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

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package agent
import (
"fmt"
"math/rand"
"net"
"os"
"reflect"
"strings"
"testing"
"time"
"github.com/hashicorp/consul/consul/structs"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/testutil"
"github.com/miekg/dns"
)
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
)
func makeDNSServer(t *testing.T) (string, *DNSServer) {
return makeDNSServerConfig(t, nil, nil)
}
func makeDNSServerConfig(
t *testing.T,
agentFn func(c *Config),
dnsFn func(*DNSConfig)) (string, *DNSServer) {
// Create the configs and apply the functions
agentConf := nextConfig()
if agentFn != nil {
agentFn(agentConf)
}
dnsConf := &DefaultConfig().DNSConfig
if dnsFn != nil {
dnsFn(dnsConf)
}
// Add in the recursor if any
if r := agentConf.DNSRecursor; r != "" {
agentConf.DNSRecursors = append(agentConf.DNSRecursors, r)
}
// Start the server
addr, _ := agentConf.ClientListener(agentConf.Addresses.DNS, agentConf.Ports.DNS)
dir, agent := makeAgent(t, agentConf)
server, err := NewDNSServer(agent, dnsConf, agent.logOutput,
agentConf.Domain, addr.String(), agentConf.DNSRecursors)
if err != nil {
t.Fatalf("err: %v", err)
}
return dir, server
}
// 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.RR) *dns.Server {
dnsConf := nextConfig()
dnsAddr := fmt.Sprintf("%s:%d", dnsConf.Addresses.DNS, dnsConf.Ports.DNS)
mux := dns.NewServeMux()
mux.HandleFunc(".", func(resp dns.ResponseWriter, msg *dns.Msg) {
ans := &dns.Msg{Answer: answer[:]}
ans.SetReply(msg)
if err := resp.WriteMsg(ans); err != nil {
t.Fatalf("err: %s", err)
}
})
server := &dns.Server{
Addr: dnsAddr,
Net: "udp",
Handler: mux,
}
go server.ListenAndServe()
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),
}
}
func TestRecursorAddr(t *testing.T) {
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 TestDNS_NodeLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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",
},
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[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, 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.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if aRec.Hdr.Ttl != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
// 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, addr.String())
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_CaseInsensitiveNodeLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "Foo",
Address: "127.0.0.1",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
func TestDNS_NodeLookup_AAAA(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "::4242:4242",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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.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 TestDNS_NodeLookup_CNAME(t *testing.T) {
recursor := makeRecursor(t, []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
})
defer recursor.Shutdown()
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.DNSRecursor = recursor.Addr
}, nil)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "google",
Address: "www.google.com",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
// Should have the service record, CNAME record + A record
if len(in.Answer) != 3 {
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 != 0 {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
func TestDNS_ReverseLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo2",
Address: "127.0.0.2",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
srv.domain = dns.Fqdn("custom")
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo2",
Address: "127.0.0.2",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "::4242:4242",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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_ServiceLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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_ServiceLookup_ServiceAddress(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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() != "127.0.0.2" {
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) {
dir1, srv1 := makeDNSServerConfig(t,
func(c *Config) {
c.Datacenter = "dc1"
c.TranslateWanAddrs = true
}, nil)
defer os.RemoveAll(dir1)
defer srv1.Shutdown()
dir2, srv2 := makeDNSServerConfig(t, func(c *Config) {
c.Datacenter = "dc2"
c.TranslateWanAddrs = true
}, nil)
defer os.RemoveAll(dir2)
defer srv2.Shutdown()
testutil.WaitForLeader(t, srv1.agent.RPC, "dc1")
testutil.WaitForLeader(t, srv2.agent.RPC, "dc2")
// Join WAN cluster
addr := fmt.Sprintf("127.0.0.1:%d",
srv1.agent.config.Ports.SerfWan)
if _, err := srv2.agent.JoinWAN([]string{addr}); err != nil {
t.Fatalf("err: %v", err)
}
testutil.WaitForResult(
func() (bool, error) {
return len(srv1.agent.WANMembers()) > 1, nil
},
func(err error) {
t.Fatalf("Failed waiting for WAN join: %v", err)
})
// Register a remote node with a service.
