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|
package zdns
import (
"io/ioutil"
"log"
"net"
"net/http"
"net/http/httptest"
"os"
"reflect"
"testing"
"time"
"github.com/mpolden/zdns/cache"
"github.com/mpolden/zdns/dns"
"github.com/mpolden/zdns/hosts"
)
func init() {
log.SetOutput(ioutil.Discard)
}
const hostsFile1 = `
192.0.2.1 badhost1
2001:db8::1 badhost1
192.0.2.2 badhost2
192.0.2.3 badhost3
`
const hostsFile2 = `
192.0.2.4 badhost4
192.0.2.5 badhost5
192.0.2.6 badhost6
`
func httpHandler(t *testing.T, response string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if _, err := w.Write([]byte(response)); err != nil {
t.Fatal(err)
}
})
}
func httpServer(t *testing.T, s string) *httptest.Server {
return httptest.NewServer(httpHandler(t, s))
}
func tempFile(t *testing.T, s string) (string, error) {
f, err := ioutil.TempFile("", "zdns")
if err != nil {
return "", err
}
defer f.Close()
if err := ioutil.WriteFile(f.Name(), []byte(s), 0644); err != nil {
return "", err
}
return f.Name(), nil
}
func testServer(t *testing.T, refreshInterval time.Duration) (*Server, func()) {
var (
httpSrv *httptest.Server
srv *Server
file string
err error
)
cleanup := func() {
if httpSrv != nil {
httpSrv.Close()
}
if file != "" {
if err := os.Remove(file); err != nil {
t.Error(err)
}
}
if srv != nil {
if err := srv.Close(); err != nil {
t.Error(err)
}
}
}
httpSrv = httpServer(t, hostsFile1)
file, err = tempFile(t, hostsFile2)
if err != nil {
defer cleanup()
t.Fatal(err)
}
config := Config{
DNS: DNSOptions{Listen: "0.0.0.0:53",
hijackMode: HijackZero,
refreshInterval: refreshInterval,
},
Resolver: ResolverOptions{TimeoutString: "0"},
Hosts: []Hosts{
{URL: httpSrv.URL, Hijack: true},
{URL: "file://" + file, Hijack: true},
{Hosts: []string{"192.0.2.5 badhost5"}},
},
}
if err := config.load(); err != nil {
t.Fatal(err)
}
proxy, err := dns.NewProxy(cache.New(0, nil), nil, nil)
if err != nil {
t.Fatal(err)
}
srv, err = NewServer(proxy, config)
if err != nil {
defer cleanup()
t.Fatal(err)
}
ts := time.Now()
for {
srv.mu.RLock()
hostsLoaded := srv.hosts != nil
srv.mu.RUnlock()
if hostsLoaded {
break
}
time.Sleep(10 * time.Millisecond)
if time.Since(ts) > 2*time.Second {
t.Fatal("timed out waiting initial hosts to load")
}
}
return srv, cleanup
}
func TestLoadHosts(t *testing.T) {
s, cleanup := testServer(t, 10*time.Millisecond)
defer cleanup()
want := hosts.Hosts{
"badhost1": []net.IPAddr{{IP: net.ParseIP("192.0.2.1")}, {IP: net.ParseIP("2001:db8::1")}},
"badhost2": []net.IPAddr{{IP: net.ParseIP("192.0.2.2")}},
"badhost3": []net.IPAddr{{IP: net.ParseIP("192.0.2.3")}},
"badhost4": []net.IPAddr{{IP: net.ParseIP("192.0.2.4")}},
"badhost6": []net.IPAddr{{IP: net.ParseIP("192.0.2.6")}},
}
got := s.hosts
if !reflect.DeepEqual(want, got) {
t.Errorf("got %+v, want %+v", got, want)
}
}
func TestReloadHostsOnTick(t *testing.T) {
s, cleanup := testServer(t, 10*time.Millisecond)
defer cleanup()
oldHosts := s.hosts
if oldHosts == nil {
t.Fatal("expected matcher to be initialized")
}
ts := time.Now()
for &s.hosts == &oldHosts {
time.Sleep(10 * time.Millisecond)
if time.Since(ts) > 2*time.Second {
t.Fatal("timed out waiting hosts to load")
}
}
}
func TestNonFqdn(t *testing.T) {
var tests = []struct {
in, out string
}{
{"", ""},
{"foo", "foo"},
{"foo.", "foo"},
}
for i, tt := range tests {
got := nonFqdn(tt.in)
if got != tt.out {
t.Errorf("#%d: nonFqdn(%q) = %q, want %q", i, tt.in, got, tt.out)
}
}
}
func TestHijack(t *testing.T) {
s := &Server{
Config: Config{},
hosts: hosts.Hosts{
"badhost1": []net.IPAddr{
{IP: net.ParseIP("192.0.2.1")},
{IP: net.ParseIP("2001:db8::1")},
},
},
}
var tests = []struct {
rtype uint16
rname string
mode int
out string
}{
{dns.TypeA, "goodhost1", HijackZero, ""}, // Unmatched host
{dns.TypeAAAA, "goodhost1", HijackZero, ""}, // Unmatched host
{15 /* MX */, "badhost1", HijackZero, ""}, // Unmatched type
{dns.TypeA, "badhost1", HijackZero, "badhost1\t3600\tIN\tA\t0.0.0.0"},
{dns.TypeA, "badhost1", HijackEmpty, ""},
{dns.TypeA, "badhost1", HijackHosts, "badhost1\t3600\tIN\tA\t192.0.2.1"},
{dns.TypeAAAA, "badhost1", HijackZero, "badhost1\t3600\tIN\tAAAA\t::"},
{dns.TypeAAAA, "badhost1", HijackEmpty, ""},
{dns.TypeAAAA, "badhost1", HijackHosts, "badhost1\t3600\tIN\tAAAA\t2001:db8::1"},
}
for i, tt := range tests {
s.Config.DNS.hijackMode = tt.mode
req := &dns.Request{Type: tt.rtype, Name: tt.rname}
reply := s.hijack(&dns.Request{Type: tt.rtype, Name: tt.rname})
if reply == nil && tt.out == "" {
reply = &dns.Reply{}
}
if reply.String() != tt.out {
t.Errorf("#%d: hijack(%+v) = %q, want %q", i, req, reply.String(), tt.out)
}
}
}
|
