mv internal lib
This commit is contained in:
Jakob Borg
607
lib/upnp/upnp.go
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607
lib/upnp/upnp.go
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@@ -0,0 +1,607 @@
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// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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// Adapted from https://github.com/jackpal/Taipei-Torrent/blob/dd88a8bfac6431c01d959ce3c745e74b8a911793/IGD.go
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// Copyright (c) 2010 Jack Palevich (https://github.com/jackpal/Taipei-Torrent/blob/dd88a8bfac6431c01d959ce3c745e74b8a911793/LICENSE)
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// Package upnp implements UPnP InternetGatewayDevice discovery, querying, and port mapping.
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package upnp
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import (
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"bufio"
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"bytes"
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"encoding/xml"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"regexp"
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"runtime"
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"strings"
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"time"
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"github.com/syncthing/syncthing/lib/sync"
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)
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// An IGD is a UPnP InternetGatewayDevice.
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type IGD struct {
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uuid string
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friendlyName string
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services []IGDService
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url *url.URL
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localIPAddress string
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}
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func (n *IGD) UUID() string {
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return n.uuid
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}
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func (n *IGD) FriendlyName() string {
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return n.friendlyName
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}
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// FriendlyIdentifier returns a friendly identifier (friendly name + IP
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// address) for the IGD.
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func (n *IGD) FriendlyIdentifier() string {
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return "'" + n.FriendlyName() + "' (" + strings.Split(n.URL().Host, ":")[0] + ")"
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}
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func (n *IGD) URL() *url.URL {
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return n.url
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}
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// An IGDService is a specific service provided by an IGD.
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type IGDService struct {
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serviceID string
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serviceURL string
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serviceURN string
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}
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func (s *IGDService) ID() string {
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return s.serviceID
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}
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type Protocol string
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const (
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TCP Protocol = "TCP"
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UDP = "UDP"
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)
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type upnpService struct {
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ServiceID string `xml:"serviceId"`
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ServiceType string `xml:"serviceType"`
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ControlURL string `xml:"controlURL"`
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}
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type upnpDevice struct {
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DeviceType string `xml:"deviceType"`
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FriendlyName string `xml:"friendlyName"`
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Devices []upnpDevice `xml:"deviceList>device"`
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Services []upnpService `xml:"serviceList>service"`
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}
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type upnpRoot struct {
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Device upnpDevice `xml:"device"`
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}
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// Discover discovers UPnP InternetGatewayDevices.
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// The order in which the devices appear in the results list is not deterministic.
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func Discover(timeout time.Duration) []IGD {
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var results []IGD
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interfaces, err := net.Interfaces()
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if err != nil {
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l.Infoln("Listing network interfaces:", err)
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return results
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}
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resultChan := make(chan IGD)
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wg := sync.NewWaitGroup()
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for _, intf := range interfaces {
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// Interface flags seem to always be 0 on Windows
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if runtime.GOOS != "windows" && (intf.Flags&net.FlagUp == 0 || intf.Flags&net.FlagMulticast == 0) {
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continue
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}
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for _, deviceType := range []string{"urn:schemas-upnp-org:device:InternetGatewayDevice:1", "urn:schemas-upnp-org:device:InternetGatewayDevice:2"} {
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wg.Add(1)
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go func(intf net.Interface, deviceType string) {
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discover(&intf, deviceType, timeout, resultChan)
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wg.Done()
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}(intf, deviceType)
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}
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}
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go func() {
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wg.Wait()
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close(resultChan)
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}()
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nextResult:
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for result := range resultChan {
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for _, existingResult := range results {
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if existingResult.uuid == result.uuid {
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if debug {
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l.Debugf("Skipping duplicate result %s with services:", result.uuid)
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for _, svc := range result.services {
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l.Debugf("* [%s] %s", svc.serviceID, svc.serviceURL)
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}
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}
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continue nextResult
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}
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}
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results = append(results, result)
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if debug {
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l.Debugf("UPnP discovery result %s with services:", result.uuid)
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for _, svc := range result.services {
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l.Debugf("* [%s] %s", svc.serviceID, svc.serviceURL)
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}
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}
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}
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return results
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}
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// Search for UPnP InternetGatewayDevices for <timeout> seconds, ignoring responses from any devices listed in knownDevices.
