forked from syncthing/syncthing
/
main.go
1331 lines (1123 loc) · 38.9 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright (C) 2014 The Syncthing Authors.
//
// 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 https://mozilla.org/MPL/2.0/.
package main
import (
"bytes"
"crypto/tls"
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"path"
"path/filepath"
"regexp"
"runtime"
"runtime/pprof"
"sort"
"strconv"
"strings"
"syscall"
"time"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/connections"
"github.com/syncthing/syncthing/lib/db"
"github.com/syncthing/syncthing/lib/dialer"
"github.com/syncthing/syncthing/lib/discover"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/fs"
"github.com/syncthing/syncthing/lib/logger"
"github.com/syncthing/syncthing/lib/model"
"github.com/syncthing/syncthing/lib/osutil"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/rand"
"github.com/syncthing/syncthing/lib/sha256"
"github.com/syncthing/syncthing/lib/tlsutil"
"github.com/syncthing/syncthing/lib/upgrade"
"github.com/calmh/suture"
_ "net/http/pprof" // Need to import this to support STPROFILER.
)
var (
Version = "unknown-dev"
Codename = "Dysprosium Dragonfly"
BuildStamp = "0"
BuildDate time.Time
BuildHost = "unknown"
BuildUser = "unknown"
IsRelease bool
IsCandidate bool
IsBeta bool
LongVersion string
BuildTags []string
allowedVersionExp = regexp.MustCompile(`^v\d+\.\d+\.\d+(-[a-z0-9]+)*(\.\d+)*(\+\d+-g[0-9a-f]+)?(-[^\s]+)?$`)
)
const (
exitSuccess = 0
exitError = 1
exitNoUpgradeAvailable = 2
exitRestarting = 3
exitUpgrading = 4
)
const (
bepProtocolName = "bep/1.0"
tlsDefaultCommonName = "syncthing"
httpsRSABits = 2048
bepRSABits = 0 // 384 bit ECDSA used instead
defaultEventTimeout = time.Minute
maxSystemErrors = 5
initialSystemLog = 10
maxSystemLog = 250
)
func init() {
if Version != "unknown-dev" {
// If not a generic dev build, version string should come from git describe
if !allowedVersionExp.MatchString(Version) {
l.Fatalf("Invalid version string %q;\n\tdoes not match regexp %v", Version, allowedVersionExp)
}
}
}
func setBuildMetadata() {
// Check for a clean release build. A release is something like
// "v0.1.2", with an optional suffix of letters and dot separated
// numbers like "-beta3.47". If there's more stuff, like a plus sign and
// a commit hash and so on, then it's not a release. If it has a dash in
// it, it's some sort of beta, release candidate or special build. If it
// has "-rc." in it, like "v0.14.35-rc.42", then it's a candidate build.
//
// So, every build that is not a stable release build has IsBeta = true.
// This is used to enable some extra debugging (the deadlock detector).
//
// Release candidate builds are also "betas" from this point of view and
// will have that debugging enabled. In addition, some features are
// forced for release candidates - auto upgrade, and usage reporting.
exp := regexp.MustCompile(`^v\d+\.\d+\.\d+(-[a-z]+[\d\.]+)?$`)
IsRelease = exp.MatchString(Version)
IsCandidate = strings.Contains(Version, "-rc.")
IsBeta = strings.Contains(Version, "-")
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, Codename, runtime.Version(), runtime.GOOS, runtime.GOARCH, BuildUser, BuildHost, date)
if len(BuildTags) > 0 {
LongVersion = fmt.Sprintf("%s [%s]", LongVersion, strings.Join(BuildTags, ", "))
}
}
var (
myID protocol.DeviceID
stop = make(chan int)
lans []*net.IPNet
)
const (
usage = "syncthing [options]"
extraUsage = `
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.
STNODEFAULTFOLDER Don't create a default folder when starting for the first
time. This variable will be ignored anytime after the first
run.
STGUIASSETS Directory to load GUI assets from. Overrides compiled in
assets.
STTRACE A comma separated string of facilities to trace. The valid
facility strings listed below.
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.
STDEADLOCKTIMEOUT Used for debugging internal deadlocks; sets debug
sensitivity. Use only under direction of a developer.
