cmd/uraggregate: Handle malformed data, dont abort on error (fixes #7639) (#7659)

* Add connbench

* Refactor port fixup

* More cleanup

* touch for build

Co-authored-by: Jakob Borg <jakob@kastelo.net>

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+- package-ecosystem: gomod
+  directory: "/"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 10

.gitignore

@@ -19,3 +19,4 @@ deb
 /repos
 /proto/scripts/protoc-gen-gosyncthing
 /gui/next-gen-gui
+.idea

AUTHORS

@@ -82,7 +82,7 @@ deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.c
 Denis A. (dva) <denisva@gmail.com>
 Dennis Wilson (snnd) <dw@risu.io>
 dependabot-preview[bot] <dependabot-preview[bot]@users.noreply.github.com> <27856297+dependabot-preview[bot]@users.noreply.github.com>
-dependabot[bot] <dependabot[bot]@users.noreply.github.com>
+dependabot[bot] <dependabot[bot]@users.noreply.github.com> <49699333+dependabot[bot]@users.noreply.github.com>
 derekriemer <derek.riemer@colorado.edu>
 desbma <desbma@users.noreply.github.com>
 Dmitry Saveliev (dsaveliev) <d.e.saveliev@gmail.com>
@@ -100,6 +100,7 @@ Felix Lampe <mail@flampe.de>
 Felix Unterpaintner (bigbear2nd) <bigbear2nd@gmail.com>
 Francois-Xavier Gsell (zukoo) <fxgsell@gmail.com>
 Frank Isemann (fti7) <frank@isemann.name>
+Gahl Saraf <saraf.gahl@gmail.com>
 georgespatton <georgespatton@users.noreply.github.com>
 ghjklw <malo@jaffre.info>
 Gilli Sigurdsson (gillisig) <gilli@vx.is>
@@ -203,6 +204,7 @@ NoLooseEnds <jon.koslung@gmail.com>
 Oliver Freyermuth <o.freyermuth@googlemail.com>
 otbutz <tbutz@optitool.de>
 Otiel <Otiel@users.noreply.github.com>
+overkill <22098433+0verk1ll@users.noreply.github.com>
 Oyebanji Jacob Mayowa <oyebanji05@gmail.com>
 Pablo <pbaeyens31+github@gmail.com>
 Pascal Jungblut (pascalj) <github@pascalj.com> <mail@pascal-jungblut.com>

build.go

@@ -202,18 +202,6 @@ var targets = map[string]target{
 	},
 }
 
-// These are repos we need to clone to run "go generate"
-
-type dependencyRepo struct {
-	path   string
-	repo   string
-	commit string
-}
-
-var dependencyRepos = []dependencyRepo{
-	{path: "xdr", repo: "https://github.com/calmh/xdr.git", commit: "08e072f9cb16"},
-}
-
 func initTargets() {
 	all := targets["all"]
 	pkgs, _ := filepath.Glob("cmd/*")
@@ -871,28 +859,24 @@ func shouldRebuildAssets(target, srcdir string) bool {
 
 func proto() {
 	pv := protobufVersion()
-	dependencyRepos = append(dependencyRepos,
-		dependencyRepo{path: "protobuf", repo: "https://github.com/gogo/protobuf.git", commit: pv},
-	)
+	repo := "https://github.com/gogo/protobuf.git"
+	path := filepath.Join("repos", "protobuf")
 
 	runPrint(goCmd, "get", fmt.Sprintf("github.com/gogo/protobuf/protoc-gen-gogofast@%v", pv))
 	os.MkdirAll("repos", 0755)
-	for _, dep := range dependencyRepos {
-		path := filepath.Join("repos", dep.path)
-		if _, err := os.Stat(path); err != nil {
-			runPrintInDir("repos", "git", "clone", dep.repo, dep.path)
-		} else {
-			runPrintInDir(path, "git", "fetch")
-		}
-		runPrintInDir(path, "git", "checkout", dep.commit)
+
+	if _, err := os.Stat(path); err != nil {
+		runPrint("git", "clone", repo, path)
+	} else {
+		runPrintInDir(path, "git", "fetch")
 	}
+	runPrintInDir(path, "git", "checkout", pv)
+
 	runPrint(goCmd, "generate", "github.com/syncthing/syncthing/cmd/stdiscosrv")
 	runPrint(goCmd, "generate", "proto/generate.go")
 }
 
 func testmocks() {
-	runPrint(goCmd, "get", "golang.org/x/tools/cmd/goimports")
-	runPrint(goCmd, "get", "github.com/maxbrunsfeld/counterfeiter/v6")
 	args := []string{
 		"generate",
 		"github.com/syncthing/syncthing/lib/config",

cmd/strelaysrv/testutil/main.go

@@ -57,7 +57,7 @@ func main() {
 
 	if join {
 		log.Println("Creating client")
-		relay, err := client.NewClient(uri, []tls.Certificate{cert}, nil, 10*time.Second)
+		relay, err := client.NewClient(uri, []tls.Certificate{cert}, 10*time.Second)
 		if err != nil {
 			log.Fatal(err)
 		}

cmd/syncthing/cli/client.go

@@ -135,11 +135,11 @@ func (c *apiClient) Post(url, body string) (*http.Response, error) {
 }
 
 func checkResponse(response *http.Response) error {
-	if response.StatusCode == 404 {
+	if response.StatusCode == http.StatusNotFound {
 		return errors.New("invalid endpoint or API call")
-	} else if response.StatusCode == 403 {
+	} else if response.StatusCode == http.StatusUnauthorized {
 		return errors.New("invalid API key")
-	} else if response.StatusCode != 200 {
+	} else if response.StatusCode != http.StatusOK {
 		data, err := responseToBArray(response)
 		if err != nil {
 			return err

cmd/uraggregate/main.go

@@ -49,30 +49,30 @@ func runAggregation(db *sql.DB) {
 	log.Println("Aggregating VersionSummary data since", since)
 	rows, err := aggregateVersionSummary(db, since)
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")
 
 	log.Println("Aggregating UserMovement data")
 	rows, err = aggregateUserMovement(db)
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")
 
-	log.Println("Aggregating Performance data")
 	since = maxIndexedDay(db, "Performance")
+	log.Println("Aggregating Performance data since", since)
 	rows, err = aggregatePerformance(db, since)
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")
 
-	log.Println("Aggregating BlockStats data")
 	since = maxIndexedDay(db, "BlockStats")
+	log.Println("Aggregating BlockStats data since", since)
 	rows, err = aggregateBlockStats(db, since)
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")
 }
@@ -198,7 +198,8 @@ func aggregateUserMovement(db *sql.DB) (int64, error) {
 		Report->>'uniqueID'
 		FROM ReportsJson
 		WHERE
-			DATE_TRUNC('day', Received) < DATE_TRUNC('day', NOW())
+			Report->>'uniqueID' IS NOT NULL
+			AND DATE_TRUNC('day', Received) < DATE_TRUNC('day', NOW())
 			AND Report->>'version' like 'v_.%'
 		ORDER BY Day
 	`)

go.mod

@@ -1,57 +1,59 @@
 module github.com/syncthing/syncthing
 
 require (
-	github.com/AudriusButkevicius/pfilter v0.0.0-20210218141631-7468b85d810a
+	github.com/AudriusButkevicius/pfilter v0.0.0-20210510194644-fad42c10c5ac
 	github.com/AudriusButkevicius/recli v0.0.5
-	github.com/alecthomas/kong v0.2.12
+	github.com/alecthomas/kong v0.2.16
 	github.com/bkaradzic/go-lz4 v0.0.0-20160924222819-7224d8d8f27e
 	github.com/calmh/xdr v1.1.0
 	github.com/ccding/go-stun v0.1.3
-	github.com/certifi/gocertifi v0.0.0-20200922220541-2c3bb06c6054 // indirect
+	github.com/certifi/gocertifi v0.0.0-20210429200110-83314bf6d27c // indirect
 	github.com/chmduquesne/rollinghash v0.0.0-20180912150627-a60f8e7142b5
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
 	github.com/d4l3k/messagediff v1.2.1
 	github.com/dchest/siphash v1.2.2
 	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568
 	github.com/getsentry/raven-go v0.2.0
-	github.com/go-ldap/ldap/v3 v3.2.4
+	github.com/go-asn1-ber/asn1-ber v1.5.3 // indirect
+	github.com/go-ldap/ldap/v3 v3.3.0
 	github.com/gobwas/glob v0.2.3
-	github.com/gogo/protobuf v1.3.1
-	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
-	github.com/golang/protobuf v1.4.3
-	github.com/greatroar/blobloom v0.5.0
-	github.com/hashicorp/golang-lru v0.5.1
-	github.com/jackpal/gateway v1.0.6
+	github.com/gogo/protobuf v1.3.2
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/greatroar/blobloom v0.7.0
+	github.com/hashicorp/golang-lru v0.5.4
+	github.com/jackpal/gateway v1.0.7
 	github.com/jackpal/go-nat-pmp v1.0.2
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
-	github.com/lib/pq v1.8.0
+	github.com/klauspost/cpuid/v2 v2.0.6 // indirect
+	github.com/lib/pq v1.10.1
 	github.com/lucas-clemente/quic-go v0.19.3
-	github.com/maruel/panicparse v1.5.1
+	github.com/maruel/panicparse v1.6.1
 	github.com/mattn/go-isatty v0.0.12
-	github.com/maxbrunsfeld/counterfeiter/v6 v6.3.0 // indirect
-	github.com/minio/sha256-simd v0.1.1
+	github.com/maxbrunsfeld/counterfeiter/v6 v6.3.0
+	github.com/minio/sha256-simd v1.0.0
 	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	github.com/onsi/gomega v1.10.3 // indirect
-	github.com/oschwald/geoip2-golang v1.4.0
+	github.com/oschwald/geoip2-golang v1.5.0
 	github.com/petermattis/goid v0.0.0-20180202154549-b0b1615b78e5 // indirect
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.8.0
-	github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0
+	github.com/prometheus/client_golang v1.10.0
+	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/sasha-s/go-deadlock v0.2.0
-	github.com/shirou/gopsutil/v3 v3.20.11
+	github.com/shirou/gopsutil/v3 v3.21.4
 	github.com/syncthing/notify v0.0.0-20210308121556-f45149b04939
 	github.com/syndtr/goleveldb v1.0.1-0.20200815071216-d9e9293bd0f7
-	github.com/thejerf/suture/v4 v4.0.0
-	github.com/urfave/cli v1.22.4
+	github.com/thejerf/suture/v4 v4.0.1
+	github.com/urfave/cli v1.22.5
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
-	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
-	golang.org/x/net v0.0.0-20201031054903-ff519b6c9102
-	golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4
-	golang.org/x/text v0.3.4
-	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
-	golang.org/x/tools v0.1.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
+	golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b
+	golang.org/x/net v0.0.0-20210428140749-89ef3d95e781
+	golang.org/x/sys v0.0.0-20210426230700-d19ff857e887
+	golang.org/x/text v0.3.6
+	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
+	golang.org/x/tools v0.1.0
+	google.golang.org/protobuf v1.26.0
 )
 
 go 1.14

go.sum

@@ -7,8 +7,8 @@ dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBr
 dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
 dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
-github.com/AudriusButkevicius/pfilter v0.0.0-20210218141631-7468b85d810a h1:dUzIAgRmHLIUU0PT+OJ0X1WI5j1hlLbf+G420gUjIQg=
-github.com/AudriusButkevicius/pfilter v0.0.0-20210218141631-7468b85d810a/go.mod h1:1N0EEx/irz4B1qV17wW82TFbjQrE7oX316Cki6eDY0Q=
+github.com/AudriusButkevicius/pfilter v0.0.0-20210510194644-fad42c10c5ac h1:ua8XsAiW9JrUa97ioh+ZaZu2JeSMrhcQ2peBxSMrqSs=
+github.com/AudriusButkevicius/pfilter v0.0.0-20210510194644-fad42c10c5ac/go.mod h1:EEEtt5r8y0gGHlRFF2+cLx0WUy/rKHnjALmom5E0+74=
 github.com/AudriusButkevicius/recli v0.0.5 h1:xUa55PvWTHBm17T6RvjElRO3y5tALpdceH86vhzQ5wg=
 github.com/AudriusButkevicius/recli v0.0.5/go.mod h1:Q2E26yc6RvWWEz/TJ/goUp6yXvipYdJI096hpoaqsNs=
 github.com/Azure/go-ntlmssp v0.0.0-20200615164410-66371956d46c h1:/IBSNwUN8+eKzUzbJPqhK839ygXJ82sde8x3ogr6R28=
@@ -21,8 +21,8 @@ github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d h1:G0m3OIz70MZUW
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
 github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
-github.com/alecthomas/kong v0.2.12 h1:X3kkCOXGUNzLmiu+nQtoxWqj4U2a39MpSJR3QdQXOwI=
-github.com/alecthomas/kong v0.2.12/go.mod h1:kQOmtJgV+Lb4aj+I2LEn40cbtawdWJ9Y8QLq+lElKxE=
+github.com/alecthomas/kong v0.2.16 h1:F232CiYSn54Tnl1sJGTeHmx4vJDNLVP2b9yCVMOQwHQ=
+github.com/alecthomas/kong v0.2.16/go.mod h1:kQOmtJgV+Lb4aj+I2LEn40cbtawdWJ9Y8QLq+lElKxE=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@@ -50,14 +50,12 @@ github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7
 github.com/calmh/xdr v1.1.0 h1:U/Dd4CXNLoo8EiQ4ulJUXkgO1/EyQLgDKLgpY1SOoJE=
 github.com/calmh/xdr v1.1.0/go.mod h1:E8sz2ByAdXC8MbANf1LCRYzedSnnc+/sXXJs/PVqoeg=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
-github.com/ccding/go-stun v0.1.2 h1:1CZhjVwfyO/jGxk06a+0OSOGBWZu588kuZQQO4nihsw=
-github.com/ccding/go-stun v0.1.2/go.mod h1:3FK1bMar37f7jqVY7q/63k3OMX1c47pGCufzt3X0sYE=
 github.com/ccding/go-stun v0.1.3 h1:uEAFsxqPBuo4tvILfloEHUBO3b4BlEAMnx2PZdh54jE=
 github.com/ccding/go-stun v0.1.3/go.mod h1:cCZjJ1J3WFSJV6Wj8Y9Di8JMTsEXh6uv2eNmLzKaUeM=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/certifi/gocertifi v0.0.0-20200922220541-2c3bb06c6054 h1:uH66TXeswKn5PW5zdZ39xEwfS9an067BirqA+P4QaLI=
-github.com/certifi/gocertifi v0.0.0-20200922220541-2c3bb06c6054/go.mod h1:sGbDF6GwGcLpkNXPUTkMRoywsNa/ol15pxFe6ERfguA=
+github.com/certifi/gocertifi v0.0.0-20210429200110-83314bf6d27c h1:Tt0GPSnn14HRN/+db/WGBPDnUykj4b7EBNtBdHVQFiY=
+github.com/certifi/gocertifi v0.0.0-20210429200110-83314bf6d27c/go.mod h1:sGbDF6GwGcLpkNXPUTkMRoywsNa/ol15pxFe6ERfguA=
 github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cheekybits/genny v1.0.0 h1:uGGa4nei+j20rOSeDeP5Of12XVm7TGUd4dJA9RDitfE=
@@ -72,8 +70,9 @@ github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
 github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
+github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/d4l3k/messagediff v1.2.1 h1:ZcAIMYsUg0EAp9X+tt8/enBE/Q8Yd5kzPynLyKptt9U=
 github.com/d4l3k/messagediff v1.2.1/go.mod h1:Oozbb1TVXFac9FtSIxHBMnBCq2qeH/2KkEQxENCrlLo=
@@ -106,14 +105,15 @@ github.com/getsentry/raven-go v0.2.0 h1:no+xWJRb5ZI7eE8TWgIq1jLulQiIoLG0IfYxv5JY
 github.com/getsentry/raven-go v0.2.0/go.mod h1:KungGk8q33+aIAZUIVWZDr2OfAEBsO49PX4NzFV5kcQ=
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@@ -127,20 +127,23 @@ github.com/gogo/googleapis v1.1.0/go.mod h1:gf4bu3Q80BeJ6H1S1vYPm8/ELATdvryBaNFG
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@@ -150,8 +153,10 @@ github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrU
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@@ -160,8 +165,11 @@ github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ
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@@ -176,12 +184,13 @@ github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51
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@@ -198,8 +207,9 @@ github.com/hashicorp/go-uuid v1.0.1/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/b
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@@ -208,8 +218,8 @@ github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpO
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@@ -228,8 +238,11 @@ github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8
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@@ -238,8 +251,8 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
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@@ -252,10 +265,13 @@ github.com/marten-seemann/qtls v0.10.0 h1:ECsuYUKalRL240rRD4Ri33ISb7kAQ3qGDlrrl5
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@@ -265,11 +281,11 @@ github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0j
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@@ -321,10 +337,10 @@ github.com/openzipkin/zipkin-go v0.1.1/go.mod h1:NtoC/o8u3JlF1lSlyPNswIbeQH9bJTm
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@@ -347,8 +363,8 @@ github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod
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@@ -409,7 +427,6 @@ github.com/shurcooL/notifications v0.0.0-20181007000457-627ab5aea122/go.mod h1:b
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@@ -478,8 +499,8 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
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@@ -489,6 +510,7 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -510,6 +532,7 @@ golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR
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@@ -517,8 +540,9 @@ golang.org/x/net v0.0.0-20200813134508-3edf25e44fcc/go.mod h1:/O7V0waA8r7cgGh81R
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@@ -531,6 +555,7 @@ golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -560,29 +585,35 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -595,7 +626,9 @@ golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtn
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 golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -619,6 +652,7 @@ google.golang.org/genproto v0.0.0-20190306203927-b5d61aea6440/go.mod h1:VzzqZJRn
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190530194941-fb225487d101/go.mod h1:z3L6/3dTEVtUr6QSP8miRzeRqwQOioJ9I66odjN4I7s=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
@@ -630,14 +664,17 @@ google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ij
 google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.26.0 h1:2dTRdpdFEEhJYQD8EMLB61nnrzSCTbG38PhqdhvOltg=
 google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

gui/default/assets/lang/lang-it.json

@@ -25,7 +25,7 @@
     "An external command handles the versioning. It has to remove the file from the shared folder. If the path to the application contains spaces, it should be quoted.": "Il controllo versione è gestito da un comando esterno. Quest'ultimo deve rimuovere il file dalla cartella condivisa. Se il percorso dell'applicazione contiene spazi, deve essere indicato tra virgolette.",
     "Anonymous Usage Reporting": "Statistiche Anonime di Utilizzo",
     "Anonymous usage report format has changed. Would you like to move to the new format?": "Il formato delle statistiche anonime di utilizzo è cambiato. Vuoi passare al nuovo formato?",
-    "Are you sure you want to continue?": "Are you sure you want to continue?",
+    "Are you sure you want to continue?": "Sei sicuro di voler continuare?",
     "Are you sure you want to permanently delete all these files?": "Sei sicuro di voler eliminare definitivamente tutti questi file?",
     "Are you sure you want to remove device {%name%}?": "Sei sicuro di voler rimuovere il dispositivo {{name}}?",
     "Are you sure you want to remove folder {%label%}?": "Sei sicuro di voler rimuovere la cartella {{label}}?",
@@ -163,7 +163,7 @@
     "Ignored at": "Ignorato a",
     "Incoming Rate Limit (KiB/s)": "Limite Velocità in Ingresso (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Una configurazione non corretta potrebbe danneggiare il contenuto delle cartelle e rendere Syncthing inoperativo.",
-    "Introduced By": "Introdotto Da",
+    "Introduced By": "Introdotto da",
     "Introducer": "Introduttore",
     "Inversion of the given condition (i.e. do not exclude)": "Inversione della condizione indicata (ad es. non escludere)",
     "Keep Versions": "Versioni Mantenute",
@@ -378,7 +378,7 @@
     "Uptime": "Tempo di Funzionamento",
     "Usage reporting is always enabled for candidate releases.": "Le segnalazioni di utilizzo sono sempre abilitate le versioni candidate al rilascio.",
     "Use HTTPS for GUI": "Utilizza HTTPS per l'interfaccia grafica",
-    "Username/Password has not been set for the GUI authentication. Please consider setting it up.": "Utente/Password non sono stati impostati per l'autenticazione GUI. Considerane la configurazione.",
+    "Username/Password has not been set for the GUI authentication. Please consider setting it up.": "Utente/password non sono stati impostati per autenticazione GUI. Considerane la configurazione.",
     "Version": "Versione",
     "Versions": "Versioni",
     "Versions Path": "Percorso Cartella Versioni",
@@ -386,7 +386,7 @@
     "Waiting to Clean": "In attesa di Pulizia",
     "Waiting to Scan": "In attesa di Scansione",
     "Waiting to Sync": "In attesa di Sincronizzazione",
-    "Warning": "Warning",
+    "Warning": "Attenzione",
     "Warning, this path is a parent directory of an existing folder \"{%otherFolder%}\".": "Attenzione, questo percorso è una cartella superiore di una cartella esistente \"{{otherFolder}}\".",
     "Warning, this path is a parent directory of an existing folder \"{%otherFolderLabel%}\" ({%otherFolder%}).": "Attenzione, questo percorso è una cartella superiore di una cartella esistente \"{{otherFolderLabel}}\" ({{otherFolder}}).",
     "Warning, this path is a subdirectory of an existing folder \"{%otherFolder%}\".": "Attenzione, questo percorso è una sottocartella di una cartella esistente \"{{otherFolder}}\".",

gui/default/assets/lang/lang-sv.json

@@ -161,7 +161,7 @@
     "Ignored Devices": "Ignorerade enheter",
     "Ignored Folders": "Ignorerade mappar",
     "Ignored at": "Ignorerad vid",
-    "Incoming Rate Limit (KiB/s)": "Inkommande hastighetsbegränsning (KiB/s)",
+    "Incoming Rate Limit (KiB/s)": "Inkommande hastighetsgräns (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Inkorrekt konfiguration kan skada innehållet i mappen and få Syncthing att sluta fungera.",
     "Introduced By": "Introducerad av",
     "Introducer": "Introduktör",
@@ -211,7 +211,7 @@
     "Options": "Alternativ",
     "Out of Sync": "Osynkroniserad",
     "Out of Sync Items": "Osynkroniserade objekt",
-    "Outgoing Rate Limit (KiB/s)": "Utgående hastighetsbegränsning (KiB/s)",
+    "Outgoing Rate Limit (KiB/s)": "Utgående hastighetsgräns (KiB/s)",
     "Override Changes": "Åsidosätt förändringar",
     "Path": "Sökväg",
     "Path to the folder on the local computer. Will be created if it does not exist. The tilde character (~) can be used as a shortcut for": "Sökväg till mappen på din dator. Kommer att skapas om det inte finns. Tecknet tilde (~) kan användas som en genväg för",

