mirror of https://github.com/poanetwork/gecko.git
116 lines
2.4 KiB
Go
116 lines
2.4 KiB
Go
package nat
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import (
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"fmt"
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"net"
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"sync"
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"time"
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"github.com/ava-labs/gecko/utils/logging"
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"github.com/ava-labs/gecko/utils/wrappers"
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)
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const (
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mapTimeout = 30 * time.Minute
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mapUpdate = mapTimeout / 2
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)
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type NATRouter interface {
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MapPort(protocol string, intport, extport uint16, desc string, duration time.Duration) error
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UnmapPort(protocol string, extport uint16) error
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ExternalIP() (net.IP, error)
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}
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func GetNATRouter() NATRouter {
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router := make(chan NATRouter)
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go func() {
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r := getUPnPRouter()
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if r != nil {
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fmt.Println("Found UPnP Router")
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router <- r
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} else {
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router <- nil
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}
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}()
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for i := 0; i < 1; i++ {
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if r := <-router; r != nil {
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return r
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}
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}
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return NewPublicIP()
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}
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type Router struct {
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log logging.Logger
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r NATRouter
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closer chan struct{}
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wg sync.WaitGroup
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errLock sync.Mutex
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errs wrappers.Errs
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}
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func NewRouter(log logging.Logger, r NATRouter) Router {
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return Router{
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log: log,
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r: r,
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closer: make(chan struct{}),
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}
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}
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func (dev *Router) Map(protocol string, intport, extport uint16, desc string) {
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dev.wg.Add(1)
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go dev.mapPort(protocol, intport, extport, desc)
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}
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func (dev *Router) mapPort(protocol string, intport, extport uint16, desc string) {
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updater := time.NewTimer(mapUpdate)
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defer func() {
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updater.Stop()
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dev.log.Info("Unmap protocol %s external port %d", protocol, extport)
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dev.errLock.Lock()
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dev.errs.Add(dev.r.UnmapPort(protocol, extport))
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dev.errLock.Unlock()
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dev.wg.Done()
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}()
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if err := dev.r.MapPort(protocol, intport, extport, desc, mapTimeout); err != nil {
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dev.log.Error("Map port failed. Protocol %s Internal %d External %d. %s",
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protocol, intport, extport, err)
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dev.errLock.Lock()
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dev.errs.Add(err)
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dev.errLock.Unlock()
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} else {
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dev.log.Info("Mapped Protocol %s Internal %d External %d.", protocol,
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intport, extport)
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}
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for {
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select {
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case <-updater.C:
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if err := dev.r.MapPort(protocol, intport, extport, desc, mapTimeout); err != nil {
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dev.log.Error("Renew port mapping failed. Protocol %s Internal %d External %d. %s",
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protocol, intport, extport, err)
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} else {
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dev.log.Info("Renew port mapping Protocol %s Internal %d External %d.", protocol,
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intport, extport)
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}
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updater.Reset(mapUpdate)
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case _, _ = <-dev.closer:
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return
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}
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}
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}
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func (dev *Router) UnmapAllPorts() error {
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close(dev.closer)
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dev.wg.Wait()
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dev.log.Info("Unmapped all ports")
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return dev.errs.Err
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}
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