// 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
}