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@ -25,15 +25,47 @@ import (
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"sync/atomic"
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"time"
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"github.com/tailscale/goupnp"
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"github.com/tailscale/goupnp/dcps/internetgateway2"
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"github.com/tailscale/goupnp/soap"
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"github.com/huin/goupnp"
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"github.com/huin/goupnp/dcps/internetgateway2"
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"github.com/huin/goupnp/soap"
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"tailscale.com/envknob"
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"tailscale.com/net/netns"
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"tailscale.com/types/logger"
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"tailscale.com/util/ctxkey"
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"tailscale.com/util/mak"
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)
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// upnpHTTPClientKey is a context key for storing an HTTP client to use
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// for UPnP requests. This allows us to use a custom HTTP client (with custom
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// dialer, timeouts, etc.) while using the upstream goupnp library which only
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// supports a global HTTPClientDefault.
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var upnpHTTPClientKey = ctxkey.New[*http.Client]("portmapper.upnpHTTPClient", nil)
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// delegatingRoundTripper implements http.RoundTripper by delegating to
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// the HTTP client stored in the request's context. This allows us to use
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// per-request HTTP client configuration with the upstream goupnp library.
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type delegatingRoundTripper struct {
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inner *http.Client
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}
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func (d delegatingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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if c := upnpHTTPClientKey.Value(req.Context()); c != nil {
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return c.Transport.RoundTrip(req)
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}
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return d.inner.Do(req)
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}
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func init() {
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// The upstream goupnp library uses a global HTTP client for all
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// requests, while we want to be able to use a per-Client
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// [http.Client]. We replace its global HTTP client with one that
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// delegates to the HTTP client stored in the request's context.
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old := goupnp.HTTPClientDefault
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goupnp.HTTPClientDefault = &http.Client{
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Transport: delegatingRoundTripper{old},
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}
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}
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// References:
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//
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// WANIP Connection v2: http://upnp.org/specs/gw/UPnP-gw-WANIPConnection-v2-Service.pdf
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@ -79,14 +111,17 @@ func (u *upnpMapping) MappingDebug() string {
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u.loc)
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}
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func (u *upnpMapping) Release(ctx context.Context) {
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u.client.DeletePortMapping(ctx, "", u.external.Port(), upnpProtocolUDP)
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u.client.DeletePortMappingCtx(ctx, "", u.external.Port(), upnpProtocolUDP)
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}
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// upnpClient is an interface over the multiple different clients exported by goupnp,
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// exposing the functions we need for portmapping. Those clients are auto-generated from XML-specs,
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// which is why they're not very idiomatic.
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//
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// The method names use the *Ctx suffix to match the upstream goupnp library's convention
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// for context-aware methods.
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type upnpClient interface {
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AddPortMapping(
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AddPortMappingCtx(
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ctx context.Context,
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// remoteHost is the remote device sending packets to this device, in the format of x.x.x.x.
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@ -119,9 +154,9 @@ type upnpClient interface {
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leaseDurationSec uint32,
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) error
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DeletePortMapping(ctx context.Context, remoteHost string, externalPort uint16, protocol string) error
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GetExternalIPAddress(ctx context.Context) (externalIPAddress string, err error)
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GetStatusInfo(ctx context.Context) (status string, lastConnError string, uptime uint32, err error)
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DeletePortMappingCtx(ctx context.Context, remoteHost string, externalPort uint16, protocol string) error
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GetExternalIPAddressCtx(ctx context.Context) (externalIPAddress string, err error)
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GetStatusInfoCtx(ctx context.Context) (status string, lastConnError string, uptime uint32, err error)
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}
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// tsPortMappingDesc gets sent to UPnP clients as a human-readable label for the portmapping.
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@ -171,7 +206,7 @@ func addAnyPortMapping(
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// First off, try using AddAnyPortMapping; if there's a conflict, the
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// router will pick another port and return it.
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if upnp, ok := upnp.(*internetgateway2.WANIPConnection2); ok {
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return upnp.AddAnyPortMapping(
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return upnp.AddAnyPortMappingCtx(
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ctx,
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"",
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externalPort,
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@ -186,7 +221,7 @@ func addAnyPortMapping(
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// Fall back to using AddPortMapping, which requests a mapping to/from
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// a specific external port.
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err = upnp.AddPortMapping(
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err = upnp.AddPortMappingCtx(
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ctx,
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"",
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externalPort,
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@ -244,7 +279,7 @@ func getUPnPRootDevice(ctx context.Context, logf logger.Logf, debug DebugKnobs,
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defer cancel()
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// This part does a network fetch.
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root, err := goupnp.DeviceByURL(ctx, u)
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root, err := goupnp.DeviceByURLCtx(ctx, u)
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if err != nil {
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return nil, nil, err
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}
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@ -257,8 +292,7 @@ func getUPnPRootDevice(ctx context.Context, logf logger.Logf, debug DebugKnobs,
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//
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// loc is the parsed location that was used to fetch the given RootDevice.
