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open-consul/agent/dns_test.go
Matt Keeler a34f8c751e
Pass a testing.T into NewTestAgent and TestAgent.Start (#5342) 
This way we can avoid unnecessary panics which cause other tests not to run.

This doesn't remove all the possibilities for panics causing other tests not to run, it just fixes the TestAgent
2019-02-14 10:59:14 -05:00

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package agent
import (
"fmt"
"math/rand"
"net"
"reflect"
"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/testrpc"
"github.com/hashicorp/consul/testutil/retry"
"github.com/hashicorp/serf/coordinate"
"github.com/miekg/dns"
"github.com/pascaldekloe/goe/verify"
"github.com/stretchr/testify/assert"
"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 != "db.service.consul." {
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 != "db.service.consul." {
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 != "db.service.custom." {
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.CNAME{
Hdr: dns.RR_Header{Name: "foo.node.dc1.consul.", Rrtype: 0x5, Class: 0x1, Rdlength: 0x2},
Target: "db.service.consul.",
},
&dns.A{
Hdr: dns.RR_Header{Name: "db.service.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()
assert := assert.New(t)
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{}
assert.Nil(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())
assert.Nil(err)
assert.Len(in.Answer, 1)
srvRec, ok := in.Answer[0].(*dns.SRV)
assert.True(ok)
assert.Equal(uint16(12345), srvRec.Port)
assert.Equal("foo.node.dc1.consul.", srvRec.Target)
assert.Equal(uint32(0), srvRec.Hdr.Ttl)
cnameRec, ok := in.Extra[0].(*dns.A)
assert.True(ok)
assert.Equal("foo.node.dc1.consul.", cnameRec.Hdr.Name)
assert.Equal(uint32(0), srvRec.Hdr.Ttl)
assert.Equal("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 != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
cnameRec, ok := in.Extra[0].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Target != "www.google.com." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_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 != "alias.node.dc1.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.node.dc1.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_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 != "alias2.node.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if len(in.Extra) != 3 {
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 != "alias2.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Target != "alias.service.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
cnameRec, ok = in.Extra[1].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[1])
}
if cnameRec.Hdr.Name != "alias.service.consul." {
t.Fatalf("Bad: %#v", in.Extra[1])
}
if cnameRec.Target != "web.service.consul." {
t.Fatalf("Bad: %#v", in.Extra[1])
}
if cnameRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[1])
}
aRec, ok := in.Extra[2].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[2])
}
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[2])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[2])
}
}
}
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_CNAME(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 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 != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", srvRec)
}
if srvRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
cnameRec, ok := in.Extra[0].(*dns.CNAME)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Hdr.Name != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Target != "www.google.com." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if cnameRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
}
func TestDNS_ServiceLookup_ServiceAddressIPV6(t *testing.T) {
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_WanAddress(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 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",
},
},
}
if err := a2.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// 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 := a1.config.DNSAddrs[0]
in, _, err := c.Exchange(m, addr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "7f000002.addr.dc2.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.2" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
// Also check the A record directly
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeA)
c := new(dns.Client)
addr := a1.config.DNSAddrs[0]
in, _, err := c.Exchange(m, addr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Answer[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.Hdr.Name != question {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.A.String() != "127.0.0.2" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
// Now query from the same DC and make sure we get the local address
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
c := new(dns.Client)
addr := a2.Config.DNSAddrs[0]
in, _, err := c.Exchange(m, addr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Extra[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.Hdr.Name != "foo.node.dc2.consul." {
t.Fatalf("Bad: %#v", in.Extra[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
// Also check the A record directly from DC2
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeA)
c := new(dns.Client)
addr := a2.Config.DNSAddrs[0]
in, _, err := c.Exchange(m, addr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
aRec, ok := in.Answer[0].(*dns.A)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.Hdr.Name != question {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
}
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])
}
}
}
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.WaitForLeader(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.WaitForLeader(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())
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_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_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.consul.",
"foo.service.dc1.extra.consul.",
"foo.query.dc1.extra.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_formatNodeRecord(t *testing.T) {
s := &DNSServer{}
node := &structs.Node{
Meta: map[string]string{
"key": "value",
"key2": "value2",
},
}
records, meta := s.formatNodeRecord(node, "198.18.0.1", "test.node.consul", dns.TypeA, 5*time.Minute, false, 3, false)
require.Len(t, records, 1)
require.Len(t, meta, 0)
records, meta = s.formatNodeRecord(node, "198.18.0.1", "test.node.consul", dns.TypeA, 5*time.Minute, false, 3, true)
require.Len(t, records, 1)
require.Len(t, meta, 2)
}
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