forked from syncthing/syncthing
/
main.go
1314 lines (1125 loc) · 35.3 KB
/
main.go
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"crypto/tls"
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
_ "net/http/pprof"
"net/url"
"os"
"path/filepath"
"regexp"
"runtime"
"runtime/debug"
"runtime/pprof"
"strconv"
"strings"
"time"
"github.com/calmh/logger"
"github.com/juju/ratelimit"
"github.com/syncthing/protocol"
"github.com/syncthing/syncthing/internal/config"
"github.com/syncthing/syncthing/internal/db"
"github.com/syncthing/syncthing/internal/discover"
"github.com/syncthing/syncthing/internal/events"
"github.com/syncthing/syncthing/internal/model"
"github.com/syncthing/syncthing/internal/osutil"
"github.com/syncthing/syncthing/internal/symlinks"
"github.com/syncthing/syncthing/internal/upgrade"
"github.com/syncthing/syncthing/internal/upnp"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/opt"
"golang.org/x/crypto/bcrypt"
)
var (
Version = "unknown-dev"
BuildEnv = "default"
BuildStamp = "0"
BuildDate time.Time
BuildHost = "unknown"
BuildUser = "unknown"
IsRelease bool
IsBeta bool
LongVersion string
)
const (
exitSuccess = 0
exitError = 1
exitNoUpgradeAvailable = 2
exitRestarting = 3
exitUpgrading = 4
)
var l = logger.DefaultLogger
func init() {
if Version != "unknown-dev" {
// If not a generic dev build, version string should come from git describe
exp := regexp.MustCompile(`^v\d+\.\d+\.\d+(-[a-z0-9]+)*(\+\d+-g[0-9a-f]+)?(-dirty)?$`)
if !exp.MatchString(Version) {
l.Fatalf("Invalid version string %q;\n\tdoes not match regexp %v", Version, exp)
}
}
// Check for a clean release build.
exp := regexp.MustCompile(`^v\d+\.\d+\.\d+(-beta[\d\.]+)?$`)
IsRelease = exp.MatchString(Version)
// Check for a beta build
IsBeta = strings.Contains(Version, "-beta")
stamp, _ := strconv.Atoi(BuildStamp)
BuildDate = time.Unix(int64(stamp), 0)
date := BuildDate.UTC().Format("2006-01-02 15:04:05 MST")
LongVersion = fmt.Sprintf("syncthing %s (%s %s-%s %s) %s@%s %s", Version, runtime.Version(), runtime.GOOS, runtime.GOARCH, BuildEnv, BuildUser, BuildHost, date)
if os.Getenv("STTRACE") != "" {
logFlags = log.Ltime | log.Ldate | log.Lmicroseconds | log.Lshortfile
}
}
var (
cfg *config.Wrapper
myID protocol.DeviceID
confDir string
logFlags = log.Ltime
writeRateLimit *ratelimit.Bucket
readRateLimit *ratelimit.Bucket
stop = make(chan int)
discoverer *discover.Discoverer
externalPort int
igd *upnp.IGD
cert tls.Certificate
)
const (
usage = "syncthing [options]"
extraUsage = `
The default configuration directory is:
%s
The -logflags value is a sum of the following:
1 Date
2 Time
4 Microsecond time
8 Long filename
16 Short filename
I.e. to prefix each log line with date and time, set -logflags=3 (1 + 2 from
above). The value 0 is used to disable all of the above. The default is to
show time only (2).
Development Settings
--------------------
The following environment variables modify syncthing's behavior in ways that
are mostly useful for developers. Use with care.
STGUIASSETS Directory to load GUI assets from. Overrides compiled in assets.
STTRACE A comma separated string of facilities to trace. The valid
facility strings are:
- "beacon" (the beacon package)
- "discover" (the discover package)
- "events" (the events package)
- "files" (the files package)
- "net" (the main package; connections & network messages)
- "model" (the model package)
- "scanner" (the scanner package)
- "stats" (the stats package)
- "upnp" (the upnp package)
- "xdr" (the xdr package)
- "all" (all of the above)
STPROFILER Set to a listen address such as "127.0.0.1:9090" to start the
profiler with HTTP access.
STCPUPROFILE Write a CPU profile to cpu-$pid.pprof on exit.
