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controlclient

package
v1.92.2Latest Latest
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Published: Dec 10, 2025 License:BSD-3-ClauseImports:69Imported by:29

Details

Repository

github.com/tailscale/tailscale

Links

Documentation

Overview

Package controlclient implements the client for the Tailscalecontrol plane.

It handles authentication, port picking, and collects the localnetwork configuration.

Index

Constants

View Source
const (LoginDefault     =LoginFlags(0)LoginInteractive =LoginFlags(1 <<iota)// force user login and key refreshLoginEphemeral// set RegisterRequest.Ephemeral// LocalBackendStartKeyOSNeutral instructs NewLocalBackend to start the// LocalBackend without any OS-dependent StateStore StartKey behavior.//// Seehttps://github.com/tailscale/tailscale/issues/6973.LocalBackendStartKeyOSNeutral)

Variables

View Source
var DevKnob = initDevKnob()

DevKnob contains temporary internal-only debug knobs.They're unexported to not draw attention to them.

View Source
var ErrClientClosed =errors.New("client closed")

HookAnswerC2NPing is where feature/c2n conditionally registers supportfor handling C2N (control-to-node) HTTP requests.

Functions

funcHashRegisterRequestadded inv1.8.0

func HashRegisterRequest(versiontailcfg.SignatureType, tstime.Time, serverURLstring, deviceCert []byte,serverPubKey, machinePubKeykey.MachinePublic) ([]byte,error)

HashRegisterRequest generates the hash required sign or verify atailcfg.RegisterRequest.

funcNetmapFromMapResponseForDebugadded inv1.90.0

func NetmapFromMapResponseForDebug(ctxcontext.Context, prpersist.PersistView, resp *tailcfg.MapResponse) (*netmap.NetworkMap,error)

NetmapFromMapResponseForDebug returns a NetworkMap from the given MapResponse.It is intended for debugging only.

Types

typeAutoadded inv1.8.0

type Auto struct {// contains filtered or unexported fields}

Auto connects to a tailcontrol server for a node.It's a concrete implementation of the Client interface.

funcNew

func New(optsOptions) (*Auto,error)

New creates and starts a new Auto.

func (*Auto)AuthCantContinueadded inv1.8.0

func (c *Auto) AuthCantContinue()bool

func (*Auto)ClientIDadded inv1.90.0

func (c *Auto) ClientID()int64

ClientID returns the ClientID of the direct controlClient

func (*Auto)DirectForTestadded inv1.50.0

func (c *Auto) DirectForTest() *Direct

DirectForTest returns the underlying direct client object.It's used in tests only.

func (*Auto)DoNoiseRequestadded inv1.24.0

func (c *Auto) DoNoiseRequest(req *http.Request) (*http.Response,error)

func (*Auto)ExpiryForTestsadded inv1.50.0

func (c *Auto) ExpiryForTests()time.Time

ExpiryForTests returns the credential expiration time, or the zero value ifthe expiration time isn't known. It's used in tests only.

func (*Auto)Loginadded inv1.8.0

func (c *Auto) Login(flagsLoginFlags)

func (*Auto)Logoutadded inv1.8.0

func (c *Auto) Logout(ctxcontext.Context)error

func (*Auto)SendAuditLogadded inv1.82.0

func (c *Auto) SendAuditLog(ctxcontext.Context, auditLogtailcfg.AuditLogRequest) (errerror)

SendAuditLog implements [auditlog.Transport] by sending an audit log synchronously to the control plane.

See docs ontailcfg.AuditLogRequest and [auditlog.Logger] for background.

func (*Auto)SetDNSadded inv1.10.0

func (c *Auto) SetDNS(ctxcontext.Context, req *tailcfg.SetDNSRequest)error

SetDNS sends the SetDNSRequest request to the control plane server,requesting a DNS record be created or updated.

func (*Auto)SetDeviceAttrsadded inv1.80.0

func (c *Auto) SetDeviceAttrs(ctxcontext.Context, attrstailcfg.AttrUpdate)error

SetDeviceAttrs does a synchronous call to the control plane to updatethe node's attributes.

