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Add 'lib/protocol/' from commit 'f91191218b192ace841c878f161832d19c09145a' 

git-subtree-dir: lib/protocol
git-subtree-mainline: 5ecb8bdd8a
git-subtree-split: f91191218b
This commit is contained in:
Jakob Borg 2015-09-22 19:34:29 +02:00
parent 5ecb8bdd8a f91191218b
commit 4316992d95
30 changed files with 4101 additions and 0 deletions
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4
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# This is the official list of Protocol Authors for copyright purposes.
Audrius Butkevicius <audrius.butkevicius@gmail.com>
Jakob Borg <jakob@nym.se>

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## Reporting Bugs
Please file bugs in the [Github Issue
Tracker](https://github.com/syncthing/protocol/issues).
## Contributing Code
Every contribution is welcome. Following the points below will make this
a smoother process.
Individuals making significant and valuable contributions are given
commit-access to the project. If you make a significant contribution and
are not considered for commit-access, please contact any of the
Syncthing core team members.
All nontrivial contributions should go through the pull request
mechanism for internal review. Determining what is "nontrivial" is left
at the discretion of the contributor.
### Authorship
All code authors are listed in the AUTHORS file. Commits must be made
with the same name and email as listed in the AUTHORS file. To
accomplish this, ensure that your git configuration is set correctly
prior to making your first commit;
$ git config --global user.name "Jane Doe"
$ git config --global user.email janedoe@example.com
You must be reachable on the given email address. If you do not wish to
use your real name for whatever reason, using a nickname or pseudonym is
perfectly acceptable.
## Coding Style
- Follow the conventions laid out in [Effective Go](https://golang.org/doc/effective_go.html)
as much as makes sense.
- All text files use Unix line endings.
- Each commit should be `go fmt` clean.
- The commit message subject should be a single short sentence
describing the change, starting with a capital letter.
- Commits that resolve an existing issue must include the issue number
as `(fixes #123)` at the end of the commit message subject.
- Imports are grouped per `goimports` standard; that is, standard
library first, then third party libraries after a blank line.
- A contribution solving a single issue or introducing a single new
feature should probably be a single commit based on the current
`master` branch. You may be asked to "rebase" or "squash" your pull
request to make sure this is the case, especially if there have been
amendments during review.
## Licensing
All contributions are made under the same MIT license as the rest of the
project, except documentation, user interface text and translation
strings which are licensed under the Creative Commons Attribution 4.0
International License. You retain the copyright to code you have
written.
When accepting your first contribution, the maintainer of the project
will ensure that you are added to the AUTHORS file. You are welcome to
add yourself as a separate commit in your first pull request.
## Tests
Yes please!
## License
MIT

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Copyright (C) 2014-2015 The Protocol Authors
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
- The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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The BEPv1 Protocol
==================
[![Latest Build](http://img.shields.io/jenkins/s/http/build.syncthing.net/protocol.svg?style=flat-square)](http://build.syncthing.net/job/protocol/lastBuild/)
[![API Documentation](http://img.shields.io/badge/api-Godoc-blue.svg?style=flat-square)](http://godoc.org/github.com/syncthing/protocol)
[![MIT License](http://img.shields.io/badge/license-MIT-blue.svg?style=flat-square)](http://opensource.org/licenses/MIT)
This is the protocol implementation used by Syncthing.
License
=======
MIT

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"io"
"time"
)
type TestModel struct {
data []byte
folder string
name string
offset int64
size int
hash []byte
flags uint32
options []Option
closedCh chan bool
}
func newTestModel() *TestModel {
return &TestModel{
closedCh: make(chan bool),
}
}
func (t *TestModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
}
func (t *TestModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
}
func (t *TestModel) Request(deviceID DeviceID, folder, name string, offset int64, hash []byte, flags uint32, options []Option, buf []byte) error {
t.folder = folder
t.name = name
t.offset = offset
t.size = len(buf)
t.hash = hash
t.flags = flags
t.options = options
copy(buf, t.data)
return nil
}
func (t *TestModel) Close(deviceID DeviceID, err error) {
close(t.closedCh)
}
func (t *TestModel) ClusterConfig(deviceID DeviceID, config ClusterConfigMessage) {
}
func (t *TestModel) isClosed() bool {
select {
case <-t.closedCh:
return true
case <-time.After(1 * time.Second):
return false // Timeout
}
}
type ErrPipe struct {
io.PipeWriter
written int
max int
err error
closed bool
}
func (e *ErrPipe) Write(data []byte) (int, error) {
if e.closed {
return 0, e.err
}
if e.written+len(data) > e.max {
n, _ := e.PipeWriter.Write(data[:e.max-e.written])
e.PipeWriter.CloseWithError(e.err)
e.closed = true
return n, e.err
}
return e.PipeWriter.Write(data)
}

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// Copyright (C) 2015 The Protocol Authors.
package protocol
import "fmt"
type Compression int
const (
CompressMetadata Compression = iota // zero value is the default, default should be "metadata"
CompressNever
CompressAlways
compressionThreshold = 128 // don't bother compressing messages smaller than this many bytes
)
var compressionMarshal = map[Compression]string{
CompressNever: "never",
CompressMetadata: "metadata",
CompressAlways: "always",
}
var compressionUnmarshal = map[string]Compression{
// Legacy
"false": CompressNever,
"true": CompressMetadata,
// Current
"never": CompressNever,
"metadata": CompressMetadata,
"always": CompressAlways,
}
func (c Compression) String() string {
s, ok := compressionMarshal[c]
if !ok {
return fmt.Sprintf("unknown:%d", c)
}
return s
}
func (c Compression) GoString() string {
return fmt.Sprintf("%q", c.String())
}
func (c Compression) MarshalText() ([]byte, error) {
return []byte(compressionMarshal[c]), nil
}
func (c *Compression) UnmarshalText(bs []byte) error {
*c = compressionUnmarshal[string(bs)]
return nil
}

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// Copyright (C) 2015 The Protocol Authors.
package protocol
import "testing"
func TestCompressionMarshal(t *testing.T) {
uTestcases := []struct {
s string
c Compression
}{
{"true", CompressMetadata},
{"false", CompressNever},
{"never", CompressNever},
{"metadata", CompressMetadata},
{"always", CompressAlways},
{"whatever", CompressMetadata},
}
mTestcases := []struct {
s string
c Compression
}{
{"never", CompressNever},
{"metadata", CompressMetadata},
{"always", CompressAlways},
}
var c Compression
for _, tc := range uTestcases {
err := c.UnmarshalText([]byte(tc.s))
if err != nil {
t.Error(err)
}
if c != tc.c {
t.Errorf("%s unmarshalled to %d, not %d", tc.s, c, tc.c)
}
}
for _, tc := range mTestcases {
bs, err := tc.c.MarshalText()
if err != nil {
t.Error(err)
}
if s := string(bs); s != tc.s {
t.Errorf("%d marshalled to %q, not %q", tc.c, s, tc.s)
}
}
}

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// Copyright (C) 2015 The Protocol Authors.
package protocol
import "testing"
func TestWinsConflict(t *testing.T) {
testcases := [][2]FileInfo{
// The first should always win over the second
{{Modified: 42}, {Modified: 41}},
{{Modified: 41}, {Modified: 42, Flags: FlagDeleted}},
{{Modified: 41, Version: Vector{{42, 2}, {43, 1}}}, {Modified: 41, Version: Vector{{42, 1}, {43, 2}}}},
}
for _, tc := range testcases {
if !tc[0].WinsConflict(tc[1]) {
t.Errorf("%v should win over %v", tc[0], tc[1])
}
if tc[1].WinsConflict(tc[0]) {
t.Errorf("%v should not win over %v", tc[1], tc[0])
}
}
}

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"io"
"sync/atomic"
"time"
)
type countingReader struct {
io.Reader
tot int64 // bytes
last int64 // unix nanos
}
var (
totalIncoming int64
totalOutgoing int64
)
func (c *countingReader) Read(bs []byte) (int, error) {
n, err := c.Reader.Read(bs)
atomic.AddInt64(&c.tot, int64(n))
atomic.AddInt64(&totalIncoming, int64(n))
atomic.StoreInt64(&c.last, time.Now().UnixNano())
return n, err
}
func (c *countingReader) Tot() int64 {
return atomic.LoadInt64(&c.tot)
}
func (c *countingReader) Last() time.Time {
return time.Unix(0, atomic.LoadInt64(&c.last))
}
type countingWriter struct {
io.Writer
tot int64 // bytes
last int64 // unix nanos
}
func (c *countingWriter) Write(bs []byte) (int, error) {
n, err := c.Writer.Write(bs)
atomic.AddInt64(&c.tot, int64(n))
atomic.AddInt64(&totalOutgoing, int64(n))
atomic.StoreInt64(&c.last, time.Now().UnixNano())
return n, err
}
func (c *countingWriter) Tot() int64 {
return atomic.LoadInt64(&c.tot)
}
func (c *countingWriter) Last() time.Time {
return time.Unix(0, atomic.LoadInt64(&c.last))
}
func TotalInOut() (int64, int64) {
return atomic.LoadInt64(&totalIncoming), atomic.LoadInt64(&totalOutgoing)
}

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"os"
"strings"
"github.com/calmh/logger"
)
var (
debug = strings.Contains(os.Getenv("STTRACE"), "protocol") || os.Getenv("STTRACE") == "all"
l = logger.DefaultLogger
)

