syncthing/internal/config/config.go

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// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
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// Package config implements reading and writing of the syncthing configuration file.
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package config
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import (
"encoding/xml"
"fmt"
"io"
"math/rand"
"os"
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"path/filepath"
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"reflect"
"sort"
"strconv"
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"strings"
"github.com/calmh/logger"
"github.com/syncthing/protocol"
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"github.com/syncthing/syncthing/internal/osutil"
"golang.org/x/crypto/bcrypt"
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)
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var l = logger.DefaultLogger
const CurrentVersion = 9
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type Configuration struct {
Version int `xml:"version,attr" json:"version"`
Folders []FolderConfiguration `xml:"folder" json:"folders"`
Devices []DeviceConfiguration `xml:"device" json:"devices"`
GUI GUIConfiguration `xml:"gui" json:"gui"`
Options OptionsConfiguration `xml:"options" json:"options"`
IgnoredDevices []protocol.DeviceID `xml:"ignoredDevice" json:"ignoredDevices"`
XMLName xml.Name `xml:"configuration" json:"-"`
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OriginalVersion int `xml:"-" json:"-"` // The version we read from disk, before any conversion
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Deprecated_Repositories []FolderConfiguration `xml:"repository" json:"-"`
Deprecated_Nodes []DeviceConfiguration `xml:"node" json:"-"`
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}
type FolderConfiguration struct {
ID string `xml:"id,attr" json:"id"`
Path string `xml:"path,attr" json:"path"`
Devices []FolderDeviceConfiguration `xml:"device" json:"devices"`
ReadOnly bool `xml:"ro,attr" json:"readOnly"`
RescanIntervalS int `xml:"rescanIntervalS,attr" json:"rescanIntervalS" default:"60"`
IgnorePerms bool `xml:"ignorePerms,attr" json:"ignorePerms"`
AutoNormalize bool `xml:"autoNormalize,attr" json:"autoNormalize" default:"true"`
Versioning VersioningConfiguration `xml:"versioning" json:"versioning"`
LenientMtimes bool `xml:"lenientMtimes" json:"lenientMTimes"`
Copiers int `xml:"copiers" json:"copiers" default:"1"` // This defines how many files are handled concurrently.
Pullers int `xml:"pullers" json:"pullers" default:"16"` // Defines how many blocks are fetched at the same time, possibly between separate copier routines.
Hashers int `xml:"hashers" json:"hashers" default:"0"` // Less than one sets the value to the number of cores. These are CPU bound due to hashing.
Invalid string `xml:"-" json:"invalid"` // Set at runtime when there is an error, not saved
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deviceIDs []protocol.DeviceID
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Deprecated_Directory string `xml:"directory,omitempty,attr" json:"-"`
Deprecated_Nodes []FolderDeviceConfiguration `xml:"node" json:"-"`
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}
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func (f *FolderConfiguration) CreateMarker() error {
if !f.HasMarker() {
marker := filepath.Join(f.Path, ".stfolder")
fd, err := os.Create(marker)
if err != nil {
return err
}
fd.Close()
osutil.HideFile(marker)
}
return nil
}
func (f *FolderConfiguration) HasMarker() bool {
