Question

我要做的是使用the Detours library挂钩应用程序WinSock2 send（）和recv（）函数（数据包记录器）。

虽然它适用于send（）函数，但它不适用于recv（）函数。

以下是我的相关代码：

#include <cstdio>
#include <ctime>
#include <fstream>
#include <iomanip>
#include <string>
#include <windows.h>
#include <detours.h>

#pragma comment( lib, "Ws2_32.lib" )
#pragma comment( lib, "detours.lib" )
#pragma comment( lib, "detoured.lib" )
#pragma comment( lib, "Mswsock.lib" )

std::ofstream Logger;

std::string NowToString() {
    time_t rawtime;
    tm *timeinfo = new tm();
    char buffer[32];

    time( &rawtime );
    localtime_s( timeinfo, &rawtime );

    strftime( buffer, 32, "%m/%d/%Y %I:%M:%S %p", timeinfo );

    delete timeinfo;

    return std::string( buffer );
}

std::string TimeToString() {
    time_t rawtime;
    tm *timeinfo = new tm();
    char buffer[32];

    time( &rawtime );
    localtime_s( timeinfo, &rawtime );

    strftime( buffer, 32, "%I:%M:%S %p", timeinfo );

    delete timeinfo;

    return std::string( buffer );
}

void LogPacket( const char *buf, int len ) {
    Logger << "        0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F\n";
    Logger << "       -- -- -- -- -- -- -- --  -- -- -- -- -- -- -- --\n";
    Logger << "0000   ";

    for ( int i = 0; i < len; ++i ) {
        if ( i != 0 && i % 16 == 0 ) {
            Logger << "  ";

            int line = ( i / 16 ) - 1;

            for ( int j = 0; j < 16; ++j ) {
                char c = buf[line * 16 + j];

                if ( c >= 32 && c <= 126 ) {
                    Logger << c;
                } else {
                    Logger << '.';
                }
            }

            Logger << "\n" << std::hex << std::setw( 4 ) << std::setfill( '0' ) << i << std::dec << std::setw( 0 ) << "   ";
        } else if ( i % 16 == 8 ) {
            Logger << ' ';
        }

        Logger << std::hex << std::setw( 2 ) << std::setfill( '0' ) << ( int( buf[i] ) & 0xFF ) << ' ';
        Logger << std::dec << std::setw( 0 );

        if ( i == len - 1 ) {
            int remaining = 16 - ( len % 16 );
            int fill = ( remaining * 3 ) + 2;

            if ( remaining >= 8 ) {
                ++fill;
            }

            for ( int j = 0; j < fill; ++j ) {
                Logger << ' ';
            }

            int line = ( i - ( ( len % 16 ) - 1 ) ) / 16 ;

            for ( int k = 0; k < ( len % 16 ); ++k ) {
                char c = buf[line * 16 + k];

                if ( c >= 32 && c <= 126 ) {
                    Logger << c;
                } else {
                    Logger << '.';
                }
            }
        }
    }

    Logger << "\n\n";
}

int ( WINAPI *Real_Send )( SOCKET s, const char *buf, int len, int flags ) = send;
int ( WINAPI *Real_Recv )( SOCKET s, char *buf, int len, int flags ) = recv;
int ( WINAPI *Real_RecvFrom )( SOCKET s, char *buf, int len, int flags, sockaddr *from, int *fromlen ) = recvfrom;
int ( WINAPI *Real_WSARecvEx )( SOCKET s, char *buf, int len, int *flags ) = WSARecvEx;

int WINAPI Mine_Send( SOCKET s, const char* buf, int len, int flags );
int WINAPI Mine_Recv( SOCKET s, char *buf, int len, int flags );
int WINAPI Mine_RecvFrom( SOCKET s, char *buf, int len, int flags, sockaddr *from, int *fromlen );
int WINAPI Mine_WSARecvEx( SOCKET s, char *buf, int len, int *flags );

int WINAPI Mine_Send( SOCKET s, const char *buf, int len, int flags ) {
    Logger << TimeToString() << ": Client -> Server (Length: " << len << " bytes)\n\n";
    LogPacket( buf, len );
    Logger << std::endl;

    return Real_Send( s, buf, len, flags );
}

int WINAPI Mine_Recv( SOCKET s, char *buf, int len, int flags ) {
    Logger << TimeToString() << ": Server -> Client (Length: " << len << " bytes)\n\n";
    LogPacket( buf, len );
    Logger << std::endl;

    return Real_Recv( s, buf, len, flags );
}

int WINAPI Mine_RecvFrom( SOCKET s, char *buf, int len, int flags, sockaddr *from, int *fromlen ) {
    Logger << TimeToString() << ": Server -> Client (Length: " << len << " bytes)*\n\n";
    LogPacket( buf, len );
    Logger << std::endl;

    return Real_RecvFrom( s, buf, len, flags, from, fromlen );
}

int WINAPI Mine_WSARecvEx( SOCKET s, char *buf, int len, int *flags ) {
    Logger << TimeToString() << ": Server -> Client (Length: " << len << " bytes)**\n\n";
    LogPacket( buf, len );
    Logger << std::endl;

    return Real_WSARecvEx( s, buf, len, flags );
}

BOOL WINAPI DllMain( HINSTANCE, DWORD dwReason, LPVOID ) {
    switch ( dwReason ) {
        case DLL_PROCESS_ATTACH:    
            Logger.open( "C:\\Packets.txt", std::ios::out | std::ios::app | std::ios::ate );

            if ( Logger.tellp() > 0 ) {
                Logger << "\n\n\n";
            }

            Logger << "##\n## Logging Started (" << NowToString() << ")\n##\n\n\n";

            DetourTransactionBegin();
            DetourUpdateThread( GetCurrentThread() );
            DetourAttach( &(PVOID &)Real_Send, Mine_Send );
            DetourAttach( &(PVOID &)Real_Recv, Mine_Recv );
            DetourAttach( &(PVOID &)Real_RecvFrom, Mine_RecvFrom );
            DetourAttach( &(PVOID &)Real_WSARecvEx, Mine_WSARecvEx );
            DetourTransactionCommit();

            break;

        case DLL_PROCESS_DETACH:
            Logger << "##\n## Logging Stopped (" << NowToString() << ")\n##";
            Logger.close();

            DetourTransactionBegin();
            DetourUpdateThread( GetCurrentThread() );
            DetourDetach( &(PVOID &)Real_Send, Mine_Send );
            DetourDetach( &(PVOID &)Real_Recv, Mine_Recv );
            DetourDetach( &(PVOID &)Real_RecvFrom, Mine_RecvFrom );
            DetourDetach( &(PVOID &)Real_WSARecvEx, Mine_WSARecvEx );
            DetourTransactionCommit();

            break;
    }

    return TRUE;
}

有什么想法吗？

编辑：所以我已经连接了recvfrom（）和WSARecvEx（），它仍然没有记录传出的数据包！我用我的确切代码更新了我的代码。

Answer 1

要有效地使用挂钩，你需要确保你真正挂钩所有相关的端点或至少确保最终从所有端点调用的公分母。
在recv()的情况下，我认为应用程序实际上可能会调用WSARecv() 您可以使用depends.exe确切地找出应用程序/库从Ws2_32.dll导入的函数，以了解您需要挂钩的函数。

Answer 2

好吧，几个月后我发现了：当我连接WinSock 1.1的send（）/ recv（）时，我正在挂钩WinSock 2函数！

C ++ - Detours WinSock挂钩

2 个答案: