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open-consul
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open-consul/agent/dns_test.go

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package agent
import (
"fmt"
"math/rand"
"net"
"reflect"
"sort"
"strings"
"testing"
"time"
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/sdk/testutil/retry"
"github.com/hashicorp/consul/testrpc"
"github.com/hashicorp/serf/coordinate"
"github.com/miekg/dns"
"github.com/pascaldekloe/goe/verify"
"github.com/stretchr/testify/require"
)
const (
configUDPAnswerLimit = 4
defaultNumUDPResponses = 3
testUDPTruncateLimit = 8
pctNodesWithIPv6 = 0.5
// generateNumNodes is the upper bounds for the number of hosts used
// in testing below. Generate an arbitrarily large number of hosts.
generateNumNodes = testUDPTruncateLimit * defaultNumUDPResponses * configUDPAnswerLimit
)
// makeRecursor creates a generic DNS server which always returns
// the provided reply. This is useful for mocking a DNS recursor with
// an expected result.
func makeRecursor(t *testing.T, answer dns.Msg) *dns.Server {
a := answer
mux := dns.NewServeMux()
mux.HandleFunc(".", func(resp dns.ResponseWriter, msg *dns.Msg) {
// The SetReply function sets the return code of the DNS
// query to SUCCESS
// We need a way to copy the variables not addressed
// in SetReply
answer.SetReply(msg)
answer.Rcode = a.Rcode
if err := resp.WriteMsg(&answer); err != nil {
t.Fatalf("err: %s", err)
}
})
up := make(chan struct{})
server := &dns.Server{
Addr: "127.0.0.1:0",
Net: "udp",
Handler: mux,
NotifyStartedFunc: func() { close(up) },
}
go server.ListenAndServe()
<-up
server.Addr = server.PacketConn.LocalAddr().String()
return server
}
// dnsCNAME returns a DNS CNAME record struct
func dnsCNAME(src, dest string) *dns.CNAME {
return &dns.CNAME{
Hdr: dns.RR_Header{
Name: dns.Fqdn(src),
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: dns.Fqdn(dest),
}
}
// dnsA returns a DNS A record struct
func dnsA(src, dest string) *dns.A {
return &dns.A{
Hdr: dns.RR_Header{
Name: dns.Fqdn(src),
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP(dest),
}
}
// dnsTXT returns a DNS TXT record struct
func dnsTXT(src string, txt []string) *dns.TXT {
return &dns.TXT{
Hdr: dns.RR_Header{
Name: dns.Fqdn(src),
Rrtype: dns.TypeTXT,
Class: dns.ClassINET,
},
Txt: txt,
}
}
func TestRecursorAddr(t *testing.T) {
t.Parallel()
addr, err := recursorAddr("8.8.8.8")
if err != nil {
t.Fatalf("err: %v", err)
}
if addr != "8.8.8.8:53" {
t.Fatalf("bad: %v", addr)
}
}
func TestEncodeKVasRFC1464(t *testing.T) {
// Test cases are from rfc1464
type rfc1464Test struct {
key, value, internalForm, externalForm string
}
tests := []rfc1464Test{
{"color", "blue", "color=blue", "color=blue"},
{"equation", "a=4", "equation=a=4", "equation=a=4"},
{"a=a", "true", "a`=a=true", "a`=a=true"},
{"a\\=a", "false", "a\\`=a=false", "a\\`=a=false"},
{"=", "\\=", "`==\\=", "`==\\="},
{"string", "\"Cat\"", "string=\"Cat\"", "string=\"Cat\""},
{"string2", "`abc`", "string2=``abc``", "string2=``abc``"},
{"novalue", "", "novalue=", "novalue="},
{"a b", "c d", "a b=c d", "a b=c d"},
{"abc ", "123 ", "abc` =123 ", "abc` =123 "},
// Additional tests
{" abc", " 321", "` abc= 321", "` abc= 321"},
{"`a", "b", "``a=b", "``a=b"},
}
for _, test := range tests {
answer := encodeKVasRFC1464(test.key, test.value)
verify.Values(t, "internalForm", answer, test.internalForm)
}
}
func TestDNS_Over_TCP(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
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("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)
c.Net = "tcp"
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)
}
}
func TestDNS_NodeLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
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("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)
txt, 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_CaseInsensitiveNodeLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
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("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)
}
}
func TestDNS_NodeLookup_PeriodName(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
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("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) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
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("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])
}
}
func TestDNSCycleRecursorCheck(t *testing.T) {
t.Parallel()
// Start a DNS recursor that returns a SERVFAIL
server1 := makeRecursor(t, dns.Msg{
MsgHdr: dns.MsgHdr{Rcode: dns.RcodeServerFailure},
})
// Start a DNS recursor that returns the result
defer server1.Shutdown()
server2 := makeRecursor(t, dns.Msg{
MsgHdr: dns.MsgHdr{Rcode: dns.RcodeSuccess},
Answer: []dns.RR{
dnsA("www.google.com", "172.21.45.67"),
},
})
defer server2.Shutdown()
//Mock the agent startup with the necessary configs
agent := NewTestAgent(t, t.Name(),
`recursors = ["`+server1.Addr+`", "`+server2.Addr+`"]
`)
defer agent.Shutdown()
// DNS Message init
m := new(dns.Msg)
m.SetQuestion("google.com.", dns.TypeA)
// Agent request
client := new(dns.Client)
in, _, _ := client.Exchange(m, agent.DNSAddr())
wantAnswer := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "www.google.com.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
A: []byte{0xAC, 0x15, 0x2D, 0x43}, // 172 , 21, 45, 67
},
}
verify.Values(t, "Answer", in.Answer, wantAnswer)
}
func TestDNSCycleRecursorCheckAllFail(t *testing.T) {
t.Parallel()
// Start 3 DNS recursors that returns a REFUSED status
server1 := makeRecursor(t, dns.Msg{
MsgHdr: dns.MsgHdr{Rcode: dns.RcodeRefused},
})
defer server1.Shutdown()
server2 := makeRecursor(t, dns.Msg{
MsgHdr: dns.MsgHdr{Rcode: dns.RcodeRefused},
})
defer server2.Shutdown()
server3 := makeRecursor(t, dns.Msg{
MsgHdr: dns.MsgHdr{Rcode: dns.RcodeRefused},
})
defer server3.Shutdown()
//Mock the agent startup with the necessary configs
agent := NewTestAgent(t, t.Name(),
`recursors = ["`+server1.Addr+`", "`+server2.Addr+`","`+server3.Addr+`"]
`)
defer agent.Shutdown()
// DNS dummy message initialization
m := new(dns.Msg)
m.SetQuestion("google.com.", dns.TypeA)
// Agent request
client := new(dns.Client)
in, _, _ := client.Exchange(m, agent.DNSAddr())
//Verify if we hit SERVFAIL from Consul
verify.Values(t, "Answer", in.Rcode, dns.RcodeServerFailure)
}
func TestDNS_NodeLookup_CNAME(t *testing.T) {
t.Parallel()
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()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
`)
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("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("google.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.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"},
},
}
verify.Values(t, "answer", in.Answer, wantAnswer)
}
func TestDNS_NodeLookup_TXT(t *testing.T) {
a := NewTestAgent(t, t.Name(), ``)
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("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) {
a := NewTestAgent(t, t.Name(), `dns_config = { enable_additional_node_meta_txt = false }`)
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("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) {
a := NewTestAgent(t, t.Name(), ``)
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("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"},
},
}
verify.Values(t, "answer", in.Answer, wantAnswer)
}
func TestDNS_NodeLookup_ANY_DontSuppressTXT(t *testing.T) {
a := NewTestAgent(t, t.Name(), `dns_config = { enable_additional_node_meta_txt = false }`)
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("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"},
},
}
verify.Values(t, "answer", in.Answer, wantAnswer)
}
func TestDNS_NodeLookup_A_SuppressTXT(t *testing.T) {
a := NewTestAgent(t, t.Name(), `dns_config = { enable_additional_node_meta_txt = false }`)
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("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
},
}
verify.Values(t, "answer", in.Answer, wantAnswer)
// ensure TXT RR suppression
require.Len(t, in.Extra, 0)
}
func TestDNS_EDNS0(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.2",
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetEdns0(12345, true)
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)
}
edns := in.IsEdns0()
if edns == nil {
t.Fatalf("empty edns: %#v", in)
}
if edns.UDPSize() != 12345 {
t.Fatalf("bad edns size: %d", edns.UDPSize())
}
}
func TestDNS_EDNS0_ECS(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
require.NoError(t, a.RPC("Catalog.Register", args, &out))
}
// 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",
},
},
}
require.NoError(t, a.RPC("PreparedQuery.Apply", args, &id))
}
cases := []struct {
Name string
Question string
SubnetAddr string
SourceNetmask uint8
ExpectedScope uint8
}{
{"global", "db.service.consul.", "198.18.0.1", 32, 0},
{"query", "test.query.consul.", "198.18.0.1", 32, 32},
{"query-subnet", "test.query.consul.", "198.18.0.0", 21, 21},
}
for _, tc := range cases {
t.Run(tc.Name, func(t *testing.T) {
c := new(dns.Client)
// Query the service directly - should have a globally valid scope (0)
m := new(dns.Msg)
edns := new(dns.OPT)
edns.Hdr.Name = "."
edns.Hdr.Rrtype = dns.TypeOPT
edns.SetUDPSize(12345)
edns.SetDo(true)
subnetOp := new(dns.EDNS0_SUBNET)
subnetOp.Code = dns.EDNS0SUBNET
subnetOp.Family = 1
subnetOp.SourceNetmask = tc.SourceNetmask
subnetOp.Address = net.ParseIP(tc.SubnetAddr)
edns.Option = append(edns.Option, subnetOp)
m.Extra = append(m.Extra, edns)
m.SetQuestion(tc.Question, dns.TypeA)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
require.Len(t, in.Answer, 1)
aRec, ok := in.Answer[0].(*dns.A)
require.True(t, ok)
require.Equal(t, "127.0.0.1", aRec.A.String())
optRR := in.IsEdns0()
require.NotNil(t, optRR)
require.Len(t, optRR.Option, 1)
subnet, ok := optRR.Option[0].(*dns.EDNS0_SUBNET)
require.True(t, ok)
require.Equal(t, uint16(1), subnet.Family)
require.Equal(t, tc.SourceNetmask, subnet.SourceNetmask)
// scope set to 0 for a globally valid reply
require.Equal(t, tc.ExpectedScope, subnet.SourceScope)
require.Equal(t, net.ParseIP(tc.SubnetAddr), subnet.Address)
})
}
}
func TestDNS_ReverseLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo2",
Address: "127.0.0.2",
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("2.0.0.127.in-addr.arpa.", 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)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "foo2.node.dc1.consul." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ReverseLookup_CustomDomain(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
domain = "custom"
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo2",
Address: "127.0.0.2",
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("2.0.0.127.in-addr.arpa.", 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)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "foo2.node.dc1.custom." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ReverseLookup_IPV6(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
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("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("2.4.2.4.2.4.2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.", 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)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "bar.node.dc1.consul." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceReverseLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "127.0.0.2",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("2.0.0.127.in-addr.arpa.", 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)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != serviceCanonicalDNSName("db", "dc1", "consul", nil)+"." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceReverseLookup_IPV6(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "2001:db8::1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "2001:db8::ff00:42:8329",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("9.2.3.8.2.4.0.0.0.0.f.f.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.", 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)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != serviceCanonicalDNSName("db", "dc1", "consul", nil)+"." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceReverseLookup_CustomDomain(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
domain = "custom"
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "127.0.0.2",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("2.0.0.127.in-addr.arpa.", 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)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != serviceCanonicalDNSName("db", "dc1", "custom", nil)+"." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_SOA_Settings(t *testing.T) {
t.Parallel()
testSoaWithConfig := func(config string, ttl, expire, refresh, retry uint) {
a := NewTestAgent(t, t.Name(), config)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// 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(ttl), soaRec.Minttl)
require.Equal(t, uint32(expire), soaRec.Expire)
require.Equal(t, uint32(refresh), soaRec.Refresh)
require.Equal(t, uint32(retry), soaRec.Retry)
require.Equal(t, uint32(ttl), soaRec.Hdr.Ttl)
}
// Default configuration
testSoaWithConfig("", 0, 86400, 3600, 600)
// Override all settings
testSoaWithConfig("dns_config={soa={min_ttl=60,expire=43200,refresh=1800,retry=300}}", 60, 43200, 1800, 300)
// Override partial settings
testSoaWithConfig("dns_config={soa={min_ttl=60,expire=43200}}", 60, 43200, 3600, 600)
// Override partial settings, part II
testSoaWithConfig("dns_config={soa={refresh=1800,retry=300}}", 0, 86400, 1800, 300)
}
func TestDNS_ServiceReverseLookupNodeAddress(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "127.0.0.1",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("1.0.0.127.in-addr.arpa.", 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)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceLookupNoMultiCNAME(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "198.18.0.1",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
Address: "foo.node.consul",
},
}
var out struct{}
require.NoError(t, a.RPC("Catalog.Register", args, &out))
}
// Register a second node node with the same service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "198.18.0.2",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
Address: "bar.node.consul",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("db.service.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
// expect a CNAME and an A RR
require.Len(t, in.Answer, 2)
require.IsType(t, &dns.CNAME{}, in.Answer[0])
require.IsType(t, &dns.A{}, in.Answer[1])
}
func TestDNS_ServiceLookupPreferNoCNAME(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "198.18.0.1",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
Address: "198.18.0.1",
},
}
var out struct{}
require.NoError(t, a.RPC("Catalog.Register", args, &out))
}
// Register a second node node with the same service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "198.18.0.2",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
Address: "bar.node.consul",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("db.service.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
// expect a CNAME and an A RR
require.Len(t, in.Answer, 1)
aRec, ok := in.Answer[0].(*dns.A)
require.Truef(t, ok, "Not an A RR")
require.Equal(t, "db.service.consul.", aRec.Hdr.Name)
require.Equal(t, "198.18.0.1", aRec.A.String())
}
func TestDNS_ServiceLookupMultiAddrNoCNAME(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "198.18.0.1",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
Address: "198.18.0.1",
},
}
var out struct{}
require.NoError(t, a.RPC("Catalog.Register", args, &out))
}
// Register a second node node with the same service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "198.18.0.2",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
Address: "bar.node.consul",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register a second node node with the same service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "baz",
Address: "198.18.0.3",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
Address: "198.18.0.3",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("db.service.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
// expect a CNAME and an A RR
require.Len(t, in.Answer, 2)
require.IsType(t, &dns.A{}, in.Answer[0])
require.IsType(t, &dns.A{}, in.Answer[1])
}
func TestDNS_ServiceLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.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 := a.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)
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)
}
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])
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
// Lookup a non-existing service/query, we should receive an SOA.
