107 lines
4.2 KiB
C#
107 lines
4.2 KiB
C#
using System.Globalization;
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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 MoShiro.Protocol;
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namespace MoShiro.Measurement;
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/// <summary>
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/// 本机的公网地址：Agent 注册之后在 hello 里上报，面板用它自动填 <c>public_host</c> 和 <c>ipv6_host</c>，不需要管理员手填。
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/// 只列出「别人能拨进来」的地址：IPv4 要排除私网、CGNAT、回环、链路本地；IPv6 只要全球单播（2000::/3），
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/// 并且排除临时地址、tentative、deprecated 和文档/6to4/Teredo 段。读不到网卡信息时返回空，面板退回到管理员手填或观察到的来源地址。
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/// </summary>
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public static class LocalAddresses
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{
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public static IReadOnlyList<string> Sample()
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{
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var result = new List<string>();
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HashSet<string> unusable = OperatingSystem.IsLinux() ? UnusableIpv6(Read("/proc/net/if_inet6")) : [];
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try
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{
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foreach (NetworkInterface adapter in NetworkInterface.GetAllNetworkInterfaces())
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{
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if (adapter.OperationalStatus != OperationalStatus.Up || adapter.NetworkInterfaceType is NetworkInterfaceType.Loopback or NetworkInterfaceType.Tunnel)
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{
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continue;
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}
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foreach (UnicastIPAddressInformation unicast in adapter.GetIPProperties().UnicastAddresses)
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{
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IPAddress address = unicast.Address;
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bool usable = address.AddressFamily == AddressFamily.InterNetwork
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? PublicAddress.IsPublicIpv4(address)
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: PublicAddress.IsGlobalIpv6(address) && !unusable.Contains(address.ToString()) && !IsTemporary(unicast);
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if (usable && !result.Contains(address.ToString()))
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{
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result.Add(address.ToString());
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}
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}
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}
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}
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catch (Exception ex) when (ex is NetworkInformationException or PlatformNotSupportedException)
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{
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return [];
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}
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// 稳定顺序：同一台机器每次上报的顺序一样，面板不会因为顺序变化而改地址
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result.Sort(StringComparer.Ordinal);
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return result;
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}
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/// <summary>Linux 的 <c>/proc/net/if_inet6</c>：临时（0x01）、dadfailed（0x08）、deprecated（0x20）、tentative（0x40）的地址不能当作对外地址。</summary>
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public static HashSet<string> UnusableIpv6(string? procNetIfInet6)
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{
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var result = new HashSet<string>(StringComparer.Ordinal);
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if (procNetIfInet6 is null)
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{
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return result;
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}
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foreach (string line in procNetIfInet6.Split('\n'))
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{
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string[] fields = line.Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries);
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if (fields.Length != 6 || fields[0].Length != 32 || !uint.TryParse(fields[4], NumberStyles.HexNumber, CultureInfo.InvariantCulture, out uint flags) || (flags & 0x69) == 0)
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{
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continue;
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}
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var bytes = new byte[16];
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for (int i = 0; i < 16; i++)
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{
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bytes[i] = byte.Parse(fields[0].AsSpan(i * 2, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
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}
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result.Add(new IPAddress(bytes).ToString());
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}
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return result;
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}
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// Windows 和 macOS：随机后缀就是隐私（临时）地址
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private static bool IsTemporary(UnicastIPAddressInformation unicast)
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{
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try
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{
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return OperatingSystem.IsWindows()
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&& (unicast.SuffixOrigin == SuffixOrigin.Random || unicast.DuplicateAddressDetectionState is DuplicateAddressDetectionState.Tentative or DuplicateAddressDetectionState.Duplicate);
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}
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catch (PlatformNotSupportedException)
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{
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return false;
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}
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}
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private static string? Read(string path)
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{
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try
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{
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return File.Exists(path) ? File.ReadAllText(path) : null;
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}
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catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
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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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