmd/tailscale/depaware.txt
View File

@ -20,7 +20,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/cmd/tailscale/cli from tailscale.com/cmd/tailscale
tailscale.com/derp from tailscale.com/derp/derphttp
tailscale.com/derp/derphttp from tailscale.com/net/netcheck
tailscale.com/derp/derpmap from tailscale.com/cmd/tailscale/cli
tailscale.com/disco from tailscale.com/derp
tailscale.com/hostinfo from tailscale.com/net/interfaces
tailscale.com/ipn from tailscale.com/cmd/tailscale/cli+

25
cmd/tailscaled/debug.go
View File

@ -11,6 +11,8 @@
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"net/http/httptrace"
@ -19,7 +21,7 @@
"time"
"tailscale.com/derp/derphttp"
"tailscale.com/derp/derpmap"
"tailscale.com/ipn"
"tailscale.com/net/interfaces"
"tailscale.com/net/tshttpproxy"
"tailscale.com/tailcfg"
@ -131,7 +133,26 @@ func getURL(ctx context.Context, urlStr string) error {
}
func checkDerp(ctx context.Context, derpRegion string) error {
dmap := derpmap.Prod()
req, err := http.NewRequestWithContext(ctx, "GET", ipn.DefaultControlURL+"/derpmap/default", nil)
if err != nil {
return fmt.Errorf("create derp map request: %w", err)
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return fmt.Errorf("fetch derp map failed: %w", err)
}
defer res.Body.Close()
b, err := ioutil.ReadAll(io.LimitReader(res.Body, 1<<20))
if err != nil {
return fmt.Errorf("fetch derp map failed: %w", err)
}
if res.StatusCode != 200 {
return fmt.Errorf("fetch derp map: %v: %s", res.Status, b)
}
var dmap tailcfg.DERPMap
if err = json.Unmarshal(b, &dmap); err != nil {
return fmt.Errorf("fetch DERP map: %w", err)
}
getRegion := func() *tailcfg.DERPRegion {
for _, r := range dmap.Regions {
if r.RegionCode == derpRegion {

1
cmd/tailscaled/depaware.txt
View File

@ -81,7 +81,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/control/controlclient from tailscale.com/ipn/ipnlocal+
tailscale.com/derp from tailscale.com/derp/derphttp+
tailscale.com/derp/derphttp from tailscale.com/net/netcheck+
tailscale.com/derp/derpmap from tailscale.com/cmd/tailscaled
tailscale.com/disco from tailscale.com/derp+
tailscale.com/health from tailscale.com/control/controlclient+
tailscale.com/hostinfo from tailscale.com/control/controlclient+

91
derp/derpmap/derpmap.go
View File

@ -1,91 +0,0 @@
// Copyright (c) 2020 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 derpmap contains information about Tailscale.com's production DERP nodes.
//
// This package is only used by the "tailscale netcheck" command for debugging.
// In normal operation the Tailscale nodes get this sent to them from the control
// server.
//
// TODO: remove this package and make "tailscale netcheck" get the
// list from the control server too.
package derpmap
import (
"fmt"
"strings"
"tailscale.com/tailcfg"
)
func derpNode(suffix, v4, v6 string) *tailcfg.DERPNode {
return &tailcfg.DERPNode{
Name: suffix, // updated later
RegionID: 0, // updated later
IPv4: v4,
IPv6: v6,
}
}
func derpRegion(id int, code, name string, nodes ...*tailcfg.DERPNode) *tailcfg.DERPRegion {
region := &tailcfg.DERPRegion{
RegionID: id,
RegionName: name,
RegionCode: code,
Nodes: nodes,
}
for _, n := range nodes {
n.Name = fmt.Sprintf("%d%s", id, n.Name)
n.RegionID = id
n.HostName = fmt.Sprintf("derp%s.tailscale.com", strings.TrimSuffix(n.Name, "a"))
}
return region
}
// Prod returns Tailscale's map of relay servers.
//
// This list is only used by cmd/tailscale's netcheck subcommand. In
// normal operation the Tailscale nodes get this sent to them from the
// control server.
//
// This list is subject to change and should not be relied on.
func Prod() *tailcfg.DERPMap {
return &tailcfg.DERPMap{
Regions: map[int]*tailcfg.DERPRegion{
1: derpRegion(1, "nyc", "New York City",
derpNode("a", "159.89.225.99", "2604:a880:400:d1::828:b001"),
),
2: derpRegion(2, "sfo", "San Francisco",
derpNode("a", "167.172.206.31", "2604:a880:2:d1::c5:7001"),
),
3: derpRegion(3, "sin", "Singapore",
derpNode("a", "68.183.179.66", "2400:6180:0:d1::67d:8001"),
),
4: derpRegion(4, "fra", "Frankfurt",
derpNode("a", "167.172.182.26", "2a03:b0c0:3:e0::36e:9001"),
),
5: derpRegion(5, "syd", "Sydney",
derpNode("a", "103.43.75.49", "2001:19f0:5801:10b7:5400:2ff:feaa:284c"),
),
6: derpRegion(6, "blr", "Bangalore",
derpNode("a", "68.183.90.120", "2400:6180:100:d0::982:d001"),
),
7: derpRegion(7, "tok", "Tokyo",
derpNode("a", "167.179.89.145", "2401:c080:1000:467f:5400:2ff:feee:22aa"),
),
8: derpRegion(8, "lhr", "London",
derpNode("a", "167.71.139.179", "2a03:b0c0:1:e0::3cc:e001"),
),
9: derpRegion(9, "dfw", "Dallas",
derpNode("a", "207.148.3.137", "2001:19f0:6401:1d9c:5400:2ff:feef:bb82"),
),
10: derpRegion(10, "sea", "Seattle",
derpNode("a", "137.220.36.168", "2001:19f0:8001:2d9:5400:2ff:feef:bbb1"),
),
11: derpRegion(11, "sao", "São Paulo",
derpNode("a", "18.230.97.74", "2600:1f1e:ee4:5611:ec5c:1736:d43b:a454"),
),
},
}
}