questions = []string{
"nodb.service.consul.",
"nope.query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Ns) != 1 {
t.Fatalf("Bad: %#v", in)
}
soaRec, ok := in.Ns[0].(*dns.SOA)
if !ok {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if soaRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Ns[0])
}
}
}
func TestDNS_ServiceLookupWithInternalServiceAddress(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
node_name = "my.test-node"
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
// The service is using the consul DNS name as service address
// which triggers a lookup loop and a subsequent stack overflow
// crash.
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Address: "db.service.consul",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
// Looking up the service should not trigger a loop
m := new(dns.Msg)
m.SetQuestion("db.service.consul.", dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAnswer := []dns.RR{
&dns.SRV{
Hdr: dns.RR_Header{Name: "db.service.consul.", Rrtype: 0x21, Class: 0x1, Rdlength: 0x1b},
Priority: 0x1,
Weight: 0x1,
Port: 12345,
Target: "foo.node.dc1.consul.",
},
}
verify.Values(t, "answer", in.Answer, wantAnswer)
wantExtra := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "foo.node.dc1.consul.", Rrtype: 0x1, Class: 0x1, Rdlength: 0x4},
A: []byte{0x7f, 0x0, 0x0, 0x1}, // 127.0.0.1
},
}
verify.Values(t, "extra", in.Extra, wantExtra)
}
func TestDNS_ConnectServiceLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register
{
args := structs.TestRegisterRequestProxy(t)
args.Address = "127.0.0.55"
args.Service.Proxy.DestinationServiceName = "db"
args.Service.Address = ""
args.Service.Port = 12345
var out struct{}
require.Nil(t, a.RPC("Catalog.Register", args, &out))
}
// Look up the service
questions := []string{
"db.connect.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.Nil(t, err)
require.Len(t, in.Answer, 1)
srvRec, ok := in.Answer[0].(*dns.SRV)
require.True(t, ok)
require.Equal(t, uint16(12345), srvRec.Port)
require.Equal(t, "foo.node.dc1.consul.", srvRec.Target)
require.Equal(t, uint32(0), srvRec.Hdr.Ttl)
cnameRec, ok := in.Extra[0].(*dns.A)
require.True(t, ok)
require.Equal(t, "foo.node.dc1.consul.", cnameRec.Hdr.Name)
require.Equal(t, uint32(0), srvRec.Hdr.Ttl)
require.Equal(t, "127.0.0.55", cnameRec.A.String())
}
}
func TestDNS_ExternalServiceLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with an external service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "www.google.com",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service
questions := []string{
"db.service.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
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 != "www.google.com." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
}
func TestDNS_InifiniteRecursion(t *testing.T) {
// This test should not create an infinite recursion
t.Parallel()
a := NewTestAgent(t, t.Name(), `
domain = "CONSUL."
node_name = "test node"
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register the initial node with a service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "web",
Address: "web.service.consul.",
Service: &structs.NodeService{
Service: "web",
Port: 12345,
Address: "web.service.consul.",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly
questions := []string{
"web.service.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeA)
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.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.Target != "web.service.consul." {
t.Fatalf("Bad: %#v, target:=%s", aRec, aRec.Target)
}
}
}
func TestDNS_ExternalServiceToConsulCNAMELookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
domain = "CONSUL."
node_name = "test node"
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register the initial node with a service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "web",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "web",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register an external service pointing to the 'web' service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "alias",
Address: "web.service.consul",
Service: &structs.NodeService{
Service: "alias",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly
questions := []string{
"alias.service.consul.",
"alias.service.CoNsUl.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
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 != "web.service.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if len(in.Extra) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "web.service.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_NSRecords(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
domain = "CONSUL."
node_name = "server1"
`)
defer a.Shutdown()
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
m := new(dns.Msg)
m.SetQuestion("something.node.consul.", dns.TypeNS)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAnswer := []dns.RR{
&dns.NS{
Hdr: dns.RR_Header{Name: "consul.", Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 0, Rdlength: 0x13},
Ns: "server1.node.dc1.consul.",
},
}
verify.Values(t, "answer", in.Answer, wantAnswer)
wantExtra := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "server1.node.dc1.consul.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4, Ttl: 0},
A: net.ParseIP("127.0.0.1").To4(),
},
}
verify.Values(t, "extra", in.Extra, wantExtra)
}
func TestDNS_NSRecords_IPV6(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
domain = "CONSUL."
node_name = "server1"
advertise_addr = "::1"
`)
defer a.Shutdown()
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
m := new(dns.Msg)
m.SetQuestion("server1.node.dc1.consul.", dns.TypeNS)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAnswer := []dns.RR{
&dns.NS{
Hdr: dns.RR_Header{Name: "consul.", Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 0, Rdlength: 0x2},
Ns: "server1.node.dc1.consul.",
},
}
verify.Values(t, "answer", in.Answer, wantAnswer)
wantExtra := []dns.RR{
&dns.AAAA{
Hdr: dns.RR_Header{Name: "server1.node.dc1.consul.", Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Rdlength: 0x10, Ttl: 0},
AAAA: net.ParseIP("::1"),
},
}
verify.Values(t, "extra", in.Extra, wantExtra)
}
func TestDNS_ExternalServiceToConsulCNAMENestedLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
node_name = "test-node"
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register the initial node with a service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "web",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "web",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register an external service pointing to the 'web' service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "alias",
Address: "web.service.consul",
Service: &structs.NodeService{
Service: "alias",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register an external service pointing to the 'alias' service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "alias2",
Address: "alias.service.consul",
Service: &structs.NodeService{
Service: "alias2",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly
questions := []string{
"alias2.service.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
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 != "alias.service.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if len(in.Extra) != 2 {
t.Fatalf("Bad: %#v", in)
}
cnameRec, ok := in.Extra[0].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Hdr.Name != "alias.service.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Target != "web.service.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
aRec, ok := in.Extra[1].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[1])
}
if aRec.Hdr.Name != "web.service.consul." {
t.Fatalf("Bad: %#v", in.Extra[1])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[1])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[1])
}
}
}
func TestDNS_ServiceLookup_ServiceAddress_A(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Address: "127.0.0.2",
Port: 12345,
},
}
var out struct{}
if err := a.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 := a.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)
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)
}
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 != "7f000002.addr.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "7f000002.addr.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.2" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_ServiceLookup_ServiceAddress_SRV(t *testing.T) {
t.Parallel()
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
},
})
defer recursor.Shutdown()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.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 := a.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 := a.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)
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)
}
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 != "www.google.com." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
// Should have google CNAME
cnRec, ok := in.Extra[0].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnRec.Target != "google.com." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
// Check we recursively resolve
aRec, ok := in.Extra[1].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[1])
}
if aRec.A.String() != "1.2.3.4" {
t.Fatalf("Bad: %s", aRec.A.String())
}
}
}
func TestDNS_ServiceLookup_ServiceAddressIPV6(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Address: "2607:20:4005:808::200e",
Port: 12345,
},
}
var out struct{}
if err := a.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 := a.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)
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)
}
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 != "2607002040050808000000000000200e.addr.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
aRec, ok := in.Extra[0].(*dns.AAAA)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "2607002040050808000000000000200e.addr.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.AAAA.String() != "2607:20:4005:808::200e" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_ServiceLookup_WanTranslation(t *testing.T) {
t.Parallel()
a1 := NewTestAgent(t, t.Name(), `
datacenter = "dc1"
translate_wan_addrs = true
acl_datacenter = ""
`)
defer a1.Shutdown()
a2 := NewTestAgent(t, t.Name(), `
datacenter = "dc2"
translate_wan_addrs = true
acl_datacenter = ""
`)
defer a2.Shutdown()
// Join WAN cluster
addr := fmt.Sprintf("127.0.0.1:%d", a1.Config.SerfPortWAN)
_, err := a2.JoinWAN([]string{addr})
require.NoError(t, err)
retry.Run(t, func(r *retry.R) {
require.Len(r, a1.WANMembers(), 2)
require.Len(r, a2.WANMembers(), 2)
})
// Register an equivalent prepared query.
var id string
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc2",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "test",
Service: structs.ServiceQuery{
Service: "db",
},
},
}
require.NoError(t, a2.RPC("PreparedQuery.Apply", args, &id))
}
type testCase struct {
nodeTaggedAddresses map[string]string
serviceAddress string
serviceTaggedAddresses map[string]structs.ServiceAddress
dnsAddr string
expectedPort uint16
expectedAddress string
expectedARRName string
}
cases := map[string]testCase{
"node-addr-from-dc1": testCase{
dnsAddr: a1.config.DNSAddrs[0].String(),
expectedPort: 8080,
expectedAddress: "127.0.0.1",
expectedARRName: "foo.node.dc2.consul.",
},
"node-wan-from-dc1": testCase{
dnsAddr: a1.config.DNSAddrs[0].String(),
nodeTaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
expectedPort: 8080,
expectedAddress: "127.0.0.2",
expectedARRName: "7f000002.addr.dc2.consul.",
},
"service-addr-from-dc1": testCase{
dnsAddr: a1.config.DNSAddrs[0].String(),
nodeTaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
serviceAddress: "10.0.1.1",
expectedPort: 8080,
expectedAddress: "10.0.1.1",
expectedARRName: "0a000101.addr.dc2.consul.",
},
"service-wan-from-dc1": testCase{
dnsAddr: a1.config.DNSAddrs[0].String(),
nodeTaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
serviceAddress: "10.0.1.1",
serviceTaggedAddresses: map[string]structs.ServiceAddress{
"wan": structs.ServiceAddress{
Address: "198.18.0.1",
Port: 80,
},
},
expectedPort: 80,
expectedAddress: "198.18.0.1",
expectedARRName: "c6120001.addr.dc2.consul.",
},
"node-addr-from-dc2": testCase{
dnsAddr: a2.config.DNSAddrs[0].String(),
expectedPort: 8080,
expectedAddress: "127.0.0.1",
expectedARRName: "foo.node.dc2.consul.",
},
"node-wan-from-dc2": testCase{
dnsAddr: a2.config.DNSAddrs[0].String(),
nodeTaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
expectedPort: 8080,
expectedAddress: "127.0.0.1",
expectedARRName: "foo.node.dc2.consul.",
},
"service-addr-from-dc2": testCase{
dnsAddr: a2.config.DNSAddrs[0].String(),
nodeTaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
serviceAddress: "10.0.1.1",
expectedPort: 8080,
expectedAddress: "10.0.1.1",
expectedARRName: "0a000101.addr.dc2.consul.",
},
"service-wan-from-dc2": testCase{
dnsAddr: a2.config.DNSAddrs[0].String(),
nodeTaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
serviceAddress: "10.0.1.1",
serviceTaggedAddresses: map[string]structs.ServiceAddress{
"wan": structs.ServiceAddress{
Address: "198.18.0.1",
Port: 80,
},
},
expectedPort: 8080,
expectedAddress: "10.0.1.1",
expectedARRName: "0a000101.addr.dc2.consul.",
},
}
for name, tc := range cases {
name := name
tc := tc
t.Run(name, func(t *testing.T) {
// Register a remote node with a service. This is in a retry since we
// need the datacenter to have a route which takes a little more time
// beyond the join, and we don't have direct access to the router here.