STLOCKTHRESHOLD Used for debugging internal deadlocks; sets debug
sensitivity. Use only under direction of a developer.
STNORESTART Equivalent to the -no-restart argument. Disable the
Syncthing monitor process which handles restarts for some
configuration changes, upgrades, crashes and also log file
writing (stdout is still written).
STNOUPGRADE Disable automatic upgrades.
STHASHING Select the SHA256 hashing package to use. Possible values
are "standard" for the Go standard library implementation,
"minio" for the github.com/minio/sha256-simd implementation,
and blank (the default) for auto detection.
STRECHECKDBEVERY Set to a time interval to override the default database
check interval of 30 days (720h). The interval understands
"h", "m" and "s" abbreviations for hours minutes and seconds.
Valid values are like "720h", "30s", etc.
GOMAXPROCS Set the maximum number of CPU cores to use. Defaults to all
available CPU cores.
GOGC Percentage of heap growth at which to trigger GC. Default is
100. Lower numbers keep peak memory usage down, at the price
of CPU usage (i.e. performance).
Debugging Facilities
--------------------
The following are valid values for the STTRACE variable:
%s`
)
// Environment options
var (
noUpgradeFromEnv = os.Getenv("STNOUPGRADE") != ""
innerProcess = os.Getenv("STNORESTART") != "" || os.Getenv("STMONITORED") != ""
noDefaultFolder = os.Getenv("STNODEFAULTFOLDER") != ""
)
type RuntimeOptions struct {
confDir string
resetDatabase bool
resetDeltaIdxs bool
showVersion bool
showPaths bool
showDeviceId bool
doUpgrade bool
doUpgradeCheck bool
upgradeTo string
noBrowser bool
browserOnly bool
hideConsole bool
logFile string
auditEnabled bool
auditFile string
verbose bool
paused bool
unpaused bool
guiAddress string
guiAPIKey string
generateDir string
noRestart bool
profiler string
assetDir string
cpuProfile bool
stRestarting bool
logFlags int
}
func defaultRuntimeOptions() RuntimeOptions {
options := RuntimeOptions{
noRestart: os.Getenv("STNORESTART") != "",
profiler: os.Getenv("STPROFILER"),
assetDir: os.Getenv("STGUIASSETS"),
cpuProfile: os.Getenv("STCPUPROFILE") != "",
stRestarting: os.Getenv("STRESTART") != "",
logFlags: log.Ltime,
}
if os.Getenv("STTRACE") != "" {
options.logFlags = logger.DebugFlags
}
if runtime.GOOS != "windows" {
// On non-Windows, we explicitly default to "-" which means stdout. On
// Windows, the blank options.logFile will later be replaced with the
// default path, unless the user has manually specified "-" or
// something else.
options.logFile = "-"
}
return options
}
func parseCommandLineOptions() RuntimeOptions {
options := defaultRuntimeOptions()
flag.StringVar(&options.generateDir, "generate", "", "Generate key and config in specified dir, then exit")
flag.StringVar(&options.guiAddress, "gui-address", options.guiAddress, "Override GUI address (e.g. \"http://192.0.2.42:8443\")")
flag.StringVar(&options.guiAPIKey, "gui-apikey", options.guiAPIKey, "Override GUI API key")
flag.StringVar(&options.confDir, "home", "", "Set configuration directory")
flag.IntVar(&options.logFlags, "logflags", options.logFlags, "Select information in log line prefix (see below)")
flag.BoolVar(&options.noBrowser, "no-browser", false, "Do not start browser")
flag.BoolVar(&options.browserOnly, "browser-only", false, "Open GUI in browser")
flag.BoolVar(&options.noRestart, "no-restart", options.noRestart, "Disable monitor process, managed restarts and log file writing")
flag.BoolVar(&options.resetDatabase, "reset-database", false, "Reset the database, forcing a full rescan and resync")
flag.BoolVar(&options.resetDeltaIdxs, "reset-deltas", false, "Reset delta index IDs, forcing a full index exchange")
flag.BoolVar(&options.doUpgrade, "upgrade", false, "Perform upgrade")
flag.BoolVar(&options.doUpgradeCheck, "upgrade-check", false, "Check for available upgrade")
flag.BoolVar(&options.showVersion, "version", false, "Show version")
flag.BoolVar(&options.showPaths, "paths", false, "Show configuration paths")
flag.BoolVar(&options.showDeviceId, "device-id", false, "Show the device ID")
flag.StringVar(&options.upgradeTo, "upgrade-to", options.upgradeTo, "Force upgrade directly from specified URL")
flag.BoolVar(&options.auditEnabled, "audit", false, "Write events to audit file")
flag.BoolVar(&options.verbose, "verbose", false, "Print verbose log output")
flag.BoolVar(&options.paused, "paused", false, "Start with all devices and folders paused")
flag.BoolVar(&options.unpaused, "unpaused", false, "Start with all devices and folders unpaused")
flag.StringVar(&options.logFile, "logfile", options.logFile, "Log file name (still always logs to stdout). Cannot be used together with -no-restart/STNORESTART environment variable.")
