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package nat
import (
"errors"
"fmt"
"net"
"strings"
"time"
"github.com/fjl/goupnp"
"github.com/fjl/goupnp/dcps/internetgateway1"
"github.com/fjl/goupnp/dcps/internetgateway2"
)
type upnp struct {
dev *goupnp.RootDevice
service string
client upnpClient
}
type upnpClient interface {
GetExternalIPAddress() (string, error)
AddPortMapping(string, uint16, string, uint16, string, bool, string, uint32) error
DeletePortMapping(string, uint16, string) error
GetNATRSIPStatus() (sip bool, nat bool, err error)
}
func (n *upnp) ExternalIP() (addr net.IP, err error) {
ipString, err := n.client.GetExternalIPAddress()
if err != nil {
return nil, err
}
ip := net.ParseIP(ipString)
if ip == nil {
return nil, errors.New("bad IP in response")
}
return ip, nil
}
func (n *upnp) AddMapping(protocol string, extport, intport int, desc string, lifetime time.Duration) error {
ip, err := n.internalAddress()
if err != nil {
return nil
}
protocol = strings.ToUpper(protocol)
lifetimeS := uint32(lifetime / time.Second)
return n.client.AddPortMapping("", uint16(extport), protocol, uint16(intport), ip.String(), true, desc, lifetimeS)
}
func (n *upnp) internalAddress() (net.IP, error) {
devaddr, err := net.ResolveUDPAddr("udp4", n.dev.URLBase.Host)
if err != nil {
return nil, err
}
ifaces, err := net.Interfaces()
if err != nil {
return nil, err
}
for _, iface := range ifaces {
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, addr := range addrs {
switch x := addr.(type) {
case *net.IPNet:
if x.Contains(devaddr.IP) {
return x.IP, nil
}
}
}
}
return nil, fmt.Errorf("could not find local address in same net as %v", devaddr)
}
func (n *upnp) DeleteMapping(protocol string, extport, intport int) error {
return n.client.DeletePortMapping("", uint16(extport), strings.ToUpper(protocol))
}
func (n *upnp) String() string {
return "UPNP " + n.service
}
// discoverUPnP searches for Internet Gateway Devices
// and returns the first one it can find on the local network.
func discoverUPnP() Interface {
found := make(chan *upnp, 2)
// IGDv1
go discover(found, internetgateway1.URN_WANConnectionDevice_1, func(dev *goupnp.RootDevice, sc goupnp.ServiceClient) *upnp {
switch sc.Service.ServiceType {
case internetgateway1.URN_WANIPConnection_1:
return &upnp{dev, "IGDv1-IP1", &internetgateway1.WANIPConnection1{sc}}
case internetgateway1.URN_WANPPPConnection_1:
return &upnp{dev, "IGDv1-PPP1", &internetgateway1.WANPPPConnection1{sc}}
}
return nil
})
// IGDv2
go discover(found, internetgateway2.URN_WANConnectionDevice_2, func(dev *goupnp.RootDevice, sc goupnp.ServiceClient) *upnp {
switch sc.Service.ServiceType {
case internetgateway2.URN_WANIPConnection_1:
return &upnp{dev, "IGDv2-IP1", &internetgateway2.WANIPConnection1{sc}}
case internetgateway2.URN_WANIPConnection_2:
return &upnp{dev, "IGDv2-IP2", &internetgateway2.WANIPConnection2{sc}}
case internetgateway2.URN_WANPPPConnection_1:
return &upnp{dev, "IGDv2-PPP1", &internetgateway2.WANPPPConnection1{sc}}
}
return nil
})
for i := 0; i < cap(found); i++ {
if c := <-found; c != nil {
return c
}
}
return nil
}
func discover(out chan<- *upnp, target string, matcher func(*goupnp.RootDevice, goupnp.ServiceClient) *upnp) {
devs, err := goupnp.DiscoverDevices(target)
if err != nil {
return
}
found := false
for i := 0; i < len(devs) && !found; i++ {
if devs[i].Root == nil {
continue
}
devs[i].Root.Device.VisitServices(func(service *goupnp.Service) {
if found {
return
}
// check for a matching IGD service
sc := goupnp.ServiceClient{service.NewSOAPClient(), devs[i].Root, service}
upnp := matcher(devs[i].Root, sc)
if upnp == nil {
return
}
// check whether port mapping is enabled
if _, nat, err := upnp.client.GetNATRSIPStatus(); err != nil || !nat {
return
}
out <- upnp
found = true
})
}
if !found {
out <- nil
}
}
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