STHEAPPROFILE Write heap profiles to heap-$pid-$timestamp.pprof each time
heap usage increases.
STBLOCKPROFILE Write block profiles to block-$pid-$timestamp.pprof every 20
seconds.
STPERFSTATS Write running performance statistics to perf-$pid.csv. Not
supported on Windows.
STNOUPGRADE Disable automatic upgrades.
GOMAXPROCS Set the maximum number of CPU cores to use. Defaults to all
available CPU cores.`
)
// Command line and environment options
var (
reset bool
showVersion bool
doUpgrade bool
doUpgradeCheck bool
upgradeTo string
noBrowser bool
noConsole bool
generateDir string
logFile string
noRestart = os.Getenv("STNORESTART") != ""
noUpgrade = os.Getenv("STNOUPGRADE") != ""
guiAddress = os.Getenv("STGUIADDRESS") // legacy
guiAuthentication = os.Getenv("STGUIAUTH") // legacy
guiAPIKey = os.Getenv("STGUIAPIKEY") // legacy
profiler = os.Getenv("STPROFILER")
guiAssets = os.Getenv("STGUIASSETS")
cpuProfile = os.Getenv("STCPUPROFILE") != ""
stRestarting = os.Getenv("STRESTART") != ""
innerProcess = os.Getenv("STNORESTART") != "" || os.Getenv("STMONITORED") != ""
)
func main() {
defConfDir, err := getDefaultConfDir()
if err != nil {
l.Fatalln("home:", err)
}
if runtime.GOOS == "windows" {
// On Windows, we use a log file by default. Setting the -logfile flag
// to the empty string disables this behavior.
logFile = filepath.Join(defConfDir, "syncthing.log")
flag.StringVar(&logFile, "logfile", logFile, "Log file name (blank for stdout)")
// We also add an option to hide the console window
flag.BoolVar(&noConsole, "no-console", false, "Hide console window")
}
flag.StringVar(&generateDir, "generate", "", "Generate key and config in specified dir, then exit")
flag.StringVar(&guiAddress, "gui-address", guiAddress, "Override GUI address")
flag.StringVar(&guiAuthentication, "gui-authentication", guiAuthentication, "Override GUI authentication; username:password")
flag.StringVar(&guiAPIKey, "gui-apikey", guiAPIKey, "Override GUI API key")
flag.StringVar(&confDir, "home", "", "Set configuration directory")
flag.IntVar(&logFlags, "logflags", logFlags, "Select information in log line prefix")
flag.BoolVar(&noBrowser, "no-browser", false, "Do not start browser")
flag.BoolVar(&noRestart, "no-restart", noRestart, "Do not restart; just exit")
flag.BoolVar(&reset, "reset", false, "Prepare to resync from cluster")
flag.BoolVar(&doUpgrade, "upgrade", false, "Perform upgrade")
flag.BoolVar(&doUpgradeCheck, "upgrade-check", false, "Check for available upgrade")
flag.BoolVar(&showVersion, "version", false, "Show version")
flag.StringVar(&upgradeTo, "upgrade-to", upgradeTo, "Force upgrade directly from specified URL")
flag.Usage = usageFor(flag.CommandLine, usage, fmt.Sprintf(extraUsage, defConfDir))
flag.Parse()
if noConsole {
osutil.HideConsole()
}
if confDir == "" {
// Not set as default above because the string can be really long.
confDir = defConfDir
}
if confDir != defConfDir && filepath.Dir(logFile) == defConfDir {
// The user changed the config dir with -home, but not the log file
// location. In this case we assume they meant for the logfile to
// still live in it's default location *relative to the config dir*.
logFile = filepath.Join(confDir, "syncthing.log")
}
if showVersion {
fmt.Println(LongVersion)
return
}
l.SetFlags(logFlags)
if generateDir != "" {
dir, err := osutil.ExpandTilde(generateDir)
if err != nil {
l.Fatalln("generate:", err)
}
info, err := os.Stat(dir)
if err == nil && !info.IsDir() {
l.Fatalln(dir, "is not a directory")
}
if err != nil && os.IsNotExist(err) {
err = os.MkdirAll(dir, 0700)
if err != nil {
l.Fatalln("generate:", err)
}
}
cert, err := loadCert(dir, "")
if err == nil {
l.Warnln("Key exists; will not overwrite.")
