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Fix: Use WMI to set dummy Dns on the tun interface to ensure DNS is hijacked

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This commit is contained in:
ChsBuffer
2021-04-21 18:25:13 +08:00
parent b0086cc854
commit a2326389db
3 changed files with 71 additions and 19 deletions
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51
Netch/Controllers/TUNController.cs
View File

@@ -26,6 +26,8 @@ namespace Netch.Controllers
private IAdapter _tunAdapter = null!;
private IPAddress _serverAddresses = null!;
private const string DummyDns = "6.6.6.6";
public void Start(in Mode mode)
{
var server = MainController.Server!;
@@ -88,10 +90,17 @@ namespace Netch.Controllers
Init();
_tunAdapter = new TunAdapter();
switch (mode.Type)
{
case 1 when Global.Settings.TUNTAP.ProxyDNS:
case 2:
_tunAdapter.NetworkInterface.SetDns(DummyDns);
break;
}
NativeMethods.CreateUnicastIP(AddressFamily.InterNetwork,
Global.Settings.TUNTAP.Address,
(byte)Utils.Utils.SubnetToCidr(Global.Settings.TUNTAP.Netmask),
(byte) Utils.Utils.SubnetToCidr(Global.Settings.TUNTAP.Netmask),
_tunAdapter.InterfaceIndex);
SetupRouteTable(mode);
@@ -162,11 +171,15 @@ namespace Netch.Controllers
if (Global.Settings.TUNTAP.ProxyDNS)
{
Global.Logger.Info("代理 → 自定义 DNS");
if (Global.Settings.TUNTAP.UseCustomDNS)
RouteAction(Action.Create, Global.Settings.TUNTAP.HijackDNS.Select(ip => $"{ip}/32"), RouteType.TUNTAP);
else
RouteAction(Action.Create, $"{Global.Settings.AioDNS.OtherDNS}/32", RouteType.TUNTAP);
Global.Logger.Info("代理 → 占位 DNS");
RouteAction(Action.Create, $"{DummyDns}/32", RouteType.TUNTAP);
if (!Global.Settings.TUNTAP.UseCustomDNS)
{
Global.Logger.Info("代理 → AioDNS OtherDNS");
var otherDns = Global.Settings.AioDNS.OtherDNS;
RouteAction(Action.Create, $"{otherDns[..otherDns.IndexOf(':')]}/32", RouteType.TUNTAP);
}
}
break;
@@ -233,18 +246,18 @@ namespace Netch.Controllers
return false;
IAdapter adapter = routeType switch
{
RouteType.Outbound => _outboundAdapter,
RouteType.TUNTAP => _tunAdapter,
_ => throw new ArgumentOutOfRangeException(nameof(routeType), routeType, null)
};
{
RouteType.Outbound => _outboundAdapter,
RouteType.TUNTAP => _tunAdapter,
_ => throw new ArgumentOutOfRangeException(nameof(routeType), routeType, null)
};
List<string> ipList = routeType switch
{
RouteType.Outbound => _directIPs,
RouteType.TUNTAP => _proxyIPs,
_ => throw new ArgumentOutOfRangeException(nameof(routeType), routeType, null)
};
{
RouteType.Outbound => _directIPs,
RouteType.TUNTAP => _proxyIPs,
_ => throw new ArgumentOutOfRangeException(nameof(routeType), routeType, null)
};
string gateway = adapter.Gateway.ToString();
var index = adapter.InterfaceIndex;
@@ -255,13 +268,13 @@ namespace Netch.Controllers
switch (action)
{
case Action.Create:
result = NativeMethods.CreateRoute(AddressFamily.InterNetwork, ip, (byte)cidr, gateway, index, metric);
if (result && record)
result = NativeMethods.CreateRoute(AddressFamily.InterNetwork, ip, (byte) cidr, gateway, index, metric);
if (record)
ipList.Add(ipNetwork);
break;
case Action.Delete:
result = NativeMethods.DeleteRoute(AddressFamily.InterNetwork, ip, (byte)cidr, gateway, index, metric);
result = NativeMethods.DeleteRoute(AddressFamily.InterNetwork, ip, (byte) cidr, gateway, index, metric);
break;
default:
throw new ArgumentOutOfRangeException(nameof(action), action, null);

1
Netch/Netch.csproj
View File

@@ -44,6 +44,7 @@
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>
<PackageReference Include="System.Drawing.Common" Version="5.0.2" />
<PackageReference Include="System.Management" Version="5.0.0" />
<PackageReference Include="TaskScheduler" Version="2.9.1" />
<PackageReference Include="Vanara.PInvoke.IpHlpApi" Version="3.3.8" />
<PackageReference Include="Microsoft-WindowsAPICodePack-Shell" Version="1.1.4" />

38
Netch/Utils/NetworkInterfaceUtils.cs Normal file
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@@ -0,0 +1,38 @@
using System;
using System.Linq;
using System.Management;
using System.Net.NetworkInformation;
namespace Netch.Utils
{
public static class NetworkInterfaceExtension
{
public static void SetDns(this NetworkInterface ni, string primaryDns, string? secondDns = null)
{
void VerifyDns(ref string s)
{
s = s.Trim();
if (primaryDns.IsNullOrEmpty())
throw new ArgumentException("DNS format invalid", nameof(primaryDns));
}
VerifyDns(ref primaryDns);
if (secondDns != null)
VerifyDns(ref primaryDns);
var wmi = new ManagementClass("Win32_NetworkAdapterConfiguration");
var mos = wmi.GetInstances().Cast<ManagementObject>();
var mo = mos.First(m => m["Description"].ToString() == ni.Description);
var dns = new[] {primaryDns};
if (secondDns != null)
dns = dns.Append(secondDns).ToArray();
var inPar = mo.GetMethodParameters("SetDNSServerSearchOrder");
inPar["DNSServerSearchOrder"] = dns;
mo.InvokeMethod("SetDNSServerSearchOrder", inPar, null);
}
}
}