See docs ontailcfg.SetDeviceAttributesRequest for background.

func (*Auto)SetDiscoPublicKeyadded inv1.92.0

func (c *Auto) SetDiscoPublicKey(keykey.DiscoPublic)

SetDiscoPublicKey sets the client's Disco public to key and sends the changeto the control server.

func (*Auto)SetExpirySooneradded inv1.24.0

func (c *Auto) SetExpirySooner(ctxcontext.Context, expirytime.Time)error

func (*Auto)SetHostinfoadded inv1.8.0

func (c *Auto) SetHostinfo(hi *tailcfg.Hostinfo)

func (*Auto)SetNetInfoadded inv1.8.0

func (c *Auto) SetNetInfo(ni *tailcfg.NetInfo)

func (*Auto)SetPausedadded inv1.8.0

func (c *Auto) SetPaused(pausedbool)

SetPaused controls whether HTTP activity should be paused.

The client can be paused and unpaused repeatedly, unlike Start and Shutdown, which can only be used once.

func (*Auto)SetTKAHeadadded inv1.34.0

func (c *Auto) SetTKAHead(headHashstring)

SetTKAHead updates the TKA head hash that map-request infrastructure sends.

func (*Auto)Shutdownadded inv1.8.0

func (c *Auto) Shutdown()

func (*Auto)StartForTestadded inv1.92.0

func (c *Auto) StartForTest()

StartForTest starts the client's goroutines.

It should only be called for clients created with [Options.SkipStartForTests].

func (*Auto)TestOnlyNodePublicKeyadded inv1.8.0

func (c *Auto) TestOnlyNodePublicKey()key.NodePublic

NodePublicKey returns the node public key currently in use. This isused exclusively in tests.

func (*Auto)TestOnlySetAuthKeyadded inv1.8.0

func (c *Auto) TestOnlySetAuthKey(authkeystring)

func (*Auto)TestOnlyTimeNowadded inv1.8.0

func (c *Auto) TestOnlyTimeNow()time.Time

func (*Auto)UpdateEndpointsadded inv1.8.0

func (c *Auto) UpdateEndpoints(endpoints []tailcfg.Endpoint)

UpdateEndpoints sets the client's discovered endpoints and sendsthem to the control server if they've changed.

It does not retain the provided slice.

typeAutoUpdateadded inv1.90.0

type AutoUpdate struct {ClientIDint64// The ID field is used for consumers to differentiate instances of Direct.Valuebool// The Value represents DefaultAutoUpdate from [tailcfg.MapResponse].}

AutoUpdate is an eventbus value, reporting the value of tailcfg.MapResponse.DefaultAutoUpdate.

typeClient

type Client interface {// Shutdown closes this session, which should not be used any further// afterwards.Shutdown()// Login begins an interactive or non-interactive login process.// Client will eventually call the Status callback with either a// LoginFinished flag (on success) or an auth URL (if further// interaction is needed). It merely sets the process in motion,// and doesn't wait for it to complete.Login(LoginFlags)// Logout starts a synchronous logout process. It doesn't return// until the logout operation has been completed.Logout(context.Context)error// SetPaused pauses or unpauses the controlclient activity as much// as possible, without losing its internal state, to minimize// unnecessary network activity.// TODO: It might be better to simply shutdown the controlclient and// make a new one when it's time to unpause.SetPaused(bool)// AuthCantContinue returns whether authentication is blocked. If it// is, you either need to visit the auth URL (previously sent in a// Status callback) or call the Login function appropriately.// TODO: this probably belongs in the Status itself instead.AuthCantContinue()bool// SetHostinfo changes the Hostinfo structure that will be sent in// subsequent node registration requests.// TODO: a server-side change would let us simply upload this// in a separate http request. It has nothing to do with the rest of// the state machine.SetHostinfo(*tailcfg.Hostinfo)// SetNetinfo changes the NetIinfo structure that will be sent in// subsequent node registration requests.// TODO: a server-side change would let us simply upload this// in a separate http request. It has nothing to do with the rest of// the state machine.SetNetInfo(*tailcfg.NetInfo)// SetTKAHead changes the TKA head hash value that will be sent in// subsequent netmap requests.SetTKAHead(headHashstring)// UpdateEndpoints changes the Endpoint structure that will be sent// in subsequent node registration requests.// TODO: a server-side change would let us simply upload this// in a separate http request. It has nothing to do with the rest of// the state machine.// Note: the auto client uploads the new endpoints to control immediately.UpdateEndpoints(endpoints []tailcfg.Endpoint)// SetDiscoPublicKey updates the disco public key that will be sent in// future map requests. This should be called after rotating the discovery key.// Note: the auto client uploads the new key to control immediately.SetDiscoPublicKey(key.DiscoPublic)// ClientID returns the ClientID of a client. This ID is meant to// distinguish one client from another.ClientID()int64}

