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lib/upnp: Each service is it's own NAT device

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GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4625
This commit is contained in:
Audrius Butkevicius 2017-12-30 19:16:08 +00:00 committed by Jakob Borg
parent a9f0659f2f
commit c7f136c2b8
4 changed files with 59 additions and 166 deletions
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2
lib/nat/service.go
View File

@ -58,7 +58,7 @@ func (s *Service) Serve() {
if found == 1 {
suffix = ""
}
l.Infoln("Detected", found, "NAT device"+suffix)
l.Infoln("Detected", found, "NAT service"+suffix)
})
}
case <-s.stop:

117
lib/upnp/igd.go
View File

@ -1,117 +0,0 @@
// Copyright (C) 2016 The Syncthing Authors.
//
// Adapted from https://github.com/jackpal/Taipei-Torrent/blob/dd88a8bfac6431c01d959ce3c745e74b8a911793/IGD.go
// Copyright (c) 2010 Jack Palevich (https://github.com/jackpal/Taipei-Torrent/blob/dd88a8bfac6431c01d959ce3c745e74b8a911793/LICENSE)
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
package upnp
import (
"net"
"net/url"
"strings"
"time"
"github.com/syncthing/syncthing/lib/nat"
)
// An IGD is a UPnP InternetGatewayDevice.
type IGD struct {
uuid string
friendlyName string
services []IGDService
url *url.URL
localIPAddress net.IP
}
func (n *IGD) ID() string {
return n.uuid
}
func (n *IGD) FriendlyName() string {
return n.friendlyName
}
// FriendlyIdentifier returns a friendly identifier (friendly name + IP
// address) for the IGD.
func (n *IGD) FriendlyIdentifier() string {
return "'" + n.FriendlyName() + "' (" + strings.Split(n.URL().Host, ":")[0] + ")"
}
func (n *IGD) URL() *url.URL {
return n.url
}
// AddPortMapping adds a port mapping to all relevant services on the
// specified InternetGatewayDevice. Port mapping will fail and return an error
// if action is fails for _any_ of the relevant services. For this reason, it
// is generally better to configure port mapping for each individual service
// instead.
func (n *IGD) AddPortMapping(protocol nat.Protocol, internalPort, externalPort int, description string, duration time.Duration) (int, error) {
for _, service := range n.services {
err := service.AddPortMapping(n.localIPAddress, protocol, internalPort, externalPort, description, duration)
if err != nil {
return externalPort, err
}
}
return externalPort, nil
}
// DeletePortMapping deletes a port mapping from all relevant services on the
// specified InternetGatewayDevice. Port mapping will fail and return an error
// if action is fails for _any_ of the relevant services. For this reason, it
// is generally better to configure port mapping for each individual service
// instead.
func (n *IGD) DeletePortMapping(protocol nat.Protocol, externalPort int) error {
for _, service := range n.services {
err := service.DeletePortMapping(protocol, externalPort)
if err != nil {
return err
}
}
return nil
}
// GetExternalIPAddress returns the external IP address of the IGD, or an error
// if no service providing this feature exists.
func (n *IGD) GetExternalIPAddress() (ip net.IP, err error) {
for _, service := range n.services {
ip, err = service.GetExternalIPAddress()
if err == nil {
break
}
}
return
}
// GetLocalIPAddress returns the IP address of the local network interface
// which is facing the IGD.
func (n *IGD) GetLocalIPAddress() net.IP {
return n.localIPAddress
}

