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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| package discover | ||
|
|
||
| import ( | ||
| "net" | ||
| "time" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common/mclock" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/ethereum/go-ethereum/p2p/enr" | ||
| "github.com/ethereum/go-ethereum/p2p/nat" | ||
| ) | ||
|
|
||
| const ( | ||
| portMapDuration = 10 * time.Minute | ||
| portMapRefreshInterval = 8 * time.Minute | ||
| portMapRetryInterval = 5 * time.Minute | ||
| extipRetryInterval = 2 * time.Minute | ||
| ) | ||
|
|
||
| type portMapping struct { | ||
| protocol string | ||
| name string | ||
| port int | ||
|
|
||
| // for use by the portMappingLoop goroutine: | ||
| extPort int // the mapped port returned by the NAT interface | ||
| nextTime mclock.AbsTime | ||
| } | ||
|
|
||
| // setupPortMapping starts the port mapping loop if necessary. | ||
| // Note: this needs to be called after the LocalNode instance has been set on the server. | ||
| func (p *PortalProtocol) setupPortMapping() { | ||
| // portMappingRegister will receive up to two values: one for the TCP port if | ||
| // listening is enabled, and one more for enabling UDP port mapping if discovery is | ||
| // enabled. We make it buffered to avoid blocking setup while a mapping request is in | ||
| // progress. | ||
| p.portMappingRegister = make(chan *portMapping, 2) | ||
|
|
||
| switch p.NAT.(type) { | ||
| case nil: | ||
| // No NAT interface configured. | ||
| go p.consumePortMappingRequests() | ||
|
|
||
| case nat.ExtIP: | ||
| // ExtIP doesn't block, set the IP right away. | ||
| ip, _ := p.NAT.ExternalIP() | ||
| p.localNode.SetStaticIP(ip) | ||
| go p.consumePortMappingRequests() | ||
|
|
||
| default: | ||
| go p.portMappingLoop() | ||
| } | ||
| } | ||
|
|
||
| func (p *PortalProtocol) consumePortMappingRequests() { | ||
| for { | ||
| select { | ||
| case <-p.closeCtx.Done(): | ||
| return | ||
| case <-p.portMappingRegister: | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // portMappingLoop manages port mappings for UDP and TCP. | ||
| func (p *PortalProtocol) portMappingLoop() { | ||
| newLogger := func(proto string, e int, i int) log.Logger { | ||
| return log.New("proto", proto, "extport", e, "intport", i, "interface", p.NAT) | ||
| } | ||
|
|
||
| var ( | ||
| mappings = make(map[string]*portMapping, 2) | ||
| refresh = mclock.NewAlarm(p.clock) | ||
| extip = mclock.NewAlarm(p.clock) | ||
| lastExtIP net.IP | ||
| ) | ||
| extip.Schedule(p.clock.Now()) | ||
| defer func() { | ||
| refresh.Stop() | ||
| extip.Stop() | ||
| for _, m := range mappings { | ||
| if m.extPort != 0 { | ||
| log := newLogger(m.protocol, m.extPort, m.port) | ||
| log.Debug("Deleting port mapping") | ||
| p.NAT.DeleteMapping(m.protocol, m.extPort, m.port) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| for { | ||
| // Schedule refresh of existing mappings. | ||
| for _, m := range mappings { | ||
| refresh.Schedule(m.nextTime) | ||
| } | ||
|
|
||
| select { | ||
| case <-p.closeCtx.Done(): | ||
| return | ||
|
|
||
| case <-extip.C(): | ||
| extip.Schedule(p.clock.Now().Add(extipRetryInterval)) | ||
| ip, err := p.NAT.ExternalIP() | ||
| if err != nil { | ||
| log.Debug("Couldn't get external IP", "err", err, "interface", p.NAT) | ||
| } else if !ip.Equal(lastExtIP) { | ||
| log.Debug("External IP changed", "ip", extip, "interface", p.NAT) | ||
| } else { | ||
| continue | ||
| } | ||
| // Here, we either failed to get the external IP, or it has changed. | ||
| lastExtIP = ip | ||
| p.localNode.SetStaticIP(ip) | ||
| p.Log.Debug("set static ip in nat", "ip", p.localNode.Node().IP().String()) | ||
| // Ensure port mappings are refreshed in case we have moved to a new network. | ||
| for _, m := range mappings { | ||
| m.nextTime = p.clock.Now() | ||
| } | ||
|
|
||
| case m := <-p.portMappingRegister: | ||
| if m.protocol != "TCP" && m.protocol != "UDP" { | ||
| panic("unknown NAT protocol name: " + m.protocol) | ||
| } | ||
| mappings[m.protocol] = m | ||
| m.nextTime = p.clock.Now() | ||
|
|
||
| case <-refresh.C(): | ||
| for _, m := range mappings { | ||
| if p.clock.Now() < m.nextTime { | ||
| continue | ||
| } | ||
|
|
||
| external := m.port | ||
| if m.extPort != 0 { | ||
| external = m.extPort | ||
| } | ||
| log := newLogger(m.protocol, external, m.port) | ||
|
|
||
| log.Trace("Attempting port mapping") | ||
| port, err := p.NAT.AddMapping(m.protocol, external, m.port, m.name, portMapDuration) | ||
| if err != nil { | ||
| log.Debug("Couldn't add port mapping", "err", err) | ||
| m.extPort = 0 | ||
| m.nextTime = p.clock.Now().Add(portMapRetryInterval) | ||
| continue | ||
| } | ||
| // It was mapped! | ||
| m.extPort = int(port) | ||
| m.nextTime = p.clock.Now().Add(portMapRefreshInterval) | ||
| if external != m.extPort { | ||
| log = newLogger(m.protocol, m.extPort, m.port) | ||
| log.Info("NAT mapped alternative port") | ||
| } else { | ||
| log.Info("NAT mapped port") | ||
| } | ||
|
|
||
| // Update port in local ENR. | ||
| switch m.protocol { | ||
| case "TCP": | ||
| p.localNode.Set(enr.TCP(m.extPort)) | ||
| case "UDP": | ||
| p.localNode.SetFallbackUDP(m.extPort) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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