|
|
|
@ -9,6 +9,7 @@ import (
|
|
|
|
|
"bytes"
|
|
|
|
|
_ "embed"
|
|
|
|
|
"fmt"
|
|
|
|
|
"io/ioutil"
|
|
|
|
|
"os"
|
|
|
|
|
"os/exec"
|
|
|
|
|
"path/filepath"
|
|
|
|
@ -90,13 +91,45 @@ func isResolvconfActive() bool {
|
|
|
|
|
// implementation of the `resolvconf` program, written by Thomas Hood.
|
|
|
|
|
type resolvconfManager struct {
|
|
|
|
|
logf logger.Logf
|
|
|
|
|
listRecordsPath string
|
|
|
|
|
interfacesDir string
|
|
|
|
|
scriptInstalled bool // libc update script has been installed
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func newResolvconfManager(logf logger.Logf) *resolvconfManager {
|
|
|
|
|
return &resolvconfManager{
|
|
|
|
|
logf: logf,
|
|
|
|
|
ret := &resolvconfManager{
|
|
|
|
|
logf: logf,
|
|
|
|
|
listRecordsPath: "/lib/resolvconf/list-records",
|
|
|
|
|
interfacesDir: "/etc/resolvconf/run/interface", // panic fallback if nothing seems to work
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if _, err := os.Stat(ret.listRecordsPath); os.IsNotExist(err) {
|
|
|
|
|
// This might be a Debian system from before the big /usr
|
|
|
|
|
// merge, try /usr instead.
|
|
|
|
|
ret.listRecordsPath = "/usr" + ret.listRecordsPath
|
|
|
|
|
}
|
|
|
|
|
// The runtime directory is currently (2020-04) canonically
|
|
|
|
|
// /etc/resolvconf/run, but the manpage is making noise about
|
|
|
|
|
// switching to /run/resolvconf and dropping the /etc path. So,
|
|
|
|
|
// let's probe the possible directories and use the first one
|
|
|
|
|
// that works.
|
|
|
|
|
for _, path := range []string{
|
|
|
|
|
"/etc/resolvconf/run/interface",
|
|
|
|
|
"/run/resolvconf/interface",
|
|
|
|
|
"/var/run/resolvconf/interface",
|
|
|
|
|
} {
|
|
|
|
|
if _, err := os.Stat(path); err == nil {
|
|
|
|
|
ret.interfacesDir = path
|
|
|
|
|
break
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if ret.interfacesDir == "" {
|
|
|
|
|
// None of the paths seem to work, use the canonical location
|
|
|
|
|
// that the current manpage says to use.
|
|
|
|
|
ret.interfacesDir = "/etc/resolvconf/run/interfaces"
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return ret
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (m *resolvconfManager) SetDNS(config OSConfig) error {
|
|
|
|
@ -133,7 +166,36 @@ func (m *resolvconfManager) SupportsSplitDNS() bool {
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (m *resolvconfManager) GetBaseConfig() (OSConfig, error) {
|
|
|
|
|
return OSConfig{}, ErrGetBaseConfigNotSupported
|
|
|
|
|
var bs bytes.Buffer
|
|
|
|
|
|
|
|
|
|
cmd := exec.Command(m.listRecordsPath)
|
|
|
|
|
// list-records assumes it's being run with CWD set to the
|
|
|
|
|
// interfaces runtime dir, and returns nonsense otherwise.
|
|
|
|
|
cmd.Dir = m.interfacesDir
|
|
|
|
|
cmd.Stdout = &bs
|
|
|
|
|
if err := cmd.Run(); err != nil {
|
|
|
|
|
return OSConfig{}, err
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var conf bytes.Buffer
|
|
|
|
|
sc := bufio.NewScanner(&bs)
|
|
|
|
|
for sc.Scan() {
|
|
|
|
|
if sc.Text() == resolvconfConfigName {
|
|
|
|
|
continue
|
|
|
|
|
}
|
|
|
|
|
bs, err := ioutil.ReadFile(filepath.Join(m.interfacesDir, sc.Text()))
|
|
|
|
|
if err != nil {
|
|
|
|
|
if os.IsNotExist(err) {
|
|
|
|
|
// Probably raced with a deletion, that's okay.
|
|
|
|
|
continue
|
|
|
|
|
}
|
|
|
|
|
return OSConfig{}, err
|
|
|
|
|
}
|
|
|
|
|
conf.Write(bs)
|
|
|
|
|
conf.WriteByte('\n')
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return readResolv(&conf)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (m *resolvconfManager) Close() error {
|
|
|
|
|