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Implemented support for UPnP

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This commit is contained in:
obscuren 2014-02-02 19:22:39 +01:00
parent ae0d4eb7aa
commit 3f503ffc7f
4 changed files with 182 additions and 125 deletions
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62
ethereum.go
View File

@ -8,6 +8,7 @@ import (
"github.com/ethereum/ethwire-go"
"log"
"net"
"strconv"
"sync"
"sync/atomic"
"time"
@ -29,6 +30,7 @@ const (
type Ethereum struct {
// Channel for shutting down the ethereum
shutdownChan chan bool
quit chan bool
// DB interface
//db *ethdb.LDBDatabase
db *ethdb.MemDatabase
@ -48,6 +50,8 @@ type Ethereum struct {
// Capabilities for outgoing peers
serverCaps Caps
nat NAT
}
func New(caps Caps) (*Ethereum, error) {
@ -57,15 +61,30 @@ func New(caps Caps) (*Ethereum, error) {
return nil, err
}
/*
gateway := net.ParseIP("192.168.192.1")
nat := NewNatPMP(gateway)
port, err := nat.AddPortMapping("tcp", 30303, 30303, "", 60)
log.Println(port, err)
*/
nat, err := Discover()
if err != nil {
log.Println("UPnP failed", err)
return nil, err
}
ethutil.Config.Db = db
nonce, _ := ethutil.RandomUint64()
ethereum := &Ethereum{
shutdownChan: make(chan bool),
quit: make(chan bool),
db: db,
peers: list.New(),
Nonce: nonce,
serverCaps: caps,
nat: nat,
}
ethereum.TxPool = ethchain.NewTxPool()
ethereum.TxPool.Speaker = ethereum
@ -217,6 +236,8 @@ func (s *Ethereum) Start() {
go s.peerHandler(ln)
}
go s.upnpUpdateThread()
// Start the reaping processes
go s.ReapDeadPeerHandler()
@ -245,6 +266,8 @@ func (s *Ethereum) Stop() {
p.Stop()
})
close(s.quit)
s.shutdownChan <- true
s.TxPool.Stop()
@ -254,3 +277,42 @@ func (s *Ethereum) Stop() {
func (s *Ethereum) WaitForShutdown() {
<-s.shutdownChan
}
func (s *Ethereum) upnpUpdateThread() {
// Go off immediately to prevent code duplication, thereafter we renew
// lease every 15 minutes.
timer := time.NewTimer(0 * time.Second)
lport, _ := strconv.ParseInt("30303", 10, 16)
first := true
out:
for {
select {
case <-timer.C:
listenPort, err := s.nat.AddPortMapping("TCP", int(lport), int(lport), "eth listen port", 20*60)
if err != nil {
log.Println("can't add UPnP port mapping:", err)
break out
}
if first && err == nil {
externalip, err := s.nat.GetExternalAddress()
if err != nil {
log.Println("UPnP can't get external address:", err)
continue out
}
log.Println("Successfully bound via UPnP to", externalip, listenPort)
first = false
}
timer.Reset(time.Minute * 15)
case <-s.quit:
break out
}
}
timer.Stop()
if err := s.nat.DeletePortMapping("TCP", int(lport), int(lport)); err != nil {
log.Println("unable to remove UPnP port mapping:", err)
} else {
log.Println("succesfully disestablished UPnP port mapping")
}
}

12
nat.go Normal file
View File

@ -0,0 +1,12 @@
package eth
import (
"net"
)
// protocol is either "udp" or "tcp"
type NAT interface {
GetExternalAddress() (addr net.IP, err error)
AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error)
DeletePortMapping(protocol string, externalPort, internalPort int) (err error)
}

54
natpmp.go Normal file
View File

@ -0,0 +1,54 @@
package eth
import (
natpmp "code.google.com/p/go-nat-pmp"
"fmt"
"net"
)
// Adapt the NAT-PMP protocol to the NAT interface
// TODO:
// + Register for changes to the external address.
// + Re-register port mapping when router reboots.
// + A mechanism for keeping a port mapping registered.
type natPMPClient struct {
client *natpmp.Client
}
func NewNatPMP(gateway net.IP) (nat NAT) {
return &natPMPClient{natpmp.NewClient(gateway)}
}
func (n *natPMPClient) GetExternalAddress() (addr net.IP, err error) {
response, err := n.client.GetExternalAddress()
if err != nil {
return
}
ip := response.ExternalIPAddress
addr = net.IPv4(ip[0], ip[1], ip[2], ip[3])
return
}
func (n *natPMPClient) AddPortMapping(protocol string, externalPort, internalPort int,
description string, timeout int) (mappedExternalPort int, err error) {
if timeout <= 0 {
err = fmt.Errorf("timeout must not be <= 0")
return
}
// Note order of port arguments is switched between our AddPortMapping and the client's AddPortMapping.
response, err := n.client.AddPortMapping(protocol, internalPort, externalPort, timeout)
if err != nil {
return
}
mappedExternalPort = int(response.MappedExternalPort)
return
}
func (n *natPMPClient) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) {
// To destroy a mapping, send an add-port with
// an internalPort of the internal port to destroy, an external port of zero and a time of zero.
_, err = n.client.AddPortMapping(protocol, internalPort, 0, 0)
return
}

