feat(action): add snake_case bind_address alias for serve

Co-Authored-By: Virgil <virgil@lethean.io>

action.go

@@ -25,18 +25,19 @@ var (
 )
 
 const (
-	actionArgBind            = "bind"
-	actionArgBindAddress     = "bindAddress"
-	actionArgIP              = "ip"
-	actionArgAddress         = "address"
-	actionArgName            = "name"
-	actionArgHost            = "host"
-	actionArgHostName        = "hostname"
-	actionArgPort            = "port"
-	actionArgDNSPort         = "dnsPort"
-	actionArgDNSPortSnake    = "dns_port"
-	actionArgHealthPort      = "health_port"
-	actionArgHealthPortCamel = "healthPort"
+	actionArgBind             = "bind"
+	actionArgBindAddress      = "bindAddress"
+	actionArgBindAddressSnake = "bind_address"
+	actionArgIP               = "ip"
+	actionArgAddress          = "address"
+	actionArgName             = "name"
+	actionArgHost             = "host"
+	actionArgHostName         = "hostname"
+	actionArgPort             = "port"
+	actionArgDNSPort          = "dnsPort"
+	actionArgDNSPortSnake     = "dns_port"
+	actionArgHealthPort       = "health_port"
+	actionArgHealthPortCamel  = "healthPort"
 )
 
 type ActionDefinition struct {
@@ -301,7 +302,7 @@ func (service *Service) handleReverseLookup(ctx context.Context, values map[stri
 
 func (service *Service) handleServe(ctx context.Context, values map[string]any) (any, bool, error) {
 	_ = ctx
-	bind, _, err := stringActionValueOptionalFromKeys(values, actionArgBind, actionArgBindAddress)
+	bind, _, err := stringActionValueOptionalFromKeys(values, actionArgBind, actionArgBindAddress, actionArgBindAddressSnake)
 	if err != nil {
 		return nil, false, err
 	}

service_test.go

@@ -2925,6 +2925,46 @@ func TestServiceHandleActionServeSnakeCaseAliases(t *testing.T) {
 	}
 }
 
+func TestServiceHandleActionServeSnakeCaseBindAddress(t *testing.T) {
+	dnsPort := pickFreeTCPPort(t)
+	service := NewService(ServiceOptions{
+		Records: map[string]NameRecords{
+			"gateway.charon.lthn": {
+				A: []string{"10.10.10.10"},
+			},
+		},
+	})
+
+	payload, ok, err := service.HandleAction(ActionServe, map[string]any{
+		"bind_address": "127.0.0.1",
+		"dns_port":     dnsPort,
+	})
+	if err != nil {
+		t.Fatalf("expected serve action to start with snake_case bind_address: %v", err)
+	}
+	if !ok {
+		t.Fatal("expected serve action to succeed with snake_case bind_address")
+	}
+
+	server, ok := payload.(*DNSServer)
+	if !ok {
+		t.Fatalf("expected DNSServer payload, got %T", payload)
+	}
+	if server == nil {
+		t.Fatal("expected dns server from serve action")
+	}
+
+	_, runtimeDNSPort, err := net.SplitHostPort(server.DNSAddress())
+	if err != nil {
+		t.Fatalf("expected dns address to include port: %v", err)
+	}
+	if runtimeDNSPort != strconv.Itoa(dnsPort) {
+		t.Fatalf("expected dns port %d, got %q", dnsPort, runtimeDNSPort)
+	}
+
+	_ = server.Close()
+}
+
 func TestServiceResolveServePortDefaultsToStandardDNSPort(t *testing.T) {
 	service := NewService(ServiceOptions{})
 	if service.ResolveDNSPort() != DefaultDNSPort {