Refactor wireguard & add tun support

transport/wireguard/endpoint.go

@@ -0,0 +1,37 @@
+package wireguard
+
+import (
+	"net/netip"
+
+	M "github.com/sagernet/sing/common/metadata"
+
+	"golang.zx2c4.com/wireguard/conn"
+)
+
+var _ conn.Endpoint = (*Endpoint)(nil)
+
+type Endpoint M.Socksaddr
+
+func (e Endpoint) ClearSrc() {
+}
+
+func (e Endpoint) SrcToString() string {
+	return ""
+}
+
+func (e Endpoint) DstToString() string {
+	return (M.Socksaddr)(e).String()
+}
+
+func (e Endpoint) DstToBytes() []byte {
+	b, _ := (M.Socksaddr)(e).AddrPort().MarshalBinary()
+	return b
+}
+
+func (e Endpoint) DstIP() netip.Addr {
+	return (M.Socksaddr)(e).Addr
+}
+
+func (e Endpoint) SrcIP() netip.Addr {
+	return netip.Addr{}
+}