Client represents a client connection to the control server.Currently this is done through a pair of polling https requests inthe Auto client, but that might change eventually.

The Client must be comparable as it is used by the Observer to detect staleclients.

typeControlDialPlanneradded inv1.32.0

type ControlDialPlanner interface {// Load returns the current plan for how to connect to control.//// The returned plan can be nil. If so, connections should be made by// resolving the control URL using DNS.Load() *tailcfg.ControlDialPlan// Store updates the dial plan with new directions from the control// server.//// The dial plan can span multiple connections to the control server.// That is, a dial plan received when connected over Wi-Fi is still// valid for a subsequent connection over LTE after a network switch.Store(*tailcfg.ControlDialPlan)}

ControlDialPlanner is the interface optionally supplied when creating acontrol client to control exactly how TCP connections to the control planeare dialed.

It is usually implemented by an atomic.Pointer.

typeControlTimeadded inv1.90.0

type ControlTime struct {ClientIDint64// The ID field is used for consumers to differentiate instances of Direct.Valuetime.Time// The Value represents ControlTime from [tailcfg.MapResponse].}

ControlTime is an eventbus value, reporting the value of tailcfg.MapResponse.ControlTime.

typeDirect

type Direct struct {// contains filtered or unexported fields}

Direct is the client that connects to a tailcontrol server for a node.

funcNewDirect

func NewDirect(optsOptions) (*Direct,error)

NewDirect returns a new Direct client.

func (*Direct)ClientIDadded inv1.90.0

func (c *Direct) ClientID()int64

ClientID returns the controlClientID of the controlClient.

func (*Direct)Closeadded inv1.24.0

func (c *Direct) Close()error

Close closes the underlying Noise connection(s).

func (*Direct)DoNoiseRequestadded inv1.24.0

func (c *Direct) DoNoiseRequest(req *http.Request) (*http.Response,error)

func (*Direct)FetchNetMapForTestadded inv1.48.0

func (c *Direct) FetchNetMapForTest(ctxcontext.Context) (*netmap.NetworkMap,error)

FetchNetMapForTest fetches the netmap once.

func (*Direct)GetPersist

func (c *Direct) GetPersist()persist.PersistView

func (*Direct)PollNetMap

func (c *Direct) PollNetMap(ctxcontext.Context, nuNetmapUpdater)error

PollNetMap makes a /map request to download the network map, callingNetmapUpdater on each update from the control plane.

