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代理的DNAT和webapi

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snltty
2025-09-21 18:35:15 +08:00
parent 57a565a856
commit a8e5ff1f6f
66 changed files with 1811 additions and 483 deletions
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83
src/linker.libs/ChecksumHelper.cs
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@@ -1,15 +1,93 @@
using System;
using System.Buffers.Binary;
using System.Net.Sockets;
namespace linker.libs
{
public sealed class ChecksumHelper
{
/// <summary>
/// 清空IP包的校验和
/// </summary>
/// <param name="ptr"></param>
/// <param name="ipHeader">是否情况IP头校验和</param>
/// <param name="payload">是否清空荷载协议校验和</param>
public static unsafe void ClearChecksum(byte* ptr, bool ipHeader = true, bool payload = true)
{
byte ipHeaderLength = (byte)((*ptr & 0b1111) * 4);
byte* packetPtr = ptr + ipHeaderLength;
if (ipHeader)
{
*(ushort*)(ptr + 10) = 0;
}
if (payload)
{
int index = (ProtocolType)(*(ptr + 9)) switch
{
ProtocolType.Icmp => 2,
ProtocolType.Tcp => 16,
ProtocolType.Udp => 6,
_ => -1,
};
if (index > 0)
{
*(ushort*)(packetPtr + index) = 0;
}
}
}
/// <summary>
/// 计算IP包的校验和，当校验和为0时才计算
/// </summary>
/// <param name="packet">一个完整的IP包</param>
/// <param name="ipHeader">是否计算IP头校验和</param>
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void ChecksumWithZero(ReadOnlyMemory<byte> packet, bool ipHeader = true, bool payload = true)
{
ChecksumWithZero(packet.Span, ipHeader, payload);
}
/// <summary>
/// 计算IP包的校验和，当校验和为0时才计算
/// </summary>
/// <param name="packet">一个完整的IP包</param>
/// <param name="ipHeader">是否计算IP头校验和</param>
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void ChecksumWithZero(ReadOnlySpan<byte> packet, bool ipHeader = true, bool payload = true)
{
fixed (byte* ptr = packet)
{
ChecksumWithZero(ptr, ipHeader, payload);
}
}
/// <summary>
/// 计算IP包的校验和，当校验和为0时才计算
/// </summary>
/// <param name="ptr">IP包指针</param>
/// <param name="ipHeader">是否计算IP头校验和</param>
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void ChecksumWithZero(byte* ptr, bool ipHeader = true, bool payload = true)
{
byte ipHeaderLength = (byte)((*ptr & 0b1111) * 4);
byte* packetPtr = ptr + ipHeaderLength;
ipHeader = ipHeader && *(ushort*)(ptr + 10) == 0;
payload = payload && ((ProtocolType)(*(ptr + 9)) switch
{
ProtocolType.Icmp => *(ushort*)(packetPtr + 2) == 0,
ProtocolType.Tcp => *(ushort*)(packetPtr + 16) == 0,
ProtocolType.Udp => *(ushort*)(packetPtr + 6) == 0,
_ => false,
});
if (ipHeader || payload)
Checksum(ptr, ipHeader, payload);
}
/// <summary>
/// 计算IP包的校验和
/// </summary>
/// <param name="packet">一个完整的IP包</param>
/// <param name="ipHeader">是否计算IP头校验和</param>
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void Checksum(ReadOnlyMemory<byte> packet, bool ipHeader = true, bool payload = true)
{
@@ -19,6 +97,7 @@ namespace linker.libs
/// 计算IP包的校验和
/// </summary>
/// <param name="packet">一个完整的IP包</param>
/// <param name="ipHeader">是否计算IP头校验和</param>
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void Checksum(ReadOnlySpan<byte> packet, bool ipHeader = true, bool payload = true)
{
@@ -31,7 +110,7 @@ namespace linker.libs
/// 计算IP包的校验和
/// </summary>
/// <param name="ptr">IP包指针</param>
/// <param name="ipHeader">是否计算IP校验和</param>
/// <param name="ipHeader">是否计算IP头校验和</param>
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void Checksum(byte* ptr, bool ipHeader = true, bool payload = true)
{