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main.go
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main.go
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package main
import (
"crypto/tls"
"flag"
"fmt"
"io"
"log"
"math/rand"
"net"
"net/http"
_ "net/http/pprof"
"os"
"os/exec"
"path/filepath"
"runtime"
"runtime/debug"
"runtime/pprof"
"strconv"
"strings"
"time"
"github.com/calmh/syncthing/config"
"github.com/calmh/syncthing/discover"
"github.com/calmh/syncthing/logger"
"github.com/calmh/syncthing/model"
"github.com/calmh/syncthing/osutil"
"github.com/calmh/syncthing/protocol"
"github.com/calmh/syncthing/upnp"
"github.com/juju/ratelimit"
)
var (
Version = "unknown-dev"
BuildStamp = "0"
BuildDate time.Time
BuildHost = "unknown"
BuildUser = "unknown"
LongVersion string
)
var l = logger.DefaultLogger
func init() {
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", Version, runtime.Version(), runtime.GOOS, runtime.GOARCH, BuildUser, BuildHost, date)
if os.Getenv("STTRACE") != "" {
l.SetFlags(log.Ltime | log.Ldate | log.Lmicroseconds | log.Lshortfile)
}
}
var (
cfg config.Configuration
myID string
confDir string
rateBucket *ratelimit.Bucket
stop = make(chan bool)
discoverer *discover.Discoverer
)
const (
usage = "syncthing [options]"
extraUsage = `The following enviroment variables are interpreted by syncthing:
STNORESTART Do not attempt to restart when requested to, instead just exit.
Set this variable when running under a service manager such as
runit, launchd, etc.
STPROFILER Set to a listen address such as "127.0.0.1:9090" to start the
profiler with HTTP access.
STTRACE A comma separated string of facilities to trace. The valid
facility strings:
- "beacon" (the beacon package)
- "discover" (the discover package)
- "files" (the files package)
- "net" (the main package; connections & network messages)
- "model" (the model package)
- "scanner" (the scanner package)
- "upnp" (the upnp package)
- "xdr" (the xdr package)
- "all" (all of the above)
STCPUPROFILE Write CPU profile to the specified file.
STGUIASSETS Directory to load GUI assets from. Overrides compiled in assets.`
)
func main() {
var reset bool
var showVersion bool
var doUpgrade bool
flag.StringVar(&confDir, "home", getDefaultConfDir(), "Set configuration directory")
flag.BoolVar(&reset, "reset", false, "Prepare to resync from cluster")
flag.BoolVar(&showVersion, "version", false, "Show version")
flag.BoolVar(&doUpgrade, "upgrade", false, "Perform upgrade")
flag.Usage = usageFor(flag.CommandLine, usage, extraUsage)
flag.Parse()
if showVersion {
fmt.Println(LongVersion)
return
}
if doUpgrade {
err := upgrade()
if err != nil {
l.Fatalln(err)
}
return
}
if len(os.Getenv("GOGC")) == 0 {
debug.SetGCPercent(25)
}
if len(os.Getenv("GOMAXPROCS")) == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
}
confDir = expandTilde(confDir)
if _, err := os.Stat(confDir); err != nil && confDir == getDefaultConfDir() {
// We are supposed to use the default configuration directory. It
// doesn't exist. In the past our default has been ~/.syncthing, so if
// that directory exists we move it to the new default location and
// continue. We don't much care if this fails at this point, we will
// be checking that later.
var oldDefault string
if runtime.GOOS == "windows" {
oldDefault = filepath.Join(os.Getenv("AppData"), "Syncthing")
} else {
oldDefault = expandTilde("~/.syncthing")
}
if _, err := os.Stat(oldDefault); err == nil {
os.MkdirAll(filepath.Dir(confDir), 0700)
if err := os.Rename(oldDefault, confDir); err == nil {
l.Infoln("Moved config dir", oldDefault, "to", confDir)
}
}
}
// Ensure that our home directory exists and that we have a certificate and key.
ensureDir(confDir, 0700)
cert, err := loadCert(confDir, "")
if err != nil {
newCertificate(confDir, "")
cert, err = loadCert(confDir, "")
l.FatalErr(err)
}
myID = certID(cert.Certificate[0])
l.SetPrefix(fmt.Sprintf("[%s] ", myID[:5]))
l.Infoln(LongVersion)
l.Infoln("My ID:", myID)
// Prepare to be able to save configuration
cfgFile := filepath.Join(confDir, "config.xml")
go saveConfigLoop(cfgFile)
// Load the configuration file, if it exists.