retry.Run(t, func(r *retry.R) {
args := &structs.RegisterRequest{
Datacenter: "dc2",
Node: "foo",
Address: "127.0.0.1",
TaggedAddresses: tc.nodeTaggedAddresses,
Service: &structs.NodeService{
Service: "db",
Address: tc.serviceAddress,
Port: 8080,
TaggedAddresses: tc.serviceTaggedAddresses,
},
}
var out struct{}
require.NoError(t, a2.RPC("Catalog.Register", args, &out))
})
// Look up the SRV record via service and prepared query.
questions := []string{
"db.service.dc2.consul.",
id + ".query.dc2.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
c := new(dns.Client)
addr := tc.dnsAddr
in, _, err := c.Exchange(m, addr)
require.NoError(t, err)
require.Len(t, in.Answer, 1)
srvRec, ok := in.Answer[0].(*dns.SRV)
require.True(t, ok, "Bad: %#v", in.Answer[0])
require.Equal(t, tc.expectedPort, srvRec.Port)
aRec, ok := in.Extra[0].(*dns.A)
require.True(t, ok, "Bad: %#v", in.Extra[0])
require.Equal(t, tc.expectedARRName, aRec.Hdr.Name)
require.Equal(t, tc.expectedAddress, aRec.A.String())
}
// Also check the A record directly
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeA)
c := new(dns.Client)
addr := tc.dnsAddr
in, _, err := c.Exchange(m, addr)
require.NoError(t, err)
require.Len(t, in.Answer, 1)
aRec, ok := in.Answer[0].(*dns.A)
require.True(t, ok, "Bad: %#v", in.Answer[0])
require.Equal(t, question, aRec.Hdr.Name)
require.Equal(t, tc.expectedAddress, aRec.A.String())
}
})
}
}
func TestDNS_CaseInsensitiveServiceLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "Db",
Tags: []string{"Master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register an equivalent prepared query, as well as a name.
var id string
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "somequery",
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Try some variations to make sure case doesn't matter.
questions := []string{
"master.db.service.consul.",
"mASTER.dB.service.consul.",
"MASTER.dB.service.consul.",
"db.service.consul.",
"DB.service.consul.",
"Db.service.consul.",
"somequery.query.consul.",
"SomeQuery.query.consul.",
"SOMEQUERY.query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
}
}
func TestDNS_ServiceLookup_TagPeriod(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"v1.master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m1 := new(dns.Msg)
m1.SetQuestion("v1.master2.db.service.consul.", dns.TypeSRV)
c1 := new(dns.Client)
in, _, err := c1.Exchange(m1, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 0 {
t.Fatalf("Bad: %#v", in)
}
m := new(dns.Msg)
m.SetQuestion("v1.master.db.service.consul.", dns.TypeSRV)
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)
}
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)
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
func TestDNS_PreparedQueryNearIPEDNS(t *testing.T) {
ipCoord := lib.GenerateCoordinate(1 * time.Millisecond)
serviceNodes := []struct {
name string
address string
coord *coordinate.Coordinate
}{
{"foo1", "198.18.0.1", lib.GenerateCoordinate(1 * time.Millisecond)},
{"foo2", "198.18.0.2", lib.GenerateCoordinate(10 * time.Millisecond)},
{"foo3", "198.18.0.3", lib.GenerateCoordinate(30 * time.Millisecond)},
}
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
added := 0
// Register nodes with a service
for _, cfg := range serviceNodes {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: cfg.name,
Address: cfg.address,
Service: &structs.NodeService{
Service: "db",
Port: 12345,
},
}
var out struct{}
err := a.RPC("Catalog.Register", args, &out)
require.NoError(t, err)
// Send coordinate updates
coordArgs := structs.CoordinateUpdateRequest{
Datacenter: "dc1",
Node: cfg.name,
Coord: cfg.coord,
}
err = a.RPC("Coordinate.Update", &coordArgs, &out)
require.NoError(t, err)
added += 1
}
fmt.Printf("Added %d service nodes\n", added)
// Register a node without a service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "198.18.0.9",
}
var out struct{}
err := a.RPC("Catalog.Register", args, &out)
require.NoError(t, err)
// Send coordinate updates for a few nodes.
coordArgs := structs.CoordinateUpdateRequest{
Datacenter: "dc1",
Node: "bar",
Coord: ipCoord,
}
err = a.RPC("Coordinate.Update", &coordArgs, &out)
require.NoError(t, err)
}
// Register a prepared query Near = _ip
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "some.query.we.like",
Service: structs.ServiceQuery{
Service: "db",
Near: "_ip",
},
},
}
var id string
err := a.RPC("PreparedQuery.Apply", args, &id)
require.NoError(t, err)
}
retry.Run(t, func(r *retry.R) {
m := new(dns.Msg)
m.SetQuestion("some.query.we.like.query.consul.", dns.TypeA)
m.SetEdns0(4096, false)
o := new(dns.OPT)
o.Hdr.Name = "."
o.Hdr.Rrtype = dns.TypeOPT
e := new(dns.EDNS0_SUBNET)
e.Code = dns.EDNS0SUBNET
e.Family = 1
e.SourceNetmask = 32
e.SourceScope = 0
e.Address = net.ParseIP("198.18.0.9").To4()
o.Option = append(o.Option, e)
m.Extra = append(m.Extra, o)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
r.Fatalf("Error with call to dns.Client.Exchange: %s", err)
}
if len(serviceNodes) != len(in.Answer) {
r.Fatalf("Expecting %d A RRs in response, Actual found was %d", len(serviceNodes), len(in.Answer))
}
for i, rr := range in.Answer {
if aRec, ok := rr.(*dns.A); ok {
if actual := aRec.A.String(); serviceNodes[i].address != actual {
r.Fatalf("Expecting A RR #%d = %s, Actual RR was %s", i, serviceNodes[i].address, actual)
}
} else {
r.Fatalf("DNS Answer contained a non-A RR")
}
}
})
}
func TestDNS_PreparedQueryNearIP(t *testing.T) {
ipCoord := lib.GenerateCoordinate(1 * time.Millisecond)
serviceNodes := []struct {
name string
address string
coord *coordinate.Coordinate
}{
{"foo1", "198.18.0.1", lib.GenerateCoordinate(1 * time.Millisecond)},
{"foo2", "198.18.0.2", lib.GenerateCoordinate(10 * time.Millisecond)},
{"foo3", "198.18.0.3", lib.GenerateCoordinate(30 * time.Millisecond)},
}
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
added := 0
// Register nodes with a service
for _, cfg := range serviceNodes {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: cfg.name,
Address: cfg.address,
Service: &structs.NodeService{
Service: "db",
Port: 12345,
},
}
var out struct{}
err := a.RPC("Catalog.Register", args, &out)
require.NoError(t, err)
// Send coordinate updates
coordArgs := structs.CoordinateUpdateRequest{
Datacenter: "dc1",
Node: cfg.name,
Coord: cfg.coord,
}
err = a.RPC("Coordinate.Update", &coordArgs, &out)
require.NoError(t, err)
added += 1
}
fmt.Printf("Added %d service nodes\n", added)
// Register a node without a service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "198.18.0.9",
}
var out struct{}
err := a.RPC("Catalog.Register", args, &out)
require.NoError(t, err)
// Send coordinate updates for a few nodes.
coordArgs := structs.CoordinateUpdateRequest{
Datacenter: "dc1",
Node: "bar",
Coord: ipCoord,
}
err = a.RPC("Coordinate.Update", &coordArgs, &out)
require.NoError(t, err)
}
// Register a prepared query Near = _ip
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "some.query.we.like",
Service: structs.ServiceQuery{
Service: "db",
Near: "_ip",
},
},
}
var id string
err := a.RPC("PreparedQuery.Apply", args, &id)
require.NoError(t, err)
}
retry.Run(t, func(r *retry.R) {
m := new(dns.Msg)
m.SetQuestion("some.query.we.like.query.consul.", dns.TypeA)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
r.Fatalf("Error with call to dns.Client.Exchange: %s", err)
}
if len(serviceNodes) != len(in.Answer) {
r.Fatalf("Expecting %d A RRs in response, Actual found was %d", len(serviceNodes), len(in.Answer))
}
for i, rr := range in.Answer {
if aRec, ok := rr.(*dns.A); ok {
if actual := aRec.A.String(); serviceNodes[i].address != actual {
r.Fatalf("Expecting A RR #%d = %s, Actual RR was %s", i, serviceNodes[i].address, actual)
}
} else {
r.Fatalf("DNS Answer contained a non-A RR")
}
}
})
}
func TestDNS_ServiceLookup_PreparedQueryNamePeriod(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register a prepared query with a period in the name.
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "some.query.we.like",
Service: structs.ServiceQuery{
Service: "db",
},
},
}
var id string
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("some.query.we.like.query.consul.", dns.TypeSRV)
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)
}
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)
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
func TestDNS_ServiceLookup_Dedup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a single node with multiple instances of a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
ID: "db2",
Service: "db",
Tags: []string{"slave"},
Port: 12345,
},
}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
ID: "db3",
Service: "db",
Tags: []string{"slave"},
Port: 12346,
},
}
if err := a.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 := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query, make sure only
// one IP is returned.
questions := []string{
"db.service.consul.",
id + ".query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, 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_ServiceLookup_Dedup_SRV(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a single node with multiple instances of a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
ID: "db2",
Service: "db",
Tags: []string{"slave"},
Port: 12345,
},
}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
ID: "db3",
Service: "db",
Tags: []string{"slave"},
Port: 12346,
},
}
if err := a.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 := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query, make sure only
// one IP is returned and two unique ports are returned.
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)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 2 {
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 && srvRec.Port != 12346 {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Target != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
srvRec, ok = in.Answer[1].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[1])
}
if srvRec.Port != 12346 && srvRec.Port != 12345 {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Port == in.Answer[0].(*dns.SRV).Port {
t.Fatalf("should be a different port")
}
if srvRec.Target != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_Recurse(t *testing.T) {
t.Parallel()
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{dnsA("apple.com", "1.2.3.4")},
})
defer recursor.Shutdown()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
m := new(dns.Msg)
m.SetQuestion("apple.com.", 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) == 0 {
t.Fatalf("Bad: %#v", in)
}
if in.Rcode != dns.RcodeSuccess {
t.Fatalf("Bad: %#v", in)
}
}
func TestDNS_Recurse_Truncation(t *testing.T) {
t.Parallel()
recursor := makeRecursor(t, dns.Msg{
MsgHdr: dns.MsgHdr{Truncated: true},
Answer: []dns.RR{dnsA("apple.com", "1.2.3.4")},
})
defer recursor.Shutdown()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
m := new(dns.Msg)
m.SetQuestion("apple.com.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != dns.ErrTruncated {
t.Fatalf("err: %v", err)
}
if in.Truncated != true {
t.Fatalf("err: message should have been truncated %v", in)
}
if len(in.Answer) == 0 {
t.Fatalf("Bad: Truncated message ignored, expected some reply %#v", in)
}
if in.Rcode != dns.RcodeSuccess {
t.Fatalf("Bad: %#v", in)
}
}
func TestDNS_RecursorTimeout(t *testing.T) {
t.Parallel()
serverClientTimeout := 3 * time.Second
testClientTimeout := serverClientTimeout + 5*time.Second
resolverAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:0")
if err != nil {
t.Error(err)
}
resolver, err := net.ListenUDP("udp", resolverAddr)
if err != nil {
t.Error(err)
}
defer resolver.Close()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+resolver.LocalAddr().String()+`"] // host must cause a connection|read|write timeout
dns_config {
recursor_timeout = "`+serverClientTimeout.String()+`"
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
m := new(dns.Msg)
m.SetQuestion("apple.com.", dns.TypeANY)
// This client calling the server under test must have a longer timeout than the one we set internally
c := &dns.Client{Timeout: testClientTimeout}
start := time.Now()
in, _, err := c.Exchange(m, a.DNSAddr())
duration := time.Since(start)
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 0 {
t.Fatalf("Bad: %#v", in)
}
if in.Rcode != dns.RcodeServerFailure {
t.Fatalf("Bad: %#v", in)
}
if duration < serverClientTimeout {
t.Fatalf("Expected the call to return after at least %f seconds but lasted only %f", serverClientTimeout.Seconds(), duration.Seconds())
}
}
func TestDNS_ServiceLookup_FilterCritical(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register nodes with health checks in various states.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "serf",
Name: "serf",
Status: api.HealthCritical,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args2 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.2",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "serf",
Name: "serf",
Status: api.HealthCritical,
},
}
if err := a.RPC("Catalog.Register", args2, &out); err != nil {
t.Fatalf("err: %v", err)
}
args3 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.2",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "db",
Name: "db",
ServiceID: "db",
Status: api.HealthCritical,
},
}
if err := a.RPC("Catalog.Register", args3, &out); err != nil {
t.Fatalf("err: %v", err)
}
args4 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "baz",
Address: "127.0.0.3",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
if err := a.RPC("Catalog.Register", args4, &out); err != nil {
t.Fatalf("err: %v", err)
}
args5 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "quux",
Address: "127.0.0.4",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "db",
Name: "db",
ServiceID: "db",
Status: api.HealthWarning,
},
}
if err := a.RPC("Catalog.Register", args5, &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 := a.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.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Only 4 and 5 are not failing, so we should get 2 answers
if len(in.Answer) != 2 {
t.Fatalf("Bad: %#v", in)
}
ips := make(map[string]bool)
for _, resp := range in.Answer {
aRec := resp.(*dns.A)
ips[aRec.A.String()] = true
}
if !ips["127.0.0.3"] {
t.Fatalf("Bad: %#v should contain 127.0.0.3 (state healthy)", in)
}
if !ips["127.0.0.4"] {
t.Fatalf("Bad: %#v should contain 127.0.0.4 (state warning)", in)
}
}
}
func TestDNS_ServiceLookup_OnlyFailing(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register nodes with all health checks in a critical state.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "serf",
Name: "serf",
Status: api.HealthCritical,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args2 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.2",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "serf",
Name: "serf",
Status: api.HealthCritical,
},
}
if err := a.RPC("Catalog.Register", args2, &out); err != nil {
t.Fatalf("err: %v", err)
}
args3 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.2",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "db",
Name: "db",
ServiceID: "db",
Status: api.HealthCritical,
},
}
if err := a.RPC("Catalog.Register", args3, &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 := a.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.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// All 3 are failing, so we should get 0 answers and an NXDOMAIN response
if len(in.Answer) != 0 {
t.Fatalf("Bad: %#v", in)
}
if in.Rcode != dns.RcodeNameError {
t.Fatalf("Bad: %#v", in)
}
}
}
func TestDNS_ServiceLookup_OnlyPassing(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
dns_config {
only_passing = true
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register nodes with health checks in various states.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "db",
Name: "db",
ServiceID: "db",
Status: api.HealthPassing,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args2 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.2",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "db",
Name: "db",
ServiceID: "db",
Status: api.HealthWarning,
},
}
if err := a.RPC("Catalog.Register", args2, &out); err != nil {
t.Fatalf("err: %v", err)
}
args3 := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "baz",
Address: "127.0.0.3",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
Check: &structs.HealthCheck{
CheckID: "db",
Name: "db",
ServiceID: "db",
Status: api.HealthCritical,
},
}
if err := a.RPC("Catalog.Register", args3, &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",
OnlyPassing: true,
},
},
}
if err := a.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.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Only 1 is passing, so we should only get 1 answer
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
resp := in.Answer[0]
aRec := resp.(*dns.A)
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
newCfg := *a.Config
newCfg.DNSOnlyPassing = false
err := a.ReloadConfig(&newCfg)
require.NoError(t, err)
// only_passing is now false. we should now get two nodes
m := new(dns.Msg)
m.SetQuestion("db.service.consul.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
require.NoError(t, err)
require.Equal(t, 2, len(in.Answer))
ips := []string{in.Answer[0].(*dns.A).A.String(), in.Answer[1].(*dns.A).A.String()}
sort.Strings(ips)
require.Equal(t, []string{"127.0.0.1", "127.0.0.2"}, ips)
}
func TestDNS_ServiceLookup_Randomize(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a large number of nodes.
for i := 0; i < generateNumNodes; i++ {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: fmt.Sprintf("foo%d", i),
Address: fmt.Sprintf("127.0.0.%d", i+1),
Service: &structs.NodeService{
Service: "web",
Port: 8000,
},
}
var out struct{}
if err := a.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: "web",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query. Ensure the
// response is randomized each time.
questions := []string{
"web.service.consul.",
id + ".query.consul.",
}
for _, question := range questions {
uniques := map[string]struct{}{}
for i := 0; i < 10; i++ {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeANY)
c := &dns.Client{Net: "udp"}
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Response length should be truncated and we should get
// an A record for each response.
if len(in.Answer) != defaultNumUDPResponses {
t.Fatalf("Bad: %#v", len(in.Answer))
}
// Collect all the names.
var names []string
for _, rec := range in.Answer {
switch v := rec.(type) {
case *dns.SRV:
names = append(names, v.Target)
case *dns.A:
names = append(names, v.A.String())
}
}
nameS := strings.Join(names, "|")
// Tally the results.
uniques[nameS] = struct{}{}
}
// Give some wiggle room. Since the responses are randomized and
// there is a finite number of combinations, requiring 0
// duplicates every test run eventually gives us failures.
if len(uniques) < 2 {
t.Fatalf("unique response ratio too low: %d/10\n%v", len(uniques), uniques)
}
}
}
func TestBinarySearch(t *testing.T) {
t.Parallel()
msgSrc := new(dns.Msg)
msgSrc.Compress = true
msgSrc.SetQuestion("redis.service.consul.", dns.TypeSRV)
for i := 0; i < 5000; i++ {
target := fmt.Sprintf("host-redis-%d-%d.test.acme.com.node.dc1.consul.", i/256, i%256)
msgSrc.Answer = append(msgSrc.Answer, &dns.SRV{Hdr: dns.RR_Header{Name: "redis.service.consul.", Class: 1, Rrtype: dns.TypeSRV, Ttl: 0x3c}, Port: 0x4c57, Target: target})
msgSrc.Extra = append(msgSrc.Extra, &dns.CNAME{Hdr: dns.RR_Header{Name: target, Class: 1, Rrtype: dns.TypeCNAME, Ttl: 0x3c}, Target: fmt.Sprintf("fx.168.%d.%d.", i/256, i%256)})
}
for _, compress := range []bool{true, false} {
for idx, maxSize := range []int{12, 256, 512, 8192, 65535} {
t.Run(fmt.Sprintf("binarySearch %d", maxSize), func(t *testing.T) {
msg := new(dns.Msg)
msgSrc.Compress = compress
msgSrc.SetQuestion("redis.service.consul.", dns.TypeSRV)
msg.Answer = msgSrc.Answer
msg.Extra = msgSrc.Extra
index := make(map[string]dns.RR, len(msg.Extra))
indexRRs(msg.Extra, index)
blen := dnsBinaryTruncate(msg, maxSize, index, true)
msg.Answer = msg.Answer[:blen]
syncExtra(index, msg)
predicted := msg.Len()
buf, err := msg.Pack()
if err != nil {
t.Error(err)
}
if predicted < len(buf) {
t.Fatalf("Bug in DNS library: %d != %d", predicted, len(buf))
}
if len(buf) > maxSize || (idx != 0 && len(buf) < 16) {
t.Fatalf("bad[%d]: %d > %d", idx, len(buf), maxSize)
}
})
}
}
}
func TestDNS_TCP_and_UDP_Truncate(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
dns_config {
enable_truncate = true
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
services := []string{"normal", "truncated"}
for index, service := range services {
numServices := (index * 5000) + 2
for i := 1; i < numServices; i++ {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: fmt.Sprintf("%s-%d.acme.com", service, i),
Address: fmt.Sprintf("127.%d.%d.%d", 0, (i / 255), i%255),
Service: &structs.NodeService{
Service: service,
Port: 8000,
},
}
var out struct{}
if err := a.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: service,
Service: structs.ServiceQuery{
Service: service,
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query. Ensure the
// response is truncated each time.
questions := []string{
fmt.Sprintf("%s.service.consul.", service),
id + ".query.consul.",
}
protocols := []string{
"tcp",
"udp",
}
for _, maxSize := range []uint16{8192, 65535} {
for _, qType := range []uint16{dns.TypeANY, dns.TypeA, dns.TypeSRV} {
for _, question := range questions {
for _, protocol := range protocols {
for _, compress := range []bool{true, false} {
t.Run(fmt.Sprintf("lookup %s %s (qType:=%d) compressed=%v", question, protocol, qType, compress), func(t *testing.T) {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeANY)
maxSz := maxSize
if protocol == "udp" {
maxSz = 8192
}
m.SetEdns0(uint16(maxSz), true)
c := new(dns.Client)
c.Net = protocol
m.Compress = compress
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil && err != dns.ErrTruncated {
t.Fatalf("err: %v", err)
}
// Check for the truncate bit
buf, err := m.Pack()
info := fmt.Sprintf("service %s question:=%s (%s) (%d total records) sz:= %d in %v",
service, question, protocol, numServices, len(in.Answer), in)
if err != nil {
t.Fatalf("Error while packing: %v ; info:=%s", err, info)
}
if len(buf) > int(maxSz) {
t.Fatalf("len(buf) := %d > maxSz=%d for %v", len(buf), maxSz, info)
}
})
}
}
}
}
}
}
}
func TestDNS_ServiceLookup_Truncate(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
dns_config {
enable_truncate = true
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a large number of nodes.
for i := 0; i < generateNumNodes; i++ {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: fmt.Sprintf("foo%d", i),
Address: fmt.Sprintf("127.0.0.%d", i+1),
Service: &structs.NodeService{
Service: "web",
Port: 8000,
},
}
var out struct{}
if err := a.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: "web",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query. Ensure the
// response is truncated each time.
questions := []string{
"web.service.consul.",
id + ".query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil && err != dns.ErrTruncated {
t.Fatalf("err: %v", err)
}
// Check for the truncate bit
if !in.Truncated {
t.Fatalf("should have truncate bit")
}
}
}
func TestDNS_ServiceLookup_LargeResponses(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
dns_config {
enable_truncate = true
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
longServiceName := "this-is-a-very-very-very-very-very-long-name-for-a-service"
// Register a lot of nodes.
for i := 0; i < 4; i++ {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: fmt.Sprintf("foo%d", i),
Address: fmt.Sprintf("127.0.0.%d", i+1),
Service: &structs.NodeService{
Service: longServiceName,
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register an equivalent prepared query.
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: longServiceName,
Service: structs.ServiceQuery{
Service: longServiceName,
Tags: []string{"master"},
},
},
}
var id string
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query.
questions := []string{
"_" + longServiceName + "._master.service.consul.",
longServiceName + ".query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil && err != dns.ErrTruncated {
t.Fatalf("err: %v", err)
}
// Make sure the response size is RFC 1035-compliant for UDP messages
if in.Len() > 512 {
t.Fatalf("Bad: %d", in.Len())
}
// We should only have two answers now
if len(in.Answer) != 2 {
t.Fatalf("Bad: %d", len(in.Answer))
}
// Make sure the ADDITIONAL section matches the ANSWER section.
if len(in.Answer) != len(in.Extra) {
t.Fatalf("Bad: %d vs. %d", len(in.Answer), len(in.Extra))
}
for i := 0; i < len(in.Answer); i++ {
srv, ok := in.Answer[i].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[i])
}
a, ok := in.Extra[i].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[i])
}
if srv.Target != a.Hdr.Name {
t.Fatalf("Bad: %#v %#v", srv, a)
}
}
// Check for the truncate bit
if !in.Truncated {
t.Fatalf("should have truncate bit")
}
}
}
func testDNSServiceLookupResponseLimits(t *testing.T, answerLimit int, qType uint16,
expectedService, expectedQuery, expectedQueryID int) (bool, error) {
a := NewTestAgent(t, t.Name(), `
node_name = "test-node"
dns_config {
udp_answer_limit = `+fmt.Sprintf("%d", answerLimit)+`
}
`)
defer a.Shutdown()
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
for i := 0; i < generateNumNodes; i++ {
nodeAddress := fmt.Sprintf("127.0.0.%d", i+1)
if rand.Float64() < pctNodesWithIPv6 {
nodeAddress = fmt.Sprintf("fe80::%d", i+1)
}
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: fmt.Sprintf("foo%d", i),
Address: nodeAddress,
Service: &structs.NodeService{
Service: "api-tier",
Port: 8080,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
return false, fmt.Errorf("err: %v", err)
}
}
var id string
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "api-tier",
Service: structs.ServiceQuery{
Service: "api-tier",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
return false, fmt.Errorf("err: %v", err)
}
}
// Look up the service directly and via prepared query.
questions := []string{
"api-tier.service.consul.",
"api-tier.query.consul.",
id + ".query.consul.",
}
for idx, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, qType)
c := &dns.Client{Net: "udp"}
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
return false, fmt.Errorf("err: %v", err)
}
switch idx {
case 0:
if (expectedService > 0 && len(in.Answer) != expectedService) ||
(expectedService < -1 && len(in.Answer) < lib.AbsInt(expectedService)) {
return false, fmt.Errorf("%d/%d answers received for type %v for %s, sz:=%d", len(in.Answer), answerLimit, qType, question, in.Len())
}
case 1:
if (expectedQuery > 0 && len(in.Answer) != expectedQuery) ||
(expectedQuery < -1 && len(in.Answer) < lib.AbsInt(expectedQuery)) {
return false, fmt.Errorf("%d/%d answers received for type %v for %s, sz:=%d", len(in.Answer), answerLimit, qType, question, in.Len())
}
case 2:
if (expectedQueryID > 0 && len(in.Answer) != expectedQueryID) ||
(expectedQueryID < -1 && len(in.Answer) < lib.AbsInt(expectedQueryID)) {
return false, fmt.Errorf("%d/%d answers received for type %v for %s, sz:=%d", len(in.Answer), answerLimit, qType, question, in.Len())
}
default:
panic("abort")
}
}
return true, nil
}
func checkDNSService(t *testing.T, generateNumNodes int, aRecordLimit int, qType uint16,
expectedResultsCount int, udpSize uint16, udpAnswerLimit int) error {
a := NewTestAgent(t, t.Name(), `
node_name = "test-node"
dns_config {
a_record_limit = `+fmt.Sprintf("%d", aRecordLimit)+`
udp_answer_limit = `+fmt.Sprintf("%d", aRecordLimit)+`
}
`)
defer a.Shutdown()
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
for i := 0; i < generateNumNodes; i++ {
nodeAddress := fmt.Sprintf("127.0.0.%d", i+1)
if rand.Float64() < pctNodesWithIPv6 {
nodeAddress = fmt.Sprintf("fe80::%d", i+1)
}
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: fmt.Sprintf("foo%d", i),
Address: nodeAddress,
Service: &structs.NodeService{
Service: "api-tier",
Port: 8080,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
return fmt.Errorf("err: %v", err)
}
}
var id string
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "api-tier",
Service: structs.ServiceQuery{
Service: "api-tier",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
return fmt.Errorf("err: %v", err)
}
}
// Look up the service directly and via prepared query.
questions := []string{
"api-tier.service.consul.",
"api-tier.query.consul.",
id + ".query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, qType)
protocol := "tcp"
if udpSize > 0 {
protocol = "udp"
}
if udpSize > 512 {
m.SetEdns0(udpSize, true)
}
c := &dns.Client{Net: protocol, UDPSize: 8192}
in, _, err := c.Exchange(m, a.DNSAddr())
t.Logf("DNS Response for %+v - %+v", m, in)
if err != nil {
return fmt.Errorf("err: %v", err)
}
if len(in.Answer) != expectedResultsCount {
return fmt.Errorf("%d/%d answers received for type %v for %s (%s)", len(in.Answer), expectedResultsCount, qType, question, protocol)
}
}
return nil
}
func TestDNS_ServiceLookup_ARecordLimits(t *testing.T) {
t.Parallel()
tests := []struct {
name string
aRecordLimit int
expectedAResults int
expectedAAAAResults int
expectedSRVResults int
numNodesTotal int
udpSize uint16
udpAnswerLimit int
}{
// UDP + EDNS
{"udp-edns-1", 1, 1, 1, 30, 30, 8192, 3},
{"udp-edns-2", 2, 2, 1, 30, 30, 8192, 3},
{"udp-edns-3", 3, 3, 1, 30, 30, 8192, 3},
{"udp-edns-4", 4, 4, 1, 30, 30, 8192, 3},
{"udp-edns-5", 5, 5, 1, 30, 30, 8192, 3},
{"udp-edns-6", 6, 6, 1, 30, 30, 8192, 3},
{"udp-edns-max", 6, 3, 3, 3, 3, 8192, 3},
// All UDP without EDNS have a limit of 2 answers due to udpAnswerLimit
// Even SRV records are limit to 2 records
{"udp-limit-1", 1, 1, 1, 1, 1, 512, 2},
{"udp-limit-2", 2, 2, 2, 2, 2, 512, 2},
// AAAA results limited by size of payload
{"udp-limit-3", 3, 2, 2, 2, 2, 512, 2},
{"udp-limit-4", 4, 2, 2, 2, 2, 512, 2},
{"udp-limit-5", 5, 2, 2, 2, 2, 512, 2},
{"udp-limit-6", 6, 2, 2, 2, 2, 512, 2},
{"udp-limit-max", 6, 2, 2, 2, 2, 512, 2},
// All UDP without EDNS and no udpAnswerLimit
// Size of records is limited by UDP payload
{"udp-1", 1, 1, 1, 1, 1, 512, 0},
{"udp-2", 2, 2, 2, 2, 2, 512, 0},
{"udp-3", 3, 2, 2, 2, 2, 512, 0},
{"udp-4", 4, 2, 2, 2, 2, 512, 0},
{"udp-5", 5, 2, 2, 2, 2, 512, 0},
{"udp-6", 6, 2, 2, 2, 2, 512, 0},
// Only 3 A and 3 SRV records on 512 bytes
{"udp-max", 6, 2, 2, 2, 2, 512, 0},
{"tcp-1", 1, 1, 1, 30, 30, 0, 0},
{"tcp-2", 2, 2, 2, 30, 30, 0, 0},
{"tcp-3", 3, 3, 3, 30, 30, 0, 0},
{"tcp-4", 4, 4, 4, 30, 30, 0, 0},
{"tcp-5", 5, 5, 5, 30, 30, 0, 0},
{"tcp-6", 6, 6, 5, 30, 30, 0, 0},
{"tcp-max", 6, 2, 2, 2, 2, 0, 0},
}
for _, test := range tests {
test := test // capture loop var
queriesLimited := []uint16{
dns.TypeA,
dns.TypeAAAA,
dns.TypeANY,
}
// All those queries should have at max queriesLimited elements
for idx, qType := range queriesLimited {
t.Run(fmt.Sprintf("ARecordLimit %d qType: %d", idx, qType), func(t *testing.T) {
t.Parallel()
err := checkDNSService(t, test.numNodesTotal, test.aRecordLimit, qType, test.expectedAResults, test.udpSize, test.udpAnswerLimit)
if err != nil {
t.Fatalf("Expected lookup %s to pass: %v", test.name, err)
}
})
}
// No limits but the size of records for SRV records, since not subject to randomization issues
t.Run("SRV lookup limitARecord", func(t *testing.T) {
t.Parallel()
err := checkDNSService(t, test.expectedSRVResults, test.aRecordLimit, dns.TypeSRV, test.numNodesTotal, test.udpSize, test.udpAnswerLimit)
if err != nil {
t.Fatalf("Expected service SRV lookup %s to pass: %v", test.name, err)
}
})
}
}
func TestDNS_ServiceLookup_AnswerLimits(t *testing.T) {
t.Parallel()
// Build a matrix of config parameters (udpAnswerLimit), and the
// length of the response per query type and question. Negative
// values imply the test must return at least the abs(value) number
// of records in the answer section. This is required because, for
// example, on OS-X and Linux, the number of answers returned in a
// 512B response is different even though both platforms are x86_64
// and using the same version of Go.
//
// TODO(sean@): Why is it not identical everywhere when using the
// same compiler?
tests := []struct {
name string
udpAnswerLimit int
expectedAService int
expectedAQuery int
expectedAQueryID int
expectedAAAAService int
expectedAAAAQuery int
expectedAAAAQueryID int
expectedANYService int
expectedANYQuery int
expectedANYQueryID int
}{
{"0", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{"1", 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
{"2", 2, 2, 2, 2, 2, 2, 2, 2, 2, 2},
{"3", 3, 3, 3, 3, 3, 3, 3, 3, 3, 3},
{"4", 4, 4, 4, 4, 4, 4, 4, 4, 4, 4},
{"5", 5, 5, 5, 5, 5, 5, 5, 5, 5, 5},
{"6", 6, 6, 6, 6, 6, 6, 5, 6, 6, -5},
{"7", 7, 7, 7, 6, 7, 7, 5, 7, 7, -5},
{"8", 8, 8, 8, 6, 8, 8, 5, 8, 8, -5},
{"9", 9, 8, 8, 6, 8, 8, 5, 8, 8, -5},
{"20", 20, 8, 8, 6, 8, 8, 5, 8, -5, -5},
{"30", 30, 8, 8, 6, 8, 8, 5, 8, -5, -5},
}
for _, test := range tests {
test := test // capture loop var
t.Run(fmt.Sprintf("A lookup %v", test), func(t *testing.T) {
t.Parallel()
ok, err := testDNSServiceLookupResponseLimits(t, test.udpAnswerLimit, dns.TypeA, test.expectedAService, test.expectedAQuery, test.expectedAQueryID)
if !ok {
t.Fatalf("Expected service A lookup %s to pass: %v", test.name, err)
}
})
t.Run(fmt.Sprintf("AAAA lookup %v", test), func(t *testing.T) {
t.Parallel()
ok, err := testDNSServiceLookupResponseLimits(t, test.udpAnswerLimit, dns.TypeAAAA, test.expectedAAAAService, test.expectedAAAAQuery, test.expectedAAAAQueryID)
if !ok {
t.Fatalf("Expected service AAAA lookup %s to pass: %v", test.name, err)
}
})
t.Run(fmt.Sprintf("ANY lookup %v", test), func(t *testing.T) {
t.Parallel()
ok, err := testDNSServiceLookupResponseLimits(t, test.udpAnswerLimit, dns.TypeANY, test.expectedANYService, test.expectedANYQuery, test.expectedANYQueryID)
if !ok {
t.Fatalf("Expected service ANY lookup %s to pass: %v", test.name, err)
}
})
}
}
func TestDNS_ServiceLookup_CNAME(t *testing.T) {
t.Parallel()
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
},
})
defer recursor.Shutdown()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a name for an address.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "google",
Address: "www.google.com",
Service: &structs.NodeService{
Service: "search",
Port: 80,
},
}
var out struct{}
if err := a.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: "search",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query.
questions := []string{
"search.service.consul.",
id + ".query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Service CNAME, google CNAME, google A record
if len(in.Answer) != 3 {
t.Fatalf("Bad: %#v", in)
}
// Should have service CNAME
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])
}
// Should have google CNAME
cnRec, ok = in.Answer[1].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[1])
}
if cnRec.Target != "google.com." {
t.Fatalf("Bad: %#v", in.Answer[1])
}
// Check we recursively resolve
if _, ok := in.Answer[2].(*dns.A); !ok {
t.Fatalf("Bad: %#v", in.Answer[2])
}
}
}
func TestDNS_ServiceLookup_ServiceAddress_CNAME(t *testing.T) {
t.Parallel()
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
},
})
defer recursor.Shutdown()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a name for an address.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "google",
Address: "1.2.3.4",
Service: &structs.NodeService{
Service: "search",
Port: 80,
Address: "www.google.com",
},
}
var out struct{}
if err := a.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: "search",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the service directly and via prepared query.
questions := []string{
"search.service.consul.",
id + ".query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Service CNAME, google CNAME, google A record
if len(in.Answer) != 3 {
t.Fatalf("Bad: %#v", in)
}
// Should have service CNAME
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])
}
// Should have google CNAME
cnRec, ok = in.Answer[1].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[1])
}
if cnRec.Target != "google.com." {
t.Fatalf("Bad: %#v", in.Answer[1])
}
// Check we recursively resolve
if _, ok := in.Answer[2].(*dns.A); !ok {
t.Fatalf("Bad: %#v", in.Answer[2])
}
}
}
func TestDNS_NodeLookup_TTL(t *testing.T) {
t.Parallel()
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
},
})
defer recursor.Shutdown()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
dns_config {
node_ttl = "10s"
allow_stale = true
max_stale = "1s"
}
`)
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("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("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("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])
}
}
func TestDNS_ServiceLookup_TTL(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
dns_config {
service_ttl = {
"d*" = "42s"
"db" = "10s"
"db*" = "66s"
"*" = "5s"
}
allow_stale = true
max_stale = "1s"
}
`)
defer a.Shutdown()
for idx, service := range []string{"db", "dblb", "dk", "api"} {
nodeName := fmt.Sprintf("foo%d", idx)
address := fmt.Sprintf("127.0.0.%d", idx)
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: nodeName,
Address: address,
Service: &structs.NodeService{
Service: service,
Tags: []string{"master"},
Port: 12345 + idx,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
c := new(dns.Client)
expectResult := func(dnsQuery string, expectedTTL uint32) {
t.Run(dnsQuery, func(t *testing.T) {
m := new(dns.Msg)
m.SetQuestion(dnsQuery, dns.TypeSRV)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v, len is %d", in, len(in.Answer))
}
srvRec, ok := in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srvRec.Hdr.Ttl != expectedTTL {
t.Fatalf("Bad: %#v", in.Answer[0])
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != expectedTTL {
t.Fatalf("Bad: %#v", in.Extra[0])
}
})
}
// Should have its exact TTL
expectResult("db.service.consul.", 10)
// Should match db*
expectResult("dblb.service.consul.", 66)
// Should match d*
expectResult("dk.service.consul.", 42)
// Should match *
expectResult("api.service.consul.", 5)
}
func TestDNS_PreparedQuery_TTL(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
dns_config {
service_ttl = {
"d*" = "42s"
"db" = "10s"
"db*" = "66s"
"*" = "5s"
}
allow_stale = true
max_stale = "1s"
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
for idx, service := range []string{"db", "dblb", "dk", "api"} {
nodeName := fmt.Sprintf("foo%d", idx)
address := fmt.Sprintf("127.0.0.%d", idx)
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: nodeName,
Address: address,
Service: &structs.NodeService{
Service: service,
Tags: []string{"master"},
Port: 12345 + idx,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
// Register prepared query without TTL and with TTL
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: service,
Service: structs.ServiceQuery{
Service: service,
},
},
}
var id string
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
queryTTL := fmt.Sprintf("%s-ttl", service)
args = &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: queryTTL,
Service: structs.ServiceQuery{
Service: service,
},
DNS: structs.QueryDNSOptions{
TTL: "18s",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
}
c := new(dns.Client)
expectResult := func(dnsQuery string, expectedTTL uint32) {
t.Run(dnsQuery, func(t *testing.T) {
m := new(dns.Msg)
m.SetQuestion(dnsQuery, dns.TypeSRV)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v, len is %d", in, len(in.Answer))
}
srvRec, ok := in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srvRec.Hdr.Ttl != expectedTTL {
t.Fatalf("Bad: %#v", in.Answer[0])
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != expectedTTL {
t.Fatalf("Bad: %#v", in.Extra[0])
}
})
}
// Should have its exact TTL
expectResult("db.query.consul.", 10)
expectResult("db-ttl.query.consul.", 18)
// Should match db*
expectResult("dblb.query.consul.", 66)
expectResult("dblb-ttl.query.consul.", 18)
// Should match d*
expectResult("dk.query.consul.", 42)
expectResult("dk-ttl.query.consul.", 18)
// Should be the default value
expectResult("api.query.consul.", 5)
expectResult("api-ttl.query.consul.", 18)
}
func TestDNS_PreparedQuery_Failover(t *testing.T) {
t.Parallel()
a1 := NewTestAgent(t, t.Name(), `
datacenter = "dc1"
translate_wan_addrs = true
acl_datacenter = ""
`)
defer a1.Shutdown()
a2 := NewTestAgent(t, t.Name(), `
datacenter = "dc2"
translate_wan_addrs = true
acl_datacenter = ""
`)
defer a2.Shutdown()
// Join WAN cluster.
addr := fmt.Sprintf("127.0.0.1:%d", a1.Config.SerfPortWAN)
if _, err := a2.JoinWAN([]string{addr}); err != nil {
t.Fatalf("err: %v", err)
}
retry.Run(t, func(r *retry.R) {
if got, want := len(a1.WANMembers()), 2; got < want {
r.Fatalf("got %d WAN members want at least %d", got, want)
}
if got, want := len(a2.WANMembers()), 2; got < want {
r.Fatalf("got %d WAN members want at least %d", got, want)
}
})
// Register a remote node with a service. This is in a retry since we
// need the datacenter to have a route which takes a little more time
// beyond the join, and we don't have direct access to the router here.
retry.Run(t, func(r *retry.R) {
args := &structs.RegisterRequest{
Datacenter: "dc2",
Node: "foo",
Address: "127.0.0.1",
TaggedAddresses: map[string]string{
"wan": "127.0.0.2",
},
Service: &structs.NodeService{
Service: "db",
},
}
var out struct{}
if err := a2.RPC("Catalog.Register", args, &out); err != nil {
r.Fatalf("err: %v", err)
}
})
// Register a local prepared query.
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "my-query",
Service: structs.ServiceQuery{
Service: "db",
Failover: structs.QueryDatacenterOptions{
Datacenters: []string{"dc2"},
},
},
},
}
var id string
if err := a1.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Look up the SRV record via the query.
m := new(dns.Msg)
m.SetQuestion("my-query.query.consul.", dns.TypeSRV)
c := new(dns.Client)
clAddr := a1.config.DNSAddrs[0]
in, _, err := c.Exchange(m, clAddr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
// Make sure we see the remote DC and that the address gets
// translated.
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
if in.Answer[0].Header().Name != "my-query.query.consul." {
t.Fatalf("Bad: %#v", in.Answer[0])
}
srv, ok := in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srv.Target != "7f000002.addr.dc2.consul." {
t.Fatalf("Bad: %#v", in.Answer[0])
}
a, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if a.Hdr.Name != "7f000002.addr.dc2.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if a.A.String() != "127.0.0.2" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
func TestDNS_ServiceLookup_SRV_RFC(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
questions := []string{
"_db._master.service.dc1.consul.",
"_db._master.service.consul.",
"_db._master.dc1.consul.",
"_db._master.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
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])
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_ServiceLookup_SRV_RFC_TCP_Default(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
questions := []string{
"_db._tcp.service.dc1.consul.",
"_db._tcp.service.consul.",
"_db._tcp.dc1.consul.",
"_db._tcp.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
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])
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_ServiceLookup_FilterACL(t *testing.T) {
t.Parallel()
tests := []struct {
token string
results int
}{
{"root", 1},
{"anonymous", 0},
}
for _, tt := range tests {
t.Run("ACLToken == "+tt.token, func(t *testing.T) {
a := NewTestAgent(t, t.Name(), `
acl_token = "`+tt.token+`"
acl_master_token = "root"
acl_datacenter = "dc1"
acl_down_policy = "deny"
acl_default_policy = "deny"
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a service
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "foo",
Port: 12345,
},
WriteRequest: structs.WriteRequest{Token: "root"},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
// Set up the DNS query
c := new(dns.Client)
m := new(dns.Msg)
m.SetQuestion("foo.service.consul.", dns.TypeA)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != tt.results {
t.Fatalf("Bad: %#v", in)
}
})
}
}
func TestDNS_ServiceLookup_MetaTXT(t *testing.T) {
a := NewTestAgent(t, t.Name(), `dns_config = { enable_additional_node_meta_txt = true }`)
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",
},
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("db.service.consul.", dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAdditional := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "bar.node.dc1.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.dc1.consul.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Rdlength: 0xa},
Txt: []string{"key=value"},
},
}
verify.Values(t, "additional", in.Extra, wantAdditional)
}
func TestDNS_ServiceLookup_SuppressTXT(t *testing.T) {
a := NewTestAgent(t, t.Name(), `dns_config = { enable_additional_node_meta_txt = false }`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.1",
NodeMeta: map[string]string{
"key": "value",
},
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("db.service.consul.", dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
wantAdditional := []dns.RR{
&dns.A{
Hdr: dns.RR_Header{Name: "bar.node.dc1.consul.", Rrtype: dns.TypeA, Class: dns.ClassINET, Rdlength: 0x4},
A: []byte{0x7f, 0x0, 0x0, 0x1}, // 127.0.0.1
},
}
verify.Values(t, "additional", in.Extra, wantAdditional)
}
func TestDNS_AddressLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Look up the addresses
cases := map[string]string{
"7f000001.addr.dc1.consul.": "127.0.0.1",
}
for question, answer := range cases {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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.To4().String() != answer {
t.Fatalf("Bad: %#v", aRec)
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
}
func TestDNS_AddressLookupIPV6(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Look up the addresses
cases := map[string]string{
"2607002040050808000000000000200e.addr.consul.": "2607:20:4005:808::200e",
"2607112040051808ffffffffffff200e.addr.consul.": "2607:1120:4005:1808:ffff:ffff:ffff:200e",
}
for question, answer := range cases {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
aaaaRec, ok := in.Answer[0].(*dns.AAAA)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aaaaRec.AAAA.To16().String() != answer {
t.Fatalf("Bad: %#v", aaaaRec)
}
if aaaaRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
}
func TestDNS_NonExistingLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// lookup a non-existing node, we should receive a SOA
m := new(dns.Msg)
m.SetQuestion("nonexisting.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.Ns) != 1 {
t.Fatalf("Bad: %#v %#v", in, len(in.Answer))
}
soaRec, ok := in.Ns[0].(*dns.SOA)
if !ok {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if soaRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Ns[0])
}
}
func TestDNS_NonExistingLookupEmptyAorAAAA(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a v6-only service and a v4-only service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foov6",
Address: "fe80::1",
Service: &structs.NodeService{
Service: "webv6",
Port: 8000,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foov4",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "webv4",
Port: 8000,
},
}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register equivalent prepared queries.
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "webv4",
Service: structs.ServiceQuery{
Service: "webv4",
},
},
}
var id string
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "webv6",
Service: structs.ServiceQuery{
Service: "webv6",
},
},
}
if err := a.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Check for ipv6 records on ipv4-only service directly and via the
// prepared query.
questions := []string{
"webv4.service.consul.",
"webv4.query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeAAAA)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Ns) != 1 {
t.Fatalf("Bad: %#v", in)
}
soaRec, ok := in.Ns[0].(*dns.SOA)
if !ok {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if soaRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if in.Rcode != dns.RcodeSuccess {
t.Fatalf("Bad: %#v", in)
}
}
// Check for ipv4 records on ipv6-only service directly and via the
// prepared query.
questions = []string{
"webv6.service.consul.",
"webv6.query.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeA)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Ns) != 1 {
t.Fatalf("Bad: %#v", in)
}
soaRec, ok := in.Ns[0].(*dns.SOA)
if !ok {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if soaRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if in.Rcode != dns.RcodeSuccess {
t.Fatalf("Bad: %#v", in)
}
}
}
func TestDNS_AltDomains_Service(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
alt_domain = "test-domain."
