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Mac std attach Module
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@AlexKnauth
AlexKnauth committed Dec 9, 2023
1 parent 0415420 commit a420667
Showing 1 changed file with 110 additions and 45 deletions.
155 changes: 110 additions & 45 deletions src/game_engine/unity/mono.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,14 +9,20 @@ use crate::{
string::ArrayCString,
Address, Address32, Address64, Error, Process,
};
#[cfg(feature = "std")]
use crate::file_format::macho;
use core::{cell::OnceCell, iter};

#[cfg(all(debug_assertions, feature = "alloc"))]
use alloc::collections::BTreeSet;
#[cfg(feature = "std")]
use alloc::vec::Vec;
use arrayvec::{ArrayString, ArrayVec};
#[cfg(feature = "derive")]
pub use asr_derive::MonoClass as Class;
use bytemuck::CheckedBitPattern;
#[cfg(feature = "std")]
use std::{path::Path, fs::File, io, io::Read};

const CSTR: usize = 128;

Expand All @@ -43,39 +49,75 @@ impl Module {
/// correct for this function to work. If you don't know the version in
/// advance, use [`attach_auto_detect`](Self::attach_auto_detect) instead.
pub fn attach(process: &Process, version: Version) -> Option<Self> {
let module = ["mono.dll", "mono-2.0-bdwgc.dll"]
.iter()
.find_map(|&name| process.get_module_address(name).ok())?;

let is_64_bit = pe::MachineType::read(process, module)? == pe::MachineType::X86_64;
let offsets = Offsets::new(version, is_64_bit, BinaryFormat::PE);

let root_domain_function_address = pe::symbols(process, module)
.find(|symbol| {
symbol
.get_name::<25>(process)
.is_ok_and(|name| name.matches("mono_assembly_foreach"))
})?
.address;
#[allow(unused)]
let (module_name, module_range, format) = [
("mono.dll", BinaryFormat::PE),
("mono-2.0-bdwgc.dll", BinaryFormat::PE),
#[cfg(feature = "std")]
("libmono.0.dylib", BinaryFormat::MachO),
#[cfg(feature = "std")]
("libmonobdwgc-2.0.dylib", BinaryFormat::MachO)
].into_iter()
.find_map(|(name, format)| Some((name, process.get_module_range(name).ok()?, format)))?;

let module = module_range.0;

let is_64_bit = match format {
BinaryFormat::PE => pe::MachineType::read(process, module)? == pe::MachineType::X86_64,
#[cfg(feature = "std")]
BinaryFormat::MachO => macho::is_64_bit(process, macho::scan_macho_page(process, module_range)?)?,
};
let offsets = Offsets::new(version, is_64_bit, format);

let mono_assembly_foreach_address = match format {
BinaryFormat::PE => {
pe::symbols(process, module)
.find(|symbol| {
symbol
.get_name::<25>(process)
.is_ok_and(|name| name.matches("mono_assembly_foreach"))
})?
.address
},
#[cfg(feature = "std")]
BinaryFormat::MachO => {
let mono_module_path = process.get_module_path(module_name).ok()?;
let mono_module_bytes = file_read_all_bytes(mono_module_path).ok()?;
macho::get_function_address(process, module_range, &mono_module_bytes, b"_mono_assembly_foreach")?
}
};