// If it does not, create a template.
cf, err := os.Open(cfgFile)
if err == nil {
// Read config.xml
cfg, err = config.Load(cf, myID)
if err != nil {
l.Fatalln(err)
}
cf.Close()
} else {
l.Infoln("No config file; starting with empty defaults")
name, _ := os.Hostname()
defaultRepo := filepath.Join(getHomeDir(), "Sync")
ensureDir(defaultRepo, 0755)
cfg, err = config.Load(nil, myID)
cfg.Repositories = []config.RepositoryConfiguration{
{
ID: "default",
Directory: defaultRepo,
Nodes: []config.NodeConfiguration{{NodeID: myID}},
},
}
cfg.Nodes = []config.NodeConfiguration{
{
NodeID: myID,
Addresses: []string{"dynamic"},
Name: name,
},
}
port, err := getFreePort("127.0.0.1", 8080)
l.FatalErr(err)
cfg.GUI.Address = fmt.Sprintf("127.0.0.1:%d", port)
port, err = getFreePort("0.0.0.0", 22000)
l.FatalErr(err)
cfg.Options.ListenAddress = []string{fmt.Sprintf("0.0.0.0:%d", port)}
saveConfig()
l.Infof("Edit %s to taste or use the GUI\n", cfgFile)
}
if reset {
resetRepositories()
return
}
if profiler := os.Getenv("STPROFILER"); 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)
}
}()
}
if len(os.Getenv("STRESTART")) > 0 {
waitForParentExit()
}
// 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"},
ServerName: myID,
ClientAuth: tls.RequestClientCert,
SessionTicketsDisabled: true,
InsecureSkipVerify: true,
MinVersion: tls.VersionTLS12,
}
// If the 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.
if cfg.Options.MaxSendKbps > 0 {
rateBucket = ratelimit.NewBucketWithRate(float64(1000*cfg.Options.MaxSendKbps), int64(5*1000*cfg.Options.MaxSendKbps))
}
m := model.NewModel(confDir, &cfg, "syncthing", Version)
for _, repo := range cfg.Repositories {
if repo.Invalid != "" {
continue
}
repo.Directory = expandTilde(repo.Directory)
m.AddRepo(repo)
}
// GUI
if cfg.GUI.Enabled && cfg.GUI.Address != "" {
addr, err := net.ResolveTCPAddr("tcp", cfg.GUI.Address)
if err != nil {
l.Fatalf("Cannot start GUI on %q: %v", cfg.GUI.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 cfg.GUI.UseTLS {
proto = "https"
}
l.Infof("Starting web GUI on %s://%s:%d/", proto, hostShow, addr.Port)
err := startGUI(cfg.GUI, os.Getenv("STGUIASSETS"), m)
if err != nil {
l.Fatalln("Cannot start GUI:", err)
}
if cfg.Options.StartBrowser && len(os.Getenv("STRESTART")) == 0 {
openURL(fmt.Sprintf("%s://%s:%d", proto, hostOpen, addr.Port))
}
}
}
// Walk the repository and update the local model before establishing any
// connections to other nodes.
l.Infoln("Populating repository index")
m.LoadIndexes(confDir)
for _, repo := range cfg.Repositories {
if repo.Invalid != "" {
continue
}
dir := expandTilde(repo.Directory)
// Safety check. If the cached index contains files but the repository
// doesn't exist, we have a problem. We would assume that all files
// have been deleted which might not be the case, so abort instead.
if files, _, _ := m.LocalSize(repo.ID); files > 0 {
if fi, err := os.Stat(dir); err != nil || !fi.IsDir() {
l.Warnf("Configured repository %q has index but directory %q is missing; not starting.", repo.ID, repo.Directory)
l.Fatalf("Ensure that directory is present or remove repository from configuration.")
}
}
// Ensure that repository directories exist for newly configured repositories.
ensureDir(dir, -1)
}
m.CleanRepos()
m.ScanRepos()
m.SaveIndexes(confDir)
// UPnP
var externalPort = 0
if cfg.Options.UPnPEnabled {
// We seed the random number generator with the node ID to get a
// repeatable sequence of random external ports.
rand.Seed(certSeed(cert.Certificate[0]))
externalPort = setupUPnP()
}
// Routine to connect out to configured nodes
discoverer = discovery(externalPort)
go listenConnect(myID, m, tlsCfg)
for _, repo := range cfg.Repositories {
if repo.Invalid != "" {
continue
}
// Routine to pull blocks from other nodes to synchronize the local
// repository. Does not run when we are in read only (publish only) mode.
if repo.ReadOnly {
l.Okf("Ready to synchronize %s (read only; no external updates accepted)", repo.ID)
m.StartRepoRO(repo.ID)
} else {
l.Okf("Ready to synchronize %s (read-write)", repo.ID)
m.StartRepoRW(repo.ID, cfg.Options.ParallelRequests)
}
}
if cpuprof := os.Getenv("STCPUPROFILE"); len(cpuprof) > 0 {
f, err := os.Create(cpuprof)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
for _, node := range cfg.Nodes {
if len(node.Name) > 0 {
l.Infof("Node %s is %q at %v", node.NodeID, node.Name, node.Addresses)
}
}
<-stop
l.Okln("Exiting")
}
func waitForParentExit() {
l.Infoln("Waiting for parent to exit...")