29
lib/upnp/igd_service.go
View File

@ -43,13 +43,16 @@ import (
// An IGDService is a specific service provided by an IGD.
type IGDService struct {
ID string
URL string
URN string
UUID string
Device upnpDevice
ServiceID string
URL string
URN string
LocalIP net.IP
}
// AddPortMapping adds a port mapping to the specified IGD service.
func (s *IGDService) AddPortMapping(localIPAddress net.IP, protocol nat.Protocol, internalPort, externalPort int, description string, duration time.Duration) error {
func (s *IGDService) AddPortMapping(protocol nat.Protocol, internalPort, externalPort int, description string, duration time.Duration) (int, error) {
tpl := `<u:AddPortMapping xmlns:u="%s">
<NewRemoteHost></NewRemoteHost>
<NewExternalPort>%d</NewExternalPort>
@ -60,21 +63,21 @@ func (s *IGDService) AddPortMapping(localIPAddress net.IP, protocol nat.Protocol
<NewPortMappingDescription>%s</NewPortMappingDescription>
<NewLeaseDuration>%d</NewLeaseDuration>
</u:AddPortMapping>`
body := fmt.Sprintf(tpl, s.URN, externalPort, protocol, internalPort, localIPAddress, description, duration/time.Second)
body := fmt.Sprintf(tpl, s.URN, externalPort, protocol, internalPort, s.LocalIP, description, duration/time.Second)
response, err := soapRequest(s.URL, s.URN, "AddPortMapping", body)
if err != nil && duration > 0 {
// Try to repair error code 725 - OnlyPermanentLeasesSupported
envelope := &soapErrorResponse{}
if unmarshalErr := xml.Unmarshal(response, envelope); unmarshalErr != nil {
return unmarshalErr
return externalPort, unmarshalErr
}
if envelope.ErrorCode == 725 {
return s.AddPortMapping(localIPAddress, protocol, internalPort, externalPort, description, 0)
return s.AddPortMapping(protocol, internalPort, externalPort, description, 0)
}
}
return err
return externalPort, err
}
// DeletePortMapping deletes a port mapping from the specified IGD service.
@ -114,3 +117,13 @@ func (s *IGDService) GetExternalIPAddress() (net.IP, error) {
return result, nil
}
// GetLocalIPAddress returns local IP address used to contact this service
func (s *IGDService) GetLocalIPAddress() net.IP {
return s.LocalIP
}
// ID returns a unique ID for the servic
func (s *IGDService) ID() string {
return s.UUID + "/" + s.Device.FriendlyName + "/" + s.ServiceID + "/" + s.URN + "/" + s.URL
}