flag.StringVar(&options.auditFile, "auditfile", options.auditFile, "Specify audit file (use \"-\" for stdout, \"--\" for stderr)")
if runtime.GOOS == "windows" {
// Allow user to hide the console window
flag.BoolVar(&options.hideConsole, "no-console", false, "Hide console window")
}
longUsage := fmt.Sprintf(extraUsage, debugFacilities())
flag.Usage = usageFor(flag.CommandLine, usage, longUsage)
flag.Parse()
if len(flag.Args()) > 0 {
flag.Usage()
os.Exit(2)
}
return options
}
func main() {
setBuildMetadata()
options := parseCommandLineOptions()
l.SetFlags(options.logFlags)
if options.guiAddress != "" {
// The config picks this up from the environment.
os.Setenv("STGUIADDRESS", options.guiAddress)
}
if options.guiAPIKey != "" {
// The config picks this up from the environment.
os.Setenv("STGUIAPIKEY", options.guiAPIKey)
}
// Check for options which are not compatible with each other. We have
// to check logfile before it's set to the default below - we only want
// to complain if they set -logfile explicitly, not if it's set to its
// default location
if options.noRestart && (options.logFile != "" && options.logFile != "-") {
l.Fatalln("-logfile may not be used with -no-restart or STNORESTART")
}
if options.hideConsole {
osutil.HideConsole()
}
if options.confDir != "" {
// Not set as default above because the string can be really long.
if !filepath.IsAbs(options.confDir) {
var err error
options.confDir, err = filepath.Abs(options.confDir)
if err != nil {
l.Fatalln(err)
}
}
baseDirs["config"] = options.confDir
}
if err := expandLocations(); err != nil {
l.Fatalln(err)
}
if options.logFile == "" {
// Blank means use the default logfile location. We must set this
// *after* expandLocations above.
options.logFile = locations[locLogFile]
}
if options.assetDir == "" {
// The asset dir is blank if STGUIASSETS wasn't set, in which case we
// should look for extra assets in the default place.
options.assetDir = locations[locGUIAssets]
}
if options.showVersion {
fmt.Println(LongVersion)
return
}
if options.showPaths {
showPaths(options)
return
}
if options.showDeviceId {
cert, err := tls.LoadX509KeyPair(locations[locCertFile], locations[locKeyFile])
if err != nil {
l.Fatalln("Error reading device ID:", err)
}
myID = protocol.NewDeviceID(cert.Certificate[0])
fmt.Println(myID)
return
}
if options.browserOnly {
openGUI()
return
}
if options.generateDir != "" {
generate(options.generateDir)
return
}
// Ensure that our home directory exists.
