119 lines
4.2 KiB
C#
119 lines
4.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Net;
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using System.Net.NetworkInformation;
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using System.Runtime.InteropServices;
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using System.Runtime.Versioning;
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namespace FastGithub.Dns
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{
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/// <summary>
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/// 系统域名服务工具
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/// </summary>
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[SupportedOSPlatform("windows")]
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static class SystemDnsUtil
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{
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/// <summary>
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/// www.baidu.com的ip
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/// </summary>
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private static readonly IPAddress www_baidu_com = IPAddress.Parse("183.232.231.172");
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[DllImport("iphlpapi")]
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private static extern int GetBestInterface(uint dwDestAddr, ref uint pdwBestIfIndex);
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/// <summary>
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/// 刷新DNS缓存
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/// </summary>
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[DllImport("dnsapi.dll", EntryPoint = "DnsFlushResolverCache", SetLastError = true)]
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public static extern void DnsFlushResolverCache();
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/// <summary>
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/// 通过远程地址查找匹配的网络适接口
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/// </summary>
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/// <param name="remoteAddress"></param>
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/// <returns></returns>
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private static NetworkInterface GetBestNetworkInterface(IPAddress remoteAddress)
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{
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var dwBestIfIndex = 0u;
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var dwDestAddr = BitConverter.ToUInt32(remoteAddress.GetAddressBytes());
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var errorCode = GetBestInterface(dwDestAddr, ref dwBestIfIndex);
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if (errorCode != 0)
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{
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throw new NetworkInformationException(errorCode);
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}
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var @interface = NetworkInterface
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.GetAllNetworkInterfaces()
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.Where(item => item.GetIPProperties().GetIPv4Properties().Index == dwBestIfIndex)
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.FirstOrDefault();
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return @interface ?? throw new NotSupportedException("找不到网络适配器用来设置dns");
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}
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/// <summary>
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/// 设置主dns
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/// </summary>
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/// <param name="primitive"></param>
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/// <exception cref="NetworkInformationException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public static void DnsSetPrimitive(IPAddress primitive)
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{
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var @interface = GetBestNetworkInterface(www_baidu_com);
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var dnsAddresses = @interface.GetIPProperties().DnsAddresses;
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if (primitive.Equals(dnsAddresses.FirstOrDefault()) == false)
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{
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var nameServers = dnsAddresses.Prepend(primitive);
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SetNameServers(@interface, nameServers);
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}
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}
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/// <summary>
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/// 移除主dns
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/// </summary>
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/// <param name="primitive"></param>
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/// <exception cref="NetworkInformationException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public static void DnsRemovePrimitive(IPAddress primitive)
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{
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var @interface = GetBestNetworkInterface(www_baidu_com);
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var dnsAddresses = @interface.GetIPProperties().DnsAddresses;
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if (primitive.Equals(dnsAddresses.FirstOrDefault()))
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{
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var nameServers = dnsAddresses.Skip(1);
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SetNameServers(@interface, nameServers);
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}
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}
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/// <summary>
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/// 设置网口的dns
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/// </summary>
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/// <param name="interface"></param>
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/// <param name="nameServers"></param>
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private static void SetNameServers(NetworkInterface @interface, IEnumerable<IPAddress> nameServers)
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{
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Netsh($@"interface ipv4 delete dns ""{@interface.Name}"" all");
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foreach (var address in nameServers)
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{
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Netsh($@"interface ipv4 add dns ""{@interface.Name}"" {address} validate=no");
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}
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static void Netsh(string arguments)
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{
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var netsh = new ProcessStartInfo
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{
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FileName = "netsh.exe",
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Arguments = arguments,
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CreateNoWindow = true,
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UseShellExecute = false,
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WindowStyle = ProcessWindowStyle.Hidden
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};
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Process.Start(netsh)?.WaitForExit();
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}
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}
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}
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}
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