452 lines
12 KiB
Go
452 lines
12 KiB
Go
package main
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import (
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"compress/gzip"
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"crypto/tls"
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"fmt"
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"log"
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"net"
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"net/http"
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_ "net/http/pprof"
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"os"
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"path"
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"runtime"
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"runtime/debug"
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"strconv"
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"strings"
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"time"
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"github.com/calmh/ini"
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"github.com/calmh/syncthing/discover"
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flags "github.com/calmh/syncthing/github.com/jessevdk/go-flags"
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"github.com/calmh/syncthing/model"
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"github.com/calmh/syncthing/protocol"
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)
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type Options struct {
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ConfDir string `short:"c" long:"cfg" description:"Configuration directory" default:"~/.syncthing" value-name:"DIR"`
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Listen string `short:"l" long:"listen" description:"Listen address" default:":22000" value-name:"ADDR"`
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ReadOnly bool `short:"r" long:"ro" description:"Repository is read only"`
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Rehash bool `long:"rehash" description:"Ignore cache and rehash all files in repository"`
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NoDelete bool `long:"no-delete" description:"Never delete files"`
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NoSymlinks bool `long:"no-symlinks" description:"Don't follow first level symlinks in the repo"`
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NoStats bool `long:"no-stats" description:"Don't print model and connection statistics"`
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NoGUI bool `long:"no-gui" description:"Don't start GUI"`
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GUIAddr string `long:"gui-addr" description:"GUI listen address" default:"127.0.0.1:8080" value-name:"ADDR"`
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ShowVersion bool `short:"v" long:"version" description:"Show version"`
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Discovery DiscoveryOptions `group:"Discovery Options"`
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Advanced AdvancedOptions `group:"Advanced Options"`
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Debug DebugOptions `group:"Debugging Options"`
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}
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type DebugOptions struct {
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LogSource bool `long:"log-source"`
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TraceModel []string `long:"trace-model" value-name:"TRACE" description:"idx, net, file, need, pull"`
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TraceConnect bool `long:"trace-connect"`
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Profiler string `long:"profiler" value-name:"ADDR"`
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}
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type DiscoveryOptions struct {
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ExternalServer string `long:"ext-server" description:"External discovery server" value-name:"NAME" default:"syncthing.nym.se"`
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ExternalPort int `short:"e" long:"ext-port" description:"External listen port" value-name:"PORT" default:"22000"`
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NoExternalDiscovery bool `short:"n" long:"no-ext-announce" description:"Do not announce presence externally"`
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NoLocalDiscovery bool `short:"N" long:"no-local-announce" description:"Do not announce presence locally"`
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}
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type AdvancedOptions struct {
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RequestsInFlight int `long:"reqs-in-flight" description:"Parallell in flight requests per node" default:"8" value-name:"REQS"`
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LimitRate int `long:"send-rate" description:"Rate limit for outgoing data" default:"0" value-name:"KBPS"`
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ScanInterval time.Duration `long:"scan-intv" description:"Repository scan interval" default:"60s" value-name:"INTV"`
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ConnInterval time.Duration `long:"conn-intv" description:"Node reconnect interval" default:"60s" value-name:"INTV"`
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}
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var opts Options
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var Version string = "unknown-dev"
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const (
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confFileName = "syncthing.ini"
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)
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var (
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myID string
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config ini.Config
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nodeAddrs = make(map[string][]string)
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)
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func main() {
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_, err := flags.Parse(&opts)
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if err != nil {
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if err, ok := err.(*flags.Error); ok {
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if err.Type == flags.ErrHelp {
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os.Exit(0)
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}
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}
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fatalln(err)
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}
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if opts.ShowVersion {
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fmt.Println(Version)
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os.Exit(0)
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}
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if len(os.Getenv("GOGC")) == 0 {
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debug.SetGCPercent(25)
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}
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if len(os.Getenv("GOMAXPROCS")) == 0 {
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runtime.GOMAXPROCS(runtime.NumCPU())
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}
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if len(opts.Debug.TraceModel) > 0 || opts.Debug.LogSource {
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logger = log.New(os.Stderr, "", log.Lshortfile|log.Ldate|log.Ltime|log.Lmicroseconds)
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}
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opts.ConfDir = expandTilde(opts.ConfDir)
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infoln("Version", Version)
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// Ensure that our home directory exists and that we have a certificate and key.
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ensureDir(opts.ConfDir, 0700)
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cert, err := loadCert(opts.ConfDir)
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if err != nil {
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newCertificate(opts.ConfDir)
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cert, err = loadCert(opts.ConfDir)
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fatalErr(err)
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}
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myID = string(certId(cert.Certificate[0]))
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infoln("My ID:", myID)
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if opts.Debug.Profiler != "" {
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go func() {
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err := http.ListenAndServe(opts.Debug.Profiler, nil)
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if err != nil {
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warnln(err)
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}
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}()
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}
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// The TLS configuration is used for both the listening socket and outgoing
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// connections.
