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net: avoid infinite recursion in Windows Resolver.lookupTXT
For #33097 Change-Id: I6138dc844f0b29b01c78a02efc1e1b1ad719b803 Reviewed-on: https://go-review.googlesource.com/c/go/+/412139 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com>
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@ -329,7 +329,7 @@ func (r *Resolver) lookupNS(ctx context.Context, name string) ([]*NS, error) {
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func (r *Resolver) lookupTXT(ctx context.Context, name string) ([]string, error) {
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if r.preferGoOverWindows() {
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return r.lookupTXT(ctx, name)
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return r.goLookupTXT(ctx, name)
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}
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// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
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acquireThread()
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@ -6,6 +6,7 @@ package net
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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@ -26,104 +27,117 @@ func toJson(v any) string {
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return string(data)
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}
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func testLookup(t *testing.T, fn func(*testing.T, *Resolver, string)) {
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for _, def := range []bool{true, false} {
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def := def
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for _, server := range nslookupTestServers {
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server := server
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var name string
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if def {
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name = "default/"
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} else {
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name = "go/"
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}
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t.Run(name+server, func(t *testing.T) {
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t.Parallel()
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r := DefaultResolver
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if !def {
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r = &Resolver{PreferGo: true}
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}
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fn(t, r, server)
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})
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}
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}
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}
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func TestNSLookupMX(t *testing.T) {
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testenv.MustHaveExternalNetwork(t)
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for _, server := range nslookupTestServers {
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mx, err := LookupMX(server)
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testLookup(t, func(t *testing.T, r *Resolver, server string) {
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mx, err := r.LookupMX(context.Background(), server)
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if err != nil {
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t.Error(err)
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continue
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t.Fatal(err)
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}
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if len(mx) == 0 {
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t.Errorf("no results")
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continue
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t.Fatal("no results")
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}
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expected, err := nslookupMX(server)
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if err != nil {
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t.Logf("skipping failed nslookup %s test: %s", server, err)
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t.Skipf("skipping failed nslookup %s test: %s", server, err)
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}
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sort.Sort(byPrefAndHost(expected))
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sort.Sort(byPrefAndHost(mx))
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if !reflect.DeepEqual(expected, mx) {
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t.Errorf("different results %s:\texp:%v\tgot:%v", server, toJson(expected), toJson(mx))
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}
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}
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})
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}
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func TestNSLookupCNAME(t *testing.T) {
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testenv.MustHaveExternalNetwork(t)
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for _, server := range nslookupTestServers {
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cname, err := LookupCNAME(server)
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testLookup(t, func(t *testing.T, r *Resolver, server string) {
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cname, err := r.LookupCNAME(context.Background(), server)
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if err != nil {
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t.Errorf("failed %s: %s", server, err)
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continue
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t.Fatalf("failed %s: %s", server, err)
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}
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if cname == "" {
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t.Errorf("no result %s", server)
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t.Fatalf("no result %s", server)
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}
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expected, err := nslookupCNAME(server)
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if err != nil {
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t.Logf("skipping failed nslookup %s test: %s", server, err)
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continue
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t.Skipf("skipping failed nslookup %s test: %s", server, err)
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}
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if expected != cname {
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t.Errorf("different results %s:\texp:%v\tgot:%v", server, expected, cname)
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}
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}
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})
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}
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func TestNSLookupNS(t *testing.T) {
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testenv.MustHaveExternalNetwork(t)
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for _, server := range nslookupTestServers {
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ns, err := LookupNS(server)
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testLookup(t, func(t *testing.T, r *Resolver, server string) {
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ns, err := r.LookupNS(context.Background(), server)
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if err != nil {
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t.Errorf("failed %s: %s", server, err)
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continue
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t.Fatalf("failed %s: %s", server, err)
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}
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if len(ns) == 0 {
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t.Errorf("no results")
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continue
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t.Fatal("no results")
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}
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expected, err := nslookupNS(server)
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if err != nil {
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t.Logf("skipping failed nslookup %s test: %s", server, err)
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continue
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t.Skipf("skipping failed nslookup %s test: %s", server, err)
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}
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sort.Sort(byHost(expected))
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sort.Sort(byHost(ns))
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if !reflect.DeepEqual(expected, ns) {
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t.Errorf("different results %s:\texp:%v\tgot:%v", toJson(server), toJson(expected), ns)
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}
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}
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})
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}
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func TestNSLookupTXT(t *testing.T) {
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testenv.MustHaveExternalNetwork(t)
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for _, server := range nslookupTestServers {
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txt, err := LookupTXT(server)
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testLookup(t, func(t *testing.T, r *Resolver, server string) {
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txt, err := r.LookupTXT(context.Background(), server)
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if err != nil {
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t.Errorf("failed %s: %s", server, err)
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continue
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t.Fatalf("failed %s: %s", server, err)
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}
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if len(txt) == 0 {
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t.Errorf("no results")
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continue
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t.Fatalf("no results")
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}
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expected, err := nslookupTXT(server)
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if err != nil {
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t.Logf("skipping failed nslookup %s test: %s", server, err)
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continue
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t.Skipf("skipping failed nslookup %s test: %s", server, err)
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}
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sort.Strings(expected)
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sort.Strings(txt)
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if !reflect.DeepEqual(expected, txt) {
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t.Errorf("different results %s:\texp:%v\tgot:%v", server, toJson(expected), toJson(txt))
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}
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}
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})
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}
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func TestLookupLocalPTR(t *testing.T) {
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