let assemblies_pointer: Address = match is_64_bit {
true => {
const SIG_MONO_64: Signature<3> = Signature::new("48 8B 0D");
let scan_address: Address = SIG_MONO_64
.scan_process_range(process, (root_domain_function_address, 0x100))?
let assemblies_pointer: Address = match (is_64_bit, format) {
(true, BinaryFormat::PE) => {
const SIG_MONO_64_PE: Signature<3> = Signature::new("48 8B 0D");
let scan_address: Address = SIG_MONO_64_PE
.scan_process_range(process, (mono_assembly_foreach_address, 0x100))?
+ 3;
scan_address + 0x4 + process.read::<i32>(scan_address).ok()?
}
false => {
},
#[cfg(feature = "std")]
(true, BinaryFormat::MachO) => {
const SIG_MONO_64_MACHO: Signature<3> = Signature::new("48 8B 3D");
// RIP-relative addressing
// 3 is the offset to the next thing after the signature
let scan_address = SIG_MONO_64_MACHO.scan_process_range(process, (mono_assembly_foreach_address, 0x100))? + 3;
// 4 is the offset to the next instruction after relative
scan_address + 0x4 + process.read::<i32>(scan_address).ok()?
},
(false, BinaryFormat::PE) => {
const SIG_32_1: Signature<2> = Signature::new("FF 35");
const SIG_32_2: Signature<2> = Signature::new("8B 0D");

let ptr = [SIG_32_1, SIG_32_2].iter().find_map(|sig| {
sig.scan_process_range(process, (root_domain_function_address, 0x100))
sig.scan_process_range(process, (mono_assembly_foreach_address, 0x100))
})? + 2;

process.read::<Address32>(ptr + 2).ok()?.into()
}
},
#[cfg(feature = "std")]
(false, BinaryFormat::MachO) => {
return None;
},
};

let assemblies: Address = match is_64_bit {
Expand Down Expand Up @@ -893,45 +935,68 @@ fn detect_version(process: &Process) -> Option<Version> {
if process.get_module_address("mono.dll").is_ok() {
return Some(Version::V1);
}
if process.get_module_address("libmono.0.dylib").is_ok() {
return Some(Version::V1);
}

let unity_module = {
let address = process.get_module_address("UnityPlayer.dll").ok()?;
let range = pe::read_size_of_image(process, address)? as u64;
(address, range)
};
let unity_module = [
("UnityPlayer.dll", BinaryFormat::PE),
#[cfg(feature = "std")]
("UnityPlayer.dylib", BinaryFormat::MachO)
].into_iter().find_map(|(name, format)| {
match format {
BinaryFormat::PE => {
let address = process.get_module_address(name).ok()?;
let range = pe::read_size_of_image(process, address)? as u64;
Some((address, range))
},
#[cfg(feature = "std")]
BinaryFormat::MachO => process.get_module_range(name).ok()
}
})?;

// null "202" wildcard "."
const SIG_202X: Signature<6> = Signature::new("00 32 30 32 ?? 2E");

let Some(addr) = SIG_202X.scan_process_range(process, unity_module) else {
return Some(Version::V2);
};

const ZERO: u8 = b'0';
const NINE: u8 = b'9';

let version_string = process.read::<[u8; 6]>(addr + 1).ok()?;

let (before, after) = version_string.split_at(version_string.iter().position(|&x| x == b'.')?);

let mut unity: u32 = 0;
for &val in before {
match val {
ZERO..=NINE => unity = unity * 10 + (val - ZERO) as u32,
_ => break,
}
}
let unity: u32 = ascii_read_u32(before);

let mut unity_minor: u32 = 0;
for &val in &after[1..] {
match val {
ZERO..=NINE => unity_minor = unity_minor * 10 + (val - ZERO) as u32,
_ => break,
}
}
let unity_minor: u32 = ascii_read_u32(&after[1..]);

Some(if (unity == 2021 && unity_minor >= 2) || (unity > 2021) {
Version::V3
} else {
Version::V2
})
}

fn ascii_read_u32(slice: &[u8]) -> u32 {
const ZERO: u8 = b'0';
const NINE: u8 = b'9';

let mut result: u32 = 0;
for &val in slice {
match val {
ZERO..=NINE => result = result * 10 + (val - ZERO) as u32,
_ => break,
}
}
result
}

// --------------------------------------------------------

#[cfg(feature = "std")]
fn file_read_all_bytes<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
let mut f = File::open(path)?;
let mut buffer: Vec<u8> = Vec::new();
f.read_to_end(&mut buffer)?;
Ok(buffer)
}

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