- Previously, without specifying the server IP, the remote address in the response to a UdpAssoicate command is `127.0.0.1`, which might break UDP for non-localhost clients.
- This commit changes it so that, localhost clients get responses with the corresponding loopback IP, non-localhost clients get responses with the corresponding `net.AnyIP` or `net.AnyIPv6`.
- The new behavior is also consistent with many other implementations. So the compatibility is guaranteed. It also makes specifying server IP optional.
- When you connect to a non-localhost socks5 server, in the response of a UdpAssociate from a socks5 server, the remote address may be `::` or `0.0.0.0`. The previous behavior is to connect to the remote address in the response, which obviously fails.
- This commit changes the behavior to dial to the outbound server's address when the remote address in the response is `::` or `0.0.0.0`.
- Rename `cmdUDPPort` to `cmdUDPAssociate` for clarity.
database64128