libmem: A C repository from rdbo

Advanced Game Hacking Library (C/C++/Rust/Python) (Windows/Linux/FreeBSD)

Made by rdbo

Discord Server

https://discord.com/invite/Qw8jsPD99X

License

This project is licensed under the GNU AGPLv3.0 (no later versions)

Read LICENSE for more information

NOTE: Submodules and external dependencies might have their own licenses! Check for their licenses as well.

Platforms

OS	x86	x64	ARM	Aarch64
Windows	✅	✅	⚠️	⚠️
Linux	✅	✅	⚠️	⚠️
FreeBSD	✔️	✔️	⚠️	⚠️

Status	Description
✅	100% working
✔️	Mostly working
⚠️	Untested

Features

And much more!

Examples

Modern C++

/* C++20 or higher */
#include <libmem/libmem.hpp>
#include <iostream>

using namespace libmem;

int main()
{
	Address disas_addr = reinterpret_cast<Address>(main);

	// Disassemble function 'main' until a 'ret' is found
	for (;;) {
		auto inst = Disassemble(disas_addr).value();
		std::cout << inst.to_string() << std::endl;
		if (inst.mnemonic == "ret")
			break;
		disas_addr += inst.bytes.size();
	}

	return 0;
}

/*
Output:
0x55b1a3259275: push rbp -> [ 55 ]
0x55b1a3259276: mov rbp, rsp -> [ 48 89 e5 ]
...
0x55b1a325941a: leave  -> [ c9 ]
0x55b1a325941b: ret  -> [ c3 ]
*/

C/C++

#include <libmem/libmem.h>

void hk_take_damage(int amount)
{
  printf("hooked take_damage! no damage will be taken\n");
  return;
}

int main()
{
	lm_module_t game_mod;
	lm_address_t fn_take_damage;

	LM_FindModule("game.dll", &game_mod);
	printf("[*] Base address of 'game.dll': %p\n", game_mod.base);

	fn_take_damage = LM_FindSymbolAddress(&game_mod, "take_damage");
	printf("[*] Found 'take_damage' function: %p\n", fn_take_damage);

	LM_HookCode(fn_take_damage, hk_take_damage, LM_NULLPTR);
	printf("[*] 'take_damage' hooked, player will no longer receive damage\n");

	return 0;
}

Rust

use libmem::*;

fn godmode() -> Option<()> {
    let game_process = find_process("game_linux64")?;
    let client_module = find_module_ex(&game_process, "libclient.so")?;

    let fn_update_health = sig_scan_ex(
        &game_process,
        "55 48 89 E5 66 B8 ?? ?? 48 8B 5D FC",
        client_module.base,
        client_module.size,
    )?;
    println!(
        "[*] Signature scan result for 'update_health' function: {}",
        fn_update_health
    );

    let shellcode = assemble_ex("mov rbx, 1337; mov [rdi], rbx; ret", Arch::X64, 0)?;
    write_memory_ex(&game_process, fn_update_health + 8, &shellcode.as_slice())?;
    println!("[*] Patched 'update_health' function to always set health to 1337!");

    Some(())
}

fn main() {
    godmode();
}

Python

from libmem import *
import time

process = find_process("game.exe")
game_mod = find_module_ex(process, process.name)

# Resolve a Cheat Engine pointer scan
health_pointer = deep_pointer_ex(process, game_mod.base + 0xdeadbeef, [0xA0, 0x04, 0x10, 0xF0, 0x0])

# Set player health to 1337 forever
while True:
    write_memory_ex(process, health_pointer, bytearray(int(1337).to_bytes(4)))
    time.sleep(0.2)

Documentation

The main documentation for libmem can be found in include/libmem.h. All APIs are documented and contain very descriptive information about each function, their parameters and return value. They are located in nearby comments, so you should be able to see them by hovering on your text editor/IDE.

Similarly, the bindings documentation is embedded with their packages, so your text editor/IDE should be able to access the documentation for each API.

Unnoficial Bindings

These bindings are done by the community/third-parties and are not affiliated with the libmem project or its author.

Their code can have their own licenses as well, diverging from libmem's.

CMake Usage (without installing)

Add the following commands to your CMakeLists.txt.

They will fetch libmem-config.cmake from the root of this repository, which will download libmem binaries for your system and include libmem in your CMake project.

include(FetchContent)

# Download and set up libmem
FetchContent_Declare(libmem-config URL "https://raw.githubusercontent.com/rdbo/libmem/config-v1/libmem-config.cmake" DOWNLOAD_NO_EXTRACT TRUE)
FetchContent_MakeAvailable(libmem-config)
set(CMAKE_PREFIX_PATH "${libmem-config_SOURCE_DIR}" "${CMAKE_PREFIX_PATH}")
set(LIBMEM_DOWNLOAD_VERSION "5.0.2")

# Find libmem package
find_package(libmem CONFIG REQUIRED)

Use the following to link against libmem (NOTE: it might be necessary to link against other dependencies - go to the Dependencies section for more information):

# Link against libmem
target_link_libraries(<YOUR_TARGET_NAME> PRIVATE libmem::libmem)

Installing

Windows

Note: If you download a binary version of libmem in the GitHub releases, you only need to install the Windows SDK. Building is not necessary, just add libmem/include to your project's include directories and link it against the binary you downloaded.

