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// Lodestone client — injected into Minecraft, drawn inside its own window.
//
// Flow:
// DllMain spawns a thread so the loader lock is released at once
// init waits for glfw.dll, then hooks glfwSwapBuffers
// swap_buffers runs once per frame on the game's render thread: reads the
// game through JNI, draws the menu into the frame the game
// just built, then calls on
//
// Running on the render thread is what makes the JNI side simple: it is a Java
// thread, already attached, and the game is not concurrently mutating the
// objects we touch.
#include <windows.h>
#include <atomic>
#include <cmath>
#include <string>
#include <vector>
#include "MinHook.h"
#include "actions.hpp"
#include "cheats.hpp"
#include "config.hpp"
#include "interact.hpp"
#include "jni.hpp"
#include "log.hpp"
#include "mc.hpp"
#include "overlay.hpp"
#include "state.hpp"
#include "world.hpp"
namespace {
using PFNSwapBuffers = void (*)(void*);
PFNSwapBuffers g_original = nullptr;
void* g_target = nullptr;
std::atomic<bool> g_unloading{false};
std::atomic<uint64_t> g_frames{0};
/// How many threads are inside the detour. The hook must not be removed from
/// another thread while this is above zero.
std::atomic<int> g_in_detour{0};
constexpr const char* kUnloadMarker = "unload";
/// A busy world can hold thousands of entities and this runs every frame.
constexpr int kMaxScan = 4096;
/// Everything that may only be touched from the render thread.
struct Render {
lodestone::jni::Env env;
lodestone::mc::Mc mc;
lodestone::mc::World world;
lodestone::mc::Interact interact;
lodestone::mc::Actions actions;
lodestone::cheats::Saved saved;
bool ready = false;
bool failed = false;
bool probed = false;
};
Render g_render;
/// One-time report that the inventory bindings actually found anything. These
/// are optional lookups, so a silent null would otherwise look identical to
/// "you are not carrying one".
void probe_inventory(const lodestone::jni::Env& j, jobject player) {
if (g_render.probed) return;
g_render.probed = true;
lodestone::logf("interact: totem=%d crystal=%d mace=%d selected=%d",
g_render.interact.find_totem(j, player),
g_render.interact.find_crystal(j, player),
g_render.interact.find_mace(j, player),
g_render.interact.selected_slot(j, player));
}
/// Pull this frame's game state across into the shared state the menu reads.
void read_game() {
using namespace lodestone;
if (g_render.failed) return;
if (!g_render.ready) {
JavaVM* vm = jni::java_vm();
if (!vm) return; // the JVM is there; it may simply not be up yet
g_render.env = jni::Env::current(vm);
if (!g_render.env) {
log("this thread is not attached to the JVM");
g_render.failed = true;
return;
}
std::vector<std::string> missing;
if (!g_render.mc.resolve(g_render.env, missing)) {
log("minecraft bindings failed — version too different");
g_render.failed = true;
return;
}
g_render.world.resolve(g_render.env, g_render.mc, missing);
g_render.interact.resolve(g_render.env, g_render.mc, missing);
g_render.actions.resolve(g_render.env, g_render.mc, missing);
for (const auto& m : missing) log("unresolved: " + m);
if (missing.empty()) log("all minecraft names resolved");
// Pick up settings from the last session, if there are any.
state::with([](state::Shared& s) {
if (config::load(s)) log("config loaded");
});
g_render.ready = true;
}
const jni::Env& j = g_render.env;
// Every frame inside a local reference frame, so the references made while
// scanning are released together instead of leaking the heap away.
jni::Frame frame(j, 256);
if (!frame) return;
jobject instance = g_render.mc.instance(j);
if (!instance) return;
// One copy of the settings for the whole frame, taken before the scan so
// the scan and the modules cannot disagree about what is switched on — and
// so the lock is never held while we are inside JNI.
state::Config cfg = state::with([](state::Shared& s) { return s.cfg; });
jobject player = g_render.mc.player(j, instance);
bool screen = g_render.mc.screen_open(j, instance);
state::GameState game;
game.screen_open = screen;
game.in_world = player != nullptr;
if (player) {
g_render.mc.position(j, player, &game.pos);
game.eye = game.pos;
game.eye.y += 1.62; // standing eye height
// The FOV the world is actually rendered with, so the ESP projection
// matches instead of assuming the default.
float fov = g_render.mc.fov(j, instance);
if (fov > 1.0f) game.fov = fov;
game.yaw = g_render.mc.yaw(j, player);
game.pitch = g_render.mc.pitch(j, player);
game.on_ground = g_render.mc.on_ground(j, player);
game.health = g_render.mc.health(j, player);
// Counts down from 10 after damage lands, so a rise is a hit arriving —
// which is what the totem and the shield react to.
game.hurt_time = g_render.world.hurt_time(j, player);
game.sprinting = g_render.actions.sprinting(j, player);
probe_inventory(j, player);
// Entity scan. This is what the ESP and the aura will both read from,
// so it happens once per frame rather than once per feature.
if (jobject level = g_render.mc.level(j, instance)) {
if (jobject iterator = g_render.world.entity_iterator(j, level)) {
for (int n = 0; n < kMaxScan; ++n) {
jobject entity = g_render.world.iter_next(j, iterator);
if (!entity) break;
if (!j.same_object(entity, player) && g_render.mc.is_alive(j, entity)) {
state::Target t;
if (g_render.world.bounding_box(j, entity, &t.min, &t.max)) {
t.kind = g_render.world.classify(j, g_render.mc, entity);
// Everything extending Player classifies as one,
// which is how NPCs, holograms and duplicate clone
// entities end up drawn as people. Only something
// the server lists in the tab list is really a
// player; when the lookup cannot answer, leave it
// alone rather than risk hiding someone real.
