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Refactor out protocol and luhn (protocol dependency) packages

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Jakob Borg
2015-01-13 13:22:56 +01:00
parent 48382c4b59
commit eef1aebe8c
65 changed files with 841 additions and 70 deletions
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Copyright (C) 2014 Jakob Borg
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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// Copyright (C) 2014 Jakob Borg
// Package luhn generates and validates Luhn mod N check digits.
package luhn
import (
"fmt"
"strings"
)
// An alphabet is a string of N characters, representing the digits of a given
// base N.
type Alphabet string
var (
Base32 Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
)
// Generate returns a check digit for the string s, which should be composed
// of characters from the Alphabet a.
func (a Alphabet) Generate(s string) (rune, error) {
if err := a.check(); err != nil {
return 0, err
}
factor := 1
sum := 0
n := len(a)
for i := range s {
codepoint := strings.IndexByte(string(a), s[i])
if codepoint == -1 {
return 0, fmt.Errorf("Digit %q not valid in alphabet %q", s[i], a)
}
addend := factor * codepoint
if factor == 2 {
factor = 1
} else {
factor = 2
}
addend = (addend / n) + (addend % n)
sum += addend
}
remainder := sum % n
checkCodepoint := (n - remainder) % n
return rune(a[checkCodepoint]), nil
}
// Validate returns true if the last character of the string s is correct, for
// a string s composed of characters in the alphabet a.
func (a Alphabet) Validate(s string) bool {
t := s[:len(s)-1]
c, err := a.Generate(t)
if err != nil {
return false
}
return rune(s[len(s)-1]) == c
}
// check returns an error if the given alphabet does not consist of unique characters
func (a Alphabet) check() error {
cm := make(map[byte]bool, len(a))
for i := range a {
if cm[a[i]] {
return fmt.Errorf("Digit %q non-unique in alphabet %q", a[i], a)
}
cm[a[i]] = true
}
return nil
}

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Godeps/_workspace/src/github.com/calmh/luhn/luhn_test.go generated vendored Normal file
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// Copyright (C) 2014 Jakob Borg
package luhn_test
import (
"testing"
"github.com/calmh/luhn"
)
func TestGenerate(t *testing.T) {
// Base 6 Luhn
a := luhn.Alphabet("abcdef")
c, err := a.Generate("abcdef")
if err != nil {
t.Fatal(err)
}
if c != 'e' {
t.Errorf("Incorrect check digit %c != e", c)
}
// Base 10 Luhn
a = luhn.Alphabet("0123456789")
c, err = a.Generate("7992739871")
if err != nil {
t.Fatal(err)
}
if c != '3' {
t.Errorf("Incorrect check digit %c != 3", c)
}
}
func TestInvalidString(t *testing.T) {
a := luhn.Alphabet("ABC")
_, err := a.Generate("7992739871")
t.Log(err)
if err == nil {
t.Error("Unexpected nil error")
}
}
func TestBadAlphabet(t *testing.T) {
a := luhn.Alphabet("01234566789")
_, err := a.Generate("7992739871")
t.Log(err)
if err == nil {
t.Error("Unexpected nil error")
}
}
func TestValidate(t *testing.T) {
a := luhn.Alphabet("abcdef")
if !a.Validate("abcdefe") {
t.Errorf("Incorrect validation response for abcdefe")
}
if a.Validate("abcdefd") {
t.Errorf("Incorrect validation response for abcdefd")
}
}

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*.txt

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# This is the official list of 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
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- A contribution solving a single issue or introducing a single new
feature should probably be a single commit based on the current
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request to make sure this is the case, especially if there have been
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## Licensing
All contributions are made under the same GPL 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
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When accepting your first contribution, the maintainer of the project
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## Tests
Yes please!
## License
GPLv3

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agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License. You may not convey a covered
work if you are a party to an arrangement with a third party that is
in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
the work, and under which the third party grants, to any of the
parties who would receive the covered work from you, a discriminatory
patent license (a) in connection with copies of the covered work
conveyed by you (or copies made from those copies), or (b) primarily
for and in connection with specific products or compilations that
contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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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)
[![GPL License](http://img.shields.io/badge/license-GPL-blue.svg?style=flat-square)](http://opensource.org/licenses/GPL-3.0)
This is the protocol implementation used by Syncthing.
License
=======
GPLv3

