203 lines
9.1 KiB
C#
203 lines
9.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Net;
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using System.Net.NetworkInformation;
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using System.Net.Sockets;
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using System.Threading;
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using UnityEngine;
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using XWorld.Framework.Protocol;
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namespace XGame.MiniGame
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{
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public sealed class DevServerDiscovery
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{
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private readonly string _token;
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private readonly string _extraProbeIp;
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private readonly object _lock = new object();
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private readonly List<DevDiscoveryReply> _results = new List<DevDiscoveryReply>();
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private Thread _thread;
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private volatile bool _running;
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public DevServerDiscovery(string token)
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{
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_token = token;
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// 跨网段联调：广播/定向广播不被路由器转发(RFC 2644)，组播亦实测不通(路由器未开组播路由)，
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// 唯一可靠路径是向已知开发机 IP 单播。IP 来自 persistentDataPath/dev_server.txt——底包首启弹框
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// 录入(见 Base 层 DevServerConfig/DevServerPrompt)。persistentDataPath 不能在后台线程访问，
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// 故在主线程构造时读好存字段，Run(后台线程)只用字段。
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_extraProbeIp = ReadConfiguredProbeIp();
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}
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public bool IsRunning => _running;
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public void Begin(int durationMs = 1200)
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{
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if (_running) return;
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_running = true;
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_thread = new Thread(() => Run(durationMs)) { IsBackground = true };
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_thread.Start();
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}
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private void Run(int durationMs)
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{
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UdpClient udp = null;
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try
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{
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udp = new UdpClient(AddressFamily.InterNetwork);
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udp.EnableBroadcast = true;
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udp.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
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udp.Client.Bind(new IPEndPoint(IPAddress.Any, 0));
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udp.Client.ReceiveTimeout = 250;
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uint nonce = unchecked((uint)Guid.NewGuid().GetHashCode());
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byte[] query = DevDiscoveryCodec.EncodeQuery(new DevDiscoveryQuery
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{
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ProtoVersion = DevDiscovery.ProtoVersion,
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Nonce = nonce,
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Token = _token,
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});
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// 同机的 UDP 广播常收不到（取决于网卡是否回环广播），故同时向 127.0.0.1 单播；
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// 并在窗口内周期重发，防响应器（网关）刚起来还没监听。
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// 255.255.255.255（限制广播）在部分 Android WiFi 驱动上会被丢弃，故再按各网卡 IP|~mask 补发子网定向广播（如 192.168.1.255）。
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List<IPEndPoint> targetList = new List<IPEndPoint>
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{
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new IPEndPoint(IPAddress.Broadcast, DevDiscovery.Port),
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new IPEndPoint(IPAddress.Loopback, DevDiscovery.Port),
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};
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foreach (IPAddress bc in GetDirectedBroadcasts())
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targetList.Add(new IPEndPoint(bc, DevDiscovery.Port));
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if (!string.IsNullOrEmpty(_extraProbeIp) && IPAddress.TryParse(_extraProbeIp, out IPAddress extra))
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targetList.Add(new IPEndPoint(extra, DevDiscovery.Port));
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IPEndPoint[] targets = targetList.ToArray();
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Debug.Log("[DevTest] targets(" + targets.Length + "): " + string.Join(", ", Array.ConvertAll(targets, t => t.ToString())));
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DateTime deadline = DateTime.UtcNow.AddMilliseconds(durationMs);
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DateTime nextSend = DateTime.MinValue;
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while (_running && DateTime.UtcNow < deadline)
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{
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if (DateTime.UtcNow >= nextSend)
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{
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foreach (IPEndPoint t in targets)
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{
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try { udp.Send(query, query.Length, t); } catch { }
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}
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nextSend = DateTime.UtcNow.AddMilliseconds(300);
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}
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IPEndPoint from = new IPEndPoint(IPAddress.Any, 0);
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byte[] data;
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try { data = udp.Receive(ref from); }
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catch (SocketException) { continue; }
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if (!DevDiscoveryCodec.TryDecodeReply(data, out var reply)) continue;
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if (reply.ProtoVersion != DevDiscovery.ProtoVersion) continue;
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if (reply.Nonce != nonce) continue;
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if (reply.Token != _token) continue;
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lock (_lock)
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{
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if (!_results.Exists(r => r.GatewayUrl == reply.GatewayUrl))
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{
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_results.Add(reply);
