forked from partkyle/docker-dns
/
main_test.go
276 lines (219 loc) · 7.24 KB
/
main_test.go
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package main
import (
"fmt"
"net"
"strings"
"github.com/fsouza/go-dockerclient"
"github.com/miekg/dns"
"testing"
)
type FakeDockerClient struct {
inspectContainer func(string) (*docker.Container, error)
listContainers func(docker.ListContainersOptions) ([]docker.APIContainers, error)
}
func (f *FakeDockerClient) InspectContainer(s string) (*docker.Container, error) {
return f.inspectContainer(s)
}
func (f *FakeDockerClient) ListContainers(o docker.ListContainersOptions) ([]docker.APIContainers, error) {
return f.listContainers(o)
}
func setup(t *testing.T, domain string) (net.Listener, *FakeDockerClient, *dns.Server, *dns.Client) {
listener, err := net.Listen("tcp", ":0")
if err != nil {
t.Fatal(err)
}
dockerClient := &FakeDockerClient{}
handler := &Handler{domain: domain, docker: dockerClient}
server := &dns.Server{Listener: listener, Handler: handler}
go func() {
err := server.ActivateAndServe()
if err != nil {
t.Fatal()
}
}()
client := &dns.Client{}
client.Net = "tcp"
return listener, dockerClient, server, client
}
func TestDockerClientError(t *testing.T) {
listener, dockerClient, _, client := setup(t, ".")
dockerClient.inspectContainer = func(string) (*docker.Container, error) { return nil, fmt.Errorf("error") }
msg := &dns.Msg{}
msg.Id = dns.Id()
msg.RecursionDesired = true
msg.Question = []dns.Question{
{Name: "api.docker.", Qclass: dns.ClassINET, Qtype: dns.TypeA},
}
_, _, err := client.Exchange(msg, listener.Addr().String())
if err != nil {
t.Fatal(err)
}
listener.Close()
}
func TestDockerClient_ARecords(t *testing.T) {
container := "api"
domain := ".docker."
ip := "127.0.0.1"
listener, dockerClient, _, client := setup(t, domain)
dockerClient.inspectContainer = func(c string) (*docker.Container, error) {
if c != container {
return nil, fmt.Errorf("container does not exist; have %s, want %s:", c, container)
}
return &docker.Container{NetworkSettings: &docker.NetworkSettings{IPAddress: ip}}, nil
}
msg := &dns.Msg{}
msg.Question = []dns.Question{
{Name: container + domain, Qclass: dns.ClassINET, Qtype: dns.TypeA},
}
reply, _, err := client.Exchange(msg, listener.Addr().String())
if err != nil {
t.Fatal(err)
}
expectedReplies := 1
if len(reply.Answer) != expectedReplies {
t.Errorf("wrong number of replies; have %d, want %d", len(reply.Answer), expectedReplies)
}
for _, answer := range reply.Answer {
if !strings.HasSuffix(answer.String(), ip) {
t.Errorf("did not get expected ip in %q", answer.String())
}
}
}
func TestDockerClient_ARecords_NoResults(t *testing.T) {
container := "api"
domain := ".docker."
ip := "127.0.0.1"
listener, dockerClient, _, client := setup(t, domain)
dockerClient.inspectContainer = func(c string) (*docker.Container, error) {
if c != container {
return nil, fmt.Errorf("container does not exist; have %s, want %s:", c, container)
}
return &docker.Container{NetworkSettings: &docker.NetworkSettings{IPAddress: ip}}, nil
}
msg := &dns.Msg{}
msg.Question = []dns.Question{
{Name: "imnothere" + domain, Qclass: dns.ClassINET, Qtype: dns.TypeA},
}
reply, _, err := client.Exchange(msg, listener.Addr().String())
if err != nil {
t.Fatal(err)
}
expectedReplies := 0
if len(reply.Answer) != expectedReplies {
t.Errorf("wrong number of replies; have %d, want %d", len(reply.Answer), expectedReplies)
}
}
func TestDockerClient_MXRecords(t *testing.T) {
container := "api"
domain := ".docker."
