added x86 support and cleaned the code up

hook.cpp

@@ -1,42 +0,0 @@
-#include "hook.hpp"
-
-namespace hook
-{
-	//--- default constructor
-	detour::detour(void* addr_to_hook, void* jmp_to_addr)
-		: hook_addr((std::uintptr_t)addr_to_hook), detour_addr((std::uintptr_t)jmp_to_addr)
-	{
-		//finish the shellcode by adding the address to jmp to
-		*(uintptr_t*)(jmp_code + OFFSET_TO_ADDRESS) = (std::uintptr_t)jmp_to_addr;
-		//save old bytes
-		memcpy(org_bytes, (void*)hook_addr, JMP_CODE_SIZE);
-		//install the hook.
-		install();
-	}
-
-	detour::~detour()
-	{uninstall();}
-
-	void detour::install()
-	{
-		//install the hook.
-		write_to_readonly((void *)hook_addr, jmp_code, JMP_CODE_SIZE);
-		hook_installed = true;
-	}
-
-	void detour::uninstall()
-	{
-		//write the original bytes back.
-		write_to_readonly((void *)hook_addr, org_bytes, JMP_CODE_SIZE);
-		hook_installed = false;
-	}
-
-	uintptr_t detour::hook_address()
-	{return hook_addr;}
-
-	uintptr_t detour::detour_address()
-	{return detour_addr;}
-
-	bool detour::installed()
-	{return hook_installed;}
-}

hook.hpp

@@ -1,29 +1,82 @@
 #pragma once
 #include <Windows.h>
 #include <map>
+#include <atomic>
 #include <memory>
 
-#define JMP_CODE_SIZE 14
-#define OFFSET_TO_ADDRESS 0x2
+#if _M_IX86
+	#define OFFSET_TO_ADDRESS 0x1
+#elif _M_X64
+	#define OFFSET_TO_ADDRESS 0x2
+#endif
 
 namespace hook
 {
+	static void write_to_readonly(void* addr, void* data, int size)
+	{
+		DWORD old_flags;
+		VirtualProtect((LPVOID)addr, size, PAGE_READWRITE, &old_flags);
+		memcpy((void*)addr, data, size);
+		VirtualProtect((LPVOID)addr, size, old_flags, &old_flags);
+	}
+
 	class detour
 	{
 	public:
-		detour(void* addrToHook, void* jmpTo);
-		~detour();
-		void install();
-		void uninstall();
-		bool installed();
-		uintptr_t hook_address();
-		uintptr_t detour_address();
+		detour(void* addr_to_hook, void* jmp_to, bool enable = true)
+			: hook_addr(addr_to_hook), detour_addr(jmp_to)
+		{
+			//setup hook
+			memcpy(
+				jmp_code + OFFSET_TO_ADDRESS,
+				&jmp_to,
+				sizeof(jmp_to)
+			);
+			//save bytes
+			memcpy(
+				org_bytes,
+				hook_addr,
+				sizeof(org_bytes)
+			);
+			if(enable)
+				install();
+		}
+
+		void install()
+		{
+			write_to_readonly(hook_addr, jmp_code, sizeof(jmp_code));
+			hook_installed.exchange(true);
+		}
+		void uninstall()
+		{
+			write_to_readonly(hook_addr, org_bytes, sizeof(org_bytes));
+			hook_installed.exchange(false);
+		}
+
+		~detour() { uninstall(); }
+		bool installed() { return hook_installed; }
+		void* hook_address() { return hook_addr; }
+		void* detour_address() { return detour_addr; }
 	private:
-		bool hook_installed{ false };
-		uintptr_t hook_addr, detour_addr;
-		unsigned char jmp_code[JMP_CODE_SIZE] = {
-			0x48, 0xb8,						//movabs rax, &jmpTo
-			0x0,							//jmpTo address will be here in these 0's
+		std::atomic<bool> hook_installed{ false };
+		void *hook_addr, *detour_addr;
+
+#if _M_IX86
+		/*
+			0:  b8 ff ff ff ff          mov    eax, 0xffffffff
+			5:  ff e0                   jmp    eax
+		*/
+		unsigned char jmp_code[7] = {
+			0xb8, 0x0, 0x0, 0x0, 0x0,
+			0xFF, 0xE0
+		};
+#elif _M_X64
+		/*
+			0:  48 c7 c0 ff ff ff ff    mov    rax,0xffffffffffffffff
+			7:  ff e0                   jmp    rax
+		*/
+		unsigned char jmp_code[12] = {
+			0x48, 0xb8,						
 			0x0,							
 			0x0,
 			0x0,
@@ -31,21 +84,14 @@ namespace hook
 			0x0,
 			0x0,
 			0x0,
-			0xff, 0xe0,						//jmp rax
-			0x90, 0x90						//nop, nop
+			0x0,
+			0xff, 0xe0						
 		};
-		char org_bytes[JMP_CODE_SIZE];
+#endif
+		std::uint8_t org_bytes[sizeof(jmp_code)];
 	};
 
-	static std::map<uintptr_t, std::unique_ptr<detour>> hooks{};
-
-	__forceinline void write_to_readonly(void* addr, void* data, int size)
-	{
-		DWORD old_flags;
-		VirtualProtect((LPVOID)addr, size, PAGE_READWRITE, &old_flags);
-		memcpy((void*)addr, data, size);
-		VirtualProtect((LPVOID)addr, size, old_flags, &old_flags);
-	}
+	static std::map<void*, std::unique_ptr<detour>> hooks{};
 