ensureDir(baseDirs["config"], 0700)
if options.upgradeTo != "" {
err := upgrade.ToURL(options.upgradeTo)
if err != nil {
l.Fatalln("Upgrade:", err) // exits 1
}
l.Infoln("Upgraded from", options.upgradeTo)
return
}
if options.doUpgradeCheck {
checkUpgrade()
return
}
if options.doUpgrade {
release := checkUpgrade()
performUpgrade(release)
return
}
if options.resetDatabase {
resetDB()
return
}
if innerProcess || options.noRestart {
syncthingMain(options)
} else {
monitorMain(options)
}
}
func openGUI() {
cfg, _ := loadOrDefaultConfig()
if cfg.GUI().Enabled {
openURL(cfg.GUI().URL())
} else {
l.Warnln("Browser: GUI is currently disabled")
}
}
func generate(generateDir string) {
dir, err := fs.ExpandTilde(generateDir)
if err != nil {
l.Fatalln("generate:", err)
}
ensureDir(dir, 0700)
certFile, keyFile := filepath.Join(dir, "cert.pem"), filepath.Join(dir, "key.pem")
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err == nil {
l.Warnln("Key exists; will not overwrite.")
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
} else {
cert, err = tlsutil.NewCertificate(certFile, keyFile, tlsDefaultCommonName, bepRSABits)
if err != nil {
l.Fatalln("Create certificate:", err)
}
myID = protocol.NewDeviceID(cert.Certificate[0])
if err != nil {
l.Fatalln("Load certificate:", 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 cfg = defaultConfig(cfgFile)
err = cfg.Save()
if err != nil {
l.Warnln("Failed to save config", err)
}
}
func debugFacilities() string {
facilities := l.Facilities()
// Get a sorted list of names
var names []string
maxLen := 0
for name := range facilities {
names = append(names, name)
if len(name) > maxLen {
maxLen = len(name)
}
}
sort.Strings(names)
// Format the choices
b := new(bytes.Buffer)
for _, name := range names {
fmt.Fprintf(b, " %-*s - %s\n", maxLen, name, facilities[name])
}
return b.String()
}
func checkUpgrade() upgrade.Release {
cfg, _ := loadOrDefaultConfig()
opts := cfg.Options()
release, err := upgrade.LatestRelease(opts.ReleasesURL, Version, opts.UpgradeToPreReleases)
if err != nil {
l.Fatalln("Upgrade:", err)
}
if upgrade.CompareVersions(release.Tag, Version) <= 0 {
noUpgradeMessage := "No upgrade available (current %q >= latest %q)."
l.Infof(noUpgradeMessage, Version, release.Tag)
os.Exit(exitNoUpgradeAvailable)
}
l.Infof("Upgrade available (current %q < latest %q)", Version, release.Tag)
return release
}
func performUpgrade(release upgrade.Release) {
// Use leveldb database locks to protect against concurrent upgrades
_, err := db.Open(locations[locDatabase])
if err == nil {
err = upgrade.To(release)
if err != nil {
l.Fatalln("Upgrade:", err)
}
l.Infof("Upgraded to %q", release.Tag)
} else {
l.Infoln("Attempting upgrade through running Syncthing...")
err = upgradeViaRest()
if err != nil {
l.Fatalln("Upgrade:", err)
}
l.Infoln("Syncthing upgrading")
os.Exit(exitUpgrading)
}
}
func upgradeViaRest() error {
cfg, _ := loadOrDefaultConfig()
u, err := url.Parse(cfg.GUI().URL())
if err != nil {
return err
}
u.Path = path.Join(u.Path, "rest/system/upgrade")
target := u.String()
r, _ := http.NewRequest("POST", target, nil)
r.Header.Set("X-API-Key", cfg.GUI().APIKey)
tr := &http.Transport{
Dial: dialer.Dial,
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{
Transport: tr,
Timeout: 60 * time.Second,
}
resp, err := client.Do(r)
if err != nil {
return err
}
if resp.StatusCode != 200 {
bs, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
return err
}
return errors.New(string(bs))
}
return err
}
func syncthingMain(runtimeOptions RuntimeOptions) {
setupSignalHandling()
// Create a main service manager. We'll add things to this as we go along.