It always returns a non-nil error describing the reason for the failure orwhy the request ended.

func (*Direct)SendUpdateadded inv1.48.0

func (c *Direct) SendUpdate(ctxcontext.Context)error

SendUpdate makes a /map request to update the server of our latest state, butdoes not fetch anything. It returns an error if the server did not return asuccessful 200 OK response.

func (*Direct)SetConnectionHandleForTestadded inv1.84.0

func (c *Direct) SetConnectionHandleForTest(handlestring)

SetConnectionHandleForTest stores a new MapRequest.ConnectionHandleForTestvalue for the next update.

func (*Direct)SetDNSadded inv1.10.0

func (c *Direct) SetDNS(ctxcontext.Context, req *tailcfg.SetDNSRequest) (errerror)

SetDNS sends the SetDNSRequest request to the control plane server,requesting a DNS record be created or updated.

func (*Direct)SetDeviceAttrsadded inv1.80.0

func (c *Direct) SetDeviceAttrs(ctxcontext.Context, attrstailcfg.AttrUpdate)error

SetDeviceAttrs does a synchronous call to the control plane to updatethe node's attributes.

See docs ontailcfg.SetDeviceAttributesRequest for background.

func (*Direct)SetDiscoPublicKeyadded inv1.92.0

func (c *Direct) SetDiscoPublicKey(keykey.DiscoPublic)

SetDiscoPublicKey updates the disco public key in local state.It does not implicitly trigger [SendUpdate]; callers should arrange for that.

func (*Direct)SetEndpoints

func (c *Direct) SetEndpoints(endpoints []tailcfg.Endpoint) (changedbool)

SetEndpoints updates the list of locally advertised endpoints.It won't be replicated to the server until a *fresh* call to PollNetMap().You don't need to restart PollNetMap if we return changed==false.

func (*Direct)SetExpirySooneradded inv1.24.0

func (c *Direct) SetExpirySooner(ctxcontext.Context, expirytime.Time)error

SetExpirySooner attempts to shorten the expiry to the specified time.

func (*Direct)SetHostinfo

func (c *Direct) SetHostinfo(hi *tailcfg.Hostinfo)bool

SetHostinfo clones the provided Hostinfo and remembers it for thenext update. It reports whether the Hostinfo has changed.

func (*Direct)SetNetInfo

func (c *Direct) SetNetInfo(ni *tailcfg.NetInfo)bool

SetNetInfo clones the provided NetInfo and remembers it for thenext update. It reports whether the NetInfo has changed.

func (*Direct)SetTKAHeadadded inv1.34.0

func (c *Direct) SetTKAHead(tkaHeadstring)bool

SetTKAHead stores a new TKA head value for next update.It reports whether the TKA head changed.

func (*Direct)TryLogin

func (c *Direct) TryLogin(ctxcontext.Context, flagsLoginFlags) (urlstring, errerror)

func (*Direct)TryLogout

func (c *Direct) TryLogout(ctxcontext.Context)error

func (*Direct)WaitLoginURL

func (c *Direct) WaitLoginURL(ctxcontext.Context, urlstring) (newURLstring, errerror)

WaitLoginURL sits in a long poll waiting for the user to authenticate at url.

On success, newURL and err will both be nil.

typeLoginFlags

type LoginFlagsint

LoginFlags is a bitmask of options to change the behavior of Client.Loginand LocalBackend.

typeLoginGoal

type LoginGoal struct {// contains filtered or unexported fields}

typeNetmapDeltaUpdateradded inv1.50.0

type NetmapDeltaUpdater interface {// UpdateNetmapDelta is called with discrete changes to the network map.//// The ok result is whether the implementation was able to apply the// mutations. It might return false if its internal state doesn't// support applying them or a NetmapUpdater it's wrapping doesn't// implement the NetmapDeltaUpdater optional method.UpdateNetmapDelta([]netmap.NodeMutation) (okbool)}

NetmapDeltaUpdater is an optional interface that can be implemented byNetmapUpdater implementations to receive delta updates from the controlclientrather than just full updates.

typeNetmapUpdateradded inv1.48.0

type NetmapUpdater interface {UpdateFullNetmap(*netmap.NetworkMap)}

NetmapUpdater is the interface needed by the controlclient to enact change inthe world as a function of updates received from the network.

typeObserveradded inv1.50.0

type Observer interface {// SetControlClientStatus is called when the client has a new status to// report. The Client is provided to allow the Observer to track which// Client is reporting the status, allowing it to ignore stale status// reports from previous Clients.SetControlClientStatus(Client,Status)}

Observer is implemented by users of the control client (such as LocalBackend)to get notified of changes in the control client's status.

