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NET-7644/NET-7634 - Implement query lookup for tagged addresses on nodes and services including WAN translation. (#20583) 

NET-7644 - Implement tagged addresses and wan translation
This commit is contained in:
John Murret 2024-02-12 12:27:25 -07:00 committed by GitHub
parent 5802080db1
commit 7e8f2e5f08
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
18 changed files with 475 additions and 332 deletions
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2
agent/agent.go
View File

@ -1145,6 +1145,8 @@ func (a *Agent) listenAndServeV2DNS() error {
Logger: a.logger,
Processor: processor,
TokenFunc: a.getTokenFunc(),
TranslateAddressFunc: a.TranslateAddress,
TranslateServiceAddressFunc: a.TranslateServiceAddress,
}
for _, addr := range a.config.DNSAddrs {

9
agent/catalog_endpoint.go
View File

@ -13,6 +13,7 @@ import (
cachetype "github.com/hashicorp/consul/agent/cache-types"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/internal/dnsutil"
)
var CatalogCounters = []prometheus.CounterDefinition{
@ -257,7 +258,7 @@ RETRY_ONCE:
}
out.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
s.agent.TranslateAddresses(args.Datacenter, out.Nodes, TranslateAddressAcceptAny)
s.agent.TranslateAddresses(args.Datacenter, out.Nodes, dnsutil.TranslateAddressAcceptAny)
// Use empty list instead of nil
if out.Nodes == nil {
@ -403,7 +404,7 @@ func (s *HTTPHandlers) catalogServiceNodes(resp http.ResponseWriter, req *http.R
}
out.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
s.agent.TranslateAddresses(args.Datacenter, out.ServiceNodes, TranslateAddressAcceptAny)
s.agent.TranslateAddresses(args.Datacenter, out.ServiceNodes, dnsutil.TranslateAddressAcceptAny)
// Use empty list instead of nil
if out.ServiceNodes == nil {
@ -457,7 +458,7 @@ RETRY_ONCE:
}
out.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
if out.NodeServices != nil {
s.agent.TranslateAddresses(args.Datacenter, out.NodeServices, TranslateAddressAcceptAny)
s.agent.TranslateAddresses(args.Datacenter, out.NodeServices, dnsutil.TranslateAddressAcceptAny)
}
// TODO: The NodeServices object in IndexedNodeServices is a pointer to
@ -521,7 +522,7 @@ RETRY_ONCE:
goto RETRY_ONCE
}
out.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
s.agent.TranslateAddresses(args.Datacenter, &out.NodeServices, TranslateAddressAcceptAny)
s.agent.TranslateAddresses(args.Datacenter, &out.NodeServices, dnsutil.TranslateAddressAcceptAny)
// Use empty list instead of nil
for _, s := range out.NodeServices.Services {

8
agent/discovery/discovery.go
View File

@ -119,10 +119,18 @@ type Result struct {
Tenancy ResultTenancy
}
// TaggedAddress is used to represent a tagged address.
type TaggedAddress struct {
Name string
Address string
Port Port
}
// Location is used to represent a service, node, or workload.
type Location struct {
Name string
Address string
TaggedAddresses map[string]*TaggedAddress // Used to collect tagged addresses into A/AAAA Records
}
type DNSConfig struct {

32
agent/discovery/query_fetcher_v1.go
View File

@ -133,9 +133,11 @@ func (f *V1DataFetcher) FetchNodes(ctx Context, req *QueryPayload) ([]*Result, e
Node: &Location{
Name: n.Node,
Address: n.Address,
TaggedAddresses: makeTaggedAddressesFromStrings(n.TaggedAddresses),
},
Type: ResultTypeNode,
Metadata: n.Meta,
Tenancy: ResultTenancy{
// Namespace is not required because nodes are not namespaced
Partition: n.GetEnterpriseMeta().PartitionOrDefault(),
@ -212,6 +214,7 @@ func (f *V1DataFetcher) FetchRecordsByIp(reqCtx Context, ip net.IP) ([]*Result,
Node: &Location{
Name: n.Node,
Address: n.Address,
TaggedAddresses: makeTaggedAddressesFromStrings(n.TaggedAddresses),
},
Type: ResultTypeNode,
Tenancy: ResultTenancy{
@ -417,10 +420,12 @@ func (f *V1DataFetcher) buildResultsFromServiceNodes(nodes []structs.CheckServic
Service: &Location{
Name: n.Service.Service,
Address: n.Service.Address,
TaggedAddresses: makeTaggedAddressesFromServiceAddresses(n.Service.TaggedAddresses),
},
Node: &Location{
Name: n.Node.Node,
Address: n.Node.Address,
TaggedAddresses: makeTaggedAddressesFromStrings(n.Node.TaggedAddresses),
},
Type: ResultTypeService,
DNS: DNSConfig{
@ -442,6 +447,33 @@ func (f *V1DataFetcher) buildResultsFromServiceNodes(nodes []structs.CheckServic
return results
}
// makeTaggedAddressesFromServiceAddresses is used to convert a map of service addresses to a map of Locations.
func makeTaggedAddressesFromServiceAddresses(tagged map[string]structs.ServiceAddress) map[string]*TaggedAddress {
taggedAddresses := make(map[string]*TaggedAddress)
for k, v := range tagged {
taggedAddresses[k] = &TaggedAddress{
Name: k,
Address: v.Address,
Port: Port{
Number: uint32(v.Port),
},
}
}
return taggedAddresses
}
// makeTaggedAddressesFromStrings is used to convert a map of strings to a map of Locations.
func makeTaggedAddressesFromStrings(tagged map[string]string) map[string]*TaggedAddress {
taggedAddresses := make(map[string]*TaggedAddress)
for k, v := range tagged {
taggedAddresses[k] = &TaggedAddress{
Name: k,
Address: v,
}
}
return taggedAddresses
}
// fetchNode is used to look up a node in the Consul catalog within NodeServices.
// If the config is set to UseCache, it will get the record from the agent cache.
func (f *V1DataFetcher) fetchNode(cfg *v1DataFetcherDynamicConfig, args *structs.NodeSpecificRequest) (*structs.IndexedNodeServices, error) {