gui/default/assets/lang/lang-zh-CN.json

@@ -1,6 +1,6 @@
 {
     "A device with that ID is already added.": "您已添加过相同 ID 的设备",
-    "A negative number of days doesn't make sense.": "负数天数没有意义。",
+    "A negative number of days doesn't make sense.": "天数不能为负。",
     "A new major version may not be compatible with previous versions.": "重大更新可能与之前的版本之间无法兼容",
     "API Key": "API Key",
     "About": "关于",
@@ -18,14 +18,14 @@
     "Advanced": "高级",
     "Advanced Configuration": "高级配置",
     "All Data": "所有数据",
-    "All folders shared with this device must be protected by a password, such that all sent data is unreadable without the given password.": "All folders shared with this device must be protected by a password, such that all sent data is unreadable without the given password.",
+    "All folders shared with this device must be protected by a password, such that all sent data is unreadable without the given password.": "与此设备共享的所有文件夹都必须有密码保护，这样所有发送的数据在没有密码的情况下是不可读的。",
     "Allow Anonymous Usage Reporting?": "允许匿名使用报告?",
     "Allowed Networks": "允许的网络",
     "Alphabetic": "字母顺序",
     "An external command handles the versioning. It has to remove the file from the shared folder. If the path to the application contains spaces, it should be quoted.": "外部命令接管了版本控制。该外部命令必须自行从共享文件夹中删除该文件。如果此应用程序的路径包含空格，应该用半角引号括起来。",
     "Anonymous Usage Reporting": "匿名使用报告",
     "Anonymous usage report format has changed. Would you like to move to the new format?": "匿名使用情况的报告格式已经变更。是否要迁移到新的格式？",
-    "Are you sure you want to continue?": "Are you sure you want to continue?",
+    "Are you sure you want to continue?": "您确定要继续吗?",
     "Are you sure you want to permanently delete all these files?": "确认要永久删除这些文件吗？",
     "Are you sure you want to remove device {%name%}?": "您确定要移除设备 {{name}} 吗？",
     "Are you sure you want to remove folder {%label%}?": "您确定要移除文件夹 {{label}} 吗？",
@@ -55,23 +55,23 @@
     "Connection Type": "连接类型",
     "Connections": "连接",
     "Continuously watching for changes is now available within Syncthing. This will detect changes on disk and issue a scan on only the modified paths. The benefits are that changes are propagated quicker and that less full scans are required.": "Syncthing 现在可以持续监视更改了。这将检测磁盘上的更改，然后对有修改的路径发起扫描。这样的好处是更改可以更快地传播，且需要的完整扫描会更少。",
-    "Copied from elsewhere": "从其他设备复制",
+    "Copied from elsewhere": "从其它设备复制",
     "Copied from original": "从源复制",
     "Copyright © 2014-2019 the following Contributors:": "版权所有 © 2014-2019 以下贡献者：",
     "Creating ignore patterns, overwriting an existing file at {%path%}.": "正在创建忽略模式，覆盖位于 {{path}} 的已有文件。",
     "Currently Shared With Devices": "当前设备已共享",
     "Danger!": "危险！",
     "Debugging Facilities": "调试功能",
-    "Default Configuration": "Default Configuration",
-    "Default Device": "Default Device",
-    "Default Folder": "Default Folder",
+    "Default Configuration": "默认配置",
+    "Default Device": "默认设备",
+    "Default Folder": "默认文件夹",
     "Default Folder Path": "默认文件夹路径",
-    "Defaults": "Defaults",
-    "Delete Unexpected Items": "Delete Unexpected Items",
+    "Defaults": "默认值",
+    "Delete Unexpected Items": "删除特殊项目",
     "Deleted": "已删除",
     "Deselect All": "取消全选",
     "Deselect devices to stop sharing this folder with.": "反选设备以停止共享此文件夹",
-    "Deselect folders to stop sharing with this device.": "Deselect folders to stop sharing with this device.",
+    "Deselect folders to stop sharing with this device.": "取消选择文件夹以停止与此设备共享。",
     "Device": "设备",
     "Device \"{%name%}\" ({%device%} at {%address%}) wants to connect. Add new device?": "设备 \"{{name}}\"（位于 {{address}} 的 {{device}}）请求连接。是否添加新设备？",
     "Device ID": "设备 ID",
@@ -102,9 +102,9 @@
     "Downloading": "下载中",
     "Edit": "选项",
     "Edit Device": "编辑设备",
-    "Edit Device Defaults": "Edit Device Defaults",
+    "Edit Device Defaults": "编辑设备默认值",
     "Edit Folder": "编辑文件夹",
-    "Edit Folder Defaults": "Edit Folder Defaults",
+    "Edit Folder Defaults": "编辑文件夹默认值",
     "Editing {%path%}.": "正在编辑 {{path}}。",
     "Enable Crash Reporting": "启用自动发送崩溃报告",
     "Enable NAT traversal": "启用 NAT 遍历",
@@ -134,11 +134,11 @@
     "Folder Label": "文件夹标签",
     "Folder Path": "文件夹路径",
     "Folder Type": "文件夹类型",
-    "Folder type \"{%receiveEncrypted%}\" can only be set when adding a new folder.": "Folder type \"{{receiveEncrypted}}\" can only be set when adding a new folder.",
-    "Folder type \"{%receiveEncrypted%}\" cannot be changed after adding the folder. You need to remove the folder, delete or decrypt the data on disk, and add the folder again.": "Folder type \"{{receiveEncrypted}}\" cannot be changed after adding the folder. You need to remove the folder, delete or decrypt the data on disk, and add the folder again.",
+    "Folder type \"{%receiveEncrypted%}\" can only be set when adding a new folder.": "只能在添加新文件夹时设置文件夹类型{{receiveEncrypted}}”",
+    "Folder type \"{%receiveEncrypted%}\" cannot be changed after adding the folder. You need to remove the folder, delete or decrypt the data on disk, and add the folder again.": "添加文件夹后，无法更改文件夹类型“ {{receiveEncrypted}}”。您需要删除该文件夹，删除或解密磁盘上的数据，然后再次添加该文件夹。",
     "Folders": "文件夹",
     "For the following folders an error occurred while starting to watch for changes. It will be retried every minute, so the errors might go away soon. If they persist, try to fix the underlying issue and ask for help if you can't.": "开始监视下列文件夹时发生错误。由于每分钟都会重试，所以错误可能很快就消失。如果它们仍存在，请试着修复潜在问题，如不会则请求帮助。",
-    "Full Rescan Interval (s)": "完整扫描间隔",
+    "Full Rescan Interval (s)": "完整扫描间隔（秒）",
     "GUI": "图形用户界面",
     "GUI Authentication Password": "图形管理界面密码",
     "GUI Authentication User": "图形管理界面用户名",
@@ -153,7 +153,7 @@
     "Help": "帮助",
     "Home page": "主页",
     "However, your current settings indicate you might not want it enabled. We have disabled automatic crash reporting for you.": "我们已经为您关闭了自动崩溃报告发送功能，因为您当前的设置显示您可能并不想启用该功能。",
-    "If untrusted, enter encryption password": "If untrusted, enter encryption password",
+    "If untrusted, enter encryption password": "如想更安全，请输入加密密码",
     "If you want to prevent other users on this computer from accessing Syncthing and through it your files, consider setting up authentication.": "如果要阻止此计算机上的其他用户访问Syncthing并通过它访问文件，请考虑设置身份验证。",
     "Ignore": "忽略",
     "Ignore Patterns": "忽略模式",
@@ -165,7 +165,7 @@
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "错误的配置可能损坏您文件夹内的内容，使得 Syncthing 无法工作。",
     "Introduced By": "介绍自",
     "Introducer": "作为中介",
-    "Inversion of the given condition (i.e. do not exclude)": "对本条件取反（例如：不要排除某项）",
+    "Inversion of the given condition (i.e. do not exclude)": "反转本条件（即：不排除）",
     "Keep Versions": "保留版本数量",
     "LDAP": "LDAP",
     "Largest First": "大文件优先",
@@ -202,7 +202,7 @@
     "No File Versioning": "不启用版本控制",
     "No files will be deleted as a result of this operation.": "此操作结果不会删除任何文件。",
     "No upgrades": "无更新",
-    "Not shared": "Not shared",
+    "Not shared": "不共享",
     "Notice": "提示",
     "OK": "确定",
     "Off": "关闭",
@@ -236,15 +236,15 @@
     "Preview Usage Report": "预览使用报告",
     "Quick guide to supported patterns": "支持的通配符的简单教程：",
     "Random": "随机顺序",
-    "Receive Encrypted": "Receive Encrypted",
+    "Receive Encrypted": "加密接收",
     "Receive Only": "仅接收",
-    "Received data is already encrypted": "Received data is already encrypted",
+    "Received data is already encrypted": "已加密接收到的数据",
     "Recent Changes": "最近更改",
     "Reduced by ignore patterns": "已由忽略模式缩减",
     "Release Notes": "发布说明",
     "Release candidates contain the latest features and fixes. They are similar to the traditional bi-weekly Syncthing releases.": "发布候选版包含最新的特性和修复。它们跟传统的 Syncthing 双周发布版类似。",
     "Remote Devices": "远程设备",
-    "Remote GUI": "Remote GUI",
+    "Remote GUI": "远程GUI",
     "Remove": "移除",
     "Remove Device": "移除设备",
     "Remove Folder": "移除文件夹",
@@ -268,7 +268,7 @@
     "Select All": "全选",
     "Select a version": "选择版本",
     "Select additional devices to share this folder with.": "选择其他共享此文件夹的设备",
-    "Select additional folders to share with this device.": "Select additional folders to share with this device.",
+    "Select additional folders to share with this device.": "选择要与此设备共享的其它文件夹。",
     "Select latest version": "选择最新的版本",
     "Select oldest version": "选择最旧的版本",
     "Select the folders to share with this device.": "选择与该设备共享的文件夹。",
@@ -279,7 +279,7 @@
     "Share Folder": "共享文件夹",
     "Share Folders With Device": "将指定文件夹共享给设备",
     "Share this folder?": "是否共享该文件夹？",
-    "Shared Folders": "Shared Folders",
+    "Shared Folders": "共享文件夹",
     "Shared With": "共享给",
     "Sharing": "共享",
     "Show ID": "显示 ID",
@@ -302,7 +302,7 @@
     "Start Browser": "启动浏览器",
     "Statistics": "统计",
     "Stopped": "已停止",
-    "Stores and syncs only encrypted data. Folders on all connected devices need to be set up with the same password or be of type \"{%receiveEncrypted%}\" too.": "Stores and syncs only encrypted data. Folders on all connected devices need to be set up with the same password or be of type \"{{receiveEncrypted}}\" too.",
+    "Stores and syncs only encrypted data. Folders on all connected devices need to be set up with the same password or be of type \"{%receiveEncrypted%}\" too.": "仅存储和同步加密的数据。所有连接的设备上的文件夹也需要使用相同的密码设置，或者也必须设置为“ {{receiveEncrypted}}”类型。",
     "Support": "支持",
     "Support Bundle": "支持捆绑包",
     "Sync Protocol Listen Addresses": "协议监听地址",
@@ -328,13 +328,13 @@
     "The entered device ID does not look valid. It should be a 52 or 56 character string consisting of letters and numbers, with spaces and dashes being optional.": "输入的设备 ID 似乎无效。设备 ID 包含字母和数字，长度为 52 或 56，空格和横线不计在内。",
     "The folder ID cannot be blank.": "文件夹 ID 不能为空。",
     "The folder ID must be unique.": "文件夹 ID 不得重复。",
-    "The folder content on other devices will be overwritten to become identical with this device. Files not present here will be deleted on other devices.": "The folder content on other devices will be overwritten to become identical with this device. Files not present here will be deleted on other devices.",
-    "The folder content on this device will be overwritten to become identical with other devices. Files newly added here will be deleted.": "The folder content on this device will be overwritten to become identical with other devices. Files newly added here will be deleted.",
+    "The folder content on other devices will be overwritten to become identical with this device. Files not present here will be deleted on other devices.": "其它设备上的文件夹内容将被覆盖，以与此设备相同。此处不存在的文件将在其他设备上删除。",
+    "The folder content on this device will be overwritten to become identical with other devices. Files newly added here will be deleted.": "该设备上的文件夹内容将被覆盖，使其与其他设备相同。在此处新添加的文件将被删除。",
     "The folder path cannot be blank.": "文件夹路径不能为空。",
     "The following intervals are used: for the first hour a version is kept every 30 seconds, for the first day a version is kept every hour, for the first 30 days a version is kept every day, until the maximum age a version is kept every week.": "保留的历史版本会遵循以下条件：最近一小时内的历史版本，更新间隔小于三十秒的仅保留一份。最近一天内的历史版本，更新间隔小于一小时的仅保留一份。最近一个月内的历史版本，更新间隔小于一天的仅保留一份。距离现在超过一个月且小于最长保留时间的，更新间隔小于一周的仅保留一份。",
     "The following items could not be synchronized.": "下列项目无法被同步。",
     "The following items were changed locally.": "下列项目存在本地更改。",
-    "The following unexpected items were found.": "The following unexpected items were found.",
+    "The following unexpected items were found.": "找到了以下特殊项。",
     "The interval must be a positive number of seconds.": "间隔必须为正数秒。",
     "The interval, in seconds, for running cleanup in the versions directory. Zero to disable periodic cleaning.": "在版本目录中运行清理的间隔（秒）。0表示禁用定期清除。",
     "The maximum age must be a number and cannot be blank.": "最长保留时间必须为数字，且不能为空。",
@@ -347,7 +347,7 @@
     "The rate limit must be a non-negative number (0: no limit)": "传输速度限制为非负整数（0 表示不限制）",
     "The rescan interval must be a non-negative number of seconds.": "扫描间隔单位为秒，且不能为负数。",
     "There are no devices to share this folder with.": "没有设备共享此文件夹",
-    "There are no folders to share with this device.": "There are no folders to share with this device.",
+    "There are no folders to share with this device.": "没有文件夹与此设备共享。",
     "They are retried automatically and will be synced when the error is resolved.": "系统将会自动重试，当错误被解决时，它们将会被同步。",
     "This Device": "当前设备",
     "This can easily give hackers access to read and change any files on your computer.": "这会让骇客能够轻而易举地访问及修改您的文件。",
@@ -361,14 +361,14 @@
     "Unavailable": "无效",
     "Unavailable/Disabled by administrator or maintainer": "无效/禁用（由管理员或维护者）",
     "Undecided (will prompt)": "待定（将提示）",
-    "Unexpected Items": "Unexpected Items",
-    "Unexpected items have been found in this folder.": "Unexpected items have been found in this folder.",
+    "Unexpected Items": "特殊项目",
+    "Unexpected items have been found in this folder.": "在此文件夹中发现了特殊项目",
     "Unignore": "解除忽略",
     "Unknown": "未知",
-    "Unshared": "未共享",
-    "Unshared Devices": "未共享设备",
-    "Unshared Folders": "Unshared Folders",
-    "Untrusted": "Untrusted",
+    "Unshared": "非共享",
+    "Unshared Devices": "非共享设备",
+    "Unshared Folders": "非共享文件夹",
+    "Untrusted": "不可信的",
     "Up to Date": "同步完成",
     "Updated": "已更新",
     "Upgrade": "更新",
@@ -386,7 +386,7 @@
     "Waiting to Clean": "等待清除",
     "Waiting to Scan": "等待扫描",
     "Waiting to Sync": "等待同步",
-    "Warning": "Warning",
+    "Warning": "警告",
     "Warning, this path is a parent directory of an existing folder \"{%otherFolder%}\".": "警告，该路径是已有文件夹\"{{otherFolder}}\"的上级目录。",
     "Warning, this path is a parent directory of an existing folder \"{%otherFolderLabel%}\" ({%otherFolder%}).": "警告，该路径是已有文件夹\"{{otherFolderLabel}}\" ({{otherFolder}})的上级目录。",
     "Warning, this path is a subdirectory of an existing folder \"{%otherFolder%}\".": "警告，该路径是已有文件夹\"{{otherFolder}}\"的下级目录。",
@@ -405,7 +405,7 @@
     "You have no ignored folders.": "你没有已忽略的文件夹。",
     "You have unsaved changes. Do you really want to discard them?": "你有未保存的更改。你真的要丢弃它们吗？",
     "You must keep at least one version.": "您必须保留至少一个版本。",
-    "You should never add or change anything locally in a \"{%receiveEncrypted%}\" folder.": "You should never add or change anything locally in a \"{{receiveEncrypted}}\" folder.",
+    "You should never add or change anything locally in a \"{%receiveEncrypted%}\" folder.": "您绝对不应在“ {{receiveEncrypted}}”文件夹中添加或更改任何本地内容。",
     "days": "天",
     "directories": "目录",
     "files": "文件",
@@ -414,5 +414,5 @@
     "seconds": "秒",
     "{%device%} wants to share folder \"{%folder%}\".": "{{device}} 想将 “{{folder}}” 文件夹共享给您。",
     "{%device%} wants to share folder \"{%folderlabel%}\" ({%folder%}).": "{{device}} 想要共享 \"{{folderlabel}}\" ({{folder}}) 文件夹给您。",
-    "{%reintroducer%} might reintroduce this device.": "{{reintroducer}} might reintroduce this device."
+    "{%reintroducer%} might reintroduce this device.": "{{reintroducer}}可能会重新引入此设备。"
 }

gui/default/index.html

@@ -560,7 +560,7 @@
                     <button ng-if="folder.paused" type="button" class="btn btn-sm btn-default" ng-click="setFolderPause(folder.id, false)">
                       <span class="fas fa-play"></span>&nbsp;<span translate>Resume</span>
                     </button>
-                    <button type="button" class="btn btn-default btn-sm" ng-click="restoreVersions.show(folder.id)" ng-if="folder.versioning.type && folder.versioning.type != 'external'">
+                    <button type="button" class="btn btn-default btn-sm" ng-click="restoreVersions.show(folder.id)" ng-if="folder.versioning.type && folder.versioning.type != 'external'" ng-disabled="folder.paused">
                       <span class="fas fa-undo"></span>&nbsp;<span translate>Versions</span>
                     </button>
                     <button type="button" class="btn btn-sm btn-default" ng-click="rescanFolder(folder.id)" ng-disabled="['idle', 'stopped', 'unshared', 'outofsync', 'faileditems', 'localadditions'].indexOf(folderStatus(folder)) < 0">
@@ -713,7 +713,7 @@
                     <span ng-switch-when="disconnected"><span class="hidden-xs" translate>Disconnected</span><span class="visible-xs" aria-label="{{'Disconnected' | translate}}"><i class="fas fa-fw fa-power-off"></i></span></span>
                     <span ng-switch-when="unused-disconnected"><span class="hidden-xs" translate>Disconnected (Unused)</span><span class="visible-xs" aria-label="{{'Disconnected (Unused)' | translate}}"><i class="fas fa-fw fa-unlink"></i></span></span>
                   </span>
-                  <span>{{deviceName(deviceCfg)}}</span>
+                  <div class="panel-title-text">{{deviceName(deviceCfg)}}</div>
                 </h4>
               </button>
               <div id="device-{{$index}}" class="panel-collapse collapse">

gui/default/syncthing/core/aboutModalView.html

@@ -19,7 +19,7 @@
     <h4 class="text-center" translate>The Syncthing Authors</h4>
     <div class="row">
       <div class="col-md-12" id="contributor-list">
-Jakob Borg, Audrius Butkevicius, Jesse Lucas, Simon Frei, Alexander Graf, Alexandre Viau, Anderson Mesquita, André Colomb, Antony Male, Ben Schulz, Caleb Callaway, Daniel Harte, Evgeny Kuznetsov, Lars K.W. Gohlke, Lode Hoste, Michael Ploujnikov, Nate Morrison, Philippe Schommers, Ryan Sullivan, Sergey Mishin, Stefan Tatschner, Tomasz Wilczyński, Wulf Weich, dependabot-preview[bot], greatroar, Aaron Bieber, Adam Piggott, Adel Qalieh, Alan Pope, Alberto Donato, Alessandro G., Alex Lindeman, Alex Xu, Aman Gupta, Andrew Dunham, Andrew Rabert, Andrey D, Anjan Momi, Antoine Lamielle, Aranjedeath, Arkadiusz Tymiński, Arthur Axel fREW Schmidt, Artur Zubilewicz, Aurélien Rainone, BAHADIR YILMAZ, Bart De Vries, Ben Curthoys, Ben Shepherd, Ben Sidhom, Benedikt Heine, Benedikt Morbach, Benno Fünfstück, Benny Ng, Boqin Qin, Boris Rybalkin, Brandon Philips, Brendan Long, Brian R. Becker, Carsten Hagemann, Cathryne Linenweaver, Cedric Staniewski, Choongkyu, Chris Howie, Chris Joel, Chris Tonkinson, Christian Prescott, Colin Kennedy, Cromefire_, Cyprien Devillez, Dale Visser, Dan, Daniel Bergmann, Daniel Martí, Darshil Chanpura, David Rimmer, Denis A., Dennis Wilson, Dmitry Saveliev, Domenic Horner, Dominik Heidler, Elias Jarlebring, Elliot Huffman, Emil Hessman, Eric Lesiuta, Erik Meitner, Federico Castagnini, Felix Ableitner, Felix Lampe, Felix Unterpaintner, Francois-Xavier Gsell, Frank Isemann, Gilli Sigurdsson, Gleb Sinyavskiy, Graham Miln, Han Boetes, HansK-p, Harrison Jones, Heiko Zuerker, Hugo Locurcio, Iain Barnett, Ian Johnson, Ilya Brin, Iskander Sharipov, Jaakko Hannikainen, Jacek Szafarkiewicz, Jack Croft, Jacob, Jake Peterson, James Patterson, Jaroslav Lichtblau, Jaroslav Malec, Jaya Chithra, Jens Diemer, Jerry Jacobs, Jochen Voss, Johan Andersson, Johan Vromans, John Rinehart, Jonas Thelemann, Jonathan, Jonathan Cross, Jonta, Jose Manuel Delicado, Jörg Thalheim, Jędrzej Kula, Kalle Laine, Karol Różycki, Keith Turner, Kelong Cong, Ken'ichi Kamada, Kevin Allen, Kevin Bushiri, Kevin White, Jr., Kurt Fitzner, Lars Lehtonen, Laurent Arnoud, Laurent Etiemble, Leo Arias, Liu Siyuan, Lord Landon Agahnim, Lukas Lihotzki, Majed Abdulaziz, Marc Laporte, Marc Pujol, Marcin Dziadus, Marcus Legendre, Mario Majila, Mark Pulford, Mateusz Naściszewski, Mateusz Ż, Matic Potočnik, Matt Burke, Matt Robenolt, Matteo Ruina, Maurizio Tomasi, Max Schulze, MaximAL, Maxime Thirouin, MichaIng, Michael Jephcote, Michael Rienstra, Michael Tilli, Mike Boone, MikeLund, MikolajTwarog, Mingxuan Lin, Nicholas Rishel, Nico Stapelbroek, Nicolas Braud-Santoni, Nicolas Perraut, Niels Peter Roest, Nils Jakobi, NinoM4ster, Nitroretro, NoLooseEnds, Oliver Freyermuth, Otiel, Oyebanji Jacob Mayowa, Pablo, Pascal Jungblut, Paul Brit, Pawel Palenica, Paweł Rozlach, Peter Badida, Peter Dave Hello, Peter Hoeg, Peter Marquardt, Phani Rithvij, Phil Davis, Phill Luby, Pier Paolo Ramon, Piotr Bejda, Pramodh KP, Quentin Hibon, Rahmi Pruitt, Richard Hartmann, Robert Carosi, Roberto Santalla, Robin Schoonover, Roman Zaynetdinov, Ross Smith II, Ruslan Yevdokymov, Sacheendra Talluri, Scott Klupfel, Shaarad Dalvi, Simon Mwepu, Sly_tom_cat, Stefan Kuntz, Steven Eckhoff, Suhas Gundimeda, Taylor Khan, Thomas Hipp, Tim Abell, Tim Howes, Tobias Klauser, Tobias Nygren, Tobias Tom, Tom Jakubowski, Tommy Thorn, Tully Robinson, Tyler Brazier, Tyler Kropp, Unrud, Veeti Paananen, Victor Buinsky, Vil Brekin, Vladimir Rusinov, William A. Kennington III, Xavier O., Yannic A., andresvia, andyleap, boomsquared, bt90, chenrui, chucic, deepsource-autofix[bot], dependabot[bot], derekriemer, desbma, georgespatton, ghjklw, janost, jaseg, jelle van der Waa, klemens, marco-m, mclang, mv1005, otbutz, perewa, rubenbe, wangguoliang, wouter bolsterlee, xarx00, xjtdy888, 佛跳墙
+Jakob Borg, Audrius Butkevicius, Jesse Lucas, Simon Frei, Alexander Graf, Alexandre Viau, Anderson Mesquita, André Colomb, Antony Male, Ben Schulz, Caleb Callaway, Daniel Harte, Evgeny Kuznetsov, Lars K.W. Gohlke, Lode Hoste, Michael Ploujnikov, Nate Morrison, Philippe Schommers, Ryan Sullivan, Sergey Mishin, Stefan Tatschner, Tomasz Wilczyński, Wulf Weich, dependabot-preview[bot], greatroar, Aaron Bieber, Adam Piggott, Adel Qalieh, Alan Pope, Alberto Donato, Alessandro G., Alex Lindeman, Alex Xu, Aman Gupta, Andrew Dunham, Andrew Rabert, Andrey D, Anjan Momi, Antoine Lamielle, Aranjedeath, Arkadiusz Tymiński, Arthur Axel fREW Schmidt, Artur Zubilewicz, Aurélien Rainone, BAHADIR YILMAZ, Bart De Vries, Ben Curthoys, Ben Shepherd, Ben Sidhom, Benedikt Heine, Benedikt Morbach, Benno Fünfstück, Benny Ng, Boqin Qin, Boris Rybalkin, Brandon Philips, Brendan Long, Brian R. Becker, Carsten Hagemann, Cathryne Linenweaver, Cedric Staniewski, Choongkyu, Chris Howie, Chris Joel, Chris Tonkinson, Christian Prescott, Colin Kennedy, Cromefire_, Cyprien Devillez, Dale Visser, Dan, Daniel Bergmann, Daniel Martí, Darshil Chanpura, David Rimmer, Denis A., Dennis Wilson, Dmitry Saveliev, Domenic Horner, Dominik Heidler, Elias Jarlebring, Elliot Huffman, Emil Hessman, Eric Lesiuta, Erik Meitner, Federico Castagnini, Felix Ableitner, Felix Lampe, Felix Unterpaintner, Francois-Xavier Gsell, Frank Isemann, Gahl Saraf, Gilli Sigurdsson, Gleb Sinyavskiy, Graham Miln, Han Boetes, HansK-p, Harrison Jones, Heiko Zuerker, Hugo Locurcio, Iain Barnett, Ian Johnson, Ilya Brin, Iskander Sharipov, Jaakko Hannikainen, Jacek Szafarkiewicz, Jack Croft, Jacob, Jake Peterson, James Patterson, Jaroslav Lichtblau, Jaroslav Malec, Jaya Chithra, Jens Diemer, Jerry Jacobs, Jochen Voss, Johan Andersson, Johan Vromans, John Rinehart, Jonas Thelemann, Jonathan, Jonathan Cross, Jonta, Jose Manuel Delicado, Jörg Thalheim, Jędrzej Kula, Kalle Laine, Karol Różycki, Keith Turner, Kelong Cong, Ken'ichi Kamada, Kevin Allen, Kevin Bushiri, Kevin White, Jr., Kurt Fitzner, Lars Lehtonen, Laurent Arnoud, Laurent Etiemble, Leo Arias, Liu Siyuan, Lord Landon Agahnim, Lukas Lihotzki, Majed Abdulaziz, Marc Laporte, Marc Pujol, Marcin Dziadus, Marcus Legendre, Mario Majila, Mark Pulford, Mateusz Naściszewski, Mateusz Ż, Matic Potočnik, Matt Burke, Matt Robenolt, Matteo Ruina, Maurizio Tomasi, Max Schulze, MaximAL, Maxime Thirouin, MichaIng, Michael Jephcote, Michael Rienstra, Michael Tilli, Mike Boone, MikeLund, MikolajTwarog, Mingxuan Lin, Nicholas Rishel, Nico Stapelbroek, Nicolas Braud-Santoni, Nicolas Perraut, Niels Peter Roest, Nils Jakobi, NinoM4ster, Nitroretro, NoLooseEnds, Oliver Freyermuth, Otiel, Oyebanji Jacob Mayowa, Pablo, Pascal Jungblut, Paul Brit, Pawel Palenica, Paweł Rozlach, Peter Badida, Peter Dave Hello, Peter Hoeg, Peter Marquardt, Phani Rithvij, Phil Davis, Phill Luby, Pier Paolo Ramon, Piotr Bejda, Pramodh KP, Quentin Hibon, Rahmi Pruitt, Richard Hartmann, Robert Carosi, Roberto Santalla, Robin Schoonover, Roman Zaynetdinov, Ross Smith II, Ruslan Yevdokymov, Sacheendra Talluri, Scott Klupfel, Shaarad Dalvi, Simon Mwepu, Sly_tom_cat, Stefan Kuntz, Steven Eckhoff, Suhas Gundimeda, Taylor Khan, Thomas Hipp, Tim Abell, Tim Howes, Tobias Klauser, Tobias Nygren, Tobias Tom, Tom Jakubowski, Tommy Thorn, Tully Robinson, Tyler Brazier, Tyler Kropp, Unrud, Veeti Paananen, Victor Buinsky, Vil Brekin, Vladimir Rusinov, William A. Kennington III, Xavier O., Yannic A., andresvia, andyleap, boomsquared, bt90, chenrui, chucic, deepsource-autofix[bot], dependabot[bot], derekriemer, desbma, georgespatton, ghjklw, janost, jaseg, jelle van der Waa, klemens, marco-m, mclang, mv1005, otbutz, overkill, perewa, rubenbe, wangguoliang, wouter bolsterlee, xarx00, xjtdy888, 佛跳墙
     </div>
     </div>
     <hr />

gui/default/syncthing/core/syncthingController.js

@@ -42,7 +42,7 @@ angular.module('syncthing.core')
         $scope.pendingFolders = {};
         $scope.progress = {};
         $scope.version = {};
-        $scope.needed = {}
+        $scope.needed = {};
         $scope.neededFolder = '';
         $scope.failed = {};
         $scope.localChanged = {};
@@ -673,7 +673,7 @@ angular.module('syncthing.core')
                 console.log("refreshNeed", $scope.neededFolder, data);
                 parseNeeded(data);
             }).error($scope.emitHTTPError);
-        }
+        };
 
         function needAction(file) {
             var fDelete = 4096;
@@ -1010,7 +1010,7 @@ angular.module('syncthing.core')
                 if (days > 31) {
                     return '> 1 month';
                 }
-                res.push('' + days + 'd')
+                res.push('' + days + 'd');
                 seconds = seconds % 86400;
             }
 