77
lib/upnp/upnp.go
View File

@ -83,7 +83,7 @@ func Discover(renewal, timeout time.Duration) []nat.Device {
return results
}
resultChan := make(chan IGD)
resultChan := make(chan nat.Device)
wg := &sync.WaitGroup{}
@ -111,21 +111,14 @@ func Discover(renewal, timeout time.Duration) []nat.Device {
nextResult:
for result := range resultChan {
if seenResults[result.ID()] {
l.Debugf("Skipping duplicate result %s with services:", result.uuid)
for _, service := range result.services {
l.Debugf("* [%s] %s", service.ID, service.URL)
}
l.Debugf("Skipping duplicate result %s", result.ID())
continue nextResult
}
result := result // Reallocate as we need to keep a pointer
results = append(results, &result)
results = append(results, result)
seenResults[result.ID()] = true
l.Debugf("UPnP discovery result %s with services:", result.uuid)
for _, service := range result.services {
l.Debugf("* [%s] %s", service.ID, service.URL)
}
l.Debugf("UPnP discovery result %s", result.ID())
}
return results
@ -133,7 +126,7 @@ nextResult:
// Search for UPnP InternetGatewayDevices for <timeout> seconds, ignoring responses from any devices listed in knownDevices.
// The order in which the devices appear in the result list is not deterministic
func discover(intf *net.Interface, deviceType string, timeout time.Duration, results chan<- IGD) {
func discover(intf *net.Interface, deviceType string, timeout time.Duration, results chan<- nat.Device) {
ssdp := &net.UDPAddr{IP: []byte{239, 255, 255, 250}, Port: 1900}
tpl := `M-SEARCH * HTTP/1.1
@ -185,34 +178,37 @@ USER-AGENT: syncthing/1.0
}
break
}
igd, err := parseResponse(deviceType, resp[:n])
igds, err := parseResponse(deviceType, resp[:n])
if err != nil {
l.Infoln("UPnP parse:", err)
continue
}
results <- igd
for _, igd := range igds {
igd := igd // Copy before sending pointer to the channel.
results <- &igd
}
}
l.Debugln("Discovery for device type", deviceType, "on", intf.Name, "finished.")
}
func parseResponse(deviceType string, resp []byte) (IGD, error) {
func parseResponse(deviceType string, resp []byte) ([]IGDService, error) {
l.Debugln("Handling UPnP response:\n\n" + string(resp))
reader := bufio.NewReader(bytes.NewBuffer(resp))
request := &http.Request{}
response, err := http.ReadResponse(reader, request)
if err != nil {
return IGD{}, err
return nil, err
}
respondingDeviceType := response.Header.Get("St")
if respondingDeviceType != deviceType {
return IGD{}, errors.New("unrecognized UPnP device of type " + respondingDeviceType)
return nil, errors.New("unrecognized UPnP device of type " + respondingDeviceType)
}
deviceDescriptionLocation := response.Header.Get("Location")
if deviceDescriptionLocation == "" {
return IGD{}, errors.New("invalid IGD response: no location specified")
return nil, errors.New("invalid IGD response: no location specified")
}
deviceDescriptionURL, err := url.Parse(deviceDescriptionLocation)
@ -223,29 +219,24 @@ func parseResponse(deviceType string, resp []byte) (IGD, error) {
deviceUSN := response.Header.Get("USN")
if deviceUSN == "" {
return IGD{}, errors.New("invalid IGD response: USN not specified")
return nil, errors.New("invalid IGD response: USN not specified")
}
deviceUUID := strings.TrimPrefix(strings.Split(deviceUSN, "::")[0], "uuid:")
response, err = http.Get(deviceDescriptionLocation)
if err != nil {
return IGD{}, err
return nil, err
}
defer response.Body.Close()
if response.StatusCode >= 400 {
return IGD{}, errors.New("bad status code:" + response.Status)
return nil, errors.New("bad status code:" + response.Status)
}
var upnpRoot upnpRoot
err = xml.NewDecoder(response.Body).Decode(&upnpRoot)
if err != nil {
return IGD{}, err
}
services, err := getServiceDescriptions(deviceDescriptionLocation, upnpRoot.Device)
if err != nil {
return IGD{}, err
return nil, err
}
// Figure out our IP number, on the network used to reach the IGD.
@ -254,16 +245,15 @@ func parseResponse(deviceType string, resp []byte) (IGD, error) {
// suggestions on a better way to do this...
localIPAddress, err := localIP(deviceDescriptionURL)
if err != nil {
return IGD{}, err
return nil, err
}
return IGD{
uuid: deviceUUID,
friendlyName: upnpRoot.Device.FriendlyName,
url: deviceDescriptionURL,
services: services,
localIPAddress: localIPAddress,
}, nil
services, err := getServiceDescriptions(deviceUUID, localIPAddress, deviceDescriptionLocation, upnpRoot.Device)
if err != nil {
return nil, err
}
return services, nil
}
func localIP(url *url.URL) (net.IP, error) {
@ -301,18 +291,18 @@ func getChildServices(d upnpDevice, serviceType string) []upnpService {
return result
}
func getServiceDescriptions(rootURL string, device upnpDevice) ([]IGDService, error) {
func getServiceDescriptions(deviceUUID string, localIPAddress net.IP, rootURL string, device upnpDevice) ([]IGDService, error) {
var result []IGDService
if device.DeviceType == "urn:schemas-upnp-org:device:InternetGatewayDevice:1" {
descriptions := getIGDServices(rootURL, device,
descriptions := getIGDServices(deviceUUID, localIPAddress, rootURL, device,
"urn:schemas-upnp-org:device:WANDevice:1",
"urn:schemas-upnp-org:device:WANConnectionDevice:1",
[]string{"urn:schemas-upnp-org:service:WANIPConnection:1", "urn:schemas-upnp-org:service:WANPPPConnection:1"})
result = append(result, descriptions...)
} else if device.DeviceType == "urn:schemas-upnp-org:device:InternetGatewayDevice:2" {
descriptions := getIGDServices(rootURL, device,
descriptions := getIGDServices(deviceUUID, localIPAddress, rootURL, device,
"urn:schemas-upnp-org:device:WANDevice:2",
"urn:schemas-upnp-org:device:WANConnectionDevice:2",
[]string{"urn:schemas-upnp-org:service:WANIPConnection:2", "urn:schemas-upnp-org:service:WANPPPConnection:2"})
@ -328,7 +318,7 @@ func getServiceDescriptions(rootURL string, device upnpDevice) ([]IGDService, er
return result, nil
}
func getIGDServices(rootURL string, device upnpDevice, wanDeviceURN string, wanConnectionURN string, URNs []string) []IGDService {
func getIGDServices(deviceUUID string, localIPAddress net.IP, rootURL string, device upnpDevice, wanDeviceURN string, wanConnectionURN string, URNs []string) []IGDService {
var result []IGDService
devices := getChildDevices(device, wanDeviceURN)
@ -360,7 +350,14 @@ func getIGDServices(rootURL string, device upnpDevice, wanDeviceURN string, wanC
l.Debugln(rootURL, "- found", service.Type, "with URL", u)
service := IGDService{ID: service.ID, URL: u.String(), URN: service.Type}
service := IGDService{
UUID: deviceUUID,
Device: device,
ServiceID: service.ID,
URL: u.String(),
URN: service.Type,
LocalIP: localIPAddress,
}
result = append(result, service)
}