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//
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// The provided ctx is not retained in the returned upnpClient, but
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// its associated HTTP client is (if set via goupnp.WithHTTPClient).
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// The provided ctx is not retained in the returned upnpClient.
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func selectBestService(ctx context.Context, logf logger.Logf, root *goupnp.RootDevice, loc *url.URL) (client upnpClient, err error) {
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method := "none"
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defer func() {
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@ -274,9 +308,9 @@ func selectBestService(ctx context.Context, logf logger.Logf, root *goupnp.RootD
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// First, get all available clients from the device, and append to our
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// list of possible clients. Order matters here; we want to prefer
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// WANIPConnection2 over WANIPConnection1 or WANPPPConnection.
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wanIP2, _ := internetgateway2.NewWANIPConnection2ClientsFromRootDevice(ctx, root, loc)
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wanIP1, _ := internetgateway2.NewWANIPConnection1ClientsFromRootDevice(ctx, root, loc)
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wanPPP, _ := internetgateway2.NewWANPPPConnection1ClientsFromRootDevice(ctx, root, loc)
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wanIP2, _ := internetgateway2.NewWANIPConnection2ClientsFromRootDevice(root, loc)
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wanIP1, _ := internetgateway2.NewWANIPConnection1ClientsFromRootDevice(root, loc)
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wanPPP, _ := internetgateway2.NewWANPPPConnection1ClientsFromRootDevice(root, loc)
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var clients []upnpClient
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for _, v := range wanIP2 {
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@ -291,12 +325,12 @@ func selectBestService(ctx context.Context, logf logger.Logf, root *goupnp.RootD
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// These are legacy services that were deprecated in 2015, but are
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// still in use by older devices; try them just in case.
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legacyClients, _ := goupnp.NewServiceClientsFromRootDevice(ctx, root, loc, urn_LegacyWANPPPConnection_1)
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legacyClients, _ := goupnp.NewServiceClientsFromRootDevice(root, loc, urn_LegacyWANPPPConnection_1)
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metricUPnPSelectLegacy.Add(int64(len(legacyClients)))
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for _, client := range legacyClients {
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clients = append(clients, &legacyWANPPPConnection1{client})
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}
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legacyClients, _ = goupnp.NewServiceClientsFromRootDevice(ctx, root, loc, urn_LegacyWANIPConnection_1)
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legacyClients, _ = goupnp.NewServiceClientsFromRootDevice(root, loc, urn_LegacyWANIPConnection_1)
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metricUPnPSelectLegacy.Add(int64(len(legacyClients)))
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for _, client := range legacyClients {
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clients = append(clients, &legacyWANIPConnection1{client})
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@ -346,7 +380,7 @@ func selectBestService(ctx context.Context, logf logger.Logf, root *goupnp.RootD
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}
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// Check if the device has an external IP address.
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extIP, err := svc.GetExternalIPAddress(ctx)
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extIP, err := svc.GetExternalIPAddressCtx(ctx)
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if err != nil {
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continue
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}
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@ -399,7 +433,7 @@ func selectBestService(ctx context.Context, logf logger.Logf, root *goupnp.RootD
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// serviceIsConnected returns whether a given UPnP service is connected, based
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// on the NewConnectionStatus field returned from GetStatusInfo.
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func serviceIsConnected(ctx context.Context, logf logger.Logf, svc upnpClient) bool {
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status, _ /* NewLastConnectionError */, _ /* NewUptime */, err := svc.GetStatusInfo(ctx)
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status, _ /* NewLastConnectionError */, _ /* NewUptime */, err := svc.GetStatusInfoCtx(ctx)
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if err != nil {
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return false
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}
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@ -454,7 +488,7 @@ func (c *Client) getUPnPPortMapping(
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c.mu.Lock()
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oldMapping, ok := c.mapping.(*upnpMapping)
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metas := c.uPnPMetas
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ctx = goupnp.WithHTTPClient(ctx, c.upnpHTTPClientLocked())
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ctx = upnpHTTPClientKey.WithValue(ctx, c.upnpHTTPClientLocked())
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c.mu.Unlock()
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// Wrapper for a uPnPDiscoResponse with an optional existing root
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@ -629,7 +663,7 @@ func (c *Client) tryUPnPPortmapWithDevice(
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}
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// TODO cache this ip somewhere?
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extIP, err := client.GetExternalIPAddress(ctx)
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extIP, err := client.GetExternalIPAddressCtx(ctx)
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c.vlogf("client.GetExternalIPAddress: %v, %v", extIP, err)
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if err != nil {
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return netip.AddrPort{}, nil, err
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Andrew Dunham
3 weeks ago
committed by