@@ -1018,7 +1018,7 @@ angular.module('syncthing.core')
             var hours = 0;
             if (seconds > 3600) {
                 hours = Math.floor(seconds / 3600);
-                res.push('' + hours + 'h')
+                res.push('' + hours + 'h');
                 seconds = seconds % 3600;
             }
 
@@ -1759,7 +1759,7 @@ angular.module('syncthing.core')
             };
             $scope.config.devices = deviceList($scope.devices);
             $scope.saveConfig();
-        }
+        };
 
         $scope.isAtleastOneDevicePausedStateSetTo = function (pause) {
             for (var id in $scope.devices) {
@@ -1768,8 +1768,8 @@ angular.module('syncthing.core')
                 }
             }
 
-            return false
-        }
+            return false;
+        };
 
         $scope.errorList = function () {
             if (!$scope.errors) {
@@ -2779,7 +2779,7 @@ angular.module('syncthing.core')
             var time = $filter('date')(status.when, "HH:mm:ss")
             var err = status.error.replace(/.+: /, '');
             return err + " (" + time + ")";
-        }
+        };
 
         $scope.setCrashReportingEnabled = function (enabled) {
             $scope.config.options.crashReportingEnabled = enabled;
@@ -2791,7 +2791,7 @@ angular.module('syncthing.core')
                 (address.indexOf('/') == 0 ||
                     address.indexOf('unix://') == 0 ||
                     address.indexOf('unixs://') == 0);
-        }
+        };
     })
     .directive('shareTemplate', function () {
         return {

lib/api/api.go

@@ -32,7 +32,7 @@ import (
 	"unicode"
 
 	"github.com/julienschmidt/httprouter"
-	metrics "github.com/rcrowley/go-metrics"
+	"github.com/rcrowley/go-metrics"
 	"github.com/thejerf/suture/v4"
 	"github.com/vitrun/qart/qr"
 	"golang.org/x/text/runes"
@@ -162,7 +162,7 @@ func (s *service) getListener(guiCfg config.GUIConfiguration) (net.Listener, err
 	if err != nil {
 		return nil, err
 	}
-	tlsCfg := tlsutil.SecureDefault()
+	tlsCfg := tlsutil.SecureDefaultWithTLS12()
 	tlsCfg.Certificates = []tls.Certificate{cert}
 
 	if guiCfg.Network() == "unix" {
@@ -915,11 +915,16 @@ func (s *service) getDBFile(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
+	mtimeMapping, mtimeErr := s.model.GetMtimeMapping(folder, file)
 
 	sendJSON(w, map[string]interface{}{
 		"global":       jsonFileInfo(gf),
 		"local":        jsonFileInfo(lf),
 		"availability": av,
+		"mtime": map[string]interface{}{
+			"err":   mtimeErr,
+			"value": mtimeMapping,
+		},
 	})
 }
 
@@ -934,6 +939,8 @@ func (s *service) getDebugFile(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	mtimeMapping, mtimeErr := s.model.GetMtimeMapping(folder, file)
+
 	lf, _ := snap.Get(protocol.LocalDeviceID, file)
 	gf, _ := snap.GetGlobal(file)
 	av := snap.Availability(file)
@@ -944,6 +951,10 @@ func (s *service) getDebugFile(w http.ResponseWriter, r *http.Request) {
 		"local":          jsonFileInfo(lf),
 		"availability":   av,
 		"globalVersions": vl.String(),
+		"mtime": map[string]interface{}{
+			"err":   mtimeErr,
+			"value": mtimeMapping,
+		},
 	})
 }
 

lib/api/api_test.go

@@ -42,6 +42,7 @@ import (
 	"github.com/syncthing/syncthing/lib/sync"
 	"github.com/syncthing/syncthing/lib/tlsutil"
 	"github.com/syncthing/syncthing/lib/ur"
+	"github.com/syncthing/syncthing/lib/util"
 	"github.com/thejerf/suture/v4"
 )
 
@@ -126,6 +127,7 @@ func TestStopAfterBrokenConfig(t *testing.T) {
 
 	srv := New(protocol.LocalDeviceID, w, "", "syncthing", nil, nil, nil, events.NoopLogger, nil, nil, nil, nil, nil, nil, false).(*service)
 	defer os.Remove(token)
+
 	srv.started = make(chan string)
 
 	sup := suture.New("test", svcutil.SpecWithDebugLogger(l))
@@ -1178,7 +1180,7 @@ func TestBrowse(t *testing.T) {
 
 	for _, tc := range cases {
 		ret := browseFiles(tc.current, fs.FilesystemTypeBasic)
-		if !equalStrings(ret, tc.returns) {
+		if !util.EqualStrings(ret, tc.returns) {
 			t.Errorf("browseFiles(%q) => %q, expected %q", tc.current, ret, tc.returns)
 		}
 	}
@@ -1389,18 +1391,6 @@ func TestSanitizedHostname(t *testing.T) {
 	}
 }
 
-func equalStrings(a, b []string) bool {
-	if len(a) != len(b) {
-		return false
-	}
-	for i := range a {
-		if a[i] != b[i] {
-			return false
-		}
-	}
-	return true
-}
-
 // runningInContainer returns true if we are inside Docker or LXC. It might
 // be prone to false negatives if things change in the future, but likely
 // not false positives.

lib/config/observed.pb.go

@@ -7,9 +7,9 @@ import (
 	fmt "fmt"
 	proto "github.com/gogo/protobuf/proto"
 	github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
-	_ "github.com/golang/protobuf/ptypes/timestamp"
 	github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
 	_ "github.com/syncthing/syncthing/proto/ext"
+	_ "google.golang.org/protobuf/types/known/timestamppb"
 	io "io"
 	math "math"
 	math_bits "math/bits"

lib/config/optionsconfiguration.pb.go

@@ -81,6 +81,9 @@ type OptionsConfiguration struct {
 	// meaning no limit. Affects incoming connections and prevents
 	// attempting outgoing connections.
 	ConnectionLimitMax int `protobuf:"varint,52,opt,name=connection_limit_max,json=connectionLimitMax,proto3,casttype=int" json:"connectionLimitMax" xml:"connectionLimitMax"`
+	// When set, this allows TLS 1.2 on sync connections, where we otherwise
+	// default to TLS 1.3+ only.
+	InsecureAllowOldTLSVersions bool `protobuf:"varint,53,opt,name=insecure_allow_old_tls_versions,json=insecureAllowOldTlsVersions,proto3" json:"insecureAllowOldTLSVersions" xml:"insecureAllowOldTLSVersions"`
 	// Legacy deprecated
 	DeprecatedUPnPEnabled        bool     `protobuf:"varint,9000,opt,name=upnp_enabled,json=upnpEnabled,proto3" json:"-" xml:"upnpEnabled,omitempty"`                                    // Deprecated: Do not use.
 	DeprecatedUPnPLeaseM         int      `protobuf:"varint,9001,opt,name=upnp_lease_m,json=upnpLeaseM,proto3,casttype=int" json:"-" xml:"upnpLeaseMinutes,omitempty"`                   // Deprecated: Do not use.
@@ -133,209 +136,213 @@ func init() {
 }
 
 var fileDescriptor_d09882599506ca03 = []byte{
-	// 3218 bytes of a gzipped FileDescriptorProto
+	// 3295 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x5a, 0x5d, 0x6c, 0x1d, 0x47,
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+	0x55, 0xe7, 0x4e, 0x19, 0x7e, 0xde, 0x6f, 0xba, 0x7c, 0x92, 0xd8, 0x4e, 0xcd, 0xd0, 0x60, 0x5f,
+	0x05, 0x07, 0x1b, 0xfa, 0x59, 0x8a, 0x99, 0xe5, 0xf9, 0x5b, 0x56, 0x2b, 0x70, 0xfd, 0xc0, 0x65,
+	0x3b, 0xc6, 0xd3, 0x62, 0x53, 0x4c, 0xb6, 0x23, 0xb3, 0x97, 0x62, 0x36, 0xef, 0x6f, 0x2d, 0x26,
+	0x48, 0x16, 0xd9, 0x8a, 0xe2, 0xae, 0x29, 0x46, 0xa9, 0x39, 0xf8, 0x40, 0xd3, 0x07, 0x9b, 0x68,
+	0x3b, 0x75, 0xd3, 0xf6, 0x89, 0x1d, 0x06, 0x01, 0x26, 0xf6, 0x8e, 0x31, 0x2a, 0xc6, 0x91, 0x8a,
+	0xcb, 0x16, 0xb4, 0xb5, 0x80, 0xb6, 0x63, 0x8e, 0xd3, 0xb9, 0x0a, 0x3f, 0xf2, 0x9b, 0x0a, 0x79,
+	0x76, 0xe4, 0xab, 0xc0, 0x74, 0xc8, 0xc5, 0xed, 0x88, 0xda, 0x2e, 0x54, 0x5a, 0x05, 0x9f, 0x6a,
+	0x7a, 0xbf, 0x1d, 0x20, 0xba, 0x5e, 0xaa, 0x01, 0x9e, 0x11, 0xd3, 0xf2, 0xa1, 0xa8, 0x01, 0xa6,
+	0xd3, 0x1a, 0xc0, 0x4e, 0x6a, 0x80, 0xd9, 0xf8, 0x6c, 0xe6, 0xcd, 0xf2, 0x6c, 0x5c, 0x19, 0x86,
+	0x85, 0x4e, 0x35, 0xaf, 0x17, 0x62, 0xbe, 0x96, 0xfb, 0x2a, 0x46, 0x78, 0x75, 0x60, 0x27, 0xd5,
+	0x41, 0xfd, 0x61, 0xcc, 0xf0, 0xfa, 0x60, 0x3a, 0xae, 0x0f, 0x4a, 0xc6, 0x02, 0x0f, 0xfc, 0x44,
+	0xd3, 0x87, 0xca, 0xee, 0xa5, 0xd7, 0x32, 0xcf, 0x8a, 0xf9, 0x77, 0x0f, 0x22, 0xf3, 0xe4, 0x34,
+	0x94, 0x5e, 0x14, 0x8a, 0x56, 0xca, 0x2f, 0x0a, 0x4a, 0xb4, 0xdb, 0xd2, 0xd8, 0xdd, 0xaf, 0xe7,
+	0xb6, 0xa1, 0xda, 0x32, 0xf8, 0xba, 0xa6, 0x0f, 0x52, 0x16, 0x12, 0x8b, 0x67, 0x4e, 0xc8, 0x73,
+	0x37, 0xb1, 0x15, 0xe7, 0xc3, 0xd4, 0x78, 0x2e, 0xcb, 0x47, 0xfb, 0xb9, 0xc6, 0xed, 0x54, 0x61,
+	0x89, 0xe3, 0x4b, 0x59, 0x96, 0xa4, 0xc0, 0x8a, 0xc9, 0xbc, 0x14, 0xd0, 0x8e, 0x8d, 0xdf, 0x1c,
+	0x83, 0x2a, 0x6b, 0xbc, 0x46, 0x2e, 0xd1, 0xe0, 0x71, 0x95, 0x1a, 0xcf, 0x0b, 0x12, 0xaf, 0xf1,
+	0x44, 0xad, 0xd0, 0x6c, 0xc1, 0x25, 0x79, 0x2d, 0x51, 0x41, 0xe4, 0x1c, 0xb1, 0x10, 0x50, 0x27,
+	0xc6, 0x60, 0xd5, 0x0e, 0xcf, 0xca, 0x7b, 0x44, 0xef, 0xe9, 0x43, 0xd7, 0x0b, 0x22, 0x86, 0x3a,
+	0x07, 0x91, 0xd9, 0x0b, 0xd1, 0xd6, 0x12, 0x0b, 0xa5, 0x27, 0xae, 0x53, 0x34, 0xff, 0xcc, 0x2e,
+	0xa3, 0x72, 0xd9, 0x03, 0x9f, 0xe1, 0x4a, 0x16, 0xa1, 0x6c, 0x0f, 0x6c, 0xea, 0x67, 0x78, 0xd9,
+	0xb9, 0x8a, 0x28, 0xb6, 0xe2, 0x37, 0x47, 0xe3, 0xca, 0x88, 0x36, 0xda, 0x3b, 0xd1, 0x9b, 0xa6,
+	0x45, 0xcb, 0x42, 0x2a, 0x6e, 0x0f, 0x7b, 0x53, 0xd5, 0x58, 0x96, 0x45, 0x8e, 0xa2, 0xb8, 0x36,
+	0x92, 0x14, 0x21, 0xc9, 0xf2, 0x78, 0x67, 0xbf, 0xae, 0xc1, 0x52, 0x53, 0xf0, 0xdd, 0xa3, 0xfa,
+	0x25, 0x1e, 0x35, 0xb2, 0x70, 0xc1, 0x8b, 0x58, 0xdb, 0x6f, 0xf2, 0x25, 0x1b, 0xe0, 0x37, 0x43,
+	0x4c, 0x99, 0xb5, 0xe1, 0xae, 0x1a, 0x57, 0xc5, 0x74, 0xfc, 0x59, 0x4b, 0xde, 0x2a, 0x17, 0xd0,
+	0xf6, 0xf4, 0x1c, 0x8c, 0xf1, 0xdb, 0xee, 0x54, 0x3b, 0x32, 0xcd, 0x26, 0xda, 0xce, 0xb6, 0x38,
+	0x9b, 0x4b, 0x6c, 0xe4, 0x2a, 0xd9, 0x29, 0xf8, 0x00, 0x3d, 0xa9, 0x00, 0x7c, 0xa0, 0xc9, 0x07,
+	0xab, 0x24, 0xaf, 0x9f, 0x25, 0xba, 0xf0, 0x01, 0xcd, 0x56, 0xc1, 0xe7, 0x9a, 0x3e, 0x98, 0x3d,
+	0xc1, 0x78, 0x48, 0x7e, 0xb4, 0x1d, 0x13, 0x1b, 0xf8, 0x23, 0x3e, 0x12, 0x03, 0xe9, 0x13, 0xc6,
+	0xfc, 0xe4, 0x1d, 0xf9, 0xdd, 0x76, 0x00, 0x29, 0xe4, 0x59, 0x22, 0xad, 0x02, 0x55, 0x2f, 0x67,
+	0x4a, 0x23, 0x5d, 0xe4, 0xd2, 0xd6, 0x57, 0x92, 0x82, 0x79, 0x2b, 0x24, 0x3d, 0xfa, 0x6e, 0xea,
+	0xe7, 0xc5, 0x2b, 0x4b, 0x23, 0xf4, 0xbc, 0x24, 0xab, 0xf1, 0x49, 0x5a, 0xa2, 0x1a, 0xe3, 0xc2,
+	0xd3, 0x5b, 0x3c, 0x6b, 0xe0, 0x5a, 0xb3, 0xa1, 0xe7, 0x89, 0x7c, 0xe4, 0x2e, 0x49, 0x8a, 0xca,
+	0x4e, 0x64, 0x5e, 0x4c, 0x8e, 0x2c, 0x15, 0x5c, 0x83, 0x5d, 0xda, 0x81, 0xd7, 0xf4, 0xd3, 0x0d,
+	0x8c, 0x58, 0x18, 0x60, 0xab, 0xe1, 0xa1, 0x35, 0x6a, 0x4c, 0x88, 0x7d, 0x77, 0x99, 0x9f, 0xf4,
+	0x09, 0x30, 0xcb, 0xe5, 0xd9, 0x8b, 0x8c, 0x24, 0xac, 0xc1, 0x82, 0x0a, 0xd8, 0xd2, 0x87, 0xa4,
+	0x87, 0x98, 0xb8, 0xc6, 0xc1, 0xc4, 0x0f, 0xd7, 0xd6, 0x8d, 0x6b, 0x62, 0xd1, 0xbe, 0x2c, 0xc2,
+	0x6b, 0xa6, 0x32, 0xcf, 0x35, 0x5e, 0x11, 0x0a, 0x59, 0xd6, 0xa3, 0x44, 0xb3, 0x8c, 0x42, 0xdd,
+	0x18, 0x6c, 0xe8, 0x03, 0x95, 0x8e, 0x9b, 0x68, 0xdb, 0xb8, 0x2e, 0x7a, 0x7d, 0x89, 0x27, 0x83,
+	0xa5, 0x86, 0x0b, 0x68, 0xbb, 0x13, 0x99, 0x86, 0xaa, 0xcb, 0x05, 0xb4, 0x9d, 0xf5, 0xa7, 0x68,
+	0x06, 0xde, 0x3b, 0xaa, 0x9b, 0xe9, 0xed, 0x92, 0x85, 0x3c, 0x9e, 0x52, 0xf8, 0x9e, 0x63, 0x31,
+	0x8f, 0x5a, 0x3c, 0x7e, 0xb8, 0x3e, 0xa1, 0xc6, 0x8b, 0x62, 0xbe, 0x3e, 0xe6, 0x2b, 0xf3, 0x42,
+	0x7a, 0x97, 0x33, 0xc9, 0x55, 0xef, 0x7a, 0xce, 0xf2, 0xfc, 0xd2, 0xff, 0x25, 0x7a, 0xed, 0xc8,
+	0xbc, 0xe0, 0x76, 0x87, 0xb3, 0x7c, 0xe7, 0x3e, 0x3a, 0x7c, 0x7d, 0xde, 0xd7, 0xc6, 0xfd, 0xe1,
+	0xdd, 0xfd, 0xfa, 0xfd, 0x08, 0xc2, 0x6a, 0x5b, 0x8f, 0xa6, 0x20, 0xf8, 0xb2, 0xde, 0x13, 0xb6,
+	0x48, 0x2b, 0x3b, 0x50, 0x7f, 0x31, 0x2b, 0xdc, 0xfe, 0xff, 0x83, 0xc8, 0x3c, 0x97, 0xe7, 0x72,
+	0x2b, 0x8b, 0x64, 0x31, 0x3f, 0x5d, 0x45, 0x16, 0x97, 0x24, 0xb8, 0x2d, 0xd2, 0x4a, 0x00, 0x29,
+	0x7f, 0xdb, 0xdd, 0xaf, 0xab, 0x1b, 0x1b, 0x1a, 0x3c, 0x25, 0x35, 0x01, 0x3f, 0xd3, 0x92, 0xee,
+	0xd3, 0xe7, 0x8b, 0x0f, 0x66, 0xc5, 0x74, 0xbf, 0x23, 0xe2, 0x41, 0xd1, 0x44, 0xf6, 0x94, 0x21,
+	0xba, 0x1f, 0xc9, 0xba, 0x97, 0x9f, 0x20, 0x24, 0x0e, 0x79, 0xe0, 0x3b, 0xdf, 0x5d, 0x8b, 0x6f,
+	0x70, 0x55, 0x2f, 0x86, 0x06, 0xf5, 0xbc, 0x15, 0xf8, 0x8d, 0xa6, 0xf7, 0x0a, 0x9a, 0xf9, 0x43,
+	0xc5, 0x2f, 0x63, 0xa2, 0xdf, 0x14, 0xf5, 0x41, 0xd1, 0x84, 0xf4, 0x68, 0x21, 0xa8, 0xd6, 0x32,
+	0xaa, 0xc5, 0x67, 0x06, 0x25, 0xd9, 0x8b, 0xf7, 0xd3, 0xe3, 0x55, 0x80, 0xba, 0x2f, 0x43, 0x83,
+	0x3d, 0x72, 0xcb, 0x9c, 0x72, 0xfe, 0x1c, 0xf1, 0x61, 0x77, 0xca, 0xd2, 0xd3, 0x44, 0x89, 0x72,
+	0xf1, 0x31, 0xa1, 0x3b, 0xe5, 0x6e, 0x7a, 0x55, 0xca, 0xa9, 0x66, 0x4a, 0x39, 0x7b, 0x7d, 0x68,
+	0xe8, 0xf1, 0xb3, 0x67, 0x96, 0x3e, 0xfc, 0x6a, 0x56, 0xc4, 0xb1, 0xff, 0x29, 0xf2, 0x15, 0x2f,
+	0x87, 0x79, 0x1e, 0x21, 0x2d, 0xc6, 0x20, 0x47, 0x8a, 0xc5, 0x44, 0x8f, 0x84, 0x50, 0x71, 0x79,
+	0x53, 0xbd, 0x37, 0xb1, 0x5a, 0x36, 0x33, 0x3e, 0xe2, 0x43, 0xa4, 0x4d, 0x2d, 0x1c, 0x44, 0xe6,
+	0xc5, 0xbc, 0xc7, 0x85, 0xe2, 0xad, 0xc7, 0xa2, 0xcd, 0x8a, 0xe3, 0xd4, 0xac, 0xe0, 0xc5, 0xee,
+	0x41, 0x55, 0x81, 0xe7, 0x4a, 0x03, 0xa5, 0x4c, 0x81, 0xda, 0x88, 0x50, 0xe3, 0xd7, 0xf1, 0x2c,
+	0x2d, 0x97, 0x28, 0xc8, 0x27, 0xec, 0x12, 0x57, 0x2c, 0x51, 0xa8, 0xe0, 0xd5, 0xa9, 0x12, 0x4c,
+	0x2a, 0x7a, 0x53, 0xb7, 0x3f, 0xf9, 0x6c, 0xf8, 0xc8, 0xfe, 0x67, 0xc3, 0x47, 0x3e, 0x39, 0x18,
+	0xd6, 0xf6, 0x0f, 0x86, 0xb5, 0x6f, 0xdf, 0x1b, 0x3e, 0xf2, 0xfe, 0xbd, 0x61, 0x6d, 0xff, 0xde,
+	0xf0, 0x91, 0xbf, 0xdd, 0x1b, 0x3e, 0xf2, 0xc6, 0x33, 0x6b, 0x2e, 0x5b, 0x0f, 0x57, 0xaf, 0xd8,
+	0x7e, 0xf3, 0x6a, 0x96, 0xbf, 0x4b, 0xbf, 0xf2, 0xff, 0x71, 0xad, 0x9e, 0x10, 0x7f, 0xdc, 0xba,
+	0xf6, 0x9f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x1c, 0x3d, 0xe9, 0x4b, 0x24, 0x26, 0x00, 0x00,
 }
 
 func (m *OptionsConfiguration) Marshal() (dAtA []byte, err error) {
@@ -431,6 +438,18 @@ func (m *OptionsConfiguration) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0xc0
 	}
+	if m.InsecureAllowOldTLSVersions {
+		i--
+		if m.InsecureAllowOldTLSVersions {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x3
+		i--
+		dAtA[i] = 0xa8
+	}
 	if m.ConnectionLimitMax != 0 {
 		i = encodeVarintOptionsconfiguration(dAtA, i, uint64(m.ConnectionLimitMax))
 		i--
@@ -1072,6 +1091,9 @@ func (m *OptionsConfiguration) ProtoSize() (n int) {
 	if m.ConnectionLimitMax != 0 {
 		n += 2 + sovOptionsconfiguration(uint64(m.ConnectionLimitMax))
 	}
+	if m.InsecureAllowOldTLSVersions {
+		n += 3
+	}
 	if m.DeprecatedUPnPEnabled {
 		n += 4
 	}
@@ -2288,6 +2310,26 @@ func (m *OptionsConfiguration) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 53:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field InsecureAllowOldTLSVersions", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOptionsconfiguration
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.InsecureAllowOldTLSVersions = bool(v != 0)
 		case 9000:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field DeprecatedUPnPEnabled", wireType)

lib/config/wrapper.go

@@ -4,6 +4,7 @@
 // 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/.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
 //go:generate counterfeiter -o mocks/mocked_wrapper.go --fake-name Wrapper . Wrapper
 
 package config

lib/connections/connections_test.go

@@ -8,12 +8,26 @@ package connections
 
 import (
 	"context"
+	"crypto/tls"
 	"errors"
+	"fmt"
+	"io/ioutil"
+	"math/rand"
+	"net"
 	"net/url"
+	"os"
+	"strings"
 	"testing"
+	"time"
+
+	"github.com/thejerf/suture/v4"
 
