115 lines
4.0 KiB
Go
115 lines
4.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package ipn
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"strconv"
|
|
)
|
|
|
|
// ErrStateNotExist is returned by StateStore.ReadState when the
|
|
// requested state ID doesn't exist.
|
|
var ErrStateNotExist = errors.New("no state with given ID")
|
|
|
|
const (
|
|
// MachineKeyStateKey is the key under which we store the machine key,
|
|
// in its key.NodePrivate.MarshalText representation.
|
|
MachineKeyStateKey = StateKey("_machinekey")
|
|
|
|
// LegacyGlobalDaemonStateKey is the ipn.StateKey that tailscaled
|
|
// loads on startup.
|
|
//
|
|
// We have to support multiple state keys for other OSes (Windows in
|
|
// particular), but right now Unix daemons run with a single
|
|
// node-global state. To keep open the option of having per-user state
|
|
// later, the global state key doesn't look like a username.
|
|
//
|
|
// As of 2022-10-21, it has been superseded by profiles and is no longer
|
|
// written to disk. It is only read at startup when there are no profiles,
|
|
// to migrate the state to the "default" profile.
|
|
// The existing state is left on disk in case the user downgrades to an
|
|
// older version of Tailscale that doesn't support profiles. We can
|
|
// remove this in a future release.
|
|
LegacyGlobalDaemonStateKey = StateKey("_daemon")
|
|
|
|
// ServerModeStartKey's value, if non-empty, is the value of a
|
|
// StateKey containing the prefs to start with which to start the
|
|
// server.
|
|
//
|
|
// For example, the value might be "user-1234", meaning the
|
|
// the server should start with the Prefs JSON loaded from
|
|
// StateKey "user-1234".
|
|
ServerModeStartKey = StateKey("server-mode-start-key")
|
|
|
|
// KnownProfilesStateKey is the key under which we store the list of
|
|
// known profiles. The value is a JSON-encoded []LoginProfile.
|
|
KnownProfilesStateKey = StateKey("_profiles")
|
|
|
|
// CurrentProfileStateKey is the key under which we store the current
|
|
// profile.
|
|
CurrentProfileStateKey = StateKey("_current-profile")
|
|
|
|
// TaildropReceivedKey is the key to indicate whether any taildrop file
|
|
// has ever been received (even if partially).
|
|
// Any non-empty value indicates that at least one file has been received.
|
|
TaildropReceivedKey = StateKey("_taildrop-received")
|
|
)
|
|
|
|
// CurrentProfileID returns the StateKey that stores the
|
|
// current profile ID. The value is a JSON-encoded LoginProfile.
|
|
// If the userID is empty, the key returned is CurrentProfileStateKey,
|
|
// otherwise it is "_current/"+userID.
|
|
func CurrentProfileKey(userID string) StateKey {
|
|
if userID == "" {
|
|
return CurrentProfileStateKey
|
|
}
|
|
return StateKey("_current/" + userID)
|
|
}
|
|
|
|
// StateStore persists state, and produces it back on request.
|
|
type StateStore interface {
|
|
// ReadState returns the bytes associated with ID. Returns (nil,
|
|
// ErrStateNotExist) if the ID doesn't have associated state.
|
|
ReadState(id StateKey) ([]byte, error)
|
|
// WriteState saves bs as the state associated with ID.
|
|
//
|
|
// Callers should generally use the ipn.WriteState wrapper func
|
|
// instead, which only writes if the value is different from what's
|
|
// already in the store.
|
|
WriteState(id StateKey, bs []byte) error
|
|
}
|
|
|
|
// WriteState is a wrapper around store.WriteState that only writes if
|
|
// the value is different from what's already in the store.
|
|
func WriteState(store StateStore, id StateKey, v []byte) error {
|
|
if was, err := store.ReadState(id); err == nil && bytes.Equal(was, v) {
|
|
return nil
|
|
}
|
|
return store.WriteState(id, v)
|
|
}
|
|
|
|
// StateStoreDialerSetter is an optional interface that StateStores
|
|
// can implement to allow the caller to set a custom dialer.
|
|
type StateStoreDialerSetter interface {
|
|
SetDialer(d func(ctx context.Context, network, address string) (net.Conn, error))
|
|
}
|
|
|
|
// ReadStoreInt reads an integer from a StateStore.
|
|
func ReadStoreInt(store StateStore, id StateKey) (int64, error) {
|
|
v, err := store.ReadState(id)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return strconv.ParseInt(string(v), 10, 64)
|
|
}
|
|
|
|
// PutStoreInt puts an integer into a StateStore.
|
|
func PutStoreInt(store StateStore, id StateKey, val int64) error {
|
|
return WriteState(store, id, fmt.Appendf(nil, "%d", val))
|
|
}
|