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net/netcheck: add check for captive portal (#5593)

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This doesn't change any behaviour for now, other than maybe running a
full netcheck more often. The intent is to start gathering data on
captive portals, and additionally, seeing this in the 'tailscale
netcheck' command should provide a bit of additional information to
users.

Updates #1634

Change-Id: I6ba08f9c584dc0200619fa97f9fde1a319f25c76
Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
This commit is contained in:
Andrew Dunham
2022-09-20 15:31:49 -04:00
committed by GitHub
parent aa5e494aba
commit c6162c2a94
5 changed files with 212 additions and 0 deletions
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3
cmd/tailscale/cli/netcheck.go
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@@ -133,6 +133,9 @@ func printReport(dm *tailcfg.DERPMap, report *netcheck.Report) error {
printf("\t* MappingVariesByDestIP: %v\n", report.MappingVariesByDestIP)
printf("\t* HairPinning: %v\n", report.HairPinning)
printf("\t* PortMapping: %v\n", portMapping(report))
if report.CaptivePortal != "" {
printf("\t* CaptivePortal: %v\n", report.CaptivePortal)
}
// When DERP latency checking failed,
// magicsock will try to pick the DERP server that