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net/dns: log why resolved does not look like it's on use [Linux]

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Updates #3742
Updates #3531

Change-Id: I9fc7fa0f4bcab1cf8001ba92408c660a5b25f105
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-01-24 08:19:24 -08:00 committed by Brad Fitzpatrick
parent ff3442d92d
commit 6feb8f4c51
2 changed files with 11 additions and 7 deletions
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4
net/dns/manager_linux.go
View File

@ -95,6 +95,7 @@ func dnsMode(logf logger.Logf, env newOSConfigEnv) (ret string, err error) {
// try to program resolved in that case.
// https://github.com/tailscale/tailscale/issues/2136
if err := resolvedIsActuallyResolver(bs); err != nil {
logf("dns: resolvedIsActuallyResolver error: %v", err)
dbg("resolved", "not-in-use")
return "direct", nil
}
@ -184,6 +185,7 @@ func dnsMode(logf logger.Logf, env newOSConfigEnv) (ret string, err error) {
// Sometimes, NetworkManager owns the configuration but points
// it at systemd-resolved.
if err := resolvedIsActuallyResolver(bs); err != nil {
logf("dns: resolvedIsActuallyResolver error: %v", err)
dbg("resolved", "not-in-use")
// You'd think we would use newNMManager here. However, as
// explained in
@ -300,7 +302,7 @@ func resolvedIsActuallyResolver(bs []byte) error {
}
for _, ns := range cfg.Nameservers {
if ns != netaddr.IPv4(127, 0, 0, 53) {
return errors.New("resolv.conf doesn't point to systemd-resolved")
return fmt.Errorf("resolv.conf doesn't point to systemd-resolved; points to %v", cfg.Nameservers)
}
}
return nil

14
net/dns/manager_linux_test.go
View File

@ -34,8 +34,9 @@ func TestLinuxDNSMode(t *testing.T) {
resolvDotConf(
"# Managed by NetworkManager",
"nameserver 10.0.0.1")),
wantLog: "dns: [rc=nm resolved=not-in-use ret=direct]",
want: "direct",
wantLog: "dns: resolvedIsActuallyResolver error: resolv.conf doesn't point to systemd-resolved; points to [10.0.0.1]\n" +
"dns: [rc=nm resolved=not-in-use ret=direct]",
want: "direct",
},
{
name: "resolvconf_but_no_resolvconf_binary",
@ -123,10 +124,11 @@ func TestLinuxDNSMode(t *testing.T) {
// alleged that it was managed by systemd-resolved, but it
// was actually a completely static config file pointing
// elsewhere.
name: "allegedly_resolved_but_not_in_resolv.conf",
env: env(resolvDotConf("# Managed by systemd-resolved", "nameserver 10.0.0.1")),
wantLog: "dns: [rc=resolved resolved=not-in-use ret=direct]",
want: "direct",
name: "allegedly_resolved_but_not_in_resolv.conf",
env: env(resolvDotConf("# Managed by systemd-resolved", "nameserver 10.0.0.1")),
wantLog: "dns: resolvedIsActuallyResolver error: resolv.conf doesn't point to systemd-resolved; points to [10.0.0.1]\n" +
"dns: [rc=resolved resolved=not-in-use ret=direct]",
want: "direct",
},
{
// We used to incorrectly decide that resolved wasn't in