Add DERP service

option/tailscale.go

@@ -2,6 +2,12 @@ package option
 
 import (
 	"net/netip"
+	"net/url"
+	"reflect"
+
+	"github.com/sagernet/sing/common/json"
+	"github.com/sagernet/sing/common/json/badoption"
+	M "github.com/sagernet/sing/common/metadata"
 )
 
 type TailscaleEndpointOptions struct {
@@ -23,3 +29,87 @@ type TailscaleDNSServerOptions struct {
 	Endpoint               string `json:"endpoint,omitempty"`
 	AcceptDefaultResolvers bool   `json:"accept_default_resolvers,omitempty"`
 }
+
+type DERPServiceOptions struct {
+	ListenOptions
+	InboundTLSOptionsContainer
+	ConfigPath           string                                          `json:"config_path,omitempty"`
+	VerifyClientEndpoint badoption.Listable[string]                      `json:"verify_client_endpoint,omitempty"`
+	VerifyClientURL      badoption.Listable[*DERPVerifyClientURLOptions] `json:"verify_client_url,omitempty"`
+	MeshWith             badoption.Listable[*DERPMeshOptions]            `json:"mesh_with,omitempty"`
+	MeshPSK              string                                          `json:"mesh_psk,omitempty"`
+	MeshPSKFile          string                                          `json:"mesh_psk_file,omitempty"`
+	STUN                 *DERPSTUNListenOptions                          `json:"stun,omitempty"`
+}
+
+type _DERPVerifyClientURLOptions struct {
+	URL string `json:"url,omitempty"`
+	DialerOptions
+}
+
+type DERPVerifyClientURLOptions _DERPVerifyClientURLOptions
+
+func (d DERPVerifyClientURLOptions) ServerIsDomain() bool {
+	verifyURL, err := url.Parse(d.URL)
+	if err != nil {
+		return false
+	}
+	return M.IsDomainName(verifyURL.Host)
+}
+
+func (d DERPVerifyClientURLOptions) MarshalJSON() ([]byte, error) {
+	if reflect.DeepEqual(d, _DERPVerifyClientURLOptions{}) {
+		return json.Marshal(d.URL)
+	} else {
+		return json.Marshal(_DERPVerifyClientURLOptions(d))
+	}
+}
+
+func (d *DERPVerifyClientURLOptions) UnmarshalJSON(bytes []byte) error {
+	var stringValue string
+	err := json.Unmarshal(bytes, &stringValue)
+	if err == nil {
+		d.URL = stringValue
+		return nil
+	}
+	return json.Unmarshal(bytes, (*_DERPVerifyClientURLOptions)(d))
+}
+
+type DERPMeshOptions struct {
+	ServerOptions
+	Host string `json:"host,omitempty"`
+	OutboundTLSOptionsContainer
+	DialerOptions
+}
+
+type _DERPSTUNListenOptions struct {
+	Enabled bool
+	ListenOptions
+}
+
+type DERPSTUNListenOptions _DERPSTUNListenOptions
+
+func (d DERPSTUNListenOptions) MarshalJSON() ([]byte, error) {
+	portOptions := _DERPSTUNListenOptions{
+		Enabled: d.Enabled,
+		ListenOptions: ListenOptions{
+			ListenPort: d.ListenPort,
+		},
+	}
+	if _DERPSTUNListenOptions(d) == portOptions {
+		return json.Marshal(d.Enabled)
+	} else {
+		return json.Marshal(_DERPSTUNListenOptions(d))
+	}
+}
+
+func (d *DERPSTUNListenOptions) UnmarshalJSON(bytes []byte) error {
+	var portValue uint16
+	err := json.Unmarshal(bytes, &portValue)
+	if err == nil {
+		d.Enabled = true
+		d.ListenPort = portValue
+		return nil
+	}
+	return json.Unmarshal(bytes, (*_DERPSTUNListenOptions)(d))
+}