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package rfc2136
import (
"bytes"
"fmt"
"net"
"strings"
"sync"
"testing"
"time"
"github.com/miekg/dns"
"github.com/xenolf/lego/acme"
)
var (
rfc2136TestDomain = "123456789.www.example.com"
rfc2136TestKeyAuth = "123d=="
rfc2136TestValue = "Now36o-3BmlB623-0c1qCIUmgWVVmDJb88KGl24pqpo"
rfc2136TestFqdn = "_acme-challenge.123456789.www.example.com."
rfc2136TestZone = "example.com."
rfc2136TestTTL = 120
rfc2136TestTsigKey = "example.com."
rfc2136TestTsigSecret = "IwBTJx9wrDp4Y1RyC3H0gA=="
)
var reqChan = make(chan *dns.Msg, 10)
func TestRFC2136CanaryLocalTestServer(t *testing.T) {
acme.ClearFqdnCache()
dns.HandleFunc("example.com.", serverHandlerHello)
defer dns.HandleRemove("example.com.")
server, addrstr, err := runLocalDNSTestServer("127.0.0.1:0", false)
if err != nil {
t.Fatalf("Failed to start test server: %v", err)
}
defer server.Shutdown()
c := new(dns.Client)
m := new(dns.Msg)
m.SetQuestion("example.com.", dns.TypeTXT)
r, _, err := c.Exchange(m, addrstr)
if err != nil || len(r.Extra) == 0 {
t.Fatalf("Failed to communicate with test server: %v", err)
}
txt := r.Extra[0].(*dns.TXT).Txt[0]
if txt != "Hello world" {
t.Error("Expected test server to return 'Hello world' but got: ", txt)
}
}
func TestRFC2136ServerSuccess(t *testing.T) {
acme.ClearFqdnCache()
dns.HandleFunc(rfc2136TestZone, serverHandlerReturnSuccess)
defer dns.HandleRemove(rfc2136TestZone)
server, addrstr, err := runLocalDNSTestServer("127.0.0.1:0", false)
if err != nil {
t.Fatalf("Failed to start test server: %v", err)
}
defer server.Shutdown()
provider, err := NewDNSProviderCredentials(addrstr, "", "", "", "")
if err != nil {
t.Fatalf("Expected NewDNSProviderCredentials() to return no error but the error was -> %v", err)
}
if err := provider.Present(rfc2136TestDomain, "", rfc2136TestKeyAuth); err != nil {
t.Errorf("Expected Present() to return no error but the error was -> %v", err)
}
}
func TestRFC2136ServerError(t *testing.T) {
acme.ClearFqdnCache()
dns.HandleFunc(rfc2136TestZone, serverHandlerReturnErr)
defer dns.HandleRemove(rfc2136TestZone)
server, addrstr, err := runLocalDNSTestServer("127.0.0.1:0", false)
if err != nil {
t.Fatalf("Failed to start test server: %v", err)
}
defer server.Shutdown()
provider, err := NewDNSProviderCredentials(addrstr, "", "", "", "")
if err != nil {
t.Fatalf("Expected NewDNSProviderCredentials() to return no error but the error was -> %v", err)
}
if err := provider.Present(rfc2136TestDomain, "", rfc2136TestKeyAuth); err == nil {
t.Errorf("Expected Present() to return an error but it did not.")
} else if !strings.Contains(err.Error(), "NOTZONE") {
t.Errorf("Expected Present() to return an error with the 'NOTZONE' rcode string but it did not.")