_, err := os.Stat(filepath.Join(f.Path, ".stfolder"))
if err != nil {
return false
}
return true
}
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func (f *FolderConfiguration) DeviceIDs() []protocol.DeviceID {
if f.deviceIDs == nil {
for _, n := range f.Devices {
f.deviceIDs = append(f.deviceIDs, n.DeviceID)
}
}
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return f.deviceIDs
}
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type VersioningConfiguration struct {
Type string `xml:"type,attr" json:"type"`
Params map[string]string `json:"params"`
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}
type InternalVersioningConfiguration struct {
Type string `xml:"type,attr,omitempty"`
Params []InternalParam `xml:"param"`
}
type InternalParam struct {
Key string `xml:"key,attr"`
Val string `xml:"val,attr"`
}
func (c *VersioningConfiguration) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
var tmp InternalVersioningConfiguration
tmp.Type = c.Type
for k, v := range c.Params {
tmp.Params = append(tmp.Params, InternalParam{k, v})
}
return e.EncodeElement(tmp, start)
}
func (c *VersioningConfiguration) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
var tmp InternalVersioningConfiguration
err := d.DecodeElement(&tmp, &start)
if err != nil {
return err
}
c.Type = tmp.Type
c.Params = make(map[string]string, len(tmp.Params))
for _, p := range tmp.Params {
c.Params[p.Key] = p.Val
}
return nil
}
type DeviceConfiguration struct {
DeviceID protocol.DeviceID `xml:"id,attr" json:"deviceID"`
Name string `xml:"name,attr,omitempty" json:"name"`
Addresses []string `xml:"address,omitempty" json:"addresses"`
Compression protocol.Compression `xml:"compression,attr" json:"compression"`
CertName string `xml:"certName,attr,omitempty" json:"certName"`
Introducer bool `xml:"introducer,attr" json:"introducer"`
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}
type FolderDeviceConfiguration struct {
DeviceID protocol.DeviceID `xml:"id,attr" json:"deviceID"`
Deprecated_Name string `xml:"name,attr,omitempty" json:"-"`
Deprecated_Addresses []string `xml:"address,omitempty" json:"-"`
}
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type OptionsConfiguration struct {
ListenAddress []string `xml:"listenAddress" json:"listenAddress" default:"0.0.0.0:22000"`
GlobalAnnServers []string `xml:"globalAnnounceServer" json:"globalAnnounceServers" json:"globalAnnounceServer" default:"udp4://announce.syncthing.net:22026, udp6://announce-v6.syncthing.net:22026"`
GlobalAnnEnabled bool `xml:"globalAnnounceEnabled" json:"globalAnnounceEnabled" default:"true"`
LocalAnnEnabled bool `xml:"localAnnounceEnabled" json:"localAnnounceEnabled" default:"true"`
LocalAnnPort int `xml:"localAnnouncePort" json:"localAnnouncePort" default:"21025"`
LocalAnnMCAddr string `xml:"localAnnounceMCAddr" json:"localAnnounceMCAddr" default:"[ff32::5222]:21026"`
MaxSendKbps int `xml:"maxSendKbps" json:"maxSendKbps"`
MaxRecvKbps int `xml:"maxRecvKbps" json:"maxRecvKbps"`
ReconnectIntervalS int `xml:"reconnectionIntervalS" json:"reconnectionIntervalS" default:"60"`
StartBrowser bool `xml:"startBrowser" json:"startBrowser" default:"true"`
UPnPEnabled bool `xml:"upnpEnabled" json:"upnpEnabled" default:"true"`
UPnPLease int `xml:"upnpLeaseMinutes" json:"upnpLeaseMinutes" default:"0"`
UPnPRenewal int `xml:"upnpRenewalMinutes" json:"upnpRenewalMinutes" default:"30"`
URAccepted int `xml:"urAccepted" json:"urAccepted"` // Accepted usage reporting version; 0 for off (undecided), -1 for off (permanently)
URUniqueID string `xml:"urUniqueID" json:"urUniqueId"` // Unique ID for reporting purposes, regenerated when UR is turned on.