{
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 := srv2.agent.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register an equivalent prepared query.
var id string
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc2",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv2.agent.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, _ := srv1.agent.config.ClientListener("", srv1.agent.config.Ports.DNS)
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() != "127.0.0.2" {
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, _ := srv1.agent.config.ClientListener("", srv1.agent.config.Ports.DNS)
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, _ := srv2.agent.config.ClientListener("", srv2.agent.config.Ports.DNS)
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, _ := srv2.agent.config.ClientListener("", srv2.agent.config.Ports.DNS)
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("v1.master.db.service.consul.", dns.TypeSRV)
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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_PreparedQueryNamePeriod(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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.A.String() != "127.0.0.1" {
t.Fatalf("Bad: %#v", in.Answer[0])
}
}
}
func TestDNS_ServiceLookup_Dedup_SRV(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
recursor := makeRecursor(t, []dns.RR{dnsA("apple.com", "1.2.3.4")})
defer recursor.Shutdown()
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.DNSRecursor = recursor.Addr
}, nil)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
m := new(dns.Msg)
m.SetQuestion("apple.com.", dns.TypeANY)
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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_RecursorTimeout(t *testing.T) {
serverClientTimeout := 3 * time.Second
testClientTimeout := serverClientTimeout + 5*time.Second
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.DNSRecursor = "10.255.255.1" // host must cause a connection|read|write timeout
}, func(c *DNSConfig) {
c.RecursorTimeout = serverClientTimeout
})
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
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}
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
start := time.Now()
in, _, err := c.Exchange(m, addr.String())
duration := time.Now().Sub(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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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: structs.HealthCritical,
},
}
var out struct{}
if err := srv.agent.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: structs.HealthCritical,
},
}
if err := srv.agent.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: structs.HealthCritical,
},
}
if err := srv.agent.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 := srv.agent.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: structs.HealthWarning,
},
}
if err := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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: structs.HealthCritical,
},
}
var out struct{}
if err := srv.agent.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: structs.HealthCritical,
},
}
if err := srv.agent.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: structs.HealthCritical,
},
}
if err := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServerConfig(t, nil, func(c *DNSConfig) {
c.OnlyPassing = true
})
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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: structs.HealthPassing,
},
}
var out struct{}
if err := srv.agent.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: structs.HealthWarning,
},
}
if err := srv.agent.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: structs.HealthCritical,
},
}
if err := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
OnlyPassing: true,
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "web",
},
},
}
if err := srv.agent.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{}{}
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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, addr.String())
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 TestDNS_ServiceLookup_Truncate(t *testing.T) {
dir, srv := makeDNSServerConfig(t, nil, func(c *DNSConfig) {
c.EnableTruncate = true
})
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "web",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
c := new(dns.Client)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServerConfig(t, nil, func(c *DNSConfig) {
c.EnableTruncate = true
})
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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 testDNS_ServiceLookup_responseLimits(t *testing.T, answerLimit int, qType uint16,
expectedService, expectedQuery, expectedQueryID int) (bool, error) {
dir, srv := makeDNSServerConfig(t, nil, func(c *DNSConfig) {
c.UDPAnswerLimit = answerLimit
})
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
c := &dns.Client{Net: "udp"}
in, _, err := c.Exchange(m, addr.String())
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", len(in.Answer), answerLimit, qType, question)
}
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", len(in.Answer), answerLimit, qType, question)
}
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", len(in.Answer), answerLimit, qType, question)
}
default:
panic("abort")
}
}
return true, nil
}
func TestDNS_ServiceLookup_AnswerLimits(t *testing.T) {
// 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 {
ok, err := testDNS_ServiceLookup_responseLimits(t, test.udpAnswerLimit, dns.TypeA, test.expectedAService, test.expectedAQuery, test.expectedAQueryID)
if !ok {
t.Errorf("Expected service A lookup %s to pass: %v", test.name, err)
}
ok, err = testDNS_ServiceLookup_responseLimits(t, test.udpAnswerLimit, dns.TypeAAAA, test.expectedAAAAService, test.expectedAAAAQuery, test.expectedAAAAQueryID)
