macOS 上端口占用判断不准确

[AnemoFlower]

在 macOS 环境下，即使端口转发的本地端口已被占用，Terracotta 依然会尝试使用这个端口。
相关代码和日志片段：

Terracotta/src/ports.rs

Lines 12 to 17 in 22bdce0

	impl PortRequest {
	pub fn request_specific(port: u16) -> io::Result<u16> {
	TcpListener::bind((Ipv4Addr::LOCALHOST, port))
	.and_then(|socket| socket.local_addr())
	.map(|address| address.port())
	}

Terracotta/src/controller/rooms/experimental/room.rs

Lines 373 to 378 in 22bdce0

	// To maximum compatibility, try to request the identical port.
	// If failed, use a dynamic free port instead.
	let local_port = PortRequest::request_specific(port).unwrap_or_else(|e| {
	logging!("RoomExperiment", "Unable to request shadow port {} on client: {:?}. Mods requiring UDP socket like SimpleVoiceChat may go wrong.", port, e);
	PortRequest::Minecraft.request()
	});

[RoomExperiment]: Scaffolding Server has been verified.
[RoomExperiment]: MC server is at 25565
[EasyTier CLI]: Port forward rule add: udp 0.0.0.0:25565
[EasyTier CLI]: Port forward rule add: tcp [::]:25565
[EasyTier CLI]: Error: Rust error: Failed to reload port forwards
[EasyTier CLI]: 
[EasyTier CLI]: Caused by:
[EasyTier CLI]:     0: tunnel error io error
[EasyTier CLI]:     1: io error
[EasyTier CLI]:     2: Address already in use (os error 48)
[EasyTier CLI]: 
[EasyTier CLI]: Caused by:
[EasyTier CLI]:     Failed to reload port forwards
[EasyTier CLI]:     
[EasyTier CLI]:     Caused by:
[EasyTier CLI]:         0: tunnel error io error
[EasyTier CLI]:         1: io error
[EasyTier CLI]:         2: Address already in use (os error 48)
[EasyTier CLI]: Cannot adding port-forward rules: 0.0.0.0:25565 -> 10.126.126.1:25565 (tcp), [::]:25565 -> 10.126.126.1:25565 (udp)
[RoomExperiment]: Cannot create a port-forward 25565 -> 25565 for MC Connection.

最小可复现示例

use std::io;
use std::net::{Ipv4Addr, TcpListener};

fn request_specific(port: u16) -> io::Result<u16> {
    TcpListener::bind((Ipv4Addr::LOCALHOST, port))
        .and_then(|socket| socket.local_addr())
        .map(|address| address.port())
}

fn main() {
    let port = 25565;

    match request_specific(port) {
        Ok(port) => println!("绑定成功：{}", port),
        Err(e) => println!("绑定失败：{}", e),
    }
}

[burningtnt]

调查了一番，我认为是 JDK 在 MacOS 上权限的问题。理论上 JDK 应该是有 localNetwork 的权限的，不知道为什么没有了……

难以解决，但还是先挂在这里吧