RestartOnWakeup bool `xml:"restartOnWakeup" json:"restartOnWakeup" default:"true"`
AutoUpgradeIntervalH int `xml:"autoUpgradeIntervalH" json:"autoUpgradeIntervalH" default:"12"` // 0 for off
KeepTemporariesH int `xml:"keepTemporariesH" json:"keepTemporariesH" default:"24"` // 0 for off
CacheIgnoredFiles bool `xml:"cacheIgnoredFiles" json:"cacheIgnoredFiles" default:"true"`
ProgressUpdateIntervalS int `xml:"progressUpdateIntervalS" json:"progressUpdateIntervalS" default:"5"`
SymlinksEnabled bool `xml:"symlinksEnabled" json:"symlinksEnabled" default:"true"`
LimitBandwidthInLan bool `xml:"limitBandwidthInLan" json:"limitBandwidthInLan" default:"false"`
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Deprecated_RescanIntervalS int `xml:"rescanIntervalS,omitempty" json:"-"`
Deprecated_UREnabled bool `xml:"urEnabled,omitempty" json:"-"`
Deprecated_URDeclined bool `xml:"urDeclined,omitempty" json:"-"`
Deprecated_ReadOnly bool `xml:"readOnly,omitempty" json:"-"`
Deprecated_GUIEnabled bool `xml:"guiEnabled,omitempty" json:"-"`
Deprecated_GUIAddress string `xml:"guiAddress,omitempty" json:"-"`
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}
type GUIConfiguration struct {
Enabled bool `xml:"enabled,attr" json:"enabled" default:"true"`
Address string `xml:"address" json:"address" default:"127.0.0.1:8080"`
User string `xml:"user,omitempty" json:"user"`
Password string `xml:"password,omitempty" json:"password"`
UseTLS bool `xml:"tls,attr" json:"useTLS"`
APIKey string `xml:"apikey,omitempty" json:"apiKey"`
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}
func New(myID protocol.DeviceID) Configuration {
var cfg Configuration
cfg.Version = CurrentVersion
cfg.OriginalVersion = CurrentVersion
setDefaults(&cfg)
setDefaults(&cfg.Options)
setDefaults(&cfg.GUI)
cfg.prepare(myID)
return cfg
}
func ReadXML(r io.Reader, myID protocol.DeviceID) (Configuration, error) {
var cfg Configuration
setDefaults(&cfg)
setDefaults(&cfg.Options)
setDefaults(&cfg.GUI)
err := xml.NewDecoder(r).Decode(&cfg)
cfg.OriginalVersion = cfg.Version
cfg.prepare(myID)
return cfg, err
}
func (cfg *Configuration) WriteXML(w io.Writer) error {
e := xml.NewEncoder(w)
e.Indent("", " ")
err := e.Encode(cfg)
if err != nil {
return err
}
_, err = w.Write([]byte("\n"))
return err
}
func (cfg *Configuration) prepare(myID protocol.DeviceID) {
fillNilSlices(&cfg.Options)
// Initialize an empty slices
if cfg.Folders == nil {
cfg.Folders = []FolderConfiguration{}
}
if cfg.IgnoredDevices == nil {
cfg.IgnoredDevices = []protocol.DeviceID{}
}
// Check for missing, bad or duplicate folder ID:s
var seenFolders = map[string]*FolderConfiguration{}
var uniqueCounter int
for i := range cfg.Folders {
folder := &cfg.Folders[i]
if len(folder.Path) == 0 {
folder.Invalid = "no directory configured"
continue
}
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// The reason it's done like this:
// C: -> C:\ -> C:\ (issue that this is trying to fix)
// C:\somedir -> C:\somedir\ -> C:\somedir
// C:\somedir\ -> C:\somedir\\ -> C:\somedir
// This way in the tests, we get away without OS specific separators
// in the test configs.
folder.Path = filepath.Dir(folder.Path + string(filepath.Separator))
if folder.ID == "" {
folder.ID = "default"
}
if seen, ok := seenFolders[folder.ID]; ok {
l.Warnf("Multiple folders with ID %q; disabling", folder.ID)
seen.Invalid = "duplicate folder ID"
if seen.ID == folder.ID {
uniqueCounter++
seen.ID = fmt.Sprintf("%s~%d", folder.ID, uniqueCounter)
}
folder.Invalid = "duplicate folder ID"
uniqueCounter++
folder.ID = fmt.Sprintf("%s~%d", folder.ID, uniqueCounter)
} else {
seenFolders[folder.ID] = folder
}
}
if cfg.Options.Deprecated_URDeclined {
cfg.Options.URAccepted = -1
cfg.Options.URUniqueID = ""
}
cfg.Options.Deprecated_URDeclined = false
cfg.Options.Deprecated_UREnabled = false
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// Upgrade configuration versions as appropriate
if cfg.Version == 1 {
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convertV1V2(cfg)
}
if cfg.Version == 2 {
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convertV2V3(cfg)
}
if cfg.Version == 3 {
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convertV3V4(cfg)
}
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if cfg.Version == 4 {
convertV4V5(cfg)
}
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if cfg.Version == 5 {
convertV5V6(cfg)
