func setup(t *testing.T) (*MDNSClient, *dns.Server, error) {
InitDefaultLogging(testing.Verbose())
server, err := RunLocalMulticastServer()
if err != nil {
t.Fatalf("Unable to run test server: %s. No default multicast interface?", err)
}
mdnsClient, err := NewMDNSClient()
wt.AssertNoErr(t, err)
err = mdnsClient.Start(nil)
wt.AssertNoErr(t, err)
return mdnsClient, server, err
}
func TestZone(t *testing.T) {
var (
containerID = "deadbeef"
otherContainerID = "cowjuice"
successTestName = "test1.weave."
testAddr1 = "10.2.2.1/24"
)
var zone = NewZoneDb(DefaultLocalDomain)
ip, _, _ := net.ParseCIDR(testAddr1)
err := zone.AddRecord(containerID, successTestName, ip)
wt.AssertNoErr(t, err)
// Add a few more records to make the job harder
err = zone.AddRecord("abcdef0123", "adummy.weave.", net.ParseIP("10.2.0.1"))
wt.AssertNoErr(t, err)
err = zone.AddRecord("0123abcdef", "zdummy.weave.", net.ParseIP("10.2.0.2"))
wt.AssertNoErr(t, err)
// Check that the address is now there.
foundIP, err := zone.LookupName(successTestName)
wt.AssertNoErr(t, err)
if !foundIP[0].IP().Equal(ip) {
t.Fatal("Unexpected result for", successTestName, foundIP)
}
// See if we can find the address by IP.
foundName, err := zone.LookupInaddr("1.2.2.10.in-addr.arpa.")
wt.AssertNoErr(t, err)
if foundName[0].Name() != successTestName {
t.Fatal("Unexpected result for", ip, foundName)
}
err = zone.AddRecord(containerID, successTestName, ip)
wt.AssertErrorType(t, err, (*DuplicateError)(nil), "duplicate add")
err = zone.AddRecord(otherContainerID, successTestName, ip)
// Delete the record for the original container
err = zone.DeleteRecord(containerID, ip)
wt.AssertNoErr(t, err)
_, err = zone.LookupName(successTestName)
wt.AssertNoErr(t, err)
err = zone.DeleteRecord(otherContainerID, ip)
wt.AssertNoErr(t, err)
// Check that the address is not there now.
_, err = zone.LookupName(successTestName)
wt.AssertErrorType(t, err, (*LookupError)(nil), "after deleting record")
// Delete a record that isn't there
err = zone.DeleteRecord(containerID, net.ParseIP("0.0.0.0"))
wt.AssertErrorType(t, err, (*LookupError)(nil), "when deleting record that doesn't exist")
}
// perform a DNS query and assert the reply code, number or answers, etc
func assertExchange(t *testing.T, z string, ty uint16, minAnswers int, maxAnswers int, expErr int) *dns.Msg {
c := new(dns.Client)
c.UDPSize = testUDPBufSize
m := new(dns.Msg)
m.RecursionDesired = true
m.SetQuestion(z, ty)
m.SetEdns0(testUDPBufSize, false) // we don't want to play with truncation here...
r, _, err := c.Exchange(m, fmt.Sprintf("127.0.0.1:%d", testPort))
t.Logf("Response:\n%+v\n", r)
wt.AssertNoErr(t, err)
if minAnswers == 0 && maxAnswers == 0 {
wt.AssertStatus(t, r.Rcode, expErr, "DNS response code")
} else {
wt.AssertStatus(t, r.Rcode, dns.RcodeSuccess, "DNS response code")
}
answers := len(r.Answer)
if minAnswers >= 0 && answers < minAnswers {
wt.Fatalf(t, "Number of answers >= %d", minAnswers)
}
if maxAnswers >= 0 && answers > maxAnswers {
wt.Fatalf(t, "Number of answers <= %d", maxAnswers)
}
return r
}
func (c *testContext) checkResponse(t *testing.T, channelOk bool, resp *Response) {
if !channelOk {
c.channel = nil
return
}
wt.AssertNoErr(t, resp.err)
log.Printf("Got address response %s addr %s", resp.Name(), resp.IP())
c.receivedAddr = resp.IP()
c.receivedCount++
}
func TestAsLookup(t *testing.T) {
mdnsClient, server, _ := setup(t)
defer mdnsClient.Shutdown()
defer server.Shutdown()
ips, err := mdnsClient.LookupName(successTestName)
wt.AssertNoErr(t, err)
if !testAddr.Equal(ips[0].IP()) {
t.Fatalf("Returned address incorrect %s", ips)
}
ips, err = mdnsClient.LookupName("foo.example.com.")