2
agent/discovery/query_fetcher_v1_test.go
View File

@ -142,10 +142,12 @@ func Test_FetchEndpoints(t *testing.T) {
Node: &Location{
Name: "node-name",
Address: "node-address",
TaggedAddresses: map[string]*TaggedAddress{},
},
Service: &Location{
Name: "service-name",
Address: "service-address",
TaggedAddresses: map[string]*TaggedAddress{},
},
Type: ResultTypeService,
DNS: DNSConfig{

19
agent/dns.go
View File

@ -26,6 +26,7 @@ import (
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
dnsutil "github.com/hashicorp/consul/internal/dnsutil"
libdns "github.com/hashicorp/consul/internal/dnsutil"
"github.com/hashicorp/consul/ipaddr"
"github.com/hashicorp/consul/lib"
@ -1801,13 +1802,13 @@ func makeARecord(qType uint16, ip net.IP, ttl time.Duration) dns.RR {
// In case of an SRV query the answer will be a IN SRV and additional data will store an IN A to the node IP
// Otherwise it will return a IN A record
func (d *DNSServer) makeRecordFromNode(node *structs.Node, qType uint16, qName string, ttl time.Duration, maxRecursionLevel int) []dns.RR {
addrTranslate := TranslateAddressAcceptDomain
addrTranslate := dnsutil.TranslateAddressAcceptDomain
if qType == dns.TypeA {
addrTranslate |= TranslateAddressAcceptIPv4
addrTranslate |= dnsutil.TranslateAddressAcceptIPv4
} else if qType == dns.TypeAAAA {
addrTranslate |= TranslateAddressAcceptIPv6
addrTranslate |= dnsutil.TranslateAddressAcceptIPv6
} else {
addrTranslate |= TranslateAddressAcceptAny
addrTranslate |= dnsutil.TranslateAddressAcceptAny
}
addr := d.agent.TranslateAddress(node.Datacenter, node.Address, node.TaggedAddresses, addrTranslate)
@ -1973,13 +1974,13 @@ MORE_REC:
// Craft dns records from a CheckServiceNode struct
func (d *DNSServer) makeNodeServiceRecords(lookup serviceLookup, node structs.CheckServiceNode, req *dns.Msg, ttl time.Duration, cfg *dnsConfig, maxRecursionLevel int) ([]dns.RR, []dns.RR) {
addrTranslate := TranslateAddressAcceptDomain
addrTranslate := dnsutil.TranslateAddressAcceptDomain
if req.Question[0].Qtype == dns.TypeA {
addrTranslate |= TranslateAddressAcceptIPv4
addrTranslate |= dnsutil.TranslateAddressAcceptIPv4
} else if req.Question[0].Qtype == dns.TypeAAAA {
addrTranslate |= TranslateAddressAcceptIPv6
addrTranslate |= dnsutil.TranslateAddressAcceptIPv6
} else {
addrTranslate |= TranslateAddressAcceptAny
addrTranslate |= dnsutil.TranslateAddressAcceptAny
}
// The datacenter should be empty during translation if it is a peering lookup.
@ -2055,7 +2056,7 @@ func (d *DNSServer) addServiceSRVRecordsToMessage(cfg *dnsConfig, lookup service
// The datacenter should be empty during translation if it is a peering lookup.
// This should be fine because we should always prefer the WAN address.
serviceAddress := d.agent.TranslateServiceAddress(lookup.Datacenter, node.Service.Address, node.Service.TaggedAddresses, TranslateAddressAcceptAny)
serviceAddress := d.agent.TranslateServiceAddress(lookup.Datacenter, node.Service.Address, node.Service.TaggedAddresses, dnsutil.TranslateAddressAcceptAny)
servicePort := d.agent.TranslateServicePort(lookup.Datacenter, node.Service.Port, node.Service.TaggedAddresses)
tuple := fmt.Sprintf("%s:%s:%d", node.Node.Node, serviceAddress, servicePort)
if _, ok := handled[tuple]; ok {