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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package protocol
import (
"io"
"time"
)
type TestModel struct {
data []byte
folder string
name string
offset int64
size int
closedCh chan bool
}
func newTestModel() *TestModel {
return &TestModel{
closedCh: make(chan bool),
}
}
func (t *TestModel) Index(deviceID DeviceID, folder string, files []FileInfo) {
}
func (t *TestModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
}
func (t *TestModel) Request(deviceID DeviceID, folder, name string, offset int64, size int) ([]byte, error) {
t.folder = folder
t.name = name
t.offset = offset
t.size = size
return t.data, 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) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package protocol
import (
"io"
"sync/atomic"
"time"
)
type countingReader struct {
io.Reader
tot uint64 // bytes
last int64 // unix nanos
}
var (
totalIncoming uint64
totalOutgoing uint64
)
func (c *countingReader) Read(bs []byte) (int, error) {
n, err := c.Reader.Read(bs)
atomic.AddUint64(&c.tot, uint64(n))
atomic.AddUint64(&totalIncoming, uint64(n))
atomic.StoreInt64(&c.last, time.Now().UnixNano())
return n, err
}
func (c *countingReader) Tot() uint64 {
return atomic.LoadUint64(&c.tot)
}
func (c *countingReader) Last() time.Time {
return time.Unix(0, atomic.LoadInt64(&c.last))
}
type countingWriter struct {
io.Writer
tot uint64 // bytes
last int64 // unix nanos
}
func (c *countingWriter) Write(bs []byte) (int, error) {
n, err := c.Writer.Write(bs)
atomic.AddUint64(&c.tot, uint64(n))
atomic.AddUint64(&totalOutgoing, uint64(n))
atomic.StoreInt64(&c.last, time.Now().UnixNano())
return n, err
}
func (c *countingWriter) Tot() uint64 {
return atomic.LoadUint64(&c.tot)
}
func (c *countingWriter) Last() time.Time {
return time.Unix(0, atomic.LoadInt64(&c.last))
}
func TotalInOut() (uint64, uint64) {
return atomic.LoadUint64(&totalIncoming), atomic.LoadUint64(&totalOutgoing)
}

28
Godeps/_workspace/src/github.com/syncthing/protocol/debug.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package protocol
import (
"os"
"strings"
"github.com/calmh/logger"
)
var (
debug = strings.Contains(os.Getenv("STTRACE"), "protocol") || os.Getenv("STTRACE") == "all"
l = logger.DefaultLogger
)

170
Godeps/_workspace/src/github.com/syncthing/protocol/deviceid.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package protocol
import (
"bytes"
"crypto/sha256"
"encoding/base32"
"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
}
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
}

89
Godeps/_workspace/src/github.com/syncthing/protocol/deviceid_test.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
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")
}
}

17
Godeps/_workspace/src/github.com/syncthing/protocol/doc.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
// Package protocol implements the Block Exchange Protocol.
package protocol

56
Godeps/_workspace/src/github.com/syncthing/protocol/header.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
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,
}
}

136
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
//go:generate -command genxdr go run ../../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 // max:64
Files []FileInfo
Flags uint32
Options []Option // max:64
}
type FileInfo struct {
Name string // max:8192
Flags uint32
Modified int64
Version uint64
LocalVersion uint64
Blocks []BlockInfo
}
func (f FileInfo) String() string {
return fmt.Sprintf("File{Name:%q, Flags:0%o, Modified:%d, Version:%d, 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
}
type BlockInfo struct {
Offset int64 // noencode (cache only)
Size uint32
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 uint64
Size uint32
Hash []byte // max:64
Flags uint32
Options []Option // max:64
}
type ResponseMessage struct {
Data []byte
Error uint32
}
type ClusterConfigMessage struct {
ClientName string // max:64
ClientVersion string // max:64
Folders []Folder // max:64
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
}
type Device struct {
ID []byte // max:32
Flags uint32
MaxLocalVersion uint64
}
type Option struct {
Key string // max:64
Value string // max:1024
}
type CloseMessage struct {
Reason string // max:1024
Code uint32
}
type EmptyMessage struct{}

1036
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53
Godeps/_workspace/src/github.com/syncthing/protocol/nativemodel_darwin.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
// +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) {
for i := range files {
files[i].Name = norm.NFD.String(files[i].Name)
}
m.next.Index(deviceID, folder, files)
}
func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
for i := range files {
files[i].Name = norm.NFD.String(files[i].Name)
}
m.next.IndexUpdate(deviceID, folder, files)
}
func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, size int) ([]byte, error) {
name = norm.NFD.String(name)
return m.next.Request(deviceID, folder, name, offset, size)
}
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)
}