wt.AssertErrorType(t, err, (*LookupError)(nil), "unknown hostname")
names, err := mdnsClient.LookupInaddr(testInAddr)
wt.AssertNoErr(t, err)
if !(successTestName == names[0].Name()) {
t.Fatalf("Expected name %s, got %s", successTestName, names)
}
}
func TestDeleteFor(t *testing.T) {
var (
id = "foobar"
name = "foo.weave."
addr1 = "10.2.2.3/24"
addr2 = "10.2.7.8/24"
)
zone := NewZoneDb(DefaultLocalDomain)
for _, addr := range []string{addr1, addr2} {
ip, _, _ := net.ParseCIDR(addr)
err := zone.AddRecord(id, name, ip)
wt.AssertNoErr(t, err)
}
_, err := zone.LookupName(name)
wt.AssertNoErr(t, err)
err = zone.DeleteRecordsFor(id)
_, err = zone.LookupName(name)
wt.AssertErrorType(t, err, (*LookupError)(nil), "after deleting records for ident")
}
func TestFieldValidator(t *testing.T) {
testMap := map[string]string{"a": "a"}
fv := NewFieldValidator(testMap)
val, err := fv.Value("a")
wt.AssertNoErr(t, err)
wt.AssertNoErr(t, fv.Err())
wt.AssertEqualString(t, val, "a", "")
_, err = fv.Value("x")
wt.AssertFalse(t, err == nil || fv.Err() == nil, "Expected error")
_, err = fv.Value("a")
wt.AssertFalse(t, err == nil || fv.Err() == nil, "Previous error should be retained")
fv = NewFieldValidator(testMap)
err = fv.CheckEqual("a", "a")
wt.AssertNoErr(t, err)
wt.AssertNoErr(t, fv.Err())
err = fv.CheckEqual("a", "b")
wt.AssertFalse(t, err == nil || fv.Err() == nil, "Expected error")
err = fv.CheckEqual("a", "a")
wt.AssertFalse(t, err == nil || fv.Err() == nil, "Previous error should be retained")
}
func TestAddrs(t *testing.T) {
InitDefaultLogging(testing.Verbose())
Info.Println("TestAddrs starting")
ip, err := addrToIPv4("10.13.12.11")
wt.AssertNoErr(t, err)
wt.AssertTrue(t, net.ParseIP("10.13.12.11").Equal(ip.toNetIP()), "IP")
ip, err = raddrToIPv4("11.12.13.10.in-addr.arpa.")
wt.AssertNoErr(t, err)
wt.AssertTrue(t, net.ParseIP("10.13.12.11").Equal(ip.toNetIP()), "IP")
// some malformed addresses
ip, err = addrToIPv4("10.13.12")
wt.AssertTrue(t, err != nil, "when parsing malformed address")
ip, err = addrToIPv4("10.13.AA.12")
wt.AssertTrue(t, err != nil, "when parsing malformed address")
ip, err = raddrToIPv4("11.12.13.10.in-axxx.arpa.")