// We want any logging it does to go through our log system.
mainService := suture.New("main", suture.Spec{
Log: func(line string) {
l.Debugln(line)
},
PanicPanics: true,
})
mainService.ServeBackground()
// Set a log prefix similar to the ID we will have later on, or early log
// lines look ugly.
l.SetPrefix("[start] ")
if runtimeOptions.auditEnabled {
startAuditing(mainService, runtimeOptions.auditFile)
}
if runtimeOptions.verbose {
mainService.Add(newVerboseService())
}
errors := logger.NewRecorder(l, logger.LevelWarn, maxSystemErrors, 0)
systemLog := logger.NewRecorder(l, logger.LevelDebug, maxSystemLog, initialSystemLog)
// Event subscription for the API; must start early to catch the early
// events. The LocalChangeDetected event might overwhelm the event
// receiver in some situations so we will not subscribe to it here.
defaultSub := events.NewBufferedSubscription(events.Default.Subscribe(defaultEventMask), eventSubBufferSize)
diskSub := events.NewBufferedSubscription(events.Default.Subscribe(diskEventMask), eventSubBufferSize)
if len(os.Getenv("GOMAXPROCS")) == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
}
// Attempt to increase the limit on number of open files to the maximum
// allowed, in case we have many peers. We don't really care enough to
// report the error if there is one.
osutil.MaximizeOpenFileLimit()
// Ensure that we have a certificate and key.
cert, err := tls.LoadX509KeyPair(locations[locCertFile], locations[locKeyFile])
if err != nil {
l.Infof("Generating ECDSA key and certificate for %s...", tlsDefaultCommonName)
cert, err = tlsutil.NewCertificate(locations[locCertFile], locations[locKeyFile], tlsDefaultCommonName, bepRSABits)
if err != nil {
l.Fatalln(err)
}
}
myID = protocol.NewDeviceID(cert.Certificate[0])
l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))
l.Infoln(LongVersion)
l.Infoln("My ID:", myID)
// Select SHA256 implementation and report. Affected by the
// STHASHING environment variable.
sha256.SelectAlgo()
sha256.Report()
// Emit the Starting event, now that we know who we are.
events.Default.Log(events.Starting, map[string]string{
"home": baseDirs["config"],
"myID": myID.String(),
})
cfg := loadConfigAtStartup()
if err := checkShortIDs(cfg); err != nil {
l.Fatalln("Short device IDs are in conflict. Unlucky!\n Regenerate the device ID of one of the following:\n ", err)
}
if len(runtimeOptions.profiler) > 0 {
go func() {
l.Debugln("Starting profiler on", runtimeOptions.profiler)
runtime.SetBlockProfileRate(1)
err := http.ListenAndServe(runtimeOptions.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{bepProtocolName},
ClientAuth: tls.RequestClientCert,
SessionTicketsDisabled: true,
InsecureSkipVerify: true,
MinVersion: tls.VersionTLS12,
CipherSuites: []uint16{
0xCCA8, // TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305, Go 1.8
0xCCA9, // TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, Go 1.8
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
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,
},
}
perf := cpuBench(3, 150*time.Millisecond, true)
l.Infof("Hashing performance is %.02f MB/s", perf)
dbFile := locations[locDatabase]
ldb, err := db.Open(dbFile)
if err != nil {
l.Fatalln("Error opening database:", err)
}
if runtimeOptions.resetDeltaIdxs {
l.Infoln("Reinitializing delta index IDs")
ldb.DropLocalDeltaIndexIDs()
ldb.DropRemoteDeltaIndexIDs()
}
protectedFiles := []string{
locations[locDatabase],
locations[locConfigFile],
locations[locCertFile],
locations[locKeyFile],
}
// Remove database entries for folders that no longer exist in the config
folders := cfg.Folders()
for _, folder := range ldb.ListFolders() {
if _, ok := folders[folder]; !ok {
l.Infof("Cleaning data for dropped folder %q", folder)
db.DropFolder(ldb, folder)
}
}
// Grab the previously running version string from the database.
miscDB := db.NewNamespacedKV(ldb, string(db.KeyTypeMiscData))
prevVersion, _ := miscDB.String("prevVersion")
// Strip away prerelease/beta stuff and just compare the release
// numbers. 0.14.44 to 0.14.45-banana is an upgrade, 0.14.45-banana to
// 0.14.45-pineapple is not.
prevParts := strings.Split(prevVersion, "-")
curParts := strings.Split(Version, "-")
if prevParts[0] != curParts[0] {
if prevVersion != "" {
//Check Syncthing version is wheather downgrading
if upgrade.CompareVersions(curParts[0], prevParts[0]) == upgrade.Older || upgrade.CompareVersions(curParts[0], prevParts[0]) == upgrade.MajorOlder {
l.Infof("Current Syncthing Version: %s, Loading Syncthing Version: %s: (Syncthing Version Mismatch)", prevVersion, Version)
}
l.Infoln("Detected upgrade from", prevVersion, "to", Version)
}
// Drop delta indexes in case we've changed random stuff we
// shouldn't have. We will resend our index on next connect.
ldb.DropLocalDeltaIndexIDs()
// Remember the new version.
miscDB.PutString("prevVersion", Version)
}
m := model.NewModel(cfg, myID, "syncthing", Version, ldb, protectedFiles)
if t := os.Getenv("STDEADLOCKTIMEOUT"); t != "" {
if secs, _ := strconv.Atoi(t); secs > 0 {
m.StartDeadlockDetector(time.Duration(secs) * time.Second)
}
} else if !IsRelease || IsBeta {
m.StartDeadlockDetector(20 * time.Minute)
}
if runtimeOptions.unpaused {
setPauseState(cfg, false)
} else if runtimeOptions.paused {
setPauseState(cfg, true)
}
// Add and start folders
for _, folderCfg := range cfg.Folders() {
if folderCfg.Paused {
folderCfg.CreateRoot()
continue
}
m.AddFolder(folderCfg)
m.StartFolder(folderCfg.ID)
}
mainService.Add(m)
// Start discovery
cachedDiscovery := discover.NewCachingMux()
mainService.Add(cachedDiscovery)
// Start connection management
connectionsService := connections.NewService(cfg, myID, m, tlsCfg, cachedDiscovery, bepProtocolName, tlsDefaultCommonName)
mainService.Add(connectionsService)
if cfg.Options().GlobalAnnEnabled {
for _, srv := range cfg.GlobalDiscoveryServers() {
l.Infoln("Using discovery server", srv)
gd, err := discover.NewGlobal(srv, cert, connectionsService)
if err != nil {
l.Warnln("Global discovery:", err)
continue
}
// Each global discovery server gets its results cached for five
// minutes, and is not asked again for a minute when it's returned
// unsuccessfully.
cachedDiscovery.Add(gd, 5*time.Minute, time.Minute)
}
}
if cfg.Options().LocalAnnEnabled {
// v4 broadcasts
bcd, err := discover.NewLocal(myID, fmt.Sprintf(":%d", cfg.Options().LocalAnnPort), connectionsService)
if err != nil {
l.Warnln("IPv4 local discovery:", err)
} else {
cachedDiscovery.Add(bcd, 0, 0)
}
// v6 multicasts
mcd, err := discover.NewLocal(myID, cfg.Options().LocalAnnMCAddr, connectionsService)
if err != nil {
l.Warnln("IPv6 local discovery:", err)
} else {
cachedDiscovery.Add(mcd, 0, 0)
}
}
// GUI
setupGUI(mainService, cfg, m, defaultSub, diskSub, cachedDiscovery, connectionsService, errors, systemLog, runtimeOptions)
if runtimeOptions.cpuProfile {
f, err := os.Create(fmt.Sprintf("cpu-%d.pprof", os.Getpid()))
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
}
for _, device := range cfg.Devices() {
if len(device.Name) > 0 {
l.Infof("Device %s is %q at %v", device.DeviceID, device.Name, device.Addresses)
}
}
// Candidate builds always run with usage reporting.
if opts := cfg.Options(); IsCandidate {
l.Infoln("Anonymous usage reporting is always enabled for candidate releases.")
opts.URAccepted = usageReportVersion
cfg.SetOptions(opts)
cfg.Save()
// Unique ID will be set and config saved below if necessary.
