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// Copyright 2022 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Test that Resolver.Dial can be a func returning an in-memory net.Conn // speaking DNS. package net import ( "bytes" "context" "errors" "fmt" "reflect" "sort" "testing" "time" "golang.org/x/net/dns/dnsmessage" ) func TestResolverDialFunc(t *testing.T) { r := &Resolver{ PreferGo: true, Dial: newResolverDialFunc(&resolverDialHandler{ StartDial: func(network, address string) error { t.Logf("StartDial(%q, %q) ...", network, address) return nil }, Question: func(h dnsmessage.Header, q dnsmessage.Question) { t.Logf("Header: %+v for %q (type=%v, class=%v)", h, q.Name.String(), q.Type, q.Class) }, // TODO: add test without HandleA* hooks specified at all, that Go // doesn't issue retries; map to something terminal. HandleA: func(w AWriter, name string) error { w.AddIP([4]byte{1, 2, 3, 4}) w.AddIP([4]byte{5, 6, 7, 8}) return nil }, HandleAAAA: func(w AAAAWriter, name string) error { w.AddIP([16]byte{1: 1, 15: 15}) w.AddIP([16]byte{2: 2, 14: 14}) return nil }, HandleSRV: func(w SRVWriter, name string) error { w.AddSRV(1, 2, 80, "foo.bar.") w.AddSRV(2, 3, 81, "bar.baz.") return nil }, }), } ctx := context.Background() const fakeDomain = "something-that-is-a-not-a-real-domain.fake-tld." t.Run("LookupIP", func(t *testing.T) { ips, err := r.LookupIP(ctx, "ip", fakeDomain) if err != nil { t.Fatal(err) } if got, want := sortedIPStrings(ips), []string{"0:200::e00", "1.2.3.4", "1::f", "5.6.7.8"}; !reflect.DeepEqual(got, want) { t.Errorf("LookupIP wrong.\n got: %q\nwant: %q\n", got, want) } }) t.Run("LookupSRV", func(t *testing.T) { _, got, err := r.LookupSRV(ctx, "some-service", "tcp", fakeDomain) if err != nil { t.Fatal(err) } want := []*SRV{ { Target: "foo.bar.", Port: 80, Priority: 1, Weight: 2, }, { Target: "bar.baz.", Port: 81, Priority: 2, Weight: 3, }, } if !reflect.DeepEqual(got, want) { t.Errorf("wrong result. got:") for _, r := range got { t.Logf(" - %+v", r) } } }) } func sortedIPStrings(ips []IP) []string { ret := make([]string, len(ips)) for i, ip := range ips { ret[i] = ip.String() } sort.Strings(ret) return ret } func newResolverDialFunc(h *resolverDialHandler) func(ctx context.Context, network, address string) (Conn, error) { return func(ctx context.Context, network, address string) (Conn, error) { a := &resolverFuncConn{ h: h, network: network, address: address, ttl: 10, // 10 second default if unset } if h.StartDial != nil { if err := h.StartDial(network, address); err != nil { return nil, err } } return a, nil } } type resolverDialHandler struct { // StartDial, if non-nil, is called when Go first calls Resolver.Dial. // Any error returned aborts the dial and is returned unwrapped. StartDial func(network, address string) error Question func(dnsmessage.Header, dnsmessage.Question) // err may be ErrNotExist or ErrRefused; others map to SERVFAIL (RCode2). // A nil error means success. HandleA func(w AWriter, name string) error HandleAAAA func(w AAAAWriter, name string) error HandleSRV func(w SRVWriter, name string) error } type ResponseWriter struct{ a *resolverFuncConn } func (w ResponseWriter) header() dnsmessage.ResourceHeader { q := w.a.q return dnsmessage.ResourceHeader{ Name: q.Name, Type: q.Type, Class: q.Class, TTL: w.a.ttl, } } // SetTTL sets the TTL for subsequent written resources. // Once a resource has been written, SetTTL calls are no-ops. // That is, it can only be called at most once, before anything // else is written. func (w ResponseWriter) SetTTL(seconds uint32) { // ... intention is last one wins and mutates all previously // written records too, but that's a little annoying. // But it's also annoying if the requirement is it needs to be set // last. // And it's also annoying if it's possible for users to set // different TTLs per Answer. if w.a.wrote { return } w.a.ttl = seconds } type