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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package flow | ||
|
|
||
| import ( | ||
| "os" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/massix/protrans/pkg/nat" | ||
| "github.com/massix/protrans/pkg/transmission" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| func FetchExternalIP(natClient nat.NatClientI, wg *sync.WaitGroup, ipChan chan<- string, done chan os.Signal) { | ||
| running := true | ||
|
|
||
| for running { | ||
| ip, err := nat.GetExternalIP(natClient) | ||
| if err != nil { | ||
| logrus.Warn(err) | ||
| } else { | ||
| logrus.Debugf("Retrieved IP: %s, sending to channel", ip) | ||
| ipChan <- ip | ||
| } | ||
|
|
||
| select { | ||
| case s := <-done: | ||
| logrus.Info("Gracefully stopping gateway detector") | ||
| running = false | ||
| done <- s // Make sure everyone is leaving | ||
| case <-time.After(30 * time.Second): | ||
| logrus.Debug("No signals received in 30 seconds, refreshing IP...") | ||
| } | ||
| } | ||
|
|
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| wg.Done() | ||
| } | ||
|
|
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| func MapPorts(natClient nat.NatClientI, portLifetime int, wg *sync.WaitGroup, ipChan <-chan string, portChan chan<- int, done chan os.Signal) { | ||
| running := true | ||
|
|
||
| for running { | ||
| select { | ||
| case ip := <-ipChan: | ||
| var mappedTcpPort int | ||
| var mappedUdpPort int | ||
| var err error | ||
| logrus.Debugf("Mapping port for external IP: %s", ip) | ||
|
|
||
| mappedTcpPort, err = nat.AddPortMapping(natClient, "tcp", portLifetime) | ||
| if err != nil { | ||
| logrus.Errorf("Unable to create port mapping: %s", err) | ||
| continue | ||
| } | ||
|
|
||
| mappedUdpPort, err = nat.AddPortMapping(natClient, "udp", portLifetime) | ||
| if err != nil { | ||
| logrus.Errorf("Unable to create port mapping: %s", err) | ||
| continue | ||
| } | ||
|
|
||
| if mappedTcpPort != mappedUdpPort { | ||
| logrus.Errorf("Ports differ in range: (tcp %d) and (udp %d)", mappedTcpPort, mappedUdpPort) | ||
| continue | ||
| } | ||
|
|
||
| logrus.Debugf("Sending port %d to channel", mappedTcpPort) | ||
| portChan <- mappedTcpPort | ||
| case s := <-done: | ||
| logrus.Info("Gracefully stopping port mapper") | ||
| running = false | ||
| done <- s | ||
| } | ||
| } | ||
|
|
||
| wg.Done() | ||
| } | ||
|
|
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| func TransmissionArgSetter(transmissionClient transmission.TransmissionClient, wg *sync.WaitGroup, portChan <-chan int, done chan os.Signal) { | ||
| running := true | ||
|
|
||
| for running { | ||
| select { | ||
| case mappedPort := <-portChan: | ||
| if transmission.IsConnected(transmissionClient) { | ||
| logrus.Debug("Transmission is connected") | ||
| if transmission.IsPortOpen(transmissionClient) { | ||
| logrus.Debug("Port is already set in Transmission, nothing to do") | ||
| continue | ||
| } | ||
|
|
||
| if err := transmission.SetPeerPort(transmissionClient, mappedPort); err != nil { | ||
| logrus.Error(err) | ||
| continue | ||
| } | ||
|
|
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| logrus.Debug("Port set!") | ||
| time.Sleep(3 * time.Second) | ||
|
|
||
| if transmission.IsPortOpen(transmissionClient) { | ||
| logrus.Infof("Successfully set port %d to Transmission and checked network connectivity", mappedPort) | ||
| } else { | ||
| logrus.Warnf("Set port %d to Transmission but was unable to check connectivity (this may be normal, it might take some time before the NAT is recognised)", mappedPort) | ||
| } | ||
| } else { | ||
| logrus.Warnf("Should set port: %d but Transmission is not connected", mappedPort) | ||
| } | ||
| case s := <-done: | ||
| logrus.Info("Gracefully stopping Transmission Client") | ||
| running = false | ||
| done <- s | ||
| } | ||
| } | ||
|
|
||
| wg.Done() | ||
| } |
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