312 lines
7.6 KiB
Go
312 lines
7.6 KiB
Go
package dnsforward
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import (
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"net"
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"testing"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
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"github.com/AdguardTeam/AdGuardHome/internal/filtering"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/dnsproxy/upstream"
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"github.com/AdguardTeam/golibs/netutil"
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"github.com/AdguardTeam/golibs/testutil"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/require"
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)
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// maxDNS64SynTTL is the maximum TTL for synthesized DNS64 responses with no SOA
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// records in seconds.
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//
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// If the SOA RR was not delivered with the negative response to the AAAA query,
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// then the DNS64 SHOULD use the TTL of the original A RR or 600 seconds,
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// whichever is shorter.
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//
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// See https://datatracker.ietf.org/doc/html/rfc6147#section-5.1.7.
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const maxDNS64SynTTL uint32 = 600
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// newRR is a helper that creates a new dns.RR with the given name, qtype, ttl
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// and value. It fails the test if the qtype is not supported or the type of
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// value doesn't match the qtype.
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func newRR(t *testing.T, name string, qtype uint16, ttl uint32, val any) (rr dns.RR) {
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t.Helper()
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switch qtype {
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case dns.TypeA:
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rr = &dns.A{A: testutil.RequireTypeAssert[net.IP](t, val)}
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case dns.TypeAAAA:
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rr = &dns.AAAA{AAAA: testutil.RequireTypeAssert[net.IP](t, val)}
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case dns.TypeCNAME:
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rr = &dns.CNAME{Target: testutil.RequireTypeAssert[string](t, val)}
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case dns.TypeSOA:
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rr = &dns.SOA{
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Ns: "ns." + name,
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Mbox: "hostmaster." + name,
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Serial: 1,
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Refresh: 1,
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Retry: 1,
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Expire: 1,
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Minttl: 1,
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}
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case dns.TypePTR:
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rr = &dns.PTR{Ptr: testutil.RequireTypeAssert[string](t, val)}
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default:
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t.Fatalf("unsupported qtype: %d", qtype)
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}
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*rr.Header() = dns.RR_Header{
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Name: name,
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Rrtype: qtype,
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Class: dns.ClassINET,
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Ttl: ttl,
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}
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return rr
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}
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func TestServer_HandleDNSRequest_dns64(t *testing.T) {
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const (
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ipv4Domain = "ipv4.only."
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ipv6Domain = "ipv6.only."
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soaDomain = "ipv4.soa."
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mappedDomain = "filterable.ipv6."
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anotherDomain = "another.domain."
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pointedDomain = "local1234.ipv4."
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globDomain = "real1234.ipv4."
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)
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someIPv4 := net.IP{1, 2, 3, 4}
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someIPv6 := net.IP{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
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mappedIPv6 := net.ParseIP("64:ff9b::102:304")
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ptr64Domain, err := netutil.IPToReversedAddr(mappedIPv6)
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require.NoError(t, err)
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ptr64Domain = dns.Fqdn(ptr64Domain)
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ptrGlobDomain, err := netutil.IPToReversedAddr(someIPv4)
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require.NoError(t, err)
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ptrGlobDomain = dns.Fqdn(ptrGlobDomain)
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const (
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sectionAnswer = iota
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sectionAuthority
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sectionAdditional
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sectionsNum
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)
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// answerMap is a convenience alias for describing the upstream response for
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// a given question type.
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type answerMap = map[uint16][sectionsNum][]dns.RR
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pt := testutil.PanicT{}
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newUps := func(answers answerMap) (u upstream.Upstream) {
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return aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
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q := req.Question[0]
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require.Contains(pt, answers, q.Qtype)
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answer := answers[q.Qtype]
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resp = (&dns.Msg{}).SetReply(req)
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resp.Answer = answer[sectionAnswer]
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resp.Ns = answer[sectionAuthority]
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resp.Extra = answer[sectionAdditional]
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return resp, nil
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})
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}
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testCases := []struct {
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name string
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qname string
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upsAns answerMap
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wantAns []dns.RR
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qtype uint16
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}{{
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name: "simple_a",
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qname: ipv4Domain,
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upsAns: answerMap{
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dns.TypeA: {
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sectionAnswer: {newRR(t, ipv4Domain, dns.TypeA, 3600, someIPv4)},
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},
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dns.TypeAAAA: {},
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},
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wantAns: []dns.RR{&dns.A{
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Hdr: dns.RR_Header{
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Name: ipv4Domain,
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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Ttl: 3600,
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Rdlength: 4,
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},
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A: someIPv4,
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}},
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qtype: dns.TypeA,
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}, {
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name: "simple_aaaa",
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qname: ipv6Domain,
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upsAns: answerMap{
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dns.TypeA: {},
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dns.TypeAAAA: {
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sectionAnswer: {newRR(t, ipv6Domain, dns.TypeAAAA, 3600, someIPv6)},
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},
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},
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wantAns: []dns.RR{&dns.AAAA{
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Hdr: dns.RR_Header{
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Name: ipv6Domain,
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Rrtype: dns.TypeAAAA,
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Class: dns.ClassINET,
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Ttl: 3600,
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Rdlength: 16,
