p2p/nat: new package for port mapping stuff
I have verified that UPnP and NAT-PMP work against an older version of the MiniUPnP daemon running on pfSense. This code is kind of hard to test automatically.
This commit is contained in:
Felix Lange
parent
4242b05462
commit
1543833ca0
235
p2p/nat/nat.go
Normal file
235
p2p/nat/nat.go
Normal file
@ -0,0 +1,235 @@
|
||||
// Package nat provides access to common port mapping protocols.
|
||||
package nat
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"net"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/ethereum/go-ethereum/logger"
|
||||
"github.com/jackpal/go-nat-pmp"
|
||||
)
|
||||
|
||||
var log = logger.NewLogger("P2P NAT")
|
||||
|
||||
// An implementation of nat.Interface can map local ports to ports
|
||||
// accessible from the Internet.
|
||||
type Interface interface {
|
||||
// These methods manage a mapping between a port on the local
|
||||
// machine to a port that can be connected to from the internet.
|
||||
//
|
||||
// protocol is "UDP" or "TCP". Some implementations allow setting
|
||||
// a display name for the mapping. The mapping may be removed by
|
||||
// the gateway when its lifetime ends.
|
||||
AddMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error
|
||||
DeleteMapping(protocol string, extport, intport int) error
|
||||
|
||||
// This method should return the external (Internet-facing)
|
||||
// address of the gateway device.
|
||||
ExternalIP() (net.IP, error)
|
||||
|
||||
// Should return name of the method. This is used for logging.
|
||||
String() string
|
||||
}
|
||||
|
||||
// Parse parses a NAT interface description.
|
||||
// The following formats are currently accepted.
|
||||
// Note that mechanism names are not case-sensitive.
|
||||
//
|
||||
// "" or "none" return nil
|
||||
// "extip:77.12.33.4" will assume the local machine is reachable on the given IP
|
||||
// "any" uses the first auto-detected mechanism
|
||||
// "upnp" uses the Universal Plug and Play protocol
|
||||
// "pmp" uses NAT-PMP with an auto-detected gateway address
|
||||
// "pmp:192.168.0.1" uses NAT-PMP with the given gateway address
|
||||
func Parse(spec string) (Interface, error) {
|
||||
var (
|
||||
parts = strings.SplitN(spec, ":", 2)
|
||||
mech = strings.ToLower(parts[0])
|
||||
ip net.IP
|
||||
)
|
||||
if len(parts) > 1 {
|
||||
ip = net.ParseIP(parts[1])
|
||||
if ip == nil {
|
||||
return nil, errors.New("invalid IP address")
|
||||
}
|
||||
}
|
||||
switch mech {
|
||||
case "", "none", "off":
|
||||
return nil, nil
|
||||
case "any", "auto", "on":
|
||||
return Any(), nil
|
||||
case "extip", "ip":
|
||||
if ip == nil {
|
||||
return nil, errors.New("missing IP address")
|
||||
}
|
||||
return ExtIP(ip), nil
|
||||
case "upnp":
|
||||
return UPnP(), nil
|
||||
case "pmp", "natpmp", "nat-pmp":
|
||||
return PMP(ip), nil
|
||||
default:
|
||||
return nil, fmt.Errorf("unknown mechanism %q", parts[0])
|
||||
}
|
||||
}
|
||||
|
||||
const (
|
||||
mapTimeout = 20 * time.Minute
|
||||
mapUpdateInterval = 15 * time.Minute
|
||||
)
|
||||
|
||||
// Map adds a port mapping on m and keeps it alive until c is closed.
|
||||
// This function is typically invoked in its own goroutine.
|
||||
func Map(m Interface, c chan struct{}, protocol string, extport, intport int, name string) {
|
||||
refresh := time.NewTimer(mapUpdateInterval)
|
||||
defer func() {
|
||||
refresh.Stop()
|
||||
log.Debugf("Deleting port mapping: %s %d -> %d (%s) using %s\n", protocol, extport, intport, name, m)
|
||||
m.DeleteMapping(protocol, extport, intport)
|
||||
}()
|
||||
log.Debugf("add mapping: %s %d -> %d (%s) using %s\n", protocol, extport, intport, name, m)
|
||||
if err := m.AddMapping(protocol, intport, extport, name, mapTimeout); err != nil {
|
||||
log.Errorf("mapping error: %v\n", err)
|
||||
}
|
||||
for {
|
||||
select {
|
||||
case _, ok := <-c:
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
case <-refresh.C:
|
||||
log.DebugDetailf("refresh mapping: %s %d -> %d (%s) using %s\n", protocol, extport, intport, name, m)
|
||||
if err := m.AddMapping(protocol, intport, extport, name, mapTimeout); err != nil {
|
||||
log.Errorf("mapping error: %v\n", err)
|
||||
}
|
||||
refresh.Reset(mapUpdateInterval)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ExtIP assumes that the local machine is reachable on the given
|
||||
// external IP address, and that any required ports were mapped manually.