 	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/events"
+	"github.com/syncthing/syncthing/lib/nat"
 	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/sync"
+	"github.com/syncthing/syncthing/lib/tlsutil"
 )
 
 func TestFixupPort(t *testing.T) {
@@ -216,3 +230,196 @@ func TestConnectionStatus(t *testing.T) {
 
 	check(nil, nil)
 }
+
+func BenchmarkConnections(pb *testing.B) {
+	addrs := []string{
+		"tcp://127.0.0.1:0",
+		"quic://127.0.0.1:0",
+		"relay://127.0.0.1:22067",
+	}
+	sizes := []int{
+		1 << 10,
+		1 << 15,
+		1 << 20,
+		1 << 22,
+	}
+	haveRelay := false
+	// Check if we have a relay running locally
+	conn, err := net.DialTimeout("tcp", "127.0.0.1:22067", 100*time.Millisecond)
+	if err == nil {
+		haveRelay = true
+		_ = conn.Close()
+	}
+	for _, addr := range addrs {
+		for _, sz := range sizes {
+			for _, direction := range []string{"cs", "sc"} {
+				proto := strings.SplitN(addr, ":", 2)[0]
+				pb.Run(fmt.Sprintf("%s_%d_%s", proto, sz, direction), func(b *testing.B) {
+					if proto == "relay" && !haveRelay {
+						b.Skip("could not connect to relay")
+					}
+					withConnectionPair(b, addr, func(client, server internalConn) {
+						if direction == "sc" {
+							server, client = client, server
+						}
+						data := make([]byte, sz)
+						if _, err := rand.Read(data); err != nil {
+							b.Fatal(err)
+						}
+
+						total := 0
+						wg := sync.NewWaitGroup()
+						b.ResetTimer()
+						for i := 0; i < b.N; i++ {
+							wg.Add(2)
+							go func() {
+								if err := sendMsg(client, data); err != nil {
+									b.Fatal(err)
+								}
+								wg.Done()
+							}()
+							go func() {
+								if err := recvMsg(server, data); err != nil {
+									b.Fatal(err)
+								}
+								total += sz
+								wg.Done()
+							}()
+							wg.Wait()
+						}
+						b.ReportAllocs()
+						b.SetBytes(int64(total / b.N))
+					})
+				})
+			}
+
+		}
+	}
+}
+
+func sendMsg(c internalConn, buf []byte) error {
+	n, err := c.Write(buf)
+	if n != len(buf) || err != nil {
+		return err
+	}
+	return nil
+}
+
+func recvMsg(c internalConn, buf []byte) error {
+	for read := 0; read != len(buf); {
+		n, err := c.Read(buf)
+		read += n
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func withConnectionPair(b *testing.B, connUri string, h func(client, server internalConn)) {
+	// Root of the service tree.
+	supervisor := suture.New("main", suture.Spec{
+		PassThroughPanics: true,
+	})
+
+	cert := mustGetCert(b)
+	deviceId := protocol.NewDeviceID(cert.Certificate[0])
+	tlsCfg := tlsutil.SecureDefaultTLS13()
+	tlsCfg.Certificates = []tls.Certificate{cert}
+	tlsCfg.NextProtos = []string{"bench"}
+	tlsCfg.ClientAuth = tls.RequestClientCert
+	tlsCfg.SessionTicketsDisabled = true
+	tlsCfg.InsecureSkipVerify = true
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	supervisor.ServeBackground(ctx)
+
+	cfg := config.Configuration{
+		Options: config.OptionsConfiguration{
+			RelaysEnabled: true,
+		},
+	}
+	wcfg := config.Wrap("", cfg, deviceId, events.NoopLogger)
+	uri, err := url.Parse(connUri)
+	if err != nil {
+		b.Fatal(err)
+	}
+	lf, err := getListenerFactory(cfg, uri)
+	if err != nil {
+		b.Fatal(err)
+	}
+	natSvc := nat.NewService(deviceId, wcfg)
+	conns := make(chan internalConn, 1)
+	listenSvc := lf.New(uri, wcfg, tlsCfg, conns, natSvc)
+	supervisor.Add(listenSvc)
+
+	var addr *url.URL
+	for {
+		addrs := listenSvc.LANAddresses()
+		if len(addrs) > 0 {
+			if !strings.HasSuffix(addrs[0].Host, ":0") {
+				addr = addrs[0]
+				break
+			}
+		}
+		time.Sleep(time.Millisecond)
+	}
+
+	df, err := getDialerFactory(cfg, addr)
+	if err != nil {
+		b.Fatal(err)
+	}
+	dialer := df.New(cfg.Options, tlsCfg)
+
+	// Relays might take some time to register the device, so dial multiple times
+	clientConn, err := dialer.Dial(ctx, deviceId, addr)
+	if err != nil {
+		for i := 0; i < 10 && err != nil; i++ {
+			clientConn, err = dialer.Dial(ctx, deviceId, addr)
+			time.Sleep(100 * time.Millisecond)
+		}
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+
+	data := []byte("hello")
+
+	// Quic does not start a stream until some data is sent through, so send something for the AcceptStream
+	// to fire on the other side.
+	if err := sendMsg(clientConn, data); err != nil {
+		b.Fatal(err)
+	}
+
+	serverConn := <-conns
+
+	if err := recvMsg(serverConn, data); err != nil {
+		b.Fatal(err)
+	}
+
+	h(clientConn, serverConn)
+
+	_ = clientConn.Close()
+	_ = serverConn.Close()
+}
+
+func mustGetCert(b *testing.B) tls.Certificate {
+	f1, err := ioutil.TempFile("", "")
+	if err != nil {
+		b.Fatal(err)
+	}
+	f1.Close()
+	f2, err := ioutil.TempFile("", "")
+	if err != nil {
+		b.Fatal(err)
+	}
+	f2.Close()
+	cert, err := tlsutil.NewCertificate(f1.Name(), f2.Name(), "bench", 10)
+	if err != nil {
+		b.Fatal(err)
+	}
+	_ = os.Remove(f1.Name())
+	_ = os.Remove(f2.Name())
+	return cert
+}

lib/connections/quic_listen.go

@@ -48,6 +48,7 @@ type quicListener struct {
 	factory listenerFactory
 
 	address *url.URL
+	laddr   net.Addr
 	mut     sync.Mutex
 }
 
@@ -82,18 +83,33 @@ func (t *quicListener) OnExternalAddressChanged(address *stun.Host, via string)
 func (t *quicListener) serve(ctx context.Context) error {
 	network := strings.ReplaceAll(t.uri.Scheme, "quic", "udp")
 
-	packetConn, err := net.ListenPacket(network, t.uri.Host)
+	udpAddr, err := net.ResolveUDPAddr(network, t.uri.Host)
 	if err != nil {
 		l.Infoln("Listen (BEP/quic):", err)
 		return err
 	}
-	defer func() { _ = packetConn.Close() }()
 
-	svc, conn := stun.New(t.cfg, t, packetConn)
-	defer func() { _ = conn.Close() }()
-	wrapped := &stunConnQUICWrapper{
+	udpConn, err := net.ListenUDP(network, udpAddr)
+	if err != nil {
+		l.Infoln("Listen (BEP/quic):", err)
+		return err
+	}
+	defer func() { _ = udpConn.Close() }()
+
+	svc, conn := stun.New(t.cfg, t, udpConn)
+	defer conn.Close()
+
+	quicWrapper := quicWrapper{
 		PacketConn: conn,
-		underlying: packetConn.(*net.UDPConn),
+		underlying: udpConn,
+	}
+	var wrapped net.PacketConn = &quicWrapper
+
+	if oobConn, ok := conn.(oobConn); ok {
+		l.Debugf("wrapping in oob conn")
+		wrapped = &oobConnWrapper{
+			quicWrapper, oobConn,
+		}
 	}
 
 	go svc.Serve(ctx)
@@ -106,12 +122,22 @@ func (t *quicListener) serve(ctx context.Context) error {
 		l.Infoln("Listen (BEP/quic):", err)
 		return err
 	}
-	t.notifyAddressesChanged(t)
 	defer listener.Close()
+
+	t.notifyAddressesChanged(t)
 	defer t.clearAddresses(t)
 
-	l.Infof("QUIC listener (%v) starting", packetConn.LocalAddr())
-	defer l.Infof("QUIC listener (%v) shutting down", packetConn.LocalAddr())
+	l.Infof("QUIC listener (%v) starting", udpConn.LocalAddr())
+	defer l.Infof("QUIC listener (%v) shutting down", udpConn.LocalAddr())
+
+	t.mut.Lock()
+	t.laddr = udpConn.LocalAddr()
+	t.mut.Unlock()
+	defer func() {
+		t.mut.Lock()
+		t.laddr = nil
+		t.mut.Unlock()
+	}()
 
 	acceptFailures := 0
 	const maxAcceptFailures = 10
@@ -164,8 +190,8 @@ func (t *quicListener) URI() *url.URL {
 }
 
 func (t *quicListener) WANAddresses() []*url.URL {
-	uris := []*url.URL{t.uri}
 	t.mut.Lock()
+	uris := []*url.URL{maybeReplacePort(t.uri, t.laddr)}
 	if t.address != nil {
 		uris = append(uris, t.address)
 	}
@@ -174,9 +200,12 @@ func (t *quicListener) WANAddresses() []*url.URL {
 }
 
 func (t *quicListener) LANAddresses() []*url.URL {
-	addrs := []*url.URL{t.uri}
-	network := strings.ReplaceAll(t.uri.Scheme, "quic", "udp")
-	addrs = append(addrs, getURLsForAllAdaptersIfUnspecified(network, t.uri)...)
+	t.mut.Lock()
+	uri := maybeReplacePort(t.uri, t.laddr)
+	t.mut.Unlock()
+	addrs := []*url.URL{uri}
+	network := strings.ReplaceAll(uri.Scheme, "quic", "udp")
+	addrs = append(addrs, getURLsForAllAdaptersIfUnspecified(network, uri)...)
 	return addrs
 }
 
@@ -219,17 +248,32 @@ func (quicListenerFactory) Enabled(cfg config.Configuration) bool {
 	return true
 }
 
-type stunConnQUICWrapper struct {
+// quicWrapper provides methods used by quic
+// https://github.com/lucas-clemente/quic-go/blob/master/packet_handler_map.go#L85
+type quicWrapper struct {
 	net.PacketConn
 	underlying *net.UDPConn
 }
 
-// SetReadBuffer is required by QUIC < v0.20.0
-func (s *stunConnQUICWrapper) SetReadBuffer(size int) error {
+// SetReadBuffer is required by QUIC
+func (s *quicWrapper) SetReadBuffer(size int) error {
 	return s.underlying.SetReadBuffer(size)
 }
 
 // SyscallConn is required by QUIC
-func (s *stunConnQUICWrapper) SyscallConn() (syscall.RawConn, error) {
+func (s *quicWrapper) SyscallConn() (syscall.RawConn, error) {
 	return s.underlying.SyscallConn()
 }
+
+// oobConn is used to assert that stun package returned a net.PacketConn that implements this interface.
+// If it does, we then wrap quicWrapper in oobConnWrapper, to expose those methods to QUIC package.
+type oobConn interface {
+	ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error)
+	WriteMsgUDP(b, oob []byte, addr *net.UDPAddr) (n, oobn int, err error)
+}
+
+// See: https://pkg.go.dev/github.com/lucas-clemente/quic-go#OOBCapablePacketConn
+type oobConnWrapper struct {
+	quicWrapper
+	oobConn
+}

lib/connections/relay_listen.go

@@ -44,38 +44,39 @@ type relayListener struct {
 }
 
 func (t *relayListener) serve(ctx context.Context) error {
-	clnt, err := client.NewClient(t.uri, t.tlsCfg.Certificates, nil, 10*time.Second)
+	clnt, err := client.NewClient(t.uri, t.tlsCfg.Certificates, 10*time.Second)
 	if err != nil {
 		l.Infoln("Listen (BEP/relay):", err)
 		return err
 	}
-	invitations := clnt.Invitations()
 
 	t.mut.Lock()
 	t.client = clnt
-	go clnt.Serve(ctx)
 	t.mut.Unlock()
 
-	// Start with nil, so that we send a addresses changed notification as soon as we connect somewhere.
-	var oldURI *url.URL
-
 	l.Infof("Relay listener (%v) starting", t)
 	defer l.Infof("Relay listener (%v) shutting down", t)
 	defer t.clearAddresses(t)
 
+	invitationCtx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	go t.handleInvitations(invitationCtx, clnt)
+
+	return clnt.Serve(ctx)
+}
+
+func (t *relayListener) handleInvitations(ctx context.Context, clnt client.RelayClient) {
+	invitations := clnt.Invitations()
+
+	// Start with nil, so that we send a addresses changed notification as soon as we connect somewhere.
+	var oldURI *url.URL
+
 	for {
 		select {
-		case inv, ok := <-invitations:
-			if !ok {
-				if err := clnt.Error(); err != nil {
-					l.Infoln("Listen (BEP/relay):", err)
-				}
-				return err
-			}
-
+		case inv := <-invitations:
 			conn, err := client.JoinSession(ctx, inv)
 			if err != nil {
-				if errors.Cause(err) != context.Canceled {
+				if !errors.Is(err, context.Canceled) {
 					l.Infoln("Listen (BEP/relay): joining session:", err)
 				}
 				continue
@@ -119,7 +120,7 @@ func (t *relayListener) serve(ctx context.Context) error {
 			}
 
 		case <-ctx.Done():
-			return ctx.Err()
+			return
 		}
 	}
 }

lib/connections/service.go

@@ -4,6 +4,7 @@
 // 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/.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
 //go:generate counterfeiter -o mocks/service.go --fake-name Service . Service
 
 package connections
@@ -141,10 +142,11 @@ type service struct {
 	natService           *nat.Service
 	evLogger             events.Logger
 
-	listenersMut       sync.RWMutex
-	listeners          map[string]genericListener
-	listenerTokens     map[string]suture.ServiceToken
-	listenerSupervisor *suture.Supervisor
+	deviceAddressesChanged chan struct{}
+	listenersMut           sync.RWMutex
+	listeners              map[string]genericListener
+	listenerTokens         map[string]suture.ServiceToken
+	listenerSupervisor     *suture.Supervisor
 }
 
 func NewService(cfg config.Wrapper, myID protocol.DeviceID, mdl Model, tlsCfg *tls.Config, discoverer discover.Finder, bepProtocolName string, tlsDefaultCommonName string, evLogger events.Logger) Service {
@@ -165,22 +167,10 @@ func NewService(cfg config.Wrapper, myID protocol.DeviceID, mdl Model, tlsCfg *t
 		natService:           nat.NewService(myID, cfg),
 		evLogger:             evLogger,
 
-		listenersMut:   sync.NewRWMutex(),
-		listeners:      make(map[string]genericListener),
-		listenerTokens: make(map[string]suture.ServiceToken),
-
-		// A listener can fail twice, rapidly. Any more than that and it
-		// will be put on suspension for ten minutes. Restarts and changes
-		// due to config are done by removing and adding services, so are
-		// not subject to these limitations.
-		listenerSupervisor: suture.New("c.S.listenerSupervisor", suture.Spec{
-			EventHook: func(e suture.Event) {
-				l.Infoln(e)
-			},
-			FailureThreshold:  2,
-			FailureBackoff:    600 * time.Second,
-			PassThroughPanics: true,
-		}),
+		deviceAddressesChanged: make(chan struct{}, 1),
+		listenersMut:           sync.NewRWMutex(),
+		listeners:              make(map[string]genericListener),
+		listenerTokens:         make(map[string]suture.ServiceToken),
 	}
 	cfg.Subscribe(service)
 
@@ -198,7 +188,6 @@ func NewService(cfg config.Wrapper, myID protocol.DeviceID, mdl Model, tlsCfg *t
 
 	service.Add(svcutil.AsService(service.connect, fmt.Sprintf("%s/connect", service)))
 	service.Add(svcutil.AsService(service.handle, fmt.Sprintf("%s/handle", service)))
-	service.Add(service.listenerSupervisor)
 	service.Add(service.natService)
 
 	svcutil.OnSupervisorDone(service.Supervisor, func() {
@@ -392,6 +381,7 @@ func (s *service) connect(ctx context.Context) error {
 		l.Debugln("Next connection loop in", sleep)
 
 		select {
+		case <-s.deviceAddressesChanged:
 		case <-time.After(sleep):
 		case <-ctx.Done():
 			return ctx.Err()
@@ -644,8 +634,18 @@ func (s *service) createListener(factory listenerFactory, uri *url.URL) bool {
 
 	listener := factory.New(uri, s.cfg, s.tlsCfg, s.conns, s.natService)
 	listener.OnAddressesChanged(s.logListenAddressesChangedEvent)
+
+	// Retrying a listener many times in rapid succession is unlikely to help,
+	// thus back off quickly. A listener may soon be functional again, e.g. due
+	// to a network interface coming back online - retry every minute.
+	spec := svcutil.SpecWithInfoLogger(l)
+	spec.FailureThreshold = 2
+	spec.FailureBackoff = time.Minute
+	sup := suture.New(fmt.Sprintf("listenerSupervisor@%v", listener), spec)
+	sup.Add(listener)
+
 	s.listeners[uri.String()] = listener
-	s.listenerTokens[uri.String()] = s.listenerSupervisor.Add(listener)
+	s.listenerTokens[uri.String()] = s.Add(sup)
 	return true
 }
 
@@ -675,6 +675,8 @@ func (s *service) CommitConfiguration(from, to config.Configuration) bool {
 		}
 	}
 
+	s.checkAndSignalConnectLoopOnUpdatedDevices(from, to)
+
 	s.listenersMut.Lock()
 	seen := make(map[string]struct{})
 	for _, addr := range to.Options.ListenAddresses() {
@@ -733,6 +735,25 @@ func (s *service) CommitConfiguration(from, to config.Configuration) bool {
 	return true
 }
 
+func (s *service) checkAndSignalConnectLoopOnUpdatedDevices(from, to config.Configuration) {
+	oldDevices := make(map[protocol.DeviceID]config.DeviceConfiguration, len(from.Devices))
+	for _, dev := range from.Devices {
+		oldDevices[dev.DeviceID] = dev
+	}
+
+	for _, dev := range to.Devices {
+		oldDev, ok := oldDevices[dev.DeviceID]
+		if !ok || !util.EqualStrings(oldDev.Addresses, dev.Addresses) {
+			select {
+			case s.deviceAddressesChanged <- struct{}{}:
+			default:
+				// channel is blocked - a config update is already pending for the connection loop.
+			}
+			break
+		}
+	}
+}
+
 func (s *service) AllAddresses() []string {
 	s.listenersMut.RLock()
 	var addrs []string

lib/connections/tcp_listen.go

@@ -40,6 +40,7 @@ type tcpListener struct {
 
 	natService *nat.Service
 	mapping    *nat.Mapping
+	laddr      net.Addr
 
 	mut sync.RWMutex
 }
@@ -60,25 +61,37 @@ func (t *tcpListener) serve(ctx context.Context) error {
 		l.Infoln("Listen (BEP/tcp):", err)
 		return err
 	}
-	t.notifyAddressesChanged(t)
-	registry.Register(t.uri.Scheme, tcaddr)
-
 	defer listener.Close()
+
+	// We might bind to :0, so use the port we've been given.
+	tcaddr = listener.Addr().(*net.TCPAddr)
+
+	t.notifyAddressesChanged(t)
 	defer t.clearAddresses(t)
+
+	registry.Register(t.uri.Scheme, tcaddr)
 	defer registry.Unregister(t.uri.Scheme, tcaddr)
 
-	l.Infof("TCP listener (%v) starting", listener.Addr())
-	defer l.Infof("TCP listener (%v) shutting down", listener.Addr())
+	l.Infof("TCP listener (%v) starting", tcaddr)
+	defer l.Infof("TCP listener (%v) shutting down", tcaddr)
 
 	mapping := t.natService.NewMapping(nat.TCP, tcaddr.IP, tcaddr.Port)
 	mapping.OnChanged(func(_ *nat.Mapping, _, _ []nat.Address) {
 		t.notifyAddressesChanged(t)
 	})
+	// Should be called after t.mapping is nil'ed out.
 	defer t.natService.RemoveMapping(mapping)
 
 	t.mut.Lock()
 	t.mapping = mapping
+	t.laddr = tcaddr
 	t.mut.Unlock()
+	defer func() {
+		t.mut.Lock()
+		t.mapping = nil
+		t.laddr = nil
+		t.mut.Unlock()
+	}()
 
 	acceptFailures := 0
 	const maxAcceptFailures = 10
@@ -94,9 +107,6 @@ func (t *tcpListener) serve(ctx context.Context) error {
 			if err == nil {
 				conn.Close()
 			}
-			t.mut.Lock()
-			t.mapping = nil
-			t.mut.Unlock()
 			return nil
 		default:
 		}
@@ -146,8 +156,10 @@ func (t *tcpListener) URI() *url.URL {
 }
 
 func (t *tcpListener) WANAddresses() []*url.URL {
-	uris := []*url.URL{t.uri}
 	t.mut.RLock()
+	uris := []*url.URL{
+		maybeReplacePort(t.uri, t.laddr),
+	}
 	if t.mapping != nil {
 		addrs := t.mapping.ExternalAddresses()
 		for _, addr := range addrs {
@@ -179,8 +191,11 @@ func (t *tcpListener) WANAddresses() []*url.URL {
 }
 
 func (t *tcpListener) LANAddresses() []*url.URL {
-	addrs := []*url.URL{t.uri}
-	addrs = append(addrs, getURLsForAllAdaptersIfUnspecified(t.uri.Scheme, t.uri)...)
+	t.mut.RLock()
+	uri := maybeReplacePort(t.uri, t.laddr)
+	t.mut.RUnlock()
+	addrs := []*url.URL{uri}
+	addrs = append(addrs, getURLsForAllAdaptersIfUnspecified(uri.Scheme, uri)...)
 	return addrs
 }
 

lib/connections/util.go

@@ -117,3 +117,30 @@ func isV4Local(ip net.IP) bool {
 	}
 	return false
 }
+
+func maybeReplacePort(uri *url.URL, laddr net.Addr) *url.URL {
+	if laddr == nil {
+		return uri
+	}
+
+	host, portStr, err := net.SplitHostPort(uri.Host)
+	if err != nil {
+		return uri
+	}
+	port, err := strconv.Atoi(portStr)
+	if err != nil {
+		return uri
+	}
+	if port != 0 {
+		return uri
+	}
+
+	_, lportStr, err := net.SplitHostPort(laddr.String())
+	if err != nil {
+		return uri
+	}
+
+	uriCopy := *uri
+	uriCopy.Host = net.JoinHostPort(host, lportStr)
+	return &uriCopy
+}

lib/db/keyer.go

@@ -36,7 +36,7 @@ const (
 	// KeyTypeFolderStatistic <folder ID as string> <some string> = some value
 	KeyTypeFolderStatistic byte = 4
 
-	// KeyTypeVirtualMtime <int32 folder ID> <file name> = dbMtime
+	// KeyTypeVirtualMtime <int32 folder ID> <file name> = mtimeMapping
 	KeyTypeVirtualMtime byte = 5
 
 	// KeyTypeFolderIdx <int32 id> = string value

lib/db/schemaupdater.go

@@ -20,7 +20,7 @@ import (
 // do not put restrictions on downgrades (e.g. for repairs after a bugfix).
 const (
 	dbVersion             = 14
-	dbMigrationVersion    = 16
+	dbMigrationVersion    = 17
 	dbMinSyncthingVersion = "v1.9.0"
 )
 
@@ -101,6 +101,7 @@ func (db *schemaUpdater) updateSchema() error {
 		{13, 13, "v1.7.0", db.updateSchemaTo13},
 		{14, 14, "v1.9.0", db.updateSchemaTo14},
 		{14, 16, "v1.9.0", db.checkRepairMigration},
+		{14, 17, "v1.9.0", db.migration17},
 	}
 
 	for _, m := range migrations {
@@ -783,6 +784,53 @@ func (db *schemaUpdater) checkRepairMigration(_ int) error {
 	return nil
 }
 
+// migration17 finds all files that were pulled as invalid from an invalid
+// global and make sure they get scanned/pulled again.
+func (db *schemaUpdater) migration17(prev int) error {
+	if prev < 16 {
+		// Issue was introduced in migration to 16
+		return nil
+	}
+	t, err := db.newReadOnlyTransaction()
+	if err != nil {
+		return err
+	}
+	defer t.close()
+
+	for _, folderStr := range db.ListFolders() {
+		folder := []byte(folderStr)
+		meta, err := db.loadMetadataTracker(folderStr)
+		if err != nil {
+			return err
+		}
+		batch := NewFileInfoBatch(func(fs []protocol.FileInfo) error {
+			return db.updateLocalFiles(folder, fs, meta)
+		})
+		var innerErr error
+		err = t.withHave(folder, protocol.LocalDeviceID[:], nil, false, func(fi protocol.FileIntf) bool {
+			if fi.IsInvalid() && fi.FileLocalFlags() == 0 {
+				f := fi.(protocol.FileInfo)
+				f.SetMustRescan()
+				f.Version = protocol.Vector{}
+				batch.Append(f)
+				innerErr = batch.FlushIfFull()
+				return innerErr == nil
+			}
+			return true
+		})
+		if innerErr != nil {
+			return innerErr
+		}
+		if err != nil {
+			return err
+		}
+		if err := batch.Flush(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (db *schemaUpdater) rewriteGlobals(t readWriteTransaction) error {
 	it, err := t.NewPrefixIterator([]byte{KeyTypeGlobal})
 	if err != nil {

lib/db/set_test.go

@@ -472,7 +472,6 @@ func TestNeedWithInvalid(t *testing.T) {
 		remote0Have[0],
 		remote1Have[0],
 		remote0Have[2],
-		remote1Have[2],
 	}
 
 	replace(s, protocol.LocalDeviceID, localHave)

lib/db/structs.pb.go

@@ -8,10 +8,10 @@ import (
 	_ "github.com/gogo/protobuf/gogoproto"
 	proto "github.com/gogo/protobuf/proto"
 	github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
-	_ "github.com/golang/protobuf/ptypes/timestamp"
 	github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
 	protocol "github.com/syncthing/syncthing/lib/protocol"
 	_ "github.com/syncthing/syncthing/proto/ext"
+	_ "google.golang.org/protobuf/types/known/timestamppb"
 	io "io"
 	math "math"
 	math_bits "math/bits"

lib/db/transactions.go

@@ -774,8 +774,10 @@ func (t readWriteTransaction) updateLocalNeed(keyBuf, folder, name []byte, add b
 }
 
 func Need(global FileVersion, haveLocal bool, localVersion protocol.Vector) bool {
-	// We never need a file without a valid version.
-	if global.Version.IsEmpty() {
+	// We never need an invalid file or a file without a valid version (just
+	// another way of expressing "invalid", really, until we fix that
+	// part...).
+	if global.IsInvalid() || global.Version.IsEmpty() {
 		return false
 	}
 	// We don't need a deleted file if we don't have it.

