fix: vless packetaddr not working

transport/vless/packet.go

@@ -0,0 +1,57 @@
+package vless
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+
+	"github.com/metacubex/mihomo/common/pool"
+)
+
+type PacketConn struct {
+	net.Conn
+	rAddr net.Addr
+}
+
+func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	err := binary.Write(c.Conn, binary.BigEndian, uint16(len(b)))
+	if err != nil {
+		return 0, err
+	}
+
+	return c.Conn.Write(b)
+}
+
+func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	var length uint16
+	err := binary.Read(c.Conn, binary.BigEndian, &length)
+	if err != nil {
+		return 0, nil, err
+	}
+	if len(b) < int(length) {
+		return 0, nil, io.ErrShortBuffer
+	}
+	n, err := io.ReadFull(c.Conn, b[:length])
+	return n, c.rAddr, err
+}
+
+func (c *PacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) {
+	var length uint16
+	err = binary.Read(c.Conn, binary.BigEndian, &length)
+	if err != nil {
+		return
+	}
+	readBuf := pool.Get(int(length))
+	put = func() {
+		_ = pool.Put(readBuf)
+	}
+	n, err := io.ReadFull(c.Conn, readBuf)
+	if err != nil {
+		put()
+		put = nil
+		return
+	}
+	data = readBuf[:n]
+	addr = c.rAddr
+	return
+}

transport/vless/vless.go

@@ -51,6 +51,10 @@ func (c *Client) StreamConn(conn net.Conn, dst *DstAddr) (net.Conn, error) {
 	return newConn(conn, c, dst)
 }
 
+func (c *Client) PacketConn(conn net.Conn, rAddr net.Addr) net.PacketConn {
+	return &PacketConn{conn, rAddr}
+}
+
 // NewClient return Client instance
 func NewClient(uuidStr string, addons *Addons) (*Client, error) {
 	uid, err := utils.UUIDMap(uuidStr)