44
Godeps/_workspace/src/github.com/syncthing/protocol/nativemodel_unix.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
// +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) {
m.next.Index(deviceID, folder, files)
}
func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
m.next.IndexUpdate(deviceID, folder, files)
}
func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, size int) ([]byte, error) {
return m.next.Request(deviceID, folder, name, offset, size)
}
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)
}

83
Godeps/_workspace/src/github.com/syncthing/protocol/nativemodel_windows.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
// +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) {
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 contains invalid characters; marked as invalid.", f.Name)
}
files[i].Name = filepath.FromSlash(f.Name)
}
m.next.Index(deviceID, folder, files)
}
func (m nativeModel) IndexUpdate(deviceID DeviceID, 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 contains invalid characters; marked as invalid.", f.Name)
}
files[i].Name = filepath.FromSlash(files[i].Name)
}
m.next.IndexUpdate(deviceID, folder, files)
}
func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, size int) ([]byte, error) {
name = filepath.FromSlash(name)
return m.next.Request(deviceID, folder, name, offset, size)
}
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)
}

732
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package protocol
import (
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"sync"
"time"
lz4 "github.com/bkaradzic/go-lz4"
)
const (
BlockSize = 128 * 1024
)
const (
messageTypeClusterConfig = 0
messageTypeIndex = 1
messageTypeRequest = 2
messageTypeResponse = 3
messageTypePing = 4
messageTypePong = 5
messageTypeIndexUpdate = 6
messageTypeClose = 7
)
const (
stateInitial = iota
stateCCRcvd
stateIdxRcvd
)
const (
FlagDeleted uint32 = 1 << 12
FlagInvalid = 1 << 13
FlagDirectory = 1 << 14
FlagNoPermBits = 1 << 15
FlagSymlink = 1 << 16
FlagSymlinkMissingTarget = 1 << 17
SymlinkTypeMask = FlagDirectory | FlagSymlinkMissingTarget
)
const (
FlagShareTrusted uint32 = 1 << 0
FlagShareReadOnly = 1 << 1
FlagIntroducer = 1 << 2
FlagShareBits = 0x000000ff
)
var (
ErrClusterHash = fmt.Errorf("configuration error: mismatched cluster hash")
ErrClosed = errors.New("connection closed")
)
// Specific variants of empty messages...
type pingMessage struct{ EmptyMessage }
type pongMessage struct{ EmptyMessage }
type Model interface {
// An index was received from the peer device
Index(deviceID DeviceID, folder string, files []FileInfo)
// An index update was received from the peer device
IndexUpdate(deviceID DeviceID, folder string, files []FileInfo)
// A request was made by the peer device
Request(deviceID DeviceID, folder string, name string, offset int64, size int) ([]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 {
ID() DeviceID
Name() string
Index(folder string, files []FileInfo) error
IndexUpdate(folder string, files []FileInfo) error
Request(folder string, name string, offset int64, size int) ([]byte, error)
ClusterConfig(config ClusterConfigMessage)
Statistics() Statistics
}
type rawConnection struct {
id DeviceID
name string
receiver Model
state int
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
compressionThreshold int // compress messages larger than this many bytes
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
}
type encodable interface {
AppendXDR([]byte) ([]byte, error)
}
type isEofer interface {
IsEOF() bool
}
const (
pingTimeout = 30 * time.Second
pingIdleTime = 60 * time.Second
)
func NewConnection(deviceID DeviceID, reader io.Reader, writer io.Writer, receiver Model, name string, compress bool) Connection {
cr := &countingReader{Reader: reader}
cw := &countingWriter{Writer: writer}
compThres := 1<<31 - 1 // compression disabled
if compress {
compThres = 128 // compress messages that are 128 bytes long or larger
}
c := rawConnection{
id: deviceID,
name: name,
receiver: nativeModel{receiver},
state: stateInitial,
cr: cr,
cw: cw,
outbox: make(chan hdrMsg),
nextID: make(chan int),
closed: make(chan struct{}),
compressionThreshold: compThres,
}
go c.readerLoop()
go c.writerLoop()
go c.pingerLoop()
go c.idGenerator()
return wireFormatConnection{&c}
}
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) error {
select {
case <-c.closed:
return ErrClosed
default:
}
c.idxMut.Lock()