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cfg := &tls.Config{
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Certificates: []tls.Certificate{cert},
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NextProtos: []string{"bep/1.0"},
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ServerName: myID,
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ClientAuth: tls.RequestClientCert,
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SessionTicketsDisabled: true,
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InsecureSkipVerify: true,
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MinVersion: tls.VersionTLS12,
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}
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// Load the configuration file, if it exists.
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cf, err := os.Open(path.Join(opts.ConfDir, confFileName))
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if err != nil {
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fatalln("No config file")
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config = ini.Config{}
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}
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config = ini.Parse(cf)
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cf.Close()
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var dir = expandTilde(config.Get("repository", "dir"))
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// Create a map of desired node connections based on the configuration file
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// directives.
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for nodeID, addrs := range config.OptionMap("nodes") {
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addrs := strings.Fields(addrs)
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nodeAddrs[nodeID] = addrs
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}
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ensureDir(dir, -1)
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m := model.NewModel(dir)
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for _, t := range opts.Debug.TraceModel {
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m.Trace(t)
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}
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if opts.Advanced.LimitRate > 0 {
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m.LimitRate(opts.Advanced.LimitRate)
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}
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// GUI
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if !opts.NoGUI && opts.GUIAddr != "" {
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host, port, err := net.SplitHostPort(opts.GUIAddr)
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if err != nil {
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warnf("Cannot start GUI on %q: %v", opts.GUIAddr, err)
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} else {
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if len(host) > 0 {
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infof("Starting web GUI on http://%s", opts.GUIAddr)
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} else {
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infof("Starting web GUI on port %s", port)
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}
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startGUI(opts.GUIAddr, m)
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}
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}
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// Walk the repository and update the local model before establishing any
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// connections to other nodes.
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if !opts.Rehash {
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infoln("Loading index cache")
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loadIndex(m)
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}
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infoln("Populating repository index")
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updateLocalModel(m)
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// Routine to listen for incoming connections
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infoln("Listening for incoming connections")
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go listen(myID, opts.Listen, m, cfg)
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// Routine to connect out to configured nodes
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infoln("Attempting to connect to other nodes")
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go connect(myID, opts.Listen, nodeAddrs, m, cfg)
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// Routine to pull blocks from other nodes to synchronize the local
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// repository. Does not run when we are in read only (publish only) mode.
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if !opts.ReadOnly {
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if opts.NoDelete {
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infoln("Deletes from peer nodes will be ignored")
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} else {
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infoln("Deletes from peer nodes are allowed")
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}
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okln("Ready to synchronize (read-write)")
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m.StartRW(!opts.NoDelete, opts.Advanced.RequestsInFlight)
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} else {
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okln("Ready to synchronize (read only; no external updates accepted)")
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}
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// Periodically scan the repository and update the local model.
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// XXX: Should use some fsnotify mechanism.
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go func() {
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for {
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time.Sleep(opts.Advanced.ScanInterval)
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updateLocalModel(m)
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}
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}()
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if !opts.NoStats {
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// Periodically print statistics
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go printStatsLoop(m)
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}
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select {}
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}
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func printStatsLoop(m *model.Model) {
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var lastUpdated int64
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var lastStats = make(map[string]model.ConnectionInfo)
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for {
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time.Sleep(60 * time.Second)
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for node, stats := range m.ConnectionStats() {
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secs := time.Since(lastStats[node].At).Seconds()
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inbps := 8 * int(float64(stats.InBytesTotal-lastStats[node].InBytesTotal)/secs)
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outbps := 8 * int(float64(stats.OutBytesTotal-lastStats[node].OutBytesTotal)/secs)
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if inbps+outbps > 0 {
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infof("%s: %sb/s in, %sb/s out", node, MetricPrefix(inbps), MetricPrefix(outbps))
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}
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lastStats[node] = stats
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}
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if lu := m.Generation(); lu > lastUpdated {
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lastUpdated = lu
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files, _, bytes := m.GlobalSize()
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infof("%6d files, %9sB in cluster", files, BinaryPrefix(bytes))
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files, _, bytes = m.LocalSize()
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infof("%6d files, %9sB in local repo", files, BinaryPrefix(bytes))
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needFiles, bytes := m.NeedFiles()
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infof("%6d files, %9sB to synchronize", len(needFiles), BinaryPrefix(bytes))
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}
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}
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}
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func listen(myID string, addr string, m *model.Model, cfg *tls.Config) {
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l, err := tls.Listen("tcp", addr, cfg)
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fatalErr(err)
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listen:
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for {
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conn, err := l.Accept()
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if err != nil {
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warnln(err)
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continue
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}
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if opts.Debug.TraceConnect {
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debugln("NET: Connect from", conn.RemoteAddr())
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}
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tc := conn.(*tls.Conn)
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err = tc.Handshake()
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if err != nil {
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warnln(err)
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tc.Close()
