Understanding UDP return path port selection

[arisudesu]

Am I missing something, or the datagrams received from the SOCKS server are incorrectly matched with the first application that has the destination included in the received datagram (the conn->orig_dest_ip == src_ip && conn->orig_dest_port == src_port condition)?

If there is for example, two apps that simultaneously send the datagrams to 1.1.1.1:53, they both will be relayed, but the response datagrams would be matched only against the first and never the second app. This is because SOCKS sever sends datagrams back to ProxyBridge using a single inbound port (the local port the socks5_udp_send_socket is bound to) and there is not enough information to distinguish the original sender app? Perhaps, for each src port, from which the relay port accepts a datagram, there should be separate socks5_udp_send_sockets having different ports, then on the return path, the original sender app could easily be distinguished by it?