Install the Windows SDK: Windows 7 - Windows 10/11
Install Python 3 (Check the option to add Python to PATH) (Use Python 3.8.9 for Windows 7)
Install Visual Studio 2022 or newer (with C++ support and CMake) (older versions might work, but they were not tested). NOTE: You can install only the Visual Studio Build Tools if you don't want the whole IDE.
Install Git Bash
Run a Visual Studio Developer Command Prompt (or x64 Native Tools Command Prompt for VS 2022 for 64 bits) as Administrator
Run the following command to append libmem's destination directory to your %PATH% user variable (WARNING - watch for your %PATH% size limit!):
```
 setx PATH "%PATH%;%ProgramFiles%\libmem\include;%ProgramFiles%\libmem\lib"
```
Continue reading at Build and Install

Linux

Note: The following commands are for Debian/Ubuntu based distributions. Make sure to find the appropriate commands for your Linux distribution.

Open a terminal
Install GCC, G++, Git, CMake, Make, Python 3, and the Linux headers:
```
 sudo apt install gcc g++ git cmake make python3 linux-headers
```
Continue reading at Build and Install

FreeBSD

Add a mountpoint for the procfs filesystem in your /etc/fstab by appending the following line:
```
 proc		/proc		procfs	rw	0	0
```
Manually mount the procfs. This will only be necessary if you don't reboot. If you reboot, it will be automatically mounted because of the line at /etc/fstab. Run the following command (as root):
```
 mount -t procfs proc /proc
```
Install Git, CMake and Python3 (run as root) (clang, clang++ and make should already be installed):
```
 pkg install git cmake python3
```
Continue reading at Build and Install

Build and Install

Note: Run the following commands on Git Bash (Windows) or a terminal (Linux/FreeBSD).

Clone the repository:

git clone --recursive --depth 1 https://github.com/rdbo/libmem

Generate the CMake cache:

mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release

Compile libmem:

Windows: nmake

Unix-like: make -j 4

Install libmem (run as root or as Administrator):

Windows: nmake install

Unix-like: make install

After installing, follow the the proper Usage section for your programming language

Usage (C/C++)

Add #include <libmem/libmem.h> (C/C++) or #include <libmem/libmem.hpp> (C++) to your source code. Link the generated libmem library against your binary (liblibmem.so for Unix-like or libmem.dll for Windows). For GCC-like compilers: add the flag -llibmem to your compiler and it should link it.

#include <libmem/libmem.h> /* C/C++ */
#include <libmem/libmem.hpp> /* Force C++ */

Usage (Rust)

NOTE: You no longer have to install libmem to use with Rust, as long as the fetch feature is enabled on the libmem crate (default). If you disable that feature, it will look for libmem in your system, and you can make the libmem path explicit by using the environment var LIBMEM_DIR=<path to libmem's directory>.

Add the following line to your Cargo.toml under [dependencies]:

libmem = "5"

Import libmem in your Rust source code:

use libmem::*;

Usage (Python)

NOTE: You no longer have to install libmem to use with Python. If no installation is found, the package will fetch and link libmem for you seamlessly. You can use the LIBDIR=<path to libmem's directory> environment variable to tell the libmem package where to look for your installation (if you installed it).

Make sure to have Python >= 3.6 active
Either install the libmem package from PyPi by running the following command:

pip install --upgrade libmem

Or build and install it yourself by running the following commands:

cd libmem-py
python configure.py
python setup.py install

Now to import libmem, just do the following in your Python code:

from libmem import *

Dependencies

All:

capstone (included in root project)
keystone (included in root project)
LIEF (included in root project)
libstdc++ (used in keystone, LIEF and LLVM)
libmath (used in keystone)

Windows:

Windows SDK (user32.lib, psapi.lib, ntdll.lib, shell32.lib)

Linux/Android:

libdl (-ldl)

BSD:

libdl (-ldl)
libkvm (-lkvm)
libprocstat (-lprocstat)
libelf (-lelf)

API Overview

LM_EnumProcesses
LM_GetProcess
LM_GetProcessEx
LM_FindProcess
LM_IsProcessAlive
LM_GetBits
LM_GetSystemBits

LM_EnumThreads
LM_EnumThreadsEx
LM_GetThread
LM_GetThreadEx
LM_GetThreadProcess

LM_EnumModules
LM_EnumModulesEx
LM_FindModule
LM_FindModuleEx
LM_LoadModule
LM_LoadModuleEx
LM_UnloadModule
LM_UnloadModuleEx

LM_EnumSymbols
LM_FindSymbolAddress
LM_DemangleSymbol
LM_FreeDemangledSymbol
LM_EnumSymbolsDemangled
LM_FindSymbolAddressDemangled

LM_EnumSegments
LM_EnumSegmentsEx
LM_FindSegment
LM_FindSegmentEx

LM_ReadMemory
LM_ReadMemoryEx
LM_WriteMemory
LM_WriteMemoryEx
LM_SetMemory
LM_SetMemoryEx
LM_ProtMemory
LM_ProtMemoryEx
LM_AllocMemory
LM_AllocMemoryEx
LM_FreeMemory
LM_FreeMemoryEx
LM_DeepPointer
LM_DeepPointerEx

LM_DataScan
LM_DataScanEx
LM_PatternScan
LM_PatternScanEx
LM_SigScan
LM_SigScanEx

LM_GetArchitecture
LM_Assemble
LM_AssembleEx
LM_FreePayload
LM_Disassemble
LM_DisassembleEx
LM_FreeInstructions
LM_CodeLength
LM_CodeLengthEx

LM_HookCode
LM_HookCodeEx
LM_UnhookCode
LM_UnhookCodeEx

LM_VmtNew
LM_VmtHook
LM_VmtUnhook
LM_VmtGetOriginal
LM_VmtReset
LM_VmtFree

Contributing

Read the file CONTRIBUTING.md in the root directory of this repository

Projects

Made with libmem: