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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package server | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "net" | ||
| "time" | ||
|
|
||
| "github.com/JackalLabs/jackal-provider/jprov/types" | ||
| "github.com/huin/goupnp/dcps/internetgateway2" | ||
| "golang.org/x/sync/errgroup" | ||
| ) | ||
|
|
||
| func GetLocalIP() string { | ||
| addrs, err := net.InterfaceAddrs() | ||
| if err != nil { | ||
| return "" | ||
| } | ||
| for _, address := range addrs { | ||
| // check the address type and if it is not a loopback the display it | ||
| if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() { | ||
| if ipnet.IP.To4() != nil { | ||
| return ipnet.IP.String() | ||
| } | ||
| } | ||
| } | ||
| return "" | ||
| } | ||
|
|
||
| type RouterClient interface { | ||
| AddPortMapping( | ||
| NewRemoteHost string, | ||
| NewExternalPort uint16, | ||
| NewProtocol string, | ||
| NewInternalPort uint16, | ||
| NewInternalClient string, | ||
| NewEnabled bool, | ||
| NewPortMappingDescription string, | ||
| NewLeaseDuration uint32, | ||
| ) (err error) | ||
|
|
||
| GetExternalIPAddress() ( | ||
| NewExternalIPAddress string, | ||
| err error, | ||
| ) | ||
| } | ||
|
|
||
| func PickRouterClient(ctx context.Context) (RouterClient, error) { | ||
| tasks, _ := errgroup.WithContext(ctx) | ||
| // Request each type of client in parallel, and return what is found. | ||
| var ip1Clients []*internetgateway2.WANIPConnection1 | ||
| tasks.Go(func() error { | ||
| var err error | ||
| ip1Clients, _, err = internetgateway2.NewWANIPConnection1Clients() | ||
| return err | ||
| }) | ||
| var ip2Clients []*internetgateway2.WANIPConnection2 | ||
| tasks.Go(func() error { | ||
| var err error | ||
| ip2Clients, _, err = internetgateway2.NewWANIPConnection2Clients() | ||
| return err | ||
| }) | ||
| var ppp1Clients []*internetgateway2.WANPPPConnection1 | ||
| tasks.Go(func() error { | ||
| var err error | ||
| ppp1Clients, _, err = internetgateway2.NewWANPPPConnection1Clients() | ||
| return err | ||
| }) | ||
|
|
||
| if err := tasks.Wait(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Trivial handling for where we find exactly one device to talk to, you | ||
| // might want to provide more flexible handling than this if multiple | ||
| // devices are found. | ||
| switch { | ||
| case len(ip2Clients) == 1: | ||
| return ip2Clients[0], nil | ||
| case len(ip1Clients) == 1: | ||
| return ip1Clients[0], nil | ||
| case len(ppp1Clients) == 1: | ||
| return ppp1Clients[0], nil | ||
| default: | ||
| return nil, errors.New("multiple or no services found") | ||
| } | ||
| } | ||
|
|
||
| func NatCycle(ctx context.Context) { | ||
| for { | ||
|
|
||
| ip := GetLocalIP() | ||
| err := GetIPAndForwardPort(ctx, ip) | ||
| if err != nil { | ||
| fmt.Println(err) | ||
| } | ||
|
|
||
| time.Sleep(time.Second * 3600) | ||
|
|
||
| } | ||
| } | ||
|
|
||
| func GetIPAndForwardPort(ctx context.Context, internalIp string) error { | ||
| client, err := PickRouterClient(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| _, err = client.GetExternalIPAddress() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return client.AddPortMapping( | ||
| "", | ||
| // External port number to expose to Internet: | ||
| 3333, | ||
| // Forward TCP (this could be "UDP" if we wanted that instead). | ||
| "TCP", | ||
| // Internal port number on the LAN to forward to. | ||
| // Some routers might not support this being different to the external | ||
| // port number. | ||
| 3333, | ||
| // Internal address on the LAN we want to forward to. | ||
| internalIp, | ||
| // Enabled: | ||
| true, | ||
| // Informational description for the client requesting the port forwarding. | ||
| types.AppName, | ||
| // How long should the port forward last for in seconds. | ||
| // If you want to keep it open for longer and potentially across router | ||
| // resets, you might want to periodically request before this elapses. | ||
| 3600, | ||
| ) | ||
| } |
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