chore: rebuild relay

common/net/bind.go

@@ -0,0 +1,36 @@
+package net
+
+import "net"
+
+type bindPacketConn struct {
+	net.PacketConn
+	rAddr net.Addr
+}
+
+func (wpc *bindPacketConn) Read(b []byte) (n int, err error) {
+	n, _, err = wpc.PacketConn.ReadFrom(b)
+	return n, err
+}
+
+func (wpc *bindPacketConn) Write(b []byte) (n int, err error) {
+	return wpc.PacketConn.WriteTo(b, wpc.rAddr)
+}
+
+func (wpc *bindPacketConn) RemoteAddr() net.Addr {
+	return wpc.rAddr
+}
+
+func (wpc *bindPacketConn) LocalAddr() net.Addr {
+	if wpc.PacketConn.LocalAddr() == nil {
+		return &net.UDPAddr{IP: net.IPv4zero, Port: 0}
+	} else {
+		return wpc.PacketConn.LocalAddr()
+	}
+}
+
+func NewBindPacketConn(pc net.PacketConn, rAddr net.Addr) net.Conn {
+	return &bindPacketConn{
+		PacketConn: pc,
+		rAddr:      rAddr,
+	}
+}