}
if opts := cfg.Options(); opts.URUniqueID == "" {
opts.URUniqueID = rand.String(8)
cfg.SetOptions(opts)
cfg.Save()
}
usageReportingSvc := newUsageReportingService(cfg, m, connectionsService)
mainService.Add(usageReportingSvc)
if opts := cfg.Options(); opts.RestartOnWakeup {
go standbyMonitor()
}
// Candidate builds should auto upgrade. Make sure the option is set,
// unless we are in a build where it's disabled or the STNOUPGRADE
// environment variable is set.
if IsCandidate && !upgrade.DisabledByCompilation && !noUpgradeFromEnv {
l.Infoln("Automatic upgrade is always enabled for candidate releases.")
if opts := cfg.Options(); opts.AutoUpgradeIntervalH == 0 || opts.AutoUpgradeIntervalH > 24 {
opts.AutoUpgradeIntervalH = 12
// Set the option into the config as well, as the auto upgrade
// loop expects to read a valid interval from there.
cfg.SetOptions(opts)
cfg.Save()
}
// We don't tweak the user's choice of upgrading to pre-releases or
// not, as otherwise they cannot step off the candidate channel.
}
if opts := cfg.Options(); opts.AutoUpgradeIntervalH > 0 {
if noUpgradeFromEnv {
l.Infof("No automatic upgrades; STNOUPGRADE environment variable defined.")
} else {
go autoUpgrade(cfg)
}
}
if isSuperUser() {
l.Warnln("Syncthing should not run as a privileged or system user. Please consider using a normal user account.")
}
events.Default.Log(events.StartupComplete, map[string]string{
"myID": myID.String(),
})
cleanConfigDirectory()
if cfg.Options().SetLowPriority {
if err := osutil.SetLowPriority(); err != nil {
l.Warnln("Failed to lower process priority:", err)
}
}
code := <-stop
mainService.Stop()
l.Infoln("Exiting")
if runtimeOptions.cpuProfile {
pprof.StopCPUProfile()
}
os.Exit(code)
}
func setupSignalHandling() {
// Exit cleanly with "restarting" code on SIGHUP.
restartSign := make(chan os.Signal, 1)
sigHup := syscall.Signal(1)
signal.Notify(restartSign, sigHup)
go func() {
<-restartSign
stop <- exitRestarting
}()
// Exit with "success" code (no restart) on INT/TERM
stopSign := make(chan os.Signal, 1)
sigTerm := syscall.Signal(15)
signal.Notify(stopSign, os.Interrupt, sigTerm)
go func() {
<-stopSign
stop <- exitSuccess
}()
}
func loadOrDefaultConfig() (*config.Wrapper, error) {
cfgFile := locations[locConfigFile]
cfg, err := config.Load(cfgFile, myID)
if err != nil {
cfg = defaultConfig(cfgFile)
}
return cfg, err
}
func loadConfigAtStartup() *config.Wrapper {
cfgFile := locations[locConfigFile]
cfg, err := config.Load(cfgFile, myID)
if os.IsNotExist(err) {
cfg = defaultConfig(cfgFile)
cfg.Save()
l.Infof("Default config saved. Edit %s to taste or use the GUI\n", cfg.ConfigPath())
} else if err == io.EOF {
l.Fatalln("Failed to load config: unexpected end of file. Truncated or empty configuration?")
} else if err != nil {
l.Fatalln("Failed to load config:", err)
}
if cfg.RawCopy().OriginalVersion != config.CurrentVersion {
//check config version
if cfg.RawCopy().OriginalVersion > config.CurrentVersion {
l.Fatalf("Current Configuration Version: %d, Loading Configuration Version: %d (Configuration Version Mismatch)", cfg.RawCopy().OriginalVersion, config.CurrentVersion)
//Config version is not compatible with installed version
os.Exit(exitError)
}
err = archiveAndSaveConfig(cfg)
if err != nil {
l.Fatalln("Config archive:", err)
}
}
return cfg
}
func archiveAndSaveConfig(cfg *config.Wrapper) error {
// Copy the existing config to an archive copy
archivePath := cfg.ConfigPath() + fmt.Sprintf(".v%d", cfg.RawCopy().OriginalVersion)
l.Infoln("Archiving a copy of old config file format at:", archivePath)
if err := copyFile(cfg.ConfigPath(), archivePath); err != nil {
return err
}
// Do a regular atomic config sve
return cfg.Save()
}
func copyFile(src, dst string) error {
bs, err := ioutil.ReadFile(src)