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
} else {
newCertificate(dir, "", tlsDefaultCommonName)
cert, err = loadCert(dir, "")
myID = protocol.NewDeviceID(cert.Certificate[0])
if err != nil {
l.Fatalln("load cert:", err)
}
if err == nil {
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
}
}
cfgFile := filepath.Join(dir, "config.xml")
if _, err := os.Stat(cfgFile); err == nil {
l.Warnln("Config exists; will not overwrite.")
return
}
var myName, _ = os.Hostname()
var newCfg = defaultConfig(myName)
var cfg = config.Wrap(cfgFile, newCfg)
err = cfg.Save()
if err != nil {
l.Warnln("Failed to save config", err)
}
return
}
confDir, err := osutil.ExpandTilde(confDir)
if err != nil {
l.Fatalln("home:", err)
}
if info, err := os.Stat(confDir); err == nil && !info.IsDir() {
l.Fatalln("Config directory", confDir, "is not a directory")
}
// Ensure that our home directory exists.
ensureDir(confDir, 0700)
if upgradeTo != "" {
err := upgrade.ToURL(upgradeTo)
if err != nil {
l.Fatalln("Upgrade:", err) // exits 1
}
l.Okln("Upgraded from", upgradeTo)
return
}
if doUpgrade || doUpgradeCheck {
rel, err := upgrade.LatestRelease(IsBeta)
if err != nil {
l.Fatalln("Upgrade:", err) // exits 1
}
if upgrade.CompareVersions(rel.Tag, Version) <= 0 {
l.Infof("No upgrade available (current %q >= latest %q).", Version, rel.Tag)
os.Exit(exitNoUpgradeAvailable)
}
l.Infof("Upgrade available (current %q < latest %q)", Version, rel.Tag)
if doUpgrade {
// Use leveldb database locks to protect against concurrent upgrades
_, err = leveldb.OpenFile(filepath.Join(confDir, "index"), &opt.Options{OpenFilesCacheCapacity: 100})
if err != nil {
l.Fatalln("Cannot upgrade, database seems to be locked. Is another copy of Syncthing already running?")
}
err = upgrade.To(rel)
if err != nil {
l.Fatalln("Upgrade:", err) // exits 1
}
l.Okf("Upgraded to %q", rel.Tag)
}
return
}
if reset {
resetFolders()
return
}
if noRestart {
syncthingMain()
} else {
monitorMain()
}
}
func syncthingMain() {
var err error
if len(os.Getenv("GOGC")) == 0 {
debug.SetGCPercent(25)
}
if len(os.Getenv("GOMAXPROCS")) == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
}
events.Default.Log(events.Starting, map[string]string{"home": confDir})
// Ensure that that we have a certificate and key.
cert, err = loadCert(confDir, "")
if err != nil {
newCertificate(confDir, "", tlsDefaultCommonName)
cert, err = loadCert(confDir, "")
if err != nil {
l.Fatalln("load cert:", err)
}
}
// We reinitialize the predictable RNG with our device ID, to get a
// sequence that is always the same but unique to this syncthing instance.
predictableRandom.Seed(seedFromBytes(cert.Certificate[0]))
myID = protocol.NewDeviceID(cert.Certificate[0])
l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))
l.Infoln(LongVersion)
l.Infoln("My ID:", myID)
// Prepare to be able to save configuration
cfgFile := filepath.Join(confDir, "config.xml")
var myName string
// Load the configuration file, if it exists.
// If it does not, create a template.
if info, err := os.Stat(cfgFile); err == nil {
if !info.Mode().IsRegular() {
l.Fatalln("Config file is not a file?")
}
cfg, err = config.Load(cfgFile, myID)
if err == nil {
myCfg := cfg.Devices()[myID]
if myCfg.Name == "" {
myName, _ = os.Hostname()
} else {
myName = myCfg.Name
}
} else {
l.Fatalln("Configuration:", err)
}
} else {
l.Infoln("No config file; starting with empty defaults")
myName, _ = os.Hostname()
newCfg := defaultConfig(myName)
cfg = config.Wrap(cfgFile, newCfg)
cfg.Save()
l.Infof("Edit %s to taste or use the GUI\n", cfgFile)
}
if cfg.Raw().OriginalVersion != config.CurrentVersion {
l.Infoln("Archiving a copy of old config file format")
// Archive a copy
osutil.Rename(cfgFile, cfgFile+fmt.Sprintf(".v%d", cfg.Raw().OriginalVersion))
// Save the new version
cfg.Save()
}
if len(profiler) > 0 {
go func() {
l.Debugln("Starting profiler on", profiler)
runtime.SetBlockProfileRate(1)
err := http.ListenAndServe(profiler, nil)
if err != nil {
l.Fatalln(err)
}
}()
}
// The TLS configuration is used for both the listening socket and outgoing
// connections.
