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@ -14,6 +14,7 @@ import (
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"io"
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"io"
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"io/ioutil"
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"io/ioutil"
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"log"
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"log"
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"net"
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"net/http"
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"net/http"
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"net/http/httptrace"
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"net/http/httptrace"
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"net/url"
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"net/url"
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@ -23,9 +24,11 @@ import (
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"tailscale.com/derp/derphttp"
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"tailscale.com/derp/derphttp"
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"tailscale.com/ipn"
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"tailscale.com/ipn"
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"tailscale.com/net/interfaces"
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"tailscale.com/net/interfaces"
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"tailscale.com/net/portmapper"
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"tailscale.com/net/tshttpproxy"
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"tailscale.com/net/tshttpproxy"
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"tailscale.com/tailcfg"
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"tailscale.com/tailcfg"
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"tailscale.com/types/key"
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"tailscale.com/types/key"
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"tailscale.com/types/logger"
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"tailscale.com/wgengine/monitor"
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"tailscale.com/wgengine/monitor"
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)
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)
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@ -33,6 +36,7 @@ var debugArgs struct {
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monitor bool
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monitor bool
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getURL string
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getURL string
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derpCheck string
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derpCheck string
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portmap bool
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}
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}
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var debugModeFunc = debugMode // so it can be addressable
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var debugModeFunc = debugMode // so it can be addressable
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@ -40,6 +44,7 @@ var debugModeFunc = debugMode // so it can be addressable
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func debugMode(args []string) error {
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func debugMode(args []string) error {
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fs := flag.NewFlagSet("debug", flag.ExitOnError)
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fs := flag.NewFlagSet("debug", flag.ExitOnError)
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fs.BoolVar(&debugArgs.monitor, "monitor", false, "If true, run link monitor forever. Precludes all other options.")
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fs.BoolVar(&debugArgs.monitor, "monitor", false, "If true, run link monitor forever. Precludes all other options.")
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fs.BoolVar(&debugArgs.portmap, "portmap", false, "If true, run portmap debugging. Precludes all other options.")
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fs.StringVar(&debugArgs.getURL, "get-url", "", "If non-empty, fetch provided URL.")
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fs.StringVar(&debugArgs.getURL, "get-url", "", "If non-empty, fetch provided URL.")
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fs.StringVar(&debugArgs.derpCheck, "derp", "", "if non-empty, test a DERP ping via named region code")
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fs.StringVar(&debugArgs.derpCheck, "derp", "", "if non-empty, test a DERP ping via named region code")
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if err := fs.Parse(args); err != nil {
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if err := fs.Parse(args); err != nil {
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@ -55,6 +60,9 @@ func debugMode(args []string) error {
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if debugArgs.monitor {
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if debugArgs.monitor {
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return runMonitor(ctx)
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return runMonitor(ctx)
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}
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}
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if debugArgs.portmap {
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return debugPortmap(ctx)
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}
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if debugArgs.getURL != "" {
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if debugArgs.getURL != "" {
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return getURL(ctx, debugArgs.getURL)
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return getURL(ctx, debugArgs.getURL)
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}
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}
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@ -191,3 +199,63 @@ func checkDerp(ctx context.Context, derpRegion string) error {
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log.Printf("ok")
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log.Printf("ok")
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return err
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return err
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}
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}
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func debugPortmap(ctx context.Context) error {
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ctx, cancel := context.WithTimeout(ctx, 3*time.Second)
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defer cancel()
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done := make(chan bool, 1)
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var c *portmapper.Client
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logf := log.Printf
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c = portmapper.NewClient(logger.WithPrefix(logf, "portmapper: "), func() {
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logf("portmapping changed.")
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logf("have mapping: %v", c.HaveMapping())
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if ext, ok := c.GetCachedMappingOrStartCreatingOne(); ok {
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logf("cb: mapping: %v", ext)
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select {
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case done <- true:
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default:
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}
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return
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}
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logf("cb: no mapping")
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})
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linkMon, err := monitor.New(logger.WithPrefix(logf, "monitor: "))
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if err != nil {
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return err
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}
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c.SetGatewayLookupFunc(linkMon.GatewayAndSelfIP)
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res, err := c.Probe(ctx)
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if err != nil {
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return fmt.Errorf("Probe: %v", err)
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}
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logf("Probe: %+v", res)
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if !res.PCP && !res.PMP && !res.UPnP {
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logf("no portmapping services available")
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return nil
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}
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uc, err := net.ListenPacket("udp", "0.0.0.0:0")
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if err != nil {
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return err
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}
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defer uc.Close()
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c.SetLocalPort(uint16(uc.LocalAddr().(*net.UDPAddr).Port))
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if ext, ok := c.GetCachedMappingOrStartCreatingOne(); ok {
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logf("mapping: %v", ext)
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} else {
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logf("no mapping")
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}
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select {
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case <-done:
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return nil
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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