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ipn: add AllowVersionSkew bool to Notify & Message

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For "tailscale status" on macOS (from separately downloaded
cmd/tailscale binary against App Store IPNExtension).

(This isn't all of it, but I've had this sitting around uncommitted.)
This commit is contained in:
Brad Fitzpatrick 2020-05-09 13:50:13 -07:00
parent fde384b359
commit 529e2cb31a
2 changed files with 17 additions and 4 deletions
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2
cmd/tailscale/status.go
View File

@ -48,6 +48,8 @@ func runStatus(ctx context.Context, args []string) error {
c, bc, ctx, cancel := connect(ctx) c, bc, ctx, cancel := connect(ctx)
defer cancel() defer cancel()
bc.AllowVersionSkew = true
ch := make(chan *ipnstate.Status, 1) ch := make(chan *ipnstate.Status, 1)
bc.SetNotifyCallback(func(n ipn.Notify) { bc.SetNotifyCallback(func(n ipn.Notify) {
if n.ErrMessage != nil { if n.ErrMessage != nil {

19
ipn/message.go
View File

@ -35,9 +35,16 @@ type FakeExpireAfterArgs struct {
// Command is a command message that is JSON encoded and sent by a // Command is a command message that is JSON encoded and sent by a
// frontend to a backend. // frontend to a backend.
type Command struct { type Command struct {
_ structs.Incomparable _ structs.Incomparable
// Version is the binary version of the frontend (the client).
Version string Version string
// AllowVersionSkew controls whether it's permitted for the
// client and server to have a different version. The default
// (false) means to be strict.
AllowVersionSkew bool
// Exactly one of the following must be non-nil. // Exactly one of the following must be non-nil.
Quit *NoArgs Quit *NoArgs
Start *StartArgs Start *StartArgs
@ -92,7 +99,7 @@ func (bs *BackendServer) GotFakeCommand(cmd *Command) error {
} }
func (bs *BackendServer) GotCommand(cmd *Command) error { func (bs *BackendServer) GotCommand(cmd *Command) error {
if cmd.Version != version.LONG { if cmd.Version != version.LONG && !cmd.AllowVersionSkew {
vs := fmt.Sprintf("GotCommand: Version mismatch! frontend=%#v backend=%#v", vs := fmt.Sprintf("GotCommand: Version mismatch! frontend=%#v backend=%#v",
cmd.Version, version.LONG) cmd.Version, version.LONG)
bs.logf("%s", vs) bs.logf("%s", vs)
@ -147,6 +154,10 @@ type BackendClient struct {
logf logger.Logf logf logger.Logf
sendCommandMsg func(jsonb []byte) sendCommandMsg func(jsonb []byte)
notify func(Notify) notify func(Notify)
// AllowVersionSkew controls whether to allow mismatched
// frontend & backend versions.
AllowVersionSkew bool
} }
func NewBackendClient(logf logger.Logf, sendCommandMsg func(jsonb []byte)) *BackendClient { func NewBackendClient(logf logger.Logf, sendCommandMsg func(jsonb []byte)) *BackendClient {
@ -165,7 +176,7 @@ func (bc *BackendClient) GotNotifyMsg(b []byte) {
if err := json.Unmarshal(b, &n); err != nil { if err := json.Unmarshal(b, &n); err != nil {
log.Fatalf("BackendClient.Notify: cannot decode message (length=%d)\n%#v", len(b), string(b)) log.Fatalf("BackendClient.Notify: cannot decode message (length=%d)\n%#v", len(b), string(b))
} }
if n.Version != version.LONG { if n.Version != version.LONG && !bc.AllowVersionSkew {
vs := fmt.Sprintf("GotNotify: Version mismatch! frontend=%#v backend=%#v", vs := fmt.Sprintf("GotNotify: Version mismatch! frontend=%#v backend=%#v",
version.LONG, n.Version) version.LONG, n.Version)
bc.logf("%s", vs) bc.logf("%s", vs)
@ -223,7 +234,7 @@ func (bc *BackendClient) RequestEngineStatus() {
} }
func (bc *BackendClient) RequestStatus() { func (bc *BackendClient) RequestStatus() {
bc.send(Command{RequestStatus: &NoArgs{}}) bc.send(Command{AllowVersionSkew: true, RequestStatus: &NoArgs{}})
} }
func (bc *BackendClient) FakeExpireAfter(x time.Duration) { func (bc *BackendClient) FakeExpireAfter(x time.Duration) {