}
if cfg.Version == 6 {
convertV6V7(cfg)
}
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if cfg.Version == 7 {
convertV7V8(cfg)
}
if cfg.Version == 8 {
convertV8V9(cfg)
}
// Hash old cleartext passwords
if len(cfg.GUI.Password) > 0 && cfg.GUI.Password[0] != '$' {
hash, err := bcrypt.GenerateFromPassword([]byte(cfg.GUI.Password), 0)
if err != nil {
l.Warnln("bcrypting password:", err)
} else {
cfg.GUI.Password = string(hash)
}
}
// Build a list of available devices
existingDevices := make(map[protocol.DeviceID]bool)
for _, device := range cfg.Devices {
existingDevices[device.DeviceID] = true
}
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// Ensure this device is present in the config
if !existingDevices[myID] {
myName, _ := os.Hostname()
cfg.Devices = append(cfg.Devices, DeviceConfiguration{
DeviceID: myID,
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Name: myName,
})
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existingDevices[myID] = true
}
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sort.Sort(DeviceConfigurationList(cfg.Devices))
// Ensure that any loose devices are not present in the wrong places
// Ensure that there are no duplicate devices
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// Ensure that puller settings are sane
for i := range cfg.Folders {
cfg.Folders[i].Devices = ensureDevicePresent(cfg.Folders[i].Devices, myID)
cfg.Folders[i].Devices = ensureExistingDevices(cfg.Folders[i].Devices, existingDevices)
cfg.Folders[i].Devices = ensureNoDuplicates(cfg.Folders[i].Devices)
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if cfg.Folders[i].Copiers == 0 {
cfg.Folders[i].Copiers = 1
}
if cfg.Folders[i].Pullers == 0 {
cfg.Folders[i].Pullers = 16
}
sort.Sort(FolderDeviceConfigurationList(cfg.Folders[i].Devices))
}
// An empty address list is equivalent to a single "dynamic" entry
for i := range cfg.Devices {
n := &cfg.Devices[i]
if len(n.Addresses) == 0 || len(n.Addresses) == 1 && n.Addresses[0] == "" {
n.Addresses = []string{"dynamic"}
}
}
cfg.Options.ListenAddress = uniqueStrings(cfg.Options.ListenAddress)
cfg.Options.GlobalAnnServers = uniqueStrings(cfg.Options.GlobalAnnServers)
if cfg.GUI.APIKey == "" {
cfg.GUI.APIKey = randomString(32)
}
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}
// ChangeRequiresRestart returns true if updating the configuration requires a
// complete restart.
func ChangeRequiresRestart(from, to Configuration) bool {
// Adding, removing or changing folders requires restart
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if !reflect.DeepEqual(from.Folders, to.Folders) {
return true
}
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// Removing a device requres restart
toDevs := make(map[protocol.DeviceID]bool, len(from.Devices))
for _, dev := range to.Devices {
toDevs[dev.DeviceID] = true
}
for _, dev := range from.Devices {
if _, ok := toDevs[dev.DeviceID]; !ok {
return true
}
}
// Changing usage reporting to on or off does not require a restart.
to.Options.URAccepted = from.Options.URAccepted
to.Options.URUniqueID = from.Options.URUniqueID
// All of the generic options require restart
if !reflect.DeepEqual(from.Options, to.Options) || !reflect.DeepEqual(from.GUI, to.GUI) {
return true
}
return false
}
func convertV8V9(cfg *Configuration) {
// Compression is interpreted and serialized differently, but no enforced
// changes. Still need a new version number since the compression stuff
// isn't understandable by earlier versions.
cfg.Version = 9
}
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func convertV7V8(cfg *Configuration) {
// Add IPv6 announce server
if len(cfg.Options.GlobalAnnServers) == 1 && cfg.Options.GlobalAnnServers[0] == "udp4://announce.syncthing.net:22026" {
cfg.Options.GlobalAnnServers = append(cfg.Options.GlobalAnnServers, "udp6://announce-v6.syncthing.net:22026")
}
cfg.Version = 8
}
func convertV6V7(cfg *Configuration) {
// Migrate announce server addresses to the new URL based format
for i := range cfg.Options.GlobalAnnServers {
cfg.Options.GlobalAnnServers[i] = "udp4://" + cfg.Options.GlobalAnnServers[i]
}
cfg.Version = 7
}
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func convertV5V6(cfg *Configuration) {
// Added ".stfolder" file at folder roots to identify mount issues
// Doesn't affect the config itself, but uses config migrations to identify
// the migration point.