|
||||
// Mapping operations will not return an error but won't actually do anything.
|
||||
func ExtIP(ip net.IP) Interface {
|
||||
if ip == nil {
|
||||
panic("IP must not be nil")
|
||||
}
|
||||
return extIP(ip)
|
||||
}
|
||||
|
||||
type extIP net.IP
|
||||
|
||||
func (n extIP) ExternalIP() (net.IP, error) { return net.IP(n), nil }
|
||||
func (n extIP) String() string { return fmt.Sprintf("ExtIP(%v)", net.IP(n)) }
|
||||
|
||||
// These do nothing.
|
||||
func (extIP) AddMapping(string, int, int, string, time.Duration) error { return nil }
|
||||
func (extIP) DeleteMapping(string, int, int) error { return nil }
|
||||
|
||||
// Any returns a port mapper that tries to discover any supported
|
||||
// mechanism on the local network.
|
||||
func Any() Interface {
|
||||
// TODO: attempt to discover whether the local machine has an
|
||||
// Internet-class address. Return ExtIP in this case.
|
||||
return startautodisc("UPnP or NAT-PMP", func() Interface {
|
||||
found := make(chan Interface, 2)
|
||||
go func() { found <- discoverUPnP() }()
|
||||
go func() { found <- discoverPMP() }()
|
||||
for i := 0; i < cap(found); i++ {
|
||||
if c := <-found; c != nil {
|
||||
return c
|
||||
}
|
||||
}
|
||||
return nil
|
||||
})
|
||||
}
|
||||
|
||||
// UPnP returns a port mapper that uses UPnP. It will attempt to
|
||||
// discover the address of your router using UDP broadcasts.
|
||||
func UPnP() Interface {
|
||||
return startautodisc("UPnP", discoverUPnP)
|
||||
}
|
||||
|
||||
// PMP returns a port mapper that uses NAT-PMP. The provided gateway
|
||||
// address should be the IP of your router. If the given gateway
|
||||
// address is nil, PMP will attempt to auto-discover the router.
|
||||
func PMP(gateway net.IP) Interface {
|
||||
if gateway != nil {
|
||||
return &pmp{gw: gateway, c: natpmp.NewClient(gateway)}
|
||||
}
|
||||
return startautodisc("NAT-PMP", discoverPMP)
|
||||
}
|
||||
|
||||
// autodisc represents a port mapping mechanism that is still being
|
||||
// auto-discovered. Calls to the Interface methods on this type will
|
||||
// wait until the discovery is done and then call the method on the
|
||||
// discovered mechanism.
|
||||
//
|
||||
// This type is useful because discovery can take a while but we
|
||||
// want return an Interface value from UPnP, PMP and Auto immediately.
|
||||
type autodisc struct {
|
||||
what string
|
||||
done <-chan Interface
|
||||
|
||||
mu sync.Mutex
|
||||
found Interface
|
||||
}
|
||||
|
||||
func startautodisc(what string, doit func() Interface) Interface {
|
||||
// TODO: monitor network configuration and rerun doit when it changes.
|
||||
done := make(chan Interface)
|
||||
ad := &autodisc{what: what, done: done}
|
||||
go func() { done <- doit(); close(done) }()
|
||||
return ad
|
||||
}
|
||||
|
||||
func (n *autodisc) AddMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error {
|
||||
if err := n.wait(); err != nil {
|
||||
return err
|
||||
}
|
||||
return n.found.AddMapping(protocol, extport, intport, name, lifetime)
|
||||
}
|
||||
|
||||
func (n *autodisc) DeleteMapping(protocol string, extport, intport int) error {
|
||||
if err := n.wait(); err != nil {
|
||||
return err
|
||||
}
|
||||
return n.found.DeleteMapping(protocol, extport, intport)
|
||||
}
|
||||
|
||||
func (n *autodisc) ExternalIP() (net.IP, error) {
|
||||
if err := n.wait(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return n.found.ExternalIP()
|
||||
}
|
||||
|
||||
func (n *autodisc) String() string {
|
||||
n.mu.Lock()
|
||||
defer n.mu.Unlock()
|
||||
if n.found == nil {
|
||||
return n.what
|
||||
} else {
|
||||
return n.found.String()
|
||||
}
|
||||
}
|
||||
|
||||
func (n *autodisc) wait() error {
|
||||
n.mu.Lock()
|
||||
found := n.found
|
||||
n.mu.Unlock()
|
||||
if found != nil {
|
||||
// already discovered
|
||||
return nil
|
||||
}
|
||||
if found = <-n.done; found == nil {
|
||||
return errors.New("no devices discovered")
|
||||
}
|
||||
n.mu.Lock()
|
||||
n.found = found
|
||||
n.mu.Unlock()
|
||||
return nil
|
||||
}
|
||||
115
p2p/nat/natpmp.go
Normal file
115
p2p/nat/natpmp.go
Normal file
@ -0,0 +1,115 @@
|
||||
package nat
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"github.com/jackpal/go-nat-pmp"
|
||||
)
|
||||
|
||||
// natPMPClient adapts the NAT-PMP protocol implementation so it conforms to
|
||||
// the common interface.