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// The order in which the devices appear in the result list is not deterministic
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func discover(intf *net.Interface, deviceType string, timeout time.Duration, results chan<- IGD) {
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ssdp := &net.UDPAddr{IP: []byte{239, 255, 255, 250}, Port: 1900}
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tpl := `M-SEARCH * HTTP/1.1
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Host: 239.255.255.250:1900
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St: %s
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Man: "ssdp:discover"
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Mx: %d
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`
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searchStr := fmt.Sprintf(tpl, deviceType, timeout/time.Second)
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search := []byte(strings.Replace(searchStr, "\n", "\r\n", -1))
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if debug {
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l.Debugln("Starting discovery of device type " + deviceType + " on " + intf.Name)
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}
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socket, err := net.ListenMulticastUDP("udp4", intf, &net.UDPAddr{IP: ssdp.IP})
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if err != nil {
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if debug {
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l.Debugln(err)
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}
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return
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}
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defer socket.Close() // Make sure our socket gets closed
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err = socket.SetDeadline(time.Now().Add(timeout))
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if err != nil {
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l.Infoln(err)
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return
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}
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if debug {
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l.Debugln("Sending search request for device type " + deviceType + " on " + intf.Name)
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}
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_, err = socket.WriteTo(search, ssdp)
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if err != nil {
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l.Infoln(err)
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return
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}
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if debug {
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l.Debugln("Listening for UPnP response for device type " + deviceType + " on " + intf.Name)
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}
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// Listen for responses until a timeout is reached
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for {
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resp := make([]byte, 65536)
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n, _, err := socket.ReadFrom(resp)
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if err != nil {
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if e, ok := err.(net.Error); !ok || !e.Timeout() {
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l.Infoln("UPnP read:", err) //legitimate error, not a timeout.
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}
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break
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}
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igd, err := parseResponse(deviceType, resp[:n])
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if err != nil {
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l.Infoln("UPnP parse:", err)
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continue
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}
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results <- igd
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}
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if debug {
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l.Debugln("Discovery for device type " + deviceType + " on " + intf.Name + " finished.")
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}
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}
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func parseResponse(deviceType string, resp []byte) (IGD, error) {
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if debug {
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l.Debugln("Handling UPnP response:\n\n" + string(resp))
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}
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reader := bufio.NewReader(bytes.NewBuffer(resp))
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request := &http.Request{}
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response, err := http.ReadResponse(reader, request)
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if err != nil {
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return IGD{}, err
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}
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respondingDeviceType := response.Header.Get("St")
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if respondingDeviceType != deviceType {
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return IGD{}, errors.New("unrecognized UPnP device of type " + respondingDeviceType)
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}
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deviceDescriptionLocation := response.Header.Get("Location")
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if deviceDescriptionLocation == "" {
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return IGD{}, errors.New("invalid IGD response: no location specified")
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}
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deviceDescriptionURL, err := url.Parse(deviceDescriptionLocation)
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if err != nil {
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l.Infoln("Invalid IGD location: " + err.Error())
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}
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deviceUSN := response.Header.Get("USN")
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if deviceUSN == "" {
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return IGD{}, errors.New("invalid IGD response: USN not specified")
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}
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deviceUUID := strings.TrimPrefix(strings.Split(deviceUSN, "::")[0], "uuid:")
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matched, err := regexp.MatchString("[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}", deviceUUID)
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if !matched {
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l.Infoln("Invalid IGD response: invalid device UUID", deviceUUID, "(continuing anyway)")
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}
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response, err = http.Get(deviceDescriptionLocation)
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if err != nil {
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return IGD{}, err
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}
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defer response.Body.Close()
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if response.StatusCode >= 400 {
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return IGD{}, errors.New("bad status code:" + response.Status)
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}
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var upnpRoot upnpRoot
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err = xml.NewDecoder(response.Body).Decode(&upnpRoot)
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if err != nil {
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return IGD{}, err
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}
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services, err := getServiceDescriptions(deviceDescriptionLocation, upnpRoot.Device)
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if err != nil {
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return IGD{}, err
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}
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// Figure out our IP number, on the network used to reach the IGD.
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// We do this in a fairly roundabout way by connecting to the IGD and
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// checking the address of the local end of the socket. I'm open to
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// suggestions on a better way to do this...
