Add shadowtls tls config

common/tls/config.go

@@ -12,6 +12,7 @@ import (
 type (
 	STDConfig       = tls.Config
 	STDConn         = tls.Conn
+	ConnectionState = tls.ConnectionState
 )
 
 type Config interface {
@@ -33,7 +34,7 @@ type ServerConfig interface {
 type Conn interface {
 	net.Conn
 	HandshakeContext(ctx context.Context) error
-	ConnectionState() tls.ConnectionState
+	ConnectionState() ConnectionState
 }
 
 func ParseTLSVersion(version string) (uint16, error) {

transport/shadowtls/config_119.go

@@ -0,0 +1,16 @@
+//go:build !go1.20
+
+package shadowtls
+
+import sTLS "github.com/sagernet/sing-box/transport/shadowtls/tls_go119"
+
+type (
+	sTLSConfig          = sTLS.Config
+	sTLSConnectionState = sTLS.ConnectionState
+	sTLSConn            = sTLS.Conn
+)
+
+var (
+	sTLSCipherSuites = sTLS.CipherSuites
+	sTLSClient       = sTLS.Client
+)

transport/shadowtls/config_120.go

@@ -0,0 +1,16 @@
+//go:build go1.20
+
+package shadowtls
+
+import sTLS "github.com/sagernet/sing-box/transport/shadowtls/tls"
+
+type (
+	sTLSConfig          = sTLS.Config
+	sTLSConnectionState = sTLS.ConnectionState
+	sTLSConn            = sTLS.Conn
+)
+
+var (
+	sTLSCipherSuites = sTLS.CipherSuites
+	sTLSClient       = sTLS.Client
+)