75
agent/dns/router.go
View File

@ -108,6 +108,8 @@ type Router struct {
logger hclog.Logger
tokenFunc func() string
translateAddressFunc func(dc string, addr string, taggedAddresses map[string]string, accept dnsutil.TranslateAddressAccept) string
translateServiceAddressFunc func(dc string, address string, taggedAddresses map[string]structs.ServiceAddress, accept dnsutil.TranslateAddressAccept) string
// dynamicConfig stores the config as an atomic value (for hot-reloading).
// It is always of type *RouterDynamicConfig
@ -134,6 +136,8 @@ func NewRouter(cfg Config) (*Router, error) {
datacenter: cfg.AgentConfig.Datacenter,
logger: logger,
tokenFunc: cfg.TokenFunc,
translateAddressFunc: cfg.TranslateAddressFunc,
translateServiceAddressFunc: cfg.TranslateServiceAddressFunc,
}
if err := router.ReloadConfig(cfg.AgentConfig); err != nil {
@ -526,9 +530,6 @@ func (r *Router) serializeQueryResults(req *dns.Msg, reqCtx Context,
// The datacenter should be empty during translation if it is a peering lookup.
// This should be fine because we should always prefer the WAN address.
//serviceAddress := d.agent.TranslateServiceAddress(lookup.Datacenter, node.Service.Address, node.Service.TaggedAddresses, TranslateAddressAcceptAny)
//servicePort := d.agent.TranslateServicePort(lookup.Datacenter, node.Service.Port, node.Service.TaggedAddresses)
//tuple := fmt.Sprintf("%s:%s:%d", node.Node.Node, serviceAddress, servicePort)
// TODO (v2-dns): this needs a clean up so we're not assuming this everywhere.
address := ""
@ -554,13 +555,35 @@ func (r *Router) serializeQueryResults(req *dns.Msg, reqCtx Context,
r.appendResultsToDNSResponse(req, reqCtx, query, resp, results, cfg, responseDomain, remoteAddress, maxRecursionLevel)
}
if len(resp.Answer) == 0 && len(resp.Extra) == 0 {
if query != nil && query.QueryType != discovery.QueryTypeVirtual &&
len(resp.Answer) == 0 && len(resp.Extra) == 0 {
return nil, discovery.ErrNoData
}
return resp, nil
}
// getServiceAddressMapFromLocationMap converts a map of Location to a map of ServiceAddress.
func getServiceAddressMapFromLocationMap(taggedAddresses map[string]*discovery.TaggedAddress) map[string]structs.ServiceAddress {
taggedServiceAddresses := make(map[string]structs.ServiceAddress, len(taggedAddresses))
for k, v := range taggedAddresses {
taggedServiceAddresses[k] = structs.ServiceAddress{
Address: v.Address,
Port: int(v.Port.Number),
}
}
return taggedServiceAddresses
}
// getStringAddressMapFromTaggedAddressMap converts a map of Location to a map of string.
func getStringAddressMapFromTaggedAddressMap(taggedAddresses map[string]*discovery.TaggedAddress) map[string]string {
taggedServiceAddresses := make(map[string]string, len(taggedAddresses))
for k, v := range taggedAddresses {
taggedServiceAddresses[k] = v.Address
}
return taggedServiceAddresses
}
// appendResultsToDNSResponse builds dns message from the discovery results and
// appends them to the dns response.
func (r *Router) appendResultsToDNSResponse(req *dns.Msg, reqCtx Context,
@ -906,15 +929,7 @@ func buildAddressResults(req *dns.Msg) ([]*discovery.Result, error) {
func (r *Router) getAnswerExtraAndNs(result *discovery.Result, port discovery.Port, req *dns.Msg, reqCtx Context,
query *discovery.Query, cfg *RouterDynamicConfig, domain string, remoteAddress net.Addr,
maxRecursionLevel int) (answer []dns.RR, extra []dns.RR, ns []dns.RR) {
serviceAddress := newDNSAddress("")
if result.Service != nil {
serviceAddress = newDNSAddress(result.Service.Address)
}
nodeAddress := newDNSAddress("")
if result.Node != nil {
nodeAddress = newDNSAddress(result.Node.Address)
}
serviceAddress, nodeAddress := r.getServiceAndNodeAddresses(result, req)
qName := req.Question[0].Name
ttlLookupName := qName
if query != nil {
@ -983,6 +998,35 @@ func (r *Router) getAnswerExtraAndNs(result *discovery.Result, port discovery.Po
return
}
// getServiceAndNodeAddresses returns the service and node addresses from a discovery result.
func (r *Router) getServiceAndNodeAddresses(result *discovery.Result, req *dns.Msg) (*dnsAddress, *dnsAddress) {
addrTranslate := dnsutil.TranslateAddressAcceptDomain
if req.Question[0].Qtype == dns.TypeA {
addrTranslate |= dnsutil.TranslateAddressAcceptIPv4
} else if req.Question[0].Qtype == dns.TypeAAAA {
addrTranslate |= dnsutil.TranslateAddressAcceptIPv6
} else {
addrTranslate |= dnsutil.TranslateAddressAcceptAny
}
// The datacenter should be empty during translation if it is a peering lookup.
// This should be fine because we should always prefer the WAN address.
serviceAddress := newDNSAddress("")
if result.Service != nil {
sa := r.translateServiceAddressFunc(result.Tenancy.Datacenter,
result.Service.Address, getServiceAddressMapFromLocationMap(result.Service.TaggedAddresses),
addrTranslate)
serviceAddress = newDNSAddress(sa)
}
nodeAddress := newDNSAddress("")
if result.Node != nil {
na := r.translateAddressFunc(result.Tenancy.Datacenter, result.Node.Address,
getStringAddressMapFromTaggedAddressMap(result.Node.TaggedAddresses), addrTranslate)
nodeAddress = newDNSAddress(na)
}
return serviceAddress, nodeAddress
}
// getAnswerExtrasForAddressAndTarget creates the dns answer and extra from nodeAddress and serviceAddress dnsAddress pairs.
func (r *Router) getAnswerExtrasForAddressAndTarget(nodeAddress *dnsAddress, serviceAddress *dnsAddress, req *dns.Msg,
reqCtx Context, result *discovery.Result, port discovery.Port, ttl uint32, remoteAddress net.Addr,
@ -1119,7 +1163,7 @@ func getAnswerExtrasForIP(name string, addr *dnsAddress, question dns.Question,
qType := question.Qtype
canReturnARecord := qType == dns.TypeSRV || qType == dns.TypeA || qType == dns.TypeANY || qType == dns.TypeNS || qType == dns.TypeTXT
canReturnAAAARecord := qType == dns.TypeSRV || qType == dns.TypeAAAA || qType == dns.TypeANY || qType == dns.TypeNS || qType == dns.TypeTXT
if reqType != requestTypeAddress {
if reqType != requestTypeAddress && result.Type != discovery.ResultTypeVirtual {
switch {
// check IPV4
case addr.IsIP() && addr.IsIPV4() && !canReturnARecord,
@ -1143,8 +1187,7 @@ func getAnswerExtrasForIP(name string, addr *dnsAddress, question dns.Question,
}
if reqType != requestTypeAddress && qType == dns.TypeSRV {
if result.Type == discovery.ResultTypeService && addr.IsIP() && result.Service.
Address == addr.String() {
if result.Type == discovery.ResultTypeService && addr.IsIP() && result.Node.Address != addr.String() {
// encode the ip to be used in the header of the A/AAAA record
// as well as the target of the SRV record.
recHdrName = encodeIPAsFqdn(result, addr.IP(), domain)

