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精确判断主DNS

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This commit is contained in:
老九 2021-08-27 21:35:00 +08:00
parent 8e8ad9f69e
commit 2324634a86
2 changed files with 24 additions and 20 deletions
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4
FastGithub.Dns/DnsOverUdpHostedService.cs
View File

@ -57,7 +57,7 @@ namespace FastGithub.Dns
{
try
{
SystemDnsUtil.SetPrimitiveDns(IPAddress.Loopback);
SystemDnsUtil.SetAsPrimitiveDns();
SystemDnsUtil.FlushResolverCache();
}
catch (Exception ex)
@ -100,7 +100,7 @@ namespace FastGithub.Dns
try
{
SystemDnsUtil.RemovePrimitiveDns(IPAddress.Loopback);
SystemDnsUtil.RemoveFromPrimitiveDns();
}
catch (Exception ex)
{

40
FastGithub.Dns/SystemDnsUtil.cs
View File

@ -15,11 +15,6 @@ namespace FastGithub.Dns
/// </summary>
static class SystemDnsUtil
{
/// <summary>
/// www.baidu.com的ip
/// </summary>
private static readonly IPAddress www_baidu_com = IPAddress.Parse("183.232.231.172");
/// <summary>
/// 刷新DNS缓存
/// </summary>
@ -39,21 +34,22 @@ namespace FastGithub.Dns
}
/// <summary>
/// 设置主dns
/// </summary>
/// <param name="primitive"></param>
/// 设置为主dns
/// </summary>
/// <exception cref="FastGithubException"></exception>
public static void SetPrimitiveDns(IPAddress primitive)
public static void SetAsPrimitiveDns()
{
var @interface = GetOutboundNetworkInterface();
if (@interface == null)
{
throw new FastGithubException($"找不到匹配的网络适配器来设置主DNS值：{primitive}");
throw new FastGithubException($"找不到匹配的网络适配器来设置主DNS");
}
var dnsAddresses = @interface.GetIPProperties().DnsAddresses;
if (primitive.Equals(dnsAddresses.FirstOrDefault()) == false)
var firstRecord = dnsAddresses.FirstOrDefault();
if (firstRecord == null || LocalMachine.ContainsIPAddress(firstRecord) == false)
{
var primitive = IPAddress.Loopback;
var nameServers = dnsAddresses.Prepend(primitive);
if (OperatingSystem.IsWindows())
{
@ -71,26 +67,34 @@ namespace FastGithub.Dns
}
/// <summary>
/// 移除主dns
/// </summary>
/// <param name="primitive"></param>
/// 从主dns移除
/// </summary>
/// <exception cref="FastGithubException"></exception>
public static void RemovePrimitiveDns(IPAddress primitive)
public static void RemoveFromPrimitiveDns()
{
var @interface = GetOutboundNetworkInterface();
if (@interface == null)
{
throw new FastGithubException($"找不到匹配的网络适配器来移除主DNS值：{primitive}");
throw new FastGithubException($"找不到匹配的网络适配器来移除主DNS");
}
var dnsAddresses = @interface.GetIPProperties().DnsAddresses;
if (primitive.Equals(dnsAddresses.FirstOrDefault()))
var firstRecord = dnsAddresses.FirstOrDefault();
if (firstRecord != null && LocalMachine.ContainsIPAddress(firstRecord))
{
var nameServers = dnsAddresses.Skip(1);
if (OperatingSystem.IsWindows())
{
SetNameServers(@interface, nameServers);
}
else if (OperatingSystem.IsLinux())
{
throw new FastGithubException($"不支持自动移除本机主DNS，请手工移除/etc/resolv.conf的第一条记录");
}
else if (OperatingSystem.IsMacOS())
{
throw new FastGithubException($"不支持自动移除本机主DNS，请手工移除连接网络的DNS的第一条记录");
}
}
}
@ -101,7 +105,7 @@ namespace FastGithub.Dns
/// <returns></returns>
private static NetworkInterface? GetOutboundNetworkInterface()
{
var remoteEndPoint = new IPEndPoint(www_baidu_com, 443);
var remoteEndPoint = new IPEndPoint(IPAddress.Parse("1.1.1.1"), 53);
var address = LocalMachine.GetLocalIPAddress(remoteEndPoint);
if (address == null)
{