lib/db/util.go

@@ -0,0 +1,70 @@
+// Copyright (C) 2021 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 db
+
+import "github.com/syncthing/syncthing/lib/protocol"
+
+// How many files to send in each Index/IndexUpdate message.
+const (
+	MaxBatchSizeBytes = 250 * 1024 // Aim for making index messages no larger than 250 KiB (uncompressed)
+	MaxBatchSizeFiles = 1000       // Either way, don't include more files than this
+)
+
+// FileInfoBatch is a utility to do file operations on the database in suitably
+// sized batches.
+type FileInfoBatch struct {
+	infos   []protocol.FileInfo
+	size    int
+	flushFn func([]protocol.FileInfo) error
+}
+
+func NewFileInfoBatch(fn func([]protocol.FileInfo) error) *FileInfoBatch {
+	return &FileInfoBatch{
+		infos:   make([]protocol.FileInfo, 0, MaxBatchSizeFiles),
+		flushFn: fn,
+	}
+}
+
+func (b *FileInfoBatch) SetFlushFunc(fn func([]protocol.FileInfo) error) {
+	b.flushFn = fn
+}
+
+func (b *FileInfoBatch) Append(f protocol.FileInfo) {
+	b.infos = append(b.infos, f)
+	b.size += f.ProtoSize()
+}
+
+func (b *FileInfoBatch) Full() bool {
+	return len(b.infos) >= MaxBatchSizeFiles || b.size >= MaxBatchSizeBytes
+}
+
+func (b *FileInfoBatch) FlushIfFull() error {
+	if b.Full() {
+		return b.Flush()
+	}
+	return nil
+}
+
+func (b *FileInfoBatch) Flush() error {
+	if len(b.infos) == 0 {
+		return nil
+	}
+	if err := b.flushFn(b.infos); err != nil {
+		return err
+	}
+	b.Reset()
+	return nil
+}
+
+func (b *FileInfoBatch) Reset() {
+	b.infos = b.infos[:0]
+	b.size = 0
+}
+
+func (b *FileInfoBatch) Size() int {
+	return b.size
+}

lib/discover/manager.go

@@ -4,6 +4,7 @@
 // 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/.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
 //go:generate counterfeiter -o mocks/manager.go --fake-name Manager . Manager
 
 package discover

lib/events/events.go

@@ -4,6 +4,7 @@
 // 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/.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
 //go:generate counterfeiter -o mocks/buffered_subscription.go --fake-name BufferedSubscription . BufferedSubscription
 
 // Package events provides event subscription and polling functionality.

lib/fs/basicfs.go

@@ -330,6 +330,14 @@ func (f *BasicFilesystem) SameFile(fi1, fi2 FileInfo) bool {
 	return os.SameFile(f1.osFileInfo(), f2.osFileInfo())
 }
 
+func (f *BasicFilesystem) underlying() (Filesystem, bool) {
+	return nil, false
+}
+
+func (f *BasicFilesystem) wrapperType() filesystemWrapperType {
+	return filesystemWrapperTypeNone
+}
+
 // basicFile implements the fs.File interface on top of an os.File
 type basicFile struct {
 	*os.File

lib/fs/basicfs_watch_eventtypes_inotify.go

@@ -10,8 +10,9 @@ package fs
 
 import "github.com/syncthing/notify"
 
+// notify.InAttrib is not only required for permissions, but also mod. time changes
 const (
-	subEventMask  = notify.InCreate | notify.InMovedTo | notify.InDelete | notify.InDeleteSelf | notify.InModify | notify.InMovedFrom | notify.InMoveSelf
-	permEventMask = notify.InAttrib
+	subEventMask  = notify.InCreate | notify.InMovedTo | notify.InDelete | notify.InDeleteSelf | notify.InModify | notify.InMovedFrom | notify.InMoveSelf | notify.InAttrib
+	permEventMask = 0
 	rmEventMask   = notify.InDelete | notify.InDeleteSelf | notify.InMovedFrom | notify.InMoveSelf
 )

lib/fs/basicfs_watch_eventtypes_kqueue.go

@@ -13,7 +13,8 @@ import "github.com/syncthing/notify"
 const (
 	// Platform independent notify.Create is required, as kqueue does not have
 	// any event signalling file creation, but notify does generate those internally.
-	subEventMask  = notify.NoteDelete | notify.NoteWrite | notify.NoteRename | notify.Create
-	permEventMask = notify.NoteAttrib | notify.NoteExtend
+	// NoteAttrib is not only required for permissions, but also mod. time changes
+	subEventMask  = notify.NoteDelete | notify.NoteWrite | notify.NoteRename | notify.Create | notify.NoteAttrib | notify.NoteExtend
+	permEventMask = 0
 	rmEventMask   = notify.NoteDelete | notify.NoteRename
 )

lib/fs/basicfs_watch_test.go

@@ -87,7 +87,7 @@ func TestWatchIgnore(t *testing.T) {
 		{name, NonRemove},
 	}
 
-	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{ignore: filepath.Join(name, ignored), skipIgnoredDirs: true})
+	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{ignore: filepath.Join(name, ignored), skipIgnoredDirs: true}, false)
 }
 
 func TestWatchInclude(t *testing.T) {
@@ -114,7 +114,7 @@ func TestWatchInclude(t *testing.T) {
 		{name, NonRemove},
 	}
 
-	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{ignore: filepath.Join(name, ignored), include: filepath.Join(name, included)})
+	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{ignore: filepath.Join(name, ignored), include: filepath.Join(name, included)}, false)
 }
 
 func TestWatchRename(t *testing.T) {
@@ -146,7 +146,7 @@ func TestWatchRename(t *testing.T) {
 
 	// set the "allow others" flag because we might get the create of
 	// "oldfile" initially
-	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{})
+	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{}, false)
 }
 
 // TestWatchWinRoot checks that a watch at a drive letter does not panic due to
@@ -308,7 +308,7 @@ func TestWatchOverflow(t *testing.T) {
 		}
 	}
 
-	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{})
+	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{}, false)
 }
 
 func TestWatchErrorLinuxInterpretation(t *testing.T) {
@@ -413,7 +413,39 @@ func TestWatchIssue4877(t *testing.T) {
 		testFs = origTestFs
 	}()
 
-	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{})
+	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{}, false)
+}
+
+func TestWatchModTime(t *testing.T) {
+	name := "modtime"
+
+	file := createTestFile(name, "foo")
+	path := filepath.Join(name, file)
+	now := time.Now()
+	before := now.Add(-10 * time.Second)
+	if err := testFs.Chtimes(path, before, before); err != nil {
+		t.Fatal(err)
+	}
+
+	testCase := func() {
+		if err := testFs.Chtimes(path, now, now); err != nil {
+			t.Error(err)
+		}
+	}
+
+	expectedEvents := []Event{
+		{file, NonRemove},
+	}
+
+	var allowedEvents []Event
+	// Apparently an event for the parent is also sent on mac
+	if runtime.GOOS == "darwin" {
+		allowedEvents = []Event{
+			{name, NonRemove},
+		}
+	}
+
+	testScenario(t, name, testCase, expectedEvents, allowedEvents, fakeMatcher{}, true)
 }
 
 // path relative to folder root, also creates parent dirs if necessary
@@ -442,7 +474,7 @@ func sleepMs(ms int) {
 	time.Sleep(time.Duration(ms) * time.Millisecond)
 }
 
-func testScenario(t *testing.T, name string, testCase func(), expectedEvents, allowedEvents []Event, fm fakeMatcher) {
+func testScenario(t *testing.T, name string, testCase func(), expectedEvents, allowedEvents []Event, fm fakeMatcher, ignorePerms bool) {
 	if err := testFs.MkdirAll(name, 0755); err != nil {
 		panic(fmt.Sprintf("Failed to create directory %s: %s", name, err))
 	}
@@ -451,7 +483,7 @@ func testScenario(t *testing.T, name string, testCase func(), expectedEvents, al
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	eventChan, errChan, err := testFs.Watch(name, fm, ctx, false)
+	eventChan, errChan, err := testFs.Watch(name, fm, ctx, ignorePerms)
 	if err != nil {
 		panic(err)
 	}

lib/fs/casefs.go

@@ -339,6 +339,14 @@ func (f *caseFilesystem) Unhide(name string) error {
 	return f.Filesystem.Unhide(name)
 }
 
+func (f *caseFilesystem) underlying() (Filesystem, bool) {
+	return f.Filesystem, true
+}
+
+func (f *caseFilesystem) wrapperType() filesystemWrapperType {
+	return filesystemWrapperTypeCase
+}
+
 func (f *caseFilesystem) checkCase(name string) error {
 	var err error
 	if name, err = Canonicalize(name); err != nil {

lib/fs/casefs_test.go

@@ -161,7 +161,10 @@ func BenchmarkWalkCaseFakeFS100k(b *testing.B) {
 		b.Fatal(err)
 	}
 	b.Run("rawfs", func(b *testing.B) {
-		fakefs := unwrapFilesystem(fsys).(*fakefs)
+		var fakefs *fakeFS
+		if ffs, ok := unwrapFilesystem(fsys, filesystemWrapperTypeNone); ok {
+			fakefs = ffs.(*fakeFS)
+		}
 		fakefs.resetCounters()
 		benchmarkWalkFakeFS(b, fsys, paths, 0, "")
 		fakefs.reportMetricsPerOp(b)
@@ -174,7 +177,10 @@ func BenchmarkWalkCaseFakeFS100k(b *testing.B) {
 			Filesystem: fsys,
 			realCaser:  newDefaultRealCaser(fsys),
 		}
-		fakefs := unwrapFilesystem(fsys).(*fakefs)
+		var fakefs *fakeFS
+		if ffs, ok := unwrapFilesystem(fsys, filesystemWrapperTypeNone); ok {
+			fakefs = ffs.(*fakeFS)
+		}
 		fakefs.resetCounters()
 		benchmarkWalkFakeFS(b, casefs, paths, 0, "")
 		fakefs.reportMetricsPerOp(b)
@@ -197,7 +203,10 @@ func BenchmarkWalkCaseFakeFS100k(b *testing.B) {
 			Filesystem: fsys,
 			realCaser:  newDefaultRealCaser(fsys),
 		}
-		fakefs := unwrapFilesystem(fsys).(*fakefs)
+		var fakefs *fakeFS
+		if ffs, ok := unwrapFilesystem(fsys, filesystemWrapperTypeNone); ok {
+			fakefs = ffs.(*fakeFS)
+		}
 		fakefs.resetCounters()
 		benchmarkWalkFakeFS(b, casefs, paths, otherOpEvery, otherOpPath)
 		fakefs.reportMetricsPerOp(b)

lib/fs/debug_symlink_unix.go

@@ -18,7 +18,8 @@ import (
 // reason for existence is the Windows version, which allows creating
 // symlinks when non-elevated.
 func DebugSymlinkForTestsOnly(oldFs, newFs Filesystem, oldname, newname string) error {
-	if caseFs, ok := unwrapFilesystem(newFs).(*caseFilesystem); ok {
+	if fs, ok := unwrapFilesystem(newFs, filesystemWrapperTypeCase); ok {
+		caseFs := fs.(*caseFilesystem)
 		if err := caseFs.checkCase(newname); err != nil {
 			return err
 		}

lib/fs/errorfs.go

@@ -52,3 +52,11 @@ func (fs *errorFilesystem) SameFile(fi1, fi2 FileInfo) bool { return false }
 func (fs *errorFilesystem) Watch(path string, ignore Matcher, ctx context.Context, ignorePerms bool) (<-chan Event, <-chan error, error) {
 	return nil, nil, fs.err
 }
+
+func (fs *errorFilesystem) underlying() (Filesystem, bool) {
+	return nil, false
+}
+
+func (fs *errorFilesystem) wrapperType() filesystemWrapperType {
+	return filesystemWrapperTypeError
+}

lib/fs/fakefs.go

@@ -27,7 +27,7 @@ import (
 // see readShortAt()
 const randomBlockShift = 14 // 128k
 
-// fakefs is a fake filesystem for testing and benchmarking. It has the
+// fakeFS is a fake filesystem for testing and benchmarking. It has the
 // following properties:
 //
 // - File metadata is kept in RAM. Specifically, we remember which files and
@@ -37,7 +37,7 @@ const randomBlockShift = 14 // 128k
 // - File contents are generated pseudorandomly with just the file name as
 //   seed. Writes are discarded, other than having the effect of increasing
 //   the file size. If you only write data that you've read from a file with
-//   the same name on a different fakefs, you'll never know the difference...
+//   the same name on a different fakeFS, you'll never know the difference...
 //
 // - We totally ignore permissions - pretend you are root.
 //
@@ -51,10 +51,10 @@ const randomBlockShift = 14 // 128k
 //     insens=b   "true" makes filesystem case-insensitive Windows- or OSX-style (default false)
 //     latency=d  to set the amount of time each "disk" operation takes, where d is time.ParseDuration format
 //
-// - Two fakefs:s pointing at the same root path see the same files.
+// - Two fakeFS:s pointing at the same root path see the same files.
 //
-type fakefs struct {
-	counters    fakefsCounters
+type fakeFS struct {
+	counters    fakeFSCounters
 	uri         string
 	mut         sync.Mutex
 	root        *fakeEntry
@@ -63,7 +63,7 @@ type fakefs struct {
 	latency     time.Duration
 }
 
-type fakefsCounters struct {
+type fakeFSCounters struct {
 	Chmod       int64
 	Lchown      int64
 	Chtimes     int64
@@ -81,13 +81,13 @@ type fakefsCounters struct {
 }
 
 var (
-	fakefsMut sync.Mutex
-	fakefsFs  = make(map[string]*fakefs)
+	fakeFSMut   sync.Mutex
+	fakeFSCache = make(map[string]*fakeFS)
 )
 
-func newFakeFilesystem(rootURI string, _ ...Option) *fakefs {
-	fakefsMut.Lock()
-	defer fakefsMut.Unlock()
+func newFakeFilesystem(rootURI string, _ ...Option) *fakeFS {
+	fakeFSMut.Lock()
+	defer fakeFSMut.Unlock()
 
 	root := rootURI
 	var params url.Values
@@ -97,12 +97,12 @@ func newFakeFilesystem(rootURI string, _ ...Option) *fakefs {
 		params = uri.Query()
 	}
 
-	if fs, ok := fakefsFs[rootURI]; ok {
+	if fs, ok := fakeFSCache[rootURI]; ok {
 		// Already have an fs at this path
 		return fs
 	}
 
-	fs := &fakefs{
+	fs := &fakeFS{
 		uri: "fake://" + rootURI,
 		root: &fakeEntry{
 			name:      "/",
@@ -157,7 +157,7 @@ func newFakeFilesystem(rootURI string, _ ...Option) *fakefs {
 	// the filesystem initially.
 	fs.latency, _ = time.ParseDuration(params.Get("latency"))
 
-	fakefsFs[root] = fs
+	fakeFSCache[root] = fs
 	return fs
 }
 
@@ -183,7 +183,7 @@ type fakeEntry struct {
 	content   []byte
 }
 
-func (fs *fakefs) entryForName(name string) *fakeEntry {
+func (fs *fakeFS) entryForName(name string) *fakeEntry {
 	// bug: lookup doesn't work through symlinks.
 	if fs.insens {
 		name = UnicodeLowercase(name)
@@ -210,7 +210,7 @@ func (fs *fakefs) entryForName(name string) *fakeEntry {
 	return entry
 }
 
-func (fs *fakefs) Chmod(name string, mode FileMode) error {
+func (fs *fakeFS) Chmod(name string, mode FileMode) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Chmod++
@@ -223,7 +223,7 @@ func (fs *fakefs) Chmod(name string, mode FileMode) error {
 	return nil
 }
 
-func (fs *fakefs) Lchown(name string, uid, gid int) error {
+func (fs *fakeFS) Lchown(name string, uid, gid int) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Lchown++
@@ -237,7 +237,7 @@ func (fs *fakefs) Lchown(name string, uid, gid int) error {
 	return nil
 }
 
-func (fs *fakefs) Chtimes(name string, atime time.Time, mtime time.Time) error {
+func (fs *fakeFS) Chtimes(name string, atime time.Time, mtime time.Time) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Chtimes++
@@ -250,7 +250,7 @@ func (fs *fakefs) Chtimes(name string, atime time.Time, mtime time.Time) error {
 	return nil
 }
 
-func (fs *fakefs) create(name string) (*fakeEntry, error) {
+func (fs *fakeFS) create(name string) (*fakeEntry, error) {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Create++
@@ -296,7 +296,7 @@ func (fs *fakefs) create(name string) (*fakeEntry, error) {
 	return new, nil
 }
 
-func (fs *fakefs) Create(name string) (File, error) {
+func (fs *fakeFS) Create(name string) (File, error) {
 	entry, err := fs.create(name)
 	if err != nil {
 		return nil, err
@@ -307,7 +307,7 @@ func (fs *fakefs) Create(name string) (File, error) {
 	return &fakeFile{fakeEntry: entry}, nil
 }
 
-func (fs *fakefs) CreateSymlink(target, name string) error {
+func (fs *fakeFS) CreateSymlink(target, name string) error {
 	entry, err := fs.create(name)
 	if err != nil {
 		return err
@@ -317,7 +317,7 @@ func (fs *fakefs) CreateSymlink(target, name string) error {
 	return nil
 }
 
-func (fs *fakefs) DirNames(name string) ([]string, error) {
+func (fs *fakeFS) DirNames(name string) ([]string, error) {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.DirNames++
@@ -336,7 +336,7 @@ func (fs *fakefs) DirNames(name string) ([]string, error) {
 	return names, nil
 }
 
-func (fs *fakefs) Lstat(name string) (FileInfo, error) {
+func (fs *fakeFS) Lstat(name string) (FileInfo, error) {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Lstat++
@@ -355,7 +355,7 @@ func (fs *fakefs) Lstat(name string) (FileInfo, error) {
 	return info, nil
 }
 
-func (fs *fakefs) Mkdir(name string, perm FileMode) error {
+func (fs *fakeFS) Mkdir(name string, perm FileMode) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Mkdir++
@@ -389,7 +389,7 @@ func (fs *fakefs) Mkdir(name string, perm FileMode) error {
 	return nil
 }
 
-func (fs *fakefs) MkdirAll(name string, perm FileMode) error {
+func (fs *fakeFS) MkdirAll(name string, perm FileMode) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.MkdirAll++
@@ -426,7 +426,7 @@ func (fs *fakefs) MkdirAll(name string, perm FileMode) error {
 	return nil
 }
 
-func (fs *fakefs) Open(name string) (File, error) {
+func (fs *fakeFS) Open(name string) (File, error) {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Open++
@@ -443,7 +443,7 @@ func (fs *fakefs) Open(name string) (File, error) {
 	return &fakeFile{fakeEntry: entry}, nil
 }
 
-func (fs *fakefs) OpenFile(name string, flags int, mode FileMode) (File, error) {
+func (fs *fakeFS) OpenFile(name string, flags int, mode FileMode) (File, error) {
 	if flags&os.O_CREATE == 0 {
 		return fs.Open(name)
 	}
@@ -486,7 +486,7 @@ func (fs *fakefs) OpenFile(name string, flags int, mode FileMode) (File, error)
 	return &fakeFile{fakeEntry: newEntry}, nil
 }
 
-func (fs *fakefs) ReadSymlink(name string) (string, error) {
+func (fs *fakeFS) ReadSymlink(name string) (string, error) {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.ReadSymlink++
@@ -501,7 +501,7 @@ func (fs *fakefs) ReadSymlink(name string) (string, error) {
 	return entry.dest, nil
 }
 
-func (fs *fakefs) Remove(name string) error {
+func (fs *fakeFS) Remove(name string) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Remove++
@@ -524,7 +524,7 @@ func (fs *fakefs) Remove(name string) error {
 	return nil
 }
 
-func (fs *fakefs) RemoveAll(name string) error {
+func (fs *fakeFS) RemoveAll(name string) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.RemoveAll++
@@ -536,7 +536,7 @@ func (fs *fakefs) RemoveAll(name string) error {
 
 	entry := fs.entryForName(filepath.Dir(name))
 	if entry == nil {
-		return nil // all tested real systems exibit this behaviour
+		return nil // all tested real systems exhibit this behaviour
 	}
 
 	// RemoveAll is easy when the file system uses garbage collection under
@@ -545,7 +545,7 @@ func (fs *fakefs) RemoveAll(name string) error {
 	return nil
 }
 
-func (fs *fakefs) Rename(oldname, newname string) error {
+func (fs *fakeFS) Rename(oldname, newname string) error {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	fs.counters.Rename++
@@ -595,56 +595,56 @@ func (fs *fakefs) Rename(oldname, newname string) error {
 	return nil
 }
 
-func (fs *fakefs) Stat(name string) (FileInfo, error) {
+func (fs *fakeFS) Stat(name string) (FileInfo, error) {
 	return fs.Lstat(name)
 }
 
-func (fs *fakefs) SymlinksSupported() bool {
+func (fs *fakeFS) SymlinksSupported() bool {
 	return false
 }
 
-func (fs *fakefs) Walk(name string, walkFn WalkFunc) error {
+func (fs *fakeFS) Walk(name string, walkFn WalkFunc) error {
 	return errors.New("not implemented")
 }
 
-func (fs *fakefs) Watch(path string, ignore Matcher, ctx context.Context, ignorePerms bool) (<-chan Event, <-chan error, error) {
+func (fs *fakeFS) Watch(path string, ignore Matcher, ctx context.Context, ignorePerms bool) (<-chan Event, <-chan error, error) {
 	return nil, nil, ErrWatchNotSupported
 }
 
-func (fs *fakefs) Hide(name string) error {
+func (fs *fakeFS) Hide(name string) error {
 	return nil
 }
 
-func (fs *fakefs) Unhide(name string) error {
+func (fs *fakeFS) Unhide(name string) error {
 	return nil
 }
 
-func (fs *fakefs) Glob(pattern string) ([]string, error) {
+func (fs *fakeFS) Glob(pattern string) ([]string, error) {
 	// gnnh we don't seem to actually require this in practice
 	return nil, errors.New("not implemented")
 }
 
-func (fs *fakefs) Roots() ([]string, error) {
+func (fs *fakeFS) Roots() ([]string, error) {
 	return []string{"/"}, nil
 }
 
-func (fs *fakefs) Usage(name string) (Usage, error) {
+func (fs *fakeFS) Usage(name string) (Usage, error) {
 	return Usage{}, errors.New("not implemented")
 }
 
-func (fs *fakefs) Type() FilesystemType {
+func (fs *fakeFS) Type() FilesystemType {
 	return FilesystemTypeFake
 }
 
-func (fs *fakefs) URI() string {
+func (fs *fakeFS) URI() string {
 	return fs.uri
 }
 
-func (fs *fakefs) Options() []Option {
+func (fs *fakeFS) Options() []Option {
 	return nil
 }
 
-func (fs *fakefs) SameFile(fi1, fi2 FileInfo) bool {
+func (fs *fakeFS) SameFile(fi1, fi2 FileInfo) bool {
 	// BUG: real systems base file sameness on path, inodes, etc
 	// we try our best, but FileInfo just doesn't have enough data
 	// so there be false positives, especially on Windows
@@ -659,17 +659,25 @@ func (fs *fakefs) SameFile(fi1, fi2 FileInfo) bool {
 	return ok && fi1.ModTime().Equal(fi2.ModTime()) && fi1.Mode() == fi2.Mode() && fi1.IsDir() == fi2.IsDir() && fi1.IsRegular() == fi2.IsRegular() && fi1.IsSymlink() == fi2.IsSymlink() && fi1.Owner() == fi2.Owner() && fi1.Group() == fi2.Group()
 }
 
-func (fs *fakefs) resetCounters() {
+func (fs *fakeFS) underlying() (Filesystem, bool) {
+	return nil, false
+}
+
+func (fs *fakeFS) wrapperType() filesystemWrapperType {
+	return filesystemWrapperTypeNone
+}
+
+func (fs *fakeFS) resetCounters() {
 	fs.mut.Lock()
-	fs.counters = fakefsCounters{}
+	fs.counters = fakeFSCounters{}
 	fs.mut.Unlock()
 }
 
-func (fs *fakefs) reportMetricsPerOp(b *testing.B) {
+func (fs *fakeFS) reportMetricsPerOp(b *testing.B) {
 	fs.reportMetricsPer(b, 1, "op")
 }
 
-func (fs *fakefs) reportMetricsPer(b *testing.B, divisor float64, unit string) {
+func (fs *fakeFS) reportMetricsPer(b *testing.B, divisor float64, unit string) {
 	fs.mut.Lock()
 	defer fs.mut.Unlock()
 	b.ReportMetric(float64(fs.counters.Lstat)/divisor/float64(b.N), "Lstat/"+unit)

lib/fs/fakefs_test.go

@@ -21,7 +21,7 @@ import (
 )
 
 func TestFakeFS(t *testing.T) {
-	// Test some basic aspects of the fakefs
+	// Test some basic aspects of the fakeFS
 
 	fs := newFakeFilesystem("/foo/bar/baz")
 
