56 lines
2.2 KiB
C#
56 lines
2.2 KiB
C#
using System.Linq;
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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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namespace XWorld.Server.Gateway
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{
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// 取本机内网主 IPv4，用于广播 advertise（仿 C++ XBroadcastServer.GetLocalIPAddress）。
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// 优先选 Up、非 loopback、非隧道、带网关的网卡上的 IPv4；都没有则回退 127.0.0.1。
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public static class LanIp
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{
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public static string Resolve()
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{
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// 1) 优先：有默认网关的活动网卡（最可能是真实内网口）
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string withGateway = PickFromNics(requireGateway: true);
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if (withGateway != null) return withGateway;
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// 2) 退一步：任意 Up 的非 loopback/隧道网卡上的私有 IPv4
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string anyUp = PickFromNics(requireGateway: false);
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if (anyUp != null) return anyUp;
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// 3) 兜底：DNS 解析本机名里的第一个 IPv4
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foreach (IPAddress addr in Dns.GetHostAddresses(Dns.GetHostName()))
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{
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if (addr.AddressFamily == AddressFamily.InterNetwork && !IPAddress.IsLoopback(addr))
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return addr.ToString();
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}
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return "127.0.0.1";
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}
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private static string PickFromNics(bool requireGateway)
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{
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foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
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{
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if (nic.OperationalStatus != OperationalStatus.Up) continue;
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if (nic.NetworkInterfaceType == NetworkInterfaceType.Loopback) continue;
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if (nic.NetworkInterfaceType == NetworkInterfaceType.Tunnel) continue;
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IPInterfaceProperties props = nic.GetIPProperties();
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if (requireGateway && !props.GatewayAddresses.Any(g => g.Address.AddressFamily == AddressFamily.InterNetwork))
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continue;
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foreach (UnicastIPAddressInformation ua in props.UnicastAddresses)
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{
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IPAddress ip = ua.Address;
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if (ip.AddressFamily != AddressFamily.InterNetwork) continue;
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if (IPAddress.IsLoopback(ip)) continue;
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return ip.ToString();
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}
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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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