Add IPv6 AAAA record support to PiHole provider

docs/tutorials/pihole.md

@@ -1,7 +1,7 @@
 # Setting up ExternalDNS for Pi-hole
 
 This tutorial describes how to setup ExternalDNS to sync records with Pi-hole's Custom DNS.
-Pi-hole has an internal list it checks last when resolving requests. This list can contain any number of arbitrary A or CNAME records.
+Pi-hole has an internal list it checks last when resolving requests. This list can contain any number of arbitrary A, AAAA or CNAME records.
 There is a pseudo-API exposed that ExternalDNS is able to use to manage these records.
 
 __NOTE:__ Your Pi-hole must be running [version 5.9 or newer](https://pi-hole.net/blog/2022/02/12/pi-hole-ftl-v5-14-web-v5-11-and-core-v5-9-released).
@@ -91,7 +91,7 @@ spec:
         args:
         - --source=service
         - --source=ingress
-        # Pihole only supports A/CNAME records so there is no mechanism to track ownership.
+        # Pihole only supports A/AAAA/CNAME records so there is no mechanism to track ownership.
         # You don't need to set this flag, but if you leave it unset, you will receive warning
         # logs when ExternalDNS attempts to create TXT records.
         - --registry=noop

provider/pihole/client.go

@@ -145,13 +145,24 @@ func (p *piholeClient) listRecords(ctx context.Context, rtype string) ([]*endpoi
 	if !ok {
 		return out, nil
 	}
+loop:
 	for _, rec := range data {
 		name := rec[0]
 		target := rec[1]
 		if !p.cfg.DomainFilter.Match(name) {
 			log.Debugf("Skipping %s that does not match domain filter", name)
 			continue
 		}
+		switch rtype {
+		case endpoint.RecordTypeA:
+			if strings.Contains(target, ":") {
+				continue loop
+			}
+		case endpoint.RecordTypeAAAA:
+			if strings.Contains(target, ".") {
+				continue loop
+			}
+		}
 		out = append(out, &endpoint.Endpoint{
 			DNSName:    name,
 			Targets:    []string{target},
@@ -180,7 +191,7 @@ func (p *piholeClient) cnameRecordsScript() string {
 
 func (p *piholeClient) urlForRecordType(rtype string) (string, error) {
 	switch rtype {
-	case endpoint.RecordTypeA:
+	case endpoint.RecordTypeA, endpoint.RecordTypeAAAA:
 		return p.aRecordsScript(), nil
 	case endpoint.RecordTypeCNAME:
 		return p.cnameRecordsScript(), nil
@@ -287,7 +298,7 @@ func (p *piholeClient) newDNSActionForm(action string, ep *endpoint.Endpoint) *u
 	form.Add("action", action)
 	form.Add("domain", ep.DNSName)
 	switch ep.RecordType {
-	case endpoint.RecordTypeA:
+	case endpoint.RecordTypeA, endpoint.RecordTypeAAAA:
 		form.Add("ip", ep.Targets[0])
 	case endpoint.RecordTypeCNAME:
 		form.Add("target", ep.Targets[0])

provider/pihole/client_test.go

@@ -113,12 +113,16 @@ func TestListRecords(t *testing.T) {
 			`))
 			return
 		}
+		// Pihole makes no distinction between A and AAAA records
 		w.Write([]byte(`
 		{
 			"data": [
 				["test1.example.com", "192.168.1.1"],
 				["test2.example.com", "192.168.1.2"],
-				["test3.match.com", "192.168.1.3"]
+				["test3.match.com", "192.168.1.3"],
+				["test1.example.com", "fc00::1:192:168:1:1"],
+				["test2.example.com", "fc00::1:192:168:1:2"],
+				["test3.match.com", "fc00::1:192:168:1:3"]
 			]
 		}
 		`))
@@ -157,6 +161,29 @@ func TestListRecords(t *testing.T) {
 		}
 	}
 
+	// Test retrieve AAAA records unfiltered
+	arecs, err = cl.listRecords(context.Background(), endpoint.RecordTypeAAAA)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(arecs) != 3 {
+		t.Fatal("Expected 3 AAAA records returned, got:", len(arecs))
+	}
+	// Ensure records were parsed correctly
+	expected = [][]string{
+		{"test1.example.com", "fc00::1:192:168:1:1"},
+		{"test2.example.com", "fc00::1:192:168:1:2"},
+		{"test3.match.com", "fc00::1:192:168:1:3"},
+	}
+	for idx, rec := range arecs {
+		if rec.DNSName != expected[idx][0] {
+			t.Error("Got invalid DNS Name:", rec.DNSName, "expected:", expected[idx][0])
+		}
+		if rec.Targets[0] != expected[idx][1] {
+			t.Error("Got invalid target:", rec.Targets[0], "expected:", expected[idx][1])
+		}
+	}
+
 	// Test retrieve CNAME records unfiltered
 	cnamerecs, err := cl.listRecords(context.Background(), endpoint.RecordTypeCNAME)
 	if err != nil {
@@ -209,6 +236,27 @@ func TestListRecords(t *testing.T) {
 		}
 	}
 