@@ -131,7 +131,7 @@ func TestFakeFS(t *testing.T) {
 }
 
 func testFakeFSRead(t *testing.T, fs Filesystem) {
-	// Test some basic aspects of the fakefs
+	// Test some basic aspects of the fakeFS
 	// Create
 	fd, _ := fs.Create("test")
 	defer fd.Close()
@@ -201,7 +201,7 @@ func TestFakeFSCaseSensitive(t *testing.T) {
 		{"FileName", testFakeFSFileName},
 	}
 	var filesystems = []testFS{
-		{"fakefs", newFakeFilesystem("/foo")},
+		{"fakeFS", newFakeFilesystem("/foo")},
 	}
 
 	testDir, sensitive := createTestDir(t)
@@ -237,7 +237,7 @@ func TestFakeFSCaseInsensitive(t *testing.T) {
 	}
 
 	var filesystems = []testFS{
-		{"fakefs", newFakeFilesystem("/foobar?insens=true")},
+		{"fakeFS", newFakeFilesystem("/foobar?insens=true")},
 	}
 
 	testDir, sensitive := createTestDir(t)
@@ -891,7 +891,7 @@ func testFakeFSCreateInsens(t *testing.T, fs Filesystem) {
 		t.Errorf("name of created file \"fOo\" is %s", fd2.Name())
 	}
 
-	// one would expect DirNames to show the last variant, but in fact it shows
+	// one would expect DirNames to show the last wrapperType, but in fact it shows
 	// the original one
 	assertDir(t, fs, "/", []string{"FOO"})
 }

lib/fs/filesystem.go

@@ -16,6 +16,17 @@ import (
 	"time"
 )
 
+type filesystemWrapperType int32
+
+const (
+	filesystemWrapperTypeNone filesystemWrapperType = iota
+	filesystemWrapperTypeMtime
+	filesystemWrapperTypeCase
+	filesystemWrapperTypeError
+	filesystemWrapperTypeWalk
+	filesystemWrapperTypeLog
+)
+
 // The Filesystem interface abstracts access to the file system.
 type Filesystem interface {
 	Chmod(name string, mode FileMode) error
@@ -49,6 +60,10 @@ type Filesystem interface {
 	URI() string
 	Options() []Option
 	SameFile(fi1, fi2 FileInfo) bool
+
+	// Used for unwrapping things
+	underlying() (Filesystem, bool)
+	wrapperType() filesystemWrapperType
 }
 
 // The File interface abstracts access to a regular file, being a somewhat
@@ -284,18 +299,16 @@ func wrapFilesystem(fs Filesystem, wrapFn func(Filesystem) Filesystem) Filesyste
 	return fs
 }
 
-// unwrapFilesystem removes "wrapping" filesystems to expose the underlying filesystem.
-func unwrapFilesystem(fs Filesystem) Filesystem {
+// unwrapFilesystem removes "wrapping" filesystems to expose the filesystem of the requested wrapperType, if it exists.
+func unwrapFilesystem(fs Filesystem, wrapperType filesystemWrapperType) (Filesystem, bool) {
+	var ok bool
 	for {
-		switch sfs := fs.(type) {
-		case *logFilesystem:
-			fs = sfs.Filesystem
-		case *walkFilesystem:
-			fs = sfs.Filesystem
-		case *mtimeFS:
-			fs = sfs.Filesystem
-		default:
-			return sfs
+		if fs.wrapperType() == wrapperType {
+			return fs, true
+		}
+		fs, ok = fs.underlying()
+		if !ok {
+			return nil, false
 		}
 	}
 }

lib/fs/logfs.go

@@ -163,3 +163,11 @@ func (fs *logFilesystem) Usage(name string) (Usage, error) {
 	l.Debugln(getCaller(), fs.Type(), fs.URI(), "Usage", name, usage, err)
 	return usage, err
 }
+
+func (fs *logFilesystem) underlying() (Filesystem, bool) {
+	return fs.Filesystem, true
+}
+
+func (fs *logFilesystem) wrapperType() filesystemWrapperType {
+	return filesystemWrapperTypeLog
+}

lib/fs/mtimefs.go

@@ -7,6 +7,7 @@
 package fs
 
 import (
+	"errors"
 	"time"
 )
 
@@ -69,14 +70,14 @@ func (f *mtimeFS) Stat(name string) (FileInfo, error) {
 		return nil, err
 	}
 
-	real, virtual, err := f.load(name)
+	mtimeMapping, err := f.load(name)
 	if err != nil {
 		return nil, err
 	}
-	if real == info.ModTime() {
+	if mtimeMapping.Real == info.ModTime() {
 		info = mtimeFileInfo{
 			FileInfo: info,
-			mtime:    virtual,
+			mtime:    mtimeMapping.Virtual,
 		}
 	}
 
@@ -89,14 +90,14 @@ func (f *mtimeFS) Lstat(name string) (FileInfo, error) {
 		return nil, err
 	}
 
-	real, virtual, err := f.load(name)
+	mtimeMapping, err := f.load(name)
 	if err != nil {
 		return nil, err
 	}
-	if real == info.ModTime() {
+	if mtimeMapping.Real == info.ModTime() {
 		info = mtimeFileInfo{
 			FileInfo: info,
-			mtime:    virtual,
+			mtime:    mtimeMapping.Virtual,
 		}
 	}
 
@@ -106,15 +107,15 @@ func (f *mtimeFS) Lstat(name string) (FileInfo, error) {
 func (f *mtimeFS) Walk(root string, walkFn WalkFunc) error {
 	return f.Filesystem.Walk(root, func(path string, info FileInfo, err error) error {
 		if info != nil {
-			real, virtual, loadErr := f.load(path)
+			mtimeMapping, loadErr := f.load(path)
 			if loadErr != nil && err == nil {
 				// The iterator gets to deal with the error
 				err = loadErr
 			}
-			if real == info.ModTime() {
+			if mtimeMapping.Real == info.ModTime() {
 				info = mtimeFileInfo{
 					FileInfo: info,
-					mtime:    virtual,
+					mtime:    mtimeMapping.Virtual,
 				}
 			}
 		}
@@ -146,8 +147,13 @@ func (f *mtimeFS) OpenFile(name string, flags int, mode FileMode) (File, error)
 	return mtimeFile{fd, f}, nil
 }
 
-// "real" is the on disk timestamp
-// "virtual" is what want the timestamp to be
+func (f *mtimeFS) underlying() (Filesystem, bool) {
+	return f.Filesystem, true
+}
+
+func (f *mtimeFS) wrapperType() filesystemWrapperType {
+	return filesystemWrapperTypeMtime
+}
 
 func (f *mtimeFS) save(name string, real, virtual time.Time) {
 	if f.caseInsensitive {
@@ -161,32 +167,31 @@ func (f *mtimeFS) save(name string, real, virtual time.Time) {
 		return
 	}
 
-	mtime := dbMtime{
-		real:    real,
-		virtual: virtual,
+	mtime := MtimeMapping{
+		Real:    real,
+		Virtual: virtual,
 	}
 	bs, _ := mtime.Marshal() // Can't fail
 	f.db.PutBytes(name, bs)
 }
 
-func (f *mtimeFS) load(name string) (real, virtual time.Time, err error) {
+func (f *mtimeFS) load(name string) (MtimeMapping, error) {
 	if f.caseInsensitive {
 		name = UnicodeLowercase(name)
 	}
 
 	data, exists, err := f.db.Bytes(name)
 	if err != nil {
-		return time.Time{}, time.Time{}, err
+		return MtimeMapping{}, err
 	} else if !exists {
-		return time.Time{}, time.Time{}, nil
+		return MtimeMapping{}, nil
 	}
 
-	var mtime dbMtime
+	var mtime MtimeMapping
 	if err := mtime.Unmarshal(data); err != nil {
-		return time.Time{}, time.Time{}, err
+		return MtimeMapping{}, err
 	}
-
-	return mtime.real, mtime.virtual, nil
+	return mtime, nil
 }
 
 // The mtimeFileInfo is an os.FileInfo that lies about the ModTime().
@@ -211,43 +216,57 @@ func (f mtimeFile) Stat() (FileInfo, error) {
 		return nil, err
 	}
 
-	real, virtual, err := f.fs.load(f.Name())
+	mtimeMapping, err := f.fs.load(f.Name())
 	if err != nil {
 		return nil, err
 	}
-	if real == info.ModTime() {
+	if mtimeMapping.Real == info.ModTime() {
 		info = mtimeFileInfo{
 			FileInfo: info,
-			mtime:    virtual,
+			mtime:    mtimeMapping.Virtual,
 		}
 	}
 
 	return info, nil
 }
 
+// Used by copyRange to unwrap to the real file and access SyscallConn
 func (f mtimeFile) unwrap() File {
 	return f.File
 }
 
-// The dbMtime is our database representation
-
-type dbMtime struct {
-	real    time.Time
-	virtual time.Time
+// MtimeMapping represents the mapping as stored in the database
+type MtimeMapping struct {
+	// "Real" is the on disk timestamp
+	Real time.Time `json:"real"`
+	// "Virtual" is what want the timestamp to be
+	Virtual time.Time `json:"virtual"`
 }
 
-func (t *dbMtime) Marshal() ([]byte, error) {
-	bs0, _ := t.real.MarshalBinary()
-	bs1, _ := t.virtual.MarshalBinary()
+func (t *MtimeMapping) Marshal() ([]byte, error) {
+	bs0, _ := t.Real.MarshalBinary()
+	bs1, _ := t.Virtual.MarshalBinary()
 	return append(bs0, bs1...), nil
 }
 
-func (t *dbMtime) Unmarshal(bs []byte) error {
-	if err := t.real.UnmarshalBinary(bs[:len(bs)/2]); err != nil {
+func (t *MtimeMapping) Unmarshal(bs []byte) error {
+	if err := t.Real.UnmarshalBinary(bs[:len(bs)/2]); err != nil {
 		return err
 	}
-	if err := t.virtual.UnmarshalBinary(bs[len(bs)/2:]); err != nil {
+	if err := t.Virtual.UnmarshalBinary(bs[len(bs)/2:]); err != nil {
 		return err
 	}
 	return nil
 }
+
+func GetMtimeMapping(fs Filesystem, file string) (MtimeMapping, error) {
+	fs, ok := unwrapFilesystem(fs, filesystemWrapperTypeMtime)
+	if !ok {
+		return MtimeMapping{}, errors.New("failed to unwrap")
+	}
+	mtimeFs, ok := fs.(*mtimeFS)
+	if !ok {
+		return MtimeMapping{}, errors.New("unwrapping failed")
+	}
+	return mtimeFs.load(file)
+}

lib/fs/walkfs.go

@@ -149,3 +149,11 @@ func (f *walkFilesystem) Walk(root string, walkFn WalkFunc) error {
 	}
 	return f.walk(root, info, walkFn, ancestors)
 }
+
+func (f *walkFilesystem) underlying() (Filesystem, bool) {
+	return f.Filesystem, true
+}
+
+func (f *walkFilesystem) wrapperType() filesystemWrapperType {
+	return filesystemWrapperTypeWalk
+}

lib/logger/logger.go

@@ -1,6 +1,7 @@
 // Copyright (C) 2014 Jakob Borg. All rights reserved. Use of this source code
 // is governed by an MIT-style license that can be found in the LICENSE file.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
 //go:generate counterfeiter -o mocks/logger.go --fake-name Recorder . Recorder
 
 // Package logger implements a standardized logger with callback functionality

lib/model/folder.go

@@ -473,7 +473,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 	f.setState(FolderScanning)
 	f.clearScanErrors(subDirs)
 
-	batch := newFileInfoBatch(func(fs []protocol.FileInfo) error {
+	batch := db.NewFileInfoBatch(func(fs []protocol.FileInfo) error {
 		if err := f.getHealthErrorWithoutIgnores(); err != nil {
 			l.Debugf("Stopping scan of folder %s due to: %s", f.Description(), err)
 			return err
@@ -500,7 +500,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 		return err
 	}
 
-	if err := batch.flush(); err != nil {
+	if err := batch.Flush(); err != nil {
 		return err
 	}
 
@@ -519,7 +519,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 		return err
 	}
 
-	if err := batch.flush(); err != nil {
+	if err := batch.Flush(); err != nil {
 		return err
 	}
 
@@ -529,7 +529,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 
 type batchAppendFunc func(protocol.FileInfo, *db.Snapshot) bool
 
-func (f *folder) scanSubdirsBatchAppendFunc(batch *fileInfoBatch) batchAppendFunc {
+func (f *folder) scanSubdirsBatchAppendFunc(batch *db.FileInfoBatch) batchAppendFunc {
 	// Resolve items which are identical with the global state.
 	switch f.Type {
 	case config.FolderTypeReceiveOnly:
@@ -550,7 +550,7 @@ func (f *folder) scanSubdirsBatchAppendFunc(batch *fileInfoBatch) batchAppendFun
 				l.Debugf("%v scanning: Marking item as not locally changed", f, fi)
 				fi.LocalFlags &^= protocol.FlagLocalReceiveOnly
 			}
-			batch.append(fi)
+			batch.Append(fi)
 			return true
 		}
 	case config.FolderTypeReceiveEncrypted:
@@ -567,18 +567,18 @@ func (f *folder) scanSubdirsBatchAppendFunc(batch *fileInfoBatch) batchAppendFun
 			// Any local change must not be sent as index entry to
 			// remotes and show up as an error in the UI.
 			fi.LocalFlags = protocol.FlagLocalReceiveOnly
-			batch.append(fi)
+			batch.Append(fi)
 			return true
 		}
 	default:
 		return func(fi protocol.FileInfo, _ *db.Snapshot) bool {
-			batch.append(fi)
+			batch.Append(fi)
 			return true
 		}
 	}
 }
 
-func (f *folder) scanSubdirsChangedAndNew(subDirs []string, batch *fileInfoBatch, batchAppend batchAppendFunc) (int, error) {
+func (f *folder) scanSubdirsChangedAndNew(subDirs []string, batch *db.FileInfoBatch, batchAppend batchAppendFunc) (int, error) {
 	changes := 0
 	snap, err := f.dbSnapshot()
 	if err != nil {
@@ -621,7 +621,7 @@ func (f *folder) scanSubdirsChangedAndNew(subDirs []string, batch *fileInfoBatch
 			continue
 		}
 
-		if err := batch.flushIfFull(); err != nil {
+		if err := batch.FlushIfFull(); err != nil {
 			// Prevent a race between the scan aborting due to context
 			// cancellation and releasing the snapshot in defer here.
 			scanCancel()
@@ -648,7 +648,7 @@ func (f *folder) scanSubdirsChangedAndNew(subDirs []string, batch *fileInfoBatch
 	return changes, nil
 }
 
-func (f *folder) scanSubdirsDeletedAndIgnored(subDirs []string, batch *fileInfoBatch, batchAppend batchAppendFunc) (int, error) {
+func (f *folder) scanSubdirsDeletedAndIgnored(subDirs []string, batch *db.FileInfoBatch, batchAppend batchAppendFunc) (int, error) {
 	var toIgnore []db.FileInfoTruncated
 	ignoredParent := ""
 	changes := 0
@@ -670,7 +670,7 @@ func (f *folder) scanSubdirsDeletedAndIgnored(subDirs []string, batch *fileInfoB
 
 			file := fi.(db.FileInfoTruncated)
 
-			if err := batch.flushIfFull(); err != nil {
+			if err := batch.FlushIfFull(); err != nil {
 				iterError = err
 				return false
 			}
@@ -682,7 +682,7 @@ func (f *folder) scanSubdirsDeletedAndIgnored(subDirs []string, batch *fileInfoB
 					if batchAppend(nf, snap) {
 						changes++
 					}
-					if err := batch.flushIfFull(); err != nil {
+					if err := batch.FlushIfFull(); err != nil {
 						iterError = err
 						return false
 					}
@@ -775,7 +775,7 @@ func (f *folder) scanSubdirsDeletedAndIgnored(subDirs []string, batch *fileInfoB
 				if batchAppend(nf, snap) {
 					changes++
 				}
-				if iterError = batch.flushIfFull(); iterError != nil {
+				if iterError = batch.FlushIfFull(); iterError != nil {
 					break
 				}
 			}
@@ -1206,7 +1206,7 @@ func (f *folder) handleForcedRescans() error {
 		return nil
 	}
 
-	batch := newFileInfoBatch(func(fs []protocol.FileInfo) error {
+	batch := db.NewFileInfoBatch(func(fs []protocol.FileInfo) error {
 		f.fset.Update(protocol.LocalDeviceID, fs)
 		return nil
 	})
@@ -1218,7 +1218,7 @@ func (f *folder) handleForcedRescans() error {
 	defer snap.Release()
 
 	for _, path := range paths {
-		if err := batch.flushIfFull(); err != nil {
+		if err := batch.FlushIfFull(); err != nil {
 			return err
 		}
 
@@ -1227,10 +1227,10 @@ func (f *folder) handleForcedRescans() error {
 			continue
 		}
 		fi.SetMustRescan()
-		batch.append(fi)
+		batch.Append(fi)
 	}
 
-	if err = batch.flush(); err != nil {
+	if err = batch.Flush(); err != nil {
 		return err
 	}
 

lib/model/folder_recvenc.go

@@ -41,7 +41,7 @@ func (f *receiveEncryptedFolder) revert() error {
 	f.setState(FolderScanning)
 	defer f.setState(FolderIdle)
 
-	batch := newFileInfoBatch(func(fs []protocol.FileInfo) error {
+	batch := db.NewFileInfoBatch(func(fs []protocol.FileInfo) error {
 		f.updateLocalsFromScanning(fs)
 		return nil
 	})
@@ -54,7 +54,7 @@ func (f *receiveEncryptedFolder) revert() error {
 	var iterErr error
 	var dirs []string
 	snap.WithHaveTruncated(protocol.LocalDeviceID, func(intf protocol.FileIntf) bool {
-		if iterErr = batch.flushIfFull(); iterErr != nil {
+		if iterErr = batch.FlushIfFull(); iterErr != nil {
 			return false
 		}
 
@@ -81,7 +81,7 @@ func (f *receiveEncryptedFolder) revert() error {
 		// item should still not be sent in index updates. However being
 		// deleted, it will not show up as an unexpected file in the UI
 		// anymore.
-		batch.append(fi)
+		batch.Append(fi)
 
 		return true
 	})
@@ -91,7 +91,7 @@ func (f *receiveEncryptedFolder) revert() error {
 	if iterErr != nil {
 		return iterErr
 	}
-	return batch.flush()
+	return batch.Flush()
 }
 
 func (f *receiveEncryptedFolder) revertHandleDirs(dirs []string, snap *db.Snapshot) {

lib/model/folder_recvonly.go

@@ -82,8 +82,10 @@ func (f *receiveOnlyFolder) revert() error {
 		scanChan: scanChan,
 	}
 
-	batch := make([]protocol.FileInfo, 0, maxBatchSizeFiles)
-	batchSizeBytes := 0
+	batch := db.NewFileInfoBatch(func(files []protocol.FileInfo) error {
+		f.updateLocalsFromScanning(files)
+		return nil
+	})
 	snap, err := f.dbSnapshot()
 	if err != nil {
 		return err
@@ -124,21 +126,12 @@ func (f *receiveOnlyFolder) revert() error {
 			fi.Version = protocol.Vector{}
 		}
 
-		batch = append(batch, fi)
-		batchSizeBytes += fi.ProtoSize()
+		batch.Append(fi)
+		_ = batch.FlushIfFull()
 
-		if len(batch) >= maxBatchSizeFiles || batchSizeBytes >= maxBatchSizeBytes {
-			f.updateLocalsFromScanning(batch)
-			batch = batch[:0]
-			batchSizeBytes = 0
-		}
 		return true
 	})
-	if len(batch) > 0 {
-		f.updateLocalsFromScanning(batch)
-	}
-	batch = batch[:0]
-	batchSizeBytes = 0
+	_ = batch.Flush()
 
 	// Handle any queued directories
 	deleted, err := delQueue.flush(snap)
@@ -147,7 +140,7 @@ func (f *receiveOnlyFolder) revert() error {
 	}
 	now := time.Now()
 	for _, dir := range deleted {
-		batch = append(batch, protocol.FileInfo{
+		batch.Append(protocol.FileInfo{
 			Name:       dir,
 			Type:       protocol.FileInfoTypeDirectory,
 			ModifiedS:  now.Unix(),
@@ -156,9 +149,7 @@ func (f *receiveOnlyFolder) revert() error {
 			Version:    protocol.Vector{},
 		})
 	}
-	if len(batch) > 0 {
-		f.updateLocalsFromScanning(batch)
-	}
+	_ = batch.Flush()
 
 	// We will likely have changed our local index, but that won't trigger a
 	// pull by itself. Make sure we schedule one so that we start

lib/model/folder_sendonly.go

@@ -37,7 +37,7 @@ func (f *sendOnlyFolder) PullErrors() []FileError {
 
 // pull checks need for files that only differ by metadata (no changes on disk)
 func (f *sendOnlyFolder) pull() (bool, error) {
-	batch := newFileInfoBatch(func(files []protocol.FileInfo) error {
+	batch := db.NewFileInfoBatch(func(files []protocol.FileInfo) error {
 		f.updateLocalsFromPulling(files)
 		return nil
 	})
@@ -48,13 +48,13 @@ func (f *sendOnlyFolder) pull() (bool, error) {
 	}
 	defer snap.Release()
 	snap.WithNeed(protocol.LocalDeviceID, func(intf protocol.FileIntf) bool {
-		batch.flushIfFull()
+		batch.FlushIfFull()
 
 		file := intf.(protocol.FileInfo)
 
 		if f.ignores.ShouldIgnore(intf.FileName()) {
 			file.SetIgnored()
-			batch.append(file)
+			batch.Append(file)
 			l.Debugln(f, "Handling ignored file", file)
 			return true
 		}
@@ -63,7 +63,7 @@ func (f *sendOnlyFolder) pull() (bool, error) {
 		if !ok {
 			if intf.IsInvalid() {
 				// Global invalid file just exists for need accounting
-				batch.append(file)
+				batch.Append(file)
 			} else if intf.IsDeleted() {
 				l.Debugln("Should never get a deleted file as needed when we don't have it")
 				f.evLogger.Log(events.Failure, "got deleted file that doesn't exist locally as needed when pulling on send-only")
@@ -75,13 +75,13 @@ func (f *sendOnlyFolder) pull() (bool, error) {
 			return true
 		}
 
-		batch.append(file)
+		batch.Append(file)
 		l.Debugln(f, "Merging versions of identical file", file)
 
 		return true
 	})
 
-	batch.flush()
+	batch.Flush()
 
 	return true, nil
 }
@@ -96,8 +96,10 @@ func (f *sendOnlyFolder) override() error {
 	f.setState(FolderScanning)
 	defer f.setState(FolderIdle)
 
-	batch := make([]protocol.FileInfo, 0, maxBatchSizeFiles)
-	batchSizeBytes := 0
+	batch := db.NewFileInfoBatch(func(files []protocol.FileInfo) error {
+		f.updateLocalsFromScanning(files)
+		return nil
+	})
 	snap, err := f.dbSnapshot()
 	if err != nil {
 		return err
@@ -105,11 +107,7 @@ func (f *sendOnlyFolder) override() error {
 	defer snap.Release()
 	snap.WithNeed(protocol.LocalDeviceID, func(fi protocol.FileIntf) bool {
 		need := fi.(protocol.FileInfo)
-		if len(batch) == maxBatchSizeFiles || batchSizeBytes > maxBatchSizeBytes {
-			f.updateLocalsFromScanning(batch)
-			batch = batch[:0]
-			batchSizeBytes = 0
-		}
+		_ = batch.FlushIfFull()
 
 		have, ok := snap.Get(protocol.LocalDeviceID, need.Name)
 		// Don't override files that are in a bad state (ignored,
@@ -126,12 +124,8 @@ func (f *sendOnlyFolder) override() error {
 			need = have
 		}
 		need.Sequence = 0
-		batch = append(batch, need)
-		batchSizeBytes += need.ProtoSize()
+		batch.Append(need)
 		return true
 	})
-	if len(batch) > 0 {
-		f.updateLocalsFromScanning(batch)
-	}
-	return nil
+	return batch.Flush()
 }

lib/model/folder_sendrecv.go

@@ -357,11 +357,6 @@ func (f *sendReceiveFolder) processNeeded(snap *db.Snapshot, dbUpdateChan chan<-
 				changed--
 			}
 
-		case file.IsInvalid():
-			// Global invalid file just exists for need accounting
-			l.Debugln(f, "Handling global invalid item", file)
-			dbUpdateChan <- dbUpdateJob{file, dbUpdateInvalidate}
-
 		case file.IsDeleted():
 			if file.IsDirectory() {
 				// Perform directory deletions at the end, as we may have
@@ -1668,15 +1663,12 @@ func (f *sendReceiveFolder) Jobs(page, perpage int) ([]string, []string, int) {
 func (f *sendReceiveFolder) dbUpdaterRoutine(dbUpdateChan <-chan dbUpdateJob) {
 	const maxBatchTime = 2 * time.Second
 
-	batch := newFileInfoBatch(nil)
-	tick := time.NewTicker(maxBatchTime)
-	defer tick.Stop()
-
 	changedDirs := make(map[string]struct{})
 	found := false
 	var lastFile protocol.FileInfo
-
-	batch.flushFn = func(files []protocol.FileInfo) error {
+	tick := time.NewTicker(maxBatchTime)
+	defer tick.Stop()
+	batch := db.NewFileInfoBatch(func(files []protocol.FileInfo) error {
 		// sync directories
 		for dir := range changedDirs {
 			delete(changedDirs, dir)
@@ -1703,7 +1695,7 @@ func (f *sendReceiveFolder) dbUpdaterRoutine(dbUpdateChan <-chan dbUpdateJob) {
 		}
 
 		return nil
-	}
+	})
 
 	recvEnc := f.Type == config.FolderTypeReceiveEncrypted
 loop:
@@ -1736,16 +1728,16 @@ loop:
 
 			job.file.Sequence = 0
 
-			batch.append(job.file)
+			batch.Append(job.file)
 
