Improve OpenVPN & OpenConnect interoperability

include/openconnect.go

@@ -4,9 +4,14 @@ package include
 
 import (
 	"github.com/sagernet/sing-box/adapter/endpoint"
+	"github.com/sagernet/sing-box/dns"
 	"github.com/sagernet/sing-box/protocol/openconnect"
 )
 
 func registerOpenConnectEndpoint(registry *endpoint.Registry) {
 	openconnect.RegisterEndpoint(registry)
 }
+
+func registerOpenConnectDNSTransport(registry *dns.TransportRegistry) {
+	openconnect.RegisterDNSTransport(registry)
+}

include/openconnect_stub.go

@@ -8,6 +8,7 @@ import (
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/adapter/endpoint"
 	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
 	E "github.com/sagernet/sing/common/exceptions"
@@ -21,3 +22,9 @@ func registerOpenConnectEndpoint(registry *endpoint.Registry) {
 		return nil, E.New(`OpenConnect is not included in this build, rebuild with -tags with_openconnect`)
 	})
 }
+
+func registerOpenConnectDNSTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.OpenConnectDNSServerOptions](registry, C.DNSTypeOpenConnect, func(ctx context.Context, logger log.ContextLogger, tag string, options option.OpenConnectDNSServerOptions) (adapter.DNSTransport, error) {
+		return nil, E.New(`OpenConnect is not included in this build, rebuild with -tags with_openconnect`)
+	})
+}

include/openvpn.go

@@ -4,9 +4,14 @@ package include
 
 import (
 	"github.com/sagernet/sing-box/adapter/endpoint"
+	"github.com/sagernet/sing-box/dns"
 	"github.com/sagernet/sing-box/protocol/openvpn"
 )
 
 func registerOpenVPNEndpoints(registry *endpoint.Registry) {
 	openvpn.RegisterEndpoint(registry)
 }
+
+func registerOpenVPNDNSTransport(registry *dns.TransportRegistry) {
+	openvpn.RegisterDNSTransport(registry)
+}

include/openvpn_stub.go

@@ -8,6 +8,7 @@ import (
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/adapter/endpoint"
 	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
 	E "github.com/sagernet/sing/common/exceptions"
@@ -27,3 +28,9 @@ func registerOpenVPNEndpoints(registry *endpoint.Registry) {
 		return nil, E.New(`OpenVPN is not included in this build, rebuild with -tags with_openvpn`)
 	})
 }
+
+func registerOpenVPNDNSTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.OpenVPNDNSServerOptions](registry, C.DNSTypeOpenVPN, func(ctx context.Context, logger log.ContextLogger, tag string, options option.OpenVPNDNSServerOptions) (adapter.DNSTransport, error) {
+		return nil, E.New(`OpenVPN is not included in this build, rebuild with -tags with_openvpn`)
+	})
+}

include/registry.go

@@ -134,6 +134,8 @@ func DNSTransportRegistry() *dns.TransportRegistry {
 	registerQUICTransports(registry)
 	registerDHCPTransport(registry)
 	registerTailscaleTransport(registry)
+	registerOpenConnectDNSTransport(registry)
+	registerOpenVPNDNSTransport(registry)
 
 	return registry
 }