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net/captivedetection: replace 10k log lines with ... less

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We see tons of logs of the form:

    2024/11/15 19:57:29 netcheck: [v2] 76 available captive portal detection endpoints: [Endpoint{URL="http://192.73.240.161/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.240.121/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.240.132/generate_204", StatusCode=204, ExpectedContent="",
11:58SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://209.177.158.246/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://209.177.158.15/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://199.38.182.118/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.243.135/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.243.229/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.243.141/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://45.159.97.144/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://45.159.97.61/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://45.159.97.233/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://45.159.98.196/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://45.159.98.253/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://45.159.98.145/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://68.183.90.120/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://209.177.156.94/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.248.83/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://209.177.156.197/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://199.38.181.104/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://209.177.145.120/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://199.38.181.93/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://199.38.181.103/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://102.67.165.90/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://102.67.165.185/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://102.67.165.36/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.90.147/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.90.207/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.90.104/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://162.248.221.199/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://162.248.221.215/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://162.248.221.248/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://185.34.3.232/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://185.34.3.207/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://185.34.3.75/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://208.83.234.151/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://208.83.233.233/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://208.72.155.133/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://185.40.234.219/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://185.40.234.113/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://185.40.234.77/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://43.245.48.220/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://43.245.48.50/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://43.245.48.250/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.252.65/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.252.134/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://208.111.34.178/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://43.245.49.105/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://43.245.49.83/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://43.245.49.144/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.92.144/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.88.183/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.92.254/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://148.163.220.129/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://148.163.220.134/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://148.163.220.210/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.242.187/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.242.28/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.242.204/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.93.248/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.93.147/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://176.58.93.154/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://192.73.244.245/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://208.111.40.12/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://208.111.40.216/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://103.6.84.152/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://205.147.105.30/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://205.147.105.78/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://102.67.167.245/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://102.67.167.37/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://102.67.167.188/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://103.84.155.178/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://103.84.155.188/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://103.84.155.46/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=true, Provider=DERPMapOther} Endpoint{URL="http://controlplane.tailscale.com/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=false, Provider=Tailscale} Endpoint{URL="http://login.tailscale.com/generate_204", StatusCode=204, ExpectedContent="", SupportsTailscaleChallenge=false, Provider=Tailscale}]

That can be much shorter.

Also add a fast exit path to the concurrency on match. Doing 5 all at
once is still pretty gratuitous, though.

Updates #1634
Fixes #13019

Change-Id: Icdbb16572fca4477b0ee9882683a3ac6eb08e2f2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2024-11-15 14:16:03 -08:00 committed by Brad Fitzpatrick
parent aefbed323f
commit 3b93fd9c44
2 changed files with 42 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
net/captivedetection/captivedetection.go
View File

@ -136,26 +136,31 @@ func interfaceNameDoesNotNeedCaptiveDetection(ifName string, goos string) bool {
func (d *Detector) detectOnInterface(ctx context.Context, ifIndex int, endpoints []Endpoint) bool { func (d *Detector) detectOnInterface(ctx context.Context, ifIndex int, endpoints []Endpoint) bool {
defer d.httpClient.CloseIdleConnections() defer d.httpClient.CloseIdleConnections()
d.logf("[v2] %d available captive portal detection endpoints: %v", len(endpoints), endpoints) use := min(len(endpoints), 5)
endpoints = endpoints[:use]
d.logf("[v2] %d available captive portal detection endpoints; trying %v", len(endpoints), use)
// We try to detect the captive portal more quickly by making requests to multiple endpoints concurrently. // We try to detect the captive portal more quickly by making requests to multiple endpoints concurrently.
var wg sync.WaitGroup var wg sync.WaitGroup
resultCh := make(chan bool, len(endpoints)) resultCh := make(chan bool, len(endpoints))
for i, e := range endpoints { // Once any goroutine detects a captive portal, we shut down the others.
if i >= 5 { ctx, cancel := context.WithCancel(ctx)
// Try a maximum of 5 endpoints, break out (returning false) if we run of attempts. defer cancel()
break
} for _, e := range endpoints {
wg.Add(1) wg.Add(1)
go func(endpoint Endpoint) { go func(endpoint Endpoint) {
defer wg.Done() defer wg.Done()
found, err := d.verifyCaptivePortalEndpoint(ctx, endpoint, ifIndex) found, err := d.verifyCaptivePortalEndpoint(ctx, endpoint, ifIndex)
if err != nil { if err != nil {
if ctx.Err() == nil {
d.logf("[v1] checkCaptivePortalEndpoint failed with endpoint %v: %v", endpoint, err) d.logf("[v1] checkCaptivePortalEndpoint failed with endpoint %v: %v", endpoint, err)
}
return return
} }
if found { if found {
cancel() // one match is good enough
resultCh <- true resultCh <- true
} }
}(e) }(e)

37
net/captivedetection/captivedetection_test.go
View File

@ -7,10 +7,12 @@
"context" "context"
"runtime" "runtime"
"sync" "sync"
"sync/atomic"
"testing" "testing"
"tailscale.com/cmd/testwrapper/flakytest"
"tailscale.com/net/netmon" "tailscale.com/net/netmon"
"tailscale.com/syncs"
"tailscale.com/tstest/nettest"
) )
func TestAvailableEndpointsAlwaysAtLeastTwo(t *testing.T) { func TestAvailableEndpointsAlwaysAtLeastTwo(t *testing.T) {
@ -36,25 +38,46 @@ func TestDetectCaptivePortalReturnsFalse(t *testing.T) {
} }
} }
func TestAllEndpointsAreUpAndReturnExpectedResponse(t *testing.T) { func TestEndpointsAreUpAndReturnExpectedResponse(t *testing.T) {
flakytest.Mark(t, "https://github.com/tailscale/tailscale/issues/13019") nettest.SkipIfNoNetwork(t)
d := NewDetector(t.Logf) d := NewDetector(t.Logf)
endpoints := availableEndpoints(nil, 0, t.Logf, runtime.GOOS) endpoints := availableEndpoints(nil, 0, t.Logf, runtime.GOOS)
t.Logf("testing %d endpoints", len(endpoints))
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
var good atomic.Bool
var wg sync.WaitGroup var wg sync.WaitGroup
sem := syncs.NewSemaphore(5)
for _, e := range endpoints { for _, e := range endpoints {
wg.Add(1) wg.Add(1)
go func(endpoint Endpoint) { go func(endpoint Endpoint) {
defer wg.Done() defer wg.Done()
found, err := d.verifyCaptivePortalEndpoint(context.Background(), endpoint, 0)
if err != nil { if !sem.AcquireContext(ctx) {
t.Errorf("verifyCaptivePortalEndpoint failed with endpoint %v: %v", endpoint, err) return
}
defer sem.Release()
found, err := d.verifyCaptivePortalEndpoint(ctx, endpoint, 0)
if err != nil && ctx.Err() == nil {
t.Logf("verifyCaptivePortalEndpoint failed with endpoint %v: %v", endpoint, err)
} }
if found { if found {
t.Errorf("verifyCaptivePortalEndpoint with endpoint %v says we're behind a captive portal, but we aren't", endpoint) t.Logf("verifyCaptivePortalEndpoint with endpoint %v says we're behind a captive portal, but we aren't", endpoint)
return
} }
good.Store(true)
t.Logf("endpoint good: %v", endpoint)
cancel()
}(e) }(e)
} }
wg.Wait() wg.Wait()
if !good.Load() {
t.Errorf("no good endpoints found")
}
} }