}
}
func TestRFC2136TsigClient(t *testing.T) {
acme.ClearFqdnCache()
dns.HandleFunc(rfc2136TestZone, serverHandlerReturnSuccess)
defer dns.HandleRemove(rfc2136TestZone)
server, addrstr, err := runLocalDNSTestServer("127.0.0.1:0", true)
if err != nil {
t.Fatalf("Failed to start test server: %v", err)
}
defer server.Shutdown()
provider, err := NewDNSProviderCredentials(addrstr, "", rfc2136TestTsigKey, rfc2136TestTsigSecret, "")
if err != nil {
t.Fatalf("Expected NewDNSProviderCredentials() to return no error but the error was -> %v", err)
}
if err := provider.Present(rfc2136TestDomain, "", rfc2136TestKeyAuth); err != nil {
t.Errorf("Expected Present() to return no error but the error was -> %v", err)
}
}
func TestRFC2136ValidUpdatePacket(t *testing.T) {
acme.ClearFqdnCache()
dns.HandleFunc(rfc2136TestZone, serverHandlerPassBackRequest)
defer dns.HandleRemove(rfc2136TestZone)
server, addrstr, err := runLocalDNSTestServer("127.0.0.1:0", false)
if err != nil {
t.Fatalf("Failed to start test server: %v", err)
}
defer server.Shutdown()
txtRR, _ := dns.NewRR(fmt.Sprintf("%s %d IN TXT %s", rfc2136TestFqdn, rfc2136TestTTL, rfc2136TestValue))
rrs := []dns.RR{txtRR}
m := new(dns.Msg)
m.SetUpdate(rfc2136TestZone)
m.RemoveRRset(rrs)
m.Insert(rrs)
expectstr := m.String()
expect, err := m.Pack()
if err != nil {
t.Fatalf("Error packing expect msg: %v", err)
}
provider, err := NewDNSProviderCredentials(addrstr, "", "", "", "")
if err != nil {
t.Fatalf("Expected NewDNSProviderCredentials() to return no error but the error was -> %v", err)
}
if err := provider.Present(rfc2136TestDomain, "", "1234d=="); err != nil {
t.Errorf("Expected Present() to return no error but the error was -> %v", err)
}
rcvMsg := <-reqChan
rcvMsg.Id = m.Id
actual, err := rcvMsg.Pack()
if err != nil {
t.Fatalf("Error packing actual msg: %v", err)
}
if !bytes.Equal(actual, expect) {
tmp := new(dns.Msg)
if err := tmp.Unpack(actual); err != nil {
t.Fatalf("Error unpacking actual msg: %v", err)
}
t.Errorf("Expected msg:\n%s", expectstr)
t.Errorf("Actual msg:\n%v", tmp)
}
}
func runLocalDNSTestServer(listenAddr string, tsig bool) (*dns.Server, string, error) {
pc, err := net.ListenPacket("udp", listenAddr)
if err != nil {
return nil, "", err
}
server := &dns.Server{PacketConn: pc, ReadTimeout: time.Hour, WriteTimeout: time.Hour}
if tsig {
server.TsigSecret = map[string]string{rfc2136TestTsigKey: rfc2136TestTsigSecret}
}
waitLock := sync.Mutex{}
waitLock.Lock()
server.NotifyStartedFunc = waitLock.Unlock
go func() {
server.ActivateAndServe()
pc.Close()
}()
waitLock.Lock()
return server, pc.LocalAddr().String(), nil
}
func serverHandlerHello(w dns.ResponseWriter, req *dns.Msg) {
m := new(dns.Msg)
m.SetReply(req)
m.Extra = make([]dns.RR, 1)
m.Extra[0] = &dns.TXT{
Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 0},
Txt: []string{"Hello world"},
}
w.WriteMsg(m)
}
func serverHandlerReturnSuccess(w dns.ResponseWriter, req *dns.Msg) {
m := new(dns.Msg)
m.SetReply(req)
if req.Opcode == dns.OpcodeQuery && req.Question[0].Qtype == dns.TypeSOA && req.Question[0].Qclass == dns.ClassINET {
// Return SOA to appease findZoneByFqdn()
soaRR, _ := dns.NewRR(fmt.Sprintf("%s %d IN SOA ns1.%s admin.%s 2016022801 28800 7200 2419200 1200", rfc2136TestZone, rfc2136TestTTL, rfc2136TestZone, rfc2136TestZone))
m.Answer = []dns.RR{soaRR}
}
if t := req.IsTsig(); t != nil {
if w.TsigStatus() == nil {
// Validated
m.SetTsig(rfc2136TestZone, dns.HmacMD5, 300, time.Now().Unix())
}
}
w.WriteMsg(m)
}
func serverHandlerReturnErr(w dns.ResponseWriter, req *dns.Msg) {
m := new(dns.Msg)
m.SetRcode(req, dns.RcodeNotZone)
w.WriteMsg(m)
}
func serverHandlerPassBackRequest(w dns.ResponseWriter, req *dns.Msg) {
m := new(dns.Msg)
m.SetReply(req)
if req.Opcode == dns.OpcodeQuery && req.Question[0].Qtype == dns.TypeSOA && req.Question[0].Qclass == dns.ClassINET {
// Return SOA to appease findZoneByFqdn()
soaRR, _ := dns.NewRR(fmt.Sprintf("%s %d IN SOA ns1.%s admin.%s 2016022801 28800 7200 2419200 1200", rfc2136TestZone, rfc2136TestTTL, rfc2136TestZone, rfc2136TestZone))
m.Answer = []dns.RR{soaRR}
}
if t := req.IsTsig(); t != nil {
if w.TsigStatus() == nil {
// Validated
m.SetTsig(rfc2136TestZone, dns.HmacMD5, 300, time.Now().Unix())
}
}
w.WriteMsg(m)
if req.Opcode != dns.OpcodeQuery || req.Question[0].Qtype != dns.TypeSOA || req.Question[0].Qclass != dns.ClassINET {
// Only talk back when it is not the SOA RR.
reqChan <- req
}
}
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