From 29ef5d63793ae76d2c7c4217548375e73efa6e52 Mon Sep 17 00:00:00 2001
From: momo5502 <mauriceheumann@gmail.com>
Date: Sun, 11 Jun 2017 21:24:32 +0200
Subject: [PATCH] [AntiCheat] Add redundant code scanners

---
 src/Components/Modules/AntiCheat.cpp | 40 ++++++++++++++++++++++++++++
 src/Components/Modules/AntiCheat.hpp |  4 +++
 src/Components/Modules/Changelog.cpp |  4 +++
 src/Components/Modules/Menus.cpp     |  4 +++
 4 files changed, 52 insertions(+)

diff --git a/src/Components/Modules/AntiCheat.cpp b/src/Components/Modules/AntiCheat.cpp
index a8228db2..4c23ae0d 100644
--- a/src/Components/Modules/AntiCheat.cpp
+++ b/src/Components/Modules/AntiCheat.cpp
@@ -229,6 +229,46 @@ namespace Components
 		AntiCheat::Flags |= AntiCheat::IntergrityFlag::MEMORY_SCAN;
 	}
 
+	void AntiCheat::QuickCodeScanner_1()
+	{
+		static Utils::Time::Interval interval;
+		static Utils::Value<std::string> hashVal;
+
+		if (!interval.elapsed(11s)) return;
+		interval.update();
+
+		// Hash .text segment
+		// Add 1 to each value, so searching in memory doesn't reveal anything
+		size_t textSize = 0x2D5FFF;
+		uint8_t* textBase = reinterpret_cast<uint8_t*>(0x400FFF);
+		std::string hash = Utils::Cryptography::SHA256::Compute(textBase + 1, textSize + 1, false);
+
+		if (hashVal.isValid() && hash != hashVal.get())
+		{
+			Utils::Hook::Set<BYTE>(0x42A667, 0x90); // Crash
+		}
+
+		hashVal.set(hash);
+	}
+
+	void AntiCheat::QuickCodeScanner_2()
+	{
+		static Utils::Time::Interval interval;
+		static Utils::Value<std::string> hashVal;
+
+		if (!interval.elapsed(12s)) return;
+		interval.update();
+
+		// Hash .text segment
+		std::string hash = Utils::Cryptography::SHA1::Compute(reinterpret_cast<uint8_t*>(0x401000), 0x2D6000, false);
+		if (hashVal.isValid() && hash != hashVal.get())
+		{
+			Utils::Hook::Set<BYTE>(0x40797C, 0x90); // Crash
+		}
+
+		hashVal.set(hash);
+	}
+
 #ifdef DEBUG_LOAD_LIBRARY
 	HANDLE AntiCheat::LoadLibary(std::wstring library, HANDLE file, DWORD flags, void* callee)
 	{
diff --git a/src/Components/Modules/AntiCheat.hpp b/src/Components/Modules/AntiCheat.hpp
index ce82edc3..5c0b5279 100644
--- a/src/Components/Modules/AntiCheat.hpp
+++ b/src/Components/Modules/AntiCheat.hpp
@@ -31,6 +31,10 @@ namespace Components
 
 		static void VerifyThreadIntegrity();
 
+		static void QuickCodeScanner_1();
+		static void QuickCodeScanner_2();
+		static void QuickCodeScanner_3();
+
 	private:
 		enum IntergrityFlag
 		{
diff --git a/src/Components/Modules/Changelog.cpp b/src/Components/Modules/Changelog.cpp
index 6dc2d719..e45e937f 100644
--- a/src/Components/Modules/Changelog.cpp
+++ b/src/Components/Modules/Changelog.cpp
@@ -55,6 +55,10 @@ namespace Components
 
 		// Changelog
 		UIFeeder::Add(62.0f, Changelog::GetChangelogCount, Changelog::GetChangelogText, Changelog::SelectChangelog);
+
+#if !defined(DEBUG) && !defined(DISABLE_ANTICHEAT)
+		Scheduler::OnFrame(AntiCheat::QuickCodeScanner_1);
+#endif
 	}
 
 	Changelog::~Changelog()
diff --git a/src/Components/Modules/Menus.cpp b/src/Components/Modules/Menus.cpp
index 68ba3277..2d8d8ad9 100644
--- a/src/Components/Modules/Menus.cpp
+++ b/src/Components/Modules/Menus.cpp
@@ -766,6 +766,10 @@ namespace Components
 			}
 		});
 
+#if !defined(DEBUG) && !defined(DISABLE_ANTICHEAT)
+		Scheduler::OnFrame(AntiCheat::QuickCodeScanner_2);
+#endif
+
 		Command::Add("mp_QuickMessage", [] (Command::Params*)
 		{
 			Command::Execute("openmenu quickmessage");