c.send(-1, messageTypeIndex, IndexMessage{
Folder: folder,
Files: idx,
})
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) error {
select {
case <-c.closed:
return ErrClosed
default:
}
c.idxMut.Lock()
c.send(-1, messageTypeIndexUpdate, IndexMessage{
Folder: folder,
Files: idx,
})
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) ([]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: uint64(offset),
Size: uint32(size),
})
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)
}
func (c *rawConnection) ping() bool {
var id int
select {
case id = <-c.nextID:
case <-c.closed:
return false
}
rc := make(chan asyncResult, 1)
c.awaitingMut.Lock()
c.awaiting[id] = rc
c.awaitingMut.Unlock()
ok := c.send(id, messageTypePing, nil)
if !ok {
return false
}
res, ok := <-rc
return ok && res.err == nil
}
func (c *rawConnection) readerLoop() (err error) {
defer func() {
c.close(err)
}()
for {
select {
case <-c.closed:
return ErrClosed
default:
}
hdr, msg, err := c.readMessage()
if err != nil {
return err
}
switch msg := msg.(type) {
case IndexMessage:
if msg.Flags != 0 {
// We don't currently support or expect any flags.
return fmt.Errorf("protocol error: unknown flags 0x%x in Index(Update) message", msg.Flags)
}
switch hdr.msgType {
case messageTypeIndex:
if c.state < stateCCRcvd {
return fmt.Errorf("protocol error: index message in state %d", c.state)
}
c.handleIndex(msg)
c.state = stateIdxRcvd
case messageTypeIndexUpdate:
if c.state < stateIdxRcvd {
return fmt.Errorf("protocol error: index update message in state %d", c.state)
}
c.handleIndexUpdate(msg)
}
case RequestMessage:
if msg.Flags != 0 {
// We don't currently support or expect any flags.
return fmt.Errorf("protocol error: unknown flags 0x%x in Request message", msg.Flags)
}
if c.state < stateIdxRcvd {
return fmt.Errorf("protocol error: request message in state %d", c.state)
}
// Requests are handled asynchronously
go c.handleRequest(hdr.msgID, msg)
case ResponseMessage:
if c.state < stateIdxRcvd {
return fmt.Errorf("protocol error: response message in state %d", c.state)
}
c.handleResponse(hdr.msgID, msg)
case pingMessage:
c.send(hdr.msgID, messageTypePong, pongMessage{})
case pongMessage:
c.handlePong(hdr.msgID)
case ClusterConfigMessage:
if c.state != stateInitial {
return fmt.Errorf("protocol error: cluster config message in state %d", c.state)
}
go c.receiver.ClusterConfig(c.id, msg)
c.state = stateCCRcvd
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 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 {
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 messageTypePong:
msg = pongMessage{}
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 files)", c.id, im.Folder, len(im.Files))
}
c.receiver.Index(c.id, im.Folder, filterIndexMessageFiles(im.Files))
}
func (c *rawConnection) handleIndexUpdate(im IndexMessage) {
if debug {
l.Debugf("queueing IndexUpdate(%v, %v, %d files)", c.id, im.Folder, len(im.Files))
}
c.receiver.IndexUpdate(c.id, im.Folder, filterIndexMessageFiles(im.Files))
}
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) {
data, _ := c.receiver.Request(c.id, req.Folder, req.Name, int64(req.Offset), int(req.Size))
c.send(msgID, messageTypeResponse, ResponseMessage{
Data: data,
})
}
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, nil}
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) 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}:
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 err != nil {
c.close(err)
return
}
if len(uncBuf) >= c.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
}
}
}
func (c *rawConnection) pingerLoop() {
var rc = make(chan bool, 1)
ticker := time.Tick(pingIdleTime / 2)
for {
select {
case <-ticker:
if d := time.Since(c.cr.Last()); d < pingIdleTime {
if debug {
l.Debugln(c.id, "ping skipped after rd", d)
}
continue
}
if d := time.Since(c.cw.Last()); d < pingIdleTime {
if debug {
l.Debugln(c.id, "ping skipped after wr", d)
}
continue
}
go func() {
if debug {
l.Debugln(c.id, "ping ->")
}
rc <- c.ping()
}()
select {
case ok := <-rc:
if debug {
l.Debugln(c.id, "<- pong")
}
if !ok {
c.close(fmt.Errorf("ping failure"))
}
case <-time.After(pingTimeout):
c.close(fmt.Errorf("ping timeout"))
case <-c.closed:
return
}
case <-c.closed:
return
}
}
}
type Statistics struct {
At time.Time
InBytesTotal uint64
OutBytesTotal uint64
}
func (c *rawConnection) Statistics() Statistics {
return Statistics{
At: time.Now(),
InBytesTotal: c.cr.Tot(),
OutBytesTotal: c.cw.Tot(),
}
}