18
agent/dns/router_query.go
View File

@ -70,6 +70,24 @@ func getQueryNameAndTagFromParts(queryType discovery.QueryType, queryParts []str
return name, tag
}
return queryParts[n-1], ""
case discovery.QueryTypePreparedQuery:
name := ""
// If the first and last DNS query parts begin with _, this is an RFC 2782 style SRV lookup.
// This allows for prepared query names to include "." (for backwards compatibility).
// Otherwise, this is a standard prepared query lookup.
if n >= 2 && strings.HasPrefix(queryParts[0], "_") && strings.HasPrefix(queryParts[n-1], "_") {
// The last DNS query part is the protocol field (ignored).
// All prior parts are the prepared query name or ID.
name = strings.Join(queryParts[:n-1], ".")
// Strip leading underscore
name = name[1:]
} else {
// Allow a "." in the query name, just join all the parts.
name = strings.Join(queryParts, ".")
}
return name, ""
}
return queryParts[n-1], ""
}

169
agent/dns/router_service_question_test.go Normal file
View File

@ -0,0 +1,169 @@
// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1
package dns
import (
"net"
"testing"
"time"
"github.com/hashicorp/consul/agent/discovery"
"github.com/miekg/dns"
"github.com/stretchr/testify/mock"
"github.com/stretchr/testify/require"
)
func Test_HandleRequest_ServiceQuestions(t *testing.T) {
testCases := []HandleTestCase{
// Service Lookup
{
name: "When no data is return from a query, send SOA",
request: &dns.Msg{
MsgHdr: dns.MsgHdr{
Opcode: dns.OpcodeQuery,
},
Question: []dns.Question{
{
Name: "foo.service.consul.",
Qtype: dns.TypeA,
Qclass: dns.ClassINET,
},
},
},
configureDataFetcher: func(fetcher discovery.CatalogDataFetcher) {
fetcher.(*discovery.MockCatalogDataFetcher).
On("FetchEndpoints", mock.Anything, mock.Anything, mock.Anything).
Return(nil, discovery.ErrNoData).
Run(func(args mock.Arguments) {
req := args.Get(1).(*discovery.QueryPayload)
reqType := args.Get(2).(discovery.LookupType)
require.Equal(t, discovery.LookupTypeService, reqType)
require.Equal(t, "foo", req.Name)
})
},
validateAndNormalizeExpected: true,
response: &dns.Msg{
MsgHdr: dns.MsgHdr{
Opcode: dns.OpcodeQuery,
Response: true,
Authoritative: true,
Rcode: dns.RcodeSuccess,
},
Compress: true,
Question: []dns.Question{
{
Name: "foo.service.consul.",
Qtype: dns.TypeA,
Qclass: dns.ClassINET,
},
},
Ns: []dns.RR{
&dns.SOA{
Hdr: dns.RR_Header{
Name: "consul.",
Rrtype: dns.TypeSOA,
Class: dns.ClassINET,
Ttl: 4,
},
Ns: "ns.consul.",
Serial: uint32(time.Now().Unix()),
Mbox: "hostmaster.consul.",
Refresh: 1,
Expire: 3,
Retry: 2,
Minttl: 4,
},
},
},
},
{
// TestDNS_ExternalServiceToConsulCNAMELookup
name: "req type: service / question type: SRV / CNAME required: no",
request: &dns.Msg{
MsgHdr: dns.MsgHdr{
Opcode: dns.OpcodeQuery,
},
Question: []dns.Question{
{
Name: "alias.service.consul.",
Qtype: dns.TypeSRV,
},
},
},
configureDataFetcher: func(fetcher discovery.CatalogDataFetcher) {
fetcher.(*discovery.MockCatalogDataFetcher).
On("FetchEndpoints", mock.Anything,
&discovery.QueryPayload{
Name: "alias",
Tenancy: discovery.QueryTenancy{},
}, discovery.LookupTypeService).
Return([]*discovery.Result{
{
Type: discovery.ResultTypeVirtual,
Service: &discovery.Location{Name: "alias", Address: "web.service.consul"},
Node: &discovery.Location{Name: "web", Address: "web.service.consul"},
},
},
nil).On("FetchEndpoints", mock.Anything,
&discovery.QueryPayload{
Name: "web",
Tenancy: discovery.QueryTenancy{},
}, discovery.LookupTypeService).
Return([]*discovery.Result{
{
Type: discovery.ResultTypeNode,
Service: &discovery.Location{Name: "web", Address: "webnode"},
Node: &discovery.Location{Name: "webnode", Address: "127.0.0.2"},
},
}, nil).On("ValidateRequest", mock.Anything,
mock.Anything).Return(nil).On("NormalizeRequest", mock.Anything)
},
response: &dns.Msg{
MsgHdr: dns.MsgHdr{
Response: true,
Authoritative: true,
},
Compress: true,
Question: []dns.Question{
{
Name: "alias.service.consul.",
Qtype: dns.TypeSRV,
},
},
Answer: []dns.RR{
&dns.SRV{
Hdr: dns.RR_Header{
Name: "alias.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
Ttl: 123,
},
Target: "web.service.consul.",
Priority: 1,
},
},
Extra: []dns.RR{
&dns.A{
Hdr: dns.RR_Header{
Name: "web.service.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
Ttl: 123,
},
A: net.ParseIP("127.0.0.2"),
},
},
},
},
}
testCases = append(testCases, getAdditionalTestCases(t)...)
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
runHandleTestCases(t, tc)
})
}
}