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"bytes"
"crypto/sha256"
"encoding/base32"
"encoding/binary"
"errors"
"fmt"
"regexp"
"strings"
"github.com/calmh/luhn"
)
type DeviceID [32]byte
var LocalDeviceID = DeviceID{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
// NewDeviceID generates a new device ID from the raw bytes of a certificate
func NewDeviceID(rawCert []byte) DeviceID {
var n DeviceID
hf := sha256.New()
hf.Write(rawCert)
hf.Sum(n[:0])
return n
}
func DeviceIDFromString(s string) (DeviceID, error) {
var n DeviceID
err := n.UnmarshalText([]byte(s))
return n, err
}
func DeviceIDFromBytes(bs []byte) DeviceID {
var n DeviceID
if len(bs) != len(n) {
panic("incorrect length of byte slice representing device ID")
}
copy(n[:], bs)
return n
}
// String returns the canonical string representation of the device ID
func (n DeviceID) String() string {
id := base32.StdEncoding.EncodeToString(n[:])
id = strings.Trim(id, "=")
id, err := luhnify(id)
if err != nil {
// Should never happen
panic(err)
}
id = chunkify(id)
return id
}
func (n DeviceID) GoString() string {
return n.String()
}
func (n DeviceID) Compare(other DeviceID) int {
return bytes.Compare(n[:], other[:])
}
func (n DeviceID) Equals(other DeviceID) bool {
return bytes.Compare(n[:], other[:]) == 0
}
// Short returns an integer representing bits 0-63 of the device ID.
func (n DeviceID) Short() uint64 {
return binary.BigEndian.Uint64(n[:])
}
func (n *DeviceID) MarshalText() ([]byte, error) {
return []byte(n.String()), nil
}
func (n *DeviceID) UnmarshalText(bs []byte) error {
id := string(bs)
id = strings.Trim(id, "=")
id = strings.ToUpper(id)
id = untypeoify(id)
id = unchunkify(id)
var err error
switch len(id) {
case 56:
// New style, with check digits
id, err = unluhnify(id)
if err != nil {
return err
}
fallthrough
case 52:
// Old style, no check digits
dec, err := base32.StdEncoding.DecodeString(id + "====")
if err != nil {
return err
}
copy(n[:], dec)
return nil
default:
return errors.New("device ID invalid: incorrect length")
}
}
func luhnify(s string) (string, error) {
if len(s) != 52 {
panic("unsupported string length")
}
res := make([]string, 0, 4)
for i := 0; i < 4; i++ {
p := s[i*13 : (i+1)*13]
l, err := luhn.Base32.Generate(p)
if err != nil {
return "", err
}
res = append(res, fmt.Sprintf("%s%c", p, l))
}
return res[0] + res[1] + res[2] + res[3], nil
}
func unluhnify(s string) (string, error) {
if len(s) != 56 {
return "", fmt.Errorf("unsupported string length %d", len(s))
}
res := make([]string, 0, 4)
for i := 0; i < 4; i++ {
p := s[i*14 : (i+1)*14-1]
l, err := luhn.Base32.Generate(p)
if err != nil {
return "", err
}
if g := fmt.Sprintf("%s%c", p, l); g != s[i*14:(i+1)*14] {
return "", errors.New("check digit incorrect")
}
res = append(res, p)
}
return res[0] + res[1] + res[2] + res[3], nil
}
func chunkify(s string) string {
s = regexp.MustCompile("(.{7})").ReplaceAllString(s, "$1-")
s = strings.Trim(s, "-")
return s
}
func unchunkify(s string) string {
s = strings.Replace(s, "-", "", -1)
s = strings.Replace(s, " ", "", -1)
return s
}
func untypeoify(s string) string {
s = strings.Replace(s, "0", "O", -1)
s = strings.Replace(s, "1", "I", -1)
s = strings.Replace(s, "8", "B", -1)
return s
}

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import "testing"
var formatted = "P56IOI7-MZJNU2Y-IQGDREY-DM2MGTI-MGL3BXN-PQ6W5BM-TBBZ4TJ-XZWICQ2"
var formatCases = []string{
"P56IOI-7MZJNU-2IQGDR-EYDM2M-GTMGL3-BXNPQ6-W5BTBB-Z4TJXZ-WICQ",
"P56IOI-7MZJNU2Y-IQGDR-EYDM2M-GTI-MGL3-BXNPQ6-W5BM-TBB-Z4TJXZ-WICQ2",
"P56IOI7 MZJNU2I QGDREYD M2MGTMGL 3BXNPQ6W 5BTB BZ4T JXZWICQ",
"P56IOI7 MZJNU2Y IQGDREY DM2MGTI MGL3BXN PQ6W5BM TBBZ4TJ XZWICQ2",
"P56IOI7MZJNU2IQGDREYDM2MGTMGL3BXNPQ6W5BTBBZ4TJXZWICQ",
"p56ioi7mzjnu2iqgdreydm2mgtmgl3bxnpq6w5btbbz4tjxzwicq",
"P56IOI7MZJNU2YIQGDREYDM2MGTIMGL3BXNPQ6W5BMTBBZ4TJXZWICQ2",
"P561017MZJNU2YIQGDREYDM2MGTIMGL3BXNPQ6W5BMT88Z4TJXZWICQ2",
"p56ioi7mzjnu2yiqgdreydm2mgtimgl3bxnpq6w5bmtbbz4tjxzwicq2",
"p561017mzjnu2yiqgdreydm2mgtimgl3bxnpq6w5bmt88z4tjxzwicq2",
}
func TestFormatDeviceID(t *testing.T) {
for i, tc := range formatCases {
var id DeviceID
err := id.UnmarshalText([]byte(tc))
if err != nil {
t.Errorf("#%d UnmarshalText(%q); %v", i, tc, err)
} else if f := id.String(); f != formatted {
t.Errorf("#%d FormatDeviceID(%q)\n\t%q !=\n\t%q", i, tc, f, formatted)
}
}
}
var validateCases = []struct {
s string
ok bool
}{
{"", false},
{"P56IOI7-MZJNU2Y-IQGDREY-DM2MGTI-MGL3BXN-PQ6W5BM-TBBZ4TJ-XZWICQ2", true},
{"P56IOI7-MZJNU2-IQGDREY-DM2MGT-MGL3BXN-PQ6W5B-TBBZ4TJ-XZWICQ", true},
{"P56IOI7 MZJNU2I QGDREYD M2MGTMGL 3BXNPQ6W 5BTB BZ4T JXZWICQ", true},
{"P56IOI7MZJNU2IQGDREYDM2MGTMGL3BXNPQ6W5BTBBZ4TJXZWICQ", true},
{"P56IOI7MZJNU2IQGDREYDM2MGTMGL3BXNPQ6W5BTBBZ4TJXZWICQCCCC", false},
{"p56ioi7mzjnu2iqgdreydm2mgtmgl3bxnpq6w5btbbz4tjxzwicq", true},
{"p56ioi7mzjnu2iqgdreydm2mgtmgl3bxnpq6w5btbbz4tjxzwicqCCCC", false},
}
func TestValidateDeviceID(t *testing.T) {
for _, tc := range validateCases {
var id DeviceID
err := id.UnmarshalText([]byte(tc.s))
if (err == nil && !tc.ok) || (err != nil && tc.ok) {
t.Errorf("ValidateDeviceID(%q); %v != %v", tc.s, err, tc.ok)
}
}
}
func TestMarshallingDeviceID(t *testing.T) {
n0 := DeviceID{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 10, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32}
n1 := DeviceID{}
n2 := DeviceID{}
bs, _ := n0.MarshalText()
n1.UnmarshalText(bs)
bs, _ = n1.MarshalText()
n2.UnmarshalText(bs)
if n2.String() != n0.String() {
t.Errorf("String marshalling error; %q != %q", n2.String(), n0.String())
}
if !n2.Equals(n0) {
t.Error("Equals error")
}
if n2.Compare(n0) != 0 {
t.Error("Compare error")
}
}

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// Copyright (C) 2014 The Protocol Authors.
// Package protocol implements the Block Exchange Protocol.
package protocol

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"errors"
)
const (
ecNoError int32 = iota
ecGeneric
ecNoSuchFile
ecInvalid
)
var (
ErrNoError error = nil
ErrGeneric = errors.New("generic error")
ErrNoSuchFile = errors.New("no such file")
ErrInvalid = errors.New("file is invalid")
)
var lookupError = map[int32]error{
ecNoError: ErrNoError,
ecGeneric: ErrGeneric,
ecNoSuchFile: ErrNoSuchFile,
ecInvalid: ErrInvalid,
}
var lookupCode = map[error]int32{
ErrNoError: ecNoError,
ErrGeneric: ecGeneric,
ErrNoSuchFile: ecNoSuchFile,
ErrInvalid: ecInvalid,
}
func codeToError(errcode int32) error {
err, ok := lookupError[errcode]
if !ok {
return ErrGeneric
}
return err
}
func errorToCode(err error) int32 {
code, ok := lookupCode[err]
if !ok {
return ecGeneric
}
return code
}