// Wait for the listen address to become free, indicating that the parent has exited.
for {
ln, err := net.Listen("tcp", cfg.Options.ListenAddress[0])
if err == nil {
ln.Close()
break
}
time.Sleep(250 * time.Millisecond)
}
l.Okln("Continuing")
}
func setupUPnP() int {
var externalPort = 0
if len(cfg.Options.ListenAddress) == 1 {
_, portStr, err := net.SplitHostPort(cfg.Options.ListenAddress[0])
if err != nil {
l.Warnln(err)
} else {
// Set up incoming port forwarding, if necessary and possible
port, _ := strconv.Atoi(portStr)
igd, err := upnp.Discover()
if err == nil {
for i := 0; i < 10; i++ {
r := 1024 + rand.Intn(65535-1024)
err := igd.AddPortMapping(upnp.TCP, r, port, "syncthing", 0)
if err == nil {
externalPort = r
l.Infoln("Created UPnP port mapping - external port", externalPort)
break
}
}
if externalPort == 0 {
l.Warnln("Failed to create UPnP port mapping")
}
} else {
l.Infof("No UPnP IGD device found, no port mapping created (%v)", err)
}
}
} else {
l.Warnln("Multiple listening addresses; not attempting UPnP port mapping")
}
return externalPort
}
func resetRepositories() {
suffix := fmt.Sprintf(".syncthing-reset-%d", time.Now().UnixNano())
for _, repo := range cfg.Repositories {
if _, err := os.Stat(repo.Directory); err == nil {
l.Infof("Reset: Moving %s -> %s", repo.Directory, repo.Directory+suffix)
os.Rename(repo.Directory, repo.Directory+suffix)
}
}
pat := filepath.Join(confDir, "*.idx.gz")
idxs, err := filepath.Glob(pat)
if err == nil {
for _, idx := range idxs {
l.Infof("Reset: Removing %s", idx)
os.Remove(idx)
}
}
}
func restart() {
l.Infoln("Restarting")
if os.Getenv("SMF_FMRI") != "" || os.Getenv("STNORESTART") != "" {
// Solaris SMF
l.Infoln("Service manager detected; exit instead of restart")
stop <- true
return
}
env := os.Environ()
if len(os.Getenv("STRESTART")) == 0 {
env = append(env, "STRESTART=1")
}
pgm, err := exec.LookPath(os.Args[0])
if err != nil {
l.Warnln(err)
return
}
proc, err := os.StartProcess(pgm, os.Args, &os.ProcAttr{
Env: env,
Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
})
if err != nil {
l.Fatalln(err)
}
proc.Release()
stop <- true
}
func shutdown() {
stop <- true
}
var saveConfigCh = make(chan struct{})
func saveConfigLoop(cfgFile string) {
for _ = range saveConfigCh {
fd, err := os.Create(cfgFile + ".tmp")
if err != nil {
l.Warnln(err)
continue
}
err = config.Save(fd, cfg)
if err != nil {
l.Warnln(err)
fd.Close()
continue
}
err = fd.Close()
if err != nil {
l.Warnln(err)
continue
}
err = osutil.Rename(cfgFile+".tmp", cfgFile)
if err != nil {
l.Warnln(err)
}
}
}
func saveConfig() {
saveConfigCh <- struct{}{}
}
func listenConnect(myID string, m *model.Model, tlsCfg *tls.Config) {
var conns = make(chan *tls.Conn)
// Listen
for _, addr := range cfg.Options.ListenAddress {
addr := addr
go func() {
if debugNet {
l.Debugln("listening on", addr)
}
listener, err := tls.Listen("tcp", addr, tlsCfg)
l.FatalErr(err)
for {
conn, err := listener.Accept()
if err != nil {
l.Warnln(err)
continue
}
if debugNet {
l.Debugln("connect from", conn.RemoteAddr())
}
tc := conn.(*tls.Conn)
err = tc.Handshake()
if err != nil {
l.Warnln(err)
tc.Close()
continue
}
conns <- tc
}
}()
}
// Connect
go func() {
for {
nextNode:
for _, nodeCfg := range cfg.Nodes {
if nodeCfg.NodeID == myID {
continue
}
if m.ConnectedTo(nodeCfg.NodeID) {
continue
}
var addrs []string
for _, addr := range nodeCfg.Addresses {
if addr == "dynamic" {
if discoverer != nil {
t := discoverer.Lookup(nodeCfg.NodeID)
if len(t) == 0 {
continue
}
addrs = append(addrs, t...)