195
agent/dns/router_test.go
View File

@ -6,6 +6,7 @@ package dns
import (
"errors"
"fmt"
"github.com/hashicorp/consul/internal/dnsutil"
"net"
"reflect"
"testing"
@ -37,8 +38,7 @@ type HandleTestCase struct {
response *dns.Msg
}
func Test_HandleRequest(t *testing.T) {
soa := &dns.SOA{
var testSOA = &dns.SOA{
Hdr: dns.RR_Header{
Name: "consul.",
Rrtype: dns.TypeSOA,
@ -52,8 +52,9 @@ func Test_HandleRequest(t *testing.T) {
Retry: 2,
Expire: 3,
Minttl: 4,
}
}
func Test_HandleRequest(t *testing.T) {
testCases := []HandleTestCase{
// recursor queries
{
@ -800,7 +801,17 @@ func Test_HandleRequest(t *testing.T) {
Qclass: dns.ClassINET,
},
},
Ns: []dns.RR{soa},
Extra: []dns.RR{
&dns.AAAA{
Hdr: dns.RR_Header{
Name: "20010db800010002cafe000000001337.virtual.dc1.consul.",
Rrtype: dns.TypeAAAA,
Class: dns.ClassINET,
Ttl: 123,
},
AAAA: net.ParseIP("2001:db8:1:2:cafe::1337"),
},
},
},
},
// SOA Queries
@ -1456,158 +1467,7 @@ func Test_HandleRequest(t *testing.T) {
},
},
},
// Service Lookup
{
name: "When no data is return from a query, send SOA",
request: &dns.Msg{
MsgHdr: dns.MsgHdr{
Opcode: dns.OpcodeQuery,
},
Question: []dns.Question{
{
Name: "foo.service.consul.",
Qtype: dns.TypeA,
Qclass: dns.ClassINET,
},
},
},
configureDataFetcher: func(fetcher discovery.CatalogDataFetcher) {
fetcher.(*discovery.MockCatalogDataFetcher).
On("FetchEndpoints", mock.Anything, mock.Anything, mock.Anything).
Return(nil, discovery.ErrNoData).
Run(func(args mock.Arguments) {
req := args.Get(1).(*discovery.QueryPayload)
reqType := args.Get(2).(discovery.LookupType)
require.Equal(t, discovery.LookupTypeService, reqType)
require.Equal(t, "foo", req.Name)
})
},
validateAndNormalizeExpected: true,
response: &dns.Msg{
MsgHdr: dns.MsgHdr{
Opcode: dns.OpcodeQuery,
Response: true,
Authoritative: true,
Rcode: dns.RcodeSuccess,
},
Compress: true,
Question: []dns.Question{
{
Name: "foo.service.consul.",
Qtype: dns.TypeA,
Qclass: dns.ClassINET,
},
},
Ns: []dns.RR{
&dns.SOA{
Hdr: dns.RR_Header{
Name: "consul.",
Rrtype: dns.TypeSOA,
Class: dns.ClassINET,
Ttl: 4,
},
Ns: "ns.consul.",
Serial: uint32(time.Now().Unix()),
Mbox: "hostmaster.consul.",
Refresh: 1,
Expire: 3,
Retry: 2,
Minttl: 4,
},
},
},
},
{
// TestDNS_ExternalServiceToConsulCNAMELookup
name: "req type: service / question type: SRV / CNAME required: no",
request: &dns.Msg{
MsgHdr: dns.MsgHdr{
Opcode: dns.OpcodeQuery,
},
Question: []dns.Question{
{
Name: "alias.service.consul.",
Qtype: dns.TypeSRV,
},
},
},
configureDataFetcher: func(fetcher discovery.CatalogDataFetcher) {
fetcher.(*discovery.MockCatalogDataFetcher).
On("FetchEndpoints", mock.Anything,
&discovery.QueryPayload{
Name: "alias",
Tenancy: discovery.QueryTenancy{},
}, discovery.LookupTypeService).
Return([]*discovery.Result{
{
Type: discovery.ResultTypeVirtual,
Service: &discovery.Location{Name: "alias", Address: "web.service.consul"},
Node: &discovery.Location{Name: "web", Address: "web.service.consul"},
Ports: []discovery.Port{
{
Number: 1234,
},
},
},
},
nil).On("FetchEndpoints", mock.Anything,
&discovery.QueryPayload{
Name: "web",
