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open-consul/command/agent/dns_test.go
Frank Schroeder 9f8f258d4d Remove duplicate constants 
This patch removes duplicate internal copies of constants in the structs
package which are also defined in the api package. The api.KVOp type
with all its values for the TXN endpoint and the api.HealthXXX constants
are now used throughout the codebase.

This resulted in some circular dependencies in the testutil package
which have been resolved by copying code and constants and moving the
WaitForLeader function into a separate testrpc package.
2017-04-20 09:54:49 -07:00

4624 lines
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package agent
import (
"fmt"
"math/rand"
"net"
"os"
"reflect"
"strings"
"testing"
"time"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/consul/structs"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/testrpc"
"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
}
func makeRecursorWithMessage(t *testing.T, answer dns.Msg) *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) {
answer.SetReply(msg)
if err := resp.WriteMsg(&answer); 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()
testrpc.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()
testrpc.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()
testrpc.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()
testrpc.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()
testrpc.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()
testrpc.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")
testrpc.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()
testrpc.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()
testrpc.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{
Name: "test",
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_ExternalServiceLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.WaitForLeader(t, srv.agent.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 := srv.agent.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)
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])
}
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_ExternalServiceToConsulCNAMELookup(t *testing.T) {
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.Domain = "CONSUL."
}, nil)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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)
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 != "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_ExternalServiceToConsulCNAMENestedLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.WaitForLeader(t, srv.agent.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 := srv.agent.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 := srv.agent.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 := srv.agent.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)
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 != "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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.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{
Name: "test",
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 != "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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.WaitForLeader(t, srv.agent.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 := 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{
Name: "test",
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])
}
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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.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: "2607:20:4005:808::200e",
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{
Name: "test",
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 != "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) {
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()
testrpc.WaitForLeader(t, srv1.agent.RPC, "dc1")
testrpc.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)
}
if err := testrpc.WaitForResult(func() (bool, error) {
return len(srv1.agent.WANMembers()) > 1, nil
}); err != nil {
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{
Name: "test",
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 != "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, _ := 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()
testrpc.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()
testrpc.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()
testrpc.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()
testrpc.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{
Name: "test",
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()
testrpc.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{
Name: "test",
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_Recurse_Truncation(t *testing.T) {
answerMessage := dns.Msg{
MsgHdr: dns.MsgHdr{Truncated: true},
Answer: []dns.RR{dnsA("apple.com", "1.2.3.4")},
}
recursor := makeRecursorWithMessage(t, answerMessage)
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 != 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) {
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()
dir, srv := makeDNSServerConfig(t, func(c *Config) {
c.DNSRecursor = resolver.LocalAddr().String() // 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()
testrpc.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: api.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: api.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: api.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: api.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{
Name: "test",
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()
testrpc.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: api.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: api.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: api.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{
Name: "test",
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()
testrpc.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: api.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: api.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: api.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{
Name: "test",
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()
testrpc.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{
Name: "test",
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()
testrpc.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{
Name: "test",
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()
testrpc.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()
testrpc.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()
testrpc.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{
Name: "test",
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()
testrpc.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()
testrpc.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()
testrpc.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()
testrpc.WaitForLeader(t, srv1.agent.RPC, "dc1")
testrpc.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)
}
if err := testrpc.WaitForResult(func() (bool, error) {
return len(srv1.agent.WANMembers()) > 1, nil
}); err != nil {
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 != "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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.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)
}
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)
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()
testrpc.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)
}
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)
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()
testrpc.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_AddressLookup(t *testing.T) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.WaitForLeader(t, srv.agent.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)
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.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) {
dir, srv := makeDNSServer(t)
defer os.RemoveAll(dir)
defer srv.agent.Shutdown()
testrpc.WaitForLeader(t, srv.agent.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)
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)
}
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) {
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()
testrpc.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()
testrpc.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()
testrpc.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()
testrpc.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()
testrpc.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{
Name: "test",
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()
testrpc.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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