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cmd/tailscale: add debug flag to dump derp map

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This adds a flag in tailscale debug for dumping the derp map to stdout.

Fixes #2249.

Signed-off-by: julianknodt <julianknodt@gmail.com>
This commit is contained in:
julianknodt 2021-06-28 17:51:10 -07:00 committed by Julian Knodt
parent fd7fddd44f
commit e68d4d5805
1 changed files with 14 additions and 0 deletions
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14
cmd/tailscale/cli/debug.go
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@ -31,6 +31,7 @@ var debugCmd = &ffcli.Command{
fs.BoolVar(&debugArgs.goroutines, "daemon-goroutines", false, "If true, dump the tailscaled daemon's goroutines") fs.BoolVar(&debugArgs.goroutines, "daemon-goroutines", false, "If true, dump the tailscaled daemon's goroutines")
fs.BoolVar(&debugArgs.ipn, "ipn", false, "If true, subscribe to IPN notifications") fs.BoolVar(&debugArgs.ipn, "ipn", false, "If true, subscribe to IPN notifications")
fs.BoolVar(&debugArgs.prefs, "prefs", false, "If true, dump active prefs") fs.BoolVar(&debugArgs.prefs, "prefs", false, "If true, dump active prefs")
fs.BoolVar(&debugArgs.derpMap, "derp", false, "If true, dump DERP map")
fs.BoolVar(&debugArgs.pretty, "pretty", false, "If true, pretty-print output (for --prefs)") fs.BoolVar(&debugArgs.pretty, "pretty", false, "If true, pretty-print output (for --prefs)")
fs.BoolVar(&debugArgs.netMap, "netmap", true, "whether to include netmap in --ipn mode") fs.BoolVar(&debugArgs.netMap, "netmap", true, "whether to include netmap in --ipn mode")
fs.BoolVar(&debugArgs.localCreds, "local-creds", false, "print how to connect to local tailscaled") fs.BoolVar(&debugArgs.localCreds, "local-creds", false, "print how to connect to local tailscaled")
@ -44,6 +45,7 @@ var debugArgs struct {
goroutines bool goroutines bool
ipn bool ipn bool
netMap bool netMap bool
derpMap bool
file string file string
prefs bool prefs bool
pretty bool pretty bool
@ -87,6 +89,18 @@ func runDebug(ctx context.Context, args []string) error {
os.Stdout.Write(goroutines) os.Stdout.Write(goroutines)
return nil return nil
} }
if debugArgs.derpMap {
dm, err := tailscale.CurrentDERPMap(ctx)
if err != nil {
return fmt.Errorf(
"failed to get local derp map, instead `curl %s/derpmap/default`: %w", ipn.DefaultControlURL, err,
)
}
enc := json.NewEncoder(os.Stdout)
enc.SetIndent("", "\t")
enc.Encode(dm)
return nil
}
if debugArgs.ipn { if debugArgs.ipn {
c, bc, ctx, cancel := connect(ctx) c, bc, ctx, cancel := connect(ctx)
defer cancel() defer cancel()