syncthing/lib/upnp/igd_service.go

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// 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 (
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"context"
"encoding/xml"
"fmt"
"net"
"time"
"github.com/syncthing/syncthing/lib/nat"
)
// An IGDService is a specific service provided by an IGD.
type IGDService struct {
UUID string
Device upnpDevice
ServiceID string
URL string
URN string
LocalIP net.IP
}
// AddPortMapping adds a port mapping to the specified IGD service.
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func (s *IGDService) AddPortMapping(ctx context.Context, protocol nat.Protocol, internalPort, externalPort int, description string, duration time.Duration) (int, error) {
tpl := `<u:AddPortMapping xmlns:u="%s">
<NewRemoteHost></NewRemoteHost>
<NewExternalPort>%d</NewExternalPort>
<NewProtocol>%s</NewProtocol>
<NewInternalPort>%d</NewInternalPort>
<NewInternalClient>%s</NewInternalClient>
<NewEnabled>1</NewEnabled>
<NewPortMappingDescription>%s</NewPortMappingDescription>
<NewLeaseDuration>%d</NewLeaseDuration>
</u:AddPortMapping>`
body := fmt.Sprintf(tpl, s.URN, externalPort, protocol, internalPort, s.LocalIP, description, duration/time.Second)
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response, err := soapRequest(ctx, 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 externalPort, unmarshalErr
}
if envelope.ErrorCode == 725 {
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return s.AddPortMapping(ctx, protocol, internalPort, externalPort, description, 0)
}
}
return externalPort, err
}
// DeletePortMapping deletes a port mapping from the specified IGD service.
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func (s *IGDService) DeletePortMapping(ctx context.Context, protocol nat.Protocol, externalPort int) error {
tpl := `<u:DeletePortMapping xmlns:u="%s">
<NewRemoteHost></NewRemoteHost>
<NewExternalPort>%d</NewExternalPort>
<NewProtocol>%s</NewProtocol>
</u:DeletePortMapping>`
body := fmt.Sprintf(tpl, s.URN, externalPort, protocol)
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_, err := soapRequest(ctx, s.URL, s.URN, "DeletePortMapping", body)
return err
}
// GetExternalIPAddress queries the IGD service for its external IP address.
// Returns nil if the external IP address is invalid or undefined, along with
// any relevant errors
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func (s *IGDService) GetExternalIPAddress(ctx context.Context) (net.IP, error) {
tpl := `<u:GetExternalIPAddress xmlns:u="%s" />`
body := fmt.Sprintf(tpl, s.URN)
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response, err := soapRequest(ctx, s.URL, s.URN, "GetExternalIPAddress", body)
if err != nil {
return nil, err
}
envelope := &soapGetExternalIPAddressResponseEnvelope{}
err = xml.Unmarshal(response, envelope)
if err != nil {
return nil, err
}
result := net.ParseIP(envelope.Body.GetExternalIPAddressResponse.NewExternalIPAddress)
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
}