agent: re-work DNS tests to not rely on the external network
This commit is contained in:
Ryan Uber
parent
ed4de526f1
commit
cd65aaa2e0
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@ -16,7 +16,7 @@ import (
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const (
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maxServiceResponses = 3 // For UDP only
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maxRecurseRecords = 3
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maxRecurseRecords = 5
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)
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// DNSServer is used to wrap an Agent and expose various
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@ -426,8 +426,9 @@ func (d *DNSServer) formatNodeRecord(node *structs.Node, addr, qName string, qTy
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// Recurse
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more := d.resolveCNAME(cnRec.Target)
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extra := 0
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MORE_REC:
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for extra, rr := range more {
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for _, rr := range more {
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switch rr.Header().Rrtype {
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case dns.TypeCNAME, dns.TypeA, dns.TypeAAAA:
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records = append(records, rr)
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@ -4,7 +4,6 @@ import (
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"fmt"
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"net"
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"os"
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"reflect"
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"strings"
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"testing"
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"time"
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@ -14,23 +13,72 @@ import (
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"github.com/miekg/dns"
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)
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func makeDNSServer(t *testing.T) (string, *DNSServer) {
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config := &DNSConfig{}
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return makeDNSServerConfig(t, config)
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}
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func makeDNSServerConfig(t *testing.T, config *DNSConfig) (string, *DNSServer) {
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func makeDNSServer(t *testing.T, config *DNSConfig, recursor *dns.Server) (string, *DNSServer) {
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if config == nil {
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config = &DNSConfig{}
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}
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recursors := []string{}
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if recursor != nil {
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recursors = append(recursors, recursor.Addr)
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}
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conf := nextConfig()
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addr, _ := conf.ClientListener(conf.Addresses.DNS, conf.Ports.DNS)
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dir, agent := makeAgent(t, conf)
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server, err := NewDNSServer(agent, config, agent.logOutput,
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conf.Domain, addr.String(), []string{"8.8.8.8:53"})
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conf.Domain, addr.String(), recursors)
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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return dir, server
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}
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// makeRecursor creates a generic DNS server which always returns
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// the provided reply. This is useful for mocking a DNS recursor with
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// an expected result.
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func makeRecursor(t *testing.T, answer []dns.RR) *dns.Server {
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dnsConf := nextConfig()
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dnsAddr := fmt.Sprintf("%s:%d", dnsConf.Addresses.DNS, dnsConf.Ports.DNS)
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mux := dns.NewServeMux()
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mux.HandleFunc(".", func(resp dns.ResponseWriter, msg *dns.Msg) {
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ans := &dns.Msg{Answer: answer[:]}
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ans.SetReply(msg)
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if err := resp.WriteMsg(ans); err != nil {
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t.Fatalf("err: %s", err)
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}
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})
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server := &dns.Server{
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Addr: dnsAddr,
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Net: "udp",
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Handler: mux,
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}
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go server.ListenAndServe()
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return server
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}
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// dnsCNAME returns a DNS CNAME record struct
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func dnsCNAME(src, dest string) *dns.CNAME {
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return &dns.CNAME{
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Hdr: dns.RR_Header{
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Name: dns.Fqdn(src),
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Rrtype: dns.TypeCNAME,
