gmsv_disconnect_win32

#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN
#include <Windows.h>
#include <string>
#define GMMODULE
#include "Interface.h"

void *sigscan(const char *sig, void *_base)
{
    char *base = (char *)_base;
    while (!IsBadCodePtr((FARPROC)base))
    {
        const char *cursig = sig;
        char *curbase = base;
        while (!IsBadCodePtr((FARPROC)curbase))
        {
            if (*cursig == 0)
                return base;
            if (*cursig != '?' && *cursig != *curbase)
                break;
            cursig++;
            curbase++;
        }

        base++;
    }
    return 0;
}

char newmessage[128] = "Disconnect by user.";

int SetDisconnectMessage(lua_State *state)
{
    strcpy_s(newmessage, sizeof(newmessage), LUA->GetString(1));
    return 0;
}

GMOD_MODULE_OPEN()
{
    // search for "Disconnect by user" xrefs for the sig

    const char ** message = reinterpret_cast<const char **>(
        reinterpret_cast<char *>(sigscan("\x68????\xFF\xD2\x89\x7E\x10\x5F\x5E\x8B\xE5\x5D\xC2\x08\x00", GetModuleHandleA("engine.dll"))) + 1
    );

    DWORD old_prot;
    VirtualProtect(message, sizeof(*message), PAGE_EXECUTE_READWRITE, &old_prot);
    *message = newmessage;
    VirtualProtect(message, sizeof(*message), old_prot, &old_prot);

    LUA->PushCFunction(&SetDisconnectMessage);
    LUA->SetField(-10002, "SetDisconnectMessage");

    return 0;
}

GMOD_MODULE_CLOSE() { return 0; }