simplify dns.MockResolver, changing MockReq to just a string representing the request

similar to Authentic/Inauthentic

dkim/dkim_test.go

@@ -460,8 +460,8 @@ test
 	})
 	// DNS request is failing temporarily.
 	test(nil, StatusTemperror, ErrDNS, func() {
-		resolver.Fail = map[dns.Mockreq]struct{}{
+		resolver.Fail = []string{
-			{Type: "txt", Name: "test._domainkey.mox.example."}: {},
+			"txt test._domainkey.mox.example.",
 		}
 	})
 	// Claims to be DKIM through v=, but cannot be parsed. ../rfc/6376:2621

dmarc/dmarc_test.go

@@ -21,8 +21,8 @@ func TestLookup(t *testing.T) {
 			"_dmarc.malformed.example.": {"v=DMARC1; p=none; bogus;"},
 			"_dmarc.example.com.":       {"v=DMARC1; p=none;"},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "_dmarc.temperror.example."}: {},
+			"txt _dmarc.temperror.example.",
 		},
 	}
 
@@ -60,8 +60,8 @@ func TestLookupExternalReportsAccepted(t *testing.T) {
 			"example.com._report._dmarc.multiple.example.":  {"v=DMARC1; p=none;", "v=DMARC1"},
 			"example.com._report._dmarc.malformed.example.": {"v=DMARC1; p=none; bogus;"},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "example.com._report._dmarc.temperror.example."}: {},
+			"txt example.com._report._dmarc.temperror.example.",
 		},
 	}
 
@@ -100,8 +100,8 @@ func TestVerify(t *testing.T) {
 			"_dmarc.malformed.example.": {"v=DMARC1; p=none; bogus"},
 			"_dmarc.example.com.":       {"v=DMARC1; p=reject"},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "_dmarc.temperror.example."}: {},
+			"txt _dmarc.temperror.example.",
 		},
 	}
 

dns/mock.go

@@ -20,20 +20,24 @@ type MockResolver struct {
 	MX           map[string][]*net.MX
 	TLSA         map[string][]adns.TLSA // Keys are e.g. _25._tcp.<host>.
 	CNAME        map[string]string
-	Fail         map[Mockreq]struct{}
+	Fail         []string // Records of the form "type name", e.g. "cname localhost." that will return a servfail.
 	AllAuthentic bool     // Default value for authentic in responses. Overridden with Authentic and Inauthentic
-	Authentic    []string // Records of the form "type name", e.g. "cname localhost."
+	Authentic    []string // Like Fail, but records that cause the response to be authentic.
-	Inauthentic  []string
+	Inauthentic  []string // Like Authentic, but making response inauthentic.
 }
 
-type Mockreq struct {
+type mockReq struct {
 	Type string // E.g. "cname", "txt", "mx", "ptr", etc.
 	Name string // Name of request. For TLSA, the full requested DNS name, e.g. _25._tcp.<host>.
 }
 
+func (mr mockReq) String() string {
+	return mr.Type + " " + mr.Name
+}
+
 var _ Resolver = MockResolver{}
 
-func (r MockResolver) result(ctx context.Context, mr Mockreq) (string, adns.Result, error) {
+func (r MockResolver) result(ctx context.Context, mr mockReq) (string, adns.Result, error) {
 	result := adns.Result{Authentic: r.AllAuthentic}
 
 	if err := ctx.Err(); err != nil {
@@ -50,14 +54,14 @@ func (r MockResolver) result(ctx context.Context, mr Mockreq) (string, adns.Resu
 	}
 
 	for {
-		if _, ok := r.Fail[mr]; ok {
+		if slices.Contains(r.Fail, mr.String()) {
-			updateAuthentic(mr.Type + " " + mr.Name)
+			updateAuthentic(mr.String())
 			return mr.Name, adns.Result{}, r.servfail(mr.Name)
 		}
 
 		cname, ok := r.CNAME[mr.Name]
 		if !ok {
-			updateAuthentic(mr.Type + " " + mr.Name)
+			updateAuthentic(mr.String())
 			break
 		}
 		updateAuthentic("cname " + mr.Name)
@@ -95,7 +99,7 @@ func (r MockResolver) LookupPort(ctx context.Context, network, service string) (
 }
 
 func (r MockResolver) LookupCNAME(ctx context.Context, name string) (string, adns.Result, error) {
-	mr := Mockreq{"cname", name}
+	mr := mockReq{"cname", name}
 	name, result, err := r.result(ctx, mr)
 	if err != nil {
 		return name, result, err
@@ -108,7 +112,7 @@ func (r MockResolver) LookupCNAME(ctx context.Context, name string) (string, adn
 }
 
 func (r MockResolver) LookupAddr(ctx context.Context, ip string) ([]string, adns.Result, error) {
-	mr := Mockreq{"ptr", ip}
+	mr := mockReq{"ptr", ip}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err
@@ -121,7 +125,7 @@ func (r MockResolver) LookupAddr(ctx context.Context, ip string) ([]string, adns
 }
 
 func (r MockResolver) LookupNS(ctx context.Context, name string) ([]*net.NS, adns.Result, error) {
-	mr := Mockreq{"ns", name}
+	mr := mockReq{"ns", name}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err
@@ -131,7 +135,7 @@ func (r MockResolver) LookupNS(ctx context.Context, name string) ([]*net.NS, adn
 
 func (r MockResolver) LookupSRV(ctx context.Context, service, proto, name string) (string, []*net.SRV, adns.Result, error) {
 	xname := fmt.Sprintf("_%s._%s.%s", service, proto, name)
-	mr := Mockreq{"srv", xname}
+	mr := mockReq{"srv", xname}
 	name, result, err := r.result(ctx, mr)
 	if err != nil {
 		return name, nil, result, err
@@ -141,7 +145,7 @@ func (r MockResolver) LookupSRV(ctx context.Context, service, proto, name string
 
 func (r MockResolver) LookupIPAddr(ctx context.Context, host string) ([]net.IPAddr, adns.Result, error) {
 	// todo: make closer to resolver, doing a & aaaa lookups, including their error/(in)secure status.
-	mr := Mockreq{"ipaddr", host}
+	mr := mockReq{"ipaddr", host}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err
@@ -164,7 +168,7 @@ func (r MockResolver) LookupIPAddr(ctx context.Context, host string) ([]net.IPAd
 
 func (r MockResolver) LookupHost(ctx context.Context, host string) ([]string, adns.Result, error) {
 	// todo: make closer to resolver, doing a & aaaa lookups, including their error/(in)secure status.
-	mr := Mockreq{"host", host}
+	mr := mockReq{"host", host}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err
@@ -179,7 +183,7 @@ func (r MockResolver) LookupHost(ctx context.Context, host string) ([]string, ad
 }
 
 func (r MockResolver) LookupIP(ctx context.Context, network, host string) ([]net.IP, adns.Result, error) {
-	mr := Mockreq{"ip", host}
+	mr := mockReq{"ip", host}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err
@@ -204,7 +208,7 @@ func (r MockResolver) LookupIP(ctx context.Context, network, host string) ([]net
 }
 
 func (r MockResolver) LookupMX(ctx context.Context, name string) ([]*net.MX, adns.Result, error) {
-	mr := Mockreq{"mx", name}
+	mr := mockReq{"mx", name}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err
@@ -217,7 +221,7 @@ func (r MockResolver) LookupMX(ctx context.Context, name string) ([]*net.MX, adn
 }
 
 func (r MockResolver) LookupTXT(ctx context.Context, name string) ([]string, adns.Result, error) {
-	mr := Mockreq{"txt", name}
+	mr := mockReq{"txt", name}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err
@@ -236,7 +240,7 @@ func (r MockResolver) LookupTLSA(ctx context.Context, port int, protocol string,
 	} else {
 		name = fmt.Sprintf("_%d._%s.%s", port, protocol, host)
 	}
-	mr := Mockreq{"tlsa", name}
+	mr := mockReq{"tlsa", name}
 	_, result, err := r.result(ctx, mr)
 	if err != nil {
 		return nil, result, err

iprev/iprev_test.go

@@ -33,11 +33,11 @@ func TestIPRev(t *testing.T) {
 		AAAA: map[string][]string{
 			"basic6.example.": {"2001:db8::1"},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "ptr", Name: "10.0.0.3"}:           {},
+			"ptr 10.0.0.3",
-			{Type: "ptr", Name: "2001:db8::3"}:        {},
+			"ptr 2001:db8::3",
-			{Type: "ip", Name: "temperror.example."}:  {},
+			"ip temperror.example.",
-			{Type: "ip", Name: "temperror2.example."}: {},
+			"ip temperror2.example.",
 		},
 		Authentic: []string{
 			"ptr 10.0.0.1",

mtasts/mtasts_test.go

@@ -39,9 +39,9 @@ func TestLookup(t *testing.T) {
 			"_mta-sts.b.cnames.example.":        "_mta-sts.c.cnames.example.",
 			"_mta-sts.followtemperror.example.": "_mta-sts.cnametemperror.example.",
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "_mta-sts.temperror.example."}:        {},
+			"txt _mta-sts.temperror.example.",
-			{Type: "cname", Name: "_mta-sts.cnametemperror.example."}: {},
+			"cname _mta-sts.cnametemperror.example.",
 		},
 	}
 

mtastsdb/db_test.go

@@ -117,8 +117,8 @@ func TestDB(t *testing.T) {
 			"_mta-sts.other.example.com.":     {"v=STSv1; id=1"},
 			"_mta-sts.temperror.example.com.": {""},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "_mta-sts.temperror.example.com."}: {},
+			"txt _mta-sts.temperror.example.com.",
 		},
 	}
 

smtpclient/gather_test.go

@@ -73,10 +73,10 @@ func TestGatherDestinations(t *testing.T) {
 			"danglingcname.example.":        "absent.example.", // Points to missing name.
 			"temperror-cname.example.":      "absent.example.",
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "mx", Name: "temperror-mx.example."}:       {},
+			"mx temperror-mx.example.",
-			{Type: "host", Name: "temperror-a.example."}:      {},
+			"host temperror-a.example.",
-			{Type: "cname", Name: "temperror-cname.example."}: {},
+			"cname temperror-cname.example.",
 		},
 		Inauthentic: []string{"cname cnameinauthentic.example."},
 	}
@@ -154,9 +154,9 @@ func TestGatherIPs(t *testing.T) {
 			"danglingcname.example.":        "absent.example.", // Points to missing name.
 			"temperror-cname.example.":      "absent.example.",
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "host", Name: "temperror-a.example."}:      {},
+			"host temperror-a.example.",
-			{Type: "cname", Name: "temperror-cname.example."}: {},
+			"cname temperror-cname.example.",
 		},
 		Inauthentic: []string{"cname cnameinauthentic.example."},
 	}
@@ -241,8 +241,8 @@ func TestGatherTLSA(t *testing.T) {
 			"_25._tcp.cnameinauthentic.example.":     "_25._tcp.host1.example.",
 			"_25._tcp.danglingcname.example.":        "_25._tcp.absent.example.", // Points to missing name.
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "cname", Name: "_25._tcp.temperror-cname.example."}: {},
+			"cname _25._tcp.temperror-cname.example.",
 		},
 		Inauthentic: []string{
 			"cname _25._tcp.cnameinauthentic.example.",

spf/spf_test.go

@@ -22,8 +22,8 @@ func TestLookup(t *testing.T) {
 			"nonspf.example.":    {"something else"},
 			"ok.example.":        {"v=spf1"},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "temperror.example."}: {},
+			"txt temperror.example.",
 		},
 	}
 
@@ -245,7 +245,6 @@ func TestVerify(t *testing.T) {
 				{Host: "mail-c.example.org.", Pref: 10},
 			},
 		},
-		Fail: map[dns.Mockreq]struct{}{},
 	}
 
 	ctx := context.Background()
@@ -441,8 +440,8 @@ func TestVerifyScenarios(t *testing.T) {
 			"2001:db8::1": {"mail.mox.example."},
 			"10.0.1.1":    {"mx1.many-mx.example.", "mx2.many-mx.example.", "mx3.many-mx.example.", "mx4.many-mx.example.", "mx5.many-mx.example.", "mx6.many-mx.example.", "mx7.many-mx.example.", "mx8.many-mx.example.", "mx9.many-mx.example.", "mx10.many-mx.example.", "mx11.many-mx.example."},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "temperror.example."}: {},
+			"txt temperror.example.",
 		},
 	}
 

tlsrpt/lookup_test.go

@@ -18,8 +18,8 @@ func TestLookup(t *testing.T) {
 			"_smtp._tls.malformed.example.": {"v=TLSRPTv1; bad"},
 			"_smtp._tls.other.example.":     {"other"},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "_smtp._tls.temperror.example."}: {},
+			"txt _smtp._tls.temperror.example.",
 		},
 	}
 

updates/updates_test.go

@@ -28,8 +28,8 @@ func TestUpdates(t *testing.T) {
 			"_updates.temperror.example.":  {"v=UPDATES0; l=v0.0.1"},
 			"_updates.unknown.example.":    {"v=UPDATES0; l=v0.0.1; unknown=ok"},
 		},
-		Fail: map[dns.Mockreq]struct{}{
+		Fail: []string{
-			{Type: "txt", Name: "_updates.temperror.example."}: {},
+			"txt _updates.temperror.example.",
 		},
 	}