C# 从所选进程读取传出数据包

是否可以在C#中从所选进程读取传出数据包？如果是，我应该使用什么api？

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提前感谢。

您可以使用第三方物流数据流来做到这一点。

当然您可以。。。但前提是该进程对其侦听器具有“公共挂钩”。否则，您将不得不创建一个嗅探器：调试可执行文件，查找套接字发送缓冲区的偏移量，并将读取器挂接到它。通过类似防火墙的应用程序更容易做到这一点。

我假设您正在尝试执行类似WireShark或Winsock数据包编辑器的操作

简而言之，答案是否定的。绝对没有内置功能的命名空间或程序集

P> >长的答案是<强>是的，但是你必须让你的手有点脏。< /强>你将很可能不得不制作一个C++ DLL，以将其注入到“间谍”的进程中。但是，您可以通过C#与此DLL进行接口，并使您的接口全部位于.NET中

你的第一步是创建C++ DLL，只需要几个出口：

bool InitialzeHook()
{
  // TODO: Patch the Import Address Table (IAT) to overwrite
  //       the address of Winsock's send/recv functions
  //       with your SpySend/SpyRecv ones instead.
}

bool UninitializeHook()
{
  // TODO: Restore the Import Address Table (IAT) to the way you found it.
}

// This function will be called instead of Winsock's recv function once hooked.
int SpySend(SOCKET s, const char *buf, int len, int flags)
{
  // TODO: Do something with the data to be sent, like logging it.

  // Call the real Winsock send function.
  int numberOfBytesSent = send(s, buf, len, flags);

  // Return back to the calling process.
  return numberOfBytesSent;
}

// This function will be called instead of Winsock's recv function once hooked.
int SpyRecv(SOCKET s, char *buf, int len, int flags)
{
  // Call the real Winsock recv function to get the data.
  int numberOfBytesReceived = recv(s, buf, len, flags);

  // TODO: Do something with the received data, like logging it.

  // Return back to the calling process.
  return numberOfBytesReceived;
}

其中最困难的部分是修补导入地址表（IAT）的函数。关于如何遍历它并在其中查找函数导入，有各种资源提示：您必须按顺序而不是名称修补Winsock导入

退房并离开

完成所有这些之后，必须将所创建的DLL注入目标进程。下面是C++的pSueDO代码（从我的头顶上）：

不过，你也可以通过C#平台调用（pInvoke）来做同样的事情。如何记录数据并将数据传输回C#监控程序取决于您。您可以在C#中使用一些进程间通信，如，

NamedPipeClientStream

然而，这将做到这一点，最美妙的部分是，它将适用于几乎任何程序。同样的技术可以应用于任何类型的嗅探，而不仅仅是Winsock。

请阅读并重复几次。检查一下

// Get the target window handle (if you don't have the process ID handy).
HWND hWnd = FindWindowA(NULL, "Your Target Window Name");

// Get the process ID from the target window handle.
DWORD processId = 0;
DWORD threadId = GetWindowThreadProcessId(hWnd, &processId);

// Open the process for reading/writing memory.
DWORD accessFlags = PROCESS_VM_OPERATION | 
                    PROCESS_VM_READ | 
                    PROCESS_VM_WRITE | 
                    PROCESS_QUERY_INFORMATION;

HANDLE hProcess = OpenProcess(accessFlags, false, processId);

// Get the base address for Kernel32.dll (always the same for each process).
HMODULE hKernel32 = GetModuleHandleA("kernel32");

// Get the address of LoadLibraryA (always the same for each process).
DWORD loadLibraryAddr = GetProcAddress(hKernel32, "LoadLibraryA");

// Allocate some space in the remote process and write the library string to it.
LPVOID libraryNameBuffer = VirtualAllocEx(hProcess, NULL, 256, 
                                          MEM_COMMIT | MEM_RESERVE,
                                          PAGE_EXECUTE_READWRITE);

LPCSTR libraryName = L"MySpyLibrary.dll\0";
DWORD numberOfBytesWritten = 0;
BOOL writeResult = WriteProcessMemory(hProcess, libraryNameBuffer,
                                                (LPCVOID)libraryName,
                                                strlen(libraryName) + 1,
                                                &numberOfBytesWritten);

// Create a thread in the remote process, using LoadLibraryA as the procedure,
// and the parameter is the library name we just wrote to the remote process.
DWORD remoteThreadId = 0;
HANDLE hRemoteThread = CreateRemoteThread(hProcess, NULL, 0,
                                          (LPTHREAD_START_ROUTINE)loadLibraryAddr,
                                          libraryNameBuffer,
                                          0, &remotThreadId);

// Wait for our thread to complete and get the exit code (which is the return value).
DWORD loadedLibraryAddr = 0;
BOOL waitResult = WaitForSingleObject(hRemoteThread, INFINITE); 
BOOL exitResult = GetExitCodeThread(hRemoteThread, &loadedLibraryAddr);

// TODO: Check that it was loaded properly
// if(lodadedLibraryAddr == NULL) { ... }

// Cleanup our loose ends here.
VirtualFreeEx(hProcess, libraryNameBuffer, 256, MEM_RELEASE);
CloseHandle(hRemoteThread);
CloseHandle(hProcess);