consul/agent/dns_node_lookup_test.go

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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1
package agent
import (
"context"
"testing"
"github.com/miekg/dns"
"github.com/stretchr/testify/require"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/testrpc"
)
// TODO (v2-dns): Failing on "lookup a non-existing node, we should receive a SOA"
// it is coming back empty.
func TestDNS_NodeLookup(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(false) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
TaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
NodeMeta: map[string]string{
"key": "value",
},
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("foo.node.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
require.Len(t, in.Answer, 2)
require.Len(t, in.Extra, 0)
aRec, ok := in.Answer[0].(*dns.A)
require.True(t, ok, "First answer is not an A record")
require.Equal(t, "127.0.0.1", aRec.A.String())
require.Equal(t, uint32(0), aRec.Hdr.Ttl)
txt, ok := in.Answer[1].(*dns.TXT)
require.True(t, ok, "Second answer is not a TXT record")
require.Len(t, txt.Txt, 1)
require.Equal(t, "key=value", txt.Txt[0])
// Re-do the query, but only for an A RR
m = new(dns.Msg)
m.SetQuestion("foo.node.consul.", dns.TypeA)
c = new(dns.Client)
in, _, err = c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
require.Len(t, in.Answer, 1)
require.Len(t, in.Extra, 1)
aRec, ok = in.Answer[0].(*dns.A)
require.True(t, ok, "Answer is not an A record")
require.Equal(t, "127.0.0.1", aRec.A.String())
require.Equal(t, uint32(0), aRec.Hdr.Ttl)
txt, ok = in.Extra[0].(*dns.TXT)
require.True(t, ok, "Extra record is not a TXT record")
require.Len(t, txt.Txt, 1)
require.Equal(t, "key=value", txt.Txt[0])
// Re-do the query, but specify the DC
m = new(dns.Msg)
m.SetQuestion("foo.node.dc1.consul.", dns.TypeANY)
c = new(dns.Client)
in, _, err = c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
require.Len(t, in.Answer, 2)
require.Len(t, in.Extra, 0)
aRec, ok = in.Answer[0].(*dns.A)
require.True(t, ok, "First answer is not an A record")
require.Equal(t, "127.0.0.1", aRec.A.String())
require.Equal(t, uint32(0), aRec.Hdr.Ttl)
_, ok = in.Answer[1].(*dns.TXT)
require.True(t, ok, "Second answer is not a TXT record")
// lookup a non-existing node, we should receive a SOA
m = new(dns.Msg)
m.SetQuestion("nofoo.node.dc1.consul.", dns.TypeANY)
c = new(dns.Client)
in, _, err = c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
require.Len(t, in.Ns, 1)
soaRec, ok := in.Ns[0].(*dns.SOA)
require.True(t, ok, "NS RR is not a SOA record")
require.Equal(t, uint32(0), soaRec.Hdr.Ttl)
})
}
}
func TestDNS_NodeLookup_CaseInsensitive(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "Foo",
Address: "127.0.0.1",
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("fOO.node.dc1.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("empty lookup: %#v", in)
}
})
}
}
// TODO (v2-dns): NET-7632 - Fix node lookup when question name has a period in it.
// Answer is coming back empty
func TestDNS_NodeLookup_PeriodName(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(false) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node with period in name
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo.bar",
Address: "127.0.0.1",
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("foo.bar.node.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Answer[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
})
}
}
func TestDNS_NodeLookup_AAAA(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "::4242:4242",
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("bar.node.consul.", dns.TypeAAAA)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Answer[0].(*dns.AAAA)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.AAAA.String() != "::4242:4242" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
})
}
}
// TODO (v2-dns): NET-7631 - Implement external CNAME references
// Failing on answer assertion. some CNAMEs are not getting created
// and the record type on the AAAA record is incorrect.
// External services do not appear to be working properly here
// and in the service lookup tests.
func TestDNS_NodeLookup_CNAME(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
dnsTXT("google.com", []string{"my_txt_value"}),
},
})
defer recursor.Shutdown()
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, `
recursors = ["`+recursor.Addr+`"]
`+experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "google",
Address: "www.google.com",
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("google.node.consul.", dns.TypeANY)
m.SetEdns0(8192, true)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAnswer := []dns.RR{
&dns.CNAME{
Hdr: dns.RR_Header{Name: "google.node.consul.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: 0, Rdlength: 0x10},
Target: "www.google.com.",
},
&dns.CNAME{
Hdr: dns.RR_Header{Name: "www.google.com.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Rdlength: 0x2},
Target: "google.com.",
},
&dns.A{
Hdr: dns.RR_Header{Name: "google.com.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
A: []byte{0x1, 0x2, 0x3, 0x4}, // 1.2.3.4
},
&dns.TXT{
Hdr: dns.RR_Header{Name: "google.com.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Rdlength: 0xd},
Txt: []string{"my_txt_value"},
},
}
require.Equal(t, wantAnswer, in.Answer)
})
}
}
func TestDNS_NodeLookup_TXT(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "google",
Address: "127.0.0.1",
NodeMeta: map[string]string{
"rfc1035-00": "value0",
"key0": "value1",
},
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("google.node.consul.", dns.TypeTXT)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Should have the 1 TXT record reply
if len(in.Answer) != 2 {
t.Fatalf("Bad: %#v", in)
}
txtRec, ok := in.Answer[0].(*dns.TXT)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if len(txtRec.Txt) != 1 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if txtRec.Txt[0] != "value0" && txtRec.Txt[0] != "key0=value1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
})
}
}
func TestDNS_NodeLookup_TXT_DontSuppress(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, `dns_config = { enable_additional_node_meta_txt = false } `+experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "google",
Address: "127.0.0.1",
NodeMeta: map[string]string{
"rfc1035-00": "value0",
"key0": "value1",
},
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("google.node.consul.", dns.TypeTXT)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Should have the 1 TXT record reply
if len(in.Answer) != 2 {
t.Fatalf("Bad: %#v", in)
}
txtRec, ok := in.Answer[0].(*dns.TXT)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if len(txtRec.Txt) != 1 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if txtRec.Txt[0] != "value0" && txtRec.Txt[0] != "key0=value1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
})
}
}
func TestDNS_NodeLookup_ANY(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.1",
NodeMeta: map[string]string{
"key": "value",
},
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("bar.node.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAnswer := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "bar.node.consul.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
A: []byte{0x7f, 0x0, 0x0, 0x1}, // 127.0.0.1
},
&dns.TXT{
Hdr: dns.RR_Header{Name: "bar.node.consul.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Rdlength: 0xa},
Txt: []string{"key=value"},
},
}
require.Equal(t, wantAnswer, in.Answer)
})
}
}
func TestDNS_NodeLookup_ANY_DontSuppressTXT(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, `dns_config = { enable_additional_node_meta_txt = false } `+experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.1",
NodeMeta: map[string]string{
"key": "value",
},
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("bar.node.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAnswer := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "bar.node.consul.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
A: []byte{0x7f, 0x0, 0x0, 0x1}, // 127.0.0.1
},
&dns.TXT{
Hdr: dns.RR_Header{Name: "bar.node.consul.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Rdlength: 0xa},
Txt: []string{"key=value"},
},
}
require.Equal(t, wantAnswer, in.Answer)
})
}
}
func TestDNS_NodeLookup_A_SuppressTXT(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, `dns_config = { enable_additional_node_meta_txt = false } `+experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.1",
NodeMeta: map[string]string{
"key": "value",
},
}
var out struct{}
require.NoError(t, a.RPC(context.Background(), "Catalog.Register", args, &out))
m := new(dns.Msg)
m.SetQuestion("bar.node.consul.", dns.TypeA)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
wantAnswer := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "bar.node.consul.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
A: []byte{0x7f, 0x0, 0x0, 0x1}, // 127.0.0.1
},
}
require.Equal(t, wantAnswer, in.Answer)
// ensure TXT RR suppression
require.Len(t, in.Extra, 0)
})
}
}
// TODO (v2-dns): NET-7631 - Implement external CNAME references
// Failing on "Should have the CNAME record + a few A records" comment
// External services do not appear to be working properly here either.
func TestDNS_NodeLookup_TTL(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
},
})
defer recursor.Shutdown()
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, `
recursors = ["`+recursor.Addr+`"]
dns_config {
node_ttl = "10s"
allow_stale = true
max_stale = "1s"
}
`+experimentsHCL)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
}
var out struct{}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("foo.node.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Answer[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.Hdr.Ttl != 10 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
// Register node with IPv6
args = &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "::4242:4242",
}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
// Check an IPv6 record
m = new(dns.Msg)
m.SetQuestion("bar.node.consul.", dns.TypeANY)
in, _, err = c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aaaaRec, ok := in.Answer[0].(*dns.AAAA)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aaaaRec.AAAA.String() != "::4242:4242" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aaaaRec.Hdr.Ttl != 10 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
// Register node with CNAME
args = &structs.RegisterRequest{
Datacenter: "dc1",
Node: "google",
Address: "www.google.com",
}
if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m = new(dns.Msg)
m.SetQuestion("google.node.consul.", dns.TypeANY)
in, _, err = c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Should have the CNAME record + a few A records
if len(in.Answer) < 2 {
t.Fatalf("Bad: %#v", in)
}
cnRec, ok := in.Answer[0].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if cnRec.Target != "www.google.com." {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if cnRec.Hdr.Ttl != 10 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
})
}
}