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}
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}
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}
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}
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catch (Exception e)
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{
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Debug.LogWarning("[DevTest] discovery thread error: " + e.Message);
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}
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finally
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{
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try { udp?.Close(); } catch { }
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_running = false;
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}
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}
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// 枚举本机所有 Up 状态 IPv4 网卡，按 broadcast = ip | ~mask 算出各自的子网定向广播地址。
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// 关键：Android/Mono 下 IPv4Mask 常拿不到（返回 null/0.0.0.0 甚至抛异常），故对私有网段按 /24 兜底，
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// 且逐地址 try/catch，任何一块网卡取掩码失败都不中断整体枚举。
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private static List<IPAddress> GetDirectedBroadcasts()
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{
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List<IPAddress> list = new List<IPAddress>();
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NetworkInterface[] nics;
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try { nics = NetworkInterface.GetAllNetworkInterfaces(); }
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catch (Exception e) { Debug.LogWarning("[DevTest] GetAllNetworkInterfaces failed: " + e.Message); return list; }
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foreach (NetworkInterface ni in nics)
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{
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if (ni.OperationalStatus != OperationalStatus.Up) continue;
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if (ni.NetworkInterfaceType == NetworkInterfaceType.Loopback) continue;
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IPInterfaceProperties props;
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try { props = ni.GetIPProperties(); }
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catch { continue; }
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foreach (UnicastIPAddressInformation ua in props.UnicastAddresses)
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{
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if (ua.Address.AddressFamily != AddressFamily.InterNetwork) continue; // 只处理 IPv4
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byte[] ip = ua.Address.GetAddressBytes();
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if (ip.Length != 4) continue;
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byte[] mk = null;
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try { IPAddress m = ua.IPv4Mask; if (m != null) mk = m.GetAddressBytes(); }
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catch { mk = null; } // Android 上访问 IPv4Mask 可能抛，兜住
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// 掩码不可用（null/长度不对/全 0）时，私有网段按 /24 兜底（最常见的家用/办公 WiFi），公网地址不猜。
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bool maskBad = mk == null || mk.Length != 4 || (mk[0] == 0 && mk[1] == 0 && mk[2] == 0 && mk[3] == 0);
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if (maskBad)
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{
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if (!IsPrivateV4(ip)) continue;
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mk = new byte[] { 255, 255, 255, 0 };
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}
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byte[] bc = new byte[4];
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for (int i = 0; i < 4; i++) bc[i] = (byte)(ip[i] | (~mk[i] & 0xFF));
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IPAddress bcAddr = new IPAddress(bc);
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list.Add(bcAddr);
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Debug.Log("[DevTest] nic=" + ni.Name + " ip=" + ua.Address + " mask=" + string.Join(".", mk) + " bc=" + bcAddr);
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}
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}
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return list;
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}
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private static bool IsPrivateV4(byte[] ip)
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{
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if (ip[0] == 10) return true; // 10.0.0.0/8
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if (ip[0] == 192 && ip[1] == 168) return true; // 192.168.0.0/16
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if (ip[0] == 172 && ip[1] >= 16 && ip[1] <= 31) return true; // 172.16.0.0/12
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return false;
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}
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public List<DevDiscoveryReply> TakeResults()
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{
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lock (_lock)
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{
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return new List<DevDiscoveryReply>(_results);
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}
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}
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public void Stop()
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{
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_running = false;
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}
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// 读 dev_server.txt 首行并校验为 IPv4，失败一律 null。与 Base 层 DevServerConfig.Load() 语义一致——
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// XWorld.Link 未引用 Base 程序集，按本项目“内联+两边同步”惯例复制最小实现，改格式时两边须同步。
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private static string ReadConfiguredProbeIp()
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{
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try
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{
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string path = System.IO.Path.Combine(Application.persistentDataPath, "dev_server.txt");
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if (!System.IO.File.Exists(path)) return null;
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string line = System.IO.File.ReadAllText(path).Trim();
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if (line.Length == 0) return null;
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if (!IPAddress.TryParse(line, out IPAddress ip)) return null;
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if (ip.AddressFamily != AddressFamily.InterNetwork) return null; // 只认 IPv4
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return ip.ToString();
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}
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catch (Exception)
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{
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return null;
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}
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}
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}
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}
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