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Class: dns.ClassINET,
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},
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Target: dns.Fqdn(dest),
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}
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}
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// dnsA returns a DNS A record struct
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func dnsA(src, dest string) *dns.A {
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return &dns.A{
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Hdr: dns.RR_Header{
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Name: dns.Fqdn(src),
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
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A: net.ParseIP(dest),
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}
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}
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func TestRecursorAddr(t *testing.T) {
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addr, err := recursorAddr("8.8.8.8")
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if err != nil {
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@ -42,7 +90,7 @@ func TestRecursorAddr(t *testing.T) {
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}
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func TestDNS_NodeLookup(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -112,7 +160,7 @@ func TestDNS_NodeLookup(t *testing.T) {
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}
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func TestDNS_CaseInsensitiveNodeLookup(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -146,7 +194,7 @@ func TestDNS_CaseInsensitiveNodeLookup(t *testing.T) {
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}
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func TestDNS_NodeLookup_PeriodName(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -188,7 +236,7 @@ func TestDNS_NodeLookup_PeriodName(t *testing.T) {
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}
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func TestDNS_NodeLookup_AAAA(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -233,7 +281,13 @@ func TestDNS_NodeLookup_AAAA(t *testing.T) {
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}
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func TestDNS_NodeLookup_CNAME(t *testing.T) {
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dir, srv := makeDNSServer(t)
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recursor := makeRecursor(t, []dns.RR{
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dnsCNAME("www.google.com", "google.com"),
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dnsA("google.com", "1.2.3.4"),
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})
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defer recursor.Shutdown()
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dir, srv := makeDNSServer(t, nil, recursor)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -261,8 +315,8 @@ func TestDNS_NodeLookup_CNAME(t *testing.T) {
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t.Fatalf("err: %v", err)
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}
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// Should have the CNAME record + a few A records
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if len(in.Answer) < 2 {
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// Should have the service record, CNAME record + A record
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if len(in.Answer) != 3 {
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t.Fatalf("Bad: %#v", in)
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}
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@ -279,7 +333,7 @@ func TestDNS_NodeLookup_CNAME(t *testing.T) {
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}
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func TestDNS_ReverseLookup(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -321,7 +375,7 @@ func TestDNS_ReverseLookup(t *testing.T) {
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}
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func TestDNS_ReverseLookup_CustomDomain(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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srv.domain = dns.Fqdn("custom")
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@ -364,7 +418,7 @@ func TestDNS_ReverseLookup_CustomDomain(t *testing.T) {
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}
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func TestDNS_ReverseLookup_IPV6(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -406,7 +460,7 @@ func TestDNS_ReverseLookup_IPV6(t *testing.T) {
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}
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func TestDNS_ServiceLookup(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -473,7 +527,7 @@ func TestDNS_ServiceLookup(t *testing.T) {
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}
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func TestDNS_ServiceLookup_ServiceAddress(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -541,7 +595,7 @@ func TestDNS_ServiceLookup_ServiceAddress(t *testing.T) {
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}
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func TestDNS_CaseInsensitiveServiceLookup(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -580,7 +634,7 @@ func TestDNS_CaseInsensitiveServiceLookup(t *testing.T) {
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}
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func TestDNS_ServiceLookup_TagPeriod(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -641,7 +695,7 @@ func TestDNS_ServiceLookup_TagPeriod(t *testing.T) {
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}
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func TestDNS_ServiceLookup_Dedup(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -718,7 +772,7 @@ func TestDNS_ServiceLookup_Dedup(t *testing.T) {
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}
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func TestDNS_ServiceLookup_Dedup_SRV(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -823,7 +877,10 @@ func TestDNS_ServiceLookup_Dedup_SRV(t *testing.T) {
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}
