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Merge pull request #4083 from 42wim/serviceptr 

DNS: Add support for reverse lookup of services
This commit is contained in:
Matt Keeler 2018-05-22 10:13:11 -04:00 committed by GitHub
parent ad27d72d6a 16ce8d9ed2
commit 70d7a24cb9
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
14 changed files with 687 additions and 1 deletions
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5
agent/consul/catalog_endpoint.go
View File

@ -240,7 +240,7 @@ func (c *Catalog) ServiceNodes(args *structs.ServiceSpecificRequest, reply *stru
}
// Verify the arguments
if args.ServiceName == "" {
if args.ServiceName == "" && args.ServiceAddress == "" {
return fmt.Errorf("Must provide service name")
}
@ -256,6 +256,9 @@ func (c *Catalog) ServiceNodes(args *structs.ServiceSpecificRequest, reply *stru
} else {
index, services, err = state.ServiceNodes(ws, args.ServiceName)
}
if args.ServiceAddress != "" {
index, services, err = state.ServiceAddressNodes(ws, args.ServiceAddress)
}
if err != nil {
return err
}

30
agent/consul/state/catalog.go
View File

@ -855,6 +855,36 @@ func serviceTagFilter(sn *structs.ServiceNode, tag string) bool {
return true
}
// ServiceAddressNodes returns the nodes associated with a given service, filtering
// out services that don't match the given serviceAddress
func (s *Store) ServiceAddressNodes(ws memdb.WatchSet, address string) (uint64, structs.ServiceNodes, error) {
tx := s.db.Txn(false)
defer tx.Abort()
// List all the services.
services, err := tx.Get("services", "id")
if err != nil {
return 0, nil, fmt.Errorf("failed service lookup: %s", err)
}
ws.Add(services.WatchCh())
// Gather all the services and apply the tag filter.
var results structs.ServiceNodes
for service := services.Next(); service != nil; service = services.Next() {
svc := service.(*structs.ServiceNode)
if svc.ServiceAddress == address {
results = append(results, svc)
}
}
// Fill in the node details.
results, err = s.parseServiceNodes(tx, ws, results)
if err != nil {
return 0, nil, fmt.Errorf("failed parsing service nodes: %s", err)
}
return 0, results, nil
}
// parseServiceNodes iterates over a services query and fills in the node details,
// returning a ServiceNodes slice.
func (s *Store) parseServiceNodes(tx *memdb.Txn, ws memdb.WatchSet, services structs.ServiceNodes) (structs.ServiceNodes, error) {

29
agent/dns.go
View File

@ -12,6 +12,7 @@ import (
"regexp"
"github.com/armon/go-metrics"
"github.com/coredns/coredns/plugin/pkg/dnsutil"
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/agent/consul"
"github.com/hashicorp/consul/agent/structs"
@ -207,6 +208,34 @@ func (d *DNSServer) handlePtr(resp dns.ResponseWriter, req *dns.Msg) {
}
}
// only look into the services if we didn't find a node
if len(m.Answer) == 0 {
// lookup the service address
serviceAddress := dnsutil.ExtractAddressFromReverse(qName)
sargs := structs.ServiceSpecificRequest{
Datacenter: datacenter,
QueryOptions: structs.QueryOptions{
Token: d.agent.tokens.UserToken(),
AllowStale: d.config.AllowStale,
},
ServiceAddress: serviceAddress,
}
var sout structs.IndexedServiceNodes
if err := d.agent.RPC("Catalog.ServiceNodes", &sargs, &sout); err == nil {
for _, n := range sout.ServiceNodes {
if n.ServiceAddress == serviceAddress {
ptr := &dns.PTR{
Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypePTR, Class: dns.ClassINET, Ttl: 0},
Ptr: fmt.Sprintf("%s.service.%s", n.ServiceName, d.domain),
}
m.Answer = append(m.Answer, ptr)
break
}
}
}
}
// nothing found locally, recurse
if len(m.Answer) == 0 {
d.handleRecurse(resp, req)

