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POWinsock recv hooking with Detours
 

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    <p>I've got an application, which uses Winsock 2.0 <code>recv</code> function, and I can catch the output by Redox Packet Editor for example, it confirms that version is 2.0. </p> <p>I have this code to hook the function:</p> <pre><code>#define _CRT_SECURE_NO_DEPRECATE #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #include &lt;windows.h&gt; #include &lt;WinSock2.h&gt; #include &lt;detours.h&gt; #include &lt;stdio.h&gt; #pragma comment(lib, "ws2_32.lib") FILE *pSendLogFile; FILE *pRecvLogFile; int (WINAPI *pSend)(SOCKET s, const char* buf, int len, int flags) = send; int WINAPI MySend(SOCKET s, const char* buf, int len, int flags); int (WINAPI *pRecv)(SOCKET s, char *buf, int len, int flags) = recv; int WINAPI MyRecv(SOCKET s, char* buf, int len, int flags); INT APIENTRY DllMain(HMODULE hDLL, DWORD Reason, LPVOID Reserved) { switch(Reason) { case DLL_PROCESS_ATTACH: DisableThreadLibraryCalls(hDLL); DetourTransactionBegin(); DetourUpdateThread(GetCurrentThread()); DetourAttach(&amp;(PVOID&amp;)pSend, MySend); if(DetourTransactionCommit() == NO_ERROR) MessageBox(0,"send() detoured successfully","asd",MB_OK); DetourTransactionBegin(); DetourUpdateThread(GetCurrentThread()); DetourAttach(&amp;(PVOID&amp;)pRecv, MyRecv); if(DetourTransactionCommit() == NO_ERROR) MessageBox(0,"recv() detoured successfully","asd",MB_OK); break; case DLL_PROCESS_DETACH: case DLL_THREAD_ATTACH: case DLL_THREAD_DETACH: break; } return TRUE; } int WINAPI MySend(SOCKET s, const char* buf, int len, int flags) { MessageBox(0,"sent","sent",MB_OK); return pSend(s, buf, len, flags); } int WINAPI MyRecv(SOCKET s, char* buf, int len, int flags) { MessageBox(0,"recvd","recvd",MB_OK); return pRecv(s, buf, len, flags); } </code></pre> <p>For <code>send</code>, everything works perfectly, but I don't get any output for <code>recv</code>. I tried in another application using 1.1 version of Winsock and it works ok. Tried to hook WSARecv, WSARecvEx without any luck.</p> <p>Checked the app with WinAPIOverride32, it clearly says that it using <code>recv</code> function, and successfuly logs the usage. Winsock Packet Editor is reading the data well too.</p> <p>Any ideas?</p>
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    1. COMy advice: write an LSP (Layered Service Provider) instead. Modifying one of the LSP samples will get you a lot further and might be more encompassing than the hooking approach. Imagine it as a user mode alternative to TDI drivers and friends.
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    2. COAny article or sample code for this LSP? I hope it's not so complicated.
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    3. COSure, this one is still valid for the most part: https://www.microsoft.com/msj/0599/layeredservice/layeredservice.aspx and of course: http://msdn.microsoft.com/en-us/library/windows/desktop/bb513664(v=vs.85).aspx
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