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func TestDNS_Recurse(t *testing.T) {
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dir, srv := makeDNSServer(t)
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recursor := makeRecursor(t, []dns.RR{dnsA("apple.com", "1.2.3.4")})
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defer recursor.Shutdown()
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dir, srv := makeDNSServer(t, nil, recursor)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -831,7 +888,6 @@ func TestDNS_Recurse(t *testing.T) {
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m.SetQuestion("apple.com.", dns.TypeANY)
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c := new(dns.Client)
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c.Net = "tcp"
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addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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in, _, err := c.Exchange(m, addr.String())
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if err != nil {
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@ -847,7 +903,7 @@ func TestDNS_Recurse(t *testing.T) {
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}
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func TestDNS_ServiceLookup_FilterCritical(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -978,7 +1034,7 @@ func TestDNS_ServiceLookup_FilterCritical(t *testing.T) {
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}
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func TestDNS_ServiceLookup_OnlyPassing(t *testing.T) {
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dir, srv := makeDNSServerConfig(t, &DNSConfig{OnlyPassing: true})
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dir, srv := makeDNSServer(t, &DNSConfig{OnlyPassing: true}, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -1094,7 +1150,7 @@ func TestDNS_ServiceLookup_OnlyPassing(t *testing.T) {
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}
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func TestDNS_ServiceLookup_Randomize(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -1162,7 +1218,13 @@ func TestDNS_ServiceLookup_Randomize(t *testing.T) {
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}
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func TestDNS_ServiceLookup_CNAME(t *testing.T) {
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dir, srv := makeDNSServer(t)
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recursor := makeRecursor(t, []dns.RR{
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dnsCNAME("www.google.com", "google.com"),
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dnsA("google.com", "1.2.3.4"),
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})
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defer recursor.Shutdown()
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dir, srv := makeDNSServer(t, nil, recursor)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -1194,11 +1256,12 @@ func TestDNS_ServiceLookup_CNAME(t *testing.T) {
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t.Fatalf("err: %v", err)
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}
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if len(in.Answer) < 2 {
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// Service CNAME, google CNAME, google A record
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if len(in.Answer) != 3 {
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t.Fatalf("Bad: %#v", in)
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}
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// Should have google CNAME
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// Should have service CNAME
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cnRec, ok := in.Answer[0].(*dns.CNAME)
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if !ok {
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t.Fatalf("Bad: %#v", in.Answer[0])
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@ -1207,22 +1270,35 @@ func TestDNS_ServiceLookup_CNAME(t *testing.T) {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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// Should have google CNAME
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cnRec, ok = in.Answer[1].(*dns.CNAME)
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if !ok {
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t.Fatalf("Bad: %#v", in.Answer[1])
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}
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if cnRec.Target != "google.com." {
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t.Fatalf("Bad: %#v", in.Answer[1])
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}
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// Check we recursively resolve
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for _, ans := range in.Answer[1:] {
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if _, ok := ans.(*dns.A); !ok {
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t.Fatalf("Bad: %#v", ans)
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}
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if _, ok := in.Answer[2].(*dns.A); !ok {
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t.Fatalf("Bad: %#v", in.Answer[2])
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}
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}
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func TestDNS_NodeLookup_TTL(t *testing.T) {
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recursor := makeRecursor(t, []dns.RR{
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dnsCNAME("www.google.com", "google.com"),
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dnsA("google.com", "1.2.3.4"),
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})
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defer recursor.Shutdown()
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config := &DNSConfig{
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NodeTTL: 10 * time.Second,
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AllowStale: true,
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MaxStale: time.Second,
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}
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dir, srv := makeDNSServerConfig(t, config)
