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Properly detect no alt domain set (#7323)

This commit is contained in:
Matt Keeler 2020-02-19 14:41:43 -05:00 committed by GitHub
parent ae424f25e6
commit 861f754dad
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2 changed files with 22 additions and 1 deletions
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8
agent/dns.go
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@ -190,7 +190,13 @@ func (d *DNSServer) ListenAndServe(network, addr string, notif func()) error {
d.mux = dns.NewServeMux()
d.mux.HandleFunc("arpa.", d.handlePtr)
d.mux.HandleFunc(d.domain, d.handleQuery)
if d.altDomain != "" {
// this is not an empty string check because NewDNSServer will have
// converted the configured alt domain into an FQDN which will ensure that
// the value ends with a ".". Therefore "." is the empty string equivalent
// for originally having no alternate domain set. If there is a reason
// why consul should be configured to handle the root zone I have yet
// to think of it.
if d.altDomain != "." {
d.mux.HandleFunc(d.altDomain, d.handleQuery)
}
d.toggleRecursorHandlerFromConfig(cfg)

15
agent/dns_test.go
View File

@ -188,6 +188,21 @@ func TestDNS_Over_TCP(t *testing.T) {
}
}
func TestDNS_EmptyAltDomain(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
m := new(dns.Msg)
m.SetQuestion("consul.service.", dns.TypeA)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
require.Empty(t, in.Answer)
}
func TestDNS_NodeLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")