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// Copyright (C) 2015 The Protocol Authors.
// +build gofuzz
package protocol
import (
"bytes"
"encoding/binary"
"encoding/hex"
"fmt"
"reflect"
"sync"
)
func Fuzz(data []byte) int {
// Regenerate the length, or we'll most commonly exit quickly due to an
// unexpected eof which is unintestering.
if len(data) > 8 {
binary.BigEndian.PutUint32(data[4:], uint32(len(data))-8)
}
// Setup a rawConnection we'll use to parse the message.
c := rawConnection{
cr: &countingReader{Reader: bytes.NewReader(data)},
closed: make(chan struct{}),
pool: sync.Pool{
New: func() interface{} {
return make([]byte, BlockSize)
},
},
}
// Attempt to parse the message.
hdr, msg, err := c.readMessage()
if err != nil {
return 0
}
// If parsing worked, attempt to encode it again.
newBs, err := msg.AppendXDR(nil)
if err != nil {
panic("not encodable")
}
// Create an appriate header for the re-encoding.
newMsg := make([]byte, 8)
binary.BigEndian.PutUint32(newMsg, encodeHeader(hdr))
binary.BigEndian.PutUint32(newMsg[4:], uint32(len(newBs)))
newMsg = append(newMsg, newBs...)
// Use the rawConnection to parse the re-encoding.
c.cr = &countingReader{Reader: bytes.NewReader(newMsg)}
hdr2, msg2, err := c.readMessage()
if err != nil {
fmt.Println("Initial:\n" + hex.Dump(data))
fmt.Println("New:\n" + hex.Dump(newMsg))
panic("not parseable after re-encode: " + err.Error())
}
// Make sure the data is the same as it was before.
if hdr != hdr2 {
panic("headers differ")
}
if !reflect.DeepEqual(msg, msg2) {
panic("contents differ")
}
return 1
}

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// Copyright (C) 2015 The Protocol Authors.
// +build gofuzz
package protocol
import (
"encoding/binary"
"fmt"
"io/ioutil"
"os"
"strings"
"testing"
"testing/quick"
)
// This can be used to generate a corpus of valid messages as a starting point
// for the fuzzer.
func TestGenerateCorpus(t *testing.T) {
t.Skip("Use to generate initial corpus only")
n := 0
check := func(idx IndexMessage) bool {
for i := range idx.Options {
if len(idx.Options[i].Key) > 64 {
idx.Options[i].Key = idx.Options[i].Key[:64]
}
}
hdr := header{
version: 0,
msgID: 42,
msgType: messageTypeIndex,
compression: false,
}
msgBs := idx.MustMarshalXDR()
buf := make([]byte, 8)
binary.BigEndian.PutUint32(buf, encodeHeader(hdr))
binary.BigEndian.PutUint32(buf[4:], uint32(len(msgBs)))
buf = append(buf, msgBs...)
ioutil.WriteFile(fmt.Sprintf("testdata/corpus/test-%03d.xdr", n), buf, 0644)
n++
return true
}
if err := quick.Check(check, &quick.Config{MaxCount: 1000}); err != nil {
t.Fatal(err)
}
}
// Tests any crashers found by the fuzzer, for closer investigation.
func TestCrashers(t *testing.T) {
testFiles(t, "testdata/crashers")
}
// Tests the entire corpus, which should PASS before the fuzzer starts
// fuzzing.
func TestCorpus(t *testing.T) {
testFiles(t, "testdata/corpus")
}
func testFiles(t *testing.T, dir string) {
fd, err := os.Open(dir)
if err != nil {
t.Fatal(err)
}
crashers, err := fd.Readdirnames(-1)
if err != nil {
t.Fatal(err)
}
for _, name := range crashers {
if strings.HasSuffix(name, ".output") {
continue
}
if strings.HasSuffix(name, ".quoted") {
continue
}
t.Log(name)
crasher, err := ioutil.ReadFile(dir + "/" + name)
if err != nil {
t.Fatal(err)
}
Fuzz(crasher)
}
}

43
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// Copyright (C) 2014 The Protocol Authors.
package protocol
import "github.com/calmh/xdr"
type header struct {
version int
msgID int
msgType int
compression bool
}
func (h header) encodeXDR(xw *xdr.Writer) (int, error) {
u := encodeHeader(h)
return xw.WriteUint32(u)
}
func (h *header) decodeXDR(xr *xdr.Reader) error {
u := xr.ReadUint32()
*h = decodeHeader(u)
return xr.Error()
}
func encodeHeader(h header) uint32 {
var isComp uint32
if h.compression {
isComp = 1 << 0 // the zeroth bit is the compression bit
}
return uint32(h.version&0xf)<<28 +
uint32(h.msgID&0xfff)<<16 +
uint32(h.msgType&0xff)<<8 +
isComp
}
func decodeHeader(u uint32) header {
return header{
version: int(u>>28) & 0xf,
msgID: int(u>>16) & 0xfff,
msgType: int(u>>8) & 0xff,
compression: u&1 == 1,
}
}

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// Copyright (C) 2014 The Protocol Authors.
//go:generate -command genxdr go run ../syncthing/Godeps/_workspace/src/github.com/calmh/xdr/cmd/genxdr/main.go
//go:generate genxdr -o message_xdr.go message.go
package protocol
import "fmt"
type IndexMessage struct {
Folder string
Files []FileInfo // max:1000000
Flags uint32
Options []Option // max:64
}
type FileInfo struct {
Name string // max:8192
Flags uint32
Modified int64
Version Vector
LocalVersion int64
CachedSize int64 // noencode (cache only)
Blocks []BlockInfo // max:1000000
}
func (f FileInfo) String() string {
return fmt.Sprintf("File{Name:%q, Flags:0%o, Modified:%d, Version:%v, Size:%d, Blocks:%v}",
f.Name, f.Flags, f.Modified, f.Version, f.Size(), f.Blocks)
}
func (f FileInfo) Size() (bytes int64) {
if f.IsDeleted() || f.IsDirectory() {
return 128
}
for _, b := range f.Blocks {
bytes += int64(b.Size)
}
return
}
func (f FileInfo) IsDeleted() bool {
return f.Flags&FlagDeleted != 0
}
func (f FileInfo) IsInvalid() bool {
return f.Flags&FlagInvalid != 0
}
func (f FileInfo) IsDirectory() bool {
return f.Flags&FlagDirectory != 0
}
func (f FileInfo) IsSymlink() bool {
return f.Flags&FlagSymlink != 0
}
func (f FileInfo) HasPermissionBits() bool {
return f.Flags&FlagNoPermBits == 0
}
// WinsConflict returns true if "f" is the one to choose when it is in
// conflict with "other".
func (f FileInfo) WinsConflict(other FileInfo) bool {
// If a modification is in conflict with a delete, we pick the
// modification.
if !f.IsDeleted() && other.IsDeleted() {
return true
}
if f.IsDeleted() && !other.IsDeleted() {
return false
}
// The one with the newer modification time wins.
if f.Modified > other.Modified {
return true
}
if f.Modified < other.Modified {
return false
}
// The modification times were equal. Use the device ID in the version
// vector as tie breaker.
return f.Version.Compare(other.Version) == ConcurrentGreater
}
type BlockInfo struct {
Offset int64 // noencode (cache only)
Size int32
Hash []byte // max:64
}
func (b BlockInfo) String() string {
return fmt.Sprintf("Block{%d/%d/%x}", b.Offset, b.Size, b.Hash)
}
type RequestMessage struct {
Folder string // max:64
Name string // max:8192
Offset int64
Size int32
Hash []byte // max:64
Flags uint32
Options []Option // max:64
}
type ResponseMessage struct {
Data []byte
Code int32
}
type ClusterConfigMessage struct {
ClientName string // max:64
ClientVersion string // max:64
Folders []Folder // max:1000000
Options []Option // max:64
}
func (o *ClusterConfigMessage) GetOption(key string) string {
for _, option := range o.Options {
if option.Key == key {
return option.Value
}
}
return ""
}
type Folder struct {
ID string // max:64
Devices []Device // max:1000000
Flags uint32
Options []Option // max:64
}
type Device struct {
ID []byte // max:32
MaxLocalVersion int64
Flags uint32
Options []Option // max:64
}
type Option struct {
Key string // max:64
Value string // max:1024
}
type CloseMessage struct {
Reason string // max:1024
Code int32
}
type EmptyMessage struct{}

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lib/protocol/nativemodel_darwin.go Normal file
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// Copyright (C) 2014 The Protocol Authors.
// +build darwin
package protocol
// Darwin uses NFD normalization
import "golang.org/x/text/unicode/norm"
type nativeModel struct {
next Model
}
func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
for i := range files {
files[i].Name = norm.NFD.String(files[i].Name)
}
m.next.Index(deviceID, folder, files, flags, options)
}
func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
for i := range files {
files[i].Name = norm.NFD.String(files[i].Name)
}
m.next.IndexUpdate(deviceID, folder, files, flags, options)
}
func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, hash []byte, flags uint32, options []Option, buf []byte) error {
name = norm.NFD.String(name)
return m.next.Request(deviceID, folder, name, offset, hash, flags, options, buf)
}
func (m nativeModel) ClusterConfig(deviceID DeviceID, config ClusterConfigMessage) {
m.next.ClusterConfig(deviceID, config)
}
func (m nativeModel) Close(deviceID DeviceID, err error) {
m.next.Close(deviceID, err)
}

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// Copyright (C) 2014 The Protocol Authors.
// +build !windows,!darwin
package protocol
// Normal Unixes uses NFC and slashes, which is the wire format.
type nativeModel struct {
next Model
}
func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
m.next.Index(deviceID, folder, files, flags, options)
}
func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
m.next.IndexUpdate(deviceID, folder, files, flags, options)
}
func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, hash []byte, flags uint32, options []Option, buf []byte) error {
return m.next.Request(deviceID, folder, name, offset, hash, flags, options, buf)
}
func (m nativeModel) ClusterConfig(deviceID DeviceID, config ClusterConfigMessage) {
m.next.ClusterConfig(deviceID, config)
}
func (m nativeModel) Close(deviceID DeviceID, err error) {
m.next.Close(deviceID, err)
}

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// Copyright (C) 2014 The Protocol Authors.
// +build windows
package protocol
// Windows uses backslashes as file separator and disallows a bunch of
// characters in the filename
import (
"path/filepath"
"strings"
)
var disallowedCharacters = string([]rune{
'<', '>', ':', '"', '|', '?', '*',
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
31,
})
type nativeModel struct {
next Model
}
func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
fixupFiles(folder, files)
m.next.Index(deviceID, folder, files, flags, options)
}
func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
fixupFiles(folder, files)
m.next.IndexUpdate(deviceID, folder, files, flags, options)
}
func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, hash []byte, flags uint32, options []Option, buf []byte) error {
name = filepath.FromSlash(name)
return m.next.Request(deviceID, folder, name, offset, hash, flags, options, buf)
}
func (m nativeModel) ClusterConfig(deviceID DeviceID, config ClusterConfigMessage) {
m.next.ClusterConfig(deviceID, config)
}
func (m nativeModel) Close(deviceID DeviceID, err error) {
m.next.Close(deviceID, err)
}
func fixupFiles(folder string, files []FileInfo) {
for i, f := range files {
if strings.ContainsAny(f.Name, disallowedCharacters) {
if f.IsDeleted() {
// Don't complain if the file is marked as deleted, since it
// can't possibly exist here anyway.
continue
}
files[i].Flags |= FlagInvalid
l.Warnf("File name %q (folder %q) contains invalid characters; marked as invalid.", f.Name, folder)
}
files[i].Name = filepath.FromSlash(files[i].Name)
}
}

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"sync"
"time"
lz4 "github.com/bkaradzic/go-lz4"
)
const (
// Data block size (128 KiB)
BlockSize = 128 << 10
// We reject messages larger than this when encountered on the wire. (64 MiB)
MaxMessageLen = 64 << 20
)
const (
messageTypeClusterConfig = 0
messageTypeIndex = 1
messageTypeRequest = 2
messageTypeResponse = 3
messageTypePing = 4
messageTypeIndexUpdate = 6
messageTypeClose = 7
)
const (
stateInitial = iota
stateReady
)
// FileInfo flags
const (
FlagDeleted uint32 = 1 << 12
FlagInvalid = 1 << 13
FlagDirectory = 1 << 14
FlagNoPermBits = 1 << 15
FlagSymlink = 1 << 16
FlagSymlinkMissingTarget = 1 << 17
FlagsAll = (1 << 18) - 1
SymlinkTypeMask = FlagDirectory | FlagSymlinkMissingTarget
)
// IndexMessage message flags (for IndexUpdate)
const (
FlagIndexTemporary uint32 = 1 << iota
)
// Request message flags
const (
FlagRequestTemporary uint32 = 1 << iota
)
// ClusterConfigMessage.Folders.Devices flags
const (
FlagShareTrusted uint32 = 1 << 0
FlagShareReadOnly = 1 << 1
FlagIntroducer = 1 << 2
FlagShareBits = 0x000000ff
)
var (
ErrClosed = errors.New("connection closed")
ErrTimeout = errors.New("read timeout")
)
// Specific variants of empty messages...
type pingMessage struct{ EmptyMessage }
type Model interface {
// An index was received from the peer device
Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option)
// An index update was received from the peer device
IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option)
// A request was made by the peer device
Request(deviceID DeviceID, folder string, name string, offset int64, hash []byte, flags uint32, options []Option, buf []byte) error
// A cluster configuration message was received
ClusterConfig(deviceID DeviceID, config ClusterConfigMessage)
// The peer device closed the connection
Close(deviceID DeviceID, err error)
}
type Connection interface {
Start()
ID() DeviceID
Name() string
Index(folder string, files []FileInfo, flags uint32, options []Option) error
IndexUpdate(folder string, files []FileInfo, flags uint32, options []Option) error
Request(folder string, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error)
ClusterConfig(config ClusterConfigMessage)
Statistics() Statistics
}
type rawConnection struct {
id DeviceID
name string
receiver Model
cr *countingReader
cw *countingWriter
awaiting [4096]chan asyncResult
awaitingMut sync.Mutex
idxMut sync.Mutex // ensures serialization of Index calls
nextID chan int
outbox chan hdrMsg
closed chan struct{}
once sync.Once
pool sync.Pool
compression Compression
rdbuf0 []byte // used & reused by readMessage
rdbuf1 []byte // used & reused by readMessage
}
type asyncResult struct {
val []byte
err error
}
type hdrMsg struct {
hdr header
msg encodable
done chan struct{}
}
type encodable interface {
AppendXDR([]byte) ([]byte, error)
}
type isEofer interface {
IsEOF() bool
}
const (
// We make sure to send a message at least this often, by triggering pings.
PingSendInterval = 90 * time.Second
// If we haven't received a message from the other side for this long, close the connection.
ReceiveTimeout = 300 * time.Second
)
func NewConnection(deviceID DeviceID, reader io.Reader, writer io.Writer, receiver Model, name string, compress Compression) Connection {
cr := &countingReader{Reader: reader}
cw := &countingWriter{Writer: writer}
c := rawConnection{
id: deviceID,
name: name,
receiver: nativeModel{receiver},
cr: cr,
cw: cw,
outbox: make(chan hdrMsg),
nextID: make(chan int),
closed: make(chan struct{}),
pool: sync.Pool{
New: func() interface{} {
return make([]byte, BlockSize)
},
},
compression: compress,
}
return wireFormatConnection{&c}
}
// Start creates the goroutines for sending and receiving of messages. It must
// be called exactly once after creating a connection.
func (c *rawConnection) Start() {
go c.readerLoop()
go c.writerLoop()
go c.pingSender()
go c.pingReceiver()
go c.idGenerator()
}
func (c *rawConnection) ID() DeviceID {
return c.id
}
func (c *rawConnection) Name() string {
return c.name
}
// Index writes the list of file information to the connected peer device
func (c *rawConnection) Index(folder string, idx []FileInfo, flags uint32, options []Option) error {
select {
case <-c.closed:
return ErrClosed
default:
}
c.idxMut.Lock()
c.send(-1, messageTypeIndex, IndexMessage{
Folder: folder,
Files: idx,
Flags: flags,
Options: options,
}, nil)
c.idxMut.Unlock()
return nil
}
// IndexUpdate writes the list of file information to the connected peer device as an update
func (c *rawConnection) IndexUpdate(folder string, idx []FileInfo, flags uint32, options []Option) error {
select {
case <-c.closed:
return ErrClosed
default:
}
c.idxMut.Lock()
c.send(-1, messageTypeIndexUpdate, IndexMessage{
Folder: folder,
Files: idx,
Flags: flags,
Options: options,
}, nil)
c.idxMut.Unlock()
return nil
}
// Request returns the bytes for the specified block after fetching them from the connected peer.
func (c *rawConnection) Request(folder string, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error) {
var id int
select {
case id = <-c.nextID:
case <-c.closed:
return nil, ErrClosed
}
c.awaitingMut.Lock()
if ch := c.awaiting[id]; ch != nil {
panic("id taken")
}
rc := make(chan asyncResult, 1)
c.awaiting[id] = rc
c.awaitingMut.Unlock()
ok := c.send(id, messageTypeRequest, RequestMessage{
Folder: folder,
Name: name,
Offset: offset,
Size: int32(size),
Hash: hash,
Flags: flags,
Options: options,
}, nil)
if !ok {
return nil, ErrClosed
}
res, ok := <-rc
if !ok {
return nil, ErrClosed
}
return res.val, res.err
}
// ClusterConfig send the cluster configuration message to the peer and returns any error
func (c *rawConnection) ClusterConfig(config ClusterConfigMessage) {
c.send(-1, messageTypeClusterConfig, config, nil)
}
func (c *rawConnection) ping() bool {
var id int
select {
case id = <-c.nextID:
case <-c.closed:
return false
}
return c.send(id, messageTypePing, nil, nil)
}
func (c *rawConnection) readerLoop() (err error) {
defer func() {
c.close(err)
}()
state := stateInitial
for {
select {
case <-c.closed:
return ErrClosed
default:
}
hdr, msg, err := c.readMessage()
if err != nil {
return err
}
switch msg := msg.(type) {
case ClusterConfigMessage:
if state != stateInitial {
return fmt.Errorf("protocol error: cluster config message in state %d", state)
}
go c.receiver.ClusterConfig(c.id, msg)
state = stateReady
case IndexMessage:
switch hdr.msgType {
case messageTypeIndex:
if state != stateReady {
return fmt.Errorf("protocol error: index message in state %d", state)
}
c.handleIndex(msg)
state = stateReady
case messageTypeIndexUpdate:
if state != stateReady {
return fmt.Errorf("protocol error: index update message in state %d", state)
}
c.handleIndexUpdate(msg)
state = stateReady
}
case RequestMessage:
if state != stateReady {
return fmt.Errorf("protocol error: request message in state %d", state)
}
// Requests are handled asynchronously
go c.handleRequest(hdr.msgID, msg)
case ResponseMessage:
if state != stateReady {
return fmt.Errorf("protocol error: response message in state %d", state)
}
c.handleResponse(hdr.msgID, msg)
case pingMessage:
if state != stateReady {
return fmt.Errorf("protocol error: ping message in state %d", state)
}
// Nothing
case CloseMessage:
return errors.New(msg.Reason)
default:
return fmt.Errorf("protocol error: %s: unknown message type %#x", c.id, hdr.msgType)
}
}
}
func (c *rawConnection) readMessage() (hdr header, msg encodable, err error) {
if cap(c.rdbuf0) < 8 {
c.rdbuf0 = make([]byte, 8)
} else {
c.rdbuf0 = c.rdbuf0[:8]
}
_, err = io.ReadFull(c.cr, c.rdbuf0)
if err != nil {
return
}
hdr = decodeHeader(binary.BigEndian.Uint32(c.rdbuf0[0:4]))
msglen := int(binary.BigEndian.Uint32(c.rdbuf0[4:8]))
if debug {
l.Debugf("read header %v (msglen=%d)", hdr, msglen)
}
if msglen > MaxMessageLen {
err = fmt.Errorf("message length %d exceeds maximum %d", msglen, MaxMessageLen)
return
}
if hdr.version != 0 {
err = fmt.Errorf("unknown protocol version 0x%x", hdr.version)
return
}
if cap(c.rdbuf0) < msglen {
c.rdbuf0 = make([]byte, msglen)
} else {
c.rdbuf0 = c.rdbuf0[:msglen]
}
_, err = io.ReadFull(c.cr, c.rdbuf0)
if err != nil {
return
}
if debug {
l.Debugf("read %d bytes", len(c.rdbuf0))
}
msgBuf := c.rdbuf0
if hdr.compression && msglen > 0 {
c.rdbuf1 = c.rdbuf1[:cap(c.rdbuf1)]
c.rdbuf1, err = lz4.Decode(c.rdbuf1, c.rdbuf0)
if err != nil {
return
}
msgBuf = c.rdbuf1
if debug {
l.Debugf("decompressed to %d bytes", len(msgBuf))
}
}
if debug {
if len(msgBuf) > 1024 {
l.Debugf("message data:\n%s", hex.Dump(msgBuf[:1024]))
} else {
l.Debugf("message data:\n%s", hex.Dump(msgBuf))
}
}
// We check each returned error for the XDRError.IsEOF() method.
// IsEOF()==true here means that the message contained fewer fields than
// expected. It does not signify an EOF on the socket, because we've
// successfully read a size value and that many bytes already. New fields
// we expected but the other peer didn't send should be interpreted as
// zero/nil, and if that's not valid we'll verify it somewhere else.
switch hdr.msgType {
case messageTypeIndex, messageTypeIndexUpdate:
var idx IndexMessage
err = idx.UnmarshalXDR(msgBuf)
if xdrErr, ok := err.(isEofer); ok && xdrErr.IsEOF() {
err = nil
}
msg = idx
case messageTypeRequest:
var req RequestMessage
err = req.UnmarshalXDR(msgBuf)
if xdrErr, ok := err.(isEofer); ok && xdrErr.IsEOF() {
err = nil
}
msg = req
case messageTypeResponse:
var resp ResponseMessage
err = resp.UnmarshalXDR(msgBuf)
if xdrErr, ok := err.(isEofer); ok && xdrErr.IsEOF() {
err = nil
}
msg = resp
case messageTypePing:
msg = pingMessage{}
case messageTypeClusterConfig:
var cc ClusterConfigMessage
err = cc.UnmarshalXDR(msgBuf)
if xdrErr, ok := err.(isEofer); ok && xdrErr.IsEOF() {
err = nil
}
msg = cc
case messageTypeClose:
var cm CloseMessage
err = cm.UnmarshalXDR(msgBuf)
if xdrErr, ok := err.(isEofer); ok && xdrErr.IsEOF() {
err = nil
}
msg = cm
default:
err = fmt.Errorf("protocol error: %s: unknown message type %#x", c.id, hdr.msgType)
}
return
}
func (c *rawConnection) handleIndex(im IndexMessage) {
if debug {
l.Debugf("Index(%v, %v, %d file, flags %x, opts: %s)", c.id, im.Folder, len(im.Files), im.Flags, im.Options)
}
c.receiver.Index(c.id, im.Folder, filterIndexMessageFiles(im.Files), im.Flags, im.Options)
}
func (c *rawConnection) handleIndexUpdate(im IndexMessage) {
if debug {
l.Debugf("queueing IndexUpdate(%v, %v, %d files, flags %x, opts: %s)", c.id, im.Folder, len(im.Files), im.Flags, im.Options)
}
c.receiver.IndexUpdate(c.id, im.Folder, filterIndexMessageFiles(im.Files), im.Flags, im.Options)
}
func filterIndexMessageFiles(fs []FileInfo) []FileInfo {
var out []FileInfo
for i, f := range fs {
switch f.Name {
case "", ".", "..", "/": // A few obviously invalid filenames
l.Infof("Dropping invalid filename %q from incoming index", f.Name)
if out == nil {
// Most incoming updates won't contain anything invalid, so we
// delay the allocation and copy to output slice until we
// really need to do it, then copy all the so var valid files
// to it.
out = make([]FileInfo, i, len(fs)-1)
copy(out, fs)
}
default:
if out != nil {
out = append(out, f)
}
}
}
if out != nil {
return out
}
return fs
}
func (c *rawConnection) handleRequest(msgID int, req RequestMessage) {
size := int(req.Size)
usePool := size <= BlockSize
var buf []byte
var done chan struct{}
if usePool {
buf = c.pool.Get().([]byte)[:size]
done = make(chan struct{})
} else {
buf = make([]byte, size)
}
err := c.receiver.Request(c.id, req.Folder, req.Name, int64(req.Offset), req.Hash, req.Flags, req.Options, buf)
if err != nil {
c.send(msgID, messageTypeResponse, ResponseMessage{
Data: nil,
Code: errorToCode(err),
}, done)
} else {
c.send(msgID, messageTypeResponse, ResponseMessage{
Data: buf,
Code: errorToCode(err),
}, done)
}
if usePool {
<-done
c.pool.Put(buf)
}
}
func (c *rawConnection) handleResponse(msgID int, resp ResponseMessage) {
c.awaitingMut.Lock()
if rc := c.awaiting[msgID]; rc != nil {
c.awaiting[msgID] = nil
rc <- asyncResult{resp.Data, codeToError(resp.Code)}
close(rc)
}
c.awaitingMut.Unlock()
}
func (c *rawConnection) handlePong(msgID int) {
c.awaitingMut.Lock()
if rc := c.awaiting[msgID]; rc != nil {
c.awaiting[msgID] = nil
rc <- asyncResult{}
close(rc)
}
c.awaitingMut.Unlock()
}
func (c *rawConnection) send(msgID int, msgType int, msg encodable, done chan struct{}) bool {
if msgID < 0 {
select {
case id := <-c.nextID:
msgID = id
case <-c.closed:
return false
}
}
hdr := header{
version: 0,
msgID: msgID,
msgType: msgType,
}
select {
case c.outbox <- hdrMsg{hdr, msg, done}:
return true
case <-c.closed:
return false
}
}
func (c *rawConnection) writerLoop() {
var msgBuf = make([]byte, 8) // buffer for wire format message, kept and reused
var uncBuf []byte // buffer for uncompressed message, kept and reused
for {
var tempBuf []byte
var err error
select {
case hm := <-c.outbox:
if hm.msg != nil {
// Uncompressed message in uncBuf
uncBuf, err = hm.msg.AppendXDR(uncBuf[:0])
if hm.done != nil {
close(hm.done)
}
if err != nil {
c.close(err)
return
}
compress := false
switch c.compression {
case CompressAlways:
compress = true
case CompressMetadata:
compress = hm.hdr.msgType != messageTypeResponse
}
if compress && len(uncBuf) >= compressionThreshold {
// Use compression for large messages
hm.hdr.compression = true
// Make sure we have enough space for the compressed message plus header in msgBug
msgBuf = msgBuf[:cap(msgBuf)]
if maxLen := lz4.CompressBound(len(uncBuf)) + 8; maxLen > len(msgBuf) {
msgBuf = make([]byte, maxLen)
}
// Compressed is written to msgBuf, we keep tb for the length only
tempBuf, err = lz4.Encode(msgBuf[8:], uncBuf)
binary.BigEndian.PutUint32(msgBuf[4:8], uint32(len(tempBuf)))
msgBuf = msgBuf[0 : len(tempBuf)+8]
if debug {
l.Debugf("write compressed message; %v (len=%d)", hm.hdr, len(tempBuf))
}
} else {
// No point in compressing very short messages
hm.hdr.compression = false
msgBuf = msgBuf[:cap(msgBuf)]
if l := len(uncBuf) + 8; l > len(msgBuf) {
msgBuf = make([]byte, l)
}
binary.BigEndian.PutUint32(msgBuf[4:8], uint32(len(uncBuf)))
msgBuf = msgBuf[0 : len(uncBuf)+8]
copy(msgBuf[8:], uncBuf)
if debug {
l.Debugf("write uncompressed message; %v (len=%d)", hm.hdr, len(uncBuf))
}
}
} else {
if debug {
l.Debugf("write empty message; %v", hm.hdr)
}
binary.BigEndian.PutUint32(msgBuf[4:8], 0)
msgBuf = msgBuf[:8]
}
binary.BigEndian.PutUint32(msgBuf[0:4], encodeHeader(hm.hdr))
if err == nil {
var n int
n, err = c.cw.Write(msgBuf)
if debug {
l.Debugf("wrote %d bytes on the wire", n)
}
}
if err != nil {
c.close(err)
return
}
case <-c.closed:
return
}
}
}
func (c *rawConnection) close(err error) {
c.once.Do(func() {
close(c.closed)
c.awaitingMut.Lock()
for i, ch := range c.awaiting {
if ch != nil {
close(ch)
c.awaiting[i] = nil
}
}
c.awaitingMut.Unlock()
go c.receiver.Close(c.id, err)
})
}
func (c *rawConnection) idGenerator() {
nextID := 0
for {
nextID = (nextID + 1) & 0xfff
select {
case c.nextID <- nextID:
case <-c.closed:
return
}
}
}
// The pingSender makes sure that we've sent a message within the last
// PingSendInterval. If we already have something sent in the last
// PingSendInterval/2, we do nothing. Otherwise we send a ping message. This
// results in an effecting ping interval of somewhere between
// PingSendInterval/2 and PingSendInterval.
func (c *rawConnection) pingSender() {
ticker := time.Tick(PingSendInterval / 2)
for {
select {
case <-ticker:
d := time.Since(c.cw.Last())
if d < PingSendInterval/2 {
if debug {
l.Debugln(c.id, "ping skipped after wr", d)
}
continue
}
if debug {
l.Debugln(c.id, "ping -> after", d)
}
c.ping()
case <-c.closed:
return
}
}
}
// The pingReciever checks that we've received a message (any message will do,
// but we expect pings in the absence of other messages) within the last
// ReceiveTimeout. If not, we close the connection with an ErrTimeout.
func (c *rawConnection) pingReceiver() {
ticker := time.Tick(ReceiveTimeout / 2)
for {
select {
case <-ticker:
d := time.Since(c.cr.Last())
if d > ReceiveTimeout {
if debug {
l.Debugln(c.id, "ping timeout", d)
}
c.close(ErrTimeout)
}
if debug {
l.Debugln(c.id, "last read within", d)
}
case <-c.closed:
return
}
}
}
type Statistics struct {
At time.Time
InBytesTotal int64
OutBytesTotal int64
}
func (c *rawConnection) Statistics() Statistics {
return Statistics{
At: time.Now(),
InBytesTotal: c.cr.Tot(),
OutBytesTotal: c.cw.Tot(),
}
}

