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cli/netcheck: fail with output if we time out fetching a derpmap (#12528)

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Updates tailscale/corp#20969

Right now, when netcheck starts, it asks tailscaled for a copy of the DERPMap. If it doesn't have one, it makes a HTTPS request to controlplane.tailscale.com to fetch one.

This will always fail if you're on a network with a captive portal actively blocking HTTPS traffic. The code appears to hang entirely because the http.Client doesn't have a Timeout set. It just sits there waiting until the request succeeds or fails.

This adds a timeout of 10 seconds, and logs more details about the status of the HTTPS request.

Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
This commit is contained in:
Andrea Gottardo 2024-06-18 15:04:43 -07:00 committed by GitHub
parent a93173b56a
commit 8eb15d3d2d
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1 changed files with 6 additions and 1 deletions
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7
cmd/tailscale/cli/netcheck.go
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@ -78,9 +78,13 @@ func runNetcheck(ctx context.Context, args []string) error {
log.Printf("No DERP map from tailscaled; using default.")
}
if err != nil || noRegions {
hc := &http.Client{Transport: tlsdial.NewTransport()}
hc := &http.Client{
Transport: tlsdial.NewTransport(),
Timeout: 10 * time.Second,
}
dm, err = prodDERPMap(ctx, hc)
if err != nil {
log.Println("Failed to fetch a DERP map, so netcheck cannot continue. Check your Internet connection.")
return err
}
}
@ -209,6 +213,7 @@ func portMapping(r *netcheck.Report) string {
}
func prodDERPMap(ctx context.Context, httpc *http.Client) (*tailcfg.DERPMap, error) {
log.Printf("attempting to fetch a DERPMap from %s", ipn.DefaultControlURL)
req, err := http.NewRequestWithContext(ctx, "GET", ipn.DefaultControlURL+"/derpmap/default", nil)
if err != nil {
return nil, fmt.Errorf("create prodDERPMap request: %w", err)