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "test-node",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
questions := []string{
"db.service.consul.",
"db.service.test-domain.",
"db.service.dc1.consul.",
"db.service.dc1.test-domain.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
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)
}
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 != "test-node.node.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "test-node.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_AltDomains_SOA(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
node_name = "test-node"
alt_domain = "test-domain."
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
questions := []string{
"test-node.node.consul.",
"test-node.node.test-domain.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSOA)
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)
}
soaRec, ok := in.Answer[0].(*dns.SOA)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if got, want := soaRec.Hdr.Name, "consul."; got != want {
t.Fatalf("SOA name invalid, got %q want %q", got, want)
}
if got, want := soaRec.Ns, "ns.consul."; got != want {
t.Fatalf("SOA ns invalid, got %q want %q", got, want)
}
}
}
func TestDNS_AltDomains_Overlap(t *testing.T) {
// this tests the domain matching logic in DNSServer when encountering more
// than one potential match (i.e. ambiguous match)
// it should select the longer matching domain when dispatching
t.Parallel()
a := NewTestAgent(t, t.Name(), `
node_name = "test-node"
alt_domain = "test.consul."
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
questions := []string{
"test-node.node.consul.",
"test-node.node.test.consul.",
"test-node.node.dc1.consul.",
"test-node.node.dc1.test.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeA)
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("failed to resolve ambiguous alt domain %q: %#v", question, in)
}
aRec, ok := in.Answer[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if got, want := aRec.A.To4().String(), "127.0.0.1"; got != want {
t.Fatalf("A ip invalid, got %v want %v", got, want)
}
}
}
func TestDNS_PreparedQuery_AllowStale(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
dns_config {
allow_stale = true
max_stale = "1s"
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
m := MockPreparedQuery{
executeFn: func(args *structs.PreparedQueryExecuteRequest, reply *structs.PreparedQueryExecuteResponse) error {
// Return a response that's perpetually too stale.
reply.LastContact = 2 * time.Second
return nil
},
}
if err := a.registerEndpoint("PreparedQuery", &m); err != nil {
t.Fatalf("err: %v", err)
}
// Make sure that the lookup terminates and results in an SOA since
// the query doesn't exist.
{
m := new(dns.Msg)
m.SetQuestion("nope.query.consul.", dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Ns) != 1 {
t.Fatalf("Bad: %#v", in)
}
soaRec, ok := in.Ns[0].(*dns.SOA)
if !ok {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if soaRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Ns[0])
}
}
}
func TestDNS_InvalidQueries(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Try invalid forms of queries that should hit the special invalid case
// of our query parser.
questions := []string{
"consul.",
"node.consul.",
"service.consul.",
"query.consul.",
"foo.node.dc1.extra.more.consul.",
"foo.service.dc1.extra.more.consul.",
"foo.query.dc1.extra.more.consul.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Ns) != 1 {
t.Fatalf("Bad: %#v", in)
}
soaRec, ok := in.Ns[0].(*dns.SOA)
if !ok {
t.Fatalf("Bad: %#v", in.Ns[0])
}
if soaRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Ns[0])
}
}
}
func TestDNS_PreparedQuery_AgentSource(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
m := MockPreparedQuery{
executeFn: func(args *structs.PreparedQueryExecuteRequest, reply *structs.PreparedQueryExecuteResponse) error {
// Check that the agent inserted its self-name and datacenter to
// the RPC request body.
if args.Agent.Datacenter != a.Config.Datacenter ||
args.Agent.Node != a.Config.NodeName {
t.Fatalf("bad: %#v", args.Agent)
}
return nil
},
}
if err := a.registerEndpoint("PreparedQuery", &m); err != nil {
t.Fatalf("err: %v", err)
}
{
m := new(dns.Msg)
m.SetQuestion("foo.query.consul.", dns.TypeSRV)
c := new(dns.Client)
if _, _, err := c.Exchange(m, a.DNSAddr()); err != nil {
t.Fatalf("err: %v", err)
}
}
}
func TestDNS_trimUDPResponse_NoTrim(t *testing.T) {
t.Parallel()
req := &dns.Msg{}
resp := &dns.Msg{
Answer: []dns.RR{
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Target: "ip-10-0-1-185.node.dc1.consul.",
},
},
Extra: []dns.RR{
&dns.A{
Hdr: dns.RR_Header{
Name: "ip-10-0-1-185.node.dc1.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("10.0.1.185"),
},
},
}
cfg := config.DefaultRuntimeConfig(`data_dir = "a" bind_addr = "127.0.0.1"`)
if trimmed := trimUDPResponse(req, resp, cfg.DNSUDPAnswerLimit); trimmed {
t.Fatalf("Bad %#v", *resp)
}
expected := &dns.Msg{
Answer: []dns.RR{
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Target: "ip-10-0-1-185.node.dc1.consul.",
},
},
Extra: []dns.RR{
&dns.A{
Hdr: dns.RR_Header{
Name: "ip-10-0-1-185.node.dc1.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("10.0.1.185"),
},
},
}
if !reflect.DeepEqual(resp, expected) {
t.Fatalf("Bad %#v vs. %#v", *resp, *expected)
}
}
func TestDNS_trimUDPResponse_TrimLimit(t *testing.T) {
t.Parallel()
cfg := config.DefaultRuntimeConfig(`data_dir = "a" bind_addr = "127.0.0.1"`)
req, resp, expected := &dns.Msg{}, &dns.Msg{}, &dns.Msg{}
for i := 0; i < cfg.DNSUDPAnswerLimit+1; i++ {
target := fmt.Sprintf("ip-10-0-1-%d.node.dc1.consul.", 185+i)
srv := &dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Target: target,
}
a := &dns.A{
Hdr: dns.RR_Header{
Name: target,
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP(fmt.Sprintf("10.0.1.%d", 185+i)),
}
resp.Answer = append(resp.Answer, srv)
resp.Extra = append(resp.Extra, a)
if i < cfg.DNSUDPAnswerLimit {
expected.Answer = append(expected.Answer, srv)
expected.Extra = append(expected.Extra, a)
}
}
if trimmed := trimUDPResponse(req, resp, cfg.DNSUDPAnswerLimit); !trimmed {
t.Fatalf("Bad %#v", *resp)
}
if !reflect.DeepEqual(resp, expected) {
t.Fatalf("Bad %#v vs. %#v", *resp, *expected)
}
}
func TestDNS_trimUDPResponse_TrimSize(t *testing.T) {
t.Parallel()
cfg := config.DefaultRuntimeConfig(`data_dir = "a" bind_addr = "127.0.0.1"`)
req, resp := &dns.Msg{}, &dns.Msg{}
for i := 0; i < 100; i++ {
target := fmt.Sprintf("ip-10-0-1-%d.node.dc1.consul.", 185+i)
srv := &dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Target: target,
}
a := &dns.A{
Hdr: dns.RR_Header{
Name: target,
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP(fmt.Sprintf("10.0.1.%d", 185+i)),
}
resp.Answer = append(resp.Answer, srv)
resp.Extra = append(resp.Extra, a)
}
// We don't know the exact trim, but we know the resulting answer
// data should match its extra data.
if trimmed := trimUDPResponse(req, resp, cfg.DNSUDPAnswerLimit); !trimmed {
t.Fatalf("Bad %#v", *resp)
}
if len(resp.Answer) == 0 || len(resp.Answer) != len(resp.Extra) {
t.Fatalf("Bad %#v", *resp)
}
for i := range resp.Answer {
srv, ok := resp.Answer[i].(*dns.SRV)
if !ok {
t.Fatalf("should be SRV")
}
a, ok := resp.Extra[i].(*dns.A)
if !ok {
t.Fatalf("should be A")
}
if srv.Target != a.Header().Name {
t.Fatalf("Bad %#v vs. %#v", *srv, *a)
}
}
}
func TestDNS_trimUDPResponse_TrimSizeEDNS(t *testing.T) {
t.Parallel()
cfg := config.DefaultRuntimeConfig(`data_dir = "a" bind_addr = "127.0.0.1"`)
req, resp := &dns.Msg{}, &dns.Msg{}
for i := 0; i < 100; i++ {
target := fmt.Sprintf("ip-10-0-1-%d.node.dc1.consul.", 150+i)
srv := &dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Target: target,
}
a := &dns.A{
Hdr: dns.RR_Header{
Name: target,
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP(fmt.Sprintf("10.0.1.%d", 150+i)),
}
resp.Answer = append(resp.Answer, srv)
resp.Extra = append(resp.Extra, a)
}
// Copy over to a new slice since we are trimming both.
reqEDNS, respEDNS := &dns.Msg{}, &dns.Msg{}
reqEDNS.SetEdns0(2048, true)
respEDNS.Answer = append(respEDNS.Answer, resp.Answer...)
respEDNS.Extra = append(respEDNS.Extra, resp.Extra...)
// Trim each response
if trimmed := trimUDPResponse(req, resp, cfg.DNSUDPAnswerLimit); !trimmed {
t.Errorf("expected response to be trimmed: %#v", resp)
}
if trimmed := trimUDPResponse(reqEDNS, respEDNS, cfg.DNSUDPAnswerLimit); !trimmed {
t.Errorf("expected edns to be trimmed: %#v", resp)
}
// Check answer lengths
if len(resp.Answer) == 0 || len(resp.Answer) != len(resp.Extra) {
t.Errorf("bad response answer length: %#v", resp)
}
if len(respEDNS.Answer) == 0 || len(respEDNS.Answer) != len(respEDNS.Extra) {
t.Errorf("bad edns answer length: %#v", resp)
}
// Due to the compression, we can't check exact equality of sizes, but we can
// make two requests and ensure that the edns one returns a larger payload
// than the non-edns0 one.
if len(resp.Answer) >= len(respEDNS.Answer) {
t.Errorf("expected edns have larger answer: %#v\n%#v", resp, respEDNS)
}
if len(resp.Extra) >= len(respEDNS.Extra) {
t.Errorf("expected edns have larger extra: %#v\n%#v", resp, respEDNS)
}
// Verify that the things point where they should
for i := range resp.Answer {
srv, ok := resp.Answer[i].(*dns.SRV)
if !ok {
t.Errorf("%d should be an SRV", i)
}
a, ok := resp.Extra[i].(*dns.A)
if !ok {
t.Errorf("%d should be an A", i)
}
if srv.Target != a.Header().Name {
t.Errorf("%d: bad %#v vs. %#v", i, srv, a)
}
}
}
func TestDNS_syncExtra(t *testing.T) {
t.Parallel()
resp := &dns.Msg{
Answer: []dns.RR{
// These two are on the same host so the redundant extra
// records should get deduplicated.
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Port: 1001,
Target: "ip-10-0-1-185.node.dc1.consul.",
},
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Port: 1002,
Target: "ip-10-0-1-185.node.dc1.consul.",
},
// This one isn't in the Consul domain so it will get a
// CNAME and then an A record from the recursor.
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Port: 1003,
Target: "demo.consul.io.",
},
// This one isn't in the Consul domain and it will get
// a CNAME and A record from a recursor that alters the
// case of the name. This proves we look up in the index
// in a case-insensitive way.
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Port: 1001,
Target: "insensitive.consul.io.",
},
// This is also a CNAME, but it'll be set up to loop to
// make sure we don't crash.
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Port: 1001,
Target: "deadly.consul.io.",
},
// This is also a CNAME, but it won't have another record.
&dns.SRV{
Hdr: dns.RR_Header{
Name: "redis-cache-redis.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
},
Port: 1001,
Target: "nope.consul.io.",
},
},
Extra: []dns.RR{
// These should get deduplicated.
&dns.A{
Hdr: dns.RR_Header{
Name: "ip-10-0-1-185.node.dc1.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("10.0.1.185"),
},
&dns.A{
Hdr: dns.RR_Header{
Name: "ip-10-0-1-185.node.dc1.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("10.0.1.185"),
},
// This is a normal CNAME followed by an A record but we
// have flipped the order. The algorithm should emit them
// in the opposite order.