for _, folder := range Wrap("", *cfg).Folders() {
// Best attempt, if it fails, it fails, the user will have to fix
// it up manually, as the repo will not get started.
folder.CreateMarker()
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}
cfg.Version = 6
}
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func convertV4V5(cfg *Configuration) {
// Renamed a bunch of fields in the structs.
if cfg.Deprecated_Nodes == nil {
cfg.Deprecated_Nodes = []DeviceConfiguration{}
}
if cfg.Deprecated_Repositories == nil {
cfg.Deprecated_Repositories = []FolderConfiguration{}
}
cfg.Devices = cfg.Deprecated_Nodes
cfg.Folders = cfg.Deprecated_Repositories
for i := range cfg.Folders {
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cfg.Folders[i].Path = cfg.Folders[i].Deprecated_Directory
cfg.Folders[i].Deprecated_Directory = ""
cfg.Folders[i].Devices = cfg.Folders[i].Deprecated_Nodes
cfg.Folders[i].Deprecated_Nodes = nil
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}
cfg.Deprecated_Nodes = nil
cfg.Deprecated_Repositories = nil
cfg.Version = 5
}
func convertV3V4(cfg *Configuration) {
// In previous versions, rescan interval was common for each folder.
// From now, it can be set independently. We have to make sure, that after upgrade
// the individual rescan interval will be defined for every existing folder.
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for i := range cfg.Deprecated_Repositories {
cfg.Deprecated_Repositories[i].RescanIntervalS = cfg.Options.Deprecated_RescanIntervalS
}
cfg.Options.Deprecated_RescanIntervalS = 0
// In previous versions, folders held full device configurations.
// Since that's the only place where device configs were in V1, we still have
// to define the deprecated fields to be able to upgrade from V1 to V4.
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for i, folder := range cfg.Deprecated_Repositories {
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for j := range folder.Deprecated_Nodes {
rncfg := cfg.Deprecated_Repositories[i].Deprecated_Nodes[j]
rncfg.Deprecated_Name = ""
rncfg.Deprecated_Addresses = nil
}
}
cfg.Version = 4
}
func convertV2V3(cfg *Configuration) {
// In previous versions, compression was always on. When upgrading, enable
// compression on all existing new. New devices will get compression on by
// default by the GUI.
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for i := range cfg.Deprecated_Nodes {
cfg.Deprecated_Nodes[i].Compression = protocol.CompressMetadata
}
// The global discovery format and port number changed in v0.9. Having the
// default announce server but old port number is guaranteed to be legacy.
if len(cfg.Options.GlobalAnnServers) == 1 && cfg.Options.GlobalAnnServers[0] == "announce.syncthing.net:22025" {
cfg.Options.GlobalAnnServers = []string{"announce.syncthing.net:22026"}
}
cfg.Version = 3
}
func convertV1V2(cfg *Configuration) {
// Collect the list of devices.
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// Replace device configs inside folders with only a reference to the
// device ID. Set all folders to read only if the global read only flag is
// set.
var devices = map[string]FolderDeviceConfiguration{}
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for i, folder := range cfg.Deprecated_Repositories {
cfg.Deprecated_Repositories[i].ReadOnly = cfg.Options.Deprecated_ReadOnly
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for j, device := range folder.Deprecated_Nodes {
id := device.DeviceID.String()
if _, ok := devices[id]; !ok {
devices[id] = device
}
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cfg.Deprecated_Repositories[i].Deprecated_Nodes[j] = FolderDeviceConfiguration{DeviceID: device.DeviceID}
}
}
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cfg.Options.Deprecated_ReadOnly = false
// Set and sort the list of devices.