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dir, srv := makeDNSServer(t, config, recursor)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -1344,7 +1420,7 @@ func TestDNS_ServiceLookup_TTL(t *testing.T) {
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MaxStale: time.Second,
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}
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dir, srv := makeDNSServerConfig(t, config)
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dir, srv := makeDNSServer(t, config, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -1439,7 +1515,7 @@ func TestDNS_ServiceLookup_TTL(t *testing.T) {
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}
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func TestDNS_ServiceLookup_SRV_RFC(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -1506,7 +1582,7 @@ func TestDNS_ServiceLookup_SRV_RFC(t *testing.T) {
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}
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func TestDNS_ServiceLookup_SRV_RFC_TCP_Default(t *testing.T) {
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dir, srv := makeDNSServer(t)
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dir, srv := makeDNSServer(t, nil, nil)
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defer os.RemoveAll(dir)
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defer srv.agent.Shutdown()
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@ -1571,133 +1647,3 @@ func TestDNS_ServiceLookup_SRV_RFC_TCP_Default(t *testing.T) {
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t.Fatalf("Bad: %#v", in.Extra[0])
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}
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}
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func TestDNS_CNAME_recurse(t *testing.T) {
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// Create our recursor - Consul will recurse to this
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dnsConf := nextConfig()
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dnsAddr := fmt.Sprintf("%s:%d", dnsConf.Addresses.DNS, dnsConf.Ports.DNS)
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mux := dns.NewServeMux()
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mux.HandleFunc(".", func(resp dns.ResponseWriter, msg *dns.Msg) {
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cnResp := func(src, target string) *dns.CNAME {
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return &dns.CNAME{
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Hdr: dns.RR_Header{
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Name: src,
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Rrtype: dns.TypeCNAME,
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Class: dns.ClassINET,
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},
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Target: target,
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}
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}
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// Create the answer
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ans := &dns.Msg{}
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ans.SetReply(msg)
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ans.Answer = append(ans.Answer,
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cnResp("a.example.com.", "b.example.com."),
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cnResp("b.example.com.", "c.example.com."),
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cnResp("c.example.com.", "d.example.com."),
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&dns.A{
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Hdr: dns.RR_Header{
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Name: "d.example.com.",
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
|
||||
A: net.ParseIP("1.2.3.4"),
|
||||
})
|
||||
|
||||
// Write the answer back to the client
|
||||
if err := resp.WriteMsg(ans); err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
})
|
||||
server := &dns.Server{
|
||||
Addr: dnsAddr,
|
||||
Net: "udp",
|
||||
Handler: mux,
|
||||
}
|
||||
go server.ListenAndServe()
|
||||
defer server.Shutdown()
|
||||
|
||||
// Create the Consul server
|
||||
dconf := &DNSConfig{}
|
||||
config := nextConfig()
|
||||
addr, _ := config.ClientListener(config.Addresses.DNS, config.Ports.DNS)
|
||||
dir, agent := makeAgent(t, config)
|
||||
defer os.RemoveAll(dir)
|
||||
defer agent.Shutdown()
|
||||
|
||||
srv, err := NewDNSServer(agent, dconf, agent.logOutput,
|
||||
config.Domain, addr.String(), []string{dnsAddr})
|
||||
if err != nil {
|
||||
t.Fatalf("err: %v", err)
|
||||
}
|
||||
|
||||
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
|
||||
|
||||
// Register a service with a recursing CNAME as the address
|
||||
args := &structs.RegisterRequest{
|
||||
Datacenter: "dc1",
|
||||
Node: "foo",
|
||||
Address: "a.example.com",
|
||||
Service: &structs.NodeService{
|
||||
Service: "db",
|
||||
Tags: []string{"master"},
|
||||
Address: "a.example.com",
|
||||
Port: 12345,
|
||||
},
|
||||
}
|
||||
|
||||
var out struct{}
|
||||
if err := srv.agent.RPC("Catalog.Register", args, &out); err != nil {
|
||||
t.Fatalf("err: %v", err)
|
||||
}
|
||||
|
||||
// Create the DNS query against the Consul server
|
||||
m := new(dns.Msg)
|
||||
m.SetQuestion("db.service.consul.", dns.TypeA)
|
||||
|
||||
c := new(dns.Client)
|
||||
c.Net = "tcp"
|
||||
in, _, err := c.Exchange(m, addr.String())
|
||||
if err != nil {
|
||||
t.Fatalf("err: %v", err)
|
||||
}
|
||||
|
||||
// Should have all 3 CNAMES and the A record
|
||||
if len(in.Answer) != 4 {
|
||||
t.Fatalf("Bad: %#v", in)
|
||||
}
|
||||
|
||||
// Check all the records
|
||||
expected := []dns.RR{
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Rrtype: dns.TypeCNAME,
|
||||
},
|
||||
Target: "abc",
|
||||
},
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Rrtype: dns.TypeCNAME,
|
||||
},
|
||||
Target: "abc",
|
||||
},
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Rrtype: dns.TypeCNAME,
|
||||
},
|
||||
Target: "abc",
|
||||
},
|
||||
&dns.A{
|
||||
Hdr: dns.RR_Header{
|
||||
Rrtype: dns.TypeCNAME,
|
||||
},
|
||||
A: net.ParseIP("1.2.3.4"),
|
||||
},
|
||||
}
|
||||
|
||||
if !reflect.DeepEqual(expected, in.Answer) {
|
||||
t.Fatalf("Bad: %v %v", expected, in.Answer)
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue