mirror of https://github.com/hashicorp/consul
705 lines
17 KiB
Go
705 lines
17 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package agent
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import (
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"context"
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"testing"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/require"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/testrpc"
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)
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func TestDNS_NodeLookup(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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// Register node
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "foo",
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Address: "127.0.0.1",
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TaggedAddresses: map[string]string{
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"wan": "127.0.0.2",
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},
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NodeMeta: map[string]string{
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"key": "value",
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},
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("foo.node.consul.", dns.TypeANY)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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require.NoError(t, err)
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require.Len(t, in.Answer, 2)
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require.Len(t, in.Extra, 0)
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aRec, ok := in.Answer[0].(*dns.A)
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require.True(t, ok, "First answer is not an A record")
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require.Equal(t, "127.0.0.1", aRec.A.String())
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require.Equal(t, uint32(0), aRec.Hdr.Ttl)
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txt, ok := in.Answer[1].(*dns.TXT)
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require.True(t, ok, "Second answer is not a TXT record")
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require.Len(t, txt.Txt, 1)
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require.Equal(t, "key=value", txt.Txt[0])
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// Re-do the query, but only for an A RR
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m = new(dns.Msg)
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m.SetQuestion("foo.node.consul.", dns.TypeA)
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c = new(dns.Client)
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in, _, err = c.Exchange(m, a.DNSAddr())
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require.NoError(t, err)
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require.Len(t, in.Answer, 1)
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require.Len(t, in.Extra, 1)
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aRec, ok = in.Answer[0].(*dns.A)
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require.True(t, ok, "Answer is not an A record")
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require.Equal(t, "127.0.0.1", aRec.A.String())
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require.Equal(t, uint32(0), aRec.Hdr.Ttl)
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txt, ok = in.Extra[0].(*dns.TXT)
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require.True(t, ok, "Extra record is not a TXT record")
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require.Len(t, txt.Txt, 1)
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require.Equal(t, "key=value", txt.Txt[0])
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// Re-do the query, but specify the DC
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m = new(dns.Msg)
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m.SetQuestion("foo.node.dc1.consul.", dns.TypeANY)
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c = new(dns.Client)
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in, _, err = c.Exchange(m, a.DNSAddr())
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require.NoError(t, err)
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require.Len(t, in.Answer, 2)
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require.Len(t, in.Extra, 0)
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aRec, ok = in.Answer[0].(*dns.A)
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require.True(t, ok, "First answer is not an A record")
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require.Equal(t, "127.0.0.1", aRec.A.String())
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require.Equal(t, uint32(0), aRec.Hdr.Ttl)
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_, ok = in.Answer[1].(*dns.TXT)
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require.True(t, ok, "Second answer is not a TXT record")
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// lookup a non-existing node, we should receive a SOA
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m = new(dns.Msg)
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m.SetQuestion("nofoo.node.dc1.consul.", dns.TypeANY)
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c = new(dns.Client)
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in, _, err = c.Exchange(m, a.DNSAddr())
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require.NoError(t, err)
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require.Len(t, in.Ns, 1)
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soaRec, ok := in.Ns[0].(*dns.SOA)
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require.True(t, ok, "NS RR is not a SOA record")
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require.Equal(t, uint32(0), soaRec.Hdr.Ttl)
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})
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}
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}
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func TestDNS_NodeLookup_CaseInsensitive(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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// Register node
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "Foo",
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Address: "127.0.0.1",
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("fOO.node.dc1.consul.", dns.TypeANY)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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if len(in.Answer) != 1 {
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t.Fatalf("empty lookup: %#v", in)
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}
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})
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}
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}
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// V2 DNS does not support node names with a period. This will be deprecated.
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func TestDNS_NodeLookup_PeriodName(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(false) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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// Register node with period in name
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "foo.bar",
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Address: "127.0.0.1",
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("foo.bar.node.consul.", dns.TypeANY)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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if len(in.Answer) != 1 {
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t.Fatalf("Bad: %#v", in)
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}
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aRec, ok := in.Answer[0].(*dns.A)
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if !ok {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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if aRec.A.String() != "127.0.0.1" {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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})
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}
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}
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func TestDNS_NodeLookup_AAAA(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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// Register node
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "bar",
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Address: "::4242:4242",
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("bar.node.consul.", dns.TypeAAAA)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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if len(in.Answer) != 1 {
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t.Fatalf("Bad: %#v", in)
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}
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aRec, ok := in.Answer[0].(*dns.AAAA)
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if !ok {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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if aRec.AAAA.String() != "::4242:4242" {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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if aRec.Hdr.Ttl != 0 {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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})
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}
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}
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func TestDNS_NodeLookup_CNAME(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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recursor := makeRecursor(t, dns.Msg{
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Answer: []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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dnsTXT("google.com", []string{"my_txt_value"}),
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},
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})
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defer recursor.Shutdown()
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, `
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recursors = ["`+recursor.Addr+`"]
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`+experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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// Register node
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "google",
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Address: "www.google.com",
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("google.node.consul.", dns.TypeANY)
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m.SetEdns0(8192, true)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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wantAnswer := []dns.RR{
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&dns.CNAME{
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Hdr: dns.RR_Header{Name: "google.node.consul.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: 0, Rdlength: 0x10},
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Target: "www.google.com.",
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},
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&dns.CNAME{
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Hdr: dns.RR_Header{Name: "www.google.com.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Rdlength: 0x2},
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Target: "google.com.",
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},
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&dns.A{
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Hdr: dns.RR_Header{Name: "google.com.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
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A: []byte{0x1, 0x2, 0x3, 0x4}, // 1.2.3.4
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},
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&dns.TXT{
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Hdr: dns.RR_Header{Name: "google.com.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Rdlength: 0xd},
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Txt: []string{"my_txt_value"},
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},
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}
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require.Equal(t, wantAnswer, in.Answer)
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})
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}
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}
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func TestDNS_NodeLookup_TXT(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "google",
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Address: "127.0.0.1",
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NodeMeta: map[string]string{
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"rfc1035-00": "value0",
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"key0": "value1",
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},
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("google.node.consul.", dns.TypeTXT)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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// Should have the 1 TXT record reply
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if len(in.Answer) != 2 {
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t.Fatalf("Bad: %#v", in)
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}
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txtRec, ok := in.Answer[0].(*dns.TXT)
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if !ok {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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if len(txtRec.Txt) != 1 {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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if txtRec.Txt[0] != "value0" && txtRec.Txt[0] != "key0=value1" {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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})
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}
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}
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func TestDNS_NodeLookup_TXT_DontSuppress(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, `dns_config = { enable_additional_node_meta_txt = false } `+experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "google",
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Address: "127.0.0.1",
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NodeMeta: map[string]string{
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"rfc1035-00": "value0",
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"key0": "value1",
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},
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("google.node.consul.", dns.TypeTXT)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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// Should have the 1 TXT record reply
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if len(in.Answer) != 2 {
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t.Fatalf("Bad: %#v", in)
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}
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txtRec, ok := in.Answer[0].(*dns.TXT)
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if !ok {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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if len(txtRec.Txt) != 1 {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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if txtRec.Txt[0] != "value0" && txtRec.Txt[0] != "key0=value1" {
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t.Fatalf("Bad: %#v", in.Answer[0])
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}
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})
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}
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}
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func TestDNS_NodeLookup_ANY(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: "bar",
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Address: "127.0.0.1",
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NodeMeta: map[string]string{
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"key": "value",
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},
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}
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var out struct{}
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if err := a.RPC(context.Background(), "Catalog.Register", args, &out); err != nil {
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t.Fatalf("err: %v", err)
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}
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m := new(dns.Msg)
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m.SetQuestion("bar.node.consul.", dns.TypeANY)
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c := new(dns.Client)
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in, _, err := c.Exchange(m, a.DNSAddr())
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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wantAnswer := []dns.RR{
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&dns.A{
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Hdr: dns.RR_Header{Name: "bar.node.consul.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
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A: []byte{0x7f, 0x0, 0x0, 0x1}, // 127.0.0.1
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},
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&dns.TXT{
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Hdr: dns.RR_Header{Name: "bar.node.consul.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Rdlength: 0xa},
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Txt: []string{"key=value"},
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},
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}
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require.Equal(t, wantAnswer, in.Answer)
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})
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}
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}
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func TestDNS_NodeLookup_ANY_DontSuppressTXT(t *testing.T) {
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if testing.Short() {
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t.Skip("too slow for testing.Short")
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}
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for name, experimentsHCL := range getVersionHCL(true) {
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t.Run(name, func(t *testing.T) {
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a := NewTestAgent(t, `dns_config = { enable_additional_node_meta_txt = false } `+experimentsHCL)
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defer a.Shutdown()
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testrpc.WaitForLeader(t, a.RPC, "dc1")
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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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)
|
|
})
|
|
}
|
|
}
|
|
|
|
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])
|
|
}
|
|
})
|
|
}
|
|
}
|