190
agent/dns_test.go
View File

@ -671,6 +671,196 @@ func TestDNS_ReverseLookup_IPV6(t *testing.T) {
}
}
func TestDNS_ServiceReverseLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "127.0.0.2",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("2.0.0.127.in-addr.arpa.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "db.service.consul." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceReverseLookup_IPV6(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "2001:db8::1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "2001:db8::ff00:42:8329",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("9.2.3.8.2.4.0.0.0.0.f.f.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "db.service.consul." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceReverseLookup_CustomDomain(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), `
domain = "custom"
`)
defer a.Shutdown()
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "127.0.0.2",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("2.0.0.127.in-addr.arpa.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "db.service.custom." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceReverseLookupNodeAddress(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
// Register a node with a service.
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "foo",
Address: "127.0.0.1",
Service: &structs.NodeService{
Service: "db",
Tags: []string{"master"},
Port: 12345,
Address: "127.0.0.1",
},
}
var out struct{}
if err := a.RPC("Catalog.Register", args, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
m := new(dns.Msg)
m.SetQuestion("1.0.0.127.in-addr.arpa.", dns.TypeANY)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
t.Fatalf("err: %v", err)
}
if len(in.Answer) != 1 {
t.Fatalf("Bad: %#v", in)
}
ptrRec, ok := in.Answer[0].(*dns.PTR)
if !ok {
t.Fatalf("Bad: %#v", in.Answer[0])
}
if ptrRec.Ptr != "foo.node.dc1.consul." {
t.Fatalf("Bad: %#v", ptrRec)
}
}
func TestDNS_ServiceLookup(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), "")

1
agent/structs/structs.go
View File

@ -279,6 +279,7 @@ type ServiceSpecificRequest struct {
NodeMetaFilters map[string]string
ServiceName string
ServiceTag string
ServiceAddress string
TagFilter bool // Controls tag filtering
Source QuerySource
QueryOptions

201
vendor/github.com/coredns/coredns/LICENSE generated vendored Normal file
View File

@ -0,0 +1,201 @@
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15
vendor/github.com/coredns/coredns/plugin/pkg/dnsutil/cname.go generated vendored Normal file
View File

@ -0,0 +1,15 @@
package dnsutil
import "github.com/miekg/dns"
// DuplicateCNAME returns true if r already exists in records.
func DuplicateCNAME(r *dns.CNAME, records []dns.RR) bool {
for _, rec := range records {
if v, ok := rec.(*dns.CNAME); ok {
if v.Target == r.Target {
return true
}
}
}
return false
}

12
vendor/github.com/coredns/coredns/plugin/pkg/dnsutil/dedup.go generated vendored Normal file
View File

@ -0,0 +1,12 @@
package dnsutil
import "github.com/miekg/dns"
// Dedup de-duplicates a message.
func Dedup(m *dns.Msg) *dns.Msg {
// TODO(miek): expensive!
m.Answer = dns.Dedup(m.Answer, nil)
m.Ns = dns.Dedup(m.Ns, nil)
m.Extra = dns.Dedup(m.Extra, nil)
return m
}

2
vendor/github.com/coredns/coredns/plugin/pkg/dnsutil/doc.go generated vendored Normal file
View File

@ -0,0 +1,2 @@
// Package dnsutil contains DNS related helper functions.
package dnsutil

82
vendor/github.com/coredns/coredns/plugin/pkg/dnsutil/host.go generated vendored Normal file
View File