wt.AssertTrue(t, err != nil, "when parsing malformed address")
ip, err = raddrToIPv4("11.12.13.10.in-addr")
wt.AssertTrue(t, err != nil, "when parsing malformed address")
}
// Check that the cache keeps its intended capacity constant
func TestCacheLength(t *testing.T) {
InitDefaultLogging(testing.Verbose())
Info.Println("TestCacheLength starting")
const cacheLen = 128
l, err := NewCache(cacheLen, nil)
wt.AssertNoErr(t, err)
insTime := time.Now()
t.Logf("Inserting 256 questions in the cache at '%s', with TTL from 0 to 255", insTime)
for i := 0; i < cacheLen*2; i++ {
name := fmt.Sprintf("name%d", i)
questionMsg := new(dns.Msg)
questionMsg.SetQuestion(name, dns.TypeA)
questionMsg.RecursionDesired = true
question := &questionMsg.Question[0]
ip := net.ParseIP(fmt.Sprintf("10.0.1.%d", i))
records := []ZoneRecord{Record{name, ip, 0, 0, 0}}
reply := makeAddressReply(questionMsg, question, records)
reply.Answer[0].Header().Ttl = uint32(i)
l.Put(questionMsg, reply, 0, 0)
}
wt.AssertEqualInt(t, l.Len(), cacheLen, "cache length")
minExpectedTime := insTime.Add(time.Duration(cacheLen) * time.Second)
t.Logf("Checking all remaining entries expire after insert_time + %d secs='%s'", cacheLen, minExpectedTime)
for _, entry := range l.entries {
if entry.validUntil.Before(minExpectedTime) {
t.Fatalf("Entry valid until %s", entry.validUntil)
}
}
}
func TestServerSimpleQuery(t *testing.T) {
var (
testRecord1 = Record{"test.weave.local.", net.ParseIP("10.20.20.10"), 0, 0, 0}
testRecord2 = Record{"test.weave.local.", net.ParseIP("10.20.20.20"), 0, 0, 0}
testInAddr1 = "10.20.20.10.in-addr.arpa."
)
InitDefaultLogging(testing.Verbose())
Info.Println("TestServerSimpleQuery starting")
mzone := newMockedZoneWithRecords([]ZoneRecord{testRecord1, testRecord2})
mdnsServer, err := NewMDNSServer(mzone)
wt.AssertNoErr(t, err)
err = mdnsServer.Start(nil)
wt.AssertNoErr(t, err)
defer mdnsServer.Stop()
receivedAddrs := make([]net.IP, 0)
receivedName := ""
recvChan := make(chan interface{})
receivedCount := 0
// Implement a minimal listener for responses
multicast, err := LinkLocalMulticastListener(nil)
wt.AssertNoErr(t, err)
handleMDNS := func(w dns.ResponseWriter, r *dns.Msg) {
// Only handle responses here
if len(r.Answer) > 0 {
t.Logf("Received %d answer(s)", len(r.Answer))
for _, answer := range r.Answer {
switch rr := answer.(type) {
case *dns.A:
t.Logf("... A:\n%+v", rr)
receivedAddrs = append(receivedAddrs, rr.A)
receivedCount++
case *dns.PTR:
t.Logf("... PTR:\n%+v", rr)
receivedName = rr.Ptr
receivedCount++
}
}
recvChan <- "ok"
}
}
sendQuery := func(name string, querytype uint16) {
receivedAddrs = make([]net.IP, 0)
receivedName = ""
receivedCount = 0
recvChan = make(chan interface{})
m := new(dns.Msg)
m.SetQuestion(name, querytype)
m.RecursionDesired = false
buf, err := m.Pack()
wt.AssertNoErr(t, err)
conn, err := net.ListenUDP("udp4", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
wt.AssertNoErr(t, err)
Debug.Printf("Sending UDP packet to %s", ipv4Addr)
_, err = conn.WriteTo(buf, ipv4Addr)
wt.AssertNoErr(t, err)
Debug.Printf("Waiting for response")
select {
case <-recvChan:
return
case <-time.After(100 * time.Millisecond):
Debug.Printf("Timeout while waiting for response")
return
}
}
listener := &dns.Server{
Unsafe: true,
PacketConn: multicast,
Handler: dns.HandlerFunc(handleMDNS),
ReadTimeout: 100 * time.Millisecond}
go listener.ActivateAndServe()
defer listener.Shutdown()
time.Sleep(100 * time.Millisecond) // Allow for server to get going
Debug.Printf("Checking that we get 2 IPs fo name '%s' [A]", testRecord1.Name())
sendQuery(testRecord1.Name(), dns.TypeA)
if receivedCount != 2 {
t.Fatalf("Unexpected result count %d for %s", receivedCount, testRecord1.Name())
}
if !(receivedAddrs[0].Equal(testRecord1.IP()) || receivedAddrs[0].Equal(testRecord2.IP())) {
t.Fatalf("Unexpected result %s for %s", receivedAddrs, testRecord1.Name())
}