-			batch.flushIfFull()
+			batch.FlushIfFull()
 
 		case <-tick.C:
-			batch.flush()
+			batch.Flush()
 		}
 	}
 
-	batch.flush()
+	batch.Flush()
 }
 
 // pullScannerRoutine aggregates paths to be scanned after pulling. The scan is

lib/model/folder_summary.go

@@ -4,6 +4,7 @@
 // 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/.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
 //go:generate counterfeiter -o mocks/folderSummaryService.go --fake-name FolderSummaryService . FolderSummaryService
 
 package model

lib/model/indexsender.go

@@ -118,15 +118,15 @@ func (s *indexSender) pause() {
 // returns the highest sent sequence number.
 func (s *indexSender) sendIndexTo(ctx context.Context) error {
 	initial := s.prevSequence == 0
-	batch := newFileInfoBatch(nil)
-	batch.flushFn = func(fs []protocol.FileInfo) error {
-		l.Debugf("%v: Sending %d files (<%d bytes)", s, len(batch.infos), batch.size)
+	batch := db.NewFileInfoBatch(nil)
+	batch.SetFlushFunc(func(fs []protocol.FileInfo) error {
+		l.Debugf("%v: Sending %d files (<%d bytes)", s, len(fs), batch.Size())
 		if initial {
 			initial = false
 			return s.conn.Index(ctx, s.folder, fs)
 		}
 		return s.conn.IndexUpdate(ctx, s.folder, fs)
-	}
+	})
 
 	var err error
 	var f protocol.FileInfo
@@ -140,8 +140,8 @@ func (s *indexSender) sendIndexTo(ctx context.Context) error {
 		// This is to make sure that renames (which is an add followed by a delete) land in the same batch.
 		// Even if the batch is full, we allow a last delete to slip in, we do this by making sure that
 		// the batch ends with a non-delete, or that the last item in the batch is already a delete
-		if batch.full() && (!fi.IsDeleted() || previousWasDelete) {
-			if err = batch.flush(); err != nil {
+		if batch.Full() && (!fi.IsDeleted() || previousWasDelete) {
+			if err = batch.Flush(); err != nil {
 				return false
 			}
 		}
@@ -181,14 +181,14 @@ func (s *indexSender) sendIndexTo(ctx context.Context) error {
 
 		previousWasDelete = f.IsDeleted()
 
-		batch.append(f)
+		batch.Append(f)
 		return true
 	})
 	if err != nil {
 		return err
 	}
 
-	err = batch.flush()
+	err = batch.Flush()
 
 	// True if there was nothing to be sent
 	if f.Sequence == 0 {

lib/model/mocks/model.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/syncthing/syncthing/lib/db"
+	"github.com/syncthing/syncthing/lib/fs"
 	"github.com/syncthing/syncthing/lib/model"
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/stats"
@@ -249,6 +250,20 @@ type Model struct {
 	getHelloReturnsOnCall map[int]struct {
 		result1 protocol.HelloIntf
 	}
+	GetMtimeMappingStub        func(string, string) (fs.MtimeMapping, error)
+	getMtimeMappingMutex       sync.RWMutex
+	getMtimeMappingArgsForCall []struct {
+		arg1 string
+		arg2 string
+	}
+	getMtimeMappingReturns struct {
+		result1 fs.MtimeMapping
+		result2 error
+	}
+	getMtimeMappingReturnsOnCall map[int]struct {
+		result1 fs.MtimeMapping
+		result2 error
+	}
 	GlobalDirectoryTreeStub        func(string, string, int, bool) ([]*model.TreeEntry, error)
 	globalDirectoryTreeMutex       sync.RWMutex
 	globalDirectoryTreeArgsForCall []struct {
@@ -1691,6 +1706,71 @@ func (fake *Model) GetHelloReturnsOnCall(i int, result1 protocol.HelloIntf) {
 	}{result1}
 }
 
+func (fake *Model) GetMtimeMapping(arg1 string, arg2 string) (fs.MtimeMapping, error) {
+	fake.getMtimeMappingMutex.Lock()
+	ret, specificReturn := fake.getMtimeMappingReturnsOnCall[len(fake.getMtimeMappingArgsForCall)]
+	fake.getMtimeMappingArgsForCall = append(fake.getMtimeMappingArgsForCall, struct {
+		arg1 string
+		arg2 string
+	}{arg1, arg2})
+	stub := fake.GetMtimeMappingStub
+	fakeReturns := fake.getMtimeMappingReturns
+	fake.recordInvocation("GetMtimeMapping", []interface{}{arg1, arg2})
+	fake.getMtimeMappingMutex.Unlock()
+	if stub != nil {
+		return stub(arg1, arg2)
+	}
+	if specificReturn {
+		return ret.result1, ret.result2
+	}
+	return fakeReturns.result1, fakeReturns.result2
+}
+
+func (fake *Model) GetMtimeMappingCallCount() int {
+	fake.getMtimeMappingMutex.RLock()
+	defer fake.getMtimeMappingMutex.RUnlock()
+	return len(fake.getMtimeMappingArgsForCall)
+}
+
+func (fake *Model) GetMtimeMappingCalls(stub func(string, string) (fs.MtimeMapping, error)) {
+	fake.getMtimeMappingMutex.Lock()
+	defer fake.getMtimeMappingMutex.Unlock()
+	fake.GetMtimeMappingStub = stub
+}
+
+func (fake *Model) GetMtimeMappingArgsForCall(i int) (string, string) {
+	fake.getMtimeMappingMutex.RLock()
+	defer fake.getMtimeMappingMutex.RUnlock()
+	argsForCall := fake.getMtimeMappingArgsForCall[i]
+	return argsForCall.arg1, argsForCall.arg2
+}
+
+func (fake *Model) GetMtimeMappingReturns(result1 fs.MtimeMapping, result2 error) {
+	fake.getMtimeMappingMutex.Lock()
+	defer fake.getMtimeMappingMutex.Unlock()
+	fake.GetMtimeMappingStub = nil
+	fake.getMtimeMappingReturns = struct {
+		result1 fs.MtimeMapping
+		result2 error
+	}{result1, result2}
+}
+
+func (fake *Model) GetMtimeMappingReturnsOnCall(i int, result1 fs.MtimeMapping, result2 error) {
+	fake.getMtimeMappingMutex.Lock()
+	defer fake.getMtimeMappingMutex.Unlock()
+	fake.GetMtimeMappingStub = nil
+	if fake.getMtimeMappingReturnsOnCall == nil {
+		fake.getMtimeMappingReturnsOnCall = make(map[int]struct {
+			result1 fs.MtimeMapping
+			result2 error
+		})
+	}
+	fake.getMtimeMappingReturnsOnCall[i] = struct {
+		result1 fs.MtimeMapping
+		result2 error
+	}{result1, result2}
+}
+
 func (fake *Model) GlobalDirectoryTree(arg1 string, arg2 string, arg3 int, arg4 bool) ([]*model.TreeEntry, error) {
 	fake.globalDirectoryTreeMutex.Lock()
 	ret, specificReturn := fake.globalDirectoryTreeReturnsOnCall[len(fake.globalDirectoryTreeArgsForCall)]
@@ -3186,6 +3266,8 @@ func (fake *Model) Invocations() map[string][][]interface{} {
 	defer fake.getFolderVersionsMutex.RUnlock()
 	fake.getHelloMutex.RLock()
 	defer fake.getHelloMutex.RUnlock()
+	fake.getMtimeMappingMutex.RLock()
+	defer fake.getMtimeMappingMutex.RUnlock()
 	fake.globalDirectoryTreeMutex.RLock()
 	defer fake.globalDirectoryTreeMutex.RUnlock()
 	fake.indexMutex.RLock()

lib/model/model.go

@@ -4,6 +4,7 @@
 // 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/.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
 //go:generate counterfeiter -o mocks/model.go --fake-name Model . Model
 
 package model
@@ -15,6 +16,7 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"os"
 	"path/filepath"
 	"reflect"
 	"runtime"
@@ -41,12 +43,6 @@ import (
 	"github.com/syncthing/syncthing/lib/versioner"
 )
 
-// How many files to send in each Index/IndexUpdate message.
-const (
-	maxBatchSizeBytes = 250 * 1024 // Aim for making index messages no larger than 250 KiB (uncompressed)
-	maxBatchSizeFiles = 1000       // Either way, don't include more files than this
-)
-
 type service interface {
 	suture.Service
 	BringToFront(string)
@@ -100,6 +96,7 @@ type Model interface {
 
 	CurrentFolderFile(folder string, file string) (protocol.FileInfo, bool, error)
 	CurrentGlobalFile(folder string, file string) (protocol.FileInfo, bool, error)
+	GetMtimeMapping(folder string, file string) (fs.MtimeMapping, error)
 	Availability(folder string, file protocol.FileInfo, block protocol.BlockInfo) ([]Availability, error)
 
 	Completion(device protocol.DeviceID, folder string) (FolderCompletion, error)
@@ -184,18 +181,21 @@ var (
 	errNetworkNotAllowed = errors.New("network not allowed")
 	errNoVersioner       = errors.New("folder has no versioner")
 	// errors about why a connection is closed
-	errReplacingConnection             = errors.New("replacing connection")
-	errStopped                         = errors.New("Syncthing is being stopped")
-	errEncryptionInvConfigLocal        = errors.New("can't encrypt data for a device when the folder type is receiveEncrypted")
-	errEncryptionInvConfigRemote       = errors.New("remote has encrypted data and encrypts that data for us - this is impossible")
-	errEncryptionNotEncryptedLocal     = errors.New("folder is announced as encrypted, but not configured thus")
-	errEncryptionNotEncryptedRemote    = errors.New("folder is configured to be encrypted but not announced thus")
-	errEncryptionNotEncryptedUntrusted = errors.New("device is untrusted, but configured to receive not encrypted data")
-	errEncryptionPassword              = errors.New("different encryption passwords used")
-	errEncryptionNeedToken             = errors.New("require password token for receive-encrypted token")
-	errMissingRemoteInClusterConfig    = errors.New("remote device missing in cluster config")
-	errMissingLocalInClusterConfig     = errors.New("local device missing in cluster config")
-	errConnLimitReached                = errors.New("connection limit reached")
+	errReplacingConnection                = errors.New("replacing connection")
+	errStopped                            = errors.New("Syncthing is being stopped")
+	errEncryptionInvConfigLocal           = errors.New("can't encrypt outgoing data because local data is encrypted (folder-type receive-encrypted)")
+	errEncryptionInvConfigRemote          = errors.New("remote has encrypted data and encrypts that data for us - this is impossible")
+	errEncryptionNotEncryptedLocal        = errors.New("remote expects to exchange encrypted data, but is configured for plain data")
+	errEncryptionPlainForReceiveEncrypted = errors.New("remote expects to exchange plain data, but is configured to be encrypted")
+	errEncryptionPlainForRemoteEncrypted  = errors.New("remote expects to exchange plain data, but local data is encrypted (folder-type receive-encrypted)")
+	errEncryptionNotEncryptedUntrusted    = errors.New("device is untrusted, but configured to receive plain data")
+	errEncryptionPassword                 = errors.New("different encryption passwords used")
+	errEncryptionTokenRead                = errors.New("failed to read encryption token")
+	errEncryptionTokenWrite               = errors.New("failed to write encryption token")
+	errEncryptionNeedToken                = errors.New("require password token for receive-encrypted token")
+	errMissingRemoteInClusterConfig       = errors.New("remote device missing in cluster config")
+	errMissingLocalInClusterConfig        = errors.New("local device missing in cluster config")
+	errConnLimitReached                   = errors.New("connection limit reached")
 	// messages for failure reports
 	failureUnexpectedGenerateCCError = "unexpected error occurred in generateClusterConfig"
 )
@@ -1381,9 +1381,12 @@ func (m *model) ccHandleFolders(folders []protocol.Folder, deviceCfg config.Devi
 			if sameError {
 				l.Debugln(msg)
 			} else {
+				if rerr, ok := err.(*redactedError); ok {
+					err = rerr.redacted
+				}
+				m.evLogger.Log(events.Failure, err.Error())
 				l.Warnln(msg)
 			}
-			m.evLogger.Log(events.Failure, err.Error())
 			return tempIndexFolders, paused, err
 		}
 		if devErrs, ok := m.folderEncryptionFailures[folder.ID]; ok {
@@ -1468,7 +1471,11 @@ func (m *model) ccCheckEncryption(fcfg config.FolderConfiguration, folderDevice
 	}
 
 	if !(hasTokenRemote || hasTokenLocal) {
-		return errEncryptionNotEncryptedRemote
+		if isEncryptedRemote {
+			return errEncryptionPlainForReceiveEncrypted
+		} else {
+			return errEncryptionPlainForRemoteEncrypted
+		}
 	}
 
 	if !(isEncryptedRemote || isEncryptedLocal) {
@@ -1506,7 +1513,13 @@ func (m *model) ccCheckEncryption(fcfg config.FolderConfiguration, folderDevice
 		var err error
 		token, err = readEncryptionToken(fcfg)
 		if err != nil && !fs.IsNotExist(err) {
-			return err
+			if rerr, ok := redactPathError(err); ok {
+				return rerr
+			}
+			return &redactedError{
+				error:    err,
+				redacted: errEncryptionTokenRead,
+			}
 		}
 		if err == nil {
 			m.fmut.Lock()
@@ -1514,7 +1527,14 @@ func (m *model) ccCheckEncryption(fcfg config.FolderConfiguration, folderDevice
 			m.fmut.Unlock()
 		} else {
 			if err := writeEncryptionToken(ccToken, fcfg); err != nil {
-				return err
+				if rerr, ok := redactPathError(err); ok {
+					return rerr
+				} else {
+					return &redactedError{
+						error:    err,
+						redacted: errEncryptionTokenWrite,
+					}
+				}
 			}
 			m.fmut.Lock()
 			m.folderEncryptionPasswordTokens[fcfg.ID] = ccToken
@@ -2025,12 +2045,12 @@ func (m *model) CurrentFolderFile(folder string, file string) (protocol.FileInfo
 
 func (m *model) CurrentGlobalFile(folder string, file string) (protocol.FileInfo, bool, error) {
 	m.fmut.RLock()
-	fs, ok := m.folderFiles[folder]
+	ffs, ok := m.folderFiles[folder]
 	m.fmut.RUnlock()
 	if !ok {
 		return protocol.FileInfo{}, false, ErrFolderMissing
 	}
-	snap, err := fs.Snapshot()
+	snap, err := ffs.Snapshot()
 	if err != nil {
 		return protocol.FileInfo{}, false, err
 	}
@@ -2039,6 +2059,16 @@ func (m *model) CurrentGlobalFile(folder string, file string) (protocol.FileInfo
 	return f, ok, nil
 }
 
+func (m *model) GetMtimeMapping(folder string, file string) (fs.MtimeMapping, error) {
+	m.fmut.RLock()
+	ffs, ok := m.folderFiles[folder]
+	m.fmut.RUnlock()
+	if !ok {
+		return fs.MtimeMapping{}, ErrFolderMissing
+	}
+	return fs.GetMtimeMapping(ffs.MtimeFS(), file)
+}
+
 // Connection returns the current connection for device, and a boolean whether a connection was found.
 func (m *model) Connection(deviceID protocol.DeviceID) (protocol.Connection, bool) {
 	m.pmut.RLock()
@@ -3135,51 +3165,6 @@ func (s folderDeviceSet) hasDevice(dev protocol.DeviceID) bool {
 	return false
 }
 
-type fileInfoBatch struct {
-	infos   []protocol.FileInfo
-	size    int
-	flushFn func([]protocol.FileInfo) error
-}
-
-func newFileInfoBatch(fn func([]protocol.FileInfo) error) *fileInfoBatch {
-	return &fileInfoBatch{
-		infos:   make([]protocol.FileInfo, 0, maxBatchSizeFiles),
-		flushFn: fn,
-	}
-}
-
-func (b *fileInfoBatch) append(f protocol.FileInfo) {
-	b.infos = append(b.infos, f)
-	b.size += f.ProtoSize()
-}
-
-func (b *fileInfoBatch) full() bool {
-	return len(b.infos) >= maxBatchSizeFiles || b.size >= maxBatchSizeBytes
-}
-
-func (b *fileInfoBatch) flushIfFull() error {
-	if b.full() {
-		return b.flush()
-	}
-	return nil
-}
-
-func (b *fileInfoBatch) flush() error {
-	if len(b.infos) == 0 {
-		return nil
-	}
-	if err := b.flushFn(b.infos); err != nil {
-		return err
-	}
-	b.reset()
-	return nil
-}
-
-func (b *fileInfoBatch) reset() {
-	b.infos = b.infos[:0]
-	b.size = 0
-}
-
 // syncMutexMap is a type safe wrapper for a sync.Map that holds mutexes
 type syncMutexMap struct {
 	inner stdsync.Map
@@ -3258,3 +3243,21 @@ type updatedPendingFolder struct {
 	DeviceID         protocol.DeviceID `json:"deviceID"`
 	ReceiveEncrypted bool              `json:"receiveEncrypted"`
 }
+
+// redactPathError checks if the error is actually a os.PathError, and if yes
+// returns a redactedError with the path removed.
+func redactPathError(err error) (error, bool) {
+	perr, ok := err.(*os.PathError)
+	if !ok {
+		return nil, false
+	}
+	return &redactedError{
+		error:    err,
+		redacted: fmt.Errorf("%v: %w", perr.Op, perr.Err),
+	}, true
+}
+
+type redactedError struct {
+	error
+	redacted error
+}

lib/model/model_test.go

@@ -4068,14 +4068,14 @@ func TestCcCheckEncryption(t *testing.T) {
 			tokenLocal:        nil,
 			isEncryptedRemote: true,
 			isEncryptedLocal:  false,
-			expectedErr:       errEncryptionNotEncryptedRemote,
+			expectedErr:       errEncryptionPlainForRemoteEncrypted,
 		},
 		{
 			tokenRemote:       nil,
 			tokenLocal:        nil,
 			isEncryptedRemote: false,
 			isEncryptedLocal:  true,
-			expectedErr:       errEncryptionNotEncryptedRemote,
+			expectedErr:       errEncryptionPlainForReceiveEncrypted,
 		},
 		{
 			tokenRemote:       nil,

lib/model/requests_test.go

@@ -1400,21 +1400,24 @@ func TestRequestReceiveEncryptedLocalNoSend(t *testing.T) {
 	}
 }
 
-func TestRequestIssue7474(t *testing.T) {
-	// Repro for https://github.com/syncthing/syncthing/issues/7474
-	// Devices A, B and C. B connected to A and C, but not A to C.
-	// A has valid file, B ignores it.
-	// In the test C is local, and B is the fake connection.
-
+func TestRequestGlobalInvalidToValid(t *testing.T) {
 	done := make(chan struct{})
 	defer close(done)
 
 	m, fc, fcfg, wcfgCancel := setupModelWithConnection(t)
 	defer wcfgCancel()
+	fcfg.Devices = append(fcfg.Devices, config.FolderDeviceConfiguration{DeviceID: device2})
+	waiter, err := m.cfg.Modify(func(cfg *config.Configuration) {
+		cfg.SetDevice(newDeviceConfiguration(cfg.Defaults.Device, device2, "device2"))
+		fcfg.Devices = append(fcfg.Devices, config.FolderDeviceConfiguration{DeviceID: device2})
+		cfg.SetFolder(fcfg)
+	})
+	must(t, err)
+	waiter.Wait()
 	tfs := fcfg.Filesystem()
 	defer cleanupModelAndRemoveDir(m, tfs.URI())
 
-	indexChan := make(chan []protocol.FileInfo)
+	indexChan := make(chan []protocol.FileInfo, 1)
 	fc.setIndexFn(func(ctx context.Context, folder string, fs []protocol.FileInfo) error {
 		select {
 		case indexChan <- fs:
@@ -1426,18 +1429,67 @@ func TestRequestIssue7474(t *testing.T) {
 
 	name := "foo"
 
-	fc.addFileWithLocalFlags(name, protocol.FileInfoTypeFile, protocol.FlagLocalIgnored)
+	// Setup device with valid file, do not send index yet
+	contents := []byte("test file contents\n")
+	fc.addFile(name, 0644, protocol.FileInfoTypeFile, contents)
+
+	// Third device ignoring the same file
+	fc.mut.Lock()
+	file := fc.files[0]
+	fc.mut.Unlock()
+	file.SetIgnored()
+	m.IndexUpdate(device2, fcfg.ID, []protocol.FileInfo{prepareFileInfoForIndex(file)})
+
+	// Wait for the ignored file to be received and possible pulled
+	timeout := time.After(10 * time.Second)
+	globalUpdated := false
+	for {
+		select {
+		case <-timeout:
+			t.Fatalf("timed out (globalUpdated == %v)", globalUpdated)
+		default:
+			time.Sleep(10 * time.Millisecond)
+		}
+		if !globalUpdated {
+			_, ok, err := m.CurrentGlobalFile(fcfg.ID, name)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if !ok {
+				continue
+			}
+			globalUpdated = true
+		}
+		snap, err := m.DBSnapshot(fcfg.ID)
+		if err != nil {
+			t.Fatal(err)
+		}
+		need := snap.NeedSize(protocol.LocalDeviceID)
+		snap.Release()
+		if need.Files == 0 {
+			break
+		}
+	}
+
+	// Send the valid file
 	fc.sendIndexUpdate()
 
-	select {
-	case <-time.After(10 * time.Second):
-		t.Fatal("timed out before receiving index")
-	case fs := <-indexChan:
-		if len(fs) != 1 {
-			t.Fatalf("Expected one file in index, got %v", len(fs))
-		}
-		if !fs[0].IsInvalid() {
-			t.Error("Expected invalid file")
+	gotInvalid := false
+	for {
+		select {
+		case <-timeout:
+			t.Fatal("timed out before receiving index")
+		case fs := <-indexChan:
+			if len(fs) != 1 {
+				t.Fatalf("Expected one file in index, got %v", len(fs))
+			}
+			if !fs[0].IsInvalid() {
+				return
+			}
+			if gotInvalid {
+				t.Fatal("Received two invalid index updates")
+			}
+			gotInvalid = true
 		}
 	}
 }

lib/protocol/protocol.go

@@ -1,5 +1,7 @@
 // Copyright (C) 2014 The Protocol Authors.
 
+//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
+
 // Prevents import loop, for internal testing
 //go:generate counterfeiter -o mocked_connection_info_test.go --fake-name mockedConnectionInfo . ConnectionInfo
 //go:generate go run ../../script/prune_mocks.go -t mocked_connection_info_test.go

lib/relay/client/client.go

@@ -35,21 +35,21 @@ type RelayClient interface {
 	URI() *url.URL
 }
 
-func NewClient(uri *url.URL, certs []tls.Certificate, invitations chan protocol.SessionInvitation, timeout time.Duration) (RelayClient, error) {
+func NewClient(uri *url.URL, certs []tls.Certificate, timeout time.Duration) (RelayClient, error) {
 	factory, ok := supportedSchemes[uri.Scheme]
 	if !ok {
 		return nil, fmt.Errorf("unsupported scheme: %s", uri.Scheme)
 	}
 
+	invitations := make(chan protocol.SessionInvitation)
 	return factory(uri, certs, invitations, timeout), nil
 }
 
 type commonClient struct {
 	svcutil.ServiceWithError
 
-	invitations              chan protocol.SessionInvitation
-	closeInvitationsOnFinish bool
-	mut                      sync.RWMutex
+	invitations chan protocol.SessionInvitation
+	mut         sync.RWMutex
 }
 
 func newCommonClient(invitations chan protocol.SessionInvitation, serve func(context.Context) error, creator string) commonClient {
@@ -57,26 +57,10 @@ func newCommonClient(invitations chan protocol.SessionInvitation, serve func(con
 		invitations: invitations,
 		mut:         sync.NewRWMutex(),
 	}
-	newServe := func(ctx context.Context) error {
-		defer c.cleanup()
-		return serve(ctx)
-	}
-	c.ServiceWithError = svcutil.AsService(newServe, creator)
-	if c.invitations == nil {
-		c.closeInvitationsOnFinish = true
-		c.invitations = make(chan protocol.SessionInvitation)
-	}
+	c.ServiceWithError = svcutil.AsService(serve, creator)
 	return c
 }
 
-func (c *commonClient) cleanup() {
-	c.mut.Lock()
-	if c.closeInvitationsOnFinish {
-		close(c.invitations)
-	}
-	c.mut.Unlock()
-}
-
 func (c *commonClient) Invitations() chan protocol.SessionInvitation {
 	c.mut.RLock()
 	defer c.mut.RUnlock()

lib/relay/client/dynamic.go

@@ -93,7 +93,8 @@ func (c *dynamicClient) serve(ctx context.Context) error {
 			c.client = client
 			c.mut.Unlock()
 
-			c.client.Serve(ctx)
+			err = c.client.Serve(ctx)
+			l.Debugf("Disconnected from %s://%s: %v", c.client.URI().Scheme, c.client.URI().Host, err)
 
 			c.mut.Lock()
 			c.client = nil

lib/relay/client/methods.go

@@ -114,16 +114,20 @@ func JoinSession(ctx context.Context, invitation protocol.SessionInvitation) (ne
 
 func TestRelay(ctx context.Context, uri *url.URL, certs []tls.Certificate, sleep, timeout time.Duration, times int) error {
 	id := syncthingprotocol.NewDeviceID(certs[0].Certificate[0])
-	invs := make(chan protocol.SessionInvitation, 1)
-	c, err := NewClient(uri, certs, invs, timeout)
+	c, err := NewClient(uri, certs, timeout)
 	if err != nil {
-		close(invs)
 		return fmt.Errorf("creating client: %w", err)
 	}
 	ctx, cancel := context.WithCancel(context.Background())
+	go c.Serve(ctx)
 	go func() {
-		c.Serve(ctx)
-		close(invs)
+		for {
+			select {
+			case <-c.Invitations():
+			case <-ctx.Done():
+				return
+			}
+		}
 	}()
 	defer cancel()
 

lib/relay/client/static.go

@@ -48,7 +48,7 @@ func newStaticClient(uri *url.URL, certs []tls.Certificate, invitations chan pro
 
 func (c *staticClient) serve(ctx context.Context) error {
 	if err := c.connect(ctx); err != nil {
-		l.Infof("Could not connect to relay %s: %s", c.uri, err)
+		l.Debugf("Could not connect to relay %s: %s", c.uri, err)
 		return err
 	}
 
@@ -56,17 +56,16 @@ func (c *staticClient) serve(ctx context.Context) error {
 	defer c.disconnect()
 
 	if err := c.join(); err != nil {
-		l.Infof("Could not join relay %s: %s", c.uri, err)
+		l.Debugf("Could not join relay %s: %s", c.uri, err)
 		return err
 	}
 
 	if err := c.conn.SetDeadline(time.Time{}); err != nil {
-		l.Infoln("Relay set deadline:", err)
+		l.Debugln("Relay set deadline:", err)
 		return err
 	}
 
 	l.Infof("Joined relay %s://%s", c.uri.Scheme, c.uri.Host)
-	defer l.Infof("Disconnected from relay %s://%s", c.uri.Scheme, c.uri.Host)
 
 	c.mut.Lock()
 	c.connected = true
@@ -88,7 +87,7 @@ func (c *staticClient) serve(ctx context.Context) error {
 			switch msg := message.(type) {
 			case protocol.Ping:
 				if err := protocol.WriteMessage(c.conn, protocol.Pong{}); err != nil {
-					l.Infoln("Relay write:", err)
+					l.Debugln("Relay write:", err)
 					return err
 				}
 				l.Debugln(c, "sent pong")
@@ -98,23 +97,28 @@ func (c *staticClient) serve(ctx context.Context) error {
 				if len(ip) == 0 || ip.IsUnspecified() {
 					msg.Address = remoteIPBytes(c.conn)
 				}
-				c.invitations <- msg
+				select {
+				case c.invitations <- msg:
+				case <-ctx.Done():
+					l.Debugln(c, "stopping")
+					return ctx.Err()
+				}
 
 			case protocol.RelayFull:
-				l.Infof("Disconnected from relay %s due to it becoming full.", c.uri)
+				l.Debugf("Disconnected from relay %s due to it becoming full.", c.uri)
 				return errors.New("relay full")
 
 			default:
-				l.Infoln("Relay: protocol error: unexpected message %v", msg)
+				l.Debugln("Relay: protocol error: unexpected message %v", msg)
 				return fmt.Errorf("protocol error: unexpected message %v", msg)
 			}
 
 		case <-ctx.Done():
 			l.Debugln(c, "stopping")
-			return nil
+			return ctx.Err()
 
 		case err := <-errorsc:
-			l.Infof("Disconnecting from relay %s due to error: %s", c.uri, err)
+			l.Debugf("Disconnecting from relay %s due to error: %s", c.uri, err)
 			return err
 
 		case <-timeout.C:

lib/relay/protocol/packets.go

@@ -1,6 +1,6 @@
 // Copyright (C) 2015 Audrius Butkevicius and Contributors (see the CONTRIBUTORS file).
 