316
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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"reflect"
"strings"
"testing"
"testing/quick"
"github.com/calmh/xdr"
)
var (
c0ID = NewDeviceID([]byte{1})
c1ID = NewDeviceID([]byte{2})
)
func TestHeaderFunctions(t *testing.T) {
f := func(ver, id, typ int) bool {
ver = int(uint(ver) % 16)
id = int(uint(id) % 4096)
typ = int(uint(typ) % 256)
h0 := header{version: ver, msgID: id, msgType: typ}
h1 := decodeHeader(encodeHeader(h0))
return h0 == h1
}
if err := quick.Check(f, nil); err != nil {
t.Error(err)
}
}
func TestHeaderLayout(t *testing.T) {
var e, a uint32
// Version are the first four bits
e = 0xf0000000
a = encodeHeader(header{version: 0xf})
if a != e {
t.Errorf("Header layout incorrect; %08x != %08x", a, e)
}
// Message ID are the following 12 bits
e = 0x0fff0000
a = encodeHeader(header{msgID: 0xfff})
if a != e {
t.Errorf("Header layout incorrect; %08x != %08x", a, e)
}
// Type are the last 8 bits before reserved
e = 0x0000ff00
a = encodeHeader(header{msgType: 0xff})
if a != e {
t.Errorf("Header layout incorrect; %08x != %08x", a, e)
}
}
func TestPing(t *testing.T) {
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection(c0ID, ar, bw, newTestModel(), "name", CompressAlways).(wireFormatConnection).next.(*rawConnection)
c0.Start()
c1 := NewConnection(c1ID, br, aw, newTestModel(), "name", CompressAlways).(wireFormatConnection).next.(*rawConnection)
c1.Start()
c0.ClusterConfig(ClusterConfigMessage{})
c1.ClusterConfig(ClusterConfigMessage{})
if ok := c0.ping(); !ok {
t.Error("c0 ping failed")
}
if ok := c1.ping(); !ok {
t.Error("c1 ping failed")
}
}
func TestVersionErr(t *testing.T) {
m0 := newTestModel()
m1 := newTestModel()
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection(c0ID, ar, bw, m0, "name", CompressAlways).(wireFormatConnection).next.(*rawConnection)
c0.Start()
c1 := NewConnection(c1ID, br, aw, m1, "name", CompressAlways)
c1.Start()
c0.ClusterConfig(ClusterConfigMessage{})
c1.ClusterConfig(ClusterConfigMessage{})
w := xdr.NewWriter(c0.cw)
w.WriteUint32(encodeHeader(header{
version: 2,
msgID: 0,
msgType: 0,
}))
w.WriteUint32(0) // Avoids reader closing due to EOF
if !m1.isClosed() {
t.Error("Connection should close due to unknown version")
}
}
func TestTypeErr(t *testing.T) {
m0 := newTestModel()
m1 := newTestModel()
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection(c0ID, ar, bw, m0, "name", CompressAlways).(wireFormatConnection).next.(*rawConnection)
c0.Start()
c1 := NewConnection(c1ID, br, aw, m1, "name", CompressAlways)
c1.Start()
c0.ClusterConfig(ClusterConfigMessage{})
c1.ClusterConfig(ClusterConfigMessage{})
w := xdr.NewWriter(c0.cw)
w.WriteUint32(encodeHeader(header{
version: 0,
msgID: 0,
msgType: 42,
}))
w.WriteUint32(0) // Avoids reader closing due to EOF
if !m1.isClosed() {
t.Error("Connection should close due to unknown message type")
}
}
func TestClose(t *testing.T) {
m0 := newTestModel()
m1 := newTestModel()
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection(c0ID, ar, bw, m0, "name", CompressAlways).(wireFormatConnection).next.(*rawConnection)
c0.Start()
c1 := NewConnection(c1ID, br, aw, m1, "name", CompressAlways)
c1.Start()
c0.ClusterConfig(ClusterConfigMessage{})
c1.ClusterConfig(ClusterConfigMessage{})
c0.close(nil)
<-c0.closed
if !m0.isClosed() {
t.Fatal("Connection should be closed")
}
// None of these should panic, some should return an error
if c0.ping() {
t.Error("Ping should not return true")
}
c0.Index("default", nil, 0, nil)
c0.Index("default", nil, 0, nil)
if _, err := c0.Request("default", "foo", 0, 0, nil, 0, nil); err == nil {
t.Error("Request should return an error")
}
}
func TestElementSizeExceededNested(t *testing.T) {
m := ClusterConfigMessage{
Folders: []Folder{
{ID: "longstringlongstringlongstringinglongstringlongstringlonlongstringlongstringlon"},
},
}
_, err := m.EncodeXDR(ioutil.Discard)
if err == nil {
t.Errorf("ID length %d > max 64, but no error", len(m.Folders[0].ID))
}
}
func TestMarshalIndexMessage(t *testing.T) {
var quickCfg = &quick.Config{MaxCountScale: 10}
if testing.Short() {
quickCfg = nil
}
f := func(m1 IndexMessage) bool {
for i, f := range m1.Files {
m1.Files[i].CachedSize = 0
for j := range f.Blocks {
f.Blocks[j].Offset = 0
if len(f.Blocks[j].Hash) == 0 {
f.Blocks[j].Hash = nil
}
}
}
return testMarshal(t, "index", &m1, &IndexMessage{})
}
if err := quick.Check(f, quickCfg); err != nil {
t.Error(err)
}
}
func TestMarshalRequestMessage(t *testing.T) {
var quickCfg = &quick.Config{MaxCountScale: 10}
if testing.Short() {
quickCfg = nil
}
f := func(m1 RequestMessage) bool {
return testMarshal(t, "request", &m1, &RequestMessage{})
}
if err := quick.Check(f, quickCfg); err != nil {
t.Error(err)
}
}
func TestMarshalResponseMessage(t *testing.T) {
var quickCfg = &quick.Config{MaxCountScale: 10}
if testing.Short() {
quickCfg = nil
}
f := func(m1 ResponseMessage) bool {
if len(m1.Data) == 0 {
m1.Data = nil
}
return testMarshal(t, "response", &m1, &ResponseMessage{})
}
if err := quick.Check(f, quickCfg); err != nil {
t.Error(err)
}
}
func TestMarshalClusterConfigMessage(t *testing.T) {
var quickCfg = &quick.Config{MaxCountScale: 10}
if testing.Short() {
quickCfg = nil
}
f := func(m1 ClusterConfigMessage) bool {
return testMarshal(t, "clusterconfig", &m1, &ClusterConfigMessage{})
}
if err := quick.Check(f, quickCfg); err != nil {
t.Error(err)
}
}
func TestMarshalCloseMessage(t *testing.T) {
var quickCfg = &quick.Config{MaxCountScale: 10}
if testing.Short() {
quickCfg = nil
}
f := func(m1 CloseMessage) bool {
return testMarshal(t, "close", &m1, &CloseMessage{})
}
if err := quick.Check(f, quickCfg); err != nil {
t.Error(err)
}
}
type message interface {
EncodeXDR(io.Writer) (int, error)
DecodeXDR(io.Reader) error
}
func testMarshal(t *testing.T, prefix string, m1, m2 message) bool {
var buf bytes.Buffer
failed := func(bc []byte) {
bs, _ := json.MarshalIndent(m1, "", " ")
ioutil.WriteFile(prefix+"-1.txt", bs, 0644)
bs, _ = json.MarshalIndent(m2, "", " ")
ioutil.WriteFile(prefix+"-2.txt", bs, 0644)
if len(bc) > 0 {
f, _ := os.Create(prefix + "-data.txt")
fmt.Fprint(f, hex.Dump(bc))
f.Close()
}
}
_, err := m1.EncodeXDR(&buf)
if err != nil && strings.Contains(err.Error(), "exceeds size") {
return true
}
if err != nil {
failed(nil)
t.Fatal(err)
}
bc := make([]byte, len(buf.Bytes()))
copy(bc, buf.Bytes())
err = m2.DecodeXDR(&buf)
if err != nil {
failed(bc)
t.Fatal(err)
}
ok := reflect.DeepEqual(m1, m2)
if !ok {
failed(bc)
}
return ok
}

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// Copyright (C) 2015 The Protocol Authors.
package protocol
// The Vector type represents a version vector. The zero value is a usable
// version vector. The vector has slice semantics and some operations on it
// are "append-like" in that they may return the same vector modified, or a
// new allocated Vector with the modified contents.
type Vector []Counter
// Counter represents a single counter in the version vector.
type Counter struct {
ID uint64
Value uint64
}
// Update returns a Vector with the index for the specific ID incremented by
// one. If it is possible, the vector v is updated and returned. If it is not,
// a copy will be created, updated and returned.
func (v Vector) Update(ID uint64) Vector {
for i := range v {
if v[i].ID == ID {
// Update an existing index
v[i].Value++
return v
} else if v[i].ID > ID {
// Insert a new index
nv := make(Vector, len(v)+1)
copy(nv, v[:i])
nv[i].ID = ID
nv[i].Value = 1
copy(nv[i+1:], v[i:])
return nv
}
}
// Append a new new index
return append(v, Counter{ID, 1})
}
// Merge returns the vector containing the maximum indexes from a and b. If it
// is possible, the vector a is updated and returned. If it is not, a copy
// will be created, updated and returned.
func (a Vector) Merge(b Vector) Vector {
var ai, bi int
for bi < len(b) {
if ai == len(a) {
// We've reach the end of a, all that remains are appends
return append(a, b[bi:]...)
}
if a[ai].ID > b[bi].ID {
// The index from b should be inserted here
n := make(Vector, len(a)+1)
copy(n, a[:ai])
n[ai] = b[bi]
copy(n[ai+1:], a[ai:])
a = n
}
if a[ai].ID == b[bi].ID {
if v := b[bi].Value; v > a[ai].Value {
a[ai].Value = v
}
}
if bi < len(b) && a[ai].ID == b[bi].ID {
bi++
}
ai++
}
return a
}
// Copy returns an identical vector that is not shared with v.
func (v Vector) Copy() Vector {
nv := make(Vector, len(v))
copy(nv, v)
return nv
}
// Equal returns true when the two vectors are equivalent.
func (a Vector) Equal(b Vector) bool {
return a.Compare(b) == Equal
}
// LesserEqual returns true when the two vectors are equivalent or a is Lesser
// than b.
func (a Vector) LesserEqual(b Vector) bool {
comp := a.Compare(b)
return comp == Lesser || comp == Equal
}
// LesserEqual returns true when the two vectors are equivalent or a is Greater
// than b.
func (a Vector) GreaterEqual(b Vector) bool {
comp := a.Compare(b)
return comp == Greater || comp == Equal
}
// Concurrent returns true when the two vectors are concrurrent.
func (a Vector) Concurrent(b Vector) bool {
comp := a.Compare(b)
return comp == ConcurrentGreater || comp == ConcurrentLesser
}
// Counter returns the current value of the given counter ID.
func (v Vector) Counter(id uint64) uint64 {
for _, c := range v {
if c.ID == id {
return c.Value
}
}
return 0
}

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// Copyright (C) 2015 The Protocol Authors.
package protocol
// Ordering represents the relationship between two Vectors.
type Ordering int
const (
Equal Ordering = iota
Greater
Lesser
ConcurrentLesser
ConcurrentGreater
)
// There's really no such thing as "concurrent lesser" and "concurrent
// greater" in version vectors, just "concurrent". But it's useful to be able
// to get a strict ordering between versions for stable sorts and so on, so we
// return both variants. The convenience method Concurrent() can be used to
// check for either case.
// Compare returns the Ordering that describes a's relation to b.
func (a Vector) Compare(b Vector) Ordering {
var ai, bi int // index into a and b
var av, bv Counter // value at current index
result := Equal
for ai < len(a) || bi < len(b) {
var aMissing, bMissing bool
if ai < len(a) {
av = a[ai]
} else {
av = Counter{}
aMissing = true
}
if bi < len(b) {
bv = b[bi]
} else {
bv = Counter{}
bMissing = true
}
switch {
case av.ID == bv.ID:
// We have a counter value for each side
if av.Value > bv.Value {
if result == Lesser {
return ConcurrentLesser
}
result = Greater
} else if av.Value < bv.Value {
if result == Greater {
return ConcurrentGreater
}
result = Lesser
}
case !aMissing && av.ID < bv.ID || bMissing:
// Value is missing on the b side
if av.Value > 0 {
if result == Lesser {
return ConcurrentLesser
}
result = Greater
}
case !bMissing && bv.ID < av.ID || aMissing:
// Value is missing on the a side
if bv.Value > 0 {
if result == Greater {
return ConcurrentGreater
}
result = Lesser
}
}
if ai < len(a) && (av.ID <= bv.ID || bMissing) {
ai++
}
if bi < len(b) && (bv.ID <= av.ID || aMissing) {
bi++
}
}
return result
}

249
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// Copyright (C) 2015 The Protocol Authors.
package protocol
import (
"math"
"testing"
)
func TestCompare(t *testing.T) {
testcases := []struct {
a, b Vector
r Ordering
}{
// Empty vectors are identical
{Vector{}, Vector{}, Equal},
{Vector{}, nil, Equal},
{nil, Vector{}, Equal},
{nil, Vector{Counter{42, 0}}, Equal},
{Vector{}, Vector{Counter{42, 0}}, Equal},
{Vector{Counter{42, 0}}, nil, Equal},
{Vector{Counter{42, 0}}, Vector{}, Equal},
// Zero is the implied value for a missing Counter
{
Vector{Counter{42, 0}},
Vector{Counter{77, 0}},
Equal,
},
// Equal vectors are equal
{
Vector{Counter{42, 33}},
Vector{Counter{42, 33}},
Equal,
},
{
Vector{Counter{42, 33}, Counter{77, 24}},
Vector{Counter{42, 33}, Counter{77, 24}},
Equal,
},
// These a-vectors are all greater than the b-vector
{
Vector{Counter{42, 1}},
nil,
Greater,
},
{
Vector{Counter{42, 1}},
Vector{},
Greater,
},
{
Vector{Counter{0, 1}},
Vector{Counter{0, 0}},
Greater,
},
{
Vector{Counter{42, 1}},
Vector{Counter{42, 0}},
Greater,
},
{
Vector{Counter{math.MaxUint64, 1}},
Vector{Counter{math.MaxUint64, 0}},
Greater,
},
{
Vector{Counter{0, math.MaxUint64}},
Vector{Counter{0, 0}},
Greater,
},
{
Vector{Counter{42, math.MaxUint64}},
Vector{Counter{42, 0}},
Greater,
},
{
Vector{Counter{math.MaxUint64, math.MaxUint64}},
Vector{Counter{math.MaxUint64, 0}},
Greater,
},
{
Vector{Counter{0, math.MaxUint64}},
Vector{Counter{0, math.MaxUint64 - 1}},
Greater,
},
{
Vector{Counter{42, math.MaxUint64}},
Vector{Counter{42, math.MaxUint64 - 1}},
Greater,
},
{
Vector{Counter{math.MaxUint64, math.MaxUint64}},
Vector{Counter{math.MaxUint64, math.MaxUint64 - 1}},
Greater,
},
{
Vector{Counter{42, 2}},
Vector{Counter{42, 1}},
Greater,
},
{
Vector{Counter{22, 22}, Counter{42, 2}},
Vector{Counter{22, 22}, Counter{42, 1}},
Greater,
},
{
Vector{Counter{42, 2}, Counter{77, 3}},
Vector{Counter{42, 1}, Counter{77, 3}},
Greater,
},
{
Vector{Counter{22, 22}, Counter{42, 2}, Counter{77, 3}},
Vector{Counter{22, 22}, Counter{42, 1}, Counter{77, 3}},
Greater,
},
{
Vector{Counter{22, 23}, Counter{42, 2}, Counter{77, 4}},
Vector{Counter{22, 22}, Counter{42, 1}, Counter{77, 3}},
Greater,
},
// These a-vectors are all lesser than the b-vector
{nil, Vector{Counter{42, 1}}, Lesser},
{Vector{}, Vector{Counter{42, 1}}, Lesser},
{
Vector{Counter{42, 0}},
Vector{Counter{42, 1}},
Lesser,
},
{
Vector{Counter{42, 1}},
Vector{Counter{42, 2}},
Lesser,
},
{
Vector{Counter{22, 22}, Counter{42, 1}},
Vector{Counter{22, 22}, Counter{42, 2}},
Lesser,
},
{
Vector{Counter{42, 1}, Counter{77, 3}},
Vector{Counter{42, 2}, Counter{77, 3}},
Lesser,
},
{
Vector{Counter{22, 22}, Counter{42, 1}, Counter{77, 3}},
Vector{Counter{22, 22}, Counter{42, 2}, Counter{77, 3}},
Lesser,
},
{
Vector{Counter{22, 22}, Counter{42, 1}, Counter{77, 3}},
Vector{Counter{22, 23}, Counter{42, 2}, Counter{77, 4}},
Lesser,
},
// These are all in conflict
{
Vector{Counter{42, 2}},
Vector{Counter{43, 1}},
ConcurrentGreater,
},
{
Vector{Counter{43, 1}},
Vector{Counter{42, 2}},
ConcurrentLesser,
},
{
Vector{Counter{22, 23}, Counter{42, 1}},
Vector{Counter{22, 22}, Counter{42, 2}},
ConcurrentGreater,
},
{
Vector{Counter{22, 21}, Counter{42, 2}},
Vector{Counter{22, 22}, Counter{42, 1}},
ConcurrentLesser,
},
{
Vector{Counter{22, 21}, Counter{42, 2}, Counter{43, 1}},
Vector{Counter{20, 1}, Counter{22, 22}, Counter{42, 1}},
ConcurrentLesser,
},
}
for i, tc := range testcases {
// Test real Compare
if r := tc.a.Compare(tc.b); r != tc.r {
t.Errorf("%d: %+v.Compare(%+v) == %v (expected %v)", i, tc.a, tc.b, r, tc.r)
}
// Test convenience functions
switch tc.r {
case Greater:
if tc.a.Equal(tc.b) {
t.Errorf("%+v == %+v", tc.a, tc.b)
}
if tc.a.Concurrent(tc.b) {
t.Errorf("%+v concurrent %+v", tc.a, tc.b)
}
if !tc.a.GreaterEqual(tc.b) {
t.Errorf("%+v not >= %+v", tc.a, tc.b)
}
if tc.a.LesserEqual(tc.b) {
t.Errorf("%+v <= %+v", tc.a, tc.b)
}
case Lesser:
if tc.a.Concurrent(tc.b) {
t.Errorf("%+v concurrent %+v", tc.a, tc.b)
}
if tc.a.Equal(tc.b) {
t.Errorf("%+v == %+v", tc.a, tc.b)
}
if tc.a.GreaterEqual(tc.b) {
t.Errorf("%+v >= %+v", tc.a, tc.b)
}
if !tc.a.LesserEqual(tc.b) {
t.Errorf("%+v not <= %+v", tc.a, tc.b)
}
case Equal:
if tc.a.Concurrent(tc.b) {
t.Errorf("%+v concurrent %+v", tc.a, tc.b)
}
if !tc.a.Equal(tc.b) {
t.Errorf("%+v not == %+v", tc.a, tc.b)
}
if !tc.a.GreaterEqual(tc.b) {
t.Errorf("%+v not <= %+v", tc.a, tc.b)
}
if !tc.a.LesserEqual(tc.b) {
t.Errorf("%+v not <= %+v", tc.a, tc.b)
}
case ConcurrentLesser, ConcurrentGreater:
if !tc.a.Concurrent(tc.b) {
t.Errorf("%+v not concurrent %+v", tc.a, tc.b)
}
if tc.a.Equal(tc.b) {
t.Errorf("%+v == %+v", tc.a, tc.b)
}
if tc.a.GreaterEqual(tc.b) {
t.Errorf("%+v >= %+v", tc.a, tc.b)
}
if tc.a.LesserEqual(tc.b) {
t.Errorf("%+v <= %+v", tc.a, tc.b)
}
}
}
}