tlsCfg := &tls.Config{
Certificates: []tls.Certificate{cert},
NextProtos: []string{"bep/1.0"},
ClientAuth: tls.RequestClientCert,
SessionTicketsDisabled: true,
InsecureSkipVerify: true,
MinVersion: tls.VersionTLS12,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
},
}
// If the read or write rate should be limited, set up a rate limiter for it.
// This will be used on connections created in the connect and listen routines.
opts := cfg.Options()
if !opts.SymlinksEnabled {
symlinks.Supported = false
}
if opts.MaxSendKbps > 0 {
writeRateLimit = ratelimit.NewBucketWithRate(float64(1000*opts.MaxSendKbps), int64(5*1000*opts.MaxSendKbps))
}
if opts.MaxRecvKbps > 0 {
readRateLimit = ratelimit.NewBucketWithRate(float64(1000*opts.MaxRecvKbps), int64(5*1000*opts.MaxRecvKbps))
}
ldb, err := leveldb.OpenFile(filepath.Join(confDir, "index"), &opt.Options{OpenFilesCacheCapacity: 100})
if err != nil {
l.Fatalln("Cannot open database:", err, "- Is another copy of Syncthing already running?")
}
// Remove database entries for folders that no longer exist in the config
folders := cfg.Folders()
for _, folder := range db.ListFolders(ldb) {
if _, ok := folders[folder]; !ok {
l.Infof("Cleaning data for dropped folder %q", folder)
db.DropFolder(ldb, folder)
}
}
m := model.NewModel(cfg, myName, "syncthing", Version, ldb)
sanityCheckFolders(cfg, m)
// GUI
setupGUI(cfg, m)
// Clear out old indexes for other devices. Otherwise we'll start up and
// start needing a bunch of files which are nowhere to be found. This
// needs to be changed when we correctly do persistent indexes.
for _, folderCfg := range cfg.Folders() {
if folderCfg.Invalid != "" {
continue
}
for _, device := range folderCfg.DeviceIDs() {
if device == myID {
continue
}
m.Index(device, folderCfg.ID, nil)
}
}
// The default port we announce, possibly modified by setupUPnP next.
addr, err := net.ResolveTCPAddr("tcp", opts.ListenAddress[0])
if err != nil {
l.Fatalln("Bad listen address:", err)
}
externalPort = addr.Port
// UPnP
igd = nil
if opts.UPnPEnabled {
setupUPnP()
}
// Routine to connect out to configured devices
discoverer = discovery(externalPort)
go listenConnect(myID, m, tlsCfg)
for _, folder := range cfg.Folders() {
if folder.Invalid != "" {
continue
}
// Routine to pull blocks from other devices to synchronize the local
// folder. Does not run when we are in read only (publish only) mode.
if folder.ReadOnly {
l.Okf("Ready to synchronize %s (read only; no external updates accepted)", folder.ID)
m.StartFolderRO(folder.ID)
} else {
l.Okf("Ready to synchronize %s (read-write)", folder.ID)
m.StartFolderRW(folder.ID)
}
}
if cpuProfile {
f, err := os.Create(fmt.Sprintf("cpu-%d.pprof", os.Getpid()))
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
for _, device := range cfg.Devices() {
if len(device.Name) > 0 {
l.Infof("Device %s is %q at %v", device.DeviceID, device.Name, device.Addresses)
}
}
if opts.URAccepted > 0 && opts.URAccepted < usageReportVersion {
l.Infoln("Anonymous usage report has changed; revoking acceptance")
opts.URAccepted = 0
opts.URUniqueID = ""
cfg.SetOptions(opts)
}
if opts.URAccepted >= usageReportVersion {
if opts.URUniqueID == "" {
// Previously the ID was generated from the node ID. We now need
// to generate a new one.
opts.URUniqueID = randomString(8)
cfg.SetOptions(opts)
cfg.Save()
}
go usageReportingLoop(m)
go func() {
time.Sleep(10 * time.Minute)
err := sendUsageReport(m)
if err != nil {
l.Infoln("Usage report:", err)
}
}()
}
if opts.RestartOnWakeup {
go standbyMonitor()
}
if opts.AutoUpgradeIntervalH > 0 {
if noUpgrade {
l.Infof("No automatic upgrades; STNOUPGRADE environment variable defined.")