AWriter struct{ ResponseWriter } func (w AWriter) AddIP(v4 [4]byte) { w.a.wrote = true err := w.a.builder.AResource(w.header(), dnsmessage.AResource{A: v4}) if err != nil { panic(err) } } type AAAAWriter struct{ ResponseWriter } func (w AAAAWriter) AddIP(v6 [16]byte) { w.a.wrote = true err := w.a.builder.AAAAResource(w.header(), dnsmessage.AAAAResource{AAAA: v6}) if err != nil { panic(err) } } type SRVWriter struct{ ResponseWriter } // AddSRV adds a SRV record. The target name must end in a period and // be 63 bytes or fewer. func (w SRVWriter) AddSRV(priority, weight, port uint16, target string) error { targetName, err := dnsmessage.NewName(target) if err != nil { return err } w.a.wrote = true err = w.a.builder.SRVResource(w.header(), dnsmessage.SRVResource{ Priority: priority, Weight: weight, Port: port, Target: targetName, }) if err != nil { panic(err) // internal fault, not user } return nil } var ( ErrNotExist = errors.New("name does not exist") // maps to RCode3, NXDOMAIN ErrRefused = errors.New("refused") // maps to RCode5, REFUSED ) type resolverFuncConn struct { h *resolverDialHandler network string address string builder *dnsmessage.Builder q dnsmessage.Question ttl uint32 wrote bool rbuf bytes.Buffer } func (*resolverFuncConn) Close() error { return nil } func (*resolverFuncConn) LocalAddr() Addr { return someaddr{} } func (*resolverFuncConn) RemoteAddr() Addr { return someaddr{} } func (*resolverFuncConn) SetDeadline(t time.Time) error { return nil } func (*resolverFuncConn) SetReadDeadline(t time.Time) error { return nil } func (*resolverFuncConn) SetWriteDeadline(t time.Time) error { return nil } func (a *resolverFuncConn) Read(p []byte) (n int, err error) { return a.rbuf.Read(p) } func (a *resolverFuncConn) Write(packet []byte) (n int, err error) { if len(packet) < 2 { return 0, fmt.Errorf("short write of %d bytes; want 2+", len(packet)) } reqLen := int(packet[0])<<8 | int(packet[1]) req := packet[2:] if len(req) != reqLen { return 0, fmt.Errorf("packet declared length %d doesn't match body length %d", reqLen, len(req)) } var parser dnsmessage.Parser h, err := parser.Start(req) if err != nil { // TODO: hook return 0, err } q, err := parser.Question() hadQ := (err == nil) if err == nil && a.h.Question != nil { a.h.Question(h, q) } if err != nil && err != dnsmessage.ErrSectionDone { return 0, err } resh := h resh.Response = true resh.Authoritative = true if hadQ { resh.RCode = dnsmessage.RCodeSuccess } else { resh.RCode = dnsmessage.RCodeNotImplemented } a.rbuf.Grow(514) a.rbuf.WriteByte('X') // reserved header for beu16 length a.rbuf.WriteByte('Y') // reserved header for beu16 length builder := dnsmessage.NewBuilder(a.rbuf.Bytes(), resh) a.builder = &builder if hadQ { a.q = q a.builder.StartQuestions() err := a.builder.Question(q) if err != nil { return 0, fmt.Errorf("Question: %w", err) } a.builder.StartAnswers() switch q.Type { case dnsmessage.TypeA: if a.h.HandleA != nil { resh.RCode = mapRCode(a.h.HandleA(AWriter{ResponseWriter{a}}, q.Name.String())) } case dnsmessage.TypeAAAA: if a.h.HandleAAAA != nil { resh.RCode = mapRCode(a.h.HandleAAAA(AAAAWriter{ResponseWriter{a}}, q.Name.String())) } case dnsmessage.TypeSRV: if a.h.HandleSRV != nil { resh.RCode = mapRCode(a.h.HandleSRV(SRVWriter{ResponseWriter{a}}, q.Name.String())) } } } tcpRes, err := builder.Finish() if err != nil { return 0, fmt.Errorf("Finish: %w", err) } n = len(tcpRes) - 2 tcpRes[0] = byte(n >> 8) tcpRes[1] = byte(n) a.rbuf.Write(tcpRes[2:]) return len(packet), nil } type someaddr struct{} func (someaddr) Network() string { return "unused" } func (someaddr) String() string { return "unused-someaddr" } func mapRCode(err error) dnsmessage.RCode { switch err { case nil: return dnsmessage.RCodeSuccess case ErrNotExist: return dnsmessage.RCodeNameError case ErrRefused: return dnsmessage.RCodeRefused default: return dnsmessage.RCodeServerFailure } }