empty session with firewall instead of suspend

src/features/empty_session.rs

@@ -1,14 +1,23 @@
-use crate::util::{
+use crate::util::{countdown::Countdown, system_info::SystemInfo};
-    consts::game::{EXE_ENHANCED, EXE_LEGACY},
+use std::{
-    countdown::Countdown,
+    error::Error,
-    system_info::SystemInfo,
+    time::{Duration, Instant},
 };
-use std::time::{Duration, Instant};
+use windows::{
-use windows::Win32::{
+    Win32::{
-    Foundation::{HANDLE, NTSTATUS},
+        NetworkManagement::WindowsFirewall::{
-    System::Threading::{OpenProcess, PROCESS_SUSPEND_RESUME},
+            INetFwPolicy2, INetFwRule, NET_FW_ACTION_BLOCK, NET_FW_IP_PROTOCOL_UDP,
+            NET_FW_RULE_DIR_IN, NET_FW_RULE_DIR_OUT, NetFwPolicy2, NetFwRule,
+        },
+        System::Com::{CLSCTX_INPROC_SERVER, CoCreateInstance},
+    },
+    core::BSTR,
 };
 
+const FILTER_NAME_EMPTY_SESSION_IN: &str = "[GTA Tools] Block inbound UDP traffic for all of GTA V";
+const FILTER_NAME_EMPTY_SESSION_OUT: &str =
+    "[GTA Tools] Block outbound UDP traffic for all of GTA V";
+
 const INTERVAL: Duration = Duration::from_secs(10);
 
 #[derive(Debug)]
@@ -29,52 +38,51 @@ impl Default for EmptySession {
 }
 
 impl EmptySession {
-    pub fn run_timers(&mut self, game_handle: &mut HANDLE) {
+    pub fn run_timers(&mut self) -> Result<(), Box<dyn Error>> {
         if self.disabled {
             self.countdown.count();
         } else {
             self.countdown.reset();
         }
         if self.interval.elapsed() >= INTERVAL {
-            deactivate(game_handle);
+            deactivate()?;
             self.disabled = false;
         }
+        Ok(())
     }
 }
 
-#[link(name = "ntdll")]
+pub fn activate(system_info: &mut SystemInfo) -> Result<bool, Box<dyn Error>> {
-unsafe extern "system" {
+    let Some(exe_path) = system_info.get_game_exe_path() else {
-    unsafe fn NtSuspendProcess(ProcessHandle: HANDLE) -> NTSTATUS;
+        log::info!("wasn't able to find game exe");
-    unsafe fn NtResumeProcess(ProcessHandle: HANDLE) -> NTSTATUS;
+        return Ok(false);
-}
-
-fn get_gta_pid(system_info: &mut SystemInfo) -> Option<u32> {
-    system_info.refresh();
-    system_info
-        .processes()
-        .iter()
-        .find(|p| p.name() == EXE_ENHANCED || p.name() == EXE_LEGACY)
-        .map(|p| p.pid())
-}
-
-pub fn activate(game_handle: &mut HANDLE, system_info: &mut SystemInfo) -> bool {
-    let Some(pid) = get_gta_pid(system_info) else {
-        return false;
     };
-    match unsafe { OpenProcess(PROCESS_SUSPEND_RESUME, false, pid) } {
+    for (direction, filter_name) in [
-        Ok(handle) => *game_handle = handle,
+        (NET_FW_RULE_DIR_IN, FILTER_NAME_EMPTY_SESSION_IN),
-        Err(why) => {
+        (NET_FW_RULE_DIR_OUT, FILTER_NAME_EMPTY_SESSION_OUT),
-            log::error!("failed to suspend game for empty session:\n{why}");
+    ] {
-            return false;
+        let policy: INetFwPolicy2 =
-        }
+            unsafe { CoCreateInstance(&NetFwPolicy2, None, CLSCTX_INPROC_SERVER) }?;
+        let rules = unsafe { policy.Rules() }?;
+        unsafe { rules.Remove(&BSTR::from(filter_name)) }?;
+        let rule: INetFwRule = unsafe { CoCreateInstance(&NetFwRule, None, CLSCTX_INPROC_SERVER) }?;
+        unsafe { rule.SetName(&BSTR::from(filter_name)) }?;
+        unsafe { rule.SetApplicationName(&BSTR::from(exe_path.to_string_lossy().to_string())) }?;
+        unsafe { rule.SetDirection(direction) }?;
+        unsafe { rule.SetEnabled(true.into()) }?;
+        unsafe { rule.SetAction(NET_FW_ACTION_BLOCK) }?;
+        unsafe { rule.SetProtocol(NET_FW_IP_PROTOCOL_UDP.0) }?;
+        unsafe { rules.Add(&rule) }?;
     }
-    unsafe { NtSuspendProcess(*game_handle) }.unwrap();
+    Ok(true)
-    true
 }
 