395
Godeps/_workspace/src/github.com/syncthing/protocol/protocol_test.go generated vendored Normal file
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@@ -0,0 +1,395 @@
// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package protocol
import (
"bytes"
"encoding/hex"
"encoding/json"
"errors"
"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, nil, "name", true).(wireFormatConnection).next.(*rawConnection)
c1 := NewConnection(c1ID, br, aw, nil, "name", true).(wireFormatConnection).next.(*rawConnection)
if ok := c0.ping(); !ok {
t.Error("c0 ping failed")
}
if ok := c1.ping(); !ok {
t.Error("c1 ping failed")
}
}
func TestPingErr(t *testing.T) {
e := errors.New("something broke")
for i := 0; i < 16; i++ {
for j := 0; j < 16; j++ {
m0 := newTestModel()
m1 := newTestModel()
ar, aw := io.Pipe()
br, bw := io.Pipe()
eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
c0 := NewConnection(c0ID, ar, ebw, m0, "name", true).(wireFormatConnection).next.(*rawConnection)
NewConnection(c1ID, br, eaw, m1, "name", true)
res := c0.ping()
if (i < 8 || j < 8) && res {
t.Errorf("Unexpected ping success; i=%d, j=%d", i, j)
} else if (i >= 12 && j >= 12) && !res {
t.Errorf("Unexpected ping fail; i=%d, j=%d", i, j)
}
}
}
}
// func TestRequestResponseErr(t *testing.T) {
// e := errors.New("something broke")
// var pass bool
// for i := 0; i < 48; i++ {
// for j := 0; j < 38; j++ {
// m0 := newTestModel()
// m0.data = []byte("response data")
// m1 := newTestModel()
// ar, aw := io.Pipe()
// br, bw := io.Pipe()
// eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
// ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
// NewConnection(c0ID, ar, ebw, m0, nil)
// c1 := NewConnection(c1ID, br, eaw, m1, nil).(wireFormatConnection).next.(*rawConnection)
// d, err := c1.Request("default", "tn", 1234, 5678)
// if err == e || err == ErrClosed {
// t.Logf("Error at %d+%d bytes", i, j)
// if !m1.isClosed() {
// t.Fatal("c1 not closed")
// }
// if !m0.isClosed() {
// t.Fatal("c0 not closed")
// }
// continue
// }
// if err != nil {
// t.Fatal(err)
// }
// if string(d) != "response data" {
// t.Fatalf("Incorrect response data %q", string(d))
// }
// if m0.folder != "default" {
// t.Fatalf("Incorrect folder %q", m0.folder)
// }
// if m0.name != "tn" {
// t.Fatalf("Incorrect name %q", m0.name)
// }
// if m0.offset != 1234 {
// t.Fatalf("Incorrect offset %d", m0.offset)
// }
// if m0.size != 5678 {
// t.Fatalf("Incorrect size %d", m0.size)
// }
// t.Logf("Pass at %d+%d bytes", i, j)
// pass = true
// }
// }
// if !pass {
// t.Fatal("Never passed")
// }
// }
func TestVersionErr(t *testing.T) {
m0 := newTestModel()
m1 := newTestModel()
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection(c0ID, ar, bw, m0, "name", true).(wireFormatConnection).next.(*rawConnection)
NewConnection(c1ID, br, aw, m1, "name", true)
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", true).(wireFormatConnection).next.(*rawConnection)
NewConnection(c1ID, br, aw, m1, "name", true)
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", true).(wireFormatConnection).next.(*rawConnection)
NewConnection(c1ID, br, aw, m1, "name", true)
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)
c0.Index("default", nil)
if _, err := c0.Request("default", "foo", 0, 0); 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 _, f := range m1.Files {
for i := range f.Blocks {
f.Blocks[i].Offset = 0
if len(f.Blocks[i].Hash) == 0 {
f.Blocks[i].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
}

69
Godeps/_workspace/src/github.com/syncthing/protocol/wireformat.go generated vendored Normal file
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// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
package protocol
import (
"path/filepath"
"golang.org/x/text/unicode/norm"
)
type wireFormatConnection struct {
next Connection
}
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) 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)
}
func (c wireFormatConnection) IndexUpdate(folder string, fs []FileInfo) 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)
}
func (c wireFormatConnection) Request(folder, name string, offset int64, size int) ([]byte, error) {
name = norm.NFC.String(filepath.ToSlash(name))
return c.next.Request(folder, name, offset, size)
}
func (c wireFormatConnection) ClusterConfig(config ClusterConfigMessage) {
c.next.ClusterConfig(config)
}
func (c wireFormatConnection) Statistics() Statistics {
return c.next.Statistics()
}