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},
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AAAA: someIPv6,
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}},
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qtype: dns.TypeAAAA,
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}, {
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name: "actual_dns64",
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qname: ipv4Domain,
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upsAns: answerMap{
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dns.TypeA: {
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sectionAnswer: {newRR(t, ipv4Domain, dns.TypeA, 3600, someIPv4)},
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},
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dns.TypeAAAA: {},
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},
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wantAns: []dns.RR{&dns.AAAA{
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Hdr: dns.RR_Header{
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Name: ipv4Domain,
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Rrtype: dns.TypeAAAA,
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Class: dns.ClassINET,
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Ttl: maxDNS64SynTTL,
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Rdlength: 16,
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},
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AAAA: mappedIPv6,
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}},
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qtype: dns.TypeAAAA,
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}, {
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name: "actual_dns64_soattl",
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qname: soaDomain,
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upsAns: answerMap{
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dns.TypeA: {
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sectionAnswer: {newRR(t, soaDomain, dns.TypeA, 3600, someIPv4)},
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},
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dns.TypeAAAA: {
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sectionAuthority: {newRR(t, soaDomain, dns.TypeSOA, maxDNS64SynTTL+50, nil)},
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},
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},
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wantAns: []dns.RR{&dns.AAAA{
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Hdr: dns.RR_Header{
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Name: soaDomain,
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Rrtype: dns.TypeAAAA,
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Class: dns.ClassINET,
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Ttl: maxDNS64SynTTL + 50,
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Rdlength: 16,
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},
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AAAA: mappedIPv6,
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}},
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qtype: dns.TypeAAAA,
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}, {
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name: "filtered",
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qname: mappedDomain,
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upsAns: answerMap{
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dns.TypeA: {},
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dns.TypeAAAA: {
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sectionAnswer: {
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newRR(t, mappedDomain, dns.TypeAAAA, 3600, net.ParseIP("64:ff9b::506:708")),
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newRR(t, mappedDomain, dns.TypeCNAME, 3600, anotherDomain),
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},
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},
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},
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wantAns: []dns.RR{&dns.CNAME{
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Hdr: dns.RR_Header{
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Name: mappedDomain,
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Rrtype: dns.TypeCNAME,
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Class: dns.ClassINET,
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Ttl: 3600,
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Rdlength: 16,
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},
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Target: anotherDomain,
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}},
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qtype: dns.TypeAAAA,
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}, {
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name: "ptr",
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qname: ptr64Domain,
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upsAns: nil,
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wantAns: []dns.RR{&dns.PTR{
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Hdr: dns.RR_Header{
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Name: ptr64Domain,
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Rrtype: dns.TypePTR,
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Class: dns.ClassINET,
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Ttl: 3600,
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Rdlength: 16,
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},
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Ptr: pointedDomain,
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}},
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qtype: dns.TypePTR,
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}, {
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name: "ptr_glob",
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qname: ptrGlobDomain,
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upsAns: answerMap{
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dns.TypePTR: {
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sectionAnswer: {newRR(t, ptrGlobDomain, dns.TypePTR, 3600, globDomain)},
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},
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},
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wantAns: []dns.RR{&dns.PTR{
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Hdr: dns.RR_Header{
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Name: ptrGlobDomain,
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Rrtype: dns.TypePTR,
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Class: dns.ClassINET,
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Ttl: 3600,
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Rdlength: 15,
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},
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Ptr: globDomain,
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}},
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qtype: dns.TypePTR,
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}}
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localRR := newRR(t, ptr64Domain, dns.TypePTR, 3600, pointedDomain)
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localUps := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
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require.Equal(pt, req.Question[0].Name, ptr64Domain)
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resp = (&dns.Msg{}).SetReply(req)
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resp.Answer = []dns.RR{localRR}
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return resp, nil
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})
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client := &dns.Client{
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Net: "tcp",
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Timeout: 1 * time.Second,
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}
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for _, tc := range testCases {
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// TODO(e.burkov): It seems [proxy.Proxy] isn't intended to be reused
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// right after stop, due to a data race in [proxy.Proxy.Init] method
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// when setting an OOB size. As a temporary workaround, recreate the
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// whole server for each test case.
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s := createTestServer(t, &filtering.Config{
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BlockingMode: filtering.BlockingModeDefault,
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}, ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{{}},
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TCPListenAddrs: []*net.TCPAddr{{}},
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UseDNS64: true,
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Config: Config{
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UpstreamMode: UpstreamModeTypeLoadBalance,
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EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
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},
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ServePlainDNS: true,
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}, localUps)
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t.Run(tc.name, func(t *testing.T) {
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s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newUps(tc.upsAns)}
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startDeferStop(t, s)
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req := (&dns.Msg{}).SetQuestion(tc.qname, tc.qtype)
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resp, _, excErr := client.Exchange(req, s.dnsProxy.Addr(proxy.ProtoTCP).String())
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require.NoError(t, excErr)
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require.Equal(t, tc.wantAns, resp.Answer)
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})
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}
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}
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