Tenancy: discovery.QueryTenancy{},
}, discovery.LookupTypeService).
Return([]*discovery.Result{
{
Type: discovery.ResultTypeNode,
Service: &discovery.Location{Name: "web", Address: "webnode"},
Node: &discovery.Location{Name: "webnode", Address: "127.0.0.2"},
Ports: []discovery.Port{
{
Number: 1234,
},
},
},
}, nil).On("ValidateRequest", mock.Anything,
mock.Anything).Return(nil).On("NormalizeRequest", mock.Anything)
},
response: &dns.Msg{
MsgHdr: dns.MsgHdr{
Response: true,
Authoritative: true,
},
Compress: true,
Question: []dns.Question{
{
Name: "alias.service.consul.",
Qtype: dns.TypeSRV,
},
},
Answer: []dns.RR{
&dns.SRV{
Hdr: dns.RR_Header{
Name: "alias.service.consul.",
Rrtype: dns.TypeSRV,
Class: dns.ClassINET,
Ttl: 123,
},
Target: "web.service.consul.",
Priority: 1,
Port: 1234,
},
},
Extra: []dns.RR{
&dns.A{
Hdr: dns.RR_Header{
Name: "web.service.consul.",
Rrtype: dns.TypeA,
Class: dns.ClassINET,
Ttl: 123,
},
A: net.ParseIP("127.0.0.2"),
},
},
},
},
// TODO (v2-dns): add a test to make sure only 3 records are returned
// V2 Workload Lookup
{
name: "workload A query w/ port, returns A record",
@ -2851,7 +2711,14 @@ func Test_HandleRequest(t *testing.T) {
testCases = append(testCases, getAdditionalTestCases(t)...)
run := func(t *testing.T, tc HandleTestCase) {
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
runHandleTestCases(t, tc)
})
}
}
func runHandleTestCases(t *testing.T, tc HandleTestCase) {
cdf := discovery.NewMockCatalogDataFetcher(t)
if tc.validateAndNormalizeExpected {
cdf.On("ValidateRequest", mock.Anything, mock.Anything).Return(nil)
@ -2878,14 +2745,6 @@ func Test_HandleRequest(t *testing.T) {
}
actual := router.HandleRequest(tc.request, *ctx, tc.remoteAddress)
require.Equal(t, tc.response, actual)
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
run(t, tc)
})
}
}
func TestRouterDynamicConfig_GetTTLForService(t *testing.T) {
@ -2957,6 +2816,12 @@ func buildDNSConfig(agentConfig *config.RuntimeConfig, cdf discovery.CatalogData
Logger: hclog.NewNullLogger(),
Processor: discovery.NewQueryProcessor(cdf),
TokenFunc: func() string { return "" },
TranslateServiceAddressFunc: func(dc string, address string, taggedAddresses map[string]structs.ServiceAddress, accept dnsutil.TranslateAddressAccept) string {
return address
},
TranslateAddressFunc: func(dc string, addr string, taggedAddresses map[string]string, accept dnsutil.TranslateAddressAccept) string {
return addr
},
}
if agentConfig != nil {

4
agent/dns/server.go
View File

@ -5,6 +5,8 @@ package dns
import (
"fmt"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/internal/dnsutil"
"net"
"github.com/miekg/dns"
@ -41,6 +43,8 @@ type Config struct {
Logger hclog.Logger
Processor DiscoveryQueryProcessor
TokenFunc func() string
TranslateAddressFunc func(dc string, addr string, taggedAddresses map[string]string, accept dnsutil.TranslateAddressAccept) string
TranslateServiceAddressFunc func(dc string, address string, taggedAddresses map[string]structs.ServiceAddress, accept dnsutil.TranslateAddressAccept) string
}
// NewServer creates a new DNS server.

