mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-26 11:35:35 +00:00
a320d70614
In some containers, /etc/resolv.conf is a bind-mount from outside the container. This prevents renaming to or from /etc/resolv.conf, because it's on a different filesystem from linux's perspective. It also prevents removing /etc/resolv.conf, because doing so would break the bind-mount. If we find ourselves within this environment, fall back to using copy+delete when renaming to /etc/resolv.conf, and copy+truncate when renaming from /etc/resolv.conf. Fixes #3000 Co-authored-by: Denton Gentry <dgentry@tailscale.com> Signed-off-by: David Anderson <danderson@tailscale.com>
41 lines
981 B
Go
41 lines
981 B
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package dns
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
|
|
"tailscale.com/types/logger"
|
|
)
|
|
|
|
func NewOSConfigurator(logf logger.Logf, _ string) (OSConfigurator, error) {
|
|
bs, err := ioutil.ReadFile("/etc/resolv.conf")
|
|
if os.IsNotExist(err) {
|
|
return newDirectManager(logf), nil
|
|
}
|
|
if err != nil {
|
|
return nil, fmt.Errorf("reading /etc/resolv.conf: %w", err)
|
|
}
|
|
|
|
switch resolvOwner(bs) {
|
|
case "resolvconf":
|
|
switch resolvconfStyle() {
|
|
case "":
|
|
return newDirectManager(logf), nil
|
|
case "debian":
|
|
return newDebianResolvconfManager(logf)
|
|
case "openresolv":
|
|
return newOpenresolvManager()
|
|
default:
|
|
logf("[unexpected] got unknown flavor of resolvconf %q, falling back to direct manager", resolvconfStyle())
|
|
return newDirectManager(logf), nil
|
|
}
|
|
default:
|
|
return newDirectManager(logf), nil
|
|
}
|
|
}
|