-pub fn deactivate(game_handle: &mut HANDLE) {
+pub fn deactivate() -> Result<(), Box<dyn Error>> {
-    if !game_handle.is_invalid() {
+    let policy: INetFwPolicy2 =
-        // ignoring the return because this function behaves very weirdly
+        unsafe { CoCreateInstance(&NetFwPolicy2, None, CLSCTX_INPROC_SERVER) }?;
-        let _ = unsafe { NtResumeProcess(*game_handle) };
+    let rules = unsafe { policy.Rules() }?;
+    for filter_name in [FILTER_NAME_EMPTY_SESSION_IN, FILTER_NAME_EMPTY_SESSION_OUT] {
+        unsafe { rules.Remove(&BSTR::from(filter_name)) }?;
     }
+    Ok(())
 }

src/features/game_networking.rs

@@ -82,7 +82,7 @@ impl GameNetworking {
     }
 
     pub fn block_exe(&mut self, system_info: &mut SystemInfo) -> Result<(), Box<dyn Error>> {
-        let Some(exe_path) = get_game_exe_path(system_info) else {
+        let Some(exe_path) = system_info.get_game_exe_path() else {
             return Ok(());
         };
         Self::block_generic(Mode::EntireGame(exe_path.to_path_buf()))?;

src/gui/app.rs

@@ -49,7 +49,6 @@ pub struct App {
     stage: Stage,
     pub flags: Flags,
     pub system_info: SystemInfo,
-    game_handle: windows::Win32::Foundation::HANDLE,
     pub anti_afk: features::anti_afk::AntiAfk,
     empty_session: features::empty_session::EmptySession,
     force_close: features::force_close::ForceClose,
@@ -60,7 +59,7 @@ pub struct App {
 impl eframe::App for App {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         ctx.request_repaint_after(Duration::from_millis(100));
-        self.empty_session.run_timers(&mut self.game_handle);
+        self.empty_session.run_timers().unwrap();
         egui::TopBottomPanel::bottom("bottom_panel")
             .exact_height(25.0)
             .show(ctx, |ui| {
@@ -122,10 +121,7 @@ impl App {
         ui.add_enabled_ui(!self.empty_session.disabled, |ui| {
             ui.horizontal(|ui| {
                 if ui.button("Empty current session").clicked()
-                    && features::empty_session::activate(
+                    && features::empty_session::activate(&mut self.system_info).unwrap()
-                        &mut self.game_handle,
-                        &mut self.system_info,
-                    )
                 {
                     self.empty_session.interval = Instant::now();
                     self.empty_session.disabled = true;
@@ -334,7 +330,9 @@ impl Drop for App {
             settings: self.settings.clone(),
         }
         .set();
-        // make sure we are not suspending game
+        // make sure we are not network blocking game
-        features::empty_session::deactivate(&mut self.game_handle);
+        if let Err(why) = features::empty_session::deactivate() {
+            log::error!("couldn't deactivate empty session: {why}");
+        }
     }
 }