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net/portmapper: fix UPnP probing, work against all ports

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Prior to Tailscale 1.12 it detected UPnP on any port.
Starting with Tailscale 1.11.x, it stopped detecting UPnP on all ports.

Then start plumbing its discovered Location header port number to the
code that was assuming port 5000.

Fixes #2109

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-08-02 22:09:50 -07:00
committed by Brad Fitzpatrick
parent f013960d87
commit fdc081c291
9 changed files with 310 additions and 72 deletions
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30
cmd/tailscaled/debug.go
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@@ -206,6 +206,22 @@ func debugPortmap(ctx context.Context) error {
ctx, cancel := context.WithTimeout(ctx, 3*time.Second)
defer cancel()
portmapper.VerboseLogs = true
switch os.Getenv("TS_DEBUG_PORTMAP_TYPE") {
case "":
case "pmp":
portmapper.DisablePCP = true
portmapper.DisableUPnP = true
case "pcp":
portmapper.DisablePMP = true
portmapper.DisableUPnP = true
case "upnp":
portmapper.DisablePCP = true
portmapper.DisablePMP = true
default:
log.Fatalf("TS_DEBUG_PORTMAP_TYPE must be one of pmp,pcp,upnp")
}
done := make(chan bool, 1)
var c *portmapper.Client
@@ -248,6 +264,13 @@ func debugPortmap(ctx context.Context) error {
}
logf("gw=%v; self=%v", gw, selfIP)
uc, err := net.ListenPacket("udp", "0.0.0.0:0")
if err != nil {
return err
}
defer uc.Close()
c.SetLocalPort(uint16(uc.LocalAddr().(*net.UDPAddr).Port))
res, err := c.Probe(ctx)
if err != nil {
return fmt.Errorf("Probe: %v", err)
@@ -259,13 +282,6 @@ func debugPortmap(ctx context.Context) error {
return nil
}
uc, err := net.ListenPacket("udp", "0.0.0.0:0")
if err != nil {
return err
}
defer uc.Close()
c.SetLocalPort(uint16(uc.LocalAddr().(*net.UDPAddr).Port))
if ext, ok := c.GetCachedMappingOrStartCreatingOne(); ok {
logf("mapping: %v", ext)
} else {