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continue
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}
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remoteID := certId(tc.ConnectionState().PeerCertificates[0].Raw)
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if remoteID == myID {
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warnf("Connect from myself (%s) - should not happen", remoteID)
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conn.Close()
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continue
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}
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if m.ConnectedTo(remoteID) {
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warnf("Connect from connected node (%s)", remoteID)
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}
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for nodeID := range nodeAddrs {
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if nodeID == remoteID {
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protoConn := protocol.NewConnection(remoteID, conn, conn, m)
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m.AddConnection(conn, protoConn)
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continue listen
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}
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}
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conn.Close()
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}
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}
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func connect(myID string, addr string, nodeAddrs map[string][]string, m *model.Model, cfg *tls.Config) {
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_, portstr, err := net.SplitHostPort(addr)
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fatalErr(err)
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port, _ := strconv.Atoi(portstr)
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if opts.Discovery.NoLocalDiscovery {
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port = -1
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} else {
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infoln("Sending local discovery announcements")
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}
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if opts.Discovery.NoExternalDiscovery {
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opts.Discovery.ExternalPort = -1
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} else {
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infoln("Sending external discovery announcements")
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}
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disc, err := discover.NewDiscoverer(myID, port, opts.Discovery.ExternalPort, opts.Discovery.ExternalServer)
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if err != nil {
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warnf("No discovery possible (%v)", err)
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}
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for {
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nextNode:
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for nodeID, addrs := range nodeAddrs {
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if nodeID == myID {
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continue
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}
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if m.ConnectedTo(nodeID) {
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continue
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}
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for _, addr := range addrs {
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if addr == "dynamic" {
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var ok bool
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if disc != nil {
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addr, ok = disc.Lookup(nodeID)
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}
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if !ok {
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continue
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}
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}
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if opts.Debug.TraceConnect {
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debugln("NET: Dial", nodeID, addr)
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}
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conn, err := tls.Dial("tcp", addr, cfg)
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if err != nil {
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if opts.Debug.TraceConnect {
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debugln("NET:", err)
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}
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continue
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}
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remoteID := certId(conn.ConnectionState().PeerCertificates[0].Raw)
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if remoteID != nodeID {
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warnln("Unexpected nodeID", remoteID, "!=", nodeID)
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conn.Close()
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continue
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}
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protoConn := protocol.NewConnection(remoteID, conn, conn, m)
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m.AddConnection(conn, protoConn)
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continue nextNode
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}
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}
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time.Sleep(opts.Advanced.ConnInterval)
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}
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}
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func updateLocalModel(m *model.Model) {
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files, _ := m.Walk(!opts.NoSymlinks)
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m.ReplaceLocal(files)
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saveIndex(m)
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}
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func saveIndex(m *model.Model) {
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name := m.RepoID() + ".idx.gz"
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fullName := path.Join(opts.ConfDir, name)
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idxf, err := os.Create(fullName + ".tmp")
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if err != nil {
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return
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}
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gzw := gzip.NewWriter(idxf)
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protocol.WriteIndex(gzw, m.ProtocolIndex())
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gzw.Close()
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idxf.Close()
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os.Rename(fullName+".tmp", fullName)
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}
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func loadIndex(m *model.Model) {
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name := m.RepoID() + ".idx.gz"
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idxf, err := os.Open(path.Join(opts.ConfDir, name))
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if err != nil {
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return
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}
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defer idxf.Close()
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gzr, err := gzip.NewReader(idxf)
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if err != nil {
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return
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}
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defer gzr.Close()
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idx, err := protocol.ReadIndex(gzr)
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if err != nil {
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return
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}
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m.SeedLocal(idx)
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}
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func ensureDir(dir string, mode int) {
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fi, err := os.Stat(dir)
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if os.IsNotExist(err) {
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err := os.MkdirAll(dir, 0700)
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fatalErr(err)
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} else if mode >= 0 && err == nil && int(fi.Mode()&0777) != mode {
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err := os.Chmod(dir, os.FileMode(mode))
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fatalErr(err)
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}
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}
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func expandTilde(p string) string {
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if strings.HasPrefix(p, "~/") {
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return strings.Replace(p, "~", getHomeDir(), 1)
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}
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return p
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}
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func getHomeDir() string {
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home := os.Getenv("HOME")
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if home == "" {
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fatalln("No home directory?")
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}
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return home
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}
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