面向对象的WinDivertv2.2的dotnet异步封装，轻松实现网络数据拦截与修改。
<PackageReference Include="WindivertDotnet" Version="1.*" />
- Filter对象支持Lambda构建filter language，脱离字符串的苦海；
- 内存安全的WinDivert对象，基于IOCP的ValueTask异步发送与接收方法；
- 内存安全的WinDivertPacket对象，提供获取包有效数据长度、解包、重构chucksums等；
- WinDivertParseResult提供对解包的数据进行精细修改，修改后对WinDivertPacket直接生效；
| Api | 描述 |
|---|---|
| int Recv(WinDivertPacket, WinDivertAddress) | 同步阻塞读取数据包 |
| int Recv(WinDivertPacket, WinDivertAddress, CancellationToken) | 同步阻塞读取数据包 |
| ValueTask RecvAsync(WinDivertPacket, WinDivertAddress) | 异步IO读取数据包 |
| ValueTask RecvAsync(WinDivertPacket, WinDivertAddress, CancellationToken) | 异步IO读取数据包 |
| int Send(WinDivertPacket, WinDivertAddress) | 同步阻塞发送数据包 |
| int Send(WinDivertPacket, WinDivertAddress, CancellationToken) | 同步阻塞发送数据包 |
| ValueTask SendAsync(WinDivertPacket, WinDivertAddress) | 异步IO发送数据包 |
| ValueTask SendAsync(WinDivertPacket, WinDivertAddress, CancellationToken) | 异步IO发送数据包 |
| Api | 描述 |
|---|---|
| static string Format(string, WinDivertLayer) | 格式化filter |
| static string Compile(string, WinDivertLayer) | 编译filter |
| static Filter True { get; } | 获取值为true的filter |
| static Filter False { get; } | 获取值为false的filter |
| Filter And(Expression<Func<IFilter, bool>>) | 使用and逻辑创建新的fitler |
| Filter And(Filter) | 使用and逻辑创建新的fitler |
| Filter Or(Expression<Func<IFilter, bool>>) | 使用or逻辑创建新的fitler |
| Filter Or(Filter) | 使用or逻辑创建新的fitler |
| Api | 描述 |
|---|---|
| int Capacity { get; } | 获取缓冲区容量 |
| int Length { get; set;} | 获取或设置有效数据的长度 |
| Span Span { get; } | 获取有效数据视图 |
| void Clear() | 将有效数据清0 |
| Span GetSpan(int, int) | 获取缓冲区的Span |
| bool CalcChecksums(WinDivertAddress, ChecksumsFlag) | 重新计算和修改相关的Checksums |
| bool CalcNetworkIfIdx(WinDivertAddress ) | 根据IP地址重新计算和修改addr的Network->IfIdx |
| bool CalcOutboundFlag(WinDivertAddress) | 根据IP地址和addr.Network->IfIdx重新计算和修改addr的Outbound标记 |
| bool CalcLoopbackFlag(WinDivertAddress) | 根据IP地址重新计算和修改addr的Loopback标记 |
| bool DecrementTTL() | ttl减1 |
| int GetHashCode() | 获取包的哈希 |
| int GetHashCode(long) | 获取包的哈希 |
| WinDivertParseResult GetParseResult() | 获取包的解析结果 |
| Api | 描述 |
|---|---|
| IPAddress DstAddress { get; } | 获取目标地址 |
| IPAddress SrcAddress { get; } | 获取源地址 |
| int InterfaceIndex { get; } | 获取网络接口索引 |
| bool IsOutbound { get; } | 获取是否为出口方向 |
| WinDivertRouter(IPAddress) | 构造器 |
| WinDivertRouter(IPAddress, IPAddress) | 构造器 |
| WinDivertRouter(IPAddress, IPAddress, int) | 构造器 |
var filter = Filter.True
.And(f => f.Network.Loopback)
.And(f => f.Tcp.DstPort == 443)
.And(f => f.Tcp.Ack == true);
using var divert = new WinDivert(filter, WinDivertLayer.Network);
using var packet = new WinDivertPacket();
using var addr = new WinDivertAddress();
while(true)
{
// 读包
await divert.RecvAsync(packet, addr);
// 解包
var result = packet.GetParseResult();
// 改包
result.TcpHeader->DstPort = 443;
// 重算checksums
packet.CalcChecksums(addr);
// 修改后发出
await divert.SendAsync(packet, addr);
}