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/*
* Copyright © 2022 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdbool.h>
#include <stdlib.h>
#include "con_.h"
#include "hook.h"
#include "engineapi.h"
#include "errmsg.h"
#include "intdefs.h"
#include "mem.h"
#include "os.h"
#include "ppmagic.h"
static bool lockdown = false;
#ifdef _WIN32
static void *gamewin, *inhookwin, *inhookthr;
static ulong inhooktid;
// UINT_PTR is a **stupid** typedef, but whatever.
static ssize __stdcall kproc(int code, UINT_PTR wp, ssize lp) {
KBDLLHOOKSTRUCT *data = (KBDLLHOOKSTRUCT *)lp;
if (lockdown && data->flags & LLKHF_INJECTED &&
GetForegroundWindow() == gamewin) {
return 1;
}
return CallNextHookEx(0, code, wp, lp);
}
static ssize __stdcall mproc(int code, UINT_PTR wp, ssize lp) {
MSLLHOOKSTRUCT *data = (MSLLHOOKSTRUCT *)lp;
if (lockdown && data->flags & LLMHF_INJECTED &&
GetForegroundWindow() == gamewin) {
return 1;
}
return CallNextHookEx(0, code, wp, lp);
}
// this is its own thread to meet the strict timing deadline, otherwise the
// hook gets silently removed. plus, we don't wanna incur latency anyway.
static ulong __stdcall inhookthrmain(void *unused) {
if (!SetWindowsHookExW(WH_KEYBOARD_LL, &kproc, 0, 0) ||
!SetWindowsHookExW(WH_MOUSE_LL, &mproc, 0, 0)) {
// intentionally vague message
con_warn("sst: RTA mode is unavailable due to an error\n");
return -1;
}
MSG m; int ret;
while ((ret = GetMessageW(&m, inhookwin, 0, 0)) > 0) DispatchMessage(&m);
if (ret == -1) {
// XXX: if this ever happens, it's a disaster! users might not notice
// their run just dying all of a sudden. with any luck it won't matter
// in practice but... this kind of sucks.
con_warn("** sst: ERROR in message loop, abandoning RTA mode! **");
}
return ret;
}
static bool win32_init(void) {
gamewin = FindWindowW(L"Valve001", 0);
if (!gamewin) {
errmsg_errorsys("failed to get game window handle");
return false;
}
return true;
}
static void inhook_start(void) {
inhookwin = CreateWindowW(L"sst-eventloop", L"sst-eventloop",
WS_DISABLED, 0, 0, 0, 0, HWND_MESSAGE, 0, 0, 0);
inhookthr = CreateThread(0, 0, &inhookthrmain, 0, 0, &inhooktid);
}
// TODO(rta): run this check every tick (or at least X amount of time)
static void inhook_check(void) {
if (WaitForSingleObject(inhookthr, 0) == WAIT_OBJECT_0) {
ulong status;
GetExitCodeThread(inhookthr, &status);
if (status != 0) {
// TODO(rta): stop demos, and stuff.
lockdown = false;
}
}
}
static void inhook_stop(void) {
PostThreadMessageW(inhooktid, WM_QUIT, 0, 0);
if (WaitForSingleObject(inhookthr, INFINITE) == WAIT_FAILED) {
errmsg_warnsys("couldn't wait for thread, status unknown");
// XXX: now what!?
}
}
#else
// TODO(linux): do some stuff, I guess...
#endif
// TODO(rta): call these functions as part of the run lifecycle
static void startlockdown(void) {
if (lockdown) return;
#ifdef _WIN32
inhook_start();
#endif
// FIXME: should really have some semaphore to make sure inhook thread got
// going okay...
lockdown = true;
// TODO(rta): start demos, etc
}
static void endlockdown(void) {
if (!lockdown) return;
#ifdef _WIN32
inhook_stop();
#endif
lockdown = false;
}
bool ac_init(void) {
#if defined(_WIN32)
if (!win32_init()) return false;
#elif defined(__linux__)
// TODO(linux): call init things
#endif
return true;
}
void ac_end(void) {
endlockdown();
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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