2015-07-07 00:54:22 +00:00
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// Copyright 2015 The go-ethereum Authors
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2015-07-22 16:48:40 +00:00
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// This file is part of the go-ethereum library.
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2015-07-07 00:54:22 +00:00
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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2015-07-22 16:48:40 +00:00
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// The go-ethereum library is distributed in the hope that it will be useful,
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2015-07-07 00:54:22 +00:00
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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2015-07-22 16:48:40 +00:00
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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2015-07-07 00:54:22 +00:00
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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2015-07-22 16:48:40 +00:00
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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2015-07-07 00:54:22 +00:00
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2015-02-10 22:49:45 +00:00
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package nat
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import (
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"errors"
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"fmt"
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"net"
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"strings"
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"time"
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2015-02-17 12:10:11 +00:00
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"github.com/huin/goupnp"
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"github.com/huin/goupnp/dcps/internetgateway1"
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"github.com/huin/goupnp/dcps/internetgateway2"
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2015-02-10 22:49:45 +00:00
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)
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2015-06-04 12:05:52 +00:00
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const soapRequestTimeout = 3 * time.Second
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2015-02-10 22:49:45 +00:00
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type upnp struct {
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dev *goupnp.RootDevice
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service string
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client upnpClient
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}
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type upnpClient interface {
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GetExternalIPAddress() (string, error)
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AddPortMapping(string, uint16, string, uint16, string, bool, string, uint32) error
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DeletePortMapping(string, uint16, string) error
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GetNATRSIPStatus() (sip bool, nat bool, err error)
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}
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func (n *upnp) ExternalIP() (addr net.IP, err error) {
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ipString, err := n.client.GetExternalIPAddress()
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if err != nil {
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return nil, err
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}
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ip := net.ParseIP(ipString)
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if ip == nil {
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return nil, errors.New("bad IP in response")
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}
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return ip, nil
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}
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func (n *upnp) AddMapping(protocol string, extport, intport int, desc string, lifetime time.Duration) error {
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ip, err := n.internalAddress()
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if err != nil {
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return nil
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}
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protocol = strings.ToUpper(protocol)
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lifetimeS := uint32(lifetime / time.Second)
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return n.client.AddPortMapping("", uint16(extport), protocol, uint16(intport), ip.String(), true, desc, lifetimeS)
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}
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func (n *upnp) internalAddress() (net.IP, error) {
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devaddr, err := net.ResolveUDPAddr("udp4", n.dev.URLBase.Host)
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if err != nil {
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return nil, err
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}
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ifaces, err := net.Interfaces()
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if err != nil {
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return nil, err
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}
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for _, iface := range ifaces {
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addrs, err := iface.Addrs()
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if err != nil {
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return nil, err
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}
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for _, addr := range addrs {
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switch x := addr.(type) {
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case *net.IPNet:
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if x.Contains(devaddr.IP) {
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return x.IP, nil
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}
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}
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}
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}
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return nil, fmt.Errorf("could not find local address in same net as %v", devaddr)
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}
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func (n *upnp) DeleteMapping(protocol string, extport, intport int) error {
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return n.client.DeletePortMapping("", uint16(extport), strings.ToUpper(protocol))
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}
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func (n *upnp) String() string {
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return "UPNP " + n.service
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}
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// discoverUPnP searches for Internet Gateway Devices
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// and returns the first one it can find on the local network.
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func discoverUPnP() Interface {
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found := make(chan *upnp, 2)
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// IGDv1
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go discover(found, internetgateway1.URN_WANConnectionDevice_1, func(dev *goupnp.RootDevice, sc goupnp.ServiceClient) *upnp {
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switch sc.Service.ServiceType {
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case internetgateway1.URN_WANIPConnection_1:
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return &upnp{dev, "IGDv1-IP1", &internetgateway1.WANIPConnection1{sc}}
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case internetgateway1.URN_WANPPPConnection_1:
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return &upnp{dev, "IGDv1-PPP1", &internetgateway1.WANPPPConnection1{sc}}
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}
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return nil
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})
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// IGDv2
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go discover(found, internetgateway2.URN_WANConnectionDevice_2, func(dev *goupnp.RootDevice, sc goupnp.ServiceClient) *upnp {
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switch sc.Service.ServiceType {
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case internetgateway2.URN_WANIPConnection_1:
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return &upnp{dev, "IGDv2-IP1", &internetgateway2.WANIPConnection1{sc}}
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case internetgateway2.URN_WANIPConnection_2:
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return &upnp{dev, "IGDv2-IP2", &internetgateway2.WANIPConnection2{sc}}
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case internetgateway2.URN_WANPPPConnection_1:
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return &upnp{dev, "IGDv2-PPP1", &internetgateway2.WANPPPConnection1{sc}}
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}
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return nil
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})
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for i := 0; i < cap(found); i++ {
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if c := <-found; c != nil {
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return c
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}
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}
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return nil
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}
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func discover(out chan<- *upnp, target string, matcher func(*goupnp.RootDevice, goupnp.ServiceClient) *upnp) {
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devs, err := goupnp.DiscoverDevices(target)
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if err != nil {
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return
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}
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found := false
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for i := 0; i < len(devs) && !found; i++ {
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if devs[i].Root == nil {
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continue
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}
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devs[i].Root.Device.VisitServices(func(service *goupnp.Service) {
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if found {
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return
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}
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// check for a matching IGD service
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sc := goupnp.ServiceClient{service.NewSOAPClient(), devs[i].Root, service}
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2015-06-04 12:05:52 +00:00
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sc.SOAPClient.HTTPClient.Timeout = soapRequestTimeout
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2015-02-10 22:49:45 +00:00
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upnp := matcher(devs[i].Root, sc)
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if upnp == nil {
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return
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}
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// check whether port mapping is enabled
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if _, nat, err := upnp.client.GetNATRSIPStatus(); err != nil || !nat {
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return
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}
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out <- upnp
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found = true
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})
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}
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if !found {
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out <- nil
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}
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}
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