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简化packet修改

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This commit is contained in:
xljiulang 2022-10-28 21:41:01 +08:00
parent 7c203971c1
commit 9f9cbce624
2 changed files with 8 additions and 29 deletions
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35
FastGithub.PacketIntercept/Dns/DnsInterceptor.cs
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@ -119,38 +119,17 @@ namespace FastGithub.PacketIntercept.Dns
var loopback = question.Type == RecordType.A ? IPAddress.Loopback : IPAddress.IPv6Loopback;
var record = new IPAddressResourceRecord(domain, loopback, this.ttl);
response.AnswerRecords.Add(record);
var responsePayload = response.ToArray();
// 修改payload和包长
packet.GetWriter(packet.Length - result.DataLength).Write(responsePayload);
// 修改payload
var writer = packet.GetWriter(packet.Length - result.DataLength);
writer.Write(response.ToArray());
// 修改ip包
IPAddress destAddress;
if (result.IPV4Header != null)
{
destAddress = result.IPV4Header->DstAddr;
result.IPV4Header->DstAddr = result.IPV4Header->SrcAddr;
result.IPV4Header->SrcAddr = destAddress;
result.IPV4Header->Length = (ushort)packet.Length;
}
else
{
destAddress = result.IPV6Header->DstAddr;
result.IPV6Header->DstAddr = result.IPV6Header->SrcAddr;
result.IPV6Header->SrcAddr = destAddress;
result.IPV6Header->Length = (ushort)(packet.Length - sizeof(IPV6Header));
}
// 修改udp包
var destPort = result.UdpHeader->DstPort;
result.UdpHeader->DstPort = result.UdpHeader->SrcPort;
result.UdpHeader->SrcPort = destPort;
result.UdpHeader->Length = (ushort)(sizeof(UdpHeader) + responsePayload.Length);
packet.ReverseEndPoint();
packet.ApplyLengthToHeaders();
packet.CalcChecksums(addr);
packet.CalcOutboundFlag(addr);
addr.Flags |= WinDivertAddressFlag.Impostor;
packet.CalcOutboundFlag(addr);
packet.CalcChecksums(addr);
this.logger.LogInformation($"{domain}->{loopback}");
}

2
FastGithub.PacketIntercept/FastGithub.PacketIntercept.csproj
View File

@ -7,7 +7,7 @@
<ItemGroup>
<FrameworkReference Include="Microsoft.AspNetCore.App" />
<PackageReference Include="DNS" Version="7.0.0" />
<PackageReference Include="WindivertDotnet" Version="1.0.7" />
<PackageReference Include="WindivertDotnet" Version="1.1.0" />
</ItemGroup>
<ItemGroup>