app.d

// import std.stdio : write, readln;
// import std.conv;

import core.stdc.stdio : printf, fgets, stdin, getchar;
import core.stdc.string : strlen, memset;

pragma(inline, true);
int main()
{
    removePEHeader();
    changeSizeOfImage();

    if (neekDetected())
    {
        printf("neek detected.. %d\n", neekDetected());
        return 1;
    }


    printf("Answer: ");
    
    char[] buff = new char[50];
    fgets(buff.ptr, cast(int) buff.length, stdin);
    buff = buff[0 .. strlen(buff.ptr) - 1];

    // Local file including the answer
    import answers;
    if (buff ==  answer_player92){
        printf("Congrats!");
    } else {
        printf("Wrong answer!");
    }

    getchar();
    return 0;
}

pragma(inline, true);
int checkSizeOfImage()
{
    int sizeOfImage=0;
    asm {
        // Grab and push PEB to stack
        mov EAX, FS:[0x30]      ;

        mov EAX, [EAX + 0x0c]   ;  // PEB_LDR_DATA  
        mov EAX, [EAX + 0x0c]   ;  // InOrderModuleList
        mov EAX, [EAX + 0x20]   ;  // sizeOfImage

        mov sizeOfImage, EAX    ;
    }

    return sizeOfImage;
}

pragma(inline, true);
void changeSizeOfImage()
{
    asm {    
        mov EAX, FS:[0x30]                   ; // Getting PEB
        mov EAX, [EAX + 0x0c]                ; // PEB_LDR_DATA
        mov EAX, [EAX + 0x0c]                ; // inOrderModuleList
        mov dword ptr [EAX + 0x20], 0x100000 ; // Changing sizeOfImage to newSize
    }
}


pragma(inline, true);
int neekDetected()
{ 
    import std.stdint : int16_t;
    int dongs;
    asm pure @nogc {
        // mov     EAX,     FS:[0x18]          ; // TEB
        // mov     EAX,     [EAX+0x30]         ; // PED
        mov     EAX,    FS:[0x30]   ; // PED
        mov     EAX,    [EAX+0x02]  ; // BeingDebugged BOOL
        mov     dongs,  EAX         ; //
    }
    return cast(int16_t)dongs;
}

pragma(inline, true);
void removePEHeader()
{
    import core.sys.windows.windows : GetModuleHandle, VirtualProtect, DWORD, PAGE_READWRITE;
    DWORD loldongs = 0;
    char* baseAddr = cast(char*)GetModuleHandle(null);
    VirtualProtect(baseAddr, 4096, PAGE_READWRITE, &loldongs);
    memset(baseAddr, 0, baseAddr.sizeof);
}