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spyware293
Newbie cheater
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Joined: 28 Jun 2012
Posts: 13
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 Posted: Thu Jun 28, 2012 11:17 am Post subject: [C++] Intercept send hook |
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| i create a dll that hook to send() function of a game client. now im able to log the packets, but i want to know how to change what my client send. (e.g if client send A then output is send C, if client send D then output is send B) btw, im using detours
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Innovation
Grandmaster Cheater
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Joined: 14 Aug 2008
Posts: 617
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| Posted: Thu Jun 28, 2012 12:15 pm Post subject: |
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| What's your code?
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spyware293
Newbie cheater
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Joined: 28 Jun 2012
Posts: 13
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| Posted: Thu Jun 28, 2012 12:48 pm Post subject: |
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| Code: | #pragma comment(lib, "Ws2_32.lib")
#undef UNICODE
typedef int (WINAPI *SendPtr)(SOCKET s, const char* buf, int len, int flags);
HMODULE hLib = LoadLibrary("ws2_32.dll");
SendPtr pSend = (SendPtr)GetProcAddress(hLib, "send");
int WINAPI MySend(SOCKET s, const 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(&(PVOID&)pSend, MySend);
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)
{
return pSend(s, buf, len, flags);
} |
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Dark Byte
Site Admin
 Reputation: 471
Joined: 09 May 2003
Posts: 25819
Location: The netherlands
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| Posted: Thu Jun 28, 2012 1:48 pm Post subject: |
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Just do you r filter in your MySend function
e.g:
instead of
| Code: |
return pSend(s, buf, len, flags);
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do:
| Code: |
if (buf[0]==0xgg)
buf[0]=0xhh;
return pSend(s, buf, len, flags);
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Or copy the buffer first and change that and then pass that copy to pSend instead of the original
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spyware293
Newbie cheater
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Joined: 28 Jun 2012
Posts: 13
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| Posted: Thu Jun 28, 2012 8:18 pm Post subject: |
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i've tried this
| Code: | if (buf[0]==0x01)
{
buf[0]=0x02;
MessageBox(HWND_DESKTOP,"TEST","TEST",MB_OK);
return pSend(s, buf, len, flags);
}
else
return pSend(s, buf, len, flags); |
but when i tried to sent a packet which contain 01, it doesn't trigger the filter even the messagebox didn't pop up
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spyware293
Newbie cheater
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Joined: 28 Jun 2012
Posts: 13
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| Posted: Fri Jun 29, 2012 4:10 pm Post subject: |
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haha thx dark byte, my problem is solved 
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