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localIPAddress, err := localIP(deviceDescriptionURL)
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if err != nil {
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return IGD{}, err
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}
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return IGD{
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uuid: deviceUUID,
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friendlyName: upnpRoot.Device.FriendlyName,
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url: deviceDescriptionURL,
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services: services,
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localIPAddress: localIPAddress,
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}, nil
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}
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func localIP(url *url.URL) (string, error) {
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conn, err := net.Dial("tcp", url.Host)
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if err != nil {
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return "", err
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}
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defer conn.Close()
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localIPAddress, _, err := net.SplitHostPort(conn.LocalAddr().String())
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if err != nil {
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return "", err
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}
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return localIPAddress, nil
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}
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func getChildDevices(d upnpDevice, deviceType string) []upnpDevice {
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var result []upnpDevice
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for _, dev := range d.Devices {
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if dev.DeviceType == deviceType {
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result = append(result, dev)
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}
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}
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return result
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}
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func getChildServices(d upnpDevice, serviceType string) []upnpService {
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var result []upnpService
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for _, svc := range d.Services {
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if svc.ServiceType == serviceType {
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result = append(result, svc)
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}
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}
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return result
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}
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func getServiceDescriptions(rootURL string, device upnpDevice) ([]IGDService, error) {
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var result []IGDService
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if device.DeviceType == "urn:schemas-upnp-org:device:InternetGatewayDevice:1" {
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descriptions := getIGDServices(rootURL, device,
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"urn:schemas-upnp-org:device:WANDevice:1",
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"urn:schemas-upnp-org:device:WANConnectionDevice:1",
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[]string{"urn:schemas-upnp-org:service:WANIPConnection:1", "urn:schemas-upnp-org:service:WANPPPConnection:1"})
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result = append(result, descriptions...)
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} else if device.DeviceType == "urn:schemas-upnp-org:device:InternetGatewayDevice:2" {
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descriptions := getIGDServices(rootURL, device,
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"urn:schemas-upnp-org:device:WANDevice:2",
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"urn:schemas-upnp-org:device:WANConnectionDevice:2",
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[]string{"urn:schemas-upnp-org:service:WANIPConnection:2", "urn:schemas-upnp-org:service:WANPPPConnection:1"})
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result = append(result, descriptions...)
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} else {
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return result, errors.New("[" + rootURL + "] Malformed root device description: not an InternetGatewayDevice.")
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}
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if len(result) < 1 {
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return result, errors.New("[" + rootURL + "] Malformed device description: no compatible service descriptions found.")
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}
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return result, nil
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}
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func getIGDServices(rootURL string, device upnpDevice, wanDeviceURN string, wanConnectionURN string, serviceURNs []string) []IGDService {
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var result []IGDService
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devices := getChildDevices(device, wanDeviceURN)
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if len(devices) < 1 {
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l.Infoln("[" + rootURL + "] Malformed InternetGatewayDevice description: no WANDevices specified.")
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return result
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}
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for _, device := range devices {
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connections := getChildDevices(device, wanConnectionURN)
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if len(connections) < 1 {
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l.Infoln("[" + rootURL + "] Malformed " + wanDeviceURN + " description: no WANConnectionDevices specified.")
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}
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for _, connection := range connections {
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for _, serviceURN := range serviceURNs {
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services := getChildServices(connection, serviceURN)
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if len(services) < 1 && debug {
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l.Debugln("[" + rootURL + "] No services of type " + serviceURN + " found on connection.")
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}
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for _, service := range services {
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if len(service.ControlURL) == 0 {
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l.Infoln("[" + rootURL + "] Malformed " + service.ServiceType + " description: no control URL.")
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} else {
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u, _ := url.Parse(rootURL)
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replaceRawPath(u, service.ControlURL)
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if debug {
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l.Debugln("[" + rootURL + "] Found " + service.ServiceType + " with URL " + u.String())
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}
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service := IGDService{serviceID: service.ServiceID, serviceURL: u.String(), serviceURN: service.ServiceType}
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result = append(result, service)
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}
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}
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}
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}
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}
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return result
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}
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func replaceRawPath(u *url.URL, rp string) {
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asURL, err := url.Parse(rp)
|
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if err != nil {
|
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return
|
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} else if asURL.IsAbs() {
|
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u.Path = asURL.Path
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u.RawQuery = asURL.RawQuery
|
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} else {
|
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var p, q string
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fs := strings.Split(rp, "?")
