syncthing/main.go
2013-12-18 19:36:28 +01:00

325 lines
7.3 KiB
Go

package main
import (
"crypto/sha1"
"crypto/tls"
"fmt"
"log"
"net"
"net/http"
_ "net/http/pprof"
"os"
"path"
"strconv"
"strings"
"time"
"github.com/calmh/ini"
"github.com/calmh/syncthing/discover"
"github.com/calmh/syncthing/protocol"
flags "github.com/jessevdk/go-flags"
)
type Options struct {
ConfDir string `short:"c" long:"cfg" description:"Configuration directory" default:"~/.syncthing" value-name:"DIR"`
Listen string `short:"l" long:"listen" description:"Listen address" default:":22000" value-name:"ADDR"`
ReadOnly bool `long:"ro" description:"Repository is read only"`
Delete bool `long:"delete" description:"Delete files from repo when deleted from cluster"`
NoSymlinks bool `long:"no-symlinks" description:"Don't follow first level symlinks in the repo"`
ScanInterval time.Duration `long:"scan-intv" description:"Repository scan interval" default:"60s" value-name:"INTV"`
ConnInterval time.Duration `long:"conn-intv" description:"Node reconnect interval" default:"60s" value-name:"INTV"`
Debug DebugOptions `group:"Debugging Options"`
}
type DebugOptions struct {
TraceFile bool `long:"trace-file"`
TraceNet bool `long:"trace-net"`
TraceIdx bool `long:"trace-idx"`
Profiler string `long:"profiler"`
}
var opts Options
const (
confDirName = ".syncthing"
confFileName = "syncthing.ini"
)
var (
config ini.Config
nodeAddrs = make(map[string][]string)
)
// Options
var (
ConfDir = path.Join(getHomeDir(), confDirName)
)
func main() {
// Useful for debugging; to be adjusted.
log.SetFlags(log.Ltime | log.Lshortfile)
_, err := flags.Parse(&opts)
if err != nil {
os.Exit(0)
}
if strings.HasPrefix(opts.ConfDir, "~/") {
opts.ConfDir = strings.Replace(opts.ConfDir, "~", getHomeDir(), 1)
}
// Ensure that our home directory exists and that we have a certificate and key.
ensureDir(ConfDir)
cert, err := loadCert(ConfDir)
if err != nil {
newCertificate(ConfDir)
cert, err = loadCert(ConfDir)
fatalErr(err)
}
myID := string(certId(cert.Certificate[0]))
infoln("My ID:", myID)
if opts.Debug.Profiler != "" {
go func() {
err := http.ListenAndServe(opts.Debug.Profiler, nil)
if err != nil {
warnln(err)
}
}()
}
// The TLS configuration is used for both the listening socket and outgoing
// connections.
cfg := &tls.Config{
ClientAuth: tls.RequestClientCert,
ServerName: "syncthing",
NextProtos: []string{"bep/1.0"},
InsecureSkipVerify: true,
Certificates: []tls.Certificate{cert},
}
// Load the configuration file, if it exists.
cf, err := os.Open(path.Join(ConfDir, confFileName))
if err != nil {
fatalln("No config file")
config = ini.Config{}
}
config = ini.Parse(cf)
cf.Close()
var dir = config.Get("repository", "dir")
// Create a map of desired node connections based on the configuration file
// directives.
for nodeID, addrs := range config.OptionMap("nodes") {
addrs := strings.Fields(addrs)
nodeAddrs[nodeID] = addrs
}
m := NewModel(dir)
// Walk the repository and update the local model before establishing any
// connections to other nodes.
infoln("Initial repository scan in progress")
loadIndex(m)
updateLocalModel(m)
// Routine to listen for incoming connections
infoln("Listening for incoming connections")
go listen(myID, opts.Listen, m, cfg)
// Routine to connect out to configured nodes
infoln("Attempting to connect to other nodes")
go connect(myID, opts.Listen, nodeAddrs, m, cfg)
// 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 !opts.ReadOnly {
infoln("Cleaning out incomplete synchronizations")
CleanTempFiles(dir)
okln("Ready to synchronize")
m.Start()
}
// Periodically scan the repository and update the local model.