4
agent/dns_node_lookup_test.go
View File

@ -14,14 +14,12 @@ import (
"github.com/hashicorp/consul/testrpc"
)
// TODO (v2-dns): Failing on "lookup a non-existing node, we should receive a SOA"
// it is coming back empty.
func TestDNS_NodeLookup(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(false) {
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()

10
agent/dns_service_lookup_test.go
View File

@ -1338,7 +1338,6 @@ func TestDNS_AltDomain_ServiceLookup_ServiceAddress_A(t *testing.T) {
}
}
// TODO (v2-dns): NET-7632 - Fix node and prepared query lookups when question name has a period in it
func TestDNS_ServiceLookup_ServiceAddress_SRV(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
@ -1352,7 +1351,7 @@ func TestDNS_ServiceLookup_ServiceAddress_SRV(t *testing.T) {
})
defer recursor.Shutdown()
for name, experimentsHCL := range getVersionHCL(false) {
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, `
recursors = ["`+recursor.Addr+`"]
@ -1666,13 +1665,12 @@ func TestDNS_AltDomain_ServiceLookup_ServiceAddressIPV6(t *testing.T) {
}
}
// TODO (v2-dns): NET-7634 - Implement WAN translation
func TestDNS_ServiceLookup_WanTranslation(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(false) {
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a1 := NewTestAgent(t, `
datacenter = "dc1"
@ -2063,13 +2061,12 @@ func TestDNS_ServiceLookup_TagPeriod(t *testing.T) {
}
}
// TODO (v2-dns): NET-7632 - Fix node and prepared query lookups when question name has a period in it.
func TestDNS_ServiceLookup_PreparedQueryNamePeriod(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(false) {
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
@ -3297,7 +3294,6 @@ func checkDNSService(
}
}
// TODO (v2-dns): NET-7633 - implement answer limits.
func TestDNS_ServiceLookup_ARecordLimits(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")

11
agent/dns_test.go
View File

@ -1008,13 +1008,12 @@ func TestDNS_AltDomain_NSRecords_IPV6(t *testing.T) {
}
}
// TODO NET-7644 - Implement service and prepared query lookup for tagged addresses
func TestDNS_Lookup_TaggedIPAddresses(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
for name, experimentsHCL := range getVersionHCL(false) {
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
@ -1222,7 +1221,7 @@ func TestDNS_PreparedQueryNearIPEDNS(t *testing.T) {
{"foo3", "198.18.0.3", lib.GenerateCoordinate(30 * time.Millisecond)},
}
for name, experimentsHCL := range getVersionHCL(false) {
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
@ -1356,7 +1355,7 @@ func TestDNS_PreparedQueryNearIP(t *testing.T) {
{"foo3", "198.18.0.3", lib.GenerateCoordinate(30 * time.Millisecond)},
}
for name, experimentsHCL := range getVersionHCL(false) {
for name, experimentsHCL := range getVersionHCL(true) {
t.Run(name, func(t *testing.T) {
a := NewTestAgent(t, experimentsHCL)
defer a.Shutdown()
@ -2149,6 +2148,7 @@ func TestDNS_NonExistentLookupEmptyAorAAAA(t *testing.T) {
"webv4.query.consul.",
}
for _, question := range questions {
t.Run(question, func(t *testing.T) {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeAAAA)
@ -2168,6 +2168,7 @@ func TestDNS_NonExistentLookupEmptyAorAAAA(t *testing.T) {
}
require.Equal(t, dns.RcodeSuccess, in.Rcode)
})
}
// Check for ipv4 records on ipv6-only service directly and via the
@ -2177,6 +2178,7 @@ func TestDNS_NonExistentLookupEmptyAorAAAA(t *testing.T) {
"webv6.query.consul.",
}
for _, question := range questions {
t.Run(question, func(t *testing.T) {
m := new(dns.Msg)
m.SetQuestion(question, dns.TypeA)
@ -2201,6 +2203,7 @@ func TestDNS_NonExistentLookupEmptyAorAAAA(t *testing.T) {
if in.Rcode != dns.RcodeSuccess {
t.Fatalf("Bad: %#v", in)
}
})
}
})
}

3
agent/health_endpoint.go
View File

@ -11,6 +11,7 @@ import (
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/internal/dnsutil"
)
const (
@ -243,7 +244,7 @@ func (s *HTTPHandlers) healthServiceNodes(resp http.ResponseWriter, req *http.Re
}
// Translate addresses after filtering so we don't waste effort.
s.agent.TranslateAddresses(args.Datacenter, out.Nodes, TranslateAddressAcceptAny)
s.agent.TranslateAddresses(args.Datacenter, out.Nodes, dnsutil.TranslateAddressAcceptAny)
// Use empty list instead of nil
if out.Nodes == nil {

3
agent/prepared_query_endpoint.go
View File

@ -11,6 +11,7 @@ import (
cachetype "github.com/hashicorp/consul/agent/cache-types"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/internal/dnsutil"
)
// preparedQueryCreateResponse is used to wrap the query ID.
@ -162,7 +163,7 @@ func (s *HTTPHandlers) preparedQueryExecute(id string, resp http.ResponseWriter,
// a query can fail over to a different DC than where the execute request
// was sent to. That's why we use the reply's DC and not the one from
// the args.
s.agent.TranslateAddresses(reply.Datacenter, reply.Nodes, TranslateAddressAcceptAny)
s.agent.TranslateAddresses(reply.Datacenter, reply.Nodes, dnsutil.TranslateAddressAcceptAny)
// Use empty list instead of nil.
if reply.Nodes == nil {