179
upnp.go → natupnp.go
View File

@ -1,34 +1,5 @@
package eth
// Upnp code taken from Taipei Torrent license is below:
// Copyright (c) 2010 Jack Palevich. All rights reserved.
//
// 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.
// Just enough UPnP to be able to forward ports
//
@ -44,27 +15,11 @@ import (
"time"
)
// NAT is an interface representing a NAT traversal options for example UPNP or
// NAT-PMP. It provides methods to query and manipulate this traversal to allow
// access to services.
type NAT interface {
// Get the external address from outside the NAT.
GetExternalAddress() (addr net.IP, err error)
// Add a port mapping for protocol ("udp" or "tcp") from externalport to
// internal port with description lasting for timeout.
AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error)
// Remove a previously added port mapping from externalport to
// internal port.
DeletePortMapping(protocol string, externalPort, internalPort int) (err error)
}
type upnpNAT struct {
serviceURL string
ourIP string
}
// Discover searches the local network for a UPnP router returning a NAT
// for the network if so, nil if not.
func Discover() (nat NAT, err error) {
ssdp, err := net.ResolveUDPAddr("udp4", "239.255.255.250:1900")
if err != nil {
@ -77,7 +32,7 @@ func Discover() (nat NAT, err error) {
socket := conn.(*net.UDPConn)
defer socket.Close()
err = socket.SetDeadline(time.Now().Add(3 * time.Second))
err = socket.SetDeadline(time.Now().Add(10 * time.Second))
if err != nil {
return
}
@ -134,7 +89,7 @@ func Discover() (nat NAT, err error) {
nat = &upnpNAT{serviceURL: serviceURL, ourIP: ourIP}
return
}
err = errors.New("UPnP port discovery failed")
err = errors.New("UPnP port discovery failed.")
return
}
@ -190,39 +145,38 @@ type root struct {
Device device
}
// getChildDevice searches the children of device for a device with the given
// type.
func getChildDevice(d *device, deviceType string) *device {
for i := range d.DeviceList.Device {
if d.DeviceList.Device[i].DeviceType == deviceType {
return &d.DeviceList.Device[i]
dl := d.DeviceList.Device
for i := 0; i < len(dl); i++ {
if dl[i].DeviceType == deviceType {
return &dl[i]
}
}
return nil
}
// getChildDevice searches the service list of device for a service with the
// given type.
func getChildService(d *device, serviceType string) *service {
for i := range d.ServiceList.Service {
if d.ServiceList.Service[i].ServiceType == serviceType {
return &d.ServiceList.Service[i]
sl := d.ServiceList.Service
for i := 0; i < len(sl); i++ {
if sl[i].ServiceType == serviceType {
return &sl[i]
}
}
return nil
}
// getOurIP returns a best guess at what the local IP is.
func getOurIP() (ip string, err error) {
hostname, err := os.Hostname()
if err != nil {
return
}
return net.LookupCNAME(hostname)
p, err := net.LookupIP(hostname)
if err != nil && len(p) > 0 {
return
}
return p[0].String(), nil
}
// getServiceURL parses the xml description at the given root url to find the
// url for the WANIPConnection service to be used for port forwarding.
func getServiceURL(rootURL string) (url string, err error) {
r, err := http.Get(rootURL)
if err != nil {
@ -235,34 +189,34 @@ func getServiceURL(rootURL string) (url string, err error) {
}
var root root
err = xml.NewDecoder(r.Body).Decode(&root)
if err != nil {
return
}
a := &root.Device
if a.DeviceType != "urn:schemas-upnp-org:device:InternetGatewayDevice:1" {
err = errors.New("no InternetGatewayDevice")
err = errors.New("No InternetGatewayDevice")
return
}
b := getChildDevice(a, "urn:schemas-upnp-org:device:WANDevice:1")
if b == nil {
err = errors.New("no WANDevice")
err = errors.New("No WANDevice")
return
}
c := getChildDevice(b, "urn:schemas-upnp-org:device:WANConnectionDevice:1")
if c == nil {
err = errors.New("no WANConnectionDevice")
err = errors.New("No WANConnectionDevice")
return
}
d := getChildService(c, "urn:schemas-upnp-org:service:WANIPConnection:1")
if d == nil {
err = errors.New("no WANIPConnection")
err = errors.New("No WANIPConnection")
return
}
url = combineURL(rootURL, d.ControlURL)
return
}
// combineURL appends subURL onto rootURL.
func combineURL(rootURL, subURL string) string {
protocolEnd := "://"
protoEndIndex := strings.Index(rootURL, protocolEnd)
@ -271,24 +225,7 @@ func combineURL(rootURL, subURL string) string {
return rootURL[0:protoEndIndex+len(protocolEnd)+rootIndex] + subURL
}
// soapBody represents the <s:Body> element in a SOAP reply.
// fields we don't care about are elided.
type soapBody struct {
XMLName xml.Name `xml:"Body"`
Data []byte `xml:",innerxml"`
}
// soapEnvelope represents the <s:Envelope> element in a SOAP reply.
// fields we don't care about are elided.
type soapEnvelope struct {
XMLName xml.Name `xml:"Envelope"`
Body soapBody `xml:"Body"`
}
// soapRequests performs a soap request with the given parameters and returns
// the xml replied stripped of the soap headers. in the case that the request is
// unsuccessful the an error is returned.
func soapRequest(url, function, message string) (replyXML []byte, err error) {
func soapRequest(url, function, message string) (r *http.Response, err error) {
fullMessage := "<?xml version=\"1.0\" ?>" +
"<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">\r\n" +
"<s:Body>" + message + "</s:Body></s:Envelope>"
@ -305,10 +242,10 @@ func soapRequest(url, function, message string) (replyXML []byte, err error) {
req.Header.Set("Cache-Control", "no-cache")
req.Header.Set("Pragma", "no-cache")
r, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
// log.Stderr("soapRequest ", req)
//fmt.Println(fullMessage)
r, err = http.DefaultClient.Do(req)
if r.Body != nil {
defer r.Body.Close()
}
@ -319,45 +256,39 @@ func soapRequest(url, function, message string) (replyXML []byte, err error) {
r = nil
return
}
var reply soapEnvelope
err = xml.NewDecoder(r.Body).Decode(&reply)
return
}
type statusInfo struct {
externalIpAddress string
}
func (n *upnpNAT) getStatusInfo() (info statusInfo, err error) {
message := "<u:GetStatusInfo xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
"</u:GetStatusInfo>"
var response *http.Response
response, err = soapRequest(n.serviceURL, "GetStatusInfo", message)
if err != nil {
return nil, err
}
return reply.Body.Data, nil
return
}
// getExternalIPAddressResponse represents the XML response to a
// GetExternalIPAddress SOAP request.
type getExternalIPAddressResponse struct {
XMLName xml.Name `xml:"GetExternalIPAddressResponse"`
ExternalIPAddress string `xml:"NewExternalIPAddress"`
// TODO: Write a soap reply parser. It has to eat the Body and envelope tags...
response.Body.Close()
return
}
// GetExternalAddress implements the NAT interface by fetching the external IP
// from the UPnP router.
func (n *upnpNAT) GetExternalAddress() (addr net.IP, err error) {
message := "<u:GetExternalIPAddress xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\"/>\r\n"
response, err := soapRequest(n.serviceURL, "GetExternalIPAddress", message)
info, err := n.getStatusInfo()
if err != nil {
return nil, err
return
}
addr = net.ParseIP(info.externalIpAddress)
return
}
var reply getExternalIPAddressResponse
err = xml.Unmarshal(response, &reply)
if err != nil {
return nil, err
}
addr = net.ParseIP(reply.ExternalIPAddress)
if addr == nil {
return nil, errors.New("unable to parse ip address")
}
return addr, nil
}
// AddPortMapping implements the NAT interface by setting up a port forwarding
// from the UPnP router to the local machine with the given ports and protocol.
func (n *upnpNAT) AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error) {
// A single concatenation would break ARM compilation.
message := "<u:AddPortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
@ -370,22 +301,19 @@ func (n *upnpNAT) AddPortMapping(protocol string, externalPort, internalPort int
"</NewPortMappingDescription><NewLeaseDuration>" + strconv.Itoa(timeout) +
"</NewLeaseDuration></u:AddPortMapping>"
response, err := soapRequest(n.serviceURL, "AddPortMapping", message)
var response *http.Response
response, err = soapRequest(n.serviceURL, "AddPortMapping", message)
if err != nil {
return
}
// TODO: check response to see if the port was forwarded
// If the port was not wildcard we don't get an reply with the port in
// it. Not sure about wildcard yet. miniupnpc just checks for error
// codes here.
// log.Println(message, response)
mappedExternalPort = externalPort
_ = response
return
}
// AddPortMapping implements the NAT interface by removing up a port forwarding
// from the UPnP router to the local machine with the given ports and.
func (n *upnpNAT) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) {
message := "<u:DeletePortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
@ -393,7 +321,8 @@ func (n *upnpNAT) DeletePortMapping(protocol string, externalPort, internalPort
"</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>" +
"</u:DeletePortMapping>"
response, err := soapRequest(n.serviceURL, "DeletePortMapping", message)
var response *http.Response
response, err = soapRequest(n.serviceURL, "DeletePortMapping", message)
if err != nil {
return
}