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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package dns
import (
"fmt"
"os/exec"
"syscall"
"golang.org/x/sys/windows"
)
func flushCaches() error {
cmd := exec.Command("ipconfig", "/flushdns")
cmd.SysProcAttr = &syscall.SysProcAttr{
CreationFlags: windows.DETACHED_PROCESS,
}
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%v (output: %s)", err, out)
}
return nil
}
// Flush clears the local resolver cache.
//
// Only Windows has a public dns.Flush, needed in router_windows.go. Other
// platforms like Linux need a different flush implementation depending on
// the DNS manager. There is a FlushCaches method on the manager which
// can be used on all platforms.
func Flush() error {
return flushCaches()
}
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