@ -0,0 +1,82 @@
package dnsutil
import (
"fmt"
"net"
"os"
"github.com/miekg/dns"
)
// ParseHostPortOrFile parses the strings in s, each string can either be a address,
// address:port or a filename. The address part is checked and the filename case a
// resolv.conf like file is parsed and the nameserver found are returned.
func ParseHostPortOrFile(s ...string) ([]string, error) {
var servers []string
for _, host := range s {
addr, _, err := net.SplitHostPort(host)
if err != nil {
// Parse didn't work, it is not a addr:port combo
if net.ParseIP(host) == nil {
// Not an IP address.
ss, err := tryFile(host)
if err == nil {
servers = append(servers, ss...)
continue
}
return servers, fmt.Errorf("not an IP address or file: %q", host)
}
ss := net.JoinHostPort(host, "53")
servers = append(servers, ss)
continue
}
if net.ParseIP(addr) == nil {
// No an IP address.
ss, err := tryFile(host)
if err == nil {
servers = append(servers, ss...)
continue
}
return servers, fmt.Errorf("not an IP address or file: %q", host)
}
servers = append(servers, host)
}
return servers, nil
}
// Try to open this is a file first.
func tryFile(s string) ([]string, error) {
c, err := dns.ClientConfigFromFile(s)
if err == os.ErrNotExist {
return nil, fmt.Errorf("failed to open file %q: %q", s, err)
} else if err != nil {
return nil, err
}
servers := []string{}
for _, s := range c.Servers {
servers = append(servers, net.JoinHostPort(s, c.Port))
}
return servers, nil
}
// ParseHostPort will check if the host part is a valid IP address, if the
// IP address is valid, but no port is found, defaultPort is added.
func ParseHostPort(s, defaultPort string) (string, error) {
addr, port, err := net.SplitHostPort(s)
if port == "" {
port = defaultPort
}
if err != nil {
if net.ParseIP(s) == nil {
return "", fmt.Errorf("must specify an IP address: `%s'", s)
}
return net.JoinHostPort(s, port), nil
}
if net.ParseIP(addr) == nil {
return "", fmt.Errorf("must specify an IP address: `%s'", addr)
}
return net.JoinHostPort(addr, port), nil
}

19
vendor/github.com/coredns/coredns/plugin/pkg/dnsutil/join.go generated vendored Normal file
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@ -0,0 +1,19 @@
package dnsutil
import (
"strings"
"github.com/miekg/dns"
)
// Join joins labels to form a fully qualified domain name. If the last label is
// the root label it is ignored. Not other syntax checks are performed.
func Join(labels []string) string {
ll := len(labels)
if labels[ll-1] == "." {
s := strings.Join(labels[:ll-1], ".")
return dns.Fqdn(s)
}
s := strings.Join(labels, ".")
return dns.Fqdn(s)
}

81
vendor/github.com/coredns/coredns/plugin/pkg/dnsutil/reverse.go generated vendored Normal file
View File

@ -0,0 +1,81 @@
package dnsutil
import (
"net"
"strings"
)
// ExtractAddressFromReverse turns a standard PTR reverse record name
// into an IP address. This works for ipv4 or ipv6.
//
// 54.119.58.176.in-addr.arpa. becomes 176.58.119.54. If the conversion
// fails the empty string is returned.
func ExtractAddressFromReverse(reverseName string) string {
search := ""
f := reverse
switch {
case strings.HasSuffix(reverseName, IP4arpa):
search = strings.TrimSuffix(reverseName, IP4arpa)
case strings.HasSuffix(reverseName, IP6arpa):
search = strings.TrimSuffix(reverseName, IP6arpa)
f = reverse6
default:
return ""
}
// Reverse the segments and then combine them.
return f(strings.Split(search, "."))
}
// IsReverse returns 0 is name is not in a reverse zone. Anything > 0 indicates
// name is in a reverse zone. The returned integer will be 1 for in-addr.arpa. (IPv4)
// and 2 for ip6.arpa. (IPv6).
func IsReverse(name string) int {
if strings.HasSuffix(name, IP4arpa) {
return 1
}
if strings.HasSuffix(name, IP6arpa) {
return 2
}
return 0
}
func reverse(slice []string) string {
for i := 0; i < len(slice)/2; i++ {
j := len(slice) - i - 1
slice[i], slice[j] = slice[j], slice[i]
}
ip := net.ParseIP(strings.Join(slice, ".")).To4()
if ip == nil {
return ""
}
return ip.String()
}
// reverse6 reverse the segments and combine them according to RFC3596:
// b.a.9.8.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2
// is reversed to 2001:db8::567:89ab
func reverse6(slice []string) string {
for i := 0; i < len(slice)/2; i++ {
j := len(slice) - i - 1
slice[i], slice[j] = slice[j], slice[i]
}
slice6 := []string{}
for i := 0; i < len(slice)/4; i++ {
slice6 = append(slice6, strings.Join(slice[i*4:i*4+4], ""))
}
ip := net.ParseIP(strings.Join(slice6, ":")).To16()
if ip == nil {
return ""
}
return ip.String()
}
const (
// IP4arpa is the reverse tree suffix for v4 IP addresses.
IP4arpa = ".in-addr.arpa."
// IP6arpa is the reverse tree suffix for v6 IP addresses.
IP6arpa = ".ip6.arpa."
)