for _, device := range devices {
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cfg.Deprecated_Nodes = append(cfg.Deprecated_Nodes, DeviceConfiguration{
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DeviceID: device.DeviceID,
Name: device.Deprecated_Name,
Addresses: device.Deprecated_Addresses,
})
}
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sort.Sort(DeviceConfigurationList(cfg.Deprecated_Nodes))
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// GUI
cfg.GUI.Address = cfg.Options.Deprecated_GUIAddress
cfg.GUI.Enabled = cfg.Options.Deprecated_GUIEnabled
cfg.Options.Deprecated_GUIEnabled = false
cfg.Options.Deprecated_GUIAddress = ""
cfg.Version = 2
}
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func setDefaults(data interface{}) error {
s := reflect.ValueOf(data).Elem()
t := s.Type()
for i := 0; i < s.NumField(); i++ {
f := s.Field(i)
tag := t.Field(i).Tag
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v := tag.Get("default")
if len(v) > 0 {
switch f.Interface().(type) {
case string:
f.SetString(v)
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case int:
i, err := strconv.ParseInt(v, 10, 64)
if err != nil {
return err
}
f.SetInt(i)
case bool:
f.SetBool(v == "true")
case []string:
// We don't do anything with string slices here. Any default
// we set will be appended to by the XML decoder, so we fill
// those after decoding.
default:
panic(f.Type())
}
}
}
return nil
}
// fillNilSlices sets default value on slices that are still nil.
func fillNilSlices(data interface{}) error {
s := reflect.ValueOf(data).Elem()
t := s.Type()
for i := 0; i < s.NumField(); i++ {
f := s.Field(i)
tag := t.Field(i).Tag
v := tag.Get("default")
if len(v) > 0 {
switch f.Interface().(type) {
case []string:
if f.IsNil() {
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// Treat the default as a comma separated slice
vs := strings.Split(v, ",")
for i := range vs {
vs[i] = strings.TrimSpace(vs[i])
}
rv := reflect.MakeSlice(reflect.TypeOf([]string{}), len(vs), len(vs))
for i, v := range vs {
rv.Index(i).SetString(v)
}
f.Set(rv)
}
}
}
}
return nil
}
func uniqueStrings(ss []string) []string {
var m = make(map[string]bool, len(ss))
for _, s := range ss {
m[s] = true
}
var us = make([]string, 0, len(m))
for k := range m {
us = append(us, k)
}
sort.Strings(us)
return us
}
func ensureDevicePresent(devices []FolderDeviceConfiguration, myID protocol.DeviceID) []FolderDeviceConfiguration {
for _, device := range devices {
if device.DeviceID.Equals(myID) {
return devices
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}
}
devices = append(devices, FolderDeviceConfiguration{
DeviceID: myID,
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})
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return devices
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}
func ensureExistingDevices(devices []FolderDeviceConfiguration, existingDevices map[protocol.DeviceID]bool) []FolderDeviceConfiguration {
count := len(devices)
i := 0
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loop:
for i < count {
if _, ok := existingDevices[devices[i].DeviceID]; !ok {
devices[i] = devices[count-1]
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count--
continue loop
}
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i++
}
return devices[0:count]
}
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func ensureNoDuplicates(devices []FolderDeviceConfiguration) []FolderDeviceConfiguration {
count := len(devices)
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i := 0
seenDevices := make(map[protocol.DeviceID]bool)
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loop:
for i < count {
id := devices[i].DeviceID
if _, ok := seenDevices[id]; ok {
devices[i] = devices[count-1]
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count--
continue loop
}
seenDevices[id] = true
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i++
}
return devices[0:count]
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}
type DeviceConfigurationList []DeviceConfiguration
func (l DeviceConfigurationList) Less(a, b int) bool {
return l[a].DeviceID.Compare(l[b].DeviceID) == -1
}
func (l DeviceConfigurationList) Swap(a, b int) {
l[a], l[b] = l[b], l[a]
}
func (l DeviceConfigurationList) Len() int {
return len(l)
}
type FolderDeviceConfigurationList []FolderDeviceConfiguration
func (l FolderDeviceConfigurationList) Less(a, b int) bool {
return l[a].DeviceID.Compare(l[b].DeviceID) == -1
}
func (l FolderDeviceConfigurationList) Swap(a, b int) {
l[a], l[b] = l[b], l[a]
}
func (l FolderDeviceConfigurationList) Len() int {
return len(l)
}
// randomCharset contains the characters that can make up a randomString().
const randomCharset = "01234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-"
// randomString returns a string of random characters (taken from
// randomCharset) of the specified length.
func randomString(l int) string {
bs := make([]byte, l)
for i := range bs {
bs[i] = randomCharset[rand.Intn(len(randomCharset))]
}
return string(bs)
}