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net/tstun: diagnose /dev/net/tun fd leak, give better failure message

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Updates #5029

Change-Id: Ibee5e0c9076fe764eb5d856d5ef8b09f4d0e2921
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-07-16 14:10:20 -07:00
committed by Brad Fitzpatrick
parent 931f18b575
commit 0d52674a84
4 changed files with 17 additions and 6 deletions
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9
net/tstun/tun.go
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@@ -74,15 +74,18 @@ func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
// tunDiagnoseFailure, if non-nil, does OS-specific diagnostics of why
// TUN failed to work.
var tunDiagnoseFailure func(tunName string, logf logger.Logf)
var tunDiagnoseFailure func(tunName string, logf logger.Logf, err error)
// Diagnose tries to explain a tuntap device creation failure.
// It pokes around the system and logs some diagnostic info that might
// help debug why tun creation failed. Because device creation has
// already failed and the program's about to end, log a lot.
func Diagnose(logf logger.Logf, tunName string) {
//
// The tunName is the name of the tun device that was requested but failed.
// The err error is how the tun creation failed.
func Diagnose(logf logger.Logf, tunName string, err error) {
if tunDiagnoseFailure != nil {
tunDiagnoseFailure(tunName, logf)
tunDiagnoseFailure(tunName, logf, err)
} else {
logf("no TUN failure diagnostics for OS %q", runtime.GOOS)
}