20
vendor/github.com/coredns/coredns/plugin/pkg/dnsutil/zone.go generated vendored Normal file
View File

@ -0,0 +1,20 @@
package dnsutil
import (
"errors"
"github.com/miekg/dns"
)
// TrimZone removes the zone component from q. It returns the trimmed
// name or an error is zone is longer then qname. The trimmed name will be returned
// without a trailing dot.
func TrimZone(q string, z string) (string, error) {
zl := dns.CountLabel(z)
i, ok := dns.PrevLabel(q, zl)
if ok || i-1 < 0 {
return "", errors.New("trimzone: overshot qname: " + q + "for zone " + z)
}
// This includes the '.', remove on return
return q[:i-1], nil
}

1
vendor/vendor.json vendored
View File

@ -20,6 +20,7 @@
{"path":"github.com/circonus-labs/circonus-gometrics/api","checksumSHA1":"WUE6oF152uN5FcLmmq+nO3Yl7pU=","revision":"d17a8420c36e800fcb46bbd4d2a15b93c68605ea","revisionTime":"2016-11-09T19:23:37Z"},
{"path":"github.com/circonus-labs/circonus-gometrics/checkmgr","checksumSHA1":"beRBHHy2+V6Ht4cACIMmZOCnzgg=","revision":"d17a8420c36e800fcb46bbd4d2a15b93c68605ea","revisionTime":"2016-11-09T19:23:37Z"},
{"path":"github.com/circonus-labs/circonusllhist","checksumSHA1":"C4Z7+l5GOpOCW5DcvNYzheGvQRE=","revision":"365d370cc1459bdcaceda3499453668373dea1d0","revisionTime":"2016-11-10T00:26:50Z"},
{"path":"github.com/coredns/coredns/plugin/pkg/dnsutil","checksumSHA1":"EoOyMf0m3NkVWRxJ4jGUSkVCM8c=","revision":"582f91f3f3aa0b956c152b72ad9c95b8f597a2b0","revisionTime":"2018-04-23T12:44:33Z","version":"v1.1.2","versionExact":"v1.1.2"},
{"path":"github.com/davecgh/go-spew/spew","checksumSHA1":"dvabztWVQX8f6oMLRyv4dLH+TGY=","revision":"346938d642f2ec3594ed81d874461961cd0faa76","revisionTime":"2016-10-29T20:57:26Z"},
{"path":"github.com/docker/go-connections/sockets","checksumSHA1":"jUfDG3VQsA2UZHvvIXncgiddpYA=","revision":"3ede32e2033de7505e6500d6c868c2b9ed9f169d","revisionTime":"2017-06-23T20:36:43Z"},
{"path":"github.com/elazarl/go-bindata-assetfs","checksumSHA1":"5ftkjfUwI9A6xCQ1PwIAd5+qlo0=","revision":"e1a2a7ec64b07d04ac9ebb072404fe8b7b60de1b","revisionTime":"2016-08-03T19:23:04Z"},