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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package winipcfg
import (
"bytes"
"fmt"
"io"
"os/exec"
"path/filepath"
"strings"
"golang.org/x/sys/windows"
)
// I wish we didn't have to do this. netiohlp.dll (what's used by netsh.exe) has some nice tricks with writing directly
// to the registry and the nsi kernel object, but it's not clear copying those makes for a stable interface. WMI doesn't
// work with v6. CMI isn't in Windows 7.
func runNetsh(cmds []string) error {
system32, err := windows.GetSystemDirectory()
if err != nil {
return err
}
cmd := exec.Command(filepath.Join(system32, "netsh.exe")) // I wish we could append (, "-f", "CONIN$") but Go sets up the process context wrong.
stdin, err := cmd.StdinPipe()
if err != nil {
return fmt.Errorf("runNetsh stdin pipe - %v", err)
}
go func() {
defer stdin.Close()
io.WriteString(stdin, strings.Join(append(cmds, "exit\r\n"), "\r\n"))
}()
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("runNetsh run - %v", err)
}
// Horrible kludges, sorry.
cleaned := bytes.ReplaceAll(output, []byte("netsh>"), []byte{})
cleaned = bytes.ReplaceAll(cleaned, []byte("There are no Domain Name Servers (DNS) configured on this computer."), []byte{})
cleaned = bytes.TrimSpace(cleaned)
if len(cleaned) != 0 {
return fmt.Errorf("runNetsh returned error strings.\ninput:\n%s\noutput\n:%s",
strings.Join(cmds, "\n"), bytes.ReplaceAll(output, []byte{'\r', '\n'}, []byte{'\n'}))
}
return nil
}
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