ip := "127.0.0.1"
listener, dockerClient, _, client := setup(t, domain)
dockerClient.inspectContainer = func(c string) (*docker.Container, error) {
if c != container {
return nil, fmt.Errorf("container does not exist; have %s, want %s:", c, container)
}
return &docker.Container{NetworkSettings: &docker.NetworkSettings{IPAddress: ip}}, nil
}
msg := &dns.Msg{}
msg.Question = []dns.Question{
{Name: container + domain, Qclass: dns.ClassINET, Qtype: dns.TypeMX},
}
reply, _, err := client.Exchange(msg, listener.Addr().String())
if err != nil {
t.Fatal(err)
}
expectedReplies := 1
if len(reply.Answer) != expectedReplies {
t.Errorf("wrong number of replies; have %d, want %d", len(reply.Answer), expectedReplies)
}
for _, answer := range reply.Answer {
if !strings.HasSuffix(answer.String(), container+domain) {
t.Errorf("did not get expected ip in %q", answer.String())
}
}
}
func TestDockerClient_MXRecords_NoResults(t *testing.T) {
container := "api"
domain := ".docker."
ip := "127.0.0.1"
listener, dockerClient, _, client := setup(t, domain)
dockerClient.inspectContainer = func(c string) (*docker.Container, error) {
if c != container {
return nil, fmt.Errorf("container does not exist; have %s, want %s:", c, container)
}
return &docker.Container{NetworkSettings: &docker.NetworkSettings{IPAddress: ip}}, nil
}
msg := &dns.Msg{}
msg.Question = []dns.Question{
{Name: "imnothere" + domain, Qclass: dns.ClassINET, Qtype: dns.TypeMX},
}
reply, _, err := client.Exchange(msg, listener.Addr().String())
if err != nil {
t.Fatal(err)
}
expectedReplies := 0
if len(reply.Answer) != expectedReplies {
t.Errorf("wrong number of replies; have %d, want %d", len(reply.Answer), expectedReplies)
}
}
func TestDockerClient_PTRRecords(t *testing.T) {
query := "1.0.0.127.in-addr.arpa."
domain := ".docker."
listener, dockerClient, _, client := setup(t, domain)
winner := "winner"
loser := "loser"
dockerClient.inspectContainer = func(s string) (*docker.Container, error) {
containers := map[string]*docker.Container{
"deadbeef": &docker.Container{Name: "/" + loser, NetworkSettings: &docker.NetworkSettings{IPAddress: "127.0.1.1"}},
"beefface": &docker.Container{Name: "/" + winner, NetworkSettings: &docker.NetworkSettings{IPAddress: "127.0.0.1"}},
}
container, ok := containers[s]
if !ok {
return nil, fmt.Errorf("Unexpected container %q", s)
}
return container, nil
}
dockerClient.listContainers = func(docker.ListContainersOptions) ([]docker.APIContainers, error) {
return []docker.APIContainers{
{ID: "deadbeef"},
{ID: "beefface"},
}, nil
}
msg := &dns.Msg{}
msg.Question = []dns.Question{
{Name: query, Qclass: dns.ClassINET, Qtype: dns.TypePTR},
}
reply, _, err := client.Exchange(msg, listener.Addr().String())
if err != nil {
t.Fatal(err)
}
expectedReplies := 1
if len(reply.Answer) != expectedReplies {
t.Errorf("wrong number of replies; have %d, want %d", len(reply.Answer), expectedReplies)
}
for _, answer := range reply.Answer {
if !strings.HasSuffix(answer.String(), winner+domain) {
t.Errorf("did not get expected ip in %q", answer.String())
}
}
}
func TestDockerClient_PTRRecords_NoResults(t *testing.T) {
query := "1.0.0.127.in-addr.arpa."
domain := ".docker."
listener, dockerClient, _, client := setup(t, domain)
dockerClient.listContainers = func(docker.ListContainersOptions) ([]docker.APIContainers, error) {
return []docker.APIContainers{}, nil
}
msg := &dns.Msg{}
msg.Question = []dns.Question{
{Name: query, Qclass: dns.ClassINET, Qtype: dns.TypePTR},
}
reply, _, err := client.Exchange(msg, listener.Addr().String())
if err != nil {
t.Fatal(err)
}
expectedReplies := 0
if len(reply.Answer) != expectedReplies {
t.Errorf("wrong number of replies; have %d, want %d", len(reply.Answer), expectedReplies)
}
}