|
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p = fs[0]
|
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if len(fs) > 1 {
|
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q = fs[1]
|
||||
}
|
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|
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if p[0] == '/' {
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u.Path = p
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} else {
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u.Path += p
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}
|
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u.RawQuery = q
|
||||
}
|
||||
}
|
||||
|
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func soapRequest(url, service, function, message string) ([]byte, error) {
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tpl := `<?xml version="1.0" ?>
|
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<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
|
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<s:Body>%s</s:Body>
|
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</s:Envelope>
|
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`
|
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var resp []byte
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||||
|
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body := fmt.Sprintf(tpl, message)
|
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|
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req, err := http.NewRequest("POST", url, strings.NewReader(body))
|
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if err != nil {
|
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return resp, err
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||||
}
|
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req.Close = true
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req.Header.Set("Content-Type", `text/xml; charset="utf-8"`)
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req.Header.Set("User-Agent", "syncthing/1.0")
|
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req.Header["SOAPAction"] = []string{fmt.Sprintf(`"%s#%s"`, service, function)} // Enforce capitalization in header-entry for sensitive routers. See issue #1696
|
||||
req.Header.Set("Connection", "Close")
|
||||
req.Header.Set("Cache-Control", "no-cache")
|
||||
req.Header.Set("Pragma", "no-cache")
|
||||
|
||||
if debug {
|
||||
l.Debugln("SOAP Request URL: " + url)
|
||||
l.Debugln("SOAP Action: " + req.Header.Get("SOAPAction"))
|
||||
l.Debugln("SOAP Request:\n\n" + body)
|
||||
}
|
||||
|
||||
r, err := http.DefaultClient.Do(req)
|
||||
if err != nil {
|
||||
if debug {
|
||||
l.Debugln(err)
|
||||
}
|
||||
return resp, err
|
||||
}
|
||||
|
||||
resp, _ = ioutil.ReadAll(r.Body)
|
||||
if debug {
|
||||
l.Debugf("SOAP Response: %v\n\n%v\n\n", r.StatusCode, string(resp))
|
||||
}
|
||||
|
||||
r.Body.Close()
|
||||
|
||||
if r.StatusCode >= 400 {
|
||||
return resp, errors.New(function + ": " + r.Status)
|
||||
}
|
||||
|
||||
return resp, nil
|
||||
}
|
||||
|
||||
// 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 Protocol, externalPort, internalPort int, description string, timeout int) error {
|
||||
for _, service := range n.services {
|
||||
err := service.AddPortMapping(n.localIPAddress, protocol, externalPort, internalPort, description, timeout)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return 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 Protocol, externalPort int) error {
|
||||
for _, service := range n.services {
|
||||
err := service.DeletePortMapping(protocol, externalPort)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
type soapGetExternalIPAddressResponseEnvelope struct {
|
||||
XMLName xml.Name
|
||||
Body soapGetExternalIPAddressResponseBody `xml:"Body"`
|
||||
}
|
||||
|
||||
type soapGetExternalIPAddressResponseBody struct {
|
||||
XMLName xml.Name
|
||||
GetExternalIPAddressResponse getExternalIPAddressResponse `xml:"GetExternalIPAddressResponse"`
|
||||
}
|
||||
|
||||
type getExternalIPAddressResponse struct {
|
||||
NewExternalIPAddress string `xml:"NewExternalIPAddress"`
|
||||
}
|
||||
|
||||
type soapErrorResponse struct {
|
||||
ErrorCode int `xml:"Body>Fault>detail>UPnPError>errorCode"`
|
||||
ErrorDescription string `xml:"Body>Fault>detail>UPnPError>errorDescription"`
|
||||
}
|
||||
|
||||
// AddPortMapping adds a port mapping to the specified IGD service.
|
||||
func (s *IGDService) AddPortMapping(localIPAddress string, protocol Protocol, externalPort, internalPort int, description string, timeout 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.serviceURN, externalPort, protocol, internalPort, localIPAddress, description, timeout)
|
||||
|
||||
response, err := soapRequest(s.serviceURL, s.serviceURN, "AddPortMapping", body)
|
||||
if err != nil && timeout > 0 {
|
||||
// Try to repair error code 725 - OnlyPermanentLeasesSupported
|
||||
envelope := &soapErrorResponse{}
|
||||
err = xml.Unmarshal(response, envelope)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if envelope.ErrorCode == 725 {
|
||||
return s.AddPortMapping(localIPAddress, protocol, externalPort, internalPort, description, 0)
|
||||
}
|
||||
}
|
||||
|
||||
return err
|
||||
}
|
||||
|
||||
// DeletePortMapping deletes a port mapping from the specified IGD service.
|
||||
func (s *IGDService) DeletePortMapping(protocol 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.serviceURN, externalPort, protocol)
|
||||
|
||||
_, err := soapRequest(s.serviceURL, s.serviceURN, "DeletePortMapping", body)
|
||||
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// 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
|
||||
func (s *IGDService) GetExternalIPAddress() (net.IP, error) {
|
||||
tpl := `<u:GetExternalIPAddress xmlns:u="%s" />`
|
||||
|
||||
body := fmt.Sprintf(tpl, s.serviceURN)
|
||||
|
||||
response, err := soapRequest(s.serviceURL, s.serviceURN, "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
|
||||
}
|
||||
Reference in New Issue
Block a user