Add client and service

v2_client.go

@@ -0,0 +1,37 @@
+package shadowtls
+
+import (
+	"github.com/sagernet/sing/common/buf"
+	"github.com/sagernet/sing/common/bufio"
+)
+
+type clientConn struct {
+	*shadowConn
+	hashConn *hashReadConn
+}
+
+func newClientConn(hashConn *hashReadConn) *clientConn {
+	return &clientConn{newConn(hashConn.Conn), hashConn}
+}
+
+func (c *clientConn) Write(p []byte) (n int, err error) {
+	if c.hashConn != nil {
+		sum := c.hashConn.Sum()
+		c.hashConn = nil
+		_, err = bufio.WriteVectorised(c.shadowConn, [][]byte{sum, p})
+		if err == nil {
+			n = len(p)
+		}
+		return
+	}
+	return c.shadowConn.Write(p)
+}
+
+func (c *clientConn) WriteVectorised(buffers []*buf.Buffer) error {
+	if c.hashConn != nil {
+		sum := c.hashConn.Sum()
+		c.hashConn = nil
+		return c.shadowConn.WriteVectorised(append([]*buf.Buffer{buf.As(sum)}, buffers...))
+	}
+	return c.shadowConn.WriteVectorised(buffers)
+}