Adding more GM Commands

[Zhein]

Hi, as the title says, is it possible to modify the game.exe and add more GM commands or commands for players to use just like /wings on and /wings off.

 

[Bowie]

yeah. pass the chat text to a function and create an argument vector. then, use the size() method to get the argument count. figure out how to check authorization client-side and server-side. i would check both and dc them if the server-side check fails.

i'm sure this could be better, but it's a simple enough example to get anyone started. the game.exe version is 0x16021200. if it's just an on/off command you can evaluate the whole string if you want.

#include <sstream>
#include <string>
#include <vector>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#include <include/main.h>
#include <include/util.h>
using namespace shaiya;

int command_handler(char* text)
{
    std::istringstream iss(text);
    std::vector<std::string> argv;

    for (std::string str; std::getline(iss, str, ' '); )
        argv.push_back(str);

    if (argv.empty())
        return 0;

    auto argc = argv.size();

    if (iss.str() == "/example on")
    {
        // do something
        return 0;
    }

    if (iss.str() == "/example off")
    {
        // do something
        return 0;
    }

    if (argv[0] == "/example")
    {
        if (argc != 2)
        {
            // wrong number of arguments
            return 0;
        }

        auto arg1 = argv[1];
 
        // do something
        return 0;
    }

    return 1;
}

unsigned u0x4867A6 = 0x4867A6;
unsigned u0x487532 = 0x487532;
void __declspec(naked) naked_0x4867A1()
{
    __asm
    {
        pushad

        push edi // text
        call command_handler
        add esp,0x4
        test eax,eax

        popad

        je _0x487532

        // original
        push 0x13D4
        jmp u0x4867A6

        _0x487532:
        jmp u0x487532
    }
}

void hook::chat()
{
    // command handler
    util::detour((void*)0x4867A1, naked_0x4867A1, 5);
}

 

[Zhein]

does this send a packet to the server as well? I am actually planning to add "/call" similar to EG but in EP4.5 to EP6 clients.

 

[Bowie]

does this send a packet to the server as well? I am actually planning to add "/call" similar to EG but in EP4.5 to EP6 clients.

no. there's a typedef of the packet send function in my repo.