bananatools/amcus/amcus.c

#include <windows.h>
#include <unknwnbase.h>
#include <combaseapi.h>
#include <rpcproxy.h>

#include "hook/table.h"

#include "amcus/amcus.h"
#include "amcus/config.h"
#include "amcus/iauth.h"

#include "util/dprintf.h"

// https://dev.s-ul.net/djhackers/bemanitools/-/blob/master/src/main/dinput/device_dinput8.c

static HRESULT STDAPICALLTYPE my_CoCreateInstance(
    const IID *const rclsid,
    LPUNKNOWN pUnkOuter,
    DWORD dwClsContext,
    const IID *const riid,
    LPVOID *ppv);

static HRESULT (STDAPICALLTYPE *next_CoCreateInstance)(
    const IID *const rclsid,
    LPUNKNOWN pUnkOuter,
    DWORD dwClsContext,
    const IID *const riid,
    LPVOID *ppv);

static const struct hook_symbol amcus_hook_syms[] = {
    {
        .name  = "CoCreateInstance",
        .patch = my_CoCreateInstance,
        .link  = (void **) &next_CoCreateInstance,
    }
};

HRESULT amcus_hook_init(struct amcus_config *cfg)
{
    assert(cfg != NULL);

    amcus_config_load(cfg, L".\\bananatools.ini");
    iauth_set_config(cfg);

    if (!cfg->enable) {
        return S_OK;
    }

    dprintf("AMCUS: init\n");

    hook_table_apply(
            NULL,
            "ole32.dll",
            amcus_hook_syms,
            _countof(amcus_hook_syms));

    return S_OK;
}

static HRESULT STDAPICALLTYPE my_CoCreateInstance(
    const IID *const rclsid,
    LPUNKNOWN pUnkOuter,
    DWORD dwClsContext,
    const IID *const riid,
    LPVOID *ppv)
{
    if (IsEqualGUID(rclsid, &amcus_rclsid)) {
        dprintf("AMCUS: CoCreateInstance GUID match\n");
        *ppv = iauth_stub;
        return S_OK;
    }

    return next_CoCreateInstance(rclsid, pUnkOuter, dwClsContext, riid, ppv);
}