if !ok {
t.Errorf("Expected service AAAA lookup %s to pass: %v", test.name, err)
}
ok, err = testDNS_ServiceLookup_responseLimits(t, test.udpAnswerLimit, dns.TypeANY, test.expectedANYService, test.expectedANYQuery, test.expectedANYQueryID)
if !ok {
t.Errorf("Expected service ANY lookup %s to pass: %v", test.name, err)
}
}
}
func TestDNS_ServiceLookup_CNAME(t *testing.T) {
recursor := makeRecursor(t, []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
})
defer recursor.Shutdown()
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.DNSRecursor = recursor.Addr
}, nil)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "search",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
recursor := makeRecursor(t, []dns.RR{
dnsCNAME("www.google.com", "google.com"),
dnsA("google.com", "1.2.3.4"),
})
defer recursor.Shutdown()
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.DNSRecursor = recursor.Addr
}, func(c *DNSConfig) {
c.NodeTTL = 10 * time.Second
*c.AllowStale = true
c.MaxStale = time.Second
})
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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.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 := srv.agent.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, addr.String())
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 := srv.agent.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, addr.String())
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) {
confFn := func(c *DNSConfig) {
c.ServiceTTL = map[string]time.Duration{
"db": 10 * time.Second,
"*": 5 * time.Second,
}
*c.AllowStale = true
c.MaxStale = time.Second
}
dir, srv := makeDNSServerConfig(t, nil, confFn)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node with 2 services
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 := srv.agent.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{
Service: "api",
Port: 2222,
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
srvRec, ok := in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srvRec.Hdr.Ttl != 10 {
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 != 10 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
m = new(dns.Msg)
m.SetQuestion("api.service.consul.", dns.TypeSRV)
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)
}
srvRec, ok = in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srvRec.Hdr.Ttl != 5 {
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 != 5 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
func TestDNS_PreparedQuery_TTL(t *testing.T) {
confFn := func(c *DNSConfig) {
c.ServiceTTL = map[string]time.Duration{
"db": 10 * time.Second,
"*": 5 * time.Second,
}
*c.AllowStale = true
c.MaxStale = time.Second
}
dir, srv := makeDNSServerConfig(t, nil, confFn)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register a node and 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 := srv.agent.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{
Service: "api",
Port: 2222,
},
}
if err := srv.agent.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
// Register prepared queries with and without a TTL set for "db", as
// well as one for "api".
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "db-ttl",
Service: structs.ServiceQuery{
Service: "db",
},
DNS: structs.QueryDNSOptions{
TTL: "18s",
},
},
}
var id string
if err := srv.agent.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "db-nottl",
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
args = &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "api-nottl",
Service: structs.ServiceQuery{
Service: "api",
},
},
}
if err := srv.agent.RPC("PreparedQuery.Apply", args, &id); err != nil {
t.Fatalf("err: %v", err)
}
}
// Make sure the TTL is set when requested, and overrides the agent-
// specific config since the query takes precedence.
m := new(dns.Msg)
m.SetQuestion("db-ttl.query.consul.", dns.TypeSRV)
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
srvRec, ok := in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srvRec.Hdr.Ttl != 18 {
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 != 18 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
// And the TTL should take the service-specific value from the agent's
// config otherwise.
m = new(dns.Msg)
m.SetQuestion("db-nottl.query.consul.", dns.TypeSRV)
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)
}
srvRec, ok = in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srvRec.Hdr.Ttl != 10 {
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 != 10 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
// If there's no query TTL and no service-specific value then the wild
// card value should be used.
m = new(dns.Msg)
m.SetQuestion("api-nottl.query.consul.", dns.TypeSRV)
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)
}
srvRec, ok = in.Answer[0].(*dns.SRV)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if srvRec.Hdr.Ttl != 5 {
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 != 5 {
t.Fatalf("Bad: %#v", in.Extra[0])
}
}
func TestDNS_PreparedQuery_Failover(t *testing.T) {
dir1, srv1 := makeDNSServerConfig(t, func(c *Config) {
c.Datacenter = "dc1"
c.TranslateWanAddrs = true
}, nil)
defer os.RemoveAll(dir1)
defer srv1.Shutdown()
dir2, srv2 := makeDNSServerConfig(t, func(c *Config) {
c.Datacenter = "dc2"
c.TranslateWanAddrs = true
}, nil)
defer os.RemoveAll(dir2)
defer srv2.Shutdown()
testutil.WaitForLeader(t, srv1.agent.RPC, "dc1")
testutil.WaitForLeader(t, srv2.agent.RPC, "dc2")
// Join WAN cluster.
addr := fmt.Sprintf("127.0.0.1:%d",
srv1.agent.config.Ports.SerfWan)
if _, err := srv2.agent.JoinWAN([]string{addr}); err != nil {
t.Fatalf("err: %v", err)
}
testutil.WaitForResult(
func() (bool, error) {
return len(srv1.agent.WANMembers()) > 1, nil
},
func(err error) {
t.Fatalf("Failed waiting for WAN join: %v", err)
})
// Register a remote node with a service.