if !(receivedAddrs[1].Equal(testRecord1.IP()) || receivedAddrs[1].Equal(testRecord2.IP())) {
t.Fatalf("Unexpected result %s for %s", receivedAddrs, testRecord1.Name())
}
Debug.Printf("Checking that 'testfail.weave.' [A] gets no answers")
sendQuery("testfail.weave.", dns.TypeA)
if receivedCount != 0 {
t.Fatalf("Unexpected result count %d for testfail.weave", receivedCount)
}
Debug.Printf("Checking that '%s' [PTR] gets one name", testInAddr1)
sendQuery(testInAddr1, dns.TypePTR)
if receivedCount != 1 {
t.Fatalf("Expected an answer to %s, got %d answers", testInAddr1, receivedCount)
} else if !(testRecord1.Name() == receivedName) {
t.Fatalf("Expected answer %s to query for %s, got %s", testRecord1.Name(), testInAddr1, receivedName)
}
}
// Check that the cache entries are ok
func TestCacheEntries(t *testing.T) {
InitDefaultLogging(testing.Verbose())
Info.Println("TestCacheEntries starting")
Info.Println("Checking cache consistency")
const cacheLen = 128
clk := clock.NewMock()
l, err := NewCache(cacheLen, clk)
wt.AssertNoErr(t, err)
questionMsg := new(dns.Msg)
questionMsg.SetQuestion("some.name", dns.TypeA)
questionMsg.RecursionDesired = true
question := &questionMsg.Question[0]
t.Logf("Trying to get a name")
resp, err := l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
if resp != nil {
t.Logf("Got\n%s", resp)
t.Fatalf("ERROR: Did not expect a reponse from Get() yet")
}
t.Logf("Trying to get it again")
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
if resp != nil {
t.Logf("Got\n%s", resp)
t.Fatalf("ERROR: Did not expect a reponse from Get() yet")
}
t.Logf("Inserting the reply")
records := []ZoneRecord{Record{"some.name", net.ParseIP("10.0.1.1"), 0, 0, 0}}
reply1 := makeAddressReply(questionMsg, question, records)
l.Put(questionMsg, reply1, nullTTL, 0)
t.Logf("Checking we can Get() the reply now")
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
wt.AssertTrue(t, resp != nil, "reponse from Get()")
t.Logf("Received '%s'", resp.Answer[0])
wt.AssertType(t, resp.Answer[0], (*dns.A)(nil), "DNS record")
ttlGet1 := resp.Answer[0].Header().Ttl
clk.Add(time.Duration(1) * time.Second)
t.Logf("Checking that a second Get(), after 1 second, gets the same result, but with reduced TTL")
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
wt.AssertTrue(t, resp != nil, "reponse from a second Get()")
t.Logf("Received '%s'", resp.Answer[0])
wt.AssertType(t, resp.Answer[0], (*dns.A)(nil), "DNS record")
ttlGet2 := resp.Answer[0].Header().Ttl
wt.AssertEqualInt(t, int(ttlGet1-ttlGet2), 1, "TTL difference")
clk.Add(time.Duration(localTTL) * time.Second)
t.Logf("Checking that a third Get(), after %d second, gets no result", localTTL)
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
if resp != nil {
t.Logf("Got\n%s", resp)
t.Fatalf("ERROR: Did NOT expect a reponse from the second Get()")
}
t.Logf("Checking that an Remove() results in Get() returning nothing")
records = []ZoneRecord{Record{"some.name", net.ParseIP("10.0.9.9"), 0, 0, 0}}
replyTemp := makeAddressReply(questionMsg, question, records)
l.Put(questionMsg, replyTemp, nullTTL, 0)
lenBefore := l.Len()
l.Remove(question)
wt.AssertEqualInt(t, l.Len(), lenBefore-1, "cache length")
l.Remove(question) // do it again: should have no effect...
wt.AssertEqualInt(t, l.Len(), lenBefore-1, "cache length")
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
wt.AssertTrue(t, resp == nil, "reponse from the Get() after a Remove()")
t.Logf("Inserting a two replies for the same query")
records = []ZoneRecord{Record{"some.name", net.ParseIP("10.0.1.2"), 0, 0, 0}}
reply2 := makeAddressReply(questionMsg, question, records)
l.Put(questionMsg, reply2, nullTTL, 0)
clk.Add(time.Duration(1) * time.Second)
records = []ZoneRecord{Record{"some.name", net.ParseIP("10.0.1.3"), 0, 0, 0}}
reply3 := makeAddressReply(questionMsg, question, records)
l.Put(questionMsg, reply3, nullTTL, 0)
t.Logf("Checking we get the last one...")