} else if IsRelease {
go autoUpgrade()
} else {
l.Infof("No automatic upgrades; %s is not a relase version.", Version)
}
}
events.Default.Log(events.StartupComplete, nil)
go generateEvents()
code := <-stop
l.Okln("Exiting")
os.Exit(code)
}
func setupGUI(cfg *config.Wrapper, m *model.Model) {
opts := cfg.Options()
guiCfg := overrideGUIConfig(cfg.GUI(), guiAddress, guiAuthentication, guiAPIKey)
if guiCfg.Enabled && guiCfg.Address != "" {
addr, err := net.ResolveTCPAddr("tcp", guiCfg.Address)
if err != nil {
l.Fatalf("Cannot start GUI on %q: %v", guiCfg.Address, err)
} else {
var hostOpen, hostShow string
switch {
case addr.IP == nil:
hostOpen = "localhost"
hostShow = "0.0.0.0"
case addr.IP.IsUnspecified():
hostOpen = "localhost"
hostShow = addr.IP.String()
default:
hostOpen = addr.IP.String()
hostShow = hostOpen
}
var proto = "http"
if guiCfg.UseTLS {
proto = "https"
}
urlShow := fmt.Sprintf("%s://%s/", proto, net.JoinHostPort(hostShow, strconv.Itoa(addr.Port)))
l.Infoln("Starting web GUI on", urlShow)
err := startGUI(guiCfg, guiAssets, m)
if err != nil {
l.Fatalln("Cannot start GUI:", err)
}
if opts.StartBrowser && !noBrowser && !stRestarting {
urlOpen := fmt.Sprintf("%s://%s/", proto, net.JoinHostPort(hostOpen, strconv.Itoa(addr.Port)))
// Can potentially block if the utility we are invoking doesn't
// fork, and just execs, hence keep it in it's own routine.
go openURL(urlOpen)
}
}
}
}
func sanityCheckFolders(cfg *config.Wrapper, m *model.Model) {
nextFolder:
for id, folder := range cfg.Folders() {
if folder.Invalid != "" {
continue
}
m.AddFolder(folder)
fi, err := os.Stat(folder.Path)
if m.CurrentLocalVersion(id) > 0 {
// Safety check. If the cached index contains files but the
// folder doesn't exist, we have a problem. We would assume
// that all files have been deleted which might not be the case,
// so mark it as invalid instead.
if err != nil || !fi.IsDir() {
l.Warnf("Stopping folder %q - path does not exist, but has files in index", folder.ID)
cfg.InvalidateFolder(id, "folder path missing")
continue nextFolder
} else if !folder.HasMarker() {
l.Warnf("Stopping folder %q - path exists, but folder marker missing, check for mount issues", folder.ID)
cfg.InvalidateFolder(id, "folder marker missing")
continue nextFolder
}
} else if os.IsNotExist(err) {
// If we don't have any files in the index, and the directory
// doesn't exist, try creating it.
err = os.MkdirAll(folder.Path, 0700)
if err != nil {
l.Warnf("Stopping folder %q - %v", folder.ID, err)
cfg.InvalidateFolder(id, err.Error())
continue nextFolder
}
err = folder.CreateMarker()
} else if !folder.HasMarker() {
// If we don't have any files in the index, and the path does exist
// but the marker is not there, create it.
err = folder.CreateMarker()
}
if err != nil {
// If there was another error or we could not create the
// path, the folder is invalid.