31
agent/translate_addr.go
View File

@ -5,21 +5,12 @@ package agent
import (
"fmt"
"github.com/hashicorp/consul/internal/dnsutil"
"net"
"github.com/hashicorp/consul/agent/structs"
)
type TranslateAddressAccept int
const (
TranslateAddressAcceptDomain TranslateAddressAccept = 1 << iota
TranslateAddressAcceptIPv4
TranslateAddressAcceptIPv6
TranslateAddressAcceptAny TranslateAddressAccept = ^0
)
// TranslateServicePort is used to provide the final, translated port for a service,
// depending on how the agent and the other node are configured. The dc
// parameter is the dc the datacenter this node is from.
@ -35,7 +26,7 @@ func (a *Agent) TranslateServicePort(dc string, port int, taggedAddresses map[st
// TranslateServiceAddress is used to provide the final, translated address for a node,
// depending on how the agent and the other node are configured. The dc
// parameter is the dc the datacenter this node is from.
func (a *Agent) TranslateServiceAddress(dc string, addr string, taggedAddresses map[string]structs.ServiceAddress, accept TranslateAddressAccept) string {
func (a *Agent) TranslateServiceAddress(dc string, addr string, taggedAddresses map[string]structs.ServiceAddress, accept dnsutil.TranslateAddressAccept) string {
def := addr
v4 := taggedAddresses[structs.TaggedAddressLANIPv4].Address
v6 := taggedAddresses[structs.TaggedAddressLANIPv6].Address
@ -59,7 +50,7 @@ func (a *Agent) TranslateServiceAddress(dc string, addr string, taggedAddresses
// TranslateAddress is used to provide the final, translated address for a node,
// depending on how the agent and the other node are configured. The dc
// parameter is the dc the datacenter this node is from.
func (a *Agent) TranslateAddress(dc string, addr string, taggedAddresses map[string]string, accept TranslateAddressAccept) string {
func (a *Agent) TranslateAddress(dc string, addr string, taggedAddresses map[string]string, accept dnsutil.TranslateAddressAccept) string {
def := addr
v4 := taggedAddresses[structs.TaggedAddressLANIPv4]
v6 := taggedAddresses[structs.TaggedAddressLANIPv6]
@ -80,22 +71,22 @@ func (a *Agent) TranslateAddress(dc string, addr string, taggedAddresses map[str
return translateAddressAccept(accept, def, v4, v6)
}
func translateAddressAccept(accept TranslateAddressAccept, def, v4, v6 string) string {
func translateAddressAccept(accept dnsutil.TranslateAddressAccept, def, v4, v6 string) string {
switch {
case accept&TranslateAddressAcceptIPv6 > 0 && v6 != "":
case accept&dnsutil.TranslateAddressAcceptIPv6 > 0 && v6 != "":
return v6
case accept&TranslateAddressAcceptIPv4 > 0 && v4 != "":
case accept&dnsutil.TranslateAddressAcceptIPv4 > 0 && v4 != "":
return v4
case accept&TranslateAddressAcceptAny > 0 && def != "":
case accept&dnsutil.TranslateAddressAcceptAny > 0 && def != "":
return def
default:
defIP := net.ParseIP(def)
switch {
case defIP != nil && defIP.To4() != nil && accept&TranslateAddressAcceptIPv4 > 0:
case defIP != nil && defIP.To4() != nil && accept&dnsutil.TranslateAddressAcceptIPv4 > 0:
return def
case defIP != nil && defIP.To4() == nil && accept&TranslateAddressAcceptIPv6 > 0:
case defIP != nil && defIP.To4() == nil && accept&dnsutil.TranslateAddressAcceptIPv6 > 0:
return def
case defIP == nil && accept&TranslateAddressAcceptDomain > 0:
case defIP == nil && accept&dnsutil.TranslateAddressAcceptDomain > 0:
return def
}
}
@ -106,7 +97,7 @@ func translateAddressAccept(accept TranslateAddressAccept, def, v4, v6 string) s
// TranslateAddresses translates addresses in the given structure into the
// final, translated address, depending on how the agent and the other node are
// configured. The dc parameter is the datacenter this structure is from.
func (a *Agent) TranslateAddresses(dc string, subj interface{}, accept TranslateAddressAccept) {
func (a *Agent) TranslateAddresses(dc string, subj interface{}, accept dnsutil.TranslateAddressAccept) {
// CAUTION - SUBTLE! An agent running on a server can, in some cases,
// return pointers directly into the immutable state store for
// performance (it's via the in-memory RPC mechanism). It's never safe

8
internal/dnsutil/dns.go
View File

@ -13,6 +13,8 @@ import (
"github.com/miekg/dns"
)
type TranslateAddressAccept int
// MaxLabelLength is the maximum length for a name that can be used in DNS.
const (
MaxLabelLength = 63
@ -20,6 +22,12 @@ const (
arpaLabel = "arpa"
arpaIPV4Label = "in-addr"
arpaIPV6Label = "ip6"
TranslateAddressAcceptDomain TranslateAddressAccept = 1 << iota
TranslateAddressAcceptIPv4
TranslateAddressAcceptIPv6
TranslateAddressAcceptAny TranslateAddressAccept = ^0
)
// InvalidNameRe is a regex that matches characters which can not be included in