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
wt.AssertTrue(t, resp != nil, "reponse from the Get()")
t.Logf("Received '%s'", resp.Answer[0])
wt.AssertType(t, resp.Answer[0], (*dns.A)(nil), "DNS record")
wt.AssertEqualString(t, resp.Answer[0].(*dns.A).A.String(), "10.0.1.3", "IP address")
wt.AssertEqualInt(t, int(resp.Answer[0].Header().Ttl), int(localTTL), "TTL")
clk.Add(time.Duration(localTTL-1) * time.Second)
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
wt.AssertTrue(t, resp != nil, "reponse from the Get()")
t.Logf("Received '%s'", resp.Answer[0])
wt.AssertType(t, resp.Answer[0], (*dns.A)(nil), "DNS record")
wt.AssertEqualString(t, resp.Answer[0].(*dns.A).A.String(), "10.0.1.3", "IP address")
wt.AssertEqualInt(t, int(resp.Answer[0].Header().Ttl), 1, "TTL")
t.Logf("Checking we get empty replies when they are expired...")
lenBefore = l.Len()
clk.Add(time.Duration(localTTL) * time.Second)
resp, err = l.Get(questionMsg, minUDPSize)
wt.AssertNoErr(t, err)
if resp != nil {
t.Logf("Got\n%s", resp.Answer[0])
t.Fatalf("ERROR: Did NOT expect a reponse from the Get()")
}
wt.AssertEqualInt(t, l.Len(), lenBefore-1, "cache length (after getting an expired entry)")
questionMsg2 := new(dns.Msg)
questionMsg2.SetQuestion("some.other.name", dns.TypeA)
questionMsg2.RecursionDesired = true
question2 := &questionMsg2.Question[0]
t.Logf("Trying to Get() a name")
resp, err = l.Get(questionMsg2, minUDPSize)
wt.AssertNoErr(t, err)
wt.AssertNil(t, resp, "reponse from Get() yet")
t.Logf("Checking that an Remove() between Get() and Put() does not break things")
records = []ZoneRecord{Record{"some.name", net.ParseIP("10.0.9.9"), 0, 0, 0}}
replyTemp2 := makeAddressReply(questionMsg2, question2, records)
l.Remove(question2)
l.Put(questionMsg2, replyTemp2, nullTTL, 0)
resp, err = l.Get(questionMsg2, minUDPSize)
wt.AssertNoErr(t, err)
wt.AssertNotNil(t, resp, "reponse from Get()")
questionMsg3 := new(dns.Msg)
questionMsg3.SetQuestion("some.other.name", dns.TypeA)
questionMsg3.RecursionDesired = true
question3 := &questionMsg3.Question[0]
t.Logf("Checking that a entry with CacheNoLocalReplies return an error")
l.Put(questionMsg3, nil, nullTTL, CacheNoLocalReplies)
resp, err = l.Get(questionMsg3, minUDPSize)
wt.AssertNil(t, resp, "Get() response with CacheNoLocalReplies")
wt.AssertNotNil(t, err, "Get() error with CacheNoLocalReplies")
clk.Add(time.Second * time.Duration(negLocalTTL+1))
t.Logf("Checking that we get an expired response after %f seconds", negLocalTTL)
resp, err = l.Get(questionMsg3, minUDPSize)
wt.AssertNil(t, resp, "expired Get() response with CacheNoLocalReplies")
wt.AssertNil(t, err, "expired Get() error with CacheNoLocalReplies")
l.Remove(question3)
t.Logf("Checking that Put&Get with CacheNoLocalReplies with a Remove in the middle returns nothing")
l.Put(questionMsg3, nil, nullTTL, CacheNoLocalReplies)
l.Remove(question3)
resp, err = l.Get(questionMsg3, minUDPSize)
wt.AssertNil(t, resp, "Get() reponse with CacheNoLocalReplies")
wt.AssertNil(t, err, "Get() error with CacheNoLocalReplies")
}
func TestUDPDNSServer(t *testing.T) {
setupForTest(t)
const (
containerID = "foobar"
successTestName = "test1.weave.local."