10
ipn/ipnlocal/local.go
View File

@ -2752,3 +2752,13 @@ func (b *LocalBackend) PeerDialControlFunc() func(network, address string, c sys
}
return nil
}
// DERPMap returns the current DERPMap in use, or nil if not connected.
func (b *LocalBackend) DERPMap() *tailcfg.DERPMap {
b.mu.Lock()
defer b.mu.Unlock()
if b.netMap == nil {
return nil
}
return b.netMap.DERPMap
}

13
ipn/localapi/localapi.go
View File

@ -102,6 +102,8 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.serveFileTargets(w, r)
case "/localapi/v0/set-dns":
h.serveSetDNS(w, r)
case "/localapi/v0/derpmap":
h.serveDERPMap(w, r)
case "/":
io.WriteString(w, "tailscaled\n")
default:
@ -403,6 +405,17 @@ func (h *Handler) serveSetDNS(w http.ResponseWriter, r *http.Request) {
json.NewEncoder(w).Encode(struct{}{})
}
func (h *Handler) serveDERPMap(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "want GET", 400)
return
}
w.Header().Set("Content-Type", "application/json")
e := json.NewEncoder(w)
e.SetIndent("", "\t")
e.Encode(h.b.DERPMap())
}
var dialPeerTransportOnce struct {
sync.Once
v *http.Transport

9
tstest/integration/testcontrol/testcontrol.go
View File

@ -28,7 +28,6 @@
"github.com/klauspost/compress/zstd"
"golang.org/x/crypto/nacl/box"
"inet.af/netaddr"
"tailscale.com/derp/derpmap"
"tailscale.com/smallzstd"
"tailscale.com/tailcfg"
"tailscale.com/types/logger"
@ -616,8 +615,6 @@ func (s *Server) serveMap(w http.ResponseWriter, r *http.Request, mkey tailcfg.M
KeepAlive: true,
}
var prodDERPMap = derpmap.Prod()
// MapResponse generates a MapResponse for a MapRequest.
//
// No updates to s are done here.
@ -627,14 +624,10 @@ func (s *Server) MapResponse(req *tailcfg.MapRequest) (res *tailcfg.MapResponse,
// node key rotated away (once test server supports that)
return nil, nil
}
derpMap := s.DERPMap
if derpMap == nil {
derpMap = prodDERPMap
}
user, _ := s.getUser(req.NodeKey)
res = &tailcfg.MapResponse{
Node: node,
DERPMap: derpMap,
DERPMap: s.DERPMap,
Domain: string(user.Domain),
CollectServices: "true",
PacketFilter: tailcfg.FilterAllowAll,

17
wgengine/magicsock/magicsock_test.go
View File

@ -32,7 +32,6 @@
"inet.af/netaddr"
"tailscale.com/derp"
"tailscale.com/derp/derphttp"
"tailscale.com/derp/derpmap"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/stun/stuntest"
"tailscale.com/net/tstun"
@ -396,7 +395,19 @@ func TestPickDERPFallback(t *testing.T) {
tstest.ResourceCheck(t)
c := newConn()
c.derpMap = derpmap.Prod()
dm := &tailcfg.DERPMap{
Regions: map[int]*tailcfg.DERPRegion{
1: &tailcfg.DERPRegion{},
2: &tailcfg.DERPRegion{},
3: &tailcfg.DERPRegion{},
4: &tailcfg.DERPRegion{},
5: &tailcfg.DERPRegion{},
6: &tailcfg.DERPRegion{},
7: &tailcfg.DERPRegion{},
8: &tailcfg.DERPRegion{},
},
}
c.derpMap = dm
a := c.pickDERPFallback()
if a == 0 {
t.Fatalf("pickDERPFallback returned 0")
@ -415,7 +426,7 @@ func TestPickDERPFallback(t *testing.T) {
got := map[int]int{}
for i := 0; i < 50; i++ {
c = newConn()
c.derpMap = derpmap.Prod()
c.derpMap = dm
got[c.pickDERPFallback()]++
}
t.Logf("distribution: %v", got)