diff --git a/command/agent/dns.go b/command/agent/dns.go index 7f373cd41198..d9e281997120 100644 --- a/command/agent/dns.go +++ b/command/agent/dns.go @@ -876,8 +876,7 @@ func (d *DNSServer) serviceSRVRecords(dc string, nodes structs.CheckServiceNodes // Add the extra record records := d.formatNodeRecord(node.Node, addr, srvRec.Target, dns.TypeANY, ttl) - - if records != nil { + if len(records) > 0 { // Use the node address if it doesn't differ from the service address if addr == node.Node.Address { resp.Extra = append(resp.Extra, records...) @@ -900,6 +899,10 @@ func (d *DNSServer) serviceSRVRecords(dc string, nodes structs.CheckServiceNodes srvRec.Target = fmt.Sprintf("%s.addr.%s.%s", hex.EncodeToString(record.AAAA), dc, d.domain) record.Hdr.Name = srvRec.Target resp.Extra = append(resp.Extra, record) + + // Something else (probably a CNAME; just add the records). + default: + resp.Extra = append(resp.Extra, records...) } } } diff --git a/command/agent/dns_test.go b/command/agent/dns_test.go index 8eabfa804f37..0f52d134095b 100644 --- a/command/agent/dns_test.go +++ b/command/agent/dns_test.go @@ -988,7 +988,7 @@ func TestDNS_ExternalServiceToConsulCNAMENestedLookup(t *testing.T) { } } -func TestDNS_ServiceLookup_ServiceAddress(t *testing.T) { +func TestDNS_ServiceLookup_ServiceAddress_A(t *testing.T) { dir, srv := makeDNSServer(t) defer os.RemoveAll(dir) defer srv.agent.Shutdown() @@ -1083,6 +1083,101 @@ func TestDNS_ServiceLookup_ServiceAddress(t *testing.T) { } } +func TestDNS_ServiceLookup_ServiceAddress_CNAME(t *testing.T) { + dir, srv := makeDNSServer(t) + defer os.RemoveAll(dir) + defer srv.agent.Shutdown() + + testutil.WaitForLeader(t, srv.agent.RPC, "dc1") + + // Register a node with a service whose address isn't an IP. + { + args := &structs.RegisterRequest{ + Datacenter: "dc1", + Node: "foo", + Address: "127.0.0.1", + Service: &structs.NodeService{ + Service: "db", + Tags: []string{"master"}, + Address: "www.google.com", + Port: 12345, + }, + } + + var out struct{} + if err := srv.agent.RPC("Catalog.Register", args, &out); err != nil { + t.Fatalf("err: %v", err) + } + } + + // Register an equivalent prepared query. + var id string + { + args := &structs.PreparedQueryRequest{ + Datacenter: "dc1", + Op: structs.PreparedQueryCreate, + Query: &structs.PreparedQuery{ + Name: "test", + Service: structs.ServiceQuery{ + Service: "db", + }, + }, + } + if err := srv.agent.RPC("PreparedQuery.Apply", args, &id); err != nil { + t.Fatalf("err: %v", err) + } + } + + // Look up the service directly and via prepared query. + questions := []string{ + "db.service.consul.", + id + ".query.consul.", + } + for _, question := range questions { + m := new(dns.Msg) + m.SetQuestion(question, dns.TypeSRV) + + c := new(dns.Client) + addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS) + in, _, err := c.Exchange(m, addr.String()) + if err != nil { + t.Fatalf("err: %v", err) + } + + if len(in.Answer) != 1 { + t.Fatalf("Bad: %#v", in) + } + + srvRec, ok := in.Answer[0].(*dns.SRV) + if !ok { + t.Fatalf("Bad: %#v", in.Answer[0]) + } + if srvRec.Port != 12345 { + t.Fatalf("Bad: %#v", srvRec) + } + if srvRec.Target != "foo.node.dc1.consul." { + t.Fatalf("Bad: %#v", srvRec) + } + if srvRec.Hdr.Ttl != 0 { + t.Fatalf("Bad: %#v", in.Answer[0]) + } + + cnameRec, ok := in.Extra[0].(*dns.CNAME) + if !ok { + t.Fatalf("Bad: %#v", in.Extra[0]) + } + if cnameRec.Hdr.Name != "foo.node.dc1.consul." { + t.Fatalf("Bad: %#v", in.Extra[0]) + } + if cnameRec.Target != "www.google.com." { + t.Fatalf("Bad: %#v", in.Extra[0]) + } + if cnameRec.Hdr.Ttl != 0 { + t.Fatalf("Bad: %#v", in.Extra[0]) + } + } +} + func TestDNS_ServiceLookup_ServiceAddressIPV6(t *testing.T) { dir, srv := makeDNSServer(t) defer os.RemoveAll(dir)