If an implementation of Observer also implementsNetmapDeltaUpdater, they getdelta updates as well as full netmap updates.

typeOptions

type Options struct {Persistpersist.Persist// initial persistent dataGetMachinePrivateKey func() (key.MachinePrivate,error)// returns the machine key to useServerURLstring// URL of the tailcontrol serverAuthKeystring// optional node auth key for auto registrationClocktstime.ClockHostinfo             *tailcfg.Hostinfo// non-nil passes ownership, nil means to use default using os.Hostname, etcDiscoPublicKeykey.DiscoPublicPolicyClientpolicyclient.Client// or nil for noneLogflogger.LogfHTTPTestClient       *http.Client// optional HTTP client to use (for tests only)NoiseTestClient      *http.Client// optional HTTP client to use for noise RPCs (tests only)DebugFlags           []string// debug settings to send to controlHealthTracker        *health.TrackerPopBrowserURL        func(urlstring)// optional func to open browserDialer               *tsdial.Dialer// non-nilC2NHandlerhttp.Handler// or nilControlKnobs         *controlknobs.Knobs// or nil to ignoreBus                  *eventbus.Bus// non-nil, for setting up publishersSkipStartForTestsbool// if true, don't call [Auto.Start] to avoid any background goroutines (for tests only)// StartPaused indicates whether the client should start in a paused state// where it doesn't do network requests. This primarily exists for testing// but not necessarily "go test" tests, so it isn't restricted to only// being used in tests.StartPausedbool// Observer is called when there's a change in status to report// from the control client.// If nil, no status updates are reported.ObserverObserver// SkipIPForwardingCheck declares that the host's IP// forwarding works and should not be double-checked by the// controlclient package.SkipIPForwardingCheckbool// Pinger optionally specifies the Pinger to use to satisfy// MapResponse.PingRequest queries from the control plane.// If nil, PingRequest queries are not answered.PingerPinger// DialPlan contains and stores a previous dial plan that we received// from the control server; if nil, we fall back to using DNS.//// If we receive a new DialPlan from the server, this value will be// updated.DialPlanControlDialPlanner// Shutdown is an optional function that will be called before client shutdown is// attempted. It is used to allow the client to clean up any resources or complete any// tasks that are dependent on a live client.Shutdown func()}

typePingeradded inv1.10.0

type Pinger interface {// Ping is a request to do a ping with the peer handling the given IP.Ping(ctxcontext.Context, ipnetip.Addr, pingTypetailcfg.PingType, sizeint) (*ipnstate.PingResult,error)}

Pinger is the LocalBackend.Ping method.

typeStatus

type Status struct {// Err, if non-nil, is an error that occurred while logging in.//// If it's of type UserVisibleError then it's meant to be shown to users in// their Tailscale client. Otherwise it's just logged to tailscaled's logs.Errerror// URL, if non-empty, is the interactive URL to visit to finish logging in.URLstring// LoggedIn, if true, indicates that serveRegister has completed and no// other login change is in progress.LoggedInbool// InMapPoll, if true, indicates that we've received at least one netmap// and are connected to receive updates.InMapPollbool// NetMap is the latest server-pushed state of the tailnet network.NetMap *netmap.NetworkMap// Persist, when Valid, is the locally persisted configuration.//// TODO(bradfitz,maisem): clarify this.Persistpersist.PersistView// contains filtered or unexported fields}

func (*Status)Equal

func (s *Status) Equal(s2 *Status)bool

Equal reports whether s and s2 are equal.

typeUserVisibleErroradded inv1.18.0

type UserVisibleErrorstring

UserVisibleError is an error that should be shown to users.

func (UserVisibleError)Erroradded inv1.18.0

func (eUserVisibleError) Error()string

func (UserVisibleError)UserVisibleErroradded inv1.18.0

func (eUserVisibleError) UserVisibleError()string

Source Files

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