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

40
FastGithub.Dns/SystemDnsUtil.cs
View File

@ -15,11 +15,6 @@ namespace FastGithub.Dns
/// </summary> /// </summary>
static class SystemDnsUtil static class SystemDnsUtil
{ {
/// <summary>
/// www.baidu.com的ip
/// </summary>
private static readonly IPAddress www_baidu_com = IPAddress.Parse("183.232.231.172");
/// <summary> /// <summary>
/// 刷新DNS缓存 /// 刷新DNS缓存
/// </summary> /// </summary>
@ -39,21 +34,22 @@ namespace FastGithub.Dns
} }
/// <summary> /// <summary>
/// 设置主dns /// 设置为主dns
/// </summary> /// </summary>
/// <param name="primitive"></param>
/// <exception cref="FastGithubException"></exception> /// <exception cref="FastGithubException"></exception>
public static void SetPrimitiveDns(IPAddress primitive) public static void SetAsPrimitiveDns()
{ {
var @interface = GetOutboundNetworkInterface(); var @interface = GetOutboundNetworkInterface();
if (@interface == null) 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; 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); var nameServers = dnsAddresses.Prepend(primitive);
if (OperatingSystem.IsWindows()) if (OperatingSystem.IsWindows())
{ {
@ -71,26 +67,34 @@ namespace FastGithub.Dns
} }
/// <summary> /// <summary>
/// 移除主dns /// 从主dns移除
/// </summary> /// </summary>
/// <param name="primitive"></param>
/// <exception cref="FastGithubException"></exception> /// <exception cref="FastGithubException"></exception>
public static void RemovePrimitiveDns(IPAddress primitive) public static void RemoveFromPrimitiveDns()
{ {
var @interface = GetOutboundNetworkInterface(); var @interface = GetOutboundNetworkInterface();
if (@interface == null) 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; 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); var nameServers = dnsAddresses.Skip(1);
if (OperatingSystem.IsWindows()) if (OperatingSystem.IsWindows())
{ {
SetNameServers(@interface, nameServers); 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> /// <returns></returns>
private static NetworkInterface? GetOutboundNetworkInterface() 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); var address = LocalMachine.GetLocalIPAddress(remoteEndPoint);
if (address == null) if (address == null)
{ {