 	/*
 	Author: xerox
@@ -53,16 +99,16 @@ namespace hook
 
 	Create Hook without needing to deal with objects
 	*/
-	__forceinline void install(void* addr_to_hook, void* jmp_to_addr) {
-		
+	static void make_hook(void* addr_to_hook, void* jmp_to_addr, bool enable = true)
+	{	
 		if (!addr_to_hook)
 			return;
-
 		hooks.insert({
-			(std::uintptr_t)addr_to_hook,
+			addr_to_hook,
 			std::make_unique<detour>(
 				addr_to_hook,
-				jmp_to_addr
+				jmp_to_addr,
+				enable
 			)}
 		);
 	}
@@ -73,11 +119,11 @@ namespace hook
 
 	Enable hook given the address to hook
 	*/
-	__forceinline void enable(void* addr)
+	static void enable(void* addr)
 	{
 		if (!addr)
 			return;
-		hooks.at((std::uintptr_t)addr)->install();
+		hooks.at(addr)->install();
 	}
 
 	/*
@@ -86,11 +132,11 @@ namespace hook
 
 	Disable hook givent the address of the hook
 	*/
-	__forceinline void disable(void* addr)
+	static void disable(void* addr)
 	{
 		if (!addr)
 			return;
-		hooks.at((std::uintptr_t)addr)->uninstall();
+		hooks.at(addr)->uninstall();
 	}
 
 
@@ -100,10 +146,10 @@ namespace hook
 
 	Remove hook completely from vector
 	*/
-	__forceinline void remove(void* addr)
+	static void remove(void* addr)
 	{
 		if (!addr)
 			return;
-		hooks.erase((std::uintptr_t)addr);
+		hooks.erase(addr);
 	}
 }

main.cpp

@@ -10,33 +10,47 @@ BOOL HookWriteFile(
     LPOVERLAPPED lpOverlapped
 )
 {
-    
     //this will change the output to "shithooked!\n"
-    
-    memset((void *)lpBuffer, NULL, nNumberOfBytesToWrite);
-    memcpy((void*)lpBuffer, "shithooked!?\n", sizeof("shithooked!\n"));
+    const char* shithooked = "shithooked!?";
     hook::disable(&WriteFile);
-    BOOL result = WriteFile(hFile, lpBuffer, nNumberOfBytesToWrite, lpNumberOfBytesWritten, lpOverlapped);
+    BOOL result = WriteFile(
+        hFile,
+        shithooked,
+        nNumberOfBytesToWrite,
+        lpNumberOfBytesWritten, 
+        lpOverlapped
+    );
     hook::enable(&WriteFile);
     return result;
 }
 
 int main()
 {
-    hook::install(
+    //make hook
+    hook::make_hook(
         &WriteFile,
-        &HookWriteFile
+        &HookWriteFile,
+        false // you can choose not to install it yet
     );
 
-    OFSTRUCT ofstruct;
-    OpenFile("output.txt", &ofstruct, OF_CREATE);
-    HFILE result = OpenFile("output.txt", &ofstruct, OF_READWRITE);
+    //make file
+    OFSTRUCT ofstruct{};
+    auto result = std::unique_ptr<std::remove_pointer_t<HANDLE>, decltype(&CloseHandle)>(
+        (HANDLE)(OpenFile(
+            "output.txt",
+            &ofstruct,
+            OF_READWRITE | OF_CREATE
+        )), &CloseHandle
+    );
 
-    while (true)
+    if (reinterpret_cast<HFILE>(result.get()) != HFILE_ERROR)
     {
-        Sleep(1000);
-        char aString[] = "Hello world!\n";
-        WriteFile((HANDLE)result, aString, sizeof(aString), NULL, NULL);
+        // we can enable it after we open the file
+        hook::enable(&WriteFile);
+
+        //write to file
+        const char aString[] = "Hello world!\n";
+        WriteFile(result.get(), aString, sizeof(aString), NULL, NULL);
     }
 }
 

shithook.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29519.181
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "shithook", "shithook.vcxproj", "{E5255EE2-A83E-4455-99E3-B5D236B76D36}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Debug|x64.ActiveCfg = Debug|x64
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Debug|x64.Build.0 = Debug|x64
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Debug|x86.ActiveCfg = Debug|Win32
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Debug|x86.Build.0 = Debug|Win32
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Release|x64.ActiveCfg = Release|x64
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Release|x64.Build.0 = Release|x64
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Release|x86.ActiveCfg = Release|Win32
+		{E5255EE2-A83E-4455-99E3-B5D236B76D36}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8D42E5D0-475A-4EA5-94EA-1ADB1F46CBF1}
+	EndGlobalSection
+EndGlobal

shithook.vcxproj

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="main.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="hook.hpp" />
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>16.0</VCProjectVersion>
+    <ProjectGuid>{E5255EE2-A83E-4455-99E3-B5D236B76D36}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>shithook</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+    <SpectreMitigation>false</SpectreMitigation>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+    <SpectreMitigation>false</SpectreMitigation>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+    <SpectreMitigation>false</SpectreMitigation>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+    <SpectreMitigation>false</SpectreMitigation>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+    <OutDir>$(SolutionDir)$(Configuration)\</OutDir>
+    <IntDir>$(Configuration)\</IntDir>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+    <OutDir>$(SolutionDir)$(Configuration)\</OutDir>
+    <IntDir>$(Configuration)\</IntDir>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

shithook.vcxproj.filters

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="main.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="hook.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>

shithook.vcxproj.user

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>