failTestName = "test2.weave.local."
nonLocalName = "weave.works."
testAddr1 = "10.2.2.1"
)
testCIDR1 := testAddr1 + "/24"
InitDefaultLogging(true)
var zone = NewZoneDb(DefaultLocalDomain)
ip, _, _ := net.ParseCIDR(testCIDR1)
zone.AddRecord(containerID, successTestName, ip)
fallbackHandler := func(w dns.ResponseWriter, req *dns.Msg) {
m := new(dns.Msg)
m.SetReply(req)
if len(req.Question) == 1 {
q := req.Question[0]
if q.Name == nonLocalName && q.Qtype == dns.TypeMX {
m.Answer = make([]dns.RR, 1)
m.Answer[0] = &dns.MX{Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeMX, Class: dns.ClassINET, Ttl: 0}, Mx: "mail." + nonLocalName}
} else if q.Name == nonLocalName && q.Qtype == dns.TypeANY {
m.Answer = make([]dns.RR, 512/len("mailn."+nonLocalName)+1)
for i := range m.Answer {
m.Answer[i] = &dns.MX{Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeMX, Class: dns.ClassINET, Ttl: 0}, Mx: fmt.Sprintf("mail%d.%s", i, nonLocalName)}
}
} else if q.Name == testRDNSnonlocal && q.Qtype == dns.TypePTR {
m.Answer = make([]dns.RR, 1)
m.Answer[0] = &dns.PTR{Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypePTR, Class: dns.ClassINET, Ttl: 0}, Ptr: "ns1.google.com."}
} else if q.Name == testRDNSfail && q.Qtype == dns.TypePTR {
m.Rcode = dns.RcodeNameError
}
}
w.WriteMsg(m)
}
// Run another DNS server for fallback
s, fallbackAddr, err := runLocalUDPServer(t, "127.0.0.1:0", fallbackHandler)
wt.AssertNoErr(t, err)
defer s.Shutdown()
_, fallbackPort, err := net.SplitHostPort(fallbackAddr)
wt.AssertNoErr(t, err)
config := &dns.ClientConfig{Servers: []string{"127.0.0.1"}, Port: fallbackPort}
srv, err := NewDNSServer(DNSServerConfig{UpstreamCfg: config, Port: testPort}, zone, nil)
wt.AssertNoErr(t, err)
defer srv.Stop()
go srv.Start()
time.Sleep(100 * time.Millisecond) // Allow sever goroutine to start
var r *dns.Msg
r = assertExchange(t, successTestName, dns.TypeA, 1, 1, 0)
wt.AssertType(t, r.Answer[0], (*dns.A)(nil), "DNS record")
wt.AssertEqualString(t, r.Answer[0].(*dns.A).A.String(), testAddr1, "IP address")
assertExchange(t, failTestName, dns.TypeA, 0, 0, dns.RcodeNameError)
r = assertExchange(t, testRDNSsuccess, dns.TypePTR, 1, 1, 0)
wt.AssertType(t, r.Answer[0], (*dns.PTR)(nil), "DNS record")
wt.AssertEqualString(t, r.Answer[0].(*dns.PTR).Ptr, successTestName, "IP address")
assertExchange(t, testRDNSfail, dns.TypePTR, 0, 0, dns.RcodeNameError)
// This should fail because we don't have information about MX records
assertExchange(t, successTestName, dns.TypeMX, 0, 0, dns.RcodeNameError)
// This non-local query for an MX record should succeed by being
// passed on to the fallback server
assertExchange(t, nonLocalName, dns.TypeMX, 1, -1, 0)
// Now ask a query that we expect to return a lot of data.
assertExchange(t, nonLocalName, dns.TypeANY, 5, -1, 0)
assertExchange(t, testRDNSnonlocal, dns.TypePTR, 1, -1, 0)
// Not testing MDNS functionality of server here (yet), since it
// needs two servers, each listening on its own address
}
func TestTCPDNSServer(t *testing.T) {
setupForTest(t)
const (
numAnswers = 512
nonLocalName = "weave.works."