|
||||
type pmp struct {
|
||||
gw net.IP
|
||||
c *natpmp.Client
|
||||
}
|
||||
|
||||
func (n *pmp) String() string {
|
||||
return fmt.Sprintf("NAT-PMP(%v)", n.gw)
|
||||
}
|
||||
|
||||
func (n *pmp) ExternalIP() (net.IP, error) {
|
||||
response, err := n.c.GetExternalAddress()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return response.ExternalIPAddress[:], nil
|
||||
}
|
||||
|
||||
func (n *pmp) AddMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error {
|
||||
if lifetime <= 0 {
|
||||
return fmt.Errorf("lifetime must not be <= 0")
|
||||
}
|
||||
// Note order of port arguments is switched between our
|
||||
// AddMapping and the client's AddPortMapping.
|
||||
_, err := n.c.AddPortMapping(strings.ToLower(protocol), intport, extport, int(lifetime/time.Second))
|
||||
return err
|
||||
}
|
||||
|
||||
func (n *pmp) DeleteMapping(protocol string, extport, intport 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.c.AddPortMapping(strings.ToLower(protocol), intport, 0, 0)
|
||||
return err
|
||||
}
|
||||
|
||||
func discoverPMP() Interface {
|
||||
// run external address lookups on all potential gateways
|
||||
gws := potentialGateways()
|
||||
found := make(chan *pmp, len(gws))
|
||||
for i := range gws {
|
||||
gw := gws[i]
|
||||
go func() {
|
||||
c := natpmp.NewClient(gw)
|
||||
if _, err := c.GetExternalAddress(); err != nil {
|
||||
found <- nil
|
||||
} else {
|
||||
found <- &pmp{gw, c}
|
||||
}
|
||||
}()
|
||||
}
|
||||
// return the one that responds first.
|
||||
// discovery needs to be quick, so we stop caring about
|
||||
// any responses after a very short timeout.
|
||||
timeout := time.NewTimer(1 * time.Second)
|
||||
defer timeout.Stop()
|
||||
for _ = range gws {
|
||||
select {
|
||||
case c := <-found:
|
||||
if c != nil {
|
||||
return c
|
||||
}
|
||||
case <-timeout.C:
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
var (
|
||||
// LAN IP ranges
|
||||
_, lan10, _ = net.ParseCIDR("10.0.0.0/8")
|
||||
_, lan176, _ = net.ParseCIDR("172.16.0.0/12")
|
||||
_, lan192, _ = net.ParseCIDR("192.168.0.0/16")
|
||||
)
|
||||
|
||||
// TODO: improve this. We currently assume that (on most networks)
|
||||
// the router is X.X.X.1 in a local LAN range.
|
||||
func potentialGateways() (gws []net.IP) {
|
||||
ifaces, err := net.Interfaces()
|
||||
if err != nil {
|
||||
return nil
|
||||
}
|
||||
for _, iface := range ifaces {
|
||||
ifaddrs, err := iface.Addrs()
|
||||
if err != nil {
|
||||
return gws
|
||||
}
|
||||
for _, addr := range ifaddrs {
|
||||
switch x := addr.(type) {
|
||||
case *net.IPNet:
|
||||
if lan10.Contains(x.IP) || lan176.Contains(x.IP) || lan192.Contains(x.IP) {
|
||||
ip := x.IP.Mask(x.Mask).To4()
|
||||
if ip != nil {
|
||||
ip[3] = ip[3] | 0x01
|
||||
gws = append(gws, ip)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return gws
|
||||
}
|
||||
149
p2p/nat/natupnp.go
Normal file
149
p2p/nat/natupnp.go
Normal file
@ -0,0 +1,149 @@
|
||||
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
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user