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Improve systemd-resolved detection

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When 127.0.0.53 is the only nameserver in /etc/resolv.conf assume
systemd-resolved is used. This is better because /etc/resolv.conf does
not have to be symlinked to /run/systemd/resolve/stub-resolv.conf in
order to use systemd-resolved.

[NO TESTS NEEDED]

Fixes: #10570

Signed-off-by: Paul Holzinger <pholzing@redhat.com>
This commit is contained in:
Paul Holzinger
2021-06-08 11:28:46 +02:00
parent 9a3a7327fd
commit 18fa124dfc
1 changed files with 9 additions and 11 deletions
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20
libpod/container_internal_linux.go
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@ -1650,22 +1650,20 @@ func (c *Container) generateResolvConf() (string, error) {
}
}
// Determine the endpoint for resolv.conf in case it is a symlink
resolvPath, err := filepath.EvalSymlinks(resolvConf)
contents, err := ioutil.ReadFile(resolvConf)
// resolv.conf doesn't have to exists
if err != nil && !os.IsNotExist(err) {
return "", err
}
// Determine if symlink points to any of the systemd-resolved files
if strings.HasPrefix(resolvPath, "/run/systemd/resolve/") {
resolvPath = "/run/systemd/resolve/resolv.conf"
}
contents, err := ioutil.ReadFile(resolvPath)
// resolv.conf doesn't have to exists
if err != nil && !os.IsNotExist(err) {
return "", err
ns := resolvconf.GetNameservers(contents)
// check if systemd-resolved is used, assume it is used when 127.0.0.53 is the only nameserver
if len(ns) == 1 && ns[0] == "127.0.0.53" {
// read the actual resolv.conf file for systemd-resolved
contents, err = ioutil.ReadFile("/run/systemd/resolve/resolv.conf")
if err != nil {
return "", errors.Wrapf(err, "detected that systemd-resolved is in use, but could not locate real resolv.conf")
}
}
ipv6 := false