)
dnsAddr := fmt.Sprintf("localhost:%d", testPort)
InitDefaultLogging(true)
var zone = NewZoneDb(DefaultLocalDomain)
// generate a list of `numAnswers` IP addresses
var addrs []ZoneRecord
bs := make([]byte, 4)
for i := 0; i < numAnswers; i++ {
binary.LittleEndian.PutUint32(bs, uint32(i))
addrs = append(addrs, Record{"", net.IPv4(bs[0], bs[1], bs[2], bs[3]), 0, 0, 0})
}
// handler for the fallback server: it will just return a very long response
fallbackUDPHandler := func(w dns.ResponseWriter, req *dns.Msg) {
maxLen := getMaxReplyLen(req, protUDP)
t.Logf("Fallback UDP server got asked: returning %d answers", numAnswers)
q := req.Question[0]
m := makeAddressReply(req, &q, addrs)
mLen := m.Len()
m.SetEdns0(uint16(maxLen), false)
if mLen > maxLen {
t.Logf("... truncated response (%d > %d)", mLen, maxLen)
m.Truncated = true
}
w.WriteMsg(m)
}
fallbackTCPHandler := func(w dns.ResponseWriter, req *dns.Msg) {
t.Logf("Fallback TCP server got asked: returning %d answers", numAnswers)
q := req.Question[0]
m := makeAddressReply(req, &q, addrs)
w.WriteMsg(m)
}
t.Logf("Running a DNS fallback server with UDP")
us, fallbackUDPAddr, err := runLocalUDPServer(t, "127.0.0.1:0", fallbackUDPHandler)
wt.AssertNoErr(t, err)
defer us.Shutdown()
_, fallbackPort, err := net.SplitHostPort(fallbackUDPAddr)
wt.AssertNoErr(t, err)
t.Logf("Starting another fallback server, with TCP, on the same port as the UDP server")
fallbackTCPAddr := fmt.Sprintf("127.0.0.1:%s", fallbackPort)
ts, fallbackTCPAddr, err := runLocalTCPServer(t, fallbackTCPAddr, fallbackTCPHandler)
wt.AssertNoErr(t, err)
defer ts.Shutdown()
t.Logf("Creating a WeaveDNS server instance, falling back to 127.0.0.1:%s", fallbackPort)
config := &dns.ClientConfig{Servers: []string{"127.0.0.1"}, Port: fallbackPort}
srv, err := NewDNSServer(DNSServerConfig{UpstreamCfg: config, Port: testPort}, zone, nil)
wt.AssertNoErr(t, err)
defer srv.Stop()
go srv.Start()
time.Sleep(100 * time.Millisecond) // Allow sever goroutine to start
t.Logf("Creating a UDP and a TCP client")
uc := new(dns.Client)
uc.UDPSize = minUDPSize
tc := new(dns.Client)
tc.Net = "tcp"
t.Logf("Creating DNS query message")
m := new(dns.Msg)
m.RecursionDesired = true
m.SetQuestion(nonLocalName, dns.TypeA)
t.Logf("Checking the fallback server at %s returns a truncated response with UDP", fallbackUDPAddr)
r, _, err := uc.Exchange(m, fallbackUDPAddr)
t.Logf("Got response from fallback server (UDP) with %d answers", len(r.Answer))
t.Logf("Response:\n%+v\n", r)
wt.AssertNoErr(t, err)
wt.AssertTrue(t, r.MsgHdr.Truncated, "DNS truncated reponse flag")
wt.AssertNotEqualInt(t, len(r.Answer), numAnswers, "number of answers (UDP)")
t.Logf("Checking the WeaveDNS server at %s returns a truncated reponse with UDP", dnsAddr)
r, _, err = uc.Exchange(m, dnsAddr)
t.Logf("UDP Response:\n%+v\n", r)
wt.AssertNoErr(t, err)
wt.AssertNotNil(t, r, "response")
t.Logf("%d answers", len(r.Answer))
wt.AssertTrue(t, r.MsgHdr.Truncated, "DNS truncated reponse flag")
wt.AssertNotEqualInt(t, len(r.Answer), numAnswers, "number of answers (UDP)")
t.Logf("Checking the WeaveDNS server at %s does not return a truncated reponse with TCP", dnsAddr)
r, _, err = tc.Exchange(m, dnsAddr)
t.Logf("TCP Response:\n%+v\n", r)
wt.AssertNoErr(t, err)
wt.AssertNotNil(t, r, "response")
t.Logf("%d answers", len(r.Answer))
wt.AssertFalse(t, r.MsgHdr.Truncated, "DNS truncated response flag")
wt.AssertEqualInt(t, len(r.Answer), numAnswers, "number of answers (TCP)")
t.Logf("Checking the WeaveDNS server at %s does not return a truncated reponse with UDP with a bigger buffer", dnsAddr)
m.SetEdns0(testUDPBufSize, false)
r, _, err = uc.Exchange(m, dnsAddr)
t.Logf("UDP-large Response:\n%+v\n", r)
wt.AssertNoErr(t, err)
wt.AssertNotNil(t, r, "response")
t.Logf("%d answers", len(r.Answer))
wt.AssertNoErr(t, err)
wt.AssertFalse(t, r.MsgHdr.Truncated, "DNS truncated response flag")
wt.AssertEqualInt(t, len(r.Answer), numAnswers, "number of answers (UDP-long)")
}
func TestHttp(t *testing.T) {
var (
containerID = "deadbeef"
testDomain = "weave.local."
