mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-25 19:15:34 +00:00
508980603b
Fixes #13772 Change-Id: I3ae03a5ee48c801f2e5ea12d1e54681df25d4604 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
// Package conffile contains code to load, manipulate, and access config file
|
|
// settings.
|
|
package conffile
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"os"
|
|
"runtime"
|
|
|
|
"tailscale.com/ipn"
|
|
)
|
|
|
|
// Config describes a config file.
|
|
type Config struct {
|
|
Path string // disk path of HuJSON, or VMUserDataPath
|
|
Raw []byte // raw bytes from disk, in HuJSON form
|
|
Std []byte // standardized JSON form
|
|
Version string // "alpha0" for now
|
|
|
|
// Parsed is the parsed config, converted from its on-disk version to the
|
|
// latest known format.
|
|
//
|
|
// As of 2023-10-15 there is exactly one format ("alpha0") so this is both
|
|
// the on-disk format and the in-memory upgraded format.
|
|
Parsed ipn.ConfigVAlpha
|
|
}
|
|
|
|
// WantRunning reports whether c is non-nil and it's configured to be running.
|
|
func (c *Config) WantRunning() bool {
|
|
return c != nil && !c.Parsed.Enabled.EqualBool(false)
|
|
}
|
|
|
|
// VMUserDataPath is a sentinel value for Load to use to get the data
|
|
// from the VM's metadata service's user-data field.
|
|
const VMUserDataPath = "vm:user-data"
|
|
|
|
// hujsonStandardize is set to hujson.Standardize by conffile_hujson.go on
|
|
// platforms that support config files.
|
|
var hujsonStandardize func([]byte) ([]byte, error)
|
|
|
|
// Load reads and parses the config file at the provided path on disk.
|
|
func Load(path string) (*Config, error) {
|
|
switch runtime.GOOS {
|
|
case "ios", "android":
|
|
// compile-time for deadcode elimination
|
|
return nil, fmt.Errorf("config file loading not supported on %q", runtime.GOOS)
|
|
}
|
|
if hujsonStandardize == nil {
|
|
// Build tags are wrong in conffile_hujson.go
|
|
return nil, errors.New("[unexpected] config file loading not wired up")
|
|
}
|
|
var c Config
|
|
c.Path = path
|
|
var err error
|
|
|
|
switch path {
|
|
case VMUserDataPath:
|
|
c.Raw, err = readVMUserData()
|
|
default:
|
|
c.Raw, err = os.ReadFile(path)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.Std, err = hujsonStandardize(c.Raw)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing config file %s HuJSON/JSON: %w", path, err)
|
|
}
|
|
var ver struct {
|
|
Version string `json:"version"`
|
|
}
|
|
if err := json.Unmarshal(c.Std, &ver); err != nil {
|
|
return nil, fmt.Errorf("error parsing config file %s: %w", path, err)
|
|
}
|
|
switch ver.Version {
|
|
case "":
|
|
return nil, fmt.Errorf("error parsing config file %s: no \"version\" field defined", path)
|
|
case "alpha0":
|
|
default:
|
|
return nil, fmt.Errorf("error parsing config file %s: unsupported \"version\" value %q; want \"alpha0\" for now", path, ver.Version)
|
|
}
|
|
c.Version = ver.Version
|
|
|
|
jd := json.NewDecoder(bytes.NewReader(c.Std))
|
|
jd.DisallowUnknownFields()
|
|
err = jd.Decode(&c.Parsed)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing config file %s: %w", path, err)
|
|
}
|
|
if jd.More() {
|
|
return nil, fmt.Errorf("error parsing config file %s: trailing data after JSON object", path)
|
|
}
|
|
return &c, nil
|
|
}
|