}
} else {
addrs = append(addrs, addr)
}
}
for _, addr := range addrs {
host, port, err := net.SplitHostPort(addr)
if err != nil && strings.HasPrefix(err.Error(), "missing port") {
// addr is on the form "1.2.3.4"
addr = net.JoinHostPort(addr, "22000")
} else if err == nil && port == "" {
// addr is on the form "1.2.3.4:"
addr = net.JoinHostPort(host, "22000")
}
if debugNet {
l.Debugln("dial", nodeCfg.NodeID, addr)
}
conn, err := tls.Dial("tcp", addr, tlsCfg)
if err != nil {
if debugNet {
l.Debugln(err)
}
continue
}
conns <- conn
continue nextNode
}
}
time.Sleep(time.Duration(cfg.Options.ReconnectIntervalS) * time.Second)
}
}()
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
}
remoteID := certID(certs[0].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 node (%s)", remoteID)
conn.Close()
continue
}
for _, nodeCfg := range cfg.Nodes {
if nodeCfg.NodeID == remoteID {
var wr io.Writer = conn
if rateBucket != nil {
wr = &limitedWriter{conn, rateBucket}
}
protoConn := protocol.NewConnection(remoteID, conn, wr, m)
m.AddConnection(conn, protoConn)
continue next
}
}
l.Infof("Connection from %s with unknown node ID %s; ignoring", conn.RemoteAddr(), remoteID)
conn.Close()
}
}
func discovery(extPort int) *discover.Discoverer {
disc, err := discover.NewDiscoverer(myID, cfg.Options.ListenAddress, cfg.Options.LocalAnnPort)
if err != nil {
l.Warnf("No discovery possible (%v)", err)
return nil
}
if cfg.Options.LocalAnnEnabled {
l.Infoln("Sending local discovery announcements")
disc.StartLocal()
}
if cfg.Options.GlobalAnnEnabled {
l.Infoln("Sending global discovery announcements")
disc.StartGlobal(cfg.Options.GlobalAnnServer, uint16(extPort))
}
return disc
}
func ensureDir(dir string, mode int) {
fi, err := os.Stat(dir)
if os.IsNotExist(err) {
err := os.MkdirAll(dir, 0700)
l.FatalErr(err)
} else if mode >= 0 && err == nil && int(fi.Mode()&0777) != mode {
err := os.Chmod(dir, os.FileMode(mode))
l.FatalErr(err)
}
}
func getDefaultConfDir() string {
switch runtime.GOOS {
case "windows":
return filepath.Join(os.Getenv("LocalAppData"), "Syncthing")
case "darwin":
return expandTilde("~/Library/Application Support/Syncthing")
default:
if xdgCfg := os.Getenv("XDG_CONFIG_HOME"); xdgCfg != "" {
return filepath.Join(xdgCfg, "syncthing")
} else {
return expandTilde("~/.config/syncthing")
}
}
}
func expandTilde(p string) string {
if p == "~" {
return getHomeDir()
}
p = filepath.FromSlash(p)
if !strings.HasPrefix(p, fmt.Sprintf("~%c", os.PathSeparator)) {
return p
}
return filepath.Join(getHomeDir(), p[2:])
}
func getHomeDir() string {
var home string
switch runtime.GOOS {
case "windows":
home = filepath.Join(os.Getenv("HomeDrive"), os.Getenv("HomePath"))
if home == "" {
home = os.Getenv("UserProfile")
}
default:
home = os.Getenv("HOME")
}
if home == "" {
l.Fatalln("No home directory found - set $HOME (or the platform equivalent).")
}
return home
}
// getFreePort returns a free TCP port fort listening on. The ports given are
// tried in succession and the first to succeed is returned. If none succeed,
// a random high port is returned.
func getFreePort(host string, ports ...int) (int, error) {
for _, port := range ports {
c, err := net.Listen("tcp", fmt.Sprintf("%s:%d", host, port))
if err == nil {
c.Close()
return port, nil
}
}
c, err := net.Listen("tcp", host+":0")
if err != nil {
return 0, err
}
addr := c.Addr().String()
c.Close()
_, portstr, err := net.SplitHostPort(addr)
if err != nil {
return 0, err
}
port, err := strconv.Atoi(portstr)
if err != nil {
return 0, err
}
return port, nil
}