successTestName = "test1." + testDomain
testAddr1 = "10.2.2.1/24"
dockerIP = "9.8.7.6"
)
zone := NewZoneDb(DefaultLocalDomain)
port := rand.Intn(10000) + 32768
fmt.Println("Http test on port", port)
go ListenHTTP("", nil, testDomain, zone, port)
time.Sleep(100 * time.Millisecond) // Allow for http server to get going
// Ask the http server to add our test address into the database
addrParts := strings.Split(testAddr1, "/")
addrURL := fmt.Sprintf("http://localhost:%d/name/%s/%s", port, containerID, addrParts[0])
resp, err := genForm("PUT", addrURL,
url.Values{"fqdn": {successTestName}, "local_ip": {dockerIP}, "routing_prefix": {addrParts[1]}})
wt.AssertNoErr(t, err)
wt.AssertStatus(t, resp.StatusCode, http.StatusOK, "http response")
// Check that the address is now there.
ip, _, _ := net.ParseCIDR(testAddr1)
foundIP, err := zone.LookupName(successTestName)
wt.AssertNoErr(t, err)
if !foundIP[0].IP().Equal(ip) {
t.Fatalf("Unexpected result for %s: received %s, expected %s", successTestName, foundIP, ip)
}
// Adding exactly the same address should be OK
resp, err = genForm("PUT", addrURL,
url.Values{"fqdn": {successTestName}, "local_ip": {dockerIP}, "routing_prefix": {addrParts[1]}})
wt.AssertNoErr(t, err)
wt.AssertStatus(t, resp.StatusCode, http.StatusOK, "http success response for duplicate add")
// Now try adding the same address again with a different ident --
// again should be fine
otherURL := fmt.Sprintf("http://localhost:%d/name/%s/%s", port, "other", addrParts[0])
resp, err = genForm("PUT", otherURL,
url.Values{"fqdn": {successTestName}, "local_ip": {dockerIP}, "routing_prefix": {addrParts[1]}})
wt.AssertNoErr(t, err)
wt.AssertStatus(t, resp.StatusCode, http.StatusOK, "http response")
// Delete the address
resp, err = genForm("DELETE", addrURL, nil)
wt.AssertNoErr(t, err)
wt.AssertStatus(t, resp.StatusCode, http.StatusOK, "http response")
// Check that the address is still resolvable.
x, err := zone.LookupName(successTestName)
t.Logf("Got %s", x)
wt.AssertNoErr(t, err)
// Delete the address record mentioning the other container
resp, err = genForm("DELETE", otherURL, nil)
wt.AssertNoErr(t, err)
wt.AssertStatus(t, resp.StatusCode, http.StatusOK, "http response")
// Check that the address is gone
x, err = zone.LookupName(successTestName)
t.Logf("Got %s", x)
wt.AssertErrorType(t, err, (*LookupError)(nil), "fully-removed address")
// Would like to shut down the http server at the end of this test
// but it's complicated.
// See https://groups.google.com/forum/#!topic/golang-nuts/vLHWa5sHnCE
}