-//go:generate -command genxdr go run ../../../repos/xdr/cmd/genxdr/main.go
+//go:generate -command genxdr go run github.com/calmh/xdr/cmd/genxdr
 //go:generate genxdr -o packets_xdr.go packets.go
 
 package protocol

lib/stun/stun.go

@@ -38,17 +38,35 @@ const (
 	NATSymmetricUDPFirewall = stun.NATSymmetricUDPFirewall
 )
 
-type writeTrackingPacketConn struct {
+type writeTrackingUdpConn struct {
 	lastWrite int64 // atomic, must remain 64-bit aligned
-	net.PacketConn
+	// Needs to be UDPConn not PacketConn, as pfilter checks for WriteMsgUDP/ReadMsgUDP
+	// and even if we embed UDPConn here, in place of a PacketConn, seems the interface
+	// check fails.
+	*net.UDPConn
 }
 
-func (c *writeTrackingPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+func (c *writeTrackingUdpConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
 	atomic.StoreInt64(&c.lastWrite, time.Now().Unix())
-	return c.PacketConn.WriteTo(p, addr)
+	return c.UDPConn.WriteTo(p, addr)
 }
 
-func (c *writeTrackingPacketConn) getLastWrite() time.Time {
+func (c *writeTrackingUdpConn) WriteMsgUDP(b, oob []byte, addr *net.UDPAddr) (n, oobn int, err error) {
+	atomic.StoreInt64(&c.lastWrite, time.Now().Unix())
+	return c.UDPConn.WriteMsgUDP(b, oob, addr)
+}
+
+func (c *writeTrackingUdpConn) WriteToUDP(b []byte, addr *net.UDPAddr) (int, error) {
+	atomic.StoreInt64(&c.lastWrite, time.Now().Unix())
+	return c.UDPConn.WriteToUDP(b, addr)
+}
+
+func (c *writeTrackingUdpConn) Write(b []byte) (int, error) {
+	atomic.StoreInt64(&c.lastWrite, time.Now().Unix())
+	return c.UDPConn.Write(b)
+}
+
+func (c *writeTrackingUdpConn) getLastWrite() time.Time {
 	unix := atomic.LoadInt64(&c.lastWrite)
 	return time.Unix(unix, 0)
 }
@@ -65,18 +83,18 @@ type Service struct {
 	stunConn   net.PacketConn
 	client     *stun.Client
 
-	writeTrackingPacketConn *writeTrackingPacketConn
+	writeTrackingUdpConn *writeTrackingUdpConn
 
 	natType NATType
 	addr    *Host
 }
 
-func New(cfg config.Wrapper, subscriber Subscriber, conn net.PacketConn) (*Service, net.PacketConn) {
+func New(cfg config.Wrapper, subscriber Subscriber, conn *net.UDPConn) (*Service, net.PacketConn) {
 	// Wrap the original connection to track writes on it
-	writeTrackingPacketConn := &writeTrackingPacketConn{lastWrite: 0, PacketConn: conn}
+	writeTrackingUdpConn := &writeTrackingUdpConn{lastWrite: 0, UDPConn: conn}
 
 	// Wrap it in a filter and split it up, so that stun packets arrive on stun conn, others arrive on the data conn
-	filterConn := pfilter.NewPacketFilter(writeTrackingPacketConn)
+	filterConn := pfilter.NewPacketFilter(writeTrackingUdpConn)
 	otherDataConn := filterConn.NewConn(otherDataPriority, nil)
 	stunConn := filterConn.NewConn(stunFilterPriority, &stunFilter{
 		ids: make(map[string]time.Time),
@@ -97,7 +115,7 @@ func New(cfg config.Wrapper, subscriber Subscriber, conn net.PacketConn) (*Servi
 		stunConn:   stunConn,
 		client:     client,
 
-		writeTrackingPacketConn: writeTrackingPacketConn,
+		writeTrackingUdpConn: writeTrackingUdpConn,
 
 		natType: NATUnknown,
 		addr:    nil,
@@ -241,7 +259,7 @@ func (s *Service) stunKeepAlive(ctx context.Context, addr string, extAddr *Host)
 		}
 
 		// Adjust the keepalives to fire only nextSleep after last write.
-		lastWrite := s.writeTrackingPacketConn.getLastWrite()
+		lastWrite := s.writeTrackingUdpConn.getLastWrite()
 		minSleep := time.Duration(s.cfg.Options().StunKeepaliveMinS) * time.Second
 		if nextSleep < minSleep {
 			nextSleep = minSleep
@@ -270,7 +288,7 @@ func (s *Service) stunKeepAlive(ctx context.Context, addr string, extAddr *Host)
 		}
 
 		// Check if any writes happened while we were sleeping, if they did, sleep again
-		lastWrite = s.writeTrackingPacketConn.getLastWrite()
+		lastWrite = s.writeTrackingUdpConn.getLastWrite()
 		if gap := time.Since(lastWrite); gap < nextSleep {
 			l.Debugf("%s stun last write gap less than next sleep: %s < %s. Will try later", s, gap, nextSleep)
 			goto tryLater

lib/svcutil/svcutil.go

@@ -160,7 +160,7 @@ func SpecWithDebugLogger(l logger.Logger) suture.Spec {
 }
 
 func SpecWithInfoLogger(l logger.Logger) suture.Spec {
-	return spec(func(e suture.Event) { l.Infoln(e) })
+	return spec(infoEventHook(l))
 }
 
 func spec(eventHook suture.EventHook) suture.Spec {
@@ -171,3 +171,35 @@ func spec(eventHook suture.EventHook) suture.Spec {
 		DontPropagateTermination: false,
 	}
 }
+
+// infoEventHook prints service failures and failures to stop services at level
+// info. All other events and identical, consecutive failures are logged at
+// debug only.
+func infoEventHook(l logger.Logger) suture.EventHook {
+	var prevTerminate suture.EventServiceTerminate
+	return func(ei suture.Event) {
+		switch e := ei.(type) {
+		case suture.EventStopTimeout:
+			l.Infof("%s: Service %s failed to terminate in a timely manner", e.SupervisorName, e.ServiceName)
+		case suture.EventServicePanic:
+			l.Warnln("Caught a service panic, which shouldn't happen")
+			l.Infoln(e)
+		case suture.EventServiceTerminate:
+			msg := fmt.Sprintf("%s: service %s failed: %s", e.SupervisorName, e.ServiceName, e.Err)
+			if e.ServiceName == prevTerminate.ServiceName && e.Err == prevTerminate.Err {
+				l.Debugln(msg)
+			} else {
+				l.Infoln(msg)
+			}
+			prevTerminate = e
+			l.Debugln(e) // Contains some backoff statistics
+		case suture.EventBackoff:
+			l.Debugf("%s: exiting the backoff state.", e.SupervisorName)
+		case suture.EventResume:
+			l.Debugf("%s: too many service failures - entering the backoff state.", e.SupervisorName)
+		default:
+			l.Warnln("Unknown suture supervisor event type", e.Type())
+			l.Infoln(e)
+		}
+	}
+}

lib/syncthing/syncthing.go

@@ -110,7 +110,8 @@ func (a *App) Start() error {
 	a.stopped = make(chan struct{})
 	ctx, cancel := context.WithCancel(context.Background())
 	a.mainServiceCancel = cancel
-	go a.run(ctx)
+	errChan := a.mainService.ServeBackground(ctx)
+	go a.wait(errChan)
 
 	if err := a.startup(); err != nil {
 		a.stopWithErr(svcutil.ExitError, err)
@@ -255,7 +256,13 @@ func (a *App) startup() error {
 	// The TLS configuration is used for both the listening socket and outgoing
 	// connections.
 
-	tlsCfg := tlsutil.SecureDefault()
+	var tlsCfg *tls.Config
+	if a.cfg.Options().InsecureAllowOldTLSVersions {
+		l.Infoln("TLS 1.2 is allowed on sync connections. This is less than optimally secure.")
+		tlsCfg = tlsutil.SecureDefaultWithTLS12()
+	} else {
+		tlsCfg = tlsutil.SecureDefaultTLS13()
+	}
 	tlsCfg.Certificates = []tls.Certificate{a.cert}
 	tlsCfg.NextProtos = []string{bepProtocolName}
 	tlsCfg.ClientAuth = tls.RequestClientCert
@@ -328,8 +335,8 @@ func (a *App) startup() error {
 	return nil
 }
 
-func (a *App) run(ctx context.Context) {
-	err := a.mainService.Serve(ctx)
+func (a *App) wait(errChan <-chan error) {
+	err := <-errChan
 	a.handleMainServiceError(err)
 
 	done := make(chan struct{})

lib/tlsutil/tlsutil.go

@@ -29,30 +29,22 @@ var (
 )
 
 var (
-	// The list of cipher suites we will use / suggest for TLS connections.
-	// This is built based on the component slices below, depending on what
-	// the hardware prefers.
-	cipherSuites []uint16
+	// The list of cipher suites we will use / suggest for TLS 1.2 connections.
+	cipherSuites = []uint16{
+		// Suites that are good and fast on hardware *without* AES-NI.
+		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
 
-	// Suites that are good and fast on hardware with AES-NI. These are
-	// reordered from the Go default to put the 256 bit ciphers above the
-	// 128 bit ones - because that looks cooler, even though there is
-	// probably no relevant difference in strength yet.
-	gcmSuites = []uint16{
+		// Suites that are good and fast on hardware with AES-NI. These are
+		// reordered from the Go default to put the 256 bit ciphers above the
+		// 128 bit ones - because that looks cooler, even though there is
+		// probably no relevant difference in strength yet.
 		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,
-	}
 
-	// Suites that are good and fast on hardware *without* AES-NI.
-	chaChaSuites = []uint16{
-		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
-		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
-	}
-
-	// The rest of the suites, minus DES stuff.
-	otherSuites = []uint16{
+		// The rest of the suites, minus DES stuff.
 		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
 		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
 		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
@@ -67,13 +59,18 @@ var (
 	}
 )
 
-func init() {
-	// Creates the list of ciper suites that SecureDefault uses.
-	cipherSuites = buildCipherSuites()
+// SecureDefault returns a tls.Config with reasonable, secure defaults set.
+// This variant allows only TLS 1.3.
+func SecureDefaultTLS13() *tls.Config {
+	return &tls.Config{
+		// TLS 1.3 is the minimum we accept
+		MinVersion: tls.VersionTLS13,
+	}
 }
 
-// SecureDefault returns a tls.Config with reasonable, secure defaults set.
-func SecureDefault() *tls.Config {
+// SecureDefaultWithTLS12 returns a tls.Config with reasonable, secure
+// defaults set. This variant allows TLS 1.2.
+func SecureDefaultWithTLS12() *tls.Config {
 	// paranoia
 	cs := make([]uint16, len(cipherSuites))
 	copy(cs, cipherSuites)
@@ -245,79 +242,3 @@ func pemBlockForKey(priv interface{}) (*pem.Block, error) {
 		return nil, errors.New("unknown key type")
 	}
 }
-
-// buildCipherSuites returns a list of cipher suites with either AES-GCM or
-// ChaCha20 at the top. This takes advantage of the CPU detection that the
-// TLS package does to create an optimal cipher suite list for the current
-// hardware.
-func buildCipherSuites() []uint16 {
-	pref := preferredCipherSuite()
-	for _, suite := range gcmSuites {
-		if suite == pref {
-			// Go preferred an AES-GCM suite. Use those first.
-			return append(gcmSuites, append(chaChaSuites, otherSuites...)...)
-		}
-	}
-	// Use ChaCha20 at the top, then AES-GCM etc.
-	return append(chaChaSuites, append(gcmSuites, otherSuites...)...)
-}
-
-// preferredCipherSuite returns the cipher suite that is selected for a TLS
-// connection made with the Go defaults to ourselves. This is (currently,
-// probably) either a ChaCha20 suite or an AES-GCM suite, depending on what
-// the CPU detection has decided is fastest on this hardware.
-//
-// The function will return zero if something odd happens, and there's no
-// guarantee what cipher suite would be chosen anyway, so the return value
-// should be taken with a grain of salt.
-func preferredCipherSuite() uint16 {
-	// This is one of our certs from NewCertificate above, to avoid having
-	// to generate one at init time just for this function.
-	crtBs := []byte(`-----BEGIN CERTIFICATE-----
-MIIBXDCCAQOgAwIBAgIIQUODl2/bE4owCgYIKoZIzj0EAwIwFDESMBAGA1UEAxMJ
-c3luY3RoaW5nMB4XDTE4MTAxNDA2MjU0M1oXDTQ5MTIzMTIzNTk1OVowFDESMBAG
-A1UEAxMJc3luY3RoaW5nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEMqP+1lL4
-0s/xtI3ygExzYc/GvLHr0qetpBrUVHaDwS/cR1yXDsYaJpJcUNtrf1XK49IlpWW1
-Ds8seQsSg7/9BaM/MD0wDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUF
-BwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMAoGCCqGSM49BAMCA0cAMEQCIFxY
-MDBA92FKqZYSZjmfdIbT1OI6S9CnAFvL/pJZJwNuAiAV7osre2NiCHtXABOvsGrH
-vKWqDvXcHr6Tlo+LmTAdyg==
------END CERTIFICATE-----
-	`)
-	keyBs := []byte(`-----BEGIN EC PRIVATE KEY-----
-MHcCAQEEIHtPxVHlj6Bhi9RgSR2/lAtIQ7APM9wmpaJAcds6TD2CoAoGCCqGSM49
-AwEHoUQDQgAEMqP+1lL40s/xtI3ygExzYc/GvLHr0qetpBrUVHaDwS/cR1yXDsYa
-JpJcUNtrf1XK49IlpWW1Ds8seQsSg7/9BQ==
------END EC PRIVATE KEY-----
-	`)
-
-	cert, err := tls.X509KeyPair(crtBs, keyBs)
-	if err != nil {
-		return 0
-	}
-
-	serverCfg := &tls.Config{
-		MinVersion:               tls.VersionTLS12,
-		PreferServerCipherSuites: true,
-		Certificates:             []tls.Certificate{cert},
-	}
-
-	clientCfg := &tls.Config{
-		MinVersion:         tls.VersionTLS12,
-		InsecureSkipVerify: true,
-	}
-
-	c0, c1 := net.Pipe()
-
-	c := tls.Client(c0, clientCfg)
-	go func() {
-		c.Handshake()
-	}()
-
-	s := tls.Server(c1, serverCfg)
-	if err := s.Handshake(); err != nil {
-		return 0
-	}
-
-	return c.ConnectionState().CipherSuite
-}

lib/tlsutil/tlsutil_test.go

@@ -98,7 +98,7 @@ func TestCheckCipherSuites(t *testing.T) {
 		tls.TLS_RSA_WITH_AES_256_CBC_SHA,
 	}
 
-	suites := buildCipherSuites()
+	suites := SecureDefaultWithTLS12().CipherSuites
 
 	if len(suites) != len(allSuites) {
 		t.Fatal("should get a list representing all suites")

lib/util/utils.go

@@ -280,3 +280,15 @@ func NiceDurationString(d time.Duration) string {
 	}
 	return d.String()
 }
+
+func EqualStrings(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}

man/stdiscosrv.1

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "STDISCOSRV" "1" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-stdiscosrv \- Syncthing Discovery Server
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "STDISCOSRV" "1" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+stdiscosrv \- Syncthing Discovery Server
 .SH SYNOPSIS
 .INDENT 0.0
 .INDENT 3.5

man/strelaysrv.1

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "STRELAYSRV" "1" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-strelaysrv \- Syncthing Relay Server
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "STRELAYSRV" "1" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+strelaysrv \- Syncthing Relay Server
 .SH SYNOPSIS
 .INDENT 0.0
 .INDENT 3.5

man/syncthing-bep.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-BEP" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-bep \- Block Exchange Protocol v1
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-BEP" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-bep \- Block Exchange Protocol v1
 .SH INTRODUCTION AND DEFINITIONS
 .sp
 The Block Exchange Protocol (BEP) is used between two or more \fIdevices\fP thus

man/syncthing-config.5

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-CONFIG" "5" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-config \- Syncthing Configuration
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-CONFIG" "5" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-config \- Syncthing Configuration
 .SH SYNOPSIS
 .INDENT 0.0
 .INDENT 3.5

man/syncthing-device-ids.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-DEVICE-IDS" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-device-ids \- Understanding Device IDs
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-DEVICE-IDS" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-device-ids \- Understanding Device IDs
 .sp
 Every device is identified by a device ID. The device ID is used for address
 resolution, authentication and authorization. The term “device ID” could

man/syncthing-event-api.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-EVENT-API" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-event-api \- Event API
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-EVENT-API" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-event-api \- Event API
 .SH DESCRIPTION
 .sp
 Syncthing provides a simple long polling interface for exposing events from the

man/syncthing-faq.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-FAQ" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-faq \- Frequently Asked Questions
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-FAQ" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-faq \- Frequently Asked Questions
 .INDENT 0.0
 .IP \(bu 2
 \fI\%General\fP
@@ -331,14 +331,14 @@ ensures that we get a nice log file to help us narrow down the cause for
 crashes and other bugs.
 .SS How can I view the history of changes?
 .sp
-The web GUI contains a \fBGlobal Changes\fP button under the device list which
+The web GUI contains a \fBRecent Changes\fP button under the device list which
 displays changes since the last (re)start of Syncthing. With the \fB\-audit\fP
 option you can enable a persistent, detailed log of changes and most
 activities, which contains a \fBJSON\fP formatted  sequence of events in the
 \fB~/.config/syncthing/audit\-_date_\-_time_.log\fP file.
 .SS Does the audit log contain every change?
 .sp
-The audit log (and the \fBGlobal Changes\fP window) sees the changes that your
+The audit log (and the \fBRecent Changes\fP window) sees the changes that your
 Syncthing sees. When Syncthing is continuously connected it usually sees every change
 happening immediately and thus knows which node initiated the change.
 When topology gets complex or when your node reconnects after some time offline,

man/syncthing-globaldisco.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-GLOBALDISCO" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-globaldisco \- Global Discovery Protocol v3
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-GLOBALDISCO" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-globaldisco \- Global Discovery Protocol v3
 .SH ANNOUNCEMENTS
 .sp
 A device should announce itself at startup. It does this by an HTTPS POST to

man/syncthing-localdisco.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-LOCALDISCO" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-localdisco \- Local Discovery Protocol v4
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-LOCALDISCO" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-localdisco \- Local Discovery Protocol v4
 .SH MODE OF OPERATION
 .sp
 Each participating device periodically sends an Announcement packet. It also

man/syncthing-networking.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-NETWORKING" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-networking \- Firewall Setup
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-NETWORKING" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-networking \- Firewall Setup
 .SH ROUTER SETUP
 .SS Port Forwards
 .sp

man/syncthing-relay.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-RELAY" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-relay \- Relay Protocol v1
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-RELAY" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-relay \- Relay Protocol v1
 .SH WHAT IS A RELAY?
 .sp
 Relay is a service which relays data between two \fIdevices\fP which are not able to

man/syncthing-rest-api.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-REST-API" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-rest-api \- REST API
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-REST-API" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-rest-api \- REST API
 .sp
 Syncthing exposes a REST interface over HTTP on the GUI port. This is used by
 the GUI (from Javascript) and can be used by other processes wishing to control

man/syncthing-security.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-SECURITY" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-security \- Security Principles
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-SECURITY" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-security \- Security Principles
 .sp
 Security is one of the primary project goals. This means that it should not be
 possible for an attacker to join a cluster uninvited, and it should not be

man/syncthing-stignore.5

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-STIGNORE" "5" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-stignore \- Prevent files from being synchronized to other nodes
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-STIGNORE" "5" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-stignore \- Prevent files from being synchronized to other nodes
 .SH SYNOPSIS
 .INDENT 0.0
 .INDENT 3.5

man/syncthing-versioning.7

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING-VERSIONING" "7" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing-versioning \- Keep automatic backups of deleted files by other nodes
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING-VERSIONING" "7" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing-versioning \- Keep automatic backups of deleted files by other nodes
 .sp
 Syncthing supports archiving the old version of a file when it is deleted or
 replaced with a newer version from the cluster. This is called “file

man/syncthing.1

@@ -1,8 +1,5 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "SYNCTHING" "1" "Apr 15, 2021" "v1" "Syncthing"
-.SH NAME
-syncthing \- Syncthing
 .
 .nr rst2man-indent-level 0
 .
@@ -30,6 +27,9 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
+.TH "SYNCTHING" "1" "Apr 26, 2021" "v1" "Syncthing"
+.SH NAME
+syncthing \- Syncthing
 .SH SYNOPSIS
 .INDENT 0.0
 .INDENT 3.5

next-gen-gui/src/app/device.ts

@@ -95,7 +95,7 @@ namespace Device {
 
     export function recalcCompletion(d: Device) {
         if (!d || !d.completion || !d.folders) {
-            return
+            return;
         }
         var total = 0, needed = 0, deletes = 0, items = 0;
         d.folders.forEach(folder => {
@@ -123,4 +123,4 @@ namespace Device {
         }
     }
 }
-export default Device;
+export default Device;

proto/lib/config/optionsconfiguration.proto

@@ -67,6 +67,10 @@ message OptionsConfiguration {
     // attempting outgoing connections.
     int32 connection_limit_max = 52;
 
+    // When set, this allows TLS 1.2 on sync connections, where we otherwise
+    // default to TLS 1.3+ only.
+    bool insecure_allow_old_tls_versions = 53 [(ext.goname)= "InsecureAllowOldTLSVersions", (ext.xml) = "insecureAllowOldTLSVersions", (ext.json) = "insecureAllowOldTLSVersions"];
+
     // Legacy deprecated
     bool            upnp_enabled           = 9000 [deprecated = true, (ext.goname) = "DeprecatedUPnPEnabled"];
     int32           upnp_lease_m           = 9001 [deprecated = true, (ext.goname) = "DeprecatedUPnPLeaseM", (ext.xml) = "upnpLeaseMinutes,omitempty"];

script/deb-post-inst.template

@@ -10,5 +10,5 @@ fi
 if [ $has_systemd -eq 0 ] && [ -n "$(systemctl list-units --plain --no-legend {{.Service}})" ]; then
     deb-systemd-invoke try-restart "{{.Service}}"
 else
-    pkill -HUP -x {{.Command}}
+    pkill -HUP -x {{.Command}} || :
 fi

script/prune_mocks.go

@@ -35,7 +35,7 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
-		err = exec.Command("goimports", "-w", path).Run()
+		err = exec.Command("go", "run", "golang.org/x/tools/cmd/goimports", "-w", path).Run()
 		if err != nil {
 			log.Fatal(err)
 		}

tools.go

@@ -0,0 +1,14 @@
+// This file is never built. It serves to establish dependencies on tools
+// used by go generate and build.go. See
+// https://github.com/golang/go/wiki/Modules#how-can-i-track-tool-dependencies-for-a-module
+
+// +build tools
+
+package tools
+
+import (
+	_ "github.com/calmh/xdr"
+	_ "github.com/gogo/protobuf/protoc-gen-gogofast"
+	_ "github.com/maxbrunsfeld/counterfeiter/v6"
+	_ "golang.org/x/tools/cmd/goimports"
+)