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  1. #1
    Vitalka
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    Problem with Send packet at hooked recv/send

    Hey guys why this source doesnt work for me? Please help me whats the mistake?

    If the programm start with the injected dll, it crash and i get a windows error. More i dont know.
    Code:
    // dllmain.cpp : Definiert den Einstiegspunkt für die DLL-Anwendung.
    #include "stdafx.h"
    #include <iostream>
    #include <fstream>
    #include <string>
    #include <windows.h>
    #include <winsock2.h>
    
    #pragma comment(lib,"ws2_32.lib")
    
    using namespace std;
    
    typedef int ( WINAPI *realConnect )(SOCKET s, const struct sockaddr* name, int namelen );
    typedef int (WINAPI* realRecv)(SOCKET socket, const char* buffer, int length, int flags);
    typedef int (WINAPI* realSend)(SOCKET socket, const char* buffer, int length, int flags);
    
    realSend o_send;
    realRecv o_recv;
    realConnect o_connect;
    
    SOCKET Bot;
    
    int WINAPI my_connect( SOCKET s, const struct sockaddr* name, int namelen)
    {
    	WORD port = ntohs((*(WORD*)name->sa_data));
    	sockaddr_in *sockaddr = (sockaddr_in*)name;
    	sockaddr->sin_port = htons(16000);
    	if ( port != 80 )
    	{
    	sockaddr->sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    	}
    	return o_connect(s,name,namelen);
    }
    
    int WINAPI my_send(SOCKET socket, const char* buffer, int length, int flags) 
    {
    	send(Bot, buffer, length, flags);
    	return o_send(socket, buffer, length, flags);
    }
    
    int WINAPI my_recv(SOCKET socket, const char* buffer, int length, int flags) 
    {
    	send(Bot, buffer, length, flags);
    	return o_recv(socket, buffer, length, flags);
    }
    
    BOOL APIENTRY DllMain( HMODULE hModule,
                           DWORD  ul_reason_for_call,
                           LPVOID lpReserved )
    {
    	switch (ul_reason_for_call)
    	{
    	case DLL_PROCESS_ATTACH:
    		//Socketpart
    		WSADATA wsa;
    		WSAStartup(MAKEWORD(2,2), &wsa);
    
    		Bot=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    		SOCKADDR_IN addr;
    		memset(&addr,0,sizeof(SOCKADDR_IN)); 
            addr.sin_family=AF_INET;
            addr.sin_port=htons(16000);
            addr.sin_addr.s_addr=inet_addr("127.0.0.1");
    
    		short status;
    		status=connect(Bot,(SOCKADDR*)(&addr),sizeof(addr));
    		if (status==SOCKET_ERROR)
    		{
    			MessageBox(NULL, TEXT("Bot dont exists"), TEXT("Error"), MB_OK);
    			exit(0);
    		}
    		/////////////////////////////////////////////////////
    		HMODULE hWS32 = LoadLibraryA( "ws2_32.dll" );
    		FARPROC pConnect = GetProcAddress(hWS32,"connect");
    		FARPROC pSend = GetProcAddress(hWS32,"send");
    		FARPROC pRecv = GetProcAddress(hWS32,"recv");
    		//DetourCreate((LPVOID)pConnect,my_connect,5);
    		//__asm mov [ o_connect ], eax;
    		DetourCreate((LPVOID)pSend,my_send,5);
    		__asm mov [ o_send ], eax;
    		DetourCreate((LPVOID)pRecv,my_recv,5);
    		__asm mov [ o_recv ], eax;
    		break;
    	}
    	return true;
    }
    Last edited by Vitalka; 2012-01-22 at 02:45 PM.

  2. #2
    Awal
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    this is source code packet editor right?
    Sorry for my bad English

  3. #3
    emoisback
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    may u put your promblem?..
    what's going on with you code?..
    maybe its help someone who want helping you..
    Learn from PGC for Share on PGC..


    For another Stuff i have make try to find it [Please, register to view links]
    If i have help you, please thanks and respect ..

  4. #4
    Vitalka
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    It hooks the buffer from recv and send of the ingame function. I need to send the buffer to my application, but the send doesnt work

  5. #5
    Awal
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    the application not work or crashed,may you false/wrong editing try to correct them
    Sorry for my bad English

  6. #6
    Vitalka
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    its right. its crashing yes

  7. #7
    Sirmabus
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    As soon as you start the application you should have a window of time where you can connect a debugger to your application.
    Just put a hardware break point on "send" and trace the code.

    Also if there is some problem attaching a debugger before your target makes it's first send(), you can try just putting a "int3" break in your hook which might allow you to attach JIT (just in time) debugger.

    The easiest way to solve such problems is just look at it in a debugger.

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