// XXX: Should use some fsnotify mechanism.
go func() {
for {
time.Sleep(time.Duration(opts.ScanInterval) * time.Second)
updateLocalModel(m)
}
}()
select {}
}
func listen(myID string, addr string, m *Model, cfg *tls.Config) {
l, err := tls.Listen("tcp", addr, cfg)
fatalErr(err)
listen:
for {
conn, err := l.Accept()
if err != nil {
warnln(err)
continue
}
if opts.Debug.TraceNet {
debugln("NET: Connect from", conn.RemoteAddr())
}
tc := conn.(*tls.Conn)
err = tc.Handshake()
if err != nil {
warnln(err)
tc.Close()
continue
}
remoteID := certId(tc.ConnectionState().PeerCertificates[0].Raw)
if remoteID == myID {
warnf("Connect from myself (%s) - should not happen", remoteID)
conn.Close()
continue
}
if m.ConnectedTo(remoteID) {
warnf("Connect from connected node (%s)", remoteID)
}
for nodeID := range nodeAddrs {
if nodeID == remoteID {
nc := protocol.NewConnection(remoteID, conn, conn, m)
m.AddNode(nc)
okln("Connected to nodeID", remoteID, "(in)")
continue listen
}
}
warnln("Connect from unknown node", remoteID)
conn.Close()
}
}
func connect(myID string, addr string, nodeAddrs map[string][]string, m *Model, cfg *tls.Config) {
_, portstr, err := net.SplitHostPort(addr)
fatalErr(err)
port, _ := strconv.Atoi(portstr)
infoln("Starting local discovery")
disc, err := discover.NewDiscoverer(myID, port)
if err != nil {
warnln("No local discovery possible")
}
for {
nextNode:
for nodeID, addrs := range nodeAddrs {
if nodeID == myID {
continue
}
if m.ConnectedTo(nodeID) {
continue
}
for _, addr := range addrs {
if addr == "dynamic" {
var ok bool
if disc != nil {
addr, ok = disc.Lookup(nodeID)
}
if !ok {
continue
}
}
if opts.Debug.TraceNet {
debugln("NET: Dial", nodeID, addr)
}
conn, err := tls.Dial("tcp", addr, cfg)
if err != nil {
if opts.Debug.TraceNet {
debugln("NET:", err)
}
continue
}
remoteID := certId(conn.ConnectionState().PeerCertificates[0].Raw)
if remoteID != nodeID {
warnln("Unexpected nodeID", remoteID, "!=", nodeID)
conn.Close()
continue
}
nc := protocol.NewConnection(nodeID, conn, conn, m)
okln("Connected to node", remoteID, "(out)")
m.AddNode(nc)
if opts.Debug.TraceNet {
t0 := time.Now()
nc.Ping()
timing("NET: Ping reply", t0)
}
continue nextNode
}
}
time.Sleep(time.Duration(opts.ConnInterval) * time.Second)
}
}
func updateLocalModel(m *Model) {
files := Walk(m.Dir(), m, !opts.NoSymlinks)
m.ReplaceLocal(files)
saveIndex(m)
}
func saveIndex(m *Model) {
fname := fmt.Sprintf("%x.idx", sha1.Sum([]byte(m.Dir())))
idxf, err := os.Create(path.Join(ConfDir, fname))
if err != nil {
return
}
protocol.WriteIndex(idxf, m.ProtocolIndex())
idxf.Close()
}
func loadIndex(m *Model) {
fname := fmt.Sprintf("%x.idx", sha1.Sum([]byte(m.Dir())))
idxf, err := os.Open(path.Join(ConfDir, fname))
if err != nil {
return
}
defer idxf.Close()
idx, err := protocol.ReadIndex(idxf)
if err != nil {
return
}
m.SeedIndex(idx)
}
func ensureDir(dir string) {
fi, err := os.Stat(dir)
if os.IsNotExist(err) {
err := os.MkdirAll(dir, 0700)
fatalErr(err)
} else if fi.Mode()&0077 != 0 {
err := os.Chmod(dir, 0700)
fatalErr(err)
}
}
func getHomeDir() string {
home := os.Getenv("HOME")
if home == "" {
fatalln("No home directory?")
}
return home
}