if (t.kind == state::TargetKind::Player) {
bool known = false;
bool listed =
g_render.world.tab_player(j, player, entity, &known);
if (known && !listed) t.kind = state::TargetKind::Other;
}
double cx = (t.min.x + t.max.x) * 0.5;
double cy = (t.min.y + t.max.y) * 0.5;
double cz = (t.min.z + t.max.z) * 0.5;
double dx = cx - game.eye.x, dy = cy - game.eye.y,
dz = cz - game.eye.z;
t.distance = static_cast<float>(std::sqrt(dx * dx + dy * dy + dz * dz));
t.invisible = g_render.world.is_invisible(j, entity);
// Health only exists on living things, and without
// it the ESP's health bars have nothing to draw.
if (j.is_instance(entity, g_render.mc.living_class())) {
t.health = g_render.mc.health(j, entity);
t.max_health = g_render.mc.max_health(j, entity);
}
if (t.kind == state::TargetKind::Player) {
t.name = g_render.world.name(j, entity);
// Round-trip time the server already reports in
// the tab list — nothing is probed for it.
if (cfg.esp.show_ping) {
t.ping = g_render.world.ping_of(j, player, entity);
}
// Whether its *own* reach already covers you,
// taken from its synced attribute rather than a
// guess at vanilla's three blocks.
if (cfg.esp.show_threat) {
double reach = g_render.world.attribute(
j, entity, g_render.world.holder_entity_reach());
t.can_reach_you =
reach > 0.0 &&
static_cast<double>(t.distance) <= reach + 0.6;
}
if (cfg.esp.show_gear) {
g_render.world.entity_intel(j, entity, &t.held, &t.armor,
&t.effects);
}
}
game.targets.push_back(std::move(t));
}
}
j.delete_local(entity);
}
j.delete_local(iterator);
}
}
}
state::with([&](state::Shared& s) { s.game = game; });
// Modules run against the copy taken above, so the lock is never held while
// we are inside JNI — the window procedure has to stay responsive.
cheats::apply(j, g_render.mc, g_render.world, g_render.interact, g_render.actions, instance,
player, cfg, game, g_render.saved);
}
void swap_buffers(void* window) {
g_in_detour.fetch_add(1, std::memory_order_seq_cst);
if (!g_unloading.load(std::memory_order_seq_cst)) {
uint64_t n = g_frames.fetch_add(1, std::memory_order_relaxed);
if (n % 600 == 0) lodestone::logf("frame %llu", static_cast<unsigned long long>(n));
read_game();
lodestone::overlay::frame(window);
}
if (g_original) g_original(window);
g_in_detour.fetch_sub(1, std::memory_order_seq_cst);
}
bool marker_present() {
std::string path = lodestone::client_dir() + kUnloadMarker;
return GetFileAttributesA(path.c_str()) != INVALID_FILE_ATTRIBUTES;
}
DWORD WINAPI init(LPVOID) {
lodestone::log("--- lodestone c++ client starting ---");
// The game loads GLFW early, but not necessarily before us.
HMODULE glfw = nullptr;
for (int i = 0; i < 600 && !glfw; ++i) {
glfw = GetModuleHandleA("glfw.dll");
if (!glfw) Sleep(100);
}
if (!glfw) {
lodestone::log("glfw.dll never appeared — giving up");
return 1;
}
g_target = reinterpret_cast<void*>(GetProcAddress(glfw, "glfwSwapBuffers"));
if (!g_target) {
lodestone::log("glfw.dll does not export glfwSwapBuffers");
return 1;
}
lodestone::logf("glfwSwapBuffers at %p", g_target);
bool hooked = false;
if (MH_Initialize() == MH_OK &&
MH_CreateHook(g_target, reinterpret_cast<void*>(&swap_buffers),
reinterpret_cast<void**>(&g_original)) == MH_OK &&
MH_EnableHook(g_target) == MH_OK) {
hooked = true;
lodestone::log("hook installed");
} else {
lodestone::log("hook failed");
}
// Watchdog: the loader drops a marker file to ask us to leave, which is how
// a rebuild gets the old copy out of the way without restarting the game.
for (;;) {
Sleep(250);
if (!marker_present()) continue;
if (!hooked) {
lodestone::log("unload marker seen; nothing was hooked");
return 0;
}
// If the detour has never run, the game is not drawing and the render
// thread will never see the request — which used to strand the hook
// until the game was restarted, blocking every later build. Nothing can
// be inside a detour that has never executed, so in that one case it is
// safe to pull the hook from here rather than wait for a frame that is
// not coming.
if (g_frames.load(std::memory_order_seq_cst) == 0) {
g_unloading.store(true, std::memory_order_seq_cst);
MH_DisableHook(g_target);
lodestone::log("unload marker seen with no frame ever drawn; hook removed off-thread");
return 0;
}
g_unloading.store(true, std::memory_order_seq_cst);
// Let any thread already inside the detour leave before the hook goes.
for (int i = 0; i < 200 && g_in_detour.load(std::memory_order_seq_cst) > 0; ++i) Sleep(5);
lodestone::overlay::shutdown();
MH_DisableHook(g_target);
lodestone::log("unloaded: hook removed — module stays resident");
return 0;
}
}
} // namespace
// The module is deliberately never unmapped. A DLL that patched a window
// procedure and left thread-locals behind cannot prove nothing still points
// into its code, and unmapping it while one pointer survives crashes the game.
// Unloading unhooks and goes inert; a game restart is what clears it.
BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID) {
if (reason == DLL_PROCESS_ATTACH) {
lodestone::g_module = module;
DisableThreadLibraryCalls(module);
CreateThread(nullptr, 0, init, nullptr, 0, nullptr);
}
return TRUE;
}
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