+	// Test retrieve AAAA records filtered
+	arecs, err = cl.listRecords(context.Background(), endpoint.RecordTypeAAAA)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(arecs) != 1 {
+		t.Fatal("Expected 1 AAAA record returned, got:", len(arecs))
+	}
+	// Ensure records were parsed correctly
+	expected = [][]string{
+		{"test3.match.com", "fc00::1:192:168:1:3"},
+	}
+	for idx, rec := range arecs {
+		if rec.DNSName != expected[idx][0] {
+			t.Error("Got invalid DNS Name:", rec.DNSName, "expected:", expected[idx][0])
+		}
+		if rec.Targets[0] != expected[idx][1] {
+			t.Error("Got invalid target:", rec.Targets[0], "expected:", expected[idx][1])
+		}
+	}
+
 	// Test retrieve CNAME records filtered
 	cnamerecs, err = cl.listRecords(context.Background(), endpoint.RecordTypeCNAME)
 	if err != nil {
@@ -246,6 +294,11 @@ func TestCreateRecord(t *testing.T) {
 			if r.Form.Get("ip") != ep.Targets[0] {
 				t.Error("Invalid ip in form:", r.Form.Get("ip"), "Expected:", ep.Targets[0])
 			}
+		// Pihole makes no distinction between A and AAAA records
+		case endpoint.RecordTypeAAAA:
+			if r.Form.Get("ip") != ep.Targets[0] {
+				t.Error("Invalid ip in form:", r.Form.Get("ip"), "Expected:", ep.Targets[0])
+			}
 		case endpoint.RecordTypeCNAME:
 			if r.Form.Get("target") != ep.Targets[0] {
 				t.Error("Invalid target in form:", r.Form.Get("target"), "Expected:", ep.Targets[0])
@@ -281,6 +334,16 @@ func TestCreateRecord(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// Test create AAAA record
+	ep = &endpoint.Endpoint{
+		DNSName:    "test.example.com",
+		Targets:    []string{"fc00::1:192:168:1:1"},
+		RecordType: endpoint.RecordTypeAAAA,
+	}
+	if err := cl.createRecord(context.Background(), ep); err != nil {
+		t.Fatal(err)
+	}
+
 	// Test create CNAME record
 	ep = &endpoint.Endpoint{
 		DNSName:    "test.example.com",
@@ -307,6 +370,11 @@ func TestDeleteRecord(t *testing.T) {
 			if r.Form.Get("ip") != ep.Targets[0] {
 				t.Error("Invalid ip in form:", r.Form.Get("ip"), "Expected:", ep.Targets[0])
 			}
+		// Pihole makes no distinction between A and AAAA records
+		case endpoint.RecordTypeAAAA:
+			if r.Form.Get("ip") != ep.Targets[0] {
+				t.Error("Invalid ip in form:", r.Form.Get("ip"), "Expected:", ep.Targets[0])
+			}
 		case endpoint.RecordTypeCNAME:
 			if r.Form.Get("target") != ep.Targets[0] {
 				t.Error("Invalid target in form:", r.Form.Get("target"), "Expected:", ep.Targets[0])
@@ -342,6 +410,16 @@ func TestDeleteRecord(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// Test delete AAAA record
+	ep = &endpoint.Endpoint{
+		DNSName:    "test.example.com",
+		Targets:    []string{"fc00::1:192:168:1:1"},
+		RecordType: endpoint.RecordTypeAAAA,
+	}
+	if err := cl.deleteRecord(context.Background(), ep); err != nil {
+		t.Fatal(err)
+	}
+
 	// Test delete CNAME record
 	ep = &endpoint.Endpoint{
 		DNSName:    "test.example.com",

provider/pihole/pihole.go

@@ -71,10 +71,15 @@ func (p *PiholeProvider) Records(ctx context.Context) ([]*endpoint.Endpoint, err
 	if err != nil {
 		return nil, err
 	}
+	aaaaRecords, err := p.api.listRecords(ctx, endpoint.RecordTypeAAAA)
+	if err != nil {
+		return nil, err
+	}
 	cnameRecords, err := p.api.listRecords(ctx, endpoint.RecordTypeCNAME)
 	if err != nil {
 		return nil, err
 	}
+	aRecords = append(aRecords, aaaaRecords...)
 	return append(aRecords, cnameRecords...), nil
 }