134
lib/protocol/vector_test.go Normal file
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// Copyright (C) 2015 The Protocol Authors.
package protocol
import "testing"
func TestUpdate(t *testing.T) {
var v Vector
// Append
v = v.Update(42)
expected := Vector{Counter{42, 1}}
if v.Compare(expected) != Equal {
t.Errorf("Update error, %+v != %+v", v, expected)
}
// Insert at front
v = v.Update(36)
expected = Vector{Counter{36, 1}, Counter{42, 1}}
if v.Compare(expected) != Equal {
t.Errorf("Update error, %+v != %+v", v, expected)
}
// Insert in moddle
v = v.Update(37)
expected = Vector{Counter{36, 1}, Counter{37, 1}, Counter{42, 1}}
if v.Compare(expected) != Equal {
t.Errorf("Update error, %+v != %+v", v, expected)
}
// Update existing
v = v.Update(37)
expected = Vector{Counter{36, 1}, Counter{37, 2}, Counter{42, 1}}
if v.Compare(expected) != Equal {
t.Errorf("Update error, %+v != %+v", v, expected)
}
}
func TestCopy(t *testing.T) {
v0 := Vector{Counter{42, 1}}
v1 := v0.Copy()
v1.Update(42)
if v0.Compare(v1) != Lesser {
t.Errorf("Copy error, %+v should be ancestor of %+v", v0, v1)
}
}
func TestMerge(t *testing.T) {
testcases := []struct {
a, b, m Vector
}{
// No-ops
{
Vector{},
Vector{},
Vector{},
},
{
Vector{Counter{22, 1}, Counter{42, 1}},
Vector{Counter{22, 1}, Counter{42, 1}},
Vector{Counter{22, 1}, Counter{42, 1}},
},
// Appends
{
Vector{},
Vector{Counter{22, 1}, Counter{42, 1}},
Vector{Counter{22, 1}, Counter{42, 1}},
},
{
Vector{Counter{22, 1}},
Vector{Counter{42, 1}},
Vector{Counter{22, 1}, Counter{42, 1}},
},
{
Vector{Counter{22, 1}},
Vector{Counter{22, 1}, Counter{42, 1}},
Vector{Counter{22, 1}, Counter{42, 1}},
},
// Insert
{
Vector{Counter{22, 1}, Counter{42, 1}},
Vector{Counter{22, 1}, Counter{23, 2}, Counter{42, 1}},
Vector{Counter{22, 1}, Counter{23, 2}, Counter{42, 1}},
},
{
Vector{Counter{42, 1}},
Vector{Counter{22, 1}},
Vector{Counter{22, 1}, Counter{42, 1}},
},
// Update
{
Vector{Counter{22, 1}, Counter{42, 2}},
Vector{Counter{22, 2}, Counter{42, 1}},
Vector{Counter{22, 2}, Counter{42, 2}},
},
// All of the above
{
Vector{Counter{10, 1}, Counter{20, 2}, Counter{30, 1}},
Vector{Counter{5, 1}, Counter{10, 2}, Counter{15, 1}, Counter{20, 1}, Counter{25, 1}, Counter{35, 1}},
Vector{Counter{5, 1}, Counter{10, 2}, Counter{15, 1}, Counter{20, 2}, Counter{25, 1}, Counter{30, 1}, Counter{35, 1}},
},
}
for i, tc := range testcases {
if m := tc.a.Merge(tc.b); m.Compare(tc.m) != Equal {
t.Errorf("%d: %+v.Merge(%+v) == %+v (expected %+v)", i, tc.a, tc.b, m, tc.m)
}
}
}
func TestCounterValue(t *testing.T) {
v0 := Vector{Counter{42, 1}, Counter{64, 5}}
if v0.Counter(42) != 1 {
t.Error("Counter error, %d != %d", v0.Counter(42), 1)
}
if v0.Counter(64) != 5 {
t.Error("Counter error, %d != %d", v0.Counter(64), 5)
}
if v0.Counter(72) != 0 {
t.Error("Counter error, %d != %d", v0.Counter(72), 0)
}
}

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// Copyright (C) 2015 The Protocol Authors.
package protocol
import "github.com/calmh/xdr"
// This stuff is hacked up manually because genxdr doesn't support 'type
// Vector []Counter' declarations and it was tricky when I tried to add it...
type xdrWriter interface {
WriteUint32(uint32) (int, error)
WriteUint64(uint64) (int, error)
}
type xdrReader interface {
ReadUint32() uint32
ReadUint64() uint64
}
// EncodeXDRInto encodes the vector as an XDR object into the given XDR
// encoder.
func (v Vector) EncodeXDRInto(w xdrWriter) (int, error) {
w.WriteUint32(uint32(len(v)))
for i := range v {
w.WriteUint64(v[i].ID)
w.WriteUint64(v[i].Value)
}
return 4 + 16*len(v), nil
}
// DecodeXDRFrom decodes the XDR objects from the given reader into itself.
func (v *Vector) DecodeXDRFrom(r xdrReader) error {
l := int(r.ReadUint32())
if l > 1e6 {
return xdr.ElementSizeExceeded("number of counters", l, 1e6)
}
n := make(Vector, l)
for i := range n {
n[i].ID = r.ReadUint64()
n[i].Value = r.ReadUint64()
}
*v = n
return nil
}

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// Copyright (C) 2014 The Protocol Authors.
package protocol
import (
"path/filepath"
"golang.org/x/text/unicode/norm"
)
type wireFormatConnection struct {
next Connection
}
func (c wireFormatConnection) Start() {
c.next.Start()
}
func (c wireFormatConnection) ID() DeviceID {
return c.next.ID()
}
func (c wireFormatConnection) Name() string {
return c.next.Name()
}
func (c wireFormatConnection) Index(folder string, fs []FileInfo, flags uint32, options []Option) error {
var myFs = make([]FileInfo, len(fs))
copy(myFs, fs)
for i := range fs {
myFs[i].Name = norm.NFC.String(filepath.ToSlash(myFs[i].Name))
}
return c.next.Index(folder, myFs, flags, options)
}
func (c wireFormatConnection) IndexUpdate(folder string, fs []FileInfo, flags uint32, options []Option) error {
var myFs = make([]FileInfo, len(fs))
copy(myFs, fs)
for i := range fs {
myFs[i].Name = norm.NFC.String(filepath.ToSlash(myFs[i].Name))
}
return c.next.IndexUpdate(folder, myFs, flags, options)
}
func (c wireFormatConnection) Request(folder, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error) {
name = norm.NFC.String(filepath.ToSlash(name))
return c.next.Request(folder, name, offset, size, hash, flags, options)
}
func (c wireFormatConnection) ClusterConfig(config ClusterConfigMessage) {
c.next.ClusterConfig(config)
}
func (c wireFormatConnection) Statistics() Statistics {
return c.next.Statistics()
}