Improve client-side anti-cheat

Based on code from @is-this-c
rafalh · Feb 22, 2025 · 1624e8b · 1624e8b
1 parent 3733d25
commit 1624e8b
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diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
@@ -78,6 +78,7 @@ Version 1.9.0 (not released yet)
 - Search command descriptions in `.` command
 - Improve PF network protocol compatibility
 - Add a spawned player count to the scoreboard
+- Improve client-side anti-cheat
 
 [@Mystyle-48](https://github.com/Mystyle-48)
 - Simplify installation detection in setup and launcher

diff --git a/game_patch/main/main.cpp b/game_patch/main/main.cpp
@@ -36,6 +36,7 @@
 #include "../rf/os/os.h"
 #include "../rf/save_restore.h"
 #include "../rf/gameseq.h"
+#include "../purefaction/pf_ac.h"
 
 #ifdef HAS_EXPERIMENTAL
 #include "../experimental/experimental.h"
@@ -66,6 +67,7 @@ CodeInjection after_full_game_init_hook{
         console_init();
         multi_after_full_game_init();
         debug_init();
+        pf_ac_init();
 
         xlog::info("Game fully initialized");
         xlog::LoggerConfig::get().flush_appenders();

diff --git a/game_patch/os/os.cpp b/game_patch/os/os.cpp
@@ -7,6 +7,7 @@
 #include "../rf/input.h"
 #include "../rf/crt.h"
 #include "../main/main.h"
+#include "../purefaction/pf_ac.h"
 #include "win32_console.h"
 #include <xlog/xlog.h>
 
@@ -40,6 +41,10 @@ LRESULT WINAPI wnd_proc(HWND wnd_handle, UINT msg, WPARAM w_param, LPARAM l_para
             static_cast<void*>(wnd_handle), msg);
     }
 
+    if (!pf_ac_check_wnd_msg(msg, w_param, l_param)) {
+        return DefWindowProcA(wnd_handle, msg, w_param, l_param);
+    }
+
     for (int i = 0; i < rf::num_msg_handlers; ++i) {
         rf::msg_handlers[i](msg, w_param, l_param);
     }

diff --git a/game_patch/purefaction/pf_ac.h b/game_patch/purefaction/pf_ac.h
@@ -9,10 +9,12 @@ namespace rf {
     struct Player;
 }
 
+void pf_ac_init();
 bool pf_ac_process_packet(const void* data, size_t len, const rf::NetAddr& addr, rf::Player* player);
 void pf_ac_init_player(rf::Player* player);
 void pf_ac_verify_player(rf::Player* player);
 pf_pure_status pf_ac_get_pure_status(rf::Player* player);
+bool pf_ac_check_wnd_msg(unsigned msg, long wparam, long lparam);
 
 // callback
 void pf_player_verified(rf::Player* player, pf_pure_status pure_status);
diff --git a/game_patch/purefaction/pf_ac_stubs.cpp b/game_patch/purefaction/pf_ac_stubs.cpp
@@ -8,6 +8,10 @@ bool pf_ac_process_packet(const void*, size_t, const rf::NetAddr&, rf::Player*)
     return false;
 }
 
+void pf_ac_init()
+{
+}
+
 void pf_ac_init_player(rf::Player*)
 {
 }
@@ -21,3 +25,8 @@ pf_pure_status pf_ac_get_pure_status(rf::Player*)
 {
     return pf_pure_status::none;
 }
+
+bool pf_ac_check_wnd_msg(unsigned msg, long wparam, long lparam)
+{
+    return true;
+}