&dns.A{
Hdr: dns.RR_Header{
Name: "fakeserver.consul.io.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("127.0.0.1"),
},
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "demo.consul.io.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "fakeserver.consul.io.",
},
// These differ in case to test case insensitivity.
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "INSENSITIVE.CONSUL.IO.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "Another.Server.Com.",
},
&dns.A{
Hdr: dns.RR_Header{
Name: "another.server.com.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("127.0.0.1"),
},
// This doesn't appear in the answer, so should get
// dropped.
&dns.A{
Hdr: dns.RR_Header{
Name: "ip-10-0-1-186.node.dc1.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("10.0.1.186"),
},
// These two test edge cases with CNAME handling.
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "deadly.consul.io.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "deadly.consul.io.",
},
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "nope.consul.io.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "notthere.consul.io.",
},
},
}
index := make(map[string]dns.RR)
indexRRs(resp.Extra, index)
syncExtra(index, resp)
expected := &dns.Msg{
Answer: resp.Answer,
Extra: []dns.RR{
&dns.A{
Hdr: dns.RR_Header{
Name: "ip-10-0-1-185.node.dc1.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("10.0.1.185"),
},
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "demo.consul.io.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "fakeserver.consul.io.",
},
&dns.A{
Hdr: dns.RR_Header{
Name: "fakeserver.consul.io.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("127.0.0.1"),
},
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "INSENSITIVE.CONSUL.IO.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "Another.Server.Com.",
},
&dns.A{
Hdr: dns.RR_Header{
Name: "another.server.com.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
},
A: net.ParseIP("127.0.0.1"),
},
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "deadly.consul.io.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "deadly.consul.io.",
},
&dns.CNAME{
Hdr: dns.RR_Header{
Name: "nope.consul.io.",
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
},
Target: "notthere.consul.io.",
},
},
}
if !reflect.DeepEqual(resp, expected) {
t.Fatalf("Bad %#v vs. %#v", *resp, *expected)
}
}
func TestDNS_Compression_trimUDPResponse(t *testing.T) {
t.Parallel()
cfg := config.DefaultRuntimeConfig(`data_dir = "a" bind_addr = "127.0.0.1"`)
req, m := dns.Msg{}, dns.Msg{}
trimUDPResponse(&req, &m, cfg.DNSUDPAnswerLimit)
if m.Compress {
t.Fatalf("compression should be off")
}
// The trim function temporarily turns off compression, so we need to
// make sure the setting gets restored properly.
m.Compress = true
trimUDPResponse(&req, &m, cfg.DNSUDPAnswerLimit)
if !m.Compress {
t.Fatalf("compression should be on")
}
}
func TestDNS_Compression_Query(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
},
}
var out struct{}
if err := a.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 := a.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)
conn, err := dns.Dial("udp", a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Do a manual exchange with compression on (the default).
a.DNSDisableCompression(false)
if err := conn.WriteMsg(m); err != nil {
t.Fatalf("err: %v", err)
}
p := make([]byte, dns.MaxMsgSize)
compressed, err := conn.Read(p)
if err != nil {
t.Fatalf("err: %v", err)
}
// Disable compression and try again.
a.DNSDisableCompression(true)
if err := conn.WriteMsg(m); err != nil {
t.Fatalf("err: %v", err)
}
unc, err := conn.Read(p)
if err != nil {
t.Fatalf("err: %v", err)
}
// We can't see the compressed status given the DNS API, so we
// just make sure the message is smaller to see if it's
// respecting the flag.
if compressed == 0 || unc == 0 || compressed >= unc {
t.Fatalf("'%s' doesn't look compressed: %d vs. %d", question, compressed, unc)
}
}
}
func TestDNS_Compression_ReverseLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register node.
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo2",
Address: "127.0.0.2",
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("2.0.0.127.in-addr.arpa.", dns.TypeANY)
conn, err := dns.Dial("udp", a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Do a manual exchange with compression on (the default).
if err := conn.WriteMsg(m); err != nil {
t.Fatalf("err: %v", err)
}
p := make([]byte, dns.MaxMsgSize)
compressed, err := conn.Read(p)
if err != nil {
t.Fatalf("err: %v", err)
}
// Disable compression and try again.
a.DNSDisableCompression(true)
if err := conn.WriteMsg(m); err != nil {
t.Fatalf("err: %v", err)
}
unc, err := conn.Read(p)
if err != nil {
t.Fatalf("err: %v", err)
}
// We can't see the compressed status given the DNS API, so we just make
// sure the message is smaller to see if it's respecting the flag.
if compressed == 0 || unc == 0 || compressed >= unc {
t.Fatalf("doesn't look compressed: %d vs. %d", compressed, unc)
}
}
func TestDNS_Compression_Recurse(t *testing.T) {
t.Parallel()
recursor := makeRecursor(t, dns.Msg{
Answer: []dns.RR{dnsA("apple.com", "1.2.3.4")},
})
defer recursor.Shutdown()
a := NewTestAgent(t, t.Name(), `
recursors = ["`+recursor.Addr+`"]
`)
defer a.Shutdown()
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
m := new(dns.Msg)
m.SetQuestion("apple.com.", dns.TypeANY)
conn, err := dns.Dial("udp", a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
// Do a manual exchange with compression on (the default).
if err := conn.WriteMsg(m); err != nil {
t.Fatalf("err: %v", err)
}
p := make([]byte, dns.MaxMsgSize)
compressed, err := conn.Read(p)
if err != nil {
t.Fatalf("err: %v", err)
}
// Disable compression and try again.
a.DNSDisableCompression(true)
if err := conn.WriteMsg(m); err != nil {
t.Fatalf("err: %v", err)
}
unc, err := conn.Read(p)
if err != nil {
t.Fatalf("err: %v", err)
}
// We can't see the compressed status given the DNS API, so we just make
// sure the message is smaller to see if it's respecting the flag.
if compressed == 0 || unc == 0 || compressed >= unc {
t.Fatalf("doesn't look compressed: %d vs. %d", compressed, unc)
}
}
func TestDNSInvalidRegex(t *testing.T) {
tests := []struct {
desc string
in string
invalid bool
}{
{"Valid Hostname", "testnode", false},
{"Valid Hostname", "test-node", false},
{"Invalid Hostname with special chars", "test#$$!node", true},
{"Invalid Hostname with special chars in the end", "testnode%^", true},
{"Whitespace", " ", true},
{"Only special chars", "./$", true},
}
for _, test := range tests {
t.Run(test.desc, func(t *testing.T) {
if got, want := InvalidDnsRe.MatchString(test.in), test.invalid; got != want {
t.Fatalf("Expected %v to return %v", test.in, want)
}
})
}
}
func TestDNS_ConfigReload(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), `
recursors = ["8.8.8.8:53"]
dns_config = {
allow_stale = false
max_stale = "20s"
node_ttl = "10s"
service_ttl = {
"my_services*" = "5s"
"my_specific_service" = "30s"
}
enable_truncate = false
only_passing = false
recursor_timeout = "15s"
disable_compression = false
a_record_limit = 1
enable_additional_node_meta_txt = false
soa = {
refresh = 1
retry = 2
expire = 3
min_ttl = 4
}
}
`)
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
for _, s := range a.dnsServers {
cfg := s.config.Load().(*dnsConfig)
require.Equal(t, []string{"8.8.8.8:53"}, cfg.Recursors)
require.False(t, cfg.AllowStale)
require.Equal(t, 20*time.Second, cfg.MaxStale)
require.Equal(t, 10*time.Second, cfg.NodeTTL)
ttl, _ := cfg.GetTTLForService("my_services_1")
require.Equal(t, 5*time.Second, ttl)
ttl, _ = cfg.GetTTLForService("my_specific_service")
require.Equal(t, 30*time.Second, ttl)
require.False(t, cfg.EnableTruncate)
require.False(t, cfg.OnlyPassing)
require.Equal(t, 15*time.Second, cfg.RecursorTimeout)
require.False(t, cfg.DisableCompression)
require.Equal(t, 1, cfg.ARecordLimit)
require.False(t, cfg.NodeMetaTXT)
require.Equal(t, uint32(1), cfg.SOAConfig.Refresh)
require.Equal(t, uint32(2), cfg.SOAConfig.Retry)
require.Equal(t, uint32(3), cfg.SOAConfig.Expire)
require.Equal(t, uint32(4), cfg.SOAConfig.Minttl)
}
newCfg := *a.Config
newCfg.DNSRecursors = []string{"1.1.1.1:53"}
newCfg.DNSAllowStale = true
newCfg.DNSMaxStale = 21 * time.Second
newCfg.DNSNodeTTL = 11 * time.Second
newCfg.DNSServiceTTL = map[string]time.Duration{
"2_my_services*": 6 * time.Second,
"2_my_specific_service": 31 * time.Second,
}
newCfg.DNSEnableTruncate = true
newCfg.DNSOnlyPassing = true
newCfg.DNSRecursorTimeout = 16 * time.Second
newCfg.DNSDisableCompression = true
newCfg.DNSARecordLimit = 2
newCfg.DNSNodeMetaTXT = true
newCfg.DNSSOA.Refresh = 10
newCfg.DNSSOA.Retry = 20
newCfg.DNSSOA.Expire = 30
newCfg.DNSSOA.Minttl = 40
err := a.ReloadConfig(&newCfg)
require.NoError(t, err)
for _, s := range a.dnsServers {
cfg := s.config.Load().(*dnsConfig)
require.Equal(t, []string{"1.1.1.1:53"}, cfg.Recursors)
require.True(t, cfg.AllowStale)
require.Equal(t, 21*time.Second, cfg.MaxStale)
require.Equal(t, 11*time.Second, cfg.NodeTTL)
ttl, _ := cfg.GetTTLForService("my_services_1")
require.Equal(t, time.Duration(0), ttl)
ttl, _ = cfg.GetTTLForService("2_my_services_1")
require.Equal(t, 6*time.Second, ttl)
ttl, _ = cfg.GetTTLForService("my_specific_service")
require.Equal(t, time.Duration(0), ttl)
ttl, _ = cfg.GetTTLForService("2_my_specific_service")
require.Equal(t, 31*time.Second, ttl)
require.True(t, cfg.EnableTruncate)
require.True(t, cfg.OnlyPassing)
require.Equal(t, 16*time.Second, cfg.RecursorTimeout)
require.True(t, cfg.DisableCompression)
require.Equal(t, 2, cfg.ARecordLimit)
require.True(t, cfg.NodeMetaTXT)
require.Equal(t, uint32(10), cfg.SOAConfig.Refresh)
require.Equal(t, uint32(20), cfg.SOAConfig.Retry)
require.Equal(t, uint32(30), cfg.SOAConfig.Expire)
require.Equal(t, uint32(40), cfg.SOAConfig.Minttl)
}
}
func TestDNS_ReloadConfig_DuringQuery(t *testing.T) {
t.Parallel()
a := NewTestAgent(t, t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
m := MockPreparedQuery{
executeFn: func(args *structs.PreparedQueryExecuteRequest, reply *structs.PreparedQueryExecuteResponse) error {
time.Sleep(100 * time.Millisecond)
reply.Nodes = structs.CheckServiceNodes{
{
Node: &structs.Node{
ID: "my_node",
Address: "127.0.0.1",
},
Service: &structs.NodeService{
Address: "127.0.0.1",
Port: 8080,
},
},
}
return nil
},
}
err := a.registerEndpoint("PreparedQuery", &m)
require.NoError(t, err)
{
m := new(dns.Msg)
m.SetQuestion("nope.query.consul.", dns.TypeA)
timeout := time.NewTimer(time.Second)
res := make(chan *dns.Msg)
errs := make(chan error)
go func() {
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
errs <- err
return
}
res <- in
}()
time.Sleep(50 * time.Millisecond)
// reload the config halfway through, that should not affect the ongoing query
newCfg := *a.Config
newCfg.DNSAllowStale = true
a.ReloadConfig(&newCfg)
select {
case in := <-res:
require.Equal(t, "127.0.0.1", in.Answer[0].(*dns.A).A.String())
case err := <-errs:
require.NoError(t, err)
case <-timeout.C:
require.FailNow(t, "timeout")
}
}
}
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