l.Warnf("Stopping folder %q - %v", folder.ID, err)
cfg.InvalidateFolder(id, err.Error())
continue nextFolder
}
}
}
func defaultConfig(myName string) config.Configuration {
defaultFolder, err := osutil.ExpandTilde("~/Sync")
if err != nil {
l.Fatalln("home:", err)
}
newCfg := config.New(myID)
newCfg.Folders = []config.FolderConfiguration{
{
ID: "default",
Path: defaultFolder,
RescanIntervalS: 60,
Devices: []config.FolderDeviceConfiguration{{DeviceID: myID}},
},
}
newCfg.Devices = []config.DeviceConfiguration{
{
DeviceID: myID,
Addresses: []string{"dynamic"},
Name: myName,
},
}
port, err := getFreePort("127.0.0.1", 8080)
if err != nil {
l.Fatalln("get free port (GUI):", err)
}
newCfg.GUI.Address = fmt.Sprintf("127.0.0.1:%d", port)
port, err = getFreePort("0.0.0.0", 22000)
if err != nil {
l.Fatalln("get free port (BEP):", err)
}
newCfg.Options.ListenAddress = []string{fmt.Sprintf("0.0.0.0:%d", port)}
return newCfg
}
func generateEvents() {
for {
time.Sleep(300 * time.Second)
events.Default.Log(events.Ping, nil)
}
}
func setupUPnP() {
if opts := cfg.Options(); len(opts.ListenAddress) == 1 {
_, portStr, err := net.SplitHostPort(opts.ListenAddress[0])
if err != nil {
l.Warnln("Bad listen address:", err)
} else {
// Set up incoming port forwarding, if necessary and possible
port, _ := strconv.Atoi(portStr)
igds := upnp.Discover()
if len(igds) > 0 {
// Configure the first discovered IGD only. This is a work-around until we have a better mechanism
// for handling multiple IGDs, which will require changes to the global discovery service
igd = &igds[0]
externalPort = setupExternalPort(igd, port)
if externalPort == 0 {
l.Warnln("Failed to create UPnP port mapping")
} else {
l.Infof("Created UPnP port mapping for external port %d on UPnP device %s.", externalPort, igd.FriendlyIdentifier())
if opts.UPnPRenewal > 0 {
go renewUPnP(port)
}
}
}
}
} else {
l.Warnln("Multiple listening addresses; not attempting UPnP port mapping")
}
}
func setupExternalPort(igd *upnp.IGD, port int) int {
if igd == nil {
return 0
}
for i := 0; i < 10; i++ {
r := 1024 + predictableRandom.Intn(65535-1024)
err := igd.AddPortMapping(upnp.TCP, r, port, fmt.Sprintf("syncthing-%d", r), cfg.Options().UPnPLease*60)
if err == nil {
return r
}
}
return 0
}
func renewUPnP(port int) {
for {
opts := cfg.Options()
time.Sleep(time.Duration(opts.UPnPRenewal) * time.Minute)
// Make sure our IGD reference isn't nil
if igd == nil {
if debugNet {
l.Debugln("Undefined IGD during UPnP port renewal. Re-discovering...")
}
igds := upnp.Discover()
if len(igds) > 0 {
// Configure the first discovered IGD only. This is a work-around until we have a better mechanism
// for handling multiple IGDs, which will require changes to the global discovery service
igd = &igds[0]
} else {
if debugNet {
l.Debugln("Failed to discover IGD during UPnP port mapping renewal.")
}
continue
}
}
// Just renew the same port that we already have
if externalPort != 0 {
err := igd.AddPortMapping(upnp.TCP, externalPort, port, "syncthing", opts.UPnPLease*60)
if err != nil {
l.Warnf("Error renewing UPnP port mapping for external port %d on device %s: %s", externalPort, igd.FriendlyIdentifier(), err.Error())
} else if debugNet {
l.Debugf("Renewed UPnP port mapping for external port %d on device %s.", externalPort, igd.FriendlyIdentifier())
}
continue
}
// Something strange has happened. We didn't have an external port before?
// Or perhaps the gateway has changed?
// Retry the same port sequence from the beginning.
if debugNet {
l.Debugln("No UPnP port mapping defined, updating...")
}
forwardedPort := setupExternalPort(igd, port)
if forwardedPort != 0 {
externalPort = forwardedPort
discoverer.StopGlobal()
discoverer.StartGlobal(opts.GlobalAnnServers, uint16(forwardedPort))
if debugNet {
l.Debugf("Updated UPnP port mapping for external port %d on device %s.", forwardedPort, igd.FriendlyIdentifier())
}
} else {
l.Warnf("Failed to update UPnP port mapping for external port on device " + igd.FriendlyIdentifier() + ".")
}
}
}
func resetFolders() {
confDir, err := osutil.ExpandTilde(confDir)
if err != nil {
log.Fatal(err)
}
cfgFile := filepath.Join(confDir, "config.xml")
cfg, err := config.Load(cfgFile, myID)
if err != nil {
log.Fatal(err)
}
suffix := fmt.Sprintf(".syncthing-reset-%d", time.Now().UnixNano())
for _, folder := range cfg.Folders() {
if _, err := os.Stat(folder.Path); err == nil {
base := filepath.Base(folder.Path)
dir := filepath.Dir(filepath.Join(folder.Path, ".."))
l.Infof("Reset: Moving %s -> %s", folder.Path, filepath.Join(dir, base+suffix))
os.Rename(folder.Path, filepath.Join(dir, base+suffix))
}
}
idx := filepath.Join(confDir, "index")
os.RemoveAll(idx)
}
func restart() {
l.Infoln("Restarting")
stop <- exitRestarting
}
func shutdown() {
l.Infoln("Shutting down")
stop <- exitSuccess
}
func listenConnect(myID protocol.DeviceID, m *model.Model, tlsCfg *tls.Config) {
var conns = make(chan *tls.Conn)
// Listen
for _, addr := range cfg.Options().ListenAddress {
go listenTLS(conns, addr, tlsCfg)
}
// Connect
go dialTLS(m, conns, tlsCfg)
next:
for conn := range conns {
certs := conn.ConnectionState().PeerCertificates
if cl := len(certs); cl != 1 {
l.Infof("Got peer certificate list of length %d != 1 from %s; protocol error", cl, conn.RemoteAddr())
conn.Close()
continue
}
remoteCert := certs[0]
remoteID := protocol.NewDeviceID(remoteCert.Raw)
if remoteID == myID {
l.Infof("Connected to myself (%s) - should not happen", remoteID)
conn.Close()
continue
}
if m.ConnectedTo(remoteID) {
l.Infof("Connected to already connected device (%s)", remoteID)
conn.Close()
continue
}
for deviceID, deviceCfg := range cfg.Devices() {
if deviceID == remoteID {
// Verify the name on the certificate. By default we set it to
// "syncthing" when generating, but the user may have replaced
// the certificate and used another name.
certName := deviceCfg.CertName
if certName == "" {
certName = tlsDefaultCommonName
}
err := remoteCert.VerifyHostname(certName)
if err != nil {
// Incorrect certificate name is something the user most
// likely wants to know about, since it's an advanced
// config. Warn instead of Info.
l.Warnf("Bad certificate from %s (%v): %v", remoteID, conn.RemoteAddr(), err)
conn.Close()
continue next
}
// If rate limiting is set, we wrap the connection in a
// limiter.
wr := io.Writer(conn)
if writeRateLimit != nil {
wr = &limitedWriter{conn, writeRateLimit}
}
rd := io.Reader(conn)
if readRateLimit != nil {
rd = &limitedReader{conn, readRateLimit}
}
name := fmt.Sprintf("%s-%s", conn.LocalAddr(), conn.RemoteAddr())
protoConn := protocol.NewConnection(remoteID, rd, wr, m, name, deviceCfg.Compression)
l.Infof("Established secure connection to %s at %s", remoteID, name)
if debugNet {
l.Debugf("cipher suite %04X", conn.ConnectionState().CipherSuite)
}
events.Default.Log(events.DeviceConnected, map[string]string{
"id": remoteID.String(),
"addr": conn.RemoteAddr().String(),
})
m.AddConnection(conn, protoConn)
continue next
}
}
if !cfg.IgnoredDevice(remoteID) {
events.Default.Log(events.DeviceRejected, map[string]string{
"device": remoteID.String(),
"address": conn.RemoteAddr().String(),
})
l.Infof("Connection from %s with unknown device ID %s", conn.RemoteAddr(), remoteID)
} else {
l.Infof("Connection from %s with ignored device ID %s", conn.RemoteAddr(), remoteID)
}
conn.Close()
}
}
func listenTLS(conns chan *tls.Conn, addr string, tlsCfg *tls.Config) {
if debugNet {