{
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 := srv2.agent.RPC("Catalog.Register", args, &out); err != nil {
t.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 := srv1.agent.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)
cl_addr, _ := srv1.agent.config.ClientListener("", srv1.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, cl_addr.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 != "foo.node.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 != "foo.node.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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("_db._master.service.consul.", dns.TypeSRV)
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
m := new(dns.Msg)
m.SetQuestion("_db._tcp.service.consul.", dns.TypeSRV)
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
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)
}
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) {
confFn := func(c *Config) {
c.ACLMasterToken = "root"
c.ACLDatacenter = "dc1"
c.ACLDownPolicy = "deny"
c.ACLDefaultPolicy = "deny"
}
dir, srv := makeDNSServerConfig(t, confFn, nil)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
// Set up the DNS query
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
m := new(dns.Msg)
m.SetQuestion("foo.service.consul.", dns.TypeA)
// Query with the root token. Should get results.
srv.agent.config.ACLToken = "root"
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)
}
// Query with a non-root token without access. Should get nothing.
srv.agent.config.ACLToken = "anonymous"
in, _, err = c.Exchange(m, addr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 0 {
t.Fatalf("Bad: %#v", in)
}
}
func TestDNS_NonExistingLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
// 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, addr.String())
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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 := srv.agent.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 := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
c := new(dns.Client)
in, _, err := c.Exchange(m, addr.String())
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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
c := new(dns.Client)
in, _, err := c.Exchange(m, addr.String())
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) {
confFn := func(c *DNSConfig) {
*c.AllowStale = true
c.MaxStale = time.Second
}
dir, srv := makeDNSServerConfig(t, nil, confFn)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
m := MockPreparedQuery{}
if err := srv.agent.InjectEndpoint("PreparedQuery", &m); err != nil {
t.Fatalf("err: %v", err)
}
m.executeFn = func(args *structs.PreparedQueryExecuteRequest, reply *structs.PreparedQueryExecuteResponse) error {
// Return a response that's perpetually too stale.
reply.LastContact = 2 * time.Second
return nil
}
// 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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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.",
}
for _, question := range questions {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeSRV)
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
in, _, err := c.Exchange(m, addr.String())
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
m := MockPreparedQuery{}
if err := srv.agent.InjectEndpoint("PreparedQuery", &m); err != nil {
t.Fatalf("err: %v", err)
}
m.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 != srv.agent.config.Datacenter ||
args.Agent.Node != srv.agent.config.NodeName {
t.Fatalf("bad: %#v", args.Agent)
}
return nil
}
{
m := new(dns.Msg)
m.SetQuestion("foo.query.consul.", dns.TypeSRV)
c := new(dns.Client)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
if _, _, err := c.Exchange(m, addr.String()); err != nil {
t.Fatalf("err: %v", err)
}
}
}
func TestDNS_trimUDPResponse_NoTrim(t *testing.T) {
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"),
},
},
}
config := &DefaultConfig().DNSConfig
if trimmed := trimUDPResponse(config, resp); 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) {
config := &DefaultConfig().DNSConfig
resp, expected := &dns.Msg{}, &dns.Msg{}
for i := 0; i < config.UDPAnswerLimit+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 < config.UDPAnswerLimit {
expected.Answer = append(expected.Answer, srv)
expected.Extra = append(expected.Extra, a)
}
}
if trimmed := trimUDPResponse(config, resp); !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) {
config := &DefaultConfig().DNSConfig
resp := &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(config, resp); !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_syncExtra(t *testing.T) {
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) {
config := &DefaultConfig().DNSConfig
m := dns.Msg{}
trimUDPResponse(config, &m)
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(config, &m)
if !m.Compress {
t.Fatalf("compression should be on")
}
}
func TestDNS_Compression_Query(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.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 := srv.agent.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{
Service: structs.ServiceQuery{
Service: "db",
},
},
}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
conn, err := dns.Dial("udp", addr.String())
if err != nil {
t.Fatalf("err: %v", err)
}
// Do a manual exchange with compression on (the default).
srv.config.DisableCompression = 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.
srv.config.DisableCompression = 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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testutil.WaitForLeader(t, srv.agent.RPC, "dc1")
// Register node.
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo2",
Address: "127.0.0.2",
}
var out struct{}
if err := srv.agent.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)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
conn, err := dns.Dial("udp", addr.String())
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.
srv.config.DisableCompression = 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) {
recursor := makeRecursor(t, []dns.RR{dnsA("apple.com", "1.2.3.4")})
defer recursor.Shutdown()
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.DNSRecursor = recursor.Addr
}, nil)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
m := new(dns.Msg)
m.SetQuestion("apple.com.", dns.TypeANY)
addr, _ := srv.agent.config.ClientListener("", srv.agent.config.Ports.DNS)
conn, err := dns.Dial("udp", addr.String())
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.
srv.config.DisableCompression = 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)
}
}
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